HIGH VOLTAGE-TYPE REDOX FLOW BATTERY COMPRISING SOC BALANCING DEVICE

Abstract

The present invention relates to a high voltage-type redox flow battery comprising: a plurality of modules (100.sub.1, 100.sub.2, 100.sub.3, . . , 100.sub.n) which are serially connected; and a battery management system (BMS) for monitoring a state-of-charge (SOC) of each of the plurality of modules (100.sub.1, 100.sub.2, 100.sub.3, .., 100.sub.n), wherein each of the modules (100.sub.1) includes an SOC balancing device comprising a stack (10), a positive electrode electrolyte tank (30a), a positive electrode pump (20a) for providing a positive electrode electrolyte of the positive electrode electrolyte tank (30a) to the stack (10), a positive electrode inlet pipe (21a) connecting the positive electrode electrolyte pump (20a) to the stack (10), a positive electrode outlet pipe (11a) connecting the stack (10) to the positive electrode electrolyte tank (30a), a positive electrode tank outlet pipe (31a) connecting the positive electrode electrolyte tank (30a) to the positive electrode electrolyte pump (20a), a negative electrode electrolyte tank (30b), a negative electrode pump (20b) for providing a negative electrode electrolyte of the negative electrode electrolyte tank (30b) to the stack (10), a negative electrode inlet pipe (21b) connecting the negative electrode electrolyte pump (20b) to the stack (10), a negative electrode outlet pipe (11b) connecting the stack (10) to the negative electrode electrolyte tank (30b), and a negative electrode tank outlet pipe (31b) connecting the negative electrode electrolyte tank (30b) to the negative electrode electrolyte pump (20b).

Claims

1. A high voltage-type redox flow battery including an SOC balancing device comprising a plurality of serially connected modules (100.sub.1, 100.sub.2, 100.sub.3, .., 100.sub.n); a battery management system (BMS) monitoring a state of charge (SOC) of the plurality of modules (100.sub.1, 100.sub.2, 100.sub.3, .., 100.sub.n); and a plurality of DC/DC converters (200.sub.1, 200.sub.2, 200.sub.3, .., 200.sub.n) connected in parallel with each of the modules, wherein each (100.sub.1) of the modules includes a stack (10), a catholyte tank (30a), a catholyte pump(20a) for providing a catholyte of the catholyte tank (30a) to the stack (10), a catholyte inlet pipe (21a) connecting the catholyte pump(20a) and the stack (10), a catholyte outlet pipe (11a) connecting the stack (10) and the catholyte tank (30a), a catholyte tank outlet pipe (31a) connecting the catholyte tank (30a) and the catholyte pump (20a), an anolyte tank (30b), an anolyte pump (20b) for providing an anolyte of the anolyte tank (30b) to the stack (10), an anolyte inlet pipe (21b) connecting the anolyte pump (20b) and the stack (10), an anolyte outlet pipe (11b) connecting the stack (10) and the anolyte tank (30b), and an anolyte tank outlet pipe (31b) connecting the anolyte tank (30b) and the anolyte pump (20b), wherein total number of the plurality of modules must meet following 1) and 2) conditions 1. the lowest voltage of the stack (10)?(total number of modules-1)>the lowest convertible voltage of the preset PCS (Power Control System), 2. the highest voltage of the stack (10)?the number of the total modules<the maximum convertible voltage of the preset PCS, wherein the plurality of modules (100.sub.1, 100.sub.2, 100.sub.3, . . . , 100.sub.n) are manually or automatically connected to bypass circuits (109.sub.1, 109.sub.2, . . . 109.sub.n) so that in case that a module has a problem, only the other modules without the problematic module can be connected in series, wherein output terminals of the plurality of DC/DC converters (200.sub.1, 200.sub.2, 200.sub.3, .., 200.sub.n,) are connected to a common busbar (300), and wherein a battery management system (BMS) monitors the SOC of each module in real time during charging and discharging, and a current applied to each module is to satisfy the following equations
In=I+I?dIn (In: a current applied to the n.sup.th module, I: a system current, dIn: an added or subtracted current) Charging: dIn=(SOCavg?SOCn)/SOCavg (SOCavg: average SOC of available modules, SOCn: SOC of n.sup.th module) Discharging: dIn=(SOCn?SOCavg)/SOCavg (SOCavg: average SOC of available modules, SOCn: SOC of n.sup.th module).

2. A high voltage-type redox flow battery including an SOC balancing device of claim 1, wherein each (100.sub.1) of the modules comprises a first connection pipe (22a) connecting the catholyte inlet pipe (21a) and the anolyte outlet pipe (11b), a second connection pipe (22b) connecting the anolyte inlet pipe (21b) and the catholyte outlet pipe (11a), and a third connection pipe (33) connecting the catholyte tank (30a) and the anolyte tank (30b), wherein first to third automatic valves (23a, 23b, 33a) are installed in the first to third connection pipes (22a, 22b, 33).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0029] FIG. 1A is a diagram illustrating leakage currents in one stack including a plurality of cells 9.

[0030] FIG. 1B is a conceptual diagram of one module of a conventional redox flow battery having a plurality of stacks.

[0031] FIG. 2 is a redox flow battery configuration diagram of the present invention.

[0032] FIG. 3a is a block diagram of a first module 100.sub.1 according to the present invention.

[0033] FIG. 3b is a configuration diagram of a state including a plurality of stacks 10a, 10b, 10c in FIG. 3a.

BEST MODE FOR PERFORMING THE INVENTION

[0034] Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

[0035] The accompanying drawings show an exemplary form of the present invention, which is provided to describe the present invention in more detail, and the technical scope of the present invention is not limited thereto.

[0036] In the present invention, a module 100.sub.1 consisting of a plurality of parallelly connected stacks 10a, 10b, and 10c as shown in FIG. 3b is electrically connected in series as a multiple type (100.sub.1, 100.sub.2, 100.sub.3, .., 100.sub.n) as shown in FIG. 2.

[0037] Since the entire line must be stopped when any one of the modules fails in the serially connected modules, one spare module is included.

[0038] The number of serially connected modules including one spare module, is determined to satisfy the following formula.

[0039] Lowest voltage of stack x (number of total modules-1)>Lowest convertible voltage of PCS (Power Control System).

[0040] Maximum voltage of stack x number of total modules<Convertible maximum voltage of PCS

[0041] For example, in case that a convertible voltage range of the 380V three-phase PCS is 600-1000V and the minimum/maximum voltage of the stack (output of one module is the same as one stack voltage since stacks are connected in parallel) is 40/60V, it would be desirable that the number of modules is 16 and the output voltage is 640/960V.

[0042] In this case, even if one module fails, the total minimum voltage would belong to the convertible voltage range as 600V.

[0043] In case that any one module fails or requires maintenance, bypass circuits 109.sub.1, 109.sub.2, . . . 109.sub.n are included to bypass the module manually or automatically.

[0044] The system includes at least one of the following passive balancing and active balancing devices.

[0045] In passive balancing as shown in FIG. 3a [simplifying a plurality stacks 10a, 10b, and 10c into one stack 10] and FIG. 3b, each module 100.sub.1 includes remixing pipes for mixing electrolytes between a cathode and an anode and an automatically controlled valve.

[0046] The present invention includes a first connection pipe 22a connecting a catholyte inlet pipe 21a for supplying the catholyte from the catholyte pump 20a to the stack 10 and an anolyte outlet pipe 11b for supplying the anolyte from the stack 10 to the anolyte tank 30b, a second connection pipe 22b connecting an anolyte inlet pipe 21b for supplying the anolyte from the anolyte pump 20b to the stack 10 and a catholyte outlet pipe 11a for supplying the catholyte from the stack 10 to the catholyte tank 30a and a third connection pipe 33 connecting the catholyte tank 30a and the anolyte tank 30b.

[0047] In addition, first to third automatic valves 23a, 23b, 33a are installed in the first to third connection pipes 22a, 22b, 33 so that opening and closing can be automatically controlled.

[0048] When the first to second automatic valves 23a and 23b are opened, the electrolytes are mixed to different electrodes through the first and second connection pipes 22a and 22b to be discharged and energy is consumed. The amount of discharge may be adjusted by adjusting the opening and closing time of the valve.

[0049] The third connection pipe 33 is a water level maintenance pipe to prevent the water level of one tank from rising. Also, a water level sensor may be added in a place such as a tank and a safety device may be added in order to adjust a third automatic valve 33a in case that the sensor senses that the water level of any one tank is higher or lower than a reference.

[0050] BMS (battery management system) monitors SOC and stack voltage of each module during charging in a system consisting of serially connected RFB module 100.sub.1, 100.sub.2, 100.sub.3, .., 100.sub.n and implements passive balancing by opening or closing the first to second automatic valves 23a and 23b of a specific module to perform partial discharge when the SOC or stack voltage of the specific module is higher than a reference.

[0051] At this time, the opening and closing timing of the valve can be implemented by using a table obtained through experiments in advance, or monitoring SOC and stack voltages in real time and closing the valve again when the desired value is reached.

[0052] Active balancing is implemented in the following method. Each module includes DC/DC converters 200.sub.1, 200.sub.2, 200.sub.3, .., 200.sub.n connected in parallel with the modules. The output power terminals of DC/DC converters 200.sub.1, 200.sub.2, 200.sub.3, .., 200.sub.n are connected to a common bus bar 300 and have a structure that can transfer energy of a specific module to another module through the DC/DC converters.

[0053] The BMS monitors the SOC of each module in real time during charging and discharging and controls the DC/DC converters such that a current applied to each module is as follows.

In=I+I?dIn

[0054] In: a current applied to the n.sup.th module, I: a system current, dIn: an added or subtracted current

[0055] Charging: dIn=(SOCavg?SOCn)/SOCavg (SOCavg: average SOC of available modules, SOCn: SOC of n.sup.th module)

[0056] Discharge: dIn=(SOCn?SOCavg)/SOCavg (SOCavg: average SOC of available modules, SOCn: SOC of n.sup.th module)

EXPLANATION OF REFERENCE NUMERALS

[0057]

TABLE-US-00001 9: Cells 10, 10a, 10b, 10c: Stacks 11a: a catholyte outlet pipe 11b: an anolyte outlet pipe 20a: a catholyte pump 20b: an anolyte pump 21a: a catholyte inlet pipe 21b: an anolyte inlet pipe 30a: a catholyte tank 30b: an anolyte tank 31a: a catholyte tank outlet pipe 31b: an anolyte tank outlet pipe

[0058] It will be obvious to those of ordinary skill in the art to which the present invention belongs that the present invention is not limited by the above-described embodiments and accompanying drawings, but can be replaced, added, and changed without departing from the technical idea of the present invention.