Battery protection method, device and equipment for extended-range vehicle, medium and product

Abstract

The invention provides a battery protection method, device and equipment for an extended-range vehicle, a medium and a product. According to the method, after the current temperature, the current charge state of a battery and the initial charge state of the battery when a vehicle is powered on are obtained, if it is determined that the current temperature is smaller than a preset charging temperature threshold value, the battery is charged according to whether the current temperature is smaller than a preset discharging temperature threshold value or not and the current charge state and the initial charge state; and determining a driving motor power upper limit value and a range extender generation power upper limit value, controlling the driving motor according to the driving motor power upper limit value, and controlling the range extender according to the range extender generation power upper limit value. According to the scheme, the driving motor and the range extender are controlled through the determined upper limit value of the power of the driving motor and the determined upper limit value of the generated power of the range extender, the generated power and the charging power of the battery can be controlled, the conditions of over-charging and over-discharging are reduced, and the safety of the battery is improved.

Description

Technical Field

[0001] This application relates to the technical field of vehicles, and particularly to a battery protection method, device, equipment, medium and product for a range-extended vehicle. Background Art

[0002] With the continuous development of technology, range-extended vehicles have emerged. A range-extended vehicle is a vehicle that adds a range extender on the basis of a pure electric vehicle, and the range extender can supplement power to the battery.

[0003] In the prior art, the driving environment of vehicles is complex and diverse. When a range-extended vehicle is driving in a low-temperature environment, since low temperature will affect the battery, resulting in a weakened charge and discharge capacity of the battery. If the battery is still charged and discharged according to the charge and discharge strategy at normal temperature, it will damage the battery structure and shorten the battery life.

[0004] Therefore, there is an urgent need for a battery protection method that can protect the battery of a range-extended vehicle at low temperature. Summary of the Invention

[0005] The battery protection method, device, equipment, medium and product for a range-extended vehicle provided by the embodiments of this application are used to protect the battery of a range-extended vehicle at low temperature.

[0006] In a first aspect, the embodiments of this application provide a battery protection method for a range-extended vehicle, including:

[0007] Obtain the current temperature of the battery, the current state of charge of the battery, and the initial state of charge of the battery when the vehicle is powered on;

[0008] If the current temperature is less than a preset charging temperature threshold, then determine the upper limit value of the driving motor power and the upper limit value of the range extender power generation according to whether the current temperature is less than a preset discharging temperature threshold, and the current state of charge and the initial state of charge, where the preset discharging temperature threshold is less than the preset charging temperature threshold;

[0009] Control the driving motor according to the upper limit value of the driving motor power, and control the range extender according to the upper limit value of the range extender power generation.

[0010] In a possible implementation manner, the determining the upper limit value of the driving motor power and the upper limit value of the range extender power generation according to whether the current temperature is less than a preset discharging temperature threshold, and the current state of charge and the initial state of charge includes:

[0011] If the current temperature is less than the preset discharging temperature threshold, then determine the upper limit value of the driving motor power and the upper limit value of the range extender power generation according to the current state of charge and the initial state of charge;

[0012] If the current temperature is greater than or equal to the preset discharge temperature threshold, determine that the upper limit value of the driving motor power is positive infinity, and determine the upper limit value of the range extender power generation according to whether the current temperature is less than the preset hierarchical temperature threshold. The preset hierarchical temperature threshold is greater than the preset discharge temperature threshold, and the preset hierarchical temperature threshold is less than the preset charging temperature threshold.

[0013] In a possible implementation manner, the determining the upper limit value of the driving motor power and the upper limit value of the range extender power generation according to the current state of charge and the initial state of charge includes:

[0014] If the initial state of charge is greater than the preset first-level power threshold, determine whether the current state of charge is greater than the preset second-level power threshold;

[0015] If the current state of charge is greater than the preset second-level power threshold, determine that the upper limit value of the range extender power generation is the preset first power generation power, and determine that the upper limit value of the driving motor power is positive infinity;

[0016] If the current state of charge is less than or equal to the preset second-level power threshold, determine whether the current state of charge is greater than the preset third-level power threshold;

[0017] If the current state of charge is greater than the preset third-level power threshold, determine that the upper limit value of the range extender power generation is the preset first power generation power, and determine that the upper limit value of the driving motor power is the preset first operating power;

[0018] If the current state of charge is less than or equal to the preset third-level power threshold, determine that the upper limit value of the range extender power generation is the preset second power generation power, and determine that the upper limit value of the driving motor power is 0;

[0019] Wherein, the preset first-level power threshold, the preset second-level power threshold and the preset third-level power threshold decrease in sequence, and the preset first power generation power is greater than the preset second power generation power.

[0020] In a possible implementation manner, the method further includes:

[0021] If the initial state of charge is greater than the preset fourth-level power threshold and less than or equal to the first-level power threshold, determine whether the current state of charge is greater than the preset second-level power threshold;

[0022] If the current state of charge is greater than the preset second-level power threshold, determine that the upper limit value of the range extender power generation is the preset first power generation power, and determine that the upper limit value of the driving motor power is the preset second operating power;

[0023] If the current state of charge is less than or equal to the preset second-level power threshold, determine whether the current state of charge is greater than the preset third-level power threshold;

[0024] If the current state of charge is greater than the preset third-level power threshold, determine that the upper limit value of the power generation of the range extender is the preset first power generation power, and determine that the upper limit value of the power of the drive motor is the preset third operating power;

[0025] If the current state of charge is less than or equal to the preset third-level power threshold, determine that the upper limit value of the power generation of the range extender is the preset second power generation power, and determine that the upper limit value of the power of the drive motor is 0;

[0026] Wherein, the preset first-level power threshold is less than the preset first-level power threshold, the preset first-level power threshold is greater than the preset second-level power threshold, and the preset third operating power is less than the preset second operating power and the preset first operating power.

[0027] In a possible implementation manner, the method further includes:

[0028] If the starting state of charge is less than or equal to the preset fourth-level power threshold, determine whether the current state of charge is greater than the preset third-level power threshold;

[0029] If the current state of charge is greater than the preset third-level power threshold, determine that the upper limit value of the power generation of the range extender is the preset first power generation power, and determine that the upper limit value of the power of the drive motor is the preset third operating power;

[0030] If the current state of charge is less than or equal to the preset third-level power threshold, determine that the upper limit value of the power generation of the range extender is the preset second power generation power, and determine that the upper limit value of the power of the drive motor is 0.

[0031] In a possible implementation manner, the determining the upper limit value of the power generation of the range extender according to whether the current temperature is less than the preset grading temperature threshold includes:

[0032] If the current temperature is less than the preset grading temperature threshold, determine that the upper limit value of the power generation of the range extender is the preset third power generation power;

[0033] If the current temperature is greater than or equal to the preset grading temperature threshold, determine that the upper limit value of the power generation of the range extender is the preset fourth power generation power, and the preset fourth power generation power is greater than the preset third power generation power.

[0034] Second aspect, an embodiment of the present application provides a battery protection device for a range-extended vehicle, including:

[0035] An acquisition module, configured to acquire the current temperature of the battery, the current state of charge of the battery, and the starting state of charge of the battery when the vehicle is powered on;

[0036] A processing module, configured to, if the current temperature is less than a preset charging temperature threshold, determine an upper limit value of the driving motor power and an upper limit value of the range extender power generation according to whether the current temperature is less than a preset discharging temperature threshold, and the current state of charge and the starting state of charge, where the preset discharging temperature threshold is less than the preset charging temperature threshold;

[0037] A protection module, configured to control the driving motor according to the upper limit value of the driving motor power, and control the range extender according to the upper limit value of the range extender power generation.

[0038] Third aspect, an embodiment of the present application provides an electronic device, including:

[0039] A processor, a memory, and a communication interface;

[0040] The memory is configured to store executable instructions of the processor;

[0041] Wherein, the processor is configured to execute the battery protection method for the range-extended vehicle according to any one of the first aspect by executing the executable instructions.

[0042] Fourth aspect, an embodiment of the present application provides a readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the battery protection method for the range-extended vehicle according to any one of the first aspect is implemented.

[0043] Fifth aspect, an embodiment of the present application provides a computer program product, including a computer program, and when the computer program is executed by a processor, it is used to implement the battery protection method for the range-extended vehicle according to any one of the first aspect.

[0044] The battery protection method, device, equipment, medium and product for a range-extended vehicle provided by an embodiment of the present application, after obtaining the current temperature, the current state of charge of the battery, and the initial state of charge of the battery when the vehicle is powered on, if it is determined that the current temperature is less than the preset charging temperature threshold, then according to whether the current temperature is less than the preset discharging temperature threshold, as well as the current state of charge and the initial state of charge, the upper limit value of the driving motor power and the upper limit value of the range extender power generation are determined. Furthermore, the driving motor is controlled according to the upper limit value of the driving motor power, and the range extender is controlled according to the upper limit value of the range extender power generation. By using the determined upper limit values of the driving motor power and the range extender power generation to control the driving motor and the range extender, the power generation power and charging power of the battery can be controlled, the situations of overcharging and over-discharging are reduced, and the battery safety is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The accompanying drawings herein are incorporated into the specification and form a part of the specification, showing embodiments consistent with the present application and, together with the specification, are used to explain the principles of the present application.

[0046] Figure 1 It is a schematic flowchart of Embodiment 1 of the battery protection method for a range-extended vehicle provided by the present application;

[0047] Figure 2 It is a schematic flowchart of Embodiment 2 of the battery protection method for a range-extended vehicle provided by the present application;

[0048] Figure 3 It is a schematic flowchart of Embodiment 3 of the battery protection method for a range-extended vehicle provided by the present application;

[0049] Figure 4 It is a schematic flowchart of Embodiment 4 of the battery protection method for a range-extended vehicle provided by the present application;

[0050] Figure 5 It is a schematic structural diagram of the embodiment of the battery protection device for a range-extended vehicle provided by the present application;

[0051] Figure 6 It is a schematic structural diagram of an electronic device provided by the present application.

[0052] Through the above accompanying drawings, the clear embodiments of the present application have been shown, and there will be more detailed descriptions hereinafter. These accompanying drawings and the written description are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0053] Exemplary embodiments will be described in detail herein, and examples thereof are shown in the accompanying drawings. When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0054] The terms "first", "second", "third", "fourth", etc. (if any) in the specification, claims and above-mentioned drawings of the present application are used to distinguish similar objects and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so that the embodiments of the present application described here can be implemented in an order other than those illustrated or described here. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0055] With the continuous development of technology, range-extended vehicles have emerged. A range-extended vehicle is a vehicle that adds a range extender on the basis of a pure electric vehicle. The range extender can supplement power to the battery when the battery power is insufficient, improving the vehicle's endurance.

[0056] In the prior art, the vehicle driving environment is complex and diverse. When a range-extended vehicle is driving in a low-temperature environment, since low temperature will affect the battery, resulting in a weakened charge and discharge capacity of the battery. If the battery is still charged and discharged according to the charge and discharge strategy at normal temperature, it will damage the battery structure and shorten the battery life. Therefore, there is an urgent need for a battery protection method that can protect the battery of a range-extended vehicle at low temperature.

[0057] In view of the problems existing in the prior art, the inventors found in the process of researching the battery protection method for range-extended vehicles that when the battery is charged and discharged according to the charge and discharge strategy at normal temperature at low temperature, it will cause damage to the battery due to overcharging and over-discharging problems. Therefore, the power of the drive motor can be limited at low temperature to prevent the battery from over-discharging; the power generation power of the range extender can be limited to prevent the battery from overcharging. Furthermore, since the charging performance of the battery will be affected first and then the discharging performance of the battery will be affected as the temperature gradually decreases, when it is determined that the current is in a low-temperature situation, the upper limit values of the drive motor power and the range extender power generation power can be determined according to whether the current temperature affects the discharging performance of the battery. Based on the above inventive concept, the battery protection scheme for range-extended vehicles in the present application is designed.

[0058] In this application, the execution subject of the battery protection method for a range-extended vehicle can be the vehicle control unit (VCU) in the range-extended vehicle, or it can also be a server, an in-vehicle terminal, etc. This application does not limit it. Hereinafter, an example will be given with the VCU as an example.

[0059] Hereinafter, an example will be given to illustrate the application scenario of the battery protection method for a range-extended vehicle provided in this application.

[0060] Exemplarily, in this application scenario, the range-extended vehicle is driving in a low-temperature environment. The VCU in the vehicle obtains the initial state of charge of the battery when the vehicle is powered on, and obtains the current temperature and the current state of charge of the battery in real time during the vehicle driving process.

[0061] If the VCU determines that the current temperature is lower than the preset charging temperature threshold, it indicates that the temperature has affected the charging performance of the battery, and the current environment is already a low-temperature environment. It is necessary to determine the upper limit value of the driving motor power and the upper limit value of the range extender power generation according to whether the current temperature is lower than the preset discharging temperature threshold, and the current state of charge and the initial state of charge.

[0062] It should be noted that the preset charging temperature threshold can be 5 degrees Celsius, 6 degrees Celsius, 8 degrees Celsius, etc., and the preset discharging temperature threshold can be -1 degree Celsius, 0 degree Celsius, 2 degrees Celsius, etc. The embodiments of this application do not limit the preset charging temperature threshold and the preset discharging temperature threshold, and can be determined according to the actual situation.

[0063] Furthermore, the VCU controls the driving motor according to the upper limit value of the driving motor power, so that the power of the driving motor does not exceed the upper limit value of the driving motor power. Therefore, the discharging power of the battery is limited, and the over-discharging of the battery is prevented.

[0064] The VCU controls the range extender according to the upper limit value of the range extender power generation, so that the power generation power of the range extender does not exceed the upper limit value of the range extender power generation. Therefore, the charging power of the battery is limited, and the overcharging of the battery is prevented.

[0065] It should be noted that the above scenario is only an example of an application scenario provided by the embodiments of this application. The embodiments of this application do not limit the actual forms of various devices included in this scenario, nor do they limit the interaction methods between devices. In the specific application of the solution, it can be set according to actual needs.

[0066] Hereinafter, the technical solution of this application will be described in detail through specific embodiments. It should be noted that the following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments.

[0067] Figure 1 Figure 1 is a schematic flowchart of the first embodiment of the battery protection method for a range-extended vehicle provided by the present application. In the embodiment of the present application, the VCU determines the upper limit value of the driving motor power and the upper limit value of the range extender power generation according to the current temperature, the current state of charge of the battery, and the initial state of charge of the battery when the vehicle is powered on, and then controls the driving motor and the range extender to achieve the case of battery low-temperature protection. The method in this embodiment can be implemented by software, hardware, or a combination of software and hardware. As Figure 1 shown, the battery protection method for the range-extended vehicle specifically includes the following steps:

[0068] S101: Obtain the current temperature of the battery, the current state of charge of the battery, and the initial state of charge of the battery when the vehicle is powered on.

[0069] In this step, in order to protect the battery at low temperatures, the VCU needs to obtain the current temperature of the battery, the current state of charge of the battery, and the initial state of charge of the battery when the vehicle is powered on in real time.

[0070] S102: If the current temperature is less than the preset charging temperature threshold, determine the upper limit value of the driving motor power and the upper limit value of the range extender power generation according to whether the current temperature is less than the preset discharging temperature threshold, and the current state of charge and the initial state of charge.

[0071] In this step, after the VCU obtains the current temperature, the current state of charge, and the initial state of charge, in order to determine whether the battery performance is affected by low temperature, it is necessary to determine whether the current temperature is less than the preset charging temperature threshold.

[0072] If the current temperature is less than the preset charging temperature threshold, it means that the charging performance of the battery is affected. Furthermore, in order to determine whether the discharging performance of the battery is affected, and how to protect the battery when the battery performance is affected, it is necessary to determine the upper limit value of the driving motor power and the upper limit value of the range extender power generation according to whether the current temperature is less than the preset discharging temperature threshold, and the current state of charge and the initial state of charge.

[0073] It should be noted that the preset discharging temperature threshold is less than the preset charging temperature threshold.

[0074] Specifically, if the current temperature is less than the preset discharging temperature threshold, it means that the discharging performance of the battery is also affected by low temperature. Since the initial state of charge and the current state of charge characterize the charging and discharging performance of the battery, the upper limit value of the driving motor power and the upper limit value of the range extender power generation are determined according to the current state of charge and the initial state of charge.

[0075] If the current temperature is greater than or equal to the preset discharge temperature threshold, it indicates that the discharge performance of the battery is not affected. Then, the upper limit value of the driving motor power is determined to be positive infinity, that is, the power of the driving motor is not restricted.

[0076] Since only the charging performance of the battery is affected at this time, the charging power of the battery needs to be restricted to prevent overcharging of the battery. This requires restricting the power generation power of the range extender. Since the lower the temperature, the greater the impact of the temperature on the charging performance of the battery, the upper limit value of the range extender power generation power can be determined according to whether the current temperature is less than the preset hierarchical temperature threshold.

[0077] It should be noted that the preset hierarchical temperature threshold is greater than the preset discharge temperature threshold and less than the preset charging temperature threshold. The preset hierarchical temperature threshold can be 3 degrees Celsius, 4 degrees Celsius, 5 degrees Celsius, etc. The embodiments of the present application do not limit the preset hierarchical temperature threshold and can be determined according to actual situations.

[0078] If the current temperature is less than the preset hierarchical temperature threshold, the upper limit value of the range extender power generation power is determined to be the preset third power generation power; if the current temperature is greater than or equal to the preset hierarchical temperature threshold, the upper limit value of the range extender power generation power is determined to be the preset fourth power generation power. Among them, the preset fourth power generation power is greater than the preset third power generation power.

[0079] For the case where the current temperature is less than the preset hierarchical temperature threshold and the case where the current temperature is greater than or equal to the preset hierarchical temperature threshold, when comparing the two cases, in the case where the current temperature is less than the preset hierarchical temperature threshold, the impact of the temperature on the charging performance of the battery is greater, and the charging performance of the battery is worse, so the upper limit value of the range extender power generation power is smaller. In the case where the current temperature is greater than or equal to the preset hierarchical temperature threshold, the impact of the temperature on the charging performance of the battery is smaller, and the charging performance of the battery is better, so the upper limit value of the range extender power generation power is larger.

[0080] It should be noted that the preset third power generation power can be 14kW, 15kW, 16kW, etc., and the preset fourth power generation power can be 28kW, 30kW, 35kW, etc. The embodiments of the present application do not limit the preset third power generation power and the preset fourth power generation power and can be determined according to actual situations.

[0081] In one implementation, when the current temperature is greater than or equal to the preset discharge temperature threshold, the temperature range to which the current temperature belongs can be determined according to the correspondence table between the temperature range and the upper limit value of the range extender power generation power, and then the upper limit value of the range extender power generation power corresponding to this temperature range is used as the upper limit value of the range extender power generation power determined when the current temperature is greater than or equal to the preset discharge temperature threshold and less than the preset charging temperature threshold.

[0082] Exemplarily, Table 1 shows the corresponding relationship table between the temperature range and the upper limit value of the power generation of the range extender provided by the present application.

[0083] Table 1

[0084]

[0085] Among them, 4°C is the preset grading temperature threshold, 6°C is the preset charging temperature threshold, 0°C is the preset discharging temperature threshold, 30kW is the preset fourth power generation power, and 15kW is the preset third power generation power. When the current temperature belongs to [0°C, 4°C), it is determined that the upper limit value of the power generation of the range extender is 15kW. When the current temperature belongs to [4°C, 6°C), it is determined that the upper limit value of the power generation of the range extender is 30kW.

[0086] It should be noted that Table 1 is only an example of the corresponding relationship between the temperature range and the upper limit value of the power generation of the range extender. The embodiments of the present application do not limit the temperature range, the upper limit value of the power generation of the range extender, nor the corresponding relationship between the two, and can be determined according to the actual situation.

[0087] It should be noted that when the current temperature is greater than or equal to the preset charging temperature threshold, it indicates that both the charging performance and the discharging performance of the battery are not affected by low temperature, so the power of the drive motor and the power generation of the range extender are not restricted.

[0088] S103: Control the drive motor according to the upper limit value of the drive motor power, and control the range extender according to the upper limit value of the range extender power generation.

[0089] In this step, after the VCU obtains the upper limit value of the drive motor power and the upper limit value of the range extender power generation, it controls the drive motor according to the upper limit value of the drive motor power, so that when the drive motor is working, the power of the drive motor will not exceed the upper limit value of the drive motor power, so the discharging power of the battery is restricted, preventing the battery from over-discharging.

[0090] Control the range extender according to the upper limit value of the range extender power generation, so that when the range extender is working, the power generation of the range extender will not exceed the upper limit value of the range extender power generation, so the charging power of the battery is restricted, preventing the battery from overcharging.

[0091] The battery protection method for a range - extender vehicle provided in this embodiment, after obtaining the current temperature, the current state of charge of the battery, and the initial state of charge of the battery when the vehicle is powered on, if it is determined that the current temperature is less than the preset charging temperature threshold, then according to whether the current temperature is less than the preset discharging temperature threshold, as well as the current state of charge and the initial state of charge, the upper limit value of the driving motor power and the upper limit value of the range - extender power generation are determined. Furthermore, the driving motor is controlled according to the upper limit value of the driving motor power, and the range - extender is controlled according to the upper limit value of the range - extender power generation. Through the determined upper limit values of the driving motor power and the range - extender power generation, this solution controls the driving motor and the range - extender, can control the power generation power and charging power of the battery, reduces the occurrence of over - charging and over - discharging, and improves battery safety.

[0092] Figure 2 FIG. 4 is a schematic flowchart of Embodiment 2 of the battery protection method for a range - extender vehicle provided in this application. On the basis of the above - mentioned embodiment, this application embodiment describes the situation of determining the upper limit value of the driving motor power and the upper limit value of the range - extender power generation when the initial state of charge is greater than the preset first - level power threshold. As Figure 2 shown, the battery protection method for this range - extender vehicle specifically includes the following steps:

[0093] S201: If the initial state of charge is greater than the preset first - level power threshold, determine whether the current state of charge is greater than the preset second - level power threshold; if the current state of charge is greater than the preset second - level power threshold, then execute step S202; if the current state of charge is less than or equal to the preset second - level power threshold, execute step S203.

[0094] Since the smaller the initial state of charge and the current state of charge, the greater the impact on the charge - discharge performance of the battery, the initial state of charge can be divided into three cases. The first case is that the initial state of charge is greater than the preset first - level power threshold; the second case is that the initial state of charge is greater than the preset fourth - level power threshold and less than or equal to the first - level power threshold; the third case is that the initial state of charge is less than or equal to the preset fourth - level power threshold.

[0095] It should be noted that the preset first - level power threshold is greater than the preset fourth - level power threshold. The preset first - level power threshold can be 60%, 65%, 70%, etc., and the preset fourth - level power threshold can be 40%, 45%, 50%, etc. This application embodiment does not limit the preset first - level power threshold and the preset fourth - level power threshold, and can be determined according to the actual situation.

[0096] In this step, if the initial state of charge is greater than the preset first - level power threshold, in order to determine the upper limit value of the driving motor power and the upper limit value of the range - extender power generation, the VCU also needs to determine whether the current state of charge is greater than the preset second - level power threshold.

[0097] It should be noted that the preset second-level power threshold is less than the preset fourth-level power threshold. The preset second-level power threshold can be 20%, 25%, 30%, etc. The embodiments of the present application do not limit the preset second-level power threshold, which can be determined according to the actual situation.

[0098] S202: Determine that the upper limit value of the power generation power of the range extender is the preset first power generation power, and determine that the upper limit value of the power of the drive motor is positive infinity.

[0099] In this step, if the VCU determines that the current state of charge is greater than the preset second-level power threshold, it means that the discharge performance of the battery is hardly affected, and the influence on the charging performance of the battery is relatively small. Therefore, it is determined that the upper limit value of the power generation power of the range extender is the preset first power generation power, and the upper limit value of the power of the drive motor is determined to be positive infinity.

[0100] It should be noted that the preset first power generation power can be 9kW, 10kW, 12kW, etc. The embodiments of the present application do not limit the preset first power generation power, which can be determined according to the actual situation.

[0101] It should be noted that the preset first power generation power is less than the preset third power generation power because the current temperature is less than the preset discharge temperature threshold at this time. Compared with the situation where the current temperature is greater than the preset discharge temperature threshold, the discharge performance of the battery is poor. Therefore, the preset first power generation power is less than the preset third power generation power.

[0102] S203: Determine whether the current state of charge is greater than the preset third-level power threshold; if the current state of charge is greater than the preset third-level power threshold, execute step S204; if the current state of charge is less than or equal to the preset third-level power threshold, execute step S205.

[0103] In this step, if the VCU determines that the current state of charge is less than or equal to the preset second-level power threshold, it is also necessary to determine whether the current state of charge is greater than the preset third-level power threshold.

[0104] It should be noted that the preset third-level power threshold is less than the preset second-level power threshold. The preset third-level power threshold can be 10%, 15%, 20%, etc. The embodiments of the present application do not limit the preset third-level power threshold, which can be determined according to the actual situation.

[0105] S204: Determine that the upper limit value of the power generation power of the range extender is the preset first power generation power, and determine that the upper limit value of the power of the drive motor is the preset first operating power.

[0106] In this step, if the VCU determines that the current state of charge is greater than the preset third-level power threshold, compared with the situation where the current state of charge is greater than the preset second-level power threshold, the charging performance of the battery is poor, and the discharge energy level is basically the same. Therefore, the upper limit value of the generator power of the range extender is determined as the preset first generator power, and the upper limit value of the drive motor power is determined as the preset first operating power.

[0107] It should be noted that the preset first operating power can be 12kW, 13kW, 15kW, etc. The embodiments of the present application do not limit the preset first operating power, and it can be determined according to the actual situation.

[0108] S205: Determine that the upper limit value of the generator power of the range extender is the preset second generator power, and determine that the upper limit value of the drive motor power is 0.

[0109] In this step, if the VCU determines that the current state of charge is less than or equal to the preset third-level power threshold, it is determined that the upper limit value of the drive motor power is 0, and the preset second generator power is less than the preset first generator power.

[0110] Compared with the situation where the current state of charge is greater than the preset third-level power threshold and less than or equal to the preset second-level power threshold, the charging performance and discharge performance of the battery are poor. Especially at this time, the battery can hardly discharge. Therefore, the determined preset second generator power is less than the preset first generator power, and the upper limit value of the drive motor power is determined to be 0.

[0111] It should be noted that the preset second generator power can be 5kW, 6kW, 8kW, etc. The embodiments of the present application do not limit the preset second generator power, and it can be determined according to the actual situation.

[0112] The battery protection method for a range-extended vehicle provided in this embodiment determines the upper limit value of the drive motor power and the upper limit value of the generator power of the range extender according to the current state of charge and the starting state of charge, ensuring that the battery will not be overcharged or over-discharged, and improving battery safety.

[0113] Figure 3 This is a schematic flowchart of the third embodiment of the battery protection method for a range-extended vehicle provided by the present application. On the basis of the above embodiments, the present application embodiment describes the situation of determining the upper limit value of the drive motor power and the upper limit value of the generator power of the range extender when the starting state of charge is greater than the preset fourth-level power threshold and less than or equal to the first-level power threshold. As Figure 3 shown, the battery protection method for this range-extended vehicle specifically includes the following steps:

[0114] S301: If the initial state of charge is greater than the preset fourth-level power threshold and less than or equal to the first-level power threshold, determine whether the current state of charge is greater than the preset second-level power threshold; if the current state of charge is greater than the preset second-level power threshold, then execute step S302; if the current state of charge is less than or equal to the preset second-level power threshold, execute step S303.

[0115] In this step, if the initial state of charge is greater than the preset fourth-level power threshold and less than or equal to the first-level power threshold, it indicates that the charge and discharge performance of the battery is affected. In order to determine the upper limit value of the driving motor power and the upper limit value of the range extender power generation, the VCU also needs to determine whether the current state of charge is greater than the preset second-level power threshold.

[0116] S302: Determine the upper limit value of the range extender power generation as the preset first power generation, and determine the upper limit value of the driving motor power as the preset second operating power.

[0117] In this step, if the VCU determines that the current state of charge is greater than the preset second-level power threshold, compared with the situation where the initial state of charge is greater than the preset first-level power threshold and the current state of charge is greater than the preset second-level power threshold, the discharge performance of the battery is poor and the charge performance is basically the same in the current situation. Therefore, determine the upper limit value of the range extender power generation as the preset first power generation, and determine the upper limit value of the driving motor power as the preset second operating power.

[0118] It should be noted that the preset second operating power can be 14kW, 15kW, 17kW, etc. The embodiments of the present application do not limit the preset second operating power, and it can be determined according to the actual situation.

[0119] S303: Determine whether the current state of charge is greater than the preset third-level power threshold; if the current state of charge is greater than the preset third-level power threshold, then execute step S304; if the current state of charge is less than or equal to the preset third-level power threshold, then execute step S305.

[0120] In this step, if the VCU determines that the current state of charge is less than or equal to the preset second-level power threshold, it still needs to determine whether the current state of charge is greater than the preset third-level power threshold.

[0121] S304: Determine the upper limit value of the range extender power generation as the preset first power generation, and determine the upper limit value of the driving motor power as the preset third operating power.

[0122] In this step, if the VCU determines that the current state of charge is greater than the preset third-level power threshold, it determines that the upper limit of the power generation power of the range extender is the preset first power generation power, and determines that the upper limit of the driving motor power is the preset third operating power, and the preset third operating power is less than the preset second operating power and the preset first operating power.

[0123] Compared with the situation where the starting state of charge is greater than the preset first-level power threshold, the current state of charge is greater than the preset third-level power threshold and less than or equal to the preset second-level power threshold, the discharge performance of the battery is poor in the current situation. Therefore, the determined preset third operating power is less than the preset first operating power.

[0124] Compared with the situation where the starting state of charge is less than or equal to the preset first-level power threshold and greater than the fourth-level power threshold, and the current state of charge is greater than the preset second-level power threshold, the discharge performance of the battery is poor in the current situation, and the charging performance is basically the same. Therefore, the determined preset third operating power is less than the preset second operating power, and the upper limit of the power generation power of the range extender is the preset first power generation power.

[0125] It should be noted that the preset third operating power can be 7kW, 8kW, 10kW, etc. The embodiments of the present application do not limit the preset third operating power, and it can be determined according to the actual situation.

[0126] S305: Determine that the upper limit of the power generation power of the range extender is the preset second power generation power, and determine that the upper limit of the driving motor power is 0.

[0127] In this step, if the VCU determines that the current state of charge is less than or equal to the preset third-level power threshold, it determines that the upper limit of the power generation power of the range extender is the preset second power generation power, and determines that the upper limit of the driving motor power is 0.

[0128] Compared with the situation where the starting state of charge is greater than the preset first-level power threshold and the current state of charge is less than or equal to the preset third-level power threshold, the charging performance and discharge performance of the battery are basically the same in the current situation. And compared with the situation where the starting state of charge is less than or equal to the preset first-level power threshold, the current state of charge is greater than the preset third-level power threshold and less than or equal to the preset second-level power threshold, the charging performance and discharge performance of the battery are poor. Especially at this time, the battery can hardly discharge. Therefore, the determined preset second power generation power is less than the preset first power generation power, and the upper limit of the driving motor power is determined to be 0.

[0129] The battery protection method for the range-extended vehicle provided by this embodiment determines the upper limit of the driving motor power and the upper limit of the power generation power of the range extender according to the current state of charge and the starting state of charge, which ensures that the battery will not be overcharged or over-discharged and improves the battery safety.

[0130] Figure 4 This is a schematic flowchart of the fourth embodiment of the battery protection method for a range-extended vehicle provided by this application. On the basis of the above embodiments, this application embodiment explains the situation of determining the upper limit value of the driving motor power and the upper limit value of the range extender power generation when the initial state of charge is less than or equal to the fourth-level power threshold. As Figure 4 shown, the battery protection method for this range-extended vehicle specifically includes the following steps:

[0131] S401: If the initial state of charge is less than or equal to the preset fourth-level power threshold, determine whether the current state of charge is greater than the preset third-level power threshold; if the current state of charge is greater than the preset third-level power threshold, then execute step S402; if the current state of charge is less than or equal to the preset third-level power threshold, then execute step S403.

[0132] In this step, if the initial state of charge is less than or equal to the preset fourth-level power threshold, it indicates that the charge and discharge performance of the battery is greatly affected. In order to determine the upper limit value of the driving motor power and the upper limit value of the range extender power generation, the VCU also needs to determine whether the current state of charge is greater than the preset third-level power threshold.

[0133] S402: Determine that the upper limit value of the range extender power generation is the preset first power generation power, and determine that the upper limit value of the driving motor power is the preset third operating power.

[0134] In this step, if the VCU determines that the current state of charge is greater than the preset third-level power threshold, compared with the situation where the initial state of charge is less than or equal to the preset first-level power threshold and greater than the fourth-level power threshold, and the current state of charge is greater than the preset third-level power threshold and less than or equal to the second-level power threshold, in this current situation, the charge performance and discharge performance of the battery are basically the same. Therefore, determine that the upper limit value of the range extender power generation is the preset first power generation power, and determine that the upper limit value of the driving motor power is the preset third operating power.

[0135] S403: Determine that the upper limit value of the range extender power generation is the preset second power generation power, and determine that the upper limit value of the driving motor power is 0.

[0136] In this step, if the VCU determines that the current state of charge is less than or equal to the preset third-level power threshold, compared with the case where the starting state of charge is less than or equal to the preset first-level power threshold and greater than the fourth-level power threshold, and the current state of charge is less than or equal to the third-level power threshold, the charging performance and discharging performance of the battery are basically the same in the current situation. And compared with the case where the starting state of charge is less than or equal to the preset fourth-level power threshold and the current state of charge is greater than the preset third-level power threshold, the charging and discharging performance of the battery is poor in the current situation. Especially at this time, the battery can hardly discharge. Therefore, the upper limit value of the generator power of the range extender is determined as the preset second generator power, and the upper limit value of the drive motor power is determined as 0.

[0137] The battery protection method for the range extender vehicle provided in this embodiment determines the upper limit value of the drive motor power and the upper limit value of the generator power of the range extender according to the current state of charge and the starting state of charge, which ensures that the battery will not be overcharged or over-discharged and improves the battery safety.

[0138] Next, through Embodiment 5 of the battery protection method for the range extender vehicle provided in this application, in the case where the current temperature is less than the preset discharge temperature threshold, the situation of determining the upper limit value of the drive motor power and the upper limit value of the generator power of the range extender according to the corresponding relationship table between the starting state of charge range, the current state of charge range and the upper limit value of the drive motor power and the upper limit value of the generator power of the range extender will be described.

[0139] It can be determined the starting state of charge range to which the starting state of charge belongs and the current state of charge range to which the current state of charge belongs. Then, according to the determined starting state of charge range and current state of charge range, the corresponding upper limit value of the drive motor power and the upper limit value of the generator power of the range extender are found from the corresponding relationship table between the starting state of charge range, the current state of charge range and the upper limit value of the drive motor power and the upper limit value of the generator power of the range extender, and used as the upper limit value of the drive motor power and the upper limit value of the generator power of the range extender in the case where the current temperature is less than the preset discharge temperature threshold.

[0140] Exemplarily, Table 2 is the corresponding relationship table between the starting state of charge range, the current state of charge range and the upper limit value of the drive motor power and the upper limit value of the generator power of the range extender provided in this application.

[0141] Table 2

[0142]

[0143] Among them, 65% is the preset first-level power threshold, 45% is the preset fourth-level power threshold, 25% is the preset second-level power threshold, 15% is the preset third-level power threshold, 13 kW is the preset first operating power, 15 kW is the preset second operating power, 8 kW is the preset third operating power, and 10 kW is the preset first power generation power, and 6 kW is the preset second power generation power.

[0144] It should be noted that Table 1 only exemplifies the correspondence between the starting state of charge range, the current state of charge range, the upper limit value of the drive motor power, and the upper limit value of the range extender power generation power. The embodiments of the present application do not limit the starting state of charge range, the current state of charge range, the upper limit value of the drive motor power, the upper limit value of the range extender power generation power, and the correspondence between the four, and can be determined according to the actual situation.

[0145] The battery protection method for the range-extended vehicle provided in this embodiment determines the upper limit value of the drive motor power and the upper limit value of the range extender power generation power according to the current state of charge and the starting state of charge, ensuring that the battery will not be overcharged or over-discharged, and improving battery safety.

[0146] The following is an embodiment of the device of the present application, which can be used to execute the method embodiment of the present application. For the details not disclosed in the device embodiment of the present application, please refer to the method embodiment of the present application.

[0147] Figure 5 It is a schematic structural diagram of an embodiment of the battery protection device for a range-extended vehicle provided by the present application. As Figure 5 shown, the battery protection device 50 of the range-extended vehicle includes:

[0148] An acquisition module 51, configured to acquire the current temperature of the battery, the current state of charge of the battery, and the starting state of charge of the battery when the vehicle is powered on;

[0149] A processing module 52, configured to determine the upper limit value of the drive motor power and the upper limit value of the range extender power generation power according to whether the current temperature is less than the preset discharge temperature threshold, and the current state of charge and the starting state of charge if the current temperature is less than the preset charging temperature threshold, and the preset discharge temperature threshold is less than the preset charging temperature threshold;

[0150] A protection module 53, configured to control the drive motor according to the upper limit value of the drive motor power and control the range extender according to the upper limit value of the range extender power generation power.

[0151] Further, the processing module 52 is specifically configured to:

[0152] If the current temperature is less than the preset discharge temperature threshold, determine the upper limit value of the driving motor power and the upper limit value of the range extender power generation according to the current state of charge and the initial state of charge;

[0153] If the current temperature is greater than or equal to the preset discharge temperature threshold, determine that the upper limit value of the driving motor power is positive infinity, and determine the upper limit value of the range extender power generation according to whether the current temperature is less than the preset grading temperature threshold. The preset grading temperature threshold is greater than the preset discharge temperature threshold and less than the preset charging temperature threshold.

[0154] Further, the processing module 52 is specifically further configured to:

[0155] If the initial state of charge is greater than the preset first-level power threshold, determine whether the current state of charge is greater than the preset second-level power threshold;

[0156] If the current state of charge is greater than the preset second-level power threshold, determine that the upper limit value of the range extender power generation is the preset first power generation power, and determine that the upper limit value of the driving motor power is positive infinity;

[0157] If the current state of charge is less than or equal to the preset second-level power threshold, determine whether the current state of charge is greater than the preset third-level power threshold;

[0158] If the current state of charge is greater than the preset third-level power threshold, determine that the upper limit value of the range extender power generation is the preset first power generation power, and determine that the upper limit value of the driving motor power is the preset first operating power;

[0159] If the current state of charge is less than or equal to the preset third-level power threshold, determine that the upper limit value of the range extender power generation is the preset second power generation power, and determine that the upper limit value of the driving motor power is 0;

[0160] Wherein, the preset first-level power threshold, the preset second-level power threshold and the preset third-level power threshold decrease in sequence, and the preset first power generation power is greater than the preset second power generation power.

[0161] Further, the processing module 52 is specifically further configured to:

[0162] If the initial state of charge is greater than the preset fourth-level power threshold and less than or equal to the first-level power threshold, determine whether the current state of charge is greater than the preset second-level power threshold;

[0163] If the current state of charge is greater than the preset second-level power threshold, determine that the upper limit of the power generation of the range extender is the preset first power generation power, and determine that the upper limit of the power of the drive motor is the preset second operating power;

[0164] If the current state of charge is less than or equal to the preset second-level power threshold, determine whether the current state of charge is greater than the preset third-level power threshold;

[0165] If the current state of charge is greater than the preset third-level power threshold, determine that the upper limit of the power generation of the range extender is the preset first power generation power, and determine that the upper limit of the power of the drive motor is the preset third operating power;

[0166] If the current state of charge is less than or equal to the preset third-level power threshold, determine that the upper limit of the power generation of the range extender is the preset second power generation power, and determine that the upper limit of the power of the drive motor is 0;

[0167] Among them, the preset first-level power threshold is less than the preset first-level power threshold, the preset first-level power threshold is greater than the preset second-level power threshold, and the preset third operating power is less than the preset second operating power and the preset first operating power.

[0168] Further, the processing module 52 is specifically further configured to:

[0169] If the starting state of charge is less than or equal to the preset fourth-level power threshold, determine whether the current state of charge is greater than the preset third-level power threshold;

[0170] If the current state of charge is greater than the preset third-level power threshold, determine that the upper limit of the power generation of the range extender is the preset first power generation power, and determine that the upper limit of the power of the drive motor is the preset third operating power;

[0171] If the current state of charge is less than or equal to the preset third-level power threshold, determine that the upper limit of the power generation of the range extender is the preset second power generation power, and determine that the upper limit of the power of the drive motor is 0.

[0172] Further, the processing module 52 is specifically further configured to:

[0173] If the current temperature is less than the preset grading temperature threshold, determine that the upper limit of the power generation of the range extender is the preset third power generation power;

[0174] If the current temperature is greater than or equal to the preset grading temperature threshold, determine that the upper limit of the power generation of the range extender is the preset fourth power generation power, and the preset fourth power generation power is greater than the preset third power generation power.

[0175] The battery protection device of the range - extender vehicle provided in this embodiment is used to implement the technical solutions in any of the foregoing method embodiments, and its implementation principle and technical effects are similar, which will not be elaborated here.

[0176] Figure 6 It is a schematic structural diagram of an electronic device provided by this application. As Figure 6 shown, the electronic device 60 includes:

[0177] a processor 61, a memory 62, and a communication interface 63;

[0178] The memory 62 is used to store the executable instructions of the processor 61;

[0179] Among them, the processor 61 is configured to execute the technical solutions in any of the foregoing method embodiments by executing the executable instructions.

[0180] Optionally, the memory 62 can be either independent or integrated with the processor 61.

[0181] Optionally, when the memory 62 is a device independent of the processor 61, the electronic device 60 may further include:

[0182] a bus 64. The memory 62 and the communication interface 63 are connected to the processor 61 through the bus 64 to complete mutual communication, and the communication interface 63 is used to communicate with other devices.

[0183] Optionally, the communication interface 63 can be specifically implemented by a transceiver. The communication interface is used to implement communication between the database access device and other devices (such as clients, read - write libraries, and read - only libraries). The memory may include a random access memory (RAM), and may also include a non - volatile memory, such as at least one disk memory.

[0184] The bus 64 can be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For the sake of representation, only a thick line is used in the figure, but it does not mean that there is only one bus or one type of bus.

[0185] The above-mentioned processor may be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it may also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components.

[0186] This electronic device is used to execute the technical solutions in any of the foregoing method embodiments. The implementation principles and technical effects are similar and will not be elaborated here.

[0187] The embodiment of the present application further provides a readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, it implements the technical solutions provided in any of the foregoing method embodiments.

[0188] The embodiment of the present application further provides a computer program product, including a computer program. When the computer program is executed by a processor, it is used to implement the technical solutions provided in any of the foregoing method embodiments.

[0189] Those of ordinary skill in the art can understand that all or part of the steps to implement the foregoing method embodiments can be completed by hardware related to program instructions. The foregoing program can be stored in a computer-readable storage medium. When the program is executed, it executes the steps including the foregoing method embodiments; and the foregoing storage medium includes: ROM, RAM, magnetic disk, or optical disk, etc., which can store program codes.

[0190] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery protection method for a range-extended vehicle, characterized in that, Including: Obtain the current temperature of the battery, the current state of charge of the battery, and the starting state of charge of the battery when the vehicle is powered on; If the current temperature is less than the preset charging temperature threshold, then determine the upper limit value of the driving motor power and the upper limit value of the range extender power generation according to whether the current temperature is less than the preset discharging temperature threshold, the current state of charge, and the starting state of charge, where the preset discharging temperature threshold is less than the preset charging temperature threshold; Control the driving motor according to the upper limit value of the driving motor power, and control the range extender according to the upper limit value of the range extender power generation.

2. The method according to claim 1, wherein The determining the upper limit value of the driving motor power and the upper limit value of the range extender power generation according to whether the current temperature is less than the preset discharging temperature threshold, the current state of charge, and the starting state of charge includes: If the current temperature is less than the preset discharging temperature threshold, then determine the upper limit value of the driving motor power and the upper limit value of the range extender power generation according to the current state of charge and the starting state of charge; If the current temperature is greater than or equal to the preset discharging temperature threshold, then determine the upper limit value of the driving motor power as positive infinity, and determine the upper limit value of the range extender power generation according to whether the current temperature is less than the preset grading temperature threshold, where the preset grading temperature threshold is greater than the preset discharging temperature threshold and less than the preset charging temperature threshold.

3. The method according to claim 2, wherein The determining the upper limit value of the driving motor power and the upper limit value of the range extender power generation according to the current state of charge and the starting state of charge includes: If the starting state of charge is greater than the preset first-level power threshold, determine whether the current state of charge is greater than the preset second-level power threshold; If the current state of charge is greater than the preset second-level power threshold, then determine the upper limit value of the range extender power generation as the preset first power generation power, and determine the upper limit value of the driving motor power as positive infinity; If the current state of charge is less than or equal to the preset second-level power threshold, determine whether the current state of charge is greater than the preset third-level power threshold; If the current state of charge is greater than the preset third-level power threshold, then determine the upper limit value of the range extender power generation as the preset first power generation power, and determine the upper limit value of the driving motor power as the preset first operating power; If the current state of charge is less than or equal to the preset third-level power threshold, then determine the upper limit value of the range extender power generation as the preset second power generation power, and determine the upper limit value of the driving motor power as 0; Wherein, the preset first-level power threshold, the preset second-level power threshold, and the preset third-level power threshold decrease in sequence, and the preset first power generation power is greater than the preset second power generation power.

4. The method according to claim 3, characterized in that, The method further includes: If the starting state of charge is greater than the preset fourth-level power threshold and less than or equal to the first-level power threshold, determine whether the current state of charge is greater than the preset second-level power threshold; If the current state of charge is greater than the preset second-level power threshold, determine that the upper limit of the power generation power of the range extender is the preset first power generation power, and determine that the upper limit of the drive motor power is the preset second operating power; If the current state of charge is less than or equal to the preset second-level power threshold, determine whether the current state of charge is greater than the preset third-level power threshold; If the current state of charge is greater than the preset third-level power threshold, determine that the upper limit of the power generation power of the range extender is the preset first power generation power, and determine that the upper limit of the drive motor power is the preset third operating power; If the current state of charge is less than or equal to the preset third-level power threshold, determine that the upper limit of the power generation power of the range extender is the preset second power generation power, and determine that the upper limit of the drive motor power is 0; Wherein, the preset first-level power threshold is less than the preset first-level power threshold, the preset first-level power threshold is greater than the preset second-level power threshold, and the preset third operating power is less than the preset second operating power and the preset first operating power.

5. The method according to claim 4, wherein The method further includes: If the starting state of charge is less than or equal to the preset fourth-level power threshold, determine whether the current state of charge is greater than the preset third-level power threshold; If the current state of charge is greater than the preset third-level power threshold, determine that the upper limit of the power generation power of the range extender is the preset first power generation power, and determine that the upper limit of the drive motor power is the preset third operating power; If the current state of charge is less than or equal to the preset third-level power threshold, determine that the upper limit of the power generation power of the range extender is the preset second power generation power, and determine that the upper limit of the drive motor power is 0.

6. The method according to claim 2, wherein The determining the upper limit of the power generation power of the range extender according to whether the current temperature is less than the preset grading temperature threshold includes: If the current temperature is less than the preset grading temperature threshold, determine that the upper limit of the power generation power of the range extender is the preset third power generation power; If the current temperature is greater than or equal to the preset grading temperature threshold, determine that the upper limit of the power generation power of the range extender is the preset fourth power generation power, and the preset fourth power generation power is greater than the preset third power generation power.

7. A battery protection device for a range-extended vehicle, characterized in that, Includes: An acquisition module for acquiring the current temperature of the battery, the current state of charge of the battery, and the starting state of charge of the battery when the vehicle is powered on; A processing module for, if the current temperature is less than the preset charging temperature threshold, determining the upper limit of the drive motor power and the upper limit of the power generation power of the range extender according to whether the current temperature is less than the preset discharging temperature threshold, and the current state of charge and the starting state of charge, wherein the preset discharging temperature threshold is less than the preset charging temperature threshold; A protection module for controlling the drive motor according to the upper limit of the drive motor power and controlling the range extender according to the upper limit of the power generation power of the range extender.

8. An electronic device, characterized in that, Includes: A processor, a memory, and a communication interface; The memory is used for storing the executable instructions of the processor; Wherein, the processor is configured to execute the battery protection method of the range-extended vehicle according to any one of claims 1 to 6 by executing the executable instructions.

9. A readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the battery protection method of the range-extended vehicle according to any one of claims 1 to 6.

10. A computer program product, characterized in that, It includes a computer program which is used to implement the battery protection method of the range-extended vehicle according to any one of claims 1 to 6 when executed by a processor.

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