阅读说明：本技术 增程式电动车、电源系统以及电源充放电控制方法 (Extended range electric vehicle, power supply system and power supply charging and discharging control method ) 是由 刘昌国 陈恩黔 陈锦龙 张旭 安成 叶航超 杜江 田石金 白宏宇 汪马翔 王昊昊 于 2019-08-12 设计创作，主要内容包括：本发明公开了增程式电动车、电源系统以及电源充放电控制方法,在本发明中,通过设置中央控制系统,以及分别与中央控制系统电性连接的电池组、发电装置以及电动机,本发明将各组成部分有机结合,能够实现电动车的增程。由甲醇发电机通过燃烧甲醇给电池组单元供电,只需添加低排放的甲醇燃料即可实现电动三轮车的远距离运输。多电源耦合充供电,实现三轮车的行驶里程增长,同时切换控制器的作用下实现了电池的浅冲浅放提高电池的循环使用寿命,实现电池组运行总里程的增程,增长了电池组更换周期,实现高效利用。(The invention discloses a range-extended electric vehicle, a power supply system and a power supply charge-discharge control method. The methanol generator supplies power to the battery pack unit by burning methanol, and long-distance transportation of the electric tricycle can be realized by only adding low-emission methanol fuel. The tricycle is charged and powered by multiple power supplies in a coupling mode, the running mileage of the tricycle is increased, shallow charging and shallow discharging of the battery are achieved under the action of the switching controller, the cycle service life of the battery is prolonged, the total running mileage of the battery pack is increased, the replacement period of the battery pack is prolonged, and efficient utilization is achieved.)

1. A charging and discharging control method for a power supply of an extended range electric vehicle is characterized by comprising the following steps: the method comprises the steps that a central control system is arranged, and a battery pack, a power generation device and a motor are respectively and electrically connected with the central control system, wherein the battery pack comprises at least two battery pack units;

the battery pack is charged by the following method:

Detecting the battery electric quantity and the discharge state of each battery unit in the battery pack through a central control system, and charging the battery unit which is lower than the optimal full battery electric quantity and is in the undischarged state through a power generation device;

At the same time, the central control system controls the battery unit, which is at the optimum full charge and is not in the charged state, to discharge the motor.

2. The extended range electric vehicle power supply charge-discharge control method according to claim 1,

When the battery electric quantity of all the battery pack units is lower than the optimal discharge battery electric quantity, selecting a group of battery pack units which have the most battery electric quantity and are not in a charging state in all the current battery pack units to discharge the motor;

Meanwhile, a group of battery pack units which have the least battery electric quantity and are not in a discharging state in all the battery pack units at present are charged through the power generation device.

3. the extended range electric vehicle power supply charge-discharge control method of claim 1, wherein the optimum full charge is 65% to 85% of the total capacity of the battery, and the battery unit stops charging when the charge is at the optimum full charge.

4. The extended range electric vehicle power supply charge-discharge control method of claim 2, wherein the optimal discharge capacity is 45% to 85% of the total battery capacity, and the battery unit stops discharging when the battery discharge capacity is at the optimal full battery capacity.

5. The extended range electric vehicle power supply charge-discharge control method of claim 1, wherein the additional power generation device is a methanol generator.

6. An extended range electric vehicle power system, characterized by, including:

A power generation device;

The battery pack is provided with at least two groups of battery pack units which can be independently charged and discharged;

The central control system comprises a charging switching unit, a discharging switching unit and a control unit;

The charging switching unit comprises a charging electric quantity detection module connected with the battery unit and used for detecting the electric quantity of the battery unit, a discharging detection module connected with the battery unit and used for detecting the discharging state of the battery unit, and a charging switching module connected with the power output end of the power generation device and used for switching a charging circuit, the discharge switching unit comprises a discharge electric quantity detection module connected with the battery unit and used for detecting the battery electric quantity of the battery unit and a discharge switching module connected with the discharge end of the battery unit and used for switching a discharge circuit, the control unit is in signal connection with the charging switching unit and the discharging switching unit and controls the starting and stopping of the power generation device according to the detection signals generated by the charging switching unit and the discharging switching unit.

7. The extended range electric vehicle power supply system of claim 6, wherein the power generation device is a methanol generator.

8. An extended range electric vehicle is characterized in that,

The device comprises a power system, wherein the power system comprises an electric motor and a driving wheel in power connection with the electric motor;

Further comprising the extended range electric vehicle power system of claim 6 or 7, comprising a discharge switching unit connected with the electric motor for enabling an electrical connection between a battery unit and the electric motor.

9. The extended range electric vehicle of claim 8,

The electric motor is connected with the power output end of the gearbox, the driving wheel is connected with the power output end of the gearbox, and the electric motor is in power connection with the driving wheel through the gearbox.

10. The extended range electric vehicle of claim 8 or 9, wherein the extended range electric vehicle is an electric tricycle.

Technical Field

The invention relates to the technical field of vehicles, in particular to an extended range electric vehicle, an extended range electric vehicle power supply system and an extended range electric vehicle power supply charging and discharging control method.

background

The electric tricycle is a transportation vehicle which uses a battery as an energy source and a motor as a power source to drive the tricycle to run so as to realize goods pulling or person pulling, has the advantages of strong applicability, flexibility, simple maintenance, convenient maintenance, low price and the like, and can flexibly pass through narrow roads due to small vehicle body. The electric tricycle is provided with a reversing switch, can conveniently realize the functions of reversing and forward running, is very practical in lanes of roads, such as narrow roads and lanes, and is very convenient for running and stopping. The electric tricycle has the advantages, and is widely applied to the fields of families, urban and rural areas, individual leasing, factories, mining areas, environmental sanitation, community sanitation and the like.

However, the electric tricycle also has certain technical defects, such as:

1. The battery power storage is few, and the condition that the electric quantity runs out and directly stops on the way easily appears in long distance transportation, the goods handling process. In order to prolong the endurance of the electro-tricycle, a manufacturer or an individual can add a standby power supply to the electro-tricycle, and the standby power supply is replaced to continue running after the electric quantity of a main power supply is exhausted. After the standby power supply is additionally arranged, although the driving mileage is effectively improved, the cost of the whole vehicle is increased, the charging time is prolonged, and meanwhile, certain operation danger exists in the replacement process of the main battery and the standby battery.

2. The charging time and amount cannot be precisely controlled, and the battery life is affected after deep charging and over-discharging. If in practical use, the electric tricycle is used up on the same day, but the battery power is not used up, and the optimal charging residual power is not reached, in this state, if charging, the overcharge can be caused to influence the service life of the battery, and if not charging, the driving mileage of the next day is seriously influenced.

3. At present, electric vehicles are not provided with a gear transmission case, and the speed is not stably increased or reduced enough in the acceleration and deceleration processes, so that the heat productivity of a motor is large, the energy consumption is large, and the electric energy conversion efficiency is poor.

disclosure of Invention

problem (A)

In summary, how to solve the problem that the electric tricycle in the prior art has a short endurance mileage due to the influence of the battery becomes a problem to be solved urgently by those skilled in the art.

(II) technical scheme

The invention provides a charging and discharging control method for a power supply of an extended range electric vehicle.

After the hardware system is constructed, the invention charges the battery pack by the following method:

detecting the battery electric quantity and the discharge state of each battery unit in the battery pack through a central control system, and charging the battery unit which is lower than the optimal full battery electric quantity and is in the undischarged state through a power generation device;

At the same time, the central control system controls the battery unit, which is at the optimum full charge and is not in the charged state, to discharge the motor.

Preferably, in the extended range electric vehicle power supply charging and discharging control method provided by the present invention:

when the battery pack is discharged:

When the battery electric quantity of all the battery pack units is lower than the optimal discharge battery electric quantity, selecting a group of battery pack units which have the most battery electric quantity and are not in a charging state in all the current battery pack units to discharge the motor;

Meanwhile, a group of battery pack units which have the least battery electric quantity and are not in a discharging state in all the battery pack units at present are charged through the power generation device.

Preferably, in the extended range electric vehicle power supply charging and discharging control method provided by the present invention: the optimal full-charge battery capacity is 65% to 85% of the total capacity of the battery, and the battery unit stops charging when the battery is at the optimal full-charge battery capacity.

preferably, in the extended range electric vehicle power supply charging and discharging control method provided by the present invention: the optimal battery discharging capacity is 45% -85% of the total capacity of the battery, and the battery pack unit stops discharging when the battery pack discharging capacity is in the optimal full battery capacity.

Preferably, in the extended range electric vehicle power supply charging and discharging control method provided by the present invention: the additional power generation device is a methanol power generator.

The invention also provides a power supply system of the extended range electric vehicle, which comprises:

a power generation device;

the battery pack is provided with at least two groups of battery pack units which can be independently charged and discharged;

The central control system comprises a charging switching unit, a discharging switching unit and a control unit, wherein the charging switching unit comprises a charging electric quantity detection module connected with the battery pack unit and used for detecting the battery electric quantity of the battery pack unit, a discharging detection module connected with the battery pack unit and used for detecting the discharging state of the battery pack unit, and a charging switching module connected with the power output end of the power generation device and used for switching a charging circuit, the discharging switching unit comprises a discharging electric quantity detection module connected with the battery pack unit and used for detecting the battery electric quantity of the battery pack unit and a discharging switching module connected with the discharging end of the battery pack unit and used for switching a discharging circuit, and the control unit is in signal connection with the charging switching unit and the discharging switching unit, And controlling the starting and stopping of the power generation device according to the detection signals generated by the charging switching unit and the discharging switching unit.

Preferably, in the extended range electric vehicle power system, the power generation device is a methanol power generator.

In addition, the invention also provides an extended range electric vehicle which comprises a power system, wherein the power system comprises an electric motor and a driving wheel in power connection with the electric motor. The extended range electric vehicle further comprises the extended range electric vehicle power system, wherein the extended range electric vehicle power system comprises a discharging switching unit, and the discharging switching unit is connected with the motor and used for realizing the electrical connection between the battery pack unit and the motor.

preferably, in the extended range electric vehicle provided by the present invention, the electric vehicle further comprises a transmission case, the electric motor is connected to a power input/output of the transmission case, the driving wheel is connected to a power output of the transmission case, and the electric motor is connected to the driving wheel through the transmission case.

Preferably, the extended range electric vehicle is an electric tricycle.

(III) advantageous effects

The invention provides a range-extended electric vehicle power system and a range-extended electric vehicle provided with the same. In addition, the invention also discloses a charging and discharging control method of the extended range electric vehicle power supply. The invention organically combines all the components and can realize the range extension of the electric vehicle.

Through the structural design, the invention has the following advantages:

1. The methanol generator supplies power to the battery pack unit by burning methanol, the battery pack unit does not need to be charged, and long-distance transportation of the electric tricycle can be realized by only adding low-emission methanol fuel. Even if the fuel is burnt during transportation, the fuel can reach a nearby methanol supply station without stopping on the way and using the residual electricity of the battery.

2. The tricycle is charged and powered by multiple power supplies in a coupling mode, the running mileage of the tricycle is increased, shallow charging and shallow discharging of the battery are achieved under the action of the switching controller, the cycle service life of the battery is prolonged, the total running mileage of the battery pack is increased, the replacement period of the battery pack is prolonged, and efficient utilization is achieved.

3. The transmission ratio is adjusted by arranging the gearbox at the rear end of the motor, so that stable transmission is realized.

Drawings

FIG. 1 is a control schematic block diagram of a power supply charging and discharging control method of an extended range electric vehicle according to an embodiment of the invention;

FIG. 2 is a block diagram illustrating the control principle of charging control in the method for controlling charging and discharging of the power supply of the extended range electric vehicle according to the embodiment of the present invention;

Fig. 3 is a control schematic block diagram of the discharge control in the extended range electric vehicle power supply charge-discharge control method in the embodiment of the invention.

Detailed Description

the embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

in the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1 to fig. 3, fig. 1 is a control schematic block diagram of a power supply charging and discharging control method of an extended range electric vehicle according to an embodiment of the invention; FIG. 2 is a block diagram illustrating the control principle of charging control in the method for controlling charging and discharging of the power supply of the extended range electric vehicle according to the embodiment of the present invention; fig. 3 is a control schematic block diagram of the discharge control in the extended range electric vehicle power supply charge-discharge control method in the embodiment of the invention.

The invention provides a charging and discharging control method for a power supply of an extended range electric vehicle, which mainly controls charging and discharging of an electric tricycle.

Specifically, in one embodiment of the present invention, the charging and discharging control method for the extended range electric vehicle power supply improves the hardware system as follows: the battery pack comprises a central control system, and a battery pack, a power generation device and a motor which are respectively electrically connected with the central control system, wherein the battery pack comprises at least two battery pack units.

Based on the hardware system, the charging mode of the battery is as follows: the battery pack is charged by the following method: detecting the battery electric quantity and the discharge state of each battery unit in the battery pack through a central control system, and charging the battery unit which is lower than the optimal full battery electric quantity and is in the undischarged state through a power generation device;

In the prior art, an electric tricycle is provided with a group of battery packs, and power is supplied to an electric motor by the battery packs so that the electric motor can work in a rotating mode. The electric motor is typically in power connection with a driving shaft through a belt transmission mode, and a driving wheel (a rear wheel of the electric tricycle) is arranged on the driving shaft to rotate so as to realize the running of the electric tricycle.

Based on the structural design, the invention is additionally provided with a central control system, wherein the central control system is the control core of the invention and can carry out system control according to the charge and discharge and the residual electric quantity of the battery pack. The battery pack, the power generation device and the motor are electrically connected with the central control system. The central control system is provided with a charging switching unit and a discharging switching unit. In addition, the invention also divides the battery pack into at least two groups of battery pack units which can work independently.

The central control system is provided with a control unit, the control unit is a control core of the invention and can adopt a single chip microcomputer, the control core has the functions of signal receiving, signal processing, control signal generation, control signal sending and the like, the control core can analyze the detection signals after receiving the detection signals generated by the charging switching unit and the discharging switching unit so as to generate the control signals, and the control signals are sent to the charging switching module of the charging switching unit and the discharging switching module of the discharging switching unit to switch the charging and discharging circuits.

The power generation device is a device capable of generating power, such as a fuel oil generator, a methanol generator or a biofuel generator, and in the present invention, the power generation device is preferably a methanol generator. The methanol generator takes methanol as fuel, can convert the heat energy generated by methanol combustion and the potential energy generated by combustion explosion into electric energy, and the electric energy is output by the electric energy output end of the methanol generator.

The charging switching unit is provided with a charging electric quantity detection module capable of detecting the electric quantity of the battery pack unit, a discharging detection module for detecting the discharging state of the battery pack unit, and a charging switching module for switching the charging circuit.

in the present invention, the charging power detection module and the discharging detection module both use digital circuits, and for the detection of the battery power and the detection of the discharging state of the battery, the present invention is a common technical means for detecting the battery using state in the prior art, such as a detection circuit for the remaining power of a mobile phone on the mobile phone. Therefore, the description of the circuit structures of the charging power detection module and the discharging detection module is omitted.

The charging switching module is a circuit system capable of switching circuits, and the charging switching module is provided with a microprocessor which receives a control signal of the control unit so as to switch the charging circuit.

The discharging switching unit comprises a discharging electric quantity detection module capable of detecting the battery electric quantity of the battery pack unit and a discharging switching module for switching a discharging circuit. For the functions and the structures of each module in the discharge switching unit, please refer to the charge switching unit, which is not described herein again.

After the electric tricycle is subjected to structure optimization design, the specific control scheme is as follows:

State one, while the battery pack is charging

And the charging electric quantity detection module is used for independently detecting the battery electric quantity of each group of battery pack units in the plurality of groups of battery pack units according to a certain frequency. When the electric quantity of the detected battery pack unit is lower than the optimum full battery electric quantity, the discharging state of the battery pack unit is detected through the discharging detection module, and when the battery pack unit is in the non-discharging state, the charging circuit is switched to the battery pack unit through the charging switching module.

And after the line switching is finished, controlling whether the power generation device is started or not. The specific control method comprises the following steps: the battery capacity of the battery unit (the battery unit corresponding to the switching circuit) is detected, when the battery capacity is lower than the optimal full battery capacity, the discharging state of the battery unit is detected, and when the battery unit is in the non-discharging state, the control module controls the power generation device to start to charge the battery unit.

The method comprises the following steps that two steps are needed when a group of battery pack units are charged, the first step is line switching, the battery pack units are detected in electric quantity and discharge states during line switching, the second step is that after the line switching, the battery pack units are detected in electric quantity and discharge states again, and when conditions are met, the power generation device is started to generate power. The battery pack unit is detected twice in the two steps, so that the battery pack unit meeting the state can be charged, and the overshoot problem is avoided.

State two, during discharge of the battery pack

The battery electric quantity of one group of battery pack units is detected, and when the battery electric quantity is lower than the optimal full battery electric quantity, the discharging circuit is switched by the discharging switching module.

Specifically, when the battery pack discharges and the battery power of all the battery pack units is lower than the optimal full battery power, a group with the highest battery power in all the battery pack units is selected to discharge through the discharge switching module for circuit switching to discharge; at the moment, a group with the least battery electric quantity in all the current battery pack units is selected to be charged through the charging switching module for switching the charging circuit.

The invention not only controls the charging of the battery pack unit, but also controls the discharging of the battery pack unit, thereby avoiding the problems of overshoot and over-discharging of the battery pack unit.

based on the extended range electric vehicle power supply charging and discharging control method, the invention constructs a set of extended range electric vehicle power supply system. The extended range electric vehicle power system can be installed on an electric tricycle, a common tricycle or other electric cars.

Specifically, the extended range electric vehicle power system comprises:

Equipment I and power generation device

The power generation device is preferably a methanol power generator. Of course, a generator capable of generating electricity, such as a fuel generator or a biofuel generator, may be applied to the present invention as the power generation device.

Device two, battery pack

The battery pack may be a lead-acid battery, a lithium battery, or other more advanced rechargeable batteries, such as a graphene battery.

The battery pack is provided with at least two groups of battery pack units which can be independently charged and discharged, and each group of battery pack units independently operates, namely independently charges or independently discharges.

Equipment III, central control system

The central control system comprises a charging switching unit, a discharging switching unit and a control unit, wherein the control unit is in signal connection with the charging switching unit and the discharging switching unit and is used for receiving detection signals (receiving signals such as residual battery capacity and the like as control parameters) and sending control signals (used for realizing the control of switching of a charging circuit and a discharging circuit).

The charging switching unit and the discharging switching unit are two sets of independent operating systems, the charging switching unit and the discharging switching unit are designed according to the power supply charging and discharging control method of the extended range electric vehicle, the charging switching unit is involved in the control unit, and the charging switching unit can select the battery pack unit and independently control one group of battery pack units to be charged. The discharge switching unit can select the battery unit and individually control one group of battery units to discharge.

Specifically, the charging switching unit comprises a charging electric quantity detection module connected with the battery pack unit and used for detecting the electric quantity of the battery pack unit, a discharging detection module connected with the battery pack unit and used for detecting the discharging state of the battery pack unit, and a charging switching module connected with the power output end of the power generation device and used for switching a charging circuit, wherein the charging switching module is electrically connected with the battery pack unit.

Specifically, the discharging switching unit comprises a discharging electric quantity detection module connected with the battery pack unit and used for detecting the battery electric quantity of the battery pack unit and a discharging switching module connected with the discharging end of the battery pack unit and used for switching a discharging circuit.

The invention also provides an extended range electric vehicle based on the power supply system of the extended range electric vehicle.

in the invention, the extended range electric vehicle comprises a power system, and specifically, the power system comprises an electric motor and a driving wheel in power connection with the electric motor.

The motor can only run by using electric energy as energy, therefore, the invention installs the power supply system of the extended range electric vehicle on the extended range electric vehicle.

Specifically, the extended range electric vehicle power supply system comprises a discharge switching unit, wherein the discharge switching unit is connected with the motor and used for realizing the electrical connection between the battery pack unit and the motor.

In order to adjust the speed and the power of the electric vehicle, the invention also provides a gearbox, wherein the motor is connected with the power input and output end of the gearbox, the driving wheel is connected with the power output end of the gearbox, and the motor is in power connection with the driving wheel through the gearbox.

In one embodiment of the invention, the gearbox is a gear gearbox, which can improve the control precision of the vehicle speed. In another embodiment of the present invention, the transmission employs a belt reduction system, which can provide overload protection.

The invention provides a range-extended electric vehicle power system and a range-extended electric vehicle provided with the same. In addition, the invention also discloses a charging and discharging control method of the extended range electric vehicle power supply.

in the extended range electric vehicle provided by the invention, the invention is particularly provided with a methanol generator (power generation device) which is used for generating power. The electric energy can be switched and charged to different battery pack units through the detection and the control of the charging switching unit. After the battery pack units are charged, the discharging switching unit is used for controlling to switch and discharge different battery pack units, so that the motor is driven to operate, the motor transmits power to the gear box, and the power is transmitted to the transmission shaft through the gear box and finally to the driving wheel.

in the invention, the methanol generator is provided with a ballast and voltage-stabilizing module, and can output constant-voltage direct current matched with the voltage of the battery pack. The voltage of the constant voltage direct current output by the methanol generator is any voltage between 30V and 60V, and is specifically 48V constant current.

the charging switching unit comprises a charging electric quantity detection module, a discharging detection module, a charging switching module and a control module. The methanol generator generates electricity, and the electric energy can independently charge specific battery pack units through the charging switching module.

specifically, the charging mode among the multiple groups of battery pack units is multi-power-supply coupling charging.

When the battery pack unit is provided with two groups, the double-coupling charging scheme adopted by the invention is as follows:

The electric quantity and the discharge state of the two groups of battery pack units are detected through a charging electric quantity detection module and a discharge state detection module of the charging switching unit. The battery unit detects the battery capacity (ratio of the current capacity to the total capacity), and the discharge state detection detects whether the battery is discharging.

Through the charge capacity detection module and the discharge state detection module, the detected information is transmitted to the charge switching module and the control module, and through comparison and processing, the charge switching module performs charge circuit switching or non-switching action. The control module executes the opening and closing of the methanol generator according to the information transmitted by the detection module.

The charging switching module is switched to be provided with three lines for switching, the first line and the first group of battery pack units are communicated with the charging passage, the second line and the second group of battery pack units are communicated with the charging passage, and the third line and the two groups of charging passages are not communicated.

The conditions for the handover are: when the battery capacity detected by the charging capacity detection module does not reach the optimal full battery capacity (the optimal full battery capacity is any value within 65% to 85% of the total capacity of the battery, or the optimal full battery capacity is 82% of the total capacity of the battery), the discharging state detection module detects that the battery is not discharging.

The conditions for starting the methanol generator by the control module are as follows: the battery capacity detected by the charging capacity detection module does not reach 65% of the total capacity of the optimal fully charged battery (the optimal fully charged battery capacity is any value within 40% to 65% of the total capacity of the battery, or the optimal fully charged battery capacity is 82% of the total capacity of the battery), and meanwhile, the discharging state detection module detects that the battery is not discharging.

The concrete application is as follows:

The charging capacity detection module and the detected battery and discharging state detection module detect two groups of battery packs in real time in the charging process of the electric vehicle, when the charging capacity of one group of battery packs reaches the optimal full-charge capacity of the battery (the optimal full-charge capacity of the battery is any value within 40-65% of the total capacity of the battery, or the optimal full-charge capacity of the battery is 82% of the total capacity of the battery), the charging capacity of the other group of battery packs is lower than the optimal full-charge capacity of the battery after processing and comparison according to signals sent to the charging switching module and the control module by the charging detection module and the discharging state detection module, and the charging switching module is not discharged to switch and communicate with the charging circuit of the other group of battery packs. Another set of batteries is charged. When the electric quantity detection module detects that the charging electric quantity reaches the optimal charging electric quantity, the two groups of batteries are charged with the optimal electric quantity, and the control module controls the methanol generator to be closed. The charging switching module is switched to the third line, and the two groups of battery pack charging circuits are not communicated.

If one group of batteries is discharged to the optimal discharge state in the running process of the electro-tricycle and the discharge switching module is switched to the other group of batteries for discharging, signals detected by the two groups of detection modules are compared and processed by the control switching module and the execution module to meet the conditions of switching and starting the generator, the charging switching module switches the charging path, the control module starts the methanol generator to perform the group of batteries, and therefore the coupling charging and discharging of the two groups of batteries are repeatedly performed to achieve the range extending of the running mileage.

when the battery pack unit is provided with two groups, the double-coupling discharging scheme adopted by the invention is as follows:

The discharging switching module is used for providing electric quantity for the motor in a coupling discharging mode, and the discharging control module mainly comprises a discharging electric quantity detection module and a discharging switching module.

the discharging switching module can form a passage by the first group of battery pack units to supply power to the motor or form a passage by the second group of battery pack units to supply power to the motor when the discharging passage is switched according to a preset program.

in the running process of the electric vehicle, the discharging electric quantity detection module detects a battery electric quantity signal to be detected, sends the battery electric quantity signal to the discharging switching module for signal processing, and when the discharging battery reaches the preset lowest discharging electric quantity, the discharging switching module switches a power supply line to another group of battery packs for discharging so as to provide electric energy for the motor.

Specifically, the capacity of each battery cell is 45% to 85% of the existing battery capacity, respectively, but by coupled charging and discharging of two sets of battery cells, longer distance transportation can be achieved, while the service life of the battery is longer. The cost is reduced while the transportation mileage is increased, and the cost is saved by directly adding a group of battery pack at present, and the driving mileage is farther.

In addition, as another structural improvement point of the invention, a gearbox is added at the rear end of the electric vehicle motor, electric energy is converted into mechanical energy in the running process of the motor and then transmitted to the gearbox, and the gearbox adjusts the transmission ratio of the rotating speed and then outputs the rotating speed to a transmission shaft and then to a driving wheel. The gearbox can be provided with 3-5 stages of adjustable gear ratios, and the transmission ratio of the gearbox is adjusted on a slope or continuously uphill to increase the torque, reduce the problems of motor scalding or insufficient power and the like, and improve the electric energy conversion rate.

through the structural design, the invention has the following advantages:

1. the methanol generator supplies power to the battery pack unit by burning methanol, the battery pack unit does not need to be charged, and long-distance transportation of the electric tricycle can be realized by only adding low-emission methanol fuel. Even if the fuel is burnt during transportation, the fuel can reach a nearby methanol supply station without stopping on the way and using the residual electricity of the battery.

2. The tricycle is charged and powered by multiple power supplies in a coupling mode, the running mileage of the tricycle is increased, shallow charging and shallow discharging of the battery are achieved under the action of the switching controller, the cycle service life of the battery is prolonged, the total running mileage of the battery pack is increased, the replacement period of the battery pack is prolonged, and efficient utilization is achieved.

3. The transmission ratio is adjusted by arranging the gearbox at the rear end of the motor, so that stable transmission is realized.

The embodiments of the present invention have been presented for purposes of illustration and description, and are not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiment was chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.