KR100211949B1 - Rechargeable batteries pack with charging status display - Google Patents

Abstract

The present invention relates to a rechargeable battery pack having a circuit for sensing the state of charge inside the rechargeable battery pack and having a counting display element on the surface thereof. An object of the present invention is to provide a battery pack which indicates a charging voltage when charging using a charger, and makes it possible to easily identify how much the battery is independently charged using its own power supply in an idle state of the rechargeable battery pack. The configuration includes display means for being installed in the rechargeable battery pack to indicate the state of charge and control means for controlling the display means by receiving power from the rechargeable batteries.

Description

Rechargeable battery pack shows charging status

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rechargeable battery pack, and more particularly, to a rechargeable battery pack having a circuit for detecting a charge state inside a rechargeable battery pack and having a counting display element on the surface thereof.

In general, a battery that can be recharged and reused after use is called a rechargeable battery. Among these rechargeable batteries are lead-acid batteries for use in automobiles and the like. Some of these items have a 'magic eye' that displays the quality of the battery inside. However, it is not an indication of voltage or current capacity, only a visual representation of the chemical reaction that occurs when two poles are immersed in the electrolyte of a lead-acid battery, which can only show whether the battery is good or bad.

First (a) 1 (d) is an external view of a typical rechargeable battery pack. First (a) A general rechargeable battery pack will be briefly described with reference to FIG. 1 (d) as follows.

Depending on the purpose of the system to use such rechargeable batteries can be obtained by stacking cells, and can be configured in various shapes depending on the use, such as a variety of power supply for emergency or portable system, but the external measuring device You can not know the voltage or capacity independently.

Second (a) degree 2 (c) is an internal circuit diagram of a typical rechargeable battery pack. Second (a) degree An internal circuit of a general rechargeable battery pack will be briefly described with reference to FIG. 2C.

These batteries are thermal sensing elements to prevent overheating when they are charged.They may have a bimetal switch such as SW1 embedded inside the pack in close contact with the battery, and a circuit capable of sensing voltage as shown in FIG. 2 (c). Although a separate charger may determine the end point of charging and complete charging, it is not related to implementing a means, a method, or a control device that independently knows the voltage, capacity, and the like.

Among these conventional rechargeable battery packs, rechargeable battery packs used in cordless phones, camcorders, PCs, walkmens, etc. are made of nickel-cadmium, nickel-hydrogen, and the like, and are portable and can be used in any position. Therefore, since most of portable devices are used while moving, the recharge is impossible. Three spare parts should be prepared. However, if the preliminary inspection is not carried out at this time, the battery may not be recharged at the time of use, or may be discharged naturally, and thus may not be used at a deterministic moment because the operating voltage cannot be maintained. Of course, if you insert it into a charging device with a check function of a rechargeable battery pack, a system to be used or a separate measuring device, you can know the battery pack's voltage, current and charge capacity. There was a problem that you do not know.

In order to solve the above problems, the present invention indicates a charging voltage when charging using a charger, and in the idle state of the rechargeable battery pack, to easily identify how much it is independently charged using its own power source. The purpose is to provide a battery pack.

A feature of the present invention for achieving the above object is to comprise a digital display means installed in the rechargeable battery pack indicating the state of charge and a control means for receiving the power from the rechargeable battery pack to control the display means.

Another feature of the present invention for achieving the above object is a first switch to be turned on (on) by the weight of the rechargeable battery pack in order to display the charging voltage when charging using a separate charger, charger A second switch that displays the voltage or current of the rechargeable battery pack itself for a while when the rechargeable battery pack is removed from the display, and a display that is turned off by pressing and releasing it when it is not It is further equipped with a third switch to cut off all the circuits when no operation is to minimize the battery consumption during storage.

First (a) 1 (d) is an external view of a typical rechargeable battery pack.

Second (a) degree 2 (c) is an internal circuit diagram of a general rechargeable battery pack.

3 (a) Figure 3 (d) is an external view attached to the counting state of charge display device according to the present invention.

4 is a circuit diagram of a circuit for displaying charging voltage and current according to the present invention.

5 is a circuit diagram of a charging voltage display circuit according to the present invention.

* Explanation of symbols for main parts of the drawings

11 14: counting state of charge display device

120A: power driver 120B: power driver

130: voltage detector 140: current detector

150: voltage and current selection unit 160: display value conversion unit

170: counting display unit 180: display value holding drive unit

220A: power driver 220B: power driver

230: voltage detector 260: display value converter

270: counting display unit

Hereinafter, one of the preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 (a) Figure 3 (d) is an external view attached to the counting state of charge display device according to the present invention. 3 (a) Referring to FIG. 3 (d), a capacitor having a state-of-charge display device according to the present invention will be briefly described as follows.

This is a digital display device such as a character display using an LCD, LED, or FED element attached to the front and rear, right and left of the surface or inside of the rechargeable battery pack. By incorporating or externally controlling a circuit, a device capable of displaying a charging voltage or a charging current independently when a rechargeable battery pack is being charged or stored.

The display element control part according to the present invention is implemented in two examples, as shown in FIG. 4 which can display voltage and current, and FIG. 5 which displays only voltage.

4 is a circuit diagram of a circuit for displaying charging voltage and current according to the present invention. Referring to Figure 4 describes a circuit for displaying the charging voltage and current according to the present invention.

First, the configuration of FIG. 4 includes a battery pack stack 110, a power driver 120A, a voltage detector 130, a current detector 140, a voltage and current selector 150, and a display value converter 160. , The counting display unit 170, and the display value holding driver 180.

In addition, in the upper part of FIG. 4, the power driver 120B is a circuit that can stably provide the VCC power required for the semiconductor devices to be placed in the control circuit as an example of another form of the power driver. It can be configured in other forms as in this example.

This is a display device suitable for rechargeable battery packs used in mobile phones, camcorders and PCs. This caused the SW1 to be pressed by the weight of the rechargeable battery pack to display the charging voltage when charging using the charger. In addition, when the rechargeable battery pack was removed from the charger, the current was displayed for a while by manually pressing and releasing the SW2, and the display was turned off by pressing and releasing the SW3 when the display was not needed even during the display. In other words, even if you do not turn off the switch, in other words, even if you forget to turn off the switch, push-type switches are applied to all switches, so that all circuits are automatically cut off after a predetermined time, thereby minimizing battery consumption during storage. Implement a device that can.

In addition, in this device, when using or storing the rechargeable battery pack, TR1, TR2, TR3, and TR4 are open, so the VCC is broken and no operation is performed. There is this.

Looking at each configuration of Figure 4 in more detail as follows.

First, since the rechargeable battery pack stacking unit 110 is applied to an existing commercialized product, voltages are not specified in order to be able to match various voltages. Is not specific as it is variable. On the + side of the stacking unit 110, the charging voltage is considered to be applied by a separate charger from the outside and the display is omitted, but the charging voltage or the voltage of the battery itself is applied to the present invention through a point A or a line. It is supplied either to the power supply of the device or to the measured voltage or current source.

The power driver 120A is connected to the charger and charged according to the control of the first switch SW1 and the first switch SW1 which are pressed by the weight of the battery pack stack 110 to regulate the charged voltage. The charging voltage transmitted through the diode D1 is configured by the constant voltage circuit BLK1 for supplying a necessary level of power to the device by operating the transistors TR1 and TR2. At this time, the power driver 120B, which is another embodiment described above, also differs in that only the first relay is used instead of the TR1 and TR2. The power supply driving units 120A and 120B are means for strengthening the connecting action of the first switch SW1, and supply power to TR1 and TR2 (or the first relay) even when a contact failure appears after the use period of the switch has elapsed. Switching electronically (or mechanically) serves to compensate for poor contact. This role is also applied to TR3 and TR4. By electronically switching the applied voltage, it serves as a complementary contact defect, thereby reducing the possibility of abnormal voltage detection value. Hereinafter, the power driver 120A will be described.

A third switch SW3 is connected to the power supply driver 120A to control the output of the constant voltage circuit BLK1 to the operating power of the internal circuit elements of the apparatus.

The voltage detector 130 intercepts and detects the charging voltage supplied from the outside by the control of the first switch SW1 by TR3 and TR4, and converts the detected charging voltage into a digital signal of 4 or 8 bits. Is composed of a voltage A / D converter BLK5.

The current detector 140 detects the current of the voltage charged in the battery pack stack 110 by a second relay and converts the detected charging current into a digital signal of 4 or 8 bits. A BLK6 and a second switch Sw2 for interrupting the current A / D converter BLK6. Specifically, the current detector 140 drives the second relay (relay 2) and the second relay (relay 2) to operate on the voltage charged in the battery pack stacking unit 110 by the second switch Sw2. A current limiting resistor R6 for flowing a required current and a maximum current limiting resistor R8 for allowing a maximum current to flow while preventing the burnout of the contact of the second relay (relay 2), and the second relay ( It is composed of a current A / D converter BLK6 for converting a current of a voltage charged in the battery pack 110 passing through the relay 2) into a 4 or 8 bit digital signal by driving the relay 2). .

The voltage and current selector 150 outputs two state signals according to the level of the charge supply voltage passing through the first switch SW1 and the level of whether the second switch SW2 is interrupted or not. 2: 1 multiple which selects one of the flop BLK2 and the output of the voltage A / D converter BLK5 or the current A / D converter BLK6 and outputs it as a 4 or 8 bit digital signal. A Lesser BLK3 is provided.

The display value converting unit 160 is a voltage and current value display converting circuit BLK4 for converting an output value of the voltage and current selecting unit 150 into a signal that can be displayed in visible letters or numbers.

The counting display unit 170 is composed of an LCD, LED, FED, etc., and displays the converted voltage and current values as a counting display device capable of displaying letters, numbers, and symbols. Here, the display unit is not specified because the display value converting unit and the display value holding driving unit can be configured to be suitable for any of the above devices.

In addition, the display value holding driver 180 starts the clock signal generation by the operation power of the device internal circuit elements supplied by pressing the second switch SW2 which interrupts the current A / D converter BLK6. A timer circuit BLK8 which operates only for a predetermined time by the generator BLK7 and the control signal output from the output of the clock generator BLK7 and the RS flip-flop BLK2 that outputs the above two status signals, and The diode D3 is configured to allow the output of the timer circuit BLK8 to pass in the forward direction.

Referring to the operation of the present invention configured as described above is as follows.

First, when the rechargeable battery pack is inserted into an external charger for charging, the first switch SW1 is pressed by the weight of the rechargeable battery pack, and is distributed to R1, R2, and R3 through the diode D1. The applied voltage is applied to the base side of TR1 and turns on TR2. Therefore, the constant voltage passing through the constant voltage circuit BLK1 is applied to all the circuits through SW3 (it is turned off by pressing and is usually larger) and starts to operate. In addition, the voltage divided by R1 and R3 is applied to the base side of TR3 and turns on TR4 and inputs the voltage divided by R4 and R5 into A of the multiplexer BLK3 as a digital value through the voltage A / D converter BLK5. On the other hand, it is input high to the S side of the RS flip-flop (where R is low by R6) and outputs high to output Q. This output turns off the timer circuit BLK8, selects the A side of the multiplexer, controls the voltage and current value display conversion circuit BLK4, converts it into a voltage value, and displays it. Therefore, when the first switch SW1 is pressed by the weight of the rechargeable battery pack (that is, when the rechargeable battery pack is inserted into an external charger), the power supply of the device according to the present invention is displayed. When the VCC is applied, the charging voltage applied to the rechargeable battery pack is displayed, and when the rechargeable battery pack is removed from the charger, the first switch SW1 pressed by its own weight is turned off, and the display is stopped while the VCC is cut off. There is a characteristic.

In addition, if you want to check the rechargeable battery pack in the storage state, it is possible to manually display the charged voltage by pressing the first switch (SW1), and also by pressing the second switch (SW2) manually specified in the timer circuit (BLK8) You can measure the current of the rechargeable battery pack only for a period of time.

The operation of measuring the current will be described in more detail.

When the second switch SW2 is pressed, the voltage divided by the relays 2 and R6 is applied to the base side of TR1 via D2 and turns on TR2. Therefore, the constant voltage passing through the constant voltage circuit BLK1 passes through the third switch SW3 (which is turned off by pressing and is normally enlarged), and then starts operation as VCC is applied to all circuits. At this time, since the signal passing through the diode D2 is reversed to the diode D1, TR3 and TR4 are not driven, and thus there is no consumption of unnecessary current passing through R4 and R5.

The signal passing through SW2, on the other hand, is pulled high on the R side of the RS flip-flop (where S is low by R3) and outputs low to output Q.

This low signal turns on the timer circuit BLK8. Even when SW2 is released, VCC is held together while the timer is operating, and the B side of the multiplexer BLK3 is selected. On the other hand, the current of the rechargeable battery pack distributed to R8 is inputted to B of the multiplexer through the A / D converter (BLK6) for current through the contact of relay 2 and inputs the digitally configured current value of 4 bits or 8 bits. Is displayed.

Referring to the operation of the display value holding driver 180, the display value holding driver is composed of a clock generator and a timer circuit. This part is another configuration example of the device according to the present invention, except that the configuration can display the current only while the second switch SW2 is pressed, and the configuration including this part is the second switch SW2. You can also display the preset amount of time by pressing and releasing.

When the VCC is supplied, the clock generator BLK7 starts oscillation, and a clock, which is its output, is applied to the input side of the timer circuit RLK8. At this time, the output Q of the RS flip-flop outputs a low by SW2, and this low signal acts as a control input of the timer circuit BLK8 to turn on the timer to output a high signal and to set a predetermined time (for example, about 1 minute). This high signal continues to turn on TR1 through diodes D3 and D2, and the output Q of the RS flip-flop remains low.

When a predetermined time (for example, about one minute) has elapsed, the output of the timer circuit BLK8 goes low, turns off TR1 to cut off VCC, and stops the display.

Therefore, when SW2 is pressed and released artificially, VCC is applied to the display control circuit, and the current of the rechargeable battery pack passing through the relay 2 can be displayed only while the timer is operating.

5 is a circuit diagram of a charging voltage display circuit according to the present invention. A charging voltage display circuit according to the present invention will be described with reference to FIG. 5 as follows.

This is a driving device suitable for the case where it is fixed in one place without being detached and attached to a charger like a rechargeable battery pack for a vehicle, and a large capacity is not a problem for the display element and the control circuit driving required according to the present invention. A display device suitable for lead-acid batteries among rechargeable batteries capable of passing a current of the battery. The controller is attached to a built-in or external type, and the voltage is displayed by operating the on / off switch SW1. By making it possible to implement a device that can easily check the state of charge of the rechargeable battery pack.

The rechargeable battery pack stacker 210, the power driver 220A, the voltage detector 230, the voltage display converting unit 260, and the display unit 270 are configured. To view the charging voltage of the rechargeable battery pack, turn on the SW1. At this time, a voltage divided between the R1 and the R2 through the D1 is applied to the base side of the TR1, and turns on the TR2. Therefore, the constant voltage passing through the constant voltage circuit BLK1 is applied to the VCC of all the control circuits and starts to operate. In addition, the voltage divided by R1 and R2 is applied to the base side of TR3, turns on TR4, converts to digital value through A / D converter (BLK5) for voltage divided by R4 and R5, and then converts and displays the voltage value. Display via (BLK4) (260). Therefore, when SW1 is pressed, VCC is applied and the charging voltage applied to the rechargeable battery pack is displayed. When checking the rechargeable battery pack in storage, you can measure the voltage of the rechargeable battery pack by pressing SW1.

Since the present invention can easily know the state of charge of the rechargeable battery or battery pack without a separate measuring device, it is possible to easily identify when to charge or full, and to efficiently manage the rechargeable battery or battery pack, The effect is to maximize the life of the rechargeable battery or battery pack.

Claims (1)

The first switch for controlling the voltage that is pressed by the weight of the battery pack stack and charged when connected to the charger, and the charging voltage transmitted through the diode under the control of the first switch operates the transistors TR1 and TR2. A power driver provided with a constant voltage circuit for supplying a required level of power to the inside of the apparatus; A third switch for controlling the output of the constant voltage circuit to operating power of internal circuit elements of the apparatus; Under the control of the first switch, the charging voltage supplied from the outside is interrupted and detected by the transistors TR3 and TR4, and the detected charging voltage is converted into a 4 or 8 bit digital signal by an A / D converter. A voltage detector; A current detector for detecting a current of the voltage charged in the battery pack stacking unit by a second relay and converting the detected charging current into a digital signal of 4 or 8 bits by an A / D converter; RS flip-flop for outputting two status signals according to the level of the charging supply voltage passing through the first switch and the level of whether the second switch is interrupted or the output of the voltage detector or the current detector A voltage and current selection unit having a multiplexer for outputting a signal; A display value converter for converting an output value of the voltage and current selector into a text or numeric signal; A counting display unit displaying the converted voltage and current values by letters or numbers; And a clock generator in which clock signal generation is initiated by an operating power supply of device internal circuit elements supplied by pressing a second switch for interrupting the current A / D converter, an output of the clock generator and an output from the RS flip-flop. A rechargeable battery bag for displaying a state of charge, comprising: a display device for maintaining a charge value comprising a timer circuit operating only for a predetermined time by means of a control signal, and a diode allowing the output of the timer circuit to pass in the forward direction.