Battery cell, battery and electric device

Abstract

A battery cell (100), a battery (1100) and an electric device. The battery cell (100) comprises a casing (10), electrode assemblies (20) and adapters (30), wherein the casing (10) is provided with electrode terminals (40) for outputting or inputting electric energy; the electrode assemblies (20) are located in the casing (10), and each comprise a main body portion (21) and tabs (22) connected to an end portion of the main body portion (21); the adapters (30) are located in the casing (10), are provided with tab welding areas (31) configured to be welded to the tabs (22), and are further provided with terminal welding areas (32) configured to be welded to the electrode terminals (40); the tab welding areas (31) each comprise at least two tab welding sub-areas (311); and each terminal welding area (32) is located between two tab welding sub-areas (311).

Description

Battery cells, batteries and electrical devices

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on February 1, 2024, with application number 202410146547.6 and invention name “Battery Cell, Battery and Electrical Device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application belongs to the field of battery welding technology, and in particular relates to a battery cell, a battery, and an electrical device. Background Art

[0003] A battery is a device that can store and release electrical energy, providing the power required by electronic devices. A battery typically consists of one or more cells to meet varying power requirements. A cell is the smallest unit of a battery. A cell includes a housing, an adapter, and an electrode assembly housed within the housing. The housing is equipped with electrode terminals for inputting or outputting electrical energy. The tabs of the electrode assembly are welded to the adapter, and the electrode terminals are welded to the adapter to enable input and output of electrical energy.

[0004] However, the welding positions between the electrode tabs of the electrode assembly and the adapter and the welding positions between the electrode terminals and the adapter are far apart, resulting in large ohmic impedance of the battery cell, poor overcurrent, and increased heat generation, which seriously affects the performance of the battery cell.

[0005] The above statements are only used to provide background information related to the present application and do not necessarily constitute prior art.

[0006] Application Contents

[0007] The purpose of the embodiments of the present application is to provide a battery cell, a battery and an electrical device, including but not limited to solving the problem in the related art that the welding position of the electrode tab of the electrode assembly and the adapter and the welding position of the electrode terminal and the adapter are far apart, resulting in large ohmic impedance, poor overcurrent and increased heat in the battery cell.

[0008] The technical solution adopted in the embodiment of this application is:

[0009] In a first aspect, a battery cell is provided, which includes a shell, an electrode assembly and an adapter, the shell is provided with an electrode terminal for outputting or inputting electrical energy; the electrode assembly is located in the shell, the electrode assembly includes a main body and a tab connected to the end of the main body; the adapter is located in the shell, the adapter is provided with a tab welding area for welding to the tab, and the adapter is also provided with a terminal welding area for welding to the electrode terminal; the tab welding area includes at least two tab welding sub-areas, and the terminal welding area is located between the two tab welding sub-areas.

[0010] In the battery cell of the embodiment of the present application, the tabs of the electrode assembly are welded to the tab welding area of ​​the adapter, and the electrode pins of the shell are welded to the terminal welding area of ​​the adapter, which can realize electrical connection between the tabs and the electrode terminals, thereby realizing the input or output of electric energy of the battery cell; and the tab welding area includes at least two tab welding sub-areas, and the terminal welding area is located between the two tab welding sub-areas, which can make the welding position of the tab and the adapter and the welding position of the adapter and the electrode terminal closer, thereby reducing the ohmic impedance, reducing the overcurrent distance, reducing the heat generation, and improving the performance of the battery cell.

[0011] In some embodiments, the terminal welding region is spaced apart from the adjacent tab welding sub-region.

[0012] By adopting the technical solution of this embodiment, the gap between the terminal welding area and the tab welding sub-area can reduce the impact of the welding between the electrode terminal and the adapter on the tab and the tab welding sub-area, which is beneficial to improving the welding quality, improving the connection reliability of the adapter, the tab and the electrode terminal, and improving the performance and reliability of the battery cell.

[0013] In some embodiments, a distance between a terminal welding region and an adjacent tab welding sub-region is H, where 0 mm ≤ H ≤ 10 mm.

[0014] By adopting the technical solution of this embodiment, the design of 0mm≤H≤10mm makes the spacing between the terminal welding area and the adjacent tab welding sub-area appropriate, which is beneficial to reducing ohmic impedance, reducing overcurrent distance, reducing heat generation, and improving the performance of the battery cell.

[0015] In some embodiments, 5 mm ≤ H ≤ 8 mm.

[0016] By adopting the technical solution of this embodiment, the design of 5mm≤H≤8mm makes the spacing between the terminal welding area and the adjacent tab welding sub-area more reasonable, which is beneficial to reducing the impact of the welding between the electrode terminal and the adapter on the tab and the tab welding sub-area, improving the welding quality, and improving the connection reliability of the adapter, tab and electrode terminal. It is also beneficial to reduce ohmic impedance, reduce overcurrent distance, reduce heat generation, and improve the performance of the battery cell.

[0017] In some embodiments, the plurality of tab welding sub-regions are arranged at intervals along the first direction.

[0018] By adopting the technical solution of this embodiment, multiple tab welding sub-areas are arranged at intervals, so that a gap exists between two adjacent tab welding sub-areas. The setting of the gap can provide accommodating space for the terminal welding area, and can also reduce the risk of overlapping between the tab welding sub-area and the terminal welding area, reduce the impact of the welding between the electrode terminal and the adapter on the tab and the tab welding sub-area, improve the welding quality, and improve the connection reliability of the adapter, the tab and the electrode terminal; in addition, the tab welding sub-area is simply arranged, which is conducive to improving welding efficiency.

[0019] In some embodiments, the plurality of tab welding sub-regions are arranged in a ring shape along the circumference of the terminal welding region.

[0020] By adopting the technical solution of this embodiment, multiple tab welding sub-areas are arranged in a ring shape along the circumference of the terminal welding area, so that the terminal welding area is located inside the tab welding area. The distance between the terminal welding area and the tab welding sub-area is close, the overcurrent distance is short, the ohmic impedance is small, and the heat generation is small, which is more conducive to improving the performance of the battery cell; in addition, the welding area between the tab and the adapter is large, and the welding reliability between the tab and the adapter is good, which is conducive to improving the reliability and performance of the battery cell.

[0021] In some embodiments, two adjacent tab welding sub-regions are spaced apart from each other; or, two adjacent tab welding sub-regions are connected.

[0022] By adopting the technical solution of this embodiment, multiple tab welding sub-areas can be flexibly arranged to meet the performance requirements of different battery cells.

[0023] In some embodiments, the adapter is welded with multiple tabs of the same polarity, and the multiple tabs of the same polarity are used to be welded one-to-one with multiple tab welding sub-areas; or, the adapter is welded with multiple tabs of the same polarity, and the number of tab welding areas is multiple, and the multiple tabs of the same polarity are used to be welded one-to-one with multiple tab welding areas.

[0024] By adopting the technical solution of this embodiment, the connection method between the adapter, the tab and the electrode terminal can be flexibly set to meet the needs of different battery cells.

[0025] In some embodiments, when multiple tabs with the same polarity are welded to multiple tab welding sub-areas in a one-to-one correspondence, at least one tab covers at least a portion of the corresponding tab welding sub-area; when multiple tabs with the same polarity are welded to multiple tab welding areas in a one-to-one correspondence, at least one tab covers at least a portion of the corresponding tab welding area.

[0026] By adopting the technical solution of this embodiment, the welding area between the tab and the adapter can be flexibly set to meet the usage requirements of different battery cells.

[0027] In some embodiments, the adapter is welded with multiple tabs with the same polarity, the multiple tabs with the same polarity are arranged at intervals, and an avoidance gap is formed between two adjacent tabs, and the avoidance gap is arranged opposite to the terminal welding area.

[0028] By adopting the technical solution of this embodiment, the avoidance gap is arranged relative to the terminal welding area, so that the terminal welding area and the tab are staggered, thereby reducing the damage to the tab caused by the welding between the electrode terminal and the adapter, which is beneficial to improving the welding quality and improving the connection reliability of the adapter, the tab and the electrode terminal.

[0029] In some embodiments, the adapter is welded with a plurality of tabs with the same polarity, and the plurality of tabs with the same polarity are overlapped to form an overlap portion, which is used to be welded to the tab welding area.

[0030] By adopting the technical solution of this embodiment, the overlapping portion is formed by overlapping a plurality of tabs, and the overlapping portion has a large thickness, which is beneficial to improving the welding quality and connection reliability between the tab and the adapter.

[0031] In some embodiments, the edge of the tab away from the main body is used for welding to the tab welding sub-region.

[0032] By adopting the technical solution of this embodiment, the edge of the tab away from the main body is welded to the tab welding sub-area, so that the edge of the tab away from the main body is fixed, reducing the risk of the edge of the tab being warped and damaged, and also helping to improve the reliability of the welding connection.

[0033] In some embodiments, a position corresponding to the terminal welding area of ​​the tab is provided with an avoidance through hole for avoiding the terminal welding area.

[0034] By adopting the technical solution of this embodiment and setting the avoidance through-hole, the tab can be kept away from the terminal welding area, thereby reducing the damage to the tab caused by welding the electrode terminal and the adapter, which is beneficial to improving the welding quality and improving the connection reliability of the adapter, the tab and the electrode terminal.

[0035] In some embodiments, the area of ​​the tab is S1, and the cross-sectional area of ​​the avoidance through hole is S2, wherein 0.05≤S2 / S1≤0.25.

[0036] By adopting the technical solution of this embodiment, the design of 0.05≤S2 / S1≤0.25 can take into account the welding reliability of the tab and the adapter, and reduce the damage to the tab during the welding process of the electrode terminal and the adapter, so that the tab, the adapter and the electrode terminal can be stably connected together.

[0037] In some embodiments, 0.1≤S2 / S1≤0.2.

[0038] By adopting the technical solution of this embodiment, the design of 0.05S1≤S2≤0.2S1 can better take into account the welding reliability of the tab and the adapter, and reduce the damage to the tab during the welding process of the electrode terminal and the adapter, so that the tab, the adapter and the electrode terminal can be connected together more stably.

[0039] In some embodiments, the cross-sectional area of ​​the avoidance through hole is S2, where 25 mm2≤S2≤125 mm2.

[0040] By adopting the technical solution of this embodiment, the design of 25mm2≤S2≤125mm2 can take into account the welding reliability of the tab and the adapter, and reduce the damage to the tab during the welding process of the electrode terminal and the adapter, so that the tab, the adapter and the electrode terminal can be stably connected together.

[0041] In some embodiments, 35mm2≤S2≤65mm2.

[0042] By adopting the technical solution of this embodiment, the design of 35mm2≤S2≤65mm2 can better take into account the welding reliability of the tab and the adapter, and reduce the damage of the tab during the welding process of the electrode terminal and the adapter, so that the tab, the adapter and the electrode terminal can be connected together more stably.

[0043] In some embodiments, the distance between the avoidance through hole and the main body is L, and the distance between the edge of the tab away from the main body and the main body is h, wherein 5 mm ≤ L < h.

[0044] By adopting the technical solution of this embodiment, the design of 5mm≤L<h can ensure that the avoidance through hole is at a certain distance from the main body to facilitate the bending of the tab, and the avoidance through hole and the terminal welding area are arranged relative to each other to reduce damage to the tab.

[0045] In some embodiments, 8 mm ≤ L ≤ 15 mm.

[0046] By adopting the technical solution of this embodiment, the design of 8mm≤L<15mm can better take into account the welding between the tab and the adapter and the electrode terminal and the adapter, which is beneficial to improving the connection reliability between the tab, the adapter and the electrode terminal.

[0047] In some embodiments, the tab welding region is ultrasonically welded to the tab; and / or the terminal welding region is laser welded to the electrode terminal.

[0048] By adopting the technical solution of this embodiment, it is beneficial to improve the connection reliability between the tab and the electrode terminal, thereby improving the performance and reliability of the battery cell.

[0049] In a second aspect, a battery is provided, comprising the battery cell as described in the above embodiment.

[0050] In a third aspect, an electrical device is provided, comprising the battery as described in the above embodiment.

[0051] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0053] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application.

[0054] FIG2 is a schematic diagram of the exploded structure of a battery provided in some embodiments of the present application.

[0055] FIG3 is a schematic structural diagram of a battery cell provided in some embodiments of the present application.

[0056] FIG4 is a schematic diagram of the exploded structure of the battery cell shown in FIG3 .

[0057] FIG5 is a schematic structural diagram of the end cap, adapter, and electrode assembly of a battery cell provided in other embodiments of the present application.

[0058] FIG6 is a schematic diagram of welding the electrode tab and the adapter of the electrode assembly shown in FIG5 .

[0059] FIG7 is a schematic diagram of welding the tabs and adapters of the electrode assembly provided in some other embodiments of the present application.

[0060] FIG8 is a schematic diagram of welding the tabs and adapters of the electrode assembly provided in some other embodiments of the present application.

[0061] FIG9 is a schematic diagram of welding the tabs and adapters of the electrode assembly provided in some other embodiments of the present application.

[0062] FIG10 is a schematic structural diagram of the electrode tabs of an electrode assembly provided in some other embodiments of the present application before being bent.

[0063] Among them, the figure marks in the figure are: 1000, vehicle; 1100, battery; 1200, controller; 1300, motor; 100, battery cell; 10, shell; 11, end cover; 12, shell; 20, electrode assembly; 21, main body; 22, tab; 221, avoidance gap; 222, overlapping part; 223, avoidance through hole; 30, adapter; 31, tab welding area; 311, tab welding sub-area; 32, terminal welding area; 40, electrode terminal; 50, pressure relief mechanism; 200, box; 210, first part; 220, second part. DETAILED DESCRIPTION

[0064] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0065] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0066] In the description of the embodiments of this application, the technical terms "first," "second," etc., are used solely to distinguish between different objects and should not be understood to indicate or imply relative importance, or to implicitly specify the quantity, specific order, or primary-secondary relationship of the technical features indicated. Therefore, a feature designated "first" or "second" may explicitly or implicitly include one or more of such features.

[0067] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments in any suitable manner.

[0068] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0069] In the description of the embodiments of this application, the term "plurality" refers to two or more (including two). Similarly, "multiple groups" refers to two or more (including two groups), and "multiple sheets" refers to two or more (including two sheets). "Several" means one or more, unless otherwise specifically defined.

[0070] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting the embodiments of the present application.

[0071] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0072] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, when an element is referred to as being “fixed to” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0073] The battery referred to in the embodiments of this application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. A battery generally includes a housing that encloses one or more battery cells. The housing can, to a certain extent, prevent liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0074] In a battery, when there are multiple battery cells, they can be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections. Multiple battery cells can be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery cell structure is housed within a housing. Alternatively, a battery can be constructed by first connecting multiple battery cells in series, in parallel, or in a hybrid connection to form a battery module, which is then connected in series, in parallel, or in a hybrid connection to form a single unit, which is then housed within a housing. The battery may also include other structures, such as a busbar assembly for electrically connecting multiple battery cells.

[0075] A battery cell usually includes a shell and an electrode assembly and an adapter arranged in the shell. The shell is provided with electrode terminals for outputting or inputting electrical energy. The tabs of the electrode assembly are welded to the adapter, and the adapter is welded to the electrode terminals, thereby realizing electrical connection between the electrode terminals and the electrode assembly to facilitate the input and output of electrical energy into and out of the battery cell.

[0076] In some cases, the adapter includes a terminal welding part and multiple tab welding parts, and the multiple tab welding parts are arranged at intervals and connected to the same side of the terminal welding part. The tab welding parts are welded to the tabs, and the terminal welding parts are welded to the electrode terminals. The welding positions of the tab welding parts and the tabs and the flux positions of the terminal welding parts and the electrode terminals are far apart, resulting in large ohmic impedance of the battery cell, poor overcurrent, and increased heat generation, which seriously affects the performance of the battery cell.

[0077] Based on this, an embodiment of the present application provides a battery cell, in which the terminal welding area of ​​the adapter is welded to the electrode terminal, and the tab welding area of ​​the adapter is welded to the tab, so as to realize the input or output of electrical energy of the battery cell; and the tab welding area includes at least two tab welding sub-areas, and the terminal welding area is located between the two tab welding sub-areas, which can make the welding position of the tab and the adapter and the welding position of the adapter and the electrode terminal closer, thereby reducing the ohmic impedance, reducing the overcurrent distance, reducing the heat generation, and improving the performance of the battery cell.

[0078] The technical solutions described in the embodiments of the present application are applicable to batteries and electrical devices using batteries.

[0079] Batteries are widely used in a variety of electronic devices, including mobile phones, laptops, electric bicycles, electric cars, electric airplanes, electric boats, electric toy cars, electric toy boats, electric toy planes, and power tools. Batteries are devices that store and release electrical energy, providing the power required by these electronic devices. Batteries can also be energy storage devices, such as energy storage containers and energy storage cabinets.

[0080] Electrical devices may include vehicles, mobile phones, portable devices, laptop computers, ships, spacecraft, electric toys, and electric tools, among others. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, among others; electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, among others; and electric 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, among others. The embodiments of the present application do not impose any particular restrictions on the above-mentioned electrical devices.

[0081] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device in some embodiments of the present application.

[0082] Please refer to Figure 1, which is a schematic structural diagram of a vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 1100 is provided inside the vehicle 1000, and the battery 1100 can be provided at the bottom, head or tail of the vehicle 1000. The battery 1100 can be used to power the vehicle 1000. For example, the battery 1100 can serve as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 1200 and a motor 1300. The controller 1200 is used to control the battery 1100 to power the motor 1300, for example, for starting, navigating and driving the vehicle 1000.

[0083] In some embodiments of the present application, the battery 1100 can serve not only as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0084] Please refer to Figure 2, which is a schematic diagram of the structure of a battery 1100 provided in some embodiments of the present application. The battery 1100 includes a housing 200 and a battery cell 100, with the battery cell 100 housed within the housing 200. The housing 200 is used to provide a storage space for the battery cell 100 and can have various structures. In some embodiments, the housing 200 can include a first portion 210 and a second portion 220, which overlap with each other and together define a storage space for the battery cell 100. The second portion 220 can be a hollow structure with one end open. The first portion 210 can be a plate-like structure, with the first portion 210 overlapping the open side of the second portion 220, so that the first portion 210 and the second portion 220 together define a storage space. Alternatively, the first portion 210 and the second portion 220 can each be a hollow structure with one end open, with the open side of the first portion 210 overlapping the open side of the second portion 220. Of course, the box body 200 formed by the first part 210 and the second part 220 can be in various shapes, such as a cylinder, a cuboid, etc.

[0085] In the battery 1100 , there may be multiple battery cells 100 , and the multiple battery cells 100 may be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells 100 are connected in both series and in parallel.

[0086] In some embodiments, multiple battery cells 100 may be directly connected in series, parallel, or hybrid, and the entire battery cell 100 may then be housed within the housing 200. Alternatively, the battery 1100 may be constructed by first connecting multiple battery cells 100 in series, parallel, or hybrid to form a battery module 1100, and then connecting multiple battery modules 1100 in series, parallel, or hybrid to form an entire battery cell 1100, which may then be housed within the housing 200. The battery 1100 may also include other structures, such as a busbar assembly for electrically connecting the multiple battery cells 100.

[0087] In some embodiments, the battery 1100 may not include the housing 200 , but rather multiple battery cells 100 are electrically connected and formed into a whole through necessary fixing structures before being assembled into an electrical device.

[0088] In the present application, the battery cell 100 may include a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery, a lithium metal battery, or a magnesium-ion battery, etc., and the embodiments of the present application do not limit this. The battery cell 100 may be cylindrical, flat, rectangular, or other shapes, and the embodiments of the present application do not limit this. The battery cell 100 is generally divided into three types according to the packaging method: cylindrical battery cells, prismatic battery cells, and soft-pack battery cells, and the embodiments of the present application do not limit this.

[0089] Please refer to Figures 3 to 6. Figure 3 is a schematic diagram of the structure of a battery cell 100 provided in some embodiments of the present application. Figure 4 is a schematic diagram of the exploded structure of the battery cell 100 shown in Figure 3. Figure 5 is a schematic diagram of the structure of the end cap 11, adapter 30, and electrode assembly 20 of the battery cell 100 provided in other embodiments of the present application. Figure 6 is a schematic diagram of the welding of the tab 22 of the electrode assembly 20 shown in Figure 5 to the adapter 30.

[0090] Referring to Figures 3 and 4 , the battery cell 100 includes a housing 10 and an electrode assembly 20. The housing 10 is a shell 12 with a space inside to accommodate and protect the electrode assembly 20. The housing 10 can be made of a material with a certain degree of hardness and strength. This prevents the housing 10 from deforming when subjected to compression or collision, thus providing the battery cell 100 with greater structural strength and improved reliability.

[0091] For example, the housing 10 includes an end cap 11 and a shell 12. The end cap 11 is a component that covers the opening of the shell 12 to isolate the internal environment of the battery cell 100 from the external environment. Without limitation, the shape of the end cap 11 can be adapted to the shape of the shell 12 to match the shell 12. Optionally, the end cap 11 can be made of a material with a certain hardness and strength (such as aluminum alloy). In this way, the end cap 11 is less likely to deform when squeezed or collided, so that the battery cell 100 can have a higher structural strength and improved safety performance.

[0092] The housing 12 is a component that cooperates with the end cap 11 to form an internal environment for the battery cell 100. This internal environment can be used to accommodate the electrode assembly 20, electrolyte, and adapter 30. The housing 12 and end cap 11 can be separate components. An opening can be provided in the housing 12, and the end cap 11 is placed over the opening to form the internal environment of the battery cell 100. Alternatively, the end cap 11 and housing 12 can be integrated. Specifically, the end cap 11 and housing 12 can form a common connection surface before other components are inserted into the housing. When the interior of the housing 12 needs to be encapsulated, the end cap 11 is placed over the housing 12. The housing 12 can have a variety of shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the housing 12 can be determined based on the specific shape and size of the electrode assembly 20. The housing 12 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose any particular limitations on this.

[0093] The electrode assembly 20 is the component in the battery cell 100 where the electrochemical reaction occurs. One or more electrode assemblies 20 may be contained within the housing 12. The electrode assembly 20 comprises a positive electrode sheet, a negative electrode sheet, and a separator. During the charge and discharge process of the battery cell 100, active ions (such as lithium ions) are embedded in and released from the positive electrode sheet and the negative electrode sheet. The separator is provided between the positive electrode sheet and the negative electrode sheet to prevent a short circuit between the positive and negative electrodes while allowing active ions to pass through.

[0094] The positive electrode sheet includes a positive current collector and a positive active material layer. The positive active material layer is applied to the surface of the positive electrode collector. The portion of the positive electrode collector not coated with the positive active material layer protrudes from the portion coated with the positive active material layer. This portion serves as the positive electrode tab, or a metal conductor is welded to the positive electrode collector and extended to serve as the positive electrode tab. For lithium-ion batteries, for example, the positive electrode current collector can be made of aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide. The negative electrode sheet includes a negative current collector and a negative active material layer. The negative active material layer is applied to the surface of the negative electrode collector. The portion of the negative electrode collector not coated with the negative active material layer protrudes from the portion coated with the negative active material layer. This portion serves as the negative electrode tab, or a metal conductor is welded to the negative electrode collector and extended to serve as the negative electrode tab. The negative electrode current collector can be made of copper, and the negative electrode active material can be carbon, silicon, or other materials. To ensure that high currents can flow without melting, multiple positive electrode tabs are stacked together, and multiple negative electrode tabs are stacked together. It is understood that in the electrode assembly 20, there can be one positive electrode tab and one negative electrode tab. In other words, the electrode assembly 20 is provided with two sets of tabs, each set including at least one tab 22, with one set of tabs being the positive electrode tab and the other set of tabs being the negative electrode tab. The portion of the electrode assembly 20 comprising the current collector constitutes the main body 21 of the electrode assembly 20.

[0095] The electrode assembly 20 can be a wound structure or a laminated structure. In the wound structure, the tabs 22 are usually welded to the current collector, and then arranged in the order of positive electrode sheet - diaphragm - negative electrode sheet - diaphragm; and then wound to form a cylindrical or square battery cell. In the laminated structure, the tabs 22 are usually drawn out on the current collector, and the positive electrode sheet, negative electrode sheet and diaphragm are arranged in the order of positive electrode sheet - diaphragm - negative electrode sheet - diaphragm, and stacked together layer by layer to form a laminated battery cell; wherein, the diaphragm can be cut and directly laminated with the diaphragm sheet, or the diaphragm is not cut, but is folded in a Z shape. The material of the diaphragm can be PP (Polypropylene, polypropylene) or PE (Polyethylene, polyethylene), etc. The separator is an insulating film placed between the positive and negative electrodes. Its main function is to separate the positive and negative electrodes and prevent electrons from freely passing through the battery 1100, thus preventing short circuits to a certain extent. However, it allows ions in the electrolyte to pass freely between the positive and negative electrodes, forming a circuit between them. The positive and negative electrodes are collectively referred to as the electrodes.

[0096] The battery cell 100 has electrode terminals 40 mounted on the outer casing 10. These are conductive components mounted on the outer casing 10. These terminals are connected to the tabs 22 of the electrode assembly 20 to output power from the battery cell 100 or charge the battery cell 100. A battery cell 100 typically has two electrode terminals 40, one connected to the positive and negative tabs of the electrode assembly 20, respectively. The electrode terminal 40 connected to the positive tab is the positive electrode terminal, while the electrode terminal 40 connected to the negative tab is the negative electrode terminal.

[0097] For example, the two electrode terminals 40 may be disposed on the end cover 11 , or may be disposed on the housing 12 and the end cover 11 respectively, or may be disposed on different side walls of the housing 12 .

[0098] A pressure relief mechanism 50 is provided on the housing 10 of the battery cell 100. The pressure relief mechanism 50 is used to release the internal pressure when the internal pressure or temperature of the battery cell 100 reaches a threshold value, thereby improving the reliability of the battery 1100.

[0099] For example, the pressure relief mechanism 50 may be provided on the end cover 11 or on the housing 12 .

[0100] 4 and 5 , the battery cell 100 further includes an adapter 30, which refers to a conductive member disposed within the housing 10. The adapter 30 is welded to the tab 22 and the electrode terminal 40 to achieve connection between the tab 22 and the electrode terminal 40. The battery cell 100 generally has two adapters 30, which are divided into a positive adapter and a negative adapter. The positive tab and the positive electrode terminal are welded to the positive adapter, and the negative tab and the negative electrode terminal are welded to the negative adapter to achieve electrical energy output or input of the battery cell 100.

[0101] For the sake of convenience, the positive electrode tab and the negative electrode tab are collectively referred to as the tab 22, the positive electrode terminal and the negative electrode terminal are collectively referred to as the electrode terminal 40, and the positive adapter and the negative adapter are collectively referred to as the adapter 30; that is, the tab 22 mentioned below can refer to the positive electrode tab or the negative electrode tab; when the tab 22 refers to the positive electrode tab, the electrode terminal 40 refers to the positive electrode terminal, and the adapter 30 refers to the positive adapter; when the tab 22 refers to the negative electrode tab, the electrode terminal 40 refers to the negative electrode terminal, and the adapter 30 refers to the negative adapter.

[0102] 5 and 6 , in some embodiments of the present application, a battery cell 100 is provided, which includes a housing 10, an electrode assembly 20 and an adapter 30. The housing 10 is provided with an electrode terminal 40 for outputting or inputting electrical energy. The electrode assembly 20 is located in the housing 10. The electrode assembly 20 includes a main body 21 and a tab 22 connected to the end of the main body 21. The adapter 30 is located in the housing 10. The adapter 30 is provided with a tab welding area 31 for welding to the tab 22. The adapter 30 is also provided with a terminal welding area 32 for welding to the electrode terminal 40. The tab welding area 31 includes at least two tab welding sub-areas 311. The terminal welding area 32 is located between the two tab welding sub-areas 311.

[0103] The tab welding area 31 may refer to the area of ​​the adapter 30 used for welding to the tab 22. For example, after the tab 22 is welded to the adapter 30, a first welding structure is formed on the adapter 30. The area occupied by the first welding structure on the adapter 30 is called the tab welding area 31. The first welding structure may be a weld seam, a weld spot, a weld mark, or other structures.

[0104] The tab welding area 31 includes at least two tab welding sub-areas 311. The tab welding sub-areas 311 may refer to a portion of the tab welding area 31. The number of tab welding sub-areas 311 may be two, three, or more than four. For example, the tab welding sub-area 311 may refer to the area occupied by a portion of the first welding structure on the adapter 30.

[0105] The terminal welding area 32 may refer to the area of ​​the adapter 30 used for welding to the electrode terminal 40. For example, after the electrode terminal 40 is welded to the adapter 30, a second welding structure is formed on the adapter 30. The area occupied by the second welding structure on the adapter 30 is called the terminal welding area 32. The second welding structure may be a weld, a weld spot, a weld mark, or other structures.

[0106] For the convenience of illustration, in Figures 6 to 9 , the tab welding area 31 and the tab welding sub-area 311 are represented by dashed boxes, and the first welding structure and the second welding structure are represented by circles.

[0107] The terminal welding area 32 is located between the two tab welding sub-areas 311 . It can be understood that the tab welding sub-areas 311 are provided on both opposite sides of the terminal welding area 32 .

[0108] For example, the number of the tab welding sub-regions 311 is two, and the terminal welding region 32 is located between the two tab welding sub-regions 311 .

[0109] In the battery cell 100 of the embodiment of the present application, the tab 22 of the electrode assembly 20 is welded to the tab welding area 31 of the adapter 30, and the electrode pin of the shell 10 is welded to the terminal welding area 32 of the adapter 30, which can realize the electrical connection between the tab 22 and the electrode terminal 40, thereby realizing the input or output of electric energy of the battery cell 100; and the tab welding area 31 includes at least two tab welding sub-areas 311, and the terminal welding area 32 is located between the two tab welding sub-areas 311, which can make the welding position of the tab 22 and the adapter 30 and the welding position of the adapter 30 and the electrode terminal 40 closer, thereby reducing the ohmic impedance, reducing the overcurrent distance, reducing the heat generation, and improving the performance of the battery cell 100.

[0110] In some embodiments, the adapter 30 is a sheet-like structure, and the terminal welding area 32 is located between at least two tab welding sub-areas 311, so that the adapter 30 with the tab 22 welding portions spaced apart is changed to a quadrilateral adapter sheet structure.

[0111] In some other embodiments of the present application, the tab welding area 31 is ultrasonically welded to the tab 22 ; and / or the terminal welding area 32 is laser welded to the electrode terminal 40 .

[0112] Ultrasonic welding utilizes high-frequency vibration energy for welding, a technique that falls within the field of power ultrasound. During ultrasonic welding, alternating current is first converted into a high-frequency signal. This high-frequency mechanical vibration is then transmitted to the workpieces via a transducer. The vibrations create frictional heat in the contact area between the workpieces, melting the plastic or metal. Ultrasonic welding can be used to weld thermoplastics as well as metals.

[0113] Laser welding utilizes the thermal energy of a laser beam to perform welding. During the laser welding process, a laser beam is focused onto the weld joint. The high-energy-density laser beam rapidly heats the weld joint to a melting or fusion temperature. The weld material melts rapidly under the laser beam, forming a weld. Laser welding can be used to weld metals, plastics, and other materials.

[0114] In one possible embodiment, the tab welding area 31 and the tab 22 are ultrasonically welded. It is understandable that the tab 22 is usually thin, and the tab welding area 31 and the tab 22 are welded by ultrasonic welding. Ultrasonic welding causes little damage to the tab 22, and the welding quality of the tab 22 and the adapter 30 is good, and the connection reliability is good.

[0115] In another possible embodiment, the terminal welding area 32 and the electrode terminal 40 are laser welded. It can be understood that the terminal welding area 32 and the electrode terminal 40 are welded by laser welding, and the welding quality of the terminal welding area 32 and the electrode terminal 40 is high and the connection reliability is good.

[0116] In another possible embodiment, the tab welding area 31 is ultrasonically welded to the tab 22; and / or the terminal welding area 32 is laser welded to the electrode terminal 40. This design enables the adapter 30 to be stably and reliably connected to the tab 22 and the electrode terminal 40, which is beneficial to improving the performance and reliability of the battery cell 100.

[0117] By adopting the technical solution of this embodiment, the connection reliability between the tab 22 and the electrode terminal 40 is improved, thereby improving the performance and reliability of the battery cell 100.

[0118] In other embodiments of the present application, referring to FIG. 5 and FIG. 6 , the terminal welding region 32 is spaced apart from the adjacent tab welding sub-region 311 .

[0119] It can be understood that there is a gap between the terminal welding area 32 and the adjacent tab welding sub-area 311 , that is, the terminal welding area 32 and the adjacent tab welding sub-area 311 do not overlap.

[0120] By adopting the technical solution of this embodiment, the gap between the terminal welding area 32 and the tab welding sub-area 311 can reduce the impact of the welding between the electrode terminal 40 and the adapter 30 on the tab 22 and the tab welding sub-area 311, which is beneficial to improving the welding quality, improving the connection reliability of the adapter 30, the tab 22 and the electrode terminal 40, and improving the performance and reliability of the battery cell 100.

[0121] In some embodiments, the terminal welding region 32 may also partially overlap with the tab welding sub-region 311 .

[0122] In other embodiments of the present application, referring to FIG. 5 and FIG. 6 , the distance between the terminal welding region 32 and the adjacent tab welding sub-region 311 is H, where 0 mm ≤ H ≤ 10 mm.

[0123] A distance H is provided between opposite edges of the terminal welding region 32 and the adjacent tab welding sub-region 311 .

[0124] 0mm≤H≤10mm, it can be understood that, H=0mm, the edges of the terminal welding area 32 and the adjacent tab welding sub-area 311 are connected to each other; 0mm<H≤10mm, it can be understood that there is a gap between the terminal welding area 32 and the adjacent tab welding sub-area 311, and the width of the gap is less than or equal to 10mm, so that the distance between the terminal welding area 32 and the tab welding sub-area 311 is not too large, which is beneficial to reducing ohmic impedance, reducing overcurrent distance, reducing heat generation, and improving the performance of the battery cell 100.

[0125] By adopting the technical solution of this embodiment, the design of 0mm≤H≤10mm makes the spacing between the terminal welding area 32 and the adjacent tab welding sub-area 311 appropriate, which is beneficial to reducing ohmic impedance, reducing overcurrent distance, reducing heat generation, and improving the performance of the battery cell 100.

[0126] In other embodiments of the present application, referring to FIG. 5 and FIG. 6 , 5 mm ≤ H ≤ 8 mm.

[0127] 5mm≤H≤8mm. It can be understood that when H≥5mm, there is a certain distance between the terminal welding area 32 and the adjacent tab welding sub-area 311, which can reduce the impact of the welding between the electrode terminal 40 and the adapter 30 on the tab 22 and the tab welding sub-area 311, which is beneficial to improving the welding quality, improving the connection reliability of the adapter 30, the tab 22 and the electrode terminal 40, and improving the performance and use reliability of the battery cell 100; H≤8mm makes the distance between the terminal welding area 32 and the tab welding sub-area 311 smaller, which can better reduce the ohmic impedance, reduce the overcurrent distance, reduce the heat generation, and improve the performance of the battery cell 100.

[0128] By adopting the technical solution of this embodiment, the design of 5mm≤H≤8mm makes the spacing between the terminal welding area 32 and the adjacent tab welding sub-area 311 more reasonable, which is beneficial to reducing the impact of the welding of the electrode terminal 40 and the adapter 30 on the tab 22 and the tab welding sub-area 311, improving the welding quality, and improving the connection reliability of the adapter 30, the tab 22 and the electrode terminal 40. It is also beneficial to reduce ohmic impedance, reduce overcurrent distance, reduce heat generation, and improve the performance of the battery cell 100.

[0129] In some embodiments, the value of H can be 0mm, 10mm, and any number between 0mm and 10mm. For example, the value of H can be but is not limited to 0mm, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, and 10mm.

[0130] Please refer to Figures 7 to 9. Figure 7 is a schematic diagram of welding the electrode tab 22 of the electrode assembly 20 and the adapter 30 provided in some other embodiments of the present application. Figure 8 is a schematic diagram of welding the electrode tab 22 of the electrode assembly 20 and the adapter 30 provided in some other embodiments of the present application. Figure 9 is a schematic diagram of welding the electrode tab 22 of the electrode assembly 20 and the adapter 30 provided in some other embodiments of the present application.

[0131] In other embodiments of the present application, referring to FIG. 5 , FIG. 6 and FIG. 7 , a plurality of tab welding sub-regions 311 are arranged at intervals along the first direction.

[0132] It can be understood that the plurality of tab welding sub-regions 311 are arranged along the first direction, and a gap exists between two adjacent tab welding sub-regions 311 .

[0133] For example, referring to Figures 5 and 6, the electrode assembly 20 has a flat structure, and the electrode assembly 20 has a length direction, a width direction and a height direction. The length direction of the electrode assembly 20 can be referred to the Y direction in Figure 5, the width direction of the electrode assembly 20 can be referred to the X direction in Figure 5, and the height direction of the electrode assembly 20 can be referred to the Z direction in Figure 5; the shape of the electrode assembly 20 is determined by the shape of the main body 21, the length direction of the electrode assembly 20 is the length direction of the main body 21, the width direction of the electrode assembly 20 is the width direction of the main body 21, and the height direction of the electrode assembly 20 is the height direction of the main body 21.

[0134] Referring to FIG5 , the welding process of the tab 22 and the adapter 30 is as follows: the tab 22 is extended from the upper end of the main body 21, the adapter 30 is located above the main body 21, and the upper portion of the tab 22 is bent and covered on the adapter 30, or the adapter 30 is covered on the bent upper portion of the tab 22 before welding. Specifically, two tabs 22 are welded to the adapter 30. Before the tabs 22 are bent, the two tabs 22 are located on opposite sides of the adapter 30. Then, the upper portions of the two tabs 22 are bent relative to each other and covered on the adapter 30, or the adapter 30 is covered on the bent upper portion of the tab 22, and then the upper portions of the two tabs 22 are welded to the adapter 30.

[0135] Referring to Figures 5 and 6 , the first direction is the length direction of the electrode assembly 20, i.e., the multiple tab welding sub-regions 311 are arranged at intervals along the length direction of the electrode assembly 20. Alternatively, referring to Figure 7 , the first direction is the width direction of the electrode assembly 20, and the multiple tab welding sub-regions 311 can be arranged at intervals along the width direction of the electrode assembly 20. This arrangement can facilitate welding operations and improve welding efficiency and quality. Of course, in other embodiments, the multiple tab welding sub-regions 311 can also be arranged at intervals along other directions.

[0136] By adopting the technical solution of this embodiment, multiple tab welding sub-areas 311 are arranged at intervals, so that there is a gap between two adjacent tab welding sub-areas 311. The setting of the gap can provide accommodation space for the terminal welding area 32, and can also reduce the risk of overlap between the tab welding sub-area 311 and the terminal welding area 32, reduce the impact of the welding of the electrode terminal 40 and the adapter 30 on the tab 22 and the tab welding sub-area 311, improve the welding quality, and improve the connection reliability of the adapter 30, the tab 22 and the electrode terminal 40; in addition, the tab welding sub-area 311 is simply arranged, which is conducive to improving welding efficiency.

[0137] In other embodiments of the present application, referring to FIG. 8 , a plurality of tab welding sub-regions 311 are arranged in a ring shape along the circumference of the terminal welding region 32 .

[0138] It is understood that the multiple tab welding sub-areas 311 are arranged along the circumference of the terminal welding area 32 and are disposed around the outer periphery of the terminal welding area 32. The number of tab welding sub-areas 311 can be, but is not limited to, three, four, or five. The multiple tab welding sub-areas 311 can be arranged to form a polygonal structure such as a triangle, a quadrilateral, or a pentagon. Of course, the multiple tab welding sub-areas 311 can also be arranged to form a circular, elliptical, or other structure.

[0139] By adopting the technical solution of this embodiment, multiple tab welding sub-areas 311 are arranged in a ring shape along the circumference of the terminal welding area 32, so that the terminal welding area 32 is located inside the tab welding area 31. The distance between the terminal welding area 32 and the tab welding sub-area 311 is close, the overcurrent distance is short, the ohmic impedance is small, and the heat generation is small, which is more conducive to improving the performance of the battery cell 100; in addition, the welding area between the tab 22 and the adapter 30 is large, and the welding reliability between the tab 22 and the adapter 30 is good, which is conducive to improving the reliability and performance of the battery cell 100.

[0140] In other embodiments of the present application, referring to FIG. 8 , two adjacent tab welding sub-regions 311 are arranged at intervals; or, two adjacent tab welding sub-regions 311 are connected.

[0141] It can be understood that there is a gap between the ends of two adjacent tab welding sub-areas 311 that are close to each other, that is, multiple tab welding sub-areas 311 are arranged to form a disconnected ring structure; the ends of two adjacent tab welding sub-areas 311 that are close to each other are connected, that is, there is no gap between the ends of two adjacent tab welding sub-areas 311 that are close to each other, that is, multiple tab welding sub-areas 311 are arranged to form a closed ring structure.

[0142] For example, referring to Figure 8, the number of tab welding sub-areas 311 is four, the upper and lower tab welding sub-areas 311 are located on the upper and lower sides of the terminal welding area 32, and the left and right tab welding sub-areas 311 are located on the left and right sides of the terminal welding area 32. The four tab welding sub-areas 311 are connected end to end in sequence to form a quadrilateral structure, which is surrounded by the terminal welding area 32.

[0143] By adopting the technical solution of this embodiment, a plurality of tab welding sub-areas 311 can be flexibly arranged to meet the performance requirements of different battery cells 100 .

[0144] In other embodiments of the present application, referring to Figures 6 and 7, the adapter 30 is welded with multiple tabs 22 with the same polarity, and the multiple tabs 22 with the same polarity are used to be welded one-to-one with multiple tab welding sub-areas 311; or, the adapter 30 is welded with multiple tabs 22 with the same polarity, and the number of tab welding areas 31 is multiple, and the multiple tabs 22 with the same polarity are used to be welded one-to-one with multiple tab welding areas 31.

[0145] The plurality of tabs 22 with the same polarity may refer to a plurality of positive electrode tabs or a plurality of negative electrode tabs.

[0146] The adapter 30 is welded with multiple pole tabs 22 with the same polarity. It can be understood that when an electrode assembly 20 has multiple pole tabs 22 with the same polarity, these pole tabs 22 with the same polarity are all welded on one adapter 30; when there are multiple electrode assemblies 20 in the battery cell 100, the pole tabs 22 with the same polarity of multiple electrode assemblies 20 are welded on one adapter 30.

[0147] For example, referring to FIG5 and FIG6 , two electrode assemblies 20 are provided in the battery cell 100 . Two electrode tabs 22 with the same polarity are led out from the two electrode assemblies 20 . The two tabs 22 are welded to the same adapter 30 to improve welding efficiency.

[0148] In one possible embodiment, referring to Figures 7 and 9 , the adapter 30 is welded with multiple tabs 22 of the same polarity, and the multiple tabs 22 of the same polarity are used to be welded one-to-one with multiple tab welding sub-areas 311. It can be understood that the area where a tab 22 is welded to the adapter 30 is called a tab welding sub-area 311, and the entire area where multiple tabs 22 are welded to the adapter 30 is called a tab welding area 31. That is, the adapter 30 has one tab welding area 31, and each tab welding area 31 includes multiple tab welding sub-areas 311, and the multiple tab welding sub-areas 311 are welded one-to-one with multiple tabs 22 of the same polarity.

[0149] For example, referring to Figure 7, the adapter 30 is welded with two tabs 22 of the same polarity. The adapter 30 is provided with a tab welding area 31. The tab welding area 31 includes two tab welding sub-areas 311. The two tab welding sub-areas 311 are arranged up and down and are respectively welded to the two tabs 22 arranged up and down. The terminal welding area 32 is located between the two tab welding sub-areas 311.

[0150] In another possible embodiment, referring to FIG6 , the adapter 30 is welded with multiple tabs 22 of the same polarity, and the number of tab welding areas 31 is multiple, and multiple tabs 22 of the same polarity are used to be welded one-to-one with multiple tab welding areas 31; it can be understood that the welding area between a tab 22 and the adapter 30 is called a tab welding area 31, and multiple tabs 22 are welded to the adapter 30 to form multiple tab welding areas 31; that is, the adapter 30 is provided with multiple tab welding areas 31, and multiple tab welding areas 31 are welded one-to-one with multiple tabs 22 of the same polarity, and each tab welding area 31 is correspondingly provided with a terminal welding area 32, that is, the electrode terminal 40 and the adapter 30 have multiple welding points, and the welding reliability of the electrode terminal 40 and the adapter 30 is good.

[0151] For example, referring to Figure 6, the adapter 30 is welded with two tabs 22 of the same polarity. The adapter 30 is provided with two tab welding areas 31. The two tab welding areas 31 are arranged up and down. The two tab welding areas 31 are respectively welded to the two tabs 22 arranged up and down. Each tab welding area 31 includes two tab welding sub-areas 311 arranged on the left and right. A terminal welding area 32 is provided between the two tab welding sub-areas 311 arranged on the left and right, that is, the adapter 30 and the electrode terminal 40 are welded with two terminal welding areas 32 arranged up and down.

[0152] By adopting the technical solution of this embodiment, the connection method between the adapter 30, the tab 22 and the electrode terminal 40 can be flexibly set to meet the requirements of different battery cells 100.

[0153] In other embodiments of the present application, referring to Figures 6, 7 and 9, when multiple tabs 22 with the same polarity are welded to multiple tab welding sub-areas 311 in a one-to-one correspondence, at least one tab 22 covers at least a portion of the corresponding tab welding sub-area 311; when multiple tabs 22 with the same polarity are welded to multiple tab welding areas 31 in a one-to-one correspondence, at least one tab 22 covers at least a portion of the corresponding tab welding area 31.

[0154] “At least one electrode tab 22 ” may refer to one, two, or three electrode tabs 22 , and may refer to a portion of the electrode tabs 22 or all of the electrode tabs 22 .

[0155] “At least a portion of the tab welding sub-region 311 ” may refer to a portion of the tab welding sub-region 311 , or may refer to the entire tab welding sub-region 311 .

[0156] “At least a portion of the tab welding region 31 ” may refer to a portion of the tab welding region 31 , or may refer to the entire tab welding region 31 .

[0157] In one possible embodiment, when multiple tabs 22 of the same polarity are welded to multiple tab welding sub-regions 311 in a one-to-one correspondence, at least one tab 22 covers at least a portion of the corresponding tab welding sub-region 311. It is understood that at least one tab 22 covers at least a portion of the tab welding sub-region 311 to which it is welded, that is, at least one tab 22 may cover a portion of the tab welding sub-region 311 to which it is welded, or may cover the entire area of ​​the tab welding sub-region 311 to which it is welded. When the tab 22 covers the entire area of ​​the tab welding sub-region 311 to which it is welded, the welding area between the tab 22 and the adapter 30 is large, and the connection reliability between the tab 22 and the adapter 30 is good, which is conducive to improving the reliability and performance of the battery cell 100.

[0158] For example, referring to FIG. 7 , the upper and lower tabs 22 are respectively completely covered by the upper and lower tab welding sub-regions 311 , and the connection reliability between the tabs 22 and the adapter 30 is good.

[0159] For example, referring to FIG. 9 , the upper tab 22 covers the lower portion of the upper tab welding sub-region 311 , and the lower tab 22 covers the upper portion of the lower tab welding sub-region 311 .

[0160] In another possible embodiment, when multiple tabs 22 of the same polarity are welded to multiple tab welding areas 31 in a one-to-one correspondence, at least one tab 22 covers at least a portion of the corresponding tab welding area 31. It is understood that at least one tab 22 covers at least a portion of the tab welding area 31 to which it is welded, that is, at least one tab 22 may cover a portion of the tab welding area 31 to which it is welded, or may cover the entire area of ​​the tab welding area 31 to which it is welded. When the tab 22 covers the entire area of ​​the tab welding area 31 to which it is welded, the welding area between the tab 22 and the adapter 30 is large, and the connection reliability between the tab 22 and the adapter 30 is good, which is conducive to improving the reliability and performance of the battery cell 100.

[0161] For example, referring to FIG. 6 , the upper and lower tabs 22 are respectively completely covered by the upper and lower tab welding areas 31 , and the connection reliability between the tabs 22 and the adapter 30 is good.

[0162] By adopting the technical solution of this embodiment, the welding area between the tab 22 and the adapter 30 can be flexibly set to meet different usage requirements of the battery cell 100.

[0163] In other embodiments of the present application, as shown in FIG. 7 , the adapter 30 is welded with a plurality of tabs 22 of the same polarity, and the plurality of tabs 22 of the same polarity are arranged at intervals, forming an avoidance gap 221 between two adjacent tabs 22 , and the avoidance gap 221 is arranged opposite to the terminal welding area 32 .

[0164] The avoidance gap 221 may refer to the gap between two adjacent tabs 22 .

[0165] For example, referring to FIG. 7 , the gap formed between the opposite edges of the upper and lower tabs 22 is the avoidance gap 221 .

[0166] By adopting the technical solution of this embodiment, the avoidance gap 221 is arranged relative to the terminal welding area 32, so that the terminal welding area 32 is staggered with the tab 22, thereby reducing the damage to the tab 22 caused by the welding of the electrode terminal 40 and the adapter 30, which is beneficial to improving the welding quality and improving the connection reliability of the adapter 30, the tab 22 and the electrode terminal 40.

[0167] In particular, when the electrode terminal 40 and the adapter 30 are laser welded, direct laser irradiation on the tab 22 may damage the tab 22 ; however, the avoidance gap 221 allows the laser to pass through, thereby irradiating the tab 22 and reducing the risk of damage to the tab 22 .

[0168] In other embodiments of the present application, as shown in FIG. 8 , the adapter 30 is welded with a plurality of tabs 22 with the same polarity, and the plurality of tabs 22 with the same polarity are overlapped to form an overlap portion 222 , which is used to be welded to the tab welding area 31 .

[0169] It can be understood that after the plurality of tabs 22 are bent, the overlapping portion of the plurality of tabs 22 forms a lap portion 222 .

[0170] For example, referring to FIG8 , the stacked portions of the two tabs 22 above and below form a lap portion 222 , which is welded to the adapter 30 to form a quadrilateral tab welding area 31 , and the terminal welding area 32 is located inside the tab welding area 31 .

[0171] By adopting the technical solution of this embodiment, the overlapping portion 222 is formed by overlapping multiple tabs 22 . The overlapping portion 222 has a large thickness, which is beneficial to improving the welding quality and connection reliability between the tab 22 and the adapter 30 .

[0172] In some other embodiments of the present application, as shown in FIG. 9 , the edge of the tab 22 away from the main body 21 is used for welding to the tab welding sub-region 311 .

[0173] Before the tab 22 is bent, the tab 22 has two opposite sides, one of which is connected to the main body 21 , and the other is the side of the main body 21 away from the main body 21 .

[0174] For example, referring to Figure 9, the tab welding sub-area 311 includes two tab welding sub-areas 311 arranged upper and lower, the upper part of the tab 22 located on the lower side is welded to the tab welding sub-area 311 located on the upper side, and the lower part of the tab 22 located on the upper side is welded to the tab welding sub-area 311 located on the lower side, and the upper and lower tabs 22 are overlapped to form a overlapping portion 222, that is, the upper part of the overlapping portion 222 is welded to the tab welding sub-area 311 located on the upper side, and the lower part of the overlapping portion 222 is welded to the tab welding sub-area 311 located on the lower side.

[0175] By adopting the technical solution of this embodiment, the edge of the tab 22 away from the main body 21 is welded to the tab welding sub-area 311, so that the edge of the tab 22 away from the main body 21 is fixed, reducing the risk of the edge of the tab 22 being warped and damaged, and also helping to improve the reliability of the welding connection.

[0176] In some other embodiments of the present application, as shown in FIG. 9 , a position corresponding to the terminal welding area 32 of the tab 22 is provided with an avoidance through-hole 223 for avoiding the terminal welding area 32 .

[0177] The avoidance through hole 223 may be a through hole that passes through the tab 22. The avoidance through hole 223 is arranged opposite to the terminal welding area 32 so that the terminal welding area 32 and the tab 22 are staggered. The avoidance through hole 223 may have various shapes, such as circular, polygonal, elliptical, etc.

[0178] For example, referring to FIG6 , both upper and lower tabs 22 are provided with avoidance through-holes 223. The two avoidance through-holes 223 are respectively arranged opposite the middle portions of the upper and lower tab welding areas 31, allowing the tabs 22 to avoid the terminal welding area 32. During welding, the upper and lower sides of the adapter 30 are ultrasonically welded to the two tabs 22, thereby welding the tabs 22 to the adapter 30. Subsequently, laser welding is performed in the area of ​​the avoidance through-holes 223, thereby welding the adapter 30 to the electrode terminal 40.

[0179] For example, referring to FIG8 , an avoidance through-hole 223 is provided in the middle of the overlap region. The avoidance through-hole 223 is arranged opposite to the hollow hole formed by the quadrilateral tab welding area 31, so that the tab 22 can avoid the terminal welding area 32. With the design in which the terminal welding area 32 is located within the tab welding area 31, during welding, the avoidance through-holes 223 of the two tabs 22 are overlapped. Then, ultrasonic welding is performed around the overlapped avoidance through-holes 223 to weld the overlap region to the adapter 30. Then, laser welding is performed in the area of ​​the avoidance through-hole 223 to weld the adapter 30 to the electrode terminal 40.

[0180] For example, as shown in FIG9 , a clearance hole 223 is provided in the middle of the overlap region. The clearance hole 223 is located between the upper and lower tab welding sub-regions 311, allowing the tab 22 to avoid the terminal welding region 32. During welding, the clearance holes 223 of the two tabs 22 are overlapped. Then, ultrasonic welding is performed on opposite sides of the clearance hole 223 to weld the overlap region to the adapter 30. Then, laser welding is performed in the region of the clearance hole 223 to weld the adapter 30 to the electrode terminal 40. This welding method can use two ultrasonic welding operations, which reduces the number of welding operations and helps improve the production efficiency of the battery cell 100.

[0181] By adopting the technical solution of this embodiment and avoiding the setting of the through hole 223, the tab 22 can avoid the terminal welding area 32, thereby reducing the damage to the tab 22 caused by the welding of the electrode terminal 40 and the adapter 30, which is beneficial to improving the welding quality and improving the connection reliability of the adapter 30, the tab 22 and the electrode terminal 40.

[0182] In particular, when the electrode terminal 40 and the adapter 30 are laser welded, direct laser irradiation on the tab 22 may damage the tab 22 ; however, the avoidance through-hole 223 allows the laser to pass through, thereby irradiating the tab 22 and reducing the risk of damage to the tab 22 .

[0183] Please also refer to FIG. 10 , which is a schematic structural diagram of the electrode tab 22 of the electrode assembly 20 provided in some other embodiments of the present application before being bent.

[0184] In some other embodiments of the present application, referring to FIG. 10 , the area of ​​the tab 22 is S1 , and the cross-sectional area of ​​the avoidance through hole 223 is S2 , wherein 0.05≤S2 / S1≤0.25.

[0185] The area S1 of the tab 22 may refer to the area of ​​the side surface of the tab 22 along the thickness direction.

[0186] For example, the area of ​​the side of the tab 22 close to the outside of the electrode assembly 20 may refer to the area S1 of the tab 22 , that is, the area of ​​the side of the tab 22 along the thickness direction of the electrode assembly 20 may also refer to the area S1 of the tab 22 .

[0187] The cross-sectional area S2 of the avoidance through hole 223 may refer to a figure obtained by a plane perpendicular to the axis of the avoidance through hole 223 , and the area enclosed by the figure.

[0188] For example, the area of ​​the opening of the avoidance through hole 223 formed on the surface of the tab 22 may refer to the cross-sectional area S2 of the avoidance through hole 223 .

[0189] 0.05≤S2 / S1≤0.25, that is, 0.05≤S2 / S1≤0.25. It can be understood that S2≥0.05S1, which allows the through hole 223 to have a certain area, so that the welding head of the electrode terminal 40 and the adapter 30 can pass through, so as to reduce the damage of the tab 22 during the welding process of the electrode terminal 40 and the adapter 30; S2≤0.25S1, so that the tab 22 has a certain area to be welded with the adapter 30, so as to improve the reliability of welding.

[0190] By adopting the technical solution of this embodiment, the design of 0.05≤S2 / S1≤0.25 can take into account the welding reliability of the tab 22 and the adapter 30, and reduce the damage of the tab 22 during the welding process of the electrode terminal 40 and the adapter 30, so that the tab 22, the adapter 30 and the electrode terminal 40 can be stably connected together.

[0191] In other embodiments of the present application, referring to FIG. 10 , 0.1≤S2 / S1≤0.2.

[0192] 0.1S1≤S2≤0.2S1, that is, 0.1≤S2 / S1≤0.2. It can be understood that S2≥0.1S1, which allows the through hole 223 to have a larger area, so that the welding head of the electrode terminal 40 and the adapter 30 can pass through better, so as to better reduce the damage of the tab 22 during the welding process of the electrode terminal 40 and the adapter 30; S2≤0.2S1, so that the tab 22 has a larger area for welding with the adapter 30, so as to improve the reliability of welding.

[0193] By adopting the technical solution of this embodiment, the design of 0.05S1≤S2≤0.2S1 can better take into account the welding reliability of the tab 22 and the adapter 30, and reduce the damage of the tab 22 during the welding process of the electrode terminal 40 and the adapter 30, so that the tab 22, the adapter 30 and the electrode terminal 40 can be more stably connected together.

[0194] In some embodiments, the value of S2 / S1 can be 0.05, 0.25, and any number between 0.05 and 0.25. For example, the value of S2 / S1 can be but is not limited to 0.05, 0.06, 0.07, 0.09, 0.1, 0.1, 0.11, 0.12, 0.13, 0.14, 0.15, 0.16, 0.17, 0.18, 0.19, 0.2, 0.21, 0.22, 0.23, 0.24, and 0.25.

[0195] In some other embodiments of the present application, referring to FIG. 10 , the cross-sectional area of ​​the avoidance through hole 223 is S2, wherein 25 mm 2 ≤S2≤125mm 2 .

[0196] 25mm 2 ≤S2≤125mm 2 , it is understandable that S2 ≥ 25mm 2 The avoidance through hole 223 has a certain area, which allows the welding head of the electrode terminal 40 and the adapter 30 to pass through, so as to reduce the damage of the tab 22 during the welding process of the electrode terminal 40 and the adapter 30; S2≤125mm 2 , so that the tab 22 has a certain area for welding with the adapter 30 to improve the reliability of welding.

[0197] By adopting the technical solution of this embodiment, 25mm 2 ≤S2≤125mm 2 The design can simultaneously take into account the welding reliability of the tab 22 and the adapter 30, and reduce the damage of the tab 22 during the welding process of the electrode terminal 40 and the adapter 30, so that the tab 22, the adapter 30 and the electrode terminal 40 can be stably connected together.

[0198] In other embodiments of the present application, referring to FIG. 10 , 35 mm 2 ≤S2≤65mm 2 .

[0199] 35mm 2 ≤S2≤65mm 2 , it is understandable that S2 ≥ 35mm 2 The avoidance through hole 223 has a larger area, which can better allow the welding head of the electrode terminal 40 and the adapter 30 to pass through, so as to better reduce the damage of the tab 22 during the welding process of the electrode terminal 40 and the adapter 30; S2≤65mm 2 , so that the tab 22 has a larger area for welding with the adapter 30, thereby improving the reliability of welding.

[0200] By adopting the technical solution of this embodiment, 35mm 2 ≤S2≤65mm 2 The design can better take into account the welding reliability of the tab 22 and the adapter 30, and reduce the damage of the tab 22 during the welding process of the electrode terminal 40 and the adapter 30, so that the tab 22, the adapter 30 and the electrode terminal 40 can be connected together more stably.

[0201] In some embodiments, the value of S2 may be 25 mm. 2 , 125mm 2 and at 25mm 2 and 125mm 2 For example, the value of S2 can be but not limited to 25mm 2 , 30mm 2 , 35mm 2 , 40mm 2 , 45mm 2 , 50mm 2 , 55mm 2 , 60mm 2 , 65mm 2 , 70mm 2 , 75mm 2 , 80mm 2 , 85mm 2 , 90mm 2 , 95mm 2 , 100mm 2 , 105mm 2 , 110mm 2 , 115mm 2 , 120mm 2 , 125mm 2 .

[0202] In other embodiments of the present application, as shown in FIG. 10 , the distance between the avoidance through hole 223 and the main body 21 is L, and the distance between the edge of the tab 22 away from the main body 21 and the main body 21 is h, wherein 5 mm ≤ L < h.

[0203] The distance L between the avoidance through hole 223 and the main body 21 may refer to the distance between the end surface of the main body 21 and the edge of the avoidance through hole 223 close to the main body.

[0204] The distance h between the edge of the tab 22 away from the main body 21 and the main body 21 may refer to the protruding height of the tab 22 protruding from the current collector.

[0205] 5mm≤L<h. It can be understood that L≥5mm, so that the avoidance channel has a certain distance from the main body 21, which can reserve a certain space for the subsequent bending of the pole ear 22, and also facilitate the relative arrangement of the avoidance through hole 223 and the terminal welding area 32 to reduce damage to the pole ear 22. At the same time, it can also avoid the avoidance through hole 223 from being set to the main body 21, thereby improving the charging and discharging performance of the battery cell 100; L<h, so that the avoidance through hole 223 is located on the pole ear 22 to achieve avoidance.

[0206] By adopting the technical solution of this embodiment, the design of 5mm≤L<h can ensure that the avoidance through hole 223 is at a certain distance from the main body 21 to facilitate the bending of the tab 22, and the avoidance through hole 223 and the terminal welding area 32 are arranged relative to each other to reduce damage to the tab 22.

[0207] In other embodiments of the present application, referring to FIG. 10 , 8 mm ≤ L ≤ 15 mm.

[0208] 8mm≤L<15mm. It can be understood that L≥8mm, so that the avoidance channel has a larger distance from the main body 21, which can better reserve a certain space for the subsequent bending of the tab 22, and also better facilitate the relative arrangement of the avoidance through-hole 223 and the terminal welding area 32 to reduce damage to the tab 22; L<15mm, it can also make the avoidance through-hole 223 and the tab 22 away from the edge of the main body 21 have a certain distance, so as to facilitate the increase of the welding area between the tab 22 and the adapter 30, and at the same time it is also beneficial to improve the structural strength of the tab 22 and improve the reliability of the welding between the tab 22 and the adapter 30.

[0209] By adopting the technical solution of this embodiment, the design of 8mm≤L<15mm can better take into account the welding of the tab 22 and the adapter 30 as well as the welding of the electrode terminal 40 and the adapter 30, which is beneficial to improving the connection reliability between the tab 22, the adapter 30 and the electrode terminal 40.

[0210] In some embodiments, the value of L can be 5mm, h, and any number between 5mm and hmm. For example, the value of H can be but is not limited to 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, and 17mm.

[0211] The present application is described below with reference to some embodiments.

[0212] Example 1

[0213] In this embodiment, referring to Figures 5, 6 and 10, the battery cell 100 includes a shell 10, an electrode assembly 20 and an adapter 30: the shell 10 is provided with an electrode terminal 40 for outputting or inputting electrical energy; the electrode assembly 20 is located in the shell 10, and the electrode assembly 20 includes a main body 21 and a tab 22 connected to the end of the main body 21; the adapter 30 is located in the shell 10, and the adapter 30 is provided with a tab welding area 31 for welding to the tab 22, and the adapter 30 is also provided with a terminal welding area 32 for welding to the electrode terminal 40; the tab welding area 31 includes at least two tab welding sub-areas 311, and the terminal welding area 32 is located between the two tab welding sub-areas 311.

[0214] In this embodiment, the housing 10 includes a shell 12 and an end cover 11 . The end cover 11 is disposed on an opening of the shell 12 , and the electrode terminal 40 is disposed on the end cover 11 .

[0215] In this embodiment, the tab welding area 31 is ultrasonically welded to the tab 22 ; and the terminal welding area 32 is laser welded to the electrode terminal 40 .

[0216] In this embodiment, the terminal welding region 32 is spaced apart from the adjacent tab welding sub-region 311 .

[0217] In this embodiment, the distance between the terminal welding area 32 and the adjacent tab welding sub-area 311 is H, where 0 mm ≤ H ≤ 10 mm.

[0218] In this embodiment, 5 mm ≤ H ≤ 8 mm.

[0219] In this embodiment, the plurality of tab welding sub-regions 311 are arranged at intervals along a first direction, which is the length direction of the electrode assembly 20 .

[0220] In this embodiment, the adapter 30 is welded with multiple tabs 22 of the same polarity. There are multiple tab welding areas 31 . The multiple tabs 22 of the same polarity are used for welding with the multiple tab welding areas 31 in a one-to-one correspondence.

[0221] In this embodiment, when a plurality of tabs 22 with the same polarity are welded to a plurality of tab welding areas 31 in a one-to-one correspondence, at least one tab 22 covers at least a portion of the corresponding tab welding area 31 .

[0222] In this embodiment, a through hole 223 for avoiding the terminal welding area 32 is provided at a position corresponding to the terminal welding area 32 of the tab 22 .

[0223] In this embodiment, the area of ​​the tab 22 is S1, and the cross-sectional area of ​​the avoidance through hole 223 is S2, wherein 0.05≤S2 / S1≤0.25.

[0224] In this embodiment, 0.1≤S2 / S1≤0.2.

[0225] In this embodiment, the cross-sectional area of ​​the avoidance through hole 223 is S2, wherein 25 mm2≤S2≤125 mm2.

[0226] In this embodiment, 35 mm 2 ≤ S 2 ≤ 65 mm 2 .

[0227] In this embodiment, the distance between the avoidance through hole 223 and the main body 21 is L, and the distance between the edge of the tab 22 away from the main body 21 and the main body 21 is h, wherein 5 mm≤L<h.

[0228] In this embodiment, 8 mm ≤ L ≤ 15 mm.

[0229] Example 2

[0230] The difference between this embodiment and the first embodiment is that, as shown in FIG. 7 , the adapter 30 is welded with a plurality of tabs 22 with the same polarity, and the plurality of tabs 22 with the same polarity are used for welding with a plurality of tab welding sub-areas 311 in a one-to-one correspondence.

[0231] In this embodiment, the plurality of tab welding sub-regions 311 are arranged at intervals along a first direction, which is the width direction of the electrode assembly 20 .

[0232] In this embodiment, when a plurality of tabs 22 with the same polarity are welded to a plurality of tab welding sub-regions 311 in a one-to-one correspondence, at least one tab 22 covers at least a portion of the corresponding tab welding sub-region 311 .

[0233] In this embodiment, the adapter 30 is welded with multiple tabs 22 of the same polarity. The multiple tabs 22 of the same polarity are arranged at intervals, and an avoidance gap 221 is formed between two adjacent tabs 22. The avoidance gap 221 is arranged opposite to the terminal welding area 32.

[0234] Example 3

[0235] The difference between this embodiment and the second embodiment is that: as shown in FIG. 8 , the adapter 30 is welded with a plurality of tabs 22 of the same polarity, and the plurality of tabs 22 of the same polarity are overlapped to form an overlap portion 222 , which is used to be welded to the tab welding area 31 .

[0236] In this embodiment, the plurality of tab welding sub-regions 311 are arranged in a ring shape along the circumference of the terminal welding region 32 .

[0237] In this embodiment, two adjacent tab welding sub-regions 311 are connected.

[0238] Example 4

[0239] The difference between this embodiment and the third embodiment is that, as shown in FIG. 8 , a plurality of tab welding sub-regions 311 are arranged at intervals along the first direction.

[0240] In this embodiment, the edge of the tab 22 away from the main body 21 is used for welding to the tab welding sub-region 311 .

[0241] In other embodiments of the present application, a battery 1100 is provided, comprising the battery cell 100 as described in the above embodiments.

[0242] In other embodiments of the present application, an electrical device is provided, comprising the battery 1100 as described in the above embodiments.

[0243] The above description of the various embodiments tends to emphasize the differences between the various embodiments. The same or similar aspects can be referenced with each other and will not be repeated herein for the sake of brevity.

[0244] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, wherein: include: a housing provided with electrode terminals for outputting or inputting electrical energy; an electrode assembly located in the housing, the electrode assembly comprising a main body and a tab connected to an end of the main body; an adapter, located in the housing, the adapter being provided with a tab welding area for welding to the tab, and the adapter being further provided with a terminal welding area for welding to the electrode terminal; The tab welding area includes at least two tab welding sub-areas, and the terminal welding area is located between the two tab welding sub-areas.

2. The battery cell according to claim 1, wherein: The terminal welding area is spaced apart from the adjacent tab welding sub-area.

3. The battery cell according to claim 1 or 2, wherein: The distance between the terminal welding area and the adjacent tab welding sub-area is H, wherein 0mm≤H≤10mm.

4. The battery cell according to claim 3, wherein: 5mm≤H≤8mm.

5. The battery cell according to any one of claims 1 to 4, wherein: The plurality of tab welding sub-regions are arranged at intervals along the first direction.

6. The battery cell according to any one of claims 1 to 4, wherein: The plurality of tab welding sub-areas are arranged in a ring shape along the circumference of the terminal welding area.

7. The battery cell according to claim 5, wherein: Two adjacent tab welding sub-regions are arranged at intervals; or, two adjacent tab welding sub-regions are connected.

8. The battery cell according to any one of claims 1 to 6, wherein: The adapter is welded with a plurality of tabs with the same polarity, and the plurality of tabs with the same polarity are used for welding with the plurality of tab welding sub-areas in a one-to-one correspondence; Alternatively, the adapter is welded with a plurality of tabs with the same polarity, the number of the tab welding areas is multiple, and the plurality of tabs with the same polarity are used for welding with the plurality of tab welding areas in a one-to-one correspondence.

9. The battery cell according to claim 8, wherein: When a plurality of tabs with the same polarity are welded to a plurality of tab welding sub-regions in a one-to-one correspondence, at least one tab covers at least a portion of the corresponding tab welding sub-region; When a plurality of the tabs with the same polarity are welded to a plurality of the tab welding areas in a one-to-one correspondence, at least one of the tabs covers at least a portion of the corresponding tab welding area.

10. The battery cell according to any one of claims 1 to 9, wherein: The adapter is welded with a plurality of tabs with the same polarity. The plurality of tabs with the same polarity are arranged at intervals, and an avoidance gap is formed between two adjacent tabs. The avoidance gap is arranged opposite to the terminal welding area.

11. The battery cell according to any one of claims 1 to 9, wherein: The adapter is welded with a plurality of tabs with the same polarity, and the plurality of tabs with the same polarity are overlapped to form an overlap portion, and the overlap portion is used for welding with the tab welding area.

12. The battery cell according to claim 11, wherein: The edge of the tab away from the main body is used for welding with the tab welding sub-region.

13. The battery cell according to any one of claims 1 to 9, 11 and 12, wherein: A position of the tab corresponding to the terminal welding area is provided with an avoidance through-hole for avoiding the terminal welding area.

14. The battery cell according to claim 13, wherein: The area of the tab is S1, and the cross-sectional area of the avoidance through hole is S2, wherein 0.05≤S2 / S1≤0.

25.

15. The battery cell according to claim 14, wherein: 0.1≤S2 / S1≤0.

2.

16. The battery cell according to any one of claims 13 to 15, wherein: The cross-sectional area of the avoidance through hole is S2, wherein 25mm 2 ≤S2≤125mm 2 .

17. The battery cell according to claim 16, wherein: 35mm 2 ≤S2≤65mm 2 。 18. The battery cell according to any one of claims 13 to 17, wherein: The distance between the avoidance through hole and the main body is L, and the distance between the edge of the tab away from the main body and the main body is h, wherein 5 mm ≤ L < h.

19. The battery cell according to claim 18, wherein: 8mm≤L≤15mm.

20. The battery cell according to any one of claims 1 to 19, wherein: The tab welding area is ultrasonically welded to the tab; and / or the terminal welding area is laser welded to the electrode terminal.

21. A battery, wherein: The invention comprises the battery cell according to any one of claims 1 to 20.

22. An electrical device, wherein: Including the battery according to claim 21.

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