Battery Control System

Abstract

To provide a power storage battery control system capable of detecting whether a battery module is surely connected and protecting an element.SOLUTION: A power storage battery control system includes connection detection portions 101-1, ... that detect the presence or absence of a current flowing through a second negative electrode terminal from a second positive electrode terminal and are provided between the second positive electrode terminal and the second negative electrode terminal of a connection terminal of a control substrate, and to which a first positive electrode terminal and a first negative electrode terminal of battery modules 11-1, ... are connected, and a determination control unit that determines whether the battery module is normally connected to the connection terminal on the basis of information indicating the presence or absence of a current supplied from the connection detection portions 101-1, ...SELECTED DRAWING: Figure 10A

Description

[Technical field]

[0001] The present invention relates to a battery control system. [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 storage battery unit for use in such a power supply system, a configuration has been proposed in which a plurality of battery cells are connected in series to form a battery stack so that a desired voltage can 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.

[0003] Balancing is essential for the battery cells that make up the battery stack. For this reason, such a storage battery unit is equipped with an AFE (Analog Front End) that detects the voltage of each battery cell and a balancing circuit. The AFE detects the voltage of each battery cell, and balance adjustment is performed so that the charge amount of each battery cell is uniform. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2020-156200 A Summary of the Invention [Problem to be solved by the invention]

[0005] As described above, in a storage battery unit in which a plurality of battery cells are connected in series to form a battery stack, high and low voltages coexist. In such an environment, if the ratings are not strictly observed, there is a risk that circuit elements will be destroyed.

[0006] In other words, the voltage generated by connecting multiple battery cells in series is several hundred volts. In contrast, the voltage of a battery cell is a low voltage of several volts. The AFE detects the battery cell voltage of several volts from such a battery stack (storage battery) that can be several hundred volts. If the connectors and other connections are not securely connected, a voltage exceeding the rated voltage may be applied to the AFE, posing a risk of damaging the AFE.

[0007] In view of the above-mentioned problems, an object of the present invention is to provide a storage battery control system that can detect whether battery modules are securely connected and can protect elements. [Means for solving the problem]

[0009] A battery control system according to one embodiment of the present invention is a battery control system that controls the voltage of battery modules that constitute a battery, and manages the connection state of the battery modules, and is provided on the control board and includes a cell voltage measurement circuit that measures the voltage of each of the serially connected cell batteries that constitute the battery module, a switch unit provided between the negative terminal and the positive terminal of each of the measurement terminals in the cell voltage measurement circuit that are composed of a positive terminal and a negative terminal to which the cell batteries are connected, and a conductivity control unit that controls the on / off of each of the switch units. Effect of the Invention

[0010] According to the present invention, the battery modules constituting the storage battery can be reliably connected to the control board via connectors, and the elements can be protected. [Brief description of the drawings]

[0011] [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] 1 is a block diagram showing an overview of a power storage control system according to a first embodiment of the present invention. [Figure 10A] FIG. 4 is a diagram showing a specific configuration of a connection detection unit. [Figure 10B] FIG. 4 is a diagram showing a specific configuration of a connection detection unit. [Figure 11] FIG. 5 is a block diagram showing an outline of a power storage control system according to a second embodiment of the present invention. [Figure 12] FIG. 4 is a connection diagram showing a specific configuration of a switch unit. [Figure 13] FIG. 11 is a block diagram showing an outline of a power storage control system according to a third embodiment of the present invention. [Figure 14] 10 is a flowchart showing control in a power storage control system according to a third embodiment of the present invention. [Figure 15] FIG. 13 is a block diagram showing an outline of another configuration example of a power supply system according to the present invention. [Figure 16] 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

[0012] 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.

[0013] 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.

[0014] 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.

[0015] 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.

[0016] 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.

[0017] 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.

[0018] 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.

[0019] 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.

[0020] 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.

[0021] 3, the relay cable 60 is made up of connectors 61 (61-1 to 61-7) on the battery modules 11-1 to 11-7 side, connectors 62 (62-1 to 62-7) on the control management module 12 side, and cables 63 (63-1 to 63-7) therebetween. The cables 63 (63-1 to 63-7) are two wires, one for a positive electrode and one for a negative electrode.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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 in 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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, and connectors 45-1 to 45-7 are mounted.

[0031] 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.

[0032] 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 constitute 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. The positive electrode of the connector 45-1 with the highest potential is connected to the charging and discharging line 35a, and the negative electrode of the connector 45-7 with the lowest potential is connected to the charging and discharging line 35b.

[0033] 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 which is an optical isolation element, and connectors 56-1 to 56-7.

[0034] 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.

[0035] AFE 53 detects the cell voltage of each of battery modules 11-1 to 11-7 and converts it into digital data.

[0036] 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.

[0037] The optical isolation element is an element such as a photocoupler or a digital isolator, and connects between the AFE 53 and the microprocessor 54. Since a high voltage is applied to the AFE 53, a photocoupler 55 provides isolation between the AFE 53 and the microprocessor 54.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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 to digital values ​​by the AFE circuit elements 530-1 to 530-7 and sent to the microprocessor 54 via the photocoupler 55, which is an optical isolation element.

[0046] <First embodiment> The battery control system according to the present invention is applied to the connection between the battery modules 11-1 to 11-7 and the BMS board 30 in the battery unit 3 configured as described above.

[0047] As shown in FIG. 8, when battery modules 11-1 to 11-7 correspond to AFE circuit elements 530-1 to 530-7, if the connection between battery modules 11-1 to 11-7 and BMS board 30 is insufficient, AFE circuit elements 530-1 to 530-7 may be damaged.

[0048] For example, assume that the wiring between battery module 11-7 and AFE circuit element 530-7 is missing in Fig. 8. In this case, power is supplied from battery modules 11-1 to 11-6 to AFE circuit elements 530-1 to 530-6, but no power is supplied to AFE circuit element 530-7.

[0049] In this state, if AFE circuit elements 530-1 to 530-7 are connected in series, a voltage from terminal Am of AFE circuit element 530-6 will be supplied to terminal A1 of AFE circuit element 530-7 when no voltage is supplied to terminal Am of AFE circuit element 530-7. If a voltage is supplied to terminal A1 of AFE circuit element 530-7 when the voltage of terminal Am of AFE circuit element 530-7 is not yet determined, the potential will be reversed, creating a risk of damaging AFE circuit elements 530-1 to 530-7.

[0050] Therefore, in this embodiment, the connection state between each of the battery modules 11-1 to 11-7 and the AFE circuit elements 530-1 to 530-7 can be detected.

[0051] 9 is a block diagram showing an outline of the power storage control system according to the first embodiment of the present invention. As described above, the battery modules 11-1 to 11-7 are connected to the BMS board 30 by the relay cables 70-1 to 70-7. If the connection between the connectors 72-1 to 72-7 of the relay cables 70-1 to 70-7 and the connectors 56-1 to 56-7 of the BMS board 30 is incomplete, there is a risk of damaging the AFE circuit elements 530-1 to 530-7, as described above.

[0052] In this embodiment, connection detectors 101 (101-1 to 101-7) are provided on the paths from connectors 56-1 to 56-7 to AFE circuit elements 530-1 to 530-7. More specifically, connection detector 101-1 is configured as shown in Figures 10A and 10B. The other connection detectors 101-2 to 102-7 are configured similarly.

[0053] 10A and 10B are connection diagrams showing a specific configuration of the connection detection unit 101-1. As shown in Fig. 10A and 10B, the connection detection unit 101-1 is composed of photocouplers 121 and 122, which are insulating elements, and a MOS transistor 123. Any element may be used as the photocoupler 121 as long as it is an optical insulating element that converts an input electrical signal into an optical signal once with a light-emitting element, and then converts the optical signal back into an electrical signal with a light-receiving element to output it.

[0054] Among the wirings from the connector 56-1 to the AFE circuit element 530-1, the wiring L+ has the maximum potential and the wiring L- has the minimum potential. The phototransistor side constituting the photocoupler 121 and the diode side constituting the photocoupler 122 are connected between the wiring L+ and the wiring L-. The diode side of the photocoupler 121 is driven by the MOS transistor 123. A connection detection signal S1 is supplied to the gate of the MOS transistor 123. A connection check result signal S2 is derived from the transistor side of the photocoupler 122.

[0055] Fig. 10A shows a state in which the connector 72-1 of the relay cable 70-1 and the connector 56-1 of the BMS board 30 are securely connected. As shown in Fig. 10A, if the connection between the connector 72-1 of the relay cable 70-1 and the connector 56-1 of the BMS board 30 is perfect, when the microprocessor 54 supplies a connection detection signal S1 to the gate of the MOS transistor 123, the MOS transistor 123 turns on, the photocoupler 121 turns on, and a current flows between the wiring L+ and the wiring L-. This turns on the photocoupler 122, and the photocoupler 122 outputs a connection check result signal S2.

[0056] 10B shows a state in which the connection between the connector 72-1 of the relay cable 70-1 and the connector 56-1 of the BMS board 30 is incomplete. As shown in FIG. 10B, if the connection between the connector 72-1 of the relay cable 70-1 and the connector 56-1 of the BMS board 30 is incomplete, no current flows between the wiring L+ and the wiring L-, and the connection check result signal S2 is not output from the photocoupler 122.

[0057] As described above, in the first embodiment of the present invention, the connection detection units 101-1 to 101-7 are provided between the wiring L+ from the second positive terminal and the wiring L- from the second negative terminal of the connectors 56-1 to 56-7 (connection terminals) of the BMS board 50 to which the first positive terminal and the first negative terminal of the battery modules 11-1 to 11-7 are connected, respectively. The connection detection units 101-1 to 101-7 detect the presence or absence of a current flowing through the wiring L+ from the second positive terminal and the wiring L- from the second negative terminal. The microprocessor 54 (determination control unit) determines whether the battery modules 11-1 to 11-7 are normally connected to the connection terminals based on information indicating the presence or absence of a current supplied from the connection detection units 101-1 to 101-7. This allows the connection state between the battery modules 11 (11-1 to 11-7) and the BMS board 30 to be determined.

[0058] <Second embodiment> 11 is a block diagram of an outline of a power storage control system according to a second embodiment of the present invention. As described above, when the battery modules 11-1 to 11-7 correspond to the AFE circuit elements 530-1 to 530-7, if the connection between the battery modules 11-1 to 11-7 and the BMS board 30 is insufficient, the AFE circuit elements 530-1 to 530-7 may be damaged. Therefore, in this embodiment, switch units 102-1, 102-2, ... are provided in the path connecting the AFE circuit elements 530-1 to 530-7 in series to suppress damage to the AFE circuit elements 530-1 to 530-7.

[0059] Fig. 12 is a connection diagram showing a specific configuration of the switch unit 102 (102-1, 102-2, ...). As shown in Fig. 12, the switch unit 102 (102-1, 102-2, ...) is composed of a photo MOS relay 131 which is an optical isolation element. Any optical isolation element may be used as long as it converts an input electrical signal into an optical signal once with a light-emitting element, and then converts the optical signal back into an electrical signal with a light-receiving element to output it.

[0060] 12, a photo MOS relay 131 is provided between a wiring L− of an AFE circuit element 530-1 and a wiring L+ of an AFE circuit element 530-2 located below it. The diode side of the photo MOS relay 131 is driven by a MOS transistor 132.

[0061] When the connection start signal S3 is not supplied to the gate of the MOS transistor 132, the photo MOS relay 131 is turned off. This disconnects the wiring L- of the AFE circuit element 530-1 from the wiring L+ of the AFE circuit element 530-2 located below it.

[0062] When a connection start signal S3 is supplied to the gate of the MOS transistor 132, the photo MOS relay 131 turns on. This connects the wiring L- of the AFE circuit element 530-1 to the wiring L+ of the AFE circuit element 530-2 located below it.

[0063] Thus, in this embodiment, AFE circuit elements 530-1 to 530-7 (cell voltage measurement circuits) that measure the voltage of each of the serially connected cell batteries that make up battery modules 11-1 to 11-7 are provided on the BMS board 50 (control board). Then, for each of terminals A1 to Am (measurement terminals) consisting of positive and negative terminals to which the cell batteries of the AFE circuit elements 530-1 to 530-7 are connected, switch units 102-1 to 102-6 are provided between the negative and positive terminals of adjacent terminals A1 to Am that are serially connected. The switch units 102-1 to 102-6 are each on / off controlled by the microprocessor 54 (continuity control unit). As a result, even if the battery modules 11 (11-1 to 11-7) and the BMS substrate 30 are not connected, damage to the AFE circuit elements 530-1 to 530-7 can be suppressed by cutting off the path connecting the AFE circuit elements 530-1 to 530-7 in series.

[0064] <Third embodiment> 13 is a block diagram showing an outline of a power storage control system according to a third embodiment of the present invention. In this embodiment, connection detection units 101 (101-1 to 101-7) are provided in the paths from connectors 56-1 to 56-7 to AFE circuit elements 530-1 to 530-7, and switch units 102 (102-1, 102-2, ...) are provided in the paths connecting the AFE circuit elements 530-1 to 530-7 in series, thereby preventing damage to the AFE circuit elements 530-1 to 530-7.

[0065] FIG. 14 is a flowchart showing control in the power storage control system according to the third embodiment of the present invention. (Step ST101) The microprocessor 54 transmits a connection detection signal to the connection detection units 101-1 to 102-7.

[0066] (Step ST102) The microprocessor 54 judges the connection detection confirmation signals from the connection detectors 101-1 to 102-7, and judges whether the connections between all the battery modules 11-1 to 11-7 and the BMS board 50 have been made.

[0067] (Step ST103) When the microprocessor 54 determines that all of the AFE circuit elements 530-1 to 530-7 have been connected to the battery modules 11-1 to 11-7 (step ST102: Yes), it supplies a connection start signal to the switch units 102-1, 102-2, . . . to turn on the switch units 102-1, 102-2, . . .

[0068] (Step ST104) If the microprocessor 54 determines that any of the connection points is not connected to the battery modules 11-1 to 11-7 (step ST102: No), it maintains the switch units 102-1, 102-2, ... in the off state and issues a warning to prompt the user to check the connections of the battery modules 11-1 to 11-7.

[0069] In this embodiment, by turning on switch units 102-1, 102-2, ... after all battery modules 11-1 to 11-7 are securely connected to the BMS board 50, damage to AFE circuit elements 530-1 to 530-7 can be prevented and the voltage of each battery cell can be accurately measured.

[0070] In the above-described embodiment, the power supply system may be configured as shown in Fig. 15. Fig. 15 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. 15, the solar panel 2, the storage battery unit 3, and the EV stand 4 are each independently connected to power conditioners 1A, 1B, and 1C, respectively. In FIG. 15, 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. 15 are similar to those of the storage battery unit 3 in the present embodiment already described.

[0071] In the above-described embodiment, the power supply system may be configured as shown in Fig. 16. Fig. 16 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. 16, each of the solar panel 2 and the storage battery unit 3 is connected to a power conditioner 1D, and the EV stand 4 is connected to a power conditioner 1C. In FIG. 16, 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. 16 are similar to those of the storage battery unit 3 in the present embodiment already described.

[0072] 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.

[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] 3...storage battery unit, 11 (11-1 to 11-7)...battery module, 12...control management module, 13 (13-1 to 13-7)...connector, 14 (14-1 to 17-7)...connector, 54...microprocessor, 56 (56-1 to 56-7)...connector, 101 (101-1 to 101-7)...connection detection unit, 102 (102-1 to 102-6)...switch unit, 121, 122...photocoupler, 131...photoMOS relay, 530-1 to 530-7...AFE circuit element

Claims

1. A control board that controls the voltage of a battery module that constitutes a storage battery, and a storage battery control system that manages the connection state of the battery module, a cell voltage measurement circuit provided on the control board for measuring the voltage of each of the cell batteries connected in series that constitute the battery module; In each of the measurement terminals in the cell voltage measurement circuit, which are composed of a positive terminal and a negative terminal to which the cell battery is connected, a switch unit is provided between the negative terminal and the positive terminal of the adjacent measurement terminal connected in series; a conduction control unit that controls on / off of each of the switches; A battery control system comprising:

2. The conduction control unit turns each of the switch units on when the negative electrode terminal and the positive electrode terminal of the battery module are normally connected to all of the measurement terminals, and turns each of the switch units off when any one of the negative electrode terminal and the positive electrode terminal of the battery module is not normally connected to the measurement terminal. The battery control system according to claim 1 .

3. The switch unit is an optical isolation element. The battery control system according to claim 1 or 2.

4. A connection detection unit provided between the positive terminal and the negative terminal of a connection terminal of the control board to which each of the positive terminal and the negative terminal of the battery module is connected, and detecting the presence or absence of a current flowing from the positive terminal of the connection terminal to the negative terminal of the connection terminal; a determination control unit that determines whether or not the battery module is normally connected to the connection terminal based on the information indicating the presence or absence of the current supplied from the connection detection unit; The battery control system according to claim 1, further comprising:

5. The connection detection unit, a current detection unit and a switch unit connected in series between the connection terminals, The determination control unit, When detecting a connection state between the battery module and the connection terminal, the switch unit is turned on; The current detection unit detects the current. The battery control system according to claim 4 .

6. Each of the current detection unit and the switch unit is Each is an optical isolation element. The battery control system according to claim 5 .

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