Battery box with automatic fire extinguishing device

Abstract

A battery box with an automatic fire extinguishing device comprises a box main body, a lithium battery module arranged in the box main body, an upper cover arranged on the box main body and the automatic fire extinguishing device arranged on the upper cover and between the upper cover and the box main body, and the automatic fire extinguishing device comprises a shell main body, a fire extinguishing bag, a thermosensitive line and a sealing layer. The shell main body is provided with two first side plates which are oppositely arranged, two second side plates which are oppositely arranged and two cover plates which are oppositely arranged, the first side plates, the second side plates and the two cover plates define an inner space, flow guide holes are formed in the two second side plates, and the sealing layers are fixed on the inner side surfaces of the second side plates and seal the flow guide holes. The sealing layer is provided with a weakening line, the size of an area defined by the weakening line is smaller than that of an opening of the flow guide hole, and the weakening line of the sealing layer is opposite to the flow guide hole. The sealing layer is arranged, the weakening line is arranged on the sealing layer, in the normal state, the sealing layer seals the shell body and protects the fire extinguishing bag, aerosol generating agents of the fire extinguishing bag keep active, and when fire extinguishing is triggered, internal air pressure rushes through the weakening line of the sealing layer, and aerosol fire extinguishing substances are sprayed out from the flow guide holes. The use effect of the automatic fire extinguishing device is effectively guaranteed, and the qualified rate of products is improved.

Description

Technical Field

[0001] The utility model relates to a battery device, in particular to a battery box with an automatic fire extinguishing device. Background Art

[0002] Lithium-ion batteries are secondary batteries (rechargeable batteries) that rely primarily on the movement of lithium ions between the positive and negative electrodes. During the charge and discharge process, Li+ is intercalated and deintercalated between the two electrodes. During charging, Li+ is deintercalated from the positive electrode and then intercalated into the negative electrode through the electrolyte, leaving the negative electrode in a lithium-rich state. The reverse occurs during discharge.

[0003] Battery boxes equipped with lithium-ion batteries present a risk of short circuits during use. This generates significant heat, potentially causing the entire battery box to combust. Failure to extinguish the fire in a timely manner can lead to even greater problems. To address this issue, some manufacturers install fire extinguishing devices inside the battery box. These devices are equipped with nozzles for dispensing fire-extinguishing substances. As shown in patent CN 118079277A, the nozzles on existing fire extinguishing devices are often sealed with a membrane. This membrane is then punctured to open the nozzles. However, this requires a high level of force, which can lead to failure and compromise the effectiveness of the extinguishing process. Utility Model Content

[0004] Based on this, it is necessary to provide a battery box with an automatic fire extinguishing device to address the deficiencies in the existing technology.

[0005] A battery box with an automatic fire extinguishing device, comprising a box body, a lithium battery module arranged in the box body, an upper cover mounted on the box body, and an automatic fire extinguishing device mounted on the upper cover and arranged between the upper cover and the box body, the automatic fire extinguishing device comprising a shell body, a fire extinguishing bag, a heat-sensitive wire and a sealing layer, the shell body being provided with two first side panels arranged opposite to each other, two second side panels arranged opposite to each other and two cover plates arranged opposite to each other, the first side panels, the second side panels and the two cover plates enclosing an inner space, the two second side panels being provided with guide holes, the sealing layer being fixed to the inner side surfaces of the second side panels and sealing the guide holes, the sealing layer being provided with a weakening line, the area enclosed by the weakening line being smaller than the orifice size of the guide hole, the weakening line of the sealing layer being arranged opposite to the guide hole.

[0006] In one embodiment, the shell body is further provided with two fixing plates, which are arranged opposite to each other and parallel to each other, and the main axis extension direction of the fixing plates is opposite to the two second side plates, and the fire extinguishing bag is fixedly installed between the two fixing plates.

[0007] In one embodiment, one side of the fixing plate is connected to one of the cover plates, and the other side of the fixing plate is in contact with the other cover plate.

[0008] In one embodiment, an auxiliary head is provided on one of the first side panels of the shell body, and a through-hole is provided on the auxiliary head which penetrates from the outside to the inside. The through-hole also penetrates the first side panel and is connected to the inner space, and the thermal line extends from the through-hole.

[0009] In one embodiment, the thermal wire includes a first trigger segment, a second trigger segment connected to the first trigger segment, and two third trigger segments connected to both ends of the second trigger segment. One end of the first trigger segment passes through the through hole and extends to the outside of the shell body. The outer wall of the first trigger segment is in contact with the hole wall of the through hole, and the other end of the first trigger segment extends into the inner space.

[0010] In one embodiment, the second trigger section is disposed between the fixing plate on the side close to the through hole and the first side plate.

[0011] In one embodiment, the two third trigger sections of the thermal line are respectively connected to two sides of the fire extinguishing bag.

[0012] In one embodiment, the path of the weakening line is one of a circle, a square, a triangle, and a hexagon.

[0013] The battery case with an automatic fire extinguishing device of this utility model has the following beneficial effects: by providing a sealing layer with a weakened line in the sealing layer, the sealing layer seals the case body and protects the fire extinguishing bag in normal operation, keeping the aerosol generating agent in the fire extinguishing bag active. When the fire extinguishing device is triggered, the internal air pressure breaks the weakened line in the sealing layer, causing the aerosol fire extinguishing agent to be ejected from the diversion hole. This utility model effectively ensures the effectiveness of the automatic fire extinguishing device and improves the product qualification rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a structural diagram of a battery box with an automatic fire extinguishing device according to the utility model;

[0015] Figure 2 for Figure 1 The diagram shows the structure of the battery box with automatic fire extinguishing device when the upper cover is opened.

[0016] Figure 3 This is a schematic diagram of the structure of the automatic fire extinguishing device of the utility model;

[0017] Figure 4 for Figure 3 A cross-sectional view of the automatic fire extinguishing device shown;

[0018] Figure 5 This is a schematic structural diagram of the sealing layer of the present invention. DETAILED DESCRIPTION

[0019] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, the following detailed description of specific embodiments of the present invention is provided in conjunction with the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0020] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0022] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0023] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0024] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0025] See also Figures 1 to 5 The present invention provides a battery box with an automatic fire extinguishing device, including a box body 20, a lithium battery module (not shown) arranged in the box body 20, an upper cover 10 installed on the box body 20, and an automatic fire extinguishing device 30 installed on the upper cover 10 and arranged between the upper cover 10 and the box body 20. In this embodiment, the automatic fire extinguishing device 30 is an aerosol fire extinguisher.

[0026] The automatic fire extinguishing device 30 includes a shell body 31, a fire extinguishing bag 33, a heat-sensitive wire 32, and a sealing layer 34. The material in the fire extinguishing bag 33 is an aerosol generating agent. The shell body 31 is provided with two opposing first side panels 311, two opposing second side panels 312, and two opposing cover panels 313. The first side panels 311, the second side panels 312, and the two cover panels 313 together enclose an inner space 35. The shell body 31 is also provided with two fixing plates 314. The two fixing plates 314 are arranged opposite and parallel to each other. The main axis of the fixing plates 314 extends in a direction opposite to the two second side panels 312. One side of the fixing plate 314 is connected to one of the cover panels 313, and the other side of the fixing plate 314 is in contact with the other cover panel 313. The fire extinguishing bag 33 is fixedly mounted between the two fixing plates 314. The two second side plates 312 are provided with guide holes 315 , and the sealing layer 34 is fixed to the inner side surface of the second side plates 312 by gluing or other means and seals the guide holes 315 .

[0027] The sealing layer 34 is provided with a weakening line 341, which is processed on the sealing layer 34 by laser processing. The thickness of the sealing layer 34 along the path of the weakening line 341 is relatively thin, which makes the sealing layer 34 easily broken when it is squeezed by air pressure. In this embodiment, the path of the weakening line 341 is set in a circular shape. In other embodiments, the path of the weakening line 341 can also be set in a square, triangular, or hexagonal shape. The area enclosed by the weakening line 341 is smaller than the orifice size of the guide hole 315. When the sealing layer 34 is fixed to the second side plate 312, the weakening line 341 of the sealing layer 34 is set relative to the guide hole 315.

[0028] An auxiliary head 316 is provided on one of the first side panels 311 of the shell body 31. This auxiliary head 316 has a through-hole 317 extending from the outside to the inside. This through-hole 317 also penetrates the first side panel 311 and communicates with the inner space 35. The thermal line 32 includes a first triggering section 321, a second triggering section 322 connected to the first triggering section 321, and two third triggering sections 323 connected to either end of the second triggering section 322. One end of the first triggering section 321 passes through the through-hole 317 and extends outside the shell body 31. The outer wall of the first triggering section 321 abuts against the wall of the through-hole 317, while the other end of the first triggering section 321 extends into the inner space 35. The second triggering section 322 is located between the fixing plate 314 and the first side panel 311, near the through-hole 317. The two third triggering sections 323 are connected to either side of the fire extinguishing bag 33.

[0029] When a short circuit in the lithium battery module within the housing 20 causes a fire, the high temperature or open flame ignites the first trigger segment 321 of the thermal wire 32, which in turn ignites the second and third trigger segments 322 and 323, activating the aerosol generator within the automatic fire extinguishing device 30. The aerosol generator, through a redox reaction, instantly releases a large amount of aerosol fire extinguishing material, rapidly increasing the pressure within the interior space 35 of the housing 31. Under the action of this pressure, the weakened line 341 of the sealing layer 34 is breached, and a large amount of aerosol fire extinguishing material is ejected from the guide holes 315 and perforations 317 to extinguish the fire. The metal oxides and carbonates in the aerosol fire extinguishing agent undergo endothermic decomposition. The vaporized metal ions (such as Sr, K, and Mg) or the electron-depleted cations produced by the decomposition of the aerosol fire extinguishing agent exist as vapor, undergoing multiple chain reactions with the active groups H·, ·OH, and O· in the combustion. This process is repeated, consuming a large amount of the active groups in the combustion, continuously reducing their concentration and suppressing combustion. At the same time, the solid particles in the thermal aerosol fire extinguishing agent can adsorb the chain reaction intermediates ·OH, H· and O·; and catalyze them to recompose stable molecules, thereby interrupting the branch chain reaction of the combustion process.

[0030] The battery box with an automatic fire extinguishing device of the present invention has the following beneficial effects: by providing a sealing layer 34 and providing a weakening line 341 on the sealing layer 34, under normal conditions, the sealing layer 34 seals the shell body 31 and protects the fire extinguishing bag 33, so that the aerosol generating agent of the fire extinguishing bag 33 remains active. When the fire extinguishing is triggered, the internal air pressure breaks the position of the weakening line 341 of the sealing layer 34, so that the aerosol fire extinguishing material is ejected from the guide hole 315, effectively ensuring the use effect of the automatic fire extinguishing device, improving the qualified rate of the product, and having strong practicality and great promotion significance.

[0031] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0032] The above-described embodiments merely represent several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present utility model patent shall be determined by the appended claims.

Claims

1. A battery box with an automatic fire extinguishing device, characterized in that: It includes a box body, a lithium battery module arranged in the box body, an upper cover installed on the box body, and an automatic fire extinguishing device installed on the upper cover and arranged between the upper cover and the box body. The automatic fire extinguishing device includes a shell body, a fire extinguishing bag, a heat-sensitive wire and a sealing layer. The shell body is provided with two first side panels arranged opposite to each other, two second side panels arranged opposite to each other and two cover plates arranged opposite to each other. The first side panels, the second side panels and the two cover plates enclose an inner space. The two second side panels are provided with guide holes. The sealing layer is fixed to the inner side surface of the second side panel and seals the guide hole. A weakening line is provided on the sealing layer. The area enclosed by the weakening line is smaller than the orifice size of the guide hole. The weakening line of the sealing layer is arranged opposite to the guide hole.

2. The battery box with automatic fire extinguishing device according to claim 1, characterized in that: The shell body is further provided with two fixing plates, which are arranged opposite to each other and parallel to each other. The main axis extension direction of the fixing plates is opposite to the two second side plates, and the fire extinguishing bag is fixedly installed between the two fixing plates.

3. The battery box with automatic fire extinguishing device according to claim 2, characterized in that: One side of the fixing plate is connected to one of the cover plates, and the other side of the fixing plate is fitted with the other cover plate.

4. The battery box with automatic fire extinguishing device according to claim 3, characterized in that: An auxiliary head is provided on one of the first side plates of the shell body. The auxiliary head is provided with a through hole that penetrates from the outside to the inside. The through hole penetrates the first side plate and is connected to the inner space. The thermal line extends from the through hole.

5. The battery box with automatic fire extinguishing device according to claim 4, characterized in that: The thermal sensitive wire includes a first trigger segment, a second trigger segment connected to the first trigger segment, and two third trigger segments connected to both ends of the second trigger segment. One end of the first trigger segment passes through the through hole and extends to the outside of the shell body. The outer wall of the first trigger segment is in contact with the hole wall of the through hole, and the other end of the first trigger segment extends into the inner space.

6. The battery box with automatic fire extinguishing device according to claim 5, characterized in that: The second trigger section is arranged between the fixing plate on the side close to the through hole and the first side plate.

7. The battery box with automatic fire extinguishing device according to claim 5, characterized in that: The two third trigger sections of the thermal line are respectively connected to the two sides of the fire extinguishing bag.

8. The battery box with automatic fire extinguishing device according to claim 1, characterized in that: The path of the weakening line is one of a circle, a square, a triangle and a hexagon.

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