A dual power battery system based on range extender without power switching

Abstract

The utility model provides a dual power battery system based on a range extender without power switching, which relates to the technical field of new energy vehicles, including: a driving motor is connected to a load, the load is respectively connected to a first switch KD and a second switch KF, the first switch KD is respectively connected to a range extender component and a third switch KC, the third switch KC is respectively connected to a fourth switch KC1 and a fifth switch KC2, the fourth switch KC1 is connected to a first power battery, the fifth switch KC2 is connected to a second power battery, the second switch KF is respectively connected to a sixth switch KF1 and a seventh switch KF2, the sixth switch KF1 is connected to the first power battery, and the seventh switch KF2 is connected to the second power battery. The utility model solves the problem that the power battery cannot be charged and discharged simultaneously during driving.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy vehicles, and in particular to a dual power battery system based on a range extender with uninterrupted power switching. Background Art

[0002] With the improvement of global environmental protection awareness and the transformation of energy structure, new energy vehicles have become an important development direction of the automobile industry. At present, new energy vehicles on the market generally adopt a single power battery power supply mode, of which pure electric vehicles and extended-range vehicles are the two mainstream types. However, both types of vehicles have significant limitations and shortcomings in their power supply systems.

[0003] For pure electric vehicles, their driving power and system power supply are completely dependent on a single power battery. When the power battery or its main circuit fails, the vehicle will immediately lose power and the entire vehicle system will lose power, which will pose an unavoidable power system safety risk and seriously threaten driving safety and system reliability.

[0004] As for conventional extended-range vehicles with a single power battery, although the output power of the range extender can still be relied on to maintain vehicle driving and system power supply when the power battery or its main circuit fails, the output power of the range extender is generally much lower than that of the power battery, which significantly reduces the vehicle power, and it is impossible to restore the vehicle power to the state before the power battery fails through internal adjustments. Furthermore, due to the electrochemical characteristics of lithium batteries, the power battery cannot be charged and discharged at the same time. When the power battery is depleted and enters the charging state, it can no longer discharge to provide driving power. At this time, it can only rely on the output power of the range extender to maintain vehicle driving and system power supply. In addition, part of the output power of the range extender is used to charge the depleted power battery, making the driving power lower than when the power battery fails, which seriously limits the performance and the user experience is extremely poor. In addition, the low-power control strategy of the extended-range vehicle is generally more complicated. The frequent charging and discharging of the power battery in a shorter charging and discharging threshold range according to the strategy will not only accelerate the local attenuation and aging of the battery, greatly shortening the battery life, but also cause the power distribution to be frequently adjusted, which will have an adverse impact on the stability of the system and pose a safety hazard. Frequent starting and stopping of the range extender and adjusting the output power of the range extender will also bring a bad experience to users. More importantly, the original design intention of the extended-range system is that the power battery is completely used to provide driving power, and the range extender only replenishes the power of the low-power power battery. However, the existing extended-range system generally has the range extender directly providing the low-power driving power, and the power battery is relegated to the second line. This is contrary to the original design intention and cannot fully exert the capabilities and effects of the extended-range system. It even leads to misunderstandings and criticisms that the extended-range vehicle is classified as an excessive product of new energy vehicle development and a useless product.

[0005] Therefore, a dual power battery system based on range extender with continuous power switching is proposed. Utility Model Content

[0006] This specification provides a dual power battery system based on a range extender with uninterrupted power switching, which enables one set of power batteries to be discharged while another set of power batteries is charged, solving the problem that the power batteries cannot be charged and discharged simultaneously during driving.

[0007] This specification provides a dual power battery system based on range extender without power switching, including:

[0008] Drive motor, range extender assembly, first power battery, second power battery, load, first switch KD, second switch KF, third switch KC, fourth switch KC1, fifth switch KC2, sixth switch KF1, seventh switch KF2;

[0009] The drive motor is connected to the load, and the load is respectively connected to the first switch KD and the second switch KF, the first switch KD is respectively connected to the range extender component and the third switch KC, the third switch KC is respectively connected to the fourth switch KC1 and the fifth switch KC2, the fourth switch KC1 is connected to the first power battery, the fifth switch KC2 is connected to the second power battery, the second switch KF is respectively connected to the sixth switch KF1 and the seventh switch KF2, the sixth switch KF1 is connected to the first power battery, and the seventh switch KF2 is connected to the second power battery.

[0010] Optionally, the range extender assembly includes a generator connected between the first switch KD and the third switch KC, and an engine connected to the generator.

[0011] Optional, including:

[0012] When the power level of the first power battery is higher than the first preset value and the power level of the second power battery is lower than the second preset value, the fourth switch KC1 is disconnected, the first power battery exits the charging state, the first switch KD is closed, the range extender component is continuously started to replace the second power battery to provide driving power for the drive motor and power the load, the seventh switch KF2 is disconnected, the second power battery exits the discharging state, the second switch KF is closed, the sixth switch KF1 is closed, the first power battery enters the discharging state to provide driving power for the drive motor and power the load, the first switch KD is disconnected, the third switch KC is closed, the fifth switch KC2 is closed, and the second power battery enters the charging state.

[0013] Optional, including:

[0014] When the power level of the first power battery is lower than the second preset value and the power level of the second power battery is higher than the first preset value, the fifth switch KC2 is disconnected, the second power battery exits the charging state, the first switch KD is closed, the range extender component is continuously started to replace the first power battery to provide driving power for the drive motor and power the load, the sixth switch KF1 is disconnected, the first power battery exits the discharging state, the second switch KF is closed, the seventh switch KF2 is closed, the second power battery enters the discharging state to provide driving power for the drive motor and power the load, the first switch KD is disconnected, the third switch KC is closed, the fourth switch KC1 is closed, and the first power battery enters the charging state.

[0015] Optional, including:

[0016] When the voltages of both the first power battery and the second power battery are lower than the second preset value, the first switch KD is closed, the range extender component is started to provide driving power for the drive motor and power the load, the second switch KF, the sixth switch KF1, the seventh switch KF2, and the fifth switch KC2 are all disconnected, the third switch KC is closed, and the fourth switch KC1 is closed, the range extender component charges the first power battery, and the second power battery is on standby.

[0017] Optional, including:

[0018] When the voltages of the first power battery and the second power battery are both higher than the first preset value, the third switch KC, the fourth switch KC1, the fifth switch KC2, and the seventh switch KF2 are all disconnected, the second switch KF and the sixth switch KF1 are both closed, the first power battery enters a discharge state to provide driving power for the drive motor and power the load, and the second power battery is in a standby state.

[0019] Optional, including:

[0020] When the second power battery fails and the first power battery is higher than the first preset value, the third switch KC is disconnected, the first switch KD is closed, the range extender assembly is started, the fifth switch KC2 and the seventh switch KF2 are both disconnected, the second power battery exits operation, and the dual power battery switching is locked until the second power battery returns to normal; the fourth switch KC1 is disconnected, the second switch KF and the sixth switch KF1 are both closed, the range extender assembly is turned off, the first switch KD is disconnected, and the first power battery enters a discharge state to provide driving power for the drive motor and power the load;

[0021] or,

[0022] When the first power battery fails and the power level of the second power battery is higher than the first preset value, the third switch KC is disconnected, the first switch KD is closed, the range extender component is started, the fourth switch KC1 and the sixth switch KF1 are both disconnected, the first power battery exits operation, and the dual power battery switching is locked until the first power battery returns to normal; the fifth switch KC2 is disconnected, the second switch KF and the seventh switch KF2 are both closed, the range extender component is turned off, the first switch KD is disconnected, and the second power battery enters a discharge state to provide driving power for the drive motor and power the load.

[0023] Optional, including:

[0024] When the first power battery fails and the power of the second power battery is lower than the second preset value, the third switch KC is disconnected, the first switch KD is closed, the range extender component starts to provide driving power for the drive motor and power the load, the fourth switch KC1 and the sixth switch KF1 are both disconnected, the first power battery exits operation, and the dual power battery switching is locked until the first power battery returns to normal; the second switch KF and the seventh switch KF2 are both disconnected, the third switch KC and the fifth switch KC2 are both closed, and the range extender component provides driving power for the drive motor and charges the second power battery;

[0025] or,

[0026] When the second power battery fails and the power level of the first power battery is lower than the second preset value, the third switch KC is disconnected, the first switch KD is closed, the range extender component starts to provide driving power for the drive motor and power the load, the fifth switch KC2 and the seventh switch KF2 are both disconnected, the second power battery exits operation, and the dual power battery switching is locked until the second power battery returns to normal; the second switch KF and the sixth switch KF1 are both disconnected, the third switch KC and the fourth switch KC1 are both closed, and the range extender component provides driving power for the drive motor and charges the first power battery.

[0027] Optional, including:

[0028] When both the first power battery and the second power battery fail, the third switch KC is disconnected, the first switch KD is closed, the range extender component is started to provide driving power for the drive motor and power the load, the second switch KF, the fourth switch KC1, the sixth switch KF1, the fifth switch KC2, and the seventh switch KF2 are all disconnected, and the first power battery and the second power battery are both out of operation.

[0029] Optional, including:

[0030] When the range extender component fails or the fuel is exhausted and cannot be replenished, and the power level of the first power battery is higher than the first preset value, the dual power battery switching function is disabled, the first switch KD, the third switch KC, and the seventh switch KF2 are all disconnected, and the second switch KF and the sixth switch KF1 are all closed, the first power battery operates independently to provide driving power for the drive motor and power the load, and the dual power battery switching function is disabled.

[0031] The utility model optimizes and improves on the basis of the conventional extended-range automobile power system structure, and is based on the intelligent automatic switching of two groups of power batteries and their charging and discharging states during vehicle driving, so that one group of power batteries can be discharged while the other group of power batteries can be charged, solving the problem that a single power battery cannot be charged and discharged at the same time; when the power battery used for driving is low on power and needs to be charged, the other group of power batteries with sufficient power will be automatically switched to a discharged state to provide driving power, and the two groups of power batteries will be fully utilized to switch alternately in time to provide reliable and stable full-effect driving power; when the power battery is low on power, the range extender will no longer provide driving power, solving the problem that the vehicle power is significantly reduced when the power is low on power; after the improvement, the charging process of the power battery is evenly distributed to the driving process, ensuring that the range extender continuously charges the power battery with a suitable and balanced output power, preventing jitter and noise caused by frequent starting and stopping and overload operation of the range extender, and significantly improving the overall performance and user experience. In addition, when a group of power batteries or their main circuits fail, it can also automatically switch to another group of normal power batteries for operation, avoiding the problem of vehicle stalling and power loss or sharp power drop when the power battery or its main circuit fails in the single power battery system, significantly improving the system's risk resistance and emergency response capabilities, and more comprehensively ensuring the safety and reliability of the vehicle. After the improvement, the original design of the extended-range system, which uses power batteries to provide power and the range extender only assists in energy storage, has been returned to the original design of the extended-range system, which retains the original advantages of basic reliability and no anxiety about endurance, and also has the complete power performance of pure electric vehicles and the same driving experience as pure electric vehicles, giving full play to the capabilities and effects of the extended-range system, and its advantages are more prominent than those of pure electric vehicles. In order to solve the problem of short-term stalling and power loss at the moment of switching between the two groups of power batteries during driving, the system takes measures to ensure seamless switching by having the range extender take over to maintain driving power and system power supply before the power battery is switched, so as to ensure power failure at the moment of switching and during the whole process, and improve the reliability and stability of switching. In addition, the two groups of power batteries are strictly prohibited from being parallel during the switching process to avoid the instability factors that may be caused by the parallel power batteries. The utility model adopts a dual power battery intelligent switching structure to replace the original complex low-power strategy, so that the two groups of power batteries are fully charged and discharged in turn during normal driving, and provide driving power alternately. The low-power strategy is only needed under special abnormal circumstances such as one group of power batteries fails or two groups of power batteries are simultaneously low-powered. The power distribution disorder caused by frequent adjustments triggered by the complex low-power strategy is avoided as much as possible, and power collapse and failure caused by accelerated attenuation and aging due to frequent local charging and discharging of the power battery is prevented.

[0032] The utility model is improved on the basis of retaining the original extended-range system structure as much as possible. The power battery involved is kept consistent with the original single power battery in terms of appearance, size and structure as much as possible, and is only divided into two independent groups in the internal structure to improve the operability of the improvement and reduce the cost of transformation and transplantation. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present application. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0034] Figure 1 A schematic diagram of the structure of a dual power battery system based on non-stop power switching of a range extender provided in an embodiment of this specification.

[0035] The accompanying drawings illustrate: 1. driving motor; 2. range-extending component; 21. generator; 22. engine; 3. first power battery; 4. second power battery; 5. load. DETAILED DESCRIPTION

[0036] The following description is used to disclose the utility model so that those skilled in the art can implement the utility model. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles of the utility model defined in the following description can be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not deviate from the spirit and scope of the utility model.

[0037] The following is combined with Figure 1 The exemplary embodiments of the present invention are described more fully. However, the exemplary embodiments can be implemented in various forms, and it should not be understood that the present invention is limited to the embodiments set forth herein. On the contrary, providing these exemplary embodiments can make the present invention more comprehensive and complete, and it is more convenient to fully convey the concept of the utility model to those skilled in the art. The same reference numerals in the figures represent the same or similar elements, components or parts, and thus their repeated description will be omitted.

[0038] Under the premise of conforming to the technical concept of the present invention, the features, structures, characteristics or other details described in a specific embodiment do not exclude that they can be combined in one or more other embodiments in a suitable manner.

[0039] In the description of specific embodiments, the features, structures, characteristics or other details described in the present invention are intended to enable those skilled in the art to fully understand the embodiments. However, it does not exclude that those skilled in the art can practice the technical solution of the present invention without one or more of the specific features, structures, characteristics or other details.

[0040] The flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all the contents and operations / steps, nor do they necessarily have to be executed in the order described. For example, some operations / steps can be decomposed, and some operations / steps can be combined or partially combined, so the actual execution order may change according to actual conditions.

[0041] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities may be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0042] The term "and / or" or "and / or" includes all combinations of any one or more of the associated listed items.

[0043] Reference Figure 1 This specification provides a dual power battery system based on range extender without power switching, including:

[0044] Driving motor 1, range extender component 2, first power battery 3, second power battery 4, load 5, first switch KD, second switch KF, third switch KC, fourth switch KC1, fifth switch KC2, sixth switch KF1, seventh switch KF2, the range extender component 2 includes a generator 21 connected between the first switch KD and the third switch KC, and an engine 22 connected to the generator 21, the generator 21 of the range extender component 2 can charge two power batteries through the third switch KC, or directly power the driving motor 1 through the first switch KD. The drive motor 1 is connected to the load 5 after DC / DC step-down, and the load 5 after DC / DC step-down is connected to the first switch KD and the second switch KF respectively. The first switch KD is connected to the range extender component 2 and the third switch KC respectively. The third switch KC is connected to the fourth switch KC1 and the fifth switch KC2 respectively. The fourth switch KC1 is connected to the first power battery 3, and the fifth switch KC2 is connected to the second power battery 4. The second switch KF is connected to the sixth switch KF1 and the seventh switch KF2 respectively. The sixth switch KF1 is connected to the first power battery 3, and the seventh switch KF2 is connected to the second power battery 4. One of the two power batteries can supply power to the drive motor 1 through the second switch KF. The range extender component can charge one of the two power batteries through the third switch. The range extender component can be put into use first before the power battery is switched through the first switch KD. Switches KC1, KC2, KF1, and KF2 allow selective charging to or discharge from one of the two power batteries.

[0045] The system is also provided with a control unit, such as a monitoring battery management system BMS, to monitor the power and fault status of the first power battery 3 and the second power battery 4, such as a monitoring control ECU, to monitor the status of the range extender component, to start or shut down the range extender component as needed, and to control the on and off states of each switch according to preset logical conditions. The control unit monitors the power, charge and discharge voltage and other state quantities of the first power battery 3 and the second power battery 4, and the first preset value and the second preset value can be adjusted according to actual conditions.

[0046] When the control unit detects that the power of the first power battery 3 is higher than the first preset value and the power of the second power battery 4 is lower than the second preset value, it is determined that the power of the first power battery 3 is sufficient, the fourth switch KC1 is disconnected, the first power battery 3 exits the charging state, the first switch KD is closed, the range extender component 2 is continuously started to replace the second power battery 4 to provide driving power for the drive motor 1 and power the load 5, the seventh switch KF2 is disconnected, the second power battery 4 exits the discharge state, the second switch KF is closed, the sixth switch KF1 is closed, the first power battery 3 enters the discharge state to provide driving power for the drive motor 1 and power the load 5, the first switch KD is disconnected, the third switch KC is closed, the fifth switch KC2 is closed, and the second power battery 4 enters the charging state. The above process is a power-deficient switching process. After this process, the first power battery 3 with sufficient power continues to provide full-effect driving power, which solves the problem that the conventional single power battery range extender system cannot continue to provide driving power by the power battery when the power battery is deficient, and the power is significantly reduced.

[0047] When the control unit detects that the power of the first power battery 3 is lower than the second preset value and the power of the second power battery 4 is higher than the first preset value, it is determined that the power of the second power battery 4 is sufficient, the fifth switch KC2 is disconnected, the second power battery 4 exits the charging state, the first switch KD is closed, the range extender component 2 continues to start to replace the first power battery 3 to provide driving power for the drive motor 1 and power the load 5, the sixth switch KF1 is disconnected, the first power battery 3 exits the discharge state, the second switch KF is closed, the seventh switch KF2 is closed, the second power battery 4 enters the discharge state to provide driving power for the drive motor 1 and power the load 5, the first switch KD is disconnected, the third switch KC is closed, the fourth switch KC1 is closed, and the first power battery 3 enters the charging state. The above process is a power-deficient switching process. After this process, the second power battery 4 with sufficient power continues to provide full-effect driving power, which solves the problem that the conventional single power battery range extender system cannot continue to provide driving power by the power battery when the power battery is deficient, and the power is significantly reduced.

[0048] When the control unit detects that the first power battery 3 and the second power battery 4 are both lower than the second preset value, the first switch KD is closed, the range extender component 2 is started to provide driving power for the drive motor 1 and power the load 5, the second switch KF, the sixth switch KF1, the seventh switch KF2, and the fifth switch KC2 are all disconnected, the third switch KC is closed, and the fourth switch KC1 is closed, the range extender component 2 charges the first power battery 3, and the second power battery 4 is on standby. After the above process, the system is in low-efficiency operation. When the first power battery 3 and the second power battery 4 are both depleted but the range extender has been refueled, the basic driving power can still be maintained through the range extender, and the first power battery 3 is charged at the same time to prevent potential damage caused by excessive discharge of the battery, which helps to extend the service life of the power battery. Of course, the system reminds you to connect to an external charger as soon as possible to replenish energy.

[0049] When the control unit detects that the first power battery 3 and the second power battery 4 are both higher than the first preset value, the third switch KC, the fourth switch KC1, the fifth switch KC2, and the seventh switch KF2 are all disconnected, the second switch KF and the sixth switch KF1 are all closed, and the first power battery 3 enters the discharge state to provide driving power for the drive motor 1 and power the load 5, and the second power battery 4 is on standby. The above process is generally the initial process after external charging. At this time, the first power battery 3 and the second power battery 4 are both sufficient in power. The first power battery 3 is used as the initial power source first and starts running. By managing and coordinating the reasonable use and timely switching of the two groups of power batteries, the vehicle is kept running with the full power output of the power battery.

[0050] When the control unit detects that the second power battery 4 fails and the first power battery 3 is higher than the first preset value, the third switch KC is disconnected, the first switch KD is closed, the range extender component 2 is started, the fifth switch KC2 and the seventh switch KF2 are both disconnected, the second power battery 3 exits operation, and the dual power battery switching is locked until the second power battery 4 returns to normal; the fourth switch KC1 is disconnected, the second switch KF and the sixth switch KF1 are both closed, the range extender component 2 is closed, the first switch KD is disconnected, and the first power battery 3 enters the discharge state to provide driving power for the drive motor 1 and power the load 5. The above process is a fault response process. Even if the faulty second power battery 4 is removed first, the vehicle can still rely on the normal first power battery 3 to continue to run without power reduction, thereby improving the safety and reliability of the system. Of course, the system needs to issue a fault warning to prompt that the second power battery 4 has failed and prompts to repair or replace it as soon as possible.

[0051] When the control unit detects that the first power battery 3 fails and the second power battery 4 is higher than the first preset value, the third switch KC is disconnected, the first switch KD is closed, the range extender component 2 is started, the fourth switch KC1 and the sixth switch KF1 are both disconnected, the first power battery 3 exits operation, and the dual power battery switching is locked until the first power battery 3 returns to normal; the fifth switch KC2 is disconnected, the second switch KF and the seventh switch KF2 are both closed, the range extender component 2 is closed, the first switch KD is disconnected, and the second power battery 4 enters the discharge state to provide driving power for the drive motor 1 and power the load 5. The above process is a fault response process. Even if the first power battery 3 that fails is removed first, the vehicle can still rely on the normal second power battery 4 to continue to run without power reduction, thereby improving the safety and reliability of the system. Of course, the system needs to issue a fault warning to indicate that the first power battery 3 has failed and recommends repair or replacement as soon as possible.

[0052] When the control unit detects that the first power battery 3 fails and the power of the second power battery 4 is lower than the second preset value, the third switch KC is disconnected, the first switch KD is closed, the range extender component 2 starts to provide driving power for the drive motor 1 and power the load 5, the fourth switch KC1 and the sixth switch KF1 are both disconnected, the first power battery 3 exits operation, and the dual power battery switching is locked until the first power battery 3 returns to normal; the second switch KF and the seventh switch KF2 are both disconnected, the third switch KC and the fifth switch KC2 are both closed, and the range extender component 2 provides driving power for the drive motor 1 and charges the second power battery 4. The above process is a fault response process. When one group of power batteries fails and the power of another group is low, measures are taken to remove the faulty battery, and the range extender component 2 is used in time to maintain driving power, system power supply, and charge the normal second power battery 4. Of course, the system needs to issue a fault warning to prompt that the first power battery 3 has failed and repair or replace it as soon as possible.

[0053] When the control unit detects that the second power battery 4 fails and the power of the first power battery 3 is lower than the second preset value, the third switch KC is disconnected, the first switch KD is closed, the range extender component 2 starts to provide driving power for the drive motor 1 and power the load 5, the fifth switch KC2 and the seventh switch KF2 are both disconnected, the second power battery 4 exits operation, and the dual power battery switching is locked until the second power battery 4 returns to normal; the second switch KF and the sixth switch KF1 are both disconnected, the third switch KC and the fourth switch KC1 are both closed, and the range extender component 2 provides driving power for the drive motor 1 and charges the first power battery 3. The above process is a fault response process. When one group of power batteries fails and the power of another group is low, measures are taken to remove the faulty battery, and the range extender component 2 is used in time to maintain driving power, system power supply, and charge the normal first power battery 3. Of course, the system needs to issue a fault warning to prompt that the second power battery 4 has failed and repair or replace it as soon as possible.

[0054] When the control unit detects that both the first power battery 3 and the second power battery 4 have failed, the third switch KC is disconnected, the first switch KD is closed, the range extender 2 is started to provide driving power for the drive motor 1 and power the load 5, the second switch KF, the fourth switch KC1, the sixth switch KF1, the fifth switch KC2, and the seventh switch KF2 are all disconnected, and the first power battery 3 and the second power battery 4 are both out of operation. The above process is a response process for a serious fault. When both groups of power batteries fail, measures are taken immediately to remove all failed power batteries, and the vehicle can continue to operate safely. Of course, the system needs to issue a fault warning, indicating that both the first power battery 3 and the second power battery 4 are faulty, and requires repair or replacement as soon as possible.

[0055] When the control unit detects that the range extender component 2 fails or the fuel is exhausted and cannot be replenished, and the power of the first power battery 3 is higher than the first preset value, the dual power battery switching function is disabled, the first switch KD, the third switch KC, and the seventh switch KF2 are all disconnected, the second switch KF and the sixth switch KF1 are all closed, the first power battery 3 operates independently to provide driving power for the drive motor 1 and power the load 5, and the dual power battery switching function is disabled. This process is a serious fault response process, and the system alarm requires timely maintenance of the range extender component 2.

[0056] The utility model optimizes and improves on the basis of the conventional extended-range automobile power system structure, and is based on the intelligent automatic switching of two groups of power batteries and their charging and discharging states during vehicle driving, so that one group of power batteries can be discharged while the other group of power batteries can be charged, solving the problem that a single power battery cannot be charged and discharged at the same time; when the power battery used for driving is low on power and needs to be charged, the other group of power batteries with sufficient power will be automatically switched to a discharged state to provide driving power, and the two groups of power batteries will be fully utilized to switch alternately in time to provide reliable and stable full-effect driving power; when the power battery is low on power, the range extender will no longer provide driving power, solving the problem that the vehicle power is significantly reduced when the power is low on power; after the improvement, the charging process of the power battery is evenly distributed to the driving process, ensuring that the range extender continuously charges the power battery with a suitable and balanced output power, preventing jitter and noise caused by frequent starting and stopping and overload operation of the range extender, and significantly improving the overall performance and user experience. In addition, when a group of power batteries or their main circuits fail, it can also automatically switch to another group of normal power batteries for operation, avoiding the problem of vehicle stalling and power loss or sharp power drop when the power battery or its main circuit fails in the single power battery system, significantly improving the system's risk resistance and emergency response capabilities, and more comprehensively ensuring the safety and reliability of the vehicle. After the improvement, the original design of the extended-range system, which uses power batteries to provide power and the range extender only assists in energy storage, has been returned to the original design of the extended-range system, which retains the original advantages of basic reliability and no anxiety about endurance, and also has the complete power performance of pure electric vehicles and the same driving experience as pure electric vehicles, giving full play to the capabilities and effects of the extended-range system, and its advantages are more prominent than those of pure electric vehicles. In order to solve the problem of short-term stalling and power loss at the moment of switching between the two groups of power batteries during driving, the system takes measures to ensure seamless switching by having the range extender take over to maintain driving power and system power supply before the power battery is switched, so as to ensure power failure at the moment of switching and during the whole process, and improve the reliability and stability of switching. In addition, the two groups of power batteries are strictly prohibited from being parallel during the switching process to avoid the instability factors that may be caused by the parallel power batteries. The utility model adopts a dual power battery intelligent switching structure to replace the original complex low-power strategy, so that the two groups of power batteries are fully charged and discharged in turn during normal driving, and provide driving power alternately. The low-power strategy is only needed under special abnormal circumstances such as one group of power batteries fails or two groups of power batteries are simultaneously low-powered. The power distribution disorder caused by frequent adjustments triggered by the complex low-power strategy is avoided as much as possible, and power collapse and failure caused by accelerated attenuation and aging due to frequent local charging and discharging of the power battery is prevented.

[0057] The utility model is improved on the basis of retaining the original extended-range system structure as much as possible. The power battery involved is kept consistent with the original single power battery in terms of appearance, size and structure as much as possible, and is only divided into two independent groups in the internal structure to improve the operability of the improvement and reduce the cost of transformation and transplantation.

[0058] The specific embodiments described above further describe the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the utility model is not inherently related to any specific computer, virtual device or electronic device, and various general devices can also implement the utility model. The above description is only a specific embodiment of the utility model and is not intended to limit the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model shall be included in the protection scope of the utility model.

[0059] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0060] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A dual power battery system based on range extender with non-stop power switching, characterized in that: include: A drive motor (1), a range extender component (2), a first power battery (3), a second power battery (4), a load (5), a first switch KD, a second switch KF, a third switch KC, a fourth switch KC1, a fifth switch KC2, a sixth switch KF1, and a seventh switch KF2; The drive motor (1) is connected to the load (5), the load (5) is respectively connected to the first switch KD and the second switch KF, the first switch KD is respectively connected to the range extender component (2) and the third switch KC, the third switch KC is respectively connected to the fourth switch KC1 and the fifth switch KC2, the fourth switch KC1 is connected to the first power battery (3), the fifth switch KC2 is connected to the second power battery (4), the second switch KF is respectively connected to the sixth switch KF1 and the seventh switch KF2, the sixth switch KF1 is connected to the first power battery (3), and the seventh switch KF2 is connected to the second power battery (4).

2. The dual power battery system based on the range extender without power switching as claimed in claim 1, characterized in that: The range extender component (2) comprises a generator (21) connected between the first switch KD and the third switch KC, and an engine (22) connected to the generator (21).

3. The dual power battery system based on the range extender without power switching as claimed in claim 2, characterized in that: include: When the power level of the first power battery (3) is higher than a first preset value and the power level of the second power battery (4) is lower than a second preset value, the fourth switch KC1 is disconnected, the first power battery (3) exits the charging state, the first switch KD is closed, the range extender component (2) is continuously started to replace the second power battery (4) to provide driving power for the drive motor (1) and power the load (5), the seventh switch KF2 is disconnected, the second power battery (4) exits the discharging state, the second switch KF is closed, the sixth switch KF1 is closed, the first power battery (3) enters the discharging state to provide driving power for the drive motor (1) and power the load (5), the first switch KD is disconnected, the third switch KC is closed, the fifth switch KC2 is closed, and the second power battery (4) enters the charging state.

4. The dual power battery system based on the range extender without power switching as claimed in claim 2, characterized in that: include: When the power level of the first power battery (3) is lower than a second preset value and the power level of the second power battery (4) is higher than the first preset value, the fifth switch KC2 is disconnected, the second power battery (4) exits the charging state, the first switch KD is closed, the range extender component (2) is continuously started to replace the first power battery (3) to provide driving power for the drive motor (1) and power the load (5), the sixth switch KF1 is disconnected, the first power battery (3) exits the discharging state, the second switch KF is closed, the seventh switch KF2 is closed, the second power battery (4) enters the discharging state to provide driving power for the drive motor (1) and power the load (5), the first switch KD is disconnected, the third switch KC is closed, the fourth switch KC1 is closed, and the first power battery (3) enters the charging state.

5. The dual power battery system based on the range extender without power switching as claimed in claim 3, characterized in that: include: When the first power battery (3) and the second power battery (4) are both lower than the second preset value, the first switch KD is closed, the range extender component (2) is started to provide driving power for the drive motor (1) and to supply power to the load (5), the second switch KF, the sixth switch KF1, the seventh switch KF2, and the fifth switch KC2 are all disconnected, the third switch KC is closed, and the fourth switch KC1 is closed, the range extender component (2) charges the first power battery (3), and the second power battery (4) is on standby.

6. The dual power battery system based on the range extender without power switching as claimed in claim 4, characterized in that: include: When the first power battery (3) and the second power battery (4) are both higher than the first preset value, the third switch KC, the fourth switch KC1, the fifth switch KC2, and the seventh switch KF2 are all disconnected, the second switch KF and the sixth switch KF1 are both closed, the first power battery (3) enters a discharge state to provide driving power for the drive motor (1) and power the load (5), and the second power battery (4) is in standby mode.

7. The dual power battery system based on the range extender without power switching as claimed in claim 5, characterized in that: include: When the second power battery (4) fails and the power level of the first power battery (3) is higher than the first preset value, the third switch KC is disconnected, the first switch KD is closed, the range extender component (2) is started, the fifth switch KC2 and the seventh switch KF2 are both disconnected, the second power battery (4) exits operation, and the dual power battery switching is locked until the second power battery (4) returns to normal; the fourth switch KC1 is disconnected, the second switch KF and the sixth switch KF1 are both closed, the range extender component (2) is turned off, the first switch KD is disconnected, and the first power battery (3) enters a discharge state to provide driving power for the drive motor (1) and power the load (5); or, When the first power battery (3) fails and the power level of the second power battery (4) is higher than the first preset value, the third switch KC is disconnected, the first switch KD is closed, the range extender component (2) is started, the fourth switch KC1 and the sixth switch KF1 are both disconnected, the first power battery (3) exits operation, and the dual power battery switching is locked until the first power battery (3) returns to normal; the fifth switch KC2 is disconnected, the second switch KF and the seventh switch KF2 are both closed, the range extender component (2) is turned off, the first switch KD is disconnected, and the second power battery (4) enters a discharge state to provide driving power for the drive motor (1) and power the load (5).

8. The dual power battery system based on the range extender without power switching as claimed in claim 6, characterized in that: include: When the first power battery (3) fails and the power level of the second power battery (4) is lower than the second preset value, the third switch KC is disconnected, the first switch KD is closed, the range extender component (2) starts to provide driving power for the drive motor (1) and to supply power to the load (5), the fourth switch KC1 and the sixth switch KF1 are both disconnected, the first power battery (3) exits operation, and the dual power battery switching is locked until the first power battery (3) returns to normal; the second switch KF and the seventh switch KF2 are both disconnected, the third switch KC and the fifth switch KC2 are both closed, the range extender component (2) provides driving power for the drive motor (1) and charges the second power battery (4); or, When the second power battery (4) fails and the power level of the first power battery (3) is lower than the second preset value, the third switch KC is disconnected, the first switch KD is closed, the range extender component (2) starts to provide driving power for the drive motor (1) and to supply power to the load (5), the fifth switch KC2 and the seventh switch KF2 are both disconnected, the second power battery (4) exits operation, and the dual power battery switching is locked until the second power battery (4) returns to normal; the second switch KF and the sixth switch KF1 are both disconnected, the third switch KC and the fourth switch KC1 are both closed, the range extender component (2) provides driving power for the drive motor (1) and charges the first power battery (3).

9. The dual power battery system based on the range extender without power switching as claimed in claim 7, characterized in that: include: When both the first power battery (3) and the second power battery (4) fail, the third switch KC is disconnected, the first switch KD is closed, the range extender component (2) is started to provide driving power for the drive motor (1) and to supply power to the load (5), the second switch KF, the fourth switch KC1, the sixth switch KF1, the fifth switch KC2, and the seventh switch KF2 are all disconnected, and the first power battery (3) and the second power battery (4) are both out of operation.

10. The dual power battery system based on the range extender without power switching as claimed in claim 8, characterized in that: include: When the range extender component (2) fails or the fuel is exhausted and cannot be replenished, and the power level of the first power battery (3) is higher than the first preset value, the dual power battery switching function is disabled, the first switch KD, the third switch KC, and the seventh switch KF2 are all disconnected, and the second switch KF and the sixth switch KF1 are all closed, and the first power battery (3) operates independently to provide driving power for the drive motor (1) and power the load (5).

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