JP2002125322A - Charging and discharging device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect disconnections or faulty contacts between a load line and a detecting line, in a charging and discharge device which charges and discharges a secondary battery. SOLUTION: This charging and discharging device 1 comprises a charging and discharging section 3 for charging and discharging the secondary battery 2, a voltage- measuring section 4 for measuring the terminal voltage of the secondary battery 2, and a control part 5 for controlling the charging and discharging section 3, corresponding to the terminal voltage of the secondary battery 2 measured by the voltage- measuring section 4. Terminals 7a, 7b for measuring voltage connected with the voltage-measuring section 4 via the terminals of the secondary battery 2 and the detecting line 9 includes a configuration for applying voltage for detecting abnormality beyond the range of the working voltage of the secondary battery 2 via a high resistor 10. The control section 5 includes a configuration for determining it as an abnormality of occurrence, if the measured voltage by the measuring section 4 exceeds the range of the working voltage of the secondary battery 2. Disconnection or faulty contacts between the load line 8 and the detecting line 9 can be also detected, based on the voltages of terminals 6a, 6b for charging and discharging and the voltages of the terminals 7a, 7b for measuring voltage.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to charging and discharging various kinds of secondary batteries with a predetermined current, measuring the voltage of the secondary batteries, and measuring the charge / discharge characteristics and life of the secondary batteries. The present invention relates to a charging / discharging device for measuring the like.

[0002]

2. Description of the Related Art FIG. 4 is an explanatory view of a conventional charging / discharging device, wherein 41 is a charging / discharging device, 42 is a secondary battery, and 43 is a charging / discharging device.
A discharge unit, 44 is a voltage measurement unit, and 45 is a control unit. The secondary battery 42 is connected to the charge / discharge unit 43, and the voltage measurement unit 44
To a secondary battery 42 via a detection line for measuring the terminal voltage of the secondary battery 42.

The control unit 45 controls the charge / discharge unit 4 in accordance with the control contents set corresponding to the test items of the secondary battery 42 and the like.
3 is controlled to charge or discharge the secondary battery 42. In addition, the terminal voltage of the secondary battery 42 at that time is measured by the voltage measuring unit 44 and notified to the control unit 45, and the current in the charging / discharging unit 43 is measured and notified to the control unit 45, whereby a predetermined The control unit 45 controls the charging / discharging unit 43 so that the secondary battery 42 can be charged and discharged within the voltage range described above and within a predetermined current range. By measuring the voltage and charge / discharge current of the secondary battery 42 at that time, the charge / discharge characteristics of the secondary battery 42 can be measured.

FIG. 5 is an explanatory view of a charge / discharge path. The same reference numerals as in FIG. 4 denote the same parts, 51 is a DC power supply, 52 is an electronic load unit, Q1 to Q5 are transistors, R1 and R2 are resistors, RV Denotes a variable resistor, and OPA denotes an operational amplifier. A dotted arrow indicates a discharging path, and a dashed-dotted arrow indicates a charging path.

[0005] The DC power supply 51 is a power supply for charging the secondary battery 42. Usually, the DC power supply 51 is a DC power supply obtained by rectifying a commercial AC voltage, and is configured to obtain a desired output voltage and output current. it can. Also, the electronic load section 52 is a secondary battery 4
2 controls the current flowing during charging and discharging. The electronic load unit 52 includes a transistor Q5 and an operational amplifier OP
A, a resistor R1, a resistor R2, and a variable resistor RV. A current flowing through the transistor Q5 is detected by a resistor R1.
2, a comparison voltage adjusted by the variable resistor RV from the DC power supply 51 is input to the + terminal of the operational amplifier OPA, and the comparison voltage and the current detection value by the resistor R1 are input to the minus terminal of the operational amplifier OPA. Are compared by the operational amplifier OPA, and control is performed such that a current corresponding to the value of the variable resistor RV adjusted by the control unit 45 flows through the transistor Q5.

The secondary battery 42 via the electronic load 52
Is discharged by turning on the transistors Q2 and Q3 by the control unit 42.
3 → transistor Q5 of electronic load unit 52 → dotted line arrow via transistor Q2. At that time, the control unit 45 controls the resistance value of the variable resistor RV,
The discharge current can be controlled by adjusting the comparison voltage applied to the operational amplifier OPA.

The charging of the secondary battery 42 is performed by turning on the transistors Q1 and Q4 by the control unit 42, so that the DC power supply 51 → the transistor Q1 → the transistor Q5 of the electronic load unit 52 → the transistor Q4 → the secondary battery 42 → This is performed along the path indicated by the dashed-dotted arrow of the DC power supply 51.
At this time, the charging current can be controlled by controlling the resistance value of the variable resistor RV by the control unit 45 and adjusting the comparison voltage applied to the operational amplifier OPA. That is, the case where the electronic load unit 52 is used for both the charge current control and the discharge current control of the secondary battery 42 is shown. Then, the terminal voltage of the secondary battery 42 due to charging or discharging is
By measuring with the voltage measuring unit 44 shown in FIG.
The relationship between the charging current, the charging time, and the terminal voltage, and the relationship between the discharging current, the discharging time, and the terminal voltage can be obtained as measurement data.

[0008]

The rechargeable battery 42 has a variety of structures, and the charging / discharging test requires a relatively long time. Also, a plurality of charging / discharging devices 41
It is common to perform a charge / discharge test of a plurality of secondary batteries at the same time by installing the battery. In order to connect the secondary battery under test to a charge / discharge device, a charge / discharge unit 43 and a secondary battery 42 are connected. It is necessary to connect a load line between them and a detection line between the voltage measuring unit 44 and the secondary battery. In this case, if the connection of the detection line is disconnected, the terminal voltage of the secondary battery cannot be measured, so that the charge / discharge cannot be accurately controlled, and overdischarge or overcharge occurs.

If the connection of the load line is not secure, a large current flows through the poor contact portion, which may cause an accident such as heat generation or burnout. When such an abnormal occurrence is found, a charge / discharge test must be performed from the beginning, and there is a problem that the test period is extended. An object of the present invention is to make it possible to reliably detect a disconnection of a detection line or a load line.

[0010]

According to the present invention, there is provided a charge / discharge device comprising:
Referring to FIG. 1, a charging / discharging unit 3 for charging and discharging the secondary battery 2, a voltage measuring unit 4 for measuring a terminal voltage of the secondary battery 2, and measurement by the voltage measuring unit 4. A charging / discharging device 1 including a control unit 5 for controlling a charging / discharging unit 3 according to a terminal voltage of a secondary battery, for voltage measurement connected to a voltage measuring unit 4 by a terminal of the secondary battery 2 and a detection line. The control unit 5 includes a configuration in which a voltage outside the operating voltage range of the secondary battery 2 is applied to the terminals 7 a and 7 b via the high resistance 10.
Has a configuration in which it is determined that an abnormality has occurred when the voltage measured by the voltage measuring unit 4 is out of the operating voltage range of the secondary battery 2.

A charging / discharging unit for charging and discharging the secondary battery; a voltage measuring unit for measuring a terminal voltage of the secondary battery; and a charging unit in accordance with the terminal voltage of the secondary battery measured by the voltage measuring unit. A charging / discharging device including a control unit for controlling the discharging unit, the charging / discharging terminal connecting the charging / discharging unit and the secondary battery via a load line, the secondary battery terminal via a detection line, A switching circuit for switching the voltage measurement terminal to be connected to the voltage measurement unit, and the control unit determines that a difference between the voltage of the charge / discharge terminal and the voltage of the voltage measurement terminal exceeds a predetermined value. In such a case, a configuration is provided in which it is determined to be abnormal.

A charging / discharging section for charging and discharging the secondary battery; a voltage measuring section for measuring a terminal voltage of the secondary battery; and a charging section in accordance with the terminal voltage of the secondary battery measured by the voltage measuring section. A charge / discharge device including a control unit that controls the discharge unit, wherein the voltage measurement unit includes a charge / discharge terminal that connects the charge / discharge unit and the secondary battery via a load line, and a detection line. The control unit has a configuration for measuring the voltage of the voltage measurement terminal connected to the terminal of the secondary battery, and the control unit determines that the difference between the voltage of the charge / discharge terminal and the voltage of the voltage measurement terminal exceeds a predetermined value. The system has a configuration to determine that an abnormality has occurred when there is an error.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory view of a first embodiment of the present invention, wherein 1 is a charge / discharge device, 2 is a secondary battery, 3 is a charge / discharge unit, 4 is a voltage measurement unit, 5 is a control unit, 6a, 6
bh charge / discharge terminal, 7a and 7b are voltage measurement terminals, 8 is a load line, 9 is a detection line, 10 is a high resistance (Ra), and 11 is an abnormality detection applied to the detection line 9 via the high resistance 10. And Ri indicate the input impedance of the voltage measuring unit 4.
The charge / discharge unit 3 is, for example, an electronic load unit 5 shown in FIG.
2 and transistors Q1 to Q4. Further, the voltage measuring section 4 can be configured to include digital voltage measuring means having an AD conversion function.

The input impedance R of the voltage measuring unit 4
i, the high resistance Ra, the resistance Rb of the detection line 9, and the internal impedance Rbat of the secondary battery 2, (Ri,
Ra) ≫ (Rb, Rbat), where V is the voltage for abnormality detection 11 and Vb is the voltage of the secondary battery 2
Assuming that a ≠ Vb, the voltage measuring unit 4 converts the voltage across the input impedance Ri from analog to digital and transfers it to the control unit 5 as a digital measured voltage. At this time, if the detection line 9 is normally connected, the abnormality detection voltage Va
Are dropped by the high resistance Ra, and the low resistances Rb, Rb
The terminal voltage Vbat of the secondary battery 2 via at appears at both ends of the input impedance Ri.

When the detection line 9 is disconnected from the voltage measurement terminals 7a and 7b, or is disconnected from the terminal of the secondary battery 2, the voltage across the input impedance Ri of the voltage measurement unit 4, ie, the measured voltage Vi Is as follows: Vi = Va × Ri / (Ri + Ra)

In this case, the voltage range of the secondary battery 2 is Vb1
If Vb2, the voltage Va for abnormality detection and the high resistance Ra are selected so that Vi ≠ (Vb1 to Vb2).
Therefore, the control unit 5 determines that the measured voltage Vi of the voltage measurement unit 4 is V
When it is out of b1 to Vb2, it is determined that the connection of the detection line 9 is disconnected, and an abnormality determination can be displayed by turning on an alarm lamp (not shown) or sounding an alarm.

FIG. 2 is an explanatory view of a second embodiment of the present invention, wherein 21 is a charge / discharge device, 22 is a secondary battery, 23 is a charge / discharge unit, 24 is a voltage measurement unit, and 25 is a control unit. , 26
Reference numerals a and 26b denote charge / discharge terminals, 27a and 27b denote voltage measurement terminals, 28 denotes a load line, 29 denotes a detection line, and 30 denotes a switching circuit.

In this embodiment, charging and discharging terminals 26a,
26b and the voltage measuring terminals 27a and 27b are switched and connected to the voltage measuring unit 24 via the switching circuit 30, and the switching circuit 30 is controlled from the control unit 5 or the outside via a path not shown. . When the load line 28 and the detection line 29 are normally connected, the voltage VB measured by switching the charging / discharging terminals 26a and 26b to the voltage measuring unit 24 and the voltage measuring terminals 27a and 27b are connected to the voltage measuring unit. 24 and notifies the control unit 25 of the measured voltage VS.

During or before or after the charging / discharging operation, the control unit 25 determines that VB ≒ VS is normal based on the measurement result by the voltage measurement unit 24, and judges that VB ≠ VS is normal. Is determined to be abnormal. For example, when the measured voltage during the discharge of the secondary battery 22 is VB≪VS, it can be determined that the connection portion of the load line 28 has poor contact or disconnection. If VB≫VS, it can be determined that the detection line 29 is disconnected. It should be noted that an allowable range is set in consideration of a voltage drop due to the load line 28 and the like, and comparison with the measured voltages VB and VS is performed. Further, by making a determination including the measurement polarity, it is possible to detect whether or not the connection polarity of the load line 28 and the detection line 29 is normal.

The control unit 25 calculates the abnormality determination result as described above.
A display or a lamp can be displayed on a display unit such as a liquid crystal panel (not shown). At the same time, an alarm can be sounded. As a result, it is possible to quickly take measures against disconnection of the load line 28 and the detection line 29 and poor contact, and the like.
2 can be performed.

FIG. 3 is an explanatory view of a third embodiment of the present invention, in which 31 is a charge / discharge device, 32 is a secondary battery, 33 is a charge / discharge unit, 34 is a voltage measurement unit, and 35 is a control unit. , 36
Reference numerals a and 36b denote charge / discharge terminals, 37a and 37b denote voltage measurement terminals, 38 denotes a load line, and 39 denotes a detection line.

As in the second embodiment, the voltages of the charge / discharge terminals 36a and 36b and the voltage measurement terminal 37
a and 37b are measured in the voltage measuring unit 34. The voltage measurement unit 34 may be configured to provide the switching circuit shown in FIG. 2 and alternately measure the voltage of the charge / discharge terminals 36a and 36b and the voltage of the voltage measurement terminals 37a and 37b. . Then, the voltage measurement result is transmitted to the control unit 35.
Transfer to The control unit 35 includes charge / discharge terminals 36a, 36
It is determined whether or not | VB−VS |> Rr · Ir based on the voltage VB of b, the voltage VS of the voltage measurement terminals 37a and 37b, the resistance Rr of the load line 38, and the charge / discharge current Ir.

During charging of the secondary battery 32, VB-VS> R
When the relationship of r · Ir is satisfied, the voltage of the secondary battery 32 does not increase even if the battery is charged with the voltage VB, or the voltage of the secondary battery 32 cannot be measured. 39 can be determined as a disconnection or poor contact.

During discharge of the secondary battery 32, BS-VB>
When the relationship of Rr · Ir is satisfied, it indicates that the voltage of the secondary battery 32 is not applied to the charging / discharging terminals 36a and 36b. Therefore, it can be determined that the connection of the load line 38 is disconnected or the contact is poor. it can. Also, during discharge of the secondary battery 32, VB
-VS> Rr · Ir, the secondary battery 3
Since the voltage of the second line cannot be measured, it can be determined that the detection line 39 is disconnected.

The control unit 35 determines the result of the above-described abnormality determination as follows:
A display or a lamp can be displayed on a display unit such as a liquid crystal panel (not shown). At the same time, an alarm can be sounded. As a result, it is possible to quickly take measures against disconnection of the load line 38 and the detection line 39 and poor contact, etc.
2 can be performed.

[0026]

As described above, according to the present invention, charging and
A charging / discharging device that charges and discharges the secondary battery 2 via a load line 8 by a discharging unit 3 and measures a terminal voltage of the secondary battery 2 via a detection line 9 by a voltage measuring unit 4; When a voltage 11 for abnormality detection is applied to the measurement terminals 7a and 7b through the high resistance 10, the voltage measured by the voltage measurement unit 4 in the normal state is the terminal voltage of the secondary battery 2, but the detection line 9 In the case of disconnection, the voltage outside the change range of the terminal voltage of the secondary battery 2 is measured by the voltage 11 for abnormality detection via the high resistance 10. It can be determined that the connection has been lost. Therefore, abnormal charging and discharging of the secondary battery 2 can be prevented.

As shown in the second and third embodiments,
The voltage of the charge / discharge terminal and the voltage of the voltage measurement terminal are each measured by the voltage measurement unit and notified to the control unit, and when a large difference occurs between the voltages, the control unit detects the detection line or the load. It can be determined that there is an abnormality such as disconnection of the wire or poor contact. Thereby, by detecting the abnormal connection state of the detection line and the load line quickly and repairing it, it is possible to avoid damage due to overcharge or overdischarge during the charge and discharge test of the secondary battery, Since normal charge / discharge control can be quickly restored, there is an advantage that a useless charge / discharge measurement period can be reduced.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a first embodiment of the present invention.

FIG. 2 is an explanatory diagram of a second embodiment of the present invention.

FIG. 3 is an explanatory diagram of a third embodiment of the present invention.

FIG. 4 is an explanatory diagram of a conventional charge / discharge device.

FIG. 5 is an explanatory diagram of a charge / discharge path.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Charge / discharge device 2 Secondary battery 3 Charge / discharge part 4 Voltage measurement part 5 Control part 6a, 6b Charge / discharge terminal 7a, 7b Voltage measurement terminal 8 Load line 9 Detection line 10 High resistance 11 Voltage for abnormality detection

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2G016 CA00 CB12 CC01 CC04 CC06 CC07 CC16 CC27 CE03 5G003 AA01 BA01 DA07 EA09 5H030 AA00 AS20 FF43 FF44

Claims (3)

[Claims] A charge / discharge unit for charging and discharging a secondary battery, a voltage measuring unit for measuring a terminal voltage of the secondary battery, and a terminal voltage of the secondary battery measured by the voltage measuring unit. In a charge / discharge device including a control unit that controls the charge / discharge unit in response, a terminal of the secondary battery and a voltage measurement terminal connected to the voltage measurement unit by a detection line, through a high resistance The control unit is configured to apply a voltage outside the operating voltage range of the secondary battery, and the control unit is configured to determine that an abnormality has occurred when the measured voltage of the voltage measuring unit is outside the operating voltage range of the secondary battery. A charge / discharge device characterized by the above-mentioned. 2. A charging / discharging unit for charging and discharging a secondary battery, a voltage measuring unit for measuring a terminal voltage of the secondary battery, and a terminal voltage of the secondary battery measured by the voltage measuring unit. A charging / discharging device including a control unit that controls the charging / discharging unit in response to the charging / discharging terminal that connects the charging / discharging unit and the secondary battery via a load line; And a voltage measurement terminal connected via a detection line, and a switching circuit for switching connection to the voltage measurement unit, wherein the control unit includes a voltage of the charge / discharge terminal and a voltage of the voltage measurement terminal. A charge / discharge device comprising a configuration for determining an abnormality when a difference between the charge and discharge exceeds a predetermined value. 3. A charging / discharging unit for charging and discharging the secondary battery, a voltage measuring unit for measuring a terminal voltage of the secondary battery, and a terminal voltage of the secondary battery measured by the voltage measuring unit. A charging / discharging device including a control unit that controls the charging / discharging unit in response to the charging / discharging terminal, wherein the voltage measuring unit is a charging / discharging terminal that connects the charging / discharging unit and the secondary battery via a load line. And a configuration for measuring a voltage of a voltage measurement terminal connected to a terminal of the secondary battery via a detection line, wherein the control unit controls the voltage of the charge / discharge terminal and the voltage of the voltage measurement terminal. A charging / discharging device comprising: a configuration for determining an abnormality when a difference from a voltage exceeds a predetermined value.