JP2002330546A - Battery pack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a chain short circuit that occurs in carrying and a short circuit caused by a metal product, and also to prevent a state of charging and the like by the other apparatus than an exclusive charger to occur. SOLUTION: A battery pack is the one that disenables charging and discharging by the other apparatus and place than the exclusive charger and place. The battery pack comprises: a secondary battery; a charge/discharge control element that is connected in series to the secondary battery and controls charge and discharge; a protective function control means that detects at least a terminal voltage of the secondary battery, determines excess charge and discharge and controls the on/off of the charge/discharge control element; a switch that switches on or off when mounted to the exclusive apparatus and place; and an on/off control means that detects the on/off of the switch and controls the on/off of the charge/discharge control element. Thereby, the charge/discharge control element is allowed to be turned on only when mounted to the exclusive apparatus and at a prescribed place, thus preventing the charging by the other apparatus than the exclusive charger, to improve the safety of the battery pack.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery pack that cannot be charged or discharged except in a dedicated device or place.

[0002]

2. Description of the Related Art In recent years,
Portable electronic devices such as mobile phones, notebook computers, video cameras, and digital cameras use lithium-ion secondary batteries as power supplies.
Along with the reduction in weight, there is a demand for a smaller and lighter battery pack as its power source.

FIG. 3 is a diagram showing a configuration example of a conventional battery pack, and FIG. 4 is a diagram showing another configuration example of a conventional battery pack. 1 is a secondary battery, 2 is a protection function controller, and SW1 is The discharge control element SW2 indicates a charge control element.

In FIGS. 3 and 4, a protection function control section 2 monitors a terminal voltage of at least a secondary battery and controls a discharge control element SW1 and a charge control element SW2 to have a charge and discharge control function. . As shown in FIGS. 3 and 4, a battery pack having +/− 2 pole output,
Battery packs that do not have an electrical connection function with the main unit that controls charging / discharging on / off are in a state where charging and / or discharging can always be performed. There is a possibility that a state such as charging by a device other than the dedicated charger may occur.

In a battery pack used for such a portable electronic device, a dedicated battery having a battery mounting portion adapted to the shape of the dedicated battery for a secondary battery is required, and a battery pack having a similar pack shape is erroneously mounted. Japanese Patent Application Laid-Open No. H11-178220 discloses that a safety circuit contact terminal for receiving information on a unit cell is provided, and a safety circuit terminal using a lithium ion secondary battery or the like is provided. A general-purpose battery charger for a single cell has been proposed which distinguishes between a single battery having the battery and a single battery having no terminal for a safety circuit using a nickel-cadmium battery or the like and enabling charging of any of them. The conventionally proposed battery charger for unit cells has a safety circuit contact terminal for making electrical connection for charging, in addition to the +/- output terminal, and performs only charging control.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has a simple structure in which a short-circuit caused by a chain, a short-circuit caused by a metal object, a state other than a dedicated charger, and the like occur. It is to prevent that.

[0007] Therefore, the present invention relates to a battery pack for disabling charging / discharging other than a dedicated device / place, comprising: a secondary battery; a charging / discharging device connected in series with the secondary battery to control charging / discharging. A control element, protection function control means for detecting overcharge / discharge by detecting at least a terminal voltage of the secondary battery and controlling on / off of the charge / discharge control element, and when attached to a dedicated device / place. A switch for turning on or off, and on / off control means for detecting on / off of the switch and controlling on / off of the charge / discharge control element are provided.

The switch is turned on by a contact when the switch is mounted on a dedicated device or place, and is turned off when the switch is removed. The on / off control means is configured to control the charge / discharge control element when the switch is off. Is turned off to disable charge / discharge, and the on / off control means controls on / off of the charge / discharge control element directly or via a protection function control means.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a view showing an embodiment of a battery pack according to the present invention, wherein 1 is a secondary battery, 2 is a protection function control section, 3 is an on / off control section, SW1 is a discharge control element, and SW2 is charge control. The element SW3 indicates a switch.

In FIG. 1, a discharge control element SW1 is turned on / off under the control of a protection function control unit 2 or an on / off control unit 3 to control the discharge of the secondary battery 1, and a charge control element SW2 is provided with a protection function. The charge of the secondary battery 1 is controlled by turning on / off under the control of the function control unit 2 or the on / off control unit 3, and the switch SW3 is turned on / off by structural contact.

The protection function control unit 2 monitors at least the terminal voltage of the secondary battery 1 to determine overcharging / discharging, and controls ON / OFF of the discharge control element SW1 and the charge control element SW2 to perform a charge and discharge control function. Have The discharge control element SW1 and the charge control element SW2 are both turned on so that charge or discharge or either of them can be always performed. Discharging is stopped by turning off the discharge control element SW1, and the charge control element SW2 is turned off. Turn off to stop charging.

The on / off control unit 3 detects the on / off state of the switch SW3 and directly or via the protection function control unit 2 turns on / off the discharge control element SW1 and the charge control element SW2.
It controls off. Therefore, the function of controlling on / off of the discharge control element SW1 and the charge control element SW2 is directly or directly from the on / off control section 3 by the function of the protection function control section 2 or the on / off control section 3. 2 is realized.

The switch SW3 is turned on, for example, by a structural contact only when the switch SW3 is mounted on a predetermined place of a structure such as a dedicated electronic device or a charger, and the switch SW3 is turned on. When the on / off control unit 3 detects this, the function of the on / off control unit 3 controls the discharge control element SW1 and the charge control element SW2 to be turned on directly or via the protection function control unit 2. As a result, the battery pack is in a state where charging and / or discharging can be always performed. When the battery pack is removed, the switch SW3 is turned off, and the switch SW3 is turned off.
Is detected, the discharge control element SW1, the charge control element SW
By controlling 2 to off, charging / discharging in places other than the exclusive structure is disabled.

The protection function control unit 2 detects, for example, the terminal voltage of the secondary battery 1 to determine overdischarge / overcharge, and when it is determined that the battery is overdischarged, controls the discharge control element SW1 to off. Discharging is stopped, and when it is determined that the battery is overcharged, the charge control element SW2 is turned on to stop charging.
In this way, charging / discharging is enabled only when the battery pack is mounted on a dedicated device / place, charging / discharging outside the dedicated device / place is disabled, and safety in handling the secondary battery pack is improved.

FIG. 2 is a view showing another embodiment of the battery pack according to the present invention, wherein SW1 and SW1 'denote discharge control elements, and SW2 and SW2' denote charge control elements. In FIG. 2, the switch SW3 is turned on by a structural contact when the switch SW3 is mounted on a dedicated device / place, and the switch SW3 is turned on / off.
Is detected, by the function of the on / off control unit 3, directly or via the protection function control unit 2, the discharge control element SW 1,
The charge control element SW2 is turned on. As a result, when the battery pack is in a state where charging or discharging or any one of them can be always performed, the protection function control unit 2 detects the terminal voltage of the secondary battery 1 to determine overdischarge / overcharge, and When it is determined to be in the state, the discharge control element SW1 'is controlled to be turned off to stop discharging, and when it is determined to be in the overcharge state, the charge control element SW2' is controlled to be turned on to stop charging.

It should be noted that the present invention is not limited to the above embodiment, and various modifications are possible. For example, in the above-described embodiment, a switch that is turned on by structural contact is provided, and the discharge control element SW is turned on by detecting the on state so that charging or discharging or any one of them can be always performed.
1. The charge control element SW2 is controlled, but the on / off may be reversed, and a proximity switch that is turned on / off at a facing position is provided instead of a switch that is turned on / off by structural contact. It may be.

Further, the protection function control section detects the terminal voltage of the secondary battery to determine overdischarge / overcharge, and turns off the discharge control element SW1 and the charge control element SW2 to stop charging / discharging. The charge / discharge current may be limited, or the charge / discharge current may be limited by detecting the charge / discharge current to determine the overcurrent, and further detecting the temperature of the battery pack to determine the overheating state. .

[0018]

As is apparent from the above description, according to the present invention, there is provided a battery pack which disables charging / discharging except in a dedicated device / place, wherein a secondary battery and a secondary battery are connected in series. A charge / discharge control element connected to the secondary battery for controlling charge / discharge; a protection function control means for detecting overcharge / discharge by detecting at least a terminal voltage of the secondary battery and controlling on / off of the charge / discharge control element; A switch that is turned on or off when the switch is mounted on a device or a location and an on / off control unit that detects on / off of the switch and controls on / off of the charge / discharge control element are provided. The charging / discharging control element can be turned on only when the charging / discharging control element is attached to a predetermined place of the charger, so that charging by a device other than the dedicated device can be prevented, and the safety of the battery pack can be improved.

The switch is turned on by a contact when the switch is mounted on a dedicated device or place, is turned off when the switch is removed, and the on / off control means controls the charge / discharge control element to be off when the switch is off. The on / off control means controls on / off of the charge / discharge control element directly or via the protection function control means, so that charge / discharge cannot be performed in a state where the charge / discharge control element is detached from a dedicated structure. As a result, it is possible to avoid a short circuit caused by a chain or a metal object when carrying the battery pack, thereby improving the safety of the battery pack.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of a battery pack according to the present invention.

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

FIG. 3 is a diagram illustrating a configuration example of a conventional battery pack.

FIG. 4 is a diagram showing another configuration example of a conventional battery pack.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... secondary battery, 2 ... protection function control part, 3 ... ON / OFF control part, SW1: discharge control element, SW2 ... charge control element,
SW3 ... Switch

Claims (3)

[Claims] 1. A battery pack for disabling charging / discharging other than a dedicated device / place, comprising: a secondary battery; a charging / discharging control element connected in series with the secondary battery to control charging / discharging;
Protection function control means for detecting overcharge / discharge by detecting at least the terminal voltage of the secondary battery and controlling on / off of the charge / discharge control element; and turning on / off when attached to a dedicated device / place Switch and the on /
A battery pack, comprising: on / off control means for detecting on / off and controlling on / off of the charge / discharge control element. 2. The switch is turned on by a contact when the switch is attached to a dedicated device or place, and is turned off when the switch is removed. The on / off control means is configured to control the charge / discharge when the switch is off. 2. The battery pack according to claim 1, wherein the control element is turned off to disable charging and discharging. 3. The on / off control means controls the on / off of the charge / discharge control element directly or via a protection function control means.
2. The battery pack according to claim 1, wherein turning off is controlled.