JPH0644028Y2 - Battery for board mounting - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a battery for mounting on a substrate, which is formed by fixing one end of a lead terminal for extracting current to the positive and negative terminal surfaces of the battery, and particularly to a thin battery. The present invention relates to a battery suitable for mounting on a printed circuit board of a shaped device.

<Prior Art> This type of board mounting battery, which is used as a backup power source for various electronic devices, has a nickel-plated battery with a thickness of about 0.2 mm on the terminal surface of a battery such as a flat battery or a cylindrical battery. It is made by directly fixing one end of a lead terminal made of plated metal (stainless steel, iron) plate, nickel plate, or nickel wire by laser welding or resistance welding, and the other end of the lead terminal is a printed circuit board. Be soldered directly to.

By the way, recently, along with the thinning of various devices, it is necessary to thin the printed circuit boards housed in the thin devices.
When mounting a board mounting battery on such a thin printed circuit board, conventionally, for example, as shown in FIG.
A strip-shaped lead plate 8 is fixed to the negative electrode terminal surface of the flat battery 1, and a lead plate 9 is formed on the positive electrode terminal surface by bending so that the other end thereof is substantially flush with the lead plate 8. A structure is adopted in which the other end of each of the lead plates 8 and 9 is soldered and mounted on the surface of the printed board 10 using the following board mounting battery. Further, as shown in FIG. 3 (B), the other ends of the lead plates 13 and 14 for taking out the batteries, whose other ends are bent in the same direction, are inserted into the terminal holes formed in the printed circuit board 15 and soldered. The structure of doing is also used.
In the figure, 11, 12 and 16, 17 are solders.

<Problems to be Solved by the Invention> However, in the case of surface mounting as shown in FIG. 3 (A), the bent terminal portion at the other end of the lead plate 9 may be caused by variations in the battery height of the flat battery 1. It is difficult to always closely contact the substrate with the surface of the substrate well, and the poor adhesion between the bent terminal portion and the substrate is likely to occur, and in extreme cases, these may float up from the substrate to make soldering impossible.

On the other hand, in the case of the type that is inserted into the board terminal hole, the printed circuit board becomes thicker by the soldering height of the other end of the lead terminal that protrudes to the lower surface side of the board, so there is a limit to making the board thinner with this type. , The applicable models are limited.

<Means for Solving the Problems> The board mounting battery of the present invention comprises a flat type battery in which one end of a lead terminal for current extraction is fixed to the positive electrode terminal surface and the negative electrode terminal surface, respectively. In a battery for mounting a board, the other end of each of the lead terminals is mounted on the surface of the printed board by soldering with the positive terminal surface or the negative terminal surface of the lead terminal facing the printed board. One has a Vickers hardness of 180 or less and a plate thickness of
The gist is that it can be bent freely within 0.15 mm.

If the thickness of the lead plate is 0.15 mm or more, even if the Vickers hardness is 180 or less, there is little freedom in deforming the lead terminals, and there are many restrictions in the thickness direction. This is because if it is 0.15 mm or less, it will be suitable for these applications.

Further, when the Vickers hardness H _V of the lead plate is 180 or more, the elasticity of the lead plate still remains considerably. Therefore, even if the lead plate is fitted to the substrate, the lead plate tends to float. On the other hand, if the Vickers hardness H _V is 180 or less, the lead terminals can be easily fitted to the substrate by plastic deformation, especially when the thickness is 0.15 mm or less.

If the Vickers hardness H _V is 180 or less in this way, even if the lead terminal has a spring property, for example, by lengthening the lead terminal or thinning the lead terminal depending on the shape, the lead terminal of the present invention can be obtained. Can be used as.

Further, the thin lead terminal used in the present application is preferably made of a material having a relatively large electric resistance such as nickel, stainless steel, or iron. This is because it is difficult to resistance-weld the lead terminal to the battery terminal surface when this type of lead terminal is made of a material having relatively low electric resistance such as copper or brass used for terminals of electronic parts.

<Operation> When the board is mounted using the above means, by adopting a method of bending the thin lead plate and soldering the board onto the board, for example, there is no problem described above and it is suitable for a thin printed board. A board mounting battery can be obtained.

<Example> In FIG. 1, a strip-shaped nickel lead plate 2 having a thickness of 0.2 mm is formed on a negative electrode terminal surface 1a of a flat type battery 1 such as a flat type lithium battery, and a thickness is formed on a positive electrode terminal surface 1b. Thin nickel lead plates 3 having a thickness of 0.1 mm are welded by spot welding such as laser welding and resistance welding (the arrow in the figure indicates the position of the welding point).

When mounting the above-mentioned board mounting battery on a board, first, as shown in FIG. 2, for example, the lead plate 2 is directed toward the board facing side (that is, the negative electrode terminal surface 1a is opposed to the printed board 6), First, the lead plate 2 is mounted on the substrate surface by soldering or the like, and at the same time as or after this, the other end portion of the lead plate 3 is pressed downward to be bent, and the other end portion is brought into contact with the substrate surface. In this state, the other end of the lead plate is similarly mounted on the substrate surface by soldering or the like.

<Effect of device> According to the device configured as described above, there is no trouble that the lead plate is lifted from the substrate, and the flat battery is surface-mounted on the printed circuit board. Further, since the plate thickness and Vickers hardness of the lead terminal are specified, it is possible to provide a board mounting battery that has good board mounting properties and can be used for ideal mounting.

[Brief description of drawings]

FIG. 1 is an explanatory view of a board mounting battery of an embodiment, FIG. 2 is an explanatory view of the battery mounted on a printed board, and FIGS. 3 (A) and 3 (B) are conventional board mounting batteries. It is explanatory drawing of the state which mounted on the printed circuit board. 1-flat battery, 2,3,8,9,13,14-lead plate, 4,7,1
5 …… Printed circuit board.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Tomohisa Nozue 5 36-11 Shimbashi, Minato-ku, Tokyo Fuji Electric Chemical Co., Ltd. (72) Hidetetsu Nagura 5 36-11 Shimbashi, Minato-ku, Tokyo Fuji Electrochemical Co., Ltd. (56) Reference JP-A-61-179062 (JP, A) JP-A-60-140650 (JP, A)

Claims (2)

[Scope of utility model registration request] 1. A flat battery having positive electrode terminal surfaces and negative electrode terminal surfaces each having one end portion of a lead terminal for current extraction fixed thereto, and the flat battery positive electrode terminal surface or negative electrode terminal surface facing a printed circuit board. In a board mounting battery in which the other end of each lead terminal is mounted by soldering on the surface of the printed circuit board in such a state, one of these lead terminals has a Vickers hardness of 18 or less.
A board mounting battery characterized in that it is bendable with a plate thickness of 0 or less and 0.15 mm or less. 2. The battery for mounting on a substrate according to claim 1, wherein the base body of the lead terminal is nickel, stainless steel, or iron.