JP2007188767A - Battery condition monitoring device, battery condition monitoring system and battery condition monitoring method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a battery condition monitoring device for accurately obtaining internal resistance of a battery, an open voltage of the battery, a charging rate of the battery and the like. <P>SOLUTION: This battery condition monitoring device for monitoring a battery condition is provided with a microcomputer 2 having an internal resistance calculation part 4 where, when it is determined that battery discharge at a certain level or higher has occurred or when it is determined that a predetermined change other than that (for instance, a variation of a battery liquid temperature above a certain level, a variation of a battery voltage value at a certain level or higher or battery charge/discharge at a certain level or higher since previous battery internal resistance update) has occurred in the battery, the internal resistance of the battery is calculated by using each of them as a trigger. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a battery state monitoring device, a battery state monitoring system, and a battery state monitoring method, and more specifically, a battery state monitoring device for calculating an internal resistance of a battery, a battery open voltage, a battery charging rate, and the like. The present invention relates to a battery state monitoring system and a battery state monitoring method.

  As a power management system employed in a vehicle, a current (allowable discharge current) that can be taken out from the battery is calculated based on the open circuit voltage and internal resistance of the battery, and is mounted on the vehicle based on the allowable discharge current. There are some that restrict power supply to electronic devices and ensure stable power supply to highly important electronic devices.

  This is because a discharge exceeding the allowable discharge current occurs due to power supply to the electronic devices constituting the driving comfort system (for example, audio system, air conditioner system, seat heater system, etc.), and the driving safety system (for example, pre-crash) This is to prevent a situation in which electric power cannot be supplied to the electronic devices constituting the system and the brake assist system.

As a technique for calculating the open-circuit voltage of the battery, for example, in Patent Document 1 below, the battery voltage value when the battery current value converges around 0 [A] is used as the open-circuit voltage of the battery, and thereafter charge / discharge is performed. A technique of correcting by the amount of electricity (current integrated value) is disclosed.
However, the amount of charge / discharge electricity is obtained by integrating the current values of the battery, and there is a possibility that deviation of the integration occurs. In addition, since the deterioration state (that is, internal resistance) of the battery is not taken into account when the correction is performed using the charge / discharge electricity amount, the accuracy may be reduced when the battery is deteriorated. For this reason, when the correction by the charge / discharge electricity amount is continued for a long period of time, a large error may occur between the actual value of the open circuit voltage of the battery.

  The internal resistance of the battery is calculated using a large discharge (for example, discharge of 50 [A] or more) as a trigger, but the battery liquid temperature that affects the internal resistance, etc. This factor is not taken into account, so the calculation accuracy cannot be said to be high.

  By the way, as one of information necessary for appropriately executing vehicle control, there is a battery charging rate. In particular, the battery charge rate is very important in order to execute various controls in a hybrid electric vehicle that meets the demand for resource saving. A hybrid electric vehicle is a vehicle that includes an engine and a motor that operates with electric power from a battery.

As a technique for calculating the charging rate of the battery, for example, Patent Document 2 below discloses a technique of calculating the open voltage of the battery and calculating the charging rate of the battery from the open voltage of the battery. This utilizes the fact that the correlation as shown in FIG. 14 is established between the open circuit voltage of the battery and the charge rate of the battery.
However, as described above, unless the open-circuit voltage of the battery is accurately obtained, the charge rate of the battery cannot be accurately obtained, and appropriate charge control cannot be performed.
JP 2000-30748 A JP 2000-306613 A

Means for solving the problems and their effects

  The present invention has been made in view of the above problems, and is a battery state monitoring device, a battery state monitoring system, and a battery state monitoring for accurately obtaining an internal resistance of a battery, an open voltage of the battery, a charging rate of the battery, and the like. It aims to provide a method.

  In order to achieve the above object, the battery state monitoring device (1) according to the present invention, when it is determined in the battery state monitoring device that monitors the battery state that discharge of a certain magnitude or more has occurred, other predetermined changes When the battery is determined to have occurred in the battery, the battery internal resistance calculation means for calculating the internal resistance of the battery is provided using each as a trigger.

As described in the section “Background Art”, conventionally, the internal resistance of the battery is calculated only when a large discharge occurs as a trigger.
However, since the internal resistance of the battery is greatly affected by changes in the battery fluid temperature and the like, it is difficult to maintain a state where the error from the actual value is small only by using a case where a large discharge occurs as a trigger.

  According to the battery state monitoring device (1), not only when a discharge of a certain magnitude or more (for example, discharge of 50 [A] or more) occurs but also when a predetermined change other than that occurs in the battery (that is, In the case where it is recognized that there is a possibility that the internal resistance of the battery has changed more than a certain magnitude), the internal resistance of the battery is calculated using this as a trigger. Therefore, since the opportunity for calculating the internal resistance of the battery increases, it is possible to maintain a state in which an error from the actual value is small.

  As a result, the open circuit voltage of the battery can be maintained in a state where the error from the actual value is small, the calculation accuracy of the current that can be taken out from the battery (allowable discharge current) is increased, and the power supply to the electronic device is increased. Restrictions can be made more appropriately. Moreover, the calculation accuracy of the charging rate of the battery is increased, and charging control can be performed more appropriately.

  If the opportunity to calculate the internal resistance of the battery increases, the processing burden on the computer, etc. will increase, but if it is recognized that the internal resistance of the battery may have changed to some extent (when a change occurs in the battery) Since the calculation timing is limited, an increase in the processing load on a computer or the like can be suppressed within a necessary range.

The internal resistance R of the battery can be obtained from two sets of battery voltages Va and Vb and battery currents Ia and Ib (plus during charging and minus during discharging) as shown below.
R = (Vb−Va) / (Ib−Ia)
When three or more sets of battery voltages Va, Vb, Vc and battery currents Ia, Ib, Ic (plus during charging, minus during discharging) can be used, they can be obtained as follows.
R1 = (Vb−Va) / (Ib−Ia)
R2 = (Vc−Vb) / (Ic−Ib)
R = (R1 + R2) / 2

  Moreover, the battery state monitoring device (2) according to the present invention is a battery liquid temperature of a certain level or more from the time of the previous battery internal resistance calculation by the battery internal resistance calculation means in the battery state monitoring device (1). When there is a fluctuation, it is determined that the predetermined change has occurred in the battery.

  According to the battery state monitoring device (2), when the battery liquid temperature has changed more than a certain level since the previous battery internal resistance calculation, it is determined that the predetermined change has occurred in the battery. The internal resistance is calculated. The battery liquid temperature fluctuation rebounds on the ease of battery charge / discharge (battery internal resistance). The battery liquid is an electrolytic solution constituting the battery.

  That is, when it is recognized that there is a high possibility that the internal resistance of the battery has changed by a certain amount or more, it is determined that the certain change has occurred in the battery state, and the internal resistance of the battery is calculated. For example, when the battery liquid temperature increases by 10 [° C.] or the battery liquid temperature decreases by 10 [° C.], the internal resistance of the battery is calculated. Therefore, the internal resistance of the battery can be calculated and updated at an appropriate timing.

  Further, the battery state monitoring device (3) according to the present invention is the battery state monitoring device (1), in which the battery voltage value of a certain magnitude or more has been obtained since the previous battery internal resistance calculation by the battery internal resistance calculation means. When there is a fluctuation, it is determined that the predetermined change has occurred in the battery.

By the way, the charging / discharging action of the battery is caused by a chemical reaction between the electrolytic solution (battery solution) and an electrode composed of an anode and a cathode. At the time of discharge, positive charges are taken from H ⁺ (hydrogen ions) near the anode. When a positive charge is taken from H ⁺ , H ₂ (hydrogen) is generated near the electrode. This H ₂ obstructs the action of approaching the H ⁺ anode plate (PbO ₂ (lead dioxide)). That is, H ₂ generated in the vicinity of the electrode becomes an internal resistance, which disturbs the discharge action.

Further, this H ₂ does not remain in the vicinity of the electrode, and as time passes, it combines with O ₂ (oxygen) of the anode plate (PbO ₂ ) to become H ₂ O (water). As a result, the electrolytic solution becomes thin, and the battery performance decreases. In other words, when a discharge of a certain magnitude or more (battery voltage fluctuation of a certain magnitude or more) occurs, it is recognized that the battery performance is greatly deteriorated.

On the other hand, at the time of charging, on the basis of the principle opposite to that at the time of discharging, PbSO ₄ (lead sulfate) generated on the bipolar plate by the discharge and H ₂ O are combined to generate H ⁺ , resulting in a thin electrolyte solution. Becomes darker and battery performance is restored. That is, it is recognized that the battery performance is greatly increased when a charge of a certain magnitude or more (battery voltage fluctuation of a certain magnitude or more) occurs. Therefore, when charge / discharge exceeding a certain level (battery voltage fluctuation exceeding a certain level) occurs, it is highly likely that the battery performance has changed significantly. It is desirable to confirm.

According to the battery state monitoring device (3), when the battery voltage value fluctuates more than a certain level from the time of the previous battery internal resistance calculation, it is determined that the predetermined change has occurred in the battery. The internal resistance is calculated.
That is, when it is recognized that there is a high possibility that the battery performance has changed significantly, it is determined that the predetermined change has occurred in the battery, and the internal resistance of the battery is calculated. For example, when the battery voltage value increases by 0.3 [V] or the battery voltage value decreases by 0.3 [V], the internal resistance of the battery is calculated. Therefore, the internal resistance of the battery can be calculated and updated at an appropriate timing.

  Further, the battery state monitoring device (4) according to the present invention includes a battery discharge of a certain magnitude or more from the time of the previous battery internal resistance calculation by the battery internal resistance calculation means in the battery state monitoring device (1). Alternatively, when the battery is charged, it is determined that the predetermined change has occurred in the battery.

  As described above, when charging / discharging of a certain level or more (battery voltage variation of a certain level or more) occurs, it is recognized that there is a high possibility that the battery performance has greatly changed. It is desirable to confirm the transition.

According to the battery state monitoring device (4), it is determined that the predetermined change has occurred in the battery when the battery discharge or charge exceeds a certain level from the time of the previous battery internal resistance calculation. The internal resistance is calculated.
That is, when it is recognized that there is a high possibility that the battery performance has changed significantly, it is determined that the predetermined change has occurred in the battery, and the internal resistance of the battery is calculated. For example, when the charge / discharge electricity amount is increased by 1000 [Asec] (charge) or decreased by 1000 [Asec] (discharge), the internal resistance of the battery is calculated. Therefore, the internal resistance of the battery can be calculated and updated at an appropriate timing.

  Further, the battery state monitoring device (5) according to the present invention is the battery state monitoring device (2), wherein the battery state monitoring device (2) has a battery liquid of a certain size or more from the time of the previous battery internal resistance calculation by the battery internal resistance calculation means. When it is determined that there is a change in temperature and the predetermined change has occurred in the battery, the battery internal resistance calculation means corrects the internal resistance of the battery in accordance with the change in battery liquid temperature. .

  The fluctuation of the battery liquid temperature rebounds on the ease of charging / discharging the battery (that is, the internal resistance of the battery). As shown in FIG. 3 to be described later, the internal resistance of the battery has a temperature characteristic depending on the battery liquid temperature. If the battery liquid temperature increases, the internal resistance of the battery decreases, and conversely, if the battery liquid temperature decreases. The internal resistance of the battery increases.

  According to the battery state monitoring device (5), when the battery fluid temperature fluctuates more than a certain level from the time of the previous calculation of the battery internal resistance (that is, the internal resistance of the battery changes more than a certain level). When the battery liquid temperature is changed, the internal resistance of the battery is corrected according to the change in the battery fluid temperature, so that the internal resistance of the battery can be appropriately updated.

  Therefore, the open circuit voltage of the battery and the charge rate of the battery, which are obtained using the internal resistance of the battery, can be appropriately updated. Further, since it is not necessary to sample the battery voltage value or the battery current value, it is possible to greatly suppress an increase in processing load on the computer or the like.

  The battery state monitoring device (6) according to the present invention is a battery state monitoring device for monitoring a battery state. The battery internal resistance updating unit updates the internal resistance of the battery, and the battery internal resistance updating unit A battery open voltage calculating means for calculating the open voltage of the battery with the updated resistance as a trigger is provided.

  According to the battery state monitoring device (6), the open circuit voltage of the battery is calculated using the case where the internal resistance of the battery is updated as a trigger. Conventionally, since the update of the internal resistance of the battery has not been used as a trigger, the opportunity for calculating the open circuit voltage of the battery is increased, and a state in which an error from the actual value is small can be maintained.

  If the accuracy of the open-circuit voltage of the battery is increased, the calculation accuracy of the current that can be taken out from the battery (allowable discharge current) is also increased, and the power supply to the electronic device can be more appropriately restricted. Moreover, the calculation accuracy of the charging rate of the battery is increased, and charging control can be performed more appropriately.

  Further, as a method of calculating the open circuit voltage of the battery, as will be described in detail later, there is a method of calculating using the internal resistance of the battery. By adopting this calculation method, it is possible to take into account the deterioration state of the battery (that is, the internal resistance), so that the calculation accuracy of the open circuit voltage of the battery can be improved. Therefore, when the internal resistance of the battery is updated (that is, when the accuracy of the internal resistance of the battery itself increases), the open circuit voltage of the battery is calculated by using the internal resistance of the battery. Can be very high.

  Further, the battery state monitoring device (7) according to the present invention is a battery state monitoring device for monitoring a battery state, wherein the battery internal resistance updating means for updating the internal resistance of the battery and the battery charge / discharge are converged within a predetermined range. When the internal resistance of the battery is updated by the battery internal resistance update means, the battery open voltage calculation means for calculating the open voltage of the battery using each as a trigger is provided. .

  According to the battery state monitoring device (7), not only when the battery charge / discharge converges within a predetermined range, but also when the internal resistance of the battery is updated, the open circuit voltage of the battery is calculated as a trigger. Is done. This increases the opportunity to calculate the open circuit voltage of the battery, so that a state with a small error from the actual value can be maintained.

  If the accuracy of the open-circuit voltage of the battery increases, the accuracy of calculating the current (allowable discharge current) that can be taken out from the battery also increases, and it is possible to more appropriately limit the power supply to the electronic device. Moreover, the calculation accuracy of the charging rate of the battery is increased, and charging control can be performed more appropriately.

  In the battery state monitoring device (8) according to the present invention, when the battery state monitoring device (7) determines that the battery charge / discharge has converged within the predetermined range, the battery open voltage calculation means The battery voltage value when the battery charge / discharge converges within the predetermined range is used as the open circuit voltage of the battery.

According to the battery state monitoring device (8), when the charging / discharging of the battery converges within a predetermined range (that is, when the battery current hardly flows), the battery voltage value at that time is set as the open circuit voltage of the battery. .
The battery voltage when the battery current stops flowing (that is, when the battery current value is 0 [A]) is the open circuit voltage of the battery. Therefore, even if the battery voltage when the battery current almost stops flowing (for example, when the battery current value is within a range of ± 1 [A]) is handled as the open circuit voltage of the battery, there is no particular problem. Therefore, when the charge / discharge of the battery converges within the predetermined range, the open circuit voltage of the battery can be calculated appropriately.

  The battery state monitoring device (9) according to the present invention is a battery state monitoring device for monitoring a battery state, a battery open voltage update means for updating a battery open voltage, and a battery internal resistance for updating a battery internal resistance. At least one of the update means is provided, and at least one of the case where the battery open voltage is updated by the battery open voltage update means and the case where the battery internal resistance is updated by the battery internal resistance update means And a battery charge rate calculation means for calculating the battery charge rate.

As described in the section “Background Art”, since the correlation shown in FIG. 14 is established between the open circuit voltage of the battery and the charge rate of the battery, the charge rate of the battery is calculated from the open circuit voltage of the battery. Can be sought.
Further, the internal resistance of the battery affects the open circuit voltage of the battery. In other words, the internal resistance of the battery also affects the charging rate of the battery.

  According to the battery state monitoring device (9), when the open-circuit voltage of the battery is updated or when the internal resistance of the battery is updated, the charge rate of the battery is obtained. Therefore, the charging rate of the battery can be updated at an appropriate timing.

  The battery state monitoring device (10) according to the present invention is a battery state monitoring device that monitors a battery state, a battery charge rate calculation unit that calculates a battery charge rate based on an open voltage of the battery, The battery charging rate correction unit corrects the charging rate of the battery calculated by the battery charging rate calculation unit based on the internal resistance.

  According to the battery state monitoring device (10), the charging rate of the battery determined based on the open circuit voltage of the battery is corrected based on the internal resistance of the battery. As described above, the internal resistance of the battery also affects the charging rate of the battery. Therefore, the battery charge rate can be updated more appropriately by correcting the battery charge rate based on the internal resistance of the battery.

  The battery status monitoring device (11) according to the present invention is a battery status monitoring device that monitors the battery status, and determines that the battery charge / discharge has converged within a predetermined range. An open-circuit voltage update means; and an alternator adjusting means for adjusting an output voltage of the alternator so that the battery charge / discharge converges within the predetermined range when a certain condition is satisfied. It is characterized in that a predetermined time or more has elapsed since the last battery open voltage update by the updating means.

  The battery voltage when the battery current stops flowing (that is, when the battery current value is 0 [A]) is the open circuit voltage of the battery. Therefore, even if the battery voltage when the battery current almost stops flowing (for example, when the battery current value is within a range of ± 1 [A]) is handled as the open circuit voltage of the battery, there is no particular problem. Therefore, when the charge / discharge of the battery converges within the predetermined range, the open circuit voltage of the battery can be calculated appropriately.

According to the battery state monitoring device (11), the output voltage of the alternator is adjusted so that the battery charge / discharge converges within the predetermined range, and a situation in which the open circuit voltage of the battery is required is formed.
As a result, the operation rate of an electric load such as an ECU is high, the charging state is continued, the battery is fully charged, the discharging state is continued, and the battery current value does not converge around 0 [A]. However, it is possible to forcibly converge the battery current value to 0 [A] and obtain the open circuit voltage of the battery.
However, it is not preferable to force the battery current value to converge to 0 [A] frequently.

  According to the battery state monitoring device (11), when a predetermined time or more has passed since the last battery open voltage update (that is, when there is a high possibility that the error of the battery open voltage is large), The output voltage of the alternator is adjusted so that the discharge converges within the predetermined range, and the open circuit voltage of the battery is obtained. As a result, the battery current value is not forcibly converged more than necessary, so that the battery current value can be balanced.

  Moreover, the battery state monitoring system (1) according to the present invention is a battery state monitoring system for monitoring a battery state. The battery state monitoring unit for monitoring the battery state, and the battery state monitoring unit for monitoring the battery state, Battery internal resistance calculation means for calculating the internal resistance of the battery using each of them as a trigger when it is determined that a predetermined change has occurred in the battery. It is said.

  According to the battery state monitoring system (1), not only when a discharge of a certain magnitude or more (for example, discharge of 50 [A] or more) occurs but also when a predetermined change other than that occurs in the battery (that is, In the case where it is recognized that there is a possibility that the internal resistance of the battery has changed more than a certain magnitude), the internal resistance of the battery is calculated using this as a trigger. Therefore, since the opportunity for calculating the internal resistance of the battery increases, it is possible to maintain a state in which an error from the actual value is small.

  Further, the battery state monitoring method (1) according to the present invention is a battery state monitoring method for monitoring a battery state, when a discharge of a certain magnitude or more occurs, and when other predetermined changes occur in the battery, It has the step which calculates the internal resistance of a battery by using as a trigger.

  According to the battery state monitoring method (1), not only when a discharge of a certain magnitude or more (for example, discharge of 50 [A] or more) occurs but also when a predetermined change other than that occurs in the battery (ie, When it is recognized that there is a possibility that the internal resistance of the battery has changed by a certain amount or more), the internal resistance of the battery is calculated using this as a trigger. Therefore, since the opportunity for calculating the internal resistance of the battery can be increased, it is possible to maintain a state in which an error from the actual value is small.

  Hereinafter, embodiments of a battery state monitoring device, a battery state monitoring system, and a battery state monitoring method according to the present invention will be described with reference to the drawings. FIG. 1 is a block diagram schematically showing a main part of a battery state monitoring system employing a battery state monitoring apparatus according to the embodiment (1). In the figure, reference numeral 1 denotes a battery state monitoring device. The battery state monitoring device 1 includes a microcomputer 2 and a sensor acquisition unit 7 for acquiring signals from various sensors. The battery state monitoring device 1 is connected to a power supply line L for supplying power from the battery 8.

The microcomputer 2 includes an open circuit voltage calculation unit 3 that calculates the open circuit voltage V _OPN of the battery 8, an internal resistance calculation unit 4 that calculates the internal resistance R of the battery 8, and a charge rate calculation unit that calculates the charge rate SOC of the battery 8. 5 and a power generation command unit 6 that adjusts the output voltage of the alternator 9.

  The power line L is connected not only to the battery state monitoring device 1 but also to an alternator 9, an electric load 10 of a system to which power is always supplied, and electronic units 12 and 13 via a switch 11. When the current that can be taken out from the battery 8 (allowable discharge current) greatly decreases, the battery state monitoring device 1 opens the switch 11, stops the power supply to the electronic units 12, 13, and the electrical load 10 having high importance. A stable power supply is ensured.

  A voltage sensor 14 for detecting the battery voltage value, a current sensor 15 for detecting the battery current value, a voltage sensor 16 for detecting the output voltage of the alternator 9, and a temperature for detecting the battery liquid temperature The sensor 17 is connected to the sensor acquisition unit 7 so that the battery voltage value, the battery current value, the output voltage of the alternator 9 and the battery liquid temperature are recognized by the battery state monitoring device 1 (microcomputer 2). .

  A processing operation [1-1] for calculating the internal resistance R of the battery 8 performed by the microcomputer 2 in the battery state monitoring device 1 according to Embodiment (1) will be described based on the flowchart shown in FIG. This processing operation [1-1] is performed every predetermined time. First, the battery fluid temperature THB1 is detected based on the data obtained from the temperature sensor 17 (step S1), and the battery voltage value V1 is detected based on the data obtained from the voltage sensor 14 (step S2).

  A latch process is performed to change the battery current value I1 detected last time into a battery current value I2 to be a comparison value thereafter (step S3), and then the battery current value I1 is detected based on the data obtained from the current sensor 15. (Step S4), the current integrated value Isum1 is calculated by integrating the battery current value I1 (Step S5). As will be described later, the current integrated value Isum1 is cleared when the battery internal resistance R is updated (see step S13). Therefore, the current integrated value Isum1 is an integrated value from the previous battery internal resistance R update.

  Next, whether or not the value obtained by subtracting the battery current value I2 (previously detected battery current value) from the battery current value I1 (currently detected battery current value) is equal to or greater than a predetermined value Icon1 (for example, 50 [A]). Is determined (step S6). If it is determined that the value obtained by subtracting the battery current value I2 from the battery current value I1 is equal to or greater than the predetermined value Icon1 (that is, a large discharge has occurred), the voltage sensor 14 and the current sensor 15 are monitored, and the battery voltage value and the battery Data sampling of the current value is started (step S7).

  Next, it is determined whether or not a predetermined time (for example, 5 seconds) has elapsed since the start of data sampling (step S8), and if it is determined that the predetermined time has elapsed since the start of data sampling. The data sampling is finished (step S9). Thereafter, the battery internal resistance R is calculated using the battery voltage value and the battery current value obtained by data sampling, and the battery internal resistance R is updated (step S10).

The battery internal resistance R, as shown below, sampled battery voltage value _{V 1, V 2, ...,} V n, and the battery current value I _1, I _2, ..., can be determined from I _{n.
R1 = (V 2 -V 1)} / (I 2 -I 1)
_{R2 = (V 3 -V 2)} / (I 3 -I 2)
...
R _n-1 = (V _n −V _n−1 ) / (I _n −I _n−1 )
R = (R1 + R2 +... + R _n-1 ) / (n-1)

  After calculating the battery internal resistance R, based on the data obtained from the temperature sensor 17, the battery fluid temperature THB2 (battery fluid temperature to be a subsequent comparison value) is detected (step S11), and the data obtained from the voltage sensor 14 is detected. Based on this, a battery voltage value V2 (battery voltage value to be a subsequent comparison value) is detected (step S12), and the current integrated value Isum1 is set to 0 (step S13). That is, the battery liquid temperature and the battery voltage value when the battery internal resistance R is updated are detected.

  On the other hand, if it is determined in step S6 that the value obtained by subtracting the battery current value I2 from the battery current value I1 is not equal to or greater than the predetermined value Icon1 (that is, no large discharge has occurred), then the battery voltage value V1 (current detection) The battery voltage value) and the battery voltage value V2 (comparison value detected when the battery internal resistance R was last updated) is greater than or equal to a predetermined value Vcon (eg, 0.3 [V]). (Step S14).

  If it is determined that the difference between the battery voltage value V1 and the battery voltage value V2 is equal to or greater than the predetermined value Vcon (that is, after the battery internal resistance R is updated, the battery voltage value fluctuates more than a certain level), The value obtained by subtracting the battery current value I2 (battery current value detected last time) from the battery current value I1 (currently detected battery current value) is smaller than the predetermined value Icon2 (the predetermined value Icon2 is smaller than the predetermined value Icon1, for example, 30 [A ]) Or not is determined (step S15).

  If it is determined that the value obtained by subtracting the battery current value I2 from the battery current value I1 is equal to or greater than the predetermined value Icon2 (that is, discharge of a certain magnitude has occurred), the process proceeds to step S7, where the battery voltage value and the battery current Data sampling is performed, the battery internal resistance R is calculated, the battery internal resistance R is updated (step S10), the battery liquid temperature THB2 (the battery liquid temperature as the subsequent comparison value) and the battery voltage value V2 (the subsequent A battery voltage value as a comparison value) is detected (steps S11 and S12), and the current integrated value Isum1 is set to 0 (step S13). On the other hand, if it is determined in step S15 that the value obtained by subtracting the battery current value I2 from the battery current value I1 is not equal to or greater than the predetermined value Icon2, the processing operation [1-1] is terminated as it is.

  If it is determined in step S14 that the difference between the battery voltage value V1 and the battery voltage value V2 is not equal to or greater than the predetermined value Vcon, the magnitude of the current integrated value Isum1 is then set to a predetermined value Isum_con1 (for example, 1000 [Asec] ) Or not (that is, whether or not the battery charge / discharge of a certain magnitude or more has occurred after the battery internal resistance R is updated) (step S16).

  If it is determined that the magnitude of the current integrated value Isum1 is equal to or greater than the predetermined value Isum_con1 (that is, the battery charge / discharge exceeding a certain magnitude has occurred after the battery internal resistance R is updated), the process proceeds to step S15, and the battery current value It is determined whether or not a value obtained by subtracting battery current value I2 (battery current value detected last time) from I1 (currently detected battery current value) is equal to or greater than a predetermined value Icon2, and battery current value I2 is calculated from battery current value I1. If it is determined that the subtracted value is equal to or greater than the predetermined value Icon2, the process proceeds to step S7.

  On the other hand, if it is determined in step S16 that the current integrated value Isum1 is not greater than or equal to the predetermined value Isum_con1, then the battery fluid temperature THB1 (currently detected battery fluid temperature) and battery fluid temperature THB2 (previous battery internal resistance) It is determined whether the difference from the comparison value detected at the time of R update is equal to or greater than a predetermined value THBcon (for example, 10 [° C.]) (step S17).

  If it is determined that the difference between the battery fluid temperature THB1 and the battery fluid temperature THB2 is equal to or greater than a predetermined value THBcon (that is, after the battery internal resistance R has been updated, the battery fluid temperature has changed by a certain level or more) Based on the temperature THB1, the battery internal resistance R is corrected and the battery internal resistance R is updated (step S18). Thereafter, the battery liquid temperature THB2 (battery liquid temperature to be a subsequent comparison value) and the battery voltage value V2 (after that) Battery voltage value as a comparison value) is detected (steps S11 and S12), and the current integrated value Isum1 is set to 0 (step S13). On the other hand, if it is determined that the difference between the battery fluid temperature THB1 and the battery fluid temperature THB2 is not equal to or greater than the predetermined value THBcon, the processing operation [1-1] is terminated as it is.

  As shown in FIG. 3, since the battery internal resistance R has a temperature characteristic depending on the battery liquid temperature, it can be corrected using this temperature characteristic. If the battery fluid temperature rises, the battery internal resistance R decreases. Conversely, if the battery fluid temperature decreases, the battery internal resistance R increases.

  The processing operation [1-2] for calculating the open circuit voltage Vopn of the battery 8 performed by the microcomputer 2 in the battery state monitoring apparatus 1 according to the embodiment (1) will be described based on the flowchart shown in FIG. This processing operation [1-2] is performed every predetermined time.

  First, based on the data obtained from the current sensor 15, the battery current value I3 is detected (step S21), and the battery current value I3 is integrated to calculate the current integrated value Isum3 (step S22). As will be described later, the current integrated value Isum3 is cleared when the battery open voltage Vopn is updated (see step S26). Therefore, the current integrated value Isum3 is an integrated value from the previous battery open voltage Vopn update.

  Next, it is determined whether or not the magnitude of the battery current value I3 is equal to or less than a predetermined value Icon3 (for example, 1 [A]) (that is, whether or not the battery 8 can be said to be free of charge / discharge) ( Step S23). If it is determined that the magnitude of the battery current value I3 is equal to or less than the predetermined value Icon3, the battery voltage value V3 is detected based on the data obtained from the voltage sensor 14 (step S24), and the battery voltage value V3 is determined as the battery open voltage. Vopn is set to update the battery open voltage (step S25), and then the current integrated value Isum3 is set to 0 (step S26).

  The battery voltage value when the battery current stops flowing (that is, when the battery current value is 0 [A]) is the battery open voltage Vopn. Therefore, even if the battery voltage value when the battery current almost stops flowing (for example, when the battery current value is within the range of ± 1 [A]) is handled as the battery open voltage Vopn, there is no particular problem.

On the other hand, if it is determined in step S23 that the magnitude of the battery current value I3 is not less than the predetermined value Icon3, then whether or not the battery internal resistance R has been updated after the previous update of the battery open voltage Vopn is determined. Judgment is made (step S27). If it is determined that the battery internal resistance R has been updated, the battery voltage value V3 is detected based on the data obtained from the voltage sensor 14 (step S28), the battery voltage value V3, the battery current value I3, and the battery internal value Based on the resistance R, the battery open voltage Vopn is calculated, the battery open voltage Vopn is updated (step S29), and then the process proceeds to step S26 to set the current integrated value Isum3 to zero. The battery open voltage V _OPN can be obtained from the relational expression Vopn = V3−I3 · R.

  If it is determined in step S27 that the battery internal resistance R has not been updated, then whether or not the current integrated value Isum3 is greater than or equal to a predetermined value Isum_con3 (for example, 500 [Asec]). That is, it is determined whether or not a battery charge / discharge of a certain magnitude or more has occurred after the battery open voltage Vopn is updated (step S30).

  If it is determined that the current integrated value Isum3 is greater than or equal to a predetermined value Isum_con3 (that is, a battery charge / discharge of a certain level or more has occurred after the battery open voltage Vopn has been updated), the battery is determined based on the current integrated value Isum3. The open circuit voltage Vopn is corrected, the battery open circuit voltage Vopn is updated (step S31), and then the process proceeds to step S26 to set the current integrated value Isum3 to zero. On the other hand, if it is determined that the magnitude of the current integrated value Isum3 is not equal to or greater than the predetermined value Isum_con3, the processing operation [1-2] is terminated as it is.

  The correlation as shown in FIG. 5 is established between the current integrated value Isum3 and the battery open voltage Vopn. If the current integrated value Isum3 increases (when the battery 8 is charged), the battery open voltage Vopn increases, and conversely, if the current integrated value Isum3 decreases (when the battery 8 is discharged), the battery open voltage Vopn decreases. For example, when the amount of electricity of 1000 [Asec] is charged, it can be determined that the battery open voltage Vopn has increased by 2 [V]. Conversely, when the amount of electricity of 1000 [Asec] is discharged, the battery It can be determined that the open circuit voltage Vopn has decreased by 2 [V].

  Further, as shown in FIGS. 6 and 7, the battery open voltage Vopn has characteristics depending on the battery internal resistance R and the battery liquid temperature THB. Therefore, in another embodiment, the battery internal resistance R and the battery liquid temperature THB are used. The battery open voltage Vopn may be corrected based on the above. For example, the battery open-circuit voltage Vopn is multiplied by the correction coefficient k1.

  The battery internal resistance R is 5 [mΩ] as a reference value. When the internal resistance R is 5 [mΩ], the correction coefficient k1 is 1, and the correction is performed when the internal resistance R is larger than 5 [mΩ]. The coefficient k1 becomes smaller than 1, and conversely, when the internal resistance R becomes smaller than 5 [mΩ], the correction coefficient k1 becomes larger than 1.

  When the battery liquid temperature THB is 25 [° C.] and the battery liquid temperature THB is 25 [° C.], the correction coefficient k1 is 1 and the battery liquid temperature THB is greater than 25 [° C.]. The correction coefficient k1 becomes smaller than 1, and conversely, when the battery liquid temperature THB becomes smaller than 25 [° C.], the correction coefficient k1 becomes larger than 1.

  When both the battery internal resistance R and the battery liquid temperature THB are taken into account, the battery liquid temperature THB is corrected based on the relationship between the battery internal resistance R and the battery liquid temperature THB as shown in FIG. Then, the correction coefficient k1 may be determined using the corrected battery fluid temperature THB. For example, the battery fluid temperature THB is multiplied by the correction coefficient k2.

  The battery internal resistance R is 5 [mΩ] as a reference value. When the internal resistance R is 5 [mΩ], the correction coefficient k2 is 1, and the correction is performed when the internal resistance R is larger than 5 [mΩ]. The coefficient k2 becomes larger than 1, and conversely, if the internal resistance R becomes smaller than 5 [mΩ], the correction coefficient k2 becomes smaller than 1.

  The processing operation [1-3] for calculating the battery charge rate SOC performed by the microcomputer 2 in the battery state monitoring apparatus 1 according to Embodiment (1) will be described based on the flowchart shown in FIG. This processing operation [1-3] is an operation performed every predetermined time. First, it is determined whether or not the battery open-circuit voltage Vopn has been updated after the previous battery charge rate SOC update (step S41).

  If it is determined that the battery open voltage Vopn has been updated, the battery charge rate SOC is calculated based on the battery open voltage Vopn, and the battery charge rate SOC is updated (step S42). Since the correlation is established between the battery open voltage Vopn and the battery charge rate SOC as shown in FIG. 14, the battery charge rate SOC can be obtained from the battery open voltage Vopn.

  If it is determined in step S41 that the battery open voltage Vopn has not been updated, it is then determined whether or not the battery internal resistance R has been updated after the previous update of the battery charge rate SOC. (Step S43). If it is determined that the battery internal resistance R has been updated, the battery charge rate SOC is corrected based on the battery internal resistance R, and the battery charge rate SOC is updated (step S44). On the other hand, if it is determined that the battery internal resistance R has not been updated, the processing operation [1-3] is terminated.

  As shown in FIG. 10, since the battery charge rate SOC has characteristics due to the battery internal resistance R, for example, the battery charge rate SOC is corrected by multiplying the correction coefficient k3 obtained from the battery internal resistance R. The battery internal resistance R is 5 [mΩ] as a reference value. When the internal resistance R is 5 [mΩ], the correction coefficient k3 is 1, and the correction is performed when the internal resistance R is larger than 5 [mΩ]. The coefficient k3 becomes smaller than 1, and conversely, if the internal resistance R becomes smaller than 5 [mΩ], the correction coefficient k3 becomes larger than 1.

  The output voltage of the alternator 9 performed by the microcomputer 2 in the battery state monitoring device 1 that constitutes the battery monitoring system that employs the battery state calculation system according to the embodiment (1) is adjusted to create a state without battery charging / discharging. Processing operation [1-4] will be described based on the flowchart shown in FIG. This processing operation [1-4] is performed every predetermined time. First, the battery current value I4 is detected based on the data obtained from the current sensor 15 (step S51), and then whether or not a predetermined time (for example, 300 seconds) has elapsed since the previous update of the battery open voltage Vopn. Is determined (step S52).

  If it is determined that the predetermined time has passed since the last update of the battery open voltage Vopn (that is, the battery open voltage Vopn is at a timing when it should be newly updated), then the magnitude of the battery current value I4 is predetermined. It is determined whether or not the value is equal to or less than a value Icon4 (for example, 10 [A]) (step S53).

  If it is determined that the magnitude of the battery current value I4 is equal to or less than the predetermined value Icon4, then whether or not the battery current value I4 is equal to or greater than 0 [A] (that is, whether or not the battery 8 is in a charged state). ) Is determined (step S54). If it is determined that the battery current value I4 is equal to or greater than 0 [A] (is in a charged state), the alternator 9 is adjusted so that the output voltage slowly decreases (step S55), and the battery current value I4 is 0 [ A] If it is determined that the output voltage is not greater than that (in a discharging state), the alternator 9 is adjusted so that the output voltage rises slowly (step S56). That is, the alternator 9 is adjusted in a direction in which the output voltage of the alternator 9 and the battery voltage value are balanced so that the battery current does not flow.

  Next, based on the data obtained from the current sensor 15, the battery current value I5 is detected (step S57), and whether or not the magnitude of the battery current value I5 is equal to or less than a predetermined value Icon5 (for example, 1 [A]). Is determined (step S58). If it is determined that the magnitude of the battery current value I5 is equal to or less than the predetermined value Icon5 (that is, the battery current value has converged and the battery open voltage can be calculated from the battery voltage value), the processing operation [1- 4] is ended. Thereafter, when the processing operation [1-2] shown in FIG. 4 is executed, “Y” is determined in step S23, and the battery open voltage Vopn is calculated and updated. On the other hand, if it is determined that the magnitude of the battery current value I5 is not less than the predetermined value Icon5, the process returns to step S54.

  If it is determined in step S52 that the predetermined time has not elapsed since the previous update of the battery open voltage Vopn (that is, the battery open voltage Vopn has not yet arrived at a new update timing), The processing operation [1-4] is terminated. Further, when it is determined in step S53 that the battery current value I4 is not smaller than the predetermined value Icon4 (that is, it is not a preferable state for forcibly converging the battery current value around 0 [A]). Then, the processing operation [1-4] is finished as it is.

  According to the battery state monitoring apparatus according to the above embodiment (1), not only when a discharge of a certain magnitude or more (for example, discharge of 50 [A] or more) occurs, but also a battery voltage value of a certain magnitude or more. When there is a fluctuation of the battery or when the battery is charged / discharged more than a certain amount (that is, when it is recognized that the battery internal resistance R may have changed more than a certain amount), The battery internal resistance R is calculated as a trigger. Further, when the battery liquid temperature fluctuates beyond a certain level, the battery internal resistance R is corrected based on the battery liquid temperature. Accordingly, opportunities for calculating the battery internal resistance R are increased, and the battery internal resistance R is corrected at an appropriate timing, so that a state in which an error from the actual value is small can be maintained.

  As a result, the battery open-circuit voltage Vopn can also be maintained in a state where the error from the actual value is small, the calculation accuracy of the current (allowable discharge current) that can be taken out from the battery 8 is increased, and power supply to the electronic unit is achieved. It is possible to more appropriately limit the above. In addition, the calculation accuracy of the battery charge rate SOC is increased, and the charge control can be performed more appropriately.

  If the opportunity for calculating the battery internal resistance R increases, the processing burden on the microcomputer 2 and the like increases, but it is recognized that the battery internal resistance R may have changed to some extent (when a change occurs in the battery state) ) Is limited in the calculation timing, so that an increase in processing load on the microcomputer 2 and the like can be suppressed within a necessary range.

Also, the battery open voltage Vopn is calculated not only when the battery current converges around 0 [A] but also when the battery internal resistance R is updated, which is used as a trigger. Further, when the battery is charged / discharged over a certain level, the battery open voltage Vopn is corrected based on the integrated current value (charge / discharge amount of electricity). Thereby, also about the battery open voltage Vopn, the state with a small error with an actual value can be maintained more reliably.
Further, the battery charging rate SOC is calculated when the battery open voltage Vopn is updated, and is corrected when the battery internal resistance R is updated. Therefore, the battery charge rate SOC can be updated more appropriately.

  Next, a battery state monitoring system that employs the battery state monitoring device according to the embodiment (2) will be described. However, the battery state monitoring system employing the battery state monitoring device according to the embodiment (2) is the battery state shown in FIG. 1 except for the battery state monitoring device 1, the microcomputer 2, and the internal resistance calculation unit 4. Since the configuration is the same as that of the monitoring system, different symbols are assigned to the battery state monitoring device, the microcomputer, and the internal resistance calculation unit, and description of other components is omitted here.

  1A shows a battery state monitoring device, and the battery state monitoring device 1A includes a microcomputer 2A and a sensor acquisition unit 7 for acquiring signals from various sensors. In addition, a power supply line L for supplying power from the battery 8 is connected to the battery state monitoring device 1A.

The microcomputer 2A includes an open circuit voltage calculation unit 3 that calculates the open circuit voltage V _OPN of the battery 8, an internal resistance calculation unit 4A that calculates the internal resistance R of the battery 8, and a charge rate calculation unit that calculates the charge rate SOC of the battery 8. 5 and a power generation command unit 6 that adjusts the output voltage of the alternator 9.
Further, the microcomputer 2A performs the processing operation [1-2] shown in FIG. 4 and the processing operation [1-] performed by the microcomputer 2 in the battery state monitoring apparatus 1 according to the embodiment (1). 3], a processing operation similar to the processing operation [1-4] shown in FIG. 11 is performed.

  The processing operation [2-1] for calculating the internal resistance R of the battery 8 performed by the microcomputer 2A in the battery state monitoring apparatus 1A according to the embodiment (2) will be described based on the flowchart shown in FIG. This processing operation [2-1] is performed every predetermined time. However, the processing operations of steps S1 to S16 are the same as the processing operations of steps S1 to S16 shown in FIG.

  In step S17, the difference between the battery fluid temperature THB1 detected in step S1 (currently detected battery fluid temperature) and the battery fluid temperature THB2 detected in step S11 (previously detected comparison value) is a predetermined value THBcon (for example, 10). [° C.]) or not.

  If it is determined that the difference between the battery fluid temperature THB1 and the battery fluid temperature THB2 is equal to or greater than a predetermined value THBcon (that is, after the battery internal resistance R is updated, the battery fluid temperature has fluctuated more than a certain level), Then, it is determined whether or not the value obtained by subtracting the battery current value I2 (previously detected battery current value) from the battery current value I1 (currently detected battery current value) is equal to or greater than a predetermined value Icon2 (<predetermined value Icon1) ( Step S61).

  If it is determined that the value obtained by subtracting the battery current value I2 from the battery current value I1 is equal to or greater than the predetermined value Icon2 (that is, a certain amount of discharge has occurred), the process proceeds to step S62 and the battery internal resistance R is updated. “Update battery internal resistance R” processing (FIG. 13) is performed, and then the process proceeds to step S11.

  On the other hand, when it is determined in step S17 that the difference between the battery fluid temperature THB1 and the battery fluid temperature THB2 is not equal to or greater than the predetermined value THBcon, or in step S61, the value obtained by subtracting the battery current value I2 from the battery current value I1 is the predetermined value. If it is determined that it is not equal to or higher than Icon2, the processing operation [2-1] is terminated as it is.

  Next, the “updating battery internal resistance R” process will be described based on the flowchart shown in FIG. First, the voltage sensor 14 and the current sensor 15 are monitored, and data sampling of the battery voltage value and the battery current value is started (step S71). Next, a predetermined time (for example, 5 [seconds]) after the data sampling is started. It is determined whether or not it has elapsed (step S72).

  If it is determined that the predetermined time has elapsed since the start of the data sampling, the data sampling is terminated (step S73), and then the battery voltage value and the battery current value obtained by the data sampling are used to determine the battery internal resistance R. The battery internal resistance Ra used for the update is calculated (step S74).

The battery internal resistance Ra, as shown below, sampled battery voltage value _{V 1, V 2, ...,} V n, and the battery current value I _1, I _2, ..., can be determined from I _{n.
R1 = (V 2 -V 1)} / (I 2 -I 1)
_{R2 = (V 3 -V 2)} / (I 3 -I 2)
...
R _n-1 = (V _n −V _n−1 ) / (I _n −I _n−1 )
Ra = (R1 + R2 +... + R _n-1 ) / (n-1)

  Next, the battery internal resistance R is corrected based on the battery fluid temperature THB1, and the battery internal resistance Rb used for updating the battery internal resistance R is obtained (step S75). Thereafter, the battery internal resistance R is updated based on the battery internal resistance Ra obtained in step S74 and the battery internal resistance Rb obtained in step S75 (step S76).

As a method of updating the battery internal resistance R here, the following a and b are mentioned.
I. Of the battery internal resistance Ra and the battery internal resistance Rb, the larger one is updated as the battery internal resistance R.
B. The average value of the battery internal resistance Ra and the battery internal resistance Rb is updated as the battery internal resistance R.
It should be noted that, in both cases (b) and (b), if there is a large difference between the values of the battery internal resistance Ra and the battery internal resistance Rb, there is a problem in the credibility of the battery internal resistances Ra and Rb. The battery internal resistance R may not be updated.

It is the block diagram which showed roughly the principal part of the battery state monitoring system which employ | adopted the battery state monitoring apparatus which concerns on embodiment (1) of this invention. It is the flowchart which showed the processing operation which the microcomputer in the battery condition monitoring apparatus which concerns on embodiment (1) performs. It is the graph which showed the relationship between battery liquid temperature and battery internal resistance. It is the flowchart which showed the processing operation which the microcomputer in the battery condition monitoring apparatus which concerns on embodiment (1) performs. It is the graph which showed the relationship between an electric current integrated value and the correction value of a battery open voltage. It is the graph which showed the relationship between the battery internal resistance and the correction coefficient with respect to a battery open voltage. It is the graph which showed the relationship between the battery liquid temperature and the correction coefficient with respect to a battery open voltage. It is the graph which showed the relationship between the battery internal resistance and the correction coefficient with respect to battery liquid temperature. It is the flowchart which showed the processing operation which the microcomputer in the battery condition monitoring apparatus which concerns on embodiment (1) performs. It is the graph which showed the relationship between the battery internal resistance and the correction coefficient with respect to a battery charging rate. It is the flowchart which showed the processing operation which the microcomputer in the battery condition monitoring apparatus which concerns on embodiment (1) performs. It is the flowchart which showed the processing operation which the microcomputer in the battery condition monitoring apparatus which concerns on embodiment (2) performs. It is the flowchart which showed the processing operation which the microcomputer in the battery condition monitoring apparatus which concerns on embodiment (2) performs. It is the graph which showed the relationship between a battery open voltage and a battery charge rate.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 1A Battery state monitoring apparatus 2, 2A Microcomputer 3 Opening voltage calculation part 4, 4A Internal resistance calculation part 5 Charging rate calculation part 6 Power generation command part 7 Sensor acquisition part 8 Battery 9 Alternator 14, 16 Voltage sensor 15 Current sensor 17 Temperature Sensor

Claims (13)

In a battery state monitoring device for monitoring a battery state,
When it is determined that a discharge of a certain magnitude or more has occurred, or when it is determined that another predetermined change has occurred in the battery, each has a battery internal resistance calculation means for calculating the internal resistance of the battery using each as a trigger. A battery state monitoring device. When the battery liquid temperature has changed by a certain level or more from the previous battery internal resistance calculation by the battery internal resistance calculation means,
The battery state monitoring apparatus according to claim 1, wherein it is determined that the predetermined change has occurred in the battery. When the battery voltage value fluctuates more than a certain level from the previous battery internal resistance calculation by the battery internal resistance calculation means,
The battery state monitoring apparatus according to claim 1, wherein it is determined that the predetermined change has occurred in the battery. From the time of the previous battery internal resistance calculation by the battery internal resistance calculation means, when there is a battery discharge or charge of a certain size or more,
The battery state monitoring apparatus according to claim 1, wherein it is determined that the predetermined change has occurred in the battery. When it is determined that there has been a change in battery fluid temperature that is greater than or equal to the certain magnitude since the previous battery internal resistance calculation by the battery internal resistance calculation means, and that the predetermined change has occurred in the battery,
The battery internal resistance calculation means,
3. The battery state monitoring device according to claim 2, wherein the internal resistance of the battery is corrected in accordance with a change in battery liquid temperature. In a battery state monitoring device for monitoring a battery state,
Battery internal resistance update means for updating the internal resistance of the battery;
A battery state monitoring device, comprising: a battery open voltage calculation means for calculating a battery open voltage triggered by a case where the internal resistance of the battery is updated by the battery internal resistance update means. In a battery state monitoring device for monitoring a battery state,
Battery internal resistance update means for updating the internal resistance of the battery;
When it is determined that the battery charge / discharge has converged within a predetermined range, when the internal resistance of the battery is updated by the battery internal resistance update unit, the battery open voltage calculation unit calculates the open circuit voltage of the battery using each as a trigger And a battery state monitoring device. When it is determined that the battery charge / discharge has converged within the predetermined range,
The battery open voltage calculation means is
8. The battery state monitoring apparatus according to claim 7, wherein the battery voltage value when the battery charge / discharge converges within the predetermined range is used as the open circuit voltage of the battery. In a battery state monitoring device for monitoring a battery state,
Including at least one of battery open voltage update means for updating the open voltage of the battery and battery internal resistance update means for updating the internal resistance of the battery,
The battery charge rate is calculated using at least one of the case where the battery open voltage is updated by the battery open voltage update means and the case where the battery internal resistance is updated by the battery internal resistance update means as a trigger. A battery state monitoring device comprising battery charge rate calculation means. In a battery state monitoring device for monitoring a battery state,
Battery charge rate calculation means for calculating the charge rate of the battery based on the open voltage of the battery;
A battery state monitoring apparatus comprising: a battery charge rate correction unit that corrects the battery charge rate calculated by the battery charge rate calculation unit based on an internal resistance of the battery. In a battery state monitoring device for monitoring a battery state,
Battery open voltage update means for updating the open voltage of the battery when it is determined that the battery charge / discharge has converged within a predetermined range;
An alternator adjusting means for adjusting the output voltage of the alternator so that the battery charge / discharge converges within the predetermined range when a certain condition is satisfied;
The battery condition monitoring apparatus according to claim 1, wherein the certain condition includes that a predetermined time or more has elapsed since the last battery open voltage update by the battery open voltage update means. In a battery status monitoring system for monitoring battery status,
Battery status monitoring means for monitoring the battery status;
When it is determined by the monitoring of the battery state monitoring means that a discharge of a certain magnitude or more has occurred, and when it is determined that other predetermined changes have occurred in the battery, the internal resistance of the battery is calculated using each as a trigger. A battery state monitoring system comprising battery internal resistance calculation means. In a battery state monitoring method for monitoring a battery state,
A battery state monitoring method comprising a step of calculating an internal resistance of a battery when a discharge exceeding a certain magnitude occurs, or when a predetermined change other than that occurs in the battery, using each as a trigger .

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