Battery cell, battery unit, battery pack, and electric device

Abstract

A battery cell, a battery unit, a battery pack, and an electric device, relating to the technical field of batteries. The battery cell comprises a casing assembly (1), a bare cell (2), and poles (3). The bare cell (2) is arranged inside the casing assembly (1). The poles (3) are arranged on the casing assembly (1). The poles (3) are electrically connected to tabs (20) of the bare cell (2). Each pole (3) comprises a first connecting part (30) and a second connecting part (31) which are connected to each other. When projected along an arrangement direction of the bare cell (2) and the poles (3), the projection area of the first connecting part (30) and the projection area of the second connecting part (31) do not overlap. The first connecting part (30) is welded to the corresponding tab (20) of the bare cell (2). The second connecting part (31) is welded to a busbar. The technical solution can increase the space utilization rate of a battery cell and improves the energy density of the battery cell.

Description

Battery monomer, battery unit, battery pack and power-consuming device

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This disclosure is based on Chinese patent application number 202410268794.3, application date March 8, 2024, and invention name “A battery monomer, battery unit, battery pack and electrical device”, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby introduced into the present disclosure as a reference. Technical Field

[0003] The present disclosure relates to the field of battery technology, and in particular to battery cells, battery units, battery packs, and electrical devices. Background Art

[0004] New energy batteries are being used more and more widely in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are also being increasingly used in energy storage fields.

[0005] In the related art, the space utilization rate of battery cells is low.

[0006] Summary of the Invention

[0007] In order to solve the above technical problems, the present disclosure provides a battery cell, a battery unit, a battery pack and an electric device to increase the space utilization of the battery cell.

[0008] The present disclosure is achieved through the following technical solutions.

[0009] A first aspect of an embodiment of the present disclosure provides a battery cell, including:

[0010] Housing assembly;

[0011] A bare battery cell is disposed inside the housing assembly;

[0012] A pole is arranged on the shell assembly, and the pole is electrically connected to the pole ear of the bare battery cell. The number of the poles is at least two, at least one pole is electrically connected to the positive pole ear of the bare battery cell, and at least one pole is electrically connected to the negative pole ear of the bare battery cell. The pole includes a first connecting part and a second connecting part that are connected to each other. When projected along the arrangement direction of the bare battery cell and the pole, the projection area of ​​the first connecting part and the projection area of ​​the second connecting part do not overlap with each other. The first connecting part is welded to the pole ear of the bare battery cell, and the second connecting part is used to be welded to the bar.

[0013] In the solution of the embodiment of the present disclosure, the pole is arranged in the housing assembly, the first connection portion of the pole is welded to the tab of the bare cell, and the second connection portion is used to be welded to the tab. Projected along the arrangement direction of the bare cell and the pole, the projection area of ​​the first connection portion and the projection area of ​​the second connection portion do not overlap with each other. The first connection portion and the second connection portion need to be welded to the tab and the tab. Arranging the first connection portion and the second connection portion side by side can reduce the overall height of the pole in the battery cell, so that when the height of the battery cell is constant, the height of the bare cell can be as large as possible, thereby increasing the space utilization of the battery cell and improving the energy density of the battery cell.

[0014] In one embodiment, at least one of the poles is a composite pole, the first connecting portion and the second connecting portion of the composite pole are made of different materials, and the pole tab welded to the first connecting portion is made of the same material as the first connecting portion.

[0015] In the embodiment of the present disclosure, the material of the tab welded to the first connecting portion is the same as that of the first connecting portion, and the convection capacity between the first connecting portion and the corresponding tab is good. The material of the positive tab of the bare battery cell is different from that of the negative tab. After the tab is welded to the second connecting portion, it needs to be welded to the corresponding tab of another battery cell. Correspondingly, the materials of the first connecting portion and the second connecting portion are different. Furthermore, the composite material pole can combine the advantages of multiple materials to increase the pole's current capacity and corrosion resistance.

[0016] In one embodiment, the first connecting portion of the composite pole is made of copper, and the second connecting portion of the composite pole is made of aluminum.

[0017] In the embodiments of the present disclosure, the first connecting portion is made of copper, and the second connecting portion is made of aluminum. The copper-aluminum composite terminal has excellent corrosion resistance and maintains good stability under various environmental conditions. Furthermore, the copper-aluminum composite terminal also has good wear resistance, which allows it to withstand stress during battery operation and is less susceptible to damage.

[0018] In one embodiment, the thickness of the first connecting portion ranges from 0.5 mm to 5 mm.

[0019] In the solution of the embodiment of the present disclosure, the thickness of the first connecting portion can be within a relatively appropriate range to ensure a high welding strength between the first connecting portion and the tab and to minimize the thickness of the pole, thereby maximizing the energy density of the battery cell.

[0020] In one embodiment, the thickness of the second connecting portion ranges from 1.5 mm to 5 mm.

[0021] In the embodiment of the present disclosure, the thickness of the second connecting portion is within a relatively suitable range to ensure both a high welding strength between the second connecting portion and the tab and to minimize the thickness of the pole, thereby maximizing the energy density of the battery cell.

[0022] In one embodiment, the thickness of the first connecting portion is equal to the thickness of the second connecting portion.

[0023] In the embodiment of the present disclosure, the thickness of the first connecting portion is equal to the thickness of the second connecting portion, which reduces the difficulty of positioning the first connecting portion and the second connecting portion during the connection process, thereby making the pole easier to process.

[0024] In one embodiment, the pole for electrically connecting to the positive electrode tab of the bare battery cell and the pole for electrically connecting to the negative electrode tab of the bare battery cell are arranged at intervals along a preset direction, the arrangement direction of the pole and the bare battery cell is arranged crosswise to the preset direction, and the first connecting portion and the second connecting portion are arranged along the preset direction.

[0025] In the embodiment of the present disclosure, the first connection part and the second connection part are arranged along a preset direction, and the shell assembly can have a larger space to arrange the first connection part and the second connection part. The dimensions of the first connection part and the second connection part along the preset direction can be made larger, thereby reducing the difficulty of positioning the first connection part and the second connection part during the welding process, thereby making it more difficult to manufacture the battery cell.

[0026] In one embodiment, along the preset direction, a size of the second connecting portion is greater than or equal to a size of the first connecting portion.

[0027] In the embodiment of the present disclosure, during the welding process of the pole and the tab, the positioning difficulty is greater than that of the welding of the pole and the tab. The size of the second connecting part is greater than or equal to the size of the first connecting part, which can alleviate the situation where the tab needs to be positioned for a long time during the welding process of the second connecting part and the tab, thereby speeding up the welding efficiency.

[0028] A second aspect of the present disclosure provides a battery cell, comprising:

[0029] At least two battery cells described in any one of the above;

[0030] One or at least two tabs, each tab being electrically connected to a corresponding pole of one of the battery cells and the second connecting portion of a corresponding other battery cell.

[0031] In one embodiment, the material of the tab is the same as that of the second connecting portion.

[0032] In the embodiment of the present disclosure, the material of the bar piece is the same as that of the second connecting portion, and the convection capacity between the bar piece and the second connecting portion is better.

[0033] A third aspect of the present disclosure provides a battery pack, comprising:

[0034] Install the shell;

[0035] Any of the above battery cells is arranged inside the mounting shell

[0036] A fourth aspect of the embodiments of the present disclosure provides an electrical device, including:

[0037] Device body;

[0038] The battery pack described in any of the above items is used to supply power to the device body.

[0039] Effects of the invention:

[0040] The pole of the embodiment of the present disclosure is set in the housing assembly, the first connection part of the pole is welded to the tab of the bare cell, and the second connection part is used to weld to the tab. Projected along the arrangement direction of the bare cell and the pole, the projection area of ​​the first connection part and the projection area of ​​the second connection part do not overlap with each other. The first connection part and the second connection part need to be welded to the tab and the tab. The first connection part and the second connection part are arranged side by side, which can reduce the overall height of the pole in the battery cell. Therefore, when the height of the battery cell is constant, the height of the bare cell can be as large as possible, thereby increasing the space utilization of the battery cell and improving the energy density of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present disclosure. The same reference numerals are used throughout the drawings to denote the same components. In the drawings:

[0042] FIG1 is an exploded view of a battery cell according to an embodiment of the present disclosure;

[0043] FIG2 is a schematic diagram of the assembly of the housing assembly and the pole according to an embodiment of the present disclosure;

[0044] FIG3 is a schematic structural diagram of a battery unit according to an embodiment of the present disclosure;

[0045] FIG4 is a partial enlarged view of position A in FIG3 .

[0046] Description of the accompanying drawings: 1. shell assembly; 2. bare cell; 20. tab; 3. pole; 3a. preset direction; 3b. thickness direction; 30. first connecting portion; 31. second connecting portion. DETAILED DESCRIPTION

[0047] The following embodiments of the technical solution of the present disclosure are described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present disclosure and are therefore only examples and are not intended to limit the scope of protection of the present disclosure.

[0048] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present disclosure belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure; the terms "including" and "having" and any variations thereof in the specification and claims of the present disclosure and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0049] In the description of the embodiments of this disclosure, technical terms such as "first," "second," and "third" are used solely to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the quantity, specific order, or primary-secondary relationship of the technical features indicated. In the description of the embodiments of this disclosure, "plurality" means more than two, unless otherwise specifically defined.

[0050] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present disclosure. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0051] In the description of the embodiments of the present disclosure, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0052] In the description of the embodiments of the present disclosure, the orientations or positional relationships indicated by technical terms such as "top", "bottom", "upper", and "lower" are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they cannot be understood as limitations on the embodiments of the present disclosure.

[0053] In the description of the embodiments of the present disclosure, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and can refer to internal connectivity between two components or interaction between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present disclosure based on specific circumstances.

[0054] In the description of the embodiments of the present disclosure, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and can be direct contact, contact through an intermediate medium layer, contact with essentially no interaction force between the two contacting parties, or contact with interaction force between the two contacting parties.

[0055] Currently, new energy batteries are increasingly being used in daily life and industry. They are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields.

[0056] In the related art, the pole is provided with a first connection portion for welding to the tab and a second connection portion for welding to the tab. During the welding process, both the first connection portion and the second connection portion will form a molten pool of a certain thickness. In the related art, the first connection portion and the second connection portion are arranged along the thickness direction of the pole, resulting in a large dimension of the pole in the thickness direction, so that it occupies a portion of the volume of the bare cell. As a result, the space utilization rate of the battery cell is low, and the small volume of the bare cell results in a low energy density of the battery cell.

[0057] The present disclosure arranges the first connecting portion 30 and the second connecting portion 31 side by side to reduce the occupancy of the pole 3 in the thickness direction 3b of the pole 3, thereby making the volume of the bare battery cell 2 as large as possible, increasing the space utilization of the battery cell, and improving the energy density of the battery cell.

[0058] The solutions of the embodiments of the present disclosure may be applied to, but not limited to, a battery pack including battery cells or battery units, and may also be applied to an electrical device including a battery cell and a battery pack.

[0059] The present disclosure provides an electric device, which includes a device body and a battery pack, wherein the battery pack is used to supply power to the device body.

[0060] An electrical device is a device that uses electricity as an energy source and consumes it to achieve its corresponding function. For example, an electrical device may include, but is not limited to, a mobile phone, tablet computer, laptop computer, electric toy, power tool, battery-powered vehicle, electric vehicle, ship, spacecraft, etc. Electric toys may include fixed or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric aircraft toys. Spacecraft may include airplanes, rockets, space shuttles, and spacecraft, etc.

[0061] The "device body" refers to the main structure that consumes electrical energy to perform its corresponding functions. For example, a power-consuming device could be a mobile phone, where the "device body" is the portion that performs functions such as communication, and power is supplied to this portion via a battery cell or battery pack. For example, a power-consuming device could be a car, where the "device body" is the portion that provides passengers with a seat and allows them to travel on the road, and power is supplied to this portion via a battery cell or battery pack.

[0062] A battery pack is a device that can output electrical energy. For example, a battery pack consisting of battery cells can output electrical energy. For example, a battery module consisting of battery cells can output electrical energy, and a battery pack consisting of battery modules can output electrical energy.

[0063] The electric device according to an embodiment of the present disclosure is described as a vehicle as an example.

[0064] The vehicle provided in one embodiment of the present disclosure may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery pack is provided inside the vehicle, and the battery pack may be provided at the bottom, head or tail of the vehicle. The battery pack may be used to power the vehicle. For example, the battery pack may serve as an operating power source for the vehicle. The vehicle may also include a controller and a motor, and the controller may be used to control the battery pack to power the motor. For example, the battery pack may be used for starting, navigating and operating power requirements of the vehicle during driving.

[0065] In some embodiments of the present disclosure, the battery pack can serve not only as the operating power source of the vehicle, but also as the driving power source of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0066] The present disclosure also provides a battery pack, which includes a mounting case and a battery cell, wherein the battery cell is disposed inside the mounting case.

[0067] The present disclosure also provides a battery unit, which includes at least two battery cells and one or at least two tabs. The tabs are electrically connected to two different battery cells, respectively. Exemplarily, the number of battery cells can be multiple, and the multiple battery cells can be connected in series, in parallel, or in mixed connection. Mixed connection means that multiple battery cells are connected in series and in parallel. Multiple battery cells can be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the multiple battery cells is placed in a box. Of course, multiple battery cells can first be connected in series, in parallel, or in mixed connection to form a battery module, and the multiple battery modules can then be connected in series, in parallel, or in mixed connection to form a whole, and the whole formed by the multiple battery modules connected in series, in parallel, or in mixed connection is placed in the box. The battery pack may also include other structures. For example, the battery pack may also include a busbar component for realizing electrical connection between multiple battery cells.

[0068] The present disclosure also provides a battery cell, please refer to Figures 1 to 4, the battery cell includes a shell assembly 1, a bare cell 2 and a pole 3. The bare cell 2 is arranged inside the shell assembly. The pole 3 is arranged in the shell assembly 1, and the pole 3 is electrically connected to the tab 20 of the bare cell 2. The number of poles 3 is at least two, at least one pole 3 is electrically connected to the positive tab 20 of the bare cell 2, and at least one pole 3 is electrically connected to the negative tab 20 of the bare cell 2. The pole 3 includes a first connecting portion 30 and a second connecting portion 31 that are interconnected. When projected along the arrangement direction of the bare cell 2 and the pole 3, the projected area of ​​the first connecting portion 30 and the projected area of ​​the second connecting portion 31 do not overlap with each other. The first connecting portion 30 is used for welding to the tab 20 of the bare cell 2, and the second connecting portion 31 is used for welding to the tab.

[0069] A battery cell is a unit that can convert chemical energy into electrical energy.

[0070] In the embodiment of the present disclosure, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0071] In the embodiments of the present disclosure, the battery cells may be lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, etc., but the embodiments of the present disclosure are not limited to this.

[0072] For example, the present disclosure does not limit the type of the bare cell 2 , and the bare cell 2 may be a square wound cell or a laminated cell.

[0073] Projected along the arrangement direction of the bare battery cell 2 and the pole 3, the projection area of ​​the first connection part 30 and the projection area of ​​the second connection part 31 do not overlap with each other, which means that the contour line of the projection area of ​​the first connection part 30 and the contour line of the projection area of ​​the second connection part 31 can be connected, but the projection area of ​​the first connection part 30 and the projection area of ​​the second connection part 31 have no intersecting parts.

[0074] In the embodiment of the present disclosure, the pole 3 is provided in the housing assembly 1. The first connection portion 30 of the pole 3 is welded to the tab 20 of the bare cell 2, and the second connection portion 31 is used for welding to the tab. Projected along the arrangement direction of the bare cell 2 and the pole 3, the projected area of ​​the first connection portion 30 and the projected area of ​​the second connection portion 31 do not overlap. The first connection portion 30 and the second connection portion 31 need to be welded to the tab 20 and the tab. Arranging the first connection portion 30 and the second connection portion 31 side by side can reduce the overall height of the pole 3 in the battery cell. Thus, when the height of the battery cell is constant, the height of the bare cell 2 can be as large as possible, thereby increasing the energy density of the battery cell.

[0075] It is understandable that the present disclosure is not limited to welding the first connecting portion 30 to the tab 20 of the bare cell 2. Exemplarily, the adapter is welded to the tab 20 of the bare cell 2 and the first connecting portion 30 respectively to achieve electrical connection between the first connecting portion 30 and the tab 20 of the bare cell 2.

[0076] Exemplarily, each tab is electrically connected to the pole 3 of a corresponding battery cell and the second connection portion 31 of another corresponding battery cell.

[0077] In one embodiment, the material of the tab is the same as that of the second connecting portion 31 .

[0078] In the embodiment of the present disclosure, the material of the tab is the same as that of the second connection portion 31. The tab and the second connection portion 31 have better convection capabilities.

[0079] In one embodiment, referring to FIG. 2 , at least one pole 3 is a composite pole 3 , and the first connecting portion 30 and the second connecting portion 31 of the composite pole 3 are made of different materials.

[0080] In the embodiment of the present disclosure, the material of the tab 20 welded to the first connecting portion 30 is the same as that of the first connecting portion 30, resulting in better convection between the first connecting portion 30 and the corresponding tab 20. The material of the positive tab 20 of the bare cell 2 is different from that of the negative tab 20. After the tab is welded to the second connecting portion 31, it needs to be welded to the corresponding tab 20 of another battery cell. Accordingly, the materials of the first connecting portion 30 and the second connecting portion 31 are different. Furthermore, the composite material of the terminal 3 can combine the advantages of multiple materials to increase the current carrying capacity and corrosion resistance of the terminal 3.

[0081] It is understandable that the present disclosure is not limited to at least one pole 3 being a composite pole 3. Exemplarily, the first connecting portions 30 and the second connecting portions 31 of all poles 3 are made of the same material.

[0082] Exemplarily, the first connection portion 30 and the second connection portion 31 of the pole 3 for electrically connecting to the positive tab 20 of the bare battery cell 2 are made of the same material, and the pole 3 for electrically connecting to the negative tab 20 of the bare battery cell 2 is a composite pole 3 .

[0083] Exemplarily, the material of the first connecting portion 30 is consistent with the material of the negative electrode tab 20 of the bare battery cell 2 , and the material of the second connecting portion 31 is consistent with the material of the tab.

[0084] In one embodiment, the first connection portion 30 of the composite pole 3 is made of copper, and the second connection portion 31 of the composite pole 3 is made of aluminum.

[0085] For example, the first connection portion 30 and the second connection portion 31 may be connected by heating and pressurizing to form the composite pole 3 .

[0086] In the embodiment of the present disclosure, the first connecting portion 30 is made of copper, and the second connecting portion 31 is made of aluminum. The copper-aluminum composite terminal 3 exhibits excellent corrosion resistance and maintains good stability under various environmental conditions. Furthermore, the copper-aluminum composite terminal 3 exhibits good wear resistance, which allows it to withstand stress during battery operation and is less susceptible to damage.

[0087] It is understood that the present disclosure is not limited to the first connecting portion 30 and the second connecting portion 31 of the composite electrode 3 being made of copper and aluminum, respectively. For example, the first connecting portion 30 of the composite electrode 3 is made of nickel, the second connecting portion 31 is made of cobalt, the negative electrode tab 20 of the bare cell 2 is made of nickel, and the positive electrode tab 20 of the bare cell 2 is made of cobalt.

[0088] In one embodiment, referring to FIG. 4 , the thickness of the first connection portion 30 ranges from 0.5 mm to 5 mm.

[0089] Exemplarily, the thickness direction 3 b of the first connection portion 30 is arranged along the arrangement direction of the electrode column 3 and the battery cell.

[0090] Exemplarily, the thickness of the first connecting portion 30 is shown as dimension D1 in FIG. 4 .

[0091] Exemplarily, the thickness of the first connection portion 30 is 0.5 mm, 1.0 mm, 1.5 mm, 2.5 mm, 3.5 mm, 4 mm, 4.5 mm, or 5.0 mm.

[0092] It is understandable that the thickness of the first connecting portion 30 can be measured using a vernier caliper in a normal temperature and pressure environment before the battery cell is charged for the first time.

[0093] In the solution of the embodiment of the present disclosure, the thickness of the first connecting portion 30 can be within a relatively appropriate range to ensure a high welding strength between the first connecting portion 30 and the tab 20 and to make the thickness of the pole 3 as small as possible, thereby making the energy density of the battery cell as large as possible.

[0094] In one embodiment, referring to FIG. 4 , the thickness of the second connection portion 31 ranges from 1.5 mm to 5 mm.

[0095] Exemplarily, the thickness direction 3 b of the second connection portion 31 is arranged along the arrangement direction of the electrode column 3 and the battery cell.

[0096] Exemplarily, the thickness of the second connection portion 31 is 1.5 mm, 2.0 mm, 2.5 mm, 3.0 mm, 3.5 mm, 4.0 mm, 4.5 mm, or 5.0 mm.

[0097] Exemplarily, the thickness of the second connection portion 31 is shown as dimension D2 in FIG. 4 .

[0098] It is understandable that the thickness of the second connecting portion 31 can be measured using a vernier caliper in a normal temperature and pressure environment before the battery cell is charged for the first time.

[0099] In the disclosed embodiment, the thickness of the second connection portion 31 is within a relatively suitable range to ensure both a high welding strength between the second connection portion 31 and the tab and to minimize the thickness of the pole 3, thereby maximizing the energy density of the battery cell.

[0100] In one embodiment, referring to FIG. 4 , the thickness of the first connection portion 30 is equal to the thickness of the second connection portion 31 .

[0101] In the disclosed embodiment, the thickness of the first connection portion 30 is equal to the thickness of the second connection portion 31 , which reduces the difficulty of positioning the first connection portion 30 and the second connection portion 31 during connection, thereby making the pole 3 simpler to process.

[0102] It is understood that the present disclosure is not limited to the thickness of the first connection portion 30 being equal to the thickness of the second connection portion 31. For example, the thickness of the second connection portion 31 is greater than the thickness of the first connection portion 30.

[0103] In one embodiment, please refer to Figure 3, the pole 3 for electrically connecting to the positive tab 20 of the bare battery cell 2 and the pole 3 for electrically connecting to the negative tab 20 of the bare battery cell 2 are arranged at intervals along a preset direction 3a, the preset direction 3a is arranged crosswise with the arrangement direction of the pole 3 and the bare battery cell 2, and the first connecting portion 30 and the second connecting portion 31 are arranged along the preset direction 3a.

[0104] Exemplarily, referring to FIG. 3 , the preset direction 3 a is arranged orthogonally to the arrangement direction of the poles 3 and the bare cells 2 .

[0105] In the embodiment of the present disclosure, the first connection part 30 and the second connection part 31 are arranged along the preset direction 3a, and the shell assembly 1 can have a larger space to arrange the first connection part 30 and the second connection part 31. The dimensions of the first connection part 30 and the second connection part 31 along the preset direction 3a can be made larger, thereby reducing the difficulty of positioning the first connection part 30 and the second connection part 31 during the welding process, thereby making it more difficult to manufacture the battery cell.

[0106] It is understood that the present disclosure is not limited to the first connection portion 30 and the second connection portion 31 being arranged along the preset direction 3a. In one embodiment, the arrangement direction of the first connection portion 30 and the second connection portion 31 is arranged to intersect with the arrangement direction of the electrode 3 and the bare cell 2, and the arrangement direction of the first connection portion 30 and the second connection portion 31 is arranged to intersect with the preset direction 3a.

[0107] In one embodiment, along the predetermined direction 3 a , the size of the second connection portion 31 is greater than or equal to the size of the first connection portion 30 .

[0108] In the embodiment of the present disclosure, during the welding process of the pole 3 and the tab, the positioning difficulty is greater than that of the welding of the pole 3 and the tab 20. The size of the second connecting part 31 is greater than or equal to the size of the first connecting part 30, which can alleviate the situation in which the tab needs to be positioned for a long time during the welding process of the second connecting part 31 and the tab, thereby speeding up the welding efficiency.

[0109] It is understood that the embodiment of the present disclosure is not limited to the second connection portion 31 being larger than or equal to the first connection portion 30 along the preset direction 3a. In one embodiment, the second connection portion 31 is smaller than the first connection portion 30 along the preset direction 3a.

[0110] In one embodiment, referring to Figures 1 to 4 , a battery cell includes a housing assembly 1, a bare cell 2, and a terminal 3. The bare cell 2 is disposed within the housing assembly 1. The terminal 3 is disposed within the housing assembly 1 and electrically connected to the tab 20 of the bare cell 2. There are at least two terminals 3, at least one of which is electrically connected to the positive tab 20 of the bare cell 2, and at least one of which is electrically connected to the negative tab 20 of the bare cell 2. The terminal 3 includes a first connecting portion 30 and a second connecting portion 31 that are interconnected. When projected along the arrangement direction of the bare cells 2 and the terminal 3, the projected area of ​​the first connecting portion 30 and the projected area of ​​the second connecting portion 31 do not overlap. The first connecting portion 30 is used for welding to the tab 20 of the bare cell 2, and the second connecting portion 31 is used for welding to the tab. The terminal 3 electrically connected to the negative tab 20 of the bare cell 2 is a composite terminal 3. The first connecting portion 30 of the composite terminal 3 is made of copper, and the second connecting portion 31 of the composite terminal 3 is made of aluminum. The thickness of the first connecting portion 30 ranges from 0.5 mm to 5.0 mm, and the thickness of the second connecting portion 31 ranges from 1.5 mm to 5.0 mm. The thickness of the first connecting portion 30 is equal to the thickness of the second connecting portion 31. The first connecting portion 30 and the second connecting portion 31 are arranged along the predetermined direction 3 a. Along the predetermined direction 3 a, the size of the second connecting portion 31 is greater than or equal to the size of the first connecting portion 30.

[0111] The above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than to limit them. Although the present disclosure has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present disclosure, and they should all be included in the scope of the claims and description of the present disclosure. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present disclosure is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, comprising: Housing assembly; A bare battery cell is disposed inside the housing assembly; A pole is arranged in the shell assembly, and the pole is electrically connected to the pole ear of the bare battery cell. The number of the poles is at least two, at least one pole is electrically connected to the positive pole ear of the bare battery cell, and at least one pole is electrically connected to the negative pole ear of the bare battery cell. The pole includes a first connecting portion and a second connecting portion that are connected to each other. When projected along the arrangement direction of the bare battery cell and the pole, the projection area of ​​the first connecting portion and the projection area of ​​the second connecting portion do not overlap with each other. The first connecting portion is welded to the pole ear of the bare battery cell, and the second connecting portion is used to be welded to the bar.

2. The battery cell according to claim 1, wherein: At least one of the poles is a composite pole, the first connecting portion and the second connecting portion of the composite pole are made of different materials, and the pole tab welded to the first connecting portion is made of the same material as the first connecting portion.

3. The battery cell according to claim 2, wherein: The first connecting portion of the composite pole is made of copper, and the second connecting portion of the composite pole is made of aluminum.

4. The battery cell according to any one of claims 1 to 3, wherein: The thickness of the first connecting portion ranges from 0.5 mm to 5.0 mm.

5. The battery cell according to any one of claims 1 to 4, wherein: The thickness of the second connecting portion ranges from 1.5 mm to 5.0 mm.

6. The battery cell according to any one of claims 1 to 5, wherein: The thickness of the first connecting portion is equal to the thickness of the second connecting portion.

7. The battery cell according to any one of claims 1 to 6, wherein: The pole for electrically connecting to the positive electrode tab of the bare battery cell and the pole for electrically connecting to the negative electrode tab of the bare battery cell are arranged at intervals along a preset direction, the arrangement direction of the pole and the bare battery cell is arranged crosswise to the preset direction, and the first connecting portion and the second connecting portion are arranged along the preset direction.

8. The battery cell according to claim 7, wherein: Along the preset direction, a size of the second connecting portion is greater than or equal to a size of the first connecting portion.

9. A battery cell comprising: At least two battery cells according to any one of claims 1 to 8; One or at least two tabs, each tab being electrically connected to a corresponding pole of one of the battery cells and the second connecting portion of a corresponding other battery cell.

10. The battery cell according to claim 9, wherein The material of the tab is the same as that of the second connecting portion.

11. A battery pack comprising: Install the shell; At least one battery cell according to claim 9 or 10 is disposed inside the mounting case.

12. An electrical device, wherein: include: Device body; The battery pack according to claim 11, used to supply power to a device body.

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