TW201338246A - Fire protection device for battery - Google Patents

Abstract

A fire protection device for a battery of the present invention includes: a battery (3) provided with a safety valve (33); a fire protection plate (10) located in the emitting direction of gas; a communicating portion (20) provided on the fire protection plate (10) and communicating a first space in which the battery (3) is provided and a second space located at the opposite side of the first space with referring the fire protection plate (10) as a boundary. The communicating portion (20) has a column-shaped portion and a covering portion; the column-shaped portion protruding from the fire protection plate (10) to at least one of the first space and the second space and being provided with a penetrated hole which communicates the first space and the second space; and the covering portion covering the penetrated hole, which is the protruded side of the column-shaped portion, and the outer circumferential surface of the column-shaped portion, and having a predetermined clearance between the column-shaped portion and the covering portion.

Description

Battery fire protection device

The present invention relates to a fire protection device for a battery.

The present application claims priority to Japanese Patent Application No. 2012-028071, filed on Jan.

The battery has a primary battery that discharges only and a secondary battery that performs charging and discharging. In recent years, lithium secondary batteries having characteristics of high energy density, high output, and long life have been attracting attention as secondary batteries. In general, a lithium secondary battery is configured such that a laminated electrode body in which an electrode plate, that is, a positive electrode plate and a negative electrode plate are laminated via a separator, is sealed in a battery container together with an electrolytic solution or the like.

When a battery such as a lithium secondary battery is abnormal, such as a short circuit or an overcharge, a large amount of high-temperature gas is generated in the battery container due to rapid vaporization of the electrolyte, and the internal pressure of the battery container rises sharply. Causes the battery container body to rupture. Therefore, when the internal pressure of the battery container becomes a specific value or more, the battery container can be prevented from being broken by the safety valve that discharges the gas in the battery container to the outside.

Here, for example, when a plurality of batteries are housed in one case and used as a large-capacity power source, if the casing itself has airtightness, the gas is sealed inside the casing and becomes a gas-filled state. The risk of rupture of the body itself is also high.

In this regard, Patent Document 1 discloses a technique in which a housing for housing a battery is provided. A gas flow path leading to the outside, such as an exhaust pipe and an opening, is provided, and the gas generated from the safety valve of the battery is discharged to the outside of the casing through the gas flow path to improve the safety of the casing.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2011-70871

However, there is also a case where the gas discharged from the safety valve of the battery is accompanied by a fire. In this case, if the gas flow path from the exhaust pipe to the opening portion is formed linearly as in the technique of Patent Document 1, the following problems occur. At the point, the fire is easily ejected from the opening through the exhaust pipe, which may cause a fire such as an object disposed around the casing.

Accordingly, the present invention has been made in view of the above problems, and an object thereof is to provide a novel fire prevention device for a battery, which can be self-configured with a battery even if a battery generates an abnormality and generates gas from a safety valve of the battery. The space is removed, and even if a gas accompanying the fire is generated, the fire can be enclosed in the space in which the battery is disposed, and the object around the battery can be prevented from being fired.

The fireproof device for a battery according to the present invention includes: a battery having a valve for discharging the internal gas of the battery container to the outside of the battery container when the internal pressure of the battery container becomes a specific value or more; and the fireproof plate disposed at least in the discharge of the gas a communicating portion configured to connect a first space of the battery and a second space opposite to the first space by a fireproof board; and the connecting portion comprises: a columnar portion, the fireproof plate is directed to the first space And at least one of the second spaces protruding, and having a through hole connecting the first space and the second space; and a covering portion having a specific gap with the columnar portion and penetrating from the side protruding from the columnar portion The hole covers the outer peripheral surface of the columnar portion.

In the fire prevention device for a battery of the present invention, the flow path from the first space to the second space of the gas discharged from the safety valve of the battery is a stepped structure, so that even in the case of a gas accompanying the fire, The fire is suppressed from being ejected to the outside, and as a result, the fire can be enclosed in the space in which the battery is disposed, thereby preventing the object around the battery from being fired.

Further, the communication portion may be disposed at a specific distance from a region of the fire prevention panel located in the discharge direction of the gas.

Moreover, the fireproof board may be used as a top plate and a side plate constituting a casing for accommodating the battery, and the communication portion may be provided in the vicinity of the top plate above the side plate.

Further, the opening portion may be provided below the gravity portion in the covering portion.

Moreover, the fireproof panel, the side portion of the columnar portion, and the covering portion may each be a steel sheet and have a specific thickness.

Further, a gap between the columnar portion and the covering portion in the communicating portion may be equal to or larger than a size of a wire that can be electrically connected to an electrode terminal of the battery.

According to the fire prevention device for a battery of the present invention configured as described above, even if the battery generates an abnormality and gas is generated from the safety valve of the battery, the gas can be removed from the space in which the battery is disposed, and even if it is accompanied by a fire In the case of a gas, the fire can also be enclosed in a space in which the battery is disposed, thereby preventing a fire in an object surrounding the battery.

1, 1 '‧‧‧ shell

3‧‧‧Battery

10‧‧‧ fire board

10a‧‧‧ top board

10b‧‧‧ side panels

10c‧‧‧floor

10d‧‧‧ fire board (middle shelf)

20, 20'‧‧‧Connecting Department

21, 21'‧‧‧ columnar

21a‧‧‧ end face

21b‧‧‧ end face

22, 22'‧‧‧ Coverage

31‧‧‧ container body

32‧‧‧electrode terminal

32A‧‧ positive terminal

32B‧‧‧Negative terminal

33‧‧‧Safety valve

40a‧‧‧Lower shelf

40b‧‧‧Upper shelf

211‧‧‧ joints

221‧‧‧ Main body

222‧‧‧ joints

223‧‧‧ openings

223'‧‧‧ openings

Fig. 1 is a schematic perspective view showing a fire prevention device for a battery according to a first embodiment of the present invention.

Fig. 2 is a schematic perspective view showing a battery in the first embodiment of the present invention.

3A is a schematic configuration view of a communication portion of a part of the battery fire prevention device according to the first embodiment of the present invention, and is a cross-sectional view of the gravity direction (Z-axis direction) of the cover portion.

Figure 3B is a cross-sectional view taken along line AA' of Figure 3A.

Fig. 4 is a view showing the fire prevention of the battery fire prevention device according to the first embodiment of the present invention.

Fig. 5 is a schematic perspective view showing a battery fire prevention device according to a second embodiment of the present invention.

Fig. 6A is a schematic structural view showing a communication portion of a part of the battery fire prevention device according to the second embodiment of the present invention, and is a cross-sectional view of the gravity direction (Z-axis direction) of the cover portion.

Figure 6B is a cross-sectional view taken along line BB' of Figure 6A.

Fig. 7 is a schematic perspective view showing a modification of the present invention and showing a case where a battery fire prevention device is configured as a shelf.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

<First embodiment>

Fig. 1 is a schematic perspective view showing a battery fire prevention device as a casing, Fig. 2 is a schematic perspective view showing the battery 3, and Fig. 3 is a schematic configuration view showing a communication portion 20 as a part of the battery fire prevention device.

As shown in FIG. 1, the casing 1 of the first embodiment of the present invention accommodates a plurality of batteries 3, and includes: a fireproof panel 10 (10a to 10c) surrounding the batteries 3; and a communication portion 20, which is provided The fireproof panel 10 is connected to the space inside the casing 1 and the space outside the casing 1. A fire protection device for a battery of this embodiment including the fireproof panel 10 and the communication portion 20 is formed.

Hereinafter, the battery 3 will be briefly described, and then the battery fire prevention device of the present embodiment will be described.

The battery 3 is, for example, a lithium secondary battery. As shown in FIG. 2, the battery 3 includes a container body 31, two electrode terminals 32 (a positive electrode terminal 32A and a negative electrode terminal 32B), and a safety valve 33.

The container main body 31 is a container in which a laminated electrode body (not shown) in which an electrode plate, that is, a positive electrode plate and a negative electrode plate are laminated via a separator, is sealed together with a non-aqueous electrolyte solution, and the like. For example, it is formed of a metal material such as an aluminum alloy. A positive electrode lead plate is formed at one end of the positive electrode plate, and the positive electrode lead plate is electrically connected to the positive electrode terminal 32A by a positive electrode lead wire. Further, a negative electrode lead plate is formed at one end of the negative electrode plate, and the negative electrode lead plate and the negative electrode terminal 32B are formed. The negative lead wires are electrically connected. According to the above configuration, current can be drawn from the positive electrode terminal 32A and the negative electrode terminal 32B.

The positive electrode terminal 32A and the negative electrode terminal 32B are exposed to the outside through a through hole formed in the lid portion of the container body 31, and are electrically insulated from the container body 31 by the positive electrode terminal 32A and the negative electrode terminal 32B, and are insulated from the container body 31. The resin is adhered to the container body 31 integrally.

The safety valve 33 is configured to prevent a large amount of high-temperature gas from being generated inside the container body 31 due to an abnormal vaporization or the like of the battery 3, and is caused by an increase in internal pressure. The valve in which the container body 31 is broken opens when the internal pressure of the container body 31 becomes a certain value or more, and the gas in the battery container is discharged to the outside. Further, the structure and shape of the safety valve 33 can be the same as the various safety valves provided on the previous battery.

Next, the casing 1 will be described. The casing 1 is formed by including the fireproof plate 10 and the communicating portion 20 as described above.

As shown in FIG. 1, the fireproof panel 10 is used as a top plate 10a, four side plates 10b, and a bottom plate 10c which accommodate the case (accommodation case) 1 of a plurality of batteries 3. The fireproof panel 10 is a panel for sealing the fire inside the casing 1 in case the safety valve 33 of the battery 3 is opened and generates a gas accompanying the fire, preventing the fire from being ejected to the casing 1. external. The fireproof panel 10 can be, for example, a steel sheet having a thickness of 1.6 mm or more, but the thickness and the material are not limited thereto. When a gas accompanying a fire is generated from a safety valve, the thickness of the fire resistance is appropriately selected. And the material can be.

In addition, the following description is suitably performed using an XYZ orthogonal coordinate system. In the casing 1, for example, as shown in FIG. 1, the vertical direction (gravity direction) from the bottom plate 10c of the casing 1 toward the top plate 10a of the casing 1 is set to the +Z direction in the Z-axis direction, and the Z-axis is Direction orthogonal and regular The direction in which the plurality of batteries 3 are arranged in the line is set to the Y-axis direction, and the direction orthogonal to the Y-axis direction and the Z-axis direction is set to the X-axis direction. Further, the internal space of the casing 1 (the space in which the battery is disposed) is referred to as the first space, and the external space of the casing 1 (the space on the opposite side of the first space from the fireproof panel 10) is defined as Two spaces.

The communication portion 20 is provided at a specific position of the top plate 10a, and as shown in FIG. 3, includes a columnar portion 21 and a cover portion 22. Further, the specific position of the top plate 10a is, for example, as shown in FIG. 4, in the region of the fireproof panel 10a (in the +Z direction) of the gas which is opened and discharged by the safety valve 33 of the battery 3 (located in the self-safety valve) The area of the +Z direction of 33) is a position above a certain distance d. In this case, it is preferable that even when the gas accompanying the fire is generated from the safety valve 33, the plane portion of the fireproof plate 10a is located in the discharge direction of the gas, thereby more reliably preventing the fire from flowing out to external.

As shown in FIG. 3, the columnar portion 21 is a hollow columnar portion which protrudes toward the second space side (+Z direction) at the specific position of the top plate 10a, and the end faces 21a and 2 of the first space side. The end surface 21b on the space side penetrates. That is, the columnar portion 21 has a through hole that connects the first space and the second space. In FIG. 3, the shape of the columnar portion 21 is a columnar shape, but the shape is not limited thereto, and may be a triangular prism shape or a quadrangular prism shape. Further, the outer peripheral portion of the columnar portion 21 is provided with a joint portion 211 which is joined to the joint portion 222 of the cover portion 22 to be formed, for example, a male thread formed on the outer peripheral surface. Further, the columnar portion 21 can be formed, for example, by providing a through hole in the top plate 10a and attaching a hollow columnar member to the periphery of the through hole. In addition, the columnar portion 21 is formed of, for example, a steel plate, and the thickness from the inner circumferential surface to the outer circumferential surface is 1.6 mm or more. However, the thickness and the material are not limited thereto, and the gas is generated from the safety valve 33. The thickness and material of the fire resistance of the fire may be appropriately selected.

The covering portion 22 has a specific gap with the columnar portion 21, and covers the portion from the end surface 21b of the second space side of the columnar portion 21 to the outer peripheral surface of the columnar portion 21. Further, the cover is applied to the outer peripheral surface of the columnar portion 21, for example, the columnar portion 21 is directed to the second space side. When the (+Z direction) is protruded, the lower end portion of the covering portion 22 (the portion where the opening portion 223 is provided below) is located closer to the -Z direction than the end surface 21b of the second space side of the columnar portion 21. The entire outer peripheral surface may be covered, and the lower end portion of the covering portion 22 may be in contact with the top plate 10a, or may be covered from the end surface 21b to the outer peripheral surface in the -Z direction, and the lower end portion of the covering portion 22 may not abut against the top plate 10a. 3A is a cross-sectional view of the communicating portion 20 in the direction of gravity (Z-axis direction), showing that the covering portion 22 covers the outer peripheral surface of the columnar portion 21 in the -Z direction from the end surface 21b, and the lower end portion of the covering portion 22 does not An example of a case where the top plate 10a abuts.

The covering portion 22 includes a main body portion 221 that guides the gas discharged from the safety valve 33 of the battery 3 and passing through the inside of the columnar portion 21 from the first space along the outer peripheral surface of the columnar portion 21, and is convenient for the self-safety valve. In the case of a fire, it is also possible to prevent the fire from being ejected to the outside; the joint portion 222 is for engaging with the joint portion 211 of the columnar portion 21. The shape of the inner wall of the main body portion 221 (the surface facing the outer circumference of the columnar portion 21) is such that the gas passing through the inside of the columnar portion 21 from the first space can be guided along the outer peripheral surface of the columnar portion 21, For example, it may be formed in a dome shape. Further, the main body portion 221 of the covering portion 22 is formed of, for example, a steel plate, and the thickness from the inner wall surface to the outer wall surface (the surface on the second space side) is 1.6 mm or more. However, the thickness and the material are not limited thereto. When the valve 33 generates a gas accompanying the fire, the thickness and material having heat resistance to the fire may be appropriately selected. On the other hand, for example, when the joint portion 211 is a male screw, the joint portion 222 is a female screw that is screwed to the male screw. Further, the joint portion 222 of the joint portion 211 of the columnar portion 21 and the cover portion 22 is not limited to the case where the male thread and the female thread are joined, and other joining methods may be used, and for example, welding joining may be employed.

The cover portion 22 further has an opening portion 223 that discharges gas guided from the first space through the inside of the columnar portion 21 and the gap between the inner wall of the cover portion 22 and the outer peripheral surface of the columnar portion 21 To the second space. Specifically, the opening 223 is provided at a position closer to the Z direction than the end surface 21b of the columnar portion 21 (a position lower than the end surface 21b in the direction of gravity) (hereinafter referred to as "step structure"). For example, as shown in FIG. 3A, the columnar portion 21 is covered with the lower end portion of the covering portion 22 and is not disposed to abut against the surface of the top plate 11. In the cross-sectional view of the XY plane of FIG. 3B, the opening 223 is formed to open in the Z-axis direction along the shape of the outer peripheral surface of the columnar portion 21 excluding the portion connecting the main body portion 221 and the joint portion 222. In addition, when the cover portion 22 is disposed so as to cover the outer peripheral surface of the columnar portion 21 and abut against the surface of the top plate 11, the opening portion 223 is attached to the XY plane near the top plate 10a side of the cover portion 22. The direction is formed by the opening.

The width of the gap between the covering portion 22 and the columnar portion 21 and the opening area of the opening portion 223 can be appropriately set in consideration of the size of the casing 1 and the amount of gas generated from the safety valve 33 of the battery 3, for example, The size of the wire connected to the electrode terminal 32 of the battery 3 is set to be slightly larger than the wire to set the opening area. In this case, there is no need to separately provide a hole for taking out the wire to the outside of the casing 1 in the casing 1, and there is an advantage in that the manufacturing cost is reduced.

According to the battery fire-prevention apparatus of the present embodiment, the casing 1 has the following step structure, that is, the gas discharged from the safety valve 33 of the battery 3 passes through the column from the first space through the flow path. The inside of the portion 21 is guided and discharged to the second space along the outer peripheral surface of the columnar portion 21, so that even if the battery 3 is abnormal and gas is generated from the safety valve 33 of the battery 3, the gas can be self-configured with the battery. The first space of 3 is removed, and even if a gas accompanying the fire is generated, as shown in FIG. 4, the fire can be prevented from flowing out to the outside by the covering portion 22, thereby preventing the object around the battery 3 from being generated. Fire.

<Second embodiment>

Next, a battery fire prevention device according to a second embodiment of the present invention will be described in detail. The case 1 of the first embodiment is configured such that the communication portion 20 is provided on the top plate 10a. However, one of the features of the case 1' of the second embodiment is as shown in Fig. 5, and is provided on the side plate 10b. The communication portion 20 is a communication portion 20' having substantially the same configuration. In the following description, the configuration common to the first embodiment will be omitted as appropriate.

The communication portion 20' is provided in the vicinity of the top plate 10a of the side plate 10b. By providing the communication portion 20' in the vicinity of the top plate 10a, the top plate 10a can be used to reliably prevent the safety valve 33 from the battery 3 from being discharged. The gas is discharged, and it is easy to discharge the gas accumulated in the upper portion of the casing 1 to the outside. Further, the position at which the side plate 10b of the communication portion 20' is provided can be appropriately changed in accordance with the specific gravity of the gas which may be generated.

The columnar portion 21' of the communicating portion 20' is a hollow cylindrical portion. As shown in FIG. 6A, the columnar portion 21' of the communicating portion 20' protrudes toward the second space side (+X direction) in the vicinity of the top plate 10a of the side plate 10b, and penetrates in the X-axis direction. An end surface 21a on the space side and an end surface 21b on the second space side. Further, the shape of the columnar portion 21' itself may be the same as that of the columnar portion 21 described in the first embodiment.

The covering portion 22' of the communicating portion 20' has a specific gap with the columnar portion 21', and covers the outer peripheral surface of the columnar portion 21' from the end surface 21b of the second space side of the columnar portion 21'. Part. The cover portion 22' may basically have the same shape as the cover portion 22 described in the first embodiment, and the opening portion 223' may be provided only in the cover portion 22' as shown in FIGS. 6A and 6B. The position of the columnar portion 21' is further below (in the direction of gravity), and the opening portion 223' passes through the inside of the columnar portion 21' and the periphery of the columnar portion 21' from the first space of the self-covering portion 22'. The gas guided by the surface is discharged to the second space. Specifically, the opening 223' is provided at a position closer to the -Z direction than the end surface 21b of the columnar portion 21' (a position lower than the end surface 21b in the direction of gravity). For example, as shown in FIG. 6A, the cover portion 22' is disposed so as to cover the columnar portion 21' without abutting against the surface of the side plate 10b, and the opening portion 223' is shown in a sectional view of the YZ plane of FIG. 6B. The position of the connection portion between the main body portion 221 and the joint portion 222 is lower than the position of the columnar portion 21' (the direction below the gravity direction (-Z direction), along the outer peripheral surface of the columnar portion 21 and in the X-axis direction. Opening. The opening 223' is provided only below the position of the columnar portion 21', and even if the fire discharged from the safety valve 33 of the battery 3 passes through the through hole of the columnar portion 21', and the fire is intended to travel upward, It is also blocked by the covering portion 22' and cannot travel. In this case, a gaseous substance such as a gas can be discharged to the second space via the opening portion 223', which is useful in this respect.

According to the battery fire prevention device of the present embodiment, the communication portion 20' is provided In addition to the effect of the battery fire prevention device of the first embodiment described above, in addition to the effect of the fire prevention device for a battery according to the first embodiment, the top plate 10a of the cover portion 22 can be surely used by the top plate 10a of the cover portion 22 in addition to the effect of the fire prevention device for a battery according to the first embodiment. The fire is prevented from being ejected to the outside, and even if the fire propagates in the direction of the side plate 10b along the plane of the top plate 10a, the fire can be prevented from being ejected to the outside by the covering portion 22' provided in the communicating portion 20' provided on the side plate 10b. It is sure to prevent a fire from an object around the battery 3.

Further, by providing the communication portion 20' in the vicinity of the top plate 10a on the side plate 10b, it is a structure that is easily discharged to the outside even if gas is generated, and the opening portion 223' is disposed below the gravity direction in the cover portion 22'. It is possible to more reliably prevent the fire which is also spread in the direction of the side plate 10b from being ejected to the outside.

<variation>

As described above, the preferred embodiments of the fire protection device for a battery of the present invention have been described. However, it is to be understood by those skilled in the art that the present invention is not limited to the above embodiments and can be expressed without departing from the scope of the claims. In the case of the idea and scope, various changes, additions, and omissions are made.

For example, in each of the above-described embodiments, the battery fire-proof device that houses the casings 1 and 1' of the battery 3 will be described as an example, but the present invention is not limited thereto. For example, a battery fire prevention device can also be used as a shelf. Specifically, the battery 3 is disposed on a shelf (lower shelf), and further has a shelf (upper shelf) above the battery 3, and a battery 3 or other object is also disposed on the upper shelf. In the case of the case, the upper shelf may also be used as a fireproof panel, and the communication portion 20 may be provided on the fireproof panel. As a result, even if a gas accompanying the fire is generated from the safety valve 33 of the battery 3, it is possible to prevent the fire from being ejected to the space above the boundary between the fireproof plate and the communication portion, thereby suppressing the arrangement on the upper shelf. A fire has occurred in the battery or other object.

Moreover, as shown in FIG. 7, a fireproof panel 10d may be separately provided as an intermediate shelf between the shelf 40a under the battery 3 and the shelf battery 40b and other objects above the shelf 40b, and the fireproof panel 10d and upper The shelf 40b serves as a gas flow path. In this case, no need The high-temperature gas is discharged to the space of the upper shelf 40b where the battery 3 or other object is disposed, and even if the gas accompanying the fire is generated from the safety valve 33 of the battery 3, the fire does not directly reach the shelf on which the battery 3 or other object is disposed. 40b, the temperature of the space in which the battery and other objects are placed in the upper shelf 40b can be prevented from rising. As a result, it is possible to avoid the occurrence of an abnormal chain reaction in which the battery 3 disposed on the upper shelf 40b generates heat and the internal pressure rises to open the safety valve 33.

In the above-described embodiments, the case where the columnar portions 21 and 21' of the communicating portions 20 and 20' protrude toward the second space side will be described as an example. However, the present invention is not limited thereto and may be connected. The columnar portions 21, 21' of the portions 20, 20' respectively protrude toward the first space side. In this case, the covering portions 22 and 22' have a specific gap with the columnar portion 21, and cover the outer peripheral surface of the columnar portion 21 from the end surface 21a of the first space side of the columnar portion 21, The gas discharged from the safety valve 33 of the battery 3 and guided through the openings 223, 223' from the first space and guided along the inner wall of the cover portion 22 passes through the inside of the columnar portion 21 and is discharged to the second space. Further, the columnar portions 21 and 21' of the communicating portions 20 and 20' may be protruded toward both of the first space side and the second space side. In this case, the covering portion may be provided on either side of the protruding portion. 22, 22', the cover portions 22, 22' may also be provided on the protruding sides of both sides.

Further, in the first embodiment described above, the case where the communication portion 20 is provided at a position separated from the region of the fire prevention panel 10a located in the discharge direction of the gas is described as an example, but the present invention is not limited thereto. For example, the length (length in the Z-axis direction) in which the columnar portion 21 protrudes has a considerable length, and may be provided in the discharge direction as long as the covering portion 22 sufficiently covers the outer peripheral surface of the columnar portion 21.

Further, in each of the above embodiments, a lithium secondary battery is particularly exemplified as a battery. However, the present invention is not limited thereto, and a battery provided with a safety valve can of course be applied to other batteries.

[Industrial availability]

The fireproof device for a battery of the present invention comprises: a battery having a battery container When the partial pressure is equal to or higher than a specific value, the internal gas of the battery container is discharged to the outside of the battery container; the fireproof plate is disposed at least in the discharge direction of the gas; and the communication portion is disposed on the fireproof plate and is connected to the battery. a first space and a second space that is opposite to the first space by a fireproof panel; and the communication portion includes: a columnar portion that protrudes from the fireproof panel to at least one of the first space and the second space And a through hole that connects the first space and the second space; the cover portion has a specific gap with the columnar portion, and the through hole that protrudes from the side of the columnar portion covers the outer peripheral surface of the columnar portion.

In the fire prevention device for a battery of the present invention, since the flow path from the first space to the second space of the gas discharged from the safety valve of the battery is a stepped structure, even if a gas accompanying the fire is generated, the fire can be suppressed. The fire is ejected to the outside, and as a result, the fire can be enclosed in a space in which the battery is disposed, thereby preventing an object from being fired around the battery.

1‧‧‧shell

3‧‧‧Battery

10‧‧‧ fire board

10a‧‧‧ top board

10b‧‧‧ side panels

10c‧‧‧floor

20‧‧‧Connecting Department

33‧‧‧Safety valve

Claims (9)

A fire prevention device for a battery, comprising: a battery having a valve for discharging an internal gas of the battery container to an outside of the battery container when a pressure inside the battery container is equal to or greater than a specific value; at least a fireproof plate And a communication portion provided in the fireproof plate, and a first space in which the battery is disposed and a second space on a side opposite to the first space by the fireproof plate; and The communication portion includes a columnar portion that protrudes from at least one of the first space and the second space from the fireproof plate, and has a through hole that connects the first space and the second space; and covers The portion has a specific gap with the columnar portion, and the through hole from the protruding side of the columnar portion covers the outer peripheral surface of the columnar portion. The battery fire prevention device according to claim 1, wherein the communication portion is disposed at a specific distance from a region of the fire prevention plate located in a discharge direction of the gas. The fire protection device for a battery according to claim 1, wherein the fireproof plate is used as a top plate and a side plate constituting a casing for accommodating the battery, and the communication portion is provided in the vicinity of the top plate on the side plate. The fire protection device for a battery according to claim 2, wherein the fireproof plate is used as a top plate and a side plate constituting a casing for accommodating the battery, and the communication portion is provided in the vicinity of the top plate on the side plate. The fire protection device for a battery according to claim 3, wherein the opening portion is provided below the gravity direction of the covering portion. The fire protection device for a battery according to claim 4, wherein the opening portion is provided below the gravity direction of the covering portion. The fire protection device for a battery according to any one of claims 1 to 6, wherein the fireproof plate, the side portion of the columnar portion, and the covering portion are each a steel plate and have a specific thickness. The fire protection device for a battery according to any one of claims 1 to 6, wherein a gap between the columnar portion and the covering portion in the communication portion is a size of a wire electrically connectable to an electrode terminal of the battery the above. The battery fire prevention device according to claim 7, wherein a gap between the columnar portion and the covering portion in the communication portion is equal to or larger than a size of a wire electrically connectable to an electrode terminal of the battery.