JPH06111853A - Battery pack - Google Patents

Abstract

PURPOSE:To prevent generation of short-circuiting in a built-in battery even if a conductive member is brought into contact with between charge/discharge terminals under a condition where a battery pack is removed from an appliance main body and a charger. CONSTITUTION:Charging/discharging terminals 11, 12 are arranged at a side of upper case part 10 of a battery pack 1, which terminals 11, 12 are brought into contact with connection terminals 21, 22 of an electric appliance 2 and conducted electrically, and in the pack 1 a storage battery 3 is built in At the side of the storage battery 3 a battery terminal 30 for the battery 3 is arranged. When this pack 1 is installed in the appliance 2 electrical connection is made as the terminals 11 and 30 are brought into contact with each other by means of the terminal 21 while they 11 and 30 are separated when it is removed therefrom and the electrical connection is interrupted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery pack having a built-in storage battery, which is detachable from a battery application device such as a rechargeable drill driver.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 3, an electric device such as a rechargeable drill driver which is driven by being supplied with an electric current from a battery pack 1 having a storage battery 3 incorporated therein. 2 is known.

The battery pack 1 has an upper case portion 10
By mounting the charging device on the mounting portion 20 of the electric device 2, the charging / discharging terminal disposed on the outer surface of the upper case portion 10 at a proper position comes into contact with the contact metal fitting disposed inside the mounting portion 20. . Then, due to the conduction between the charging / discharging terminal and the contact fitting, the current from the storage battery 3 is supplied to the motor or the like of the electric device 2 through the charging / discharging terminal and the contact fitting.

On the other hand, when the capacity of the storage battery 3 is reduced due to the use of the electric device 2, the battery pack 1 is removed from the electric device 2, and the upper case portion 10 is attached to a charger (not shown) so that the inside of the battery pack 1 is removed. The storage battery 3 is charged, and after the charging is completed, the upper case portion 10 of the battery pack 1 is attached to the attachment portion 20 of the electric device 2 so that it can be reused.

[0005]

By the way, since the charging / discharging terminals are arranged so as to be exposed on the outer surface of the upper case portion 10 of the battery pack 1, when the battery pack 1 is removed from the electric device 2. Moreover, if a conductive material such as a wire or a nail is inadvertently contacted between both ends of the charge / discharge terminal, a short-circuit current may flow between the charge / discharge terminals, and the storage battery 3 may abnormally generate heat and fail.

The present invention solves the above problems and prevents a built-in battery from being short-circuited even if a conductive material contacts between charge / discharge terminals in a state where the battery pack is removed from the main body of the device and the charger. Intended to provide packs.

[0007]

In order to achieve the above object, the first aspect of the present invention is to connect a charging / discharging terminal which is exposed on the main body and is in contact with a connection terminal of a device to be conductive, and to the charging / discharging terminal. A battery pack having a built-in battery that includes an opening / closing means for opening / closing the connection between the battery and at least one of the charging / discharging terminals, the opening / closing means being closed when mounted on the equipment, It is configured to open when removed from.

According to a second aspect of the invention, the opening / closing means comprises a switch interposed between the charging / discharging terminal and the battery, and the actuator of this switch is arranged so as to be pressed when it is mounted on the device. I chose

Further, according to a third aspect of the present invention, the built-in battery is formed by connecting a plurality of batteries in series, and the opening / closing means is a biasing means for separating the batteries from each other when the battery is removed from the main body of the equipment. When the device is mounted, the device is pressed by the device to actuate the biasing means to bring the batteries into contact with each other.

According to a fourth aspect of the present invention, there is provided a battery pack having a charging / discharging terminal which is brought into contact with a connection terminal of a device for conduction, and a built-in battery which is connected to the charging / discharging terminal, wherein the charging / discharging terminal is inside the pack body. It is provided so as to be exposed on the projecting portion that can appear in and out of, and a switching means for switching the projecting portion between a projecting position with respect to the main body and a storing position.

[0011]

According to the battery pack of claim 1, when the battery pack is mounted on the device, the opening / closing means is closed to connect the built-in battery and the charge / discharge terminal, and the built-in battery is connected to the device via the charge / discharge terminal. When connected to the connection terminal and removed from the device, the opening / closing means is opened to disconnect the connection between the built-in battery and the charging / discharging terminal.

According to the battery pack of the second aspect, when the battery pack is attached to the device, the actuator is pressed by the device to turn on the switch, the built-in battery and the charging / discharging terminal are connected and removed from the device. Then, the actuator returns and the switch is turned off to disconnect the built-in battery from the charge / discharge terminal.

Further, according to the battery pack of the third aspect, when the battery pack is mounted on the device, the battery is pressed by the device to connect the batteries, and when the battery pack is detached from the device, the battery is separated by the biasing means. The connection between the batteries is cut off.

According to the battery pack of claim 4, the projecting portion is projected from the main body by the urging means to expose the charging / discharging terminal, and the charging / discharging terminal is mounted in the apparatus in this state, whereby the built-in battery is provided. Is electrically connected to the connection terminal of the device through the charging / discharging terminal, and the projecting portion is housed in the main body when removed from the device, so that the charging / discharging terminal is hidden in the main body.

[0015]

1 is a perspective view showing a first embodiment of a battery pack according to the present invention, and FIG. 1 shows an internal structure of the battery pack II.
FIG. 3 is a cross-sectional view taken along line II, and FIG. 3 is an external view showing an example of an electric device (rechargeable drill driver) 2 that can be driven when the battery pack 1 according to the present invention is mounted as a power source.

An opening 2a is formed at the lower end of the electric device 2, and an upper case portion 10 of the battery pack 1 described later is fitted into the mounting portion 20 of the electric device 2 through the opening 2a, so that the battery is The pack 1 is attached to the electric device 2. Further, at the lower end of the electric device 2, an edge 2b is bent toward the opening 2a side, and a hook 13 of the battery pack 1 described later is locked to the edge 2b. Thereby, the battery pack 1 is fixed to the electric device 2.

A pair of contact terminals 21 and 22 made of conductive leaf springs are vertically provided at positions facing the inner surface of the mounting portion 20. The contact terminals 21 and 22 are fixed at their upper ends to the terminals of the power switch 23 of the electric device 2 and are curved inward at appropriate lower portions. When the battery pack 1 is attached to the electric device 2, the charging / discharging terminals 11 and 12 of the battery pack 1 which will be described later are pressed against the curved portions. The lower ends of the contact terminals 21, 22 are locked to the ribs 23, 24, and even when the contact terminals 21, 22 come into contact with the charging / discharging terminals 11, 12, respectively, the contact terminals 21, 22 are bent. Is maintained so that the curved portion appropriately presses the charge / discharge terminals 11 and 12.

At least one storage battery 3 can be disposed inside the battery pack 1, and in the present embodiment, an upper case portion 10 is provided above the lower case body 1a. Charging / discharging terminals 11 and 12 are arranged in the upper case portion 10 at positions facing the side surfaces of the tip end portion so as to face the contact terminals 21 and 22. A hook 13 is arranged on the side surface of the battery pack 1, and the hook 13 is biased outward by a leaf spring 131 arranged inside the battery pack 1. Then, after the upper case portion 10 is mounted on the mounting portion 20 while the hook 13 is pushed inward of the battery pack 1, the hook 13 is released and the plate spring 131 causes the hook 13 to move to the edge 2b of the opening 2a. It is locked and the connection is maintained.

The charging / discharging terminal 11 is made of a conductive leaf spring, the lower end is fixed to the side surface of the upper case portion 10, and the upper portion is folded back inside the upper case portion 10. Further, a battery terminal 30 extending from one electrode (for example, positive electrode) position of the storage battery 3 is disposed on the side surface of the storage battery 3 facing the folded portion with a predetermined distance. On the other hand, the charge / discharge terminal 12 is connected to the lead wire 12
0, for example, is connected to the other electrode (for example, the negative electrode) of the storage batteries 3 connected in series.

When the upper case portion 10 of the battery pack 1 is fitted into the mounting portion 20 of the electric device 2, the charging / discharging terminal 11 abuts the contact terminal 21 and is pushed into the upper case portion 10. , Contacts the battery terminal 30 of the storage battery 3. At the same time, the charging / discharging terminal 12 contacts the contact terminal 22. As a result, one electrode of the storage battery 3 is electrically connected to the contact terminal 21 of the electric device 2 through the battery terminal 30 and the charge / discharge terminal 11, and the other electrode of the storage battery 3 is connected to the electric device 2 through the charge / discharge terminal 12. Terminal 22
And conduct. Moreover, when the battery pack 1 is removed from the electric device 2, the folded portion of the charging / discharging terminal 11 separates from the battery terminal 30 of the storage battery 3 due to the restoring force of the charging / discharging terminal 11. As a result, one electrode of the storage battery 3 is disconnected from the charge / discharge terminal 11.

As described above, when the battery pack 1 is attached to the electric device 2, one electrode of the storage battery 3 conducts to the contact terminal 21 of the electric device 2 and the other electrode conducts to the contact terminal 22. , The contact terminals 21, 22 with the current from the storage battery 3
Can be supplied to the motor or the like of the main body of the device.
When the battery pack 1 is removed from the electric device 2,
The charging / discharging terminal 11 is separated from the battery terminal 30 of the storage battery 3, and one electrode of the storage battery 3 is cut off from the charging / discharging terminal 11. Therefore, a conductive material such as a wire is inadvertently charged.
The short-circuit current does not flow to the storage battery 3 even if the charging / discharging terminals 11 and 12 are short-circuited by making contact with the storage battery 3 and
Can be protected from short circuit accidents.

Next, the second of the battery pack 1 according to the present invention.
An example will be described with reference to FIG. The same reference numerals as in FIG. 1 have the same functions. In the second embodiment, the micro switch 1 is provided on the upper end of the upper case 10.
4 are provided. In the micro switch 14, the normally open contact 141 is interposed between the charge / discharge terminal 111 and one electrode of the storage battery 3, and the actuator 142 thereof is projected upward from the hole 10 a on the upper surface of the upper case portion 10. It is installed in. This actuator 14
Reference numeral 2 turns on (closes) the normally open contact 141 when pushed in, and normally returns upward by an urging force (not shown). In addition, the upper case portion 10 is a proper place in the mounting portion 20 of the electric device 2, and the upper case portion 10 is the mounting portion 2 of the electric device 2.
A rib (not shown) is formed at a position where the actuator 142 abuts when the actuator 142 is fitted into 0.

Then, when the upper case portion 10 is fitted into the mounting portion 20 of the electric device 2 and the actuator 142 is pushed in by the rib inside the mounting portion 20, the normally open contact 1 is formed.
41 is turned on to electrically connect the charging / discharging terminal 111 and one electrode of the storage battery 3. When the battery pack 1 is removed from the electric device 2, the actuator 142 returns and the charge / discharge terminal 111 and one electrode of the storage battery 3 are disconnected.

As described above, in the second embodiment, since the micro switch 14 having a relatively small size is used, the micro switch 14 can be arranged in the upper space of the upper case portion 10, and the upper case portion 10 can be provided. Can be small.

Next, the third battery pack 1 according to the present invention
An example will be described with reference to FIG. The same reference numerals as in FIG. 1 have the same functions. In the third embodiment, among the plurality of storage batteries 3 connected in series,
The storage battery 31 housed in the upper case portion 10 is movable vertically in the upper case portion 10 by a predetermined dimension, and the storage battery 31 is moved relative to the storage battery 32 of the lower case body 1a in accordance with this moving operation. Are connected or disconnected.

The upper electrode of the storage battery 31 is connected to the charge / discharge terminal 112, and the lower electrode is connected to the battery terminal 33. In addition, a battery terminal 34 connected to one of the storage batteries 32 is provided above the storage battery 32 in the lower case body 1a.
Is attached, and the storage battery 31 and the storage battery 32 are connected by the contact of these battery terminals 33 and 34.

A spring 35 is interposed between the storage battery 31 and the storage battery 32 and extending from the lower end of the upper case 10 to a tubular portion 10a. The spring 35 causes the storage battery 31 to move upward. The storage battery 31 and the storage battery 32 are urged to separate from each other. The spring 35 and the storage battery 3
1 or an electrode of the storage battery 32, an insulating plate 36,
37 is provided to prevent the spring 35 from coming into contact with the electrodes of the storage batteries 31 and 32.

At the upper end of the upper case portion 10, a protrusion 1 is provided.
02 and a base portion 103 are arranged so as to be movable up and down, and a protrusion 102 thereof is projected upward from a hole 10a on the upper surface of the upper case portion 10. The base portion 103 is in contact with the storage battery 31 via the charge / discharge terminal 112. The mounting portion 20 of the electric device 2
Similar to the second embodiment, a rib (not shown) is formed in the inside at a position where it abuts the protrusion 102.

Then, the upper case portion 10 is fitted into the mounting portion 20 of the electric device 2, and the button 101 comes into contact with the rib inside the mounting portion 20 and is pushed downward, so that the base portion 103 causes the storage battery 31 to move. The battery 35 is pushed down against the urging force of the spring 35, the battery terminals 33, 34 contact each other, and the storage battery 3
1 and the storage battery 32 are connected. When the battery pack 1 is removed from the electric device 2, the storage battery 31 is pushed upward by the urging force of the spring 35, and the storage battery 31 and the storage battery 32 are separated from each other and cut off.
The other electrode of the storage battery 32 is connected to the charge / discharge terminal 12 via a lead wire.

As described above, since the storage batteries 31 and 32 are in the disconnected state, a conductive material such as a wire comes into contact between the charging / discharging terminals 112 and 12, and the storage battery 3 is short-circuited between them.
No short-circuit current flows to the.

Next, the fourth battery pack 1 according to the present invention
An example will be described with reference to FIGS. The same reference numerals as in FIG. 1 have the same functions. In the fourth embodiment, the upper case 103 is configured independently of the lower pack body 15 and can be stored in the lower pack body 15 by operating the lever 17. The upper case portion 103 can be loosely fitted in the opening 152 of the upper surface portion 151 of the lower pack body 15, and the upper case portion 1
A storage battery 38 is housed inside 03. The storage battery 38 is connected in series with another storage battery 39 in the lower pack body 15 via a lead wire. In addition, the storage battery 3
8 is mounted on the support base 104. This support 10
4, a spring 105 is loosely fitted to the small diameter part, and the lower part thereof is engaged with the projection 105a of the upper surface part 151 of the lower pack body 15. Then, the upper case portion 103 is pushed up together with the storage battery 38 by the biasing force of the spring 105,
As shown in FIG. 6, it projects above the upper surface portion 151 of the lower pack body 15.

On the side surface 103a of the upper case portion 103, as shown in FIG. 8, an opening 103b in which the sensor terminal 16 for detecting the battery temperature is arranged at the upper end and the opening 103b.
An opening 103c into which a protrusion 171 of the lever 17 described later is fitted is formed at an appropriate position below b, and the protrusion 10 is further provided below the opening 103c.
3d is projected. The charging / discharging terminals 11 and 12 are arranged at the upper part of the upper case portion 103 so as to face both side surfaces sandwiching the side surface 103a.

The lever 17 is supported on the upper surface 151 of the lower pack main body 15 so that the lever 17 is slidable only in the left-right direction in FIG. 9 by the hook 153a. This lever 17 has a protrusion 17 on the rear surface (left side in FIG. 9).
1 is provided in a protruding manner, an operation groove 17a is formed in the front portion, and a recess 172 is recessed in the lower surface. A compression spring 173 is disposed in the recess 172. This compression spring 173
Has one end erected on the rear surface of the recess 172 of the lever 17 and the other end erected on the upper surface 151 of the lower pack body 15 to form the recess 1
The rib 153 is loosely fitted into the rib 72 and abuts on the rib 153. The lever 17 is provided with the compression spring 173.
The protrusion 171 is urged toward the side surface 103a of the upper case portion 103 by the opening 103b or the opening 1b.
It is adapted to be fitted to 03c. Side base 154,
155 are arranged on the upper surface of the upper surface 151 at predetermined intervals on both sides of the rib 153, and notches 154a and 155a are formed on the rear end side so as to face each other.

The projection 103d is in contact with the back surface of the upper surface portion 151 to prevent the upper case portion 103 from coming out of the upper surface 151 of the lower pack body 15 by the urging force of the spring 105.

When the battery pack 1 is attached to the electric device 2, the lever 17 is slid rightward in FIG.
However, due to the urging force of the spring 105,
The upper surface 1 of the lower pack main body 15 to the position where it abuts the rear surface 1
It projects from 51 (state of FIG. 9). When the upper case 103 is fitted into the mounting portion 20 in this state, the contact terminal 21 of the electric device 2 contacts the charging / discharging terminal 11, and the contact terminal 22 contacts the charging / discharging terminal 12.

When the battery pack 1 is removed from the electric device 2, the lever 17 is slid to the right in FIG. 9 to disengage the protrusion 171 from the opening 103c, and the upper case portion 103 resists the urging force of the spring 105. Then lower pack body 1
5 and push the protrusion 171 of the lever 17 into the opening 103b.
To be fitted (state of FIG. 10). As a result, the upper case 103 is housed in the lower pack body 15, and the charge / discharge terminal 1
1 and 12 are notches 154a and 15 of the side bases 154 and 155.
It is covered by 5a. In this case, the upper case 103 is
Although it is urged upward by the urging force of the spring 105, the protrusion 171 of the lever 17 contacts the lower end of the opening 103b, and the upper case 103 is locked in the state of FIG.

As described above, when the battery pack 1 is removed from the electric device 2, the upper case portion 103 is attached to the lower pack body 1.
Since the charging / discharging terminals 11 and 12 can be housed in the battery 5 and covered, the charging / discharging terminals 11 and 12 do not come into contact with a conductive material, and a short circuit accident of the storage battery 3 can be prevented.

In the charger for charging the battery pack 1 of the present invention, the portion to which the battery pack 1 is attached has the same shape as the attachment portion 20 of the electric device 2, and the battery pack 1 is attached to the charger. At this time, one electrode of the storage battery 3 is brought into conduction with the contact terminal of the charger, and the other electrode is brought into conduction with the contact terminal of the charger.

[0039]

According to the present invention, since the opening / closing means is opened when the battery pack is detached from the device, the connection between the built-in battery and the charging / discharging terminal is cut off, and the conductive material such as the wire is inadvertently charged / discharged. Even if the terminals come into contact with each other, a short-circuit current can be prevented from flowing from the built-in battery, and the built-in battery can be protected.

Further, when the battery pack is detached from the device, the projecting portion provided with the charging / discharging terminal can be housed in the pack body, so that a conductive material such as a wire may come into contact with the charging / discharging terminal. Therefore, a short circuit between the charge / discharge terminals can be reliably prevented.

[Brief description of drawings]

1 is a sectional view taken along line II-II of FIG. 2 showing a first embodiment of a battery pack.

FIG. 2 is a perspective view showing a first embodiment of a battery pack according to the present invention.

FIG. 3 is an external view showing an example of an electric device (rechargeable drill driver) to which a battery pack is attached.

FIG. 4 is a sectional view showing a second embodiment of the battery pack.

FIG. 5 is a sectional view showing a third embodiment of the battery pack.

FIG. 6 is a perspective view showing a fourth embodiment of the battery pack, showing a protruding state of the upper case portion.

FIG. 7 is a cross-sectional view showing a battery pack according to a fourth embodiment of the present invention, showing how the upper case portion is housed.

FIG. 8 is an exploded perspective view of a battery pack according to a fourth embodiment.

9 is a sectional view taken along line IX-IX in FIG.

10 is a sectional view taken along line XX of FIG.

[Explanation of symbols]

 1 Battery Pack 1a Lower Case Body 2 Electrical Equipment 3, 31, 32, 38, 39 Storage Battery 10, 103 Upper Case Section 11, 12, 111, 112 Charge / Discharge Terminal 15 Lower Pack Body 17 Lever 20 Electrical Equipment Mounting Area 21, 22 contact terminal 30 battery terminal 103b opening 104 support base 105 spring 171 lever projection 154, 155 side base

Front page continuation (72) Inventor Masao Yamamoto 2026 Oshinohara, Yasu-cho, Yasu-gun, Shiga Within Shiga Kobayashi Seiko Co., Ltd.

Claims (4)

[Claims] 1. A battery pack having a charging / discharging terminal exposed on the main body, which is brought into contact with a connection terminal of a device to conduct electricity, and a built-in battery connected to the charging / discharging terminal, wherein the battery and the charging / discharging terminal are provided. And an opening / closing means for opening / closing a connection with at least one of the devices, the opening / closing means being configured to be closed when attached to the device and to be opened when removed from the device. And battery pack. 2. The opening / closing means comprises a switch interposed between the charging / discharging terminal and the battery, and an actuator of the switch is arranged so as to be pressed when mounted on the device. The battery pack according to claim 1, wherein: 3. The built-in battery is formed by connecting a plurality of batteries in series, and the opening / closing means is attached to the device and a biasing means for separating the batteries when the battery is removed from the device body. 2. The battery pack according to claim 1, further comprising: an actuating member that presses the device against the biasing means to bring the batteries into contact with each other when the device is pressed. 4. A battery pack having a charging / discharging terminal that comes into contact with a connection terminal of a device to conduct electricity, and a built-in battery connected to the charging / discharging terminal, wherein the charging / discharging terminal can project into and retract from the pack body. A battery pack, which is disposed so as to be exposed on a part and has switching means for switching the projecting part between a projecting position with respect to the main body and a storing position.