JP6919701B2 - Power storage status adjustment device, battery pack, load system and storage status adjustment method - Google Patents

Description

The present invention relates to a power storage state adjusting device, a battery pack, a load system, and a power storage state adjusting method.

In recent years, a technique for charging / discharging an assembled battery in which a plurality of storage batteries are connected in series has been actively developed.

For example, Patent Document 1 discloses a technique for adjusting the charging current and the discharging current in order to make the battery voltage of each storage battery the same when the assembled battery is charged and discharged.

However, in the technique disclosed in Patent Document 1, there is room for improvement in improving the charge / discharge efficiency.

The present invention is a storage state adjusting device for adjusting the storage state of an assembled battery in which a plurality of storage batteries are connected in series, and a current for balancing the voltage of the plurality of storage batteries during charging / discharging of the assembled battery is applied. A target value of the balance time, which is the time from the start of charging or discharging of the assembled battery to the balance of the voltages of the plurality of storage batteries, is set for the current supply circuit supplied to the assembled battery, and based on the target value. The current supply circuit includes a control system for controlling the current supply circuit, and the current supply circuit is connected to a primary side coil connected in series to the plurality of storage batteries and in parallel to each of the plurality of storage batteries. The control system includes a plurality of secondary side coils to which the energy stored in the coils is transmitted, and the control system sets the target value at a time other than charging / discharging of the assembled battery and is based on the target value. This is a storage state adjusting device that sets the total amount of energy stored in the primary coil.

According to the present invention, the charge / discharge efficiency can be improved.

It is a figure which shows the time change of the cell voltage (battery voltage) when the cell balance method is not introduced. 2 (A) and 2 (B) are diagrams illustrating battery packs 1'and 2'(cell balance current is fixed) of Comparative Examples, respectively. 3A and 3B are diagrams for explaining the battery packs 1 and 2 (variable cell balance current) of the first and second embodiments, respectively. It is a block diagram which shows the structure of the cell balance control system of Example 1 of 1st Embodiment. It is a circuit diagram which shows the structure of the variable constant current circuit connected to the primary side coil. It is a figure which shows the time change of the cell voltage when the cell is balanced in a relatively short time with respect to the charging time. It is a figure which shows the time change of the cell voltage when the cell is balanced just before the charging time. It is a flowchart for demonstrating the pre-cell balance processing. It is a flowchart for demonstrating the electricity storage state adjustment process of Example 1. FIG. It is a block diagram which shows the structure of the cell balance control system of Example 2 of 1st Embodiment. It is a flowchart for demonstrating the electricity storage state adjustment process of Example 2. It is a block diagram which shows the structure of the cell balance control system of Example 3 of 1st Embodiment. It is a flowchart for demonstrating the electricity storage state adjustment process of Example 3. It is a block diagram which shows the structure of the cell balance control system of Example 4 of 1st Embodiment. It is a block diagram which shows the structure of the cell balance control system of Example 5 of 1st Embodiment. It is a block diagram which shows the structure of the cell balance control system of Example 1 of 2nd Embodiment. It is a block diagram which shows the structure of the cell balance control system of Example 2 of 2nd Embodiment. It is a block diagram which shows the structure of the cell balance control system of Example 3 of 2nd Embodiment. It is a block diagram which shows the structure of the cell balance control system of Example 4 of 2nd Embodiment. It is a block diagram which shows the structure of the cell balance control system of Example 5 of 2nd Embodiment.

Hereinafter, the electricity storage state adjusting device according to the first and second embodiments of the present invention will be described with reference to the drawings.

The electricity storage state adjusting device of the first and second embodiments is an apparatus for adjusting the electricity storage state at the time of charging and discharging of an assembled battery in which a plurality of livestock batteries (also referred to as a secondary battery or a battery) are connected in series.

FIG. 1 shows a case where the battery voltage (cell voltage) is not balanced between the storage batteries when the assembled battery is charged and discharged.

In this way, if the battery voltage is not balanced between the storage batteries when charging and discharging the assembled battery, due to the variation in the capacity between the storage batteries, even if the same power is charged and discharged, some storage batteries will be overcharged / overdischarged. come. When the storage battery is in an overcharged state or an overdischarged state, power loss, deterioration of life, and safety problems occur.

Therefore, in recent years, a cell balance method for balancing the battery voltage between the storage batteries during charging / discharging of the assembled battery has been actively developed. Among the cell balance methods, the active cell balance method, which can realize cell balance with high efficiency and in a short time, is particularly attracting attention.

2 (A) and 2 (B) show battery packs 1'and 2'of Comparative Examples 1 and 2 in which the active cell balance method is introduced, respectively. In the following, the same components will be described with the same reference numerals in Comparative Examples 1 and 2.

As shown in FIG. 2A, the battery pack 1'of Comparative Example 1 includes an assembled battery 100, a flyback transformer, a power storage state adjusting circuit, a P + terminal, a P- terminal, and the like.

The power storage state adjustment circuit aims to equalize the battery voltages of a plurality of storage batteries (secondary batteries) included in the assembled battery 100, and adjusts the electricity storage state (that is, the power storage state) in each storage battery.

The power storage state adjusting circuit has a primary side drive unit and a secondary side distribution / discharge unit.

The primary side drive unit has a cell balance controller CBC1'and a drive switch element SW, and serves as an energy storage source on the primary side. The drive switch element SW is, for example, a MOSFET (Metal-Oxide-Semiconductor Field-Effective Transistor), a junction FET, a semiconductor switch element such as a bipolar transistor, or the like.

The secondary side distribution / discharge unit has diodes D1, D2, D3, and D4, and discharges electric power (energy) to each livestock battery and redistributes it.

In the battery pack 1', the assembled batteries 100 connected to the storage state adjusting device circuit are a plurality of (n) rechargeable storage batteries (also referred to as battery cells, secondary batteries, and storage means) BAT1 to BATn (here, storage means). Includes four livestock batteries BAT1, BAT2, BAT3, BAT4).

In the flyback transformer, the primary coil LP is the primary inductor, and the secondary coils L1, L2, L3, and L4 are the secondary inductors.

The power storage state adjustment circuit constitutes a flyback converter circuit. In the primary side drive unit, energy is supplied from the positive electrode of the assembled battery 100, the cell balance controller CBC1'controls the drive switch element SW, and the energy set by the cell balance controller CBC1' during the ON period of the drive switch element SW. Is stored in the primary side coil LP.

Since the primary coil LP is connected to the positive electrode of the assembled battery 100, energy is supplied from the charger and the entire assembled battery 100 during charging. When the drive switch element SW is switched to OFF, the energy supplied to the primary side coil LP is redistributed (output) to the secondary side coils L1 to L4, and the secondary side coils L1 to L4 are redistributed to the charger. And the energy consisting of the battery voltage is supplied to the storage battery having a low battery voltage.

Further, the primary coil LP receives energy supply from the entire assembled battery 100 when the load is connected. The energy supplied to the primary coil LP is redistributed to the secondary coils L1 to L4 when the drive switch element SW is turned off, and the energy supplied to the secondary coils L1 to L4 is derived from the redistributed battery voltage. Energy is supplied to a livestock battery with a low battery voltage.

The secondary side distribution / discharge unit is a discharge / redistribution unit, and when the drive switch element SW is OFF, the energy stored in the primary coil LP is transferred to the corresponding storage batteries BAT1 to BAT4 through the diodes D1, D2, D3, and D4. Discharge and supply to.

The flyback transformer stores energy in the primary coil LP during the ON period of the drive switch element SW. Then, when the drive switch element SW is switched to OFF, the flyback transformer outputs the stored energy to the secondary coils L1, L2, L3, and L4 at once by utilizing the backlash energy of the primary coil LP. ..

In Comparative Example 1, a device including a power storage state adjusting circuit and a flyback transformer is referred to as a “storage state adjusting device” (the same applies to Comparative Examples 2, 1 and 2 described later). The P + terminal of the battery pack 1'is connected to the positive electrode of the charger or load, and the P- terminal is connected to the negative electrode of the charger or load.

In the assembled battery 100, the storage batteries BAT1, BAT2, BAT3 and BAT4 are connected in series, the positive electrode of the livestock battery BAT4 is connected to the P + terminal, and the negative electrode of the livestock battery BAT1 is connected to the P- terminal.

The positive electrode of the storage battery BAT4 of the assembled battery 100 is connected to one end of the primary coil LP, and the other end of the primary coil LP is connected to one end of the drive switch element SW. The other end of the drive switch element SW is connected to the negative electrode of the storage battery BAT1 via a resistor R.

One end of the secondary coil L1 is connected to the negative electrode of the livestock battery BAT1, and the other end is connected to the positive electrode of the livestock battery BAT1 via a diode D1. One end of the diode D1 is connected to the other end of the secondary coil L1, and the other end is connected to the positive electrode of the storage battery BAT1.

One end of the secondary coil L2 is connected to the positive electrode of the livestock battery BAT1 and the negative electrode of the livestock battery BAT2, and the other end is connected to the positive electrode of the livestock battery BAT2 via the diode D2. One end of the diode D2 is connected to the other end of the secondary coil L2, and the other end is connected to the positive electrode of the storage battery BAT2.

One end of the secondary coil L3 is connected to the positive electrode of the livestock battery BAT2 and the negative electrode of the livestock battery BAT3, and the other end is connected to the positive electrode of the livestock battery BAT3 via the diode D3. One end of the diode D3 is connected to the other end of the secondary coil L3, and the other end is connected to the positive electrode of the storage battery BAT3.

One end of the secondary coil L4 is connected to the positive electrode of the livestock battery BAT3 and the negative electrode of the livestock battery BAT4, and the other end is connected to the positive electrode of the livestock battery BAT4 and the P + terminal via the diode D4. One end of the diode D4 is connected to the other end of the secondary coil L4, and the other end is connected to the positive electrode and the P + terminal of the storage battery BAT4.

The cell balance controller CBC1'generates and outputs a switch element control signal Scon that controls ON / OFF of the drive switch element SW. Specifically, the switch element control signal Scon is, for example, a rectangular pulse signal that turns on the drive switch element SW at a predetermined timing.

One end of the resistor R is connected to the cell balance controller CBC1'and the drive switch element SW. The other end of the resistor R is connected to the P- terminal.

In the battery pack 2'of Comparative Example 2, the primary coil LP1, LP2, LP3, and LP4 are the inductors on the primary side of the flyback transformers 1 to 4, respectively, and the secondary coils L1, L2, L3, and L4 are the flyback transformers, respectively. It is an inductor on the secondary side of 1 to 4. Further, resistors R1 to R4 are provided corresponding to the flyback transformers 1 to 4.

The power storage state adjustment circuit of Comparative Example 2 constitutes a flyback converter circuit. In the primary side drive unit, energy is supplied from the charger and the entire assembled battery 100, and the cell balance controller CBC2'individually controls the four drive switch elements SW1 to SW4 corresponding to the four primary side coils LP1 to LP4. Therefore, the energy set by the cell balance controller CBC2'is stored in the corresponding primary coil during the ON period of at least one drive switch element.

In Comparative Example 2, the measured values of the voltage sensors VS1 to VS4 for measuring the battery voltages of the four storage batteries BAT1 to BAT4 are sent to the cell balance controller CBC2', and for example, from the average value of the battery voltages of the four storage batteries BAT1 to BAT4. The drive switch element corresponding to the storage battery having a low battery voltage is turned on, and energy is stored in the corresponding primary coil.

Since each primary side coil is connected to the positive electrode and the P + terminal of the assembled battery 100, at least one primary side coil receives energy supply from the entire assembled battery 100 and the charger at the time of charging. The energy supplied to at least one primary coil is redistributed (output) to the corresponding secondary coil when the corresponding drive switch element is switched off, and the charger with which the secondary coil is redistributed. And the energy consisting of the battery voltage is supplied to the storage battery having a low battery voltage.

Further, at least one primary coil receives energy from the entire assembled battery 100 when the load is connected. The energy supplied to at least one primary coil was redistributed to the secondary coils L1 to L4 when the corresponding drive switch element SW was turned off, and the secondary coils L1 to L4 were redistributed. The energy consisting of the battery voltage is supplied to the storage battery having a low battery voltage.

According to the storage state adjusting devices of Comparative Examples 1 and 2 described above, a constant current (cell balance current) can be selectively supplied to the secondary coil L1 to L4 via at least one primary coil. It is possible to balance the cells.

By the way, as an important need for a storage battery, it is desired that the drive time of a device (load) can be utilized for as long as possible with one charge. Further, for automobiles that can charge gasoline in a few minutes, in order to popularize electric vehicles that are driven by storage batteries, there is a problem that the charging time usually extends to a long time of one hour or more. ..

As a countermeasure for this problem, it is conceivable to increase the cell balance current of the assembled batteries of the battery packs 1'and 2'of Comparative Examples 1 and 2 to the storage battery, but this causes an increase in the size of the circuit and an increase in power loss. Is a concern.

More specifically, it is necessary to pass a larger current than usual during high-speed charging / discharging. For example, in order to fully charge the storage battery in 5 minutes, it is necessary to charge and discharge the storage battery 12 times faster than charging the storage battery in 1 hour. It is necessary to pass 12 times the current in the current value, and it is necessary to increase the cell balance current in order to complete the cell balance rapidly. The energy loss of the storage battery is the value obtained by multiplying the square of the current flowing through the internal resistance of the circuit and the storage battery by the sum of the circuit resistance and the internal resistance.

However, if a large cell balance current is passed to ensure high-speed charging, the energy loss (power loss) becomes large. For example, the energy loss (NI) when the cell balance current I is multiplied by N is ² × R × t = NI × NIRt, which is NI times the energy loss I × R × Nt = NIRt in the case of the cell balance current I.

Therefore, the inventor has described the battery packs 1 of the first and second embodiments shown in FIGS. 3 (A) and 3 (B) as battery packs compatible with high-speed charging that can suppress an increase in size and power loss. , 2 was developed. In the following description of the first and second embodiments, the same components as those of Comparative Examples 1 and 2 are designated by the same reference numerals.

The battery packs 1 and 2 of the first and second embodiments are improved based on the battery packs 1'and 2'of Comparative Examples 1 and 2, respectively.

That is, as can be seen from FIG. 3A, the battery pack 1 of the first embodiment is provided with the variable constant current circuit 400 instead of the drive switch element SW, and the first embodiment of the first embodiment. As can be seen from FIG. 4 showing the cell balance control system, the cell balance controller CBC1 includes a voltage monitoring unit 500, a balance time target value setting unit 600, a coil current control unit 700, a storage unit 800, and a timer 900. It differs from the battery pack 1'of Comparative Example 1 in that four voltage sensors VS1 to VS4 for measuring the battery voltages of the storage batteries BAT1 to BAT4 are provided.

The variable constant current circuit 400 functions as a current adjusting unit that adjusts the current flowing through the primary coil LP, that is, an energy adjusting unit that adjusts the energy stored in the primary coil LP.

As shown in FIG. 5, the variable constant current circuit 400 includes a variable current source 400a and a current mirror circuit having two MOSFETs 400b and 400c. A junction FET or a bipolar transistor may be used instead of the MOSFET.

The gates of the two MOSFETs 400b and 400c are connected to each other, and the drains are connected to each other.

In the MOSFET 400b, the source and the gate are connected (short-circuited), and the source is connected to the positive electrode of the variable current source 400a. When the current from the variable current source 400a flows as the reference current Iref between the source and drain of the FET 400b, the output current Iout which is a copy of the reference current Iref flows between the source and drain of the FET 400c. The output current Iout is supplied to the primary coil LP. The magnitude of the reference current Iref and thus the output current Iout is determined by the coil current set value sent from the coil current control unit 700 of the cell balance controller CBC1 to the variable current source 400a.

The voltage monitoring unit 500 monitors (monitors) the measured values of the four voltage sensors VS1 to VS4, and at any time, takes the difference between the battery voltages (cell voltages) of the plurality of storage batteries BAT1 to BAT4, and balance time target value setting unit 600. Output to.

Here, the difference between the battery voltages of the plurality of storage batteries may be the difference between the battery voltages of the storage battery having the highest or lowest battery voltage and the battery voltage of the other storage battery, or the difference between the battery voltages of each storage battery and the other storage battery. You may. Further, instead of the difference between the battery voltages of the plurality of storage batteries, for example, the difference between the battery voltage of each storage battery and the average value of the battery voltages of the plurality of storage batteries may be used.

The balance time target value setting unit 600 sets the balance time target value BTt, which is the target value of the balance time BT, which is the time from the start of charging or discharging of the assembled battery 100 to the balance of the voltages of the plurality of storage batteries.

More specifically, the balance time target value setting unit 600 describes the difference between a plurality of battery voltages from the voltage monitoring unit 500 when the charger and the load are not connected to the battery pack 1, and the current stored in the storage unit 800. Based on the upper limit value Imax, the charging time CT, and the discharging time DCT, the balance time target values BTt-C and BTt-DC at the time of charging and discharging are calculated and stored in the storage unit 800. Examples of the storage unit 800 include a memory and a hard disk.

Specifically, the balance time target value BTt-C at the time of charging is a time equal to or less than the charging time CT (for example, 64 ms), and is equal to or less than the current upper limit value Imax (for example, 44 A) from the initial charge (for example, at the start of charging). It can be calculated and set as a time during which the battery voltages of the four storage batteries BAT1 to BAT4 can be balanced by supplying the coil current to the primary coil LP (see FIGS. 6 and 7).

FIG. 6 shows an example of cell balancing in a relatively short time with respect to the charging time CT (about 64 ms). Here, the balance time target value BTt-C is calculated and set to about 56 ms. There is.

FIG. 7 shows an example of cell balancing at substantially the same time as the charging time CT (about 64 ms). Here, the balance time target value BTt-C is calculated and set to about 64 ms.

The balance time target value BTt-DC at the time of discharge can also be calculated and set based on the discharge time as in the case of charging. In FIGS. 6 and 7, the voltage at which the battery voltages of the plurality of storage batteries are balanced (substantially matched) is 3.3V to 3.6V.

Here, each balance time target value is the total amount of energy stored in the primary coil LP from the start of charging or discharging to the balance time target value (W = ∫1 / 2LI ² , where L is self-inductivity and I is current. ) Is set to be equal to or less than the intermediate value between the maximum value and the minimum value of the total energy storage amount when an arbitrary time from the start of charging to the charging time CT or the discharging time DCT is set as the balance time target value. Is preferable, and it is most preferable that the minimum value is set.

The coil current control unit 700 has a difference between the battery voltage (cell voltage) from the voltage monitoring unit 500 when the charger and the load are not connected to the battery pack 1, and the current upper limit value Imax stored in the storage unit 800. Calculate the amount of coil current (coil current value x supply time) to be supplied to the primary coil LP during charging and discharging based on the charging time CT, discharging time DCT, balance time target values BTt-C, and BTt-DC. It is set, and the set value of the coil current amount at the time of charging and discharging is stored in the storage unit 800.

Further, the coil current control unit 700 reads out the set value of the corresponding coil current amount from the storage unit 800 when the battery pack 1 is connected to the charger for charging or when the battery pack 1 is connected to the load (equipment) for discharging. , A drive signal (a pulse signal having a predetermined cycle with the coil current value as the pulse amplitude and the supply time as the pulse width) corresponding to the set value is sent to the variable constant current circuit 400. The variable constant current circuit 400 supplies the set coil current amount to the primary coil LP.

A detection signal or a non-detection signal from the charger / load connection detection unit 960 is transmitted to the coil current control unit 700. The charger / load connection detection unit 960 detects whether or not a charger or load is connected to the battery pack 1 by changing the voltage between the P + terminal and the P- terminal. That is, when the change in voltage between the P + terminal and the P- terminal is large, the presence / absence of the charger connection can be detected, and when the change is small, the presence / absence of the load connection can be detected.

Hereinafter, the pre-cell balance processing by the cell balance control system of the first embodiment of the battery pack 1 of the first embodiment will be described with reference to the flowchart of FIG. This pre-cell balance process is repeated when the battery pack 1 is not connected to the charger or the load, that is, when the battery pack 1 is not charged or discharged. That is, the pre-cell balance process is performed at a time other than charging / discharging, for example, after several minutes to several hours have passed since the previous time.

In the first step S1, the voltage monitoring unit 500 calculates the difference between the battery voltages of the plurality of storage batteries from the measured values of the plurality of voltage sensors V1 to V4, and outputs the difference to the balance time target value setting unit 600.

In the next step S2, the balance time target value setting unit 600 sets the balance time target value during charging and discharging based on the difference between the battery voltages of the plurality of storage batteries, the charging time CT and the discharging time DCT, and the current upper limit value Imax. BTt-C and BTt-DC are calculated.

In the next step S3, the balance time target value setting unit 600 stores the calculated balance time target values BTt-C and BAT-DC in the storage unit 800.

In the next step S4, the coil current control unit 700 sets the balance time target values BTt-C and BTt-DC from the start of charging and discharging based on the current upper limit values Imax and the balance time target values BTt-C and BTt-DC. Calculate and set the coil current to be supplied to the primary coil LP in order to balance the voltages of the plurality of storage batteries.

In the next step S5, the coil current control unit 700 stores the set values of the coil current during charging and discharging in the storage unit 800. When step S5 is executed, the flow ends.

By the pre-cell balance processing performed as described above, theoretically, the battery pack 1 is in a state where the cell balance at the time of charging / discharging is taken before charging / discharging.

Next, the electricity storage state adjustment process (also referred to as cell balance process, the same applies hereinafter) by the cell balance control system of the first embodiment will be described with reference to the flowchart of FIG. This storage state adjustment process is performed when the battery pack 1 is charged and discharged after the pre-cell balance process. Specifically, it is started by the coil current control unit 700 when the battery pack 1 is connected to the charger or the load. At this time, the timer 900 starts timing. When the battery pack 1 is connected to or disconnected from the charger or load, a signal is notified (charger connection signal, charger connection release signal, load connection signal, load connection release signal). Is transmitted from the charger / load connection detection unit 960 to the coil current control unit 700.

In the first step S11, it is determined whether or not the coil current control unit 700 is connected to the charger. If the judgment here is affirmed, the process proceeds to step S12, and if denied, the process proceeds to step S13.

In step S12, the coil current is supplied. Specifically, the coil current control unit 700 sets a set value of the coil current amount at the time of charging (a pulse signal having the coil current value as the pulse amplitude and the supply time as the pulse width) at a predetermined time interval in the variable constant current circuit 400. (With a predetermined pulse period). At this time, the set value of the coil current amount is supplied from the variable constant current circuit 400 to the primary coil LP at predetermined time intervals. Each time the supply of the coil current amount is completed, the energy stored in the primary coil LP is transmitted to the secondary coil corresponding to at least one storage battery by the countercurrent energy, and the voltage difference between the storage batteries is reduced. When step S12 is executed, the process proceeds to step S14.

In step S13, the coil current control unit 700 sets a set value of the coil current amount at the time of discharge (a pulse signal having the coil current value as the pulse amplitude and the supply time as the pulse width) to the variable constant current circuit 400 at predetermined time intervals. Send (with a predetermined pulse period). At this time, the set value of the coil current amount is supplied from the variable constant current circuit 400 to the primary coil LP. When the supply of the coil current amount is completed, the energy stored in the primary coil LP is transmitted to the secondary coil corresponding to at least one storage battery by the countercurrent energy, and the voltage difference between the storage batteries is reduced. When step S13 is executed, the process proceeds to step S15.

In step S14, the coil current control unit 700 determines whether or not the balance time target value BTt-C at the time of charging has elapsed by timing the timer 900. If the judgment here is affirmed, the flow ends, and if denied, the process returns to step S12.

In step S15, the coil current control unit 700 determines whether or not the balance time target value BTt-DC at the time of discharge has elapsed by timing the timer 900. If the judgment here is affirmed, the flow ends, and if denied, the process returns to step S13.

Next, the cell balance control system of the second embodiment of the battery pack 1 of the first embodiment will be described with reference to FIG.

By the way, the balance time target value is repeatedly updated by the pre-cell balance process, but the power storage state adjustment process is not always performed immediately after the update. In that case, the power storage state of the assembled battery 100 (plurality) The remaining amount of the storage battery) changes, and the total amount of coil current to be supplied to the primary coil LP in order to balance the cells while suppressing the power loss changes.

Therefore, as shown in FIG. 10, the cell balance control system of the second embodiment is provided with a balance time target value correction unit 650.

The balance time target value correction unit 650 acquires the difference ΔV1 to ΔV3 of the battery voltages of the plurality of storage batteries from the voltage monitoring unit 500 during charging / discharging (preferably at the initial stage of charging), and balance time is a correction value of the target value. The time target value correction value BTt'is calculated and stored in the storage unit 800.

Here, the balance time target value setting unit 600 stores the difference ΔV1 to ΔV3 of the battery voltages of the plurality of storage batteries in the storage unit 800 in addition to the balance time target value BTt during the precell balance processing. That is, the balance time target values BTt and ΔV1 to ΔV3 are updated for each pull cell balance process.

Then, the balance time target value correction unit 650 stores the balance time target values BTt-C and BTt-DC at the time of charging and discharging, and the sum (former) of ΔV1 to ΔV3 at the start of charging / discharging in the storage unit 800. When it is larger than the sum of ΔV1 to ΔV3 (the latter) at the time of pre-cell balance processing, it is increased by the ratio of the former and the latter, and when it is smaller, it is decreased by the ratio of the former and the latter, and the obtained charge is obtained. The balance time target value correction value at the time of time and discharge is stored in the storage unit 800. When the former and the latter substantially match (for example, when the difference between the two is less than 3% of the average of the two), the balance time target value is not corrected.

Next, the storage state adjustment process by the cell balance control system of the second embodiment of the battery pack 1 of the first embodiment will be described with reference to the flowchart of FIG. This storage state adjustment process is performed at the start of charging / discharging of the battery pack 1 after the pre-cell balance process. Specifically, it is started by the coil current control unit 700 when the battery pack 1 is connected to the charger or the load. At this time, the timer 900 starts timing. In the following, for convenience, the storage state adjustment process at the time of charging / discharging will be collectively described without distinction.

In the first step S21, the balance time target value correction unit 650 sums the sums of ΔV1 to ΔV3 during charging / discharging (preferably at the initial stage of charging) and the sum of ΔV1 to ΔV3 during the precell balance processing stored in the storage unit 800. To compare.

In the next step S22, the balance time target value correction unit 650 determines whether or not the balance time target value needs to be corrected as described above. If the judgment here is affirmed, the process proceeds to step S23, and if denied, the process proceeds to step S24.

In step S23, the balance time target value correction unit 650 sets the balance time target value based on the ratio of the total sum of ΔV1 to ΔV3 during charging and the total sum of ΔV1 to ΔV3 during precell balance processing and the coil current amount set value. to correct.

In step S24, the coil current control unit 700 supplies a set value of the coil current amount.

In step S25, it is determined by timing the timer 900 whether or not the balance time target value has elapsed. If the judgment here is affirmed, the flow ends, and if denied, the process returns to step S24.

Next, the cell balance control system of the third embodiment of the first embodiment will be described with reference to FIG.

By the way, the balance time target value and the coil current amount set value are repeatedly updated by the pre-cell balance processing, but if the storage state adjustment processing is not performed immediately after the update, the storage state of the assembled battery 100 is stored from the time of the update. (Remaining amount of the plurality of storage batteries) changes, and the total amount of coil current to be supplied to the primary coil LP in order to balance the cells while suppressing the power loss changes.

Therefore, as shown in FIG. 12, the cell balance control system of the third embodiment is provided with the current sensor IS and the current monitoring unit 950.

The current sensor IS is connected in series with the primary coil LP and measures the current (coil current) flowing through the primary coil LP.

The measured value of the current sensor IS is sent to the current monitoring unit 950. The current monitoring unit 950 takes a difference ΔI between the current value of the coil current amount set value stored in the storage unit 800 during the precell balance processing and the measured value of the current sensor IS during charging / discharging (preferably at the initial stage of charging). It is stored in the storage unit 800.

The coil current control unit 700 calculates the coil current amount correction value based on the current upper limit value Imax, the balance time target value BTt, and the coil current amount set value stored in the storage unit 800, and stores the coil current amount correction value in the storage unit 800. To correct the coil current set value, the coil current set value (pulse amplitude), current supply time (pulse width), and supply time interval (pulse cycle), which are the current values of the coil current amount set value (pulse signal). You only need to change at least one.

Specifically, the coil current control unit 700 sets the coil current amount when the coil current amount during charging / discharging (the former) is larger than the coil current amount set value (the latter) during the precell balance processing. When it is small, it is decreased by the ratio of the former and the latter, and when it is small, it is increased by the ratio of the former and the latter, and the obtained coil current amount correction value at the time of charging and discharging is stored in the storage unit 800. When the former and the latter substantially match (for example, when the difference between the two is less than 3% of the average of the two), the coil current amount setting value is not corrected.

Next, the storage state adjustment process by the cell balance control system of the third embodiment of the battery pack 1 of the first embodiment will be described with reference to the flowchart of FIG. This storage state adjustment process is performed at the start of charging / discharging of the battery pack 1 after the pre-cell balance process. Specifically, it is started by the coil current control unit 700 when the battery pack 1 is connected to the charger or the load. At this time, the timer 900 starts timing. In the following, for convenience, the storage state adjustment process at the time of charging / discharging will be collectively described without distinction.

In the first step S31, the coil current control unit 700 supplies the set coil current amount.

In the next step S32, the current monitoring unit 950 acquires the measured value of the current sensor IS.

In the next step S33, the coil current control unit 700 determines whether or not the coil current set value needs to be corrected as described above. If the judgment here is affirmed, the process proceeds to step S34, and if denied, the process proceeds to step S36.

In step S34, the coil current control unit 700 corrects the coil current amount set value based on the difference ΔI between the coil current set value at the time of precell balance processing and the measured value of the current sensor IS during charging / discharging, and obtains the result. The coil current amount correction value is stored in the storage unit 800.

In the next step S35, the coil current control unit 700 supplies the coil current amount of the corrected set value.

In step S36, it is determined by timing the timer 900 whether or not the balance time target value has elapsed. If the judgment here is affirmed, the flow ends, and if it is denied, the same judgment is made again.

In the cell balance control system of the third embodiment, the coil current amount is corrected based on the measured value of the current sensor IS, but as in the cell balance control system of the fourth embodiment shown in FIG. 14, the pre-balance control system is used. The coil current amount set value may be corrected based on the ratio of the total sum of ΔV1 to ΔV3 during the cell balance processing and the total sum of ΔV1 to ΔV3 during charging and discharging.

Further, in the cell balance control system of the second embodiment, the balance time target value is corrected based on the measured values of the four voltage sensors, but it is similar to the cell balance control system of the fifth embodiment shown in FIG. In addition, the balance time target value may be corrected based on the value ΔI obtained by subtracting the coil current set value (latter) at the time of pre-cell balance processing from the measured value (the former) of the current sensor IS during charging / discharging. Specifically, when ΔI is positive and large, the balance time target value is decreased, when ΔI is negative and large, the balance time target value is increased, and when ΔI is approximately 0 (for example, the absolute value of ΔI is If it is less than 3% of the average of the former and the latter), no correction is made.

Hereinafter, the cell balance control system of the first embodiment of the battery pack 2 of the second embodiment will be described with reference to FIG.

As shown in FIG. 16, the cell balance control system of the first embodiment of the second embodiment is provided with four variable constant current circuits 400A to 400D corresponding to the four primary coil LP1 to LP4. However, it is different from the cell balance control system of the first embodiment.

Then, the coil current control unit 700 is at least four variable constant current circuits 400A to 400D based on ΔV1 to ΔV3 stored in the storage unit 800 by the precell balance process, the balance time target value BTt, and the current upper limit value Imax. The amount of coil current to be supplied to one is set, and the set value (coil current amount set value) is stored in the storage unit 800. Here, during charging / discharging, the coil current amount set from the variable constant current circuit is applied to the primary coil corresponding to the storage battery whose battery voltage is lower than the average value of the battery voltages of the four storage batteries in the precell balance processing. It is supplied until the balance time target value BTt has passed.

Hereinafter, the cell balance control system of the second embodiment of the battery pack 2 of the second embodiment will be described with reference to FIG.

As shown in FIG. 17, the cell balance control system of the second embodiment is provided with four variable constant current circuits 400A to 400D corresponding to the four primary coil LP1 to LP4. However, it is different from the cell balance control system of the second embodiment of the first embodiment.

Then, the coil current control unit 700 is at least four variable constant current circuits 400A to 400D based on ΔV1 to ΔV3 stored in the storage unit 800 by the precell balance process, the balance time target value BTt, and the current upper limit value Imax. The amount of coil current to be supplied to one is set, and the set value (coil current amount set value) is stored in the storage unit 800. Here, at the time of charging / discharging, the balance time target value BTt is corrected as necessary as in the second embodiment of the first embodiment, and the battery voltage corresponds to a storage battery whose battery voltage is lower than the average value of the battery voltages of the four storage batteries. The coil current amount set from the variable constant current circuit is supplied to the primary coil until the balance time target value has passed.

Hereinafter, the cell balance control system of the third embodiment of the battery pack 2 of the second embodiment will be described with reference to FIG.

In the cell balance control system of the third embodiment of the second embodiment, as shown in FIG. 18, four variable constant current circuits 400A to 400D corresponding to the four primary side coils LP1 to LP4 and four current sensors IS1 It is different from the cell balance control system of the third embodiment of the first embodiment in that ~ IS4 is provided.

Then, the coil current control unit 700 is at least four variable constant current circuits 400A to 400D based on ΔV1 to ΔV3 stored in the storage unit 800 by the precell balance process, the balance time target value BTt, and the current upper limit value Imax. The amount of coil current to be supplied to one is set, and the set value (coil current amount set value) is stored in the storage unit 800. Here, at the time of charging / discharging, the balance time target value BTt is corrected as necessary as in the third embodiment of the first embodiment, and the battery voltage corresponds to a storage battery whose battery voltage is lower than the average value of the battery voltages of the four storage batteries. The coil current amount set from the variable constant current circuit is supplied to the primary coil until the balance time target value has passed.

Hereinafter, the cell balance control system of the fourth embodiment of the battery pack 2 of the second embodiment will be described with reference to FIG.

As shown in FIG. 19, the cell balance control system of the fourth embodiment of the second embodiment is provided with four variable constant current circuits 400A to 400D corresponding to the four primary coil LP1 to LP4. However, it is different from the cell balance control system of the fourth embodiment of the first embodiment.

Then, the coil current control unit 700 is at least four variable constant current circuits 400A to 400D based on ΔV1 to ΔV3 stored in the storage unit 800 by the precell balance process, the balance time target value BTt, and the current upper limit value Imax. The amount of coil current to be supplied to one is set, and the set value (coil current amount set value) is stored in the storage unit 800. Here, at the time of charging / discharging, the coil current amount set value is corrected as necessary as in the fourth embodiment of the first embodiment, and the battery voltage corresponds to a storage battery whose battery voltage is lower than the average value of the battery voltages of the four storage batteries. The coil current amount set from the variable constant current circuit is supplied to the primary coil until the balance time target value has passed.

Hereinafter, the cell balance control system of the fifth embodiment of the battery pack 2 of the second embodiment will be described with reference to FIG.

In the cell balance control system of the fifth embodiment of the second embodiment, as shown in FIG. 20, four variable constant current circuits 400A to 400D corresponding to the four primary side coils LP1 to LP4 and four current sensors IS1 It is different from the cell balance control system of the fifth embodiment of the first embodiment in that ~ IS4 is provided.

Then, the coil current control unit 700 is at least four variable constant current circuits 400A to 400D based on ΔV1 to ΔV3 stored in the storage unit 800 by the precell balance process, the balance time target value BTt, and the current upper limit value Imax. The amount of coil current to be supplied to one is set, and the set value (coil current amount set value) is stored in the storage unit 800. Here, at the time of charging / discharging, the balance time target value is corrected as necessary as in the fifth embodiment of the first embodiment, and the primary corresponding to the storage battery whose battery voltage is lower than the average value of the battery voltages of the four storage batteries. The coil current amount set from the variable constant current circuit is supplied to the side coil until the balance time target value has passed.

The storage state adjusting device of the first and second embodiments described above is a storage state adjusting device for adjusting the storage state of the assembled battery 100 in which a plurality of (for example, four) storage batteries BAT1 to BAT4 are connected in series. , A primary coil connected in series with a plurality of storage batteries, a plurality of secondary coils connected in parallel with each of the plurality of storage batteries, and the energy stored in the primary coil is transmitted, and charging of the assembled battery 100. A target value of the balance time (balance time target value), which is the time from the start or the start of discharge to the balance of the voltages of a plurality of storage batteries, is set, and the total energy stored in the primary coil is based on the target value. It is equipped with a cell balance control system that adjusts.

In this case, by setting the balance time target value to an appropriate value, the total amount of energy stored in the primary coil for cell balance during charging / discharging can be reduced (preferably minimized).

As a result, it is possible to suppress an increase in the amount of energy loss (power loss amount), which is a value obtained by subtracting the amount of energy actually consumed for cell balance from the total amount of energy stored in the primary coil.

As a result, an increase in power loss (energy loss) during charging / discharging can be suppressed.

In short, in the first and second embodiments, setting the balance time target value means the total amount of energy stored in the primary coil for cell balance (coil current amount x number of supply times (pulse number)), and thus the total amount of energy stored in the primary coil. It is nothing but setting the amount of energy loss. That is, since the amount of energy loss changes depending on the setting of the balance time target value, it is very important to set the balance time target value appropriately.

That is, under the same condition of charging time or discharging time, the power loss at the time of charging / discharging can be minimized by appropriately setting the balance time target value.

Further, since it is not necessary to adopt a circuit configuration for unnecessarily increasing the amount of energy stored in the primary coil, it is possible to suppress an increase in the size of the device.

Further, the cell balance control system has a balance time so that the total amount of energy stored in the primary coil is equal to or less than a predetermined value within the range of the charge time CT or the discharge time DCT set in advance for the assembled battery 100. It is preferable to set a target value and adjust the total energy amount so as to be equal to or less than a predetermined value.

In this case, the balance time target value can be set to an appropriate value.

Further, the cell balance control system may set a balance time target value and set the total amount of energy stored in the primary coil based on the balance time target value when the assembled battery 100 is not charged or discharged. preferable.

In this case, cell balance can be achieved in advance. As a result, at the time of charging / discharging, the set total energy amount may be supplied to the primary coil from the start of charging or the start of discharging to the set balance time target value, which simplifies the control at the time of charging / discharging. can.

Further, the storage state adjusting device further includes a plurality of (for example, four) voltage sensors VS1 to VS4 for measuring the voltage of each of the plurality of storage batteries, and the cell balance control system has a balance time target value and outputs of the plurality of voltage sensors. It is preferable to adjust the total amount of energy stored in the primary coil based on the above.

In this case, since the total energy amount can be adjusted according to the balance time target value and the difference between the voltages of the plurality of storage batteries at the time of charging and discharging, the cell balance can be performed with high accuracy.

Further, it is preferable that the cell balance control system can change the setting of the balance time target value according to the measured values of a plurality of voltage sensors.

In this case, since the balance time target value setting can be changed according to the storage state of the storage battery, even if the storage state of the storage battery changes after the balance time target value is set, the total energy amount corresponding to the change is primary. Can be supplied to the side coil.

Further, the storage state adjusting device further includes a current sensor that measures the current supplied to the primary coil, and the cell balance control system is stored in the primary coil based on the balance time target value and the measured value of the current sensor. It is preferable to adjust the total amount of energy.

In this case, since the total energy amount can be adjusted according to the balance time target value and the current supplied to the primary coil during charging / discharging, cell balancing can be performed with high accuracy.

Further, in the second embodiment, a plurality of primary side coils are provided corresponding to the plurality of secondary side coils, and a plurality of current sensors are provided corresponding to the plurality of primary side coils.

In this case, since the currents supplied to the plurality of primary coils can be individually measured, the currents supplied to the plurality of primary coils can be individually adjusted according to the measured values.

Further, it is preferable that the cell balance control system can change the setting of the balance time target value according to the measured value of the current sensor.

In this case, since the balance time target value setting can be changed according to the storage state of the storage battery, even if the storage state of the storage battery changes after the balance time target value is set, the total energy amount corresponding to the change is primary. Can be supplied to the side coil.

Further, the cell balance control system preferably includes a variable constant current circuit connected to the primary coil.

In this case, the current can be stably supplied to the primary coil, and the current value of the current can be changed at any time.

Further, in the second embodiment, a plurality of primary side coils are provided corresponding to the plurality of secondary side coils, and a plurality of variable constant current circuits are provided corresponding to the plurality of primary side coils.

In this case, the current can be stably and individually supplied to the plurality of primary coils, and the current value of the current can be changed at any time.

Further, the battery packs 1 and 2 of the first and second embodiments include an assembled battery 100 in which a plurality of storage batteries are connected in series, and a stored state adjusting device for adjusting the stored state of the assembled battery 100. There is.

In this case, it is possible to provide a battery pack having excellent charge / discharge efficiency.

Further, according to the load system including the battery pack of the first or second embodiment, the charger connected to the battery pack, and the load connected to the battery pack, the energy efficiency of the entire system is improved. can do.

The storage state adjusting method of the first and second embodiments is a storage state adjusting method for adjusting the storage state of the assembled battery 100 in which a plurality of (for example, four) storage batteries BAT1 to BAT4 are connected in series. The primary coil is connected in series to the plurality of storage batteries, and the plurality of secondary coils to which the energy stored in the primary coil is transmitted are connected in parallel to each of the plurality of storage batteries. It is accumulated in the primary coil based on the step of setting the target value of the balance time (balance time target value), which is the time from the start of charging or the start of discharging to the balance of the voltages of the plurality of storage batteries, and the target value. Includes a step of adjusting the amount of energy.

In this case, the total amount of energy stored in the primary coil can be reduced by setting the balance time target value to an appropriate value.

As a result, an increase in power loss (energy loss) during charging / discharging can be suppressed.

Further, in the setting step, the balance time target is set so that the total amount of energy stored in the primary coil is equal to or less than a predetermined value within the range of the charging time CT or the discharging time DCT set in advance for the assembled battery 100. In the step of setting and adjusting the value, it is preferable to adjust the amount of energy so as to be equal to or less than a predetermined value.

In this case, the balance time target value can be set to an appropriate value.

Further, in the step of setting, the balance time target value is set at times other than when the assembled battery 100 is charged / discharged, and in the step of adjusting, the total is based on the balance time target value at times other than when the assembled battery 100 is charged / discharged. It is preferable to set the amount of energy.

In this case, cell balance can be achieved in advance. As a result, at the time of charging / discharging, the set total energy amount may be supplied to the primary coil from the start of charging or the start of discharging to the set balance time target value, which simplifies the control at the time of charging / discharging. can.

In each of the above embodiments, a variable constant current circuit is provided as an adjusting unit for adjusting the coil current, but the present invention is not limited to this, for example, a constant current source and a resistance circuit capable of switching the resistance value. A circuit including a variable resistance or a variable resistance may be provided, or a switching transistor that repeatedly connects and disconnects the primary coil and the assembled battery may be provided.

Further, the configuration of the variable constant current circuit is not limited to the configuration of the variable constant current circuits 400 and 400A to 400D, and can be appropriately changed.

Further, in the above embodiment, a flyback transformer is used as the current supply circuit, but the present invention is not limited to this, and other current adders may be used. Also in this case, it is preferable to control the current adder as the current supply circuit by the cell balance control system based on the balance time target value.

Further, in the above embodiment, the number of the storage battery, the primary coil, the secondary coil, the voltage sensor, and the current sensor constituting the assembled battery can be appropriately changed.

Further, in the above embodiment, the balance time target value is set at the time of pre-cell balance processing, but instead of or in addition to this, it may be set during charging / discharging or reset as necessary.

Further, in the above embodiment, the total amount of energy stored in the primary coil based on the balance time target value = coil current value (pulse amplitude) × supply time (pulse width) × number of supply times (number of pulses) is controlled. However, the present invention is not limited to this, and the coil current value, the coil current amount (coil current value × supply time), and the number of times of supply may be controlled by keeping the total amount of energy stored in the primary coil constant. Also in this case, the increase in power loss can be suppressed by keeping the coil current value, the coil current amount, and the number of times of supply from the start of charging or the start of discharging to the balance time target value below the threshold value. That is, by time-dispersing the current value, the amount of the current, and the supply time, the current value and the amount of the current can be controlled to be small (preferably the minimum), and an increase in energy loss and an increase in the size of the apparatus can be suppressed.

In addition, the specific numerical values, shapes, and the like used in the description of the above-described embodiment can be appropriately changed without departing from the spirit of the present invention.

The thinking process that led to the inventor's idea of the above embodiment will be described below.

Patent Document 1 discloses a cell balance method in which the charging current is adjusted for the purpose of making the cell voltages of a plurality of storage batteries connected in series in the power storage module the same voltage at the time of charging.

However, during high-speed charging and discharging, the power loss increases and the module becomes large.

Therefore, the inventor has devised the above embodiment in order to suppress an increase in energy loss at the time of cell balance and an increase in the size of the apparatus when charging and discharging a plurality of storage batteries at high speed.

1, 2 ... Battery pack, 100 ... Assembly battery, 400 ... Variable constant current circuit, 600 ... Balance time target value setting unit, 700 ... Coil current control unit, 800 ... Storage unit, V1 to V4 ... Voltage sensor, IS, IS1 ~ IS4 ... Current sensor.

JP-A-2015-154606

Claims (13)

It is a storage state adjustment device that adjusts the storage state of an assembled battery in which a plurality of storage batteries are connected in series.
A current supply circuit that supplies a current for balancing the voltages of the plurality of storage batteries to the assembled battery during charging / discharging of the assembled battery, and a current supply circuit.
A control system that sets a target value of the balance time, which is the time from the start of charging or discharging of the assembled battery to the balance of the voltages of the plurality of storage batteries, and controls the current supply circuit based on the target value. , Equipped with
The current supply circuit has a primary coil connected in series to the plurality of storage batteries and a plurality of secondary coils connected in parallel to each of the plurality of storage batteries to transmit the energy stored in the primary coil. Including the coil,
The control system sets the target value and sets the total amount of energy stored in the primary coil based on the target value when the assembled battery is not charged or discharged .
A storage state adjusting device , wherein the target value substantially matches a charging time or a discharging time preset for the assembled battery. It is a storage state adjustment device that adjusts the storage state of an assembled battery in which a plurality of storage batteries are connected in series.
A current supply circuit that supplies a current for balancing the voltages of the plurality of storage batteries to the assembled battery during charging / discharging of the assembled battery, and a current supply circuit.
A control system that sets a target value of the balance time, which is the time from the start of charging or discharging of the assembled battery to the balance of the voltages of the plurality of storage batteries, and controls the current supply circuit based on the target value. ,
A plurality of voltage sensors for measuring the voltage of each of the plurality of storage batteries are provided.
The current supply circuit has a primary coil connected in series to the plurality of storage batteries and a plurality of secondary coils connected in parallel to each of the plurality of storage batteries to transmit the energy stored in the primary coil. Including the coil,
The control system, Ri adjustable der the total amount of energy accumulated in the primary coil based on the target value and the measured value of said plurality of voltage sensors,
A storage state adjusting device , wherein the target value substantially matches a charging time or a discharging time preset for the assembled battery. The storage state adjusting device according to claim 2 , wherein the control system can change the setting of the target value according to the measured values of the plurality of voltage sensors. It is a storage state adjustment device that adjusts the storage state of an assembled battery in which a plurality of storage batteries are connected in series.
A current supply circuit that supplies a current for balancing the voltages of the plurality of storage batteries to the assembled battery during charging / discharging of the assembled battery, and a current supply circuit.
A control system that sets a target value of the balance time, which is the time from the start of charging or discharging of the assembled battery to the balance of the voltages of the plurality of storage batteries, and controls the current supply circuit based on the target value. , Equipped with
The current supply circuit has a primary coil connected in series to the plurality of storage batteries and a plurality of secondary coils connected in parallel to each of the plurality of storage batteries to transmit the energy stored in the primary coil. Including the coil,
Further equipped with a current sensor for measuring the current supplied to the primary coil,
The control system, Ri adjustable der the total amount of energy accumulated in the primary coil based on the target value and the measured value of said current sensor,
A storage state adjusting device , wherein the target value substantially matches a charging time or a discharging time preset for the assembled battery. A plurality of the primary side coils are provided corresponding to the plurality of secondary side coils.
The storage state adjusting device according to claim 4 , wherein a plurality of the current sensors are provided corresponding to the plurality of primary side coils. The control system, the state of charge controller according to claim 4 or 5, characterized in that in response to the measured value of the current sensor can change the setting of the target value. The storage state adjusting device according to any one of claims 1 to 6 , wherein the control system includes a variable constant current circuit connected to the primary coil. The storage state adjusting device according to claim 7 , wherein a plurality of the variable constant current circuits are provided corresponding to the plurality of primary side coils. An assembled battery in which multiple storage batteries are connected in series,
A battery pack comprising the storage state adjusting device according to any one of claims 1 to 8, which adjusts the storage state of the assembled battery. The battery pack according to claim 9 and
The charger connected to the battery pack and
A load system comprising a load connected to the battery pack. It is a storage state adjustment method that adjusts the storage state of an assembled battery in which multiple storage batteries are connected in series.
During charging / discharging of the assembled battery, a current for balancing the voltages of the plurality of storage batteries is supplied to the assembled battery from the current supply circuit.
The current supply circuit has a primary coil connected in series to the plurality of storage batteries and a plurality of secondary coils connected in parallel to each of the plurality of storage batteries to transmit the energy stored in the primary coil. Including the coil,
A step of setting a target value of a balance time, which is a time from the start of charging or discharging of the assembled battery to the balance of the voltages of the plurality of storage batteries, and
Including a step of controlling the current supply circuit based on the target value.
In the setting step, the target value is set at a time other than the charging / discharging of the assembled battery.
In the control step, the total amount of energy stored in the primary coil is set based on the target value when the assembled battery is not charged or discharged .
The target value is a storage state adjusting method that substantially matches the charging time or discharging time preset for the assembled battery. It is a storage state adjustment method that adjusts the storage state of an assembled battery in which multiple storage batteries are connected in series.
During charging / discharging of the assembled battery, a current for balancing the voltages of the plurality of storage batteries is supplied to the assembled battery from the current supply circuit.
The current supply circuit has a primary coil connected in series to the plurality of storage batteries and a plurality of secondary coils connected in parallel to each of the plurality of storage batteries to transmit the energy stored in the primary coil. Including the coil,
A step of setting a target value of a balance time, which is a time from the start of charging or discharging of the assembled battery to the balance of the voltages of the plurality of storage batteries, and
Including a step of controlling the current supply circuit based on the target value.
In the step of the control, Ri adjustable der the total amount of energy accumulated in the primary coil based on the measured value and the target value of the plurality of voltage sensor for measuring a plurality of storage batteries each voltage,
The target value is a storage state adjusting method that substantially matches the charging time or discharging time preset for the assembled battery. It is a storage state adjustment method that adjusts the storage state of an assembled battery in which multiple storage batteries are connected in series.
During charging / discharging of the assembled battery, a current for balancing the voltages of the plurality of storage batteries is supplied to the assembled battery from the current supply circuit.
The current supply circuit has a primary coil connected in series to the plurality of storage batteries and a plurality of secondary coils connected in parallel to each of the plurality of storage batteries to transmit the energy stored in the primary coil. Including the coil,
A step of setting a target value of a balance time, which is a time from the start of charging or discharging of the assembled battery to the balance of the voltages of the plurality of storage batteries, and
Including a step of controlling the current supply circuit based on the target value.
In the step of the control, Ri adjustable der the total amount of energy accumulated in the primary coil based on the measured value and the target value of the current sensor for measuring the current supplied to the primary coil,
A storage state adjusting method , wherein the target value substantially matches a charging time or a discharging time preset for the assembled battery.

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