Electric vehicle low-voltage storage battery charging system and control method

Abstract

The invention discloses a charging system for a low-voltage storage battery of an electric vehicle and a control method. The electric vehicle low-voltage storage battery charging system comprises a low-voltage storage battery, a vehicle-mounted charger, a DCDC converter, a power battery system, a whole vehicle controller, a vehicle-mounted terminal, a user side APP and an electric vehicle monitoring platform. The vehicle-mounted terminal is used for acquiring the electricity supplementing demand of the low-voltage storage battery, and the electricity supplementing demand comprises a first-stage electricity supplementing demand, a second-stage electricity supplementing demand and a third-stage electricity supplementing demand; and if the low-voltage storage battery meets the three-level electricity supplementing requirement, the vehicle control unit controls the power battery system to power on the DCDC converter, charges the low-voltage storage battery according to second preset time and sends an alarm to the electric vehicle monitoring platform and the user side APP. According to the invention, the electricity supplement demand of the low-voltage storage battery is divided into three levels and electricity supplement management is carried out by fully utilizing the Internet of Vehicles, and through vehicle monitoring data, the after-sales platform carries out preventive maintenance and provides professional maintenance service conveniently after sales.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of electric vehicles, and in particular to a low-voltage battery charging system and a control method for an electric vehicle. Background Art

[0002] The power supply of electric vehicles consists of high-voltage batteries and low-voltage batteries. The high-voltage batteries are used to power the drive motors, air conditioners, etc., and the low-voltage batteries are used to power various intelligent control units. When the vehicle is started, the internal combustion engine drives the generator to generate electricity to charge the low-voltage battery. When the vehicle key is in the power-on mode, the high-voltage battery charges the low-voltage battery through DCDC; when the vehicle is connected to the charging pile, the charging pile charges the low-voltage battery. With the development of electric vehicles, the number of intelligent control units has increased rapidly. Compared with traditional fuel vehicles, the static current is larger. If the vehicle is parked for a long time, the low-voltage battery is more likely to run out of power. If there is no automatic power replenishment design, users can easily find that the vehicle cannot be powered on after parking for a period of time, causing trouble.

[0003] There are existing methods for automatic recharging of low-voltage batteries, including a timing method, such as patent application 202110291486.9, which discloses that after a fixed period of time after the vehicle is turned off, the BMS and DCDC of the high-voltage battery are awakened by a timer, the recharging circuit is powered on, and the high-voltage battery recharges the low-voltage battery through DCDC; there is also a constant voltage method, such as patent application 202211218306.5, which discloses that after detecting that the voltage of the low-voltage battery is lower than the set value, the vehicle is in a state of being turned off, and the charging pile is not connected, and the SOC of the high-voltage battery is greater than a set value, that is, the BMS and DCDC of the high-voltage battery are awakened by the low-voltage battery voltage detection unit, the recharging circuit is powered on, and the high-voltage battery recharges the low-voltage battery through DCDC; patent application 202410713077.7 improves the recharging method based on the voltage of the low-voltage battery, and stipulates that the number of times of recharging in one flameout cannot exceed the specified value. Patent application 202310604423.3 also stipulates an upper limit on the number of failed recharging in one flameout. Patent application 202410442758.4 improves the low-voltage battery voltage detection to power detection. The above methods are all based on the off-grid state of a single vehicle, and fail to make full use of the Internet of Vehicles for power replenishment management, nor can the after-sales platform perform preventive maintenance through vehicle monitoring data. Summary of the invention

[0004] The present invention provides a low-voltage battery charging system and control method for electric vehicles, which fully utilizes the Internet of Vehicles to divide the low-voltage battery charging demand into three levels and perform charging management, thereby improving the charging technology level of the low-voltage battery. Through vehicle monitoring data, the after-sales platform performs preventive maintenance and facilitates after-sales to provide professional maintenance services.

[0005] According to one aspect of the present invention, a low-voltage battery charging system for electric vehicles is provided, which includes: a low-voltage battery, an on-board charger, a DCDC DC converter, a power battery system, a vehicle controller, an on-board terminal, a user-side APP, and an electric vehicle monitoring platform;

[0006] The low-voltage battery is connected to the on-board charger and the DCDC converter, the DCDC converter is connected to the on-board charger, the power battery system, the vehicle controller and the on-board terminal, the on-board terminal is connected to the electric vehicle monitoring platform and the user-end APP, and the user-end APP is connected to the electric vehicle monitoring platform;

[0007] The vehicle-mounted terminal is used to obtain the power replenishment demand of the low-voltage battery, and the power replenishment demand includes: first-level power replenishment demand, second-level power replenishment demand and third-level power replenishment demand;

[0008] If the low-voltage battery has the first-level power replenishment requirement, the vehicle controller controls the power battery system to power on the DCDC converter to charge the low-voltage battery to the cut-off voltage;

[0009] If the low-voltage battery has the secondary power replenishment requirement, the vehicle controller controls the power battery system to power on the DCDC converter and charge the low-voltage battery according to the first preset time;

[0010] If the low-voltage battery meets the third-level power replenishment requirement, the vehicle controller controls the power battery system to power on the DCDC converter, charges the low-voltage battery according to the second preset time, and sends an alarm to the electric vehicle monitoring platform and the user-side APP.

[0011] Optionally, the low-voltage battery is used to provide power for low-voltage electrical appliances, the on-board charger is used to dynamically adjust the charging current or voltage parameters, charge the power battery system, and provide a low-voltage charging current to the low-voltage battery, the power battery system is used to provide electrical energy for the normal operation of the electric vehicle, and the DCDC DC converter is used to draw power from the power battery system and charge the low-voltage battery after voltage conversion;

[0012] The vehicle-mounted terminal is used to collect the electric vehicle inspection data and upload it to the electric vehicle monitoring platform. The user-side APP is used to provide intelligent navigation, remote control, charging appointment and vehicle maintenance reminder functions. The electric vehicle monitoring platform is used to process the data uploaded by the vehicle-mounted terminal and provide professional maintenance services.

[0013] According to another aspect of the present invention, a control method for a low-voltage battery charging system for an electric vehicle is provided. The control method for a low-voltage battery charging system for an electric vehicle is applied to the low-voltage battery charging system for an electric vehicle described in the above aspect. The control method includes:

[0014] Obtaining the power replenishment demand of the low-voltage battery, the power replenishment demand including: first-level power replenishment demand, second-level power replenishment demand and third-level power replenishment demand;

[0015] If the low-voltage battery has the first-level power replenishment requirement, the vehicle controller controls the power battery system to power on the DCDC converter to charge the low-voltage battery to the cut-off voltage;

[0016] If the low-voltage battery has the secondary power replenishment requirement, the vehicle controller controls the power battery system to power on the DCDC converter and charge the low-voltage battery according to the first preset time;

[0017] If the low-voltage battery meets the third-level power replenishment requirement, the vehicle controller controls the power battery system to power on the DCDC converter, charges the low-voltage battery according to the second preset time, and sends an alarm to the electric vehicle monitoring platform and the user-side APP.

[0018] Optionally, before obtaining the power replenishment demand of the low-voltage battery, the method further includes:

[0019] determining a parking state of the electric vehicle;

[0020] If the state of charge of the power battery system is higher than a second preset value, the electric vehicle enters a sentinel mode;

[0021] If the state of charge of the power battery system is lower than the second preset value, the electric vehicle exits the sentinel mode and enters the watchdog mode.

[0022] Optionally, when the state of charge of the power battery system is lower than the second preset value, the electric vehicle exits the sentinel mode and enters the watchdog mode, further comprising:

[0023] When the state of charge of the power battery system is lower than a third preset value, the on-board terminal sends a power shortage alarm of the power battery system to the electric vehicle monitoring platform and no longer actively replenishes power for the low-voltage battery.

[0024] Optionally, obtaining the power replenishment demand of the low-voltage battery includes:

[0025] The vehicle terminal detects the voltage of the low-voltage battery, and divides the power replenishment demand of the low-voltage battery into primary power replenishment demand, secondary power replenishment demand and tertiary power replenishment demand according to a first voltage threshold, a second voltage threshold and a third voltage threshold.

[0026] Optionally, if the low-voltage battery is the first-level power replenishment requirement, the vehicle controller controls the power battery system to power on the DCDC converter, and after charging the low-voltage battery to the cut-off voltage, it also includes:

[0027] When the state of charge of the power battery system is lower than a first preset value, or the power battery system is powered on abnormally, or the DCDC converter operates abnormally, the vehicle-mounted terminal sends a first alarm message to the electric vehicle monitoring platform and the user-side APP, and stops charging.

[0028] Optionally, if the low-voltage battery has the secondary power replenishment requirement, the vehicle controller controls the power battery system to power on the DCDC converter, and after charging the low-voltage battery according to the first preset time, the method further includes:

[0029] The state of charge of the power battery system is lower than a second preset value, the electric vehicle exits the sentinel mode, a charging failure occurs in the low-voltage battery, and the on-board terminal sends a second alarm message to the electric vehicle monitoring platform and the user-side APP.

[0030] According to another aspect of the present invention, there is also provided an electronic device, the electronic device comprising:

[0031] one or more processors;

[0032] A memory for storing one or more programs;

[0033] When the one or more programs are executed by the one or more processors, the one or more processors implement the method described in any embodiment of the present invention.

[0034] According to another aspect of the present invention, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the method described in any embodiment of the present invention is implemented.

[0035] The technical solution of the embodiment of the present invention provides a comprehensive charging method for low-voltage batteries of electric vehicles, which divides the charging demand of low-voltage batteries into three levels, so as to less disturb users and obtain professional support from the after-sales team, make full use of the original configuration of electric vehicles, do not increase hardware costs, improve the charging technology level of low-voltage batteries, avoid the impact of low-voltage battery power shortage on users' use of vehicles, improve the intelligent level of battery management, and facilitate after-sales to provide professional maintenance services. The vehicle-mounted terminal monitors vehicle data and performs charging management through the Internet of Vehicles. Except for the first-level charging demand for slight power shortage, the second-level charging demand and the third-level charging demand all implement the strategy of manual and intelligent interaction, and the electric vehicle after-sales platform performs preventive maintenance to avoid the hidden dangers of missing safety and serious faults in after-sales monitoring. In summary, the present invention solves the problem that the existing technologies are all solutions based on the off-grid state of a single vehicle, fail to make full use of the Internet of Vehicles to perform charging management, and cannot perform preventive maintenance by the after-sales platform through vehicle monitoring data.

[0036] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0038] Figure 1 It is a structural schematic diagram of a low-voltage battery charging system for an electric vehicle provided according to an embodiment of the present invention;

[0039] Figure 2 This is a flow chart of a control method of a low-voltage battery charging system for an electric vehicle provided according to an embodiment of the present invention;

[0040] Figure 3 This is a flow chart of a low-voltage battery charging method provided according to an embodiment of the present invention;

[0041] Figure 4 It is a structural schematic diagram of an electronic device provided according to an embodiment of the present invention. DETAILED DESCRIPTION

[0042] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0043] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0044] Figure 1 is a structural schematic diagram of a low-voltage battery charging system for an electric vehicle provided according to an embodiment of the present invention, with reference to Figure 1 The embodiment of the present invention provides a low-voltage battery charging system for electric vehicles, which includes: a low-voltage battery 1, an on-board charger 2, a DCDC converter 3, a power battery system 4, a vehicle controller 5, an on-board terminal 6, a user-side APP 7, and an electric vehicle monitoring platform 8;

[0045] The low-voltage battery 1 is connected to the on-board charger 2 and the DCDC converter 3, the DCDC converter 3 is connected to the on-board charger 2, the power battery system 4, the vehicle controller 5 and the on-board terminal 6, the on-board terminal 6 is connected to the electric vehicle monitoring platform 8 and the user-end APP7, and the user-end APP7 is connected to the electric vehicle monitoring platform 8;

[0046] The vehicle terminal 6 is used to obtain the power replenishment demand of the low-voltage battery 1, and the power replenishment demand includes: first-level power replenishment demand, second-level power replenishment demand and third-level power replenishment demand;

[0047] If the low-voltage battery 1 has a primary power replenishment requirement, the vehicle controller 5 controls the power battery system 4 to power on the DCDC converter 3 to charge the low-voltage battery 1 to the cut-off voltage;

[0048] If the low-voltage battery 1 has a secondary power replenishment requirement, the vehicle controller 5 controls the power battery system 4 to power on the DCDC converter 3 and charge the low-voltage battery 1 according to the first preset time;

[0049] If the low-voltage battery 1 has a third-level power replenishment requirement, the vehicle controller 5 controls the power battery system 4 to power on the DCDC converter 3, charges the low-voltage battery 1 according to the second preset time, and sends an alarm to the electric vehicle monitoring platform 8 and the user-side APP 7.

[0050] Specifically, the vehicle is parked with the handbrake pulled, the ignition switch is in the OFF position when the vehicle is powered off, the hood and doors are closed, and the vehicle enters the sentinel mode. In sentinel mode, the external environment of the vehicle is monitored, and routine inspections of the vehicle status are performed. The data is uploaded to the electric vehicle monitoring platform 8 for storage through the vehicle terminal 6 (Tbox is a standard product for electric vehicles, and its main function is to collect various relevant signal data of the vehicle). After the state of charge (SOC) of the power battery system 4 is lower than the specified value by 25%, the vehicle exits the sentinel mode and enters the watchdog mode. The vehicle terminal 6 collects the vehicle sleep inspection data and uploads it to the electric vehicle monitoring platform 8. Make full use of the intelligence of the sentinel mode.

[0051] Since the external charging power supply is not connected in the parking state, the on-board charger 2 is not activated, the DCDC converter 3 and the battery management system (BMS) in the power battery system 4 are in a power-off dormant state, the vehicle controller 5 is in a low-power sentinel operation mode, and the on-board terminal 6 is used to inspect the low-voltage battery 1.

[0052] The power replenishment demand of the low-voltage battery 1 is divided into three levels. The first level power replenishment demand is a slight power shortage, and the voltage threshold can be 12V; the second level power replenishment demand is a severe power shortage, and the voltage threshold can be 10.5V; the third level power replenishment demand is a power off alarm, and the voltage threshold can be 9.5V.

[0053] For the first-level power replenishment demand, the vehicle controller 5 performs power replenishment. The vehicle controller 5 wakes up the BMS in the power battery system 4, powers on the high voltage of the DCDC converter 3, and then wakes up the DCDC converter 3 to start current conversion and charge the low-voltage battery 1. The power replenishment cut-off voltage is 13.6V.

[0054] For the secondary charging demand, the vehicle controller 5 wakes up the BMS in the power battery system 4, powers up the high voltage of the DCDC converter 3, wakes up the DCDC converter 3 for current conversion, and charges the low-voltage battery 1. The level 2 charging time can be 1 hour.

[0055] For the third-level power replenishment demand, the vehicle controller 5 wakes up the BMS in the power battery system 4, powers on the high voltage of the DCDC converter 3, wakes up the DCDC converter 3 for current conversion, and replenishes the low-voltage battery 1 for 30 minutes. At the same time, an alarm is sent to the electric vehicle monitoring platform 8 and the user-side APP7. The electric vehicle after-sales service will perform vehicle diagnosis and formulate a treatment plan. After consultation with the user through the user-side APP7, remote control maintenance is carried out to avoid the hidden dangers of safety and serious faults missed by after-sales monitoring.

[0056] The technical solution of the embodiment of the present invention provides a comprehensive charging method for low-voltage batteries of electric vehicles, which divides the charging demand of low-voltage batteries into three levels, so as to less disturb users and obtain professional support from the after-sales team, make full use of the original configuration of electric vehicles, do not increase hardware costs, improve the charging technology level of low-voltage batteries, avoid the impact of low-voltage battery power shortage on users' use of vehicles, improve the intelligent level of battery management, and facilitate after-sales to provide professional maintenance services. The vehicle-mounted terminal monitors vehicle data and performs charging management through the Internet of Vehicles. Except for the first-level charging demand for slight power shortage, the second-level charging demand and the third-level charging demand all implement the strategy of manual and intelligent interaction, and the electric vehicle after-sales platform performs preventive maintenance to avoid the hidden dangers of missing safety and serious faults in after-sales monitoring. In summary, the present invention solves the problem that the existing technologies are all solutions based on the off-grid state of a single vehicle, fail to make full use of the Internet of Vehicles to perform charging management, and cannot perform preventive maintenance by the after-sales platform through vehicle monitoring data.

[0057] Continue to refer Figure 1 Optionally, the low-voltage battery 1 is used to provide power for low-voltage electrical appliances, the on-board charger 3 is used to dynamically adjust the charging current or voltage parameters, charge the power battery system 4, and provide a low-voltage charging current to the low-voltage battery 1, the power battery system 4 is used to provide electrical energy for the normal operation of the electric vehicle, and the DCDC DC converter 3 is used to draw power from the power battery system 4 and charge the low-voltage battery 1 after voltage conversion;

[0058] The vehicle terminal 6 is used to collect electric vehicle inspection data and upload it to the electric vehicle monitoring platform 8. The user-side APP 7 is used to provide intelligent navigation, remote control, charging reservation and vehicle maintenance reminder functions. The electric vehicle monitoring platform 8 is used to process the data uploaded by the vehicle terminal 6 and provide professional maintenance services.

[0059] Specifically, the low-voltage battery 1 is usually a 12V lead-acid battery or a 24V lead-acid battery, which supplies power to low-voltage electrical appliances such as lighting and instruments, as well as electronic control systems. The on-board charger 2 refers to a charger fixedly installed on the electric vehicle, which can perform CAN communication. According to the data provided by the BMS in the power battery system 4, it can dynamically adjust the charging current or voltage parameters, perform corresponding actions, complete the power battery charging process, and provide low-voltage charging current to the low-voltage battery 1. The power battery system 4 is the main energy storage device of the electric vehicle, providing electric energy for normal operation such as electric vehicle driving. The function of the DCDC DC converter 3 is to draw power from the power battery system 4, convert it into a low-voltage power supply, and charge the low-voltage battery 1.

[0060] The vehicle control unit (VCU) is equivalent to the brain of the electric vehicle and is the core control unit of the electric vehicle or hybrid vehicle. It is responsible for coordinating and managing the work of various subsystems of the vehicle to ensure efficient and safe operation of the entire vehicle.

[0061] As an important part of the Internet of Vehicles system, the vehicle terminal 6 has the core responsibility of being closely connected to the host through the CAN bus inside the vehicle, being able to capture key information such as vehicle status and button status in real time, communicating with the background system and user-side APP7, receiving control instructions from the user-side APP7 or the background system, and realizing remote display and control of vehicle information.

[0062] The functions of the user-side APP7 include intelligent navigation to help car owners find their destinations; remote control functions such as remote air conditioning start and car lock; a scheduled charging function to facilitate users to charge during low electricity consumption periods and save electricity bills; in addition, the user-side APP7 also provides vehicle maintenance reminders to ensure that the vehicle is maintained in a timely manner; some also include owner experience exchanges, etc.

[0063] The electric vehicle monitoring platform 8 is aimed at new energy vehicle manufacturers, covering various departments of new energy vehicle companies: announcement planning department, vehicle production department, quality assurance department, automobile research and development department, vehicle sales department, maintenance service department, etc., and provides the data uploaded by the vehicle to the corresponding departments for processing.

[0064] An embodiment of the present invention further provides a control method for a low-voltage battery charging system for an electric vehicle. The control method for a low-voltage battery charging system for an electric vehicle is applied to a low-voltage battery charging system for an electric vehicle in any embodiment of the present invention. The control method includes:

[0065] S110, obtaining a power replenishment demand of a low-voltage battery, where the power replenishment demand includes: a primary power replenishment demand, a secondary power replenishment demand, and a tertiary power replenishment demand;

[0066] Specific, combined Figure 1 The power replenishment demand of the low-voltage battery 1 is divided into three levels. The first level power replenishment demand is a slight power shortage, and the voltage threshold can be 12V; the second level power replenishment demand is a serious power shortage, and the voltage threshold can be 10.5V; the third level power replenishment demand is a power failure alarm, and the voltage threshold can be 9.5V.

[0067] S120: If the low-voltage battery has a first-level power replenishment requirement, the vehicle controller controls the power battery system to power on the DCDC converter to charge the low-voltage battery to the cut-off voltage;

[0068] Specific, combined Figure 1 For the first-level power replenishment demand, the vehicle controller 5 performs power replenishment. The vehicle controller 5 wakes up the BMS in the power battery system 4, powers on the high voltage of the DCDC converter 3, and then wakes up the DCDC converter 3 to start the current conversion and charge the low-voltage battery 1. The power replenishment cut-off voltage is 13.6V.

[0069] S130: If the low-voltage battery has a secondary power replenishment requirement, the vehicle controller controls the power battery system to power on the DCDC converter and charge the low-voltage battery according to a first preset time;

[0070] Specific, combined Figure 1 For the secondary charging demand, the vehicle controller 5 wakes up the BMS in the power battery system 4, powers up the DCDC converter 3 with high voltage, wakes up the DCDC converter 3 for current conversion, and charges the low-voltage battery 1. The secondary charging time can be 1 hour.

[0071] S140: If the low-voltage battery has a third-level power replenishment requirement, the vehicle controller controls the power battery system to power on the DCDC converter, charges the low-voltage battery according to the second preset time, and sends an alarm to the electric vehicle monitoring platform and the user-side APP.

[0072] Specific, combined Figure 1 For the third-level power replenishment demand, the vehicle controller 5 wakes up the BMS in the power battery system 4, powers on the high voltage of the DCDC converter 3, wakes up the DCDC converter 3 for current conversion, and replenishes the low-voltage battery 1 for 30 minutes. At the same time, an alarm is sent to the electric vehicle monitoring platform 8 and the user-side APP7. The electric vehicle after-sales service will diagnose the vehicle and formulate a treatment plan. After consultation with the user through the user-side APP7, remote control maintenance is carried out to avoid the hidden dangers of safety and serious faults missed by after-sales monitoring.

[0073] The control method of the low-voltage battery power compensation system of an electric vehicle provided in an embodiment of the present invention is used to control the low-voltage battery power compensation system of an electric vehicle provided in any embodiment of the present invention. Therefore, the control method of the low-voltage battery power compensation system of an electric vehicle provided in an embodiment of the present invention also has the beneficial effects described in the above embodiments, which will not be repeated here.

[0074] Optionally, before obtaining the power replenishment demand of the low-voltage battery, the following steps are also included:

[0075] Determine the parking status of the electric vehicle;

[0076] If the state of charge of the power battery system is higher than a second preset value, the electric vehicle enters a sentinel mode;

[0077] When the state of charge of the power battery system is lower than a second preset value, the electric vehicle exits the sentinel mode and enters the watchdog mode.

[0078] Specific, combined Figure 1 , the vehicle is parked with the handbrake pulled, the ignition switch is in the OFF position, the hood and doors are closed, and the vehicle enters the sentinel mode. In the sentinel mode, the external environment of the vehicle is monitored, and routine inspections of the vehicle status are performed. The data is uploaded to the electric vehicle monitoring platform 8 for storage through the vehicle terminal 6 (Tbox is a standard product for electric vehicles, and its main function is to collect various relevant signal data of the vehicle). After the state of charge (SOC) of the power battery system 4 is lower than the specified value of 25%, the vehicle exits the sentinel mode and enters the watchdog mode. The vehicle terminal 6 collects the vehicle sleep inspection data and uploads it to the electric vehicle monitoring platform 8.

[0079] Since the external charging power supply is not connected in the parking state, the on-board charger 2 is not activated, the DCDC converter 3 and the battery management system (BMS) in the power battery system 4 are in a power-off dormant state, the vehicle controller 5 is in a low-power sentinel operation mode, and the on-board terminal 6 is used to inspect the low-voltage battery 1.

[0080] Sentinel mode and watchdog mode have different monitoring ranges. Sentinel mode is led by the vehicle intelligent driving controller to monitor the environment and vehicle status; watchdog mode is led by the vehicle terminal 6, which only performs regular inspections on a few components of the vehicle and sends data to the electric vehicle monitoring platform 8. Within the inspection range of sentinel mode and watchdog mode, the low-voltage battery can trigger three levels of power replenishment requirements.

[0081] Optionally, when the state of charge of the power battery system is lower than a second preset value, the electric vehicle exits the sentinel mode, and after entering the watchdog mode, the method further includes:

[0082] When the state of charge of the power battery system is lower than the third preset value, the on-board terminal sends a power battery system power shortage alarm to the electric vehicle monitoring platform and no longer actively recharges the low-voltage battery.

[0083] Specific, combined Figure 1 After the vehicle exits the sentinel mode, the vehicle enters the watchdog mode, and the vehicle terminal 6 is responsible for the voltage detection and data transmission of the low-voltage battery, and the electric vehicle monitoring platform 8 receives and executes commands. When the SOC of the power battery system 4 is lower than 15%, the vehicle terminal 6 only sends a serious power shortage alarm of the power battery system 4 to the electric vehicle monitoring platform 8, and no longer actively recharges the low-voltage battery 1, and only executes the manual instructions of the after-sales team.

[0084] Optionally, obtaining the power replenishment demand of the low-voltage battery includes:

[0085] The vehicle terminal detects the voltage of the low-voltage battery, and divides the power replenishment demand of the low-voltage battery into: primary power replenishment demand, secondary power replenishment demand and tertiary power replenishment demand according to the first voltage threshold, the second voltage threshold and the third voltage threshold.

[0086] Specifically, the power replenishment demand of the low-voltage battery is divided into three levels. The first level power replenishment demand is slight power shortage, and the first voltage threshold can be 12V; the second level power replenishment demand is severe power shortage, and the second voltage threshold can be 10.5V; the third level power replenishment demand is power off alarm, and the third voltage threshold can be 9.5V.

[0087] Optionally, if the low-voltage battery has a primary power replenishment requirement, the vehicle controller controls the power battery system to power on the DCDC converter, and after charging the low-voltage battery to the cut-off voltage, the following steps are also included:

[0088] When the state of charge of the power battery system is lower than the first preset value, or the power battery system is powered on abnormally, or the DCDC converter is working abnormally, the on-board terminal sends a first alarm message to the electric vehicle monitoring platform and the user-side APP, and stops charging.

[0089] Specific, combined Figure 1 If the SOC of the power battery system 4 is lower than 30%, or the high voltage on the BMS is abnormal, or the DCDC converter 3 is abnormal, the vehicle terminal 6 sends a first alarm message and stops charging. The vehicle terminal 6 sends the first alarm message to the electric vehicle monitoring platform 8, and the strategy of the electric vehicle monitoring platform 8 determines the processing.

[0090] Optionally, if the low-voltage battery has a secondary power replenishment requirement, the vehicle controller controls the power battery system to power on the DCDC converter, and after charging the low-voltage battery according to the first preset time, the method further includes:

[0091] The state of charge of the power battery system is lower than the second preset value, the electric vehicle exits the sentinel mode, a charging failure occurs in the low-voltage battery, and the on-board terminal sends a second alarm message to the electric vehicle monitoring platform and the user-side APP.

[0092] Specific, combined Figure 1 If the SOC of the power battery system 4 is lower than 25%, the vehicle exits the sentinel mode, or a charging failure occurs, a second alarm message is sent to the user-side APP 7 and the electric vehicle monitoring platform 8, and the after-sales service and the user negotiate a solution. It should be noted that the second alarm message sends the detected fault code.

[0093] Figure 3 is a flowchart of a low-voltage battery charging method provided according to an embodiment of the present invention, with reference to Figure 3 , Figure 3 The charging strategy for low-voltage batteries is designed in sentinel mode, watchdog mode, and after-sales manual mode. In addition to the first-level charging for slight power loss, the second-level and third-level charging all implement the strategy of manual and intelligent interaction to avoid the hidden dangers of missing safety and serious faults in after-sales monitoring.

[0094] Figure 4 A schematic diagram of the structure of an electronic device 10 that can be used to implement an embodiment of the present invention is shown. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices (such as helmets, glasses, watches, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or required herein.

[0095] like Figure 4 As shown, the electronic device 10 includes at least one processor 11, and a memory connected to the at least one processor 11, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc., wherein the memory stores a computer program that can be executed by at least one processor, and the processor 11 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 12 or the computer program loaded from the storage unit 18 to the random access memory (RAM) 13. In the RAM 13, various programs and data required for the operation of the electronic device 10 can also be stored. The processor 11, the ROM 12, and the RAM 13 are connected to each other through a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0096] A number of components in the electronic device 10 are connected to the I / O interface 15, including: an input unit 16, such as a keyboard, a mouse, etc.; an output unit 17, such as various types of displays, speakers, etc.; a storage unit 18, such as a disk, an optical disk, etc.; and a communication unit 19, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks.

[0097] The processor 11 may be a variety of general and / or special processing components with processing and computing capabilities. Some examples of the processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various dedicated artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The processor 11 executes the various methods and processes described above, for example, a control method for a low-voltage battery charging system for an electric vehicle.

[0098] In some embodiments, the control method of the low-voltage battery charging system of an electric vehicle can be implemented as a computer program, which is tangibly contained in a computer-readable storage medium, such as a storage unit 18. In some embodiments, part or all of the computer program can be loaded and / or installed on the electronic device 10 via the ROM 12 and / or the communication unit 19. When the computer program is loaded into the RAM 13 and executed by the processor 11, one or more steps of the control method of the low-voltage battery charging system of the electric vehicle described above can be executed. Alternatively, in other embodiments, the processor 11 can be configured to execute the control method of the low-voltage battery charging system of the electric vehicle by any other appropriate means (for example, by means of firmware).

[0099] Various implementations of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chips (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various implementations can include: being implemented in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0100] Computer programs for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that when the computer program is executed by the processor, the functions / operations specified in the flow chart and / or block diagram are implemented. The computer program may be executed entirely on the machine, partially on the machine, partially on the machine and partially on a remote machine as a stand-alone software package, or entirely on a remote machine or server.

[0101] In the context of the present invention, a computer-readable storage medium may be a tangible medium that may contain or store a computer program for use by or in combination with an instruction execution system, device or equipment. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. A more specific example of a machine-readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0102] To provide interaction with a user, the systems and techniques described herein may be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and a pointing device (e.g., a mouse or trackball) through which the user can provide input to the electronic device. Other types of devices may also be used to provide interaction with the user; for example, the feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form (including acoustic input, voice input, or tactile input).

[0103] The systems and techniques described herein may be implemented in a computing system that includes backend components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes frontend components (e.g., a user computer with a graphical user interface or a web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such backend components, middleware components, or frontend components. The components of the system may be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0104] A computing system may include a client and a server. The client and the server are generally remote from each other and usually interact through a communication network. The client and server relationship is generated by computer programs running on the corresponding computers and having a client-server relationship with each other. The server may be a cloud server, also known as a cloud computing server or cloud host, which is a host product in the cloud computing service system to solve the defects of difficult management and weak business scalability in traditional physical hosts and VPS services.

[0105] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0106] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A low-voltage battery charging system for electric vehicles, characterized in that: include: Low-voltage batteries, on-board chargers, DCDC converters, power battery systems, vehicle controllers, on-board terminals, user-side APPs, and electric vehicle monitoring platforms; The low-voltage battery is connected to the on-board charger and the DCDC converter, the DCDC converter is connected to the on-board charger, the power battery system, the vehicle controller and the on-board terminal, the on-board terminal is connected to the electric vehicle monitoring platform and the user-end APP, and the user-end APP is connected to the electric vehicle monitoring platform; The vehicle-mounted terminal is used to obtain the power replenishment demand of the low-voltage battery, and the power replenishment demand includes: first-level power replenishment demand, second-level power replenishment demand and third-level power replenishment demand; If the low-voltage battery has the first-level power replenishment requirement, the vehicle controller controls the power battery system to power on the DCDC converter to charge the low-voltage battery to the cut-off voltage; If the low-voltage battery has the secondary power replenishment requirement, the vehicle controller controls the power battery system to power on the DCDC converter and charge the low-voltage battery according to the first preset time; If the low-voltage battery meets the third-level power replenishment requirement, the vehicle controller controls the power battery system to power on the DCDC converter, charges the low-voltage battery according to the second preset time, and sends an alarm to the electric vehicle monitoring platform and the user-side APP.

2. The system according to claim 1, characterized in that The low-voltage battery is used to provide power for low-voltage electrical appliances, the on-board charger is used to dynamically adjust the charging current or voltage parameters, charge the power battery system, and provide a low-voltage charging current to the low-voltage battery, the power battery system is used to provide electrical energy for the normal operation of the electric vehicle, and the DCDC DC converter is used to draw power from the power battery system and charge the low-voltage battery after voltage conversion; The vehicle-mounted terminal is used to collect the electric vehicle inspection data and upload it to the electric vehicle monitoring platform. The user-side APP is used to provide intelligent navigation, remote control, charging reservation and vehicle maintenance reminder functions. The electric vehicle monitoring platform is used to process the data uploaded by the vehicle-mounted terminal and provide professional maintenance services.

3. A control method for a low-voltage battery charging system of an electric vehicle, characterized in that: Applied to the low-voltage battery charging system for electric vehicles according to any one of claims 1 to 2, the control method comprises: Obtaining the power replenishment demand of the low-voltage battery, the power replenishment demand including: first-level power replenishment demand, second-level power replenishment demand and third-level power replenishment demand; If the low-voltage battery has the first-level power replenishment requirement, the vehicle controller controls the power battery system to power on the DCDC converter to charge the low-voltage battery to the cut-off voltage; If the low-voltage battery has the secondary power replenishment requirement, the vehicle controller controls the power battery system to power on the DCDC converter and charge the low-voltage battery according to the first preset time; If the low-voltage battery meets the third-level power replenishment requirement, the vehicle controller controls the power battery system to power on the DCDC converter, charges the low-voltage battery according to the second preset time, and sends an alarm to the electric vehicle monitoring platform and the user-side APP.

4. The method according to claim 3, characterized in that Before obtaining the power replenishment demand of the low-voltage battery, the method further includes: determining a parking state of the electric vehicle; If the state of charge of the power battery system is higher than a second preset value, the electric vehicle enters a sentinel mode; If the state of charge of the power battery system is lower than the second preset value, the electric vehicle exits the sentinel mode and enters the watchdog mode.

5. The method according to claim 4, characterized in that If the state of charge of the power battery system is lower than the second preset value, the electric vehicle exits the sentinel mode, and after entering the watchdog mode, the following further comprises: When the state of charge of the power battery system is lower than a third preset value, the on-board terminal sends a power shortage alarm of the power battery system to the electric vehicle monitoring platform and no longer actively replenishes power for the low-voltage battery.

6. The method according to claim 3, characterized in that The obtaining of the power replenishment demand of the low-voltage battery includes: The vehicle terminal detects the voltage of the low-voltage battery, and divides the power replenishment demand of the low-voltage battery into primary power replenishment demand, secondary power replenishment demand and tertiary power replenishment demand according to a first voltage threshold, a second voltage threshold and a third voltage threshold.

7. The method according to claim 3, characterized in that If the low-voltage battery is the first-level power replenishment requirement, the vehicle controller controls the power battery system to power on the DCDC converter, and after charging the low-voltage battery to the cut-off voltage, the method further includes: When the state of charge of the power battery system is lower than a first preset value, or the power battery system is powered on abnormally, or the DCDC converter operates abnormally, the vehicle-mounted terminal sends a first alarm message to the electric vehicle monitoring platform and the user-side APP, and stops charging.

8. The method according to claim 3, characterized in that If the low-voltage battery has the secondary power replenishment requirement, the vehicle controller controls the power battery system to power on the DCDC converter, and after charging the low-voltage battery according to the first preset time, the method further includes: The state of charge of the power battery system is lower than a second preset value, the electric vehicle exits the sentinel mode, a charging failure occurs in the low-voltage battery, and the on-board terminal sends a second alarm message to the electric vehicle monitoring platform and the user-side APP.

9. An electronic device, characterized in that: include: one or more processors; A memory for storing one or more programs; When the one or more programs are executed by the one or more processors, the one or more processors implement the method according to any one of claims 3 to 8.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 3 to 8 is implemented.

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