Power storage control system and power storage control method

Abstract

To evaluate the state of a charging / discharging line in which high voltage flows.SOLUTION: A power storage control system includes: a first voltage detection part that detects a first voltage from the voltages of charging / discharging lines 35a and 35b that charge or discharge power storage energy to battery modules 11-1 to 11-7 or from the battery modules 11-1 to 11-7; a second voltage detection part that detects a second voltage from the total of cell voltages of the battery modules; and an evaluation part that compares between the first voltage and the second voltage to evaluate the charging / discharging lines 35a and 35b.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a power storage control system and a power storage control method. [Background technology]

[0002] Power supply systems in which solar panels are installed on the roofs of houses and the electricity generated by the solar panels is used as household electricity are becoming widespread. As a power storage unit for use in such power supply systems, a configuration has been proposed in which a plurality of battery cells are connected in series to form a battery stack, enabling a desired voltage to be obtained (for example, Patent Document 1). For example, the voltage of a lithium-ion battery cell is about 2V to 4V. In contrast, the voltage of a household power supply is several hundred volts. In this case, several dozen battery cells are connected in series to ensure a voltage of several hundred volts for household use. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-156200 A Summary of the Invention [Problem to be solved by the invention]

[0004] The voltage generated by connecting multiple battery cells in series is several hundred volts, and high-voltage current flows through the charge / discharge lines that charge and discharge power from the power conditioner to the storage battery unit, or from the storage battery unit to the power conditioner. Problems due to aging and other factors are of concern in charge / discharge lines through which such high voltages flow.

[0005] In view of the above-mentioned problems, an object of the present invention is to provide an electricity storage control system and an electricity storage control method capable of evaluating the state of a charge / discharge line through which a high voltage flows. [Means for solving the problem]

[0006] A power storage control system according to one aspect of the present invention controls charging and discharging of a battery module that constitutes a storage battery used in a storage battery unit. Electricity storage The control system includes a first voltage detection unit that detects a first voltage from a voltage of a charge / discharge line that charges or discharges storage energy to or from the battery module, a second voltage detection unit that detects a second voltage from a total value of cell voltages of the battery module, and an evaluation unit that compares the first voltage with the second voltage to evaluate the charge / discharge line. The evaluation unit compares the first voltage with the second voltage, and when a voltage difference between the first voltage and the second voltage is greater than a predetermined value, evaluates that the charge / discharge line is deteriorated. do.

[0007] A power storage control method according to one aspect of the present invention controls charging and discharging of a battery module that constitutes a storage battery used in a storage battery unit. Electricity storage A control method, comprising: detecting a first voltage from a voltage of a charge / discharge line that charges or discharges storage energy to or from the battery module; and detecting a second voltage from a total value of cell voltages of the battery module. Have , comparing the first voltage with the second voltage, When the voltage difference between the first voltage and the second voltage is greater than a predetermined value, The charging and discharging line but deterioration As I was saying evaluate. Effect of the Invention

[0008] According to the present invention, the deterioration of the charge / discharge line can be evaluated by comparing the measured voltage of the charge / discharge line with the total value of the measured cell voltages. [Brief description of the drawings]

[0009] [Figure 1] 1 is a block diagram showing an overview of a power supply system according to the present invention; [Diagram 2] FIG. 1 is an explanatory diagram illustrating an overview of a storage battery unit used in a power supply system according to the present invention. [Diagram 3] 1 is an explanatory diagram illustrating an overview of a relay cable that connects a connector of a battery module and a connector of a control management module. [Figure 4]1 is an explanatory diagram illustrating an overview of a relay cable that connects a connector of a battery module and a connector of a control management module. [Diagram 5] FIG. 2 is an explanatory diagram of an example of a battery module. [Figure 6] FIG. 2 is a block diagram showing a configuration of a control management module. [Figure 7] FIG. 2 is a block diagram showing an overview of an AFE circuit element disposed on a BMS substrate. [Figure 8] FIG. 1 is an explanatory diagram when an AFE circuit element is arranged corresponding to a battery module. [Figure 9] FIG. 1 is an explanatory diagram of a power storage control system according to an embodiment of the present invention. [Figure 10] 2 is a flowchart used to explain the power storage control system according to an embodiment of the present invention. [Figure 11] FIG. 13 is a block diagram showing an outline of another configuration example of a power supply system according to the present invention. [Figure 12] FIG. 13 is a block diagram showing an outline of another configuration example of a power supply system according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. <Overall system> Fig. 1 is a block diagram showing an overview of a power supply system 10 according to the present invention. As shown in Fig. 1, the power supply system 10 according to the embodiment of the present invention includes a power conditioner 1, a solar panel 2, and a storage battery unit 3.

[0011] The power conditioner 1 performs processes such as conversion between DC and AC power, control of power supply voltage, and buying and selling electricity. That is, while commercial power supply 5 uses AC power, solar power generation and electricity storage use DC power. Also, the voltage of commercial power supply 5 differs from the voltage of the batteries used in solar panel 2 and storage battery unit 3. The power conditioner 1 converts between DC and AC power and controls the power supply voltage between the commercial power supply 5, solar panel 2, and storage battery unit 3. The power conditioner 1 then supplies power to a distribution board 6, which distributes the power to the outlets in each room.

[0012] The solar panel 2 can generate electricity during the daytime when the sun is out, but cannot generate electricity at night when the sun sets, and the amount of electricity generated is unstable. The storage battery unit 3 can be charged from the grid via the commercial power source 5 and power conditioner 1 during the day, and can also be charged via the solar panel 2 and power conditioner 1, and can also supplement the power supply via the power conditioner 1. The storage battery unit 3 can be charged from the grid via the commercial power source 5 and power conditioner 1 at night, and can also supplement the power supply via the power conditioner 1.

[0013] In addition, the power conditioner 1 performs processes such as purchasing and selling power, such as purchasing power from a commercial power source 5 when there is a power shortage, and selling power to the commercial power source 5 when there is surplus power from the solar panel 2.

[0014] An EV (Electric Vehicle) stand 4 can also be incorporated into the power supply system 10. The EV stand 4 can be used to charge an electric vehicle, as well as to store power using a battery installed in the electric vehicle. The EV stand 4 can also supplement the power supply via the power conditioner 1.

[0015] Fig. 2 is an explanatory diagram of an overview of the storage battery unit 3 used in the power supply system 10 according to the present invention. As shown in Fig. 2, the storage battery unit 3 is composed of, for example, seven battery modules 11-1 to 11-7 and a control management module 12. The battery modules 11-1 to 11-7 are provided with a battery stack made up of a plurality of battery cells. The battery modules 11-1 to 11-7 are also provided with connectors 13- to 13-7 and connectors 14-1 to 14-7, respectively.

[0016] The control management module 12 manages the charge / discharge states of the battery modules 11-1 to 11-7. The control management module 12 is provided with connectors 45- to 45-7 and connectors 56-1 to 56-7.

[0017] The connectors 13-1 to 13-7 of the battery modules 11-1 to 11-7 and the connectors 45-1 to 45-7 of the control management module 12 are connected by relay cables 60-1 to 60-7 as shown in Fig. 3. The connectors 14-1 to 14-7 of the battery modules 11-1 to 11-7 and the connectors 56-1 to 56-7 of the control management module 12 are connected by relay cables 70-1 to 70-7 as shown in Fig. 4.

[0018] FIG. 3 is an explanatory diagram illustrating an outline of relay cables 60 (60-1 to 60-7) that connect the connectors 13-1 to 13-7 of the battery modules 11-1 to 11-7 and the connectors 45-1 to 45-7 of the control management module 12. As shown in FIG.

[0019] 3, the relay cable 60 is made up of connectors 61 (61-1 to 61-n) on the battery modules 11-1 to 11-7 side, connectors 62 (62-1 to 62-n) on the control management module 12 side, and cables 63 (63-1 to 63-n) therebetween. The cables 63 (63-1 to 63-n) are two wires, one for a positive electrode and one for a negative electrode.

[0020] FIG. 4 is an explanatory diagram illustrating an outline of relay cables 70 (70-1 to 70-7) that connect the connectors 14-1 to 14-7 of the battery modules 11-1 to 11-7 and the connectors 56-1 to 56-7 of the control management module 12. As shown in FIG.

[0021] 4, the relay cables 70 (70-1 to 70-7) are made up of connectors 71 (71-1 to 71-7) on the battery modules 11-1 to 11-7 side, connectors 72 (72-1 to 72-7) on the control management module 12 side, and cables 73 (73-1 to 73-7) therebetween. The cables 73 (73-1 to 73-7) are made up of wiring whose number corresponds to the number of battery cells that make up the battery stack.

[0022] 5 is an explanatory diagram of an example of the battery modules 11 (11-1 to 11-7). Note that the battery modules 11-1 to 11-7 are all configured in the same manner.

[0023] As shown in FIG. 5, the battery module 11 (11-1 to 11-7) is provided with a battery stack consisting of battery cells 20-1, 20-2, ..., 20-n connected in series. For example, lithium iron phosphate ion batteries are used as the battery cells 20-1, 20-2, ..., 20-n. The lithium iron phosphate ion battery uses lithium iron phosphate as the positive electrode, and is characterized by its high safety as its crystal structure is not easily destroyed even if heat is generated inside the battery. The cell voltage of each battery cell 20-1, 20-2, ..., 20-n varies depending on the cell structure. In the case of a lithium ion battery, the cell voltage is 2V to 4V. In the case of a lithium iron phosphate ion battery, the cell voltage is, for example, about 3.3V.

[0024] The battery modules 11 (11-1 to 11-7) are provided with connectors 13 (13-1 to 13-7) and connectors 14 (14-1 to 14-7). The connectors 13 (13-1 to 13-7) are connectors for charging and discharging the battery modules 11. The connectors 14 (14-1 to 14-7) are connectors for monitoring the cell voltages of the battery cells 20-1, 20-2, ..., 20-n.

[0025] Fig. 6 is a block diagram showing the configuration of the control management module 12. As shown in Fig. 6, the control management module 12 is equipped with a terminal block 31, a breaker 33, an HV (High-Voltage) board 40, and a BMS (Battery Management System) board 50.

[0026] The terminal block 31 is a connector for connecting wiring from the power conditioner 1. The terminal block 31 is provided with a positive terminal 31a, a negative terminal 31b, and a ground terminal 31c. In this example, the ground terminal 31c is connected to the housing as a zero potential. Wires extending from the positive terminal 31a and the negative terminal 31b of the terminal block 31 form charge / discharge lines 35a and 35b. The breaker 33 is for protection when a large current flows.

[0027] The communication connector 32 is a connector for connecting a shielded wire for communication from the power conditioner 1. The communication connector 32 is connected to a communication connector 51 on the BMS board 50. Data from the power conditioner 1 is received via the communication connector 32 and sent to the microprocessor 54. In addition, data from the microprocessor 54 is sent to the power conditioner 1 via the communication connector 32.

[0028] The HV board 40 is a board for charging and discharging the battery modules 11-1 to 11-7. On the HV board 40, a relay 41, a current sensor 42, a communication connector 43, connectors 45-1 to 45-7, and a communication connector 46 are mounted.

[0029] The relay 41 serves as a switch for starting / stopping the operation of the storage battery unit 3. The current sensor 42 detects charging / discharging current to / from the battery modules 11-1 to 11-7. The communication connector 43 is connected to a communication connector 52 on the BMS board 50. The communication connector 43 transmits the detected current of the current sensor 42 to a microprocessor 54, for example.

[0030] The connectors 45-1 to 45-7 are terminals that connect to the connectors 13-1 to 13-7 on the battery modules 11-1 to 11-7 side, respectively. The connectors 13-1 to 13-7 on the battery modules 11-1 to 11-7 side are connectors for charging and discharging, and wiring from both ends of the battery cells 20-1, 20-2, ..., 20-n that make up the battery stack is led out from the connectors 13-1 to 13-7. The connectors 45-1 to 45-7 are connected in series to obtain a desired charging and discharging voltage.

[0031] The communication connector 46 is a terminal for detecting the voltage of the charge / discharge lines 35a and 35b.

[0032] The BMS board 50 is a board for monitoring and controlling the states of the battery modules 11-1 to 11-7. The BMS board 50 is mounted with communication connectors 51 and 52, an AFE (Analog Front End) 53, a microprocessor 54, a photocoupler 55, connectors 56-1 to 56-7, a communication connector 57, an A / D converter 58, and a photocoupler 59 which is an optical isolation element. The optical isolation element is an element such as a photocoupler or a digital isolator.

[0033] The communication connector 51 is connected to the communication connector 32, and transmits and receives data to and from the power conditioner 1. The communication connector 52 is connected to the communication connector 43, and transmits and receives data to and from the HV board 40.

[0034] AFE 53 detects the cell voltage of each of battery modules 11-1 to 11-7 and converts it into digital data.

[0035] The microprocessor 54 performs various controls based on data from the power conditioner 1, data from the HV board 40, data from the AFE 53, and the like.

[0036] The photocoupler 55 connects the AFE 53 and the microprocessor 54. Since a high voltage is applied to the AFE 53, the photocoupler 55 provides isolation between the AFE 53 and the microprocessor 54.

[0037] The connectors 56-1 to 56-7 are terminals that connect to the connectors 14-1 to 14-7 on the battery modules 11-1 to 11-7 side, respectively. The connectors 14 (14-1 to 14-7) are connectors for monitoring the cell voltages of the battery cells 20-1, 20-2, ..., 20-n. The connectors 56-1 to 56-7 transmit the cell voltages of the battery modules 11-1 to 11-7 to the BMS board 50 side, respectively.

[0038] The communication connector 57 is connected to the communication connector 46 of the HV board 40. The communication connector 57 is supplied with the voltage of the charge / discharge lines 35a and 35b.

[0039] The A / D converter 58 converts the voltage between the charge / discharge lines 35a and 35b of the HV board 40 into digital data, and transmits it to the microprocessor 54 via a photocoupler 59 for isolation.

[0040] Fig. 7 is a block diagram showing an outline of the AFE circuit element 530 arranged on the BMS board 50. In this embodiment, the function of the AFE 53 is realized by arranging the AFE circuit elements 530 as shown in Fig. 7 in the number corresponding to the battery modules 11-1 to 11-7. Note that the description here is limited to a part of the function of the AFE circuit element 530 that is necessary for explaining the present invention.

[0041] 7, terminals A1, A2, ..., Am (m is any integer) are measurement terminals for detecting the cell voltage of the battery stack. When detecting the cell voltage of the battery stack, the battery cells are connected in the order from terminal A1 to terminal Am, from the electrode with the highest potential to the electrode with the lowest potential.

[0042] The resistor Ra and the switch circuit Sa between the stages of the terminals A1, A2, ..., Am are for balancing the battery cells. That is, when the switch circuit Sa is turned on, both poles of the battery cells are connected via the resistor Ra, and the energy in the battery cells is consumed by Joule heat. This causes the energy of the battery cells with a large charge to be consumed, and the charge amount of each battery cell can be equalized.

[0043] The terminals D1 and D2 are terminals for inputting and outputting data. Data is input and output between the AFE 53 and the microprocessor 54 via the terminals D1 and D2.

[0044] FIG. 8 is an explanatory diagram when AFE circuit elements 530-1 to 530-7 are arranged corresponding to battery modules 11-1 to 11-7.

[0045] 5, battery modules 11-1 to 11-7 are provided with a battery stack consisting of battery cells 20-1, 20-2, ..., 20-n. Both ends and inter-stages of each battery cell 20-1, 20-2, ..., 20-n are connected to terminals A1, A2, ..., Am of AFE circuit elements 530-1 to 530-7, respectively. Furthermore, each AFE circuit element 530-1 to 530-7 is connected in series.

[0046] 8, the cell voltages of the battery cells constituting the battery stack of each of the battery modules 11-1 to 11-7 are detected by the AFE circuit elements 530-1 to 530-7. The cell voltages of the battery cells constituting the battery stack of each of the battery modules 11-1 to 11-7 are then converted into digital values ​​by the AFE circuit elements 530-1 to 530-7 and sent to the microprocessor 54 via the photocoupler 55.

[0047] <Embodiment> The power storage control system according to the embodiment of the present invention is used to determine deterioration of the charge / discharge lines 35a and 35b in the storage battery unit 3 configured as described above.

[0048] Fig. 9 is an explanatory diagram of a power storage control system according to an embodiment of the present invention. As shown in Fig. 9, in the power storage control system according to the embodiment of the present invention, the measured voltages of the charge / discharge lines 35a and 35b are sent from the HV board 30 to the BMS board 40 side via the communication connector 46 and the communication connector 57. This is for determining the deterioration of the charge / discharge lines 35a and 35b by detecting the voltages of the charge / discharge lines 35a and 35b. Note that it is preferable that the communication connector 46 is led out so that the voltage of the wiring of the charge / discharge lines 35a and 35b from the side farther from the battery modules 11-1 to 11-7 can be detected.

[0049] If there is no resistance component in the charge / discharge lines 35a and 35b, the measured voltage Vdet of the charge / discharge lines 35a and 35b becomes equal to the voltage of the battery modules 11-1 to 11-7 connected in series.

[0050] VdetV1+V2+…+V7 … (1)

[0051] However, when the charge / discharge lines 35a and 35b, the connectors 45-1 to 45-7, the connectors 60-1 to 60-7, and the connectors 13-1 to 13-7 deteriorate, resistance components Rda and Rdb are generated as shown in Fig. 9. As a result, the measured voltage Vdet of the charge / discharge lines 35a and 35b becomes as follows:

[0052] Vdet=VL=V1+V2+…+V7±Ve… (2)

[0053] Here, voltage Ve is a fluctuation component due to the voltage generated across resistance components Rda and Rdb. If the current flowing through charge / discharge lines 35a and 35b is I, the voltages generated across resistance components Rda and Rdb are (I×Ra) and (I×Rb). Since charge / discharge currents flow through charge / discharge lines 35a and 35b, connectors 45-1 to 45-7, connectors 60-1 to 60-7, and connectors 13-1 to 13-7, current I is large, and therefore voltage Ve, the fluctuation component due to resistance components Rda and Rdb, is large.

[0054] 8, the voltages V1 to V7 of each of the battery modules 11-1 to 11-7 are the sum of the cell voltages of the battery cells 20-1 to 20-n of each of the battery modules 11-1. That is, if the cell voltages of the battery cells 20-1 to 20-n of each of the battery modules 11-1 are Vcl_1 to Vcn_1, Vcl_2 to Vcn_2, ..., Vcl_7 to Vcn_7, the voltages V1 to V7 of each of the battery modules 11-1 to 11-7 are as follows:

[0055] V1 = Vc1_1 + Vc2_1 + … + Vcn_1 V2 = Vc1_2 + Vc2_2 + … + Vcn_2 … V7=Vc1_7+Vc2_7+…+Vcn_7 … (3)

[0056] The total value Vtotal of the measured cell voltages of the battery cells 20-1 to 20-n of the battery modules 11-1 to 11-7 is expressed as follows.

[0057] Vtotal=(Vc1_1+Vc2_1+…+Vcn_1)+Vc1_2+Vc2_2+…+Vcn_2)+…+(Vc1_7+Vc2_7+…+Vcn_7) =V1+V2+…+V7 … (4)

[0058] Since the current flowing through the path from battery modules 11-1 to 11-7 to AFE 53 is small, the voltage generated by the resistance component of the path can be ignored.

[0059] When the measured voltages Vdet at the charge / discharge lines 35a and 35b, the connectors 45-1 to 45-7, the connectors 60-1 to 60-7, and the connectors 13-1 to 13-7 shown in (2) are compared with the total value Vtotal of the measured cell voltages of the battery cells 20-1 to 20-n in each battery module 11-1 to 11-7 shown in equation (4), the following result is obtained.

[0060] Vdet-Vtotal =(V1+V2+…+V7±Ve)-(V1+V2+…+V7) = ±Ve … (5)

[0061] As shown in the above equation, the voltage ±Ve of the fluctuation components generated across the resistance components Rda and Rdb can be obtained from the difference voltage (Vdet-Vtotal) between the measured voltage Vdet (first detected voltage) at the charge / discharge lines 35a and 35b, the connectors 45-1 to 45-7, the connectors 60-1 to 60-7, and the connectors 13-1 to 13-7, which is sent from the communication connector 46 via the communication connector 57 and converted into digital data by the A / D converter 58 (first voltage detection unit), and the total value Vtotal (second detected voltage) of the measured cell voltages of the battery cells 20-1 to 20-n of each battery module 11-1 to 11-7, which is obtained from the AFE circuit elements 530-1 to 530-7 (second voltage detection unit) and calculated by the microprocessor 54. As deterioration of the charge / discharge lines 35a and 35b, the connectors 45-1 to 45-7, the connectors 60-1 to 60-7, and the connectors 13-1 to 13-7 progresses, the resistance components Rda and Rdb increase, and the fluctuation component voltage ±Ve increases. Therefore, the microprocessor 34 (evaluation unit) can evaluate the deterioration of the charge / discharge lines 35a and 35b, the connectors 45-1 to 45-7, the connectors 60-1 to 60-7, and the connectors 13-1 to 13-7 by comparing the difference voltage between the measured voltage Vdet of the charge / discharge lines 35a and 35b and the total value Vtotal of the measured values ​​of the cell voltages of the battery cells 20-1 to 20-n of each battery module 11-1 to 11-7.

[0062] In the above example, the measured voltage Vdet sent to the charge / discharge lines 35a and 35b, the connectors 45-1 to 45-7, the connectors 60-1 to 60-7, and the connectors 13-1 to 13-7 is converted into digital data by the A / D converter 58 via the communication connector 46 and the communication connector 57 and sent to the microprocessor 54. However, the measured voltage Vdet sent to the charge / discharge lines 35a and 35b, the connectors 45-1 to 45-7, the connectors 60-1 to 60-7, and the connectors 13-1 to 13-7 may be converted into digital data by the AFE 53 and sent to the microprocessor 54.

[0063] FIG. 10 is a flowchart used to explain the power storage control system according to the embodiment of the present invention.

[0064] (Step S101) The microprocessor 54 acquires the measured voltage Vdet of the charge / discharge lines 35a and 35b.

[0065] (Step S102) The microprocessor 54 calculates the total value Vtotal of the measured cell voltages of the battery cells 20-1 to 20-n of the battery modules 11-1 to 11-7.

[0066] (Step S103) The microprocessor 54 calculates the difference voltage between the measured voltage Vdet of the charge / discharge lines 35a and 35b and the total value Vtotal of the measured cell voltages of the battery cells 20-1 to 20-n of each of the battery modules 11-1 to 11-7.

[0067] (Step S104) The microprocessor 54 determines whether the difference voltage between the measured voltage Vdet and the total value Vtotal is greater than a predetermined value Vth. If the difference voltage between the measured voltage Vdet and the total value Vtotal is smaller than the predetermined value Vth (Step S104: No), the microprocessor 54 ends the process. If the difference voltage between the measured voltage Vdet and the total value Vtotal is greater than the predetermined value Vth (Step S104: Yes), the microprocessor 54 returns to Step S10. 5 Proceed to next step.

[0068] (Step S105) The microprocessor 54 determines that the charge / discharge paths between the charge / discharge lines 35a and 35b, the connectors 45-1 to 45-7, the connectors 60-1 to 60-7, and the connectors 13-1 to 13-7 have deteriorated, and outputs a warning.

[0069] As described above, in this embodiment, by comparing the measured voltage Vdet at charge / discharge lines 35a and 35b, connectors 45-1 to 45-7, connectors 60-1 to 60-7, and connectors 13-1 to 13-7 with the total value Vtotal of the measured cell voltages of battery cells 20-1 to 20-n in each battery module 11-1 to 11-7, it is possible to evaluate deterioration in the charge / discharge paths of charge / discharge lines 35a and 35b, connectors 45-1 to 45-7, connectors 60-1 to 60-7, and connectors 13-1 to 13-7.

[0070] The power supply system 10 in the above-described embodiment may be realized in whole or in part by a computer. In this case, a program for realizing this function may be recorded in a computer-readable recording medium, and the program recorded in the recording medium may be read into a computer system and executed to realize the function. The term "computer system" as used herein includes hardware such as an OS and peripheral devices. The term "computer-readable recording medium" refers to portable media such as flexible disks, optical magnetic disks, ROMs, and CD-ROMs, and storage devices such as hard disks built into a computer system. The term "computer-readable recording medium" may also include a medium that dynamically holds a program for a short period of time, such as a communication line when a program is transmitted via a network such as the Internet or a communication line such as a telephone line, and a medium that holds a program for a certain period of time, such as a volatile memory inside a computer system that is a server or client in such a case. The above-described program may be a program for realizing a part of the above-described function, or may be a program that can realize the above-described function in combination with a program already recorded in the computer system, or may be a program that is realized using a programmable logic device such as an FPGA.

[0071] In the above-described embodiment, the power supply system may be configured as shown in Fig. 11. Fig. 11 is a block diagram showing an outline of another configuration example of the power supply system according to the present invention. In a power supply system 10A in Fig. 11, a solar panel 2, a storage battery unit 3, and an EV stand 4 are each independently connected to power conditioners 1A, 1B, and 1C, respectively. In FIG. 11, each of power conditioners 1A, 1B, and 1C supplies or demands power (electrical energy) between a solar panel 2, a storage battery unit 3, and an EV stand 4, respectively, via a distribution board 6. The configuration and operation of the storage battery unit 3 in FIG. 11 are similar to those of the storage battery unit 3 in the present embodiment already described.

[0072] In the above-described embodiment, the power supply system may be configured as shown in Fig. 12. Fig. 12 is a block diagram showing an outline of another configuration example of the power supply system according to the present invention. In a power supply system 10B in Fig. 12, the solar panel 2 and the storage battery unit 3 are each connected to a power conditioner 1D, and the EV stand 4 is connected to a power conditioner 1C. In FIG. 12, each of power conditioners 1C and 1D supplies or demands power (electrical energy) between a solar panel 2, a storage battery unit 3, and an EV stand 4, via a distribution board 6, respectively. The configuration and operation of the storage battery unit 3 in FIG. 12 are similar to those of the storage battery unit 3 in the present embodiment already described.

[0073] Although an embodiment of the present invention has been described in detail above with reference to the drawings, the specific configuration is not limited to this embodiment, and designs that do not deviate from the gist of the present invention are also included. [Explanation of symbols]

[0074] 1...power conditioner, 2...solar panel, 3...storage battery unit, 11 (11-1 to 11-7)...battery module, 12...control management module, 35a, 35b...charge and discharge line, 40...HV board, 50...BMS board, 53...AFE, 54...microprocessor, 530-1 to 530-7...AFE circuit element

Claims

1. A power storage control system that controls charging and discharging of a battery module that constitutes a storage battery used in a storage battery unit, a first voltage detection unit that detects a first voltage from a voltage of a charge / discharge line that charges or discharges storage energy to or from the battery module; a second voltage detection unit that detects a second voltage from a total value of cell voltages of the battery module; an evaluation unit that compares the first voltage with the second voltage to evaluate the charge / discharge line; Equipped with The evaluation unit is comparing the first voltage with the second voltage, and evaluating that the charge / discharge line is deteriorated when a voltage difference between the first voltage and the second voltage is greater than a predetermined value; Energy storage control system.

2. 2. The energy storage control system according to claim 1, wherein the first voltage detection unit detects a voltage at a position farther from the battery module in the charge / discharge line in a power path for charging or discharging the storage energy between the battery module and the charge / discharge line.

3. 3 . The power storage control system according to claim 1 , wherein the second voltage detection unit detects the voltage by calculating a total value of cell voltages measured by an analog front-end circuit that manages cell voltages of the battery module.

4. 4. The power storage control system according to claim 1, wherein the evaluation unit determines that a resistance value of the charge / discharge line has increased when a voltage difference between the first voltage and the second voltage is greater than a predetermined value.

5. A power storage control method for controlling charging and discharging of a battery module constituting a storage battery used in a storage battery unit, detecting a first voltage from a voltage of a charge / discharge line that charges or discharges storage energy to or from the battery module; detecting a second voltage from a sum of the cell voltages of the battery module; The first voltage is compared with the second voltage, and when a voltage difference between the first voltage and the second voltage is greater than a predetermined value, the charge / discharge line is evaluated as being deteriorated. This is a power storage control method.

Images