Lithium battery protection device and protection method

Abstract

The present invention relates to the field of lithium battery safety technology, and discloses a lithium battery protection device and protection method, wherein a lithium battery protection device includes a lithium battery shell and a protective frame outside the lithium battery shell, the protective frame including a guard plate, a side connecting rod and an end angle connecting frame, the lithium battery shell is a cube, and the six sides of the lithium battery shell are all installed with guard plates, and a side connecting rod is installed on one side of the guard plate, and the side connecting rod is used to connect two adjacent guard plates, and the two ends of the side connecting rod are at right angles. The interior of the isolation chamber of the present invention has a certain sealing effect, which can enable carbon dioxide to be located therein to achieve efficient fire extinguishing in the lithium battery shell, thereby increasing the safety level and fire extinguishing efficiency of the device, and can be used simultaneously with the expansion and contraction protection effect provided by the lithium battery shell and the protective frame. The two can be combined to enable the device to have external protection and internal fire processing functions, further increasing the protection effect of the device.

Description

Technical Field

[0001] The present invention relates to the field of lithium battery safety technology, and in particular to a lithium battery protection device and a protection method. Background Art

[0002] Lithium batteries can be broadly divided into two categories: lithium metal batteries and lithium-ion batteries. Lithium-ion batteries do not contain metallic lithium and are rechargeable. The fifth generation of rechargeable batteries, lithium metal batteries, was introduced in 1996. They offer superior safety, specific capacity, self-discharge rate, and cost-performance compared to lithium-ion batteries. However, due to their high technical requirements, only a few companies in various countries manufacture these batteries.

[0003] Publication number CN214124007U discloses a lithium battery fire protection frame, comprising a base, wherein the upper surface of the base is fixed with multiple shells by bolts, the two sides of the shells are rotatably connected with rotating columns, one side of the rotating columns is wrapped with fireproof cloth, a first slide and a second slide are welded between the shells, one side of the first slide and the second slide are slidably connected with a slider, the slider is fixedly connected to the fireproof cloth, and one side of the slider is fixed with a first spring by bolts, one end of the first spring is fixedly connected to the shell, one side of the shell is provided with a groove, one side of the groove is clamped with a card block, and the card block is fixedly connected to the slider. The advantage of the present invention is that it can protect lithium batteries, avoid collisions with lithium batteries, and cause damage to the lithium batteries, thereby improving the practicality of the device, and solving the problem of not only preventing lithium batteries from being damaged, but also being able to perform fireproofing on lithium batteries, thereby improving the flexibility of the device.

[0004] However, there is a lack of a structure to protect the sides of the lithium battery, and the protection effect is not significant enough. If a fire occurs inside the lithium battery, it cannot be handled. Therefore, it does not meet the existing needs. We have proposed a lithium battery protection device and protection method. Summary of the Invention

[0005] The present invention provides a lithium battery protection device and protection method, which has the beneficial effect of no-dead-angle protection, and solves the problem mentioned in the above background technology that there is a lack of structure for side protection of lithium batteries, the protection effect is not significant enough, and if a fire occurs inside the lithium battery, it cannot be handled.

[0006] The present invention provides the following technical solutions: a lithium battery protection device and a protection method, wherein a lithium battery protection device includes a lithium battery shell and a protection frame outside the lithium battery shell, the protection frame includes a guard plate, side connecting rods and end corner connecting frames, the lithium battery shell is a cube, and the six sides of the lithium battery shell are installed with guard plates, and a side connecting rod is installed on one side of the guard plate, and the side connecting rod is used to connect two adjacent guard plates;

[0007] The two ends of the side connecting rods are at right angles and are in telescopic connection with one end of each guard plate;

[0008] The four end corners of each guard plate are equipped with end corner connecting frames, which are used to connect the end corners of the three guard plates to each other in a sliding connection state;

[0009] Between each two guard plates, a volume expansion function is provided through a telescopic connection with the side connecting rods.

[0010] The present invention also provides a lithium battery protection device and protection method, wherein each of the two sides of the guard plate is installed with a driving protection component, the driving protection component includes a first conveying groove and a pressure chamber, and the pressure chamber is provided on both sides of the guard plate. The side connecting rod is used to slide in the pressure chamber, and the inside of the side connecting rod is provided with a first conveying groove.

[0011] The present invention also provides a lithium battery protection device and protection method, wherein each end corner of the lithium battery shell is installed with an end corner connecting component, the end corner connecting component includes an internal end corner and a telescopic rod, and the outer side of the internal end corner is installed with a telescopic rod, and the telescopic rod is used to support the movable changes between the end corner connecting frame and the lithium battery shell.

[0012] After the guard plate is expanded, a cavity is provided between the guard plate and the lithium battery shell, and the cavity is an isolation cavity.

[0013] The present invention also provides a lithium battery protection device and protection method, wherein the end angle connection component further includes a limiting shaft and a slide groove, the four end angles of the guard plate are provided with a slide groove, and the three inner surfaces of the end angle connection frame are provided with a limiting shaft;

[0014] The limiting shaft is used to extend inside the slide groove, and the limiting shaft and the slide groove are used to ensure the sliding connection between the guard plate and the end angle connecting frame.

[0015] The present invention also provides a lithium battery protection device and protection method, wherein an expansion and contraction component is provided inside the protective plate, and the expansion and contraction component includes a first piston end and a through groove, one end of the end angle connecting frame is provided with the first piston end, and one end of the connecting hose is provided with a through groove located inside the first piston end.

[0016] The present invention also provides a lithium battery protection device and protection method, wherein a pressure-assisting plate is provided at one end of the inner wall of the pressure chamber, and a second piston end is provided at one end of the pressure-assisting plate;

[0017] One end of the pressure assist plate is used to extend to the inside of the connecting hose, and the second piston end is used to seal the inside of the through groove. A high-pressure tank is installed on the side of each guard plate, and the interior of the high-pressure tank is filled with carbon dioxide gas.

[0018] The present invention also provides a lithium battery protection device and protection method, wherein the expansion and contraction component further includes a matching notch and a second conveying groove, a matching notch is further provided on one side of the first piston end, and the second conveying groove is symmetrically provided inside the guard plate;

[0019] One end of the matching slot is used to communicate with the second conveying slot.

[0020] The present invention also provides a lithium battery protection device and protection method. The interior of the protective plate has four extension grooves in a circular array. The outer surface of the extension groove is provided with an exhaust port located outside the protective plate. One end of the extension groove is used to connect with the second conveying trough.

[0021] The present invention also provides a lithium battery protection device and protection method, wherein the driving protection component further includes a solenoid valve and a connecting hose, and the solenoid valve is installed on one side of the high-pressure tank;

[0022] A connecting hose is installed at one end of the solenoid valve, and one end of the connecting hose is communicated with the first conveying groove.

[0023] The present invention also provides a lithium battery protection device and protection method.

[0024] S1. Drive: The high-pressure tank provides carbon dioxide to the device and provides high-pressure driving power. The high-pressure gas is delivered to the interior of the first delivery trough through the connecting hose. The first delivery trough then delivers the high-pressure gas to the interior of the pressure chamber.

[0025] S2. Expansion and contraction of the guard plates and the side connecting rods: Through the conveying effect of the first conveying trough and the connecting hose, the interior of the high-pressure tank is connected to the pressure chamber. If the pressure inside the high-pressure tank is greater than that in the pressure chamber, the pressure inside the high-pressure tank will quickly enter the pressure chamber and push the first piston end outward. The first piston end and the side connecting rod are an integrated structure. When the first piston end is pushed out, the two guard plates are vertically separated and the side connecting rods are extended and retracted.

[0026] S3, protective isolation: The protective plate has six sides distributed on the outside of the lithium battery shell. When the protective frame expands as a whole, it will drive the limit shaft to slide inside the slide groove, providing a limiting effect while sliding. After the protective frame expands, it can increase the volume inside the device, forming an isolation cavity between the lithium battery shell and the protective frame shell, changing the contact method between the two and isolating them.

[0027] S4. Fire extinguishing measures: When the interior is subjected to high pressure, the side connecting rod is linked to move outward through the first piston end. After the side connecting rod moves to the current position of the second conveying groove, one end of the matching groove will be connected to the second conveying groove, so that the pressure is transported from the second conveying groove to the inside of the extension groove, and then the extension groove transports the pressure to the outside and into the cavity of the isolation chamber to perform fire extinguishing operations.

[0028] The present invention has the following beneficial effects:

[0029] 1. The lithium battery protection device, through the cooperation of the guard plate and the side connecting rod, utilizes the high pressure state of the high-pressure tank itself to increase the pressure inside the pressure chamber, and through the sealing of the first piston end, the pressure acts on the first piston end and drives the first piston end to exit the pressure chamber. The first piston end and the side connecting rod are an integral structure, and drive the side connecting rod to move together, while moving, the end angle connecting frame is pulled to move synchronously, and the internal space provided by the protection frame is increased to form an isolation chamber, which isolates the lithium battery shell from the protection frame to prevent the safe use of the lithium battery from being affected by adverse external conditions. The guard plate, the side connecting rod and the end angle connecting frame are in a state of mutual adhesion and have a certain sealing effect, so it can also prevent the internal fire from spreading outward, so that the device has the function of protecting the internal lithium battery and isolating from external conditions. The device is a six-sided square protective shell that can provide all-round protection for the battery.

[0030] 2. The lithium battery protection device transports the carbon dioxide inside the high-pressure tank into the area of the isolation chamber through the extension groove and the exhaust port, so that the carbon dioxide is filled therein. This not only provides the device with an isolation effect, but also achieves a carbon dioxide fire extinguishing effect. The isolation chamber has a certain sealing effect, so that when the carbon dioxide is located therein, it can effectively extinguish the fire inside the lithium battery shell, thereby increasing the safety and fire extinguishing efficiency of the device. In addition, the device can be used simultaneously with the expansion and contraction protection effect provided by the lithium battery shell and the protective frame. The two can be combined to provide the device with external protection and internal fire handling functions, further enhancing the protection effect of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic structural diagram of the present invention as a whole.

[0032] Figure 2 This is a schematic diagram of the structure of the driving protection component of the present invention.

[0033] Figure 3 This is a schematic structural diagram of the end angle connection component of the present invention.

[0034] Figure 4 For the present invention Figure 3 A is a schematic diagram of the local structure.

[0035] Figure 5 Schematic diagram of the internal structure of the guard plate of the present invention.

[0036] Figure 6 For the present invention Figure 5 The B points are schematic diagrams of the local structure.

[0037] Figure 7 It is a schematic diagram of the internal cross-sectional structure of the guard plate of the present invention.

[0038] In the figure: 1. Lithium battery shell; 2. Protection frame; 21. Guard plate; 22. Side connecting rod; 23. End angle connecting frame; 3. Drive protection component; 31. High-pressure tank; 32. Solenoid valve; 33. Connecting hose; 34. First conveying trough; 35. Pressure chamber; 4. End angle connecting component; 41. Internal end angle; 42. Telescopic rod; 43. Limiting shaft; 44. Slide; 5. Expansion and contraction component; 51. First piston end; 52. Through groove; 53. Matching notch; 54. Second conveying trough; 55. Pressure assist plate; 56. Second piston end; 57. Extension groove; 58. Exhaust port; 6. Isolation chamber. DETAILED DESCRIPTION

[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0040] Example 1

[0041] See also Figure 1-7 , and discloses a lithium battery protection device, including a lithium battery shell body 1 and a protective frame 2 outside the lithium battery shell body 1, the protective frame 2 includes a protective plate 21, a side connecting rod 22 and an end corner connecting frame 23, the lithium battery shell body 1 is a cube, and the six sides of the lithium battery shell body 1 are installed with a protective plate 21, and a side connecting rod 22 is installed on one side of the protective plate 21, and the side connecting rod 22 is used to connect two adjacent protective plates 21;

[0042] The two ends of the side connecting rod 22 are at right angles and are in telescopic connection with one end of each guard plate 21;

[0043] Each guard plate 21 is provided with an end corner connecting frame 23 at its four end corners. The end corner connecting frame 23 is used to connect the end corners of the three guard plates 21 to each other in a sliding connection state.

[0044] Between each two guard plates 21, a volume expansion function is provided through a telescopic connection with the side connecting rod 22;

[0045] Each side of each guard plate 21 is equipped with a driving guard component 3, which includes a first conveying groove 34 and a pressure chamber 35. The pressure chamber 35 is provided on both sides of the guard plate 21. The side connecting rod 22 is used to slide in the pressure chamber 35. The first conveying groove 34 is provided inside the side connecting rod 22.

[0046] Each end corner of the lithium battery shell 1 is equipped with an end corner connecting component 4, which includes an internal end corner 41 and a telescopic rod 42. The telescopic rod 42 is installed on the outer side of the internal end corner 41. The telescopic rod 42 is used to support the movable changes between the end corner connecting frame 23 and the lithium battery shell 1.

[0047] After the guard plate 21 is expanded, a cavity is provided between the guard plate 21 and the lithium battery shell 1, and the cavity is the isolation cavity 6;

[0048] The end corner connection component 4 further includes a limiting shaft 43 and a slide groove 44. The four end corners of the guard plate 21 are provided with a slide groove 44, and the three inner surfaces of the end corner connection frame 23 are provided with a limiting shaft 43.

[0049] The limiting shaft 43 is used to extend inside the slide groove 44. The limiting shaft 43 and the slide groove 44 are used to ensure the sliding connection between the guard plate 21 and the end angle connecting frame 23;

[0050] An expansion and contraction component 5 is provided inside the guard plate 21. The expansion and contraction component 5 includes a first piston end 51 and a through slot 52. One end of the end angle connecting frame 23 is provided with the first piston end 51. One end of the connecting hose 33 is provided with a through slot 52 located in the first piston end 51.

[0051] A pressure-assisting plate 55 is provided at one end of the inner wall of the pressure chamber 35 , and a second piston end 56 is provided at one end of the pressure-assisting plate 55 ;

[0052] One end of the pressure assist plate 55 is used to extend to the inside of the connecting hose 33, and the second piston end 56 is used to seal the inside of the through groove 52. A high-pressure tank 31 is installed on the side of each guard plate 21, and the interior of the high-pressure tank 31 is filled with carbon dioxide gas.

[0053] Before use, connect the solenoid valve 32 to the safety component of the device being used. When the safety is disconnected, the solenoid valve 32 is de-energized and released, allowing the high-pressure carbon dioxide gas inside the high-pressure tank 31 to be transported to the inside of the first delivery trough 34 through the connecting hose 33. The first delivery trough 34 then delivers the gas to the inside of the pressure chamber 35.

[0054] The expansion driving force of the guard plate 21 and the side connecting rod 22: through the conveying effect of the connecting hose 33 and the first conveying groove 34, the high-pressure tank 31 and the pressure chamber 35 are connected. The interior of the high-pressure tank 31 is in a high-pressure state, so that the internal gas will enter the pressure chamber 35. While entering, the pressure inside the pressure chamber 35 is increased. Through the seal of the first piston end 51, the pressure acts on the first piston end 51 and drives the first piston end 51 to exit the pressure chamber 35. The first piston end 51 and the side connecting rod 22 are an integrated structure and drive the side connecting rod 22 to move together.

[0055] The expansion trajectory of the guard plate 21 and the end angle connecting frame 23: the driving pressure of multiple side connecting rods 22 provides a lateral thrust to the guard plate 21, and the guard plate 21 does not have a lateral movement trajectory, so that the thrust acting in the guard plate 21 is balanced by the side connecting rods 22, so that the side connecting rods 22 move obliquely outward and drive the guard plate 21 to move outward, and through the vertical connection between the guard plate 21 and the side connecting rods 22, the oblique force of the side connecting rods 22 driving the guard plate 21 to move is converted into a lateral thrust of the guard plate 21 and moves outward, while expanding and pulling the end angle connecting frame 23 to move synchronously, and at the same time supporting it through the telescopic rod 42, while providing a limiting effect, so that the limiting shaft 43 slides on the slide The interior of the groove 44 is expanded, thereby increasing the space inside the guard plate 21 and forming an isolation chamber 6 between the lithium battery shell 1 and the protective frame 2. The isolation chamber 6 provides isolation between the lithium battery shell 1 and the protective frame 2. By expanding the lithium battery shell 1, an isolation area is formed between the lithium battery shell 1 and the protective frame 2, isolating the lithium battery shell 1 and the protective frame 2 to prevent adverse external conditions from affecting the safe use of the lithium battery. In addition, the guard plate 21, the side connecting rods 22, and the end angle connecting frame 23 are in a state of mutual contact, thereby having a certain sealing effect. Therefore, it can also prevent the internal fire from spreading outward, thereby enabling the device to protect the internal lithium battery and isolate the external conditions.

[0056] By cooperating with the guard plate 21 and the side connecting rod 22, the high pressure state of the high pressure tank 31 itself is utilized to increase the pressure inside the pressure chamber 35. Through the sealing of the first piston end 51, the pressure acts on the first piston end 51 and drives the first piston end 51 to withdraw from the pressure chamber 35. The first piston end 51 and the side connecting rod 22 are an integral structure, and drive the side connecting rod 22 to move together. At the same time, the end angle connecting frame 23 is pulled to move synchronously, and the internal space provided by the protective frame 2 is increased to form an isolation chamber 6, which isolates the lithium battery shell 1 from the protective frame 2 to prevent the safe use of the lithium battery from being affected by adverse external conditions. The guard plate 21 and the side connecting rod 22 and the end angle connecting frame 23 are in a mutually fitted state and have a certain sealing effect. Therefore, it can also isolate the internal fire from spreading outward, so that the device has the function of protecting the internal lithium battery and isolating from external conditions.

[0057] Example 2

[0058] This embodiment is an improvement made on the basis of embodiment 1. For details, please refer to Figure 1-7 The expansion and contraction component 5 further includes a matching notch 53 and a second delivery groove 54. A matching notch 53 is further provided on one side of the first piston end 51, and a second delivery groove 54 is symmetrically provided inside the guard plate 21.

[0059] One end of the mating notch 53 is used to communicate with the second conveying trough 54;

[0060] The interior of the guard plate 21 has four extension slots 57 in a circular array. The outer surface of the extension slot 57 is provided with an exhaust port 58 located outside the guard plate 21. One end of the extension slot 57 is used to communicate with the second conveying slot 54.

[0061] The driving protection component 3 further includes a solenoid valve 32 and a connecting hose 33. The solenoid valve 32 is installed on one side of the high-pressure tank 31;

[0062] A connecting hose 33 is installed at one end of the solenoid valve 32 , and one end of the connecting hose 33 is communicated with the first conveying groove 34 .

[0063] After aging, lithium batteries are prone to spontaneous combustion. After spontaneous combustion occurs, conventional fire extinguishing methods are difficult to extinguish, and carbon dioxide is required for fire extinguishing.

[0064] When the first piston end 51 is pushed outward by the pressure in the pressure chamber 35, it drives the side connecting rod 22 to move together. After the first piston end 51 moves to the position of the second conveying groove 54, the matching groove 53 will be connected to the second conveying groove 54, and the carbon dioxide gas will be conveyed into the interior of the second conveying groove 54. Then, the carbon dioxide gas is conveyed from the second conveying groove 54 to the extension groove 57. The extension groove 57 discharges the carbon dioxide gas from the interior of the device through the exhaust port 58 and into the isolation chamber 6 area. The protective plate 21, the side connecting rod 22 and the end angle connecting frame 23 are in a state of mutual contact, which has a certain sealing effect, so that the carbon dioxide is filled in the isolation chamber 6 area. The above structure is to respond to the occurrence of fire inside the lithium battery shell 1 to prevent the spread of fire. It can also be used simultaneously with the expansion and contraction protection effect provided by the lithium battery shell 1 and the protective frame 2. The two can be combined to enable the device to have external protection and internal fire handling functions, further enhancing the protection effect of the device.

[0065] Example 3

[0066] The present invention also provides a lithium battery protection device and protection method, wherein:

[0067] S1. Drive: The high-pressure tank 31 provides carbon dioxide to the device and provides high-pressure driving power. The high-pressure gas is delivered to the interior of the first delivery trough 34 through the connecting hose 33. The first delivery trough 34 then delivers the high-pressure gas to the interior of the pressure chamber 35.

[0068] S2. Expansion and contraction of the guard plate 21 and the side connecting rod 22: Through the conveying effect of the first conveying groove 34 and the connecting hose 33, the interior of the high-pressure tank 31 is connected to the pressure chamber 35. When the pressure inside the high-pressure tank 31 is greater than that in the pressure chamber 35, the pressure inside the high-pressure tank 31 will quickly enter the pressure chamber 35 and push the first piston end 51 outward. The first piston end 51 and the side connecting rod 22 are an integral structure. When the first piston end 51 is pushed out, the two guard plates 21 are vertically separated from each other and realize the telescopic state with the side connecting rod 22.

[0069] S3. Protective isolation: The protective plate 21 has six sides distributed on the outside of the lithium battery shell 1. When the protective frame 2 is expanded as a whole, it will drive the limiting shaft 43 to slide inside the slide groove 44, providing a limiting effect while sliding. After the protective frame 2 is expanded, it can increase the volume inside the device, so that an isolation cavity 6 is formed between the lithium battery shell 1 and the protective frame 2 shell, changing the contact mode between the two and isolating them.

[0070] S4. Fire extinguishing measures: After the interior is subjected to high pressure, the side connecting rod 22 is linked to move outward through the first piston end 51. After the side connecting rod 22 moves to the current position of the second conveying groove 54, one end of the matching slot 53 will be connected to the second conveying groove 54, so that the pressure is conveyed from the second conveying groove 54 to the inside of the extension groove 57, and then the extension groove 57 conveys the pressure to the outside and to the cavity of the isolation chamber 6 to perform the fire extinguishing operation.

[0071] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0072] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A lithium battery protection device, comprising a lithium battery housing (1) and a protective frame (2) outside the lithium battery housing (1), characterized in that: The protective frame (2) comprises a guard plate (21), a side connecting rod (22) and an end angle connecting frame (23); the lithium battery shell (1) is a cube; six surfaces of the lithium battery shell (1) are all mounted with guard plates (21); a side connecting rod (22) is mounted on one side of the guard plate (21); the side connecting rod (22) is used to connect two adjacent guard plates (21); The two ends of the side connecting rod (22) are at right angles and are in a telescopic connection state with one end of each guard plate (21); Each of the four end corners of the guard plate (21) is equipped with an end corner connecting frame (23), and the end corner connecting frame (23) is used to connect the end corners of the three guard plates (21) to each other in a sliding connection state; Between each two guard plates (21), a volume expansion function is provided through a telescopic connection with a side connecting rod (22); Each of the two side edges of the guard plate (21) is provided with a driving guard component (3), the driving guard component (3) comprising a first conveying groove (34) and a pressure chamber (35), the pressure chamber (35) being provided on both sides of the guard plate (21), the side connecting rod (22) being used for sliding in the pressure chamber (35), and the first conveying groove (34) being provided inside the side connecting rod (22); Each end corner of the lithium battery shell (1) is equipped with an end corner connecting component (4), the end corner connecting component (4) comprising an inner end corner (41) and a telescopic rod (42), the outer side of the inner end corner (41) is equipped with a telescopic rod (42), and the telescopic rod (42) is used to support the movable change between the end corner connecting frame (23) and the lithium battery shell (1); After the guard plate (21) has completed expansion, a cavity is provided between the guard plate (21) and the lithium battery shell (1), and the cavity is an isolation cavity (6); The end corner connecting component (4) further comprises a limiting shaft (43) and a sliding groove (44), the four end corners of the guard plate (21) are provided with a sliding groove (44), and the three inner surfaces of the end corner connecting frame (23) are provided with a limiting shaft (43); The limiting shaft (43) is used to extend inside the slide groove (44), and the limiting shaft (43) and the slide groove (44) are used to ensure the sliding connection between the guard plate (21) and the end angle connecting frame (23); An expansion and contraction component (5) is provided inside the guard plate (21), the expansion and contraction component (5) including a first piston end (51) and a through groove (52), one end of the end angle connecting frame (23) is provided with the first piston end (51), the driving guard component (3) further includes a connecting hose (33), one end of the connecting hose (33) is provided with a through groove (52) located in the first piston end (51); A pressure-assisting plate (55) is provided at one end of the inner wall of the pressure chamber (35), and a second piston end (56) is provided at one end of the pressure-assisting plate (55); One end of the pressure-assisting plate (55) is used to extend to the inside of the connecting hose (33), and the second piston end (56) is used to seal the inside of the through groove (52). A high-pressure tank (31) is installed on the side of each of the guard plates (21), and the inside of the high-pressure tank (31) is filled with carbon dioxide gas.

2. The lithium battery protection device according to claim 1, characterized in that: The expansion and contraction component (5) further includes a matching notch (53) and a second conveying groove (54); a matching notch (53) is further provided on one side of the first piston end (51); and a second conveying groove (54) is symmetrically provided inside the guard plate (21); One end of the matching slot (53) is used to communicate with the second conveying slot (54).

3. The lithium battery protection device according to claim 2, characterized in that: The interior of the guard plate (21) has four extension grooves (57) in a circular array, and the outer surface of the extension groove (57) is provided with an exhaust port (58) located outside the guard plate (21), and one end of the extension groove (57) is used to communicate with the second conveying groove (54).

4. The lithium battery protection device according to claim 3, characterized in that: The driving protection component (3) further includes a solenoid valve (32), and the solenoid valve (32) is installed on one side of the high-pressure tank (31); A connecting hose (33) is installed at one end of the solenoid valve (32), and one end of the connecting hose (33) is communicated with the first conveying trough (34).

5. The protection method of the lithium battery protection device according to claim 4, characterized in that: S1. Driving: The high-pressure tank (31) provides carbon dioxide to the device while providing high-pressure driving power, which is delivered to the inside of the first delivery trough (34) through the connecting hose (33). The first delivery trough (34) then delivers the high-pressure gas to the inside of the pressure chamber (35); S2, expansion and contraction of the guard plate (21) and the side connecting rod (22): through the conveying effect of the first conveying groove (34) and the connecting hose (33), the interior of the high-pressure tank (31) is connected to the pressure chamber (35), and the pressure inside the high-pressure tank (31) is greater than that of the pressure chamber (35), so that the pressure inside the high-pressure tank (31) will quickly enter the pressure chamber (35) and push the first piston end (51) outward. The first piston end (51) and the side connecting rod (22) are an integrated structure. When the first piston end (51) is pushed out, the two guard plates (21) are separated in a vertical direction and the telescopic state with the side connecting rod (22) is achieved; S3, protection isolation: The protective plate (21) has six surfaces distributed on the outside of the lithium battery shell (1). When the protective frame (2) expands as a whole, it will drive the limiting shaft (43) located inside the slide groove (44) to slide, providing a limiting effect while sliding. After the protective frame (2) expands, it can increase the volume inside the device, so that an isolation cavity (6) is formed between the lithium battery shell (1) and the protective frame (2) shell, changing the contact mode between the two and isolating the two; S4. Fire extinguishing measures: After the internal part is subjected to a high-pressure state, the side connecting rod (22) is moved outward through the linkage of the first piston end (51). After the side connecting rod (22) moves to the current position of the second conveying groove (54), one end of the matching slot (53) will be in a connected state with the second conveying groove (54), so that the pressure is conveyed from the second conveying groove (54) to the inside of the extension groove (57), and then the extension groove (57) conveys the pressure to the outside and to the cavity of the isolation chamber (6) to perform the fire extinguishing operation.

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