JPH1140174A - Organic electrolyte battery equipped with terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the heat transfer quantity between a terminal and a power generating element at the time of installing a circuit board by forming one of a positive and a negative terminals as to cover the whole body of the power generating element, installing it so as to cover the whole body of the power generating element, and forming a gap in apart except a welding point between the terminal and the power generating element. SOLUTION: While keeping a gap 5 between a power generating element and both a terminal 3 which has a part 3c to be connected with a circuit and a part 3b for covering the power generating element 1 and a normal terminal 2, welding is carried out so that laser output is made controllable, and the heat conductivity is lowered due to the layer of air. It is preferable that the terminal 3 and the terminal 2 be provided with a projected part 3a formed in the part to cover the power generating element and a projected part 2a, respectively, in the parts to be welded with the power generating element 1. The cross-sectional area of the welded point 4 is small, and the heat transfer quantity is small. An insulating material such as a viscid material may be put partly in the gap 5. It is also preferable that aluminum having high infrared ray reflectivity be put in the surface of the part 3b for covering the power generating element 1 and that a humidity resistant synthetic resin is injected and solidified in the inside.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an organic electrolyte battery with terminals having high temperature resistance.

[0002]

2. Description of the Related Art An organic electrolyte battery with terminals is often mounted on a printed circuit board and used.
As shown in FIG. 1, in most cases, terminals are used with terminals welded to power generating elements. Some of them were molded with synthetic resin, but only the synthetic resin was used for the mold.

[0003]

The battery is heated by heat conduction from the molten solder at the end of the terminal and radiant heat transfer from the heater of the reflow furnace. The conventional organic electrolyte battery with terminals has low heat resistance, and has a problem in that when it is mounted on a printed circuit board and passed through a solder reflow furnace, it is deteriorated or destroyed. Therefore, after the other components are mounted on the printed circuit board and the solder reflow process is completed, only the battery is mounted. This is inconvenient because the cost for assembling the circuit board is high. There is also a type in which heat resistance is improved by a plastic mold. However, since infrared rays penetrate the plastic by 2 to 3 mm, a heat shielding effect is not exhibited unless the molded part is thickened. Therefore, a thick mold is attached to the heat shield, and there is a disadvantage that the battery becomes a very large part.

[0004]

In order to solve the above-mentioned problems, the present invention uses two types of terminals, a terminal 3 having a shape covering the entire power generating element and a terminal 2 generally used, as shown in FIG. Then, welding is performed with the gap 5 provided between the terminal and the power generating element. Welding of the terminal and the power generation element using the laser welding device in a state where the clearance is provided is possible by controlling the output. If the projections 3a and 2a are provided at portions where these terminals are welded to the power generating element, welding control is easy.
The welding point has a very small cross-sectional area and the amount of heat transferred through the welding point is small. The radiant heat transfer from the heater only heats the terminals, and it takes a long time to raise the temperature of the internal power generation element, during which time the solder reflow ends.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention uses a terminal 2 having a commonly used shape, a terminal 3b covering the entire power generating element, and a portion 3c for connecting to a circuit. Terminal used in the present invention
2 and 3 have small protrusions 2a at the welding part with the power generation element 1.
And 3a are provided. The terminal 3 having a portion 3b covering the entire power generating element can be formed by a forming machine or the like. Can also be manufactured. It is effective to arrange aluminum, nickel, stainless steel, copper, a copper alloy, or the like having a high reflectance to infrared rays on the surface of the portion 3b of the terminal 3 covering the power generation element.

Further, even if an insulator such as an adhesive 6 or urethane resin is interposed in a part between the terminals 2 and 3 and the power generating element 1, welding between the terminals 2 and 3 and the power generating element 1 is possible. However, an insulator can be inserted so that the terminals 2 and 3 do not short-circuit with the other pole. Further, when the moisture-resistant synthetic resin 6 is injected and solidified inside the portion 3b covering the power generating element, the moisture resistance is improved in addition to the heat resistance.

[0007]

An embodiment will be described with reference to the drawings. (Embodiment 1) FIG. 1 shows an embodiment of the present invention using a lithium ion battery, model MS621, as a power generating element. In the figure, a power generating element 1 was manufactured by a conventional manufacturing process using a positive electrode mixture, a negative electrode mixture, an electrolytic solution, a separator, a positive electrode can, a negative electrode can, and a gasket as main components. The lead terminal 2 and the lead terminal 3 having a portion covering the entire power generating element were welded to the lead terminal 2 using a laser welding device. The lead terminal 3 is a part that is manufactured by deep drawing the part 3b that covers the power generation element and is connected to the circuit.
3c was manufactured by molding with a press die, and these were attached by welding to complete. FIG. 1D is an enlarged view of the vicinity of the welding point 4 in the upper part of FIG. 1B, and FIG.
It is an enlarged view of the welding point 4 of the lower part of (b).

(Embodiment 2) FIG. 2 shows an embodiment of the present invention in which a lithium ion battery MS621 is used as a power generating element, which is the same as Embodiment 1, and a short circuit is prevented when the terminal 3 is welded to the power generating element 1. In addition, a double-sided tape is used as the adhesive material 6 for fixing the connection position of the terminal, and is welded in a partially insulated state. FIG. 2D is an enlarged view of the vicinity of the upper welding point 4 of FIG. 2B, and FIG. 2F is an enlarged view of the lower welding point 4 of FIG. 2B.

(Embodiment 3) FIG. 3 shows an embodiment in which an epoxy resin is injected and solidified in the embodiment of FIG. FIG. 3D shows FIG.
FIG. 3B is an enlarged view near the welding point 4 in the upper part of FIG.
(F) is an enlarged view of the welding point 4 in the lower part of FIG. 3 (b).

[0010]

As described above, in the organic electrolyte battery with the terminal configured as described above, infrared rays are reflected by the portion of the terminal covering the power generating element, and the heat transfer amount is suppressed to a small value. Further, an air layer or a plastic layer exists between the terminal and the power generation element main body, and since these layers have low thermal conductivity, heating of the power generation element is suppressed. Since the metallic contact between the terminal and the power generating element is only at the welding point and its cross-sectional area is small, the amount of heat transfer can be kept small.

The above Examples 1 to 4 and the conventional product were actually passed through a solder reflow furnace, and the deterioration and destruction of the quality of the battery were confirmed. Table 1 shows the results. The number in the table is the defective rate for each of 20 test batteries. The present invention
It is implemented in the form described above, and has an effect of imparting heat resistance that can be used in a solder reflow furnace to an organic electrolyte battery with terminals, as shown in the experimental results in Table 1.

[0012]

[Table 1]

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view showing another embodiment of the present invention.

FIG. 3 is a sectional view showing a third embodiment of the present invention.

FIG. 4 is a view showing a conventional battery.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Power generation element (battery) 2 Terminal 2a Protrusion provided on terminal 3 Terminal having part covering power generation element 3a Protrusion provided on part covering power generation element of terminal 3b Part covering power generation element 3c Part connected to circuit 4 Welding point 5 Clearance between terminal and power generation element 6 Adhesive 7 Synthetic resin

Claims (4)

[Claims] 1. A power generating element and a positive / negative terminal, wherein one of the terminals has a shape covering the entire power generating element, the terminal is positioned to cover the power generating element, and a clearance is provided between the terminal and the power generating element except for a welding point. An organic electrolyte battery with a terminal, characterized in that: 2. The terminal-equipped organic electrolyte battery according to claim 1, wherein the terminal has a projection at a welding portion between the terminal and the power generating element. 3. An insulator is interposed in a part of a clearance between the terminal and the power generating element except for a welding point.
An organic electrolyte battery with the terminal as described. 4. The terminal-equipped organic electrolyte battery according to claim 1, wherein a synthetic resin is injected and solidified inside the terminal also serving as a cover for the entire power generation element.