KR101377321B1 - Battery pack and portable device selecting battery cells and Method of controlling charging/discharging using the same - Google Patents

Abstract

The present invention relates to a battery pack for a portable electronic device and a portable electronic device using the same, and more particularly, to a battery pack and a portable electronic device using the same to select and charge and discharge the battery cells provided inside the battery pack It is about. The present invention provides a battery cell 10 connected in parallel with two or more chargeable and discharged by a predetermined voltage; A connection switch 20 connected to each of the battery cells 10 in series; And a controller 50 that controls the number of battery cells 10 that are charged or discharged by controlling the connection switch 20. According to the present invention having the configuration as described above, even if a plurality of battery cells are connected in parallel to prevent deterioration due to impedance imbalance and path difference of the current, it is possible to individually control the short circuit and opening of each battery cell to the circuit It is possible to control the charge and discharge capacity of the battery according to the system situation and user requirements.

Battery Cell, Protection Circuit, Degradation, Taper Current

Description

Battery pack and portable device selecting battery cells and charging and discharging method, battery discharge control method and charging control method of battery {Battery pack and portable device selecting battery cells and Method of controlling charging / discharging using the same}

Figure 1a is a block diagram showing the configuration of a battery pack of a portable electronic device according to a specific embodiment of the present invention.

Figure 1b is a block diagram showing the configuration of a battery pack of a portable electronic device according to another embodiment of the present invention.

2A is an exemplary diagram showing a table showing the number of discharge battery cells according to the system load amount according to the first embodiment of the present invention.

Figure 2b is an exemplary view showing a table showing the number of charge battery cells according to the system usage time according to a second embodiment of the present invention.

3 is a flowchart illustrating a battery discharge control method according to a system load amount according to a first embodiment of the present invention step by step;

4 is a flowchart illustrating a method for controlling battery charge according to a system usage time setting according to a second embodiment of the present invention.

Description of the Related Art [0002]

10: battery cell 20: connection switch

30: current sensor 40: voltage sensor

50: controller 60: communication interface

70: charge / discharge switch 80: protection circuit

The present invention relates to a battery pack for a portable electronic device and a portable electronic device using the same, and more particularly, to a battery pack and a portable electronic device using the same to select and charge and discharge the battery cells provided inside the battery pack It is about.

Recently, as a variety of portable devices have appeared and are widely used, the importance of a battery for supplying power to a portable device is increasing day by day.

Accordingly, in addition to extending the operating time of the portable device by increasing the capacity of the battery, efforts for solving the problems for improving the function of the battery such as increasing the safety of use of the battery and accurate measurement of the residual capacity of the battery have been continued.

To this end, recently, a battery for a portable electronic device is manufactured in the form of a battery pack including several battery cells and various sensors and protection circuits for measuring the remaining battery capacity.

However, battery packs provided in existing portable electronic devices have been mostly connected to a single cell or two rows in parallel. This is because when three or more columns are connected in parallel, it is difficult to balance the impedance of each battery cell, and a path difference of current flowing through each parallel-connected battery cell occurs, causing degradation in some battery cells.

In the conventional battery pack, even if the battery cells are connected in parallel, the short circuit and the opening of each battery cell cannot be controlled individually.

The battery pack and the portable electronic device using the same according to the prior art have the following problems.

That is, since it is difficult to connect the battery cells in parallel in more than three rows, there is a problem that the life of the battery pack is not long.

In the prior art, the short-circuit and opening of each battery cell cannot be controlled individually, so that if an error occurs in one battery cell, the entire battery pack cannot be used. There was a problem that the number of cells can not be adjusted.

Accordingly, the present invention has been made to solve the above-mentioned conventional problems, an object of the present invention is to provide a battery pack that can prevent deterioration due to impedance imbalance and current path difference even when the battery cells are connected in parallel to three or more columns, It is to provide a portable electronic device using the same and a battery control method using the same.

Another object of the present invention is to provide a battery pack capable of selectively charging and discharging a battery cell and its number as necessary by individually controlling the short circuit and opening of each battery cell to a circuit, a portable electronic device using the same, and It is to provide a battery control method.

Still another object of the present invention is to provide a battery pack capable of controlling charge and discharge capacity of a battery according to a system situation of a portable electronic device and a user's request, a portable electronic device using the same, and a battery control method using the same.

According to a feature of the present invention for achieving the above object, the present invention comprises: two or more battery cells connected in parallel charge-dischargeable by a predetermined voltage; A connection switch connected to each of the battery cells in series; And a controller that controls charging or discharging of each of the battery cells by controlling the connection switch.

In this case, the battery pack may further include a communication interface for communication between a system controller and the controller.

The controller may receive the system load data from the system control unit and control the connection switch according to the system load to determine the number of discharge battery cells.

The controller may determine the number of rechargeable battery cells by receiving system usage time data from the system controller and controlling the connection switch according to the system usage time.

The battery pack further includes a current sensor and a voltage sensor provided for each battery cell to measure voltage and current of the battery cell; The controller may determine whether there is an abnormality of the battery cell with reference to current and voltage information of the battery cell received from the current sensor and the voltage sensor, and control off the connection switch connected to the battery cell in which the abnormality is detected. Can be.

In addition, the battery pack includes a current sensor and a voltage sensor provided for each of the battery cells connected in parallel to measure the voltage and current of the battery cell; A charge / discharge switch connected in series for each battery cell connected in parallel to control charge / discharge of the battery cell; And determining whether there is an abnormality of the battery cell by referring to current and voltage information of the battery cell received from the current sensor and the voltage sensor, and off-controlling the charge / discharge switch connected to the battery cell in which the abnormality is detected. It may further comprise a circuit.

The battery pack includes: a current sensor and a voltage sensor provided for each of the battery cells connected in parallel to measure voltage and current of the battery cell; A protection circuit for determining whether the battery cell is abnormal by referring to current and voltage information of the battery cell received from the current sensor and the voltage sensor; The controller may control the connection switch connected to the battery cell in which an abnormality is detected by communicating with the protection circuit, and the connection switch connected to the battery cell in which no abnormality is detected may be the number of the rechargeable battery cells or the discharge battery cell. It can also be controlled according to the number of.

On the other hand, the portable electronic device according to the present invention comprises: at least two battery cells connected in parallel to be charged and discharged by a predetermined voltage; A connection switch connected to each of the battery cells in series; And it may be configured to include a controller for controlling the charge or discharge of each of the battery cells by controlling the connection switch.

Wherein the controller determines the number of discharge battery cells in accordance with the system load; The connection switch may be controlled to connect the battery cells according to the number of discharge battery cells.

The controller may also determine the number of rechargeable battery cells according to system usage time; The connection switch may be controlled to connect the battery cells according to the number of the rechargeable battery cells.

On the other hand, the battery discharge control method according to the present invention is a portable electronic device that is powered by a battery pack comprising two or more battery cells connected in parallel and a connection switch connected in series for each battery cell, the system load is measured A measuring step; A determination step of determining the number of discharge battery cells according to the system load measured in the measuring step; A control step of controlling the connection switch according to the number of the discharge battery cells may include.

The battery discharge control method further includes a sensing step of detecting an abnormality of each battery cell; In the controlling step, the connection switch connected to the battery cell in which the abnormality is detected in the sensing step may be turned off, and the connection switch connected to the battery cell in which the abnormality is not detected may be controlled according to the number of discharge battery cells.

The battery discharge control method includes: detecting a remaining capacity of each battery cell; A comparison step of comparing the number of discharge cells with the number of battery cells whose residual capacity is greater than or equal to a reference value as a result of the detection in the detection step; The method may further include a terminating step of terminating the system when the number of battery cells whose residual capacity is greater than or equal to the reference value is less than the number of the discharge battery cells.

On the other hand, the sensing step, the detection step of detecting the voltage and current of each battery cell by the sensor; A comparison step of comparing the voltage and current values detected in the detection step with a reference whether they are within a normal range; And a transmitting step of transmitting a control signal for blocking the connection of the battery cell whose voltage or current value is outside the normal range according to the result of performing the comparing step.

On the other hand, the battery charging control method according to the present invention is a portable electronic device powered by a battery pack comprising at least two battery cells and a connection switch connected in series for each battery cell, the input step of receiving the system use time Wow; A determination step of determining the number of charging battery cells according to the system usage time input in the input step; A control step of controlling the connection switch according to the number of the charge battery cells may include.

The battery charging control method further includes a sensing step of detecting an abnormality of each battery cell; In the controlling step, the connection switch connected to the battery cell in which the abnormality is detected in the sensing step may be turned off, and the connection switch connected to the battery cell in which the abnormality is not detected may be controlled according to the number of the rechargeable battery cells.

On the other hand, the sensing step, the detection step of detecting the voltage and current of each battery cell by the sensor; A comparison step of comparing with the reference whether the voltage and current values detected in the detection step are within a normal range; And a transmitting step of transmitting a control signal for a battery cell whose voltage or current value is out of a normal range according to a result of performing the comparing step.

According to the present invention having the configuration as described above, even if the battery cells are connected in parallel three or more columns can be prevented deterioration due to the impedance imbalance and the current path difference, and the short circuit and opening of each battery cell to the circuit individually By controlling, the charge and discharge capacity of the battery can be controlled according to the system situation and user's request.

Hereinafter, a battery pack of a portable electronic device and a charge / discharge control method thereof according to the present invention as described above will be described in detail with reference to the accompanying drawings.

Figure 1a is a block diagram showing the configuration of a battery pack of a portable electronic device according to a specific embodiment of the present invention, Figure 1b is a block diagram showing the configuration of a battery pack of a portable electronic device according to another embodiment of the present invention, 2A is an exemplary view showing a table showing the number of discharge battery cells according to the system load according to the first embodiment of the present invention, Figure 2b is a rechargeable battery according to the system usage time according to a second embodiment of the present invention It is an exemplary figure which shows the table which shows the number of cells.

As illustrated in FIG. 1A, a battery pack of a portable electronic device according to a specific embodiment of the present invention includes a plurality of battery cells 10. The battery cells 10 are connected in parallel to each other. In this case, the battery cells 10 may be connected in parallel one by one, or two or more battery cells connected in series may be connected in parallel again.

In the following description, it is assumed that only one battery cell 10 is provided in one column of the battery cells 10 connected in parallel.

Here, the battery cell 10 is provided as a secondary battery cell capable of repeating charging and discharging, such as lithium ion or nickel hydrogen alloy.

Connection switches 20 are connected in series to the battery cells 10 connected in parallel. The connection switch 20 is connected in a current direction to the battery cell 10 to serve to flow or block current to the battery cell 10.

At this time, the connection switch 20 is provided with a circuit element such as a field effect transistor.

On the other hand, each of the battery cells 10 is provided with a current sensor (30). The current sensor may include various types of sensors, such as a current sensor resistor or a CT (current transformer) type current sensor.

The current sensor serves to detect a current value flowing through the battery cell 10.

A voltage sensor 40 may be provided at both ends of the battery cell 10. At this time, the voltage sensor 40 may be provided in parallel with the battery cell 10, the connection switch 20 and the current sensor 30 connected in series as shown, or may be provided as one, or the connection switch 20 And parallel to only the battery cell 10 except for the current sensor 30 may be provided as many as the number of the battery cell (10).

In this case, the current and voltage values of the battery cell 10 measured by the current sensor 30 and the voltage sensor 40 are transmitted to the controller 50. The controller 50 is a control means for controlling the on / off of the connection switch 20 connected to the battery cell 10, respectively.

The controller 50 determines whether there is an abnormality of the battery cell 10 with reference to the current value and the voltage value of each of the battery cells 10 received from the current sensor 30 and the voltage sensor 40. do.

That is, when the current value or the voltage value of the battery cell 10 received from the current sensor 30 and the voltage sensor 40 is out of the reference range, the controller 50 may store the battery cell 10. Determining that an abnormality has occurred, the connection switch 20 connected to the battery cell 10 whose current value or voltage value is out of the reference range is turned off.

In this case, the reference is a current in which the battery cell 10 operates normally in consideration of measured values such as the characteristics of the battery cell 10, the maximum continuous discharge current, the maximum pulse discharge current, the characteristics of the circuit, and the amount of current required for the system. Refers to a voltage range in which the battery cell 10 operates normally determined in consideration of a range and a nominal voltage or a rated voltage provided by the battery cell 10.

The reference is determined through several measurements and stored in advance in the storage means provided in the controller 50 or the battery pack.

The controller 50 calculates the remaining capacity of the battery cell 10 by using the value received from the current sensor 30 or the voltage sensor 40. According to the calculation result, the battery cell 10 having low residual capacity cuts off the connection from the circuit by turning off the connection switch 20. In particular, in the case of the battery cell 10 whose voltage value is lower than the blocking voltage, the connection is cut off so that a certain amount or more of capacity remains in the battery cell 10.

In this case, the blocking voltage refers to the specific voltage value when the voltage of the battery cell decreases to reach a specific voltage value and the connection of the battery cell is cut off. This is to block the connection of the battery cells so that they are no longer discharged when the voltage of the battery cells decreases below a certain voltage value in order to prevent complete discharge of the battery cells.

Therefore, the controller 50 is connected to the battery cell 10 in which an abnormality occurs and the battery cell 10 whose voltage value is reduced below the cutoff voltage by the information received from the current sensor 30 and the voltage sensor 40. The battery cell 10 is protected by controlling the connection switch 20 off.

The controller 50 controls the connection switch 20 connected to the remaining battery cells 10 except for the battery cell 10 in which an error occurs and the battery cell 10 whose voltage value is reduced to less than the cutoff voltage. Connect cell 10 to the circuit.

In this case, the controller 50 may control the connection switch 20 to adjust the number of battery cells 10 that are connected to a circuit and charged or discharged. The controller 50 may select only one of the battery cells 10 to charge or discharge it, or connect all battery cells 10 to charge or discharge it.

Here, the controller 50 determines the number of the battery cells 10 to be charged or discharged, and adjusts the connection switch 20 to the number of the battery cells 10 to be charged or discharged according to a predetermined priority. Control on.

The priority may be in the order of high or low battery level. For example, when discharging the battery cell 10, the battery cell 10 is connected to discharge the battery cell 10 with a large residual capacity, and when the battery cell 10 is charged, from the battery cell 10 having a small residual capacity To charge. Also, if necessary, the above-listed priorities may be reversed.

The battery pack is provided with a communication interface 60 to receive information necessary for determining the number of the battery cells 10 to be charged or discharged by the controller 50.

When the battery pack is mounted on the portable electronic device, the communication interface 60 connects the central processing unit of the system of the portable electronic device and the controller 50 to communicate with each other.

That is, the controller 50 is connected to the central processing unit of the portable electronic device through the communication interface 60, receives the necessary information from the central processing unit, and transmits the information requested by the central processing unit. .

The information received by the central processing unit of the system of the portable electronic device may be system load data or system usage time data. Such data and a battery pack using the same will be described later in the first and second embodiments of the present invention.

On the other hand, as shown in Figure 1b, the battery pack according to another embodiment of the present invention, as in the specific embodiment of the present invention, a plurality of parallel connected battery cells 10, the connection switch 20, the current sensor ( 30), the voltage sensor 40, the controller 50 and the communication interface 60.

At this time, the battery cell 10, the connection switch 20, the current sensor 30, the voltage sensor 40, the controller 50 and the communication interface 60 are the same or similar in configuration and function. Therefore, the same reference numerals will be used.

However, unlike the specific embodiment of the present invention, the current and voltage values measured by the current sensor 30 and the voltage sensor 40 are received by the protection circuit 80 without being transmitted to the controller 50.

In addition, the protection circuit 80 determines whether there is an abnormality of the battery cell 10 according to the current and voltage values, and determines the remaining capacity. The protection circuit 80 disconnects the battery cell 10 in which an abnormality is detected and the battery cell 10 in which residual capacity is insufficient from the circuit. For this purpose, a charge / discharge switch 70 is provided in addition to the connection switch 20. Can be.

The protection circuit 80 and the charge and discharge switch 70 serves as the protection circuit 80 and the charge and discharge switch 70 provided in the battery pack of the prior art, but is provided separately for each battery cell 10 There is a difference in that.

Accordingly, the controller 50 receives data from the portable electronic device, controls the connection switch 20 on / off according to the received data value, and the protection circuit 80 controls the current sensor 30. And receiving data from the voltage sensor 40, to control the charge and discharge switch 70 on / off according to the received value.

In this case, the data received by the controller 50 from the portable electronic device through the communication interface 60 and the battery pack using the same are also described in the first and second embodiments of the present invention.

In addition, the charge / discharge switch 70 is not separately provided, and the protection circuit 80 and the controller 50 may communicate with each other to control only the connection switch 20 on / off.

On the other hand, the portable electronic device according to another embodiment of the present invention is provided with a plurality of parallel connected battery cells 10 and connection switches 20 connected in series to the battery cells 10 and the connection switch 20 It is configured to include a control means for controlling the battery cell 10 to be charged or discharged by controlling.

However, since the rest of the configuration is the same as the portable electronic apparatus according to the prior art, it will continue to refer to Figs. 1A and 1B.

At this time, the control means may be a controller 50 provided in the battery pack as described in the specific embodiments and other embodiments of the present invention, or may be a central processing unit of the portable electronic device.

That is, the portable electronic device may be designed to directly control the connection switch 20 connected to the battery cell 10 in the central processing unit.

Meanwhile, according to the first embodiment of the present invention, system load data is received from the central processing unit of the portable electronic device in the communication interface 60.

At this time, the first embodiment of the present invention can be implemented in both a specific embodiment of the present invention and another embodiment, a battery pack or a portable electronic device according to another embodiment, but taking a battery pack according to a specific embodiment of the present invention as an example It demonstrates with reference to FIG. 1A.

The controller 50 determines the number of battery cells 10 to be discharged according to the system load data.

That is, when the system load of the portable electronic device increases and power of a larger capacity must be supplied from the battery cell 10 at a moment, the central processing unit grasps the needs of the system and the communication interface 60. System load information is transmitted to the controller 50 through.

In this case, when the CPU executes various operation execution commands, the CPU may predict a system load in advance and transmit the estimated system load data to the controller 50.

The controller 50 receives the number of the battery cells 10 to be discharged according to the received system load data, and connects the connection switches 20 as many as the number.

In this case, the central processing unit may transmit the system load data as described above, but may calculate the number of battery cells to be discharged in advance according to the system load and transmit it to the controller 50.

Here, the system load refers to a power capacity required for performing a normal operation of the portable electronic device, and the system load increases when several operations are simultaneously performed on the portable electronic device.

In addition, when the system load of the portable electronic device is increased and the battery capacity is less than the required power supply capacity, a voltage drop occurs momentarily, so that the controller 50 transmits the system from the central processing unit. The number of battery cells 10 to be connected is adjusted according to the load amount.

In other words, when the load of the system is small, it is more stable to supply power only from the battery cells 10 in a single row or two rows, so that only one or two connection switches 20 are used, and the load of the system is large. If the necessary power capacity is not supplied, it is impossible to perform a smooth operation of the system and a voltage drop occurs, thereby supplying power from three or more columns of battery cells 10.

As described above, the number of battery cells 10 discharged according to the load of the system is previously stored in the storage means and used as information for controlling the battery pack, which is in the form of a data table as shown in FIG. 2A. Can be stored.

For example, if the load of the system is 50mA or less, the voltage drop does not occur even when only one battery cell 10 is connected and discharged.

However, when an operation execution command is additionally input to the system, the central processing unit anticipates the system load, and transmits the expected system load to the controller 50 in advance, and when the system load is expected to be 70 mA or more, the controller 50 does not detect an abnormality among the connection switches 20 connected to the battery cells 10, and turns on the connection switches 20 of three battery cells 10 having sufficient remaining capacity of the battery cells 10. The control is performed to discharge three battery cells 10 at the same time.

Meanwhile, according to the second embodiment of the present invention, the controller 50 may receive system usage time data from the central processing unit through the communication interface 60. In this case, the system use time refers to a setting time when a user sets a time to use the portable electronic device.

The second embodiment of the present invention can also be implemented by both a battery pack and a portable electronic device according to a specific embodiment, another embodiment and another embodiment of the present invention, but the case of the battery pack according to a specific embodiment of the present invention An example will be described with reference to FIG. 1A.

That is, the user may input a system use time desired by the user in the portable electronic device to adjust the use time and the charging time of the portable electronic device. The CPU receives the input and transfers it to the controller 50.

The controller 50 receiving the system usage time data determines the number of battery cells 10 to be charged according to the system usage time. Alternatively, the CPU may transmit the data about the number of battery cells 10 to be charged to the controller 50 by predetermined determination.

The controller 50 controls the connection switch 20 according to the number of battery cells 10 to be charged. That is, the battery cell 10 is charged with power having a capacity capable of using the portable electronic device for a desired use time by on-controlling the connection switch 20 by the number of battery cells 10 to be charged. .

At this time, the number of battery cells 10 to be charged can be calculated using the average value of the power consumption capacity according to the use time of the portable electronic device, and measured and calculated in advance to the required power capacity or use time according to the use time The number of battery cells 10 capable of providing the required power capacity is stored in the battery pack or the storage means of the portable electronic device.

As described above, the number of battery cells charged according to the usage time of the system is previously stored in the storage means and used as information for controlling the battery pack, which is stored in the form of a data table as shown in FIG. 2B. Can be.

When the user inputs the system usage time desired by the user to the portable electronic device at the time of charging the portable electronic device, the central processing unit transmits it to the controller 50, and the controller 50 sends the No abnormality is detected among the battery cells 10, and the connection switch 20 of one battery cell 10 having sufficient remaining capacity of the battery cell 10 is controlled on, thereby charging only one battery cell 10. .

When the charging of one connected battery cell 10 is completed, the current sensor 30 connected to the charged battery cell 10 detects a taper current value, and the voltage sensor 40 charges Since the voltage value close to the limit voltage (Over voltage limit) is detected, it is determined that the charging is completed through the detection of such a value, so that the charging is completed through the portable electronic device or the charger of the portable electronic device.

At this time, the battery pack for determining the number of battery cells 10 to be charged according to the system usage time according to the second embodiment of the present invention is a system using only one battery cell 10 or a unit of battery cells 10 connected in series It is assumed that the load can be met.

3 is a flowchart illustrating a battery discharge control method according to a system load amount according to a first embodiment of the present invention. FIG. 4 is a battery charge control according to a system usage time setting according to a second embodiment of the present invention. A flow chart showing the method step by step.

As shown in FIG. 3, the method for controlling battery discharge according to the first embodiment of the present invention starts from measuring a system load in the central processing unit of the portable electronic device (S100).

The system load measured in step 100 is used as a reference for determining the number of battery cells to be discharged in the central processing unit or the controller 50 separately provided in the battery pack (S110).

That is, when the system load increases, the CPU or the controller 50 determines the number of battery cells 10 such that the number of battery cells 10 to be discharged increases accordingly.

On the other hand, the step of measuring the presence or absence of each battery cell 10 and the remaining capacity of the battery cell 10 by the information from the various sensors in the battery pack is performed (S120).

In this case, step 120 may be performed before step 100 and step 110 or may be performed simultaneously.

In the 120th step, the various sensors may be the current sensor 30, the voltage sensor 40, and the temperature sensor as described in detail with reference to FIGS. 1A and 1B. Can be.

The battery cell 10 measures the voltage value, the current value, and the temperature of the battery cells 10 from the various sensors, and if any one of the voltage value, current value, or temperature is out of the reference range, the battery cell 10 It is excluded in determining the battery cells 10 to be connected according to the number of battery cells 10 to be discharged.

At this time, the reference is as described in the specific embodiment of the present invention.

In addition, by determining the remaining capacity of the battery cell 10 through the voltage value, current value, temperature, etc. of the battery cells 10 measured from the various sensors, the battery cell 10 having a residual capacity of less than the reference value is also discharged It is excluded in determining the battery cells 10 to be connected according to the number of battery cells 10 to be connected.

Here, whether the residual capacity is less than the reference value may be determined by various methods, but in general, it is determined whether the voltage is less than the cutoff voltage, which is the same as in a specific embodiment of the present invention.

The step of determining whether the number of remaining battery cells 10 except the battery cells 10 whose abnormality is detected or the residual capacity is less than the reference value is greater than or equal to the number of battery cells 10 to be discharged as determined in step 110 is described above. It is performed (S130).

That is, if the number of battery cells 10 to be discharged determined according to the system load is greater than the number of battery cells 10 that can be operated normally, the normal power supply to the system is impossible, and thus the determination is made.

In addition, if it is determined that the number of battery cells 10 to be discharged in step 130 is greater than the number of battery cells 10, in which no abnormality is detected and the remaining battery capacity is sufficient, the portable electronic device cannot be smoothly supplied to the system. The CPU of the system converts the system mode to the sleep mode or terminates the system (S150).

However, if no abnormality is detected than the number of battery cells 10 to be discharged in step 130 and the number of battery cells 10 with sufficient battery remaining capacity is determined to be greater, the controller 10 or the central processing unit remains. The connection switch 20 connected to the battery cells 10 as many as the number of battery cells 10 to be discharged as determined in step 110 is connected in the order of the battery cells 10 having a large capacity (S140).

Then, the following steps are repeated from step 100 again.

On the other hand, the battery charge control method according to a second embodiment of the present invention, as shown in Figure 4, starts from the step of receiving a system use time from the user (S200).

The controller 50 or the central processing unit determines the number of battery cells 10 to be charged according to the system usage time received in step 200 (S210).

On the other hand, in step 220, a step of determining whether there is an abnormality of each of the battery cells 10 is performed. In this case, in order to determine whether there is an abnormality of the battery cell 10, information from various sensors is referred to, and the various sensors may be the current sensor 20, the voltage sensor 30, and a temperature sensor.

In addition, the battery cell 10 detected as abnormal in step 200 is excluded from the battery cell 10 to be charged.

The number of battery cells 10 to be charged in step 210 of the remaining battery cells 10 except for the battery cell 10 in which an abnormality is detected in step 220 is connected to the battery cells 10. The battery cell 10 is charged by connecting the connection switch 20 (S230).

At this time, the battery cells 10 to be charged by connecting the connection switch 20 may be determined by a predetermined priority, which is in order of the battery cells 10 having the largest residual capacity in order to perform the charging quickly. It can be done but can be reversed if necessary.

If it is determined in step 230 that all of the connected battery cells are charged, the remaining battery cells are connected or charged (S240).

The rights of the present invention are not limited to the embodiments described above, but are defined by the claims, and those skilled in the art can make various modifications and adaptations within the scope of the claims. It is self-evident.

In the battery pack, the portable electronic device, and the battery charge / discharge control method using the same according to the present invention as described in detail above, the following effects can be expected.

That is, by detecting an abnormality for each battery cell, it is possible to block only the connection of the battery cell in which an abnormality is detected, so that the battery cells can be connected in parallel by three or more rows, thereby extending the use time of the battery.

In the battery pack, the portable electronic device, and the battery charge / discharge control method using the same, the number of battery cells discharged according to the system load can be reduced or increased. There is an advantage in that the deterioration of the battery cells can be prevented by connecting only the battery cells.

On the other hand, when the system load is large, connecting a plurality of battery cells to supply the necessary power capacity to prevent the voltage drop in the system during overload, and at the same time whether the battery cells are abnormal due to the connection of three or more battery cells. There is an advantage that the battery cell can be protected by detecting and blocking the connection of the battery cell in which an abnormality occurs before the battery cell is damaged.

In addition, in the battery pack, the portable electronic device and the battery charge / discharge control method using the same according to the present invention, the number of battery cells charged according to the system usage time can be adjusted, so that the user charges the battery by inputting the usage time before going out. In this case, since the battery is charged only as much as the power capacity required by the user, there is an advantage that it is possible to prevent a case where the charging time is exceeded or the battery is insufficiently charged.

In addition, the battery pack, the portable electronic device, and the battery charge / discharge control method using the same according to the present invention can control each battery cell individually, and thus there is an advantage that the remaining battery cells can be used even when an abnormality occurs in one battery cell. .

In addition, the battery pack, the portable electronic device and the battery charge / discharge control method using the same according to the present invention, by separately measuring the abnormality, such as current, voltage, etc. to each battery cell can be prevented from deteriorating the battery cell. There is an advantage.

Claims (17)

Two or more battery cells that can be charged and discharged in parallel by a predetermined voltage connection switch connected in series to each of the battery cells A controller for controlling the charge or discharge of each battery cell by controlling the connection switch and And a communication interface for communication between a system controller and the controller. The controller receives the system usage time data from the system control unit and controls the connection switch according to the system usage time to determine the number of rechargeable battery cells. delete delete delete The method according to claim 1, The battery pack, A current sensor and a voltage sensor provided for each battery cell to measure voltage and current of the battery cell; The controller comprising: And determining whether the battery cell is abnormal by referring to current and voltage information of the battery cell received from the current sensor and the voltage sensor, and controlling the connection switch connected to the battery cell in which the abnormality is detected. Battery pack. The method according to claim 1, The battery pack, A current sensor and a voltage sensor provided for each battery cell connected in parallel to measure the voltage and current of the battery cell; A charge / discharge switch connected in series for each battery cell connected in parallel to control charge / discharge of the battery cell; And The protection circuit determines whether there is an abnormality of the battery cell by referring to the current and voltage information of the battery cell received from the current sensor and the voltage sensor and controls the charge / discharge switch connected to the battery cell in which an abnormality is detected. Battery pack, characterized in that further comprises a. The method according to claim 1, The battery pack, A current sensor and a voltage sensor provided for each battery cell connected in parallel to measure the voltage and current of the battery cell; A protection circuit for determining whether the battery cell is abnormal by referring to current and voltage information of the battery cell received from the current sensor and the voltage sensor; The controller comprising: The connection switch connected to the battery cell in which an abnormality is detected in communication with the protection circuit is controlled off, and the connection switch connected to the battery cell in which no abnormality is detected is dependent on the number of the rechargeable battery cells or the number of the discharge battery cells. Battery pack, characterized in that the control box. Two or more battery cells connected in parallel with charge / discharge by a predetermined voltage. A connection switch connected in series to each of the battery cells. It comprises a controller for controlling the charge or discharge of each of the battery cells by controlling the connection switch , The controller determines a number of rechargeable battery cells according to a system usage time, and controls the connection switch to connect the battery cells according to the number of the charged battery cells. delete delete A measurement step of measuring a system load and a system load measured in the measurement step in a portable electronic device powered by a battery pack including two or more battery cells connected in parallel and a connection switch connected in series for each battery cell A determination step of determining the number of discharge battery cells according to the control and a control step of controlling the connection switch according to the number of discharge battery cells ; A detection step of detecting a residual capacity of each battery cell; A comparison step of comparing the number of discharge cells with the number of battery cells whose residual capacity is greater than or equal to a reference value as a result of the detection in the detection step; And And a terminating step of terminating the system if the number of battery cells having a residual capacity equal to or greater than a reference value is less than the number of discharge battery cells as a result of performing the comparing step. 12. The method of claim 11, The battery discharge control method, A sensing step of detecting an abnormality of each battery cell; Wherein the control step comprises: And the connection switch connected to the battery cell in which the abnormality is detected in the sensing step is turned off, and the connection switch connected to the battery cell in which the abnormality is not detected is controlled according to the number of discharge battery cells. delete 13. The method of claim 12, The detecting step, A detection step of detecting a voltage and a current of each battery cell by a sensor; A comparison step of comparing the voltage and current values detected in the detection step with a reference whether they are within a normal range; And And a transmitting step of transmitting a control signal for blocking the connection of the battery cells whose voltage or current value is out of the normal range according to the result of performing the comparing step. In a portable electronic device powered by a battery pack comprising two or more battery cells and a connection switch connected in series for each battery cell, An input step of receiving a system use time; A determination step of determining the number of charging battery cells according to the system usage time input in the input step; And controlling the connection switch according to the number of the rechargeable battery cells. 16. The method of claim 15, The battery charge control method, A sensing step of detecting an abnormality of each battery cell; Wherein the control step comprises: And the connection switch connected to the battery cell in which the abnormality is detected in the detecting step is turned off, and the connection switch connected to the battery cell in which the abnormality is not detected is controlled according to the number of the rechargeable battery cells. 17. The method of claim 16, The detecting step, A detection step of detecting a voltage and a current of each battery cell by a sensor; A comparison step of comparing the voltage and current values detected in the detection step with a reference whether they are within a normal range; And And a transmitting step of transmitting a control signal for a battery cell whose voltage or current value is out of a normal range according to a result of performing the comparing step.

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