Energy storage system

Abstract

According to some embodiments of the present disclosure, an energy storage system is disclosed. The energy storage system may comprise: a first battery pack; a first power conditioning system (PCS) for managing charging / discharging of the first battery pack; a second battery pack; a second PCS for managing charging / discharging of the second battery pack; a power management system (PMS) for monitoring the state of each of the first battery pack and the second battery pack, and controlling the first PCS and the second PCS on the basis of the monitoring result; and an energy supplier for supplying power to the first battery pack and the second battery pack.

Description

Energy storage system

[0001] The present disclosure relates to an energy storage system, and more particularly, to a method for operating an energy storage system capable of managing maximum operating efficiency.

[0002] An Energy Storage System (ESS) can be a device that stores electricity generated at a power plant and then supplies the stored power to where it's needed. An ESS may include multiple batteries to store electricity. It may also include components such as a Power Conditioning System (PCS), Energy Management System (EMS), or Battery Management System (BMS) to manage these batteries.

[0003] As demand for electricity grows year after year due to industrial development, the amount of electricity consumed by consumers is also on the rise. However, even with this growing demand, it can be difficult to immediately increase power generation facilities. To address this, ESS can be deployed in residential complexes or industrial facilities to supply power.

[0004] As mentioned above, ESS does not immediately deliver power generated at power plants to consumers. Instead, it stores the generated power in batteries and then supplies it where needed. However, because ESS batteries can only be charged or discharged in one direction, the problem arises: charging is impossible while the battery is discharging, and conversely, discharging is impossible while the battery is charging. Consequently, the operational efficiency of ESS is reduced.

[0005] The present disclosure has been conceived in response to the aforementioned background technology, and aims to provide an energy storage system capable of managing maximum operating efficiency.

[0006] The technical problems of the present disclosure are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the description below.

[0007] According to one embodiment of the present disclosure for solving the above-described problem, an energy storage system is disclosed. The energy storage system includes: a first battery pack; a first power conditioning system (PCS) for managing charging and discharging of the first battery pack; a second battery pack; a second PCS for managing charging and discharging of the second battery pack; a power management system (PMS) for monitoring the states of each of the first battery pack and the second battery pack and controlling the first PCS and the second PCS based on the monitoring results; and an energy supplier for supplying power to the first battery pack and the second battery pack; wherein, when a discharge resource is connected to the energy storage system, the PMS controls the first PCS or the second PCS so that power is supplied to the discharge resource through one of the first battery pack and the second battery pack, and controls the first PCS or the second PCS so that charging is performed on a battery pack other than the one of the first and second battery packs.

[0008] Additionally, the PMS can control the first PCS and the second PCS based on the first SOC (State Of Charge) of the first battery pack, the temperature of the first battery pack, the second SOC of the second battery pack, the temperature of the second battery pack, and the difference value between the first SOC and the second SOC.

[0009] In addition, the PMS may determine a first SOC of the first battery pack and a second SOC of the second battery pack when a discharge resource is connected to the energy storage system, and, when it is determined that the first SOC has a larger value than the second SOC, control the first PCS to supply power to the discharge resource through the first battery pack, and control the second PCS to cause charging of the second battery pack to be performed by the energy supplier.

[0010] In addition, the PMS may control the second PCS to supply power to the discharge resource through the second battery pack, and control the first PCS to perform charging of the first battery pack by the energy supplier, if it is determined that the first SOC has a value smaller than a preset first threshold value compared to the second SOC based on the monitoring results of the first SOC and the second SOC.

[0011] Additionally, the PMS can control the first PCS and the second PCS so that charging of the first battery pack and the second battery pack is performed by the energy supplier when the discharge resource is disconnected.

[0012] In addition, the PMS may determine the first SOC and the second SOC when the connection of the discharge resource is disconnected, and if the first SOC is less than a preset second threshold, control the first PCS so that charging of the first battery pack is performed by the energy supplier, determine whether the second SOC is less than or equal to the second threshold when the first SOC is greater than or equal to the second threshold, and if the second SOC is less than the second threshold, control the second PCS so that charging of the second battery pack is performed by the energy supplier, and if the second SOC is greater than or equal to the second threshold, control the first PCS and the second PCS so that charging of the first battery pack and the second battery pack is performed by the energy supplier.

[0013] In addition, the PMS may determine a first temperature of the first battery pack and a second temperature of the second battery pack when a discharge resource is connected to the energy storage system, and, when the first temperature is equal to or higher than a preset third threshold, control the second PCS to supply power to the discharge resource through the second battery pack, and, when the first temperature is lower than the third threshold, control the first PCS to cause charging of the first battery pack by the energy supplier.

[0014] The technical solutions obtainable in the present disclosure are not limited to the solutions mentioned above, and other solutions not mentioned will be clearly understood by a person having ordinary skill in the art to which the present disclosure pertains from the description below.

[0015] According to some embodiments of the present disclosure, an energy storage system capable of managing maximum driving efficiency can be provided by efficiently performing charging and discharging of a battery.

[0016] The effects that can be obtained from the present disclosure are not limited to the effects mentioned above, and other effects that are not mentioned will be clearly understood by a person having ordinary skill in the art to which the present disclosure pertains from the description below.

[0017] Various aspects are now described with reference to the drawings, wherein like reference numerals are used to refer to similar elements throughout. In the following examples, for purposes of explanation, numerous specific details are set forth to provide a thorough understanding of one or more aspects. However, it will be apparent that such aspects may be practiced without these specific details. In other instances, well-known structures and devices are shown in block diagram form to facilitate the description of one or more aspects.

[0018] FIG. 1 illustrates an exemplary system for describing an example of an energy storage system according to some embodiments of the present disclosure.

[0019] FIG. 2 is a flowchart illustrating an example of the operation of an energy storage system according to some embodiments of the present disclosure.

[0020] FIG. 3 is a flowchart illustrating another example of the operation of an energy storage system according to some embodiments of the present disclosure.

[0021] FIG. 4 is a flowchart illustrating another example of the operation of an energy storage system according to some embodiments of the present disclosure.

[0022] FIG. 5 is a diagram illustrating an example of a case where a discharge resource is not connected to an energy storage system according to some embodiments of the present disclosure.

[0023] FIG. 6 is a diagram illustrating an example of a case where a discharge resource is connected to an energy storage system according to some embodiments of the present disclosure.

[0024] FIG. 7 is a drawing for explaining an example of a case where the operations of the first PCS and the second PCS are switched according to some embodiments of the present disclosure.

[0025] FIG. 8 is a drawing for explaining an example of a case where the operations of the first PCS and the second PCS are switched according to some embodiments of the present disclosure.

[0026] FIG. 9 is a diagram illustrating an example of a case where a discharge resource is disconnected according to some embodiments of the present disclosure.

[0027] The present invention is susceptible to various modifications and embodiments. Specific embodiments are illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, but rather to encompass all modifications, equivalents, and alternatives falling within the spirit and technical scope of the present invention. Throughout the description of each drawing, similar reference numerals have been used to designate similar components.

[0028] Terms such as "first," "second," "A," and "B" may be used to describe various components, but the components should not be limited by these terms. These terms are used solely to distinguish one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as the "second component," and similarly, the second component may also be referred to as the "first component." The term "and / or" includes a combination of a plurality of related items described herein or any of a plurality of related items described herein.

[0029] When a component is referred to as being "connected" or "connected" to another component, it should be understood that it may be directly connected or connected to that other component, but that there may be other components intervening. Conversely, when a component is referred to as being "directly connected" or "connected" to another component, it should be understood that there are no other components intervening.

[0030] The terminology used in this application is only used to describe specific embodiments and is not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this application, it should be understood that the terms "comprise" or "have" indicate the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification, but do not preclude the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0031] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined herein.

[0032] In the present disclosure, an energy storage system may include a plurality of battery packs. For example, the energy storage system may include a first battery pack, a second battery pack, and an Nth battery pack. That is, the energy storage system may include a plurality of battery packs. For convenience of explanation, only the first battery pack and the second battery pack will be described below. The energy storage system may charge the first battery pack and the second battery pack through an energy supplier. The energy supplier may be a device or institution that supplies power, such as a solar power system or a power plant. The energy storage system may supply power to a discharge resource through the first battery pack when a discharge resource is connected. The discharge resource may be a device that requires charging, such as an electric vehicle. When supplying power to the discharge resource through the first battery pack, the energy storage system may charge the second battery pack. When the State Of Charge (SOC) of the first battery pack decreases below a certain level, the energy storage system may supply power to the discharge resource through the second battery pack. Additionally, the energy storage system can charge the first battery pack. Accordingly, the energy storage system can efficiently charge and discharge the battery pack.

[0033] Hereinafter, an energy storage system according to the present disclosure will be described with reference to FIGS. 1 to 9.

[0034] FIG. 1 illustrates an exemplary system for describing an example of an energy storage system according to some embodiments of the present disclosure.

[0035] Referring to FIG. 1, an energy storage system (ESS) (100) may include a power management system (PMS) (110), a first power conditioning system (PCS) (120), a first battery pack (121), a second PCS (130), and a second battery pack (131). However, the above-described components are not essential for implementing the energy storage system (100), and thus, the energy storage system (100) may have more or fewer components than the components listed above.

[0036] An energy storage system (100) may be a device that stores generated power and allows it to be withdrawn and used when power is needed. The energy storage system (100) may store power through a plurality of battery packs. For example, the energy storage system (100) may store power through a first battery pack (121), a second battery pack (122), and an Nth battery pack.

[0037] The PMS (110) can typically process the overall operation of the energy storage system (100). The PMS (110) can process signals, data, information, etc. input or output through components of the energy storage system (100).

[0038] The PMS (110) may be composed of one or more cores and may include a processor for data analysis, such as a central processing unit (CPU), a general purpose graphics processing unit (GPGPU), or a tensor processing unit (TPU).

[0039] In the present disclosure, the PMS (110) can monitor the status of each of the first battery pack (121) and the second battery pack (131). The PMS (110) can monitor the status of the first battery pack (121) and the second battery pack (131) through communication such as CAN or Modbus. The PMS (110) can control the first PCS (120) and the second PCS (130) based on the monitoring results.

[0040] In the present disclosure, when a discharge resource (300) is connected to an energy storage system (100), the PMS (110) can control the first PCS (120) or the second PCS (130) so that power is supplied to the discharge resource (300) through either the first battery pack (121) or the second battery pack (131). In addition, the PMS (110) can control the first PCS (120) or the second PCS (130) so that charging is performed on a battery pack other than the one battery pack.

[0041] According to one embodiment, the PMS (110) can control the first PCS (120) and the second PCS (130) based on the first SOC (State Of Charge) of the first battery pack (121), the temperature of the first battery pack (121), the second SOC of the second battery pack (131), the temperature of the second battery pack (131), and the difference between the first SOC and the second SOC. Here, the SOC (State Of Charge) can be understood as the charge amount of the battery. Hereinafter, an example of a method in which the PMS (110) controls the first PCS (120) and the second PCS (130) will be described with reference to FIGS. 2 to 9.

[0042] The first PCS (120) can manage the charging and discharging of the first battery pack (121). The first PCS (120) can manage the first battery pack (121) so that the first battery pack (121) is charged or discharged under the control of the PMS (110).

[0043] The second PCS (130) can manage the charging and discharging of the second battery pack (131). The second PCS (130) can manage the second battery pack (131) so that the first battery pack (121) is charged or discharged under the control of the PMS (110).

[0044] The energy supplier (200) may be a facility or device that supplies energy to the energy storage system (100). For example, the energy supplier (200) may be a power plant or a solar power plant. The energy supplier (200) may supply the generated power to the energy storage system (100).

[0045] The discharge resource (300) may be a resource that receives power from the energy storage system (100). For example, the discharge resource (300) may be an electric vehicle that charges power using the energy storage system (100).

[0046] Below, an example of how an energy storage system (100) manages charging and discharging of battery packs is described.

[0047] FIG. 2 is a flowchart illustrating an example of the operation of an energy storage system according to some embodiments of the present disclosure.

[0048] Referring to FIG. 2, the PMS (110) of the energy storage system (100) can determine the first SOC of the first battery pack (121) and the second SOC of the second battery pack (131) when a discharge resource (300) is connected to the energy storage system (100) (S110).

[0049] If the PMS (110) determines that the first SOC has a larger value than the second SOC (S120, Yes), the PMS (110) can control the first PCS (120) to supply power to the discharge resource (300) through the first battery pack (121) (S120).

[0050] In other words, if the PMS (110) determines that the charge amount of the first battery pack (121) is greater than the charge amount of the second battery pack (131), the PMS (110) can control the first battery pack (121) to be discharged through the first PCS (120).

[0051] The PMS (110) can control the second PCS (130) so that charging of the second battery pack (131) is performed by the energy supplier (200) (S130).

[0052] In other words, the PMS (110) can control the first battery pack (121) to be discharged through the first PCS (120) and control the second battery pack (131) to be charged through the second PCS (130).

[0053] If it is not determined that the first SOC has a larger value than the second SOC (S120, No), the PMS (110) can control the second PCS (130) to supply power to the discharge resource (300) through the second battery pack (131) (S150). If it is determined that the charge amount of the first battery pack (121) is less than the charge amount of the second battery pack (131), the PMS (110) can control the second battery pack (131) to be discharged through the second PCS (130).

[0054] In addition, the PMS (110) can control the first PCS (120) so that the first battery pack (121) is charged by the energy supplier (200) (S160). The PMS (110) can control the second battery pack (131) to be discharged through the second PCS (130) and control the first battery pack (121) to be charged through the first PCS (120).

[0055] According to some embodiments of the present disclosure, if the first SOC and the second SOC are determined to be the same, the PMS (110) may determine the battery pack that has not most recently performed a discharge as the battery pack to supply power to the discharge resource (300). In other words, if power was most recently supplied to the previous discharge resource through the first battery pack (121), the PMS (110) may supply power to the discharge resource (300) through the second battery pack (131).

[0056] According to some embodiments of the present disclosure, when a discharge resource is connected to the energy storage system (100), the PMS (110) can determine a first temperature of the first battery pack (121) and a second temperature of the second battery pack (122). When the first temperature is equal to or greater than a preset third threshold, the PMS (110) can control the second PCS (130) to supply power to the discharge resource through the second battery pack (131). The preset third threshold can be, for example, 75° C. And, when the first temperature is less than the third threshold, the PMS (110) can control the first PCS (120) to cause charging of the first battery pack (121) by the energy supplier (200).

[0057] According to the above-described configuration, the energy storage system (100) can simultaneously perform charging and discharging through multiple battery packs. Accordingly, the operating efficiency of the energy supply system (100) can be increased.

[0058] Meanwhile, according to some embodiments of the present disclosure, when the energy storage system (100) supplies power to the discharge resource (300), it can monitor the SOC of the first battery pack (121) and the second battery pack (122). In addition, the energy storage system (100) can switch the operation of the battery pack performing charging and the battery pack performing discharging based on the SOC of the battery pack supplying power to the discharge resource. Hereinafter, another example of the operation of the energy storage system (100) according to the present disclosure will be described with reference to FIG. 3.

[0059] FIG. 3 is a flowchart illustrating another example of the operation of an energy storage system according to some embodiments of the present disclosure.

[0060] FIG. 3 is a flowchart for explaining a state in which the PMS (110) of the energy storage system (100) controls the first PCS (120) so that power is supplied to a discharge resource (300) through the first battery pack (121), and controls the second PCS (130) so that charging of the second battery pack (131) is performed by the energy supplier (200).

[0061] Referring to FIG. 3, the PMS (110) of the energy storage system (100) can perform monitoring of the first SOC and the second SOC (S141).

[0062] Based on the monitoring results of the first SOC and the second SOC, if it is determined that the first SOC has a value smaller than the second SOC by a preset first threshold value (S142, Yes), the PMS (110) can control the second PCS (130) so that power is supplied to the discharge resource (300) through the second battery pack (131). In addition, the PMS (110) can control the first PCS (120) so that charging of the first battery pack (121) is performed by the energy supplier (200).

[0063] For example, the preset first threshold value may be assumed to be 30%. If the PMS (110) determines that the first SOC has a value that is 30% or more lower than the second SOC, the PMS (110) may control the second PCS (130) to supply power to the discharge resource (300) through the second battery pack (131). However, the first threshold value is not limited to 30%.

[0064] For example, let's assume that the first SOC is 30% and the second SOC is 70%. In this case, the PMS (110) can control the second PCS (130) so that power is supplied to the discharge resource (300) through the second battery pack (131).

[0065] If it is not determined that the first SOC has a value smaller than the preset first threshold value compared to the second SOC (S142, No), the PMS (110) can control the first PCS (120) to supply power to the discharge resource (300) through the first battery pack (121). In addition, the PMS (110) can control the first PCS (130) to allow charging of the second battery pack (131) to be performed by the energy supplier (200).

[0066] For example, the PMS (110) can maintain the supply of power through the first battery pack (121) if it is determined that the first SOC does not have a value that is more than 30% lower than the second SOC.

[0067] For example, let's assume that the first SOC is 50% and the second SOC is 70%. In this case, the PMS (110) can control the first PCS (120) so that the supply of power is maintained through the first battery pack (121).

[0068] According to the above-described configuration, the energy storage system (100) can monitor the SOC of multiple battery packs when supplying power to the discharge resource (300). In addition, the energy storage system (100) can switch the operations of the two batteries when the difference between the SOC of the battery pack supplying power to the discharge resource (300) and the SOC of another battery pack is greater than or equal to a threshold value. In other words, the energy storage system (100) can charge the battery pack supplying power to the discharge resource (300) and then supply power to the discharge resource (300) using the other battery pack that was being charged. Accordingly, the operating efficiency of the energy supply system (100) can be increased.

[0069] Meanwhile, according to some embodiments of the present disclosure, the PMS (110) of the energy supply system (100) can control the first PCS (120) and the second PCS (130) so that the charging of the first battery pack (121) and the second battery pack (131) is performed by the energy supplier (200) when the connection of the discharge resource (300) is disconnected. In this case, the PMS (110) can determine the battery pack to be charged first based on the first SOC and the second SOC. Hereinafter, another example of the operation of the energy storage system (100) according to the present disclosure will be described with reference to FIG. 4.

[0070] FIG. 4 is a flowchart illustrating another example of the operation of an energy storage system according to some embodiments of the present disclosure.

[0071] FIG. 4 is a flowchart for explaining a state in which the connection of the discharge resource (300) is disconnected after the PMS (110) of the energy storage system (100) controls the first PCS (120) to supply power to the discharge resource (300) through the first battery pack (121).

[0072] Referring to FIG. 4, the PMS (110) of the energy storage system (100) can determine the first SOC and the second SOC when the discharge resource (300) is disconnected (S210).

[0073] If the first SOC is less than the preset second threshold value (S220, Yes), the PMS (110) can control the first PCS (120) to allow charging of the first battery pack (121) by the energy supplier (200) (S230).

[0074] For example, the preset second threshold may be assumed to be 20%. When the charge level of the first battery pack (121) is less than 20%, the PMS (110) may control the first PCS (120) to charge the first battery pack (121) through the energy supplier (200). However, the second threshold is not limited to 20%.

[0075] According to one embodiment, the PMS (110) can monitor the first SOC of the first battery pack (121) when charging of the first battery pack (121) is performed. In addition, the PMS (110) can control the first PCS (120) and the second PCS (130) so that charging of the first battery pack (121) and the second battery pack (131) is performed by the energy supplier (200) when the first SOC is equal to or higher than the second threshold value.

[0076] For example, when the PMS (110) determines that the first SOC has entered a range of 20% or more while monitoring the first SOC, the PMS (110) can control the first PCS (120) and the first PCS (130) so that charging of the first battery pack (121) and the second battery pack (131) is performed by the energy supplier (200).

[0077] If the first SOC is greater than or equal to the second threshold (S220, No), the PMS (110) can determine whether the second SOC is less than the second threshold.

[0078] For example, the PMS (110) can determine whether the second SOC is less than the second threshold value when the first SOC is greater than or equal to 20%.

[0079] If the second SOC is less than the second threshold value (S240, Yes), the PMS (110) can control the second PCS (130) so that charging of the second battery pack (131) is performed by the energy supplier (200) (S250).

[0080] For example, when the charge level of the second battery pack (131) is less than 20%, the PMS (110) can control the second PCS (130) to perform charging of the second battery pack (131) through the energy supplier (200).

[0081] According to one embodiment, the PMS (110) can monitor the second SOC of the second battery pack (131) when charging of the second battery pack (131) is performed. In addition, the PMS (110) can control the first PCS (120) and the first PCS (130) so that charging of the first battery pack (121) and the second battery pack (131) is performed by the energy supplier (200) when the second SOC is equal to or higher than the second threshold.

[0082] If the second SOC is greater than or equal to the second threshold value (S240, No), the PMS (110) can control the first PCS (120) and the second PCS (130) so that charging of the first battery pack (121) and the second battery pack (131) is performed by the energy supplier (200) (S260).

[0083] In other words, the PMS (110) can simultaneously perform charging for the first battery pack (121) and the second battery pack (131) when the SOC of each of the first battery pack (121) and the second battery pack (131) is equal to or higher than the second threshold value.

[0084] According to the above-described configuration, the energy storage system (100) can determine which battery pack to charge first based on the first SOC and the second SOC when the discharge resource (300) is disconnected. This may be because, when two battery packs are charged simultaneously, each battery pack is charged slowly. In addition, when two battery packs are charged simultaneously, the difference in the SOC of each of the two battery packs may not change. In this case, a situation may occur where only one battery continues to be charged, which may be a factor that deteriorates the performance of the battery. Therefore, the energy storage system (100) can determine which battery pack to charge first based on the first SOC and the second SOC so that the SOCs of the two battery packs can be maintained similarly. Hereinafter, the charge and discharge operation of the energy operation system (100) described above will be described through a schematic diagram.

[0085] FIG. 5 is a diagram illustrating an example of a case where a discharge resource is not connected to an energy storage system according to some embodiments of the present disclosure. FIG. 6 is a diagram illustrating an example of a case where a discharge resource is connected to an energy storage system according to some embodiments of the present disclosure. FIG. 7 and FIG. 8 are diagrams illustrating an example of a case where the operations of a first PCS and a second PCS are switched according to some embodiments of the present disclosure. FIG. 9 is a diagram illustrating an example of a case where a discharge resource is disconnected according to some embodiments of the present disclosure.

[0086] Referring to FIG. 5, the energy storage system (100) may include a PMS (110), a first PCS (120), a first battery pack (121), a second PCS (130), and a second battery pack (131). When there is no discharge resource, the PMS (110) of the energy storage system (100) may control the first PCS (120) and the second PCS (130) so that charging of the first battery pack (121) and the second battery pack (122) is performed by the energy supplier (200). The first SOC of the first battery pack (121) and the second SOC of the second battery pack (131) in FIG. 5 may be the same 40%.

[0087] Referring to FIG. 6, the PMS (110) can control the first PCS (120) to supply power to the discharge resource (300) through the first battery pack (121). The PMS (110) can control the second PCS (130) to charge the second battery pack (131) through the energy supplier (200). Since the first SOC and the second SOC in FIG. 6 are the same, the PMS (110) can determine any battery pack as the battery pack to supply power to the discharge resource (300).

[0088] Referring to FIG. 7, it can be confirmed that the first SOC has decreased, while the second SOC has been further charged. Accordingly, the PMS (110) can control the second PCS (130) to supply power to the discharge resource (300) through the second battery pack (131). The PMS (110) can control the first PCS (120) to charge the first battery pack (121) through the energy supplier (200).

[0089] Referring to FIG. 8, it can be confirmed that the first SOC and the second SOC are similar as the PMS (110) supplies power to the discharge resource (300) through the second battery pack (131) and charges the first battery pack (121) through the energy supplier (200).

[0090] Referring to FIG. 9, as the discharge resource (300) is disconnected, the PMS (110) can control the first PCS (120) and the second PCS (130) so that charging of the first battery pack (121) and the second battery pack (122) is performed by the energy supplier (200).

[0091] The description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other embodiments without departing from the scope of the present disclosure. Therefore, the present disclosure is not intended to be limited to the embodiments disclosed herein, but is to be construed in the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. As an energy storage system, 1st battery pack; A first PCS (Power Conditioning System) that manages charging and discharging of the first battery pack; Second battery pack; A second PCS for managing charging and discharging of the second battery pack; A PMS (Power Management System) that monitors the status of each of the first battery pack and the second battery pack and controls the first PCS and the second PCS based on the monitoring results; and An energy supplier supplying power to the first battery pack and the second battery pack; Including, The above PMS is, When a discharge resource is connected to the energy storage system, the first PCS or the second PCS is controlled so that power is supplied to the discharge resource through one of the first battery pack or the second battery pack, and the first PCS or the second PCS is controlled so that charging is performed on a battery pack other than the one of the first battery packs. Energy storage system.

2. In paragraph 1, The above PMS is, Controlling the first PCS and the second PCS based on the first SOC (State Of Charge) of the first battery pack, the temperature of the first battery pack, the second SOC of the second battery pack, the temperature of the second battery pack, and the difference value between the first SOC and the second SOC. Energy storage system.

3. In paragraph 1, The above PMS is, When a discharge resource is connected to the energy storage system, the first SOC of the first battery pack and the second SOC of the second battery pack are determined, If it is determined that the first SOC has a larger value than the second SOC, the first PCS is controlled so that power is supplied to the discharge resource through the first battery pack, and Controlling the second PCS so that charging of the second battery pack is performed by the energy supplier; Energy storage system.

4. In paragraph 3, The above PMS is, Based on the monitoring results of the first SOC and the second SOC, if it is determined that the first SOC has a value smaller than a preset first threshold value compared to the second SOC, the second PCS is controlled so that power is supplied to the discharge resource through the second battery pack, and Controlling the first PCS so that charging of the first battery pack is performed by the energy supplier; Energy storage system.

5. In paragraph 3, The above PMS is, When the connection of the discharge resource is disconnected, controlling the first PCS and the second PCS so that charging of the first battery pack and the second battery pack is performed by the energy supplier. Energy storage system.

6. In paragraph 3, The above PMS is, When the connection of the above discharge resource is disconnected, the first SOC and the second SOC are determined, When the first SOC is less than a preset second threshold, the first PCS is controlled so that charging of the first battery pack is performed by the energy supplier; If the first SOC is greater than or equal to the second threshold, determine whether the second SOC is less than or equal to the second threshold; When the second SOC is less than the second threshold, the second PCS is controlled so that charging of the second battery pack is performed by the energy supplier, and When the second SOC is equal to or greater than the second threshold value, controlling the first PCS and the second PCS so that charging of the first battery pack and the second battery pack is performed by the energy supplier. Energy storage system.

7. In paragraph 1, The above PMS is, When a discharge resource is connected to the energy storage system, a first temperature of the first battery pack and a second temperature of the second battery pack are determined, When the first temperature is higher than a preset third threshold, the second PCS is controlled to supply power to the discharge resource through the second battery pack, and When the first temperature is lower than the third threshold value, controlling the first PCS so that charging of the first battery pack is performed by the energy supplier. Energy storage system.

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