JP2012207989A - Dischargeable capacity correction system and power supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dischargeable capacity correction system capable of adequately correcting the dischargeable capacity of a battery pack being stored in a storage section in the battery pack.SOLUTION: The dischargeable capacity correction system comprises a battery pack 1 and a battery pack management device 2. The battery pack 1 has a storage section 14 for storing the dischargeable capacity of the battery pack 1. The battery pack 1 or the battery pack management device 2 is provided with: an information storage section for preliminarily storing information required for calculating the dischargeable capacity of the battery pack 1; a calculation section for calculating the dischargeable capacity of the battery pack 1 by using the information required for calculating the dischargeable capacity of the battery pack 1 preliminarily being stored by the information storage section; a determination section for determining whether a predetermined condition is being satisfied or not; and a substituting control section for making the storage section to substitute the dischargeable capacity of the battery pack 1 calculated by the calculation section when determined by the determination section that the predetermined condition is being satisfied.

Description

  The present invention relates to a technique for correcting a dischargeable capacity of a battery pack stored in a storage unit in the battery pack.

  At least one storage battery cell, a dischargeable capacity calculation unit for calculating a dischargeable capacity of the at least one storage battery cell (dischargeable capacity of the battery pack), and a dischargeable capacity calculated by the dischargeable capacity calculation unit are stored. A battery pack provided with a storage unit is widely used. In general, the dischargeable capacity detection unit includes a current sensor, and the battery pack discharges based on a discharge current (discharge current of the battery pack) of the at least one storage battery cell detected by the current sensor. Calculate the possible capacity.

Japanese Unexamined Patent Publication No. 2003-224901 (paragraphs 0005 to 0007)

  When transporting the above battery pack overseas by sea or when not using the above battery pack for a long time, the battery is powered by the standby power of the microcomputer that constitutes the spontaneous discharge of the storage battery cell and the dischargeable capacity calculation unit, etc. The dischargeable capacity of the pack may decrease gradually.

  However, when the dischargeable capacity of the battery pack gradually decreases due to the spontaneous discharge of the storage battery cells or the standby power of the microcomputer constituting the dischargeable capacity calculation unit, etc., the discharge current of the battery pack is very small. Since it cannot be detected by a relatively low-sensitivity current sensor provided in the pack, a large error is included in the dischargeable capacity of the battery pack stored in the storage unit of the battery pack.

  The technique disclosed in Patent Document 1 is a technique for obtaining the total capacity (full charge capacity) of a battery that has been repeatedly charged and discharged, and the dischargeable capacity of the battery pack stored in the storage unit of the battery pack. It is not a technology that eliminates large errors that can be included in

  In view of the above situation, the present invention provides a dischargeable capacity correction system capable of appropriately correcting the dischargeable capacity of a battery pack stored in a storage unit in the battery pack, and a power supply system including the dischargeable capacity correction system. The purpose is to do.

  In order to achieve the above object, a dischargeable capacity correction system according to the present invention is a dischargeable capacity correction system comprising a battery pack and a battery pack management device that manages the battery pack, wherein the battery pack includes the battery pack An information storage having a storage unit for storing the dischargeable capacity of the battery pack, and storing in advance information necessary for calculating either the battery pack or the battery pack management device to calculate the dischargeable capacity of the battery pack The battery pack using information necessary to calculate the dischargeable capacity of the battery pack stored in advance by the information storage unit by either the battery pack or the battery pack management device. Whether or not any of the battery pack and the battery pack management device satisfies a predetermined condition. A determination unit that determines whether the battery pack or the battery pack management device is determined by the determination unit to determine that the predetermined condition is satisfied. A configuration (first configuration) is provided that includes an overwrite control unit that overwrites the dischargeable capacity of the battery pack in the storage unit.

  Further, in the dischargeable capacity correction system of the first configuration, the predetermined condition includes a comparison result between a current date and time and a last use date and time of the battery pack, and the battery pack stored in the storage unit. It is good also as a structure (2nd structure) including the conditions regarding at least one of the comparison result of the dischargeable capacity | capacitance and the dischargeable capacity | capacitance of the said battery pack calculated by the said calculation part. Regarding the last use date and time of the battery pack, for example, the current sensor for detecting the charge and discharge completion date of the battery pack or the battery state provided in the battery pack detects the current for a certain period or more. After that, the date and time when the current is no longer detected or the capacity learning completion date and time of the battery pack may be set as the last use date and time of the battery pack.

  In addition, from the viewpoint of suppressing unnecessary correction of the dischargeable capacity, in the dischargeable capacity correction system of the second configuration, the determination unit has a difference of a predetermined period or more between the current date and time and the last use date and time of the battery pack. And / or a difference between the dischargeable capacity of the battery pack stored in the storage unit and the dischargeable capacity of the battery pack calculated by the calculation unit is greater than or equal to a threshold value. It is good also as a structure (3rd structure) which determines with satisfy | filling the said predetermined conditions when is satisfy | filled.

  Further, in the dischargeable capacity correction system having any one of the first to third configurations, the information necessary for calculating the dischargeable capacity of the battery pack includes the open voltage of the battery pack and the state of charge of the battery pack. It is good also as a structure (4th structure) which is the information regarding the relationship between.

  In addition, from the viewpoint of cost reduction and power consumption reduction of the battery pack, in the dischargeable capacity correction system having any one of the first to fourth configurations, the battery pack management device includes the information storage unit and the calculation unit. In addition, a configuration (fifth configuration) including the determination unit and the overwrite control unit may be employed.

  In order to achieve the above object, a power supply system according to the present invention includes a power converter, a power converter control unit that controls the power converter, a storage battery, and an electrical connection between the power converter and the storage battery. A power supply system including a plurality of lines each having a switch for turning on / off the switch and a switch control unit for controlling the switch, wherein the lines are connected to each other, wherein the storage battery includes a battery pack, and the switch The control unit includes a battery pack management device, and the battery pack and the battery pack management device are a battery pack and a battery pack management device provided in the power supply system having any one of the first to fifth configurations. .

  ADVANTAGE OF THE INVENTION According to this invention, the dischargeable capacity | capacitance of the battery pack memorize | stored in the memory | storage part in a battery pack can be corrected appropriately. Therefore, even when the battery pack is transported overseas by sea or when the battery pack is not used for a long time, a large error is not included in the dischargeable capacity of the battery pack stored in the storage unit of the battery pack.

It is a figure showing the schematic structure of the dischargeable capacity correction system concerning one embodiment of the present invention. It is a flowchart which shows the operation | movement regarding writing of the last use date of the battery pack to the memory | storage part in a battery pack. It is a flowchart which shows the operation | movement regarding overwrite of the dischargeable capacity | capacitance of the battery pack to the memory | storage part in a battery pack based on the write command of a battery pack management apparatus. It is a flowchart which shows the other operation | movement regarding overwrite of the dischargeable capacity | capacitance of the battery pack to the memory | storage part in a battery pack based on the write command of a battery pack management apparatus. It is a figure showing a schematic structure of an electric power supply system concerning one embodiment of the present invention.

  Embodiments of the present invention will be described below with reference to the drawings.

<< Dischargeable capacity correction system >>
FIG. 1 shows a schematic configuration of a dischargeable capacity correction system according to an embodiment of the present invention. A dischargeable capacity correction system according to an embodiment of the present invention shown in FIG. 1 includes a battery pack 1 and a battery pack management device 2 that manages the battery pack 1.

  The battery pack 1 includes a plurality of storage battery cells 11, a battery state detection unit 12, a control unit 13, a storage unit 14, and a communication unit 15. The storage unit 14 corresponds to an example of a “storage unit” recited in the claims.

  In the present embodiment, the plurality of storage battery cells 11 are connected in parallel and in series as shown in FIG. 1, but a connection configuration only in parallel connection or a connection configuration only in series connection may be used. In addition, a single storage battery cell 11 may be provided in the battery pack 1 without providing a plurality of storage battery cells 11.

  The battery state detection unit 12 detects the current of the battery pack 1, the open voltage of the battery pack 1, the full charge capacity of the battery pack 1, and the dischargeable capacity of the battery pack 1. The battery state detection unit 12 detects the full charge capacity of the battery pack 1 by performing capacity learning at regular intervals, or if there is an opportunity to perform capacity learning at that time. Yes. In addition, the battery state detection unit 12 detects the dischargeable capacity of the battery pack 1 by calculating the dischargeable capacity of the battery pack 1 based on the current (discharge current) of the battery pack 1.

  The control unit 13 causes the storage unit 14 to store the full charge capacity of the battery pack 1 and the dischargeable capacity of the battery pack 1 detected by the battery state detection unit 12. Further, the control unit 13 detects the current of the battery pack 1 and the open voltage of the battery pack 1 detected by the battery state detection unit 12 and the battery state detection unit 12 and stores them in the storage unit 14 as necessary. The full charge capacity of the battery pack 1 and a part or all of the dischargeable capacity of the battery pack 1 are transmitted to the battery pack management apparatus 2 via the communication unit 15. Furthermore, when receiving a write command from the battery pack management device 2 via the communication unit 15, the control unit 13 writes to the storage unit 14 according to the write command.

  The battery pack management device 2 includes a storage unit 21, a control unit 22, and a communication unit 23. The storage unit 21 corresponds to an example of “information storage unit” recited in the claims, and the control unit 22 corresponds to an example of “calculation unit”, “determination unit”, and “overwrite control unit” recited in the claims To do.

  The storage unit 21 stores in advance information necessary for calculating the dischargeable capacity of the battery pack 1.

  When the control unit 22 determines that the predetermined condition is satisfied, the battery pack calculated using information necessary for calculating the dischargeable capacity of the battery pack 1 stored in advance by the storage unit 21 A write command for instructing the storage unit 14 to overwrite the dischargeable capacity of 1 is transmitted to the battery pack 1 via the communication unit 23. The predetermined condition depends on the comparison result between the current date and time and the last use date and time of the battery pack 1, the dischargeable capacity of the battery pack 1 stored in the storage unit 14 in the battery pack 1, and the storage unit 21. It is desirable to include a condition regarding at least one of the comparison results with the dischargeable capacity of the battery pack 1 calculated using information necessary for calculating the dischargeable capacity of the battery pack 1 stored in advance. Regarding the last use date and time of the battery pack 1, for example, after the charge and discharge completion date and time of the battery pack 1 or the current sensor provided in the battery state detection unit 12 in the battery pack 1 detects the current for a certain period or longer, The date and time when no current is detected or the capacity learning completion date and time of the battery pack 1 may be set as the last use date and time of the battery pack 1. Further, when the predetermined condition includes a condition related to a comparison result between the current date and time and the last use date and time of the battery pack 1, for example, the control unit 22 has a function (so-called calendar function) that can grasp the current date and time. Furthermore, the control unit 22 transmits a write command instructing to write the last use date and time of the battery pack 1 to the storage unit 14 to the battery pack 1 via the communication unit 23, and the control unit 13 The last use date and time of the battery pack 1 may be written in the storage unit 14 in accordance with the instruction.

  The above-described dischargeable capacity correction system according to the embodiment of the present invention shown in FIG. 1 indicates the dischargeable capacity of the battery pack 1 stored in the storage unit 14 in the battery pack 1 when a predetermined condition is satisfied. Since the correction is made, even when the battery pack is transported overseas by sea or when the battery pack is not used for a long time, the dischargeable capacity stored in the storage unit 14 of the battery pack 1 does not include a large error. It becomes possible to do.

<First operation example>
A first operation example of the dischargeable capacity correction system according to the embodiment of the present invention shown in FIG. 1 will be described with reference to the flowcharts shown in FIGS. FIG. 2 is a flowchart showing an operation related to writing of the last use date and time of the battery pack 1 to the storage unit 14 in the battery pack 1. FIG. 3 is a flowchart showing an operation related to overwriting of the dischargeable capacity of the battery pack 1 to the storage unit 14 in the battery pack 1 based on the write command of the battery pack management device 2.

  As shown in FIG. 2, the control unit 22 of the battery pack management device 2 is provided in the battery state detection unit 12 in the battery pack 1, (1) whether or not charging / discharging of the battery pack 1 is completed. It is determined whether or not the current sensor has detected the current for a certain period or more and (3) whether or not the capacity learning has been completed (step S10). The battery pack management device 2 has a function of controlling a switch for turning on / off the electrical connection between the load and the battery pack 1, and the battery pack management device 2 performs charge / discharge control of the battery pack 1 and capacity learning of the battery pack 1. When the control is performed, the determinations (1) and (3) can be executed without communicating with the battery pack 1. On the other hand, communication with the battery pack 1 is indispensable for executing the determination of (2).

  When the results of the determinations (1) to (3) are all negative (NO in step S10), the process returns to step S10, and the determinations (1) to (3) are performed again.

  On the other hand, when the determination results of (1) to (3) are not at least one (YES in step S10), the control unit 22 of the battery pack management device 2 performs the charge / discharge completion date and time of the battery pack 1, or After the current sensor provided in the battery state detection unit 12 in the battery pack 1 detects the current for a certain period or longer, the date and time when the current is no longer detected or the capacity learning completion date and time of the battery pack 1 is displayed. A write command for instructing the storage unit 14 to write the last use date and time of the battery pack 1 is transmitted to the battery pack 1 via the communication unit 23 (step S20). The control unit 13 of the battery pack 1 writes the last use date and time of the battery pack 1 in the storage unit 14 in accordance with the write command (step S20). Note that the Nth writing (N is a natural number of 2 or more) times overwrites the last use date and time of the battery pack 1. After completion of step S20, the process returns to step S10, and the determinations (1) to (3) are performed again.

  In this operation example, in the determination of (2) above, it is added to the determination condition that the current sensor detects a current for a certain period or longer. This can prevent the control unit 13 from erroneously determining that the battery pack 1 has been used when an instantaneous current flows due to noise.

  The control unit 22 of the battery pack management device 2 performs the operation flow shown in FIG. 3 in addition to the operation flow shown in FIG.

  As shown in FIG. 3, the control unit 22 of the battery pack management device 2 [1] determines whether or not the battery pack management device 2 is activated. [2] A certain period has elapsed since the previous determination in step S110. It is determined whether or not (step S110).

  When the determination results of [1] and [2] are all negative (NO in step S110), the process returns to step S110, and the determinations of [1] and [2] again (the determination of [1] is omitted). May do).

  On the other hand, if the result of any of the determinations [1] and [2] is not negative (YES in step S110), it is determined whether or not the battery pack 1 is in a steady state in which the current does not flow for a certain period. (Step S120).

  If the battery pack 1 is not in a steady state (NO in step S120), the open voltage of the battery pack 1 is not stable. Therefore, step S110 is performed without correcting the dischargeable capacity of the battery pack 1 stored in the storage unit 14 in the battery pack 1. Then, the determinations of [1] and [2] are performed again (the determination of [1] may be omitted).

  On the other hand, if it is a steady state (YES in step S120), the control unit 22 of the battery pack management device 2 sets the last use date and time of the battery pack 1 stored in the storage unit 14 in the battery pack 1 as the battery pack 1. It is determined whether there is a difference of a predetermined period or more between the current date and time and the last used date and time of the obtained battery pack 1 (step S130).

  If there is no difference between the current date and time and the obtained last use date and time of the battery pack 1 for a predetermined period or longer (NO in step S130), the dischargeable capacity of the battery pack 1 stored in the storage unit 14 in the battery pack 1 Therefore, the process returns to step S110 without correcting the dischargeable capacity of the battery pack 1 stored in the storage unit 14 in the battery pack 1, and the above [1] and The determination of [2] is performed (the determination of [1] above may be omitted).

  On the other hand, if there is a difference of a predetermined period or more between the current date and time and the last use date and time of the acquired battery pack 1 (YES in step S130), the control unit 22 of the battery pack management device 2 determines the open voltage of the battery pack 1. And the full charge capacity of the battery pack 1 is acquired by communication with the battery pack 1, and the open-circuit voltage of the battery pack 1 and the state of charge (SOC) of the battery pack 1 stored in advance by the storage unit 21 are obtained. Using the information related to the relationship, the SOC of the battery pack 1 is obtained from the obtained open-circuit voltage of the battery pack 1, and the SOC of the obtained battery pack 1 is multiplied by the full charge capacity of the obtained battery pack 1 to obtain the battery pack. The dischargeable capacity of 1 is calculated (step S140). The control unit 22 of the battery pack management device 2 has a difference equal to or greater than a threshold value between the calculated dischargeable capacity of the battery pack 1 and the dischargeable capacity of the battery pack 1 stored in the storage unit 14 in the battery pack 1. It is determined whether or not there is (step S140). In this operation example, the “relationship between the open-circuit voltage of the battery pack 1 stored in advance in the storage unit 21 and the SOC of the battery pack 1” is the same as that of the battery pack 1 stored in advance in the storage unit 21. This corresponds to “information necessary for calculating the dischargeable capacity”. The relationship between the open circuit voltage of the battery pack 1 and the SOC of the battery pack 1 may be stored in advance in the storage unit 21 in the form of a characteristic equation, or may be stored in advance in the storage unit 21 in the form of a data table. , A combination of the characteristic formula and the data table (for example, in the range where the correlation between the open voltage of the battery pack 1 and the SOC of the battery pack 1 is high (SOC is 20% to 80%), the characteristic formula is used. Then, the data may be stored in the storage unit 21 in advance using a data table.

  If the calculated dischargeable capacity of the battery pack 1 and the dischargeable capacity of the battery pack 1 stored in the storage unit 14 in the battery pack 1 are not different from each other by a threshold (NO in step S140), the battery pack Since the dischargeable capacity of the battery pack 1 stored in the storage unit 14 in 1 does not include a large error, the dischargeable capacity of the battery pack 1 stored in the storage unit 14 in the battery pack 1 is corrected. Without returning to step S110, the determination of [1] and [2] is performed again (the determination of [1] may be omitted).

  On the other hand, if the calculated dischargeable capacity of the battery pack 1 and the dischargeable capacity of the battery pack 1 stored in the storage unit 14 in the battery pack 1 are different from each other by a threshold (YES in step S140). Then, a write command for instructing the storage unit 14 to overwrite the calculated dischargeable capacity of the battery pack 1 is transmitted to the battery pack 1 via the communication unit 23 (step S150). The control unit 13 of the battery pack 1 overwrites the storage unit 14 with the dischargeable capacity of the battery pack 1 in accordance with the write command (step S150). After completion of step S150, the process returns to step S110, and the determinations of [1] and [2] are performed again (determination of [1] may be omitted).

  During the period from the execution of the current step S150 to the execution of the next step S150, the dischargeable capacity of the battery pack 1 detected by the battery state detection unit 12 is overwritten in the storage unit 14.

  An embodiment in which the storage unit 14 in the battery pack 1 stores the SOC of the battery pack 1 in addition to the full charge capacity of the battery pack 1 and the dischargeable capacity of the battery pack 1 is also conceivable. In the case of the embodiment, in step S150, not only the calculated dischargeable capacity of the battery pack 1 but also the obtained SOC of the battery pack 1 may be overwritten in the storage unit 14.

  Moreover, it is possible to abolish at least one of step S130 and step S140. When step S140 is abolished, in step S150, the control unit 22 of the battery pack management device 2 acquires the open-circuit voltage of the battery pack 1 and the full charge capacity of the battery pack 1 through communication with the battery pack 1. The SOC of the battery pack 1 is obtained from the obtained open-circuit voltage of the battery pack 1 using the information on the relationship between the open-circuit voltage of the battery pack 1 and the SOC of the battery pack 1 that is stored in advance by the storage unit 21. What is necessary is just to calculate the dischargeable capacity of the battery pack 1 by multiplying the obtained SOC of the battery pack 1 by the obtained full charge capacity of the battery pack 1.

  Further, it is determined based on the value of the open voltage of the battery pack 1 whether or not the correlation between the open voltage of the battery pack 1 and the SOC of the battery pack 1 is high (for example, SOC is 20% to 80%), Only when it is determined that the correlation between the open-circuit voltage of the battery pack 1 and the SOC of the battery pack 1 is in a high range, a step of shifting to step S150 may be provided before step S150.

  Further, since the SOC of the battery pack 1 is temperature-dependent, information regarding the relationship between the open-circuit voltage of the battery pack 1 and the SOC of the battery pack 1 that is stored in advance by the storage unit 21 is information that considers the temperature (for example, , Information in which a characteristic equation or a data table is set for each predetermined temperature).

  In addition, the battery pack 1 has a discharge capacity that is stored in the storage unit 14 in the battery pack 1 so that a large error is not included (for example, storage in the battery pack 1 before the continuous use of the battery pack 1 is started). The battery pack stored in the storage unit 14 in the battery pack 1 when the continuous use of the battery pack 1 is completed when the dischargeable capacity of the battery pack 1 stored in the unit 14 is corrected) 1 and the dischargeable capacity of the battery pack 1 calculated using information on the relationship between the open-circuit voltage of the battery pack 1 and the SOC of the battery pack 1 stored in advance by the storage unit 21. Based on this, the control unit 22 of the battery pack management device 2 estimates the full charge capacity of the battery pack 1 and overwrites the estimated full charge capacity of the battery pack 1 on the storage unit 14 in the battery pack 1. Unishi may be. Thereby, it is possible to reduce the frequency of capacity learning or abolish capacity learning. Therefore, it is particularly useful when it is difficult or impossible to fully charge the battery pack 1 or reduce the SOC due to restrictions on the usage pattern of the battery pack 1.

  Further, the battery pack management device 2 calculates the dischargeable capacity of the battery pack 1 using information related to the function related to the present invention (for example, the calendar function and information on the relationship between the open voltage of the battery pack 1 and the SOC of the battery pack 1). The battery pack 1 may be responsible for some of the functions.

<Second operation example>
A second operation example of the dischargeable capacity correction system according to the embodiment of the present invention shown in FIG. 1 will be described with reference to the flowchart shown in FIG. FIG. 4 is a flowchart showing another operation related to overwriting of the dischargeable capacity of the battery pack 1 to the storage unit 14 in the battery pack 1 based on the write command of the battery pack management device 2.

  Since the operation related to the writing of the last use date and time of the battery pack 1 to the storage unit 14 in the battery pack 1 is the same as in the case of the first operation example described above (see FIG. 2), the description thereof is omitted.

  In this operation example, the control unit 22 of the battery pack management device 2 performs the operation flow shown in FIG. 4 together with the operation flow shown in FIG.

  The processing in steps S110 to S130 in the operation flow shown in FIG. 4 is the same as in the case of the first operation example described above (see FIG. 2), and thus the description thereof is omitted.

  If there is a difference of not less than a predetermined period between the current date and time and the last use date and time of the acquired battery pack 1 (YES in step S130), the control unit 22 of the battery pack management device 2 will have the current date and time in the battery pack 1 The power consumption per unit time (the power consumption of the battery pack 1 when the battery pack 1 is not used) is calculated for the elapsed time that is the difference between the last use date and time of the battery pack 1 stored in the storage unit 14. It is determined whether or not the dischargeable capacity reduction obtained by multiplication is equal to or greater than a threshold value (step S160). The “power consumption per unit time” is obtained from measurements, catalog values, and the like, and is stored in advance in the storage unit 21 of the battery pack management device 2. In this operation example, the “power consumption per unit time” is stored in advance in the storage unit 21. This corresponds to “information necessary for calculating the dischargeable capacity of the battery pack 1”.

  If the calculated dischargeable capacity decrease is not equal to or greater than the threshold (NO in step S160), the dischargeable capacity of the battery pack 1 stored in the storage unit 14 in the battery pack 1 does not include a large error. Then, the process returns to step S110 without correcting the dischargeable capacity of the battery pack 1 stored in the storage unit 14 in the battery pack 1, and the determinations of [1] and [2] are again made (the determination of [1] is (May be omitted).

  On the other hand, if the calculated decrease in the dischargeable capacity is equal to or greater than the threshold value (YES in step S170), the control unit 22 of the battery pack management device 2 stores the battery pack 1 stored in the storage unit 14 in the battery pack 1. The battery pack 1 is instructed via the communication unit 23 to write a command for subtracting the calculated decrease in the dischargeable capacity from the dischargeable capacity of the battery pack and overwriting the result into the storage unit 14 as the dischargeable capacity of the battery pack 1. (Step S170). The control unit 13 of the battery pack 1 overwrites the storage unit 14 with the dischargeable capacity of the battery pack 1 in accordance with the write command (step S170). After completion of step S170, the process returns to step S110, and the above determinations [1] and [2] are made again (the determination of [1] may be omitted).

  During the period from the execution of step S170 this time to the execution of next step S170, the dischargeable capacity of the battery pack 1 detected by the battery state detection unit 12 is overwritten in the storage unit 14.

  An embodiment in which the storage unit 14 in the battery pack 1 stores the SOC of the battery pack 1 in addition to the full charge capacity of the battery pack 1 and the dischargeable capacity of the battery pack 1 is also conceivable. In the case of this embodiment, in step S170, not only the dischargeable capacity of the battery pack 1 obtained from the subtraction result, but also the full charge capacity of the battery pack 1 and the dischargeable capacity of the battery pack 1 obtained from the subtraction result. The SOC of the battery pack 1 that can be obtained from the above is also to be overwritten in the storage unit 14.

  Moreover, it is possible to abolish at least one of step S130 and step S160. When step S160 is abolished, in step S170, the control unit 22 of the battery pack management device 2 determines the current date and time and the last use date and time of the battery pack 1 stored in the storage unit 14 in the battery pack 1. The elapsed time, which is the difference between the two, may be multiplied by the power consumption per unit time (the power consumption of the battery pack 1 when the battery pack 1 is not used) to obtain the decrease in dischargeable capacity.

  In addition, the battery pack 1 has a discharge capacity that is stored in the storage unit 14 in the battery pack 1 so that a large error is not included (for example, storage in the battery pack 1 before the continuous use of the battery pack 1 is started). The battery pack stored in the storage unit 14 in the battery pack 1 when the continuous use of the battery pack 1 is completed when the dischargeable capacity of the battery pack 1 stored in the unit 14 is corrected) The control unit of the battery pack management device 2 based on the difference between the dischargeable capacity of 1 and the dischargeable capacity of the battery pack 1 calculated using the power consumption per unit time stored in advance by the storage unit 21 22 may estimate the full charge capacity of the battery pack 1 and overwrite the estimated full charge capacity of the battery pack 1 on the storage unit 14 in the battery pack 1. Thereby, it is possible to reduce the frequency of capacity learning or abolish capacity learning. Therefore, it is particularly useful when it is difficult or impossible to fully charge the battery pack 1 or reduce the SOC due to restrictions on the usage pattern of the battery pack 1.

  In addition, the battery pack 1 has some of the functions of the battery pack management device 2 related to the present invention (for example, a calendar function or a function of calculating the dischargeable capacity of the battery pack 1 using power consumption per unit time). You may make it bear.

<< Power supply system >>
FIG. 5 shows a configuration of a power supply system according to an embodiment of the present invention. A power supply system according to an embodiment of the present invention shown in FIG. 5 includes a master controller 31, a PCS (Power Conditioning System) 32, a PCS management controller 33, a BSU (Battery Switching Unit) 34, and a BMU (Battery). Management Unit) 35, a master BMU 36, and a storage battery 37. In the power supply system according to the embodiment of the present invention shown in FIG. 5, a plurality of series composed of the PCS 32, the PCS management control unit 33, the BSU 34, the BMU 35, and the storage battery 37 are provided. Each series is connected to the master controller 31 so as to be connected in parallel.

<Outline of master controller>
The master controller 31 is connected to the external load 100 and the power system 200. The load 100 is a load having an AC power input terminal, and the power system 200 is a power system that supplies AC power. The master controller 31 monitors and controls the PCS management control unit 33 of each series in an integrated manner. That is, the master controller 31 determines the charge / discharge amount for each series at normal times, and transmits a charge / discharge control command corresponding to the determination to the PCS management control unit 33 of each series. A PCS 32 stop command, a PCS 32 standby command, or a breaker (not shown) blocking command installed on the PCS 32 side is transmitted to the management control unit 33.

<Outline of PCS>
The PCS 32 is a bidirectional AC / DC power converter that converts AC power supplied from the power system 200 via the master controller 31 during charging into DC power, and from the storage batteries 37 belonging to the same series during discharging. The DC power supplied via the BSU 34 belonging to is converted to AC power. Unlike the present embodiment, when the master controller 31 is connected to an external DC load (a load having a DC power input terminal) and a DC power source (for example, a solar cell), the PCS 32 is connected to a bidirectional DC / DC power. What is necessary is just to change to a converter.

<Outline of PCS management control unit>
The PCS management control unit 33 controls the operation of the PCS 32 belonging to the same series based on the charge / discharge control command sent from the master controller 31, and monitors the state of the PCS 32 belonging to the same series. The PCS management control unit 33 also stops the PCS 32 belonging to the same series, waits for the PCS 32 belonging to the same series, or shuts off a breaker (not shown) installed on the PCS 32 side belonging to the same series at the time of abnormality.

<Outline of BSU>
The BSU 34 is a switch for turning on / off the electrical connection between the PSC 32 belonging to the same series and the storage battery 37 belonging to the same series, and is controlled by the BMU 35 belonging to the same series.

<Outline of BMU>
The BMU 35 controls the BSUs 34 belonging to the same series and monitors the state of the BSUs 34 belonging to the same series and the state of the storage batteries 37 belonging to the same series.

  Further, the BMU 35 transmits a command to turn off the BSU 34 to the BSUs 34 belonging to the same series when an abnormality occurs.

  Further, the BMU 35 includes a battery pack management device 2 (not shown in FIG. 5).

<Outline of Master BMU>
The master BMU 36 monitors and controls the storage battery 37, the BSU 34, and the BMU 35 of each series in an integrated manner. That is, the master BMU 36 collects and stores log information regarding the state of the storage battery 37, the state of the BSU 34, the state of the BMU 35, and the like sent from the BMU 35 of each series, and toward the arbitrary BMU 35 as necessary. Then, a command to turn off the BSU 34 belonging to the same series as that arbitrary BMU 35 is transmitted.

<Outline of storage battery>
The storage battery 37 may be a single battery pack 1 (not shown in FIG. 5), or may be a plurality of battery packs 1 (not shown in FIG. 5) connected together. In order to increase the voltage of the storage battery 37, a plurality of battery packs 1 (not shown in FIG. 5) may be connected in series. When the storage battery 37 includes a plurality of battery packs 1, the battery pack management device 2 (not shown in FIG. 5) included in the BMU 35 may be set to a specification that can manage the plurality of battery packs 1. .

DESCRIPTION OF SYMBOLS 1 Battery pack 2 Battery pack management apparatus 11 Storage battery cell 12 Battery state detection part 13, 22 Control part 14, 21 Storage part 15, 23 Communication part 31 Master controller 32 PCS
33 PCS management control unit 34 BSU
35 BMU
36 Master BMU
37 Storage battery 100 Load 200 Power system

Claims (6)

A battery pack;
Dischargeable capacity correction system comprising a battery pack management device for managing the battery pack,
The battery pack has a storage unit that stores a dischargeable capacity of the battery pack,
Either the battery pack or the battery pack management device has an information storage unit that stores in advance information necessary for calculating the dischargeable capacity of the battery pack,
Either the battery pack or the battery pack management device calculates the dischargeable capacity of the battery pack using information necessary for calculating the dischargeable capacity of the battery pack stored in advance by the information storage unit. A calculation unit for calculating,
Either of the battery pack and the battery pack management device has a determination unit that determines whether or not a predetermined condition is satisfied,
When either of the battery pack and the battery pack management device determines that the predetermined condition is satisfied by the determination unit, the dischargeable capacity of the battery pack calculated by the calculation unit is A dischargeable capacity correction system comprising an overwriting control unit for overwriting a storage unit.   The predetermined condition includes a comparison result between the current date and time and the last use date and time of the battery pack, the dischargeable capacity of the battery pack stored in the storage unit, and the battery pack calculated by the calculation unit. The dischargeable capacity correction system according to claim 1, comprising a condition relating to at least one of the comparison results with the dischargeable capacity.     The determination unit is calculated by the calculation unit that there is a difference of a predetermined period or more between the current date and time and the last use date and time of the battery pack, and the dischargeable capacity of the battery pack stored in the storage unit The dischargeable capacity correction according to claim 2, wherein it is determined that the predetermined condition is satisfied when both or any one of the difference between the dischargeable capacity of the battery pack and the dischargeable capacity is satisfied. system.   The information necessary for calculating the dischargeable capacity of the battery pack is information relating to a relationship between an open-circuit voltage of the battery pack and a state of charge of the battery pack. Dischargeable capacity correction system.   The dischargeable capacity correction system according to any one of claims 1 to 4, wherein the battery pack management device includes the information storage unit, the calculation unit, the determination unit, and the overwrite control unit. A power converter, a power converter control unit that controls the power converter, a storage battery, a switch that turns on / off electrical connection between the power converter and the storage battery, and a switch control unit that controls the switch A power supply system including a plurality of systems having
The storage battery has a battery pack, the switch control unit has a battery pack management device,
The said battery pack and the said battery pack management apparatus are a battery pack and a battery pack management apparatus with which the power supply system of any one of Claims 1-5 is provided, The power supply system characterized by the above-mentioned.

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