Battery fire extinguishing system and battery equipment

Abstract

The battery fire fighting system comprises a first fire fighting device and a second fire fighting device, the first fire fighting device comprises a first bag used for storing fire fighting liquid, and the first bag is provided with a liquid outlet structure; the liquid outlet structure is used for being opened to discharge the fire-fighting liquid in the first bag when the variable quantity of the external temperature exceeds a first threshold value and / or the variable quantity of the external air pressure exceeds a second threshold value, the second fire-fighting device comprises a second bag used for storing fire-fighting gas, and the second bag is provided with a gas outlet structure; the gas outlet structure is used for being opened to discharge the fire fighting gas in the second bag when the variation of the external temperature exceeds a third threshold value and / or the variation of the external air pressure exceeds a fourth threshold value, and the discharged fire fighting gas acts on the discharged fire fighting liquid to achieve atomization of the fire fighting liquid. The battery fire-fighting system is simple in structure, low in cost, reliable in operation, rapid in overall fire-fighting response and good in fire-fighting effect.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery fire fighting system and a battery device. Background Art

[0002] At present, batteries generally adopt PACK-level fire protection, that is, a detector for monitoring temperature or combustible gas is set inside or outside the plug box, and the signal detected by the detector can be transmitted to the fire host, which will start the solenoid valve and air compressor, so that the fire protection medium can be sprayed into the plug box through the conduit for fire protection. However, the battery fire protection system in the prior art has problems such as complex structure, high cost, difficult maintenance, many links, easy failure, and poor fire protection effect. Summary of the invention

[0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0004] To this end, an embodiment of the present invention proposes a battery fire fighting system, which has a simple structure, low cost, reliable operation, rapid overall fire fighting response, and good fire fighting effect.

[0005] An embodiment of the present invention further provides a battery device including the battery fire protection system.

[0006] The battery fire protection system of the embodiment of the present invention includes:

[0007] A first fire-fighting device, the first fire-fighting device comprising a first bag for storing fire-fighting liquid, the first bag being provided with a liquid outlet structure, the liquid outlet structure being used to open to discharge the fire-fighting liquid in the first bag when the change in the external temperature exceeds a first threshold value and / or the change in the external air pressure exceeds a second threshold value;

[0008] a second fire-fighting device, the second fire-fighting device comprising a second bag for storing fire-fighting gas, the second bag being provided with a gas outlet structure, the gas outlet structure being configured to be opened to discharge the fire-fighting gas in the second bag when the change in the outside temperature exceeds a third threshold value and / or the change in the outside air pressure exceeds a fourth threshold value;

[0009] And the discharged fire-fighting gas acts on the discharged fire-fighting liquid to achieve atomization of the fire-fighting liquid.

[0010] In some embodiments, the first package has a liquid outlet side facing the battery cell, the liquid outlet structure includes a plurality of injection holes arranged on the liquid outlet side, a first sealing member for sealing and blocking the injection holes is provided in the injection holes, and the first sealing member shrinks when heated to open the injection holes.

[0011] In some embodiments, the liquid outlet structure includes a plurality of weak structural parts arranged on the liquid outlet side, and the first fire-fighting device includes a plate member arranged on the outside of the liquid outlet side, and the plate member is provided with a plurality of action parts, and the plurality of action parts are respectively arranged opposite to the plurality of weak structural parts, and the action parts are used to move toward the weak structural parts and break the weak structural parts under the action of external air pressure.

[0012] In some embodiments, the action portion includes a puncturing portion and a plate portion, the puncturing portion is arranged on the side of the plate portion facing the first package, and the puncturing portion is arranged opposite to the weak structure portion and is used to puncture the weak structure portion, and the side of the plate portion facing away from the puncturing portion is provided with a first concave surface for bearing external air pressure to drive the puncturing portion to move.

[0013] In some embodiments, the plate is provided with a plurality of ejection holes, the plurality of ejection holes and the plurality of action parts are arranged alternately, and the plurality of ejection holes are arranged opposite to the plurality of ejection holes one by one;

[0014] And / or, the first sealing member is a heat shrink sealant;

[0015] And / or, the weak structural portion is an indentation.

[0016] In some embodiments, the air outlet structure includes a plurality of air jet holes disposed on the outer peripheral side of the second package, the plurality of air jet holes are arranged at intervals along the circumference of the second package, a second sealing member for sealing and blocking the air jet holes is disposed in the air jet holes, and the second sealing member shrinks when heated to open the air jet holes.

[0017] In some embodiments, along a direction toward the battery cell, the plurality of gas injection holes are spaced apart from the liquid outlet structure and are adjacent to the battery cell relative to the liquid outlet structure.

[0018] In some embodiments, the end of the second bag facing the battery cell is provided with a second concave surface for bearing external air pressure to compress the second bag;

[0019] And / or, the second sealing member is a heat shrink sealant.

[0020] In some embodiments, the first fire-fighting devices are provided in plurality, the plurality of the first fire-fighting devices are all arranged extending along a first direction, and the plurality of the first fire-fighting devices are arranged at intervals along a second direction orthogonal to the first direction;

[0021] There are a plurality of the second fire-fighting devices, and the plurality of the second fire-fighting devices are divided into a plurality of groups, each group includes a plurality of the second fire-fighting devices arranged at intervals along the first direction, and each group is arranged between two adjacent first fire-fighting devices;

[0022] and / or, both the first package and the second package are heat-shrunk;

[0023] And / or, the first threshold is consistent with the third threshold, and the second threshold is consistent with the fourth threshold.

[0024] The battery equipment of an embodiment of the present invention includes a battery fire protection system, multiple battery cells and a box body as described in any of the above embodiments, the battery fire protection system and the multiple battery cells are both arranged in the box body, and the first fire protection device and the second fire protection device are both connected and fixed to the inner wall of the box body.

[0025] Beneficial effects: The battery fire fighting system and battery equipment of the embodiments of the present invention have a simple structure, low cost, reliable operation, rapid overall fire fighting response, and good fire fighting effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a side schematic diagram of the overall structure of the battery fire protection system of an embodiment of the present invention.

[0027] Figure 2 yes Figure 1 Schematic diagram of the liquid outlet side of the first package.

[0028] Figure 3 yes Figure 1 Schematic diagram of the middle plate.

[0029] Figure 4 yes Figure 1 A local enlarged schematic diagram of point A in the middle.

[0030] Figure 5 It is a side view of the second package.

[0031] Figure 6 This is a top view of the second package.

[0032] Figure 7 It is a schematic diagram of the arrangement of multiple first fire-fighting devices and multiple second fire-fighting devices according to an embodiment of the present invention.

[0033] Figure 8 It is a side cross-sectional schematic diagram of a battery device according to an embodiment of the present invention.

[0034] Reference numerals:

[0035] 100-battery fire fighting system;

[0036] 1-first fire fighting device; 11-first bag; 111-liquid outlet structure; 1111-injection hole; 1112-weak structure part; 112-first blocking member; 12-plate member; 121-action part; 1211-puncture part; 1212-plate part; 1213-first concave surface; 122-injection hole;

[0037] 2-second fire fighting device; 21-second bag; 211-air outlet structure; 2111-jet hole; 2112-second blocking member; 212-second concave surface;

[0038] 200-cabinet;

[0039] 300-battery cells. DETAILED DESCRIPTION

[0040] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0041] The present invention is based on the inventor's discovery and understanding of the following facts and problems:

[0042] In the related technology, the battery fire protection system usually includes a fire protection host, a fire protection medium storage tank, a smoke sensor, a temperature sensor, a pipeline, etc. Its overall structure is complex, the cost is high, and maintenance is difficult. When any component such as the fire protection host, the fire protection medium storage tank, the smoke sensor, the temperature sensor, the pipeline, etc. fails, the fire protection system of the entire container system will fail, and normal fire protection will not be possible, posing a high fire hazard.

[0043] like Figure 1 As shown, the battery fire fighting system 100 according to the embodiment of the present invention comprises a first fire fighting device 1 and a second fire fighting device 2 .

[0044] The first fire-fighting device 1 includes a first bag 11 for storing fire-fighting liquid. The first bag 11 is provided with a liquid outlet structure 111. The liquid outlet structure 111 is used to open to discharge the fire-fighting liquid in the first bag 11 when the change in external temperature exceeds a first threshold value and / or the change in external air pressure exceeds a second threshold value.

[0045] For example, the fire-fighting liquid may be a liquid with fire-fighting function such as perfluoroacetone, and the fire-fighting liquid may be pre-filled in the first bag 11. The liquid outlet structure 111 may be a hole-shaped structure, etc., and the liquid outlet structure 111 has a self-opening function.

[0046] The first fire-fighting device 1 can be installed in a battery. When thermal runaway occurs in a local battery cell 300 of the battery, the temperature inside the battery will rise. When the temperature rises to the allowed temperature threshold (first threshold), the liquid outlet structure 111 will open automatically, so that the fire-fighting liquid can be discharged through the liquid outlet structure 111, thereby achieving the effect of fire-fighting and suppressing the spread of thermal runaway.

[0047] It should be noted that when a local battery cell 300 experiences thermal runaway, the battery cell 300 will generate a large amount of high-temperature flammable gas, thereby increasing the air pressure in the battery. When the air pressure increases to the allowed air pressure threshold (second threshold), the liquid outlet structure 111 may open automatically, so that the fire-fighting liquid may be discharged through the liquid outlet structure 111, thereby achieving fire-fighting and suppressing the spread of thermal runaway.

[0048] The second fire-fighting device 2 includes a second bag 21 for storing fire-fighting gas. The second bag 21 is provided with an air outlet structure 211. The air outlet structure 211 is used to open to discharge the fire-fighting gas in the second bag 21 when the change in the external temperature exceeds a third threshold and / or the change in the external air pressure exceeds a fourth threshold.

[0049] For example, the firefighting gas may be a gas with firefighting function such as nitrogen, and the firefighting gas may be pre-filled in the second bag 21. The gas outlet structure 211 may also be a hole-shaped structure, etc., and the gas outlet structure 211 also has a self-opening function.

[0050] The second fire-fighting device 2 can also be installed in the battery. When thermal runaway occurs in the local battery cell 300 of the battery, the temperature inside the battery will rise. When the temperature rises to the allowed temperature threshold (the third threshold), the air outlet structure 211 will open automatically, so that the fire-fighting gas can be discharged through the air outlet structure 211, thereby achieving the effect of fire-fighting and suppressing the spread of thermal runaway.

[0051] It should be noted that when a local battery cell 300 experiences thermal runaway, the battery cell 300 will generate a large amount of high-temperature flammable gas, thereby increasing the air pressure in the battery. When the air pressure increases to the allowed air pressure threshold (the fourth threshold), the air outlet structure 211 may open automatically at this time, so that the fire-fighting gas may be discharged through the air outlet structure 211, thereby achieving fire-fighting and suppressing the spread of thermal runaway.

[0052] It should be noted that the above-mentioned fire-fighting gas and fire-fighting liquid can be discharged at the same time. At this time, the discharged fire-fighting gas will act on the discharged fire-fighting liquid, thereby realizing the atomization of the fire-fighting liquid. In this way, the mixed medium formed by the fire-fighting gas and the fire-fighting liquid can be fully mixed and can be quickly filled into the entire battery, thereby shortening the fire-fighting response time and improving the overall fire-fighting effect.

[0053] The battery fire fighting system 100 of the embodiment of the present invention is only provided with a first fire fighting device 1 and a second fire fighting device 2, and both the first fire fighting device 1 and the second fire fighting device 2 can realize self-draining or exhausting through changes in temperature and air pressure, thereby avoiding the need to set up sensors, host computers, etc. in the prior art, simplifying the overall structural layout, and reducing the overall cost.

[0054] Secondly, since the overall structure is simplified, compared with complex structural forms, the overall operation of this simpler structure is more reliable, thus avoiding the problem of fire failure caused by damage to any component when there are many structural components, and ensuring the reliability and stability of use.

[0055] In addition, the sprayed fire-fighting gas can realize the atomization of the fire-fighting liquid, so that the fire-fighting liquid can be replaced evenly and quickly to fill various positions of the battery, shortening the overall fire-fighting response time and improving the overall fire-fighting effect.

[0056] In some embodiments, the first package 11 has a liquid outlet side facing the battery cell 300, and the liquid outlet structure 111 includes a plurality of injection holes 1111 arranged on the liquid outlet side. A first sealing member 112 for sealing and blocking the injection holes 1111 is provided in the injection holes 1111, and the first sealing member 112 shrinks when heated to open the injection holes 1111.

[0057] For example, the liquid outlet side may be the bottom side of the first package 11, that is, the battery cell 300 may be installed on the bottom side of the first package 11. Figure 2 As shown, the plurality of injection holes 1111 may be circular holes, and the plurality of injection holes 1111 may be evenly arranged in a matrix on the bottom side of the first package 11. A first blocking member 112 may be installed in each injection hole 1111, and the material of the first blocking member 112 may be heat shrink sealant.

[0058] Under normal conditions, the first blocking member 112 can seal the corresponding injection hole 1111, thereby preventing the fire-fighting liquid from being discharged. When the temperature inside the battery gradually increases, the first blocking member 112 will shrink and eventually release the blockage of the injection hole 1111, and the fire-fighting liquid can flow out of the injection hole 1111.

[0059] In some embodiments, the liquid outlet structure 111 includes a plurality of weak structural portions 1112 arranged on the liquid outlet side, and the first fire-fighting device 1 includes a plate 12 arranged on the outside of the liquid outlet side, and the plate 12 is provided with a plurality of action portions 121, and the plurality of action portions 121 and the plurality of weak structural portions 1112 are respectively arranged opposite to each other, and the action portions 121 are used to move toward the weak structural portion 1112 under the action of external air pressure and break the weak structural portion 1112.

[0060] For example, Figure 2 As shown, the weak structure portion 1112 may be an area on the package wall of the first package 11 with relatively weak structural strength. The weak structure portion 1112 may be formed by thinning the local wall thickness of the package wall, so that the first package 11 may be easily broken from the weak structure portion 1112 .

[0061] like Figure 3As shown, the plate body can be roughly in the shape of a long plate, and the plate body can be arranged on the bottom side of the first package 11. A plurality of action parts 121 can be fixed on the plate body, and the action parts 121 can be a conical structure, etc., and the plurality of action parts 121 can be arranged one by one directly below the above-mentioned plurality of weak structural parts 1112.

[0062] When the gas pressure in the battery continues to increase, the plate will deform under the action of the gas pressure, which can be understood as a sudden increase in gas pressure. At this time, the plate will drive the above-mentioned action part 121 to move upward, and the upward action part 121 can directly act on the corresponding weak structure part 1112 and break the weak structure part 1112, thereby meeting the fire-fighting needs of discharging the fire-fighting liquid when the gas pressure inside the battery is different.

[0063] In some embodiments, the action portion 121 includes a puncturing portion 1211 and a plate portion 1212, the puncturing portion 1211 is arranged on the side of the plate portion 1212 facing the first package 11, and the puncturing portion 1211 is arranged opposite to the weak structure portion 1112 and is used to puncture the weak structure portion 1112, and the side of the plate portion 1212 facing away from the puncturing portion 1211 is provided with a first concave surface 1213 for bearing external air pressure to drive the puncturing portion 1211 to move.

[0064] For example, Figure 4 As shown, the piercing portion 1211 can be generally a conical structure, the plate portion 1212 can be generally a flat plate, the plate portion 1212 can be fixed to the bottom side of the piercing portion 1211, and the left and right sides of the plate portion 1212 can be folded downward. The first concave surface 1213 can be generally an arc surface, and the first concave surface 1213 is located at the bottom side of the plate portion 1212.

[0065] When in use, the first concave surface 1213 can be directly arranged opposite to the battery cell 300, and the gas discharged from the battery cell 300 can directly act on the first concave surface 1213, thereby ensuring the effect of driving the puncture portion 1211 to move upward.

[0066] In some embodiments, the plate 12 is provided with a plurality of ejection holes 122, the plurality of ejection holes 122 and the plurality of action parts 121 are arranged alternately, and the plurality of injection holes 1111 are arranged opposite to the plurality of ejection holes 122 one by one. Figure 3 As shown, the ejection hole 122 may be a rectangular hole, and the plurality of ejection holes 122 and the plurality of action parts 121 may be arranged alternately one by one in the left-right direction, and the ejection holes 122 may be located directly below the corresponding injection holes 1111. This facilitates the discharge of the fire-fighting liquid through the injection holes 1111 and the ejection holes 122, and avoids the plate body from blocking the discharged fire-fighting liquid.

[0067] In some embodiments, the weak structure 1112 is an indentation. Figure 2As shown, the indentation may specifically be a cross indentation, and the indentation may be engraved by laser, thereby facilitating the processing and formation of the weak structure portion 1112 .

[0068] In some embodiments, the air outlet structure 211 includes a plurality of jet holes 2111 disposed on the outer peripheral side of the second package 21, the plurality of jet holes 2111 are arranged at intervals along the circumference of the second package 21, a second sealing member 2112 for sealing and blocking the jet holes 2111 is disposed in the jet holes 2111, and the second sealing member 2112 shrinks when heated to open the jet holes 2111.

[0069] For example, Figure 5 and Figure 6 As shown, the second package 21 can be generally a cylindrical structure, and the circumferential side wall of the second package 21 can be provided with a plurality of jet holes 2111, and the plurality of jet holes 2111 can be arranged at equal intervals along the circumference of the second package 21. Each jet hole 2111 can be a circular hole, and each jet hole 2111 is equipped with a second blocking member 2112, and the material of the second blocking member 2112 can also be a heat shrink sealant.

[0070] Under normal conditions, the second blocking member 2112 can seal the corresponding jet hole 2111, thereby preventing the firefighting gas from being discharged. When the temperature inside the battery gradually increases, the second blocking member 2112 will shrink and eventually release the blockage of the jet hole 2111, and the firefighting gas can then flow out of the jet hole 2111.

[0071] In some embodiments, in the direction toward the battery cell 300, a plurality of jet holes 2111 are arranged at intervals from the liquid outlet structure 111 and are adjacent to the battery cell 300 relative to the liquid outlet structure 111. Specifically, the direction toward the battery cell 300 may be an up-and-down direction, and each jet hole 2111 may be located below the jet hole 1111 and arranged at a certain distance from the jet hole 1111. Thus, the firefighting gas ejected from the jet hole 2111 can completely act on the ejected firefighting liquid, thereby facilitating the overall atomization effect.

[0072] In some embodiments, the end of the second package 21 facing the battery cell 300 is provided with a second concave surface 212 for bearing the external air pressure to compress the second package 21. Figure 5 As shown, the second concave surface 212 may be the bottom surface of the second package 21 , the second concave surface 212 may be substantially a partial spherical surface, and the second concave surface 212 may be arranged opposite to the corresponding battery cell 300 .

[0073] When the battery cell 300 is in thermal runaway, the gas released by the battery cell 300 can directly act on the second concave surface 212. At this time, the second concave surface 212 will be pressurized and squeeze the second package 21, and the air pressure in the second package 21 will also increase. When the pressure effect of the air pressure is greater than the blocking effect of the second blocking member 2112 on the air jet hole 2111, the second blocking member 2112 will be rushed out, and the firefighting gas will be discharged through the air jet hole 2111. This meets the firefighting needs of discharging firefighting gas when the air pressure inside the battery is different.

[0074] In some embodiments, there are multiple first fire-fighting devices 1, and the multiple first fire-fighting devices 1 are all extended and arranged along the first direction, and the multiple first fire-fighting devices 1 are arranged at intervals along a second direction orthogonal to the first direction. There are multiple second fire-fighting devices 2, and the multiple second fire-fighting devices 2 are divided into multiple groups, each group includes multiple second fire-fighting devices 2 arranged at intervals along the first direction, and each group is arranged between two adjacent first fire-fighting devices 1.

[0075] For example, Figure 7 As shown, the first direction can be the left-right direction, the second direction can be the front-back direction, four first fire-fighting devices 1 can be provided, each first fire-fighting device 1 can be a strip structure and can be extended along the left-right direction, and the four first fire-fighting devices 1 can be arranged at equal intervals along the front-back direction.

[0076] The second fire fighting device 2 may be provided with three groups, each group including a plurality of second fire fighting devices 2 arranged at equal intervals in the left-right direction, and the three groups of second fire fighting devices 2 and the above four first fire fighting devices 1 may be arranged alternately one by one along the front-back direction. Thus, on the one hand, the uniform arrangement of the first fire fighting device 1 and the second fire fighting device 2 is achieved, and on the other hand, the first fire fighting device 1 can be distributed around the second fire fighting device 2, thereby fully ensuring the adequacy of the atomization of the ejected fire fighting gas.

[0077] In some embodiments, the first package 11 and the second package 21 are both heat-shrunk. For example, the first package 11 and the second package 21 can be formed by heat-shrunk materials, such as polyethylene. Therefore, when some of the battery cells 300 are thermally runaway, the first package 11 and the second package 21 can be heat-shrunk, thereby increasing the pressure inside the first package 11 and the second package 21, which is more conducive to releasing the sealing of the first blocking member 112 and the second blocking member 2112, and ensuring the timely discharge of the fire-fighting liquid and the fire-fighting gas.

[0078] In some embodiments, the first threshold value is consistent with the third threshold value, and the second threshold value is consistent with the fourth threshold value. Thus, the first fire-fighting device 1 and the second fire-fighting device 2 can discharge the fire-fighting liquid and the fire-fighting gas almost simultaneously, thereby ensuring the synchronization of the fire-fighting effects of the first fire-fighting device 1 and the second fire-fighting device 2, and further ensuring the atomization effect.

[0079] Next, a battery device according to an embodiment of the present invention will be described.

[0080] The battery equipment of an embodiment of the present invention includes a battery fire fighting system 100, multiple battery cells 300 and a box body 200. The battery fire fighting system 100 can be the battery fire fighting system 100 described in any of the above embodiments. The battery fire fighting system 100 and the multiple battery cells 300 are both arranged in the box body 200, and the first fire fighting device 1 and the second fire fighting device 2 are both connected and fixed to the inner wall of the box body 200.

[0081] For example, Figure 8 As shown, the box body 200 may be a plug-in box, and the box body 200 may include a box cover and a box bottom, wherein the box cover may be installed above the box bottom and sealedly connected to the box bottom. The first bag 11 and the plate 12 of the first fire fighting device 1 may be fixed to the top inner wall of the box cover by adhesive bonding, and the second bag 21 of the second fire fighting device 2 may also be fixed to the top inner wall of the box cover by adhesive bonding.

[0082] A specific example of the battery device according to the embodiment of the present invention is described below.

[0083] The fire protection system of the battery device of the embodiment of the present invention mainly consists of two parts: a fire protection medium bag device (which can be regarded as a first fire protection device 1) and a nitrogen bag device (which can be regarded as a second fire protection device 2).

[0084] The firefighting medium bag device is composed of a firefighting medium bag (which can be regarded as the first bag 11) and a bottom plate (which can be regarded as a plate 12). The firefighting medium bag is composed of a firefighting medium (which can be regarded as a firefighting liquid), a fixing glue, a heat shrink bag, a heat shrink sealant, a spray hole 1111, and a cross indentation. The bottom plate is composed of a puncture angle (which can be regarded as an action part 121), a fixing glue, a pressurized concave surface (a first concave surface 1213), and a spray slot.

[0085] The nitrogen bag device is composed of fixing glue, nitrogen, heat shrink bag, heat shrink sealant, jet hole, and pressure-extruded concave surface (second concave surface 212). The nitrogen bag device, firefighting medium bag and bottom plate are glued to the box cover by fixing glue, which reduces mechanical connection, reduces the height of the plug-in box, and saves materials.

[0086] When thermal runaway occurs in the battery cell 300 , a large amount of high-temperature flammable gas will be generated in the battery box 200 .

[0087] 1. Temperature sensing fire protection:

[0088] The heat shrink bag of the fire-fighting medium bag device is made of a material that shrinks when heated. When the heat shrink bag is in a high-temperature environment, the heat shrink bag shrinks inward, the space is reduced, the fire-fighting medium in the heat shrink bag is squeezed, and the pressure increases. When the pressure is greater than the adhesion between the heat shrink sealant and the heat shrink bag, the fire-fighting medium can be sprayed out from the spray hole and pass through the spray slot of the bottom plate to extinguish the fire and cool the battery module. As the thermal runaway temperature increases and time continues, the fire-fighting medium in the heat shrink bag can be completely sprayed out, thereby ensuring the amount of fire-fighting medium used.

[0089] The spray holes are arranged in the required quantity at the bottom of the heat shrink package, and the spray holes as a whole can cover the upper space of the entire module, so that the module can be effectively sprayed in the entire area, ensuring that the entire module is within the spray range of the fire-fighting medium.

[0090] 2. Pressure-sensitive fire protection:

[0091] A cross indentation is engraved by laser between the two injection holes at the bottom of the heat shrink package of the fire-fighting medium package device. Thermal runaway produces a large amount of high-temperature flammable gas, which increases the pressure inside the sealed plug-in box. The high-pressure gas will push each pressurized extrusion concave surface to move upward, and the puncture angle on the pressurized extrusion concave surface will also move upward. The puncture angle facing the center of the cross indentation will pierce the cross indentation. As all the puncture angles move upward, all the cross indentations are punctured, and the fire-fighting medium is squeezed and ejected from the ruptured cross indentations under the pressure from below.

[0092] The cross indentations are arranged at the bottom of the heat shrink package according to the required number. The cross indentations cover the upper space of the entire module, which can effectively spray the entire area of ​​the module to ensure that the entire module is within the spraying range of the fire-fighting medium.

[0093] 3. Gas-liquid two-phase fire protection:

[0094] The nitrogen bag device is filled with nitrogen at a certain pressure.

[0095] The heat shrink bag is made of a material that shrinks when heated. When the heat shrink bag is in a high temperature environment, the heat shrink bag shrinks inward, the space shrinks, the nitrogen in the heat shrink bag is squeezed, and the pressure increases. When the pressure is greater than the adhesion between the heat shrink sealant and the heat shrink bag, the nitrogen can be sprayed out from the spray hole. As the thermal runaway temperature increases and time continues, all the nitrogen in the heat shrink bag can be sprayed out.

[0096] The high-pressure gas pushes each pressurized extrusion concave surface of the nitrogen bag device to move upward, and the nitrogen is squeezed and ejected from the injection hole under the pressure from below.

[0097] The injection hole of the nitrogen bag device can spray nitrogen in the horizontal direction, and the injection hole of the fire-fighting medium bag device can spray liquid fire-fighting medium vertically downward. The nitrogen sprayed horizontally by the nitrogen bag device blows away the liquid fire-fighting medium sprayed vertically downward by the fire-fighting medium bag device, so that the gaseous nitrogen and the liquid fire-fighting medium can be merged to form atomization. The nitrogen and liquid fire-fighting medium are mixed to extinguish the fire, and can quickly fill the plug-in box space to realize plug-in box fire fighting.

[0098] The entire fire-fighting device can self-start and spray fire-fighting by relying on temperature and pressure sensing. It does not require fire-fighting host, fire-fighting medium storage tank, smoke sensor, temperature sensor, pipeline and other components. It is simple, reliable, economical and practical.

[0099] In the description of the present invention, it is to 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”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0100] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0101] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0102] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0103] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0104] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. A battery fire fighting system, characterized in that: include: A first fire-fighting device, the first fire-fighting device comprising a first bag for storing fire-fighting liquid, the first bag being provided with a liquid outlet structure, the liquid outlet structure being used to open to discharge the fire-fighting liquid in the first bag when the change in the external temperature exceeds a first threshold value and / or the change in the external air pressure exceeds a second threshold value; a second fire-fighting device, the second fire-fighting device comprising a second bag for storing fire-fighting gas, the second bag being provided with a gas outlet structure, the gas outlet structure being configured to be opened to discharge the fire-fighting gas in the second bag when the change in the outside temperature exceeds a third threshold value and / or the change in the outside air pressure exceeds a fourth threshold value; And the discharged fire-fighting gas acts on the discharged fire-fighting liquid to achieve atomization of the fire-fighting liquid.

2. The battery fire fighting system according to claim 1, characterized in that: The first package has a liquid outlet side facing the battery cell, the liquid outlet structure includes a plurality of injection holes arranged on the liquid outlet side, a first blocking member for sealing the injection holes is arranged in the injection holes, and the first blocking member shrinks when heated to open the injection holes.

3. The battery fire fighting system according to claim 2, characterized in that: The liquid outlet structure includes a plurality of weak structural parts arranged on the liquid outlet side, the first fire-fighting device includes a plate member arranged on the outside of the liquid outlet side, the plate member is provided with a plurality of action parts, the plurality of action parts are respectively arranged opposite to the plurality of weak structural parts, and the action parts are used to move toward the weak structural parts under the action of external air pressure and break the weak structural parts.

4. The battery fire fighting system according to claim 3, characterized in that: The action portion includes a puncturing portion and a plate portion, wherein the puncturing portion is arranged on a side of the plate portion facing the first package, and the puncturing portion is arranged opposite to the weak structure portion and is used to puncture the weak structure portion, and a first concave surface is provided on a side of the plate portion away from the puncturing portion to withstand external air pressure to drive the puncturing portion to move.

5. The battery fire fighting system according to claim 3, characterized in that: The plate is provided with a plurality of ejection holes, the plurality of ejection holes and the plurality of action parts are arranged alternately, and the plurality of ejection holes are arranged opposite to the plurality of ejection holes one by one; And / or, the first sealing member is a heat shrink sealant; And / or, the weak structural portion is an indentation.

6. The battery fire fighting system according to claim 1, characterized in that: The air outlet structure includes a plurality of air injection holes arranged on the outer peripheral side of the second bag, the plurality of air injection holes are arranged at intervals along the circumference of the second bag, a second blocking member for sealing and blocking the air injection holes is arranged in the air injection holes, and the second blocking member shrinks when heated to open the air injection holes.

7. The battery fire fighting system according to claim 6, characterized in that: In a direction toward the battery cell, the plurality of gas injection holes are spaced apart from the liquid outlet structure and are adjacent to the battery cell relative to the liquid outlet structure.

8. The battery fire fighting system according to claim 6, characterized in that: The end of the second bag facing the battery core is provided with a second concave surface for bearing external air pressure to compress the second bag; And / or, the second sealing member is a heat shrink sealant.

9. The battery fire fighting system according to any one of claims 1 to 8, characterized in that: There are a plurality of the first fire-fighting devices, and the plurality of the first fire-fighting devices are all arranged extending along a first direction, and the plurality of the first fire-fighting devices are arranged at intervals along a second direction orthogonal to the first direction; There are a plurality of the second fire-fighting devices, and the plurality of the second fire-fighting devices are divided into a plurality of groups, each group includes a plurality of the second fire-fighting devices arranged at intervals along the first direction, and each group is arranged between two adjacent first fire-fighting devices; and / or, both the first package and the second package are heat-shrunk; And / or, the first threshold is consistent with the third threshold, and the second threshold is consistent with the fourth threshold.

10. A battery device, characterized in that: It comprises a battery fire fighting system, a plurality of battery cells and a box as described in any one of claims 1 to 9 above, wherein the battery fire fighting system and the plurality of battery cells are both arranged in the box, and the first fire fighting device and the second fire fighting device are both connected and fixed to the inner wall of the box.

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