Search

EP-4218951-B1 - ENERGY STORAGE SYSTEM

EP4218951B1EP 4218951 B1EP4218951 B1EP 4218951B1EP-4218951-B1

Inventors

  • KANG, SUNG KOO
  • EOM, JAE PIL
  • PARK, JEONG KEUN
  • SEO, JEA WON
  • LIM, HYUNG HOON

Dates

Publication Date
20260513
Application Date
20230124

Claims (8)

  1. An energy storage system (10) comprising: a rack (100, 200) having a space inside; a plurality of modules (120_1...130_n) accommodated in the rack (100, 200) and including a plurality of battery cells arranged in one direction therein; and a sensing line (140) formed along one side of the plurality of modules (120_1...130_n); characterised in that the energy storage system (10) further comprises: a shunt resistor connected in series with the sensing line, wherein the sensing line (140) is connected between power supply and ground (GND) lines through the shunt resistor (20); and a controller (30) connected to the shunt resistor (20).
  2. The energy storage system (10) of claim 1, wherein the sensing line (140) is disposed in the same direction as one direction in which the plurality of battery cells are arranged in the plurality of modules (120_1...130_n).
  3. The energy storage system (10) of claim 1 or claim 2, wherein the sensing line (140) is arranged in alternating directions for the plurality of modules (120_1...130_n) positioned vertically in the rack (100, 200).
  4. The energy storage system (10) of any one of claims 1 to 3, wherein the sensing line (140) is configured as a constant-temperature sensing linear sensor.
  5. The energy storage system (10) of any one of claims 1 to 4, wherein the sensing line (140) has a wiring structure formed by twisting a steel wire coated with a temperature sensitive material.
  6. The energy storage system (10) of any of claims 1 to 5, wherein the controller (30) is configured to receive a voltage of both ends of the shunt resistor (20) as an input value.
  7. The energy storage system (10) of claim 6, further comprising a fire extinguishing system (40) that is connected in parallel with the controller (30) and is configured to receive a voltage of both ends of the shunt resistor (20) as an input value.
  8. The energy storage system (10) of claim 6 or 7, wherein the controller (30) or the fire extinguishing system (40) is configured to apply a control signal to spray a fire extinguishing agent to a fire extinguishing device (40) when the voltage across the shunt resistor (20) is sensed.

Description

BACKGROUND 1. Field The present disclosure relates to an energy storage system capable of accurately detecting a module where an event has occurred and injecting a fire extinguishing agent. 2. Description of the Related Art An energy storage system may be linked with a renewable energy system, such as a solar cell, and may be configured to store power when electric power demand is low and to use the stored power at a time when electric power demand is high, and refers to an apparatus including a large number of battery cells composed of secondary batteries. Generally, an energy storage system is configured such that multiple battery cells are received in multiple trays, which are received in a rack, and multiple racks are received in a container box. Meanwhile, recently, there have been cases of fires occurring in energy storage systems. Due to the nature of energy storage modules, when a fire occurs, there is a problem in that it is not easy to extinguish the fire. An energy storage module consists of a plurality of battery cells, and thus it is common to have high capacity and high output. Accordingly, a technology for increasing the safety of an energy storage module is being researched. Prior art document 1 [WO 2021025539 A1] discloses a battery pack in which the risk of secondary ignition or explosion is reduced. The battery pack comprises at least two battery modules arranged in one direction and an extinguishment unit. Prior art document 2 [WO 2021045410 A1] discloses a battery pack which reduces the risk of secondary ignition or explosion. The battery pack comprises at least two battery modules arranged in one direction and a fire extinguishing unit having a fire extinguishing tank in which a fire extinguishing agent is housed. Prior art document 3 [EP3757590 A1] discloses a circuit for detecting thermal runaway, which relates to the technical field of batteries. The circuit for detecting thermal runaway includes a sensing module including a sensing line, wherein a distance between at least a portion of the sensing line and a single battery cell in a battery set is less than a temperature-sensing distance threshold. SUMMARY The present disclosure provides an energy storage system capable of accurately detecting a module where an event has occurred and injecting a fire extinguishing agent. These and other aspects and features of the present disclosure will be described in or will be apparent from the following description of embodiments of the present disclosure. The invention is set out in the appended set of claims. An energy storage system according to the invention includes: a rack having a space inside; a plurality of modules accommodated in the rack and including a plurality of battery cells arranged in one direction therein; and a sensing line formed along one side of the plurality of modules, respectively. Here, the sensing line may be disposed in the same direction as one direction in which the plurality of battery cells are arranged in the plurality of modules. In addition, the sensing line may be arranged in alternating directions for the plurality of modules positioned vertically in the rack. In addition, the sensing line may be configured as a constant-temperature sensing linear sensor. In addition, the sensing line may have a wiring structure formed by twisting a steel wire coated with a temperature sensitive material. According to the invention, power and ground lines are connected to both ends of the sensing line. According to the invention, a shunt resistor connected in series with the sensing line exists between the power and ground lines, and a controller connected to the shunt resistor is further provided. In addition, the controller may receive (e.g. may be configured to receive) a voltage of both ends of the shunt resistor as an input value. In addition, a fire extinguishing system that is connected in parallel with the controller and receives (e.g. may be configured to receive) a voltage of both ends of the shunt resistor as an input value may be further included. In addition, the controller or the fire extinguishing system may apply (e.g. may be configured to apply) a control signal to spray a fire extinguishing agent to the fire extinguishing device when the voltage across the shunt resistor is sensed. At least some of the above and other features of the invention are set out in the claims. BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a perspective view showing the configuration of a rack in an energy storage system according to an embodiment of the present invention.FIG. 2 is a conceptual diagram illustrating a method for installing a sensing line at a lower end of a rack in an energy storage system according to an embodiment of the present invention.FIG. 3 is a structural diagram illustrating a sensing line used in an energy storage system according to an embodiment of the present invention.FIGS. 4A and 4B are conceptual diagrams illustrating operations when an event occurs in a