Automatic connection method for electrode slice lead of secondary battery

Abstract

The present invention relates to a method for automatically connecting an electrode tab lead of a secondary battery, in which when the electrode tab lead is used up and connected to a new electrode tab lead on the secondary battery, a hole is punched in a state in which the existing electrode tab lead is connected to the new electrode tab lead, and the electrode tab lead is automatically connected by pressing up and down with a pressing tool. According to the invention, a used electrode slice and a new electrode slice are connected, a supporting mold with holes is positioned at the bottom, a punching tool is moved from top to bottom and punches the plurality of electrode slices, two tail ends of the lower part of each electrode slice are bent towards the bottom surface and extend outwards, then the punching tool is moved upwards, and the electrode slices are punched by the punching tool. In a state in which two circular holes are formed in the electrode slice connecting part, the electrode slice is pressed by a square pressing tool which moves from top to bottom through a cylinder or the like, so that the tail end of the electrode slice which extends outwards is completely adhered to the electrode slice, and the electrode slice connecting part is integrated, so that the electrode slice can be continuously used.

Description

Technical Field

[0001] The present invention relates to an automatic connection method for electrode sheet leads of a secondary battery. Specifically, in the process of connecting electrode sheets on a secondary battery, when the electrode sheet leads are connected to new electrode sheet leads after use, two connection positions are punched with holes while the existing electrode sheet leads are connected to the new electrode sheet leads, and then they are pressed up and down with a pressing tool to automatically connect the electrode sheet leads. Background Art

[0002] Generally speaking, batteries are devices that convert chemical energy into electrical energy through electrochemical reactions. They are generally divided into primary batteries and secondary batteries. Among rechargeable and dischargeable secondary batteries, lithium secondary batteries with high voltage and high energy density are currently the most popular. Lithium secondary batteries are widely used in small batteries for information appliances such as mobile phones and laptops.

[0003] The conventional method for manufacturing lithium secondary batteries is to stack a negative electrode collector in the form of a gate, a negative electrode in the form of a matrix film, an isolation film in the form of a matrix film, a positive electrode in the form of a matrix film, and a positive electrode collector in the form of a gate in sequence, and then pass a laminator through the laminator to integrate the multiple elements and fold them into a zigzag shape to form a structure of the desired shape.

[0004] The existing lithium secondary battery manufactured by the above method is called a "continuous lithium secondary battery" because the electrodes are continuously connected. The electrodes are connected to each other, which has the advantage of simple electrode sheet processing. However, the electrodes may be damaged during the folding process.

[0005] In order to solve these problems, multiple negative plates and multiple positive plates are used in the past, and multiple negative plates and multiple positive plates are stacked alternately, so they are called "laminated lithium secondary batteries". This form of lithium secondary battery will not have the problem of electrode damage during the folding process.

[0006] However, for stacked lithium secondary batteries, it is necessary to effectively handle the electrode sheets located on multiple negative plates and multiple positive plates, and there are difficulties in connecting the electrode sheet leads.

[0007] Furthermore, in the past, electrode sheets are pasted on cylindrical secondary batteries for use. After the electrode sheets are used, the film must be cut with a cutter and the machine must be stopped to connect with a new electrode sheet before continued use. However, since the machine is too large, a welder cannot be used to connect the electrode sheets. Therefore, sometimes the connection is stapled with a stapler or glued with tape. However, the connection part is weak and is prone to breakage during use.

[0008] [Prior technical literature]

[0009] [Patent Literature]

[0010] Patent application number 10-2004-0082841;

[0011] Patent application number 10-2006-0076308;

[0012] Patent application number 10-2014-0103157. Summary of the invention

[0013] Technical issues

[0014] In order to solve the above-mentioned problems, the present invention provides an automatic connection method for electrode sheet leads of a secondary battery. According to the method, during the process of pasting electrode sheets on a cylindrical secondary battery, after all the electrode sheets are used up, they are cut with a cutter and connected to new electrode sheets. After the used electrode sheets are connected to the new electrode sheets and punched with a puncher, the electrode sheets are pressed with a pressing frame above and below so that the ends of the electrode sheets extending outward are completely in close contact with and connected to the electrode sheets.

[0015] Technical Solution

[0016] To achieve the above-mentioned purpose, the solution adopted by the present invention is that, preferably, a used electrode sheet and a new electrode sheet are connected together, a supporting mold with a hole is located at the bottom, and a punching tool is moved from top to bottom to perform punching. As a result, the electrode sheet is punched, and the two ends of the lower part of the electrode sheet are bent toward the bottom surface and extended outward. Then, the punching tool is moved upward, and the supporting mold on the bottom surface is also moved to the side. When a circular hole is formed on the electrode sheet, a square pressing tool that moves from top to bottom through a cylinder or the like presses the electrode sheet, so that the end of the electrode sheet extending outward is completely close to the electrode sheet, thereby becoming an integrated whole.

[0017] Preferably, the punching tool is formed in a cylindrical shape, and a lower bevel is sharply formed.

[0018] Beneficial Effects

[0019] The electrode sheet for secondary battery according to the present invention as described above has the beneficial effect that when a new electrode sheet lead is connected to a used electrode sheet lead, the used electrode sheet and the new electrode sheet are connected, and after a hole is punched with a puncher, a pressing tool is used to press from top to bottom to automatically connect the electrode sheet leads. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a perspective view of a cylindrical secondary battery of the present invention connected with an electrode sheet;

[0021] Figure 2 is a schematic diagram showing an electrode sheet of the present invention;

[0022] Figures 3 to 5is a schematic diagram showing the action of punching a hole with a puncher and returning to the original position in a state where the electrode sheet of the present invention is connected;

[0023] Figure 6 Yes Display Figure 5 Schematic diagram of the action of pressing with upper and lower pressing plates after punching a hole in the middle;

[0024] Figure 7 is a cross-sectional view of an electrode sheet in a state of being connected according to the present invention;

[0025] Figure 8 It is a plan view showing the connection state of the electrode sheet of the present invention.

[0026]

Explanation of symbols

[0027] 1: Cylindrical secondary battery; 2, 3: Electrode sheet;

[0028] 2a, 3a: two ends; 4: punching tool;

[0029] 5, 6: Pressing tools; 7: Supporting mold. DETAILED DESCRIPTION

[0030] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0031] Figure 1 is a perspective view of a cylindrical secondary battery of the present invention connected with an electrode sheet, Figure 2 is a schematic diagram showing an electrode sheet of the present invention, Figures 3 to 5 is a schematic diagram showing the action of punching a hole with a puncher and returning to the original position in a state where the electrode sheet of the present invention is connected, Figure 6 Yes Display Figure 5 Schematic diagram of the action of pressing with the upper and lower pressing plates after punching a hole in the middle. Figure 7 is a cross-sectional view of the electrode sheets in a state of being connected according to the present invention, Figure 8 It is a plan view showing the connection state of the electrode sheet of the present invention. As shown in the figure, the cylindrical secondary battery 1 of the present invention is that the electrode sheet is wound on a cylinder. This electrode sheet is generally formed of copper, aluminum, nickel, etc. and has a thickness of about 0.3 mm.

[0032] First, the present invention is as follows Figure 1 , 2As shown, after the electrode sheet 2 for the secondary battery is used up, it is necessary to hold the existing electrode sheet 2 and move the new electrode sheet 3 to contact it, so that the new electrode sheet 3 wound on the cylinder is connected to the existing electrode sheet 2. The present invention relates to a process for automatically connecting the used electrode sheet 2 with the new electrode sheet 3 to be connected. After the electrode sheets 2 and 3 are connected, the supporting mold 7 is placed on the bottom surface, and two punching tools 4 are moved from top to bottom to punch holes in the two connecting parts of the connected electrode sheets 2 and 3.

[0033] Here, the connection portion of the electrode sheets 2 and 3 is perforated at two locations in order to prevent the connection portion from moving and twisting.

[0034] Here, the punching tool 4 is formed in a cylindrical shape, and the lower portion is formed with a sharp bevel, so that it is easy to punch a hole in the connection portion between the electrode sheets 2 and 3.

[0035] After using this punching tool 4 to punch holes in the connecting portion of the electrode sheets 2 and 3, Figure 4 As shown, the electrode sheets 2 and 3 are punched, and then the two ends 2a and 3a of the lower part of the electrode sheets 2 and 3 are bent toward the bottom and then extended outward.

[0036] After the electrodes 2 and 3 connected to each other are punched and holes are formed, Figure 5 As shown, while the punching tool 4 moves upward again, the bottom supporting mold 7 also moves sideways.

[0037] And if Figure 6 As shown in FIG. 1 , in a state where two circular holes are formed on the electrode sheets 2 and 3, when the square pressing tools 5 and 6 that move up and down by the cylinder or the like press the electrode sheets 2 and 3, the ends of the electrode sheets 2 and 3 that extend outward are pressed by the pressing tools 5 and 6 and completely adhere to the electrode sheets 2 and 3, and then as shown in FIG. Figure 7 As shown, the electrode sheets 2 and 3 are integrated, so new electrode sheets 3 can continue to be used.

[0038] Here, the punching tool 4 and the pressing tools 5 and 6 are provided so as to be movable by a cylinder or the like.

[0039] Figure 8 The state in which the connection of the electrode sheets 2 and 3 is completed is shown on a plane, and a square is formed by the punching tool 4 and the pressing tools 5 and 6.

[0040] Through the process described above, the connection of the electrode sheets 2 and 3 becomes easy, and then the connection portion is cut and discarded, and the remaining clean electrode sheet portion without the connection portion will be further used.

[0041] The present invention as described above is not limited to the embodiments. Obviously, it is self-evident that ordinary technicians in the technical field to which the present invention belongs can effectively apply it through various embodiments, but it does not make the essence of the corresponding technical solution deviate from the scope of the technical solution described in each embodiment of the present invention.

Claims

1. An automatic electrode lead connection method, characterized in that: include: The first step is to connect the used electrode sheet with the new electrode sheet; In the second step, when the connecting sheets are connected, the supporting mold is placed on the bottom surface, and multiple punching tools are moved downward from the top to punch holes, thereby forming two circular holes at the connecting parts of the connected electrode sheets, and then the two ends of the lower part of the electrode sheets are bent toward the bottom surface and extended outward; The third step is to move the punching tool upward and the supporting mold on the bottom sideward after the second step; In the fourth step, after two circular holes are formed on the connecting portion of the electrode sheet, a pressing tool moved by a cylinder is used to press the electrode sheet up and down, so that the end of the electrode sheet extending outward is completely in close contact with the electrode sheet to form an integrated body.

2. The method for automatically connecting electrode leads of a secondary battery according to claim 1, characterized in that: The punching tool is formed in a cylindrical shape, and a lower bevel is sharply formed.

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