An expandable tube type water tank applied to an electric vehicle

Abstract

This invention relates to an expansion-tube type water tank for electric vehicles, and pertains to the field of expansion-tube type water tank technology. It includes a tank body with multiple expansion tubes inside. The baffle plate has a polygonal cross-section. A connecting component is installed within the positioning bracket and mounting base. A movable seat is slidably connected to one side of the push frame, and a sliding rod is slidably connected within the movable seat. A buffer component is installed on one side of the slide rail. This invention employs a sloped linkage design of the push plate, movable column, push frame, and movable seat, transforming the downward pressing action of the tank body into a continuous action of automatic locking and buffer unlocking. This achieves rapid, press-type assembly, eliminating the need for repeated hole alignment during assembly. The sliding locking structure allows for slight displacement of the water tank within the locking range, compensating for thermal expansion and contraction deformation of the tank body caused by coolant temperature changes, and offsetting machining errors in the hole positions during vehicle assembly, avoiding additional stress caused by forced alignment under rigid connections.

Description

Technical Field

[0001] This invention relates to the field of expansion tube water tank technology, specifically an expansion tube water tank for use in electric vehicles. Background Technology

[0002] Although electric vehicles do not have internal combustion engines, their three-electric systems (battery, motor, and electronic control) have extremely high requirements for temperature control accuracy. Modern electric vehicles generally use multi-circuit liquid cooling systems, which has led to the development of expansion tanks from traditional single-circuit systems to multi-chamber independent expansion tanks. This places higher demands on structural sealing, space utilization, and lightweighting. The tube expansion process is a technology that uses mechanical and hydraulic expansion to plastically deform the tube and achieve a tight fit with the end plate and partition. The tube expansion process achieves sealed separation of multiple chambers in a single tank.

[0003] However, while existing electric vehicles lack the low-frequency, large-amplitude vibrations of internal combustion engines, their electric drive systems generate high-frequency, small-amplitude vibrations during operation. Additionally, road bumps, rapid acceleration, and braking during vehicle operation cause impact vibrations. These vibrations are directly transmitted through the vehicle body to the expansion-tube radiator connection. Currently, most electric vehicles and expansion-tube radiators are rigidly connected, preventing vibration energy attenuation and causing continuous impact on weak points. Under rigid connections, continuous vibration can lead to fatigue cracks at the expansion joint, resulting in coolant leakage. Furthermore, the dimensions of the front compartment and the location of mounting holes vary between different vehicle models. Traditional fixed-hole radiator connections cannot accommodate multiple models, requiring separate mold design for each model, which is costly and time-consuming. Vibrations during vehicle operation also cause slight displacement of the expansion-tube radiator. The rigid connection between the electric vehicle and the expansion-tube radiator forces the radiator into alignment, causing additional stress on the radiator shell and expansion tube interface.

[0004] To address the aforementioned issues, there is an urgent need for innovative designs based on the existing expansion-tube water tanks used in electric vehicles. Summary of the Invention

[0005] The present invention addresses the problem that existing technical solutions are too simplistic by providing a solution that is significantly different from existing technologies. Specifically, the purpose of the present invention is to provide an expansion-tube type water tank for electric vehicles to solve the problems mentioned in the background.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an expansion-tube type water tank for electric vehicles, comprising a tank body, wherein multiple expansion tubes are provided inside the tank body, and each expansion tube is provided with a baffle plate for preventing coolant from directly impacting the tube wall. The baffle plate has a zigzag cross-section. Positioning brackets are fixed on both sides of the tank body, and a mounting seat is provided on the top of the positioning bracket. The mounting seat is fixedly connected to the vehicle body. A connecting component is provided inside the positioning bracket and the mounting seat, and the tank body and the vehicle body are slidably locked together by the connecting component. Pushing frames are provided on both sides of the connecting component, and a spring is provided between the inner wall of the pushing frame and the positioning bracket. A movable seat is slidably connected to one side of the pushing frame, and a sliding rod is slidably connected inside the movable seat. A slide rail is slidably connected to the outer wall of the sliding rod. A buffer component is provided on one side of the slide rail, and the buffer component prevents the tank body from being impacted and vibrated by the vehicle body. A connecting piece is rotatably connected to one side of the buffer component, and the connecting piece is slidably connected to the mounting seat.

[0007] Preferably, the movable seat is composed of two cubes and a connecting frame, the cross-section of the sliding rod is "J" shaped, and the bottom end of the "J" shape of the sliding rod and the cube of the movable seat form a locking engagement.

[0008] Preferably, the contact surfaces of one of the cubes of the push frame and the movable seat are both inclined surfaces, the slide rail has a cavity that allows the push frame, the movable seat and the sliding rod to move, and a spring is provided between the movable seat and the slide rail.

[0009] Preferably, the connecting component includes a positioning frame disposed at the top of the mounting base, a connecting column disposed at the bottom of the positioning frame, a movable column slidably connected inside the connecting column, a push plate slidably connected to the movable column, a fixing plate disposed inside the movable column, a locking element movably connected to one end of the fixing plate, the connecting column being located at the bottom of the positioning bracket, and the movable column penetrating through the positioning bracket.

[0010] Preferably, both the connecting column and the moving column have cavities that cooperate with the locking member, and the locking member is fixedly connected to the inner wall of the cavity of the connecting column through a connecting shaft.

[0011] Preferably, the push plate passes through the moving column, and the contact surfaces of the push plate and the moving column are both inclined surfaces, and the push plate is slidably connected to the positioning bracket.

[0012] Preferably, the connecting column has a cavity that moves in conjunction with the movable column, and a spring is installed inside the cavity.

[0013] Preferably, the buffer assembly includes a sliding member rotatably connected to the connector, a sliding rod rotatably connected inside the sliding member, a rotating member fixed to one end of the sliding rod, one side of the rotating member being fixedly connected to the sliding rod, and bases rotatably connected to both sides of the rotating member.

[0014] Preferably, the sliding member has a cavity that moves in conjunction with the sliding rod, and a torsion spring is fitted on the outer wall of the sliding rod. One end of the torsion spring is fixedly connected to the inner wall of the cavity, and the other end of the torsion spring is fixedly connected to one end of the sliding rod.

[0015] Preferably, the base is rotatably connected to the protruding part of the inner wall of the positioning bracket, and a spring is provided between the two bases.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention adopts a sloped linkage design of push plate, moving column, push frame, and moving seat, which transforms the downward pressing action of the tank body into a continuous action of automatic locking and buffer unlocking, realizing press-type rapid assembly without the need for additional tools. The assembly process does not require repeated correction of hole positions, which greatly shortens the assembly time, improves assembly efficiency, reduces the difficulty of manual operation and production costs. After locking, the connecting column and locking part can slide within the positioning frame, which can be compatible with the differences in the space size and installation hole positions of the front compartment of different vehicle models, greatly reducing the cost and cycle of mold development, improving the product's universality, and adapting to the platform production needs of the whole vehicle. The sliding locking structure allows the water tank to move slightly within the locking range, which can compensate for the thermal expansion and contraction deformation of the tank body caused by the temperature change of the coolant, and also offset the hole position machining errors of the whole vehicle assembly, avoiding the additional stress generated by forced alignment under rigid connection, preventing water tank shell deformation and expansion pipe interface cracking, and extending the overall service life of the water tank.

[0017] 2. When the present invention is not installed, the rotating parts are locked by the cooperation of the push frame, the moving seat and the sliding rod, so that the buffer assembly is in a locked state and each part maintains a relatively fixed initial position. This avoids structural damage such as spring deformation and wear of connecting parts caused by violent shaking during transportation or handling, and ensures that the performance of the buffer assembly does not degrade at the factory. After installation, the buffer assembly is automatically unlocked and the elastic buffer function is restored, taking into account transportation safety, assembly accuracy and reliability of use.

[0018] 3. After the buffer assembly of this invention is unlocked, the torsion spring and the spring between the base form a dual elastic buffer mechanism, which respectively offsets the horizontal braking inertial force and the multi-angle shaking impact, converting the vibration kinetic energy into elastic potential energy, avoiding rigid collision between the tank body and the mounting base. At the same time, the buffer structure effectively blocks the transmission of vibration to weak parts such as the expansion joint and pipe joint, significantly reducing the incidence of fatigue cracks at the expansion joint and the risk of coolant leakage, improving the sealing reliability and safety of the water tank. The baffle inside the expansion joint prevents the liquid from directly impacting the inner wall of the water tank, improving the service life of the water tank. Attached Figure Description Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a structural schematic diagram showing the connection between the positioning bracket and the mounting base of the present invention; Figure 3 This is a schematic diagram of the internal structure of the positioning bracket of the present invention; Figure 4 For the present invention Figure 3 Enlarged view of the structure at point A; Figure 5 This is a structural schematic diagram showing the connection between the push plate and the moving column of the present invention; Figure 6 This is a three-dimensional structural diagram of the connecting component of the present invention; Figure 7 This is a three-dimensional structural schematic side sectional view of the connecting component of the present invention; Figure 8 This is a structural schematic diagram showing the connection between the push plate and the push frame of the present invention; Figure 9 This is a three-dimensional structural diagram of the buffer component of the present invention; Figure 10 This is a three-dimensional structural schematic diagram of the buffer component of the present invention; Figure 11 This is a structural schematic diagram showing the connection between the slide rail and the sliding rod of the present invention; Figure 12 This is a structural schematic diagram showing the connection between the push frame and the movable seat of the present invention; Figure 13 This is a three-dimensional structural diagram of the movable base and sliding rod in the locked state of the present invention; Figure 14 This is a structural schematic diagram showing the connection between the expansion joint and the baffle plate of the present invention; Figure 15 This is a structural schematic diagram showing the connection between the positioning bracket and the connecting column of the present invention. In the diagram: 1. Box body; 2. Expansion joint; 3. Baffle plate; 4. Positioning bracket; 5. Mounting base; 601. Positioning frame; 602. Connecting column; 603. Push plate; 604. Moving column; 605. Fixing plate; 606. Locking component; 7. Push frame; 8. Moving base; 9. Slide rail; 10. Sliding rod; 11. Connecting component; 121. Sliding component; 122. Sliding rod; 123. Torsion spring; 124. Rotating component; 125. Base. Detailed Implementation

[0019] To further illustrate the technical means and effects adopted by the present invention in order to achieve the intended purpose, the following detailed description is provided in conjunction with the accompanying drawings and preferred embodiments, based on the specific implementation methods, structures, features and effects of the present invention.

[0020] Please see Figures 1 to 14 This invention provides a technical solution: an expansion tube type water tank for electric vehicles, comprising a tank body 1, with multiple expansion tubes 2 inside the tank body 1, each expansion tube 2 having a baffle plate 3 for preventing coolant from directly impacting the tube wall of the expansion tube 2, the baffle plate 3 having a zigzag cross-section, positioning brackets 4 fixed on both sides of the tank body 1, mounting seats 5 on the top of the positioning brackets 4, the mounting seats 5 being fixedly connected to the vehicle body, connecting components inside the positioning brackets 4 and the mounting seats 5, and the tank body 1 being slidably locked to the vehicle body through the connecting components, push frames 7 on both sides of the connecting components, springs between the push frames 7 and the inner walls of the positioning brackets 4, a movable seat 8 slidably connected to one side of the push frame 7, a sliding rod 10 slidably connected inside the movable seat 8, a slide rail 9 slidably connected to the outer wall of the sliding rod 10, a buffer component on one side of the slide rail 9, and the buffer component preventing the tank body 1 from being impacted and vibrated by the vehicle body, a connecting piece 11 rotatably connected to one side of the buffer component, the connecting piece 11 being limited and slidably connected to the mounting seat 5.

[0021] In specific implementation, the housing body 1 is slidably locked to the car body through the connecting components in the positioning bracket 4 and the mounting base 5. The push frame 7 on both sides of the connecting component slides and the moving base 8. The moving base 8 is linked with the sliding rod 10 in the slide rail 9. The zigzag baffle 3 in the expansion pipe 2 inside the housing body 1 can prevent the coolant from directly hitting the pipe wall. The buffer component on one side of the slide rail 9 is limited and slidably connected to the mounting base 5 through the connector 11, which can buffer the impact vibration brought by the car body. The spring between the push frame 7 and the inner wall of the positioning bracket 4 helps to reset and stabilize the relevant components.

[0022] As a further embodiment of the present invention, the movable seat 8 is composed of two cubes and a connecting frame, and the cross-section of the sliding rod 10 is "J" shaped, with the bottom end of the "J" shape of the sliding rod 10 and the cube of the movable seat 8 forming a locking engagement.

[0023] In specific implementation, the movable seat 8, which consists of two cubes and a connecting frame, forms a locking engagement with the bottom end of the sliding rod 10, which has a "J" shaped cross-section, through its cube structure, thereby achieving a locking fit between the movable seat 8 and the sliding rod 10.

[0024] As a further embodiment of the present invention, the contact surfaces of one of the cubes of the push frame 7 and the movable seat 8 are both inclined surfaces, the slide rail 9 has a cavity that cooperates with the push frame 7, the movable seat 8 and the sliding rod 10, and a spring is provided between the movable seat 8 and the slide rail 9.

[0025] In practice, the push frame 7, whose contact surface is inclined, cooperates with one of the cubes of the movable seat 8 and moves within the cavity provided by the slide rail 9 to accommodate the movement of the push frame 7, the movable seat 8, and the sliding rod 10. The spring between the movable seat 8 and the slide rail 9 can undergo elastic deformation when the components move, thereby achieving reset and buffering, and thus cooperating to complete the locking or unlocking action.

[0026] As a further embodiment of the present invention, the connecting component includes a positioning frame 601 disposed at the top of the mounting base 5, a connecting post 602 disposed at the bottom of the positioning frame 601, a movable post 604 slidably connected inside the connecting post 602, a push plate 603 slidably connected to the movable post 604, a fixing plate 605 disposed inside the movable post 604, a locking member 606 movably connected to one end of the fixing plate 605, the connecting post 602 being located at the bottom of the positioning bracket 4, and the movable post 604 penetrating through the positioning bracket 4.

[0027] In specific implementation, the connecting column 602 at the bottom of the positioning bracket 4 is adapted to the positioning frame 601 at the top of the mounting base 5. The movable column 604 passing through the positioning bracket 4 is slidably connected to the push plate 603. The movement of the push plate 603 can drive the movable column 604 to slide in the connecting column 602, thereby pushing the fixed plate 605 in the movable column 604 to move. The fixed plate 605 drives the locking member 606 to complete the locking or unlocking with the positioning frame 601, realizing the sliding locking connection between the box body 1 and the mounting base 5.

[0028] As a further embodiment of the present invention, both the connecting column 602 and the moving column 604 have cavities that cooperate with the locking member 606. The locking member 606 is fixedly connected to the inner wall of the cavity of the connecting column 602 through a connecting shaft.

[0029] In practice, both the connecting column 602 and the moving column 604 have cavities adapted to the movement of the locking member 606. The locking member 606 is fixedly connected to the inner wall of the cavity of the connecting column 602 through the connecting shaft, thereby providing a stable rotation fulcrum for the locking member 606, and cooperating with the sliding action of the moving column 604 to realize the locking or unlocking function.

[0030] As a further embodiment of the present invention, the push plate 603 penetrates the moving column 604, and the contact surfaces of the push plate 603 and the moving column 604 are both inclined surfaces, and the push plate 603 is slidably connected to the positioning bracket 4.

[0031] In practice, the push plate 603, which is slidably connected to the positioning bracket 4, passes through the moving column 604, and the contact surface between the two is an inclined plane. When the push plate 603 slides along the positioning bracket 4, the horizontal sliding can be converted into the vertical movement of the moving column 604 by means of the inclined plane, which provides power for the subsequent driving of the locking member 606.

[0032] As a further embodiment of the present invention, the connecting column 602 has a cavity that moves in conjunction with the movable column 604, and a spring is provided inside the cavity.

[0033] In specific implementation, the connecting post 602 has a cavity inside that is adapted to the movement of the moving post 604. The spring in the cavity can be compressed or reset as the moving post 604 slides, providing elastic driving force for the return of the moving post 604 and ensuring that the locking member 606 completes the reset action after unlocking.

[0034] As a further embodiment of the present invention, the buffer assembly includes a sliding member 121 rotatably connected to the connecting member 11, a sliding rod 122 slidably connected inside the sliding member 121, a rotating member 124 fixed at one end of the sliding rod 122, a side of the rotating member 124 fixedly connected to the sliding rod 10, and bases 125 rotatably connected to both sides of the rotating member 124.

[0035] In specific implementation, the sliding member 121, which is rotatably connected to the connecting member 11, can slide along the sliding rod 122. The rotating member 124, which is fixed at one end of the sliding rod 122, is connected to the sliding rod 10 and is rotatably connected to the base 125 on both sides. Through the sliding of the sliding member 121 and the linkage of the rotating member 124, the vibration of the box body 1 is buffered in conjunction with the subsequent elastic components.

[0036] As a further embodiment of the present invention, the sliding member 121 has a cavity that moves in conjunction with the sliding rod 122, and a torsion spring 123 is sleeved on the outer wall of the sliding rod 122. One end of the torsion spring 123 is fixedly connected to the inner wall of the cavity, and the other end of the torsion spring 123 is fixedly connected to one end of the sliding rod 122.

[0037] In practice, when the sliding member 121 slides relative to the sliding rod 122 under external force, the torsion spring 123 will be compressed or reset, converting the impact kinetic energy into elastic potential energy, and providing elastic support for buffering vibration.

[0038] As a further embodiment of the present invention, the base 125 is rotatably connected to the protruding part of the inner wall of the positioning bracket 4, and a spring is provided between the two bases 125.

[0039] In practice, when the rotating component 124 drives the base 125 to rotate, the springs between the bases 125 will be compressed or stretched accordingly, and the elastic deformation will help to offset the vibration impact and improve the buffering effect.

[0040] Working Principle: When using this expansion-tube type water tank for electric vehicles, move the tank body 1 to the top of the mounting base 5, align the connector 11 with the protruding position of the mounting base 5, and press the tank body 1 so that the connector 11 slides at the protruding position of the mounting base 5. The connecting column 602 located at the bottom of the positioning bracket 4 moves into the mounting base 5 along with the tank body 1 until the connecting column 602 abuts against the mounting base 5. As the positioning bracket 4 moves, its slidingly connected push plate 603 will contact the protruding position on the side of the mounting base 5 and move into the positioning bracket 4. Since the contact surface between the push plate 603 and the moving column 604 is inclined, the horizontal movement of the push plate 603 drives the moving column 604 to move vertically. The movement of the moving column 604 causes it to move within the cavity opened in the connecting column 602. (When the moving column 604 moves within the connecting column 602, the spring between the two is compressed, and the spring releases the elasticity.) The force drives the moving column 604 to reset, and simultaneously drives the fixed plate 605 inside it to move. Since the locking part 606 is rotatably connected to the connecting column 602 through the connecting shaft, both the connecting column 602 and the moving column 604 have cavities that cooperate with the movement of the locking part 606. This allows the locking part 606 to be rotated by the fixed plate 605, thereby locking the locking part 606 to the positioning frame 601 at the top of the mounting base 5. After locking, the connecting column 602 and the locking part 606 can slide in the positioning frame 601, achieving the effect of sliding locking connection between the box body 1 and the car body. The sliding structure can realize the fine adjustment of the installation position and adapt to the space constraints of different car models. When the water tank is working, the temperature change of the coolant will cause the shell to expand and contract thermally. The vibration during vehicle driving will also cause a small displacement. The sliding locking connection allows the water tank to move freely within a certain range. After locking, it can limit excessive shaking and balance the contradiction between displacement compensation and connection stability. When the push plate 603 moves, it drives the push frames 7 fixed on both sides to move synchronously. Since the contact surfaces of the cubes that the push frames 7 and the moving seat 8 contact are both inclined, the horizontal movement of the push frames 7 drives the moving seat 8 to move vertically. The movement of the moving seat 8 within the cavity of the slide rail 9 causes the other cube to release the lock at the bottom of the "J"-shaped sliding rod 10. (The movement of the moving seat 8 compresses the spring between the moving seat 8 and the slide rail 9. The spring force released by the spring drives the moving seat 8 to reset, realizing the engagement of the moving seat 8 and the sliding rod 10, achieving the goal of not installing the box body 1.) When the operation of the locking buffer assembly is activated, the sliding rod 10 can slide freely within the slide rail 9, thereby allowing the rotating part 124 fixed to the sliding rod 10 to move freely. When the position of the rotating part 124 is locked, the housing body 1 will not shake or misalign due to the elastic displacement of the buffer component when placed on the mounting base 5, thus preventing the connection part 11 from being difficult to align precisely with the mounting base 5. Furthermore, in the locked state, the degree of freedom of movement of the sliding rod 122 is restricted, and each component maintains a relatively fixed initial position, avoiding structural damage caused by violent shaking during transportation or handling, and ensuring that the performance of the buffer assembly does not degrade at the factory. After installation, the locking state of the buffer assembly is released. In the event of sudden braking by a tram, the impact force generated by the inertia of the tank body 1 will push the connecting piece 11, causing the sliding piece 121 to move. Since the sliding piece 121 is slidably connected to the sliding rod 122, and the sliding rod 122 is fitted with a torsion spring 123, the movement of the sliding piece 121 compresses the torsion spring 123, causing the sliding rod 122 to move within the sliding piece 121. When the sliding piece 121 moves, it will cause the bases 125, which are rotatably connected to both sides, to rotate. The rotation of the bases 125 will compress or stretch the spring between them. Through the synchronous deformation of the torsion spring 123 and the spring, the impact kinetic energy is converted into elastic potential energy, directly offsetting the rigid collision between the tank body 1 and the mounting base 5. This prevents the impact force from being transmitted to weak points such as the expansion joints and pipe connections of the water tank, preventing cracking and leakage at the expansion joints. The torsion spring 123... The main function is to buffer the inertial force of sudden braking in the horizontal direction. The springs between the bases 125 can compensate for the swaying impact at multiple angles, forming a linkage mechanism of two-way elastic buffering. This significantly reduces the fatigue damage rate of the main body 1 and the connecting parts 11, extending the overall service life. In addition, when the tram brakes suddenly, the coolant in the expansion pipe 2 will impact the internally fixed baffle 3, effectively reducing the impact load of the liquid on the inner wall of the water tank, and significantly improving the structural stability and durability.

[0041] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. An expansion-tube type water tank for electric vehicles, comprising a tank body (1), characterized in that: The housing body (1) is equipped with multiple expansion joints (2) inside. Each expansion joint (2) is equipped with a baffle plate (3) to prevent coolant from directly impacting the wall of the expansion joint (2). The baffle plate (3) has a zigzag cross-section. Positioning brackets (4) are fixed on both sides of the housing body (1). A mounting seat (5) is provided on the top of the positioning bracket (4). The mounting seat (5) is fixedly connected to the vehicle body. A connecting component is provided inside the positioning bracket (4) and the mounting seat (5). The housing body (1) and the vehicle body are slidably locked together by the connecting component. Pushing frames (7) are provided on both sides of the connecting component. A spring is provided between the inner wall of the pushing frame (7) and the positioning bracket (4). A movable seat (8) is slidably connected to one side of the pushing frame (7). A sliding rod (10) is slidably connected inside the movable seat (8). A slide rail (9) is slidably connected to the outer wall of the sliding rod (10). A buffer component is provided on one side of the slide rail (9). The buffer component is used to prevent the box body (1) from being subjected to impact vibration from the car body. A connecting piece (11) is rotatably connected to one side of the buffer component. The connecting piece (11) is slidably connected to the mounting base (5).

2. The expansion-tube type water tank for electric vehicles according to claim 1, characterized in that: The movable seat (8) consists of two cubes and a connecting frame. The cross-section of the sliding rod (10) is "J" shaped. The bottom end of the "J" shape of the sliding rod (10) and the cube of the movable seat (8) form a locking engagement.

3. The expansion-tube type water tank for electric vehicles according to claim 1, characterized in that: The contact surfaces of one of the cubes of the push frame (7) and the movable seat (8) are both inclined surfaces. The slide rail (9) has a cavity that allows the push frame (7), the movable seat (8) and the sliding rod (10) to move. A spring is provided between the movable seat (8) and the slide rail (9).

4. The expansion-tube type water tank for electric vehicles according to claim 1, characterized in that: The connecting component includes a positioning frame (601) disposed at the top of the mounting base (5), a connecting post (602) disposed at the bottom of the positioning frame (601), a movable post (604) slidably connected inside the connecting post (602), a push plate (603) slidably connected to the movable post (604), a fixing plate (605) disposed inside the movable post (604), a locking element (606) movably connected to one end of the fixing plate (605), the connecting post (602) being located at the bottom of the positioning bracket (4), and the movable post (604) penetrating the positioning bracket (4).

5. The expansion-tube type water tank for electric vehicles according to claim 4, characterized in that: Both the connecting column (602) and the moving column (604) have cavities that cooperate with the locking member (606) to move. The locking member (606) is fixedly connected to the inner wall of the cavity of the connecting column (602) through a connecting shaft.

6. The expansion-tube type water tank for electric vehicles according to claim 4, characterized in that: The push plate (603) penetrates the moving column (604), and the contact surfaces of the push plate (603) and the moving column (604) are both inclined surfaces. The push plate (603) is slidably connected to the positioning bracket (4).

7. The expansion-tube type water tank for electric vehicles according to claim 4, characterized in that: The connecting column (602) has a cavity that moves in conjunction with the movable column (604), and a spring is provided inside the cavity.

8. The expansion-tube type water tank for electric vehicles according to claim 1, characterized in that: The buffer assembly includes a sliding member (121) rotatably connected to the connector (11), a sliding rod (122) slidably connected inside the sliding member (121), a rotating member (124) fixed at one end of the sliding rod (122), a rotating member (124) fixedly connected to one side of the rotating member (124) and a base (125) rotatably connected to both sides of the rotating member (124).

9. A tubular water tank for electric vehicles according to claim 8, characterized in that: The sliding member (121) has a cavity that moves in conjunction with the sliding rod (122). A torsion spring (123) is fitted on the outer wall of the sliding rod (122). One end of the torsion spring (123) is fixedly connected to the inner wall of the cavity, and the other end of the torsion spring (123) is fixedly connected to one end of the sliding rod (122).

10. A tubular water tank for electric vehicles according to claim 8, characterized in that: The base (125) is rotatably connected to the protruding part of the inner wall of the positioning bracket (4), and a spring is provided between the two bases (125).

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