TWM591279U - Batteries-in-parallel power supply system of electric vehicle and power shunt thereof - Google Patents

Abstract

This creation is a battery parallel power supply system for electric vehicles and its power parallel device. The power supply system includes a first battery module, a second battery module, a motor controller, and a power parallel device. The power of the battery module is lower than a preset value, the power shunter controls the supply of power from the first battery module to the motor controller, so that the motor controller uses the power of the first battery module to continuously supply power Give the motor of the electric vehicle to improve the endurance of the electric vehicle.

Description

Electric vehicle battery parallel power supply system and its power parallel device

This book is about a battery parallel power supply system for electric vehicles and its power shunt device, especially a power supply system that can improve the endurance of electric vehicles.

In the world's pursuit of energy saving and carbon reduction, many green energy sources are gradually being valued by the public, hoping to effectively reduce their dependence on petroleum energy. Among them, electric transportation vehicles are also gradually prospering under this trend, and the government is also active in this green energy industry. Promote and give relatively high subsidies and concessions in order to attract the public to adopt emerging technologies.

For users, the endurance of electric vehicles is an important consideration. The endurance directly depends on the battery capacity. For electric vehicles that use a high-power motor system (eg, greater than 4kW or more), because a larger number of batteries are required to meet the high-power requirements, the overall battery weight is increased. Such a high-weight battery is not easy for the user to move, so the battery is mainly fixed in the electric vehicle and cannot be easily removed by the user. When the user wants to charge the battery, a charging line must be connected to the vehicle body Only then can the internal battery be charged, which has more restrictions on the charging operation.

On the other hand, if the electric vehicle uses a removable battery as a source of power, the removable battery allows the user to replace it and charge it externally. Although it can overcome the problems of volume and weight and the inconvenience of charging, this type of battery has insufficient capacity. The performance of the maximum output power is not good, so it is often unable to meet the high-power motor system, resulting in insufficient endurance of electric vehicles.

[New problem to be solved]

In order to overcome the problem of poor endurance of the existing power supply system of electric vehicles, this creation provides a battery parallel power supply system and its power parallel device to improve the endurance of electric vehicles.

[Technical means to solve the problem]

According to the preferred technical means of item 1 of the patent application scope of this creation, this creation provides a power parallel device, which is applied to the battery parallel power supply system of electric vehicles. The power parallel device includes:

A control unit;

A switch element electrically connected to the control unit for connection between a first battery module and a second battery module in the battery parallel power supply system;

A communication unit electrically connected to the control unit for externally outputting data of the control unit;

Wherein, when the voltage value of the second battery module is below a critical value, the control unit turns the switching element on, and the power output by the first battery module is supplied to the battery in parallel through the power paralleler A motor controller in the system.

According to the preferred technical means of the seventh patent application of this creation, this creation provides a battery parallel power supply system for an electric vehicle. The electric vehicle includes a motor, and the system includes:

A first battery module, including at least one first battery, for supplying power required by the motor;

A second battery module including at least one second battery for supplying power required by the motor, the voltage of the second battery is greater than the voltage of the first battery;

A motor controller connected to the second battery module for controlling the motor of the electric vehicle;

According to any one of claims 1 to 6 of a power parallel device, connect the first battery module and the motor controller;

Wherein, when the voltage value of the second battery module is below a critical value, the control unit turns the switching element on, and the power output by the first battery module is supplied to the motor controller through the power paralleler .

According to the preferred technical means of item 8 of this patent application, this patent provides a battery parallel power supply system for an electric vehicle. The electric vehicle includes a motor. The system includes:

A first battery module, including at least one first battery, for supplying power required by the motor;

A second battery module including at least one second battery for supplying power required by the motor, the voltage of the second battery is greater than the voltage of the first battery;

A motor controller connected to the second battery module for controlling the motor of the electric vehicle;

A vehicle controller connected to the first battery module, the second battery module and the motor controller;

A power parallel device, connected to the first battery module and the motor controller, includes: A control unit; A switch element electrically connected to the control unit for connection between a first battery module and a second battery module in the battery parallel power supply system; A communication unit electrically connected to the control unit for externally outputting data of the control unit to the vehicle controller;

Wherein, when the voltage value of the second battery module reaches a critical value or less, the vehicle controller turns on the switching element in the power parallel device, and the power output by the first battery module passes through the power parallel device It is supplied to the motor controller.

[New effect]

The effect of this creation by applying for the first item of the patent scope is that when the power of the second battery module reaches below the critical value, the power shunt can automatically control the switching element to turn on, so that the first battery module provides The electric power is given to the motor of the electric vehicle to maintain the endurance of the electric vehicle.

The effect of this creation by applying for the seventh item of the patent scope is that the power paralleler automatically determines whether the power of the second battery module is lower than the power value of the first battery module and the second battery module The preset value, if it is, the power of the first battery module can be provided to the motor controller through the power shunt, and the power of the first battery module is used to continuously supply power to the motor to improve the endurance of the electric vehicle.

The effect of this creation by applying for the eighth item of the patent scope is that the vehicle controller determines whether the power of the second battery module is lower than the pre-charged value according to the voltage values of the first battery module and the second battery module Set value, if it is, the vehicle controller controls the power of the first battery module to provide the motor controller through the power shunt, and the power of the first battery module is used to continuously supply power to the motor to improve the electric vehicle Endurance.

Please refer to FIG. 1, the electric vehicle battery parallel power supply system 100 of the present invention is installed in an electric vehicle, and is used to provide electric power to the motor 200 and control the operation of the motor 200 to drive the wheels of the electric vehicle. The electric vehicle power supply system 100 mainly includes a first battery module 10, a second battery module 20, a motor controller 30, and a power parallelizer 40.

The first battery module 10 is composed of at least one first battery 11 whose rated voltage is the first voltage V1; in this embodiment, the first battery module 10 includes two parallel A battery 11, each of the first batteries 11 is a removable battery, which allows the user to take it out of the electric vehicle and carry it to an external charging stand or a charging station for charging, and then put it back into the electric vehicle after the charging is completed.

The second battery module 20 includes at least one second battery 21 and a battery management circuit. The rated voltage of the second battery 21 is the second voltage V2; compared to the first battery 11, the second battery 21 The second voltage V2 is higher than the first voltage V1. For example, the second voltage V2 is twice the first voltage V1 (V2=2V1), and the energy that the second battery 21 can store is also greater than each first battery 11 In this embodiment, the capacity of the second battery 21 is twice the capacity of each first battery 11. The second battery 21 may be a fixed battery, for example, the fixing device is inside the electric vehicle; or, the second battery 21 is a removable battery, but the user does not need to regularly use the second battery 21 from the electric vehicle Take it out for charging, but if necessary, allow the user to take it out and place it in an external charging stand for charging.

The motor inverter 30 is connected to the second battery module 20 and is used to control the operation of the motor 200. The function of the motor controller 40 also includes converting the received power to drive the motor 200 Driving voltage.

The power combiner 40 connects the first battery module 10, the second battery module 20 and the motor controller 30. Please refer to FIG. 2, the power parallel device 40 includes a control unit 41, a switching element 42 and a communication unit 43. The switching element 42 is connected between the first battery module 10 and the second battery module 20, and is electrically connected to the control unit 41, and is controlled by the control unit 41 to switch to an ON state or an OFF state (OFF). In an embodiment, the switching element 42 is a MOS switching element. The communication unit 43 is electrically connected to the control unit 41. In this embodiment, the communication unit 43 is a controller area network (CAN) communication unit for communicating with the CAN bus in the electric vehicle (BUS ) Connected.

The power parallel device 40 may further include a first voltage sensing element 44, a second voltage sensing element 45, a temperature sensing element 46, a current sensing element 47, and a controllable fuse 48. The first voltage sensing element 44 is connected to the control unit 41 and the first battery module 10 to sense the voltage value of the first battery module 10, and the sensed voltage value is for the control unit 41 to make a judgment. The second voltage sensing element 45 is connected to the control unit 41 and the second battery module 20 to sense the voltage value of the second battery module 20, and the detected voltage value is provided for the control unit 41 to perform judgment. The temperature sensing element 46 is connected to the control unit 41 and senses the operating temperature of the power shunt 40. The operating temperature is for the control unit 41 to determine. The current sensing element 47 is connected to the control unit 41 and connected in series between the first battery module 10 and the switching element 42 to measure the current value output by the first battery module 10 and the measured current value is provided to The control unit 41 judges. The controllable fuse 48 connects the current sensing element 47 and the switching element 42 in series, and the control unit 41 controls whether the controllable fuse 48 is burned.

When the power supply of the electric vehicle has been turned on (key on), the power parallel device 40 measures the voltage value of the first battery module 10 and the voltage value of the second battery module 20. The control unit 41 compares the voltage value of the second battery module 20 with a preset threshold value. When the voltage value of the second battery module 20 is greater than the threshold value, the switching element in the power parallelizer 40 42 is maintained in an OFF state, the second battery module 20 supplies power to the motor controller 30, and the motor controller 30 converts the drive voltage to drive the motor 200.

Please refer to FIG. 3, when the voltage value of the second battery module 20 has been equal to or lower than the threshold value, the switch 22 in the second battery module 20 will be managed by the battery in the second battery module 20 The circuit is closed. The control unit 41 controls the switching element 42 to turn on, so that the power of the first battery module 10 is transmitted to the motor controller 30 through the power parallel device 40. The motor controller 30 converts the power of the first battery module 10 into a driving voltage for driving the motor 200. For example, if the rated voltage of the second battery module 20 is 100V, the threshold may be set to 68V. When the power of the second battery module 20 is equal to or lower than the threshold 68V, the threshold The first battery module 10 supplies power to the motor 200 through the power shunt 40, so the user can continue to ride the electric vehicle to improve the endurance of the vehicle, and the vehicle will not lose power immediately, still giving the user sufficient Time to charge the second battery module 20.

When the first battery module 10 supplies power to the motor controller 30, the power paralleler 40 simultaneously activates protection mechanisms, including overcurrent and overtemperature protection. When the current value measured by the current sensing element 47 is greater than a preset current warning value, or the operating temperature value measured by the temperature sensing element 46 is greater than a temperature warning value, as long as any situation occurs, the The control unit 41 outputs a close command to close the switching element 42, interrupts the power supply path of the first battery module 10 and stops supplying power to the motor controller 30, and sends out a fault code representing overcurrent or overtemperature The fault code can be transmitted to a vehicle controller (VCU) of the electric vehicle through the communication unit 43. Over-current protection can prevent accidents caused by the current output by the first battery module 10 exceeding its maximum rated current; over-temperature protection can prevent the power paralleler 40 from abnormally heating up due to excessive current or component abnormalities and burning.

When the control unit 41 activates the above protection mechanism and turns the switching element 42 to the off state (OFF), the current sensing element 47 connected in series with the switching element 42 will theoretically not measure the current because of the disconnection . However, if the switching element 42 cannot be completely turned off (for example, a fault or a short circuit occurs), the current sensing element 47 will still measure the current. When the control unit 41 determines that there is still a current value, the control unit 41 further controls The controllable fuse 48 is burnt out to protect the power system, to prevent the circuit or electric vehicle from being burned due to excessive current or excessive temperature, and to further issue a corresponding fault code.

Please refer to FIG. 4, which is a second embodiment of the present invention. The communication unit 43 of the power parallelizer 40 is connected to a vehicle controller (VCU) 50 of the electric vehicle. The vehicle control center of the vehicle, the difference between this embodiment and the aforementioned first embodiment is that the vehicle controller 50 can perform part or all of the functions of the control unit 41 in the electric parallel device 40. For example, the vehicle controller 50 determines the voltage values of the first battery module 10 and the second battery module 20 to control the switching element 42 to be turned on or off; or determines whether the current output by the first battery module 10 Exceeding the current warning value to determine whether the switching element 42 needs to be turned off; or determining whether the operating temperature value measured by the temperature sensing element 46 is greater than the temperature warning value to determine whether the switching element 42 needs to be turned off; or to determine whether The controllable fuse 48 needs to be controlled to burn out. Based on the received fault code, the vehicle controller 50 can know the types of problems that currently occur in the electric vehicle, and controls the display panel of the electric vehicle to output corresponding prompt messages for the user's reference.

As shown in FIG. 5, the present invention may further include a DC converter 60 connected to the second battery module 20 for converting the voltage of the second battery module 20 into a DC working voltage, and the DC working voltage is provided to the electric Use of electronic components for the entire vehicle. For example, the DC converter 60 is a Buck DC/DC converter, which can convert a higher level voltage into a lower level DC operating voltage (such as 12V). This DC operating voltage That is, it can be widely used for vehicle components such as headlights, brake lights, dashboards and other vehicle components on the vehicle.

This creation can automatically determine whether the voltage of the second battery module 20 reaches below the preset threshold value through the power parallel device 40. If so, the power parallel device can turn on the internal switching element 42 to make the first battery The power of the module 10 is supplied to the motor controller as a continuous power source for the vehicle to maintain the normal use of the electric vehicle, which not only improves the endurance of the vehicle, but also allows the user sufficient time to replace or charge the second battery module.

In summary, it only describes the embodiments or examples of the technical means adopted by the creation to solve the problem, and is not intended to limit the scope of the implementation of the creation patent. That is, any changes and modifications that are consistent with the context of the application scope of this creative patent, or equivalent changes made in accordance with the scope of this creative patent, are covered by this creative patent scope.

10‧‧‧ First battery module 11‧‧‧ First battery 20‧‧‧ Second battery module 21‧‧‧Second battery 22‧‧‧Switch 30‧‧‧Motor controller 40‧‧‧Power parallel 41‧‧‧Control unit 42‧‧‧Switching element 43‧‧‧Communication unit 44‧‧‧First voltage sensing element 45‧‧‧Second voltage sensing element 46‧‧‧Temperature sensing element 47‧‧‧ Current sensing element 48‧‧‧Controllable fuse 50‧‧‧Vehicle controller 60‧‧‧DC converter 100‧‧‧Electric vehicle battery parallel power supply system 200‧‧‧Motor

Fig. 1: Circuit block diagram of the first embodiment of the battery electric power supply system of the electric vehicle of the present invention. Figure 2: The circuit block diagram of the authored power parallel device. Fig. 3: Schematic diagram of the circuit operation of the first battery module of the first embodiment of the present invention to supply power to the motor through the power shunt. Fig. 4: The circuit block diagram of the second embodiment of the electric vehicle battery parallel power supply system of the present invention. Figure 5: The circuit block diagram of the parallel electric power supply system of the electric vehicle battery parallel power supply of this creation.

10‧‧‧ First battery module

11‧‧‧ First battery

20‧‧‧ Second battery module

21‧‧‧Second battery

22‧‧‧Switch

30‧‧‧Motor controller

40‧‧‧Power parallel

100‧‧‧ Battery parallel power supply system

200‧‧‧Motor

Claims (12)

A power parallel device is applied to a battery parallel power supply system of an electric vehicle. The power parallel device includes: A control unit; A switch element electrically connected to the control unit for connection between a first battery module and a second battery module in the battery parallel power supply system; A communication unit electrically connected to the control unit for externally outputting data of the control unit; Wherein, when the voltage value of the second battery module is below a critical value, the control unit turns the switching element on, and the power output by the first battery module is supplied to the battery in parallel through the power paralleler A motor controller in the system. According to the power parallel device described in claim 1, the control unit is further connected: A first voltage sensing element for sensing the voltage value of the first battery module; A second voltage sensing element is used to sense the voltage value of the second battery module. According to the power parallel device described in claim 1, the control unit is further connected: A temperature sensing element senses the operating temperature of the power shunt, wherein when the operating temperature reaches a temperature warning value, the control unit turns off the switching element. According to the power parallel device described in claim 1, the control unit is further connected: A current sensing element, electrically connected to the control unit and connected in series between the first battery module and the switching element, for sensing the current value output by the first battery module, wherein, when the first battery module The current value output by the group reaches a current warning value, and the control unit outputs a close command to close the switching element. According to the power parallel device described in claim 4, the control unit is further connected: A controllable fuse is connected in series with the current sensing element, wherein, when the control unit has output the switch command and still receives the current value sensed by the current sensing element, the control unit controls the controllable fuse to burn out . The power parallel device according to claim 1, wherein the communication unit is a controller area network (CAN) communication unit for connecting with a CAN bus (BUS) inside the electric vehicle. A battery parallel power supply system for an electric vehicle. The electric vehicle includes a motor. The battery parallel power supply system includes: A first battery module, including at least one first battery, for supplying power required by the motor; A second battery module including at least one second battery for supplying power required by the motor, the voltage of the second battery is greater than the voltage of the first battery; A motor controller connected to the second battery module for controlling the motor of the electric vehicle; According to any one of claims 1 to 6 of a power parallel device, connect the first battery module and the motor controller; Wherein, when the voltage value of the second battery module is below a critical value, the control unit turns the switching element on, and the power output by the first battery module is supplied to the motor controller through the power paralleler . A battery parallel power supply system for an electric vehicle. The electric vehicle includes a motor. The battery parallel power supply system includes: A first battery module, including at least one first battery, for supplying power required by the motor; A second battery module including at least one second battery for supplying power required by the motor, the voltage of the second battery is greater than the voltage of the first battery; A motor controller connected to the second battery module for controlling the motor of the electric vehicle; A vehicle controller connected to the first battery module, the second battery module and the motor controller; A power parallel device, connected to the first battery module and the motor controller, includes: A control unit; A switch element electrically connected to the control unit for connection between a first battery module and a second battery module in the battery parallel power supply system; A communication unit electrically connected to the control unit for externally outputting data of the control unit to the vehicle controller; Wherein, when the voltage value of the second battery module reaches a critical value or less, the vehicle controller turns on the switching element in the power parallel device, and the power output by the first battery module passes through the power parallel device It is supplied to the motor controller. The battery parallel power supply system of an electric vehicle according to claim 7 or 8, wherein the first battery module includes a plurality of first batteries connected in parallel; the second battery is a fixed battery. The battery parallel power supply system of an electric vehicle according to claim 7 or 8, wherein the first battery module includes a plurality of first batteries connected in parallel; the second battery is a removable battery. The battery parallel power supply system of an electric vehicle according to claim 7 or 8, wherein the voltage of the second battery is twice the voltage of each of the first batteries. The battery parallel power supply system of the electric vehicle according to claim 7 or 8, further comprising: A DC converter is connected to the second battery module to convert the voltage of the second battery module into an operating voltage, which is provided to the on-board components in the electric vehicle.

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