Range-extending type power system with dual-power battery pack and automobile

Abstract

The invention discloses an extended-range power system with a dual-power battery pack and an automobile, and in the extended-range power system with the dual-power battery pack, a range extender does not need to generate electricity for directly driving a driving motor; therefore, the first power battery pack and the second power battery pack equivalently play a role in working condition isolation between the range extender and the driving motor, and the working condition of the range extender is not directly influenced by the working condition of the driving motor; due to the fact that the working condition of the driving motor is usually very complex, and charging of the first power battery pack and the second power battery pack can usually have a relatively stable working condition, the range extender can obtain a stable and good working condition through isolation of the working condition of the driving motor, and therefore the range extender can be in a proper state, and the service life of the range extender is prolonged. And low unit oil consumption is obtained, and the maintenance period and the service life of the range extender are prolonged, so that the use cost of the range extending type automobile is reduced. The invention is widely applied to the technical field of automobiles.

Description

Technical Field

[0001] This invention relates to the field of automotive technology, and in particular to a range-extended power system and automobile with dual power battery packs. Background Technology

[0002] With the increasing severity of the global energy crisis and environmental pollution, new energy vehicles are gradually becoming a new trend in the automotive industry. Range-extended electric vehicles (REEVs), as an important type of new energy vehicle, have received widespread attention. REEVs are typically equipped with a range extender (consisting of an engine and a generator), a battery pack, and a drive motor, designed to increase the vehicle's range and reduce energy consumption.

[0003] In traditional range-extended electric vehicles (REEVs), when the battery is fully charged, it directly powers the drive motor, providing driving power. When the battery is low, the range extender activates, charging the battery while simultaneously powering the drive motor. This design allows the range extender to operate under various conditions, but it also introduces several problems. First, when the range extender starts, it needs to simultaneously charge the battery and power the drive motor, increasing its workload, reducing efficiency, and increasing fuel consumption. Second, due to the higher power demand of the range extender, its displacement also increases, resulting in lower fuel economy and increased operating costs. Furthermore, the range extender's output power is unstable as it simultaneously charges the battery and powers the drive motor, negatively impacting the driving experience. Summary of the Invention

[0004] In view of at least one of the above-mentioned technical problems, the object of the present invention is to provide a range-extended power system and a vehicle with dual power battery packs.

[0005] On one hand, embodiments of the present invention include a range-extended power system with dual power battery packs, the range-extended power system with dual power battery packs comprising: First power battery pack; Second power battery pack; A drive motor; the drive motor is used to receive power and output driving force for the vehicle. First switching module; the first switching module is used to selectively connect the power supply connection between the first power battery pack and the second power battery pack and the drive motor; Range extender; the range extender is used to generate electricity to charge the first power battery pack and / or the second power battery pack; A control module; the control module is used to control the charging and discharging of the first power battery pack and the second power battery pack.

[0006] Furthermore, the range-extended powertrain system with dual battery packs also includes: A battery management module; the battery management module is used to detect the first power battery pack's first power battery pack's first power battery pack's second ... A direct charging module for the battery pack; the direct charging module for the battery pack is used to connect the charging connection between the first power battery pack and the second power battery pack, so that the first power battery pack discharges to charge the second power battery pack.

[0007] Furthermore, the range-extended powertrain system with dual battery packs also includes: The second switching module is used to selectively connect the first power battery pack and the second power battery pack to the range extender for charging.

[0008] Furthermore, the control of charging and discharging of the first power battery pack and the second power battery pack includes: When both the first power information and the second power information are lower than the power threshold, and the first power information is higher than the second power information, the second switching module is controlled to connect the charging connection between the first power battery pack and the range extender, the range extender is controlled to start, and the first switching module is controlled to connect the power supply connection between the second power battery pack and the drive motor. When both the first power information and the second power information are lower than the power threshold, and the first power information is lower than the second power information, the second switching module is controlled to connect the charging connection between the second power battery pack and the range extender, the range extender is controlled to start, and the first switching module is controlled to connect the power supply connection between the first power battery pack and the drive motor. When both the first power information and the second power information are equal to or higher than the power threshold, and the first power information is higher than the second power information, the second switching module is controlled to disconnect the charging connection of the range extender, the range extender is controlled to stop, and the first switching module is controlled to connect the power supply connection between the first power battery pack and the drive motor. When both the first power information and the second power information are equal to or higher than the power threshold, and the first power information is lower than the second power information, the second switching module is controlled to disconnect the charging connection of the range extender, the range extender is controlled to stop, and the first switching module is controlled to connect the power supply connection between the second power battery pack and the drive motor. When the first power information is equal to or higher than the power threshold, and the second power information is lower than the power threshold, the second switching module is controlled to connect the range extender to the charging connection of the second power battery pack, the range extender is controlled to start, and the first switching module is controlled to connect the first power battery pack to the power supply connection of the drive motor. When the second power information is equal to or higher than the power threshold, and the first power information is lower than the power threshold, the second switching module is controlled to connect the range extender to the charging connection of the first power battery pack, the range extender is controlled to start, and the first switching module is controlled to connect the second power battery pack to the power supply connection of the drive motor.

[0009] Furthermore, the logical available capacity of the second power battery pack is higher than that of the first power battery pack.

[0010] Furthermore, the control of charging and discharging of the first power battery pack and the second power battery pack includes: When the second battery level is detected to be higher than the first battery level, the first process is triggered. In the first process, the first switching module is controlled to connect the power supply between the second power battery pack and the drive motor, and the range extender is controlled to stop until the second power information drops to the minimum power limit, triggering the execution of the second process; the minimum power limit is not lower than the current first power information; In the second process, the first switching module is controlled to connect the power supply connection between the first power battery pack and the drive motor, the battery pack direct charging module is controlled to connect the charging connection between the first power battery pack and the second power battery pack, and the range extender is controlled to stop until the first power information drops to zero, triggering the execution of the third process; In the third process, the first switching module is controlled to connect the power supply connection between the second power battery pack and the drive motor, the battery pack direct charging module is controlled to disconnect the charging connection between the first power battery pack and the second power battery pack, and the range extender is controlled to start until the first power information rises to the logical available capacity of the first power battery pack, and then the first process is executed.

[0011] Furthermore, the logical available capacity of the first power battery pack is equal to the physical available capacity of the first power battery pack, and the logical available capacity of the second power battery pack is equal to the physical available capacity of the second power battery pack. The physical available capacity of the second power battery pack is higher than that of the first power battery pack.

[0012] Furthermore, the physical available capacity of the second power battery pack is equal to the physical available capacity of the first power battery pack; The battery management module configures the logical available capacity of the first power battery pack to be lower than the physical available capacity of the first power battery pack, and configures the logical available capacity of the second power battery pack to be equal to the physical available capacity of the second power battery pack.

[0013] Furthermore, the range-extended powertrain system with dual battery packs also includes: A heat dissipation module; the heat dissipation module is used to dissipate heat from the first power battery pack and the second power battery pack.

[0014] On the other hand, embodiments of the present invention also include a vehicle comprising the range-extended power system with dual power battery packs as described in the embodiments.

[0015] The beneficial effects of the embodiments of the present invention are as follows: In the range-extended power system with dual power battery packs in the embodiments, since the range extender is used to generate electricity to charge the power battery packs without generating electricity to directly drive the drive motor, the first and second power battery packs effectively isolate the operating conditions between the range extender and the drive motor. The operating condition of the range extender is not directly affected by the operating condition of the drive motor. Since the operating condition of the drive motor is usually very complex due to the direct influence of traffic conditions and vehicle driving status, while the charging of the first and second power battery packs can usually have relatively stable operating conditions, the isolation of the operating conditions of the drive motor allows the range extender to obtain stable and good operating conditions. This is beneficial for the range extender to be in a suitable state, obtain lower unit fuel consumption, extend the maintenance cycle and service life of the range extender, and thus reduce the operating cost of the range-extended vehicle. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a range-extended power system with dual power battery packs in the embodiment; Figure 2 This is a schematic diagram of the basic structure of the range-extended power system with dual power battery packs in the embodiment. Figures 3(a), 3(b), 3(c), 3(d), 3(e), and 3(f) are schematic diagrams illustrating the principles of steps S1-S6 in the embodiment. Figures 4(a), 4(b), and 4(c) are schematic diagrams illustrating the principles of steps P1-P4 in the embodiment. Detailed Implementation

[0017] Terminology Explanation: MOSFET: Metal Oxide Semiconductor Field Effect Transistor, is a controllable switching device; IGBT: Insulated-Gate Bipolar Transistor, is a controllable switching device; SOC: State of Charge, is a parameter that measures the remaining usable capacity of a battery. It is generally expressed as the ratio of the remaining usable capacity to its fully charged capacity.

[0018] This embodiment provides a range-extended power system with dual power battery packs. (Refer to...) Figure 1 The range-extended power system with dual battery packs includes a first battery pack, a second battery pack, a drive motor, a first switching module, a range extender, and a control module. The first and second battery packs are two independent battery packs, meaning they can be charged and discharged independently. The first switching module can contain multiple controllable switches based on MOSFETs, IGBTs, etc. The first switching module selectively connects one of the first and second battery packs to the drive motor, allowing that battery pack to discharge and supply power to the drive motor, thus enabling the drive motor to rotate and drive the vehicle. A drive motor-compatible auxiliary power supply can also be configured. The range extender includes components such as a power circuit (used to receive instructions from the driver or autonomous driving program, thereby inverting and processing the DC power output from the power battery pack, controlling the current waveform output to the drive motor, so that the drive motor outputs power with appropriate parameters such as power, speed, and torque), a transmission system (used to transmit the power output from the drive motor to components such as the differential), and a differential (used to transmit the power transmitted from the transmission system to the wheels); the range extender includes components such as a fuel engine and a generator. When the range extender is working, the fuel engine drives the generator to generate electricity, thereby outputting electrical energy that can be charged into the first or second power battery pack.

[0019] Building upon this foundation, components such as a battery management module, a second switching module, and a direct charging module for the battery pack can be added. The battery management module can manage the first and second power battery packs separately. Taking the management of the first power battery pack as an example, the module can monitor the charge level of the first power battery pack in real time (which can be expressed as SOC, etc.) to obtain first charge level information. It can also monitor the operating temperature of the first power battery pack to prevent overheating. Furthermore, the module can rectify and regulate the power input from external sources (such as the range extender) to obtain a waveform suitable for the first power battery pack, thus charging it. Finally, the module can control the charging and discharging rate of the first power battery pack. Similarly, the battery management module can perform the same processing on the second power battery pack, such as monitoring its charge level in real time to obtain second charge level information.

[0020] In this embodiment, similar to the first switching module, the second switching module may have multiple controllable switches based on MOSFETs, IGBTs, etc. The second switching module selectively connects the first power battery pack and the second power battery pack to the range extender for charging. That is, it connects one of the first power battery pack and the second power battery pack to the range extender, so that when the range extender generates electricity, the electricity can be input to the power battery pack connected to the range extender to charge that power battery pack.

[0021] In this embodiment, the battery pack direct charging module may internally include a controllable switch based on MOSFETs, IGBTs, etc., and a DC-DC charging circuit. The power input terminal of the battery pack direct charging module is connected to the power output terminal of the first power battery pack, and vice versa. When the controllable switch inside the battery pack direct charging module is open, there is no direct power transmission channel between the first and second power battery packs. When the controllable switch inside the battery pack direct charging module is closed, the DC-DC charging circuit inside the battery pack direct charging module will create a small input impedance to the first power battery pack, allowing the power output from the first power battery pack to be output to the battery pack direct charging module. The battery pack direct charging module performs DC boost processing on the power, thereby outputting a voltage higher than the terminal voltage of the second power battery pack, enabling the battery pack direct charging module to output power to the second power battery pack, ultimately achieving the goal of the first power battery pack discharging to charge the second power battery pack.

[0022] In this embodiment, the control module can specifically be a component with functions such as data acquisition, data processing, and control command output. In this embodiment, the control module can control components such as the first switching module, the second switching module, the range extender, and the battery pack direct charging module; that is, the disconnection, connection, switching, start-up, and stop actions performed by these components can be executed under the control of the control module.

[0023] In this embodiment, Figure 1 The basic architecture of the range-extended power system with dual battery packs shown is as follows: Figure 2 As shown. (Refer to...) Figure 2 In this basic architecture, only a first power battery pack, a second power battery pack, a range extender, a first switching module, and a drive motor need to be configured. (Refer to...) Figure 2 The range extender only establishes an electrical connection with the first and second power battery packs, and does not establish a direct electrical connection with the drive motor. This allows the range extender to generate electricity only to charge the power battery packs, without generating electricity to directly drive the drive motor. The first and second power battery packs establish an electrical connection with the drive motor through a first switching module, so that at any given time, one of the power battery packs is connected to the drive motor, thereby outputting electrical energy to the drive motor.

[0024] Figure 2 In the basic architecture of the range-extended power system with dual battery packs shown, since the range extender generates electricity to charge the battery packs without directly driving the drive motor, the first and second battery packs effectively isolate the operating conditions between the range extender and the drive motor. The operating condition of the range extender is not directly affected by the operating condition of the drive motor. Because the operating condition of the drive motor is often very complex (e.g., highly volatile and unpredictable) due to direct influence from traffic conditions and vehicle driving status, while the charging of the first and second battery packs typically has relatively stable operating conditions (e.g., low volatility, strong time-varying patterns, and easy prediction), the isolation of the drive motor's operating condition allows the range extender to achieve stable and optimal operating conditions. This helps the range extender maintain a suitable state, resulting in lower fuel consumption per unit, extended maintenance cycles and lifespan, and ultimately reduced operating costs for range-extended vehicles.

[0025] In this embodiment, the control module can control components such as the first switching module, the second switching module, the range extender, and the battery pack direct charging module, thereby executing an energy management method to control the charging and discharging of the first and second power battery packs, thus achieving... Figure 2Based on the energy consumption reduction achieved by the basic architecture shown, the operating conditions of the range extender, the first power battery pack, and the second power battery pack are further optimized.

[0026] In this embodiment, when the control module controls the charging and discharging of the first and second power battery packs in the energy management method, it can specifically perform the following steps: S1. When both the first power information and the second power information are lower than the power threshold, and the first power information is higher than the second power information, control the second switching module to connect the charging connection between the first power battery pack and the range extender, control the range extender to start, and control the first switching module to connect the power supply connection between the second power battery pack and the drive motor. S2. When both the first power information and the second power information are lower than the power threshold, and the first power information is lower than the second power information, control the second switching module to connect the charging connection between the second power battery pack and the range extender, control the range extender to start, and control the first switching module to connect the power supply connection between the first power battery pack and the drive motor. S3. When both the first power information and the second power information are equal to or higher than the power threshold, and the first power information is higher than the second power information, control the second switching module to disconnect the charging connection of the range extender, control the range extender to stop, and control the first switching module to connect the power supply connection between the first power battery pack and the drive motor. S4. When the first power information and the second power information are both equal to or higher than the power threshold, and the first power information is lower than the second power information, control the second switching module to disconnect the charging connection of the range extender, control the range extender to stop, and control the first switching module to connect the power supply connection between the second power battery pack and the drive motor. S5. When the first power information is equal to or higher than the power threshold and the second power information is lower than the power threshold, control the second switching module to connect the range extender to the charging connection of the second power battery pack, control the range extender to start, and control the first switching module to connect the first power battery pack to the power supply connection of the drive motor. S6. When the second power information is equal to or higher than the power threshold, and the first power information is lower than the power threshold, control the second switching module to connect the range extender to the charging connection of the first power battery pack, control the range extender to start, and control the first switching module to connect the second power battery pack to the power supply connection of the drive motor.

[0027] Steps S1-S6 represent the first execution mode of the energy management method performed by the control module.

[0028] The principle of steps S1-S6 is shown in Figures 3(a)-3(f).

[0029] In this embodiment, the first and second power information in steps S1-S6 represent the real-time power levels of the first and second power battery packs, respectively. Specifically, they can be the power information most recently collected by the battery management module. The first and second power information can be in percentage form, representing the percentage of the current remaining power of each power battery pack relative to its capacity. For example, the first power information represents the percentage of the current remaining power of the first power battery pack relative to its capacity. The power threshold in steps S1-S6 can be the same value, such as 20%. When the power information is lower than the power threshold, it indicates that the current remaining power of the power battery pack is low and it is suitable for charging.

[0030] In this embodiment, the principle of step S1 is shown in Figure 3(a). Referring to Figure 3(a), when the conditions are met that "first power information < power threshold, and second power information < power threshold, and first power information > second power information", it indicates that the real-time power levels of both the first and second power battery packs are low, and both are suitable for charging. However, one power battery pack needs to discharge to power the drive motor. Referring to Figure 3(a), the control module controls the second switching module to connect the charging connection between the first power battery pack and the range extender, controls the range extender to start, thereby enabling the range extender to charge the first power battery pack with a relatively higher real-time power level, and controls the first switching module to connect the power supply connection between the second power battery pack and the drive motor, so that the second power battery pack with a relatively lower real-time power level discharges to power the drive motor.

[0031] In this embodiment, the principle of step S2 is shown in Figure 3(b). Referring to Figure 3(b), when the conditions "first power information < power threshold, and second power information < power threshold, and first power information < second power information" are met, it indicates that the real-time power levels of both the first and second power battery packs are low. Both the first and second power battery packs are suitable for charging at this time. However, one power battery pack needs to discharge to supply power to the drive motor. Referring to Figure 3(b), the control module controls the second switching module to connect the charging connection between the second power battery pack and the range extender, controls the range extender to start, thereby enabling the range extender to charge the second power battery pack with a relatively higher real-time power level, and controls the first switching module to connect the power supply connection between the first power battery pack and the drive motor, so that the first power battery pack with a relatively lower real-time power level discharges to supply power to the drive motor.

[0032] In this embodiment, by executing steps S1-S2, the following is achieved: "When the real-time charge levels of both power battery packs are low, the range extender is controlled to charge the power battery pack with the relatively higher real-time charge level, and the first switching module is controlled to discharge the power battery pack with the relatively lower real-time charge level to supply power to the drive motor." This allows for the rapid acquisition of a power battery pack with a real-time charge level closer to full charge to supply power to the drive motor, and also allows for the rapid acquisition of a power battery pack with a real-time charge level closer to depletion to be charged by the range extender. Since the power battery pack with a real-time charge level closer to full charge supplies power to the drive motor, it is beneficial for the drive motor to obtain a more sufficient power supply. The range extender charging the power battery pack with a real-time charge level closer to depletion helps the range extender to obtain a longer continuous working time, thereby improving the operating stability of the range extender. Therefore, by executing steps S1-S2, it is beneficial to obtain better vehicle power performance and lower fuel consumption per unit of the range extender.

[0033] In this embodiment, the principle of step S3 is shown in Figure 3(c). Referring to Figure 3(c), when the conditions are met that "first power information ≥ power threshold, and second power information ≥ power threshold, and first power information > second power information", it indicates that the real-time power levels of both the first and second power battery packs are high, and both the first and second power battery packs are suitable for discharge at this time without needing to be charged. Referring to Figure 3(c), the control module controls the second switching module to disconnect the charging connection of the range extender, controls the range extender to stop, and controls the first switching module to connect the power supply connection between the first power battery pack and the drive motor, so that the first power battery pack with the relatively higher real-time power level discharges to supply power to the drive motor.

[0034] In this embodiment, the principle of step S4 is shown in Figure 3(d). Referring to Figure 3(d), when the conditions are met that "the first power information ≥ the power threshold, and the second power information ≥ the power threshold, and the first power information < the second power information", it indicates that the real-time power levels of both the first and second power battery packs are high, and both are suitable for discharge without charging. Referring to Figure 3(d), the control module controls the second switching module to disconnect the charging connection of the range extender, stops the range extender, and controls the first switching module to connect the power supply connection between the second power battery pack and the drive motor, so that the second power battery pack with the relatively higher real-time power level discharges to power the drive motor.

[0035] In this embodiment, the principle of step S5 is shown in Figure 3(e). Referring to Figure 3(e), when the condition "first power information ≥ power threshold and second power information < power threshold" is met, it indicates that the real-time power of the first power battery pack is high while the real-time power of the second power battery pack is low. The first power battery pack is suitable for discharging at this time and does not need to be charged, while the second power battery pack is suitable for charging at this time. Referring to Figure 3(e), the control module controls the second switching module to connect the range extender to the charging connection of the second power battery pack, and controls the range extender to start, thereby enabling the range extender to charge the second power battery pack with the lower real-time power. The control module controls the first switching module to connect the first power battery pack to the power supply connection of the drive motor, thereby enabling the first power battery pack with the higher real-time power to supply power to the drive motor.

[0036] In this embodiment, the principle of step S6 is shown in Figure 3(f). Referring to Figure 3(f), when the condition "first power information < power threshold, and second power information ≥ power threshold" is met, it indicates that the real-time power of the first power battery pack is low while the real-time power of the second power battery pack is high. The first power battery pack is currently suitable for charging, while the second power battery pack is currently suitable for discharging without needing charging. Referring to Figure 3(f), the control module controls the second switching module to connect the range extender to the charging connection of the first power battery pack, controlling the range extender to start, thereby enabling the range extender to charge the first power battery pack with the low real-time power. The control module also controls the first switching module to connect the second power battery pack to the power supply connection of the drive motor, thereby enabling the second power battery pack with the high real-time power to supply power to the drive motor.

[0037] In this embodiment, by executing steps S3-S6, the following is achieved: "When at least one power battery pack has a high real-time charge, the range extender is controlled to charge the power battery pack with a relatively lower real-time charge, and the first switching module is controlled to discharge the power battery pack with a relatively higher real-time charge to supply power to the drive motor." This adapts to the characteristic that the power battery pack with a high real-time charge is suitable for discharging, and the power battery pack with a low real-time charge is suitable for charging, which is beneficial to fully utilize the performance of the first power battery pack and the second power battery pack.

[0038] In this embodiment, when the control module controls the charging and discharging of the first and second power battery packs in the energy management method, it can specifically perform the following steps: P1. When the second battery level is detected to be higher than the first battery level, the first process is triggered. P2. In the first process, the first switching module is controlled to connect the power supply between the second power battery pack and the drive motor, and the range extender is controlled to stop until the second power information drops to the minimum power limit, triggering the execution of the second process; the minimum power limit is not lower than the current first power information; P3. In the second process, the first switching module is controlled to connect the power supply connection between the first power battery pack and the drive motor, the battery pack direct charging module is controlled to connect the charging connection between the first power battery pack and the second power battery pack, and the range extender is controlled to stop until the first power information drops to zero, triggering the execution of the third process; P4. In the third process, the first switching module is controlled to connect the power supply connection between the second power battery pack and the drive motor, the battery pack direct charging module is controlled to disconnect the charging connection between the first power battery pack and the second power battery pack, and the range extender is controlled to start until the first power information rises to the logical available capacity of the first power battery pack, and then the first process is executed.

[0039] Steps P1-P4 represent the second execution mode of the energy management method performed by the control module.

[0040] The principle of steps P1-P4 is shown in Figures 4(a)-4(c).

[0041] In this embodiment, when performing steps P1-P4, the only charging target of the range extender is the first power battery pack. That is, the range extender does not need to be connected to the second power battery pack. Therefore, there is no need to set up a second switching module, and the range extender can be directly connected to the first power battery pack. When the range extender starts, it charges the first power battery pack, and when the range extender stops, it stops charging the first power battery pack.

[0042] In this embodiment, in order to obtain better execution results, a second power battery pack with a relatively high logical available capacity and a first power battery pack with a relatively low logical available capacity can be used as the basis for executing steps P1-P4. The logical available capacity of the second power battery pack is the maximum amount of electricity it can store, specifically expressed in kWh (kilowatt-hours). The logical available capacity can be equal to the physical available capacity (i.e., the maximum amount of electricity the second power battery pack can store, determined by factors such as its materials, manufacturing process, and structure). Alternatively, the battery management module can configure the logical available capacity to be less than the physical available capacity. (Specifically, the battery management module manages the charging of the second power battery pack and tracks the amount of electricity charged. When it detects that the remaining electricity in the second power battery pack has reached its logical available capacity, even if the physical available capacity is larger and it can actually store more energy, the battery management module prohibits further charging.) Similarly, the first power battery pack also has a physical available capacity and a logical available capacity. The logical available capacity can be equal to the physical available capacity, or the charging of the first power battery pack can be restricted through the battery management module, making its logical available capacity less than its physical available capacity.

[0043] In this embodiment, the example is taken as the logical available capacity of the first power battery pack and the second power battery pack being equal to their respective physical available capacity. That is, a first power battery pack with a lower physical available capacity (generally corresponding to smaller size, less space occupied, and easier to disassemble) is used, i.e., a "small battery" is used as the first power battery pack, and a second power battery pack with a higher physical available capacity (generally corresponding to larger size, more space occupied, and more suitable for long-term installation and fixation in a car) is used, i.e., a "large battery" is used as the second power battery pack.

[0044] Specifically, in this embodiment, the logical available capacity (physical available capacity) of the first power battery pack can be a smaller value (e.g., 25%) relative to the logical available capacity (physical available capacity) of the second power battery pack. For example, the logical available capacity (physical available capacity) of the first power battery pack is 20kWh, and the logical available capacity (physical available capacity) of the second power battery pack is 80kWh.

[0045] In steps P1-P4, the first and second battery capacity information can be expressed as absolute values ​​(i.e., values ​​in kWh) rather than as percentages relative to the maximum capacity of the power battery.

[0046] In this embodiment, the second power battery pack is a large battery and the first power battery pack is a small battery. Therefore, in step P1, there is a high probability that relatively high second power information and relatively low second power information will be detected, thereby triggering the execution of the first process.

[0047] In this embodiment, the first process is step P2, and its principle is shown in Figure 4(a). Referring to Figure 4(a), the control module can first set a minimum power limit based on the current first power information and the second power information (when step P2 is just started). For example, it can calculate the average of the current first power information and the second power information as the minimum power limit, or use the current second power information as the minimum power limit.

[0048] Since the current second battery level is high and the first battery level is low, the control module controls the first switching module to connect the power supply between the second power battery pack and the drive motor, and controls the range extender to stop. In this way, during the entire first process, the second power battery pack supplies power to the drive motor, while the range extender does not work, meaning the first power battery pack is not charged. As the first process continues, the second battery level of the second power battery pack will continue to decrease. The control module monitors the second battery level in real time through the battery management module. Once the second battery level is detected to have decreased to the minimum battery level limit, the first process ends and the second process is triggered.

[0049] In this embodiment, the second process is step P3, and its principle is shown in Figure 4(b). Referring to Figure 4(b), at the beginning of the second process, the second charge information of the second power battery pack drops to the minimum charge limit. The control module controls the first switching module to connect the power supply connection between the first power battery pack and the drive motor, controls the battery pack direct charging module to connect the charging connection between the first power battery pack and the second power battery pack, and controls the range extender to stop. That is, the range extender does not work, and the first power battery pack will not receive power from the range extender for charging. Instead, the first power battery pack discharges to supply power to the drive motor and also discharges to supply power to the battery pack direct charging module. That is, a portion of the power output from the first power battery pack is used to supply power to the drive motor and convert it into power to drive the vehicle. The other portion of the power output from the first power battery pack is charged into the second power battery pack, so that the second charge information of the second power battery pack starts from the minimum charge limit and continues to rise throughout the second process.

[0050] As the second process continues, the first power battery pack's first power charge information will continue to decrease. The control module monitors the first power charge information in real time through the battery management module. Once the first power charge information is detected to decrease to zero (specifically, it can be a protection limit, that is, when the first power charge information decreases to zero, the first power battery pack still actually stores a certain amount of power), the execution of the second process ends and the execution of the third process is triggered.

[0051] In this embodiment, the third process is step P4, and its principle is shown in Figure 4(c). Referring to Figure 4(c), at the beginning of the third process, the first power battery pack's first charge information drops to zero, while the second power battery pack's second charge information rises to a higher value. The control module controls the first switching module to connect the power supply connection between the second power battery pack and the drive motor, controls the battery pack direct charging module to disconnect the charging connection between the first and second power battery packs, and controls the range extender to start, i.e., the range extender works. The first power battery pack receives power from the range extender's output for charging, while the second power battery pack continues to discharge and only supplies power to the drive motor. The second power battery pack no longer charges the first power battery pack.

[0052] As the third process continues, because a smaller battery is used as the first power battery pack, the first power battery pack's charge level will rise rapidly to its logical available capacity (i.e., a fully charged or high SOC state). Since a larger battery is used as the second power battery pack, even if the first power battery pack's charge level decreases during the third process, it will remain higher than the first charge level at the end of the third process, thus satisfying the triggering condition in step P1 again and triggering the first process again. Therefore, steps P1-P4, the first, second, and third processes, form a loop that can be continuously executed.

[0053] In this embodiment, the principle of executing steps P1-P4 is as follows: Referring to Figures 4(a)-4(c), by executing the first process, the second power battery pack's second power information can be reduced to a relatively low value (minimum power limit), thus providing space for the transfer of electrical energy stored in the first power battery pack to the second power battery pack in the subsequent second process; by executing the second process, the transfer of electrical energy stored in the first power battery pack to the second power battery pack can be realized, and in the second process, the first power battery pack undertakes the high-load discharge task; by executing the third process, the range extender can replenish electrical energy to the first power battery pack, and the second power battery pack takes over the task of powering the drive motor from the first power battery pack; the third process can be connected with the first process, thereby continuously executing the first process and the second process. The process consists of two stages: the first stage and the third stage. Referring to Figures 4(a)-4(c), it can be seen that only the third stage activates the range extender. Therefore, the range extender's operation has good continuity, and the charging target of the range extender is always only the first power battery pack. Thus, the operating condition of the range extender has good predictability, making it easy to configure the range extender to operate within a high-efficiency range of parameters such as speed, which is beneficial to improving the working efficiency of the range extender. Moreover, the first power battery pack with a small battery capacity undertakes the high-load discharge task, while the second power battery pack with a large battery capacity maintains a high second charge information throughout the process. This helps to reduce the discharge cycle number of the second power battery pack, thereby reducing the maintenance workload of the second power battery pack and transferring the maintenance workload to the more easily maintained first power battery pack, which helps to reduce maintenance costs.

[0054] In this embodiment, a first and second power battery pack with the same physical available capacity can also be used. For example, two power battery packs of the same model can be used as the first and second power battery packs. By configuring the first and second power battery packs by the battery management module, the first power battery pack can obtain a lower logical available capacity, while the second power battery pack can obtain a higher logical available capacity. In this case, the battery management module can periodically swap the configurations of the two power battery packs, so that the previous first power battery pack is configured as the new second power battery pack, and the previous second power battery pack is configured as the new first power battery pack, thereby achieving a relative load balance between the two power battery packs.

[0055] In this embodiment, a heat dissipation module, such as a cooling water pipe, can be installed between the first and second power battery packs. The first and second power battery packs can share the same heat dissipation module. This module dissipates heat from the first and second power battery packs, reducing the likelihood of damage due to overheating.

[0056] In this embodiment, a range-extended powertrain system with dual battery packs can be installed on a vehicle, forming an integrated whole with other components. Such a vehicle possesses all the technical benefits of a range-extended powertrain system with dual battery packs.

[0057] It should be noted that, unless otherwise specified, when a feature is referred to as "fixed" or "connected" to another feature, it can be directly fixed or connected to the other feature, or indirectly fixed or connected to the other feature. Furthermore, the descriptions of "upper," "lower," "left," and "right" used in this disclosure are only relative to the relative positional relationships of the components of this disclosure in the accompanying drawings. The singular forms "a" and "the" used in this disclosure are also intended to include the plural forms, unless the context clearly indicates otherwise. Moreover, unless otherwise defined, all technical and scientific terms used in this embodiment have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this embodiment specification is only for describing specific embodiments and is not intended to limit the embodiments of the invention. The term "and / or" as used in this embodiment includes any combination of one or more of the associated listed items.

[0058] It should be understood that although the terms first, second, third, etc., may be used to describe various elements in this disclosure, these elements should not be limited to these terms. These terms are only used to distinguish elements of the same type from each other. For example, a first element may also be referred to as a second element without departing from the scope of this disclosure, and similarly, a second element may also be referred to as a first element. The use of any and all instances or exemplary language (“e.g.,” “such as,” etc.) provided in this embodiment is intended only to better illustrate embodiments of the invention and, unless otherwise required, does not impose a limitation on the scope of embodiments of the invention.

[0059] It should be recognized that embodiments of the present invention can be implemented or carried out by computer hardware, a combination of hardware and software, or by computer instructions stored in a non-transitory computer-readable storage medium. The method can be implemented using standard programming techniques—including a non-transitory computer-readable storage medium configured with a computer program, wherein such a storage medium causes the computer to operate in a specific and predefined manner—according to the methods and drawings described in the specific embodiments. Each program can be implemented in a high-level procedural or object-oriented programming language to communicate with the computer system. However, if desired, the program can be implemented in assembly or machine language. In any case, the language can be a compiled or interpreted language. Furthermore, for this purpose, the program can run on a programmed application-specific integrated circuit (ASIC).

[0060] Furthermore, the procedures described in this embodiment can be performed in any suitable order unless otherwise indicated by this embodiment or otherwise obviously contradict the context. The procedures (or variations and / or combinations thereof) described in this embodiment can be executed under the control of one or more computer systems configured with executable instructions, and can be implemented by hardware or a combination thereof as code (e.g., executable instructions, one or more computer programs, or one or more applications) that commonly executes on one or more processors. A computer program includes a plurality of instructions executable by one or more processors.

[0061] Furthermore, the method can be implemented in any suitable type of computing platform, including but not limited to personal computers, minicomputers, mainframes, workstations, networked or distributed computing environments, standalone or integrated computer platforms, or in communication with charged particle tools or other imaging devices, etc. Aspects of embodiments of the invention can be implemented as machine-readable code stored on a non-transitory storage medium or device, whether removable or integrated into a computing platform, such as a hard disk, optical read and / or write storage medium, RAM, ROM, etc., such that it is readable by a programmable computer, and when the storage medium or device is read by the computer, it can be used to configure and operate the computer to perform the processes described herein. Furthermore, the machine-readable code, or portions thereof, can be transmitted via wired or wireless networks. The invention of this embodiment includes these and other different types of non-transitory computer-readable storage media when such media comprises instructions or programs that implement the steps above in conjunction with a microprocessor or other data processor. Embodiments of the invention also include the computer itself when programmed according to the methods and techniques of embodiments of the invention.

[0062] A computer program can be applied to input data to perform the functions of this embodiment, thereby transforming the input data to generate output data stored in non-volatile memory. The output information can also be applied to one or more output devices, such as a display. In a preferred embodiment of the invention, the transformed data represents physical and tangible objects, including a specific visual depiction of physical and tangible objects generated on the display.

[0063] The above are merely preferred embodiments of the present invention. The embodiments of the present invention are not limited to the above-described implementations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the embodiments of the present invention, as long as they achieve the same technical effects, should be included within the scope of protection of the embodiments of the present invention. Within the scope of protection of the embodiments of the present invention, the technical solutions and / or implementation methods can have various modifications and variations.

Claims

1. A range extended power system having dual power battery packs, characterized by, The range-extending power system with double power battery packs comprises: a first power battery pack; a second power battery pack; a drive motor, which is configured to receive power supply and output automobile driving force; a first switching module, which is configured to selectively connect the first power battery pack and the second power battery pack to the drive motor for power supply; a range extender, which is configured to generate power to charge the first power battery pack and / or the second power battery pack; a control module, which is configured to control the charging and discharging of the first power battery pack and the second power battery pack.

2. The range extended power system with dual power battery packs of claim 1, wherein, The range-extending power system with double power battery packs further comprises: a battery management module, which is configured to detect first power information of the first power battery pack and second power information of the second power battery pack; a battery pack direct charging module, which is configured to, after connecting the first power battery pack to the second power battery pack for charging, discharge the first power battery pack to charge the second power battery pack.

3. The range extended power system with dual power battery packs of claim 2, wherein, The range-extending power system with double power battery packs further comprises: a second switching module, which is configured to selectively connect the first power battery pack and the second power battery pack to the range extender for charging.

4. The range extended power system with dual power battery packs of claim 3, wherein, The control of the charging and discharging of the first power battery pack and the second power battery pack comprises: when the first power information and the second power information are both lower than a power threshold, and the first power information is higher than the second power information, controlling the second switching module to connect the first power battery pack to the range extender for charging, controlling the range extender to start, and controlling the first switching module to connect the second power battery pack to the drive motor for power supply; when the first power information and the second power information are both lower than a power threshold, and the first power information is lower than the second power information, controlling the second switching module to connect the second power battery pack to the range extender for charging, controlling the range extender to start, and controlling the first switching module to connect the first power battery pack to the drive motor for power supply; when the first power information and the second power information are both equal to or higher than a power threshold, and the first power information is higher than the second power information, controlling the second switching module to disconnect the range extender for charging, controlling the range extender to stop, and controlling the first switching module to connect the first power battery pack to the drive motor for power supply; when the first power information and the second power information are both equal to or higher than a power threshold, and the first power information is lower than the second power information, controlling the second switching module to disconnect the range extender for charging, controlling the range extender to stop, and controlling the first switching module to connect the second power battery pack to the drive motor for power supply; When the first electric quantity information is equal to or higher than the electric quantity threshold value and the second electric quantity information is lower than the electric quantity threshold value, the second switching module is controlled to connect the range extender and the second power battery pack for charging, the range extender is controlled to start, and the first switching module is controlled to connect the first power battery pack and the driving motor for power supply. When the second electric quantity information is equal to or higher than the electric quantity threshold value and the first electric quantity information is lower than the electric quantity threshold value, the second switching module is controlled to connect the range extender and the first power battery pack for charging, the range extender is controlled to start, and the first switching module is controlled to connect the second power battery pack and the driving motor for power supply.

5. The range-extending power system with double power battery packs according to claim 2, wherein: the logical available capacity of the second power battery pack is higher than the logical available capacity of the first power battery pack.

6. The range extended power system with dual power battery packs of claim 5, wherein, The control of the charging and discharging of the first power battery pack and the second power battery pack comprises: when the second electric quantity information is detected to be higher than the first electric quantity information, a first process is triggered to be executed; in the first process, the first switching module is controlled to connect the second power battery pack and the driving motor for power supply, the range extender is controlled to stop, and until the second electric quantity information decreases to a minimum electric quantity limit value, a second process is triggered to be executed; the minimum electric quantity limit value is not lower than the current first electric quantity information; in the second process, the first switching module is controlled to connect the first power battery pack and the driving motor for power supply, the battery pack direct charging module is controlled to connect the first power battery pack and the second power battery pack for charging, and the range extender is controlled to stop, and until the first electric quantity information decreases to zero, a third process is triggered to be executed; in the third process, the first switching module is controlled to connect the second power battery pack and the driving motor for power supply, the battery pack direct charging module is controlled to disconnect the first power battery pack and the second power battery pack for charging, and the range extender is controlled to start, and until the first electric quantity information increases to the logical available capacity of the first power battery pack, the first process is executed.

7. The range-extending power system with double power battery packs according to claim 5, wherein: the logical available capacity of the first power battery pack is equal to the physical available capacity of the first power battery pack, and the logical available capacity of the second power battery pack is equal to the physical available capacity of the second power battery pack; the physical available capacity of the second power battery pack is higher than the physical available capacity of the first power battery pack.

8. The range-extending power system with double power battery packs according to claim 5, wherein: the physical available capacity of the second power battery pack is equal to the physical available capacity of the first power battery pack. The battery management module configures the logical available capacity of the first power battery pack to be lower than the physical available capacity of the first power battery pack, and configures the logical available capacity of the second power battery pack to be equal to the physical available capacity of the second power battery pack.

9. The range extended power system with dual power battery pack according to any one of claims 1-8, characterized in that, The range-extending power system with dual power battery packs further comprises: A heat dissipation module, which is used for dissipating heat of the first power battery pack and the second power battery pack.

10. An automobile characterized by comprising: The automobile comprises the range-extending power system with dual power battery packs according to any one of claims 1-9.

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