Double-battery electric power-assisted bicycle

Abstract

The utility model discloses a double-battery electric power-assisted bicycle, which belongs to the technical field of bicycles and comprises a frame, a front wheel and a rear wheel are respectively arranged at the front end and the rear end of the frame, a center shaft is arranged at a five-way position of the frame, pedal cranks are respectively arranged on two sides of the center shaft, a crankset is arranged on the inner side of one of the pedal cranks, and the crankset is arranged on the inner side of the other of the pedal cranks. The chain wheel is connected with a flywheel of the rear wheel through a transmission mechanism, a middle motor capable of driving the middle shaft to rotate is arranged at the five-way position of the frame, a mounting cavity is formed in a lower pipe of the frame, a main battery is arranged in the mounting cavity, and an auxiliary battery is arranged on the rear side of a middle pipe of the frame. The main battery and the auxiliary battery are electrically connected with the middle motor. According to the utility model, the configuration of double batteries is realized, longer cruising ability can be provided, the requirement of longer-distance riding is met, the cruising mileage after single charging is prolonged, and the condition of frequent charging by a rider is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of bicycle technology, and in particular relates to a dual-battery electric-assist bicycle. Background Technology

[0002] An electric-assist bicycle is a mode of transportation that combines a traditional bicycle with an electric motor. It uses an electric drive system to increase pedaling force, assisting the rider in pedaling. Its popularity stems from its ability to adapt to complex road conditions and long-distance riding. Based on a traditional bicycle, an electric-assist bicycle is equipped with a power system centered around a torque sensor, along with a motor and battery. Its working principle involves sensors detecting the rider's pedaling force, and the electric motor then provides corresponding auxiliary power based on this force. Instead of adjusting the power through a throttle, it uses a torque sensor to sense the rider's pedaling force, interpreting the force based on the rider's intentions and providing appropriate power support.

[0003] Most existing e-bikes use a single battery as the power source for the motor, which often limits their range. Riders need to charge frequently, which affects the convenience of use to some extent. Furthermore, as the usage time increases, the battery performance gradually degrades, leading to a further reduction in range. Summary of the Invention

[0004] To address the problems existing in the prior art, this utility model provides a dual-battery electric-assist bicycle, which can realize the configuration of dual batteries, provide longer range, meet the needs of riding over longer distances, extend the range after a single charge, and reduce the need for frequent charging by riders.

[0005] This invention is implemented as follows: a dual-battery electric-assist bicycle includes a frame, with a front wheel and a rear wheel respectively located at the front and rear ends of the frame. A bottom bracket is located at the bottom bracket position of the frame, and pedal cranks are located on both sides of the bottom bracket. A chainring is located inside one of the pedal cranks, and the chainring is connected to the freewheel of the rear wheel via a transmission mechanism. A mid-drive motor capable of rotating the bottom bracket is located at the bottom bracket position of the frame. A mounting cavity is provided inside the downtube of the frame, and a main battery is housed within the mounting cavity. An auxiliary battery is located at the rear of the bottom tube of the frame. The main battery and auxiliary battery are electrically connected to the mid-drive motor. Placing the main battery inside the downtube and the auxiliary battery at the rear of the bottom tube allows for a more even distribution of battery weight across the frame, preventing frame imbalance caused by excessive battery weight. The battery's location at the lower and rear-middle part of the frame helps lower the overall center of gravity, improving vehicle stability and handling. Especially when driving at high speeds or turning, this design can reduce the risk of vehicle rollover.

[0006] Furthermore, the auxiliary battery includes a mounting base and a battery compartment that cooperate with each other. The mounting base includes a connecting part and a protrusion. The side wall of the connecting part is provided with a snap-fit ​​component. The connecting part is provided with a mounting hole. The mounting base is installed on the rear side of the middle tube through the mounting hole and fasteners. The protruding part has a recessed groove on its protruding surface, and a power plug is provided in the recessed groove. The mounting back plate of the battery compartment is provided with a placement cavity adapted to the connecting part. The mounting back plate located on the outer periphery of the placement cavity is provided with a snap-fit ​​groove group that cooperates with the snap-fit ​​component. The mounting back plate of the battery compartment is provided with a recessed part that cooperates with the protrusion. The recessed part is provided with a plug-in boss adapted to the recessed groove. The plug-in boss is provided with a power slot that cooperates with the power plug. The mounting base and battery compartment are secured together via a snap-fit ​​assembly and snap-fit ​​slots. This design ensures a compact yet stable connection. The interlocking design of the protruding and recessed parts not only increases installation stability but also makes the entire structure more compact and reduces space requirements. The snap-fit ​​assembly and slots allow users to easily install the battery compartment onto the mounting base and also easily remove it, greatly simplifying the battery installation and replacement process.

[0007] Furthermore, guide blocks are symmetrically arranged on both sides of the connecting part, and guide grooves are provided in the battery compartment mounting back plates located on both sides of the placement cavity. The guide blocks and guide grooves cooperate with each other. The tight cooperation between the guide blocks and guide grooves helps to ensure a stable connection between the mounting base and the battery compartment, reducing safety hazards caused by loosening or misalignment. The design of the guide blocks and guide grooves makes it easier to align the mounting base and the battery compartment during assembly, thereby simplifying the installation process and improving installation efficiency.

[0008] Furthermore, the snap-fit ​​assembly includes a top snap-fit ​​block and side snap-fit ​​blocks. The top snap-fit ​​block is disposed at the top of the connecting part, and there are two side snap-fit ​​blocks symmetrically disposed on both sides of the connecting part. The snap-fit ​​groove assembly includes a top snap-fit ​​groove and side snap-fit ​​grooves. The top snap-fit ​​groove is disposed in the mounting back plate at the upper end of the placement cavity, and there are two side snap-fit ​​grooves symmetrically disposed in the mounting back plates on both sides of the placement cavity. The top snap-fit ​​block cooperates with the top snap-fit ​​groove, and the side snap-fit ​​block cooperates with the side snap-fit ​​groove.

[0009] The combination of the top locking block and the top locking slot, as well as the combination of the side locking block and the side locking slot, together form a multi-point locking structure. This design greatly enhances the connection stability between the mounting base and the battery compartment. The design of the locking components and locking slots not only makes the installation and removal process between the mounting base and the battery compartment simpler and faster, but also helps to ensure accurate positioning between the mounting base and the battery compartment.

[0010] Furthermore, the mounting hole is an elongated hole structure, and its length direction is aligned with the length direction of the mounting base. This elongated hole design allows for greater adjustment flexibility during installation.

[0011] Furthermore, a driven gear is provided on the central shaft, and the output shaft of the central motor is driven by the driven gear on the central shaft through a driving gear. This enables the central motor to assist the rotation of the central shaft, thereby assisting riding.

[0012] Furthermore, a sealing cover is installed on the lower pipe located on the inlet side of the mounting cavity. The sealing cover prevents external moisture and dust from entering the mounting cavity, improving the safety of electrical components.

[0013] Furthermore, the transmission mechanism is a belt drive mechanism or a chain drive mechanism.

[0014] The advantages and technical effects of this utility model are as follows: By adopting the above technical solution, a dual-battery configuration is achieved by setting the main battery and the auxiliary battery on the rear side of the lower tube and the middle tube respectively, which can provide a longer range, meet the needs of riding over longer distances, extend the range after a single charge, and reduce the need for frequent charging by riders. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure provided in an embodiment of the present utility model;

[0016] Figure 2 This is a schematic diagram of the auxiliary battery structure provided in an embodiment of the present invention;

[0017] Figure 3 This is a schematic diagram of the mounting base structure provided in an embodiment of the present utility model;

[0018] Figure 4 This is a schematic diagram of the battery compartment structure provided in an embodiment of the present invention.

[0019] In the diagram: 1. Frame; 1-1. Downtube; 1-2. Centertube; 2. Front wheel; 3. Rear wheel; 4. Main battery; 5. Secondary battery; 6. Sealing cover; 7. Mounting base; 7-1. Connecting part; 7-2. Protrusion; 7-3. Mounting hole; 7-4. Recessed groove; 7-5. Power plug; 8. Battery compartment; 8-1. Storage cavity; 8-2. Recessed part; 8-3. Insertion boss; 8-4. Power slot; 9. Snap-fit ​​assembly; 9-1. Top snap-fit ​​block; 9-2. Side snap-fit ​​block; 10. Snap-fit ​​groove assembly; 10-1. Top snap-fit ​​groove; 10-2. Side snap-fit ​​groove; 11. Guide block; 12. Guide groove. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this utility model.

[0021] It should be noted that the terms "upper", "lower", "left", "right", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0022] like Figures 1 to 4 As shown, this application provides a dual-battery electric-assisted bicycle, including a frame 1. A front wheel 2 and a rear wheel 3 are respectively provided at the front and rear ends of the frame 1. A bottom bracket is provided at the bottom bracket position of the frame 1. Pedal cranks are provided on both sides of the bottom bracket. A chainring is provided on the inner side of one of the pedal cranks. The chainring is connected to the freewheel of the rear wheel 3 through a transmission mechanism. Specifically, the transmission mechanism is a belt drive mechanism or a chain drive mechanism.

[0023] The frame 1 has a center-drive motor at the bottom bracket position that drives the bottom bracket rotation. Specifically, the bottom bracket has a driven gear, and the output shaft of the center-drive motor is driven by the driven gear on the bottom bracket through a drive gear. This achieves the function of the center-drive motor assisting the bottom bracket rotation, thereby assisting riding. The frame 1 has a mounting cavity inside the lower tube 1-1, and the main battery 4 is housed in the mounting cavity. Preferably, a sealing cover 6 is provided on the lower tube 1-1 located at the entrance of the mounting cavity. The sealing cover 6 prevents external moisture and dust from entering the mounting cavity, improving the safety of the electrical components. A secondary battery 5 is located at the rear of the bottom tube 1-2 of the frame 1. The main battery 4 and the secondary battery 5 are electrically connected to the center-drive motor. This arrangement, with the main battery 4 inside the lower tube 1-1 and the secondary battery 5 at the rear of the bottom tube 1-2, allows for a more even distribution of battery weight across the frame 1, avoiding imbalance caused by excessive battery weight. The battery is located under and in the middle-rear part of the frame 1, which helps to lower the vehicle's center of gravity and improve vehicle stability and handling. Especially when driving at high speeds or cornering, this design can reduce the risk of vehicle rollover.

[0024] Furthermore, the auxiliary battery 5 includes a mounting base 7 and a battery compartment 8 that cooperate with each other. The mounting base 7 includes a connecting portion 7-1 and a protrusion 7-2. A snap-fit ​​component 9 is provided on the side wall of the connecting portion 7-1. A mounting hole 7-3 is provided inside the connecting portion 7-1. The mounting base 7 is installed on the rear side of the middle tube 1-2 through the mounting hole 7-3 and fasteners. Preferably, the mounting hole 7-3 is an elongated hole structure, and the length direction of the mounting hole 7-3 is aligned with the length direction of the mounting base 7. The elongated hole structure design allows the mounting base 7 to have greater adjustment space during installation. A recessed groove 7-4 is provided on the protruding surface of the protrusion 7-2, and a power plug 7-5 is provided in the recessed groove 7-4; a placement cavity 8-1 adapted to the connecting part 7-1 is provided on the mounting back plate of the battery compartment 8, and a snap-fit ​​groove group 10 that cooperates with the snap-fit ​​assembly 9 is provided on the mounting back plate of the battery compartment 8; a recessed part 8-2 that cooperates with the protrusion 7-2 is provided on the mounting back plate of the battery compartment 8, and a plug-in boss 8-3 adapted to the recessed groove 7-4 is provided in the recessed part 8-2, and a power slot 8-4 that cooperates with the power plug 7-5 is provided in the plug-in boss 8-3. The mounting base 7 and the battery compartment 8 are secured together by the engagement of the snap-fit ​​assembly 9 and the snap-fit ​​groove assembly 10. This design ensures a stable connection while maintaining a compact overall battery mounting structure. The engagement of the protrusion 7-2 and the recess 8-2 not only increases installation stability but also makes the entire structure more compact, reducing space occupation. Through the engagement of the snap-fit ​​assembly 9 and the snap-fit ​​groove assembly 10, users can easily install the battery compartment 8 onto the mounting base 7 and also easily remove it, greatly simplifying the battery installation and replacement process.

[0025] Specifically, the snap-fit ​​assembly 9 includes a top snap-fit ​​block 9-1 and a side snap-fit ​​block 9-2. The top snap-fit ​​block 9-1 is located at the top of the connecting part 7-1, and there are two side snap-fit ​​blocks 9-2, which are symmetrically arranged on both sides of the connecting part 7-1. The snap-fit ​​groove assembly 10 includes a top snap-fit ​​groove 10-1 and a side snap-fit ​​groove 10-2. The top snap-fit ​​groove 10-1 is located in the mounting back plate at the upper end of the placement cavity 8-1, and there are two side snap-fit ​​grooves 10-2, which are symmetrically arranged in the mounting back plates on both sides of the placement cavity 8-1. The top snap-fit ​​block 9-1 cooperates with the top snap-fit ​​groove 10-1, and the side snap-fit ​​block 9-2 cooperates with the side snap-fit ​​groove 10-2.

[0026] The engagement of the top locking block 9-1 with the top locking slot 10-1, and the engagement of the side locking block 9-2 with the side locking slot 10-2, together form a multi-point locking structure. This design greatly enhances the connection stability between the mounting base 7 and the battery compartment 8. The design of the locking assembly 9 and the locking slot group 10 not only makes the installation and disassembly process between the mounting base 7 and the battery compartment 8 simpler and faster, but also helps to ensure the accurate positioning between the mounting base 7 and the battery compartment 8.

[0027] Furthermore, guide blocks 11 are symmetrically arranged on both sides of the connecting part 7-1, and guide grooves 12 are provided in the battery compartment 8 mounting back plate located on both sides of the placement cavity 8-1. The guide blocks 11 and guide grooves 12 cooperate with each other. The tight cooperation between the guide blocks 11 and guide grooves 12 helps to ensure a stable connection between the mounting base 7 and the battery compartment 8, reducing safety hazards caused by loosening or misalignment. The design of the guide blocks 11 and guide grooves 12 makes it easier to align the mounting base 7 and the battery compartment 8 during assembly, thereby simplifying the installation process and improving installation efficiency.

[0028] By adopting the above technical solution, a dual-battery configuration is achieved by setting the main battery 4 and the auxiliary battery 5 on the rear side of the lower tube 1-1 and the middle tube 1-2 respectively. This can provide a longer range, meet the needs of riding over longer distances, extend the range after a single charge, and reduce the need for frequent charging by riders.

[0029] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A dual-battery electric-assisted bicycle, comprising a frame, a front wheel and a rear wheel respectively disposed at the front and rear ends of the frame, a bottom bracket disposed at the bottom bracket position of the frame, pedal cranks disposed on both sides of the bottom bracket, a chainring disposed on the inner side of one of the pedal cranks, the chainring being connected to the freewheel of the rear wheel via a transmission mechanism, characterized in that, The frame has a bottom bracket position with a central motor that can drive the bottom bracket to rotate. The frame has a mounting cavity inside the bottom tube, and a main battery is installed inside the mounting cavity. A secondary battery is installed on the rear side of the frame's bottom tube. The main battery and the secondary battery are electrically connected to the central motor.

2. The dual-battery electric-assisted bicycle according to claim 1, characterized in that, The auxiliary battery includes a mounting base and a battery compartment that cooperate with each other. The mounting base includes a connecting part and a protrusion. The side wall of the connecting part is provided with a snap-fit ​​component. The connecting part is provided with a mounting hole. The mounting base is installed on the rear side of the middle tube through the mounting hole and fasteners. The protruding surface of the protrusion is provided with a recessed groove. A power plug is provided in the recessed groove. The mounting back plate of the battery compartment is provided with a placement cavity adapted to the connecting part. The mounting back plate located on the outer periphery of the placement cavity is provided with a snap-fit ​​groove group that cooperates with the snap-fit ​​assembly. The mounting back plate of the battery compartment is provided with a recessed part that cooperates with the protrusion. The recessed part is provided with a plug-in boss adapted to the sink groove. The plug-in boss is provided with a power slot that cooperates with the power plug pin.

3. The dual-battery electric-assisted bicycle according to claim 2, characterized in that, Guide blocks are symmetrically arranged on both sides of the connecting part, and guide grooves are provided in the battery compartment mounting back plate located on both sides of the placement cavity. The guide blocks cooperate with the guide grooves.

4. The dual-battery electric-assisted bicycle according to claim 2, characterized in that, The snap-fit ​​assembly includes a top snap-fit ​​block and side snap-fit ​​blocks. The top snap-fit ​​block is located at the top of the connecting part, and there are two side snap-fit ​​blocks symmetrically arranged on both sides of the connecting part. The snap-fit ​​groove assembly includes a top snap-fit ​​groove and side snap-fit ​​grooves. The top snap-fit ​​groove is located inside the mounting back plate at the upper end of the placement cavity, and there are two side snap-fit ​​grooves symmetrically arranged inside the mounting back plates on both sides of the placement cavity. The top snap-fit ​​block cooperates with the top snap-fit ​​groove, and the side snap-fit ​​block cooperates with the side snap-fit ​​groove.

5. The dual-battery electric-assisted bicycle according to claim 2, characterized in that, The mounting hole is an elongated hole structure, and the length direction of the mounting hole is set in the same direction as the length direction of the mounting base.

6. The dual-battery electric-assisted bicycle according to claim 1, characterized in that, A driven gear is provided on the central shaft, and the output shaft of the central motor is driven by the driven gear on the central shaft through the driving gear.

7. The dual-battery electric-assisted bicycle according to claim 1, characterized in that, A sealing cover is installed on the lower pipe located on the inlet side of the installation cavity.

8. The dual-battery electric-assisted bicycle according to claim 1, characterized in that, The transmission mechanism is a belt drive mechanism or a chain drive mechanism.

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