Battery cell, battery and electric device

Abstract

The present application relates to the field of batteries. Provided are a battery cell, a battery and an electric device. The battery cell comprises a casing and an electrode assembly, wherein the electrode assembly is accommodated in the casing. The electrode assembly comprises a body portion, a first tab and a second tab, wherein the first tab and the second tab respectively protrude from two ends of the body portion, and the first tab and the second tab are asymmetrically arranged. The first tab and the second tab of the battery cell are asymmetrically arranged; and compared with the solution in the prior art where two tabs of a battery cell are symmetrically arranged, the first tab and the second tab of the electrode assembly of the battery cell have no axis of symmetry, and the first tab and the second tab are stressed unevenly, such that the electrode assembly does not easily rotate, and thus the first tab and the second tab are not easily torn, thereby facilitating the prolonging of the service life of the battery cell.

Description

Battery cells, batteries and electrical equipment CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims priority to the Chinese patent application entitled “Battery Cell, Battery and Electrical Equipment” filed on March 6, 2024 (application number: 202410256669.0), the entire contents of which are incorporated herein by reference. Technical Field

[0002] The present application relates to the field of batteries, and more specifically, to a battery cell, a battery, and an electrical device. Background Art

[0003] Batteries are widely used in new energy applications, such as electric vehicles and new energy vehicles. These have become a new trend in the automotive industry. The development of battery technology requires consideration of multiple design factors, including performance parameters such as energy density, discharge capacity, and charge / discharge rate. Furthermore, battery life must be considered. However, current batteries have a relatively short lifespan. Summary of the Invention

[0004] The purpose of the embodiments of the present application is to provide a battery cell, a battery, and an electrical device, which are intended to improve the problem of short battery life in the related art.

[0005] In a first aspect, an embodiment of the present application provides a battery cell, which includes a shell and an electrode assembly, wherein the electrode assembly is accommodated in the shell, and the electrode assembly includes a main body, a first pole tab and a second pole tab, wherein the first pole tab and the second pole tab protrude from both ends of the main body respectively; wherein the first pole tab and the second pole tab are asymmetrically arranged.

[0006] In the above technical solution, the first pole ear and the second pole ear of the battery cell are asymmetrically arranged. Compared with the solution in the prior art in which the two pole ears of the battery cell are symmetrically arranged, the first pole ear and the second pole ear of the electrode assembly of the battery cell do not have a symmetry axis, the first pole ear and the second pole ear are subjected to uneven force, the electrode assembly is not easy to rotate, and it is not easy to cause the first pole ear and the second pole ear to tear, which is beneficial to improving the life of the battery cell.

[0007] As an optional technical solution of an embodiment of the present application, the first pole tab and the second pole tab respectively protrude from the two ends of the main body along the first direction; the first pole tab has a first middle cross-section parallel to the first direction, and the second pole tab has a second middle cross-section parallel to the first direction, the first middle cross-section and the second middle cross-section are spaced apart along the second direction, and the second direction intersects with the first direction.

[0008] In the above technical solution, a distance exists between the first midsection of the first tab and the second midsection of the second tab along the second direction, and the first midsection and the second midsection are not in the same plane. Thus, the first tab and the second tab can be offset in the first direction. When the battery cell is subjected to vibration, the first tab and the second tab are subjected to different forces, making it less likely that the electrode assembly will rotate under external forces, and thus less likely that the first tab and the second tab will tear, thereby improving the lifespan of the battery cell. Furthermore, because the first midsection and the second midsection are spaced apart along the second direction, the center-to-center distance between the first tab and the second tab is increased, and the heat generated by the first tab and the second tab are less likely to affect each other, thereby improving the lifespan of the battery cell.

[0009] As an optional technical solution of an embodiment of the present application, the shell includes a first wall portion, which is provided with a liquid injection hole; along the first direction, the first electrode tab is arranged opposite to the first wall portion, and the projection of the liquid injection hole does not overlap with the projection of the first electrode tab.

[0010] In the above technical solution, by making the projection of the injection hole and the projection of the first tab non-overlapping, the first tab can avoid the injection hole, making it difficult for the first tab and the injection hole to interfere. When injecting liquid, the first tab is unlikely to block the injection hole.

[0011] As an optional technical solution of an embodiment of the present application, the main body has a first end face at one end along the first direction, the first pole ear protrudes from the first end face, and the first end face includes a first area and a second area; along the second direction, the first area and the second area are respectively located on both sides of the first pole ear, and the maximum length of the first area is greater than the maximum length of the second area; along the first direction, the projection of the injection hole is located in the first area.

[0012] In the above technical solution, the maximum length of the first region along the second direction is greater than the maximum length of the second region along the second direction. Compared with the prior art, the first electrode ear is offset, which not only enables the first electrode ear and the second electrode ear to be asymmetrically arranged, reducing the risk of rotation of the electrode assembly, but also avoids the injection hole, reducing the risk of the first electrode ear blocking the injection hole during injection.

[0013] As an optional technical solution of an embodiment of the present application, the shell includes a first wall portion, which is provided with a pressure relief mechanism; along the first direction, the first pole ear is arranged opposite to the first wall portion, and the projection of the pressure relief mechanism does not overlap with the projection of the first pole ear.

[0014] In the above technical solution, by making the projection of the pressure relief mechanism non-overlapping with the projection of the first electrode tab, the first electrode tab can avoid the pressure relief mechanism, making it less likely for the first electrode tab and the pressure relief mechanism to interfere with each other and affect the pressure relief of the pressure relief mechanism.

[0015] As an optional technical solution of an embodiment of the present application, the main body has a first end face at one end along the first direction, the first pole ear protrudes from the first end face, and the first end face includes a first area and a second area; along the second direction, the first area and the second area are respectively located on both sides of the first pole ear, and the maximum length of the first area is greater than the maximum length of the second area; along the first direction, the projection of the pressure relief mechanism is located in the first area.

[0016] In the above technical solution, the maximum length of the first region along the second direction is greater than the maximum length of the second region along the second direction. Compared with the prior art, the first pole ear is offset, which not only enables the first pole ear and the second pole ear to be asymmetrically arranged, reducing the risk of rotation of the electrode assembly, but also avoids the pressure relief mechanism, making it less likely for the first pole ear to affect the pressure relief mechanism.

[0017] As an optional technical solution of an embodiment of the present application, along the second direction, the width of the first pole tab is smaller than the width of the second pole tab.

[0018] In the above technical solution, by making the width of the first electrode tab smaller than that of the second electrode tab, the first electrode tab can better avoid the liquid injection hole or the pressure relief mechanism, and the first electrode tab is less likely to affect the liquid injection of the liquid injection hole or the pressure relief mechanism.

[0019] As an optional technical solution of the embodiment of the present application, along the first direction, the height of the first pole tab protruding from the main body is greater than the height of the second pole tab protruding from the main body.

[0020] In the above technical solution, the width of the first tab is smaller than the width of the second tab, which results in a smaller welding area between the first tab and the conductive structure than when the second tab is welded to the corresponding conductive structure. This results in a smaller flow area at the welding point between the first tab and the conductive structure. By increasing the height of the first tab protruding from the main body to be greater than the height of the second tab protruding from the main body, the welding area between the first tab and the conductive structure is increased, thereby increasing the flow area at the welding point between the first tab and the conductive structure.

[0021] As an optional technical solution of an embodiment of the present application, the battery cell includes a first conductive member and a second conductive member, the first electrode tab and the first conductive member are welded to form a first weld print area, the area of ​​the first weld print area is S1, the second electrode tab and the second conductive member are welded to form a second weld print area, the area of ​​the second weld print area is S2, and the following conditions are satisfied: 0.8≤S1 / S2≤1.2.

[0022] In the above technical solution, the ratio of the area of ​​the first weld print area to the area of ​​the second weld print area is between 0.8 and 1.2, indicating that the area of ​​the first weld print area is roughly equal to the area of ​​the second weld print area. In this way, the flow area at the connection position of the first electrode tab and the first conductive member is roughly the same as the flow area at the connection position of the second electrode tab and the second conductive member.

[0023] As an optional technical solution of an embodiment of the present application, 0.9≤S1 / S2≤1.1.

[0024] In the above technical solution, the ratio of the area of ​​the first weld print area to the area of ​​the second weld print area is between 0.9 and 1.1, indicating that the area of ​​the first weld print area is closer to the area of ​​the second weld print area. In this way, the flow area of ​​the connection position between the first electrode tab and the first conductive member is roughly the same as the flow area of ​​the connection position between the second electrode tab and the second conductive member.

[0025] As an optional technical solution of an embodiment of the present application, the battery cell includes a first electrode terminal and a first adapter, the first electrode terminal is arranged on the shell, the first adapter connects the first electrode terminal and the first tab, and the first adapter includes the first conductive member.

[0026] In the above technical solution, the first tab is electrically connected to the first electrode terminal through the first adapter. The first adapter and the first tab, and the first adapter and the first electrode terminal can be welded separately, thereby facilitating manufacturing.

[0027] As an optional technical solution of the embodiment of the present application, the first weld print area includes a first weld print portion and a second weld print portion. Along the second direction, the first weld print portion and the second weld print portion are respectively located on both sides of the first electrode terminal.

[0028] In the above technical solution, along the second direction, the first electrode terminal is respectively provided with a first weld stamp and a second weld stamp, that is, the first electrode tab is welded to the first adapter on both sides of the first electrode terminal. In this way, the first electrode tab is restricted on both sides of the first electrode terminal, so that when the battery cell is vibrated, the first electrode tab is not easy to swing, which is beneficial to improving the structural stability of the electrode assembly and increasing the life of the battery cell.

[0029] As an optional technical solution of an embodiment of the present application, the battery cell includes a second electrode terminal and a second adapter, the second electrode terminal is arranged on the shell, the second adapter connects the second electrode terminal and the second tab, and the second adapter includes the second conductive member.

[0030] In the above technical solution, the second tab is electrically connected to the second electrode terminal via the second adapter. The second adapter and the second tab, and the second adapter and the second electrode terminal can be welded respectively, thereby facilitating manufacturing.

[0031] As an optional technical solution of the embodiment of the present application, the second weld print area includes a third weld print portion and a fourth weld print portion. Along the second direction, the third weld print portion and the fourth weld print portion are respectively located on both sides of the second electrode terminal.

[0032] In the above technical solution, a third weld stamp portion and a fourth weld stamp portion are respectively provided on both sides of the second electrode terminal along the second direction, that is, the second pole tab is welded to the second adapter on both sides of the second electrode terminal. In this way, the second pole tab is restricted on both sides of the second electrode terminal, so that when the battery cell is vibrated, the second pole tab is not easy to swing, which is beneficial to improving the structural stability of the electrode assembly and increasing the life of the battery cell.

[0033] As an optional technical solution of an embodiment of the present application, the first electrode tab is a negative electrode tab, and the second electrode tab is a positive electrode tab.

[0034] In the above technical solution, generally speaking, the heat generated by the positive electrode tab will be higher than the heat generated by the negative electrode tab. In some embodiments of the present application, the width of the negative electrode tab is smaller than the width of the positive electrode tab, and the height of the negative electrode tab protruding from the main body is greater than the height of the positive electrode tab protruding from the main body. In comparison, the cross-sectional area of ​​the negative electrode tab along the direction perpendicular to its extension direction is smaller than the cross-sectional area of ​​the positive electrode tab along the direction perpendicular to its extension direction, and the flow area of ​​the positive electrode tab will be slightly larger than the flow area of ​​the negative electrode tab, thereby reducing the heat generated by the positive electrode tab.

[0035] As an optional technical solution of an embodiment of the present application, the main body has a third middle section parallel to the first direction; wherein, the third middle section coincides with the second middle section, and the third middle section is spaced apart from the first middle section along the second direction; or along the second direction, the first middle section and the second middle section are located on both sides of the third middle section.

[0036] In the above technical solution, when the third mid-section coincides with the second mid-section and the third mid-section is spaced apart from the first mid-section along the second direction, the first tab deviates from the third mid-section, thereby increasing the center-to-center distance between the first tab and the second tab. Heat generation from the first tab and the second tab is less likely to affect each other, which is beneficial for improving the lifespan of the battery cell. Along the second direction, when the first and second mid-sections are located on either side of the third mid-section, the first tab can deviate upward from the third mid-section along the second direction, and the second tab can deviate downward from the third mid-section along the second direction, thereby further increasing the center-to-center distance between the first tab and the second tab. The further distance between the first and second tabs makes it less likely that heat generation from each other will affect each other, further contributing to improved battery life.

[0037] As an optional technical solution of an embodiment of the present application, along the second direction, the distance between the first middle section and the second middle section is A, and the maximum size of the main body is L, satisfying: 0.05≤A / L≤0.5.

[0038] In the above technical solution, by making the ratio of the distance between the first middle cross-section and the second middle cross-section to the maximum dimension of the main body along the second direction between 0.05 and 0.5, the distance between the first middle cross-section and the second middle cross-section is larger, and the heat generated by the first pole ear and the heat generated by the second pole ear are less likely to affect each other, which is beneficial to improving the life of the battery cell.

[0039] As an optional technical solution of the embodiment of the present application, 0.1≤A / L≤0.3.

[0040] In the above technical solution, by setting the ratio of the distance between the first and second mid-sections to the maximum dimension of the main body along the second direction to be between 0.1 and 0.3, the distance between the first and second mid-sections is increased, which reduces the mutual influence of heat generated by the first and second tabs, thereby improving the lifespan of the battery cell. Furthermore, the widths of the first and second tabs can be set relatively wide, ensuring a certain degree of flow area for the first and second tabs.

[0041] As an optional technical solution of an embodiment of the present application, the shell is a square shell, the length of the shell along the second direction is H, the length of the shell along the first direction is B, and the thickness of the shell is D, satisfying: B / H≥2.4, and H≥D; the first direction is the width direction of the shell, and the second direction is the height direction of the shell.

[0042] In the above technical solution, the aspect ratio of the shell is greater than or equal to 2.4. The internal space of this battery cell is small. The above-mentioned asymmetric pole ear design can not only make the first pole ear and the second pole ear bear uneven force, but also make the electrode assembly less likely to rotate and less likely to cause the first pole ear and the second pole ear to tear, which is beneficial to improving the life of the battery cell, but also can make full use of the internal space of the battery cell and improve the energy density of the battery cell.

[0043] As an optional technical solution of the embodiment of the present application, B / H≥3.

[0044] In the above technical solution, the aspect ratio of the shell is greater than or equal to 3, and the internal space of such a battery cell is smaller. The above-mentioned asymmetric pole ear design not only makes the first pole ear and the second pole ear bear uneven force, but also makes the electrode assembly less likely to rotate and less likely to cause the first pole ear and the second pole ear to tear, which is beneficial to improving the life of the battery cell, but also can make full use of the internal space of the battery cell and improve the energy density of the battery cell.

[0045] As an optional technical solution of an embodiment of the present application, the first pole ear and the second pole ear respectively protrude from the two ends of the main body along the first direction; the outer shell includes a shell, a first end cover and a second end cover, and along the first direction, the two ends of the shell have openings; the first end cover and the second end cover respectively close the openings at the two ends of the shell.

[0046] In the above technical solution, the first end cover and the second end cover respectively close the openings at both ends of the shell, the first electrode ear can be electrically connected to the conductive structure on the first end cover, and the second electrode ear can be electrically connected to the conductive structure on the second end cover, which is simple and convenient to manufacture.

[0047] In a second aspect, an embodiment of the present application further provides a battery, which includes the above-mentioned battery cell.

[0048] In a third aspect, an embodiment of the present application further provides an electrical device, which includes the above-mentioned battery cell or the above-mentioned battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0050] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0051] FIG2 is an exploded view of a battery provided in some embodiments of the present application;

[0052] FIG3 is a schematic structural diagram of a battery cell provided in some embodiments of the present application;

[0053] FIG4 is an exploded view of a battery cell provided in some embodiments of the present application;

[0054] FIG5 is a schematic structural diagram of an electrode assembly provided in some embodiments of the present application;

[0055] FIG6 is a schematic front view of an electrode assembly provided in some embodiments of the present application;

[0056] FIG7 is a schematic front view of a battery cell provided in some embodiments of the present application;

[0057] FIG8 is a cross-sectional view taken along line AA in FIG7 ;

[0058] FIG9 is a simplified schematic diagram of electrode assembly welding according to some embodiments of the present application;

[0059] FIG10 is a schematic top view of an electrode assembly provided in some embodiments of the present application;

[0060] FIG11 is a bottom view schematic diagram of an electrode assembly provided in some embodiments of the present application;

[0061] FIG12 is a simplified schematic diagram of electrode assembly welding according to other embodiments of the present application;

[0062] FIG13 is a schematic front view of an electrode assembly provided in some other embodiments of the present application;

[0063] FIG14 is a schematic side view of a battery cell provided in some embodiments of the present application.

[0064] Icons: 10 - housing; 11 - first part; 12 - second part; 20 - battery cell; 21 - outer shell; 211 - housing; 212 - first end cap; 2121 - injection hole; 213 - second end cap; 22 - electrode assembly; 221 - main body; 2211 - third mid-section; 2212 - first end face; 2212a - first region; 2212b - second region; 2213 - second end face; 2213a - third region; 2213b - fourth region; 222-first electrode tab; 2221-first mid-section; 223-second electrode tab; 2231-second mid-section; 231-first electrode terminal; 232-second electrode terminal; 241-first conductive element; 2411-first weld print; 2412-second weld print; 242-second conductive element; 2421-third weld print; 2422-fourth weld print; 25-pressure relief mechanism; 100-battery; 200-controller; 300-motor; 1000-vehicle. DETAILED DESCRIPTION

[0065] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0066] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0067] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0068] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0069] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0070] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0071] The term "plurality" used in this application refers to two or more (including two).

[0072] In this application, battery cells may include, but are not limited to, lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries. Battery cells may be cylindrical, flat, rectangular, or in other shapes. Battery cells may include cylindrical, prismatic, and pouch-type battery cells.

[0073] The battery referred to in the embodiments of this application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in this application may include a battery module or a battery pack. A battery generally includes a casing for enclosing 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.

[0074] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly consists of a positive electrode sheet, a negative electrode sheet, and a separator. A battery cell primarily operates by the movement of metal ions between the positive and negative electrode sheets. 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 electrode collector. The uncoated positive electrode collector protrudes from the coated positive electrode collector, and the uncoated positive electrode collector serves as the positive electrode tab. For lithium-ion batteries, for example, the positive electrode current collector can be made of aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide. The negative electrode sheet includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative electrode collector. The uncoated negative electrode collector protrudes from the coated negative electrode collector, and the uncoated negative electrode collector serves as the negative electrode tab. The negative electrode current collector can be made of copper, and the negative electrode active material can be carbon or silicon, among others. To ensure that high currents can flow without fusing, the positive electrode tabs are multiple and stacked together, and the negative electrode tabs are multiple and stacked together. The separator can be made of materials such as PP (polypropylene) or PE (polyethylene). Furthermore, the electrode assembly can be a wound or laminated structure, but the embodiments of the present application are not limited thereto.

[0075] Currently, market developments indicate that batteries are increasingly being used. They are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. As battery applications continue to expand, market demand is also growing.

[0076] The development of battery technology requires simultaneous consideration of multiple design factors, including performance parameters such as energy density, discharge capacity, and charge / discharge rate. Furthermore, battery life must be considered. However, current batteries have a relatively short lifespan.

[0077] In the prior art, an electrode assembly includes a main body and two tabs, each protruding from either end of the main body and symmetrically arranged. However, when a battery cell made with this electrode assembly is subjected to vibration, the two tabs are subject to the same force, and the two tabs are susceptible to slight rotation about the line connecting their center points under the action of external forces. This can cause the tabs to tear, damage the battery cell, and shorten the battery cell lifespan.

[0078] In view of this, an embodiment of the present application provides a battery cell, comprising a housing and an electrode assembly, wherein the electrode assembly is housed within the housing. The electrode assembly comprises a main body, a first tab, and a second tab, wherein the first tab and the second tab protrude from opposite ends of the main body, respectively. The first tab and the second tab are asymmetrically arranged.

[0079] The first and second pole ears of the battery cell are asymmetrically arranged. Compared with the solution in the prior art in which the two pole ears of the battery cell are symmetrically arranged, the first and second pole ears of the electrode assembly of the battery cell do not have a symmetry axis. The first and second pole ears are subjected to uneven force, the electrode assembly is not easy to rotate, and it is not easy to cause the first and second pole ears to tear, which is beneficial to improving the life of the battery cell.

[0080] The technical solutions described in the embodiments of the present application are applicable to batteries and electrical devices using batteries.

[0081] Electrically powered devices may include vehicles, mobile phones, portable devices, laptop computers, ships, spacecraft, electric toys, and electric tools. Spacecraft include airplanes, rockets, space shuttles, and spacecraft. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Electric tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0082] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle 1000 as an example.

[0083] Please refer to Figure 1, which is a schematic structural diagram of a vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 can be provided at the bottom, head or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000. For example, the battery 100 can serve as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0084] In some embodiments of the present application, the battery 100 can serve not only as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0085] Please refer to Figure 2, which is an exploded view of a battery 100 provided in some embodiments of the present application. The battery 100 includes a housing 10 and a battery cell 20, with the battery cell 20 housed within the housing 10. The housing 10 provides a storage space for the battery cell 20 and can have various structures. In some embodiments, the housing 10 can include a first portion 11 and a second portion 12, which overlap each other and together define a storage space for the battery cell 20. The second portion 12 can be a hollow structure with one end open. The first portion 11 can be a plate-like structure, with the first portion 11 overlapping the open side of the second portion 12, so that the first portion 11 and the second portion 12 together define a storage space. Alternatively, the first portion 11 and the second portion 12 can each be a hollow structure with one end open, with the open side of the first portion 11 overlapping the open side of the second portion 12. Of course, the housing 10 formed by the first portion 11 and the second portion 12 can have various shapes, such as a cylinder, a rectangular parallelepiped, etc.

[0086] In the battery 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 20. The multiple battery cells 20 may be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery cell 20 may be housed within the housing 10. Alternatively, the battery 100 may be constructed by first connecting multiple battery cells 20 in series, in parallel, or in a hybrid connection to form a battery module, which is then connected in series, in parallel, or in a hybrid connection to form a complete battery module, and then housed within the housing 10. The battery 100 may also include other structures, such as a busbar assembly for electrically connecting the multiple battery cells 20.

[0087] Each battery cell 20 may be a secondary battery cell or a primary battery cell; it may also be a lithium-sulfur battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, but is not limited thereto. The battery cell 20 may be cylindrical, flat, rectangular, or in other shapes.

[0088] Please refer to Figures 3, 4, 5 and 6. Figure 3 is a schematic diagram of the structure of the battery cell 20 provided in some embodiments of the present application. Figure 4 is an exploded view of the battery cell 20 provided in some embodiments of the present application. Figure 5 is a schematic diagram of the structure of the electrode assembly provided in some embodiments of the present application. Figure 6 is a schematic diagram of the main view of the electrode assembly 22 provided in some embodiments of the present application. An embodiment of the present application provides a battery cell 20, the battery cell 20 includes a shell 21 and an electrode assembly 22, and the electrode assembly 22 is accommodated in the shell 21. The electrode assembly 22 includes a main body 221, a first pole ear 222 and a second pole ear 223, and the first pole ear 222 and the second pole ear 223 protrude from both ends of the main body 221 respectively. Among them, the first pole ear 222 and the second pole ear 223 are asymmetrically arranged.

[0089] The battery cell 20 refers to the smallest unit constituting the battery 100 .

[0090] The outer shell 21 includes at least one end cap and a housing 211. The housing 211 has a receiving space with at least one end open, and the receiving space is used to receive the electrode assembly 22. The end cap is connected to the housing 211 and closes the opening.

[0091] The end cap refers to a component that covers the opening of the shell 211 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap can be adapted to the shape of the shell 211 to match the shell 211. Optionally, the end cap can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap is not easily deformed when squeezed and collided, so that the battery cell 20 can have a higher structural strength and improved reliability. The material of the end cap can also be a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose special restrictions on this. In some embodiments, the battery cell 20 also includes an insulating member, which is arranged on the inner side of the end cap. The insulating member can be used to isolate the electrical connection components in the shell 211 from the end cap to reduce the risk of short circuit. Exemplarily, the insulating member can be plastic, rubber, etc.

[0092] The housing 211 is a component that cooperates with the end caps to form the internal environment of the battery cell 20. This internal environment can be used to accommodate the electrode assembly 22, electrolyte, and other components. The housing 211 and the end caps can be separate components. An opening can be provided in the housing 211, and the end caps can be closed over the opening to form the internal environment of the battery cell 20. Alternatively, the end caps and housing 211 can be integrated. Specifically, the end caps and housing 211 can form a common joint surface before other components are inserted into the housing. When the interior of the housing 211 needs to be encapsulated, the end caps can be closed over the housing 211. The housing 211 can have a variety of shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the housing 211 can be determined based on the specific shape and size of the electrode assembly 22. The housing 211 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this embodiment of the present application does not impose any particular limitations on this.

[0093] The electrode assembly 22 is a component in the battery cell 20 where electrochemical reactions occur. One or more electrode assemblies 22 may be contained in the housing 21. The electrode assembly 22 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active materials constitute the main body 221 of the electrode assembly 22, and the portions of the positive and negative electrode sheets without active materials each constitute a tab. The positive tab and the negative tab are respectively located at both ends of the main body 221. During the charge and discharge process of the battery 100, the positive electrode active material and the negative electrode active material react with the electrolyte.

[0094] The first electrode tab 222 and the second electrode tab 223 have opposite polarities. When the first electrode tab 222 is the positive electrode tab, the second electrode tab 223 is the negative electrode tab. When the first electrode tab 222 is the negative electrode tab, the second electrode tab 223 is the positive electrode tab. The first electrode tab 222 and the second electrode tab 223 protrude from both ends of the main body 221, that is, the electrode assembly 22 has electrode tabs extending from both ends of the main body 221.

[0095] "The first electrode tab 222 and the second electrode tab 223 are arranged asymmetrically" means that there is no symmetrical plane such that the first electrode tab 222 and the second electrode tab 223 can completely overlap after the electrode assembly 22 is folded along the symmetrical plane. In other words, there is no symmetrical plane such that the first electrode tab 222 and the second electrode tab 223 are mirror-symmetrical about the symmetrical plane. For example, differences in size, shape, etc. between the first electrode tab 222 and the second electrode tab 223 will cause the first electrode tab 222 and the second electrode tab 223 to be asymmetrical. For another example, although the first electrode tab 222 and the second electrode tab 223 have the same size and shape, their positions on the main body 221 do not correspond, which will also cause the first electrode tab 222 and the second electrode tab 223 to be asymmetrical.

[0096] The first pole ear 222 and the second pole ear 223 of the battery cell 20 are asymmetrically arranged. Compared with the solution in the prior art in which the two pole ears of the battery cell 20 are symmetrically arranged, the first pole ear 222 and the second pole ear 223 of the electrode assembly 22 of the battery cell 20 do not have a symmetry axis. The first pole ear 222 and the second pole ear 223 are subjected to uneven force, and the electrode assembly 22 is not easy to rotate, which is not easy to cause the first pole ear 222 and the second pole ear 223 to tear, which is beneficial to improving the life of the battery cell 20.

[0097] Referring to Figures 3, 4, 5, and 6, in some embodiments, the first tab 222 and the second tab 223 protrude from opposite ends of the main body 221 along a first direction. The first tab 222 has a first median cross-section 2221 parallel to the first direction, and the second tab 223 has a second median cross-section 2231 parallel to the first direction. The first median cross-section 2221 and the second median cross-section 2231 are spaced apart along a second direction, which intersects the first direction.

[0098] Along a first direction, the main body 221 has two opposing ends. The first tab 222 protrudes from one end of the main body 221, and the second tab 223 protrudes from the other end of the main body 221. The positions of the first tab 222 and the second tab 223 can be used to determine the ends of the main body 221 and, therefore, the first direction. Referring to Figures 3, 4, 5, and 6, the first direction can be the X direction shown in the figures.

[0099] The second direction intersects the first direction, and the angle between the second direction and the first direction can be an acute angle or a right angle. Referring to Figures 3, 4, 5, and 6, the second direction can be the Y direction shown in the figures, in which case the second direction is perpendicular to the first direction.

[0100] The first middle section 2221 is a virtual plane parallel to the first direction and passing through the center point of the first tab 222. Along the second direction, the maximum distance from the first middle section 2221 to both ends of the first tab 222 is equal. Referring to FIG6 , the dotted line in FIG6 illustrates the location of the first middle section 2221.

[0101] The second middle section 2231 is a virtual plane parallel to the first direction and passing through the center point of the second tab 223. Along the second direction, the maximum distance from the second middle section 2231 to both ends of the second tab 223 is equal. Referring to FIG6 , the position of the second middle section 2231 is indicated by a dotted line.

[0102] The first middle cross-section 2221 and the second middle cross-section 2231 do not overlap. Along the second direction, there is a gap between the first middle cross-section 2221 and the second middle cross-section 2231. In this case, even though the first and second tabs 222 and 223 have the same shape and structure, the first and second tabs 222 and 223 are still asymmetrically arranged because the first and second middle cross-sections 2221 and 223 of the first and second tabs 222 and 223 do not overlap.

[0103] There is a distance between the first middle cross-section 2221 of the first electrode tab 222 and the second middle cross-section 2231 of the second electrode tab 223 along the second direction. The first middle cross-section 2221 and the second middle cross-section 2231 are not in the same plane. Thus, the positions of the first electrode tab 222 and the second electrode tab 223 in the first direction can be staggered. When the battery cell 20 is subjected to vibration, the first electrode tab 222 and the second electrode tab 223 are subjected to different forces. This makes it less likely that the electrode assembly 22 will rotate under the action of external forces, and it is less likely that the first electrode tab 222 and the second electrode tab 223 will tear, thereby improving the lifespan of the battery cell 20. Furthermore, because the first middle cross-section 2221 and the second middle cross-section 2231 are spaced apart along the second direction, the center-to-center distance between the first electrode tab 222 and the second electrode tab 223 is increased, and the heat generated by the first electrode tab 222 and the second electrode tab 223 are less likely to affect each other, thereby improving the lifespan of the battery cell 20.

[0104] Please refer to Figures 7, 8 and 9. Figure 7 is a schematic front view of a battery cell 20 provided in some embodiments of the present application. Figure 8 is a cross-sectional view of the AA position in Figure 7. Figure 9 is a simplified schematic diagram of the welding of the electrode assembly 22 provided in some embodiments of the present application; in some embodiments, the housing 21 includes a first wall portion, and the first wall portion is provided with a liquid injection hole 2121. Along the first direction, the first pole tab 222 is arranged opposite to the first wall portion, and the first pole tab 222 is closer to the first wall portion than the second pole tab 223. The projection of the liquid injection hole 2121 does not overlap with the projection of the first pole tab 222.

[0105] The injection hole 2121 is a through hole for injecting electrolyte into the battery cell 20 .

[0106] The first wall portion is the wall portion of the housing 21 where the injection hole 2121 is provided. For example, when the injection hole 2121 is provided on the side wall of the housing 211, the first wall portion is the side wall of the housing 211. When the injection hole 2121 is provided on the end cap, the first wall portion is the end cap.

[0107] The first wall portion is disposed opposite the first electrode tab 222 along the first direction, and the first electrode tab 222 is closer to the first wall portion than the second electrode tab 223. For example, the housing 21 includes a first end cap 212, a second end cap 213, and a shell 211. The shell 211 has openings at both ends along the first direction, and the first end cap 212 and the second end cap 213 respectively seal the openings at both ends of the shell 211. The first end cap 212 is provided with a liquid injection hole 2121, and the first end cap 212 is the first wall portion. Along the first direction, the first end cap 212 and the second end cap 213 are both disposed opposite the first electrode tab 222, but the first electrode tab 222 is closer to the first end cap 212 than the second electrode tab 223, and the second electrode tab 223 is closer to the second end cap 213 than the first electrode tab 222.

[0108] Along the first direction, the projection of the liquid injection hole 2121 does not overlap with the projection of the first electrode tab 222. At this time, the first electrode tab 222 is located outside the projection of the hole wall of the liquid injection hole 2121.

[0109] By making the projection of the injection hole 2121 non-overlapping with the projection of the first electrode tab 222, the first electrode tab 222 can avoid the injection hole 2121, making it less likely for the first electrode tab 222 and the injection hole 2121 to interfere with each other. During injection, the first electrode tab 222 is less likely to block the injection hole 2121.

[0110] Please refer to Figures 6, 7, 8, 9, and 10. Figure 10 is a schematic top view of an electrode assembly provided in some embodiments of the present application. The main body 221 has a first end surface 2212 at one end along the first direction, and the first electrode tab 222 protrudes from the first end surface 2212. The first end surface 2212 includes a first region 2212a and a second region 2212b. Along the second direction, the first region 2212a and the second region 2212b are respectively located on either side of the first electrode tab 222, and the first region 2212a and the second region 2212b are regions on the first end surface 2212 where no electrode tabs are provided. The maximum length of the first region 2212a is greater than the maximum length of the second region 2212b. Along the first direction, the projection of the injection hole 2121 is located in the first region 2212a.

[0111] The first end surface 2212 is the end surface of the main body 221 where the first tab 222 is disposed. The first end surface 2212 includes a first region 2212a and a second region 2212b. Along the second direction, the first region 2212a and the second region 2212b are respectively located on either side of the first tab 222. In other words, the first tab 222 is located between the first region 2212a and the second region 2212b along the second direction.

[0112] To facilitate illustrating the positions of the first region 2212a and the second region 2212b, please refer to FIG. 10 , in which the first region 2212a is illustrated with a left oblique line, and the second region 2212b is illustrated with a right oblique line.

[0113] The maximum length of the first region 2212a along the second direction is greater than the maximum length of the second region 2212b along the second direction. Along the first direction, the projection of the liquid injection hole 2121 falls within the first region 2212a. Referring to Figure 10, when the electrode assembly 22 is a wound electrode assembly, the maximum length of the first region 2212a along the second direction is the maximum distance from the lower end of the first electrode tab 222 to the bend at the lower end of the main body along the second direction. The maximum length of the second region 2212b along the second direction is the maximum distance from the upper end of the first electrode tab 222 to the bend at the upper end of the main body along the second direction.

[0114] The maximum length of the first region 2212a along the second direction is greater than the maximum length of the second region 2212b along the second direction. Compared with the prior art, the first electrode ear 222 is offset, which not only enables the first electrode ear 222 and the second electrode ear 223 to be asymmetrically arranged, reducing the risk of rotation of the electrode assembly 22, but also avoids the injection hole 2121, reducing the risk of the first electrode ear 222 blocking the injection hole 2121 during injection.

[0115] Please refer to Figure 11, which is a bottom-view schematic diagram of an electrode assembly provided in some embodiments of the present application. In some embodiments, the other end of the main body 221 along the first direction has a second end surface 2213, and the second electrode tab 223 protrudes from the second end surface 2213. The second end surface 2213 includes a third region 2213a and a fourth region 2213b. Along the second direction, the third region 2213a and the fourth region 2213b are respectively located on either side of the second electrode tab 223. The maximum length of the third region 2213a along the second direction is equal to the maximum length of the fourth region 2213b along the second direction.

[0116] Please refer to Figures 6, 7, 8, 10, and 12. Figure 12 is a simplified schematic diagram of the welding of an electrode assembly 22 according to other embodiments of the present application. In other embodiments, the housing 21 includes a first wall portion, which is provided with a pressure relief mechanism 25. Along a first direction, the first electrode tab 222 is disposed opposite the first wall portion, and the first electrode tab 222 is closer to the first wall portion than the second electrode tab 223. The projection of the pressure relief mechanism 25 does not overlap with the projection of the first electrode tab 222.

[0117] The pressure relief mechanism 25 is a component for opening when the internal pressure or temperature of the battery cell 20 reaches an explosion pressure to relieve the internal pressure of the battery cell 20 .

[0118] The first wall portion is the wall portion of the housing 21 where the pressure relief mechanism 25 is provided. For example, when the pressure relief mechanism 25 is provided on the side wall of the housing 211, the first wall portion is the side wall of the housing 211. When the pressure relief mechanism 25 is provided on the end cover, the first wall portion is the end cover.

[0119] The first wall portion is disposed opposite the first pole tab 222 along the first direction, and the first pole tab 222 is closer to the first wall portion than the second pole tab 223. For example, the housing 21 includes a first end cap 212, a second end cap 213, and a shell 211. The shell 211 has openings at both ends along the first direction, and the first end cap 212 and the second end cap 213 respectively seal the openings at both ends of the shell 211. The first end cap 212 is provided with a pressure relief mechanism 25, and the first end cap 212 serves as the first wall portion. Along the first direction, both the first end cap 212 and the second end cap 213 are disposed opposite the first pole tab 222, but the first pole tab 222 is closer to the first end cap 212 than the second pole tab 223, and the second pole tab 223 is closer to the second end cap 213 than the first pole tab 222.

[0120] Along the first direction, the projection of the pressure relief mechanism 25 does not overlap with the projection of the first electrode tab 222 . At this time, the projection of the first electrode tab 222 is completely outside the projection of the pressure relief mechanism 25 .

[0121] By making the projection of the pressure relief mechanism 25 non-overlapping with the projection of the first electrode tab 222 , the first electrode tab 222 can avoid the pressure relief mechanism 25 , making it less likely for the first electrode tab 222 and the pressure relief mechanism 25 to interfere with each other and less likely to affect the pressure relief of the pressure relief mechanism 25 .

[0122] Referring to Figures 6, 7, 8, 10, and 12, in some other embodiments, the main body 221 has a first end surface 2212 at one end along the first direction, and the first tab 222 protrudes from the first end surface 2212. The first end surface 2212 includes a first region 2212a and a second region 2212b. Along the second direction, the first region 2212a and the second region 2212b are located on either side of the first tab 222, respectively. The maximum length of the first region 2212a is greater than the maximum length of the second region 2212b. Along the first direction, the projection of the pressure relief mechanism 25 is located in the first region 2212a.

[0123] The first end surface 2212 is the end surface of the main body 221 where the first tab 222 is disposed. The first end surface 2212 includes a first region 2212a and a second region 2212b. Along the second direction, the first region 2212a and the second region 2212b are respectively located on either side of the first tab 222. In other words, the first tab 222 is located between the first region 2212a and the second region 2212b along the second direction.

[0124] The maximum length of the first region 2212a along the second direction is greater than the maximum length of the second region 2212b along the second direction. Along the first direction, the projection of the pressure relief mechanism 25 falls within the first region 2212a.

[0125] The maximum length of the first region 2212a along the second direction is greater than the maximum length of the second region 2212b along the second direction. Compared with the prior art, the first pole ear 222 is offset, which not only enables the first pole ear 222 and the second pole ear 223 to be asymmetrically arranged, reducing the risk of rotation of the electrode assembly 22, but also avoids the pressure relief mechanism 25, making it less likely for the first pole ear 222 to affect the pressure relief mechanism 25.

[0126] 6 , 7 , 8 , 9 and 10 , in some embodiments, along the second direction, the width of the first electrode tab 222 is smaller than the width of the second electrode tab 223 .

[0127] “Along the second direction, the width of the first electrode tab 222 is smaller than the width of the second electrode tab 223 ” means that along the second direction, the maximum width of the first electrode tab 222 is smaller than the minimum width of the second electrode tab 223 .

[0128] By making the width of the first electrode tab 222 smaller than that of the second electrode tab 223 , the first electrode tab 222 can better avoid the liquid injection hole 2121 or the pressure relief mechanism 25 , and the first electrode tab 222 is less likely to affect the liquid injection of the liquid injection hole 2121 or the pressure relief mechanism 25 .

[0129] 6 , 7 , 8 , 9 and 10 , in some embodiments, along the first direction, the height of the first tab 222 protruding from the main body 221 is greater than the height of the second tab 223 protruding from the main body 221 .

[0130] “Along the first direction, the height of the first tab 222 protruding from the main body 221 is greater than the height of the second tab 223 protruding from the main body 221 ” means that along the first direction, the minimum height of the first tab 222 protruding from the main body 221 is greater than the maximum height of the second tab 223 protruding from the main body 221 .

[0131] It should be noted that when measuring the height of the first tab 222 protruding from the main body 221 along the first direction, if the first tab 222 is in a bent state, it is necessary to straighten the first tab 222 (so that the first tab 222 is parallel to the first direction) before measuring. Similarly, when measuring the height of the second tab 223 protruding from the main body 221 along the first direction, if the second tab 223 is in a bent state, it is necessary to straighten the second tab 223 (so that the second tab 223 is parallel to the first direction) before measuring.

[0132] The width of the first tab 222 is smaller than the width of the second tab 223, which results in a smaller welding area between the first tab 222 and the conductive structure than between the second tab 223 and the corresponding conductive structure. This reduces the flow area between the first tab 222 and the conductive structure. By increasing the height of the first tab 222 protruding from the main body 221 to be greater than the height of the second tab 223 protruding from the main body 221, the welding area between the first tab 222 and the conductive structure is increased, thereby increasing the flow area between the first tab 222 and the conductive structure.

[0133] Referring to Figures 6, 7, 8, 9, and 10, in some embodiments, a battery cell 20 includes a first conductive member 241 and a second conductive member 242. The first tab 222 is welded to the first conductive member 241 to form a first weld mark area, with an area of ​​S1. The second tab 223 is welded to the second conductive member 242 to form a second weld mark area, with an area of ​​S2, satisfying the following: 0.8 ≤ S1 / S2 ≤ 1.2.

[0134] The first conductive member 241 is a conductive component welded to the first tab 222. The first conductive member 241 may be the first end cap 212, the first electrode terminal 231, or the first current collecting member. The connection between the first tab 222 and the first conductive member 241 facilitates the input or output of electrical energy to the battery cell 20.

[0135] The first tab 222 is welded to the first conductive member 241 to form a first weld mark area, where S1 represents the area of ​​the first weld mark area.

[0136] The second conductive member 242 is a conductive component welded to the second tab 223. The second conductive member 242 may be the second end cap 213, the second electrode terminal 232, or the second current collecting member. The connection between the second tab 223 and the second conductive member 242 facilitates the input or output of electrical energy to the battery cell 20.

[0137] The second tab 223 is welded to the second conductive member 242 to form a second weld mark area, where S2 represents the area of ​​the second weld mark area.

[0138] The area ratio of the first weld print area to the second weld print area can be: S1 / S2=0.8, 0.82, 0.85, 0.88, 0.9, 0.92, 0.95, 0.98, 1, 1.02, 1.05, 1.08, 1.1, 1.12, 1.15, 1.18, 1.2, etc.

[0139] The ratio of the area of ​​the first weld print area to the area of ​​the second weld print area is between 0.8 and 1.2, indicating that the area of ​​the first weld print area is approximately equal to the area of ​​the second weld print area. In this way, the flow area at the connection position of the first electrode tab 222 and the first conductive member 241 is approximately the same as the flow area at the connection position of the second electrode tab 223 and the second conductive member 242.

[0140] In some embodiments, 0.9≤S1 / S2≤1.1.

[0141] The area ratio of the first weld print area to the second weld print area can be: S1 / S2=0.9, 0.91, 0.92, 0.93, 0.94, 0.95, 0.96, 0.97, 0.98, 0.99, 1, 1.01, 1.02, 1.03, 1.04, 1.05, 1.06, 1.07, 1.08, 1.09, 1.1, etc.

[0142] The ratio of the area of ​​the first weld print area to the area of ​​the second weld print area is between 0.9 and 1.1, indicating that the area of ​​the first weld print area is closer to the area of ​​the second weld print area. In this way, the flow area of ​​the connection position between the first electrode tab 222 and the first conductive member 241 is roughly the same as the flow area of ​​the connection position between the second electrode tab 223 and the second conductive member 242.

[0143] 6, 7, 8, 9, and 10, in some embodiments, the battery cell 20 includes a first electrode terminal 231 and a first adapter. The first electrode terminal 231 is disposed on the housing 21. The first adapter connects the first electrode terminal 231 and the first tab 222. The first adapter includes a first conductive member 241.

[0144] The first electrode terminal 231 is electrically connected to the first tab 222 via a first adapter to transmit or receive electrical energy from the battery cell 20. The first electrode terminal 231 can be located on the housing 211 or on the end cap. Referring to Figure 9 , the position of the first electrode terminal 231 is indicated by a dashed line in the embodiment shown in Figure 9 . In this embodiment, the first electrode terminal 231 is located on the first end cap 212 .

[0145] The first adapter may be a sheet-like structure, that is, the first adapter may be an adapter sheet.

[0146] In the embodiment shown in Figure 9, the first conductive member 241 is a switching plate. In other embodiments, the first conductive member 241 may also include other conductive structures in addition to the switching plate.

[0147] The first tab 222 is electrically connected to the first electrode terminal 231 via the first adapter. The first adapter and the first tab 222 , and the first adapter and the first electrode terminal 231 can be welded separately, thereby facilitating manufacturing.

[0148] 6 , 7 , 8 , 9 and 10 , in some embodiments, the first weld print area includes a first weld print portion 2411 and a second weld print portion 2412 . Along the second direction, the first weld print portion 2411 and the second weld print portion 2412 are respectively located on both sides of the first electrode terminal 231 .

[0149] The first soldering stamp 2411 and the second soldering stamp 2412 are two parts of the first soldering region, respectively. Along the second direction, the first electrode terminal 231 is located between the first soldering stamp 2411 and the second soldering stamp 2412.

[0150] The area of ​​the first weld print portion 2411 is S3, and the area of ​​the second weld print portion 2412 is S4. Therefore, the area of ​​the first weld print region is S1 = S3 + S4.

[0151] During manufacturing, the first electrode tab 222 and the first conductive member 241 may be welded first, and then the first conductive member 241 and the first electrode terminal 231 may be welded.

[0152] Along the second direction, a first welding stamp 2411 and a second welding stamp 2412 are respectively provided on both sides of the first electrode terminal 231, that is, the first pole ear 222 is welded to the first adapter on both sides of the first electrode terminal 231. In this way, the first pole ear 222 is restricted on both sides of the first electrode terminal 231, so that when the battery cell 20 is vibrated, the first pole ear 222 is not easy to swing, which is beneficial to improving the structural stability of the electrode assembly 22 and increasing the life of the battery cell 20.

[0153] 6 , 7 , 8 , 9 , and 10 , in some embodiments, the battery cell 20 includes a second electrode terminal 232 and a second adapter. The second electrode terminal 232 is disposed on the housing 21 . The second adapter connects the second electrode terminal 232 to the second tab 223 . The second adapter includes a second conductive member 242 .

[0154] The second electrode terminal 232 is electrically connected to the second tab 223 via a second adapter to transmit or receive electrical energy from the battery cell 20. The second electrode terminal 232 can be located on the housing 211 or on the end cap. Referring to Figure 9 , the position of the second electrode terminal 232 is indicated by a dashed line in the embodiment shown in Figure 9 . In this embodiment, the second electrode terminal 232 is located on the second end cap 213 .

[0155] The second adapter may be a sheet-like structure, that is, the second adapter may be an adapter sheet.

[0156] 7 , the second conductive member 242 is a transfer plate. In other embodiments, the second conductive member 242 may include other conductive structures in addition to the transfer plate.

[0157] The second tab 223 is electrically connected to the second electrode terminal 232 via the second adapter. The second adapter and the second tab 223 , and the second adapter and the second electrode terminal 232 can be welded, respectively, to facilitate manufacturing.

[0158] 6 , 7 , 8 , 9 and 10 , in some embodiments, the second weld print area includes a third weld print portion 2421 and a fourth weld print portion 2422 . Along the second direction, the third weld print portion 2421 and the fourth weld print portion 2422 are respectively located on both sides of the second electrode terminal 232 .

[0159] The third soldering stamp 2421 and the fourth soldering stamp 2422 are two parts of the second soldering region, respectively. Along the second direction, the second electrode terminal 232 is located between the third soldering stamp 2421 and the fourth soldering stamp 2422.

[0160] The area of ​​the third weld print portion 2421 is S5, the area of ​​the fourth weld print portion 2422 is S6, and the area of ​​the second weld print region is S2 = S5 + S6.

[0161] During manufacturing, the second electrode tab 223 and the second conductive member 242 may be welded first, and then the second conductive member 242 and the second electrode terminal 232 may be welded.

[0162] Along the second direction, a third weld stamp 2421 and a fourth weld stamp 2422 are respectively provided on both G sides of the second electrode terminal 232, that is, the second pole tab 223 is welded to the second adapter on both sides of the second electrode terminal 232. In this way, the second pole tab 223 is restricted on both sides of the second electrode terminal 232, so that when the battery cell 20 is vibrated, the second pole tab 223 is not easy to swing, which is beneficial to improving the structural stability of the electrode assembly 22 and increasing the life of the battery cell 20.

[0163] In some embodiments, the first electrode tab 222 is a negative electrode tab, and the second electrode tab 223 is a positive electrode tab.

[0164] Generally speaking, the heat generated by the positive electrode tab is higher than the heat generated by the negative electrode tab. In some embodiments of the present application, the width of the negative electrode tab is smaller than the width of the positive electrode tab, and the height of the negative electrode tab protruding from the main body 221 is greater than the height of the positive electrode tab protruding from the main body 221. In comparison, the cross-sectional area of ​​the negative electrode tab along the direction perpendicular to its extension is smaller than the cross-sectional area of ​​the positive electrode tab along the direction perpendicular to its extension, and the flow area of ​​the positive electrode tab is slightly larger than the flow area of ​​the negative electrode tab, thereby reducing the heat generated by the positive electrode tab.

[0165] Please refer to Figures 6, 7, 8, 9, 10, and 13. Figure 13 is a schematic front view of an electrode assembly provided in other embodiments of the present application. In some embodiments, the main body 221 has a third middle section 2211 parallel to the first direction. The third middle section 2211 coincides with the second middle section 2231, and the third middle section 2211 is spaced apart from the first middle section 2221 along the second direction. Alternatively, along the second direction, the first middle section 2221 and the second middle section 2231 are located on either side of the third middle section 2211.

[0166] The third mid-section 2211 is a virtual plane parallel to the first direction and passing through the center point of the main body 221. Along the second direction, the maximum distance from the third mid-section 2211 to the two ends of the main body 221 is equal. Referring to Figures 6, 9, and 12, the location of the third mid-section 2211 is indicated by a dotted line.

[0167] Referring to Figure 9 , third middle section 2211 coincides with the second middle plane, meaning that third middle section 2211 and second middle section 2231 lie in the same plane. Third middle section 2211 and first middle section 2221 do not coincide. Along the second direction, first middle section 2221 and third middle section 2211 are spaced apart. Third middle section 2211 and first middle section 2221 do not lie in the same plane.

[0168] Referring to Figure 13 , the third middle section 2211 and the first middle section 2221 do not overlap. Along the second direction, there is a gap between the first middle section 2221 and the third middle section 2211. The third middle section 2211 and the first middle section 2221 are not in the same plane. The third middle section 2211 and the second middle section 2231 do not overlap. Along the second direction, there is a gap between the second middle section 2231 and the third middle section 2211. The third middle section 2211 and the second middle section 2231 are not in the same plane. Along the second direction, the third middle section 2211 is located between the first middle section 2221 and the second middle section 2231.

[0169] When the third middle cross-section 2211 coincides with the second middle cross-section 2231, and the third middle cross-section 2211 is spaced apart from the first middle cross-section 2221 along the second direction, the first pole tab 222 deviates from the third middle cross-section 2211, thereby increasing the center-to-center distance between the first pole tab 222 and the second pole tab 223. Heat generated by the first pole tab 222 and the second pole tab 223 are less likely to affect each other, which is beneficial for improving the lifespan of the battery cell 20. Along the second direction, when the first middle cross-section 2221 and the second middle cross-section 2231 are located on either side of the third middle cross-section 2211, the first pole tab 222 can deviate upward from the third middle cross-section 2211 along the second direction, and the second pole tab 223 can deviate downward from the third middle cross-section 2211 along the second direction, thereby further increasing the center-to-center distance between the first pole tab 222 and the second pole tab 223. Heat generated by the first pole tab 222 and the second pole tab 223 are less likely to affect each other, which is beneficial for improving the lifespan of the battery cell 20.

[0170] 13 , along the second direction, the distance between the first middle section 2221 and the second middle section 2231 is A, and the maximum dimension of the main body 221 is L, which satisfies the following: 0.05≤A / L≤0.5.

[0171] A represents the distance between the first middle section 2221 and the second middle section 2231 along the second direction. L represents the maximum dimension of the main body 221 along the second direction.

[0172] The ratio of the distance between the first middle section 2221 and the second middle section 2231 along the second direction to the maximum dimension of the main body 221 along the second direction can be: A / L≤0.05, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, etc.

[0173] By making the ratio of the distance between the first middle section 2221 and the second middle section 2231 to the maximum dimension of the main body 221 along the second direction between 0.05 and 0.5, the distance between the first middle section 2221 and the second middle section 2231 is larger, and the first pole tab 222 and the second pole tab 223 are positioned farther apart, which makes it less likely for them to affect each other's heat generation, and is more conducive to improving the service life.

[0174] In some embodiments, 0.1≤A / L≤0.3.

[0175] The ratio of the distance between the first middle section 2221 and the second middle section 2231 along the second direction to the maximum dimension of the main body 221 along the second direction can be: A / L≤0.1, 0.12, 0.15, 0.18, 0.2, 0.22, 0.25, 0.28, 0.3, etc.

[0176] By setting the ratio of the distance between the first middle cross-section 2221 and the second middle cross-section 2231 to the maximum dimension of the main body 221 along the second direction to be between 0.1 and 0.3, the distance between the first middle cross-section 2221 and the second middle cross-section 2231 is increased, and the heat generated by the first and second tabs 222 and 223 is less likely to affect each other, which is beneficial for improving the life of the battery cell 20. Furthermore, the widths of the first and second tabs 222 and 223 can also be set relatively wide, ensuring a certain degree of flow area for the first and second tabs 222 and 223.

[0177] Please refer to Figures 7 and 14. Figure 14 is a schematic front view of a battery cell 20 provided in some embodiments of the present application. In some embodiments, the outer shell 21 is a square shell. The length of the outer shell 21 along the second direction is H, the length of the outer shell 21 along the first direction is B, and the thickness of the outer shell 21 is D, satisfying the following conditions: B / H ≥ 2.4, and H ≥ D. The first direction is the width of the outer shell 21, and the second direction is the height of the outer shell 21.

[0178] Please refer to FIG. 7 and FIG. 14 , the thickness direction of the housing is the Z direction shown in the figures.

[0179] H represents the height of the housing 21, B represents the width of the housing 21, and D represents the thickness of the housing 21. The width of the housing 21 is the largest, and the height of the housing 21 is greater than or equal to the thickness of the housing 21.

[0180] The ratio of the width of the housing 21 to the height of the housing 21 may be: B / H=2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3, etc.

[0181] The aspect ratio of the shell 21 is greater than or equal to 2.4. The internal space of this battery cell 20 is small. The above-mentioned asymmetric pole ear design can not only make the first pole ear 222 and the second pole ear 223 unevenly stressed, but also make the electrode assembly 22 less likely to rotate and less likely to cause the first pole ear 222 and the second pole ear 223 to tear, which is beneficial to improving the life of the battery cell 20 and can also make full use of the internal space of the battery cell 20 to improve the energy density of the battery cell 20.

[0182] Optionally, B / H≥3.

[0183] The ratio of the width of the housing 21 to the height of the housing 21 can be: B / H=3, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4, 4.1, 4.2, 4.3, 4.4, etc.

[0184] The aspect ratio of the shell 21 is greater than or equal to 3, and the internal space of this battery cell 20 is smaller. The above-mentioned asymmetric pole ear design not only makes the first pole ear 222 and the second pole ear 223 unevenly stressed, but also makes the electrode assembly 22 less likely to rotate and less likely to cause the first pole ear 222 and the second pole ear 223 to tear, which is beneficial to improving the life of the battery cell 20 and can also make full use of the internal space of the battery cell 20 and improve the energy density of the battery cell 20.

[0185] In some embodiments, the first tab 222 and the second tab 223 protrude from both ends of the main body 221 along the first direction. The housing 21 includes a shell 211, a first end cap 212, and a second end cap 213. The shell 211 has openings at both ends along the first direction, and the first end cap 212 and the second end cap 213 respectively close the openings at both ends of the shell 211.

[0186] The first end cover 212 and the second end cover 213 respectively close the openings at both ends of the shell 211. The first tab 222 can be electrically connected to the conductive structure on the first end cover 212, and the second tab 223 can be electrically connected to the conductive structure on the second end cover 213, which is simple and convenient to manufacture.

[0187] The embodiment of the present application further provides a battery 100 , which includes the above-mentioned battery cell 20 .

[0188] An embodiment of the present application further provides an electrical device, which includes the above-mentioned battery cell 20 or the above-mentioned battery 100.

[0189] According to some embodiments of the present application, please refer to Figures 1 to 10.

[0190] An embodiment of the present application provides a battery cell 20, comprising a housing 21 and an electrode assembly 22, with the electrode assembly 22 housed within the housing 21. The electrode assembly 22 comprises a main body 221, a first electrode tab 222, and a second electrode tab 223, each protruding from opposite ends of the main body 221. The first electrode tab 222 and the second electrode tab 223 are asymmetrically arranged. Compared to conventional solutions in which the two electrode tabs of a battery cell 20 are symmetrically arranged, the first electrode tab 222 and the second electrode tab 223 of the electrode assembly 22 of the battery cell 20 lack an axis of symmetry. Consequently, the first electrode tab 222 and the second electrode tab 223 are subjected to uneven forces, making the electrode assembly 22 less likely to rotate and less likely to tear the first electrode tab 222 and the second electrode tab 223, thereby improving the lifespan of the battery cell 20.

[0191] The first and second tabs 222 and 223 protrude from opposite ends of the main body 221 along the first direction. The first tab 222 has a first median cross-section 2221 parallel to the first direction, and the second tab 223 has a second median cross-section 2231 parallel to the first direction. The first and second median cross-sections 2221 and 2231 are spaced apart along the second direction, which intersects the first direction. A distance exists between the first and second median cross-sections 2221 and 2231 of the first and second tabs 2231 along the second direction, and the first and second median cross-sections 2221 and 2231 are not located in the same plane. This allows the first and second tabs 222 and 223 to be offset in the first direction. When the battery cell 20 is subjected to vibration, the first and second tabs 222 and 223 are subjected to different forces. This reduces the risk of rotation of the electrode assembly 22 under external forces, and reduces the risk of tearing of the first and second tabs 222 and 223, thereby improving the lifespan of the battery cell 20. In addition, since the first middle section 2221 and the second middle section 2231 are spaced apart along the second direction, the center distance between the first pole tab 222 and the second pole tab 223 is increased, and the heat generated by the first pole tab 222 and the heat generated by the second pole tab 223 are less likely to affect each other, which is beneficial to improving the life of the battery cell 20.

[0192] The housing 21 includes a first wall portion, which is provided with a liquid injection hole 2121 or a pressure relief mechanism 25. A first electrode tab 222 is disposed opposite the first wall portion along a first direction. The first electrode tab is closer to the first wall portion than the second electrode tab 223, and the projection of the liquid injection hole 2121 or the pressure relief mechanism 25 does not overlap with the projection of the first electrode tab 222. By ensuring that the projection of the liquid injection hole 2121 or the pressure relief mechanism 25 does not overlap with the projection of the first electrode tab 222, the first electrode tab 222 can avoid the liquid injection hole 2121 or the pressure relief mechanism 25, thereby reducing the interference between the first electrode tab 222 and the liquid injection hole 2121 or the pressure relief mechanism 25.

[0193] Along the second direction, the width of the first electrode tab 222 is smaller than the width of the second electrode tab 223. Along the first direction, the height of the first electrode tab 222 protruding from the main body 221 is greater than the height of the second electrode tab 223 protruding from the main body 221. By making the width of the first electrode tab 222 smaller than the width of the second electrode tab 223, the first electrode tab 222 can better avoid the liquid injection hole 2121 or the pressure relief mechanism 25, and the first electrode tab 222 is less likely to affect the injection of liquid through the liquid injection hole 2121 or the pressure relief mechanism 25. The smaller width of the first electrode tab 222 than the width of the second electrode tab 223 results in a smaller welding area between the first electrode tab 222 and the conductive structure than between the second electrode tab 223 and the corresponding conductive structure, thereby reducing the flow area at the welding point between the first electrode tab 222 and the conductive structure. By making the height of the first tab 222 protruding from the main body 221 greater than the height of the second tab 223 protruding from the main body 221 , the welding area between the first tab 222 and the conductive structure is increased, thereby increasing the flow area at the welding position between the first tab 222 and the conductive structure.

[0194] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A battery cell, wherein: include: shell; an electrode assembly housed in the housing, the electrode assembly comprising a main body, a first electrode tab and a second electrode tab, wherein the first electrode tab and the second electrode tab protrude from two ends of the main body, respectively; The first electrode tab and the second electrode tab are arranged asymmetrically.

2. The battery cell according to claim 1, wherein: The first electrode tab and the second electrode tab respectively protrude from two ends of the main body along the first direction; The first tab has a first middle section parallel to the first direction, the second tab has a second middle section parallel to the first direction, the first middle section and the second middle section are spaced apart along a second direction intersecting the first direction.

3. The battery cell according to claim 2, wherein: The housing includes a first wall portion, wherein the first wall portion is provided with a liquid injection hole; Along the first direction, the first electrode tab is arranged opposite to the first wall portion, and a projection of the liquid injection hole does not overlap with a projection of the first electrode tab.

4. The battery cell according to claim 3, wherein: One end of the main body along the first direction has a first end surface, the first tab protrudes from the first end surface, and the first end surface includes a first area and a second area; Along the second direction, the first region and the second region are respectively located on both sides of the first tab, and the maximum length of the first region is greater than the maximum length of the second region; Along the first direction, the projection of the liquid injection hole is located in the first area.

5. The battery cell according to any one of claims 2 to 4, wherein: The housing includes a first wall portion, wherein the first wall portion is provided with a pressure relief mechanism; Along the first direction, the first electrode tab is arranged opposite to the first wall portion, and a projection of the pressure relief mechanism does not overlap with a projection of the first electrode tab.

6. The battery cell according to claim 5, wherein: One end of the main body along the first direction has a first end surface, the first tab protrudes from the first end surface, and the first end surface includes a first area and a second area; Along the second direction, the first region and the second region are respectively located on both sides of the first tab, and the maximum length of the first region is greater than the maximum length of the second region; Along the first direction, the projection of the pressure relief mechanism is located in the first area.

7. The battery cell according to any one of claims 3 to 6, wherein: Along the second direction, the width of the first electrode tab is smaller than the width of the second electrode tab.

8. The battery cell according to claim 7, wherein: Along the first direction, a height of the first tab protruding from the main body is greater than a height of the second tab protruding from the main body.

9. The battery cell according to claim 8, wherein: The battery cell includes a first conductive member and a second conductive member. The first electrode tab and the first conductive member are welded to form a first weld print area. The area of ​​the first weld print area is S1. The second electrode tab and the second conductive member are welded to form a second weld print area. The area of ​​the second weld print area is S2. The following conditions are satisfied: 0.8≤S1 / S2≤1.

2.

10. The battery cell according to claim 9, wherein: 0.9≤S1 / S2≤1.

1.

11. The battery cell according to claim 9 or 10, wherein: The battery cell includes a first electrode terminal and a first adapter. The first electrode terminal is provided on the housing. The first adapter connects the first electrode terminal and the first tab. The first adapter includes the first conductive member.

12. The battery cell according to claim 11, wherein: The first weld print area includes a first weld print portion and a second weld print portion. Along the second direction, the first weld print portion and the second weld print portion are respectively located on two sides of the first electrode terminal.

13. The battery cell according to any one of claims 9 to 12, wherein: The battery cell includes a second electrode terminal and a second adapter. The second electrode terminal is provided on the housing. The second adapter connects the second electrode terminal and the second tab. The second adapter includes the second conductive member.

14. The battery cell according to claim 13, wherein: The second weld print area includes a third weld print portion and a fourth weld print portion. Along the second direction, the third weld print portion and the fourth weld print portion are respectively located on two sides of the second electrode terminal.

15. The battery cell according to any one of claims 8 to 14, wherein: The first electrode tab is a negative electrode tab, and the second electrode tab is a positive electrode tab.

16. The battery cell according to any one of claims 2 to 15, wherein: The main body portion has a third mid-section parallel to the first direction; The third middle section coincides with the second middle section, and the third middle section is spaced apart from the first middle section along the second direction; or Along the second direction, the first mid-section and the second mid-section are located on both sides of the third mid-section.

17. The battery cell according to any one of claims 2 to 16, wherein: Along the second direction, a distance between the first middle cross-section and the second middle cross-section is A, and a maximum dimension of the main body is L, satisfying: 0.05≤A / L≤0.

5.

18. The battery cell according to claim 17, wherein: 0.1≤A / L≤0.

3.

19. The battery cell according to any one of claims 2 to 18, wherein: The housing is a square housing, the length of the housing along the second direction is H, the length of the housing along the first direction is B, the thickness of the housing is D, and the following conditions are satisfied: B / H ≥ 2.4, and H ≥ D; The first direction is a width direction of the housing, and the second direction is a height direction of the housing.

20. The battery cell according to claim 19, wherein: B / H≥3.

21. The battery cell according to any one of claims 1 to 20, wherein: The first electrode tab and the second electrode tab respectively protrude from two ends of the main body along the first direction; The housing comprises: A housing, wherein both ends of the housing have openings along the first direction; The first end cover and the second end cover respectively close the openings at both ends of the shell.

22. A battery, wherein: Comprising the battery cell according to any one of claims 1-21.

23. An electrical device, wherein: The method comprises the battery cell according to any one of claims 1 to 21 or the battery according to claim 22.

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