A replaceable battery protection chassis for new energy vehicles

Abstract

The present invention relates to the field of new energy vehicle technology, and specifically to a replaceable battery protection chassis for new energy vehicles, comprising: a chassis frame, a protective cover plate is provided in the middle of the chassis frame, and the protective cover plate is a hollow structure with an opening at the top; a heat exchange partition is provided between the upper side of the buffer layer and the battery pack body; a buffer component is adhesively fixed in the lower groove of the buffer layer, and the lower surface of the buffer component protrudes downward to the bottom of the buffer layer; an internal thread is provided on the lower inner wall of the stepped through hole, and the internal thread is adapted to the external thread; the beneficial effect is: by providing a buffer layer at the bottom of the protective cover plate, the buffer layer is wavy, a buffer component is installed in the lower groove of the buffer layer, and the lower surface of the buffer component protrudes to the bottom of the buffer layer, the buffer component can block most of the stones and rocks, reduce the impact force generated by them on the buffer layer, and the wavy structure of the buffer layer further weakens the impact force.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy vehicles, and in particular to a replaceable battery protection chassis for new energy vehicles. Background Art

[0002] The installation method of the power battery pack of new energy vehicles in the whole vehicle is to hoist it on the car chassis. After the battery pack is installed, in order to avoid direct collision between the battery pack and foreign objects when the car floor collides with foreign objects on the ground, causing damage to the battery pack, a protective structure needs to be installed on the outside of the battery pack for protection.

[0003] In the prior art, Chinese Utility Model No. CN219214739U discloses a composite structure of a new energy vehicle chassis and a battery pack, which enables quick disassembly between an upper cover and a lower cover.

[0004] However, conventional chassis covers are relatively simple in structure, relying solely on their own strength to protect the battery pack. On complex, gravelly and rocky roads, the chassis cover fails to effectively cushion the impact of these rocks and stones, resulting in limited protection for the battery pack during long-term driving. Therefore, the present invention proposes a replaceable battery protection chassis for new energy vehicles to address this issue. Summary of the Invention

[0005] The purpose of the present invention is to provide a replaceable battery protection chassis for new energy vehicles to solve the problems raised in the above background technology that the traditional chassis cover has a simple structure and limited protection effect on the battery pack.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a replaceable battery protection chassis for new energy vehicles, comprising:

[0007] A chassis frame, wherein a protective cover is provided in the middle of the chassis frame, the protective cover is a hollow structure with an opening at the top, and the battery pack body is provided in the inner cavity of the protective cover;

[0008] A buffer layer is provided at the bottom of the protective cover plate, and the cross-section of the buffer layer is wavy. A heat exchange partition is provided between the upper side of the buffer layer and the battery pack body. A cooling pipe is provided in the groove on the upper side of the protective cover plate.

[0009] A buffer member, the buffer member is adhesively fixed in the lower groove of the buffer layer, and the lower surface of the buffer member protrudes downward to below the buffer layer. The buffer member includes an upper and lower layers, namely a rubber layer and a metal layer. A stepped through hole is formed in the middle of the buffer member. A buffer is provided in the inner cavity of the stepped through hole. The upper end of the buffer is fixedly connected to the buffer layer;

[0010] The buffer includes an outer tube and an insert tube movably inserted into the inner cavity of the outer tube. The outer tube has a built-in thrust spring. The outer wall of the outer tube is provided with an external thread. The lower inner wall of the stepped through hole is provided with an internal thread, and the internal thread is adapted to the external thread.

[0011] Preferably, a boss is provided at the lower end of the outer cylinder, and the boss is in the shape of a truncated cone. A polygonal slot is provided in the middle of the boss, and an oil filling hole connected to the inner cavity of the outer cylinder is provided at the bottom of the polygonal slot, and a one-way valve is installed in the inner cavity of the oil filling hole. The inner cavity of the outer cylinder is filled with hydraulic oil, so that the outer cylinder can be fixedly connected to the metal layer.

[0012] Preferably, the insert is hollow inside and is provided with an opening at one end of the inner cavity of the outer tube. A sealing ring is fixedly sleeved on the outside of one end of the insert and is sealed with the inner wall of the outer tube. A sealing plate is fixed to the inner cavity of the open end of the insert, and damping holes are opened through the surface of the sealing plate, which ensures that the overall expansion and contraction of the buffer has a damping effect and can buffer and reduce shock to the metal layer.

[0013] Preferably, a concentric annular platform is fixed to the side of the sealing ring, one end of the thrust spring is against the side of the sealing ring and is sleeved on the outside of the annular platform, and a sealing ring is movably sleeved on the outside of the insert tube. The sealing ring is fixedly connected to the open end of the outer tube by bolts, thereby preventing the insert tube and the outer tube from detaching from each other.

[0014] Preferably, a strip base is fixed on both sides of the protective cover, and a suspension shaft rod parallel to the strip base is provided on the outer side of the strip base. The suspension shaft rod and the strip base are movably connected through a connecting arm. There are multiple connecting arms and they are evenly spaced along the length direction of the strip base, thereby realizing the suspension installation of the protective cover as a whole and the battery pack body.

[0015] Preferably, avoidance grooves are provided on the inner walls on both sides of the chassis frame, and suspension hooks are formed. The sides of the suspension hooks fit the outer walls of the protective cover plate, and the suspension shaft rod penetrates into the inner cavity of the avoidance groove from bottom to top, and the suspension shaft rod is stuck on the inner side of the suspension hook after being rotated close to the protective cover plate. The suspension shaft rod is suspended on the suspension hook by gravity, and a mud guard plate corresponding to a plurality of connecting arms is provided on the side of the suspension hook, so that the suspension shaft rod can be suspended on the inner side of the suspension hook under the action of the gravity of the protective cover plate.

[0016] Preferably, a recessed groove corresponding to the strip base is provided on the lower side of the suspension hook, and a tightening bolt is provided through a thread in the middle of the strip base. The upper end of the tightening bolt rests against the bottom of the recessed groove on the lower side of the suspension hook, and the lower open end of the avoidance groove is fixedly connected to a mud guard plate by bolts to prevent the protective cover plate from shaking and displacement.

[0017] Preferably, the length and width of the buffer layer are respectively smaller than the inner length and width of the protective cover plate, the cooling pipe is distributed in an "S" shape in the inner cavity of the protective cover plate, the diameter of the cooling pipe is smaller than the depth of the groove on the upper side of the buffer layer, and a flexible layer is padded on the lower side of the cooling pipe. The heat exchange baffle is placed on the upper side of the buffer layer and a gap is left between it and the cooling pipe, thereby realizing heat exchange and cooling of the battery pack body.

[0018] Preferably, the heat exchange baffle separates the inner cavity of the protective cover into two independent layers, and a positioning frame adapted to the battery pack body is fixed on the upper surface of the heat exchange baffle to prevent the battery pack body from shaking.

[0019] Preferably, an arc-shaped heat exchange plate is provided below the heat exchange baffle and is located in the groove on the upper side of the buffer layer, and the arc-shaped heat exchange plate is half-covered on the outside of the cooling tube. A plurality of heat exchange fins distributed at equal intervals are fixed on the outside of the arc-shaped heat exchange plate along its own length direction, and the heat exchange fins are fixed to the lower surface of the heat exchange baffle. The heat exchange fins are stuck in the groove on the upper side of the buffer layer and adapted thereto, which can further improve the cooling and heat exchange effect of the battery pack body.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The present invention provides a buffer layer at the bottom of the protective cover plate, the buffer layer is wavy, and the cooling pipe is arranged in the upper inner cavity of the buffer layer, which can reduce the space occupied and avoid the overall vertical thickness of the protective cover plate being too large. A buffer part is installed in the lower groove of the buffer layer, and the lower surface of the buffer part protrudes below the buffer layer. A buffer is installed inside the buffer part, and the upper end of the buffer is fixedly connected to the buffer layer. The distance between two adjacent buffer parts is small. When stones and rocks bounce up during the driving of the car, the buffer part can block and buffer most of the stones and rocks, greatly reducing the impact force on the buffer layer. Combined with the wavy structure of the buffer layer, the impact force is further weakened, thereby improving the protection effect on the battery pack body. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the present invention;

[0023] Figure 2 This is an exploded schematic diagram of the overall structure of the present invention;

[0024] Figure 3 This is an exploded schematic diagram of the heat exchange baffle and protective cover structure of the present invention;

[0025] Figure 4 This is a three-dimensional schematic diagram of the protective cover structure of the present invention;

[0026] Figure 5 It is a schematic cross-sectional view of the overall structure of the present invention;

[0027] Figure 6 It is a partially cutaway schematic diagram of the chassis frame structure of the present invention;

[0028] Figure 7 This is a schematic diagram of the connection between the suspension shaft and the chassis frame of the present invention;

[0029] Figure 8 It is a side sectional schematic diagram of the protective cover structure of the present invention;

[0030] Figure 9 This is a schematic diagram of the separation of the buffer component and the buffer layer structure of the present invention;

[0031] Figure 10 This is an exploded schematic diagram of the buffer structure of the present invention;

[0032] Figure 11 For the present invention Figure 2 A schematic diagram of the structure at center A;

[0033] Figure 12 For the present invention Figure 8 A magnified schematic diagram of the structure at point B in the middle.

[0034] In the figure: 1. chassis frame; 11. avoidance groove; 12. suspension hook; 13. mud guard; 2. protective cover; 21. buffer layer; 22. cooling pipe; 23. suspension shaft; 24. connecting arm; 25. bar base; 26. tightening bolt; 3. battery pack body; 4. heat exchange baffle; 41. positioning frame; 42. arc-shaped heat exchange plate; 43. heat exchange fin; 5. buffer; 51. rubber layer; 52. metal layer; 53. stepped through hole; 54. internal thread; 6. buffer; 61. outer cylinder; 611. thrust spring; 612. boss; 613. polygonal slot; 614. oil filling hole; 615. one-way valve; 616. external thread; 62. insert; 621. sealing plate; 622. damping hole; 623. annular platform; 63. sealing ring; 64. sealing ring. DETAILED DESCRIPTION

[0035] In order to clearly and completely describe the objectives and technical solutions of the present invention and make the advantages more clearly understood, the embodiments of the present invention are further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, not all of them, and are only used to explain the embodiments of the present invention, not to limit 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.

[0036] See also Figures 1 to 12 , the present invention provides a technical solution:

[0037] Embodiment 1. A replaceable battery protection chassis for new energy vehicles, comprising: a chassis frame 1 and a buffer member 5.

[0038] Specifically, a protective cover plate 2 is provided in the middle of the chassis frame 1. The middle part of the chassis frame 1 is in a "mouth" shape and is adapted to the protective cover plate 2, allowing the protective cover plate 2 to be installed from bottom to top. The protective cover plate 2 is a hollow structure with an opening in the upper part. A battery pack body 3 is arranged in the inner cavity of the protective cover plate 2. The battery pack body 3 is placed in the inner cavity of the protective cover plate 2 from top to bottom. According to actual needs, in order to prevent the battery pack body 3 from bouncing up and down in the inner cavity of the protective cover plate 2, a baffle (not shown in the figure) is also provided at the upper opening of the protective cover plate 2. The baffle can press down and compact the battery pack body 3 to prevent the battery pack body 3 from detaching from the inner cavity of the protective cover plate 2;

[0039] Secondly, a buffer layer 21 is provided at the bottom of the protective cover plate 2, and the cross-section of the buffer layer 21 is in a wavy shape. Combining Figure 4 and Figure 8 it can be seen that the buffer layer 21 and the protective cover plate 2 are of an integral structure. The buffer layer 21 is formed by stamping the bottom plate of the protective cover plate 2 by a stamping machine. A heat exchange partition 4 is provided between the upper side of the buffer layer 21 and the battery pack body 3. A cooling pipe 22 is provided in the upper groove of the protective cover plate 2. On the one hand, the heat exchange partition 4 is used to separate the cooling pipe 22 and the battery pack body 3 on the upper and lower sides, preventing the cooling pipe 22 from leaking water due to damage and seeping onto the surface of the battery pack body 3, resulting in a failure of the battery pack body 3. On the other hand, the heat exchange partition 4 cooperates with the cooling pipe 22 to exchange heat and cool the battery pack body 3, preventing the battery pack body 3 from generating excessive heat during operation and affecting its own lifespan;

[0040] Furthermore, the buffer member 5 is adhesively fixed in the lower groove of the buffer layer 21, and the lower surface of the buffer member 5 protrudes downward below the buffer layer 21. The buffer member 5 includes two layers, namely a rubber layer 51 and a metal layer 52. The rubber layer 51 is made of a relatively hard rubber material. Since the lower surface of the metal layer 52 is located below the buffer layer 21, it can block most of the stones, rocks and other debris that bounce up during vehicle driving, preventing these debris from directly hitting the buffer layer 21, thereby extending the service life of the buffer layer 21. A stepped through hole 53 is provided through the middle of the buffer member 5. A buffer 6 is arranged in the inner cavity of the stepped through hole 53. The upper end of the buffer 6 is fixedly connected to the buffer layer 21. The buffer 6 cooperates with the elastic deformation of the rubber layer 51 to improve the overall buffering performance of the buffer member 5, thereby reducing the possibility of the buffer member 5 being damaged due to impact;

[0041] In addition, the buffer 6 includes an outer tube 61 and an insert tube 62 movably inserted into the inner cavity of the outer tube 61, so that the buffer 6 as a whole can be extended and retracted to match the elastic deformation generated when the buffer member 5 is impacted, and the outer tube 61 has a built-in thrust spring 611, which is always in a compressed state, so that the buffer 6 as a whole is always in an extended state. An external thread 616 is provided on the outer wall of the outer tube 61, and an internal thread 54 is provided on the lower inner wall of the stepped through hole 53, and the internal thread 54 is adapted to the external thread 616, as shown in FIG. Figure 10 and Figure 9 As shown, when the outer cylinder 61 rotates, the outer cylinder 61 and the metal layer 52 can be fixedly connected together by the cooperation between the external thread 616 and the internal thread 54. The upper end of the insert 62 can be pre-welded and fixed to the buffer layer 21. Therefore, the fixed connection between the outer cylinder 61 and the metal layer 52 can compensate for the possibility of separation of the buffer member 5 and the buffer layer 21 due to insufficient bonding strength between the rubber layer 51 and the buffer layer 21.

[0042] In combination with the above, it can be seen that: this device arranges the buffer layer 21 in a wavy shape, and installs a buffer member 5 in the lower groove of the buffer layer 21, and the lower surface of the buffer member 5 protrudes below the buffer layer 21. When stones and rocks bounce up during the driving of the car, the buffer member 5 can block and buffer most of the stones and rocks, greatly reducing the impact force they generate on the buffer layer 21. In addition, a buffer 6 is installed inside the buffer member 5, and the upper end of the buffer 6 is fixedly connected to the buffer layer 21. Since the distance between two adjacent buffer members 5 is small, combined with the wavy structure of the buffer layer 21, the impact force can be further weakened, thereby improving the protection effect of the battery pack body 3.

[0043] In order to facilitate the fixed connection between the outer cylinder 61 and the metal layer 52, the present application also has a boss 612 provided at the lower end of the outer cylinder 61, and the boss 612 is truncated cone-shaped. The truncated cone-shaped boss 612 can more conveniently penetrate the inner cavity of the stepped through hole 53 from top to bottom, thereby facilitating the threaded connection between the external thread 616 and the internal thread 54. A polygonal slot 613 is provided in the middle of the boss 612. The polygonal slot 613 is a regular hexagonal groove structure, which is convenient for the staff to use an inner hexagonal wrench to screw the outer cylinder 61. An oil filling hole 614 connected to the inner cavity of the outer cylinder 61 is provided at the bottom of the polygonal slot 613, and a one-way valve 615 is installed in the inner cavity of the oil filling hole 614. The inner cavity of the outer cylinder 61 is filled with hydraulic oil. The setting of the oil filling hole 614 and the one-way valve 615 can facilitate the filling of hydraulic oil into the inner cavity of the outer cylinder 61 and avoid leakage of hydraulic oil.

[0044] In order to describe the structure of the buffer 6 in detail, the insert 62 of the present application is hollow inside and is provided with an opening at one end of the inner cavity of the outer cylinder 61. A sealing ring 63 is fixed on the outer side of one end of the insert 62 and is sealed with the inner wall of the outer cylinder 61. The setting of the sealing ring 63 is used to prevent the hydraulic oil in the inner cavity of the outer cylinder 61 from leaking from the upper end opening of the outer cylinder 61. A sealing plate 621 is fixed to the inner cavity of the open end of the insert 62, and a damping hole 622 is opened through the surface of the sealing plate 621. Figure 10 As shown, the inner cavities of the outer tube 61 and the insert tube 62 are connected only through the damping hole 622. When the buffer 6 is extended or contracted as a whole, the hydraulic oil will exchange and flow between the inner cavities of the outer tube 61 and the inner cavities of the insert tube 62. Since the damping hole 622 itself has a small inner diameter, combined with the viscosity of the hydraulic oil itself, it can produce a damping effect on the flow of the hydraulic oil, thereby ensuring that the overall extension and contraction of the buffer 6 has a damping effect, and can buffer and reduce shock to the metal layer 52.

[0045] In order to prevent the insert tube 62 and the outer tube 61 from separating from each other, the present application also has an annular platform 623 fixed concentric with the side of the sealing ring 63, one end of the thrust spring 611 presses against the side of the sealing ring 63 and is sleeved on the outside of the annular platform 623, and a sealing ring 64 is movably sleeved on the outside of the insert tube 62. The sealing ring 64 and the open end of the outer tube 61 are fixedly connected by bolts. The setting of the sealing ring 64 is used to limit the sliding of the sealing ring 63 to prevent the sealing ring 63 from sliding out from the upper end opening of the outer tube 61, thereby avoiding the possibility of separation between the insert tube 62 and the outer tube 61.

[0046] In order to suspend the protective cover 2, the present application also has strip bases 25 fixed on both sides of the protective cover 2, and a suspension shaft 23 parallel to the strip base 25 is provided on the outside of the strip base 25. The suspension shaft 23 and the strip base 25 are movably connected by a connecting arm 24. There are multiple connecting arms 24, which are evenly spaced along the length of the strip base 25. Figure 4 and Figure 7 As shown, the lower end of the connecting arm 24 is rotatably connected to the strip base 25, and the suspension shaft 23 and the connecting arm 24 remain relatively fixed. Therefore, when the connecting arm 24 rotates around its lower end, it can drive the suspension shaft 23 to move. By suspending the suspension shaft 23, this device can suspend and install the entire protective cover 2 and the battery pack body 3.

[0047] In order to suspend the suspension shaft 23, the present application also has avoidance grooves 11 on the inner walls of both sides of the chassis frame 1, and forms a suspension hook 12. The side of the suspension hook 12 fits the outer wall of the protective cover 2. The suspension shaft 23 penetrates into the inner cavity of the avoidance groove 11 from bottom to top, and the suspension shaft 23 is rotated close to the protective cover 2 and is stuck on the inner side of the suspension hook 12. The suspension shaft 23 is suspended on the suspension hook 12 by gravity. A mud guard 13 corresponding to multiple connecting arms 24 is opened on the side of the suspension hook 12. Figure 5 and Figure 7 As shown, the suspension installation process of the protective cover 2 of the present device is as follows: the protective cover 2 is placed from top to bottom in the middle of the chassis frame 1, and the suspension shaft 23 slides from bottom to top into the inner cavity of the avoidance groove 11. During this process, the suspension shaft 23 maintains a forty-five-degree tilt until the suspension shaft 23 contacts the upper inner wall of the avoidance groove 11. Then the staff pushes the connecting arm 24 upward to flip the suspension shaft 23 into the inner side of the suspension hook 12. At this time, the protective cover 2 is released. After the protective cover 2 moves slightly downward, the suspension shaft 23 can be suspended on the inner side of the suspension hook 12 under the action of the gravity of the protective cover 2.

[0048] The upper end of the tightening bolt 26 is pressed against the bottom of the recessed groove on the lower side of the suspension hook 12, and the upper end of the tightening bolt 26 is pressed against the bottom of the recessed groove on the lower side of the suspension hook 12. After the suspension shaft 23 is hung in the inner cavity of the suspension hook 12 to suspend the protective cover 2, the staff can tighten the tightening bolt 26 to press the upper end of the tightening bolt 26 against the suspension hook 12, so as to limit the position of the strip base 25 and avoid the strip base 25 and the protective cover 2 from being loosened. The protective cover plate 2 is displaced upward. In this state, the side of the protective cover plate 2 is in contact with the side of the suspension hook 12. The protective cover plate 2 is positioned in the horizontal direction by the chassis frame 1, and is positioned in the vertical direction by the cooperation of the tightening bolts 26 and the strip base 25. Therefore, the protective cover plate 2 itself can remain stable and will not shift in position. In addition, a mud guard plate 13 is fixedly connected to the lower open end of the avoidance groove 11 by bolts. The mud guard plate 13 is used to seal the inner cavity of the avoidance groove 11 to prevent dust, water, debris, etc. from entering the inner cavity of the avoidance groove 11.

[0049] In order to cool the battery pack body 3, the length and width of the buffer layer 21 of the present application are respectively smaller than the inner length and width of the protective cover 2, and the cooling pipe 22 is distributed in an "S" shape in the inner cavity of the protective cover 2. The diameter of the cooling pipe 22 is smaller than the depth of the groove on the upper side of the buffer layer 21, and the lower side of the cooling pipe 22 is padded with a flexible layer. The heat exchange baffle 4 is placed on the upper side of the buffer layer 21 and a gap is left between the cooling pipe 22, such as Figure 4 and Figure 8As shown, the cooling pipe 22 is placed in the upper groove of the buffer layer 21 to avoid being squeezed by the heat exchange partition 4. Cooling water is transported in the inner cavity of the cooling pipe 22, and the battery pack body 3 can be cooled by heat exchange through the heat exchange partition 4.

[0050] In order to prevent the battery pack body 3 from shaking, the heat exchange partition 4 of the present application divides the inner cavity of the protective cover 2 into two independent layers, and a positioning frame 41 adapted to the battery pack body 3 is fixed on the upper surface of the heat exchange partition 4. The positioning frame 41 is set to position the battery pack body 3 to prevent the battery pack body 3 from shaking in the horizontal direction.

[0051] In order to improve the cooling and heat exchange effect of the battery pack body 3, the present application also has an arc-shaped heat exchange plate 42 located in the groove on the upper side of the buffer layer 21 below the heat exchange partition 4, and the arc-shaped heat exchange plate 42 is half-covered on the outside of the cooling tube 22. The outer side of the arc-shaped heat exchange plate 42 is fixed with a plurality of heat exchange fins 43 distributed at equal intervals along its own length direction, and the heat exchange fins 43 are fixed to the lower surface of the heat exchange partition 4, and the heat exchange fins 43 are stuck in the groove on the upper side of the buffer layer 21 and adapted thereto, as shown in FIG. Figure 2 and Figure 11 As shown, the arrangement of the heat exchange fins 43 and the arc-shaped heat exchange plate 42 can increase the contact area between the heat exchange partition 4 and the cooling tube 22, thereby improving the heat exchange effect of the cooling tube 22 on the heat exchange partition 4, and ensuring that the heat exchange partition 4 can have a better heat exchange and cooling effect on the battery pack body 3.

[0052] While 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 these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A replaceable battery protection chassis for new energy vehicles, characterized by: include: A chassis frame (1), wherein a protective cover plate (2) is provided in the middle of the chassis frame (1), the protective cover plate (2) is a hollow structure with an opening at the top, and a battery pack body (3) is provided in the inner cavity of the protective cover plate (2); A buffer layer (21) is provided at the bottom of the protective cover plate (2), and the cross section of the buffer layer (21) is wavy; a heat exchange partition (4) is provided between the upper side of the buffer layer (21) and the battery pack body (3); and a cooling pipe (22) is provided in the groove on the upper side of the protective cover plate (2); A buffer member (5), wherein the buffer member (5) is adhesively fixed in the lower groove of the buffer layer (21), and the lower surface of the buffer member (5) protrudes downward to below the buffer layer (21); the buffer member (5) comprises an upper and lower layers, which are a rubber layer (51) and a metal layer (52), respectively; a stepped through hole (53) is provided through the middle of the buffer member (5); a buffer (6) is provided in the inner cavity of the stepped through hole (53); the upper end of the buffer (6) is fixedly connected to the buffer layer (21); The buffer (6) comprises an outer tube (61) and an insert tube (62) movably inserted into the inner cavity of the outer tube (61); a thrust spring (611) is built into the outer tube (61); an outer wall of the outer tube (61) is provided with an outer thread (616); an inner wall of the lower side of the stepped through hole (53) is provided with an inner thread (54), and the inner thread (54) is adapted to the outer thread (616).

2. The replaceable battery protection chassis for new energy vehicles according to claim 1 is characterized in that: A boss (612) is provided at the lower end of the outer cylinder (61), and the boss (612) is in the shape of a truncated cone. A polygonal slot (613) is provided in the middle of the boss (612). An oil filling hole (614) communicating with the inner cavity of the outer cylinder (61) is provided at the bottom of the polygonal slot (613). A one-way valve (615) is installed in the inner cavity of the oil filling hole (614). The inner cavity of the outer cylinder (61) is filled with hydraulic oil.

3. The replaceable battery protection chassis for new energy vehicles according to claim 2 is characterized in that: The insert tube (62) is hollow inside and is provided with an opening at one end of the inner cavity of the outer tube (61). A sealing ring (63) is fixedly sleeved on the outer side of one end of the insert tube (62) and is in sealing contact with the inner wall of the outer tube (61). A sealing plate (621) is fixed to the inner cavity of the open end of the insert tube (62), and a damping hole (622) is provided through the surface of the sealing plate (621).

4. The replaceable battery protection chassis for new energy vehicles according to claim 3 is characterized by: A concentric annular platform (623) is fixed to the side of the sealing ring (63); one end of the thrust spring (611) abuts against the side of the sealing ring (63) and is sleeved on the outside of the annular platform (623); a sealing ring (64) is movably sleeved on the outside of the insert cylinder (62); and the sealing ring (64) is fixedly connected to the open end of the outer cylinder (61) by bolts.

5. The replaceable battery protection chassis for new energy vehicles according to claim 1 is characterized in that: A strip base (25) is fixed to both sides of the protective cover plate (2), and a suspension shaft (23) parallel to the strip base (25) is provided on the outer side of the strip base (25). The suspension shaft (23) and the strip base (25) are movably connected via a connecting arm (24), and a plurality of connecting arms (24) are provided and are evenly spaced along the length direction of the strip base (25).

6. The replaceable battery protection chassis for new energy vehicles according to claim 5, characterized in that: The inner walls on both sides of the chassis frame (1) are provided with avoidance grooves (11) and form suspension hooks (12). The sides of the suspension hooks (12) are in contact with the outer side walls of the protective cover plate (2). The suspension shaft (23) penetrates into the inner cavity of the avoidance groove (11) from bottom to top, and the suspension shaft (23) is rotated close to the protective cover plate (2) and is stuck on the inner side of the suspension hook (12). The suspension shaft (23) is suspended on the suspension hook (12) by gravity. The side of the suspension hook (12) is provided with a fender guard (13) corresponding to a plurality of connecting arms (24).

7. The replaceable battery protection chassis for new energy vehicles according to claim 6, characterized in that: The lower side of the suspension hook (12) is provided with a recessed groove corresponding to the strip base (25); a tightening bolt (26) is provided through a thread in the middle of the strip base (25); the upper end of the tightening bolt (26) abuts against the bottom of the recessed groove on the lower side of the suspension hook (12); and the lower open end of the avoidance groove (11) is fixedly connected to a fender guard (13) by a bolt.

8. The replaceable battery protection chassis for new energy vehicles according to claim 1, characterized in that: The length and width of the buffer layer (21) are respectively smaller than the inner length and width of the protective cover plate (2); the cooling pipe (22) is distributed in an "S" shape in the inner cavity of the protective cover plate (2); the diameter of the cooling pipe (22) is smaller than the depth of the groove on the upper side of the buffer layer (21); and a flexible layer is padded on the lower side of the cooling pipe (22); the heat exchange baffle (4) is placed on the upper side of the buffer layer (21) and a gap is left between the cooling pipe (22).

9. The replaceable battery protection chassis for new energy vehicles according to claim 8, characterized in that: The heat exchange baffle (4) separates the inner cavity of the protective cover plate (2) into two independent upper and lower layers, and a positioning frame (41) adapted to the battery pack body (3) is fixed on the upper surface of the heat exchange baffle (4).

10. The replaceable battery protection chassis for new energy vehicles according to claim 9, characterized in that: An arc-shaped heat exchange plate (42) is provided below the heat exchange baffle (4) and is located in the groove on the upper side of the buffer layer (21), and the arc-shaped heat exchange plate (42) is half-covered on the outside of the cooling tube (22). A plurality of heat exchange fins (43) distributed at equal intervals are fixed to the outside of the arc-shaped heat exchange plate (42) along its own length direction, and the heat exchange fins (43) are fixed to the lower surface of the heat exchange baffle (4), and the heat exchange fins (43) are stuck in the groove on the upper side of the buffer layer (21) and are adapted thereto.

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