Battery cell and electrical device

Abstract

Battery cell, comprising: a housing having a first wall; an electrode terminal arranged on the first wall; an electrode assembly disposed in the housing; an electrode tab extending from one end of the electrode assembly and electrically connected to the electrode terminal and disposed in the housing, the electrode tab having a first end and a second end, the first end connected to the electrode assembly; a metal plate, wherein the second end is arranged between the metal plate and the electrode terminal, and the metal plate, the second end and the electrode terminal are fixed to each other by welding, wherein the metal plate comprises a main body portion and a protruding portion, the protruding portion protrudes toward the electrode terminal relative to the main body portion, the protruding portion comprises a bottom wall and a peripheral wall, the peripheral wall surrounds an outer periphery of the bottom wall and connects the bottom wall and the main body portion, a welding point is provided on the bottom wall, a minimum distance between the welding point and the outer circumference of the bottom wall is represented by D, a hardness of the metal plate is represented by A, a thickness of the electrode tab is represented by W and the following applies: 0.0015 mm 2 / HB≤D*W / A≤0.3 mm 2 / HB.

Description

Technical area

[0001] The present application relates to the field of battery technology, in particular to a battery cell and an electrical device. background

[0002] With the development and maturation of battery technology, applications for battery technology have become increasingly widespread, such as in electric vehicles, small electric drones, and other electrical devices. Battery technology is a crucial factor in the development of electrical devices. However, during the welding process of electrode tabs and terminals, protrusions easily occur on the electrode tab, leading to the electrode tab tearing, which reduces the reliability of battery manufacturing. Brief description

[0003] The present application provides a battery cell and an electrical device that solve the technical problem of tearing of an electrode tab during welding for a battery, thereby achieving the technical effect of improving reliability for the battery during manufacturing.

[0004] To achieve the above-mentioned objectives, the main technical solutions applied in the present application include the following: According to a first aspect, an embodiment of the present application provides a battery cell comprising a housing, an electrode terminal, an electrode assembly, an electrode tab, and a metal plate. The housing has a first wall, the electrode terminal is arranged on the first wall, the electrode assembly is arranged in the housing, and the electrode tab is arranged in the housing. The electrode tab has a first end and a second end, the first end being connected to the electrode assembly and the second end being arranged between the metal plate and the electrode terminal. The metal plate, the second end, and the electrode terminal are fixed to each other by welding. The metal plate includes a main body portion and a protruding portion, the protruding portion protruding toward the electrode terminal relative to the main body portion.The protruding portion includes a bottom wall and a peripheral wall, the peripheral wall surrounding an outer periphery of the bottom wall and connecting the bottom wall and the main body portion. A weld is provided on the bottom wall, a minimum distance between the weld and the outer periphery of the bottom wall being represented by D, a hardness of the metal plate being represented by A, and a thickness of the electrode tab being represented by W, where: 0.0015 mm. 2 / HB≤D*W / A≤0.3 mm 2 / HB.

[0005] For the battery cell of this embodiment, the minimum distance D between the welding point and the outer circumference of the bottom wall, the hardness A of the metal plate and the thickness W of the electrode tab are: 0.0015 mm 2 / HB≤D*W / A≤0.3 mm 2 / HB, which effectively reduces the probability of electrode tab tearing while maintaining good battery cell performance (good current flow between electrode tab and electrode terminal), improving the stability of the connection between electrode tab and electrode terminal, and improving the quality of the manufactured battery cell.

[0006] In a second aspect, an embodiment of the present application provides an electrical device comprising any of the battery cells described in the embodiments of the present application.

[0007] In the electrical device of this embodiment, the minimum distance D between the welding point and the outer circumference of the bottom wall, the hardness A of the metal plate and the thickness W of the electrode tab: 0.0015 mm 2 / HB≤D*W / A≤0.3 mm 2 / HB, which effectively reduces the probability of electrode tab tearing while maintaining good battery cell performance (good current flow between electrode tab and electrode terminal), improving the stability of the connection between electrode tab and electrode terminal, and improving the quality of the manufactured battery cell. Brief description of the drawings

[0008] To better illustrate the technical solutions in the specific embodiments or prior art of the present application, a brief introduction to the drawings necessary for describing the specific embodiments or prior art is provided below. It is understood that the drawings described below represent some embodiments of the present application, and that a person skilled in the art can create other drawings based on these drawings without any creative effort. Fig. 1 is an exploded structural diagram of a battery cell according to an embodiment of the present application; Fig. 2 shows a positional relationship between a metal plate, an electrode terminal, and an electrode tab according to an embodiment of the present application; Fig. 3 shows structures of a weld and a metal plate according to an embodiment of the present application; Fig. 4 shows a positional relationship between a metal plate, an electrode terminal, and an electrode tab according to an embodiment of the present application. [Description of reference symbols]

[0009] Battery cell 100A; housing 110; first wall 111; electrode terminal 120; electrode assembly 130; electrode tab 140; first end 141; second end 142; metal plate 150; main body portion 151; protruding portion 152; bottom wall 152A; peripheral wall 152B; weld 160; first weld 161; second weld 162; center region 170; peripheral region 180; first main body portion 210; second main body portion 220; first plate 221; second plate 222; transition member 230; first annular groove 240. DETAILED DESCRIPTION

[0010] To clarify the purpose, technical solutions, and advantages of the embodiments of the present disclosure, the technical solutions in the embodiments of the present disclosure are described clearly and completely in conjunction with the accompanying drawings. The described embodiments are, of course, only a portion of the embodiments of the present application and not all. All other embodiments obtained by those skilled in the art without creative effort based on these embodiments are intended to fall within the scope of the present application.

[0011] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by one of ordinary skill in the art to which this application pertains. The terms used in the description of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "include," "comprising," and "having," and any variations thereof, used in the description, claims, and foregoing drawings of this application, are intended to cover non-exclusive inclusion. The terms "first," "second," etc.in the specification, claims, or the above brief description of the drawings of the present application are used to distinguish different objects rather than to describe a specific order or primary-secondary relationship.

[0012] References to "embodiments" in this application mean that specific features, structures, or characteristics described in connection with the embodiments may be included in at least one embodiment of this application. The appearance of this term in various places throughout the specification does not necessarily refer to the same embodiment, nor does it exclude independent or alternative embodiments. One skilled in the art will explicitly and implicitly understand that the embodiments described in this application may be combined with other embodiments.

[0013] In the description of the present application, it should be noted that the terms "built-in," "connected," "coupled," and "attached" are to be understood broadly unless expressly stated and limited otherwise. These terms may, for example, mean a fixed connection, a detachable connection, or an integral connection; a direct connection or an indirect connection through intermediate media; or a communication between the interiors of two elements. A person skilled in the art can understand the specific meanings of these terms in the present application according to the respective situations.

[0014] The term "and / or" in the present application is merely a description of an association relationship between associated objects, indicating that three relationships can exist. For example, "A and / or B" can indicate: A is present alone, A and B are present, or B is present alone. Additionally, the character " / " in the present application generally indicates an "or" relationship between the associated objects before and after the term.

[0015] The term "a plurality of" as used in this application refers to two or more (including two). Similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0016] In some embodiments, the battery may be a battery module. If a plurality of battery cells are present, the plurality of battery cells are arranged and fixed to form a battery module.

[0017] In some embodiments, the battery may be a battery pack. The battery pack includes a battery box and battery cells. The battery cells or battery module are contained in the battery box.

[0018] In some embodiments, the battery cell may be a secondary battery, i.e., a battery cell that can be recharged after discharge to reactivate its active materials and restore its usability. The battery cell may be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-hydride battery, a nickel-cadmium battery, a lead-acid battery, etc. The embodiments of the present application are not limited thereto.

[0019] With the development and maturation of battery technology, applications of battery technology have become increasingly widespread, such as in electric vehicles, small electric drones, and other electrical devices. Battery technology is a crucial factor in the development of electrical devices. The quality of the produced and manufactured battery is closely linked to the service life and quality of the electrical device, so ensuring the quality of the produced and manufactured battery is crucial.

[0020] The battery includes electrode tabs and terminals. The electrode tab is a key part of the battery and extends from the battery cell to carry the positive and negative electrodes. As a metal conductor, the electrode tab acts as a contact during charging and discharging of the battery. The terminals (electrode leads) are the two interfaces of the battery, with one of the terminals serving as the positive pole and the other of the terminals serving as the negative pole, which are the pole positions that connect the battery to external circuits. The electrode tab and terminal (electrode lead) are typically joined by welding to create an electrical connection, allowing energy to flow from the battery cell to the outside.

[0021] However, in the prior art, during the welding process of electrode tabs and terminals, protrusions easily occur on the electrode tab, which leads to tearing of the electrode tab, which reduces the reliability of the battery during manufacturing.

[0022] To solve the technical problem of electrode tab tearing during the welding process between electrode tabs and terminals and to improve the reliability of battery manufacturing, some embodiments of the present application provide a battery cell and an electrical device. The battery cell includes a housing, an electrode terminal, an electrode assembly, an electrode tab, and a metal plate.

[0023] The housing has a first wall, with the electrode terminal disposed on the first wall. The electrode assembly is disposed in the housing, and the electrode tab is disposed in the housing. The electrode tab has a first end and a second end. The first end is connected to the electrode assembly, and the second end is disposed between the metal plate and the electrode terminal. The metal plate, the second end, and the electrode terminal are fixed to each other by welding. The metal plate includes a main body portion and a protruding portion. The protruding portion protrudes toward the electrode terminal relative to the main body portion. The protruding portion includes a bottom wall and a peripheral wall. The peripheral wall surrounds the outer periphery of the bottom wall and connects the bottom wall and the main body portion. A weld is provided on the bottom wall.A minimum distance between the welding point and the outer periphery of the bottom wall is represented by D, a hardness of the metal plate is represented by A, and a thickness of the electrode tab is represented by W, where: 0.0015 mm. 2 / HB≤D*W / A≤0.3 mm 2 / HB.

[0024] In the above solution, the second end, which is arranged between the metal plate and the electrode terminal, can provide a buffer for welding between the electrode terminal and the electrode tab, thereby reducing the probability of the electrode tab cracking. The minimum distance D between the welding point and the outer periphery of the bottom wall, the hardness A of the metal plate, and the thickness W of the electrode tab, for which 0.0015 mm 2 / HB≤D*W / A≤0.3 mm 2 / HB can ensure current flow between the electrode terminal and the electrode tab while reducing the likelihood of the electrode tab breaking.

[0025] The battery disclosed in embodiments of the present application may be used in vehicles, but is not limited thereto, and may also be used in other electrical devices having structural supports, and the battery may be arranged so as not to interfere with structural supports of the electrical devices.

[0026] The battery disclosed in embodiments of the present application can be used, but is not limited to, in electrical devices with longitudinal beams, where the battery can avoid interference with such structural beams, such as in vehicles, ships, or aircraft. The power system of such electrical devices can consist of batteries with features disclosed in this application.

[0027] The electrode terminal disclosed in embodiments of the present application may be a terminal, the electrode assembly may be a battery cell, and one end of the electrode terminal is electrically connected to a bus bar and the other end is electrically connected to the electrode tab.

[0028] The electrode assembly disclosed in embodiments of the present application may be a unit formed by winding or laminating a stacked portion comprising a first electrode, a separator, and a second electrode. When the first electrode is a positive electrode, the second electrode is a negative electrode.

[0029] The present application provides an electrical device that uses a battery as a power source. The electrical device may include, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric bicycles, electric motorcycles, electric cars, ships, heavy trucks, buses, spacecraft, etc. Electric toys may include stationary or mobile electric toys, such as game consoles, electric toy cars, electric toy ships, and electric toy airplanes, etc. Spacecraft may include airplanes, rockets, space shuttles, and spaceships, etc.

[0030] For the sake of simplicity, in the following embodiments, a vehicle will be explained as an example of an electrical device in an embodiment of the present application.

[0031] A vehicle can be a fuel vehicle, a gas vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid vehicles, or extended-range vehicles. The vehicle type can be a sedan, an SUV, a heavy-duty truck, a bus, etc. The battery is installed in the vehicle and can be located on the floor, front, or rear of the vehicle. The battery can be used to supply power to the vehicle. For example, the battery can serve as the power source to operate the vehicle's circuitry, such as starting, navigating, and operating the vehicle, meeting operating power requirements.

[0032] The vehicle may also include a controller and a motor, with the controller controlling the battery to supply power to the motor. For example, the battery is used to meet the operating power requirements for starting, navigating, and driving the vehicle.

[0033] In some embodiments of the present application, the battery may serve not only as the operating power source of the vehicle, but also as the motive power source of the vehicle, replacing or partially replacing fuel or natural gas to provide motive power for the vehicle.

[0034] An embodiment of the present application provides a battery cell 100A. Referring to the Fig. 1 to 3 shows Fig. 1 is an exploded structural diagram of the battery cell 100A provided in an embodiment of the present application; Fig. 2 shows the positional relationship between a metal plate 150, an electrode terminal 120, and an electrode tab 140 in an embodiment of the present application; Fig. 3 shows structures of a weld 160 and a metal plate 150 in an embodiment of the present application.

[0035] The battery cell 100A includes a housing 110, an electrode terminal 120, an electrode assembly 130, an electrode tab 140, and a metal plate 150. The housing 110 has a first wall 111, with the electrode terminal 120 disposed on the first wall 111. The electrode assembly 130 is disposed within the housing 110. The electrode tab 140 extends from the end of the electrode assembly 130, is electrically connected to the electrode terminal 120, and is disposed within the housing 110. The electrode tab 140 has a first end 141 and a second end 142. The first end 141 is connected to the electrode assembly 130, and the second end 142 is disposed between the metal plate 150 and the electrode terminal 120. The metal plate 150, the second end 142 and the electrode terminal 120 are fixed to each other by welding.The metal plate 150 includes a main body portion 151 and a protruding portion 152, and the protruding portion 152 protrudes relative to the main body portion 151 toward the electrode terminal 120. The protruding portion 152 includes a bottom wall 152A and a peripheral wall 152B, wherein the peripheral wall 152B surrounds the outer periphery of the bottom wall 152A and connects the bottom wall 152A and the main body portion 151. A weld 160 is provided on the bottom wall 152A, a minimum distance between the weld 160 and the outer periphery of the bottom wall 152A is represented by D, a hardness of the metal plate 150 is represented by A, and a thickness of the electrode tab 140 is represented by W, where: 0.0015 mm. 2 / HB≤D*W / A≤0.3 mm 2 / HB.

[0036] The battery cell 100A includes the housing 110, the electrode terminal 120, the electrode assembly 130, the electrode tab 140, and the metal plate 150. The battery cell 100A is connected to external electrical devices via the electrode terminal 120. Within the battery cell 100A, i.e., in the housing 110, the electrode terminal 120 is electrically connected to the electrode assembly 130 through the electrode tab 140, thereby providing power to the electrical devices. The housing 110 has the first wall 111, with the electrode terminal 120 disposed on the first wall 111 and penetrating both sides of the first wall 111. That is, the electrode terminal 120 can be connected to both external electrical devices and the internal electrode assembly 130.The electrode tab 140 has the first end 141 and the second end 142. The first end 141 is connected to the electrode assembly 130, and the second end 142 is disposed between the metal plate 150 and the electrode terminal 120. That is, a portion of the electrode tab 140 is positioned between the metal plate 150 and the electrode terminal 120, while another portion is connected to the electrode assembly 130.

[0037] The metal plate 150, the second end 142, and the electrode terminal 120 are fixed to each other by welding. For example, the metal plate 150, the second end 142, and the electrode terminal 120 can be welded together by torque welding, with the metal plate 150 serving as the direct contact for torque welding. If the electrode tab 140 were welded directly to the electrode terminal 120 on the electrode tab side by torque welding, this would cause the electrode tab 140 to crack. Therefore, placing the second end 142 between the metal plate 150 and the electrode terminal 120 can reduce direct welding contact with the electrode tab 140 and prevent damage to the electrode tab 140, thereby reducing the likelihood of failures during the manufacturing of the battery cell 100A and thus improving the quality of the battery cell 100A.

[0038] The metal plate 150 includes a main body portion 151 and a protruding portion 152, and the protruding portion 152 protrudes toward both the electrode terminal 120 and the electrode tab 140 relative to the main body portion 151. During the welding process of the electrode tab 140 and the electrode terminal 120, the welding head exerts pressure on the metal plate 150. Under this pressure, the metal plate 150 compresses the second end 142 of the electrode tab 140, thereby forming the protruding portion 152 of the metal plate 150.The protruding portion 152 of the metal plate 150 includes a bottom wall 152A and a peripheral wall 152B, wherein the peripheral wall 152B surrounds the outer periphery of the bottom wall 152A and connects the bottom wall 152A and the main body portion 151, thereby providing a buffer effect between the metal plate 150 and the electrode tab 140, thereby reducing the likelihood of tearing of the electrode tab 140.

[0039] Since a weld 160 is formed on the bottom wall 152A when the metal plate 150 is welded to the electrode tab 140, the minimum distance between the weld 160 and the outer periphery of the bottom wall 152A is represented by D, and the area within which the minimum distance lies refers to the area not covered by the weld 160. With the hardness A of the metal plate 150 and the thickness W of the electrode tab 140, 0.0015 mm applies. 2 / HB≤D*W / A≤0.3 mm 2 / HB. Zum Beispiel kann D*W / A 0,0015 mm 2 / HB, 0,002 mm 2 / HB, 0,0025 mm 2 / HB, 0,003 mm 2 / HB, 0,004 mm 2 / HB, 0,005 mm 2 / HB, 0,006 mm 2 / HB, 0,008 mm 2 / HB, 0,01 mm 2 / HB, 0,02 mm 2 / HB, 0,05 mm 2 / HB, 0,1 mm 2 / HB, 0,15 mm 2 / HB, 0,2 mm 2 / HB, 0,25 mm 2 / HB, 0,3 mm 2 / HB, etc. During the welding process, the metal plate 150 forms a protruding portion 152. When the minimum distance D between the weld 160 and the outer periphery of the bottom wall 152A and the thickness W of the electrode tab 140 remain constant, if the hardness A of the metal plate 150 is too high, stress concentration may occur in the electrode tab 140 during the formation of the protrusion of the metal plate 150, which may lead to cracking of the electrode tab 140. If the hardness of the metal plate 150 is too low, the metal plate 150 may not provide effective cushioning to assist welding and may not prevent the electrode tab 140 from cracking.When the thickness W of the electrode tab 140 and the hardness A of the metal plate 150 remain constant, the closer the weld 160 is to the outer periphery of the bottom wall 152A, the greater the compression force on the electrode tab 140 by the outer periphery of the bottom wall 152A, which increases the risk of cracking or damage to the electrode tab 140. Conversely, as the distance between the weld 160 and the outer periphery of the bottom wall 152A increases, the effective welding area (the total area connecting the electrode tab 140 to the electrode terminal 120 through the weld 160) becomes smaller, which affects the current flow between the electrode tab 140 and the electrode terminal 120.If the hardness A of the metal plate 150 and the minimum distance D remain constant, if the electrode tab 140 is too thick, torque welding (resistance welding) may not work effectively, preventing proper welding of the electrode tab 140 and the electrode terminal 120. If the electrode tab 140 is too thin, this may, on the one hand, result in a weak weld between the electrode tab 140 and the electrode terminal 120 and possible tearing of the electrode tab 140; on the other hand, this may increase the internal resistance of the battery cell 100A, thus reducing the output power and efficiency of the battery cell 100A.

[0040] The minimum distance between the weld point 160 and the outer circumference of the bottom wall 152A is represented by D, the hardness of the metal plate 150 is represented by A and the thickness of the electrode tab 140 is represented by W, where: 0.0015 mm2 / HB≤D*W / A≤0.3 mm 2 / HB. For example, D*W / A can be 0.0015 mm 2 / HB, 0.002 mm 2 / HB, 0.0025 mm 2 / HB, 0.003 mm 2 / HB, 0.004 mm 2 / HB, 0.005 mm 2 / HB, 0.006 mm 2 / HB, 0.008 mm 2 / HB, 0.01 mm 2 / HB, 0.02 mm 2 / HB, 0.05 mm 2 / HB, 0.1 mm 2 / HB, 0.15 mm 2 / HB, 0.2 mm 2 / HB, 0.25 mm 2 / HB, 0.3 mm 2 / HB and so on, which effectively reduces the probability of tearing of the electrode tab 140 while maintaining good current flow between the electrode tab 140 and the electrode terminal 120, thereby improving the connection stability between the electrode tab 140 and the electrode terminal 120 and the quality of the manufactured battery cell 100A.

[0041] In some embodiments, the electrode tab 140 may be connected directly to the electrode terminal 120, or the electrode tab 140 may be connected to the electrode terminal 120 via a transition element 230.

[0042] In this embodiment, 15HB≤A≤60HB.

[0043] For example, hardness A can be 15HB, 16HB, 17HB, 19HB, 20HB, 25HB, 26HB, 30HB, 40HB, 45HB, 50HB, 55HB, 58HB, 60HB, etc. On the one hand, the hardness of the metal plate 150 is sufficient to ensure a stable weld connection between the electrode tab 140 and the electrode terminal 120, thereby ensuring the quality of the welding of the electrode tab 140 to the electrode terminal 120. On the other hand, the hardness is not too low to enable effective buffering to support the welding process, which could cause the electrode tab 140 to crack. Thus, 15HB≤A≤60HB improves the quality of the manufactured 100A battery cell, reduces the failure probability of the 100A battery cell, and increases the reliability of the 100A battery cell.

[0044] With reference to the Fig. 1 to 3, in this embodiment 0.3 mm≤D≤1.5 mm applies.

[0045] For example, the dimension of D can be 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, etc. On the one hand, a minimum distance D between the weld 160 and the outer periphery of the bottom wall 152A within the above range is sufficient to ensure proper current flow between the electrode terminal 120 and the electrode tab 140, which ensures performance and stable operation of the battery cell 100A and is beneficial for stable current transmission. On the other hand, the minimum distance D between the welding point 160 and the outer periphery of the bottom wall 152A can be prevented from being too small, thereby avoiding the protrusions formed between the outer periphery of the bottom wall 152A and the electrode tab 140 and preventing the electrode tab from cracking.Thus, the range of 0.3 mm≤D≤1.5 mm improves the quality of production and manufacturing of the 100A battery cell, reduces the probability of failure of the 100A battery cell, and increases the reliability of the 100A battery cell.

[0046] With reference to the Fig. 1 to 3, in this embodiment 0.3 mm≤W≤3 mm applies.

[0047] For example, the thickness W can be 0.3 mm, 0.4 mm, 0.6 mm, 0.9 mm, 1.2 mm, 1.3 mm, 1.6 mm, 1.8 mm, 2 mm, 2.3 mm, 2.5 mm, 2.8 mm, 2.9 mm, 3 mm. When the thickness W of the electrode tab falls within the above range, it improves the production and manufacturing quality of the battery cell 100A, reduces the probability of failure, and increases the reliability of the battery cell 100A.

[0048] With reference to Fig. 1 to 3, in this embodiment, along the thickness direction of the second end 142, the projection of the bottom wall 152A has a circular shape, where: 0.0015 mm 2 / HB≤D*W / A≤0.28 mm 2 / HB.

[0049] Along the thickness direction of the second end 142, the projection of the bottom wall 152A has a circular shape, which means that the projection of the bottom wall 152A on the electrode tab 140 has a circular shape. On the one hand, a circular shape of the contact surface between the bottom wall 152A and the electrode tab 140 provides a larger contact area, thereby reducing resistance during current transmission and improving efficiency. On the other hand, circular contact surfaces are easier to precisely control during manufacturing, thereby reducing manufacturing costs. In addition, a circular bottom wall 152A can reduce stress on the electrode tab 140 during the formation of the protruding portion 152, thereby reducing the likelihood of the electrode tab 140 cracking.

[0050] For example, when the projection of the bottom wall 152A has a circular shape along the thickness direction of the second end 142, D*W / A may be 0.0015 mm 2 / HB, 0.0018 mm 2 / HB, 0.002 mm 2 / HB, 0.11 mm 2 / HB, 0.15 mm 2 / HB, 0.20 mm 2 / HB, 0.22 mm 2 / HB, 0.23 mm 2 / HB, 0.25 mm 2 / HB, 0.28 mm 2 / HB, etc. This effectively reduces cracking of the electrode tab 140 while maintaining good performance of the battery cell 100A (that is, good current flow between the electrode tab 140 and the electrode terminal 120), thereby improving the connection stability between the electrode tab 140 and the electrode terminal 120 and improving the quality of the manufactured battery cell 100A.

[0051] With reference to Fig. 1 to 3, in this embodiment, along the thickness direction of the second end 142, the projection of the bottom wall 152A has a square shape, where: 0.0018 mm 2 / HB≤D*W / A≤0.3 mm 2 / HB.

[0052] For example, D*W / A can be 0.0018 mm 2 / HB, 0.002 mm 2 / HB, 0.003 mm 2 / HB, 0.01 mm 2 / HB, 0.02 mm 2 / HB, 0.05 mm 2 / HB, 0.1 mm 2 / HB, 0.11 mm 2 / HB, 0.12 mm 2 / HB, 0.13 mm 2 / HB, 0.15 mm 2 / HB, 0.16 mm 2 / HB, 0.17 mm 2 / HB, 0.18 mm 2 / HB, 0.19 mm 2 / HB, 0.20 mm 2 / HB, 0.21 mm 2 / HB, 0.22 mm 2 / HB, 0.23 mm 2 / HB, 0.24 mm 2 / HB, 0.25 mm 2 / HB, 0.26 mm 2 / HB, 0.27 mm 2 / HB, 0.28 mm 2 / HB, 0.29 mm 2 / HB, 0.30 mm 2 / HB, etc. When the contact area between the bottom wall 152A and the electrode tab 140 has a square shape, stress concentration is more likely to occur than when it is circular, so the minimum distance D between the square weld 160 and the outer periphery of the bottom wall 152A must be set larger than when the weld 160 has a circular shape. Based on this, when the projection of the square bottom wall 152A along the thickness direction of the second end 142 is: 0.0018 mm 2 / HB≤D*W / A≤0.3 mm 2 / HB, then this can effectively reduce the probability of cracking of the electrode tab 140 while maintaining good performance of the battery cell 100A (ie, good current flow between the electrode tab 140 and the electrode terminal 120), thereby improving the connection stability between the electrode tab 140 and the electrode terminal 120 and the quality of the manufactured battery cell 100A.

[0053] With reference to Fig. 1 to 3, the bottom wall 152A in this embodiment includes a central region 170 and a peripheral region 180, and the peripheral region 180 surrounds the central region 170. The weld 160 includes a plurality of welds, including a first weld 161 and a second weld 162. The first welds 161 are located in the peripheral region 180, and the second welds 162 are located in the central region 170, with the depth of the first welds 161 being less than the depth of the second welds 162.

[0054] The bottom wall 152A includes the central region 170 and the peripheral region 180, and the peripheral region 180 surrounds the central region 170. That is, the central region 170 is surrounded by the peripheral region 180. The plurality of welds 160 improves the connection strength between the electrode tab 140 and the electrode terminal 120, thereby improving the welding quality between the electrode tab 140 and the electrode terminal 120. Increasing the number of welds 160 helps to distribute heat and pressure during welding of the electrode tab 140 to the electrode terminal 120, thereby reducing the likelihood of stress concentration occurring at the electrode tab 140 and the electrode terminal 120 and improving the manufacturing quality and reliability of the battery cell 100A.

[0055] The plurality of welds includes first welds 161 and second welds 162. The plurality of first welds 161 may be evenly spaced and arranged at intervals in the peripheral region 180, while the plurality of second welds 162 may be evenly spaced and arranged at intervals in the central region 170, with the first welds 161 surrounding the second welds 162. The shallower depth of the first welds 161 compared to the second welds 162 means that the weld strength (joint strength) between the electrode tab 140 and the electrode terminal 120 at the second welds 162 is greater than that at the first welds 161.Since the stress generated by the metal plate 150 and the electrode tab 140 during welding using the metal plate 150 is mainly concentrated at the periphery of the bottom wall 152A and the electrode tab 140, reducing the depth of the first welds 161 means that the stress between the metal plate 150 and the electrode tab 140 at the periphery of the bottom wall 152A of the metal plate 150 is reduced, thereby reducing the likelihood of the electrode tab 140 cracking.

[0056] The depth of the second welds 162 is greater than the depth of the first welds 161. That is, the welding strength between the metal plate 150 and the electrode tab 140 is higher at the central region 170, thereby improving the stability and reliability of the connection between the metal plate 150 and the electrode tab 140, thereby improving the operational stability and reliability of the battery cell 100A.

[0057] With reference to Fig. 1 to 3 applies in this embodiment along the thickness direction of the second end 142 when the projection of the first weld 161 has a circular shape: 0.0015 mm 2 / HB≤D*W / A≤0.28 mm 2 / HB.

[0058] For example, D*W / A can be 0.0015 mm 2 / HB, 0.0016 mm 2 / HB, 0.0017 mm 2 / HB, 0.0018 mm 2 / HB, 0.002 mm 2 / HB, 0.003 mm 2 / HB, 0.01 mm 2 / HB, 0.02 mm 2 / HB, 0.05 mm2 / HB, 0,1 mm 2 / HB, 0,11 mm 2 / HB, 0,12 mm 2 / HB, 0,13 mm 2 / HB, 0,15 mm 2 / HB, 0,16 mm 2 / HB, 0,17 mm 2 / HB, 0,18 mm 2 / HB, 0,19 mm 2 / HB, 0,20 mm 2 / HB, 0,21 mm 2 / HB, 0,22 mm 2 / HB, 0,23 mm 2 / HB, 0,24 mm 2 / HB, 0,25 mm 2 / HB, 0,26 mm 2 / HB, 0,27 mm 2 / HB, 0,28 mm 2 / HB, etc. When the projection of the first weld 161 has a circular shape along the thickness direction of the second end 142, the circular shape helps reduce stress concentration. Since the first weld 161 is located in the portion of the peripheral region 180 near the periphery of the bottom wall 152A, the circular shape of the first weld 161 reduces the likelihood of cracking or damage to the electrode tab 140. Based on this, when the projection of the circular bottom wall 152A along the thickness direction of the second end 142 is: 0.0015 mm 2 / HB≤D*W / A≤0.28 mm 2 / HB, then this can effectively reduce the probability of cracking of the electrode tab 140 while maintaining good performance of the battery cell 100A (ie, good current flow between the electrode tab 140 and the electrode terminal 120), thereby improving the connection stability between the electrode tab 140 and the electrode terminal 120 and the quality of the manufactured battery cell 100A.

[0059] In some embodiments, if the first weld 161 has a circular shape, the second weld 162 may have either a square or a circular shape.

[0060] With reference to Fig. 1 to 3 applies in this embodiment along the thickness direction of the second end 142 when the projection of the first weld 161 has a square shape: 0.0018 mm 2 / HB≤D*W / A≤0.3 mm 2 / HB.

[0061] For example, D*W / A can be 0.0018 mm2 / HB, 0,002 mm 2 / HB, 0,003 mm 2 / HB, 0,01 mm 2 / HB, 0,02 mm 2 / HB, 0,05 mm 2 / HB, 0,1 mm 2 / HB, 0,11 mm 2 / HB, 0,12 mm 2 / HB, 0,13 mm 2 / HB, 0,15 mm 2 / HB, 0,16 mm 2 / HB, 0,17 mm 2 / HB, 0,18 mm 2 / HB, 0,19 mm 2 / HB, 0,20 mm 2 / HB, 0,21 mm 2 / HB, 0,22 mm 2 / HB, 0,23 mm 2 / HB, 0,24 mm 2 / HB, 0,25 mm 2 / HB, 0,26 mm 2 / HB, 0,27 mm 2 / HB, 0,28 mm 2 / HB, 0,29 mm 2 / HB, 0,30 mm 2 / HB, etc. When the contact surface between the bottom wall 152A and the electrode tab 140 has a square shape, stress concentration is more likely compared to a circular shape of the contact surface, therefore the minimum distance D between the square weld 160 and the outer circumference of the bottom wall 152A must be set larger than for a circular shape of the contact surface between the bottom wall 152A and the electrode tab 140. When along the thickness direction of the second end 142, the projection of the square bottom wall 152A is: 0.0018 mm 2 / HB≤D*W / A≤0.3 mm 2 / HB, then this can effectively reduce the probability of cracking of the electrode tab 140 while maintaining good performance of the battery cell 100A (ie, good current flow between the electrode tab 140 and the electrode terminal 120), thereby improving the connection stability between the electrode tab 140 and the electrode terminal 120 and the quality of the manufactured battery cell 100A.

[0062] In some embodiments, if the first weld 161 has a circular shape, the second weld 162 may have either a square or a circular shape.

[0063] With reference to Fig. 1 to 3, in this embodiment, the contact area between the welding point 160 and the electrode tab 140 is represented by S1, where: 20 mm 2 ≤S1≤120 mm 2 and 0.0015 mm 2 / HB≤D*W / A≤0.3 mm 2 / HB.

[0064] Beispielsweise kann S1 20 mm 2 , 30 mm 2 , 40 mm 2 , 50 mm 2 , 60 mm 2 , 70 mm 2 , 80 mm 2 , 90 mm 2 , 100 mm 2 , 110 mm 2 , 120 mm 2 usw. betragen. D*W / A kann 0,0015 mm 2 / HB, 0,0016 mm 2 / HB, 0,0017 mm 2 / HB, 0,0018 mm 2 / HB, 0,002 mm 2 / HB, 0,003 mm 2 / HB, 0,01 mm 2 / HB, 0,02 mm 2 / HB, 0,05 mm 2 / HB, 0,1 mm 2 / HB, 0,11 mm 2 / HB, 0,12 mm 2 / HB, 0,13 mm 2 / HB, 0,15 mm 2 / HB, 0,16 mm 2 / HB, 0,17 mm 2 / HB, 0,18 mm 2 / HB, 0,19 mm 2 / HB, 0,20 mm 2 / HB, 0,21 mm 2 / HB, 0,22 mm 2 / HB, 0,23 mm 2 / HB, 0,24 mm 2 / HB, 0,25 mm 2 / HB, 0,26 mm 2 / HB, 0,27 mm 2 / HB, 0,28 mm 2 / HB, 0,29 mm 2 / HB, 0,30 mm 2 / HB etc.

[0065] The larger the contact area between the weld 160 and the electrode tab 140, the higher the weld strength between the electrode tab 140 and both the metal plate 150 and the electrode terminal 120. Within a certain range, the larger the contact area between the weld 160 and the electrode tab 140, the more stable the connections between the electrode tab 140 and the metal plate 150 and between the electrode 140 and the electrode terminal 120.If the contact area S1 between the weld 160 and the electrode tab 140 satisfies: S1≥W1; F1≤D*W / A≤F2, then this can improve the connection stability between the electrode tab 140 and the electrode terminal 120 while reducing the probability of cracking or damage to the electrode tab 140, thereby improving the quality of the battery cell 100A and improving the usage stability and reliability of the battery cell 100A.

[0066] With reference to Fig. 1 to 3, the bottom wall 152A in this embodiment has a first side surface facing away from the electrode terminal 120, and the first side surface is provided with a first annular groove 240 surrounding the outer periphery of the weld 160.

[0067] During welding, the welding head exerts pressure on the metal plate 150, creating recesses between the weld 160 and the electrode tab 140. The outer periphery of the weld 160 may cause protrusions in the electrode tab 140 while creating recesses. If additional welds 160 are formed at these protrusions, the electrode tab 140 would crack, causing damage to the electrode tab 140. Therefore, the bottom wall 152A has the first side surface facing away from the electrode terminal 120. A first annular groove 240 is provided on the first side surface, enclosing the outer periphery of the weld 160.This configuration can reduce the likelihood of protrusions forming on the electrode tab 140, improve the connection stability between the electrode tab 140 and the electrode terminal 120, and reduce the risk of cracking or damage to the electrode tab 140. Consequently, the quality of the battery cell 100A is improved, and the operational stability and reliability of the battery cell 100A are increased.

[0068] With reference to Fig. 1 to 3, in this embodiment, a plurality of welds 160 and first annular grooves 240 are present in one-to-one correspondence, wherein a minimum distance f between adjacent first annular grooves 240 applies: 0.5 mm≤f≤3 mm.

[0069] For example, f may be 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 2.0 mm, 2.1 mm, 2.2 mm, 2.5 mm, 2.6 mm, 3.0 mm, etc. The plurality of welds 160 and the plurality of first annular grooves 240 are provided in one-to-one correspondence, and the minimum distance f between two adjacent first annular grooves 240 is 0.5 mm≤f≤3 mm, thereby reducing the likelihood of cracking or damage to the electrode tab 140, improving the quality of the battery cell 100A, and increasing the operational stability and reliability of the battery cell 100A.

[0070] With reference to the Fig. 1 to 3, in this embodiment, the contact area between the welding point 160 and the electrode tab 140 is represented by S1 and the area of ​​the first annular groove 240 is represented by S3, where: 2.5≤S1 / S3≤240.

[0071] For example, S1 / S3 can be 2.5, 3, 6, 9, 10, 25, 30, 35, 60, 80, 90, 100, 110, 120, 140, 150, 160, 180, 190, 220, 230, 240, etc. The arrangement of the first annular groove 240 around the weld 160 is intended to reduce the likelihood of the electrode tab 140 cracking and to reduce the stress concentration on the electrode tab 140. If S1 / S3 is too large, this indicates that the area of ​​the first annular groove 240 is too small, which is unfavorable for reducing the stress concentration on the electrode tab 140. Conversely, if S1 / S3 is too small, it indicates that the contact area between the weld 160 and the electrode tab 140 is too small, which affects the area of ​​the fixed connection between the electrode tab 140 and the electrode terminal 120 and thus increases the internal resistance of the battery cell 100A, thereby reducing the current delivery capability of the battery.As a result, the contact area S1 between the weld 160 and the tab 140 and the area S3 of the first annular groove 240 satisfy 2.5 ≤ S1 / S3 ≤ 240, which can improve the stability of the connection between the electrode tab 140 and the electrode terminal 120, while reducing the probability of the electrode tab 140 being cracked or damaged, thereby improving the quality of the battery cell 100A and increasing the stability and reliability of the battery cell 100A in operation.

[0072] With reference to Fig. 1 to 3, the main body portion 151 in this embodiment includes a first main body portion 210 and a second main body portion 151. The second main body portion 151 surrounds the outer periphery of the first main body portion 210. The first main body portion 210 connects the second main body portion 151 and the protruding portion 152, wherein the second main body portion 151 is bent in a direction away from the electrode tab 140.

[0073] The metal plate 150 includes the main body portion 151, and the main body portion 151 includes the first main body portion 210 and the second main body portion 151. The second main body portion 151 surrounds the outer periphery of the first main body portion 210. That is, the second main body portion 151 is located on the outside of the first main body portion 210, and the first main body portion 210 is located on the inside of the second main body portion 151. The protruding portion 152 and the second main body portion 151 are connected by the first main body portion 210. The second main body portion 151 is bent in a direction away from the electrode tab 140.In fact, the outer periphery of the metal plate 150 is bent in the direction away from the tab 140, which can reduce the probability of scratching between the second main body portion 151 (i.e., the edge of the metal plate 150) and the electrode tab 140, reducing the probability of cracking or damage to the electrode tab 140, improving the quality of the battery cell 100A, and improving the stability and reliability of the battery cell 100A in operation.

[0074] With reference to Fig. 4, in this embodiment, along the thickness direction of the second end 142, a part of the projection of the second main body portion 151 overlaps with the projection of the first main body portion 210.

[0075] During the assembly and manufacturing process of the battery cell 100A, during the assembly of the battery core, the second main body part 151 of the metal plate 150 is susceptible to causing damage to the electrode tab 140, the electrode terminals 120, or other internal components such as the plastic separator of the battery cell 100A.

[0076] The second main body portion 151 includes a first plate 221 and a second plate 222 that extend perpendicular to each other. The second plate 222 is connected to the first main body portion 210 by the first plate 221. In the thickness direction of the second end 142, a portion of the projection of the second main body portion 151 overlaps with the projection of the first main body portion 210. That is, in the thickness direction of the second end 142, the second plate 222 overlaps with the projection of the first main body portion 210. This can reduce the likelihood of the second main body portion damaging other components within the battery during the battery assembly process, improve the battery assembly quality, and improve the operational stability and reliability of the battery cell 100A.

[0077] With reference to Fig. 1 to 3, in this embodiment, the metal plate 150 is formed as a circular metal plate 150.

[0078] Compared with a square metal plate, the circular metal plate 150 has no sharp corners, which reduces the likelihood of the metal plate 150 scratching the electrode tab 140 or other internal components of the battery cell 100A, reduces the likelihood of the electrode tab 140 being damaged, improves the quality of the battery cell 100A, and improves the stability and reliability of the battery cell 100A during operation.

[0079] With reference to Fig. 1 to 3, in this embodiment, the electrode tab 140, the electrode terminal 120 and the metal plate 150 are fixed and connected by ultrasonic welding.

[0080] The electrode tab 140, the electrode terminal 120, and the metal plate 150 are fixed and connected by ultrasonic welding. This, on the one hand, increases the stability of the connection between the electrode tab 140, the electrode terminal 120, and the metal plate 150 due to the high stability and reliability of ultrasonic welding. On the other hand, ultrasonic welding ensures an extremely high welding speed, which significantly improves production efficiency in the mass production of 100A battery cells.

[0081] Furthermore, ultrasonic welding does not require bolts, nails, adhesives, or welding materials, thus producing no smoke, harmful gases, or pollutants. This is not only environmentally friendly but also reduces health risks for personnel. Compared with other welding processes, ultrasonic welding is less expensive. On the one hand, the equipment used for ultrasonic welding is simple, mold design is relatively easy, and quick mold changes are possible, thus increasing equipment utilization and versatility. On the other hand, the short welding time for ultrasonic welding eliminates the need for complex ventilation systems to remove smoke or cooling systems to remove excess heat, thus saving energy.

[0082] With reference to Fig.1 to 4, an embodiment of the present application further provides an electrical device including any of the battery cells 100A described in the embodiments of the present application.

[0083] In the electrical device of this embodiment, the minimum distance D between the welding point 160 and the outer circumference of the bottom wall 152A, the hardness A of the metal plate 150 and the thickness W of the electrode tab 140: 0.0015 mm 2 / HB≤D*W / A≤0.3 mm 2 / HB. For example, D*W / A can be 0.0015 mm 2 / HB, 0.002 mm 2 / HB, 0.0025 mm 2 / HB, 0.003 mm 2 / HB, 0.004 mm 2 / HB, 0.005 mm 2 / HB, 0.006 mm 2 / HB, 0.008 mm 2 / HB, 0.01 mm 2 / HB, 0.02 mm 2 / HB, 0.05 mm 2 / HB, 0.1 mm 2 / HB, 0.15 mm 2 / HB, 0.2 mm 2 / HB, 0.25 mm 2 / HB, 0.3 mm 2 / HB etc.

[0084] It should be noted that the terms "including," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, product, or device that includes a number of elements may include not only those elements, but also other elements not explicitly listed, or may include elements that are inherent in such a process, method, product, or device. Without additional limitation, the elements limited by the phrase "including a..." do not preclude the existence of other identical elements in the process, method, product, or device that include those elements.

[0085] Each embodiment in this specification is described sequentially, with similar parts between embodiments being cross-referenced. For each embodiment, the focus is on describing its differences from other embodiments. In particular, for the system embodiments, the descriptions are simpler because they are essentially similar to the method embodiments, and relevant parts of the method embodiments can be referenced.

[0086] The above descriptions are merely embodiments of the present application and are not intended to limit the present application. Various modifications and variations will be apparent to those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present application are intended to be included within the scope of the claims of the present application.

[0087] Although the embodiments of the present application have been described in conjunction with the drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present application, and such modifications and variations fall within the scope defined by the appended claims.

Claims

[1] Battery cell, comprising: a housing having a first wall; an electrode terminal arranged on the first wall; an electrode assembly disposed in the housing; an electrode tab extending from one end of the electrode assembly and electrically connected to the electrode terminal and disposed in the housing, the electrode tab having a first end and a second end, the first end connected to the electrode assembly; a metal plate, wherein the second end is arranged between the metal plate and the electrode terminal, and the metal plate, the second end and the electrode terminal are fixed to each other by welding, wherein the metal plate comprises a main body portion and a protruding portion, the protruding portion protrudes toward the electrode terminal relative to the main body portion, the protruding portion comprises a bottom wall and a peripheral wall, the peripheral wall surrounds an outer periphery of the bottom wall and connects the bottom wall and the main body portion, a welding point is provided on the bottom wall, a minimum distance between the welding point and the outer circumference of the bottom wall is represented by D, a hardness of the metal plate is represented by A, a thickness of the electrode tab is represented by W and the following applies: 0.0015 mm 2 / HB≤D*W / A≤0.3 mm 2 / HB. [2] Battery cell according to one of the preceding claims, wherein: 15HB≤A≤60HB. [3] Battery cell according to one of the preceding claims, wherein: 0.3 mm≤D≤1.5 mm. [4] Battery cell according to one of the preceding claims, wherein: 0.3 mm≤W≤3 mm. [5] Battery cell according to one of the preceding claims, wherein along a thickness direction of the second end, a projection of the bottom wall is formed to have a circular shape, wherein: 0.0015 mm 2 / HB≤D*W / A≤0.28 mm 2 / HB. [6] Battery cell according to one of the preceding claims, wherein along a thickness direction of the second end, a projection of the bottom wall is formed to have a square shape, where: 0.0018 mm 2 / HB≤D*W / A≤0.3 mm 2 / HB. [7] A battery cell according to any one of the preceding claims, wherein the bottom wall comprises a central region and a peripheral region surrounding the central region; the weld comprises a plurality of welds including a first weld and a second weld, the first weld is arranged in the peripheral region, the second weld is arranged in the central region, and a depth of the first weld is less than a depth of the second weld. [8] Battery cell according to claim 7, wherein along a thickness direction of the second end, a projection of the first weld has a circular shape, where: 0.0015 mm 2 / HB≤D*W / A≤0.28 mm 2 / HB. [9] Battery cell according to claim 7 or 8, wherein along a thickness direction of the second end, a projection of the first weld has a square shape, where: 0.0018 mm 2 / HB≤D*W / A≤0.3 mm 2 / HB. [10] Battery cell according to one of the preceding claims, wherein a contact area between the welding point and the electrode tab is represented by S1, where: 20 mm 2 ≤S1≤120 mm 2 ; and 0.0015 mm 2 / HB≤D*W / A≤0.3 mm 2 / HB. [11] Battery cell according to one of the preceding claims, wherein the bottom wall has a first side surface away from the electrode terminal, the first side surface is provided with a first annular groove and the first annular groove surrounds an outer periphery of the weld. [12] Battery cell according to claim 11, wherein the weld and the first annular groove are each present in multiples and are present in a one-to-one correspondence and a minimum distance between two adjacent first annular grooves is represented by f, where: 0.5 mm≤f≤3 mm. [13] The battery cell according to claim 11 or 12, wherein a contact area between the welding point and the electrode tab is represented by S1 and an area of ​​the first annular groove is represented by S3, where 2.5≤S1 / S3≤240. [14] A battery cell according to any one of the preceding claims, wherein the main body portion comprises a first main body portion and a second main body portion, the second main body portion surrounds an outer periphery of the first main body portion, the first main body portion connects the second main body portion and the protruding portion, and the second main body portion is bent in a direction away from the electrode tab. [15] The battery cell according to claim 14, wherein along a thickness direction of the second end, a part of a projection of the second main body portion overlaps with a projection of the first main body portion. [16] Battery cell according to one of the preceding claims, wherein the metal plate is formed as a circular metal plate. [17] Battery cell according to one of the preceding claims, wherein the electrode tab, the electrode terminal and the metal plate are fixed and connected to each other by ultrasonic welding. [18] Battery cell according to one of the preceding claims, wherein the battery cell is a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium-metal battery, a sodium-metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-hydride battery, a nickel-cadmium battery or a lead-acid battery. [19] An electrical device, the electrical device comprising the battery cell according to any one of the preceding claims. [20] An electrical device according to claim 19, wherein the electrical device is a vehicle, a ship or an aircraft. [21] The electrical device of claim 19, wherein the electrical device is a vehicle and includes a controller and a motor, the controller controlling the battery to power the motor.

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