Lithium battery fire extinguishing device and new energy power equipment provided with same

Abstract

The utility model discloses a lithium battery fire extinguishing device and new energy power equipment with the same, and the lithium battery fire extinguishing device comprises a medicine storage bag with a built-in cavity, an injection channel communicated with the inside and the outside of the cavity, and a diaphragm arranged in the injection channel or arranged at the joint of the cavity and the injection channel, when the temperature in the battery compartment reaches a preset value or the pressure borne by the battery compartment reaches a first preset value, the diaphragm can be triggered to be opened; or, a medicine storage bag with a built-in cavity is included, and when the temperature in the battery bin reaches the preset value or the pressure borne by the battery bin reaches the third preset value, the medicine storage bag is broken. Air and a fire extinguishing agent for the lithium battery can be injected into the cavity of the medicine storage bag, after the diaphragm is opened or the medicine storage bag is broken, the fire extinguishing agent in the medicine storage bag can be sprayed to the lithium battery, the effect of automatically extinguishing fire in the first time is achieved, loss caused by violent combustion and even explosion due to thermal runaway of the lithium battery is avoided, and the device is simple in structure, low in cost and convenient to popularize. The large-scale popularization is easy.

Description

Technical Field

[0001] The utility model belongs to the technical field of fire extinguishing devices, and relates to a lithium battery fire extinguishing device and a new energy power equipment provided with the device. Background Art

[0002] The development of new energy power equipment (such as new energy vehicles, battery cars, electric bicycles, and green public transportation vehicles, etc.) is getting faster and faster. Many new energy power equipment use rechargeable lithium batteries as the power source, and the rapid development of lithium battery technology in turn promotes the further rapid development of new energy power equipment.

[0003] However, it cannot be ignored that once a lithium battery undergoes thermal runaway, due to the particularity of its internal materials, the fire will exhibit the characteristics of a chemical fire - it does not require oxygen to support combustion. After ignition for a few seconds, it will enter a state of violent combustion, and often accompanied by an explosion phenomenon. At this time, conventional fire extinguishing means are ineffective for it. Moreover, since the fire is already in a state of violent combustion, it is very difficult to extinguish. Therefore, a lithium battery fire extinguishing device is needed to solve the above technical problems. Content of the Utility Model

[0004] To solve the above existing technical problems, the utility model provides a lithium battery fire extinguishing device and a new energy power equipment provided with the device. The lithium battery fire extinguishing device can automatically spray fire extinguishing agent according to the trigger condition, so as to achieve the purpose of quickly and efficiently extinguishing the fire.

[0005] The technical solution adopted by the utility model is as follows:

[0006] A lithium battery fire extinguishing device,

[0007] including a medicine storage bag with a cavity inside, a spray channel communicating the inside and outside of the cavity, and a diaphragm disposed in the spray channel or at the junction of the cavity and the spray channel. The medicine storage bag can be placed in the battery compartment of the power equipment where the lithium battery is placed. The diaphragm is configured such that when the pressure it receives reaches a first preset value or when the temperature in the battery compartment reaches a preset value, the diaphragm can be triggered to open;

[0008] Or, including a medicine storage bag with a cavity inside, the medicine storage bag can be placed in the battery compartment of the power equipment where the lithium battery is placed, and the medicine storage bag is configured such that when the temperature of the battery compartment reaches a preset value or the external force received by the battery compartment reaches a third preset value, the medicine storage bag ruptures;

[0009] The cavity of the medicine storage bag can be used to inject a fire extinguishing agent for lithium batteries or inject an inert gas and a fire extinguishing agent for lithium batteries.

[0010] The diaphragm is configured such that when the temperature of its surrounding environment reaches a preset value, the diaphragm melts.

[0011] The diaphragm is configured such that when the pressure it receives reaches a first preset value, the diaphragm ruptures.

[0012] The lithium battery fire extinguishing device further includes a controller, a temperature sensor and a pressure sensor electrically connected to the controller, a pressure storage gas cylinder, a ventilation pipe, an electric valve connected to the ventilation pipe and electrically connected to the controller. One end of the ventilation pipe is connected to the medicine storage bag and communicates with the cavity, and the other end is connected to the pressure storage gas cylinder. Inert gas is stored in the pressure storage gas cylinder. When the temperature sensor senses that the temperature in the battery compartment reaches a preset value or the pressure sensor detects that the pressure received by the battery compartment reaches a second preset value, the controller controls the electric valve to open, and the inert gas in the pressure storage gas cylinder is injected into the cavity. When the fire extinguishing agent mixed with the inert gas rushes towards the injection channel, the pressure received by the diaphragm reaches the first preset value.

[0013] The second preset value of the pressure is set to 80 - 110 kg.

[0014] The medicine storage bag is configured such that when the temperature in the battery compartment reaches a preset value, the medicine storage bag melts; or, the medicine storage bag is configured such that when the external force applied to the battery compartment reaches a third preset value, the medicine storage bag in the battery compartment is squeezed and ruptured due to the external force; or, the lithium battery fire extinguishing device further includes a controller, a temperature sensor and a pressure sensor electrically connected to the controller, a pressure storage gas cylinder, a ventilation pipe, an electric valve connected to the ventilation pipe and electrically connected to the controller. One end of the ventilation pipe is connected to the medicine storage bag and communicates with the cavity, and the other end is connected to the pressure storage gas cylinder. Inert gas is stored in the pressure storage gas cylinder. When the temperature sensor senses that the temperature in the battery compartment reaches a preset value or the pressure sensor detects that the external force received by the battery compartment reaches a third preset value, the controller controls the electric valve to open, and the inert gas in the pressure storage gas cylinder is injected into the cavity, thereby forming pressure on the medicine storage bag from the inside, and the medicine storage bag is squeezed and ruptured.

[0015] The third preset value of the external force is set to 10 - 15 kg or 80 - 110 kg.

[0016] A plurality of creases are distributed on the outer surface of the medicine storage bag.

[0017] The preset value of the temperature is set to 80 - 110 degrees Celsius.

[0018] When the lithium battery fire extinguishing device includes the diaphragm, a nozzle is provided at one end of the injection channel away from the cavity; preferably, a plurality of diversion grooves are arranged radially along the outlet end face of the nozzle with the outlet as the center, and each diversion groove communicates with the outlet; preferably, the diaphragm is connected to the nozzle.

[0019] A through hole penetrating the inner and outer walls of the cavity is provided on the wall of the medicine storage bag facing the lithium battery side, and the through hole is set as the injection channel.

[0020] A new energy power device includes a battery compartment for placing a lithium battery, and also includes the above lithium battery fire extinguishing device, and the medicine storage bag is placed in the battery compartment; when the diaphragm is triggered to open or the medicine storage bag ruptures, the fire extinguishing agent in the cavity of the medicine storage bag is sprayed on the lithium battery.

[0021] The lithium battery fire extinguishing device designed by the utility model has the following beneficial technical effects because of the above settings:

[0022] 1. When a fire occurs in the lithium battery and the temperature in the battery compartment reaches the preset value or the pressure received by the battery compartment reaches the preset value, the diaphragm will be triggered to open or the medicine storage bag will rupture, so that the fire extinguishing agent in the cavity of the medicine storage bag will automatically spray onto the lithium battery, achieving the effect of automatically and quickly extinguishing the fire in the first time, strangling the fire in the bud, and avoiding the losses caused by the violent combustion or even explosion of the lithium battery due to the fire. In this way, the lithium battery fire extinguishing device of the utility model will greatly reduce the existing thermal runaway, combustion, and explosion safety hazards of lithium batteries in new energy power devices at present, and is worthy of large-scale popularization and application;

[0023] 2. New energy power devices generally involve multiple groups of batteries. By intervening in the fire extinguishing operation in the first time, only the accident lithium battery pack needs to be replaced after the fire is extinguished, and other lithium battery packs do not need to be replaced because they are not implicated, which will greatly reduce the maintenance cost and has very important practical value;

[0024] 3. The device is simply designed, has high triggering efficiency, low cost, and is easy to be popularized on a large scale. Description of the Drawings

[0025] Figure 1 is a schematic structural diagram of the first embodiment of the lithium battery fire extinguishing device of the utility model placed in the battery compartment;

[0026] Figure 2 is an enlarged three-dimensional schematic diagram of the first embodiment of the lithium battery fire extinguishing device of the utility model;

[0027] Figure 3 is according to Figure 1 the enlarged schematic diagram at A in;

[0028] Figure 4 is an enlarged schematic diagram of the nozzle of the lithium battery fire extinguishing device of the utility model;

[0029] Figure 5 is a schematic structural diagram of the second embodiment of the lithium battery fire extinguishing device of the utility model.

[0030] In the figure:

[0031] 1. Medicine storage sac; 11. Through hole; 2. Diaphragm; 3. Battery compartment; 4. Cavity; 5. Nozzle; 6. Temperature control valve / pressure valve; 7. Pressure storage gas cylinder; 8. Vent pipe; 9. Compartment door. Detailed implementation manners

[0032] The present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0033] Embodiment 1:

[0034] The present utility model discloses a lithium battery fire extinguishing device. Referring to Figure 1 、 2 、Figure 3 as shown, it includes a medicine storage sac 1 with a cavity 4 inside, a spraying channel communicating the inside and outside of the cavity 4, and a diaphragm 2 disposed in the spraying channel or at the junction of the cavity 4 and the spraying channel. The medicine storage sac 1 can be placed in the battery compartment of the power equipment where the lithium battery is placed. The cavity 4 can be used to inject air and the fire extinguishing agent for lithium batteries. The diaphragm 2 is arranged such that when the ambient temperature where it is located reaches a preset value, the diaphragm 2 can be triggered to open, and the fire extinguishing agent for lithium batteries mixed with air in the cavity 4 is sprayed onto the lithium battery through the spraying channel.

[0035] In this embodiment, the diaphragm 2 is arranged such that when the temperature in the battery compartment reaches the preset value, the diaphragm 2 melts. Melting is also a way of opening.

[0036] Preferably, the diaphragm 2 is arranged as a fusible alloy sheet, and its melting point is set to be the same as the preset value. Therefore, when the temperature in the battery compartment rises to the preset value, it reaches the melting point of the fusible alloy sheet, and the fusible alloy sheet 2 will melt. The fire extinguishing agent for lithium batteries mixed with air in the cavity 4 is sprayed from the through hole onto the lithium battery pack for fire extinguishing. Because the fire extinguishing agent for lithium batteries in the cavity 4 is mixed with air, there is a certain pressure in the cavity 4 itself. After the diaphragm 2 melts, the fire extinguishing agent for lithium batteries will fall onto the lithium battery in a spraying form, so the fire extinguishing effect is better.

[0037] The fusible alloy sheet can be selected as a bismuth-tin low melting point alloy sheet with a melting point within the above temperature range, or other alloy sheets with a melting point within the above temperature range or other suitable well-known materials can also be selected.

[0038] Preferably, the preset value of the temperature is set to 80 - 110 degrees Celsius, that is, when the temperature in the battery compartment reaches 80 - 110 degrees Celsius, the diaphragm 2 melts. The temperature in the battery compartment rises to the preset value for two reasons. One reason is that there is a fire in the lithium battery, and the other reason is that there is no fire in the lithium battery yet, but due to some reasons (such as high ambient temperature or other reasons), the temperature in the battery compartment is high enough to reach the preset value. Since the normal operating temperature of the lithium battery is 50 - 60 degrees Celsius, and it will be a little higher in hot weather, therefore, in order to extinguish the fire in time when there is really a fire in the lithium battery (for the above-mentioned reason 1) or to spray the fire extinguishing agent in advance to avoid the occurrence of fire (for the above-mentioned reason 2), and at the same time, to avoid the diaphragm 2 being triggered and opened during normal operation, so it is more appropriate to set the preset value of the temperature to 80 - 110 degrees Celsius. Specifically, the preset value can be 85, 90, 95, 100 or 105 degrees Celsius.

[0039] Preferably, a nozzle 5 is provided at one end of the injection channel away from the cavity 4, and the nozzle 5 can be assembled on the injection channel by an interference fit method. The diaphragm 2 is connected to the nozzle 5. When the diaphragm 2 is triggered and opened (i.e., melted), the fire extinguishing agent in the cavity 4 for the lithium battery is sprayed from the through hole through the nozzle 5 towards the lithium battery. By using the nozzle 5, the fire extinguishing agent can be sprayed towards the lithium battery better and faster.

[0040] Preferably, as shown in Figure 4 a plurality of flow guiding grooves 51 are radially arranged on the outlet end face of the nozzle 5 with the outlet 50 as the center, and each flow guiding groove 51 communicates with the outlet 50. With such a setting, when the diaphragm 2 is opened, if the fire extinguishing agent in the cavity 4 is in a liquid state, even when the outlet end face contacts the lithium battery and the liquid fire extinguishing agent cannot be sprayed out from the outlet 50, the liquid fire extinguishing agent can also flow into each flow guiding groove 51 from the outlet 50 and then fall onto the lithium battery to extinguish the fire. That is to say, the setting of the flow guiding grooves 51 can further ensure that the fire extinguishing agent can reach the battery surface as soon as possible to extinguish the fire.

[0041] The connection method between the diaphragm 2 and the nozzle 5 and other designs of the nozzle 5 can be any known and feasible method. Since it is not the inventive point of the present invention, it will not be elaborated here.

[0042] In other embodiments, the diaphragm 2 may not be connected to the nozzle 5, but is separately provided in the injection channel or at the junction of the cavity 4 and the injection channel, and the diaphragm 2 is connected to the medicine storage capsule 1 by an interference fit or other known and feasible methods. When the diaphragm 2 is triggered and opened, the fire extinguishing agent in the medicine storage capsule 1 can also be sprayed towards the lithium battery through the nozzle.

[0043] In this embodiment, a through hole 11 penetrating the inner and outer walls of the cavity 4 is provided on the wall of the medicine storage bag 1 facing the lithium battery side, that is, the through hole 11 communicates the cavity 4 with the battery compartment 3, and the through hole 11 is set as the injection channel. Under normal circumstances, the diaphragm 2 is in a closed state. In this way, the fire extinguishing agent can be separated from the outside world. When the diaphragm 2 melts, the fire extinguishing agent will spray out from the cavity through the through hole 11 to extinguish the fire.

[0044] Preferably, the medicine storage bag 1 is provided with an openable and closable hatch 9. By opening the hatch 9, the fire extinguishing agent for lithium batteries can be loaded into the cavity 4.

[0045] The form of the fire extinguishing agent for lithium batteries in the cavity 4 is not limited, and the specific composition is not limited. As long as it can be used for lithium battery fire extinguishing, it is not specifically limited here.

[0046] Embodiment Two:

[0047] As Figure 5 shown in the second embodiment of the lithium battery fire extinguishing device of the present utility model, different from the first embodiment, the diaphragm 2 is set so that when the pressure it receives reaches the first preset value, the diaphragm 2 can be triggered to open. Further, when the pressure received by the diaphragm 2 reaches the first preset value, it will rupture, and rupture is also a way for the diaphragm to open.

[0048] In this embodiment, only the fire extinguishing agent for lithium batteries can be injected into the cavity of the medicine storage bag 1.

[0049] In this embodiment, the lithium battery fire extinguishing device further includes a controller, a temperature sensor and a pressure sensor (not shown in the figure) electrically connected to the controller, a pressure storage gas cylinder 7, a ventilation pipe 8, and an electric valve 6 connected to the ventilation pipe 8 and electrically connected to the controller. One end of the ventilation pipe 8 is connected to the medicine storage bag 1 and communicates with the cavity 4, and the other end is connected to the pressure storage gas cylinder 7. The pressure storage gas cylinder 7 stores inert gas; when the temperature sensor senses that the temperature in the battery compartment reaches the preset value or the pressure sensor detects that the external force received by the battery compartment reaches the second preset value, the controller controls the electric valve 6 to open, and the inert gas in the pressure storage gas cylinder 7 is injected into the cavity 4. When the fire extinguishing agent mixed with the inert gas rushes towards the injection channel, the pressure received by the diaphragm 2 reaches the first preset value and ruptures.

[0050] The diaphragm 2 can be set as any known and feasible pressure diaphragm, such as a TFE diaphragm, a PVC diaphragm, a silica gel diaphragm, a rubber diaphragm, etc., as long as it can achieve the above functions.

[0051] The temperature sensor and the pressure sensor can be arranged at any suitable position in the battery compartment 3. The number of them can be one each or multiple. If there are multiple ones, they can be distributed at different positions in the battery compartment 3, so as to better sense the temperature inside the battery and the pressure from the outside on the battery compartment. When the battery compartment 3 is subjected to a strong external force (such as external impact or extrusion), the pressure sensor can detect it.

[0052] The preset value of the ambient temperature in this embodiment is the same as the preset value of the ambient temperature described in the first embodiment. The second preset value of the pressure is set to 80 - 110 kg.

[0053] Preferably, the pressure storage gas tank is a micro pressure storage gas tank with a pressure of 5 - 510 MPa. This pressure value is set like this. If it is greater than 510 MPa, it is possible that after the valve is opened, the inert gas in the gas tank will break through the ventilation pipe 8 or the medicine storage bag due to excessive pressure. In this way, the purpose of breaking through the above-mentioned diaphragm cannot be achieved. If the pressure is less than 5 MPa, it is possible that after the valve is opened, the pressure generated by the inert gas in the gas tank entering the cavity 4 and mixing with the lithium battery fire extinguishing agent is not enough to break through the diaphragm 2. Therefore, the setting of 5 - 510 MPa can avoid these situations and can break through the diaphragm 2.

[0054] Because this embodiment adopts the above technical solution, in the normal working condition, when the temperature in the battery compartment is lower than the preset value or the external force received is lower than the second preset value, the electric valve 6 is in the closed state, and the inert gas in the pressure storage gas cylinder 7 will not enter the cavity 4, and the diaphragm 2 is in the closed state, separating the fire extinguisher from the outside; when the temperature in the battery compartment reaches the preset value or the pressure from the outside on the battery compartment reaches the second preset value, the electric valve opens, the inert gas in the pressure storage gas cylinder 7 is injected into the cavity 4, and the fire extinguishing agent mixed with the inert gas rushes towards the spraying channel. The pressure received by the diaphragm 2 reaches the first preset value and breaks, and the fire extinguishing agent sprays towards the lithium battery. Moreover, after the fire extinguishing agent is mixed with the inert gas with increased pressure, its spraying speed is faster, so that the fire can be extinguished faster.

[0055] It should be noted that the ventilation pipe 8 here can extend outside the battery compartment 3, that is, the pressure storage gas tank can also be arranged at a suitable position outside the battery compartment 3, or can be fixed in the battery compartment 3 together with the medicine storage bag 1. No specific limitation is made here, and it can be flexibly adjusted according to actual applications as long as the same function can be achieved.

[0056] The inert gas can be any well-known and feasible inert gas.

[0057] Due to the relatively high preset value of the above pressure, the lithium battery fire extinguishing device in the second embodiment of the present invention can be used for relatively larger new energy power equipment such as new energy electric vehicles and green public transportation vehicles.

[0058] Embodiment 3:

[0059] In this embodiment, the lithium battery fire extinguishing device includes a medicine storage bag 1 with a cavity 4 inside. Inert gas and a fire extinguishing agent for lithium batteries are injected into the cavity 4. The medicine storage bag 1 is arranged such that when the temperature in its battery compartment reaches a preset value or the external force applied to the battery compartment reaches a third preset value, the medicine storage bag 1 ruptures, and the special fire extinguishing agent for lithium batteries mixed with inert gas in the cavity 4 falls onto the lithium battery.

[0060] Specifically, the medicine storage bag 1 is arranged such that when the temperature in the battery compartment reaches a preset value, the medicine storage bag 1 melts, that is, melting is also one form of rupture. Under this setting, the medicine storage bag can be made of any well-known material with a melting point equal to the preset value of the temperature.

[0061] Or, the medicine storage bag 1 is arranged such that when the external force applied to the battery compartment reaches a third preset value, the medicine storage bag 1 inside the battery compartment 3 is squeezed and ruptured due to the external force. Similarly, the external force applied to the battery compartment includes impact force and extrusion force from the outside, etc.

[0062] The medicine storage bag 1 can be made of materials such as TPU, EVA, polyethylene, polyvinyl chloride, etc. Under normal working conditions, it will not rupture; when the battery compartment is subjected to strong external forces such as external impact or extrusion force, the medicine storage bag 1 inside the battery compartment will also be impacted and extruded by the strong external force. When the external force applied to the battery compartment reaches a third preset value, the medicine storage bag 1 inside the battery compartment cannot withstand the action of the external force and is squeezed and ruptured. In this way, it does not affect normal work usually, and can also perform fire extinguishing work after rupturing when the conditions are met.

[0063] The medicine storage bag 1 can also be made of other suitable materials as long as it can achieve the above functions.

[0064] Preferably, a number of creases 11 are distributed on the outer surface of the medicine storage bag 1 (as Figure 2 shown). The setting of these creases 11 enables the medicine storage bag 1 to rupture faster when the condition for the rupture of the medicine storage bag 1 is reached, thereby achieving the effect of faster automatic fire extinguishing.

[0065] In this embodiment, the preset value of the temperature in the battery compartment is the same as the temperature preset value in the first embodiment, and the third preset value of the pressure is 10 - 15 kg. Preferably, the third preset value of the pressure is 12, 13, or 14 kg. Since the third preset value of the pressure is set relatively low and there is only one medicine storage bag 1, the required installation space is small. Therefore, the lithium battery fire extinguishing device in the third embodiment can be used in relatively small new energy power equipment such as electric bicycles and battery cars because the relatively small new energy power equipment itself can withstand relatively small external forces such as impact force and extrusion force, and the battery compartment is also relatively small.

[0066] Fourth Embodiment:

[0067] The difference between this embodiment and the third embodiment is that the cavity of the medicine storage bag is filled with inert gas and the lithium battery fire extinguishing agent. Also, the lithium battery fire extinguishing device in this embodiment further includes a controller, a temperature sensor and a pressure sensor electrically connected to the controller, a pressure storage gas cylinder, a ventilation pipe, and an electric valve (not shown in the figure) electrically connected to the controller and connected to the ventilation pipe. One end of the ventilation pipe is connected to the medicine storage bag and communicates with the cavity, and the other end is connected to the pressure storage gas cylinder. The pressure storage gas cylinder stores inert gas. When the temperature sensor senses that the temperature in the battery compartment reaches the preset value or the pressure sensor detects that the external force received by the battery compartment reaches the third preset value, the controller controls the electric valve to open, and the inert gas in the pressure storage gas cylinder is injected into the cavity, thereby forming pressure on the medicine storage bag 1 from the inside. The medicine storage bag 1 bursts, and the lithium battery fire extinguisher mixed with inert gas is sprayed onto the lithium battery. The connection of the controller, temperature sensor, pressure sensor, pressure storage gas cylinder, ventilation pipe, and electric valve is the same as that in the second embodiment.

[0068] Similarly, the preset value of the temperature is the same as 80 - 110 degrees Celsius in the previous embodiments. The third preset value of the external force can be 80 - 110 kg, or the third preset value can be the same as the second preset value, that is, the third preset value can also be 10 - 15 kg. The different pressure values depend on whether the fire extinguishing device is used in relatively small new energy power equipment such as electric bicycles and battery cars or relatively larger new energy power equipment such as new energy electric vehicles and green public transportation buses. That is to say, the setting of the third preset value should be determined according to the pressure that the corresponding new energy power equipment can withstand.

[0069] The present utility model also discloses a new energy power device, which includes a battery compartment 3 for placing lithium batteries and the above-mentioned lithium battery fire extinguishing device. The medicine storage bag 1 can be relatively fixedly placed in the battery compartment 3 in any known and feasible manner and is located above the lithium battery pack or other suitable positions. Because the above-mentioned setting is adopted for the lithium battery fire extinguishing device, once the temperature in the battery compartment reaches a preset value or the external pressure suffered by the battery compartment reaches a preset value, the diaphragm 2 will be triggered to open (melt or break) or the medicine storage bag 1 will directly break (melt or be squeezed and broken), so that the fire extinguishing agent in the cavity 4 of the medicine storage bag will be quickly sprayed onto the lithium battery. Thus, if the temperature of the battery compartment rises to the preset value due to the fire of the lithium battery, the above operation of the lithium battery fire extinguishing device of the present utility model can achieve the effect of quickly extinguishing the fire at the first time, avoiding the losses caused by the fierce combustion and even explosion due to the fire of the lithium battery; even if there is no fire in the lithium battery, but when the temperature in the battery compartment rises to the preset value due to the high ambient temperature or the external pressure suffered by the battery compartment reaches the preset value, the above operation of the lithium battery fire extinguishing device of the present utility model can nip the possible fire in the bud in advance. Thus, the potential safety hazards of combustion and explosion of lithium batteries in new energy power devices at the present stage will be greatly reduced, and it is worthy of large-scale popularization and application. In addition, new energy power devices generally involve multiple groups of batteries. By intervening in the fire extinguishing operation at the first time, only the accident lithium battery pack needs to be replaced after the fire is extinguished, and other lithium battery packs do not need to be replaced because they are not involved, which will greatly reduce the maintenance cost and has very important practical value. In addition, because the lithium battery fire extinguishing device adopts the above design, its structure is simple, the manufacturing cost is low, and the triggering is efficient, so it is easier to be popularized on a large scale.

[0070] Those skilled in the art should know that in addition to the above-mentioned new energy electric vehicles, battery cars, electric bicycles and green public transport buses, the above-mentioned new energy power device can also be any other device that uses lithium batteries as the power source and is provided with a battery compartment for placing lithium batteries, and no specific limitation is made here.

[0071] The above has described the embodiments of the present utility model in detail, but the above content is only the preferred embodiment of the present utility model and cannot be considered as limiting the scope of implementation of the present utility model. All equivalent changes and improvements made according to the scope of the application of the present utility model should still fall within the scope covered by the patent of the present utility model.

Claims

1. A lithium battery fire extinguishing device, characterized in that: It comprises a medicine storage bag with a cavity inside, an injection channel connecting the inside and outside of the cavity, and a diaphragm arranged in the injection channel or arranged at the intersection of the cavity and the injection channel. The medicine storage bag can be placed in a battery compartment of a power device for placing a lithium battery. The diaphragm is configured so that when the pressure it is subjected to reaches a first preset value or when the temperature in the battery compartment reaches a preset value, the diaphragm can be triggered to open; Or, it includes a medicine storage bag with a built-in cavity, the medicine storage bag can be placed in a battery compartment of a power device for placing a lithium battery, and the medicine storage bag is configured to rupture when the temperature of the battery compartment reaches a preset value or the external force applied to the battery compartment reaches a third preset value; The cavity of the medicine storage capsule can be used to inject a fire extinguishing agent for lithium batteries or inject an inert gas and a fire extinguishing agent for lithium batteries.

2. The lithium battery fire extinguishing device according to claim 1, characterized in that: The diaphragm is configured to melt when the temperature of the environment in which the diaphragm is located reaches a preset value.

3. The lithium battery fire extinguishing device according to claim 1, characterized in that: The diaphragm is configured to rupture when the pressure applied thereto reaches a first preset value.

4. The lithium battery fire extinguishing device according to claim 3, characterized in that: It also includes a controller, a temperature sensor and a pressure sensor electrically connected to the controller, a pressure storage cylinder, a ventilation pipe, and an electric valve connected to the ventilation pipe and electrically connected to the controller, one end of the ventilation pipe is connected to the medicine storage bag and communicates with the cavity, and the other end is connected to the pressure storage cylinder, and the pressure storage cylinder stores inert gas; when the temperature sensor senses that the temperature in the battery compartment reaches a preset value or the pressure sensor detects that the pressure in the battery compartment reaches a second preset value, the controller controls the electric valve to open, and the inert gas in the pressure storage cylinder is injected into the cavity, and when the fire extinguishing agent mixed with the inert gas rushes to the injection channel, the pressure on the diaphragm reaches the first preset value.

5. The lithium battery fire extinguishing device according to claim 4, characterized in that: The second preset value of the pressure is set to 80-110 kg.

6. The lithium battery fire extinguishing device according to claim 1, characterized in that: The medicine storage bag is configured to melt when the temperature in the battery compartment reaches a preset value; or, the medicine storage bag is configured to rupture due to being squeezed by the external force when the external force applied to the battery compartment reaches a third preset value; or, the lithium battery fire extinguishing device further includes a controller, a temperature sensor and a pressure sensor electrically connected to the controller, a pressure storage gas cylinder, a ventilation pipe, and an electric valve connected to the ventilation pipe and electrically connected to the controller, one end of the ventilation pipe is connected to the medicine storage bag and communicates with the cavity, and the other end is connected to the pressure storage gas cylinder, in which inert gas is stored; when the temperature sensor senses that the temperature in the battery compartment reaches a preset value or the pressure sensor detects that the external force applied to the battery compartment reaches a third preset value, the controller controls the electric valve to open, and the inert gas in the pressure storage gas cylinder is injected into the cavity, thereby forming pressure on the medicine storage bag from the inside, and the medicine storage bag is squeezed and ruptured.

7. The lithium battery fire extinguishing device according to claim 6, characterized in that: The third preset value of the external force is set to 10-15 kg or 80-110 kg.

8. The lithium battery fire extinguishing device according to claim 6, characterized in that: A plurality of folds are distributed on the outer surface of the medicine storage bag.

9. The lithium battery fire extinguishing device according to any one of claims 1 to 8, characterized in that: The preset value of the temperature is set to 80-110 degrees Celsius.

10. The lithium battery fire extinguishing device according to any one of claims 1 to 8, characterized in that: When the lithium battery fire extinguishing device includes the diaphragm, a nozzle is provided at one end of the injection channel away from the cavity.

11. The lithium battery fire extinguishing device according to claim 10, characterized in that: The outlet end surface of the nozzle is radially arranged with a plurality of guide grooves with the outlet as the center, and each guide groove is communicated with the outlet.

12. The lithium battery fire extinguishing device according to claim 10, characterized in that: The diaphragm is connected to the nozzle.

13. The lithium battery fire extinguishing device according to any one of claims 1 to 8, 11 to 12, characterized in that: A through hole penetrating the inside and outside of the cavity is provided on the wall of the medicine storage bag facing the lithium battery, and the through hole is set as the injection channel.

14. A new energy power equipment, comprising a battery compartment for placing lithium batteries, characterized in that: It also includes a lithium battery fire extinguishing device as described in any one of claims 1 to 13, wherein the medicine storage bag is placed in the battery compartment; when the diaphragm is triggered to open or the medicine storage bag is ruptured, the fire extinguishing agent in the cavity of the medicine storage bag is sprayed onto the lithium battery.

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