JPH0515722Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Industrial Application Field] The present invention relates to a battery storage case used for a battery pack, etc. More specifically, it is a two-piece case consisting of a pair of case halves, each of which has an arched outer surface connected to the opening edge. The present invention relates to a battery storage case whose opening edges are welded to each other with a battery stored therein. [Prior Art] Conventionally, as this type of battery storage case, there are those disclosed in, for example, Japanese Patent Publication No. 56-9789 and Japanese Patent Application Laid-open No. 164226/1982. The battery storage case disclosed in Japanese Patent Publication No. 56-9789 has a plurality of storage recesses, and one case half has upright side walls on both the left and right sides, and the other case half has upright side walls on both the front and back sides. A plurality of batteries are housed in the housing recess, and one half of the case and the other half of the case are butted and welded together with the side walls facing toward the opposing surface. In addition, the battery storage case disclosed in Japanese Patent Application Laid-Open No. 54-164226 has an outer surface that is made up of a plurality of arches that are interconnected by connecting base parts and extend in parallel at close intervals, and this outer surface is generally parallel to each other. A pair of case halves of substantially the same shape, each having an end surface extending across the outer surface and bridging together the arch on the outer surface or an extension of the arch, are brought into abutment with their opposing parts facing each other in a state in which a plurality of batteries are housed. It was welded together. [Problems to be solved by the invention] However, the battery storage case disclosed in the above-mentioned Japanese Patent Publication No. 54-9789 has problems because its side wall is provided upright with respect to the base of the case half. However, there were problems in that the volume space was larger than the number of batteries housed, and the overall shape became larger than necessary. In addition, in the battery storage case disclosed in JP-A-54-164226, the above-mentioned problems are solved, but in general, the joining between the openings of the pair of case halves is performed using an ultrasonic welder or Several kg using a high frequency welding machine etc.
A commonly used method is to apply vibrational energy such as ultrasonic energy to the bonding surfaces while applying a pressure of In a case such as a storage case in which a pair of case halves having substantially the same shape are joined together, there is a problem in that welding by ultrasonic welding is hindered. In other words, in ultrasonic welding, in which the joint surfaces of the case halves generate frictional heat and weld due to longitudinal vibration applied in a direction perpendicular to the joint surfaces of the case halves, it is difficult to attach terminal fittings that are flat surfaces. Because the conduction of ultrasonic vibrations to the surfaces (end surfaces) and the joining surfaces of the end surfaces and the arched side surfaces are different, the ultrasonic vibrations are attenuated on the arched side surfaces, resulting in uniform welding. There were some problems that made it difficult to do. Also,
If welding conditions are set based on this arched side surface, it will be necessary to apply a fairly large amount of ultrasonic vibration to the outer surface of the case at the flat joint between the mounting surface and the end surface where welding can be easily performed. There was a problem in that the product would be eluted and the value of the product would be lost in terms of size and appearance. In addition, other bonding methods, such as the adhesive fixing method, have poor workability, require an additional means to fix the pair of case halves, and require time to leave the case after bonding, which is time-consuming. This is not a preferred bonding method because there are problems such as loss of adhesive and the appearance of the surface becomes dirty due to adhesive extrusion. The present invention was developed in view of the above circumstances, and utilizes the ultrasonic welding method, which is effective in terms of manufacturing cost and quality, to reduce the pressure force in ultrasonic welding and to apply it over a wide range. It is possible to widen the manufacturing conditions, it is easy in terms of workability and management, and it is possible to lower the welding pressure, which eliminates the influence of welding on internal parts and connections. To provide a battery storage case that can improve performance and reliability, can be easily fixed to a device, etc., can reduce the volume of the device side required for fixing, and has great practical value. [Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention provides an opening edge of a two-split case consisting of a pair of case halves, each of which has an arched outer surface connected to the opening edge. In a battery storage case formed by welding the two case halves together, a step is provided on the arched surface near the opening edge of one or both case halves to form a flat surface parallel to the joining surface of both cases. did. [Function] In this way, by providing a stepped portion on the arched surface near the opening edge of one or both case halves to form a flat surface parallel to the joint surface of both cases, welding is prevented. Ultrasonic vibration energy is applied in a straight line to the area to be welded, making it easy to achieve uniform welding. [Example] Hereinafter, an example of a battery storage case according to the present invention shown in the drawings will be described. Figure 1 shows the first battery storage case according to the present invention.
Fig. 2 is a front view, Fig. 3 is a right side view, Fig. 4 is a rear view, Fig. 5 is a cross-sectional view, Fig. 6 is a longitudinal sectional view, and Fig. 7 is a rear view. FIG. 8 is an exploded perspective view, and FIG. 9 is a cross-sectional view of the device attached to the device. The battery storage case according to the present invention is made of ABS resin,
It consists of a two-part case consisting of a pair of case halves 1 and 2 made of thermoplastic resin such as polycarbonate resin. The front case half 1 has upper and lower end surfaces 14 and 15 formed as flat surfaces, and an outer surface 11 formed as an arch-shaped curved surface.On the other hand, the back case half 2
The upper and lower end surfaces 24 and 25 are formed as flat surfaces, and the outer surface 20 is formed as a flat surface 21 and arched surfaces 22 and 23 continuous to this flat surface 21. Steps 22a and 23a are provided on the arched surfaces 22 and 23 near the opening edges of the back case half 2, and a flat surface 22b parallel to the joining surfaces 1a and 2a of both cases 1 and 2 is provided. , 23b are formed. Furthermore, a partition wall 12 that partitions the batteries A and A housed in the case halves 1 and 2 is protruded from the center of the inner surface of the case half 2 on the back side. In addition, an electrical connection terminal with the device side of the terminal fittings 3, 3, which is electrically connected to the terminal parts a, a of the batteries A, A, extends from the upper end surface 14 of the front case half 1 to the upper part of the outer surface 11. Cutouts 13, 13 are provided for exposing the surfaces 3a, 3a to the front side. Further, a convex portion 26 is provided in the vertical direction on the end surface of the back case half 2 opposite to the front case half 1, while the convex portion 26 is provided on the opposite end surface of the front case half 1. A recess 16 corresponding to 26 is provided in the vertical direction. Note that the flat surface 22
b, 23b are formed of surfaces parallel to the joint surface 2a of this convex portion 26. In addition, the flat surface 22 on the back case half 2
The step portions 22a and 23a forming the step portions 22a and 23b may be partially elongated in the vertical direction as shown in FIGS. A plurality of them may be provided by partially dividing them in the vertical direction. With the above configuration, the bottoms of both case halves 1 and 2 will be exposed to overheating and
A connecting terminal 4 incorporating an overcurrent protection element is arranged,
The batteries A and A are stored between the battery storage chambers of both case halves 1 and 2 so that the bottom terminals of the batteries A and A come into contact with the connection terminal 4. In addition, the terminal fittings 3 are placed in the notches 13, 13 of the case half 1 with the electrical connection terminal surfaces 3a, 3a facing upward.
Insert 3. Then, in this assembled state, the joining surfaces 1a and 2a of both case halves 1 and 2 are welded together using an ultrasonic welding machine to form an integral structure. In this ultrasonic welding, as mentioned above, the arched surface 2 near the opening edge of the back case half 2
Since step portions 22a and 23b are provided on 2 and 23 to form flat surfaces 22b and 23b parallel to the joint surfaces 1a and 2a of both cases 1 and 2, ultrasonic vibration energy is applied linearly to the area to be welded. is given,
Uniform welding can be easily performed. Therefore, a battery storage case consisting of both case halves made of polycarbonate resin is constructed such that the welded fusion dimension of the fitting ribs consisting of a convex portion and a recessed portion is 0.3 mm, and the combined thickness of both case bodies in the battery storage case is Frequency 20KHz with 17.1mm,
The conventional case and the invented case are welded using an ultrasonic welding machine with an output of 1200 Watts, and the battery thickness (finished dimensions in the above case design) is
16.80 to 17.0 mm), and the appearance and drop impact strength were compared. The welding conditions at that time were to set the ultrasonic oscillation time to 0.5 seconds and vary the pressure. Next, the above results are shown in the table below. Table 1 shows the battery thickness dimensions (the maximum width L when the two case halves are butted together is 17 mm), and Table 2 shows the appearance (melting and protruding joints, whitening, Table 3 shows the drop impact strength (represents the number of cracks when dropped 10 times from a height of 1 m above a vertical surface onto an oak tree). .

【table】

【table】

[Effect of idea]

As described above, the present invention provides a step on the arched surface near the opening edge of one or both case halves to form a flat surface parallel to the joining surface of both cases, so that welding Ultrasonic vibration energy is applied linearly to the desired area, making it easy to achieve uniform welding. In addition, the pressure force in ultrasonic welding can be lowered and applied over a wider range, making it possible to widen the manufacturing conditions, making it easier in terms of workability and management, and lowering the welding pressure. Performance is improved by eliminating the effects of welding on internal parts and connections.
The reliability can be improved, and it can be easily fixed to a device, etc., and the volume of the device required for fixing can be reduced, which has great practical value.

[Brief explanation of drawings]

Figure 1 shows the first battery storage case according to the present invention.
2 is a front view thereof, FIG. 3 is a right side view thereof, FIG. 4 is a rear view thereof, FIG. 5 is a cross-sectional view thereof, and FIG. 6 is a longitudinal sectional view thereof. FIG. 7 is a perspective view of the rear side, FIG. 8 is an exploded perspective view of the device, FIG. 9 is a cross-sectional view of the device attached to the device, FIG. 10 is a plan view of the second embodiment, and FIG. Figure 11 is its front view, Figure 12 is its right side view, and Figure 13 is its front view.
14 is a perspective view of the third embodiment as seen from the back side, FIG. 15 is a perspective view of the third embodiment as seen from the back side, FIG. 16 is a plan view of the third embodiment, and FIG. 17 is a perspective view of the third embodiment. A front view, FIG. 18 is a right side view, and FIG. 19 is a rear view. 1, 2... Case half body, 11, 20... Outer surface, 22a, 23a... Step portion, 22b, 23b...
...Flat surface.

Claims (1)

[Scope of utility model registration request] In a battery storage case formed by welding the opening edges of a pair of case halves, each of which is made up of a pair of case halves each having an arched outer surface connected to the opening edge, one or both of the case halves may be welded together. A battery storage case characterized in that a stepped portion is provided on an arch-shaped surface near an opening edge to form a flat surface parallel to a joining surface of both cases.