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 body is provided with a first end. The plurality of layers of first tabs are bent and stacked at the first end part to form a plurality of first tab regions, and a plurality of first radial tab-free regions and a plurality of first circumferential tab-free regions are defined; the first tab region comprises a plurality of first sub-tab regions which are arranged at intervals along the radial direction of the roll core; in the application, by arranging the first radial tab-free area and the first circumferential tab-free area, on one hand, an electrolyte can directly flow into the roll core through the tab-free areas, so that the path of the electrolyte infiltrating the roll core can be shortened, and the infiltration efficiency of the roll core can be improved; and on the other hand, the electrolyte can infiltrate the pole piece along the radial direction and the circumferential direction of the roll core, so that the infiltrating uniformity of the roll core can be improved, and the infiltrating efficiency can be improved.

Description

Technical Field

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

[0002] In the related art, a battery includes a housing and a wound core disposed inside the housing. The wound core includes a wound positive electrode sheet, a negative electrode sheet and a separator. Among them, the electrode sheet includes a coating area and a bare foil area located at the periphery of the coating area. The coating 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 toward the end face of the wound core so that two adjacent electrode tabs are stacked along the axial direction of the wound core. However, the flattened electrode tab will block the end of the wound core, resulting in the electrolyte mainly flowing down through the middle hole of the wound 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 wound core to complete the infiltration of the wound core. In this way, the path of the electrolyte infiltrating the wound core is long, resulting in poor infiltration efficiency of the wound core. Summary of the Utility Model

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

[0005] In a first aspect, an embodiment of the present application provides a wound core, which includes a wound core body and a first electrode tab; the wound core body includes a wound first electrode sheet, a separator and a second electrode sheet, 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 wound core, the wound 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 the first electrode tabs are bent and stacked at the first end to form multiple first electrode tab areas, and multiple first radially electrode-tabless areas and multiple first circumferentially electrode-tabless areas are defined; the multiple first electrode tab areas are arranged at intervals along the circumferential direction of the wound core body, and the first radially electrode-tabless area is located between two circumferentially adjacent first electrode tab areas; the first electrode tab area includes multiple first sub-electrode tab areas arranged at intervals along the radial direction of the wound core, and the first circumferentially electrode-tabless area is located between two radially adjacent first sub-electrode tab areas.

[0006] In one embodiment, the central angle of the first radially electrode-tabless area is α1, satisfying: 10° ≤ α1 ≤ 45°.

[0007] In one embodiment, the number of the first radially electrode-tabless areas is n, satisfying: 2 ≤ n ≤ 6.

[0008] In one embodiment, the circumferential line at half of the radius of the wound core body is disposed opposite to the first circumferentially electrode-tabless area.

[0009] In one embodiment, the width of the first circumferential tabless region is W1, and the unit thickness of the core body is d0, satisfying: 2d0 ≤ W1 ≤ 8d0, where d0 is the sum of the thickness of a first electrode tab, the thickness of a separator, the thickness of a second electrode tab, and the thickness of yet another separator.

[0010] In one embodiment, with the axial direction of the core as the projection direction, the total projected area of the first sub-tab region is S1, and the area of the first end portion is S, satisfying: 0.5 ≤ S1 / S < 1.

[0011] In one embodiment, the outer diameter of the core body is A, the aperture diameter of the middle hole of the core body is φ, a plurality of first tab regions are arranged in a common circular ring along the circumferential direction of the core body, the outer diameter of the circular ring where the first tab region is located is B, satisfying: B < A; and / or, the inner diameter of the circular ring where the first tab region is located is C, satisfying: C ≥ φ.

[0012] In one embodiment, the core further includes a second tab, and the core body has a second end portion opposite to the first end portion; the second tab is disposed at the second end portion and connected to the second electrode tab; wherein, multiple second tabs are bent and stacked at the second end portion to form a plurality of second tab regions, and define a plurality of second radially tabless regions and a plurality of second circumferentially tabless regions; the plurality of second tab regions are arranged at intervals along the circumferential direction of the core body, and the second radially tabless region is located between two circumferentially adjacent second tab regions; the second tab region includes a plurality of second sub-tab regions arranged at intervals along the radial direction of the core, and the second circumferentially tabless region is located between two radially adjacent second sub-tab regions.

[0013] In one embodiment, the number of the second tab regions is the same as the number of the first tab regions, the first tab regions and the second tab regions correspond to each other one by one, and along the axial direction of the core, the first tab region and the corresponding second tab region partially overlap.

[0014] In one embodiment, along the circumferential direction of the core body, the second tab region has a deflection angle β with respect to the corresponding first tab region, satisfying: 5° ≤ β ≤ 45°.

[0015] In one embodiment, the outer diameter of the core body is A, the aperture diameter of the middle hole of the core body is φ, the outer diameter of the circular ring where the second tab region is located is B', satisfying: B' < A; and / or, the inner diameter of the circular ring where the second tab region is located is C', satisfying: C' ≥ φ.

[0016] 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 a receiving cavity; the core is disposed in the receiving cavity.

[0017] In a third aspect, an embodiment of the present application provides a battery, which includes the aforementioned electric core.

[0018] Advantages of the embodiments of the present application:

[0019] In the embodiments of the present application, by providing the first radial tabless area and the first circumferential tabless area, on the one hand, the electrolyte can directly flow into the interior of the core through the tabless area, thereby shortening the path of the electrolyte to infiltrate the core, and further improving the infiltration efficiency of the core; on the other hand, the electrolyte can infiltrate the electrode sheet along the radial and circumferential directions of the core respectively, thereby improving the uniformity of the core infiltration, and further enhancing the infiltration efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] 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 drawings in the following description are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Figure 1 is a schematic structural diagram of a core provided by an embodiment of the present application;

[0022] Figure 2 is a schematic structural diagram of a first end provided by an embodiment of the present application;

[0023] Figure 3 is a schematic structural diagram of a second end provided by an embodiment of the present application;

[0024] Figure 4 is a schematic diagram of the deflection of the first tab area relative to the corresponding second tab area provided by an embodiment of the present application;

[0025] Figure 5 is a schematic structural diagram of a battery cell provided by an embodiment of the present application;

[0026] Figure 6 is a schematic structural diagram of a battery provided by an embodiment of the present application.

[0027] DESCRIPTION OF THE REFERENCE NUMERALS:

[0028] 001 - Core;

[0029] 011 - Core body; 111 - First end; 112 - Second end; 113 - Intermediate hole;

[0030] 012 - First tab area; 121 - First tab; 122 - First radial tabless area; 123 - First circumferential tabless area; 124 - First sub-tab area;

[0031] 013 - Second tab area; 131 - Second tab; 132 - Second radial tabless area; 133 - Second circumferential tabless area; 134 - Second sub-tab area;

[0032] 002 - Battery cell; 021 - Housing; 022 - Cover plate;

[0033] 003 - Battery; 031 - Box body. Detailed implementation manners

[0034] 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.

[0035] In addition, it should be understood that the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the 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, "a plurality of" means two or more, unless otherwise specifically defined.

[0036] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 that can communicate with each other; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside 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.

[0037] To facilitate the understanding of the solution of the present application, the spline curves and arrows used for the reference numerals in the accompanying drawings are described herein: For the components indicated by the spline curves without arrows, they are solid components, that is, components with a solid structure; for the components indicated by the spline curves with arrows, they are virtual components, that is, components without a solid structure.

[0038] Please refer to Figure 1 and Figure 2 , Figure 1 is a schematic structural diagram of the winding 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 core 001, which includes a core body 011 and a first tab 121. The core body 011 includes a wound first electrode sheet, a separator, and a second electrode sheet. 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. Along the axial direction of the core 001, the core body 011 has a first end portion 111. The first tab 121 is disposed at the first end portion 111 and connected to the first electrode sheet. Among them, multiple first tabs 121 are bent and stacked at the first end portion 111 to form multiple first tab regions 012, and define multiple first radially tabless regions 122 and multiple first circumferentially tabless regions 123. The multiple first tab regions 012 are arranged at intervals along the circumferential direction of the core body 011. The first radially tabless region 122 is located between two circumferentially adjacent first tab regions 012. The first tab region 012 includes multiple first sub-tab regions 124 arranged at intervals along the radial direction of the core 001. The first circumferentially tabless region 123 is located between two radially adjacent first sub-tab regions 124.

[0039] Specifically, the interval between two circumferentially adjacent first tab regions 012 on the circumferential direction of the core body 011 is the first radially tabless region 122. The interval between two radially adjacent first sub-tab regions 124 of the core 001 is the first circumferentially tabless region 123.

[0040] It can be understood that before the tab is bent, it is parallel to the axial direction of the core 001. After the tab is bent, the tabs are stacked in sequence along the axial direction of the core 001 to form a tab region. The tabless region is the region where the end face of the core 001 is not provided with tabs. Specifically, after the tabs are bent, the part of the end face of the core 001 not blocked by the tabs.

[0041] Among them, the first electrode sheet includes a coated area coated with active material and an uncoated area not coated with active material. The first tab 121 can be integrally provided as at least part of the uncoated area. In other embodiments, the first tab 121 can be separately welded to the first electrode sheet.

[0042] In addition, the first tab 121 can be a positive tab or a negative tab.

[0043] In this embodiment, by providing the first radially tabless region 122 and the first circumferentially tabless region 123, on the one hand, the electrolyte can directly flow into the interior of the core 001 through the tabless region, thereby shortening the path of the electrolyte to infiltrate the core 001, and then improving the infiltration efficiency of the core 001; on the other hand, the electrolyte can infiltrate the electrode sheet along the radial and circumferential directions of the core 001 respectively, thereby improving the uniformity of the infiltration of the core 001, and then enhancing the infiltration efficiency.

[0044] Moreover, the first radially tabless region 122 and the first circumferentially tabless region 123 can also provide space for thermal expansion of the first tabs 121 located on both sides thereof, thereby reducing the stress borne by the first tabs 121 after thermal expansion, and further improving the reliability of the battery cell.

[0045] Please refer to Figure 2 , in an embodiment, the central angle of the first radially tabless region 122 is α1, satisfying: 10° ≤ α1 ≤ 45°.

[0046] 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°.

[0047] Furthermore, 20° ≤ α1 ≤ 35°.

[0048] In this embodiment, through the above limitations, on the one hand, it can be avoided that the size of the first radially tabless region 122 in the circumferential direction of the core 001 is too small to be conducive to the flow of the electrolyte. On the other hand, it can be avoided that the size of the first radially tabless region 122 in the circumferential direction of the core 001 is too large, resulting in too small an area of the first tab region 012. Thus, it can be ensured that the total area of the first tabs 121 meets the current collection requirements of the core 001, and the ease of operation and reliability of welding the first tabs 121 to the current collection plate can be ensured.

[0049] In an embodiment, the number of the first radially tabless regions 122 is n, satisfying: 2 ≤ n ≤ 6.

[0050] Exemplarily, the number of the first radially tabless regions 122 can be 2, 3, 4, 5, or 6. The n first radially tabless regions 122 are evenly distributed along the circumferential direction of the core 001.

[0051] Specifically, as Figure 2 shown, the number of the first radially tabless regions 122 is three.

[0052] In this embodiment, through the above limitations, on the one hand, it can be avoided that too many first radially tabless regions 122 lead to complex tab processing, thereby controlling the manufacturing difficulty of the core 001, and further improving the manufacturing efficiency of the core 001. On the other hand, it can be avoided that too few first radially tabless regions 122 result in an insignificant improvement in the infiltration efficiency of the core 001.

[0053] Please refer to Figure 2 , in an embodiment, the circumferential line at half of the radius of the core body 011 is disposed opposite to the first circumferentially tabless region 123.

[0054] Exemplarily, the first tab region 012 includes four first sub-tab regions 124. Correspondingly, the four first sub-tab regions 124 form three first circumferential tabless regions 123 in the radial direction of the core 001. The three first circumferential tabless regions 123 are respectively disposed at 1 / 4, 1 / 2, and 3 / 4 of the radius of the core.

[0055] It can be understood that the tightness of the electrode sheet at 1 / 2 of the radius of the core 001 is closer than that of the outer circumference and the inner circumference of the core 001.

[0056] Based on this, in this embodiment, through the above settings, the electrolyte can directly infiltrate the parts with a relatively large tightness on the core 001, thereby further improving the infiltration uniformity of the core 001 and enhancing the infiltration efficiency of the core 001.

[0057] Please refer to Figure 2 In one embodiment, the width of the first circumferential tabless region 123 is W1, and the unit thickness of the core body 011 is d0, satisfying: 2d0 ≤ W1 ≤ 8d0.

[0058] Among them, the unit thickness d0 of the core body 011 is the sum of the thickness of a first electrode sheet, the thickness of a separator, the thickness of the second electrode sheet, and the thickness of another separator.

[0059] It can be understood that W1 includes but is not limited to: 2d0, 2.8d0, 3d0, 3.5d0, 4d0, 4.6d0, 5d0, 5.2d0, 6d0, 7.4d0, 7.6d0, 7.8d0, 8d0.

[0060] In this embodiment, through the above settings, on the one hand, W1 can have a suitable size to facilitate the flow of the electrolyte in the first circumferential tabless region 123 and cover more electrode sheets in the radial direction of the core 001; on the other hand, it can prevent W1 from being too large, resulting in a smaller area of the first tab region 012, so that the total area of the first tabs 121 can meet the current collection requirements of the core 001 and the core 001 can have a suitable internal resistance.

[0061] In one embodiment, with the axial direction of the core 001 as the projection direction, the total projected area of the first sub-tab regions 124 is S1, and the area of the first end portion 111 is S, satisfying: 0.5 ≤ S1 / S < 1.

[0062] It can be understood that with a plane perpendicular to the axial direction of the core 001 as the projection plane, the total projected area of the first sub-tab regions 124 in the projection plane is S1.

[0063] Exemplarily, the ratio of the total area S1 of the first sub-tab area 124 in the projection plane to 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.

[0064] Furthermore, 0.5 ≤ S1 / S ≤ 0.8.

[0065] In this embodiment, through the above limitations, on the one hand, the first sub-tab area 124 can have a sufficient total area to meet the current collection requirements of the core 001; on the other hand, it can be avoided that the total area of the first sub-tab area 124 is too large, resulting in too small an area of the tabless area, thereby ensuring the infiltration speed of the core 001 and facilitating the improvement of the infiltration efficiency of the core 001.

[0066] Please refer to Figure 2 , in an embodiment, the outer diameter of the core body 011 is A, the aperture diameter of the middle hole 113 of the core body 011 is φ, and a plurality of first tab areas 012 are arranged in a common ring along the circumferential direction of the core body 011. The outer diameter of the ring where the first tab area 012 is located is B, satisfying: B < A; and / or, the inner diameter of the ring where the first tab area 012 is located is C, satisfying: C ≥ φ.

[0067] Specifically, the outer diameter of the ring where the first tab area 012 is located is B, satisfying: B < A, or the inner diameter of the ring where the first tab area 012 is located is C, satisfying: C ≥ φ, or the outer diameter of the ring where the first tab area 012 is located is B, satisfying: B < A, and the inner diameter of the ring where the first tab area 012 is located is C, satisfying: C ≥ φ.

[0068] In this embodiment, by limiting the outer diameter B of the ring where the first tab area 012 is located to be smaller than the outer diameter A of the core body 011, the outside of the first tab area 012 can be spaced apart from the outer periphery of the core body 011, so that not only can the electrolyte infiltrate from the circumferential direction of the core 001, but also the size of the end of the core 001 can be controlled to facilitate the insertion of the core 001 into the shell. Moreover, it can also provide an expansion space for the radial outward expansion of the first tab 121 to reduce the stress on the first tab 121 after thermal expansion, thereby improving the reliability of the battery cell.

[0069] By limiting the inner diameter C of the ring where the first tab area 012 is located to be greater than the aperture φ of the middle hole 113 of the core body 011, on the one hand, it can prevent the first tab 121 from blocking the middle hole 113 of the core 001, thereby improving the smoothness of the electrolyte flowing in or out of the middle, and further improving the wetting efficiency of the core 001; on the other hand, it can provide a space for thermal expansion on the inner circumferential side of the first tab area 012, thereby reducing the stress on the first tab 121 after thermal expansion, and further improving the reliability of the battery cell.

[0070] 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 body 011 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 connected to the second electrode tab. Among them, multiple second tabs 131 are bent and stacked on the second end portion 112 to form multiple second tab areas 013, and multiple second radially tabless areas 132 and multiple second circumferentially tabless areas 133 are defined. The multiple second tab areas 013 are arranged at intervals along the circumferential direction of the core body 011, and the second radially tabless area 132 is located between two circumferentially adjacent second tab areas 013. The second tab area 013 includes multiple second sub-tab areas 134 arranged at intervals along the radial direction of the core 001. The second circumferentially tabless area 133 is located between two radially adjacent second sub-tab areas 134.

[0071] It can be understood that the interval between two circumferentially adjacent second tab areas 013 on the circumference of the core body 011 is the second radially tabless area 132. The interval between two radially adjacent second sub-tab areas 134 on the core 001 is the second circumferentially tabless area 133.

[0072] Specifically, the second electrode tab 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 a part of the uncoated area. In other embodiments, the second tab 131 can be separately welded to the second electrode tab.

[0073] 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.

[0074] In this embodiment, by providing a second radially tabless area 132 and a second circumferentially tabless area 133 on the second tab area 013, on the one hand, the electrolyte can directly flow into the interior of the core 001 through the tabless areas, thereby increasing the area of direct contact between the electrode sheets and the electrolyte, and further improving the wetting efficiency of the core 001; on the other hand, the electrolyte can wet the electrode sheets along the radial and circumferential directions of the core 001 respectively, thereby improving the uniformity of wetting of the core 001, and further enhancing the wetting efficiency.

[0075] Moreover, the second radially tabless area 132 and the second circumferentially tabless area 133 can also provide space for thermal expansion for the second tabs 131 located on both sides thereof, thereby reducing the stress borne by the second tabs 131 after thermal expansion, and further enhancing the reliability of the battery cell.

[0076] Please refer to Figure 3 , in one embodiment, the number of the second tab areas 013 is the same as that of the first tab areas 012, and the first tab areas 012 and the second tab areas 013 correspond to each other one by one. Along the axial direction of the core 001, the first tab area 012 and the corresponding second tab area 013 partially overlap, as Figure 4 shown in Figure 4 is a schematic diagram of the deflection of the first tab area 012 provided by the embodiment of the present application relative to the corresponding second tab area 013. Figure 4 In , the area shown by the solid line and filled with lines is the second tab area 013, and the thick dashed line shows the first tab area 012.

[0077] Specifically, along the circumferential direction of the core body 011, the second tab area 013 has a deflection angle β relative to the corresponding first tab area 012, satisfying: 5° ≤ β ≤ 45°.

[0078] 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°.

[0079] Among them, the deflection angle can be that the second tab area 013 has a deflection angle relative to the corresponding first tab area 012 in the clockwise direction; or it can be that the second tab area 013 has a deflection angle relative to the corresponding first tab area 012 in the counterclockwise direction.

[0080] In this embodiment, through the above settings, the second tab region 013 has a deflection angle relative to the corresponding first tab region 012. On the one hand, the first end portion 111 and the second end portion 112 can respectively introduce liquid from different radial positions of the core 001, thereby further improving the uniformity of the infiltration of the core 001 and then enhancing the infiltration efficiency of the core 001. On the other hand, it can also make the first radially tabless region 122 at least partially disposed opposite to the second tab region 013. Thus, when the electrode liquid entering the core 001 from the first radially tabless region 122 is discharged from the second end portion 112, the discharge of this part of the electrolyte is slowed down due to the obstruction of the second tab region 013, so that more electrolyte can be retained in the core 001, thereby enhancing the electrolyte infiltration efficiency.

[0081] Among them, the remaining structure of the second end portion 112 is the same as that of the first end portion 111. Specifically, as Figure 3 shown, the outer diameter of the core body 011 is A, the aperture diameter of the middle hole 113 of the core body 011 is φ, and a plurality of second tab regions 013 are arranged in a common circular ring along the circumferential direction of the core body 011. The outer diameter of the circular ring where the second tab region 013 is located is B', satisfying: B' < A; and / or, the inner diameter of the circular ring where the second tab region 013 is located is C', satisfying: C' ≥ φ.

[0082] The central angle of the second radially tabless region 132 is α2, satisfying: 10° ≤ α2 ≤ 45°.

[0083] The width of the second circumferentially tabless region 133 is W2, and the unit thickness of the core body 011 is d0, satisfying: 2d0 ≤ W2 ≤ 8d0.

[0084] Taking the axial direction of the core 001 as the projection direction, the total projected area of the second sub-tab region 134 is S2, and the area of the second end portion 112 is S, satisfying: 0.5 ≤ S2 / S < 1. Further, 0.5 ≤ S2 / S ≤ 0.8. Among them, taking the plane perpendicular to the axial direction of the core 001 as the projection plane, the total projected area of the second sub-tab region 134 in the projection plane is S2.

[0085] In addition, both the first sub-tab region 124 and the second sub-tab region 134 are fan-shaped ring structures, and the central angles of the plurality of first sub-tab regions 124 in the first tab region 012 are equal, and the central angles of the plurality of second sub-tab regions 134 in the second tab region 013 are equal. Among them, the fan-shaped ring means that the first sub-tab region 124 and the second sub-tab region 134 extend along the circumferential direction of the core body 011, and the extended central angle is less than 360° to form a shape. For example, the central angle of the first sub-tab region 124 and the second sub-tab region 134 extending along the circumferential direction of the core body 011 is 30°.

[0086] Please refer to Figure 5 ,Figure 5 It is a schematic structural diagram of the battery cell 002 provided by the embodiments of the present application. Correspondingly, the embodiments of the present application provide 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.

[0087] 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 as to shorten the path of the electrolyte to infiltrate the wound core 001, and thus improve the infiltration efficiency of the battery cell 002; on the other hand, the wound core 001 can have a plurality of liquid inlet parts on the first end 111, and the multiple 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 further improve the infiltration efficiency of the battery cell 002.

[0088] Please refer to Figure 6 , Figure 6 It is a schematic structural diagram of the battery 003 provided by the embodiments of the present application. The embodiments of the present application provide a battery 003, which includes the aforementioned battery cell 002.

[0089] 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.

[0090] 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 as to shorten the path of the electrolyte to infiltrate the wound core 001, and thus improve the manufacturing efficiency of the battery 003; on the other hand, the wound core 001 can have a plurality of liquid inlet parts on the first end 111, and the multiple 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 further improve the manufacturing efficiency of the battery 003.

[0091] 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, and along the axial direction of the core, the core body has a first end; A first pole tab provided at the first end and connected to the first pole piece; Wherein, multiple layers of the first pole tabs are bent and stacked at the first end to form multiple first pole tab regions, and multiple first radially tabless regions and multiple first circumferentially tabless regions are defined; Multiple of the first pole tab regions are circumferentially spaced along the core body, and the first radially tabless region is located between two circumferentially adjacent first pole tab regions; The first pole tab region includes multiple first sub-pole tab regions radially spaced along the core, and the first circumferentially tabless region is located between two radially adjacent first sub-pole tab regions.

2. The core according to claim 1, characterized in that, The central angle of the first radially tabless region is α1, satisfying: 10° ≤ α1 ≤ 45°.

3. The core according to claim 1, characterized in that, The number of the first radially tabless regions is n, satisfying: 2 ≤ n ≤ 6.

4. The core according to claim 1, characterized in that, The circumferential line at half of the outer radius of the core body is disposed opposite to the first circumferentially tabless region.

5. The core roll according to any one of claims 1-4, characterized in that, The width of the first circumferentially tabless region is W1, and the unit thickness of the core body is d0, satisfying: 2d0 ≤ W1 ≤ 8d0, where d0 is the sum of the thickness of one first pole piece, the thickness of one separator, the thickness of one second pole piece, and the thickness of another separator.

6. The core according to any one of claims 1-4, characterized in that Taking the axial direction of the core as the projection direction, the total projected area of the first sub-pole tab regions is S1, and the area of the first end is S, satisfying: 0.5 ≤ S1 / S < 1.

7. The core according to any one of claims 1-4, characterized in that, The outer diameter of the core body is A, the aperture of the middle hole of the core body is φ, multiple of the first pole tab regions are arranged in a common ring along the circumference of the core body, and the outer diameter of the ring where the first pole tab region is located is B, satisfying: B < A; And / or, the inner diameter of the ring where the first pole tab region is located is C, satisfying: C ≥ φ.

8. The core according to any one of claims 1-4, characterized in that, The core further includes a second pole tab, and the core body has a second end opposite to the first end; the second pole tab is provided at the second end and connected to the second pole piece; Wherein, multiple layers of the second pole tabs are bent and stacked at the second end to form multiple second pole tab regions, and multiple second radially tabless regions and multiple second circumferentially tabless regions are defined; Multiple of the second pole tab regions are circumferentially spaced along the core body, and the second radially tabless region is located between two circumferentially adjacent second pole tab regions; The second pole tab region includes multiple second sub-pole tab regions radially spaced along the core, and the second circumferentially tabless region is located between two radially adjacent second sub-pole tab regions.

9. The core according to claim 8, characterized in that, The number of the second pole tab regions is the same as the number of the first pole tab regions, the first pole tab regions and the second pole tab regions correspond one by one, and along the axial direction of the core, the first pole tab region and the corresponding second pole tab region partially overlap.

10. The core according to claim 9, characterized in that, In the circumferential direction of the core body, the second tab area has a deflection angle β relative to the corresponding first tab area, satisfying: 5° ≤ β ≤ 45°.

11. The core according to claim 8, characterized in that, The outer diameter of the core body is A, the aperture diameter of the middle hole of the core body is φ, and the outer diameter of the ring where the second tab area is located is B', satisfying: B' < A; And / or, the inner diameter of the ring where the second tab area is located is C', satisfying: C' ≥ φ.

12. 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 as described in any one of claims 1-11, which is arranged in the accommodation cavity.

13. A battery, characterized in that, Comprising the battery cell as described in claim 12.

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