Connecting structure of pole piece and pole lug of cylindrical button battery

Abstract

The utility model discloses a pole piece and pole lug connecting structure of a cylindrical button battery, which comprises a pole piece, a pole lug and an adhesive tape, the tab is welded on the pole piece so as to form an ultra-welding weld mark; and the adhesive tape is attached to the tab and the pole piece. According to the connecting structure of the pole piece and the pole lug of the cylindrical button battery, the pole lug is welded on the pole piece to form the super-welding weld mark, and the adhesive tape is adhered after welding, so that the problem that the pole piece is easy to crack when the pole piece resists the impact of external force due to the too small width of the pole piece can be effectively solved; the pull force between the tab and the pole piece can be effectively reduced, the connection reliability is improved, and the service life of the button battery is further prolonged.

Description

Technical Field

[0001] This utility model relates to the field of cylindrical button batteries, and in particular to a connection structure between the electrode sheet and the tab of a cylindrical button battery. Background Technology

[0002] The current technological trend for button cell lithium-ion batteries is towards miniaturization, with both cell diameter and height becoming smaller. In particular, as the cell height decreases, the width of the positive and negative electrode plates also decreases.

[0003] Electrode breakage is a common problem during the manufacturing process of lithium-ion button cells. This is mainly because the electrode width of button lithium-ion cells is small, making them prone to cracking when subjected to external impact. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a connection structure between the electrode sheet and the tab of a cylindrical button battery.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] A cylindrical button cell electrode and tab connection structure includes:

[0007] The electrode includes an active material region and an empty foil region;

[0008] A tab, wherein the tab is soldered to the empty foil area of ​​the electrode sheet to form a super solder mark; and

[0009] Adhesive tape is attached to the tabs and the electrode sheet.

[0010] In one embodiment, the width of the electrode is 2mm to 5mm.

[0011] In one embodiment, the electrode lug includes a steel shell welded portion and an electrode lug welded portion, the steel shell welded portion being connected to the electrode lug welded portion, and the steel shell welded portion and the electrode lug welded portion being an integral structure.

[0012] In one embodiment, the tape is attached to the active material region and the empty foil region of the electrode.

[0013] In one embodiment, the steel shell weld is circular or T-shaped.

[0014] In one embodiment, when the welded part of the steel shell is circular, its diameter is 3mm to 8mm; or

[0015] When the welded part of the steel shell is T-shaped, the width of the T-shaped end is 3mm to 8mm.

[0016] In one embodiment, the width of the electrode tab weld portion is 1.5mm to 2.5mm.

[0017] In one embodiment, the width of the super solder mark is 1 mm to 2.5 mm.

[0018] In one embodiment, the distance between the super solder mark and the upper edge of the electrode is 0.2 mm to 2 mm.

[0019] In one embodiment, the distance between the super solder mark and the upper edge of the electrode is 0.2mm to 2mm, and the distance between the tab and the lower edge of the electrode is 0.5mm to 3mm.

[0020] In one embodiment, the distance between the super solder mark and the edge of the tab is 0 to 1.5 mm.

[0021] The advantages and beneficial effects of this utility model compared to the prior art are as follows:

[0022] This utility model relates to a connection structure between the electrode sheet and the tab of a cylindrical button battery. By welding the tab onto the electrode sheet to form a super-soldering mark, and then applying adhesive tape after welding, the problem of electrode sheet cracking due to its small width when subjected to external impact can be effectively reduced. By setting up structures such as adhesive tape, the tensile force between the tab and the electrode sheet can be effectively reduced, improving the reliability of the connection and thus extending the service life of the button battery. The connection between the electrode sheet, the tab, and the adhesive tape can effectively prevent cracks from appearing at the connection point between the electrode sheet and the adhesive tape, thereby improving reliability and connection stability. Attached Figure Description

[0023] Figure 1 This is a structural diagram of the connection structure between the cylindrical button battery electrode and the tab according to one embodiment of the present invention.

[0024] Figure 2 for Figure 1 The diagram shows the structural structure of the connection between the cylindrical button cell electrode and the tab. Detailed Implementation

[0025] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of this utility model. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0026] Please see Figures 1-2A cylindrical button cell electrode and tab connection structure includes: an electrode 100, a tab 200, and an adhesive tape 300. The electrode 100 is an elongated strip structure, comprising an active material region 110 and an empty foil region 120. The tab is welded to the empty foil region of the electrode to form a super-soldering mark 201. The adhesive tape is attached to the tab and the electrode. Further, the adhesive tape is attached to both the active material region and the empty foil region of the electrode, with the tape adhering to the active material region, thus forming an overlap 130 between the tape and the active material region of the electrode, which improves connection reliability. The electrode has active material attached to its active material region, and the end connected to the tab 200 is the empty foil region, exposing the electrode (i.e., without surface active material). This allows for direct welding of the electrode and tab, enhancing weld adhesion and improving connection reliability.

[0027] Please see Figure 2 In this embodiment, the width A of the electrode sheet is 2mm to 5mm. The width B of the electrode tab welding portion is 1.5mm to 2.5mm. The width C of the super-solder mark is 1mm to 2.5mm. The distance F between the super-solder mark and the upper edge of the electrode sheet is 0.2mm to 2mm. The distance G between the electrode tab and the lower edge of the electrode sheet is 0.5mm to 3mm. Thus, by accurately setting the width of the electrode sheet, the width of the electrode tab, the width of the super-solder mark, the distance between the super-solder mark and the upper edge of the electrode sheet, and the distance between the electrode tab and the lower edge of the electrode sheet, the tensile force can be effectively reduced. Furthermore, the connection between the electrode sheet 100, the electrode tab 200, and the tape 300 can effectively prevent cracks from appearing at the connection point between the electrode sheet 100 and the tape 300, thereby improving reliability and connection stability.

[0028] In another embodiment, the distance between the super-soldering stamp and the edge of the tab is 0-1.5 mm. Further, the distance E between the super-soldering stamp and the left edge of the tab is 0-1.5 mm. Preferably, the distance E between the stamp and the left edge of the tab is 0.6 mm-0.8 mm. Thus, by reducing the width of the tab welded to the electrode sheet through the shape of the tab; positioning the upper and side parts of the solder stamp; extending the adhesive to the material-containing area; protecting the electrode sheet from being pulled by impact forces; and considering the distance E between the solder stamp and the left edge of the tab, as well as the shape of the tab, the risk of electrode sheet breakage can be effectively prevented.

[0029] It should be noted that the electrode tab 200 includes a steel shell welded portion 220 and an electrode tab welded portion 210. The steel shell welded portion is connected to the electrode tab welded portion, and the steel shell welded portion and the electrode tab welded portion are an integral structure. Further, the steel shell welded portion is circular or T-shaped. Further, when the steel shell welded portion is circular, its diameter F is 3mm to 8mm; or when the steel shell welded portion is T-shaped, the width of its T-shaped end is 3mm to 8mm.

[0030] The electrode tab connecting to the housing or cover plate can be round or T-shaped. By setting it to round or T-shaped, the electrode tab can be easily welded to the cover plate or housing.

[0031] The above-described embodiments are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A connection structure between a cylindrical button cell electrode and a tab, characterized in that, include: The electrode includes an active material region and an empty foil region; The electrode tab is welded to the empty foil area of ​​the electrode sheet to form a super solder mark; and Adhesive tape is attached to the tabs and the electrode sheet, and the adhesive tape is attached to the active material area and the empty foil area of ​​the electrode sheet.

2. The cylindrical button battery electrode and tab connection structure according to claim 1, characterized in that, The width of the electrode is 2mm to 5mm.

3. The cylindrical button battery electrode and tab connection structure according to claim 1, characterized in that, The electrode lug includes a steel shell welded part and an electrode lug welded part. The steel shell welded part is connected to the electrode lug welded part, and the steel shell welded part and the electrode lug welded part are an integral structure.

4. The cylindrical button battery electrode and tab connection structure according to claim 3, characterized in that, The welded part of the steel shell is circular or T-shaped.

5. The cylindrical button battery electrode and tab connection structure according to claim 4, characterized in that, When the welded part of the steel shell is circular, its diameter is 3mm~8mm; or When the welded part of the steel shell is T-shaped, the width of the T-shaped end is 3mm to 8mm.

6. The cylindrical button battery electrode and tab connection structure according to claim 3, characterized in that, The width of the welding portion of the electrode tab is 1.5mm to 2.5mm.

7. The cylindrical button battery electrode and tab connection structure according to claim 1, characterized in that, The width of the super-welded stamp is 1mm to 2.5mm.

8. The cylindrical button battery electrode and tab connection structure according to claim 1, characterized in that, The distance between the super solder mark and the upper edge of the electrode is 0.2mm to 2mm, and the distance between the tab and the lower edge of the electrode is 0.5mm to 3mm.

9. The cylindrical button battery electrode and tab connection structure according to claim 1, characterized in that, The distance between the super-welded stamp and the edge of the electrode tab is 0~1.5mm.

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