KR102691863B1 - Fuse short circuit detection device for ESS operation - Google Patents

Abstract

If a fuse short circuit occurs during operation of the ESS (Energy Storage System), the battery management system (BMS) recognizes the fuse short circuit and notifies the user of the fuse short circuit in real time to prevent the ESS from being unusable through rapid fuse replacement. It relates to an ESS operation fuse short-circuit detection device that minimizes the fuse provided between the battery module output terminal (BATTERY+) and the output terminal (OUTPUT+) that supplies power to the load, and the current that limits the current flowing to the output terminal when the fuse is short-circuited. A fuse short-circuit detection unit that is connected to the limiter, current limiter, or battery module output terminal to detect a short-circuit of the fuse, a current charge/discharge unit that charges and discharges the output current of the fuse short-circuit detection unit, and operates with the current discharged from the current charge/discharge unit to Implement an ESS operation fuse short detection device, including a fuse short interrupt generator that generates a fuse short interrupt in the management system (BMS).

Description

ESS operation fuse short circuit detection device {Fuse short circuit detection device for ESS operation}

The present invention relates to fuse short-circuit detection in ESS operation. In particular, when a fuse short-circuit condition occurs during operation of an ESS (Energy Storage System), the battery management system (BMS) recognizes the fuse short-circuit and notifies the user of the fuse short-circuit in real time. It is about an ESS operation fuse short-circuit detection device that minimizes the unusability of the ESS through rapid fuse replacement.

In general, ESS (Energy Storage System) refers to a storage device that stores excessively produced power or irregularly produced renewable energy from power plants and transmits it when there is a temporary power shortage.

Specifically, ESS refers to a system that stores electricity in the electric power system to supply energy when and where it is needed. Like existing secondary batteries, it is a collection of storage systems integrated into one product.

Recently, the importance of ESS is emerging as an essential device that stores unstable generated energy in solar power generation, a rapidly growing new renewable energy source, and stably supplies it back to the power system when needed. If there is no ESS, serious problems such as sudden power outages may occur in the power system due to unstable power supply depending on wind or solar power. Therefore, storage is emerging as a very important field in this environment.

These ESSs have a fuse as a secondary protection concept to protect the internal ESS battery by short-circuiting when an unintended BMS operation state (failure) or current exceeding an unmeasurable range is detected and cannot be blocked. It is provided.

If the fuse is short-circuited, the ESS becomes unusable until the fuse is replaced.

Therefore, there is a need for technology to enable users to quickly recognize when a fuse provided in the ESS is short-circuited and to minimize the unusable time of the ESS through fuse replacement.

A previously proposed technology related to ESS is disclosed in Korean Patent Publication No. 10-2021-0071601.

The prior art disclosed in the patent document is comprised of a plurality of battery modules and a battery protection unit, where the battery protection unit is an MCU that controls charging and discharging of the ESS, and is connected between a plurality of battery modules and the output terminal of the ESS according to the control of the MCU. It is provided between the first main contactor and the second main contactor, the first main contactor and the second main contactor, and connects or blocks the plurality of battery modules and the first main contactor and the second main contactor. It is composed of a disconnector that connects or blocks.

With this configuration, the current flowing through the ESS is manually blocked using a disconnector even when it is not in a no-load state.

However, this prior art can manually block the current of the ESS without using an expensive circuit breaker, but it cannot detect a short circuit in the fuse provided between the battery module and the output, so the fuse is disconnected when the ESS is unusable. It takes a long time to detect a short circuit, which causes damage to the load as the ESS is out of service for a long time.

Republic of Korea Patent Publication No. 10-2021-0071601 (published on June 16, 2021) (current blocking device and method using a disconnector)

Therefore, the present invention was proposed to solve various problems that occur due to prolonged ESS unusability time caused by non-detection of a short circuit in the fuse provided in the ESS. A fuse short circuit occurs during operation of the ESS (Energy Storage System). In this case, the battery management system (BMS) recognizes the fuse short circuit and notifies the user of the fuse short circuit in real time, providing an ESS operation fuse short detection device that minimizes ESS unusability through rapid fuse replacement. The purpose is to do this.

In order to achieve the above-mentioned purpose, the “ESS operation fuse short circuit detection device” according to the present invention,

A fuse provided between the battery module output terminal (BATTERY+) and the output terminal (OUTPUT+) that supplies power to the load;

a current limiting unit that limits current flowing to the output terminal when the fuse is short-circuited;

a fuse short-circuit detection unit connected to the current limiting unit or the battery module output terminal to detect a short-circuit of the fuse;

a current charge/discharge unit that charges and discharges the output current of the fuse short detection unit;

It is characterized in that it includes a fuse short circuit interrupt generator that operates with the current discharged from the current charging and discharging unit to generate a fuse short circuit interrupt in the battery management system (BMS).

In the above, the current limiting unit is,

It is characterized by a plurality of current limiters consisting of a resistor and a capacitor configured in parallel.

In the above, the fuse short circuit detection unit,

When the fuse is short-circuited, the fuse short-circuit is detected using a potential difference between the battery module output terminal and the output terminal.

In the above, the fuse short circuit detection unit,

When the battery module is discharged, the potential of the battery module output terminal rises higher than that of the output terminal due to the fuse short circuit, and first and second diodes detect the current output from the battery module output terminal as a fuse short circuit signal;

When charging the battery module, the potential of the output terminal rises higher than that of the battery module output terminal due to the fuse short circuit, and the battery module includes third and fourth diodes that sense the current output from the output terminal as a fuse short circuit signal. .

In the above, the fuse short circuit interrupt generator is,

The light emitting diode emits light with the current output from the fuse short detection unit, and the photo transistor is turned on by the light emission of the light emitting diode, and the voltage of the fuse short circuit interrupt detection terminal (INT-FUSE) of the battery management system is grounded. The battery is discharged to generate a fuse short circuit interrupt in the battery management system.

In the above, the battery management system is,

When the voltage of the fuse short circuit interrupt detection terminal is in a low state, it is recognized as a fuse short circuit, and the fuse short circuit is displayed through a connected display device, or fuse short circuit information is transmitted to the administrator terminal through a communication module.

According to the present invention, when a fuse short circuit occurs during operation of the ESS (Energy Storage System), the battery management system (BMS) recognizes the fuse short circuit and notifies the user of the fuse short circuit in real time to encourage rapid fuse replacement. , It has the effect of helping to minimize the unavailability of ESS.

1 is a fuse connection structure diagram of an ESS system applied to the present invention;
Figure 2 is a circuit diagram of an ESS operation fuse short circuit detection device according to the present invention.

Hereinafter, an ESS operation fuse short circuit detection device according to a preferred embodiment of the present invention will be described in detail with reference to the attached drawings.

The terms or words used in the present invention described below should not be construed as limited to their usual or dictionary meanings, and the inventor may appropriately define the concept of the term in order to explain his/her invention in the best way. It must be interpreted with meaning and concept consistent with the technical idea of the present invention based on the principle that it can be done.

Therefore, the embodiments described in this specification and the configurations shown in the drawings are only preferred embodiments of the present invention and do not represent the entire technical idea of the present invention, and therefore various equivalents and It should be understood that variations may exist.

1 is a circuit diagram showing the structure of a fuse in an energy storage system (ESS) to which the present invention is applied. The fuse 20 is a battery module output terminal of a battery unit consisting of a plurality of battery modules 10 ( It is provided between BATTERY+) and the output terminal (OUTPUT+) that supplies power to the load.

In the present invention, when the fuse 20 operates, current flows, but when a current exceeding that allowed by the fuse 20 is detected and the fuse 20 is short-circuited, the flow of current is forcibly stopped and the battery is momentarily This is to detect a fuse short circuit using the potential difference that occurs between the module output terminal (BATTERY+, ⓑ) and the output terminal (Output+, ⓐ) and recognize this in real time to the battery management system (BMS) to enable rapid fuse replacement. .

Figure 2 is a circuit diagram of an ESS operation fuse short detection device according to the present invention, which includes a current limiter 30, a fuse short detection unit 40, a current charge/discharge unit 50, a fuse short interrupt generator 60, and a battery management system. It may include (70).

The current limiter 30 limits the current flowing to the output terminal (ⓐ) when the fuse 20 is short-circuited, and limits the current flowing to the photodiode 61 in the fuse short-circuit interrupt generator 60, thereby limiting the current flowing to the photodiode 61 in the fuse short circuit interrupt generator 60. It plays a role in preventing damage.

This current limiter 30 may be configured in parallel with a first current limiter made of a resistor R2 and a capacitor C1 and a second current limiter made of a resistor R3 and a capacitor C2.

The fuse short circuit detection unit 40 is connected to the current limiting unit 30 or the battery module output terminal ⓑ and serves to detect a short circuit of the fuse 20.

This fuse short-circuit detection unit 40 can detect a fuse short-circuit using the potential difference between the battery module output terminal ⓑ and the output terminal ⓐ when the fuse 20 is short-circuited.

To this end, when the battery module 10 is discharged, the fuse short-circuit detection unit 40 increases the potential of the battery module output terminal ⓑ relative to the output terminal ⓐ due to the fuse short circuit, thereby increasing the potential of the battery module output terminal ⓑ. ) first and second diodes (D1, D2) that detect the current output from the battery module (10) as a fuse short circuit signal, and when charging the battery module (10), the output terminal (ⓑ) is lower than the battery module output terminal (ⓑ) due to the fuse short circuit. It may include third and fourth diodes (D3, D4) that sense the current output from the output terminal (ⓐ) as the potential of ⓐ rises as a fuse short circuit signal.

The current charge/discharge unit 50 serves to charge/discharge the output current of the fuse short detection unit 40, and may be composed of a resistor R4 and a capacitor C3.

The fuse short circuit interrupt generator 60 operates with the current discharged from the current charge/discharge unit 50 and serves to generate a fuse short circuit interrupt in the battery management system (BMS) 70.

This fuse short circuit interrupt generator 60 causes the light emitting diode 61 to emit light with the current output from the fuse short detection unit 50, and the photo transistor 62 turns on due to the light emission of the light emitting diode 61. When turned on, the voltage of the fuse short circuit interrupt detection terminal (INT-FUSE) of the battery management system 70 can be discharged to ground (GND), thereby generating a fuse short circuit interrupt in the battery management system 70.

The battery management system 70 recognizes that the fuse is short-circuited when the voltage of the fuse short-circuit interrupt detection terminal (INT_FUSE) is low, and displays the fuse short-circuit through a connected display device or sends fuse short-circuit information to the administrator terminal through the communication module. It plays a role in transmitting.

The operation of the ESS operation fuse short circuit detection device according to the present invention configured as described above will be described in detail as follows.

First, when charging or discharging the battery module 10, if a set current within the allowable value flows, the fuse 20 operates statically, so that the current flows normally.

Afterwards, when a current exceeding that allowed by the fuse 20 is detected and a short circuit of the fuse 20 occurs, the flow of current is forcibly stopped and an instantaneous loss occurs between the battery module output terminal (BATTERY+, ⓑ) and the output terminal (Output+, ⓐ). The voltage increases.

In this way, the fuse short circuit is detected using the potential difference that occurs when the fuse 20 is short-circuited, and this is recognized in real time by the battery management system (BMS), so that the fuse can be replaced quickly, preventing the ESS from being used for a long time due to the fuse short-circuit. Try to minimize the time it takes.

For example, when the battery module 10 is discharged, if the fuse is short-circuited, the potential of the battery module output terminal (ⓑ) instantaneously rises compared to the output terminal (ⓐ), and the current output from the battery module output terminal (ⓑ) increases. It is transmitted to the fuse short detection unit 40 as a fuse short circuit signal, and when the fuse short circuit occurs when charging the battery module 10, the potential of the output terminal (ⓐ) instantly increases compared to the battery module output terminal (ⓑ). Therefore, the current output from the output terminal (ⓐ) is transmitted to the fuse short detection unit 40 as a fuse short circuit signal.

That is, when the battery module 10 is discharged, if the potential of the battery module output terminal (ⓑ) momentarily rises higher than the output terminal (ⓐ) due to a fuse short circuit, the fuse short circuit detected is output through the battery module output terminal (ⓑ). The current (fuse short signal) is first attenuated through the resistor R1 and then transmitted to the fuse short detection unit 40.

The first and second diodes D1 and D2 in the fuse short detection unit 40 half-wave rectify the fuse short detection current attenuated through the resistor R1, prevent reverse current, and output it.

The fuse short circuit signal output in this way is charged through the capacitor C3 of the current charge/discharge unit 50 consisting of a resistor R4 and a capacitor C3, and then discharged and transmitted to the fuse short circuit interrupt generator 60 (ⓓ).

The light emitting diode 61 of the photo coupler of the fuse short interrupt generator 60 emits light with the current discharged from the current charging and discharging unit 50, and the photo transistor 62 installed opposite to the light emitting diode 61 is It is turned on by the light emission of the light emitting diode 61. When the photo transistor 62 is turned on, the voltage applied to the pull-up resistor of the fuse short interrupt detection terminal (INT-FUSE) of the battery management system 70 is discharged to ground (GND), thereby causing the fuse short circuit interrupt. The state of the detection terminal (INT_FUSE) is transitioned to low, and a fuse short circuit interrupt is generated in the battery management system 70.

The battery management system 70 recognizes that the fuse is short-circuited when the voltage of the fuse short-circuit interrupt detection terminal (INT_FUSE) is in a low state, and displays the fuse short-circuit in real time through a connected display device (not shown in the drawing) to inform the user. It recognizes a fuse short circuit or transmits fuse short circuit information to a preset administrator terminal through a communication module (not shown in the drawing), allowing the user to recognize the fuse short circuit in real time, thereby encouraging fuse replacement.

Here, although not shown in the drawing, it is assumed that the battery management system 70 is connected to a display device for displaying information or is provided with a communication module capable of transmitting and receiving fuse short-circuit information to and from a user terminal.

A user who recognizes a short circuit in the ESS fuse through the display device or user terminal quickly replaces the fuse. As a result, it is possible to reduce the time it takes to identify the cause of ESS unavailability (in the event of a breakdown) by not detecting a fuse short circuit as before, thereby minimizing the unusable time of the ESS due to a fuse short circuit and supplying stable power. It becomes possible.

Next, when charging the battery module 10, if the fuse is short-circuited, the potential of the output terminal (ⓐ) instantaneously rises higher than the battery module output terminal (ⓑ), and a fuse short-circuit signal (fuse) is generated at the output terminal (ⓐ). A short circuit detection current) is generated and transmitted to the current limiting unit 30.

The current limiter 30 limits the current flowing to the output terminal (ⓐ) when the fuse 20 is short-circuited, thereby limiting the current flowing to the photodiode 61 in the fuse short-circuit interrupt generator 60. prevent damage.

That is, the current limiter 30 is configured in parallel with a first current limiter made of a resistor (R2) and a capacitor (C1) and a second current limiter made of a resistor (R3) and a capacitor (C2), so that the primary current A limiter is used to first limit the current output from the output terminal (ⓐ), and a secondary current limiter is used to secondarily limit the current output from the output terminal (ⓐ), causing the photodiode (61) to be damaged by overcurrent. prevents damage.

The fuse short-circuit detection current whose current is limited in the current limiting unit 30 is transmitted to the fuse short-circuit detection unit 40, and the fuse short-circuit detection current whose current is limited by the third and fourth diodes D3 and D4 is half-waved. It rectifies, prevents reverse current, and outputs (ⓒ).

The fuse short circuit signal output in this way is charged through the capacitor C3 of the current charge/discharge unit 50 consisting of a resistor R4 and a capacitor C3, and then discharged and transmitted to the fuse short circuit interrupt generator 60 (ⓓ).

The light emitting diode 61 of the photo coupler of the fuse short interrupt generator 60 emits light with the current discharged from the current charging and discharging unit 50, and the photo transistor 62 installed opposite to the light emitting diode 61 is It is turned on by the light emission of the light emitting diode 61. When the photo transistor 62 is turned on, the voltage applied to the pull-up resistor of the fuse short interrupt detection terminal (INT-FUSE) of the battery management system 70 is discharged to ground (GND), thereby causing the fuse short circuit interrupt. The state of the detection terminal (INT_FUSE) is transitioned to low, and a fuse short circuit interrupt is generated in the battery management system 70.

The battery management system 70 recognizes that the fuse is short-circuited when the voltage of the fuse short-circuit interrupt detection terminal (INT_FUSE) is in a low state, and displays the fuse short-circuit in real time through a connected display device (not shown in the drawing) to inform the user. It recognizes a fuse short circuit, or transmits fuse short circuit information to a preset administrator terminal through a communication module (not shown in the drawing), allowing the user to recognize the fuse short circuit in real time, thereby encouraging fuse replacement.

Here, although not shown in the drawing, it is assumed that the battery management system 70 is connected to a display device for displaying information or is provided with a communication module capable of transmitting and receiving fuse short-circuit information to and from a user terminal.

A user who recognizes a short circuit in the ESS fuse through the display device or user terminal quickly replaces the fuse. As a result, it is possible to reduce the time it takes to identify the cause of ESS unavailability (in the event of a breakdown) by not detecting a fuse short circuit as before, thereby minimizing the unusable time of the ESS due to a fuse short circuit and supplying stable power. It becomes possible.

According to the present invention described above, when a fuse short circuit occurs during operation of the ESS (Energy Storage System), the battery management system (BMS) recognizes the fuse short circuit in real time and notifies the user of the fuse short circuit in real time so that the user can quickly replace the fuse. By inducing , it is possible to minimize the unusability of the ESS.

Although the invention made by the present inventor has been described in detail according to the above embodiments, the present invention is not limited to the above embodiments, and various changes can be made without departing from the gist of the invention, as is known in the art. It is self-evident to those who have it.

10: Battery module
20: fuse
30: Current limiting unit
40: Fuse short detection unit
50: Current charging/discharging unit
60: Fuse short interrupt generator
70: Battery management system

Claims (6)

A fuse provided between the battery module output terminal (BATTERY+) and the output terminal (OUTPUT+) that supplies power to the load;
A current limiter that limits the current flowing to the output terminal (OUTPUT+) when the fuse is shorted;
a fuse short-circuit detection unit connected to the current limiting unit or the battery module output terminal to detect a short-circuit of the fuse;
a current charge/discharge unit that charges and discharges the output current of the fuse short detection unit; and
A fuse short circuit interrupt generator operates with the current discharged from the current charge/discharge unit to generate a fuse short circuit interrupt in a battery management system (BMS),
The fuse short detection unit,
When the battery module is discharged, when the potential of the battery module output terminal rises higher than the output terminal (OUTPUT+) due to the fuse short circuit, first and second diodes that detect the current output from the battery module output terminal as a fuse short circuit signal;
When charging the battery module, when the potential of the output terminal (OUTPUT+) rises higher than the output terminal of the battery module due to the fuse short circuit, third and fourth diodes detect the current output from the output terminal (OUTPUT+) as a fuse short circuit signal. Includes,
The fuse short circuit interrupt generator,
The light emitting diode emits light with the current output from the fuse short detection unit, and the photo transistor is turned on by the light emission of the light emitting diode, and the voltage of the fuse short circuit interrupt detection terminal (INT-FUSE) of the battery management system is grounded. An ESS operation fuse short circuit detection device characterized in that it generates a fuse short circuit interrupt in the battery management system by discharging it to .
In claim 1, the current limiting unit,
An ESS operation fuse short circuit detection device characterized by a plurality of current limiters composed of a resistor and a capacitor configured in parallel.
In claim 1, the fuse short circuit detection unit,
An ESS operation fuse short-circuit detection device, characterized in that it detects a fuse short-circuit using a potential difference between the battery module output terminal (BATTERY+) and the output terminal (OUTPUT+) when the fuse is short-circuited.
delete delete In claim 1, the battery management system includes:
An ESS operation fuse that recognizes a fuse short circuit when the voltage of the fuse short interrupt detection terminal is in a low state, displays the fuse short circuit through a connected display device, or transmits fuse short circuit information to the administrator terminal through a communication module. Short circuit detection device.

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