Safety protection device for new energy lithium battery

Abstract

A safety protection device for a new energy lithium battery comprises a box body and a box cover rotationally connected to the box body, the side of the box body is connected with a housing, a space cavity is formed between the housing and the box body, a fire extinguisher is arranged in the space cavity and connected into the box body through a pipeline, a cooling fan is further arranged in the space cavity, and the cooling fan is connected with the box cover through a pipeline. The cooling fan is connected into the box body through a pipeline, and ventilation holes are formed in the bottom of the box body; the cooling fan and the fire extinguisher share the same pipeline, and one of the cooling channel and the fire extinguishing agent channel is opened. According to the invention, the partition box with fire behavior is retained in the box body, the fire extinguishing agent is used for extinguishing fire, and the partition box without fire behavior is pulled out of the box body for protection; connection and positioning of the partition box and dislocation operation when a fire occurs are achieved through the hook tongue assembly, induction is triggered during dislocation so that a fire signal can be sent out, and the partition box where the fire occurs is judged.

Description

Technical Field

[0001] The present invention relates to the field of lithium batteries, and particularly to a safety protection device for new energy lithium batteries. Background Art

[0002] Thermal runaway refers to the phenomenon that under specific conditions, the heat generated by internal chemical reactions in the battery exceeds the heat dissipation capacity of the battery, resulting in a sharp rise in the battery temperature, and then triggering a series of irreversible chemical reactions, which may ultimately lead to the battery catching fire or exploding.

[0003] When thermal runaway occurs in new energy lithium batteries, a large amount of combustible gas will be generated and deflagration will occur, followed by combustion. Currently, in terms of fire and explosion prevention devices for lithium batteries, explosion-proof vent valves for battery cells and cooling and flame retardancy measures for battery stacks are usually provided. However, once deflagration caused by thermal runaway occurs, it is actually difficult to effectively control it through cooling, and it is also difficult to prevent the spread of combustion through the surrounding flame retardant materials. Once deflagration occurs, the combustion will continue. When the lithium battery catches fire and burns, the escaping flames, overheated gases, smoke and toxic gases generated by combustion in all directions will endanger people's lives.

[0004] Currently, an explosion-proof bag is generally used for protection during the charging process. However, the explosion-proof bag generally can only resist low-intensity combustion. It can provide good protection in the initial stage of thermal runaway, but it cannot effectively protect against severe combustion or even explosion. The explosion-proof bag will be torn from the inside and is completely unable to protect the internal lithium battery cluster well.

[0005] The present invention provides a safety protection device for new energy lithium batteries. By sacrificing the portability of the explosion-proof bag, the charging process of the lithium battery is protected by a steel explosion-proof device with non-combustible and good compressive properties, which is applicable to household use or charging and replacement service stations. Summary of the Invention

[0006] In order to solve the problems raised in the background art, the present invention provides a safety protection device for new energy lithium batteries, and the following is a further elaboration of the present invention.

[0007] A safety protection device for a new energy lithium battery comprises a box body and a box cover rotatably connected thereto, a cover shell is connected to the side of the box body, a space cavity for installing equipment is formed between the cover shell and the box body, a fire extinguisher is arranged in the space cavity, the fire extinguisher is connected to the box body through a pipeline, a heat dissipation fan is also arranged in the space cavity, the heat dissipation fan is connected to the box body through a pipeline, and a ventilation hole is arranged at the bottom of the box body; the heat dissipation fan and the fire extinguisher share the same pipeline, the heat dissipation fan is connected to the pipeline through a heat dissipation branch pipe, and the fire extinguisher is connected to the pipeline through a fire extinguishing agent branch pipe, the heat dissipation branch pipe and the fire extinguishing agent branch pipe are respectively movably equipped with a heat dissipation piston member and a fire extinguishing piston member, a state switching member is arranged between the heat dissipation piston member and the fire extinguishing piston member, slide grooves are arranged at both ends of the state switching member, and the middle part is connected to a fixed component through a positioning rod, the heat dissipation piston member and the fire extinguishing piston member are both provided with a first slide column, the first slide column is located in the slide groove, and the heat dissipation channel and the fire extinguishing agent channel are selectively opened.

[0008] Preferably, the box body has multiple groups of compartments built in, each compartment has a built-in lithium battery pack, and a vent is set at the bottom; the compartments are connected by a hook tongue assembly, and the compartments on both sides are connected to the output end of the cylinder by a pull rod respectively, the upper part of the side door is rotatably connected to the box body, and the bottom of the compartment is provided with a roller. When a fire occurs, the compartment is quickly pulled out of the box body by the pull of the cylinder piston rod, and after the compartment is pulled out, the side door is reset under its own weight.

[0009] Preferably, an extension rod is fixedly connected to the outside of the compartment box, the extension rod is of fixed length and has a cavity inside; the hook tongue assembly includes a heat conductor connected to the compartment box, a deformation sheet is connected to the heat conductor, the deformation sheet is built into the extension rod, the deformation sheets of two adjacent compartment boxes are arranged up and down, and the two deformation sheets are connected by a hook tongue, the top of the hook tongue passes through the upper extension rod and cooperates with the sliding, the part of the hook tongue built into the upper extension rod abuts against the end of the deformation sheet, and the bottom of the hook tongue extends to the inside of the lower extension rod and abuts against the end of the deformation sheet. When a fire occurs, the deformation sheet is deformed by heat and pushes the hook tongue upward, so that it is out of cooperation with the lower extension rod, even if the adjacent compartment box connected to the hook tongue assembly is out of cooperation.

[0010] Preferably, a pressing part is provided on the hook tongue, and a sensing part is fixed on the extension rod, and the pressing part presses on the sensing part. When the deformation piece is heated and deformed to make the hook tongue move up and release, the linkage pressing part is out of contact with the sensing part, and the sensing part sends a fire signal.

[0011] Preferably, a balance spring is provided between the hook tongue and the extension rod, and the function of the balance spring is to balance the weight of the hook tongue. When the deformation piece is deformed, the elastic force generated at the end can directly lift the hook tongue.

[0012] Preferably, a handle bar is provided on the top of the hook tongue, and the hook tongue is directly pulled upward to disengage the hook tongue from the extension rod, thereby providing a manual operation mode.

[0013] Preferably, the heat conductors of the tongue components on both sides of the middle partition box are also directly connected by a heat conductor, aiming to enable the tongue components on both sides to be triggered simultaneously when a fire breaks out in the middle partition box.

[0014] Preferably, a movable limiting member is connected to the output end of the cylinder, including a wedge-shaped block. The wedge-shaped block is fixedly connected to the output end of the cylinder through a base. The wedge-shaped block is movably arranged on the base through a fixedly connected second sliding column, and a return spring sleeved outside the second sliding column is arranged between the wedge-shaped block and the base. The relatively enclosed state inside the box body is maintained by the positioning limiting convex and the movable positioning member.

[0015] Preferably, a power-taking beam is arranged inside the box body, and a socket electrically connected to the power-taking beam is arranged on the partition box. The socket can slide on the power-taking beam, and the power-taking beam is electrically connected to the power cord through an electrical connection head; a protective cover is arranged outside the power cord, a dialing foot is connected to the protective cover, a dialing rod is connected to the pull rod, and the end of the dialing rod is an inclined surface, which contacts the dialing foot. After a fire breaks out, while the pull rod moves, the electrical connection head between the power cord and the power-taking beam is disconnected through the extrusion action of the inclined surface at the end of the dialing rod and the dialing foot, completing the power-off operation of the power-taking beam.

[0016] Preferably, any one of the heat dissipation piston member and the fire extinguishing piston member is connected to the protective cover through a direct connection member. When the protective cover is extruded by the dialing foot and pulled out from the electrical connection head, at this time, the state switching member is rotated through the direct connection member in a linkage manner, so that the fire extinguishing pipeline is opened and the heat dissipation pipeline is closed. The state switching of the heat dissipation channel and the fire extinguishing channel is controlled by the extending action of the cylinder in a mechanical linkage control manner.

[0017] Beneficial effects: Compared with the prior art, in the present invention, the partition box where a fire breaks out is retained inside the box body through the box body, and fire extinguishing is carried out with a fire extinguishing agent. The partition boxes without a fire are pulled out of the box body for protection, realizing differential protection of the lithium battery pack; the connection and positioning of the partition box are realized through the tongue component, and the dislocation operation when a fire breaks out is carried out. At the same time of dislocation, the induction is triggered to emit a fire signal to judge the partition box where a fire breaks out; through the action of the cylinder, the partition boxes without a fire are pulled out, and the power-off operation of the box body is linked, and the state switching of the heat dissipation channel and the fire extinguishing channel is linked. Through the mechanical linkage method, the accuracy and stability of the action are ensured. Description of the Drawings

[0018] Figure 1 It is a schematic structural diagram of the safety protection device for new energy lithium batteries described in the present invention; Figure 2 It is a schematic structural diagram of either the heat dissipation channel or the fire extinguishing agent channel in the housing being opened; Figure 3Schematic structural diagram after the lid of the safety protection device described in the present invention is opened; Figure 4 Schematic structural diagram of the cylinder linkage partition box; Figure 5 Schematic structural diagram of the latch assembly; Figure 6 Schematic structural diagram of the positioning and limiting protrusion and the movable limiting member; Figure 7 Schematic structural diagram of the electrical connection between the partition box and the power cord; In the figure: box body 1, lid 2, housing 3, fire extinguisher 4, cooling fan 5, cooling branch pipe 6, fire extinguishing agent branch pipe 7, cooling piston member 8, fire extinguishing piston member 9, state switching member 10, positioning rod 11, first sliding column 12, partition box 13, pull rod 14, cylinder 15, heat conductor 16, deformation piece 17, latch 18, pressing part 181, extension rod 19, sensing member 20, balance spring 21, handle rod 22, side door 23, positioning and limiting protrusion 24, wedge block 25, second sliding column 26, return spring 27, power taking beam 28, socket 29, power cord 30, protective cover 31, dialing foot 32, dialing rod 33, direct connection member 34, base 35. Specific embodiments

[0019] Next, a specific embodiment of the present invention will be elaborated in detail in combination with the attached Figures 1-7 Refer to the attached

[0020] For a safety protection device for new energy lithium batteries, it includes a box body 1 made of non-combustible and pressure-resistant steel and a lid 2 rotatably connected thereto. The lid 2 is connected to the box body 1 by snap connection. A housing 3 is connected to the side of the box body 1, and a space cavity for installing equipment is formed between the housing 3 and the box body 1. A fire extinguisher 4 is provided in the space cavity. The fire extinguisher 4 is connected to the inside of the box body 1 through a pipeline. After a combustion danger occurs during the charging process of the lithium battery pack, the fire extinguishing agent in the fire extinguisher 4 enters the box body 1 through the pipeline for fire extinguishing operations. Figures 1-2 During the charging process of the lithium battery, due to the chemical reaction inside the battery, certain heat will be generated. If the heat cannot be effectively dissipated, the temperature of the battery will rise, thereby affecting the performance and life of the battery, and even triggering safety risks such as battery thermal runaway and explosion. Therefore, in this embodiment, the lithium battery is cooled during the charging process of the lithium battery.

[0021]

[0022] ​Specifically, a cooling fan 5 is also provided in the space cavity. The cooling fan 5 is connected to the inside of the box body 1 through a pipeline. The bottom of the box body 1 is provided with ventilation holes. After the cooling fan 5 is started, the air in the box body 1 is extracted through the air guiding effect, maintaining a slightly negative pressure inside the box body 1. The air outside the box body 1 then enters the box body 1 through the ventilation holes at the bottom, enabling the air flow inside and outside the box body 1 to circulate, and dissipating the heat generated during the lithium battery charging process to the outside of the box body 1.

[0023] When a dangerous situation occurs during the charging process of the lithium battery pack, the fire extinguisher 4 is activated. The extinguishing agent in the fire extinguisher 4 enters the box body 1 through the pipeline for fire extinguishing operations. In this embodiment, the fire extinguisher 4 uses a Class D fire extinguisher. Class D fire extinguishers are specifically used for extinguishing metal fires, and their extinguishing agents usually use special metal extinguishing agents, such as sodium chloride-based powder, graphite-based powder, etc. These extinguishing agents can form a covering layer on the surface of the burning lithium metal, isolate oxygen, prevent the fire from spreading further, and at the same time reduce the combustion temperature of the metal, thereby achieving the purpose of extinguishing the fire and being suitable for extinguishing fires of lithium metal batteries.

[0024] The spraying of the extinguishing agent of the fire extinguisher 4 mainly depends on the internal pressure system. Generally, compressed gas or inert gas is installed inside. These gases are quickly released when the fire extinguisher 4 is activated, generating high pressure to push the extinguishing agent out and enter the box body 1 through the pipeline. The pressure inside the box body 1 will increase sharply. At this time, the ventilation holes also have a pressure relief function.

[0025] In this embodiment, the cooling fan 5 and the fire extinguisher 4 share the same pipeline. The pipeline built in the housing 3 is a fixed pipeline fixed to the housing 3 or the box body 1, aiming to stably transport the gas-fluid. The side from the housing 3 to the box cover 2 is connected through a flexible pipe section, enabling the box cover 2 to rotate and flip up. In the normal state, the cooling fan 5 and the pipeline form an open cooling channel, and the fire extinguisher 4 and the pipeline form a closed fire extinguishing channel, that is, only one of the cooling channel and the fire extinguishing channel can be started. This is to prevent the extinguishing agent from escaping from the open cooling fan 5 when the fire extinguishing channel is started, causing ineffective loss of the extinguishing agent and difficulty in subsequent cleaning of the cooling fan 5.

[0026] The cooling fan 5 is connected to the pipeline through a cooling branch pipe 6, and the fire extinguisher 4 is connected to the pipeline through an extinguishing agent branch pipe 7. The cooling piston part 8 and the fire extinguishing piston part 9 are respectively movably built in the cooling branch pipe 6 and the extinguishing agent branch pipe 7. A state switching part 10 is arranged between the cooling piston part 8 and the fire extinguishing piston part 9. Both ends of the state switching part 10 are provided with chutes, and the middle part is connected to a fixed part, such as the pipe wall of the pipeline in this embodiment, through a positioning rod 11. The state switching part 10 has a rotational freedom and rotates around the connection point with the positioning rod 11. First sliding columns 12 are provided on both the cooling piston part 8 and the fire extinguishing piston part 9, and the first sliding columns 12 are located in the chutes.

[0027] Under normal conditions, that is, when the heat dissipation channel is open and the fire extinguishing agent channel is closed, the heat dissipation piston member 8 is in the extended state, the heat dissipation branch pipe 6 is connected to the pipeline, while the fire extinguishing piston member 9 is in the internal sealing state, and the fire extinguishing agent branch is separated from the pipeline; when a fire occurs, any one of the heat dissipation piston member 8 and the fire extinguishing piston member 9 is actuated by an external force, which will necessarily change the state of the pipeline where it is located, and at the same time, through the state switching member 10, the other member is linked to act to switch the state of the pipeline where the other member is located, so that the heat dissipation channel is in the closed state when the fire extinguishing agent is ejected. In this way, the function of selectively opening the heat dissipation channel and the fire extinguishing agent channel is realized.

[0028] Refer to the appendix Figures 3-4 In this embodiment, to increase the charging efficiency of the lithium battery pack and protect multiple lithium battery packs with a group of fire extinguishers 4, specifically, the box body 1 is internally provided with multiple partition boxes 13 for internally placing lithium battery packs. Ventilation openings are provided at the bottom of the partition boxes 13, which form a channel for air flow communication with the ventilation holes at the bottom of the box body 1.

[0029] The existence of the partition box 13 plays a certain role in isolating the lithium battery. However, after the lithium battery catches fire, the reaction is intense, and it will quickly cause adjacent lithium battery packs to catch fire. In this embodiment, the lithium battery pack with a fire is isolated in the box body 1 alone, and the lithium battery packs without a fire are pulled out of the box body 1. The partition boxes 13 are connected by a tongue and groove assembly, and the two side partition boxes 13 are respectively connected to the output ends of the cylinders 15 through pull rods 14. The cylinder 15 is preferably a double-rod cylinder to realize the function of pulling the two side partition boxes 13 separately or synchronously.

[0030] Under normal circumstances, the fire of the lithium battery pack is a low-probability event. The situation considered in this embodiment is that a certain lithium battery pack catches fire as a dangerous situation. When a dangerous situation occurs, the partition box 13 where the lithium battery pack with the dangerous situation is located is decoupled from the adjacent partition box 13, and the cylinder 15 is triggered to act, pulling out the partition box 13 without the dangerous situation from the box body 1 for isolation protection, while the partition box 13 with the dangerous situation is isolated in the box body 1 for fire extinguishing operation. Considering the stroke and thrust limitations of the cylinder 15, the number of partition boxes 13 in this embodiment is preferably three.

[0031] Rollers are provided at the bottom of the partition box 13. After a fire occurs, the cylinder 15 acts quickly to pull the partition box 13 out of the box body 1. Based on the characteristic that the lithium battery pack is heavy, the role of the rollers is to reduce the friction force so that the partition box 13 can be smoothly pulled out. During normal charging, the partition box 13 is inside the box body 1, and the rollers at the bottom are not restricted to ensure that they can be smoothly pulled out by the cylinder 15. To prevent the partition box 13 from shaking, the partition boxes 13 are connected and positioned by a tongue and groove assembly. On the one hand, the positions of adjacent partition boxes 13 are fixed. On the other hand, when a fire occurs in the lithium battery pack in any partition box 13, the tongue and groove assembly can be triggered to unhook, so that the partition box 13 without fire can be pulled out of the box body 1 for protection.

[0032] Reference Figure 5 Specifically: the hook tongue assembly includes a heat conductor 16 connected to the compartment box 13, the heat conductor 16 is a good conductor of heat, the compartment box 13 is fixedly connected to an extension rod 19, the extension rod 19 is fixed in length, and there is a cavity inside, the heat conductor 16 is connected to a deformable sheet 17, the deformable sheet 17 is built into the extension rod 19, the deformable sheets 17 of two adjacent compartment boxes 13 are arranged up and down, and after being heated, the ends of the deformable sheets 17 will curl upward due to the different thermal expansion coefficients of different materials inside; the two deformable sheets 17 are connected by a hook tongue 18, the top of the hook tongue 18 passes through the upper extension rod 19 and cooperates with it in a sliding manner, the part of the hook tongue 18 built into the upper extension rod 19 abuts against the end of the deformable sheet 17, and the bottom of the hook tongue 18 extends to the inside of the lower extension rod 19 and also abuts against the end of the deformable sheet 17.

[0033] When any lithium battery pack on both sides of the hook tongue assembly catches fire, the temperature rises sharply in a short period of time and is sensed by the heat conductor 16 and conducted to the deformation piece 17. When the deformation amount of the deformation piece 17 is finally reflected to the end after being deformed by heat, one end will be tilted upward, pushing the hook tongue 18 upward and causing it to disengage from the lower extension rod 19, even if the adjacent compartment box 13 connected to the hook tongue assembly is disengaged.

[0034] As mentioned above, after a fire occurs, it is necessary to start the fire extinguisher 4 and turn off the cooling fan 5. The trigger signal comes from the detector. Under normal circumstances, a temperature, smoke or flame detector is generally built into the box 1. Because the lithium battery pack is carried in the compartment 13, the above detectors or sensing space are limited, or there is a certain delay. In this embodiment, the action characteristic of triggering the upward movement of the hook tongue 18 by temperature rise is used, and the setting is set to trigger the sensing member 20 by the tripping of the hook tongue 18. The hook tongue 18 is provided with a pressing portion 181, and a sensing member 20 is fixed on the extension rod 19, and the pressing portion 181 presses on the sensing member 20. When the deformation sheet 17 is deformed by heat and causes the hook tongue 18 to move up and trip, the linkage pressing portion 181 is out of contact with the sensing member 20, and the sensing member 20 sends a fire signal.

[0035] A balance spring 21 is provided between the hook tongue 18 and the extension rod 19. The balance spring 21 is used to balance the weight of the hook tongue 18. When the deformation piece 17 is deformed, the elastic force generated at the end can directly lift the hook tongue 18.

[0036] A handle bar 22 is also provided on the top of the hook tongue 18, and its function is to allow the operator to manually operate and directly pull the hook tongue 18 upward to disengage the hook tongue 18 from the extension rod 19, thereby providing a manual operation mode. In the manual mode, the trigger signal transmitted to the fire extinguisher 4 will be automatically shielded.

[0037] This embodiment triggers the tripping of the hook tongue assembly by temperature rise, and can also trigger the induction component 20 by the action of the hook tongue assembly, which has the advantage of quickly and accurately responding to the occurrence of fire. This embodiment has three compartments 13, and therefore has two sets of hook tongue assemblies, and its judgment logic is as follows: when any of the compartments 13 on both sides catches fire, the hook tongue assembly directly connected (near end) is triggered to trip, and the induction component 20 is triggered to send a signal, while the hook tongue assembly at the far end is not tripped, and the induction component 20 at the far end does not send a fire signal. In this way, according to the status of the two sets of induction components 20, it is determined that the compartment 13 with fire is one of the two sides; when a fire occurs in the middle compartment 13, the hook tongue assemblies on both sides will be triggered to trip at the same time, and the two induction components 20 will be triggered to send signals synchronously, and then it is determined that the fire occurs in the compartment 13 in the middle.

[0038] The heat conductors 16 of the hook and tongue assemblies on both sides of the middle compartment 13 are also directly connected through the heat conductor 16, so that when a fire occurs in the middle compartment 13, the hook and tongue assemblies on both sides can be triggered at the same time.

[0039] Reference Figure 4 , Figure 6 In this embodiment, the compartment 13 with fire will be retained in the box body 1, and the compartment 13 without fire will be pulled out of the box body 1 to prevent it from being spread by the fire. When it is pulled out of the box body 1 sideways, the side door 23 of the box body 1 needs to be opened. This embodiment adopts the following technical solution: the upper part of the side door 23 is rotatably connected to the box body 1, and the side door 23 has rotational freedom. When a fire occurs, the bottom roller of the compartment 13 rolls on the compartment 13 under the pull of the piston rod of the cylinder 15, and the compartment 13 is quickly pulled out of the box body 1. In the process of the compartment 13 being pulled out, it first directly contacts the side door 23, pushes it open and flips it upward, until the compartment 13 is pulled out, and the side door 23 is reset under its own weight.

[0040] In this embodiment, the number of compartment boxes 13 pulled out on any side of the box body 1 may be one or two. Therefore, the stroke of the cylinder 15 in this embodiment and the distance extended after startup are sufficient to pull two groups of compartment boxes 13 directly out of the box body 1, and there is a certain distance between them and the box body 1, which allows the side door 23 to be flipped and reset to the side of the box body 1.

[0041] The side door 23 has rotational freedom, but in working conditions, especially in fire extinguishing conditions, the box body 1 should be in a closed state. A positioning limit protrusion 24 is provided on the pull rod 14. In working conditions, the positioning limit protrusion 24 abuts against the outside of the side door 23 to press the side door 23 to the side of the box body 1.

[0042] The output of the cylinder 15 is also connected with a movable limiting member, which includes a wedge block 25. The wedge block 25 is fixedly connected to the output end of the cylinder 15 through a base 35. The wedge block 25 is movably arranged on the base 35 through a fixedly connected second sliding column 26. A return spring 27 sleeved outside the second sliding column 26 is arranged between the wedge block 25 and the base 35. When the cylinder 15 acts to pull out the partition box 13 by a predetermined distance, the movable limiting member just exposes on the side of the box body 1. At the same time, the side door 23 loses the function of the partition box 13 and flips and resets under its own weight. During the flipping process, it contacts the wedge block 25 of the movable limiting member in advance. Through the action of the inclined plane of the wedge block 25, the downward component force presses the wedge block 25 downward and compresses the return spring 27. When the side door 23 passes over the wedge block 25, it seals the side of the box body 1. At this time, the wedge block 25 is jacked up and reset under the action of the return spring 27 and abuts against the side door 23 to achieve the purpose of limiting it.

[0043] In this embodiment, by endowing the side door 23 with a rotational degree of freedom, the partition box 13 can be smoothly pulled out, and the relatively enclosed state inside the box body 1 is maintained through the positioning limiting convex 24 and the movable positioning member. After a fire breaks out, according to common sense, the power supply also needs to be cut off. In this embodiment, through the action of pulling out the partition box 13, the linkage device cuts off the power.

[0044] Refer to the attached Figure 2 、 Figure 7 Inside the box body 1, there is a power-taking beam 28. On the partition box 13, there is a socket 29 electrically connected to the power-taking beam 28. The socket 29 can slide on the power-taking beam 28 as the partition box 13 moves. The power-taking beam 28 is electrically connected to the power line 30 through an electrical connection head; a protective cover 31 is arranged outside the power line 30. A dialing foot 32 is connected to the protective cover 31. The pull rod 14 is connected with a dialing rod 33. The end of the dialing rod 33 is an inclined plane, and this inclined plane contacts the dialing foot 32.

[0045] After a fire breaks out, the cylinder 15 acts to extend, and the partition box 13 is pulled out of the box body 1 through the pull rod 14. When the pull rod 14 acts, through the extrusion action between the inclined plane at the end of the dialing rod 33 and the dialing foot 32, the electrical connection head between the power line 30 and the power-taking beam 28 is disconnected, completing the power-off operation of the power-taking beam 28. At this time, the electrical components inside the housing 3 are still in the powered-on state to complete subsequent actions.

[0046] As described above, when a fire breaks out, any one of the heat dissipation piston member 8 and the fire extinguishing piston member 9 is actuated by an external force, and the other member is actuated through the state switching member 10 to realize the function of selectively opening the heat dissipation channel and the fire extinguishing agent channel. In this embodiment, the mechanical linkage control is also realized through the extension action of the cylinder 15.

[0047] Specifically, any one of the heat dissipation piston member 8 and the fire extinguishing piston member 9 is connected to the protective cover 31 through a direct connection member 34. When the protective cover 31 is extruded by the dialing foot 32 and pulled out of the electrical connector, the state switching member 10 is rotated through the direct connection member 34 at this time, so that the fire extinguishing pipeline is opened and the heat dissipation pipeline is closed.

[0048] In the present invention, the compartment 13 where a fire occurs is retained in the box body 1 through the box body 1, and fire extinguishing is carried out with a fire extinguishing agent. The compartment 13 where no fire occurs is pulled out of the box body 1 for protection, realizing differential protection of the lithium battery pack; the connection and positioning of the compartment 13 are realized through the tongue assembly, and the dislocation operation when a fire occurs. At the same time of dislocation, the induction member 20 is triggered to emit a fire signal to judge the compartment 13 where a fire occurs; through the action of the cylinder 15, the compartment 13 where no fire occurs is pulled out, and the box body 1 is linked to perform a power-off operation, and the heat dissipation channel and the fire extinguishing channel are linked to perform a state switch. Through the mechanical linkage method, the accuracy and stability of the action are ensured.

[0049] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A safety protection device for a new energy lithium battery, comprising a box body (1) and a box cover (2) rotatably connected thereto, wherein a cover shell (3) is connected to one side of the box body (1), and a space cavity for installing equipment is formed between the cover shell (3) and the box body (1), characterized in that: A fire extinguisher (4) is provided in the space cavity, and the fire extinguisher (4) is connected to the box (1) through a pipeline. A heat dissipation fan (5) is also provided in the space cavity, and the heat dissipation fan (5) is connected to the box (1) through a pipeline. A ventilation hole is provided at the bottom of the box (1); the heat dissipation fan (5) and the fire extinguisher (4) share the same pipeline, and the heat dissipation fan (5) is connected to the pipeline through a heat dissipation branch pipe (6). The fire extinguisher (4) is connected to the pipeline through a fire extinguishing agent branch pipe (7). The heat dissipation branch pipe (6) The fire extinguishing agent branch pipe (7) is respectively provided with a heat dissipation piston member (8) and a fire extinguishing piston member (9) movably built therein, and a state switching member (10) is provided between the heat dissipation piston member (8) and the fire extinguishing piston member (9). The state switching member (10) is provided with slide grooves at both ends, and is connected to a fixed member in the middle through a positioning rod (11). The heat dissipation piston member (8) and the fire extinguishing piston member (9) are both provided with a first slide column (12), and the first slide column (12) is located in the slide groove, and one of the heat dissipation channel and the fire extinguishing agent channel is selectively opened.

2. The safety protection device according to claim 1, characterized in that: The box body (1) has multiple groups of compartments (13) built in, each compartment (13) has a built-in lithium battery pack, and a vent is provided at the bottom; the compartments (13) are connected by a hook and tongue assembly, and the compartments (13) on both sides are connected to the output end of the cylinder (15) by a pull rod (14), the upper part of the side door (23) is rotatably connected to the box body (1), and a roller is provided at the bottom of the compartment (13).

3. The safety protection device according to claim 2, characterized in that: An extension rod (19) is fixedly connected to the outside of the compartment box (13); the extension rod (19) has a fixed length and a cavity inside; The hook tongue assembly comprises a heat conductor (16) connected to the compartment box (13), a deformable sheet (17) connected to the heat conductor (16), the deformable sheet (17) being built into the extension rod (19), the deformable sheets (17) of two adjacent compartment boxes (13) being arranged up and down, the two deformable sheets (17) being connected via a hook tongue (18), the top of the hook tongue (18) passing through the upper extension rod (19) and slidingly cooperating therewith, the part of the hook tongue (18) built into the upper extension rod (19) abutting against the end of the deformable sheet (17), the bottom of the hook tongue (18) extending to the inside of the lower extension rod (19) and abutting against the end of the deformable sheet (17).

4. The safety protection device according to claim 3, characterized in that: The hook tongue (18) is provided with a pressing portion (181), a sensing component (20) is fixed on the extension rod (19), and the pressing portion (181) presses on the sensing component (20).

5. The safety protection device according to claim 4, characterized in that: A balancing spring (21) is provided between the hook tongue (18) and the extension rod (19) for balancing the weight of the hook tongue (18).

6. The safety protection device according to claim 5, characterized in that: A handle bar (22) is also provided on the top of the hook tongue (18).

7. The safety protection device according to claim 4, characterized in that: The heat conductors (16) of the hook tongue assemblies on both sides of the middle compartment box (13) are directly connected via the heat conductor.

8. The safety protection device according to claim 7, characterized in that: The pull rod (14) is provided with a positioning and limiting protrusion (24); The output of the cylinder (15) is also connected to a movable stopper, comprising a wedge block (25). The wedge block (25) is fixedly connected to the output end of the cylinder (15) via a base (35). The wedge block (25) is movably arranged on the base (35) via a fixedly connected second sliding column (26). A return spring (27) sleeved outside the second sliding column (26) is arranged between the wedge block (25) and the base (35).

9. The safety protection device according to claim 2, characterized in that: A power beam (28) is provided in the box body (1), a socket (29) electrically connected to the power beam (28) is provided on the compartment box (13), the socket (29) can slide on the power beam (28), and the power beam (28) is electrically connected to the power line (30) through an electrical connector; a protective cover (31) is provided outside the power line (30), a push pin (32) is connected to the protective cover (31), the pull rod (14) is connected to a push rod (33), and the end of the push rod (33) is an inclined surface, which contacts the push pin (32).

10. The safety protection device according to claim 1, characterized in that: Any one of the heat dissipation piston component (8) and the fire extinguishing piston component (9) is connected to the protective cover (31) via a direct connection component (34).

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