Cylindrical battery module for electric bicycle

Abstract

The invention relates to the technical field of power batteries, in particular to a cylindrical battery module for an electric bicycle. Comprising a plurality of shells, air inlet pipes are concentrically and fixedly communicated with the lower ends of the shells, cover bodies are fixed to the upper ends of the shells, air outlet pipes communicated with the shells are concentrically and fixedly arranged on the cover bodies, cylindrical batteries are concentrically and fixedly arranged in the shells, and sliding groove sets are formed in the two sides of the inner walls of the shells and comprise two vertical long circular grooves; chain wheels are rotationally arranged in the upper end and the lower end of the long circular groove, the upper chain wheel and the lower chain wheel in the long circular groove are in transmission connection through a chain, a driving assembly is arranged in the air inlet pipe and is in transmission connection with the chain wheel in the lower end of the long circular groove, and a long circular wiping ring is arranged in the shell and is driven by the chain wheels. According to the invention, the problems of low heat dissipation efficiency, poor environmental adaptability and high maintenance cost of the battery module of the electric bicycle are solved, and a systematic solution is provided for long-acting stable operation of a high-density power battery.

Description

Technical Field

[0001] The present invention relates to the technical field of power batteries, and particularly to a cylindrical battery module for an electric bicycle. Background Art

[0002] With the rapid development of the electric bicycle market, cylindrical lithium batteries have gradually become one of the core components of the power system for two-wheeled electric vehicles due to their high energy density and advantages in standardized production. During the operation of the vehicle, continuous charging and discharging of the battery will generate a large amount of heat. If the heat dissipation efficiency is insufficient, it is easy to cause uneven temperature of the battery cells, performance degradation, and even the risk of thermal runaway. Traditional cylindrical battery modules mostly adopt passive air cooling or liquid cooling solutions, but there are significant limitations in actual applications: Contradiction between space and energy efficiency: Electric bicycles are extremely sensitive to the volume and weight of the battery module. The traditional liquid cooling system is difficult to adapt to the requirements of compact design due to its complex pipeline and large weight; while passive air cooling relies on natural convection, with low heat dissipation efficiency and difficulty in coping with high-rate discharge conditions.

[0003] Insufficient heat dissipation uniformity: The contact area between the surface of the cylindrical battery and the heat dissipation medium is limited. When the air flow directly passes through the battery gaps, it is easy to form a "short-circuit effect", and the problem of heat accumulation in local areas is prominent.

[0004] Poor environmental adaptability: In a humid or dusty environment, impurities or unevenly distributed condensate water films are likely to adhere to the battery surface, further hindering heat exchange, and the lack of a self-cleaning mechanism may lead to long-term performance degradation.

[0005] In the prior art, although there have been attempts to optimize heat dissipation through forced air flow or phase change materials, there are still problems such as structural redundancy, high energy consumption, or high maintenance costs. Therefore, there is an urgent need for a lightweight, self-driven solution that can achieve efficient thermal management of the battery surface to meet the requirements of high-reliability and long-life power battery modules for electric bicycles. Summary of the Invention

[0006] The main purpose of the present invention is to provide a cylindrical battery module for an electric bicycle that can effectively cool the battery.

[0007] To achieve the above purpose, the technical solution provided by the present invention is: A cylindrical battery module for an electric bicycle, comprising a plurality of shells. A gas inlet pipe is concentrically and fixedly connected to the lower end of the shell. The gas inlet pipe is communicated with a main gas inlet pipe through a lower manifold. A cover body is fixedly arranged at the upper end of the shell. An air outlet pipe concentric with the shell is fixedly arranged on the cover body. A cylindrical battery is concentrically and fixedly arranged inside the shell. The pole column of the cylindrical battery penetrates through the cover body. Slideway groups are arranged on both sides of the inner wall of the shell. The two slideway groups are symmetrically arranged. Each slideway group comprises two vertical oval slots. Sprockets are rotatably arranged at both the upper and lower ends of the oval slot. The upper and lower sprockets in the oval slot are connected by a chain. A driving assembly is arranged in the gas inlet pipe. The output end of the driving assembly is located outside the gas inlet pipe and is in transmission connection with the sprocket in the lower end of the oval slot. A wiping ring in the shape of an oval ring is arranged inside the shell. Two connecting columns are fixedly arranged at both ends of the wiping ring. The connecting column is rotatably connected to the chain on one side thereof through an ear plate. The connecting column and the sprocket are arranged at intervals. During the process that the chain drives the wiping ring to move in the vertical direction, the inner edge of the arc part at one end of the wiping ring contacts the outer edge of one side of the cylindrical battery. During the process that the chain drives the connecting column to cross its arc part, the wiping ring can move in the horizontal direction. During the process that the chain drives the connecting column to cross its arc part and then continues to move in the vertical direction, the inner edge of the arc part at the other end of the wiping ring contacts the outer edge of the other side of the cylindrical battery. After the sprocket drives the wiping ring to reciprocate up and down, the inner edges of the arc parts at both ends of the wiping ring can wipe the outer edge of the cylindrical battery as a whole.

[0008] Specifically, the air outlet pipe is communicated with a main air outlet pipe through an upper manifold.

[0009] Specifically, the plurality of shells are arranged in a rectangular array.

[0010] Specifically, the driving assembly comprises a driving shaft concentric with the gas inlet pipe. The driving shaft is rotatably arranged in the gas inlet pipe. A fan blade is concentrically and fixedly arranged at the lower end of the driving shaft. A first bevel gear is concentrically and fixedly arranged at the upper end of the driving shaft. A transmission shaft is rotatably and sealingly connected to both sides of the gas inlet pipe. The two transmission shafts are arranged corresponding to the two slideway groups up and down. One end of the transmission shaft is located inside the gas inlet pipe, and the other end of the transmission shaft is located outside the gas inlet pipe. A second bevel gear is concentrically and fixedly arranged at one end of the transmission shaft inside the gas inlet pipe. The first bevel gear meshes with the second bevel gear. Two first belt pulleys are concentrically and fixedly arranged at one end of the transmission shaft outside the gas inlet pipe. The sprocket shaft at the lower end of the oval slot extends to the outside of the shell. The sprocket shaft at the lower end of the oval slot is rotatably and sealingly connected to the shell. Second belt pulleys are concentrically and fixedly arranged on the sprocket shafts located outside the shell. The two second belt pulleys on the same side and the two first belt pulleys are respectively connected by two belts in transmission.

[0011] Specifically, the two second belt pulleys, the two first belt pulleys and the two belts on the same side are located inside a protective shell. The protective shell is fixedly connected to the shell.

[0012] Specifically, an upper mounting seat is fixed to the lower end of the cover body, a lower mounting seat is fixed inside the lower end of the housing, the cylindrical battery is fixed inside the upper mounting seat, the lower end of the cylindrical battery is fixed inside the lower mounting seat, the pole column penetrates through the upper mounting seat and is hermetically sealed inside the upper mounting seat, and the wiping ring contacts the upper end of the lower mounting seat after moving to the lower dead center, and the wiping ring contacts the upper end of the upper mounting seat after moving to the upper dead center.

[0013] Specifically, sponge layers are fixed to the inner edges of the two arc-shaped portions of the wiping ring.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. By introducing a compressed air flow containing moisture and combining with the reciprocating movement of the wiping ring, a water film is evenly coated on the outer edge of the cylindrical battery. Utilizing the principle of heat absorption by evaporation, the heat dissipation efficiency is significantly improved. The wiping ring is internally provided with a sponge layer, and during the up and down movement, dust or condensate residues on the surface of the cylindrical battery are synchronously removed, realizing the dual functions of heat dissipation and self-cleaning, and avoiding the local thermal resistance problem caused by the accumulation of impurities.

[0015] 2. The driving component is completely driven by the air flow power, without the need for an external power supply or a complex control module, meeting the lightweight and energy-saving requirements of electric bicycles. The sprocket and chain drive system converts the air flow energy into the reciprocating movement of the wiping ring efficiently through the linkage in the horizontal and vertical directions, realizing the closed-loop utilization of energy. The wiping ring alternately contacts the outer edges on both sides of the battery, ensuring that the water film coverage area reaches 100%, and avoiding the heat dissipation blind area caused by "air flow short circuit" in traditional air cooling.

[0016] 3. The rectangular array layout of the housing and the centralized gas path design of the header pipe greatly save space and are suitable for the narrow battery compartment of electric bicycles. The protective shell seals the transmission components, preventing dust and water vapor from invading, prolonging the service life of the mechanical system. The upper mounting seat isolates the erosion of moisture on the electrodes, improving the environmental tolerance.

[0017] 4. By controlling the moving path of the wiping ring, the inner edges of the arc-shaped portions of the wiping ring alternately contact the outer edge portions on the left and right sides of the cylindrical battery, so that the side of the wiping ring in contact with the cylindrical battery coats the water film on the outer edge portion of the cylindrical battery, while the side of the wiping ring not in contact with the outer edge of the cylindrical battery is cooled by the compressed air containing water vapor, avoiding damage caused by overheating due to the wiping ring contacting the cylindrical battery for a long time, and improving the heat dissipation efficiency of the cylindrical battery while increasing the service life of the wiping ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the present invention.

[0019] Figure 2 It is a schematic diagram of the internal structure of the protective shell.

[0020] Figure 3 For Figure 2Enlarged view of area A in

[0021] Figure 4 Schematic diagram of the internal structure of the housing

[0022] Figure 5 is Figure 4 Enlarged view of area B in

[0023] Figure 6 is Figure 4 Enlarged view of area C in

[0024] Figure 7 Schematic diagram of the chute group

[0025] Figure 8 is Figure 7 Enlarged view of area D in

[0026] Figure 9 Schematic diagram of the wiping ring

[0027] Figure 10 Schematic diagram of the contact between the inner edge of the arc part at one end of the wiping ring and the outer edge of one side of the cylindrical battery

[0028] Figure 11 Schematic diagram of the contact between the inner edge of the arc part at the other end of the wiping ring and the outer edge of the other side of the cylindrical battery

[0029] The names of the components in the drawings are: 1, intake main pipe; 2, lower collecting pipe; 3, intake pipe; 4, housing; 5, cover body; 6, outlet pipe; 7, upper collecting pipe; 8, outlet main pipe; 9, driving shaft; 10, fan blade; 11, first bevel gear; 12, second bevel gear; 13, transmission shaft; 14, first pulley; 15, oblong slot; 16, sprocket; 17, second pulley; 18, belt; 19, chain; 20, connecting column; 21, wiping ring; 22, lower mounting seat; 23, upper mounting seat; 24, cylindrical battery; 25, pole column; 26, protective shell. Detailed implementation manners

[0030] 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 of the embodiments.

[0031] As Figures 1-11 shown, a cylindrical battery module for an electric bicycle includes a plurality of housings 4, and the plurality of housings 4 are arranged in a rectangular array. The lower end of the housing 4 is concentrically and fixedly connected to an intake pipe 3, and the intake pipe 3 is connected to the intake main pipe 1 through the lower collecting pipe 2.

[0032] A cover body 5 is fixedly mounted on the upper end of the housing 4. A gas outlet pipe 6 that is concentrically fixed to the cover body 5 and communicates with the housing 4 is provided. The gas outlet pipe 6 is communicated with the main gas outlet pipe 8 through an upper header 7.

[0033] A cylindrical battery 24 is concentrically fixed inside the housing 4. The pole post 25 of the cylindrical battery 24 penetrates through the cover body 5. Two chute groups are provided on both sides of the inner wall of the housing 4, and the two chute groups are symmetrically arranged.

[0034] Each chute group includes two vertical oval slots 15. Sprockets 16 are rotatably arranged at both the upper and lower ends of the oval slot 15. The upper and lower sprockets 16 inside the oval slot 15 are connected by a chain 19 in a transmission manner.

[0035] A driving assembly is arranged inside the air inlet pipe 3. The output end of the driving assembly is located outside the air inlet pipe 3 and is in transmission connection with the sprocket 16 inside the lower end of the oval slot 15.

[0036] The driving assembly includes a driving shaft 9 that is concentric with the air inlet pipe 3. The driving shaft 9 is rotatably arranged inside the air inlet pipe 3. A fan blade 10 is concentrically fixed to the lower end of the driving shaft 9. A first bevel gear 11 is concentrically fixed to the upper end of the driving shaft 9.

[0037] Both sides of the air inlet pipe 3 are rotatably and sealingly connected with a transmission shaft 13. The two transmission shafts 13 are arranged corresponding to the two chute groups up and down. One end of the transmission shaft 13 is located inside the air inlet pipe 3, and the other end of the transmission shaft 13 is located outside the air inlet pipe 3. A second bevel gear 12 is concentrically fixed to one end of the transmission shaft 13 inside the air inlet pipe 3. The first bevel gear 11 meshes with the second bevel gear 12. Two first belt pulleys 14 are concentrically fixed to one end of the transmission shaft 13 outside the air inlet pipe 3. The axle of the sprocket 16 inside the lower end of the oval slot 15 extends to the outside of the housing 4. The axle of the sprocket 16 inside the lower end of the oval slot 15 is rotatably and sealingly connected with the housing 4. Second belt pulleys 17 are concentrically fixed to the axles of the sprockets 16 located outside the housing 4. The two second belt pulleys 17 on the same side and the two first belt pulleys 14 are respectively connected by two belts 18 in a transmission manner.

[0038] The two second belt pulleys 17, the two first belt pulleys 14 and the two belts 18 on the same side are located inside a protective housing 26. The protective housing 26 is fixedly connected with the housing 4.

[0039] An oval-ring-shaped wiping ring 21 is arranged inside the housing 4. Two connecting columns 20 are fixedly mounted at both ends of the wiping ring 21. The connecting columns 20 are rotatably connected with the chain 19 on one side thereof through ear plates. The connecting columns 20 are arranged at intervals with the sprockets 16. The ear plates are fixedly connected with the chain 19. The connecting columns 20 are rotatably connected with the ear plates.

[0040] During the process that the chain 19 drives the wiping ring 21 to move vertically, the inner edge of the arc-shaped part at one end of the wiping ring 21 contacts the outer edge of one side of the cylindrical battery 24. When the chain 19 drives the connecting column 20 to cross its arc-shaped part, the wiping ring 21 can move horizontally. During the process that the chain 19 drives the connecting column 20 to cross its arc-shaped part and then continues to move vertically, the inner edge of the arc-shaped part at the other end of the wiping ring 21 contacts the outer edge of the other side of the cylindrical battery 24. After the sprocket 16 drives the wiping ring 21 to move up and down reciprocally, the inner edges of the arc-shaped parts at both ends of the wiping ring 21 can wipe the outer edge of the cylindrical battery 24 as a whole.

[0041] Sponge layers are fixed on the inner edges of the two arc-shaped parts of the wiping ring 21. The wiping ring 21 is internally provided with sponge layers, which can synchronously remove the dust or condensate residue on the surface of the cylindrical battery 24 during the up and down movement process, realizing the dual functions of heat dissipation and self-cleaning, and avoiding the local thermal resistance problem caused by the accumulation of impurities.

[0042] An upper mounting seat 23 is fixed at the lower end of the cover body 5, a lower mounting seat 22 is fixed inside the lower end of the housing 4, the cylindrical battery 24 is fixed inside the upper mounting seat 23, the lower end of the cylindrical battery 24 is fixed inside the lower mounting seat 22, the pole column 25 penetrates through the upper mounting seat 23 and is hermetically sealed inside the upper mounting seat 23. After the wiping ring 21 moves to the lower dead center, it contacts the upper end of the lower mounting seat 22. After the wiping ring 21 moves to the upper dead center, it contacts the upper end of the upper mounting seat 23.

[0043] When this battery module works, compressed air containing water vapor is input into the intake main pipe 1. The compressed air containing water vapor flows through the lower header 2 and then enters the intake pipe 3. The compressed air containing water vapor in the intake pipe 3 rises through the annular cavity between the housing 4 and the cylindrical battery 24. When the compressed air containing water vapor passes through the annular cavity between the housing 4 and the cylindrical battery 24, it can cool the cylindrical battery 24. After the compressed air containing water vapor flows through the annular cavity between the housing 4 and the cylindrical battery 24, it is discharged through the outlet pipe 6, the upper header 7 and the outlet main pipe 8.

[0044] When the compressed air containing water vapor flows through the intake pipe 3, it can drive the fan blade 10 and the driving shaft 9 to rotate. During the rotation of the fan blade 10, the driving shaft 13 is driven to rotate through the cooperation of the first bevel gear 11 and the second bevel gear 12. During the rotation of the driving shaft 13, the sprocket 16 inside the lower end of the oval slot 15 is driven to rotate in the same direction and at the same speed through the first belt pulley 14, the second belt pulley 17 and the belt 18. When the lower sprocket 16 rotates, the chain 19 and the upper sprocket 16 rotate.

[0045] Since two connecting columns 20 are fixed at both ends of the wiping ring 21, the connecting column 20 and the chain 19 on one side thereof are rotatably connected through an ear plate. The connecting column 20 and the sprocket 16 are arranged at intervals. The ear plate is fixedly connected to the chain 19, and the connecting column 20 is rotatably connected to the ear plate. Therefore, during the rotation of the chain 19, the wiping ring 21 moves in the vertical direction through the ear plate and the connecting column 20.

[0046] As Figure 10 shown, the ear plate is located on the right side of the chain 19. The inner edge of the left arc portion of the wiping ring 21 is in sliding contact with the outer edge portion of the left side of the cylindrical battery 24. The area of the inner edge of the left arc portion of the wiping ring 21 in sliding contact with the outer edge portion of the left side of the cylindrical battery 24 is half of the outer edge area of the cylindrical battery 24. During the rotation of the chain 19, the wiping ring 21 can move downward. The wiping ring 21 can evenly coat the water adhering to the outer edge portion of the left side of the cylindrical battery 24 on the outer edge portion of the left side of the cylindrical battery 24, thereby forming a water film on the outer edge portion of the left side of the cylindrical battery 24, which can accelerate the evaporation of water and improve the cooling effect on the cylindrical battery 24. During the downward movement of the wiping ring 21, there is a flow gap between the right arc portion of the wiping ring 21 and the outer edge portion of the right side of the cylindrical battery 24, which can allow the compressed air containing water vapor to pass through the flow gap, ensuring the cooling effect on the cylindrical battery 24.

[0047] When the chain 19 drives the wiping ring 21 to cross the lower arc portion of the chain 19 through the connecting column 20 and the ear plate, the wiping ring 21 can move horizontally to the left.

[0048] As Figure 11 shown, when the ear plate is located on the left side of the chain 19, the inner edge of the right arc portion of the wiping ring 21 is in sliding contact with the outer edge portion of the right side of the cylindrical battery 24. The area of the inner edge of the right arc portion of the wiping ring 21 in sliding contact with the outer edge portion of the right side of the cylindrical battery 24 is half of the outer edge area of the cylindrical battery 24. During the rotation of the chain 19, the wiping ring 21 can move upward. The wiping ring 21 can evenly coat the water adhering to the outer edge portion of the right side of the cylindrical battery 24 on the outer edge portion of the right side of the cylindrical battery 24, thereby forming a water film on the outer edge portion of the right side of the cylindrical battery 24, which can accelerate the evaporation of water and improve the cooling effect on the cylindrical battery 24. During the upward movement of the wiping ring 21, there is a flow gap between the left arc portion of the wiping ring 21 and the outer edge portion of the left side of the cylindrical battery 24, which can allow the compressed air containing water vapor to pass through the flow gap, ensuring the cooling effect on the cylindrical battery 24.

[0049] When the chain 19 drives the wiping ring 21 to cross the upper arc portion of the chain 19 through the connecting column 20 and the ear plate, the wiping ring 21 can move horizontally to the right and return to Figure 10 the state shown, and then the wiping ring 21 starts to move downward and coats a water film on the outer edge portion of the left side of the cylindrical battery 24.

[0050] During the rotation of the chain 19, the wiping ring 21 can be driven to reciprocate up and down, and intermittently coat the outer edge part on the left side and the outer edge part on the right side of the cylindrical battery 24 with a water film, thereby ensuring the cooling efficiency of the cylindrical battery 24.

[0051] By controlling the moving path of the wiping ring 21, the inner edge of the arc-shaped part of the wiping ring 21 can alternately contact the outer edge parts on the left and right sides of the cylindrical battery 24, so that the side of the wiping ring 21 in contact with the cylindrical battery 24 coats the outer edge part of the cylindrical battery 24 with a water film, while the side of the wiping ring 21 not in contact with the outer edge of the cylindrical battery 24 is cooled by the compressed air containing water vapor, avoiding damage caused by overheating due to the long-term contact between the wiping ring 21 and the cylindrical battery 24, improving the heat dissipation efficiency of the cylindrical battery 24 and at the same time increasing the service life of the wiping ring 21.

[0052] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A cylindrical battery module for an electric bicycle, comprising a plurality of housings (4). The lower end of the housing (4) is concentrically and fixedly communicated with an air inlet pipe (3). The air inlet pipe (3) is communicated with an air inlet main pipe (1) through a lower collecting pipe (2). The upper end of the housing (4) is fixedly provided with a cover body (5). A gas outlet pipe (6) concentrically and fixedly connected with the housing (4) is arranged on the cover body (5). It is characterized in that, A cylindrical battery (24) is fixedly arranged concentrically inside a housing (4). The pole post (25) of the cylindrical battery (24) penetrates through a cover body (5). Slideway groups are arranged on both sides of the inner wall of the housing (4), and the two slideway groups are symmetrically arranged. Each slideway group includes two vertical oval slots (15). Sprockets (16) are rotatably arranged at both the upper and lower ends of the oval slot (15). The upper and lower sprockets (16) inside the oval slot (15) are drivingly connected by a chain (19). A driving assembly is arranged inside an air inlet pipe (3). The output end of the driving assembly is located outside the air inlet pipe (3) and is drivingly connected with the sprocket (16) inside the lower end of the oval slot (15). A wiping ring (21) in a long oval ring shape is arranged inside the housing (4). Two connecting columns (20) are fixedly arranged at both ends of the wiping ring (21). The connecting column (20) is rotationally connected with the chain (19) on one side thereof through an ear plate. The connecting column (20) and the sprocket (16) are arranged at intervals. During the process that the chain (19) drives the wiping ring (21) to move in the vertical direction, the inner edge of the arc part at one end of the wiping ring (21) contacts the outer edge of one side of the cylindrical battery (24). During the process that the chain (19) drives the connecting column (20) to cross its arc part, the wiping ring (21) can move in the horizontal direction. During the process that the chain (19) drives the connecting column (20) to cross its arc part and then continues to move in the vertical direction, the inner edge of the arc part at the other end of the wiping ring (21) contacts the outer edge of the other side of the cylindrical battery (24). After the sprocket (16) drives the wiping ring (21) to reciprocate up and down, the inner edges of the arc parts at both ends of the wiping ring (21) can wipe the outer edge of the cylindrical battery (24) integrally.

2. The cylindrical battery module for an electric bicycle according to claim 1, characterized in that, The air outlet pipe (6) is communicated with an air outlet main pipe (8) through an upper collecting pipe (7).

3. The cylindrical battery module for an electric bicycle according to claim 1, wherein The multiple housings (4) are arranged in a rectangular array.

4. The cylindrical battery module for an electric bicycle according to claim 1, wherein The driving assembly includes a driving shaft (9) concentric with the air inlet pipe (3). The driving shaft (9) is rotatably arranged inside the air inlet pipe (3). A fan blade (10) is fixedly arranged concentrically at the lower end of the driving shaft (9). A first bevel gear (11) is fixedly arranged concentrically at the upper end of the driving shaft (9). Transmission shafts (13) are rotationally and sealingly connected to both sides of the air inlet pipe (3). The two transmission shafts (13) are arranged corresponding to the two slideway groups up and down. One end of the transmission shaft (13) is located inside the air inlet pipe (3), and the other end of the transmission shaft (13) is located outside the air inlet pipe (3). A second bevel gear (12) is fixedly arranged concentrically at one end of the transmission shaft (13) inside the air inlet pipe (3). The first bevel gear (11) meshes with the second bevel gear (12). Two first belt pulleys (14) are fixedly arranged concentrically at one end of the transmission shaft (13) outside the air inlet pipe (3). The axle of the sprocket (16) inside the lower end of the oval slot (15) extends to the outside of the housing (4). The axle of the sprocket (16) inside the lower end of the oval slot (15) is rotationally and sealingly connected to the housing (4). Second belt pulleys (17) are fixedly arranged concentrically on the axles of the sprockets (16) located outside the housing (4). The two second belt pulleys (17) on the same side and the two first belt pulleys (14) are respectively drivingly connected by two belts (18).

5. The cylindrical battery module for an electric bicycle according to claim 4, characterized in that, The two second pulleys (17), two first pulleys (14) and two belts (18) on the same side are located inside the protective housing (26), and the protective housing (26) is fixedly connected to the housing (4).

6. The cylindrical battery module for an electric bicycle according to claim 1, wherein, An upper mounting seat (23) is fixedly provided at the lower end of the cover body (5), a lower mounting seat (22) is fixedly provided inside the lower end of the housing (4), a cylindrical battery (24) is fixed inside the upper mounting seat (23), the lower end of the cylindrical battery (24) is fixed inside the lower mounting seat (22), a pole column (25) penetrates through the upper mounting seat (23) and is hermetically sealed inside the upper mounting seat (23), and after the wiping ring (21) moves to the lower dead center, it contacts the upper end of the lower mounting seat (22), and after the wiping ring (21) moves to the upper dead center, it contacts the upper end of the upper mounting seat (23).

7. The cylindrical battery module for an electric bicycle according to claim 1, wherein, Sponge layers are fixedly provided on the inner edges of the two arc-shaped portions of the wiping ring (21).

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