KR100812209B1 - Battery device with self-diagnosis function and control method thereof - Google Patents

Abstract

The present invention relates to a battery device including a rechargeable battery pack, and a power cut-off unit that cuts off power when the battery pack is overloaded, comprising: a data interface externally connectable; A battery state sensing unit sensing a state of the battery pack and a state of the power cutoff unit, including a capacity sensing unit sensing a charging capacity when the battery pack is charged; A control unit for outputting state data of the battery state detection unit through the interface; The state data is characterized in that it comprises a reduced charge capacity in comparison with the charge capacity of the battery pack when the charge capacity of the battery pack detected from the capacity detection unit. As a result, it is possible to provide a battery device having a self-diagnostic function of self-diagnosing failure and displaying a state of a battery to a user.

Description

Battery device with self-diagnosis function and control method {BATTERY APPARATUS WITH SELF-DIAGNOSIS AND CONTROL METHOD THEREOF}

1 is a circuit diagram of a battery device mounted on a portable electronic device;

2 is a control block diagram of a battery device according to the present invention;

3 is an example of data coded according to whether or not a battery device according to the present invention is defective;

* Explanation of symbols for the main parts of the drawings

 1: Battery Pack 3: Fuse

 5: FET 9: controller

11: LED 20: control part

22: FET detector 24: fuse detector

26: overcharge detection unit 28: overcharge counter

30: exaggeration detection unit 32: over discharge counter

34: battery cell detection unit 36: capacity detection unit

38 memory 40 data interface

The present invention relates to a battery device having a self-diagnostic function, which can display a state of a battery device to a user by self-diagnosing a failure.

Currently, a smart battery is mainly used as a battery device used in portable computer devices such as notebook PCs, PDAs, and handheld PCs.

Smart batteries have a microcontroller inside the battery to provide various information about the battery to portable electronic devices that use the battery. The information provided by the smart battery is data for power management of the electronic device, such as manufacturer information and remaining capacity information of the battery. Electronic devices equipped with smart batteries use this function to display the remaining battery capacity and perform the corresponding operation of the power management system suitable for the remaining battery information.

In the event of an abnormality in the smart battery, it is necessary to determine whether it is defective by diagnosing the state of the battery using a separate device for battery inspection. Therefore, in case of suspecting a battery abnormality, the user is inconvenient to check whether the battery has to be broken only by requesting a review from a battery manufacturer such as an A / S center.

Accordingly, it is an object of the present invention to provide a battery device capable of self-diagnosis of failure.

According to the present invention, there is provided a battery device including a rechargeable battery pack and a power cut-off unit for shutting off power when the battery pack is overloaded, comprising: a data interface capable of external connection; A battery state sensing unit sensing a state of the battery pack and a state of the power cutoff unit; It is achieved by a battery device having a self-diagnostic function, characterized in that it comprises a control unit for outputting the state data of the battery state detection unit through the data interface.

Here, the battery state detection unit includes a battery cell detection unit for detecting the charge and discharge voltage of the battery cell which is the minimum unit for charging and discharging the battery pack, the control unit of the battery cell detected through the battery cell detection unit It is desirable to provide data on the charge and discharge voltage to the outside through the data interface to diagnose the battery cell failure.

The battery state detecting unit may include a capacity detecting unit detecting a charging capacity when the battery pack is charged, and the controller is configured to initially charge the charging capacity of the battery pack detected from the capacity detecting unit during charging. It is desirable to calculate the reduced charging capacity in comparison with the charging capacity of the city and to provide the reduced charging capacity to the outside through the data interface to determine whether the battery is replaced.

In addition, the power cut-off unit for cutting off power when the battery pack is overloaded, includes a fuse; The battery state detecting unit includes a fuse detecting unit detecting whether the fuse is short-circuited; The control unit may provide data on the state of the fuse detected through the fuse detector to the outside through the data interface.

The power cut-off unit which cuts off the power when the battery pack is overloaded includes a FET; The battery state detecting unit includes a FET detecting unit detecting whether the FET is defective through voltages across the FET; The control unit may provide data on the state of the FET sensed through the FET detector to the outside through the data interface.

The battery state detecting unit includes an overcharge detecting unit detecting whether the battery pack is overcharged or not; The controller may provide accurate information on the state of the battery by providing the number of overcharges detected by the overcharge detection unit to the outside through the data interface.

The battery state detecting unit may include an over discharge detecting unit detecting whether the battery pack is over discharged; The controller may provide the number of over-discharges detected by the over-discharge detection unit to the outside through the data interface.

On the other hand, according to another aspect of the present invention, in a control method of a battery device including a rechargeable battery pack and a power cut-off unit for shutting off power when the battery pack is overloaded, the state of the battery pack and the power Detecting a state of the blocking unit; Storing the sensed state data; It is also achieved by a control method of a battery device comprising the step of outputting and displaying the state data to the outside.

Comparing the detected state data to determine whether an error state is present; If it is determined that the error state, it is preferable to further include a predetermined warning to warn the user of the battery failure.                     

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

1 is a schematic circuit diagram of a battery device mounted in a portable electronic device. As shown, the battery device includes a battery pack 1 in which power is charged, a FET 5 and a fuse 3, which are protection circuits to prevent the device from being damaged due to an overload. And a controller 9 for detecting a state and providing information about the battery to an electronic device equipped with the battery device, and an LED 11 for notifying the user of the battery abnormality.

The fuse 3 is short-circuited when the battery pack 1 is overloaded to cut off the power supplied to the battery pack 1, thereby preventing damage to the battery pack 1.

The controller 9 senses the state of the battery with a plurality of detectors, and if it is determined that the battery is in an overdischarge state or an overcharge state, the FET 5 is turned off to supply power and the battery pack 1 to the battery pack 1. Interrupt the power supply discharged from). In addition, when it is determined that the battery is in an abnormal state, the controller 9 blinks the LED 11 to warn the user that the battery is abnormal.

2 is a control block diagram of a battery device having a self-diagnostic function according to the present invention. As shown in the drawings, a battery device having a self-diagnosis function according to the present invention includes a battery pack 1 consisting of one unit cell in which power is charged and discharged, a FET detecting unit 22, and a fuse detecting unit ( 24), overcharge detection unit 26, overcharge counter 28, overdischarge detection unit 30, overdischarge counter 32, battery cell detection unit 34, and capacity detection unit 36 The control unit 20 flashes the LEDs 11 according to the memory 38 for data storage and the detection values from the plurality of sensing units, and provides the information stored in the memory 38 through the data interface 40. Include.

The FET detecting unit 22 periodically turns off the FET 5 and checks the voltage at both ends of the FET 5 so as to sense the state of the FET 5 so that the control unit 20 detects the state of the FET 5. Provide information on defects.

The fuse detector 24 periodically detects the voltage across the fuse 3 to detect whether the fuse 3 is shorted.

The overcharge detecting unit 26 monitors the voltage of the battery pack 1 to check whether the battery pack 1 is in an overcharge state. In general, when the voltage of the battery pack 1 is more than 4.3V, it is determined that the battery is in an overcharge state. When the battery pack 1 is determined to be overcharged as a result of the detection of the overcharge detecting unit 26, the overcharge counter 28 counts the number of times. Increase by '1', and the control unit 20 cuts off the power supplied to the battery pack 1 by turning off the FET 5 according to the detection result of the overcharge detecting unit 26.

The over discharge detecting unit 30 monitors the voltage of the battery pack 1 to check whether the battery pack 1 is in an over discharge state. When the voltage of the battery pack 1 is 2.5V or less, it is determined that the battery pack 1 is in an over-discharge state, and when it is determined that the battery pack is in an over-discharge state, the over-discharge counter 32 counts the number of times of '1'. 'Increasingly, according to the detection result of the over-discharge detection unit 30, the control unit 20 turns off the FET (5) to stop the discharge of the battery pack (1).

The battery cell detector 34 detects states of unit cells in which power is charged and discharged. The battery cell detector 34 detects a voltage between the battery cells. When the voltage difference between the battery cells is 200 mV or more, it is determined that the voltage difference between the battery cells is excessive and the cell unbalance signal is transmitted to the controller 20. Apply. In addition, when the voltage across the battery cell is sensed and the voltage across the battery cell is 500 mV or less, it is determined that the battery cell cannot perform the charge / discharge function, and a dead cell signal is applied to the controller 20. .

The capacity detector 36 detects the capacity of the battery pack 1 that changes each time it is charged. As charge and discharge batteries are repeatedly charged and discharged, the battery cells capable of being charged and discharged are reduced due to chemical phenomena, thereby reducing the total battery capacity. In addition, the battery repeats the capacity learning to reset the reference capacity to provide the remaining battery capacity to the external device during the discharge of the battery, the battery capacity may be reduced due to the error occurring during the capacity learning. The capacity detecting unit 36 detects a decrease in capacity of the battery, and the control unit 20 converts the current capacity of the battery pack 1 in preparation for the initial capacity of the battery pack 1. The controller 20 determines that the battery needs to be replaced when the current capacity of the battery pack 1 is less than 60% of the initial capacity.

The control unit 20 stores the number of overcharges and overdischarges detected by the overcharge counter 28 and the overdischarge counter 32 in the memory 38, and the battery device stores the number of overcharges and overdischarges stored in the memory 38. By providing the mounted electronic device, the state of the battery device can be communicated in more detail.

In addition, if it is determined that the battery device is in an abnormal state based on the state of the battery device detected through each sensing unit, the LED 11 blinks to warn the user of an abnormal battery device, and if the display device is connected, the controller ( 20 shows accurate information on which part of the battery device is abnormal to the external device through the data interface 40.

In this case, the means for displaying the information may be a display unit such as a screen of a computer equipped with a battery device, a jig, an LED, or the like, so that the user may accurately determine the error state of the battery without using a diagnostic apparatus. have.

Meanwhile, the information about the state of the battery device may be coded into a predetermined digital code, stored in the memory 38, and provided through the data interface 40. 3 shows an example of data coded according to whether a battery is defective. As shown in the battery failure display table shown in FIG. 3, data may be coded in 8 bits according to an abnormal cause of the battery device. According to the type of the cause of the failure of the battery device by assigning 1 bit by 1 and 0 to indicate the cause of the failure of the battery device. For example, if the sixth bit is 1 such as 00100000, it indicates that the fuse 3 is shorted. In addition, if 00100110 is displayed, it means that the fuse 3 of the battery is short-circuited, many dead cells are impossible to charge and discharge, and the total capacity of the battery is reduced.

Therefore, the failure factor of the battery device may be digitally coded and a plurality of LEDs 11 may be mounted on the battery device to indicate whether or not the battery is defective.

As described above, the present invention includes a plurality of detection units capable of detecting a cause of failure of the battery device, and the battery device diagnoses each part by itself to warn the user of a failure state of the battery device, By displaying the to the user, it is possible to easily determine the cause of the failure of the battery device.

As described above, according to the present invention, there is provided a battery device having a self-diagnostic function capable of self-diagnosing failure and displaying the state of the battery to the user.

Claims (10)

A battery device comprising a rechargeable battery pack and a power cut-off unit which cuts off power when the battery pack is overloaded. An externally connectable data interface; A battery state sensing unit sensing a state of the battery pack and a state of the power cutoff unit, including a capacity sensing unit sensing a charging capacity when the battery pack is charged; A control unit for outputting state data of the battery state detection unit through the interface; The state data is a battery device having a self-diagnostic function, characterized in that the charge capacity of the battery pack detected from the capacity detection unit compared to the charge capacity at the time of initial charge of the battery pack includes a reduced charge capacity . The method of claim 1, And the controller outputs state data of the battery state detection unit through the data interface when a data request signal is input through the data interface. The method of claim 1, The battery state detection unit includes a battery cell detection unit for detecting the charge and discharge voltage of the battery cell which is the minimum unit for charging and discharging the battery pack, And the state data includes a charge and discharge voltage of the battery cell detected through the battery cell detector. delete The method of claim 1, A power cut-off unit which cuts off power when the battery pack is overloaded, includes a fuse; The battery state detecting unit includes a fuse detecting unit detecting whether the fuse is short-circuited; The status data includes a battery device having a self-diagnosis function, characterized in that it comprises a short circuit of the fuse detected through the fuse detector. The method of claim 1, A power cut-off unit which cuts off power when the battery pack is overloaded, includes a FET; The battery state detecting unit includes a FET detecting unit detecting whether the FET is defective through voltages across the FET; The state data is a battery device having a self-diagnostic function, characterized in that including the data on the state of the FET sensed through the sensing unit of the FET. The method of claim 1, The battery state detecting unit includes an overcharge detecting unit detecting whether the battery pack is overcharged or not; The control unit is a battery device having a self-diagnostic function, characterized in that for providing the number of overcharges detected by the overcharge detection unit to the outside through the data interface. The method of claim 1, The battery state detecting unit includes an over discharge detecting unit detecting whether the battery pack is over discharged; The control unit is a battery device having a self-diagnostic function, characterized in that for providing the over-discharge frequency detected by the over-discharge detection unit to the outside through the data interface. In the control method of the battery device including a rechargeable battery pack and a power cut-off unit for shutting off the power when the battery pack is overloaded, Calculating a reduced charging capacity by comparing the charging capacity of the battery pack with the charging capacity at the time of initial charging of the battery pack; Storing the calculated reduced charge capacity as state data; And outputting and displaying the status data to the outside. The method of claim 9, Comparing the detected state data to determine whether an error state is present; And displaying a warning on the outside when it is determined that the error state is present.

Images