JP2009278743A - Charge control circuit, method of controlling charge control circuit, secondary battery, and electrical apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a charge control circuit that charges a secondary battery composed of at least one battery cell more reliably. <P>SOLUTION: The charge control circuit includes: a charging circuit 10 that applies direct-current charging voltage to a secondary battery 3 composed of at least one battery cell 31i; a detection unit 32 that detects at least either of the voltage value and temperature of each battery cell 31i of the secondary battery to which direct-current charging voltage is applied by the charging circuit 10; and a first control element FET that is connected in series with the charging current path in the charging circuit 10 through which direct-current charging voltage is applied to the secondary battery 3 and controls the voltage value of the direct-current charging voltage according to the result of detection by the detection unit 32. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention includes a charge control circuit for charging a secondary battery composed of at least one battery cell, a control method thereof, a secondary battery corresponding to the charge control circuit, and the charge control circuit and the secondary battery. It relates to electrical equipment.

  In Patent Document 1, when a commercial power source is available, the battery is charged while supplying power from the commercial power source to the load, and when the commercial power source is not available, the power supply system is switched to supply power from the battery to the load. Describes a power supply system having a topology that reduces the number of switch elements.

  In addition, in a charge control circuit for charging a secondary battery such as a lithium ion secondary battery including the above-described power supply system, each battery cell is charged in order to reliably charge a secondary battery composed of at least one battery cell. On the other hand, it is necessary to apply an appropriate charging voltage.

JP 2007-306647 A

  The present invention has been proposed in view of such a situation, and a charge control circuit that enables more reliable charging of a secondary battery composed of at least one battery cell, its control method, and this It is an object of the present invention to provide a secondary battery corresponding to a charge control circuit, and an electric device including the charge control circuit and the secondary battery.

  As means for solving the above-described problems, a charge control circuit according to the present invention includes a charging circuit that applies a DC charging voltage to a secondary battery including at least one battery cell, and the DC charging voltage is applied by the charging circuit. A detection unit that detects at least one of a voltage value and a temperature with respect to the battery cell of the secondary battery, and a detection unit that is connected in series to a charging current path that applies a DC charging voltage to the secondary battery in the charging circuit. And a first control element that controls the voltage value of the DC charging voltage in accordance with the detection result of.

  The charging control circuit control method according to the present invention includes a step of applying a DC charging voltage to a secondary battery including at least one battery cell by the charging circuit, and a secondary in which the DC charging voltage is applied by the charging circuit. A step of detecting at least one of a voltage value and a temperature for a battery cell of the battery, and a first control element connected in series to a charging current path for applying a DC charging voltage to the secondary battery in the charging circuit. And a step of controlling the voltage value of the DC charging voltage according to the detected result.

  Further, the secondary battery according to the present invention includes one or more battery cells, a detection unit that detects at least one of the charging voltage value and the temperature with respect to the battery cells, and a detection result by the detection unit, respectively. The charging circuit that controls the DC charging voltage applied to the battery cell includes an output unit that outputs a detection result of the detection unit.

  Further, an electric device according to the present invention includes a secondary battery including at least one battery cell, a charging circuit that applies a DC charging voltage to the secondary battery, and a secondary battery to which the DC charging voltage is applied by the charging circuit. The battery cell is connected in series to a detection unit that detects at least one of a voltage value and a temperature, and a charging current path that applies a DC charging voltage to the secondary battery in the charging circuit, depending on the detection result by the detection unit The first control element that controls the voltage value of the DC charging voltage and the secondary battery and the first control element are connected in series via the charging current path, and according to the detection result by the detection unit A second control element for controlling a voltage value of a DC charging voltage applied to the secondary battery, the first control element having a rectifying element connected in parallel in the forward direction of the charging current path, 2 control elements are charged A rectifying element connected in parallel in the opposite direction of the current path, connected to the load end via a connection point between the first control element and the second control element, and a DC power supply voltage or a secondary battery at the load end Supply the power supply voltage.

  The present invention applies a DC charging voltage to a secondary battery composed of at least one battery cell by a charging circuit, and the voltage value and temperature for the battery cell of the secondary battery to which the DC charging voltage is applied by the charging circuit. Voltage value of the DC charging voltage according to the detected result by the first control element connected in series to the charging current path for detecting at least one of the charging circuit and applying the DC charging voltage to the secondary battery in the charging circuit Therefore, an appropriate charging voltage can be applied to the secondary battery according to the state during the charging operation of the battery cell, and as a result, the secondary battery can be charged more reliably.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.

  As an example of a charging control circuit to which the present invention is applied, first, a mode for carrying out the present invention will be described using a charging device 1 as shown in FIG.

<Charging device>
As shown in FIG. 1, the charging device 1 is a circuit that charges the secondary battery 3 by being driven by a power supply from a DC power supply device 2.

  The DC power supply 2 is supplied with an AC power supply such as a commercial power supply, boosts the supplied AC power supply voltage, converts it to a DC power supply voltage, and supplies the DC power supply voltage to the charging device 1.

  The secondary battery 3 is, for example, a lithium ion secondary battery composed of at least one battery cell, and has a configuration as shown in FIG. That is, the secondary battery 3 includes n (n is a natural number) battery cells 311 to 31 n and a control unit 32 that performs control related to the secondary battery 3.

  Note that the secondary battery 3 is not limited to the above-described lithium ion secondary battery as long as it is desired to be charged so as not to be in an overvoltage state. .

  The control unit 32 includes a voltage detection unit 321 that detects a voltage value of each battery cell 31i (i is an integer from 1 to n), a temperature detection unit 322 that detects the temperature of each battery cell 31i, and a voltage detection unit. 321 and the temperature detection part 322 are provided with the output part 323 which outputs the detection result detected to the charging device 1. FIG.

  In order to charge the secondary battery 3 having the above configuration, the charging device 1 has the following configuration. That is, the charging device 1 includes a charging circuit 10 that applies a DC charging voltage to the secondary battery 3, a field effect transistor FET that is connected in series to the charging current path of the charging circuit 10, and a DC power supply voltage from the DC power supply device 2. And a charge control unit 12 that controls the operation of the field effect transistor FET. In addition, the charging device 1 includes a control processing unit 13 that controls the charging control unit 12 according to the detection result output from the output unit 323 of the secondary battery 3.

  The charging circuit 10 connects the DC power supply device 2 and the secondary battery 3 in series, and receives the power supply from the DC power supply device 2 to charge the secondary battery 3. That is, the charging circuit 10 is driven by the DC power supply voltage supplied from the DC power supply device 2 and applies the DC charging voltage to the secondary battery 3 through the charging current path.

  In the field effect transistor FET, the gate terminal is connected to the charge control unit 12, the source terminal and the drain terminal are connected to the charging current path, and the gate voltage is controlled by the charge control unit 12 to be described later to drop between the source and drain. The voltage value to be controlled is controlled.

  The voltage detection unit 11 detects the DC power supply voltage supplied from the DC power supply device 2 and outputs the detection result to the charge control unit 12.

  The charge control unit 12 controls the gate voltage of the field effect transistor FET according to a control signal from the control processing unit 13 described later. That is, the charge control unit 12 adjusts the gate voltage of the field effect transistor FET, and adjusts the voltage value to be dropped with respect to the DC charging voltage between the source and drain of the field effect transistor FET, thereby changing the charging current path. The DC charging voltage value applied to the secondary battery 3 is controlled.

  In addition, the charging control unit 12 reduces the DC charging voltage applied to the secondary battery 3 when the DC power supply voltage detected by the voltage detection unit 11 exceeds a predetermined threshold value. Increase the voltage dropped between the drains.

  The control processing unit 13 receives the detection result output from the output unit 323 of the secondary battery 3 described above, and supplies, for example, the following control signal to the charging control unit 12 according to the input detection result. .

  That is, the control processing unit 13 determines that the voltage value of any one of the battery cells 31i among the voltage values of the respective battery cells 311 to 31n detected by the voltage detection unit 321 of the secondary battery 3 is greater than a predetermined voltage value. When it is determined that the battery cell 31i is in an overvoltage state. At this time, the control processing unit 13 outputs a control signal for adjusting the gate voltage of the field effect transistor FET to the charge control unit 12.

  In addition, the control processing unit 13 has the temperature of any one of the battery cells 311 to 31n detected by the temperature detection unit 322 of the secondary battery 3 is higher than a predetermined temperature. The battery cell 31i is determined to be in an overvoltage state. At this time, the control processing unit 13 outputs a control signal for adjusting the gate voltage of the field effect transistor FET to the charge control unit 12.

  The control processing unit 13 determines whether or not each battery cell 31i is in an overvoltage state by using at least one detection result among the voltage value and temperature of each of the battery cells 31i described above. A control signal corresponding to the above may be output to the charging control unit 12.

  In the charging device 1 configured as described above, the detection result obtained by detecting at least one of the voltage value and the temperature is detected for each battery cell 31i of the secondary battery 3 to which the DC charging voltage is applied by the charging circuit 10. Accordingly, the voltage value of the DC charging voltage is controlled by the field effect transistor FET. Therefore, in the charging device 1, an appropriate charging voltage can be applied according to the state during the charging operation of each battery cell 31i constituting the secondary battery 3, and as a result, for example, the battery cell 31i is in an overvoltage state. Therefore, the secondary battery 3 can be reliably charged.

  Further, the control processing unit 13 detects both the voltage value and the temperature of each battery cell 31i described above, and determines whether the battery cell 31i is in an overvoltage state according to the temperature of each battery cell 31i. The threshold value of the voltage value may be set to be arbitrarily changeable. In particular, the control processing unit 13 can determine whether or not it is in the overvoltage state according to the temperature characteristic of the battery cell by setting the threshold value of the voltage value for determining the overvoltage state in accordance with the temperature in this manner. The secondary battery 3 can be charged even more reliably.

  Further, the detection of the voltage value and temperature of each battery cell 31i in the secondary battery 3 may not be detected. For example, in the charging device 4 as shown in FIG. You may make it detect the voltage value and temperature of each battery cell 5i which comprise the secondary battery 5. FIG.

  The charging device 4 detects a DC power supply voltage from the DC power supply device 2, a charging circuit 10 for applying a DC charging voltage to the secondary battery 5, a field effect transistor FET connected in series to the charging current path of the charging circuit 10 And a charge control unit 12 that controls the operation of the field effect transistor FET. In addition, since the structure which concerns on the charging circuit 10, field effect transistor FET, the voltage detection part 11, and the charging control part 12 is the same as that of said charging device 1, the description is abbreviate | omitted.

  In addition, the charging device 4 includes a control processing unit 40 that detects the voltage value and temperature of each battery cell 5 i constituting the secondary battery 5 and controls the charging control unit 12 according to the detection result.

  The control processing unit 40 includes a voltage detection unit 41 that detects the voltage value of each battery cell 5i that constitutes the secondary battery 5 to be charged, a temperature detection unit 42 that detects the temperature of each battery cell 5i, and a detection A determination unit 43 that determines the result is provided.

  The voltage detection unit 41 is connected to each battery cell 5 i of the charging device 4 through a detection line, detects the voltage value of each battery cell 5 i during charging, and outputs the detection result to the determination unit 43.

  The temperature detection unit 42 includes, for example, a thermocouple to detect the temperature of each battery cell 5i of the charging device 4, and a determination unit that determines temperature information of the battery cell 5i detected via each thermocouple. Output to 43.

  The determination unit 43 determines whether or not each battery cell 5i is in an overvoltage state from the detection results of the voltage detection unit 41 and the temperature detection unit 42, and reduces the DC charging voltage based on the determination result. Is supplied to the charging control unit 12.

  The charging device 4 and the secondary battery 5 corresponding to the charging device 4 do not have a function of detecting information related to each battery cell 5i in the secondary battery 5 although the number of terminals for connecting to each other increases. The secondary battery 5 can be downsized.

<Electronic equipment>
A charging device according to another embodiment to which the present invention is applied is incorporated into a main body of a portable electric device such as a video camera or a small computer, in addition to the charging devices 1 and 4 described above. Below, with reference to FIG. 4, the power supply control is demonstrated in detail about the structure of the electric equipment 100 which receives the power supply from the DC power supply device 2 or the secondary battery 3 and operates.

  As illustrated in FIG. 4, the electric device 100 includes a power supply unit 110 and a load unit 120 that realizes various functions of the electric device 100. Note that the electric device 100 may be integrally formed with the secondary battery 3 detachably. Similarly, the electric device 100 may be integrally formed even if it is detachably connected to the DC power supply device 2.

  The power supply unit 110 performs a charging process for charging the secondary battery 3 in the same manner as the charging devices 1 and 4 described above, and also performs a process for supplying the power supply voltage of the DC power supply device 2 or the secondary battery 3 to the load unit 120. . The power supply unit 110 also instantaneously shuts off when the power supply source to the load unit 120 is switched from the DC power supply device 2 to the secondary battery 3 or vice versa while the load unit 120 is operating. Supply power without any problems.

  In order to realize the functions as described above, the power supply unit 110 has the following configuration. That is, the power supply unit 110 includes a charge / discharge circuit 130 that supplies power to the load unit 120 by the secondary battery 3 or the DC power supply device 2, and a field effect transistor FET1 that is connected in series to the charge current path of the charge / discharge circuit 130. The FET 2 includes a voltage detection unit 131 that detects a DC power supply voltage from the DC power supply device 2 and a charge / discharge control unit 132 that controls the operation of the field effect transistors FET1 and FET2. In addition, the power supply unit 110 includes a control processing unit 140 that controls the charge / discharge control unit 132 according to the detection result output from the output unit 323 of the secondary battery 3.

  The charge / discharge circuit 130 connects the DC power supply device 2 and the secondary battery 3 in series, and receives power supply from the DC power supply device 2 to charge the secondary battery 3. The charge / discharge circuit 130 supplies power to the load unit 120 from the DC power supply device 2 or the charged secondary battery 3 by controlling the field effect transistors FET1 and FET2 by the charge / discharge control unit 132 described later.

  The field effect transistor FET1 has a gate terminal connected to the charge / discharge control unit 132, a source terminal and a drain terminal connected in series to the charge / discharge circuit 130, and a gate voltage controlled by the charge / discharge control unit 132 described later. The voltage value ΔV1 dropping between the drains is controlled. Further, the field effect transistor FET1 has a rectifying element D1 connected in parallel in the forward direction of the charging current path flowing through the charging / discharging circuit 130 during charging.

  The field effect transistor FET2 has a gate terminal connected to the charge / discharge control unit 132, and a source terminal and a drain terminal connected in series between the secondary battery 3 and the field effect transistor FET1 in the charge / discharge circuit 130. In the field effect transistor FET2, the gate voltage is controlled by a charge / discharge control unit 132, which will be described later, and the voltage value ΔV2 that drops between the source and drain is controlled. Further, the field effect transistor FET2 has a rectifying element D2 connected in parallel in the reverse direction of the charging current path flowing through the charging / discharging circuit 130 during charging.

  Further, the charge / discharge circuit 130 is connected to the load unit 120 via a connection point P between the field effect transistor FET1 and the field effect transistor FET2.

  The voltage detection unit 131 detects the DC power supply voltage supplied from the DC power supply device 2 and outputs the detection result to the charge / discharge control unit 132.

  The charge / discharge control unit 132 controls the gate voltages of the field effect transistors FET1 and FET2 according to a control signal from the control processing unit 140 described later. In other words, the charge / discharge control unit 132 adjusts the gate voltages of the field effect transistors FET1 and FET2, and adjusts the voltage values ΔV1 and ΔV2 that drop between the source and drain of the field effect transistors FET1 and FET2, thereby charging. The DC charging voltage value applied to the secondary battery 3 is controlled via the current path. Further, at the time of supplying power to the load unit 120, the charge / discharge control unit 132 adjusts the gate voltage of each of the field effect transistors FET1 and FET2, and drops between the source and drain of the field effect transistors FET1 and FET2. By adjusting the values ΔV 1 and ΔV 2, power is supplied to the load unit 120 from the DC power supply device 2 or the charged secondary battery 3.

  Further, the charging / discharging control unit 132 is configured to apply a DC charging voltage to the secondary battery 3 when the DC power supply voltage detected by the voltage detection unit 131 exceeds a predetermined threshold, or supply power to the load unit 120. In order to lower the voltage, the voltage value dropped between the source and drain of the field effect transistors FET1 and FET2 is increased.

  When the secondary battery 3 is charged, the control processing unit 140 receives the detection result output from the output unit 323 of the secondary battery 3 described above, and performs, for example, the following control according to the input detection result. The signal is supplied to the charge / discharge control unit 132.

  That is, the control processing unit 140 determines that the voltage value of any one of the battery cells 31i among the voltage values of the respective battery cells 311 to 31n detected by the voltage detection unit 321 of the secondary battery 3 is greater than a predetermined voltage value. When it is determined that the battery cell 31i is in an overvoltage state. At this time, the control processing unit 140 outputs a control signal for adjusting the voltage values ΔV1 and ΔV2 that drop between the source and drain of the field effect transistors FET1 and FET2 to the charge control unit 12.

  In addition, the control processing unit 140 has the temperature of any one of the battery cells 311 to 31n detected by the temperature detection unit 322 of the secondary battery 3 being higher than a predetermined temperature. The battery cell 31i is determined to be in an overvoltage state. At this time, the control processing unit 140 outputs a control signal for adjusting the voltage values ΔV1 and ΔV2 that drop between the source and drain of the field effect transistors FET1 and FET2 to the charge / discharge control unit 132.

  In particular, in the charging / discharging circuit 130, unlike the charging circuit 10 described above, the charging current path is electrically connected via the rectifying element D1 even when the field effect transistor FET1 is turned off. Therefore, the control processing unit 140 outputs the control signal for performing control to turn the field effect transistor FET1 off and the field effect transistor FET2 on, thereby switching the FET element to the on state or the off state. Thus, the DC charging voltage applied to the secondary battery 3 can be easily reduced.

  In the power supply unit 110, in addition to controlling the charging of the secondary battery 3 as described above, the control processing unit 140 controls the power supply to the load unit 120 according to the following states. .

  As a first state, it is assumed that only the DC power supply device 2 is connected to the electric device 100 among the DC power supply device 2 and the secondary battery 3. At this time, the control processing unit 140 supplies a control signal for controlling the field effect transistor FET1 to be turned on and the field effect transistor FET2 to be turned off in order to supply the power supply voltage from the DC power supply device 2 to the load unit 120. Output to the discharge controller 132.

  As the second state, it is assumed that the secondary battery 3 is connected from the state in which only the DC power supply device 2 is connected to the electric device 100 among the DC power supply device 2 and the secondary battery 3. At this time, the control processing unit 140 performs control so that the field effect transistor FET1 is kept on and the field effect transistor FET2 is kept off. That is, the control processing unit 140 supplies the DC power supply voltage from the DC power supply device 2 to the load unit 120 without charging the secondary battery 3.

  As a third state, it is assumed that only the secondary battery 3 is electrically connected to the electric device 100 among the DC power supply device 2 and the secondary battery 3. At this time, the control processing unit 140 supplies a control signal for controlling the field effect transistor FET1 to be turned off and the field effect transistor FET2 to be turned on in order to supply the power supply voltage from the secondary battery 3 to the load unit 120. Output to the discharge controller 132.

  As a fourth state, it is assumed that the DC power supply device 2 is connected from the state where only the secondary battery 3 is connected to the electric device 100 among the DC power supply device 2 and the secondary battery 3. At this time, the control processing unit 140 controls to switch from the state where the field effect transistor FET1 is turned off and the field effect transistor FET2 is turned on to the state where the field effect transistor FET1 is turned on and the field effect transistor FET2 is turned off. To do. The reason for performing such switching processing is to suppress power consumption of the secondary battery 3 and supply power from the DC power supply device 2 to the load unit 120. In the charge / discharge circuit 130, even if such a switching process is performed, a current flows from one of the rectifying elements D <b> 1 and D <b> 2 to the load unit 120 via the connection point P. Power can be supplied without any problem.

  As a fifth state, it is assumed that the DC power supply device 2 is disconnected from a state in which the DC power supply device 2 and the secondary battery 3 are both connected to the electric device 100. At this time, the control processing unit 140 controls to switch from the state where the field effect transistor FET1 is turned on and the field effect transistor FET2 is turned off to the state where the field effect transistor FET1 is turned off and the field effect transistor FET2 is turned on. To do. In the charge / discharge circuit 130, even if such a switching process is performed, a current flows from either one of the rectifying elements D1 and D2 to the load unit 120 via the connection point P. Supply can be made.

  As a sixth state, it is assumed that the secondary battery 3 is disconnected from the state where both the DC power supply device 2 and the secondary battery 3 are connected to the electric device 100. At this time, the control processing unit 140 performs control so as to maintain a state in which the field effect transistor FET1 is turned on and the field effect transistor FET2 is turned off.

  Thus, in the power supply unit 110, even if the power supply source to the load unit 120 is switched, a current flows from one of the rectifying elements D1 and D2 to the load unit 120 via the connection point P. Power can be supplied to the load unit 120 without doing so.

  Further, even when both of the two field effect transistors FET1 and FET2 are turned off due to the influence of noise or the like, the power supply unit 110 supplies power to the load unit 120 via one of the rectifying elements D1 and D2. It can be carried out.

  As described above, in the power supply unit 110, the DC charging voltage can be easily controlled during the charging operation of the secondary battery 3 by connecting the rectifying elements D1 and D2 to the charging / discharging circuit 130, and the load unit When power is supplied to 120, it is possible to prevent instantaneous interruption of power supply due to switching of the power supply source. In other words, the power supply unit 110 can easily perform direct current charging during the charging operation of the secondary battery 3 in order to prevent instantaneous power supply interruption due to switching of the power supply source during power supply to the load unit 120. It can also be used as a circuit configuration for controlling the voltage, and as a result, an increase in circuit scale can be suppressed.

  In addition, the electric device 100 described above receives the voltage value and temperature of each battery cell 31i detected in the secondary battery 3 and controls the value of the DC charging voltage. However, the electric device 100 of the electric device 200 illustrated in FIG. As described above, the voltage value and the temperature of each battery cell 5 i constituting the secondary battery 5 to be charged may be detected in the electric device 200.

  The electric device 200 includes a power supply unit 210 and a load unit 120. The power supply unit 210 includes a charge / discharge circuit 130 that supplies power from the secondary battery 5 or the DC power supply device 2, field effect transistors FET1 and FET2 connected in series to the charge current path of the charge / discharge circuit 130, and a DC power supply device. 2 includes a voltage detection unit 131 that detects a DC power supply voltage from 2 and a charge / discharge control unit 132 that controls the operation of the field effect transistors FET1 and FET2. Description of the charge / discharge circuit 130, the field effect transistors FET1, FET2, the voltage detection unit 131, and the charge / discharge control unit 132 is omitted. In addition, the power supply unit 210 includes a control processing unit 240 that detects the voltage value and temperature of each battery cell 5 i constituting the secondary battery 5 and controls the charge / discharge control unit 132 according to the detection result.

  The control processing unit 240 includes a voltage detection unit 241 that detects a voltage value of each battery cell 5i that constitutes the secondary battery 5 to be charged, a temperature detection unit 242 that detects a temperature of each battery cell 5i, and a detection A determination unit 243 for determining the result is provided.

  The voltage detection unit 241 is connected to each battery cell 5i through a detection line, detects the voltage value of each battery cell 5i during charging, and outputs the voltage value to the determination unit 243.

  The temperature detection unit 242 has a thermocouple for detecting the temperature of each battery cell 5 i, and outputs temperature information of the battery cell 5 i detected via each thermocouple to the determination unit 243.

  The determination unit 243 determines whether or not each battery cell 5i is in an overvoltage state from the detection results of the voltage detection unit 241 and the temperature detection unit 242, and reduces the DC charging voltage based on the determination result. A control signal is supplied to the charge / discharge control unit 132.

  Although the electrical device 200 and the secondary battery 5 corresponding to the electrical device 200 increase the number of terminals to be connected to each other, the secondary battery 5 does not have a function of detecting information related to each battery cell 5i. The secondary battery 5 can be downsized.

  In addition, this invention is not limited only to the above embodiment, Of course, a various change is possible in the range which does not deviate from the summary of this invention.

It is a figure which shows the structure of the charging device to which this invention was applied. It is a figure which shows the structure of the secondary battery which has a some battery cell. It is a figure which shows the structure of the charging device to which this invention was applied. It is a figure which shows the structure of the electric equipment incorporating the charge control circuit to which this invention was applied. It is a figure which shows the structure of the electric equipment incorporating the charge control circuit to which this invention was applied.

Explanation of symbols

  1, 4 charging device, 2 DC power supply device, 3, 5 secondary battery, 311 to 31n, 51 to 5n battery cell, 32 control unit, 323 output unit, 10 charging circuit, 11, 41, 131, 241, 321 voltage Detection unit, 12 Charge control unit, 13, 40, 140, 240 Control processing unit, 42, 242, 322 Temperature detection unit, 43, 243 Judgment unit, 100, 200 Electrical equipment, 110, 210 Power supply unit, 120 Load unit, 130 Charge / Discharge Circuit, 132 Charge / Discharge Control Unit, FET, FET1, FET2 Field Effect Transistor, D1, D2 Rectifier

Claims (6)

A charging circuit for applying a DC charging voltage to a secondary battery comprising at least one battery cell;
A detection unit that detects at least one of a voltage value and a temperature for a battery cell of a secondary battery to which a DC charging voltage is applied by the charging circuit;
A first control element connected in series to a charging current path for applying a DC charging voltage to the secondary battery in the charging circuit, and controlling a voltage value of the DC charging voltage according to a detection result by the detection unit; A charge control circuit provided. A voltage value of a DC charging voltage applied to the secondary battery is connected in series between the secondary battery and the first control element in the charging current path, according to a detection result by the detection unit. A second control element for controlling,
The first control element has a rectifying element connected in parallel in the forward direction of the charging current path,
The second control element has a rectifying element connected in parallel in the reverse direction of the charging current path,
2. The load terminal is connected to a load end via a connection point between the first control element and the second control element, and the DC power source voltage or the power source voltage of the secondary battery is supplied to the load end. Charge control circuit.   The charge control circuit according to claim 2, wherein the first and second control elements are field effect transistors (FETs). Applying a DC charging voltage to a secondary battery comprising at least one battery cell by a charging circuit;
Detecting at least one of a voltage value and a temperature for a battery cell of a secondary battery to which a DC charging voltage is applied by the charging circuit;
A step of controlling a voltage value of the DC charging voltage according to the detected result by a first control element connected in series to a charging current path for applying a DC charging voltage to the secondary battery in the charging circuit; A control method for a charge control circuit comprising: One or more battery cells;
For the battery cell, a detection unit that detects at least one of a charging voltage value and a temperature;
A secondary battery comprising: a charging circuit that controls a DC charging voltage applied to the battery cell according to a detection result by the detection unit; and an output unit that outputs the detection result by the detection unit. A secondary battery comprising at least one battery cell;
A charging circuit for applying a DC charging voltage to the secondary battery;
A detection unit that detects at least one of a voltage value and a temperature for a battery cell of a secondary battery to which a DC charging voltage is applied by the charging circuit;
A first control element connected in series to a charging current path for applying a DC charging voltage to the secondary battery in the charging circuit, and controlling a voltage value of the DC charging voltage according to a detection result by the detection unit;
A voltage of a DC charging voltage that is connected in series between the secondary battery and the first control element via the charging current path and is applied to the secondary battery according to a detection result by the detection unit. A second control element for controlling the value,
The first control element has a rectifying element connected in parallel in the forward direction of the charging current path,
The second control element has a rectifying element connected in parallel in the reverse direction of the charging current path,
An electrical device connected to a load end via a connection point between the first control element and the second control element, and supplying the DC power supply voltage or the power supply voltage of the secondary battery to the load end.

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