Battery monomer, battery device and electric device

Abstract

The embodiment of the utility model provides a battery monomer, a battery device and a power utilization device. The battery monomer comprises a shell, an electrode terminal, an electrode assembly and an adapter. The shell comprises a first wall, the first wall is provided with an electrode leading-out hole, and the electrode leading-out hole penetrates through the first wall in the thickness direction of the first wall; the electrode terminal is arranged on the first wall, and a part of the electrode terminal is arranged in the electrode lead-out hole; the electrode assembly is arranged in the shell and is provided with a tab; the adapter is connected with the electrode terminal and the tab, and the tab is provided with a first connecting part connected with the adapter; wherein the electrode terminal protrudes out of the inner surface of the first wall, the first connecting part is located on the side of the electrode terminal in the first direction, on the same projection plane perpendicular to the first direction, the orthographic projection of the first connecting part and the orthographic projection of the electrode terminal are at least partially overlapped, and the first direction is perpendicular to the thickness direction of the first wall. The technical scheme provided by the utility model has relatively high energy density.

Description

Technical Field

[0001] This application relates to the field of battery device technology, and more specifically, to a battery cell, a battery 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] Energy density is a crucial factor in the manufacturing process of battery devices. Therefore, improving the energy density of battery devices is a pressing technical challenge that needs to be addressed. Utility Model Content

[0004] This application provides a battery cell, a battery device, and an electrical device, which have high energy density.

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

[0006] In a first aspect, embodiments of this application provide a battery cell, which includes a housing, electrode terminals, an electrode assembly, and an adapter. The housing includes a first wall with an electrode lead-out hole extending through the first wall along its thickness direction. The electrode terminals are disposed on the first wall, with a portion of the electrode terminals disposed within the electrode lead-out hole. The electrode assembly is disposed within the housing and has tabs. The adapter connects the electrode terminals and the tabs, with the tabs having a first connecting portion that connects to the adapter. The electrode terminals protrude from the inner surface of the first wall, and along a first direction, the first connecting portion is located to the side of the electrode terminals. On the same projection plane perpendicular to the first direction, the orthographic projection of the first connecting portion at least partially overlaps with the orthographic projection of the electrode terminals. The first direction is perpendicular to the thickness direction of the first wall.

[0007] According to the embodiments of this application, in a battery cell, the electrode terminals protrude from the inner surface of the first wall, so that the electrode terminals are disposed more towards the interior of the battery cell. Furthermore, on the same projection plane perpendicular to the first direction, the orthographic projection of the first connection portion and the orthographic projection of the electrode terminals at least partially overlap. The first connection portion can utilize the lateral space of the electrode terminals in the first direction, thereby improving the space utilization rate of the battery cell in the thickness direction of the first wall, and thus enabling the battery cell to have a higher energy density.

[0008] According to some embodiments of this application, along the thickness direction of the first wall, the first connecting portion is located between the adapter and the first wall.

[0009] In the above scheme, by positioning the first connecting part between the adapter and the first wall along the thickness direction of the first wall, the first connecting part is closer to the first wall. By utilizing the bending space of the tab in the thickness direction of the first wall, the space utilization rate inside the battery cell in the thickness direction of the first wall can be improved, which is beneficial to improving the energy density of the battery cell.

[0010] According to some embodiments of this application, the battery cell further includes a first insulating member disposed on the inner side of the first wall. Along the thickness direction of the first wall, at least a portion of the first insulating member is disposed between the first wall and the adapter, and a first connecting portion is located between the first insulating member and the adapter.

[0011] In the above solution, the first insulating member is disposed on the inner side of the first wall, which can separate the adapter and the first wall and reduce the risk of short circuit between the adapter and the first wall; the first connecting part is located between the first insulating member and the adapter, and the first connecting part is separated by the first insulating member, which can reduce the risk of short circuit between the first connecting part and the first wall.

[0012] According to some embodiments of this application, the first insulating member has a first surface facing away from the first wall, and the first connecting portion is located between the first surface and the adapter; the electrode terminal protrudes from the first surface in a direction from the outside to the inside of the first wall.

[0013] In the above scheme, the end of the electrode terminal closer to the inside of the battery cell protrudes from the first surface, so that the electrode terminal is set closer to the inside of the battery cell. The size of the electrode terminal protruding from the outer surface of the first wall is small, which can reduce the overall height of the battery cell and improve the energy density of the battery cell.

[0014] According to some embodiments of this application, the first insulating member includes an insulating member body and an extension portion. Along the thickness direction of the first wall, the insulating member body is disposed between the first wall and the adapter. The extension portion is connected to the insulating member body. In the radial direction of the electrode terminal, at least a portion of the extension portion is located between the hole wall of the electrode lead-out hole and the electrode terminal.

[0015] In the above scheme, the insulating body is disposed between the first wall and the adapter, and at least a portion of the extension is located between the hole wall of the electrode lead-out hole and the electrode terminal, so as to reduce the risk of short circuit between the first wall and the adapter and the electrode terminal, and improve the reliability of the battery cell.

[0016] According to some embodiments of this application, a gap exists between the extension and the electrode terminal in the radial direction of the electrode terminal.

[0017] In the above solution, there is a gap between the extension and the electrode terminal, which facilitates the assembly of the electrode terminal and the first wall. At the same time, it can reduce the impact of the high temperature during the welding of the electrode terminal and the adapter on the extension, thereby improving the reliability of the battery cell.

[0018] According to some embodiments of this application, the adapter is welded to the electrode terminal to form a first weld mark; along the thickness direction of the first wall, the penetration depth of the portion of the first weld mark located at the electrode terminal is M, satisfying 0.05mm≤M≤2mm.

[0019] In the above scheme, the adapter is welded to the electrode terminal, so that the adapter and the electrode terminal are firmly connected; the penetration depth M of the first solder mark located on the electrode terminal along the thickness direction of the first wall satisfies the above relationship (0.05mm≤M≤2mm). Under the condition of meeting the reliability requirements of the connection between the adapter and the electrode terminal, the energy consumption during the welding of the adapter and the electrode terminal is low.

[0020] According to some embodiments of this application, 0.2mm ≤ M ≤ 1mm.

[0021] In the above scheme, when M≥0.2mm, the connection reliability between the adapter and the electrode terminal is further improved; when M≤1mm, the energy consumption during welding of the adapter and the electrode terminal is further reduced.

[0022] According to some embodiments of this application, the adapter includes an adapter body and a protrusion. The adapter body includes a second surface facing the first wall, the protrusion protrudes from the second surface, a first connecting portion is connected to the second surface, and an electrode terminal is connected to the protrusion.

[0023] In the above scheme, the protrusion protrudes from the second surface to facilitate the connection between the adapter and the electrode terminal. Meanwhile, the first connection part is located on the side of the protrusion along the first direction, which can utilize the space inside the battery cell in the thickness direction of the first wall, thereby improving the energy density of the battery cell.

[0024] According to some embodiments of this application, the adapter has a recess on the side opposite to the first wall that corresponds to the position of the protrusion.

[0025] In the above scheme, the recessed part allows the adapter to be formed by stamping, which is convenient for processing and manufacturing, and the weight of the adapter can be lighter, which helps to reduce the overall weight of the battery cell. When the adapter is formed with protrusions and recesses by stamping, the adapter can have high overall strength, which makes the connection between the adapter and the electrode terminal more reliable.

[0026] According to some embodiments of this application, the adapter is welded to the electrode terminal to form a first solder mark, which is exposed in the recess.

[0027] In the above scheme, the first solder mark is exposed in the recessed part, which allows the adapter and the electrode terminal to be welded on the side of the adapter where the recessed part is provided, which is convenient for operation and improves the connection reliability between the adapter and the electrode terminal.

[0028] According to some embodiments of this application, the electrode terminal has a first end face facing the adapter, the first end face being connected to a protrusion; the protrusion covers the first end face along the thickness direction of the first wall.

[0029] In the above scheme, by making the protrusion cover the first end face along the thickness direction of the first wall, the protrusion and the first end face have a large connection area, which is conducive to welding the protrusion and the first end face, and enables the adapter and the electrode terminal to have a high current carrying capacity.

[0030] According to some embodiments of this application, the electrode assembly includes a positive electrode and a negative electrode, the electrode assembly has a flat region, and the portions of the positive electrode and the negative electrode located in the flat region are stacked along a first direction.

[0031] In the above scheme, the portion of the positive electrode plate located in the flat region and the portion of the negative electrode plate located in the flat region are stacked along a first direction. The first direction can be the thickness direction of the electrode assembly. The first connection portion and the electrode terminal overlap at least partially along the thickness direction of the electrode assembly, so that the flow path of the current between the first connection portion and the electrode terminal can be designed to be shorter, which is beneficial to the circulation of the current.

[0032] Secondly, embodiments of this application also provide a battery device, which includes a battery cell provided according to any of the above embodiments.

[0033] The battery device according to the embodiments of this application uses a battery cell with high energy density provided in the above embodiments, so that the battery device can have high energy density.

[0034] According to some embodiments of this application, the number of battery cells is multiple, and the battery device also includes a busbar component that connects the electrode terminals of two battery cells.

[0035] In the above scheme, the electrode terminals of two battery cells are connected through a busbar to facilitate electrical connection between multiple battery cells and to facilitate the collection of electrical energy.

[0036] According to some embodiments of this application, the busbar component is welded to the electrode terminal to form a second weld mark. Along the thickness direction of the first wall, the penetration depth of the portion of the second weld mark located at the electrode terminal is N, which satisfies 0.1mm≤N≤3.5mm.

[0037] In the above scheme, the busbar component is welded to the electrode terminal, so that the connection between the busbar component and the electrode terminal is firm; the penetration depth N of the second solder mark located on the electrode terminal along the thickness direction of the first wall satisfies the above relationship (0.1mm≤N≤3.5mm). Under the condition of meeting the reliability requirements of the connection between the busbar component and the electrode terminal, the energy consumption during the welding of the busbar component and the electrode terminal is low.

[0038] According to some embodiments of this application, 0.5mm ≤ N ≤ 2mm.

[0039] In the above scheme, when N≥0.5mm, the connection reliability between the busbar and the electrode terminal is further improved; when N≤2mm, the energy efficiency during welding of the busbar and the electrode terminal is further reduced.

[0040] Thirdly, embodiments of this application also provide an electrical device, which includes a battery cell or a battery device provided according to any of the above embodiments, wherein the battery cell or battery device is used to provide electrical energy to the electrical device.

[0041] 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

[0042] 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.

[0043] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0044] Figure 2 This is an exploded view of the structure of a battery device provided in some embodiments of this application;

[0045] Figure 3 This is an exploded view of the structure of a battery cell provided in some embodiments of this application;

[0046] Figure 4 Front view of a battery cell provided for some embodiments of this application;

[0047] Figure 5 for Figure 4 A cross-sectional view along the AA direction;

[0048] Figure 6 for Figure 5 A magnified view of section B;

[0049] Figure 7 for Figure 6 Enlarged view of the layout at point C;

[0050] Figure 8 This is a cross-sectional view of a portion of the structure of a battery device provided in some embodiments of this application.

[0051] Icons: 100 - Battery assembly; 10 - Housing; 11 - First sub-housing; 12 - Second sub-housing; 20 - Battery cell; 21 - Housing; 21a - First wall; 21b - Electrode lead-out hole; 21c - Wall portion; 21d - Third connection portion; 21e - Third solder mark; 211 - Housing; 212 - End cap; 22 - Electrode terminal; 22a - Positive terminal; 22b - Negative terminal; 221 - First end face; 222 - Second end face; 23 - Electrode assembly; 23a - Flat area; 231 - Tab; 231a - Positive tab; 231b - Negative tab; 2311 - First connection portion; 2312 - Second connection portion; 2 32-Main body; 24-Adapter; 24a-Positive adapter; 24b-Negative adapter; 241-Adapter body; 241a-Second surface; 241b-Third surface; 242-Protrusion; 243-Recess; 25-First insulator; 251-First surface; 252-Insulator body; 253-Extension; 26-Sealing element; 27-Second insulator; 31-First solder mark; 32-Second solder mark; 40-Busseter; 200-Controller; 300-Motor; 1000-Vehicle; J-Radial direction of electrode terminal; X-First direction; Y-Length direction of battery cell; Z-Thickness direction of first wall. Detailed Implementation

[0052] 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 and completely 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.

[0053] 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.

[0054] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0055] 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.

[0056] 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.

[0057] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two), and "multiple pieces" refers to two or more (including two).

[0058] The battery device mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0059] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells into a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0060] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing.

[0061] 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.

[0062] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0063] As an example, the enclosure may include a first sub-enclosure and a second sub-enclosure. The first and second sub-enclosures are interlocked 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 sub-enclosure may be a top cover or a bottom plate.

[0064] 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.

[0065] 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.

[0066] In some embodiments, the battery device refers to an energy storage device, which includes a housing with a door on at least one side. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0067] 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.

[0068] The battery cell may be, but is not limited to, 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.

[0069] 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, prevents short circuits while allowing active ions to pass through.

[0070] 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.

[0071] 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.

[0072] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be made of stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium with a silver-plated surface. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0073] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for batteries may also be used.

[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 or a composite current collector. For example, as a metal foil, it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, or made of carbon, nickel, or titanium, etc.

[0076] In some embodiments, 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.

[0077] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in batteries. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0078] In some embodiments, the separator is a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0079] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a separate component located between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes.

[0080] 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.

[0081] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0082] In some implementations, the electrode assembly is a stacked structure.

[0083] 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), or a composite metal (such as a copper-aluminum composite housing).

[0084] In some embodiments, the housing includes an end cap and a casing, the casing having an opening, and the end cap closing the opening to form a sealed space for accommodating substances such as electrode assemblies and electrolytes. The casing may have one or more openings. The end cap may also be provided one or more times.

[0085] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab of the electrode assembly. The electrode terminal can be indirectly connected to the tab via an adapter. The electrode terminal can be located on an end cap or on the housing.

[0086] In some embodiments, a pressure relief mechanism is provided on the casing. The pressure relief mechanism is used to release the internal pressure of the battery cells.

[0087] In some embodiments, the housing can be a sealed structure or a non-sealed structure. As an example, when the housing is a sealed structure, it protects the electrode assembly and prevents leaks such as electrolyte leakage. When the housing is a non-sealed structure, it protects the electrode assembly, and a sealing bag may be included between the housing and the electrode assembly to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag can be a bag-shaped insulating material or an aluminum-plastic film.

[0088] As an example, a battery cell can be a prismatic battery cell or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries.

[0089] The development of battery device technology must take into account multiple design factors, such as reliability, discharge capacity, charge / discharge rate and other performance parameters. In addition, the energy density of the battery device also needs to be considered.

[0090] In some embodiments, the battery cell includes a housing, electrode terminals, an electrode assembly, and an adapter. The electrode terminals are disposed on an end cap of the housing, and the electrode assembly is disposed within the housing. The electrode assembly has tabs with a first connecting portion, and the electrode terminals are connected to the first connecting portion via the adapter. The end cap has electrode lead-out holes, through which the electrode terminals are connected to the adapter. Because the tabs need to connect to the adapter, the tabs are relatively long. After being bent, the tabs are housed within the housing, resulting in the bent portion of the tabs occupying a large space in the thickness direction of the end cap. To achieve the connection between the electrode terminals and the busbar, a portion of the electrode terminals protrudes from the outer surface of the end cap. Typically, the electrode terminals protrude significantly from the end cap, are positioned closer to the outer side of the end cap, and do not extend into the electrode lead-out hole. Alternatively, the end of the electrode terminal facing the inside of the battery cell is located within the electrode lead-out hole, and the adapter extends into the electrode lead-out hole to connect with the electrode terminal. Furthermore, the first connecting portion is located on the side of the adapter away from the end cap. In a direction perpendicular to the thickness direction of the end cap, the tabs and electrode terminals do not overlap, resulting in low space utilization within the battery cell in the thickness direction of the end cap and thus low energy density of the battery cell.

[0091] In view of this, in order to solve the problem of low energy density caused by low internal space utilization of battery cells, this application provides a battery cell including a shell, electrode terminals, electrode assemblies, and an adapter. The shell includes a first wall with an electrode lead-out hole extending through the first wall along its thickness direction. The electrode terminals are disposed on the first wall, with a portion of the electrode terminals disposed within the electrode lead-out hole. The electrode assembly is disposed within the shell and has tabs. The adapter connects the electrode terminals and the tabs, with the tabs having a first connecting portion that connects to the adapter. The electrode terminals protrude from the inner surface of the first wall. Along a first direction, the first connecting portion is located to the side of the electrode terminals. On the same projection plane perpendicular to the first direction, the orthographic projection of the first connecting portion at least partially overlaps with the orthographic projection of the electrode terminals. The first direction is perpendicular to the thickness direction of the first wall. This battery cell has high internal space utilization and high energy density.

[0092] In such a battery cell, a portion of the electrode terminal is disposed within the electrode lead-out hole, and the electrode terminal protrudes from the inner surface of the first wall, so that the electrode terminal is disposed closer to the interior of the battery cell. The size of the electrode terminal protruding from the outer surface of the first wall can be small, which can reduce the overall height of the battery cell. At the same time, on the same projection plane perpendicular to the first direction, the orthographic projection of the first connection portion and the orthographic projection of the electrode terminal at least partially overlap. The first connection portion can utilize the lateral space of the electrode terminal in the first direction, which can improve the space utilization rate of the battery cell in the thickness direction of the first wall, so that the battery cell has a higher energy density.

[0093] The battery device disclosed in this application can be used, but is not limited to, in electrical equipment such as vehicles, ships, or aircraft. A power system for such electrical equipment can be constructed using the battery device disclosed in this application.

[0094] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery cells and battery devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft.

[0095] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device according to an embodiment of this application.

[0096] Please refer to Figure 1 , Figure 1This is a schematic diagram of the structure of a vehicle provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is installed inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000's electrical system, such as meeting the power requirements for starting, navigation, and operation of the vehicle 1000.

[0097] The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, for the power needs of the vehicle 1000 during startup, navigation and driving.

[0098] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0099] Please refer to Figure 2 , Figure 2 This is an exploded view of the structure of a battery device provided in some embodiments of this application. The battery device 100 includes a housing 10 and battery cells 20, with the battery cells 20 housed within the housing 10. The housing 10 provides space for housing the battery cells 20, and the housing 10 can adopt various structures.

[0100] In some embodiments, the housing 10 may include a first sub-housing 11 and a second sub-housing 12, which overlap each other and together define a space for accommodating the battery cell 20. The second sub-housing 12 may be a hollow structure with one end open, and the first sub-housing 11 may be a plate-like structure, with the first sub-housing 11 covering the open side of the second sub-housing 12 so that the first sub-housing 11 and the second sub-housing 12 together define a space for accommodating the battery cell 20; the first sub-housing 11 and the second sub-housing 12 may also be hollow structures with one side open, with the open side of the first sub-housing 11 covering the open side of the second sub-housing 12.

[0101] In the battery device 100, there can be multiple battery cells 20. These multiple battery cells 20 can be connected in series, in parallel, or in a mixed manner. A mixed connection means that multiple battery cells 20 are connected in both series and parallel. Multiple battery cells 20 can be directly connected in series, in parallel, or in a mixed manner, and then the whole assembly of multiple battery cells 20 is housed in the housing 10. Alternatively, the battery device 100 can also be composed of multiple battery cells 20 first connected in series, in parallel, or in a mixed manner to form a battery cell 20 assembly, and then the multiple battery cell 20 assemblies are connected in series, in parallel, or in a mixed manner to form a whole, which is then housed in the housing 10.

[0102] The battery device 100 may also include other structures, for example, the battery device 100 may also include a busbar for realizing electrical connection between multiple battery cells 20.

[0103] Please refer to Figures 3 to 6 , Figure 3 This is an exploded view of the structure of a battery cell provided in some embodiments of this application. Figure 4 This is a front view of a battery cell provided in some embodiments of this application. Figure 5 for Figure 4 A cross-sectional view along the AA direction. Figure 6 for Figure 5 A magnified view of section B. (See image below.) Figure 3 As shown, this application provides a battery cell 20, which includes a housing 21, electrode terminals 22, electrode assembly 23, and adapter 24. The outer casing 21 includes a first wall 21a, the first wall 21a having an electrode lead-out hole 21b that penetrates the first wall 21a along the thickness direction Z; an electrode terminal 22 is disposed on the first wall 21a, a portion of which is disposed within the electrode lead-out hole 21b; an electrode assembly 23 is disposed within the outer casing 21, the electrode assembly 23 having a tab 231; an adapter 24 connects the electrode terminal 22 and the tab 231, the tab 231 having a first connecting portion 2311 connected to the adapter 24; wherein, the electrode terminal 22 protrudes from the inner surface of the first wall 21a along the first direction X, the first connecting portion 2311 is located to the side of the electrode terminal 22, and on the same projection plane perpendicular to the first direction X, the orthographic projection of the first connecting portion 2311 at least partially overlaps with the orthographic projection of the electrode terminal 22, the first direction X being perpendicular to the thickness direction Z of the first wall.

[0104] The housing 21 may include a housing 211 and an end cap 212. The housing 211 has an opening, and the end cap 212 closes the opening to isolate the internal environment of the battery cell 20 from the external environment.

[0105] The housing 211 is a component used to cooperate with the end cap 212 to form the internal environment of the battery cell 20, wherein the formed internal environment can accommodate the electrode assembly 23, electrolyte, and other components. The housing 211 and the end cap 212 can be independent components. The housing 211 can have various shapes and sizes. Specifically, the shape of the housing 211 can be determined according to the specific shape and size of the electrode assembly 23. The housing 211 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, and plastic.

[0106] End cap 212 refers to a component that covers the opening of housing 211 to isolate the internal environment of battery cell 20 from the external environment. The shape of end cap 212 can be adapted to the shape of housing 211 to fit it. Optionally, end cap 212 can be made of a material with certain hardness and strength (such as aluminum alloy), so that end cap 212 is not easily deformed under pressure and impact, allowing battery cell 20 to have higher structural strength and improved reliability. Functional components such as electrode terminals 22 and pressure relief mechanisms can be provided on end cap 212. Electrode terminals 22 can be used for electrical connection with electrode assembly 23 to output or input electrical energy to battery cell 20. The material of end cap 212 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose special limitations on this. In some embodiments, an insulating structure may be provided on the inner side of the end cap 212. The insulating structure can be used to isolate the electrical connection components within the housing 211 from the end cap 212 to reduce the risk of short circuits. For example, the insulating structure may be made of plastic, rubber, etc.

[0107] Electrode assembly 23 is the component in the battery cell 20 where the electrochemical reaction occurs. The housing 211 may contain one or more electrode assemblies 23. The electrode assembly 23 is mainly formed by winding or stacking positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets to separate them and prevent internal short circuits. The portions of the positive and negative electrode sheets containing active material constitute the main body of the electrode assembly 23, while the portions of the positive and negative electrode sheets without active material each constitute tabs 231. Positive tabs 231a and negative tabs 231b may be located together at one end of the main body or separately at both ends of the main body.

[0108] Electrode terminal 22 is a component for outputting or inputting electrical energy of battery cell 20. Internally, electrode terminal 22 is used for electrical connection with electrode assembly 23. For example, electrode terminal 22 and electrode tab 231 of electrode assembly 23 are electrically connected through adapter 24. Externally, electrode terminal 22 is used for electrical connection with busbar component to connect two battery cells 20 through busbar component.

[0109] The first wall 21a can be an end cap 212, or it can be a wall portion of the housing 211.

[0110] In some embodiments, the first wall 21a is an end cap 212, which facilitates the assembly of the electrode terminal 22 with the end cap 212 and makes it easier to assemble the electrode terminal 22 with the adapter 24.

[0111] The inner surface of the first wall 21a refers to the surface of the first wall 21a facing the electrode assembly 23, and the outer surface of the first wall 21a refers to the surface of the first wall 21a away from the electrode assembly 23.

[0112] The electrode lead-out hole 21b is a through hole that penetrates the first wall 21a along the thickness direction Z of the first wall. The electrode lead-out hole 21b connects the inner and outer sides of the first wall 21a to facilitate the assembly of the electrode terminal 22 with the first wall 21a. In some embodiments, the electrode lead-out hole 21b can connect the inner and outer surfaces of the first wall 21a.

[0113] The electrode terminal 22 includes a first end face 221 and a second end face 222 disposed opposite to each other along the thickness direction Z of the first wall. The first end face 221 is closer to the interior of the battery cell 20 than the second end face 222. The first end face 221 is located inside the first wall 21a, and the second end face 222 is located outside the first wall 21a. The first end face 221 is used to connect with the adapter 24, and the second end face 222 is used to connect with the busbar component. The first end face 221 protrudes from the inner surface of the first wall 21a in a direction pointing inward from the outer side of the first wall 21a, so that the electrode terminal 22 is disposed closer to the interior of the battery cell 20, facilitating the connection between the electrode terminal 22 and the adapter 24.

[0114] The adapter 24 is a component that enables the electrical connection between the electrode terminal 22 and the tab 231. The adapter 24 is a conductive component, and the material of the adapter 24 can be copper, aluminum, etc.

[0115] The first connecting part 2311 is the part of the tab 231 used to connect with the adapter 24. The first connecting part 2311 and the adapter 24 can be welded together so that the first connecting part 2311 and the adapter 24 are firmly connected, which facilitates the flow of current between the first connecting part 2311 and the adapter 24.

[0116] The first connecting portion 2311 being located to the side of the electrode terminal 22 means that, along the first direction X, the first connecting portion 2311 and the electrode terminal 22 are spaced apart.

[0117] With the first direction X as the projection direction, the orthographic projection of the first connecting part 2311 and the orthographic projection of the electrode terminal 22 at least partially overlap. That is, in the thickness direction Z of the first wall, at least a portion of the first connecting part 2311 is located between the first end face 221 and the inner surface of the first wall 21a.

[0118] In some embodiments, the first direction X may be parallel to the thickness direction of the battery cell 20, or the first direction X may be parallel to the length direction of the battery cell 20.

[0119] In some embodiments, when polarity is not defined, electrode terminal 22, electrode tab 231, and adapter 24 are of the same polarity. Please refer to... Figure 3 The battery cell 20 may include two electrode terminals 22 and two adapters 24. The two electrode terminals 22 are a positive terminal 22a and a negative terminal 22b, respectively, and the two adapters 24 are a positive adapter 24a and a negative adapter 24b, respectively. The electrode assembly 23 may have a positive electrode tab 231a and a negative electrode tab 231b. The positive electrode tab 231a is connected to the positive terminal 22a through the positive adapter 24a, and the negative electrode tab 231b is connected to the negative terminal 22b through the negative adapter 24b.

[0120] According to the embodiment of this application, in the battery cell 20, the electrode terminal 22 protrudes from the inner surface of the first wall 21a, so that the electrode terminal 22 is disposed more towards the interior of the battery cell 20. Furthermore, on the same projection plane perpendicular to the first direction X, the orthographic projection of the first connection portion 2311 and the orthographic projection of the electrode terminal 22 at least partially overlap. The first connection portion 2311 can utilize the lateral space of the electrode terminal 22 in the first direction X, thereby improving the space utilization rate of the battery cell 20 in the thickness direction Z of the first wall, so that the battery cell 20 has a higher energy density.

[0121] Please refer to Figure 6 According to some embodiments of this application, along the thickness direction Z of the first wall, the first connecting portion 2311 is located between the adapter 24 and the first wall 21a.

[0122] Along the thickness direction Z of the first wall, the first connecting part 2311 can be located between the inner surface of the first wall 21a and the adapter 24, and the first connecting part 2311 can be located on the side of the adapter 24 facing the first wall 21a, so that the distance between the first connecting part 2311 and the first wall 21a is shorter.

[0123] In the above scheme, by placing the first connecting part 2311 between the adapter 24 and the first wall 21a along the thickness direction Z of the first wall, the first connecting part 2311 is closer to the first wall 21a. By utilizing the bending space of the tab 231 in the thickness direction Z of the first wall, the space utilization rate inside the battery cell 20 in the thickness direction Z of the first wall can be improved, which is beneficial to improving the energy density of the battery cell 20.

[0124] Please refer to Figure 6 According to some embodiments of this application, the battery cell 20 further includes a first insulating member 25, which is disposed on the inner side of the first wall 21a along the thickness direction Z of the first wall. At least a portion of the first insulating member 25 is disposed between the first wall 21a and the adapter 24, and the first connecting portion 2311 is located between the first insulating member 25 and the adapter 24.

[0125] The first insulating component 25 is an electrical insulating component, and the material of the first insulating component 25 can be plastic, rubber, etc. The first insulating component 25 can serve to separate the first wall 21a and the adapter 24.

[0126] In some embodiments, the first insulating member 25 is connected to the inner surface of the first wall 21a. For example, the first insulating member 25 may be bonded to the inner surface of the first wall 21a, or the first insulating member 25 may be snapped onto the first wall 21a.

[0127] Optionally, the first insulating member 25 is bonded to the inner surface of the first wall 21a to facilitate the assembly of the first insulating member 25 and the first wall 21a.

[0128] In the above scheme, the first insulating member 25 is disposed on the inner side of the first wall 21a, which can separate the adapter 24 and the first wall 21a and reduce the risk of short circuit between the adapter 24 and the first wall 21a; the first connecting part 2311 is located between the first insulating member 25 and the adapter 24, and the first connecting part 2311 is separated by the first insulating member 25, which can reduce the risk of short circuit between the first connecting part 2311 and the first wall 21a.

[0129] Please refer to Figure 6 and further refer to Figure 7 , Figure 7 for Figure 6 Enlarged view of the layout at point C. According to some embodiments of this application, the first insulating member 25 has a first surface 251 facing away from the first wall 21a, and the first connecting portion 2311 is located between the first surface 251 and the adapter 24; the electrode terminal 22 protrudes from the first surface 251 in a direction pointing from the outside to the inside of the first wall 21a.

[0130] The first surface 251 is the surface of the first insulating member 25 that is away from the first wall 21a, and the first surface 251 is disposed facing the electrode assembly 23.

[0131] Along the thickness direction Z of the first wall, the first connecting portion 2311 is located between the first surface 251 and the adapter 24, so that the first insulating member 25 can separate the first connecting portion 2311 and the first wall 21a, reducing the risk of short circuit between the first connecting portion 2311 and the first wall 21a.

[0132] The electrode terminal 22 protrudes from the first surface 251, which can reduce the risk of interference between the adapter 24 and the first insulating member 25 and facilitate the connection between the electrode terminal 22 and the adapter 24. At the same time, the electrode terminal 22 and the first connecting part 2311 can have a large overlap area in the thickness direction Z of the first wall. That is, when viewed along the first direction X, the electrode terminal 22 and the first connecting part 2311 can have a large overlap area.

[0133] In the above scheme, the end of the electrode terminal 22 that is closer to the inside of the battery cell 20 protrudes from the first surface 251, so that the electrode terminal 22 is disposed closer to the inside of the battery cell 20. The size of the electrode terminal 22 protruding from the outer surface of the first wall 21a can be designed to be smaller, which can reduce the overall height of the battery cell 20 and improve the energy density of the battery cell 20.

[0134] Please refer to Figure 6 and Figure 7 According to some embodiments of this application, the first insulating member 25 includes an insulating member body 252 and an extension 253. Along the thickness direction Z of the first wall, the insulating member body 252 is disposed between the first wall 21a and the adapter 24; the extension 253 is connected to the insulating member body 252, and in the radial direction J of the electrode terminal, at least a portion of the extension 253 is located between the hole wall of the electrode lead-out hole 21b and the electrode terminal 22.

[0135] The insulating body 252 and the extension 253 are connected to each other. The insulating body 252 and the extension 253 can be integrally formed so that the insulating body 252 and the extension 253 are firmly connected.

[0136] The insulating body 252 is the portion of the first insulating member 25 located between the first wall 21a and the adapter 24.

[0137] In some embodiments, the extension 253 may be annular and may surround the electrode terminal 22. A portion of the extension 253 extends into the electrode lead-out hole 21b, such that the extension 253 is located between the hole wall of the electrode lead-out hole 21b and the electrode terminal 22. The extension 253 can separate the electrode terminal 22 from the hole wall of the electrode lead-out hole 21b, reducing the risk of short circuit between the electrode terminal 22 and the hole wall of the electrode lead-out hole 21b.

[0138] The radial direction J of the electrode terminal is perpendicular to the thickness direction Z of the first wall. In some embodiments, the electrode terminal 22 may be cylindrical. In other embodiments, the electrode terminal 22 may be non-cylindrical, and the radial direction of the circumscribed circle of the electrode terminal 22 is the radial direction J of the electrode terminal.

[0139] In the above scheme, the insulating body 252 is disposed between the first wall 21a and the adapter 24, and at least a portion of the extension 253 is located between the hole wall of the electrode lead-out hole 21b and the electrode terminal 22, so as to reduce the risk of short circuit between the first wall 21a and the adapter 24 and the electrode terminal 22, and improve the reliability of the battery cell 20.

[0140] Please refer to Figure 6 and Figure 7 According to some embodiments of this application, in the radial direction J of the electrode terminal, there is a gap between the extension 253 and the electrode terminal 22.

[0141] The gap is designed so that the extension 253 does not contact the electrode terminal 22, and there is a certain distance between the extension 253 and the electrode terminal 22 in the radial direction J of the electrode terminal.

[0142] In the above scheme, there is a gap between the extension 253 and the electrode terminal 22, which facilitates the assembly of the electrode terminal 22 and the first wall 21a to accommodate processing errors; at the same time, it can reduce the impact of the high temperature during the welding of the electrode terminal 22 and the adapter 24 on the extension 253, and facilitate the improvement of the reliability of the battery cell 20.

[0143] Please refer to Figure 6 and Figure 7 According to some embodiments of this application, the adapter 24 is welded to the electrode terminal 22 to form a first solder mark 31; along the thickness direction Z of the first wall, the penetration depth of the portion of the first solder mark 31 located at the electrode terminal 22 is M, which satisfies 0.05mm≤M≤2mm.

[0144] The first weld mark 31 can be a weld mark formed after the adapter 24 is welded to the electrode terminal 22.

[0145] The penetration depth M of the portion of the first solder mark 31 located on the electrode terminal 22 along the thickness direction Z of the first wall refers to the maximum depth of the molten zone at the end where the electrode terminal 22 connects to the adapter 24 along the thickness direction Z of the first wall. The penetration depth M of the portion of the first solder mark 31 located on the electrode terminal 22 along the thickness direction Z of the first wall can be obtained by scanning the electrode terminal 22 with a CT scanning device. For example, the electrode terminal 22 can be scanned along the radial direction J of the electrode terminal, and the depth of the molten zone along the thickness direction Z of the first wall can be measured on the obtained scan image. The maximum depth of the molten zone is obtained by multiple measurements, and this maximum depth is M.

[0146] In some embodiments, M can be, but is not limited to, any one or a range between any two of 0.05mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, or 2mm.

[0147] In the above scheme, the adapter 24 is welded to the electrode terminal 22, so that the adapter 24 and the electrode terminal 22 are firmly connected; the penetration depth M of the first solder mark 31 located on the electrode terminal 22 along the thickness direction Z of the first wall satisfies the above relationship (0.05mm≤M≤2mm). Under the condition of meeting the reliability requirements of the connection between the adapter 24 and the electrode terminal 22, the energy consumption during the welding of the adapter 24 and the electrode terminal 22 is low.

[0148] According to some embodiments of this application, 0.2mm ≤ M ≤ 1mm.

[0149] In some embodiments, M can be, but is not limited to, any one or a range between any two of 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm, or 1mm.

[0150] In the above scheme, when M≥0.2mm, the connection reliability between the adapter 24 and the electrode terminal 22 is further improved; when M≤1mm, the energy consumption during welding of the adapter 24 and the electrode terminal 22 is further reduced.

[0151] Please refer to Figure 6 and Figure 7According to some embodiments of this application, the adapter 24 includes an adapter body 241 and a protrusion 242. The adapter body 241 includes a second surface 241a facing the first wall 21a. The protrusion 242 protrudes from the second surface 241a. A first connecting portion 2311 is connected to the second surface 241a, and an electrode terminal 22 is connected to the protrusion 242.

[0152] The adapter body 241 also includes a third surface 241b facing away from the first wall 21a. The third surface 241b and the second surface 241a are disposed opposite to each other along the thickness direction Z of the first wall of the adapter body 241. The thickness direction of the adapter body 241 may be parallel to the thickness direction Z of the first wall. The first connecting portion 2311 is located on the side of the adapter body 241 facing away from the third surface 241b.

[0153] In some embodiments, the protrusion 242 may be circular to facilitate manufacturing.

[0154] The protrusion 242 protrudes from the second surface 241a in the direction from the inside to the outside of the first wall 21a, so that the protrusion 242 is closer to the first wall 21a relative to the adapter body 241, so that the protrusion 242 can be connected to the electrode terminal 22.

[0155] In some embodiments, on the same projection plane perpendicular to the first direction X, the orthographic projection of the first connection portion 2311 overlaps with the orthographic projection of the electrode terminal 22, and the orthographic projection of the first connection portion 2311 overlaps with the orthographic projection of the protrusion 242.

[0156] The electrode terminal 22 and the protrusion 242 can be welded together, for example, by laser welding.

[0157] In some embodiments, along the thickness direction Z of the first wall, the adapter body 241 is located on the side of the first connection portion 2311 opposite to the first wall 21a.

[0158] In some embodiments, the electrode assembly 23 includes a main body 232 and a tab 231. The tab 231 extends from the end of the main body 232 and has a bent structure. The tab 231 also has a second connecting portion 2312 that connects to the main body 232. The first connecting portion 2311 is bent relative to the second connecting portion 2312 so that a receiving space is formed between the first connecting portion 2311 and the second connecting portion 2312. A portion of the adapter body 241 is located in the receiving space, thereby improving the space utilization rate inside the battery cell 20.

[0159] In the above scheme, the protrusion 242 protrudes from the second surface 241a to facilitate the connection between the adapter 24 and the electrode terminal 22. Meanwhile, the first connection 2311 is located on the side of the protrusion 242 along the first direction X, which can utilize the space inside the battery cell 20 in the thickness direction Z of the first wall, thereby improving the energy density of the battery cell 20.

[0160] Please refer to Figure 6 and Figure 7 According to some embodiments of this application, the adapter 24 has a recess 243 on the side opposite to the first wall 21a that corresponds to the position of the protrusion 242.

[0161] The recess 243 can be a groove formed on the side of the adapter 24 away from the first wall 21a.

[0162] In some embodiments, the adapter 24 can be a bent structure. For example, the adapter 24 can be formed from a substrate by a stamping process to form a recess 243 and a protrusion 242.

[0163] In the above scheme, the recessed portion 243 allows the adapter 24 to be formed by stamping, which is convenient for processing and manufacturing. The adapter 24 is also lighter, which helps to reduce the overall weight of the battery cell 20. When the adapter 24 forms the protrusion 242 and the recessed portion 243 by stamping, the adapter 24 can have high overall strength, which makes the connection between the adapter 24 and the electrode terminal 22 more reliable.

[0164] Please refer to Figure 6 and Figure 7 According to some embodiments of this application, the adapter 24 is welded to the electrode terminal 22 to form a first solder mark 31, and the first solder mark 31 is exposed in the recess 243.

[0165] In some embodiments, the recess 243 may be circular, and the inner surface of the protrusion 242 surrounds the recess 243, making the protrusion 242 a hollow structure. When the adapter 24 is welded to the electrode terminal 22, the welding of the protrusion 242 to the electrode terminal 22 can be performed within the recess 243, which can reduce the risk of slag spatter generated during the welding process.

[0166] The first solder mark 31 can extend from the surface of the recess 243 along the thickness direction Z of the first wall to the electrode terminal 22, so that the adapter 24 is connected to the electrode terminal 22.

[0167] In the above scheme, the first solder mark 31 is exposed in the recess 243, which allows the adapter 24 and the electrode terminal 22 to be soldered on the side of the adapter 24 where the recess 243 is provided, which facilitates operation and improves the connection reliability between the adapter 24 and the electrode terminal 22.

[0168] Please refer to Figure 6 and Figure 7 According to some embodiments of this application, the electrode terminal 22 has a first end face 221 facing the adapter 24, the first end face 221 being connected to the protrusion 242; the protrusion 242 covers the first end face 221 along the thickness direction Z of the first wall.

[0169] The first end face 221 and the protrusion 242 are connected by the first solder mark 31.

[0170] When viewed along the thickness direction Z of the first wall, the projection of the first end face 221 falls within the projection of the protrusion 242, so that the protrusion 242 covers the first end face 221. When the adapter 24 is welded to the electrode terminal 22, the solder mark can have a large area in the recess 243, so that the adapter 24 and the electrode terminal 22 have a large connection area, which can increase the flow area between the adapter 24 and the electrode terminal 22.

[0171] In the above scheme, by making the protrusion 242 cover the first end face 221 along the thickness direction Z of the first wall, the protrusion 242 and the first end face 221 have a large connection area, which is conducive to the welding of the protrusion 242 and the first end face 221, and enables the adapter 24 and the electrode terminal 22 to have a high current carrying capacity.

[0172] Please refer to Figure 3 According to some embodiments of this application, the electrode assembly 23 includes a positive electrode and a negative electrode. The electrode assembly 23 has a flat region 23a, and the portion of the positive electrode located in the flat region 23a and the portion of the negative electrode located in the flat region 23a are stacked along a first direction X.

[0173] The portion of the positive electrode plate located in the flat region 23a is flat. The portion of the negative electrode plate located in the flat region 23a is flat.

[0174] In an embodiment where the electrode assembly 23 has a stacked structure, both the positive and negative electrode sheets are flat and stacked along the first direction X.

[0175] In an embodiment where the electrode assembly 23 has a wound structure, the electrode assembly 23 includes a flat region 23a and two bending regions. The two bending regions are respectively connected to the two ends of the flat region 23a in the length direction of the battery cell 20. The positive electrode and the negative electrode are in a flat shape in the flat region 23a and in a bent shape in the bending regions.

[0176] Please refer to Figure 3 The first direction X is parallel to the thickness direction of the battery cell 20, and the first direction X is perpendicular to the length direction Y of the battery cell.

[0177] In the above scheme, the portion of the positive electrode plate located in the flat region 23a and the portion of the negative electrode plate located in the flat region 23a are stacked along the first direction X. The first direction X can be the thickness direction of the electrode assembly 23. The first connection portion 2311 and the electrode terminal 22 overlap at least partially along the thickness direction of the electrode assembly 23, so that the current flow path between the first connection portion 2311 and the electrode terminal 22 can be designed to be shorter, which is beneficial to the circulation of current.

[0178] According to some embodiments of this application, the outer casing 21 may be cuboid.

[0179] According to some embodiments of this application, the battery cell 20 can be a rigid-cased prismatic battery.

[0180] According to some embodiments of this application, the battery cell 20 further includes a seal 26, which is disposed around the electrode lead-out hole 21b and between the electrode terminal 22 and the first wall 21a, so that the electrode terminal 22 and the first wall 21a are sealed together to reduce the risk of electrolyte leakage from the electrode lead-out hole 21b.

[0181] In some embodiments, the seal 26 is made of an insulating material and is corrosion resistant.

[0182] According to some embodiments of this application, the battery cell 20 further includes a second insulating member 27, which is disposed between the first wall 21a and the electrode terminal 22 to separate the electrode terminal 22 from the first wall 21a.

[0183] Please refer to Figure 6 and Figure 7 The first wall 21a includes a wall portion 21c and a third connecting portion 21d. The third connecting portion 21d is connected to the wall portion 21c and is used to fix the electrode terminal 22 to the wall portion 21c. Along the thickness direction of the wall portion 21c, a portion of the electrode terminal 22 is located between the third connecting portion 21d and the wall portion 21c. A second insulating member 27 is disposed between the third connecting portion 21d and the electrode terminal 22 so that the third connecting portion 21d can cooperate with the wall portion 21c to clamp the electrode terminal 22.

[0184] In some embodiments, the third connecting portion 21d may be welded to the wall portion 21c to form a third weld mark 21e.

[0185] According to some embodiments of this application, this application also provides a battery device 100, which includes a battery cell 20 provided according to any of the above embodiments.

[0186] The battery device 100 according to the embodiments of this application uses the battery cell 20 with high energy density provided in the above embodiments, so that the battery device 100 can have a high energy density.

[0187] Please refer to Figure 8 , Figure 8 This is a cross-sectional view of a partial structure of a battery device provided in some embodiments of this application, for ease of description. Figure 8 The diagram shows only one assembly schematic of a battery cell 20 and a busbar 40. According to some embodiments of this application, there are multiple battery cells 20, and the battery device 100 also includes a busbar 40 that connects the electrode terminals 22 of two battery cells 20.

[0188] In some embodiments, the busbar 40 can connect two adjacent battery cells 20. The busbar 40 can connect the electrode terminals 22 of the same polarity of the two battery cells 20, or the busbar 40 can connect the electrode terminals 22 of different polarities of the two battery cells 20.

[0189] The busbar component 40 is a conductive component, and the material of the busbar component 40 can be metal, such as nickel, copper or aluminum.

[0190] In the above scheme, the electrode terminals 22 of two battery cells 20 are connected through a busbar 40 to facilitate electrical connection between multiple battery cells 20 and to facilitate the flow of electrical energy.

[0191] According to some embodiments of this application, the busbar component 40 is welded to the electrode terminal 22 to form a second weld mark 32. Along the thickness direction Z of the first wall, the penetration depth of the portion of the second weld mark 32 located at the electrode terminal 22 is N, which satisfies 0.1mm≤N≤3.5mm.

[0192] The second solder mark 32 can be a solder mark formed after the bus component 40 is soldered to the electrode terminal 22. The second solder mark 32 can be exposed on the side of the bus component 40 away from the electrode terminal 22, for example, the bus component 40 and the electrode terminal 22 are soldered on the side of the bus component 40 away from the electrode terminal 22.

[0193] During the welding process between the busbar component 40 and the electrode terminal 22, the busbar component 40 can be first brought into contact with the second end face 222 of the electrode terminal 22, and then the busbar component 40 and the electrode terminal 22 can be welded on the side of the busbar component 40 away from the electrode terminal 22. The second solder mark 32 extends from the busbar component 40 to the electrode terminal 22 along the thickness direction Z of the first wall, so that the busbar component 40 and the electrode terminal 22 are connected.

[0194] The penetration depth N of the portion of the second solder mark 32 located at the electrode terminal 22 along the thickness direction Z of the first wall refers to the maximum depth of the molten zone at the end where the electrode terminal 22 connects to the busbar 40 along the thickness direction of the bottom wall. The method for measuring the penetration depth N of the portion of the second solder mark 32 located at the electrode terminal 22 along the thickness direction Z of the first wall can refer to the measurement method of M.

[0195] In some embodiments, N can be, but is not limited to, any one or any two of 0.1mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm or 3.5mm.

[0196] In the above scheme, the busbar component 40 is welded to the electrode terminal 22, so that the busbar component 40 and the electrode terminal 22 are firmly connected; the penetration depth N of the second solder mark 32 located on the electrode terminal 22 along the thickness direction Z of the first wall satisfies the above relationship (0.1mm≤N≤3.5mm). Under the condition of meeting the reliability requirements of the connection between the busbar component 40 and the electrode terminal 22, the energy consumption during the welding of the busbar component 40 and the electrode terminal 22 is low.

[0197] According to some embodiments of this application, 0.5mm ≤ N ≤ 2mm.

[0198] In some embodiments, N can be, but is not limited to, any one or any two of 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, or 2mm.

[0199] In the above scheme, when N≥0.5mm, the connection reliability between the busbar component 40 and the electrode terminal 22 is further improved; when N≤2mm, the energy efficiency during welding of the busbar component 40 and the electrode terminal 22 is further reduced.

[0200] This application also provides an electrical device, which includes a battery cell 20 or a battery device 100 provided according to any of the above embodiments, wherein the battery cell 20 or the battery device 100 is used to provide electrical energy to the electrical device.

[0201] The electrical device can be any of the above-mentioned devices or systems that use battery cell 20 or battery device 100 as power source.

[0202] Please refer to Figures 3 to 7 This application provides a battery cell 20, which includes a housing 21, electrode terminals 22, electrode assembly 23, adapter 24, and a first insulating member 25.

[0203] The outer casing 21 includes a housing 211 and an end cap 212. The housing 211 has an opening, and the end cap 212 closes the opening. The outer casing 21 also includes a first wall 21a, which is the end cap 212. The first wall 21a is provided with an electrode lead-out hole 21b, which penetrates the first wall 21a along the thickness direction Z.

[0204] Electrode terminals 22 are disposed on the first wall 21a, a portion of which is disposed within the electrode lead-out hole 21b, and the electrode terminals 22 protrude from the inner surface of the first wall 21a, so that the electrode terminals 22 are disposed more towards the inside of the battery cell 20, thereby reducing the overall size of the battery cell 20 in the thickness direction Z of the first wall.

[0205] Electrode assembly 23 is disposed within housing 21. Electrode assembly 23 has tabs 231, and tabs 231 have a first connecting portion 2311 for connection with adapter 24. Electrode assembly 23 includes a positive electrode and a negative electrode. Electrode assembly 23 has a flat region 23a. The portions of the positive electrode and the negative electrode located in the flat region 23a are stacked along a first direction X, which is parallel to the thickness direction of electrode assembly 23.

[0206] The adapter 24 connects the electrode terminal 22 and the tab 231. The adapter 24 includes an adapter body 241 and a protrusion 242. The adapter body 241 includes a second surface 241a facing the first wall 21a. The protrusion 242 protrudes from the second surface 241a, a first connecting portion 2311 is connected to the second surface 241a, and the electrode terminal 22 is connected to the protrusion 242. The adapter 24 has a recess 243 on the side facing away from the first wall 21a, corresponding to the position of the protrusion 242. The adapter 24 can be formed by stamping, facilitating manufacturing. Along the first direction X, the first connection portion 2311 is located on the side of the electrode terminal 22. On the same projection plane perpendicular to the first direction X, the orthographic projection of the first connection portion 2311 and the orthographic projection of the electrode terminal 22 at least partially overlap. The first connection portion 2311 can utilize the space on the side of the electrode terminal 22 in the first direction X, which can improve the space utilization rate of the battery cell 20 in the thickness direction Z of the first wall, so that the battery cell 20 has a higher energy density.

[0207] The first insulating member 25 is disposed on the inner side of the first wall 21a along the thickness direction Z of the first wall. At least a portion of the first insulating member 25 is disposed between the first wall 21a and the adapter 24. The first insulating member 25 has a first surface 251 facing away from the first wall 21a, and a first connecting portion 2311 is located between the first surface 251 and the adapter 24. The electrode terminal 22 protrudes from the first surface 251 in a direction pointing from the outer side to the inner side of the first wall 21a. The first insulating member 25 includes an insulating member body 252 and an extension portion 253. Along the thickness direction Z of the first wall, the insulating member body 252 is disposed between the first wall 21a and the adapter 24. The extension portion 253 is connected to the insulating member body 252. In the radial direction J of the electrode terminal, at least a portion of the extension portion 253 is located between the hole wall of the electrode lead-out hole 21b and the electrode terminal 22, so as to reduce the risk of short circuit between the first wall 21a and the adapter 24 and the electrode terminal 22, and improve the reliability of the battery cell 20. In the radial direction J of the electrode terminal, there is a gap between the extension 253 and the electrode terminal 22, which facilitates the assembly of the electrode terminal 22 with the first wall 21a. At the same time, it can reduce the impact of the high temperature during the welding of the electrode terminal 22 and the adapter 24 on the extension 253, thereby improving the reliability of the battery cell 20.

[0208] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, include: The outer casing includes a first wall, the first wall being provided with an electrode lead-out hole, the electrode lead-out hole penetrating the first wall along the thickness direction; An electrode terminal is disposed on the first wall, and a portion of the electrode terminal is disposed within the electrode lead-out hole; An electrode assembly is disposed within the housing, and the electrode assembly has tabs; An adapter connects the electrode terminal and the electrode tab, wherein the electrode tab has a first connecting portion that connects to the adapter; Wherein, the electrode terminal protrudes from the inner surface of the first wall, and along the first direction, the first connecting portion is located to the side of the electrode terminal. On the same projection plane perpendicular to the first direction, the orthographic projection of the first connecting portion at least partially overlaps with the orthographic projection of the electrode terminal. The first direction is perpendicular to the thickness direction of the first wall.

2. The battery cell according to claim 1, characterized in that, Along the thickness direction of the first wall, the first connecting portion is located between the adapter and the first wall.

3. The battery cell according to claim 2, characterized in that, The battery cell further includes a first insulating member, which is disposed on the inner side of the first wall along the thickness direction of the first wall. At least a portion of the first insulating member is disposed between the first wall and the adapter, and the first connecting portion is located between the first insulating member and the adapter.

4. The battery cell according to claim 3, characterized in that, The first insulating member has a first surface facing away from the first wall, and the first connecting portion is located between the first surface and the adapter; The electrode terminals protrude from the first surface in a direction pointing inward from the outer side of the first wall.

5. The battery cell according to claim 3, characterized in that, The first insulating element includes: An insulating body is disposed between the first wall and the adapter along the thickness direction of the first wall. An extension is connected to the insulating body, and at least a portion of the extension is located between the wall of the electrode lead-out hole and the electrode terminal in the radial direction of the electrode terminal.

6. The battery cell according to claim 5, characterized in that, In the radial direction of the electrode terminal, there is a gap between the extension and the electrode terminal.

7. The battery cell according to claim 1, characterized in that, The adapter is welded to the electrode terminal to form a first weld mark; along the thickness direction of the first wall, the penetration depth of the portion of the first weld mark located at the electrode terminal is M, satisfying 0.05mm≤M≤2mm.

8. The battery cell according to claim 7, characterized in that, 0.2mm≤M≤1mm.

9. The battery cell according to claim 1, characterized in that, The adapter includes an adapter body and a protrusion. The adapter body includes a second surface facing the first wall. The protrusion protrudes from the second surface. The first connecting portion is connected to the second surface. The electrode terminal is connected to the protrusion.

10. The battery cell according to claim 9, characterized in that, The adapter has a recess on the side opposite to the first wall that corresponds to the position of the protrusion.

11. The battery cell according to claim 10, characterized in that, The adapter is welded to the electrode terminal to form a first solder mark, which is exposed in the recess.

12. The battery cell according to claim 10, characterized in that, The electrode terminal has a first end face facing the adapter, and the first end face is connected to the protrusion. Along the thickness direction of the first wall, the protrusion covers the first end face.

13. The battery cell according to claim 1, characterized in that, The electrode assembly includes a positive electrode and a negative electrode, and the electrode assembly has a flat region. The portion of the positive electrode located in the flat region and the portion of the negative electrode located in the flat region are stacked along the first direction.

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

15. The battery device according to claim 14, characterized in that, The battery cell is multiple, and the battery device also includes a busbar component that connects the electrode terminals of two of the battery cells.

16. The battery device according to claim 15, characterized in that, The busbar component is welded to the electrode terminal to form a second weld mark. Along the thickness direction of the first wall, the penetration depth of the portion of the second weld mark located at the electrode terminal is N, which satisfies 0.1mm≤N≤3.5mm.

17. The battery device according to claim 16, characterized in that, 0.5mm≤N≤2mm.

18. An electrical appliance, characterized in that, Includes a battery cell as described in any one of claims 1-13 or a battery device as described in any one of claims 14-17, wherein the battery cell or the battery device is used to provide electrical energy to the electrical device.

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