WO2017183395A1 - Battery pack - Google Patents

Battery pack Download PDF

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Publication number
WO2017183395A1
WO2017183395A1 PCT/JP2017/012332 JP2017012332W WO2017183395A1 WO 2017183395 A1 WO2017183395 A1 WO 2017183395A1 JP 2017012332 W JP2017012332 W JP 2017012332W WO 2017183395 A1 WO2017183395 A1 WO 2017183395A1
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WO
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Patent type
Prior art keywords
battery
normal
voltage
module
modules
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Application number
PCT/JP2017/012332
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French (fr)
Japanese (ja)
Inventor
真一 会沢
隆広 都竹
順一 波多野
隆介 長谷
Original Assignee
株式会社豊田自動織機
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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/42Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/44Methods for charging or discharging
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/42Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48Accumulators combined with arrangements for measuring, testing or indicating condition, e.g. level or density of the electrolyte
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/02Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters

Abstract

When a battery module 2 that has returned to normal is to be reconnected to another battery module 2, and the voltage Vr of a battery B in the battery module 2 that has returned to normal is smaller than the voltage Vo of a battery B of the other battery module 2, the battery module 2 that has returned to normal is reconnected to the other battery module 2 once the voltage Vo of the battery B of the other battery module 2 has reached a predetermined voltage Vf and the voltage difference ΔV between the voltage Vr of the battery B of the battery module 2 that has returned to normal and the voltage of the battery B of the other battery module 2 has reached or fallen below a predetermined value ΔVth.

Description

Battery pack

The present invention relates to a battery pack.

As an existing battery pack, comprising a plurality of battery modules connected in parallel to each other, electricity when the battery module out of a plurality of battery modules becomes abnormal, the battery module becomes the abnormality from the other battery modules disconnect the manner, there is to continue the power supply to the load only by the other battery modules.

In thus constructed battery pack, the voltage difference between the battery module is increased, with an increase of the voltage difference, also increases the return current flowing between the battery modules. Therefore, to return to the battery module becomes abnormal is normal, when reconnecting the battery module has returned to its normal to other battery modules, corresponding to the voltage difference between the battery module and another battery module that returned to normal When the return current to greater than the rated current of each component, such as a battery, a switch and electrical wires constituting the battery module, there is a risk that they components or faulty deteriorated by the return current.

Therefore, in order to suppress the return current corresponding to the voltage difference between the battery module and another battery module returns to normal, the voltage of the battery with the battery voltage and other battery modules having battery modules returned to normal Doo is when nearly becomes the same voltage, it is conceivable to reconnect the battery module that has returned to normal the other battery modules.

For example, when reconnecting the battery module returned to normal other battery modules, and, in case the voltage of the battery included in the battery module has returned to normal is greater than the voltage of the battery having other battery modules, other battery module increases the voltage of the battery other battery modules have by charging the battery with is substantially equal to the voltage of the battery with the battery voltage and other battery modules having battery modules returned to normal it can be considered to the voltage.

Further, for example, when reconnecting the battery module returned to normal other battery modules, and, in case the voltage of the battery included in the battery module has returned to normal is smaller than the voltage of the battery having other battery modules , reduce the voltage of the battery having other battery modules by discharging a battery having other battery modules and the voltage of the battery with the battery voltage and other battery modules having battery modules returned to normal it is conceivable to substantially the same voltage.

As a related technology, for example, there is Patent Document 1.

JP 2008-220104 JP

However, when reconnecting the battery module returned to normal other battery modules, and, when the voltage of the battery included in the battery module has returned to normal is smaller than the voltage of the battery having other battery module, the battery pack When There is charging, thereby it is not possible to discharge the battery having other battery module, substantially the same voltage and the voltage of the battery with the battery voltage and other battery modules having battery modules returned to normal you can not, can not be reconnected to the other battery modules of the battery module that has returned to normal while suppressing the circulating current.

SUMMARY According to one aspect of the present invention is a battery pack with a plurality of battery modules connected in parallel to each other, increasing the chance of re-connecting the battery modules returned to normal while suppressing the circulating current in the other battery modules it is possible to achieve.

Battery pack, which is one form of the present invention includes a plurality of battery modules, and a control unit.

A plurality of battery modules each have a battery and a switch connected in series, are connected in parallel to each other.

Control unit, among the plurality of battery modules, by turning off the switch with the battery module becomes abnormal, disconnect the battery module becomes abnormal from other battery modules.

The control unit includes a battery module becomes abnormal is returned to normal, when reconnecting the battery module has returned to its normal to other battery modules, and the voltage of the battery included in the battery module has returned to normal is smaller than the voltage of the battery having other battery modules, after the voltage of the battery having other battery modules reaches a predetermined voltage by charging the battery with the other battery modules, the switch having other battery modules the causes off, to turn on the switch with the battery modules returned to normal, the battery voltage and other battery modules having battery modules returned to normal by then charging the battery with the battery modules returned to normal after the voltage difference between the voltage of the battery included in falls below a predetermined value, the scan with the other battery modules The pitch by turning on to connect the battery module and another battery module has returned to normal.

According to the present invention, it is possible to increase the opportunity to re-connect the battery pack with a plurality of battery modules, battery modules returned to normal while suppressing the circulating current in the other battery modules connected in parallel to each other.

Is a diagram illustrating an example of a battery pack of the embodiment. It is a diagram for explaining the constant-current constant-voltage charging control. Is a flow chart showing an example of the operation of the control unit. It is a flow chart showing another example of the operation of the control unit. It is a flowchart showing a modified example of the operation of the control unit shown in FIG. It is a flowchart showing a modified example of the operation of the control unit shown in FIG. It is a flowchart showing a modified example of the operation of the control unit shown in FIG. It is a flowchart showing a modified example of the operation of the control unit shown in FIG.

It will be described in detail embodiments based on the following drawings.

Figure 1 is a diagram showing an example of a battery pack of the embodiment.

The battery pack 1 shown in FIG. 1 includes a plurality of battery modules 2 are connected in parallel, and a control unit 3. The control unit 3 is, for example, CPU composed of (Central Processing Unit) and programmable devices. The battery pack 1 is, for example, is mounted on a vehicle such as an electric forklifts and hybrid cars, when the load Lo such as an inverter for driving a driving motor is connected to supply power to the load Lo. The battery pack 1, when the load Lo or charger Ch is connected, power is supplied from the load Lo or charger Ch.

Each battery module 2, respectively, and the battery B, a switch SW, a current detecting section 21, a temperature detecting section 22, and a monitoring unit 23.

Battery B is composed of a plurality of batteries connected in series (for example, a lithium ion battery, a nickel hydrogen battery or electric double layer capacitor). The battery B may be configured by a single battery.

Switch SW is composed of, for example, a MOSFET (Metal Oxide Semiconductor Field Effect Transistor) semiconductor relay or an electromagnetic relay, such as, are connected in series to the battery B. When the switch SW is turned on, the battery module 2 having the switch SW is connected the other battery modules 2 electrically switch SW is turned on. When the regenerative power from the load Lo to the battery pack 1 is supplied, or, when the power from the charger Ch to the battery pack 1 is supplied, charging battery B with the battery module 2 switch SW is turned on is, the voltage of the battery B rises. Also, the switch SW is turned off, the battery module 2 having the switch SW is electrically separated from the other battery modules 2 switch SW is turned on. In the example shown in FIG. 1, but the switch SW is connected to the negative terminal side of the battery B, the switch SW may be connected to the positive terminal side of the battery B.

Current detecting section 21 is composed of, for example, a Hall element or a shunt resistor, detects a current flowing through the battery B and the switch SW.

Temperature detection unit 22 is, for example, is constituted by a thermistor, for detecting the ambient temperature of the battery B.

Monitoring unit 23 is composed of, for example, a CPU and programmable devices, to detect the voltage of the battery B. The monitoring unit 23, an instruction sent from the control unit 3 controls ON switch SW, the OFF. The monitoring unit 23 sends the voltage of the battery B, the current detected by the current detection unit 21, and a battery status information indicating the temperature detected by the temperature detector 22 to the control unit 3.

Control unit 3, a voltage shown in the battery state information, current, and when at least one is above the threshold value of the temperature, the battery module 2 in the feed source of the battery status information is determined to be abnormal. The control unit 3, a voltage shown in the battery state information, current, and when the temperature is lower than both thresholds, the battery module 2 in the feed source of the battery status information is determined to be normal. The control unit 3, by turning off the switch SW included in the battery module 2 becomes abnormal, electrically disconnecting the battery module 2 from the other battery modules 2.

The control unit 3, to charge the battery B by performing constant-current constant-voltage charging control. That is, the control unit 3, as shown in FIG. 2 (a) and 2 (b), until the voltage V detected by the monitoring unit 23 from the start of charging is increased to a predetermined voltage Vf, the current detecting section 21 as current I detected is kept at a predetermined current by, by charging the battery B by performing constant-current charging control sending a current command value to the charger Ch, the voltage V detected by the monitoring unit 23 is predetermined until the current I detected by the current detection unit 21 from the raised to the voltage Vf decreases termination current If that corresponds to the charge amount of the target battery B, voltage V is the predetermined voltage detected by the monitoring unit 23 as it kept vf, to charge the battery B by performing constant-voltage charging control to send a current command value to the charger Ch. The predetermined voltage Vf and end current If may allowing some latitude in consideration of variations in the full-charge capacity of the battery B.

The control unit 3 returns to the normal cell module 2 becomes abnormal, when reconnecting the battery module 2 has returned to its normal to other battery modules 2, and the battery module 2 is returned to normal when the voltage Vr of the battery B is greater than the voltage Vo of the battery B with the other battery modules 2 with the voltage of the battery B with the other battery modules 2 by charging the battery B with the other battery modules 2 Vo after became voltage Vr of the battery B with the battery module 2 back to normal, the battery module 2 and the other battery module 2 back to normal by turning on the switch SW included in the battery module 2 back to normal to connect. The voltage Vo, when the other battery modules 2 there are a plurality, the average voltage of the voltage of the battery B to which they battery module 2 has.

The control unit 3 returns to the normal cell module 2 becomes abnormal, when reconnecting the battery module 2 has returned to its normal to other battery modules 2, and the battery module 2 is returned to normal when the voltage Vr of the battery B is smaller than the voltage Vo of the battery B with the other battery modules 2 with the voltage of the battery B with the other battery modules 2 by charging the battery B with the other battery modules 2 Vo after There reaches a predetermined voltage Vf, with turn off the switch SW with the other battery modules 2, to turn on the switch SW included in the battery module 2 back to normal, then the battery with the battery module 2 back to normal after the voltage Vr of the battery B with the battery module 2 back to normal by charging the B has reached a predetermined voltage Vf, other cell model Yuru 2 to connect the battery module 2 and the other battery module 2 back to normal by turning on the switch SW with.

The control unit 3 returns to the normal cell module 2 becomes abnormal, when reconnecting the battery module 2 has returned to its normal to other battery modules 2, and the battery module 2 is returned to normal when the voltage Vr of the battery B with is the same as the voltage Vo of the battery B with the other battery modules 2, after turn on the switch SW included in the battery module 2 returns to normal, the battery module 2 is returned to normal charging the battery B to the battery B and the other battery module 2 having has.

Figure 3 is a flow chart showing an example of the operation of the control unit 3. The switch SW that all the battery modules 2 with is assumed to be turned on. Further, the voltage of the battery B that all battery modules 2 have to be lower than the predetermined voltage Vf.

First, the control unit 3, when all of the battery modules 2 are determined to be normal (S301: No), maintains the current state, at least one of the battery modules 2 of all of the battery modules 2 When it is determined that an abnormal (S301: Yes), electrically disconnecting the battery module 2 becomes abnormal by turning off the switch SW having the battery module 2 became the abnormality from the other battery modules 2 (S302) .

Next, the control unit 3, when it is determined that the battery module 2 became the abnormality not returned yet normal (S303: No), maintains the current state, the battery module 2 becomes abnormal determining that returned to normal (S303: Yes), when the voltage Vr of the battery B with the battery module 2 back to normal is determined to be larger than the voltage Vo of the battery B with the other battery modules 2 (S304: Yes) to raise the voltage Vo by charging the battery B with the other battery module 2 by performing constant-current charging control. At this time, the switch SW included in the battery module 2 back to normal is off, since the battery B is not charged by the constant current charging control with the battery module 2 returns to normal, the voltage Vr is not increased.

Next, the control unit 3, when a voltage Vo is determined not to be increased to the voltage Vr (S306: No), maintains the current state, when the voltage Vo is determined to have increased to the voltage Vr (S306 : Yes), to connect the battery module 2 and the other battery module 2 back to normal by turning on the switch SW included in the battery module 2 back to normal (S307). At this time, since the voltage Vr and the voltage Vo becomes substantially the same, it is possible to reconnect the battery module 2 back to normal while suppressing the circulating current in the other battery modules 2. Further, in S307, when the battery module 2 and the other battery module 2 switch SW is returned to normal ON with the battery module 2 has returned to normal to connect the battery B and a battery module 2 back to normal since the cell B having the other battery modules 2 is charged by the constant current charging control, voltage Vr, Vo increases.

Next, the control unit 3, when the voltage Vr, Vo is determined not to rise to a predetermined voltage Vf (S308: No), maintains the current state, increases the voltage Vr, Vo until the predetermined voltage Vf If it is determined that the (S308: Yes), terminates the constant current charging control, charging the battery B with the battery B and the other battery module 2 having the battery module 2 back to normal by performing the constant voltage charging control (S309). The predetermined voltage Vf is the same as a constant voltage when the constant-voltage charging control, may not be exactly the same.

The control unit 3, the battery module 2 becomes abnormal, it is determined that returned to normal (S303: Yes), when the voltage Vr is determined to be smaller than the voltage Vo (S304: No, S310: Yes), a constant current raising the voltage Vo by charging the battery B with the other battery modules 2 by charging control (S311). At this time, the switch SW included in the battery module 2 back to normal is off, since the battery B is not charged by the constant current charging control with the battery module 2 returns to normal, the voltage Vr is not increased.

Next, the control unit 3, when a voltage Vo is determined not to have increased to a predetermined voltage Vf (S312: No), maintains the current state, when the voltage Vo is determined to have increased to a predetermined voltage Vf (S312: Yes), with turns off the switch SW with the other battery modules 2 to turn on the switch SW has battery module 2 back to normal (S313). Then, the battery B having the battery module 2 back to normal is charged by the constant current charging control, the voltage Vr rises. At this time, the switch SW with the other battery modules 2 are turned off, since the battery B with the other battery modules 2 are not charged, the voltage Vo is not increased.

Next, the control unit 3, when the voltage Vr is determined not to have increased to a predetermined voltage Vf (S314: No), maintains the current state, when the voltage Vr is determined to have increased to a predetermined voltage Vf (S314: Yes), it terminates the constant current charging control, by turning on the switch SW with the other battery modules 2, so as to connect the battery module 2 and the other battery module 2 back to normal (S315). In this case, the voltage Vr is a predetermined voltage Vf, the voltage Vo is a predetermined voltage Vf, because the voltage Vr and the voltage Vo becomes substantially the same, the battery module 2 and another battery returned to normal while suppressing the circulating current it can be re-connected to the module 2.

Next, the control unit 3, after reconnecting the battery module 2 has returned to normal at S315 to other battery modules 2, battery B and a battery module 2 back to normal by performing the constant voltage charging control charging the battery B with the other battery modules 2 (S309).

The control unit 3, the battery module 2 becomes abnormal, it is determined that returned to normal (S303: Yes), when the voltage Vr is determined to be the same as the voltage Vo (S304: No, S310: No), normal to turn on the switch SW has battery module 2 back to (S316). At this time, since the voltage Vr and the voltage Vo becomes substantially the same, it is possible to reconnect the battery module 2 back to normal while suppressing the circulating current in the other battery modules 2.

Then, the control unit 3, to charge the battery B with the battery B and the other battery module 2 having the battery module 2 back to normal by performing the constant current and constant voltage charging control (S317).

Figure 4 is a flow chart showing another example of the operation of the control unit 3. The switch SW that all the battery modules 2 with is assumed to be turned on. Further, the voltage of the battery B that all battery modules 2 have to be lower than the predetermined voltage Vf. Further, S401 ~ 409 shown in FIG. 4 are the same as S301 ~ S309 shown in FIG. 3, the description thereof is omitted.

Control unit 3, the battery module 2 becomes abnormal, it is determined that returned to normal (S403: Yes), the voltage Vr of the battery B with the battery module 2 back to the normal of the battery B with the other battery modules 2 If it is determined to be smaller than the voltage Vo (S404: No, S410: Yes), by charging the battery B to the other battery module 2 has by performing constant-current constant-voltage charging control, the voltage Vo to a predetermined voltage Vf after raising, lowering current Io flowing through the battery B with the other battery modules 2 (S411). At this time, the switch SW included in the battery module 2 back to normal is off, since the battery B is not charged by the constant current and constant voltage charging control with the battery module 2 returns to normal, the voltage Vr does not increase.

Next, the control unit 3, when the current Io is determined not to be reduced until the end current If (S412: No), maintaining the current status, if it is determined that the current Io is lowered until the end current If (S412: Yes), with turns off the switch SW with the other battery modules 2 to turn on the switch SW has battery module 2 back to normal (S413).

Next, the control unit 3, by charging the battery B in which the battery module 2 back to normal by performing the constant-current constant-voltage charging control has, after raising the voltage Vr to a predetermined voltage Vf, the current Ir reducing (S414). At this time, the switch SW with the other battery modules 2 are turned off, since the battery B with the other battery modules 2 are not charged by the constant current and constant voltage charging control, voltage Vo is not increased.

Next, the control unit 3, when the current Ir is determined not to be reduced until the end current If (S415: No), maintaining the current status, if it is determined that the current Ir is decreased until the end current If (S415: Yes), by turning on the switch SW with the other battery modules 2, so as to connect the battery module 2 and the other battery module 2 back to normal (S416). In this case, the voltage Vr is a predetermined voltage Vf, the voltage Vo is a predetermined voltage Vf, because the voltage Vr and the voltage Vo becomes substantially the same, the battery module 2 and another battery returned to normal while suppressing the circulating current it can be re-connected to the module 2.

The control unit 3, the battery module 2 becomes abnormal, it is determined that returned to normal (S403: Yes), when the voltage Vr is determined to be the same as the voltage Vo (S404: No, S410: No), normal to turn on the switch SW has battery module 2 back to (S417). At this time, since the voltage Vr and the voltage Vo becomes substantially the same, it is possible to reconnect the battery module 2 back to normal while suppressing the circulating current in the other battery modules 2.

Then, the control unit 3, to charge the battery B with the battery B and the other battery module 2 having the battery module 2 back to normal by performing the constant current and constant voltage charging control (S418).

That is, the control unit 3 for performing the operation shown in FIG. 3, when reconnecting the battery module 2 has returned to normal the other battery modules 2, and the voltage Vr of the battery B with the battery module 2 back to normal in case but smaller than the voltage Vo of the battery B with the other battery modules 2, when charging the battery B with the other battery modules 2, a constant current charge control, battery included in the battery module 2 back to normal when charging the B, a constant current charge control, after reconnecting the battery module 2 has returned to normal the other battery modules 2, battery B and the other battery module 2 having the battery module 2 back to normal when charging the battery B that has, the constant voltage charging control.

The control unit 3 for performing the operation shown in FIG. 4, when reconnecting the battery module 2 has returned to normal the other battery modules 2, and the voltage Vr of the battery B with the battery module 2 back to normal in case but smaller than the voltage Vo of the battery B with the other battery modules 2, when charging the battery B with the other battery modules 2, a constant current constant voltage charging control, the battery module 2 back to normal when charging the battery B having performs constant-current constant-voltage charging control.

Thus, in the battery pack 1 of the embodiment, when reconnecting the battery module 2 has returned to normal the other battery modules 2, and, when the voltage Vr is smaller than the voltage Vo, the other battery modules 2 after the voltage Vo to a predetermined voltage Vf by charging the battery B with, and the voltage Vr to a predetermined voltage Vf by charging the battery B having the battery module 2 back to normal. Thus, when reconnecting the battery module 2 has returned to normal the other battery modules 2, and, when the voltage Vr is smaller than the voltage Vo, be a battery pack 1 is being charged, the voltage Vr, Vo the each to a predetermined voltage Vf, it is possible to substantially the same voltage and the voltage Vr and the voltage Vo, it is possible to reconnect the battery module 2 back to normal while suppressing the circulating current in the other battery modules 2 . That is, according to the battery pack 1 of the embodiment, it is possible to increase the opportunity to reconnect the battery module 2 back to normal while suppressing the circulating current in the other battery modules 2.

However, unlike the battery pack 1 of the embodiment, when reconnecting the battery module 2 has returned to normal the other battery modules 2, and, when the voltage Vr is smaller than the voltage Vo, the battery module 2 back to normal after raising the voltage Vr to a predetermined voltage Vf by charging the battery B that has, but configured to raise the voltage Vo to a predetermined voltage Vf is also conceivable by charging the battery B with the other battery modules 2, If such a configuration, and, in the case where the number of battery modules 2 which has returned to normal is less than the number of the other battery modules 2, the charging of the battery pack 1 is terminated prematurely, the battery pack 1 as a whole charge since the charge of leaving the battery pack 1 amount does not increase too much is finished, physical disorder, such as the amount of increase in the amount of charge of the battery pack 1 is not accompanied by the charging time The there is a possibility that the user will remember.

On the other hand, in the battery pack 1 of the embodiment, when reconnecting the battery module 2 has returned to normal the other battery modules 2, and, when the voltage Vr is smaller than the voltage Vo, the other battery module 2 has battery after the voltage Vo to a predetermined voltage Vf by charging the B, because it a voltage Vr to a predetermined voltage Vf by charging the battery B having the battery module 2 returns to normal, the battery module 2 back to normal in case the number of is less than the number of the other battery modules 2, be terminated prematurely charging the battery pack 1, can increase the amount of charge of the entire battery pack 1 sufficiently, the amount of charge of the battery pack 1 it is possible that the amount of increase to as not to remember the user a sense of discomfort, such as not accompanied with the charging time.

Further, the present invention is not limited to the above embodiments, and various improvements without departing from the gist of the present invention, modifications are possible.

5 and 6 are flowcharts showing a modification of the operation of the control section 3 shown in FIG. The switch SW that all the battery modules 2 with is assumed to be turned on. Further, the voltage of the battery B that all battery modules 2 have to be lower than the predetermined voltage Vf. Further, S501 ~ 509 shown in FIG. 5 are the same as S301 ~ S309 shown in FIG. 3, the description thereof is omitted. Further, S517 ~ S518 shown in FIG. 5 are the same as S316 ~ S317 shown in FIG. 3, the description thereof is omitted.

5, the control unit 3 determines that the battery module 2 becomes abnormal is returned to normal (S503: Yes), the voltage Vr other battery cells B having the battery module 2 back to normal If it is determined to be smaller than the voltage Vo of the battery B which module 2 has (S504: No, S510: Yes), it is determined whether the voltage Vr is equal to or less than the threshold value Vth (S511). The threshold value Vth is, for example, a voltage of the battery B as just before the over-discharge.

Next, the control unit 3 determines that the voltage Vr is greater than the threshold value Vth (S511: No), the process proceeds to S512. S512 and subsequent steps are the same as S311 and subsequent steps in FIG. 3, the description thereof is omitted.

Next, the control unit 3 determines that the voltage Vr is equal to or less than the threshold value Vth (S511: Yes), as shown in FIG. 6, the turn off the switch SW with the other battery modules 2, returned to normal to turn on the switch SW included in the battery module 2 (S519), raising the voltage Vr by charging the battery B having the battery module 2 back to normal by performing constant-current charging control (S520). At this time, the switch SW with the other battery modules 2 are turned off, since the battery B with the other battery modules 2 are not charged by the constant current charge control voltage Vo is not increased.

Next, the control unit 3, when the voltage Vr is determined not have the same or substantially the same as the voltage Vo (S521: No), maintains the current state, the same or substantially the voltage Vr to the voltage Vo If it is determined to have become the same (S521: Yes), by turning on the switch SW with the other battery modules 2, so as to connect the battery module 2 and the other battery module 2 back to normal (S522). At this time, since the voltage Vr and the voltage Vo is the same or substantially the same, it is possible to reconnect the battery module 2 back to normal while suppressing the circulating current in the other battery modules 2.

Next, the control unit 3, as shown in FIG. 5, to charge the battery B with the battery B and the other battery module 2 having the battery module 2 back to normal by performing the constant voltage charging control (S509) .

That is, the control unit 3 for performing the operation shown in FIGS. 5 and 6, the return to normal the battery module 2 becomes abnormal, when reconnecting the battery module 2 has returned to its normal to other battery modules 2, and, when the voltage Vr of the battery B with the battery module 2 has returned to normal is smaller than the voltage Vo of the battery B with the other battery modules 2, and, when the voltage Vr is equal to or less than the threshold value Vth, the other battery with turn off the switch SW module 2 has to turn on the switch SW included in the battery module 2 back to normal, by charging the battery B having the battery module 2 returns to normal, the battery module 2 back to normal the same or becomes substantially equal to the voltage Vo of the battery B to voltage Vr of the battery B has the other battery modules 2 with the other battery modules 2 To connect the battery module 2 and the other battery module 2 back to normal by turning on the switch SW with.

Thus, when the voltage Vr of the battery B with the battery module 2 back to normal is equal to or less than the threshold Vth, the battery B having the battery module 2 has returned to normal before the cell B having the other battery modules 2 to be charged, while battery B having the battery module 2 has returned to normal even accidentally ended prematurely charging the battery pack 1 when it is over-discharged slightly, will not charge the battery B of the over-discharge Pounds it is left becomes overdischarge can be suppressed.

Further, in S313 of FIG. 3, when the switch SW included in the battery module 2 back to normal is turned on, the battery B having the battery module 2 back to normal by the constant current charging control is charged, the voltage Vr rises. Further, in S313 of FIG. 3, when the switch SW with the other battery modules 2 are turned off, the voltage component which is the integrated value of the current flowing to the battery B with the other battery modules 2 and the internal resistance of the battery B , the voltage Vo drops below the predetermined voltage Vf. The switch SW included in the different cell module 2 after turning off, because we are resolving the polarization of the battery B with the other battery modules 2, the voltage Vo gradually falls. Therefore, in S314 of FIG. 3, when the voltage Vr rises to a predetermined voltage Vf, the voltage difference between the voltage Vr and the voltage Vo generated.

Therefore, as shown in FIG. 3, when it is determined that "voltage Vr rises to a predetermined voltage Vf (S314: Yes), by turning on the switch SW with the other battery modules 2, returned to normal cell the operation of the control unit 3 of the module 2 and to connect the other a battery module 2 (S315) ", as shown in FIG. 7, when the voltage difference ΔV between the" voltage Vr and the voltage Vo is equal to or less than a predetermined value ΔVth Judging (S314': Yes), by turning on the switch SW with the other battery modules 2, so as to connect the battery module 2 and the other battery module 2 back to normal (S315) "the controller 3 that it can be replaced in operation.

That is, the control unit 3 for performing the operation shown in FIG. 7, the process returns to normal battery module 2 becomes abnormal, when reconnecting the battery module 2 has returned to its normal to other battery modules 2, and, normal when the voltage Vr of the battery B that has a battery module 2 back to less than the voltage Vo of the battery B with the other battery modules 2, the other battery modules by charging the battery B with the other battery modules 2 2 after formation of a voltage Vo is a predetermined voltage Vf of the battery B which has, together with the turn off the switch SW with the other battery modules 2, to turn on the switch SW has battery module 2 back to normal, then returned to normal voltage Vr of the battery B with the battery module 2 back to normal by charging the battery B in which the battery module 2 has the other battery modular After the voltage difference ΔV between the voltage Vo of Lumpur 2 is equal to or less than a predetermined value [Delta] Vth, to connect the other and the battery module 2 cell module back to normal by turning on the switch SW with the other battery modules 2 .

In the case of replacing the S314' shown in FIG. 7 the S314 shown in FIG. 3, the control unit 3, when turning on the switch SW with the other battery modules 2 (S315), and shall not exit the constant current charging control . Also, when replacing the S314' shown in FIG. 7 the S314 shown in FIG. 3, the control unit 3, after turning on the switch SW with the other battery modules 2 (S315), instead of the operation of S309, the operation of S308 it is assumed that the transition to.

That is, the control unit 3 for performing the operation shown in FIG. 7, when charging the battery B with the other battery modules 2, a constant current charging control, when charging the battery B having the battery module 2 back to normal , a constant current charge control, after reconnecting the battery module 2 has returned to normal the other battery module 2, a battery B with a battery B and the other battery module 2 having the battery module 2 back to normal when to charge, the constant voltage charging control after the constant current charging control.

The predetermined value ΔVth may be zero, and the variation of the voltage detection accuracy of the monitoring unit 23 may be non-zero value in consideration of. By a predetermined value ΔVth zero or substantially zero, when reconnecting the battery module 2 has returned to normal the other battery modules 2, since it is possible to make the voltage Vr and the voltage Vo to each other the same or substantially the same , it is possible to suppress the return current.

Also, similarly, when the "voltage Vr shown in FIG. 5 is determined to have increased to a predetermined voltage Vf (S515: Yes), by turning on the switch SW with the other battery modules 2, battery modules 2 which returned to normal and the operation of the control unit 3 that to connect the other battery modules 2 (S516) ", as shown in FIG. 8, when it is determined that the voltage difference ΔV between the" voltage Vr and the voltage Vo is equal to or less than a predetermined value ΔVth (S515': Yes), by turning on the switch SW with the other battery modules 2, the operation of the control unit 3 of the normal and the battery module 2 back to to connect other and the battery module 2 (S516) " it is also possible to replace.

In the case of replacing the S515' shown in FIG. 8 the S515 shown in FIG. 5, the control unit 3, when turning on the switch SW with the other battery modules 2 (S516), and shall not exit the constant current charging control . Also, when replacing the S515' shown in FIG. 8 the S515 shown in FIG. 5, the control unit 3, after turning on the switch SW with the other battery modules 2 (S516), instead of the operation of S509, the operation of S508 it is assumed that the transition to. Further, in FIG. 8, the control unit 3 determines that the voltage Vr is equal to or less than the threshold value Vth (S511: Yes), it is assumed that shifts to S519 shown in FIG.

That is, the control unit 3 for performing the operation shown in FIG. 8, returned to normal the battery module 2 becomes abnormal, when reconnecting the battery module 2 has returned to its normal to other battery modules 2, and, normal battery when the voltage Vr of the battery B in which the module 2 has is smaller than the voltage Vo of the battery B with the other battery modules 2, and the threshold voltage Vr of the battery B with the battery module 2 back to normal returned to when greater than Vth, after the voltage Vo of the battery B with the other battery modules 2 reaches a predetermined voltage Vf by charging the battery B with the other battery modules 2, the switch SW with the other battery modules 2 causes off and to turn on the switch SW included in the battery module 2 back to normal, then the battery with the battery module 2 back to normal After the voltage difference ΔV between the voltage Vo of the battery B having a voltage Vr and other battery modules 2 of cell B having the battery module 2 back to normal is equal to or less than a predetermined value ΔVth by charging the other battery by turning on the switch SW module 2 has to connect the battery module 2 and the other battery module 2 back to normal.

1 battery pack 2 battery module 3 controller 21 a current detector 22 temperature detector 23 monitor Lo load Ch charger B cell SW switch

Claims (6)

  1. Each have a battery and a switch which are connected in series, and a plurality of battery modules connected in parallel to each other,
    Among the plurality of battery modules, by turning off the switch with the battery module becomes abnormal, and a control unit for disconnecting the battery module becomes the abnormality from the other battery modules,
    Equipped with a,
    Wherein the control unit returns to normal battery module becomes the abnormality, when reconnecting the battery module has returned to its normal to the other battery modules, and a battery having the battery module returns to the normal when the voltage lower than the voltage of the battery having said other battery modules, after the voltage of the battery having said other battery modules reaches a predetermined voltage by charging the battery the other battery module has, the other with turn off the switch with the battery module, the turns on the switch with the battery modules returned to normal, then cell module back to normal the by charging the battery with said battery modules returned to normal voltage difference between the voltage of the battery with the voltage and the other battery module of the battery is below a predetermined value with After becoming the battery pack, characterized in that to connect the other battery modules returned to the normal by turning on a switch included in the battery module and the other battery modules.
  2. A battery pack according to claim 1,
    Wherein, when charging the battery the other battery module has, a constant current charging control, when charging the battery with said battery modules returned to normal, a constant current charge control, the normally after re-connecting the battery modules returned to the other battery modules, when charging the battery with the battery and the other battery module the battery module returns to normal has a constant after the constant current charging control battery pack and performs voltage charging control.
  3. A battery pack according to claim 1,
    Wherein the control unit returns to normal battery module becomes the abnormality, when reconnecting the battery module has returned to its normal to the other battery modules, and a battery having the battery module returns to the normal when the voltage lower than the voltage of the battery having said other battery modules, after the voltage of the battery having said other battery modules reaches a predetermined voltage by charging the battery the other battery module has, the other with turn off the switch with the battery module, the turns on the switch with the battery modules returned to normal, then cell module back to normal the by charging the battery with said battery modules returned to normal after the voltage of the battery having becomes the predetermined voltage, switches the other battery module has Battery pack, characterized in that to connect the turned on so the battery modules returned to the normally and the other battery modules.
  4. A battery pack according to claim 3,
    Wherein, when charging the battery the other battery module has, a constant current charging control, when charging the battery with said battery modules returned to normal, a constant current charge control, the normally after re-connecting the battery modules returned to the other battery modules, when charging the battery with the battery and the other battery module the battery module returns to normal has, characterized in that the constant voltage charging control the battery pack to be.
  5. A battery pack according to claim 3,
    Wherein, when charging the battery the other battery module has, a constant current constant voltage charging control, when charging the battery with the battery modules returned to the normal, the constant current and constant voltage charging control battery pack, characterized in that.
  6. A battery pack according to claim 1 or claim 3,
    Wherein the control unit returns to normal battery module becomes the abnormality, when reconnecting the battery module has returned to its normal to the other battery modules, and a battery having the battery module returns to the normal when the voltage lower than the voltage of the battery included in the other battery modules, and, when the voltage of the battery the battery module has returned to normal has it is equal to or less than the threshold, turns off the switch that the other battery module has together with the turns on the switch with the battery modules returned to normal, the by charging the battery with the battery modules returned to normal, the voltage of the battery included in the battery module returns to the normal, the other battery When the module becomes the same or substantially the same as the voltage of the battery with the switch to the other battery modules have Battery pack, characterized in that to connect the turned on so the battery modules returned to the normally and the other battery modules.
PCT/JP2017/012332 2016-04-21 2017-03-27 Battery pack WO2017183395A1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09215214A (en) * 1996-01-31 1997-08-15 Toshiba Corp Portable electronic apparatus and charging control method
JP2009033936A (en) * 2007-07-30 2009-02-12 Toshiba Corp Parallel-connected energy storage system
WO2010103816A1 (en) * 2009-03-13 2010-09-16 パナソニック株式会社 Charging/discharging control circuit, power source device and method for controlling a power source device
JP2016073021A (en) * 2014-09-26 2016-05-09 株式会社日立情報通信エンジニアリング Power storage system and precharge method for power storage system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09215214A (en) * 1996-01-31 1997-08-15 Toshiba Corp Portable electronic apparatus and charging control method
JP2009033936A (en) * 2007-07-30 2009-02-12 Toshiba Corp Parallel-connected energy storage system
WO2010103816A1 (en) * 2009-03-13 2010-09-16 パナソニック株式会社 Charging/discharging control circuit, power source device and method for controlling a power source device
JP2016073021A (en) * 2014-09-26 2016-05-09 株式会社日立情報通信エンジニアリング Power storage system and precharge method for power storage system

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