JP2003209935A - Charge controller for secondary battery for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a charge controller for secondary battery for vehicle wherein the charging state of a secondary battery can be properly controlled. <P>SOLUTION: The charge controller comprises an alternating-current generator 10; a rectifier 20 which rectifies the output voltage of the alternating-current generator 10 and generates a rectified voltage; a regulator 30 which is controlled by a microcomputer 70 to control the rectified voltage from the rectifier 20 and outputs the voltage as a regulated voltage to a battery B and an electrical load L; and a current sensor 40 which detects currents flowing to the battery B. The microcomputer 70 causes the regulator 30 to control the regulated voltage so that the integrated value of a charged/discharged capacity obtained from the current detected by the current sensor 40 is zeroed. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle secondary battery charge control device for appropriately controlling the state of charge of a secondary battery mounted on a vehicle.

[0002]

2. Description of the Related Art A secondary battery mounted on a vehicle is usually charged by the output voltage of an AC generator and discharged to various loads equipped on the vehicle. The charging voltage at the time of charging and the discharging voltage at the time of discharging are controlled by the regulator, and this charging / discharging voltage is hereinafter referred to as an adjustment voltage.

In such charging control of the secondary battery, in order to efficiently charge the battery, the regulated voltage during charging is 13.5V which is higher than the rated voltage 12V of the battery.
It is generally set to about 14.5V.

[0004]

However, in the above-described conventional charge control, when the vehicle is running at a high speed and the battery load is low, the battery tends to be overcharged, which promotes the liquid leakage of the battery, and the burden on the internal combustion engine. There is a problem that fuel consumption is deteriorated due to increase in fuel consumption.

The present invention has been made in view of the above conventional problems, and an object thereof is to provide a charging control device for a secondary battery for a vehicle, which can appropriately control the charging state of the secondary battery. It is in.

[0006]

In order to achieve the above object, the present invention is a charge control device for a secondary battery for a vehicle, comprising an alternating current generator and a secondary battery charged by an output voltage of the alternating current generator. Used in a vehicle that includes a secondary battery, a regulator that controls the regulated voltage that is the charging / discharging voltage of the secondary battery, and a current detection unit that detects the current that flows in the secondary battery. It is characterized in that the adjustment voltage is controlled so that the integrated value of the charging / discharging capacity obtained from is zero.

According to the above construction, the regulator regulates the regulated voltage so that the integrated value of the charging / discharging capacity obtained from the current detected by the current detecting means becomes zero, so that overcharge of the secondary battery can be prevented. It is possible to suppress fuel consumption deterioration and battery liquid slippage.

Further, in the above charge control device, the adjustment voltage is controlled so that the integrated value of the charge / discharge capacity increases by a predetermined amount immediately after the vehicle is started.

With the above arrangement, the self-discharged battery capacity can be recovered in a state of being left unattended before the vehicle is started, and the vehicle can be restarted smoothly.

Further, in a charging control device for a secondary battery for a vehicle, an alternating current generator, a secondary battery charged by an output voltage of the alternating current generator, and an adjusting voltage which is a charging / discharging voltage of the secondary battery are provided. Used in a vehicle equipped with a regulator for controlling, a voltage detecting means for detecting a terminal voltage of a secondary battery, a current detecting means for detecting a current flowing through the secondary battery, and a temperature detecting means for detecting a temperature of the secondary battery. When the detected current is smaller than a predetermined supplementary charge completion determination current preset according to the voltage and temperature, the integrated value of the charge / discharge capacity is reset to zero, and the regulator detects the detected current by the current detecting means. It is characterized in that the adjustment voltage is controlled so that the integrated value of the charging / discharging capacity obtained from is zero.

According to the above structure, even when self-discharge occurs in a state where the vehicle is left unattended before starting, the remaining capacity of the battery can be secured at a predetermined value or more at the time of starting, overcharge of the secondary battery can be prevented, and fuel consumption can be reduced. It is possible to suppress deterioration of the battery and liquid leakage of the battery.

In addition, in a charging control device for a secondary battery for a vehicle, an alternating current generator, a secondary battery charged by an output voltage of the alternating current generator, and an adjustment voltage which is a charging / discharging voltage of the secondary battery are provided. Regulator for controlling, voltage detecting means for detecting the terminal voltage of the secondary battery, current detecting means for detecting the current flowing through the secondary battery, temperature detecting means for detecting the temperature of the secondary battery, and Used in a vehicle equipped with a polarization state estimation means for estimating the polarization state of the secondary battery from the charge / discharge history, and the polarization state estimation means selects only the voltage, current, and temperature data of the secondary battery that is less affected by the charge polarization. , The remaining capacity of the secondary battery is detected using this data, and if this remaining capacity exceeds a predetermined value, the regulator is set so that the integrated value of the charging / discharging capacity obtained from the current detected by the current detecting means becomes zero. To key To control the voltage, if not exceeding a predetermined value, characterized in that to control the adjustment voltage to allow charge shortage.

According to the above structure, even when the battery is in a polarized state due to repeated charging and discharging, the remaining capacity of the battery can be accurately detected and an appropriate adjustment voltage can be set according to the battery state. For this reason, overcharge of the secondary battery can be prevented, fuel consumption can be prevented from deteriorating, and liquid slippage of the battery can be suppressed.

Further, in the above charge control device, the polarization state estimating means detects the polarization state by paying attention to the voltage change based on the activation polarization among the voltage changes of the secondary battery caused by charging and discharging. And

According to the above configuration, it is possible to more accurately select the voltage / current data which is less affected by the charge polarization. As a result, overcharge of the secondary battery can be prevented, fuel consumption can be prevented from deteriorating, and battery slippage can be suppressed.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

Embodiment 1. FIG. 1 shows a configuration example of Embodiment 1 of a charging control device for controlling charging of a vehicle battery B according to the present invention. The battery B is composed of a lead storage battery, which is a type of secondary battery, or the like.

As shown in FIG. 1, the charging control device according to this embodiment includes an AC generator 10 (hereinafter referred to as a generator 10), a rectifier 20 and a regulator 30. The generator 10 is driven by the engine of the automobile to generate an AC voltage. The rectifier 20 rectifies the AC voltage of the generator 10 to generate a rectified voltage and supplies the rectified voltage to the battery B and the regulator 30. The regulator 30 is controlled by the microcomputer 70 described later to control the rectified voltage of the rectifier 20, and uses the battery B as an adjusted voltage.
And to the electric load L.

Further, the charging control device is provided with a current sensor 40 as a current detecting means and a microcomputer 7.
It has 0. The current sensor 40 detects a charging current or a discharging current of the battery B.

The microcomputer 70 executes the control program according to the flowchart shown in FIG. The microcomputer 70 calculates the charging / discharging balance of the battery B based on the detection value of the current sensor 40 during the execution of the control program, processes required for controlling the regulator 30, and data storage processes. It should be noted that the microcomputer 70 is always powered by the battery B and is in an operating state, and starts execution of the control program when the ignition switch IG of the vehicle is turned on. The control program is stored in the ROM of the microcomputer 70.
Stored in advance.

Next, the operation of the control program will be described with reference to FIG. As described above, when the execution of the control program is started, in step 100, the battery B
The value of the variable Isum for storing the integrated value of the charging / discharging capacity obtained from the current flowing in is reset to zero.

Next, the processing of steps 110 to 150 is carried out every cycle Δt (sec). In step 110, the detection current I of the current sensor 40 is read.
Then, in step 120, the integrated value Isu of the charge / discharge capacity is
m is calculated based on the following equation (1) according to the detected current I (positive is charged) and the current integrated value Isum ′ one cycle before.

## EQU1 ## Isum = Isum '+ I × Δt (1) where Isum is a unit of current × time, that is, a unit of charge / discharge capacity.

Further, in step 130, the correction amount ΔVm of the adjustment voltage is calculated based on the integrated value Isum of the charge / discharge capacity obtained in step 120, for example, using the map shown in FIG.

In step 140, the adjustment voltage Vm is calculated according to the following equation (2) according to the adjustment voltage Vm ′ one cycle before and the adjustment voltage correction amount ΔVm.

[Equation 2] Vm = Vm '+ [Delta] Vm (2)

Based on Vm calculated as described above, the microcomputer 70 controls the regulator 30 so that the regulated voltage becomes Vm.

Here, as described above, the adjustment voltage correction amount ΔVm is calculated using the map shown in FIG. 3, but this map shows that the integrated value Isum of the charge / discharge capacity is large. When ΔVm is small and Isum is small, ΔVm is large. Therefore, as the value of Isum increases, the adjustment voltage Vm decreases and the amount of charge in the battery B decreases. Conversely, Isum
As the value of becomes smaller, Vm becomes higher and the amount of charge in the battery B increases. As a result, in combination with the discharge from the battery B to the load L, the integrated value Isum of the charge / discharge capacity obtained from the current detected by the current sensor 40, that is, the integrated value of the charge / discharge amount to the battery B becomes zero. Adjust voltage V
m will be controlled.

With the above-mentioned structure, it is possible to prevent the battery B from being overcharged, and to suppress the liquid slippage of the battery B. In addition, since the power used for power generation can be saved, it is possible to prevent deterioration of fuel efficiency of the engine.

When Vm calculated as described above is equal to or higher than a preset upper limit value, it is corrected to an upper limit value, and when Vm is equal to or lower than a preset lower limit value, it is corrected to a lower limit value.

Immediately after the vehicle starts, the battery capacity may decrease due to self-discharge of the battery B. Immediately after the vehicle starts, the adjustment voltage Vm is set to the upper limit value until the value of Isum increases by a predetermined amount. It may be set and supplementary charging may be performed. In this case, after completion of supplementary charging, the Is
um is reset to zero, and control is started from step 120 in FIG.

Embodiment 2. FIG. 4 shows a configuration example of the second embodiment of the charging control device for controlling the charging of the automobile battery B according to the present invention. In the second embodiment, in addition to FIG. 1 showing the configuration of the first embodiment, a voltage sensor 50 as a voltage detecting means and a temperature sensor 60 as a temperature detecting means are provided. The voltage sensor 50 detects the terminal voltage of the battery B. The temperature sensor 60 detects the liquid temperature of the battery B and the case temperature of the side surface or the bottom surface.

The characteristic feature of the second embodiment is that the battery B is supplementally charged immediately after the vehicle is started, and the microcomputer 70 executes the supplementary charge completion determination described later. When this supplementary charge completion determination is executed, steps 210 to 230 of the flowchart of FIG. 5 are executed instead of steps 110 to 140 of the flowchart of FIG. The adjustment voltage Vm during this period
In order to smoothly complete the supplementary charge, is set to be slightly higher than usual in accordance with the battery temperature T, as shown in FIG. 6, for example. After the completion of the supplementary charge, control is executed so that the integrated value Isum of the charge / discharge capacity becomes zero. Other configurations are similar to those of the first embodiment.

Next, the control program added to the first embodiment will be described with reference to FIG. Step 21
At 0, the detected current I of the current sensor 40 and the voltage sensor 50
The detection voltage V and the detection temperature T of the temperature sensor 60 are read. Then, in step 220, the data of the voltage V and the temperature T read in step 210 are input to the auxiliary charge completion determination current map shown in FIG. 7 for the preset voltage and temperature, and the auxiliary charge completion determination is performed. The current Ih is calculated. Here, the determination current Ih may be obtained by linearly interpolating the map shown in FIG.

Next, the detected current I is the judgment current Ih.
If it is smaller than the above, the process proceeds to the subsequent step 230, resets the integrated value Isum of the charge / discharge capacity to zero, and shifts to the operation of the first embodiment shown in FIG.

With the above-described structure, the remaining capacity of the battery can be secured at a predetermined value or more at the time of starting even if self-discharge occurs in a state of being left unattended before starting the vehicle. In addition, it is possible to prevent the battery B from being overcharged, and it is also possible to prevent the liquid B from slipping. Furthermore, since the power used for power generation can be saved, it is possible to prevent deterioration of fuel efficiency of the engine.

Embodiment 3. FIG. 8 shows an operation flow of the third embodiment of the charging control device for controlling the charging of the automobile battery B according to the present invention. In the third embodiment,
The flowchart shown in FIG. 8 is the same as that shown in FIG.
It is adopted in place of the flow chart of. Therefore, in the third embodiment, the microcomputer 70 described in the second embodiment executes the charging control of the battery B according to the flowchart of FIG. 8 instead of the flowchart of FIG. 2 or 5. Other configurations are the same as those in the second embodiment.

In the third embodiment configured as described above, the execution of the control program is started by turning on the ignition switch IG of the vehicle.

Next, the operation of the control program will be described with reference to FIG. As described above, when the execution of the control program is started, in step 300, the charge state of the battery B stored in step 420 before the ignition switch IG is turned on and stored at the time of turning off the previous ignition switch IG is displayed. The remaining capacity SOC is read from the RAM of the microcomputer 70 as SOCO last time. In addition, a variable Isum for cumulatively storing the current flowing in the battery B and a value of a polarization index P representing a polarization state of the battery described later are reset to zero.
Here, the remaining capacity SOC is the actual capacity ratio of the battery B expressed in%.

Next, the processing of steps 310 to 410 is carried out every cycle Δt (sec). In step 310, the current I detected by the current sensor 40 and the voltage sensor 50 are detected.
The detection voltage V and the detection temperature T of the temperature sensor 60 are read. In step 320, the integrated value Isu of the charge / discharge capacity is
m is calculated based on the above equation (1) according to the detected current I (positive is charged). In the following step 330, the state of charge SOC is calculated according to the following equation (3) according to the integrated value Isum of the charge / discharge capacity and the previous value SOCo.

[Equation 3] SOC = SOCo + (Isum × 100 / C)
(3) However, in this formula (3), C represents the rated capacity (A · sec) of the battery B.

Further, in step 340, the index P representing the polarization state of the battery B is determined according to the detected current I, that is, the battery B, based on, for example, the following equation (4).
It is calculated from the charge / discharge history of.

[Equation 4]

However, in the equation (4), γ is the battery B
A correction term for the fluctuation of the charging efficiency (it becomes a value of 0 to 1 when the battery B is charged, but is 1 when the charging and discharging are repeated.
It becomes). t is time (sec). Also, I
d is a correction term caused by the activation polarization in the battery B. When Po is the value of the index P immediately before t1 and a and b are time constants, Id = a × Po when Po> 0 and Id = 0 when Po = 0.
And when Po <0, then Id = b × Po. The reason why the time constants a and b are used properly is that the influence time of activation polarization after discharge is different from that after charge. The equation (4) is stored in advance in the ROM of the microcomputer 70 and constitutes the polarization state estimating means according to the present invention.

FIG. 9 shows the voltage change and the absolute value | ΔV | of the change speed when charging and discharging are stopped at SOC 50%. In the present invention, the time until the voltage change rate │ΔV│, which can be estimated to be strongly influenced by the activation polarization having a high reaction rate, e.g., │ΔV│ = 1 mV / sec.
The reciprocal of time was adopted as the time constants a and b. That is, a = 1
/ 100 and b = 1/40. This means that the elimination speed of the influence of charge polarization is 100/40 times longer than that of discharge polarization.

In step 350, the correction amount ΔVm of the adjustment voltage Vm is calculated according to the integrated value Isum of the charging / discharging capacity obtained in step 320, for example, according to the map shown in FIG.

In step 360, the adjustment voltage Vm is calculated according to the adjustment voltage correction amount ΔVm based on the above-mentioned equation (2). As described in the first embodiment,
When the calculated Vm is equal to or higher than the preset upper limit value, it is corrected to the upper limit value, and when it is equal to or lower than the preset lower limit value, it is corrected to the lower limit value.

In step 370, it is determined whether or not the index P is larger than, for example, 300 (A · sec).
If the determination is affirmative, it is considered that the discharge history before the current time point is the charging tendency, and the detection voltage V and the detection current I are largely influenced by the charge polarization, so that the SOC is not corrected in step 410. Proceed to.

When the determination is negative, that is, when the influence of the charge polarization is considered to be small, the routine proceeds to step 380, where the data of the detection voltage V, the current I and the temperature T is stored in advance for each temperature SOC. The remaining capacity SOCm of the battery B is obtained by inputting the relationship between the voltage and the current. When the value of SOCm is different from the value of SOC calculated in the previous step 330, in consideration of detection accuracy, for example, when the difference is ± 2% or more, the SOC is calibrated based on the following equation (5). .

[Equation 5] SOC = (SOC + SOCm) / 2 (5)

Further, in order to prepare for the next processing, the above SO
Replace Co with SOC and reset the value of Isum to zero.

At step 390, the SOC is changed to SO
It is determined whether or not the target value of the C maintenance control is larger than 95%, for example. When the SOC is smaller than 95%, in the subsequent step 400, the value of the integrated value Isum of the charge / discharge capacity that was previously reset to zero is determined based on the following equation (6).

[Equation 6] Isum = (SOC-95) / 100 × C (6)

By this processing, since Isum always has a negative value, the adjustment voltage Vm is set to return Isum to zero in step 350 or step 360. That is, the adjustment voltage Vm is determined so that the shortage is charged and the SOC increases to the maintenance target value. Where SO
The battery B tends to be charged until C reaches the maintenance target value. Therefore, normally, the index P of the above step 370 is P>
The processing of step 380 to step 400 is not performed.

In step 390, the SOC is 9
If it is 5% or more, the integrated value Isum of the charge / discharge capacity remains zero, and the adjustment voltage Vm is set in step 350 or step 360 so as to maintain the current SOC. In this case, as described in the first embodiment, the adjustment voltage Vm is controlled so that the value of the integrated value Isum of the charge / discharge capacity, that is, the integrated value of the charge / discharge amount of the battery B becomes zero. .

In step 410, it is determined whether or not the ignition switch IG is turned off. If the determination is affirmative, the remaining capacity SOC at the present stage is stored and saved in the RAM of the microcomputer 70 in step 420. On the other hand, if the determination is negative, step 31
The processing after 0 is repeated.

As described above, in the third embodiment,
Only when it is determined that the influence of the charge polarization is small, the SOCm (step 380) obtained from the map in which the state of charge SOC (step 330) calculated by current integration is stored in advance.
Is calibrated in. As a result, only the voltage, current, and temperature data of the battery B when the influence of charge polarization is small are selected, and the remaining capacity of the battery B is detected using this data. As a result, the state of charge of the battery B can be managed with higher accuracy.

It should be noted that, after step 390, a judgment is made as to whether or not the SOC is higher than, for example, 98% with respect to the target value, and if the judgment is affirmative, the charge / discharge capacity is calculated based on the above equation (6). It is also possible to control the charging by determining the integrated value Isum of. In this case, further improvement in fuel economy can be expected.

Further, in the second embodiment, the processes of steps 370 to 400 may be executed during the maintenance control after the completion of the auxiliary charging.

[0054]

As described above, according to the present invention,
Since the regulator controls the adjustment voltage so that the integrated value of the charging / discharging capacity obtained from the current detected by the current sensor becomes zero, overcharging of the battery can be prevented, fuel consumption can be reduced, and battery slippage can be suppressed.

Further, it is possible to recover the self-discharged battery capacity when the vehicle is left unattended before starting, and to restart the vehicle smoothly.

Further, even when self-discharge occurs in a state of being left unattended before the vehicle is started, the remaining capacity of the battery can be secured at a predetermined value or more at the time of starting, and the secondary battery can be prevented from being overcharged. It is possible to suppress the liquid slippage.

Further, even when the battery is in a polarized state due to repeated charging and discharging, the remaining capacity of the battery can be accurately detected, and an appropriate adjustment voltage can be set according to the battery state. For this reason, overcharge of the secondary battery can be prevented, fuel consumption can be prevented from deteriorating, and liquid slippage of the battery can be suppressed.

Further, it is possible to more accurately select voltage and current data which is less affected by charge polarization. As a result, overcharge of the secondary battery can be prevented, fuel consumption can be prevented from deteriorating, and battery slippage can be suppressed.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration example of a first embodiment of a vehicle secondary battery charge control device according to the present invention.

FIG. 2 is a diagram showing an operation flow of the first embodiment shown in FIG.

FIG. 3 is a diagram showing an example of a map for obtaining a correction amount ΔVm of an adjustment voltage in the operation flow shown in FIG.

FIG. 4 is a diagram showing a configuration example of a second embodiment of a vehicle secondary battery charge control device according to the present invention. .

5 is a diagram showing an operation flow of the second embodiment shown in FIG. .

FIG. 6 is a diagram for obtaining an adjustment voltage Vm in the operation flow shown in FIG.

7 is a diagram showing an example of a map for obtaining a supplemental charge completion determination current in the operation flow shown in FIG.

FIG. 8 is a diagram showing an operation flow of the third embodiment of the vehicle secondary battery charge control device according to the present invention.

FIG. 9 is a diagram showing absolute values of voltage change and voltage change rate when charging and discharging are stopped at SOC 50%.

[Explanation of symbols]

10 AC generator, 20 rectifier, 30 regulator, 40 current sensor, 50 voltage sensor, 60 temperature sensor, 70 microcomputer, B battery,
L load.

Continued front page    (72) Inventor Shoji Sakai             14 Iwatani Shimohakaku-cho, Nishio-shi, Aichi Stock Association             Company Japan Auto Parts Research Institute (72) Inventor Masahiro Tanizawa             1 Toyota Town, Toyota City, Aichi Prefecture Toyota Auto             Car Co., Ltd. (72) Inventor Naohiko Suzuki             1 Toyota Town, Toyota City, Aichi Prefecture Toyota Auto             Car Co., Ltd. (72) Inventor Takeshi Sada             1-1, Showa-cho, Kariya city, Aichi stock market             Inside the company DENSO F term (reference) 2G016 CA03 CB01 CB12 CB21 CB22                       CB31 CB32 CC01 CC02 CC03                       CC04 CC07 CC12 CC13 CC14                       CC17 CC23 CC27 CC28 CD02                       CD03 CF06 CF07                 5G060 AA05 DB07                 5H030 AA03 AS08 FF22 FF42 FF43                       FF44                 5H590 AA02 AB04 CA07 CA23 CC02                       CD01 CE05 EA01 EB02 EB14                       FA08 GA06 GB05 HA01 HA02                       HA04 HA18 JA02 JB02

Claims (5)

[Claims] 1. An alternating current generator, a secondary battery charged by an output voltage of the alternating current generator, a regulator for controlling a regulated voltage which is a charging / discharging voltage of the secondary battery, and a secondary battery flowing through the secondary battery. It is used in a vehicle provided with a current detection means for detecting a current, and causes the regulator to control the adjustment voltage so that an integrated value of charge / discharge capacity obtained from a current detected by the current detection means becomes zero. A charging control device for a secondary battery for a vehicle. 2. The charging control device according to claim 1, wherein
Immediately after the vehicle is started, the adjustment voltage is controlled so that the integrated value of the charge / discharge capacity is increased by a predetermined amount. 3. An AC generator, a secondary battery charged by the output voltage of the AC generator, a regulator for controlling a regulated voltage which is a charging / discharging voltage of the secondary battery, and a terminal of the secondary battery. Used in a vehicle that includes a voltage detection unit that detects a voltage, a current detection unit that detects a current flowing through the secondary battery, and a temperature detection unit that detects a temperature of the secondary battery, and the detection current is a voltage. If the current is smaller than a predetermined supplementary charge completion determination current preset according to the temperature and the temperature, the integrated value of the charge / discharge capacity is reset to zero, and the regulator is charged from the current detected by the current detecting means. A charging control device for a secondary battery for a vehicle, wherein the adjustment voltage is controlled so that an integrated value of discharge capacity becomes zero. 4. An AC generator, a secondary battery charged by the output voltage of the AC generator, a regulator for controlling a regulated voltage which is a charging / discharging voltage of the secondary battery, and a terminal of the secondary battery. Voltage detection means for detecting a voltage, current detection means for detecting a current flowing through the secondary battery, temperature detection means for detecting a temperature of the secondary battery, and the secondary battery from a charge / discharge history of the secondary battery. Used in a vehicle equipped with a polarization state estimation means for estimating the polarization state of a battery, the polarization state estimation means selects only the voltage, current, and temperature data of the secondary battery having a small influence of charge polarization, and this data is The remaining capacity of the secondary battery is detected by using the remaining capacity, and when the remaining capacity exceeds a predetermined value, the regulator is set so that the integrated value of the charging / discharging capacity obtained from the current detected by the current detecting means becomes zero. 2. The charging control device for a secondary battery for a vehicle, which controls the adjustment voltage, and controls the adjustment voltage so that the shortage can be charged when a predetermined value is not exceeded. 5. The charging control device according to claim 4,
The charging of a secondary battery for a vehicle, wherein the polarization state estimating means detects a polarization state by paying attention to a voltage change based on activation polarization among voltage changes of the secondary battery caused by charging and discharging. Control device.