Roll core, battery cell and battery

Abstract

The utility model provides a roll core, a battery cell and a battery, and relates to the technical field of batteries. The roll core comprises a roll core main body and a first tab; the roll core main body comprises a first pole piece, a diaphragm and a second pole piece, and the diaphragm is positioned between the first pole piece and the second pole piece; the roll core body is provided with a first end. The first tab is arranged at the first end part and is connected to the first pole piece; the plurality of layers of first tabs are stacked at the first end part to form a plurality of first tab areas, the plurality of first tab areas are arranged along the circumferential direction of the roll core main body, and the maximum distance from one side, far away from the center of the roll core main body, of the plurality of first tab areas to the center of the roll core main body is smaller than the radius of the roll core main body; a gap is formed between two adjacent first tab regions in the circumferential direction of the roll core main body, and the gap is a first tab-free region. According to the present invention, the plurality of first tab-free regions are arranged on the first tab region, such that the electrolyte can directly flow into the roll core through the first tab-free regions so as to shorten the path of the electrolyte infiltrating the roll core, and further improve the infiltration efficiency of the roll core.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly relates to a core, an electrode core and a battery. Background Art

[0002] In the related art, a battery includes a housing and a core disposed within the housing. The core includes a positive electrode sheet, a negative electrode sheet and a separator that are sequentially stacked and wound. Among them, the electrode sheet includes a coated area and a bare foil area located at the periphery of the coated area. The coated area is used for coating active material, and the bare foil area serves as an electrode tab.

[0003] In order to control the height of the electrode tab inside the electrode core, it is necessary to flatten the electrode tab, that is, bend the electrode tab towards the end of the core so that two adjacent electrode tabs are stacked along the axial direction of the core. However, the flattened electrode tab will block the end of the core, resulting in the electrolyte mainly flowing down from the middle hole of the core to the bottom of the inner cavity of the electrode core, and then adsorbing the electrolyte through the electrode sheet to adsorb the electrolyte to the top of the core to complete the infiltration of the core. In this way, the path of the electrolyte infiltrating the core is long, resulting in poor infiltration efficiency of the core. Summary of the Utility Model

[0004] Embodiments of the present application provide a core, an electrode core and a battery, which can improve the infiltration efficiency of the core.

[0005] In a first aspect, an embodiment of the present application provides a core, which includes a core body and a first electrode tab; the core body includes a first electrode sheet, a separator and a second electrode sheet that are wound, the separator is located between the first electrode sheet and the second electrode sheet, the polarities of the first electrode sheet and the second electrode sheet are opposite, and along the axial direction of the core, the core body has a first end; the first electrode tab is disposed at the first end and connected to the first electrode sheet; wherein, multiple layers of first electrode tabs are stacked at the first end to form multiple first electrode tab areas, the multiple first electrode tab areas are arranged along the circumferential direction of the core body, and the maximum distance from the side of the multiple first electrode tab areas away from the center of the core body to the center of the core body is less than the radius of the core body; there is a gap between two adjacent first electrode tab areas in the circumferential direction of the core body, and the gap is a first non-electrode tab area.

[0006] In an embodiment, with the axial direction of the core as the projection direction, the first non-electrode tab area is projected as a sector, and the small end of the sector faces the axis of the core.

[0007] In an embodiment, the central angle of each first non-electrode tab area is α1, satisfying: 10° ≤ α1 ≤ 45°.

[0008] In an embodiment, with the axial direction of the core as the projection direction, the total projected area of the multiple first electrode tab areas is S1, and the area of the first end is S, satisfying: 0.5 ≤ S1 / S < 1.

[0009] In one embodiment, the maximum distance from the side of the first tab area away from the center of the core body to the center of the core body is B, and the radius of the core body is R, satisfying: 0.8R ≤ B < R.

[0010] In one embodiment, the minimum distance from the side of the first tab area close to the center of the core body to the center of the core body is C, and the radius of the core body is R, satisfying: 0.02R ≤ C ≤ 0.25R.

[0011] In one embodiment, the core further includes a second tab. The core has a second end opposite to the first end; the second tab is disposed at the second end and connected to the second tab plate; wherein, multiple layers of second tabs are stacked at the second end to form multiple second tab areas, and the multiple second tab areas are arranged along the circumferential direction of the core body. There is a gap between two adjacent second tab areas in the circumferential direction of the core body, and the gap is the second tabless area;

[0012] The number of the second tabless areas is the same as that of the first tabless areas, and the first tabless areas and the second tabless areas correspond to each other one by one. Along the axial direction of the core, the first tabless area and the corresponding second tabless area overlap at most partially.

[0013] In one embodiment, along the circumferential direction of the core body, the second tabless area has a deflection angle β relative to the corresponding first tabless area, satisfying: 5° ≤ β ≤ 45°.

[0014] In a second aspect, an embodiment of the present application provides an electric core, which includes a housing, a cover plate and the aforementioned core. The cover plate and the housing are covered to define an accommodation cavity; the core is disposed in the accommodation cavity.

[0015] In a third aspect, an embodiment of the present application provides a battery, which includes the aforementioned electric core.

[0016] Beneficial effects of the embodiments of the present application:

[0017] In the embodiments of the present application, by providing multiple first tabless areas on the first tab area, the electrolyte can directly flow into the interior of the core through the first tabless areas, thereby shortening the path of the electrolyte to infiltrate the core, and further improving the infiltration efficiency of the core. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can be obtained according to these drawings.

[0019] Figure 1 It is a schematic structural diagram of the core provided by the embodiment of the present application;

[0020] Figure 2 is a schematic structural diagram of the first end portion provided by an embodiment of the present application;

[0021] Figure 3 is a schematic structural diagram of the second end portion provided by an embodiment of the present application;

[0022] Figure 4 is a schematic diagram of the deflection of the first tabless region corresponding to the second tabless region provided by an embodiment of the present application;

[0023] Figure 5 is a schematic structural diagram of a battery cell provided by an embodiment of the present application;

[0024] Figure 6 is a schematic structural diagram of a battery provided by an embodiment of the present application.

[0025] Description of reference numerals:

[0026] 001 - winding core;

[0027] 011 - winding core body;

[0028] 111 - first end portion; 1111 - first tabless region;

[0029] 112 - second end portion; 1121 - second tabless region;

[0030] 113 - middle hole;

[0031] 012 - first tab region; 121 - first tab;

[0032] 013 - second tab region; 131 - second tab;

[0033] 002 - battery cell; 021 - housing; 022 - cover plate;

[0034] 003 - battery; 031 - box body. Detailed implementation manners

[0035] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application.

[0036] In addition, it should be understood that the specific embodiments described herein are for illustrative and explanatory purposes only and are not intended to limit the present application. In the present application, unless otherwise stated, the directional terms such as "upper" and "lower" generally refer to the upper and lower directions in the actual use or working state of the device, specifically the drawing directions in the drawings; while "inner" and "outer" refer to the outline of the device.

[0037] 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 quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of the present application, the meaning of "a plurality" is two or more unless otherwise specifically defined.

[0038] In the description of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "mounted", "connected" and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection or an integral connection; it may be a mechanical connection, an electrical connection or a connection capable of mutual communication; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0039] To facilitate the understanding of the solution of the present application, the spline curves and arrows used for the reference numerals in the drawings are described herein: For the components indicated by the spline curves without arrows, they are solid components, that is, components having a solid structure; for the components indicated by the spline curves with arrows, they are virtual components, that is, components without a solid structure.

[0040] Please refer to Figure 1 and Figure 2 , Figure 1 which is a schematic structural diagram of the core 001 provided by the embodiment of the present application, Figure 2It is a schematic structural diagram of the first end portion 111 provided by an embodiment of the present application. An embodiment of the present application provides a bobbin 001. The bobbin 001 includes a bobbin body 011 and a first tab 121. The bobbin body 011 includes a first electrode tab, a separator, and a second electrode tab that are wound. The separator is located between the first electrode tab and the second electrode tab. The polarities of the first electrode tab and the second electrode tab are opposite. Along the axial direction of the bobbin 001, the bobbin body 011 has a first end portion 111. The first tab 121 is disposed at the first end portion 111 and is connected to the first electrode tab. Among them, multiple first tabs 121 are stacked at the first end portion 111 to form a plurality of first tab regions 012. The plurality of first tab regions 012 are arranged along the circumferential direction of the bobbin body 011. The maximum distance from the side of the plurality of first tab regions 012 away from the center of the bobbin body 011 to the center of the bobbin body 011 is less than the radius of the bobbin body 011. There is a gap between two adjacent first tab regions 012 in the circumferential direction of the bobbin body 011, and this gap is the first tabless region 1111.

[0041] Specifically, the plurality of first tab regions 012 are arranged in a common circular ring along the circumferential direction of the bobbin body 011.

[0042] Before being bent, the tabs are parallel to the axial direction of the bobbin 001. After being bent, the tabs are stacked in sequence along the axial direction of the bobbin 001 to form a tab region.

[0043] The tabless region is the region where no tab is provided at the end of the bobbin 001.

[0044] Among them, the first electrode tab includes a coated region coated with active material and an uncoated region not coated with active material. The first tab 121 can be integrally provided as at least part of the uncoated region. In other embodiments, the first tab 121 can be separately welded to the first electrode tab.

[0045] In addition, the first tab 121 can be a positive tab or a negative tab.

[0046] Exemplarily, the number of the first tabless regions 1111 is n, satisfying: 2 ≤ n ≤ 6. The plurality of first tabless regions 1111 are evenly spaced along the circumferential direction of the bobbin 001. Optionally, there are three first tabless regions 1111. Correspondingly, the number of the first tab regions 012 is the same as the number of the first tabless regions 1111, which is also three.

[0047] In this embodiment, by providing a plurality of first non-tab regions 1111 on the first tab region 012, on the one hand, the electrolyte can directly flow into the interior of the core 001 through the first non-tab regions 1111, thereby shortening the path for the electrolyte to infiltrate the core 001, and further improving the infiltration efficiency of the core 001; on the other hand, the core 001 can have a plurality of liquid inlet sites on the first end portion 111, and the plurality of liquid inlet sites infiltrate the core 001 in the radial direction of the core 001, which can improve the uniformity of the infiltration of the core 001, and thus further improve the infiltration efficiency of the core 001.

[0048] Moreover, by arranging the plurality of first tab regions 012 at intervals in the circumferential direction of the core 001, when the first tabs 121 are flattened, the interference between the first tabs 121 of two adjacent first tab regions 012 in the circumferential direction of the core 001 can be reduced, thereby reducing the metal debris generated when the first tabs 121 are flattened, and further improving the reliability of the battery.

[0049] In addition, by making the maximum distance from the side of the first tab region 012 away from the center of the core body 011 to the center of the core body 011 less than the radius of the core body 011, the first tab region 012 can be arranged at intervals from the outer periphery of the core body 011. In this way, not only can the electrolyte infiltrate from the circumferential direction of the core 001, but also the size of the end portion of the core 001 can be controlled to facilitate the insertion of the core 001 into the shell.

[0050] Please refer to Figure 2 , in an embodiment, with the axial direction of the core 001 as the projection direction and the plane perpendicular to the axis of the core 001 as the projection plane, the projection of the first non-tab region 1111 in the projection plane is a sector, and the small end of the sector faces the axis of the core 001.

[0051] Wherein, the center of the sector coincides with the center of the core 001.

[0052] In this embodiment, through the above arrangement, the size of the first non-tab region 1111 in the circumferential direction of the core 001 can be positively correlated with the circumferential size of the first tab region 012. Thus, on the one hand, the area of the first non-tab region 1111 can be increased to facilitate improving the infiltration efficiency, and on the other hand, the influence of the first non-tab region 1111 on the circumferential size of the first tab region 012 can be reduced to facilitate the operability and reliability of welding the first tab region 012 to the current collector plate.

[0053] Please refer to Figure 2 , in an embodiment, the central angle of each first non-tab region 1111 is α1, satisfying: 10° ≤ α1 ≤ 45°.

[0054] It can be understood that α1 includes but is not limited to 10°, 12°, 14.5°, 16°, 17°, 18°, 19°, 20°, 22°, 26°, 29°, 30°, 36°, 38°, 39°, 40°, 42.5°, 44°, 45°.

[0055] Further, 20° ≤ α1 ≤ 35°.

[0056] In this embodiment, through the above limitations, on the one hand, it can be avoided that the size of the first tabless area 1111 in the circumferential direction of the core 001 is too small, which is not conducive to the flow of the electrolyte. On the other hand, it can be avoided that the size of the first tabless area 1111 in the circumferential direction of the core 001 is too large, resulting in too small an area of the first tab area 012. Thus, it can ensure that the total area of the first tab 121 meets the current collection requirements of the core 001, and can ensure the ease of operation and reliability of welding the first tab area 012 to the current collection plate.

[0057] In one embodiment, with the axial direction of the core 001 as the projection direction and the plane perpendicular to the axis of the core 001 as the projection plane, the total area of the multiple first tab areas 122 in the projection plane is S1, and the area of the first end 111 is S, satisfying: 0.5 ≤ S1 / S < 1.

[0058] Exemplarily, the ratio between the area S1 of the first tab area 012 in the projection plane and the area S of the first end 111 includes but is not limited to: 0.5, 0.52, 0.55, 0.58, 0.6, 0.62, 0.63, 0.64, 0.66, 0.66, 0.68, 0.7, 0.72, 0.76, 0.78, 0.8, 0.85, 0.9, 0.95.

[0059] Further, 0.5 ≤ S1 / S ≤ 0.8.

[0060] In this embodiment, through the above limitations, on the one hand, it can make the first tab area 012 have enough area to meet the current collection requirements of the core 001; on the other hand, it can avoid the area of the first tab area 012 being too large, resulting in too small an area of the tabless area, thus ensuring the liquid inlet speed of the first end 111 and being conducive to improving the wetting efficiency of the core 001.

[0061] In one embodiment, the maximum distance from the side of the first tab area 012 far from the center of the core body 011 to the center of the core body 011 is B, and the radius of the core body 011 is R, satisfying: 0.8R ≤ B < R.

[0062] It can be understood that B includes but is not limited to: 0.8R, 0.81R, 0.81.5R, 0.82R, 0.83R, 0.84R, 0.85R, 0.86R, 0.88R, 0.9R, 0.92R, 0.95R, 0.99R.

[0063] Exemplarily:

[0064] When R is 44.6 mm, 35.68 mm ≤ B < 44.6 mm;

[0065] When R is 45 mm, 36 mm ≤ B < 45 mm;

[0066] When R is 45.2 mm, 36.16 mm ≤ B < 45.2 mm.

[0067] Furthermore, 0.8R ≤ B ≤ 0.95R.

[0068] In this embodiment, through the above limitations, the distance between the first tab area 012 and the outer periphery of the core body 011 can be prevented from being too large, resulting in a small area of the first tab 121. Thus, the area of the first tab 121 can be ensured to meet the requirements of the current collection ability of the first tab.

[0069] Please refer to Figure 2 , in an embodiment, the minimum distance from the side of the first tab area 012 close to the center of the core body 011 to the center of the core body 011 is C, and the radius of the core body 011 is R, satisfying: 0.02R ≤ C ≤ 0.25R.

[0070] It can be understood that C includes but is not limited to: 0.02R, 0.06R, 0.08R, 0.1R, 0.11R, 0.12R, 0.15R, 0.18R, 0.2R, 0.4R, 0.25R.

[0071] Exemplarily:

[0072] When R is 44.6 mm, 0.892 mm ≤ C ≤ 11.5 mm;

[0073] When R is 45 mm, 0.9 mm ≤ C ≤ 11.25 mm;

[0074] When R is 45.2 mm, 0.904 mm ≤ C ≤ 11.3 mm.

[0075] Furthermore, 0.1R ≤ C ≤ 0.25R.

[0076] In this embodiment, through the above limitations, on the one hand, the distance between the side of the first tab area 012 close to the center of the core body 011 and the center of the core body 011 can be avoided from being too small, so as to avoid the first tab 121 blocking the middle hole 113 of the core 001, which is beneficial to the electrolyte flowing to the bottom of the core 001 through the middle hole 113; on the other hand, the distance between the side of the first tab area 012 close to the center of the core body 011 and the center of the core body 011 can be avoided from being too large, resulting in a small area of the first tab 121, so as to ensure the area of the first tab 121, so that the current collection ability of the first electrode sheet meets the requirements.

[0077] It can be understood that when the first tabless area 1111 extends circumferentially along the core body 011 to form a ring, the outer diameter and inner diameter of the first tabless area 1111 are 2B and 2C respectively.

[0078] Please refer to Figure 3 , Figure 3 FIG. is a schematic structural diagram of the second end portion 112 provided by an embodiment of the present application. In one embodiment, the core 001 further includes a second tab 131. The core 001 has a second end portion 112 disposed opposite to the first end portion 111. The second tab 131 is disposed on the second end portion 112 and is connected to the second electrode sheet. Among them, multiple second tabs 131 are stacked on the second end portion 112 to form a plurality of second tab areas 013. The plurality of second tab areas 013 are arranged circumferentially along the core body 011. A plurality of second tabless areas 1121 are provided on the second tab area 013. There is an interval between two adjacent second tab areas 013 in the circumferential direction of the core body 011, and the interval is the second tabless area 1121.

[0079] Specifically, the second electrode sheet includes a coating area coated with active material and an uncoated area not coated with active material. The second tab 131 can be integrally provided as at least part of the uncoated area. In other embodiments, the second tab 131 can be separately welded to the second electrode sheet.

[0080] In addition, among the first tab 121 and the second tab 131, one is a positive tab and the other is a negative tab. Usually, the tab close to the top cover of the battery cell is set as the positive tab.

[0081] Optionally, the plurality of second tab areas 013 are arranged in a common circular ring along the circumferential direction of the core body 011.

[0082] In this embodiment, by providing a plurality of second non-tab regions 1121 on the second tab region 013, on the one hand, the electrolyte can directly flow into the interior of the core 001 through the second non-tab regions 1121, thereby increasing the path for the electrolyte to infiltrate the core 001, and further improving the infiltration efficiency of the core 001; on the other hand, the core 001 can have a plurality of liquid inlet sites on the second end portion 112, and the plurality of liquid inlet sites infiltrate the core 001 along the radial direction of the core 001, which can improve the uniformity of the infiltration of the core 001, and further improve the infiltration efficiency of the core 001.

[0083] Moreover, by spacing the second tab regions 013 along the circumferential direction of the core 001, when flattening the second tabs 131, the interference between the second tabs 131 of two adjacent second tab regions 013 in the circumferential direction of the core 001 can be reduced, thereby reducing the metal debris generated when the second tabs 131 are flattened, and further improving the reliability of the battery.

[0084] Please refer to Figure 4 , Figure 4 which is a schematic diagram of the deflection of the first non-tab region 1111 provided in the embodiment of the present application relative to the corresponding second non-tab region 1121. Figure 4 In, the region shown by the solid line and filled with lines is the second tab region 132, and the region shown by the dotted line is the first tab region 122. In one embodiment, the number of the second non-tab regions 1121 is the same as the number of the first non-tab regions 1111. The first non-tab regions 1111 and the second non-tab regions 1121 correspond to each other one by one. Along the axial direction of the core 001, the first non-tab region 1111 and the corresponding second non-tab region 1121 overlap at most partially.

[0085] Specifically, along the circumferential direction of the core body 011, the second non-tab region has a deflection angle β relative to the corresponding first non-tab region 1111, satisfying: 5° ≤ β ≤ 45°.

[0086] It can be understood that β includes but is not limited to 5°, 8°, 10°, 12.5°, 15°, 18°, 19°, 20°, 21.2°, 24°, 25°, 27°, 29°, 35°, 38°, 40°, 42°, 45°.

[0087] Among them, the deflection angle can be the deflection angle of the second non-tab region 1121 relative to the first non-tab region 1111 in the clockwise direction; or it can be the deflection angle of the second non-tab region 1121 relative to the first non-tab region 1111 in the counterclockwise direction, as Figure 4 shown.

[0088] In this embodiment, through the above settings, the second non-tab region 1121 is deflected relative to the first non-tab region 1111. On the one hand, the first end 111 and the second end 112 can respectively feed liquid from different radial positions of the core 001, thereby further improving the uniformity of the infiltration of the core 001, and further improving the infiltration efficiency of the core 001. On the other hand, the first non-tab region 1111 is at least partially disposed opposite to the second tab region 013. Thus, when the electrode liquid entering the core 001 from the first non-tab region 1111 is discharged from the second end 112, the discharge of this part of the electrolyte is slowed down due to the obstruction of the second tab region 013. In this way, more electrolyte can be retained in the core 001, thereby improving the electrolyte infiltration efficiency.

[0089] In one embodiment, the structure of the second tab region 013 is the same as that of the first tab region 012, and the structure and quantity of the second non-tab region 1121 are the same as those of the first non-tab region 1111. Specifically as follows:

[0090] Taking the axial direction of the core 001 as the projection direction and the plane where the second end 112 is located as the projection plane, the projection of the second non-tab region 1121 in the projection plane is a sector, and the small end of the sector faces the axis of the core 001.

[0091] Further, the central angle of each second non-tab region 1121 is α2, satisfying: 10° ≤ α2 ≤ 45°.

[0092] Further, taking the axial direction of the core 001 as the projection direction and the plane where the second end 112 is located as the projection plane, the total area of the multiple second tab regions 132 in the projection plane is S2, and the area of the second end 112 is S, satisfying: 0.5 ≤ S2 / S < 1, and further, 0.5 ≤ S2 / S ≤ 0.8.

[0093] Further, the maximum distance from the side of the second tab region 013 away from the center of the core body 011 to the center of the core body 011 is D, and the radius of the core body 011 is R, satisfying: 0.8R ≤ B < R.

[0094] Further, the minimum distance from the side of the second tab region 013 close to the center of the core to the center of the core is F, and the radius of the core body 011 is R, satisfying: 0.02R ≤ C ≤ 0.25R.

[0095] It can be understood that when the second tab region 013 extends circumferentially along the core body 011 as a ring, the outer diameter and inner diameter of the second tab region 013 are 2D and 2F respectively.

[0096] Please refer to Figure 5 , Figure 5It is a schematic structural diagram of the battery cell 002 provided by the embodiment of the present application. Correspondingly, the embodiment of the present application provides a battery cell 002, which includes a housing 021, a cover plate 022, and the aforementioned wound core 001; the cover plate 022 is covered with the housing 021 to define a receiving cavity; the wound core 001 is disposed in the receiving cavity.

[0097] In this embodiment, by adopting the aforementioned wound core 001, on the one hand, the electrolyte can directly flow into the inside of the wound core 001 through the top of the wound core 001, so that the path of the electrolyte infiltrating the wound core 001 can be shortened, and thus the infiltration efficiency of the battery cell 002 can be improved; on the other hand, the wound core 001 can have a plurality of liquid inlet parts at the first end portion 111, and the plurality of liquid inlets are respectively infiltrated along the radial direction of the wound core 001, which can improve the uniformity of the infiltration of the wound core 001, and thus can further improve the infiltration efficiency of the battery cell 002.

[0098] Please refer to Figure 6 , Figure 6 It is a schematic structural diagram of the battery 003 provided by the embodiment of the present application. The embodiment of the present application provides a battery 003, which includes the aforementioned battery cell 002.

[0099] It can be understood that the battery 003 may further include a box body or a bottom plate, the battery cell 002 is disposed in the box body, or the battery cell 002 is mounted on the bottom plate.

[0100] In this embodiment, by adopting the aforementioned battery cell 002, on the one hand, the electrolyte can directly flow into the inside of the wound core 001 through the top of the wound core 001, so that the path of the electrolyte infiltrating the wound core 001 can be shortened, and thus the manufacturing efficiency of the battery 003 can be improved; on the other hand, the wound core 001 can have a plurality of liquid inlet parts at the first end portion 111, and the plurality of liquid inlets are respectively infiltrated along the radial direction of the wound core 001, which can improve the uniformity of the infiltration of the wound core 001, and thus can further improve the manufacturing efficiency of the battery 003.

[0101] The above has introduced the embodiments of the present application in detail. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application; at the same time, for those skilled in the art, according to the idea of the present application, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. A core, characterized in that, Comprising: A core body, including a first pole piece, a separator, and a second pole piece wound around, the separator being located between the first pole piece and the second pole piece, the polarities of the first pole piece and the second pole piece being opposite, along the axial direction of the core, the core body having a first end; A first tab, disposed at the first end and connected to the first pole piece; Wherein, multiple layers of the first tabs are stacked at the first end to form a plurality of first tab regions, the plurality of first tab regions are arranged along the circumferential direction of the core body, and the maximum distance from the side of the plurality of first tab regions away from the center of the core body to the center of the core body is less than the radius of the core body; There is a gap between two adjacent first tab regions in the circumferential direction of the core body, and the gap is a first tabless region.

2. The core according to claim 1, characterized in that, Taking the axial direction of the core as the projection direction, the projection of the first tabless region is a sector, and the small end of the sector faces the axis of the core.

3. The core according to claim 2, characterized in that, The central angle of each first tabless region is α1, satisfying: 10° ≤ α1 ≤ 45°.

4. The core according to claim 1, characterized in that, Taking the axial direction of the core as the projection direction, the total area of the projections of the plurality of first tab regions is S1, and the area of the first end is S, satisfying: 0.5 ≤ S1 / S < 1.

5. The core according to any one of claims 1-4, characterized in that, The maximum distance from the side of the first tab region away from the center of the core body to the center of the core body is B, and the radius of the core body is R, satisfying: 0.8R ≤ B < R.

6. The core according to any one of claims 1-4, characterized in that The minimum distance from the side of the first tab region close to the center of the core body to the center of the core body is C, and the radius of the core body is R, satisfying: 0.02R ≤ C ≤ 0.25R.

7. The core according to any one of claims 1-4, characterized in that The core further includes a second tab, the core having a second end disposed opposite to the first end; the second tab is disposed at the second end and connected to the second pole piece; Wherein, multiple layers of the second tabs are stacked at the second end to form a plurality of second tab regions, the plurality of second tab regions are arranged along the circumferential direction of the core body, and there is a gap between two adjacent second tab regions in the circumferential direction of the core body, and the gap is a second tabless region; The number of the second tabless regions is the same as that of the first tabless regions, the first tabless regions and the second tabless regions correspond to each other one by one, and along the axial direction of the core, each first tabless region and the corresponding second tabless region overlap at most partially.

8. The core according to claim 7, characterized in that, Along the circumferential direction of the core body, the second tabless region has a deflection angle β with respect to the corresponding first tabless region, satisfying: 5° ≤ β ≤ 45°.

9. A battery cell, characterized in that, Comprising: A housing; A cover plate, which is covered with the housing to define an accommodation cavity; And, the core according to any one of claims 1-8, disposed in the accommodation cavity.

10. A battery, characterized in that, Comprising the battery cell according to claim 9.

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