External welding process method

Abstract

The invention relates to the technical field of welding processes, and discloses an external welding process method.The external welding process comprises a metal shell and a first conductor, a second conductor is placed at the lower end of the first conductor, and a first welding pin and a second welding pin are installed on the two sides of the upper end of the first conductor in a contact mode; the first welding pin and the second welding pin are externally connected to a welding device, and the welding process specifically comprises the following operation steps that S1, the first conductor and the second conductor are placed in a welding area, and meanwhile, the areas, needing to be welded, of the first conductor and the second conductor are tightly attached together in a plane or curved surface mode. According to the external welding process method, the welding function of the thin electric conductor and the metal shell can be realized through external welding of the thin electric conductor, so that the occupied space of the internal structure of the button battery is greatly reduced, the button battery has the advantage of high energy density, the production process of the battery is simplified, and the production cost of the battery is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of welding technology, in particular to an external welding technology method. Background Art

[0002] Welding is an industrial process that involves manufacturing processes and technologies for joining metals or other thermoplastic materials such as plastics by heating, high temperature or high pressure. The selection and implementation of welding processes depends on the material, grade, chemical composition, weldment structure type and welding performance requirements of the workpieces to be welded.

[0003] In the button battery processing, the internal cell of the steel shell polymer lithium ion button battery is stacked or wound. No matter which form it is, there is a process of welding the positive and negative electrodes to the shell. The positive and negative electrodes need to be welded to the shell with the help of a larger conductor. The traditional welding method is cumbersome to operate, occupies the longitudinal thickness space, reduces the mass energy density, and greatly limits the capacity of the battery design. The spatial structure is also subject to certain restrictions, which is very unfavorable for companies to compete for high capacity and high density energy. So far, we have proposed an external welding process method. Summary of the invention

[0004] In view of the shortcomings of the existing external welding process method, the present invention provides an external welding process method, which has the welding function of the outer shell, sets the welding point on the inner side of the welding point, simplifies the production process of the battery, reduces the production cost of the battery, and solves the problems raised in the above background technology.

[0005] The present invention provides the following technical solution: an external welding process method, comprising a metal shell and a first conductor, a second conductor is placed at the lower end of the first conductor, a first welding pin and a second welding pin are contact-mounted on both sides of the upper end of the first conductor, and the first welding pin and the second welding pin are externally connected to a welding device;

[0006] The welding process method specifically adopts the following operating steps:

[0007] S1. placing the first conductor and the second conductor in a welding area, and simultaneously the welding areas required for the first conductor and the second conductor are closely attached together in a plane or curved manner;

[0008] S2: contacting the lower ends of the first welding needle and the second welding needle with the upper end of the first conductor, and controlling the first welding needle and the second welding needle to be on the welding area;

[0009] S3: The welding device supplies power to the first welding needle and the second welding needle, and the first welding needle and the second welding needle correspond to the positive electrode and the negative electrode respectively. The welding device is provided with a power supply to supply power to the first conductor and the second conductor. The current generated by the power supply flows back and forth between the first conductor and the second conductor through the first welding needle and the second welding needle. The parts of the first conductor and the second conductor that are in close contact are heated to form a molten state.

[0010] S4: The staff separates the first welding needle and the second welding needle on the surface of the first conductor, stops supplying power between the first conductor and the second conductor and at different melting positions, causing the melting position to stop emitting heat, and at the same time, spontaneously dissipates heat until melting to form a weld nugget.

[0011] Preferably, the occurrence of the welding heat effect of the first welding needle and the second welding needle and the factors affecting the heat generation The heat generated during spot welding is determined by the following formula: Q = I 2 Rt.

[0012] Preferably, the power supply of the welding equipment is AC, AC inverter or transistor, and the first welding needle and the second welding needle are made of steel, copper, aluminum or nickel.

[0013] A button battery using an external welding process method, wherein a battery core is installed inside the metal shell, the battery core includes a conductor and an electrolytic layer, a coating layer is installed in layers inside the conductor, a coating layer is installed inside the coating layer, and the electrolytic layer is arranged at the lower end of the coating layer.

[0014] Preferably, the conductor is clamped and installed between the metal shell and the coating layer, and the electrolytic layer is arranged between the coating layer and the coating layer.

[0015] Preferably, the conductor is fitted on the inner wall of the metal shell, the first welding needle and the second welding needle are in contact with the outside of the metal shell, and a welding core is formed between the metal shell and the conductor.

[0016] Preferably, the metal shell is a steel component, and the conductor is made of steel, copper, aluminum or nickel, and is preferably a copper or aluminum component.

[0017] Compared with the existing external welding process, the present invention has the following beneficial effects:

[0018] 1. This external welding process method can achieve the welding function with the metal shell by welding a thin conductor from the outside. Therefore, the internal structure of the button battery occupies a greatly reduced space, has the advantage of high energy density, simplifies the battery production process, and reduces the battery production cost.

[0019] 2. This external welding process method is to place the first conductor and the second conductor on top of each other, and then use the first welding needle and the second welding needle to simultaneously install them on the outside of the first conductor, and form a loop through the first welding needle and the second welding needle to generate heat, specifically Q = I 2 Rt can drive the first conductor and the second conductor to form a welding core inside, and can form welding spots on the inside of the first conductor and the second conductor, thereby improving welding efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the external welding method of the present invention;

[0021] Figure 2 This is a schematic diagram of the main structure of the button battery of the present invention;

[0022] Figure 3 It is a schematic diagram of the cross-sectional structure of the button battery of the present invention.

[0023] In the figure: 1, metal shell; 2, battery core; 21, conductor; 22, electrolytic layer; 3, first conductor; 4, second conductor; 5, first welding needle; 6, second welding needle; 7, welding core; 8, coating layer; 9, current-carrying plate. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] See also Figure 1 , Figure 2 and Figure 3 An external welding process method includes a metal shell 1 and a first conductor 3, a second conductor 4 is placed at the lower end of the first conductor 3, a first welding pin 5 and a second welding pin 6 are installed on both sides of the upper end of the first conductor 3, and the first welding pin 5 and the second welding pin 6 are externally connected to the welding equipment;

[0026] The welding process method specifically adopts the following operating steps:

[0027] S1, placing the first conductor 3 and the second conductor 4 in the welding area, and simultaneously the welding areas required for the first conductor 3 and the second conductor 4 are closely attached together in a plane or curved manner;

[0028] S2: The lower ends of the first welding needle 5 and the second welding needle 6 are brought into contact with the upper end of the first conductor 3, and the first welding needle 5 and the second welding needle 6 are controlled to be on the welding area;

[0029] S3: The welding device supplies power to the first welding needle 5 and the second welding needle 6, and the first welding needle 5 and the second welding needle 6 correspond to the positive electrode and the negative electrode respectively. The welding device is provided with a power supply to supply power to the first conductor 3 and the second conductor 4. The current generated by the power supply flows back and forth between the first conductor 3 and the second conductor 4 through the first welding needle 5 and the second welding needle 6, and the parts of the first conductor 3 and the second conductor 4 that are in close contact are heated to form a molten state;

[0030] S4: The staff separates the first welding needle 5 and the second welding needle 6 on the surface of the first conductor 3, stops supplying power between the first conductor 3 and the second conductor 4 and at different melting positions, causing the melting position to stop emitting heat, and at the same time, spontaneously dissipates heat until melting to form a welding nugget 7.

[0031] See also Figure 1 The occurrence of the welding heat effect of the first welding needle 5 and the second welding needle 6 and the factors affecting the heat generation The heat generated during spot welding is determined by the following formula: Q = I 2 Rt, after the first welding needle 5 and the second welding needle 6 are in contact with the outside of the first conductor 3, that is, the first welding needle 5 and the second welding needle 6 generate heat, the heat can be used to control the contact area of ​​the first conductor 3 and the second conductor 4 to be hot-melt treated, and a weld core 7 is formed after the hot melt is cooled, which can drive the equipment to perform welding and fixing.

[0032] See also Figure 1 The power supply of the welding equipment is AC, AC inverter or transistor, and the material of the first welding needle 5 and the second welding needle 6 is steel, copper, aluminum or nickel.

[0033] A button battery using an external welding process method, wherein a battery cell 2 is installed inside a metal shell 1, the battery cell 2 includes a conductor 21 and an electrolytic layer 22, a coating layer 8 is installed in layers inside the conductor 21, a coating layer 9 is installed inside the coating layer 8, the electrolytic layer 22 is arranged at the lower end of the coating layer 9, and the coating layer 8 is sleeved on the inner sides of the coating layer 9 and the electrolytic layer 22, the coating layer 8 plays a protective role, the coating layer 9 supplies power to the battery, and the electrolytic layer 22 is arranged on the inner sides of two groups of coating layers 9, and the electrolytic layer 22 can drive the current for guidance.

[0034] See also Figure 3 The conductor 21 is clamped and installed between the metal shell 1 and the coating 8, the electrolytic layer 22 is arranged between the coating 8 and the coating 9, and the conductor 21 is arranged on the inner side of the metal shell 1. At the same time, the conductor 21 and the metal shell 1 respectively guide the current, that is, the positive and negative electrodes are formed outside the battery.

[0035] See also Figure 3The conductor 21 is fitted on the inner wall of the metal shell 1, the first welding needle 5 and the second welding needle 6 are in contact with the outside of the metal shell 1, and a welding core 7 is formed between the metal shell 1 and the conductor 21. The conductor 21 is installed on the inner wall of the metal shell 1, and the first welding needle 5 and the second welding needle 6 are controlled to be fitted on the outside of the metal shell 1. After the first welding needle 5 and the second welding needle 6 are energized to form a reflow, they are welded at the connection between the metal shell 1 and the conductor 21, and the welding core 7 is arranged on the inner wall of the metal shell 1. At this point, the battery cell inside the button battery only needs to be welded from the outside by a thin conductor to realize its welding function with the metal shell. Therefore, the internal structure of the button battery occupies a greatly reduced space, has the advantage of high energy density, simplifies the production process of the battery, and reduces the production cost of the battery.

[0036] See also Figure 3 The metal shell 1 is a steel component, and the conductor 21 is made of steel, copper, aluminum or nickel, and is preferably a copper or aluminum component.

[0037] Working principle: Example 1:

[0038] An external welding method, the areas where the first conductor 3 and the second conductor 4 need to be welded are closely attached to each other in the form of a plane or a curved surface; a first welding needle 5 and a second welding needle 6, both of which are conductive, are respectively used to contact the end faces of the welding areas of the first conductor 3; the first welding needle 5 is used as the positive electrode or the negative electrode, and the second welding needle 6 is used as the corresponding negative electrode or the positive electrode, the power supply is started, and the current flows back and forth between the first conductor 3 and the second conductor 4, and the parts of the second conductor 4 that are in close contact with the first conductor 3 and the parts of the first conductor 3 that are in close contact with the second conductor 4 are heated to form a molten state; the first welding needle and the second welding needle are respectively separated from the first conductor, and the parts between the first conductor 3 and the second conductor 4 that are in a molten state form a weld nugget 7 due to spontaneous heat dissipation.

[0039] Embodiment 2: The battery cell 2 is arranged inside the metal shell 1, and the coating layer 8 and the coating layer 9 are sequentially stacked inside the battery cell 2, the conductor 21 is controlled to be installed on the inner side of the metal shell 1, and the first welding needle 5 and the second welding needle 6 are controlled to contact the outer wall of the metal shell 1, and the first welding needle 5 and the second welding needle 6 are controlled to be installed on the outside of the metal shell 1, and the power supply is powered, and the power supply drives the metal shell 1 and the conductor 21 to form a power circuit, that is, a welding core 7 is formed between the metal shell 1 and the conductor 21, and the welding of the equipment is completed, so that the battery cell inside the button battery can be welded to the metal shell by welding from the outside through a thin conductor. Therefore, the space occupied by the internal structure of the button battery is greatly reduced, and it has the advantages of high energy density, simplifies the production process of the battery, and reduces the production cost of the battery.

[0040] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An external welding process method, characterized in that: It comprises a metal shell (1) and a first conductor (3), wherein a second conductor (4) is placed at the lower end of the first conductor (3), and a first welding pin (5) and a second welding pin (6) are installed on both sides of the upper end of the first conductor (3) in contact with each other, and the first welding pin (5) and the second welding pin (6) are externally connected to a welding device; The welding process method specifically adopts the following operating steps: S1, placing the first conductor (3) and the second conductor (4) in a welding area, and simultaneously the welding areas required for the first conductor (3) and the second conductor (4) are closely attached together in a plane or curved manner; S2: contacting the lower ends of the first welding needle (5) and the second welding needle (6) with the upper end of the first conductor (3), and controlling the first welding needle (5) and the second welding needle (6) to be on the welding area; S3: The welding device supplies power to the first welding needle (5) and the second welding needle (6), and the first welding needle (5) and the second welding needle (6) correspond to the positive electrode and the negative electrode respectively. The welding device is started and a power source is provided to supply power to the first conductor (3) and the second conductor (4). The current generated by the power supply flows back and forth between the first conductor (3) and the second conductor (4) through the first welding needle (5) and the second welding needle (6), and the parts of the first conductor (3) and the second conductor (4) that are in close contact are heated to form a molten state; S4: The staff separates the first welding needle (5) and the second welding needle (6) on the surface of the first conductor (3), stops supplying power between the first conductor (3) and the second conductor (4) and at different melting positions, causing the melting position to stop emitting heat, and at the same time, spontaneously dissipates heat until melting to form a welding nugget (7).

2. An external welding process according to claim 1, characterized in that: The occurrence of the welding heat effect of the first welding needle (5) and the second welding needle (6) and the factors affecting the heat generation The heat generated during spot welding is determined by the following formula: Q = I 2 Rt.

3. An external welding process according to claim 1, characterized in that: The power source of the welding equipment is an alternating current, an alternating current inverter or a transistor type, and the first welding needle (5) and the second welding needle (6) are made of steel, copper, aluminum or nickel.

4. A button battery using an external welding process according to any one of claims 1 to 3, characterized in that: A battery cell (2) is installed inside the metal shell (1), the battery cell (2) comprises a conductor (21) and an electrolytic layer (22), a coating layer (8) is installed in layers inside the conductor (21), a coating layer (9) is installed inside the coating layer (8), and the electrolytic layer (22) is arranged at the lower end of the coating layer (9).

5. A button battery using an external welding process according to claim 4, characterized in that: The conductor (21) is clamped and installed between the metal shell (1) and the coating layer (8), and the electrolytic layer (22) is arranged between the coating layer (8) and the coating layer (9).

6. A button cell battery using an external welding process according to claim 4, characterized in that: The conductor (21) is fitted on the inner wall of the metal shell (1), the first welding needle (5) and the second welding needle (6) are in contact with the outside of the metal shell (1), and a welding core (7) is formed between the metal shell (1) and the conductor (21).

7. A button cell battery using an external welding process according to claim 4, characterized in that: The metal shell (1) is a steel component, and the conductor (21) is made of steel, copper, aluminum or nickel.

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