JP6369800B2 - Power storage system and method for controlling power storage system - Google Patents

Description

  The present invention relates to a power storage system and the like for controlling electric energy.

  Patent Document 1 discloses a variable disconnection device and a variable disconnection device that switch to a low capacity, low voltage state by variably disconnecting or controlling connection of a switch for each battery unit of a large battery system in accordance with the degree of danger of a sensed external situation. The disconnection control method is shown.

Special table 2013-546119 gazette

  However, in an electricity storage system including a plurality of storage battery packs and charging / discharging devices, wiring for communication between the plurality of storage battery packs and the charging / discharging devices becomes complicated, and charging / discharging of the plurality of storage battery packs is appropriately performed. It may be difficult to control.

  Therefore, a power storage system and the like that can appropriately control charging and discharging of a plurality of storage battery packs are provided.

An electricity storage system according to an aspect of the present invention includes a plurality of storage battery packs, and a charge / discharge device that performs charge / discharge that is at least one of charging and discharging of the plurality of storage battery packs, and each of the plurality of storage battery packs. Includes a secondary battery, a switch connected in series to the secondary battery in the power path for charging and discharging, and a first communication unit that performs wireless communication with the charging and discharging device, and the charging and discharging device, a charge-discharge unit to perform the charge and discharge, a second communication unit for performing said plurality of storage battery packs and a wireless communication, when the have a plurality of battery packs is the charging and discharging by the charging and discharging unit, the to identify a connection relationship of a plurality of storage batteries packs, via the second communication unit opens the first switch is the switch of the first battery pack of (i) the plurality of battery packs, (ii Subsequently, the first switch is closed, (iii) Subsequently, among the plurality of storage battery packs, a second switch that is a switch of a second storage battery pack different from the first storage battery pack is opened, and (iv) And a controller for closing the second switch.

  Note that these comprehensive or specific aspects may be realized by a non-transitory recording medium such as an apparatus, a method, an integrated circuit, a computer program, or a computer-readable CD-ROM. The present invention may be realized by any combination of an integrated circuit, a computer program, and a recording medium.

  The power storage system and the like according to one embodiment of the present invention can appropriately control charging and discharging of the plurality of storage battery packs.

FIG. 1 is a block diagram illustrating a configuration of the power storage system in the first embodiment. FIG. 2 is a flowchart showing the operation of the power storage system in the first embodiment. FIG. 3 is a conceptual diagram of the power storage system in the second embodiment. FIG. 4 is a circuit diagram of the storage battery pack in the second embodiment. FIG. 5 is a configuration diagram of a power storage system in the second embodiment. FIG. 6 is a diagram showing a plurality of storage battery packs in the second embodiment. FIG. 7 is a diagram showing a first state of a plurality of storage battery packs in the second embodiment. FIG. 8 is a diagram showing a second state of the plurality of storage battery packs in the second embodiment. FIG. 9 is a diagram showing a third state of the plurality of storage battery packs in the second embodiment. FIG. 10 is a diagram showing a connection relationship between a plurality of storage battery packs in the second embodiment. FIG. 11 is a flowchart showing the operation of the power storage system in the second embodiment. FIG. 12 is a flowchart showing the sequence confirmation processing in the second embodiment. FIG. 13 is a configuration diagram of a power storage system in the third embodiment. FIG. 14 is a flowchart showing the operation of the power storage system in the third embodiment.

(Knowledge that became the basis of the present invention)
This inventor discovered the subject regarding an electrical storage system provided with a some storage battery pack. This will be specifically described below.

  In a power storage system including a plurality of storage battery packs and charging / discharging devices, each of the plurality of storage battery packs and the charging / discharging device may communicate with each other. For example, the charging / discharging device receives information such as a current value, a voltage value, and a temperature in the storage battery pack from the storage battery pack. The charging / discharging device notifies the information received from the storage battery pack to the outside, stops charging / discharging the storage battery pack, or starts charging / discharging the storage battery pack.

  As a specific configuration of the power storage system, for example, each of a plurality of storage battery packs and a charging / discharging device are connected to each other via a physical power line for charging / discharging, and further, a physical for communication They are connected to each other via a communication line. The charge / discharge device may include a plurality of physical terminals in order to communicate with each of the plurality of storage battery packs.

  However, in the configuration corresponding to such wired communication, wiring may be complicated between the plurality of storage battery packs and the charging / discharging device or inside the charging / discharging device. For this reason, there is a possibility that the failure of the power storage system increases or the manufacturing cost increases.

  Therefore, an electricity storage system according to an aspect of the present invention includes a plurality of storage battery packs, and a charge / discharge device that performs charge / discharge that is at least one of charging and discharging of the plurality of storage battery packs, and the plurality of storage battery packs. Each includes a secondary battery, a switch connected in series to the secondary battery in the power path for charging and discharging, and a first communication unit that performs wireless communication with the charging / discharging device, The charging / discharging device includes a charging / discharging unit that performs the charging / discharging, a second communication unit that performs wireless communication with the plurality of storage battery packs, and energizing the plurality of storage battery packs by performing the charging / discharging on the charging / discharging unit. And during the energization of the plurality of storage battery packs, (i) open the first switch that is the switch of the first storage battery pack among the plurality of storage battery packs, and (ii) continue The Close the first switch, and (iii) then open a second switch that is a switch of the second storage battery pack different from the first storage battery pack among the plurality of storage battery packs, and (iv) continue, And a controller for closing the second switch.

  Thereby, since wireless communication is used for communication with a plurality of storage battery packs, wiring is simplified. Further, during energization, the first switch of the first storage battery pack and the second switch of the second storage battery pack are sequentially switched via wireless communication. For example, it is possible to determine that a storage battery pack whose state varies according to the switching of the first switch of the first storage battery pack is electrically connected in series to the first storage battery pack.

  Therefore, by sequentially switching these switches during energization, it is possible to determine which storage battery pack is connected in series to each of these storage battery packs. The power storage system then charges the plurality of storage battery packs based on the connection relationship, such as opening a switch of the storage battery pack that is connected in series to the abnormal storage battery pack and charging / discharging the plurality of storage battery packs. The discharge can be appropriately controlled.

  For example, the second storage battery pack may be different from the storage battery pack in which the current value of the power path varies according to the switching of the first switch.

  Thereby, following the switching of the first switch of the first storage battery pack, the second switch of the second storage battery pack that is assumed not to be electrically connected in series to the first storage battery pack is switched. Therefore, it is possible to specify the connection relationship efficiently.

  Further, for example, each of the plurality of storage battery packs may include a current sensor that measures a current value of the power path.

  Accordingly, it is possible to appropriately specify the connection relationship based on the measured current value.

  For example, the first communication unit may transmit the current value of the power path to the charge / discharge device.

  Thereby, the charging / discharging apparatus can specify the storage battery pack electrically connected in series with respect to the 1st storage battery pack or the 2nd storage battery pack based on the electric current value received from each storage battery pack.

  In addition, for example, the first communication unit is configured such that a current value of the power path in the storage battery pack including the first communication unit is the switch of one of the first storage battery pack and the second storage battery pack. When it fluctuates according to switching, you may transmit the 1st identification information which shows the said storage battery pack provided with a said 1st communication part to the said charging / discharging apparatus.

  Thereby, the charging / discharging apparatus can specify the storage battery pack electrically connected in series with respect to the 1st storage battery pack or the 2nd storage battery pack based on identification information.

  In addition, for example, when the first communication unit receives, from the charge / discharge device, second identification information indicating the storage battery pack whose switch has been switched, and transmits the first identification information, the first identification information and The second identification information may be transmitted.

  Thereby, the storage battery pack can transmit the identification information received from the charging / discharging device as the identification information indicating the storage battery pack whose switch has been switched.

  In addition, for example, when the first communication unit receives second identification information indicating the storage battery pack with the switch switched from the storage battery pack with the switch switched, and transmits the first identification information, The identification information and the second identification information may be transmitted.

  Thereby, the storage battery pack can transmit the identification information received from the storage battery pack whose switch is switched as the identification information indicating the storage battery pack whose switch is switched.

  Further, for example, the control unit replaces the one storage battery with a storage battery pack in which a current value of the power path varies according to switching of the switch of one of the first storage battery pack and the second storage battery pack. You may output the arrangement | sequence information shown as a storage battery pack connected in series with the pack.

  Thereby, the electrical storage system can output the arrangement | sequence information relevant to the connection relation of a some storage battery pack as information which shows the state of a some storage battery pack.

  Also, for example, the second communication unit communicates with an external communication terminal including a display unit, and the control unit transmits the array information to the display unit of the external communication terminal via the second communication unit. The sequence information may be output by displaying on the screen.

  Thereby, the electrical storage system can display arrangement | sequence information on the screen of a smart phone, for example.

  In addition, for example, the charge / discharge device further includes an abnormality determination unit that determines whether each of the plurality of storage battery packs is in an abnormal state, and the control unit further includes the plurality of storage battery packs. The switch of each of one or more storage battery packs among the plurality of storage battery packs may be opened according to the storage battery pack determined to be in an abnormal state by the abnormality determination unit.

  Thereby, the charging / discharging apparatus can control charging / discharging according to whether each storage battery pack is in an abnormal state.

  For example, the control unit may open the switch of the storage battery pack that is determined to be in an abnormal state by the abnormality determination unit.

  Thereby, the switch of the storage battery pack which is in an abnormal state is opened. Therefore, the charging / discharging apparatus can control charging / discharging so that charging / discharging is not performed with respect to the storage battery pack which is in an abnormal state.

  Further, for example, the control unit may determine whether the storage battery pack in which the current value of the power path fluctuates according to the switching of the switch of one of the first storage battery pack and the second storage battery pack is the abnormality determination. When it is determined that the battery is in an abnormal state, the switch of another storage battery pack in which the current value of the power path fluctuates in response to switching of the switch of the one storage battery pack may be opened.

  Thereby, the switch of the storage battery pack assumed to be electrically connected in series to the storage battery pack in an abnormal state is opened. Therefore, the charging / discharging apparatus can control charging / discharging so that charging / discharging is not performed with respect to the storage battery pack which is in an abnormal state.

  For example, the second communication unit receives abnormality information from a storage battery pack that is in an abnormal state among the plurality of storage battery packs, and the abnormality determination unit is based on the abnormality information received by the second communication unit. Then, it may be determined whether or not each of the plurality of storage battery packs is in an abnormal state.

  Thereby, the charging / discharging apparatus can determine appropriately whether the storage battery pack is in an abnormal state based on the information received from the storage battery pack.

  In addition, for example, each of the plurality of storage battery packs further includes an individual control unit that controls switching of the switch, and the first communication unit is abnormal from the storage battery pack that is in an abnormal state among the plurality of storage battery packs. Receiving the information, the individual control unit is configured such that a storage battery pack including the individual control unit is configured to switch the power path according to switching of the switch of one of the first storage battery pack and the second storage battery pack. The first communication unit of the storage battery pack, which is a storage battery pack with a variable current value and includes the individual control unit, changes the current value of the power path according to switching of the switch of the one storage battery pack. When the abnormality information is received from another storage battery pack that performs, the switch of the storage battery pack including the individual control unit may be opened.

  Thereby, when it is assumed that the storage battery pack is electrically connected in series to the storage battery pack that is in an abnormal state, it is possible to open its own switch. Therefore, charge / discharge can be controlled such that the storage battery pack is not charged / discharged with respect to the storage battery pack in an abnormal state.

  In addition, for example, the charging / discharging device may further include a connection unit that detachably connects each of the plurality of storage battery packs.

  Thereby, it is possible to mutually replace a plurality of storage battery packs. That is, it is possible to freely change the connection relationship of the plurality of storage battery packs.

  In addition, for example, the charging / discharging device further includes a mounting detection unit that detects mounting of each of the plurality of storage battery packs, and the control unit detects that at least one of the plurality of storage battery packs is mounted. The plurality of storage battery packs are energized, the first switch is opened while the plurality of storage battery packs are energized, the first switch is closed, the second switch is opened, and the second switch May be closed.

  Thereby, it is possible to specify the changed connection relation at the timing when the connection relation of the plurality of storage battery packs is changed.

  Further, for example, when the charging / discharging unit starts the charging / discharging, the control unit energizes the plurality of storage battery packs, and opens the first switch during energization of the plurality of storage battery packs. The first switch may be closed, the second switch may be opened, and the second switch may be closed.

  Thereby, it is possible to specify the connection relationship of a some storage battery pack at the timing when charging / discharging is started.

  Further, for example, the control unit indicates a difference between two charging states of two storage battery packs in which a current value of the power path varies according to switching of one of the first switch and the second switch. If the value is not within the predetermined range, a warning may be output.

  Thereby, the electrical storage system can output a warning when charging / discharging is not performed appropriately.

  Further, for example, the second communication unit communicates with an external communication terminal including a display unit, and the control unit sends the warning to the display unit of the external communication terminal via the second communication unit. The warning may be output by displaying.

  Thereby, for example, the power storage system can display a warning on the screen of the smartphone.

  In addition, these comprehensive or specific aspects may be realized by a non-transitory recording medium such as an apparatus, a method, an integrated circuit, a computer program, or a computer-readable CD-ROM. The present invention may be realized by any combination of an integrated circuit, a computer program, or a recording medium.

  Hereinafter, embodiments will be specifically described with reference to the drawings. It should be noted that each of the embodiments described below shows a comprehensive or specific example. The numerical values, shapes, materials, constituent elements, arrangement positions and connecting forms of the constituent elements, steps, order of steps, and the like shown in the following embodiments are merely examples, and are not intended to limit the present invention. In addition, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims indicating the highest concept are described as optional constituent elements.

  Here, charging / discharging is at least one of charging and discharging. The expression charge / discharge may be replaced by charge or discharge. Opening the switch means turning off the switch, and closing the switch means turning on the switch. The connection includes not only direct connection but also connection through a power line or the like.

(Embodiment 1)
FIG. 1 is a block diagram illustrating a configuration of a power storage system in the present embodiment. The power storage system 100 shown in FIG. 1 is a power storage system for controlling electrical energy, and includes storage battery packs 110a, 110b, 110c, and a charge / discharge device 120.

  The storage battery pack 110a includes a secondary battery 111a, a switch 112a, and a communication unit 113a. The storage battery pack 110b includes a secondary battery 111b, a switch 112b, and a communication unit 113b. The storage battery pack 110c includes a secondary battery 111c, a switch 112c, and a communication unit 113c.

  The secondary battery 111a is a secondary battery in which electric energy is stored, and is also called a storage battery or a rechargeable battery. The kind of secondary battery 111a is not limited and may be any kind.

  When charging / discharging is performed with respect to the storage battery pack 110a, charging / discharging is performed with respect to the secondary battery 111a. The secondary battery 111a is charged to store electrical energy in the secondary battery 111a, and the secondary battery 111a is discharged to discharge electrical energy from the secondary battery 111a. The secondary batteries 111b and 111c are the same components as the secondary battery 111a.

  The switch 112a is a switch connected in series with the secondary battery 111a in the power path for charging and discharging. When the switch 112a is opened, the storage battery pack 110a (secondary battery 111a) cannot be charged / discharged. When the switch 112a is closed, the storage battery pack 110a (secondary battery 111a) can be charged / discharged. is there. The switches 112b and 112c are the same components as the switch 112a.

  The communication unit 113a is, for example, a communication interface unit having an antenna, and performs wireless communication with the charge / discharge device 120. More specifically, the communication unit 113a performs wireless communication with the communication unit 123 of the charge / discharge device 120. And the communication part 113a transmits information to the charging / discharging apparatus 120 by wireless communication, and receives information from the charging / discharging apparatus 120. The method of wireless communication is not limited, and any method may be used. The communication units 113b and 113c are the same components as the communication unit 113a.

  The charging / discharging device 120 is a charging / discharging device that charges / discharges the storage battery packs 110a, 110b, 110c, and includes a charging / discharging unit 121, a control unit 122, and a communication unit 123.

  The charging / discharging part 121 is a charging / discharging part which charges / discharges the storage battery packs 110a, 110b, 110c. Specifically, the charging / discharging unit 121 performs charging / discharging by being controlled by the control unit 122. The charging / discharging unit 121 includes a DC / AC inverter that converts direct current into alternating current, an AC / DC converter that converts alternating current into direct current, or a bidirectional inverter that mutually converts direct current and alternating current. It may be. Here, DC means a direct current (direct current), and AC means an alternating current (alternating current).

  For example, the charging / discharging unit 121 acquires an alternating current from the outside during charging, converts the alternating current into a direct current, and supplies the direct current to the storage battery packs 110a, 110b, and 110c. Moreover, the charging / discharging part 121 acquires a direct current from the storage battery pack 110a, 110b, 110c in the case of discharge, converts a direct current into an alternating current, and supplies an alternating current outside.

  The control unit 122 is a control unit that controls the operation of the charging / discharging unit 121 and the operation of the communication unit 123. For example, the control unit 122 causes the charging / discharging unit 121 to charge / discharge the storage battery packs 110a, 110b, 110c. Further, the control unit 122 causes the communication unit 123 to perform wireless communication with each of the storage battery packs 110a, 110b, and 110c.

  The communication unit 123 is a communication interface unit having an antenna, for example, and performs wireless communication with each of the storage battery packs 110a, 110b, and 110c. More specifically, the communication unit 123 performs wireless communication with each of the communication units 113a, 113b, and 113c of the storage battery packs 110a, 110b, and 110c. And the communication part 123 transmits information to each of the storage battery packs 110a, 110b, 110c by wireless communication, and receives information from each of the storage battery packs 110a, 110b, 110c.

  In addition, the charging / discharging apparatus 120 and the charging / discharging part 121 may respond | correspond only to charge among charge and discharge, and may respond only to discharge. That is, the charging / discharging device 120 may be a charging device or a discharging device. The charging / discharging unit 121 may be a charging unit or a discharging unit. The charging device and the charging unit may be expressed as a charger. Similarly, the discharge device and the discharge unit may be expressed as a discharger.

  FIG. 2 is a flowchart showing an operation of power storage system 100 shown in FIG. In FIG. 2, the operation of the control unit 122 of the charging / discharging device 120 included in the power storage system 100 is mainly shown.

  First, the control unit 122 causes the charging / discharging unit 121 to charge / discharge to energize the storage battery packs 110a, 110b, 110c (S101).

  Next, the control unit 122 controls the opening and closing of the switches 112a, 112b, and 112c of the storage battery packs 110a, 110b, and 110c via the communication unit 123 during energization of the storage battery packs 110a, 110b, and 110c (S102).

  Specifically, the control unit 122 opens and closes one of the switches 112a, 112b, and 112c. Thereafter, the control unit 122 opens and closes another switch among the switches 112a, 112b, and 112c. For example, the switch 112a is opened, the switch 112a is closed, the switch 112b is opened, and the switch 112b is closed.

  As shown in FIG. 1, in the present embodiment, each of storage battery packs 110a, 110b, and 110c and charging / discharging device 120 communicate with each other wirelessly. Thereby, the wiring for communication is simplified.

  On the other hand, since the charging / discharging device 120 communicates with each of the storage battery packs 110a, 110b, 110c wirelessly, it is difficult for the charging / discharging device 120 to specify the respective positions of the storage battery packs 110a, 110b, 110c. And it is difficult for the charging / discharging device 120 to specify the electrical connection relationship of the storage battery packs 110a, 110b, 110c based on the respective positions of the storage battery packs 110a, 110b, 110c.

  Therefore, as illustrated in FIG. 2, the control unit 122 of the charging / discharging device 120 opens any of the switches 112 a, 112 b, and 112 c of the storage battery packs 110 a, 110 b, and 110 c through wireless communication during energization. Close. For example, when the switch 112a of the storage battery pack 110a is switched, the storage battery pack whose state changes among the storage battery packs 110b and 110c is electrically connected in series to the storage battery pack 110a. It is possible to judge.

  Therefore, the control unit 122 of the charging / discharging device 120 can identify a plurality of storage battery packs that are electrically connected in series among the storage battery packs 110a, 110b, and 110c based on the above-described operation. And the control part 122 of the charging / discharging apparatus 120 can control charging / discharging appropriately, such as opening a switch of the storage battery pack connected to an abnormal storage battery pack, and performing charging / discharging based on a connection relationship. it can.

  In the present embodiment, three storage battery packs 110a, 110b, and 110c are shown. However, the number of storage battery packs is not limited to three, and may be two or four or more. In the present embodiment, an example in which the opening / closing of the switch 112b is switched after the opening / closing of the switch 112a is switched is shown. However, the switch to be switched, the order of switching, and the number of times of switching are not limited to such an example. For example, when it is possible to specify the connection relationship with one switching, only one switching may be performed.

(Embodiment 2)
In this embodiment, a more specific configuration example of the power storage system corresponding to Embodiment 1 will be described.

  FIG. 3 is a conceptual diagram of the power storage system in the present embodiment. The power storage system 200 shown in FIG. 3 includes a plurality of storage battery packs 210 and a charge / discharge device 220. The plurality of storage battery packs 210 correspond to the storage battery packs 110a, 110b, and 110c of the first embodiment. Charging / discharging device 220 corresponds to charging / discharging device 220 of the first embodiment.

  Each of the plurality of storage battery packs 210 has a connection part 211, and the charging / discharging device 220 has a connection part 221. The connection part 211 and the connection part 221 are physically connected to each other in a detachable manner, whereby each of the plurality of storage battery packs 210 and the charge / discharge device 220 are physically detachably connected to each other.

  Further, the charging / discharging device 220 includes a sensor 222 that detects physical attachment or physical removal of each of the plurality of storage battery packs 210. The sensor 222 is also expressed as an attachment / detachment detection unit or a mounting detection unit.

  The user of the power storage system 200 can replace each of the plurality of storage battery packs 210 with another storage battery pack. For example, the user of the power storage system 200 may replace a storage battery pack whose product life has expired among the plurality of storage battery packs 210 with a new storage battery pack.

  Each of the plurality of storage battery packs 210 and the charging / discharging device 220 perform wireless communication with each other. The charging / discharging device 220 can identify the storage battery pack corresponding to the received information by receiving information including the identification information of the storage battery pack from each of the plurality of storage battery packs 210 by wireless communication. On the other hand, the charging / discharging device 220 is physically connected to each of the plurality of storage battery packs 210, but does not exchange information with each of the plurality of storage battery packs 210 via the connection unit 221.

  As a result, wiring is simplified, failure can be prevented, and manufacturing costs can be reduced. However, it is difficult for the charging / discharging device 220 to specify the physical arrangement of each of the plurality of storage battery packs 210, and the charging / discharging device 220 is electrically connected to the plurality of storage battery packs 210 based on the physical arrangement. It is difficult to identify relationships.

  Therefore, the charging / discharging device 220 specifies the electrical connection relationship of the plurality of storage battery packs 210 based on the same operation as in the first embodiment. Hereinafter, the configuration and operation according to the present embodiment will be described in more detail.

  FIG. 4 is a circuit diagram corresponding to each of the plurality of storage battery packs 210 shown in FIG. Each of the plurality of storage battery packs 210 includes a positive electrode terminal 212, a switch 213, a secondary battery 214, sensors 215 and 216, a control unit 217, a negative electrode terminal 218, and a communication unit 219. Although not shown in FIG. 4, each of the plurality of storage battery packs 210 has a connection portion 211 as shown in FIG. 3.

  The positive electrode terminal 212 corresponds to the positive electrode of the storage battery pack. The positive terminal 212 is connected to the charging / discharging device 220 or the negative electrode of another storage battery pack via a power line.

  The switch 213 is a switch connected in series to the secondary battery 214 in the power path for charging and discharging. When the switch 213 is opened, charging / discharging of the storage battery pack (secondary battery 214) is impossible, and when the switch 213 is closed, charging / discharging of the storage battery pack (secondary battery 214) is possible. The switch 213 corresponds to the switches 112a, 112b, and 112c of the first embodiment.

  The secondary battery 214 is a secondary battery in which electric energy is stored, and is also called a storage battery or a rechargeable battery. When the secondary battery 214 is charged, electrical energy is stored in the secondary battery 214, and when the secondary battery 214 is discharged, electrical energy is released from the secondary battery 214. Secondary battery 214 corresponds to secondary batteries 111a, 111b, and 111c of the first embodiment.

  The sensor 215 measures the voltage value of the storage battery pack (secondary battery 214) and the temperature of the storage battery pack (secondary battery 214). The sensor 215 may include a voltage sensor that measures a voltage value and a temperature sensor that measures temperature.

  The sensor 216 is a current sensor that measures the current value of the power path in the storage battery pack. Specifically, the sensor 216 measures the current value of the power path for charging and discharging.

  The control unit 217 acquires a voltage value, a temperature, a current value, and the like from the sensors 215 and 216. Control unit 217 communicates with charging / discharging device 220 and other storage battery packs via communication unit 219. The control unit 217 controls opening / closing of the switch 213. The control unit 217 may be expressed as an individual control unit in order to individually control the storage battery pack.

  Specifically, the control unit 217 may transmit the voltage value, temperature, current value, and the like to the charging / discharging device 220 and other storage battery packs via the communication unit 219. The control unit 217 may control opening / closing of the switch 213 based on the voltage value, temperature, current value, and the like. The control unit 217 may receive information from the charging / discharging device 220 and other storage battery packs via the communication unit 219, and may control the opening / closing of the switch 213 based on the received information.

  The negative electrode terminal 218 corresponds to the negative electrode of the storage battery pack. The negative electrode terminal 218 is connected to the charge / discharge device 220 or the positive electrode of another storage battery pack via a power line.

  The communication unit 219 is a communication interface unit having an antenna, for example, and performs wireless communication with the charge / discharge device 220. Specifically, the communication unit 219 transmits information to the charging / discharging device 220 and receives information from the charging / discharging device 220 by wireless communication. The communication unit 219 corresponds to the communication units 113a, 113b, and 113c of the first embodiment.

  FIG. 5 is a configuration diagram of power storage system 200 shown in FIG. As described above, the power storage system 200 includes a plurality of storage battery packs 210 and a charge / discharge device 220. In FIG. 5, the charging / discharging device 220 includes a charging / discharging unit 223, a control unit 224, and a communication unit 225. Then, the charging / discharging device 220 performs charging / discharging of the plurality of storage battery packs 210. Although not shown in FIG. 5, as shown in FIG. 3, the charging / discharging device 220 includes a connection unit 221 and a sensor 222.

  The charging / discharging unit 223 is controlled by the control unit 224 to charge / discharge the plurality of storage battery packs 210. The charging / discharging unit 223 includes a DC / AC inverter that converts direct current into alternating current, an AC / DC converter that converts alternating current into direct current, or a bidirectional inverter that mutually converts direct current and alternating current. It may be. The charging / discharging unit 223 may include a discharging unit corresponding to the DC / AC inverter and a charging unit corresponding to the AC / DC converter. Charging / discharging unit 223 corresponds to charging / discharging unit 121 of the first embodiment.

  The control unit 224 controls the operation of the charge / discharge unit 223 and the operation of the communication unit 225. For example, the control unit 224 causes the charge / discharge unit 223 to charge / discharge the plurality of storage battery packs 210. In addition, the control unit 224 causes the communication unit 225 to perform wireless communication with each of the plurality of storage battery packs 210. The control unit 224 corresponds to the control unit 122 of the first embodiment. Control unit 224 included in charging / discharging device 220 may be expressed as a centralized control unit in order to distinguish from control unit 217 included in each of a plurality of storage battery packs 210.

  The communication unit 225 is a communication interface unit having an antenna, for example, and performs wireless communication with each of the plurality of storage battery packs 210. Specifically, the communication unit 225 transmits information to each of the plurality of storage battery packs 210 and receives information from each of the plurality of storage battery packs 210 by wireless communication. The communication unit 225 corresponds to the communication unit 123 of the first embodiment.

  Each of the plurality of storage battery packs 210 has the circuit shown in FIG. Further, as shown in the example of FIG. 5, each of the plurality of storage battery packs 210 is connected in series or in parallel to another storage battery pack. In the example of FIG. 5, four storage battery packs are connected in series in each of the three rows of storage battery pack groups connected in parallel. Here, among the plurality of storage battery packs 210, a plurality of storage battery packs connected in series constitute one group. That is, in the example of FIG. 5, three groups are connected in parallel.

  The processing and control operations performed by the charging / discharging device 220 are mainly performed by the control unit 224. The processing and control operations performed by each of the plurality of storage battery packs 210 are mainly performed by the control unit 217.

  6 is a diagram showing a plurality of storage battery packs 210 shown in FIG. An identification number is assigned to each of the plurality of storage battery packs 210 as identification information for identifying the storage battery pack. Each of the plurality of storage battery packs 210 holds its own identification number in a storage unit (not shown). Each of the plurality of storage battery packs 210 transmits information including its own identification number to the charging / discharging device 220, so that the charging / discharging device 220 can specify the storage battery pack that is the transmission source of the information.

  However, it is difficult for the charging / discharging device 220 to specify the connection relationship of the plurality of storage battery packs 210 based only on the identification information.

  Therefore, the charging / discharging device 220 energizes the plurality of storage battery packs 210 by charging / discharging the plurality of storage battery packs 210. Then, the charging / discharging device 220 opens the switch 213 of one of the plurality of storage battery packs 210 while the plurality of storage battery packs 210 are energized. It is assumed that the storage battery pack affected by opening the switch 213 of one storage battery pack is electrically connected in series to the one storage battery pack having the switch 213 opened.

  Here, the identification number is used as the identification information for identifying each of the plurality of storage battery packs 210, but the identification information is not limited to the identification number.

  FIG. 7 is a diagram showing a first state of the plurality of storage battery packs 210 shown in FIG. In this example, the switch 213 of the storage battery pack whose identification number is 1 is opened while the plurality of storage battery packs 210 are energized.

  When the switch 213 of the storage battery pack whose identification number is 1 is opened, the state of the storage battery pack whose identification number is 3, 6 or 8 varies. Specifically, the current value measured by the sensor 216 of the storage battery pack with the identification number 1 is 0, and the current value measured by the sensor 216 of the storage battery pack with the identification number 3, 6, or 8 is 0.

  Therefore, in this example, the charging / discharging device 220 determines that four storage battery packs each having an identification number of 1, 3, 6, or 8 among the plurality of storage battery packs 210 are connected in series.

  More specifically, the communication unit 225 of the charge / discharge device 220 receives the current value measured by the sensor 216 from each of the plurality of storage battery packs 210. Based on the current value received by the communication unit 225, the control unit 224 of the charging / discharging device 220 selects a storage battery pack whose current value varies to 0 when the switch 213 of the storage battery pack whose identification number is 1 is opened. Identify. In this example, the storage battery pack whose identification number is 3, 6 or 8 is a storage battery pack whose current value fluctuates to 0.

  Therefore, the control unit 224 of the charging / discharging device 220 specifies that three storage battery packs each having an identification number of 3, 6, or 8 are connected in series to the storage battery pack having an identification number of 1.

  Or each of the some storage battery pack 210 may judge whether an electric current value fluctuates according to switching of the switch 213 of one storage battery pack. And the communication part 219 of the other storage battery pack from which a current value fluctuates according to switching of the switch 213 of one storage battery pack may transmit the identification number corresponding to itself to the charging / discharging device 220.

  Thereby, the communication part 225 of the charging / discharging apparatus 220 can receive an identification number from the other storage battery pack from which an electric current value fluctuates. And the control part 224 of the charging / discharging apparatus 220 can specify the other storage battery pack from which an electric current value fluctuates according to switching of the switch 213 of one storage battery pack based on an identification number. And the control part 224 of the charging / discharging apparatus 220 can specify that these storage battery packs are mutually connected in series.

  Specifically, in this example, the current value measured by the sensor 216 of the storage battery pack whose identification number is 3 varies according to the switching of the switch 213 of the storage battery pack whose identification number is 1. Therefore, the communication unit 219 of the storage battery pack with the identification number 3 transmits 3 to the charging / discharging device 220 as the identification number corresponding to itself.

  And the communication part 225 of the charging / discharging apparatus 220 receives an identification number. And the control part 224 of the charging / discharging apparatus 220 is based on the identification number which the communication part 225 received as another storage battery pack from which an electric current value changes according to switching of the switch 213 of the storage battery pack whose identification number is 1. The storage battery pack whose identification number is 3 is specified.

  Alternatively, the communication unit 219 of another storage battery pack whose current value fluctuates in accordance with the switching of the switch 213 of one storage battery pack, the identification number corresponding to itself, and the identification of one storage battery pack in which the switch 213 is switched The number may be transmitted to the charging / discharging device 220.

  Specifically, in this example, the communication unit 219 of the storage battery pack whose identification number is 3 is 1 as the identification number of the storage battery pack to be switched from the charge / discharge device 220 or the storage battery pack whose identification number is 1. Receive. When the current value fluctuates, the communication unit 219 of the storage battery pack with the identification number 3 transmits 3 to the charging / discharging device 220 as the identification number corresponding to itself and 1 as the identification number of the storage battery pack to be switched. .

  And the communication part 225 of the charging / discharging apparatus 220 receives two identification numbers from the storage battery pack whose identification number is 3. FIG. Based on the two identification numbers received by the communication unit 225, the control unit 224 of the charging / discharging device 220 serves as another storage battery pack whose current value varies according to the switch 213 of the storage battery pack whose identification number is 1. The storage battery pack whose identification number is 3 can be specified.

  As described above, each of the plurality of storage battery packs 210 may transmit a current value. Alternatively, each of the plurality of storage battery packs 210 may transmit its own identification number or the like when the current value fluctuates. Thereby, the charging / discharging apparatus 220 can specify the connection relationship of the some storage battery pack 210 partially.

  FIG. 8 is a diagram showing a second state of the plurality of storage battery packs 210 shown in FIG. In this example, the switch 213 of the storage battery pack whose identification number is 2 is opened while the plurality of storage battery packs 210 are energized.

  Then, when the switch 213 of the storage battery pack with the identification number 2 is opened, the state of the storage battery pack with the identification number 5, 10, or 11 varies. Specifically, the current value measured by the sensor 216 of the storage battery pack with the identification number 2 is 0, and the current value measured by the sensor 216 of the storage battery pack with the identification number 5, 10, or 11 is 0.

  Therefore, in this example, the charging / discharging device 220 determines that four storage battery packs each having an identification number of 2, 5, 10, or 11 among the plurality of storage battery packs 210 are connected in series.

  Specific operations of the charging / discharging device 220 and the plurality of storage battery packs 210 in the example of FIG. 8 are the same as in the example of FIG.

  FIG. 9 is a diagram showing a third state of the plurality of storage battery packs 210 shown in FIG. In this example, the switch 213 of the storage battery pack whose identification number is 4 is opened while the plurality of storage battery packs 210 are energized.

  Then, when the switch 213 of the storage battery pack whose identification number is 4 is opened, the state of the storage battery pack whose identification number is 7, 9 or 12 varies. Specifically, the current value measured by the sensor 216 of the storage battery pack whose identification number is 4 is 0, and the current value measured by the sensor 216 of the storage battery pack whose identification number is 7, 9 or 12 is 0.

  Therefore, in this example, the charging / discharging device 220 determines that four storage battery packs each having an identification number of 4, 7, 9 or 12 among the plurality of storage battery packs 210 are connected in series with each other.

  Specific operations of the charging / discharging device 220 and the plurality of storage battery packs 210 in the example of FIG. 9 are the same as in the example of FIG. In addition, it may be predetermined based on the structure of the charging / discharging device 220 that the three battery pack groups are connected in parallel. In this case, the charging / discharging device 220 can determine that the remaining four storage battery packs are connected to each other in series based on the example of FIGS. Therefore, in this case, the charging / discharging device 220 can omit the operation corresponding to the example of FIG.

  FIG. 10 is a diagram showing a connection relationship between the plurality of storage battery packs 210 shown in FIG. The charging / discharging device 220 identifies the connection relationship of the plurality of storage battery packs 210 as shown in FIG. 10 based on the respective states shown in FIGS. 7, 8 and 9.

  That is, the charging / discharging device 220 determines that four storage battery packs each having an identification number of 1, 3, 6 or 8 are connected in series based on the state of FIG. Further, the charging / discharging device 220 determines that four storage battery packs each having an identification number of 2, 5, 10 or 11 are connected in series based on the state of FIG. Further, the charging / discharging device 220 determines that the four storage battery packs having the identification numbers of 4, 7, 9, or 12 are connected in series based on the state of FIG.

  And the charging / discharging apparatus 220 judges that the three storage battery pack groups each comprised by four storage battery packs are connected in parallel.

  The connection relationship of the plurality of storage battery packs 210 may be displayed on the display unit 228 of the external communication terminal 226. The communication terminal 226 is, for example, a personal computer, a mobile terminal, a mobile phone, a smartphone, or the like. The display unit 228 is a screen of a personal computer, a mobile terminal, a mobile phone, a smartphone, or the like, for example.

  More specifically, for example, the control unit 224 of the charging / discharging device 220 specifies the connection relationship of the plurality of storage battery packs 210. And the control part 224 transmits the array information which shows the connection relation of the some storage battery pack 210 to the communication terminal 226 by radio | wireless communication via the communication part 225. FIG. The communication terminal 226 displays the arrangement information on the display unit 228. Thereby, the control part 224 of the charging / discharging apparatus 220 can display arrangement | sequence information on the display part 228 of the communication terminal 226 via the communication part 225 grade | etc.,.

  Moreover, the control part 224 of the charging / discharging apparatus 220 may display arrangement | sequence information on the display part (not shown) of the charging / discharging apparatus 220. FIG. The control unit 224 may output the array information to other devices.

  The array information is information indicating the connection relationship of the plurality of storage battery packs 210. For example, the storage battery pack having the identification number 3 is connected in series to the storage battery pack having the identification number 1. . The storage battery pack whose identification number is 3 is a storage battery pack whose current value fluctuates in accordance with switching of the switch 213 of the storage battery pack whose identification number is 1.

  Further, the control unit 224 of the charging / discharging device 220 may output a warning based on a state of charge (SOC) corresponding to each of the plurality of storage battery packs electrically connected in series to each other. Good. The state of charge corresponding to each storage battery pack also corresponds to the secondary battery 214. The control unit 224 of the charging / discharging device 220 may display a warning on the display unit 228 of the communication terminal 226 via the communication unit 225 when outputting the warning.

  For example, when a plurality of storage battery packs connected in series with each other include storage battery packs having a charge state of 100%, the charging / discharging device 220 causes the storage battery packs to be It cannot be charged further. On the other hand, when a plurality of storage battery packs connected in series include storage battery packs having a charge state of 0%, the current for discharging stops, so that the charging / discharging device 220 causes these storage battery packs to Further discharge cannot be performed.

  Therefore, it is better that the plurality of charging states corresponding to the plurality of storage battery packs connected in series are equal. Therefore, for example, each communication unit 219 of the plurality of storage battery packs 210 transmits the charging state to the charging / discharging device 220. And the communication part 225 of the charging / discharging apparatus 220 receives each charge condition of the some storage battery pack 210. FIG.

  For example, when the value indicating the difference between the charged state of the storage battery pack with the identification number 1 and the charged state of the storage battery pack with the identification number 3 is not within a predetermined range, the control unit 224 of the charge / discharge device 220 is , Output a warning. The warning may include at least one of the two identification numbers. Further, the control unit 224 outputs a warning when a value indicating a difference between the maximum charge state and the minimum charge state is not within a predetermined range among the plurality of charge states corresponding to the plurality of series storage battery packs. May be.

  Thereby, the power storage system 200 can prompt the user to rearrange the plurality of storage battery packs 210 so that charging and discharging are performed efficiently.

  FIG. 11 is a flowchart showing an operation of power storage system 200 shown in FIG. The power storage system 200 performs the operation shown in FIG. 11 in charging / discharging the plurality of storage battery packs 210.

  First, the control part 224 of the charging / discharging apparatus 220 confirms the arrangement | sequence corresponding to the connection relation of the some storage battery pack 210 (S201). Specific operation will be described later. Next, the power storage system 200 performs charging / discharging of the plurality of storage battery packs 210 (S202). That is, when the charging / discharging unit 223 of the charging / discharging device 220 starts charging / discharging, the control unit 224 of the charging / discharging device 220 confirms the arrangement.

  In addition, the control part 224 of the charging / discharging apparatus 220 may confirm an arrangement | sequence at the timing when either of the some storage battery pack 210 was mounted | worn, or any of the some storage battery pack 210 was removed. Thereby, the control part 224 of the charging / discharging apparatus 220 can confirm the changed arrangement | sequence, when an arrangement | sequence is changed. The attachment or removal is detected by the sensor 222 of the charging / discharging device 220.

  The control unit 224 of the charge / discharge device 220 may check the arrangement at another timing. For example, the control unit 224 of the charge / discharge device 220 may check the arrangement at predetermined time intervals. The control unit 224 of the charge / discharge device 220 may confirm the arrangement at the plurality of timings described above.

  FIG. 12 is a flowchart showing the sequence confirmation processing (S201) in the operation shown in FIG. The controller 224 of the charging / discharging device 220 performs the operation shown in FIG. 12 in order to confirm the arrangement. In addition, the control part 224 of the charging / discharging apparatus 220 closes each switch 213 of the some storage battery pack 210 via the communication part 225 in advance, and supplies with electricity to the some storage battery pack 210 via the charging / discharging part 223.

  During energization of the plurality of storage battery packs 210, first, the control unit 224 of the charging / discharging device 220 opens the switch 213 of one storage battery pack among the plurality of storage battery packs 210 (S211). Next, the control unit 224 confirms one or more storage battery packs having a current value of 0 among the plurality of storage battery packs 210 (S212). Next, the control unit 224 groups one or more storage battery packs having a current value of 0 among the plurality of storage battery packs 210 (S213).

  That is, the control unit 224 includes one or more storage battery packs whose current values have changed to 0 in one group. The one or more storage battery packs whose current values have changed to 0 include a storage battery pack in which the switch 213 is opened.

  Next, the control unit 224 of the charging / discharging device 220 determines whether or not one or more storage battery packs that are not grouped exist among the plurality of storage battery packs 210 (S214). When one or more storage battery packs that are not grouped exist (Yes in S214), the control unit 224 opens the switch 213 of one storage battery pack among the one or more storage battery packs that are not grouped (S215). . That is, the switch 213 of the storage battery pack whose current value has not changed is opened.

  When one or more storage battery packs that are not grouped do not exist (No in S214), the control unit 224 of the charging / discharging device 220 ends the confirmation of the arrangement. That is, the control unit 224 repeats the above processing until all the storage battery packs among the plurality of storage battery packs 210 are grouped.

  The control unit 224 of the charging / discharging device 220 can divide the plurality of storage battery packs 210 into a plurality of groups based on the above operation. And the control part 224 of the charging / discharging apparatus 220 can judge that the some storage battery pack contained in one group is mutually connected in series electrically.

  The power storage system 200 according to the present embodiment can specify the electrical connection relationship of the plurality of storage battery packs 210 using wireless communication based on the above configuration and operation. Therefore, power storage system 200 according to the present embodiment can appropriately control charging / discharging of a plurality of storage battery packs 210.

(Embodiment 3)
The basic operation of the power storage system in the present embodiment is the same as that of power storage system 200 in the second embodiment. In the power storage system in the present embodiment, an abnormality control operation is added.

  FIG. 13 is a configuration diagram of a power storage system in the present embodiment. The power storage system 300 shown in FIG. 13 includes a plurality of storage battery packs 210 and a charge / discharge device 320. The charging / discharging device 320 includes a charging / discharging unit 223, a control unit 324, and a communication unit 225.

  The power storage system 300, the plurality of storage battery packs 210, the charging / discharging device 320, the charging / discharging unit 223, the control unit 324, and the communication unit 225 of the present embodiment are the same as the power storage system 200 of the second embodiment, and the plurality of storage battery packs 210. The charging / discharging device 220, the charging / discharging unit 223, the control unit 224, and the communication unit 225 are the same constituent elements.

  In the present embodiment, as in the second embodiment, the connection relationship of the plurality of storage battery packs 210 is specified by the control unit 324. The specified connection relationship may be stored in a storage unit (not shown) of the charge / discharge device 320.

  In the present embodiment, control unit 324 of charging / discharging device 320 includes abnormality determination unit 329. Abnormality determination unit 329 determines whether each of the plurality of storage battery packs 210 is in an abnormal state.

  For example, the communication unit 225 receives abnormality information indicating an abnormality from a storage battery pack that is in an abnormal state among the plurality of storage battery packs 210. Abnormality determination unit 329 determines whether each of the plurality of storage battery packs 210 is in an abnormal state based on the abnormality information. Specifically, abnormality determination unit 329 determines that the storage battery pack that transmitted the abnormality information is in an abnormal state.

  Storage battery pack abnormalities include overcharge and temperature abnormalities. Communication unit 225 receives a current value, a voltage value, a temperature, and the like from each of the plurality of storage battery packs 210. When these pieces of information are not in a normal range, that is, when the communication unit 225 receives abnormality information, the abnormality determination unit 329 determines that the storage battery pack that has transmitted the abnormality information is in an abnormal state. The abnormality determination unit 329 may determine that a storage battery pack whose product life has expired or a storage battery pack that is not communicable is also in an abnormal state.

  In the example of FIG. 13, the abnormality determination unit 329 determines that the storage battery pack whose identification number is 3 is in an abnormal state. In this case, the control unit 324 opens the respective switches 213 of the four storage battery packs whose identification numbers are 1, 3, 6 or 8. That is, in this case, the control unit 324 is connected not only to the switch 213 of the storage battery pack that is determined to be in an abnormal state, but also to a storage battery pack that is electrically connected in series to the storage battery pack that is determined to be in an abnormal state. The switch 213 is opened.

  A storage battery pack determined to be in an abnormal state may not operate normally. Therefore, control unit 324 may not be able to open switch 213 of the storage battery pack that is determined to be in an abnormal state. Therefore, the control unit 324 reliably establishes the storage battery pack determined to be in an abnormal state by opening the switch 213 of the storage battery pack electrically connected in series to the storage battery pack determined to be in an abnormal state. Can be electrically disconnected.

  In addition, the storage battery pack electrically connected in series with the storage battery pack in an abnormal state may open its own switch 213.

  Specifically, in the example of FIG. 13, the communication unit 219 of the storage battery pack whose identification number is 3 may transmit abnormality information to the storage battery pack whose identification number is 1. In this case, the communication unit 219 of the storage battery pack whose identification number is 1 receives the abnormality information transmitted from the storage battery pack whose identification number is 3. And the control part 217 of the storage battery pack whose identification number is 1 opens the switch 213 of the storage battery pack corresponding to itself based on the abnormality information received from the storage battery pack whose identification number is 3.

  Thereby, the some storage battery pack 210 can avoid performing charging / discharging with respect to the storage battery pack which is in an abnormal state irrespective of control from the charging / discharging apparatus 320. FIG.

  In the present embodiment, the control unit 324 includes the abnormality determination unit 329, but the abnormality determination unit 329 may be a component independent of the control unit 324. Abnormality determination unit 329 may be included in each of the plurality of storage battery packs 210.

  For example, when the abnormality determination unit 329 is included in each of the plurality of storage battery packs 210, the abnormality determination unit 329 determines whether another storage battery pack connected in series to the storage battery pack corresponding to itself is abnormal. May be. And in a storage battery pack provided with the abnormality judgment part 329 judged that other storage battery packs are abnormal, the control part 217 may open the switch 213.

  FIG. 14 is a flowchart showing the operation of the power storage system 300 shown in FIG. FIG. 14 particularly shows the operation of abnormality control.

  First, the abnormality determination unit 329 determines whether each of the plurality of storage battery packs 210 is in an abnormal state (S301). Next, the control part 324 opens the switch 213 of the storage battery pack determined to be in an abnormal state among the plurality of storage battery packs 210. Furthermore, the control part 324 opens the switch 213 of the storage battery pack connected in series to the storage battery pack determined to be in an abnormal state among the plurality of storage battery packs 210 (S302).

  The abnormality control shown in FIG. 14 may be performed immediately after the arrangement confirmation or may be performed immediately before the charge / discharge. Moreover, abnormality control may be performed at the timing of mounting or removing any of the plurality of storage battery packs 210. Further, the abnormality control may be performed constantly or at predetermined time intervals. The opened switch 213 may be closed again when the storage battery pack is recovered from the abnormal state or when the plurality of storage battery packs 210 are rearranged.

  Power storage system 300 according to the present embodiment can reliably electrically disconnect a storage battery pack that is in an abnormal state based on the above configuration and operation. Therefore, the power storage system 300 can improve safety and can continue to use the storage battery pack that is in a normal state.

  In each of the above embodiments, each component may be configured by dedicated hardware or may be realized by executing a software program suitable for each component. Each component may be realized by a program execution unit such as a CPU or a processor reading and executing a software program recorded on a recording medium such as a hard disk or a semiconductor memory. Here, the software that realizes the power storage system of each of the above embodiments is the following program.

  That is, this program is a method for controlling a power storage system in a computer, and the power storage system performs charging / discharging that is at least one of a plurality of storage battery packs and charging and discharging of the plurality of storage battery packs. Each of the plurality of storage battery packs includes a secondary battery, a switch connected in series to the secondary battery in the power path for charging and discharging, and wireless communication with the charging / discharging device. A first communication unit that performs charging and discharging, and a charging and discharging unit that performs charging and discharging, and a second communication unit that performs wireless communication with the plurality of storage battery packs. An energization step for energizing the plurality of storage battery packs by charging / discharging the charging / discharging unit; and during energization of the plurality of storage battery packs, using wireless communication, (i) The first switch that is the switch of the first storage battery pack among the plurality of storage battery packs is opened, (ii) subsequently, the first switch is closed, and (iii) subsequently, among the plurality of storage battery packs, the And opening a second switch, which is a switch of a second storage battery pack different from the first storage battery pack, and (iv) subsequently executing a control method of the power storage system including a control step of closing the second switch.

  Each component of the power storage system may be a circuit. These circuits may constitute one circuit as a whole, or may be separate circuits. Each of these circuits may be a general-purpose circuit or a dedicated circuit.

  As mentioned above, although the electrical storage system which concerns on one or several aspects was demonstrated based on embodiment, this invention is not limited to this embodiment. Unless it deviates from the gist of the present invention, various modifications conceived by those skilled in the art have been made in this embodiment, and forms constructed by combining components in different embodiments are also within the scope of one or more aspects. May be included.

  For example, in each of the above embodiments, a process executed by a specific processing unit may be executed by another processing unit instead of the specific processing unit. Further, the order of the plurality of processes may be changed, and the plurality of processes may be executed in parallel.

  The power storage system according to one embodiment of the present invention can be used for a power storage system for controlling electrical energy for residential use, commercial use, or industrial use, and can be applied to a backup power supply system, a portable power supply system, or the like. It is.

100, 200, 300 Power storage system 110a, 110b, 110c Storage battery pack 111a, 111b, 111c, 214 Secondary battery 112a, 112b, 112c, 213 Switch 113a, 113b, 113c, 123, 219, 225 Communication unit 120, 220, 320 Charging / discharging device 121, 223 Charging / discharging unit 122, 217, 224, 324 Control unit 210 Multiple storage battery packs 211, 221 Connection unit 212 Positive terminal 215, 216, 222 Sensor 218 Negative terminal 226 Communication terminal 228 Display unit 329 Abnormality determination unit

Claims (24)

A plurality of storage battery packs;
A charging / discharging device that performs charging / discharging which is at least one of charging and discharging of the plurality of storage battery packs,
Each of the plurality of storage battery packs
A secondary battery,
In the power path for charging and discharging, a switch connected in series to the secondary battery,
A first communication unit that performs wireless communication with the charge / discharge device,
The charging / discharging device
A charge / discharge unit for performing the charge / discharge;
A second communication unit that performs wireless communication with the plurality of storage battery packs;
When the charging / discharging unit charges / discharges the plurality of storage battery packs, (i) the plurality of storage battery packs via the second communication unit in order to specify the connection relationship of the plurality of storage battery packs. A first switch that is the switch of the first storage battery pack is opened, (ii) subsequently, the first switch is closed, and (iii), among the plurality of storage battery packs, the first storage battery pack and And (iv) a control unit that closes the second switch, and opens a second switch that is the switch of the different second storage battery pack. A plurality of storage battery packs;
A charging / discharging device that performs charging / discharging which is at least one of charging and discharging of the plurality of storage battery packs,
Each of the plurality of storage battery packs
A secondary battery,
In the power path for charging and discharging, a switch connected in series to the secondary battery,
A first communication unit that performs wireless communication with the charge / discharge device,
The charging / discharging device
A charge / discharge unit for performing the charge / discharge;
A second communication unit that performs wireless communication with the plurality of storage battery packs;
When charging / discharging the plurality of storage battery packs by the charge / discharge unit, via the second communication unit, (i) the first switch of the first storage battery pack among the plurality of storage battery packs. (Ii) Subsequently, the first switch is closed. (Iii) Next, among the plurality of storage battery packs, the second storage battery pack is different from the first storage battery pack. And (iv) a controller that closes the second switch, and (iv)
The first communication unit has a current value of the power path in a storage battery pack including the first communication unit according to switching of the switch of one of the first storage battery pack and the second storage battery pack. When it fluctuates, the 1st discernment information which shows the storage battery pack provided with the 1st communications department is transmitted to the charging / discharging device.
A charge reservoir system. A plurality of storage battery packs;
A charging / discharging device that performs charging / discharging which is at least one of charging and discharging of the plurality of storage battery packs,
Each of the plurality of storage battery packs
A secondary battery,
In the power path for charging and discharging, a switch connected in series to the secondary battery,
A first communication unit that performs wireless communication with the charge / discharge device,
The charging / discharging device
A charge / discharge unit for performing the charge / discharge;
A second communication unit that performs wireless communication with the plurality of storage battery packs;
When charging / discharging the plurality of storage battery packs by the charge / discharge unit, via the second communication unit, (i) the first switch of the first storage battery pack among the plurality of storage battery packs. (Ii) Subsequently, the first switch is closed. (Iii) Next, among the plurality of storage battery packs, the second storage battery pack is different from the first storage battery pack. And (iv) a controller that closes the second switch, and (iv)
The control unit includes a storage battery pack in which a current value of the power path varies in series with the one storage battery pack according to switching of the switch of one storage battery pack of the first storage battery pack and the second storage battery pack. Outputs the array information shown as a connected battery pack
A charge reservoir system. A plurality of storage battery packs;
A charging / discharging device that performs charging / discharging which is at least one of charging and discharging of the plurality of storage battery packs,
Each of the plurality of storage battery packs
A secondary battery,
In the power path for charging and discharging, a switch connected in series to the secondary battery,
A first communication unit that performs wireless communication with the charge / discharge device,
The charging / discharging device
A charge / discharge unit for performing the charge / discharge;
A second communication unit that performs wireless communication with the plurality of storage battery packs;
When charging / discharging the plurality of storage battery packs by the charge / discharge unit, via the second communication unit, (i) the first switch of the first storage battery pack among the plurality of storage battery packs. (Ii) Subsequently, the first switch is closed. (Iii) Next, among the plurality of storage battery packs, the second storage battery pack is different from the first storage battery pack. And (iv) a controller that closes the second switch, and (iv)
The charge / discharge device further includes an abnormality determination unit that determines whether each of the plurality of storage battery packs is in an abnormal state,
The control unit is further configured to, among the plurality of storage battery packs, each of one or more storage battery packs of the plurality of storage battery packs according to the storage battery pack determined to be in an abnormal state by the abnormality determination unit. Open the switch
The control unit is an abnormal state in which the storage battery pack in which the current value of the power path fluctuates in accordance with switching of the switch of one of the first storage battery pack and the second storage battery pack is abnormal in the abnormality determination unit. If it is determined that the current value of the power path fluctuates in response to switching of the switch of the one storage battery pack, the switch of another storage battery pack is opened.
A charge reservoir system. A plurality of storage battery packs;
A charging / discharging device that performs charging / discharging which is at least one of charging and discharging of the plurality of storage battery packs,
Each of the plurality of storage battery packs
A secondary battery,
In the power path for charging and discharging, a switch connected in series to the secondary battery,
A first communication unit that performs wireless communication with the charge / discharge device,
The charging / discharging device
A charge / discharge unit for performing the charge / discharge;
A second communication unit that performs wireless communication with the plurality of storage battery packs;
When charging / discharging the plurality of storage battery packs by the charge / discharge unit, via the second communication unit, (i) the first switch of the first storage battery pack among the plurality of storage battery packs. (Ii) Subsequently, the first switch is closed. (Iii) Next, among the plurality of storage battery packs, the second storage battery pack is different from the first storage battery pack. And (iv) a controller that closes the second switch, and (iv)
Each of the plurality of storage battery packs further includes an individual control unit that controls switching of the switch,
The first communication unit receives abnormality information from a storage battery pack that is in an abnormal state among the plurality of storage battery packs,
In the individual control unit, a storage battery pack including the individual control unit changes a current value of the power path according to switching of the switch of one of the first storage battery pack and the second storage battery pack. Another storage battery pack that is a storage battery pack, and wherein the first communication unit of the storage battery pack including the individual control unit has a current value of the power path that fluctuates according to switching of the switch of the one storage battery pack When the abnormality information is received from the battery pack, the switch of the storage battery pack provided with the individual control unit is opened.
A charge reservoir system. The power storage system according to any one of claims 1 to 5, wherein the second storage battery pack is different from a storage battery pack in which a current value of the power path varies according to switching of the first switch. The power storage system according to any one of claims 1 to 6 , wherein each of the plurality of storage battery packs includes a current sensor that measures a current value of the power path. The first communication unit, the power storage system according to any one of claims 1 to 7 for transmitting the current value of the power path to the rechargeable device. The first communication unit is
From the charging / discharging device, the second identification information indicating the storage battery pack that has switched the switch is received,
The power storage system according to claim 2 , wherein when transmitting the first identification information, the first identification information and the second identification information are transmitted. The first communication unit is
From the storage battery pack that switches the switch, the second identification information indicating the storage battery pack that switches the switch is received,
The power storage system according to claim 2 , wherein when transmitting the first identification information, the first identification information and the second identification information are transmitted. The second communication unit communicates with an external communication terminal including a display unit,
The power storage system according to claim 3 , wherein the control unit outputs the arrangement information by displaying the arrangement information on the display unit of the external communication terminal via the second communication unit. The charge / discharge device further includes an abnormality determination unit that determines whether each of the plurality of storage battery packs is in an abnormal state,
The control unit is further configured to, among the plurality of storage battery packs, each of one or more storage battery packs of the plurality of storage battery packs according to the storage battery pack determined to be in an abnormal state by the abnormality determination unit. The power storage system according to any one of claims 1 to 3, 5 and 9 to 11 . The power storage system according to claim 4 or 12 , wherein the control unit opens the switch of the storage battery pack that is determined to be in an abnormal state by the abnormality determination unit. The second communication unit receives abnormality information from a storage battery pack that is in an abnormal state among the plurality of storage battery packs,
The abnormality determination part, based on the second said anomaly information communication unit receives any one of claims 4, 12 and 13 each of the plurality of battery packs is determined whether an abnormal state The electricity storage system according to item. The power storage system according to any one of claims 1 to 14, wherein the charge / discharge device further includes a connection unit that detachably connects each of the plurality of storage battery packs. The charging / discharging device further includes a mounting detection unit that detects mounting of each of the plurality of storage battery packs,
The control unit, when the attachment of at least one of the plurality of storage battery packs is detected, energizes the plurality of storage battery packs, and opens the first switch during energization of the plurality of storage battery packs, The power storage system according to claim 15, wherein the first switch is closed, the second switch is opened, and the second switch is closed. When the charging / discharging unit starts the charging / discharging, the control unit energizes the plurality of storage battery packs and opens the first switch while the plurality of storage battery packs are energized, and the first switch 17 is closed, the second switch is opened, and the second switch is closed. The power storage system according to claim 1. The control unit has a predetermined range of values indicating a difference between two charge states of two storage battery packs in which a current value of the power path varies according to switching of one of the first switch and the second switch. The power storage system according to any one of claims 1 to 17, wherein if it is not within, a warning is output. The second communication unit communicates with an external communication terminal including a display unit,
The power storage system according to claim 18, wherein the control unit outputs the warning by displaying the warning on the display unit of the external communication terminal via the second communication unit. A method for controlling a power storage system, comprising:
The power storage system includes:
A plurality of storage battery packs;
A charging / discharging device that performs charging / discharging which is at least one of charging and discharging of the plurality of storage battery packs,
Each of the plurality of storage battery packs
A secondary battery,
In the power path for charging and discharging, a switch connected in series to the secondary battery,
A first communication unit that performs wireless communication with the charge / discharge device,
The charging / discharging device
A charge / discharge unit for performing the charge / discharge;
A second communication unit that performs wireless communication with the plurality of storage battery packs,
The power storage system control method includes:
When the charging / discharging unit is charging / discharging the plurality of storage battery packs , wireless communication is used to identify the connection relationship of the plurality of storage battery packs , and (i) the first of the plurality of storage battery packs. A first switch that is the switch of one storage battery pack is opened, (ii) subsequently, the first switch is closed, and (iii), among the plurality of storage battery packs, the first storage battery pack is different from the first storage battery pack. A control method for a power storage system, comprising: a step of opening a second switch which is the switch of the two storage battery pack, and (iv) subsequently closing the second switch.   A method for controlling a power storage system, comprising:
  The power storage system includes:
  A plurality of storage battery packs;
  A charging / discharging device that performs charging / discharging which is at least one of charging and discharging of the plurality of storage battery packs,
  Each of the plurality of storage battery packs
  A secondary battery,
  In the power path for charging and discharging, a switch connected in series to the secondary battery,
  A first communication unit that performs wireless communication with the charge / discharge device,
  The charging / discharging device
  A charge / discharge unit for performing the charge / discharge;
  A second communication unit that performs wireless communication with the plurality of storage battery packs,
  The power storage system control method includes:
  When charging / discharging the plurality of storage battery packs by the charge / discharge unit, wireless communication is used to open (i) a first switch that is the switch of the first storage battery pack among the plurality of storage battery packs. (Ii) Subsequently, the first switch is closed, and (iii) Subsequently, among the plurality of storage battery packs, a second switch that is a switch of a second storage battery pack different from the first storage battery pack is opened. (Iv) Subsequently, a control step of closing the second switch;
  When the current value of the electric power path in the storage battery pack including the first communication unit fluctuates according to switching of the switch of one of the first storage battery pack and the second storage battery pack, the first A communication unit including a transmission step of transmitting first identification information indicating the storage battery pack including the first communication unit to the charge / discharge device.
  A method for controlling a power storage system.   A method for controlling a power storage system, comprising:
  The power storage system includes:
  A plurality of storage battery packs;
  A charging / discharging device that performs charging / discharging which is at least one of charging and discharging of the plurality of storage battery packs,
  Each of the plurality of storage battery packs
  A secondary battery,
  In the power path for charging and discharging, a switch connected in series to the secondary battery,
  A first communication unit that performs wireless communication with the charge / discharge device,
  The charging / discharging device
  A charge / discharge unit for performing the charge / discharge;
  A second communication unit that performs wireless communication with the plurality of storage battery packs,
  The power storage system control method includes:
  When charging / discharging the plurality of storage battery packs by the charge / discharge unit, wireless communication is used to open (i) a first switch that is the switch of the first storage battery pack among the plurality of storage battery packs. (Ii) Subsequently, the first switch is closed, and (iii) Subsequently, among the plurality of storage battery packs, a second switch that is a switch of a second storage battery pack different from the first storage battery pack is opened. (Iv) Subsequently, a control step of closing the second switch;
  A storage battery pack in which a storage battery pack in which a current value of the power path varies according to switching of the switch of one of the first storage battery pack and the second storage battery pack is connected in series to the one storage battery pack Output step for outputting the array information indicated as
  A method for controlling a power storage system.   A method for controlling a power storage system, comprising:
  The power storage system includes:
  A plurality of storage battery packs;
  A charging / discharging device that performs charging / discharging which is at least one of charging and discharging of the plurality of storage battery packs,
  Each of the plurality of storage battery packs
  A secondary battery,
  In the power path for charging and discharging, a switch connected in series to the secondary battery,
  A first communication unit that performs wireless communication with the charge / discharge device,
  The charging / discharging device
  A charge / discharge unit for performing the charge / discharge;
  A second communication unit that performs wireless communication with the plurality of storage battery packs,
  The power storage system control method includes:
  When charging / discharging the plurality of storage battery packs by the charge / discharge unit, wireless communication is used to open (i) a first switch that is the switch of the first storage battery pack among the plurality of storage battery packs. (Ii) Subsequently, the first switch is closed, and (iii) Subsequently, among the plurality of storage battery packs, a second switch that is a switch of a second storage battery pack different from the first storage battery pack is opened. (Iv) Subsequently, a control step of closing the second switch;
  An abnormality determination step of determining whether each of the plurality of storage battery packs is in an abnormal state,
  In the control step, each of the one or more storage battery packs among the plurality of storage battery packs is further selected according to the storage battery pack determined to be in an abnormal state in the abnormality determination step among the plurality of storage battery packs. Open the switch
  In the control step, a storage battery pack in which a current value of the power path varies according to switching of the switch of one of the first storage battery pack and the second storage battery pack is abnormal in the abnormality determination step. If it is determined that the current value of the power path fluctuates in response to switching of the switch of the one storage battery pack, the switch of another storage battery pack is opened.
  A method for controlling a power storage system.   A method for controlling a power storage system, comprising:
  The power storage system includes:
  A plurality of storage battery packs;
  A charging / discharging device that performs charging / discharging which is at least one of charging and discharging of the plurality of storage battery packs,
  Each of the plurality of storage battery packs
  A secondary battery,
  In the power path for charging and discharging, a switch connected in series to the secondary battery,
  A first communication unit that performs wireless communication with the charge / discharge device,
  The charging / discharging device
  A charge / discharge unit for performing the charge / discharge;
  A second communication unit that performs wireless communication with the plurality of storage battery packs,
  The power storage system control method includes:
  When charging / discharging the plurality of storage battery packs by the charge / discharge unit, wireless communication is used to open (i) a first switch that is the switch of the first storage battery pack among the plurality of storage battery packs. (Ii) Subsequently, the first switch is closed, and (iii) Subsequently, among the plurality of storage battery packs, a second switch that is a switch of a second storage battery pack different from the first storage battery pack is opened. (Iv) subsequently, a control step of closing the second switch,
  Each of the plurality of storage battery packs further includes an individual control unit that controls switching of the switch,
  The method for controlling the power storage system further includes:
  The first communication unit receives abnormality information from a storage battery pack that is in an abnormal state among the plurality of storage battery packs;
  The storage battery pack including the individual control unit is a storage battery pack in which a current value of the power path varies according to switching of the switch of one of the first storage battery pack and the second storage battery pack, and The first communication unit of the storage battery pack including the individual control unit receives the abnormality information from another storage battery pack in which the current value of the power path varies according to switching of the switch of the one storage battery pack. In that case, the individual control unit includes an individual control step of opening the switch of the storage battery pack including the individual control unit.
  A method for controlling a power storage system.

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