A range extending battery system for a two-wheeled vehicle

Abstract

The utility model discloses a kind of range extending battery systems for two-wheeled vehicles, including main battery circuit system, range extending battery circuit system and vehicle power supply bus, the main battery circuit system and range extending battery circuit system are parallel with vehicle power supply bus, the vehicle power supply bus is connected in series with two-wheeled vehicle load, the main battery circuit system includes main battery, first ideal diode module and first dynamic bleeder circuit, the main battery, first ideal diode module and first dynamic bleeder circuit are connected in series with vehicle power supply bus, the range extending battery circuit system includes range extending battery, second ideal diode module and second dynamic bleeder circuit, the range extending battery, second ideal diode module and second dynamic bleeder circuit are connected in series with vehicle power supply bus.The range extending battery system for two-wheeled vehicles of the utility model can expand two-wheeled vehicle battery, and battery energy loss is small.

Description

Technical Field

[0001] This utility model relates to a range extender battery system for two-wheeled vehicles. Background Technology

[0002] Electric bicycles are currently an important means of transportation, using batteries as a power source. To increase the driving range of electric bicycles, range extenders can be installed. Generally, the range extender is installed in parallel with the main battery of the two-wheeled vehicle. Traditional parallel connection schemes require modification of the original vehicle's BMS system, which has compatibility issues. Diode-based reverse current protection schemes have high conduction losses (≥0.7V voltage drop), resulting in more than 10% battery energy loss. Utility Model Content

[0003] The main technical problem solved by this utility model is to provide a range extender battery system for two-wheeled vehicles, which can expand the battery capacity of two-wheeled vehicles with minimal battery energy loss.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: A range-extending battery system for two-wheeled vehicles is provided for supplying power to the load of the two-wheeled vehicle. The system includes a main battery circuit system, a range-extending battery circuit system, and a vehicle power supply bus. The main battery circuit system and the range-extending battery circuit system are connected in parallel with the vehicle power supply bus. The vehicle power supply bus is connected in series with the load of the two-wheeled vehicle. The main battery circuit system includes a main battery, a first ideal diode module, and a first dynamic discharge circuit. The main battery, the first ideal diode module, and the first dynamic discharge circuit are connected in series with the vehicle power supply bus. The range-extending battery circuit system includes a range-extending battery, a second ideal diode module, and a second dynamic discharge circuit. The range-extending battery, the second ideal diode module, and the second dynamic discharge circuit are connected in series with the vehicle power supply bus.

[0005] Preferably, the range extender battery circuit system comprises one or more sets.

[0006] Preferably, a motor controller is connected in series between the vehicle power supply bus and the two-wheeled vehicle load.

[0007] Preferably, the first ideal diode module and the second ideal diode module are each provided with a window comparator.

[0008] Preferably, a forward circuit and a reverse freewheeling circuit are respectively provided in the first dynamic discharge circuit and the second dynamic discharge circuit. The forward circuit is connected in parallel with the reverse freewheeling circuit. The current flow direction of the forward circuit of the first dynamic discharge circuit is from the main battery, the first ideal diode module and the forward circuit to the vehicle power supply bus. The current flow direction of the reverse freewheeling circuit is from the reverse freewheeling circuit to the first ideal diode module and the main battery. The current flow direction of the forward circuit of the second dynamic discharge circuit is from the range extender battery, the second ideal diode module and the forward circuit to the vehicle power supply bus. The current flow direction of the reverse freewheeling circuit is from the reverse freewheeling circuit to the second ideal diode module and the range extender battery.

[0009] Preferably, the main battery has a specification of 48V 20Ah, and the range extender battery has a specification of 48V 15Ah.

[0010] The working logic of the window comparator is as follows:

[0011] When the voltage of the vehicle power supply bus V_bus > 54.6V, the first dynamic discharge circuit / the second dynamic discharge circuit outputs a high level, and the reverse freewheeling circuit in the first dynamic discharge circuit / the second dynamic discharge circuit is fully turned on, and the discharge current returns to the main battery / the range extender battery or the discharge current is discharged to the discharge loop; when 53V < V_bus < 54.6V, the motor controller outputs a PWM signal; when V_bus < 53V, the first dynamic discharge circuit / the second dynamic discharge circuit outputs a low level, and the reverse freewheeling circuit in the first dynamic discharge circuit / the second dynamic discharge circuit is turned off.

[0012] The beneficial effects of the present invention are as follows: The range extender battery system for two-wheeled vehicles of the present invention can meet the battery capacity expansion of two-wheeled vehicles, with small battery energy loss, no need to connect the original vehicle communication line (CAN / RS485), and does not depend on the data of the original battery BMS. Description of the Drawings

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts, where:

[0014] Figure 1 is a structural block diagram of the range extender battery system for two-wheeled vehicles of the present invention. Detailed Embodiments

[0015] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0016] Please see Figure 1 A range extender battery system for a two-wheeled vehicle includes a main battery circuit system 1, a range extender battery circuit system 2, and a vehicle power supply bus 3. The main battery circuit system 1 and the range extender battery circuit system 2 are connected in parallel with the vehicle power supply bus 3, and the vehicle power supply bus 3 is connected in series with the two-wheeled vehicle load 5. The main battery circuit system 1 includes a main battery 6, a first ideal diode module 7, and a first dynamic discharge circuit 8, which are connected in series with the vehicle power supply bus 3. The range extender battery circuit system 2 includes a range extender battery 9, a second ideal diode module 10, and a second dynamic discharge circuit 11, which are connected in series with the vehicle power supply bus 3.

[0017] Preferably, the range extender battery circuit 2 system is one or more sets, that is, multiple sets of range extender batteries can be connected in parallel.

[0018] Preferably, a motor controller 4 is connected in series between the vehicle power supply bus 3 and the two-wheeled vehicle load 5.

[0019] Preferably, the first ideal diode module 7 and the second ideal diode module 10 are respectively provided with window comparators 12.

[0020] Preferably, the first dynamic discharge circuit 8 and the second dynamic discharge circuit 11 are respectively provided with a forward circuit and a reverse freewheeling circuit. The forward circuit and the reverse freewheeling circuit are connected in parallel. The current flow direction of the forward circuit of the first dynamic discharge circuit 8 is from the self-powered battery 6, the first ideal diode module 7 and the forward circuit to the vehicle power supply bus 3. The current flow direction of the reverse freewheeling circuit is from the reverse freewheeling circuit to the first ideal diode module 7 and the main battery 6. The current flow direction of the forward circuit of the second dynamic discharge circuit 11 is from the range extender battery 9, the second ideal diode module 10 and the forward circuit to the vehicle power supply bus 3. The current flow direction of the reverse freewheeling circuit is from the reverse freewheeling circuit to the second ideal diode module 10 and the range extender battery 9.

[0021] Preferably, the main battery 6 has a specification of 48V 20Ah, and the range extender battery 9 has a specification of 48V 15Ah.

[0022] The working logic of window comparator 12 is as follows:

[0023] The maximum voltage of the two-wheeler battery is generally 54.6V. When the vehicle power supply bus voltage V_bus > 54.6V, the first dynamic discharge circuit / the second dynamic discharge circuit outputs a high level, and the reverse freewheeling circuit in the first dynamic discharge circuit / the second dynamic discharge circuit is fully turned on. The discharge current returns to the main battery / the range extender battery or the discharge current flows to the discharge loop to recover the battery energy and reduce the battery energy loss. When 53V < V_bus < 54.6V, the motor controller outputs a PWM signal. When V_bus < 53V, the first dynamic discharge circuit / the second dynamic discharge circuit outputs a low level, and the reverse freewheeling circuit in the first dynamic discharge circuit / the second dynamic discharge circuit is turned off. The current flows to the two-wheeler load through the forward circuit to supply power to the two-wheeler load. The range extender battery circuit system expands the battery capacity and increases the driving range of the two-wheeler. The range extender battery system does not need to be connected to the original vehicle communication line (CAN / RS485) and does not depend on the data of the original battery BMS.

[0024] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification of the present invention, or directly or indirectly applied in other related technical fields, shall be similarly included in the patent protection scope of the present invention.

Claims

1. A range-extending battery system for two-wheeled vehicles, used to supply power to a load in a two-wheeled vehicle, comprising a main battery circuit system, a range-extending battery circuit system, and a vehicle power supply bus, characterized in that, The main battery circuit system and the range extender battery circuit system are connected in parallel with the vehicle power supply bus. The vehicle power supply bus is connected in series with the two-wheeler load. The main battery circuit system includes a main battery, a first ideal diode module, and a first dynamic discharge circuit. The main battery, the first ideal diode module, and the first dynamic discharge circuit are connected in series with the vehicle power supply bus. The range extender battery circuit system includes a range extender battery, a second ideal diode module, and a second dynamic discharge circuit. The range extender battery, the second ideal diode module, and the second dynamic discharge circuit are connected in series with the vehicle power supply bus.

2. The range extender battery system for two-wheeled vehicles according to claim 1, characterized in that, The range extender battery circuit system is one group or multiple groups.

3. The range extender battery system for two-wheeled vehicles according to claim 1 or 2, characterized in that, A motor controller is connected in series between the vehicle power supply bus and the two-wheeler load.

4. The range extender battery system for two-wheeled vehicles according to claim 3, characterized in that, Window comparators are respectively arranged in the first ideal diode module and the second ideal diode module.

5. The range extender battery system for two-wheeled vehicles according to claim 4, characterized in that, The first dynamic discharge circuit and the second dynamic discharge circuit respectively include a forward circuit and a reverse freewheeling circuit. The forward circuit is connected in parallel with the reverse freewheeling circuit. The current flow direction of the forward circuit of the first dynamic discharge circuit is from the main battery, the first ideal diode module, and the forward circuit to the vehicle power supply bus. The current flow direction of the reverse freewheeling circuit is from the reverse freewheeling circuit to the first ideal diode module and the main battery. The current flow direction of the forward circuit of the second dynamic discharge circuit is from the range extender battery, the second ideal diode module, and the forward circuit to the vehicle power supply bus. The current flow direction of the reverse freewheeling circuit is from the reverse freewheeling circuit to the second ideal diode module and the range extender battery.

6. The range extender battery system for two-wheeled vehicles according to claim 5, characterized in that, The specification of the main battery is 48V 20Ah, and the specification of the range extender battery is 48V 15Ah.

7. The range extender battery system for two-wheeled vehicles according to claim 6, characterized in that, The working logic of the window comparator is as follows: When the voltage of the vehicle power supply bus V_bus > 54.6V, the first dynamic discharge circuit / second dynamic discharge circuit outputs a high level, and the reverse freewheeling circuits in the first dynamic discharge circuit / second dynamic discharge circuit are fully turned on, and the discharge current returns to the main battery / range extender battery or is discharged to the discharge loop. When 53V < V_bus < 54.6V, the motor controller outputs a PWM signal. When V_bus < 53V, the first dynamic discharge circuit / second dynamic discharge circuit outputs a low level, and the reverse freewheeling circuits in the first dynamic discharge circuit / second dynamic discharge circuit are turned off.

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