KR20200059736A - Energy storage apparatus using the used battery of electric vehicle and method for storaging the same - Google Patents

Abstract

According to an embodiment of the present invention, provided is an energy storage device using a renewable battery which can recycle batteries and, more specifically, provided is an energy storage device using a renewable battery, and comprising: a battery rack in which a plurality of renewable batteries are connected in parallel; a power converting part which includes a low-voltage inverter connected to the battery rack; and a power management part which controls charging or discharging of power in the battery rack.

Description

Energy storage device and storage method using battery for electric vehicle {ENERGY STORAGE APPARATUS USING THE USED BATTERY OF ELECTRIC VEHICLE AND METHOD FOR STORAGING THE SAME}

The present invention relates to an energy storage system (ESS) and an energy storage method using a battery for an electric vehicle, and more specifically, to identify characteristics of a battery for an electric vehicle with a life remaining, and to use a battery for charging the energy storage device. It relates to an energy storage device for renewable linkage to be used.

Generally, a battery means charging electrical energy with chemical energy and discharging charged chemical energy with electrical energy.

A significant portion of the price of an energy storage device (ESS) is occupied by the battery, and thus the price and management of the battery is a very important factor in the design of the ESS. Therefore, in recent years, research on an energy storage device using a recycled battery in which a waste battery is recycled has been actively conducted.

Batteries for electric vehicles have high economic value because they can extract lithium and polymer even after the end of the battery's life, and can be used for ESS (for energy storage).

After the development of electric vehicles, as the spread of electric vehicles has increased, tens of thousands of batteries for electric vehicles with remaining life remaining are pouring out every year. Generally, electric vehicles use lithium-ion batteries, which are designed to charge / discharge about 6000 times. However, on average, there are many electric vehicles that are discarded after charging / discharging about 1000 to 2000 times, so the battery for the electric vehicle can be recycled. However, the state of health (SOH) and the internal resistance of the battery vary depending on the use environment (temperature or shock, etc.), and thus there is a problem in that recycling of the battery is difficult.

As described above, in the ESS using the recycled battery, there is an advantage of lowering the price of the battery, but it is difficult to manage the battery and has a disadvantage of low stability and reliability of service.

An object of the present invention for improving the above disadvantages is to provide an energy storage system and an energy storage method for recycling a battery through an ESS using a renewable battery.

In addition, it is possible to provide an energy storage system and an energy storage method that can utilize a battery for an electric vehicle having different SOH and internal resistance of a battery in an ESS.

An energy storage device using a renewable battery according to an embodiment of the present invention includes a battery rack in which a plurality of renewable batteries are connected in parallel, a power converter including a low voltage inverter connected to the battery rack, and power to the battery rack It may include a power management unit for controlling the charge or discharge of.

According to an embodiment of the present invention, a battery management unit configured to grasp the characteristics of the renewable battery and control charging and discharging between the battery rack and the battery cells of the renewable battery may be further included.

According to one embodiment, the battery rack may be configured to facilitate the adjustment of the regenerative battery.

According to one embodiment, the battery rack may be compatible with renewable batteries having different internal resistances.

According to one embodiment, the low-voltage inverter may include a DC-DC converter.

According to one embodiment, the low-voltage inverter may convert a DC power supply of a voltage of 200V or more and 400V or less into AC power.

According to one embodiment, the renewable battery may include a lithium ion battery for an electric vehicle with a remaining life.

The disclosed technology can have the following effects. However, since the specific embodiment does not mean that all of the following effects should be included or only the following effects are included, the scope of rights of the disclosed technology should not be understood as being limited thereby.

According to the energy storage device and the energy storage method using a renewable battery according to an embodiment of the present invention, it is possible to recycle the battery for an electric vehicle generated by tens of thousands of batteries annually, thereby enabling battery recycling through ESS using the renewable battery.

In particular, according to the energy storage device and the energy storage method using a renewable battery according to an embodiment of the present invention, there is an effect that can utilize the battery for electric vehicles having different SOH and internal resistance of the battery in the ESS.

1 is a block diagram illustrating an energy storage device using a renewable battery according to an embodiment of the present invention.
2 is a diagram for comparing and explaining a battery connection in an energy storage device using a renewable battery according to an embodiment of the present invention.
3 is a view for explaining the connection of a conventional energy storage device battery in more detail.
4 is a view for explaining in more detail the battery connection in the energy storage device using a renewable battery according to an embodiment of the present invention.
5 is a view for explaining the configuration of the inverter of the power management unit in the energy storage device using a renewable battery according to an embodiment of the present invention.
6 is a block diagram illustrating an operation of a battery management unit in an energy storage device using a renewable battery according to an embodiment of the present invention.

The present invention can be applied to various changes and can have various embodiments, and specific embodiments will be 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, and should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

In describing each drawing, similar reference numerals are used for similar components. Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from other components.

For example, the first component may be referred to as a second component without departing from the scope of the present invention, and similarly, the second component may be referred to as a first component. The term "and / or" includes a combination of a plurality of related described items or any one of a plurality of related described items.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person skilled in the art to which the present invention pertains.

Terms such as those defined in a commonly used dictionary should be interpreted as having meanings consistent with meanings in the context of related technologies, and should not be interpreted as ideal or excessively formal meanings unless explicitly defined in the present application. Should not.

Hereinafter, a method and apparatus for evaluating the abnormality of facility data according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram illustrating an energy storage device using a renewable battery according to an embodiment of the present invention.

Referring to FIG. 1, the energy storage device 100 using a renewable battery includes a power conversion unit 110 (PCS; Power Conditioning System), a power management unit 120 (PMS), and a battery unit 130. You can. Here, the battery unit 130 may include a plurality of battery racks, such as a first battery rack 131, a second battery rack 132, and a third battery rack 133.

The energy storage device 100 using a renewable battery according to an embodiment of the present invention includes a battery unit 130 including a battery rack in which a plurality of renewable batteries are connected in parallel and a low voltage inverter connected to the battery rack. It may include a power conversion unit 110 and a power management unit 120 for controlling charging or discharging of power in the battery rack.

According to an embodiment of the present invention, a battery management unit configured to grasp the characteristics of the renewable battery and control charging and discharging between the battery rack and the battery cells of the renewable battery may be further included. The detailed description of the battery management unit will be given in FIG. 6.

According to an embodiment, the power converter 110 may include a low voltage inverter as a power converter. Since the energy storage device stores electricity as a direct current when storing electricity in a battery, and uses electricity as an alternating current in a power system, it is important to convert AC power to DC power and DC power to AC power. The power converter 110 may serve to convert the direct current stored in the battery into alternating current to supply the power system, or to convert the alternating current received from the power system into direct current to store in the battery. In this case, the power conversion unit 110 may be directly connected to the battery unit, or may be connected through the power management unit 120 as shown in FIG. 1.

According to one embodiment, the power converter 110 may control the quality of the active power and the reactive power of the energy storage device and measure the voltage. In addition, it is possible to monitor the connection status and the operation status between the configuration modules of the energy storage device. In addition, the entire system of the energy storage device can be protected from a power outage, and the quality of stored power can be controlled.

Among the weight of the renewable energy supply certificate (REC), the power weight of the energy storage device connected to the solar power plant and the energy storage device connected to the wind power is 5.0 and 4.5, respectively, which is higher than other energy. According to one embodiment, the power converter 110 may control the generation, profit reduction, peak reduction, frequency control and battery compatibility, expansion and exchange of the solar and wind energy storage devices.

According to an embodiment, the power management unit 120 may transmit information necessary for control of energy charging / discharging to the power conversion unit 110. For example, it is possible to control normal operation of the energy storage device 100 using a renewable battery by receiving information on the charging information of the battery, the voltage, current and temperature of the battery cell, and the like.

According to an embodiment, the power management unit 120 may command the charge / discharge or on / off signal of the battery to the power conversion unit 110 and control the entire energy storage device 100 using the renewable battery.

 According to an embodiment, the power management unit 120 may control to supply the power of the battery to the power system during the daytime by charging the late night power to the battery. According to another embodiment, the power management unit 120 may control to reduce electricity bills by controlling the use of power in a time period when the power is most expensive.

According to an embodiment, a plurality of battery racks, such as the first battery rack 131, the second battery rack 132, and the third battery rack 133, may be arranged in parallel.

The battery included in the battery rack of the battery unit 130 may be a recycled battery discarded after being used in an electric vehicle. At this time, the battery can be any secondary battery that can be charged, and preferably includes a lithium ion battery.

Batteries used in electric vehicles generally use lithium ion batteries. In general, the lithium theory battery is designed to have a charge / discharge life of 6000 times. However, in the case of an electric vehicle, on average, after charging / discharging between 1000 and 2000 times, it becomes a junk car, and a waste battery with much remaining life can be used as a recycled battery.

According to the prior art, since the energy storage device uses a series connection of batteries, only batteries having the same internal resistance as the state of health (SOH) could be used. According to an embodiment of the present invention, the battery unit 130 connects the electric vehicle batteries of 200 to 300V in parallel, and allows the batteries of the battery racks 131, 132, and 133 to be detached, respectively, to reach the end of life. Can be designed so that it can be replaced with another renewable battery.

According to one embodiment, the battery rack may be configured to facilitate adding and subtracting of the recycled battery. At this time, since the renewable batteries constituting the battery rack are connected in parallel to each other, there is no problem in the operation of the energy storage device even if the batteries are added or reduced.

According to one embodiment, the battery rack may be compatible with renewable batteries having different internal resistances.

According to one embodiment, the renewable battery may include a lithium ion battery for an electric vehicle with a remaining life.

FIG. 2 is a diagram for comparing and explaining a battery connection in a conventional energy storage device battery connection and an energy storage device using a renewable battery according to an embodiment of the present invention.

Referring to Figure 2 (a), it can be seen that the conventional energy storage device battery connection. The conventional battery unit includes battery racks 200, 220, 230, and 240, and each battery rack includes a battery 201, a battery 202, a battery 203, a battery 204, a battery ( 205), the battery 206, the battery 207, the battery 208, the battery 209, the battery 210 and the battery 211 were connected in series to constitute a battery rack. At this time, it is possible to create a battery rack voltage of 770V through 11 70V battery series connections. In this case, if there is a problem with one battery, the entire battery rack must be replaced, and only batteries with the same internal resistance as the State of Health (SOH) can be used.

Referring to Figure 2 (b), it can be confirmed that the energy storage device battery connection using a renewable battery according to an embodiment of the present invention. The battery unit includes battery racks 250, 270, 280, and 290, and each battery rack includes a battery 251, a battery 252, a battery 253, and a battery 254, each having a voltage of 200V to 300V, The battery rack may be configured by connecting the batteries 255, the batteries 256,?, And the batteries 25n in parallel. At this time, a battery rack voltage of low voltage (200V to 300V) may be made through parallel connection of the batteries. In this case, if there is a problem with one battery, each battery can be exchanged, and batteries having different internal resistances (SOHs) can also be used.

3 is a view for explaining in more detail the connection of the conventional energy storage battery.

Referring to FIG. 3, the conventional energy storage device battery unit 300 includes battery racks 310, 320, 330, and 340, and each battery rack includes a battery 311 having a voltage of 80.96V and a current of 94A. ) Are connected in series by 9, and 4 battery racks are connected in parallel. Therefore, it is possible to make a battery unit that stores a total of 274KW of power. In this case, if there is a problem with one battery, the entire battery rack must be replaced, and only batteries with the same internal resistance as the State of Health (SOH) can be used. Particularly, a battery rack cannot be configured through a series connection of a renewable battery for an electric vehicle in which the internal resistance of the battery varies depending on the use environment.

4 is a view for explaining in more detail the battery connection in the energy storage device using a renewable battery according to an embodiment of the present invention.

Referring to Figure 4, the battery unit 400 of the energy storage device using a renewable battery according to an embodiment of the present invention includes 10 battery racks (410, 420, 430, 440,?, 4n0), respectively The battery rack of can be configured by connecting the batteries (411, 412, 413, 414, 415, 416, 417, 418) with a voltage of 320V and a current of 12A in parallel, and connecting 10 battery racks in parallel again. . Therefore, it is possible to make a battery unit that stores a total of 274KW of power. In this case, even if there is a problem with one battery, each battery can be replaced without having to replace the entire battery rack, and batteries with different internal resistance (SOH) and internal resistance are also compatible. It is possible. Particularly, the battery rack may be configured in the present invention using a renewable battery for an electric vehicle in which the internal resistance of the battery varies according to the use environment. In addition, since the batteries are connected in a parallel type, there is an advantage that the battery cells can be easily adjusted.

5 is a view for explaining the configuration of the inverter of the power management unit in the energy storage device using a renewable battery according to an embodiment of the present invention.

Referring to FIG. 5, a power management unit of an energy storage device using a renewable battery according to an embodiment may include a DC-DC converter 510 and an inverter 520. According to an embodiment, a low-voltage inverter may be configured by including a DC-DC converter 510 in front of the inverter 520 that converts DC power into AC power.

For example, if all of the batteries are connected in parallel, a low voltage inverter (about 50 KW) may be needed because the battery should be driven at a much lower voltage than the battery of a conventional energy storage device. At this time, a low-voltage inverter can be connected in parallel to build a large-capacity system. That is, the energy storage device that was operated in the conventional central method can be constructed in a string method.

According to one embodiment, the low-voltage inverter may convert a DC power supply of a voltage of 200V or more and 400V or less into AC power.

6 is a block diagram illustrating an operation of a battery management unit in an energy storage device using a renewable battery according to an embodiment of the present invention.

Referring to FIG. 6, an energy storage device using a renewable battery includes a power conversion unit (610, PCS; Power Conditioning System), a power management unit (620, PMS; Power Management System), and a battery management unit (630, BMS; Battery Management System). And it may include a battery unit 640.

The battery management unit 630 according to an embodiment of the present invention can receive various information about the voltage, current, and temperature of the battery from the battery unit 640, and provides a protection function for overvoltage, overcurrent, and temperature of the battery unit. By judging, the battery cell can be protected from abnormal conditions.

The battery management unit 630 according to an embodiment may grasp characteristics of each battery and control charging / discharging of individual batteries in an optimal state.

The power management unit 620 according to an embodiment may communicate with the battery management unit 630 to control the current and voltage so that the battery rack and the battery cells are in an optimal state.

The device described above may be implemented with hardware components, software components, and / or combinations of hardware components and software components. For example, the devices and components described in the embodiments include, for example, processors, controllers, arithmetic logic units (ALUs), digital signal processors (micro signal processors), microcomputers, field programmable arrays (FPAs), It may be implemented using one or more general purpose computers or special purpose computers, such as a programmable logic unit (PLU), microprocessor, or any other device capable of executing and responding to instructions. The processing device may run an operating system (OS) and one or more software applications running on the operating system. In addition, the processing device may access, store, manipulate, process, and generate data in response to the execution of the software. For convenience of understanding, a processing device may be described as one being used, but a person having ordinary skill in the art, the processing device may include a plurality of processing elements and / or a plurality of types of processing elements. It can be seen that may include. For example, the processing device may include a plurality of processors or a processor and a controller. In addition, other processing configurations, such as parallel processors, are possible.

The software may include a computer program, code, instruction, or a combination of one or more of these, and configure the processing device to operate as desired, or process independently or collectively You can command the device. Software and / or data may be interpreted by a processing device, or to provide instructions or data to a processing device, of any type of machine, component, physical device, virtual equipment, computer storage medium or device. , Or may be permanently or temporarily embodied in the transmitted signal wave. The software may be distributed over networked computer systems, and stored or executed in a distributed manner. Software and data may be stored in one or more computer-readable recording media.

The method according to the embodiment may be implemented in the form of program instructions that can be executed through various computer means and recorded on a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, or the like alone or in combination. The program instructions recorded in the medium may be specially designed and configured for the embodiments or may be known and usable by those skilled in computer software. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tapes, optical media such as CD-ROMs, DVDs, and magnetic media such as floptical disks. -Hardware devices specifically configured to store and execute program instructions such as magneto-optical media, and ROM, RAM, flash memory, and the like. Examples of program instructions include high-level language codes that can be executed by a computer using an interpreter, etc., as well as machine language codes produced by a compiler. The hardware device described above may be configured to operate as one or more software modules to perform the operations of the embodiments, and vice versa.

As described above, although the embodiments have been described by a limited embodiment and drawings, those skilled in the art can make various modifications and variations from the above description. For example, the described techniques are performed in a different order than the described method, and / or the components of the described system, structure, device, circuit, etc. are combined or combined in a different form from the described method, or other components Alternatively, even if substituted or substituted by equivalents, appropriate results can be achieved.

Therefore, other implementations, other embodiments, and equivalents to the claims are also within the scope of the following claims.

100: energy storage device using renewable batteries
110: power converter
120: power management department
130: battery unit
131: first battery rack
132: second battery rack
133: third battery rack

Claims (7)

A battery rack in which a plurality of regenerative batteries are connected in parallel;
A power converter including a low voltage inverter connected to the battery rack; And
Power management unit for controlling charging or discharging of power in the battery rack
Energy storage device using a renewable battery comprising a. According to claim 1,
Energy storage device using a renewable battery, characterized in that it further comprises a battery management unit for controlling the charging and discharging between the battery rack and the battery cells of the renewable battery by identifying the characteristics of the renewable battery. According to claim 1,
The battery rack is an energy storage device using a renewable battery, characterized in that configured to facilitate the adjustment of the renewable battery. According to claim 3,
The battery rack is an energy storage device using a renewable battery, characterized in that it is compatible with renewable batteries having different internal resistance. The method of claim 4,
The low voltage inverter comprises a DC-DC converter, an energy storage device using a renewable battery. According to claim 1,
The low-voltage inverter is an energy storage device using a renewable battery, characterized in that for converting a DC power of a voltage of 200V or more and 400V or less to an AC power. According to claim 1,
The renewable battery is an energy storage device using a renewable battery, characterized in that the lithium ion battery for an electric vehicle with a remaining life.

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