JPH11162523A - Battery management device for electric vehicles - Google Patents

Abstract

(57) [Problem] To provide a battery management device for an electric vehicle capable of notifying a user or the like of the generation of hydrogen gas below a lower explosion limit value and confirming an abnormal state of a battery or the like. SOLUTION: A hydrogen sensor 13a detects the concentration of hydrogen gas generated from a battery 11 for charging and discharging a battery 11 for running an electric vehicle, and a first concentration determination unit 21 detects the concentration of hydrogen gas. The detected concentration value is input, and it is determined whether the detected concentration value is equal to or higher than a predetermined concentration value equal to or lower than the lower explosion limit value, and the occurrence counter 23 determines whether the detected concentration value has exploded during charging and discharging of the battery. The number of occurrences when the density becomes equal to or higher than the predetermined density value equal to or lower than the lower limit value is counted, and the display unit 28 displays the counted occurrence number.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery management device for an electric vehicle for managing a battery for an electric vehicle.
The present invention relates to a battery management device for an electric vehicle that informs a user of an abnormality even when the amount of hydrogen gas generated from a battery due to charge / discharge of the battery does not reach a lower explosive limit value, which may lead to abnormality of the battery or the like.

[0002]

2. Description of the Related Art Conventionally, in an electric vehicle, a battery (battery) of a high-power system is charged by a charger, a voltage from the charged battery is supplied to a motor as a load, and a discharge current is caused to flow. The electric vehicle is running by rotating it. When the remaining capacity of the battery falls below a certain value due to the running of the electric vehicle, the battery control unit issues a warning so as not to be overdischarged, and controls the charger to charge the battery again. I have.

When the vehicle is running on a downhill, when the accelerator is released during running, the motor becomes a generator and a regenerative current is generated. Although the battery is charged with this regenerative current, the battery control unit controls the battery voltage so as not to be overcharged.

In this case, for example, a lead battery or a nickel-metal hydride battery is used as a high-power battery, but it is known that hydrogen gas is generated from the battery during overcharge and overdischarge. Japanese Patent Application Laid-Open No. 9-45376 discloses a technique in which a hydrogen gas sensor detects the discharged hydrogen gas and informs the driver of the passing discharge state.

[0005]

However, even in a normal charge / discharge state other than overcharge or overdischarge, lead gas or the like increases the number of charge / discharge cycles of the battery, that is, hydrogen gas is generated according to the degree of deterioration. In some cases, the above-described notification only at the time of overcharging / discharging is not enough to notify the driver or the inspector of the deterioration of the battery itself or the abnormality of the charging / discharging control system.

The present invention relates to a battery management device for an electric vehicle which can notify a user or the like of the generation of hydrogen gas below a lower explosion limit value and can confirm an abnormal state such as deterioration of a battery or the like based on the state of generation of hydrogen gas. The task is to provide

[0007]

The present invention has the following arrangement to solve the above-mentioned problems. The battery management device for an electric vehicle according to the first aspect of the present invention includes a hydrogen concentration detection unit that detects a concentration of hydrogen gas generated from the battery by charging and discharging the battery for running the electric vehicle, and a hydrogen concentration detection unit. A calculating unit that calculates abnormal state degree information indicating a degree of abnormal state of the battery or the battery management device based on the detected concentration value of the detected hydrogen gas, and stores the abnormal state degree information calculated by the calculating unit. It is characterized by including a storage unit and an output unit that outputs the abnormal state degree information stored in the storage unit.

According to the present invention, the hydrogen concentration detecting section detects the concentration of hydrogen gas generated from the battery by charging and discharging the battery, and the calculating section detects the detected concentration of hydrogen gas detected by the hydrogen concentration detecting section. The abnormal state degree information indicating the degree of the abnormal state of the battery or the battery management device main body is calculated based on the value, the abnormal state degree information calculated by the calculation unit is stored in the storage unit, and the output unit is stored in the storage unit. Since the abnormal state information is output, it is possible to confirm the degree of the abnormal state such as the degree of deterioration of the battery or the like by looking at the abnormal state degree information.

The invention according to claim 2 is characterized in that the calculating section collects the detected concentration values of the hydrogen gas detected by the hydrogen concentration detecting section in a time series and stores them in the storage section in a time series. I do.

According to a third aspect of the present invention, the calculation unit includes:
A first concentration determining unit that inputs a detected concentration value detected by the hydrogen concentration detecting unit and determines whether the detected concentration value is equal to or greater than a predetermined concentration value equal to or less than a lower explosion limit value, and during charging of the battery. And a counting unit that counts, as the abnormal state degree information, the number of times the detected concentration value becomes equal to or more than the predetermined concentration value equal to or less than the lower explosion limit value during discharging.

According to the present invention, the first density determination section includes:
The counting unit determines whether the detected concentration value is equal to or higher than a predetermined concentration value equal to or lower than the lower explosion limit value, and the counting unit determines that the detected concentration value is equal to or higher than the predetermined concentration value equal to or lower than the lower explosion limit value during battery charging and discharging. Is counted as abnormal state degree information, it is possible to check the degree of deterioration of the battery and the like by checking the number of times of generation of hydrogen gas.

According to a fourth aspect of the present invention, the calculating section includes:
It is determined whether or not the detected density value is equal to or higher than a predetermined maximum density value.If the detected density value is equal to or higher than the maximum density value, the detected density value is written to the maximum density value. The rewritten and rewritten maximum density value is used as the abnormal state degree information.

According to the present invention, when the detected density value exceeds the maximum density value, the detected density value is rewritten to the maximum density value, and the rewritten maximum density value is used as the abnormal state degree information. By looking at this maximum density value, it is possible to confirm the degree of deterioration of the battery and the like.

According to a fifth aspect of the present invention, the storage unit includes:
When the discharging of the battery is completed or when the charging of the battery is completed, the abnormal state degree information calculated by the calculating unit is stored.

According to the present invention, when the discharging of the battery or the charging of the battery is completed, the abnormal state degree information is stored in the storage unit, so that the recording operation is not frequently performed.

According to a sixth aspect of the present invention, the counting section includes:
The number of times that the detected concentration value becomes equal to or higher than the predetermined concentration value equal to or lower than the lower explosion limit value during a period from the start of charging to the end of charging of the battery or from the start of discharging to the end of discharging of the battery. May be counted once.

According to a seventh aspect of the present invention, the counting section includes:
The number of times that the detected concentration value becomes equal to or higher than the predetermined concentration value equal to or lower than the lower explosion limit value during a period from the start of charging to the end of charging of the battery or from the start of discharging to the end of discharging of the battery. Is counted, the number of occurrences is integrated, and the degree of an abnormal state of the battery or the like can be confirmed more accurately.

According to an eighth aspect of the present invention, the counting section includes:
A first counting unit that counts the number of times that the detected concentration value becomes equal to or more than the predetermined concentration value that is equal to or less than the lower explosion limit value during charging of the battery, and the detected concentration value is set during discharging of the battery. A second counting unit that counts the number of occurrences when the predetermined concentration value is equal to or greater than the lower explosion limit value or less, wherein the number of occurrences during charging of the battery and the number of occurrences during discharging of the battery are determined. They can be counted separately.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a battery management device for an electric vehicle according to the present invention will be described in detail with reference to the drawings.

<Embodiment 1> FIG. 1 is a block diagram showing a configuration of an embodiment 1 of a battery management device for an electric vehicle according to the present invention. The battery management device for an electric vehicle illustrated in FIG. 1 constantly monitors the amount of hydrogen gas generated in the battery 11 using the hydrogen sensor 13a. In FIG. 1, the charger 1
Junction box (hereinafter referred to as J / B) 3
The charging current is supplied to the battery 11 in the battery box 10 via the battery box 10 to charge the battery 11. The battery box 10 has a battery 11.

The battery 11 is, for example, a lead battery,
A voltage is applied to a motor, which is charged by the charger 1 and is a load 12 for an electric vehicle, and a discharge current flows to rotate the motor to drive the electric vehicle. Battery 11
Generates hydrogen gas by repeating charge and discharge. The battery 11 has, for example, about 288 V, and is configured by connecting a plurality of batteries for, for example, 12 V in series.

The battery 11 is provided with a hydrogen sensor 13a, a temperature sensor 13b, and a voltage sensor 13c. The hydrogen sensor 13a detects a concentration value of the hydrogen gas generated in the battery 11, and outputs the detected concentration value to an electronic control unit (hereinafter, referred to as an ECU) 15.

The temperature sensor 13b detects the temperature of the battery 11, and outputs the detected temperature value to the ECU 15.
The voltage sensor 13c is provided for each battery connected in series, detects the voltage of each battery, and detects each detected voltage as E.
Output to CU15. In this case, each detection value is output to the ECU 15 through a separate signal line for each sensor.

Instead of outputting each detection value to the ECU 15 through a separate signal line for each sensor, a detection unit 14 is provided as shown in FIG.
Alternatively, the detection values detected by the hydrogen sensor 13a, the temperature sensor 13b, and the voltage sensor 13c may be collected, and the detection values may be output to the ECU 15 by multiplex communication using an optical fiber or the like.

The J / B 3 has a current sensor 31 and a voltage sensor 33. The current sensor 31 detects a current flowing from the battery 11 to the load 12, and outputs the current value to the ECU 15
Output to The voltage sensor 33 detects the terminal voltage of the whole battery connected in series, and detects the voltage value of the battery in the ECU 1.
5 is output. J / B3 is ignition (IGN)
A signal is input and the signal is output to the ECU 15.

The ECU 15 is a battery control unit that controls the charger 1 based on the voltage of each battery 11 from the voltage sensor 13c and the total voltage from the voltage sensor 33, and determines whether each battery is abnormal. The ECU 15 determines whether the temperature of the battery 11 is abnormal based on the temperature value from the temperature sensor 13b. When the temperature rises abnormally, the ECU 15 cools the battery 11 by rotating a fan (not shown).

The ECU 15 determines the abnormality of the hydrogen concentration and the abnormality of the battery 11 based on the concentration value of the hydrogen gas from the hydrogen sensor 13a.
Write / read unit 18, nonvolatile memory 20a, random access memory (RAM) 20b, read-only memory (ROM) 20c, first density determination unit 21, flag processing unit 22, occurrence counter 23, second density determination Part 24
It is comprised including.

The charge / discharge judging section 17 judges whether the ignition is turned on and judges whether the battery 11 is being charged. The write / read unit 18 includes a nonvolatile memory 20a,
Writing information to the RAM 20b and the ROM 20c;
And read.

As shown in FIG. 2, the ROM 20c stores a predetermined concentration value (for example, 6000) below the lower limit value of the explosion of hydrogen gas.
ppm, 10000 ppm). RAM2
0c is a flag F set to "1" and "0" as shown in FIG. 3, an occurrence count value indicating the number of occurrences of hydrogen gas having a concentration equal to or higher than a predetermined concentration value equal to or lower than the lower explosion limit value,
The maximum concentration value of hydrogen gas is stored.

The non-volatile memory 20c is writable and readable, and retains its stored contents even when the power is off.
It is a PROM, and stores the occurrence count value and the maximum density value as shown in FIG.

The first concentration judging section 21 is provided with the hydrogen sensor 13
The detected density value detected at a.
It is determined whether the detected density value is larger than the maximum density value read from the AM 20b. If the detected density value is larger than the maximum density value, the maximum density value is rewritten.

The first density determination section 21 determines that the detected density value is R
It is determined whether the density is equal to or higher than the predetermined density value stored in the OM 20c.

When the flag F is "0", the flag processor 22 sets the flag F to "1" after counting up the occurrence count value, and the flag F is "1". In this case, the flag F is set to "0" when the ignition is turned off from on (discharge end) or when charging is ended without counting up the occurrence count value. The occurrence counter 23
Only when the flag F is "0", the count value of the number of occurrences in which the concentration value of the hydrogen gas becomes equal to or higher than the predetermined concentration value equal to or lower than the lower explosion limit value is increased by one.

The second concentration determination section 24 is provided with the hydrogen sensor 13
The detected concentration value detected at a is equal to or more than 1/4 of the lower explosive limit value read from the ROM 20c (10000 ppm).
Is determined, and the detected concentration value is 10,000p
When the speed becomes equal to or more than pm, an alarm signal is output to the alarm lamp 27, and the alarm lamp 27 is turned on.

The write / read unit 18 stores the maximum density value and the occurrence count value in the non-volatile memory 20a when the ignition is turned off from on or when charging of the battery is completed. . The display unit 28 displays the occurrence count value stored in the non-volatile memory 20a,
Displays the highest density value.

The display unit 28 displays, based on each signal from the ECU 15, an indication of a temperature abnormality of the battery 11, an indication of an abnormality of each battery connected in series, an indication of a decrease in the remaining capacity of the battery 11, and an indication of a remaining capacity. The value may be digitally displayed.

The DC / DC converter 35 supplies a high-voltage (about 288 V) from the battery 11 via the J / B3.
Is converted into a 12V power supply of a weak electric system, and the 12V power supply is supplied to the auxiliary battery 37. The auxiliary battery 37 has a voltage of 12 V
The ECU 15 is operated by supplying power to the ECU 15.

Next, Embodiment 1 configured as described above
The operation of the electric vehicle battery management device will be described with reference to a flowchart shown in FIG. Embodiment 1
Therefore, even if the detected density value exceeds a predetermined density value a plurality of times during the period from the ignition on to off or from the start of charging to the end of charging, the occurrence count value is set to one. Process as

First, the battery 11 is charged by the charger 1, and thereafter, a discharge current is supplied from the battery 11 to the load 12 to run an electric vehicle (not shown). Then, when charging and discharging of the battery 11 are repeated, hydrogen gas is generated from the battery 11.

Next, the charge / discharge determination unit 17 determines whether or not the ignition (IGN) is on (ON) based on the input ignition signal (step S11).
If the ignition is off, the charge / discharge determination unit 17
Based on the charge control signal, it is determined whether the battery 11 is being charged (step S13). If the battery 11 is not being charged, the sleep mode is set (step S1).
5).

When the ignition is on (the electric vehicle is running and the battery 11 is being discharged) or charging, the write / read section 18 reads the nonvolatile memory 2
The occurrence count value and the maximum density value are read from 0a and written into the RAM 20b (step S17). The initial value of the occurrence count value is zero. The number of occurrences and the maximum concentration value are one of the abnormal state degree information indicating the degree of the abnormal state of the battery 11 or the battery management device main body.

Next, the hydrogen sensor 13a is connected to the battery 11
The concentration of hydrogen gas generated from the gas is detected (step S1).
9). The detected concentration value detected by the hydrogen sensor 13a is EC
It is input to the first density determination unit 21 in U15. The first concentration determination unit 21 reads the maximum concentration value stored in the RAM 20b, and determines whether the detected concentration value detected by the hydrogen sensor 13a is larger than the maximum concentration value (Step S21).

If the detected density value is larger than the maximum density value, the writing / reading section 18 rewrites the maximum density value already stored in the RAM 20b with the detected density value and sets the detected density value to the maximum density value. (Step S23). Thus, the maximum density value is stored in the RAM 20b.

On the other hand, when the detected density value is lower than the maximum density value, the first density determination section 21 determines that the detected density value is RO
The predetermined density value stored in M20c (for example, 6000p
pm or, for example, 10,000 ppm) or more (step S25).

If the detected density value is equal to or higher than the predetermined density value, the flag processing unit 22 determines whether the flag F is "0" (step S27). If the flag F is “0”, the occurrence counter 23 counts up the occurrence count value by 1 (step S29).
That is, the count value of the number of occurrences in which the concentration value of the hydrogen gas becomes equal to or higher than the predetermined concentration value equal to or lower than the lower explosion limit value is incremented by 1, and the count value is stored in the RAM 20b. Then, the flag F is set to "1" (step S31).

If the detected density value is less than the predetermined density value in step S25, the process immediately proceeds to step S39 without counting up the occurrence count value. If the flag F is not “0” in step S27, that is, if the number of occurrences of the detected density value exceeding the predetermined density value is two or more, the occurrence count value is not counted up. Then, the process immediately proceeds to step S33.

Thus, even if the detected density value exceeds a predetermined density value a plurality of times between the time when the ignition is turned on and the time when the ignition is turned off, or the time between the start and end of charging, the number of occurrences is counted. The value is treated as one time.

Next, the writing / reading section 18 reads the lower explosion limit value stored in the ROM 20c, and the second concentration judging section 24 reads the detected concentration value detected by the hydrogen sensor 13a at 10,000 ppm. It is determined whether or not the above has occurred (step S33).

When the detected concentration value exceeds 10000 ppm, the second concentration determination unit 24
Is output, and the alarm lamp 27 is lit upon receiving the alarm signal (step S35). That is, by lighting the alarm lamp 27, it can be notified that the amount of generated hydrogen gas is equal to or higher than the lower explosion limit value and is abnormal. In addition,
If the detected concentration value is less than the lower explosive limit value, the alarm is released (step S37).

Next, the charge / discharge determination unit 17 determines whether the ignition has been turned off from on based on the input ignition signal (step S39).
When the ignition is turned off from on, the flag F is set to "0" (step S41), and the writing / reading unit 18 stores the occurrence count value and the maximum density value stored in the RAM 20b in the nonvolatile memory. 20a (step S43).

If the ignition remains on, the charge / discharge determination unit 17 next determines whether or not charging of the battery 11 has been completed based on the charge control signal (step S45). When the charging of the battery 11 has been completed, the processing of steps S41 and S43 is performed. Further, returning to the processing of step S11,
The processes after 11 are repeated.

The write / read section 18 reads the occurrence count value and the maximum density value stored in the non-volatile memory 20a and causes the display section 28 to display them. Therefore, the degree of the abnormal state of the battery 11 or the battery management device for an electric vehicle can be confirmed by looking at the occurrence count value and the maximum concentration value. That is, when the occurrence count value or the maximum density value is large, it indicates that the degree of the abnormal state of the battery 11 or the like has increased.

The count value and the maximum concentration value stored in the non-volatile memory 20a are output to a display unit or a diagnosis unit (diagnosis unit) in the meter for the electric vehicle, and the battery 11 or the battery for the electric vehicle is output. An abnormal state of the management device may be confirmed.

<Second Embodiment> Next, a battery management device for an electric vehicle according to a second embodiment of the present invention will be described. FIG. 6 is a configuration block diagram of a battery management device for an electric vehicle according to a second embodiment of the present invention. In the first embodiment, even if the detected density value exceeds a predetermined density value a plurality of times during the period from the time when the ignition is turned on to the time when the ignition is turned off, or from the time when the charging is started to the time when the charging is completed, Values were treated as one.

In the second embodiment, when the detected density value exceeds a predetermined density value a plurality of times between the time when the ignition is turned on and the time when the ignition is turned off or the time between the start of charging and the end of charging, Is characterized in that the number of occurrences during that period is counted up. For example, as shown in FIG. 8, when the number of times that the detected concentration value of hydrogen exceeds a predetermined concentration value between the time when the ignition is turned on and the time when the ignition is turned off is three, the number of times that the hydrogen is generated is set to one. Count twice and three times.

For this reason, the second embodiment is different from the flag processing unit 22 of the first embodiment in the configuration of the flag processing unit 22a.
Is different only in the configuration. Other configurations are the same as those of the first embodiment, and therefore, the same portions are denoted by the same reference characters and detailed description thereof will not be repeated.

The flag processing section 22a sets the flag F to "0" when the detected density value is less than the predetermined density value, and sets the occurrence count value when the flag F is "0". After the count-up, the flag F is set to "1". When the flag F is "1", the occurrence count value is not counted up.

Next, the operation of the electric vehicle battery management apparatus according to the second embodiment will be described with reference to the flowchart of FIG. Here, only the flag processing, which is the main flow of the second embodiment, will be described. The other parts are the same as the flow of the first embodiment, and the description thereof is omitted.

First, in step S25, when the detected density value is less than the predetermined density value, the flag F is set to "0".
After setting (step S26), the process proceeds to step S39.

In step S25, the detected density value is equal to or higher than the predetermined density value.
If the flag F is "0", the occurrence count value is counted up (step S29), the flag F is set to "1" (step S31), and then the step S31 is executed.
It proceeds to the process of 33. When the flag F is "1", the occurrence count value is not incremented.
That is, every time the detected density value becomes equal to or more than the predetermined density value, the flag F is set to “1” and “0” alternately, and the occurrence count value is counted up.

As described above, by the flag processing, during the period from when the ignition is turned on (during running or discharging) to when the ignition is turned off,
Alternatively, if the number of occurrences in which the detected density value exceeds the predetermined density value is a plurality of times between the start of charging and the end of charging, the number of occurrences during that time can be counted up. As a result, the degree of the abnormal state of the battery 11 or the like can be more accurately confirmed by checking the number of occurrences.

Third Embodiment Next, an electric vehicle battery management device according to a third embodiment of the present invention will be described. FIG. 9 is a configuration block diagram of Embodiment 3 of the battery management device for an electric vehicle according to the present invention. In the third embodiment, the maximum density value is calculated separately as the maximum density value when the ignition is turned on and the maximum density value during charging, and the occurrence count value is calculated as the occurrence count value when the ignition is turned on and the occurrence count during the charging. It is characterized in that it is calculated separately from the count value.

For this reason, in the third embodiment, the first occurrence counter 23 for counting up the number of occurrences during charging is used.
a, a second occurrence counter 23b which counts up the number of occurrences when the ignition is turned on. Other configurations are the same as those of the first embodiment, and therefore, the same portions are denoted by the same reference characters and detailed description thereof will not be repeated.

Next, the operation of the electric vehicle battery management apparatus according to the third embodiment will be described with reference to the flowchart of FIG. Here, only the main flow of the third embodiment will be described. The other parts are the same as the flow of the first embodiment, and the description thereof is omitted.

First, in step S21, when the detected density value is larger than the maximum density value, it is next determined whether charging is in progress (step S22). If charging is being performed, the maximum density value during charging is rewritten (step S).
23a), and proceed to step S25. If the ignition is on, the maximum density value when the ignition is on is rewritten (step S23b), and the process proceeds to step S25.

In step S27, the flag F
Is "0", it is determined whether charging is in progress (step S28). If charging is being performed, the count value of the number of occurrences during charging is increased (step S29a). If the ignition is on, the occurrence count value when the ignition is on is increased (step S29).
b).

After setting the flag F to "1" (step S31), the process proceeds to step S33. When the flag F is "1", the occurrence count value is not incremented.

The count value of the number of occurrences when the ignition is turned on, the count value of the number of occurrences during the charge, the maximum density value when the ignition is on, and the maximum density value during the charge are stored in the nonvolatile memory 20a as shown in FIG. Is done. In addition, the read values are individually displayed on the display unit 28, so that it is possible to know whether the occurrence count value and the maximum density value are larger when the ignition is on or during charging.

As described above, according to the battery management device for an electric vehicle of the embodiment, the concentration of hydrogen gas generated during discharging or charging of battery 11 is detected, and the concentration value of the hydrogen gas becomes lower than the lower explosion limit. An abnormal state of the battery 11 or the battery management device for an electric vehicle can be confirmed by storing the number of occurrences of the predetermined concentration value equal to or less than the predetermined value in the non-volatile memory 20a and checking the number of occurrences at the time of maintenance or the like. .

Since the number of occurrences is stored in the non-volatile memory 20a, even if the battery of the weak electric power system is removed by replacement or the like, the stored information on the number of occurrences is not erased. Further, when the ignition is turned off or when charging of the battery 11 is terminated, the number of occurrences counted during discharging or charging is stored in the nonvolatile memory 20a.
Since the storage operation is not performed frequently, the memory can be used within the allowable number of rewrites of the nonvolatile memory 20a, and the storage operation time does not affect the normal processing.

The present invention is not limited to the electric vehicle battery management devices of the first to third embodiments. In the embodiment, a lead battery is used as the battery 11, but a nickel hydrogen battery may be used as the battery 11, for example. Further, the present invention may be used in combination with the configuration of Embodiment 3 and the configuration of Embodiment 2.

[0072]

According to the present invention, the hydrogen concentration detecting section detects the concentration of hydrogen gas generated from the battery by charging and discharging the battery, and the calculating section detects the concentration of the hydrogen gas detected by the hydrogen concentration detecting section. Calculates abnormal state degree information indicating the degree of abnormal state of the battery or the battery management device body based on the detected concentration value, stores the abnormal state degree information calculated by the calculator in the storage section, and stores the output section in the storage section. Since the detected abnormal state degree information is output, it is possible to confirm the degree of the abnormal state such as the degree of deterioration of the battery or the like by looking at the abnormal state degree information.

The first concentration judging section judges whether or not the detected concentration value is equal to or higher than a predetermined concentration value equal to or lower than the lower explosion limit value, and the counting section detects whether the detected concentration value is during charging or discharging of the battery. The number of occurrences when the concentration value is equal to or higher than the predetermined concentration value equal to or lower than the lower explosion limit value is counted as abnormal state degree information, so by observing the number of generations of hydrogen gas, it is possible to determine the degree of deterioration of the battery etc. You can check.

When the detected density value is equal to or higher than the maximum density value, the detected density value is rewritten to the maximum density value, and the rewritten maximum density value is used as the abnormal state degree information.
By looking at this maximum density value, it is possible to confirm the degree of deterioration of the battery and the like.

When the discharge of the battery or the charging of the battery is completed, the abnormal state information is stored in the storage unit, so that the recording operation is not frequently performed.

Further, the counting section determines that the detected concentration value is equal to or higher than a predetermined concentration value equal to or lower than the lower explosion limit value between the start of charging and the end of charging of the battery or between the start of discharging of the battery and the end of discharging. The counting process can be performed with the number of occurrences as one.

Further, the counting section determines that the detected density value is equal to or higher than a predetermined density value equal to or lower than the lower explosion limit value from the start of charging of the battery to the end of charging, or from the start of discharging of the battery to the end of discharging. If the number of occurrences is counted, the number of occurrences is integrated, and the degree of the abnormal state of the battery or the like can be confirmed more accurately.

The number of occurrences during the charging of the battery and the number of occurrences during the discharging of the battery can be separately counted.

[Brief description of the drawings]

FIG. 1 is a configuration block diagram of Embodiment 1 of an electric vehicle battery management device of the present invention.

FIG. 2 is a diagram showing stored contents of a ROM according to the first embodiment.

FIG. 3 is a diagram showing stored contents of a RAM according to the first embodiment;

FIG. 4 is a diagram showing stored contents of a nonvolatile memory according to the first embodiment;

FIG. 5 is a flowchart showing an operation of the electric vehicle battery management device according to the first embodiment.

FIG. 6 is a configuration block diagram of a battery management device for an electric vehicle according to a second embodiment of the present invention.

FIG. 7 is a flowchart showing an operation of the electric vehicle battery management device according to the second embodiment.

FIG. 8 is a diagram illustrating the number of times the detected density value exceeds a predetermined density value between the time when the ignition is turned on and the time when the ignition is turned off according to the second embodiment.

FIG. 9 is a configuration block diagram of a third embodiment of the battery management device for an electric vehicle according to the present invention.

FIG. 10 is a flowchart showing an operation of the electric vehicle battery management device according to the third embodiment.

FIG. 11 is a diagram illustrating stored contents of a nonvolatile memory according to a third embodiment;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Charger 3 J / B (Junction box) 10 Battery box 11 Battery 12 Load 13a Hydrogen sensor 13b Temperature sensor 13c, 33 Voltage sensor 15 ECU (Electronic control unit) 17 Charge / discharge determination part 18 Writing / reading part 20a Non-volatile memory Reference Signs List 20b RAM 20c ROM 21 First density determination unit 22 Flag processing unit 23 Number of occurrences counter 24 Second density determination unit 27 Alarm lamp 28 Display unit 31 Current sensor 35 DC / DC converter 37 Auxiliary battery

Continued on the front page (51) Int.Cl. ⁶ Identification code FI H02J 7/00 H02J 7/00 P

Claims (8)

[Claims] 1. A hydrogen concentration detector for detecting the concentration of hydrogen gas generated from a battery for charging and discharging a battery for running an electric vehicle, and a detected concentration value of the hydrogen gas detected by the hydrogen concentration detector. A calculating unit that calculates abnormal state degree information indicating the degree of abnormal state of the battery or the battery management device main body based on the above; a storage unit that stores the abnormal state degree information calculated by the calculating unit; An output unit for outputting the obtained abnormal state degree information. 2. The method according to claim 1, wherein the calculating unit collects the detected concentration values of the hydrogen gas detected by the hydrogen concentration detecting unit in a time series and stores the values in the storage unit in a time series.
The battery management device for an electric vehicle according to the claim. 3. The first calculating unit inputs a detected concentration value detected by the hydrogen concentration detecting unit and determines whether the detected concentration value is equal to or more than a predetermined concentration value equal to or less than a lower explosion limit value. During the charging and discharging of the battery, during the charging and discharging of the battery, a counting unit that counts, as the abnormal state degree information, the number of occurrences in which the detected concentration value is equal to or greater than the predetermined concentration value equal to or less than the lower explosive limit value. The battery management device for an electric vehicle according to claim 1 or 2, further comprising: 4. The calculation unit determines whether or not the detected density value is equal to or higher than a predetermined maximum density value, and when the detected density value is equal to or higher than the maximum density value, The battery for an electric vehicle according to any one of claims 1 to 3, wherein a detected density value is rewritten to the maximum density value, and the rewritten maximum density value is used as the abnormal state degree information. Management device. 5. The storage unit stores the abnormal state degree information calculated by the calculation unit when the discharging of the battery is completed or when the charging of the battery is completed. The battery management device for an electric vehicle according to claim 1. 6. The counting unit, wherein the detected concentration value is equal to or less than the lower explosion limit value during a period from the start of charging to the end of charging of the battery or from the start of discharging to the end of discharging of the battery. 4. The battery management device for an electric vehicle according to claim 3, wherein the number of occurrences in which the concentration exceeds a predetermined value is counted as one. 7. The method according to claim 1, wherein the counting unit determines that the detected concentration value is equal to or less than the explosion lower limit value during a period from the start of charging to the end of charging of the battery or from the start of discharging to the end of discharging of the battery. 4. The battery management device for an electric vehicle according to claim 3, wherein the number of occurrences at which the concentration exceeds a predetermined value is counted. 8. The first counting unit, wherein the counting unit counts the number of times that the detected concentration value becomes equal to or higher than the predetermined concentration value equal to or lower than the lower explosive limit value during charging of the battery; 4. The electric vehicle according to claim 3, further comprising: a second counting unit that counts the number of times that the detected concentration value becomes equal to or more than the predetermined concentration value that is equal to or less than the lower explosion limit value during the discharge of the battery. Battery management device.