A range-extending new energy vehicle power generation and power battery cross charging and discharging system

Abstract

The utility model discloses a kind of cross charge-discharge systems of power generation and power battery of range-extender new energy vehicle, it is related to new energy vehicle field, including range-extender, controller, power battery A, power battery B, inverter, electric drive bridge and energy recovery device, the range-extender is electrically connected with power battery A, power battery B, power battery A, power battery B is electrically connected with electric drive bridge by inverter respectively, the energy recovery device is arranged in electric drive bridge, the energy recovery device is electrically connected with electric drive bridge by inverter, the energy recovery device is electrically connected with power battery A, power battery B, the range-extender, power battery A, power battery B, electric drive bridge, energy recovery device are all connected with controller communication by CAN bus, the utility model is alternated by double battery charge-discharge architecture, dynamic power distribution strategy, improve the service life of battery, increase energy utilization efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of new energy vehicles, specifically relating to a power generation and cross-charging / discharging system for range-extended new energy vehicles. Background Technology

[0002] Existing range-extended electric vehicles generally employ a single power battery system coupled with a range-extending power generation unit. Their typical operating mode is as follows: the range extender (such as an internal combustion engine or fuel cell) continuously generates electricity, which is then delivered to the power battery via a power distribution unit (PDU) for charging. Simultaneously, the power battery directly powers the electric drive axle to drive the vehicle. During this process, the power battery must simultaneously undertake the dual tasks of charging and discharging, leading to the following technical drawbacks: 1. Accelerated battery life degradation: Under the combined charging and discharging state, the internal active materials of the power battery repeatedly undergo oxidation-reduction reactions, exacerbating electrode material wear and electrolyte decomposition, significantly shortening cycle life. Especially in high-frequency power fluctuation scenarios (such as frequent start-stop and hill-climbing conditions), the difference in battery charge-discharge rates further triggers the risk of localized thermal runaway, reducing overall safety. 2. Low energy utilization efficiency: The power generation of the range extender and the charging and discharging demands of the power battery are difficult to match in real time, resulting in redundant losses in the energy flow path. For example, when the power battery is at a high charge level, the range extender continues to generate electricity and forcibly charge, resulting in energy waste; while energy recovery during vehicle braking or downhill driving relies solely on a single battery system, and the recovery power is limited by the battery's current state of charge (SOC), resulting in low recovery efficiency.

[0003] Therefore, how to provide a power generation and cross-charging / discharging system for range-extended new energy vehicles has become a problem that needs to be considered by those skilled in the art. Utility Model Content

[0004] In view of this, the present invention provides a range-extended new energy vehicle power generation and power battery cross-charging and discharging system, which improves battery life and increases energy utilization efficiency through a dual-battery alternating charging and discharging architecture and a dynamic power distribution strategy.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A range-extended electric vehicle power generation and power battery cross-charging / discharging system includes a range extender, a controller, power battery A, power battery B, an inverter, an electric drive bridge, and an energy recovery device. The range extender is electrically connected to power batteries A and B. Power batteries A and B are respectively electrically connected to the electric drive bridge via the inverter. The energy recovery device is disposed in the electric drive bridge and is electrically connected to the electric drive bridge via the inverter. The energy recovery device is also electrically connected to power batteries A and B. The range extender, power batteries A and B, electric drive bridge, and energy recovery device are all communicatively connected to the controller via a CAN bus.

[0007] Furthermore, it also includes a battery management system, which is installed in the controller. The data acquisition unit of the battery management system is integrated into power battery A and power battery B respectively. The battery management system is used to collect the SOC value of power battery A and power battery B.

[0008] Furthermore, it also includes a power distribution unit, which is electrically connected to the range extender, the power battery, and the inverter, and is connected to the controller via a CAN bus.

[0009] Furthermore, it also includes a temperature management system, which is connected to the controller via a CAN bus to monitor the temperature of the power battery and the motor, preventing overheating of the alternating charge and discharge system.

[0010] Furthermore, it also includes a DC-DC converter, which is connected in series at the output of the combiner circuit of power battery A and power battery B for powering vehicle electrical appliances.

[0011] The beneficial effects of this utility model are as follows: This utility model uses a range extender to generate electricity. The range extender charges the two power batteries A and B separately through the control system, or the range extender directly supplies power to the electric drive bridge. The number of charge and discharge cycles of a single battery is reduced, which greatly improves the service life of the power battery. By distributing the charge and discharge power, the generation of local hot spots is avoided, which significantly extends the service life under high-temperature scenarios. The overall energy conversion efficiency of the system is improved, the coverage of high-efficiency operating conditions is expanded, and the core pain points of energy flow path redundancy and charge and discharge conflict in the prior art are solved. This provides key technical support for the large-scale application of range-extended new energy vehicles in high-load scenarios such as commercial vehicles and construction machinery. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the circuit connection of this utility model;

[0013] In the diagram: 1. Range extender; 2. Controller; 3. Power battery A; 4. Power battery B; 5. Inverter; 6. Electric drive bridge; 7. Energy recovery device; 8. Data collector; 9. Power distribution unit; 10. CAN bus; 11. DC-DC converter; 12. Vehicle electrical components. Detailed Implementation

[0014] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0015] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "horizontal," "inner," "outer," and "one side," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0016] Example 1

[0017] like Figure 1 As shown, this embodiment discloses a range-extended new energy vehicle power generation and power battery cross-charging and discharging system, including a range extender 1, a controller 2, a power battery A3, a power battery B4, an inverter 5, an electric drive bridge 6, and an energy recovery device 7.

[0018] In this embodiment, the range extender 1 includes an engine and a generator. The engine drives the generator to replenish electrical energy. The range extender 1 is electrically connected to power batteries A3 and B4. Power batteries A3 and B4 are respectively electrically connected to the electric drive bridge 6 via inverter 5. The inverter 5 converts the DC power from the power batteries into AC power for the electric drive bridge 6. In this embodiment, the electric drive bridge 6 supports bidirectional conversion and can convert AC power back to DC power for storage during downhill driving or braking. In this embodiment, the electric drive bridge 6 is used to drive the vehicle and recover energy. Device 7 is installed in electric drive bridge 6. Energy recovery device 7 is electrically connected to electric drive bridge 6 through inverter 5. Energy recovery device 7 includes a recovery motor that can recover energy during downhill or braking. Energy recovery device 7 is electrically connected to power battery A3 and power battery B4. Range extender 1, power battery A3, power battery B4, electric drive bridge 6, and energy recovery device 7 are all connected to controller 2 via CAN bus 10. In this embodiment, controller 2 includes MCU (microcontroller unit) for global strategy control, realizing charging and discharging logic, voltage leveling, and fault protection.

[0019] As a preferred embodiment of this utility model, it also includes a BMS (Battery Management System), which is set in the controller 2. The data acquisition unit 8 of the battery management system is integrated in the power battery A3 and the power battery B4 respectively. The battery management system is used to collect the SOC value of the power battery A3 and the power battery B4.

[0020] In a preferred embodiment of this utility model, a PDU (Power Distribution Unit 9) is also included, which is used to realize the switching of multiple high-voltage power sources and path switching. The Power Distribution Unit 9 is electrically connected to the range extender 1, the power battery, and the inverter 5, respectively. The Power Distribution Unit 9 is also connected to the controller 2 via the CAN bus 10.

[0021] As a preferred embodiment of this utility model, a TMS (Temperature Management System) is also included. The reactivity of the lithium, nickel or cobalt, graphite, and copper chemistry components in the power battery depends on its temperature. The ideal discharge temperature for a typical lithium-ion battery is 20°C. Deviating from this temperature reduces the charging / discharging efficiency of the traction battery, thus decreasing the vehicle's driving range and shortening the battery's lifespan. The temperature management system communicates with the controller 2 via a CAN bus 10. The temperature management system primarily cools the heat-generating components through the refrigerant circuit of the air conditioning system and controls the circuit temperature through valves and temperature sensors to prevent overheating of the alternating charge / discharge system. At the optimal temperature, the discharge power during vehicle start-up and acceleration, the charging capacity during regenerative braking, and the battery's health are all at their best.

[0022] As a preferred embodiment of the present invention, it also includes a DC-DC converter 11, which is connected in series at the output terminal of the combiner circuit of power battery A3 and power battery B4 to adjust the output voltage of the power battery to the voltage required by the vehicle electrical appliance 12.

[0023] The charging principles for power battery A and power battery B of this utility model are as follows:

[0024] 1. When the SOC of power battery A or power battery B is within the range of 20% to 80%, the range extender charges power battery A or power battery B, and the uncharged battery supplies power to the vehicle.

[0025] 2. When either power battery A or power battery B reaches 95% SOC, the range extender charges the other power battery.

[0026] 3. When the SOC of power battery A and power battery B reaches 95%, the range extender stops charging power battery A and power battery B, and the generated electricity is directly used for the operation of the electric drive bridge.

[0027] Although the specific embodiments of the present utility model have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present utility model. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solution of the present utility model are still within the scope of protection of the present utility model.

Claims

1. A power generation and cross-charging / discharging system for a range-extended electric vehicle's power battery, characterized in that, The system includes a range extender, a controller, power battery A, power battery B, an inverter, an electric drive bridge, and an energy recovery device. The range extender is electrically connected to power batteries A and B. Power batteries A and B are each electrically connected to the electric drive bridge via the inverter. The energy recovery device is located in the electric drive bridge and is electrically connected to the electric drive bridge via the inverter. The energy recovery device is also electrically connected to power batteries A and B. The range extender, power batteries A and B, electric drive bridge, and energy recovery device are all connected to the controller via a CAN bus.

2. The range-extended new energy vehicle power generation and power battery cross-charging and discharging system according to claim 1, characterized in that, It also includes a battery management system, which is located in the controller. The data acquisition unit of the battery management system is integrated into power battery A and power battery B respectively. The battery management system is used to collect the SOC value of power battery A and power battery B.

3. The range-extended new energy vehicle power generation and power battery cross-charging and discharging system according to claim 1, characterized in that, It also includes a power distribution unit, which is electrically connected to the range extender, the power battery, and the inverter, and is connected to the controller via a CAN bus.

4. The range-extended new energy vehicle power generation and power battery cross-charging and discharging system according to claim 1, characterized in that, It also includes a temperature management system, which is connected to the controller via a CAN bus to monitor the temperature of the power battery and the motor, and prevent the cross-charging and discharging system from overheating.

5. The range-extended new energy vehicle power generation and power battery cross-charging and discharging system according to claim 1, characterized in that, It also includes a DC-DC converter, which is connected in series at the output of the combiner circuit of power battery A and power battery B for powering vehicle electrical appliances.

Images