Roll core, battery cell, battery pack and electric equipment

Abstract

The invention provides a roll core, a battery cell, a battery pack and electric equipment, and relates to the technical field of batteries. The roll core comprises a roll core main body, a first tab, a second tab and a third tab, the roll core main body comprises a first pole piece, a second pole piece and a diaphragm arranged between the first pole piece and the second pole piece, the polarities of the first pole piece and the second pole piece are opposite, and the roll core main body is provided with a first end and a second end along the axial direction of the roll core; the first tab is arranged at the first end and is connected to the first pole piece; the second tab is arranged at the first end and is connected to the second pole piece; and the third tab is arranged at the second end, and the third tab is connected to the first pole piece or the second pole piece. In the application, the first tab and the second tab are arranged at one end of the roll core, and the third tab is arranged at the other end of the roll core, so that the current collection area of the pole piece connected with the third tab can be increased, the conduction paths of electrons are increased, and the current collection capability of the pole piece can be improved. Therefore, the current collecting capacity of the roll core can be improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to battery cores, battery cells, battery packs, and electrical equipment. Background Technology

[0002] In related technologies, a battery cell includes a casing and a wound core disposed within the casing. The wound core includes a positive electrode sheet, a separator, and a negative electrode sheet that are stacked and wound sequentially. Typically, the positive and negative electrodes of the battery cell can be output from the same side or from their respective ends. In the structure where the positive and negative electrodes are output from the same side, the casing of the battery cell is generally used as the output electrode of the negative electrode. Simultaneously, a mounting position for installing a terminal post is insulated and isolated on the top cover of the casing using a sealing element. A terminal post is installed in this mounting position as the output electrode of the positive electrode. A positive electrode tab and a negative electrode tab are respectively provided at the end of the wound core near the top cover. The negative electrode tab is connected to the top cover, and the positive electrode tab is connected to the terminal post, thereby leading out the positive and negative electrodes of the battery cell from the same end of the battery cell. In a structure where positive and negative electrodes are output from both ends of the battery cell, the positive and negative electrodes are located at both ends of the winding core, respectively. The positive electrode is connected to the positive terminal, and the negative electrode is connected to the negative terminal or the outer shell of the battery cell, thereby leading out the positive and negative electrodes of the battery cell from both ends of the battery cell.

[0003] In the above scheme, although the current collection capacity of the winding core basically meets the application requirements of the battery cell, there is still room for improvement in the current collection capacity of the winding core. Summary of the Invention

[0004] Embodiments of this application provide a winding core, a battery cell, a battery pack, and an electrical device that can improve the current collection capacity of the winding core.

[0005] In a first aspect, embodiments of this application provide a core, the core including a core body, a first electrode tab, a second electrode tab, and a third electrode tab; the core body includes a first electrode sheet, a second electrode sheet, and a diaphragm disposed between the first electrode sheet and the second electrode sheet, the first electrode sheet and the second electrode sheet having opposite polarities, and the core body having a first end and a second end along the axial direction of the core; the first electrode tab is disposed at the first end and connected to the first electrode sheet; the second electrode tab is disposed at the first end and connected to the second electrode sheet; the third electrode tab is disposed at the second end and connected to either the first electrode sheet or the second electrode sheet.

[0006] In one embodiment, multiple layers of third tabs are bent and stacked to form a third tab region, which extends circumferentially along the core body as a closed or open ring.

[0007] In one embodiment, along the radial direction of the core, from the center of the core body outward, a first central loop area and a third pole loop area are sequentially provided at the second end.

[0008] In one embodiment, the inner diameter of the third tab region is C, and the outer diameter of the core body is A, satisfying: 3%A≤C≤30%A.

[0009] In one embodiment, along the radial direction of the core, from the center of the core body outward, a third pole lug area and a first peripheral hollow lug area are sequentially provided at the second end.

[0010] In one embodiment, the outer diameter of the third tab region is D, and the outer diameter of the core body is A, satisfying: 65%A≤D≤80%A.

[0011] In one embodiment, the third electrode tab is connected to the first electrode plate, with a plane perpendicular to the axis of the core body as the projection plane and the axis of the core body as the projection direction. In the projection plane, the projection of the first electrode tab before bending and the projection of the third electrode tab before bending at least partially overlap. Alternatively, the third electrode tab is connected to the second electrode plate, with a plane perpendicular to the axis of the core body as the projection plane and the axis of the core body as the projection direction. In the projection plane, the projection of the second electrode tab before bending and the projection of the third electrode tab before bending at least partially overlap.

[0012] In one embodiment, the core further includes a fourth tab, which is disposed at the second end of the core body. One of the third tab and the fourth tab is connected to the first electrode plate, and the other is connected to the second electrode plate.

[0013] In one embodiment, multiple layers of third tabs are bent and stacked to form a third tab region, and multiple layers of fourth tabs are bent and stacked to form a fourth tab region. Along the radial direction of the core body, from the center of the core body outward, the second end is sequentially provided with a fourth tab region, a first middle ring hollow tab region, and a third tab region. The fourth tab region and the third tab region extend along the circumference of the core body to form a closed or unclosed ring.

[0014] In one embodiment, multiple layers of third pole ears are bent and stacked to form a third pole ear region, and multiple layers of fourth pole ears are bent and stacked to form a fourth pole ear region. Along the radial direction of the core body, from the center of the core body outward, a third central hollow ear region, a fourth pole ear region, and a third pole ear region are sequentially provided at the second end. The fourth pole ear region and the third pole ear region extend along the circumference of the core body to form a closed or unclosed ring.

[0015] In one embodiment, the inner diameter of the fourth tab region is J, and the outer diameter of the core body is A, satisfying: 3%A≤J≤22%A.

[0016] In one embodiment, multiple layers of third pole ears are bent and stacked to form a third pole ear region, and multiple layers of fourth pole ears are bent and stacked to form a fourth pole ear region. Along the radial direction of the core body, from the center of the core body outward, a fourth pole ear region, a third pole ear region, and a third peripheral hollow ear region are sequentially provided at the second end. The fourth pole ear region and the third pole ear region extend along the circumference of the core body to form a closed or unclosed ring.

[0017] In one embodiment, the outer diameter of the third tab region is D, and the outer diameter of the core body is A, satisfying: 85%A≤D<100%A.

[0018] In one embodiment, the outer diameter of the core body is A, the outer diameter of the fourth tab region is I, satisfying: 25%A≤I≤35%A; and / or, the inner diameter of the third tab region is C, satisfying: 40%A≤C≤75%A.

[0019] In one embodiment, the third electrode tab is connected to the first electrode plate.

[0020] In one embodiment, a plane perpendicular to the axis of the core body is used as the projection plane, and the axial direction of the core body is used as the projection direction. In the projection plane, the projection of the first tab before bending overlaps with the projection of the third tab before bending.

[0021] In one embodiment, the fourth electrode tab is connected to the second electrode plate.

[0022] In one embodiment, a plane perpendicular to the axis of the core body is used as the projection plane, and the axial direction of the core body is used as the projection direction. In the projection plane, the projection of the second tab before bending overlaps at least partially with the projection of the fourth tab before bending.

[0023] In one embodiment, multiple layers of first electrode tabs are bent and stacked to form a first electrode tab region, and multiple layers of second electrode tabs are bent and stacked to form a second electrode tab region. Along the radial direction of the core body, from the center of the core body outward, a first electrode tab region, a second middle ring hollow tab region and a second electrode tab region are sequentially provided at the first end. The first electrode tab region and the second electrode tab region extend along the circumference of the core to form a closed or open ring.

[0024] In one embodiment, multiple layers of first electrode tabs are bent and stacked to form a first electrode tab region, and multiple layers of second electrode tabs are bent and stacked to form a second electrode tab region. Along the radial direction of the core body, from the center of the core body outward, a second central hollow tab region, a first electrode tab region, and a second electrode tab region are sequentially provided at the first end.

[0025] In one embodiment, the inner diameter of the first tab region is M, and the outer diameter of the core body is A, satisfying: 3%A≤M≤22%A.

[0026] In one embodiment, multiple layers of first electrode tabs are bent and stacked to form a first electrode tab region, and multiple layers of second electrode tabs are bent and stacked to form a second electrode tab region. Along the radial direction of the core body, from the center of the core body outward, the first end is sequentially provided with a first electrode tab region, a second electrode tab region, and a second peripheral hollow tab region.

[0027] In one embodiment, the outer diameter of the second tab region is E, and the outer diameter of the core body is A, satisfying: 85%A≤E<100%A.

[0028] In one embodiment, the outer diameter of the core body is A, the outer diameter of the first tab region is G, satisfying: 35%A≤G≤50%A; and / or, the inner diameter of the second tab region is F, satisfying: 60%A≤F≤75%A.

[0029] In one embodiment, FG ≥ 4 mm.

[0030] In one embodiment, the outer diameter of the second tab region is E, and the inner diameter of the second tab region is F, satisfying: EF≥4mm.

[0031] In one embodiment, the first electrode is a positive electrode and the second electrode is a negative electrode.

[0032] Secondly, embodiments of this application provide a battery cell, which includes a housing and the aforementioned winding core; the housing has a receiving cavity; and the winding core is disposed in the receiving cavity.

[0033] Thirdly, embodiments of this application provide a battery pack, which includes a housing and the aforementioned battery cells, with multiple battery cells installed inside the housing.

[0034] Fourthly, embodiments of this application provide an electrical device that includes the aforementioned battery cell or battery pack, wherein the battery pack or battery cell supplies power to the electrical device.

[0035] The beneficial effects of the embodiments of this application are as follows:

[0036] In the embodiments of this application, by providing a first tab and a second tab at one end of the winding core for positive and negative current collection respectively, and providing a third tab at the other end of the winding core as a single-polarity current collector, the current collection area of ​​the electrode connected to the third tab can be increased, thereby increasing the electron conduction path and improving the current collection capacity of the electrode. Thus, the current collection capacity of the winding core can be improved. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a schematic diagram of the structure of the winding core provided in an embodiment of this application;

[0039] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0040] Figure 3 This is a schematic diagram of the structure of the second end provided in an embodiment of this application;

[0041] Figure 4 This is a schematic diagram of another second end structure provided in an embodiment of this application;

[0042] Figure 5 This is a schematic diagram showing the projection relationship between the third electrode and the first electrode before bending, provided in an embodiment of this application.

[0043] Figure 6 This is a schematic diagram showing the projection relationship between the third electrode and the second electrode before bending, provided in an embodiment of this application.

[0044] Figure 7 This is a schematic diagram of the structure of another core provided in an embodiment of this application;

[0045] Figure 8 This is a schematic diagram of the structure of another second end provided in an embodiment of this application;

[0046] Figure 9 This is a schematic diagram showing the projection relationship between the fourth electrode and the second electrode before bending, provided in an embodiment of this application.

[0047] Figure 10 This is a schematic diagram of the structure of the first end provided in an embodiment of this application;

[0048] Figure 11 This is a schematic diagram of the battery cell structure provided in an embodiment of this application;

[0049] Figure 12 This is a schematic diagram of the battery pack structure provided in an embodiment of this application;

[0050] Figure 13 This is a schematic diagram of the structure of the electrical equipment provided in the embodiments of this application.

[0051] Explanation of reference numerals in the attached figures:

[0052] 001 - Core;

[0053] 011-First pole ear; 111-First pole ear region; 012-Second pole ear; 121-Second pole ear region; 013-Third pole ear; 131-Third pole ear region; 014-Fourth pole ear; 141-Fourth pole ear region;

[0054] 015 - Core body; 151 - First pole piece; 152 - Second pole piece; 153 - Diaphragm; 1541 - First central collimation area; 1542 - Second central collimation area; 1543 - Third central collimation area; 1544 - First peripheral collimation area; 1545 - Second peripheral collimation area; 1546 - Third peripheral collimation area; 1547 - First middle ring collimation area; 1548 - Second middle ring collimation area;

[0055] 016 - Center hole;

[0056] 003 - Battery cell; 031 - Housing; 032 - Cover plate;

[0057] 004 - Battery pack; 041 - Battery box;

[0058] 005 - Electrical equipment. Detailed Implementation

[0059] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0060] Furthermore, it should be understood that the specific embodiments described herein are for illustrative and explanatory purposes only and are not intended to limit the scope of this application. In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in its actual use or operation, specifically the directions shown in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0061] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

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

[0063] The terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0064] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of a core 001 provided in an embodiment of this application. An embodiment of this application provides a core 001. The core 001 includes a core body 015, a first electrode tab 011, a second electrode tab 012, and a third electrode tab 013. The core body 015 includes a first electrode sheet 151, a second electrode sheet 152, and a diaphragm 153 disposed between the first electrode sheet 151 and the second electrode sheet 152, as shown below. Figure 2 As shown, Figure 2 yes Figure 1 Enlarged view of point A in the middle; Figure 2 for Figure 1 The figure shows a magnified partial cross-sectional view of the area indicated at point A, illustrating the cross-sections of a first electrode 151, a second electrode 152, and a diaphragm 153. The first electrode 151 and the second electrode 152 have opposite polarities. Along the axial direction of the core 001, the core body 015 has a first end and a second end. A first electrode tab 011 is disposed at the first end and connected to the first electrode 151. A second electrode tab 012 is disposed at the first end and connected to the second electrode 152. A third electrode tab 013 is disposed at the second end and connected to either the first electrode 151 or the second electrode 152.

[0065] It is understood that the first electrode 151, the diaphragm 153 and the second electrode 152 are stacked and wound in sequence to form the core 001.

[0066] The first electrode 151 and the second electrode 152 include a coated area with active material and an uncoated area without active material. The first tab 011, the second tab 012, and the third tab 013 can be integrally formed as at least a portion of the uncoated area. In other embodiments, the first tab 011 can be separately soldered to the first electrode 151, the second tab 012 can be separately soldered to the second electrode 152, and the third tab 013 can be separately soldered to either the first electrode 151 or the second electrode 152.

[0067] Furthermore, of the first electrode 151 and the second electrode 152, one is a positive electrode and the other is a negative electrode. The first electrode tab 011 and the second electrode tab 012 have opposite polarities, and the third electrode tab 013 has the same polarity as either the first electrode tab 011 or the second electrode tab 012, and the opposite polarity to the other. For example, the first electrode 151 is a positive electrode, and the second electrode 152 is a negative electrode. Correspondingly, the first electrode tab 011 is a positive electrode tab, and the second electrode tab 012 is a negative electrode tab. The third electrode tab 013 is connected to the first electrode 151 and is a positive electrode tab.

[0068] In this embodiment, by providing a first tab 011 and a second tab 012 at one end of the winding core 001 for positive and negative current collection respectively, and providing a third tab 013 at the other end of the winding core 001 as a positive or negative current collector, the current collection area of ​​the electrode connected to the third tab 013 can be increased, thereby increasing the electron conduction path and improving the current carrying capacity of the electrode. Thus, the current carrying capacity of the winding core 001 can be improved.

[0069] Please see Figure 3 or Figure 4 , Figure 3 This is a schematic diagram of the structure of the second end provided in an embodiment of this application. Figure 4 This is a schematic diagram of another second end structure provided by an embodiment of this application. In one embodiment, multiple layers of third tabs 013 are bent and stacked to form a third tab region 131, which extends along the circumference of the core body 015 as a closed or open ring.

[0070] Specifically, the tabs are bent toward the end face of the core so that two radially adjacent tabs are stacked along the axial direction of the core 001.

[0071] Among them, the third electrode area 131 can extend into a closed ring along the circumference of the core body 015, such as Figure 3 As shown; the third electrode tab region 131 can also extend in a non-closed ring along the circumference of the core body 015, that is, the third electrode tab 013 extends in an arc-shaped segment along the circumference of the core body 015. The arc-shaped segment can be one segment or multiple segments, and multiple arc-shaped segments are spaced apart along the circumference of the core body 015, such as... Figure 4 As shown.

[0072] In this embodiment, by extending the third tab 013 along the circumference of the core body 015, on the one hand, the connection length between the third tab 013 and the electrode sheet can be increased, thereby improving the connection strength between the third tab 013 and the electrode sheet, and thus improving the structural reliability of the core 001; on the other hand, the area of ​​the third tab 013 can be increased, thereby increasing the flow area of ​​the core 001, and thus improving the flow capacity of the core 001.

[0073] When the third tab region 131 extends into a closed ring along the circumference of the core body 015, the area of ​​the third tab 013 can be further increased, thereby increasing the current collection area of ​​the electrode connected to the third tab 013, so as to increase the electron conduction path and thus improve the current collection capacity of the electrode.

[0074] In addition, when the third tab area 131 extends in a non-closed ring along the circumference of the core body 015, the obstruction of the tab flattening at the connection between the third tab 013 and the electrode sheet can be controlled, thereby facilitating the smooth flattening operation of the third tab 013 and improving the tab flattening efficiency.

[0075] Please see Figure 3 In one embodiment, along the radial direction of the core 001, from the center of the core body 015 outward, the second end is sequentially provided with a first central ear area 1541 and a third pole ear area 131.

[0076] The open lug area is the area at the end of the core 001 where no pole lug is provided. Specifically, it is the area at the end of the core 001 that is not covered by the pole lug after it is bent and stacked.

[0077] In addition, the central hole 016 of the core 001 is located at the center of the first central ear area 1541.

[0078] It is understandable that after the electrode sheets are wound into core 001, the third tab 013 is parallel to the axial direction of core 001, occupying a relatively large height dimension, which has an adverse effect on the energy density of the cell. Therefore, the third tab 013 is usually bent towards the center of core 001 to reduce the height space occupied by the third tab 013. However, directly bending the third tab 013 would cause it to block the central hole 016 of core 001.

[0079] Based on this, in this embodiment, by setting the first central hollow area 1541, the third electrode tab 013 can be prevented from blocking the middle hole 016 of the core 001, thereby ensuring the smooth flow of electrolyte into or out of the middle hole 016, and thus ensuring the wetting efficiency of the core 001.

[0080] In addition, the first central hollow area 1541 can provide expansion space for the thermally expanded third tab 013, so as to avoid the third tab 013 from being subjected to large stress due to thermal expansion, thereby improving the reliability of the battery cell.

[0081] Please see Figure 3 In one embodiment, the inner diameter of the third tab region 131 is C, and the outer diameter of the core body 015 is A, satisfying: 3%A≤C≤30%A. Wherein, the inner diameter C of the third tab region 131 is the outer diameter of the first central hollow tab region 1541.

[0082] It is understood that the inner diameter C of the third electrode region 131 includes, but is not limited to, 3%A, 6.2%A, 8.3%A, 10%A, 12.1%A, 13.9%A, 14.5%A, 15%A, 17%A, 18.3%A, 20%A, 22.5%A, 23%A, 25.3%A, 27%A, 28.2%A, 29%A, 29.6%A, and 30%A.

[0083] For example:

[0084] When A is 24mm, C includes, but is not limited to, 0.72mm, 0.86mm, 1.08mm, 2.13mm, 2.95mm, 3.11mm, 3.71mm, 4.23mm, 5.25mm, 6.78mm, 7.01mm, and 7.2mm.

[0085] When A is 30mm, C includes, but is not limited to, 0.9mm, 1.06mm, 2.78mm, 3.13mm, 3.85mm, 4.19mm, 5.21mm, 6.23mm, 6.25mm, 7.28mm, 8.29mm, and 9mm.

[0086] When A is 35mm, C includes, but is not limited to, 1.05mm, 2.06mm, 3.78mm, 4.13mm, 4.85mm, 5.19mm, 5.21mm, 6.23mm, 7.25mm, 8.28mm, 9.29mm, and 10.5mm.

[0087] When A is 40mm, C includes, but is not limited to, 1.2mm, 2.06mm, 3.78mm, 4.13mm, 5.85mm, 6.19mm, 7.21mm, 8.23mm, 9.75mm, 10.28mm, 11.29mm, and 12mm.

[0088] When A is 45.5mm, C includes, but is not limited to, 1.365mm, 2.06mm, 3.78mm, 4.13mm, 5.85mm, 6.19mm, 7.21mm, 8.23mm, 9.25mm, 10.28mm, 12.29mm, and 13.65mm.

[0089] In this embodiment, the above-mentioned limitations can, on the one hand, prevent the inner diameter C of the third tab region 131 from being too small, which would cause the third tab 013 to block the intermediate hole 016 of the core 001, thereby ensuring the smooth flow of electrolyte into or out of the intermediate hole 016 and thus ensuring the wetting efficiency of the core 001; on the other hand, can prevent the inner diameter C of the third tab region 131 from being too large, which would affect the radial dimension of the third tab 013, thereby ensuring not only the current collection area of ​​the third tab 013 to improve the current collection capacity of the core 001, but also the welding area of ​​the third tab 013, thereby improving the welding stability between the third tab 013 and the current collector plate.

[0090] In addition, by limiting the minimum value of the inner diameter dimension C of the third tab region 131, the first central hollow region 1541 can have enough space to accommodate the thermally expanded third tab 013, thereby avoiding the third tab 013 from intersecting and generating metal debris after thermal expansion.

[0091] In one embodiment, along the radial direction of the core 001, from the center of the core body 015 outward, a third pole ear region 131 and a first peripheral hollow ear region 1544 are sequentially provided at the second end.

[0092] It is understood that, in conjunction with the foregoing embodiments, optionally, along the radial direction of the core 001, from the center of the core body 015 outward, the second end is sequentially provided with a first central loop area 1541, a third pole loop area 131, and a first peripheral loop area 1544.

[0093] In this embodiment, by setting the first peripheral ear area 1544, the third ear 013 can be prevented from exceeding the outer periphery of the core body 015 after the third ear 013 is flattened, thereby controlling the radial dimension of the core 001 to facilitate the core 001 entering the shell.

[0094] In one embodiment, the outer diameter of the third tab region 131 is D, and the outer diameter of the core body 015 is A, satisfying: 65%A≤D≤80%A.

[0095] It is understood that the outer diameter D of the third electrode region 131 includes, but is not limited to, 65%A, 66.2%A, 68.3%A, 70%A, 72.1%A, 73.9%A, 74.5%A, 75%A, 77%A, 78.3%A, 78.5%A, 79%A, 79.5%A, and 80%A.

[0096] For example:

[0097] When A is 24mm, D may include, but is not limited to, 15.6mm, 15.86mm, 16.08mm, 16.13mm, 16.95mm, 17.11mm, 17.71mm, 18mm, 18.25mm, 18.38mm, 18.41mm, and 19.2mm.

[0098] When A is 30mm, D includes, but is not limited to, 19.5mm, 20.4mm, 20.86mm, 21.08mm, 21.95mm, 22.11mm, 22.71mm, 23mm, 23.25mm, 23.38mm, 23.41mm, and 24mm.

[0099] When A is 35mm, D includes, but is not limited to, 22mm, 23mm, 23.38mm, 24.52mm, 25.5mm, 26.08mm, 26.13mm, 26.95mm, 27.11mm, 27.71mm, and 28mm.

[0100] When A is 40mm, D includes, but is not limited to, 26.mm, 26.95mm, 27.11mm, 27.71mm, 28mm, 28.38mm, 28.81mm, 29.4mm, 29.75mm, 30.86mm, 31.08mm, and 32mm.

[0101] When A is 45.5mm, D includes, but is not limited to, 29.575mm, 30.86mm, 31.08mm, 31.13mm, 32.11mm, 32.71mm, 33mm, 34.25mm, 35.38mm, 36mm, and 36.4mm.

[0102] In this embodiment, the above-mentioned arrangement allows the outer periphery of the third tab region 131 and the outer periphery of the core 001 to be radially spaced along the core 001. This ensures that the bent third tab 013 is located within this gap and does not exceed the outer periphery of the core 001, thereby controlling the outer diameter of the core 001 and facilitating its smooth insertion into the housing. On the other hand, it avoids the gap between the outer periphery of the third tab region 131 and the outer periphery of the core 001 being too large, which would affect the area of ​​the third tab 013. This ensures that the current collection capacity and internal resistance of the third tab 013 meet the requirements.

[0103] Please see Figure 5 or Figure 6 , Figure 5 This is a schematic diagram showing the projected relationship between the third electrode 013 and the first electrode 011 before bending, provided in an embodiment of this application. Figure 6 This is a schematic diagram illustrating the projection relationship between the third electrode tab 013 and the second electrode tab 012 before bending, provided in an embodiment of this application. In one embodiment, the third electrode tab 013 is connected to the first electrode plate 151. The projection plane is a plane perpendicular to the axis of the core body 015, and the projection direction is the axial direction of the core body 015. In the projection plane, the projection of the first electrode tab 011 before bending at least partially overlaps with the projection of the third electrode tab 013 before bending, such as... Figure 5 As shown; or, the third electrode tab 013 is connected to the second electrode plate 152, with the plane perpendicular to the axis of the core body 015 as the projection plane and the axis of the core body 015 as the projection direction. In the projection plane, the projection of the second electrode tab 012 before bending and the projection of the third electrode tab 013 before bending at least partially overlap, as shown. Figure 6 As shown.

[0104] Optionally, the third electrode 013 is connected to the first electrode 151, and in the projection plane, the projection of the first electrode 011 before bending falls into the projection of the third electrode 013 before bending; or, the third electrode 013 is connected to the second electrode 152, and the projection of the second electrode 012 before bending falls into the projection of the third electrode 013 before bending.

[0105] Specifically, the projection of the root of the first electrode 011 falls within the projection of the root of the third electrode 013, or the projection of the root of the second electrode 012 falls within the projection of the root of the third electrode 013. The root of the electrode is the part where the electrode connects to the coating area.

[0106] In this embodiment, through the above-described arrangement, the third tab 013 and the first tab 011 or the second tab 012 connected to the same electrode sheet have portions opposite each other along the axial direction of the winding core 001. This allows the third tab 013 to collect current and then directly move along the axial direction of the winding core 001 to transfer the current to the first tab 011 or the second tab 012 connected to the same electrode sheet, thereby shortening the current collection path of the winding core 001. This improves the current collection capacity of the winding core 001.

[0107] Please see Figure 7 , Figure 7 This is a schematic diagram of the structure of another core 001 provided in an embodiment of this application. In one embodiment, the core 001 further includes a fourth electrode tab 014. The fourth electrode tab 014 is disposed at the second end of the core body 015, and one of the third electrode tab 013 and the fourth electrode tab 014 is connected to the first electrode plate 151, and the other is connected to the second electrode plate 152.

[0108] For example, the third electrode tab 013 is connected to the first electrode plate 151, and the fourth electrode tab 014 is connected to the second electrode plate 152. The first electrode tab 011 is located closer to the center of the winding core 001 than the second electrode tab 012, and the fourth electrode tab 014 is located closer to the center of the winding core 001 than the third electrode tab 013.

[0109] Furthermore, the first electrode 151 is the positive electrode, and the second electrode 152 is the negative electrode. Correspondingly, the first tab 011 is the positive tab, and the second tab 012 is the negative tab.

[0110] In this embodiment, by providing a first tab 011 and a second tab 012 at one end of the core 001 for positive and negative current collection respectively, and by providing a third tab 013 and a fourth tab 014 at the other end of the core 001 for positive and negative current collection respectively, the current collection area of ​​the two types of electrodes of the core 001 can be increased, thereby increasing the electron conduction path and improving the current collection capacity of the first electrode 151 and the second electrode 152. This further enhances the current collection capacity of the core 001.

[0111] Please see Figure 8 , Figure 8 This is a schematic diagram of the structure of another second end provided in an embodiment of this application. In one embodiment, multiple layers of third tabs 013 are bent and stacked to form a third tab region 131. Multiple layers of fourth tabs 014 are bent and stacked to form a fourth tab region 141. Along the radial direction of the core body 015, from the center of the core body 015 outward, the second end is sequentially provided with a fourth tab region 141, a first central loop ear region 1547, and a third tab region 131. The fourth tab region 141 and the third tab region 131 extend circumferentially along the core body 015 to form closed or open annular shapes, respectively.

[0112] It can be understood that the fourth tab area 141 can extend along the circumference of the core body 015 into a closed ring; the fourth tab area 141 can also extend along the circumference of the core body 015 into an open ring, that is, the fourth tab 014 extends along the circumference of the core body 015 into an arc-shaped segment. The arc-shaped segment can be one segment or multiple segments, and multiple arc-shaped segments are spaced apart along the circumference of the core body 015.

[0113] The insulation between the third tab 013 and the fourth tab 014 can be achieved through spatial insulation isolation via the first middle ring ear area 1547, or by setting an insulating component between the third tab 013 and the fourth tab 014.

[0114] In this embodiment, by extending the third tab 013 and the fourth tab 014 along the circumference of the core body 015, on the one hand, the connection length between the third tab 013 and the fourth tab 014 and the electrode sheet can be increased, thereby improving the connection strength between the third tab 013 and the fourth tab 014 and the electrode sheet, and thus improving the structural reliability of the core 001; on the other hand, the area of ​​the third tab 013 and the fourth tab 014 can be increased, thereby increasing the flow area of ​​the core 001, and thus improving the flow capacity of the core 001.

[0115] In addition, by setting the first middle ring ear area 1547, a gap can be made between the third ear 013 and the fourth ear 014 to provide expansion space for the third ear 013 and the fourth ear 014 to expand due to heat, so as to avoid excessive clamping force between the third ear 013 and the fourth ear 014 due to thermal expansion, thereby ensuring the reliability of the insulation between the third ear 013 and the fourth ear 014.

[0116] Please see Figure 8 In one embodiment, multiple layers of third tabs 013 are bent and stacked to form a third tab region 131. Multiple layers of fourth tabs 014 are bent and stacked to form a fourth tab region 141. Along the radial direction of the core body 015, from the center of the core body 015 outward, a third central hollow tab region 1543, a fourth tab region 141, and a third tab region 131 are sequentially provided at the second end. The fourth tab region 141 and the third tab region 131 extend along the circumference of the core body 015 in a closed or open annular shape, respectively.

[0117] In this embodiment, by setting a third central ear area 1543, the central hole of the core 001 can be avoided from being blocked by the fourth electrode ear 014, thereby improving the smoothness of the electrolyte flowing out of or into the central hole of the core 001, and thus ensuring the wetting efficiency of the core 001.

[0118] Please see Figure 8 In one embodiment, the inner diameter of the fourth tab region 141 is J, and the outer diameter of the core body 015 is A, satisfying: 3%A≤J≤22%A.

[0119] It is understood that the inner diameter J of the third electrode region 131 includes, but is not limited to, 3%A, 3.6%A, 43%A, 5%A, 6.2%A, 8.3%A, 10%A, 12.1%A, 13.9%A, 14.5%A, 15%A, 17%A, 18.3%A, 20%A, 21%A, 21.3%A, 21.5%A, and 22%A.

[0120] For example:

[0121] When A is 24mm, J may be, but is not limited to, 0.72mm, 0.86mm, 1.08mm, 1.65mm, 2.13mm, 2.95mm, 3.11mm, 3.71mm, 4.23mm, 5.25mm, 5.78mm, or 5.82mm.

[0122] When A is 30mm, J may be, but is not limited to, 0.9mm, 1.06mm, 2.78mm, 3.13mm, 3.85mm, 4.19mm, 5.21mm, 6.23mm, 6.25mm, 6.38mm, 6.59mm, or 6.6mm.

[0123] When A is 35mm, J may be, but is not limited to, 1.05mm, 2.06mm, 3.78mm, 4.13mm, 4.85mm, 5.19mm, 5.21mm, 6.23mm, 7.25mm, 7.38mm, 7.59mm, or 7.7mm.

[0124] When A is 40mm, J includes, but is not limited to, 1.2mm, 2.06mm, 3.78mm, 4.13mm, 5.85mm, 6.19mm, 7.21mm, 7.23mm, 7.75mm, 8.28mm, 8.5mm, and 8.8mm.

[0125] When A is 45.5mm, J includes, but is not limited to, 1.365mm, 2.06mm, 3.78mm, 4.13mm, 5.85mm, 6.19mm, 7.21mm, 8.23mm, 9.25mm, 9.88mm, 10mm, and 10.01mm.

[0126] In this embodiment, the above-mentioned limitations can, on the one hand, prevent the inner diameter J of the fourth tab region 141 from being too small, which would cause the fourth tab 014 to block the intermediate hole 016 of the core 001, thereby ensuring the smooth flow of electrolyte into or out of the intermediate hole 016, and thus ensuring the wetting efficiency of the core 001; on the other hand, can prevent the inner diameter J of the fourth tab region 141 from being too large, which would affect the radial dimension of the fourth tab 014, thereby ensuring not only the current collection area of ​​the fourth tab 014 to improve the current collection capacity of the core 001, but also the welding area of ​​the fourth tab 014, thereby improving the welding stability between the fourth tab 014 and the current collector plate.

[0127] In addition, by limiting the minimum value of the inner diameter J of the fourth tab region 141, the third central hollow region 1543 can have sufficient space to accommodate the fourth tab 014, thereby preventing the fourth tab 014 from bending and intersecting in the third central hollow region 1543 and generating metal debris.

[0128] Please see Figure 8 In one embodiment, multiple layers of third tabs 013 are bent and stacked to form a third tab region 131. Multiple layers of fourth tabs 014 are bent and stacked to form a fourth tab region 141. Along the radial direction of the core body 015, from the center of the core body 015 outward, a fourth tab region 141, a third tab region 131, and a third peripheral hollow tab region 1546 are sequentially provided at the second end. The fourth tab region 141 and the third tab region 131 extend circumferentially along the core body 015 as closed or open annular shapes, respectively.

[0129] It is understood that, in conjunction with the foregoing embodiments, optionally, along the radial direction of the core 001, from the center of the core body 015 outward, the second end is sequentially provided with a third central loop area 1543, a fourth pole loop area 141, a first central loop area 1547, a third pole loop area 131, and a third peripheral loop area 1546.

[0130] In this embodiment, by setting a third peripheral ear area 1546, the third ear 013 can be prevented from extending beyond the outer periphery of the core body 015 after it is flattened, thereby controlling the radial dimension of the core 001 to facilitate the core 001 entering the shell.

[0131] Please see Figure 8 In one embodiment, the outer diameter of the third tab region 131 is D, and the outer diameter of the core body 015 is A, satisfying: 85%A≤D<100%A.

[0132] It is understood that the outer diameter D of the third electrode region 131 includes, but is not limited to, 85%A, 86.2%A, 88.3%A, 90%A, 92.1%A, 93.9%A, 94.5%A, 95%A, 97%A, 98.3%A, 98.5%A, 99%A, 99.5%A, and 99.8%A.

[0133] For example:

[0134] When A is 24mm, D may include, but is not limited to, 20.4mm, 20.86mm, 21.08mm, 21.13mm, 21.95mm, 22.11mm, 22.71mm, 23mm, 23.25mm, 23.38mm, 23.41mm, and 23.5mm.

[0135] When A is 30mm, D includes, but is not limited to, 25.5mm, 2586mm, 26.08mm, 26.13mm, 26.95mm, 27.11mm, 27.71mm, 28mm, 28.25mm, 28.38mm, 28.81mm, and 29.4mm.

[0136] When A is 35mm, D includes, but is not limited to, 29.75mm, 30.86mm, 31.08mm, 31.13mm, 31.95mm, 32.11mm, 32.71mm, 33mm, 33.25mm, 33.38mm, 34mm, and 34.3mm; when A is 40mm, D includes, but is not limited to, 34mm, 34.86mm, 35.08mm, 35.13mm, and 35.95mm. m, 36.11mm, 36.71mm, 37mm, 38.25mm, 38.38mm, 39mm, 39.2mm; when A is 45.5mm, D includes, but is not limited to, 38.675mm, 39mm, 39.08mm, 40.13mm, 40.95mm, 41.11mm, 41.71mm, 42mm, 43.25mm, 43.38mm, 44mm, 44.59mm.

[0137] In this embodiment, the above-mentioned arrangement allows the outer periphery of the third tab region 131 and the outer periphery of the core 001 to be radially spaced along the core 001. This ensures that the bent third tab 013 is located within this gap and does not exceed the outer periphery of the core 001, thereby controlling the outer diameter of the core 001 and facilitating its smooth insertion into the housing. On the other hand, it avoids the gap between the outer periphery of the third tab region 131 and the outer periphery of the core 001 being too large, which would affect the area of ​​the third tab 013. This ensures that the current collection capacity and internal resistance of the third tab 013 meet the requirements.

[0138] Please see Figure 8 In one embodiment, the outer diameter of the core body 015 is A, the outer diameter of the fourth tab region 141 is I, satisfying: 25%A≤I≤35%A; and / or, the inner diameter of the third tab region 131 is C, satisfying: 40%A≤C≤75%A.

[0139] Specifically, the outer diameter of the fourth tab region 141 is I, satisfying: 25%A≤I≤35%A, or the inner diameter of the third tab region 131 is C, satisfying: 40%A≤C≤75%A, or the outer diameter of the fourth tab region 141 is I, satisfying: 25%A≤I≤35%A, and the inner diameter of the third tab region 131 is C, satisfying: 40%A≤C≤75%A.

[0140] Among them, the outer diameter dimension I of the fourth pole ear region 141 includes, but is not limited to, 25%A, 25.5%A, 25.9%A, 26%A, 26.8%A, 27%A, 27.33%A, 28%A, 30%A, 31%A, 32%A, 33%A, 34%A, 34.5%A, and 35%A.

[0141] For example:

[0142] When A is 24mm, I includes, but is not limited to, 6mm, 6.06mm, 6.2mm, 6.5mm, 6.95mm, 7.11mm, 7.21mm, 7.3mm, 7.5mm, 7.8mm, 8.02mm, and 8.4mm.

[0143] When A is 30mm, I includes, but is not limited to, 7.5mm, 7.6mm, 8.2mm, 8.5mm, 8.95mm, 9.11mm, 9.21mm, 9.3mm, 9.5mm, 9.8mm, 10.41mm, and 10.5mm.

[0144] When A is 35mm, I includes, but is not limited to, 8.75mm, 8.9mm, 9.2mm, 9.5mm, 9.95mm, 10.11mm, 10.21mm, 10.8mm, 11.05mm, 11.8mm, 12mm, and 12.25mm;

[0145] When A is 40mm, I includes, but is not limited to, 10mm, 10.1mm, 10.2mm, 10.5mm, 10.95mm, 11.11mm, 11.21mm, 11.8mm, 12.05mm, 12.8mm, 13mm, and 14mm.

[0146] When A is 45.5mm, I includes, but is not limited to, 11.375mm, 12.1mm, 12.2mm, 12.5mm, 12.95mm, 13.11mm, 13.21mm, 13.6mm, 13.65mm, 13.8mm, 15mm, and 15.925mm.

[0147] In addition, the inner diameter C of the third pole ear region includes, but is not limited to, 40%A, 45.5%A, 50%A, 53.33%A, 55.9%A, 56%A, 58%A, 60%A, 63%A, 65%A, 68%A, 70%A, 71%A, 74.2%A, and 75%A.

[0148] For example:

[0149] When A is 24mm, C includes, but is not limited to, 9.6mm, 10.06mm, 11.2mm, 12.5mm, 12.95mm, 13.11mm, 14.21mm, 15.3mm, 16.5mm, 16.8mm, 17.41mm, and 18mm.

[0150] When A is 30mm, C includes, but is not limited to, 12mm, 13.6mm, 14.2mm, 15.5mm, 16.95mm, 17.11mm, 17.21mm, 18.3mm, 19.5mm, 20.8mm, 21.41mm, and 22.5mm.

[0151] When A is 35mm, C includes, but is not limited to, 14mm, 15.9mm, 16.2mm, 17.5mm, 18.95mm, 20.11mm, 21.21mm, 22.8mm, 23.05mm, 24.8mm, 25mm, and 26.25mm.

[0152] When A is 40mm, C includes, but is not limited to, 16mm, 17.1mm, 18.2mm, 19.5mm, 20.95mm, 22.11mm, 23.21mm, 24.8mm, 26.05mm, 27.8mm, 29mm, and 30mm.

[0153] When A is 45.5mm, C includes, but is not limited to, 18.2mm, 19.1mm, 20.2mm, 21.5mm, 22.95mm, 23.11mm, 25.21mm, 26.8mm, 30.05mm, 31.8mm, 34mm, and 34.125mm.

[0154] In this embodiment, by limiting the outer diameter I of the fourth tab region 141, the outer diameter of the fourth tab region 141 can be prevented from being too large and affecting the arrangement of the third tab region 131; by limiting the inner diameter C of the third tab region 131, the inner diameter can be prevented from being too small and affecting the arrangement of the fourth tab 014; and by limiting the outer diameter I of the fourth tab region 141 and the inner diameter C of the third tab region 131, there can be a sufficient gap between the fourth tab 014 and the third tab 013, so that the fourth tab 014 and the third tab can be insulated and isolated through the gap, or an insulating element can be provided in the gap.

[0155] In addition, by combining the restrictions on the inner diameter of the fourth tab region 141 and the outer diameter of the third tab region 131 in the aforementioned embodiments, the third tab 013 and the fourth tab 014 can meet the current collection requirements of the winding core 001 and have suitable internal resistance.

[0156] Please see Figure 4 In one embodiment, the third tab 013 is connected to the first tab 151. Taking the plane perpendicular to the axis of the core body 015 as the projection plane and the axial direction of the core body 015 as the projection direction, the projection of the first tab 011 before bending and the projection of the third tab 013 before bending partially overlap in the projection plane.

[0157] The first tab 011 is positioned closer to the center of the core 001 than the second tab 012. The fourth tab 014 is positioned closer to the center of the core 001 than the third tab 013. Along the axial direction of the core 001, the side of the first tab region 111 near the outer periphery of the core 001 is positioned opposite the side of the third tab region 131 near the center of the core 001.

[0158] In this embodiment, the above-described arrangement allows for a portion of the third tab 013 and the first tab 011 that are axially opposite each other along the winding core 001. This allows the third tab 013 to directly transfer current to the first tab 011 by moving axially along the winding core 001 after collecting current, thereby shortening the current collection path of the winding core 001. This improves the current collection capacity of the winding core 001.

[0159] Please see Figure 9 , Figure 9 This is a schematic diagram showing the projection relationship between the fourth electrode tab 014 and the second electrode tab 012 before bending, according to an embodiment of this application. In one embodiment, the fourth electrode tab 014 is connected to the second electrode plate 152. Taking a plane perpendicular to the axis of the core body 015 as the projection plane and the axial direction of the core body 015 as the projection direction, the projection of the second electrode tab 012 before bending and the projection of the fourth electrode tab 014 before bending at least partially overlap in the projection plane.

[0160] It is understandable that the projection of the root of the second electrode 012 overlaps with the projection of the root of the fourth electrode 014.

[0161] The first tab 011 is positioned closer to the center of the core 001 than the second tab 012. The fourth tab 014 is positioned closer to the center of the core 001 than the third tab 013. Along the axial direction of the core 001, the side of the fourth tab region 141 near the outer periphery of the core 001 is positioned opposite the side of the second tab region 121 near the center of the core 001.

[0162] In this embodiment, the above-described arrangement allows for a portion of the fourth tab 014 and the second tab 012 that are axially opposite each other along the winding core 001. This allows the fourth tab 014 to directly transfer current to the second tab 012 after collecting current, thus shortening the current collection path of the winding core 001. Consequently, the current collection capacity of the winding core 001 can be improved.

[0163] Please see Figure 10 , Figure 10This is a schematic diagram of the structure of the first end provided in an embodiment of this application. In one embodiment, multiple layers of first tabs 011 are bent and stacked to form a first tab region 111. Multiple layers of second tabs 012 are bent and stacked to form a second tab region 121. Along the radial direction of the core body 015, from the center of the core body 015 outward, the first end is sequentially provided with a first tab region 111, a second central loop tab region 1548, and a second tab region 121. The first tab region 111 and the second tab region 121 extend circumferentially along the core 001 as closed or open annular shapes, respectively.

[0164] Among them, the first tab region 111 and the second tab region 121 can extend in a closed ring along the circumference of the core body 015, such as Figure 10 As shown; the first tab area 111 and the second tab area 121 can also extend in an open ring along the circumference of the core body 015, that is, the first tab area 111 and the second tab area 121 extend in an arc-shaped segment along the circumference of the core body 015. The arc-shaped segment can be one segment or multiple segments, and multiple arc-shaped segments are arranged at intervals along the circumference of the core body 015.

[0165] In this embodiment, by extending the first tab area 111 and the second tab area 121 along the circumference of the core body 015, not only can the connection length between the first tab 011 and the first electrode 151 and the connection length between the second tab 012 and the second electrode 152 be increased, thereby improving the positional stability of the first tab 011 and the second tab 012; the area of ​​the first tab 011 and the second tab 012 can also be increased, thereby improving the current collection capacity of the first tab 011 and the second tab 012, and thus improving the current collection capacity of the core 001.

[0166] Please see Figure 10 In one embodiment, multiple layers of first tabs 011 are bent and stacked to form a first tab region 111. Multiple layers of second tabs 012 are bent and stacked to form a second tab region 121. Along the radial direction of the core body 015, from the center of the core body 015 outward, a second central hollow tab region 1542, a first tab region 111, and a second tab region 121 are sequentially provided at the first end.

[0167] In this embodiment, by setting a second central ear area 1542, the first electrode ear 011 can be prevented from blocking the middle hole of the core 001, thereby ensuring the smooth flow of electrolyte into or out of the middle hole, and thus ensuring the wetting efficiency of the core 001.

[0168] Please see Figure 10 In one embodiment, the inner diameter of the first tab region 111 is M, and the outer diameter of the core body 015 is A, satisfying: 3%A≤M≤22%A.

[0169] It is understood that the inner diameter M of the third electrode region 131 includes, but is not limited to, 3%A, 3.6%A, 43%A, 5%A, 6.2%A, 8.3%A, 10%A, 12.1%A, 13.9%A, 14.5%A, 15%A, 17%A, 18.3%A, 20%A, 21%A, 21.3%A, 21.5%A, and 22%A.

[0170] For example:

[0171] When A is 24mm, M includes, but is not limited to, 0.72mm, 0.86mm, 1.08mm, 1.65mm, 2.13mm, 2.95mm, 3.11mm, 3.71mm, 4.23mm, 5.25mm, 5.78mm, and 5.82mm.

[0172] When A is 30mm, M includes, but is not limited to, 0.9mm, 1.06mm, 2.78mm, 3.13mm, 3.85mm, 4.19mm, 5.21mm, 6.23mm, 6.25mm, 6.38mm, 6.59mm, and 6.6mm.

[0173] When A is 35mm, M includes, but is not limited to, 1.05mm, 2.06mm, 3.78mm, 4.13mm, 4.85mm, 5.19mm, 5.21mm, 6.23mm, 7.25mm, 7.38mm, 7.59mm, and 7.7mm.

[0174] When A is 40mm, M includes, but is not limited to, 1.2mm, 2.06mm, 3.78mm, 4.13mm, 5.85mm, 6.19mm, 7.21mm, 7.23mm, 7.75mm, 8.28mm, 8.5mm, and 8.8mm.

[0175] When A is 45.5mm, M includes, but is not limited to, 1.365mm, 2.06mm, 3.78mm, 4.13mm, 5.85mm, 6.19mm, 7.21mm, 8.23mm, 9.25mm, 9.88mm, 10mm, and 10.01mm.

[0176] In this embodiment, the above-mentioned limitations can, on the one hand, prevent the inner diameter M of the first tab region 111 from being too small, which would cause the first tab 011 to block the intermediate hole 016 of the core 001, thereby ensuring the smooth flow of electrolyte into or out of the intermediate hole 016, and thus ensuring the wetting efficiency of the core 001; on the other hand, can prevent the inner diameter M of the first tab region 111 from being too large, which would affect the radial dimension of the first tab 011, thereby ensuring not only the current collection area of ​​the first tab 011 to improve the current collection capacity of the core 001, but also the welding area of ​​the first tab 011, thereby improving the welding stability between the first tab 011 and the current collector plate.

[0177] In addition, by limiting the minimum value of the inner diameter dimension M of the first tab region 111, the second central hollow region 1542 can have a sufficient space to accommodate the thermally expanded first tab 011, thereby avoiding the generation of metal debris in the second central hollow region 1542 after the first tab 011 expands due to heat.

[0178] Please see Figure 10 In one embodiment, multiple layers of first tabs 011 are bent and stacked to form a first tab region 111. Multiple layers of second tabs 012 are bent and stacked to form a second tab region 121. Along the radial direction of the core body 015, from the center of the core body 015 outward, a first tab region 111, a second tab region 121, and a second peripheral loop region 1545 are sequentially provided at the first end.

[0179] In conjunction with the foregoing embodiments, optionally, along the radial direction of the core 001, from the center of the core body 015 outward, the second end is sequentially provided with a second central loop area 1542, a first pole loop area 111, a second middle loop area 1548, a second pole loop area 121 and a second peripheral loop area 1545.

[0180] In this embodiment, by setting a second peripheral ear area 1545, the second ear 012 can be prevented from extending beyond the outer periphery of the core body 015 after it is flattened, thereby controlling the radial dimension of the core 001 to facilitate the core 001 entering the shell.

[0181] Please see Figure 10 In one embodiment, the outer diameter of the second tab region 121 is E, and the outer diameter of the core body 015 is A, satisfying: 85%A≤E<100%A.

[0182] It is understood that the outer diameter E of the second tab region 121 includes, but is not limited to, 85%A, 86.2%A, 88.3%A, 90%A, 92.1%A, 93.9%A, 94.5%A, 95%A, 97%A, 98.3%A, 98.5%A, 99%A, 99.5%A, and 99.8%A.

[0183] For example:

[0184] When A is 24mm, E includes, but is not limited to, 20.4mm, 20.86mm, 21.08mm, 21.13mm, 21.95mm, 22.11mm, 22.71mm, 23mm, 23.25mm, 23.38mm, 23.41mm, and 23.52mm.

[0185] When A is 30mm, E includes, but is not limited to, 25.5mm, 2586mm, 26.08mm, 26.13mm, 26.95mm, 27.11mm, 27.71mm, 28mm, 28.25mm, 28.38mm, 28.81mm, and 29.4mm.

[0186] When A is 35mm, E includes, but is not limited to, 29.75mm, 30.86mm, 31.08mm, 31.13mm, 31.95mm, 32.11mm, 32.71mm, 33mm, 33.25mm, 33.38mm, 34mm, and 34.3mm; when A is 40mm, E includes, but is not limited to, 34mm, 34.86mm, 35.08mm, 35.13mm, and 35.95mm. m, 36.11mm, 36.71mm, 37mm, 38.25mm, 38.38mm, 39mm, 39.2mm; when A is 45.5mm, E includes, but is not limited to, 38.675mm, 39mm, 39.08mm, 40.13mm, 40.95mm, 41.11mm, 41.71mm, 42mm, 43.25mm, 43.38mm, 44mm, 44.59mm.

[0187] In this embodiment, the above-mentioned arrangement allows the outer periphery of the second tab region 121 and the outer periphery of the core 001 to be radially spaced along the core 001. This ensures that the bent second tab 012 is located within this gap and does not exceed the outer periphery of the core 001, thereby controlling the outer diameter of the core 001 and facilitating its smooth insertion into the housing. On the other hand, it prevents the gap between the outer periphery of the second tab region 121 and the outer periphery of the core 001 from being too large, which would affect the area of ​​the second tab 012. This ensures that the current collection capacity and internal resistance of the second tab 012 meet the requirements.

[0188] In one embodiment, the outer diameter of the core body 015 is A, the outer diameter of the first tab region 111 is G, satisfying: 35%A≤G≤50%A; and / or, the inner diameter of the second tab region 121 is F, satisfying: 60%A≤F≤75%A.

[0189] Specifically, the outer diameter G of the first tab region 111 satisfies: 35%A≤G≤50%A; or, the inner diameter F of the second tab region 121 satisfies: 60%A≤F≤75%A; or, the outer diameter G of the first tab region 111 satisfies: 35%A≤G≤50%A, and the inner diameter F of the second tab region 121 satisfies: 60%A≤F≤75%A.

[0190] The outer diameter G of the first tab region 111 includes, but is not limited to, 35%A, 35.5%A, 36.9%A, 37%A, 38.8%A, 40%A, 42.33%A, 44.8%A, 45%A, 46.1%A, 47.2%A, 48.3%A, 49.4%A, 49.5%A, and 50%A.

[0191] For example:

[0192] When A is 24mm, G includes, but is not limited to, 8.4mm, 8.9mm, 9.2mm, 9.5mm, 9.95mm, 10.11mm, 10.21mm, 10.8mm, 11.05mm, 11.8mm, 11.9mm, and 12mm.

[0193] When A is 30mm, G includes, but is not limited to, 10.5mm, 10.95mm, 11.11mm, 11.21mm, 11.8mm, 12.05mm, 12.8mm, 13mm, 14mm, 14.5mm, 14.8mm, and 15mm.

[0194] When A is 35mm, G includes, but is not limited to, 12.25mm, 12.95mm, 13.11mm, 13.21mm, 13.8mm, 13.9mm, 15mm, 15.925mm, 16.05mm, 16.8mm, 17mm, and 17.5mm.

[0195] When A is 40mm, G includes, but is not limited to, 14mm, 14.1mm, 15.2mm, 16mm, 16.95mm, 17.11mm, 17.61mm, 18mm, 18.05mm, 18.8mm, 19mm, and 20mm.

[0196] When A is 45.5mm, G includes, but is not limited to, 15.925mm, 16.1mm, 16.2mm, 16.5mm, 17mm, 17.11mm, 17.8mm, 18.05mm, 18.8mm, 19mm, 20mm, and 22.75mm.

[0197] In addition, the inner diameter F of the second tab region 121 includes, but is not limited to, 60%A, 61.5%A, 63%A, 64.33%A, 65.9%A, 66%A, 68%A, 69%A, 70.3%A, 71.5%A, 72.8%A, 73%A, 74%A, 74.2%A, and 75%A.

[0198] For example:

[0199] When A is 24mm, F includes, but is not limited to, 14.4mm, 14.6mm, 14.92mm, 15mm, 15.15mm, 15.81mm, 16mm, 16.3mm, 16.5mm, 16.8mm, 17.41mm, and 18mm.

[0200] When A is 30mm, F includes, but is not limited to, 18mm, 18.1mm, 18.2mm, 18.5mm, 19mm, 19.11mm, 19.21mm, 20.3mm, 10.5mm, 21.8mm, 21.91mm, and 22.5mm.

[0201] When A is 35mm, F includes, but is not limited to, 21mm, 21.9mm, 22.2mm, 22.5mm, 22.95mm, 23.11mm, 24.21mm, 24.8mm, 25.05mm, 25.8mm, 26mm, and 26.25mm.

[0202] When A is 40mm, F includes, but is not limited to, 24mm, 24.1mm, 25.2mm, 26.5mm, 26.95mm, 27.11mm, 27.21mm, 27.8mm, 28.05mm, 28.8mm, 29mm, and 30mm.

[0203] When A is 45.5mm, F includes, but is not limited to, 27.3mm, 28.1mm, 29.2mm, 29.5mm, 29.95mm, 30.11mm, 31.21mm, 31.8mm, 32.05mm, 33.8mm, 34mm, and 34.125mm.

[0204] In this embodiment, by limiting the outer diameter G of the first tab region 111, the outer diameter of the first tab region 111 can be prevented from being too large and affecting the arrangement of the second tab region 121; by limiting the inner diameter F of the second tab region 121, the inner diameter can be prevented from being too small and affecting the arrangement of the first tab 011; and by limiting the outer diameter G of the first tab region 111 and the inner diameter F of the second tab region 121, there can be a sufficient gap between the first tab 011 and the second tab 012, so that the first tab 011 and the second tab can be insulated and isolated through the gap, or an insulating element can be provided in the gap.

[0205] In addition, by combining the restrictions on the inner diameter of the first tab region 111 and the outer diameter of the second tab region 121 in the aforementioned embodiments, the first tab 011 and the second tab 012 can meet the current collection requirements of the winding core 001 and have suitable internal resistance.

[0206] Optionally, the third tab 013 is connected to the first electrode 151, and the inner diameter C of the third tab region 131 is not greater than the outer diameter G of the first tab region 111. Therefore, after the third tab 013 collects current, it can directly move along the axial direction of the winding core 001 to transfer the current to the first tab 011, thereby shortening the current collection path and enhancing the current collection effect.

[0207] Similarly, the fourth tab 014 is connected to the second tab 152, and the inner diameter F of the second tab region 121 is not greater than the outer diameter I of the fourth tab region 141. Therefore, after the fourth tab 014 collects current, it can directly move along the axial direction of the winding core 001 to transfer the current to the second tab 012, thereby shortening the current collection path and enhancing the current collection effect.

[0208] In one embodiment, FG ≥ 4 mm.

[0209] For example, the difference between the inner diameter F of the second tab region 121 and the outer diameter G of the first tab region 111 includes, but is not limited to, 4mm, 4.1mm, 4.3mm, 4.4mm, 4.5mm, 4.6mm, 4.8mm, and 5mm.

[0210] In this embodiment, the above-mentioned limitations allow for a minimum 4mm gap between the inner diameter F of the second tab region 121 and the outer diameter G of the first tab region 111, so that the first tab 011 and the second tab can be insulated and isolated by this gap, or so that the gap provides sufficient space for installing insulating components, thereby improving the convenience of configuring insulating components.

[0211] In one embodiment, the outer diameter of the second tab region 121 is E, and the inner diameter of the second tab region 121 is F, satisfying: EF≥4mm.

[0212] For example, the difference between the outer diameter E of the second tab region 121 and the inner diameter F of the second tab region 121 includes, but is not limited to, 4mm, 4.1mm, 4.3mm, 4.4mm, 4.5mm, 4.6mm, 4.8mm, and 5mm.

[0213] In this embodiment, the above-mentioned limitations allow the second tab 012 to have a sufficient area, which not only enables the current collection capacity of the second tab 012 to meet the current collection requirements of the core 001, but also allows the second tab 012 to have a suitable welding area, thereby improving the ease of operation of welding the second tab 012 to the current collector plate.

[0214] Please see Figure 11 , Figure 11 This is a schematic diagram of the structure of a battery cell 003 provided in an embodiment of this application. Accordingly, an embodiment of this application provides a battery cell 003, which includes a housing 031 and the aforementioned winding core 001. The housing 031 has a receiving cavity. The winding core 001 is disposed in the receiving cavity.

[0215] It is understood that the battery cell 003 also includes a housing 031 and a cover plate 032. The housing 031 and the cover plate 032 cover each other to form a receiving cavity, in which the core 001 is disposed.

[0216] In this embodiment, by using the aforementioned core 001, the current transmission inside the cell 003 can be smoother, the charging and discharging efficiency of the cell 003 can be higher, and the energy loss can be smaller.

[0217] In addition, by using the aforementioned core 001, at least one polarity of the electrode of the cell 003 can be used as an output terminal at both ends, thereby improving the operability of the electrical connection of the cell 003.

[0218] Please see Figure 12 , Figure 12 This is a schematic diagram of the structure of a battery pack 004 provided in an embodiment of this application. The battery pack 004 includes a battery case 041 and the aforementioned battery cells 003. The battery case 041 has a receiving cavity. Multiple battery cells 003 are disposed within the receiving cavity.

[0219] In this embodiment, by using the aforementioned cell 003, the current transmission inside the battery pack 004 can be smoother, the charging and discharging efficiency of the battery pack 004 can be higher, and the energy loss can be smaller.

[0220] Please see Figure 13 , Figure 13This is a schematic diagram of the structure of an electrical device 005 provided in an embodiment of this application. An embodiment of this application provides an electrical device 005, which includes the aforementioned battery cell 003 or battery pack 004, wherein the battery pack 004 or battery cell 003 supplies power to the electrical device.

[0221] It is understood that electrical equipment 005 includes, but is not limited to, electric toys, power tools, electric vehicles, automobiles, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc. Automobiles can include gasoline-powered cars, natural gas-powered cars, and new energy vehicles.

[0222] In this embodiment, by using the aforementioned battery pack 004, the charging efficiency of the electrical device 005 can be improved, the energy utilization rate of the electrical device 005 can be increased, and the energy loss of the electrical device 005 can be reduced.

[0223] The technical solutions and effects of this application will be described in detail below through specific embodiments. The following embodiments are only some embodiments of this application and are not intended to limit this application.

[0224] This embodiment aims to examine the impact of applying the winding core to the battery on battery performance.

[0225] The specific details of the test content for the embodiment are as follows:

[0226] I. Test-related instructions

[0227] The following test method is the DCR test, namely, the Direct Current Resistance test.

[0228] The equipment used for testing is a power battery tester, model CTE-8008-5V200A.

[0229] The test environment temperature was 25±2℃.

[0230] The main operation process of the test is as follows:

[0231] First, the nominal capacity is set at 1C = 32.4A, and the standard charge / discharge capacity is set at 1 / 3C, i.e., 10.8Ah. The average value of the actual capacitance measured after 3 charge / discharge cycles is taken as the calibrated capacity C0.

[0232] C0=(∑I n *T n +∑I' n *T' n ) / 6,

[0233] In this formula: n is a natural number, and n∈(1,3);

[0234] I n This is the charging current for the nth time;

[0235] T n The charging time is the nth time.

[0236] I' n This is the discharge current for the nth time;

[0237] T' n The nth discharge time is denoted as .

[0238] Then charge the cell to 4.25V with a constant current and constant voltage of 1 / 3C, and cut off the current of 0.05C; then adjust the state of charge of the cell to 50% SOC with a discharge current of 1 / 3C0, and let the cell stand for 1 hour.

[0239] Next, with the cell at 50% SOC, it was discharged at a constant current of 2C0 for 30 seconds, and the voltage difference δU of the cell before and after discharge was recorded. 放电 and discharge current value I 放电 And according to the formula: DCR 放电 =δU 放电 / I 放电 The battery charging DCR was obtained when the cell's state of charge was 50%;

[0240] Meanwhile, with the battery cell at 50% SOC, it was charged at a constant current of 2C0 for 30 seconds, and the voltage difference δU before and after charging was recorded. 充电 and charging current value I 充电 And according to the formula: DCR 充电 =δU 充电 / I 充电 The discharge discharge rate (DCR) of the battery was obtained when the cell's state of charge (SOC) was 50%.

[0241] II. Test Results

[0242] The test results were all based on cells with an outer core diameter A of 45.1 mm, a core center hole diameter of 5 mm, a core height of 88.3 ± 0.3 mm, and a core axial dimension of 4-5 mm before the tabs were bent.

[0243] 2.1 Setting up a control group

[0244] The control group consists of battery cells from related technologies that only have positive and negative tabs at the first end. Test data is as follows:

[0245]

[0246] Table 1. Parameters and validation results of control groups 1 and 2

[0247] According to Table 1,

[0248] (1) In control group 1, the positive electrode tab was located at the same end of the winding core, and the area of ​​the positive electrode tab was 1002.4 mm². 2 The negative electrode area is 1067.6 mm². 2 With the cell at 50% SOC, the battery charging DCR is 3.72mΩ and the battery discharging DCR is 3.69mΩ.

[0249] (2) In control group 2, the positive electrode tab was located at the same end of the winding core, and the area of ​​the positive electrode tab was 235 mm². 2 The negative electrode tab has an area of ​​1067.6 mm². 2 At that time, with the cell's state of charge at 50%, the battery charging DCR was 4.18mΩ and the battery discharging DCR was 3.95mΩ.

[0250] 2.2 Based on the control group, the parameter settings of the core were varied using the single variable method. The variable parameter tables and verification results of each embodiment are shown in Tables 3 to 5.

[0251] 2.21 Under the premise that the rest of the structure is the same, a third electrode tab is added to the second end of the core. The third electrode tab is the positive electrode tab.

[0252] Based on the formulas: 3%A≤C≤30%A and 65%A≤D≤80%A, the ranges of the inner and outer diameters of the third electrode region formed by bending and stacking the positive electrode tabs are as follows: Inner diameter C of the positive electrode tab: 1.353mm≤C≤13.53mm; Outer diameter D of the positive electrode tab: 29.315mm≤D≤36.08mm. The area of ​​the negative electrode tab remains unchanged, and the total area of ​​the positive electrode tabs is 1002.4mm². 2 and 999.9mm 2 Correspondingly, C is selected as 3mm and 13.5mm, and D as 31.4mm and 34mm.

[0253] Based on the above, the test data is as follows:

[0254]

[0255] Table 2. Parameters and verification results of the bottom positive electrode tab

[0256] Comparing Table 2 and Table 1, we can draw the following conclusions:

[0257] (1) The total area of ​​the positive electrode tab in control group 1 was the same as that in example 1, both being 1002.4 mm². 2The total area of ​​the negative electrode tab in control group 1 was the same as that in example 1, both being 1067.6 mm². 2 However, the battery charging DCR of control group 1 was 3.72 mΩ and the battery discharging DCR was 3.69 mΩ; the battery charging DCR of example 1 was 3.56 mΩ and the battery discharging DCR was 3.68 mΩ. Therefore, it can be seen that the battery charging DCR of example 1 is lower than that of control group 1, and the battery discharging DCR of example 1 is also lower than that of control group 1.

[0258] Therefore, under the premise that the total area of ​​the positive and negative tabs are equal, placing the positive tab at the first end and the second end respectively can reduce the charging DCR of the battery and help reduce the discharging DCR of the battery, thereby improving the overcurrent capacity.

[0259] (2) The total area of ​​the negative electrode tab in Example 2 is the same as that in Control Group 1, both being 1067.6 mm². 2 The total area of ​​the positive electrode tab in Example 2 is 999.9 mm². 2 Its total positive electrode area was lower than that of control group 1 (1002.4 mm²). 2 However, the battery charging DCR of Example 2 was 3.51 mΩ, which was lower than the battery charging DCR of Control Group 1 (3.72 mΩ), and the battery discharging DCR of Example 2 was 3.64 mΩ, which was lower than the battery discharging DCR of Control Group 1 (3.68 mΩ).

[0260] Therefore, under the premise that the total area of ​​the negative tabs is equal, placing the positive tabs at both ends of the winding core, compared to placing the positive tabs only at one end of the winding core, can still reduce the charging DCR of the battery and help reduce the discharging DCR of the battery, thereby improving the overcurrent capacity, even if the total area of ​​the positive tabs in the former is slightly lower than that in the latter.

[0261] (3) According to the comparison of Example 1 or Example 2 and Control Group 2, it can be seen that under the premise that the positive electrode tab and the negative electrode tab provided at the first end of the winding core have equal areas, the positive electrode tab provided at the second end of the winding core to increase the total area of ​​the positive electrode tab can reduce the charging DCR of the battery and help reduce the discharging DCR of the battery, thereby improving the overcurrent capacity.

[0262] (4) According to the comparison of Example 1 and Example 2, the larger the area of ​​the positive electrode tab at the second end of the winding core, the larger the total area of ​​the positive electrode tab, and correspondingly, the smaller the battery charging DCR and battery discharging DCR, thereby improving the overcurrent capacity.

[0263] 2.22 Under the premise that the rest of the structure is the same, a third electrode tab is added to the second end of the core, and the third electrode tab is a positive electrode tab. At the same time, the inner diameter of the third electrode tab area is reduced so that the area of ​​the positive electrode tab increases sequentially. The test data are as follows:

[0264]

[0265] Table 3. Parameters and verification results for the bottom positive electrode tab

[0266] As shown in Table 3, with the positive and negative electrode areas at the first end remaining constant, as the area of ​​the positive electrode at the second end increases from 874.2 mm²... 2 The diameter increases sequentially to 938.5 mm. 2 1067.6mm 2 The battery charging DCR decreased from 3.45mΩ to 3.25mΩ and 3.06mΩ respectively, and the battery discharging DCR decreased from 3.35mΩ to 3.30mΩ and 3.15mΩ respectively.

[0267] Therefore, by increasing the area of ​​the positive tab at the second end, the total area of ​​the positive tab will be increased, which will reduce the charging DCR of the battery and help reduce the discharging DCR of the battery, thereby improving the overcurrent capacity.

[0268] 2.23 Based on the aforementioned embodiments, a fourth electrode tab is added to the second end of the winding core. The fourth electrode tab is a negative electrode tab, and the area of ​​the negative electrode tab increases sequentially.

[0269] Based on the formulas: 40%A≤C≤75%A and 85%A≤D<100%A, the ranges of the inner and outer diameters of the third electrode region formed by the stacked positive electrode tabs are as follows: inner diameter C of the positive electrode tab: 18.4mm≤C≤33.825mm, outer diameter D of the positive electrode tab: 38.353mm≤D<45.1mm. Specifically, C is selected as 33mm, 28mm, 25mm, and 22.5mm, and D is selected as 45mm, 42mm, 40mm, and 38.5mm.

[0270] According to the formulas: 3%A≤J≤22%A and 25%A≤I≤35%A, the ranges of the inner and outer diameters of the fourth electrode region formed by the stacked negative electrode tabs are as follows: inner diameter J of the negative electrode tab: 1.353mm≤J≤9.922mm, outer diameter I of the negative electrode tab: 11.275mm≤I<15.785mm. Where I is selected as 12mm, 13mm, 14mm, and 15mm respectively, and J is 8mm, correspondingly, the area of ​​the negative electrode tab at the second end is 64.2mm². 2 82.4mm 2 103.6mm 2 126.3mm 2 .

[0271] Based on the above, the test data is as follows:

[0272]

[0273] Table 4. Parameters and verification results of the negative electrode tab at the bottom.

[0274] Based on Table 4, the following conclusions can be drawn:

[0275] A comparison of Examples 6, 7, 8, and 9 shows that, assuming the areas of the positive and negative electrodes at the first end are equal, and the area of ​​the positive electrode tab at the second end is equal, the area of ​​the negative electrode tab at the second end increases from 62.4 mm² in Example 6. 2 The diameter was increased sequentially to 82.4 mm in Example 7. 2 Example 8, 103.6mm 2 And 126.3mm in Example 9 2 During this period, the battery discharge DCR decreased sequentially from 3.32 mΩ in Example 6 to 3.27 mΩ in Example 7, 3.18 mΩ in Example 8, and 2.95 mΩ in Example 9; correspondingly, the battery charge DCR decreased sequentially from 3.43 mΩ in Example 6 to 3.39 mΩ in Example 7, 3.35 mΩ in Example 8, and 3.30 mΩ in Example 9.

[0276] Therefore, by increasing the area of ​​the negative tab at the second end, the total area of ​​the negative tab can be increased, thereby reducing the battery discharge DCR and helping to reduce the battery charging DCR, thus improving the overcurrent capacity.

[0277] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A type of winding core, characterized in that, include: The core body includes a first electrode, a second electrode, and a diaphragm disposed between the first electrode and the second electrode. The first electrode and the second electrode have opposite polarities. Along the axial direction of the core, the core body has a first end and a second end. A first electrode tab is disposed at the first end and connected to the first electrode plate; The second electrode tab is disposed at the first end and connected to the second electrode plate; A third electrode tab is disposed at the second end, and the third electrode tab is connected to the first electrode or the second electrode.

2. The winding core according to claim 1, characterized in that, The multiple layers of the third tab are bent and stacked to form a third tab region, which extends along the circumference of the core body in a closed or open ring shape.

3. The winding core according to claim 2, characterized in that, Along the radial direction of the core, from the center of the core body outward, the second end is sequentially provided with a first central loop area and a third pole loop area.

4. The winding core according to claim 3, characterized in that, The inner diameter of the third tab area is C, and the outer diameter of the core body is A, satisfying: 3%A≤C≤30%A.

5. The winding core according to claim 2, characterized in that, Along the radial direction of the core, from the center of the core body outward, the second end is sequentially provided with the third pole lug region and the first peripheral hollow lug region.

6. The winding core according to claim 5, characterized in that, The outer diameter of the third tab region is D, and the outer diameter of the core body is A, satisfying: 65%A≤D≤80%A.

7. The winding core according to any one of claims 1-6, characterized in that, The third electrode tab is connected to the first electrode plate. The plane perpendicular to the axis of the core body is the projection plane, and the axis of the core body is the projection direction. In the projection plane, the projection of the first electrode tab before bending and the projection of the third electrode tab before bending at least partially overlap. Alternatively, the third electrode tab is connected to the second electrode plate, with a plane perpendicular to the axis of the core body as the projection plane and the axis of the core body as the projection direction. In the projection plane, the projection of the second electrode tab before bending and the projection of the third electrode tab before bending at least partially overlap.

8. The winding core according to claim 1, characterized in that, The core also includes a fourth electrode tab, which is disposed at the second end of the core body. One of the third electrode tab and the fourth electrode tab is connected to the first electrode plate, and the other is connected to the second electrode plate.

9. The winding core according to claim 8, characterized in that, The third electrode lugs are bent and stacked in multiple layers to form a third electrode lug area, and the fourth electrode lugs are bent and stacked in multiple layers to form a fourth electrode lug area. Along the radial direction of the core body, from the center of the core body outward, the second end is sequentially provided with the fourth electrode lug area, the first middle ring hollow lug area and the third electrode lug area. The fourth electrode lug area and the third electrode lug area extend along the circumference of the core body to form a closed or open ring.

10. The winding core according to claim 8, characterized in that, The third electrode lugs are bent and stacked in multiple layers to form a third electrode lug area, and the fourth electrode lugs are bent and stacked in multiple layers to form a fourth electrode lug area. Along the radial direction of the core body, from the center of the core body outward, the second end is sequentially provided with a third central hollow lug area, the fourth electrode lug area and the third electrode lug area. The fourth electrode lug area and the third electrode lug area extend along the circumference of the core body to form a closed or open ring.

11. The winding core according to claim 10, characterized in that, The inner diameter of the fourth tab region is J, and the outer diameter of the core body is A, satisfying: 3%A≤J≤22%A.

12. The winding core according to claim 8, characterized in that, The third electrode lugs are bent and stacked in multiple layers to form a third electrode lug area, and the fourth electrode lugs are bent and stacked in multiple layers to form a fourth electrode lug area. Along the radial direction of the core body, from the center of the core body outward, the second end is sequentially provided with the fourth electrode lug area, the third electrode lug area and the third peripheral hollow lug area. The fourth electrode lug area and the third electrode lug area extend along the circumference of the core body to form a closed or open ring.

13. The winding core according to claim 12, characterized in that, The outer diameter of the third tab region is D, and the outer diameter of the core body is A, satisfying: 85%A≤D<100%A.

14. The winding core according to any one of claims 9-13, characterized in that, The outer diameter of the core body is A, and the outer diameter of the fourth tab region is I, satisfying: 25%A≤I≤35%A; and / or, the inner diameter of the third tab region is C, satisfying: 40%A≤C≤75%A.

15. The winding core according to any one of claims 8-13, characterized in that, The third electrode is connected to the first electrode.

16. The winding core according to claim 15, characterized in that, Using a plane perpendicular to the axis of the core body as the projection plane and the axial direction of the core body as the projection direction, the projection of the first tab before bending and the projection of the third tab before bending partially overlap in the projection plane.

17. The winding core according to any one of claims 8-13, characterized in that, The fourth electrode is connected to the second electrode plate.

18. The winding core according to claim 17, characterized in that, Using a plane perpendicular to the axis of the core body as the projection plane and the axial direction of the core body as the projection direction, the projection of the second pole lug before bending and the projection of the fourth pole lug before bending are at least partially overlapped in the projection plane.

19. The winding core according to claim 1, characterized in that, Multiple layers of the first electrode tab are bent and stacked to form a first electrode tab area, and multiple layers of the second electrode tab are bent and stacked to form a second electrode tab area. Along the radial direction of the core body, from the center of the core body outward, the first end is sequentially provided with a first electrode tab area, a second central loop hollow area and a second electrode tab area. The first electrode tab area and the second electrode tab area extend along the circumference of the core to form a closed or open ring.

20. The winding core according to claim 1, characterized in that, Multiple layers of the first electrode tab are bent and stacked to form a first electrode tab region, and multiple layers of the second electrode tab are bent and stacked to form a second electrode tab region. Along the radial direction of the core body, from the center of the core body outward, the first end is sequentially provided with a second central hollow tab region, a first electrode tab region, and a second electrode tab region.

21. The winding core according to claim 20, characterized in that, The inner diameter of the first tab area is M, and the outer diameter of the core body is A, satisfying: 3%A≤M≤22%A.

22. The winding core according to claim 1, characterized in that, Multiple layers of the first electrode tab are bent and stacked to form a first electrode tab area, and multiple layers of the second electrode tab are bent and stacked to form a second electrode tab area. Along the radial direction of the core body, from the center of the core body outward, the first end is sequentially provided with the first electrode tab area, the second electrode tab area and the second peripheral hollow tab area.

23. The winding core according to claim 22, characterized in that, The outer diameter of the second electrode ear region is E, and the outer diameter of the core body is A, satisfying: 85%A≤E<100%A.

24. The winding core according to any one of claims 19-23, characterized in that, The outer diameter of the core body is A, and the outer diameter of the first tab region is G, satisfying: 35%A≤G≤50%A; and / or, the inner diameter of the second tab region is F, satisfying: 60%A≤F≤75%A.

25. The winding core according to claim 24, characterized in that, FG≥4mm.

26. The winding core according to any one of claims 19-23, characterized in that, The outer diameter of the second tab region is E, and the inner diameter of the second tab region is F, satisfying: EF≥4mm.

27. The core according to any one of claims 1-6 or 8-13, characterized in that, The first electrode is the positive electrode, and the second electrode is the negative electrode.

28. A battery cell, characterized in that, include: The shell has a receiving cavity; And, the core as described in any one of claims 1-27, is disposed in the receiving cavity.

29. A battery pack, characterized in that, It includes a housing and the battery cells as described in claim 27, with a plurality of the battery cells mounted in the housing.

30. An electrical appliance, characterized in that, It includes the battery cell as described in claim 28 or the battery pack as described in claim 29, wherein the battery pack or the battery cell supplies power to the electrical device.

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