KR100989061B1 - Battery pack for military force - Google Patents

Abstract

PURPOSE: A battery pack is provided to automatically change the mode of a walkie-talkie to a safety mode controlled by a battery protection circuit module for securing the safety of the battery pack. CONSTITUTION: A battery pack comprises the following: more than one battery; a field effect transistor connected to both positive electrode ends of the battery; a control circuit unit including a protection circuit module controlling the field effect transistor to prevent the discharge of the battery, by being connected to the battery; and a normal/safety mode conversion module connected to the field effect transistor and the control circuit unit.

Description

Battery pack for military force

The present invention relates to a military battery pack for ensuring safety and reducing power consumption, comprising: at least one battery 30; A field effect transistor (FET) 40 connected to the anode terminal (+) of the battery 30; The field effect transistor 40 is connected to the battery 30, monitors a cutoff voltage of the battery 30, and controls the discharge of the battery 30 when the battery 30 falls below the cutoff voltage. Control circuit unit 10 including a protection circuit module 12 for controlling the; And the battery 30, the field effect transistor 40, and the control circuit unit 10, and directly connect the negative terminal (−) of the battery 30 to the FET 40 or the control circuit unit 10. It provides a military battery pack including; general / safe mode switching module 20 to switch to each other to connect through. According to such a battery pack, when the battery pack is mounted on the radio, it automatically switches to the safe mode controlled by the battery protection circuit module to ensure safety, and when the battery pack is separated from the radio by a field effect transistor (FET). By automatically switching to the controlled normal mode, power consumption of the battery pack can be reduced.

Recently, safety accidents such as leakage, rupture, explosion, etc. have frequently occurred while storing or using military radios equipped with lithium primary batteries. In order to prevent such a safety accident, the battery pack is generally equipped with a protective device for the safety device. The protection circuit for the safety device monitors the total voltage of the collective battery and controls it with a field effect transistor (FET) and when the arbitrary battery falls below the cut-off voltage while monitoring the voltage of the individual unit battery. There is a way that the protection circuit works to block the external output current while the microcomputer sends a signal to the FET.

1 is a circuit diagram of a conventional battery pack, in which a plurality of unit batteries are connected in series to form a collective battery, and diodes are connected in parallel to each unit battery to prevent reverse charging. In order to exhaust the remaining lithium in the lithium primary battery, an FDC is attached to both ends of the assembled battery, and the battery voltage maintaining device and overcurrent to prevent the battery pack voltage from falling below the threshold voltage. A protection element (PTC element) is attached.

As shown in the drawing, a diode connected in parallel to each unit battery of a conventional battery pack exhausts the battery capacity of the battery having the smallest capacity among each unit battery and thus cannot pass current. Bypassing it shares the electrical shock the battery will bear. However, to allow current to flow through the diode, the diode's anode must have a higher potential than the cathode. This means that the negative end of the battery has a higher potential than the positive end, and due to the limitation that these conditions must be met, the reverse charge protection diode does not properly implement the protection function of overdischarge prevention, which leads to safety accidents caused by forced over discharge. There is a problem that occurs frequently.

In addition, Patent Application No. 2005-88264 discloses a "complete prevention device of a lithium battery", the above technique is to improve the safety by exhausting the lithium remaining inside the lithium primary battery when the battery pack is disposed In this case, due to the continuous discharge of the battery pack, there is a problem that the arbitrary battery becomes a forced over-discharge state, rather it is pointed out as a factor of safety accidents. In addition, the voltage holding device mounted on the battery pack has been disclosed to prevent the total voltage of the battery pack from dropping below the cut-off voltage, but the result is that the random battery having the smallest capacity is forcibly over discharged. . That is, when the battery pack reaches the blocking voltage, the discharge is stopped, and the voltage of the battery pack is increased due to the characteristics of the battery, and when the voltage of the battery pack is recovered, the discharge is resumed again. However, if this process is continuously repeated, the random battery having the smallest capacity in the battery pack continuously intermittently discharges and eventually leads to a forced over-discharge state, thereby forcing the overcharged lithium primary battery to the battery. As potential heat accumulates continuously, safety accidents due to internal short circuits are caused by molten lithium polarization.

In order to solve this problem, in Patent No. 0750295, "Battery Protection Circuit",

PCM IC (Protection Circuit Module IC) that monitors the voltage of individual unit batteries

An interposing battery protection circuit has been proposed.

Such a battery protection circuit device is a method particularly used in a battery pack using a lithium secondary battery. However, when such a battery protection circuit is installed in the battery pack, even when the battery pack is not used, the current is continuously discharged to operate the protection circuit and power is consumed. If power consumption is continuously generated despite not using the battery pack as described above, there is a problem in that the life of the battery pack is shortened by reducing the battery capacity.

For example, even if the battery is stored without using about 50μA of current to drive the protection circuit, the capacity of 1,200μA per day is reduced, and the capacity of 0.438Ah in one year. In the case of the secondary battery is not a big problem because it is recharged, but the use of the primary battery, especially when using a small capacity battery can be said that the effect is very large. In particular, military batteries are required to maintain 75% of their initial capacity after five years in the ROC standard. In addition, the protection circuit installed in consideration of battery safety reduces the battery capacity, and the protection circuit is temporarily disabled due to the voltage of the lithium secondary battery being below the cutoff voltage due to the use of military radios requiring initial high current. It can also be placed on.

Therefore, in order to solve this problem, the above patent requires the selection switch to be installed in the battery pack equipped with the battery protection circuit. When the battery pack is not used, the selection switch is manually turned to the normal mode to be affected by the control circuit part. It is controlled by FET to reduce power consumption by protection circuit operation. In addition, when the battery pack is used, the control circuit unit monitors and uses each unit battery voltage by manually turning the selector switch to the safe mode.

However, in the above manner, there is a problem in that the use of the radio to switch the selection switch of the battery pack artificially used every time, even if the user careless use the battery pack by turning the selection switch to the safe mode When stored, there is a risk of shortening the life of the battery pack by reducing battery capacity due to continuous power consumption by the battery protection circuit. In addition, even when the battery pack is in use when the normal mode, there is a problem that there is a lot of safety accidents such as leakage, burst, explosion, and the like.

Accordingly, the present invention has been made to solve the problems described above, an object of the present invention is to install the battery pack in the device by installing a normal / safe mode switching module to the battery pack for driving the device, In this case, the protection circuit module is operated in a safe mode, and when the battery pack is removed from the radio and stored, it is automatically switched to the normal mode to reduce the power consumption of the battery pack and to ensure safety when using the battery pack.

The present invention provides at least one battery (30) to achieve the above object; A field effect transistor (FET) 40 connected to the anode terminal (+) of the battery 30; The field effect transistor 40 is connected to the battery 30, monitors a cutoff voltage of the battery 30, and controls the discharge of the battery 30 when the battery 30 falls below the cutoff voltage. Control circuit unit 10 including a protection circuit module 12 for controlling the; And the battery 30, the field effect transistor 40, and the control circuit unit 10, and directly connect the negative terminal (−) of the battery 30 to the FET 40 or the control circuit unit 10. Provides a battery pack including; general / safe mode switching module 20 to switch to each other to connect through.

The control circuit unit 10 is connected to the protection circuit module 12, it is preferable to further include a capacitor 14 for enabling the protection circuit module 12 to operate even in a state below the breaking voltage.

The general / safe mode switching module 20 is preferably configured to automatically switch while the battery pack and the device driven by the battery is detached.

The battery is preferably at least one selected from a primary battery and a secondary battery.

As described above, according to the present invention, when the battery pack is installed in a battery pack, such as a walkie-talkie by installing a normal / safe mode switching module in the battery pack , the battery pack is driven by the battery protection circuit module By automatically switching to a safe mode that has the effect of ensuring the safety when using the battery.

In addition, when the battery pack is removed from the device, it automatically switches to the normal mode driven by the field effect transistor (FET), so that the protection circuit module is no longer operated, thereby reducing the power consumption of the battery pack during normal operation. There is.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings and examples.

The present invention relates to a battery pack having a normal / safe mode control module to automatically control two states of a battery pack, that is, a normal mode and a safe mode according to detachment of a battery and a device.

Here, the general mode and the safe mode will be described first.

(1) Normal mode

The general mode is a method of controlling the overall battery pack voltage by the FET 40 without being affected by the control circuit unit 10. When removing the battery pack from the radio, or storing the battery pack, the circuit is configured in normal mode so that the negative electrode of the battery is connected to the negative output terminal and the positive electrode of the battery passes through the FET 40 to the positive electrode. Exit to the output stage. The FET always operates if the total voltage of the battery pack does not fall below the cutoff voltage. If the battery pack is not used for a long time, the FET is selected to eliminate the current consumed to recognize the protection circuit.

(2) safe mode

The safe mode is controlled by monitoring the voltage of the individual unit batteries by the control circuit unit 10. Radio +/- terminals are separated up and down, and in case of battery pack, the circuit is connected and operated in normal mode through the lower socket. If the battery pack is mounted on the radio, it is switched to the safe mode through the upper terminal of the radio (see Fig. 3). In addition, if the battery pack is removed from the radio, the circuit connected to the safe mode is disconnected and driven in the normal mode. The safety mode monitors the voltage of each unit battery individually in the battery pack and directly controls the microcomputer when any one of the unit batteries is below the cutoff voltage, and sends the control signal to the FET 40 to cut the output to the positive end. That's the way. In this way, the radio can always be operated in safe mode to ensure safety and prevent safety accidents.

2 is a circuit diagram of a battery pack according to an embodiment of the present invention. Here, the battery pack includes a battery 30 and a field effect transistor (FET) 40 connected to the positive terminal (+) of the battery 30; And a general / safety mode switching module 20 for directly switching between the negative terminal (-) of the battery 30 and the FET 40 to be directly connected or connected through the control circuit unit 10.

As shown, in the normal mode, the normal / safety mode switching module 20 is placed in the state of (b), and in the safe mode, the general / safety mode switching module 20 is in the state of (a). It will be appreciated that the connection between the cathode terminal (-) of the battery 30 and the FET 40 is changed accordingly.

In addition, the control circuit unit 10 may be configured as a protection circuit module (PCM IC) 12 alone, it may be further connected to the capacitor (14).

Here, for example, in the case of a lithium primary battery, when the battery pack is mounted in the radio and enters a safe mode, a cutoff voltage at which the protection circuit module 12 does not operate due to an initial voltage delay (TMV) phenomenon at the time of setting the safe mode. Even in the following state, the capacitor 14 may be necessary to maintain the power required to operate the protection circuit module 12 for a predetermined time.

If any one of the batteries 30 individually connected to the protection circuit module 12 in the safe mode drops below the cutoff voltage, the battery 30 is controlled by a signal transmitted from the protection circuit module 12. Can be prevented from discharging anymore, thus preventing accidents caused by over-discharge of the battery.

3 is a schematic diagram illustrating a process of switching to a normal mode and a safe mode when a battery pack is mounted on or removed from a radio according to an embodiment of the present invention.

As can be seen from (a), when the battery pack is not mounted on the radio, the battery pack shows the circuit connection in the normal mode. The connection status will be shown, and the normal mode of operation can no longer be performed.

As described above, in the safe mode, the upper terminal of the radio is connected to the battery pack, and at that time, it can be automatically switched to the safe mode, and this automatic switching function will be said to be a key element of the present invention.

Although the present invention has been described in more detail with reference to the embodiments, the present invention is not necessarily limited to these embodiments, and various modifications can be made without departing from the spirit of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

1 is a circuit diagram of a battery pack according to the prior art.

2 is a circuit diagram of a battery pack including a protection circuit module according to an embodiment of the present invention.

Figure 3 is a schematic diagram for explaining the switching to the normal mode and the safe mode when the battery is attached and detached by the normal / safe mode switching module according to an embodiment of the present invention.

Claims (4)

In the military battery pack, the military battery pack is At least one battery; A field effect transistor (FET) connected to the positive terminal (+) of the battery; A control circuit unit connected to the battery and including a protection circuit module for monitoring a cutoff voltage of the battery and controlling the field effect transistor to control discharge of the battery when the battery falls below the cutoff voltage; And And a general / safety mode switching module connected to the battery, the field effect transistor, and the control circuit part, and configured to directly connect the negative terminal (-) of the battery and the FET or to switch each other through the control circuit part. The normal / safe mode switching module is to be configured to automatically switch the mode of the battery pack on the basis of the detachment of the battery pack and the device driven by the battery, The battery pack includes a battery pack socket, the device includes a terminal, the terminal included in the device and the battery pack socket included in the battery pack has a male and female coupling structure, When the device and the battery pack are separated, the terminal and the battery pack socket are separated, and when the device and the battery pack are coupled, the terminal and the battery pack socket are coupled in a contact manner. When the terminal and the battery pack socket are separated and contacted, the normal / safe mode switching module automatically switches to the safe mode by connecting the battery pack to a safe mode circuit, and the terminal and the battery pack socket are contacted. In case of disconnection, the normal / safe mode switching module automatically switches to the normal mode by connecting the battery pack to the normal mode circuit. The normal / safe mode switching module is installed in the battery pack, so that when the battery pack is mounted on the device driven by the battery pack, the normal / safe mode switching module is automatically switched to the safe mode driven by the protection circuit module. When the battery pack is removed from the device, safety is ensured, and the protection circuit module is no longer operated by automatically switching to the normal mode driven from the field effect transistor so that the battery pack is normally consumed. In order to save power, the +/- terminals of the device are separated up and down, and the circuit is connected and operated in a normal mode through the lower socket of the battery pack, so that the battery is artificially used whenever the device is used. Select switch to power on and off the pack Not to convert the copper to, military battery pack, it characterized in that that to overcome the passive reduction of the battery pack due to the continuous power consumption due to the incorrect manual switching. The method of claim 1, The control circuit unit, And a capacitor connected to the protection circuit module, the capacitor further enabling the protection circuit module to be operable even under a cutoff voltage. delete The method of claim 1, The battery is a military battery pack, characterized in that at least any one selected from the primary battery or secondary battery.

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