WO2018066728A1

WO2018066728A1 - Method and device for suppressing combustion inside battery pack

Info

Publication number: WO2018066728A1
Application number: PCT/KR2016/011190
Authority: WO
Inventors: 박필구
Original assignee: 주식회사 피엠그로우
Priority date: 2016-10-06
Filing date: 2016-10-06
Publication date: 2018-04-12

Abstract

A method and a device for suppressing combustion inside a battery pack are disclosed. The method for suppressing combustion comprises the steps of: acquiring a signal for a change in illuminance inside the battery pack by using a sensor coupled to the battery pack; and cutting off the flow of air between the inside and the outside of the battery pack through a fire suppression device coupled to the battery pack in response to a signal level recognized according to the change in illuminance.

Description

Method and device for suppressing combustion inside the battery pack

The present disclosure relates to a method and apparatus for suppressing combustion inside a battery pack.

Recently, in the automobile field, energy storage device, and the like, the construction of a power system using battery packs has been greatly increased. In general, a battery pack stores a plurality of battery modules including a plurality of battery cells in a housing, and connects a plurality of battery modules included in one or more housings in series, in parallel, or in parallel to provide a voltage or current required by a load. Is made.

In the battery pack, many lithium batteries using lithium ions are used in terms of performance and efficiency. Lithium batteries have a risk of fire or explosion, so care must be taken in handling them.

In particular, when the battery pack is used in a harsh environment where vibrations or shocks are frequent such as a driving state of a hybrid automobile or an electric vehicle, securing safety of the battery pack is a very important problem.

In addition, energy storage devices often use several to tens of battery modules to increase power capacity. In that case, the importance of temperature management for the individual battery modules or battery packs becomes significantly greater in order to prevent the risk of fire or explosion of the battery modules or battery packs.

As described above, in a battery module or a battery pack using a lithium ion battery, there is a demand for a method capable of ensuring the stability of the battery module or the battery pack from a risk of fire or explosion.

An object of the present invention for solving the above problems, by detecting the change in the illumination of the inside of the battery pack to block the air flowing into the outside from inside the battery pack, which can effectively suppress the combustion inside the battery pack, It is to provide an internal combustion suppression method.

Another object of the present invention is to provide a combustion suppression apparatus inside a battery pack, which can effectively block external air introduced into the battery pack according to a change in illuminance inside the battery pack.

In accordance with an aspect of the present invention, there is provided a method of suppressing combustion in a battery pack, by using a sensor coupled to a battery pack, acquiring a signal for a change in illuminance in the battery pack, and Blocking air flow inside and outside the battery pack through a fire suppression device coupled to the battery pack in response to the recognized signal level.

Here, the sensor includes an illuminance sensor, the illuminance sensor detects a change in illuminance of the first illuminance or more within the battery pack, and the first illuminance may be l lux.

Here, the method of suppressing battery pack combustion further includes the step of forming the inside of the battery pack in a vacuum or vibrating state after the blocking step, wherein the vibrating state includes the amount of air in the battery pack and the amount of air consumed by combustion. Even if it may include a state lower than the amount of air in the blocking step.

Combustion suppression apparatus inside the battery pack according to another aspect of the present invention is coupled to the battery pack and the input terminal receives a signal from the sensor for detecting the change in illumination of the battery pack, and the sensor coupled to the battery pack and output in accordance with the change in illumination And a control unit for blocking air inflow from the outside of the battery pack in response to the signal, wherein the control unit blocks an air circulation passage connecting the outside and the inside of the battery pack.

Here, the combustion suppression apparatus inside the battery pack may further include an air hole pump coupled to the battery pack. The control unit may control the air ball pump after blocking the inflow of air to form the inside of the battery pack in a vacuum or excited hole state. The excited air condition may include a state in which the amount of air in the battery pack is lower than the amount of air in the blocking step, even when the amount of air consumed by combustion is taken into consideration.

Here, the combustion suppression apparatus inside the battery pack may further include a foam injection device coupled to the outside of the battery pack. The foam injection device may include a plurality of nozzles installed adjacent to the plurality of air circulation passages of the battery pack. The controller may control the foam injection device in response to the signal of the sensor. The foam spraying apparatus may cover the air circulation passages by spraying a foam including inert and curable material on the plurality of air circulation passages through the plurality of nozzles under the control of the controller.

When utilizing the combustion suppression method and apparatus inside the battery pack, it is possible to effectively suppress the combustion inside the battery pack to prevent fire or explosion of the battery pack in advance.

In addition, by injecting extinguishing materials into the battery pack to prevent combustion, the inside of the battery pack is instantaneously vacuumed to suppress combustion or extinguish the fire. Alternatively, a significant portion of the battery can be reused.

In addition, even when combustion or fire occurs in a relatively large battery pack used for a bus or an energy storage device, a sensor for detecting an illumination intensity inside a battery pack having a relatively low illuminance may be used. Detecting the start of fire has a significant advantage in detecting performance compared to temperature sensors.

1 is a block diagram illustrating a battery pack to which a combustion suppression apparatus inside a battery pack is applied according to an exemplary embodiment of the present invention.

2 is a flowchart illustrating a method of suppressing combustion inside a battery pack according to an exemplary embodiment of the present invention.

3 is a flowchart illustrating a method of suppressing combustion inside a battery pack according to another exemplary embodiment of the present invention.

4 is a flowchart illustrating a combustion suppression method inside a battery pack according to another exemplary embodiment of the present invention.

5 is an exemplary diagram of an illuminance sensor that may be employed in the battery pack of FIG. 1.

6 is a circuit diagram of the illuminance sensor of FIG. 5.

FIG. 7 is a block diagram illustrating a battery pack to which a combustion suppression apparatus inside a battery pack is applied, according to another exemplary embodiment.

8 is a view for explaining the use of the battery pack according to the present embodiment.

9 is a partially exploded perspective view of the battery pack of FIG. 8.

As the present invention allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

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

When a component is referred to as being "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that other components may be present in between. Should be. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that there is no other component in between.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

Hereinafter, with reference to the accompanying drawings, it will be described in detail a preferred embodiment of the present invention. In the following description of the present invention, the same reference numerals are used for the same elements in the drawings and redundant descriptions of the same elements will be omitted.

Referring to FIG. 1, the battery pack 100 according to the present exemplary embodiment includes a plurality of battery modules 10 and a housing 20 accommodating the battery modules 10. The battery pack 100 may further include a battery management system (BMS) 15.

In addition, the battery pack 100 may include at least one or more sensors, and may further include a pipe forming an air flow path inside and outside the battery pack 100 through an opening of the housing. It may further include a vacuum pump 40 coupled to the opening of the pack 100 to block the air flow passage or to discharge the air inside the battery pack to the outside depending on the implementation.

Since the plurality of battery modules may have substantially the same size or specifications, the present embodiment will be described based on one battery module for convenience of description. The battery module 10 may include a plurality of battery cells (hereinafter, also referred to as 'cells'). The plurality of battery cells may be connected in series, in parallel or in parallel. The cell may comprise a lithium ion battery.

The housing 20 protects the battery module 10 and the BMS 15 and the like, and may be manufactured in a form suitable for transport or use of the battery pack 100. The housing 20 may be made of a material of a certain strength or more for protection of the internal configuration. The housing 20 may be referred to as a case or a battery case.

In addition, the housing 20 may be provided with components for allowing air to circulate in a natural convection or forced flow manner between the interior and the exterior. Such components may be referred to as air flow channels, and may include at least one or more openings or ducts / pipings that couple to these openings.

The BMS 15 detects a voltage (V), a temperature (T), state information (S1), etc. of a plurality of cells in the battery module, and a control signal (S2) or a signal (Sn) for cell balancing according to the detected information. You can output In addition, the BMS 15 may transmit or receive predetermined data through communication with a master BMS or a higher / top BMS.

The BMS 15 may be mounted in each battery module 10, and may further include a master BMS mounted in the battery pack 100 according to an implementation. The master BMS communicates with slave BMSs mounted in each battery module 10 and may receive sensing information and status information from them or transmit cell balancing signals thereto. In addition, the master BMS may communicate with the highest BMS outside the battery pack 100 and transmit and receive a predetermined signal or data.

The sensor may include an illuminance sensor for detecting a change in illuminance inside the battery pack 100. In the present embodiment, the sensor comprises two first illuminance sensor groups 70a, two second illuminance sensor groups 70b, two third illuminance sensor groups 70c, and two fourth illuminance sensor groups 70d. Include.

When the illumination sensor group is used, when an illumination change of a certain area inside the battery pack 100 is detected, an abnormality occurs or a failure occurs in one illumination sensor by comparing signal levels from sensors in the group. Status can be determined. In addition, the use of the illumination sensor group can reduce the detection error or malfunction due to the performance difference of the individual illumination sensor by using the average of the signal level of the sensors in the group.

The vacuum pump 40 coupled to the battery pack 100 is a device for removing air molecules in the battery pack 100 when the battery pack 100 has an airtight container structure. Of course, the vacuum pump 40 may serve as a blocking unit to block the air flow in the opening to which the vacuum pump 40 is coupled in the battery pack 100.

In FIG. 1, the vacuum pump 40 is shown to occupy all the middle portions of one pipe, but the present invention is not limited to such a configuration, and the vacuum pump 40 is not limited to the intake pipe of at least two pipes (for example, an intake pipe and an exhaust pipe). It may include a structure in which the first portion is coupled and the second portion is coupled to the exhaust pipe. Here, the first portion may include a valve structure such as a solenoid valve capable of blocking the intake pipe, and the second portion may include a vacuum pump structure installed in the exhaust pipe. The vacuum pump structure may have a structure such as a rotary vane pump, a rotary piston pump, a rotary gear pump, a piston pump, a diaphragm pump, a roots pump, a water seal pump (including a rotor blade and a cylinder having several wings), and the like.

In addition, the vacuum pump 40 may discharge the air inside the battery pack 100 under the control of the controller to form the inside of the battery pack 100 in a vacuum or false vacuum state. Here, the controller may be a combustion suppression function that is additionally mounted to a controller or a processor in the BMS 15.

In the above-described case, the BMS 15 may store a program or a software module implementing the combustion suppression method in the battery pack in a memory, and according to the implementation, the BMS 15 or its controller or processor may include a battery pack. It may be referred to as an internal combustion suppression device. In this case, the combustion control device inside the battery pack may be implemented to control the operation of the air pump 40 functioning as a fire suppression device or a foam injection device described later.

The above-described vacuum may refer to a state in which a gas pressure in the internal space of the battery pack 100 is lower than atmospheric pressure, that is, a molecular density is less than about 2.5 × 10 ¹⁹ molecules / cm 3. The vacuum state inside the battery pack 100 may vary according to the altitude of the place where the battery pack 100 is used. In this embodiment, a false vacuum may refer to a field having a pressure lower than atmospheric pressure or lower than the air pressure at a predetermined time point inside the battery pack. The excitation holes may correspond to low vaccum at levels below 1 bar and above 10 ⁻⁵ bar.

Referring to FIG. 2, a method of suppressing combustion inside a battery pack according to the present embodiment is as follows.

First, the combustion suppression apparatus or the control unit detects a change in illuminance inside the battery pack (S10).

The controller may be at least some of the functional units of the BMS disposed inside or outside the battery pack, or may be a component that performs an operation corresponding to the functional units. In this case, the combustion suppression device may comprise a BMS.

In addition, the controller may be a separate control device, and may be at least some functional units or components installed in a computer terminal, a smartphone, or the like of an administrator or a user, depending on the implementation. In this case, the combustion suppression apparatus may include at least some functional units or components of a computer terminal or a smartphone.

In the case of using the above-described control unit, for example, the illuminance sensor may be equipped with a wireless communication module (for example, Bluetooth) and transmit sensing information to a computer terminal or a smartphone outside the battery pack via a wireless network. In this case, a computer terminal or a smartphone that interoperates with a system that detects a danger, such as a fire of the battery pack, may control a control signal for checking the state of the battery pack, suppressing combustion inside the battery pack, or extinguishing a fire based on the received detection information. Can be transferred to the corresponding battery pack side. The control signal can be used to control the operation of the fire suppression apparatus.

The illuminance level (reference level), which is a criterion of the illuminance change, may be set to a case where a predetermined level or more is brighter than the normal illuminance based on the structure of the battery pack.

For example, if the housing has an opening for natural circulation of the atmosphere, the illuminance sensor or the group adjacent to the opening or in the brightest area and the reference of the illuminance sensor or the group farthest from the opening and in the darkest area Levels can be set differently.

On the other hand, when the housing has a forced forced circulation structure (piping and pump, etc.) of the atmosphere, the reference level of at least one illuminance sensor group installed inside the battery pack may be set the same.

In fact, since combustion refers to a phenomenon of emitting heat and radiating light, it is easy to detect a change in illuminance when combustion occurs, but it is not easy to detect a change in illuminance when only heat is emitted as a state immediately before combustion.

In order to compensate for this disadvantage, in another embodiment of the present invention, a paint containing fluorescent and / or phosphorescent materials that emit heat is applied to the inner wall of the housing, the outside of the battery pack, the position facing the illumination sensor on the inside of the housing, and the like. It may include. The application area may be a small area of 1 cm 2 or less, in which case the illuminance sensor may be set to have the area to which the paint is applied as the main monitoring area.

Next, when the change in illuminance is greater than or equal to the reference level, air inflow from the outside of the battery pack is blocked (S20).

Blocking the inflow of air from the outside of the battery pack may include blocking an air flow path such as an opening of the housing of the battery pack to prevent outside air from entering the battery pack. This blocking process may be performed through the vacuum pump described above or the foam cutting device described below.

Referring to FIG. 3, in the combustion suppression method of the battery pack according to the present exemplary embodiment, first, a change in illumination intensity inside the battery pack is detected based on a signal obtained from an illumination sensor installed inside the battery pack (S10).

Next, it is determined whether the detected illuminance (detection illuminance) is equal to or greater than the reference illuminance (S12). If the level of the sensing illuminance is less than the level of the reference illuminance, it may be returned to the step of detecting the change in the illuminance again.

On the other hand, if the detected illuminance is greater than or equal to the reference illuminance, it may be determined whether the illuminance changes in the individual sensor groups coincide with each other within a predetermined error range (S14). According to this determination process, when an error occurs in any one of the illuminance sensors installed in the battery pack, the sensor failure signal for at least one sensor of the corresponding sensor group may be output (S16). In addition, since other sensors in the sensor group can detect whether there is a sensor abnormality, it is possible to prevent a malfunction of the combustion suppression device due to the sensor signal.

Next, when the detected illuminance is determined to be greater than or equal to the reference illuminance in the above determination result, the inflow of air from the outside of the battery pack is blocked (S20).

On the other hand, even when the air inlet is blocked, if the temperature of a specific cell or the inside of the battery pack increases or the signal level detected by the illumination sensor is still high or increased, the air inside the battery pack is discharged to exhaust the air inside the battery pack. It may be formed in a vacuum or excited state (S30).

The formation of the vacuum / vacuum state may be performed when the specific conditions described above are met or when a specific event occurs, but is not limited thereto. The vacuum / vacuum state may be immediately performed after the blocking process for rapid combustion suppression.

Referring to FIG. 4, the method of suppressing combustion in the battery pack according to the present exemplary embodiment may be substantially the same as the method described with reference to FIG. 3 except that the process of forming a vacuum / vacuum state is specified. Therefore, detailed description of the overlapping process will be omitted.

After blocking the air flow inside and outside the battery pack, it is possible to discharge the air inside the battery pack to the outside by using a vacuum pump (S32).

After discharging a predetermined amount of air to the outside of the battery pack, it may be determined whether the vacuum degree inside the battery pack is greater than or equal to the reference vacuum degree (S34). Such a degree of vacuum determination may be performed through a vacuum gauge attached to a vacuum pump, and may be transmitted to the controller by a sensor coupled to the vacuum gauge.

As a result of the above determination, if the internal vacuum degree is less than the reference vacuum degree, the control unit resumes the air releasing operation of the vacuum pump or maintains the existing releasing operation state and returns to the previous air releasing step so that an additional amount of air is discharged to the outside of the battery pack. Can go (S32).

On the other hand, as a result of the above determination, if the internal vacuum degree is higher than the reference vacuum degree, it is possible to check whether the combustion suppression operation is properly performed by re-sensing the change in the illumination intensity inside the battery pack. In this case, in order to check the normal state of the combustion suppression operation, the battery pack state information such as temperature and voltage may be checked again in addition to the illumination change detection.

Of course, if it is determined that the combustion suppression operation is not normally performed according to the implementation, it is possible to additionally discharge the internal air of the battery pack to the outside. In this case, further release of the internal air can be carried out up to the maximum of the range in which the capacity of the vacuum pump is allowed.

Referring to FIG. 5, an illuminance sensor that can be employed in the combustion suppression apparatus in the battery pack according to the present embodiment includes a sensor main body and a sensing unit 70, and the sensing unit 70 includes a substrate 71 and a lead wire. 72, a filament 73 and a cover 75 are provided.

The sensor body (not shown) may be a device (or a circuit) that detects a parameter change such as a voltage, a resistance, or the like and outputs the parameter change according to a change in the state of the filament.

The substrate 71 may be a plastic or metal substrate, and may have various shapes such as a disk shape, a polygonal plate shape, a square plate shape, and the like.

A pair of lead wires 72 may be coupled to the substrate 71. The lead wires 72 may be connected to the sensor body.

The filament 73 may be formed of heat treated cadmium sulfide (CdS), and may be disposed on one surface of the substrate 71. Both ends of the filament 73 may be bonded to one end of the pair of lead wires 72 coupled to the substrate 71 and exposed on one surface of the substrate 71. The bonded portion 74 may lie on the substrate 71 in the form of a circle.

The cover 75 may be formed of glass or plastic material. The cover 75 may be manufactured at least partially transparent. The cover 75 may be bonded to the substrate 71 through a hermetically shielded material so as to cover one surface of the substrate 71 and the filament 73 is hermetically disposed in a space between the substrate 71 and the substrate 71. In this embodiment, the disk-shaped substrate 71 and the disk-shaped cover 75 are integrated in a form in which the disk-shaped substrate 71 is welded to each other at the edge boundary portion 76.

The above-described illuminance sensor 70 has no polarity and has a characteristic that the conductivity changes according to the amount of ambient light. That is, the greater the amount of ambient light, the higher the conductivity and the lower the resistance. For example, it may have a resistance of about 10 kW at 10 lux and about 200 kW in a dark room or similar environment.

6 is a circuit diagram of the illuminance sensor of FIG. 5.

Referring to FIG. 6, the illuminance sensor according to the present embodiment may be driven by a battery power source connected to a lead wire. The sensing unit 70 having the filament is connected to the positive terminal and the negative terminal (or ground terminal) of the battery power source. A resistor R1 for preventing overcurrent may be connected between the sensing unit 70 and the positive terminal. The resistance of the resistor R1 may be about 10 kΩ.

According to the above configuration, the voltage division value due to the resistor R1 and the filament resistance in the sensing unit 70 may be output through the output terminal Vout. As the level of illuminance increases and the filament resistance decreases, the voltage at the output stage can increase.

Referring to FIG. 7, the battery pack 100 according to the present embodiment includes a housing 20 for accommodating a plurality of battery modules 10, at least one sensor disposed inside the housing 20, and a housing. Foam injection device 50 coupled to the 20 may be included.

The housing 20 may have a passive atmospheric circulation structure. Such a structure may include at least one opening disposed in the housing 20. In the present exemplary embodiment, the atmospheric circulation structure includes a structure in which air passages 22 each including a plurality of openings for allowing air flow between the battery pack 100 and the outside are disposed diagonally in two places of the housing 20. do.

According to the passive atmospheric circulation structure, the air heated in the battery pack 100 may move along the flow path inside the battery pack and be discharged to the air passage 22, thereby relatively relatively outside the battery pack. Cool air may enter the battery pack through the air passage 22.

Similar to the case of FIG. 1, the sensor may include an illuminance sensor that detects a change in illuminance inside the battery pack 100. In the present embodiment, the sensor comprises two first illuminance sensor groups 70a, two second illuminance sensor groups 70b, two third illuminance sensor groups 70c, and two fourth illuminance sensor groups 70d. It may include, but is not limited to, the number of different positions and / or other sensors according to the size or shape of the housing 20 and / or the size or arrangement of the battery module or BMS housed in the housing 20 It may be arranged in at least one group of.

The foam spraying device 50 may spray the foam material stored in a container (not shown) stored in the foam spraying device 50 to the nozzle 60 in response to a control signal of the controller output in response to the signal level detected by the sensor. Can be. For the injection of the foam material, the container of the foam injection device 50 may be a compression container. In addition, the foam injection device 50 may be provided with an injection device such as a separate compressor or an actuator for the injection of the foam material.

The nozzle 60 is connected to the vessel via a pipe 62 and can be placed in any position through the pipe 62. In the present embodiment, the nozzle 60 may be disposed at a position adjacent to the air passage 22 or on the air passage 22.

According to this configuration, when a predetermined control signal from the control unit is output, the foam spraying device 50 can spray the foam material through the nozzle 60, and the foam material sprayed from the nozzle 60 is the air passage. Covering (22), the foam material is hardened to hermetically seal the air passage (22), whereby the internal space of the battery pack 100 can be in an airtight state.

As described above, according to the present embodiment, when combustion occurs in the battery pack 100, the controller detects this through a sensor and controls the foam injection device to seal all the air passages 22 of the housing 20. By doing so, the combustion generated inside the housing 20 can act to be automatically extinguished by oxygen deficiency. In addition, the rigid foam material can be removed from the air passage 22 by physical force, etc., in which case there is an advantage that most components of the battery pack can be recycled.

Meanwhile, the battery pack 100 according to the present embodiment may further include a light emitting material 72 applied to a predetermined region of the inner wall of the housing. The light emitting material 72 may include a phosphor that emits light while being raised to a high energy level by external heat and immediately descending to a low energy level. According to such a configuration, it is possible to suppress the combustion by quickly detecting an abnormal state related to the combustion or the fire inside the battery pack in a temperature rising atmosphere immediately before combustion occurs in the battery pack.

8 is a view for explaining the use of the battery pack according to the present embodiment. 9 is a partially exploded perspective view of the battery pack of FIG. 8.

Referring to FIG. 8, the battery pack 100A capable of employing the combustion suppression apparatus according to the present embodiment may be a battery pack for an electric bus. The battery pack 100A may be transported through the jig 200 of the battery replacement station and mounted on or separated from the electric bus 300. The side of the battery pack 100A may be provided with a fastening groove 19c to which the jig 200 is fastened.

The battery pack 100A may accommodate a total of 14 battery modules arranged in two rows of seven, and may include a sensor disposed between at least some battery modules. The sensor may transmit a sensing signal or a corresponding signal to the BMS or a separate control device.

In addition, the battery pack 100A may act to block air flow between the inside and the outside of the battery pack when an event is detected through the sensor through a vacuum pump coupled to the housing of the battery pack for air flow. Foam injection devices may be used to block air flow. In some implementations, the air inside the battery pack may be discharged to the outside through the vacuum pump to form the inside of the battery pack in a vacuum or a hollow state.

According to the above embodiment, the vacuum pump and the foam ejection apparatus are exemplarily used independently, but the present invention is not limited to such a configuration, and of course, the vacuum pump and the foam ejection apparatus may be combined.

In addition, in the above-described embodiment, the foam injector is shown as being disposed outside the housing, but the present invention is not limited to such a configuration, and the shape of the housing may be modified to accommodate the foam injector at one side of the housing. It is possible. In this case, the nozzle may be located inside the air passage through the pipe at the inner wall of the housing.

Although described with reference to the embodiments above, those skilled in the art will understand that the present invention can be variously modified and changed without departing from the spirit and scope of the invention as set forth in the claims below. Could be.

Claims

Acquiring a signal for a change in illuminance inside the battery pack using a sensor coupled to the battery pack; And

And blocking air flow between the inside and outside of the battery pack through a fire suppression device coupled to the battery pack in response to a signal level recognized according to the change in illuminance.
The method according to claim 1,

The sensor includes an illuminance sensor, wherein the sensor senses a change in illuminance in which the illuminance changes by more than 1 lux in the battery pack or senses a change in resistance in which the resistance is changed to 100 kHz or less. Inhibition method.
The method according to claim 1,

After the blocking step, further comprising the step of forming the inside of the battery pack in a vacuum or vibrating state through the fire suppression device,

The excited air condition includes a state in which the amount of air inside the battery pack is lower than the amount of air in the blocking step.
An input coupled to the battery pack and receiving a signal from a sensor detecting a change in illuminance inside the battery pack;

A control unit coupled to the battery pack and outputting a control signal in response to a signal recognized at the input terminal; And

And a blocking unit for blocking an air flow passage connecting the outside and the inside of the battery pack in response to the control signal.
The method according to claim 4,

The blocking unit includes an air ball pump coupled to the battery pack,

The control unit controls the air ball pump after blocking the inflow of air to form the inside of the battery pack in a vacuum or vibrating state,

The excited air condition includes a state in which the air amount inside the battery pack is lower than the air amount immediately after the air circulation passage is blocked.
The method according to claim 4,

The blocking unit includes a foam injection device coupled to the battery pack,

The foam injection device includes a plurality of nozzles installed adjacent to a plurality of air circulation passages of the battery pack, and is inert and curable on the plurality of air circulation passages through the plurality of nozzles under the control of the controller. A combustion suppression device inside a battery pack, which sprays a foam material containing material to cover the air circulation passages.