WO2021045576A1

WO2021045576A1 - Battery protection apparatus and method using gas sensor

Info

Publication number: WO2021045576A1
Application number: PCT/KR2020/011979
Authority: WO
Inventors: 서정렬; 배진용; 안권웅
Original assignee: 인셀(주)
Priority date: 2019-09-06
Filing date: 2020-09-04
Publication date: 2021-03-11
Also published as: KR102051809B9; KR102051809B1

Abstract

The present invention relates to a battery protection apparatus using a gas sensor and, more specifically, to a battery protection apparatus using a gas sensor capable of determining whether or not a battery is abnormal through calculation of a sensing value of the gas sensor attached to a specific position and enabling an early warning.

Description

Battery protection device and method using gas sensor

The present invention relates to a battery protection device using a gas sensor, and more particularly, to prevent a potential fatal battery accident by diagnosing the presence or absence of a battery failure in real time through calculation of a detection value of a gas sensor attached to a specific location in a battery system. It relates to a battery protection device using a gas sensor that provides an early warning for doing so.

In general, ESS is an abbreviation of Energy Storage System, which means an energy storage system. It is a device that stores energy and makes it available when needed. In other words, it is a device that stores electricity (electricity), which is the most important in recent times among various types of energy. By storing electric energy and using it when necessary, it can improve the utilization of new and renewable energy and stabilize the power supply system. It is used as an eco-friendly and efficient energy source by applying it to various fields that supply the product.

ESS mainly consists of a battery system that stores power, a power conversion device that converts electricity to AC or DC, and a power management system (Energy Monitoring System, EMS) that manages and controls the entire system.

Among them, the battery type used in the battery system that stores electric power is mainly used as an electrochemical type battery, and it has a high fire risk due to the nature of an electrochemical type battery that stores high density energy, and has the risk of flammable gas emission and chain explosion in case of fire. have.

For this reason, it is essential to manage and monitor the battery system so that it can be safely used.

BMS is an abbreviation of Battery Management System, which is a device that manages battery cells, modules, and rack systems, and shows the maximum performance of battery cells such as battery cell capacity management/protection, usage history, life prediction, overcharge/overdischarge protection, and communication. It is a device that manages it so that it can be used safely.

The role of the BMS is to manage the battery, balancing the cell during charging and discharging, and protecting the cell even in the event of a short circuit. Overvoltage charging can damage the cell and permanently reduce capacity, even if it is several millivolts, and charging a cell that is almost completely discharged and in a low voltage state without pre-conditioning can damage the cell and seriously jeopardize battery safety. have. The BMS performs a function to safely protect the battery from overcharging/overdischarging of the battery, and when a single cell out of parallel with the total cell voltage is found, it cuts it off to protect the entire cell, and also performs a high temperature cutoff function. In other words, the life of the lithium battery is guaranteed only when it is managed by a BMS that keeps it from falling below a certain voltage and prevents charging above a certain voltage.

However, despite these protective functions, manufacturing defects, negligence during installation, inadequate environmental operation, and incongruity in integrated operation between systems act as a constant stress factor on the battery, which can eventually damage the battery cells. . When the battery is damaged, the battery electrolyte solvent decomposes and vaporizes along with the increase in the temperature inside the battery cell, increasing the internal pressure of the battery.When this internal pressure reaches a certain level, the vaporized gas is released to the outside of the cell in various ways depending on the battery type. It is done.

The exhausted gas is mainly composed of volatile organic compound (VOC) gas, which is flammable and forms a flammable atmosphere around it. When this situation continues, a rapid temperature rise inside the battery cell and a large amount of thermal energy are released, resulting in a thermal runaway phenomenon. High heat due to thermal runaway generated by the original damaged battery is transferred/conducted to adjacent cells, and as a result, the thermal runaway phenomenon is transferred. This eventually leads to a fire, leading to an irreversible dangerous situation for the safety of the entire battery system.

For example, dozens of fire accidents have occurred in succession in Korea only since 2017 due to careless design of the protection system and lack of management, and the damage amounted to tens of billions. As a result, uneasy sentiment is reflected, and the market of the domestic ESS industry is shrinking due to a general recession, and a crisis as well as enormous damage to the related industry is looming. The development of fire safety technology is urgently needed above all for the qualitative growth of the ESS industry and the strengthening of industrial competitiveness.

Therefore, it is necessary to develop a new battery protection device that prevents thermal runaway by detecting the gas discharged due to damage to the battery in advance and providing an early warning.

(Patent Document 1) Korean Patent Publication No. 2017-0031940

(Patent Document 2) Korean Patent Publication No. 2009-0131573

(Patent Document 3) U.S. Patent No.6204769

The present invention has been made to solve the above problems, and it is possible to quickly and accurately detect gas leakage using a gas sensor disposed at a specific location inside as well as the center of the upper plate of the outer case surrounding the battery, The purpose is to provide a battery protection device using a gas sensor that can monitor changes in the concentration of gas through BMS in real time and determine whether the battery is damaged or not and provide an alarm to the manager.

Another object of the present invention is to provide a battery protection device using a gas sensor capable of detecting gas by minimizing the influence of the air flow around the sensor by using a ventilated substrate.

Another object of the present invention is to provide an apparatus for protecting a battery using a gas sensor capable of generating an emergency warning signal by comparing with an allowable value using a comparator connected to a gas sensor.

In order to solve the above problems, the present invention provides an apparatus for protecting a battery using a gas sensor, comprising: an enclosure or space surrounding the battery; A gas sensor positioned in the space to detect a volatile organic compound gas; A BMS that is linked with the gas sensor and calculates a change in gas concentration based on a moving average value calculated as a measurement signal value of the gas sensor and determines an alarm step; It includes; a protection device for transmitting an alarm step through the BMS to the upper manager system that controls the battery.

The present invention provides a battery protection device using a gas sensor, comprising: an enclosure or space surrounding the battery; A gas sensor positioned in the space to detect a volatile organic compound gas; In connection with the gas sensor, the change in the measured signal value of the gas sensor is detected through a differentiator, and an alarm is transmitted to the upper manager monitoring system (e.g., EMS) that controls the battery system when it is less than the reference value by comparing it with the reference value. It is a protection device including;

In the battery protection device using a gas sensor in the present invention, in the gas sensor disposed in a space including a battery or in an enclosure, the upper plate of the space or enclosure has a square shape, and the square shape has a second axis adjacent to the first axis. Including, the straight lines extending from the center point of the first axis and the center point of the second axis are arranged at a point where they intersect each other, or if there is a spatial constraint, it is arranged at the center point of the first axis or the second axis, or the first axis And the second axis are arranged at the point where they intersect each other.

The present invention provides a battery protection device using a gas sensor, comprising: an enclosure or space surrounding the battery; A discharge fan attached to the enclosure; A gas sensor for detecting a volatile organic compound gas discharged from the battery in the enclosure; It is a protection device including a; sub-BMS electrically connected to the gas sensor.

The battery is a device that stores electrical energy through a chemical method.

The space or enclosure surrounding the battery includes a module surrounding a plurality of battery cells, a rack including a plurality of modules, or a battery chamber including a plurality of racks.

In the gas sensor, the upper plate of the enclosure has a square shape, and the square shape includes a second axis adjacent to the first axis, and a straight line extending from the center point of the first axis and the center point of the second axis crosses each other. It is disposed at a point where there is a spatial constraint, it is disposed at a center point of the first axis or the second axis, or disposed at a point where the first axis and the second axis intersect each other.

When the space including the battery is limited, for example, when the gas sensor is disposed in the battery module, the gas sensor may be disposed near the center of the first axis and the center of the second axis of the lower plate of the enclosure. Arranged at a point of intersection, located at the middle of the height of the enclosure and in a plane parallel to the lower side plate, at a point where the vicinity of the center of the first axis and the vicinity of the center of the second axis intersect each other, or The second axis is disposed at a point where they intersect each other, the first axis and the second axis of the enclosure intersect each other, or near the center of the first axis in a plane located at the middle of the height of the enclosure and parallel to the lower side Or disposed at a point where the second axes intersect each other, disposed near the center of the first axis of the upper plate of the case, disposed near the center of the first axis of the lower plate of the case, or located in the middle of the height of the case. And is disposed near the center of the first axis of the intermediate plane parallel to the lower side plate.

The gas sensor may be disposed in the air flow path from the exhaust fan installed in the enclosure, or arranged at a certain distance from the exhaust fan to the outside of the enclosure, or to some extent inside the enclosure from the exhaust fan to the lower direction. It may be spaced apart or disposed outside or inside the enclosure to some extent in the left or right direction from the discharge fan.

The present invention provides a battery protection device using a gas sensor, comprising: an enclosure surrounding a battery module; And a gas sensor positioned in the enclosure to detect a volatile organic compound gas.

In addition, the present invention is a battery protection device using a gas sensor, the enclosure surrounding the battery module; A discharge fan attached to the enclosure; A gas sensor for detecting a volatile organic compound gas in the enclosure; It includes a system that detects the rate of change of the signal value of the gas sensor through a differentiator, compares it with a reference value, and transmits an alarm to a higher level manager monitoring system (eg, EMS) that controls the battery system through BMS.

The gas sensor is installed on a ventilation type substrate, which is a substrate having a plurality of ventilation holes.

The gas sensor includes at least one of a metal oxide, a chemical resistance type, a semiconductor type, a photoion sensor, and an infrared sensor.

On the ventilated substrate, a metal oxide, chemical resistance, semiconductor, photoion, or infrared sensor capable of detecting VOC gas discharged or leaked from the battery due to an abnormality of the battery is formed.

A gas sensor PCB board is attached to the ventilated board, and a 12C communication interface for transmitting information generated by the gas sensor PCB board and the analog-to-digital converter to an external communication network is further included.

In connection with the BMS that manages the battery, it includes a gas detection sensor that detects gas discharged from the battery and a gas sensor module that calculates a change in gas leakage.

The differentiator is a device for generating a differential value by differentiating a rate of change of a signal value for each time.

In the present invention, in a battery protection method using a gas sensor for detecting a volatile organic compound gas discharged from a battery, an exponential moving average value is calculated as a measurement signal value of the gas sensor, and a normal gas concentration change range is set using the average value. And generating an alarm when the measured sensor signal value exceeds the normal change range.

In the present invention, in a battery protection method using a gas sensor for detecting a volatile organic compound gas discharged from a battery, the rate of change of the measured signal value of the gas sensor is detected through a differentiator attached to the gas sensor, and then compared with a preset reference value. If it is less than the reference value, generating an alarm; consists of.

The present invention provides a battery protection method using a module surrounding a plurality of batteries and a gas sensor positioned in the module to detect a volatile organic compound gas, wherein the measured signal value of the gas sensor is converted to one of the signal values through an exponential moving average value. Judging a change of a political abnormality and comparing it with an allowable value to generate an alarm when it exceeds the normal change range; Detecting the rate of change of the signal value of the gas sensor through a differentiator, comparing it with a reference value, and generating an alarm when it is less than the reference value.

The present invention relates to a battery protection method using a gas sensor that surrounds a battery module and detects a volatile organic compound gas by being located in the enclosure, wherein the measured signal value of the gas sensor is equal to or greater than a certain value of the signal value through an exponential moving average value. Determining a change, comparing it with an allowable value, and generating an alarm when it exceeds a normal change range; Detecting the rate of change of the signal value of the gas sensor through a differentiator, comparing it with a reference value, and generating an alarm when it is less than the reference value.

In the present invention made as described above, by installing a gas sensor in the battery module to detect gas discharged from the battery, it is possible to quickly and accurately determine whether or not the battery is damaged.

In addition, according to the present invention, a gas sensor location in a space in which a battery is located may be determined by using a property in which the discharged gas rises or a forced air flow may be used to detect the outflow of gas more quickly and accurately.

In addition, the present invention has an effect of increasing the efficiency of battery operation while reducing the risk of accidents such as ESS.

In addition, the present invention can reduce malfunctions according to the sensitivity of a sensor through various levels of allowable lower limit thresholds and number of warnings, and can notify alarms of various stages, thereby having the advantage of maintenance convenience and cost reduction for the administrator.

1 and 2 are views showing the appearance, function, and role of a general cylindrical battery cell according to the present invention.

3, 4, 5, 6, 7 is a battery box or rack including a battery module including a plurality of cylindrical battery cells connected in series or parallel according to the present invention and a plurality of electrically connected battery modules vertically stacked. And, it is a diagram showing a state in which a plurality of these are arranged in the battery room.

8, 9, and 10 are views showing a sensor on a MEMS substrate bonded to a wire, a photograph of the sensor, and a ventilated substrate on which a gas sensor module is mounted.

11 and 12 are diagrams illustrating a sensor signal according to a concentration of gas discharged from a battery according to another embodiment of the present invention and a sudden change in a sensor signal value according to a change in time.

13 and 14 are diagrams showing experimental results after attaching a gas sensor to a specific location in a certain space.

15, 16, 17, 18, 19, and 20 are views listing examples in which a gas sensor is attached to a specific position of a housing.

FIG. 21 is a graph showing an example of a measurement signal value, an Exponential Moving Average (EMA), and an allowable lower limit threshold value of a sensor over time according to another embodiment of the present invention.

22 is a circuit diagram for measuring a change in a sensor measurement value according to another embodiment of the present invention.

The present invention provides a battery protection device using a gas sensor, comprising: an enclosure or space surrounding the battery; A gas sensor positioned in the space to detect a volatile organic compound gas; A BMS that is linked with the gas sensor and calculates a change in gas concentration based on a moving average value calculated as a measurement signal value of the gas sensor and determines an alarm step; It includes; a protection device for transmitting an alarm step through the BMS to the upper manager system that controls the battery.

As an example of the battery cell 200 according to the present invention is shown in Figure 1a. According to this example, a top insulator (6) and a bottom insulator (8) for preventing short circuits at both ends of the positive terminal 1, the electrolyte housing 7 and the electrolyte housing 7 of FIG. 1B are included. In addition, a positive electrode/cathode/separator winding structure is impregnated in the electrolyte housing 7, a gasket 5 for preventing electrolyte leakage and insulation of the positive electrode/cathode, and a vent 4 for releasing gas when the internal pressure of the battery increases for safety. ) And a CID (3) that blocks the current by a vent (4) when the internal pressure rises.

2A shows the battery module 201 with the battery 200 mounted thereon and the sub-BMS 204 attached to the front end of the battery module 201 in the form of a plate to manage the state of each battery 200.

2C is a diagram showing the location of the sub-BMS 204 in the module. In the case of mounting a gas sensor for each module, as shown in FIG. 2C, for example, the position 200-5 of the gas sensor connected to the sub-BMS 204 in the module is shown. Since gas is diffused in the space and reaches the position of the final sensor, the detected gas concentration is proportional to the cube from the gas emission source to the sensing distance. Therefore, the smaller the sensing space is, the more effective it is to detect the gas quickly and accurately. For example, as an embodiment, it is most preferable to mount a gas sensor for each module.

Therefore, the present invention has a point of convenience during maintenance or replacement, since the location of a damaged battery can be identified in units of modules by mounting a gas sensor for each module.

In addition, the rack BMS 203 is positioned on the inner upper side of the enclosure or the rack 100 surrounding the plurality of battery modules 201-1 to 201-n on which the sub BMS 204 is mounted.

A discharge fan 101 for air cooling may be installed in the center of the upper portion of the enclosure or rack 100 for smooth air conditioning according to the degree of sealing of the enclosure or rack.

2D is a frame having a window exposed to the outside instead of the housing 100, so that a plurality of battery modules 201-1 to 201-n equipped with the sub-BMS 204 can be observed from the outside. In addition, a display window may be further formed on the front of the sub-BMS 204 or the rack BMS 203 to display the measured module or internal environment variables (internal temperature or gas alarm display).

FIG. 2E is a view in which a plurality of FIG. 2C is arranged (100-1, 100-n). Each battery module 201 is installed therein to serve as one battery system.

In the present invention, in the case of arranging gas sensors for each rack in consideration of additional complexity or economy when mounting gas sensors for each module, the gas sensor may be disposed on the upper side of the enclosure 100 in order to quickly and accurately detect gas leakage. I can.

Such a gas sensor arrangement can be said to be more effective when there is no forced airflow in the enclosure. The rack BMS 203 connected to the gas sensor may determine the change in the concentration of gas in real time and alert the administrator.

3A is a perspective view and a sectional view of the gas sensor 120 and a graph showing the amount of change 120-4 of the measured gas value over time.

The gas sensor 120 is formed by separating a plurality of electrodes 120-2 on the MEMS substrate 120-3, and a resistance value by adsorbing VOC gas from the surface at the center of the electrode 120-2. The changed metal oxide 120-1 is formed.

Looking at the operating principle of a gas sensor (eg, MEMS type VOC gas sensor; 120) according to an embodiment of the present invention, a metal oxide (MEMS substrate metal oxide; 120-1) is an electrode (electrode; 120-2). ) To detect gas.

The gas detection refers to a change in the concentration of the gas existing in the space in which the battery is operated, and the sensor signal value refers to an electric signal that changes when the sensor detection plate contacts air, and includes voltage and resistance. It is characterized in that an alarm signal is generated by determining the amount of gas detected by a change in the measured sensor signal.

For example, in the case of a metal oxide sensor, when the gas-sensitive metal oxide 120-1 is exposed to the gas, a change in conductivity of the metal oxide layer is measured to determine the amount of gas.

The gas sensor refers to all kinds of gas sensors including metal oxide, chemical resistance, semiconductor, photoion, and infrared sensors.

3B is an enlarged photograph and an internal transmission photograph showing the gas sensor of FIG. 3A in detail.

3C is a gas detection plate on which the gas sensor 120 is installed on a ventilated substrate 302 including a through hole 306 as a substrate 300 installed on the upper side of the exhaust fan 101 or in place of the position thereof. An AD converter 303 and an I2C interface 304 for digitally converting by receiving 301 and resistance values of the gas sensor 120 are formed.

It consists of a sensor PCB detection plate 301 including the gas sensor 120, an analog-to-digital converter 303, and an I2C interface 304.

As shown in FIGS. 4A and 4B, the sensor signal value 601 of the gas sensor 120 according to the present invention refers to an electric signal measured by the sensor and includes voltage and resistance values.

The change over time of the sensor signal value 601 is evaluated, and the presence or absence of a volatile organic compound gas is determined, and an alarm signal is generated based on the result.

As an embodiment of the present invention, when the slope of the sensor signal value obtained by using a differentiator (refer to FIG. 8) is less than the allowable slope value, it is determined that gas is detected. The allowable slope value should be much less than zero in order to prevent false alarms according to the sensitivity of the sensor.

When the gas sensor 120 used in the present invention is installed in a space where there is no forced air flow, the position of the gas sensor may be determined in consideration of the tendency of the gas discharged above the battery to rise above the ambient room temperature. As shown in Figs. 5a and b, a gas emission source that generates gas is placed at the center of a certain cube space, and the degree of detection of the gas is different according to the positions of the gas sensors 120 arranged in different directions from the gas emission source. As a result, the degree of detection was the best at the location of Sensor 2, followed by the better at the location of Sensor 1.

Therefore, in the present invention, the arrangement of the gas sensor is arranged at a point where straight lines extending from the center point of the first side and the center point of the second side corresponding to the position of Sensor 2 intersect each other (see Fig. 6a 103), or When it is difficult to arrange at the point due to spatial constraints, it is placed at the center point of the first axis or the second axis (see Fig. 6e 117), or at a point where the first axis and the second axis cross each other (see Fig. 6c 114). It is desirable to place it in ).

As shown in FIGS. 5A and 5B, when there is no forced air flow in the present invention, the gas discharged above the battery tends to rise above the ambient room temperature.

As another embodiment, as shown in Figs. 6 a, b, c, d, e, and f, the present invention relates to the vicinity of the center of the first shaft 108 of the lower plate 106 of the enclosure 100 and the second A point 107 where the central vicinity of the shaft 109 intersects each other, and is located in the middle of the height of the housing 100, and in a plane parallel to the lower plate 106, the vicinity of the center of the first shaft 112 (119) And a point 111 where the center of the second shaft 113 crosses each other, a point 114 where the first shaft 104 and the second shaft 105 of the enclosure 100 cross each other, and the enclosure ( The first axis 108 and the second axis 109 of 100) cross each other at the point 115, located in the middle of the height of the housing 100, and in the plane 110 parallel to the lower side, the first axis 112 ) In the vicinity of the center (119) or the second axis (113) crossing each other (116), the center of the first axis (117) of the upper plate (102) of the housing (100), the housing (100) It is located near the center 118 of the first axis of the lower plate 106 and at the middle of the height of the housing 100 of the housing 100 and is parallel to the lower plate 106.

When the gas sensor 120 used in the present invention is installed in a space with a forced air flow, for example, a forced exhaust fan is installed in the enclosure, and a gas sensor for detecting gas discharged due to abnormality of the battery in the enclosure is installed. In this case, it should be installed in the airflow path discharged from the exhaust fan to the outside, but if it is installed near the forced exhaust fan, it should be less affected by the exhaust air velocity and the sensor sensing surface should avoid contacting the airflow. Therefore, in the present invention, the gas sensor 120 is disposed to be spaced from the outside of the case in the upper direction of the discharge fan or inside the case in the lower direction to some extent or spaced from the discharge fan to some extent in the lateral direction.

When there is a forced air flow, the gas sensor 120 should be installed at the outlet of the air flow path, but when installed near the forced exhaust fan, it should be installed so that it is less affected by the air velocity.

In the present invention, as a method of determining the change in gas concentration using a gas sensor, the BMS linked to the gas sensor that received the sensor signal value measured from the gas sensor as shown in FIG. 7 is indexed by using the sensor signal value every hour. The moving average value (EMA) is calculated, and the allowable lower limit threshold (LB) is calculated as follows using the percentage (P%) set in advance from the EMA. LB = EMA × (1-P/100). At this time, the measured sensor signal value 503 and LB 501 are compared, and if the sensor signal value is less than the threshold, it is determined as a meaningful change in gas concentration, and an emergency warning signal is generated and transmitted to the manager (e.g., the manager terminal). do. Here, a meaningful change refers to a situation in which irreversible internal damage to the battery begins, leading to an accident. Here, the gas sensor signal value refers to an electric signal measured by the sensor and includes voltage and resistance.

In addition, as an embodiment of the present invention, the BMS linked to the gas sensor transmits an alarm signal to the upper BMS or the manager, thereby enabling the manager to quickly respond in case of an emergency. For example, in the case of monitoring gas for each module, it is transmitted from the sub BMS 204 to the rack BMS 203 and from the rack BMS 203 to the manager, and in case of monitoring gas for each rack, the path transmitted from the rack BMS 203 to the manager Finally, countermeasures can be taken.

As shown in FIG. 4B, in order to detect the steep slope (601-1) of the sensor signal value measured by the gas sensor, a differentiator (refer to FIG. 8) is mounted on the gas sensor to detect the slope and adjust the detected slope. Compared with the allowable slope, the sudden change of the sensor signal value over time is judged. Here, a sudden change refers to a situation in which gas emissions have begun due to irreversible internal damage to the battery. When a sudden change occurs, the differentiator that senses this is immediately transmitted to a manager (eg, a manager terminal) through a BMS linked to a gas sensor through the processor 305 and a digitized signal through the A/D converter 303.

That is, when the sudden slope 601-1 of FIG. 4B occurs, the differentiator detecting the occurrence may immediately transmit the digitized signal to the processor 305 through the A/D converter 303.

In addition, as an embodiment of the present invention, when the gas concentration value transmitted through the processor 305 of the differentiator is out of a certain reference value, the BMS linked to the corresponding gas sensor transmits an alarm signal to the upper BMS or the manager, Rapid response is possible. That is, when gas is monitored for each module, it is transmitted from the sub BMS 204 to the rack BMS 203 and from the rack BMS 203 to the manager, and when gas is monitored for each rack, the path transmitted from the rack BMS 203 to the manager Finally, countermeasures can be taken.

At this time, information on which sensor was measured, such as a gas sensor, a visible light camera, or an infrared camera, is also delivered to the manager to facilitate the determination.

In addition, a gas sensor, a visible light camera, or an infrared camera may roughly predict the gas generation point by measuring a distance away from the center point of the enclosure 100.

To this end, as an embodiment, the gas sensor 120 is disposed at the edge of the lower plate of the housing 100, and the edge of the lower plate is a line extending the center point of the first axis and the second axis adjacent to the lower plate. It is the point of intersection.

As another embodiment, the present invention may include the gas sensor 120 disposed near an upper plate edge and a lower plate edge of the enclosure 100.

Alternatively, it is possible to induce direct supervision by displaying the current status of an important dangerous place on the mobile terminal of a manager among dangerous places (eg, the location of a sensor that has detected the number of times of gas detection above a certain value) preset in the rack BMS 203.

By receiving the sensor detection signal, it is also possible to control the worker's mobile terminal, the manager's mobile terminal, or the manager's terminal to directly notify the danger.

In the present invention, a detection camera for determining detection of VOC gas discharged or leaking out of the battery due to an abnormality of the battery based on a change in the gas sensor signal value area may be disposed in the center of the upper plate of the housing 100. .

The center of the upper plate of the enclosure 100 is a point extending from the center of the first axis and the center of the second axis to cross each other.

The present invention may include a visible light camera for capturing a visible light image instead of the gas sensor according to the present invention, and an infrared camera for capturing an infrared image in the same area as the visible light camera.

In addition, it is also possible to directly observe the area where the gas has spread using a gas surveillance camera or the like.

As an embodiment, first, when the rate of change of the signal value of the gas sensor is large, a warning signal is sent to the administrator, and then the visible light images and infrared images captured by infrared cameras are combined, and the specified infrared image is stored in the DB in advance. When a gas temperature value is detected, a gas leak point is extracted, the extracted gas leak point is synthesized with a visible light image, and the final result image can be transmitted to the administrator.

Here, the feedback signal unit transmits a feedback signal including additional information obtained by combining visible light images and infrared images captured by infrared cameras to the manager.

In another embodiment, data of temperature distribution according to thermal images or correction data corrected by a thermal image correction unit in visible light images and infrared images captured by infrared cameras are used at the temperature at which gas leakage does not occur. Compare with reference data with distribution.

8 is a circuit diagram for measuring a change in a sensor measurement value according to another embodiment of the present invention. Referring to FIG. 8, the circuit for measuring the change in the measured value of the sensor includes a differentiator 307, a comparator 308, an AD converter 303, and a processor 305. The differentiator receives the control voltage Vcc so that the gas sensor 120 and the first resistor 121 divide the control voltage Vcc. When the battery is in a normal state, the gas sensor 120 is 600 [Ω], and when the battery is in an abnormal state, the gas sensor 120 is momentarily reduced to 250 [Ω]. Accordingly, in the present invention, a differentiator 307 for detecting an instantaneous change thereof is technically characterized. The differentiator 307 does not generate an output in a normal state, but generates an output when the battery is abnormal. In addition, a first capacitor 123 and a second resistor 122 are positioned in the comparator 308. An AD converter 303 for converting the analog signal of the comparator 308 into a digital signal is disposed, and a rack BMS 203 based on the signal of the processor 305 that processes the output signal of the AD converter 303 Alternatively, it is a technical feature that controls the sub BMS 204.

Therefore, by using the present invention, it is possible to prevent the thermal runaway progress of the batteries by quickly shutting down the system by the administrator in case of an emergency.

1: terminal

3: CID

4: vent

5: gasket

7: housing

100, 201: enclosure

101: exhaust fan

120: gas sensor

120-1: metal oxide

120-2: electrode

120-3: MEMS substrate

120-4: Change amount of gas measurement value

121: first resistance

122: second resistance

123: first capacitor

200: battery

200-5: gas sensor

201, 201-n: battery module

203: Rack BMS

204: sub BMS

300: substrate

301: gas detection plate

302: ventilated substrate

303: AD converter

304: I2C interface

305: processor

306: through hole

307: differentiator

308: comparator

501: lower allowable threshold

503: sensor signal value

Vcc: control voltage

Vc: comparator output voltage

V1: Comparator input voltage

Vref: reference voltage

Claims

In the battery protection device using a gas sensor,

A module 201 surrounding a plurality of batteries;

And a gas sensor 120 positioned in the module 201 to detect a volatile organic compound gas.
In the battery protection device using a gas sensor,

An outer enclosure 100 surrounding the battery module 201;

And a gas sensor 120 positioned in the outer enclosure 100 to detect a volatile organic compound gas.
The method according to claim 1 or 2,

A battery protection device using a gas sensor comprising a; BMS connected to the gas sensor, receiving the sensor signal value measured by the gas sensor, and generating an alarm according to the calculation process.
The method of claim 3,

The battery protection device is a battery protection device using a gas sensor, characterized in that for detecting a slope of a change in a sensor resistance value of the gas sensor.
According to claim 2

The gas sensor,

A second axis adjacent to the first axis of the upper plate in the outer enclosure 100 is formed,

The center point of the first axis and the center point of the second axis are disposed at a point where they intersect, the first side or the second axis, or the first side and the second axis are disposed at a point where they intersect. Battery protection device using a gas sensor.
In the battery protection device using a gas sensor,

An outer enclosure 100 surrounding the battery module 201 made of a plurality of batteries 200;

A discharge fan 101 attached to the outer enclosure 100;

A second side adjacent to the first side of the upper plate of the outer enclosure 100 is formed,

At a point corresponding to the center point of the first side or the second axis, from the outside of the outer enclosure to a certain distance in the upper direction, or from the position of the exhaust fan disposed on the upper plate of the outer enclosure 100 to the upper direction. A gas sensor 120 disposed at a predetermined distance and detecting a volatile organic compound gas in the outer enclosure 100;

A BMS electrically connected to the gas sensor 120;

The gas sensor 120 is composed of a MEMS substrate 120-3, an electrode 120-2, and a metal oxide 120-1;

The battery protection device is a battery protection device using a gas sensor comprising a; a differentiator for sensing the gradient of the change of the gas sensor.
In the battery protection device using a gas sensor,

A module 201 surrounding a plurality of batteries;

A gas sensor 120 positioned in the module 201 to detect a volatile organic compound gas;

The gas sensor 120 is composed of a MEMS substrate 120-3, an electrode 120-2, and a metal oxide 120-1;

A ventilation type substrate 302 having a plurality of ventilation holes formed below the gas sensor 120;

An AD converter 303 for changing the sensor resistance value of the gas sensor 120 from analog signal to digital;

The battery protection device includes a differentiator configured to detect a slope of a change in a sensor resistance value of the gas sensor.
The method according to claim 1 or 2,

The gas sensor can detect VOC gas

A battery protection device using a gas sensor comprising at least one of a metal oxide, a chemical resistance type, a semiconductor type, a photoion type, and an infrared sensor.
The method of claim 7,

A gas sensor, characterized in that a metal oxide, chemical resistance, semiconductor, photoion, or infrared sensor is formed on the ventilated substrate 302 to detect VOC gas discharged or leaked from the battery due to an abnormality of the battery. Battery protection device using.
The method of claim 7,

A gas sensor PCB board 301 is attached to the upper surface of the ventilated board, and a 12C communication interface 304 for transmitting information generated by the gas sensor PCB board 301 and the analog-to-digital converter 303 to an external communication network Battery protection device using a gas sensor, characterized in that it further comprises.
According to claim 2

Arranged at a point 107 where the center of the first shaft 108 and the center of the second shaft 109 of the lower plate 106 of the outer enclosure 100 intersect each other,

A point at which the vicinity of the center of the first shaft 112 and the vicinity of the center of the second shaft 113 intersect each other in a plane parallel to the lower plate 106 and located in the middle of the height of the outer enclosure 100 Placed at (111), or

The first shaft 104 and the second shaft 105 of the outer enclosure 100 are disposed at a point 114 where they intersect each other, or

The first shaft 108 and the second shaft 109 of the outer enclosure 100 are disposed at a point 115 where they intersect each other,

Arranged at a point 116 where the center of the first shaft 112 or the second shaft 113 intersects with each other in a plane 110 located in the middle of the height of the outer enclosure 100 and parallel to the lower side Or

It is disposed in the vicinity of the center 117 of the first axis of the upper plate 102 of the outer enclosure 100, or

Arranged in the vicinity of the center of the first axis 118 of the lower plate 106 of the outer enclosure 100, or

A battery protection device using a gas sensor, characterized in that it is located in the middle of the height of the outer enclosure 100 and is disposed in the vicinity of the center of the first axis of the intermediate plane parallel to the lower side plate 106.
The method of claim 4,

The differentiator is a device for generating a differential value by differentiating a rate of change of a sensor resistance value of the gas sensor 120 over time.
In the battery protection device using a gas sensor,

An outer enclosure 100 surrounding the battery module 201;

A gas sensor 120 positioned within the outer enclosure 100 to detect a volatile organic compound gas;

A discharge fan 101 attached to the outer enclosure 100;

A second side adjacent to the first side of the upper plate of the outer enclosure 100 is formed,

At a point corresponding to the center point of the first side or the second axis, from the outside of the outer enclosure to a certain distance in the upper direction, or from the position of the exhaust fan disposed on the upper plate of the outer enclosure 100 to the upper direction. Placed at a certain distance point;

The battery protection device obtains a moving average value using a sensor resistance value of the gas sensor, obtains a lower limit threshold value 501 as the average value, and compares the lower limit threshold value with the signal value; Device.
In the battery protection method using a gas sensor 120 located in a space or an enclosure including a battery to detect a volatile organic compound gas discharged from the battery,

The exponential moving average value (EMA) is calculated from the sensor signal value of the gas sensor 120, and the allowable lower limit threshold value (LB) is used as a preset percentage (P%) from EMA. LB = EMA × (1-P/100) After obtaining, when the signal value exceeds the allowable lower limit threshold through comparison of the signal value and LB, determining that the battery is irreversible and generating an alarm; or

After detecting a change in the resistance value of the gas sensor 120 through a differentiator, comparing it with an allowable reference value and generating an alarm by determining that gas is abnormally discharged from the battery when it is less than the reference value, and generating an alarm; Way.