KR-102963646-B1 - ENERGY STORAGE SYSTEM

KR102963646B1KR 102963646 B1KR102963646 B1KR 102963646B1KR-102963646-B1

Abstract

The present invention relates to an energy storage system that determines whether to operate by predicting the availability of batteries when a malfunction occurs in a cooling means in the energy storage system. The energy storage system comprises a plurality of battery racks, wherein the plurality of battery racks include a plurality of battery trays for accommodating batteries; a battery rack BMS for controlling the temperature, voltage, and current of the plurality of batteries; and one or more cooling fans for cooling the batteries. The battery trays are equipped with one or more sensors for detecting the temperature of the battery trays, the voltage and current of the batteries, and a battery tray BMS for receiving information about the batteries detected by the sensors. The battery rack BMS determines whether the cooling fan is faulty, and if the cooling fan is determined to be faulty, determines whether the battery rack is available under predetermined availability conditions. One or more battery racks determined to be available maintain an electrical connection with the energy storage system, and one or more battery racks determined to be unavailable disconnect the electrical connection with the energy storage system.

Inventors

양보람
이동윤

Assignees

에스케이이노베이션 주식회사

Dates

Publication Date: 20260513
Application Date: 20240226

Claims (8)

In an energy storage system comprising a plurality of battery racks, The above plurality of battery racks are, Multiple battery trays for accommodating batteries; A battery rack BMS that controls the temperature, voltage, and current of the plurality of battery trays; and One or more cooling means for cooling the above battery; comprising, The battery tray comprises one or more sensors that detect the temperature, voltage, and current of the battery tray, and a battery tray BMS that receives information of the battery detected by the sensors. The above battery rack BMS is, Whether the predicted reach temperature of the above battery tray is within a preset available temperature is set as a predetermined available condition, and It is determined whether the above cooling means is faulty, and if the above cooling means is determined to be faulty, the predicted reach temperature of each battery tray is calculated during the period from the time the above cooling means is determined to be faulty until the time the battery rack reaches a target SOC value in a normal control state, and if the calculated predicted reach temperature of each battery tray is within the preset available temperature, the battery rack is determined to be available, and if the calculated predicted reach temperature of each battery tray exceeds the preset available temperature, the battery rack is determined to be unavailable. If it is determined that the battery rack is available, maintain an electrical connection between the battery rack and the energy storage system, and An energy storage system characterized by disconnecting the electrical connection between the battery rack and the energy storage system when it is determined that the battery rack is unavailable.
In Article 1, An energy storage system characterized in that the above cooling means is installed in each battery tray included in the battery rack.
In Article 1, The above predetermined available conditions are set based on a plurality of predetermined parameters, and An energy storage system characterized in that the above plurality of predetermined parameters include a current SOC value measured at the time of determining the above predetermined available conditions, a target SOC value of the energy storage system, a preset available temperature of the battery tray, and the current temperature of the battery.
In Paragraph 3, The above plurality of predetermined parameters are, An energy storage system characterized by further including the temperature of the location where the battery rack is installed and the humidity of the location where the battery rack is installed.
In Article 4, The above battery rack BMS is, An energy storage system characterized by comparing the current SOC value and the target SOC value to calculate the expected charge/discharge current amount of a battery rack with a failed cooling means, and calculating the predicted temperature of the battery tray included in the battery rack until the target SOC is reached within a target period based on the calculated expected charge/discharge current amount.
In Article 4, The above battery rack BMS is, An energy storage system characterized by comparing the current SOC value and the target SOC value to calculate the expected temperature rise rate of a battery rack in which the cooling means has failed, and calculating the predicted temperature reached by the battery tray included in the battery rack until the target SOC is reached within a target period based on the calculated expected temperature rise rate.
In Article 5, An energy storage system characterized in that the above-mentioned expected charge/discharge current amount is calculated through a first setting map in which the relationship between the charge/discharge current amount and one or more of the current SOC value of the battery tray or battery rack, the battery voltage value, the time to reach the target SOC value of the battery tray or battery rack, the temperature of the battery tray, the battery material, the battery capacity, and the temperature of the place where the battery rack is installed is pre-set.
In Article 6, An energy storage system characterized by the above-mentioned expected temperature rise rate being calculated through a second setting map in which the relationship between the temperature rise rate and one or more of the following is pre-set: the charge/discharge current of the battery tray, the temperature of the battery tray, the current SOC value of the battery tray, the voltage value of the battery tray, the battery material, the battery capacity, the installation location of the battery rack or battery tray, and the temperature of the location where the battery rack is installed.

Description

Energy Storage System The present invention relates to an energy storage system that predicts the availability of a battery and determines whether to operate when a malfunction occurs in a cooling device of an energy storage system. In general, temperature management of an Energy Storage System (ESS) is closely related to safety and durability. If temperature management is inadequate, durability may be reduced, and overheating of the battery may lead to damage and cause a fire. In addition, the Energy Storage System may become unusable due to battery performance designed within the battery's design temperature range. Meanwhile, the operational rate of energy storage systems is becoming increasingly important. While existing energy storage business revenue is primarily generated based on discharge volume and thus does not require mandatory operation of facilities at specific times, long-term usage contracts with entities such as the Korea Power Exchange (KPX) are becoming more common recently. Since these contracts entail penalties if the system fails to comply with dispatch instructions from the KPX, it is necessary to manage the operational rate at a high level to ensure the system can respond to such instructions at any time. An energy storage system comprises a plurality of batteries, a plurality of battery trays accommodating the plurality of batteries (including a predetermined unit concept containing batteries, such as a battery module), and a battery rack accommodating the plurality of battery trays. Each of the plurality of battery racks is equipped with a cooling means (e.g., a cooling fan) for cooling the batteries accommodated in the battery rack. As charging and discharging occur, the temperature of the batteries may rise, and the cooling system functions to cool the batteries so that their temperature does not exceed the allowable temperature of the batteries. However, in the event that a failure occurs in such a cooling means in a battery rack, conventionally, a control device of the energy storage system, such as the battery rack's BMS (BATTERY MANAGEMENT SYSTEM), detects the failure of the cooling fan and disconnects the corresponding battery rack from the energy storage system. At this time, a decrease in the operating rate of the energy storage system occurs by the amount of the disconnected battery rack. Therefore, there is a need to develop control technology to ensure the operating rate of the energy storage system even in the event of battery cooling malfunctions caused by the failure of the cooling means applied for cooling the energy storage system battery. FIG. 1 is a perspective view showing an example of an energy storage system according to one embodiment of the present invention. FIG. 2 shows a flowchart of an energy storage system including a battery availability determination step according to one embodiment of the present invention. FIG. 3 is a diagram showing specific detailed steps of a battery availability determination step according to an embodiment of the present invention. FIG. 4 is a diagram showing specific detailed steps of a battery availability determination step according to another embodiment of the present invention. Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. However, this is merely an example and the present invention is not limited thereto. In describing the present invention, detailed descriptions of known technologies related to the invention are omitted if it is determined that such descriptions may unnecessarily obscure the essence of the invention. Furthermore, the terms described below are defined considering their functions in the present invention, and these definitions may vary depending on the intentions or practices of the user or operator. Therefore, their definitions should be based on the content throughout this specification. The technical concept of the present invention is determined by the claims, and the following embodiments are merely a means to efficiently explain the technical concept of the present invention to those skilled in the art to which the present invention belongs. FIG. 1 is a perspective view showing an example of an energy storage system (1) according to an embodiment of the present invention. The energy storage system (1) in the present invention refers to an entire system for storing energy, and includes an energy storage device (100) that directly stores energy, a battery room in which the energy storage device is placed, a cooling and air conditioning device added to the battery room, and various control devices. Referring to FIG. 1, an energy storage device (100) of an energy storage system (1) which is an embodiment of the present invention may include a plurality of battery racks (101). Here, each of the plurality of battery racks (101) may include a plurality of battery trays (120) that accommodate batteries (not shown), a battery rack BMS (110) that