JPH06148297A - Control device of charge/discharge device - Google Patents

Abstract

PURPOSE:To obtain only the charge characteristics and life characteristics required by a user by measuring the voltage across the terminals of a secondary battery at a predetermined interval to store the same and recording the timewise change of the voltage across the terminals of the battery on the basis of the stored voltage. CONSTITUTION:A user uses a keyboard 16 to input test conditions to a CPU 11 to set not only voltage, a stop time and the operation number of times but also the capacity test of this time. After setting, usual operation is repeated N-times to transfer capacity testing operation and, after T4-time charge, the operation is stopped for a T5 time. The discharge start time t1 for measuring a discharge time T is measured and recorded and, subsequently, a capacity test is conducted to measure and record a discharge test completion time t2. Discharge characteristics are printed by a printer 15 according to the test results and C=(t2-t1)Xi2[A.H] is calculated from discharge start and completion times t1, t2 and a discharge current i2 and n-C characteristics are printed from the calculation result C and the set number (n) of times by the printer 15 and capacity testing operation is completed after a T6 time. This operation is repeated the set number of times to complete the entire program.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a charge / discharge system controller for testing the performance of a chargeable / dischargeable secondary battery.

[0002]

2. Description of the Related Art A conventional charging / discharging system is constructed as shown in FIG. In FIG. 4, a constant voltage constant current power supply 1
Operates as a constant current source when the inter-terminal voltage of the secondary battery 2 as the DUT is equal to or lower than the set voltage.
When the voltage between terminals is a set voltage, it operates as a constant voltage source. The constant current load device 3 adjusts the secondary battery 2 so that the current supplied from the secondary battery 2 has a preset value.
The value of the load is changed according to the voltage across the terminals.

The controller 4 controls the constant voltage / constant current source 1, the constant current load device 3 and the switches S1 and S2 in accordance with conditions preset by the user. Then, the controller 4 determines the operation state of the charging / discharging system 5 at present by the light emitting diodes D1, D2, D3, D.
A voltage is applied to any one of the four to turn it on and display it to the user. Here, R1 to R4 are resistors for limiting the current flowing through the light emitting diodes D1 to D4.

Such a charging / discharging system 5 is used as a secondary battery 2
, And the voltage v between the terminals of the secondary battery 2 as shown in FIG.
The user tests the performance of the secondary battery 2 in a state where the XY recorder 6 for recording the change with time of the battery is further connected to the secondary battery 2 with the XY recorder for recording the change with time of the discharge current i.

An example of the performance test of the secondary battery performed by using the conventional system configured as described above will be described with reference to FIG.

FIG. 5 is a diagram showing changes over time in the inter-terminal voltage v and the charging / discharging current i of the secondary battery 2, and changes in the inter-terminal voltage v are recorded by the XY recorder 6 from moment to moment. Here, the user sets the following conditions using the controller 4 before starting the test. That is, the voltage v ₁ at which the constant voltage / constant current power supply 1 shifts from the constant current mode to the constant voltage mode, the discharge end voltage v ₂ during the normal operation, the discharge end voltage v ₃ during the capacity test operation, and the constant voltage constant current power supply 1 constant. Charging current i ₁ in current mode, discharge current by constant current load device 3 −i
₂ , charging time T ₁ and rest time T during normal operation
₂ , T ₃ , the charging time T ₄ during the capacity test operation, the rest time T ₅ , T ₆ , and the number N of energization operations are set by the user using the controller 4 before the start of the test. Furthermore, the user is N
Before the start of the test, the controller 4 is used to set the number of cycles of the capacity test operation in which one normal operation is performed in advance.

The user conducts a performance test of the secondary battery 2 in the state set as described above.

When the performance test is started, the controller 4 starts the constant voltage / constant current power supply 1 and switches the switches S1 and S2 to the terminal a.
And a voltage is applied to the light emitting diode D1 via the resistor R1 to light the diode D1 and display that the charging / discharging system 5 is in a charging state. In this state, the constant voltage constant current power supply 1 is in the constant current mode, the charging current i ₁ flows through the secondary battery 2, and the inter-terminal voltage v of the secondary battery 2 rises. When the terminal voltage v reaches the set voltage v ₁ , the constant voltage / constant current power supply 1 shifts to the constant voltage mode. When the charging time T ₁ elapses, the controller 4 stops the constant voltage / constant current power supply 1 to stop the application of the voltage to the light emitting diode D ₁ and turns on the light emitting diode D3 so that the charging / discharging system 5 operates. Display that it is dormant. This rest time is a preset time T ₂ .

When the rest time T ₂ has elapsed, the controller 4
Connects the switches S1 and S2 to the terminal b to connect the secondary battery 2 to the constant current load device 3 for discharging, and
The light emitting diode D2 is turned on to indicate that the charging / discharging system 5 is in a discharging state. At this time, the controller 4 controls the constant current load device so that the value of the discharge current becomes the set current i ₂ . As a result of this discharge, the voltage v between the terminals of the secondary battery 2 decreases, and when the value reaches the discharge end voltage v ₂ during normal operation, the controller 4 switches the switches S1 and S2 to the terminal a.
To stop the discharge and turn on the light emitting diode 3 to indicate that the charging / discharging system 5 is in a resting state. This rest time is a preset time T ₃ .

When the time T ₃ elapses, the controller 4 starts the constant voltage / constant current power supply 1 to start the next normal operation.

Then, the normal operation described above is repeated N times.

When the normal operation is repeated N times, the controller 4
Perform capacity test operation. Here, this capacity test operation is
Charging time T ₄ , charging end voltage V ₃ and rest time T ₅ ,
Only T ₆ is different from the normal operation described above, and other operations are the same as the normal operation, and therefore the description thereof will be omitted.

Assuming that one cycle of the capacity test operation after N normal operations as described above is one cycle, the controller 4
Indicates that all the operations have been completed by applying a voltage to the light emitting diode D4 to turn it on when the operation of a predetermined number of cycles is completed.

Thereafter, the user reads the discharge time T in the capacity test operation from the change with time of the inter-terminal voltage v of the secondary battery 2 recorded by the XY recorder 6 and reads i ₂ × T for each cycle. = C [AH] is calculated to create the life characteristic curve shown in FIG.

The user determines the performance of the secondary battery 2 by using the discharge characteristics and the life characteristics during the capacity test operation for each cycle obtained as described above.

[0016]

As described above, in the conventional example, the inter-terminal voltage v of the secondary battery 2 is recorded by the XY recorder 6 every moment. However, although the information required by the user is the discharge characteristics during the capacity test operation for each cycle, in the above conventional example, the results of all the operations (normal operation and capacity test operation) are XY recorder 6. Will be recorded by. For this reason, in the above-mentioned conventional example, there is a problem that useless recording paper for recording the terminal voltage v during normal operation is required.

Further, in the above-mentioned conventional example, the user creates the life characteristics after the completion of all the preset cycles. For this reason, the test period must be set longer than the expected life of the secondary battery,
Further, there is a problem that the user cannot know at what point in time the performance of the secondary battery 2 is significantly reduced until after all cycles are completed.

The object of the present invention is to print out only the discharge characteristics required by the user, and
It is an object of the present invention to provide a control device for a charge / discharge system capable of obtaining life characteristics in real time.

[0019]

As a first means for printing out only discharge characteristics, the present invention is to charge a rechargeable secondary battery after charging until a predetermined charging condition is satisfied. In a control device of a charging / discharging system, which repeats an operation of starting discharge and discharging at a predetermined current until a predetermined discharge condition is satisfied, a terminal voltage of the secondary battery is measured and stored at predetermined intervals during the discharge period. It is characterized by comprising a voltage measuring means and a recording means for recording the temporal change of the terminal voltage of the secondary battery on the recording medium based on the memory of the voltage measuring means.

In addition, according to the present invention, as a second means for obtaining the life characteristics in real time, after charging a rechargeable secondary battery until a predetermined charging condition is satisfied,
In a control device of a charging / discharging system that repeats an operation of starting discharge and discharging at a predetermined current for a discharge period until a predetermined discharge condition is satisfied, discharge period measuring means for measuring the discharge period, the discharge period and the discharge current. And a life characteristic creating means for plotting the output of the multiplying means for each discharge period.

[0021]

According to the first means, the voltage measuring means measures and stores the inter-terminal voltage of the secondary battery during the discharging period at predetermined intervals. Then, based on the memory of the voltage measuring means, the recording means records the discharge characteristic on the recording medium.

According to the second means, the discharge period measuring means measures the discharge period, and the multiplying means multiplies the measured discharge period by the discharge current. Then, the life characteristic creating means plots the result for each discharge period to create a life characteristic curve in real time.

[0023]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, and the same reference numerals as those in FIG. 4 denote the same elements. Here, the CPU 11 controls the entire charge / discharge system 5 according to a program stored in the ROM 12 which will be described later. 13 is the light emitting diode D1 to D1 shown in FIG.
A display comprising D4 and resistors R1 to R4, 14 is a work RAM, 15 is a printer, and 16 is a keyboard for inputting a set voltage, a rest time, etc. to the CPU 11.

The CPU 11 detects the voltage v between the terminals of the secondary battery 2 by using the voltage detectors provided in the constant voltage constant current power source 1 and the constant current load device 3.

Next, the operation of this embodiment configured as described above will be described with reference to the flow charts of FIGS. 2 and 3.

In FIG. 2, first, the user inputs the test conditions into the CPU 11 using the keyboard 16 (step S1). That is, the voltage v ₁ at which the constant voltage / constant current power supply 1 shifts from the constant current mode to the constant voltage mode, the discharge end voltage v ₂ during the normal operation, the discharge end voltage v ₃ during the capacity test operation, and the constant voltage constant current power supply 1 constant. Charge current i in current mode
₁ , discharge current -i ₂ by constant current load device 3, charging time T ₁ and rest time T ₂ and T ₃ in normal operation, charging time T ₄ and rest time T ₅ in capacity test operation,
T _6, the number N of normal operation, N times of normal use the number A capacitive test operation performed in advance driver sets using the keyboard 16 before starting the test.

In step S2, the number of cycles (number of cycles) of the capacity test this time is set.

In step S3, the normal operation shown in FIG. 5 is repeated N times. Since the operation at this time is the same as the conventional one, its explanation is omitted.

Next, the capacity test operation is started, and after charging for T ₄ hours (step S4), it is stopped for T ₅ hours (step S5).

In step S6, the discharge start time t ₁ for measuring the discharge time T is measured and written.

In step S7, a capacity test (recording of discharge characteristics) described later is performed.

In step S8, the discharge test end time t ₂
Measure and write.

In step S9, the discharge characteristic is recorded by the printer 15 according to the result of step S7.

In step S10, the discharge start time t ₁ ,
From discharge end time t ₂ and discharge current i ₂ C = (t ₂ −
Calculate t ₁ ) × i ₂ [A · H].

In step S11, n-C is calculated from the calculation result C in step S9 and the number of times n set in step S2.
The characteristics are recorded by the printer 15.

In step S12, the capacity test operation is terminated after a lapse of T ₅ hours.

The above steps S2 to S11 are repeated a predetermined number of times A to end all the programs (step S13).

Next, the program for the capacity test of step S7 in the above flow chart will be described with reference to the flow chart of FIG.

When the capacity test is started, step S71 is started.
Sets the interrupt processing interval T _int .

Next, in step S72, the switch S
1, S2 is connected to the terminal b, and the secondary battery 2 is discharged with the current i ₂ .

This discharge is continued until the terminal voltage v of the secondary battery 2 reaches the discharge end voltage v ₃ (step S7).
3), when the discharge end voltage v ₃ is reached, the switch S1,
The terminal S is connected to S2 (step S74), and the process returns to the main program.

During the above discharge period, the terminal voltage v and the time t are measured at a constant interval T _int (step S7).
5) is stored (step S76).

As described above, according to this embodiment,
Only the discharge characteristics and life characteristics required by the user can be obtained in real time during the test period of the secondary battery.

Since the CPU 11 controls the printer 15 to print out the stored data in this embodiment, the printout is graduated, the axis unit is changed, and comments such as various parameters are written. Printing out with the data can be easily achieved.

[0046]

As described above, according to the present invention, only the discharge characteristic can be printed out and the life characteristic can be obtained in real time.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

FIG. 2 is a flowchart showing a main program to be executed by a CPU shown in FIG.

FIG. 3 is a flow chart showing a program of a subroutine in the main program of FIG.

FIG. 4 is a block diagram showing a configuration of a conventional charge / discharge system.

FIG. 5 is an explanatory diagram of the operation of the charge / discharge system.

FIG. 6 is a life characteristic diagram of a secondary battery.

[Explanation of symbols]

 1 Constant Voltage Constant Current Power Supply 2 Secondary Battery 3 Constant Current Load Device 5 Charge / Discharge System 11 CPU 12 ROM 13 Display 14 RAM 15 Printer 16 Keyboard

Claims (2)

[Claims] 1. A rechargeable secondary battery is charged until a predetermined charge condition is satisfied, and then discharge is started, and a discharge period of a predetermined current until a predetermined discharge condition is satisfied is repeatedly discharged. In a control device for a charging / discharging system, voltage measuring means for measuring and storing the terminal voltage of the secondary battery at predetermined intervals during the discharging period, and terminal voltage of the secondary battery based on the memory of the voltage measuring means. And a recording means for recording the temporal change of the recording medium on a recording medium. 2. A rechargeable secondary battery is charged until a predetermined charge condition is satisfied, and then discharge is started and a discharge period is discharged at a predetermined current until a predetermined discharge condition is satisfied. In a control device for a charging / discharging system, a discharge period measuring means for measuring the discharge period, a multiplying means for multiplying the discharge period and the discharge current, and a life characteristic for plotting an output of the multiplying means for each discharge period. A charging / discharging system control device comprising: a creating unit.