JPH10144358A - Battery current capacity measuring instrument and battery current capacity measuring method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To precisely measure current capacity of numerous batteries irrespective of rise or fall of an ambient temperature by obtaining characteristic curve based on measured values of battery temperature and a current capacity using an obtained correction curve based on a current capacity every ambient temperature that is different between typical battery charge and discharge periods. SOLUTION: Measured values such as current, temperature, or the like during battery charge and discharge periods and a program are inputted from measuring circuits 24 and 28 and an external memory 38 to an input port 34 of a computer. Based on these inputs, a current capacity at each different ambient temperature is found by current capacity measuring means 92, and based thereon a correction curve is obtained by correction curve producing means 94. Next, with regard to numerous batteries, current capacity is found similarly, and based on this current capacity and temperature measurement data of a predetermined timing due to temperature detecting means 96, a battery characteristic curve is obtained by characteristic curve producing means 98 using the correction curve. Based on the characteristic curve, a nominal current capacity of a measured battery is found by nominal capacity calculating means 100.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a current capacity measuring device and a current capacity measuring method for a rechargeable secondary battery such as a Ni-Cd battery or a lithium battery.

[0002]

2. Description of the Related Art For example, a cylindrical secondary battery such as a Ni-Cd battery or a lithium battery has a positive electrode plate provided with current collecting leads, a negative electrode plate, and an electrode wound through a separator. It is configured by inserting a plate group into a cylindrical case.

In general, when a battery is used as a DC power supply for an electronic device, a plurality of batteries are connected in series or in parallel. For this reason, if at least one of the plurality of connected batteries has a low current capacity, the performance and the life as a DC power supply are limited by the low current capacity battery. That is, the current capacity at the time of discharging is an important parameter in determining the performance of the battery.

[0004] The measurement of the current capacity at the time of discharging the battery is performed by:
At the stage before the start of discharging, for example, constant current charging and constant voltage charging are performed to keep the voltage across the battery at a constant voltage, and at the same time as the discharge starts, a discharging circuit is connected to the battery to supply a constant current from the battery. The discharge measurement is terminated when the voltage between both ends of the battery becomes lower than the specified level.

[0005] The current capacity of the battery at the time of discharge is obtained by calculating the accumulation of the current value from the discharge start point to the discharge end point.
By setting the temperature to (± 2 ° C.), the nominal current capacity of the battery can be obtained.

[0006]

Incidentally, in these secondary batteries, the battery itself generally generates heat during charging and discharging of the battery, and the heat changes the current capacity of the battery. Therefore, during charging / discharging, in order to keep the ambient temperature constant, a method of forcibly blowing air cooling or the like is used to suppress the temperature rise of the battery as much as possible.

[0007] When charging or discharging one or several batteries, the above-mentioned equipment is considered to be effective.
When charging / discharging a large number (for example, 256) of cells at a time, it is necessary to increase the space (space for measurement). May not be possible. For this reason, a problem arises in that the current capacity cannot be accurately measured for all batteries.

The present invention has been made in view of such a problem, and has a battery current capacity measuring device capable of accurately measuring the current capacity of a large number of batteries regardless of an increase or decrease in ambient temperature. And a method for measuring the current capacity of a battery.

[0009]

According to a first aspect of the present invention, there is provided a battery current capacity measuring apparatus according to the present invention, wherein at least at least a current capacity of a regular battery at the time of discharging is measured by appropriately setting an ambient temperature. Correction curve holding means for holding the current capacity characteristic curve with respect to the change as a correction curve, temperature detection means for detecting the temperature of the battery to be measured, and current capacity measurement means for measuring at least the current capacity of the battery to be measured at the time of discharging, A characteristic curve creation unit that creates a characteristic curve of the battery under test along the correction curve based on the temperature detected by the temperature detection unit and the current capacity obtained by the current capacity measurement unit; Current capacity calculating means for obtaining a nominal current capacity of the battery to be measured based on the curve is provided.

As a result, first, at least the current capacity of a regular battery at the time of discharging is measured. This measurement is performed with the ambient temperature set appropriately. The current capacity value obtained by one current capacity measurement is plotted corresponding to the set temperature. By setting a plurality of ambient temperatures and performing current capacity measurement, a current capacity characteristic curve with respect to temperature change is obtained. Will be required. This current capacity characteristic curve is held as a correction curve through the correction curve holding means.

After that, an actual current capacity measurement for the battery to be measured is performed. In this measurement,
The temperature is detected by the temperature detecting means, and the current capacity of the measured battery at least at the time of discharging is measured by the current capacity measuring means.

Thereafter, based on the detected temperature and the measured current capacity, a characteristic curve of the battery under test is created along the correction curve through the characteristic curve creating means. Then, the current capacity calculating means obtains a nominal current capacity (nominal current capacity value) of the measured battery based on the characteristic curve.

In the current capacity measurement by the current capacity measuring means, when the battery to be measured itself generates heat, the current capacity value of the battery to be measured generally increases, and takes a value far from the actual nominal current capacity. . That is, when the battery to be measured itself generates heat, the nominal current capacity cannot be obtained with high accuracy.

However, in the present invention, the current capacity value (hereinafter referred to as a correction value for convenience) in a normal battery at the temperature rise due to the heat generation and the temperature at a specified temperature for obtaining the nominal current capacity are obtained. Since both the current capacity value (hereinafter referred to as a reference value for convenience) can be determined from the correction curve, the correction value derived from the correction curve is compared with the current capacity value of the battery under test, and the change is calculated. By adding the minute to the reference value, the nominal current capacity of the battery under test can be easily and accurately obtained.

On the other hand, when measuring the current capacity of each of a large number of batteries to be measured, the ambient temperature distribution cannot be made uniform because the space for measurement is large, and therefore the current capacity between the batteries is low. The values vary, making it impossible to accurately measure the current capacity value of all the batteries to be measured.

However, in the present invention, since the current capacity value of each battery to be measured can be corrected based on a correction curve serving as a reference, even if the temperature distribution in the measurement space is not uniform, a large number of All nominal current capacities in the battery under test can be accurately determined.

That is, in the battery current capacity measuring device according to the present invention, regardless of the rise or fall of the ambient temperature,
The current capacities of a large number of batteries can be accurately measured.

The temperature measurement by the temperature detecting means may measure at least the surface temperature of the battery to be measured at the start of discharging. In this case, for example, when the charge measurement is being performed in the previous stage, the heat generated in the battery to be measured in the charge measurement can be accurately detected by the temperature detecting means in a timely manner. Since the temperature is measured, the heat generation temperature can be detected more accurately.

In the above configuration, the current capacity measuring means includes a multiplying means for multiplying a current value of the battery to be measured measured at a predetermined sampling time by a predetermined sampling time to obtain a unit current capacity; An accumulating means for accumulating the unit current capacity calculated every time until the end of the measurement to obtain a current capacity may be provided (the invention according to claim 3).

Thus, the current capacity measuring means first multiplies the current value of the battery under test measured at every predetermined sampling time by the predetermined sampling time through the multiplying means, and obtains the unit current at the predetermined sampling time. Capacity is required. The calculated unit current capacity is added to the cumulative value of the unit current capacity up to the previous time by the accumulating means to be the current cumulative value.

Then, by repeating the above series of operations over the measurement period, the current capacity value of the battery under test is obtained.

Further, in the above configuration, the characteristic curve creating means includes a correction curve processing means for obtaining a correction value corresponding to the temperature and a reference value corresponding to a specified temperature based on the correction curve; Correction value processing means for obtaining a change from the correction value may be provided, and the current capacity calculating means may obtain the nominal current capacity by correcting the change to the reference value. 4).

According to this, the characteristic curve creating means firstly sets the correction value corresponding to the temperature and the reference value corresponding to the specified temperature based on the correction curve held by the correction curve holding means. Required through processing means.
Thereafter, a change between the current capacity value and the correction value is calculated through a correction value processing unit, and then, the change in the nominal current capacity is corrected by correcting the change to the reference value through the current capacity calculation unit. Is calculated.

In this case, based on the temperature detected by the temperature detecting means and the current capacity measured by the current capacity measuring means,
When obtaining the nominal current capacity based on the correction curve,
This can be performed with simple processing, and the circuit configuration can be simplified and the program capacity can be reduced.

Next, a method for measuring the current capacity of a battery according to the present invention according to the present invention is a method for measuring the current capacity of at least a regular battery at the time of discharging, with respect to a temperature change obtained by appropriately setting the ambient temperature. The capacity characteristic curve is a correction curve, and based on the temperature of the battery under test and the current capacity of the battery under test at least at the time of discharging, a characteristic curve of the battery under test is created along the correction curve. A nominal current capacity of the measured battery is obtained based on the measured current capacity.

In this case, the current capacity value (correction value) of a regular battery at a temperature rise due to heat generation of the battery itself to be measured.
And the current capacity value (reference value) at a prescribed temperature for obtaining the nominal current capacity can be determined from the correction curve, so that the correction value derived from the correction curve and the current capacity of the battery under test are obtained. By comparing the values and adding the change to the reference value, the nominal current capacity of the battery under test can be easily and accurately obtained.

Further, in the present invention, since the current capacity value of each battery to be measured can be corrected based on a correction curve serving as a reference, even if the temperature distribution in the measurement space is non-uniform, a large number of All nominal current capacities in the battery under test can be accurately determined. That is, it is possible to accurately measure the current capacities of many batteries regardless of the rise or fall of the ambient temperature.

Next, a method for measuring the current capacity of a battery according to the present invention according to the present invention is a method for measuring the current capacity of a regular battery at least at the time of discharging, with respect to a temperature change obtained by appropriately setting an ambient temperature. A correction curve holding step of holding a capacity characteristic curve as a correction curve, a temperature detection step of detecting a temperature of the battery to be measured, a current capacity measurement step of measuring at least a current capacity of the battery to be measured at the time of discharging, and the temperature detection A characteristic curve creating step of creating a characteristic curve of the battery under test along the correction curve based on the temperature obtained in the step and the current capacity obtained in the current capacity measuring step; and A current capacity calculating step of obtaining a nominal current capacity of the battery to be measured.

As a result, first, at least the current capacity of a regular battery at the time of discharging is measured. At this time,
The operation is performed with the ambient temperature appropriately set. The current capacity value obtained by one current capacity measurement is plotted corresponding to the set temperature. By setting a plurality of ambient temperatures and performing current capacity measurement, a current capacity characteristic curve with respect to temperature change is obtained. Will be required. This current capacity characteristic curve is
The correction curve is held as a correction curve by the processing in the correction curve holding step.

Thereafter, the actual current capacity of the battery under test is measured. In this measurement,
The temperature is detected by the process of the temperature detecting step, and the current capacity of the measured battery at least at the time of discharging is measured in the process of the current capacity measuring step.

Thereafter, based on the detected temperature and the measured current capacity, a process in a characteristic curve creating step is performed.
A characteristic curve of the measured battery is created along the correction curve. Then, by the processing in the current capacity calculation step, the nominal current capacity of the measured battery is obtained based on the characteristic curve.

In the current capacity measuring process in the current capacity measuring step, when the battery to be measured itself generates heat, the current capacity value of the battery to be measured generally increases, and takes a value far from the actual nominal current capacity. become. That is, when the battery to be measured itself generates heat, the nominal current capacity cannot be obtained with high accuracy.

However, in the present invention, the current capacity value (correction value) of the normal battery at the temperature rise due to the heat generation and the current capacity value (reference value) at the specified temperature for obtaining the nominal current capacity. Can be determined from the correction curve, the correction value derived from the correction curve and the current capacity value of the battery to be measured are compared, and the amount of change is added to the reference value, whereby the measured value is measured. The nominal current capacity of the battery can be obtained easily and accurately.

On the other hand, when the current capacity value is measured for each of a large number of batteries to be measured, the ambient temperature distribution cannot be made uniform because the space for the measurement is large, so that the current capacity value between the batteries is low. The values vary, making it impossible to accurately measure the current capacity value of all the batteries to be measured.

However, in the present invention, since the current capacity value of each battery to be measured can be corrected based on the reference correction curve, even if the temperature distribution in the measurement space is non-uniform, a large number of All nominal current capacities in the battery under test can be accurately determined.

That is, in the method for measuring the current capacity of a battery according to the present invention, regardless of the rise or fall of the ambient temperature,
The current capacities of a large number of batteries can be accurately measured.

In the temperature detecting step, the surface temperature of the battery to be measured at least at the start of discharging may be measured (the invention according to claim 7). in this case,
In the case where the charge measurement is performed in the previous stage, the heat generated in the battery to be measured in the charge measurement can be accurately detected in timing in the temperature detection step, and the surface temperature is measured. So that
The exothermic temperature can be detected more accurately.

Further, in the above method, the current capacity measuring step includes a multiplying step of multiplying a current value of the battery to be measured measured every predetermined sampling time by a predetermined sampling time to obtain a unit current capacity; An accumulation step for accumulating the unit current capacity calculated every time until the end of the measurement to obtain a current capacity may be included (the invention according to claim 8).

Thus, in the current capacity measuring step, first, through the processing in the multiplying step, the current value of the battery to be measured, which is measured at every predetermined sampling time, is multiplied by the predetermined sampling time. Is required. The calculated unit current capacity is added to the accumulated value of the unit current capacity up to the previous time by the processing in the accumulation step, and is set as the current accumulated value.

Then, by repeating the series of processing operations over the measurement period, the current capacity value of the measured battery is obtained.

In the above method, the characteristic curve creating step may include: a correction curve processing step of obtaining a correction value corresponding to the temperature and a reference value corresponding to a specified temperature based on the correction curve; In the current capacity calculating step, the nominal current capacity may be obtained by correcting the change to the reference value, including a correction value processing step of obtaining a change from the correction value. 9).

Thus, the processing in the characteristic curve creating step first includes, based on the correction curve held in the correction curve holding step, a correction value corresponding to the temperature and a reference value corresponding to the specified temperature. Is obtained through the processing in the correction curve processing step. Thereafter, a change in the current capacity value and the correction value is calculated through the processing in the correction value processing step, and then the change is corrected to the reference value through the processing in the current capacity calculation step. The nominal current capacity will be calculated.

In this case, when a nominal current capacity is obtained based on a correction curve based on the temperature detected in the temperature detection step and the current capacity measured in the current capacity measurement step, This can be performed with simple processing, and the circuit configuration can be simplified and the program capacity can be reduced.

[0044]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A battery current capacity measuring apparatus and a battery current capacity measuring method according to the present invention will be described below with reference to, for example,
Embodiment applied to current capacity measurement for a cylindrical secondary battery (hereinafter simply referred to as a battery) such as a Cd battery or a lithium battery (hereinafter simply referred to as a current capacity measurement device according to the embodiment) Will be described with reference to FIGS.

The current capacity measuring device 10 according to the present embodiment
Performs constant-current charging, constant-voltage charging, and constant-current discharging on the battery 12, captures a change in current, a change in voltage, and a change in temperature during a charge / discharge period in units of sampling time, and stores them as data strings in an external storage device. The current capacity value during the charging period and the current capacity value during the discharging period are calculated and transferred to the external storage device.

More specifically, the current capacity measuring device 10
As shown in FIG. 1, a computer 14 in which hardware and software are incorporated so as to control various circuits and enable input and data processing of multi-channel detection measurement data, A constant voltage circuit 16 that generates a constant voltage necessary for constant voltage charging of the power supply voltage Vc and supplies it to a subsequent circuit system under control, and generates a constant current required for constant current charging under the control of the computer 14 and Constant current circuit 18 for supplying to the circuit system
A constant current / voltage switching circuit 22 for selectively connecting any one of the constant voltage circuit 16, the constant current circuit 18 and a discharging circuit 20 to be described later to a circuit system based on switching control of the computer 14; The discharge circuit 20 is sometimes activated (power supply or the like) and keeps the current flowing from the battery constant. The current flowing to the battery 12 and the current flowing from the battery 12 are measured to obtain digital data (current measurement data). ) To supply current to the computer 14
4, a voltage measuring circuit 26 for measuring the voltage between both ends of the battery 12 and supplying the digital data (voltage measurement data) to the computer 14, and measuring the temperature of the battery 12 and transmitting the digital data (temperature measurement data) to the computer 14. It has a temperature measuring circuit 28 for supplying the temperature measuring circuit 14.

The computer 14, as shown in FIG.
Operation RAM used for operation of various programs
30 and a data RAM for storing data from an external device, data processed by various programs, etc.
32, an input / output port 34 for inputting / outputting data to / from an external device, and a CPU (control device and logical operation device) 36 for controlling these various circuits.

The various circuits exchange data between the circuits via a data bus DB derived from the CPU 36, and further control an address bus and a control bus (neither shown) derived from the CPU 36. Through each C
It is configured to be controlled by the PU 36.

The input / output port 34 includes an operating system (OS), a system program, an application program (current capacity processing means) for performing charge / discharge measurement (including monitoring), and an external storage device storing various data. (Comprising a hard disk, flexible disk, magneto-optical disk, CD-R, etc.) 38;
A keyboard as the key input device 40 and a coordinate input device 4
2, a pointing device including a mouse, a light pen, a dial, etc., which is a central device for dialogue between the current capacity measuring device 10 and an operator, and is used in conjunction with the key input device 40 and the coordinate input device 42. A monitor as a display device 44 is connected.

The current measuring circuit 24 and the voltage measuring circuit 26
A / D converters 50, 52 and 54 are connected to the final stage, respectively, of the temperature measurement circuit 28, and the analog measurement current waveform, the measurement voltage waveform, and the measurement temperature waveform (electric signal waveform corresponding to the temperature) are respectively digitalized. The data is converted and output as current measurement data, voltage measurement data, and temperature measurement data. A / D converters 50, 52 and 5
The sampling time at 4 is set to, for example, 1 second or 2 seconds, and the sampling pulse Ps for each of the A / D converters 50, 52, and 54 is wired so as to be supplied from the timing generator 56. .

The current capacity measuring device 10 has, for example, 25
The multi-channel connection is configured so that the six batteries 12 can be simultaneously charged with constant current, constant voltage, and constant current, respectively.

Specifically, first, the constant current / voltage switching circuit 2
2. 256 current measurement circuits 24, voltage measurement circuits 26, and temperature measurement circuits 28 are provided, each corresponding to the number of batteries 12, and these 256 constant current / voltage switching circuit groups,
(256 × 3) wirings respectively derived from the 56 current measurement circuit groups, the 256 voltage measurement circuit groups, and the 256 temperature measurement circuit groups are connected to the computer 14.

A detection jig 60 shown in FIG. 3 is used so that measurement can be simultaneously performed on the 256 batteries 12.

The detection jig 60 includes a container 62 capable of accommodating, for example, 256 batteries 12 arranged in a matrix, a fixing table 64 for fixing the container 62, and a container 62 above the container 62. An upper contact mounting plate 68 on which a plurality of upper contacts 66 are mounted corresponding to each battery 12; an upper contact arm 70 for moving the upper contact mounting plate 68 up and down; The lower contact mounting plate 7 which is disposed below the container 62 and has a plurality of lower contacts 72 corresponding to each battery 12.
4 and a lower contact arm 76 for moving the lower contact mounting plate 74 up and down.

The fixing table 64 is formed of a frame, and can fix the container 62 by supporting the peripheral portion of the container 62 upward. Further, the frame opening 64a of the fixing base 64 has an opening width that allows the lower contactor mounting plate 74 to be inserted. Therefore, the lower contact mounting plate 74 is fixed to the fixing base 64 by the lower contact arm 76.
The lower contact 72 attached to the lower contact mounting plate 74 is brought into contact with, for example, the negative electrode of the corresponding battery 12 by allowing the lower contact 72 to enter the lower side of the container 62 through the frame opening 64a.

This is the same for the upper contact mounting plate 68, and the upper contact mounting plate 68 is connected to the upper contact arm 70.
As a result, the upper contacts 66 attached to the upper contact mounting plate 68 come into contact with, for example, the positive electrode of the corresponding battery 12.

An upper contact cable 78 is led out from each of the upper contacts 66 and connected to the corresponding current measuring circuit 24 and voltage measuring circuit 26, respectively. The lower contactor cables 80 are also respectively derived from a large number of lower contactors 72, and are respectively connected to the corresponding negative voltage power supply -Vc or ground (potential Vs
s).

A large number of surface contacts 82 for detecting the temperature of the battery 12 are attached to the upper contact mounting plate 68 in addition to the large number of upper contacts 66.
The two tips are positioned so as to contact the corresponding surfaces of the battery 12 respectively. These many surface contacts 8
2, a surface contact cable (not shown) is led out and connected to a corresponding temperature measurement circuit 28. The surface contact 82 can be constituted by, for example, a thermistor or a thermocouple.

When charge / discharge measurement is performed on the 256 batteries 12, the 256 batteries 12 are accommodated in the container 62 with, for example, the positive electrode facing upward, and the container 62 is transported using a transport arm or the like. It is placed on the frame of the fixed base 64. Thereafter, the upper contact mounting plate 68 is moved downward by the upper contact arm 70 so that a number of the upper contacts 66 are brought into contact with the corresponding positive electrodes of the battery 12, and further, the lower contact arm 76 is used to lower the upper contact 66. The contact mounting plate 74 is moved upward to bring the plurality of lower contacts 72 into contact with the corresponding negative electrodes of the battery 12.

In this state, the computer 14 selectively controls the switching of the 256 constant current / voltage switching circuits 22 to perform constant current charging, constant voltage charging, and constant current discharging on the 256 batteries 12. Will be
The current measurement data, the voltage measurement data, and the temperature measurement data for the 256 batteries 12 are supplied to the computer 14, and the data is transferred to the external storage device 38 using the data RAM 32 as a transfer buffer under the program control of the CPU 36 in the computer 14. Is done.

This data transfer is performed by storing the storage start logical address of each channel for current measurement, voltage measurement, and temperature measurement declared in advance in programming in a transfer header.

As a result, the external storage device 38 stores a measurement data sequence for each channel for current measurement, a measurement data sequence for each channel for voltage measurement, and a measurement data sequence for each channel for temperature measurement. Will be.

In particular, in the current capacity measuring apparatus 10, as shown in FIG. 4, the current capacity processing means 90 for obtaining the nominal current capacity of the 256 batteries to be measured is, for example, software (current capacity processing program). The current capacity processing means 90 includes a current capacity measurement means 92 for obtaining a current capacity value in a charging period and a discharging period of each battery under measurement based on current measurement data supplied for each channel, Correction curve creating means 94 for creating a correction curve based on current capacity values at different ambient temperatures obtained by current capacity measurement during charge / discharge periods for one typical battery; and temperature supplied to each channel Temperature detection means 96 for taking in temperature measurement data for each channel at a required timing from the measurement data; The characteristic curve of the measured battery along the correction curve for each channel based on the temperature measurement data for each channel taken in and the current capacity value for each channel obtained by the current capacity measuring means 92. And a nominal capacity calculating means 100 for obtaining a nominal current capacity of each battery under test based on the created characteristic curve for each channel.

Therefore, in the current capacity measuring apparatus 10, an initial operation, for example, a system check, a memory check and a setup in the current capacity measuring apparatus 10 are performed simultaneously with turning on the power. Current capacity processing means (current capacity processing program)
The program 90 is read and stored in the operation RAM 30. At the same time, data generated during the operation of the program 90 is temporarily stored, and parameters are exchanged between routines constituting the program 90. A work area used for the operation is allocated in the operation RAM 30.

Various storage areas and data files created by the current capacity processing program 90 are assigned to the data RAM 32.

The current capacity processing program 90 stored in the operation RAM 30 stores data RA in various areas.
It is activated at the same time when the assignment to M32 is completed.
The processing operation of the current capacity processing program 90 will be described later.

Current capacity measuring apparatus 10 according to the present embodiment
In the above, a large number of batteries to be measured (hereinafter simply referred to as work 12
Before performing the charge / discharge measurement on the representative battery 12 (hereinafter simply referred to as a regular battery 12), the charge period and discharge of the regular battery 12 are measured. Each current capacity in the period is obtained and registered in the external storage device 38.

In particular, in measuring the current capacity of the regular battery 12, the ambient temperature is appropriately set and changed. Specifically, for example, the ambient temperature is set to 20
C., 25.degree. C., 30.degree. C., 35.degree. C., 40.degree. C., and 45.degree. C. are set, and charge / discharge measurement is performed at each of the ambient temperatures.

Here, a case where charge / discharge measurement is performed on a regular battery 12 using the current capacity measuring device 10 according to the present embodiment will be described with reference to the block diagram of FIG. 1 and the characteristic diagram of FIG. .

First, the various ambient temperatures described above (20 ° C., 2
5 ° C., 30 ° C., 35 ° C., 40 ° C., and 45 ° C.). In the first charge / discharge measurement for the regular battery 12, for example, 20 ° C. is selected. next,
For example, a constant temperature bath or the like is used so that the surface temperature of the regular battery 12 becomes the selected ambient temperature. At this stage,
One ambient temperature (eg, 20
℃) setting is completed. In this case, since the ambient temperature is set for one battery 12, the surface temperature of the battery 12 is usually the same as the ambient temperature.

Then, based on an input to the computer 14 of an interrupt signal generated by operating a start button (not shown), the computer 14 outputs to the constant current / voltage switching circuit 22 a switching signal indicating selection of a constant current. . The constant current / voltage switching circuit 22 is connected to the constant current circuit 18 in the preceding stage based on the input of the switching signal from the computer 14.
And the subsequent output line. As a result, a constant current is supplied to the battery 12 to perform constant current charging. This constant current charging causes the voltage across the regular battery 12 to rise exponentially. The current waveform supplied to the battery 12 at this time is sequentially supplied to the computer 14 as current measurement data for each predetermined sampling time via the current measurement circuit 24, and the voltage waveform across the battery 12 is supplied for each predetermined sampling time via the voltage measurement circuit 26. The data is sequentially supplied to the computer 14 as voltage measurement data.

After a lapse of a predetermined time T1 from the start time t0 of the constant current charging, a switching signal indicating selection of a constant voltage is output from the computer 14 to the constant current voltage switching circuit 22. The constant current voltage switching circuit 22 connects the constant voltage circuit 16 of the preceding stage to the output line of the subsequent stage based on the input of the switching signal from the computer 14. As a result, a constant voltage is applied to both ends of the battery 12, and constant voltage charging is performed. Due to this constant voltage charging, the current flowing through the regular battery 12 decreases exponentially. In this constant voltage charging, similarly to the above constant current charging, the current waveform flowing through the battery 12 is converted into current measurement data for each predetermined sampling time by the computer 14 through the current measurement circuit 24.
, And the voltage waveform across the battery 12 is sequentially supplied to the computer 14 through the voltage measurement circuit 26 as voltage measurement data for each predetermined sampling time.

After a lapse of a predetermined time T2 from the start time t1 of the constant voltage charging, the computer 14 outputs a switching signal indicating selection of the discharging circuit 20 to the constant current voltage switching circuit 22. The constant current / voltage switching circuit 22 connects the discharge circuit 20 in the preceding stage and the output line in the subsequent stage based on the input of the switching signal from the computer 14. As a result, a current flows from the battery 12 to the discharge circuit 20 side, and discharge is started. In this discharging, the discharging circuit 20 controls the current flowing from the battery 12 to be constant. That is, constant current discharge is performed.

In this constant-current discharge, the current flowing from the battery 12 into the discharge circuit 20 is constant, so that the voltage across the battery 12 decreases exponentially. The current waveform flowing from the battery 12 to the discharge circuit 20 is sequentially supplied to the computer 14 as current measurement data at every predetermined sampling time through the current measurement circuit 24, and the voltage waveform at both ends of the battery 12 is measured at each predetermined sampling time through the voltage measurement circuit 26. The data is sequentially supplied to the computer 14 as data.

When the value of the voltage measurement data supplied to the computer 14 falls below the lower limit value Vmin, the computer 14 outputs a stop signal to the constant current / voltage switching circuit 22. The constant current / voltage switching circuit 22 cuts off the connection between the circuit at the preceding stage and the output line based on the input of the stop signal from the computer 14, and brings the battery 12 into an electrically floating state. At this point, the regular battery 12 under the set one ambient temperature, for example, under 20 ° C.
The charge / discharge measurement for is completed.

After the charge / discharge measurement of the regular battery 12 at 20 ° C. is completed, the temperature of the constant temperature bath is increased to set the ambient temperature to, for example, 25 ° C., and the above-described series of charge / discharge measurement is performed again. Will be That is, the charge / discharge measurement is repeatedly performed at each set temperature.

In the charging / discharging measurement for the regular battery 12, the current capacity value and the discharge capacity of the charging period T3 at each set temperature are measured through the current capacity measuring means 92 and the correction curve creating means 94 in the current capacity processing means 90. The current capacity value in the period T4 is calculated.

As shown in FIG. 6, the current capacity measuring means 92 calculates the value of the current measurement data (current measurement value) supplied every predetermined sampling time and the predetermined sampling time τs
Multiplying means 102 for obtaining a unit current capacity by multiplying
A charge accumulating means for accumulating the unit current capacity calculated every predetermined sampling time from a charge start time t0 to a charge end time t2 to obtain a current capacity value in a charge period T3.
And a discharge accumulating means 106 for accumulating the unit current capacity calculated every predetermined sampling time from the discharge start time t2 to the discharge end time t3 to obtain a current capacity value in the discharge period T4.

Here, the processing operation of the current capacity processing means 90 in the charging / discharging measurement for the regular battery 12, particularly the processing operation of the current capacity measuring means 92 and the correction curve creating means 94 will be described with reference to the flowcharts of FIGS. This will be described with reference to FIG.

First, in step S1, an initial value "0" is stored in a register i used as an index register of a set temperature, and the register i is initialized.

Next, in step S2, it is determined whether the setting of the ambient temperature has been completed. This determination is
For example, the determination is made based on whether an interrupt signal generated by operating the start button has been input, and the step S2 is repeated until the interrupt signal is input. That is,
Waits for completion of temperature setting.

If the interrupt signal has been input, the flow advances to step S3 to store an initial value "0" in a register RA used as a register for accumulating a current capacity (hereinafter simply referred to as a charging capacity) during a charging period T3. And store it in the register RA
Is initialized.

Next, in step S4, it is determined through the current capacity measuring means 92 whether or not an interruption of the input of the current measurement data from the current measurement circuit 24 has been made, and the step S4 is repeated until there is an input interruption. That is, it waits for data input.

If there is an interruption of the input of the current measurement data, the process proceeds to the next step S5, and the inputted current measurement data is stored in the register R1 through the current capacity measuring means 92.
After that, in the next step S6, the multiplication means 1
02, a unit current capacity value is calculated. This calculation is based on the value of the current measurement data (current measurement value) stored in the register R1 and the predetermined sampling time τs (for example, 2
S), and the unit current capacity value obtained by the multiplication is stored in the register R1.

Next, in step S7, the accumulating process of the unit current capacity is performed through the accumulating means 104 for charging. This process is performed by adding the value (unit current capacity value) of the register R1 to the value (accumulated value) of the register RA and storing the added value in the register RA again. next,
In step S8, it is determined whether or not charging has been completed. This determination is made based on whether or not a switching signal for selecting the discharging circuit 20 output from the computer 14 to the constant current / voltage switching circuit 22 has been generated at the time point t2 when the charging measurement ends. If it is determined that the switching signal has not been generated, the process returns to step S4 and returns to step S4.
The subsequent processing is repeated. That is, at the next sampling time, the current measurement data supplied from the current measurement circuit 24 is received, and the unit current capacity and the accumulated value are obtained based on the current measurement data.

If it is determined in step S8 that the charging is completed, the process proceeds to the next step S9. At this point, the accumulated value stored in the register RA is the current capacity value in the charging period T3.

In step S 9, the current capacity measuring means 92 outputs the charge capacity table TB 1
The current capacity value in the register RA is stored in a record indicated by the value of the register i (hereinafter, simply referred to as an i-th record).

Next, in step S10 in FIG. 8, an initial value "0" is stored in a register RB used as a register for accumulating the current capacity (hereinafter simply referred to as discharge capacity) during the discharge period T4. Initialize the register RB.

Next, in step S11, it is determined through the current capacity measuring means 92 whether or not an interruption of the input of the current measurement data from the current measurement circuit 24 has been made, and the step S11 is repeated until there is an input interruption. That is, it waits for data input.

If there is an interruption of the input of the current measurement data, the process proceeds to the next step S12, where the current capacity measuring means 92
Through the register R.
After storing the value in 1, in the next step S13, the unit current capacity value is calculated through the multiplication means 102. This calculation is performed by multiplying the measured current value stored in the register R1 by a predetermined sampling time τs, and the unit current capacity value obtained by the multiplication is stored in the register R1.

Next, in step S14, a process of accumulating the unit current capacity is performed through the accumulating means 106 for discharging. This process is performed by adding the value (unit current capacity value) of the register R1 to the value (accumulated value) of the register RB, and storing the added value in the register RB again.

Next, in step S15, it is determined whether or not the discharge has been completed. This determination is made based on whether or not a stop signal is output from the computer 14 to the constant current / voltage switching circuit 22 at the time point t3 when the discharge measurement ends. If it is determined that the stop signal has not been generated, the process returns to step S11 and returns to step S11.
The subsequent processing is repeated. That is, at the next sampling time, the current measurement data supplied from the current measurement circuit 24 is received, and the unit current capacity and the accumulated value are obtained based on the current measurement data.

If it is determined in step S15 that the discharge is completed, the process proceeds to step S16. At this point, the accumulated value stored in the register RB is the current capacity value in the discharge period T4. In step S16, the current capacity value in the register RB is stored in the i-th record of the discharge capacity table TB2 through the current capacity measuring means 92.

Next, after the value of the register i is updated by +1 in step S17, it is determined in next step S18 whether the charge / discharge measurement at all set temperatures has been completed. This determination is made, for example, based on whether or not an interrupt signal generated by operating the end button has been input.

When there is no input of the interrupt signal,
Returning to step S2, the processing after step S2 is repeated. That is, the charge capacity and the discharge capacity at the next ambient temperature are obtained and stored in the respective records of the charge capacity table TB1 and the discharge capacity table TB2.

If it is determined in step S18 that the charge / discharge measurement at all set temperatures has been completed, the process proceeds to the next step S19, in which the correction curve generating means 94 is used to execute the correction curve, particularly for the discharge capacity. Is created. Specifically, the current capacity values for each set temperature stored in the discharge capacity table TB2 are read, and based on these current capacity values, a correction curve shown in FIG. (See the solid line a) is created. In the example of FIG. 13, the correction curve is a straight line, but may be a curve depending on a product type or the like.

Next, in step S20, the current curve value for each unit temperature (for example, 1 ° C.) is obtained from the generated correction curve based on the correction curve generating means 94 to generate a series of current capacity data strings. I do.

Next, in step S21, the created current capacity data string is transferred as a correction value table TB3 to a predetermined address of the external storage device 38 through the correction curve creating means 94.

At this point, the processing by the current capacity measuring means 92 and the correction curve creating means 94 of the current capacity processing means 90 for the normal battery 12 is completed.

In the present embodiment, after the charge / discharge measurement of the regular battery 12 at each set temperature is completed, a large number (for example, 256)
Is measured.

In the charge / discharge measurement for the large number of works 12, the discharge period is measured through the current capacity measuring means 92, the temperature detecting means 96, the characteristic curve creating means 98 and the nominal capacity calculating means 100 in the current capacity processing means 90. The nominal current capacity of T4 is calculated.

As shown in FIG. 9, the characteristic curve creating means 98 is based on the correction curve created by the correction curve creating means 94, in particular, based on the correction value table TB3 stored in the external storage device 38. A correction curve processing unit 108 for obtaining a correction value corresponding to a temperature at a predetermined timing and a reference value corresponding to a specified temperature for each work; and a correction value corresponding to a measured current capacity value and a correction value corresponding to each work. Correction value processing means 11 for calculating the change from
0, and the nominal current capacity is obtained by correcting the change in the reference value for each work through the nominal capacity calculation means 100.

Next, the processing operation of the current capacity processing means 90 in the charging / discharging measurement for a large number of works 12, in particular, the current capacity measuring means 92, the temperature detecting means 96, the characteristic curve creating means 98 and the nominal capacity calculating means 100 The processing operation will be described with reference to the flowcharts of FIGS.

First, in step S101, it is determined through the current capacity measuring means 92 whether or not there has been an input interruption of the current measurement data from the current measurement circuit 24, and the step S101 is repeated until there is an input interruption. That is, it waits for data input.

When the current measurement data is input,
Proceeding to the next step S102, the current measurement data group of 256 workpieces 12 is received through the current capacity measurement means 92 and stored in the current measurement data storage area Z1 of the data RAM 32.

Next, in step S103, an initial value "0" is stored in a register i used as an index register of the work 12, and the register i is initialized.

Next, in step S104, the current measurement data storage area Z1
, The current measurement data for the i-th work is read out and stored in the register R1.

Next, in step S105, the unit current capacity value is calculated through the multiplication means 102. This calculation is performed by multiplying the value of the current measurement data (current measurement value) stored in the register R1 by a predetermined sampling time τs, and the unit current capacity value obtained by the multiplication is stored in the register R1. You.

Next, in step S106, the accumulating process of the unit current capacity is performed through the accumulating means 104 for charging. In this process, the accumulated value stored in the i-th record of the work charging capacity table TB4 is read, the value of the register R1 (unit current capacity value) is added to the accumulated value, and the added value is again used as the work charging capacity. I of table TB4
This is done by storing it in the record.

Next, in step S107, the value of the register i is updated by +1. In the next step S108, it is determined whether or not the accumulation processing of the unit current capacity values for all the works 12 at the sampling time is completed. Is determined. This determination is made based on whether or not the value of the register i is equal to or larger than the total number M of the works 12. When it is determined that the value of the register i is less than the total number M of the work 12,
Returning to step S104, the processing after step S104 is repeated. That is, the current measurement value for the next work 12 at the sampling time is read, and the unit current capacity and the accumulated value of the work 12 are obtained.

In step S108,
If it is determined that the accumulation processing of the unit current capacity values for all the works 12 at the sampling time has been completed, the process proceeds to the next step S109, and it is determined whether or not the charging measurement has been completed. This discrimination is performed by the computer 14 at the time point t2 when the charge measurement ends.
The determination is made based on whether or not a switching signal for selecting the discharge circuit 20 output to 2 has been generated. If it is determined that the switching signal has not been generated, the process returns to step S101, and the processes after step S101 are repeated. That is,
Current measurement circuit 2 for each channel at the next sampling time
4, the current measurement data group supplied from 4 is received, and based on these current measurement data, the unit current capacities and accumulated values of all the workpieces 12 at the next sampling time are obtained.

If it is determined in step S109 that the charging measurement has been completed, the process proceeds to step S1 in FIG.
Proceeding to 10, the initial value "0" is stored in the register t used as the temperature detection timing, and the register t is initialized.

Next, in step S111, it is determined through the current capacity measuring means 92 whether or not an interruption of the input of the current measurement data from the current measurement circuit 24 has been made, and the step S111 is repeated until there is an interruption of the input. That is, it waits for data input.

When the current measurement data is input,
Proceeding to the next step S112, the current measurement data group and the temperature measurement data group of 256 workpieces 12 are received through the current capacity measurement means 92, and the current measurement data storage area Z1 and the temperature measurement data storage area Z2 of the data RAM 32 are received. To be stored.

Next, in step S113, an initial value "0" is stored in a register i used as an index register of the work 12, and the register i is initialized.

Next, in step S114, it is determined through the temperature detecting means 96 whether or not it is time to detect the temperature. This determination is made based on whether the value of the register t is a predetermined value K (K = 0 in this example). In this example, since the predetermined value K = 0, the timing of temperature detection is immediately after the start of discharge.

If it is determined in step S114 that the current time is the temperature detection timing, the flow advances to the next step S115, where the temperature of the i-th work 12 from the temperature measurement data storage area Z2 is detected through the temperature detection means 96. Read the measurement data.

Next, in step S116, the read temperature value is stored in the i-th record of the temperature table TB6.

When the process in step S116 is completed or when the value of the register t is different from the predetermined value K, the process proceeds to the next step S117, in which it is determined whether or not the discharge measurement for the i-th work 12 is completed. Is performed. This determination is made based on whether or not a stop signal is output from the computer 14 to the i-th constant current / voltage switching circuit 22 at the end of the i-th discharge measurement. If it is determined that the i-th stop signal has not been generated, the process proceeds to the next step S118, where the current measurement data relating to the i-th work is read out from the current measurement data storage area Z1 through the current capacity measurement means 92 and the register is read. Store in R1.

Next, in step S119, the unit current capacity value is calculated through the multiplication means 102. This calculation is performed by multiplying the measured current value stored in the register R1 by a predetermined sampling time τs, and the unit current capacity value obtained by this multiplication is calculated by the register R1.
Is stored in

Next, in step S120, the accumulating process of the unit current capacity is performed through the accumulating means 106 for discharging. In this process, the accumulated value stored in the i-th record of the work discharge capacity table TB5 is read, the value of the register R1 (unit current capacity value) is added to the accumulated value, and the added value is again used as the work discharge capacity. I of table TB5
This is done by storing it in the record.

At the stage when the processing in step S120 is completed, or when it is determined in step S117 that the discharge measurement has been completed for the i-th workpiece, the process proceeds to the next step S121, and the process proceeds to step S121. After updating the value by +1 in the next step S122,
It is determined whether or not the accumulation processing of the unit current capacity values for all the works 12 at the sampling time has been completed. This determination is based on the fact that the value of the register i is
This is done depending on whether the above is true. When it is determined that the value of the register i is less than the total number M of the works 12, the process returns to the step S114, and the processes after the step S114 are repeated. That is, if the value of the register t is the predetermined value K, the temperature measurement data relating to the next work 12 is fetched into the temperature table TB6, and the current measurement value relating to the next work 12 at the sampling time is read and the current work value is read out. The unit current capacity and the accumulated value at 12 are obtained.

If it is determined in step S122 that the accumulation processing of the unit current capacity values for all the works 12 at the sampling time has been completed, the process proceeds to the next step S123, and the value of the register t is updated by +1. Thereafter, in the next step S124, it is determined whether or not the discharge measurement has been completed for all the workpieces 12.
This determination is made based on whether the value of the register t is equal to or greater than the maximum value, that is, the upper limit value T of the discharge measurement time. If it is determined in step S124 that the discharge measurement has not been completed for all the workpieces 12, the process returns to step S111, and the processes in and after step S111 are repeated. That is, at the next sampling time point, the current measurement data group and the temperature measurement data group supplied from the current measurement circuit 24 and the temperature measurement circuit 28 of each channel are received, and based on these current measurement data, The unit current capacity and the accumulated value of the work 12 are determined.

If it is determined in step S124 that the discharge measurement has been completed for all the workpieces 12, the process proceeds to step S125 in FIG. At this stage,
The current capacity values for all the works 12 are stored in the work discharge capacity table TB5, and the current capacity values for all the works 12 are stored in the temperature table TB6.
8 (correction curve processing means 108, correction value processing means 110)
Then, the process proceeds to the nominal capacity calculating means 100.

In step S125, an initial value "0" is stored in a register i used as an index register of the work 12, and the register i is initialized.

Next, in step S126, the temperature information on the i-th work 12 is read out through the correction curve processing means 108. Specifically, the temperature table TB
The temperature measurement value stored in the i-th record of No. 6 is read and stored in the register RA.

Next, in step S127, the current capacity value relating to the i-th work 12 is read out through the correction curve processing means 108. Specifically, the current capacity value stored in the i-th record of the work discharge capacity table TB5 is read and stored in the register RB.

Next, in step S128, the current capacity value (correction value) corresponding to the detected temperature indicated by the value of the register RA from the correction value table TB3 and the current capacity value (correction value) corresponding to the specified temperature are output from the correction value table TB3 through the correction curve processing means 108. Standard value)
And read the correction value and the reference value into the registers RC and R.
D. The specified temperature is 2 in this example.
Assume 5 ° C.

Next, in step S129, a change between the current capacity value for the i-th work 12 and the correction value is obtained through the correction value processing means 110. Specifically, a difference between the value (current capacity value) of the register RB and the value (correction value) of the register RC is obtained, and the difference value is stored in the register R5.

Next, in step S130, the nominal current capacity for the i-th work 12 is determined by the nominal capacity calculation means 100. Specifically, the register R
The nominal current capacity is obtained by adding the value (change) of the register R5 to the value of 4 (reference value).

That is, as shown in FIG. 13, the processing in steps S126 to S130 is performed using the correction curve a
(See the solid line) is translated along the vertical axis until the measurement result (the measured temperature value and the current capacity value) of the work 12 coincides, and a characteristic curve b (see the dashed line) for the work 12 is created and created. This is equivalent to obtaining the current capacity (nominal current capacity) at the specified temperature tb based on the obtained characteristic curve b.

In the example of FIG. 13, based on the measurement result of the work 12 (37 ° C., 1950 mAh), the characteristic curve b relating to the work 12 is created by performing parallel movement at the inclination of the correction curve a. A current capacity value (1850 mAh) at the above specified temperature (25 ° C.) is obtained, and the current capacity value is set as a nominal current capacity.

Next, in step S131, the calculated nominal current capacity is stored in the i-th record of the nominal capacity table TB7 through the nominal capacity calculation means 100. That is, the nominal current capacity of the i-th work 12 calculated in step S130 is registered in the corresponding record of the nominal capacity table TB7.

Next, after updating the value of the register i by +1 in step S132, the process proceeds to the next step S133, and it is determined whether or not the nominal current capacities of all the works 12 are registered in the nominal capacity table TB7. . This determination is made based on whether or not the value of the register i is equal to or larger than the total number M of the works 12. If the value of register i is work 12
If it is determined that the total number M is less than the total number M, the process returns to step S126, and the processes after step S126 are repeated. That is, the nominal current capacity for the next work 12 is calculated and stored in the corresponding record of the nominal capacity table TB7.

Then, in step S133,
When it is determined that the nominal current capacities for all the workpieces 12 have been registered in the nominal capacity table TB7, the processing by the current capacity processing means 90 ends.

As described above, in the current capacity measuring apparatus 10 according to the present embodiment, the current capacity is measured at the time of charging / discharging the regular battery 12 under a plurality of set ambient temperatures, and the temperature change is performed. Current capacity characteristic curve for
That is, a correction curve a (see FIG. 13) is obtained. Then
Actual current capacity measurement is performed on a large number of works 12, and after the measurement is completed, the characteristic curve b along the correction curve a is passed through the characteristic curve creating means 98 based on the detected temperature and the current capacity value for each work 12. Are generated, and the nominal capacity calculating means 100 calculates the nominal current capacities of all the works 12 based on the characteristic curve b for each work 12.

Normally, in the current capacity measurement, the work 1
When the 2 itself generates heat, the current capacity value of the work 12 generally increases, and takes a value far from the actual nominal current capacity. That is, when the work 12 itself generates heat, the nominal current capacity cannot be obtained with high accuracy.

However, in the current capacity measuring device 10 according to the present embodiment, based on the correction curve a, the correction value under the temperature increase due to the heat generation and the temperature under the prescribed temperature for obtaining the nominal current capacity are obtained. Since the reference value can be obtained,
By comparing the correction value derived from the correction curve a with the current capacity value of the work 12 and adding the change to the reference value, the nominal current capacity for all the works 12 can be easily and accurately obtained. be able to.

On the other hand, when measuring the current capacity value for each of a large number of works 12, the ambient temperature distribution cannot be made uniform because the space for the measurement is widened. The values vary, and it becomes impossible to measure the current capacity accurately for all the works 12.

However, in the current capacity measuring apparatus 10 according to the present embodiment, since the current capacity value of each work 12 can be corrected based on the correction curve a serving as a reference, the temperature distribution in the measurement space is not good. Even if uniform, all nominal current capacities in a number of workpieces 12 can be determined individually and accurately.

That is, the current capacity measuring device 10 according to the present embodiment can accurately measure the current capacity values of many works 12 irrespective of the rise or fall of the ambient temperature.

In the above embodiment, each work 12
Although the timing of temperature detection with respect to is immediately after the start of discharge, it is also possible to set other predetermined timings by appropriately changing the value of the predetermined value K. In addition, various timings such as a maximum temperature during operation, a subsequent temperature, and a temperature in a certain state (for example, at the start of charging or at the start of discharging) can be set.

In the above-described embodiment, the nominal current capacity is obtained from the current capacity in the discharge period T4. However, the current capacity in the charge period T3 alone or the current capacity in the charge period T3 and the discharge capacity in the discharge period T4 may be determined. The nominal current capacity may be determined based on

In the above embodiment, the nominal current capacity is obtained through the current capacity processing means (software) 90 incorporated in the computer 14.
Alternatively, the nominal current capacity may be obtained by configuring an arithmetic circuit with hardware including only digital circuits.

In the above embodiment, an example in which the present invention is applied to a cylindrical secondary battery has been described. However, the present invention can be applied to a button-type secondary battery and secondary batteries of various shapes.

The battery current capacity measuring device and the battery current capacity measuring method according to the present invention are not limited to the above-described embodiments, and may employ various configurations without departing from the gist of the present invention. Of course.

[0147]

As described above, according to the battery current capacity measuring apparatus according to the present invention, the temperature change obtained by appropriately setting the ambient temperature for at least the current capacity measurement at the time of discharging of a regular battery. Correction curve holding means for holding a current capacity characteristic curve as a correction curve, temperature detection means for detecting the temperature of the battery to be measured, current capacity measurement means for measuring at least the current capacity of the battery to be measured during discharge, A characteristic curve creation unit that creates a characteristic curve of the battery under test along the correction curve based on the temperature detected by the temperature detection unit and the current capacity obtained by the current capacity measurement unit; Current capacity calculating means for obtaining a nominal current capacity of the battery under measurement based on the current capacity.

Therefore, the effect that the current capacities of a large number of batteries can be measured accurately regardless of the rise or fall of the ambient temperature is achieved.

Further, according to the method for measuring the current capacity of a battery according to the present invention, the current capacity characteristic curve with respect to the temperature change obtained by appropriately setting the ambient temperature is measured for at least the current capacity of a regular battery at the time of discharging. As a correction curve, a characteristic curve of the battery under test is created along the correction curve based on the temperature of the battery under test and at least the current capacity of the battery under test at the time of discharging, and the characteristic curve is generated based on the characteristic curve. It is characterized in that the nominal current capacity of the measurement battery is obtained.

Therefore, the effect is obtained that the current capacities of a large number of batteries can be accurately measured regardless of the rise or fall of the ambient temperature.

According to the method for measuring the current capacity of a battery according to the present invention, the current capacity characteristic curve with respect to a temperature change obtained by appropriately setting the ambient temperature is measured for at least the current capacity of a regular battery at the time of discharging. A correction curve holding step of holding as a correction curve, a temperature detecting step of detecting a temperature of the battery under test, a current capacity measuring step of measuring at least a current capacity of the battery under test at the time of discharging, and the temperature detecting step. A characteristic curve creating step of creating a characteristic curve of the battery under test along the correction curve based on the measured temperature and the current capacity obtained in the current capacity measuring step; and And a current capacity calculating step of obtaining a nominal current capacity of the battery.

Therefore, the effect that the current capacities of a large number of batteries can be accurately measured regardless of the rise or fall of the ambient temperature is achieved.

[Brief description of the drawings]

FIG. 1 shows a battery current capacity measuring apparatus and a battery current capacity measuring method according to the present invention. The current capacity of a cylindrical secondary battery (hereinafter, simply referred to as a battery) such as a Ni—Cd battery or a lithium battery. 1 is a configuration diagram illustrating an example of an embodiment applied to capacitance measurement (hereinafter, simply referred to as a current capacity measurement device according to an embodiment).

FIG. 2 is a block diagram showing a hardware configuration of a computer mounted on the current capacity measuring device according to the present embodiment.

FIG. 3 is a configuration diagram showing a detection jig used in the current capacity measuring device according to the present embodiment.

FIG. 4 is a functional block diagram of a current capacity processing unit incorporated in the current capacity measurement device according to the present embodiment.

FIG. 5 is a special usage diagram showing a voltage waveform and a current waveform obtained by a general charge / discharge measurement.

FIG. 6 is a functional block diagram of a current capacity measurement unit and a correction curve creation unit in a current capacity processing unit in charge / discharge measurement of a regular battery in the current capacity measurement device according to the present embodiment.

FIG. 7 is a flowchart (part 1) illustrating processing operations of a current capacity measuring unit and a correction curve creating unit in charge / discharge measurement of a regular battery.

FIG. 8 is a flowchart (part 2) illustrating processing operations of a current capacity measuring unit and a correction curve creating unit in charge / discharge measurement of a regular battery.

FIG. 9 is a functional block diagram of a current capacity measuring means, a temperature detecting means, a characteristic curve creating means, and a nominal capacity calculating means in a current capacity processing means in charge / discharge measurement for a large number of works.

FIG. 10 is a flowchart showing a processing operation in charge / discharge measurement for a large number of works, in particular, a processing operation of a current capacity measuring unit during a charging period.

FIG. 11 is a flowchart showing processing operations in charge / discharge measurement for a large number of workpieces, particularly processing operations of a current capacity measuring unit and a temperature detecting unit during a discharge period.

FIG. 12 is a flowchart showing processing operations in charge / discharge measurement for a large number of works, particularly processing operations of a characteristic curve creating unit and a nominal capacity calculating unit.

FIG. 13 is an explanatory diagram illustrating the concept of a correction curve and a characteristic curve created by a correction curve creation unit and a characteristic curve creation unit.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Current capacity measuring device 12 ... Battery (regular battery, work) 14 ... Computer 16 ... Constant voltage circuit 18 ... Constant current circuit 20 ... Discharge circuit 22 ... Constant current voltage switching circuit 24 ... Current measuring circuit 26 ... Voltage measuring circuit 28 temperature measuring circuit 38 external storage device 60 detection jig 62 container 64 fixed base 66 upper contact 72 lower contact 82 surface contact 90 current capacity processing means 92 current capacity measuring means 94 ... Correction curve creation means 96 ... Temperature detection means 98 ... Characteristic curve creation means 100 ... Nominal capacity calculation means 102 ... Multiplication means 104 ... Charging accumulation means 106 ... Discharge accumulation means 108 ... Correction curve processing means 110 ... Correction value processing means

Claims (9)

[Claims] 1. A correction curve holding means for holding, as a correction curve, a current capacity characteristic curve with respect to a temperature change obtained by appropriately setting an ambient temperature, at least for measuring a current capacity of a regular battery at the time of discharging, and a battery to be measured. Temperature detection means for detecting the temperature of the battery; current capacity measurement means for measuring at least the current capacity of the battery under test; and the temperature detected by the temperature detection means and the current obtained by the current capacity measurement means. A characteristic curve creation unit that creates a characteristic curve of the battery under test along the correction curve based on the capacity; and a current capacity calculation unit that calculates a nominal current capacity of the battery under test based on the characteristic curve. An apparatus for measuring the current capacity of a battery. 2. The battery current capacity measuring device according to claim 1, wherein said temperature detecting means measures at least the surface temperature of the battery to be measured at the start of discharging. 3. The battery current capacity measuring device according to claim 1, wherein the current capacity measuring means multiplies a current value of the battery to be measured measured at a predetermined sampling time by a predetermined sampling time. A current capacity measuring device for a battery, comprising: multiplying means for obtaining a unit current capacity; and accumulating means for obtaining a current capacity by accumulating the unit current capacity calculated every predetermined sampling time until the end of measurement. . 4. The current capacity measuring device for a battery according to claim 1, wherein said characteristic curve creating means corresponds to a correction value corresponding to said temperature and a specified temperature based on said correction curve. Correction curve processing means for obtaining a reference value to be performed, and correction value processing means for obtaining a change amount between the current capacity value and the correction value, wherein the current capacity calculation means corrects the change amount to the reference value. A current capacity measuring device for a battery, wherein the nominal current capacity is obtained by the above method. 5. A current capacity characteristic curve with respect to a temperature change obtained by appropriately setting an ambient temperature in at least a current capacity measurement of a regular battery at the time of discharging is used as a correction curve, wherein the temperature of the battery to be measured and the battery to be measured are corrected. Generating a characteristic curve of the battery under test along the correction curve at least based on the current capacity at the time of discharging, and obtaining a nominal current capacity of the battery under test based on the characteristic curve. Current capacity measurement method. 6. A correction curve holding step of holding, as a correction curve, a current capacity characteristic curve with respect to a temperature change obtained by appropriately setting an ambient temperature, at least in measuring a current capacity of a regular battery at the time of discharging; A temperature detection step of detecting a temperature of the battery, a current capacity measurement step of measuring at least a current capacity of the battery under test at the time of discharging, and a temperature obtained in the temperature detection step and a current obtained in the current capacity measurement step. A characteristic curve creating step of creating a characteristic curve of the battery under test along the correction curve based on the capacity; and a current capacity calculating step of calculating a nominal current capacity of the battery under test based on the characteristic curve. A method for measuring current capacity of a battery. 7. The battery current capacity measuring method according to claim 6, wherein the temperature detecting step measures at least a surface temperature of the battery to be measured at the start of discharging. 8. The method for measuring the current capacity of a battery according to claim 6, wherein the current capacity measuring step comprises multiplying a current value of the battery to be measured measured at a predetermined sampling time by a predetermined sampling time. A method for measuring a current capacity of a battery, comprising: a multiplication step of obtaining a unit current capacity; and an accumulating step of obtaining the current capacity by accumulating the unit current capacity calculated every predetermined sampling time until the end of measurement. . 9. The method for measuring the current capacity of a battery according to claim 6, wherein the step of creating the characteristic curve corresponds to a correction value corresponding to the temperature and a specified temperature based on the correction curve. A correction curve processing step of obtaining a reference value to be performed, and a correction value processing step of obtaining a change amount between the current capacity value and the correction value.The current capacity calculation step corrects the change amount to the reference value. A current capacity measurement method for the battery.