Battery box explosion vent

Abstract

This invention relates to the field of battery explosion-proof technology, and more particularly to an explosion-proof device for battery boxes. The explosion-proof device for battery boxes includes: a mounting frame, a fire-resistant expansion plate, a fixing plate, and a protective plate. The battery box is provided with a pressure relief port. The mounting frame is fixed to the box body around the pressure relief port. The fixing plate is connected to the mounting frame. The fire-resistant expansion plate is disposed between the fixing plate and the mounting frame. The mounting frame has a first through hole, the fire-resistant expansion plate has a second through hole, and the fixing plate has a third through hole. The pressure relief port, the first through hole, the second through hole, and the third through hole are sequentially connected. The protective plate is adsorbed onto the fixing plate to seal the third through hole. When the battery box experiences a deflagration, the gas pushes the protective plate through the pressure relief port, the first through hole, the second through hole, and the third through hole, expelling the gas from the box body. When the battery box continues to experience a fire, the fire-resistant expansion plate can expand and seal the second through hole, thus slowing the spread of flames and smoke, preventing the battery box from exploding, and improving the safety of the battery box.

Description

Technical Field

[0001] This invention relates to the field of battery explosion protection technology, and in particular to an explosion relief device for battery boxes. Background Technology

[0002] Currently, the alkaline nickel-cadmium batteries used in urban rail vehicles release hydrogen gas during charging and discharging. Because the batteries are housed in battery boxes with ventilation holes, hydrogen gas can be expelled promptly in a well-ventilated environment. However, when the ventilation holes are blocked, the battery box's ventilation deteriorates, preventing the hydrogen gas from escaping in time. When the hydrogen concentration reaches a certain level, any arc or spark could directly ignite the battery box, causing a serious hazard.

[0003] Therefore, there is an urgent need for a battery box explosion relief device to solve the above-mentioned technical problems. Summary of the Invention

[0004] The purpose of this invention is to provide a battery box explosion relief device that can prevent battery box explosions and improve battery box safety.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A pressure relief device for a battery box includes: a mounting frame, a fire-resistant expansion plate, a fixing plate, and a protective plate. The battery box is provided with a pressure relief port. The mounting frame is fixed to the box body around the pressure relief port. The fixing plate is connected to the mounting frame. The fire-resistant expansion plate is disposed between the fixing plate and the mounting frame. The mounting frame is provided with a first through hole. The fire-resistant expansion plate is provided with a second through hole. The fixing plate is provided with a third through hole. The pressure relief port, the first through hole, the second through hole, and the third through hole are sequentially connected. The protective plate is adsorbed onto the fixing plate to block the third through hole.

[0007] As a preferred technical solution of the above-mentioned explosion venting device for battery box, the protective plate includes a sealing part and an adsorption part. The adsorption part is fixedly connected to the outer periphery of the sealing part. The sealing part is used to block the third through hole, and the adsorption part can adsorb onto the end face of the fixed plate.

[0008] As a preferred embodiment of the aforementioned explosion venting device for a battery box, the pressure exerted on the fixing plate by the adsorption part is 0.1 MPa.

[0009] As a preferred technical solution of the aforementioned explosion venting device for a battery box, the sealing part is made of rubber.

[0010] As a preferred technical solution for the aforementioned explosion venting device for a battery box, the expansion temperature of the fireproof expansion plate is 165°C.

[0011] As a preferred technical solution of the above-mentioned explosion venting device for battery boxes, the expansion ratio of the fireproof expansion plate is not less than 1:50.

[0012] As a preferred technical solution of the above-mentioned explosion venting device for battery boxes, the expansion pressure of the fireproof expansion plate is 1.3 N / mm².

[0013] As a preferred technical solution of the above-mentioned explosion venting device for battery box, the explosion venting device for battery box further includes a plurality of fasteners, which are spaced apart circumferentially along the fixing plate, and the fasteners pass through the fixing plate and are connected to the mounting frame.

[0014] As a preferred technical solution of the above-mentioned explosion venting device for battery boxes, the fixing plate is made of stainless steel.

[0015] As a preferred technical solution for the aforementioned explosion venting device for a battery box, the mounting frame is made of stainless steel.

[0016] Beneficial effects of this invention:

[0017] This invention provides a pressure relief device for a battery box. The device includes a mounting frame, a fire-resistant expansion plate, a fixing plate, and a protective plate. The battery box has a pressure relief port. The mounting frame is fixed to the outer periphery of the pressure relief port. The fixing plate is connected to the mounting frame. The fire-resistant expansion plate is disposed between the fixing plate and the mounting frame. The mounting frame has a first through hole, the fire-resistant expansion plate has a second through hole, and the fixing plate has a third through hole. The pressure relief port, the first through hole, the second through hole, and the third through hole are sequentially connected. The protective plate is attached to the fixing plate to seal the third through hole. Compared to existing technologies, when a deflagration accident occurs in the battery box, the overpressure gas pushes the protective plate through the pressure relief port, the first through hole, the second through hole, and the third through hole, expelling the overpressure gas from the box and preventing damage to the equipment due to overpressure. When a fire continues to occur in the battery box, the fire-resistant expansion plate can expand and seal the second through hole, slowing the spread of flames and smoke, preventing the battery box from exploding, and improving the safety of the battery box. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of the explosion venting device for the battery box and the battery box assembly provided in the embodiment of the present invention;

[0020] Figure 2 This is an exploded view of the structure of the explosion venting device for a battery box provided in an embodiment of the present invention.

[0021] In the picture:

[0022] 1. Mounting frame; 11. First through hole; 2. Fireproof expansion plate; 21. Second through hole; 3. Fixing plate; 31. Third through hole; 4. Protective plate; 5. Battery box; 6. Fasteners. Detailed Implementation

[0023] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0024] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0025] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0026] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0027] like Figure 1 and Figure 2As shown, the present invention provides a battery box explosion venting device. The battery box explosion venting device includes: a mounting frame 1, a fireproof expansion plate 2, a fixing plate 3, and a protective plate 4.

[0028] Specifically, the battery box 5 is provided with a pressure relief port, the mounting frame 1 is fixed to the box body around the pressure relief port, the fixing plate 3 is connected to the mounting frame 1, the fireproof expansion plate 2 is set between the fixing plate 3 and the mounting frame 1, the mounting frame 1 is provided with a first through hole 11, the fireproof expansion plate 2 is provided with a second through hole 21, the fixing plate 3 is provided with a third through hole 31, the pressure relief port, the first through hole 11, the second through hole 21 and the third through hole 31 are connected in sequence, and the protective plate 4 is adsorbed onto the fixing plate 3 to block the third through hole 31. Compared to existing technologies, by using this explosion relief device for the battery box, when a deflagration accident occurs in the battery box 5, the overpressure gas pushes the protective plate 4 through the pressure relief port, the first through hole 11, the second through hole 21 and the third through hole 31 to discharge the overpressure gas out of the box, preventing the battery box 5 from being damaged by overpressure; when the battery box 5 continues to be on fire, the fireproof expansion plate 2 can foam and expand to seal the second through hole 21, which can slow down the spread of flames and smoke, prevent the battery box 5 from exploding and improve the safety of the battery box 5.

[0029] Optionally, the mounting frame 1 has a plurality of first through holes 11 arranged in an array, with m rows along the length of the mounting frame 1 and n columns along the width of the mounting frame 1, where m and n are both integers greater than 1; the fireproof expansion plate 2 has a plurality of second through holes 21 arranged in an array, with m rows along the length of the fireproof expansion plate 2 and n columns along the width of the fireproof expansion plate 2, where m and n are both integers greater than 1; the fixing plate 3 has a plurality of third through holes 31. A plurality of third through holes 31 are arranged in an array, with m rows along the length of the fixing plate 3 and n columns along the width of the fixing plate 3, where m and n are both integers greater than 1. In this embodiment, a plurality of first through holes 11 are arranged in a one-to-one correspondence with a plurality of second through holes 21, and a plurality of second through holes 21 are arranged in a one-to-one correspondence with a plurality of third through holes 31. This arrangement can increase the gas flow area, accelerate the discharge of overpressure gas from the box, and at the same time ensure the strength of the mounting frame 1 and the fixing plate 3, thereby improving the stability of the explosion relief device for the battery box. Of course, in some other embodiments, the number and layout of the first through holes 11, the number and layout of the second through holes 21, and the number and layout of the third through holes 31 are determined according to the actual situation, and will not be elaborated here.

[0030] Optionally, the fire-resistant expansion board 2 is attached to the mounting frame 1 with 3M adhesive to improve the stability of the connection between the fire-resistant expansion board 2 and the mounting frame 1 and prevent the fire-resistant expansion board 2 from separating from the mounting frame 1.

[0031] Optionally, the expansion temperature of the fire-resistant expansion plate 2 is 165℃; the expansion ratio of the fire-resistant expansion plate 2 is not less than 1:50; and the expansion pressure of the fire-resistant expansion plate 2 is 1.3N / mm². With this configuration, the characteristics of the fire-resistant expansion plate 2 ensure that in the event of a fire in the battery box 5, when the temperature continues to rise, the fire-resistant expansion plate 2 can promptly foam and expand to seal the second through hole 21, slowing the spread of flames and smoke, preventing the battery box 5 from exploding, improving the safety of the battery box 5, and ensuring that the battery box 5 does not cause secondary hazards affecting vehicle operation in the event of a fire or explosion, thus meeting the requirements of EN45545-2.

[0032] Optionally, the explosion venting device for the battery box also includes a plurality of fasteners 6, which are spaced apart circumferentially along the fixing plate 3 and pass through the fixing plate 3 to connect with the mounting frame 1. Specifically, the fixing plate 3 is made of stainless steel, one end of the fastener 6 passes through the fixing plate 3 to connect with the mounting frame 1, and the other end of the fastener 6 abuts against the fixing plate 3, so that the fixing plate 3 and the mounting frame 1 are tightly attached. At the same time, the fixing plate 3 and the mounting frame 1 can compress the fireproof expansion plate 2 located between the fixing plate 3 and the mounting frame 1, further improving the stability of the fireproof expansion plate 2 and preventing the fireproof expansion plate 2 from falling off.

[0033] Furthermore, fastener 6 is a bolt.

[0034] Optionally, the mounting frame 1 is made of stainless steel. Specifically, the mounting frame 1 is made of stainless steel plates welded together and welded to the side of the battery box 5, and a bolt sleeve is provided on the back of the mounting frame 1. Fasteners 6 pass through the fixing plate 3 and the mounting frame 1 in sequence and are connected to the bolt sleeve.

[0035] Optionally, the protective plate 4 includes a sealing part and an adsorption part. The adsorption part is fixedly connected to the outer periphery of the sealing part. The sealing part is used to seal the third through hole 31, and the adsorption part can be adsorbed onto the end face of the fixed plate 3. Specifically, the sealing part is made of rubber, and the adsorption part is made of stainless steel. High-strength fibers are added to the sealing part to prevent fragments from being generated during an explosion and to prevent fragments from falling onto the track, thus preventing safety accidents. A permanent magnet is provided inside the adsorption part, which can fix the adsorption part and adsorb it onto the fixed plate 3.

[0036] Furthermore, the pressure on the fixed plate 3 from the adsorption section is 0.1 MPa. Specifically, the outer periphery of the sealing section is adsorbed onto the fixed plate 3, which increases the pressure of the sealing section, improves the sealing performance between the protective plate 4 and the fixed plate 3, and plays a role in dust and water prevention. When the pressure of the overpressure gas reaches 0.1 MPa, it can push the protective plate 4, causing the protective plate 4 to separate from the fixed plate 3, thereby opening the pressure relief port and expelling the overpressure gas from the box.

[0037] Furthermore, the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A battery box explosion venting device, characterized in that, include: The mounting frame (1), fireproof expansion plate (2), fixing plate (3), and protective plate (4) are installed. The battery box (5) is provided with a pressure relief port. The mounting frame (1) is fixed to the box body on the outer periphery of the pressure relief port. The fixing plate (3) is connected to the mounting frame (1). The fireproof expansion plate (2) is set between the fixing plate (3) and the mounting frame (1). The mounting frame (1) is provided with a first through hole (11). The fireproof expansion plate (2) is provided with a second through hole (21). The fixing plate (3) is provided with a third through hole (31). The pressure relief port, the first through hole (11), the second through hole (21), and the third through hole (31) are connected in sequence. The protective plate (4) is adsorbed onto the fixing plate (3) to block the third through hole (31).

2. The explosion venting device for a battery box according to claim 1, characterized in that, The protective plate (4) includes a blocking part and an adsorption part. The adsorption part is fixedly connected to the outer periphery of the blocking part. The blocking part is used to block the third through hole (31). The adsorption part can adsorb onto the end face of the fixed plate (3).

3. A battery box explosion venting device according to claim 2, characterized in that, The pressure exerted on the fixed plate (3) by the adsorption part is 0.1 MPa.

4. A battery box explosion venting device according to claim 2, characterized in that, The sealing part is made of rubber.

5. A battery box explosion venting device according to claim 1, characterized in that, The expansion temperature of the fireproof expansion plate (2) is 165℃.

6. A battery box explosion venting device according to claim 1, characterized in that, The expansion ratio of the fireproof expansion board (2) is not less than 1:

50.

7. A battery box explosion venting device according to claim 1, characterized in that, The expansion pressure of the fireproof expansion plate (2) is 1.3 N / mm².

8. A battery box explosion venting device according to claim 1, characterized in that, The explosion venting device for the battery box also includes a plurality of fasteners (6), which are spaced apart circumferentially along the fixing plate (3) and are connected to the mounting frame (1) through the fixing plate (3).

9. A battery box explosion venting device according to any one of claims 1-8, characterized in that, The fixing plate (3) is made of stainless steel.

10. A battery box explosion venting device according to any one of claims 1-8, characterized in that, The mounting frame (1) is made of stainless steel.

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