New energy automobile intelligent electricity supplementing method and system in low-temperature environment

Abstract

The invention belongs to the technical field of new energy automobiles. According to the intelligent charging method and system for the new energy automobile in the low-temperature environment, a low-voltage storage battery temperature detection function and a low-voltage storage battery heating function are added, meanwhile, the working states of the automobile are divided into a high-voltage working state, a low-voltage power supply state and a dormant state, and the temperature of the low-voltage storage battery is detected in each state; when the temperature of the low-voltage storage battery is low, the low-voltage storage battery is heated and the temperature of the low-voltage storage battery is increased to a proper range, and then the low-voltage storage battery is charged, so that the intelligent charging efficiency of the vehicle in a low-temperature environment is ensured; in the low-voltage power supply state and the dormant state, the whole vehicle controller conducts state detection on the DCDC, the high-voltage battery system and the whole vehicle, electricity is supplemented only when the DCDC, the high-voltage battery system and the whole vehicle are free of faults, different working conditions of the vehicle are considered, safety and reliability are achieved, and the feed risk caused by the fact that the vehicle is not used for a long time can be effectively prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy electric vehicles, and in particular to an intelligent power replenishment method and system for new energy vehicles in a low temperature environment. Background Art

[0002] The statements in this section merely provide background art related to the present invention and do not necessarily constitute prior art.

[0003] In recent years, with the advancement of technology and the improvement of the industrial chain, the domestic new energy electric vehicle industry has developed rapidly. The share of new energy vehicles in the market has increased year by year, and the share of new energy vehicles will further increase in the future. New energy vehicles will be an important direction for the future development of automobiles. New energy vehicles need to have stronger adaptability and need to be able to adapt to their respective road conditions and various climates. Only in this way can new energy vehicles truly develop.

[0004] Compared with traditional fuel vehicles, new energy electric vehicles have more onboard electrical appliances. More electrical appliances mean a stronger reliance on electricity, and at the same time, higher requirements are placed on the continuous power supply capacity of the low-voltage battery system. If the vehicle does not have the ability to intelligently replenish electricity, the vehicle will be stationary for a long time without use, which will cause the low-voltage battery system to be powered on, and the vehicle will not be able to start, which will cause certain damage to the low-voltage battery system. Although existing new energy electric vehicles have certain intelligent replenishment capabilities. For example, patent number CN113771624A discloses a new energy vehicle intelligent replenishment method, which is mainly aimed at replenishment at normal temperature. When the temperature is lower than the set stability threshold (for example, -5°C), the charging capacity of the low-voltage battery system will be significantly affected, and the existing replenishment method cannot achieve stable replenishment control. Summary of the invention

[0005] In order to address the deficiencies in the prior art, the present invention provides a method and system for intelligent power replenishment of new energy vehicles in a low-temperature environment, which overcomes the limitations of conventional power replenishment methods at low temperatures and achieves safe and intelligent power replenishment of vehicles in a low-temperature environment.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] In a first aspect, the present invention provides a method for intelligently charging new energy vehicles in a low temperature environment.

[0008] A smart charging method for new energy vehicles in a low temperature environment is applied to a high voltage power supply state, when all controllers of the vehicle are in an awake state, including the following processes:

[0009] Obtain low-voltage battery temperature and low-voltage battery voltage;

[0010] When the voltage of the low-voltage battery is less than the first voltage threshold and the temperature of the low-voltage battery is higher than the temperature threshold, the high voltage is applied to the vehicle to supplement the low-voltage battery;

[0011] When the voltage of the low-voltage battery is less than the first voltage threshold and the temperature of the low-voltage battery is less than or equal to the temperature threshold, the low-voltage battery is heated. When the temperature of the low-voltage battery is greater than or equal to the temperature threshold, the heating is stopped, so that the high voltage is applied to the whole vehicle to supplement the low-voltage battery.

[0012] When the low-voltage battery voltage is greater than or equal to the second voltage threshold, the high voltage is lowered, the charging circuit is disconnected, and the charging is completed.

[0013] In a second aspect, the present invention provides an intelligent power replenishment system for new energy vehicles in a low temperature environment.

[0014] An intelligent charging system for new energy vehicles in a low temperature environment is applied to a high voltage power supply state, when all controllers of the vehicle are in an awake state, including the following processes:

[0015] The data acquisition unit is configured to: acquire the low-voltage battery temperature and the low-voltage battery voltage;

[0016] The first control unit is configured to: when the voltage of the low-voltage battery is less than the first voltage threshold and the temperature of the low-voltage battery is higher than the temperature threshold, enable the vehicle to be high voltage to supplement the low-voltage battery;

[0017] The second control unit is configured to: when the voltage of the low-voltage battery is less than the first voltage threshold and the temperature of the low-voltage battery is less than or equal to the temperature threshold, heat the low-voltage battery, and when the temperature of the low-voltage battery is greater than or equal to the temperature threshold, stop heating, so that the whole vehicle is high voltage, and replenish the low-voltage battery;

[0018] The third control unit is configured to: when the voltage of the low-voltage battery is greater than or equal to the second voltage threshold, lower the high voltage, disconnect the charging circuit, and complete the charging.

[0019] In a third aspect, the present invention provides an intelligent power replenishment system for new energy vehicles in a low temperature environment.

[0020] An intelligent power replenishment system for new energy vehicles in a low temperature environment, comprising:

[0021] DCDC, slow charging relay, low-voltage battery temperature detection device, low-voltage voltage detection module, low-voltage battery heating device and control unit, one end of the slow charging relay is connected to the DCDC, and the other end of the slow charging relay is used to connect to the low-voltage battery;

[0022] The DCDC is connected to the high-voltage battery, the low-voltage battery temperature detection device is connected to the low-voltage battery to detect the temperature of the low-voltage battery, the low-voltage voltage detection module is connected to the low-voltage battery to detect the voltage of the low-voltage battery, the low-voltage battery heating device is used to heat the low-voltage battery, and the slow-charging relay, the low-voltage battery temperature detection device and the low-voltage voltage detection module are respectively connected to the control unit;

[0023] The low-voltage battery temperature is detected by a low-voltage battery temperature detection device, and the low-voltage battery voltage is detected by a low-voltage voltage detection module;

[0024] When the voltage of the low-voltage battery is less than the first voltage threshold and the temperature of the low-voltage battery is greater than the temperature threshold, the slow charging relay is closed and the vehicle is high voltage, and the DCDC replenishes the low-voltage battery;

[0025] When the low-voltage battery voltage is lower than the first voltage threshold but the low-voltage battery temperature is less than or equal to the temperature threshold, the low-voltage battery heating device starts to heat the low-voltage battery. When the low-voltage battery temperature is greater than or equal to the temperature threshold, the heating stops, the slow charging relay closes, and the vehicle is high-voltage, and the DCDC replenishes the low-voltage battery.

[0026] When it is detected that the low-voltage battery voltage is greater than or equal to the second voltage threshold, the DCDC stops working, the high voltage is lowered, the slow charging relay is disconnected, and the charging is completed.

[0027] As a further limitation of the third aspect of the present invention, the control unit is a vehicle controller; or, the control unit is a supplementary power controller that is communicatively connected to the vehicle controller.

[0028] In a fourth aspect, the present invention provides a method for intelligently charging new energy vehicles in a low temperature environment.

[0029] A smart power replenishment method for new energy vehicles in a low-temperature environment, applied in a low-voltage power supply state, includes the following processes:

[0030] Obtain low-voltage battery temperature and low-voltage battery voltage;

[0031] When the voltage of the low-voltage battery is less than the first voltage threshold and the temperature of the low-voltage battery is higher than the temperature threshold, the status of the DCDC, the high-voltage battery system and the whole vehicle is detected. If there is no fault in the DCDC, the high-voltage battery and the whole vehicle, the high voltage on the whole vehicle supplements the power of the low-voltage battery, wherein the DCDC is connected between the high-voltage battery and the low-voltage battery;

[0032] When the voltage of the low-voltage battery is less than the first voltage threshold, and the temperature of the low-voltage battery is less than or equal to the temperature threshold, the low-voltage battery is heated. When the battery temperature is greater than or equal to the temperature threshold, the heating is stopped, and the status of the DCDC, high-voltage battery system and the whole vehicle is detected. If there is no fault in the DCDC, high-voltage battery and the whole vehicle, the high voltage on the whole vehicle supplements the low-voltage battery.

[0033] When the low-voltage battery voltage is greater than or equal to the second voltage threshold, the DCDC stops working, lowers the high voltage, disconnects the charging circuit, and the charging is completed.

[0034] In a fifth aspect, the present invention provides an intelligent power replenishment system for new energy vehicles in a low temperature environment.

[0035] An intelligent power supply system for new energy vehicles in a low temperature environment, applied in a low voltage power supply state, includes:

[0036] The data acquisition unit is configured to: acquire the low-voltage battery temperature and the low-voltage battery voltage;

[0037] The first power replenishment control unit is configured to: when the voltage of the low-voltage battery is less than the first voltage threshold and the temperature of the low-voltage battery is higher than the temperature threshold, perform status detection on the DCDC, the high-voltage battery system and the whole vehicle, and if the DCDC, the high-voltage battery and the whole vehicle are not faulty, the high voltage on the whole vehicle replenishes the power for the low-voltage battery, wherein the DCDC is connected between the high-voltage battery and the low-voltage battery;

[0038] The second power replenishment control unit is configured to: when the voltage of the low-voltage battery is less than the first voltage threshold and the temperature of the low-voltage battery is less than or equal to the temperature threshold, heat the low-voltage battery, and when the battery temperature is greater than or equal to the temperature threshold, stop heating, and perform status detection on the DCDC, the high-voltage battery system and the whole vehicle. If the DCDC, the high-voltage battery and the whole vehicle are fault-free, the high voltage on the whole vehicle replenishes the low-voltage battery;

[0039] The third power replenishment control unit is configured to: when the voltage of the low-voltage battery is greater than or equal to the second voltage threshold, lower the high voltage, disconnect the charging circuit, and complete the power replenishment.

[0040] In a sixth aspect, the present invention provides an intelligent power replenishment system for new energy vehicles in a low temperature environment.

[0041] An intelligent power replenishment system for new energy vehicles in a low temperature environment, comprising:

[0042] DCDC, slow charging relay, low-voltage battery temperature detection device, low-voltage voltage detection module, low-voltage battery temperature detection device and vehicle controller, one end of the slow charging relay is connected to the DCDC, and the other end of the slow charging relay is used to connect to the low-voltage battery;

[0043] The DCDC is connected to the high-voltage battery, the low-voltage battery temperature detection device is connected to the low-voltage battery to detect the temperature of the low-voltage battery, the low-voltage voltage detection module is connected to the low-voltage battery to detect the voltage of the low-voltage battery, the slow-charging relay, the low-voltage battery temperature detection device and the low-voltage voltage detection module are respectively connected to the vehicle controller, and the low-voltage battery heating device is used to heat the low-voltage battery;

[0044] The low-voltage battery temperature is detected by a low-voltage battery temperature detection device, and the low-voltage battery voltage is detected by a low-voltage voltage detection module;

[0045] When the low-voltage battery voltage is less than the first voltage threshold and the low-voltage battery temperature is greater than the temperature threshold, the vehicle controller performs status detection on the DCDC, high-voltage battery system and the vehicle. If there is no fault in the DCDC, high-voltage battery and the vehicle, the high-voltage and slow-charging relays on the vehicle are closed, and the DCDC replenishes the low-voltage battery.

[0046] When the low-voltage battery voltage is less than the first voltage threshold but the low-voltage battery temperature is less than or equal to the temperature threshold, the low-voltage battery heating device starts to heat the low-voltage battery. When the low-voltage battery temperature is greater than or equal to the temperature threshold, the heating is stopped. The vehicle controller performs status detection on the DCDC, high-voltage battery system, and the vehicle. If there is no fault in the DCDC, high-voltage battery, and the vehicle, the high-voltage and slow-charging relays on the vehicle are closed, and the DCDC replenishes the low-voltage battery.

[0047] When it is detected that the low-voltage battery voltage is greater than or equal to the second voltage threshold, the DCDC stops working, the high voltage is lowered, the slow charging relay is disconnected, and the charging is completed.

[0048] In a seventh aspect, the present invention provides a method for intelligently charging new energy vehicles in a low temperature environment.

[0049] A smart charging method for new energy vehicles in a low temperature environment, applied in a dormant state, includes the following processes:

[0050] The low-voltage battery temperature detection device is awakened at a fixed time to detect the low-voltage battery voltage. When the low-voltage battery voltage is less than or equal to a third voltage threshold, the VCU is awakened and the low-voltage battery temperature is obtained at the same time. When the low-voltage battery temperature is less than the temperature threshold, the low-voltage battery is heated.

[0051] When the battery temperature is greater than or equal to the temperature threshold, the heating is stopped and the status of the DCDC, high-voltage battery system and the vehicle is checked. If there is no fault in the DCDC, high-voltage battery and the vehicle, the high voltage on the vehicle supplements the low-voltage battery.

[0052] If the temperature of the low-voltage battery is greater than the temperature threshold, the status of the DCDC, high-voltage battery system, and the entire vehicle is checked. If there is no fault in the DCDC, high-voltage battery, and the entire vehicle, the high voltage on the entire vehicle will supplement the low-voltage battery.

[0053] When the low-voltage battery voltage is greater than or equal to the second voltage threshold, the high voltage is lowered, the charging circuit is disconnected, and the charging is completed.

[0054] In an eighth aspect, the present invention provides an intelligent power replenishment system for new energy vehicles in a low temperature environment.

[0055] An intelligent power replenishment system for new energy vehicles in a low temperature environment, applied in a dormant state, comprises:

[0056] The low-voltage battery heating unit is configured to: regularly wake up the low-voltage battery temperature detection device to detect the low-voltage battery voltage, wake up the VCU when the low-voltage battery voltage is less than or equal to a third voltage threshold, and simultaneously obtain the low-voltage battery temperature, and heat the low-voltage battery when the low-voltage battery temperature is less than the temperature threshold;

[0057] The first control unit is configured to: when the battery temperature is greater than or equal to the temperature threshold, stop heating, perform status detection on the DCDC, the high-voltage battery system and the whole vehicle, and if the DCDC, the high-voltage battery and the whole vehicle are not faulty, the high voltage on the whole vehicle supplements the low-voltage battery;

[0058] The second control unit is configured to: if the temperature of the low-voltage battery is greater than the temperature threshold, perform status detection on the DCDC, the high-voltage battery system, and the entire vehicle; if the DCDC, the high-voltage battery, and the entire vehicle are not faulty, the high voltage on the entire vehicle supplements the low-voltage battery;

[0059] The third control unit is configured to: when the voltage of the low-voltage battery is greater than or equal to the second voltage threshold, lower the high voltage, disconnect the charging circuit, and complete the charging.

[0060] In a ninth aspect, the present invention provides an intelligent power replenishment system for new energy vehicles in a low temperature environment.

[0061] An intelligent power replenishment system for new energy vehicles in a low temperature environment, applied in a dormant state, comprises:

[0062] DCDC, slow charging relay, low-voltage battery temperature detection device, low-voltage voltage detection module, low-voltage battery temperature detection device and vehicle controller, one end of the slow charging relay is connected to the DCDC, and the other end of the slow charging relay is used to connect to the low-voltage battery;

[0063] The DCDC is connected to the high-voltage battery, the low-voltage battery temperature detection device is connected to the low-voltage battery to detect the temperature of the low-voltage battery, the low-voltage voltage detection module is connected to the low-voltage battery to detect the voltage of the low-voltage battery, the slow-charging relay, the low-voltage battery temperature detection device and the low-voltage voltage detection module are respectively connected to the vehicle controller, and the low-voltage battery heating device is used to heat the low-voltage battery;

[0064] When it is detected that the low-voltage battery voltage is less than or equal to the third voltage threshold, the vehicle controller is awakened and the low-voltage battery temperature is detected at the same time. When it is detected that the low-voltage battery temperature is less than the temperature threshold, the low-voltage battery heating device is started to heat the low-voltage battery. When the battery temperature is greater than or equal to the temperature threshold, the heating is stopped. The vehicle controller performs status detection on the DCDC, high-voltage battery system and the vehicle. If there is no fault in the DCDC, high-voltage battery and the vehicle, the high-voltage and slow-charging relays on the vehicle are closed, and the DCDC replenishes the low-voltage battery.

[0065] If it is detected that the temperature of the low-voltage battery is greater than the temperature threshold, the vehicle will perform status detection on the DCDC, high-voltage battery system, and the vehicle. If there is no fault in the DCDC, high-voltage battery, and the vehicle, the high-voltage and slow-charging relays on the vehicle will be closed, and the DCDC will replenish the low-voltage battery.

[0066] When it is detected that the low-voltage battery voltage is greater than or equal to the second voltage threshold, the DCDC stops working, the high voltage is lowered, the slow charging relay is disconnected, the charging is completed, and the relevant controller re-enters sleep.

[0067] As a further limitation of the ninth aspect of the present invention, the low-voltage battery temperature detection device adopts the vehicle's own battery management system. The battery management system uses an internal clock to count time during sleep period, automatically wakes up at a set time interval, starts timing after the vehicle is powered off, and resets the timing after the power is replenished and the vehicle enters sleep.

[0068] In a tenth aspect, the present invention provides an intelligent power replenishment system for new energy vehicles in a low temperature environment.

[0069] An intelligent power replenishment system for new energy vehicles in a low temperature environment, comprising:

[0070] The high-voltage power replenishment unit is configured to: execute the intelligent power replenishment method for new energy vehicles in a low-temperature environment according to the first aspect of the present invention;

[0071] The low-voltage power supply unit is configured to: execute the intelligent power supply method for new energy vehicles in a low-temperature environment according to the fourth aspect of the present invention;

[0072] The dormant power replenishing unit is configured to: execute the intelligent power replenishing method for new energy vehicles in a low temperature environment as described in the seventh aspect of the present invention.

[0073] In an eleventh aspect, the present invention provides a computer device, comprising: a processor and a computer-readable storage medium;

[0074] a processor adapted to execute a computer program;

[0075] A computer-readable storage medium, wherein a computer program is stored in the computer-readable storage medium, and when the computer program is executed by the processor, the intelligent power replenishment method for new energy vehicles in a low temperature environment as described in claim 1 as described in the first aspect, the fourth aspect, or the seventh aspect of the present invention is implemented.

[0076] In the twelfth aspect, the present invention provides a computer-readable storage medium, which stores a computer program, and the computer program is suitable for being loaded by a processor and executing the intelligent power replenishment method for new energy vehicles in a low temperature environment as described in claim 1 as described in the first aspect, the fourth aspect or the seventh aspect of the present invention.

[0077] In the thirteenth aspect, the present invention provides a computer program product, characterized in that the computer program product includes a computer program, and when the computer program is executed by a processor, it implements the intelligent power replenishment method for new energy vehicles in a low temperature environment as described in claim 1 as described in the first aspect, the fourth aspect or the seventh aspect of the present invention.

[0078] Compared with the prior art, the present invention has the following beneficial effects:

[0079] 1. The present invention innovatively proposes an intelligent power replenishment strategy for new energy vehicles in low temperature environments, adds low-voltage battery temperature detection function and low-voltage battery heating function, and divides the vehicle's working state into high-voltage working state, low-voltage power supply state and sleep state, and detects the low-voltage battery temperature in each state. When the low-voltage battery temperature is low, the low-voltage battery is heated to increase the low-voltage battery temperature to an appropriate range, and then the low-voltage battery is charged to ensure the efficiency of the vehicle's intelligent power replenishment in low temperature environments.

[0080] 2. In the low-voltage power supply state and the sleep state, the vehicle controller detects the status of the DCDC, high-voltage battery system, and the entire vehicle. It only recharges the power when there are no faults in the DCDC, high-voltage battery, and the entire vehicle. It takes into account the different working conditions of the vehicle, is safer and more reliable, and can effectively prevent the risk of power supply caused by long-term non-use of the vehicle.

[0081] Advantages of additional aspects of the present invention will be given in part in the following description, and in part will become obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0082] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0083] Figure 1 A schematic diagram of the working process of the intelligent power replenishment system for new energy vehicles in a low temperature environment provided by Embodiment 1 of the present invention;

[0084] Figure 2 A schematic diagram of a flow chart of an intelligent power replenishment method for a new energy vehicle in a low temperature environment provided by Embodiment 2 of the present invention;

[0085] Figure 3 A schematic diagram of an intelligent power replenishment system for new energy vehicles in a low temperature environment provided by Embodiment 3 of the present invention;

[0086] Figure 4 A schematic diagram of a flow chart of an intelligent power replenishment method for a new energy vehicle in a low temperature environment provided by Embodiment 4 of the present invention;

[0087] Figure 5 A schematic diagram of an intelligent power replenishment system for new energy vehicles in a low temperature environment provided by Embodiment 5 of the present invention;

[0088] Figure 6 A schematic diagram of a flow chart of an intelligent power replenishment method for a new energy vehicle in a low temperature environment provided by Embodiment 7 of the present invention;

[0089] Figure 7 A schematic diagram of an intelligent power replenishment system for new energy vehicles in a low temperature environment provided by Embodiment 8 of the present invention;

[0090] Figure 8 A schematic diagram of an intelligent power replenishment system for new energy vehicles in a low temperature environment provided by Embodiment 10 of the present invention;

[0091] Fig. 9 A schematic diagram of a computer device provided for Example 11 of the present invention. DETAILED DESCRIPTION

[0092] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0093] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0094] In the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

[0095] Embodiment 1:

[0096] This implementation method provides an intelligent power replenishment system for new energy vehicles in a low temperature environment, including:

[0097] DCDC, slow charging relay, low-voltage battery temperature detection device, low-voltage voltage detection module, low-voltage battery heating device and control unit, one end of the slow charging relay (controlled by BMS) is connected to the DCDC, and the other end of the slow charging relay is used to connect to the low-voltage battery;

[0098] The DCDC is connected to the high-voltage battery, the low-voltage battery temperature detection device is connected to the low-voltage battery to detect the temperature of the low-voltage battery, the low-voltage voltage detection module is connected to the low-voltage battery to detect the voltage of the low-voltage battery, the low-voltage battery heating device is used to heat the low-voltage battery, and the slow charging relay, the low-voltage battery temperature detection device and the low-voltage voltage detection module are respectively connected to the control unit.

[0099] Working process as Figure 1 As shown, each control module has self-checked and has no faults, can work normally, the whole vehicle has no faults, the vehicle high voltage is connected and the vehicle can drive normally. At this time, the low-voltage battery system can detect the voltage and temperature through the low-voltage voltage detection module and the low-voltage battery temperature detection module (if not available, it needs to be added additionally);

[0100] When it is detected that the low-voltage battery voltage is ≤ V1 (i.e., the first voltage threshold) and the low-voltage battery temperature is greater than or equal to T (i.e., the temperature threshold), the VCU (i.e., the vehicle control unit) issues a slow charging relay closure command to the BMS and a high-voltage command to the DCDC, and the DCDC starts working to replenish the low-voltage battery;

[0101] When it is detected that the low-voltage battery voltage is ≤ V1 but the low-voltage battery temperature is less than T, the battery heating system is started to raise the low-voltage battery temperature to the temperature threshold T, the VCU issues a slow-charge relay closure command to the BMS, and issues a high-voltage command to the DCDC, and the DCDC starts working to replenish the low-voltage battery;

[0102] When the VCU detects that the low-voltage battery voltage is ≥ V2 (ie, the second voltage threshold), the VCU powers off the DCDC, the DCDC stops working, the BMS is disconnected, and the power replenishment is completed.

[0103] Embodiment 2:

[0104] like Figure 2 As shown, this implementation proposes an intelligent charging method for new energy vehicles in a low temperature environment, which is applied to a high voltage power supply state. At this time, all controllers of the vehicle are in an awake state, including the following processes:

[0105] S1.1: Obtain low-voltage battery temperature and low-voltage battery voltage;

[0106] S1.2: When the voltage of the low-voltage battery is less than the first voltage threshold and the temperature of the low-voltage battery is higher than the temperature threshold, the high voltage is applied to the vehicle to supplement the low-voltage battery;

[0107] S1.3: When the voltage of the low-voltage battery is less than the first voltage threshold and the temperature of the low-voltage battery is less than or equal to the temperature threshold, the low-voltage battery is heated. When the temperature of the low-voltage battery is greater than or equal to the temperature threshold, the heating is stopped, so that the high voltage is applied to the vehicle to replenish the low-voltage battery;

[0108] S1.4: When the low-voltage battery voltage is greater than or equal to the second voltage threshold, the high voltage is lowered, the charging circuit is disconnected, and the charging is completed.

[0109] Embodiment 3:

[0110] like Figure 3 As shown, this implementation method provides an intelligent power replenishment system for new energy vehicles in a low temperature environment, which is applied to a high voltage power supply state. At this time, all controllers of the vehicle are in an awake state, including the following processes:

[0111] The data acquisition unit is configured to: acquire the low-voltage battery temperature and the low-voltage battery voltage;

[0112] The first control unit is configured to: when the voltage of the low-voltage battery is less than the first voltage threshold and the temperature of the low-voltage battery is higher than the temperature threshold, enable the vehicle to be high voltage to supplement the low-voltage battery;

[0113] The second control unit is configured to: when the voltage of the low-voltage battery is less than the first voltage threshold and the temperature of the low-voltage battery is less than or equal to the temperature threshold, heat the low-voltage battery, and when the temperature of the low-voltage battery is greater than or equal to the temperature threshold, stop heating, so that the whole vehicle is high voltage, and replenish the low-voltage battery;

[0114] The third control unit is configured to: when the voltage of the low-voltage battery is greater than or equal to the second voltage threshold, lower the high voltage, disconnect the charging circuit, and complete the charging.

[0115] It is understandable that the above-mentioned various units can be respectively or all combined into one or several other units to constitute, or some (some) units therein can also be split into multiple smaller units in function to constitute, which can achieve the same operation without affecting the realization of the technical effects of the embodiments of the present application. The above-mentioned units are divided based on logical functions. In practical applications, the function of a unit can also be realized by multiple units, or the function of multiple units can be realized by one unit. In other embodiments of the present application, the system can also include other units. In practical applications, these functions can also be implemented with the assistance of other units, and can be implemented by the collaboration of multiple units.

[0116] According to another embodiment of the present application, the system described in this embodiment can be constructed, and the method of Example 1 of the present application can be implemented by running a computer program (including program code) capable of executing the steps involved in the corresponding method described in Example 1 on a general computing device such as a computer including processing elements and storage elements such as a central processing unit (CPU), random access memory (RAM), and read-only memory (ROM). The computer program can be recorded on, for example, a computer-readable recording medium, and loaded into the above-mentioned computing device through the computer-readable recording medium and run therein.

[0117] Embodiment 4:

[0118] like Figure 4 As shown, this implementation provides a method for intelligent power replenishment of new energy vehicles in a low temperature environment, which is applied to a low voltage power supply state and includes the following processes:

[0119] S4.1: Obtain low-voltage battery temperature and low-voltage battery voltage;

[0120] S4.2: When the voltage of the low-voltage battery is less than the first voltage threshold and the temperature of the low-voltage battery is higher than the temperature threshold, the DCDC, the high-voltage battery system and the vehicle are checked for status. If the DCDC, the high-voltage battery and the vehicle are not faulty, the high voltage on the vehicle supplements the low-voltage battery, wherein the DCDC is connected between the high-voltage battery and the low-voltage battery;

[0121] S4.3: When the voltage of the low-voltage battery is less than the first voltage threshold and the temperature of the low-voltage battery is less than or equal to the temperature threshold, the low-voltage battery is heated. When the battery temperature is greater than or equal to the temperature threshold, the heating is stopped and the status of the DCDC, high-voltage battery system and the vehicle is checked. If there is no fault in the DCDC, high-voltage battery and the vehicle, the high voltage on the vehicle supplements the low-voltage battery.

[0122] S4.4: When the low-voltage battery voltage is greater than or equal to the second voltage threshold, the DCDC stops working, lowers the high voltage, disconnects the charging circuit, and the charging is completed.

[0123] Embodiment 5:

[0124] like Figure 5 As shown, this implementation method provides an intelligent power replenishment system for new energy vehicles in a low temperature environment, which is applied to a low voltage power supply state, including:

[0125] The data acquisition unit is configured to: acquire the low-voltage battery temperature and the low-voltage battery voltage;

[0126] The first power replenishment control unit is configured to: when the voltage of the low-voltage battery is less than the first voltage threshold and the temperature of the low-voltage battery is higher than the temperature threshold, perform status detection on the DCDC, the high-voltage battery system and the whole vehicle, and if the DCDC, the high-voltage battery and the whole vehicle are not faulty, the high voltage on the whole vehicle replenishes the power for the low-voltage battery, wherein the DCDC is connected between the high-voltage battery and the low-voltage battery;

[0127] The second power replenishment control unit is configured to: when the voltage of the low-voltage battery is less than the first voltage threshold and the temperature of the low-voltage battery is less than or equal to the temperature threshold, heat the low-voltage battery, and when the battery temperature is greater than or equal to the temperature threshold, stop heating, and perform status detection on the DCDC, the high-voltage battery system and the whole vehicle. If the DCDC, the high-voltage battery and the whole vehicle are fault-free, the high voltage on the whole vehicle replenishes the low-voltage battery;

[0128] The third power replenishment control unit is configured to: when the voltage of the low-voltage battery is greater than or equal to the second voltage threshold, lower the high voltage, disconnect the charging circuit, and complete the power replenishment.

[0129] It is understandable that the above-mentioned various units can be respectively or all combined into one or several other units to constitute, or some (some) units therein can also be split into multiple smaller units in function to constitute, which can achieve the same operation without affecting the realization of the technical effects of the embodiments of the present application. The above-mentioned units are divided based on logical functions. In practical applications, the function of a unit can also be realized by multiple units, or the function of multiple units can be realized by one unit. In other embodiments of the present application, the system can also include other units. In practical applications, these functions can also be implemented with the assistance of other units, and can be implemented by the collaboration of multiple units.

[0130] According to another embodiment of the present application, the system described in this embodiment can be constructed, and the method of Example 1 of the present application can be implemented by running a computer program (including program code) capable of executing the steps involved in the corresponding method described in Example 1 on a general computing device such as a computer including processing elements and storage elements such as a central processing unit (CPU), random access memory (RAM), and read-only memory (ROM). The computer program can be recorded on, for example, a computer-readable recording medium, and loaded into the above-mentioned computing device through the computer-readable recording medium and run therein.

[0131] Embodiment 6:

[0132] This implementation method provides an intelligent power replenishment system for new energy vehicles in a low temperature environment, including:

[0133] DCDC, slow charging relay, low-voltage battery temperature detection device, low-voltage voltage detection module, low-voltage battery temperature detection device and vehicle controller, one end of the slow charging relay (controlled by BMS) is connected to DCDC, and the other end of the slow charging relay is used to connect to the low-voltage battery;

[0134] The DCDC is connected to the high-voltage battery, the low-voltage battery temperature detection device is connected to the low-voltage battery to detect the temperature of the low-voltage battery, the low-voltage voltage detection module is connected to the low-voltage battery to detect the voltage of the low-voltage battery, the slow-charging relay, the low-voltage battery temperature detection device and the low-voltage voltage detection module are respectively connected to the vehicle controller (i.e., VCU), and the low-voltage battery heating device is used to heat the low-voltage battery;

[0135] The vehicle is in a low-voltage power supply state (the low-voltage part can work), and the high-voltage part is not working. At this time, the low-voltage battery system can detect the voltage and temperature through the VCU low-voltage voltage detection module and the low-voltage battery temperature detection module (if not available, it needs to be added additionally);

[0136] When it is detected that the low-voltage battery voltage is ≤ V1 and the low-voltage battery temperature is greater than or equal to T, the VCU detects the DCDC, power battery, and vehicle status. If there is no fault, the VCU issues a slow charging relay closure command to the BMS and a high-voltage command to the DCDC, and the DCDC starts working to replenish the low-voltage battery.

[0137] When it is detected that the low-voltage battery voltage is ≤V1 but the low-voltage battery temperature is less than T, the battery heating system is started to raise the low-voltage battery temperature to T, the VCU issues a slow charging relay closure command to the BMS, and issues a high-voltage command to the DCDC, and the DCDC starts working to replenish the low-voltage battery; when the VCU detects that the low-voltage battery voltage is ≥V2, the VCU powers off the DCDC, the DCDC stops working, the BMS is disconnected, and the charging is completed.

[0138] Embodiment 7:

[0139] like Figure 6 As shown, this implementation provides a method for intelligent charging of new energy vehicles in a low temperature environment, which is applied to the dormant state and includes the following processes:

[0140] S7.1: Timely wake up the low-voltage battery temperature detection device to detect the low-voltage battery voltage. When the low-voltage battery voltage is less than or equal to the third voltage threshold, wake up the VCU and obtain the low-voltage battery temperature at the same time. When the low-voltage battery temperature is less than the temperature threshold, heat the low-voltage battery.

[0141] S7.2: When the battery temperature is greater than or equal to the temperature threshold, stop heating and perform status detection on the DCDC, high-voltage battery system and the vehicle. If there is no fault in the DCDC, high-voltage battery and the vehicle, the high voltage on the vehicle supplements the low-voltage battery.

[0142] S7.3: If the temperature of the low-voltage battery is greater than the temperature threshold, the DCDC, high-voltage battery system, and the vehicle are checked for status. If there are no faults in the DCDC, high-voltage battery, and the vehicle, the high voltage on the vehicle supplements the low-voltage battery.

[0143] S7.4: When the low-voltage battery voltage is greater than or equal to the second voltage threshold, the high voltage is lowered, the charging circuit is disconnected, and the charging is completed.

[0144] Embodiment 8:

[0145] like Figure 7 As shown, this implementation method provides an intelligent power replenishment system for new energy vehicles in a low temperature environment, which is applied to a dormant state and includes:

[0146] The low-voltage battery heating unit is configured to: regularly wake up the low-voltage battery temperature detection device to detect the low-voltage battery voltage, wake up the VCU when the low-voltage battery voltage is less than or equal to a third voltage threshold, and simultaneously obtain the low-voltage battery temperature, and heat the low-voltage battery when the low-voltage battery temperature is less than the temperature threshold;

[0147] The first control unit is configured to: when the battery temperature is greater than or equal to the temperature threshold, stop heating, perform status detection on the DCDC, the high-voltage battery system and the whole vehicle, and if the DCDC, the high-voltage battery and the whole vehicle are not faulty, the high voltage on the whole vehicle supplements the low-voltage battery;

[0148] The second control unit is configured to: if the temperature of the low-voltage battery is greater than the temperature threshold, perform status detection on the DCDC, the high-voltage battery system, and the entire vehicle; if the DCDC, the high-voltage battery, and the entire vehicle are not faulty, the high voltage on the entire vehicle supplements the low-voltage battery;

[0149] The third control unit is configured to: when the voltage of the low-voltage battery is greater than or equal to the second voltage threshold, lower the high voltage, disconnect the charging circuit, and complete the charging.

[0150] It is understandable that the above-mentioned various units can be respectively or all combined into one or several other units to constitute, or some (some) units therein can also be split into multiple smaller units in function to constitute, which can achieve the same operation without affecting the realization of the technical effects of the embodiments of the present application. The above-mentioned units are divided based on logical functions. In practical applications, the function of a unit can also be realized by multiple units, or the function of multiple units can be realized by one unit. In other embodiments of the present application, the system can also include other units. In practical applications, these functions can also be implemented with the assistance of other units, and can be implemented by the collaboration of multiple units.

[0151] According to another embodiment of the present application, the system described in this embodiment can be constructed, and the method of Example 1 of the present application can be implemented by running a computer program (including program code) capable of executing the steps involved in the corresponding method described in Example 1 on a general computing device such as a computer including processing elements and storage elements such as a central processing unit (CPU), random access memory (RAM), and read-only memory (ROM). The computer program can be recorded on, for example, a computer-readable recording medium, and loaded into the above-mentioned computing device through the computer-readable recording medium and run therein.

[0152] Embodiment 9:

[0153] This implementation provides an intelligent power replenishment system for new energy vehicles in a low temperature environment, which is applied to a dormant state and includes:

[0154] DCDC, slow charging relay, low-voltage battery temperature detection device, low-voltage voltage detection module, low-voltage battery temperature detection device and vehicle controller, one end of the slow charging relay (controlled by BMS) is connected to DCDC, and the other end of the slow charging relay is used to connect to the low-voltage battery;

[0155] The DCDC is connected to the high-voltage battery, the low-voltage battery temperature detection device is connected to the low-voltage battery to detect the temperature of the low-voltage battery, the low-voltage voltage detection module is connected to the low-voltage battery to detect the voltage of the low-voltage battery, the slow-charging relay, the low-voltage battery temperature detection device and the low-voltage voltage detection module are respectively connected to the vehicle controller (i.e., VCU), and the low-voltage battery heating device is used to heat the low-voltage battery;

[0156] The vehicle is in a dormant state, and both the high and low voltages are not working. The BMS is woken up regularly to detect the low-voltage battery voltage. When it is detected that the low-voltage battery voltage is ≤ the third voltage threshold V3, the VCU is woken up and the low-voltage battery temperature is detected at the same time;

[0157] When it is detected that the temperature of the low-voltage battery is lower than the temperature threshold T, the low-voltage battery heating device starts to heat the low-voltage battery. When the battery temperature rises to the threshold T, the heating stops. The VCU performs status detection on the DCDC, high-voltage battery system, and the vehicle. If there is no fault in the DCDC, high-voltage battery, and the vehicle, the high-voltage and slow-charging relays on the vehicle are closed, and the DCDC replenishes the power for the low-voltage battery.

[0158] If it is detected that the temperature of the low-voltage battery is higher than the temperature threshold T, the VCU will perform status detection on the DCDC, high-voltage battery system, and the entire vehicle. If there is no fault in the DCDC, high-voltage battery, and the entire vehicle, the high-voltage and slow-charging relays on the entire vehicle will be closed, and the DCDC will replenish the power for the low-voltage battery.

[0159] When it is detected that the low-voltage battery voltage is ≥ the second voltage threshold V2, the DCDC stops working, the high voltage is lowered, the slow charging relay is disconnected, the intelligent charging is completed, and the relevant controller re-enters sleep.

[0160] In the present implementation, preferably, the low-voltage battery temperature detection device adopts the vehicle's own battery management system. The battery management system uses an internal clock to count time during sleep period, automatically wakes up at a set time interval, starts counting after the vehicle is powered off, and resets the timing after the power is replenished and the vehicle enters sleep mode. Of course, it is understandable that the low-voltage battery temperature detection device can also be a separately set temperature detection device that is communicatively connected to the vehicle controller, which will not be elaborated here.

[0161] Embodiment 10:

[0162] like Figure 8 As shown, this implementation method provides an intelligent power replenishment system for new energy vehicles in a low temperature environment, including:

[0163] The high-voltage power replenishment unit is configured to: execute the intelligent power replenishment method for new energy vehicles in a low-temperature environment described in Example 1;

[0164] The low-voltage power supply unit is configured to: execute the intelligent power supply method for new energy vehicles in a low-temperature environment described in Example 4;

[0165] The dormant power replenishment unit is configured to: execute the intelligent power replenishment method for new energy vehicles in a low temperature environment as described in Example 7.

[0166] Embodiment 11:

[0167] like Fig. 9As shown, this implementation provides an electronic device, which includes a processor 1001, a communication interface 1002, and a computer-readable storage medium 1003. The processor 1001, the communication interface 1002, and the computer-readable storage medium 1003 may be connected via a bus or other means.

[0168] Among them, the communication interface 1002 is used to receive and send data, the computer-readable storage medium 1003 can be stored in the memory of the electronic device, the computer-readable storage medium 1003 is used to store a computer program, the computer program includes program instructions, and the processor 1001 is used to execute the program instructions stored in the computer-readable storage medium 1003.

[0169] Processor 1001 (or CPU (Central Processing Unit)) is the computing core and control core of the electronic device, which is suitable for implementing one or more instructions, specifically suitable for loading and executing one or more instructions to implement corresponding method processes or corresponding functions.

[0170] The processor 1001 is configured to execute the method described in Embodiment 1, Embodiment 4, or Embodiment 7.

[0171] Embodiment 12:

[0172] This implementation provides a computer-readable storage medium (Memory), which is a memory device in an electronic device for storing programs and data. It is understandable that the computer-readable storage medium here can include both built-in storage media in the electronic device and, of course, extended storage media supported by the electronic device. The computer-readable storage medium provides a storage space that stores the processing system of the electronic device.

[0173] In addition, the storage space also stores one or more instructions suitable for being loaded and executed by the processor, and these instructions may be one or more computer programs (including program codes). It should be noted that the computer-readable storage medium here may be a high-speed RAM memory, or a non-volatile memory, such as at least one disk memory; optionally, it may also be at least one computer-readable storage medium located away from the aforementioned processor.

[0174] In one embodiment, one or more instructions are stored in the computer-readable storage medium; the processor loads and executes the one or more instructions stored in the computer-readable storage medium to implement the method described in Example 1, Example 4, or Example 7.

[0175] Embodiment 13:

[0176] This implementation provides a computer program product or a computer program, which includes a computer instruction stored in a computer-readable storage medium. A processor of an electronic device reads the computer instruction from the computer-readable storage medium, and the processor executes the computer instruction, so that the electronic device executes the method described in Embodiment 1, Embodiment 4, or Embodiment 7.

[0177] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A smart charging method for new energy vehicles in a low temperature environment, characterized in that: Applicable to high voltage power supply state, at this time all controllers of the vehicle are in awake state, including the following process: Obtain low-voltage battery temperature and low-voltage battery voltage; When the voltage of the low-voltage battery is less than the first voltage threshold and the temperature of the low-voltage battery is higher than the temperature threshold, the high voltage is applied to the vehicle to supplement the low-voltage battery; When the voltage of the low-voltage battery is less than the first voltage threshold and the temperature of the low-voltage battery is less than or equal to the temperature threshold, the low-voltage battery is heated. When the temperature of the low-voltage battery is greater than or equal to the temperature threshold, the heating is stopped, so that the high voltage is applied to the whole vehicle to supplement the low-voltage battery. When the low-voltage battery voltage is greater than or equal to the second voltage threshold, the high voltage is lowered, the charging circuit is disconnected, and the charging is completed.

2. An intelligent power replenishment system for new energy vehicles in low temperature environments, characterized in that: Applicable to high voltage power supply state, at this time all controllers of the vehicle are in awake state, including the following process: The data acquisition unit is configured to: acquire the low-voltage battery temperature and the low-voltage battery voltage; The first control unit is configured to: when the voltage of the low-voltage battery is less than the first voltage threshold and the temperature of the low-voltage battery is higher than the temperature threshold, enable the vehicle to be high voltage to supplement the low-voltage battery; The second control unit is configured to: when the voltage of the low-voltage battery is less than the first voltage threshold and the temperature of the low-voltage battery is less than or equal to the temperature threshold, heat the low-voltage battery, and when the temperature of the low-voltage battery is greater than or equal to the temperature threshold, stop heating, so that the whole vehicle is high voltage, and replenish the low-voltage battery; The third control unit is configured to: when the voltage of the low-voltage battery is greater than or equal to the second voltage threshold, lower the high voltage, disconnect the charging circuit, and complete the charging.

3. An intelligent power replenishment system for new energy vehicles in low temperature environments, characterized in that: include: DCDC, slow charging relay, low-voltage battery temperature detection device, low-voltage voltage detection module, low-voltage battery heating device and control unit, one end of the slow charging relay is connected to the DCDC, and the other end of the slow charging relay is used to connect to the low-voltage battery; The DCDC is connected to the high-voltage battery, the low-voltage battery temperature detection device is connected to the low-voltage battery to detect the temperature of the low-voltage battery, the low-voltage voltage detection module is connected to the low-voltage battery to detect the voltage of the low-voltage battery, the low-voltage battery heating device is used to heat the low-voltage battery, and the slow-charging relay, the low-voltage battery temperature detection device and the low-voltage voltage detection module are respectively connected to the control unit; The low-voltage battery temperature is detected by a low-voltage battery temperature detection device, and the low-voltage battery voltage is detected by a low-voltage voltage detection module; When the low-voltage battery voltage is less than the first voltage threshold and the low-voltage battery temperature is greater than the temperature threshold, the slow-charge relay is closed and the vehicle is high-voltage, and the DCDC replenishes the low-voltage battery; When the low-voltage battery voltage is lower than the first voltage threshold but the low-voltage battery temperature is less than or equal to the temperature threshold, the low-voltage battery heating device starts to heat the low-voltage battery. When the low-voltage battery temperature is greater than or equal to the temperature threshold, the heating stops, the slow charging relay closes, and the vehicle is high-voltage, and the DCDC replenishes the low-voltage battery. When it is detected that the low-voltage battery voltage is greater than or equal to the second voltage threshold, the DCDC stops working, the high voltage is lowered, the slow charging relay is disconnected, and the charging is completed.

4. The intelligent power replenishment system for new energy vehicles in low temperature environment as claimed in claim 3, characterized in that: The control unit is a vehicle controller; or, the control unit is a power replenishment controller that is communicatively connected to the vehicle controller.

5. A smart charging method for new energy vehicles in a low temperature environment, characterized in that: Applicable to low voltage power supply state, including the following processes: Obtain low-voltage battery temperature and low-voltage battery voltage; When the voltage of the low-voltage battery is less than the first voltage threshold and the temperature of the low-voltage battery is higher than the temperature threshold, the status of the DCDC, the high-voltage battery system and the whole vehicle is detected. If there is no fault in the DCDC, the high-voltage battery and the whole vehicle, the high voltage on the whole vehicle supplements the power of the low-voltage battery, wherein the DCDC is connected between the high-voltage battery and the low-voltage battery; When the voltage of the low-voltage battery is less than the first voltage threshold, and the temperature of the low-voltage battery is less than or equal to the temperature threshold, the low-voltage battery is heated. When the battery temperature is greater than or equal to the temperature threshold, the heating is stopped, and the status of the DCDC, high-voltage battery system and the whole vehicle is detected. If there is no fault in the DCDC, high-voltage battery and the whole vehicle, the high voltage on the whole vehicle supplements the low-voltage battery. When the low-voltage battery voltage is greater than or equal to the second voltage threshold, the DCDC stops working, lowers the high voltage, disconnects the charging circuit, and the charging is completed.

6. An intelligent power replenishment system for new energy vehicles in low temperature environments, characterized in that: Applicable to low voltage power supply status, including: The data acquisition unit is configured to: acquire the low-voltage battery temperature and the low-voltage battery voltage; The first power replenishment control unit is configured to: when the voltage of the low-voltage battery is less than the first voltage threshold and the temperature of the low-voltage battery is higher than the temperature threshold, perform status detection on the DCDC, the high-voltage battery system and the whole vehicle, and if the DCDC, the high-voltage battery and the whole vehicle are not faulty, the high voltage on the whole vehicle replenishes the power for the low-voltage battery, wherein the DCDC is connected between the high-voltage battery and the low-voltage battery; The second power replenishment control unit is configured to: when the voltage of the low-voltage battery is less than the first voltage threshold and the temperature of the low-voltage battery is less than or equal to the temperature threshold, heat the low-voltage battery, and when the battery temperature is greater than or equal to the temperature threshold, stop heating, and perform status detection on the DCDC, the high-voltage battery system and the whole vehicle. If the DCDC, the high-voltage battery and the whole vehicle are fault-free, the high voltage on the whole vehicle replenishes the low-voltage battery; The third power replenishment control unit is configured to: when the voltage of the low-voltage battery is greater than or equal to the second voltage threshold, lower the high voltage, disconnect the charging circuit, and complete the power replenishment.

7. An intelligent power replenishment system for new energy vehicles in low temperature environments, characterized in that: include: DCDC, slow charging relay, low-voltage battery temperature detection device, low-voltage voltage detection module, low-voltage battery temperature detection device and vehicle controller, one end of the slow charging relay is connected to the DCDC, and the other end of the slow charging relay is used to connect to the low-voltage battery; The DCDC is connected to the high-voltage battery, the low-voltage battery temperature detection device is connected to the low-voltage battery to detect the temperature of the low-voltage battery, the low-voltage voltage detection module is connected to the low-voltage battery to detect the voltage of the low-voltage battery, the slow-charging relay, the low-voltage battery temperature detection device and the low-voltage voltage detection module are respectively connected to the vehicle controller, and the low-voltage battery heating device is used to heat the low-voltage battery; The low-voltage battery temperature is detected by a low-voltage battery temperature detection device, and the low-voltage battery voltage is detected by a low-voltage voltage detection module; When the low-voltage battery voltage is less than the first voltage threshold and the low-voltage battery temperature is greater than the temperature threshold, the vehicle controller performs status detection on the DCDC, high-voltage battery system and the vehicle. If there is no fault in the DCDC, high-voltage battery and the vehicle, the high-voltage and slow-charging relays on the vehicle are closed, and the DCDC replenishes the low-voltage battery. When the low-voltage battery voltage is less than the first voltage threshold but the low-voltage battery temperature is less than or equal to the temperature threshold, the low-voltage battery heating device starts to heat the low-voltage battery. When the low-voltage battery temperature is greater than or equal to the temperature threshold, the heating is stopped. The vehicle controller performs status detection on the DCDC, high-voltage battery system, and the vehicle. If there is no fault in the DCDC, high-voltage battery, and the vehicle, the high-voltage and slow-charging relays on the vehicle are closed, and the DCDC replenishes the low-voltage battery. When it is detected that the low-voltage battery voltage is greater than or equal to the second voltage threshold, the DCDC stops working, the high voltage is lowered, the slow charging relay is disconnected, and the charging is completed.

8. A smart charging method for new energy vehicles in a low temperature environment, characterized in that: Applied to the dormant state, including the following processes: The low-voltage battery temperature detection device is awakened at a fixed time to detect the low-voltage battery voltage. When the low-voltage battery voltage is less than or equal to a third voltage threshold, the VCU is awakened and the low-voltage battery temperature is obtained at the same time. When the low-voltage battery temperature is less than the temperature threshold, the low-voltage battery is heated. When the battery temperature is greater than or equal to the temperature threshold, the heating is stopped, and the status of the DCDC, high-voltage battery system and the vehicle is checked. If there is no fault in the DCDC, high-voltage battery and the vehicle, the high voltage on the vehicle supplements the low-voltage battery. The DCDC is connected between the high-voltage battery and the low-voltage battery. If the temperature of the low-voltage battery is greater than the temperature threshold, the status of the DCDC, high-voltage battery system, and the entire vehicle is checked. If there is no fault in the DCDC, high-voltage battery, and the entire vehicle, the high voltage on the entire vehicle will supplement the low-voltage battery. When the low-voltage battery voltage is greater than or equal to the second voltage threshold, the high voltage is lowered, the charging circuit is disconnected, and the charging is completed.

9. An intelligent power replenishment system for new energy vehicles in low temperature environments, characterized in that: Applies to the dormant state, including: The low-voltage battery heating unit is configured to: regularly wake up the low-voltage battery temperature detection device to detect the low-voltage battery voltage, wake up the VCU when the low-voltage battery voltage is less than or equal to a third voltage threshold, and simultaneously obtain the low-voltage battery temperature, and heat the low-voltage battery when the low-voltage battery temperature is less than the temperature threshold; The first control unit is configured to: when the battery temperature is greater than or equal to the temperature threshold, stop heating, perform status detection on the DCDC, the high-voltage battery system and the whole vehicle, and if the DCDC, the high-voltage battery and the whole vehicle are not faulty, the high voltage on the whole vehicle supplements the low-voltage battery; The second control unit is configured to: if the temperature of the low-voltage battery is greater than the temperature threshold, perform status detection on the DCDC, the high-voltage battery system, and the entire vehicle; if the DCDC, the high-voltage battery, and the entire vehicle are not faulty, the high voltage on the entire vehicle supplements the low-voltage battery; The third control unit is configured to: when the voltage of the low-voltage battery is greater than or equal to the second voltage threshold, lower the high voltage, disconnect the charging circuit, and complete the charging.

10. An intelligent power replenishment system for new energy vehicles in low temperature environments, characterized in that: Applies to the dormant state, including: DCDC, slow charging relay, low-voltage battery temperature detection device, low-voltage voltage detection module, low-voltage battery temperature detection device and vehicle controller, one end of the slow charging relay is connected to the DCDC, and the other end of the slow charging relay is used to connect to the low-voltage battery; The DCDC is connected to the high-voltage battery, the low-voltage battery temperature detection device is connected to the low-voltage battery to detect the temperature of the low-voltage battery, the low-voltage voltage detection module is connected to the low-voltage battery to detect the voltage of the low-voltage battery, the slow-charging relay, the low-voltage battery temperature detection device and the low-voltage voltage detection module are respectively connected to the vehicle controller, and the low-voltage battery heating device is used to heat the low-voltage battery; When it is detected that the low-voltage battery voltage is less than or equal to the third voltage threshold, the vehicle controller is awakened and the low-voltage battery temperature is detected at the same time. When it is detected that the low-voltage battery temperature is less than the temperature threshold, the low-voltage battery heating device is started to heat the low-voltage battery. When the battery temperature is greater than or equal to the temperature threshold, the heating is stopped. The vehicle controller performs status detection on the DCDC, high-voltage battery system and the vehicle. If there is no fault in the DCDC, high-voltage battery and the vehicle, the high-voltage and slow-charging relays on the vehicle are closed, and the DCDC replenishes the low-voltage battery. If it is detected that the temperature of the low-voltage battery is greater than the temperature threshold, the vehicle will perform status detection on the DCDC, high-voltage battery system, and the vehicle. If there is no fault in the DCDC, high-voltage battery, and the vehicle, the high-voltage and slow-charging relays on the vehicle will be closed, and the DCDC will replenish the low-voltage battery. When it is detected that the low-voltage battery voltage is greater than or equal to the second voltage threshold, the DCDC stops working, the high voltage is lowered, the slow charging relay is disconnected, the charging is completed, and the relevant controller re-enters sleep.

11. The intelligent power replenishment system for new energy vehicles in low temperature environment as claimed in claim 10, characterized in that: The low-voltage battery temperature detection device adopts the vehicle's own battery management system. The battery management system uses the internal clock to time during the dormant period, automatically wakes up at a set time interval, starts timing after the vehicle is powered off, and resets the timing after the power is replenished and the vehicle enters dormancy.

12. An intelligent power replenishment system for new energy vehicles in low temperature environments, characterized in that: include: The high-voltage power replenishment unit is configured to: execute the intelligent power replenishment method for new energy vehicles in a low-temperature environment as described in claim 1; The low-voltage power replenishment unit is configured to: execute the intelligent power replenishment method for new energy vehicles in a low-temperature environment as described in claim 5; The dormant power replenishment unit is configured to: execute the intelligent power replenishment method for new energy vehicles in a low temperature environment as described in claim 8.

13. A computer device, characterized in that: include: A processor and a computer readable storage medium; a processor adapted to execute a computer program; A computer-readable storage medium, wherein a computer program is stored in the computer-readable storage medium, and when the computer program is executed by the processor, the intelligent power replenishment method for new energy vehicles in a low temperature environment as described in claim 1, 5 or 8 is implemented.

14. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and the computer program is suitable for being loaded by a processor and executing the intelligent power replenishment method for new energy vehicles in a low temperature environment as described in claim 1, 5 or 8.

15. A computer program product, characterized in that The computer program product includes a computer program, and when the computer program is executed by a processor, the method for intelligent power replenishment of new energy vehicles in a low temperature environment as described in claim 1, 5 or 8 is implemented.

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