JPH09329654A - Life judgement method for lead battery and life judgement equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize accurate judgement, by judging the life of a lead battery on the basis of measured open-circuit voltage, charge expiration voltage, and discharge expiration voltage. SOLUTION: A power supply part 1 to be connected to a commercial power source, a charging part 2 which is connected to a terminal of a lead battery 6 and charges it, a discharging part 3 which is connected to a terminal of the lead battery 6 and discharges power, and a voltage measurement part 4 which measures the terminal voltage of the lead battery 6 are installed. An open-circuit voltage of the lead battery 6 before charge is measured, the lead battery 6 is charged for a specific period, a charge expiration voltage at the time of charge expiration is measured, a specific pause period is given after charge expiration, discharge is continued for a specific period after expiration of the pause period, and a discharge expiration voltage is measured at the time of discharge expiration. A control part 5 operates the capacity of the lead battery 6 and judges the life by using a constant which is previously and experimentally obtained, and a double regression method wherein the measured open- circuit voltage, charge expiration voltage and discharge expiration voltage are multiplied by the constant and added. Thereby accurate judgement of the life and the degree of life is enabled.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a lead storage battery used in an electric vehicle or a hybrid electric vehicle,
The present invention relates to a lead-acid battery life determining method and a life determining apparatus that determine the life based on the measured open circuit voltage, charge end voltage, and discharge end voltage.

[0002]

2. Description of the Related Art A conventional method for detecting the remaining capacity of a lead storage battery (Japanese Patent Laid-Open No. 63-157078) charges a lead storage battery for starting a vehicle, and the capacity of the lead storage battery when fully charged is 50 times the initial capacity.
The life of the lead storage battery was judged by whether it was less than or equal to the percentage.

Further, in a conventional storage battery capacity and life determining method (Japanese Patent Laid-Open No. Sho 60-195467), as shown in FIG. 10, a storage battery for an automobile is charged and discharged by an on-vehicle charging device and a load, and a charging voltage and a discharging voltage are compared. When the voltage difference exceeded the specified value, it was judged as the life.

A conventional storage battery life determining apparatus (Japanese Patent Laid-Open No. 3-289575) measures the output voltage and current of the storage battery during idling operation after a fixed time of engine startup or during predetermined steady rotation operation of the engine. Was used to determine the life of the storage battery.

[0005]

The above-mentioned conventional method for detecting the remaining capacity of the lead storage battery detects the capacity of the lead storage battery when fully charged to 50% or less of the initial capacity and determines the life of the lead storage battery. Since it is a judgment, there is a problem that it cannot be used for judging the life of a lead storage battery for an electric vehicle.

Further, in the above conventional storage battery capacity and life determining method, when the initial capacity is 50% or less, a significant difference occurs in the internal resistance. If the voltage difference from the discharge voltage exceeds the specified value, it is determined that the battery has reached the end of its service life. Therefore, there is a problem that it cannot be used to determine the service life of lead acid batteries for electric vehicles.

Further, in a method for determining the life of a lead battery for an electric vehicle or a hybrid electric vehicle, the capacity when a lead storage battery is charged and fully charged is 60 to 80 which is the initial capacity.
Since it is required to determine the degree of life in the range of percentage, there is a problem that it is not possible to accurately determine the lifetime and the degree of life due to variations in the lead storage battery.

Further, the above-mentioned conventional battery life determining device is
Since the life of the storage battery is determined by measuring the output voltage and current of the storage battery during idling operation after the engine has been started for a certain period of time or during predetermined steady rotation operation of the engine, determine the degree of life. In addition, there is a problem that the life of the storage battery cannot be determined unless the engine is operated because the device is powered by the battery.

[0009] Therefore, the present inventors, the first technique of the present invention to determine the life of the lead storage battery used in the electric vehicle or the hybrid electric vehicle based on the measured open circuit voltage, charge end voltage, and discharge end voltage. In addition to the above idea, the capacity of the lead storage battery is calculated according to a multiple regression equation in which the measured open circuit voltage, charge end voltage, and discharge end voltage are multiplied by a coefficient and added.
Focusing on the second technical idea of the present invention that the degree of life is judged by displaying it in the range of 0%, and further research and development has resulted in accurate life and life of lead acid batteries for electric vehicles. The present invention has been achieved which achieves the purpose of enabling a degree determination.

[0010]

The lead-acid battery life determining method of the present invention (the first invention according to claim 1) measures the open-circuit voltage of the lead-acid battery before starting charging, and Charge for a fixed time, measure the charge end voltage at the end of charging, pause for a fixed time after the end of charging, discharge for a fixed time after the end of rest time, measure the discharge end voltage at the end of discharge, the measured open circuit voltage, The life of the lead storage battery is determined based on the charge end voltage and the discharge end voltage.

The lead-acid battery life determining method of the present invention (the second invention according to claim 2) is the lead-acid battery determined in the first invention based on the measured open circuit voltage, charge end voltage and discharge end voltage. The capacity of the storage battery is 60 with respect to the initial capacity.
The life is determined by determining the capacity within the range of 110%.

According to the lead-acid battery life determining method of the present invention (the third invention according to claim 3), in the first invention, the lead-acid battery is fully charged before starting charging, and the lead-acid battery is fully charged. A method for determining the life of a lead storage battery, which is characterized by measuring an open circuit voltage.

In the lead-acid battery life judging method of the present invention (the fourth invention according to claim 4), in the second invention, the measured open circuit voltage, charge end voltage, and discharge end voltage are multiplied by a coefficient. The capacity of the lead storage battery is calculated according to the multiple regression equation that is added.

The lead storage battery life judging method of the present invention (the fifth invention according to claim 5) is obtained by experimentally determining the measured open circuit voltage, charge end voltage and discharge end voltage in the fourth invention. The above constant is multiplied as the coefficient.

The life determining device for a lead storage battery according to the present invention (sixth aspect of the present invention) is connected to a commercial power supply for outputting a required power supply voltage and a lead storage battery terminal. A charging unit for charging, a discharging unit connected to a terminal of the lead storage battery for discharging, a voltage measuring unit for measuring the terminal voltage of the lead storage battery, an open circuit voltage of the lead storage battery before starting charging, and a charging end. And a control unit that determines the life of the lead storage battery by calculating the capacity of the lead storage battery based on the charge end voltage at the time of discharge and the discharge end voltage at the end of discharge.

In the lead-acid battery life determining device of the present invention (the seventh invention according to claim 7), in the sixth invention, the control unit controls the charging time of the charging unit, the discharging time of the discharging unit, Also, it is provided with a computing means in which a rest time from charging to discharging and a measurement procedure are stored.

In the lead-acid battery life determining device of the present invention (the eighth invention according to claim 8), in the seventh invention, the control unit controls the measured open circuit voltage, charge end voltage, and discharge end voltage. Stored is a multiple regression equation that adds a constant obtained experimentally as a coefficient to be multiplied with the measured open circuit voltage, charge end voltage, and discharge end voltage for calculating the capacity of the lead storage battery by adding the constant. It is provided with the calculating means.

(Operation) According to the lead-acid battery life determining method of the first aspect of the present invention having the above-described structure, the open-circuit voltage of the lead-acid battery is measured before charging is started, the lead-acid battery is charged for a certain period of time, and the charging is terminated. Measure the charge end voltage, pause for a fixed time after the end of charge, discharge for a fixed time after the end of the rest time, measure the discharge end voltage at the end of discharge, to the measured open circuit voltage, charge end voltage, and discharge end voltage. Based on this, the life of the lead storage battery is determined.

According to the lead-acid battery life determining method of the second aspect of the present invention having the above-mentioned structure, in the first aspect of the present invention, the capacity of the lead-acid battery determined based on the measured open circuit voltage, charge end voltage and discharge end voltage is 60. The degree of life is determined by determining the capacity within the range of 110%.

In the lead-acid battery life determining method of the third aspect of the present invention, the lead-acid battery of the first aspect is fully charged before starting charging, and the open circuit voltage of the fully charged lead-acid battery is measured. After that, the lead acid battery is further charged for a certain period of time, the charging end voltage at the end of charging is measured, the charging is stopped for a certain period of time, the rest time is discharged for a certain period of time, and the discharging end voltage at the end of discharging is measured, The lead-acid battery life is measured based on the measured open circuit voltage, charge end voltage, and discharge end voltage.

In the lead-acid battery life determining method of the fourth aspect of the present invention having the above structure, in the second aspect of the present invention, a multiple regression equation is used in which the measured open circuit voltage, charge end voltage, and discharge end voltage are multiplied by a coefficient and added. According to the above, the capacity of the lead storage battery is calculated.

In the lead-acid battery life determining method of the fifth aspect of the present invention having the above-mentioned configuration, in the fourth aspect of the invention, constants experimentally obtained for the measured open circuit voltage, charge end voltage and discharge end voltage are used as the coefficients. The capacity of the lead storage battery is calculated according to a multiple regression equation that is multiplied and added.

In the lead-acid battery life determining apparatus of the sixth aspect of the present invention having the above-mentioned configuration, the voltage measuring unit determines the open circuit voltage of the lead-acid battery before starting charging by the charging unit, and the end-of-charge period when charging by the charging unit is completed. A charge end voltage and a discharge end voltage at the end of discharge by the discharge unit are measured, and the capacity of the lead storage battery is based on the open circuit voltage of the lead storage battery measured by the control unit, the charge end voltage, and the discharge end voltage. Is calculated to determine the life of the lead storage battery.

According to the lead-acid battery life determining apparatus of the seventh invention having the above-mentioned structure, in the sixth invention, the control section is:
The charging time of the charging section stored in the computing means,
The voltage of the lead storage battery is measured according to the discharge time of the discharge part, the rest time after charging and until discharging, and the life of the lead storage battery is determined based on the measured voltage.

In the lead-acid battery life determining device of the eighth invention having the above structure, in the seventh invention, the control section is
The measured open circuit voltage stored in the computing means,
Charging end voltage, and a constant obtained experimentally as a coefficient to be multiplied with the discharge end voltage, the measured open circuit voltage,
The life of the lead storage battery is determined by calculating the capacity of the lead storage battery according to a multiple regression equation in which the constants are multiplied by the charge end voltage and the discharge end voltage and added.

[0026]

The method for determining the life of a lead storage battery according to the first aspect of the present invention, which has the above-described operation, determines the life of the lead storage battery based on the measured open circuit voltage, charge end voltage, and discharge end voltage. It is possible to accurately determine the life and the degree of the life of a lead storage battery for a hybrid electric vehicle.

In addition to the effect of the first aspect of the present invention, the method of determining the life of a lead acid battery of the second aspect of the present invention which has the above-described action has the capacity of the lead acid battery determined based on the measured open circuit voltage, charge end voltage, and discharge end voltage. However, since the degree of life is quantitatively determined depending on whether or not it has a capacity of 60 to 110% suitable for the capacity evaluation of the lead storage battery for electric vehicles, it is possible to determine the degree of life more accurately. Produce an effect.

In addition to the effect of the first aspect of the invention, the lead-acid battery life determining method of the third aspect of the present invention which has the above-mentioned operation has a highly accurate life because the lead acid battery is fully charged when the open circuit voltage is measured. You can make a decision.

In addition to the effect of the second aspect of the present invention, the lead-acid battery life determining method of the fourth aspect of the present invention, which has the above-described operation, adds the measured open circuit voltage, charge end voltage, and discharge end voltage by multiplying a coefficient. Since the capacity of the lead storage battery is calculated according to the multiple regression equation to determine the life, it is possible to more accurately determine the life and the degree of the life.

In addition to the effect of the fourth aspect of the present invention, the lead storage battery life determining method of the fifth aspect of the present invention which has the above-described action includes the experimentally obtained constants for the measured open circuit voltage, charge end voltage, and discharge end voltage. According to the multiple regression equation in which the coefficient is multiplied and added, the capacity of the lead storage battery is calculated and the life is determined. Therefore, it is possible to more accurately determine the life and the degree of the life.

In the lead-acid battery life determining apparatus of the sixth aspect of the present invention, which calculates the capacity of the lead-acid battery based on the open circuit voltage of the lead-acid battery, the charge end voltage and the discharge end voltage measured by the control unit. Since the life of the lead storage battery is determined by the above, it is possible to accurately determine the life of the lead storage battery for an electric vehicle and the degree of the life, and a power supply unit connected to a commercial power supply is required. Since the power supply voltage is output, it is possible to measure the lead acid battery alone.

In addition to the effect of the sixth aspect of the present invention, in the lead-acid battery life determining apparatus of the seventh aspect of the present invention which has the above-described operation, the control section causes the control section to store the charging time of the charging section and the discharging time. The discharge time of the part, and the rest time after charging, and the voltage of the lead storage battery is measured according to the measurement procedure, and the life of the lead storage battery is determined based on the measured voltage, so it is easy to change the measurement conditions. It has the effect of being flexible.

In addition to the effect of the seventh aspect of the present invention, the lead storage battery life determining apparatus of the eighth aspect of the present invention, which has the above-described effect, has a constant stored in the arithmetic means by the control section and a constant experimentally obtained in advance. The measured open circuit voltage, charge end voltage, and discharge end voltage are multiplied by the constants and added to the multiple regression formula to calculate the capacity of the lead storage battery to determine the life of the lead storage battery. And, it is possible to determine the degree of life.

[0034]

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

(First Embodiment) As shown in FIG. 1, a lead storage battery life determining apparatus and a lead storage battery life determining method according to a first embodiment of the present invention are connected to a commercial power source to output a required power source voltage. 1, a charging unit 2 that is connected to a terminal of the lead storage battery 6 for charging, a discharging unit 3 that is connected to a terminal of the lead storage battery for discharging, and a voltage measuring unit 4 that measures the terminal voltage of the lead storage battery 6. A controller that calculates the capacity of the lead storage battery 6 based on the open circuit voltage of the lead storage battery 6 before starting charging, the charging end voltage at the end of charging, and the discharge end voltage at the end of discharging to determine the life of the lead storage battery. 5 and.

As shown in FIG. 1, the power supply unit 1 includes a power supply breaker 11 connected to a commercial power supply, a power transformer 12 connected to the power supply breaker 11, and a rectifier connected to the power transformer 12 for rectification. 13 and an electronic circuit power supply 14 that is connected to the power supply breaker 11 and outputs a power supply voltage for the control unit 5.

The charging unit 2 is composed of a constant current circuit whose base current is controlled to 40 A as shown in FIG.

The discharge section 3 is composed of a constant current circuit whose base current is controlled to 800 A as shown in FIG.

The control unit 5 is composed of an MPU (microcomputer) 50 which stores in advance a procedure for determining the life of a lead storage battery as shown in FIG.
1 and a display unit 52.

The MP of the microcomputer 50
In U, the charging time (5 seconds) of the charging unit, the discharging time (5 seconds) of the discharging unit, the rest time (10 seconds) after discharging after charging, and the measurement procedure are stored. Experimentally determined constants (a, b, c, d) as coefficients for multiplying the measured open circuit voltage, charge end voltage, and discharge end voltage, and the measured open circuit voltage for calculating the capacity of the lead storage battery. , A charge end voltage, and a discharge end voltage are multiplied and added, and the multiple regression equation of the following equation 1 is stored.

[Equation 1]

According to the regression analysis results of 52 samples in the experiments conducted by the present inventors, it is the most accurate to determine the capacity% based on the voltage at the 5th second of charging, the voltage at 5th of discharging and the open circuit voltage. Was found to be high.

Moreover, in the multiple regression equation of the above-mentioned equation 1 which is an empirical equation, a constant a experimentally obtained from the above 52 samples is used as a coefficient for multiplying the measured open circuit voltage, charge end voltage and discharge end voltage. Is -21.3, the constant b is 17.5, the constant c is 3.92, and the constant term d is 62.4. When the above coefficient was set, the multiple correlation coefficient R was 0.9389 and the contribution rate R ² was 0.8815, as described later.

A procedure for determining the life of the lead storage battery in the first embodiment device will be described below with reference to FIG. First, the lead acid battery to be measured is fully charged.
Then, in step 101, the power breaker 1
The switch of No. 1 is turned on, the power of the apparatus is turned on, and in step 102, the battery of the lead storage battery is connected.

In step 103, the positive and negative polarities of the terminals of the connected battery are checked, and in step 104, if there is a connection abnormality,
Reconnect the battery terminals and take measures against leakage.

If normal, the battery voltage to be measured is checked for abnormalities, if the voltage is high, wait until the voltage drops, if the voltage is low, recharge, and if the voltage is normal, measure in step 107. The test starts.

In step 108, as shown in FIG. 3, the charge test, the pause, and the discharge test are performed according to the life determining method in the first embodiment. That is, the open circuit voltage of the battery before charging is measured, the battery is charged at 40 A for a fixed time (5 seconds), the charging end voltage at the end of charging is measured, and the fixed voltage (1
0 seconds), and after discharging the discharge time at 800A for a certain time (5 seconds), the discharge end voltage at the end of the discharge is measured, based on the measured open circuit voltage, charge end voltage, and discharge end voltage. The life of the lead storage battery is determined.

Using the open circuit voltage, the charge end voltage, and the discharge end voltage measured as described above, the constants experimentally obtained in advance are multiplied as the coefficient and added, and the weight shown in the equation 1 is added. The capacity of the lead storage battery is calculated according to the regression equation.

At step 109, the degree of deterioration of the battery is judged based on the capacity% of the lead storage battery calculated according to the multiple regression equation, and at step 110, the judgment result is displayed on the display section 52 and the device is reset. .

Next, the result of examining the accuracy of the measurement result by the life determining method and the life determining apparatus of the first embodiment will be described below. As is clear from FIG. 4, it is stable in about 5 seconds after the start of charging and the start of discharging,
From the viewpoint of speeding up the measurement, the voltage can be measured 5 seconds after the start of charging and the start of discharging.

Further, as is clear from FIG. 5, in order to accurately determine a good battery and a good battery from the voltage at the time of charging and discharging from the charging / discharging current-voltage characteristic curve of the battery, the charging current is 40A and the discharging is 40A. A current of about 800 A is sufficient.

As is clear from FIG. 6, the capacity% and the voltage after 5 seconds of discharge are the actual vehicle A, the actual vehicle B, and the actual vehicle and a new product (purchased from the correlation diagram of the 3-hour rate capacity% and the voltage at the 5th second discharge, which are actually measured. It was found from the measurement results of the four types (time condition) that there is a first-order correlation.

As is clear from FIG. 7, the capacity% and the voltage after 5 seconds of charging are the actual vehicle A, the actual vehicle B, and the actual vehicle and a new vehicle (purchased from the correlation diagram of the 3-hour rate capacity% and the voltage at the 5th second charge). The primary correlation could not be discriminated from the measurement results of the four types (time condition).

As is clear from FIG. 8, a correlation diagram of the 3% rate capacity% and the voltage increase at the charging 5th second, which is the difference between the voltage at the charging 5th second and the open circuit voltage, is found from the correlation diagram of the capacity% and the increase at the charging 5th second. It was found from the measurement results of the four types of the actual vehicle A, the actual vehicle B, and the actual vehicle and a new article (the state at the time of purchase) that the voltage has a first-order correlation.

Further, with respect to only the charging voltage, the charging voltage and the open circuit voltage, the discharging voltage only, the open circuit voltage and the discharging voltage, the open circuit voltage / the charging voltage and the discharging voltage, the coefficients of the multiple regression equation are set respectively, and in 52 samples. The results of obtaining the multiple correlation coefficient R and the contribution rate R ² for each are shown in Table 1 below.

[Table 1]

As is apparent from Table 1 above, it is best to calculate the multiple regression equations for the three factors of the open circuit voltage, the charging voltage and the discharging voltage adopted in the first embodiment, and the multiple correlation coefficient R is 0.9389, the contribution rate R
² was 0.8815.

The lead-acid battery life determining apparatus according to the first embodiment described above uses the capacity of the lead-acid battery 6 based on the open circuit voltage of the lead-acid battery 6, the charge end voltage, and the discharge end voltage measured by the controller 5. Since% is calculated to determine the life of the lead storage battery, it is possible to accurately determine the life of the lead storage battery for an electric vehicle and the degree of the life.

Further, since the lead-acid battery life determining apparatus of the first embodiment outputs the required power-supply voltage from the power source unit 1 connected to the commercial power source, the lead-acid battery 6 can be charged without starting the engine. This has the effect of enabling single measurement.

Further, the lead-acid battery life determining apparatus according to the first embodiment can continuously measure a plurality of batteries (16 to 24 cells / unit) mounted on the electric vehicle for each individual item, and It is possible to perform the measurement in a short time of about 1 minute per battery.

In the lead-acid battery life determining apparatus of the first embodiment, the control unit 5 discharges the charging time of the charging unit, the discharging time of the discharging unit and the discharging after charging which are stored in advance in the MPU. Since the voltage of the lead storage battery 6 is measured in accordance with the rest time and the measurement procedure, and the life of the lead storage battery 6 is determined based on the measured voltage, it is easy to change the measurement conditions and the effect of being flexible is obtained. Play.

Further, in the lead-acid battery life determining apparatus according to the first embodiment, the control unit 5 stores a constant experimentally stored in advance in the MPU, the measured open circuit voltage, charge end voltage, and According to the multiple regression formula of multiplying the discharge end voltage by the constant and adding it, the capacity of the lead storage battery is calculated, and the life of the lead storage battery is determined, which enables more accurate determination of the life and the degree of the life, and the capacity. 60 to 1
It is possible to quantitatively display up to 3 digits of 10%.

In the lead storage battery life determining method of the first embodiment, the lead storage battery life is determined based on the measured open circuit voltage, charge end voltage, and discharge end voltage. This has the effect of enabling accurate determination of the life and the degree of life of the lead acid battery.

Further, in the lead storage battery life determining method of the first embodiment, the lead storage battery is obtained based on the measured open circuit voltage, charge end voltage and discharge end voltage by fully charging the battery in advance before measurement. Since the capacity can be determined within the range of 60 to 110%, which is suitable for evaluating the capacity of lead-acid batteries for electric vehicles, it is possible to more accurately determine the life and the degree of the life even at around 80% of the initial capacity. Has the effect.

The lead storage battery life determining method according to the first embodiment employs an experimentally determined weight based on a number of samples obtained by multiplying the measured open circuit voltage, charge end voltage, and discharge end voltage by a coefficient and adding them. Since the capacity of the lead storage battery is calculated according to the regression equation to determine the life, it is possible to more accurately determine the life and the degree of the life.

Furthermore, the lead-acid battery life determining method according to the first embodiment is characterized by multiplying the measured open circuit voltage, charge end voltage, and discharge end voltage by a constant experimentally obtained from the above-mentioned many samples as the coefficient. According to the multiple regression equation to be added, the capacity% of the lead storage battery 6 is calculated to determine the life, so that it is possible to more accurately determine the life and the degree of the life.

The lead storage battery life determining method and life determining apparatus according to the first embodiment were obtained by a commercially available charge / discharge machine manufactured by Hokuto Denko, as is apparent from FIG. From the correlation diagram of the capacity% and the capacity% obtained by the life determining apparatus according to the first embodiment, ± 10% when the capacity is 60 to 100% of the initial capacity.
It is possible to perform measurement with the accuracy of 1 and to quantify with high accuracy.

The embodiments described above are merely examples for the purpose of explanation, and the present invention is not limited to them. Those skilled in the art will recognize from the claims, the detailed description of the invention and the description of the drawings. Modifications and additions can be made without departing from the technical idea of the present invention.

[Brief description of drawings]

FIG. 1 is a block circuit diagram showing a life determining device for a lead storage battery according to a first embodiment of the present invention.

FIG. 2 is a chart showing a procedure for determining the life of the lead storage battery according to the first embodiment.

FIG. 3 is a diagram showing a timing chart at the time of measurement in the first embodiment.

FIG. 4 is a diagram showing a change over time in a battery terminal voltage when charging / discharging is performed according to the timing chart in the first embodiment.

FIG. 5 is a diagram showing a charge / discharge IV characteristic curve of a battery for explaining a charge / discharge current of the battery in the first embodiment.

FIG. 6 is a measured 3HR capacity% in the first embodiment.
FIG. 3 is a diagram showing a correlation between a voltage after 5 seconds and discharge.

FIG. 7: Measured 3HR capacity% in the first embodiment
It is a diagram which shows the correlation of the voltage after 5 seconds of charging.

FIG. 8 is an actually measured 3HR capacity% in the first embodiment.
It is a diagram which shows the correlation of the 5th charging voltage increase.

FIG. 9 is a diagram showing a measurement error between the capacity% measured by the life determining apparatus of the first embodiment and the capacity% measured by a commercial charge / discharge machine.

FIG. 10 is a diagram showing voltage changes during charge and discharge in a conventional storage battery capacity and life determining method.

[Explanation of symbols]

 1 Power Supply Section 2 Charging Section 3 Discharging Section 4 Voltage Measuring Section 5 Control Section 6 Lead Acid Battery

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Koichiro Hara, 2-1-1 Asahi-cho, Kariya city, Aichi prefecture, Aisin Seiki Co., Ltd. (72) Takeshi Masui 2-1-1, Asahi-cho, Kariya city, Aichi prefecture Aisin Seiki Co., Ltd. Co., Ltd. (72) Inventor Tetsuki Kamio 2-1-1 Asahi-cho, Kariya city, Aichi Aisin Seiki Co., Ltd. (72) Inventor Yasuhiro Otsuka 1-cho, Toyota city, Aichi Toyota Motor Co., Ltd. (72 ) Inventor Keiji Ogaki 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Automobile Co., Ltd.

Claims (8)

[Claims] 1. An open circuit voltage of a lead storage battery before charging is measured, the lead storage battery is charged for a certain period of time, a charge end voltage at the end of charging is measured, and a pause is made for a certain period after the end of charging, and a rest time is set. After discharging for a certain period of time, the discharge end voltage at the end of discharge is measured, and the life of the lead storage battery is determined based on the measured open circuit voltage, charge end voltage, and discharge end voltage. Judgment method. 2. The lead storage battery according to claim 1, wherein the capacity of the lead storage battery calculated based on the measured open circuit voltage, charge end voltage, and discharge end voltage has a capacity in the range of 60 to 110% with respect to the initial capacity. A method for determining the life of a lead storage battery, which is characterized by determining the degree of life depending on whether or not it is used. 3. The method for determining the life of a lead storage battery according to claim 1, wherein the lead storage battery is fully charged before starting charging and the open circuit voltage of the fully charged lead storage battery is measured. 4. The lead acid battery according to claim 2, wherein the capacity of the lead acid battery is calculated according to a multiple regression equation in which the coefficient is multiplied by the measured open circuit voltage, charge end voltage, and discharge end voltage. Life judgment method. 5. The lead-acid battery life determining method according to claim 4, wherein the measured open circuit voltage, charge end voltage, and discharge end voltage are multiplied by an experimentally determined constant as the coefficient. 6. A power supply unit that is connected to a commercial power supply and outputs a required power supply voltage, a charging unit that is connected to and charges a lead storage battery terminal, and a discharging unit that is connected to a lead storage battery terminal and discharges. The voltage measuring unit that measures the terminal voltage of the lead storage battery, the open circuit voltage of the lead storage battery before starting charging, the charge end voltage at the end of charging, and the discharge end voltage at the end of discharging And a control unit for determining the life of the lead storage battery by calculating. 7. The calculating unit according to claim 6, wherein the control unit stores a charging time of the charging unit, a discharging time of the discharging unit, a pause time after charging after discharging, and a measurement procedure. A lead-acid battery life determining device characterized by being provided. 8. The control section according to claim 7, wherein the measured open circuit voltage, charge end voltage,
And a constant obtained experimentally as a coefficient to be multiplied with the discharge end voltage, the measured open circuit voltage for calculating the capacity of the lead storage battery, the charge end voltage, and the discharge end voltage are multiplied by the constant and added. A lead-acid battery life determining device, comprising: a computing unit that stores a regression equation.