USRE41915E1 - Charge/discharge control circuit and secondary battery - Google Patents
Charge/discharge control circuit and secondary battery Download PDFInfo
- Publication number
- USRE41915E1 USRE41915E1 US10/854,781 US85478104A USRE41915E US RE41915 E1 USRE41915 E1 US RE41915E1 US 85478104 A US85478104 A US 85478104A US RE41915 E USRE41915 E US RE41915E
- Authority
- US
- United States
- Prior art keywords
- charge
- control switch
- circuit
- voltage
- charging
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0016—Circuits for equalisation of charge between batteries using shunting, discharge or bypass circuits
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00302—Overcharge protection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00304—Overcurrent protection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00306—Overdischarge protection
Definitions
- the present invention relates to a charge/discharge control circuit, and more particularly, to a charge/discharge control circuit of a secondary battery used in a portable electronic device.
- Lithium ion batteries which are commonly used as secondary batteries, are widely used in recent portable electronic devices.
- charging and discharging of the battery has to be controlled. During discharge control, discharging is prohibited when the battery is overdischarged. During charge control, charging is prohibited when the battery is overcharged.
- FIG. 1 is a schematic circuit diagram of a prior art charge/discharge control circuit 50 .
- the charge/discharge control circuit 50 includes a control unit 3 and two control switches that are externally connected to the control unit 3 .
- the two control switches are a discharge control switch 4 and a charge control switch 5 a.
- the charge/discharge control circuit 50 controls the charge/discharge control current of a battery 1 .
- the battery 1 is a lithium ion battery that can be used as a secondary battery, and includes three series-connected cells 2 a, 2 b, 2 c.
- the battery 1 provides power to a portable electronic device, for instance.
- the discharge control switch 4 and the charge control switch 5 a each include a p-channel MOS transistor. Each p-channel MOS transistor includes a parasitic diode formed between its source and drain. The drain of the discharge control switch 4 is connected to the drain of the charge control switch 5 a.
- the positive terminal of the battery 1 is connected to an output terminal t 1 via the control switches 4 , 5 a.
- the negative terminal of the battery 1 is connected to the ground GND and an output terminal t 2 .
- the charge control switch 5 a is controlled based on a charge control signal Cout of the control unit 3 .
- the discharge control switch 4 is controlled based on a discharge control signal Dout of the control unit 3 .
- the cells 2 a, 2 b, 2 c of the battery 1 are each connected to a cell voltage detection circuit 6 incorporated in the control unit 3 .
- the cell voltage detection circuit 6 includes three comparators 7 a, 7 b, 7 c.
- the comparator 7 a detects voltage V 2 a between terminal BH and terminal BM.
- the comparator 7 b detects voltage V 2 b between terminal BM and terminal BL.
- the comparator 7 c detects voltage V 2 c between terminal BL and the GND terminal.
- the output signals of the comparators 7 a, 7 b, 7 c are each provided to positive input terminals of an overcharge detection circuit 8 and to negative input terminals of an overdischarge detection circuit 9 .
- a charge reference voltage VTH is provided to a negative input terminal of the overcharge detection circuit 8 .
- a discharge reference voltage VTL is provided to a positive input terminal of the overdischarge detection circuit 9 .
- the overdischarge detection circuit 9 provides the discharge control signal Dout to the gate of the discharge control switch 4 .
- the overcharge detection circuit 8 provides the charge control signal Cout to the gate of the charge control switch 5 a.
- the control unit 3 includes a bias generation circuit 10 .
- the control unit 3 is activated.
- a discharge route which includes the parasitic diode of the discharge control switch 5 a, the discharge control switch 4 , and the battery 1 , is formed between the output terminals t 1 , t 2 . Accordingly, if a portable electronic device is connected between the output terminals t 1 , t 2 , the battery 1 provides a current to the portable electronic device. This lowers each cell voltage.
- the parasitic diode of the discharge control switch 4 forms a charge route between the output terminals t 1 , t 2 . This enables charging. If a charger is then connected between the output terminals t 1 , t 2 and charges the battery 1 , which is in an overdischarged state, the cell voltages increase. This provides power to the portable electronic device.
- the charge/discharge control circuit 50 performs constant current charging.
- constant current charging is performed if the power supply voltage Vcc is low.
- Vcc becomes equal to a predetermined voltage (e.g., 12.6V)
- constant current charging is switched to constant voltage charging. This is because constant current charging charges the battery more quickly, since the charging current in constant current charging is greater than that in constant voltage charging.
- the charging voltage becomes low in comparison to normal constant current charging.
- the charging voltage of a typical charger is set at 12.6V.
- the charging voltage is controlled in accordance with the level of the power supply voltage Vcc.
- the power supply voltage Vcc is 9V.
- the charging voltage is significantly greater than the threshold voltage of the charge control switch 5 a, which is typically 4V.
- the power consumption of the charge control switch 5 a is 3 W and thus large.
- the charge control switch 5 a is heated when the battery 1 is charged in an overdischarged state, due to a large power consumption in the charge control switch 5 a.
- the present invention provides a charge/discharge control circuit for controlling charging and discharging of a secondary battery.
- the secondary battery includes a cell.
- the charge/discharge control circuit includes an overdischarge detection circuit for comparing a voltage of the cell with a predetermined discharge reference voltage, determining whether the secondary battery is in an overdischarged state, and generating an overdischarge determination signal.
- a discharge control switch is connected to the overdischarge detection circuit and deactivated in the overdischarged state based on the overdischarge determination signal.
- a first charge control switch is deactivated in the overdischarged state based on the overdischarge determination signal and the overcharge determination signal.
- a second charge control switch is activated in the overdischarged state based on the overdischarge determination signal and the overcharge determination signal.
- a current-limiting circuit is connected in series with the second charge control switch for limiting a charging current when charging is performed.
- the present invention also provides an alternative charge/discharge control circuit for controlling charging and discharging of a secondary battery.
- the secondary battery includes a cell.
- the charge/discharge control circuit includes an overdischarge detection circuit for comparing a voltage of the cell with a predetermined discharge reference voltage, determining whether the secondary battery is in an overdischarged state, and generating an overdischarge determination signal.
- a discharge control switch is connected to the overdischarge detection circuit and deactivated in the overdischarged state based on the overdischarge determination signal.
- a first charge control switch is deactivated in the overdischarged state based on the overdischarge determination signal and the overcharge determination signal.
- a second charge control switch is activated in the overdischarged state based on the overdischarge determination signal and the overcharge determination signal.
- a current-limiting circuit is connected in series with the second charge control switch for limiting a charging current when charging is performed. Furthermore, an erroneous functioning prevention circuit controls activation and deactivation of the first charge control switch in the overdischarged state based on a level of a voltage supplied by the secondary battery.
- the present invention further provides a secondary battery including a cell and a charge/discharge control circuit connected to the cell for controlling charging and discharging of the cell.
- the charge/discharge control circuit includes an overdischarge detection circuit for comparing a voltage of the cell with a predetermined discharge reference voltage, determining whether the secondary battery is in an overdischarged state, and generating an overdischarge determination signal.
- There is also an overdischarge detection circuit for comparing the voltage of the cell with a predetermined charge reference voltage, determining whether the secondary battery is in an overcharged state, and generating an overcharge determination signal.
- a discharge control switch is connected to the overdischarge detection circuit and deactivated in the overdischarged state based on the overdischarge determination signal.
- a first charge control switch is deactivated in the overdischarged state based on the overdischarge determination signal and the overcharge determination signal.
- a second charge control switch is activated in the overdischarged state based on the overdischarge determination signal and the overcharge determination signal.
- a current-limiting circuit is connected in series with the second charge control switch for limiting a charging current when charging is performed.
- FIG. 1 is a schematic circuit diagram of a prior art charge/discharge control circuit
- FIG. 2 is a schematic circuit diagram of a charge/discharge control circuit according to a first embodiment of the present invention
- FIG. 3 is a schematic circuit diagram of a charge/discharge control circuit according to a second embodiment of the present invention.
- FIG. 4 is a schematic circuit diagram of a charge/discharge control circuit according to a third embodiment of the present invention.
- FIG. 2 is a schematic circuit diagram of a charge/discharge control circuit 100 according to a first embodiment of the present invention.
- the charge/discharge control circuit 100 includes a control unit 30 , a discharge control switch 4 , and a first charge control switch 5 a.
- the discharge and charge control switches 4 , 5 a are connected to the control unit 30 .
- the control unit 30 further includes a cell voltage detection circuit 6 , an overcharge detection circuit 8 , and an overdischarge detection circuit 9 .
- the charge/discharge control circuit 100 further includes a second charge control switch 5 b, a resistor R, and an output circuit 20 .
- the output circuit 20 includes a first OR circuit 11 a, a second OR circuit 11 b, and an inverter 12 .
- the second charge control switch 5 b and the resistor R are connected in series.
- the first charge control switch 5 a is connected in parallel with the series-connected switch 5 b and resistor R.
- the resistor R is a current-limiting resistor.
- the second charge control switch 5 b is preferably a p-channel MOS transistor.
- a parasitic diode is formed between the source and drain of the second charge control switch 5 b.
- the cathode of the parasitic diode is connected to the source of the switch 5 b.
- Constant voltage charging is performed by the second discharge control switch 5 b.
- the voltage drop across the resistance R increases the charging voltage to a predetermined target charging voltage.
- the resistance of the resistor R is set such that the voltage drop across the resistor R is greater than the target charging voltage.
- the output signal of the overcharge detection circuit 8 is provided to first input terminals of the first and second OR circuits 11 a, 11 b respectively.
- the output signal (discharge control signal) Dout of the overdischarge detection circuit 9 is provided to the gate of the discharge control switch 4 and a second input terminal of the first OR circuit 11 a.
- the discharge control signal Dout is also provided to a second input terminal of the second OR circuit 11 b via the inverter 12 .
- the output signal (first charge control signal) Cout of the first OR circuit 11 a is provided to the gate of the first charge control switch 5 a.
- the output signal (second charge control signal) PreCout of the second OR circuit 11 b is provided to the gate of the second charge control switch 5 b. Accordingly, when the first charge control signal Dout is high and the output signal of the overcharge detection circuit 8 is low, the second charge control signal PreCout is low. In this state, the second charge control switch 5 b is activated.
- the cell voltage detection circuit 6 detects cell voltages V 2 a, V 2 b, V 2 c and provides the respective detection signals to the overcharge detection circuit 8 and the overdischarge detection circuit 9 .
- the output signal of the overcharge detection circuit 8 goes high.
- the overcharge detection circuit 8 provides the high output signal to the first and second OR circuits 11 a, 11 b. In this state, the discharge control signal Dout is low and the discharge control switch 4 is activated.
- the low discharge control signal Dout is also provided to first OR circuit 11 a and the inverter 12 .
- the inverter 12 inverts the discharge control signal Dout and provides a high signal Dout to the second OR circuit 11 b.
- the first and second charge control switches 5 a, 5 b are both deactivated. This prohibits charging.
- the battery 1 supplies the portable electronic device with a discharging current via the discharge control switch 4 and the parasitic diode of the charge control switch 5 a.
- the first charge control signal Cout generated by the first OR circuit 11 a also goes low and hence the first charge control switch 5 a is activated.
- the second charge control signal PreCout generated by the second OR circuit 11 b goes high and hence the second charge control switch 5 b is deactivated.
- the charger supplies the battery 1 with a charging current via the first charge control switch 5 a and the discharge control switch 4 so to perform constant current charging.
- the discharge reference voltage VTL is 2.5V and each of the cell voltages V 2 a, V 2 b, V 2 c is 3V
- the power supply voltage Vcc is 9V.
- the charging voltage for performing constant current charging in the normal state is about 10V, which is slightly higher than the power supply voltage.
- the threshold voltage of the first charge control switch 5 a is about 4V.
- the ON resistance of the first charge control switch 5 a is small. This low voltage between the source and drain of the first charge control switch 5 a reduces the power consumption of the first charge control switch 5 a. Thus, charging is performed without heating the first charge control switch 5 a.
- the target charging voltage is, for example, 12.6V
- constant current charging increases the battery voltage Vcc to the target charging voltage of 12.6V
- the constant current charging is switched to constant voltage charging.
- the discharge control signal Dout goes high. This high discharge control signal Dout deactivates the discharge control switch 4 , and prohibits discharging. Further, the first charge control signal Cout generated by the first OR circuit 11 a goes high and the first charge control switch 5 a is deactivated.
- the second charge control signal PreCout generated by the second OR circuit 11 a goes low and the second charge control switch 5 b is activated. In this state, a conductive route is formed between the output terminals t 1 , t 2 by way of the second charge control switch 5 b, the resistor R, the parasitic diode of the discharge control switch 4 , and the battery 1 .
- the battery 1 is charged when the charger is connected between the output terminals t 1 , t 2 .
- the charge/discharge circuit 100 if the battery voltage Vcc in the overdischarged state decreases to a value close to 0V and the charging voltage is low, a voltage drop occurs across the resistor R when a charging current flows through the second charge control switch 5 b. This immediately increases the charging voltage to the target charging voltage of 12.6V.
- the charge/discharge control circuit 100 performs constant voltage charging (12.6V) in the overdischarged state.
- the voltage between the source and gate of the second charge control switch 5 b is substantially equal to the target charging voltage of 12.6V and significantly higher than the threshold voltage of the second charge control switch 5 b, which is 4V.
- the ON resistance of the second charge control switch 5 b is small, and the voltage between the source and drain of the second charge control switch 5 b is small. This reduces the power consumption in the second charge control switch 5 b and enables charging to be performed without heating the second charge control switch 5 b.
- the charging increases the voltages of the cells from being in the overdischarged state until each of cell voltage V 2 a, V 2 b, V 2 c exceeds the discharge reference voltage VTL. This causes the output signals of the overcharge detection circuit 8 and the overdischarge detection circuit 9 to go low. As a result, the discharge control switch 4 and the first charge control switch 5 a are both activated and the second charge control switch 5 b is deactivated, so to perform constant current charging.
- the charge/discharge circuit 100 of the first embodiment has the advantages described as follows.
- FIG. 3 is a schematic circuit diagram of a charge/discharge control circuit 200 according to a second embodiment of the present invention.
- the charge/discharge control circuit 200 makes use some of the components in the charge/discharge control circuit 100 of the first embodiment, as identified by those labeled with identical numerals.
- the charge/discharge control circuit 200 further includes a control unit 30 A that differs from the control unit 30 in the charge/discharge control circuit 100 of the first embodiment.
- the control unit 30 A in the charge/discharge control circuit 200 includes an erroneous functioning prevention circuit 13 , which is connected to a bias generation circuit 10 , and an output circuit 20 A.
- the output circuit 20 A includes an OR circuit 11 c and an NOR circuit 15 , and is connected to the erroneous functioning prevention circuit 13 via an inverter 14 .
- the erroneous functioning prevention circuit 13 has a predetermined threshold voltage Vth 3 .
- the erroneous functioning prevention circuit 13 generates an erroneous functioning prevention signal (comparison signal).
- the erroneous functioning prevention signal goes high when any one of the cells 2 a, 2 b, 2 c is overdischarged and the power supply voltage (battery voltage) Vcc is higher than the threshold voltage Vth 3 .
- the erroneous functioning prevention signal goes low when the battery voltage Vcc is lower than the threshold voltage Vth 3 .
- the erroneous functioning prevention signal is provided to and further inverted by the inverter 14 .
- the inverted erroneous functioning prevention signal is provided to first input terminals of the OR circuit 11 c and the NOR circuit 15 in the output circuit 20 A.
- the first and second charge control switches 5 a, 5 b are controlled based on the erroneous functioning prevention signal.
- the output signal of the overcharge detection circuit 8 is provided to a second input terminal of the OR circuit 11 c.
- the output signal Dout of the overdischarge detection circuit 9 is provided to the discharge control switch 4 and a second input terminal of the NOR circuit 15 .
- the output signal (first charge control signal) Cout of the OR circuit 11 c is provided to the first charge control switch 5 a.
- the output signal (second charge control signal) PreCout of the NOR circuit 15 is provided to the second charge control switch 5 b.
- the erroneous functioning prevention circuit 13 provides the inverter 14 with a high erroneous functioning prevention signal.
- the inverter 14 inverts the high erroneous functioning signal and thereby causes the erroneous functioning signal to go low.
- the low erroneous functioning prevention signal is then provided to the OR circuit 11 c and the NOR circuit 15 .
- the output signal of the overcharge detection circuit 8 goes high, and the output signal Dout from the overdischarge detection circuit 9 goes low.
- the first charge control signal Cout provided by the OR circuit 11 c to the first charge control switch 5 a goes high
- the second charge control signal PreCout provided by the NOR circuit 15 to the second charge control switch 5 b goes high. This causes both of the first and second charge control switches 5 a, 5 b to be deactivated. In this state, the discharge control switch 4 is activated. Hence, charging is prohibited and discharging is performed.
- the erroneous functioning prevention signal output by the erroneous functioning prevention circuit 13 is high.
- the signals output by the overcharge detection circuit 8 and the overdischarge detection circuit 9 are both low.
- the discharge control switch 4 and the first discharge control switch 5 a are activated. Thus, discharging or charging (constant current charging) is performed.
- the signal output by the overcharge detection circuit 8 is low, and the signal output by the overdischarge detection circuit 9 is high.
- a high discharge control signal Dout deactivates the discharge control switch 4 . Hence, discharging is prohibited.
- the threshold voltage Vth 3 is set at 4V
- the discharge reference voltage VTL is set at 2.5V
- each of the cell voltages is 1V
- the power supply voltage Vcc is 3V. Since this power supply voltage (3V) is lower than the threshold voltage Vth 3 (4V), the erroneous functioning prevention signal generated by the erroneous functioning prevention circuit 13 is low. This low erroneous functioning prevention signal is provided to the inverter 14 .
- the inverter 14 inverts the low erroneous functioning signal and thereby causes the erroneous functioning prevention signal to go high.
- the high erroneous functioning prevention signal is then provided to the OR circuit 11 c and the NOR circuit 15 .
- the first charge control signal Cout generated by the OR circuit 11 c goes high
- the second charge control signal PreCout generated by the NOR circuit 15 goes low.
- only the second charge control switch 5 b is activated. Accordingly, charging is performed with a charging current flowing through the resistor R. Thus, constant voltage charging is performed.
- the threshold voltage Vth 3 is set at 4V
- the discharge reference voltage VTL is set at 2.5V
- each of the cell voltages is 2V
- the power supply voltage Vcc is 6V. Since this power supply voltage (6V) is higher than the threshold voltage Vth 3 (4V), the erroneous functioning prevention signal generated by the erroneous functioning prevention circuit 13 is high. The high erroneous functioning prevention signal is then provided to the inverter 14 . In this state, the first charge control signal Cout generated by the OR circuit 11 c and the second charge control signal PreCout generated by the NOR circuit 15 are both low. Hence, both of the first and second charge control switches 5 a, 5 b are activated.
- Charging in this state is performed with a charging current flowing through the first charge control switch 5 a that has a low impedance. Thus, constant current charging is performed, regardless of the overdischarged state.
- the charge/discharge control circuit 120 of the second embodiment has the advantages described as follows.
- FIG. 4 is a schematic circuit diagram of a charge/discharge control circuit 300 according to a third embodiment of the present invention.
- the charge/discharge control circuit 300 makes use some of the components in the charge/discharge control circuit 200 of the second embodiment, as identified by those labeled with identical numerals.
- the charge/discharge control circuit 300 includes an output circuit 20 B, which is configured by adding an OR circuit 11 d to the output circuit 20 A incorporated in the charge/discharge control circuit 200 of the second embodiment.
- the OR circuit 11 d is connected to the NOR circuit 15 and the overcharge detection circuit 8 . That is, the output signal of the overcharge detection circuit 8 is provided to a first input terminal of the OR circuit 11 d, and the output signal of the NOR circuit 15 is provided to a second input terminal of the OR circuit 11 d.
- the OR circuit 11 d generates and provides the second charge control signal PreCout to the second charge control switch 5 b.
- the charge/discharge control circuit 300 functions in the same manner as the charge/discharge control circuit 200 of the second embodiment.
- the output signal of the overcharge detection circuit 8 is high. This high output signal is provided to the OR circuits 11 c, 11 d. Consequently, the output signal Cout of the OR circuit 11 c is high and provided to the first charge control switch 5 a. The output signal PreCout of the OR circuit 11 d is high and provided to the second charge control switch 5 b. Thus, the first and second charge control switches 5 a, 5 b are both deactivated.
- the charge/discharge control circuit 300 of the third embodiment provides the same advantages as the charge/discharge control circuit 100 of the first embodiment, or the charge/discharge control circuit 200 of the second embodiment, as described above.
- the output circuits 20 , 20 A, 20 B in FIGS. 2-4 are not limited to those exemplary configurations illustrated in the above embodiments. In other words, these output circuits may be altered as desired, so long as the predetermined first and second charge control signals Cout, PreCout are provided.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
Description
-
- (1) If the
battery 1 is charged when any of thecells charge control switch 5b. Thus, even if the power supply (battery) voltage Vcc is decreased to a value close to 0V, the voltage drop across the resistor R immediately increases the charging voltage to the target charging voltage of 12.6V. By performing the constant voltage charging at 12.6V, the power consumption in the secondcharge control switch 5b decreases and charging is performed without heating the secondcharge control switch 5b. - (2) The voltage drop across the resistor R is set such that it is greater than the target charging voltage of 12.6V. In other words, during constant voltage charging, the charging current flowing through the second
charge control switch 5b is restricted to a value that is smaller than the current value during constant current charging. Accordingly, charging is performed without heating the secondcharge control switch 5b. - (3) Since the circuit including the second
charge control switch 5b and the resistor R is connected in parallel with the firstcharge control switch 5a, anoverdischarged battery 1 and a normal-state battery 1 are charged by way of different control switches. This prevents the control switches from being heated during charging thebattery 1 in either the overdischarged or normal state. - (4) When the voltages of the three series-connected cells in the
battery 1 are imbalanced, the first and secondcharge control switches - (5) The charge/
discharge circuit 100 allows thebattery 1 to be charged without heating the control switches. This simplifies the configuration of an external charging circuit that is to be used for charging thebattery 1, and decreases the number of components in the system.
[Second Embodiment]
- (1) If the
-
- (1) In an overdischarged state, the erroneous
functioning prevention circuit 13 simultaneously activates the first and secondcharge control switches charge control switches - (2) In an overdischarged state, unless the power supply voltage Vcc is extremely close to 0V, constant current charging may be performed by the first
charge control switch 5a. In other words, even in an overdischarged state, the firstcharge control switch 5a is allowed to perform constant current charging so long as the charging voltage is high enough to prevent heating of the firstcharge control switch 5a. Accordingly, charging is performed within a short time period without heating the control switches. - (3) By changing the threshold voltage Vth3 of the erroneous
functioning prevention circuit 13, the switching of the first and secondcharge control switches
[Third Embodiment]
- (1) In an overdischarged state, the erroneous
Claims (26)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/854,781 USRE41915E1 (en) | 2000-06-22 | 2004-05-27 | Charge/discharge control circuit and secondary battery |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000187567A JP3655171B2 (en) | 2000-06-22 | 2000-06-22 | Charge / discharge control circuit and secondary battery device |
JP2000-187567 | 2000-06-22 | ||
US09/816,108 US6396246B2 (en) | 2000-06-22 | 2001-03-26 | Charge/discharge control circuit and secondary battery |
US10/854,781 USRE41915E1 (en) | 2000-06-22 | 2004-05-27 | Charge/discharge control circuit and secondary battery |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/816,108 Reissue US6396246B2 (en) | 2000-06-22 | 2001-03-26 | Charge/discharge control circuit and secondary battery |
Publications (1)
Publication Number | Publication Date |
---|---|
USRE41915E1 true USRE41915E1 (en) | 2010-11-09 |
Family
ID=18687527
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/816,108 Ceased US6396246B2 (en) | 2000-06-22 | 2001-03-26 | Charge/discharge control circuit and secondary battery |
US10/854,781 Expired - Lifetime USRE41915E1 (en) | 2000-06-22 | 2004-05-27 | Charge/discharge control circuit and secondary battery |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/816,108 Ceased US6396246B2 (en) | 2000-06-22 | 2001-03-26 | Charge/discharge control circuit and secondary battery |
Country Status (3)
Country | Link |
---|---|
US (2) | US6396246B2 (en) |
JP (2) | JP3655171B2 (en) |
TW (1) | TW512571B (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20120293125A1 (en) * | 2011-05-16 | 2012-11-22 | Lapis Semiconductor Co., Ltd. | Comparator circuit, semiconductor device, battery monitoring system, charging rohibition method, and computer-readable medium |
US20140055084A1 (en) * | 2012-08-21 | 2014-02-27 | Makita Corporation | Charger |
US20150280469A1 (en) * | 2012-11-19 | 2015-10-01 | Byd Company Limited | Protective device and protective system for battery assembly |
Families Citing this family (34)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3471321B2 (en) * | 2000-05-12 | 2003-12-02 | セイコーインスツルメンツ株式会社 | Charge / discharge control circuit and rechargeable power supply |
DE10203909C1 (en) * | 2002-01-31 | 2003-11-20 | Dialog Semiconductor Gmbh | Charge / discharge protection circuit for a rechargeable battery |
JP2005085566A (en) * | 2003-09-08 | 2005-03-31 | Sanyo Electric Co Ltd | Charge and discharge control method of non-aqueous electrolyte secondary battery |
JP4137011B2 (en) | 2004-06-14 | 2008-08-20 | 富士通株式会社 | Charge control circuit, battery pack, and electronic device |
JP4500121B2 (en) * | 2004-07-14 | 2010-07-14 | 株式会社ルネサステクノロジ | Battery voltage monitoring system |
US20060061922A1 (en) * | 2004-09-22 | 2006-03-23 | Cellex Power Products, Inc. | Hybrid power supply system having energy storage device protection circuit |
US7508165B2 (en) * | 2004-10-19 | 2009-03-24 | Denso Corporation | Cell voltage equalization apparatus for combined battery pack including circuit driven by power supplied by the combined battery pack |
KR100624944B1 (en) * | 2004-11-29 | 2006-09-18 | 삼성에스디아이 주식회사 | Protect circuit of battery pack |
JP5083588B2 (en) * | 2006-03-31 | 2012-11-28 | 日立工機株式会社 | Lithium battery pack |
JP4713513B2 (en) * | 2007-02-13 | 2011-06-29 | プライムアースEvエナジー株式会社 | Charge / discharge device |
US8362748B2 (en) | 2007-09-12 | 2013-01-29 | Rohm Co., Ltd. | Voltage comparison circuit |
JP5189335B2 (en) * | 2007-09-19 | 2013-04-24 | ローム株式会社 | CHARGE CONTROL CIRCUIT AND ELECTRONIC DEVICE USING THE SAME |
JP5279261B2 (en) * | 2007-12-27 | 2013-09-04 | 三洋電機株式会社 | Charge state equalization apparatus and assembled battery system including the same |
WO2009090590A1 (en) * | 2008-01-18 | 2009-07-23 | Koninklijke Philips Electronics N.V. | A rechargeable electric appliance |
US8264205B2 (en) * | 2008-02-08 | 2012-09-11 | Sion Power Corporation | Circuit for charge and/or discharge protection in an energy-storage device |
US7839019B2 (en) * | 2008-05-30 | 2010-11-23 | Chun-Chieh Chang | Multipurpose portable storage and supply system |
JP2010080141A (en) * | 2008-09-25 | 2010-04-08 | Nec Tokin Corp | Multi-series multi-parallel battery pack |
TWI390821B (en) * | 2009-02-10 | 2013-03-21 | Chroma Ate Inc | Battery charging and discharging apparatus and method |
EP2479864B1 (en) | 2009-09-16 | 2016-04-20 | NEC Energy Devices, Ltd. | Secondary battery pack system |
KR101213480B1 (en) | 2010-12-01 | 2012-12-20 | 삼성에스디아이 주식회사 | Battery protecting circuit and controlling method of the same |
KR101217074B1 (en) | 2011-02-21 | 2012-12-31 | 로베르트 보쉬 게엠베하 | A battery management system |
JP5742593B2 (en) * | 2011-08-30 | 2015-07-01 | ミツミ電機株式会社 | Semiconductor integrated circuit, protection circuit and battery pack |
KR101975395B1 (en) | 2012-08-29 | 2019-05-07 | 삼성에스디아이 주식회사 | Battery pack, and controlling method of the same |
TWI489735B (en) * | 2013-02-04 | 2015-06-21 | Hon Hai Prec Ind Co Ltd | Electronic device |
JP2015220853A (en) * | 2014-05-16 | 2015-12-07 | 株式会社Ihi | Non-contact power supply system |
CN104009265B (en) * | 2014-05-22 | 2016-08-17 | Tcl通讯(宁波)有限公司 | A kind of battery activated method and apparatus of mobile terminal |
US10076969B2 (en) * | 2015-07-02 | 2018-09-18 | Johnson Controls Technology Company | Battery systems and methods for bi-directional current control |
CN106385066A (en) * | 2016-09-23 | 2017-02-08 | 宇龙计算机通信科技(深圳)有限公司 | Charging and discharging circuit of battery and terminal |
US10992144B2 (en) * | 2017-05-17 | 2021-04-27 | Galley Power LLC | Battery balancing and current control with bypass circuit for load switch |
KR102259413B1 (en) * | 2018-03-12 | 2021-06-01 | 주식회사 엘지에너지솔루션 | Apparatus for preventing over-discharge |
US11791504B2 (en) * | 2018-03-30 | 2023-10-17 | Panasonic Energy Co., Ltd. | Battery pack and charging control method therefor |
JP2022042192A (en) * | 2020-09-02 | 2022-03-14 | 株式会社東芝 | Secondary battery and control method |
CN114335763B (en) * | 2021-12-08 | 2023-05-09 | 西安航空学院 | Repairing method of waste lithium ion battery |
CN115425702B (en) * | 2022-04-28 | 2024-06-25 | 上海赛南能源有限公司 | Energy storage low-voltage lithium battery module BMS power loop topological structure and control method thereof |
Citations (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0564377A (en) | 1991-02-08 | 1993-03-12 | Honda Motor Co Ltd | Set battery charger |
JPH06105458A (en) | 1992-09-17 | 1994-04-15 | Sony Corp | Battery protection circuit |
JPH07326389A (en) * | 1994-05-30 | 1995-12-12 | Toshiba Corp | Radio communication device |
JPH1014123A (en) | 1996-06-24 | 1998-01-16 | Toshiba Battery Co Ltd | Charging circuit of secondary battery |
US5789900A (en) * | 1994-12-05 | 1998-08-04 | Fuji Photo Film Co., Ltd. | Device for protecting a secondary battery from overcharge and overdischarge |
US5896025A (en) * | 1995-12-27 | 1999-04-20 | Hitachi Maxell, Ltd. | Secondary battery protection device from overcharge/overdischarge |
JPH11164489A (en) | 1997-11-27 | 1999-06-18 | Matsushita Electric Ind Co Ltd | Charging controller built in secondary battery pack |
JPH11215716A (en) * | 1998-01-20 | 1999-08-06 | Matsushita Electric Ind Co Ltd | Battery managing apparatus, battery package, and electronic appliance |
JP2000106220A (en) | 1998-07-27 | 2000-04-11 | Sanyo Electric Co Ltd | Method for balancing charging amount of secondary battery |
US6060864A (en) * | 1994-08-08 | 2000-05-09 | Kabushiki Kaisha Toshiba | Battery set structure and charge/discharge control apparatus for lithium-ion battery |
US6087807A (en) * | 1992-11-24 | 2000-07-11 | Seiko Instruments Inc. | Charge/discharge control circuit and chargeable electric power source apparatus |
US6094034A (en) * | 1997-02-26 | 2000-07-25 | Fuji Photo Film Co., Ltd. | Method of charging a secondary battery and apparatus for the same |
JP2001275271A (en) | 2000-03-29 | 2001-10-05 | Sony Corp | Secondary cell charging device |
-
2000
- 2000-06-22 JP JP2000187567A patent/JP3655171B2/en not_active Expired - Lifetime
-
2001
- 2001-03-21 TW TW090106650A patent/TW512571B/en not_active IP Right Cessation
- 2001-03-26 US US09/816,108 patent/US6396246B2/en not_active Ceased
-
2004
- 2004-05-27 US US10/854,781 patent/USRE41915E1/en not_active Expired - Lifetime
- 2004-10-18 JP JP2004302879A patent/JP3739005B2/en not_active Expired - Lifetime
Patent Citations (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0564377A (en) | 1991-02-08 | 1993-03-12 | Honda Motor Co Ltd | Set battery charger |
JPH06105458A (en) | 1992-09-17 | 1994-04-15 | Sony Corp | Battery protection circuit |
US6087807A (en) * | 1992-11-24 | 2000-07-11 | Seiko Instruments Inc. | Charge/discharge control circuit and chargeable electric power source apparatus |
JPH07326389A (en) * | 1994-05-30 | 1995-12-12 | Toshiba Corp | Radio communication device |
US6060864A (en) * | 1994-08-08 | 2000-05-09 | Kabushiki Kaisha Toshiba | Battery set structure and charge/discharge control apparatus for lithium-ion battery |
US5789900A (en) * | 1994-12-05 | 1998-08-04 | Fuji Photo Film Co., Ltd. | Device for protecting a secondary battery from overcharge and overdischarge |
US5896025A (en) * | 1995-12-27 | 1999-04-20 | Hitachi Maxell, Ltd. | Secondary battery protection device from overcharge/overdischarge |
JPH1014123A (en) | 1996-06-24 | 1998-01-16 | Toshiba Battery Co Ltd | Charging circuit of secondary battery |
US6094034A (en) * | 1997-02-26 | 2000-07-25 | Fuji Photo Film Co., Ltd. | Method of charging a secondary battery and apparatus for the same |
JPH11164489A (en) | 1997-11-27 | 1999-06-18 | Matsushita Electric Ind Co Ltd | Charging controller built in secondary battery pack |
JPH11215716A (en) * | 1998-01-20 | 1999-08-06 | Matsushita Electric Ind Co Ltd | Battery managing apparatus, battery package, and electronic appliance |
JP2000106220A (en) | 1998-07-27 | 2000-04-11 | Sanyo Electric Co Ltd | Method for balancing charging amount of secondary battery |
JP2001275271A (en) | 2000-03-29 | 2001-10-05 | Sony Corp | Secondary cell charging device |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20120293125A1 (en) * | 2011-05-16 | 2012-11-22 | Lapis Semiconductor Co., Ltd. | Comparator circuit, semiconductor device, battery monitoring system, charging rohibition method, and computer-readable medium |
US9088053B2 (en) * | 2011-05-16 | 2015-07-21 | Lapis Semiconductor Co., Ltd. | Comparator circuit, semiconductor device, battery monitoring system, charging prohibition method, and computer-readable medium that detects battery voltages lower than a lowest operational power supply voltage |
US9620982B2 (en) | 2011-05-16 | 2017-04-11 | Lapis Semiconductor Co., Ltd. | Comparator circuit, semiconductor device, battery monitoring system, charging prohibition method, and computer-readable medium |
US20140055084A1 (en) * | 2012-08-21 | 2014-02-27 | Makita Corporation | Charger |
US9257855B2 (en) * | 2012-08-21 | 2016-02-09 | Makita Corporation | Charger |
US20150280469A1 (en) * | 2012-11-19 | 2015-10-01 | Byd Company Limited | Protective device and protective system for battery assembly |
US9837837B2 (en) * | 2012-11-19 | 2017-12-05 | Byd Company Limited | Protective device and protective system for battery assembly which detects discontinuities through voltage monitoring |
Also Published As
Publication number | Publication date |
---|---|
JP2002010509A (en) | 2002-01-11 |
TW512571B (en) | 2002-12-01 |
JP2005052000A (en) | 2005-02-24 |
JP3739005B2 (en) | 2006-01-25 |
US6396246B2 (en) | 2002-05-28 |
US20010054880A1 (en) | 2001-12-27 |
JP3655171B2 (en) | 2005-06-02 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
USRE41915E1 (en) | Charge/discharge control circuit and secondary battery | |
US11646569B2 (en) | Secondary battery protection circuit, secondary battery protection apparatus and battery pack | |
US5554919A (en) | Charge/discharge circuit having a simple circuit for protecting a secondary cell from overcharging and overdischarging | |
US8633677B2 (en) | Battery pack and method of charging battery pack | |
US10594146B2 (en) | Battery control circuit for multiple cells employing level shift circuits to avoid fault | |
US7453237B2 (en) | Battery pack | |
US20060255768A1 (en) | Battery protecting circuit | |
US10749358B2 (en) | Rechargeable battery protection integrated circuit, rechargeable battery protection device, and battery pack | |
US6614205B2 (en) | Charge/discharge control circuit and a charging-type power-supply unit | |
US9627906B2 (en) | Load/charger detection circuit, battery management system comprising the same and driving method thereof | |
KR20070065238A (en) | Battery device | |
JP3935922B2 (en) | Secondary battery charge / discharge control circuit | |
US11462921B2 (en) | Secondary-battery protection circuit and battery pack | |
US6605925B2 (en) | Power source circuit | |
CN112688394A (en) | Lithium battery charging protection circuit and lithium battery | |
JP2020198773A (en) | Secondary battery protection circuit, secondary battery protection apparatus, battery pack, and secondary battery protection circuit control method | |
CN114362287B (en) | Battery 0V charge inhibition circuit and battery protection circuit | |
JP3361712B2 (en) | Charge / discharge control circuit | |
JPH05276682A (en) | Charge controller for battery | |
US20240079888A1 (en) | Secondary battery protection integrated circuit, power supply system, and battery device | |
US20220368141A1 (en) | Secondary battery protection circuit, battery pack, battery system, and method for protecting secondary battery | |
US8823328B2 (en) | Charging apparatus that can recharge different types of batteries without overcharging them | |
JP3466021B2 (en) | Charge / discharge control circuit and rechargeable power supply using the same |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: SPANSION LLC, CALIFORNIA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:FUJITSU SEMICONDUCTOR LIMITED;REEL/FRAME:031205/0461 Effective date: 20130829 |
|
FPAY | Fee payment |
Year of fee payment: 12 |
|
AS | Assignment |
Owner name: MORGAN STANLEY SENIOR FUNDING, INC., NEW YORK Free format text: SECURITY INTEREST;ASSIGNORS:CYPRESS SEMICONDUCTOR CORPORATION;SPANSION LLC;REEL/FRAME:035240/0429 Effective date: 20150312 |
|
AS | Assignment |
Owner name: CYPRESS SEMICONDUCTOR CORPORATION, CALIFORNIA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SPANSION, LLC;REEL/FRAME:036052/0016 Effective date: 20150601 |
|
AS | Assignment |
Owner name: CYPRESS SEMICONDUCTOR CORPORATION, CALIFORNIA Free format text: RELEASE BY SECURED PARTY;ASSIGNOR:MORGAN STANLEY SENIOR FUNDING, INC.;REEL/FRAME:043062/0183 Effective date: 20170628 |
|
AS | Assignment |
Owner name: MONTEREY RESEARCH, LLC, CALIFORNIA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:CYPRESS SEMICONDUCTOR CORPORATION;REEL/FRAME:043218/0017 Effective date: 20170628 |
|
AS | Assignment |
Owner name: HUAWEI TECHNOLOGIES CO., LTD., CHINA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:MONTEREY RESEARCH, LLC;REEL/FRAME:045761/0371 Effective date: 20180120 |
|
AS | Assignment |
Owner name: MORGAN STANLEY SENIOR FUNDING, INC., NEW YORK Free format text: CORRECTIVE ASSIGNMENT TO CORRECT THE 8647899 PREVIOUSLY RECORDED ON REEL 035240 FRAME 0429. ASSIGNOR(S) HEREBY CONFIRMS THE SECURITY INTERST;ASSIGNORS:CYPRESS SEMICONDUCTOR CORPORATION;SPANSION LLC;REEL/FRAME:058002/0470 Effective date: 20150312 |