Power storage system, power conditioner, and storage battery unit

Abstract

A power storage system includes a battery cell and a power conditioner. The battery unit has a battery, a measurement unit, and a connection switch. The measuring unit detects the voltage of the storage battery. The connection switch is arranged between the storage battery and the measuring part. The power conditioner adjusts the power. The power regulator applies a first voltage to the battery unit while the connection switch is in an off state. When it is determined that the battery unit is reversely connected on the basis of the comparison between the measured voltage and the first voltage, the disconnection state of the connection switch is maintained.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of Japanese Patent Application No. 2023-124951 filed in Japan on July 31, 2023, and the entire disclosure of that prior application is incorporated herein by reference. Technical Field

[0003] The present disclosure relates to a power storage system, a power conditioner, and a battery unit. Background Art

[0004] A battery unit including a plurality of secondary battery cells is connected to a power conditioner for orthogonal conversion and voltage regulation between the battery unit and a load device or other power source. When the battery unit and the power conditioner are installed by the installer, the polarity is sometimes mistaken and the connection is reversed. If the connection is reversed, a large current will flow, so the power conditioner may be damaged, the battery unit may be degraded, etc. A power supply device that protects the circuit even when it is reversely connected is proposed (see patent document 1).

[0005] Patent Document 1: Japanese Patent Application Publication No. 2013-232995 Summary of the invention

[0006] In order to solve the above-mentioned problems, a power storage system according to a first aspect includes:

[0007] at least one storage battery unit including a storage battery, a measuring unit for detecting a voltage of the storage battery, and a connection switch provided between the storage battery and the measuring unit; and

[0008] a power conditioner for adjusting power input to and power output from the at least one battery cell,

[0009] When the connection switch is in an open state, a first voltage is applied from the power conditioner to the battery cell, and when it is determined that the battery cell is reversely connected based on a comparison between a measured voltage detected by the measuring unit and the first voltage, the connection switch is maintained in the open state.

[0010] The power conditioner of the second aspect is a power conditioner connected to at least one battery unit, and has:

[0011] The first control unit, while applying a first voltage to the at least one battery cell, determines whether the battery cell is reversely connected based on a comparison between a measured voltage obtained from the battery cell and the first voltage, and sends a first instruction to the battery cell to set a connection switch of the battery cell to an on state if it is determined that the battery cell is not reversely connected.

[0012] The battery unit of the third aspect comprises:

[0013] Batteries;

[0014] A measuring unit for detecting the voltage of the battery;

[0015] a connection switch, disposed between the battery and the measuring unit; and

[0016] The second control unit, when the connection switch is in the disconnected state and the measuring unit detects a voltage other than zero, determines whether it is reversely connected based on a comparison between the measured voltage detected by the measuring unit and a first voltage, and maintains the disconnected state of the connection switch if it is determined to be reversely connected. The first voltage is a voltage represented by voltage information obtained from a power conditioner connected to the battery via the connection switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 : is a structural diagram showing a schematic structure of a power storage system according to the present embodiment.

[0018] Figure 2 It is used to illustrate Figure 1 Flowchart of reverse connection prevention processing performed by the control unit of the power conditioner.

[0019] Description of Reference Numerals

[0020] 10 Power storage system

[0021] 11 Battery unit

[0022] 11a First battery unit

[0023] 11b First battery unit

[0024] 12 Power Regulator

[0025] 13 Connect the switch

[0026] 14 Measurement Department

[0027] 15. Battery

[0028] 16 Control unit (second control unit)

[0029] 17 First positive terminal

[0030] 18 First negative terminal

[0031] 19 Voltage conversion unit

[0032] 20 Capacitor

[0033] 21 Control unit (first control unit)

[0034] 22. Orthogonal transformation unit

[0035] 23 Interconnection relays

[0036] 24 Ministry of Communications

[0037] 25 Second positive terminal

[0038] 26 Second negative terminal

[0039] 27 AC terminal DETAILED DESCRIPTION

[0040] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In the components shown in the following drawings, the same components are denoted by the same reference numerals.

[0041] like Figure 1 As shown, a power storage system 10 according to an embodiment of the present disclosure includes at least one battery cell 11 and a power conditioner 12. The at least one battery cell 11 may be a single battery cell 11 or a plurality of battery cells 11. Figure 1 The illustrated power storage system 10 is described as including two battery cells 11, namely a first battery cell 11a and a second battery cell 11b. In the following description, the first battery cell 11a and the second battery cell 11b will be collectively referred to as a battery cell 11. A plurality of battery cells 11 may be connected in parallel.

[0042] As described later, in a state where the connection switch 13 of the battery cell 11 is disconnected, the first voltage is applied from the power conditioner 12 to the battery cell 11. For application of the first voltage, the measured voltage detected by the measuring unit 14 of the battery cell 11 is compared with the first voltage. In a case where it is determined that the battery cell 11 is reversely connected based on the comparison between the measured voltage and the first voltage, the disconnected state of the connection switch 13 is maintained. The determination of whether the battery cell 11 is reversely connected based on the comparison between the measured voltage and the first voltage can be performed by the power conditioner 12, for example.

[0043] The storage battery unit 11 includes a storage battery 15 , a measuring unit 14 , a connection switch 13 , and a control unit (second control unit) 16 .

[0044] The battery 15 may include a single or multiple secondary battery cells. In a structure having multiple secondary battery cells, the multiple secondary battery cells may be connected in series or in parallel. The positive pole of the battery 15 may be directly or indirectly connected to the positive terminal 17 of the battery cell 11. Specifically, the positive pole of the battery 15 is connected to the positive terminal 17 of the battery cell 11 via the connecting switch 13. The negative pole of the battery 15 may be directly or indirectly connected to the negative terminal 18 of the battery cell 11. Specifically, the negative pole of the battery 15 is connected to the negative terminal 18 of the battery cell 11.

[0045] The measuring unit 14 detects the voltage of the battery 15. In order to detect the voltage of the battery 15, the positive terminal of the measuring unit 14 can be connected to the first positive terminal 17. The first positive terminal 17 is the positive terminal of the battery cell 11. The negative terminal of the measuring unit 14 can be connected to the first negative terminal 18. The first negative terminal 18 is the negative terminal of the battery cell 11. As described later, since a connection switch 13 is provided between the measuring unit 14 and the battery 15, the measuring unit 14 can detect the voltage of the first positive terminal 17 and the first negative terminal 18 when the connection switch 13 is in the disconnected state. The measuring unit 14 is, for example, a voltmeter. The lower limit value of the measurement range of the measuring unit 14 can be 0V or a negative value. The lower limit value can be a voltage value below the voltage value after the polarity of the first voltage described later is reversed.

[0046] The connection switch 13 is provided between the storage battery 15 and the measuring unit 14. The connection switch 13 may be provided, for example, on the positive side of the storage battery 15. The connection switch 13 may cut off the current in the off state. The connection switch 13 may conduct the current in the on state. The connection switch 13 may be, for example, an electromagnetic relay or a FET.

[0047] The control unit 16 is configured to include at least one processor, at least one dedicated circuit, or a combination thereof. The processor is a general-purpose processor such as a CPU (Central Processing Unit) or a GPU (Graphics Processing Unit) or a dedicated processor dedicated to a specific process. The dedicated circuit may be, for example, an FPGA (Field-Programmable Gate Array) or an ASIC (Application Specific Integrated Circuit). The control unit 16 controls the operation of the battery unit 11.

[0048] The control unit 16 can, for example, obtain the measured voltage of the voltage as information from the measuring unit 14. The control unit 16 can give the measured voltage of the voltage as information to the power conditioner 12. In response to the giving of the measured voltage, the control unit 16 can switch the connection switch 13 to the on state when obtaining the first instruction described later from the power conditioner 12. In addition, the control unit 16 can maintain the connection switch 13 in the off state until the first instruction is obtained.

[0049] The power conditioner 12 adjusts the power input to at least one battery cell 11 and the power output from at least one battery cell 11. The power conditioner 12 can be set, for example, between the battery cell 11 and other power sources and load devices. Other power sources can supply DC power like a solar power generation device or a fuel cell device, or they can supply AC power like a system or a generator. The power conditioner 12 can perform orthogonal conversion as power adjustment between a load device using AC power and other power sources supplying AC power and the battery cell 11. The power conditioner 12 can adjust the voltage between the orthogonal conversion unit 22 described later and the battery cell 11 as power adjustment.

[0050] The power conditioner 12 is configured to include a voltage conversion unit 19 and a capacitor 20. The power conditioner 12 may also be configured to include a control unit (first control unit) 21, an orthogonal conversion unit 22, an interconnection relay 23, and a communication unit 24.

[0051] The voltage conversion unit 19 can adjust the voltage of the power supplied to the battery cell 11. Specifically, the voltage conversion unit 19 adjusts the voltage of the output terminal connected to the second positive terminal 25 and the second negative terminal 26, respectively, to the voltage set by the control unit 21. The second positive terminal 25 is the positive terminal of the battery cell 11 connected to the power conditioner 12. The second negative terminal 26 is the negative terminal of the battery cell 11 connected to the power conditioner 12. In addition, the voltage conversion unit 19 can also adjust the voltage of the power supplied to the orthogonal conversion unit 22. The voltage conversion unit 19 is, for example, a bidirectional DC / DC converter.

[0052] The capacitor 20 is connected in parallel with the voltage conversion unit 19. More specifically, the capacitor 20 is connected to the output terminal of the voltage conversion unit 19 connected to the second positive terminal 25 and the second negative terminal 26. The capacitor 20 may be built in the voltage conversion unit 19. The capacitor 20 is, for example, a smoothing capacitor.

[0053] The orthogonal conversion unit 22 can convert AC power into DC power and convert DC power into AC power. The orthogonal conversion unit 22 can be connected to the voltage conversion unit 19 on the DC side. In addition, the orthogonal conversion unit 22 can be connected to the AC terminal 27 on the AC side. The orthogonal conversion unit 22 is, for example, a bidirectional DC / AC converter.

[0054] The interconnection relay 23 may be provided between each of the orthogonal conversion unit 22 and the AC terminal 27. The interconnection relay 23 may cut off the current in an off state. The connection switch 13 may conduct the current in an on state.

[0055] The communication unit 24 can communicate with the battery unit 11 by wire or wirelessly. The communication unit 24 can give information and instructions to the battery unit 11 based on the control of the control unit 21. The communication unit 24 can give the information obtained from the battery unit 11 to the control unit 21. The information obtained can be the voltage value measured by the measuring unit 14, or the voltage value recorded in the second control unit 16 can be read.

[0056] The control unit 21 is configured to include at least one processor, at least one dedicated circuit, or a combination thereof. The processor is a general-purpose processor such as a CPU, a GPU, or a dedicated processor dedicated to a specific process. The dedicated circuit may be, for example, an FPGA, an ASIC, etc. The control unit 21 controls the operation of the power conditioner 12.

[0057] The control unit 21 may switch the interconnection relay 23 to the on state when charging the storage battery unit 11. Furthermore, the control unit 21 may control the orthogonal conversion unit 22 to convert the AC power supplied from the system connected to the AC terminal 27 into DC power. Furthermore, the control unit 21 may control the voltage conversion unit 19 to adjust the voltage of the DC power output from the orthogonal conversion unit 22 to a voltage value for charging the storage battery unit 11. In addition, in a configuration in which another power source connected to the power conditioner 12 supplies DC power, the orthogonal conversion unit 22 may not be operated, but the voltage conversion unit 19 may be operated.

[0058] The control unit 21 may switch the interconnection relay 23 to the on state when discharging from the storage battery unit 11. Furthermore, the control unit 21 may control the voltage conversion unit 19 to adjust the voltage of the DC power output from the storage battery unit 11 to a controllable voltage value of the orthogonal conversion unit 22. Furthermore, the control unit 21 may control the orthogonal conversion unit 22 to convert the DC power output from the voltage conversion unit 19 into AC power.

[0059] The control unit 21 can perform reverse connection prevention processing when the battery unit 11 is electrically connected to the power conditioner 12. The control unit 21 can start the reverse connection prevention processing when directly or indirectly recognizing the connection of the battery unit 11. As a method of use, it can be stipulated that the power conditioner 12 switches the power supply to on when it is electrically connected to the battery unit 11 and other power sources. When the power supply of the power conditioner 12 is switched on, the control unit 21 can recognize the connection with the battery unit 11. Alternatively, the control unit 21 can recognize the connection with the battery unit 11 through the operation input of the input device of the power conditioner 12 by the installer.

[0060] In the reverse connection prevention process, when the connection switch 13 is in the disconnected state, the control unit 21 can use the power supplied from other power sources to the voltage conversion unit 19 via the orthogonal conversion unit 22 to control the voltage conversion unit 19 so that the voltage of the power supplied to the battery cell 11 becomes the first voltage. The control unit 21 applies the first voltage to the battery cell 11 connected to the power conditioner 12 by adjusting to the first voltage. The first voltage can be lower than the lower limit value of the use voltage specified for the battery cell 11 assumed to be connected. The lower limit value of the use voltage is the voltage value that the control unit 16 determines the discharge termination in order to protect the battery from over-discharge. For example, if the nominal voltage of the battery 15 is 200V, the lower limit value of the use voltage is about 162V. The first voltage can be set to a lower voltage such as 10V so that the inrush current is difficult to flow to the battery cell 11 side. In addition, as a condition for starting to adjust to the first voltage, the control unit 21 can confirm that the connection switch 13 of the battery cell 11 is not in the on state. In addition, as a condition for starting adjustment to the first voltage, the control unit 21 may confirm that there is no voltage between the second positive electrode terminal 25 and the second negative electrode terminal 26 .

[0061] The control unit 21 obtains the measured voltage as information from the battery cell 11 in a state where the first voltage is applied. As described above, the measured voltage is the voltage between the first positive terminal 17 and the first negative terminal 18 detected by the measuring unit 14. The control unit 21 determines whether the battery cell 11 is reversely connected to the power conditioner 12 based on the comparison between the measured voltage and the first voltage. Reverse connection means that the polarity of the terminal of the battery cell 11 is reversed and connected to the power conditioner 12.

[0062] Specifically, if the difference between the measured voltage and the first voltage is not less than the discrimination threshold, in other words, if the difference between the measured voltage and the first voltage exceeds the discrimination threshold, the control unit 21 can discriminate as reverse connection. The discrimination threshold may be a value determined in order to determine the range in which the measured voltage and the first voltage are considered to be the same. If the difference between the measured voltage and the first voltage is less than the discrimination threshold, the control unit 21 can discriminate as not reversely connected. The discrimination threshold is a value determined by adding the measurement error of the measuring unit 14 and the like to the first voltage set at a lower limit value less than the above-mentioned use voltage. For example, in a structure in which the first voltage is set to 10V, the discrimination threshold is 12V on the premise that the measurement errors of the measuring unit 14 and the control unit 21 are 10% respectively.

[0063] If it is determined that the connection is not reversed, the control unit 21 may control the communication unit 24 to send a first command to the battery unit 11. The first command is a command to switch the connection switch 13 of the battery unit 11 to the on state.

[0064] If it is determined that the connection is not reverse, the control unit 21 may switch the connection switch 13 of the battery cell 11 to the on state after applying a second voltage closer to the operating voltage of the battery cell 11 than the first voltage to the capacitor 20. Specifically, if it is determined that the connection is not reverse, the control unit 21 uses the power supplied to the voltage conversion unit 19 from another power source via the orthogonal conversion unit 22 to control the voltage conversion unit 19 so that the voltage of the power supplied to the storage cell 11 becomes the second voltage. The second voltage is a value between the first voltage and the operating voltage of the battery cell 11 and closer to the first voltage. In addition, the control unit 21 sends a first instruction to the battery cell 11 after adjusting to the second voltage.

[0065] If it is determined that there is no reverse connection, the control unit 21 can control the communication unit 24 to send a first instruction to the battery cell 11. If it is determined that there is a reverse connection, the control unit 21 can control the communication unit 24 to send a second instruction to the battery cell 11. The second instruction is an instruction to maintain the connection switch 13 of the battery cell 11 in a disconnected state. There is a danger that the control unit 16 switches the connection switch 13 to an on state through other condition determinations or manual operation of the user. On the other hand, by receiving the second instruction, it is possible to prevent the connection switch 13 from switching to an on state based on other instructions. In addition, in a structure designed from a safety point of view to maintain the connection switch 13 in a disconnected state before the battery cell 11 receives the first instruction from the control unit 21, the sending of the second instruction can also be omitted.

[0066] If it is determined to be a reverse connection, the control unit 21 can report an abnormal state. The control unit 21 can, for example, send an instruction to report an abnormal state to an electronic device including an output device such as a display and a speaker connected to the power conditioner 12 in a wired or wireless manner. The electronic device is, for example, the power conditioner 12, a remote controller of the power conditioner 12, a HEMS (Home Energy Management System), an external server, etc.

[0067] The control unit 21 may compare the measured voltage obtained from the new battery cell 11 with the first voltage again after a predetermined waiting time has passed since the reverse connection was determined. The control unit 21 may again determine whether the battery cell 11 is reversely connected based on the comparison between the measured voltage and the first voltage.

[0068] In a state where a plurality of storage battery units 11 are connected in parallel to the power conditioner 12, the control unit 21 can determine whether each storage battery unit 11 is reversely connected. Specifically, the control unit 21 can determine whether each of the plurality of storage battery units 11 is reversely connected based on a comparison between the measured voltage measured by the measuring unit 14 and the first voltage. The control unit 21 can send a first instruction to the storage battery unit 11 to switch the connection switch 13 of the storage battery unit 11 that is determined not to be reversely connected among the plurality of storage battery units 11 to the on state.

[0069] Next, use Figure 2 The flowchart of FIG. 1 illustrates the reverse connection prevention process executed by the control unit 21 in the present embodiment. For example, when it is recognized that the storage battery unit 11 is connected to the power conditioner 12, the reverse connection prevention process is started.

[0070] In step S100, the control unit 21 controls the voltage conversion unit 19 to adjust the voltage of the electric power supplied to the storage battery unit 11 to the first voltage. After the voltage is adjusted, the process proceeds to step S101.

[0071] In step S101, the control unit 21 determines whether the measured voltage is acquired as information from the storage battery unit 11. If not, the process returns to step S101. If acquired, the process proceeds to step S102.

[0072] In step S102, the control unit 21 determines whether the difference between the measured voltage confirmed and acquired in step S101 and the first voltage is less than the determination threshold. If the difference is less than the determination threshold, the process proceeds to step S103. If the difference is not less than the determination threshold, the process proceeds to step S105.

[0073] In step S103, the control unit 21 controls the voltage conversion unit 19 to adjust the voltage of the electric power supplied to the storage battery unit 11 to the second voltage. After the voltage is adjusted, the process proceeds to step S104.

[0074] In step S104, the control unit 21 controls the communication unit 24 to transmit the first command to the storage battery unit 11. After the transmission, the reverse connection prevention process ends.

[0075] In step S105, the control section 21 controls the communication section 24 to transmit the second command to the storage battery unit 11. After the transmission, the process proceeds to step S106.

[0076] In step S106, the control section 21 controls the communication section 24 to transmit an instruction to report an abnormal state to the electronic device including the output device. After the transmission, the reverse connection prevention process ends.

[0077] The power storage system 10 of the present embodiment having the above-described structure includes: at least one storage battery unit 11, which includes a storage battery 15, a measuring unit 14 for detecting the voltage of the storage battery 15, and a connection switch 13 provided between the storage battery 15 and the measuring unit 14; and a power conditioner 12, which adjusts the power input to the at least one storage battery unit 11 and the power output from the at least one storage battery unit 11, applies a first voltage from the power conditioner 12 to the storage battery unit 11 when the connection switch 13 is in an off state, and maintains the off state of the connection switch 13 when it is determined that the storage battery unit 11 is reversely connected based on the comparison between the measured voltage detected by the measuring unit 14 and the first voltage. With such a structure, the power storage system 10 can determine the reverse connection before applying the voltage of the storage battery 15 from the storage battery unit 11 to the power conditioner 12. Therefore, the power storage system 10 can reduce the possibility of damage to the power conditioner 12 due to the reverse connection.

[0078] In addition, in the power storage system 10, the power conditioner 12 includes a control unit 21, and the control unit 21 gives a first instruction to switch the connection switch 13 to the on state to the battery unit 11 when the difference between the measured voltage and the first voltage is less than the determination threshold. With such a structure, the power storage system 10 can use the battery unit 11 through the power conditioner 12 when it is normally connected.

[0079] In addition, in the power storage system 10, after determining that the battery cell 11 is reversely connected, the power storage system 10 again determines whether the battery cell 11 is reversely connected based on the comparison between the measured voltage after the predetermined standby time and the first voltage. With such a structure, when the operator who has been notified of the abnormal state reconnects the battery cell 11 correctly, the power storage system 10 can automatically connect the battery 15 to the power conditioner 12. In particular, automatic connection is effective in the structure of the power storage system 10 in which a plurality of battery cells 11 are connected. For example, even if the charging or discharging of the first battery cell 11a is not forcibly interrupted, the power storage system 10 can switch the connection switch 13 to the disconnected state and perform the determination of whether the second battery cell 11b is reversely connected when the charging or discharging of the first battery cell 11a is stopped. In addition, when the second battery cell 11b is not reversely connected, the power storage system 10 can also give the first instruction to switch the connection switch 13 to the on state to all the battery cells 11.

[0080] In addition, in the power storage system 10, the first voltage is lower than the lower limit value of the operating voltage specified for the battery unit 11. With such a structure, the power storage system 10 can improve the accuracy of reverse connection determination because the first voltage used to determine whether it is reversely connected is different from the voltage that may be detected for the battery 15. In addition, the power storage system 10 uses a voltage lower than the voltage of the battery unit 11, so the risk of electric shock can be further reduced.

[0081] In addition, the power storage system 10 reports an abnormal state when the difference between the measured voltage and the first voltage exceeds the determination threshold. With such a configuration, the power storage system 10 can make the operator who installs the power storage system 10 recognize the reverse connection and urge the operator to reconnect normally.

[0082] In addition, in the power storage system 10, the connection switch 13 of the battery cell 11 that is determined to be not reversely connected based on the comparison between the measured voltage detected by the measuring unit 14 and the first voltage is switched to the on state. With such a configuration, the power storage system 10 can be operated only by the normal battery cell 11 that is not reversely connected, and the power storage system 10 can be used by using other normally connected battery cells 11 until the reverse connection state of the reversely connected battery cell 11 is repaired.

[0083] In addition, in the power storage system 10, the power conditioner 12 includes: a voltage conversion unit 19 that adjusts the voltage of the power supplied to the battery cell 11; and a capacitor 20 that is connected in parallel with the voltage conversion unit 19. When the difference between the measured voltage and the first voltage is less than the determination threshold, after applying a second voltage closer to the use voltage of the battery cell 11 than the first voltage to the capacitor 20, the connection switch 13 is switched to the on state. With such a structure, the power storage system 10 can reduce the difference in voltage between the battery cell 11 and the power conditioner 12 before switching the connection switch 13 to the on state. Therefore, since the power storage system 10 is turned on after reducing the difference in voltage between the two, the current value of the inrush current between the battery cell 11 and the power conditioner 12 can be reduced. Therefore, the power storage system 10 does not require a circuit for preventing inrush current in the power conditioner 12, so it is possible to simplify the structure of the power conditioner 12 and reduce the number of components.

[0084] In one embodiment, (1) a power storage system includes:

[0085] at least one storage battery unit including a storage battery, a measuring unit for detecting a voltage of the storage battery, and a connection switch provided between the storage battery and the measuring unit; and

[0086] a power conditioner for adjusting power input to and power output from the at least one battery cell,

[0087] When the connection switch is in an open state, a first voltage is applied from the power conditioner to the battery cell, and when it is determined that the battery cell is reversely connected based on a comparison between a measured voltage detected by the measuring unit and the first voltage, the connection switch is maintained in the open state.

[0088] (2) In the power storage system of (1) above,

[0089] The power conditioner includes a first control unit configured to provide the battery unit with a first instruction to switch the connection switch to an on state when the difference between the measured voltage and the first voltage is equal to or smaller than a determination threshold.

[0090] (3) In the power storage system of (1) above,

[0091] The battery unit further includes a second control unit configured to switch the connection switch to an on state when a difference between the measured voltage and the first voltage is equal to or smaller than a determination threshold.

[0092] (4) In the power storage system of any one of (1) to (3) above,

[0093] After determining that the battery cell is connected in reverse, whether the battery cell is connected in reverse is determined again based on the comparison between the measured voltage and the first voltage after a predetermined waiting time has passed.

[0094] (5) In the power storage system of any one of (1) to (4) above,

[0095] The first voltage is lower than a lower limit value of a usage voltage specified for the battery cell.

[0096] (6) In the power storage system of any one of (1) to (5) above,

[0097] When the difference between the measured voltage and the first voltage exceeds a determination threshold, an abnormal state is reported.

[0098] (7) In the power storage system of any one of (1) to (6) above,

[0099] The at least one battery cell comprises a plurality of battery cells,

[0100] The connection switch of the battery cell determined as not being reversely connected among the plurality of battery cells based on a comparison between the measured voltage detected by the measuring unit and the first voltage is switched to an on state.

[0101] (8) In the power storage system of any one of (2) or (3) above,

[0102] The power conditioner includes: a voltage conversion unit that adjusts the voltage of the power supplied to the battery unit; and a capacitor that is connected in parallel with the voltage conversion unit.

[0103] When the difference between the measured voltage and the first voltage is equal to or smaller than the determination threshold, the connection switch is switched to the on state after a voltage closer to the operating voltage of the battery cell than the first voltage is applied to the capacitor.

[0104] In one embodiment, (9) a power conditioner is a power conditioner connected to at least one battery unit, having:

[0105] The first control unit, while applying a first voltage to the at least one battery cell, determines whether the battery cell is reversely connected based on a comparison between a measured voltage obtained from the battery cell and the first voltage, and sends a first instruction to the battery cell to set a connection switch of the battery cell to an on state if it is determined that the battery cell is not reversely connected.

[0106] In one embodiment, (10) a battery cell comprises:

[0107] Batteries;

[0108] A measuring unit, detecting the voltage of the battery;

[0109] a connection switch, disposed between the battery and the measuring unit; and

[0110] The second control unit, when the connection switch is in the disconnected state and the measuring unit detects a voltage other than zero, determines whether it is reversely connected based on a comparison between the measured voltage detected by the measuring unit and a first voltage, and maintains the disconnected state of the connection switch if it is determined to be reversely connected. The first voltage is a voltage represented by voltage information obtained from a power conditioner connected to the battery via the connection switch.

[0111] The above describes an implementation of the power storage system 10, but as an implementation of the present disclosure, in addition to a method or program for implementing the device, an implementation of a storage medium (for example, a CD, a magneto-optical disk, a CD-ROM, a CD-R, a CD-RW, a magnetic tape, a hard disk, or a memory card, etc.) on which a program is recorded can also be adopted.

[0112] In addition, the installation method of the program is not limited to application programs such as target codes compiled by a compiler and program codes executed by an interpreter, but may also be a program module loaded into an operating system. Furthermore, the program may be configured to implement all processing only in the CPU on the control substrate, or may not be configured to implement all processing only in the CPU on the control substrate. The program may also be configured to implement part or all of it by other processing units installed in an expansion board or expansion unit attached to the substrate as needed.

[0113] The drawings for explaining the embodiments of the present disclosure are schematic drawings, and the dimensional ratios and the like in the drawings do not necessarily correspond to the actual ones.

[0114] Although the embodiments of the present disclosure have been described with reference to the drawings and embodiments, it should be noted that those skilled in the art may make various deformations or modifications based on the present disclosure. Therefore, it should be noted that these deformations or modifications are included in the scope of the present disclosure. For example, the functions included in each structural part etc. can be reconfigured in a logically non-contradictory manner, and multiple structural parts etc. can be combined into one or divided.

[0115] For example, in the embodiment disclosed above, the control unit 21 of the power conditioner 12 performs reverse connection prevention processing. However, the control unit 16 of the storage battery unit 11 may also perform reverse connection prevention processing. Specifically, the control unit 16 may compare the measured voltage with the first voltage when the measuring unit 14 detects a measured voltage other than zero when the connection switch 13 is in the disconnected state. When the first positive terminal 17 and the first negative terminal 18 are connected to an electrical device such as the power conditioner 12, the measuring unit 14 detects a voltage other than zero. Therefore, based on the detection of a voltage other than zero, the reverse connection prevention processing may be started in the storage battery unit 11. The control unit 16 may obtain the first voltage as voltage information from the power conditioner 12 connected to the storage battery 15 via the connection switch 13. Alternatively, the control unit 16 may obtain the first voltage as voltage information in advance and store it in a memory. The acquisition of voltage information may be performed at the time of shipment, or may be performed by input operation of an input device of the power conditioner 12 or communication from an external device. The control unit 16 may determine whether it is reversely connected based on the comparison between the measured voltage and the first voltage. When the control unit 16 determines that the connection is reversed, the control unit 16 may maintain the OFF state of the connection switch 13. When the control unit 16 determines that the connection is not reversed, the control unit 16 may control the connection switch 13 to switch to the ON state.

[0116] All constituent elements and / or all steps of all methods or processes disclosed in the present disclosure can be combined in any combination except for the mutually exclusive combinations of these features. In addition, each feature recorded in the present disclosure can be replaced by an alternative feature used for the same, equivalent or similar purpose, unless explicitly denied. Therefore, unless explicitly denied, each feature disclosed is merely an example of a series of identical or equivalent features included.

[0117] In addition, the embodiments of the present disclosure are not limited to any specific structure of the above embodiments. The embodiments of the present disclosure can be extended to all novel features or combinations thereof described in the present disclosure, or to all novel methods or processing steps or combinations thereof described.

[0118] In the present disclosure, the descriptions of "first" and "second" etc. are identifiers for distinguishing the structure. In the present disclosure, the structures distinguished by the descriptions of "first" and "second" etc. can exchange the numbers in the structure. For example, the first voltage can exchange the identifiers "first" and "second" with the second voltage. The exchange of identifiers is performed simultaneously. The structure is also distinguished after the exchange of identifiers. The identifiers can be deleted. The structure from which the identifiers are deleted is distinguished by symbols. The description of identifiers such as "first" and "second" etc. in the present disclosure alone cannot be used to interpret the order of the structures or the basis for the existence of identifiers with small numbers.

Claims

1. A power storage system, wherein: have: at least one battery unit having a battery, a measuring unit for detecting a voltage of the battery, and a connection switch disposed between the battery and the measuring unit; as well as a power conditioner for adjusting power input to and power output from the at least one battery cell, When the connection switch is in an open state, a first voltage is applied from the power conditioner to the battery cell, and when it is determined that the battery cell is reversely connected based on a comparison between a measured voltage detected by the measuring unit and the first voltage, the connection switch is maintained in an open state.

2. The power storage system according to claim 1, wherein: The power conditioner includes a first control unit configured to provide the battery unit with a first instruction to switch the connection switch to an on state when the difference between the measured voltage and the first voltage is equal to or smaller than a determination threshold.

3. The power storage system according to claim 1, wherein: The battery unit further includes a second control unit configured to switch the connection switch to an on state when a difference between the measured voltage and the first voltage is equal to or smaller than a determination threshold.

4. The power storage system according to any one of claims 1 to 3, wherein: After determining that the battery cell is connected in reverse, it is determined again whether the battery cell is connected in reverse based on the comparison between the measured voltage and the first voltage after a predetermined waiting time has passed.

5. The power storage system according to any one of claims 1 to 4, wherein: The first voltage is lower than a lower limit value of a usage voltage specified for the battery cell.

6. The power storage system according to any one of claims 1 to 5, wherein: When the difference between the measured voltage and the first voltage exceeds a determination threshold, an abnormal state is reported.

7. The power storage system according to any one of claims 1 to 6, wherein: The at least one battery cell comprises a plurality of battery cells, The connection switch of the battery cell determined as not being reversely connected among the plurality of battery cells based on a comparison between the measured voltage detected by the measuring unit and the first voltage is switched to an on state.

8. The power storage system according to claim 2 or 3, wherein: The power conditioner includes: a voltage conversion unit that adjusts the voltage of the power supplied to the battery unit; and a capacitor that is connected in parallel with the voltage conversion unit. When the difference between the measured voltage and the first voltage is equal to or smaller than the determination threshold, the connection switch is switched to the on state after a voltage closer to the operating voltage of the battery cell than the first voltage is applied to the capacitor.

9. A power conditioner connected to at least one battery unit, having: The first control unit, while applying a first voltage to the at least one battery cell, determines whether the battery cell is reversely connected based on a comparison between a measured voltage obtained from the battery cell and the first voltage, and sends a first instruction to the battery cell to set a connection switch of the battery cell to an on state if it is determined that the battery cell is not reversely connected.

10. A battery cell, wherein: have: Batteries; A measuring unit, detecting the voltage of the battery; a connection switch, disposed between the battery and the measuring unit; and The second control unit, when the connection switch is in the disconnected state and the measuring unit detects a voltage other than zero, determines whether it is reversely connected based on a comparison between the measured voltage detected by the measuring unit and a first voltage, and maintains the disconnected state of the connection switch if it is determined to be reversely connected. The first voltage is a voltage represented by voltage information obtained from a power conditioner connected to the battery via the connection switch.

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