Battery system

Abstract

To provide a battery system capable of suppressing damage.SOLUTION: A battery system having a battery which is connected to a power system includes: a detection unit which detects abnormality of the battery system; and a battery control unit for allowing the battery to perform discharge to the power system when the detection unit detects abnormality.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a battery system.

Background Art

[0002] A battery system includes a rechargeable secondary battery. When an abnormality such as overheating of the battery occurs, there is a technique of cooling the battery with a refrigerant (Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, it may be difficult to cool the battery. If the battery is not cooled, there is a risk of damage to the battery system and its surroundings. Therefore, an object is to provide a battery system capable of suppressing damage.

Means for Solving the Problems

[0005] The above object can be achieved by a battery system having a battery, wherein the battery is connected to a power grid, and includes a detection unit that detects an abnormality of the battery system, and a battery control unit that causes the battery to discharge to the power grid when the detection unit detects an abnormality.

[0006] The battery control unit may cause the discharge until the SOC of the battery reaches a predetermined amount.

[0007] The battery control unit may cause the battery to discharge at the maximum discharge rate.

[0008] The detection unit may detect the abnormality based on any one of the current, voltage, and temperature of the battery.

[0009] The detection unit may detect the abnormality based on information around the battery system.

Advantages of the Invention

[0010] It is possible to provide a battery system capable of suppressing damage.

Brief Description of the Drawings

[0011]

Figure 1

Figure 2

Modes for Carrying Out the Invention

[0012] (Battery System) FIG. 1(a) is a schematic diagram illustrating a battery system 100. The battery system 100 can store the electric power generated by the power generation device 1 and discharge the electric power to the power grid 30. The power generation device 1 is, for example, a device using renewable energy, such as a solar power generation device or a wind power generation device.

[0013] The battery system 100 includes a battery 10 and a control device 20. The battery 10 and the control device 20 are electrically connected to each other by a cable or the like. The battery 10 is electrically connected to the power grid 30 via the control device 20.

[0014] The battery 10 is, for example, a battery pack including a plurality of battery cells. The battery cells include secondary batteries. A secondary battery is a battery capable of charging and discharging, such as a lithium-ion battery, a lithium-ion polymer battery, a nickel-metal hydride battery, a nickel-cadmium battery, a nickel-iron storage battery, a nickel-zinc storage battery, a lead storage battery, a silver-zinc oxide storage battery, and the like. The battery 10 is charged by the electric power generated by the power generation device 1. The battery 10 can discharge electric power to the power grid 30. The remaining capacity (SOC: State of charge) of the battery 10 increases by charging and decreases by discharging. The power grid 30 includes electric wires and power consumers, etc.

[0015] The battery system 100 includes a temperature sensor 40, a current sensor 42, and a voltage sensor 44. The temperature sensor 40 detects the temperature of the battery 10. The current sensor 42 detects the current flowing through the battery system 100. The voltage sensor 44 detects the voltage of the battery system 100.

[0016] The control device 20 of the battery system 100 is connected to the external device 2 via the communication network NW. The external device 2 is a device managed by public institutions and enterprises, such as a server. The external device 2 transmits information around the battery system 100 to the control device 20. The information is, for example, information such as weather and disasters.

[0017] The control device 20 is a BMS (Battery Management System), includes a computer, and controls the battery system 100. The control device 20 is a control device including an arithmetic device such as a CPU (Central Processing Unit), and storage devices such as a ROM (Read Only Memory) and a RAM (Random Access Memory), and performs various controls by executing a program stored in the storage device.

[0018] FIG. 1(b) is a schematic diagram illustrating the hardware configuration of the control device 20. The control device 20 includes a CPU 200, a RAM 202, a ROM 204, a storage device 206, and a network interface (I / F) 208. The CPU 200, the RAM 202, the ROM 204, the storage device 206, and the network I / F 208 are connected to each other by a bus.

[0019] The storage device 206 is a non-volatile storage medium such as, for example, a hard disk drive (HDD) and a flash memory. The network I / F 208 is connected to the communication network NW in FIG. 1.

[0020] Programs stored in the ROM 204 and the storage device 206 are temporarily stored in the RAM 202. By executing the programs stored in the RAM 202, the CPU 200 realizes various functions described later and executes various processes described later. The programs may be in accordance with the flowcharts described later.

[0021] As shown in FIG. 1(a), the control device 20 is connected to the battery 10 and the power system 30. The control device 20 is connected to a temperature sensor 40, a current sensor 42, and a voltage sensor 44, and receives signals output from these sensors. The control device 20 acquires the temperature detected by the temperature sensor 40, the current detected by the current sensor 42, and the voltage detected by the voltage sensor 44.

[0022] The control device 20 functions as a detection unit 22 and a battery control unit 24. The detection unit 22 detects an abnormality in the battery system 100. The abnormality means an abnormality in the state of the battery system 100 or a possibility of damage to the battery system 100. The abnormality is, for example, that the current is equal to or greater than a predetermined value, the voltage is equal to or greater than a predetermined value, the temperature of the battery 10 is equal to or higher than a predetermined temperature, or a disaster has occurred around the battery system 100. For example, if the temperature of the battery 10 rises excessively, there is a possibility of damage to the battery system 100. If the battery system 100 is damaged by a disaster around it, the battery 10 may overheat.

[0023] The battery control unit 24 controls the battery 10. The battery control unit 24 causes the battery 10 to perform discharge and stops the discharge. The battery control unit 24 acquires the state of charge (SOC) of the battery 10 and the power demand from the power system 30, etc., and controls the charge and discharge of the battery 10. The battery control unit 24 can control the discharge rate of the discharge.

[0024] FIG. 2 is a flowchart illustrating the processing in the embodiment. In response to a request from the power system 30, the battery 10 is being charged (step S10). The detection unit 22 of the control device 20 monitors the battery system 100 and determines whether an abnormality has been detected (step S12). In the case of a negative determination (No), step S10 is repeated. In the case of an affirmative determination (Yes), the battery control unit 24 causes the battery 10 to discharge to the power system 30 (step S14). The battery control unit 24 sets the discharge rate of the discharge to, for example, the maximum rate.

[0025] The battery control unit 24 determines whether the SOC of the battery 10 has reached a predetermined amount Sth (step S16). The predetermined amount Sth is, for example, 0%. In the case of a negative determination, the discharge continues. In the case of an affirmative determination, the battery control unit 24 stops the discharge (step S18). The processing of FIG. 2 ends here.

[0026] According to the embodiment, when the detection unit 22 detects an abnormality, the battery control unit 24 causes the battery 10 to discharge. The state of charge (SOC) of the battery 10 decreases due to the discharge. By decreasing the SOC, heat generation of the battery 10 is suppressed and the current also decreases. Therefore, damage to the battery system 100 can be suppressed.

[0027] The battery control unit 24 causes the battery 10 to discharge until the SOC reaches 0%. The energy of the battery 10 is depleted due to the discharge. Heat generation is effectively suppressed. The current and voltage output by the battery 10 also decrease. Therefore, damage can be effectively suppressed. The SOC after discharge may be 0% or may be 5% or less, 10% or less, etc.

[0028] The battery control unit 24 causes the battery 10 to discharge at the maximum discharge rate. Since the SOC of the battery 10 decreases rapidly, damage can be suppressed.

[0029] The detection unit 22 may detect an abnormality based on any one of the current, voltage, and temperature of the battery 10. For example, when a large current flows through the battery system 100, a large voltage is output, or the battery 10 is overheated, the detection unit 22 detects an abnormality. Discharge is executed and the SOC decreases. The current and voltage decrease. The temperature of the battery 10 also becomes less likely to rise. Damage can be suppressed. The detection unit 22 may detect an abnormality from events other than the current, etc.

[0030] The detection unit 22 may detect an abnormality based on information around the battery system 100. For example, information indicating that a disaster is occurring near the battery system 100 is transmitted from the external device 2 to the control device 20. The detection unit 22 detects the information on the disaster as an abnormality. The battery control unit 24 discharges the battery 10. Expansion of damage can be suppressed.

[0031] The battery system 100 is installed in a place away from urban areas, for example, in a mountainous area. There may be no people stationed near the battery system 100. It takes time for workers for maintenance or the like to arrive at the battery system 100. According to the embodiment, the control device 20 automatically discharges the battery 10. Even without personnel, damage can be suppressed.

[0032] Although a preferred embodiment of the present invention has been described in detail above, the present invention is not limited to such a specific embodiment, and various modifications and variations are possible within the scope of the gist of the present invention described in the claims. [Explanation of symbols]

[0033] 1 power generation device, 2 external device, 10 battery, 20 control device, 22 detection unit, 24 battery control unit, 30 power system, 40 temperature sensor, 42 current sensor, 44 voltage sensor, 100 battery system, 200 CPU, 202 RAM, 204 ROM, 206 storage device, 208 network I / F

Claims

1. A battery system having a battery, wherein the battery is connected to a power grid, a detection unit that detects an abnormality of the battery system, and a battery control unit that causes the battery to discharge to the power grid when the detection unit detects an abnormality. A battery system comprising the above components.

2. The battery system according to Claim 1, wherein the battery control unit causes the discharge to be performed until the state of charge (SOC) of the battery reaches a predetermined amount.

3. The battery system according to Claim 1 or 2, wherein the battery control unit causes the battery to perform the discharge at a maximum discharge rate.

4. The battery system according to Claim 1 or 2, wherein the detection unit detects the abnormality based on any one of the current, voltage, and temperature of the battery.

5. The battery system according to Claim 1 or 2, wherein the detection unit detects the abnormality based on information around the battery system.

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