JPWO2016147614A1 - Storage battery device and capacity correction method - Google Patents

Abstract

Capacitance correction processing can be performed even during charging and discharging. For this reason, a connection switch that is provided for each battery pack and controls connection between the battery pack and the load, a measuring unit that measures at least the open terminal voltage of the battery pack, and a voltage that stores the open terminal voltage in advance A capacity management unit including a capacity management unit that applies to the capacity conversion information, calculates a measured capacity of the battery pack, and corrects and updates the stored management capacity based on the measured capacity, and receiving from the outside A control unit that outputs a control signal including a charge / discharge command and a capacity correction command for charging / discharging the battery pack in response to a power request, and a relay drive unit that turns on and off the connection switch based on the control signal, When the controller performs capacity correction on one of the plurality of battery packs, the controller outputs a capacity correction command for causing one of the plurality of capacity management units to perform capacity correction. When the amount correction command is received, the connection switch connected to the battery pack whose capacity is to be corrected is turned off, and the capacity management unit calculates the actual capacity by applying the open terminal voltage from the measurement unit to the voltage-capacitance conversion information. The management capacity is corrected and updated with the measured capacity.

Description

  The present invention relates to a storage battery device and a capacity correction method.

  In the battery pack, the storage capacity managed based on the charge / discharge amount may be different from the actual storage capacity. In a storage battery device equipped with such a battery pack, it is necessary to charge and discharge according to the actual storage capacity. In particular, when the battery pack is always charged / discharged at an intermediate capacity (meaning the storage capacity between the fully charged state and the no capacity state), there is a difference between the managed storage capacity and the actual storage capacity. It becomes a problem.

  In view of this, Japanese Patent Application Laid-Open No. 2014-132243 discloses a technique for measuring an open circuit voltage from the time when charging / discharging of a battery pack is stopped and estimating an actual storage capacity based on the open circuit voltage. As other prior art documents, Japanese Patent Application Laid-Open No. 2007-250521 and Japanese Patent No. 5615995 are known.

JP 2014-132243 A JP 2007-250521 A Japanese Patent No. 5615995

  However, the configuration according to Japanese Patent Application Laid-Open No. 2014-132243 has a problem that it cannot be performed during charging / discharging in order to correct the storage capacity managed by the actual storage capacity.

  Therefore, a main object of the present invention is to provide a storage battery device and a capacity correction method that can perform capacity correction processing even during charging and discharging.

  In order to solve the above problems, an invention relating to a storage battery device that charges and discharges a plurality of battery packs is provided for each battery pack, and a connection switch that controls connection between the battery pack and a load, and at least the opening of the battery pack Apply the measurement unit that measures the terminal voltage and the voltage capacity conversion information that stores the open terminal voltage in advance, calculate the measured capacity of the battery pack, and correct the already stored management capacity based on the measured capacity A capacity management unit including a capacity management unit to be updated, a control unit for outputting a control signal including a charge / discharge command and a capacity correction command for charging / discharging the battery pack in response to an external power supply / reception request, and a control signal A relay drive unit that turns the connection switch on and off based on the control unit, and the control unit performs a capacity correction on one of the plurality of battery packs when the plurality of capacity management units When the capacity correction command for performing capacity correction on one is output, and the relay drive unit receives the capacity correction command, the relay switch turns off the connection switch connected to the battery pack for capacity correction, An actual measurement capacity is calculated by applying the open terminal voltage from the measurement unit to the voltage capacity conversion information, and the management capacity is corrected and updated by the actual measurement capacity.

  Moreover, the invention concerning the capacity correction method in the storage battery device that charges and discharges a plurality of battery packs controls the connection between the battery pack and the load by controlling the connection switch included in the capacity management unit provided for each battery pack. The measurement unit measures at least the open terminal voltage of the battery pack, and the capacity management unit applies the open terminal voltage to the voltage capacity conversion information stored in advance to calculate the actual capacity of the battery pack. A procedure for correcting and updating the already-stored management capacity based on the above, and a procedure for outputting a control signal including a charge / discharge command and a capacity correction command for charging / discharging the battery pack in response to an external power supply / reception request by the control unit And a procedure for making the connection switch ON / OFF based on the control signal by the relay drive unit, when performing capacity correction for one of the plurality of battery packs. The control unit outputs a capacity correction command that causes one of the plurality of capacity management units to perform capacity correction, and when the relay driving unit receives the capacity correction command, the connection switch connected to the battery pack that performs capacity correction The capacity management unit applies the open terminal voltage from the measurement unit to the voltage-capacitance conversion information, calculates the actual capacity, and corrects and updates the management capacity with the actual capacity.

  According to the present invention, since the capacity correction process is an interrupt process, the capacity correction process can be performed even during charging and discharging.

It is a block diagram of the storage battery device concerning a 1st embodiment. It is the figure which showed the time change of the terminal voltage or open terminal voltage of one battery pack of two battery packs. It is the figure which showed the time change of the terminal voltage of the battery pack made into the other capacity | capacitance correction object of two battery packs, or an open terminal voltage. It is the figure which showed the time change of the charging / discharging electric current of one battery pack. It is the figure which showed the time change of the charging / discharging current of the battery pack made into the other capacity | capacitance correction | amendment object.

It is the figure which showed the operation state of one connection switch about time. It is the figure which showed the operation state of the connection switch by the side of the other capacity correction object about time.

It is the figure which showed the storage capacity of one battery pack about time. It is the figure which showed the storage capacity of the battery pack made into the other capacity | capacitance correction | amendment about time. It is a flowchart which shows the procedure of a charging / discharging process. It is a flowchart which shows the procedure of a capacity | capacitance correction process. It is a block diagram of the storage battery apparatus concerning 2nd Embodiment. It is a flowchart which shows an operation | movement procedure. It is the figure which showed the operation state of the connection switch. It is a figure which shows the operation state of the connection switch by the side of capacity correction object. It is a figure which shows the operation state of a restriction | limiting switch. It is a figure which shows the operation state of the limiting switch by the side of a contact | capacitance correction | amendment object. It is the figure which showed the charging current of the battery pack made into capacity correction object. It is a block diagram of the storage battery apparatus concerning 3rd Embodiment. It is a flowchart which shows an operation | movement procedure. It is the figure which showed the operation state of the connection switch. It is a figure which shows the operation state of the connection switch by the side of capacity correction object. It is a figure which shows the operation state of a restriction | limiting switch. It is a figure which shows the operation state of the limit switch by the side of capacity | capacitance correction. It is the figure which showed the charging current of the battery pack of capacity correction object.

<First Embodiment>
A first embodiment of the present invention will be described. FIG. 1 is a block diagram of a storage battery device 2A according to the present embodiment. The storage battery device 2A includes a battery pack 11 (11a, 11b), a measurement unit 12 (12a, 12b), a capacity management unit 13 (13a, 13b), a connection switch 14 (14a, 14b), a relay drive unit 15, and a voltage conversion. Unit 16 and control unit 17. Then, the storage battery device 2A supplies power from the battery pack 11 to the outside, and receives power from the outside to charge the battery pack 11.

  Here, “external” refers to a power plant or the like to which the storage battery device 2A receives and supplies power, but is not limited thereto. For example, other DC power sources (including storage batteries) may be used. When a DC power source is used as the outside, the voltage conversion unit 16 that performs AC / DC conversion is not necessary.

  Note that the measurement unit 12, the capacity management unit 13, and the connection switch 14 constitute a capacity management unit, and each unit is provided corresponding to the battery pack 11. That is, one capacity management unit is provided in one battery pack 11.

  Note that the voltage of the battery pack 11 may differ depending on whether the load (here, the voltage conversion unit 16) is connected or not. Therefore, the voltage when the load is connected is described as a connection terminal voltage, the voltage when the load is not connected is described as an open terminal voltage, and these are collectively referred to as a terminal voltage.

  The battery pack 11 is formed by modularizing a plurality of storage batteries. The plurality of battery packs 11 are connected in parallel, and this is connected in parallel with the voltage conversion unit 16.

  In FIG. 1, two battery packs 11 a and 11 b are illustrated, but the purpose is not to limit the number to two, and it is sufficient if there are two or more.

  The measurement part 12 (12a, 12b) measures the terminal voltage and charging / discharging current of the battery pack 11, and outputs a measurement result to the capacity management part 13 as measurement information.

  The capacity management unit 13 (13a, 13b) stores the management capacity of the subordinate battery pack 11, accumulates the charged / discharged current value based on the measurement information from the measurement unit 12, and stores the storage capacity of the battery pack 11. Update.

  Further, the capacity management unit 13 performs capacity correction processing according to an instruction from the control unit 17. In the capacity correction process, the open terminal voltage of the battery pack 11 is obtained from the measurement information, and the actual storage capacity is calculated as the actually measured capacity by applying the open terminal voltage to the voltage capacity conversion information stored in advance. Then, the management capacity is corrected based on the actually measured capacity, and the corrected management capacity is sent to the control unit 17. The voltage capacity conversion information is information in which the correspondence between the open terminal voltage and the actual storage capacity is summarized in the form of a table or the like.

  Here, the capacity obtained by integrating the charged / discharged current values based on the measurement information is the management capacity, the capacity calculated based on the open terminal voltage of the battery pack 11 is the actual capacity, and these management capacity and actual capacity are collectively referred to. Defined as storage capacity.

  The connection switch 14 (14a, 14b) has one end connected to the terminal of the battery pack 11 and the other end connected to the terminal of the voltage conversion unit 16, and is turned on and off based on the drive signal from the relay drive unit 15. Thus, the connection state between the battery pack 11 and the voltage conversion unit 16 is controlled. As such a connection switch 14, a semiconductor switch such as a transistor or a relay can be used.

  The relay drive unit 15 receives a control signal including a charge / discharge command and a capacity correction command from the control unit 17, and controls and drives the ON / OFF operation of the connection switch 14 based on the control signal, and from the capacity management unit 13. Is relayed and output to the control unit 17.

  When the DC power from the battery pack 11 is supplied to the outside (when the battery pack 11 is discharged), it is necessary to convert it to AC power and supply it. Moreover, when charging the battery pack 11, it is necessary to convert the supplied AC power into DC power. In either case, it is necessary to control the voltage value and the current value.

  Therefore, the voltage conversion unit 16 includes a power conditioner system having such a function.

  The control unit 17 outputs a control signal to the relay drive unit 15 and the voltage conversion unit 16 in response to an external power supply / reception request, and receives capacity information from the capacity management unit 13 via the relay drive unit 15. Store in a storage area (not shown).

  When such a control unit 17 receives the power supply / reception request, it plans the charge / discharge amount for each battery pack 11 based on the stored capacity information, and uses this as a control signal for the relay drive unit 15 and the voltage conversion unit 16. Output.

  In addition, when the storage battery system is provided above the storage battery device 2A, the control unit 17 may be a control unit of the storage battery system. At this time, the storage battery system may control a plurality of storage battery devices 2A.

  Next, the operation of the storage battery device 2A will be described with reference to FIGS. 2A, 2B, 3A, 3B, 4A, 4B, 5A, 5B, 6, and 7. FIG.

  The storage battery device 2A uses charge / discharge processing (charge processing and discharge processing) and capacity correction processing that is interrupt processing for the charge / discharge processing as a large processing procedure. However, the execution of the capacity correction process does not mean that the charge / discharge process is stopped, but is performed in parallel with the charge / discharge process.

  The charging process is a process for charging the battery pack 11, and the discharging process is a process for supplying power from the battery pack 11. On the other hand, the capacity correction process is a process for correcting and updating the management capacity of the battery pack 11 as described later.

  FIG. 2A is a diagram showing a time change of the terminal voltage or the open terminal voltage of the battery pack 11a, and FIG. 2B is a diagram showing the terminal voltage of the battery pack 11b.

  FIG. 3A is a diagram illustrating a change over time of the charge / discharge current of the battery pack 11a, and FIG. 3B is a diagram illustrating the charge / discharge current of the battery pack 11b. In addition, in the same figure, the charge / discharge current based on the power supply / reception request is also shown.

  FIG. 4A is a diagram illustrating the operation state of the connection switch 14a with respect to time, and FIG. 4B is a diagram illustrating the operation state of the connection switch 14b.

  FIG. 5A is a diagram showing the storage capacity of the battery pack 11a with respect to time, and is a diagram showing the storage capacity of the battery pack 11b in FIG. 5B.

<Charging / discharging treatment>
The charge / discharge process will be described. FIG. 6 is a flowchart showing the procedure of the charge / discharge process.

  Step SA1: When control is started, the control unit 17 sets a capacity correction flag indicating whether or not to execute capacity correction processing to “0”. When the capacity correction flag is “1”, execution of capacity correction processing is indicated, and when the capacity correction flag is “0”, capacity correction processing is not executed.

  Then, the control unit 17 determines the charge mode or the discharge mode according to the content of the power supply / reception request received from the outside, and creates a control signal using the determination result as a charge / discharge command. The generated control signal is output to the relay drive unit 15 and the voltage conversion unit 16. The control signal includes switch operation information for controlling the connection switch 14, AC / DC conversion method in the voltage converter 16, power conversion information for designating a voltage value and a current value, and charging or discharging. A charge / discharge command is included.

  For example, when the power supply / reception request indicates the charging mode, if the management capacity of the battery packs 11a and 11b is smaller than a preset specified capacity, the control unit 17 performs the battery packs 11a and 11b. It is determined that charging is necessary. This specified capacity is a preset value indicating whether or not charging is necessary.

  The switch operation information at this time is such that both the connection switches 14a and 14b are turned ON, and the power conversion information is the content that converts AC power from the power supply line 18 into DC power and supplies it to the battery packs 11a and 11b.

  When only the management capacity of the battery pack 11a is less than the specified capacity, it is determined that only the battery pack 11a needs to be charged. At this time, the switch operation information turns on the connection switch 14a and the connection switch 14b turns off, and the power conversion information includes the contents to be supplied to the battery pack 11a by converting AC power from the power supply line 18 into DC power. Become.

  On the other hand, in the discharge mode, for example, when the management capacity of the battery pack 11a is greater than the specified capacity and the management capacity of the battery pack 11b is less than the specified capacity, it is determined that the battery pack 11b cannot be discharged.

  At this time, the switch operation information turns on the connection switch 14a, and the connection switch 14b turns off, and the power conversion information is the content that converts the DC power from the battery pack 11a into AC power and supplies it to the power supply line 18. .

  Step SA2: The relay drive unit 15 acquires the switch operation information included in the control signal, and operates the connection switch 14 corresponding to the switch operation information. For example, when charging the battery packs 11a and 11b, both the connection switches 14a and 14b are turned on. At time t0 in FIGS. 4A and 4B, both the connection switches 14a and 14b are in the ON state.

  Steps SA3 and SA4: On the other hand, when acquiring the power conversion information from the control signal, the voltage conversion unit 16 self-sets to convert DC power into AC power in the discharge mode and AC power in the charge mode. Self-configure to convert to DC power.

  At this time, the voltage converter 16 adjusts the charge / discharge current. That is, when a change occurs in the number of battery packs 11 to be charged / discharged (for example, when capacity correction processing is performed), the charge / discharge amount from each battery pack 11 is adjusted to satisfy the power supply / reception request ( Power adjustment). At time t0 in FIGS. 3A and 3B, the charging currents of the battery pack 11a and the battery pack 11b are adjusted to the same value.

  Step SA5: Thereafter, the control unit 17 determines whether or not charging / discharging is to be ended, and if it is to be ended, returns to step SA1.

  Steps SA6 and SA7: On the other hand, when charging / discharging has not been completed, the control unit 17 determines whether or not the capacity correction flag is “1”. As described above, when the capacity correction flag is “1”, it indicates that the capacity correction process is requested to be interrupted. Therefore, if the capacity correction flag is “1”, an interrupt process (capacity correction process) is executed, and the process returns to step SA2.

  The reason why the process returns to step SA2 is to control the connection switch 14 in order to disconnect the battery pack 11 that performs capacity correction processing from the voltage conversion unit 16.

  At time t1 in FIGS. 4A and 4B, the connection switch 14b is turned off, and the battery pack 11b is disconnected from the load (voltage conversion unit 16). Accordingly, at time t1 in FIGS. 3A and 3B, the amount of charge of the battery pack 11a is doubled and power adjustment is performed.

<Capacity correction processing>
Next, capacity correction processing will be described. FIG. 7 is a flowchart showing the procedure of capacity correction processing. Here, as an example, the capacity of the battery pack 11b is corrected while the battery packs 11a and 11b are being charged.

  Step SB1: The controller 17 constantly monitors whether a preset capacity check criterion is satisfied. When the capacity check determination criterion is satisfied, the control unit 17 sets the capacity correction flag to “1”, and proceeds to Step SB2.

  Examples of the capacity check determination criterion include a case where a preset time has elapsed since the start of charging / discharging, a case where a regular time has elapsed, and a case where the operation time has reached a predetermined time. Moreover, you may judge from the change condition of the connection terminal voltage during charge. Furthermore, the occurrence of an event may be used as an execution condition for the capacity check execution determination.

  In the following description, it is assumed that the capacity check is performed when a preset time has elapsed since the start of charging / discharging. In FIGS. 2A, 2B, 3A, 3B, 4A, 4B, 5A, and 5B, the capacity check determination criterion is when the time t1 from the start of charge / discharge has elapsed. ing.

  Assuming that the capacity of the battery pack 11b is corrected while the battery packs 11a and 11b are being charged, the control unit 17 outputs a control signal including a capacity correction command for the battery pack 11b.

  Step SB2: When receiving this control signal, the relay drive unit 15 turns off the connection switch 14b connected to the battery pack that is the capacity correction target and disconnects it from the voltage conversion unit 16 for capacity correction processing. The connection switch 14b is in the OFF state at time t1 in FIGS. 4A and 4B.

  Step SB3: On the other hand, the voltage conversion unit 16 adjusts the power as the number of the battery packs 11 to be charged changes. The charging current of the battery pack 11a is adjusted (power adjustment) at time t1 in FIGS. 3A and 3B.

  Step SB4: The capacity management unit 13 constantly monitors the current that is input to and output from the battery pack 11. And the product (charging / discharging electric energy) of charging / discharging time and charging / discharging electric current is calculated, and the memorize | stored management capacity | capacitance is updated.

  Under such circumstances, when the capacity management unit 13 receives a control signal including a capacity correction command from the relay drive unit 15, the capacity management unit 13 waits for a predetermined time to elapse and then measures the open terminal voltage of the battery pack 11. Get from. The terminal voltage of the battery pack 11 may fluctuate for some time even if the terminal is opened.

  Therefore, it waits for a period of time until the fluctuation of the terminal voltage is settled to reach the open terminal voltage (this time is referred to as a correction standby time). In FIG. 2B, the connection switch 14b is turned off at time t1, and thereafter, the terminal voltage of the battery pack 11b is gradually settled.

  When the open terminal voltage of the battery pack 11b is acquired, the capacity management unit 13 applies the measured open terminal voltage to the voltage capacity conversion information stored in advance, and the capacity corresponding to the open terminal voltage ( Measure actual capacity).

  Step SB5: The capacity management unit 13 determines the consistency between the terminal capacity and the management capacity. If the management capacity is within an allowable range set in advance with respect to the actual measurement capacity, it is determined that the actual measurement capacity and the management capacity match. On the other hand, if it is outside the allowable range, it is determined that the management capacity has shifted.

  Such an allowable range is set as appropriate according to the structure and type of the storage battery constituting the battery pack 11, for example, the absolute value of (actually measured capacity-managed capacity) / managed capacity is 10%. Can be within the allowable range.

  Step SB6: When the management capacity is outside the allowable range with respect to the actually measured capacity, the capacity management unit 13 corrects the management capacity with the actually measured capacity and sends the corrected management capacity to the control unit 17. The control unit 17 stores the received management capacity.

  If the measured capacity is obtained without determining the coincidence between the terminal capacity and the management capacity in step SB5, the management capacity may be uniformly corrected and updated.

  Step SB7: When the capacity correction is completed, the control unit 17 sets the capacity correction flag to “0” and ends the interrupt process.

  At this time, the relay drive unit 15 turns on the connection switch 14b to return the battery pack 11b to the charging / discharging process. However, if it is unconditionally returned, the terminal voltage between the battery pack 11a and the battery pack 11b is different. In some cases, an inrush current larger than the rating may flow between the battery packs 11.

  Therefore, the control unit 17 acquires the terminal voltage from the measurement unit 12, waits until the terminal voltages of the battery pack 11a and the battery pack 11b match (hereinafter, this waiting time is referred to as a return waiting time), and relay drive. A control signal for turning on the connection switch 14b is output to the unit 15.

  As described above, the capacity correction can be performed without stopping the storage battery device 2A, and the appropriate storage capacity can be efficiently managed. And the reliability with respect to power supply / reception improves.

Second Embodiment
Next, a second embodiment of the present invention will be described. In addition, about the same structure as 1st Embodiment, description is abbreviate | omitted suitably using the same code | symbol.

  In the first embodiment, when the capacity correction processing is executed, the correction waiting time has elapsed. However, such a correction standby time is a time during which the battery pack that is the target of capacity correction does not contribute to the charge / discharge process (hereinafter referred to as capacity correction time), and it is not possible to lengthen the capacity correction time. There is a risk that the reliability (capability reliability, lifetime reliability, etc.) of the storage battery device may be reduced. Therefore, in this embodiment, the correction waiting time is shortened.

  Ideally, the correction standby time is equal to the time required for the open terminal voltage to settle (hereinafter referred to as the terminal voltage convergence time). However, in order for the capacity correction processing to be performed properly, the terminal voltage convergence time is required. Must be set to a longer time.

  The terminal voltage convergence time depends on the current value that flows when the connection switch 14 connected to the battery pack 11 is turned off. If this current value is small, the terminal voltage convergence time is also shortened. If the terminal voltage convergence time is shortened, the correction standby time can be shortened, and the capacity correction time can be shortened.

  FIG. 8 is a block diagram of the storage battery device 2B according to the present embodiment configured from such a viewpoint. The storage battery device 2B has a current limiter 19 (19a, 19b) and a limit switch 20 (20a, 20b) connected in series to the current limiter 19 in addition to the storage battery device 2A shown in FIG. Has been. The current limiter 19 and the limit switch 20 constitute a current limiter.

  Examples of the current limiter 19 include a fixed resistor, and examples of the limit switch 20 include a semiconductor switch such as a transistor and a relay.

  The current limiter 19 and the limit switch 20 are connected in series, and this connection body is connected in parallel with the connection switch 14.

  Next, operation | movement of the storage battery apparatus 2B of such a structure is demonstrated. In the following description, since charging / discharging is controlled in the same manner, charging will be described as an example.

  FIG. 9 is a flowchart showing this operation procedure. 10A is a diagram showing the operating state of the connection switch 14a, FIG. 10B is a diagram showing the operating state of the connection switch 14b on the capacity correction target side, FIG. 10C is a diagram showing the operating state of the limit switch 20a, and FIG. It is a figure which shows the operation state of the restriction | limiting switch 20b by the side of object. FIG. 11 is a diagram showing the charging current of the battery pack 11b. In FIG. 11, the solid line indicates the charging current requested to be charged / discharged, and the dotted line indicates the charging current of the battery pack 11b.

  Step SC1: The control unit 17 outputs a control signal including a charge / discharge command instructing charging of the battery packs 11a and 11b in accordance with the power supply / reception request. As a result, the relay drive unit 15 turns on the connection switches 14a and 14b and turns off the limit switches 20a and 20b to start charging the battery packs 11a and 11b (FIGS. 10A to 10D and FIG. 11). Time t0). At this time, it is assumed that charging currents Ia and Ib flow through the battery packs 11a and 11b.

  Steps SC <b> 2 to SC <b> 4: When such capacity charging is performed, if the capacity check determination criterion is satisfied, the control unit 17 outputs a control signal including a capacity correction command in order to perform capacity correction processing of the battery pack 11 b. When receiving the control signal, the relay drive unit 15 turns on the limit switch 20b on the battery pack 11b side to be corrected, and turns off the connection switch 14b. In FIG. 10A to FIG. 10D and FIG. 11, this state switching is performed at time ta.

  As a result, the charging current Ibm (Ibm <Ib) flows through the battery pack 11b via the current limiter 19. That is, the charging current of the battery pack 11b decreases. A charging current Iam (Iam> Ia) flows through the battery pack 11a. At this time, Ib−Ibm = Iam−Ia. That is, the entire charging current does not change.

  Steps SC5 and SC6: Then, the relay drive unit 15 waits for the elapse of a predetermined time (hereinafter referred to as current limit time). When the current limit time elapses, the relay drive unit 15 turns off the limit switch 20b and completely disconnects the battery pack 11b from the voltage conversion unit 16.

  Steps SC7 and SC8: When the battery pack 11b is completely disconnected, the capacity management unit waits for the correction standby time to elapse. When the correction standby time is reached, the capacity management unit obtains the measured capacity based on the open terminal voltage, and thereby corrects the managed capacity. The charging current Ibm flowing through the battery pack 11b when the battery pack 11b is disconnected is smaller than the initial charging current Ib (time t0). Accordingly, the terminal voltage convergence time at this time is shorter than the terminal voltage convergence time when the charging current Ib flows.

  10A to 10D and FIG. 11, since the terminal voltage converges at time tb and the capacity correction is performed, the relay drive unit 15 drives the limit switch 20b to the ON state. Thereby, a charging current flows into the battery pack 11b via the current limiter 19b, and charging is resumed. Assuming that the charging current Ibm at this time, the charging current Iam (= Ia + Ib−Ibm) flows through the battery pack 11a so that the entire charging current does not change.

  Step SC9: The relay drive unit 15 turns on the limit switch 20b. Thereby, charging of the battery pack 11b is resumed via the current limiter 19b.

  Steps SC10 to SC12: Then, it is determined whether or not the charging via the current limiter 19b is performed for the current limiting time. When charging is performed only for the time, the relay driving unit 15 sets the connection switch 14b to the ON state. The limit switch 20b is turned off. As a result, the battery pack 11b is charged without going through the current limiter. 10A to 10D and FIG. 11, the limit switch 20b is in the OFF state at time t3.

  Steps SC13 and SC14: Thereafter, completion of charging / discharging is determined, and when completed, all of the connection switch 14 and the limit switch 20 are turned off.

  Such a series of operations makes it possible to correct and update the storage capacities of a plurality of battery packs while satisfying the power supply / reception request and shortening the capacity correction time.

<Third Embodiment>
Next, a third embodiment of the present invention will be described. In addition, about the same structure as 1st, 2 embodiment, description is abbreviate | omitted suitably using the same code | symbol.

  In the first embodiment, when the capacity correction process is executed, the waiting time for the correction standby time is awaited and the terminal voltages of the plurality of battery packs are waited for (the waiting for the return waiting time has elapsed). This is to prevent an inrush current larger than the rating from flowing between the battery packs 11 having different terminal voltages. In the present embodiment, the correction waiting time is shortened.

  FIG. 12 is a block diagram of a storage battery device 2C according to the present embodiment. The current limiter of the storage battery device 2B shown in FIG. 8 was a fixed resistor. On the other hand, the current limiter of the storage battery device 2C according to the present embodiment is configured by a constant current circuit. That is, the current limiting unit in the present embodiment includes the limit switch 20 (20a, 20b) and the constant current circuit 21 (21a, 21b).

  The constant current circuit 21 (21a, 21b) functions to flow a set current for a current less than a predetermined current value (maximum allowable current), but for a current greater than the maximum allowable current, And has a function of limiting to the maximum allowable current.

  Operation | movement of 2 C of storage battery apparatuses of such a structure is demonstrated. In the following description, since charging / discharging is controlled in the same manner, charging will be described as an example.

FIG. 13 is a flowchart showing this operation procedure. 14A is a diagram showing the operating state of the connection switch 14a, FIG. 14B is a diagram showing the operating state of the connection switch 14b on the capacity correction target side, FIG. 14C is a diagram showing the operating state of the limit switch 20a, and FIG. It is a figure which shows the operation state of the restriction | limiting switch 20b on the object side.
The limit switch 20 is driven by the relay drive unit 15.

  FIG. 15 is a diagram showing the charging current of the battery pack 11b. In FIG. 15, the solid line indicates the charging current requested to be charged / discharged, and the dotted line indicates the charging current of the battery pack 11b.

  Step SD1: The control unit 17 outputs a control signal instructing charging of the battery packs 11a and 11b according to the power supply / reception request. The relay drive unit 15 turns on the connection switches 14a and 14b and turns off the limit switches 20a and 20b based on the charge / discharge command included in the control signal. Thereby, charging of the battery packs 11a and 11b is started (time t0 in FIGS. 14A to 14D and FIG. 15). At this time, it is assumed that charging currents Ia and Ib flow through the battery packs 11a and 11b.

  Steps SD2 and SD3: When the capacity check determination criteria are satisfied during such charging, the control unit 17 outputs a control signal including a capacity correction command in order to perform the capacity correction processing of the battery pack 11b. When receiving the capacity correction command, the relay drive unit 15 turns off the connection switch 14b on the battery pack 11b side to be corrected. In FIG. 15, this state switching is performed at time t1.

  Steps SD4 and SD5: Thereby, the battery pack 11b is completely disconnected from the voltage converter 16, and the terminal voltage of the battery pack 11b converges to the open terminal voltage. A charging current of Ia + Ib flows through the battery pack 11a. In this state, the capacity management unit waits for the correction standby time to elapse, and performs capacity correction after the time.

  Step SD6: Next, the relay drive unit 15 turns on the limit switch 20b. Thereby, the constant current circuit 21b sets the charging current of the battery pack 11b as the maximum allowable current. The maximum allowable current at this time can be set to the same current value as the current value flowing through the battery pack 11a.

  This means that the potential at the connection point K (see FIG. 12) viewed from the voltage converter 16 can be regarded as the same potential. Therefore, even if the terminal voltages of the battery packs 11a and 11b are different, the inrush current can be prevented from flowing between the battery packs 11a and 11b.

  Therefore, since the battery pack 11b to be corrected returns immediately after the capacity correction processing via the limit switch 20b, the return standby time can be shortened.

  Steps SD7 to SD9: Then, the relay drive unit 15 waits until the terminal voltage of the battery pack 11b matches the terminal voltage of the battery pack 11a, and when these terminal voltages match, the connection switch 14a is turned on and the limit switch 20b is turned off. Put it in a state.

With such a series of operations, charging / discharging can be performed with the maximum allowable current immediately after capacity correction while satisfying the power supply / reception request, and the return waiting time can be shortened.
While the present invention has been described with reference to the embodiments (and examples), the present invention is not limited to the above embodiments (and examples). Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention.
This application claims the priority on the basis of Japanese application Japanese Patent Application No. 2015-051809 for which it applied on March 16, 2015, and takes in those the indications of all here.

2A to 2C storage battery device 11 (11a, 11b) Battery pack 12 (12a, 12b) Measurement unit 13 (13a, 13b) Capacity management unit 14 (14a, 14b) Connection switch 15 Relay drive unit 16 Voltage conversion unit 17 Control unit 18 Feed line 19 (19a, 19b) Current limiter (fixed resistor)
20 (20a, 20b) Limit switch 21 (21a, 21b) Current limiter (constant current circuit)

Claims (9)

A storage battery device for charging and discharging a plurality of battery packs,
A connection switch that is provided for each battery pack and that controls connection between the battery pack and a load, a measurement unit that measures at least the open terminal voltage of the battery pack, and the open terminal voltage are stored in advance. A capacity management unit including a capacity management unit that calculates the actual capacity of the battery pack by applying to the voltage capacity conversion information, and corrects and updates the management capacity already stored based on the actual capacity;
A control unit that outputs a control signal including a charge / discharge command and a capacity correction command for charging / discharging the battery pack in response to an external power supply / reception request;
A relay drive unit that turns the connection switch on and off based on the control signal, and
When the control unit performs capacity correction on one of the plurality of battery packs, the controller outputs the capacity correction command for causing at least one of the plurality of capacity management units to perform capacity correction, and When receiving the capacity correction command, the relay drive unit turns off the connection switch connected to the battery pack whose capacity is to be corrected, and the capacity management unit converts the open terminal voltage from the measurement unit to the voltage capacity. A storage battery device characterized in that the measured capacity is calculated by applying to conversion information, and the management capacity is corrected and updated by the measured capacity. The storage battery device according to claim 1,
A storage battery device comprising: a current limiting unit including a limit switch connected in parallel to the connection switch, and a fixed resistor or a current limiter of a constant current circuit connected in series with the limit switch. The storage battery device according to claim 2,
When the capacity correction process is performed when the current limiter is a fixed resistor, the relay driving unit sets the connection switch connected to the battery pack whose capacity is to be corrected to an OFF state and the limit switch to an ON state. Set and wait for the elapse of a predetermined current limit time. After the current limit time elapses, the limit switch is turned off so that the capacity correction process can be performed, and immediately after the capacity correction process is completed, the limit switch is turned on. The storage battery device is characterized by waiting for the elapse of a predetermined return waiting time, and when the return waiting time elapses, the connection switch is turned on and the limit switch is turned off. The storage battery device according to claim 2,
When the capacity correction process is performed when the current limiter is a constant current circuit, the relay drive unit performs the predetermined current limit time elapse when the capacity correction process is performed. After the elapse of the current limit time, the limit switch is turned on so that the capacity correction process can be performed. Immediately after the capacity correction process is completed, the limit switch is turned on so that a predetermined return waiting time has elapsed. Waiting, and when the return waiting time has elapsed, the connection switch is turned on and the limit switch is turned off. The storage battery device according to any one of claims 1 to 4,
When the load supplies power from the battery pack to the outside, the DC power is converted from AC power, and when the power is supplied from the outside to the battery pack, the voltage conversion unit converts AC power to DC power,
When the capacity correction process is performed, the voltage conversion unit allocates the power received and supplied by the battery pack that is the target of the capacity correction process to the other battery pack before the capacity correction process. A storage battery device. A capacity correction method in a storage battery device for charging and discharging a plurality of battery packs,
A connection switch included in a capacity management unit provided for each battery pack to control connection between the battery pack and a load;
Measure at least the open terminal voltage of the battery pack by the measurement unit,
The open circuit voltage is applied to the voltage capacity conversion information stored in advance by the capacity management unit to calculate the actual capacity of the battery pack, and the management capacity already stored is corrected and updated based on the actual capacity. And the steps to
A procedure for outputting a control signal including a charge / discharge command and a capacity correction command for charging / discharging the battery pack in response to an external power supply / reception request by the control unit;
And a procedure for turning on / off the connection switch based on the control signal by a relay drive unit,
When performing capacity correction on at least one of the plurality of battery packs,
The control unit outputs the capacity correction command to perform capacity correction on one of the plurality of capacity management units,
When the relay drive unit receives the capacity correction command, the relay drive unit turns off the connection switch connected to the battery pack for capacity correction,
The capacity management unit applies the open terminal voltage from the measurement unit to the voltage-capacitance conversion information to calculate the actual capacity, and corrects and updates the management capacity with the actual capacity. Correction method. The capacity correction method according to claim 6,
When performing the capacity correction process when the limit switch connected in parallel with the connection switch and the current limiter connected in series with the limit switch are fixed resistors,
The relay driving unit sets the connection switch connected to the battery pack whose capacity is to be corrected to an OFF state, sets the limit switch to an ON state, and waits for a predetermined current limit time to elapse.
After the current limit time has elapsed, the limit switch is turned off so that the capacity correction process can be performed.
Immediately after the capacity correction process is completed, the limit switch is turned on to wait for a predetermined return waiting time,
A capacity correction method, wherein when the return waiting time has elapsed, the connection switch is turned on and the limit switch is turned off. The capacity correction method according to claim 6,
When performing the capacity correction process when the limit switch connected in parallel with the connection switch and the current limiter connected in series with the limit switch are a constant current circuit,
The relay drive unit waits for the elapse of a predetermined current limit time,
After the current limit time has elapsed, the limit switch is turned on so that capacity correction processing can be performed.
Immediately after the capacity correction process is completed, the limit switch is turned on to wait for a predetermined return waiting time,
A capacity correction method, wherein when the return waiting time has elapsed, the connection switch is turned on and the limit switch is turned off. The capacity correction method according to any one of claims 6 to 8,
When the load supplies power from the battery pack to the outside, the voltage conversion unit converts DC power to AC power and converts power from the outside to DC power when power is supplied to the battery pack from the outside. When the battery pack is performed, the battery pack that is the target of the capacity correction process allocates the power supplied / received before the capacity correction process to the other battery pack.

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