A spiral core structure that improves space utilization and a battery with it.

Abstract

This utility model discloses a spiral core structure for improving space utilization and a battery having the same. The spiral core structure includes a first electrode, a second electrode, and a separator. The separator is located between the first electrode and the second electrode to isolate them. A first tab is connected to the first electrode, and a second tab is connected to the second electrode. The first electrode, the second electrode, and the separator are wound together to form a spiral core body. The first tab and the second tab are located at the same end of the spiral core body. This utility model has the advantages of saving space and improving space utilization.

Description

Technical Field

[0001] This utility model belongs to the field of battery technology, specifically relating to lithium-ion batteries, and more particularly to a core structure that improves space utilization and a battery having the same. Background Technology

[0002] Currently, the mainstream lithium-ion battery core structure on the market is the wound structure. This structure has advantages such as structural stability, high space utilization, and high production efficiency, and is widely used in the field of micro-sized lithium-ion batteries. In existing designs, the positive and negative tabs of this type of core structure are located at both ends of the core, which results in space being provided at both ends of the core to accommodate the tabs, leading to a significant waste of space within the battery. To optimize space utilization, a core structure that improves space utilization and a battery incorporating it are proposed. Utility Model Content

[0003] This utility model aims to solve at least one of the technical problems existing in the prior art.

[0004] Therefore, this utility model proposes a core structure for improving space utilization and a battery having the same. This core structure for improving space utilization has the advantages of saving space and improving space utilization.

[0005] The space-efficient core structure according to an embodiment of the present invention includes: a first electrode sheet, a second electrode sheet, and a diaphragm. The diaphragm is located between the first electrode sheet and the second electrode sheet to isolate the first electrode sheet and the second electrode sheet. A first electrode tab is connected to the first electrode sheet, and a second electrode tab is connected to the second electrode sheet. The first electrode sheet, the second electrode sheet, and the diaphragm are wound together to form a core body. The first electrode tab and the second electrode tab are located at the same end of the core body.

[0006] According to one embodiment of the present invention, the connection between the first electrode tab and the first electrode sheet is located near the edge of the core body, and the connection between the second electrode tab and the second electrode sheet is located near the center of the core body.

[0007] According to one embodiment of the present invention, the connection between the first electrode tab and the first electrode sheet is located near the edge of the core body, and the connection between the second electrode tab and the second electrode sheet is located near the edge of the core body.

[0008] According to one embodiment of the present invention, the first electrode tab and the second electrode tab are bent along the radial direction of the core body or bent away from the radial direction of the core body.

[0009] According to one embodiment of the present invention, a groove is formed at the bend of the first electrode and the second electrode, the groove being located in the width direction of the first electrode and the second electrode to reduce the width of the bend of the first electrode and the second electrode.

[0010] A battery with a space-efficient core structure, comprising any of the space-efficient core structures described above, further comprising a housing and a cover plate, wherein the core body is disposed within the housing, the cover plate is disposed above the housing, the first tab and the second tab are located at one end near the cover plate, the cover plate comprises a first connecting piece and a second connecting piece, the first tab is connected to the first connecting piece, and the second connecting piece is connected to the second tab.

[0011] According to one embodiment of the present invention, the first connecting piece and the second connecting piece are stacked along the central axis of the core body, and at least a portion of the first connecting piece and the second connecting piece are exposed at both ends of the cover plate.

[0012] According to one embodiment of the present invention, the central axes of the first connecting piece and the second connecting piece are collinear.

[0013] According to one embodiment of the present invention, the first connecting piece is offset from the central axis of the second connecting piece.

[0014] The beneficial effect of this utility model is that by connecting both the first electrode and the second electrode to the same end of the core body, the first electrode and the second electrode share the space of the same thickness layer, avoiding the need to set spaces at both ends of the core body to accommodate the first electrode and the second electrode respectively, thus saving space and improving space utilization.

[0015] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention.

[0016] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0017] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the following description of the embodiments with accompanying drawings, in which:

[0018] Figure 1 This is a schematic diagram of the main structure of the core of this utility model. At this time, the first electrode and the second electrode are arranged opposite to each other, and both are connected to the edge position close to the core body.

[0019] Figure 2This is a schematic diagram of the main structure of the core of this utility model. At this time, the second electrode is connected to the center position near the core body.

[0020] Figure 3 This is a top view of the main structure of the core of this utility model, in which the first electrode lug and the second electrode lug are arranged along the radial direction of the core body;

[0021] Figure 4 This is a top view of the main structure of the core of this utility model, where the first electrode and the second electrode are offset by a certain angle.

[0022] Figure 5 This is a schematic diagram showing the relative positions of the cover plate and the core body of this utility model;

[0023] Figure 6 This is a schematic diagram showing the eccentric arrangement of the first connecting piece and the second connecting piece of the cover plate of this utility model;

[0024] Figure label:

[0025] 1. Core body; 11. First electrode tab; 12. Second electrode tab; 13. Groove; 21. Shell; 22. Cover plate; 221. First connecting piece; 222. Second connecting piece. Detailed Implementation

[0026] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0027] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship shown in the accompanying drawings, 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. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0028] 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.

[0029] The following describes in detail, with reference to the accompanying drawings, a space-efficient core structure and a battery having the same.

[0030] like Figures 1-6 As shown, the space-efficient core structure according to an embodiment of the present invention includes: a first electrode sheet, a second electrode sheet, and a diaphragm. The diaphragm is located between the first electrode sheet and the second electrode sheet to isolate the first electrode sheet and the second electrode sheet. A first electrode tab 11 is connected to the first electrode sheet, and a second electrode tab 12 is connected to the second electrode sheet. The first electrode sheet, the second electrode sheet, and the diaphragm are wound together to form a core body 1. The first electrode tab 11 and the second electrode tab 12 are located at the same end of the core body 1.

[0031] In this embodiment, the first tab 11 and the second tab 12 are the positive and negative tabs, respectively. Specifically, the first tab 11 or the second tab 12 can be set as the positive tab according to requirements. The first tab 11 and the second tab 12 are spaced apart. One end of each tab 11 and the second tab 12 is connected to the core body 1, and the other end is used to connect to the positive and negative terminals of the battery cover, respectively. By connecting both the first tab 11 and the second tab 12 to the same end of the core body 1, the first tab 11 and the second tab 12 share the same thickness layer, avoiding the need to provide space at both ends of the core body 1 to accommodate the first tab 11 and the second tab 12 respectively. This saves space and improves space utilization.

[0032] like Figure 2 As shown, the connection between the first electrode tab 11 and the first electrode sheet is located near the edge of the core body 1, and the connection between the second electrode tab 12 and the second electrode sheet is located near the center of the core body 1.

[0033] like Figure 1 As shown, the connection between the first electrode tab 11 and the first electrode sheet is located near the edge of the core body 1, and the connection between the second electrode tab 12 and the second electrode sheet is located near the edge of the core body 1.

[0034] like Figure 3 As shown, the first tab 11 and the second tab 12 are bent along the radial direction of the core body 1 or as shown in the figure. Figure 4The first tab 11 and the second tab 12 shown are bent off from the radial direction of the core body 1.

[0035] In other words, the positions of the first electrode tab 11 and the second electrode tab 12 can be set according to requirements. For example, the first electrode tab 11 and the second electrode tab 12 can be set opposite each other, and both can be located at the edge of the core body 1. In this case, the bending direction of the first electrode tab 11 and the second electrode tab 12 is inward bending, so that the other end of the first electrode tab 11 and the other end of the second electrode tab 12 are arranged along the radial direction of the core body 1; or the connection between the first electrode tab 11 and the first electrode piece is located near the edge of the core body 1, and the connection between the second electrode tab 12 and the second electrode piece is located near the center of the core body 1. The bending directions of the first electrode 11 and the second electrode 12 are the same. The first electrode 11 and the second electrode 12 can be welded to the cover plate 22 in sequence, and then the cover plate 22 can be connected to the shell 21. If the diameter of the core body 1 is small, the first electrode 11 and the second electrode 12 need to be rotated in opposite directions to deviate from a certain angle when they are set relative to each other, so as to avoid them being on the same straight line, reduce the length restriction of the other end of the first electrode 11 and the second electrode 12, and ensure the area required for welding. The groove 13 is used to reduce the width of the first electrode 11 and the second electrode 12, so that the first electrode 11 and the second electrode 12 can be slightly tilted and bent.

[0036] A groove 13 is formed at the bend of the first electrode 11 and the second electrode 12. The groove 13 is located in the width direction of the first electrode 11 and the second electrode 12 to reduce the width of the bend of the first electrode 11 and the second electrode 12.

[0037] Specifically, when the core body 1 is small in size, and the first tab 11 and the second tab 12 are relatively wide, the first tab 11 and the second tab 12 will be arc-shaped in the width direction before bending. In order to facilitate bending, a groove 13 needs to be formed at the bending point of the first tab 11 and the second tab 12 to reduce the width at this point, so as to facilitate bending and at the same time ensure the welding area.

[0038] A battery with a space-efficient core structure includes any space-efficient core structure, and further includes a housing 21 and a cover plate 22. The core body 1 is disposed inside the housing 21, and the cover plate 22 is disposed above the housing 21. A first tab 11 and a second tab 12 are located at one end near the cover plate 22. The cover plate 22 includes a first connecting piece 221 and a second connecting piece 222. The first tab 11 is connected to the first connecting piece 221, and the second connecting piece 222 is connected to the second tab 12.

[0039] After the core body 1 is placed on the housing 21, the other end of the second electrode lug 12 is bent, and the first electrode lug 11 is initially upright. At this point, the cover plate 22 is placed, and the other end of the first electrode lug 11 contacts the first connecting piece 221. The two are then connected, either by welding or other methods. After connection, the cover plate 22 is placed on top of the housing 21. Under the influence of the cover plate 22, the other end of the first electrode lug 11 is bent and lies on the same plane as the other end of the second electrode lug 12. Then, the cover plate 22 is connected to the housing 21, and the second electrode lug 12 is connected to the second connecting piece 222. The connection between the second electrode lug 12 and the second connecting piece 222 can be achieved by through welding.

[0040] The first connecting piece 221 and the second connecting piece 222 are stacked along the central axis of the core body 1, and at least part of the first connecting piece 221 and the second connecting piece 222 are exposed at both ends of the cover plate 22.

[0041] One end of the cover plate 22 is used to connect the first electrode tab 11 and the second electrode tab 12, and the other end of the cover plate 22 is used to connect the positive and negative electrodes of the device. Therefore, at least a portion of the first connecting piece 221 and the second connecting piece 222 are exposed at both ends of the cover plate 22. The first connecting piece 221 and the second connecting piece 222 are respectively a sheet-like structure and an annular structure, and the size of the sheet-like structure is smaller than that of the annular structure. A portion of the annular structure is exposed through the edge of the sheet-like structure, and a portion of the sheet-like structure is exposed through the through-hole of the annular structure.

[0042] like Figure 5 As shown, the central axes of the first connecting piece 221 and the second connecting piece 222 are collinear. That is, the sheet-like structure and the annular structure are concentrically arranged.

[0043] like Figure 6 As shown, the first connecting piece 221 is offset from the central axis of the second connecting piece 222. That is, when the first connecting piece 221 is a sheet-like structure, the first connecting piece 221 and the second connecting piece 222 are eccentrically positioned.

[0044] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0045] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A core structure for improving space utilization, characterized in that, include: A first electrode, a second electrode, and a diaphragm are provided, the diaphragm being located between the first electrode and the second electrode to isolate the first electrode and the second electrode. A first tab (11) is connected to the first electrode, and a second tab (12) is connected to the second electrode. The first electrode, the second electrode, and the diaphragm are wound together to form a core body (1). The first tab (11) and the second tab (12) are located at the same end of the core body (1).

2. The core structure for improving space utilization according to claim 1, characterized in that, The connection between the first electrode tab (11) and the first electrode sheet is located near the edge of the core body (1), and the connection between the second electrode tab (12) and the second electrode sheet is located near the center of the core body (1).

3. The core structure for improving space utilization according to claim 1, characterized in that, The connection between the first electrode tab (11) and the first electrode sheet is located near the edge of the core body (1), and the connection between the second electrode tab (12) and the second electrode sheet is located near the edge of the core body (1).

4. The core structure for improving space utilization according to claim 1, characterized in that, The first tab (11) and the second tab (12) are bent along the radial direction of the core body (1) or the first tab (11) and the second tab (12) are bent away from the radial direction of the core body (1).

5. The core structure for improving space utilization according to claim 1, wherein A groove (13) is formed at the bend of the first electrode (11) and the second electrode (12). The groove (13) is located in the width direction of the first electrode (11) and the second electrode (12) to reduce the width of the bend of the first electrode (11) and the second electrode (12).

6. A battery having a jelly-roll structure with improved space utilization, comprising the jelly-roll structure with improved space utilization according to any one of claims 1 to 5, characterized in that It also includes a housing (21) and a cover plate (22). The core body (1) is disposed inside the housing (21), and the cover plate (22) is disposed above the housing (21). The first electrode tab (11) and the second electrode tab (12) are located at one end near the cover plate (22). The cover plate (22) includes a first connecting piece (221) and a second connecting piece (222). The first electrode tab (11) is connected to the first connecting piece (221), and the second connecting piece (222) is connected to the second electrode tab (12).

7. The battery with a core structure for improved space utilization according to claim 6, characterized in that, The first connecting piece (221) and the second connecting piece (222) are stacked along the central axis of the core body (1), and at least part of the first connecting piece (221) and the second connecting piece (222) are exposed at both ends of the cover plate (22).

8. The battery having a jelly-roll structure with improved space utilization according to claim 7, wherein The central axes of the first connecting piece (221) and the second connecting piece (222) are collinear.

9. The battery having a jelly-roll structure with improved space utilization according to claim 7, wherein The first connecting piece (221) is offset from the central axis of the second connecting piece (222).

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