阅读说明：本技术 一种电动车能量回收系统以及电动车 (Electric vehicle energy recovery system and electric vehicle ) 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：本发明公开了一种电动车能量回收系统以及一种电动车,该电动车能量回收系统包括有第一整流滤波装置、充电电路以及充放电切换继电器,充放电切换继电器用于实现充电电路以及电动车供电电路之间的切换。当车辆滑行、减速制动时,电动机可以作为发电机工作模式产生电能。本发明通过充放电切换继电器改变电池单元之间的连接关系,降低了在能量回收过程中回收电能的充电电压,实现在电动车低速转态下也可以进行能量回收的目的。本发明通过电动机与发电机配合发电和制动,实现更高效的制动能量回收,电动机发电与发电机发电串联,提高发电电压。本发明能够对电动车能量进行回收,通过回收能量可以实现节能并提高车辆的续航能力。(the invention discloses an electric vehicle energy recovery system and an electric vehicle. The electric motor may be operated as a generator to generate electrical energy when the vehicle is coasting, braked at a reduced speed. The invention changes the connection relation between the battery units through the charge-discharge switching relay, reduces the charging voltage for recovering the electric energy in the energy recovery process, and achieves the purpose of energy recovery under the low-speed rotation state of the electric vehicle. The invention realizes more efficient braking energy recovery by matching the motor and the generator for power generation and braking, and the motor power generation and the generator power generation are connected in series, thereby improving the power generation voltage. The energy recovery device can recover the energy of the electric vehicle, and can realize energy conservation and improve the cruising ability of the vehicle by recovering the energy.)

1. An electric vehicle energy recovery system, comprising:

the first rectifying and filtering device can convert alternating current into direct current;

the charging circuit is connected with the first rectifying and filtering device and used for transmitting electric energy to a battery for electric energy storage;

The charging and discharging switching relay is used for realizing circuit switching, is arranged on the anode and the cathode of the battery of the electric vehicle and is used for realizing switching between the charging circuit and the power supply circuit of the electric vehicle.

2. The energy recovery system for electric vehicles according to claim 1,

The charge-discharge switching relay comprises a normally open end and a normally closed end;

The charging and discharging switching relays are provided with a plurality of charging and discharging switching relays, all of the charging and discharging switching relays are connected in parallel between the normally open ends and in series between the normally closed ends, the charging circuit is connected with the normally open ends, and the power supply circuit of the electric vehicle is connected with the normally closed ends.

3. the energy recovery system for electric vehicles according to claim 1 or 2,

The generator is connected with the first rectifying and filtering device through a confluence relay;

And an electromagnetic clutch is arranged on a generator shaft of the generator, and a brake pedal action induction device is connected with the electromagnetic clutch in a signal mode.

4. The energy recovery system for electric vehicles according to claim 3,

The normally closed end of the confluence relay is connected with the normally open end of the charge-discharge switching relay;

The generator is connected with the first rectifying and filtering device through a normally open end of the confluence relay, and a series structure is formed between the generator and the charging circuit.

5. The energy recovery system for electric vehicles according to claim 3,

A second rectifying and filtering device is connected with the generator and is connected with the first rectifying and filtering device through the confluence relay;

The first rectifying and filtering device is a three-phase rectifying and filtering booster circuit, and the second rectifying and filtering device is a three-phase rectifying and filtering booster circuit.

6. An electric vehicle comprising an electric motor (a) and a battery pack,

Further comprising an electric vehicle energy recovery system as claimed in any one of claims 1 to 5;

The electric vehicle energy recovery system comprises a first rectifying and filtering device, a charging circuit and a charging and discharging switching relay;

The common end of the charge and discharge switching relay is connected with the positive electrode or the negative electrode of the battery pack, the normally open ends of the charge and discharge switching relays on the same pole of the battery pack are connected in parallel and are connected with the charging circuit, the battery pack is connected in series through the normally closed ends of the charge and discharge switching relays, and the positive electrode or the negative electrode of a battery unit in the battery pack is connected with the common end of the charge and discharge switching relays;

The motor is connected with the first rectifying and filtering device, and the first rectifying and filtering device is connected with the charging circuit.

7. The electric vehicle of claim 6,

The electric vehicle energy recovery system comprises a generator (b), and the generator is in power connection with the motor through an electromagnetic clutch (c);

the generator is connected with the first rectifying and filtering device through a confluence relay;

The brake pedal action sensing device is connected with the electromagnetic clutch in a signal mode and used for sensing the action of the brake pedal of the electric vehicle.

8. The electric vehicle of claim 6, wherein the electric motor is a permanent magnet brushless DC motor.

9. The electric vehicle of claim 7, wherein the electric motor is a permanent magnet DC brushless dual output shaft motor.

10. the electric vehicle of claim 7, wherein the electric vehicle is provided with a brake pedal, the brake pedal sequentially comprises an empty pre-braking section and an actual braking section from a lifting state to a fully-treading and pressing state, and the brake pedal motion sensing device is arranged on the brake pedal and used for sensing the brake pedal entering the empty pre-braking section.

Technical Field

The invention relates to the technical field of vehicles, in particular to an electric vehicle energy recovery system and an electric vehicle.

Background

An electric vehicle is a vehicle that runs by using electric energy, and a battery is used to provide the electric energy. In order to increase the cruising ability of the electric vehicle, the energy recovery of the electric vehicle in the actual operation and application process becomes an important design of the electric vehicle. The energy recovery of the electric vehicle is one of the most effective ways for the electric vehicle to travel in the extended range at the present stage, and the energy recovery can realize better utilization of electric energy under the condition that the battery stores energy to a certain extent, so that better support and guarantee can be provided in the aspect of electric vehicle operation.

At the present stage, the electric vehicle mainly recovers energy from different strategies such as heat recovery, braking energy recovery and the like, and the energy recovery efficiency difference is large between different strategies. In addition, because the design of the energy recovery system is complex, the energy recovery system is only applied to the field of electric automobiles, and relatively few energy recovery devices are arranged in the field of electric tricycles. The electro-tricycle is a vehicle with high cost performance, low maintenance and operation cost, energy conservation and environmental protection, and has incomparable competitiveness in the aspects of transportation, urban environment protection, logistics transportation and the like.

Studies have shown that about 1/3 or more of the energy is consumed during braking in urban driving conditions, and that at least 1/5 of the driving energy is lost during braking in suburban driving conditions, as well as in electric vehicles.

disclosure of Invention

In summary, how to reduce the braking energy loss of the electro-tricycle becomes a problem to be solved urgently by those skilled in the art.

in order to achieve the above purpose, the invention provides the following technical scheme:

the invention provides an electric vehicle energy recovery system, which comprises:

the first rectifying and filtering device can convert alternating current into direct current;

The charging circuit is connected with the first rectifying and filtering device and used for transmitting electric energy to a battery for electric energy storage;

The charging and discharging switching relay is used for realizing circuit switching, is arranged on the anode and the cathode of the battery of the electric vehicle and is used for realizing switching between the charging circuit and the power supply circuit of the electric vehicle.

Preferably, the charge-discharge switching relay includes a normally open end and a normally closed end; the charging and discharging switching relays are provided with a plurality of charging and discharging switching relays, all of the charging and discharging switching relays are connected in parallel between the normally open ends and in series between the normally closed ends, the charging circuit is connected with the normally open ends, and the power supply circuit of the electric vehicle is connected with the normally closed ends.

Preferably, the energy recovery system of the electric vehicle further comprises a generator, wherein the generator is connected with the first rectifying and filtering device through a confluence relay; and an electromagnetic clutch is arranged on a generator shaft of the generator, and a brake pedal action induction device is connected with the electromagnetic clutch in a signal mode.

preferably, a normally closed end of the confluence relay is connected with a normally open end of the charge-discharge switching relay; the generator is connected with the first rectifying and filtering device through a normally open end of the confluence relay, and a series structure is formed between the generator and the charging circuit.

Preferably, in the present invention, a second rectifying/smoothing device is connected to the generator, and the second rectifying/smoothing device is connected to the first rectifying/smoothing device through the confluence relay; the first rectifying and filtering device is a three-phase rectifying and filtering booster circuit, and the second rectifying and filtering device is a three-phase rectifying and filtering booster circuit.

The invention also provides an electric vehicle which comprises the motor, the battery pack and the electric vehicle energy recovery system;

The electric vehicle energy recovery system comprises a first rectifying and filtering device, a charging circuit and a charging and discharging switching relay;

The common end of the charge and discharge switching relay is connected with the positive electrode or the negative electrode of the battery pack, the normally open ends of the charge and discharge switching relays on the same pole of the battery pack are connected in parallel and are connected with the charging circuit, the battery pack is connected in series through the normally closed ends of the charge and discharge switching relays, and the positive electrode or the negative electrode of a battery unit in the battery pack is connected with the common end of the charge and discharge switching relays;

the motor is connected with the first rectifying and filtering device, and the first rectifying and filtering device is connected with the charging circuit.

preferably, the motors are in power connection through electromagnetic clutches; the generator is connected with the first rectifying and filtering device through a confluence relay; the brake pedal action sensing device is connected with the electromagnetic clutch in a signal mode and used for sensing the action of the brake pedal of the electric vehicle.

preferably, the motor is a permanent magnet brushless dc motor.

Preferably, the motor is a permanent magnet direct current brushless double output shaft motor.

preferably, the electric vehicle is provided with a brake pedal; the brake pedal comprises an empty pre-braking section and an actual braking section in sequence from a lifting state to a completely treading and pressing state, and the brake pedal action sensing device is arranged on the brake pedal and used for sensing the brake pedal entering the empty pre-braking section.

The invention has the following beneficial effects:

The invention provides an electric vehicle energy recovery system and an electric vehicle. The driving motor of the electric vehicle adopts a permanent magnet direct current brushless motor, when the vehicle slides and decelerates and brakes, the motor can be used as a generator working mode to generate electric energy, the electric energy generated by braking is fed back to the storage battery by utilizing an energy recovery technology, the energy is effectively stored, and meanwhile, the motor generates electromagnetic resistance torque in the power generation process to decelerate the vehicle. The invention changes the connection relation between the battery units through the charge-discharge switching relay, reduces the charging voltage for recovering the electric energy in the energy recovery process, and achieves the purpose of energy recovery under the low-speed rotation state of the electric vehicle. The invention realizes more efficient braking energy recovery by matching the motor and the generator for power generation and braking, and the motor power generation and the generator power generation are connected in series, thereby improving the power generation voltage. The energy recovery device can recover the energy of the electric vehicle, improves the energy utilization efficiency of the electric tricycle, and can realize energy conservation and improve the cruising ability of the vehicle by recovering the energy.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. Wherein:

FIG. 1 is a schematic block diagram of an electric vehicle energy recovery system in an embodiment of the present invention;

FIG. 2 is a block diagram of the connection between the energy recovery system and the battery pack of the electric vehicle according to the embodiment of the invention;

FIG. 3 is a block diagram of the connection between the energy recovery system and the battery pack of the electric vehicle according to another embodiment of the present invention;

Fig. 4 is a block diagram of a charge-discharge switching relay according to an embodiment of the present invention;

Fig. 5 is a schematic diagram of a connection structure between the motor and the discharge machine in the embodiment of the present invention.

In fig. 5, the correspondence between the component names and the reference numerals is:

Motor a, generator b, electromagnetic clutch c.

Detailed Description

The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. The various examples are provided by way of explanation of the invention, and not limitation of the invention. In fact, it will be apparent to those skilled in the art that modifications and variations can be made in the present invention without departing from the scope or spirit thereof. For instance, features illustrated or described as part of one embodiment, can be used with another embodiment to yield a still further embodiment. It is therefore intended that the present invention encompass such modifications and variations as fall within the scope of the appended claims and equivalents thereof.

In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are for convenience of description of the present invention only and do not require that the present invention must be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. The terms "connected" and "connected" used herein should be interpreted broadly, and may include, for example, a fixed connection or a detachable connection; they may be directly connected or indirectly connected through intermediate members, and specific meanings of the above terms will be understood by those skilled in the art as appropriate.

referring to fig. 1 to 5, in which, fig. 1 is a schematic block diagram of an energy recovery system of an electric vehicle according to an embodiment of the present invention; FIG. 2 is a block diagram of the connection between the energy recovery system and the battery pack of the electric vehicle according to the embodiment of the invention; FIG. 3 is a block diagram of the connection between the energy recovery system and the battery pack of the electric vehicle according to another embodiment of the present invention; fig. 4 is a block diagram of a charge-discharge switching relay according to an embodiment of the present invention; fig. 5 is a schematic diagram of a connection structure between the motor and the discharge machine in the embodiment of the present invention.

The invention provides an electric vehicle energy recovery system, which comprises: the first rectifying and filtering device can convert alternating current into direct current; the charging circuit is connected with the first rectifying and filtering device and used for transmitting electric energy to the battery for electric energy storage; the charging and discharging switching relay is arranged on the positive electrode and the negative electrode of the battery of the electric vehicle and used for switching between the charging circuit and the power supply circuit of the electric vehicle.

The electric vehicle energy recovery system provided by the invention is used for being installed on an electric vehicle, and as known to those skilled in the art, the electric vehicle is provided with a battery pack and a motor, the motor can convert electric energy into mechanical energy when being powered on, and the motor can convert the mechanical energy into electric energy when being powered off. Therefore, after the electric vehicle energy recovery system provided by the invention is applied to an electric vehicle, the first rectifying and filtering device is connected with a terminal of the motor (both the supply of electric energy and the output of the electric energy can be realized), and the output current of the motor can be rectified and filtered through the first rectifying and filtering device, so that unstable alternating current generated by the motor is converted into stable direct current.

Specifically, the charge-discharge switching relay comprises a common end, a normally open end and a normally closed end; the charging and discharging switching relay is provided with a plurality of, and in the whole charging and discharging switching relay, parallelly connected between the end of normally opening, establish ties between the end of normally closing, charging circuit is connected with the end of normally opening, and electric motor car power supply circuit is connected with the end of normally closing.

the charging and discharging switching relays are provided with a plurality of charging and discharging switching relays, in a battery pack of the electric vehicle, one charging and discharging switching relay is arranged corresponding to the positive pole and the negative pole of each battery unit, the positive pole and the negative pole of each battery unit are connected with the common end of the charging and discharging switching relays, and the normally closed ends of the charging and discharging switching relays are connected in series, specifically, in the battery pack, in an installation state, the battery units and the charging and discharging switching relays (the normally closed ends) form a series connection relation.

The invention mainly adopts the concept that the kinetic energy of the electric vehicle is converted into electric energy through the motor a of the electric vehicle, the voltage of the converted electric energy is lower, and therefore, in order to improve the generating voltage of the motor a and meet the charging requirement of a battery pack, the invention also provides the generator b for auxiliary power generation, and the generator b is utilized for auxiliary power generation, so that the motor a is matched with the generator b for use, and the voltage of the motor a can be improved after the current of the motor a is connected with the current of the generator b in series.

after the generator b is arranged, the invention also provides a confluence relay, and the generator b is connected with the first rectifying and filtering device through the confluence relay; an electromagnetic clutch c is arranged on a generator shaft of the generator b, and a brake pedal action induction device is connected with the electromagnetic clutch c in a signal mode.

In the above structural design, the normally closed end of the confluence relay is connected with the normally open end of the charge-discharge switching relay; the generator is connected with the first rectifying and filtering device through the normally open end of the confluence relay and forms a series connection structure with the charging circuit.

The invention also provides a second rectifying and filtering device connected with the generator, wherein the second rectifying and filtering device is connected with the first rectifying and filtering device through a confluence relay.

in a preferred embodiment of the present invention, the first rectifying and filtering device and the second rectifying and filtering device employ a three-phase rectifying and filtering booster circuit.

The invention also provides an electric vehicle which comprises a brake pedal, a motor and a battery pack.

The motor runs after being electrified, can convert the electric energy into mechanical energy and export outward to the drive electric motor car traveles, the motor outage back, if the electric motor car is in motion state, then the electric motor car passes through transmission system and is connected with the motor and can drive the motor operation, and the motor can convert mechanical energy into the electric energy and export outward this moment.

Generally, after a brake pedal is stepped on, a brake caliper has a short delay action, a corresponding stroke of the brake pedal corresponding to the delay action is a non-stepping pre-braking section, the brake pedal is continuously stepped on, the brake caliper can really act to realize the rapid braking of the electric vehicle (the vehicle passenger can realize braking, and the passenger has obvious braking feeling), and the corresponding stroke of the brake pedal corresponding to the actual action of the brake caliper is an actual braking section. The following are defined herein: the brake pedal comprises an empty pre-braking section and an actual braking section in sequence from a lifting state to a completely treading and pressing state, and the brake pedal action sensing device is arranged on the brake pedal and used for sensing the brake pedal entering the empty pre-braking section.

The battery pack is composed of four battery units, each battery unit supplies 12V, and the four battery units are connected in series, so that the supply voltage of the battery pack is 48V.

In order to realize energy recovery and achieve the purpose of extending the range of the electric vehicle, the electric vehicle energy recovery system is arranged on the electric vehicle.

Specifically, the electric vehicle energy recovery system comprises a first rectifying and filtering device, a charging circuit and a charging and discharging switching relay, wherein the common end of the charging and discharging switching relay is connected with the anode or the cathode of a battery pack, the normally open ends of the charging and discharging switching relays on the same pole of the battery pack are connected in parallel and connected with the charging circuit, and the battery pack is connected in series through the normally closed ends of the charging and discharging switching relays; the motor is connected with the first rectifying and filtering device, and the first rectifying and filtering device is connected with the charging circuit.

The charging and discharging switching relay is arranged corresponding to the positive pole and the negative pole of each battery unit and is provided with a common end, a normally open end and a normally closed end, the common end is connected with the positive pole of the battery unit (the charging and discharging switching relay arranged on the positive pole of the battery unit) or the negative pole of the battery unit (the charging and discharging switching relay arranged on the positive pole of the battery unit), and in the battery pack, between two adjacent battery units, the normally closed end of the charging and discharging switching relay arranged on the negative pole of the previous battery unit is connected with the normally closed end of the charging and discharging switching relay arranged on the positive pole of the next battery unit, so that the battery units in the battery pack are connected in series through the charging and discharging switching relay in the normal use state of the charging and discharging switching relay.

The device capable of generating electricity (the motor and the generator in the invention) is connected with the normally open end of the charge-discharge switching relay through a cable, when the device capable of generating electricity generates electricity, the coil of the charge-discharge switching relay is electrified, the common end is switched to be disconnected with the normally closed end and connected with the normally open end, and the normally open end adopts a parallel connection structure, so that the device capable of generating electricity can independently charge each battery unit.

The energy recovery system of the electric vehicle comprises a generator, wherein the generator is in power connection with a motor through an electromagnetic clutch; the generator is connected with the first rectifying and filtering device through a confluence relay; the brake pedal action sensing device is connected with the electromagnetic clutch in a signal mode and used for sensing the action of the brake pedal of the electric vehicle.

Specifically, the motor is a permanent magnet brushless dc motor.

Specifically, the motor is a permanent magnet dc brushless dual output shaft motor, and the permanent magnet dc brushless dual output shaft motor used in the present embodiment is mainly used in an embodiment provided with a generator.

when the electric vehicle provided by the invention slides and brakes in a decelerating way, the motor can be used as a generator working mode to generate electric energy for output, and alternating current output by the motor is rectified, filtered and boosted by the three-phase rectification filter circuit to be changed into direct current meeting the charging voltage requirement and then output to the charging circuit.

the invention is mainly applied to the field of electric tricycles, and because of the particularity of the electric tricycles (the speed of a vehicle is low), the voltage value sent by a motor (a permanent magnet brushless direct current motor) is generally between 0 and 20V, and the voltage of a battery pack of the electric tricycle is more than 48V, the battery pack is charged, and the charging of the battery pack can be completed by arranging a charging circuit when the motor has enough power. The three-phase alternating current generated by the permanent magnet brushless direct current motor in the braking and sliding process is converted into direct current through the rectifying and filtering circuit, the input direct current voltage is converted into stable direct current through the boosting and voltage stabilizing circuit, and the battery pack is charged through the charging circuit.

the charging circuit is connected through a single-pole double-throw relay, and coil terminals (shown as 1 and 2 in the figure) of the relay are connected with a charging positive electrode and a charging negative electrode of the power generation system in parallel, so that after the power generation system generates power, the coil terminals are electrified, the common end can be switched, and the normally closed end is switched to the normally open end.

in fig. 2, 3 and 4, the contact 3 is a common end of the relay, the contact 4 is a normally open end of the relay, and the contact 5 is a normally closed end of the relay. When the motor is used as a power source to output power, the ends 1 and 2 of the relay are not electrified, the common end 3 is communicated with the normally closed end 5, and all batteries are connected in series. In the sliding or braking process of the motor, the motor is used as a generator, in the process, a power generation system is provided with a current and voltage input relay electromagnetic coil, the common end 3 of all relays is communicated with the normally open end 4, all batteries are connected in parallel, and the charging voltage is the voltage of a single battery.

The invention has the following beneficial effects: by changing the connection relation of the battery units, the charging voltage can be reduced, and low-voltage charging can be realized in the energy recovery process, so that the energy recovery efficiency is improved.

The invention has two power generation states: 1. when the electric vehicle does not have power input and does not adopt a braking sliding state, only the motor generates electricity, and the battery pack is charged through the three-phase rectifying and filtering circuit and the voltage stabilizing module charging circuit; 2. when the electric vehicle has no power input and the brake pedal performs a braking process, the brake pedal signal processing module triggers the electromagnetic clutch to contact with the movable disc of the motor, and the motor and the generator generate electricity simultaneously to charge the battery.

The electric vehicle provided by the invention is an electric tricycle, in one embodiment of the invention, a motor of the electric tricycle is a permanent magnet direct current brushless double-output shaft motor, an output shaft at one end of the motor provides kinetic energy for the electric vehicle through a transmission system, an output shaft at the other end of the motor is provided with a movable disc, an electromagnetic clutch is matched with the movable disc and is connected with a generator, meanwhile, a brake pedal action induction device is arranged on the electric brake pedal, after a brake signal sent by the brake pedal action induction device is detected, the electromagnetic clutch acts, and the motor is connected with the generator to realize combined power generation. The specific process comprises the following steps: in the braking process, the brake pedal action sensing device transmits braking information to the electromagnetic clutch, a friction plate of the electromagnetic clutch is in contact extrusion with the movable disc to realize connection and drive the generator to generate electricity, meanwhile, the permanent magnet direct current brushless motor also generates electricity, and the motor and the generator are connected in series and then charged to the storage battery after being processed by the rectifier circuit and the boost chopper at the rear end.

Referring to fig. 3, coil terminals 1 and 2 of the junction relay are connected to the positive and negative poles of the generator, and a common terminal 3 of the junction relay is connected to the output terminal of the motor, and in the junction relay: 5 is a normally closed end, and 4 is a normally open end. In the sliding state, only the motor generates power, the 3 and 5 contacts of the confluence relay and the charge-discharge switching relay are connected, and the motor supplies power to the battery unit. In the braking process of the electric vehicle, the brake pedal signal processing module sends braking information to the electromagnetic clutch, the electromagnetic clutch acts and contacts with the movable disc to drive the generator to generate electricity, meanwhile, the coils of the current combination relay are electrified and communicated with the coils 3 and 4, the generator and the motor run together to generate electricity, and the electricity is rectified, filtered and boosted, then connected in series, and charged through the charging circuit. The speed of a vehicle is reduced in the braking process, the generating voltage of the motor is low, and the motor is connected with the generator in series for pressurization to charge the battery monomer, so that the problem that the battery cannot be charged due to low generating voltage is solved.

the electric vehicle brake pedal has a section of idle stroke at the beginning for triggering the brake pedal action induction device, controlling the electromagnetic clutch, letting the generator work, the magnetic moment of the generator decelerates the electric vehicle, and charges simultaneously. The technical effects are as follows: when the power generation resistance moment of the motor is insufficient to achieve the purpose of speed reduction, the generator generates the resistance moment when the brake pedal is stepped down to the idle stroke, and the electric vehicle is decelerated. Compared with the prior art, when the resistance moment of the motor is insufficient, the braking system of the electric vehicle directly participates in braking and improves the energy recovery efficiency.

the electric vehicle mainly comprises a range-extending generator, two groups of battery packs, a permanent magnet direct current motor and a braking energy recovery device, wherein each group of battery packs is provided with an electric quantity detection device, in the braking energy recovery process, the electric quantity detection device sends the electric quantity information of the battery packs to a central control module, and the central control module charges the battery packs with low battery voltage through a control relay according to the electric quantity condition of the battery packs.

The invention provides an electric vehicle energy recovery system and an electric vehicle. The driving motor of the electric vehicle adopts a permanent magnet direct current brushless motor, when the vehicle slides and decelerates and brakes, the motor can be used as a generator working mode to generate electric energy, the electric energy generated by braking is fed back to the storage battery by utilizing an energy recovery technology, the energy is effectively stored, and meanwhile, the motor generates electromagnetic resistance torque in the power generation process to decelerate the vehicle. The invention changes the connection relation between the battery units through the charge-discharge switching relay, reduces the charging voltage for recovering the electric energy in the energy recovery process, and achieves the purpose of energy recovery under the low-speed rotation state of the electric vehicle. The invention realizes more efficient braking energy recovery by matching the motor and the generator for power generation and braking, and the motor power generation and the generator power generation are connected in series, thereby improving the power generation voltage. The energy recovery device can recover the energy of the electric vehicle, improves the energy utilization efficiency of the electric tricycle, and can realize energy conservation and improve the cruising ability of the vehicle by recovering the energy.

The above is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made to the present invention by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.