JP2003077548A - Battery managing method and system for battery set - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately find the remaining capacity of a battery set and control the display of the remaining capacity, the safe charge of the battery set and the consumption of power supplied to equipment for solving the problem on the battery set having a plurality of battery cells connected in series when out of cell balance that the remaining capacity of the battery set cannot be actually calculated in spite of the control of the remaining capacity of the battery cells using battery voltage only as usual, thus making it very difficult to manage power supplied to a battery set equipment system in accordance with remaining capacity data for the battery set. SOLUTION: The display of the remaining capacity of the battery set or the control of the battery set equipment system is performed by controlling the remaining capacity of each battery cell instead of the voltage of each battery cell. For that purpose, independent and accurate cell remaining capacity calculating means for each cell is provided in battery set managing means.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION In a battery device system driven by an assembled battery, a battery management method and system for displaying the remaining capacity, charging, power saving of the device, balance adjustment of battery cells, etc., and the method are stored. Recording medium

[0002]

2. Description of the Related Art A battery pack device system is basically a battery pack in which a battery pack and battery management means are housed in a case, but the battery pack and the set body are similar to those of a laptop computer, a video camera, or a hybrid car. A form in which communication is performed and batteries are managed is also included. Among conventional devices driven by batteries, mobile phones, digital still cameras, etc. can be driven by a single cell voltage of one battery, but video cameras, laptop computers, etc. can be operated by a single cell voltage even if a lithium-ion battery with high battery voltage is used. The cell voltage is insufficient. Therefore, a desired battery voltage is obtained by connecting a plurality of single cells in series to form an assembled battery.
Further, in the conventional battery management means, the remaining battery capacity is calculated and displayed on a display device such as a liquid crystal, and is used for management such that the user turns off the power of the device or charges the device. Alternatively, there is a device that manages the battery by automatically reducing the brightness of the liquid crystal when the remaining battery capacity becomes low and saving power. Both are methods of obtaining the remaining battery capacity and managing the battery based on the information.

For the calculation of the remaining battery capacity, conventionally, in the case of a single cell battery, there are a voltage method for converting the voltage of the battery cell into the remaining battery capacity and a current integration method for integrating the current flowing in and out of the battery. Alternatively, there is a method that combines the voltage method and the current method. In the case of an assembled battery, the entire assembled battery is regarded as one cell, the voltage of the entire assembled battery and the current flowing in and out of the entire assembled battery are detected, and a method similar to that of the single cell battery is implemented.

Further, the battery pack connected in series has a problem that the voltage balance of each battery cell is lost. The cause of the unbalanced voltage is when the battery cells are assembled into an assembled battery,
The case where the voltage of the battery cell is different from the beginning or the case where the battery capacity of each battery cell is different is raised. When the voltage balance of the battery cells is lost, there is a problem that a battery cell having a high voltage is overcharged or another battery cell is insufficiently charged during charging. Further, during discharging, there is a problem that a battery cell having a low battery voltage is over-discharged, or the entire assembled battery has a discharge end voltage while the battery capacities of other battery cells remain. In either case, the usable capacity of the assembled battery is reduced as a result. Therefore, conventionally, the voltage of each battery cell is independently detected, and when a difference of a predetermined voltage or more occurs in each voltage, the battery cell with a higher voltage is discharged and the control is performed to match the voltage of the battery cell with a lower voltage. ing.

[0005]

Normally, when battery cells are connected in series to form an assembled battery, battery cells having basically the same capacity should be used and the voltage of all the battery cells should be substantially the same. , We are taking a so-called cell balance to assemble. Therefore, in calculating the remaining battery capacity of the assembled battery, there is often no problem even between the new batteries, even with the conventional remaining battery capacity calculating method. However, when charging and discharging are repeated many times, the capacity of each battery cell becomes non-uniform due to deterioration or the like, and the voltage of each battery cell also becomes non-uniform. Then, at the time of charging, even if the battery pack has a normal charging voltage, the battery cell with a large battery capacity will not have a sufficient charging voltage and will not reach full charge. There is a problem that ends up. In addition, during discharge, when the discharge end voltage of the entire assembled battery is reached, there is a battery cell in which the battery capacity still remains, and there is a problem that the assembled battery reaches the end voltage before the capacity is used up. Therefore, the actual remaining capacity of the assembled battery is naturally smaller than the calculated value, and the accuracy of the remaining capacity display of the assembled battery device system using the conventional calculation method is significantly reduced.

In addition, during charging, battery cells with a small battery capacity are overcharged, which reduces safety, and an assembled battery using a lithium ion cell operates an overvoltage protection circuit to reduce the current of the assembled battery. This will cause a big problem that the equipment will be unusable. Therefore, conventionally, when the voltage balance of each battery cell becomes unbalanced, a closed circuit composed of a switch and a discharge resistor is provided in each battery cell, and a high voltage battery cell is changed to a low voltage battery cell voltage. Several types of management methods for adjusting the cell balance such as discharging have been proposed. For example, Japanese Patent Application No. 5-47535 and Japanese Patent Application No. 8-2
00260, Japanese Patent Application No. 9-346550, Japanese Patent Application 10-32.
887 and Japanese Patent Application No. 11-61307 have been filed as patents or utility models. However, both methods
This is a method of adjusting the voltage of each battery cell to be the same. However, even if the voltage of each battery cell with an unbalanced battery capacity is the same, the remaining capacity of each battery cell and the chargeable capacity until fully charged are not the same, so the remaining capacity display accuracy of the assembled battery is large. An error occurs. Furthermore, when the battery pack is charged and discharged, the current flowing through each battery cell battery connected in series is the same, so some battery cells will be overcharged when charged and some battery cells will be overdischarged when discharged. The major problems that have arisen have not been resolved.

Therefore, the object of the present invention is to calculate the accurate remaining capacity of the entire assembled battery and display the remaining capacity in the assembled battery in which a plurality of battery cells are connected in series even when the cell balance is lost. It is an object of the present invention to provide a management method, a system, or a recording medium in which the method is controlled and a device user or a device can automatically and accurately control the assembled battery.

[0008]

In order to achieve the above-mentioned object in an assembled battery equipment system composed of an assembled battery consisting of a plurality of battery cells connected in series and an assembled battery management means, the present invention provides an assembled battery management means. Has the following technical means. It includes a cell remaining capacity calculating means for a plurality of battery cells, a cell remaining capacity selecting means for selecting a cell remaining capacity to be used as a remaining capacity of an assembled battery from the obtained plurality of cell remaining capacities, or a plurality of battery cells. A cell chargeable capacity calculating means, a cell chargeable capacity selecting means for selecting a cell chargeable capacity to be used as a chargeable capacity of an assembled battery from a plurality of chargeable capacities, and a control means for an assembled battery device system. That is, the present invention does not manage the voltage of the entire assembled battery and the current flowing in or out as in the conventional case, or manages only the voltage of each battery cell, but manages the remaining capacity of each battery cell,
This is a method of displaying the remaining capacity of the assembled battery or controlling the assembled battery device system. Alternatively, there is a feature that it is a system constituting the method or a recording medium recording the method.

Further, according to the present invention, as a means for calculating the remaining capacity of a battery cell, the present inventor has proposed a Japanese Patent Application No. 2001-1734.
The method of converting the remaining capacity of the battery, which was filed for patent in No. 43, was adopted. Conventionally, it was extremely difficult to calculate the remaining capacity of each battery cell in which the cell balance in the assembled battery was lost.
The remaining capacity of the battery cell can be easily calculated by using the remaining capacity conversion method of the battery according to 01-173443.

The control means of the present invention displays the remaining capacity of the assembled battery by using the cell calculated capacity selected by the remaining cell capacity selecting means from the remaining cell capacity calculated by the remaining cell capacity calculating means. Therefore, there is a feature that the device user can take the initiative in saving the power of the device.

Further, the control means of the present invention uses the cell chargeable capacity selected by the cell chargeable capacity selecting means from the cell chargeable capacity calculated by the cell chargeable capacity calculating means to charge the assembled battery. There is a feature to control.

Further, according to the present invention, the control means independently changes the remaining capacity of any battery cell to adjust the cell balance, thereby suppressing the decrease in the usable capacity of the assembled battery and enhancing the safety. is there.

Further, according to the present invention, the amount of electricity flowing in a closed circuit for cell balance adjustment independently provided in each battery cell is added to or subtracted from the amount of electricity flowing in the entire battery pack, and the electricity is supplied to each battery cell. It is characterized in that the amount of electricity is used to increase the accuracy of the cell remaining capacity calculation means or the cell chargeable capacity calculation means.

Further, the control means of the present invention is characterized in that the assembled battery device system is automatically controlled to save the power of the device.

The present invention is also characterized in that the control means automatically saves the power of the equipment.

[0016]

Embodiment 1 of the present invention will be described in detail with reference to the block diagram of FIG. First, n battery cells are connected in series to form an assembled battery. In FIG. 1, n is described as 3 pieces, but the purpose of the description is not changed as long as n is 2 or more. The remaining battery capacity calculation means 4 to 6 are connected in parallel to the battery cells 1 to 3, respectively. Further, each of the cell remaining capacity calculating means 4 to 6 inputs to the cell remaining capacity selecting means 7. Further, the cell remaining capacity selection means inputs the control means 8. Input / output to / from the assembled battery is performed through the anode 9 and the cathode 10. The operation programs of the cell remaining capacity calculating means 4 to 6, the cell remaining capacity selecting means 7 and the control means 8 are stored in the microcomputer 11.

The cell remaining capacity calculation means 4 to 6 will be described with reference to FIG. 2 using the battery remaining capacity conversion method that the present inventor applied for a patent in Japanese Patent Application No. 2001-173443. The cell residual capacity calculating means 4 to 6 are means for independently calculating the residual capacities of the respective battery cells 1 to 3, but their configurations may be the same.
Further, one cell remaining capacity calculating means 4 may be used by switching the battery cells 1 to 3 by a multiplexer or the like. That is, the remaining capacity calculating means 4 to 6 are composed of a cell voltage acquiring means 12, an open circuit voltage-remaining capacity converting means 13, a current minimum value specifying means 14, a current integrating means 15 and a current acquiring means 16. Current acquisition means
16 used one method of current detection which detects the voltage generated across the current detection resistor 17 connected in series to the battery cells 1 to 3.

The operation flow is shown in FIG. First, step 1 and subsequent steps (S1) are displayed, but the power is turned on (S1).
1) Then, the microcomputer 11 is turned on (S2). Next, the current flowing by the current acquisition means 16 is detected (S3). Next, the minimum current value specifying means 14 is used to specify the minimum current value (S
4).

Next, the open circuit voltage of the battery cells 1 to 3 is acquired using the battery voltage acquisition means 12 (S5). Generally, the open-circuit voltage is a voltage when the electric circuit connecting the positive electrode and the negative electrode of the battery is opened, that is, when the current flowing in and out of the battery is zero. However, the smaller the current is, the closer the voltage is to the open circuit voltage. Therefore, the voltage when the current becomes lower than the minimum value may be defined as the open circuit voltage. For example, in the case of a mobile phone, there is a state in which only a minute current flows during standby, and in a notebook computer, there is a state in which only a minute current flows to acquire the cell voltage and store it even if the power is turned off. . The cell voltage at that time can be regarded as an open circuit voltage.

Next, the open circuit voltage-remaining capacity converting means 13 is used to convert the acquired open circuit voltage (S5) of the battery cells 1 to 3 into the remaining capacity (S6). Open-circuit voltage-remaining capacity conversion means 13
Measures the battery characteristics in the initial stage in which the battery cells 1 to 3 have not deteriorated in advance, obtains the data of the open-circuit voltage vs. the remaining capacity, makes the conversion table 18, and saves it in a non-volatile memory such as a ROM. .

Next, when the current exceeds the minimum value and starts to flow (S7), the remaining capacities (S) of the converted battery cells 1 to 3 (S
6) is set to the initial value (S8), and the current integration means 5 is used to
The flowing currents are integrated and the amount of electricity Q that has flowed is counted (S9). By the way, in this specification, the discharge current is calculated as positive and the charge current is calculated as negative.

Next, the initial value of the remaining capacity of the battery cells 1 to 3 (S
The electricity quantity Q (S9) counted from 8) is subtracted or added (S10). In this way, the remaining capacities of the battery cells 1 to 3 are updated to new remaining capacities while subtracting or adding the initial value (S8) with the electric quantity Q (S9) (S11).

The operation flow so far (S1) to (S11)
Is independently performed for each of the battery cells 1 to 3. Therefore, three remaining capacities are obtained. The remaining capacities of the battery cells 1 to 3 are indicated as Cr (1) to Cr (3), respectively.

Next, in the cell remaining capacity selecting means 7, Cr (1) to C (C)
The remaining battery cell remaining capacity is selected from r (3) (S12), and the remaining capacity of the assembled battery is determined (S13).

Next, the confirmed remaining battery capacity (S13) is input to the control means 8. The control means 8 displays the remaining capacity on a liquid crystal display or the like. The device user can check the remaining capacity of the assembled battery and perform battery management such as turning off the power of the device or replacing the battery.

Next, a second embodiment for controlling the charging of the assembled battery will be described. Battery cells 1 to 3 and assembled battery management means
The configuration of 20 is the same as that of FIG. 2 shown in the first embodiment. Also, steps (S1) to (S11) of the operation flow shown in FIG.
Are the same, so (S11) and subsequent figures are shown in FIG. The remaining capacity of each battery cell 1 to 3 when fully charged, that is, the capacity, is not always the same from the time of assembling the assembled battery. In addition, the variation of each capacity increases due to factors such as deterioration. Therefore, the capacity of each battery cell is distinguished and displayed as Cf (1) to Cf (3),
When the chargeable capacity is displayed as Cp (1) to Cp (3), the relationship of the equation (1) is established.

[0027]

[Equation 1]

Then, the cell chargeable capacity selecting means 21 finds Cp (m) by the formula (1), and finds the smallest Cp among them.
Select p (min) (S16). Next, the Cp (min) is determined to be the chargeable capacity of the assembled battery (S17). Next, using the control means 8, the assembled battery is charged by Cp (min) (18).
Then, the assembled battery can be charged to the maximum capacity without overcharging any of the battery cells 1 to 3.

As described above, the capacities Cf (m) of the battery cells 1 to 3 are not always the same. Furthermore, when the capacity of each battery cell changes due to deterioration, the conventional battery remaining capacity calculation method cannot calculate the degree of deterioration of the battery cells 1 to 3 assembled in the battery pack, so Cf (m) should be calculated. I can't. In the conventional voltage method and current integration method, Cf (m) becomes the reference value or the initial value, so in the current situation where Cf (m) cannot be obtained, the actual remaining capacity and the actual chargeable capacity of each battery cell 1 to 3 It is impossible to ask for.

There. A third embodiment, which is a method of obtaining and correcting Cf (m) of each battery cell, will be described with reference to the operation flowchart of FIG. FIG. 5 shows Japanese Patent Application No. 2001-173443.
It is the method of calculating the capacity deterioration degree shown in. First, when the current value is detected to be equal to or less than the minimum current value (S13), each open-circuit voltage Vn of the battery cells 1 to 3 is acquired (S5) and converted into the cell remaining capacity Crn0 (S).
6). Here, a subscript n such as Vn indicates the number of times that the current minimum value or less is detected, and Crn0 indicates the n-th cell remaining capacity of the battery cell when not deteriorated.

Next, returning to step 13, when the current flowing through the battery pack exceeds the minimum current value, Crn0 is set to the initial value (S8), and the quantity of electricity Qn flowing through the battery pack is counted (S9). . Until the minimum current value is detected again (S13),
The quantity of electricity Qn continues to be counted up (S9). When the current value below the minimum value is detected again (S13), the open circuit voltage V (n + 1) is acquired (S5) and converted into the remaining cell capacity Cr (n + 1) 0 (S).
6). By the way, the cell remaining capacity Crn0 and the remaining capacity Cr (n + 1) 0 are
Open-circuit voltage-remaining capacity conversion means 13, that is, the table of FIG.
It is the remaining capacity converted from the open circuit voltage Vn and V (n + 1) with reference to 18 (S6). The remaining cell capacity obtained from Table 18 is
It is the remaining capacity of the reference battery cell in which the battery cell is not deteriorated. On the other hand, for the quantity of electricity Qn, after acquiring the voltage Vn (S5),
It is the capacity actually used until the voltage V (n + 1 is acquired (S5) again. Therefore, the basic expression of the cell deterioration degree αc, which indicates the ratio of deterioration of the battery cells, is expressed by Expression (2). .

[0032]

[Equation 2]

The deterioration degree αc of the equation (1) is set such that αc is 1 if the cell is not deteriorated and the deterioration degree becomes larger. Also, the quantity of electricity Qn during discharging is treated as positive and the quantity of electricity Qn during charging is treated as negative. However, if Qn is very small, the difference between Vn and V (n + 1) also becomes small, and the cell voltage acquisition means 12 may not be able to determine the voltage difference. So Qn
Should be adopted only when the amount exceeds a predetermined amount. Degradation of battery cells tends to progress gradually, and the cell degradation degree αc
Since it is not necessary to update, the present embodiment may be implemented only when Qn is sufficiently large and the cell deterioration degree αc is accurately obtained.

Although not shown in the flow chart of FIG. 5, if the cell deterioration degree αc thus obtained is not 1, step 6
The cell remaining capacity Crn0 of is divided by αc and corrected to obtain the actual remaining capacity Crn. The initial value of step 8 is also updated with the cell remaining capacity Cn0 to the actual cell remaining capacity. The correction is expressed by equation (3).
m shows that it calculates independently about each battery cell 1-3.

[0035]

[Equation 3]

If the actual capacity Cf is the actual cell remaining capacity when fully charged considering the deterioration of the cell and the cell remaining capacity when the reference battery is fully charged is the capacity Cf0, then Cf is expressed by equation (4). .

[0037]

[Equation 4]

When the normal battery cells 1 to 3 are connected to form an assembled battery, the capacities Cf0 of the battery cells 1 to 3 are not actually measured. However, in order to make it as uniform as possible, combine the battery cells in the same production lot. Therefore, the battery characteristics such as the discharge curve and the charge curve are almost similar.
Therefore, if the standard characteristics Cf0 (avr) are determined in advance by actually measuring the average characteristics of the production lot, Cf (m) can be obtained by replacing Cf0 (m) in Eq. (4) with Cf0 (avr). It can be obtained by correction using the equations (2) and (4).

As described above, since the actual capacities of the battery cells 1 to 3 when fully charged can be obtained even if they change due to factors such as deterioration, the remaining cell capacity and the cell chargeable capacity can be calculated. Therefore, the control unit 8 can display the accurate remaining capacity and chargeable capacity of the assembled battery on the liquid crystal display or the like. In addition, overcharging of the battery cells 1 to 3 can be prevented and safety can be improved.

Next, a fourth embodiment in which the control means 8 balances the battery cells 1 to 3 will be described with reference to the block diagram of FIG. In this configuration, switches 19 to 21 and balance resistors 22 to 24 are connected in series to the battery cells 1 to 3 and closed circuits 25 to 27 are added to FIG.

Next, FIG. 7 will be described in which FIG. 3 is modified so that the control circuit 8 has an operation flow in the case where the actual remaining capacities of the battery cells 1 to 3 are used for balancing. FIG. 7 shows step 9 and subsequent steps in FIG. First, the remaining capacity Cr (min) with the smallest remaining capacity was selected from the results of the remaining capacity calculation of the battery cells 1 to 3 (S11) (S12). For example, if it is the battery cell 1, the remaining capacity Cr of the other battery cells 2 and 3 is
(2), Cr (3) is more than Cr (1). Then, the control means 8 is used to turn on the switches 20 and 21. Then, in the closed circuit 26, a single current flows through the battery cell 2 through the balance resistor 23, and Cr (2) is consumed. Even in the battery cell 3, Cr (3) is similarly consumed in the closed circuit 27.
Cr (2) and Cr (3) are discharged until they become equal to Cr (1) respectively, and when they become almost equal (S22), switch 20 and switch 21 are turned off to stop the discharge in closed circuits 26 and 27. Yes (S23).

By the way, while the switches 20 and 21 are on, in step 20, the currents flowing through the closed circuits 26 and 27 are counted and the currents are integrated, and the amount of electricity is subtracted from the cell remaining capacity updated in step 11. (S21). Step it
Return to 11 and update to the remaining cell capacity including the amount of electricity flowing in the closed circuit. In this way, the remaining cell capacity Cr (2), Cr (3), C
When r (1) is controlled to be equal, when the assembled battery reaches the discharge end voltage, the remaining capacity of battery cells 1 to 3 becomes equal to zero, and the voltage of each battery cell 1 to 3 becomes equal to the end voltage. Therefore, normal cell balance can be secured.

Next, FIG. 8 will be described in which FIG. 7 is modified so that the control circuit 8 has an operation flow in which cell balancing is performed using the actual chargeable capacities of the battery cells 1 to 3. First, the maximum cell chargeable capacity Cp (max) was selected from the results (S15) of calculating the cell chargeable capacity of the battery cells 1 to 3 (S16). For example, if it is battery cell 1,
The rechargeable capacities Cp (2) and Cp (3) of the other battery cells 2 and 3 are C
Less than p (1). Therefore, switch using the control means 8.
20 and switch 21 are turned on (S19). Then closed circuit 26
Then, a single current flows through the battery cell 2 through the balance resistor 23, and Cr (2) is consumed. Even in the battery cell 3, Cr (3) is similarly consumed in the closed circuit 27. Cr (2)
And Cr (3) are discharged until Cp (2) and Cp (3) become equal to Cp (1) and become almost equal (S22). Then, the switch 20 and the switch 21 are turned off (S23) and the closed circuit 26 , Stop the discharge at 27.

In step 20, the current is counted and the current is also integrated, and the amount of electricity is subtracted from the cell remaining capacity updated in step 11 (S21). It is the same as in the case of discharging that the value is returned to step 11 and the cell remaining capacity is updated including the amount of electricity that has flown in the closed circuit. When the cell chargeable capacities Cp (2), Cp (3) and Cp (1) are controlled to be equal in this way, when the assembled battery reaches full charge, the battery cells 1 to 3 are also fully charged. Therefore, the battery cell which is overcharged does not occur. Therefore, a normal cell balance during charging can be secured.

Next, a fifth embodiment in which the control means 8 automatically controls the power consumption of the battery pack device system will be described. For example, in the case of a video camera, when the remaining capacity of the battery pack becomes low, power saving such as turning off the backlight of the liquid crystal is performed. In the case of a hybrid car driven by a battery motor and a gasoline engine, when the remaining capacity of the battery pack becomes low, control is performed to switch from battery motor drive to gasoline engine drive. Since automation of these device controls is a well-known technique, detailed description using the drawings will be omitted.

[0046]

According to the first aspect of the present invention, instead of managing the voltage of the entire assembled battery and the current flowing in or out as in the prior art or managing only the voltage of each battery cell, the remaining capacity calculating means is set to 4 to 6. The remaining capacities of the battery cells 1 to 3 obtained by using are managed. Therefore, even if the assembled battery has a broken cell balance, the remaining capacity of the assembled battery is displayed or the assembled battery device system is controlled with the correct actual remaining capacity of the assembled battery. As a result, there is an effect of solving the problem that the management accuracy of the entire assembled battery is lowered as the cell balance is lost.

In claim 2, the present inventor applies for a patent 20
By adopting the battery remaining capacity conversion method filed for patent in 01-173443, it is possible to accurately determine the remaining capacities of the battery cells 1 to 3 in the assembled battery in which the cell balance has been lost, which was impossible in the past. Therefore, the power management of the battery device system can be accurately controlled, which is a great effect.

In the third aspect, the control means 8 calculates the remaining capacity of the cell based on the first aspect and displays the remaining capacity, so that there is an effect that the equipment user can accurately perform power management.

In the fourth aspect, the control means 8 calculates the cell chargeable capacity by using the cell remaining capacity calculated according to the first aspect, and the control means 8 controls the charging based on the calculation result. . Therefore, the battery can be charged without the occurrence of overcharged battery cells, which has a great effect on safety.

In the fifth aspect, the cell remaining capacity calculated by the cell remaining capacity calculating means based on the first aspect is used to calculate an accurate amount of collapse of the cell balance. Then, the control means 8 adjusts the remaining capacity or chargeable capacity of the cell by the amount of the collapse, so that there is a great effect that an accurate cell balance can be secured.

Further, in claim 6, each battery cell 1 to
Closed circuit for cell balance adjustment independently provided in 3-25 to 27
Since the amount of electricity flowing to each battery cell 1 to 3 is added to or subtracted from the amount of electricity flowing to the whole assembled battery, the amount of electricity flowing to Has the effect of increasing

Further, in claim 7, the control means 8 is
Since the power consumption of the battery pack device system is automatically changed, the use time of the device can be extended.

In the eighth aspect, since the accurate assembled battery management method according to the first aspect is configured in the battery equipment system, there is an effect that the accuracy of the power supply management of the equipment is significantly improved.

According to a ninth aspect of the present invention, the program of the accurate battery pack management method according to the first aspect is stored in the RO in the microcomputer.
By storing in a recording medium such as M, mass production can be performed, cost can be reduced, and the assembled battery device system can be miniaturized.

[Brief description of drawings]

FIG. 1 is a block diagram of a battery pack management method according to a first embodiment.

FIG. 2 is a block diagram of an assembled battery management method according to the first embodiment.

FIG. 3 is a flowchart of a battery pack management method according to the first embodiment.

FIG. 4 is a flowchart of a battery pack management method according to a second embodiment.

FIG. 5 is a flowchart of an assembled battery management method according to a third embodiment.

FIG. 6 is a block diagram of an assembled battery management method according to a fourth embodiment.

FIG. 7 is a flowchart of an assembled battery management method according to a fourth embodiment.

FIG. 8 is a flowchart of an assembled battery management method according to a fourth embodiment.

[Explanation of symbols]

1, 2 and 3 are battery cells 4, 5 and 6 are cell remaining capacity calculating means 7 is a cell remaining capacity selecting means 8 is control means 9 is an anode 10 is the cathode 11 is a microcomputer 12 is a cell voltage acquisition means 13 is an open circuit voltage-remaining capacity conversion means 14 is the minimum current value acquisition means 15 is a current integrating means 16 is a current acquisition means 17 is the current detection resistor 18 is a conversion table 19, 20, 21 are switches 22, 23, 24 are balance resistors 25, 26, 27 are closed circuits

Claims (9)

[Claims] 1. An assembled battery device system comprising an assembled battery composed of a plurality of battery cells connected in series and a battery management means, wherein the battery management means comprises a remaining cell capacity calculation means or a cell rechargeable capacity calculation means. A cell remaining capacity selecting means or a cell rechargeable capacity selecting means, and a control means for controlling the assembled battery device system, wherein the cell remaining capacity calculating means calculates and obtains remaining capacity of a plurality of the battery cells. The remaining cell capacity to be used for the remaining capacity of the assembled battery is selected from among the plurality of remaining cell capacity, and the rechargeable capacity selecting means calculates the rechargeable capacity of the cell calculated using the rechargeable capacity calculating means of the cell. A battery pack management method for selecting a rechargeable capacity of the battery pack from among, and controlling the battery pack device system using the selected remaining cell capacity or the rechargeable capacity of the cell. 2. The cell remaining capacity calculation means is a current integration means for counting a current flowing in and out of the battery cell to obtain an electricity quantity Q, a current minimum value specifying means, and a cell voltage acquisition means for acquiring a cell voltage. And an open circuit voltage-remaining capacity converting means for converting the open circuit voltage of the battery cell into the remaining capacity of the battery cell,
When the current minimum value specifying means specifies the current minimum value or less, the cell voltage acquiring means acquires the voltage of the battery cell,
The open voltage to remaining capacity conversion means converts the voltage into the remaining capacity of the battery cell, and when the current exceeds the current minimum value, the remaining capacity obtained by the open voltage to remaining capacity conversion means. 2. The battery pack management method according to claim 1, wherein the electric charge Q accumulated using the current accumulating means is added to or subtracted from the initial value, and the remaining capacity of the battery cell is updated. 3. The assembled battery management method according to claim 1, wherein the control means is a means for displaying the remaining capacity of the assembled battery. 4. The assembled battery management method according to claim 1, wherein the control means is means for controlling charging of the assembled battery. 5. The assembled battery management method according to claim 1, wherein the control means is means for independently changing the remaining capacity of the battery cell. 6. A quantity of electricity obtained by the cell residual capacity calculating means or the cell chargeable capacity calculating means integrating the current flowing through a closed circuit for cell balance adjustment and integrating the current flowing through the entire assembled battery. 2. The assembled battery management method according to claim 1, wherein the amount of electricity flowing in the cell is added or subtracted with respect to. 7. The assembled battery management method according to claim 1, wherein the control means is means for changing the power consumption of the assembled battery device system. 8. An assembled battery management system using the assembled battery management method according to claim 1. 9. A recording medium programmed with the battery pack management method according to claim 1.