Button type battery cell with positive electrode-to-nickel conversion area hidden in main body

Abstract

The utility model discloses a button type battery cell with a positive electrode-to-nickel conversion area hidden in a main body, and relates to the technical field of batteries. Comprising a roll core, a positive pole lug and a negative pole lug, the positive pole lug and the negative pole lug are located on the two sides of the roll core and connected with the roll core, the positive pole lug comprises an aluminum pole lug and a nickel pole lug, one end of the aluminum pole lug and one end of the nickel pole lug are partially overlapped and welded, the welding part is a nickel conversion area, and the nickel conversion area is covered with pole lug glue. According to the utility model, the nickel conversion area is completely covered by the tab glue and is hidden in the battery cell main body, so that the risk that the nickel conversion position of the tab is exposed to cause that the nickel conversion area cannot be bent at a specified position or the tab is broken is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a positive pole turns nickel area hides the button type electric core in the main body. BACKGROUND

[0002] With the continuous development of electronic products, the technical requirements of the power provider - battery used by it are also higher and higher. Lithium battery has been widely used because of its advantages of lighter, thinner, longer cycle life, good safety performance, high energy density, stable discharge platform, excellent power performance, environmental protection and no pollution.

[0003] The tab is one of the main raw materials for battery production, which is mainly used to lead out the positive and negative poles from the electric core, that is, to act as the contact point when the battery is charged and discharged. The tab of the negative pole of the battery generally uses a nickel strip, and the tab of the positive pole generally uses an aluminum strip. In order to better meet the welding needs of the product, a nickel strip needs to be laser welded on the aluminum tab. The process of welding a nickel strip on the prepared aluminum tab is called "aluminum to nickel". The nickel strip has good weldability and can meet the requirements of conventional soldering, resistance welding and laser welding.

[0004] Due to the softness of aluminum material and the thinness of the tab, when the tab is exposed, the tab turning nickel position affects the bending at the specified position or the risk of tab breakage, which cannot meet the production needs. INVENTION CONTENTS

[0005] The utility model mainly aims at providing a button type electric core with positive pole turning nickel area hidden in the main body to solve the above problems.

[0006] In order to achieve the above purpose, the utility model provides a button type electric core with positive pole turning nickel area hidden in the main body, which comprises a winding core, a positive pole tab and a negative pole tab. The positive pole tab and the negative pole tab are located on the side of the winding core and connected with the winding core. The positive pole tab comprises an aluminum tab and a nickel tab. One end of the aluminum tab and the nickel tab is partially overlapped and welded. The welded part is the nickel turning area. The nickel turning area is covered with a tab rubber.

[0007] Further, it also comprises an electric core aluminum plastic film shell. The winding core is arranged in the electric core aluminum plastic film shell. The positive pole tab and the negative pole tab are connected with the winding core through the electric core aluminum plastic film shell.

[0008] Further, the outer side of the electric core aluminum plastic film shell is provided with an edge sealing. The edge sealing is provided with a pleated edge sealing and closely attached to the side body of the electric core aluminum plastic film shell, forming a pleated skirt shape. The positive pole tab and the negative pole tab are extended from the edge sealing. The nickel turning area is located between the aluminum plastic film packaging area on the electric core aluminum plastic film shell and the winding core.

[0009] Further, the aluminum tab and the nickel tab are connected by laser welding.

[0010] Further, the laser welding spot is arranged vertically along the width direction of the nickel conversion area.

[0011] The utility model has the following beneficial effects:

[0012] The utility model discloses a positive pole nickel conversion area is arranged in the electric core main body and is covered completely by the tab rubber, avoids that the electrolyte in the electric core is immersed in the nickel conversion position and causes the nickel tab to be corroded, and the length control difficulty of the aluminum nickel conversion position is solved and the risk of being broken easily. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a schematic view of the utility model discloses a kind of positive pole nickel conversion area hides main body's button type electric core;

[0014] Figure 2 It is the positive pole tab schematic view of the utility model discloses a kind of positive pole nickel conversion area hides main body's button type electric core;

[0015] Figure 3 It is the sectional view of the utility model discloses a kind of positive pole nickel conversion area hides main body's button type electric core;

[0016] Figure 4 It is the positive pole tab installation schematic view of the utility model discloses a kind of positive pole nickel conversion area hides main body's button type electric core.

[0017] In the drawing: 1-core;2-positive pole tab;21-nickel tab;22-aluminum tab;23-nickel conversion area;24-tab rubber;3-negative pole tab;4-electric core aluminum plastic film shell;41-edge. DETAILED DESCRIPTION

[0018] To achieve the above-mentioned purpose and effect, the utility model adopts technical means and structure, and the characteristics and functions of the preferred embodiments of the utility model are described in detail in combination with the drawings.

[0019] As shown in the accompanying Figures 1-4 The utility model discloses a kind of positive pole nickel conversion area hides main body's button type electric core, including core 1, positive pole tab 2 and negative pole tab 3, core 1 is set in electric core aluminum plastic film shell 4, the outside of electric core aluminum plastic film shell 4 is provided with edge 41, skirt fluting structure is provided on edge 41, there is a certain gap between edge 41 and electric core aluminum plastic film shell 4, positive pole tab 2 and negative pole tab 3 are all connected with core 1 by the gap.

[0020] The positive tab 2 comprises an aluminum tab 21 and a nickel tab 22, one end of the aluminum tab 21 and the nickel tab 22 partially overlaps and is connected by laser welding to form a nickel transition area 23, and the welding points are arranged vertically along the width direction of the nickel transition area 23 during welding; the nickel transition area 23 is located in the empty area between the aluminum-plastic film packaging area on the aluminum-plastic film shell 4 and the winding core 1, which ensures that the nickel transition area 23 does not affect the aluminum-plastic film packaging and the welding of the positive tab 2, hides the nickel transition area 23 in the main body of the battery, avoids the nickel transition area 23 from being bent to cause the tab to break, and avoids the need for the nickel transition area 23 to avoid the bending position to affect the size of the battery; the nickel transition area 23 is covered with a tab rubber 24, the tab rubber 24 completely seals the nickel transition area 23, avoids the nickel transition area 23 from being broken, ensures that the electrolyte cannot enter the nickel transition area 23 and the nickel tab 22, and can effectively control the exposed length of the tab rubber 24, so that the exposed length of the tab rubber 24 is not affected by the position of the nickel transition area 23, and at the same time, the tab folding position of the winding core 1 can be positioned according to the position of the tab rubber 24, the bending position is more accurate, the exposed length tolerance of the tab rubber 24 can be controlled to be smaller, and the problem of difficult control of the exposed length of the tab rubber 24 is further solved.

[0021] The above only describes the preferred embodiments of the present application, not all embodiments, and anyone should know that any structural changes made under the inspiration of the present application, any technical solutions similar to or similar to the present application, all belong to the protection scope of the present application.

Claims

1. A button top cell having a positive electrode transition nickel zone housed within a body, characterized by, The application relates to a battery cell, which comprises a winding core (1), a positive electrode tab (2) and a negative electrode tab (3), the positive electrode tab (2) and the negative electrode tab (3) are located at the side edges of the winding core (1) and connected with the winding core (1), the positive electrode tab (2) comprises an aluminum tab (21) and a nickel tab (22), one end of the aluminum tab (21) and the nickel tab (22) is partially coincidently welded, the welded part is a nickel transition area (23), and the nickel transition area (23) is covered with tab rubber (24).

2. A button top battery cell of positive electrode transition nickel zone hiding in the main body, according to claim 1, characterized in that, The battery cell further comprises an aluminum-plastic film outer shell (4) of the battery cell, the winding core (1) is arranged in the aluminum-plastic film outer shell (4) of the battery cell, and the positive electrode tab (2) and the negative electrode tab (3) are connected with the winding core (1) through the aluminum-plastic film outer shell (4) of the battery cell.

3. A button top battery cell of claim 2, wherein, The outer side of the aluminum-plastic film outer shell (4) of the battery cell is provided with an edge sealing part (41), the edge sealing part (41) is provided with a pleated edge sealing part and closely contacts the side edge body of the aluminum-plastic film outer shell (4) of the battery cell, so as to form a pleated skirt shape, the positive electrode tab (2) and the negative electrode tab (3) are extended from the edge sealing part (41), and the nickel transition area (23) is located between the winding core (1) and the lower packaging area of the aluminum-plastic film outer shell (4) of the battery cell.

4. A button top cell as claimed in claim 1, wherein, The aluminum tab (21) and the nickel tab (22) are connected through laser welding.

5. A button top battery cell of the positive electrode rotating nickel zone hiding type as claimed in claim 4, characterized in that, The welding points of the laser welding are vertically arranged along the width direction of the nickel transition area (23).

Images