A lithium battery safety alarm and disposal system, method and device

Abstract

The present application discloses a lithium battery safety alarm and disposal system, method and device. The method includes the following steps: detecting the temperature of the battery pack; when the temperature of the battery pack is in the first temperature range, using a CO<subgt;2< / subgt> fire extinguishing device to extinguish the fire of the battery pack; when the temperature of the battery pack is in the second temperature range, using a liquid nitrogen fire extinguishing device to cool down and extinguish the fire of the battery pack; when the temperature of the battery pack is in the third temperature range, using a CO<subgt;2< / subgt> fire extinguishing device, a liquid nitrogen fire extinguishing device and an aqueous agent spraying device to cool down and extinguish the fire of the battery pack simultaneously; when the temperature of the battery pack is in the fourth temperature range, starting the lifting system to lower the battery pack tray until the battery pack is immersed in the fire extinguishing liquid in the water tank. For battery packs in different temperature ranges, different methods of cooling down and extinguishing the fire are used for treatment, so as to achieve precise monitoring and treatment of the safety risks of lithium batteries.

Description

Technical Field

[0001] This application relates to the technical field of lithium-ion batteries. Specifically, it relates to a lithium battery safety alarm and disposal system, method, and device. Background Art

[0002] Lithium-ion batteries have advantages such as high energy density and long cycle life. However, lithium-ion batteries are prone to failure under conditions such as short circuit, overcharge, and overheat, leading to fire and explosion.

[0003] Different from conventional fires, the development speed of lithium-ion batteries is very fast when out of control, and timely disposal is required. At present, the safety alarm and disposal methods for lithium-ion batteries are relatively simple, only judging whether there is a fire risk through temperature detection or smoke detection, etc., and unable to judge the risk level, which also brings inconvenience to the subsequent risk assessment and handling. Summary of the Invention

[0004] The main purpose of this application is to provide a lithium battery safety alarm and disposal system, method, and device to solve the problem that the safety alarm and disposal methods for lithium-ion batteries in the prior art are relatively simple.

[0005] One embodiment of this application provides a lithium battery safety alarm and disposal method for a lithium battery safety alarm and disposal device. The lithium battery safety alarm and disposal device includes:

[0006] A workbench for carrying a battery pack. The workbench includes a water tank, a battery pack support plate disposed on the water tank, and a lifting system for driving the battery pack support plate to move up and down in the water tank. A fire extinguishing liquid is provided in the water tank. The battery pack support plate is located above the fire extinguishing liquid when the battery pack is in a normal state, and the battery pack support plate is immersed in the fire extinguishing liquid when the battery pack is in an abnormal state;

[0007] A safety cover is disposed above the workbench and encloses the tabletop of the workbench. The safety cover includes a slide rail disposed on the workbench, a plurality of support frames sliding on the slide rail, and an outer frame fireproof cloth covering the plurality of support frames. The plurality of support frames are connected by a telescopic hinge mechanism for changing the distance between the plurality of support frames. A detection device and a danger handling device are disposed on the plurality of support frames. The detection device is used to detect the state of the battery pack, and the danger handling device is used to handle the danger of the battery pack. The detection device includes one or more of the following: a temperature sensor, a smoke sensor, an infrared thermal imaging camera. The danger handling device includes one or more of the following: a CO2 fire extinguishing device, a liquid nitrogen fire extinguishing device, a water agent spraying device, a poisonous gas neutralization spraying device; and

[0008] A control device, which is used to select one or more of the danger handling devices to handle the battery pack according to the detection results of the detection device. The control device is used to execute the steps in the lithium battery safety alarm and disposal method.

[0009] The lithium battery safety alarm and disposal method includes the following steps:

[0010] Detect the temperature of the battery pack;

[0011] When the temperature of the battery pack is within the first temperature range, use the CO2 fire extinguishing device to extinguish the fire on the battery pack;

[0012] When the temperature of the battery pack is within the second temperature range, use the liquid nitrogen fire extinguishing device to cool down and extinguish the fire on the battery pack;

[0013] When the temperature of the battery pack is within the third temperature range, simultaneously use the CO2 fire extinguishing device, the liquid nitrogen fire extinguishing device, and the water agent spraying device to cool down and extinguish the fire on the battery pack;

[0014] When the temperature of the battery pack is within the fourth temperature range, start the lifting system to lower the battery pack tray until the battery pack is immersed in the fire extinguishing liquid in the water tank.

[0015] In one embodiment, the first temperature range is a temperature greater than 45°C and less than or equal to 55°C, the second temperature range is a temperature greater than 55°C and less than or equal to 60°C, the third temperature range is a temperature greater than 60°C and less than or equal to 100°C, and the fourth temperature range is a temperature greater than 100°C.

[0016] In one embodiment, the lithium battery safety alarm and disposal method further includes the following steps:

[0017] Detect the temperature rising rate of the battery pack;

[0018] When the temperature rising rate of the battery pack is greater than the first preset value, use the CO2 fire extinguishing device to extinguish the fire on the battery pack;

[0019] Continue to detect the temperature rising rate of the battery pack;

[0020] When the temperature rising rate of the battery pack after being extinguished by the CO2 fire extinguishing device is greater than the second preset value, start the lifting system to lower the battery pack tray until the battery pack is immersed in the fire extinguishing liquid in the water tank.

[0021] In one embodiment, the first preset value is 5°C / s, and the second preset value is 2°C / s.

[0022] In one embodiment, the lithium battery safety alarm and disposal method further includes the following steps:

[0023] Detect whether the battery pack has abnormal smoking;

[0024] If so, simultaneously use the CO2 fire extinguishing device, the liquid nitrogen fire extinguishing device, and the water agent spraying device to cool down and extinguish the battery pack, and use the poisonous gas neutralization spraying device to neutralize the poisonous gas of the battery pack.

[0025] In one embodiment, the lithium battery safety alarm and disposal method further includes the following steps:

[0026] Detect whether the battery pack has abnormal ignition;

[0027] If so, start the lifting system to lower the battery pack tray until the battery pack is immersed in the fire extinguishing liquid in the water tank.

[0028] In one embodiment, the lithium battery safety alarm and disposal method further includes the following steps:

[0029] Detect the state of the battery pack;

[0030] When the state of the battery pack is abnormal, determine the position of the battery pack with the abnormality;

[0031] Move the plurality of support frames on the slide rail until the detection device and the danger handling device are closest to the battery pack with the abnormality.

[0032] One embodiment of the present application further provides a lithium battery safety alarm and disposal device, including:

[0033] A workbench for carrying the battery pack, the workbench includes a water tank, a battery pack tray arranged on the water tank, and a lifting system for driving the battery pack tray to move up and down in the water tank. The water tank is provided with fire extinguishing liquid. The battery pack tray is above the fire extinguishing liquid when the battery pack is in a normal state, and the battery pack tray is immersed in the fire extinguishing liquid when the battery pack is in an abnormal state;

[0034] Safety cover, which is arranged above the workbench and encloses the tabletop of the workbench. The safety cover includes slide rails arranged on the workbench, a plurality of support frames sliding on the slide rails, and an outer frame fireproof cloth covering the plurality of support frames. The plurality of support frames are connected by a telescopic hinge mechanism, and the telescopic hinge mechanism is used to change the distance between the plurality of support frames. A detection device and a danger handling device are arranged on the plurality of support frames. The detection device is used to detect the state of the battery pack, and the danger handling device is used to handle the danger of the battery pack. The detection device includes one or more of the following: temperature sensor, smoke sensor, infrared thermal imaging camera. The danger handling device includes one or more of the following: CO2 fire extinguishing device, liquid nitrogen fire extinguishing device, water agent spraying device, poisonous gas neutralization spraying device; and

[0035] Control device, which is used to select one or more of the danger handling devices to handle the battery pack according to the detection results of the detection device, and the control device is used to execute the steps of the lithium battery safety alarm and disposal method described in any one of the above embodiments.

[0036] In one embodiment, the lithium battery safety alarm and disposal device further includes:

[0037] Water treatment device, which is arranged inside the water tank and is used to treat the fire-fighting liquid in the water tank. The water treatment device includes a filter screen, water treatment flocculant, activated carbon and a reverse osmosis membrane. The mesh size of the filter screen is between 200 mesh and 400 mesh. After the fire-fighting liquid in the water tank is roughly filtered by the filter screen, it is then finely filtered by the activated carbon and the reverse osmosis membrane, and then discharged to the external environment.

[0038] In one embodiment, the water treatment flocculant includes at least one of polyferric sulfate and polyacrylamide, and the addition amount of the polyferric sulfate or the polyacrylamide is in the range of 0.5 - 20mg / L.

[0039] In one embodiment, the spraying liquid sprayed by the poisonous gas neutralization spraying device is composed of 1 - 10% sodium carbonate solution and 1 - 10% sodium thiosulfate solution.

[0040] In one embodiment, the lithium battery safety alarm and disposal device further includes:

[0041] Explosion-proof pressure relief device, which is arranged on the safety cover;

[0042] The control device is further used to execute the following steps:

[0043] Detect the pressure inside the safety cover;

[0044] If the pressure inside the safety cover is greater than a preset value, the explosion-proof pressure relief device is activated to release the pressure inside the safety cover to the external environment.

[0045] One embodiment of the present application further provides a lithium battery safety alarm and disposal system, including:

[0046] A detection device for detecting the state of the battery pack;

[0047] A danger handling device for handling the danger of the battery pack; and

[0048] A control device for selecting one or more of the danger handling devices to handle the battery pack according to the detection result of the detection device, and the control device executes the lithium battery safety alarm and disposal method described in any one of the above embodiments.

[0049] The lithium battery safety alarm and disposal system, method and device of the present application have the following advantages and beneficial effects:

[0050] 1. In the lithium battery safety alarm and disposal method provided by the present application, by setting the first temperature range, the second temperature range, the third temperature range and the fourth temperature range, when the temperature of the battery pack is within the first temperature range, the CO2 fire extinguishing device is used to extinguish the fire of the battery pack; when the temperature of the battery pack is within the second temperature range, the liquid nitrogen fire extinguishing device is used to cool down and extinguish the fire of the battery pack; when the temperature of the battery pack is within the third temperature range, the CO2 fire extinguishing device, the liquid nitrogen fire extinguishing device and the water spray device are simultaneously used to cool down and extinguish the fire of the battery pack; when the temperature of the battery pack is within the fourth temperature range, the lifting system is activated to lower the battery pack tray until the battery pack is immersed in the fire extinguishing liquid in the water tank. That is, for battery packs in different temperature ranges, different methods of cooling and fire extinguishing are used for treatment. The above methods can accurately select different levels of cooling and fire extinguishing means according to the different states of the battery pack, so as to achieve precise monitoring and treatment of the safety risks of lithium batteries.

[0051] 2. In the lithium battery safety alarm and disposal method provided by the present application, by setting a water tank, a battery pack pallet, and a lifting system on the workbench, when the lithium battery has a serious fault (i.e., the temperature of the battery pack is in the fourth temperature range), the lifting system can drive the battery pack pallet to descend until the battery pack is immersed in the fire extinguishing liquid in the water tank. The above method can be adopted when the CO2 fire extinguishing device, the liquid nitrogen fire extinguishing device, and the water-based sprinkler device cannot effectively control the temperature of the battery pack, thereby preventing the performance of the lithium battery from further deteriorating in the abnormal state, and thus avoiding dangers such as fire or explosion.

[0052] 3. In one embodiment, the lithium battery safety alarm and disposal device is provided with a temperature sensor to detect the heating rate of the battery pack through the temperature sensor. At this time, by setting a first preset value and a second preset value for the heating rate, when the heating rate of the battery pack is greater than the first preset value, the CO2 fire extinguishing device is used to extinguish the fire of the battery pack; when the heating rate of the battery pack after being extinguished by the CO2 fire extinguishing device is greater than the second preset value, the lifting system is started to lower the battery pack pallet until the battery pack is immersed in the fire extinguishing liquid in the water tank. That is, when the heating rate of the battery pack is greater than the first preset value, it indicates that the battery pack has an abnormality and the CO2 fire extinguishing device is required to extinguish the fire. After the fire extinguishing treatment, if the temperature of the battery pack continues to rise, such as the heating rate is greater than the second preset value, at this time, it indicates that ordinary cooling means are no longer effective, and the battery pack needs to be immersed in the fire extinguishing liquid in the water tank. The above method can accurately select different levels of cooling and fire extinguishing means according to the different heating rates of the battery pack, so as to achieve precise monitoring and treatment of the safety risks of lithium batteries.

[0053] 4. In one embodiment, the lithium battery safety alarm and disposal device is provided with a smoke sensor to detect whether the battery pack has a smoking abnormality through the smoke sensor. If the battery pack has a smoking abnormality, the CO2 fire extinguishing device, the liquid nitrogen fire extinguishing device, and the water-based sprinkler device are simultaneously used to cool and extinguish the fire of the battery pack, and the gas neutralization sprinkler device is used to neutralize the poisonous gas of the battery pack. In practice, if the battery pack has a smoking abnormality, it indicates that the abnormal state of the battery pack is relatively serious. At this time, it is necessary to simultaneously use the CO2 fire extinguishing device, the liquid nitrogen fire extinguishing device, and the water-based sprinkler device to cool and extinguish the fire of the battery pack, and use the gas neutralization sprinkler device to neutralize the poisonous gas of the battery pack. The above method can accurately select appropriate cooling and fire extinguishing means according to the smoking abnormality of the battery pack and perform gas neutralization treatment, so as to achieve precise monitoring and treatment of the safety risks of lithium batteries.

[0054] 5. In one embodiment, the lithium battery safety alarm and disposal device is provided with an infrared thermal imaging camera to detect whether the battery pack catches fire abnormally. When the battery pack catches fire abnormally, the lifting system can drive the battery pack pallet to descend until the battery pack is immersed in the fire extinguishing liquid in the water tank. In practice, if the battery pack catches fire abnormally, it indicates that the abnormal state of the battery pack has become extremely serious and may even explode in a short period of time. At this time, it is necessary to immerse the battery pack in the fire extinguishing liquid in the water tank to extinguish the fire and prevent the fire from spreading. The above method can accurately immerse the battery pack in the fire extinguishing liquid in the water tank according to the abnormal fire of the battery pack, so as to realize the precise monitoring and treatment of the safety risks of lithium batteries.

[0055] 6. In one embodiment, the lithium battery safety alarm and disposal method also detects the state of the battery pack. When the state of the battery pack is abnormal, the position of the battery pack with the abnormality is determined. After determining the position of the battery pack with the abnormality, the plurality of support frames are moved on the slide rail until the detection device and the danger handling device are closest to the battery pack with the abnormality. In practice, the detection device and the danger handling device do not have a one-to-one correspondence with the battery pack. It is possible that one detection device or one danger handling device corresponds to multiple battery packs. At this time, when the state of one battery pack is abnormal, precise detection of this battery pack is particularly necessary. In this embodiment, after determining the position of the battery pack with the abnormality, the plurality of support frames are moved on the slide rail until the detection device and the danger handling device are closest to the battery pack with the abnormality. At this time, the detection device is closest to the battery pack with the abnormality, and the obtained detection result is more accurate. Moreover, the danger handling device is also closest to the battery pack with the abnormality, and its effect will be better when it conducts fire extinguishing or cooling treatment.

[0056] 7. In one embodiment, by arranging a water treatment device inside the water tank, the fire extinguishing liquid in the water tank can be treated. Specifically, the water treatment device includes a filter screen, a water treatment flocculant, activated carbon, and a reverse osmosis membrane. During the process of replacing the fire extinguishing liquid in the water tank, the fire extinguishing liquid in the water tank is roughly filtered by the filter screen, and then finely filtered by the activated carbon and the reverse osmosis membrane, and then discharged to the external environment. At this time, the water roughly filtered by the filter screen is further finely filtered by the activated carbon and the reverse osmosis membrane, and the water quality meets the "Quality Standard for Wastewater Discharged into Urban Sewers (GB / T 31962 - 2015)" and can be directly discharged to the external environment. Description of the Drawings

[0057] The accompanying drawings described herein are used to provide a further understanding of the present application, and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application, and do not constitute an improper limitation to the present application. In the drawings:

[0058] Figure 1 is a schematic structural diagram of a lithium battery safety alarm and disposal device disclosed in one embodiment of the present application;

[0059] Figure 2 is Figure 1 a schematic structural diagram of the lithium battery safety alarm and disposal device in after removing the outer frame fireproof cloth;

[0060] Figure 3 is Figure 1 a schematic structural diagram of the workbench in ;

[0061] Figure 4 is Figure 3 a schematic structural diagram of the battery pack support plate in ;

[0062] Figure 5 is Figure 3 a schematic structural diagram of the water tank in ;

[0063] Figure 6 is Figure 2 a top view schematic diagram of the lithium battery safety alarm and disposal device in ;

[0064] Figure 7 is Figure 6 a sectional view schematic diagram of the lithium battery safety alarm and disposal device in along the A-A direction;

[0065] Figure 8 is Figure 1 a schematic structural diagram of the safety cover after removing the outer frame fireproof cloth in ;

[0066] Figure 9 is a module schematic diagram of a lithium battery safety alarm and disposal device disclosed in one embodiment of the present application;

[0067] Figure 10 is a schematic diagram of one step of a lithium battery safety alarm and disposal method disclosed in one embodiment of the present application;

[0068] Figure 11 is a schematic diagram of another step of a lithium battery safety alarm and disposal method disclosed in one embodiment of the present application;

[0069] Figure 12 is a schematic diagram of yet another step of a lithium battery safety alarm and disposal method disclosed in one embodiment of the present application;

[0070] Figure 13 Another step schematic diagram of the lithium battery safety alarm and disposal method disclosed in one embodiment of the present application;

[0071] Figure 14 Another step schematic diagram of the lithium battery safety alarm and disposal method disclosed in one embodiment of the present application;

[0072] Figure 15 Another step schematic diagram of the lithium battery safety alarm and disposal method disclosed in one embodiment of the present application. Detailed implementation manners

[0073] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0074] It should be noted that the terms used herein are only for describing specific implementation manners and are not intended to limit the exemplary implementation manners according to the present application. As used herein, unless otherwise clearly specified in the context, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0075] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and devices should be regarded as part of the authorization specification. In all the examples shown and discussed here, any specific value should be interpreted as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0076] One embodiment of the present application provides a lithium battery safety alarm and disposal method for a lithium battery safety alarm and disposal device 100. Please refer to Figures 1 to 8 , the lithium battery safety alarm and disposal device 100 includes a workbench 110, a safety cover 120, and a control device 130.

[0077] The workbench 110 is used to carry the battery pack. The workbench 110 includes a water tank 111, a battery pack support plate 112 disposed on the water tank 111, and a lifting system 113 for driving the battery pack support plate 112 to move up and down in the water tank 111. A fire extinguishing liquid (not shown in the figure) is provided in the water tank 111. The battery pack support plate 112 is located above the fire extinguishing liquid when the battery pack is in a normal state. The battery pack support plate 112 is immersed in the fire extinguishing liquid when the battery pack is in an abnormal state.

[0078] In this embodiment, the battery pack tray 112 is a mesh structure. The purpose of setting the battery pack tray 112 as a mesh structure is that when the battery pack tray 112 descends in the water tank 111, the fire extinguishing liquid in the water tank 111 can move from the lower surface to the upper surface of the battery pack tray 112 through the mesh holes of the battery pack tray 112, so that the battery pack tray 112 can be effectively immersed in the fire extinguishing liquid. Specifically, a battery pack fixing device 114 is further provided on the battery pack tray 112. The battery pack fixing device 114 is used to fix the battery pack on the upper surface of the battery pack fixing device 114. When the battery pack tray 112 descends in the water tank 111, the battery pack will also descend with the battery pack tray 112 until the battery pack is completely immersed in the fire extinguishing liquid in the water tank 111. Specifically, the battery pack tray 112 includes a lifting platform 1121 and a support mesh 1122. The lifting platform 1121 is used to enable the battery pack tray 112 to effectively rise or descend in the water tank 111. The support mesh 1122 is fixed on the lifting platform 1121 and is used to enable the battery pack to be stably placed on the battery pack tray 112. In this embodiment, a sliding mechanism 1123 is provided around the lifting platform 1121, and the sliding mechanism 1123 is arranged on the guide rail 1111 on the inner wall of the water tank 111, so as to realize the rising or descending of the lifting platform 1121 in the water tank 111. Specifically, the lifting platform 1121 is a rectangular structure, and two sliding mechanisms 1123 are arranged on each side of it. The inner wall of the water tank 111 is also provided with corresponding guide rails 1111, so that the lifting platform 1121 can rise or descend smoothly in the water tank 111. In this embodiment, a fixing part 1124 is arranged at the middle position of the lifting platform 1121, and the fixing part 1124 is used to connect with the lifting system 113, so that the lifting system 113 can drive the lifting platform 1121 to rise or descend. Specifically, the lifting system 113 includes a driving part 1131 and a telescopic shaft 1132. The driving part 1131 is used to drive the telescopic shaft 1132 to extend or shorten. The telescopic shaft 1132 is fixedly connected to the fixing part 1124 of the lifting platform 1121. When the telescopic shaft 1132 shortens, the telescopic shaft 1132 can drive the lifting platform 1121 to descend, so that the battery pack is immersed in the fire extinguishing liquid in the water tank 111. When the telescopic shaft 1132 extends, the telescopic shaft 1132 can drive the lifting platform 1121 to rise, so that the battery pack tray 112 and the battery pack can return to the normal position.

[0079] The safety cover 120 is disposed above the workbench 110 and encloses the tabletop of the workbench 110. The safety cover 120 includes a slide rail 121 disposed on the workbench 110, a plurality of support frames 122 slidable on the slide rail 121, and an outer frame fireproof cloth 123 covering the plurality of support frames 122. The plurality of support frames 122 are connected by a telescopic hinge mechanism 1221. The telescopic hinge mechanism 1221 is used to change the distance between the plurality of support frames 122. A detection device 140 and a danger handling device 150 are disposed on the plurality of support frames 122. The detection device 140 is used to detect the state of the battery pack. The danger handling device 150 is used to handle the danger of the battery pack. The detection device 140 includes one or more of the following: a temperature sensor, a smoke sensor, and an infrared thermal imaging camera. The danger handling device 150 includes one or more of the following: a CO2 fire extinguishing device, a liquid nitrogen fire extinguishing device, an aqueous agent spraying device, and a poisonous gas neutralization spraying device.

[0080] In this embodiment, the support frame 122 includes two vertical side rods 1222 and a top rod 1223 connected between the two vertical side rods 1222. A sliding wheel is disposed at the bottom of the side rod 1222, so that the support frame 122 can move on the slide rail 121. The telescopic hinge mechanism 1221 can be disposed either between the two side rods 1222 of two adjacent support frames 122 or between the two top rods 1222 of two adjacent support frames 122, so as to change the distance between two adjacent support frames 122.

[0081] In this embodiment, the detection device 140 includes a temperature sensor 141, a smoke sensor 142, and an infrared thermal imaging camera 143. The temperature sensor 141 is used to detect the temperature of the battery pack located on the workbench 110. The smoke sensor 142 is used to detect whether there is abnormal smoking of the battery pack on the workbench 110. The infrared thermal imaging camera 143 is used to detect whether there is abnormal ignition of the battery pack on the workbench 110. Specifically, the temperature sensor 141, the smoke sensor 142, and the infrared thermal imaging camera 143 are arranged on the top rod 1223 of the support frame 122. As required, the temperature sensor 141, the smoke sensor 142, and the infrared thermal imaging camera 133 can also be arranged at other positions to facilitate the detection of the battery pack. In this embodiment, the temperature sensor 131, the smoke sensor 132, and the infrared thermal imaging camera 143 can be arranged on each support frame 122 to facilitate the detection of the state of the battery pack. As required, the temperature sensor 141, the smoke sensor 142, and the infrared thermal imaging camera 143 can also be arranged on one or more of the support frames 122 to detect the state of the battery pack. When only a small number of support frames 122 are provided with the temperature sensor 141, the smoke sensor 142, and the infrared thermal imaging camera 143, if an abnormal state of the battery pack is detected, the position of the battery pack with the abnormal state can be determined first, and then the support frame 122 provided with the temperature sensor 141, the smoke sensor 142, and the infrared thermal imaging camera 143 can be moved to the position of the battery pack with the abnormal state. At this time, the temperature sensor 141, the smoke sensor 142, and the infrared thermal imaging camera 143 are closest to the battery pack with the abnormality, and the obtained detection result is more accurate.

[0082] In this embodiment, the danger handling device 150 includes a CO2 fire extinguishing device 151, a liquid nitrogen fire extinguishing device 152, an aqueous agent spraying device 153, and a poisonous gas neutralizing spraying device 154. The CO2 fire extinguishing device 151 is used to spray CO2 fire extinguishing agent for fire extinguishing when the battery pack is abnormal. The liquid nitrogen fire extinguishing device 152 is used to spray liquid nitrogen for fire extinguishing when the battery pack is abnormal. The sprayed liquid nitrogen can quickly cool the battery pack while creating an inert environment for the entire workbench 110, thereby preventing the state of the battery pack from deteriorating further. The aqueous agent spraying device 153 is used to spray water onto the battery pack when the battery pack is abnormal to achieve the purpose of cooling and fire extinguishing. The poisonous gas neutralizing spraying device 154 is used to spray poisonous gas neutralizing spraying liquid when the battery pack smokes abnormally to prevent the diffusion of poisonous gas. In this embodiment, the poisonous gas neutralizing spraying liquid sprayed by the poisonous gas neutralizing spraying device 154 is composed of 1-10% sodium carbonate solution and 1-10% sodium thiosulfate solution. It can be understood that the poisonous gas spraying liquid can also be composed of other solutions as long as it can effectively neutralize the poisonous gas generated when the battery pack smokes abnormally. Specifically, the CO2 fire extinguishing device 151 and the liquid nitrogen fire extinguishing device 152 are arranged on the side rod 1222 of the support frame 122. The aqueous agent spraying device 153 and the poisonous gas neutralizing spraying device 154 are arranged on the top rod 1223 of the support frame 122. According to needs, the CO2 fire extinguishing device 151, the liquid nitrogen fire extinguishing device 152, the aqueous agent spraying device 153, and the poisonous gas neutralizing spraying device 154 can also be arranged at other positions to facilitate the detection of the battery pack. In this embodiment, the CO2 fire extinguishing device 151, the liquid nitrogen fire extinguishing device 152, the aqueous agent spraying device 153, and the poisonous gas neutralizing spraying device 154 can be arranged on each support frame 122 to facilitate the detection of the state of the battery pack. According to needs, the CO2 fire extinguishing device 151, the liquid nitrogen fire extinguishing device 152, the aqueous agent spraying device 153, and the poisonous gas neutralizing spraying device 154 can also be arranged on one or more support frames 122 to achieve the detection of the state of the battery pack.When only a small number of support frames 122 are provided with the CO2 fire extinguishing device 151, the liquid nitrogen fire extinguishing device 152, the water agent spraying device 153, and the poisonous gas neutralizing spraying device 154, if an abnormal state of the battery pack is detected, the position of the battery pack with the abnormal state can be determined first, and then the support frame 122 provided with the CO2 fire extinguishing device 151, the liquid nitrogen fire extinguishing device 152, the water agent spraying device 153, and the poisonous gas neutralizing spraying device 154 can be moved to the position of the battery pack with the abnormal state. At this time, the CO2 fire extinguishing device 151, the liquid nitrogen fire extinguishing device 152, the water agent spraying device 153, and the poisonous gas neutralizing spraying device 154 are closest to the battery pack with the abnormality, and the obtained detection result is more accurate.

[0083] Please also refer to Figure 9 , the control device 130 is used to select one or more of the danger handling devices 150 to handle the battery pack according to the detection result of the detection device 140. The control device 130 is used to execute the steps in the lithium battery safety alarm and disposal method.

[0084] Please also refer to Figure 10 , the steps include:

[0085] Detect the temperature of the battery pack;

[0086] When the temperature of the battery pack is in the first temperature range, use the CO2 fire extinguishing device 151 to extinguish the fire of the battery pack;

[0087] When the temperature of the battery pack is in the second temperature range, use the liquid nitrogen fire extinguishing device 152 to cool down and extinguish the fire of the battery pack;

[0088] When the temperature of the battery pack is in the third temperature range, use the CO2 fire extinguishing device 151, the liquid nitrogen fire extinguishing device 152, and the water agent spraying device 153 to cool down and extinguish the fire of the battery pack at the same time;

[0089] When the temperature of the battery pack is in the fourth temperature range, start the lifting system 113 to lower the battery pack tray 112 until the battery pack is immersed in the fire extinguishing liquid in the water tank 110.

[0090] In the lithium battery safety alarm and disposal method provided in this application, by setting the first temperature range, the second temperature range, the third temperature range, and the fourth temperature range, when the temperature of the battery pack is within the first temperature range, the CO2 fire extinguishing device 151 is used to extinguish the fire of the battery pack; when the temperature of the battery pack is within the second temperature range, the liquid nitrogen fire extinguishing device 152 is used to cool down and extinguish the fire of the battery pack; when the temperature of the battery pack is within the third temperature range, the CO2 fire extinguishing device 151, the liquid nitrogen fire extinguishing device 152, and the water agent spraying device 153 are used simultaneously to cool down and extinguish the fire of the battery pack; when the temperature of the battery pack is within the fourth temperature range, the lifting system 113 is started to lower the battery pack pallet 112 until the battery pack is immersed in the fire extinguishing liquid in the water tank 110. That is, for battery packs in different temperature ranges, different methods of cooling down and extinguishing the fire are used for treatment. The above method can accurately select different levels of cooling down and extinguishing means according to the different states of the battery pack, so as to achieve precise monitoring and treatment of the safety risks of lithium batteries.

[0091] In addition, in this embodiment, by arranging a water tank 111, a battery pack pallet 112, and a lifting system 113 on the workbench 110, when a serious fault occurs in the lithium battery (that is, the temperature of the battery pack is within the fourth temperature range), the lifting system 113 can drive the battery pack pallet 112 to descend until the battery pack is immersed in the fire extinguishing liquid in the water tank 111. The above method can be adopted when the CO2 fire extinguishing device 151, the liquid nitrogen fire extinguishing device 152, and the water agent spraying device 153 are all unable to effectively control the temperature of the battery pack, thereby preventing the performance of the lithium battery from further deteriorating in an abnormal state, and thus avoiding dangers such as fire or explosion.

[0092] It can be understood that in the water tank 111, the addition of the fire extinguishing liquid generally should meet the requirement that when the battery pack pallet 112 descends, the fire extinguishing liquid should quickly move from the lower surface of the battery pack pallet 112 to the upper surface of the battery pack pallet 112. On the other hand, the fire extinguishing liquid in the water tank 111 should also be deep enough so that when the battery pack malfunctions and is immersed in the fire extinguishing liquid, the fire extinguishing liquid can completely cover the battery pack. Therefore, in practice, the liquid level of the fire extinguishing liquid in the water tank 111 should be added to the bottom surface of the lifting platform 1121 of the battery pack pallet 112 as appropriate.

[0093] In one embodiment, the first temperature range is a temperature greater than 45°C and less than or equal to 55°C, the second temperature range is a temperature greater than 55°C and less than or equal to 60°C, the third temperature range is a temperature greater than 60°C and less than or equal to 100°C, and the fourth temperature range is a temperature greater than 100°C. That is, when it is just detected that the temperature of the battery pack is greater than 45°C, the CO2 fire extinguishing device 151 will automatically be used to extinguish the fire of the battery pack. If the temperature of the battery pack continues to rise, such as rising to greater than 55°C, the liquid nitrogen fire extinguishing device 152 will be automatically started for fire extinguishing treatment. The liquid nitrogen sprayed by the liquid nitrogen fire extinguishing device 152 can quickly cool the battery pack while creating an inert environment on the workbench 110 to prevent the state of the battery pack from deteriorating further. If the temperature of the battery pack cannot be controlled and continues to rise above 60°C, at this time, the CO2 fire extinguishing device 151, the liquid nitrogen fire extinguishing device 152, and the water-based spraying device 153 will be started simultaneously. If the temperature of the battery pack still continues to rise until the temperature of the battery pack exceeds 100°C, at this time, it means that the CO2 fire extinguishing device 151, the liquid nitrogen fire extinguishing device 152, and the water-based spraying device 153 have little effect, then the lifting system 113 will be started to lower the battery pack tray 112 until the battery pack is immersed in the fire extinguishing liquid in the water tank 110.

[0094] Please also refer to Figure 11 , in one embodiment, the lithium battery safety alarm and disposal method further includes the following steps:

[0095] Detect the heating rate of the battery pack;

[0096] When the heating rate of the battery pack is greater than the first preset value, use the CO2 fire extinguishing device 151 to extinguish the fire of the battery pack;

[0097] Continue to detect the heating rate of the battery pack;

[0098] When the heating rate of the battery pack after being extinguished by the CO2 fire extinguishing device 151 is greater than the second preset value, start the lifting system 113 to lower the battery pack tray 112 until the battery pack is immersed in the fire extinguishing liquid in the water tank 111.

[0099] In this embodiment, the lithium battery safety alarm and disposal device 110 is provided with a temperature sensor 141 to detect the temperature rise rate of the battery pack. At this time, by setting a first preset value and a second preset value for the temperature rise rate, when the temperature rise rate of the battery pack is greater than the first preset value, the CO2 fire extinguishing device 151 is used to extinguish the fire of the battery pack; when the temperature rise rate of the battery pack after being extinguished by the CO2 fire extinguishing device 151 is greater than the second preset value, the lifting system 113 is activated to lower the battery pack pallet 112 until the battery pack is immersed in the fire extinguishing liquid in the water tank 111. That is, when the temperature rise rate of the battery pack is greater than the first preset value, it indicates that the battery pack has an abnormality and the CO2 fire extinguishing device 151 is required to extinguish the fire. After the fire extinguishing treatment, if the temperature of the battery pack continues to rise, such as the temperature rise rate is greater than the second preset value, at this time, it indicates that ordinary cooling means are no longer effective, and the battery pack needs to be immersed in the fire extinguishing liquid in the water tank 111. The above method can accurately select different levels of cooling and fire extinguishing means according to the different temperature rise rates of the battery pack, so as to achieve precise monitoring and treatment of the safety risks of lithium batteries.

[0100] In this embodiment, the first preset value is 5°C / s, and the second preset value is 2°C / s. That is, when it is just detected that the temperature rise rate of the battery pack is greater than 5°C / s, the CO2 fire extinguishing device 151 will automatically be used to extinguish the fire of the battery pack. If the temperature of the battery pack continues to rise, it indicates that the CO2 fire extinguishing device 151 has little effect. At this time, due to the action of the CO2 fire extinguishing device 151, the temperature rise rate of the battery pack may be lower than the first preset value. At this time, the temperature rise rate of the battery pack after being extinguished by the CO2 fire extinguishing device 151 is detected again. If the temperature rise rate is greater than 2°C / s, at this time, it indicates that the abnormal state of the battery pack is particularly serious, and the lifting system 113 needs to be activated to lower the battery pack pallet 112 until the battery pack is immersed in the fire extinguishing liquid in the water tank 110.

[0101] Please refer to Figure 12 , in one of the embodiments, the lithium battery safety alarm and disposal method further includes the following steps:

[0102] Detect whether the battery pack has a smoking abnormality;

[0103] If so, the CO2 fire extinguishing device 151, the liquid nitrogen fire extinguishing device 152, and the water agent spraying device 153 are simultaneously used to cool and extinguish the fire of the battery pack, and the poisonous gas neutralizing spraying device 154 is used to neutralize the poisonous gas of the battery pack.

[0104] In this embodiment, the lithium battery safety alarm and disposal device 100 is provided with a smoke sensor 142, which is used to detect whether the battery pack has abnormal smoking. If the battery pack has abnormal smoking, the CO2 fire extinguishing device 151, the liquid nitrogen fire extinguishing device 152 and the water agent spraying device 153 are used to cool down and extinguish the fire on the battery pack, and the poison gas neutralization spraying device 154 is used to neutralize the poison gas on the battery pack. In practice, if the battery pack has abnormal smoking, it means that the abnormal state of the battery pack is already relatively serious. At this time, it is necessary to use the CO2 fire extinguishing device 151, the liquid nitrogen fire extinguishing device 152 and the water agent spraying device 153 to cool down and extinguish the fire on the battery pack, and use the poison gas neutralization spraying device 154 to neutralize the poison gas on the battery pack. The above method can accurately select appropriate cooling and fire extinguishing means according to the abnormal smoking of the battery pack and perform poison gas neutralization treatment, so as to realize the accurate monitoring and treatment of the safety risks of lithium batteries.

[0105] Please also refer to Figure 13 , in one of the embodiments, the lithium battery safety alarm and disposal method further includes the following steps:

[0106] Detect whether the battery pack has abnormal ignition;

[0107] If so, start the lifting system 113 to lower the battery pack tray 112 until the battery pack is immersed in the fire extinguishing liquid in the water tank 111.

[0108] In this embodiment, the lithium battery safety alarm and disposal device 100 is provided with an infrared thermal imaging camera 143, which is used to detect whether the battery pack has abnormal ignition. When the battery pack has abnormal ignition, the lifting system 113 can drive the battery pack tray 112 to lower until the battery pack is immersed in the fire extinguishing liquid in the water tank 111. In practice, if the battery pack has abnormal ignition, it means that the abnormal state of the battery pack is extremely serious, and it may even explode in a short time. At this time, it is necessary to immerse the battery pack in the fire extinguishing liquid in the water tank 111 to extinguish the fire and prevent the spread of the fire. The above method can accurately immerse the battery pack in the fire extinguishing liquid in the water tank 111 for treatment according to the abnormal ignition of the battery pack, so as to realize the accurate monitoring and treatment of the safety risks of lithium batteries.

[0109] Please also refer to Figure 14 , in one of the embodiments, the lithium battery safety alarm and disposal method further includes the following steps:

[0110] Detect the state of the battery pack;

[0111] When the state of the battery pack is abnormal, determine the position of the battery pack with the abnormality;

[0112] Move the plurality of support frames 122 on the slide rail 121 until the detection device 140 and the danger handling device 150 are closest to the battery pack with the abnormality.

[0113] In practice, the detection device 140 and the danger handling device 150 do not have a one-to-one correspondence with the battery packs. It is possible that one detection device 140 or one danger handling device 150 corresponds to multiple battery packs. At this time, when the state of one battery pack is abnormal, precise detection of this battery pack is particularly necessary. In this embodiment, after determining the position of the battery pack with the abnormality, move the plurality of support frames 122 on the slide rail 121 until the detection device 140 and the danger handling device 150 are closest to the battery pack with the abnormality. At this time, the detection device 140 is closest to the battery pack with the abnormality, and the obtained detection result is more accurate. Moreover, the danger handling device 150 is also closest to the battery pack with the abnormality, and when it performs fire extinguishing or cooling treatment, its effect will also be better.

[0114] One embodiment of the present application further provides a lithium battery safety alarm and disposal device 100. The lithium battery safety alarm and disposal device 100 includes a workbench 110, a safety cover 120, and a control device 130.

[0115] The workbench 110 is used to carry the battery pack. The workbench 110 includes a water tank 111, a battery pack tray 112 disposed on the water tank 111, and a lifting system 113 that drives the battery pack tray 112 to move up and down in the water tank 111. Firefighting liquid is provided in the water tank 111. The battery pack tray 112 is located above the firefighting liquid when the battery pack is in a normal state, and the battery pack tray 112 is immersed in the firefighting liquid when the battery pack is in an abnormal state.

[0116] The safety cover 120 is arranged above the workbench 110 and encloses the tabletop of the workbench 110. The safety cover 120 includes a slide rail 121 arranged on the workbench 110, a plurality of support frames 122 sliding on the slide rail 121, and an outer frame fireproof cloth 123 covering the plurality of support frames 122. The plurality of support frames 122 are connected by a telescopic hinge mechanism 1221. The telescopic hinge mechanism 1221 is used to change the distance between the plurality of support frames 122. A detection device 140 and a danger handling device 150 are arranged on the plurality of support frames 122. The detection device 140 is used to detect the state of the battery pack. The danger handling device 150 is used to handle the danger of the battery pack. The detection device 140 includes one or more of the following: a temperature sensor, a smoke sensor, and an infrared thermal imaging camera. The danger handling device 150 includes one or more of the following: a CO2 fire extinguishing device, a liquid nitrogen fire extinguishing device, an aqueous agent spraying device, and a poisonous gas neutralizing spraying device.

[0117] The control device 130 is used to select one or more of the danger handling devices 150 to handle the battery pack according to the detection result of the detection device 140. The control device 130 is used to execute the steps of the lithium battery safety alarm and disposal method as described in any one of the above embodiments.

[0118] In one embodiment, the lithium battery safety alarm and disposal device 100 further includes a water treatment device.

[0119] The water treatment device is arranged inside the water tank 111 and is used to treat the fire extinguishing liquid in the water tank 111. The water treatment device includes a filter screen, a water treatment flocculant, activated carbon, and a reverse osmosis membrane. The mesh size of the filter screen is between 200 mesh and 400 mesh. After the fire extinguishing liquid in the water tank passes through the coarse filtration of the filter screen, it then passes through the fine filtration of the activated carbon and the reverse osmosis membrane, and then is discharged to the external environment.

[0120] In this embodiment, by arranging a water treatment device inside the water tank 111, the fire extinguishing liquid in the water tank 111 can be treated. Specifically, the water treatment device includes a filter screen, a water treatment flocculant, activated carbon, and a reverse osmosis membrane. During the process of replacing the fire extinguishing liquid in the water tank 111, the fire extinguishing liquid in the water tank passes through the coarse filtration of the filter screen, then passes through the fine filtration of the activated carbon and the reverse osmosis membrane, and then is discharged to the external environment. At this time, the water after coarse filtration by the filter screen passes through the fine filtration of the activated carbon and the reverse osmosis membrane, and the water quality meets the "Quality Standard for Wastewater Discharged into Urban Sewers (GB / T 31962-2015)" and can be directly discharged to the external environment.

[0121] In this embodiment, the water treatment flocculant includes at least one of polyferric sulfate and polyacrylamide, and the addition amount of the polyferric sulfate or the polyacrylamide is in the range of 0.5-20 mg / L.

[0122] In this embodiment, the toxic gas spray liquid sprayed by the toxic gas neutralization spraying device is composed of a 1-10% sodium carbonate solution and a 1-10% sodium thiosulfate solution.

[0123] Please refer to Figure 1 , in one of the embodiments, the lithium battery safety alarm and disposal device 100 further includes an explosion-proof pressure relief device 160.

[0124] The explosion-proof pressure relief device 160 is disposed on the safety cover 120.

[0125] Please refer to Figure 15 , at this time, the control device 130 is further configured to perform the following steps:

[0126] Detect the pressure inside the safety cover 120;

[0127] If the pressure inside the safety cover 120 is greater than a preset value, the explosion-proof pressure relief device 160 is opened to release the pressure inside the safety cover 120 to the external environment.

[0128] In this embodiment, by providing the explosion-proof pressure relief device 160 on the safety cover 120, when the battery pack explodes, the pressure inside the safety cover 120 will increase sharply. When the pressure inside the safety cover 120 is greater than the preset value, the explosion-proof pressure relief device 160 is opened to slowly release the pressure inside the safety cover 120 to the external environment. Since there is the safety cover 120 as a buffer, even if the battery pack explodes, it will not significantly affect the external environment. And, after the battery pack explosion occurs, the explosion-proof pressure relief device 160 can be opened to slowly release the pressure inside the safety cover 120 to the external environment.

[0129] It can be understood that the lithium battery safety alarm and disposal device 100 can be used as a repair, disassembly or storage platform for the battery pack. After the control device 130 receives the status information of the battery pack detected by the detection device 140 such as the temperature sensor 141, the smoke sensor 142, and the infrared thermal imaging camera 133, etc., it can not only control the danger handling device 150 to handle the battery pack, but also send a monitoring signal to the outside to remind the outside staff to process it as soon as possible. That is, the control device 130 can be used to monitor the smoke and abnormal temperature in the initial stage of the fire and automatically send a monitoring signal.

[0130] Understandably, the lithium battery safety alarm and disposal device 100 is also connected to various control systems, including but not limited to fire hydrant buttons, fire alarms, various input / output modules, remote cloud monitoring systems, fire monitoring systems, mobile phone APPs, fire electrical control devices, CO2 fire extinguishing devices, liquid nitrogen fire extinguishing devices, water agent spraying devices and other fire extinguishing devices and toxic gas spraying devices. The corresponding devices will be automatically activated after detecting a fire, and corresponding fire-fighting measures will be activated according to different danger levels.

[0131] As needed, the lithium battery safety alarm and disposal device 100 is also connected to a big data platform to perform multi-faceted and multi-dimensional management of the temperature, smoke and fire data obtained from monitoring in terms of collection, storage, calculation, application, management and transmission. Specifically, the big data platform includes but is not limited to a fire-fighting Internet of Things system of a computer, a communication network and a terminal receiver, which can perform remote monitoring. When abnormal temperature rise, smoking and fire occur in the battery pack, it can respond quickly and feedback the abnormal information to the safety center of the fire brigade and the defined safety person in charge. After analyzing the data, the safety person in charge can decide whether to perform manual intervention or automatic management by the intelligent system.

[0132] One embodiment of the present application also provides a lithium battery safety alarm and disposal system. The lithium battery safety alarm and disposal system includes a detection device 140, a danger situation processing device 150 and a control device 130.

[0133] The detection device 140 is used to detect the state of the battery pack;

[0134] The danger situation processing device 150 is used to perform danger situation processing on the battery pack.

[0135] The control device 130 is used to select one or more of the danger situation processing devices 150 to process the battery pack according to the detection result of the detection device 140, and the control device 130 executes the lithium battery safety alarm and disposal method described in any one of the above embodiments.

[0136] For ease of description, spatial relative terms, such as "above", "over", "on the upper surface", "upper", etc., may be used herein to describe the spatial positional relationship of one device or feature to other devices or features as shown in the figures. It should be understood that the spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is inverted, a device described as "above" or "over" other devices or structures will then be positioned "below" or "under" the other devices or structures. Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations of the spatial relative descriptions used herein will be made.

[0137] In addition, it should be noted that the use of terms such as "first" and "second" to define components is only for the convenience of distinguishing the corresponding components. Without additional statements, the above terms have no special meanings and therefore should not be construed as limiting the scope of protection of this application.

[0138] The above are only the preferred embodiments of this application and are not intended to limit this application. For those skilled in the art, this application can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of this application shall be included within the scope of protection of this application.

Claims

1. A method for lithium battery safety alarm and disposal, which is used for a lithium battery safety alarm and disposal device, and is characterized in that, The lithium battery safety alarm and disposal device includes: A workbench for carrying a battery pack. The workbench includes a water tank, a battery pack support plate arranged on the water tank, and a lifting system for driving the battery pack support plate to move up and down in the water tank. Firefighting liquid is provided in the water tank. The battery pack support plate is located above the firefighting liquid when the battery pack is in a normal state, and is immersed in the firefighting liquid when the battery pack is in an abnormal state; A safety cover is arranged above the workbench and encloses the tabletop of the workbench. The safety cover includes a slide rail arranged on the workbench, a plurality of support frames sliding on the slide rail, and an outer frame fireproof cloth covering the plurality of support frames. The plurality of support frames are connected by a telescopic hinge mechanism, and the telescopic hinge mechanism is used to change the distance between the plurality of support frames. A detection device and a danger handling device are arranged on the plurality of support frames. The detection device is used to detect the state of the battery pack, and the danger handling device is used to handle the danger of the battery pack. The detection device includes one or more of the following: a temperature sensor, a smoke sensor, an infrared thermal imaging camera. The danger handling device includes one or more of the following: a CO2 fire extinguishing device, a liquid nitrogen fire extinguishing device, a water agent spraying device, a poisonous gas neutralizing spraying device; and A control device, which is used to select one or more of the danger handling devices to handle the battery pack according to the detection result of the detection device, and the control device is used to execute the steps in the method for lithium battery safety alarm and disposal; The steps include: Detecting the temperature of the battery pack; When the temperature of the battery pack is in the first temperature range, using the CO2 fire extinguishing device to extinguish the fire of the battery pack; When the temperature of the battery pack is in the second temperature range, using the liquid nitrogen fire extinguishing device to cool down and extinguish the fire of the battery pack; When the temperature of the battery pack is in the third temperature range, simultaneously using the CO2 fire extinguishing device, the liquid nitrogen fire extinguishing device and the water agent spraying device to cool down and extinguish the fire of the battery pack; When the temperature of the battery pack is in the fourth temperature range, starting the lifting system to lower the battery pack support plate until the battery pack is immersed in the firefighting liquid in the water tank; Among them, the first temperature range is that the temperature is greater than 45°C and less than or equal to 55°C, the second temperature range is that the temperature is greater than 55°C and less than or equal to 60°C, the third temperature range is that the temperature is greater than 60°C and less than or equal to 100°C, and the fourth temperature range is that the temperature is greater than 100°C; The method for lithium battery safety alarm and disposal further includes the following steps: Detecting the heating rate of the battery pack; When the heating rate of the battery pack is greater than a first preset value, using the CO2 fire extinguishing device to extinguish the fire of the battery pack; Continuing to detect the heating rate of the battery pack; When the temperature rise rate of the battery pack after fire extinguishing treatment by the CO2 fire extinguishing device is greater than a second preset value, start the lifting system to lower the battery pack tray until the battery pack is immersed in the fire extinguishing liquid in the water tank; The first preset value is 5°C / s, and the second preset value is 2°C / s.

2. The lithium battery safety alarm and disposal method according to claim 1, characterized in that, It further includes the following steps: Detect whether the battery pack has abnormal smoking; If so, simultaneously use the CO2 fire extinguishing device, the liquid nitrogen fire extinguishing device, and the water-based spray device to cool down and extinguish the fire of the battery pack, and use the poisonous gas neutralization spray device to neutralize the poisonous gas of the battery pack.

3. The lithium battery safety alarm and disposal method according to claim 1, wherein, It further includes the following steps: Detect whether the battery pack has abnormal ignition; If so, start the lifting system to lower the battery pack tray until the battery pack is immersed in the fire extinguishing liquid in the water tank.

4. The lithium battery safety alarm and handling method according to claim 1, characterized in that, It further includes the following steps: Detect the state of the battery pack; When the state of the battery pack is abnormal, determine the position of the battery pack with the abnormality; Move the multiple support frames on the slide rail until the detection device and the danger handling device are closest to the battery pack with the abnormality.

5. A lithium battery safety alarm and disposal device, characterized in that, It includes: A workbench for carrying the battery pack. The workbench includes a water tank, a battery pack tray arranged on the water tank, and a lifting system for driving the battery pack tray to move up and down in the water tank. Fire extinguishing liquid is provided in the water tank. The battery pack tray is above the fire extinguishing liquid when the battery pack is in a normal state, and the battery pack tray is immersed in the fire extinguishing liquid when the battery pack is in an abnormal state; A safety cover is arranged above the workbench and encloses the tabletop of the workbench. The safety cover includes a slide rail arranged on the workbench, multiple support frames sliding on the slide rail, and an outer frame fireproof cloth covering the multiple support frames. The multiple support frames are connected by a telescopic hinge mechanism. The telescopic hinge mechanism is used to change the distance between the multiple support frames. A detection device and a danger handling device are arranged on the multiple support frames. The detection device is used to detect the state of the battery pack, and the danger handling device is used to handle the danger of the battery pack. The detection device includes one or more of the following: a temperature sensor, a smoke sensor, an infrared thermal imaging camera. The danger handling device includes one or more of the following: a CO2 fire extinguishing device, a liquid nitrogen fire extinguishing device, a water-based spray device, a poisonous gas neutralization spray device; And A control device, which is used to select one or more of the danger handling devices to handle the battery pack according to the detection result of the detection device, and the control device is used to execute the steps of the lithium battery safety alarm and disposal method as described in any one of claims 1-4.

6. The lithium battery safety alarm and disposal device according to claim 5, wherein, It further includes: A water treatment device is arranged inside the water tank and is used to treat the fire extinguishing liquid in the water tank. The water treatment device includes a filter screen, a water treatment flocculant, activated carbon, and a reverse osmosis membrane. The mesh size of the filter screen is between 200 mesh and 400 mesh. After the fire extinguishing liquid in the water tank is roughly filtered by the filter screen, it is then finely filtered by the activated carbon and the reverse osmosis membrane, and then discharged to the external environment.

7. The lithium battery safety alarm and disposal device according to claim 6, characterized in that, The water treatment flocculant includes at least one of polyferric sulfate and polyacrylamide, and the addition amount of the polyferric sulfate or the polyacrylamide is in the range of 0.5 - 20 mg / L.

8. The lithium battery safety alarm and disposal device according to claim 5, wherein The spray liquid sprayed by the poisonous gas neutralization spray device is composed of a 1 - 10% sodium carbonate solution and a 1 - 10% sodium thiosulfate solution.

9. The lithium battery safety alarm and disposal device according to claim 5, characterized in that It further includes: An explosion-proof pressure relief device is arranged on the safety cover; The control device is further used to perform the following steps: Detect the pressure inside the safety cover; If the pressure inside the safety cover is greater than a preset value, open the explosion-proof pressure relief device to release the pressure inside the safety cover to the external environment.

10. A lithium battery safety alarm and disposal system, characterized in that, It includes: A detection device is used to detect the state of the battery pack; A danger handling device is used to handle the danger of the battery pack; And A control device is used to select one or more of the danger handling devices to handle the battery pack according to the detection result of the detection device, and the control device executes the steps of the lithium battery safety alarm and disposal method described in any one of claims 1 - 4.

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