JPH07107673A - Setting device for dischargeable capacity value - Google Patents

Abstract

PURPOSE:To set the estimated value of an accurate dischargeable capacity even if the charging, which is not performed to full charging, is repeated. CONSTITUTION:A charging current value I is multiplied by charging efficiency (e) and a cycle time DELTAt. The result is added to a chargeable capacity Cn, and a new chargeable capacity Cn is set (S130). When a charging voltage V becomes larger than a gas generating voltage V (T) based on a temperature T of a battery, the chargeable capacity Cn (T) at the time of gas generation based on the temperature T is set as the new chargeable capacity Cn. (S170). Thereafter, the chargeable capacity Cn is operated and set with the chargeable capacity Cn (T) at the time of gas generation as the reference. When the charging voltage becomes larger the specified voltage Vset, the value of 100 (%) is set for the dischargeable capacity Cn (S230), and the charging is finished. As a result, even if the charging, which is not performed to the full charging, is repeated, the estimated value of the chargeable capacity Cn can be set highly accurately by performing the charging up to the time of gas generation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dischargeable capacity value setting device, and more particularly, when charging a chargeable / dischargeable storage battery, the dischargeable capacity value for setting the dischargeable capacity value stored in the storage battery by charging. Regarding the value setting device.

[0002]

2. Description of the Related Art Conventionally, as a device for estimating the dischargeable capacity of a storage battery, there has been proposed a device for estimating the dischargeable capacity by integrating the charging current of the storage battery and correcting the integrated value or the like. JP 63-208773 A and JP 6
0-19980). In these devices, the dischargeable capacity is set to a predetermined value (for example, 100%) stored in advance when fully charged. At the time of discharging, the discharged current is integrated to obtain the discharged capacity, the discharged capacity is subtracted from the dischargeable capacity, and the remaining dischargeable capacity is estimated by performing correction based on the discharge current value, the temperature of the storage battery, and the like. On the other hand, when charging, the charging current is integrated and the charged capacity is calculated by correcting the charging efficiency based on the dischargeable capacity stored in the storage battery and the temperature of the storage battery, etc., and the remaining capacity can be discharged. In addition to the capacity, estimate the dischargeable capacity after charging. Then, when the battery is fully charged, the dischargeable capacity is set to the predetermined value (100%) again regardless of the estimated capacity.

[0003]

However, in these dischargeable capacity value setting devices, if charging is repeated without performing full charge, an error occurs between the estimated value and the actual value of the dischargeable capacity estimated by calculation. There is a problem in that there is a non-negligible gap between the estimated value of the dischargeable capacity estimated by calculation and the actual value.

In order to correct this error, Japanese Patent Laid-Open No. 63-2
The apparatus disclosed in 08787 proposes a method of periodically measuring the specific gravity of the electrolytic solution of the storage battery, estimating the dischargeable capacity from the relationship between the specific gravity of the electrolytic solution and the dischargeable capacity, and performing correction. However, this method cannot be used for a storage battery in which there is no correlation between the dischargeable capacity and the specific gravity of the electrolytic solution, and is difficult to use for a sealed storage battery.

The dischargeable capacity value setting device for the dischargeable capacity of a storage battery according to the present invention solves such a problem and aims to set an accurate estimated value of the dischargeable capacity even if charging is repeated until the battery is not fully charged. And adopted the following configuration.

[0006]

DISCLOSURE OF THE INVENTION A dischargeable capacity value setting device of the present invention is a dischargeable capacity value for setting a dischargeable capacity value stored in a storage battery by charging when charging a chargeable / dischargeable storage battery. A setting device, a state detecting means for detecting a predetermined state related to a state in which the storage battery generates gas accompanying charging, and when the predetermined state is detected,
The gist is that an estimated value setting means for setting a predetermined value as an estimated value of the dischargeable capacity is provided.

Here, in the dischargeable capacity value setting device, there is provided voltage detecting means for detecting a charging voltage of the storage battery, and the state detecting means determines the predetermined state by the charging voltage detected by the voltage detecting means. It is also possible to adopt a configuration that is a means for detecting that the voltage is equal to or higher than a predetermined voltage.

Further, in the dischargeable capacity value setting device, there are provided a temperature detecting means for detecting the temperature of the storage battery and a relationship storage means for storing in advance the relationship between the temperature of the storage battery and the dischargeable capacity in the predetermined state. The estimated value setting means obtains the predetermined value by referring to the relationship stored in the relationship storage means based on the temperature detected by the temperature detecting means, and sets the predetermined value as an estimated value of the dischargeable capacity. It is also possible to have a configuration in which

Further, in the dischargeable capacity value setting device, a pre-charge capacity estimating means for estimating a dischargeable capacity of the storage battery before charging, a current detecting means for detecting a charging current of the storage battery, and the state detecting means. Before the predetermined state is detected by, the dischargeable capacity is calculated based on the dischargeable capacity estimated by the pre-charge capacity estimating means and the charging current detected by the current detecting means, and the predetermined state is detected by the state detecting means. After detecting the state, a dischargeable capacity calculating means for calculating the dischargeable capacity based on the charging current detected by the current detecting means is provided with the predetermined value set by the capacity estimated value setting means as a reference. It can also be configured.

In addition, in the dischargeable capacity value setting device, a full charge detecting means for detecting a full charge of the storage battery, and when the full charge is detected, a predetermined full charge capacity is set as a dischargeable capacity. A configuration including a full charge capacity setting means may be adopted.

[0011]

In the dischargeable capacity value setting device according to claim 1 of the present invention configured as described above, the state detecting means detects the predetermined state related to the state in which the storage battery generates the gas that accompanies the charging. At this time, the estimated value setting means sets a predetermined value as an estimated value of the dischargeable capacity.

In the dischargeable capacity value setting device according to the second aspect, the state detecting means detects the predetermined state as a state in which the charging voltage of the storage battery detected by the voltage detecting means is equal to or higher than the predetermined voltage.

In the dischargeable capacity value setting device according to a third aspect of the present invention, the temperature detecting means detects the temperature of the storage battery, and the relationship storage means stores in advance the relationship between the temperature of the storage battery and the dischargeable capacity in a predetermined state. To do. The estimated value setting means obtains the predetermined value with reference to the relationship stored in the relationship storage means based on the temperature detected by the temperature detecting means, and sets the predetermined value as the estimated value of the dischargeable capacity.

In the dischargeable capacity value setting device according to the fourth aspect, the pre-charge capacity estimating means estimates the dischargeable capacity of the storage battery before charging, and the current detecting means detects the charging current of the storage battery. The dischargeable capacity calculation means calculates the dischargeable capacity based on the dischargeable capacity estimated by the pre-charge capacity estimation means and the charging current detected by the current detection means before the predetermined state is detected by the state detection means. Then, after the predetermined state is detected by the state detecting means, the dischargeable capacity is calculated based on the charging current detected by the current detecting means with the predetermined value set by the capacity estimation value setting means as a reference.

In the dischargeable capacity value setting device according to a fifth aspect, when the full charge detecting means detects the full charge of the storage battery,
The full charge capacity setting means sets a predetermined full charge capacity as a dischargeable capacity.

[0016]

Preferred embodiments of the present invention will be described below in order to further clarify the structure and operation of the present invention described above. FIG. 1 is a block diagram showing an outline of a charging system centering on a control device 20 including a dischargeable capacity value setting device which is an embodiment of the present invention.

This charging system includes a rechargeable battery 10 mounted on a vehicle, a control device 20 for calculating a dischargeable capacity of the battery 10 mounted on the vehicle,
A display device 24 installed in the instrument panel in front of the driver's seat of the vehicle and displaying the dischargeable capacity calculated by the control device 20.
And a charger 30 not mounted on the vehicle. The connection between the device installed in the vehicle and the charger 30 is
Connecting terminals 18 and 22 and a charger 30 provided on the vehicle
By connecting the connection terminals 34 and 36 prepared in 1.

The battery 10 has an anode 12 and a cathode 13 as electrodes. The electrodes 12 and 13 are connected via an output terminal 19 or a connection terminal 18 to a device such as a vehicle driving motor that operates by receiving power from the battery 10 and a charger 30. Between the electrodes 12, 13 and the output terminal 19 and the connection terminal 18, a voltmeter 16 for measuring the voltage between the electrodes, and a battery 10 taken out,
Alternatively, an ammeter 17 for measuring the current to be charged is installed. Further, the battery 10 is provided with a thermometer 14 that measures the temperature of the battery 10. Note that these measuring instruments are connected to the control device 20.

The control device 20 is configured as a logic circuit centering on a microcomputer, and more specifically, the CPU 20a and the CPU 20a which execute the calculation of the dischargeable capacity of the battery 10 according to a preset control program.
ROM 20b in which control programs and control data necessary to execute various arithmetic processes are stored in advance
The RAM 20c and the thermometer 1 in which various data necessary for executing various arithmetic processes in the PU 20a are temporarily read and written.
4, an input processing circuit 20d for inputting detection signals from the voltmeter 16 and the ammeter 17, and outputs a drive signal to the display device 24 in accordance with the calculation result in the CPU 20a and controls the charger 30 via the connection terminal 22. An output processing circuit 20e that outputs a signal is provided.

The charger 30 includes a rectifier circuit 30a for rectifying commercial alternating current, a constant current circuit 30b for supplying a constant current having a value instructed by a control signal from the controller 20, and a controller 2
It is provided with a connection switch 30c which receives a predetermined drive signal from 0 and controls the connection between the constant current circuit 30b and the battery 10. Further, the charger 30 includes a connection terminal 32 that receives power from a commercial AC power source, a connection terminal 34 that connects to the connection terminal 18 provided in the battery 10, and a control device 20.
Connection terminal 36 for receiving a control signal from

The charging system thus constructed operates as follows. Connection terminals 18 and 34 and connection terminal 22
When charging is started by connecting and 36, the CPU 20a
First, a charge start routine (not shown) stored in advance in the ROM 20b is executed, and a control signal for setting the charging current value I to the initial current value I1 is output to the constant current circuit 30b of the charger 30 via the output processing circuit 20e. At the same time, a control signal for enabling the connection between the charger 30 and the battery 10 is output to the connection switch 30c. In this routine, C
The PU 20a sets the initial value of each control flag. The charger 30 causes the charging current value I (value I
Charging of the battery 10 is started with the constant current of 1).

When the charging is started, the CPU 20a executes the dischargeable capacity estimation routine illustrated in FIG. 2 every predetermined time, for example, every 10 seconds. This routine is ROM2
It is previously described in 0b. When this routine is executed, first, the CPU 20a executes a process of reading the dischargeable capacity Cn described in a predetermined address of the RAM 20c (step S100). At a predetermined address of the RAM 20c, a dischargeable capacity Cn estimated by a calculation described later each time this routine is executed is stored.
At the start of discharge, the dischargeable capacity Cn estimated based on the discharge current and the like is described by a dischargeable capacity estimation routine (not shown) executed by the CPU 20a during discharge. Therefore, the dischargeable capacity Cn finally estimated by the dischargeable capacity estimation routine is described at a predetermined address of the RAM 20c at the start of charging.

Then, the charging efficiency e is determined based on the read dischargeable capacity Cn (step S110). A graph showing the relationship between the dischargeable capacity Cn and the charging efficiency e is described in the ROM 20b in advance. Dischargeable capacity Cn
FIG. 3 shows an example of a graph showing the relationship between the charging efficiency e and the charging efficiency e. The relationship between the dischargeable capacity Cn and the charging efficiency e is determined by the type of the battery 10, the charging current value I, the charging voltage V, and the like. Next, the latter term charge determination flag F1
Is a value 0 (step S120). The latter term charging determination flag F1 is a flag for determining whether or not charging can be efficiently performed at the charging current value I (value I1). The late charging determination flag F1 is set to a value 0 as an initial value by the charging start routine, and is set to a value 1 when the charging current value I is switched, as described later.

When the late charging determination flag F1 has a value of 0, the charging current value I (value I1) is multiplied by the charging efficiency e and the cycle time Δt (for example, 10 seconds) of this routine, and this is discharged. The dischargeable capacity Cn is obtained as a new estimated value in addition to the dischargeable capacity Cn, and this new dischargeable capacity Cn is described at a predetermined address of the RAM 20c (step S130). When the dischargeable capacity Cn is described at a predetermined address of the RAM 20c, the CPU 20a executes a display routine (not shown), so that the dischargeable capacity Cn is output to the display device 24 and displayed on the display device 24.

Next, the temperature T of the battery 10 measured by the thermometer 14 and the charging voltage V measured by the voltmeter 16 are read in via the input processing circuit 20d (step S140). The gas generation voltage V (T) is obtained based on the read temperature T (step S150). The graph showing the relationship between the temperature T and the gas generation voltage V (T) is stored in advance in the ROM.
20b. Temperature T and gas generation voltage V
An example of a graph showing the relationship with (T) is shown in FIG.

This gas generation voltage V (T) is calculated by the battery 1
As the charging of 0 progresses, an electrochemical reaction (electrolysis) of water occurs in the battery 10 in addition to the electrochemical reaction of the active material,
It is a voltage at which gas is generated inside the battery 10 or a voltage immediately before gas is generated. Gas generation voltage V (T)
Is obtained by an experiment depending on the type of the battery 10 and the like.

Obtained gas generation voltage V (T) and charging voltage V
Are compared with each other (step S160), and when the charging voltage V is smaller, this routine is ended. When the charging voltage V is equal to or higher than the gas generation voltage V (T), the gas generation dischargeable capacity Cn (T) is obtained based on the temperature T of the battery 10, and the value (for example, 80%) is substituted into the dischargeable capacity Cn. Yes (step S170). Dischargeable capacity C when gas is generated
n (T) is a dischargeable capacity when charging is performed until gas is generated inside the battery 10. A graph showing the relationship between the dischargeable capacity Cn (T) at the time of gas generation and the temperature T of the battery 10 is stored in advance in the ROM 20b. Dischargeable capacity Cn (T) at the time of gas generation and battery 10
FIG. 5 shows an example of a graph showing the relationship with the temperature T of.

Subsequently, a value I2 smaller than the value I1 is assigned to the charging current value I (step S180), a value 1 is assigned to the late charging determination flag F1 (step S190), and this routine is ended. When the charging current value I is set to a value I2 which is smaller than the value I1, the charging voltage V decreases and the battery 10
The generation of gas inside the machine stops.

When the CPU 20a executes this routine after substituting the value 1 for the late charge determination flag F1, it determines that the late charge determination flag F1 is the value 1 in step S120, and the charge current value I (value I2) is set. A new dischargeable capacity Cn is obtained by multiplying the charging efficiency e by the cycle time Δt and adding it to the dischargeable capacity Cn (step S200). Then, the charging voltage V is read (step S210), and this charging voltage V is compared with a predetermined voltage Vset (step S).
220). The predetermined voltage Vset is a charging voltage at which the battery 10 is fully charged when the battery 10 is charged with the charging current value I (value I2), and the type of the battery 10 and the charging current value I
(Value I2).

When the charging voltage V is smaller, the routine is terminated without doing anything, and the charging voltage V becomes the predetermined voltage Vse.
When t or more, it is determined that the charging is completed, the dischargeable capacity at full charge (100%) is assigned to the dischargeable capacity Cn (step S230), and the value 1 is assigned to the charge completion determination flag F2. (Step S240), this routine ends. Here, the charging completion determination flag F2 is a flag for determining whether the battery 10 is fully charged, and a value 0 is assigned by a charging start routine (not shown) executed at the start of charging.

After the charge completion judgment flag F2 becomes 1, the CPU 20a executes a charge completion routine (not shown) to output a drive signal to the connection switch 30c of the charger 30 via the output processing circuit 20e. Then, the connection between the charger 30 and the battery 10 is cut off. As a result, charging ends.

The operation of the charging system described above will be described with reference to FIG. FIG. 6 is an explanatory diagram illustrating changes in the charging current value I, the charging voltage V, and the dischargeable capacity Cn during charging of the battery 10. When the charging is started, the dischargeable capacity Cn is calculated every time the dischargeable capacity estimation routine is executed.
It is estimated and updated based on the dischargeable capacity Cn, the charging current value I1 and the charging efficiency e (step S120). When the battery 10 is not completely discharged, the estimated value of the dischargeable capacity Cn at the start of charging is the dischargeable capacity Cn (t
In the case of 1), the dischargeable capacity Cn is represented as a curve after time t1.

When the charging voltage V reaches the gas generation voltage V (T) at the time t2 as charging progresses, the dischargeable capacity Cn is updated to the value of the gas generation dischargeable capacity Cn (T) regardless of the current value. (Step S170), the charging current value I is the value I
It is switched to 2 (step S180). As a result,
The charging voltage V once drops. When the charging further proceeds and the charging voltage V reaches the predetermined voltage Vset, the dischargeable capacity Cn is updated to the fully chargeable dischargeable capacity (100%), and the charging is completed.

In the dischargeable capacity value setting device of the above-described embodiment, the dischargeable capacity Cn is updated according to a predetermined relationship at the time when gas is generated in the battery 10, so charging is not performed until full charge. However, it is possible to prevent the accumulation of the error between the estimated value and the actual value of the dischargeable capacity by charging until the gas generation time. As a result, the error between the estimated value and the actual value of the dischargeable capacity Cn estimated during discharging can be reduced. Therefore, even if charging is repeated until the battery is not fully charged, the dischargeable capacity Cn displayed while the vehicle is traveling is sufficient to actually discharge the vehicle, but the vehicle cannot be driven. Nothing happens.

Also, the dischargeable capacity Cn (T) at the time of gas generation
Since the value of was calculated from the relationship with the temperature T of the battery 10,
A more accurate estimated value can be obtained. Further, since the time when the gas is generated inside the battery 10 is obtained from the relationship between the temperature T of the battery 10 and the gas generation voltage V (T),
It is possible to minimize a decrease in charging efficiency due to a sharp increase in internal resistance due to gas generation and to shorten a charging time. In addition, since the dischargeable capacity Cn is updated with the fully chargeable dischargeable capacity (100%) when the charging is completed, a slight difference between the estimated value and the actual value of the dischargeable capacity from the time of gas generation to the full charge. The error can also be corrected. Since the battery 10 is charged by the two-stage constant current method, the charging can be completed in a short time and the charging efficiency can be improved.

In the embodiment, the gas generation voltage V (T) is obtained based on the temperature T of the battery 10, but the gas generation voltage V (T) may be set to a predetermined value regardless of the temperature T. In the vicinity where gas is generated inside the battery 10,
This is because the charging voltage V rapidly increases, and even if the gas generation voltage V (T) is set to a predetermined value, a slight difference in gas generation will occur. However, the battery 10
Since the generation of gas inside the battery is not in a favorable state for the battery 10 because the charging efficiency e is low, it is desirable to set the voltage value at which gas is not generated to the gas generation voltage V (T).

In the embodiment, the dischargeable capacity Cn (T) at the time of gas generation is obtained based on the temperature T of the battery 10 and the value is substituted for the dischargeable capacity Cn. A configuration in which the capacity Cn (T) is set to a predetermined value and the value is substituted for the dischargeable capacity Cn may also be used. Further, in the embodiment, when the charging voltage V becomes equal to or higher than the predetermined voltage Vset, the full charging is performed. However, a configuration in which the charging current value I is switched to the value I2 and a predetermined time elapses and then the full charging is performed is also preferable. is there.

In the embodiment, the charger 30 is not mounted on the vehicle, but it may be mounted on the vehicle. In this case, the battery 10 can be charged by receiving electric power from the commercial AC power supply through the connection terminal 32, so that the battery 10 can be charged at any place if the commercial AC power supply is available.

Next, a charging system including a dischargeable capacity value setting device according to a second embodiment of the present invention will be described. The charging system of the second embodiment has the same configuration except the charger 30 of the charging system of the first embodiment. The same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

FIG. 7 is a block diagram illustrating the outline of the configuration of the charger 40 of the second embodiment. As shown in the figure, the charger 40 includes a rectifier circuit 40a, a constant current circuit 40b that sets a charging current value to a constant current value I1, a constant voltage circuit 40c that sets a charging voltage value to a constant voltage value V1, and a rectifier circuit 40a. And a constant current circuit 40b and a constant voltage circuit 40c are provided between the constant current circuit 40b and the constant current circuit 40b to charge the battery 10 at a constant current or a constant voltage depending on the drive signal from the control device 20. A changeover switch 40d that selectively changes and a connection switch 40e that receives a predetermined drive signal from the control device 20 and controls connection between the constant current circuit 40b or the constant voltage circuit 40c and the battery 10 are provided. The charger 40 also includes a connection terminal 42 that receives power from a commercial AC power source, a connection terminal 44 that connects to the battery 10, and a connection terminal 46 that receives a control signal from the control device 20.

The charging system of the second embodiment thus constructed operates as follows. When connecting terminals 18 and 44 and connecting terminals 22 and 46 are connected and charging is started, CP
The U 20a first executes a charging start routine (not shown) stored in advance in the ROM 20b, and outputs the output processing circuit 20e.
A drive signal is output to the changeover switch 40d of the charger 40 via the to select the constant current circuit 40b, and a control signal for enabling the connection between the charger 40 and the battery 10 is output to the connection switch 40e. In this routine, C
The PU 20a sets the initial value of each control flag. After these processes, the charger 40 starts charging the battery 10 with a constant current of the charging current value I1.

When the charging is started, the CPU 20a executes the dischargeable capacity estimation routine illustrated in FIG. 8 every predetermined time, for example, every 10 seconds. This routine is ROM2
0b, many processes are the same as the dischargeable capacity estimation routine of the first embodiment. Therefore,
Detailed description of the same processing will be omitted.

When this routine is executed, first, CP
The U 20a reads the dischargeable capacity Cn described in the predetermined address of the RAM 20c (step S300), and determines the charging efficiency e based on the read dischargeable capacity Cn (step S310). Next, the late charging determination flag F
1 (step S320), and when the late charging determination flag F1 has a value of 0, the charging current value I1 is multiplied by the charging efficiency e and the cycle time Δt (for example, 10 seconds) of this routine to discharge the dischargeable capacity Cn. In addition, the dischargeable capacity Cn is obtained as a new estimated value (step S330).

The temperature T and the charging voltage V of the battery 10 are read (step S340), the gas generation voltage V (T) is obtained based on the temperature T (step S350), and the gas generation voltage V (T) and the charging voltage V are obtained. And (step S3
60). When the charging voltage V is equal to or higher than the gas generation voltage V (T), the dischargeable capacity during gas generation Cn (T) is obtained based on the temperature T of the battery 10, and the value is calculated as the dischargeable capacity Cn.
To (step S370). Next, the changeover switch 40d is connected to the constant current circuit 40b via the output processing circuit 20e.
Output a drive signal to switch from the constant voltage circuit 40c to
The charging is switched to the charging at the constant voltage V1 (step S380). Then, the value 1 is assigned to the late charging determination flag F1 (step S390), and this routine is ended.

When the CPU 20a executes this routine after substituting the value 1 for the late charge determination flag F1, it determines that the late charge determination flag F1 has the value 1 in step S320, and reads the charge current value I (step S400). ).
A new dischargeable capacity Cn is obtained by multiplying the read charging current value I by the charging efficiency e and the cycle time Δt (for example, 10 seconds) of this routine to add to the dischargeable capacity Cn (step S410). Next, the charging current value I and the predetermined current Is
et is compared (step S420), and when the charging current value I is larger, this routine is ended without doing anything,
When the charging current value I is less than or equal to the predetermined current Iset, it is determined that the charging is completed, and the dischargeable capacity at full charge (100%) is substituted for the dischargeable capacity Cn (step S43).
0), the value 1 is assigned to the charging completion determination flag F2 (step S440), and this routine ends. Here, the predetermined current Iset is a charging current when the battery 10 is fully charged when the battery 10 is charged with the charging voltage value V1. This value is determined by the type of the battery 10 and the charging voltage value V1.

The operation of the charging system according to the second embodiment described above will be described with reference to FIG. FIG. 9 shows the battery 10
Current value I, charging voltage V and dischargeable capacity C during charging
It is explanatory drawing which illustrated the change of n. When you start charging,
The dischargeable capacity Cn is estimated and updated based on the dischargeable capacity Cn, the charging current value I1 and the charging efficiency e every time the dischargeable capacity estimation routine is executed (step S).
320).

When the charging voltage V reaches the gas generation voltage V (T) at the time t2 as the charging proceeds, the dischargeable capacity Cn is updated to the value of the gas generation dischargeable capacity Cn (T) (step S370). Charge voltage V1 by changeover switch 40d
Is switched to charging with a constant voltage (step S38).
0). As the charging further progresses, the charging current value I becomes the predetermined current Is.
When it becomes et, the dischargeable capacity Cn is updated to the fully chargeable dischargeable capacity (100%), and the charging is completed.

In the dischargeable capacity value setting device of the second embodiment described above, the dischargeable capacity Cn is updated according to a predetermined relationship at the time when gas is generated inside the battery 10, so charging that is not performed until full charge is performed. Even in such a case, it is possible to prevent the accumulation of the error between the estimated value and the actual value of the dischargeable capacity by charging until the gas generation time. As a result,
The error between the estimated value and the actual value of the dischargeable capacity Cn estimated during discharging can be reduced. Therefore, even if charging is repeated until the battery is not fully charged, the dischargeable capacity Cn displayed while the vehicle is traveling is enough to allow the vehicle to fully discharge, but the vehicle cannot actually travel. It does not happen.

Also, the dischargeable capacity Cn (T) at the time of gas generation
Since the value of is calculated from the relationship with the temperature T of the battery 10, a more accurate estimated value can be obtained. Furthermore, the time when the gas is generated inside the battery 10
Since it was obtained from the relationship between the temperature T and the gas generation voltage V (T), it is possible to minimize the decrease in charging efficiency due to a sharp increase in internal resistance due to gas generation and to shorten the charging time. In addition, since the dischargeable capacity Cn is updated with the fully chargeable dischargeable capacity (100%) when the charging is completed, a slight difference between the estimated value and the actual value of the dischargeable capacity from the time of gas generation to the full charge. The error can also be corrected.
Since the battery 10 is charged by the constant current / constant voltage method, the charging can be completed in a short time and the charging efficiency can be increased.

The embodiments of the present invention have been described above.
The present invention is not limited to these examples, and it goes without saying that the present invention can be implemented in various modes without departing from the scope of the present invention.

[0051]

As described above, in the dischargeable capacity value setting device according to the first aspect of the present invention, even if the storage battery is not fully charged, the predetermined value related to the state in which the storage battery generates the gas that accompanies the charging. When a state is reached, a predetermined value set in advance is set as the estimated value of the dischargeable capacity, so that an error between the estimated value and the actual value may accumulate even in a usage situation in which the battery is not often fully charged. Instead, a more accurate estimated value can be obtained. Therefore, the error between the estimated value and the actual value of the dischargeable capacity estimated during discharging can be reduced.

In the dischargeable capacity value setting device according to the second aspect, the predetermined state of the storage battery for setting the estimated value is set to the state where the charging voltage is equal to or higher than the predetermined voltage, so that the predetermined state can be easily detected. , The accuracy of the estimated value can be improved.

In the dischargeable capacity value setting device according to the third aspect, the estimated value of the dischargeable capacity is set on the basis of the relationship between the temperature of the storage battery and the dischargeable capacity in a predetermined state of the storage battery. Can be

In the dischargeable capacity value setting device according to the fourth aspect, since the dischargeable capacity is always estimated during charging, it is possible to know the current estimated value of the dischargeable capacity and the charging stage. Moreover, after the storage battery reaches the predetermined state, the dischargeable capacity is calculated based on the charging current with reference to the predetermined value set by the capacity estimated value setting means, so the estimated value of the dischargeable capacity is set with high accuracy. can do.

In the dischargeable capacity value setting device according to the fifth aspect, even when full charge is detected, the dischargeable capacity is reset to a predetermined full charge state, so that the accumulation of errors can be further suppressed. .

[Brief description of drawings]

FIG. 1 is a block diagram showing an outline of a charging system centered on a control device 20 including a dischargeable capacity value setting device according to an embodiment of the present invention.

FIG. 2 is a flowchart illustrating a dischargeable capacity estimation routine executed by a CPU 20a.

FIG. 3 is a graph showing an example of the relationship between the dischargeable capacity Cn and the charging efficiency e.

FIG. 4 is a graph showing an example of the relationship between temperature T and gas generation voltage V (T).

FIG. 5 is a graph showing an example of the relationship between temperature T and dischargeable capacity Cn (T) during gas generation.

6 is an explanatory diagram showing an example of a charging current value I, a charging voltage V, and a dischargeable capacity Cn during charging of the battery 10. FIG.

FIG. 7 is a charger 40 in the charging system according to the second embodiment.
3 is a block diagram showing an outline of the configuration of FIG.

FIG. 8 is a flowchart exemplifying a dischargeable capacity estimation routine executed by the CPU 20a of the second embodiment.

FIG. 9 is an explanatory diagram showing an example of a charging current value I, a charging voltage V, and a dischargeable capacity Cn during charging of the battery 10 of the second embodiment.

[Explanation of symbols]

 10 ... Battery 12 ... Anode 13 ... Cathode 14 ... Thermometer 16 ... Voltmeter 17 ... Ammeter 18 ... Connection terminal 19 ... Output terminal 20 ... Control device 20a ... CPU 20b ... ROM 20c ... RAM 20d ... Input processing circuit 20e ... Output Processing circuit 22 ... Connection terminal 24 ... Display device 30 ... Charger 30a ... Rectifier circuit 30b ... Constant current circuit 30c ... Connection switch 32 ... Connection terminal 34 ... Connection terminal 36 ... Connection terminal 40 ... Charger 40a ... Rectifier circuit 40b ... Constant Current circuit 40c ... Constant voltage circuit 40d ... Changeover switch 40e ... Connection switch 42 ... Connection terminal 44 ... Connection terminal 46 ... Connection terminal

Claims (5)

[Claims] 1. A dischargeable capacity value setting device for setting a dischargeable capacity value stored in the storage battery by charging when charging the chargeable / dischargeable storage battery. A discharge including a state detecting means for detecting a predetermined state related to a state in which the discharge occurs, and an estimated value setting means for setting a predetermined value as an estimated value of the dischargeable capacity when the predetermined state is detected. Possible capacity value setting device. 2. The dischargeable capacity value setting device according to claim 1, further comprising voltage detection means for detecting a charging voltage of the storage battery, wherein the state detection means detects the predetermined state by the voltage detection means. A dischargeable capacity value setting device, which is means for detecting that the detected charging voltage is equal to or higher than a predetermined voltage. 3. The dischargeable capacity value setting device according to claim 1, further comprising: a temperature detecting unit that detects a temperature of the storage battery, and a relationship between the temperature of the storage battery and the dischargeable capacity in the predetermined state. The estimated value setting means obtains the predetermined value with reference to the relationship stored in the relationship storage means based on the temperature detected by the temperature detection means, and the estimated value setting means can discharge the predetermined value. A dischargeable capacity value setting device which is means for setting an estimated value of capacity. 4. The dischargeable capacity value setting device according to claim 1, further comprising: a pre-charge capacity estimating unit that estimates a dischargeable capacity of the storage battery before charging, and a charging current of the storage battery is detected. Before detecting the predetermined state by the state detecting means, the dischargeable capacity based on the dischargeable capacity estimated by the pre-charge capacity estimating means and the charging current detected by the current detecting means. After detecting the predetermined state by the state detecting means, the dischargeable capacity is calculated based on the charging current detected by the current detecting means with reference to the predetermined value set by the capacity estimated value setting means. And a dischargeable capacity value setting device. 5. The dischargeable capacity value setting device according to claim 1, further comprising: a full-charge detecting unit that detects a full charge of the storage battery; and a predetermined full charge when the full charge is detected. A dischargeable capacity value setting device comprising: a full charge capacity setting means for setting a charge capacity as a dischargeable capacity.