Winding core and battery
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHENZHEN HIGHPOWER TECH CO LTD
- Filing Date
- 2025-08-28
- Publication Date
- 2026-08-07
AI Technical Summary
[0003]本实用新型所要解决的技术问题是：针对现有的卷芯能量密度小的问题，提供一种卷芯及电池
[0014]本实用新型实施例提供的一种卷芯及电池，与现有技术相比，至少具备有以下有益效果：该卷芯，由于卷芯在卷芯的卷绕方向所在的平面上划分为第一半区和第二半区，位于第二半区的正极片的第一端突出位于第一半区的正极片的第一端，位于第二半区的负极片的第一端突出位于第一半区的负极片的第一端，连接于正极片第一端的正极耳以及连接于负极片第一端的负极耳均位于第一半区，使得位于第二半区的正极片、隔膜以及负极片能够填充壳体的部分极耳预留容置区，减少了壳体的部分极耳预留容置区的空间损失，相较于现有的同尺寸的卷芯，提升了卷芯的能量密度。
Smart Images
Figure CN224609878U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of battery technology, and in particular relates to a winding core and a battery. Background Technology
[0002] The advantages of multi-tab cells are that they can achieve faster charging and higher discharge rates. Due to their lower internal resistance, they also experience less temperature rise during charging and discharging compared to conventional tab cells. Multi-tab cells are classified into full-tab and half-tab cells based on the number of tabs. A suitable multi-tab structure is selected based on charging and discharging requirements, as well as temperature rise requirements. The head of the multi-tab cell casing needs to have a certain amount of space reserved (tab pre-reservation area) to accommodate the tabs, which leads to a loss of effective space in the cell's height direction. Compared to conventional tab cells of the same size, multi-tab cells often have a lower energy density. Utility Model Content
[0003] The technical problem to be solved by this utility model is to provide a winding core and battery to address the issue of low energy density in existing winding cores.
[0004] To address the aforementioned issues, one embodiment of this utility model provides a winding core, comprising a positive electrode sheet, a negative electrode sheet, and a separator. The separator is located between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet, the separator, and the negative electrode sheet are sequentially stacked and wound to form the winding core. The winding core is divided into a first half-region and a second half-region on the plane where the winding direction of the winding core is located. At the first end in the direction of core height: The first end of the positive electrode plate located in the second half-region protrudes from the first end of the positive electrode plate located in the first half-region, and the first end of the negative electrode plate located in the second half-region protrudes from the first end of the negative electrode plate located in the first half-region. A positive electrode tab is connected to the first end of the positive electrode sheet located in the first half-region, and the projection of the positive electrode tab in the thickness direction of the core is at least partially located on the positive electrode sheet in the second half-region; A negative electrode tab is connected to the first end of the negative electrode sheet located in the first half-region, and the projection of the negative electrode tab in the thickness direction of the core is at least partially located on the negative electrode sheet in the second half-region.
[0005] As a further improvement to the above technical solution: In the direction of the core height: Optionally, the first end of the positive electrode tab protrudes beyond the first end of the positive electrode plate located in the second half-region; the first end of the negative electrode tab protrudes beyond the first end of the negative electrode plate located in the second half-region.
[0006] Optionally, the height of the positive electrode located in the second half-region is greater than the height of the positive electrode located in the first half-region; The height of the negative electrode located in the second half-region is greater than the height of the negative electrode located in the first half-region.
[0007] Optionally, the second end of the positive electrode located in the second half-region is flush with the second end of the positive electrode located in the first half-region; The second end of the negative electrode located in the second half-region is flush with the second end of the negative electrode located in the first half-region.
[0008] Optionally, the height of the diaphragm located in the second half-region is greater than the height of the diaphragm located in the first half-region; The second end of the diaphragm located in the second half-region is flush with the second end of the diaphragm located in the first half-region.
[0009] Optionally, the height of the second half of the winding core is less than the height of the battery casing located in the tab reserved accommodating area.
[0010] Optionally, the positive electrode tab and the negative electrode tab are offset in the width direction of the winding core.
[0011] Optionally, a plurality of positive tabs are electrically connected to the first end of the positive electrode sheet, and the plurality of positive tabs are arranged sequentially and electrically connected along the thickness direction of the winding core.
[0012] Optionally, the first end of the negative electrode sheet is electrically connected to a plurality of negative electrode tabs, which are arranged sequentially and electrically connected along the thickness direction of the winding core.
[0013] On the other hand, this utility model embodiment provides a battery, including a housing and a winding core as described above, the winding core being installed inside the housing, and the positive electrode tab and the negative electrode tab being located in the electrode tab reserved accommodating area of the housing.
[0014] The present invention provides a winding core and battery, which, compared with the prior art, has at least the following beneficial effects: The winding core is divided into a first half-region and a second half-region on the plane where the winding direction is located. The first end of the positive electrode sheet located in the second half-region protrudes from the first end of the positive electrode sheet located in the first half-region, and the first end of the negative electrode sheet located in the second half-region protrudes from the first end of the negative electrode sheet located in the first half-region. The positive electrode tab connected to the first end of the positive electrode sheet and the negative electrode tab connected to the first end of the negative electrode sheet are both located in the first half-region. This allows the positive electrode sheet, separator, and negative electrode sheet located in the second half-region to fill part of the electrode tab reserved accommodating area of the casing, reducing the space loss of part of the electrode tab reserved accommodating area of the casing. Compared with existing winding cores of the same size, this improves the energy density of the winding core. Attached Figure Description
[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0016] Figure 1 This is a schematic diagram of the structure of the winding core provided in one embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the core electrode sheet when it is unfolded according to one embodiment of the present invention; Figure 3 This is a partial structural diagram of the electrode sheet of the core provided in one embodiment of the present invention when it is unfolded. Figure 4 yes Figure 1 A cross-sectional view of the positive and negative electrodes.
[0017] The reference numerals in the accompanying drawings are as follows: 100. Core; 110. Positive electrode plate; 111. Positive electrode tab; 120. Negative electrode plate; 120. Negative electrode tab; 130. Separator; a. First half-region; b. Second half-region. Detailed Implementation
[0018] To make the technical problems solved, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.
[0019] In the description of this utility model, it should be understood that the terms "longitudinal," "radial," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.
[0020] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0021] Figure 1 This is a top view of the core structure provided in one embodiment of the present invention.
[0022] Figure 2 This is a schematic diagram of the structure of the electrode sheet of the core provided in one embodiment of the present utility model when it is unfolded; wherein the numbers 1, 2, 3, 4, 5, 6, 7, ..., 2n, 2n+1 marked on the figure refer to the number of folds of the electrode sheet. When the number of folds is odd, it is located in the second half of the core 100 when it is wound, and when the number of folds is even, it is located in the first half of the core 100 when it is wound. Figure 2 This is a structure used only for electrodes, and it does not restrict the number of folds that need to be odd.
[0023] Figure 3 This is a partial structural diagram of the electrode sheet of the core provided in one embodiment of the present invention when it is unfolded, showing only two adjacent folds.
[0024] Figure 4 yes Figure 1 The diagram shows the cross-sectional view of the positive and negative electrodes (AA section), omitting the separator and only illustrating the cross-sectional view of the positive and negative electrodes.
[0025] like Figures 1 to 4 As shown, one embodiment of the present invention provides a core 100, which includes a positive electrode 110, a negative electrode 120, and a separator 130. The separator 130 is located between the positive electrode 110 and the negative electrode 120. The positive electrode 110, the separator 130, and the negative electrode 120 are stacked and wound sequentially to form the core 100. The core 100 is divided into a first half-region and a second half-region on the plane where the winding direction of the core 100 is located.
[0026] At the first end in the height direction of the core 100: The first end of the positive electrode 110 located in the second half-region protrudes from the first end of the positive electrode 110 located in the first half-region, and the first end of the negative electrode 120 located in the second half-region protrudes from the first end of the negative electrode 120 located in the first half-region. A positive electrode tab 111 is connected to the first end of the positive electrode sheet 110 located in the first half region. The projection of the positive electrode tab 111 in the thickness direction of the core 100 is at least partially located on the positive electrode sheet 110 in the second half region. A negative electrode tab 120 is connected to the first end of the negative electrode sheet 120 located in the first half of the region. The projection of the negative electrode tab 120 in the thickness direction of the core 100 is at least partially located on the negative electrode sheet 120 in the second half of the region.
[0027] The core 100 is divided into a first half and a second half on the plane where the winding direction of the core 100 is located. The first end of the positive electrode 110 located in the second half protrudes from the first end of the positive electrode 110 located in the first half, and the first end of the negative electrode 120 located in the second half protrudes from the first end of the negative electrode 120 located in the first half. The positive electrode tab 111 connected to the first end of the positive electrode 110 and the negative electrode tab 120 connected to the first end of the negative electrode 120 are both located in the first half. This increases the height of the positive electrode 110 and the negative electrode 120 in the second half, so that the positive electrode 110, the separator 130 and the negative electrode 120 located in the second half can fill part of the electrode tab reserved accommodating area of the shell, reducing the space loss of part of the electrode tab reserved accommodating area of the shell. Compared with the existing core 100 of the same size, the energy density of the core 100 is improved.
[0028] When the core 100 needs to be manufactured, the positive electrode 110, the separator 130 and the negative electrode 120 are first stacked in sequence, and then the stacked positive electrode 110, separator 130 and negative electrode 120 are wound to form the core 100. The core 100 is divided into a first half region a and a second half region b on the plane where the winding direction of the core 100 is located. The positive electrode tab 111 electrically connected to the first end of the positive electrode 110 and the negative electrode tab 120 electrically connected to the first end of the negative electrode 120 are both located in the first half region a, and the first ends of the positive electrode 110, separator 130 and negative electrode 120 located in the second half region b protrude from the first ends of the positive electrode 110, separator 130 and negative electrode 120 located in the first half region a.
[0029] When the core 100 needs to be assembled into the battery casing, the core 100 is placed inside the battery casing, and the positive tab 111 and the negative tab 120 are located in the upper half of the tab reserved accommodating area of the casing, while the positive electrode 110, the separator 130 and the negative electrode 120 located in the second half-region b fill the lower half of the tab reserved accommodating area of the casing.
[0030] Please refer to the embodiment of the present invention for the core 100 provided. Figure 2 , Figure 3 as well as Figure 4 In the height direction of the core 100: the first end of the positive electrode tab 111 protrudes outside the first end of the positive electrode sheet 110 located in the second half region; the first end of the negative electrode tab 120 protrudes outside the first end of the negative electrode sheet 120 located in the second half region, so as to facilitate the positive electrode tab 111 and the negative electrode tab 120 to be electrically connected and fixed to the battery casing.
[0031] In this embodiment, please refer to Figure 2 , Figure 3 as well as Figure 4 The height of the positive electrode 110 in the second half-region is greater than the height of the positive electrode 110 in the first half-region; the height of the negative electrode 120 in the second half-region is greater than the height of the negative electrode 120 in the first half-region. The second end of the positive electrode 110 in the second half-region is flush with the second end of the positive electrode 110 in the first half-region; the second end of the negative electrode 120 in the second half-region is flush with the second end of the negative electrode 120 in the first half-region. The height of the separator 130 in the second half-region is greater than the height of the separator 130 in the first half-region; the second end of the separator 130 in the second half-region is flush with the second end of the separator 130 in the first half-region.
[0032] Specifically, the height difference between the positive electrode 110 located in the second half-region and the positive electrode 110 located in the first half-region is H0; the height difference between the negative electrode 120 located in the second half-region and the negative electrode 120 located in the first half-region is H0.
[0033] To facilitate the assembly of the core 100 into the battery casing, the height of the positive electrode 110, separator 130, and negative electrode 120 located in the second half-region b is less than the height of the battery casing in the tab reserved accommodating area. This avoids the situation where the height of the positive electrode 110, separator 130, and negative electrode 120 located in the second half-region b is greater than the height of the battery casing in the tab reserved accommodating area, which would make assembly of the core 100 into the battery casing difficult.
[0034] In this embodiment, the positive tab 111 and the negative tab 120 are offset radially from the core 100. Multiple positive tabs 111 are electrically connected to the top of the positive electrode 110, and multiple negative tabs 120 are electrically connected to the top of the negative electrode 120. The multiple positive tabs 111 and multiple negative tabs 120 facilitate charging and discharging of the positive electrode 110 and negative electrode 120, improving charging and discharging efficiency. In a specific embodiment, the multiple positive tabs 111 are arranged sequentially radially from the core 100, and the multiple negative tabs 120 are arranged sequentially radially from the core 100. Both the positive tabs 111 and the negative tabs 120 are nickel sheets.
[0035] In addition, such as Figures 1 to 4 As shown, another embodiment of this utility model provides a battery, which includes a casing and a winding core 100 as provided in any of the above embodiments. The winding core 100 is installed inside the casing, and the positive electrode tab 111 and the negative electrode tab 120 are located in the electrode tab reserved accommodating area of the casing. The specific structure of the winding core 100 is the same as that in the above embodiments. Since this battery adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.
[0036] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be included within the protection scope of this utility model.
Claims
1. A type of winding core, characterized in that, It includes a positive electrode, a negative electrode, and a separator, the separator being located between the positive electrode and the negative electrode. The positive electrode, the separator, and the negative electrode are sequentially stacked and wound to form the core. The core is divided into a first half-region and a second half-region on the plane where the winding direction of the core is located. At the first end in the direction of core height: The first end of the positive electrode plate located in the second half-region protrudes from the first end of the positive electrode plate located in the first half-region, and the first end of the negative electrode plate located in the second half-region protrudes from the first end of the negative electrode plate located in the first half-region. A positive electrode tab is connected to the first end of the positive electrode sheet located in the first half-region, and the projection of the positive electrode tab in the thickness direction of the core is at least partially located on the positive electrode sheet in the second half-region; A negative electrode tab is connected to the first end of the negative electrode sheet located in the first half-region, and the projection of the negative electrode tab in the thickness direction of the core is at least partially located on the negative electrode sheet in the second half-region.
2. The winding core according to claim 1, characterized in that, In the direction of the core height: The first end of the positive electrode tab protrudes outside the first end of the positive electrode plate located in the second half-region; the first end of the negative electrode tab protrudes outside the first end of the negative electrode plate located in the second half-region.
3. The winding core according to claim 1, characterized in that, The height of the positive electrode plate located in the second half-region is greater than the height of the positive electrode plate located in the first half-region; The height of the negative electrode located in the second half-region is greater than the height of the negative electrode located in the first half-region.
4. The winding core according to claim 3, characterized in that, The second end of the positive electrode plate located in the second half-region is flush with the second end of the positive electrode plate located in the first half-region; The second end of the negative electrode located in the second half-region is flush with the second end of the negative electrode located in the first half-region.
5. The winding core according to claim 3, characterized in that, The height of the diaphragm located in the second half-region is greater than the height of the diaphragm located in the first half-region; The second end of the diaphragm located in the second half-region is flush with the second end of the diaphragm located in the first half-region.
6. The winding core according to claim 1, characterized in that, The height of the second half of the winding core is less than the height of the battery casing located in the tab reserved accommodating area.
7. The winding core according to claim 1, characterized in that, The positive electrode tab and the negative electrode tab are offset in the width direction of the winding core.
8. The winding core according to claim 1, characterized in that, The first end of the positive electrode sheet is electrically connected to a plurality of positive electrode tabs, which are arranged sequentially and electrically connected along the thickness direction of the core.
9. The winding core according to claim 1, characterized in that, The first end of the negative electrode sheet is electrically connected to a plurality of negative electrode tabs, which are arranged sequentially and electrically connected along the thickness direction of the winding core.
10. A battery, characterized in that, The device includes a housing and a core as described in any one of claims 1 to 9, the core being installed within the housing, and the positive and negative tabs being located in the tab reserved accommodating area of the housing.