A safety protection device for lithium battery pack

Abstract

The present invention discloses a safety protection device for a lithium battery pack, and relates to a field, including a protective shell and a power-off component, the power-off component including a first split block installed on a top cover, the top of the first split block is fixedly connected to a second split block, the first split block and the second split block are vertically arranged and the bottom ends are both conical, the power-off component is used to push the first split block and the second split block downward after the smoke alarm receives the smoke alarm, thereby pushing multiple groups of batteries in the lithium battery pack to the surroundings through the action of the first split block and the second split block, and after the spacing is expanded, the plug-in blocks are separated from each other and the power is cut off. The present invention can effectively protect the lithium battery pack safely by providing a power-off component, a sealing component and a fire-extinguishing component, and on this basis does not affect the normal heat dissipation of the lithium battery pack, thereby solving the problem that heat dissipation and safety protection cannot be taken into account in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field, and in particular to a safety protection device for a lithium battery pack. Background Art

[0002] Lithium batteries are a type of battery that uses lithium metal or lithium alloy as positive / negative electrode materials and a non-aqueous electrolyte solution. Lithium metal batteries were first proposed and studied in 1912. In the 1970s, lithium-ion batteries were proposed and studied. Due to the very active chemical properties of lithium metal, the processing, storage, and use of lithium metal have very high requirements on the environment. With the development of science and technology, lithium batteries have become mainstream.

[0003] At present, lithium batteries are generally not directly sealed for heat dissipation. In daily life, lithium batteries are often exposed to fire due to the influence of uncertain factors such as high temperature, extrusion, and impact. When the battery catches fire, the existing lithium battery needs to manually take tools and rush to the scene to deal with the fire source. Then, for safety reasons, it is necessary to cut off the power immediately after rushing to the scene, which is cumbersome. The fire cannot be effectively controlled, so the battery continues to catch fire and cannot be effectively protected. After the manual fire extinguishing is completed, the lithium battery is difficult to continue to use, causing great losses, which is not conducive to the protection of lithium batteries. In addition, the location of the heat dissipation port will cause the continuous input of external oxygen, increasing the internal fire. How to balance heat dissipation and safety is an important issue in the research of battery boxes. To this end, we propose a safety protection device for lithium battery packs. Summary of the invention

[0004] The object of the present invention is to provide a safety protection device for a lithium battery pack to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a safety protection device for a lithium battery pack, comprising a protective shell, a power-off component, a sealing component and a fire-extinguishing component, the protective shell being provided with heat dissipation holes, a top cover being installed on the top of the protective shell, a smoke alarm being installed on the top cover, and a lithium battery pack being installed in the protective shell, a plug-in block being provided on the lithium battery pack for connecting the positive and negative electrodes of the lithium battery in series, and a wire being connected to the plug-in block, the end of the wire being connected to a socket extending to the outside of the protective shell, and an extrusion block being installed at the corner of the lithium battery pack, the power-off component comprising a first split block installed on the top cover, a second split block being fixedly connected to the top of the first split block The first split block and the second split block are vertically arranged and have conical bottom ends. The power-off component is used to push the first split block and the second split block downward after the smoke alarm receives the smoke alarm, so that the multiple groups of batteries in the lithium battery pack are pushed to the surroundings through the action of the first split block and the second split block, and the plug-in blocks are disconnected from each other and powered off after the spacing is enlarged. The sealing component is installed inside the protective shell. The sealing component is used to seal the heat dissipation hole after the lithium battery pack is powered off, so that a sealed space is generated inside the protective shell. The fire extinguishing component is installed on the top cover, and the fire extinguishing component is used to spray carbon dioxide into the protective shell to extinguish the fire after the protective shell is sealed.

[0006] Preferably, the power-off assembly includes a connecting block fixed to the top of the first split block and the second split block, the top of the connecting block is fixedly connected to a threaded sleeve, the outer side of the threaded sleeve is slidably connected to a limiting sleeve, the limiting sleeve is fixedly connected to a fixing rod fixedly connected to the top cover, and the threaded sleeve is internally threadedly connected to a threaded rod rotatably connected to the top cover, the top of the threaded rod is fixedly connected to a turning handle, and a moving part for driving the extrusion block to move is also installed on the connecting block.

[0007] Preferably, the movable part includes a connecting column fixedly connected to the connecting block, the connecting column is provided with four groups and are symmetrically installed at the corners of the connecting block, and the connecting column is rotatably connected to a rotating rod, the end of the rotating rod is rotatably connected to a fixed sleeve, the fixed sleeve is rotatably connected to a connecting rod, the two ends of the two groups of connecting rods are respectively fixedly connected to the four groups of extrusion blocks, and the rotating rod is fixedly connected to a rotating shaft rotatably connected to the top cover.

[0008] Preferably, the fire extinguishing assembly includes a carbon dioxide fire extinguisher fixedly connected to the top cover, the carbon dioxide fire extinguisher is provided with an air outlet, and a sealing block is installed on the carbon dioxide fire extinguisher at the position of the air outlet, the sealing block is rotatably connected to the carbon dioxide fire extinguisher, and the sealing block is provided with an exhaust hole adapted to the air outlet, and the sealing block is connected to a rotating part for driving the sealing block to rotate.

[0009] Preferably, the rotating member comprises a worm fixedly connected to the rotating shaft, the outer side of the worm is drivingly connected to a turbine, and the axis of the turbine is fixedly connected to a connecting shaft fixedly connected to the sealing block.

[0010] Preferably, the sealing assembly comprises a movable sheet installed on one side of the heat dissipation hole, one end of the movable sheet is fixedly connected to a sealing strip for sealing the heat dissipation hole, and the movable sheet is connected to an elastic member.

[0011] Preferably, the elastic member includes fixed plates fixed at both ends of the movable plate, the fixed plate is slidably connected with a fixed column fixedly connected to the protective shell, a spring is installed on the outer side of the fixed column, and both ends of the spring are respectively fixedly connected to the protective shell and the fixed plate.

[0012] Preferably, the outer side surface of the turning handle is provided with anti-slip grooves to increase the friction during rotation, thereby facilitating the rotation of the turning handle.

[0013] Preferably, the air outlet holes and the exhaust holes are provided in a plurality of corresponding groups, so as to facilitate the rapid ejection of carbon dioxide, thereby facilitating rapid fire extinguishing.

[0014] Preferably, the bottom end of the extrusion block is tapered, which is beneficial for the extrusion block to extrude the lithium battery pack.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The present invention provides a safety protection device for a lithium battery pack. When the lithium battery pack catches fire, a power-off component, a sealing component and a fire-extinguishing component are provided. Therefore, when the lithium battery pack catches fire, multiple groups of batteries in the lithium battery pack can be quickly separated by the action of the power-off component to avoid the spread of fire and prevent the unburned lithium batteries from catching fire. Then the heat dissipation holes are blocked and carbon dioxide is sprayed to extinguish the fire. The device is easy to operate, avoids large-scale damage to lithium batteries, and effectively reduces the cost of fire. At the same time, it can greatly dissipate heat through the heat dissipation groove in normal operating state to improve the heat dissipation efficiency. Therefore, the power-off component, sealing component and fire-extinguishing component provided can effectively protect the lithium battery pack safely without affecting the normal heat dissipation of the lithium battery pack. Therefore, the problem that heat dissipation and safety protection cannot be taken into account in the prior art is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 This is a schematic diagram of the top cover split structure of the present invention;

[0019] Figure 3 For the present invention Figure 2 Another perspective structural diagram;

[0020] Figure 4 This is a schematic diagram of the connection structure between the lithium battery pack, the protective shell and the sealing assembly of the present invention;

[0021] Figure 5 This is a schematic diagram of the structure of the power-off component of the present invention;

[0022] Figure 6 For the present invention Figure 5 Schematic diagram of the structure of the middle A area;

[0023] Figure 7 It is a schematic diagram of the structure of the moving part of the present invention;

[0024] Figure 8 It is a schematic diagram of the structure of the fire extinguishing assembly of the present invention;

[0025] Fig. 9 This is a schematic diagram of the connection structure between the sealing assembly and the protective shell of the present invention;

[0026] Fig.10 For the present invention Fig. 9 Schematic diagram of the structure of area B.

[0027] In the figure: 1-protective shell; 2-heat dissipation hole; 3-top cover; 4-lithium battery pack; 5-plug block; 6-wire; 7-socket; 8-extrusion block; 9-power off assembly; 10-first split block; 11-second split block; 12-fire extinguishing assembly; 13-sealing assembly; 14-smoke alarm; 15-connecting block; 16-threaded sleeve; 17-limiting sleeve; 18-fixed rod; 19-threaded rod; 20-turn handle; 21-connecting column; 22-rotating rod; 23-fixed sleeve; 24-rotating shaft; 25-connecting rod; 26-carbon dioxide fire extinguisher; 27-air outlet; 28-sealing block; 29-exhaust hole; 30-rotating part; 31-worm; 32-turbine; 33-connecting shaft; 34-movable sheet; 35-sealing strip; 36-elastic part; 37-fixed sheet; 38-fixed column; 39-spring; 40-moving part. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] See also Figure 1-Figure 10 The present invention provides a technical solution: a safety protection device for a lithium battery pack, comprising a protective shell 1, a power-off component 9, a sealing component 13 and a fire-extinguishing component 12, wherein the protective shell 1 is provided with a heat dissipation hole 2, a top cover 3 is installed on the top of the protective shell 1, a smoke alarm 14 is installed on the top cover 3, and a lithium battery pack 4 is installed in the protective shell 1, a plug-in block 5 for connecting the positive and negative electrodes of the lithium battery in series is provided on the lithium battery pack 4, and a wire 6 is connected to the plug-in block 5, and the end of the wire 6 is connected to a socket 7 extending to the outside of the protective shell 1, and an extrusion block 8 is installed at the corner of the lithium battery pack 4, the power-off component 9 includes a first split block 10 installed on the top cover 3, and the top of the first split block 10 is fixedly connected to a second split block 11, The first split block 10 and the second split block 11 are arranged vertically and the bottom ends are both conical. The power-off component 9 is used to push the first split block 10 and the second split block 11 downward after the smoke alarm 14 receives the smoke alarm, so that the multiple groups of batteries in the lithium battery pack 4 are pushed to the surroundings through the action of the first split block 10 and the second split block 11, and the plug-in blocks 5 are disconnected from each other and powered off after the spacing is expanded. The sealing component 13 is installed inside the protective shell 1. The sealing component 13 is used to seal the heat dissipation hole 2 after the lithium battery pack 4 is powered off, so that a sealed space is generated inside the protective shell 1. The fire extinguishing component 12 is installed on the top cover 3, and the fire extinguishing component 12 is used to spray carbon dioxide into the protective shell 1 to extinguish the fire after the protective shell 1 is sealed.

[0030] In this solution, when the lithium battery pack 4 catches fire, the smoke alarm 14 will sound an alarm. At this time, the power-off component 9 is started to move the first split block 10 and the second split block 11 downward. The downward movement of the first split block 10 and the second split block 11 makes the multiple groups of lithium batteries in the lithium battery pack 4 dispersed, and then the connected plug-in blocks 5 are separated, which has the effect of cutting off the power. In this process, the fire extinguishing component 12 and the sealing component 13 are started synchronously, and the protective shell 1 is sealed by the action of the sealing component 13, and then the fire extinguishing component 12 sprays carbon dioxide to extinguish the lithium battery, thereby avoiding large-scale damage to the lithium battery and effectively reducing the cost of the fire. At the same time, it can dissipate a lot of heat through the heat dissipation groove in normal operating state to improve the heat dissipation efficiency. Therefore, the power-off component 9, the sealing component 13 and the fire extinguishing component 12 can effectively protect the lithium battery pack 4 safely without affecting the normal heat dissipation of the lithium battery pack 4 on this basis.

[0031] The power-off assembly 9 includes a connecting block 15 fixed to the top of the first split block 10 and the second split block 11, the top of the connecting block 15 is fixedly connected to a threaded sleeve 16, the outer side of the threaded sleeve 16 is slidably connected to a limiting sleeve 17, the limiting sleeve 17 is fixedly connected to a fixing rod 18 fixedly connected to the top cover 3, and the threaded sleeve 16 is internally threadedly connected to a threaded rod 19 rotatably connected to the top cover 3, the top of the threaded rod 19 is fixedly connected to a turning handle 20, and the connecting block 15 is also equipped with a handle for driving the extrusion block 8 to move. The movable member 40 includes a connecting column 21 fixedly connected to the connecting block 15, and the connecting column 21 is provided with four groups and symmetrically installed at the corners of the connecting block 15, and the connecting column 21 is rotatably connected to a rotating rod 22, and the end of the rotating rod 22 is rotatably connected to a fixed sleeve 23, and the fixed sleeve 23 is rotatably connected to a connecting rod 25, and the two ends of the two groups of connecting rods 25 are fixedly connected to the four groups of extrusion blocks 8, respectively, and the rotating rod 22 is fixedly connected to a rotating shaft 24 rotatably connected to the top cover 3.

[0032] In the present solution, by rotating the turning handle 20, the turning handle 20 will drive the threaded rod 19 to rotate, and the rotation of the threaded rod 19 will cause the threaded sleeve 16 to move downward, and then the downward movement of the threaded sleeve 16 will cause the connecting block 15 to drive the first split block 10 and the second split block 11 to move downward. Since the bottom ends of the first split block 10 and the second split block 11 are conical, the downward movement of the first split block 10 and the second split block 11 will cause the multiple groups of lithium batteries in the lithium battery pack 4 to be dispersed, thereby achieving a power-off effect. In addition, after the multiple groups of lithium batteries are dispersed, the spread of fire can be effectively avoided, thereby protecting the batteries that have not caught fire from being damaged by the spread of fire.

[0033] In this solution, as the connecting block 15 moves downward, the connecting column 21 fixedly connected to the connecting block 15 will move downward, and the downward movement of the connecting column 21 will cause the rotating rod 22 to rotate, and the rotation of the rotating rod 22 will cause the fixing sleeve 23 to drive the connecting rod 25 to move upward, thereby causing the extrusion block 8 to move upward, thereby causing the extrusion block 8 to move away from the lithium battery pack 4, thereby ensuring that the individual batteries in the lithium battery pack 4 have enough space to disperse.

[0034] The fire extinguishing assembly 12 includes a carbon dioxide fire extinguisher 26 fixedly connected to the top cover 3, an air outlet 27 is provided on the carbon dioxide fire extinguisher 26, and a sealing block 28 is installed on the carbon dioxide fire extinguisher 26 at the position of the air outlet 27, the sealing block 28 is rotatably connected to the carbon dioxide fire extinguisher 26, and an exhaust hole 29 adapted to the air outlet 27 is provided on the sealing block 28, and a rotating member 30 for driving the sealing block 28 to rotate is connected to the sealing block 28, the rotating member 30 includes a worm 31 fixedly connected to the rotating shaft 24, the outer side of the worm 31 is transmission-connected to a turbine 32, and the axis of the turbine 32 is fixedly connected to a connecting shaft 33 fixedly connected to the sealing block 28.

[0035] In this solution, the rotating shaft 24 will be driven to rotate during the rotation of the rotating rod 22, so the worm 31 will be rotated by the rotation of the rotating shaft 24, and then the turbine 32 will be rotated by the rotation of the worm 31, thereby driving the connecting shaft 33 to rotate, and the sealing block 28 will be rotated by the rotation of the connecting shaft 33. After the sealing block 28 rotates, the air outlet 27 and the exhaust hole 29 correspond to each other. At this time, the carbon dioxide in the carbon dioxide fire extinguisher 26 is discharged through the exhaust hole 29 and the air outlet 27 to extinguish the fire of the lithium battery pack 4.

[0036] The sealing assembly 13 includes a movable sheet 34 installed on one side of the heat dissipation hole 2, one end of the movable sheet 34 is fixedly connected to a sealing strip 35 for sealing the heat dissipation hole 2, and the movable sheet 34 is connected to an elastic member 36, and the elastic member 36 includes a fixed sheet 37 fixed to both ends of the movable sheet 34, and a fixed column 38 fixedly connected to the protective shell 1 is slidably connected to the fixed sheet 37, and a spring 39 is installed on the outer side of the fixed column 38, and the two ends of the spring 39 are respectively fixedly connected to the protective shell 1 and the fixed sheet 37.

[0037] In this solution, during the dispersion of the lithium battery pack 4, the movable sheet 34 will be squeezed to move the movable sheet 34, so the movable sheet 34 will drive the sealing strip 35 to move, and the heat dissipation hole 2 will be sealed by the sealing strip 35, thereby ensuring that a relatively sealed environment is generated inside the protective shell 1 and the top cover 3 to prevent oxygen from entering.

[0038] In this solution, during normal use, the spring 39 acts to move the fixed sheet 37 away from the movable sheet 34 to keep away from the heat dissipation hole 2, thereby keeping the sealing strip 35 away from the heat dissipation hole 2, thereby ensuring normal heat dissipation of the lithium battery during normal use.

[0039] In the present embodiment, the outer side surface of the tumbler 20 is provided with anti-slip grooves to increase the friction during rotation, thereby facilitating the rotation of the tumbler 20. A plurality of corresponding groups of air outlet holes 27 and exhaust holes 29 are provided to facilitate the rapid ejection of carbon dioxide, thereby facilitating rapid fire extinguishing. The bottom end of the extrusion block 8 is tapered, which is conducive to the extrusion of the lithium battery pack 4 by the extrusion block 8.

[0040] Working principle: when the lithium battery pack 4 catches fire, the smoke alarm 14 will sound an alarm, and then the handle 20 will be turned, which will drive the threaded rod 19 to rotate. The threaded sleeve 16 will move downward through the rotation of the threaded rod 19, and then the connection block 15 will drive the first split block 10 and the second split block 11 to move downward through the downward movement of the threaded sleeve 16. Since the bottom ends of the first split block 10 and the second split block 11 are conical, the downward movement of the first split block 10 and the second split block 11 will disperse the multiple groups of lithium batteries in the lithium battery pack 4, thereby achieving a power-off effect. In addition, after the multiple groups of lithium batteries are dispersed, the spread of fire can be effectively avoided, thereby protecting the batteries that have not caught fire from being damaged by the spread of fire. It is worth noting that in the process of the connection block 15 moving downward, the connection column 21 fixedly connected to the connection block 15 will move downward, and the downward movement of the connection column 21 will cause the rotating rod 22 to rotate. The rotation of the rotating rod 22 will cause the fixed sleeve 23 to drive the connecting rod 25 to move upward, thereby making The extrusion block 8 is moved upward, so that the extrusion block 8 is away from the lithium battery pack 4, thereby ensuring that the individual batteries in the lithium battery pack 4 have enough space to disperse. In this process, the rotating shaft 24 will be driven to rotate during the rotation of the rotating rod 22. Therefore, the worm 31 is rotated by the rotation of the rotating shaft 24, and then the turbine 32 is rotated by the rotation of the worm 31, thereby driving the connecting shaft 33 to rotate, and the sealing block 28 is rotated by the rotation of the connecting shaft 33. After the sealing block 28 rotates, the air outlet 27 and the exhaust hole 29 correspond to each other. At this time, the carbon dioxide in the carbon dioxide fire extinguisher 26 is discharged through the exhaust hole 29 and the air outlet 27 to extinguish the lithium battery pack 4, and in the process of the lithium battery pack 4 being dispersed, the movable sheet 34 will be squeezed to move the movable sheet 34, so the movable sheet 34 will drive the sealing strip 35 to move, and the heat dissipation hole 2 is sealed by the action of the sealing strip 35, thereby ensuring that a relatively sealed environment is generated inside the protective shell 1 and the top cover 3 to prevent oxygen from entering.

[0041] In this solution, during normal use, the spring 39 acts to move the fixed sheet 37 away from the movable sheet 34 to keep away from the heat dissipation hole 2, thereby keeping the sealing strip 35 away from the heat dissipation hole 2, thereby ensuring normal heat dissipation of the lithium battery during normal use.

[0042] It is particularly noted that the turning handle 20 in this solution is not detachably connected to the threaded rod 19. The turning handle 20 can be replaced with a motor after being disassembled. When a fire occurs, the fire can be automatically controlled by automatically starting the motor.

[0043] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0044] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A safety protection device for a lithium battery pack, comprising: A protective shell (1), the protective shell (1) being provided with heat dissipation holes (2), a top cover (3) being installed at the top of the protective shell (1), a smoke alarm (14) being installed on the top cover (3), a lithium battery pack (4) being installed in the protective shell (1), a plug-in block (5) being provided on the lithium battery pack (4) for connecting the positive and negative electrodes of the lithium batteries in series, a wire (6) being connected to the plug-in block (5), the end of the wire (6) being connected to a socket (7) extending to the outside of the protective shell (1), and an extrusion block (8) being installed at the corner of the lithium battery pack (4); It is characterized by further comprising: A power-off component (9), the power-off component (9) comprising a first split block (10) mounted on the top cover (3), the top of the first split block (10) being fixedly connected to a second split block (11), the first split block (10) and the second split block (11) being arranged vertically and having conical bottoms, the power-off component (9) being used to push the first split block (10) and the second split block (11) downward after the smoke alarm (14) receives a smoke alarm, thereby pushing the plurality of battery groups in the lithium battery pack (4) toward the surroundings through the action of the first split block (10) and the second split block (11), and expanding the spacing so that the plug-in blocks (5) are disconnected from each other and the power is cut off; A sealing component (13), the sealing component (13) being installed inside the protective shell (1), the sealing component (13) being used to seal the heat dissipation hole (2) after the lithium battery pack (4) is powered off, so that a sealed space is generated inside the protective shell (1); a fire extinguishing assembly (12), the fire extinguishing assembly (12) being mounted on the top cover (3), and the fire extinguishing assembly (12) being used to spray carbon dioxide into the interior of the protective shell (1) to extinguish a fire after the protective shell (1) is sealed; The power-off assembly (9) comprises a connecting block (15) fixed to the top ends of the first split block (10) and the second split block (11); the top end of the connecting block (15) is fixedly connected to a threaded sleeve (16); the outer side surface of the threaded sleeve (16) is slidably connected to a limiting sleeve (17); the limiting sleeve (17) is fixedly connected to a fixing rod (18) fixedly connected to the top cover (3); the threaded sleeve (16) is internally threadedly connected to a threaded rod (19) rotatably connected to the top cover (3); the top end of the threaded rod (19) is fixedly connected to a turning handle (20); and a moving member (40) for driving the extrusion block (8) to move is also mounted on the connecting block (15); The moving member (40) comprises a connecting column (21) fixedly connected to the connecting block (15), the connecting column (21) being provided with four groups and symmetrically mounted at the corners of the connecting block (15), and a rotating rod (22) being rotatably connected to the connecting column (21), the end of the rotating rod (22) being rotatably connected to a fixing sleeve (23), the fixing sleeve (23) being rotatably connected to a connecting rod (25), the two ends of the two groups of connecting rods (25) being fixedly connected to the four groups of extrusion blocks (8), and the rotating rod (22) being fixedly connected to a rotating shaft (24) rotatably connected to the top cover (3); The fire extinguishing assembly (12) comprises a carbon dioxide fire extinguisher (26) fixedly connected to the top cover (3), the carbon dioxide fire extinguisher (26) being provided with an air outlet hole (27), and a sealing block (28) being installed on the carbon dioxide fire extinguisher (26) at the position of the air outlet hole (27), the sealing block (28) being rotatably connected to the carbon dioxide fire extinguisher (26), the sealing block (28) being provided with an exhaust hole (29) matched with the air outlet hole (27), and the sealing block (28) being connected to a rotating member (30) for driving the sealing block (28) to rotate.

2. A safety protection device for a lithium battery pack according to claim 1, characterized in that: The rotating member (30) comprises a worm (31) fixedly connected to the rotating shaft (24); the outer side of the worm (31) is drivingly connected to a turbine (32); the axis of the turbine (32) is fixedly connected to a connecting shaft (33) fixedly connected to the sealing block (28).

3. A safety protection device for a lithium battery pack according to claim 2, characterized in that: The sealing assembly (13) comprises a movable sheet (34) mounted on one side of the heat dissipation hole (2), one end of the movable sheet (34) being fixedly connected to a sealing strip (35) for sealing the heat dissipation hole (2), and the movable sheet (34) being connected to an elastic member (36).

4. A safety protection device for a lithium battery pack according to claim 3, characterized in that: The elastic member (36) comprises fixed plates (37) fixed to both ends of the movable plate (34); a fixed column (38) fixedly connected to the protective shell (1) is slidably connected to the fixed plate (37); a spring (39) is mounted on the outer side of the fixed column (38); and both ends of the spring (39) are fixedly connected to the protective shell (1) and the fixed plate (37), respectively.

5. A safety protection device for a lithium battery pack according to claim 4, characterized in that: The outer side surface of the turning handle (20) is provided with anti-slip patterns.

6. A safety protection device for a lithium battery pack according to claim 5, characterized in that: The air outlet holes (27) and the exhaust holes (29) are provided in multiple groups correspondingly.

7. A safety protection device for a lithium battery pack according to claim 6, characterized in that: The bottom end of the extrusion block (8) is conical.

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