WO2013179810A1

WO2013179810A1 - Device for controlling battery pack, power source device, and method for controlling battery pack

Info

Publication number: WO2013179810A1
Application number: PCT/JP2013/061710
Authority: WO
Inventors: 耕平本蔵
Original assignee: 株式会社日立製作所
Priority date: 2012-05-29
Filing date: 2013-04-22
Publication date: 2013-12-05
Also published as: JP2013246109A; JP5919093B2

Abstract

Provided is a means for determining, by a simple method, a degradation state for each cell group having the same characteristics in order to appropriately control a battery pack configured by combining a plurality of secondary cells having different characteristics. A device for controlling a battery pack configured by connecting chargeable/dischargeable first secondary cells having a first characteristic and chargeable/dischargeable second secondary cells having a second characteristic, wherein the device for controlling a battery pack is provided with: a memory unit for storing the first characteristic and the number of first secondary cells, and the second characteristic and the number of second secondary cells; and a voltmeter for detecting the voltage of the battery pack; a control unit for sensing a voltage variation rate or capacitance variation rate on the basis of the output of the voltmeter; and the degradation rate of the first secondary cells and the degradation rate of the second secondary cells are determined in the control unit on the basis of the voltage variation rate and the capacitance variation rate, the first characteristic and the number of first secondary cells, and the second characteristic and the number of second secondary cells.

Description

Battery pack control device, power supply device, battery pack control method

The present invention relates to an assembled battery control device, a power supply device, and an assembled battery control method.

A battery pack composed of a secondary battery such as a lithium ion battery connected in series or in parallel is mounted on a vehicle such as a hybrid car as a power source for obtaining high output or high capacity. It is expected to be applied to applications such as power supplies for electric power storage and power supplies for smart houses. As one form of the assembled battery, a battery constructed by combining two types of secondary batteries having different characteristics from each other is known. In such an assembled battery, it is possible to give the assembled battery characteristics different from those of an assembled battery constructed with only a single type of secondary battery.

Also, since the unit price of the secondary battery is high at present, the reuse of the secondary battery is also being considered. For example, there is a utilization technique such as forming an assembled battery by combining single cells whose life as a vehicle traveling battery has been completed, and using it as a power storage power source at home. Such an assembled battery may be composed of a plurality of battery types having different battery characteristics due to different deterioration states and specifications.

In this case, if the control method of the assembled battery is not appropriate, the deterioration of a specific battery type proceeds faster than other battery types, and the life of the assembled battery is shortened. For this reason, in order to appropriately control the assembled battery, it is desirable to measure the battery voltage and capacity for each cell or for each battery group having the same battery characteristics. However, when a large number of voltage measuring circuits and current measuring circuits are attached, there is a problem that the price of the assembled battery increases.

As a method for determining the state of the assembled battery, for example, in Patent Document 1, a battery group A in which a plurality of secondary batteries are connected in series and a battery group B in which a plurality of secondary batteries are connected in parallel are connected in series. A method for detecting the charge / discharge state of the battery group A from the voltage B is described.

JP 2011-086530 A

The above-mentioned Patent Document 1 is effective for detecting the charge / discharge state of a battery having a small voltage change rate. For this reason, since a plurality of secondary batteries are used as the battery group B, the price of the assembled battery as a whole increases. . In addition, there is a problem that the deterioration state of the battery group A cannot be detected.

The present invention has been made in view of such problems, and in an assembled battery configured by combining a plurality of secondary batteries having different characteristics, the deterioration state is determined for each battery group having the same characteristics by a simple method. It is an object of the present invention to provide means for extending the life of an assembled battery by means or control based on a determination result.

Features for solving the above problems are as follows, for example.
A chargeable / dischargeable first secondary battery having a first characteristic and a chargeable / dischargeable second secondary battery having a second characteristic different from the first characteristic are connected in series or in parallel. A storage unit configured to store a first characteristic, the number of first secondary batteries, the second characteristic, and the number of second secondary batteries included in the assembled battery And a voltmeter that detects the voltage of the battery pack, and a voltage change rate as a voltage difference with respect to the battery battery capacity difference or a capacity change rate as a battery battery voltage difference based on the output of the voltmeter. A control unit that performs voltage change rate or capacity change rate, the first characteristic and the number of first secondary batteries, the second characteristic and the number of second secondary batteries, The deterioration rate of the first secondary battery and the deterioration rate of the second secondary battery based on Control of the assembled battery to be constant.

In the above, the storage unit holds the deterioration rate of the first secondary battery, the deterioration rate of the second secondary battery, and the determination date / time determined at two or more different dates / times. The remaining life of the first secondary battery and the remaining life of the second secondary battery are determined based on the deterioration rate of the secondary battery, the deterioration rate of the second secondary battery, and the determination date and time. A control apparatus for an assembled battery that outputs a detection signal when the remaining life of one secondary battery and the remaining life of a second secondary battery are smaller than a predetermined value.

In the above, the control unit performs overcharge regions or overdischarges of the first secondary battery and the second secondary battery based on the deterioration rate of the first secondary battery and the deterioration rate of the second secondary battery. A control device that determines a voltage region or a capacity region of an assembled battery corresponding to the region, and outputs a detection signal when the voltage or the capacity of the assembled battery is included in the voltage region or the capacity region.

In the above, the control unit performs overcharge regions or overdischarges of the first secondary battery and the second secondary battery based on the deterioration rate of the first secondary battery and the deterioration rate of the second secondary battery. A voltage range or a capacity region of the assembled battery corresponding to the region is determined, and when the voltage or the capacity of the assembled battery is included in the voltage region or the capacity region, the first secondary battery and the second secondary battery are Control device that outputs detection signals individually.

In the above, it has a switch which connected the positive electrodes of the 1st secondary battery and the 2nd secondary battery, and the negative electrodes, the opening and closing of a switch is controlled by the control part, and a control part is a switch based on a detection signal. And controlling the voltage of the first secondary battery and the second secondary battery so that both the first secondary battery and the second secondary battery are not included in the overcharge region or the overdischarge region. A control device that equalizes the voltage of the secondary battery.

In the above, the first secondary battery and the second secondary battery flow through the switch connecting the positive electrodes and the negative electrodes of the second secondary battery, and the first secondary battery and the second secondary battery disposed in the vicinity of the switch. An ammeter that detects current, and the control unit controls opening and closing of the switch. The control unit controls opening and closing of the switch based on the detection signal, and the current value of the first secondary battery or the first The control apparatus which interrupts | blocks the electric current value of 2 secondary batteries.

A power supply device having the above control device and an assembled battery.

A chargeable / dischargeable first secondary battery having a first characteristic and a chargeable / dischargeable second secondary battery having a second characteristic different from the first characteristic are connected in series or in parallel. The assembled battery control method is configured to store the first characteristic, the number of first secondary batteries, the second characteristic, and the number of second secondary batteries included in the assembled battery by the storage unit. A step of detecting the voltage of the assembled battery with a voltmeter, and a voltage change rate as a voltage difference with respect to the capacity difference of the assembled battery or a capacity with respect to the voltage difference of the assembled battery based on the output of the voltmeter by the control unit In the step of detecting the capacity change rate as a difference, and in the control unit, the voltage change rate or the capacity change rate, the first characteristic and the number of first secondary batteries, the second characteristic and the second secondary Degradation of the first secondary battery based on the number of batteries And the control method of an assembled battery and determining a deterioration rate of the second secondary battery, a.

According to the present invention, when the assembled battery is composed of two or more types of secondary batteries having different characteristics, means for determining a deterioration state for each battery group having the same characteristics by a simple method, or a determination result Thus, it is possible to provide means for extending the life of the assembled battery by the control based on the above. Problems, configurations, and effects other than those described above will be clarified by the following description of embodiments.

An example of embodiment concerning this invention. The schematic diagram which shows the principle which determines the deterioration state of a battery. The flowchart which calculates | requires the deterioration rate and capacity | capacitance deviation of an assembled battery. An example of the capacity | capacitance change of each battery group in an assembled battery. An example of embodiment concerning this invention. An example of the discharge curve of the assembled battery which deteriorated.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The following description shows specific examples of the contents of the present invention, and the present invention is not limited to these descriptions. Various modifications by those skilled in the art are within the scope of the technical idea disclosed in this specification. Changes and modifications are possible. In all the drawings for explaining the present invention, components having the same function are denoted by the same reference numerals, and repeated description thereof may be omitted.

FIG. 1 shows an example of an embodiment of a power supply device provided with a control device for an assembled battery according to the present invention. Hereinafter, a lithium ion secondary battery will be described as a secondary battery, but the present invention is not limited to this.

The control device 1100 includes an ammeter 10, a voltmeter 11, a control unit 100, a memory 110, and an output unit 120. The assembled battery 1000 of this embodiment includes a battery group AA in which N batteries A (first secondary batteries), which are secondary batteries having a first characteristic, are connected in series, and two batteries having a second characteristic. A battery group BB in which M batteries B (secondary secondary batteries) which are secondary batteries are connected in series is connected in series. Battery A and battery B have different characteristics. An ammeter 10 that detects current flowing through the assembled battery 1000 is connected in series with the assembled battery 1000. A voltmeter 11 for detecting the voltage of the assembled battery 1000 is connected in parallel with the assembled battery 1000. For example, when two batteries are compared, a plurality of types of batteries whose charge / discharge curves do not overlap when the horizontal axis indicates SOC and the vertical axis indicates voltage are not limited thereto. . As can be seen from FIG. 2, battery A includes an active material that does not change phase due to charging / discharging of the lithium ion secondary battery, and battery B includes an active material that changes phase due to charging / discharging of the lithium ion secondary battery. ing.

Based on the outputs of the voltmeter 11 and the ammeter 10, a control unit 100 is provided that calculates the voltage change rate (VvsdQ / dV) with respect to the capacity change of the assembled battery 1000 or the capacity change rate (QvsdV / dQ) with respect to the voltage change Yes. A memory 110 (storage unit) is disposed in the vicinity of the control unit 100, and the memory 110 holds the number and characteristics of each of the battery types constituting the assembled battery 1000. Based on the information held in the memory 110 and the voltage change rate or capacity change rate of the assembled battery 1000, the control unit 100 determines the deterioration rate of each battery type constituting the assembled battery 1000, and the output unit 120 determines the result. Is output to an external circuit, an external device, or the like.

The relationship between the capacity QA of the battery A and the voltage change rate V′A at the time of configuring the assembled battery 1000 is measured in advance. For example, n data groups (QA1, V′A1), (QA2, V′A2), ... (QAn, V′An) are held in the memory 110. Similarly, the relationship between the capacity QB of the battery B and the voltage change rate V′B at the time when the assembled battery 1000 is configured is measured in advance. For example, m data groups (QB1, V′B1), (QB2, V ′ B2), ..., (QBm, V'Bm) are held in the memory 110. At this time, the number of data groups n and m is at least 2 or more, preferably 20 or more, and more preferably 50 or more.

The memory 110 holds the deterioration rates of the battery group AA and the battery group BB. The definition of the deterioration rate can be arbitrarily determined, but here, the ratio between the full charge capacity W0 of the battery when the assembled battery 1000 is configured and the full charge capacity W of the battery when a certain time has elapsed. The deterioration rate R is defined by (W / W0). Moreover, it is desirable that the memory 110 adds and holds the combination of the measurement date and time and the deterioration rate to the stored data every time the deterioration rates of the battery groups AA and BB are measured.

FIG. 2 is a schematic diagram showing the principle of determining the deterioration state of the battery. For simplicity, a case where one battery A and one battery B are connected in series is shown. A solid line, a broken line, and a dotted line indicate the relationship between the capacity of the assembled battery 1000, the battery A, and the battery B and the voltage change rate, respectively. The capacity of the battery A is 0.60 Ah, and the capacity of the battery B is 0.69 Ah. When the assembled battery 1000 is configured, the deterioration rates RA and RB of the battery A and the battery B are 1 respectively. At this time, the capacity QAB of the assembled battery 1000 can be expressed as QAB = QA + ΔA = QB + ΔB, where ΔA and ΔB are constants indicating capacity deviation. Further, the voltage change rate V′AB in the capacity QAB of the assembled battery 1000 can be expressed as V′AB = V′A + V′B using the voltage change rates of the battery A and the battery B. On the other hand, when the deterioration rates of the battery A and the battery B are RA and RB, respectively, the capacity QAB of the assembled battery 1000 can be expressed as in (Equation 1) below. When the capacity deviation is not taken into consideration, ΔA = ΔB = 0 in (Equation 1), and the deterioration rate can be obtained ignoring the capacity deviation.

[Formula 1]
QAB = RA × QA + ΔA = RB × QB + ΔB (Formula 1)
Further, the voltage change rate V′AB in the capacity QAB of the assembled battery 1000 can be expressed as the following (Formula 2).

[Formula 2]
V′AB = V′A / RA + V′B / RB (Formula 2)
Using the above expression, based on the relationship between the capacity and voltage change rate of the batteries A and B when the assembled battery 1000 is configured, the deterioration rate is calculated from the relationship between the capacity QAB of the assembled battery 1000 and the voltage change rate V′AB. RA and RB and capacity deviations ΔA and ΔB can be obtained. By considering the capacity deviations ΔA and ΔB, the capacity can be adjusted for each battery group. For example, when only the battery A is charged in order to suppress the deterioration of the battery B, the capacity (and voltage) of the battery A alone increases, so that the battery pack capacity, the capacity of the battery A, and the capacity of the battery B Deviation occurs. By introducing capacity deviations ΔA and ΔB as parameters representing this deviation, the capacity can be adjusted for each battery group.

FIG. 3 shows an example of a flowchart for obtaining the deterioration rates RA and RB and the capacity deviations ΔA and ΔB from the relationship between the capacity QAB of the assembled battery 1000 and the voltage change rate V′AB.

First, in step 1, data groups (QAB1, V'AB1), (QAB2, V'AB2), ..., (QAB1, V'AB1) showing the relationship between the capacity QAB of the assembled battery 1000 and the voltage change rate V'AB. Is read. At this time, calculation is possible if the number l of data groups is twice or more the number of battery groups, here 4 or more, but 20 or more is desirable for accurate calculation, and 50 or more is more desirable. After reading the data group into the memory 110 in step 1, the process proceeds to step 2.

In step 2, the battery A data groups (QA1, V′A1), (QA2, V′A2),..., (QAn, V′An) and the battery B data groups (QB1, V ′) held in the memory 110 are stored. 'B1), (QB2, V'B2), ..., (QBm, V'Bm) are read. n is the number of batteries A in the battery group AA, and m is the number of batteries B in the battery group BB. Note that the order of step 1 and step 2 may be interchanged.

In step 3, the deterioration rates RA and RB of the batteries A and B and the values of capacity deviations ΔA and ΔB are set. As the initial set value, the value of the deterioration rate and the capacity shift at the most recent measurement time held in the memory 110 is desirable. However, any value can be used when such a value does not exist.

In step 4, the capacity of the assembled battery 1000 is calculated based on (Equation 1) and (Equation 2) using the deterioration rate values and capacity deviation values of the batteries A and B, and the data groups of the batteries A and B. A data group indicating the relationship between QAB and voltage change rate V′AB is formed. The capacity in this data group may be arbitrarily determined, but for example, the capacity in the data group read in step 1 can be used. The data group in this case is (QAB1, V'ABc1), (QAB2, V'ABc2), ..., (QAB1, V'ABcl), where V'ABc is the calculated voltage change rate of the assembled battery 1000. .

In step 5, the degree of coincidence between the data group of the assembled battery 1000 read in step 1 and the data group of the assembled battery 1000 configured in step 4 is confirmed. The confirmation method can be arbitrarily determined. For example, in both data groups, the square of the difference in voltage change rate corresponding to the same capacity QABi (V′ABi−V′ABci) ² is taken, and this is expressed as 1 to 1 If the value R ^{2 obtained} by summing up i is less than or equal to a certain value, a method that both data have a sufficient degree of coincidence, and that the value of R ² does not decrease even if the parameter value is changed. And the method of changing the parameter value by a fixed number of trials and selecting the condition with the smallest R ² among them. If it is determined that the degree of coincidence is not sufficient, the process returns to step 4 to set the values of the deterioration rates RA and RB and the capacity deviations ΔA and ΔB again. The resetting method can be arbitrarily determined.

In step 6, the deterioration rates RA and RB are output to the output unit 120. *

Through the above steps, the deterioration rate for each type of secondary battery can be determined by a simple method without providing a voltmeter or ammeter for determining the deterioration rate in each battery group.

The memory of the control device according to an embodiment of the present invention stores the combination of the measurement date / time t, the deterioration rate R, and the capacity deviation Δ in addition to the stored data every time the control unit measures the deterioration rate of the battery group. Can do. For example, in the assembled battery described in the first embodiment, the data group (t1, RA1, RB1, ΔA1, ΔB1), (t2, RA2, RB2, ΔA2, ΔB2), ..., (tn, RAn, RBn, ΔAn, ΔBn) ). With this data group, the remaining life can be estimated for each battery group constituting the assembled battery. The estimation method may be arbitrarily determined. For example, there are the following methods.

FIG. 4 shows the capacity change of the battery A and the battery B in the battery A and the battery B actually manufactured. The capacity of each battery was calculated by multiplying the capacities QAn and QBm at the time of construction of the assembled battery by the deterioration rates RA and RB. The decrease in capacity of each battery was almost proportional to the square root of the days used. Therefore, the remaining life of each battery can be predicted by regressing the relationship between the capacity and the square root of the number of days used in a straight line and extrapolating the number of days used. For example, when it is determined that the life of each battery is 0.5 Ah or less, the remaining life of battery A is (15 ² −8 ² ) = 161 days, and the remaining life of battery B from FIG. (12 ² −8 ² ) = 80 days. When the remaining life of each battery is smaller than a predetermined value, a detection signal indicating that the remaining life of each battery is smaller than a predetermined value is output to the output unit. For example, when the predetermined remaining life is 100 days, a detection signal for warning the remaining life of the battery B is output to an external circuit, an external device, or the like via the output unit.

According to the control device in one embodiment of the present invention, the charge / discharge curve of the battery group constituting the assembled battery 3000 is calculated from the charge / discharge curve indicating the relationship between the capacity of the assembled battery 3000 and the voltage change rate, and the result is Based on this, the charge / discharge states of the battery group AA and the battery group BB can be controlled. A configuration for this purpose is shown in FIG.

The positive electrodes of the battery group AA and the battery group BB are connected via the switch 1. Further, the negative electrodes of the battery group AA and the battery group BB are connected to each other via the switch 2 and an ammeter 30A arranged in the vicinity of the switch 2. The ammeter 30 </ b> A may be disposed in the vicinity of the switch 1. 30A of ammeters detect the electric current when forming a circuit only with battery group AA and battery group BB, ie, when equalizing a voltage by connecting the positive electrodes and negative electrodes of battery group AA and battery group BB. In this case, the current flowing out (flowing in) from the battery group AA is equal to the current flowing (flowing out) into the battery group BB.

Switch 3 is disposed between the negative electrode of battery group AA and the positive electrode of battery group BB. The switch 1, the switch 2, and the switch 3 are opened and closed according to instructions from the control unit 300. Normally, switch 1 and switch 2 are open and switch 3 is closed. The output of the ammeter 30B is sent to the control unit 300. A voltmeter 31 that detects the voltage of the assembled battery 3000 is connected in parallel with the assembled battery 3000. Similar to the first embodiment, a memory 310 is disposed in the vicinity of the control unit 300, and the memory 310 holds the number and characteristics of each of the battery types that the assembled battery 3000 constitutes. The control unit 300 determines the deterioration rate of each battery type constituting the assembled battery 3000 based on the information held in the memory 310 and the voltage change rate or the capacity change rate of the assembled battery 3000, and the output unit 320 determines the result. Is output to an external circuit, an external device, or the like.

According to such a configuration, for example, when only the battery group AA is overcharged or overdischarged, the detection signals are individually output to the battery group AA and the battery group BB. Accordingly, overcharge / overdischarge can be prevented by stopping the use of the battery immediately upon receiving the detection signal. Also, only the battery group BB can be charged / discharged by outputting a detection signal, closing the switch 1 and opening the switch 2 and switch 3. If only one battery group is overcharged or overdischarged and the voltage can be leveled with the other battery group, switch 1 and switch 2 are closed and switch 3 is opened. Thus, the voltages of the battery group AA and the battery group BB can be leveled so that both the battery group AA and the battery group BB are not included in the overcharge region or the overdischarge region. When leveling the voltages of the battery group AA and the battery group BB, it is necessary to detect the current flowing through the individual battery groups. In that case, an ammeter is not attached to each battery group, but an ammeter 30A is attached to the part of the switch 1 or the switch 2 to equalize the voltages of the battery group AA and the battery group BB. Can be detected and sent to the controller 300 to stop at a desired capacity (cut off the current value).

The discharge curves of the battery group AA and the battery group BB can be calculated as follows. The deterioration rates RA and RB and capacity deviations ΔA and ΔB obtained by the procedure of FIG. 3 and n data groups (QA1, V′A1), (QA2, V′A2) of the battery A held in the memory, ..., (QAn, V'An) and m data groups (QB1, V'B1), (QB2, V'B2), ..., (QBm, V'Bm) of battery B, New data group (RA × QA1 + ΔA, V′A1 / RA), (RA × QA2 + ΔA, V′A2 / RA),..., (RA × QAn + ΔA, V′An / RA) and a new data group for battery B (RB × QB1 + ΔB, V′B1 / RB), (RB × QB2 + ΔB, V′B2 / RB),... (RB × QBn + ΔB, V′Bn / RB), and the charge / discharge curve of the battery group constituting the assembled battery 3000 Can be calculated. FIG. 6 shows discharge curves of the assembled battery, battery A, and battery B when the capacity of battery A is 0.55 Ah and the capacity of battery B is 0.59 Ah. At this time, RA = 0.55 / 0.60 = 0.919, RB = 0.59 / 0.69 = 0.855, and ΔA = ΔB = 0. In FIG. 6, based on the deterioration rate of battery A and the deterioration rate of battery B, the voltage region or capacity region of the assembled battery corresponding to the overcharge region or overdischarge region of battery A and battery B is determined by the control unit. Yes.

For example, a procedure for preventing individual overdischarge of one battery group, that is, battery A or battery B will be described. For example, when the assembled battery shown in FIG. 6 is discharged by 0.55 Ah or more, the battery A falls into an overdischarged state. Therefore, when the discharge capacity reaches 0.55 Ah, the remaining capacity of the battery B is 0.04 Ah without overdischarge of the battery A by closing the switch 1, opening the switch 2, and opening the switch 3. Can be used. At this time, since a capacity shift occurs between the battery groups AA and BB, it is desirable to add −0.04 Ah to ΔB. The overcharge of one battery group can be prevented by the same procedure.

Next, the procedure for preventing overdischarge of the entire assembled battery will be described. When both the battery group AA and the battery group BB are simultaneously overdischarged, it is impossible to discharge only one battery group or charge the other battery group with one battery group. In this case, the controller 300 stops the discharge. When the output of the voltmeter 31 falls below a predetermined voltage (the sum of the lower limit voltages of the battery group AA and the battery group BB) or the discharge amount calculated from the output of the ammeter 30B is the remaining capacity (this embodiment) In the example, the discharge is stopped when exceeding 0.04 Ah). This prevents overdischarge of the entire assembled battery.

As described above, by operating the switches 1 to 3, the capacity deviations ΔA and ΔB are arbitrarily adjusted, and the discharge curves of the battery group A and the battery group B are combined to reconstruct the discharge curve of the assembled battery 3000. can do.

10, 30A,

30B Ammeter

11, 31

Voltmeter

100, 300

Control unit

110, 310

Memory

120, 320

Output unit

1000, 3000 Assembly battery 1100 Control device

Claims

A first chargeable / dischargeable secondary battery having a first characteristic;
A control device for an assembled battery configured by connecting a second chargeable / dischargeable secondary battery having a second characteristic different from the first characteristic, in series or in parallel,
A storage unit for storing the first characteristic and the number of the first secondary batteries and the second characteristic and the number of the second secondary batteries included in the assembled battery;
A voltmeter for detecting the voltage of the battery pack;
A controller that detects a voltage change rate as a voltage difference with respect to a capacity difference of the assembled battery based on an output of the voltmeter or a capacity change rate as a capacity difference with respect to the voltage difference of the assembled battery;
In the control unit, the voltage change rate or the capacity change rate, the number of the first characteristic and the first secondary battery, the number of the second characteristic and the second secondary battery, The battery pack control apparatus determines the deterioration rate of the first secondary battery and the deterioration rate of the second secondary battery based on the above.
In claim 1,
The storage unit holds the deterioration rate of the first secondary battery, the deterioration rate of the second secondary battery, and the determination date determined at two or more different dates and times,
The control unit determines the remaining life of the first secondary battery and the first life based on the deterioration rate of the first secondary battery, the deterioration rate of the second secondary battery, and the determination date and time. 2 determines the remaining life of the secondary battery,
An assembled battery control device that outputs a detection signal when the remaining life of the first secondary battery and the remaining life of the second secondary battery are smaller than a predetermined value.
In claim 1 or 2,
The control unit is configured to determine an overcharge region of the first secondary battery and the second secondary battery based on a deterioration rate of the first secondary battery and a deterioration rate of the second secondary battery. Determining the voltage region or capacity region of the battery pack corresponding to the overdischarge region;
A control device that outputs a detection signal when the voltage or capacity of the assembled battery is included in the voltage area or the capacity area.
In any one of Claims 1 thru | or 3,
The control unit is configured to determine an overcharge region of the first secondary battery and the second secondary battery based on a deterioration rate of the first secondary battery and a deterioration rate of the second secondary battery. Determining the voltage region or capacity region of the battery pack corresponding to the overdischarge region;
A control device that individually outputs a detection signal to the first secondary battery and the second secondary battery when the voltage or the capacity of the assembled battery is included in the voltage region or the capacity region.
In claim 4,
Having a switch connecting positive electrodes and negative electrodes of the first secondary battery and the second secondary battery,
Opening and closing of the switch is controlled by the control unit,
The control unit controls opening and closing of the switch based on the detection signal, and both the first secondary battery and the second secondary battery are included in the overcharge region or the overdischarge region. A control device for leveling the voltage of the first secondary battery and the voltage of the second secondary battery so as not to be present.
In claim 4,
A switch connecting positive electrodes and negative electrodes of the first secondary battery and the second secondary battery;
An ammeter for detecting a current flowing in the first secondary battery and the second secondary battery disposed in the vicinity of the switch;
Opening and closing of the switch is controlled by the control unit,
The control unit controls the opening and closing of the switch based on the detection signal to cut off the current value of the first secondary battery or the current value of the second secondary battery.
A control device according to any one of claims 1 to 6 and a power supply device having the assembled battery.
A first chargeable / dischargeable secondary battery having a first characteristic;
A control method for an assembled battery configured by connecting in series or in parallel a second chargeable / dischargeable secondary battery having a second characteristic different from the first characteristic,
Storing the first characteristic and the number of the first secondary batteries and the second characteristic and the number of the second secondary batteries included in the assembled battery by a storage unit;
Detecting the voltage of the assembled battery with a voltmeter;
Detecting a voltage change rate as a voltage difference with respect to a capacity difference of the assembled battery or a capacity change rate as a capacity difference with respect to the voltage difference of the assembled battery based on an output of the voltmeter by the control unit;
In the control unit, the voltage change rate or the capacity change rate, the number of the first characteristic and the first secondary battery, the number of the second characteristic and the second secondary battery, And a step of determining a deterioration rate of the first secondary battery and a deterioration rate of the second secondary battery based on the above.