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 part is arranged on the outer side of the first wall. The electrode terminal is connected with the conductive piece, and the electrode terminal is electrically connected with the electrode assembly. The first insulator is at least partially disposed between the conductive member and the first wall. A gap is formed between the conductive part and the first insulating part in the thickness direction of the first wall. 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 outside the first wall. The electrode terminals are connected to the conductive element and are electrically connected to the electrode assembly. The first insulating element is at least partially disposed between the conductive element and the first wall. A gap is formed between the conductive element and the first insulating element along the thickness direction of the first wall.

[0007] In the above scheme, a gap is formed between the conductive component and the first insulating component, which can reduce the risk of the first insulating component melting due to welding of the current-collecting component and the conductive component to a certain extent, and ensure the structural integrity of the first insulating component to a certain extent, thereby improving the reliability of the battery cell and thus improving the reliability of the battery device.

[0008] According to some embodiments of this application, the maximum size of the gap along the thickness direction of the first wall is not less than 0.05 mm and not greater than 1 mm.

[0009] In the above scheme, by setting the gap size to not less than 0.05mm along the thickness direction of the first wall, the impact of the high temperature generated by welding the current-collecting component and the conductive component on the first insulating component can be effectively reduced, ensuring the structural integrity of the first insulating component to a certain extent and improving the reliability of the battery device. By setting the gap size to not more than 1mm, the risk of the conductive component occupying too much space along the thickness direction of the first wall due to the gap setting can be reduced, resulting in a decrease in the volumetric energy density of the battery cell, thus enabling the battery device to have a higher volumetric energy density.

[0010] According to some embodiments of this application, the electrode terminal includes a first electrode post and a second electrode post. The first electrode post is connected to a conductive element and electrically connected to an electrode assembly. The second electrode post is also connected to a conductive element and electrically connected to the electrode assembly. The first and second electrode posts are spaced apart along a first direction, which is perpendicular to the thickness direction of the first wall. A gap is located between the first and second electrode posts along the first direction.

[0011] In the above scheme, the conductive component is electrically connected to the electrode assembly through the first and second terminals. On the one hand, this can effectively improve the overcurrent capacity of the battery cell and improve the charging and discharging performance of the battery cell. On the other hand, it can effectively improve the connection strength between the conductive component and the first wall, reduce the risk of the conductive component separating from the first wall due to external impact or internal expansion of the battery cell, and ensure the structural stability of the battery cell to a certain extent, so that the battery cell has high reliability, and thus the battery device has high reliability.

[0012] According to some embodiments of this application, along a first direction, the conductive element includes a first body, a connecting portion, and a second body connected in sequence, a first pole connected to the first body, a second pole connected to the second body, and the connecting portion located between the first pole and the second pole.

[0013] In the above scheme, the first terminal is connected to the first body, and the second terminal is connected to the second body. This reduces the interference of the connection between the terminal and the conductive component on the busbar component. On the one hand, it allows the conductive component to have a larger connection area to connect with the busbar component, which can effectively improve the overcurrent capacity of the battery device at the battery device level, resulting in high charge and discharge performance of the battery device. On the other hand, it allows a gap of appropriate size to be formed between the conductive component and the first insulating component, thereby effectively reducing the risk of the first insulating component melting due to welding of the busbar component and the conductive component, resulting in high reliability of the battery cell, and thus high reliability of the battery device.

[0014] According to one embodiment of this application, the location of the maximum size of the gap corresponds to the middle of the connecting portion along the first direction.

[0015] In the above scheme, the connecting part is used to weld with the external busbar component. By setting the maximum size of the gap at the middle of the connecting part along the first direction, the risk of the first insulating component melting due to welding of the busbar component and the conductive component can be effectively reduced, which is conducive to improving the reliability of the battery cell.

[0016] According to some embodiments of this application, the size of the gap gradually decreases from the middle of the connecting portion along the first direction to both ends of the connecting portion.

[0017] In the above scheme, the gap is arched, with a large size in the middle and small sizes at both ends. On the one hand, the larger size in the middle can effectively reduce the risk of the first insulating component melting due to welding of the current-collecting component and the conductive component, which is conducive to improving the reliability of the battery cell. On the other hand, the smaller size at both ends can reduce the risk of the conductive component occupying too much space due to the gap setting, which would affect the volumetric energy density of the battery cell.

[0018] According to some embodiments of this application, a recess is formed on the side of the conductive element facing the first wall along the thickness direction of the first wall, and a gap is formed between the wall surface of the recess and the first insulating element.

[0019] In the above scheme, by forming a recess on the side of the connection facing the first wall, the difficulty of forming the gap is reduced, which is conducive to improving the manufacturing efficiency of the battery cell.

[0020] According to some embodiments of this application, the wall surface of the recess is an arc surface.

[0021] In the above solution, by setting the wall of the recess as an arc surface, the molding difficulty of the recess can be reduced (for example, the recess is formed due to the bending of the conductive component), resulting in high manufacturing efficiency of the battery cell and improving the manufacturing efficiency of the battery device. On the other hand, the arched shape of the recess wall makes the middle size of the gap large, which can effectively reduce the risk of the first insulating component melting due to the welding of the current-collecting component and the conductive component, thus improving the reliability of the battery cell. The smaller size at both ends of the gap can reduce the risk that the conductive component occupies too much space due to the gap, thus affecting the volumetric energy density of the battery cell.

[0022] According to some embodiments of this application, along the first direction, the distance between the first pole post and the second pole post is L, and the size of the recess is s, satisfying 0.5L≤s≤L.

[0023] In the above scheme, by setting the size of the gap to be greater than or equal to half the distance between the first electrode and the second electrode along the first direction, the risk of structural damage to the first insulating component due to welding of the busbar component and the conductive component can be effectively reduced. By setting the size of the gap to be no greater than the distance between the first electrode and the second electrode, the risk of reduced assembly strength between the conductive component and the first wall due to the recess can be reduced, resulting in high structural stability of the battery cell and thus high reliability of the battery device.

[0024] According to some embodiments of this application, a recess is formed on the side of the first insulating member facing the conductive member along the thickness direction of the first wall, and a gap is formed between the wall surface of the recess and the conductive member.

[0025] In the above scheme, by forming a recess on the side of the first insulating component facing the conductive component, the difficulty of forming the gap is reduced, which is conducive to improving the manufacturing efficiency of the battery cell.

[0026] According to some embodiments of this application, along the thickness direction of the first wall, the first body has a first surface opposite to the first wall, the second body has a second surface opposite to the first wall, and the connecting portion protrudes from the first surface and the second surface.

[0027] In the above solution, by setting the connecting part to protrude from the first surface and the second surface, the formation of the recess is easy, thereby making it easy to form a gap between the connecting part and the first insulating component, reducing the risk of the first insulating component melting, which is beneficial to improving the reliability of the battery cell, and thus to improving the reliability of the battery device.

[0028] According to some embodiments of this application, the connecting portion protrudes from the first surface and the second surface by no more than 1 mm along the thickness direction of the first wall.

[0029] In the above solution, by setting the size of the connecting part protruding from the first surface and the second surface to no more than 1 mm, the space occupied by the connecting part in the thickness direction of the battery cell along the first wall can be reduced, which is conducive to improving the volumetric energy density of the battery cell, and thus conducive to improving the volumetric energy density of the battery device.

[0030] According to some embodiments of this application, along the thickness direction of the first wall, the side of the first body facing the first wall contacts the first insulating element; and / or, the side of the second body facing the first wall contacts the first insulating element.

[0031] In the above solution, by connecting the first body and / or the second body to the first insulating component, the assembly strength between the conductive component, the first insulating component and the first wall is high, reducing the risk of separation between the conductive component, the first insulating component and the first wall, thus making the battery cell highly reliable and consequently making the battery device highly reliable.

[0032] According to some embodiments of this application, the first insulating member has a first through hole and a second through hole, the first pole is disposed in the first through hole, and the second pole is disposed in the second through hole.

[0033] In the above solution, by providing a first through hole for the first electrode post to pass through and connect to the conductive component, and by providing a second through hole for the second electrode post to pass through and connect to the conductive component, the risk of interference between the first insulating component and the first and second electrodes is reduced, and the risk of structural damage to the first insulating component during battery cell assembly is reduced, thus enabling the battery cell to have high reliability.

[0034] According to some embodiments of this application, the first insulating member includes a bottom wall and a peripheral wall, the bottom wall being located between the conductive member and the first wall, and at least a portion of the peripheral wall surrounding the outer peripheral surface of the conductive member. A first through hole and a second through hole are formed in the bottom wall.

[0035] In the above scheme, the bottom wall of the first insulating component is disposed between the conductive component and the first wall, and the peripheral wall is disposed around the outer peripheral surface of the conductive component. This enables a large creepage distance between the conductive component and the first wall, effectively insulating and isolating the conductive component and the first wall, reducing the risk of internal short circuits in the battery cell, and making the battery device highly reliable.

[0036] According to some embodiments of this application, the battery cell further includes a connector disposed on the inner side of the first wall and connecting the first terminal post and the second terminal post; wherein the first terminal post, the connector and the second terminal post are integrally formed.

[0037] In the above solution, the first and second terminals are connected by a connector. On the one hand, this allows both terminals to be electrically connected to the electrode assembly, improving the current-carrying capacity of the battery cell and thus enhancing its charge-discharge performance. On the other hand, it improves the assembly quality between the conductive component and the first wall, reducing the risk of separation and thus increasing the reliability of the battery cell. Furthermore, the first terminal, the connector, and the second terminal are integrally formed, providing high structural strength and improving the structural stability of the battery cell, thereby enhancing its reliability.

[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 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 all perpendicular to each other.

[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, by setting a gap between the conductive component and the first insulating component, the structural integrity of the first insulating component can be guaranteed to a certain extent, resulting in high insulation performance of the battery cell, thereby reducing the risk of internal short circuits in the battery cell. This makes the battery cells with a larger capacity more reliable, and consequently, the battery device with such a battery cell has high reliability.

[0040] According to some embodiments of this application, the outer casing is a steel casing.

[0041] 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.

[0042] Secondly, some embodiments of this application provide a battery device, which includes a current-combining component and a battery cell provided in the first aspect, wherein the current-combining component and a conductive component are connected by solder.

[0043] In the above scheme, the conductive component is welded to the busbar component to provide a highly reliable electrical connection structure between the battery cells, which is beneficial to improving the charging and discharging performance of the battery device. At the same time, a gap is formed between the conductive component and the first insulating component, which can reduce the risk of the first insulating component melting due to welding of the busbar component and the conductive component, and ensure the structural integrity of the first insulating component to a certain extent, thereby improving the reliability of the battery cells and thus improving the reliability of the battery device.

[0044] 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.

[0045] 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.

[0046] 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

[0047] 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.

[0048] Figure 1 This is a schematic diagram of a vehicle in some embodiments of this application;

[0049] Figure 2 This is a schematic diagram of an energy storage device in some embodiments of this application;

[0050] Figure 3 This is an exploded perspective view of the battery device in some embodiments of this application;

[0051] Figure 4 This is an exploded perspective view of a battery cell in some embodiments of this application;

[0052] Figure 5 This is an exploded perspective view of the first wall, conductive element, first pole, and second pole in some embodiments of this application;

[0053] Figure 6 This is an exploded perspective view of the conductive element and the first insulating element in some embodiments of this application;

[0054] Figure 7 This is a schematic diagram of the internal structure of the first wall, conductive element, first insulating element, first pole post, and second pole post in some embodiments of this application;

[0055] Figure 8 This is a schematic diagram of a partial structure of the conductive element, the first wall, and the first insulating element in some embodiments of this application;

[0056] Figure 9 This is a schematic diagram of a partial structure of the conductive element, the first wall, the first insulating element, and the busbar component in some embodiments of this application;

[0057] Figure 10 for Figure 8 Enlarged view of point A in the middle;

[0058] Figure 11 This is a schematic diagram of conductive elements in some embodiments of this application;

[0059] Figure 12 This is a perspective view of a battery cell in some embodiments of this application.

[0060] 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; 30 - Busbar component; 31 - Solder mark; 11 - Outer shell; 110 - Housing; 111 - First wall; 12 - Electrode assembly; 120 - Main body; 121 - Tab; 13 - First electrode lead-out part; 13a - Electrode terminal; 130 - Conductive component; 1300 - First body; 13000 - First Riveting hole; 13001-First surface; 1301-Connecting part; 13010-Recess; 1302-Second body; 13020-Second rivet hole; 13021-Second surface; 131-First pole post; 132-Second pole post; 133-Connector; 14-Second electrode lead-out part; 15-First insulating part; 150-First through hole; 151-Second through hole; 152-Bottom wall; 153-Peripheral wall; 16-Second insulating part; 17-Gap; 18-Sealing part; x-First direction; y-Second direction; z-Thickness direction of the first wall. Detailed Implementation

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] In this application, "multiple" means two or more (including two).

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0075] 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.).

[0076] 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.

[0077] 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.

[0078] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0079] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0080] 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.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0085] 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.

[0086] 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.

[0087] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0088] In some implementations, the electrode assembly has a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0089] In some implementations, the electrode assembly has a stacked structure.

[0090] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0091] 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.

[0092] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0093] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0094] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0095] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0096] 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.

[0097] 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.

[0098] 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.

[0099] 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.

[0100] 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.

[0101] 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.

[0102] 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.

[0103] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0104] 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 shutting down; it can be sealed or not sealed. The first enclosure body may be a top cover or a bottom plate.

[0105] 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.

[0106] 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.

[0107] 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.

[0108] 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 also needs to be taken into account.

[0109] In related technologies, a battery cell includes a casing, electrode terminals, and a first insulating member. The electrode terminals include a conductive member and electrode terminals. The conductive member is located on the outer side of a first wall, and the electrode terminals are located on the inner side of the first wall; the two are interconnected to clamp the first wall. The first insulating member is disposed between the conductive member and the first wall to insulate and isolate the conductive member and the first wall, reducing the risk of internal short circuits within the battery cell.

[0110] At the battery device level, adjacent battery cells are electrically connected via a busbar, which is connected to a conductive component. Typically, the busbar and conductive component are welded together. However, during the welding process, the high temperatures generated can cause the first insulating component to melt, leading to insulation failure in the battery cell, resulting in an internal short circuit and affecting the reliability of the battery device.

[0111] In view of this, to improve the problem of reduced battery device reliability caused by damage to the first insulating component structure due to welding of the busbar component and the conductive component, some embodiments of this application provide a battery cell. The battery cell includes a casing, an electrode assembly, a conductive component, electrode terminals, and a first insulating component. The casing has a first wall. The electrode assembly is disposed inside the casing. The conductive component is disposed outside the first wall. The electrode terminals are connected to the conductive component and are electrically connected to the electrode assembly. The first insulating component is at least partially disposed between the conductive component and the first wall. A gap is formed between the conductive component and the first insulating component along the thickness direction of the first wall.

[0112] In the above scheme, a gap is formed between the conductive component and the first insulating component, which can reduce the risk of the first insulating component melting due to welding of the current-collecting component and the conductive component to a certain extent, and ensure the structural integrity of the first insulating component to a certain extent, thereby improving the reliability of the battery cell and thus improving the reliability of the battery device.

[0113] The battery cells disclosed in this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft.

[0114] The technical solutions described in the embodiments of this application are applicable to batteries, energy storage devices using batteries, and electrical devices using batteries.

[0115] 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.

[0116] 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.

[0117] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.

[0118] Figure 1 This is a schematic diagram of a vehicle in some embodiments of this application.

[0119] The electrical device is a vehicle, and the vehicle's interior can house 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 the vehicle's 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 the vehicle's driving power source, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0120] Please see Figure 2 , Figure 2 This is a schematic diagram of an energy storage device 2000 in some embodiments of this application.

[0121] 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.

[0122] Please refer to Figure 3 , Figure 3This 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.

[0123] 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.

[0124] 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.

[0125] 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.

[0126] 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.

[0127] 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 with each other via a busbar 30. In some embodiments, the plurality of battery cell assemblies can be connected in series with each other via the busbar 30.

[0128] 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.

[0129] 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 an exploded perspective view of the battery cell 10 in some embodiments of this application. Figure 5 This is an exploded perspective view of the first wall 111, the conductive element 130, the first pole 131, and the second pole 132 in some embodiments of this application. Figure 6 This is an exploded perspective view of the conductive element 130 and the first insulating element 15 in some embodiments of this application. Figure 7 This is a schematic diagram of the internal structure of the first wall 111, conductive element 130, first insulating element 15, first pole post 131, and second pole post 132 in some embodiments of this application. Figure 8 This is a schematic diagram of a partial structure of the conductive element 130, the first wall 111, and the first insulating element 15 in some embodiments of this application. Figure 9 This is a schematic diagram of a partial structure of the conductive element 130, the first wall 111, the first insulating element 15, and the busbar 30 in some embodiments of this application.

[0130] The battery cell 10 includes a housing 11, an electrode assembly 12, a conductive element 130, an electrode terminal 13a, 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 130 is disposed outside the first wall 111. The electrode terminal 13a is connected to the conductive element 130 and is electrically connected to the electrode assembly 12. The first insulating element 15 is at least partially disposed between the conductive element 130 and the first wall 111. A gap 17 is formed between the conductive element 130 and the first insulating element 15 along the thickness direction z of the first wall.

[0131] 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 4 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.

[0132] 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.

[0133] In some embodiments, the housing 11 may be a sealed structure or a non-sealed structure.

[0134] 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.

[0135] 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.

[0136] 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.

[0137] The first wall 111 is a partial structure of the outer casing 11. The first wall 111 can be used to support the electrode leads, which can be connected to the busbar 30 to realize the input and output of electrical energy. The busbar 30 can be a power strip. In some embodiments, the first wall 111 can be a part of the casing 110, such as a side wall or bottom wall of the casing 110. In some embodiments, the first wall 111 can be an end cap.

[0138] 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.

[0139] The electrode assembly 12 includes a main body 120 and tabs 121, with the main body 120 being the primary portion of the electrode assembly 12. In some embodiments, the positive electrode in the main body 120 has a positive active material, and the negative electrode has a negative active material. The tabs 121 are electrode structures extending from the main body 120, which may not include active material, and are used for inputting or outputting the positive or negative electrode of the electrode assembly 12. The tabs 121 are electrically connected to the electrode leads to achieve an electrical connection between the electrode assembly 12 and the electrode leads. In some embodiments, the tabs 121 are located at one end of the electrode assembly 12 in the thickness direction z of the first wall, near the first wall 111.

[0140] In some embodiments, the battery cell 10 includes an electrode lead-out portion mounted on the first wall 111. The electrode lead-out portion is used to be electrically connected to the electrode assembly 12, so that current flows into or out of the tab 121 through the electrode terminal.

[0141] In some embodiments, the battery cell 10 may include two electrode leads with opposite polarities, the two electrode leads being a first electrode lead 13 and a second electrode lead 14, one of which is a positive electrode lead for electrical connection with a positive electrode, and the other is a negative electrode lead for electrical connection with a negative electrode.

[0142] This application uses the first electrode lead-out portion 13 as an example for illustration.

[0143] In some embodiments of this application, the first electrode lead-out portion 13 includes a conductive element 130 and an electrode terminal 13a. The conductive element 130 is disposed on the outer side of the first wall 111, that is, on the side of the first wall 111 opposite to the electrode assembly 12. The electrode terminal 13a is connected to the conductive element 130, and the portion of the electrode terminal 13a located on the inner side of the first wall 111 is electrically connected to the tab 121 of the electrode assembly 12. The connection relationship between the conductive element 130 and the electrode terminal 13a is varied, including but not limited to riveting, welding, threaded connection, or other connection methods. For example, the conductive element 130 is riveted to the electrode terminal 13a, the conductive element 130 has a riveting hole, and the portion of the electrode terminal 13a passing through the first wall 111 is disposed in the riveting hole.

[0144] In some embodiments, the conductive element 130 is made of a metallic material, such as copper, iron, aluminum, steel, alloy, or composite metal.

[0145] In some embodiments, the electrode terminal 13a is made of a metallic material, such as copper, iron, aluminum, steel, alloy or composite metal.

[0146] Optionally, the material of the electrode terminal 13a and the conductive element 130 can be the same or different. For example, the electrode terminal 13a is made of aluminum, and the conductive element 130 is made of aluminum. Alternatively, the electrode terminal 13a may be made of copper, and the conductive element 130 may be made of aluminum.

[0147] The conductive element 130 is used to connect to the external busbar 30, such as by welding, riveting or threaded connection.

[0148] In some embodiments, the conductive element 130 has a connecting portion 1301, which is a part of the conductive element 130 for connecting with the busbar 30. The conductive element 130 is welded to the busbar 30 through the connecting portion 1301, thereby enabling the input and output of electrical energy.

[0149] Optionally, the conductive component 130 includes a body and a connecting portion 1301. The body is connected to the first pole post 131, and the connecting portion 1301 is welded to the busbar component 30.

[0150] "Electrode terminal 13a is electrically connected to electrode assembly 12" can be understood as electrode terminal 13a being electrically connected to tab 121 of electrode assembly 12. The electrode terminal 13a and tab 121 can be directly connected or indirectly connected. For example, electrode terminal 13a and tab 121 are directly soldered. For example, the first tab 121 is connected to the other tab 121 via an adapter, with one end of the adapter soldered to electrode terminal 13a and the other end soldered to tab 121.

[0151] The first insulating member 15 is an insulating structure used to insulate and isolate the conductive member 130 and the first wall 111. Optionally, the first insulating member 15 can be made of plastic.

[0152] Optionally, the first insulating member 15 may be entirely located between the conductive member 130 and the first wall 111. Optionally, a portion of the first insulating member 15 may be located between the conductive member 130 and the first wall 111, and another portion of the first insulating member 15 may surround the outer peripheral surface of the conductive member 130. Exemplarily, the first insulating member 15 includes a bottom wall 152 and a peripheral wall 153, with the bottom wall 152 located between the conductive member 130 and the first wall 111, and the peripheral wall 153 surrounding the outer peripheral surface of the conductive member 130.

[0153] In some embodiments, the first insulating member 15 has a first through hole 150 through which the first pole post 131 passes so that the first pole post 131 is connected to the conductive member 130.

[0154] Please see Figures 8-10 , Figure 10 for Figure 8 Enlarged view at point A. Along the thickness direction z of the first wall, a gap 17 is formed between the conductive member 130 and the first insulating member 15. Optionally, a gap 17 is formed between the connecting portion 1301 of the conductive member 130 and the first insulating member 15.

[0155] Gap 17 can be understood as at least a portion of the conductive element 130 not contacting the first insulating element 15, but rather a certain distance existing between them. (See also...) Figure 9 The connecting part 1301 is welded to the busbar component 30, and the area where the two are welded forms a weld mark 31. Along the thickness direction z of the first wall, the weld mark 31 is positioned opposite to the gap 17.

[0156] Optionally, in some embodiments, a recess 13010 is formed on the side of the conductive member 130 facing the first wall 111, and a gap 17 is formed between the recess 13010 and the first insulating member 15. In these embodiments, on the same projection plane perpendicular to the thickness direction z of the first wall, the projection of the solder mark 31 at least partially overlaps with the projection of the solder mark 31.

[0157] Optionally, in some embodiments, the side of the first insulating member 15 facing the conductive member 130 is recessed toward the electrode assembly 12, so that a gap 17 is formed between the first insulating member 15 and the conductive member 130. In these embodiments, on the same projection plane perpendicular to the thickness direction z of the first wall, the projection of the solder mark 31 at least partially overlaps with the projection of the recessed portion of the first insulating member 15.

[0158] Optionally, the battery cell 10 further includes a second insulating member 16 disposed between the electrode assembly 12 and the first wall 111. In some embodiments, a portion of the second insulating member 16 is located between the electrode terminal 13a and the first wall 111, serving to insulate and isolate the electrode terminal 13a and the first wall 111.

[0159] In the above scheme, the conductive component 130 and the first insulating component 15 form a gap 17, which can reduce the risk of the first insulating component 15 melting due to welding of the current-connecting component 30 and the conductive component 130 together, and ensure the structural integrity of the first insulating component 15 to a certain extent, thereby improving the reliability of the battery cell 10 and thus improving the reliability of the battery device 100.

[0160] According to some embodiments of this application, along the thickness direction z of the first wall, the maximum size of the gap 17 is not less than 0.05 mm and not greater than 1 mm.

[0161] Along the thickness direction z of the first wall, the size of the gap 17 can be the distance between the connecting part 1301 and the first insulating member 15, and the maximum size of the gap 17 can be the maximum distance between the connecting part 1301 and the first insulating member 15.

[0162] Please see Figure 9 Along the thickness direction z of the first wall, the maximum dimension h of the gap 17 can be 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.1mm...0.98mm, 0.99mm, 1mm or any value between two adjacent values.

[0163] In the above scheme, by setting the size of the gap 17 to not less than 0.05mm along the thickness direction z of the first wall, the influence of the high temperature generated during the welding of the current collector 30 and the conductive component 130 on the first insulating component 15 can be effectively reduced, thus ensuring the structural integrity of the first insulating component 15 to a certain extent and improving the reliability of the battery device 100. By setting the size of the gap 17 to not more than 1mm, the risk of the conductive component 130 occupying too much space along the thickness direction z of the first wall due to the setting of the gap 17 can be reduced, thus reducing the volumetric energy density of the battery cell 10, and enabling the battery device 100 to have a higher volumetric energy density.

[0164] According to some embodiments of this application, please refer to Figure 5 Electrode terminal 13a includes a first terminal 131 and a second terminal 132. The second terminal 132 is connected to the conductive element 130 and is electrically connected to the electrode assembly 12. The first terminal 131 and the second terminal 132 are arranged at intervals along a first direction x, which is perpendicular to the thickness direction z of the first wall. Along the first direction x, a gap 17 is located between the first terminal 131 and the second terminal 132.

[0165] The electrode terminal 13a includes a first electrode post 131 and a second electrode post 132. The first electrode post 131 and the second electrode post 132 are respectively connected to the conductive element 130 and respectively electrically connected to the electrode assembly 12.

[0166] The first electrode post 131 is connected to the conductive element 130, and the portion of the first electrode post 131 located inside the first wall 111 is electrically connected to the tab 121 of the electrode assembly 12. The connection between the first electrode post 131 and the conductive element 130 can be varied, including but not limited to riveting, welding, threaded connection, or other connection methods. The first electrode post 131 and the tab 121 of the electrode assembly 12 can be directly connected or spaced apart. For example, the first electrode post 131 and the tab 121 are directly welded. For example, the first electrode post 131 and the tab 121 are connected via an adapter, with one end of the adapter welded to the first electrode post 131 and the other end welded to the tab 121.

[0167] The second electrode post 132 is connected to the conductive element 130, and the portion of the second electrode post 132 located inside the first wall 111 is electrically connected to the tab 121 of the electrode assembly 12. The connection between the second electrode post 132 and the conductive element 130 can be varied, including but not limited to riveting, welding, threaded connection, or other connection methods. The second electrode post 132 and the tab 121 of the electrode assembly 12 can be directly connected or spaced apart. For example, the second electrode post 132 and the tab 121 are directly welded. For example, the second electrode post 132 and the tab 121 are connected via an adapter, with one end of the adapter welded to the second electrode post 132 and the other end welded to the tab 121.

[0168] Please see Figure 5 The first pole post 131 and the second pole post 132 are arranged at intervals along a first direction x, which is perpendicular to the thickness direction z of the first wall. For example, the first direction x can be the length direction of the first wall 111.

[0169] Optionally, some embodiments of this application propose a first direction x, a second direction y, and a thickness direction z of the first wall, wherein the first direction x, the second direction y, and the thickness direction z of the first wall are mutually perpendicular. The first direction x can be the length direction of the first wall, or it can be parallel to the length direction of the battery cell 10; the second direction y can be the width direction of the first wall, or it can be parallel to 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.

[0170] For example, the conductive element 130 is riveted to the first pole 131 and the second pole 132 respectively. The conductive element 130 has a first riveting hole 13000 and a second riveting hole 13020. The first riveting hole 13000 and the second riveting hole 13020 are arranged at intervals along a first direction x. The first pole 131 passes through the first wall 111 and is disposed in the first riveting hole 13000. The second pole 132 passes through the first wall 111 and is disposed in the second riveting hole 13020.

[0171] Optionally, the first terminal 131 and the second terminal 132 can be electrically connected to the tab 121, respectively. Alternatively, please refer to... Figure 5 The first pole 131 and the second pole 132 are connected by a connector 133. The connector 133 is electrically connected to the tab 121. For example, the connector 133 is welded to the tab 121, or the connector 133 is connected to the tab 121 through an adapter.

[0172] In some embodiments, a second insulating member 16 is provided between the connector 133 and the first wall 111.

[0173] In some embodiments, the first wall 111 has a first perforation through which the first pole post 131 passes, and a seal 18 is provided between the wall of the first perforation and the first pole post 131.

[0174] In some embodiments, the first wall 111 has a second perforation through which the second pole post 132 passes, and a seal 18 is provided between the wall of the second perforation and the second pole post 132.

[0175] Optionally, the seal 18 can be made of insulating material. The seal 18 can be a sealing ring structure.

[0176] "Along the first direction x, the gap 17 is located between the first pole 131 and the second pole 132" can be understood as the connection part 1301 being located between the first pole 131 and the second pole 132 along the first direction x, or it can be understood as the part where the conductive part 130 is welded to the busbar 30 being located between the first pole 131 and the second pole 132.

[0177] In the above scheme, the conductive component 130 is electrically connected to the electrode assembly 12 through the first terminal 131 and the second terminal 132. On the one hand, it can effectively improve the overcurrent capacity of the battery cell 10, which is beneficial to the improvement of the charging and discharging performance of the battery cell 10. On the other hand, it can effectively improve the connection strength between the conductive component 130 and the first wall 111, reduce the risk of the conductive component 130 and the first wall 111 separating due to external impact or internal expansion of the battery cell 10, and ensure the structural stability of the battery cell 10 to a certain extent, so that the battery cell 10 has high reliability, and thus the battery device 100 has high reliability.

[0178] Optionally, the second electrode lead-out portion 14 is similar to the first electrode lead-out portion 13. Described with respect to the second electrode lead-out portion 14, the second electrode lead-out portion includes a conductive element 130 and an electrode terminal 13a. The conductive element 130 is disposed on the outer side of the first wall 111, that is, on the side of the first wall 111 opposite to the electrode assembly 12. The electrode terminal 13a is connected to the conductive element 130, and the portion of the electrode terminal 13a located inside the first wall 111 is electrically connected to the tab 121 of the electrode assembly 12. The connection relationship between the conductive element 130 and the electrode terminal 13a is varied, including but not limited to riveting, welding, threaded connection, or other connection methods. For example, the conductive element 130 is riveted to the electrode terminal 13a, the conductive element 130 has a riveting hole, and the portion of the electrode terminal 13a passing through the first wall 111 is disposed in the riveting hole. In some embodiments, the material of the electrode terminal 13a of the first electrode lead-out portion 13 is different from the material of the electrode terminal 13a of the second electrode lead-out portion 14, for example, one is aluminum and the other is copper. In some embodiments, the material of the conductive element 130 of the first electrode lead-out portion 13 is different from the material of the conductive element 130 of the second electrode lead-out portion 14, for example, one is an aluminum-copper composite metal and the other is aluminum.

[0179] Optionally, a gap 17 is formed between the conductive element 130 of the second electrode lead-out portion 14 and the first insulating element 15 along the thickness direction z of the first wall. For example, the conductive element 130 of the second electrode lead-out portion 14 is welded to an external busbar component, and the welding position corresponds to the gap 17. By providing the gap 17, the risk of the first insulating element 15 melting due to welding between the busbar component 30 and the conductive element 130 of the second electrode lead-out portion 14 can be reduced, ensuring the structural integrity of the first insulating element 15 to a certain extent, thereby improving the reliability of the battery cell 10 and consequently improving the reliability of the battery device 100.

[0180] Optionally, the electrode terminal 13a of the second electrode lead-out portion 14 includes two posts, such as a first post 131 and a second post 132. The second post 132 is connected to the conductive element 130 of the second electrode lead-out portion 14 and is electrically connected to the electrode assembly 12. The first post 131 and the second post 132 are arranged at intervals along a first direction x, which is perpendicular to the thickness direction z of the first wall. Along the first direction x, a gap 17 is located between the first post 131 and the second post 132.

[0181] For example, the electrode terminal 13a of the second electrode lead-out portion 14 includes a pole post that connects the conductive element 130 and the electrode assembly.

[0182] According to some embodiments of this application, please refer to Figure 6Along the first direction x, the conductive element 130 includes a first body 1300, a connecting part 1301 and a second body 1302 connected in sequence. The first pole 131 is connected to the first body 1300, the second pole 132 is connected to the second body 1302, and the connecting part 1301 is located between the first pole 131 and the second pole 132.

[0183] The first body 1300 is connected to the first pole post 131. The connection relationship between the first body 1300 and the first pole post 131 is diverse, including but not limited to riveting, welding, threaded connection or other connection methods. For example, the first body 1300 has a first riveting hole 13000, and the first pole post 131 is riveted into the first riveting hole 13000.

[0184] The second body 1302 is connected to the second pole post 132. The connection relationship between the second body 1302 and the second pole post 132 is diverse, including but not limited to riveting, welding, threaded connection or other connection methods. For example, the second body 1302 has a second riveting hole 13020, and the second pole post 132 is riveted into the second riveting hole 13020.

[0185] The connecting portion 1301 is the part of the conductive element 130 located between the first body 1300 and the second body 1302. In some embodiments, the connecting portion 1301 is welded to the bus component 30.

[0186] Along the first direction x, the connecting portion 1301 is located between the first body 1300 and the second body 1302, and the first body 1300 is connected to the second body 1302 through the connecting portion 1301. The connection relationship between the first body 1300, the connecting portion 1301, and the second body 1302 is diverse, including but not limited to integral molding, welding, riveting, threaded connection, etc. For example, the conductive element 130 is an integrally molded structure.

[0187] In the above scheme, the first terminal 131 is connected to the first body 1300, and the second terminal 132 is connected to the second body 1302. This reduces the interference of the connection portion 1301 between the terminal and the conductive component 130 on the busbar component 30. On the one hand, it allows the conductive component 130 to have a larger connection area to connect with the busbar component 30, which effectively improves the overcurrent capacity of the battery device 100 at the battery device 100 level, resulting in high charge and discharge performance of the battery device 100. On the other hand, it allows a gap 17 of suitable size to be formed between the conductive component 130 and the first insulating component 15, thereby effectively reducing the risk of the first insulating component 15 melting due to welding of the busbar component 30 and the conductive component 130, resulting in higher reliability of the battery cell 10, and thus higher reliability of the battery device 100.

[0188] According to some embodiments of this application, the location of the maximum size of the gap 17 corresponds to the middle part of the connection portion 1301 along the first direction x.

[0189] In some embodiments, the distance between the connecting portion 1301 and the first insulating member 15 is greatest along the first direction x, corresponding to the position where the middle portion of the connecting portion 1301 is located. The size of the gap 17 can be understood as the size along the thickness direction of the first wall.

[0190] Optionally, along the first direction x, corresponding to other parts of the connecting portion 1301, the size of the gap 17 may be smaller than the size corresponding to the middle portion.

[0191] Optionally, along the first direction x, corresponding to other parts of the connecting portion 1301, the size of the gap 17 may vary and be less than or equal to the size corresponding to the middle portion.

[0192] In the above scheme, the connecting part 1301 is used to weld with the external busbar component 30. By setting the maximum size of the gap 17 at the middle of the connecting part 1301 along the first direction x, the risk of the first insulating component 15 melting can be effectively reduced, which is beneficial to improving the reliability of the battery cell 10.

[0193] According to some embodiments of this application, the size of the gap 17 gradually decreases from the middle of the connecting portion 1301 along the first direction x to both ends of the connecting portion 1301.

[0194] Optionally, corresponding to the position where the middle part of the connecting part 1301 is located, the distance between the connecting part 1301 and the first insulating member 15 is the largest and points to both ends of the connecting part 1301, and the distance between the connecting part 1301 and the first insulating member 15 gradually decreases.

[0195] Optionally, a recess 13010 is formed on the side of the connecting portion 1301 facing the first insulating member 15. The wall surface of the recess 13010 is an arc surface so that the size of the middle part of the gap 17 is the largest, and the size of the gap 17 gradually decreases from the middle part of the connecting portion 1301 to both ends of the connecting portion 1301.

[0196] Optionally, the side of the first insulating member 15 facing the connection portion 1301 is recessed toward the electrode assembly 12. The wall of the recessed portion is an arc surface, so that the size of the middle part of the gap 17 is the largest and points to both ends of the connection portion 1301, and the size of the gap 17 gradually decreases.

[0197] In the above scheme, the gap 17 is arched, with a large size in the middle and small sizes at both ends. On the one hand, the larger size in the middle can effectively reduce the risk of the first insulating component 15 melting due to the welding of the current-collecting component 30 and the conductive component 130, which is beneficial to improving the reliability of the battery cell 10. On the other hand, the smaller size at both ends can reduce the risk of the conductive component 130 occupying too much space due to the setting of the gap 17, which would affect the volumetric energy density of the battery cell 10.

[0198] According to some embodiments of this application, along the thickness direction z of the first wall, a recess 13010 is formed on the side of the conductive member 130 facing the first wall 111, and a gap 17 is formed between the wall surface of the recess 13010 and the first insulating member 15.

[0199] Please see Figure 10 and Figure 11 , Figure 11 This is a schematic diagram of the conductive element 130 in some embodiments of this application.

[0200] In some embodiments, along the thickness direction z of the first wall, the side of the conductive member 130 facing the first wall 111 is the inner side of the connecting portion 1301. A recess 13010 is formed on the inner side of the conductive member 130, which is recessed toward the outer side of the connecting portion 1301, thereby forming a gap 17 between the inner side of the conductive member 130 and the first insulating member 15.

[0201] Optionally, the portion where the recess 13010 is located corresponds to the connecting portion 1301. For example, the recess 13010 is located inside the connecting portion 1301. For example, a portion of the recess 13010 is located inside the connecting portion 1301, and other portions of the recess 13010 are located at other portions of the conductive member 130.

[0202] Optionally, the wall surface of the recess 13010 can be a plane. Optionally, the wall surface of the recess 13010 can be a curved surface.

[0203] In the above scheme, by forming a recess 13010 on the side of the conductive member 130 facing the first wall 111, the formation of the gap 17 is less difficult, which is conducive to improving the manufacturing efficiency of the battery cell 10.

[0204] According to some embodiments of this application, the wall surface of the recess 13010 is an arc surface.

[0205] Please see Figure 10 and Figure 11 , Figure 11 This is a schematic diagram of the conductive element 130 in some embodiments of this application.

[0206] The wall surface of the recess 13010 can be understood as at least a portion of the surface of the conductive member 130 facing the first insulating member 15. The fact that the wall surface of the recess 13010 is an arc surface can be understood as the surface that forms the gap 17 between the conductive member 130 and the first insulating member 15 being an arc surface. The distance between the middle part of the arc surface and the first insulating member 15 is the maximum size of the gap 17. Along the first direction x, the middle part of the arc surface points towards the end of the arc surface, and the size of the gap 17 gradually decreases.

[0207] In the above solution, by setting the wall surface of the recess 13010 as an arc surface, on the one hand, the molding difficulty of the recess 13010 can be reduced (for example, the recess 13010 is formed due to the bending of the conductive component 130), which makes the manufacturing efficiency of the battery cell 10 high and is conducive to improving the manufacturing efficiency of the battery device 100; on the other hand, the arched shape of the wall surface of the recess 13010 makes the middle size of the gap 17 large, which can effectively reduce the risk of the first insulating component 15 melting due to the welding of the current-connecting component 30 and the conductive component 130, which is conducive to improving the reliability of the battery cell 10; the smaller size of the two ends of the gap 17 can reduce the risk that the conductive component 130 occupies too much space due to the setting of the gap 17, which affects the volumetric energy density of the battery cell 10.

[0208] According to some embodiments of this application, along the first direction x, the distance between the first pole post 131 and the second pole post 132 is L, and the size of the recess 13010 is s, satisfying 0.5L≤s≤L.

[0209] Please see Figure 8 and Figure 11 Along the first direction x, the distance L between the first pole post 131 and the second pole post 132 is the minimum distance between the first pole post 131 and the second pole post 132. Along the first direction x, the dimension s of the recess 13010 can be understood as the dimension of the gap 17 along the first direction x.

[0210] In some embodiments, along the first direction x, the relationship between the distance L between the first pole post 131 and the second pole post 132 and the size s of the recess 13010 satisfies 0.5L≤s≤L, that is, the value of s is 0.5L, 0.6L, 0.7L, 0.8L, 0.9L, L or any value between two adjacent values, such as 0.55L.

[0211] In the above scheme, by setting the size of the gap 17 to be greater than or equal to half the distance between the first electrode post 131 and the second electrode post 132 along the first direction x, the gap 17 can effectively reduce the risk of structural damage to the first insulating component 15 caused by the high temperature generated by the welding of the current-conducting component 30 and the conductive component 130. By setting the size of the gap 17 to be no greater than the distance between the first electrode post 131 and the second electrode post 132, the risk of reduced assembly strength between the conductive component 130 and the first wall 111 due to the setting of the recess 13010 can be reduced, resulting in high structural stability of the battery cell 10 and thus high reliability of the battery device 100.

[0212] According to some other embodiments of this application, a recess is formed on the side of the first insulating member 15 facing the conductive member 130 along the thickness direction z of the first wall, and a gap 17 is formed between the wall surface of the recess and the conductive member 130.

[0213] Optionally, a recess is formed on the outer side of the first insulating member 15, and a gap 17 is formed between the wall of the recess and the conductive member 130.

[0214] Optionally, a recess 13010 is formed on the inner side of the conductive member 130, and the portion of the first insulating member 15 corresponding to the recess 13010 is also recessed, thereby forming a gap 17 together.

[0215] According to some embodiments of this application, along the thickness direction z of the first wall, the first body 1300 has a first surface 13001 opposite to the first wall 111, the second body 1302 has a second surface 13021 opposite to the first wall 111, and the connecting portion 1301 protrudes from the first surface 13001 and the second surface 13021.

[0216] Please see Figure 6 and Figure 11 Along the direction of the electrode assembly 12 pointing to the first wall 111, the connecting portion 1301 arches relative to the first body 1300 and the second body 1302, so that the connecting portion 1301 protrudes from the first surface 13001 and the second surface 13021 on the side away from the first insulating member 15, and a recess 13010 is formed on the side of the connecting portion 1301 facing the first insulating member 15.

[0217] Optionally, the first surface 13001 is the outer surface of the first body 1300, and the first surface 13001 can be a plane. The second surface 13021 is the outer surface of the second body 1302, and the second surface 13021 can be a plane. The outer surface of the connecting portion 1301 can be an arc surface, which can correspond to the wall surface of the recess 13010.

[0218] In the above solution, by setting the connecting portion 1301 to protrude from the first surface 13001 and the second surface 13021, on the one hand, the formation of the recess 13010 is easier, thereby making it easier to form a gap 17 between the connecting portion 1301 and the first insulating member 15. This reduces the impact of the heat generated during welding on the first insulating member 15, which is beneficial to improving the reliability of the battery cell 10, and thus to improving the reliability of the battery device 100. On the other hand, the outward protrusion of the connecting portion 1301 allows the current-carrying member 30 to effectively fit against the connecting portion 1301 under external force when the connecting portion 1301 is welded to the current-carrying member 30, thereby reducing the welding difficulty.

[0219] According to some embodiments of this application, along the thickness direction z of the first wall, the connecting portion 1301 protrudes from the first surface 13001 and the second surface 13021 by an amount not greater than 1 mm.

[0220] Please see Figure 11 The outer surface of the connecting portion 1301 protrudes from the first surface 13001 and the second surface 13021. Optionally, the dimension by which the outer surface of the connecting portion 1301 protrudes from the second surface 13021 along the thickness direction z of the first wall is t, where t is a value greater than 0 and less than or equal to 1 mm, such as 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.1 mm...0.98 mm, 0.99 mm, 1 mm, etc.

[0221] Optionally, the plane containing the first surface 13001 and the plane containing the second surface 13021 are the same plane. Optionally, the plane containing the first surface 13001 and the plane containing the second surface 13021 are not the same plane.

[0222] In the above solution, by setting the size of the connecting part 1301 protruding from the first surface 13001 and the second surface 13021 to no more than 1 mm, the space occupied by the connecting part 1301 in the thickness direction z of the battery cell 10 can be reduced, 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.

[0223] According to some embodiments of this application, along the thickness direction z of the first wall, the side of the first body 1300 facing the first wall 111 contacts the first insulating member 15; and / or, the side of the second body 1302 facing the first wall 111 contacts the first insulating member 15.

[0224] In some embodiments, the side of the first body 1300 facing the first wall 111 is the inner side of the first body 1300, and the inner side of the first body 1300 is in contact with the first insulating member 15. In some embodiments, the side of the second body 1302 facing the first wall 111 is the inner side of the second body 1302, and the inner side of the second body 1302 is in contact with the first insulating member 15.

[0225] In the above solution, by connecting the first body 1300 and / or the second body 1302 to the first insulating member 15, the assembly strength between the conductive member 130, the first insulating member 15 and the first wall 111 is high, the risk of separation between the conductive member 130, the first insulating member 15 and the first wall 111 is reduced, the reliability of the battery cell 10 is high, and thus the reliability of the battery device 100 is high.

[0226] In some other embodiments, a partial gap 17 exists between the inner surface of the first body 1300 and the first insulating member 15. A partial gap 17 also exists between the inner surface of the second body 1302 and the first insulating member 15.

[0227] According to some embodiments of this application, the first insulating member 15 has a first through hole 150 and a second through hole 151, a first pole post 131 passes through the first through hole 150, and a second pole post 132 passes through the second through hole 151.

[0228] Please see Figure 6 The first insulating member 15 has a through hole 150 and a through hole 151, which are arranged at intervals along a first direction x. A first electrode post 131 passes through the first through hole 150 and is connected to the conductive member 130, and a second electrode post 132 passes through the second through hole 151 and is connected to the conductive member 130.

[0229] In some embodiments, the first through hole 150 may be coaxially arranged with the first riveting hole 13000, and the second through hole 151 may be coaxially arranged with the second riveting hole 13020.

[0230] In other embodiments, the central axis of the first through hole 150 and the central axis of the first riveting hole 13000 are spaced apart from each other along a first direction x.

[0231] In other embodiments, the central axis of the second through hole 151 and the central axis of the second riveting hole 13020 are spaced apart from each other along the first direction x.

[0232] In the above solution, by providing a first through hole 150 for the first terminal 131 to pass through and connect to the conductive component 130, and by providing a second through hole 151 for the second terminal 132 to pass through and connect to the conductive component 130, the risk of interference between the first insulating component 15 and the first terminal 131 and the second terminal 132 is reduced, and the risk of structural damage to the first insulating component 15 during the assembly of the battery cell 10 is reduced, so that the battery cell 10 has high reliability.

[0233] According to some embodiments of this application, the first insulating member 15 includes a bottom wall 152 and a peripheral wall 153. The bottom wall 152 is located between the conductive member 130 and the first wall 111, and at least a portion of the peripheral wall 153 surrounds the outer peripheral surface of the conductive member 130. A first through hole 150 and a second through hole 151 are formed in the bottom wall 152.

[0234] Please combine Figure 6 and Figure 7 The first insulating member 15 includes a bottom wall 152 and a peripheral wall 153. The bottom wall 152 is located between the conductive member 130 and the first wall 111. A first through hole 150 and a second through hole 151 are formed on the bottom wall 152 to allow the first pole post 131 and the second pole post 132 to pass through and connect with the conductive member 130, respectively. The peripheral wall 153 surrounds the edge of the bottom wall 152, and the peripheral wall 153 and the bottom wall 152 together form a groove that accommodates the conductive member 130. The peripheral wall 153 covers at least a portion of the outer peripheral surface of the conductive member 130.

[0235] In the above scheme, the bottom wall 152 of the first insulating member 15 is disposed between the conductive member 130 and the first wall 111, and the peripheral wall 153 surrounds the outer peripheral surface of the conductive member 130. This enables the creepage distance between the conductive member 130 and the first wall 111 to be large, effectively insulating and isolating the conductive member 130 and the first wall 111, reducing the risk of internal short circuit in the battery cell 10, and making the battery device 100 highly reliable.

[0236] According to some embodiments of this application, see Figure 5 The battery cell 10 also includes a connector 133, which is disposed on the inner side of the first wall 111 and connects the first terminal 131 and the second terminal 132. The first terminal 131, the connector 133, and the second terminal 132 are integrally formed.

[0237] The connector 133 is located inside the first wall 111 and connects the first pole post 131 and the second pole post 132.

[0238] In some embodiments, the connector 133 is made of a conductive material, and the tabs 121 of the electrode assembly 12 are directly or indirectly connected through the connector 133 to achieve electrical connection with the conductive component 130.

[0239] Optionally, the side of the connector 133 facing the electrode assembly 12 is connected to the tab 121, and the first pole post 131 and the second pole post 132 are disposed on the side of the connector 133 opposite to the electrode assembly 12.

[0240] In some embodiments, the first pole post 131, the connector 133, and the second pole post 132 are integrally formed by processes such as casting and die casting.

[0241] In the above scheme, the first terminal 131 and the second terminal 132 are connected by the connector 133. On the one hand, this allows the first terminal 131 and the second terminal 132 to be electrically connected to the electrode assembly 12, improving the overcurrent capacity of the battery cell 10 and thus enhancing its charge and discharge performance. On the other hand, it improves the assembly quality between the conductive component 130 and the first wall 111, reducing the risk of separation between the conductive component 130 and the first wall 111, resulting in high reliability of the battery cell 10. Furthermore, the first terminal 131, the connector 133, and the second terminal 132 are integrally formed, providing high structural strength and improving the structural stability of the battery cell 10, thereby enhancing its reliability.

[0242] According to some embodiments of this application, please refer to Figure 12 , Figure 12 This is a perspective view of a battery cell 10 in some embodiments of this application.

[0243] 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 3720cm. 3 ≤W1*T1*H1≤12500cm 3 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 mutually perpendicular.

[0244] 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 the height direction of the battery cell 10.

[0245] 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.

[0246] 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: 3720cm3 ≤W1*T1*H1≤12500cm 3 , 60mm≤T1≤150mm, 120mm≤H1≤400mm, 200mm≤W1≤1500mm.

[0247] 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.

[0248] 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.

[0249] 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.

[0250] 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 200mm, 210mm, 220mm, 230mm, 240mm...1360mm, 1370mm, 1380mm, 1390mm, 1400mm or any value between two adjacent values.

[0251] 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, by setting a gap 17 between the conductive member 130 and the first insulating member 15, the structural integrity of the first insulating member 15 can be guaranteed to a certain extent, resulting in high insulation performance of the battery cell 10, thereby reducing the risk of internal short circuits in the battery cell 10, thus making the battery cell 10 with a larger capacity more reliable, and consequently making the battery device 100 with such a battery cell 10 more reliable.

[0252] According to some embodiments of this application, the outer casing 11 is a steel casing.

[0253] 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.

[0254] Some embodiments of this application provide a battery device 100, which includes a current-combining component 30 and a battery cell 10 as described above. The current-combining component 30 is connected to a conductive element 130 via solder 31.

[0255] Optionally, the connection portion 1301 between the busbar 30 and the conductive element 130 is connected by solder 31.

[0256] See Figure 3 As shown, the battery device 100 may also include a housing 20, in which the battery cells 10 are housed.

[0257] 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.

[0258] 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.

[0259] 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.

[0260] Optionally, there may be multiple battery cells 10 disposed within the housing 20. For example, in... Figure 3 In the battery device 100, multiple battery cells 10 are installed inside the housing 20. These battery cells 10 are connected in series, parallel, or in a mixed configuration via a busbar 30. 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 via the busbar 30, and then the entire assembly of the multiple battery cells 10 is housed inside 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 a battery module, and then the multiple battery modules are connected in series, parallel, or in a mixed configuration to form a whole, which is also housed inside the housing 20.

[0261] 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 through a busbar 30, 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.

[0262] In the above scheme, the connecting part 1301 is welded to the busbar component 30 so that the battery cells 10 have a highly reliable electrical connection structure, which is beneficial to improving the charging and discharging performance of the battery device 100. At the same time, a gap 17 is formed between the conductive component 130 and the first insulating component 15, which can reduce the risk of the first insulating component 15 melting due to the welding of the busbar component 30 and the conductive component 130, and ensure the structural integrity of the first insulating component 15 to a certain extent, thereby improving the reliability of the battery cells 10 and thus improving the reliability of the battery device 100.

[0263] Some embodiments of this application provide an energy storage device 2000, which includes the battery cell 10 and / or battery device 100 described above.

[0264] 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 connected in series, parallel, or in a mixed connection through a busbar component 30.

[0265] Optionally, a battery device 100 may also be installed inside the cabinet 2001.

[0266] Some embodiments of this application provide an electrical device 1000, which includes the battery cell 10 and / or battery device 100 described above.

[0267] 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.

[0268] Some embodiments of this application also provide a battery cell 10, please refer to [link to relevant documentation]. Figures 4-11 .

[0269] The battery cell 10 includes a casing 11, an electrode assembly 12, a first electrode lead-out portion 13, a second electrode lead-out portion 14, and a first insulating member 15. The second electrode lead-out portion 14 has the opposite polarity to the first electrode lead-out portion 13; one is used to connect to the positive electrode tab of the electrode assembly 12, and the other is used to connect to the negative electrode tab of the electrode assembly 12.

[0270] Exemplarily, the first electrode lead-out portion 13 includes a conductive element 130 and an electrode terminal 13a. The electrode terminal 13a includes two posts, namely a first post 131 and a second post 132. The housing 11 has a first wall 111. The electrode assembly 12 is disposed within the housing 11. The conductive element 130 is disposed on the outer side of the first wall 111. The first insulating element 15 is at least partially disposed between the conductive element 130 and the first wall 111.

[0271] The first electrode post 131 and the second electrode post 132 are arranged at intervals along a first direction x, which is perpendicular to the thickness direction z of the first wall. The first electrode post 131 and the second electrode post 132 are respectively connected to the conductive element 130.

[0272] Optionally, along the first direction x, the conductive element 130 includes a first body 1300, a connecting portion 1301, and a second body 1302 connected in sequence. The first body 1300 has a first riveting hole 13000, and the second body 1302 has a second riveting hole 13020. The connecting portion 1301 is used for welding to the busbar component 30.

[0273] The first insulating member 15 has a first through hole 150 and a second through hole 151, which are arranged at intervals along a first direction x. The first pole post 131 passes through the first wall 111 and the first through hole 150 and is disposed in the first riveting hole 13000, and the second pole post 132 passes through the first wall 111 and the second through hole 151 and is disposed in the second riveting hole 13020.

[0274] The portion of the first electrode post 131 located inside the first wall 111 and the portion of the second electrode post 132 located inside the first wall 111 are connected by a connector 133, and the connector 133 is electrically connected to the tab 121 of the electrode assembly 12.

[0275] Along the direction of the electrode assembly 12 pointing towards the first wall 111, the connecting portion 1301 arches relative to the first body 1300 and the second body 1302, such that a recess 13010 is formed on the inner side of the connecting portion 1301, and the outer side of the connecting portion 1301 protrudes from the first surface 13001 of the first body 1300 and the second surface 13021 of the second body 1302. The wall surface of the recess 13010 is an arc surface, and a gap 17 is formed between the arc surface and the first insulating member 15. The maximum dimension h of the gap 17 can be 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.1mm...0.98mm, 0.99mm, 1mm or any value between two adjacent values.

[0276] Optionally, the second electrode lead-out portion 14 has a similar structure to the first electrode lead-out portion 13. For example, the second electrode lead-out portion 14 includes a conductive element 130 and an electrode terminal 13a, with the conductive element 130 disposed on the outer side of the first wall 111. The first insulating element 15 is at least partially disposed between the conductive element 130 and the first wall 111. Exemplarily, the electrode terminal 13a of the second electrode lead-out portion 14 may include one or more terminals. The conductive element 130 of the second electrode lead-out portion 14 is connected to the electrode assembly through one or more terminals.

[0277] Optionally, a gap 17 is formed between the conductive element 130 of the second electrode lead-out portion 14 and the first insulating element 15.

[0278] In the above scheme, a gap 17 is formed between the conductive component 130 and the first insulating component 15, which can reduce the risk of the first insulating component 15 melting due to welding of the current bus 30 and the conductive component 130 together, and ensure the structural integrity of the first insulating component 15 to a certain extent, thereby improving the reliability of the battery cell 10 and thus improving the reliability of the battery device 100.

[0279] 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 in that, include: The outer shell has a first wall; Electrode assembly, disposed within the housing; A conductive element is disposed on the outer side of the first wall; The electrode terminal is connected to the conductive element, and the electrode terminal is electrically connected to the electrode assembly; A first insulating element is at least partially disposed between the conductive element and the first wall; Along the thickness direction of the first wall, a gap is formed between the conductive element and the first insulating element.

2. The battery cell according to claim 1, characterized in that, Along the thickness direction of the first wall, the maximum size of the gap is not less than 0.05 mm and not greater than 1 mm.

3. The battery cell according to claim 1 or 2, characterized in that, The electrode terminals further include a first electrode post and a second electrode post; The first electrode post is connected to the conductive element and electrically connected to the electrode assembly; the second electrode post is connected to the conductive element and electrically connected to the electrode assembly; the first electrode post and the second electrode post are arranged at intervals along a first direction, the first direction being perpendicular to the thickness direction of the first wall; Along the first direction, the gap is located between the first pole post and the second pole post.

4. The battery cell according to claim 3, characterized in that, Along the first direction, the conductive element includes a first body, a connecting portion, and a second body connected in sequence. The first electrode post is connected to the first body, the second electrode post is connected to the second body, and the connecting portion is located between the first electrode post and the second electrode post.

5. The battery cell according to claim 4, characterized in that, The location of the maximum size of the gap corresponds to the middle of the connecting portion along the first direction.

6. The battery cell according to claim 5, characterized in that, The size of the gap gradually decreases from the middle of the connecting portion along the first direction to both ends of the connecting portion.

7. The battery cell according to claim 4, characterized in that, Along the thickness direction of the first wall, a recess is formed on the side of the conductive element facing the first wall, and the gap is formed between the wall surface of the recess and the first insulating element.

8. The battery cell according to claim 7, characterized in that, The wall of the recess is an arc surface.

9. The battery cell according to claim 7, characterized in that, Along the first direction, the distance between the first pole post and the second pole post is L, and the size of the recess is s, satisfying 0.5L≤s≤L.

10. The battery cell according to claim 4, characterized in that, Along the thickness direction of the first wall, a recess is formed on the side of the first insulating member facing the conductive member, and the gap is formed between the wall surface of the recess and the conductive member.

11. The battery cell according to claim 4, characterized in that, Along the thickness direction of the first wall, the first body has a first surface opposite to the first wall, the second body has a second surface opposite to the first wall, and the connecting portion protrudes from the first surface and the second surface.

12. The battery cell according to claim 11, characterized in that, Along the thickness direction of the first wall, the connecting portion protrudes from the first surface and the second surface by a dimension not greater than 1 mm.

13. The battery cell according to claim 12, characterized in that, Along the thickness direction of the first wall, the side of the first body facing the first wall contacts the first insulating element; and / or, the side of the second body facing the first wall contacts the first insulating element.

14. The battery cell according to claim 3, characterized in that, The first insulating member has a first through hole and a second through hole, the first pole is inserted through the first through hole, and the second pole is inserted through the second through hole.

15. The battery cell according to claim 14, characterized in that, The first insulating member includes a bottom wall and a peripheral wall, the bottom wall being located between the conductive member and the first wall, and at least a portion of the peripheral wall surrounding the outer peripheral surface of the conductive member; The first through hole and the second through hole are formed in the bottom wall.

16. The battery cell according to claim 3, characterized in that, The battery cell also includes: A connector is disposed on the inner side of the first wall and connects the first pole post and the second pole post; The first pole, the connector, and the second pole are integrally formed.

17. The battery cell according to claim 1, characterized in that, The outer shell is a square shell. The dimension of the outer shell in the first direction is W1, the dimension in the second direction is T1, and the dimension 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 all perpendicular to each other.

18. The battery cell according to claim 1, characterized in that, The outer shell is made of steel.

19. A battery device, characterized in that, include: Busbar components; The battery cell according to any one of claims 1-18, wherein the busbar component and the conductive component are connected by solder.

20. An energy storage device, characterized in that, include: The battery cell according to any one of claims 1-18, and / or the battery device according to claim 19.

21. An electrical appliance, characterized in that, Includes the battery cell according to any one of claims 1-18, and / or the battery device according to claim 19.

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