JP2004023949A - Device and method for controlling charge/discharge for battery pack - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a charge/discharge control device for a battery pack, capable of taking an action corresponding to abnormality such as over-charge or -discharge. <P>SOLUTION: This charge/discharge control device includes current bypass circuits 21-2n, and bypasses charge current of a single cell when terminal voltage of any of the cells 11-1n reaches a first decision threshold which is lower than charge final voltage by a prescribed value during the charging of the battery pack 1. The charge/discharge control device includes abnormality detecting circuits 31-3n, and outputs an abnormality detection signal when the terminal voltage of any of the cells 11-1n reaches a second criterion threshold which is lower than the charge final voltage by a prescribed value at the time of charging or discharging the battery pack 1, or when it reaches a third decision threshold which is higher than a discharge final voltage by a prescribed value. A charge/discharge control circuit 5 determines that the battery pack 1 has the abnormality such as the over-charge or -discharge based on whether it is under charge control or not when an abnormality is detected by the abnormality detecting circuits 31-3n and takes an action corresponding to the respective abnormalities. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to charge / discharge control of a battery pack.
[0002]
[Prior art]
2. Description of the Related Art There is known a technique of driving a load using an assembled battery including a plurality of rechargeable cells (called cells) as a power supply. The battery pack repeatedly performs a discharging operation for driving a load and a charging operation for charging a unit cell. In such an assembled battery, the presence or absence of an abnormality is determined by detecting the terminal voltages of the cells constituting the assembled battery.
[0003]
[Problems to be solved by the invention]
Abnormalities of the cells include an overcharge abnormality and an overdischarge abnormality. If it is not clear whether overcharge or overdischarge is found when a cell abnormality is determined, both charge control and discharge control must be stopped, and appropriate processing must be performed according to the nature of the abnormality. Could not.
[0004]
An object of the present invention is to provide a charge / discharge control device and a charge / discharge control method for an assembled battery that perform appropriate processing according to the content of abnormalities of overcharge and overdischarge.
[0005]
[Means for Solving the Problems]
The present invention relates to a charge / discharge control device for controlling charging and discharging of a battery pack composed of a plurality of cells, when a detected voltage of the cell is higher than a first voltage value, and when a detected voltage of the cell is detected. Is determined to be abnormal when the battery voltage is lower than the second voltage value that is lower than the first voltage value. When an abnormality is detected during charging of the battery pack, it is determined that the battery is overcharged. It is determined that overdischarge is abnormal and a predetermined process is performed according to the determination result.
[0006]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, appropriate processing can be performed according to the abnormality content of overcharge and overdischarge.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 1 is an overall configuration diagram of a vehicle equipped with a battery pack charge / discharge control device according to a first embodiment of the present invention. In the following embodiment, an example in which the assembled battery is applied as a power source of a hybrid electric vehicle will be described. In FIG. 1, a battery pack 1 is configured by connecting n unit cells 11 to 1n in series. The charge / discharge control device includes current bypass circuits 21 to 2n, abnormality detection circuits 31 to 3n, an OR circuit 4, a charge / discharge control circuit 5, and an inverter / converter 6.
[0008]
The battery pack 1 supplies a current to the inverter / converter 6 at the time of discharging. The inverter / converter 6 controls output to the motor 7 according to a command from the charge / discharge control circuit 5. The motor 7 drives the wheels 10. By controlling the output by the inverter / converter 6, the load current of the battery pack 1 is controlled. The battery pack 1 is charged with a current supplied from the inverter / converter 6 during charging. The inverter / converter 6 controls a charging current to the battery pack 1 according to a command from the charge / discharge control circuit 5. The generator 8 is driven by the gasoline engine 9 and supplies the generated power to the inverter / converter 6.
[0009]
The charge / discharge control circuit 5 calculates a charge current value and a discharge current (load current) value for the battery pack 1 using voltage data of the battery pack 1 detected by a voltage detection circuit (not shown), and calculates the charge current and the discharge current. A charge control value and a discharge control value for obtaining a current are output to inverter / converter 6. Note that the actual control value during the running of the vehicle is calculated using detection values of various sensors (not shown) such as an accelerator operation amount sensor and a brake operation amount sensor, in addition to the voltage data.
[0010]
In the cells 11 to 1n, current bypass circuits 21 to 2n are provided in parallel with the respective cells. The current bypass circuits 21 to 2n respectively detect the terminal voltages of the unit cells connected in parallel, and when the detected voltage at the time of charging the battery pack 1 reaches the first determination threshold lower than the charge termination voltage by a predetermined value, The charging current of the cell is bypassed to the current bypass circuit. As a result, the charging current to the unit cell decreases, and the speed at which the unit cell reaches a fully charged state, that is, a state where the depth of discharge (DOD) reaches 0%, is reduced. The charge end voltage is a terminal voltage corresponding to DOD 0% of the unit cell.
[0011]
The unit cells 11 to 1n are further provided with abnormality detection circuits 31 to 3n in parallel with the unit cells. The abnormality detection circuits 31 to 3n respectively detect the terminal voltages of the unit cells connected in parallel, and set the detection voltages at the time of charging and discharging of the battery pack 1 to a second determination threshold lower than the charge termination voltage by a predetermined value. When the detected voltage reaches the third threshold value or when the detected voltage reaches a third determination threshold value higher than the discharge end voltage by a predetermined value, an abnormality detection signal is output to the OR circuit 4. The discharge end voltage is a terminal voltage corresponding to a state where the unit cell is fully discharged, that is, a DOD of 100%. The above-mentioned determination threshold value has a relationship of second determination threshold value> first determination threshold value> third determination threshold value.
[0012]
The OR circuit 4 calculates the logical sum of the abnormality detection signals output from the abnormality detection circuits 31 to 3n, and outputs the operation result to the charge / discharge control circuit 5. Thus, when any of the abnormality detection circuits 31 to 3n detects an abnormality, the charge / discharge control circuit 5 is notified of the abnormality.
[0013]
According to the present invention, when an abnormality is detected in any of the abnormality detection circuits 31 to 3n included in the charge / discharge control device, the content of the abnormality is determined, and different processing is performed in accordance with the content of the determination.
[0014]
In the above description, each of the current bypass circuits 21 to 2n and the abnormality detection circuits 31 to 3n detects the voltage of each cell. However, the current bypass circuits 21 to 2n and the abnormality detection circuits 31 to 3n each include one set of voltage detection circuits for detecting the terminal voltage of each cell. A configuration may be adopted in which the detection values obtained by the voltage detection circuits are used in both the current bypass circuits 21 to 2n and the abnormality detection circuits 31 to 3n. For example, the abnormality detection circuits 31 to 3n are provided with single cell voltage detection circuits, and the abnormality detection circuits 31 to 3n themselves and the current bypass circuits 21 to 2n use the voltage detection values of the abnormality detection circuits 31 to 3n.
[0015]
FIG. 2 is a flowchart illustrating the flow of the charge / discharge control process of the battery pack 1 performed by the charge / discharge control circuit 5. The process shown in FIG. 2 is repeatedly performed when a power switch (not shown) of the charge / discharge control device is turned on. In step S1 in FIG. 2, the charge / discharge control circuit 5 determines whether or not a cell is abnormal. The charge / discharge control circuit 5 makes an affirmative decision in step S1 when an abnormality is reported from the OR circuit 4 and proceeds to step S2, and makes a negative decision in step S1 when no abnormality is reported from the OR circuit 4; The process according to FIG. 2 ends.
[0016]
In step S2, the charge / discharge control circuit 5 determines whether or not the charging control of the battery pack 1 is being performed. When the battery pack 1 is being charged, the charge / discharge control circuit 5 makes an affirmative determination in step S2 and proceeds to step S3, and when it is not charging, makes a negative determination in step S2 and proceeds to step S4. In step S3, the charge / discharge control circuit 5 determines that the abnormality detection signal is an overcharge abnormality, and proceeds to step S5. The overcharge abnormality is when any one of the terminal voltages of the cells 11 to 1n is equal to or higher than the second determination threshold. In step S5, the charge / discharge control circuit 5 performs a predetermined abnormality avoiding process based on the overcharge abnormality, and ends the process in FIG. The abnormality avoiding process in this case may be any control process for reducing the amount of charge such as reducing the charging current or prohibiting charging.
[0017]
When proceeding to step S4, when the battery pack 1 is under discharge control (during discharge), when the power switch of the charge / discharge control device is turned on (at startup), and neither charging nor discharging of the battery pack 1 is performed. Including time. In step S4, the charge / discharge control circuit 5 determines that the abnormality detection signal is an overdischarge abnormality, and proceeds to step S6. The overdischarge abnormality is a case where the terminal voltage of any of the cells 11 to 1n has become equal to or less than the third determination threshold. In step S6, the charge / discharge control circuit 5 performs a predetermined abnormality avoiding process based on the overdischarge abnormality, and ends the process in FIG. The abnormality avoiding process in this case may be a control process in the direction of reducing the discharge amount such as reducing the discharge current or inhibiting the discharge.
[0018]
The first embodiment described above will be summarized.
(1) The charge / discharge control device includes the current bypass circuits 21 to 2n, and during charging of the battery pack 1, the terminal voltage of any of the cells 11 to 1n reaches a first determination threshold lower than the charge end voltage by a predetermined value. Then, the charging current of the cell is bypassed. Therefore, the charging current of the cell that has approached full charge (DOD 0%) earlier than the other cells decreases, and the speed at which the cell reaches a fully charged state becomes slower. The difference in DOD between the cells can be reduced, and variations in DOD between cells can be suppressed. As a result, a decrease in the discharge capacity of the battery pack 1 can be prevented. The variation in the DOD is caused by a difference in characteristics between the cells that occur during the manufacture of the cells, a difference in the temperature environment between the cells being used as the assembled battery 1, and the like.
[0019]
(2) The charge / discharge control device includes abnormality detection circuits 31 to 3n, and a second determination threshold value in which the terminal voltage of any of the cells 11 to 1n is lower than the charge end voltage by a predetermined value when the battery pack 1 is charged and discharged. , Or when it reaches a third determination threshold higher by a predetermined value than the discharge end voltage, an abnormality detection signal is output. Therefore, it is possible to detect that one of the cells is approaching full charge or approaching full discharge (DOD 0%). In addition, the determination threshold value is set as a second determination threshold value> a first determination threshold value> a third determination threshold value.
[0020]
(3) When an abnormality is detected by the abnormality detection circuits 31 to 3n, the charge / discharge control circuit 5 separates the overcharge abnormality from the overdischarge abnormality depending on whether the battery pack 1 is under charge control. It is possible to take a measure according to the content of the abnormality.
[0021]
(Second embodiment)
The charge / discharge control process shown in FIG. 3 may be performed instead of the process shown in FIG. Here, the same steps as those in the processing in FIG. 2 are denoted by the same step numbers as those in FIG. In step S11, to which the operation proceeds after making an affirmative determination in step S2 in FIG. 3, the charge / discharge control circuit 5 switches from charge control to discharge control, and proceeds to step S12. In step S12, the charge / discharge control circuit 5 determines whether or not the cell abnormality continues. The charge / discharge control circuit 5 makes an affirmative determination in step S12 when the abnormality notification is continued from the OR circuit 4, proceeds to step S15, and makes a negative determination in step S12 when the abnormality notification is not continued from the OR circuit 4. Then, the process proceeds to step S16.
[0022]
In step S15, the charge / discharge control circuit 5 determines that the abnormality detection signal is an overdischarge abnormality, and proceeds to step S6. In step S6, the charge / discharge control circuit 5 performs a predetermined abnormality avoiding process based on the overdischarge abnormality, and ends the process in FIG.
[0023]
In step S13, to which the operation proceeds after making a negative determination in step S2, the charge / discharge control circuit 5 switches to charging control (starts charging) and proceeds to step S14. In step S14, the charge / discharge control circuit 5 determines whether or not the cell abnormality continues. The charge / discharge control circuit 5 makes an affirmative decision in step S14 when abnormality notification is continued from the OR circuit 4 and proceeds to step S16, and makes a negative decision in step S14 when abnormality notification is not continued from the OR circuit 4 Then, the process proceeds to step S15.
[0024]
In step S16, the charge / discharge control circuit 5 determines that the abnormality detection signal is an overcharge abnormality, and proceeds to step S5. In step S5, the charge / discharge control circuit 5 performs a predetermined abnormality avoiding process based on the overcharge abnormality, and ends the process in FIG.
[0025]
According to the second embodiment described above, the overcharge abnormality and the overdischarge abnormality are distinguished based on whether or not the abnormality is continued even if the charge / discharge control is switched. Therefore, the first embodiment Similarly to the above, it becomes possible to take a measure corresponding to the abnormality.
[0026]
(Third embodiment)
The charge / discharge control process shown in FIG. 4 may be performed instead of the process shown in FIG. Here, the same steps as those in the processing in FIG. 2 are denoted by the same step numbers as those in FIG. In step S21 of FIG. 4, the charge / discharge control circuit 5 outputs a command to reduce the amount of charge to the inverter / converter 6, and then proceeds to step S22. Thereby, the inverter converter 6 reduces the charging current. In step S22, the charge / discharge control circuit 5 determines whether or not the cell abnormality continues. The charge / discharge control circuit 5 makes an affirmative decision in step S22 when abnormality notification is continued from the OR circuit 4 and proceeds to step S23, and makes a negative decision in step S22 when abnormality notification is not continued from the OR circuit 4 Then, the processing in FIG. 4 ends. In step S23, the charge / discharge control circuit 5 outputs a command to prohibit charging to the inverter / converter 6, and ends the processing in FIG. This causes the inverter / converter 6 to stop charging the battery pack 1 (set the charging current to 0).
[0027]
In step S24 of FIG. 4, the charge / discharge control circuit 5 outputs a command to reduce the amount of discharge to the inverter / converter 6, and proceeds to step S25. Thus, inverter / converter 6 reduces the load current. In step S25, the charge / discharge control circuit 5 determines whether or not the cell abnormality continues. The charge / discharge control circuit 5 makes an affirmative determination in step S25 when the abnormality notification is continued from the OR circuit 4 and proceeds to step S26, and makes a negative determination in step S25 when the abnormality notification is not continued from the OR circuit 4. Then, the processing in FIG. 4 ends. In step S26, the charge / discharge control circuit 5 outputs a command to prohibit discharge to the inverter / converter 6, and terminates the processing in FIG. As a result, the inverter / converter 6 stops discharging the battery pack 1 (sets the load current to 0).
[0028]
According to the third embodiment described above, the overcharge abnormality and the overdischarge abnormality are separated depending on whether or not the charge control of the battery pack 1 is being performed. The charge was prohibited or the discharge was prohibited depending on whether the abnormality was continued or not. As a result, appropriate measures can be taken according to the abnormality.
[0029]
(Fourth embodiment)
In the fourth embodiment, when it is determined that there is an overcharge abnormality or an overdischarge abnormality, charging or discharging is inhibited in accordance with the total voltage of the battery pack 1, respectively. FIG. 5 is an overall configuration diagram of a vehicle equipped with a battery pack charge / discharge control device according to a fourth embodiment of the present invention. 5, the same components as those in FIG. 1 are denoted by the same reference numerals as those in FIG. 1, and description thereof is omitted. The total voltage detection circuit 50 is configured to detect the total voltage of the battery pack 1 and output a detection signal to the charge / discharge control circuit 5A. The total voltage is a terminal voltage of the battery pack 1.
[0030]
FIG. 6 is a flowchart illustrating the flow of the charge / discharge control process according to the fourth embodiment. Here, the same steps as those in the processing in FIG. 4 are denoted by the same step numbers as in FIG. 4, and description thereof is omitted. In step S31 of FIG. 6, the charge / discharge control circuit 5A determines whether the total voltage is equal to or greater than a fourth determination threshold V4. The determination threshold value V4 is a voltage value that is lower than the total charging end voltage by a predetermined value. When the voltage value based on the detection signal sent from the total voltage detection circuit 50 is equal to or greater than the fourth determination threshold value V4, the charge / discharge control circuit 5A makes an affirmative determination in step S31, advances to step S32, and proceeds to step S32. If it is less than the determination threshold V4, a negative determination is made in step S31, and the processing in FIG. 6 ends.
[0031]
In step S32, the charge / discharge control circuit 5A outputs a command to prohibit charging to the inverter / converter 6, and ends the processing in FIG. Thus, the inverter / converter 6 stops charging the battery pack 1.
[0032]
In step S33, the charge / discharge control circuit 5A determines whether or not the total voltage is equal to or less than a fifth determination threshold V5. The determination threshold value V5 is a voltage value that is higher than the total discharge end voltage by a predetermined value. When the voltage value based on the detection signal sent from the total voltage detection circuit 50 is equal to or smaller than the fifth determination threshold value V5, the charge / discharge control circuit 5A makes an affirmative determination in step S33, proceeds to step S34, and proceeds to step S34. If it exceeds the determination threshold value V5, a negative determination is made in step S33, and the processing in FIG. 6 ends.
[0033]
In step S34, the charge / discharge control circuit 5A outputs a command to prohibit discharge to the inverter / converter 6, and ends the processing in FIG. As a result, the inverter / converter 6 stops discharging the battery pack 1.
[0034]
According to the fourth embodiment described above, the overcharge abnormality and the overdischarge abnormality are separated based on whether or not the charging control of the battery pack 1 is being performed, and after the separation, the total voltage is detected, respectively. Is prohibited when the value is equal to or more than the fourth determination threshold, and is prohibited when the overdischarge is abnormal and the total voltage is equal to or less than the fifth determination threshold. As a result, appropriate measures can be taken according to the abnormality.
[0035]
(Fifth embodiment)
In the fifth embodiment, the amount of charge or the amount of discharge is reduced according to the content of a cell abnormality determined in the past, that is, an overdischarge abnormality or an overcharge abnormality. FIG. 7 is a flowchart illustrating a flow of a charge / discharge control process according to the fifth embodiment. 7 is inserted before step S1 in each of the charge / discharge control processes according to the above-described first to fourth embodiments.
[0036]
In step S41 of FIG. 7, the charge / discharge control circuit 5 (5A) determines whether or not there has been a cell abnormality experience in the past. The charge / discharge control circuit 5 (5A) makes an affirmative determination in step S41 when the user has experience in determining a cell abnormality and proceeds to step S42, and makes a negative determination in step S41 when there is no experience in determining a cell abnormality. 7 is terminated. When the processing according to FIG. 7 ends, the process proceeds to step S2 of the above-described charge / discharge control processing.
[0037]
In step S42, the charge / discharge control circuit 5 (5A) determines a past abnormal mode. The charge / discharge control circuit 5 (5A) proceeds to step S43 when it is determined that there is an overcharge abnormality in the past, and proceeds to step S44 when it is determined that the overdischarge is abnormal in the past. In step S43, the charge / discharge control circuit 5 (5A) terminates the processing in FIG. 7 so as to reduce the charge amount during the charge control of the battery pack 1. In step S44, the charge / discharge control circuit 5 (5A) ends the processing in FIG. 7 so as to reduce the amount of discharge during the discharge control of the battery pack 1.
[0038]
According to the fifth embodiment described above, the charge amount at the time of charge control is narrowed in the past when there is experience in determining an overcharge abnormality, and the discharge amount in the discharge control when there is experience in the determination of an overdischarge abnormality. Each of the charge / discharge control processes according to any of the first to fourth embodiments is performed after narrowing down, so that it is possible to appropriately deal with abnormalities occurring in the past and newly occurring abnormalities. Measures can be taken.
[0039]
Correspondence between each component in the claims and each component in the embodiment of the invention will be described. The assembled battery includes, for example, the cells 11 to 1n. The charge / discharge control unit, the charge determination unit, the determination unit, and the abnormality processing unit are configured by, for example, a charge / discharge control circuit 5 (5A). The voltage detection means and the abnormality detection means are constituted by, for example, abnormality detection circuits 31 to 3n. The first voltage value corresponds to, for example, a second determination threshold value. The second voltage value corresponds to, for example, a third determination threshold. The first total voltage value corresponds to, for example, a fourth determination threshold value. For example, a fifth determination threshold value corresponds to the second total voltage value. Note that each component is not limited to the above configuration as long as the characteristic functions of the present invention are not impaired.
[Brief description of the drawings]
FIG. 1 is an overall configuration diagram of a vehicle equipped with a battery pack charge / discharge control device according to a first embodiment of the present invention.
FIG. 2 is a flowchart illustrating a flow of a battery pack charge / discharge control process performed by a charge / discharge control circuit.
FIG. 3 is a flowchart illustrating a flow of a battery pack charge / discharge control process according to a second embodiment.
FIG. 4 is a flowchart illustrating a flow of a battery pack charge / discharge control process according to a third embodiment.
FIG. 5 is an overall configuration diagram of a vehicle equipped with a battery pack charge / discharge control device according to a fourth embodiment of the present invention.
FIG. 6 is a flowchart illustrating a flow of a battery pack charge / discharge control process according to a fourth embodiment.
FIG. 7 is a flowchart illustrating a flow of a battery pack charge / discharge control process according to a fifth embodiment.
[Explanation of symbols]
1 ... assembled battery, 4 ... OR circuit,
5, 5A: charge / discharge control circuit, 6: inverter / converter,
11-1n ... cell, 21-2n ... current bypass circuit,
31 to 3n: abnormality detection circuit, 50: total voltage detection circuit

Claims (10)

Charge / discharge control means for controlling charging and discharging of an assembled battery composed of a plurality of cells,
Voltage detection means for detecting the voltage of the cell,
Charge determination means for determining whether the battery pack is charging,
Abnormality detection means for outputting an abnormality detection signal when the detection voltage is higher than a first voltage value and when the detection voltage is lower than a second voltage value lower than the first voltage value;
If the abnormality detection signal is output while the charging determination unit is determining that charging is being performed, it is determined that overcharging is abnormal, and if the charging determination unit is not determining that charging is being performed, the abnormality detection signal is output. Determining means for determining that an overdischarge abnormality has occurred;
A charge / discharge control device for an assembled battery, comprising: an abnormality processing unit that instructs the charge / discharge control unit to perform a predetermined process in accordance with a result of the determination by the determination unit. The charge / discharge control device for an assembled battery according to claim 1,
The time when the charge judging means does not judge that the battery is being charged means when the charge / discharge control device is started, when the battery pack is discharging, and when the battery pack is neither charging nor discharging. And a controller for controlling the charge and discharge of the battery pack. The charge / discharge control device for an assembled battery according to claim 1 or 2,
The determination means instructs the charge / discharge control means to switch from charge to discharge when the abnormality detection signal is output while the charge determination means determines that charging is being performed, and after the switch instruction to discharge, If the abnormality detection signal is continuously output, it is determined that the battery is overdischarged.If the abnormality detection signal is not output after the instruction to switch to the discharge, the battery is determined to be overcharged. Charge and discharge control device. The charge / discharge control device for an assembled battery according to claim 1,
The determining means instructs the charge / discharge control means to start charging when the abnormality detection signal is output when the charging determining means does not determine that charging is in progress, and after the switching instruction to charge, When the abnormality detection signal is continuously output, the overcharge abnormality is determined, and when the abnormality detection signal is not output after the instruction to switch to the charge, the overdischarge abnormality is determined. Charge and discharge control device. The charge / discharge control device for an assembled battery according to any one of claims 1 to 4,
The abnormality processing means, when the overcharge abnormality is determined by the determination means, instructs the charge / discharge control means to reduce the charge amount, and when the abnormality detection signal is continuously output after the instruction, A charge / discharge control device for a battery pack, further comprising a command to prohibit charging to the charge / discharge control means. The charge / discharge control device for an assembled battery according to any one of claims 1 to 5,
The abnormality processing unit, when the overdischarge abnormality is determined by the determination unit, instructs the charge / discharge control unit to reduce the discharge amount, and when the abnormality detection signal is continuously output after the instruction, A charge / discharge control device for an assembled battery, wherein the charge / discharge control unit is further instructed to prohibit discharge. The charge / discharge control device for an assembled battery according to any one of claims 1 to 4,
Further comprising a total voltage detecting means for detecting the voltage of the battery pack,
The abnormality processing unit instructs the charge / discharge control unit to prohibit charging when the overcharge abnormality is determined by the determination unit and the voltage detected by the total voltage detection unit is higher than a first total voltage value. A charge / discharge control device for an assembled battery, comprising: The charge / discharge control device for an assembled battery according to any one of claims 1 to 4, and 7,
Further comprising a total voltage detecting means for detecting the voltage of the battery pack,
The abnormality processing unit is configured to perform the charging when the overdischarge abnormality is determined by the determination unit and the voltage detected by the total voltage detection unit is lower than a second total voltage value lower than the first total voltage value. A charge / discharge control device for a battery pack, wherein a discharge prohibition is instructed to a discharge control means. The charge / discharge control device for an assembled battery according to any one of claims 1 to 8,
The abnormality processing unit instructs the charge / discharge control unit to reduce the charge amount regardless of the presence or absence of the abnormality detection signal after the overcharge abnormality is determined by the determination unit, and the overcharge abnormality is determined by the determination unit. A charge / discharge control device for an assembled battery, wherein the charge / discharge control unit is instructed to reduce the amount of discharge regardless of the presence or absence of the abnormality detection signal after a discharge abnormality is determined. In a charge / discharge control method for controlling charging and discharging of a battery pack including a plurality of cells,
Detecting the voltage of the cell,
Determine whether the battery pack is charging,
When the detected voltage is higher than a first voltage value, and when the detected voltage is lower than a second voltage value lower than the first voltage value, it is regarded as abnormal, respectively.
When the battery pack is being charged, it is determined that the battery is overcharged, and when the battery is not charged, it is determined that the battery is overcharged.
A charge / discharge control method for an assembled battery, wherein a predetermined process is instructed according to the determination result.

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