JPH0334189B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method of manufacturing a battery with a lead body that is directly attached to a printed circuit board as a backup power source for an electronic circuit such as an IC memory.

<Prior Art> Batteries with lead bodies as described above are becoming widely used due to the increasing demand for various electronic devices. This type of battery with a lead body is required to operate stably for a long period of time, so lithium batteries are often used because they have features such as a wide operating temperature range, high energy output, and excellent storage characteristics. Lead bodies are often fixed and connected to the positive and negative terminals of a coin-shaped or cylindrical battery by spot welding or the like, and the lead bodies are soldered directly to a printed circuit board.
As the lead body, a linear or plate-shaped body made of nickel or tin plated steel, nickel, stainless steel, etc. is used.

By the way, when connecting a linear lead body to a battery terminal, in order to improve spot welding workability and ensure welding strength, first one end of the metal wire 9, such as a nickel wire, is molded into a resin as shown in Fig. 3A. This plate-like part 9b is brought into contact with the terminal surface of the battery and spot-welded. In particular, in the case of a battery with a lead body using a coin type battery, the metal wire 9
are often bent and used before spot welding to batteries or after spot welding and before attaching to printed circuit boards. The bending point is at the boundary between the shaft portion 9a and the plate-like portion 9b of the metal wire 9 as shown in FIG. 3B, at the position on the shaft portion 9a side as shown in FIG. 3C, or at the position on the shaft portion 9a side as shown in FIG. 3D. Generally, the position is on the side of the plate-shaped portion 9b, as shown in FIG.

<Problems to be Solved by the Invention> However, when using the metal wire by bending the position as described above, the bending work is difficult because the metal wire is bent at the shaft part, the R is uneven, it is difficult to form a right angle, and the plate There is a drawback that the battery is lifted off the printed circuit board by the difference in thickness between the shaped part and the shaft part, making the support unstable. In addition, if it is bent in position, the wide plate-like portion cannot be fully inserted into the hole in the board when it is mounted on a printed circuit board, and it floats out of the hole in the board, resulting in unstable support. For this reason, a method is often used in which the metal wire is bent at a position where there are fewer defects, but due to work hardening caused by forming, the plate-like part becomes vulnerable to repeated bending, and the bending process of the metal wire is repeated several times. There is a problem that it may break during operation, or if it breaks at the bent part due to vibration etc. after being attached to the printed circuit board.

<Means for Solving the Problems> In the method of manufacturing a battery with a lead body of the present invention, a plate-shaped portion is formed at one end of a metal wire to form a lead body, and the plate-shaped portion is annealed to form a bit-shaped battery. The gist is to weld the plate-shaped portion to the battery terminal after the hardness is set to 100 to 160.

If the Vickers hardness Hv of the plate-like part of the lead body is less than 100, the plate-like part lacks hardness and becomes easily bent, resulting in a significant decrease in workability when inserting the lead body into a printed circuit board or the like. On the other hand, Pickers hardness
If Hv is greater than 160, it will break after being bent, for example, about four times, and the repeated bending resistance required in practice will not be satisfied.

In addition, when a nickel wire is used as the metal wire, it is preferable that the thickness of the plate-like part of the lead body is 0.05 to 0.3 mm; if it is thinner than 0.05 mm, there is a problem in practical strength regardless of the Vickers hardness. If it is thicker than 0.3mm, it will be difficult to spot weld.
The variation in weld strength increases.

<Function> By applying the above annealing treatment,
The repeated bending resistance of the plate-like part of the lead body is improved.

<Embodiment> In the embodiment shown in FIG. 1A, nickel wires 5 and 6 are used as leads for a coin-type battery.
In the embodiment shown in FIG. 1B, nickel wires 7 and 8 are spot-welded to the terminal plate 3 and battery can 4 of a cylindrical battery, respectively.

After the nickel wires 5 to 8 are cut to a predetermined size, one end of the nickel wires 5 to 8 is placed in a press jig 1 as shown in FIG.
0.11 to form a plate-shaped part, and after the molding, the plate-shaped part was annealed at 600 to 700°C. The plate-like part had a Vickers hardness Hv of 210 to 240 during press molding, and an Hv of 130 to 150 after annealing. If the plate-shaped part was only press-formed and not annealed, the plate-shaped part would break after being bent three times, but if it was annealed, it would break after being bent six times. It was confirmed that the annealing treatment improved the repeated bending resistance of the plate-shaped portion.

<Effects of the Invention> As described above, the method for manufacturing a battery with a lead body according to the present invention involves annealing a plate-shaped portion formed at one end of a metal wire serving as a lead body to a Vickers hardness of 100 to 160 after molding. The annealing process improves the repeated bending resistance of the plate-like part of the lead body, and the improved repeated bending resistance improves the workability during mounting on printed circuit boards. This has the effect that the degree of subsequent breakage due to vibration or the like is significantly reduced, and reliability can be improved accordingly.

[Brief explanation of drawings]

1A and 1B are perspective views showing an embodiment of the present invention, FIG. 2 is a cross-sectional view showing a part of the process of forming one end of a nickel wire into a plate-shaped portion, and FIGS. 3A to 3D are metal It is an explanatory view showing a method of bending a line. 1, 3... Terminal board, 2, 4... Battery can, 5-8... Nickel wire, 5a, 7a... Shaft part, 5b, 7b, 9b
...lamina.

Claims (1)

[Claims] 1. A lead body is formed by molding plate-like parts 5b, 7b on one end of the metal wires 5-8, and the plate-like parts 5b, 7b are annealed to have a Vickers hardness of 100-160. A method for manufacturing a battery with a lead body, characterized in that: after that, the plate-shaped portions 5b, 7b are welded to battery terminals. 2. The manufacturing method according to claim 1, wherein the metal wires 5 to 8 are nickel wires. 3 The thickness of the plate-shaped portions 5b and 7b is 0.05 to 0.3 mm.
The manufacturing method according to claim 2, characterized in that: