Battery cell, battery, and electric device

Abstract

The application belongs to the technical field of battery welding, and particularly relates to a battery monomer, a battery and an electric device, the battery monomer comprising a shell, an electrode assembly and an adapter, the shell being provided with an electrode terminal for outputting or inputting electric energy; the electrode assembly is located in the shell, and the electrode assembly comprises a main body and a tab connected with an end of the main body; the adapter is located in the shell, the adapter is provided with a tab welding area for welding with the tab, and the adapter is further provided with a terminal welding area for welding with the electrode terminal; the tab welding area comprises at least two tab welding sub-areas, and the terminal welding area is located between the two tab welding sub-areas, so that the welding positions of the tab and the adapter and the welding positions of the adapter and the electrode terminal are close, the ohmic resistance is reduced, the overcurrent distance is reduced, the heat generation is reduced, and the performance of the battery monomer is improved.

Description

Technical Field

[0001] This application belongs to the field of battery welding technology, and in particular relates to a battery cell, a battery, and an electrical device. Background Technology

[0002] A battery is a device that stores and releases electrical energy, providing the power needed by electronic devices. A battery typically comprises one or more individual cells to meet different power demands; the individual cell is the smallest unit that makes up the battery; the individual cell includes a casing and adapters and electrode assemblies housed within the casing, 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 achieve the input and output of electrical energy.

[0003] However, the welding positions of the electrode tabs and the adapter, as well as the welding positions of the electrode terminals and the adapter, are far apart, resulting in high ohmic impedance, poor overcurrent, and increased heat generation in the battery cells, which seriously affects the performance of the battery cells.

[0004] The above statements are for the purpose of providing background information in relation to this application only and do not necessarily constitute prior art. Summary of the Invention

[0005] The purpose of this application is to provide a battery cell, a battery, and an electrical device, including but not limited to solving the problems in the related art where the distance between the welding position of the electrode assembly tab and the adapter and the welding position of the electrode terminal and the adapter is far, resulting in high ohmic impedance, poor overcurrent, and increased heat generation in the battery cell.

[0006] The technical solution adopted in the embodiments of this application is:

[0007] In a first aspect, a battery cell is provided, the battery cell including a housing, an electrode assembly, and an adapter. The housing is provided with electrode terminals for outputting or inputting electrical energy. The electrode assembly is located inside the housing and includes a main body and tabs connected to the ends of the main body. The adapter is located inside the housing and is provided with a tab welding area for welding to the tabs, and the adapter is also provided with a terminal welding area for welding to the electrode terminals. 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.

[0008] In the battery cell of this application embodiment, the tabs of the electrode assembly are welded to the tab welding area of ​​the adapter, and the electrodes of the outer casing are welded to the terminal welding area of ​​the adapter, which can realize the electrical connection between the tabs and the electrode terminals, thereby realizing the electrical energy input or output 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 tabs and the adapter and the welding position of the adapter and the electrode terminals closer, reducing ohmic resistance, reducing overcurrent distance, reducing heat generation, and improving the performance of the battery cell.

[0009] In some embodiments, the terminal welding area is spaced apart from the adjacent tab welding sub-area.

[0010] 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 welding the electrode terminal and the adapter on the tab and the tab welding sub-area, which is conducive 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.

[0011] In some embodiments, the distance between the terminal welding area and the adjacent tab welding sub-area is H, where 0mm≤H≤10mm.

[0012] 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 conducive to reducing ohmic impedance, reducing overcurrent distance, reducing heat generation, and improving the performance of the battery cell.

[0013] In some embodiments, 5mm ≤ H ≤ 8mm.

[0014] 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. This helps to reduce the impact of welding the electrode terminal and the adapter on the tab and the tab welding sub-area, improve the welding quality, improve the connection reliability of the adapter, tab and electrode terminal, and also helps to reduce ohmic impedance, reduce overcurrent distance, reduce heat generation, and improve the performance of the battery cell.

[0015] In some embodiments, a plurality of tab welding sub-regions are arranged at intervals along a first direction.

[0016] By adopting the technical solution of this embodiment, multiple electrode welding sub-regions are arranged at intervals, so that there is a gap between two adjacent electrode welding sub-regions. The setting of this gap can provide accommodation space for the terminal welding area, reduce the risk of overlap between the electrode welding sub-regions and the terminal welding area, reduce the impact of welding the electrode terminal to the adapter on the electrode and the electrode welding sub-region, improve welding quality, and improve the connection reliability of the adapter, electrode, and electrode terminal. In addition, the simple arrangement of the electrode welding sub-regions is conducive to improving welding efficiency.

[0017] In some embodiments, multiple tab welding sub-regions are arranged in a ring around the circumference of the terminal welding area.

[0018] By adopting the technical solution of this embodiment, multiple tab welding sub-regions are arranged in a ring around 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-region is close, the current flow 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.

[0019] In some embodiments, two adjacent electrode welding sub-regions are arranged at intervals; or, two adjacent electrode welding sub-regions are connected.

[0020] By adopting the technical solution of this embodiment, multiple tab welding sub-regions can be flexibly set to meet the performance requirements of different battery cells.

[0021] 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 weld one-to-one with multiple tab welding sub-regions; or, the adapter is welded with multiple tabs of the same polarity, and the number of tab welding regions is multiple, and the multiple tabs of the same polarity are used to weld one-to-one with multiple tab welding regions.

[0022] 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.

[0023] In some embodiments, when multiple electrodes of the same polarity are welded to multiple electrode welding sub-regions in a one-to-one correspondence, at least one electrode covers at least a portion of the corresponding electrode welding sub-region; when multiple electrodes of the same polarity are welded to multiple electrode welding sub-regions in a one-to-one correspondence, at least one electrode covers at least a portion of the corresponding electrode welding sub-region.

[0024] By adopting the technical solution of this embodiment, the welding area of ​​the tab and the adapter can be flexibly set to meet the different battery cell usage requirements.

[0025] In some embodiments, the adapter is welded with multiple tabs of the same polarity, the multiple tabs of the same polarity are spaced apart, and a clearance gap is formed between two adjacent tabs. The clearance gap is disposed opposite to the terminal welding area.

[0026] By adopting the technical solution of this embodiment, the clearance gap is set opposite to the terminal welding area, so that the terminal welding area is staggered from the electrode tab, thereby reducing the damage to the electrode tab caused by welding the electrode terminal to the adapter, which is beneficial to improving the welding quality and improving the connection reliability of the adapter, electrode tab and electrode terminal.

[0027] In some embodiments, the adapter is welded with multiple tabs of the same polarity, and the multiple tabs of the same polarity overlap to form an overlap portion, which is used to weld to the tab welding area.

[0028] By adopting the technical solution of this embodiment, the overlapping part is formed by multiple electrode tabs overlapping each other. The thickness of the overlapping part is large, which is beneficial to improving the welding quality and connection reliability of the electrode tabs and the adapter.

[0029] In some embodiments, the edge of the tab away from the main body is used for welding to the tab welding sub-region.

[0030] By adopting the technical solution of this embodiment, the edge of the electrode tab away from the main body is welded to the electrode tab welding sub-area, so that the edge of the electrode tab away from the main body is fixed, reducing the risk of the edge of the electrode tab lifting and being damaged, and also helping to improve the reliability of the welding connection.

[0031] In some embodiments, a clearance through hole is provided at the position corresponding to the electrode tab and the terminal welding area for avoiding the terminal welding area.

[0032] By adopting the technical solution of this embodiment, the setting of the through hole can make the electrode tab avoid the terminal welding area, thereby reducing the damage to the electrode tab caused by welding the electrode terminal and the adapter, which is conducive to improving the welding quality and improving the connection reliability of the adapter, electrode tab and electrode terminal.

[0033] In some embodiments, the area of ​​the tab is S1, and the cross-sectional area of ​​the clearance through hole is S2, wherein 0.05≤S2 / S1≤0.25.

[0034] By adopting the technical solution of this embodiment, the design of 0.05≤S2 / S1≤0.25 can simultaneously ensure the welding reliability of the electrode tab and the adapter, and reduce the damage of the electrode tab during the welding process of the electrode terminal and the adapter, so that the electrode tab, the adapter and the electrode terminal can be stably connected together.

[0035] In some embodiments, 0.1 ≤ S2 / S1 ≤ 0.2.

[0036] By adopting the technical solution of this embodiment, the design of 0.05S1≤S2≤0.2S1 can better balance the welding reliability of the electrode tab and the adapter, and reduce the damage of the electrode tab during the welding process of the electrode terminal and the adapter, so that the electrode tab, the adapter and the electrode terminal can be connected together more stably.

[0037] In some embodiments, the cross-sectional area of ​​the bypass through-hole is S2, where 25mm 2 ≤S2≤125mm 2 .

[0038] By adopting the technical solution of this embodiment, 25mm 2 ≤S2≤125mm 2 The design ensures both the welding reliability of the tabs and the adapter, and reduces damage to the tabs during the welding process between the electrode terminals and the adapter, allowing the tabs, adapter, and electrode terminals to be stably connected together.

[0039] In some embodiments, 35mm 2 ≤S2≤65mm 2 .

[0040] By adopting the technical solution of this embodiment, 35mm 2 ≤S2≤65mm 2 The design can better balance the welding reliability of the electrode tab and the adapter, and reduce the damage to the electrode tab during the welding process of the electrode terminal and the adapter, so that the electrode tab, the adapter and the electrode terminal can be connected more stably.

[0041] In some embodiments, the distance between the avoidance through hole and the main body is L, and the distance between the edge of the electrode away from the main body and the main body is h, wherein 5mm≤L<h.

[0042] By adopting the technical solution of this embodiment, the design of 5mm≤L<h allows the avoidance through hole to be a certain distance from the main body, so as to facilitate the bending of the electrode tab, and the avoidance through hole and the terminal welding area are set opposite to each other to reduce the damage to the electrode tab.

[0043] In some embodiments, 8mm ≤ L ≤ 15mm.

[0044] By adopting the technical solution of this embodiment, the design of 8mm≤L<15mm can better balance the welding of the electrode tab and the adapter, as well as the welding of the electrode terminal and the adapter, which is beneficial to improving the connection reliability between the electrode tab, the adapter and the electrode terminal.

[0045] In some embodiments, the tab welding area is ultrasonically welded to the tab; and / or, the terminal welding area is laser welded to the electrode terminal.

[0046] 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.

[0047] In a second aspect, a battery is provided, comprising a battery cell as described in the above embodiments.

[0048] Thirdly, an electrical device is provided, including a battery as described in the above embodiments.

[0049] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0050] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0051] Figure 1 The diagram shows the structural features of a vehicle provided in some embodiments of this application.

[0052] Figure 2 This is an exploded structural diagram of a battery provided in some embodiments of this application.

[0053] Figure 3 The diagram shows the structure of a single battery cell provided in some embodiments of this application.

[0054] Figure 4 for Figure 3 The diagram shows the exploded structure of a single battery cell.

[0055] Figure 5 The diagram shows the structure of the end cap, adapter, and electrode assembly of a battery cell provided in other embodiments of this application.

[0056] Figure 6 for Figure 5 The diagram shows the welding of the electrode tabs and the adapter of the electrode assembly shown.

[0057] Figure 7 This is a schematic diagram of the welding of the tabs and adapters of the electrode assembly provided in some embodiments of this application.

[0058] Figure 8 This is a schematic diagram of the welding of the tabs and adapters of the electrode assembly provided in some embodiments of this application.

[0059] Figure 9 This is a schematic diagram of the welding of the tabs and adapters of the electrode assembly provided in some embodiments of this application.

[0060] Figure 10 This is a schematic diagram of the electrode assembly provided in some embodiments of this application before the tabs are bent.

[0061] The following are the labeling elements in the figure:

[0062] 1000, Vehicle; 1100, Battery; 1200, Controller; 1300, Motor; 100, Battery Cell; 10, Casing; 11, End Cap; 12, Housing; 20, Electrode Assembly; 21, Main Body; 22, Electrode Lug; 221, Clearance Gap; 222, Overlap; 223, Clearance Through Hole; 30, Adapter; 31, Electrode Lug Welding Area; 311, Electrode Lug Welding Sub-area; 32, Terminal Welding Area; 40, Electrode Terminal; 50, Pressure Relief Mechanism; 200, Housing; 210, First Part; 220, Second Part. Detailed Implementation

[0063] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0064] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0065] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0066] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least some of the embodiments of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments in any suitable manner.

[0067] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0068] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces). "Several" means one or more, unless otherwise explicitly specified.

[0069] In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0070] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0071] In the description of the embodiments of this application, unless otherwise expressly specified and limited, when an element is referred to as "fixed to" or "set on" another element, it may be directly on or indirectly on the other element. When an element is referred to as "connected to" another element, it may be directly connected to or indirectly connected to the other element.

[0072] The battery mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity. A battery generally includes a casing for encapsulating one or more battery cells. The casing can, to a certain extent, prevent liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0073] In a battery, when there are multiple battery cells, these cells can be connected in series, parallel, or a combination thereof. A combination thereof means that multiple battery cells are connected in both series and parallel configurations. Multiple battery cells can be directly connected in series, parallel, or a combination thereof, and then the entire assembly of these cells is housed within a casing. Alternatively, a battery can consist of multiple battery cells first connected in series, parallel, or a combination thereof to form a battery module, and then these modules are connected in series, parallel, or a combination thereof to form a whole, which is then housed within a casing. The battery may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells.

[0074] A battery cell typically includes a housing and an electrode assembly and an adapter disposed within the housing. The housing has 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 the electrical connection between the electrode terminals and the electrode assembly to facilitate the input and output of electrical energy to the battery cell.

[0075] In some cases, the adapter includes a terminal welding part and multiple tab welding parts. The multiple tab welding parts are spaced apart 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. However, the distance between the welding positions of the tab welding parts and the welding positions of the terminal welding parts and the electrode terminals is large, which leads to high ohmic resistance of the battery cell, poor overcurrent, and increased heat generation, which seriously affects the performance of the battery cell.

[0076] Based on this, this 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 electrical energy input or output 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 makes the welding position of the tab to the adapter and the welding position of the adapter to the electrode terminal closer, thereby reducing ohmic resistance, reducing overcurrent distance, reducing heat generation, and improving the performance of the battery cell.

[0077] The technical solutions described in the embodiments of this application are applicable to batteries and electrical devices that use batteries.

[0078] Batteries are widely used in various electronic devices, including mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools. A battery is a device that stores and releases electrical energy, providing the power needed by these electronic devices. Batteries can also be used as energy storage devices. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0079] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc.; electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc.; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical devices.

[0080] For ease of explanation, the following embodiments use a vehicle as an example of an electrical device from some embodiments of this application.

[0081] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, etc. A battery 1100 is disposed inside the vehicle 1000, and the battery 1100 can be located at the bottom, front, or rear of the vehicle 1000. The battery 1100 can be used to power the vehicle 1000; for example, the battery 1100 can serve as the 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 supply power to the motor 1300, for example, to meet the power needs of the vehicle 1000 during startup, navigation, and driving.

[0082] In some embodiments of this application, the battery 1100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0083] Please refer to Figure 2 , Figure 2This is a schematic diagram of the structure of a battery 1100 provided in some embodiments of this 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 provides a space for the battery cell 100, and the housing 200 can adopt various structures. In some embodiments, the housing 200 may include a first portion 210 and a second portion 220, which overlap each other, jointly defining a space for accommodating the battery cell 100. The second portion 220 may be a hollow structure with one open end, and the first portion 210 may be a plate-like structure, covering the open side of the second portion 220 so that the first portion 210 and the second portion 220 jointly define the space; alternatively, the first portion 210 and the second portion 220 may both be hollow structures with one open side, with the open side of the first portion 210 covering the open side of the second portion 220. Of course, the box 200 formed by the first part 210 and the second part 220 can be of various shapes, such as cylinder, cuboid, etc.

[0084] In battery 1100, there can be multiple battery cells 100. Multiple battery cells 100 can be connected in series, in parallel, or in a mixed manner. A mixed manner means that multiple battery cells 100 are connected in both series and parallel.

[0085] In some embodiments, multiple battery cells 100 can be directly connected in series, parallel, or in a hybrid configuration, and then the entire assembly of the multiple battery cells 100 is housed within the housing 200. Alternatively, the battery 1100 can also be composed of multiple battery cells 100 first connected in series, parallel, or in a hybrid configuration to form a battery module, and then these battery modules are connected in series, parallel, or in a hybrid configuration to form a whole, which is then housed within the housing 200. The battery 1100 may also include other structures; for example, the battery 1100 may also include a busbar component for realizing electrical connections between the multiple battery cells 100.

[0086] In some embodiments, the battery 1100 may not include the housing 200, but rather multiple battery cells 100 may be electrically connected and assembled into an electrical device after being formed into a whole by necessary fixing structures.

[0087] In this application, the battery cell 100 may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, lithium metal batteries, or magnesium-ion batteries, etc., and the embodiments of this application are not limited to these. The battery cell 100 may be cylindrical, flat, cuboid, or other shapes, etc., and the embodiments of this application are not limited to these. The battery cell 100 is generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells, and pouch battery cells, and the embodiments of this application are not limited to these.

[0088] Please refer to the following: Figures 3-6 As shown, Figure 3 This is a schematic diagram of the structure of a battery cell 100 provided in some embodiments of this application. Figure 4 for Figure 3 The diagram shows the exploded structure of the battery cell 100. Figure 5 This is a schematic diagram of the end cap 11, adapter 30, and electrode assembly 20 of a battery cell 100 provided in other embodiments of this application. Figure 6 for Figure 5 The diagram shows the welding of the tab 22 of the electrode assembly 20 to the adapter 30.

[0089] See Figure 3 and Figure 4 As shown, the battery cell 100 includes a housing 10 and an electrode assembly 20. The housing 10 refers to a shell structure 12 with internal space 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, so that the housing 10 is not easily deformed when subjected to compression or impact, enabling the battery cell 100 to have higher structural strength and improved reliability.

[0090] For example, the housing 10 includes an end cap 11 and a housing 12. The end cap 11 is a component that closes onto the opening of the housing 12 to isolate the internal environment of the battery cell 100 from the external environment. Indiscriminately, the shape of the end cap 11 can be adapted to the shape of the housing 12 to fit the housing 12. Optionally, the end cap 11 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 11 is less prone to deformation under pressure and impact, enabling the battery cell 100 to have higher structural strength and improved safety performance.

[0091] The housing 12 is a component used to cooperate with the end cap 11 to form the internal environment of the battery cell 100, wherein the formed internal environment can accommodate the electrode assembly 20, electrolyte, and adapter 30. The housing 12 and the end cap 11 can be independent components. An opening can be provided on the housing 12, and the end cap 11 closes the opening to form the internal environment of the battery cell 100. Alternatively, the end cap 11 and the housing 12 can be integrated. Specifically, the end cap 11 and the housing 12 can form a common connecting surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing 12, the end cap 11 closes the housing 12. The housing 12 can have various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 12 can be determined according to the specific shape and size of the electrode assembly 20. The material of the housing 12 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this embodiment does not impose any special limitations on this.

[0092] Electrode assembly 20 is the component in the battery cell 100 where electrochemical reactions occur. The housing 12 may contain one or more electrode assemblies 20. Electrode assembly 20 comprises a positive electrode, a negative electrode, and a separator. During the charging and discharging process of the battery cell 100, active ions (e.g., lithium ions) repeatedly insert and extract between the positive and negative electrode. The separator is disposed between the positive and negative electrode to prevent short circuits between the positive and negative electrodes while allowing active ions to pass through.

[0093] The positive electrode sheet includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The portion of the positive current collector not coated with the positive active material layer protrudes beyond the portion coated with the positive active material layer. This uncoated portion serves as the positive electrode tab. Alternatively, a metal conductor can be welded onto the positive current collector and led out to serve as the positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode sheet includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector. The portion of the negative current collector not coated with the negative active material layer protrudes beyond the portion coated with the negative active material layer. This uncoated portion serves as the negative electrode tab. Alternatively, a metal conductor can be welded onto the negative current collector and led out to serve as the negative electrode tab. The material of the negative current collector can be copper, and the negative active material can be carbon or silicon, etc. To ensure that a large current can pass through without melting, multiple positive electrode tabs and multiple negative electrode tabs are stacked together. Understandably, the electrode assembly 20 can have only one positive electrode tab and only one negative electrode tab. That is, the electrode assembly 20 has two sets of tabs, each set including at least one tab 22, with one set being the positive electrode tab and the other the negative electrode tab. The current collector portion of the electrode assembly 20 constitutes the main body 21 of the electrode assembly 20.

[0094] The electrode assembly 20 can be either a wound structure or a stacked structure. In a wound structure, the tabs 22 are typically welded to the current collector, and then arranged in the order of positive electrode plate—separator—negative electrode plate—separator; then wound to form a cylindrical or square cell. In a stacked structure, the tabs 22 are typically led out from the current collector, and the positive electrode plate, negative electrode plate, and separator are arranged in the order of positive electrode plate—separator—negative electrode plate—separator, stacked layer by layer to form a stacked cell; the separator can be cut and directly stacked as separator sheets, or the separator can be stacked in a Z-shaped fold without cutting it. The separator material can be PP (Polypropylene) or PE (Polyethylene), etc. The separator is an insulating film placed between the positive and negative electrodes. Its main functions are to isolate the positive and negative electrodes and prevent electrons in the battery from passing freely, thus preventing short circuits to a certain extent, while allowing ions in the electrolyte to pass freely between the positive and negative electrodes to form a circuit. The positive and negative electrodes are collectively referred to as electrodes.

[0095] Electrode terminals 40 are provided on the casing 10 of the battery cell 100. Electrode terminals 40 are conductive components located on the casing 10. They are connected to the tabs 22 of the electrode assembly 20 to output electrical energy from the battery cell 100 or to charge the battery cell 100. The battery cell 100 typically has two electrode terminals 40. These two terminals are 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, and the electrode terminal 40 connected to the negative tab is the negative electrode terminal.

[0096] For example, the two electrode terminals 40 can be disposed on the end cap 11, or respectively disposed on the housing 12 and the end cap 11, or disposed on different side walls of the housing 12.

[0097] A pressure relief mechanism 50 is provided on the casing 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, thereby improving the reliability of the battery 1100.

[0098] For example, the pressure relief mechanism 50 may be provided on the end cap 11 or on the housing 12.

[0099] See Figure 4 and Figure 5As shown, the battery cell 100 also includes an adapter 30, which is a conductive component located inside the housing 10. The adapter 30 is welded to the tab 22 and the electrode terminal 40 to achieve the 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 the output or input of electrical energy of the battery cell 100.

[0100] For ease of explanation, the positive and negative electrode tabs will be collectively referred to as electrode tab 22, the positive and negative electrode terminals will be collectively referred to as electrode terminals 40, and the positive and negative adapters will be collectively referred to as adapters 30. That is to say, electrode tab 22 can refer to either the positive or negative electrode tab. When electrode tab 22 refers to the positive electrode tab, electrode terminal 40 refers to the positive electrode terminal, and adapter 30 refers to the positive adapter. When electrode tab 22 refers to the negative electrode tab, electrode terminal 40 refers to the negative electrode terminal, and adapter 30 refers to the negative adapter.

[0101] See Figure 5 and Figure 6 As shown, in some embodiments of this application, a battery cell 100 is provided. The battery cell 100 includes a housing 10, an electrode assembly 20, and an adapter 30. The housing 10 is provided with electrode terminals 40 for outputting or inputting electrical energy. The electrode assembly 20 is located inside the housing 10 and includes a main body 21 and tabs 22 connected to the ends of the main body 21. The adapter 30 is located inside the housing 10 and is provided with a tab welding area 31 for welding to the tabs 22. The adapter 30 is also provided with a terminal welding area 32 for welding to the electrode terminals 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.

[0102] The tab welding area 31 can refer to the area of ​​the adapter 30 used for welding with 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 can be a weld, a weld point, a weld mark, or other structures.

[0103] The tab welding area 31 includes at least two tab welding sub-areas 311, each of which 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 a portion of the first welding structure in the area occupied by the adapter 30.

[0104] Terminal welding area 32 can refer to the area of ​​adapter 30 used for welding with electrode terminal 40. For example, after electrode terminal 40 is welded to adapter 30, a second welding structure is formed on adapter 30. The area occupied by the second welding structure on adapter 30 is called terminal welding area 32. The second welding structure can be a weld, solder joint, solder mark, or other structure.

[0105] For ease of illustration, see attached Figures 6-9 The electrode welding area 31 and electrode welding sub-area 311 are represented by dashed boxes, and the first welding structure and the second welding structure are represented by circles.

[0106] The terminal soldering area 32 is located between the two tab soldering sub-areas 311. It can be understood that tab soldering sub-areas 311 are provided on both sides of the terminal soldering area 32.

[0107] For example, there are two tab welding sub-regions 311, and the terminal welding area 32 is located between the two tab welding sub-regions 311.

[0108] In this embodiment of the battery cell 100, the tabs 22 of the electrode assembly 20 are welded to the tab welding area 31 of the adapter 30, and the electrodes of the housing 10 are welded to the terminal welding area 32 of the adapter 30. This enables the electrical connection between the tabs 22 and the electrode terminals 40, thereby enabling the battery cell 100 to input or output electrical energy. 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. This makes the welding positions of the tabs 22 and the adapter 30 and the adapter 30 and the electrode terminals 40 closer, reducing ohmic resistance, reducing overcurrent distance, reducing heat generation, and improving the performance of the battery cell 100.

[0109] In some embodiments, the adapter 30 has 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 aforementioned tab 22 welding portions spaced apart is changed to a quadrilateral adapter sheet structure.

[0110] In other embodiments of this 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.

[0111] Ultrasonic welding is a welding method that utilizes high-frequency vibration energy; it belongs to the field of power ultrasound. In ultrasonic welding, alternating current is first converted into a high-frequency signal, which is then transmitted to the workpiece via a transducer. Under the action of vibration, frictional heat is generated at the contact area of ​​the workpiece, causing the plastic or metal material to melt. Ultrasonic welding can be applied to welding thermoplastic products as well as metal welding.

[0112] Laser welding is a welding method that uses the thermal energy of a laser beam. During laser welding, the laser beam is focused onto the weld joint, and the high energy density of the laser beam rapidly heats the localized area of ​​the joint to a melting or fusion temperature. The welding materials melt rapidly under the irradiation of the laser beam, forming a weld. Laser welding can be applied to welding metals, plastics, and other materials.

[0113] In one possible implementation, the electrode welding area 31 and the electrode 22 are ultrasonically welded. It is understood that the electrode 22 is usually thin. The electrode welding area 31 and the electrode 22 are welded by ultrasonic welding. Ultrasonic welding causes little damage to the electrode 22, and the welding quality between the electrode 22 and the adapter 30 is good, resulting in good connection reliability.

[0114] In another possible implementation, the terminal welding area 32 is laser welded to the electrode terminal 40. It is understood that the terminal welding area 32 and the electrode terminal 40 are welded by laser welding, which results in high welding quality and good connection reliability.

[0115] In another possible implementation, 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.

[0116] By adopting the technical solution of this embodiment, it is beneficial to improve the connection reliability between the tab 22 and the electrode terminal 40, thereby improving the performance and reliability of the battery cell 100.

[0117] In other embodiments of this application, see [reference] Figure 5 and Figure 6 As shown, the terminal welding area 32 is spaced apart from the adjacent tab welding sub-area 311.

[0118] It is understandable that there is a gap between the terminal soldering area 32 and the adjacent tab soldering sub-area 311, that is, the terminal soldering area 32 and the adjacent tab soldering sub-area 311 do not overlap.

[0119] 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 welding the electrode terminal 40 and the adapter 30 on the tab 22 and the tab welding sub-area 311, which is conducive 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.

[0120] In some embodiments, the terminal welding area 32 may also partially overlap with the tab welding sub-area 311.

[0121] In other embodiments of this application, see [reference] Figure 5 and Figure 6 As shown, the distance between the terminal welding area 32 and the adjacent tab welding sub-area 311 is H, where 0mm≤H≤10mm.

[0122] The distance between the opposite edges of the terminal welding area 32 and the adjacent tab welding sub-area 311 is H.

[0123] 0mm≤H≤10mm means that H=0mm, the terminal welding area 32 and the adjacent tab welding sub-area 311 are close to each other at their edges; 0mm<H≤10mm means 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 reduce ohmic impedance, reduce overcurrent distance, reduce heat generation, and improve the performance of the battery cell 100.

[0124] 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 conducive to reducing ohmic impedance, reducing overcurrent distance, reducing heat generation, and improving the performance of the battery cell 100.

[0125] In other embodiments of this application, see [reference] Figure 5 and Figure 6 As shown, 5mm≤H≤8mm.

[0126] The formula 5mm≤H≤8mm can be understood as follows: 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 welding the electrode terminal 40 and the adapter 30 on the tab 22 and the tab welding sub-area 311, which is conducive 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; H≤8mm, the distance between the terminal welding area 32 and the tab welding sub-area 311 is smaller, which can better reduce ohmic resistance, reduce overcurrent distance, reduce heat generation, and improve the performance of the battery cell 100.

[0127] 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. This helps to reduce the impact of welding the electrode terminal 40 and the adapter 30 on the tab 22 and the tab welding sub-area 311, improves the welding quality, and improves the connection reliability of the adapter 30, tab 22 and electrode terminal 40. It also helps to reduce ohmic impedance, reduce overcurrent distance, reduce heat generation, and improve the performance of the battery cell 100.

[0128] In some embodiments, the value of H can be 0mm, 10mm, or 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, or 10mm.

[0129] Please refer to the following: Figures 7-9 As shown, Figure 7 A schematic diagram of the welding of the tab 22 of the electrode assembly 20 and the adapter 30 provided in some embodiments of this application. Figure 8 A schematic diagram of the welding of the tab 22 of the electrode assembly 20 and the adapter 30 provided in some embodiments of this application. Figure 9 A schematic diagram of the welding of the tab 22 of the electrode assembly 20 and the adapter 30 provided in some embodiments of this application.

[0130] In other embodiments of this application, see [reference] Figure 5 , Figure 6 and Figure 7 As shown, multiple electrode welding sub-regions 311 are arranged at intervals along the first direction.

[0131] It is understandable that multiple tab welding sub-regions 311 are arranged along the first direction, and there is a gap between two adjacent tab welding sub-regions 311.

[0132] For example, see Figure 5 and Figure 6 As shown, the electrode assembly 20 has a flat structure and has a length direction, a width direction, and a height direction. The length direction of the electrode assembly 20 can be found in [reference needed]. Figure 5 The Y-direction and the width direction of electrode assembly 20 can be found in the reference. Figure 5 The X-direction and the height direction of electrode assembly 20 can be referenced in the figure. 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.

[0133] See Figure 5As shown, the welding process between the tab 22 and the adapter 30 is as follows: The tab 22 extends from the upper end of the main body 21, and the adapter 30 is located above the main body 21. The upper part of the tab 22 is bent and covers the adapter 30, or the adapter 30 is covered by the upper part of the bent tab 22 before welding. Specifically, the adapter 30 has two tabs 22 welded to it. Before bending the tabs 22, the two tabs 22 are located on opposite sides of the adapter 30. Then, the upper parts of the two tabs 22 are bent relative to each other and covered by the adapter 30, or the adapter 30 is covered by the upper part of the bent tab 22 before welding the upper parts of the two tabs 22 to the adapter 30.

[0134] See Figure 5 and Figure 6 As shown, the first direction is the length direction of the electrode assembly 20, that is, the multiple tab welding sub-regions 311 are arranged at intervals along the length direction of the electrode assembly 20; or, refer to Figure 7 As shown, the first direction is the width direction of the electrode assembly 20. Multiple electrode tab welding sub-regions 311 can be arranged at intervals along the width direction of the electrode assembly 20. This arrangement facilitates welding operations and improves welding efficiency and quality. Of course, in other embodiments, the multiple electrode tab welding sub-regions 311 can also be arranged at intervals along other directions.

[0135] By adopting the technical solution of this embodiment, multiple tab welding sub-regions 311 are arranged at intervals, so that there is a gap between two adjacent tab welding sub-regions 311. The setting of this gap can provide accommodating space for the terminal welding area 32, and can also reduce the risk of overlap between the tab welding sub-regions 311 and the terminal welding area 32, reduce the impact of welding of the electrode terminal 40 and the adapter 30 on the tab 22 and the tab welding sub-regions 311, improve 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-regions 311 are arranged simply, which is conducive to improving welding efficiency.

[0136] In other embodiments of this application, see [reference] Figure 8 As shown, multiple tab welding sub-regions 311 are arranged in a ring along the circumference of the terminal welding region 32.

[0137] Understandably, multiple tab welding sub-regions 311 are arranged circumferentially along the terminal welding area 32 and surround the outer periphery of the terminal welding area 32. The number of tab welding sub-regions 311 can be, but is not limited to, three, four, or five. Multiple tab welding sub-regions 311 can be arranged to form polygonal structures such as triangles, quadrilaterals, and pentagons. Of course, multiple tab welding sub-regions 311 can also be arranged to form circular, elliptical, or other structures.

[0138] By adopting the technical solution of this embodiment, multiple tab welding sub-regions 311 are arranged in a ring around 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-regions 311 is close, the current transfer 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.

[0139] In other embodiments of this application, see [reference] Figure 8 As shown, two adjacent electrode welding sub-regions 311 are arranged at intervals; or, two adjacent electrode welding sub-regions 311 are connected.

[0140] It is understandable that there is a gap between the ends of two adjacent electrode welding sub-regions 311 that are close to each other, that is, multiple electrode welding sub-regions 311 are arranged to form a broken ring structure; the ends of two adjacent electrode welding sub-regions 311 that are close to each other are connected, that is, there is no gap between the ends of two adjacent electrode welding sub-regions 311 that are close to each other, that is, multiple electrode welding sub-regions 311 are arranged to form a closed ring structure.

[0141] For example, see Figure 8 As shown, there are four electrode welding sub-regions 311. The upper and lower electrode welding sub-regions 311 are located on the upper and lower sides of the terminal welding area 32, and the left and right electrode welding sub-regions 311 are located on the left and right sides of the terminal welding area 32. The four electrode welding sub-regions 311 are connected end to end in sequence to form a quadrilateral structure to surround the terminal welding area 32.

[0142] By adopting the technical solution of this embodiment, multiple tab welding sub-regions 311 can be flexibly set to meet the performance requirements of different battery cells 100.

[0143] In other embodiments of this application, see [reference] Figure 6 and Figure 7 As shown, 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 weld one-to-one with multiple tab welding sub-regions 311; or, the adapter 30 is welded with multiple tabs 22 of the same polarity, and the number of tab welding regions 31 is multiple, and the multiple tabs 22 of the same polarity are used to weld one-to-one with multiple tab welding regions 31.

[0144] Multiple electrodes with the same polarity 22 can refer to multiple positive electrodes or multiple negative electrodes.

[0145] The adapter 30 has multiple tabs 22 of the same polarity welded on it. It can be understood that when an electrode assembly 20 has multiple tabs 22 of the same polarity, these tabs 22 of the same polarity are all welded onto the adapter 30; when a battery cell 100 has multiple electrode assemblies 20, the tabs 22 of the multiple electrode assemblies 20 of the same polarity are welded onto the adapter 30.

[0146] For example, see Figure 5 and Figure 6 As shown, the battery cell 100 has two electrode assemblies 20, and the two electrode assemblies 20 have two tabs 22 with the same polarity. The two tabs 22 are welded to the same adapter 30, which facilitates the improvement of welding efficiency.

[0147] In one possible implementation, see [reference] Figure 7 and Figure 9 As shown, the adapter 30 is welded with multiple tabs 22 of the same polarity. These multiple tabs 22 are used to weld one-to-one with multiple tab welding sub-regions 311. It can be understood that the area where one tab 22 is welded to the adapter 30 is called the tab welding sub-region 311, and the entire area where multiple tabs 22 are welded to the adapter 30 is called the tab welding area 31. That is, the adapter 30 has one tab welding area 31, and one tab welding area 31 includes multiple tab welding sub-regions 311, which are welded one-to-one with multiple tabs 22 of the same polarity.

[0148] For example, see Figure 7 As shown, the adapter 30 has two tabs 22 with the same polarity welded on. The adapter 30 has a tab welding area 31, which includes two tab welding sub-areas 311. The two tab welding sub-areas 311 are arranged vertically and welded to the two tabs 22 arranged vertically and vertically respectively. The terminal welding area 32 is located between the two tab welding sub-areas 311.

[0149] In another possible implementation, see Figure 6 As shown, the adapter 30 is welded with multiple tabs 22 of the same polarity, and there are multiple tab welding areas 31. The multiple tabs 22 of the same polarity are used to weld one-to-one with the multiple tab welding areas 31. It can be understood that the area where one tab 22 is welded to the adapter 30 is called the 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 has multiple tab welding areas 31, and the multiple tab welding areas 31 are welded one-to-one with multiple tabs 22 of the same polarity. Each tab welding area 31 is provided with a terminal welding area 32. In other words, the electrode terminal 40 and the adapter 30 have multiple welding points, and the welding reliability between the electrode terminal 40 and the adapter 30 is good.

[0150] For example, see Figure 6 As shown, the adapter 30 has two tabs 22 of the same polarity welded on. The adapter 30 has two tab welding areas 31, which are arranged vertically. The two tab welding areas 31 are welded to the two tabs 22 arranged vertically. Each tab welding area 31 includes two tab welding sub-areas 311 arranged horizontally. A terminal welding area 32 is provided between the two tab welding sub-areas 311 arranged horizontally. That is, the adapter 30 and the electrode terminal 40 are welded to the two terminal welding areas 32 arranged vertically.

[0151] 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 needs of different battery cells 100.

[0152] In other embodiments of this application, see [reference] Figure 6 , Figure 7 and Figure 9 As shown, when multiple electrodes 22 of the same polarity are welded to multiple electrode welding sub-regions 311 in a one-to-one correspondence, at least one electrode 22 covers at least a portion of the corresponding electrode welding sub-region 311; when multiple electrodes 22 of the same polarity are welded to multiple electrode welding sub-regions 31 in a one-to-one correspondence, at least one electrode 22 covers at least a portion of the corresponding electrode welding sub-region 31.

[0153] "At least one electrode 22" can refer to one, two, or three electrodes 22; it can refer to a portion of electrodes 22 or all electrodes 22.

[0154] "At least a portion of the tab welding sub-region 311" can refer to a part of the tab welding sub-region 311 or the entire tab welding sub-region 311.

[0155] "At least a portion of the tab welding area 31" can refer to a part of the tab welding area 31 or the entire tab welding area 31.

[0156] In one possible implementation, when multiple tabs 22 of the same polarity are welded one-to-one with multiple tab welding sub-regions 311, 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 part of the tab welding sub-region 311 to which it is welded, or it may cover the entire area of ​​the tab welding sub-region 311 to which it is welded. Wherein, if 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 beneficial to improving the reliability and performance of the battery cell 100.

[0157] For example, see Figure 7 As shown, the upper and lower tabs 22 completely cover the upper and lower tab welding sub-areas 311, respectively, and the connection between the tabs 22 and the adapter 30 is reliable.

[0158] For example, see Figure 9 As shown, the upper tab 22 covers the lower part of the upper tab welding sub-region 311, and the lower tab 22 covers the upper part of the lower tab welding sub-region 311.

[0159] In another possible implementation, 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 part of the tab welding area 31 to which it is welded, or it may cover the entire area of ​​the tab welding area 31 to which it is welded. Wherein, if 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 beneficial to improving the reliability and performance of the battery cell 100.

[0160] For example, see Figure 6 As shown, the upper and lower tabs 22 completely cover the upper and lower tab welding areas 31, respectively, and the connection between the tabs 22 and the adapter 30 has good reliability.

[0161] 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 the usage requirements of different battery cells 100.

[0162] In other embodiments of this application, see [reference] Figure 7 As shown, 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 a clearance gap 221 is formed between two adjacent tabs 22. The clearance gap 221 is arranged opposite to the terminal welding area 32.

[0163] The clearance 221 can refer to the gap between two adjacent tabs 22.

[0164] For example, see Figure 7 As shown, the gap formed between the opposing edges of the upper and lower tabs 22 is the clearance gap 221.

[0165] By adopting the technical solution of this embodiment, the clearance gap 221 is set opposite to the terminal welding area 32, so that the terminal welding area 32 is staggered from the electrode tab 22, thereby reducing the damage to the electrode tab 22 caused by welding 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 electrode tab 22 and the electrode terminal 40.

[0166] In particular, when the electrode terminal 40 and the adapter 30 are laser welded, direct laser irradiation on the tab 22 will cause damage to the tab 22; while the clearance gap 221 allows the laser to pass through, thereby irradiating the tab 22 and reducing the risk of damage to the tab 22.

[0167] In other embodiments of this application, see [reference] Figure 8 As shown, the adapter 30 is welded with multiple tabs 22 of the same polarity. The multiple tabs 22 of the same polarity overlap to form an overlap portion 222, which is used to weld with the tab welding area 31.

[0168] It is understandable that after multiple tabs 22 are bent, the overlapping parts of the multiple tabs 22 form an overlap 222.

[0169] For example, see Figure 8 As shown, the two tabs 22 arranged vertically are stacked to form an overlap portion 222. The overlap portion 222 is welded to the adapter 30 to form a quadrilateral tab welding area 31. The terminal welding area 32 is located inside the tab welding area 31.

[0170] By adopting the technical solution of this embodiment, the overlapping part 222 is formed by overlapping multiple tabs 22. The overlapping part 222 has a large thickness, which is beneficial to improving the welding quality and connection reliability of the tabs 22 and the adapter 30.

[0171] In other embodiments of this application, see [reference] Figure 9 As shown, the edge of the tab 22 away from the main body 21 is used for welding with the tab welding sub-region 311.

[0172] 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 side is the side of the main body 21 away from the main body 21.

[0173] For example, see Figure 9As shown, the electrode welding sub-region 311 includes two electrode welding sub-regions 311 arranged vertically. The upper part of the lower electrode 22 is welded to the upper electrode welding sub-region 311, and the lower part of the upper electrode 22 is welded to the lower electrode welding sub-region 311. The two electrodes 22 overlap to form an overlap portion 222, that is, the upper part of the overlap portion 222 is welded to the upper electrode welding sub-region 311, and the lower part of the overlap portion 222 is welded to the lower electrode welding sub-region 311.

[0174] 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 lifting and being damaged, and also helping to improve the reliability of the welding connection.

[0175] In other embodiments of this application, see [reference] Figure 9 As shown, the electrode tab 22 is provided with a clearance through hole 223 at the position corresponding to the terminal welding area 32 for avoiding the terminal welding area 32.

[0176] The clearance through-hole 223 can refer to a through-hole that passes through the tab 22. The clearance through-hole 223 is arranged opposite to the terminal soldering area 32, so that the terminal soldering area 32 and the tab 22 are staggered. The shape of the clearance through-hole 223 can be various, such as: circular, polygonal, elliptical, etc.

[0177] For example, see Figure 6 As shown, both the upper and lower tabs 22 are provided with clearance through holes 223. The two clearance through holes 223 are respectively positioned opposite to the middle of the welding areas 31 of the two upper and lower tabs, so that the tabs 22 can 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 respectively, thereby welding the tabs 22 onto the adapter 30. Then, laser welding is performed in the area of ​​the clearance through holes 223, thereby welding the adapter 30 and the electrode terminal 40 together.

[0178] For example, see Figure 8 As shown, a clearance through-hole 223 is provided in the middle of the overlap area. The clearance through-hole 223 is positioned opposite to the hollow hole formed by the quadrilateral electrode welding area 31, so that the electrode 22 can avoid the terminal welding area 32. With the terminal welding area 32 located within the electrode welding area 31, during welding, the clearance through-holes 223 of the two electrodes 22 are overlapped. Then, ultrasonic welding is performed around the overlapped clearance through-holes 223 to weld the overlap area onto the adapter 30. Next, laser welding is performed in the area of ​​the clearance through-hole 223 to weld the adapter 30 and the electrode terminal 40.

[0179] For example, see Figure 9As shown, a clearance through-hole 223 is provided in the middle of the overlapping area. The clearance through-hole 223 is located between the upper and lower electrode welding sub-areas 311, allowing the electrode 22 to avoid the terminal welding area 32. During welding, the clearance through-holes 223 of the two electrode 22s are overlapped. Then, ultrasonic welding is performed on the opposite sides of the clearance through-holes 223 to weld the overlapping area to the adapter 30. Next, laser welding is performed in the area of ​​the clearance through-holes 223 to weld the adapter 30 and the electrode terminal 40. This welding method can use two ultrasonic welding operations, reducing the number of welding operations and improving the production efficiency of the battery cell 100.

[0180] By adopting the technical solution of this embodiment, the setting of the through hole 223 can make the tab 22 avoid the terminal welding area 32, thereby reducing the damage to the tab 22 caused by welding 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.

[0181] In particular, when the electrode terminal 40 and the adapter 30 are laser welded, direct laser irradiation on the tab 22 will cause damage to the tab 22; while the clearance through hole 223 allows the laser to pass through, thereby irradiating the tab 22 and reducing the risk of damage to the tab 22.

[0182] Please refer to the following: Figure 10 As shown, Figure 10 This is a schematic diagram of the electrode assembly 20 provided in some embodiments of this application before the tab 22 is bent.

[0183] In other embodiments of this application, see [reference] Figure 10 As shown, the area of ​​the tab 22 is S1, and the cross-sectional area of ​​the clearance through hole 223 is S2, where 0.05≤S2 / S1≤0.25.

[0184] The area S1 of the tab 22 can refer to the area of ​​the side surface of the tab 22 along the thickness direction.

[0185] For example, the area of ​​the side of the tab 22 near the outside of the electrode assembly 20 can 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 can also refer to the area S1 of the tab 22.

[0186] The cross-sectional area S2 of the bypass through hole 223 can refer to the area enclosed by the figure obtained by using a plane perpendicular to the axis of the bypass through hole 223.

[0187] For example, the area of ​​the opening formed on the surface of the tab 22 by the avoidance through hole 223 can refer to the cross-sectional area S2 of the avoidance through hole 223.

[0188] 0.05≤S2 / S1≤0.25, that is, 0.05≤S2 / S1≤0.25, can be understood as S2≥0.05S1, so that the through hole 223 has a certain area, allowing the welding head of the welding electrode terminal 40 and the adapter 30 to pass through, so as to reduce the damage of the electrode tab 22 during the welding process of the electrode terminal 40 and the adapter 30; S2≤0.25S1, so that the electrode tab 22 has a certain area to weld with the adapter 30, thereby improving the reliability of the welding.

[0189] By adopting the technical solution of this embodiment, the design of 0.05≤S2 / S1≤0.25 can simultaneously ensure 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.

[0190] In other embodiments of this application, see [reference] Figure 10 As shown, 0.1≤S2 / S1≤0.2.

[0191] The formula 0.1S1≤S2≤0.2S1, or 0.1≤S2 / S1≤0.2, can be understood as follows: S2≥0.1S1, the bypass through hole 223 has a larger area, which allows the welding head of the welding electrode terminal 40 and the adapter 30 to pass through better, so as to better reduce the damage of the electrode tab 22 during the welding process of the electrode terminal 40 and the adapter 30; S2≤0.2S1, so that the electrode tab 22 has a larger area to weld with the adapter 30, thereby improving the reliability of the welding.

[0192] By adopting the technical solution of this embodiment, the design of 0.05S1≤S2≤0.2S1 can better balance 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.

[0193] In some embodiments, the value of S2 / S1 can be 0.05, 0.25, or 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, or 0.25.

[0194] In other embodiments of this application, see [reference] Figure 10 As shown, the cross-sectional area of ​​the clearance through hole 223 is S2, where 25mm 2 ≤S2≤125mm2 .

[0195] 25mm 2 ≤S2≤125mm 2 It is understandable that S2 ≥ 25mm 2 The through hole 223 has a certain area, allowing the welding heads of the welding electrode terminal 40 and the adapter 30 to pass through, thereby reducing damage to the tab 22 during the welding process between the electrode terminal 40 and the adapter 30; S2≤125mm 2 This allows the tab 22 to have a certain area for welding with the adapter 30, thereby improving the reliability of the welding.

[0196] By adopting the technical solution of this embodiment, 25mm 2 ≤S2≤125mm 2 The design can simultaneously ensure the welding reliability of the tab 22 and the adapter 30, and reduce the damage to the tab 22 during the welding process between 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.

[0197] In other embodiments of this application, see [reference] Figure 10 As shown, 35mm 2 ≤S2≤65mm 2 .

[0198] 35mm 2 ≤S2≤65mm 2 It is understandable that S2 ≥ 35mm 2 The avoidance through hole 223 has a larger area, which allows the welding heads of the welding electrode terminal 40 and the adapter 30 to pass through more easily, thereby reducing the damage to the tab 22 during the welding process between the electrode terminal 40 and the adapter 30; S2≤65mm 2 This allows the tab 22 to have a larger area for welding with the adapter 30, thereby improving the reliability of the welding.

[0199] By adopting the technical solution of this embodiment, 35mm 2 ≤S2≤65mm 2 The design can better balance the welding reliability of the tab 22 and the adapter 30, and reduce the damage to 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.

[0200] In some embodiments, the value of S2 can be 25mm. 2 125mm 2 and located at 25mm 2 and 125mm 2Any number between these values; for example, the value of S2 can be, but is 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 .

[0201] In other embodiments of this application, see [reference] Figure 10 As shown, the distance between the clearance 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, where 5mm≤L<h.

[0202] The distance L between the clearance through hole 223 and the main body 21 can refer to the distance between the end face of the main body 21 and the edge of the clearance through hole 223 near the main body.

[0203] The distance h between the edge of the tab 22 away from the main body 21 and the main body 21 can refer to the protrusion height of the tab 22 protruding from the current collector.

[0204] 5mm≤L<h means that L≥5mm, which allows for a certain distance between the clearance channel and the main body 21, providing space for the subsequent bending of the tab 22, and facilitating the relative placement of the clearance through hole 223 and the terminal welding area 32 to reduce damage to the tab 22. At the same time, it also prevents the clearance through hole 223 from being placed on the main body 21, thus improving the charging and discharging performance of the battery cell 100. L<h means that the clearance through hole 223 is located on the tab 22 to achieve clearance.

[0205] By adopting the technical solution of this embodiment, the design of 5mm≤L<h allows the bypass through hole 223 to be a certain distance from the main body 21, so as to facilitate the bending of the electrode tab 22, and the bypass through hole 223 and the terminal welding area 32 are arranged opposite to each other, so as to reduce the damage to the electrode tab 22.

[0206] In other embodiments of this application, see [reference] Figure 10 As shown, 8mm≤L≤15mm.

[0207] The range of 8mm ≤ L < 15mm can be understood as follows: L ≥ 8mm allows for a larger distance between the clearance channel and the main body 21, which can better reserve space for the subsequent bending of the electrode 22 and facilitate the relative arrangement of the clearance through hole 223 and the terminal welding area 32, thereby reducing damage to the electrode 22; L < 15mm also allows for a certain distance between the clearance through hole 223 and the edge of the electrode 22 away from the main body 21, which can facilitate increasing the welding area between the electrode 22 and the adapter 30, and also helps to improve the structural strength of the electrode 22 and the reliability of the welding between the electrode 22 and the adapter 30.

[0208] By adopting the technical solution of this embodiment, the design of 8mm≤L<15mm can better balance the welding of the tab 22 and the adapter 30 as well as 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.

[0209] In some embodiments, the value of L can be 5mm, h, or 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, or 17mm.

[0210] The present application will be described below with reference to some embodiments.

[0211] Example 1

[0212] In this embodiment, refer to Figure 5 , Figure 6 and Figure 10 As shown, the battery cell 100 includes a housing 10, an electrode assembly 20, and an adapter 30: the housing 10 is provided with electrode terminals 40 for outputting or inputting electrical energy; the electrode assembly 20 is located inside the housing 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 inside the housing 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 terminals 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.

[0213] In this embodiment, the outer casing 10 includes a housing 12 and an end cap 11. The end cap 11 covers the opening of the housing 12, and the electrode terminal 40 is disposed on the end cap 11.

[0214] In this embodiment, the tab welding area 31 is ultrasonically welded to the tab 22; the terminal welding area 32 is laser welded to the electrode terminal 40.

[0215] In this embodiment, the terminal welding area 32 is spaced apart from the adjacent tab welding sub-area 311.

[0216] In this embodiment, the distance between the terminal welding area 32 and the adjacent tab welding sub-area 311 is H, where 0mm≤H≤10mm.

[0217] In this embodiment, 5mm ≤ H ≤ 8mm.

[0218] In this embodiment, multiple electrode welding sub-regions 311 are arranged at intervals along a first direction. The first direction is the length direction of the electrode assembly 20.

[0219] In this embodiment, the adapter 30 is welded with multiple tabs 22 of the same polarity, and there are multiple tab welding areas 31. The multiple tabs 22 of the same polarity are used to weld one-to-one with the multiple tab welding areas 31.

[0220] In this 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.

[0221] In this embodiment, the position of the tab 22 corresponding to the terminal welding area 32 is provided with a clearance through hole 223 for avoiding the terminal welding area 32.

[0222] In this embodiment, the area of ​​the tab 22 is S1, and the cross-sectional area of ​​the clearance through hole 223 is S2, wherein 0.05≤S2 / S1≤0.25.

[0223] In this embodiment, 0.1 ≤ S2 / S1 ≤ 0.2.

[0224] In this embodiment, the cross-sectional area of ​​the bypass through hole 223 is S2, where 25mm2≤S2≤125mm2.

[0225] In this embodiment, 35mm² ≤ S² ≤ 65mm².

[0226] 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 5mm≤L<h.

[0227] In this embodiment, 8mm ≤ L ≤ 15mm.

[0228] Example 2

[0229] The difference between this embodiment and Embodiment 1 is as follows: (See attached...) Figure 7 As shown, the adapter 30 is welded with multiple tabs 22 of the same polarity, which are used to weld to the multiple tab welding sub-regions 311 one by one.

[0230] In this embodiment, multiple tab welding sub-regions 311 are arranged at intervals along a first direction. The first direction is the width direction of the electrode assembly 20.

[0231] In this 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.

[0232] In this embodiment, the adapter 30 is welded with a plurality of tabs 22 of the same polarity. The plurality of tabs 22 of the same polarity are spaced apart, and a clearance gap 221 is formed between two adjacent tabs 22. The clearance gap 221 is disposed opposite to the terminal welding area 32.

[0233] Example 3

[0234] The difference between this embodiment and Embodiment 2 is as follows: (See attached...) Figure 8 As shown, the adapter 30 is welded with multiple tabs 22 of the same polarity. The multiple tabs 22 of the same polarity overlap to form an overlap portion 222, which is used to weld with the tab welding area 31.

[0235] In this embodiment, multiple tab welding sub-regions 311 are arranged in a ring along the circumference of the terminal welding region 32.

[0236] In this embodiment, two adjacent electrode welding sub-regions 311 are connected.

[0237] Example 4

[0238] The difference between this embodiment and Embodiment 3 is as follows: (See attached...) Figure 8 As shown, multiple electrode welding sub-regions 311 are arranged at intervals along the first direction.

[0239] In this embodiment, the edge of the tab 22 away from the main body 21 is used for welding with the tab welding sub-region 311.

[0240] In other embodiments of this application, a battery 1100 is provided, including a battery cell 100 as described in the above embodiments.

[0241] In other embodiments of this application, an electrical device is provided, including the battery 1100 as described in the above embodiments.

[0242] The description of the various embodiments above tends to emphasize the differences between the various embodiments. The similarities or similarities between them can be referred to, and for the sake of brevity, they will not be repeated here.

[0243] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, include: The housing is equipped with electrode terminals for outputting or inputting electrical energy; An electrode assembly, located within the housing, includes a main body and tabs connected to an end of the main body; An adapter is located inside the housing. The adapter has a tab welding area for welding with the tab, and the adapter also has a terminal welding area for welding with the electrode terminal. The electrode welding area includes at least two electrode welding sub-areas, and the terminal welding area is located between the two electrode welding sub-areas; The electrode tab is provided with a clearance through hole at the position corresponding to the terminal welding area for avoiding the terminal welding area.

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

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

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

5. The battery cell according to any one of claims 1 to 4, characterized in that: The multiple electrode welding sub-regions are arranged at intervals along the first direction.

6. The battery cell according to any one of claims 1 to 4, characterized in that: Multiple electrode welding sub-regions are arranged in a ring along the circumference of the terminal welding area.

7. The battery cell according to claim 5, characterized in that: The adjacent electrode welding sub-regions are arranged at intervals; or, the adjacent electrode welding sub-regions are connected.

8. The battery cell according to any one of claims 1 to 4, characterized in that: The adapter is welded with multiple tabs of the same polarity, and the multiple tabs of the same polarity are used to weld one-to-one with the welding sub-regions of the multiple tabs; Alternatively, the adapter may be welded with multiple tabs of the same polarity, and the number of tab welding areas may be multiple, with the multiple tabs of the same polarity used to weld one-to-one with the multiple tab welding areas.

9. The battery cell according to claim 8, characterized in that: In the case where multiple electrodes of the same polarity are welded to multiple electrode welding sub-regions in a one-to-one correspondence, at least one electrode covers at least a portion of the corresponding electrode welding sub-region. In the case where multiple electrodes of the same polarity are welded to multiple electrode welding areas in a one-to-one correspondence, at least one electrode covers at least a portion of the corresponding electrode welding area.

10. The battery cell according to any one of claims 1 to 4, characterized in that: The adapter is welded with multiple electrodes of the same polarity. The electrodes of the same polarity are spaced apart, and a clearance gap is formed between two adjacent electrodes. The clearance gap is positioned opposite to the terminal welding area.

11. The battery cell according to any one of claims 1 to 4, characterized in that: The adapter is welded with multiple electrodes of the same polarity. The multiple electrodes of the same polarity overlap to form an overlap portion, which is used to weld to the electrode welding area.

12. The battery cell according to claim 11, characterized in that: The edge of the electrode tab away from the main body is used for welding to the electrode tab welding sub-area.

13. The battery cell according to any one of claims 1 to 4, characterized in that: The area of ​​the electrode tab is S1, and the cross-sectional area of ​​the clearance through hole is S2, wherein 0.05≤S2 / S1≤0.

25.

14. The battery cell according to claim 13, characterized in that: 0.1≤S2 / S1≤0.

2.

15. The battery cell according to any one of claims 1 to 4, characterized in that: The cross-sectional area of ​​the clearance through hole is S2, where 25mm 2 ≤S2≤125mm 2 .

16. The battery cell according to claim 15, characterized in that: 35mm 2 ≤S2≤65mm 2 。 17. The battery cell according to any one of claims 1 to 4, characterized in that: The distance between the clearance through hole and the main body is L, and the distance between the edge of the electrode away from the main body and the main body is h, where 5mm≤L<h.

18. The battery cell according to claim 17, characterized in that: 8mm≤L≤15mm.

19. The battery cell according to any one of claims 1 to 4, characterized in that: The electrode welding area is ultrasonically welded to the electrode; and / or, the terminal welding area is laser welded to the electrode terminal.

20. A battery, characterized in that: Includes the battery cell according to any one of claims 1 to 19.

21. An electrical device, characterized in that: Includes the battery as described in claim 20.

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