A vibration damping and fixing device for a new energy vehicle battery pack

Abstract

The present invention discloses a vibration damping and fixing device for a new energy vehicle battery pack, which relates to the technical field of new energy vehicle battery packs. It includes a battery pack body, a power cord is arranged above the battery pack body, a base is arranged outside the battery pack body, a cover plate is arranged above the base, an annular cavity is arranged between the battery pack body and the base, and a coolant is carried inside the annular cavity. The annular cavity includes a rigid part and a flexible part, and a plurality of vibration damping parts are arranged at equal intervals inside the annular cavity. The vibration damping parts are used to reduce the vibration amplitude of the battery pack body under the driving state. The vibration damping parts include sliding columns, a first spring and fixed cylinders. Both ends of the first spring are fixedly connected to the sliding column and the fixed cylinder respectively. The end of the fixed cylinder is fixedly connected to the rigid part, and the end of the sliding column is fixedly connected to the flexible part. In this device, an adaptive resistance measure is provided for the extrusion of the battery pack body to ensure good buffer and vibration damping performance.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy vehicle battery packs, and specifically to a vibration damping and fixing device for a new energy vehicle battery pack. Background Technique

[0002] With the continuous application and development of new energy vehicles, new energy vehicles have become the main development trend of automobiles. A new energy vehicle refers to an automobile that uses unconventional vehicle fuels as the power source and integrates advanced technologies in vehicle power control and driving, forming an automobile with advanced technical principles, new technologies, and new structures. As one of its core components, the safety and stability of the battery pack are of crucial importance.

[0003] At present, the protection for the battery pack mainly focuses on two aspects. One is the protection component that delays the spread of thermal runaway of the battery pack, such as arranging fireproof and heat-insulating materials between battery modules and between the battery module and the box cover; the other is to prevent the spread of thermal runaway through a fire extinguishing device, such as spraying fire extinguishing agents or various solutions. These two protection methods have relatively complex manufacturing processes and high costs, and can only delay the spread of thermal runaway of the battery pack, and cannot reduce the probability of thermal runaway of the battery pack from the source. If the subsequent treatment is not timely, the vehicle is still very likely to catch fire or even explode. Therefore, designing a simple and effective buffer and vibration damping component to improve the buffer and vibration damping performance of the battery pack and reduce the thermal runaway of lithium batteries caused by resonance or vehicle collision accidents from the source is an urgent problem to be solved.

[0004] Therefore, the present invention proposes a vibration damping and fixing device for a new energy vehicle battery pack. Summary of the Invention

[0005] The object of the present invention is to provide a vibration damping and fixing device for a new energy vehicle battery pack to solve the problems raised in the above-mentioned background technology. To achieve the above object, the present invention provides the following technical solution: A vibration damping and fixing device for a new energy vehicle battery pack, including a battery pack body, a power cord is provided above the battery pack body, a base is provided outside the battery pack body, a cover plate is provided above the base, an annular cavity is provided between the battery pack body and the base, a coolant is contained inside the annular cavity, the annular cavity includes a rigid part and a flexible part, and a plurality of equally spaced vibration damping parts are provided inside the annular cavity. The vibration damping parts are used to reduce the vibration amplitude of the battery pack body under the driving state. The vibration damping part includes a sliding column, a first spring and a fixed cylinder. The two ends of the first spring are respectively fixedly connected to the sliding column and the fixed cylinder. The end of the fixed cylinder is fixedly connected to the rigid part, and the end of the sliding column is fixedly connected to the flexible part. The driving vibration of the battery pack body is absorbed by a plurality of vibration damping parts and the flexible part of the annular cavity, improving the buffer and vibration damping performance of the battery pack body. A pair of square rods are provided above the base, the square rods are inserted into the inside of the cover plate, a limiting rod is provided on one side of the base, the limiting rod passes through the cover plate and the square rods and is slidably connected to both of them. An ejection unit for pushing the base and the battery pack body to pop out of the vehicle body together is provided on one side of the cover plate. Through the ejection unit, the battery pack body is quickly separated from the vehicle body, reducing the probability of thermal runaway of the battery pack body from the source.

[0006] Preferably, the ejection unit includes a T-shaped rod located at the end of the limiting rod. An electric push rod is provided on one side of the T-shaped rod. A bent plate is provided on the side of the cover plate. An electric cylinder is provided below the bent plate. A push plate is provided at the end of the electric cylinder. The side of the push plate is in contact with the outer wall of the base. A Z-shaped rod is provided on the outer wall of the base. A cutter is provided at the end of the Z-shaped rod. The cutter is located on one side of the power cord. A collision sensor is provided inside the base. The collision sensor, the electric push rod and the electric cylinder are all electrically connected.

[0007] Preferably, a flexible clamp is provided on the outer wall of the power cord. A chuck is provided at the end of the flexible clamp. A bent rod is provided on one side of the chuck. The bent rod is located on the outer wall of the limiting rod and is fixedly connected to it.

[0008] Preferably, two pairs of rollers are provided at the bottom of the annular cavity. The lower ends of the rollers extend outwards from the bottom of the base.

[0009] Preferably, a fixing piece is provided on the outer wall of the sliding column. An impeller is provided on one side of the fixing piece. A connecting shaft is provided on the inner wall of the impeller. A connecting rod is provided at the bottom end of the connecting shaft. The end of the connecting rod is fixedly connected to the rigid part. A ejector rod is provided inside the connecting rod. A second spring is provided at the bottom of the ejector rod. The end of the ejector rod is shaped like an inclined plane. When the ejector rod drives the fixing piece to displace inside the annular cavity, the water flow generated by the fixing piece drives the impeller to rotate self - clockwise along the connecting shaft. When the impeller rotates counter - clockwise, the bottom end of the impeller contacts the inclined plane area of the ejector rod. When the impeller rotates clockwise, the bottom end of the impeller contacts the vertical area of the ejector rod.

[0010] Preferably, there are multiple impellers inside the annular cavity, and they are all evenly distributed. All the impellers inside the annular cavity rotate in the same direction.

[0011] Preferably, a pair of fixing boxes containing fire extinguishing agent are provided on the inner wall of the base. The wall of the fixing box is provided with a through - groove for the fire extinguishing agent to spray out. A blocking strip for blocking the through - groove is provided at the bottom of the cover plate. The side of the blocking strip is in contact with the side of the fixing box. Air pipes are provided at the ends of both fixing boxes. An air pump is provided inside the base. The air pipes are connected to the air outlet of the air pump. The air pump is electrically connected to the collision sensor.

[0012] The present invention has at least the following beneficial effects:

[0013] 1. In the present invention, when the battery pack body vibrates due to vehicle driving, the damping part inside the annular cavity will perform mechanical damping through the first spring. At the same time, the coolant and the flexible part inside the annular cavity will also absorb the extrusion force, providing a flexible damping function for the battery pack body. The two cooperate with each other to further improve the damping performance of the battery pack body. Due to the fluidity of the coolant liquid, the coolant inside the annular cavity will also displace in the same direction as the battery pack body due to inertia, increasing the content of the coolant in the area of the annular cavity that is about to be squeezed, thereby providing an adaptive resistance measure for the extrusion of the battery pack body and ensuring good buffer and damping performance. The squeezed damping part will also drive the coolant to circulate around the battery pack body, which is beneficial to fully dissipate the heat of the outer wall of the battery pack body and reduce the probability of thermal runaway of the battery pack body.

[0014] 2. In the present invention, after the vehicle undergoes an accidental collision, the electric push rod will drive two limit rods to be withdrawn from the inside of the cover plate and the square rod. In this state, the base and the battery pack body will disengage downward from the inside of the cover body. At the same time, the blocking strip will lose its blockage of the through groove, and the air pump will cause the fire extinguishing agent inside the fixed box to be ejected through the air pipe and fall on the surface of the battery pack body to reduce the possibility of the battery pack catching fire. Immediately afterwards, the electric cylinder applies a lateral thrust to the base, and the base will drive the cutter to cut multiple power supply lines, so that the battery pack body is separated from the vehicle body itself, and the base and the battery pack body will quickly slide outwards from the bottom of the vehicle body after the collision, thereby reducing the probability of thermal runaway of the battery pack body from the source and protecting the life safety of the driver. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0016] Figure 2 is a schematic diagram of the separated structure of the cover body and the base of the present invention;

[0017] Figure 3 For the present invention Figure 2 is an enlarged view of the structure of area A in the present invention;

[0018] Figure 4 is a cross-sectional view of the base, cover body and annular cavity structure of the present invention;

[0019] Figure 5 For the present invention Figure 4 is an enlarged view of the structure of area B in the present invention;

[0020] Figure 6 is a cross-sectional top view of the annular cavity structure of the present invention;

[0021] Figure 7 For the present invention Figure 6 is an enlarged view of the structure of area C in the present invention;

[0022] Figure 8 is a schematic diagram of the vibration damping part structure of the present invention;

[0023] Figure 9 is a cross-sectional view of the vibration damping part structure of the present invention;

[0024] Figure 10 is a cross-sectional view of the fixed box and the blocking strip structure of the present invention;

[0025] Figure 11 For the present invention Figure 10 is an enlarged view of the structure of area D in the present invention.

[0026] In the figure: 1 - Battery pack body; 2 - Power cord; 3 - Base; 4 - Cover plate; 5 - Annular cavity; 6 - Rigid part; 7 - Flexible part; 8 - Vibration damping part; 9 - Slide post; 10 - First spring; 11 - Fixed cylinder; 12 - Square rod; 13 - Limit rod; 14 - Ejection unit; 15 - T-shaped rod; 16 - Electric push rod; 17 - Bent plate; 18 - Electric cylinder; 19 - Push plate; 20 - Z-shaped rod; 21 - Tool; 22 - Collision sensor; 23 - Flexible fixture; 24 - Chuck; 25 - Bent rod; 26 - Roller; 27 - Fixed piece; 28 - Impeller; 29 - Connecting shaft; 30 - Connecting rod; 31 - Jacking rod; 32 - Second spring; 33 - Fixed box; 34 - Through groove; 35 - Stop bar; 36 - Air pipe; 37 - Air pump. Specific embodiments

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0028] Please refer to Figure 1-11 , the present invention provides a technical solution: a vibration damping and fixing device for a new energy vehicle battery pack, including a battery pack body 1. A power cord 2 is provided above the battery pack body 1. The power cord 2 is used to transmit necessary electric driving force into the vehicle body. A base 3 is provided outside the battery pack body 1. A cover plate 4 is provided above the base 3. The top of the cover plate 4 is fixedly connected to the bottom of the vehicle body by bolts. A pair of square rods 12 are provided above the base 3. The bottom ends of the square rods 12 are fixedly connected to the base 3. The square rods 12 are inserted into the cover plate 4 and are slidably connected thereto. A limit rod 13 is provided on one side of the base 3. The limit rod 13 is slidably connected to the cover plate 4. The limit rod 13 passes through the cover plate 4 and the square rod 12 and is slidably connected to both. By inserting the limit rod 13 into the square rod 12 and the cover body, the two are fixed to each other, and the entire battery pack body 1 is installed on the bottom of the vehicle body, which is convenient for quickly detaching the battery pack body 1 in case of emergency.

[0029] There is an annular cavity 5 between the battery pack body 1 and the base 3. The outer wall of the annular cavity 5 is fixedly connected to the inner wall of the base 3. The interior of the annular cavity 5 contains coolant, and the coolant is not completely filled, which can ensure good fluidity of the coolant inside the annular cavity 5. The annular cavity 5 includes a rigid part 6 and a flexible part 7. The rigid part 6 is in contact with the inner wall of the base 3, and the flexible part 7 is in contact with the outer wall of the battery pack body 1, which is used to absorb the vibration force generated by the movement of the battery pack body 1. A plurality of equally spaced damping parts 8 are provided inside the annular cavity 5. The damping parts 8 are used to reduce the vibration amplitude of the battery pack body 1 in the driving state. The damping parts 8 include a sliding column 9, a first spring 10, and a fixed cylinder 11. The two ends of the first spring 10 are respectively fixedly connected to the sliding column 9 and the fixed cylinder 11. The end of the fixed cylinder 11 is fixedly connected to the rigid part 6, and the end of the sliding column 9 is fixedly connected to the flexible part 7. Each of the four sides of the battery pack body 1 has a plurality of equally spaced damping parts 8, which enables the battery pack body 1 during driving to be protected by buffering in multiple directions. At the same time, after the coolant in the annular cavity 5 is squeezed, due to its liquid fluidity, the impact buffering force will be further reduced, achieving a good damping effect.

[0030] Please refer to Figures 6-9 , a fixing piece 27 is provided on the outer wall of the sliding column 9 and fixedly connected thereto. On one side of the fixing piece 27, there is an impeller 28. A connecting shaft 29 is provided on the inner wall of the impeller 28 and rotatably connected thereto. A connecting rod 30 is provided at the bottom end of the connecting shaft 29 and fixedly connected thereto. The end of the connecting rod 30 is fixedly connected to the rigid part 6. A push rod 31 is provided inside the connecting rod 30 and slidably connected thereto. A second spring 32 is provided at the bottom of the push rod 31. The two ends of the second spring 32 are respectively fixedly connected to the push rod 31 and the connecting rod 30. The end of the push rod 31 is shaped like an inclined surface. When the push rod 31 drives the fixing piece 27 to displace inside the annular cavity 5, the water flow generated by the fixing piece 27 drives the impeller 28 to rotate self - clockwise along the connecting shaft 29. The flowing water flow generated by the rotation of the impeller 28 can keep the coolant in the annular cavity 5 in a continuous flowing state, thereby dissipating heat from each area of the battery pack body 1.

[0031] When the impeller 28 rotates counterclockwise, the bottom end of the impeller 28 contacts the inclined surface area of the ejector rod 31. During this process, the end of the ejector rod 31 will retract into the inside of the connecting rod 30 due to the resistance force of the impeller 28 until the bottom of the impeller 28 passes over the ejector rod 31, and then the ejector rod 31 will pop out again under the elastic force of the second spring 32. When the impeller 28 rotates clockwise, the bottom end of the impeller 28 contacts the vertical area of the ejector rod 31. In this state, the impeller 28 will stop rotating due to the resistance effect. There are multiple impellers 28 inside the annular cavity 5, and they are all evenly distributed. The inclined surface shape of the end of the above-mentioned ejector rod 31 and the resistance effect of the bottom of the impeller 28 will drive all the impellers 28 in the annular cavity 5 to rotate in the same direction, so that the coolant flows in the same direction around the battery pack body 1; The driving vibration of the battery pack body 1 is absorbed by the plurality of damping parts 8 and the flexible part 7 of the annular cavity 5, improving the buffer and damping performance of the battery pack body 1.

[0032] Working principle of vibration damping and heat dissipation:

[0033] During the vehicle driving process, when starting, braking and steering, the battery pack body 1 will undergo a slight displacement to one side due to inertia. During this process, the sliding column 9 inside the annular cavity 5 will be squeezed, and the battery pack body 1 will be vibration-damped through the elastic effect of the first spring 10. Since the number of damping parts 8 in the annular cavity 5 is large and evenly distributed, good damping effects can be achieved on multiple sides of the battery pack body 1; On the other hand, since the flexible part 7 of the annular cavity 5 contacts the side of the battery pack body 1, while the damping part 8 performs mechanical vibration damping through the first spring 10, the absorption of the extrusion force by the coolant and the flexible part 7 in the annular cavity 5 also provides a flexible vibration damping function for the battery pack body 1. The two cooperate with each other to further improve the vibration damping performance of the battery pack body 1. In addition, due to the fluidity of the coolant liquid, when the vehicle undergoes starting, braking and steering actions, the coolant in the annular cavity 5 will also undergo the same-direction displacement as the battery pack body 1 due to inertia, resulting in an increase in the coolant content in the area of the annular cavity 5 that is about to be squeezed, thereby providing an adaptive resistance measure for the extrusion of the battery pack body 1 and ensuring good buffer and damping performance.

[0034] Further, the squeezed sliding column 9 drives the fixing piece 27 to displace within the annular cavity 5. The displaced fixing piece 27 drives the coolant to flow, thereby causing the impeller 28 to rotate within the coolant. The rotating impeller 28 keeps the coolant inside the annular cavity 5 in a flowing state. Due to the abutting relationship between the bottom of the rotating impeller 28 and the inclined surface area at the end of the ejector rod 31, the rotation directions of all the impellers 28 within the annular cavity 5 are the same. Each time the battery pack body 1 vibrates, it squeezes a certain sliding column 9 within the annular cavity 5, so it will inevitably drive the corresponding impeller 28 to rotate. Therefore, the coolant within the annular cavity 5 will continuously flow in one direction during the continuous rotation of the impeller 28, allowing the coolant to circulate around the battery pack body 1, which is beneficial to fully dissipate the heat from the outer wall of the battery pack body 1, provide a stable working environment for the battery pack body 1, and reduce the probability of thermal runaway of the battery pack body 1.

[0035] Please refer to Figures 1-4 , on one side of the cover plate 4, there is an ejection unit 14 that pushes the base 3 and the battery pack body 1 out of the vehicle body together. Through the ejection unit 14, the battery pack body 1 can be quickly separated from the vehicle body, reducing the probability of thermal runaway of the battery pack body 1 from the source; the ejection unit 14 includes a T-shaped rod 15 located at the end of the limit rod 13. The end of the limit rod 13 is fixedly connected to the T-shaped rod 15. On one side of the T-shaped rod 15, there is an electric push rod 16 and it is fixedly connected to the T-shaped rod 15. On the side of the cover plate 4, there is a bent plate 17 and it is fixedly connected to the cover plate 4. The bottom end of the electric push rod 16 is fixedly connected to the bent plate 17. Below the bent plate 17, there is an electric cylinder 18 and it is fixedly connected to the bent plate 17. At the end of the electric cylinder 18, there is a push plate 19 and it is fixedly connected to the electric cylinder 18. The side of the push plate 19 is in contact with the outer wall of the base 3. On the outer wall of the base 3, there is a Z-shaped rod 20 and it is fixedly connected to the base 3. At the end of the Z-shaped rod 20, there is a cutter 21 and it is fixedly connected to the Z-shaped rod 20. The cutter 21 is located on one side of the power cord 2. The impact force of the electric cylinder 18 is sufficient to drive the cutter 21 to quickly cut multiple power cords 2.

[0036] On the outer wall of the power cord 2, there is a flexible fixture 23. The inner wall of the flexible fixture 23 is in contact with the outer wall of the power cord 2, which is used to restrain the perpendicularity of the power cord 2. At the end of the flexible fixture 23, there is a chuck 24 and it is fixedly connected to the flexible fixture 23. On one side of the chuck 24, there is a bent rod 25 and it is fixedly connected to the chuck 24. The bent rod 25 is L-shaped. The bent rod 25 is located on the outer wall of the limit rod 13 and is fixedly connected to the limit rod 13. Inside the base 3, there is a collision sensor 22 and it is fixedly connected to the base 3. The collision sensor 22, the electric push rod 16, and the electric cylinder 18 are all electrically connected. At the bottom of the annular cavity 5, there are two pairs of rollers 26. The connecting piece at the upper end of the roller 26 is fixedly connected to the bottom of the annular cavity 5 by bolts. The lower end of the roller 26 extends outwards from the bottom of the base 3. The four rollers 26 can help the base 3 and the battery pack body 1 be quickly pushed out of the vehicle body.

[0037] In addition, please refer to Figures 10-11 A pair of fixed boxes 33 containing fire extinguishing agent are provided on the inner wall of the base 3, the outer wall of the fixed box 33 is fixedly connected to the inner wall of the base 3, the wall of the fixed box 33 is provided with a through groove 34 for spraying the fire extinguishing agent, and a baffle 35 for shielding the through groove 34 is provided at the bottom of the cover plate 4, the upper end of the baffle 35 is fixedly connected to the cover plate 4, and the side of the baffle 35 is in contact with the side of the fixed box 33, and the ends of the two fixed boxes 33 are provided with air pipes 36 and connected with each other, an air pump 37 is provided inside the base 3 and fixedly connected with it, the air pipe 36 is connected with the air outlet of the air pump 37, and the air pump 37 is electrically connected to the collision sensor 22, and the collision sensor 22 can send a start signal to the air pump 37 when a serious collision occurs to the sensed vehicle body.

[0038] How the pop-up process works:

[0039] After the vehicle has an unexpected collision and exceeds the preset index of the collision sensor 22, the collision sensor 22 will simultaneously send a start signal to the electric push rod 16 and the air pump 37, and the electric push rod 16 will use the T-shaped rod 15 to pull the two limit rods 13 out of the cover plate 4 and the square rod 12. In this state, the base 3 and the battery pack body 1 will drive the square rod 12 to detach from the inside of the cover body due to their own gravity until the two sets of rollers 26 at the bottom of the annular cavity 5 are in contact with the ground; at the same time, the downward moving base 3 will also drive the fixed box 33 to move downward, so that the baffle 35 fixedly connected to the cover body loses its shielding of the through groove 34, and the air pump 37 will inject gas into the two fixed boxes 33 through the air pipe 36, so that the fire extinguishing agent inside the fixed box 33 is sprayed outward from the through groove 34 and falls on the surface of the battery pack body 1, so as to reduce the possibility of spontaneous combustion of the battery pack;

[0040] Then, the electric cylinder 18 will also receive the start signal of the collision sensor 22, driving the push plate 19 to apply a strong lateral thrust to the base 3. During this process, the base 3 will drive the tool 21 to cut multiple power cords 2 through the Z-shaped rod 20. In the process of the limit rod 13 being pulled out from the cover body and the square rod 12, the limit rod 13 will drive the flexible clamp 23 at one end of the bending rod 25 to slightly pull the wire body part of the power cord 2. The movement trend of this pulling is exactly opposite to the movement trend of the tool 21 with the displacement of the base 3. Therefore, the tool 21 can cut off the power cord 2 more easily, so that the battery pack body 1 is separated from the vehicle body itself. After the pushing action of the electric cylinder 18, the base 3 and the battery pack body 1 will quickly slide out from the bottom of the vehicle body after the collision, thereby reducing the probability of thermal runaway of the battery pack body 1 from the source and protecting the life safety of the driver.

[0041] It should be noted that in this text, relational terms such as first and second are only used 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 "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0042] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A vibration damping and fixing device for a new energy vehicle battery pack, comprising a battery pack body (1), a power cord (2) is arranged above the battery pack body (1), and a base (3) is arranged outside the battery pack body (1). It is characterized in that: A cover plate (4) is arranged above the base (3). An annular cavity (5) is arranged between the battery pack body (1) and the base (3). The interior of the annular cavity (5) is filled with coolant. The annular cavity (5) comprises a rigid part (6) and a flexible part (7). A plurality of vibration damping parts (8) are arranged at equal intervals inside the annular cavity (5). The vibration damping parts (8) are used to reduce the vibration amplitude of the battery pack body (1) during driving. The vibration damping parts (8) comprise sliding columns (9), first springs (10) and fixed cylinders (11). The two ends of the first springs (10) are respectively fixedly connected to the sliding columns (9) and the fixed cylinders (11). The end of the fixed cylinder (11) is fixedly connected to the rigid part (6). The end of the sliding column (9) is fixedly connected to the flexible part (7). The driving vibration of the battery pack body (1) is absorbed by the plurality of vibration damping parts (8) and the flexible part (7) of the annular cavity (5), improving the buffer and vibration damping performance of the battery pack body (1). A pair of square rods (12) are arranged above the base (3). The square rods (12) are inserted into the interior of the cover plate (4). A limiting rod (13) is arranged on one side of the base (3). The limiting rod (13) passes through the cover plate (4) and the square rods (12) and is slidably connected to both of them. An ejection unit (14) for pushing the base (3) and the battery pack body (1) to pop out of the vehicle body together is arranged on one side of the cover plate (4). Through the ejection unit (14), the battery pack body (1) is quickly separated from the vehicle body, reducing the probability of thermal runaway of the battery pack body (1) from the source. The ejection unit (14) comprises a T-shaped rod (15) located at the end of the limiting rod (13). An electric push rod (16) is arranged on one side of the T-shaped rod (15). A bent plate (17) is arranged on the side of the cover plate (4). An electric cylinder (18) is arranged below the bent plate (17). A push plate (19) is arranged at the end of the electric cylinder (18). The side surface of the push plate (19) is in contact with the outer wall of the base (3). A Z-shaped rod (20) is arranged on the outer wall of the base (3). A cutter (21) is arranged at the end of the Z-shaped rod (20). The cutter (21) is located on one side of the power cord (2). A collision sensor (22) is arranged inside the base (3). The collision sensor (22), the electric push rod (16) and the electric cylinder (18) are all electrically connected.

2. The vibration damping and fixing device for a new energy vehicle battery pack according to claim 1, characterized in that: A flexible fixture (23) is arranged on the outer wall of the power cord (2). A chuck (24) is arranged at the end of the flexible fixture (23). A bent rod (25) is arranged on one side of the chuck (24). The bent rod (25) is located on the outer wall of the limiting rod (13) and is fixedly connected to it.

3. The vibration damping and fixing device for a new energy vehicle battery pack according to claim 1, wherein: Two pairs of rollers (26) are arranged at the bottom of the annular cavity (5). The lower ends of the rollers (26) extend outwards from the bottom of the base (3).

4. The vibration damping and fixing device for a new energy vehicle battery pack according to claim 1, wherein: The outer wall of the sliding column (9) is provided with a fixing piece (27). One side of the fixing piece (27) is provided with an impeller (28). The inner wall of the impeller (28) is provided with a connecting shaft (29). The bottom end of the connecting shaft (29) is provided with a connecting rod (30). The end of the connecting rod (30) is fixedly connected to the rigid part (6). The inside of the connecting rod (30) is provided with a push rod (31). The bottom of the push rod (31) is provided with a second spring (32). The end of the push rod (31) is shaped like an inclined plane. When the push rod (31) drives the fixing piece (27) to displace inside the annular cavity (5), the water flow generated by the fixing piece (27) drives the impeller (28) to rotate around the connecting shaft (29). When the impeller (28) rotates counterclockwise, the bottom end of the impeller (28) contacts the inclined plane area of the push rod (31). When the impeller (28) rotates clockwise, the bottom end of the impeller (28) contacts the vertical area of the push rod (31).

5. The vibration damping and fixing device for a new energy vehicle battery pack according to claim 4, wherein: There are multiple impellers (28) inside the annular cavity (5), and they are all evenly distributed. All the impellers (28) inside the annular cavity (5) rotate in the same direction.

6. The vibration damping and fixing device for a new energy vehicle battery pack according to claim 1, wherein: The inner wall of the base (3) is provided with a pair of fixing boxes (33) containing fire extinguishing agent. The wall of the fixing box (33) is provided with a through groove (34) for the fire extinguishing agent to spray out. The bottom of the cover plate (4) is provided with a blocking strip (35) for blocking the through groove (34). The side of the blocking strip (35) contacts the side of the fixing box (33). The ends of both fixing boxes (33) are provided with air pipes (36). An air pump (37) is provided inside the base (3). The air pipe (36) is connected to the air outlet of the air pump (37). The air pump (37) is electrically connected to the collision sensor (22).

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