JP2002286820A - Battery remainder-detecting apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect battery remainder more accurately. SOLUTION: A current detector 3 detects the charge current and/or discharge current of a battery 1. A first A/D converter 8 converts the output of the current detector 3 into a digital value. A first storage 10 stores the current output of the first A/D converter 8, and outputs the value being one period before of the first A/D converter 8. A first subtractor 12 subtracts the output of the first storage 10 from the current output of the first A/D converter 8. A voltage detector 7 detects the voltage across the terminals of the battery 1 as an electric signal. A second A/D converter 9 converts the output of the voltage detector 7 into a digital value. A second storage 11 stores the current output of the second A/D converter 9, and outputs a value being one period before of the second A/D converter 9. A second subtractor 13 subtracts the output of the second storage 11 from the current output of the second A/D converter 9. A divider 14 outputs the internal resistance value of the battery 1. A multiplier 14' performs multiplication of a constant number for correcting a conversion ratio. An internal resistance-battery remainder converter 15 obtains battery remainder.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery level detecting device for detecting a battery level.

[0002]

2. Description of the Related Art FIG. 5 is a block diagram showing a battery remaining amount detecting device according to the prior art. As shown in the figure, the current detector 3 is provided by a circuit in which the battery 1 and the load 2 acting on the power of the battery and / or the charging device 2 ′ for charging the battery 1 are connected in parallel with the battery 1. The charge and discharge currents of the battery 1 are detected, and the physical quantities are output as electric signals.

[0003] The A / D converter 4 'is composed of the above-described current detector 3
Is converted into a digital value at an arbitrary cycle T and output. The integrator 4 integrates the digital output value of the A / D converter 4 and calculates the integrated value of the charging and discharging currents of the battery 1. The first constant unit 6 gives the time rate capacity of the battery 1 in a 100% charged state.

[0004] A divider 5 divides the output of the integrator 4 by a value given by the first constant unit 6. Second constant unit 32
Gives the initial value of the remaining battery value. The adder 31
The output of the divider 5 and the output of the second constant unit 32 are added. The conventional battery remaining amount detection device outputs the output of the adder 31 as a ratio of the battery remaining amount to the 100% charged state.

In the above-mentioned prior art, the remaining battery is calculated only by detecting the charge and discharge currents of the battery 1.

According to this conventional technique, there are the following problems. Due to heat generated by a conductor or a chemical reaction in the battery 1 or the like, not all the energy calculated from the detected current is charged to the battery 1 and even if the discharge current from the battery 1 is 0 A, Since the remaining battery capacity decreases due to the self-discharge in the battery, the error in the remaining battery capacity increases with time.

[0007]

There is a demand for a battery remaining amount detecting device capable of deriving a battery remaining amount with higher accuracy.

An object of the present invention is to provide a battery remaining amount detecting device capable of detecting the remaining battery amount with higher accuracy.

It is another object of the present invention to provide a battery remaining amount detecting device capable of obtaining a battery remaining amount ratio in which the detection error is prevented from increasing with time.

Still another object of the present invention is to reduce the detection error even when the amount of change in the detected value of the current or voltage of the battery is small and is affected by disturbance noise. It is to provide a quantity detection device.

Still another object of the present invention is to obtain a remaining battery ratio in which the detection error is prevented from increasing with time, and to reduce the change in the detected value of the current or the voltage, and to reduce disturbance noise. It is an object of the present invention to provide a battery remaining amount detecting device that can reduce the detection error even when the battery is affected by the above.

[0012]

Means for solving the problem are described as follows. The technical matters corresponding to the claims in the expression are appended with numbers, symbols, and the like. The numbers, symbols, etc. clarify the correspondence / correspondence between the technical matter corresponding to the claim and the technical matter of at least one of the plural forms of implementation. It is not intended to show that technical matters are limited to the technical matters of the embodiments.

A battery remaining amount detecting device according to the present invention is a battery remaining amount detecting device for detecting a remaining amount of a battery (1), and an internal resistance deriving section (12) for obtaining an internal resistance of the battery (1) as an instantaneous value. 3 to 14 ′), and a battery remaining amount deriving unit (15) for calculating the remaining amount of the battery (1) based on the internal resistance.

[0014] In the battery remaining amount detecting device of the present invention,
The internal resistance deriving unit (3 to 14 ′) is configured to determine a change amount (ΔI) of a charging current and / or a discharging current of the battery (1).
And the internal resistance is derived based on the amount of change (ΔV) in the voltage of the battery (1).

A battery remaining amount detecting device according to the present invention is a battery remaining amount detecting device for detecting a remaining amount of a battery (1), and an internal resistance deriving section (12) for obtaining an internal resistance of the battery (1) as an instantaneous value. 3 to 14 '), a first battery remaining amount deriving unit (15) for obtaining a remaining amount of the battery (1) as a first remaining amount value based on the internal resistance, and a charging current of the battery (1). And / or a second battery remaining power deriving unit (4) for obtaining the remaining power of the battery (1) as a second remaining power value based on the integrated value obtained by integrating the detected values of the discharge current.
31), and an average value calculating unit (30) for detecting an average value of the first remaining amount value and the second remaining amount value as a remaining amount of the battery (1).

A battery remaining amount detecting device according to the present invention is a battery remaining amount detecting device for detecting a remaining amount of a battery (1), wherein a change amount (ΔI) of a charging current and / or a discharging current of the battery (1) is detected. ) And an internal resistance deriving unit (3 to 14 ′) that derives an internal resistance of the battery (1) as an instantaneous value based on a change amount (ΔV) of a voltage of the battery (1).
A battery remaining amount deriving unit (23) for determining a remaining amount of the battery (1) based on the internal resistance in response to a control signal; and a charging current and / or discharging current of the battery (1). The change amount (ΔI) is compared with a preset first threshold value, and the charging current and / or
Alternatively, the first determination unit (18) that determines whether the change amount (ΔI) of the discharge current is large, the change amount (ΔV) of the voltage of the battery (1), and a predetermined second threshold value A second determination unit (19) that determines whether the voltage change amount (ΔV) is greater than the second threshold value,
The determination result of the determination unit (18) and the second determination unit (1
9) a control signal generator (2) that outputs the control signal to the remaining battery level deriving unit (23) based on the determination result.
2).

The battery remaining amount detecting device according to the present invention is a battery remaining amount detecting device for detecting the remaining amount of the battery (1), wherein a change amount (ΔI ) And an internal resistance deriving unit (3 to 14 ′) that derives an internal resistance of the battery (1) as an instantaneous value based on a change amount (ΔV) of a voltage of the battery (1).
And determining a remaining amount of the battery (1) as a first remaining amount value based on the internal resistance in response to the control signal.
A battery remaining amount deriving unit (23), a change amount (ΔI) of a charging current and / or a discharging current of the battery (1) is compared with a first threshold value set in advance, and is compared with the first threshold value. A first determination unit (18) for determining whether the change amount (ΔI) of the charge current and / or the discharge current is large; a change amount (ΔV) of the voltage of the battery (1); A second determination unit (19) that determines whether the voltage change amount (ΔV) is greater than the second threshold value by comparing the second threshold value with the second threshold value, and a determination by the first determination unit (18). A control signal generation unit (22) that outputs the control signal to the first battery remaining amount derivation unit (23) based on the result and the determination result of the second determination unit (19); Based on the integrated value obtained by integrating the detected values of the charging current and / or the discharging current, Second battery remaining amount derivation unit for determining the remaining amount of terry (1) as a second remaining amount value (4-31),
An average value calculator (30) is provided for detecting an average value of the first remaining amount value and the second remaining amount value as a remaining amount of the battery (1).

According to the present invention, there is provided a battery remaining amount detecting device for detecting and outputting a charge current and a discharge current of a battery, and an analog output value of the current detector. A first A / D converter (8) for converting into a digital value at a period (T) of the first A / D converter and outputting the digital value, storing a current output of the first A / D converter (8), and A first storage device (10) for outputting a value one cycle earlier than the current value of the A / D converter (8), and a current output of the first A / D converter (8). The first storage device (1
0), a first subtracter (12) for reducing the output of the battery (1), a voltage detector (7) for detecting the voltage of the battery (1), and an analog output value of the voltage detector (7) for an arbitrary period T A / D converter (9) for converting into a digital value and outputting the same
A second output that stores a current output of the second A / D converter (9) and outputs a value one cycle earlier than the current of the second A / D converter (9). Storage device (11),
A second subtractor (13) for subtracting the output of the second storage device (11) from the current output of the second A / D converter (9), and the second subtractor (13) A divider (14) that outputs an internal resistance value of the battery (1) by dividing an output value of the battery by an output value of the first subtractor (12);
A constant multiplier (14) for multiplying the output of the divider (14) by a constant multiplier for correcting the output based on the conversion ratio of the current detector (3) and the voltage detector (7); ) Which converts the output of (2) from a known internal resistance-battery remaining capacity characteristic given in advance to a remaining battery capacity (15).

In the battery remaining amount detecting device of the present invention,
Further, an integrator (4) for integrating the output of the first A / D converter (8) to calculate a current integrated value of charging and discharging current of the battery (1); 1
A first constant unit (6) for providing a time rate capacity in a 00% charged state; and a second divider () for dividing an output of the integrator (4) by a value provided by the first constant unit (6). 5), an adder (31) for adding the output of the second divider (5) and the output of a second constant unit (32) for giving an initial value of the remaining battery value, and the adder (31). ) And an average value calculator for calculating an average value of the output of the internal resistance-battery remaining power converter (15).

[0020] In the battery remaining amount detecting device of the present invention,
Further, a first absolute value converter (16) for outputting an absolute value of an output of the first subtractor (12), and charging and charging of the battery (1) determined from a noise level in an environment in which the device is used. A first constant unit (20) for providing a threshold value for determining whether the change amount of the discharge current is valid or invalid; an output of the first absolute value converter (16) and the first constant unit (20); 2
A first comparator (18) that compares the threshold value given by 0) to determine validity or invalidity, and a second subtractor (13).
Second absolute value converter (17) for outputting the absolute value of the output of
And a second constant unit (21) for providing a threshold value for determining whether the amount of change in the voltage of the battery (1) determined from the noise level in the environment of use is valid or invalid.
And the output of the second absolute value converter (17) and the second absolute value converter (17).
Comparing the threshold value provided by the constant unit (21) of
A second comparator (19) for determining invalidity, and a determiner for determining validity only when both the outputs of the first comparator (18) and the second comparator (19) are valid. 22)
A divider (14) for outputting an internal resistance value of the battery (1) by dividing an output value of the second subtractor (13) by an output value of the first subtractor (12); A constant multiplier (14 ') for multiplying the output of the divider (14) by a constant multiplier for correcting the output based on the conversion ratios of the current detector (3) and the voltage detector (7); 14 ') is converted from a predetermined known internal resistance-battery remaining amount characteristic to a battery remaining amount, and if the output of the determination unit (22) is invalid, the converted output is invalidated and is valid. If so, an internal resistance-battery remaining power converter (23) for outputting the converted output as it is, and the determiner (22)
If the output is valid, the output signal of the internal resistance-battery remaining power converter (23) is stored and its value is output. If the output of the decision unit (22) is invalid, the output signal is stored. And a third storage device (24) for outputting the stored value.

[0021] In the battery remaining amount detecting device of the present invention,
An integrator (4) that integrates the output of the first A / D converter (8) and calculates a current integrated value of charging and discharging current of the battery (1); and 100% of the battery (1).
A first constant unit (6) for providing a time rate capacity in a charged state; and a first divider (5) for dividing an output of the integrator (4) by a value provided by the first constant unit (6). An adder (31) for adding the output of the first divider (5) and the output of a fourth constant unit (32) for giving an initial value of the remaining battery value; An average value calculator (30) for obtaining an average value of the output and the output of the third storage device (24) is provided.

[0022]

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

(First Embodiment) FIG. 1 is a diagram showing a first embodiment of a battery remaining amount detecting device according to the present invention. In the drawings described below, the same reference numerals are given to parts common to FIG.

As shown in FIG. 1, a load 2 acting on the battery 1 and / or a charging device 2 'for charging the battery 1 are connected in parallel to the battery 1.

The current detector 3 detects the charging and discharging currents of the battery 1 and outputs the physical quantities as electric signals.

The first A / D converter 8 converts the analog output value of the current detector 3 into a digital value at an arbitrary period T and outputs the digital value. The first storage device 10 stores the first A /
The current output of the D converter 8 is stored, and the first A /
The value one cycle before the D converter 8 is output. First subtractor 1
2 subtracts the output of the first storage device 10 from the current output of the first A / D converter 8.

The voltage detector 7 detects the terminal voltage value of the battery 1 as an electric signal. Second A / D converter 9
Converts the analog output value of the voltage detector 7 into a digital value at an arbitrary period T and outputs the digital value. Second storage device 11
Stores the current output of the second A / D converter 9 and outputs the value one cycle before the second A / D converter 8. The second subtractor 13 subtracts the output of the second storage device 11 from the current output of the second A / D converter 9.

The divider 14 outputs the internal resistance value of the battery 1 by dividing the output value of the second subtractor 13 by the output value of the first subtractor 12. Constant multiplier 14 '
Multiplies the output of the divider 14 by a constant multiple for correcting the conversion ratio of the current detector 3 and the voltage detector 7. The internal resistance-battery remaining amount converter 15 converts the output of the above-mentioned constant multiplier 14 'from a predetermined internal resistance / battery remaining amount characteristic to a battery remaining amount.

Next, the operation of the first embodiment will be described.

For example, a current detector 3 such as a CT or a shunt resistor takes out the current value of the discharging and charging current of the battery 1 as an arbitrary voltage value. The voltage value is converted into a digital value by the first A / D converter 8. A / D converter 8 described above
Is repeatedly converted at a sampling period T.

Next, one of the current output values of the A / D converter 8 is temporarily stored in the first storage device 10.
The current output value of the other A / D converter 8 (for example, if I
1) is an input of the first subtractor 12. The discharge and charge current values (tentatively I0) of the battery 1 sampled one cycle (T) earlier from the first storage device 10 are further input to the subtractor 12. In the first adjuster 12, I1-I0 is calculated, and the result is output as the current change amount ΔI.

Similarly, for the voltage, one of the current output values of the above-mentioned A / D converter 9 is temporarily stored in the first storage device 11. One of the current output values of the other A / D converter 9 (tentatively V1) is input to the second subtractor 13. The voltage value (tentatively V0) of the battery 1 sampled one cycle (T) earlier from the second storage device 11 is further input to the subtractor 13. Second
The adder / subtractor 13 calculates V1-V0 and outputs the result as a voltage change amount ΔV.

From the current change amount ΔI and the voltage change amount ΔV, the divider 14 calculates ΔV / ΔI. The output of the divider 14 is multiplied by a constant multiplier 14 ′ for correcting the conversion ratio of the current detector 3 and the voltage detector 7. For example, the detection ratio of the current detector 3 is 10 A / V, and the voltage detector 7
Is 4V / V, the constant multiplier 14 'outputs 4 /
Multiply by 10.

Therefore, the output of the multiplier 14 'is
Of the internal resistance. Although the internal resistance value and the remaining battery level differ for each battery, they have a 1: 1 relationship. The relationship is obtained in advance, and the internal resistance-battery remaining power converter 15 uses the characteristic to obtain the relationship. Remaining amount (generally 1
(The ratio of the current battery charge capacity to the 00% charge capacity).

If the internal resistance-battery remaining power converter 15 stores data indicating the above characteristics as a table, for example,
The remaining battery ratio corresponding to the calculated internal resistance value can be derived. If the calculated internal resistance value does not match the internal resistance value existing in the table, it goes without saying that the calculated internal resistance value is complemented using the ratio from the value before and after the calculated internal resistance value.

According to the first embodiment, it is possible to derive the remaining battery level based on the instantaneous value, and it is possible to suppress an increase in error even when measurement is performed for a long time.

(Second Embodiment) FIG. 2 is a diagram showing a second embodiment in which the configuration of the battery remaining amount detecting device of FIG. 1 is changed. Note that, in the drawings described below,
1 are denoted by the same reference numerals, and redundant description will be omitted.

FIG. 2 shows a second embodiment of the battery remaining power detecting device according to the present invention. The second embodiment is a combination of the first embodiment and the conventional technique.

In the second embodiment, in addition to the first embodiment shown in FIG. 1, an integrator 4, a first constant unit 6, and a second
, An adder 31, and an average calculator 30.

The integrator 4 integrates the output of the A / D converter 8 and calculates the integrated value of the charging and discharging currents of the battery 1 described above. The first constant unit 6 is a component of the battery 1.
Gives the time rate capacity in a 00% charged state. The second divider 5 divides the output of the integrator 4 by a value provided by the first constant unit 6. The adder 31 is connected to the second divider 5
Is added to the output of the second constant unit 32 that gives the initial value of the remaining battery value. The average value calculator 30 calculates the average value of the output of the adder 31 and the output of the internal resistance-battery remaining power converter 15 which is the final output of the first embodiment.

Next, the operation of the second embodiment will be described. The second embodiment shown in FIG. 2 is a combination of the first embodiment shown in FIG. 1 and a conventional method.

The output of the first A / D converter 8 is integrated by the integrator 4. In deriving the remaining amount of the battery, the unit of time for integration is generally one hour. For example, if the battery is discharged at 60 A for 60 seconds, the current integrated value becomes −6 when the discharging direction is represented by a negative value.
0A × 60 seconds ÷ 60 minutes ÷ 60 seconds = −1Ah. Becomes However, since the data is not normalized at this stage, a converted value equivalent to -1 Ah is output.

The output of the integrator 4 is divided by a divider 5 into
A voltage value corresponding to the capacity of the battery in a 100% charged state (generally, the rated capacity of the battery), that is, the current detector 3
The charge or discharge current is divided by a value converted by the same ratio converted into an arbitrary voltage value.

The output value of the divider 5 and the second constant unit 32
Is added by the adder 31 to the ratio indicating the current remaining battery amount with respect to the first rated battery capacity (hereinafter, the first remaining battery ratio).

The output of the internal resistance-battery remaining power converter 15, which is the final output of the first embodiment shown in FIG. 1, that is, the ratio indicating the current remaining battery level to the second battery rated capacity (hereinafter referred to as the second battery level) The average value of the remaining battery ratio) and the average value of the first remaining battery ratio are obtained by the average value calculator 30, so that the battery remaining ratio which has been prevented from increasing as the time elapses, which is a problem of the related art, Is obtained.

(Third Embodiment) FIG. 3 shows a third embodiment of the battery remaining power device according to the present invention.

In the third embodiment, the first embodiment has a function of judging whether the value calculated based on the amount of change in the voltage and current of the battery 1 is valid or invalid.

In the third embodiment, in addition to the first embodiment shown in FIG. 1, a first absolute value converter 16, a first constant unit 20, a first comparator 18, and a second Absolute value converter 1
7, a second constant unit 21, a second comparator 19, a decision unit 22, a divider 14, a constant multiplier 14 ', and an internal resistance −
It has a battery remaining power converter 23 and a third storage device 24.

The first absolute value converter 16 outputs the absolute value of the output of the first subtractor 12. The first constant unit 20 is
A threshold value is provided for determining whether the amount of change in the charge and discharge current of the battery 1 determined from the noise level under the environment in which the battery is used is valid or invalid. The first comparator 18 outputs the output of the first absolute value converter 16 and the first constant
The threshold value given by 0 is compared to determine validity or invalidity.

The second absolute value converter 17 outputs the absolute value of the output of the second subtractor 13. The second constant unit 21 is
A threshold value is provided for determining whether the amount of change in the voltage of the battery 1 is valid or invalid, which is determined from a noise level in a used environment. The second comparator 19 compares the output of the second absolute value converter 17 with the threshold value provided by the second constant unit 21 to determine validity or invalidity.

The determiner 22 determines that the output is valid only when the outputs of the first and second comparators 18 and 19 are both valid. The divider 14 divides the output value of the second subtractor 13 shown in the first embodiment by the output value of the first subtractor 12 shown in the first embodiment to obtain the internal resistance value of the battery 1. Is output. The multiplier 14 'is the same as the divider 14
Is multiplied by a constant multiple for correcting the conversion ratio in the current detector 3 and the voltage detector 7.

The internal resistance-battery remaining amount converter 23 converts the output of the above-mentioned constant multiplier 14 ′ into a battery remaining amount based on a given internal resistance-battery remaining amount characteristic. If invalid, the converted output is invalidated, and if valid, the converted output is output as it is. When the output of the determiner 22 is valid, the third storage device 24 stores the output signal of the internal resistance-battery remaining power converter 23 and outputs the value, and outputs the output signal of the determiner 22. If is invalid, the stored value is output.

Next, the operation of the third embodiment will be described.

In the third embodiment shown in FIG. 3, the first embodiment shown in FIG. 1 is provided with a function of determining whether the value calculated based on the amount of change in the voltage and current of the battery 1 is valid or invalid. .

In addition to those shown in the first embodiment, the first
The absolute value of the output of the subtractor 12 is converted to a first absolute value converter 16
Ask for. This output is compared by the first comparator 18 with the value provided by the first constant unit 20. If the output of the first absolute value converter 16 is larger than the threshold value, it is determined that the output is valid.

Similarly, for the voltage, the absolute value of the output of the second subtractor 9 is obtained by the second absolute value converter 17.
This output is compared with the value provided by the second constant unit 21 by the second comparator 19. If the output of the second absolute value converter 17 is larger than the threshold value, it is determined that the output is valid.

When both the current variation and the voltage variation are valid, the decision unit 22 supplies a signal indicating that the validity is valid to the internal resistance-battery remaining power converter 23 and the third storage device 24. If at least one of them is invalid, the determiner 22 gives a signal indicating invalidity to the internal resistance-battery remaining power converter 23 and the third storage device 24.

Upon receiving the invalidation signal, the internal resistance-battery remaining power converter 23 discards the remaining battery percentage derived in the current sampling cycle. When the valid signal is received, the remaining battery ratio derived in the current sampling period is output to the third storage device 24. The third storage device 24 that has received the invalidation signal continuously outputs the value output one cycle before. When the valid signal is received, the battery remaining ratio output from the internal resistance-battery remaining amount converter 23 is stored and output.

According to the present embodiment, the error can be reduced even when the amount of change in the current or the voltage is small or even when it is affected by disturbance noise.

(Fourth Embodiment) FIG. 4 shows a fourth embodiment of the battery remaining power detecting device according to the present invention. 4th
The embodiment is a combination of the third embodiment and the conventional technology. The present invention includes an integrator 4, a first constant unit 6, and a first divider 5 in addition to the third embodiment shown in FIG.
, An adder 31, and an average value calculator 30.

The integrator 4 integrates the output of the first A / D converter 8 and calculates the integrated value of the charging and discharging currents of the battery 1 described above. The first constant unit 6 includes the battery 1 described above.
At a 100% state of charge. First
Divides the output of the integrator 4 by the value given by the first constant unit 6. The adder 31 adds the output of the first divider 5 and the output of the fourth constant unit 32 that gives the initial value of the remaining battery value. The average calculator 30 calculates the output of the adder 31 and the third output which is the final output of the third embodiment.
The average value of the output of the storage device 24 is obtained.

Next, the operation of the fourth embodiment will be described. The fourth embodiment shown in FIG. 4 is a combination of the third embodiment shown in FIG. 3 and a conventional method.

The output of the first A / D converter 8 similar to that shown in the third embodiment is integrated by the integrator 4. In deriving the remaining battery charge, the unit of time for integration is generally 1
For example, when discharging is performed at 60 A for 60 seconds, the integrated current value is −60 A × 60 seconds ÷ 60 when the discharging direction is represented by a negative value.
Minutes / 60 seconds = -1Ah. Becomes However, since the data is not normalized at this stage, a converted value equivalent to -1 Ah is output.

The output of the integrator 4 is divided by the divider 5 into
A voltage value corresponding to the capacity of the battery in a 100% charged state (generally, the rated capacity of the battery), that is, the current detector 3
The charge or discharge current is divided by a value converted by the same ratio converted into an arbitrary voltage value. The output value of the divider 5 and the fourth
Is added by the adder 31 to the remaining amount initial value given by the constant unit 32 of the above (1), a ratio indicating the current remaining amount of the battery to the first rated battery capacity (hereinafter referred to as a first remaining battery ratio) is derived. .

The output of the third storage device 24, which is the final output of the third embodiment shown in FIG. 3, that is, the ratio indicating the current remaining battery level to the second rated battery capacity (hereinafter the second remaining battery ratio) ) And the average value of the first remaining battery ratio. Thus, according to the fourth embodiment, it is possible to obtain the remaining battery ratio in which the error is suppressed from increasing with time, which is a problem of the related art. Further, the error can be reduced even when the amount of change in the current or the voltage is small and when the amount of influence is due to disturbance noise.

[0066]

As described above, according to the present invention,
Since the remaining battery power is derived from the instantaneous value and the increase in the remaining battery detection error is suppressed, the remaining battery power can be detected with higher accuracy.

[Brief description of the drawings]

FIG. 1 is a diagram showing a first embodiment of a battery remaining power detection device according to the present invention.

FIG. 2 is a diagram showing a second embodiment in a case where the configuration of the battery remaining amount detecting device of FIG. 1 is changed.

FIG. 3 is a diagram showing a third embodiment in which the configuration of the battery remaining amount detecting device in FIG. 1 is changed.

FIG. 4 is a diagram showing a fourth embodiment in a case where the configuration of the battery remaining amount detecting device in FIG. 3 is changed.

FIG. 5 is a diagram illustrating an example of a conventional battery remaining power detection device.

[Explanation of symbols]

 Reference Signs List 3 current detector 4 integrator 5 first divider 6 first constant unit 7 voltage detector 8 first A / D converter 9 second A / D converter 10 first storage device 11 second Storage device 12 first subtractor 13 second subtractor 14 second divider 14 'constant multiplier 15 internal resistance-battery remaining amount converter 16 first absolute value converter 17 second absolute value conversion Unit 18 First comparator 19 Second comparator 20 Second constant unit 21 Third constant unit 22 Judgment unit 23 Internal resistance-battery remaining amount converter 24 Third storage device 30 Average value calculator 31 Addition Container 32 2nd constant device

Continued on the front page F term (reference) 2G016 CB06 CB12 CB22 CB23 CB32 CB33 CC01 CC03 CC04 CC07 CC16 CC23 CC24 CD02 CD03 CD14 5G003 AA01 BA01 CA01 CA11 DA04 EA05 5H030 AA06 AS20 FF41 FF42 FF43 FF44

Claims (9)

[Claims] 1. An apparatus for detecting a remaining amount of a battery, comprising: an internal resistance deriving unit that obtains an internal resistance of the battery as an instantaneous value; and a remaining amount of the battery based on the internal resistance. A battery remaining amount detecting device comprising: a battery remaining amount deriving unit to be sought. 2. The battery remaining amount detecting device according to claim 1, wherein the internal resistance deriving unit is configured to calculate a change amount of a charge current and / or a discharge current of the battery and a change amount of a voltage of the battery. A battery remaining amount detecting device for deriving the internal resistance. 3. An apparatus for detecting a remaining amount of a battery, comprising: an internal resistance deriving unit that obtains an internal resistance of the battery as an instantaneous value; and a remaining amount of the battery based on the internal resistance. A first battery remaining amount deriving unit for obtaining a first remaining amount value; and a second remaining amount based on an integrated value obtained by integrating detection values of the charging current and / or the discharging current of the battery. A battery remaining amount detecting device comprising: a second battery remaining amount deriving unit that obtains a value as a value; and an average value calculating unit that detects an average value of the first remaining amount value and the second remaining amount value as the remaining amount of the battery. . 4. A battery remaining amount detecting device for detecting a remaining amount of a battery, the battery remaining amount detecting device comprising: An internal resistance deriving unit that derives an internal resistance as an instantaneous value; a battery remaining amount deriving unit that determines a remaining amount of the battery based on the internal resistance in response to a control signal; A first determination unit that compares a change amount of the discharge current with a preset first threshold value, a second determination unit that compares a change amount of the battery voltage with a preset second threshold value, A battery remaining amount detection device comprising: a control signal generation unit that outputs the control signal to the battery remaining amount deriving unit based on a comparison result of the first determination unit and a comparison result of the second determination unit. 5. A battery remaining amount detecting device for detecting a remaining amount of a battery, the battery remaining amount detecting device comprising: An internal resistance deriving unit that derives an internal resistance as an instantaneous value; a first battery remaining amount deriving unit that determines a remaining amount of the battery as a first remaining amount value based on the internal resistance in response to a control signal; A first determination unit that compares a change amount of the charge current and / or the discharge current of the battery with a preset first threshold value; and a change amount of the battery voltage and a preset second threshold value. A second determination unit to be compared; a control signal generation unit that outputs the control signal to the first battery remaining amount derivation unit based on a comparison result of the first determination unit and a comparison result of the second determination unit; Charge power of the battery A second battery remaining power deriving unit that obtains the remaining power of the battery as a second remaining power based on an integrated value obtained by integrating the detected values of the flow and / or discharge current; A battery remaining amount detecting device, comprising: an average value calculating unit that detects an average value of the second remaining amount value as the remaining amount of the battery. 6. A current detector for detecting and outputting a charge current and a discharge current of a battery, and a first A / D converter for converting an analog output value of the current detector into a digital value at an arbitrary cycle and outputting the digital value. A first storage device for storing a current output of the first A / D converter and outputting a value of the first A / D converter one cycle before the current; From the current output of the first A / D converter to the first
A first subtractor for reducing the output of the storage device, a voltage detector for detecting the voltage of the battery, and a second converter for converting an analog output value of the voltage detector into a digital value at an arbitrary period T and outputting the digital value. An A / D converter; a second A / D converter that stores a current output of the second A / D converter and outputs a value that is one cycle earlier than the current of the second A / D converter. A storage device; and a second output from the current output of the second A / D converter.
A second subtractor for reducing the output of the storage device, and a divider for outputting an internal resistance value of the battery by dividing an output value of the second subtractor by an output value of the first subtractor. A constant multiplier that multiplies the output of the divider by a constant multiplier that corrects the output based on the conversion ratios of the current detector and the voltage detector; A battery remaining amount detecting device including an internal resistance-battery remaining amount converter for converting a quantity characteristic into a battery remaining amount. 7. The battery remaining amount detecting device according to claim 6, further comprising: integrating an output of the first A / D converter to calculate a current integrated value of charging and discharging currents of the battery. A first constant unit for providing a time rate capacity in a 100% charged state of the battery; a second divider for dividing an output of the integrator by a value provided by the first constant unit; An adder for adding the output of the divider and the output of a second constant unit that gives the initial value of the remaining battery value; and calculating the average value of the output of the adder and the output of the internal resistance-battery remaining converter. A battery remaining amount detecting device comprising an average value calculator to be obtained. 8. The battery remaining amount detection device according to claim 6, further comprising: a first absolute value converter that outputs an absolute value of an output of the first subtractor; and a noise level under a used environment. A first constant unit for providing a threshold value for determining whether the determined amount of change in the charge and discharge currents of the battery is valid or invalid; an output of the first absolute value converter and the first constant A first comparator for comparing the threshold value provided by the subtractor to determine whether the output is valid or invalid; a second absolute value converter for outputting an absolute value of an output of the second subtractor; A second constant unit for providing a threshold value for determining whether the amount of change in the battery voltage determined from the lower noise level is valid or invalid; an output of the second absolute value converter; Compare the thresholds provided by the constants of A second comparator to determine whether the output of the first comparator and the second comparator is valid only when both of the outputs are valid, and the output value of the second subtractor A divider that outputs an internal resistance value of the battery by dividing by an output value of a first subtractor; and an output of the divider is corrected based on conversion ratios of the current detector and the voltage detector. A constant multiplier for multiplying by a constant multiplier, and converting the output of the constant multiplier from a known internal resistance-battery remaining capacity characteristic given in advance to the remaining battery capacity, and converting the output if the output of the determiner is invalid. Disabled output,
An internal resistance-battery remaining amount converter that outputs the converted output as it is when it is valid; and an internal resistance-battery converter that outputs if the output of the determiner is valid.
A third storage device for storing an output signal of the battery remaining amount converter, outputting the value, and outputting the stored value when the output of the judging device is invalid. apparatus. 9. The battery remaining amount detection device according to claim 8, wherein an integrator that integrates an output of the first A / D converter to calculate a current integrated value of charge and discharge currents of the battery; A first constant unit that provides a time rate capacity in a 100% charged state of the battery; a first divider that divides an output of the integrator by a value provided by the first constant unit; and a first division An adder that adds the output of the adder and the output of a fourth constant unit that gives an initial value of the remaining battery value; and an average value calculator that calculates an average value of the output of the adder and the output of the third storage device A battery remaining amount detecting device comprising: