JPH08229852A - Battery pack connecting structure in power tool - Google Patents

Abstract

PURPOSE: To integrate a battery holder and a battery pack simultaneously with the electrical connection thereof by gripping both front-rear face electrodes formed at the side face of the battery pack and the inner wall surface of insert holes, using the connecting terminals of the battery holder. CONSTITUTION: A battery pack 1 is inserted from the lower part of a handle housing 20 in a power tool with a battery holder 22 assembled thereto. Thereupon the hook parts 18a of hook buttons 18 disposed at the lateral mounting parts 5 of a battery case 3 and energized outward by plate springs 17 while being prevented from slipping off upward by protrusions are locked to the locking parts 20a of the handle housing 20. At a connection part, the respective clamping parts 26a, 26b of spring terminals 24a, 24b clamp the U-shape parts 13 of electrode terminal plates exposed to both front and rear faces of side holes 7a, 7b and insert holes 8a, 8b. As a result, the integration of the battery pack 1 and battery holder 22 is attained simultaneously with electrical connection.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for connecting a battery pack accommodating a storage battery and a battery holder on the side of an electric tool on which the battery pack is detachably mounted.

[0002]

2. Description of the Related Art FIG. 5 shows a conventional connection structure, which is a battery pack 30 containing a plurality of storage batteries (not shown).
The handle housings 31, 31 of the electric tool
When the battery pack 30 is installed in a predetermined storage portion inside the handle 32, the positive and negative electrode terminal plates 3 provided on the upper portion of the handle 32 are installed.
0a and 30b are gripped by positive and negative spring terminals 35a and 35b provided on the terminal block 34 of the battery holder 33 fixed on the handle 32 side. It is done.

[0003]

In the battery pack connection structure described above, the spring terminals 35a, 35b are provided.
Area of contact between the electrode terminal plates 30a and 30b (current carrying capacity)
However, if a motor such as a vibration drill or an electric hammer is a relatively large tool, the contact resistance between the spring terminal and the electrode terminal plate increases.
In particular, in the above vibrating tool, chattering (rubbing between contacts or momentary separation) may occur at the contact portion to cause poor contact, so that the contact resistance further increases, resulting in heat generation and the electrode terminal plate 30a. , 30b will melt the synthetic resin terminal holder, or shorten the life of the storage battery on the battery side.

[0004]

SUMMARY OF THE INVENTION Therefore, the present invention provides a battery pack connecting structure which does not have the above-mentioned contact failure and can maintain a suitable connected state with a simple structure. Insertion holes are provided in the connection surface of the battery pack to the battery holder, and electrodes of the same pole are formed on each of the left and right side surfaces adjacent to the connection surface and the inner wall surface of the insertion hole which is the back side of the side surface. On the other hand, the battery holder is characterized in that connecting terminals capable of sandwiching electrodes of the same pole formed on the front and back surfaces are provided in a protruding manner. Further, the connection terminal may be formed by bending two stacked conductive plates symmetrically to form a sandwiching portion for the electrodes of the same pole, and further reinforcing plates may be stacked on the conductive plate. .

[0005]

When the battery pack is attached to the electric tool, the connection terminals of the battery holder grip the electrodes on the front and back surfaces formed on the side surface of the battery pack and the inner wall surface of the insertion hole on the back side thereof, so that the electrical connection is made. The battery holder and the battery pack are firmly integrated. At the same time, since the electrodes also come into contact with each other on the two front and back surfaces gripped by the connection terminal, a large contact area can be secured and the influence of contact resistance is reduced. Further, when the connecting terminals are formed by bending two conductive plates each to form an electrode sandwiching portion and further stacking reinforcing plates, the connecting terminals can be simply configured and the gripping force is also increased by the reinforcing plates.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a battery pack in which a plurality of storage batteries (two above and six below, 9.6 V in total) are housed in upper and lower battery cases 2 and 3 made of synthetic resin. 3 is integrated by welding or screwing. This battery pack 1 has electrode terminal plates 11a, 11 connected to the plus and minus sides of a storage battery above it.
b and a connecting portion 4 provided with a thermo terminal plate 12 connected to a built-in thermostat, a pair of mounting portions 5 that are locked to the lower ends of the halved handle housings 20 and 20 of the electric tool. , 5 and a locking portion 6 provided on the handle housing 20 and capable of locking a set plate to be described later are respectively provided. As shown in FIG. 2, the connecting portion 4 is formed on both side surfaces of the upper battery case 2 in the lateral direction, and a pair of side holes 7a and 7b are also cut out to the connecting surface 9 side.
And a pair of insertion holes 8a and 8b formed in the connection surface 9,
Then, from the vertical hole 4a provided on one end side in the longitudinal direction, the positive and negative electrode terminal plates 11a and 11b provided on the terminal holder 10 above the storage batteries 1a and 1a in the battery case 2 and the thermo terminal plate 12, respectively. The electrode terminal plates 11a and 11b are both exposed and are formed of a single conductive plate.
The U-shaped portion 13, the horizontal portion 14, and the contact portion 15 with the storage battery, which are worn on the short side wall portions 10a and 10b of the terminal holder 10, are each bent and formed. Therefore, the electrode terminal plates 11a and 11b have their respective poles on the side holes 7a and 7b side and the insertion holes 8a and 8b when assembled to the battery case 2.
The front and back two surfaces with the side are exposed. The insertion hole 8a,
8b is provided with hanging pieces 8c, 8c, 8c and a bottom plate 16 integral with the hanging pieces on three surfaces other than the electrode terminal plate side for dust prevention and short circuit prevention. By the way, in the connection surface 9, a bridge portion of the connection surface 9 is formed between the side hole 7a and the insertion hole 8a, and between the side hole 7b and the insertion hole 8b, whereby the electrode terminal plates 11a and 11b are formed. Therefore, it is possible to prevent the upper surface side of the electrode from being completely exposed to prevent both electrodes from easily short-circuiting.

On the other hand, the battery holder 22 on the electric tool side, which is connected when the battery pack 1 is mounted, is shown in FIG.
2, the positive and negative spring terminals 24 are attached to the synthetic resin terminal blocks 23 that are held in the assembled state by the seats 21 formed on the inner surface of each handle housing 20, respectively.
a and 24b are integrally provided, and each of the spring terminals 24a and 24b has two narrow conductive plates 25 and 2, respectively.
5 are overlapped, one end side is projected above the terminal block 23 to connect with the lead wire on the electric tool side, and the other end side is below the terminal block 23 in a separating direction, an approaching direction, and a separating direction.
The holding portion 26a, which is bent and diffracted so that the tip end side has an expanded shape,
26b are formed to have elasticity in the opposing direction of the conductive plates 25, 25, respectively. In addition, each conductive plate 25, 25
Reinforcing plates 27, 27 that are bent two times along the conductive plates 25, 25 are stacked on the outer surface of the. Further, the terminal block 23
A block-shaped spacer 28, which is orthogonal to the terminal block 23, is integrally fixed between the spring terminals 24a and 24b at the lower portion.

In the connection structure constructed as described above,
When the battery pack 1 is inserted from the lower part of the handle housing 20, 20 of the electric tool with the battery holder 22 assembled as described above, the battery pack 3 is provided on the left and right mounting portions 5 of the battery case 3 as shown in FIGS. The hook portion 18 of the hook button 18 is biased outward by the leaf spring 17 and is prevented from coming out upward by the projections 5a, 5a.
a engages with the engaging portions 20a that are inwardly returned at the lower edge of the handle housing 20, and the locked state is maintained by the biasing of the leaf spring 17 as it is. At this time, the connection part 4
Then, the sandwiching portions 26a and 26b of the spring terminals 24a and 24b have the side holes 7a and 7b side and the insertion hole 8 respectively.
Electrode terminal plates 11a exposed on the front and back surfaces of a and 8b,
The U-shaped portions 13 and 13 of 11b are respectively gripped, and the elasticity thereof causes a contact pressure in the clamping direction, so that the battery holder 22 and the battery pack 1 are integrated together with electrical connection. Since the U-shaped portions 13 and 13 of the electrode terminal plates 11a and 11b are provided with chamfered portions 19 and 19 at both corners thereof, the operations from the sandwiching of the sandwiching portions 26a and 26b to the entering and entering are smooth. Done. Further, since the side wall portions 10a and 10b of the terminal holder 10 are thick-walled integrally formed with the same heat-resistant synthetic resin as the terminal holder 10, the clamping force of the gripped spring terminals 24a and 24b can be further increased. It is possible to prevent deformation due to external force. As shown in FIGS. 3 and 4, the spacer 28 in the terminal block 23 also comes into contact with the connection surface 9 of the battery case 2 to suppress the rattling of the battery holder 22. Therefore, the spring terminals 24a, 24 are provided.
Together with the gripping effect of b, the integration of both is further enhanced, and chattering is less likely to occur even when vibration is applied by the vibrating tool. Further, each electrode has two conductive plates 25, 25, respectively.
Therefore, the contact area can be secured wider than in the conventional case, and the influence of the contact resistance can be reduced even in a motor with a large current. On the other hand, battery pack 1
The battery case 2 is formed with a step portion 2a, and four corners of the step portion 2a respectively match a pair of fitting portions 20b, 20b provided on the inner surface of each handle housing 20 in a mounted state. Therefore, the action of suppressing the rattling of the battery pack 1 is exerted here as well. Since the battery pack 1 of the present embodiment has the engaging portion 6 formed on the lower battery case 3 as described above, when the set plate 29 is axially attached to the handle housing 20, as shown in FIG. As described above, the attachment can be performed by the set plate 29 instead of the hook buttons 18, 18.

In the battery pack 1 described in the above embodiment, besides the sandwiching connection by the grip type spring terminals 24a and 24b, the electrode terminal plates 11a and 11b are also provided at both side positions by the side holes 7a and 7b. Since it is exposed, it can be used even with a power tool equipped with the conventional outer grip type spring terminals 35a and 35b as shown in FIG. 5, so that the range of use is not limited. Further, in the above-mentioned embodiment, the insertion holes are formed in the connecting surface 9 at two positions 8a and 8b, but it is possible to eliminate the partition between both insertion holes and to make one large insertion hole. In addition, the spring terminal 24a,
Although it has been described that the reinforcing plates 27, 27 are provided on 24b,
Instead of this, the spring terminals may be formed only by the conductive plates 25, 25. Further, in the above-mentioned embodiment, the battery holder 1 has been described as a 9.6V type, but of course the capacity and the shape of the battery case are not limited to those in the above-mentioned embodiment.

[0010]

As described above, according to the present invention, the battery holder on the tool side and the battery pack can be suitably integrated with a simple structure, and the contact area between the contacts can be secured larger than before. There are no problems such as chattering or increase in contact resistance with a vibrating tool, and the battery can be used in a good energized state. Of course, the battery life is not affected. Further, if each of the connecting terminals is formed by bending two conductive plates to form an electrode sandwiching portion and stacking reinforcing plates, the connecting terminals can be simply constructed and the gripping force is further increased.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a battery pack and a handle housing.

FIG. 2 is an exploded perspective view of a connecting portion.

FIG. 3 is an explanatory diagram showing a connection structure between a battery pack and a battery holder.

FIG. 4 is an explanatory diagram showing a connection structure between a battery pack and a battery holder.

FIG. 5 is an explanatory view showing a connection structure of a conventional battery pack.

[Explanation of symbols]

1 ... Battery pack, 2, 3 ... Battery case, 4 ...
・ Connecting parts, 5 ・ ・ Mounting parts, 6 ・ ・ Locking parts, 7a, 7b ・
・ Side holes, 8a, 8b ・ ・ Insertion holes, 9 ・ ・ Connecting surface, 10 ・
・ Terminal holders, 11a, 11b ・ ・ Electrode terminal plates, 12 ・
・ Thermo terminal board, 20 ・ ・ Handle housing, 22 ・
.Battery holders, 23 .. Terminal blocks, 24a, 24b
..Spring terminals, 26a, 26b .... Holding portions, 28
··Spacer.

Claims (2)

[Claims] 1. A battery pack connection structure for mounting a battery pack accommodating a storage battery on a battery holder provided on a tool side and electrically connecting them to each other, wherein a connection surface of the battery pack to the battery holder is provided. An insertion hole is provided, and electrodes of the same pole are formed on each of the left and right side surfaces adjacent to the connection surface and the inner wall surface of the insertion hole that is the back side of the side surface, while the battery holder is A battery pack connection structure for an electric power tool, wherein connection terminals capable of sandwiching electrodes of the same pole formed on two front and back surfaces are provided in a protruding manner. 2. The connection terminal is formed by bending two superposed conductive plates symmetrically to form a sandwiching portion of the electrodes of the same pole, and the conductive plate further includes a reinforcing plate. The battery pack connection structure for an electric power tool according to claim 1, wherein the battery packs are stacked.