Combined tab, battery cell, battery and electric device

Abstract

The utility model provides a combined tab, electric core, battery and electric equipment, wherein, the combined tab of the utility model embodiment includes first sheet body and second sheet body who are arranged in parallel in its thickness direction, first sheet body and second sheet body are connected through welding portion, to make first sheet body and second sheet body form X type structure, the welding portion separates first sheet body into first section and second section, the welding portion separates first sheet body into third section and fourth section, first section and third section correspond, second section and fourth section correspond, the welding portion is equipped with tab rubber, still include nickel sheet, nickel sheet is located between second section and fourth section and is connected with second section and fourth section, the combined tab of the utility model implementation road has the characteristics of high structural strength and long service life.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a combined electrode tab, battery cell, battery and electrical device. Background Technology

[0002] The demand for high energy density in lithium-ion batteries has led research institutions and lithium-ion manufacturers to revolutionize current collector design, gradually resulting in the mass production of "sandwich" structured polymer composite current collectors. These polymer composite current collectors improve both the mass energy density and volumetric energy density of lithium-ion batteries, and also offer significant advantages in improving battery safety. The super-elongation and tensile curling properties of the polymer core layer significantly mitigate mechanical abuse of lithium-ion batteries, preventing the formation of internal short circuits such as burrs and lithium dendrites.

[0003] In related technologies, Y-shaped tabs are typically used to connect composite current collectors. However, the exposed part of the Y-shaped tab is only a single sheet. In addition, the Y-shaped tab usually requires a nickel sheet to be used. Therefore, the welding strength between the Y-shaped tab with only a single sheet and the nickel sheet is low, and the service life is short. Utility Model Content

[0004] To address the issues of low welding strength and short service life between the Y-shaped electrode tab and the nickel sheet in related technologies, this invention provides a combined electrode tab.

[0005] The combined electrode tab of this utility model embodiment includes a first sheet and a second sheet arranged side by side in its thickness direction. The first sheet and the second sheet are connected by a welding part so that the first sheet and the second sheet form an X-shaped structure.

[0006] The welding part divides the first sheet into a first segment and a second segment, and the welding part divides the first sheet into a third segment and a fourth segment, with the first segment and the third segment corresponding to each other, and the second segment and the fourth segment corresponding to each other;

[0007] The welding section is equipped with electrode tab adhesive;

[0008] It also includes a nickel sheet, which is disposed between the second segment and the fourth segment and connected to the second segment and the fourth segment.

[0009] The combined electrode tab of this utility model embodiment is configured with an X-shaped structure for the first and second plates. On the one hand, the first and third segments can respectively connect to the two conductive layers of the composite current collector; on the other hand, the second and fourth segments are simultaneously connected to the nickel sheet, which can greatly improve the connection strength between the nickel sheet and the first and second plates, thereby improving the structural strength of the combined electrode tab of this utility model embodiment and extending its service life.

[0010] Therefore, the combined electrode lugs of this utility model have the characteristics of high structural strength and long service life.

[0011] In some embodiments, the tab adhesive is white glue, black glue, or yellow glue.

[0012] In some embodiments, the thickness of both the first sheet and the second sheet is 0.05-0.1 mm.

[0013] In some embodiments, the thickness of the nickel sheet is 0.1-0.12 mm.

[0014] This utility model also provides a battery cell.

[0015] The battery cell of this utility model embodiment includes:

[0016] An electrode, the electrode comprising a composite current collector, the composite current collector comprising a first conductive layer, an insulating layer and a second conductive layer stacked together;

[0017] As described in the above embodiments, in the combined electrode, the first segment is connected to the first conductive layer, and the third segment is connected to the second conductive layer.

[0018] In some embodiments, the first conductive layer has a first active material layer on the side opposite to the insulating layer, and the second conductive layer has a second active material layer on the side opposite to the insulating layer.

[0019] In some embodiments, when the electrode is a positive electrode, the combined electrode tab is a positive electrode tab, and both the first sheet and the second sheet are aluminum sheets.

[0020] In some embodiments, when the electrode is a negative electrode, the combined electrode tab is a negative electrode tab, and both the first sheet and the second sheet are copper sheets with a nickel layer plated on their surfaces.

[0021] This utility model also provides a battery.

[0022] The battery of this utility model embodiment includes the battery cell described in the above embodiment.

[0023] This utility model also provides an electrical device.

[0024] The electrical equipment in this embodiment of the utility model includes the battery described in the above embodiment. Attached Figure Description

[0025] 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.

[0026] Figure 1 This is a schematic diagram of the structure of the combined electrode tab according to an embodiment of the present invention.

[0027] In the picture:

[0028] 1. First section; 101. First paragraph; 102. Second paragraph;

[0029] 2. Second section; 201. Third section; 202. Fourth section;

[0030] 3. Nickel sheet;

[0031] 4. Ear tape;

[0032] 5. Electrode; 501. First conductive layer; 502. Second conductive layer; 503. Insulating layer; 504. First active material layer; 505. Second active material layer. Detailed Implementation

[0033] 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.

[0034] 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.

[0035] 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 encapsulation 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.

[0036] The following is in conjunction with the appendix Figure 1 This invention describes a combined electrode tab according to an embodiment of the present invention.

[0037] like Figure 1 As shown, the combined electrode tab of this utility model embodiment includes a first sheet 1 and a second sheet 2 arranged side by side in its thickness direction. The first sheet 1 and the second sheet 2 are connected by a welding part so that the first sheet 1 and the second sheet 2 form an X-shaped structure.

[0038] The welding part divides the first piece 1 into a first segment 101 and a second segment 102, and the welding part divides the second piece 2 into a third segment 201 and a fourth segment 202. The first segment 101 and the third segment 201 correspond to each other, and the second segment 102 and the fourth segment 202 correspond to each other.

[0039] The welding part is equipped with electrode tab adhesive 4;

[0040] It also includes a nickel sheet 3, which is disposed between and connected to the second segment 102 and the fourth segment 202. In use, the first segment 101 and the third segment 201 are fixed on both sides of the composite current collector, and the first segment 101 and the third segment 201 are respectively connected to the first conductive layer 501 and the second conductive layer 502 on both sides of the composite current collector, so as to realize the combined electrode tab to conduct the two sides of the composite current collector.

[0041] The combined electrode tab of this utility model embodiment is configured with an X-shaped structure for the first plate 1 and the second plate 2. On the one hand, the first segment 101 and the third segment 201 can respectively connect the two conductive layers of the composite current collector (i.e., the first conductive layer 501 and the second conductive layer 502); on the other hand, the second segment 102 and the fourth segment 202 are simultaneously connected to the nickel sheet 3, which can greatly improve the welding strength between the nickel sheet 3 and the first plate 1 and the second plate 2, thereby improving the structural strength of the combined electrode tab of this utility model embodiment and extending the service life of the combined electrode tab of this utility model embodiment.

[0042] Therefore, the combined electrode lugs of this utility model have the characteristics of high structural strength and long service life.

[0043] In some embodiments, the tab adhesive 4 is white glue, black glue, or yellow glue.

[0044] It is understandable that the type of tab adhesive 4 can be determined according to actual needs.

[0045] In some embodiments, the thickness of the first sheet 1 and the second sheet 2 is both 0.05-0.1 mm.

[0046] Optionally, the thickness of the first sheet 1 and the second sheet 2 can be 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, or 0.1mm.

[0047] In some embodiments, the thickness of the nickel sheet 3 is 0.1-0.12 mm.

[0048] Optionally, the thickness of the nickel sheet 3 can be 0.1 mm, 0.11 mm, or 0.12 mm.

[0049] This utility model also provides a battery cell.

[0050] The battery cell of this utility model embodiment includes an electrode 5 and a combined electrode tab as described in the above embodiment.

[0051] As shown in the figure, the electrode 5 includes a composite current collector, which includes a first conductive layer 501, an insulating layer 503 and a second conductive layer 502 stacked together.

[0052] The first segment 101 is connected to the first conductive layer 501, and the third segment 201 is connected to the second conductive layer 502.

[0053] It is understood that there are two electrodes 5, namely a positive electrode and a negative electrode. One or both of the positive and negative electrodes may include the above-mentioned composite current collector and are provided with the combined electrode tabs described in the above embodiments.

[0054] In some embodiments, the first conductive layer 501 has a first active material layer 504 on the side opposite to the insulating layer 503, and the second conductive layer 502 has a second active material layer 505 on the side opposite to the insulating layer 503.

[0055] In some embodiments, when the electrode 5 is a positive electrode 5, the combined electrode tab is a positive electrode tab, and the first plate 1 and the second plate 2 are both aluminum plates.

[0056] In some embodiments, when the electrode 5 is a negative electrode 5, the combined electrode tab is a negative electrode tab, the first plate 1 and the second plate 2 are both copper plates, and the surfaces of the first plate 1 and the second plate 2 are plated with a nickel layer.

[0057] This utility model also provides a battery.

[0058] The battery of this utility model embodiment includes the battery cell described in the above embodiment.

[0059] This utility model also provides an electrical device.

[0060] The electrical equipment in this embodiment includes the battery described in the above embodiment.

[0061] 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 combined electrode tab, characterized in that, It includes a first sheet (1) and a second sheet (2) arranged side by side in its thickness direction, the first sheet (1) and the second sheet (2) being connected by a welding part so that the first sheet (1) and the second sheet (2) form an X-shaped structure; The welding part divides the first piece (1) into a first segment (101) and a second segment (102), and the welding part divides the first piece (1) into a third segment (201) and a fourth segment (202), the first segment (101) and the third segment (201) correspond to each other, and the second segment (102) and the fourth segment (202) correspond to each other; The welding part is provided with tab adhesive (4); It also includes a nickel sheet (3), which is disposed between the second segment (102) and the fourth segment (202) and connected to the second segment (102) and the fourth segment (202).

2. The combined electrode tab according to claim 1, characterized in that, The tab adhesive (4) is white glue, black glue, or yellow glue.

3. The combined electrode tab according to claim 1, characterized in that, The thickness of the first sheet (1) and the second sheet (2) is 0.05-0.1 mm.

4. The combined electrode tab according to claim 1, characterized in that, The thickness of the nickel sheet (3) is 0.1-0.12 mm.

5. A battery cell, characterized in that, include: The electrode (5) includes a composite current collector, which includes a first conductive layer (501), an insulating layer (503), and a second conductive layer (502) stacked together. The combined tab as described in any one of claims 1-4, wherein the first segment (101) is connected to the first conductive layer (501), and the third segment (201) is connected to the second conductive layer (502).

6. The battery cell according to claim 5, characterized in that, The first conductive layer (501) has a first active material layer (504) on the side opposite to the insulating layer (503), and the second conductive layer (502) has a second active material layer (505) on the side opposite to the insulating layer (503).

7. The battery cell according to claim 5, characterized in that, When the electrode (5) is a positive electrode (5), the combined electrode tab is a positive electrode tab, and the first sheet (1) and the second sheet (2) are both aluminum sheets.

8. The battery cell according to claim 5, characterized in that, When the electrode (5) is a negative electrode (5), the combined electrode tab is a negative electrode tab, the first sheet (1) and the second sheet (2) are both copper sheets and the surfaces of the first sheet (1) and the second sheet (2) are plated with a nickel layer.

9. A battery, characterized in that, Includes the battery cell as described in any one of claims 5-8.

10. An electrical appliance, characterized in that, Includes the battery as described in claim 9.

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