WO2005111644A1 - 二次電池良否判別装置および該装置のリップル発生回路 - Google Patents
二次電池良否判別装置および該装置のリップル発生回路 Download PDFInfo
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- WO2005111644A1 WO2005111644A1 PCT/JP2004/006760 JP2004006760W WO2005111644A1 WO 2005111644 A1 WO2005111644 A1 WO 2005111644A1 JP 2004006760 W JP2004006760 W JP 2004006760W WO 2005111644 A1 WO2005111644 A1 WO 2005111644A1
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- ripple
- secondary battery
- voltage
- battery
- resistor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
Definitions
- the present invention relates to a secondary battery pass / fail determination device and a ripple generation circuit of the device.
- the present invention relates to a rechargeable battery pass / fail determination device, and particularly to a rechargeable battery pass / fail determination device that determines deterioration of a rechargeable battery even in a bright state connected to a ripple charging circuit that does not generate ripples.
- Equipment and equipment 1
- the discharge time after the secondary battery is fully charged until the voltage between both ends of the secondary battery decreases to reach a predetermined value is measured.
- a method of determining pass / fail based on the degree In this method, it is necessary to discharge the secondary battery to be determined for a long time.
- the secondary battery pass / fail determination device described in Patent Document 1 includes a ripple applying means for flowing a rip / re-current between the two electrodes of the secondary battery, and an AC voltage component included in the voltage generated between the two electrodes of the secondary battery. Based on the AC voltage extracting means to be extracted and the magnitude of the AC voltage component extracted by the AC voltage extracting means, it is determined whether the power of the secondary battery is abnormal or not. Discriminating means for discriminating and outputting information indicating a discrimination result, wherein the discriminating means includes an average voltage representing an average value of each AC voltage component extracted by the AC voltage extracting means and each extracted by the AC voltage extracting means. The magnitude of the AC voltage component is compared to determine the presence or absence of an abnormality in the secondary battery, so the quality of the secondary battery can be easily determined in a short time without measuring the discharge time of the secondary battery can do.
- Patent Document 1
- Patent No. 3171581 (Pages 2-7, Fig. 4)
- a single-phase AC current is rectified as a ripple applying means.
- the ripple generated by the charging circuit itself was used. Therefore, recently, when a charging circuit using a power supply that generates almost no ripple, such as the switching power supply 1, which is becoming mainstream, is used, there is a problem that the secondary battery pass / fail determination device cannot be used. .
- the present invention provides a secondary battery pass / fail determination device capable of determining pass / fail of a secondary battery even when using a power supply that generates almost no ripple, and a ripple generation circuit of the device.
- the purpose is to obtain. Disclosure of the invention
- a ripple applying means for applying a ripple current between both poles of a plurality of secondary batteries connected in series;
- a ripple voltage extracting means for extracting a ripple voltage generated in the above, an average voltage generating means for generating an average voltage representing an average value of a plurality of ripple voltages extracted by the ripple voltage extracting means, and an extraction by the ripple voltage extracting means.
- a secondary battery pass / fail determination device comprising: a determination unit configured to determine that the battery is abnormal; wherein the ripple applying unit discharges the two substantially divided battery groups of the plurality of secondary batteries alternately.
- a ripple current is forcibly generated.
- the ripple applying means forcibly generates a ripple current by alternately discharging the two divided battery groups of the plurality of secondary batteries.
- the ripple applying unit includes a resistor, a capacitor, and a switching unit, and the switching unit connects both ends of the two battery groups with the resistor and the switching unit. It is characterized in that it is alternatively connected by a series circuit with a capacitor.
- the ripple applying means includes the resistor, the capacitor, and the switching means, and the switching means selectively connects a series circuit of the resistor and the capacitor to both ends of the two battery groups.
- the ripple applying unit includes a resistor and a switching unit, and the switching unit generates a forced ripple current in the two battery groups. Only occasionally, it is characterized in that both ends of these two battery groups are selectively connected by the above-mentioned plug.
- the ripple applying means includes the resistor and the switching means, and the switching means selects a resistor across the two battery groups only when forcibly generating a ripple current in the two battery groups. Connect them all together.
- a ripple applying means for applying a ripple current between both poles of the plurality of secondary batteries connected in series; and an individual pole of each of the plurality of secondary batteries.
- a plurality of ripple voltage extracting means for extracting a ripple voltage generated in between, and determining whether or not the secondary battery is abnormal based on the magnitude of the ripple voltage extracted by the ripple voltage extracting means.
- Means for determining whether the secondary battery is good or bad, the ripple applying means forcibly generating a ripple current by alternately discharging the two substantially divided battery groups of the plurality of secondary batteries.
- the octopus is specially made.
- the ripple applying means forcibly generates a ripple current by alternately discharging the two divided battery groups of the plurality of secondary batteries.
- the ripple applying unit includes a resistor, a capacitor, and a switching unit, and the switching unit connects both ends of the two battery groups with the resistor and the switching unit.
- a special feature is to selectively connect them in a series circuit with a capacitor.
- the ripple applying means includes the resistor, the capacitor, and the switching means, and the switching means selectively connects a series circuit of the resistor and the capacitor to both ends of the two battery groups.
- the ripple applying unit includes a resistor and a switching unit, and the switching unit generates a forced ripple current in the two battery groups. Only occasionally, both ends of the two battery groups are selectively connected by the resistor.
- the ripple applying means includes the resistor and the switching means, and the switching means selects a resistor across the two battery groups only when forcibly generating a ripple current in the two battery groups. Connect them all together.
- the magnitude of each ripple voltage extracted from between both poles of a plurality of secondary batteries connected in series is determined individually whether or not the difference from the average voltage representing the average value of the extracted individual ripple voltages has reached a predetermined value, and the secondary having been determined to have reached the predetermined value is determined.
- the battery includes a resistor, a capacitor, and a switching unit that alternately discharges two substantially divided battery groups of the plurality of secondary batteries to generate a forced ripple current,
- the switching means is characterized in that both ends of the two battery groups are selectively connected by a series circuit of the resistor and the capacitor.
- the magnitude of each ripple voltage extracted from between both electrodes of a plurality of secondary batteries connected in series, and the magnitude of each extracted ripple voltage And whether the difference between the magnitude of the average voltage and the average voltage representing the average value has reached the predetermined value is individually determined, and the secondary battery determined to have reached the predetermined value is determined to be abnormal.
- a resistor, a capacitor, and switching means for generating a forced ripple current by alternately discharging two substantially divided battery groups of a plurality of secondary batteries are provided. Select a series connection of a resistor and a capacitor at both ends.
- a resistor for generating a forced ripple current by alternately discharging the two divided battery groups of the plurality of secondary batteries to determine that the battery is abnormal; and a switching unit. Is characterized in that both ends of the two battery groups are selectively connected by the resistor only when a forced ripple current is generated in the two battery groups.
- the magnitude of each of the ripple voltage extracted from each of the poles of the plurality of secondary batteries connected in series and the average voltage representing the average value of each of the extracted ripple voltages are determined.
- a plurality of secondary batteries are abbreviated to determine that the secondary battery determined to have reached the predetermined value is abnormal.
- a resistor and switching means are provided for alternately discharging the two divided battery groups to generate a forced ripple current, and the switching means is provided only when a forced ripple current is generated in the two battery groups. Selectively connect resistors to both ends of the two battery groups.
- FIG. 1 is a circuit diagram illustrating a circuit configuration of a secondary battery pass / fail determination device disclosed in Patent Document 1
- FIG. 2 is a diagram illustrating a circuit configuration according to Embodiment 1 of the present invention.
- FIG. 3 is a diagram illustrating a circuit configuration according to a second embodiment of the present invention.
- FIG. 4 is a diagram illustrating an example of a circuit configuration in a case where the ripple detection unit according to the first embodiment has a simple configuration.
- FIG. 5 is a diagram showing a circuit configuration according to a third embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1 is a circuit diagram showing a circuit configuration of a secondary battery pass / fail determination device disclosed in Patent Document 1.
- this secondary battery pass / fail determination device includes a rectifier RECT I, and a ripple detection unit DET 1 including n (where n is an arbitrary positive integer) ripple detection circuits DET 1 i DET 1 n. And a capacitor C4.
- the rectifier RECT I includes, for example, n full-wave rectification circuits (not shown) for rectifying the voltage supplied to each rectifier, a primary winding and n secondary windings, and a voltage between both ends of each secondary winding. And a transformer (not shown) that supplies voltage to each full-wave rectifier circuit on a one-to-one basis. Further, the rectifier RECT I has an input terminal IN having two poles, and output terminals OU1 ⁇ to 0111 of n threads each having a positive electrode and a negative electrode.
- the input terminal IN of the rectifier RECT 1 forms the power input terminal of the secondary battery pass / fail determination device.
- the positive electrode of the secondary battery E k to be charged (where k is an integer of 1 or more and n or less) is connected to the positive electrode of the output terminal OUT k of the rectifier RECT 1, and the negative electrode of the secondary battery E k is connected to the rectifier RECT 1 output terminal OUTk is connected to the negative electrode.
- the rectifier RECT 1 When a single-phase AC voltage is applied across the input terminal IN, the rectifier RECT 1 generates a ripple voltage obtained by full-wave rectification of the single-phase AC voltage across the output terminal OUT k . . However, the rectifier RECT I is connected to the negative potential of the output terminal OUT ⁇ . Ripple voltage is generated such that the positive voltage of the output terminal OUT k becomes 0 volt or more with reference to.
- Lip detection circuits DET 1 to DET 1 n have the same configuration as each other. Assuming that k is an integer not less than 1 and not more than n, the ripple detection circuit DET 1 k includes a differential amplifier AMP 2 k , capacitors C 2 k and C 3 k , a transformer T 2 k, and a diode D l k , A resistor R 2 k , a load Z 3 k, and a light emitting diode LED 3 k .
- the capacitor C 2 k is connected between the positive terminal of the output terminal OUT k of the rectifier RECT 1 and one end of a primary winding described later of the transformer T 2 k , and the AC included in the voltage applied to one end of the transformer T 2 k is included in the capacitor C 2 k. Is passed to the other end.
- the transformer T 2 k has a primary winding and a secondary winding.
- One end of the primary ⁇ transformer T 2 k is a rectifier connected to the negative pole of the output terminal OUT k of R ECT 1, the other end, capacitor C 2 k rectifier RECT 1 of the positive electrode output terminal OUTk of both ends of the Connected to the other side not connected to.
- One end of the secondary winding of the transformer T 2 k is connected to the anode of the diode D 1 k described later, and the other end is grounded.
- the power source of the diode D 1 k is connected to a non-inverting input terminal (+ terminal shown in FIG. 1) of a differential amplifier AMP 2 k described later.
- the differential amplifier AMP 2k includes an operational amplifier (not shown) and the like, and has a non-inverting input terminal, an inverting input terminal (one terminal shown in FIG. 1), and an output terminal.
- the differential amplifier AMP 2 k generates at the output terminal a voltage proportional to the voltage at the non-inverting input terminal with reference to the potential at the inverting input terminal.
- Capacitor C 3 k smoothes the voltage between the force sword of diode D 1 k and ground. One end of the capacitor C 3 k is connected to the power cathode of the diode D l k, the other end is grounded.
- the resistance R 2 k is for generating a voltage corresponding to the average value of the voltages generated in the force swords of the diodes D 1 i to D 1 n .
- One end of the resistor R 2 k is connected to the non-inverting input terminal of the differential amplifier AMP 2 k, the other end anti differential amplifier AMP 2 k Connected to the input terminal.
- the light emitting diode LED 3 k is cascaded with the load Z 3 k to form a series circuit. Of both ends of the series circuit, the end closer to the anode of the light emitting diode LED 3 k is connected to the output terminal of the differential amplifier AM P 2 k through the load Z 3 k, the other end is grounded ing.
- the light emitting diode LED 3k When an AC voltage is applied across the series circuit formed by the light emitting diode LED 3k and the load Z 3k and the light emitting diode LED 3k is forward-biased (specifically, for example, the light emitting diode LED 3k When the voltage of the anode becomes higher than the potential of the power source by about 0.6 volts), it conducts and emits light.
- the capacitance of the capacitor C Si C 3 n are equal to each other, also resistors R 1 ⁇ l n resistance value equal arbitrariness each other.
- Capacitor C 4 is for smoothing the voltage which corresponds to average values of voltage generated in the power cathode of the diode D 1 i ⁇ D 1 n.
- One end of the capacitor C 4 is connected in common to the inverting amplifier of the differential amplifier AMP 2 ⁇ AMP 2 n, and the other end is grounded.
- Rectifier R ECT is applied to single-phase AC voltage between the two electrodes of the first power input terminal IN, it is between both output terminals ⁇ _UT k of rectifier RECT 1, the positive electrode output terminal ⁇ _UT k of the output terminal OUT k A ripple voltage is generated in such a direction as to have a positive polarity with respect to the negative electrode.
- the ripple voltage generated between the two electrodes of the output terminal OUT k is applied between the two electrodes of the secondary battery E k , and the instantaneous value of the ripple voltage reaches a voltage at which the secondary battery E k is charged. During this time, the secondary battery E k is charged.
- the potential of the inverting input terminal of the differential amplifier AMP 2 k is equal to the voltage of each force source of the diodes D 1 to D 1 n (ie, the voltage of each non-inverting input terminal of the differential amplifier AMP 2 i AMP 2 n ). ). Therefore, the value of the voltage at the output terminal of the differential amplifier AMP 2 k is calculated from the value obtained by half-wave rectifying the AC component of the voltage of the positive electrode of the secondary battery E k and smoothing it from the voltage of the positive electrode of the secondary battery E. It becomes a value proportional to the value obtained by subtracting the average of the values obtained by smoothing the AC components of each of them by half-wave rectification and subtracting them. Then, the voltage at the output terminal of the differential amplifier circuit AMP 2 k includes a light emitting diode LED 3 k and the load Z 3 k is applied across the series circuit formed.
- the light emitting diode LED 3 k is capable of generating the AC component of the voltage between both ends of the secondary battery E k
- the magnitude of the voltage exceeds the average value of the AC component of the voltage between both ends of the secondary battery by a certain value or more, light is emitted.
- the value of the AC component of the voltage across the secondary battery E k is small, and has high ability of charge and discharge of the secondary battery E k.
- the light emitting diode LED 3 k when inferior than a certain degree than the average of the ability of charge and discharge between the two ends of the charging and discharging capacity secondary battery E E ⁇ E n of the secondary battery E k It emits light.
- the secondary battery quality decision device shown in FIG. 1 the AC component of the voltage across the secondary battery E k and size, of the voltage between the both ends of the secondary battery E i to E n compares the average I straight of the AC component, the secondary battery E k AC component values rechargeable battery E of the voltage across the constant value from the average value of the AC component of the voltage between the ends of the ⁇ E n
- the light emitting diode LED 3k emit light when the value is larger than the above, it is possible to determine the quality of the secondary battery.
- the above-described secondary battery pass / fail determination device includes a rectifier RECT 1 used for rectifying a single-phase AC current and charging the secondary battery E En by a ripple applying means. It was used as. That is, this secondary battery pass / fail determination device utilizes the ripple generated by the rectifier RECT1 itself used to charge the secondary battery EiEn.
- FIG. 2 is a diagram illustrating a circuit configuration according to the first embodiment of the present invention.
- a secondary battery pass / fail judgment ripple S raw circuit 10 is connected to a plurality of series-connected secondary battery groups (battery group A and battery group B), a charging circuit Kl, and a load Z1.
- Each of the secondary batteries constituting the secondary battery group is connected to each of the input terminals UT and LT of the ripple detection unit D ⁇ ⁇ 1 shown in FIG.
- the secondary battery pass / fail judgment ripple generating circuit 10 includes a relay RL1 having two switching contacts a and b, a resistor Rl, and a capacitor C1.
- the secondary battery group connected to the charging circuit K1 is configured by arranging the secondary batteries of the secondary battery E i En in series and, for convenience, is roughly divided into battery groups A and B.
- Battery group A is composed of secondary batteries.
- the positive side of the battery group A that is, the positive side of the secondary battery is connected to one end of the charging circuit and to the switching contact a of the relay RL1 to which one end of the load is connected.
- the negative electrode side of the cell group A i.e., the negative electrode side of the rechargeable battery E k, one end of a resistor R 1, ie, is connected to the side that is not connected to the capacitor C 1.
- cell group B is constituted by a secondary battery E k + 1 ⁇ E n.
- the positive electrode side of the battery group B that is, the positive electrode side of the secondary battery E k + 1 is connected to one end of the resistor R1, that is, the side not connected to the capacitor C1.
- the negative side of battery group B Negative electrode side of the ie secondary battery E n is connected to the other end of the charging circuit, one terminal of the load is connected to the switching contact b of relay RL 1 are connected.
- One end of the capacitor C 1 is connected to the other end of the resistor R 1, that is, the side not connected to the secondary battery, and the other end is connected to a terminal that is not a switching contact of the relay RL 1. .
- Each of the secondary batteries constituting the battery group A and the battery group B is connected to a predetermined terminal of the DET 1, respectively, and the respective terminal voltages are input to the ripple detecting unit DET1.
- the positive terminal of the secondary battery E k is connected to the UT k terminal of the ripple detector DET 1
- the negative terminal is connected to the LT k terminal of the ripple detector DET 1
- the secondary battery E k The terminal voltages at both ends are applied to the ripple detector DET1.
- the capacitor C1 is for preventing current from continuing to flow when the contact of the relay RL1 is in contact with either the switching contact a or the switching contact b. If a relay is used that is not in contact with either contact a or switching contact b, capacitor C1 is not required.
- the current Ia is a current in a discharging direction as viewed from the battery group A, and a current in a charging direction as viewed from the battery group B.
- the series circuit of the resistor R 1 and the capacitor C 1 and the relay RL 1 form a discharging circuit as viewed from the battery group A, and a charging circuit as viewed from the battery group B.
- the current I b is the current I a in reverse, a direction of the current that is charged when viewed from cell group A, which is the direction of the current to discharge a view from cell groups B.
- the series circuit of the resistor R 1 and the capacitor C 1 and the relay RL 1 form a charging circuit as viewed from the battery group A, and a discharging circuit as viewed from the battery group B.
- the ripple applying means is configured to alternately discharge two substantially divided battery groups of a plurality of secondary batteries to forcibly generate a ripple current. Therefore, any ripple current can be generated even with a switching power supply that generates almost no ripple, or during charging and discharging with a constant voltage and a constant current.
- the quality of the secondary battery can be determined without affecting the system in operation. Furthermore, the voltage drop of the whole battery due to the discharge hardly occurs because the opposing battery group is in the charge mode. Also, since the capacity of the secondary battery is not discharged in a large amount, the battery life can be prolonged.
- the ripple applying means is provided with a resistor, a capacitor, and a switching means, and the switching means selectively connects a series circuit of the resistor and the capacitor at both ends of the two battery groups.
- the magnitude of each ripple voltage extracted from between the respective electrodes of the plurality of secondary batteries connected in series, and the average value of these extracted ripple voltages In addition to individually determining whether the difference between the magnitude of the average voltage and the magnitude of the average voltage has reached a predetermined value, and determining whether the secondary battery determined to have reached the predetermined value is abnormal, A resistor, a capacitor, and switching means for generating a forced ripple current by alternately discharging the two substantially divided battery groups of the secondary battery of the above are provided, and the switching means is provided at both ends of the two battery groups.
- a capacitor are connected in series, so that even a switching power supply that generates almost no ripple, or during charging and discharging with a constant voltage and constant current Also, it is possible to generate any ripple current.
- a false power failure state is not created, the quality of the secondary battery can be determined without affecting the operating system.
- the voltage drop of the whole battery due to the discharge hardly occurs because the battery group in the corresponding state is in the charging mode.
- the capacity of the secondary battery is not discharged in a large amount, there is an effect that the battery life can be prolonged.
- FIG. 3 is a diagram illustrating a circuit configuration according to a second embodiment of the present invention.
- the secondary battery pass / fail judgment ripple generation circuit 10 shown in FIG. 10 is different from the first embodiment shown in FIG. 1 in that a relay RL 1 which is a means for generating alternating ripples in the secondary battery group is replaced with a relay RL 1.
- Transformers T3 and ⁇ 4 and bipolar transistors TR1 and TR2, so that AC signals input to the transformers ⁇ 3 and ⁇ 4 generate ripples in the secondary battery group. I have.
- no AC signal is applied, no current flows through both the bipolar transistors TR 1 and TR 2, so there is no need to provide the capacitor C 1 as in the first embodiment.
- connection between each of the secondary batteries E i En and the ripple detecting unit DET 1 is the same as in the first embodiment, but is omitted for convenience of explanation. Other configurations are the same as in the first embodiment. The same parts are denoted by the same reference numerals.
- the secondary battery pass / fail judgment ripple generating circuit 10 of this embodiment includes transformers T3 and # 4 and bipolar transistors TR1 and TR2.
- the secondary battery group connected to the charging circuit K1 is configured by arranging the secondary batteries of the secondary battery Ei En in series and, for convenience, is roughly divided into battery groups A and B.
- Cell group A is constituted by a secondary battery Ei Ek
- cell group B is constituted by a secondary battery E k + 1 ⁇ E n.
- the positive electrode side of the battery group A that is, the positive electrode side of the secondary battery is connected to one end of the charging circuit and to the collector of the bipolar transistor TR2 to which one end of the load is connected.
- the negative electrode side of the cell group A, ie, the negative electrode side of the rechargeable battery E k is connected to one end of the resistor R 1.
- the positive electrode side of the battery group B that is, the positive electrode side of the secondary battery E k + 1 is connected to one end of the resistor R 1.
- the negative electrode side of the cell group B that the negative electrode side of the rechargeable battery E n is connected to the other end of the charging circuit, connected to Emitta of bipolar transistors TR 1 to the other end of the load is connected ing.
- the other end of the resistor R1 is connected to a connection point between the emitter of the bipolar transistor TR2 and the collector of the bipolar transistor TR1.
- Transformer T3 has a primary winding and a secondary winding inductively coupled to the primary winding.
- One end of the primary winding of the transformer T3 is connected to a terminal to which an AC signal is input, and the other end is connected to a common line (ground side line) to which a charging circuit Kl, a load ⁇ 1, etc. are connected.
- one end of the secondary winding of the transformer # 3 is connected to the base of the bipolar transistor # R1, and the other end is connected to a common line like the primary winding.
- the primary winding and the secondary winding of the transformer 3 are defined by the voltage generated at one end of the primary winding and the voltage of the secondary winding when the voltage is generated in accordance with the change in the current flowing through the primary winding. It is coupled so that the voltage generated at one end is a voltage of the opposite polarity.
- the transformer No. 4 has a primary winding and a secondary winding inductively coupled to the primary winding.
- One end of the primary winding of the transformer # 4 is connected to a common terminal with the transformer # 3 to which an AC signal is input, and the other end is a common line to which a charging circuit Kl, a load # 1, etc. are connected. (Ground side line).
- One end of the secondary winding of the transformer T4 is connected to the base of the bipolar transistor TR2, and the other end is connected to the other end of the resistor R1, the emitter of the bipolar transistor TR1, and the bipolar transistor TR.
- the primary winding and the secondary winding of the transformer T3 are connected to the connection point where the collector of the transformer 2 is connected. In this case, the voltage generated at one end of the primary winding and the voltage generated at one end of the secondary winding are coupled so as to have the same polarity.
- the primary winding and the secondary winding of the transformer T3 connected to the bipolar transistor TR1 are connected in opposite polarities, and the transformer T4 connected to the bipolar transistor TR2 and connected to the bipolar transistor TR2 has a reverse polarity. Since the primary winding and the secondary winding are connected to have the same polarity, the bipolar transistor TR is generated by the positive half cycle of the AC signal S generated by the transformers T3 and T4. 2 turns on and bipolar transistor TR1 turns off. Conversely, in the negative half cycle of the AC signal source input to the transformer T3, ⁇ 4, the bipolar transistor T R1 is turned on and the bipolar transistor T R2 is turned off. Due to these operations, a current that alternates between discharging and charging flows through the battery groups ⁇ and ⁇ ⁇ ⁇ . The operation in which this current flows is the same as in the first embodiment, and a description thereof will be omitted.
- ripples can be forcibly generated in the secondary battery group of the secondary batteries E i En, and the terminal of each secondary battery in which this ripple has occurred is generated. since so as to apply voltage to ripple detecting unit DET 1, the Rippunore detector DET 1 shown in the first embodiment, it is possible to determine the respective quality of the secondary battery E i ⁇ E n.
- the lip contact applying means is provided with the resistor and the switching means, and the switching means is used only when the forced ripple current is generated in the two battery groups. Since the resistors are selectively connected to both ends of the battery group, even if the switching power supply generates almost no ripple, or if the battery is being charged with a constant voltage and constant current or discharged. Also any ripple A current can be generated. Also, since a false power failure state is not created, the quality of the secondary battery can be determined without affecting the system in operation. Furthermore, the voltage drop of the whole battery due to the discharge hardly occurs because the opposing battery group is in the charge mode. Also, since the capacity of the secondary battery is not discharged in a large amount, the battery life can be extended.
- the magnitude of each ripple voltage extracted from between the respective electrodes of the plurality of secondary batteries connected in series, and the average value of these extracted ripple voltages In addition to individually determining whether the difference between the magnitude of the average voltage and the magnitude of the average voltage has reached a predetermined value, a plurality of batteries are determined to determine that the secondary battery determined to have reached the predetermined value is abnormal. And a switching means for alternately discharging the two divided battery groups of the secondary battery to generate a forced ripple current, and a switching means, wherein the switching means comprises a forced ripple in the two battery groups.
- FIG. 4 is a diagram showing an example of a circuit configuration when the ripple detection unit DET1 of the first embodiment has a simple configuration.
- This circuit is a generally known circuit for detecting a ripple.
- the ripple detection unit DET 2 shown in the figure includes a capacitor C 5, a differential amplifier AMP 1, a light emitting diode LED 4, and a resistor R 3.
- the ripple detection unit DET 2 includes a pair of input terminals UT and LT.
- the input terminal UT is connected to the positive electrode side of the rechargeable battery E x, the input terminal LT, the negative electrode side of the connected secondary battery E x is connected to the input terminal UT.
- the differential amplifier AMP1 includes an operational amplifier (not shown) and the like, and has a non-inverting input terminal, an inverting input terminal, and an output terminal.
- the differential amplifier AMP1 outputs from the output terminal a voltage proportional to the voltage at the non-inverting input terminal with reference to the potential at the inverting input terminal.
- the capacitor C5 is connected between the input terminal UT and the non-inverting input terminal of the differential amplifier AMP1, and allows the AC component contained in the voltage applied to one end of the capacitor C5 to pass to the other end.
- the light emitting diode LED 4 forms a series circuit connected in series with the resistor R 3, and one of the two ends of the series circuit, that is, the anode of the light emitting diode LED 4 is connected to the differential amplifier AMP 1. The other end, that is, the other end of the resistor R3, is connected to the input terminal LT. .
- the magnitude of the ripple occurring between the electrodes of the secondary battery E x is the output impedance of the output terminal of the charging circuit (not shown) connected to the secondary battery E x, the impedance between the electrodes of the rechargeable battery Depends on the value.
- Rippunore generated in the positive electrode of the secondary battery E x is applied to the non-inverting input terminal of the differential amplifier AMP 1 through the capacitor C 5.
- the potential of the inverting input terminal of the differential amplifier AMP 1 since the negative electrode of the same potential of the secondary battery E x, when with respect to the potential of the inverting input terminal of the differential amplifier AM PI, the difference the value of the voltage at the non-inverting input terminal of the dynamic amplifier AMP 1 is equal to the value of the AC component of the positive electrode of the voltage of the secondary battery E x.
- the secondary battery E x has the property that when a current containing a ripple flows between both electrodes while the charge / discharge capacity is normal, the voltage ripple generated between the two electrodes becomes less than a certain value. It has.
- FIG. 5 is a diagram showing a circuit configuration according to a third embodiment of the present invention.
- the ripple generation circuit 10 for judging pass / fail of the secondary battery shown in the same drawing is the same circuit as the first embodiment in FIG. Further, each of the secondary batteries is connected to each of the n ripple detection units DET 2 shown in FIG.
- Other configurations are the same as those of the first embodiment, and the same portions are denoted by the same reference numerals.
- the ripple detectors DET 2 for detecting the lip loss of a single secondary battery are prepared for the number of secondary batteries connected in series (n in the example in FIG. 5).
- the quality of each of the secondary batteries Ei to En can be determined by the ripple detection unit DET2 connected to n .
- the ripple applying unit is configured to discharge the substantially two divided battery groups of the plurality of secondary batteries alternately to forcibly generate a ripple current. Therefore, any ripple current can be generated even with a switching power supply that generates almost no ripple, or during charging and discharging at a constant voltage or constant current. Also, since a false power failure state is not created, the quality of the secondary battery can be determined without affecting the system in operation. Furthermore, the voltage drop of the entire battery due to discharge hardly occurs because the opposing battery group is in the charging mode. Also, since the capacity of the secondary battery is not discharged in a large amount, the battery life can be prolonged.
- the magnitude of each ripple voltage extracted from between the respective electrodes of the plurality of secondary batteries connected in series, and the average value of these extracted ripple voltages In addition to individually determining whether or not the difference between the magnitude of the average voltage and the average voltage representing a predetermined value has reached a predetermined value, a plurality of batteries are determined to determine that the secondary battery determined to have reached the predetermined value is abnormal.
- a resistor and switching means for generating a forced ripple current by alternately discharging the two divided battery groups of the next battery k are provided, and the switching means applies the forced ripple current to the two battery groups.
- the resistor is alternatively connected to both ends of the two battery groups only when it is generated, so even if it is a switching power source that generates almost no ripple, or a constant voltage ⁇ constant current Charging Even during the preliminary discharge can be generated any ripple current.
- a simulated power failure state is not created, the quality of the secondary battery can be determined without affecting the operating system.
- the voltage drop of the whole battery due to discharge hardly occurs because the opposing battery group is in the charging mode.
- the capacity of the secondary battery is not discharged in a large amount, the battery life can be extended. Industrial applicability
- the present invention is useful as a secondary battery pass / fail determination device that determines pass / fail of a secondary battery, and in particular, wants to perform pass / fail determination of a secondary battery without affecting a system in operation. Suitable for cases.
Abstract
Description
Claims
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PCT/JP2004/006760 WO2005111644A1 (ja) | 2004-05-13 | 2004-05-13 | 二次電池良否判別装置および該装置のリップル発生回路 |
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PCT/JP2004/006760 WO2005111644A1 (ja) | 2004-05-13 | 2004-05-13 | 二次電池良否判別装置および該装置のリップル発生回路 |
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Cited By (1)
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CN107250815A (zh) * | 2015-06-16 | 2017-10-13 | 株式会社Lg 化学 | 转换继电器和使用转换继电器的电池电压测量系统 |
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JPH10285818A (ja) * | 1997-03-28 | 1998-10-23 | Nissan Motor Co Ltd | 組電池の充放電制御装置 |
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