CN211075554U

CN211075554U - Self-circulation charging and discharging device and power assembly system of electric automobile

Info

Publication number: CN211075554U
Application number: CN201720512582.0U
Authority: CN
Inventors: 吴雄良; 娄珍申; 刘健
Original assignee: Shanghai Ruiyu Automobile Co ltd
Current assignee: Shanghai Ruiyu Automobile Co ltd
Priority date: 2017-05-09
Filing date: 2017-05-09
Publication date: 2020-07-24
Anticipated expiration: 2027-05-09

Abstract

A self-circulation charge and discharge device of an electric automobile comprises a generator, a charge and discharge switching power distribution module, a first battery pack, a second battery pack, a motor driver and a charge and discharge management unit, wherein the charge and discharge management unit outputs a first discharge management instruction and a second discharge management instruction, selects the first battery pack or the second battery pack to discharge, outputs the first charge management instruction and the second charge management instruction and determines whether to charge the first battery pack and the second battery pack; the first battery pack is provided with a first battery management unit, the charging path from the charging and discharging switching power distribution module to the first battery pack is controlled to be switched on and off according to a first charging management instruction, the discharging path from the first battery pack to the motor driver is controlled to be switched on and off according to a first discharging management instruction, the second battery pack is provided with a second battery management unit, the charging path from the charging and discharging switching power distribution module to the second battery pack is controlled to be switched on and off according to a second charging management instruction, and the discharging path from the second battery pack to the motor driver is controlled to be switched on and off according to a second discharging management instruction.

Description

Self-circulation charging and discharging device and power assembly system of electric automobile

Technical Field

The utility model belongs to the technical field of electric automobile power technique and specifically relates to a self-loopa charge-discharge device and power assembly system that relate to electric automobile.

Background

At present, due to the current situation that internal combustion engines of automobiles seriously pollute the environment, electric automobiles are gradually paid attention to people as a green new energy technology with zero emission and low noise.

There are several types of Electric vehicles, Hybrid Electric Vehicles (HEV), Plug-in Hybrid Electric vehicles (PHV), and pure Electric vehicles (BEV). The hybrid electric vehicle is a compromise between a traditional vehicle and a pure electric vehicle, and simultaneously utilizes an internal combustion engine of the traditional vehicle and a motor of the pure electric vehicle to carry out hybrid driving. The plug-in hybrid vehicle is different from the general hybrid vehicle in that the battery can be charged using an external power source and the battery capacity is greater than that of the general hybrid vehicle. The pure electric vehicle stores energy on the vehicle by the storage battery to provide electric power for the vehicle to the motor, and the motor converts electric energy into kinetic energy to push the vehicle.

The range-extended electric automobile is provided with a small auxiliary generator on the basis of a pure electric automobile. The battery is used as a power source, and the auxiliary generator charges the battery when the electric quantity of the battery is insufficient. The utility model discloses the people discovers in the experiment, increases form electric automobile in-service use, and the positive terminal and the negative terminal of battery both are the output that discharges, are the input that charges again. Charging voltage and current are added during dynamic discharge in the driving process of an automobile, and the detection and calculation of a battery by a battery management system can be interfered. The current output fluctuates due to the dynamic variations in the voltage and vehicle operating conditions of the battery under dynamic discharge conditions. However, the voltage and current output by the auxiliary generator cannot be guaranteed to match the discharge characteristics of the battery, which is likely to cause battery failure, and thus may cause safety risks of the vehicle.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide an electric automobile's self-loopa charge and discharge device and power assembly system can reduce battery failure probability and car safety risk.

In order to solve the technical problem, the utility model provides an electric automobile's self-loopa charge-discharge device, switch distribution module, first group battery, second group battery and motor driver and charge-discharge management unit including generator, charge-discharge, wherein: the charging and discharging switching power distribution module is provided with a first charging path, a second charging path, a first discharging path and a second discharging path, the first charging path is connected with the generator and the first battery pack, the second charging path is connected with the generator and the second battery pack, the first discharging path is connected with the first battery pack and the motor driver, and the second discharging path is connected with the second battery pack and the motor driver; the charging and discharging management unit outputs a first discharging management instruction and a second discharging management instruction, selects the first battery pack or the second battery pack to discharge, outputs a first charging management instruction and a second charging management instruction, and determines whether to charge the first battery pack and the second battery pack; the first battery pack is provided with a first battery management unit, the second battery pack is provided with a second battery management unit, the first battery management unit controls the first charging path to be switched on and off according to a first charging management instruction, and controls the first discharging path to be switched on and off according to a first discharging management instruction, the second battery management unit controls the second charging path to be switched on and off according to a second charging management instruction, and controls the second discharging path to be switched on and off according to a second discharging management instruction.

In an embodiment of the present invention, the charging and discharging management unit is incorporated in a vehicle control unit of the vehicle.

The utility model discloses an in the embodiment, be equipped with the switch that is used for control path to switch on and close on first route, the second route of charging, the first route of discharging and the second route of discharging respectively.

The utility model discloses an in an embodiment, self-loopa charge-discharge device still includes electric power management module and block terminal, electric power management module connects the generator, the block terminal is connected electric power management module, electric power management module will after voltage and the electric current of generator adjust the processing, warp the block terminal is exported for charge-discharge switches the distribution module.

The utility model discloses an in an embodiment, the power management module is connected first battery management unit and second battery management unit for adjust the voltage and the current value in the charging process, make the charging process accord with first group battery with the charging characteristic scope of second group battery.

The utility model discloses an in the embodiment, self-loopa charge-discharge device still includes communication bus, charge-discharge management unit, first battery management unit and second battery management unit pass through communication bus and connect.

The utility model discloses still provide an electric automobile's power assembly system, include as above self-loopa charge-discharge device.

Compared with the prior art, the utility model discloses because two group battery work in turn are switched to the electric automobile in-process of traveling, every group battery needn't discharge simultaneously at the in-process that charges like this to reduce battery failure probability and car safety risk. In addition, the two battery packs are switched to be charged alternately, so that the driving range is improved, and the range anxiety is overcome.

Drawings

Fig. 1 is a schematic structural view of a self-circulation charge/discharge device of an electric vehicle according to an embodiment of the present invention.

Fig. 2 is a schematic view of a powertrain system of an electric vehicle according to an embodiment of the present invention.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described herein, and thus the present invention is not limited by the specific embodiments disclosed below.

As used in this application and the appended claims, the terms "a," "an," "the," and/or "the" are not intended to be inclusive in the singular, but rather are intended to be inclusive in the plural unless the context clearly dictates otherwise. In general, the terms "comprises" and "comprising" merely indicate that steps and elements are included which are explicitly identified, that the steps and elements do not form an exclusive list, and that a method or apparatus may include other steps or elements.

The embodiment of the utility model provides a describe electric automobile's main self-loopa of driving motor and fill discharge device and power assembly. In the context of the present invention, the electric vehicle mainly refers to an extended range electric vehicle, i.e. an electric vehicle that uses a battery as a power source and charges the battery through an auxiliary generator. Of course, the utility model discloses can expand to and use the occasion that needs the battery to charge at work.

Fig. 1 is a schematic structural view of a self-circulation charge/discharge device of an electric vehicle according to an embodiment of the present invention. Referring to fig. 1, the self-circulation charge and discharge apparatus 100 of the electric vehicle of the present embodiment includes a generator 110, a charge and discharge switching power distribution module 120, a first battery pack 130, a second battery pack 140, a motor driver 150, and a charge and discharge management unit 160.

The generator 110 is normally powered by fuel, and therefore the self-circulation charge and discharge device 100 further includes an internal combustion engine 111. The fuel used by the internal combustion engine 111 may be gasoline, diesel, alcohol, or the like.

The charging/discharging switching power distribution module 120 has a first charging path 121, a second charging path 122, a first discharging path 123, and a second discharging path 124. The first charging path 121 connects the generator 110 and the first battery pack 130. The second charging path 122 connects the generator 110 and the second battery pack 140. The first discharge path 123 connects the first battery pack 130 and the motor driver 150. The second discharge path 124 connects the second battery pack 140 and the motor driver 150.

The charge and discharge management unit 160 outputs a first discharge management command and a second discharge management command, selects the first battery pack 130 or the second battery pack 140 to discharge, and outputs a first charge management command and a second charge management command to determine whether to charge the first battery pack 130 and the second battery pack 140. Since the present device has the first battery pack 130 and the second battery pack 140, the charging and discharging management unit 160 may first select one of the first battery pack 130 and the second battery pack 140 to supply power. For example, the charging/discharging management unit 160 may output a first discharging management command to discharge the first battery pack 130, and output a second discharging management command to stop discharging the second battery pack 140, or vice versa. For another example, the charging and discharging management unit 160 may output a first charging management instruction to charge the first battery pack 130 or stop charging; and outputting a second charging management command to charge or stop charging the second battery pack 140. The first discharge management command and the second discharge management command may have two states of discharge and stop discharge, respectively. The first charging management command and the second charging management command may have two states of charging and stopping charging.

The first battery pack 130 may have a first battery management unit 131. The second battery pack 140 may have a second battery management unit 141. The first battery management unit 131 is a management unit of the first battery pack 130, and may perform conventional functions such as detection, control, and the like. In this embodiment, the first battery management unit 131 may control the first charging path 121 to be turned on and off according to the first charging management instruction, and control the first discharging path 123 to be turned on and off according to the first discharging management instruction. In this way, it is possible to control whether first battery pack 130 is charged or discharged. Similarly, the second battery management unit 141 may control the second charging path 122 to be turned on and off according to the second charging management instruction, and control the second discharging path 124 to be turned on and off according to the second discharging management instruction. In this way, it is possible to control whether second battery pack 140 is charged or discharged.

In one embodiment, the charge and discharge management unit 160 may be incorporated in a Vehicle Control Unit (VCU) of the vehicle as part of its functionality. Since the entire vehicle control unit of the vehicle has a known interaction path with the first battery management unit 131 and the second battery management unit 141, the charge and discharge management function is incorporated into the entire vehicle control unit, which contributes to simplification of the circuit structure. In another embodiment, the charge/discharge management unit 160 may be a separate unit.

As shown in fig. 1, switches for controlling the paths to be turned on and off may be respectively disposed on the first charging path 121, the second charging path 122, the first discharging path 123 and the second discharging path 124, for example, switches ACK1 and ACK2 are disposed on the first charging path 121, switches AFK1 and AFK2 are disposed on the first discharging path 123, switches BCK1 and BCK2 are disposed on the second charging path 122, and switches BFK1 and BFK2 are disposed on the second discharging path 124. These switches may be relays.

The operation of the apparatus of fig. 1 will now be briefly described, assuming that initially, the motor driver 150 is powered by the first battery pack 130. During the discharging process, the first battery management unit 131 detects the power of the first battery pack 130, and sends a first alarm signal to the charging and discharging management unit 160 when the power of the first battery pack 130 is lower than a first threshold. The charge/discharge management unit 160 determines to stop discharging the first battery pack 130 and charge the first battery pack 130 according to the first alarm signal, and switches to discharging the second battery pack 140. The charging and discharging management unit 160 outputs a first discharging management command, a first charging management command, a second discharging management command, and a second charging management command to the first battery management unit 131 and the second battery management unit 141, respectively, so that the first battery management unit 131 and the second battery management unit 141 perform the connection and disconnection of the corresponding paths.

In one embodiment, the first threshold and the second threshold may be 10-15% of the SOC.

During the discharging process of the second battery pack 140, the second battery management unit 141 detects the power of the second battery pack 140, and sends a second alarm signal to the charge and discharge management unit 160 when the power of the second battery pack 140 is lower than a second threshold. The charge/discharge management unit 160 determines to stop discharging the second battery pack 140 and charge the second battery pack 140 according to the second alarm signal, and switches to discharging the first battery pack 130. The charging and discharging management unit 160 also outputs a first discharging management command, a first charging management command, a second discharging management command, and a second charging management command to the first battery management unit 131 and the second battery management unit 141, respectively, so as to perform the connection and disconnection of the corresponding paths.

During the charging process of the first battery pack 130, the first battery management unit 131 also detects the amount of power of the first battery pack 130, and sends a third alarm signal to the charging and discharging management unit 160 when the amount of power of the first battery pack 130 is higher than a third threshold. The charge and discharge management unit 160 determines to stop charging the first battery pack 130 according to the fourth alarm signal. The generator 110 and the internal combustion engine 111 may be stopped while the charging is stopped.

During the charging process of the second battery pack 140, the second battery management unit 141 detects the power of the second battery pack 140, and sends a fourth alarm signal to the charge and discharge management unit 160 when the power of the second battery pack 140 is higher than a fourth threshold. The charge and discharge management unit 160 determines to stop charging the second battery pack 140 according to the fourth alarm signal. The generator 110 and the internal combustion engine 111 may be stopped while the charging is stopped.

In one embodiment, the third threshold and the fourth threshold may be 80-90% of the SOC.

The functions of the charge and discharge management unit 160, the first battery management unit 131, and the second battery management unit 141 according to an embodiment of the present invention may be implemented by logic circuits, respectively. Those skilled in the art can easily realize the required logic circuit according to the above-described logic operation.

In addition, the first battery pack 130 and the second battery pack 140 may be respectively provided with a charging pile socket to perform supplementary charging with an external power source. The charging current is, for example, direct current. When the charging is carried out, all discharging paths are disconnected. The positive and negative terminals of the charging pile are connected with the positive and negative terminals of the charging and discharging switching power distribution module 120. The first battery management unit 131 and the second battery management unit 141 request a standard charging protocol program by communicating with the charging pile, and control the switch in the charging path to be closed or opened, thereby completing the charging process. Fill electric pile and can mend simultaneously charging to two group batteries, also can mend charging to a group battery.

Referring back to fig. 1, in an embodiment, the self-circulation charging and discharging device 100 of the electric vehicle further includes a power management module 112 and a distribution box 113. The power management module 112 is connected to the generator 110, and the distribution box 113 is connected to the power management module 112. The power management module 112 adjusts the voltage and current of the generator and outputs the adjusted voltage and current to the charging/discharging switching power distribution module 120 through the power distribution box 113.

Preferably, the power management module 112 is connected to the first battery management unit 131 and the second battery management unit 141, and is configured to adjust the voltage and current values during the charging process, so that the charging process conforms to the charging characteristic ranges of the first battery pack and the second battery pack.

Self-cycling charging and discharging device 100 may include a communication bus 170. The charge and discharge management unit 160, the first battery management unit 131, the second battery management unit 141, and the power management module 112 may be connected through a communication bus. In an embodiment, the communication bus may be a CAN bus.

Fig. 2 is a schematic view of a powertrain system of an electric vehicle according to an embodiment of the present invention. Referring to fig. 2, the power train device of the embodiment includes the self-circulation charge and discharge device 100 shown in fig. 1. Further, an Electronic Control Unit (ECU)210, a Motor Control Unit (MCU)220, a drive motor 230, a transmission 240, and the like of the automobile are included. The electric power output from the motor driver 150 is used by the driving motor 230 to output power to the transmission 240. Additional details of this embodiment may be found in the embodiment of fig. 1 and will not be expanded upon herein.

The above embodiment of the utility model, because two group battery work in turn are switched to the electric automobile in-process of traveling, every group battery needn't discharge simultaneously at the in-process that charges like this to reduce battery failure probability and car safety risk. In addition, the two battery packs are switched to be charged alternately, so that the driving range is improved, and the range anxiety is overcome.

Although the present invention has been described with reference to the present specific embodiments, it will be understood by those skilled in the art that the above embodiments are merely illustrative of the present invention, and various equivalent changes and substitutions may be made without departing from the spirit of the present invention, and therefore, changes and modifications to the above embodiments within the spirit of the present invention will fall within the scope of the claims of the present application.

Claims

1. The utility model provides an electric automobile's self-loopa charge-discharge device, switches distribution module, first group battery, second group battery and motor drive and charge-discharge management unit including generator, charge-discharge, its characterized in that:

the charging and discharging switching power distribution module is provided with a first charging path, a second charging path, a first discharging path and a second discharging path, the first charging path is connected with the generator and the first battery pack, the second charging path is connected with the generator and the second battery pack, the first discharging path is connected with the first battery pack and the motor driver, and the second discharging path is connected with the second battery pack and the motor driver;

the charging and discharging management unit outputs a first discharging management instruction and a second discharging management instruction, selects the first battery pack or the second battery pack to discharge, outputs a first charging management instruction and a second charging management instruction, and determines whether to charge the first battery pack and the second battery pack;

the first battery pack is provided with a first battery management unit, the second battery pack is provided with a second battery management unit, the first battery management unit controls the first charging path to be switched on and off according to a first charging management instruction, and controls the first discharging path to be switched on and off according to a first discharging management instruction, the second battery management unit controls the second charging path to be switched on and off according to a second charging management instruction, and controls the second discharging path to be switched on and off according to a second discharging management instruction.

2. The self-circulation charge and discharge device of an electric vehicle according to claim 1, wherein the charge and discharge management unit is incorporated in a vehicle control unit of the vehicle.

3. The self-circulation charge and discharge device of the electric vehicle as claimed in claim 1, wherein the first charge path, the second charge path, the first discharge path and the second discharge path are respectively provided with a switch for controlling the path to be turned on and off.

4. The self-circulation charging and discharging device of the electric vehicle according to claim 1, further comprising a power management module and a distribution box, wherein the power management module is connected to the generator, the distribution box is connected to the power management module, and the power management module adjusts the voltage and current of the generator and outputs the adjusted voltage and current to the charging and discharging switching distribution module through the distribution box.

5. The self-circulation charge and discharge device of the electric vehicle as claimed in claim 4, wherein the power management module is connected to the first battery management unit and the second battery management unit, and is configured to adjust the voltage and current values during the charging process, so that the charging process is in accordance with the charging characteristic ranges of the first battery pack and the second battery pack.

6. The self-circulation charge and discharge device of the electric vehicle according to claim 1 or 4, further comprising a communication bus, wherein the charge and discharge management unit, the first battery management unit and the second battery management unit are connected through the communication bus.

7. A power train of an electric vehicle, characterized by comprising the self-circulation charge and discharge device according to any one of claims 1 to 6.