JP2015161519A - System and method for rechargeable battery degradation determination - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rechargeable battery degradation determination system capable of easily determining the degradation of a rechargeable battery.SOLUTION: A rechargeable battery degradation determination system 11 includes: a display part 18; a battery rechargeable part 13 for supplying a DC voltage of a predetermined voltage value to a rechargeable battery 12 in order to perform the charging of the rechargeable battery 12; a voltage measurement part 14 for measuring a charging voltage value being a value of the voltage of the rechargeable battery 12 during a charging period of the rechargeable battery 12 by the battery rechargeable part 13; and a control part 15. The control part 15 allows the display part 18 to perform a display showing the degradation of the rechargeable battery 12 if the charging voltage value measured by the voltage measurement part 14 is larger than a predetermined threshold value after the elapse of time from the time when the charging voltage value measured by the voltage measurement part 14 reaches a predetermined degradation determination start charging voltage value by predetermined degradation determination time.

Description

  The present invention relates to a rechargeable battery deterioration determination system and a rechargeable battery deterioration determination method for determining deterioration of a rechargeable battery.

  If the rechargeable battery is repeatedly charged, the charge capacity of the rechargeable battery decreases due to deterioration of the rechargeable battery, and the time for which the rechargeable battery can be used decreases.

  Techniques for determining such deterioration of a rechargeable battery are known.

  For example, Patent Document 1 stores the internal resistance value of the battery 2 obtained from the current-voltage characteristics created from the current value and voltage value measured when the battery 2 is discharged, and the storage device 9. In addition, there is disclosed a technique for determining the degree of deterioration of the battery 2 by comparing each internal resistance value of the battery when not in use and at the end of its life.

  Further, in Patent Document 2, since the change of the terminal voltage appears with a delay with respect to the increase amount of the charging / discharging current of the battery 13, the charging after the time when the slope value indicating the change rate of the terminal voltage is reduced to a predetermined value is performed. A technique for determining the deterioration of the battery 13 based on an internal resistance obtained from a current and a terminal voltage is disclosed.

  Patent Document 3 discloses a technique for determining deterioration of the secondary battery 20 by comparing the measured correction value of the impedance value of the secondary battery 20 with a reference impedance value.

  As a rechargeable battery-related technique, Patent Document 4 discloses a technique for displaying information such as charging station time or usable time in the rechargeable battery when the rechargeable battery of the imaging device 100 is charged or discharged. Yes.

  In Patent Document 5, the remaining amount Qr of the rechargeable battery 1 is subtracted from the dischargeable capacity Qa obtained by correcting the reference discharge capacity of the rechargeable battery 1 by subtracting the discharge amount value Qn obtained by integrating the discharge amount from full charge to the present. Has been disclosed.

JP 2001-228226 A JP 2002-252901 A JP 2013-083522 A JP 2005-110371 A JP 2002-063944 A

  However, the techniques described in Patent Documents 1 and 2 described above have a problem in that means for measuring each of the current value and the voltage value is necessary.

  Moreover, the technique described in Patent Document 3 has a problem that an impedance measuring instrument for measuring the impedance of the rechargeable battery is required.

  Note that neither of Patent Documents 4 and 5 describes a technique for determining deterioration of a rechargeable battery.

  The objective of this invention is providing the rechargeable battery deterioration determination system and the rechargeable battery deterioration determination method which solved the problem mentioned above.

The first rechargeable battery deterioration determination system of the present invention is:
A display unit;
In order to charge the rechargeable battery, a charging unit that supplies a DC voltage of a predetermined voltage value to the rechargeable battery;
A voltage measuring unit that measures a charging voltage value that is a voltage value of the rechargeable battery during the charging of the rechargeable battery by the charging unit;
When the charging voltage value measured by the voltage measuring unit reaches a predetermined deterioration determination start charging voltage value and when a predetermined deterioration determination time elapses, the charging voltage value measured by the voltage measuring unit is predetermined. A control unit that causes the display unit to display the deterioration of the rechargeable battery.

Furthermore, the second rechargeable battery deterioration determination system of the present invention is:
A display unit;
A load unit supplied with power from the rechargeable battery;
A voltage measuring unit that measures a discharge voltage value that is a voltage value of the rechargeable battery during a period in which the rechargeable battery supplies power to the load unit;
The discharge voltage value measured by the voltage measurement unit when the discharge voltage value measured by the voltage measurement unit reaches a predetermined deterioration determination start discharge voltage value and a predetermined deterioration determination time has elapsed is predetermined. A control unit that causes the display unit to display the deterioration of the rechargeable battery.

Moreover, the first rechargeable battery deterioration determination method of the present invention includes:
A charging voltage value, which is a value of the voltage of the rechargeable battery, is measured during charging of the rechargeable battery, and a first determination is made as to whether or not the charging voltage value has reached a predetermined deterioration determination start charging voltage value. Steps,
The charge voltage value measured when a predetermined deterioration determination time has elapsed from the time when it is determined that the charge voltage value has reached the deterioration determination start charge voltage value in the first step is a predetermined threshold voltage value. A second step of determining whether it is greater than,
And a third step in which the display unit displays a display indicating the deterioration of the rechargeable battery when it is determined in the second step that the charging voltage value is larger than the threshold voltage value.

Furthermore, the second rechargeable battery deterioration determination method of the present invention includes:
During the period in which the rechargeable battery supplies power to the load unit, a discharge voltage value, which is the voltage value of the rechargeable battery, is measured, and whether or not the discharge voltage value has reached a predetermined deterioration determination start discharge voltage value A first step of determining whether or not
The discharge voltage value measured when a predetermined deterioration determination time has elapsed from the time when it is determined that the discharge voltage value has reached the deterioration determination start discharge voltage value in the first step is a predetermined threshold voltage value. A second step of determining whether or not
And a third step in which the display unit displays a display indicating the deterioration of the rechargeable battery when it is determined in the second step that the discharge voltage value is greater than the threshold voltage value.

  The present invention has an effect that it is possible to easily determine the deterioration of the rechargeable battery only by measuring the value of the voltage of the rechargeable battery being charged or discharged.

It is a block diagram which shows 1st Embodiment. It is a flowchart which shows the deterioration determination process in the control part 15 which concerns on 1st Embodiment. It is a figure which shows the charge voltage curve of a comparatively new rechargeable battery (new rechargeable battery), and the charge voltage curve of a deteriorated rechargeable battery (deteriorated rechargeable battery). It is a block diagram which shows 2nd Embodiment. It is a flowchart which shows the deterioration determination process in the control part 35 which concerns on 2nd Embodiment. It is a figure which shows the discharge voltage curve of a comparatively new rechargeable battery (new rechargeable battery), and the discharge voltage curve of a deteriorated rechargeable battery (deteriorated rechargeable battery).

  Next, the present invention will be described in detail with reference to the drawings.

<First Embodiment>
First, a first embodiment of the present invention will be described.

  FIG. 1 is a block diagram showing this embodiment.

  Referring to FIG. 1, the present embodiment includes a rechargeable battery deterioration determination system 11, an alternating current (AC) adapter 20 connected to a commercial power source (not shown), and a rechargeable battery 12.

  The rechargeable battery deterioration determination system 11 includes a charging unit 13, a voltage measuring unit 14, a control unit 15, a deterioration degree display unit 18, and a rechargeable battery mounting unit 25.

  When the AC adapter 20 is connected to a commercial power supply, it supplies DC power to the charging unit 13 via a positive (plus) polar line and a negative (minus) polar line.

  The rechargeable battery 12 is, for example, a lithium ion battery or the like, and can be attached to the rechargeable battery attachment portion 25 or removed from the rechargeable battery attachment portion 25.

  The charging unit 13 applies a DC voltage having a predetermined voltage value to the rechargeable battery 12 attached to the rechargeable battery mounting unit 25 via the positive electrode line 21 and the negative electrode line 22 based on the DC power supplied from the AC adapter 20. The rechargeable battery 12 is charged by applying between the positive electrode terminal and the negative electrode terminal.

  Further, the charging unit 13 supplies and stops the supply of a DC voltage between the positive electrode line 21 and the negative electrode line 22 according to an instruction from the control unit 15.

  The voltage measurement unit 14 constantly measures the value of the voltage between the positive electrode line 21 and the negative electrode line 22, and transmits a signal indicating the measured value to the control unit 15 via the measurement voltage value signal line 23 as a measurement voltage value signal. .

  FIG. 3 is a diagram illustrating a charging voltage curve of a relatively new rechargeable battery (new rechargeable battery) and a charging voltage curve of a deteriorated rechargeable battery (deteriorated rechargeable battery).

  The charging voltage curve shows the relationship between the charging time of the rechargeable battery and the charging voltage value of the rechargeable battery.

  As shown in FIG. 3, the charging voltage value of the deteriorated rechargeable battery increases faster than that of the new rechargeable battery. This is because in the deteriorated rechargeable battery, the resistance value of the internal resistance of the deteriorated rechargeable battery is higher than that of the new rechargeable battery due to repeated charging.

  Next, the operation of this embodiment will be described.

  FIG. 2 is a flowchart showing the deterioration determination process in the control unit 15.

  Now, it is assumed that the rechargeable battery 12 is attached to the rechargeable battery attachment portion 25.

  First, when the alternating current (AC) adapter 20 is connected to a commercial power supply, the control unit 15 transmits a voltage supply stop signal to the charging unit 13 via the control line 26, and in response to the voltage supply stop signal, The charging unit 13 stops the supply of DC voltage between the positive electrode line 21 and the negative electrode line 22.

  Thereafter, the control unit 15 receives the measurement voltage value signal from the voltage measurement unit 14 via the voltage value signal line 23. Thus, the measurement voltage indicated by the measurement voltage value signal received from the voltage measurement unit 14 by the control unit 15 when the charging unit 13 stops the supply of the DC voltage between the positive electrode line 21 and the negative electrode line 22. The value is the value of the charging voltage of the rechargeable battery 12 at that time (charging voltage value).

  The control unit 15 confirms whether or not the measured voltage value indicated by the received measured voltage value signal is higher than a predetermined deterioration determination start charging voltage value V1 (step S65 in FIG. 2).

  If measured voltage value is higher than deterioration determination start charging voltage value V1 (YES in step S65), control unit 15 transmits a voltage supply start signal to charging unit 13 via control line 26. In response to the voltage supply start signal, the charging unit 13 starts supplying DC voltage to the rechargeable battery 12 via the positive line 21 and the negative line 22 (step S66).

  On the other hand, if measured voltage value is equal to or lower than deterioration determination start charge voltage value V1 (NO in step S65), control unit 15 further confirms whether or not the measured voltage value is equal to deterioration determination start charge voltage value V1. (Step S67).

If the measured voltage value is equal to deterioration determination start charging voltage value V1 (YES in step S67), control unit 15 transmits a voltage supply start signal to charging unit 13 via control line 26, and charging unit 13 is charged. While the supply of the DC voltage to the battery 12 is started, the timing operation is started. (Step S68)
Thereafter, the control unit 15 counts the deterioration determination time indicated by the predetermined deterioration determination time value Tc (step S69).

  The control unit 15 transmits a voltage supply stop signal to the charging unit 13 via the control line 26 and causes the charging unit 13 to stop supplying the DC voltage to the rechargeable battery 12, and then measured by the voltage measuring unit 14. A measurement voltage value signal indicating the measured voltage value is received (step S70).

  The control unit 15 compares the measured voltage value indicated by the measured voltage value signal received in step S70 with a predetermined threshold voltage value Vct for determining the degree of deterioration (step S71).

  If the measured voltage value is greater than threshold voltage value Vct (YES in step S71), control unit 15 determines that rechargeable battery 12 has deteriorated, and a deterioration degree display part via deterioration degree information signal line 24. 18 is displayed to indicate the deterioration of the rechargeable battery 12 (step S72A).

  And the control part 15 transmits a voltage supply start signal to the charging part 13 via the control line 26, and makes the charging part 13 start supply of the DC voltage to the rechargeable battery 12 (step S72B).

  In step S71, if the measured voltage value is equal to or lower than threshold voltage value Vct (NO in step S71), control unit 15 transmits a voltage supply start signal to charging unit 13 via control line 26, and charging unit 13 To start supplying DC voltage to the rechargeable battery 12 (step S73).

  On the other hand, if the measured voltage value is not equal to deterioration determination start charging voltage value V1 in step 67 (NO in step S67), control unit 15 transmits a voltage supply start signal to charging unit 13 via control line 26. Then, the charging unit 13 is started to supply a DC voltage to the rechargeable battery 12 (step S74A).

  The control unit 15 transmits a voltage supply stop signal to the charging unit 13 via the control line 26 when a short predetermined time has elapsed from the start of the supply of the DC voltage. (Step S74B).

  The control unit 15 receives the measurement voltage value signal indicating the measurement voltage value measured by the voltage measurement unit 14 after causing the charging unit 13 to stop the supply of the DC voltage to the rechargeable battery 12 (step S74C). Then, the process after step S65 is performed.

  As described above, the present embodiment has an effect that it is possible to easily determine the deterioration of the rechargeable battery only by measuring the charge voltage value of the rechargeable battery being charged.

  This is because the charging voltage value at the time when the predetermined deterioration determination time has elapsed after reaching the predetermined charging voltage value is compared with the predetermined threshold voltage value.

<Second Embodiment>
Next, a second embodiment of the present invention will be described.

  FIG. 4 is a block diagram showing this embodiment.

  Referring to FIG. 4, the present embodiment includes a rechargeable battery deterioration determination system 31 and a rechargeable battery 32.

  The rechargeable battery deterioration determination system 31 includes a load unit 33, a voltage measurement unit 34, a control unit 35, a deterioration degree display unit 38, and a rechargeable battery attachment unit 45.

  The rechargeable battery 32 is, for example, a lithium ion battery or the like, and can be attached to the rechargeable battery attachment portion 45 or removed from the rechargeable battery attachment portion 45. The rechargeable battery 32 supplies DC power to the rechargeable battery deterioration determination system 31 via the positive electrode line 41 and the negative electrode line 42 from between the positive electrode terminal and the negative electrode terminal of the rechargeable battery 32.

  The load unit 33 is various electronic circuits or the like provided in an electronic device that consumes power supplied from the rechargeable battery 32. Note that the voltage measurement unit 34, the control unit 35, and the deterioration level display unit 38 also consume power supplied from the rechargeable battery 32.

  The voltage measuring unit 34 constantly measures the value of the voltage between the positive electrode line 41 and the negative electrode line 42 and transmits a signal indicating the measured value to the control unit 35 via the measured voltage value signal line 43 as a measured voltage value signal. .

  FIG. 6 is a diagram illustrating a discharge voltage curve of a relatively new rechargeable battery (new rechargeable battery) and a discharge voltage curve of a deteriorated rechargeable battery (deteriorated rechargeable battery).

  The discharge voltage curve shows the relationship between the discharge time of the rechargeable battery and the discharge voltage value of the rechargeable battery.

  As shown in FIG. 6, the discharge voltage value of the deteriorated rechargeable battery decreases faster than that of the new rechargeable battery. This is because in the deteriorated rechargeable battery, the resistance value of the internal resistance of the deteriorated rechargeable battery is higher than that of the new rechargeable battery due to repeated charging.

  Next, the operation of this embodiment will be described.

  FIG. 5 is a flowchart showing the deterioration determination process in the control unit 35.

  Now, it is assumed that the rechargeable battery 32 is attached to the rechargeable battery attachment portion 45.

  First, the control unit 35 receives a measurement voltage value signal from the voltage measurement unit 34 via the measurement voltage value signal line 43.

  Here, the measurement voltage value indicated by the measurement voltage value signal received by the control unit 35 from the voltage measurement unit 34 is the value of the discharge voltage (discharge voltage value) of the rechargeable battery 32 at that time.

  The control unit 35 checks whether or not the measured voltage value indicated by the received measured voltage value signal is lower than a predetermined deterioration determination start discharge voltage value V2 (step S86).

  If the measured voltage value is lower than deterioration determination start discharge voltage value V2 in step S86 (YES in step S86), control unit 35 ends the deterioration determination process.

  If the measured voltage value is greater than or equal to deterioration determination start discharge voltage value V2 in step S86 (NO in step S86), control unit 35 further determines whether or not the measured voltage value is equal to deterioration determination start discharge voltage value V2. Is confirmed (step S87).

  If the measured voltage value is not equal to the deterioration determination start discharge voltage value V2 in step 87 (NO in step S87), control unit 35 repeats the comparison process in step S87 until they become equal.

  If the measured voltage value is equal to deterioration determination start discharge voltage value V2 (YES in step S87), control unit 35 starts a time measuring operation (step S88).

  Thereafter, the control unit 35 measures time for a deterioration determination time indicated by a predetermined deterioration determination time value Td (step S89).

  The control unit 35 checks whether or not the measured voltage value indicated by the measured voltage value signal received from the voltage measuring unit 34 at that time is lower than a predetermined threshold voltage value Vdt for determining the degree of deterioration (step S92). .

  If the measured voltage value is lower than threshold voltage value Vdt (YES in step S92), control unit 35 determines that rechargeable battery 32 has deteriorated, and a deterioration degree display part via deterioration degree information signal line 44. 38 is displayed to indicate the deterioration of the rechargeable battery 32 (step S93).

  If the measured voltage value is greater than or equal to threshold voltage value Vdt in step S92 (NO in step S92), control unit 35 ends the deterioration determination process.

  As described above, this embodiment has an effect that it is possible to easily determine the deterioration of the rechargeable battery only by measuring the discharge voltage value of the rechargeable battery during discharge.

  This is because the discharge voltage value at the time when the predetermined deterioration determination time has elapsed after reaching the predetermined discharge voltage value is compared with the predetermined threshold voltage value.

DESCRIPTION OF SYMBOLS 11 Rechargeable battery deterioration determination system 12 Rechargeable battery 13 Charging part 14 Voltage measurement part 15 Control part 18 Deterioration degree display part 20 AC adapter 21 Positive electrode line 22 Negative electrode line 23 Measurement voltage value signal line 24 Deterioration degree information signal line 25 Rechargeable battery attachment part 26 control line 31 rechargeable battery deterioration determination system 32 rechargeable battery 33 load unit 34 voltage measurement unit 35 control unit 38 deterioration degree display unit 41 positive electrode line 42 negative electrode line 43 measured voltage value signal line 44 deterioration degree information signal line 45 rechargeable battery attachment unit

Claims (6)

A display unit;
In order to charge the rechargeable battery, a charging unit that supplies a DC voltage of a predetermined voltage value to the rechargeable battery;
A voltage measuring unit that measures a charging voltage value that is a voltage value of the rechargeable battery during the charging of the rechargeable battery by the charging unit;
When the charging voltage value measured by the voltage measuring unit reaches a predetermined deterioration determination start charging voltage value and when a predetermined deterioration determination time elapses, the charging voltage value measured by the voltage measuring unit is predetermined. And a control unit that causes the display unit to display the deterioration of the rechargeable battery if it is greater than the threshold voltage value. Measurement of the charging voltage value by the voltage measuring unit is performed when the charging unit has stopped supplying the DC voltage to the rechargeable battery,
The charging unit temporarily supplies the DC voltage to the rechargeable battery every time a predetermined time elapses until the charging voltage value measured by the voltage measuring unit reaches the deterioration determination start voltage value. The supply to the rechargeable battery at the time when the deterioration determination time has elapsed from the time when the charging voltage value measured by the voltage measurement unit reaches the deterioration determination start voltage value. The rechargeable battery deterioration determination system according to claim 1, wherein the supply of the DC voltage is temporarily stopped after the supply of the DC voltage is temporarily stopped. A display unit;
A load unit supplied with power from the rechargeable battery;
A voltage measuring unit that measures a discharge voltage value that is a voltage value of the rechargeable battery during a period in which the rechargeable battery supplies power to the load unit;
The discharge voltage value measured by the voltage measurement unit when the discharge voltage value measured by the voltage measurement unit reaches a predetermined deterioration determination start discharge voltage value and a predetermined deterioration determination time has elapsed is predetermined. And a control unit that causes the display unit to display the deterioration of the rechargeable battery if it is smaller than the threshold voltage value. A charging voltage value, which is a value of the voltage of the rechargeable battery, is measured during charging of the rechargeable battery, and a first determination is made as to whether or not the charging voltage value has reached a predetermined deterioration determination start charging voltage value. Steps,
The charge voltage value measured when a predetermined deterioration determination time has elapsed from the time when it is determined that the charge voltage value has reached the deterioration determination start charge voltage value in the first step is a predetermined threshold voltage value. A second step of determining whether it is greater than,
And a third step in which the display unit performs a display indicating the deterioration of the rechargeable battery when it is determined in the second step that the charging voltage value is larger than the threshold voltage value. Rechargeable battery deterioration determination method. In the first step, each time a predetermined time elapses until the charging voltage value reaches the deterioration determination start charging voltage value, the charging of the rechargeable battery is temporarily stopped, and then charging is resumed.
In the second step, at the time when the deterioration determination time has elapsed from the time when the charging voltage value reaches the deterioration determination start charging voltage value, charging is resumed after temporarily stopping charging of the rechargeable battery. ,
The rechargeable battery deterioration determination method according to claim 4, wherein the measurement of the charging voltage value is performed when charging of the rechargeable battery is stopped. During the period in which the rechargeable battery supplies power to the load unit, a discharge voltage value, which is the voltage value of the rechargeable battery, is measured, and whether or not the discharge voltage value has reached a predetermined deterioration determination start discharge voltage value A first step of determining whether or not
The discharge voltage value measured when a predetermined deterioration determination time has elapsed from the time when it is determined that the discharge voltage value has reached the deterioration determination start discharge voltage value in the first step is a predetermined threshold voltage value. A second step of determining whether or not
And a third step in which the display unit performs a display indicating the deterioration of the rechargeable battery when it is determined in the second step that the discharge voltage value is larger than the threshold voltage value. Rechargeable battery deterioration determination method.

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