Battery monomer, battery device and electric equipment

Abstract

The utility model relates to a battery monomer, a battery device and electric equipment. The battery monomer comprises a shell and an electrode assembly, and the electrode assembly is arranged in the shell. The electrode assembly comprises a pole piece, the pole piece comprises a first pole piece part, a second pole piece part and a tab, the first pole piece part and the second pole piece part are connected in the first direction, and the tab is arranged on the side, away from the first pole piece part, of the second pole piece part in the first direction. Wherein the minimum size of the first pole piece part along the second direction is greater than the maximum size of the second pole piece part along the second direction. The first direction and the second direction intersect each other. The size of the first pole piece part along the second direction is large, so that the distance between the first pole piece part and the shell along the second direction can be reduced under the condition that the electrode assembly is assembled into the shell, the movement of the pole piece in the shell can be well limited, the probability that the pole piece moves or inclines in the shell is reduced, and the service life of the pole piece is prolonged. And the reliability of the battery monomer can be improved.

Description

Technical Field

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

[0002] Batteries are widely used in electronic devices such as mobile phones and laptops due to their high energy density and environmental friendliness. In recent years, to address environmental issues, gasoline prices, and energy storage challenges, battery applications have rapidly expanded to hybrid vehicles, ships, and energy storage systems.

[0003] In the development of battery technology, how to improve the reliability of individual battery cells is an urgent problem to be solved. Utility Model Content

[0004] Therefore, it is necessary to provide a battery cell, battery device, and electrical equipment that can improve the reliability of the battery cell in order to address the above technical problems.

[0005] According to a first aspect of this application, a battery cell is provided, including a housing and an electrode assembly, the electrode assembly being disposed within the housing. The electrode assembly includes electrode plates, each electrode plate comprising a first electrode plate portion, a second electrode plate portion, and a tab. The first electrode plate portion and the second electrode plate portion are connected along a first direction, and the tab is disposed along the first direction on the side of the second electrode plate portion away from the first electrode plate portion. The minimum dimension of the first electrode plate portion along a second direction is greater than the maximum dimension of the second electrode plate portion along the second direction. The first direction and the second direction intersect each other.

[0006] In the technical solution of this application, on the one hand, since the size of the second electrode portion along the second direction is small and the tab is located on the side of the second electrode portion away from the first electrode portion, the distance between the second electrode portion and the housing along the second direction is large, which facilitates the electrode to be inserted into the housing in the direction from the first electrode portion to the second electrode portion, thereby improving the convenience of inserting the electrode into the housing; on the other hand, since the size of the first electrode portion along the second direction is large, the distance between the first electrode portion and the housing along the second direction can be reduced when the electrode assembly is assembled into the housing, thereby effectively restricting the movement of the electrode within the housing, which helps to reduce the probability of the electrode moving or tilting inside the housing, thereby improving the reliability of the battery cell.

[0007] In one embodiment, the dimension of the second electrode portion near the first electrode portion along the second direction is greater than the dimension of the second electrode portion away from the first electrode portion along the second direction.

[0008] In this way, the distance between the end of the second electrode portion away from the first electrode portion and the housing along the second direction is smaller than the distance between the end of the second electrode portion near the first electrode portion and the housing along the second direction, which makes it easier for the electrode assembly to be assembled into the housing along the direction from the first electrode portion to the second electrode portion.

[0009] In one embodiment, the dimension of the first electrode portion remains constant along the second direction, while the dimension of the second electrode portion gradually decreases along the second direction, pointing from the first electrode portion to the second electrode portion.

[0010] On the one hand, the size of the second electrode portion gradually decreases along the second direction along the first direction, which allows the distance between the electrode assembly and the housing along the second direction to gradually increase, making it easier for the electrode assembly to be assembled into the housing. On the other hand, since the size of the first electrode portion along the second direction remains unchanged along the first direction, it is beneficial to confine the regularly shaped first electrode portion between the two sidewalls of the housing that are opposite to each other along the second direction. This helps to reduce the probability of the electrode moving or tilting inside the housing, thereby reducing the occurrence of electrode damage or tab tearing, and thus improving the reliability of the battery cell.

[0011] In one embodiment, the first electrode portion has two first edges disposed opposite to each other along a second direction, and the second electrode portion has two second edges disposed opposite to each other along a second direction. The first edges are parallel to the first direction, and the longitudinal extension direction of at least one of the second edges is angularly disposed to the first direction and the second direction, respectively. The minimum distance between the ends of the two second edges closer to the first edges is greater than the maximum distance between the ends of the two second edges farther from the first edges.

[0012] Since the first edge is parallel to the first direction, at least one first edge can abut against the housing along the second direction, increasing the contact area between the first electrode portion and the housing. This allows the first electrode portion to be better confined between the two sidewalls of the housing that are opposite each other along the second direction. Furthermore, since the longitudinal extension direction of at least one second edge is angular to both the first and second directions, it facilitates the insertion of the electrode into the housing along the direction from the first electrode portion to the second electrode portion, improving the ease of inserting the electrode assembly into the housing.

[0013] In one embodiment, one second edge is parallel to the first direction, and the longitudinal extension direction of the other second edge is set at an angle to the first direction and the second direction, respectively.

[0014] In this way, the second electrode portion can be roughly in the shape of a right-angled trapezoid, which can improve the manufacturing convenience of the electrode portion and gradually increase the distance between the second electrode portion and the housing along the second direction, thereby improving the ease of housing the electrode assembly.

[0015] In one embodiment, the second edge parallel to the first direction is flush with the adjacent first edge.

[0016] The electrode is positioned so that one side of the second edge and the first edge abuts against the housing in the second direction, which increases the contact area between the electrode and the housing. This improves the stability of the electrode within the housing, reduces the probability of the electrode moving or tilting inside the housing, and reduces the occurrence of electrode damage or tab tearing, thereby improving the reliability of the battery cell.

[0017] In one embodiment, the two second edges are symmetrically arranged with reference to the target plane, which is perpendicular to the second direction.

[0018] It is understandable that the second electrode portion is roughly in the shape of an isosceles trapezoid, which allows the distance between the two opposite sides of the second electrode portion and the housing along the second direction to gradually increase, thereby improving the ease of inserting the electrode assembly into the housing.

[0019] In one embodiment, the two first edges are symmetrically arranged with reference to the target plane.

[0020] In this way, the electrodes can be arranged symmetrically with reference to the target plane, which can improve the regularity and manufacturing convenience of the electrodes. Furthermore, the distance between the two opposite sides of the second electrode portion and the housing along the second direction can gradually increase, thereby improving the ease of housing the electrode assembly.

[0021] In one embodiment, the minimum dimension of the second electrode portion along the second direction is 10mm-500mm, and the maximum dimension of the second electrode portion along the second direction is 11mm-501mm.

[0022] Setting the dimensions of the second electrode portion along the second direction within a suitable range is beneficial for gradually increasing the distance between at least one side of the second electrode portion along the second direction and the housing, thereby improving the ease of housing insertion of the electrode assembly and enhancing the strength and reliability of the electrode.

[0023] In one embodiment, the dimension of the first electrode portion along the first direction is smaller than the dimension of the second electrode portion along the first direction.

[0024] Since the second electrode portion has a larger dimension along the first direction, this facilitates easier installation of the electrode assembly into the housing.

[0025] In one embodiment, the size of the electrode along the first direction is L, the size of the first electrode portion along the first direction is 0.1×L-0.42×L, and the size of the second electrode portion along the first direction is 0.58×L-0.9×L.

[0026] On the one hand, the larger size of the second electrode portion along the first direction, and its placement within a suitable range, can better improve the ease of inserting the electrode assembly into the housing. On the other hand, setting the size of the first electrode portion along the first direction within a suitable range can effectively limit the movement of the electrode within the housing, thereby improving the reliability of the battery cell.

[0027] In one embodiment, along the second direction, the first electrode portion has a first distance between itself and the housing, and the second electrode portion has a second distance between itself and the housing at least one side along the second direction, wherein the first distance is less than the second distance.

[0028] On the one hand, the larger distance between at least one side of the second electrode portion along the second direction and the housing is beneficial to improving the ease of inserting the electrode assembly into the housing. On the other hand, the smaller distance between the first electrode portion and the housing, or even zero distance between the first electrode portion and the housing, can effectively restrict the movement of the electrode within the housing, thereby reducing the probability of the electrode moving or tilting inside the housing, and thus improving the reliability of the battery cell.

[0029] In one embodiment, along the second direction, the first electrode portion of the electrode abuts against the inner wall of the housing, and the second electrode portion of the electrode is spaced apart from the inner wall of the housing.

[0030] In this way, the ease of inserting the electrode assembly into the housing can be improved, and the movement of the electrode in the second direction can be restricted by the two side walls of the housing that are arranged opposite each other in the second direction. This can further reduce the probability of the electrode moving or tilting inside the housing, thereby improving the reliability of the battery cell.

[0031] In one embodiment, the housing has a first sidewall and a second sidewall disposed opposite to each other along a second direction, and a first electrode portion of the electrode is interference-fitted between the first sidewall and the second sidewall of the housing.

[0032] This improves the binding effect of the casing on the first electrode portion of the electrode, thereby reducing the probability of the electrode moving or tilting inside the casing and improving the reliability of the battery cell.

[0033] In one embodiment, the battery cell further includes an electrical separator that covers the outside of the electrode assembly and is disposed within the housing. Along a second direction, the portion of the electrical separator covering the first electrode abuts against the inner wall of the housing, while the portion of the electrical separator covering the second electrode is spaced apart from the inner wall of the housing.

[0034] On the one hand, the portion of the electrical separator covering the first electrode abuts against the inner wall of the housing, effectively restricting the movement of the electrical separator and the electrode along the second direction. This significantly reduces the probability of the electrode moving or tilting inside the housing, thereby improving the reliability of the battery cell. On the other hand, the portion of the electrical separator covering the second electrode is spaced apart from the inner wall of the housing, facilitating the assembly of the electrode assembly into the housing along the direction from the first electrode to the second electrode.

[0035] In one embodiment, the housing has a first sidewall and a second sidewall disposed opposite to each other along a second direction, and the electrical isolation member is partially interference-fitted between the first sidewall and the second sidewall of the housing covering the first electrode portion.

[0036] This improves the binding effect of the casing on the electrical isolation components and the first electrode portion of the electrode, thereby reducing the probability of the electrode moving or tilting inside the casing and improving the reliability of the battery cell.

[0037] In one embodiment, the electrode assembly includes a first electrode, a second electrode, and a separator, wherein the first electrode and the second electrode have opposite polarities, and the separator separates the first electrode and the second electrode. Both the first electrode and the second electrode are electrodes.

[0038] In this way, the electrode assembly consisting of the first electrode, the second electrode, and the separator can be assembled into the housing in the direction from the first electrode portion to the second electrode portion, and can effectively limit the movement of the electrode assembly in the housing in the second direction, thereby greatly reducing the probability of the first electrode and the second electrode moving or tilting inside the housing, and thus improving the reliability of the battery cell.

[0039] According to a second aspect of this application, a battery device is provided, comprising a battery cell of any of the above embodiments.

[0040] According to a third aspect of this application, an electrical device is provided, including the battery device described above.

[0041] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0042] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0043] Figure 1 A schematic diagram of the structure of a vehicle according to an embodiment of this application is shown.

[0044] Figure 2 A schematic diagram of the housing structure according to an embodiment of this application is shown.

[0045] Figure 3 A schematic diagram of the structure of an electrode assembly according to an embodiment of this application is shown.

[0046] Figure 4 A schematic diagram of the structure of the first electrode sheet according to an embodiment of this application is shown.

[0047] Figure 5 A schematic diagram of the structure of the second electrode sheet according to an embodiment of this application is shown.

[0048] Figure 6 A schematic diagram of the structure of an electrode assembly according to another embodiment of this application is shown.

[0049] Figure 7 A schematic diagram of the structure of the first electrode sheet according to another embodiment of this application is shown.

[0050] Figure 8 A schematic diagram of the structure of the second electrode sheet according to another embodiment of this application is shown.

[0051] Reference numerals: 1. Vehicle; 10. Battery assembly; 100. Housing; 101. First sidewall; 102. Second sidewall; R. Receiving cavity; K. Opening; 200. Electrode; 201. First electrode; 202. Second electrode; 210. First electrode portion; 211. First edge; 220. Second electrode portion; 221. Second edge; 230. Tab; 20. Motor; 30. Controller. Detailed Implementation

[0052] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0053] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0054] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0055] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0056] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0057] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0058] Batteries are widely used in electronic devices such as mobile phones and laptops due to their high energy density and environmental friendliness. In recent years, to address environmental issues, gasoline prices, and energy storage challenges, battery applications have rapidly expanded to hybrid vehicles, ships, and energy storage systems.

[0059] In related technologies, the electrodes are usually designed with equal width, and in order to facilitate the insertion of the electrodes into the casing, there is a gap between the electrodes and the casing. This makes it easy for the electrodes to tip over or move inside the casing, which can lead to electrode damage and consequently lower reliability of the battery cell.

[0060] To address the aforementioned technical problems, this application designs a battery cell, a battery device, and an electrical appliance, aiming to reduce the probability of the electrode plates moving or tilting inside the casing, thereby improving the reliability of the battery cell.

[0061] The battery cells and / or battery devices disclosed in this application can be used, but are not limited to, in electrical equipment such as vehicles, ships, or aircraft. These electrical equipment can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, and spacecraft. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft. The power system of this electrical equipment can be composed using the battery cells and / or battery devices disclosed in this application, which facilitates providing power to the equipment and extends its service life.

[0062] Figure 1This illustration shows a structural diagram of a vehicle 1 according to an embodiment of this application. Vehicle 1 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 10 is installed inside vehicle 1. For example, the battery device 10 can be installed at the bottom, front, or rear of vehicle 1. The battery device 10 can be used to power vehicle 1. For example, the battery device 10 can serve as the operating power source for vehicle 1's electrical system, such as meeting the power requirements for starting, navigation, and operation of vehicle 1. In another embodiment of this application, the battery device 10 can not only serve as the operating power source for vehicle 1 but also as the driving power source for vehicle 1, replacing or partially replacing gasoline or natural gas to provide driving force for vehicle 1.

[0063] The interior of vehicle 1 may also be equipped with a motor 20 and a controller 30. The controller 30 is used to control the power supply of the battery device 10 to the motor 20, for example, for the power needs of vehicle 1 during starting, navigation and driving.

[0064] The battery device 10 may include a single battery cell, or it may include multiple battery cells, which are electrically connected in series, parallel, or mixed connection (mixed connection refers to a combination of series and parallel connection).

[0065] Figure 2 A schematic diagram of the housing structure according to an embodiment of this application is shown. Figure 3 A schematic diagram of the structure of an electrode assembly according to an embodiment of this application is shown. Figure 4 and Figure 5 The diagrams show the structural schematics of the first electrode and the second electrode according to an embodiment of this application.

[0066] Please refer to the following: Figures 2-5 One embodiment of this application provides a battery cell, including a housing 100 and an electrode assembly, wherein the electrode assembly is disposed within the housing 100.

[0067] The housing 100 refers to the component on the battery cell used to house the electrode assembly.

[0068] An electrode assembly refers to an assembly located within a housing 100 on a battery cell and containing at least an electrode 200.

[0069] The electrode assembly includes an electrode 200, which includes a first electrode portion 210 and a second electrode portion 220 connected along a first direction F1, and a tab 230. The tab 230 is disposed along the first direction F1 on the side of the second electrode portion 220 away from the first electrode portion 210.

[0070] The first electrode portion 210 and the second electrode portion 220 are two parts of the electrode 200 that are connected along the first direction F1 and coated with an active material layer.

[0071] The tab 230 is the part on the electrode 200 used for electrical connection with the terminal post of the battery cell.

[0072] The minimum dimension of the first electrode portion 210 along the second direction F2 is greater than the maximum dimension of the second electrode portion 220 along the second direction F2, wherein the first direction F1 and the second direction F2 intersect each other.

[0073] The first direction F1 can be perpendicular to the second direction F2. For example, the first direction F1 is parallel to the length direction of the electrode 200, and the second direction F2 is parallel to the width direction of the electrode 200.

[0074] Typically, the electrode assembly is assembled into a housing 100 with equal wall thickness and a generally rectangular structure (e.g., Figure 2 As shown, within the housing 100 along the first direction F1 (where the distance between the two oppositely disposed sidewalls along the second direction F2 remains unchanged), on the one hand, since the size of the second electrode portion 220 along the second direction F2 is small, and the electrode tab 230 is disposed on the side of the second electrode portion 220 away from the first electrode portion 210, during the assembly of the electrode assembly into the housing 100 with equal wall thickness and a generally rectangular structure, since the distance between the second electrode portion 220 of the electrode 200 and the housing 100 along the second direction F2 is large, it is convenient for the electrode 200 to point towards the second electrode along the first electrode portion 210. The orientation of the electrode portion 220 when it is installed into the housing can improve the convenience of installing the electrode assembly into the housing. On the other hand, since the size of the first electrode portion 210 along the second direction F2 is relatively large, when the electrode assembly is installed into the housing, the distance between the first electrode portion 210 and the housing 100 along the second direction F2 can be reduced. This can effectively limit the movement of the electrode 200 within the housing 100, thereby reducing the probability of the electrode 200 moving or tilting inside the housing 100. This can reduce the occurrence of damage to the electrode 200 or tearing of the tab 230, thereby improving the reliability of the battery cell.

[0075] In some embodiments, the dimension of the second electrode portion 220 at the end near the first electrode portion 210 along the second direction F2 is greater than the dimension of the second electrode portion 220 at the end away from the first electrode portion 210 along the second direction F2.

[0076] In this way, the distance between the end of the second electrode portion 220 away from the first electrode portion 210 and the housing 100 along the second direction F2 is smaller than the distance between the end of the second electrode portion 220 near the first electrode portion 210 and the housing 100 along the second direction F2, which makes it easier for the electrode assembly to be assembled into the housing along the direction from the first electrode portion 210 to the second electrode portion 220.

[0077] In some embodiments, the size of the first electrode portion 210 remains constant along the first direction F1 and along the second direction F2. Along the direction from the first electrode portion 210 to the second electrode portion 220, the size of the second electrode portion 220 gradually decreases along the second direction F2.

[0078] On the one hand, the size of the second electrode portion 220 gradually decreases along the first direction F1 and along the second direction F2, which can gradually increase the distance between the electrode assembly and the housing 100 along the second direction F2, making it easier for the electrode assembly to be assembled into the housing. On the other hand, since the size of the first electrode portion 210 remains unchanged along the first direction F1 and along the second direction F2, it is beneficial to confine the regularly shaped first electrode portion 210 between the two side walls of the housing 100 that are opposite to each other along the second direction F2. This helps to reduce the probability of the electrode 200 moving or tilting inside the housing 100, thereby reducing the occurrence of damage to the electrode 200 or tearing of the tab 230, and thus improving the reliability of the battery cell.

[0079] In some embodiments, the first electrode portion 210 has two first edges 211 disposed opposite to each other along the second direction F2, and the second electrode portion 220 has two second edges 221 disposed opposite to each other along the second direction F2. The first edges 211 are parallel to the first direction F1, and the longitudinal extension direction of at least one of the second edges 221 is angularly disposed to the first direction F1 and the second direction F2, respectively. The minimum distance between the ends of the two second edges 221 closest to the first edges 211 is greater than the maximum distance between the ends of the two second edges 221 furthest from the first edges 211.

[0080] The first edge 211 refers to the edge of the first electrode portion 210 along the second direction F2.

[0081] The second edge 221 refers to the edge of the second electrode portion 220 along the second direction F2.

[0082] Since the first edge 211 is parallel to the first direction F1, at least one first edge 211 can abut against the housing 100 along the second direction F2, increasing the contact area between the first electrode portion 210 and the housing 100. This allows the first electrode portion 210 to be better confined between the two sidewalls of the housing 100 that are opposite each other along the second direction F2. Furthermore, since the longitudinal extension direction of at least one second edge 221 is angular to the first direction F1 and the second direction F2, it is advantageous for the electrode 200 to be inserted into the housing along the direction from the first electrode portion 210 to the second electrode portion 220, improving the ease of housing insertion for the electrode assembly.

[0083] In some embodiments, please refer to Figures 6-8One of the second edges 221 is parallel to the first direction F1, and the longitudinal extension direction of the other second edge 221 is set at an angle to the first direction F1 and the second direction F2 respectively.

[0084] In this way, the second electrode portion 220 can be roughly in the shape of a right trapezoid, which can improve the manufacturing convenience of the electrode 200 and gradually increase the distance between the second electrode portion 220 and the housing 100 along the second direction F2, thereby improving the ease of housing the electrode assembly.

[0085] In some embodiments, the second edge 221 parallel to the first direction F1 is flush with the adjacent first edge 211.

[0086] The electrode 200 is positioned so that one side of the second edge 221 and the first edge 211 abuts against the housing 100 along the second direction F2, thereby increasing the contact area between the electrode 200 and the housing 100. This improves the stability of the electrode 200 within the housing 100, reduces the probability of the electrode 200 moving or tilting within the housing 100, and reduces the occurrence of damage to the electrode 200 or tearing of the tab 230, thereby improving the reliability of the battery cell.

[0087] In other embodiments, please refer to [reference needed]. Figures 3-5 The two second edges 221 are symmetrically set with the target plane as the reference object, and the target plane is perpendicular to the second direction F2.

[0088] It is understood that the longitudinal extension directions of the two second edges 221 are set at angles to the first direction F1 and the second direction F2, respectively. The second electrode portion 220 is approximately an isosceles trapezoidal structure, which makes the distance between the two opposite sides of the second electrode portion 220 along the second direction F2 and the housing 100 along the second direction F2 gradually increase, thereby improving the convenience of inserting the electrode assembly into the housing.

[0089] Specifically, such as Figures 3-5 In the embodiment shown, the two first edges 211 are symmetrically arranged with reference to the target plane.

[0090] In this way, the electrode 200 can be symmetrically arranged with reference to the target plane, which can improve the regularity and manufacturing convenience of the electrode 200. Furthermore, the distance between the two opposite sides of the second electrode portion 220 and the housing 100 along the second direction F2 can gradually increase, thereby improving the ease of housing the electrode assembly.

[0091] In some embodiments, the minimum dimension of the second electrode portion 220 along the second direction F2 is 10mm-500mm, and the maximum dimension of the second electrode portion 220 along the second direction F2 is 11mm-501mm.

[0092] The dimension of the second electrode portion 220 along the second direction F2 is the width of the second electrode portion 220. Therefore, the minimum width of the second electrode portion 220 is 10mm-500mm, and the maximum width of the second electrode portion 220 is 11mm-501mm.

[0093] For example, the minimum width of the second electrode portion 220 is 10mm, 100mm, 200mm, 300mm, 400mm or 500mm.

[0094] For example, the maximum width of the second electrode portion 220 is 11 mm, 101 mm, 201 mm, 301 mm, 401 mm or 501 mm.

[0095] Setting the size of the second electrode portion 220 along the second direction F2 within a suitable range is beneficial for the distance between at least one side of the second electrode portion 220 along the second direction F2 and the housing 100 along the second direction F2 to gradually increase, thereby improving the ease of housing the electrode assembly and improving the strength and reliability of the electrode 200.

[0096] In some embodiments, the size of the first electrode portion 210 along the first direction F1 is smaller than the size of the second electrode portion 220 along the first direction F1.

[0097] Since the second electrode portion 220 has a larger size along the first direction F1, it is beneficial to improve the ease of housing the electrode assembly.

[0098] In some embodiments, the size of the electrode 200 along the first direction F1 is L, the size of the first electrode portion 210 along the first direction F1 is 0.1×L-0.42×L, and the size of the second electrode portion 220 along the first direction F1 is 0.58×L-0.9×L.

[0099] For example, the first electrode portion 210 has a dimension of 0.1×L, 0.2×L, 0.3×L, or 0.42×L along the first direction F1. The second electrode portion 220 has a dimension of 0.9×L, 0.8×L, 0.7×L, or 0.58×L along the first direction F1.

[0100] On the one hand, the second electrode portion 220 has a larger size along the first direction F1 and is positioned within a suitable range, which can better improve the ease of inserting the electrode assembly into the housing. On the other hand, by setting the size of the first electrode portion 210 along the first direction F1 within a suitable range, the movement of the electrode 200 within the housing 100 can be effectively restricted, thereby improving the reliability of the battery cell.

[0101] In some embodiments, along the second direction F2, the first electrode portion 210 has a first distance between itself and the housing 100, and the second electrode portion 220 has a second distance between itself and at least one side of the housing 100 along the second direction F2, wherein the first distance is less than the second distance.

[0102] It can be, such as Figures 6-8 In the embodiment shown, the second electrode portion 220 has a second distance between its side along the second direction F2 and the housing 100; alternatively, as shown... Figures 3-5 In the embodiment shown, the second electrode portion 220 has a second distance between its opposite sides along the second direction F2 and the housing 100.

[0103] On the one hand, the relatively large distance between at least one side of the second electrode portion 220 along the second direction F2 and the housing 100 is beneficial to improving the ease of inserting the electrode assembly into the housing. On the other hand, the relatively small distance between the first electrode portion 210 and the housing 100, or even zero distance between the first electrode portion 210 and the housing 100, can effectively limit the movement of the electrode 200 within the housing 100, thereby reducing the probability of the electrode 200 moving or tilting within the housing 100, and thus improving the reliability of the battery cell.

[0104] In some embodiments, along the second direction F2, the first electrode portion 210 of the electrode 200 abuts against the inner wall of the housing 100, and the second electrode portion 220 of the electrode 200 is spaced apart from the inner wall of the housing 100.

[0105] In this way, the convenience of inserting the electrode assembly into the housing can be improved, and the movement of the electrode 200 along the second direction F2 can be restricted by the two side walls of the housing 100 that are opposite each other along the second direction F2. This can further reduce the probability of the electrode 200 moving or tilting inside the housing 100, thereby improving the reliability of the battery cell.

[0106] In some embodiments, the housing 100 has a first sidewall 101 and a second sidewall 102 disposed opposite to each other along the second direction F2, and the first electrode portion 210 of the electrode 200 is interference-fitted between the first sidewall 101 and the second sidewall 102 of the housing 100.

[0107] In this way, the binding effect of the housing 100 on the first electrode portion 210 of the electrode 200 can be improved, thereby reducing the probability of the electrode 200 moving or tilting inside the housing 100, and thus improving the reliability of the battery cell.

[0108] In other embodiments, the battery cell further includes an electrical separator (not shown in the figure), which covers the outside of the electrode assembly and is disposed within the housing 100 to electrically isolate the electrode assembly from the housing 100. Along the second direction F2, the portion of the electrical separator covering the first electrode portion 210 abuts against the inner wall of the housing 100, and the portion of the electrical separator covering the second electrode portion 220 is spaced apart from the inner wall of the housing 100.

[0109] Electrically isolated components refer to the parts on a battery cell used to electrically isolate the electrode assembly from the housing 100.

[0110] It is understandable that the electrical isolation component is designed to conform to the shape of the electrode 200, meaning that the shape of the electrical isolation component after being covered is roughly similar to that of the electrode 200.

[0111] On the one hand, the portion of the electrical separator covering the first electrode portion 210 abuts against the inner wall of the housing 100, which effectively restricts the movement of the electrical separator and the electrode 200 along the second direction F2, thereby significantly reducing the probability of the electrode 200 moving or tilting inside the housing 100 and improving the reliability of the battery cell. On the other hand, the portion of the electrical separator covering the second electrode portion 220 is spaced apart from the inner wall of the housing 100, facilitating the assembly of the electrode assembly into the housing along the direction from the first electrode portion 210 to the second electrode portion 220.

[0112] In other embodiments, the housing 100 has a first sidewall 101 and a second sidewall 102 disposed opposite to each other along the second direction F2, and the electrical isolation member is partially interference-fitted over the first electrode portion 210 and disposed between the first sidewall 101 and the second sidewall 102 of the housing 100.

[0113] In this way, the binding effect of the housing 100 on the electrical separator and the first electrode portion 210 of the electrode 200 can be improved, thereby reducing the probability of the electrode 200 moving or tilting inside the housing 100, and thus improving the reliability of the battery cell.

[0114] In some embodiments, the electrode assembly includes a first electrode 201, a second electrode 202, and a separator (not shown in the figure), wherein the first electrode 201 and the second electrode 202 have opposite polarities, and the separator is used to separate the first electrode 201 and the second electrode 202, wherein both the first electrode 201 and the second electrode 202 are electrode 200.

[0115] The separator refers to the component on the electrode assembly used to separate the first electrode 201 and the second electrode 202. The separator can be a separator membrane.

[0116] The shape of the separator can be the same as that of the first electrode 201 or the second electrode 202; or the shape of the separator can be different from that of the first electrode 201 or the second electrode 202, as long as it can separate the first electrode 201 and the second electrode 202.

[0117] It is possible that one of the first electrode 201 and the second electrode 202 is a positive electrode, and the other of the first electrode 201 and the second electrode 202 is a negative electrode.

[0118] Alternatively, the first electrode 201, the separator, and the second electrode 202 may be stacked within the housing 100 along the thickness direction of the first electrode 201 or the second electrode 202.

[0119] In this way, the electrode assembly consisting of the first electrode 201, the second electrode 202 and the separator can be assembled into the housing along the direction from the first electrode portion 210 to the second electrode portion 220, and can effectively limit the movement of the electrode assembly in the housing 100 along the second direction F2, thereby greatly reducing the probability of the first electrode 201 and the second electrode 202 moving or tilting inside the housing 100, and thus improving the reliability of the battery cell.

[0120] In some embodiments, the housing 100 has a receiving cavity R for accommodating an electrode assembly, and the housing 100 is provided with an opening K communicating with the receiving cavity R. The opening K is provided at least on the side of the housing 100 along the first direction F1 that is closer to the first electrode portion 210 than the second electrode portion 220.

[0121] Alternatively, the housing 100 may have an opening K on the side of the first electrode portion 210 that is closer to the second electrode portion 220 than the second electrode portion 220 along the first direction F1. Or, the housing 100 may have one opening K on the side of the first direction F1 that is closer to the first electrode portion 210 than the second electrode portion 220, and another opening K on the other side of the housing 100 along the first direction F1.

[0122] Since the opening K is provided at least on the side of the housing 100 that is closer to the first electrode portion 210 than the second electrode portion 220 along the first direction F1, it is advantageous for the electrode assembly to be assembled into the housing through the opening K in the direction from the first electrode portion 210 to the second electrode portion 220.

[0123] In some embodiments, the battery cell further includes a first cover (not shown) and a second cover (not shown), the first cover and the second cover being connected to opposite sides of the housing 100 along the first direction F1, and respectively used to close two openings K.

[0124] In this way, after the electrode assembly is installed into the shell, the two openings K can be closed by the first cover and the second cover, which can better protect the electrode assembly and prevent water or dust from the external environment from entering the receiving cavity R.

[0125] In some embodiments, along the second direction F2, the first electrode portion 210 has a first distance between itself and the housing 100, and the second electrode portion 220 has a second distance between itself and at least one side of the housing 100 along the second direction F2, wherein the first distance is less than the second distance.

[0126] On the one hand, the relatively large distance between at least one side of the second electrode portion 220 along the second direction F2 and the housing 100 is beneficial to improving the ease of inserting the electrode assembly into the housing. On the other hand, the relatively small distance between the first electrode portion 210 and the housing 100, or even zero distance between the first electrode portion 210 and the housing 100, can effectively limit the movement of the electrode 200 within the housing 100, thereby reducing the probability of the electrode 200 moving or tilting within the housing 100, and thus improving the reliability of the battery cell.

[0127] One embodiment of this application provides a battery device 10, including a battery cell from any of the above embodiments.

[0128] One embodiment of this application provides an electrical device including the battery device 10 described above.

[0129] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0130] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A battery cell, characterized by, The shell (100) comprises: An electrode assembly arranged in the shell (100); wherein the electrode assembly comprises a tab (200), the tab (200) comprising: A first tab portion (210) and a second tab portion (220) connected along a first direction; and A tab (230) arranged on a side of the second tab portion (220) away from the first tab portion (210) along the first direction; The minimum size of the first tab portion (210) along a second direction is greater than the maximum size of the second tab portion (220) along the second direction; The first direction and the second direction intersect each other. The size of the second tab portion (220) along the second direction at the end close to the first tab portion (210) is greater than the size of the second tab portion (220) along the second direction at the end away from the first tab portion (210). The size of the first tab portion (210) along the second direction remains unchanged along the first direction. The size of the second tab portion (220) along the second direction gradually decreases along the direction of the first tab portion (210) pointing to the second tab portion (220).

2. The battery cell of claim 1, wherein, The first tab portion (210) has two first edges (211) oppositely arranged along the second direction; 3. The battery cell of claim 1, wherein, The second tab portion (220) has two second edges (221) oppositely arranged along the second direction; The longitudinal extension direction of at least one of the second edges (221) is arranged at an angle with respect to the first direction and the second direction, respectively; 4. The battery cell of claim 1, wherein, The minimum distance between the two ends of the second edges (221) close to the first edges (211) is greater than the maximum distance between the two ends of the second edges (221) away from the first edges (211). One of the second edges (221) is parallel to the first direction, and the longitudinal extension direction of the other second edge (221) is arranged at an angle with respect to the first direction and the second direction, respectively. The second edge (221) parallel to the first direction is flush with the adjacent first edge (211). The two second edges (221) are symmetrically arranged with respect to the target plane as a reference object.

5. The battery cell of claim 4, wherein, The target plane is perpendicular to the second direction.

6. The battery cell of claim 5, wherein, The two first edges (211) are symmetrically arranged with respect to the target plane as a reference object.

7. The battery cell of claim 4, wherein, The minimum size of the second tab portion (220) along the second direction is 10mm-500mm, and the maximum size of the second tab portion (220) along the second direction is 11mm-501mm. The size of the first tab portion (210) along the first direction is less than the size of the second tab portion (220) along the first direction.

8. The battery cell of claim 7, wherein, The size of the tab (200) along the first direction is L; 9. The battery cell of any one of claims 1-8, wherein, The size of the first tab portion (210) along the first direction is 0.1×L-0.42×L; 10. The battery cell of any one of claims 1-8, wherein, The size of the second tab portion (220) along the first direction is 0.58×L-0.9×L.

11. The battery cell of claim 10, wherein, ​ ​ ​ 12. The battery cell of any one of claims 1-8, wherein, In the second direction, the first tab portion (210) has a first distance to the housing (100), and the second tab portion (220) has a second distance to the housing (100) on at least one side of the second direction; The first distance is less than the second distance.

13. The battery cell of any one of claims 1-8, wherein, In the second direction, a first tab portion (210) of the tab (200) abuts an inner wall of the housing (100), and a second tab portion (220) of the tab (200) is spaced apart from the inner wall of the housing (100).

14. The battery cell of claim 13, wherein, The housing (100) has a first side wall (101) and a second side wall (102) oppositely arranged in the second direction; The first tab portion (210) of the tab (200) is arranged in interference fit between the first side wall (101) and the second side wall (102) of the housing (100).

15. The battery cell of any one of claims 1-8, wherein, The battery cell further comprises an electrical isolation member; The electrical isolation member is wrapped on an outer side of the electrode assembly and arranged in the housing (100); In the second direction, a portion of the electrical isolation member wrapped on the first tab portion (210) abuts an inner wall of the housing (100), and a portion of the electrical isolation member wrapped on the second tab portion (220) is spaced apart from the inner wall of the housing (100).

16. The battery cell of claim 15, wherein, The housing (100) has a first side wall (101) and a second side wall (102) oppositely arranged in the second direction; The portion of the electrical isolation member wrapped on the first tab portion (210) is arranged in interference fit between the first side wall (101) and the second side wall (102) of the housing (100).

17. The battery cell of any one of claims 1-8, wherein, The electrode assembly comprises: a first tab (201) and a second tab (202), the first tab (201) and the second tab (202) having opposite polarities; and an isolation member for separating the first tab (201) and the second tab (202); The first tab (201) and the second tab (202) are both the tab (200).

18. A battery device, characterized by A battery cell as claimed in any one of claims 1-17.

19. An electrical device, comprising: A battery device as claimed in claim 18.

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