Battery monomer, battery device and electric equipment

Abstract

The utility model relates to the technical field of battery production, in particular to a battery monomer, a battery device and electric equipment. The battery monomer comprises an electrode assembly, the electrode assembly comprises two wound pole pieces with opposite polarities, each pole piece comprises a main body part and a tab part, the main body part is provided with a first side edge and a second side edge in a first direction, the first side edge and the second side edge are oppositely arranged, and the tab part is arranged on the first side edge or the second side edge; the tab part comprises a body part and a die-cutting part which are connected with each other, the die-cutting part is arranged on at least one side of the body part in the second direction, a clearance area is arranged at one end, deviating from the body part, of the die-cutting part, and at least part of the clearance area is arranged at one end, deviating from the body part, of the die-cutting part; wherein the first direction is the width direction of the main body part, and the second direction is the length direction of the main body part.

Description

Technical Field

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

[0002] This section provides only background information relevant to this disclosure and is not necessarily prior art.

[0003] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. In this context, electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of the automotive industry's sustainable development. And for electric vehicles, battery technology is a crucial factor in their development.

[0004] During the production of battery cells, there is a flattening process. In this process, the outer tabs are easily bent. The bent tabs are prone to electrical connection with the electrode plates of opposite polarity, which can lead to self-discharge of the battery cell. Utility Model Content

[0005] In view of the above problems, this application provides a battery cell, a battery device, and an electrical device, which solves the problem that battery cells in the prior art are prone to self-discharge.

[0006] A first aspect of the embodiments of this application provides a battery cell, the battery cell including an electrode assembly, the electrode assembly including two wound electrodes with opposite polarities, the electrode including a main body and an electrode tab, the main body having a first side and a second side in a first direction, the first side and the second side being disposed opposite to each other, the electrode tab being disposed on the first side or the second side; the electrode tab including a body part and a die-cutting part connected to each other, the die-cutting part being disposed on at least one side of the body part along a second direction, the die-cutting part having a clearance area at one end away from the body part, and at least a portion of the clearance area being disposed at one end of the die-cutting part away from the body part; wherein, the first direction is the width direction of the main body part, and the second direction is the length direction of the main body part.

[0007] The embodiments of this application provide a die-cutting portion on at least one side of the body portion of the tab portion along the second direction, and provide a clearance area at the end of the die-cutting portion away from the body portion, and at least part of the clearance area is provided at the end of the die-cutting portion away from the body portion. This allows the tab portion to reduce the probability of electrical connection between the tab portion and the electrode sheet with opposite polarity after bending during the bending process, since the right-angle structure of the tab portion is removed, thereby reducing the probability of self-discharge of the battery cell.

[0008] In some embodiments of this application, die-cutting portions are provided on both sides of the body portion along the second direction.

[0009] The embodiments of this application provide die-cut portions on both sides of the body portion along the second direction, thereby removing the right-angled structures at both ends of the tab portion along the first direction, which further reduces the probability that the tab portion will be electrically connected to the electrode sheet with opposite polarity after bending.

[0010] In some embodiments of this application, the die-cutting part includes a die-cutting area, the body part includes a first end portion, the first end portion is disposed away from the body part and is disposed parallel to and spaced apart from the first side edge, and both the first side edge and the first end portion intersect with the die-cutting area.

[0011] The embodiments of this application provide a die-cutting area, and the first side and the first end of the main body are both intersected with the die-cutting area. This allows the die-cutting part to be directly processed by the die-cutting process, making it convenient to process the die-cutting part of the tab.

[0012] In some embodiments of this application, the angle between the die-cutting area and the first side edge is an acute angle.

[0013] The embodiments of this application, by making the angle between the die-cutting area and the first side edge an acute angle, can remove the right-angle structure from the tab of the rectangular structure, thereby facilitating the processing of the clearance area.

[0014] In some embodiments of this application, the angle between the die-cutting area and the first side edge is greater than or equal to 2° and less than 90°.

[0015] The embodiments of this application, by having an angle between the die-cutting area and the first side edge greater than or equal to 2° and less than 90°, can facilitate the processing of the die-cutting part on the one hand, and make the area of ​​the clearance region moderate on the other hand, reducing the impact on the current flow performance of the electrode tab.

[0016] In some embodiments of this application, the angle between the die-cutting area and the first side edge is greater than or equal to 30° and less than or equal to 60°.

[0017] The embodiments of this application use an angle between the die-cutting area and the first side that is greater than or equal to 30° and less than or equal to 60°. On the one hand, this facilitates the processing of the die-cutting part, and on the other hand, it makes the area of ​​the clearance area moderate, reducing the impact on the current flow performance of the electrode tab.

[0018] In some embodiments of this application, two electrodes with opposite polarities include a positive electrode, which includes a positive electrode body and a positive electrode tab, with the positive electrode tab connected to the positive electrode body.

[0019] The embodiments of this application provide a positive electrode sheet, which includes a positive electrode body and a positive electrode tab. The positive electrode tab is connected to the positive electrode body. A die-cut portion can be processed on the positive electrode tab of the positive electrode sheet, thereby reducing the probability of electrical connection between the positive electrode tab and the negative electrode sheet after bending.

[0020] In some embodiments of this application, two electrodes with opposite polarities include a negative electrode, which includes a negative electrode body and a negative electrode tab, with the negative electrode tab connected to the negative electrode body.

[0021] The embodiments of this application provide a negative electrode sheet, wherein the negative electrode sheet includes a negative electrode body and a negative electrode tab, and the negative electrode tab is connected to the negative electrode body. A die-cut portion can be processed on the negative electrode tab of the negative electrode sheet, thereby reducing the probability of electrical connection between the bent negative electrode tab and the positive electrode sheet.

[0022] In some embodiments of this application, the battery cell further includes a separator, with a positive electrode and a negative electrode respectively disposed on opposite sides of the separator.

[0023] The embodiments of this application, by setting a separator and setting a positive electrode and a negative electrode on opposite sides of the separator, can form a cylindrical structure through a stacked and wound structure, thereby forming a battery cell.

[0024] In some embodiments of this application, the battery cell has a cylindrical structure.

[0025] The embodiments of this application, by setting the battery cell to a cylindrical structure, allow the battery cell to take advantage of the advantages of the cylindrical structure and slow down the performance degradation of the battery cell.

[0026] A second aspect of the embodiments of this application provides a battery device comprising the battery cells mentioned in the above embodiments.

[0027] A third aspect of the embodiments of this application provides an electrical device that includes the battery device mentioned in the above embodiments, the battery device being used to supply power to the electrical device.

[0028] 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

[0029] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. 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:

[0030] Figure 1 This is a schematic diagram of the structure of a single battery cell provided in some embodiments of this application;

[0031] Figure 2 for Figure 1 A partially enlarged structural diagram of the battery device shown at point A;

[0032] Figure 3 This is a schematic diagram of the structure of a battery device provided in some embodiments of this application;

[0033] Figure 4 This is a schematic diagram of the structure of an electrical device provided in some embodiments of this application;

[0034] Figure 5 for Figure 1 The diagram shows the structure of a bare cell in a battery unit.

[0035] Figure 6 for Figure 1 Another structural schematic diagram of the bare cell of the battery unit shown;

[0036] Figure 7 for Figure 5 The diagram shows a bare battery cell with the positive electrode plate in an unfolded state.

[0037] Figure 8 for Figure 5 Another structural schematic diagram of the bare battery cell with the positive electrode plate in an unfolded state;

[0038] Figure 9 for Figure 5 This is another structural schematic diagram showing the positive electrode of the bare battery cell in an unfolded state.

[0039] The attached figures are labeled as follows:

[0040] 100. Battery device; 200. Vehicle; 300. Controller; 400. Motor;

[0041] 1. Battery cell;

[0042] 10. First end wall; 11. Pole post; 12. Pressure relief mechanism;

[0043] 20. Second end wall; 21. Collector plate;

[0044] 30. First electrode ear glue;

[0045] 40. Electrode assembly; 41. Electrode sheet; 411. Main body; 4111. First side; 4112. Second side; 4113. Coated area; 4114. Blank area; 412. Separator; 413. Positive electrode sheet; 414. Negative electrode sheet; 415. Electrode tab; 4151. Main body; 4152. Die-cutting part; 41521. Die-cutting area; 41522. Clearance area; 4153. Inner end; 4154. Outer end; 4155. First end; 416. Positive electrode tab; 417. Negative electrode tab;

[0046] 50. Second electrode ear glue;

[0047] 60. Insulating adhesive;

[0048] 70. Shell;

[0049] 2. Enclosure assembly;

[0050] α, the angle between the die-cutting area and the first side edge;

[0051] H, the height of the die-cutting area;

[0052] W, the width of the die-cutting area;

[0053] XX, Second Direction;

[0054] YY, First Direction; Detailed Implementation

[0055] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0056] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0057] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0058] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0059] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0060] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0061] In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0062] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0063] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of battery device applications, market demand is also constantly increasing.

[0064] The battery devices described in this application can be used, but are not limited to, in electrical equipment such as vehicles, ships, or aircraft. Such electrical equipment can be composed of battery cells and battery devices as described in this application.

[0065] In this application embodiment, the electrical devices using battery devices as power sources can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0066] It should be understood that the technical solutions described in the embodiments of this application are not limited to the battery devices and electrical equipment described above, but can also be applied to all batteries including housings and electrical equipment using batteries.

[0067] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via a busbar.

[0068] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0069] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0070] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0071] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0072] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0073] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0074] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0075] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0076] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly consists of a positive electrode, a negative electrode, and a separator. The battery cell primarily functions by the movement of metal ions between the positive and negative electrodes. The positive electrode includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. Current collectors without the positive active material layer protrude beyond those with the coating. These uncoated current collectors are stacked together to form the positive electrode tab. Taking a lithium-ion battery as an example, the positive current collector can be made of aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector. Current collectors without the negative active material layer protrude beyond those with the coating. These uncoated current collectors are stacked together to form the negative electrode tab. The negative current collector can be made of copper, and the negative active material can be carbon or silicon, etc. The separator can be made of PP (polypropylene) or PE (polyethylene), etc. Furthermore, the electrode assembly can be a wound structure or a stacked structure; the embodiments of this application are not limited to these.

[0077] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use individual battery cells, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0078] During the production of battery cells, there is a flattening process. In this process, the tabs are usually rectangular. The right-angled rectangular structure is prone to electrical connection with the electrode sheet of opposite polarity during the bending process, which can lead to self-discharge of the battery cell.

[0079] To address this problem, embodiments of this application propose a battery cell. The battery cell includes an electrode assembly comprising two electrodes with opposite polarities. Each electrode includes a main body and a tab. The main body has a first side and a second side in a first direction, which are disposed opposite to each other. A tab is disposed on either the first or second side. The tab includes a body portion and a die-cutting portion connected to each other. The die-cutting portion is disposed on at least one side of the main body along a second direction. A clearance area is provided at the end of the die-cutting portion away from the main body, and at least a portion of the clearance area is located at the end of the die-cutting portion away from the main body. The first direction is the width direction of the main body, and the second direction is the length direction of the main body. The embodiments of this application provide a die-cutting portion on at least one side of the body portion of the tab portion along the second direction, and provide a clearance area at the end of the die-cutting portion away from the body portion, and at least part of the clearance area is provided at the end of the die-cutting portion away from the body portion. This allows the tab portion to reduce the probability of electrical connection between the tab portion and the electrode sheet with opposite polarity after bending during the bending process, since the right-angle structure of the tab portion is removed, thereby reducing the probability of self-discharge of the battery cell.

[0080] The battery cells in the embodiments of this application can be used in electrical equipment such as vehicles, or can be installed in electrical equipment where battery cells need to be installed in advance.

[0081] The structures in the embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0082] The first aspect of the embodiments of this application proposes a battery cell 1, such as Figure 1 and Figure 2 As shown, the battery cell 1 includes a first end wall 10, a second end wall 20, a first tab adhesive 30, a second tab adhesive 50, an electrode assembly 40, an insulating adhesive 60, and a housing 70. The housing 70 is disposed on the outside of the insulating adhesive 60. The housing 70 can be made of metal, such as aluminum alloy or steel alloy. That is to say, the surface of the electrode assembly 40 is coated with insulating adhesive 60 to isolate the electrode assembly 40 and the housing 70 and prevent the housing 70 from conducting electricity. The insulating adhesive 60 can be made of tape, such as blue film or other insulating film. The first tab adhesive 30 and the second tab adhesive 50 are tapes that protect, fix, and insulate the tabs. These are common components in the prior art and will not be described in detail here.

[0083] Optionally, the battery cell 1 also includes a current collector 21, a terminal post 11, and a pressure relief mechanism 12. The pressure relief mechanism and the terminal post 11 can be disposed on the first end wall 10 or on the second end wall 20. These components are common components of the battery cell 1, and the connection relationship between these components will not be described here.

[0084] like Figures 5 to 9As shown, the electrode assembly 40 includes two polarity-wound electrode sheets 41 with opposite orientations. Each electrode sheet 41 includes a main body portion 411 and an electrode tab portion 415. The main body portion 411 has a first side 4111 and a second side 4112 in a first direction. The first side 4111 and the second side 4112 are arranged opposite to each other. The electrode tab portion 415 is provided on either the first side 4111 or the second side 4112. The electrode tab portion 415 includes a body portion 4151 and a die-cutting portion 4152 connected to each other. The die-cutting portion 4152 is provided on at least one side of the body portion 4151 along a second direction. The die-cutting portion 4152 has a clearance area 41522 at one end away from the body portion 4151, and at least a portion of the clearance area 41522 is located at one end of the die-cutting portion 4152 away from the body portion 411. The first direction is the width direction of the main body portion 411, and the second direction is the length direction of the main body portion 411.

[0085] It should be noted that the electrode 41 here includes two parts: the main body 411 and the tab 415. The main body 411 includes a blank area 4114 and a coating area 4113. The main body 411 refers to the sheet obtained by coating a conductive active material onto a substrate, then drying it in an oven and cutting it. The area coated with the conductive active material is the coating area 4113, and the other part is the blank area 4114.

[0086] Electrode 41 can refer to positive electrode 413 or negative electrode 414. When electrode 41 is positive electrode 413, the substrate of positive electrode 413 can be aluminum foil; when electrode 41 is negative electrode 414, the substrate of negative electrode 414 can be copper foil.

[0087] The tab 415 is a structure that is integral with the main body 411, obtained by die-cutting, or it can be a separate structure from the main body 411. The tab 415 is connected to the main body 411 by welding or other means.

[0088] Continue to refer to Figure 5 As shown, the tab portion 415 is usually a rectangular structure. The right-angled structure of the tab portion 415 is easy to insert between the positive electrode 413 and the negative electrode 414 during the bending process and be electrically connected to the electrode 41 with the opposite polarity. Therefore, in the embodiments of this application, by providing a die-cutting portion 4152 on at least one side of the body portion 4151 along the second direction, and providing a clearance area 41522 at the end of the die-cutting portion 4152 away from the body portion 4151, and at least part of the clearance area 41522 is provided at the end of the die-cutting portion 4152 away from the body portion 411, the right angle of the rectangular structure can be removed, reducing the probability that the right-angled structure of the tab portion 415 is electrically connected to the electrode 41 with the opposite polarity, thereby reducing the probability of self-discharge of the battery cell 1.

[0089] The first direction here is Figure 7The YY direction, the second direction is Figure 5 The length direction of the positive electrode 413 when it is in the unfolded state, that is Figure 7 In the XX direction.

[0090] In the embodiments of this application, a die-cutting portion 4152 is provided on at least one side of the body portion 4151 of the tab portion 415 along the second direction, and a clearance area 41522 is provided at the end of the die-cutting portion 4152 away from the body portion 4151, and at least a portion of the clearance area 41522 is provided at the end of the die-cutting portion 4152 away from the body portion 411. This allows the tab portion 415 to be bent during the bending process, and since the right-angle structure of the tab portion 415 is removed, the probability of the tab portion 415 being electrically connected to the electrode sheet 41 with opposite polarity after bending is reduced, thereby reducing the probability of self-discharge of the battery cell 1.

[0091] Continue to refer to Figures 5 to 7 As shown, the die-cutting part 4152 can be provided on one side of the body part 4151 along the second direction, or on both sides of the body part 4151 along the second direction. Normally, the tab part 415 is provided with an inner end 4153 and an outer end 4154, wherein the inner end 4153 is the feed end and the outer end 4154 is the beginning and end. The die-cutting part can be formed at the outer end 4154 or the inner end 4153. Of course, the die-cutting part 4152 can be provided at both the outer end 4154 and the inner end 4153 of the tab part 415.

[0092] Continue to refer to Figure 9 As shown, the main body 4151 is provided with die-cutting portions 4152 on both sides along the second direction, which can remove the two right-angled structures of the tab 415 along the second direction, thereby reducing the probability that the tab 415 will come into contact with the electrode sheet 41 of opposite polarity during the bending process.

[0093] In the embodiments of this application, by providing die-cut portions 4152 on both sides of the body portion 4151 along the second direction, the right-angle structure at both ends of the tab portion 415 along the first direction can be removed, thereby further reducing the probability that the tab portion 415 will be electrically connected to the electrode sheet 41 with opposite polarity after bending.

[0094] It should be noted that the die-cutting portions 4152 on both sides of the main body 4151 along the second direction can adopt the same structure or different structures. The structure of the die-cutting portion 4152 will be described in detail below.

[0095] In some embodiments of this application, such as Figure 8As shown, the die-cutting part 4152 includes a die-cutting area 41521, and the body part 4151 includes a first end part 4155. The first end part 4155 is disposed away from the body part 411 and is parallel to and spaced apart from the first side 4111. The first side 4111 and the first end part 4155 are both intersecting with the die-cutting area 41521.

[0096] Here, the first end portion 4155 is located at the top of the body portion 4151, and is typically a straight or planar structure. The die-cutting area 41521 refers to the cutting surface or cutting line of the die-cutting blade. When the thickness of the tab portion 415 is relatively small, the die-cutting area 41521 can be considered a linear structure, which can be a straight or curved structure. When the thickness of the tab portion 415 is relatively large, the die-cutting area 41521 can be considered a planar structure, which can be a planar or curved structure. Figure 6 In the middle, the die-cutting area 41521 has a linear structure.

[0097] By intersecting the die-cutting area 41521 with both the first side 4111 and the first end 4155, an open area 41522 can be formed on the side of the die-cutting area 41521 away from the main body 4151, thereby eliminating the right-angle structure of the tab 415.

[0098] The embodiments of this application provide a die-cutting area 41521, and the first side 4111 and the first end 4155 of the main body 4151 are both intersected with the die-cutting area 41521. Thus, the die-cutting part 4152 can be directly processed by the die-cutting process, which facilitates the processing of the die-cutting part 4152 of the tab part 415.

[0099] Optionally, such as Figure 7 As shown, the angle between the die-cutting area 41521 and the first side 4111 is α, where α is an acute angle. When the die-cutting area 41521 is a curved structure, the angle between the die-cutting area 41521 and the first side 4111 can be determined by the tangent line that intersects the die-cutting area 41521 and the first side 4111.

[0100] In the embodiments of this application, by making the angle between the die-cutting area 41521 and the first side 4111 an acute angle, the right-angle structure can be removed from the tab portion 415 of the rectangular structure, thereby facilitating the processing of the clearance area 41522.

[0101] Optionally, the included angle α between the die-cutting area 41521 and the first side 4111 is greater than or equal to 2° and less than 90°, such as 2°, 10°, 15°, 25°, 50° or 90°.

[0102] In the embodiments of this application, by making the angle between the die-cutting area 41521 and the first side 4111 greater than or equal to 2° and less than 90°, on the one hand, it is convenient to process the die-cutting part 4152, and on the other hand, it can make the area of ​​the clearance area 41522 moderate, reducing the impact on the flow performance of the tab part 415.

[0103] Optionally, the included angle α between the die-cutting area 41521 and the first side 4111 is greater than or equal to 30° and less than or equal to 60°, such as 35°, 40°, 50°, 55° or 60°.

[0104] In the embodiments of this application, the angle between the die-cutting area 41521 and the first side 4111 is greater than or equal to 30° and less than or equal to 60°. On the one hand, it is convenient to process the die-cutting part 4152. On the other hand, it can make the area of ​​the clearance area moderate and reduce the impact on the flow performance of the tab part 415.

[0105] It is important to note that the structure of the die-cutting area 41521 is determined here by the angle α between the die-cutting area 41521 and the first side edge 4111. Alternatively, as... Figure 9 As shown, in addition to using the included angle α between the die-cutting area 41521 and the first side 4111 to characterize the tilt degree of the die-cutting area 41521, the embodiments of this application can also use the height H and width W of the die-cutting area 41521 to determine the tilt angle of the die-cutting area 41521 by determining the ratio between H and W. For example, the ratio of H to W can be set to a range of 0.1 to 3, specifically 0.5 or 0.8, etc., thereby determining the tilt degree of the die-cutting area 41521.

[0106] Optionally, such as Figure 5 and Figure 6 As shown, the positive electrode plate 413 includes a positive electrode body portion and a positive electrode tab portion 416, with the positive electrode tab portion 416 connected to the positive electrode body portion.

[0107] In this embodiment, the positive electrode tab 416 is located above the positive electrode body, that is, above the positive electrode body along the YY direction. In this embodiment, the positive electrode plate 413 can be made of aluminum, and the negative electrode plate 414 can be made of copper. The positive electrode body is one type of body plate 411, and the structure of body plate 411 can be used. The positive electrode tab 416 is the part of the positive electrode plate 413 used for electrical connection with the positive terminal.

[0108] The embodiments of this application provide a positive electrode plate 413, which includes a positive electrode body portion and a positive electrode tab portion 416. The positive electrode tab portion 416 is connected to the positive electrode body portion. A die-cut portion 4152 can be processed on the positive electrode tab portion 416 of the positive electrode plate 413, thereby reducing the probability of electrical connection between the positive electrode tab portion 416 and the negative electrode plate 414 after bending.

[0109] Optionally, such as Figure 5 and Figure 6 As shown, the negative electrode plate 414 includes a negative electrode main body and a negative electrode ear 417, with the negative electrode ear 417 connected to the negative electrode main body.

[0110] Among them, the negative electrode main body is one type of main body 411, and the structure of the main body 411 can be adopted. The negative electrode ear 417 is the part of the negative electrode plate 414 used for electrical connection with the negative terminal.

[0111] The embodiments of this application provide a negative electrode sheet 414, which includes a negative electrode body and a negative electrode tab 417. The negative electrode tab 417 is connected to the negative electrode body. A die-cut portion 4152 can be processed on the negative electrode tab 417 of the negative electrode sheet 414, thereby reducing the probability of electrical connection between the bent negative electrode tab 417 and the positive electrode sheet 413.

[0112] It should be noted that both the negative electrode main body and the positive electrode main body are types of the main body 411, and their structures are consistent with those of the main body 411. Therefore, the structures of the negative electrode main body and the positive electrode main body will not be described in detail here.

[0113] Optionally, the battery cell 1 also includes a separator 412, on which a positive electrode 413 and a negative electrode 414 are respectively disposed on opposite sides.

[0114] The separator 412 here can refer to a film material between the positive electrode 413 and the negative electrode 414, which isolates the positive electrode 413 and the negative electrode 414 and prevents electrons in the battery cell 1 from passing through freely, while allowing ions in the electrolyte to pass freely between the positive electrode 413 and the negative electrode 414.

[0115] In the embodiments of this application, by setting a separator 412 and setting a positive electrode 413 and a negative electrode 414 on opposite sides of the separator 412, a cylindrical structure can be formed by a stacked and wound structure, thereby forming the production of a battery cell 1.

[0116] In some embodiments of this application, such as Figure 1 As shown, battery cell 1 has a cylindrical structure.

[0117] The cylindrical structure here refers to the battery cell 1 being a cylindrical battery cell, which can adopt a full tab structure. The positive tab 416 and the negative tab 417 are respectively located on both sides of the cylindrical battery cell along the axial direction. The axial direction here is consistent with the width direction YY of the positive electrode plate 413.

[0118] The embodiments of this application, by setting the battery cell 1 as a cylindrical structure, enable the battery cell 1 to take advantage of the advantages of the cylindrical structure and slow down the performance degradation of the battery cell 1.

[0119] Continue to refer to Figures 5 to 9 As shown, the die-cut portion 4152 can be formed at the outer end 4154 of the positive electrode tab 416, or at the inner end 4153 of the positive electrode tab 416, or simultaneously at both the outer end 4154 and the inner end 4153 of the positive electrode tab 416. It can be understood that the die-cut portion 4152 can be formed at the outer end 4154 of the negative electrode tab 417, or at the inner end 4153 of the negative electrode tab 417, or simultaneously at both the outer end 4154 and the inner end 4153 of the negative electrode tab 417. Figure 5 In the middle, the outer end 4154 of the negative electrode ear 417 has a die-cut portion 4152, while the outer end 4154 of the positive electrode ear 416 does not have a die-cut portion 4152. Figure 6 In the middle, a die-cut portion 4152 is formed on the outer end 4154 of the negative electrode ear 417, and a die-cut portion 4152 is also formed on the outer end 4154 of the positive electrode ear 416. Figure 7 and Figure 9 In the middle, the outer end 4154 of the positive electrode ear portion 416 has a die-cut portion 4152, in Figure 7 The die-cutting area 41521 in the middle has a linear structure. Figure 9 The die-cutting area 41521 in the middle has a curved structure. Figure 8 In the positive electrode tab 416, both the outer end 4154 and the inner end 4153 are formed with die-cut portions 4152, which can better reduce the probability of self-discharge of the battery cell 1.

[0120] A second aspect of the embodiments of this application provides a battery device 100, such as Figure 3 As shown, the battery device 100 includes the battery cell 1 mentioned in the above embodiment.

[0121] Optionally, the battery device 100 also includes a battery cell 1 and a housing assembly 2, wherein there are multiple battery cells 1 placed within the space enclosed by the housing assembly 2.

[0122] A third aspect of the embodiments of this application provides an electrical device 200, such as... Figure 4As shown, the electrical device 200 includes the battery device 100 mentioned in the above embodiment, which is used to supply power to the electrical device 200.

[0123] The electrical device 200 is equipped with a battery device 100, which may be located at the bottom, head, or tail of the electrical device 200. The battery device 100 can be used to power the electrical device 200; for example, the battery device 100 can serve as the operating power source for the electrical device 200. The electrical device 200 may also include a controller 300 and a motor 400. The controller 300 is used to control the battery device 100 to supply power to the motor 400, for example, to meet the power requirements of the electrical device 200 during startup, navigation, and operation.

[0124] The electrical device 200 of the embodiments of this application, by using the battery device 100 mentioned in the above embodiments, improves the working power consumption performance of the electrical device 200 due to the improved performance of the battery device 100.

[0125] 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.

[0126] A first aspect of the embodiments of this application provides a battery cell 1, which includes an electrode assembly 40. The electrode assembly 40 includes two wound electrodes 41 with opposite polarities. Each electrode 41 includes a main body portion 411 and a tab portion 415. The main body portion 411 has a first side 4111 and a second side 4112 in a first direction. The first side 4111 and the second side 4112 are disposed opposite to each other. A tab portion 415 is provided on either the first side 4111 or the second side 4112. 5; The tab portion 415 includes a body portion 4151 and a die-cutting portion 4152 connected to each other. The die-cutting portion 4152 is provided on at least one side of the body portion 4151 along a second direction. The die-cutting portion 4152 has a clearance area 41522 at one end away from the body portion 4151, and at least a portion of the clearance area 41522 is located at one end of the die-cutting portion 4152 away from the main body portion 411. The first direction is the width direction of the main body portion 411, and the second direction is the length direction of the main body portion 411. Further, the die-cutting portion 4152 is provided on both sides of the body portion 4151 along the second direction. Further, the die-cutting portion 4152 includes a die-cutting area 41521, and the body portion 4151 includes a first end portion 4155. The first end portion 4155 is disposed away from the main body portion 411 and is parallel and spaced apart from the first side edge 4111. The first side edge 4111 and the first end portion 4155 both intersect with the die-cutting area 41521. Further, the angle between the die-cutting area 41521 and the first side 4111 is an acute angle. Further, the angle between the die-cutting area 41521 and the first side 4111 is greater than or equal to 2° and less than 90°. Further, the angle between the die-cutting area 41521 and the first side 4111 is greater than or equal to 30° and less than or equal to 60°. Further, the two oppositely polarized electrode sheets 41 include a positive electrode sheet 413, which includes a positive electrode body portion and a positive electrode tab 416, with the positive electrode tab 416 connected to the positive electrode body portion. Further, the two oppositely polarized electrode sheets 41 include a negative electrode sheet 414, which includes a negative electrode body portion and a negative electrode tab 417, with the negative electrode tab 417 connected to the negative electrode body portion. Further, the battery cell 1 also includes a separator 412, with a positive electrode sheet 413 and a negative electrode sheet 414 respectively disposed on opposite sides of the separator 412. Furthermore, the battery cell 1 has a cylindrical structure.

[0127] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A battery cell, characterized in that, include: An electrode assembly includes two wound electrodes with opposite polarities. Each electrode includes a main body and an electrode tab. The main body has a first side and a second side in a first direction. The first side and the second side are disposed opposite to each other. The electrode tab is disposed on the first side or the second side. The tab portion includes a body portion and a die-cutting portion connected to each other. The die-cutting portion is provided on at least one side of the body portion along the second direction. The die-cutting portion has a clearance area at one end away from the body portion, and at least a portion of the clearance area is located at one end of the die-cutting portion away from the body portion. Wherein, the first direction is the width direction of the main body, and the second direction is the length direction of the main body.

2. The battery cell as described in claim 1, characterized in that, The die-cutting portion is provided on both sides of the main body along the second direction.

3. The battery cell as described in claim 1, characterized in that, The die-cutting part includes a die-cutting area, and the body part includes a first end portion. The first end portion is disposed away from the body part and is parallel to and spaced apart from the first side edge. Both the first side edge and the first end portion intersect with the die-cutting area.

4. The battery cell as described in claim 3, characterized in that, The angle between the die-cutting area and the first side is an acute angle.

5. The battery cell as described in claim 4, characterized in that, The angle between the die-cutting area and the first side is greater than or equal to 2° and less than 90°.

6. The battery cell as described in claim 5, characterized in that, The angle between the die-cutting area and the first side is greater than or equal to 30° and less than or equal to 60°.

7. The battery cell according to any one of claims 1 to 6, characterized in that, The two electrodes with opposite polarities include a positive electrode, which includes a positive electrode body and a positive electrode tab, with the positive electrode tab connected to the positive electrode body.

8. The battery cell as described in claim 7, characterized in that, The two electrodes with opposite polarities include a negative electrode, which includes a negative electrode body and a negative electrode tab, with the negative electrode tab connected to the negative electrode body.

9. The battery cell as described in claim 8, characterized in that, The battery cell also includes a separator, on which the positive electrode and the negative electrode are respectively disposed on opposite sides.

10. The battery cell according to any one of claims 1 to 6, characterized in that, The battery cell has a cylindrical structure.

11. A battery device, characterized in that, The battery device includes a battery cell as described in any one of claims 1 to 10.

12. An electrical appliance, characterized in that, Includes the battery device as described in claim 11, the battery device being used to supply power to the electrical device.

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