Battery cell, battery device, energy storage device and power utilization device

Abstract

The utility model discloses a battery monomer, a battery device, an energy storage device and a power utilization device. The battery cell includes a housing, an electrode assembly, a conductive member, an electrode terminal, and a first insulator. The housing has a first wall. The electrode assembly is arranged in the shell. The conductive member is disposed on a side of the first wall away from the electrode assembly. The electrode terminal is connected with the conductive piece, and the electrode terminal is electrically connected with the electrode assembly. The first insulating part comprises a bottom wall and a peripheral wall, the bottom wall is arranged between the first wall and the conductive part, and at least part of the peripheral wall surrounds the periphery of the conductive part. The first insulating part further comprises an extending part, and the extending part is arranged on the outer peripheral face of the peripheral wall in a protruding mode. According to the technical scheme provided by the invention, the reliability of the battery device can be effectively improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a battery cell, a battery device, an energy storage device, and an electrical device. Background Technology

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0003] In the development of battery technology, how to improve the reliability of battery devices is a technical problem that urgently needs to be solved. Utility Model Content

[0004] This application provides a battery cell, a battery device, an energy storage device, and an electrical device. The technical solution provided by this application can effectively improve the reliability of the battery device.

[0005] This application is achieved through the following technical solution:

[0006] In a first aspect, some embodiments of this application provide a battery cell, which includes a casing, an electrode assembly, a conductive element, electrode terminals, and a first insulating element. The casing has a first wall. The electrode assembly is disposed within the casing. The conductive element is disposed on the side of the first wall opposite to the electrode assembly. The electrode terminals are connected to the conductive element and are electrically connected to the electrode assembly. The first insulating element includes a bottom wall and a peripheral wall, the bottom wall being disposed between the first wall and the conductive element, and at least a portion of the peripheral wall surrounding the outer periphery of the conductive element. The first insulating element further includes an extension protruding from the outer peripheral surface of the peripheral wall.

[0007] In the above solution, by providing an extension protruding from the outer peripheral surface of the first insulating member's peripheral wall, the creepage distance between the conductive member and the first wall can be effectively increased, reducing the risk of short circuits in individual battery cells caused by contact between the conductive member and the first wall. Furthermore, at the battery device level, the risk of short circuits between adjacent battery cells caused by the conductive member contacting the first wall becoming charged can be reduced. In particular, in battery devices with large-capacity battery cells, the extension effectively reduces the risk of short circuits caused by contact between the conductive member and the first wall, thus improving the reliability of the battery device.

[0008] According to some embodiments of this application, the extension is disposed around the peripheral wall.

[0009] In the above scheme, the extension is provided around the outer periphery of the peripheral wall, which can increase the creepage distance between any part of the conductive component in the circumferential direction and the first wall, reduce the risk of short circuit of the battery cell caused by the contact between the conductive component and the first wall, and thus cause thermal runaway of the battery cell, thereby making the battery cell highly reliable and thus making the battery device highly reliable.

[0010] According to some embodiments of this application, along the direction of the electrode assembly pointing towards the first wall, the end of the peripheral wall away from the bottom wall protrudes from the extension.

[0011] In the above solution, by setting the peripheral wall to protrude from the extension, on the one hand, the peripheral wall can effectively cover the outer periphery of the conductive component, thereby increasing the creepage distance between the conductive component and the first wall; on the other hand, it can reduce the material used in the extension, thereby reducing the material cost of the first insulating component and increasing the energy density of the battery cell.

[0012] According to some embodiments of this application, along the thickness direction of the first wall, the side of the extension facing the first wall is in contact with the first wall.

[0013] In the above solution, by setting the extension to contact the first wall, the contact area between the first insulating member and the first wall can be increased, thereby increasing the assembly strength between the first insulating member and the first wall, reducing the risk of separation between the first insulating member and the first wall, thus making the battery cell highly reliable, and consequently making the battery device highly reliable.

[0014] According to some embodiments of this application, a groove is formed on the side of the first wall opposite to the electrode assembly along the thickness direction of the first wall, the bottom wall is located in the groove, and the extension is located outside the groove.

[0015] In the above solution, by setting a groove on the outer side of the first wall and setting the bottom wall of the first insulating member in the groove and the extension part in the groove, the positioning accuracy between the first insulating member and the first wall can be effectively improved, the assembly difficulty of the first insulating member can be reduced, thereby improving the manufacturing efficiency of battery cells and thus improving the manufacturing efficiency of battery devices.

[0016] According to some embodiments of this application, the extension completely covers the side of the first wall opposite to the electrode assembly.

[0017] In the above solution, by setting the extension to completely cover the outside of the first wall, the conductive component and the first wall can be effectively insulated and isolated, further reducing the risk of short circuit of the battery cell caused by the conductive component and the first wall overlapping each other, thereby effectively improving the reliability of the battery cell and thus effectively improving the reliability of the battery device.

[0018] According to some embodiments of this application, the thickness of the extension is h along the thickness direction of the first wall, satisfying 0.2mm≤h≤1.5mm.

[0019] In the above scheme, by setting the thickness of the extension to not less than 0.2mm, the insulation performance of the extension can be guaranteed to a certain extent, reducing the risk of short circuit of the battery cell caused by electrical connection between the conductive component and the first wall, thus making the battery device highly reliable; by setting the thickness of the extension to not more than 1.5mm, the risk of the battery cell volume energy density being reduced due to the extension occupying the space of the battery cell along the first direction because it is too thick can be reduced.

[0020] According to some embodiments of this application, the following condition is met: 0.5mm ≤ h ≤ 1mm.

[0021] In the above scheme, by setting the thickness of the extension to not less than 0.5mm, the insulation performance of the extension can be effectively improved, the risk of short circuit of the battery cell caused by electrical connection between the conductive part and the first wall can be reduced, and the reliability of the battery device can be high. By setting the thickness of the extension to not more than 1mm, the risk of the battery cell volume energy density being reduced due to the extension occupying the space of the battery cell along the first direction because it is too thick can be effectively reduced.

[0022] According to some embodiments of this application, the extension protrudes beyond the outer peripheral surface of the peripheral wall by a dimension t, satisfying 0.5mm≤t≤5mm.

[0023] In the above solution, by setting the protrusion of the extension relative to the peripheral wall to not less than 0.5mm, the creepage distance between the conductive component and the first wall can be effectively increased, reducing the risk of short circuit of the battery cell caused by the contact between the conductive component and the first wall; by setting the protrusion of the extension relative to the peripheral wall to not more than 5mm, the risk of interference with other structural components or occupation of space required by other structural components due to the excessive size of the extension can be reduced, making the battery cell structure compact and the battery device structure compact.

[0024] According to some embodiments of this application, 2mm≤t≤3.5mm is satisfied.

[0025] In the above solution, by setting the protrusion of the extension relative to the peripheral wall to not less than 2mm, the creepage distance between the conductive component and the first wall can be further increased, effectively reducing the risk of short circuit of the battery cell caused by the contact between the conductive component and the first wall; by setting the protrusion of the extension relative to the peripheral wall to not more than 3.5mm, the risk of interference with other structural components or occupation of space required by other structural components due to the excessive size of the extension can be effectively reduced, making the battery cell structure compact and the battery device structure compact.

[0026] According to some embodiments of this application, the peripheral wall and the extension are integrally formed; or, the peripheral wall and the extension are separate structures, and the peripheral wall and the extension are connected to each other.

[0027] In the above scheme, the peripheral wall and the extension are integrally formed, resulting in high structural strength for both the extension and the peripheral wall. This reduces the risk of the extension separating from the peripheral wall, which would decrease the creepage distance between the conductive component and the first wall, thus affecting the reliability of the battery cell. Alternatively, the peripheral wall and the extension can be separate structures connected to each other, which can reduce the mold cost of the first insulating component and facilitate the control of battery cell manufacturing costs.

[0028] According to some embodiments of this application, the battery cell further includes a second insulating member, at least a portion of which is disposed on the side of the first wall opposite to the electrode assembly and at least partially covers the first wall.

[0029] In the above solution, by covering the outside of the first wall with a second insulating component, the insulation performance of the battery cell can be improved, reducing the risk of short circuit of the battery cell caused by the overlap of external structural components; on the other hand, it can play a protective role, reducing the risk of damage to the first wall by external materials.

[0030] According to some embodiments of this application, the second insulating member has a first through hole through which a conductive member passes.

[0031] In the above solution, by providing a first through hole on the second insulating component, interference between the second insulating component and the conductive component can be avoided, thus preventing the conductive component from affecting the electrical connection between the conductive component and the external busbar component.

[0032] According to some embodiments of this application, along the thickness direction of the first wall, a portion of the second insulating member and an extension are stacked on top of each other, with the extension located between the second insulating member and the first wall.

[0033] In the above solution, by placing the extension between the second insulating member and the first wall, the connection strength between the second insulating member and the first wall can be improved, reducing the risk of the second insulating member detaching from the first wall. On the other hand, with the abutment of the second insulating member, the extension can be stably placed on the outside of the first wall, which increases the creepage distance between the conductive member and the first wall, thus improving the reliability of the battery cell and consequently the reliability of the battery device.

[0034] According to some embodiments of this application, on the same projection plane perpendicular to the thickness direction of the first wall, the orthographic projection of the second insulating member and the orthographic projection of the extension have an overlapping area, the width of the overlapping area being c, which satisfies 0.5mm≤c≤5mm.

[0035] In the above scheme, by setting the width of the overlapping area between the second insulating member and the extension to not less than 0.5 mm, the connection strength between the second insulating member, the extension and the first wall can be effectively improved, the risk of separation of the three can be reduced, and the reliability of the battery cell can be high. By setting the width of the overlapping area between the second insulating member and the extension to not more than 5 mm, the risk of interference with other structural members or occupation of space required by other structural members due to the excessive size of the extension can be reduced, making the battery cell structure compact and the battery device structure compact.

[0036] According to some embodiments of this application, the outer casing is a steel casing.

[0037] In the above scheme, by setting the outer shell as a steel shell, the wall thickness of the outer shell can be designed to be thin, which is conducive to improving the volumetric energy density of the battery cell, and thus to improving the volumetric energy density of the battery device.

[0038] According to some embodiments of this application, the outer shell is a square shell, the dimension of the outer shell in the first direction is W1, the dimension of the outer shell in the second direction is T1, and the dimension of the outer shell in the thickness direction of the first wall is H1, satisfying that 3720cm3≤W1*T1*H1≤12500cm3, 60mm≤T1≤150mm, 120mm≤H1≤400mm, 200mm≤W1≤1500mm, and the first direction, the second direction and the thickness direction of the first wall are mutually perpendicular.

[0039] In the above scheme, by limiting the external contour dimensions of the battery cell, the internal space of the battery cell is made larger to accommodate more electrochemical substances, thus forming a battery cell with a larger capacity. For battery cells with a larger capacity, an extension is provided on the peripheral wall of the first insulating member, which can effectively increase the creepage distance between the conductive member and the first wall, resulting in high insulation performance of the battery cell and reducing the risk of short circuit. This makes the battery cell with a larger capacity more reliable, and consequently, the battery device with such a battery cell has high energy storage reliability or high discharge reliability.

[0040] Secondly, some embodiments of this application provide a battery device, which includes the battery cell provided in the first aspect.

[0041] Thirdly, some embodiments of this application provide an energy storage device, which includes a battery cell provided in the first aspect and / or a battery device provided in the second aspect.

[0042] Fourthly, some embodiments of this application provide an electrical device, which includes a battery cell provided in the first aspect and / or a battery device provided in the second aspect.

[0043] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0044] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0045] Figure 1 This is a schematic diagram of a vehicle in some embodiments of this application;

[0046] Figure 2 This is a schematic diagram of an energy storage device in some embodiments of this application;

[0047] Figure 3 This is an exploded perspective view of the battery device in some embodiments of this application;

[0048] Figure 4 These are perspective views of individual battery cells in some embodiments of this application;

[0049] Figure 5 This is a top view of a battery cell in some embodiments of this application;

[0050] Figure 6 for Figure 5 Sectional view along the AA direction;

[0051] Figure 7 for Figure 6 Enlarged view of point B in the middle;

[0052] Figure 8 This is an exploded perspective view of the conductive element, the first insulating element, and the electrode terminals in some embodiments of this application;

[0053] Figure 9 This is a perspective view of the first insulating element in some embodiments of this application;

[0054] Figure 10 This is a perspective view of a battery cell in some embodiments of this application.

[0055] Icons: 1000 - Electrical device; 100 - Battery device; 200 - Controller; 300 - Motor; 2000 - Energy storage device; 2001 - Cabinet; 10 - Battery cell; 20 - Box; 21 - First box body; 22 - Second box body; 11 - Outer shell; 110 - Housing; 111 - First wall; 1111 - Groove; 12 - Electrode assembly; 13 - Conductive component; 14 - Electrode terminal; 15 - First insulating component; 150 - Bottom wall; 1500 - Perforation; 151 - Peripheral wall; 152 - Extension; 16 - Second insulating component; 160 - First through hole; 17 - Adapter; x - First direction; y - Second direction; z - Thickness direction of the first wall. Detailed Implementation

[0056] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0057] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application 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 description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0058] In this application, the reference to "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 in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0059] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0060] 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, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0061] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0062] In this application, "multiple" means two or more (including two).

[0063] 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.

[0064] 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.

[0065] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, helps prevent short circuits to some extent while allowing active ions to pass through.

[0066] 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.

[0067] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0068] In some embodiments, the positive electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloys, etc. When foamed metal is used as the positive electrode, the surface of the foamed metal may or may not contain a positive electrode active material. As an example, lithium source material, potassium metal, or sodium metal can also be filled and / or deposited within the foamed metal, where the lithium source material is lithium metal and / or a lithium-rich material.

[0069] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0070] As an example, the negative electrode current collector can be a metal foil, a foamed metal, or a composite current collector. For example, as a metal foil, it can be silver-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, nickel, or titanium, etc. Foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can 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.).

[0071] As an example, the negative electrode sheet 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.

[0072] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0073] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0074] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0075] In some embodiments, the separator is a separator membrane. The separator membrane can be of various types, and any known porous separator membrane with good chemical and mechanical stability can be selected.

[0076] As an example, the material of the separator may include at least one of glass fiber, nonwoven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator may be a single-layer film or a multi-layer composite film. When the separator is a multi-layer composite film, the materials of each layer may be the same or different. The separator may be a separate component located between the positive and negative electrodes, or it may be attached to the surfaces of the positive and negative electrodes.

[0077] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0078] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The electrolyte can be liquid, gel-like, or solid. Liquid electrolytes include electrolyte salts and solvents.

[0079] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0080] As an example, polymer solid electrolytes can be polyether (polyoxyethylene), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymers, polyionic liquids-lithium salts, cellulose, etc.

[0081] As an example, inorganic solid electrolytes may include one or more of the following: oxide solid electrolytes (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film), sulfide solid electrolytes (crystalline lithium superconducting ion conductor (lithium germanium phosphate sulfide, silver sulfide germanium ore), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0082] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0083] In some implementations, the electrode assembly has a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0084] In some implementations, the electrode assembly has a stacked structure.

[0085] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0086] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0087] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0088] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0089] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0090] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0091] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0092] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0093] As an example, a battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include, but are not limited to, square battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries.

[0094] The battery apparatus 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 connected in series, parallel, or mixed connections via a busbar.

[0095] 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 together to form a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0096] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0097] 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.

[0098] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0099] As an example, the enclosure may include a first enclosure body and a second enclosure body. The first enclosure body and the second enclosure body are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, which can be either sealed or unsealed. The first enclosure body may be a top cover or a bottom plate.

[0100] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0101] As an example, the housing can be part of the vehicle's chassis structure. For instance, the housing's roof can be at least part of the vehicle's floor, or the housing's frame can be at least part of the vehicle's crossbeams and longitudinal beams.

[0102] In some embodiments, the energy storage device includes a cabinet, with a door on at least one side. The energy storage device includes energy storage containers, energy storage cabinets, etc. In some embodiments, one or more energy storage devices may constitute at least a portion of an energy storage system.

[0103] Battery devices possess outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide applicability, and low self-discharge coefficient, making them an important component of today's new energy development. The development of battery technology must simultaneously consider multiple design factors, such as performance parameters like energy density, cycle life, and discharge capacity. Furthermore, the charge and discharge performance of the battery device must also be taken into account.

[0104] Generally, a battery cell includes a casing, electrode assembly, conductive element, electrode terminals, and a first insulating element. The conductive element is disposed on the outer side of the casing wall and electrically connected to the electrode assembly through the electrode terminals to realize the input and output of electrical energy. The first insulating element is disposed between the conductive element and the first wall to insulate and isolate the conductive element and the first wall, reducing the risk of short circuit in the battery cell caused by short circuit between the conductive element and the casing. However, in related technologies, especially in high-capacity battery cells, the first insulating element cannot effectively insulate and isolate the conductive element and the first wall. The creepage distance between the conductive element and the first wall is too small, and there is still a risk of short circuit in the battery cell due to contact between the conductive element and the first wall, thereby affecting the reliability of the battery cell and, consequently, the reliability of the battery device.

[0105] In view of this, to improve the problem of insufficient creepage distance between the conductive element and the first wall, which easily leads to overlap between the conductive element and the first wall and reduces the reliability of the battery device, some embodiments of this application provide a battery cell. The battery cell includes a casing, an electrode assembly, a conductive element, electrode terminals, and a first insulating element. The casing has a first wall. The electrode assembly is disposed inside the casing. The conductive element is disposed on the side of the first wall opposite to the electrode assembly. The electrode terminals are connected to the conductive element and electrically connected to the electrode assembly. The first insulating element includes a bottom wall and a peripheral wall. The bottom wall is disposed between the first wall and the conductive element, and at least a portion of the peripheral wall surrounds the outer periphery of the conductive element. The first insulating element also includes an extension that protrudes from the outer peripheral surface of the peripheral wall.

[0106] In the above solution, by providing an extension protruding from the peripheral wall of the first insulating member, the creepage distance between the conductive member and the first wall can be effectively increased, reducing the risk of internal short circuits in the battery cell caused by the conductive member contacting the first wall. Furthermore, at the battery device level, the risk of the casing becoming charged due to the contact between the conductive member and the first wall, leading to short circuits between adjacent battery cells, can be reduced. In particular, in battery devices with large-capacity battery cells, the extension effectively reduces the risk of short circuits caused by the contact between the conductive member and the first wall, thus improving the reliability of the battery device.

[0107] The battery cells disclosed in this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft.

[0108] The technical solutions described in the embodiments of this application are applicable to batteries, energy storage devices using batteries, and electrical devices using batteries.

[0109] Energy storage devices may include energy storage containers, energy storage cabinets, etc. For example, an energy storage cabinet may include a cabinet and one or more battery cells and / or battery devices mounted on the cabinet.

[0110] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be new energy vehicles, including pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles; spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc.; electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc.; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. The electrical devices in the embodiments of this application include, but are not limited to, those mentioned above.

[0111] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.

[0112] Figure 1 This is a schematic diagram of a vehicle in some embodiments of this application.

[0113] The electrical device 1000 is a vehicle. The vehicle's interior may include a controller 200, a motor 300, and a battery device 100. The controller 200 controls the battery device 100 to supply power to the motor 300. For example, the battery device 100 can be located at the bottom, front, or rear of the vehicle. The battery device 100 can be used to power the vehicle; for example, it can serve as the vehicle's operating power source for its electrical system, such as for the power requirements of starting, navigation, and operation. In another embodiment of this application, the battery device 100 can not only serve as the vehicle's operating power source but also as its driving power source, replacing or partially replacing fuel or natural gas to provide driving power to the vehicle.

[0114] Please see Figure 2 , Figure 2 This is a schematic diagram of an energy storage device 2000 in some embodiments of this application.

[0115] The energy storage device 2000 can be an energy storage cabinet, which includes a cabinet body 2001 and multiple battery cells 10. The multiple battery cells 10 can be housed within the cabinet body 2001. The multiple battery cells 10 can be connected in series, parallel, or a combination thereof. Optionally, the energy storage cabinet includes a cabinet body 2001 and multiple battery devices 100. The multiple battery devices 100 can be housed within the cabinet body 2001. The multiple battery devices 100 can be connected in series, parallel, or a combination thereof.

[0116] Please refer to Figure 3 , Figure 3 This is an exploded perspective view of the battery device 100 in some embodiments of this application. The battery device 100 includes a housing 20 and battery cells 10, the battery cells 10 being housed within the housing 20.

[0117] The housing 20 provides assembly space for the battery cell 10, and can adopt various structures. In some embodiments, the housing 20 may include a first housing body 21 and a second housing body 22, which overlap each other, and together define an assembly space for accommodating the battery cell 10. The second housing body 22 may be a hollow structure open at one end, and the first housing body 21 may be a plate-like structure, with the first housing body 21 covering the open side of the second housing body 22 so that the first housing body 21 and the second housing body 22 together define the assembly space; alternatively, the first housing body 21 and the second housing body 22 may both be hollow structures open on one side, with the open side of the first housing body 21 covering the open side of the second housing body 22.

[0118] Of course, the box 20 formed by the first box body 21 and the second box body 22 can be of various shapes, such as cylinder, cuboid or cube.

[0119] In the battery device 100, there can be one or more battery cells 10 disposed within the housing 20. When there are multiple battery cells 10 disposed within the housing 20, they can be connected in series, in parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 10 are connected in both series and parallel configurations. Multiple battery cells 10 can be directly connected in series, in parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 10 is housed within the housing 20. Alternatively, the battery device 100 can also be composed of multiple battery cells 10 first connected in series, in parallel, or in a mixed configuration to form a battery module, and then the multiple battery modules are connected in series, in parallel, or in a mixed configuration to form a whole, which is then housed within the housing 20.

[0120] In some embodiments, the battery device 100 may also include other structures. For example, the battery device 100 may also include a busbar for connecting multiple battery cells 10 to achieve electrical connection between the multiple battery cells 10.

[0121] For example, the housing 20 is provided with a plurality of battery cell assemblies, each battery cell assembly including a plurality of battery cells 10 stacked on top of each other, and the plurality of battery cells 10 are connected in series. In some embodiments, the plurality of battery cell assemblies may be connected in series with each other.

[0122] Each battery cell 10 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 10 can be in the form of a cuboid, cylinder, prism, or other shapes.

[0123] Some embodiments of this application provide a single battery cell 10; please refer to [link to relevant documentation]. Figures 4-9 , Figure 4 This is a perspective view of a battery cell 10 in some embodiments of this application. Figure 5 This is a top view of a battery cell 10 in some embodiments of this application. Figure 6 for Figure 5 Sectional view in the middle AA direction. Figure 7 for Figure 6 Enlarged view at point B in the middle. Figure 8 This is an exploded perspective view of the conductive element 13, the first insulating element 15, and the electrode terminal 14 in some embodiments of this application. Figure 9 This is a perspective view of the first insulating member 15 in some embodiments of this application.

[0124] The battery cell 10 includes a housing 11, an electrode assembly 12, a conductive element 13, electrode terminals 14, and a first insulating element 15. The housing 11 has a first wall 111. The electrode assembly 12 is disposed within the housing 11. The conductive element 13 is disposed on the side of the first wall 111 opposite to the electrode assembly 12. The electrode terminals 14 are connected to the conductive element 13 and are electrically connected to the electrode assembly 12. The first insulating element 15 includes a bottom wall 150 and a peripheral wall 151. The bottom wall 150 is disposed between the first wall 111 and the conductive element 13, and at least a portion of the peripheral wall 151 surrounds the outer periphery of the conductive element 13. The first insulating element 15 also includes an extension 152 protruding from the outer peripheral surface of the peripheral wall 151.

[0125] The housing 11 is a component for housing the electrode assembly 12. The housing 11 can also be used to house an electrolyte, such as an electrolyte solution. See also... Figure 6 In some embodiments, the housing 11 includes a housing 110 and an end cap. The housing 110 has an internal cavity for accommodating the electrode assembly 12. The housing 110 has an opening communicating with the cavity. The end cap closes onto the opening of the housing 110 to form a sealed connection, thereby creating a sealed space for accommodating the electrode assembly 12 and the electrolyte. The end cap can be connected to the housing 110 by welding, bonding, snap-fitting, or other connection methods. Optionally, the housing 11 may further include a base plate. Openings are formed at both ends of the housing 110, one of which is closed by the end cap, and the other opening is closed by the base plate.

[0126] In some embodiments, the material of the housing 11 can be metal or a combination of metal and non-metal. For example, the housing 11 can be made of metal, such as aluminum, copper, iron, aluminum, steel or aluminum alloy. Alternatively, some parts of the housing 11 can be made of metal, while the rest can be made of non-metal. For example, the end cap of the housing 11 can be made of metal, while the shell 110 or other parts of the housing 11 can be made of non-metallic materials.

[0127] In some embodiments, the housing 11 may be a sealed structure or a non-sealed structure.

[0128] As an example, when the outer casing 11 is a non-sealed structure, it only serves to protect the electrode assembly 12. The battery cell 10 includes a sealant for encapsulating the electrode assembly 12 and other components such as the electrolyte. The outer casing 11 is disposed outside the sealant to protect the electrode assembly 12 or to limit the expansion of the electrode assembly 12. Specifically, the sealant can be a bag-shaped insulating material or an aluminum-plastic film, covering the outside of the electrode assembly 12 and serving to insulate the electrode assembly 12 and the outer casing 11.

[0129] In some embodiments, when assembling the battery cell 10, the electrode assembly 12 can be placed into the housing 110 first, and electrolyte can be filled into the housing 110. Then, the end cap can be closed onto the opening of the housing 110 to complete the assembly of the battery cell 10. Alternatively, in some embodiments, when assembling the battery cell 10, the electrode assembly 12 can be placed into the housing 110 first, and then the end cap can be closed onto the opening of the housing 110. Electrolyte can then be filled into the housing 110 through the injection hole on the end cap, and then the injection hole can be closed to complete the assembly of the battery cell 10.

[0130] The outer shell 11 can be of various shapes, such as a cylinder or a prism. The shape of the outer shell 11 can be determined according to the specific shape of the electrode assembly 12. For example, if the electrode assembly 12 is a cylindrical structure, then a cylindrical outer shell 11 can be selected. If the electrode assembly 12 is a flat structure, then the outer shell 11 can be square.

[0131] The first wall 111 is a partial structure of the outer casing 11. The first wall 111 can be used to support the conductive element 13, which can be connected to the busbar component to realize the input and output of electrical energy. The busbar component can be a bar. In some embodiments, the first wall 111 can be a part of the casing 110, such as the side wall or bottom plate of the casing 110. In some embodiments, the first wall 111 can be an end cap.

[0132] The electrode assembly 12 is a component in the battery cell 10 where electrochemical reactions occur. The structure of the electrode assembly 12 can be various. For example, the electrode assembly 12 includes an electrode and a separator. For example, the electrode assembly 12 can be a wound structure formed by winding a positive electrode, a separator and a negative electrode, or a stacked structure formed by arranging a positive electrode, a separator and a negative electrode in layers.

[0133] Generally, the electrode assembly 12 includes a main body and tabs, with the main body being the primary portion of the electrode assembly 12. In some embodiments, the positive electrode in the main body has a positive active material, and the negative electrode has a negative active material. The tabs are electrode structures extending from the main body; they may not include active material and are used for inputting or outputting the positive or negative electrode of the electrode assembly 12. The tabs are electrically connected to the electrode leads to achieve an electrical connection between the electrode assembly 12 and the electrode leads. The electrode leads are used to input and output electrical energy from the battery cell 10. In some embodiments, the tabs are located at one end of the electrode assembly 12 in the thickness direction z of the first wall, near the first wall 111.

[0134] In some embodiments, the electrode lead-out portion includes a conductive element 13 and an electrode terminal 14.

[0135] The conductive component 13 is a structural component disposed on the outside of the first wall 111. The side of the conductive component 13 away from the first wall 111 can be connected to the busbar component, thereby realizing the series, parallel or mixed connection between battery cells 10 at the battery device 100 level.

[0136] Electrode terminal 14 is a structural component that enables electrical connection between conductive element 13 and electrode assembly 12. Exemplarily, one end of electrode terminal 14 passes through first wall 111 and connects to conductive element 13, while the other end of electrode terminal 14 connects to electrode tab. The connection relationship between electrode terminal 14 and conductive element 13 is diverse, including but not limited to riveting, welding, threaded connection, or other connection methods. Exemplarily, conductive element 13 is riveted to first electrode terminal 14, conductive element 13 has a riveting hole, and the portion of electrode terminal 14 passing through first wall 111 is disposed in the riveting hole. Electrode terminal 14 and electrode tab can be directly connected or indirectly connected. Exemplarily, the end of electrode terminal 14 facing away from conductive element 13 is welded to electrode tab. Also exemplaryly, electrode terminal 14 is connected to electrode tab via adapter 17, one end of adapter 17 is welded to electrode terminal 14, and the other end of adapter 17 is welded to electrode tab.

[0137] In some embodiments, the conductive element 13 is made of a metallic material, such as aluminum, copper, iron, steel, alloy, or composite metal.

[0138] In some embodiments, the electrode terminal 14 is made of a metallic material, such as aluminum, copper, iron, steel, alloy, or composite metal.

[0139] Optionally, the material of the electrode terminal 14 and the conductive element 13 can be the same or different. For example, the electrode terminal 14 is made of aluminum, and the conductive element 13 is made of aluminum. Alternatively, the electrode terminal 14 is made of copper, and the conductive element 13 is made of aluminum.

[0140] The first insulating element 15 has insulating properties and is used to insulate and isolate the conductive element 13 and the first wall 111. See also... Figure 7 and Figure 8 The first insulating member 15 includes a bottom wall 150, a peripheral wall 151, and an extension 152. The bottom wall 150 is disposed between the first wall 111 and the conductive member 13 along the thickness direction z of the first wall. A through-hole 1500 is formed in the bottom wall 150, extending through the bottom wall 150 along the thickness direction z of the first wall. The power supply terminal 14 passes through the through-hole 1500 so that the electrode terminal 14 is connected to the conductive member 13.

[0141] One end of the peripheral wall 151 surrounds the edge of the bottom wall 150, and the peripheral wall 151 surrounds the outer periphery of the conductive element 13. Optionally, the inner side of the peripheral wall 151 contacts the outer peripheral surface of the conductive element 13. Optionally, there is a gap between the inner side of the peripheral wall 151 and the outer peripheral surface of the conductive element 13. Optionally, along the thickness direction z of the first wall, the side of the peripheral wall 151 opposite to the bottom wall 150 is lower than the side of the conductive element 13 opposite to the first wall 111. Optionally, along the thickness direction z of the first wall, the side of the peripheral wall 151 opposite to the bottom wall 150 may protrude beyond the side of the conductive element 13 opposite to the first wall 111. Optionally, along the thickness direction z of the first wall, the side of the peripheral wall 151 opposite to the bottom wall 150 may be flush with the side of the conductive element 13 opposite to the first wall 111.

[0142] Please see Figure 7 , Figure 8 and Figure 9 The extension 152 is located on the side of the first wall 111 opposite to the electrode assembly 12, and the extension 152 is located on the outer peripheral side of the conductive member 13. The extension 152 protrudes from the outer peripheral surface of the peripheral wall 151. Please refer to [link to relevant documentation]. Figure 8 Along the radial direction of the perforation 1500 (the radial direction of the perforation 1500 is perpendicular to the axial direction of the perforation 1500), the extension 152 is located on the side of the peripheral wall 151 opposite to the conductive element 13.

[0143] In some embodiments, the first insulating member 15 is an integrally molded structure, and the bottom wall 150, the peripheral wall 151 and the extension 152 are made by an integral molding process, such as injection molding, thermoplastic molding, etc.

[0144] In other embodiments, the first insulating member 15 is a split structure, with the bottom wall 150, the peripheral wall 151 and the extension 152 being combined into one unit by welding, bonding, melting or other means.

[0145] In other embodiments, the bottom wall 150 and the peripheral wall 151 are integrally formed structures, and the extension 152 is connected to the peripheral wall 151 by means of bonding, welding, hot melting, etc.

[0146] In some embodiments, the bottom wall 150, the peripheral wall 151, and the extension 152 may be made of the same or different materials, but the materials of the bottom wall 150, the peripheral wall 151, and the extension 152 all have insulating properties.

[0147] For example, the materials of the bottom wall 150, the peripheral wall 151, and the extension 152 include, but are not limited to, polyethylene, polypropylene, polyimide, polyetheretherketone, or polytetrafluoroethylene.

[0148] In some embodiments, the first insulating member 15 can be made of an insulating material with good thermal conductivity, such as polyimide or polyetheretherketone. By selecting an insulating material with good thermal conductivity, the cooling performance of the battery cell 10 can be effectively improved, reducing the risk of thermal runaway of the battery cell 10. At the same time, by providing the extension 152, the heat exchange area between the first insulating member 15 and the outer casing 11 can be increased, thereby effectively improving the cooling performance of the battery cell 10 and effectively reducing the risk of thermal runaway of the battery cell 10.

[0149] Optionally, in some embodiments of this application, the battery cell 10 has two sets of conductive elements 13 and electrode terminals 14. One set of conductive elements 13 and electrode terminals 14 corresponds to the positive electrode, and the conductive elements 13 of this set are connected to the positive electrode tab through the corresponding electrode terminals 14. The other set of conductive elements 13 and electrode terminals 14 corresponds to the negative electrode, and the conductive elements 13 of this set are connected to the negative electrode tab through the corresponding electrode terminals 14.

[0150] Optionally, in this application, the battery cell 10 has a set of conductive elements 13 and electrode terminals 14. The conductive elements 13 are connected to the corresponding polarity tabs through the electrode terminals 14, and the opposite polarity tabs can be electrically connected to the casing 11.

[0151] In the above solution, by providing an extension 152 protruding from the peripheral wall 151 of the first insulating member 15, the creepage distance between the conductive member 13 and the first wall 111 can be effectively increased, reducing the risk of internal short circuits in the battery cell 10 caused by the contact between the conductive member 13 and the first wall 111. Furthermore, at the battery device 100 level, the risk of short circuits between adjacent battery cells 10 caused by the contact between the conductive member 13 and the first wall 111 leading to a charged casing 11 can be reduced. In particular, in a battery device 100 with large-capacity battery cells 10, the extension 152 effectively reduces the risk of short circuits caused by the contact between the conductive member 13 and the first wall 111, thus improving the reliability of the battery device 100.

[0152] According to some embodiments of this application, the extension 152 is disposed around the peripheral wall 151.

[0153] Please see Figure 8 and Figure 9 The extension 152 is disposed on the outer peripheral surface of the peripheral wall 151 and is disposed around the peripheral wall 151. Along the radial direction of the through hole 1500, any part of the peripheral wall 151 is located between the extension 152 and the conductive member 13.

[0154] For example, the extension 152 can be an annular structure, with its inner periphery connected to the outer periphery of the peripheral wall 151.

[0155] Optionally, along the circumferential direction of the peripheral wall 151, any portion of the extension 152 protruding from the peripheral wall 151 can have the same size. Optionally, along the circumferential direction of the peripheral wall 151, the size of the extension 152 protruding from the peripheral wall 151 can be unequal.

[0156] In the above scheme, an extension 152 is provided around the outer periphery of the peripheral wall 151, which can increase the creepage distance between any part of the conductive component 13 in the circumferential direction and the first wall 111, reduce the risk of short circuit of the battery cell 10 caused by the contact between the conductive component 13 and the first wall 111, and thus cause thermal runaway of the battery cell 10, thereby making the battery cell 10 more reliable and thus making the battery device 100 more reliable.

[0157] In other embodiments, the extension 152 may be partially disposed on the outer peripheral surface of the peripheral wall 151. Optionally, the extension 152 is disposed intermittently on the outer peripheral surface of the peripheral wall 151 along the circumferential direction of the peripheral wall 151.

[0158] According to some embodiments of this application, please refer to Figure 7 Along the direction of the electrode assembly 12 pointing to the first wall 111, the end of the peripheral wall 151 away from the bottom wall 150 protrudes from the extension 152.

[0159] In some embodiments, along the thickness direction z of the first wall, the peripheral wall 151 has a first end connected to the bottom wall 150 and a second end opposite to the bottom wall 150, the second end being disposed protruding from the extension 152.

[0160] Optionally, the extension 152 may be located between the first end and the second end.

[0161] Alternatively, the extension 152 may protrude beyond the first end.

[0162] Alternatively, the extension 152 may be flush with the plane of the first end.

[0163] In the above solution, by setting the peripheral wall 151 to protrude from the extension 152, on the one hand, the peripheral wall 151 effectively covers the outer periphery of the conductive member 13, increasing the creepage distance between the conductive member 13 and the first wall 111; on the other hand, it can reduce the material used in the extension 152, thereby reducing the material cost of the first insulating member 15 and increasing the mass energy density of the battery cell 10.

[0164] In other embodiments, the extension 152 may protrude from the second end, or the extension 152 may be flush with the plane of the second end.

[0165] According to some embodiments of this application, please refer to Figure 7 Along the thickness direction z of the first wall, the side of the extension 152 facing the first wall 111 comes into contact with the first wall 111.

[0166] In some embodiments, along the thickness direction z of the first wall, the side of the extension 152 facing the first wall 111 is the inner side of the extension 152, and the side of the extension 152 away from the first wall 111 is the outer side of the extension 152. The inner side of the extension 152 may be in contact with the first wall 111.

[0167] Optionally, the inner side of the extension 152 and the first wall 111 can be in direct contact, or they can be connected as one piece by means of bonding or other methods.

[0168] In the above solution, by setting the extension 152 to contact the first wall 111, the contact area between the first insulating member 15 and the first wall 111 can be increased, thereby increasing the assembly strength between the first insulating member 15 and the first wall 111 and reducing the risk of separation between the first insulating member 15 and the first wall 111, thus making the battery cell 10 highly reliable, and consequently making the battery device 100 highly reliable.

[0169] In other embodiments, there is a gap between the inner side of the extension 152 and the first wall 111.

[0170] According to some embodiments of this application, please refer to Figure 7 Along the thickness direction z of the first wall, a groove 1111 is formed on the side of the first wall 111 opposite to the electrode assembly 12, the bottom wall 150 is located inside the groove 1111, and the extension 152 is located outside the groove 1111.

[0171] In some embodiments, a groove 1111 is formed on the outer side of the first wall 111, the bottom wall 150 is located in the groove 1111, and the conductive element 13 is disposed in the groove-shaped structure formed by the bottom wall 150 and the peripheral wall 151.

[0172] Optionally, a protrusion is formed on the side of the first wall 111 facing the electrode assembly 12 along the thickness direction z of the first wall, and the position of the protrusion corresponds to the groove 1111.

[0173] In some embodiments, the groove 1111 may be formed on the outer surface of the first wall 111 by processes such as stamping, die casting or casting.

[0174] Optionally, the plane containing the outer side of the first wall 111 protrudes beyond the plane containing the surface of the bottom wall 150 facing the conductive element 13, and a portion of the peripheral wall 151 is located in the groove 1111.

[0175] Optionally, the plane containing the outer surface of the first wall 111 is flush with the plane containing the surface of the bottom wall 150 facing the conductive element 13.

[0176] Optionally, the plane of the bottom wall 150 facing the conductive element 13 protrudes beyond the plane of the outer side of the first wall 111.

[0177] The phrase "the extension 152 is located outside the groove 1111" can be understood as meaning that the extension 152 is not within the groove 1111. For example, along the thickness direction z of the first wall, the extension 152 is located on the side of the first wall 111 opposite to the electrode assembly 12. Optionally, the extension 152 contacts the outer surface of the first wall 111. Optionally, the extension 152 and the outer surface of the first wall 111 are spaced apart from each other.

[0178] In the above solution, by setting a groove 1111 on the outer side of the first wall 111, and setting the bottom wall 150 of the first insulating member 15 in the groove 1111 and the extension 152 outside the groove 1111, the positioning accuracy between the first insulating member 15 and the first wall 111 can be effectively improved, the assembly difficulty of the first insulating member 15 can be reduced, thereby improving the manufacturing efficiency of the battery cell 10 and thus improving the manufacturing efficiency of the battery device 100.

[0179] In some other embodiments, a portion of the bottom wall 150 is located within the groove 1111, and another portion of the bottom wall 150 is located outside the groove 1111.

[0180] In some other embodiments, a portion of the extension 152 may be located within the groove 1111, and another portion of the extension 152 may be located outside the groove 1111.

[0181] In some other embodiments, the extension 152 may be entirely located within the groove 1111.

[0182] According to other embodiments of this application, the extension 152 completely covers the side of the first wall 111 opposite to the electrode assembly 12.

[0183] In some embodiments, the extension 152 can completely cover the outer surface of the first wall 111, that is, on the same projection plane perpendicular to the thickness direction z of the first wall, the orthographic projection of the extension 152 covers the orthographic projection of the first wall 111.

[0184] In the above solution, by setting the extension 152 to cover the outside of the first wall 111, the conductive element 13 and the first wall 111 can be effectively insulated and isolated, further reducing the risk of short circuit of the battery cell 10 caused by the conductive element 13 and the first wall 111 overlapping each other, thereby effectively improving the reliability of the battery cell 10 and thus effectively improving the reliability of the battery device 100.

[0185] In some other embodiments, the orthographic projection of the extension 152 covers a portion of the orthographic projection of the first wall 111 on the same projection plane along the thickness direction z perpendicular to the first wall.

[0186] According to some embodiments of this application, the thickness of the extension 152 along the thickness direction z of the first wall is h, satisfying 0.2mm≤h≤1.5mm.

[0187] Please see Figure 7 The thickness h of the extension 152 can be 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm...1.4mm, 1.5mm or any value between two adjacent values.

[0188] Optionally, along the thickness direction z of the first wall, the thickness of the extension 152 is h, satisfying 0.5mm≤h≤1mm, for example 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm or any value between two adjacent values.

[0189] In the above solution, by setting the thickness of the extension 152 to not less than 0.2 mm, the insulation performance of the extension 152 can be guaranteed to a certain extent, reducing the risk of short circuit of the battery cell 10 caused by the electrical connection between the conductive component 13 and the first wall 111, thus making the battery device 100 highly reliable; by setting the thickness of the extension 152 to not more than 1.5 mm, the risk of the battery cell 10's volumetric energy density decreasing due to the extension 152 being too thick and occupying the space along the first direction x of the battery cell 10 can be reduced.

[0190] In other embodiments of this application, the thickness h of the extension 152 may be less than 0.2 mm or greater than 1.5 mm.

[0191] According to some embodiments of this application, the following condition is met: 0.5mm ≤ h ≤ 1mm.

[0192] In some embodiments, the thickness h of the extension 152 can be 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, or any value between two adjacent values.

[0193] In the above solution, by setting the thickness of the extension 152 to not less than 0.5 mm, the insulation performance of the extension 152 can be effectively improved, reducing the risk of short circuit of the battery cell 10 caused by the electrical connection between the conductive component 13 and the first wall 111, thus making the battery device 100 highly reliable; by setting the thickness of the extension 152 to not more than 1 mm, the risk of the battery cell 10's volumetric energy density decreasing due to the extension 152 being too thick and occupying the space along the first direction x of the battery cell 10 can be effectively reduced.

[0194] According to some embodiments of this application, the extension 152 protrudes from the outer peripheral surface of the peripheral wall 151 by a dimension t, which satisfies 0.5mm≤t≤5mm.

[0195] Please see Figure 7 The dimension t of the extension 152 protruding from the outer peripheral surface of the peripheral wall 151 can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm...4.8mm, 4.9mm, 5mm or any value between two adjacent values.

[0196] Optionally, the extension 152 protrudes from the outer peripheral surface of the peripheral wall 151 by a dimension t, satisfying 1mm≤t≤2mm, for example, 1mm, 1.1mm, 1.2mm, 1.3mm…1.8mm, 1.9mm, 2mm or any value between two adjacent values.

[0197] In the above solution, by setting the protrusion of the extension 152 relative to the peripheral wall 151 to not less than 0.5mm, the creepage distance between the conductive member 13 and the first wall 111 can be effectively increased, reducing the risk of short circuit of the battery cell 10 caused by the contact between the conductive member 13 and the first wall 111; by setting the protrusion of the extension 152 relative to the peripheral wall 151 to not more than 5mm, the risk of interference with other structural members or occupation of space required by other structural members due to the excessive size of the extension 152 can be reduced, making the battery cell 10 structure compact and the battery device 100 structure compact.

[0198] In some other embodiments, the dimension t of the extension 152 protruding from the outer peripheral surface of the peripheral wall 151 can be less than 0.5 mm or greater than 5 mm.

[0199] According to some embodiments of this application, 2mm≤t≤3.5mm is satisfied.

[0200] In some embodiments, the dimension t of the extension 152 protruding from the outer peripheral surface of the peripheral wall 151 can be 2mm, 2.1mm, 2.2mm, 2.3mm...3.2mm, 3.3mm, 3.4mm, 3.5mm or any value between two adjacent values.

[0201] In the above solution, by setting the protrusion of the extension 152 relative to the peripheral wall 151 to not less than 2mm, the creepage distance between the conductive member 13 and the first wall 111 can be further increased, reducing the risk of short circuit of the battery cell 10 caused by the contact between the conductive member 13 and the first wall 111; by setting the protrusion of the extension 152 relative to the peripheral wall 151 to not more than 3.5mm, the risk of interference with other structural members or occupation of space required by other structural members due to the excessive size of the extension 152 can be effectively reduced, making the battery cell 10 structure compact and the battery device 100 structure compact.

[0202] According to some embodiments of this application, the peripheral wall 151 and the extension 152 are integrally formed; or, the peripheral wall 151 and the extension 152 are separate structures, and the peripheral wall 151 and the extension 152 are connected to each other.

[0203] In some embodiments, the peripheral wall 151 and the extension 152 are integrally formed. Optionally, the peripheral wall 151 and the extension 152 can be manufactured by processes such as injection molding or thermoplasticizing.

[0204] In other embodiments, the peripheral wall 151 and the extension 152 are separate structures, which are combined into one unit by processes such as welding, bonding, and hot melting.

[0205] In the above scheme, the peripheral wall 151 and the extension 152 are integrally formed, resulting in high structural strength for both the extension 152 and the peripheral wall 151. This reduces the risk of the extension 152 separating from the peripheral wall 151, which would reduce the creepage distance between the conductive component 13 and the first wall 111 and affect the reliability of the battery cell 10. Alternatively, the peripheral wall 151 and the extension 152 can be separate structures connected to each other, which can reduce the mold opening cost of the first insulating component 15 and facilitate the control of the manufacturing cost of the battery cell 10.

[0206] According to some embodiments of this application, the battery cell 10 further includes a second insulating member 16, at least a portion of which is disposed on the side of the first wall 111 opposite to the electrode assembly 12 and at least partially covers the first wall 111.

[0207] Please see Figure 4 and Figure 7 The battery cell 10 also includes a second insulating member 16, which is disposed on the outer side of the first wall 111. In some embodiments, the second insulating member 16 may be a sheet-like structure, such as a top patch.

[0208] Optionally, the second insulating member 16 can be connected to the outer side of the first wall 111, for example, the second insulating member 16 is bonded to the outer side of the first wall 111.

[0209] Optionally, the second insulating member 16 may be connected to the extension 152 to be disposed on the outside of the first wall 111.

[0210] Optionally, a portion of the second insulating member 16 may be connected to the outer side of the first wall 111, and another portion may be connected to the extension 152.

[0211] In the above scheme, by setting a second insulating component 16 on the outside of the first wall 111, the first wall 111 can be insulated, reducing the short circuit between the first wall 111 and the external circuit, and ensuring the normal operation of the battery cell 10 to a certain extent; on the other hand, the first wall 111 can be protected, reducing the risk of mechanical damage to the first wall 111 caused by external structural components.

[0212] According to some embodiments of this application, the second insulating member 16 has a first through hole 160 through which the conductive member 13 passes.

[0213] In some embodiments, the second insulating member 16 has a first through hole 160, which is used to avoid the conductive member 13 and allows the conductive member 13 to pass through so as to output or input electrical energy.

[0214] Optionally, the first through hole 160 may be disposed around the outer periphery of the conductive member 13, and the hole wall of the first through hole 160 may be spaced apart from or in contact with the outer peripheral surface of the conductive member 13.

[0215] Optionally, the first through hole 160 may be disposed around the outer periphery of the conductive member 13, and the hole wall of the first through hole 160 may be spaced apart from or in contact with the peripheral wall 151 of the first insulating member 15.

[0216] In the above solution, by providing a first through hole 160 on the second insulating member 16, it is possible to avoid the second insulating member 16 interfering with the conductive member 13 and affecting the electrical connection between the conductive member 13 and the external busbar component.

[0217] According to some embodiments of this application, along the thickness direction z of the first wall, a portion of the second insulating member 16 and an extension 152 are stacked on each other, with the extension 152 located between the second insulating member 16 and the first wall 111.

[0218] Please see Figure 7 A portion of the second insulating member 16 is stacked on top of the extension 152, and the side of the extension member facing away from the first wall 111 is in contact with the inner side of the second insulating member 16.

[0219] Optionally, on the same projection plane perpendicular to the thickness direction z of the first wall, the orthographic projection of the second insulating member 16 completely covers the orthographic projection of the extension 152; or a portion of the orthographic projection of the second insulating member 16 overlaps with a portion of the orthographic projection of the extension 152.

[0220] For example, please see Figure 7 The second insulating member 16 has a gap between the hole wall of the first through hole 160 and the peripheral wall 151, that is, the second insulating member 16 covers part of the extension 152.

[0221] In some embodiments, the portions of the second insulating member 16 and the extension 152 that are stacked together can be interconnected, and the connection relationship between the two is diverse, including but not limited to adhesive bonding, heat fusion bonding, or connector bonding.

[0222] In other embodiments, the portions of the second insulating member 16 and the extension 152 that are stacked on top of each other can be in direct contact.

[0223] In the above solution, by placing the extension 152 between the second insulating member 16 and the first wall 111, the connection strength between the second insulating member 16 and the first wall 111 can be improved, reducing the risk of the second insulating member 16 detaching from the first wall 111. On the other hand, with the abutment of the second insulating member 16, the extension 152 can be stably placed on the outside of the first wall 111, which increases the creepage distance between the conductive member 13 and the first wall 111, thus improving the reliability of the battery cell 10 and consequently improving the reliability of the battery device 100.

[0224] According to some embodiments of this application, on the same projection plane perpendicular to the thickness direction z of the first wall, the orthographic projection of the second insulating member 16 and the orthographic projection of the extension 152 have an overlapping area, the width of the overlapping area being c, which satisfies 0.5mm≤c≤5mm.

[0225] Please see Figure 7 On the same projection plane perpendicular to the thickness direction z of the first wall, the orthographic projection of the second insulating member 16 and the orthographic projection of the extension 152 have an overlapping area. The width c of the overlapping area can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm...4.7mm, 4.8mm, 4.9mm, 5mm or any value between two adjacent values.

[0226] For example, the value of c can be 1.5 mm.

[0227] In the above solution, by setting the width of the overlapping area between the second insulating member 16 and the extension 152 to not less than 0.5 mm, the connection strength between the second insulating member 16, the extension 152 and the first wall 111 can be effectively improved, reducing the risk of separation between the three and making the battery cell 10 highly reliable. By setting the width of the overlapping area between the second insulating member 16 and the extension 152 to not more than 5 mm, the risk of interference with other structural members or occupation of space required by other structural members due to the excessive size of the extension 152 can be reduced, making the battery cell 10 and the battery device 100 have a compact structure.

[0228] According to some embodiments of this application, the outer casing 11 is a steel casing.

[0229] In the above scheme, by setting the outer shell 11 as a steel shell, the wall thickness of the outer shell 11 can be designed to be thin, which is conducive to improving the volumetric energy density of the battery cell 10, and thus conducive to improving the volumetric energy density of the battery device 100.

[0230] According to some embodiments of this application, please refer to Figure 10 , Figure 10 This is a perspective view of a battery cell 10 in some embodiments of this application.

[0231] The outer shell 11 is a square shell. The dimension of the outer shell 11 in the first direction x is W1, the dimension of the outer shell 11 in the second direction y is T1, and the dimension of the outer shell 11 in the thickness direction z of the first wall is H1, satisfying the following: 3720cm3≤W1*T1*H1≤12500cm3, 60mm≤T1≤150mm, 120mm≤H1≤400mm, 200mm≤W1≤1500mm. The first direction x, the second direction y, and the thickness direction z of the first wall are all perpendicular to each other.

[0232] The first direction x can be the width direction of the battery cell 10, the second direction y can be the thickness direction of the battery cell 10, and the thickness direction z of the first wall can be parallel to the height direction of the battery cell 10.

[0233] The statement “The size of the outer casing 11 in the first direction x is W1, the size of the outer casing 11 in the second direction y is T1, and the size of the outer casing 11 in the thickness direction z of the first wall is H1” can be understood as the outer casing 11 of the battery cell 10 having a width of W1, a thickness of T1, and a height of H1.

[0234] In some embodiments, the width of the outer casing 11 is W1, the thickness is T1, and the height is H1, which can satisfy the following condition: 3720cm 3 ≤W1*T1*H1≤12500cm 3, 60mm≤T1≤150mm, 120mm≤H1≤400mm, 200mm≤W1≤1500mm.

[0235] For example, W1*T1*H1 is the value obtained by multiplying W1, T1, and H1, and W1*T1*H1 can take the value 3720cm. 3 Up to 12500cm 3 Any value between, and the two values.

[0236] For example, the value of T1 can be no less than 60mm and no more than 150mm. For example, the value of T1 can be 60mm, 70mm, 80mm, 90mm, 100mm, 110mm, 120mm, 130mm, 140mm, 150mm or any value between two adjacent values.

[0237] For example, the value of H1 can be no less than 120mm and no more than 400mm. For example, the value of T1 can be 120mm, 130mm, 140mm, 150mm, 160mm...360mm, 370mm, 380mm, 390mm, 400mm or any value between two adjacent values.

[0238] For example, the value of W1 can be no less than 200mm and no more than 1500mm. For example, the value of T1 can be 2000mm, 210mm, 220mm, 230mm, 240mm...1360mm, 1370mm, 1380mm, 1390mm, 1400mm or any value between two adjacent values.

[0239] In the above scheme, by limiting the external contour dimensions of the battery cell 10, the internal space of the battery cell 10 is made larger to accommodate more electrochemical substances, thereby forming a battery cell 10 with a larger capacity. For the battery cell 10 with a larger capacity, an extension 152 is provided on the peripheral wall 151 of the first insulating member 15, which can effectively increase the creepage distance between the conductive member 13 and the first wall 111, so that the insulation performance of the battery cell 10 is high, thereby reducing the risk of short circuit of the battery cell 10, so that the battery cell 10 with a larger capacity can have high reliability, and thus the battery device 100 with such a battery cell 10 has high energy storage reliability or high discharge reliability.

[0240] Some embodiments of this application provide a battery device 100, which includes the battery cell 10 described above.

[0241] See Figure 3 As shown, the battery device 100 may also include a housing 20, in which the battery cells 10 are housed.

[0242] In some embodiments, the housing 20 may include a first housing body 21 and a second housing body 22, the first housing body 21 and the second housing body 22 covering each other, the first housing body 21 and the second housing body 22 together defining an assembly space for accommodating the battery cell 10.

[0243] Optionally, the second box body 22 can be a hollow structure with one end open, and the first box body 21 can be a plate-like structure. The first box body 21 covers the open side of the second box body 22 so that the first box body 21 and the second box body 22 together define the assembly space; the first box body 21 and the second box body 22 can also be hollow structures with one side open, and the open side of the first box body 21 covers the open side of the second box body 22.

[0244] Of course, the box 20 formed by the first box body 21 and the second box body 22 can be of various shapes, such as a cylinder or a cuboid. For example, in... Figure 3 In the middle, box 20 has a rectangular structure.

[0245] Optionally, there may be multiple battery cells 10 disposed within the housing 20. For example, in... Figure 3 In this battery device 100, multiple battery cells 10 are arranged inside the housing 20. These battery cells 10 can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that some of the battery cells 10 are connected in series and others in parallel. The multiple battery cells 10 can be directly connected in series, parallel, or in a mixed configuration and then housed within the housing 20. Alternatively, the battery device 100 can also be composed of multiple battery cells 10 first connected in series, parallel, or in a mixed configuration to form battery modules, and then these battery modules can be connected in series, parallel, or in a mixed configuration to form a whole and housed within the housing 20.

[0246] It should be noted that in some embodiments, the battery device 100 may not have a housing 20. The battery device 100 includes multiple battery cells 10, and the battery device 100, composed of multiple battery cells 10 electrically connected together, can be directly mounted onto the electrical device 1000 to provide power to the electrical device 1000 through the multiple battery cells 10. That is, the housing 20 can be part of the electrical device 1000. Taking a vehicle as an example, the housing 20 can be part of the vehicle's chassis structure. For example, a portion of the housing 20 can be at least a part of the vehicle's floor, or a portion of the housing 20 can be at least a part of the vehicle's crossbeams and longitudinal beams.

[0247] Some embodiments of this application provide an energy storage device 2000, which includes the battery cell 10 and / or battery device 100 provided above.

[0248] Please see Figure 2 The energy storage device 2000 can be an energy storage cabinet, which includes a cabinet body 2001 and multiple battery cells 10. The multiple battery cells 10 can be installed inside the cabinet body 2001. The multiple battery cells 10 are interconnected in series, parallel, or in a mixed connection through a busbar component.

[0249] Optionally, a battery device 100 may also be installed inside the cabinet 2001.

[0250] Some embodiments of this application provide an electrical device 1000, which includes the battery cell 10 and / or battery device 100 described above.

[0251] The electrical device 1000 can be any of the aforementioned devices or systems that utilize battery cells 10 and / or battery devices 100. For example, the electrical device 1000 can be a vehicle, which can be a range-extended vehicle, a pure electric vehicle, or a gasoline-powered vehicle. The electrical energy provided by the battery cells 10 can be used to meet the vehicle's power needs during starting, navigation, and driving.

[0252] Some embodiments of this application also provide a battery cell 10, please refer to [link to relevant documentation]. Figures 4-9 .

[0253] The battery cell 10 includes a casing 11, an electrode assembly 12, a conductive element 13, an electrode terminal 14, a first insulating element 15, and a second insulating element 16. The casing 11 has a first wall 111, and the electrode assembly 12 is disposed within the casing 11. The conductive element 13, the electrode terminal 14, and the first insulating element 15 correspond one-to-one. The battery cell 10 includes two sets of conductive elements 13, electrode terminals 14, and first insulating elements 15, respectively corresponding to the positive and negative electrodes. An example is provided using one set of conductive elements 13, electrode terminals 14, and first insulating elements 15.

[0254] The conductive element 13 is disposed on the outer side of the first wall 111. A portion of the electrode terminal 14 is located on the inner side of the first wall 111 to connect with the tab of the electrode assembly 12. The other portion of the electrode terminal 14 passes through the first wall 111 and is riveted to the conductive element 13. The first insulating element 15 includes a bottom wall 150, a peripheral wall 151, and an extension 152. The bottom wall 150 is located between the first wall 111 and the conductive element 13. The peripheral wall 151 is disposed on the outer peripheral surface of the conductive element 13. The extension 152 protrudes from the outer peripheral surface of the peripheral wall 151 and is disposed around the peripheral wall 151.

[0255] The second insulating member 16 is disposed on the outside of the first wall 111. The second insulating member 16 has a first through hole 160 for the conductive member 13 to pass through, so that the conductive member 13 can be connected to an external structural member, such as the conductive member 13 being connected to a busbar component.

[0256] A portion of the second insulating member 16 may be connected to the side of the extension 152 opposite to the first wall 111, that is, a portion of the second insulating member 16 and the extension 152 are stacked on top of each other. Optionally, the second insulating member 16 may be bonded to the surface of the extension 152.

[0257] In the above solution, by providing an extension 152 protruding from the peripheral wall 151 of the first insulating member 15, the creepage distance between the conductive member 13 and the first wall 111 can be effectively increased, reducing the risk of internal short circuits in the battery cell 10 caused by the contact between the conductive member 13 and the first wall 111. Furthermore, at the battery device 100 level, the risk of short circuits between adjacent battery cells 10 caused by the contact between the conductive member 13 and the first wall 111 leading to a charged casing 11 can be reduced. In particular, in a battery device 100 with large-capacity battery cells 10, the extension 152 effectively reduces the risk of short circuits caused by the contact between the conductive member 13 and the first wall 111, thus improving the reliability of the battery device 100.

[0258] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery cell, characterized by, The battery cell includes: a housing having a first wall; an electrode assembly disposed in the housing; a conductive member disposed on a side of the first wall facing away from the electrode assembly; an electrode terminal connected to the conductive member, and the electrode terminal is electrically connected to the electrode assembly; a first insulating member including a bottom wall and a peripheral wall, the bottom wall is disposed between the first wall and the conductive member, and at least a portion of the peripheral wall surrounds an outer periphery of the conductive member; wherein the first insulating member further includes an extension portion, the extension portion protrudes from an outer peripheral surface of the peripheral wall.

2. The battery cell according to claim 1, wherein the extension portion is annularly disposed on the peripheral wall.

3. The battery cell according to claim 1, wherein in a direction of the electrode assembly pointing to the first wall, an end of the peripheral wall away from the bottom wall protrudes from the extension portion.

4. The battery cell according to claim 1, wherein in a thickness direction of the first wall, a side of the extension portion facing the first wall is in contact with the first wall.

5. The battery cell according to claim 1, wherein in the thickness direction of the first wall, a side of the first wall facing away from the electrode assembly is formed with a groove, the bottom wall is located in the groove, and the extension portion is located outside the groove.

6. The battery cell according to claim 1, wherein the extension portion completely covers the side of the first wall facing away from the electrode assembly.

7. The battery cell according to claim 1, wherein in the thickness direction of the first wall, a thickness of the extension portion is h, and 0.2 mm≤h≤1.5 mm is satisfied.

8. The battery cell according to claim 7, wherein 0.5 mm≤h≤1 mm is satisfied.

9. The battery cell according to claim 1, wherein a dimension of the extension portion protruding from the outer peripheral surface of the peripheral wall is t, and 0.5 mm≤t≤5 mm is satisfied.

10. The battery cell according to claim 9, wherein 2 mm≤t≤3.5 mm is satisfied.

11. The battery cell according to claim 1, wherein the peripheral wall and the extension portion are integrally formed; or the peripheral wall and the extension portion are separate structures, and the peripheral wall and the extension portion are connected to each other.

12. The battery cell according to claim 1, further comprising a second insulating member, at least a portion of the second insulating member is disposed on a side of the first wall facing away from the electrode assembly, and at least partially covers the first wall.

13. The battery cell according to claim 12, wherein the second insulating member has a first through hole, and the conductive member passes through the first through hole.

14. The battery cell according to claim 12, wherein in a thickness direction of the first wall, a portion of the second insulating member and the extension portion are stacked with each other, and the extension portion is located between the second insulating member and the first wall.

15. The battery cell according to claim 14, wherein ​ On the same projection plane perpendicular to the thickness direction of the first wall, the second insulating member has an overlapping area with the extension in the orthographic projection, and the width of the overlapping area is c, satisfying 0.5mm≤c≤5mm. 16.The battery cell according to claim 1, wherein The shell is a steel shell. 17.The battery cell according to claim 1, wherein The shell is a square shell, the size of the shell in a first direction is W1, the size of the shell in a second direction is T1, the size of the shell in the thickness direction of the first wall is H1, satisfying 3720cm 3 ≤W1*T1*H1≤12500cm 3, 60mm≤T1≤150mm, 120mm≤H1≤400mm, 200mm≤W1≤1500mm, and the first direction, the second direction and the thickness direction of the first wall are perpendicular to each other.

18. A battery device characterized by comprising: The battery cell according to any one of claims 1-17.

19. An energy storage device, characterized by, The battery device according to claim 18.

20. An electrical device, comprising: The battery device according to claim 18. The battery device according to claim 18.

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