JPH0635368Y2 - Surface shape of battery pack - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a surface shape of the surface of a battery pack formed in a satin-like shape, and in particular, it prevents the partial disappearance of the satin-like area due to ultrasonic welding and is a good product. The present invention relates to a satin pattern shape that gives an appearance.

<< Prior Art >> A so-called battery pack in which a plurality of batteries are packed in a case and a predetermined voltage can be taken out for a long time is known. Among batteries of this type, in the case of a battery pack having a structure in which the cover and the opening edge of the case are welded via an ultrasonic horn when the opening surface of the bottomed cylindrical case is covered by the cover, Occurs on the product surface during molding. For the purpose of concealing "sinks", preventing a defective surface condition due to scratches, and improving the appearance, a product having a satin-shaped grain is formed on the surface of the product.

Compared with the battery formed on the glossy surface, the battery pack with such a grain on the surface gives a good appearance to the person who sees it and gives a high-grade impression. Alternatively, there is an advantage that the yield is not reduced due to minute scratches generated in the assembly process.

<Problems to be solved by the device> However, when observing the conventional grain, it has a saw-toothed microscopic shape, and its formation pitch is 10 μm or less, and the depth is at most about 5 μm. When welding the edge through the ultrasonic horn, the contact surface of the ultrasonic horn with the cover surface and the part of the bottom surface of the container that is pressed by the ultrasonic horn are crushed and become glossy in a mottled state. It wasn't looking good.

The present invention has been made in view of the above problems, and by devising the shape and size of the grain, it is possible to prevent the grain from being crushed into an irregular shape during ultrasonic welding and further improve the design appearance performance. It is an object of the present invention to provide a battery pack of the above.

<Means for Solving the Problems> In order to achieve the above object, the present invention comprises a bottomed cylindrical case that accommodates a plurality of batteries, and a cover that covers the opening of the cylindrical case. In a pack battery in which the battery is hermetically sealed by welding to the opening edge of the cylindrical case via an ultrasonic horn, the cross section of the convex portion of the satin pattern formed on the surface of the case and the cover is directed toward the surface side. Trapezoidal or sinusoidal waveform is repeatedly formed, and the width of each convex portion is set within the range of 50 μm to 150 μm.

<Operation> According to the above configuration, the surface between the cover and the case is pressed by the ultrasonic horn in a compressed state, and the surface in contact with the ultrasonic horn or the pedestal is crushed to some extent when the bonding portion is fused by ultrasonic vibration. However, since the flat state of the crushed portion is slightly larger than the area of the apex as compared with the saw-toothed pear-skin protrusion, the pear-skin shape is less damaged, and irregular gloss is less likely to occur.

<< Embodiment >> An embodiment of the present invention will be described below in detail with reference to the drawings.

In FIG. 1 and FIG. 2, the battery pack comprises a cylindrical case 1 made of a thermoplastic resin such as polycarbonate, polyphenylene oxide, ABS and the like, and a pair of cells housed in parallel in the case 1. Battery 2 and a cover 3 which is also made of a thermoplastic resin and covers the opening of the case.

An intermediate connection terminal 4 for connecting the positive and negative electrode terminal portions of each battery 2 in series is integrally provided on the inner surface of the cover 3.

Further, the case 1 forms a pair of battery accommodating portions 5 having a substantially concave cross section corresponding to the outer diameter shape of each battery 2. In addition, a pair of mounting holes 6 for mounting external connection terminals for connecting to the positive and negative electrodes of the battery 2 are provided in the center of the battery housing portion 5 on the bottom surface thereof.
To form an opening.

As shown in FIG. 3, satin-finished crevices 1a, 3a are formed on the entire surfaces of the case 1 and the cover 3 in accordance with the shape of the mold surface of the injection molding die.

The convex portion 20 forming each grain 1a, 3a is formed in a cross-sectional shape in which a rounded trapezoidal shape or a sinusoidal waveform is repeated continuously and a valley portion 21 becomes an acute angle and is cut at a depth of about 10 μm. The width of each recess 20 is set to 50 μm or more and 150 μm or less.

The size of this width is set to be larger than the conventional pitch for forming the satin-finished grain, and in appearance, the grain of the satin-finished grain is large, and the matte-finished grain is formed in a semi-gloss state.

In the above configuration, each battery 2 is housed in the case 1, the cover 3 is fitted into the upper opening of the case 1, and in that state, the bottom surface of the case 1 is ultrasonically welded as shown in FIG. It is installed on the pedestal 9, and the switch SW of the oscillator 12 is turned on with the cover 3 facing the pressing mold 11 provided at the tip of the ultrasonic horn 10, the horn 10 is lowered, and the mold 11 covers it. When 3 is pressed against the case, the joining portion of both is melted by ultrasonic vibration and is integrally joined.

At this time, the contact surface with the mold 11 is melted by ultrasonic heating,
The shape is crushed and flattened.

However, since the convex portion 20 forming the grain 3a has a trapezoidal shape or a sinusoidal shape, even if the top is crushed to some extent, the surface does not become a large area and the valley as shown in FIG. Since it is continuous with the part 21 and is in a semi-glossy state without being matte, this compressive force does not result in an irregularly shaped glossy part, and as a result, it does not remain after processing.

Similarly, the contact surface of the grain 1a with the pedestal 9 does not remain after processing.

In addition, when the formation pitch of the convex portions 20 is less than 50 μm, the crushed portion is conspicuous, and when it exceeds 150 μm, the grain as a grain becomes rough, so set it within 50 to 150 μm. The effect of can be obtained.

<Effects of the Invention> As described in detail with reference to the embodiments above, in the battery pack according to the present invention, compared to the conventional satin-finished shape, the portion crushed by ultrasonic welding does not completely flatten, Since it can maintain the satin shape, it does not cause irregular luster.

Therefore, in this invention, the design appearance is further improved and the appearance is improved.

[Brief description of drawings]

FIG. 1 is a perspective view of a battery pack according to the present invention, FIG. 2 is a perspective view of the battery pack seen from the bottom side, FIG. 3 is a partially enlarged sectional view of the surface portion of the battery pack, and FIG. FIG. 5 is an explanatory view showing a sonic processing state, and FIG. 5 is an enlarged cross-sectional view showing a collapsed state of the grain during the processing. 1 ... Case, 2 ... Battery 3 ... Cover, 1a, 3a ... Grain 10 ... Ultrasonic horn, 20 ... Convex part

Claims (1)

[Scope of utility model registration request] 1. A cylindrical case having a bottom for accommodating a plurality of batteries, and a cover for covering an opening of the cylindrical case, the cover being provided on an opening edge of the cylindrical case via an ultrasonic horn. In a battery pack in which the battery is hermetically sealed by welding, the cross section of the convex portion of the satin pattern formed on the surfaces of the case and the cover is formed in a shape in which a trapezoidal or sinusoidal waveform is repeated continuously toward the surface side, and The width of each protrusion is 50 μm to 15
A surface shape of a battery pack, which is set within a range of 0 μm.