An Electric Vehicle Battery Anti-Theft Method and System

Abstract

The present invention relates to the field of anti-theft of power batteries for electric vehicles, and discloses an electric vehicle battery anti-theft method and system. The method includes a battery anti-theft module for connecting to a remote monitoring cloud platform. The battery anti-theft module obtains vehicle data and determines the operating status of the battery management system (BMS). When the BMS is in a charging state, if a high-voltage loop interlock fault signal or a BMS internal communication fault signal is detected in the vehicle, the vehicle is at risk of battery theft. When the BMS is in an automatic wake-up state, if the cloud times out without receiving a monitoring message or a BMS internal communication fault signal, the vehicle is at risk of battery theft. When the BMS is in an available state, if a high-voltage loop interlock fault signal or a BMS internal communication fault signal is detected in the vehicle, the vehicle is at risk of battery theft. Whether the high-voltage or low-voltage cable is disconnected, the battery can be monitored for theft, making the vehicle's anti-theft function more comprehensive.

Description

Technical Field

[0001] The present invention belongs to the field of anti-theft of power batteries of electric vehicles, and particularly relates to an anti-theft method and system for electric vehicle batteries. Background Art

[0002] The battery unit price of new energy vehicles is high, the batteries are expensive, and the anti-theft measures are relatively weak. Figure 1 As shown, the power batteries of electric light trucks of new energy vehicles are arranged on each side of the chassis, with the installation structure exposed to the outside, which poses a high risk of theft. There have been cases of theft, and business feedback has shown that some customers have anti-theft needs.

[0003] Existing battery boxes are basically fastened to the vehicle frame by bolts. The batteries of light trucks are completely exposed. The battery boxes of buses are protected by the luggage compartment door, and those of heavy trucks are protected by the battery box cover. The battery boxes of passenger cars are hidden under the chassis. They basically rely on mechanical anti-theft methods, which are not very intelligent and cannot effectively block, detect and recover.

[0004] For example, a Chinese invention patent application document with application publication number CN110943260A discloses a battery anti-theft method, an anti-theft battery, and a base station. When the cover-opening detection device in this solution detects that the battery box is opened, it sends a cover-opening signal to the control unit; when the control unit determines that the battery has been stolen, it controls the anti-theft battery cell to quickly self-destruct, so that the anti-theft battery cannot be used normally, so that the thief who steals the anti-theft battery will no longer steal the anti-theft battery because he cannot use the anti-theft battery normally, thereby realizing special anti-theft protection for the anti-theft battery. This method realizes anti-theft through detection and self-destruction functions, but when the power of the monitoring unit or the control unit is cut off, the anti-theft function cannot be realized.

[0005] The Chinese utility model patent application document with authorization announcement number CN206615292U discloses an anti-theft battery and electric vehicle that can achieve remote positioning. In this solution, the navigation circuit and positioning chip can accurately know the battery's route and current location information, and send the route and location to an external smart terminal. The owner of the battery can know the battery's location status in real time through the smart terminal. Once the battery position status deviates, the battery can be remotely controlled to self-lock, causing its power supply system to stop operating. This not only realizes the remote positioning function, but also can achieve anti-theft based on positioning. This method is suitable for recovering a lost battery box, but cannot be used when a thief steals.

[0006] The Chinese invention patent application document with application publication number CN109229058A discloses an intelligent anti-theft system for a power battery pack for an electric vehicle and an implementation method thereof. The scheme introduces an intelligent anti-theft system for a power battery pack for an electric vehicle and an implementation method thereof. It has the advantages of simple structure, simple monitoring process, and reduced energy consumption. However, when the thief first disconnects the low-voltage power, all anti-theft systems on the vehicle become ineffective and its application is limited. Summary of the Invention

[0007] The present invention provides an electric vehicle battery anti-theft method and system, which are used to solve the problem that the anti-theft system fails when the low voltage power is disconnected in the existing battery anti-theft system and the anti-theft system function is not comprehensive.

[0008] To solve the above technical problems, the technical solutions included in the present invention and the corresponding beneficial effects of the technical solutions are as follows:

[0009] The present invention provides a solution for an electric vehicle battery anti-theft method, which obtains vehicle data and determines the working status of the BMS; when the BMS is in a charging state, if a high-voltage loop interlock fault signal is detected in the vehicle, or a BMS internal communication fault signal is detected, the vehicle is at risk of battery theft; when the BMS is in an automatic wake-up state, if the cloud times out and fails to receive a monitoring message, or a BMS internal communication fault signal is detected, the vehicle is at risk of battery theft; when the BMS is in an available state, if a high-voltage loop interlock fault signal is detected in the vehicle, or a BMS internal communication fault signal is detected, the vehicle is at risk of battery theft.

[0010] The beneficial effects of the above technical solution are: based on vehicle data and the working status of the BMS, when a high-voltage loop interlock fault signal is detected in the vehicle, or a BMS internal communication fault signal is detected, or the cloud times out and fails to receive a monitoring message, it indicates that the vehicle's battery is at risk of being stolen; compared with the existing technology, it can monitor not only when the vehicle is in a charging state, but also when the vehicle is in a parked state; it can monitor not only when the high voltage is disconnected, but also when the low-voltage cable is disconnected; it can be seen that the vehicle anti-theft function is more comprehensive.

[0011] When the BMS is in automatic wake-up state, charging state, or available state, the BMS and monitoring host are in periodic working state, uploading the battery data to the battery anti-theft module of the remote monitoring platform. If the anti-theft module can regularly receive the signal sent by the BMS, no alarm will be issued; if there is no monitoring (the battery box life signal is lost) or the internal communication of the battery fails, an alarm will be issued, judging that the battery may be being stolen, and an alarm text message will be sent to the customer through the Internet of Vehicles platform for timely on-site inspection to reduce the customer's loss.

[0012] Furthermore, the vehicle data is obtained and all counters are incremented by 1; and the working status of the BMS is determined; when the BMS is in the charging state, if the high-voltage loop interlock fault signal of the vehicle is not detected, the high-voltage abnormal disconnection alarm counter is reset, and if the BMS internal communication fault signal is not detected, the battery monitoring loss alarm counter is reset; when the BMS is in the automatic wake-up state, if the cloud receives the monitoring message within the set time, the vehicle monitoring loss alarm counter is reset, and if the BMS internal communication fault signal is not detected, the battery monitoring loss alarm counter is reset; when the BMS is in the available state, if the high-voltage loop interlock fault signal of the vehicle is not detected, the high-voltage abnormal disconnection alarm counter is reset, and if the BMS internal communication fault signal is not detected, the battery monitoring loss alarm counter is reset; within the set time, if any alarm counter is not in the reset state, the battery theft alarm is triggered.

[0013] After obtaining vehicle data, all counters are incremented by 1. If no high-voltage loop interlock fault signal is detected in the vehicle, no BMS internal communication fault signal is detected, and the cloud receives the monitoring message within the set time, the corresponding counter will be reset. If any counter is not reset within the set time, it means that the vehicle battery is being stolen. By incrementing the counter by 1 first and then resetting it, misjudgment caused by poor line contact or unstable transmission signal can be avoided, making the judgment result more accurate.

[0014] Furthermore, the vehicle uploads vehicle data at regular intervals, obtains vehicle data within a set time and makes subsequent judgments.

[0015] Furthermore, if the vehicle is not in sentry mode, and the vehicle is in a parked state, the vehicle driver's door is locked, and the BMS has no loop interlock fault and internal communication fault, the sentry mode is enabled; in the sentry mode, vehicle data is obtained and all counters are increased by 1.

[0016] Furthermore, if the vehicle is in sentry mode and is not in parking state, the sentry mode is turned off.

[0017] Because the risk of battery theft is lower when the vehicle is in motion, turn off Sentry Mode when the vehicle is in motion.

[0018] The present invention also provides a solution for an electric vehicle battery anti-theft system, comprising a battery anti-theft module for connecting to a remote monitoring cloud platform, through which vehicle data is obtained and the working status of the BMS is judged; when the BMS is in a charging state, if a high-voltage loop interlock fault signal is detected in the vehicle, or a BMS internal communication fault signal is detected, the vehicle is at risk of battery theft; when the BMS is in an automatic wake-up state, if the cloud times out and fails to receive a monitoring message, or a BMS internal communication fault signal is detected, the vehicle is at risk of battery theft; when the BMS is in an available state, if a high-voltage loop interlock fault signal is detected in the vehicle, or a BMS internal communication fault signal is detected, the vehicle is at risk of battery theft.

[0019] The beneficial effects of the above technical solution are: based on vehicle data and the working status of the BMS, when a high-voltage loop interlock fault signal is detected in the vehicle, or a BMS internal communication fault signal is detected, or the cloud times out and fails to receive a monitoring message, it indicates that the vehicle's battery is at risk of being stolen; compared with the existing technology, it can monitor not only when the vehicle is in a charging state, but also when the vehicle is in a parked state; it can monitor not only when the high voltage is disconnected, but also when the low-voltage cable is disconnected; it can be seen that the vehicle anti-theft function is more comprehensive.

[0020] Furthermore, the vehicle data is obtained and all counters are incremented by 1; and the working status of the BMS is determined; when the BMS is in the charging state, if the high-voltage loop interlock fault signal of the vehicle is not detected, the high-voltage abnormal disconnection alarm counter is reset, and if the BMS internal communication fault signal is not detected, the battery monitoring loss alarm counter is reset; when the BMS is in the automatic wake-up state, if the cloud receives the monitoring message within the set time, the vehicle monitoring loss alarm counter is reset, and if the BMS internal communication fault signal is not detected, the battery monitoring loss alarm counter is reset; when the BMS is in the available state, if the high-voltage loop interlock fault signal of the vehicle is not detected, the high-voltage abnormal disconnection alarm counter is reset, and if the BMS internal communication fault signal is not detected, the battery monitoring loss alarm counter is reset; within the set time, if any alarm counter is not in the reset state, the battery theft alarm is triggered.

[0021] After obtaining vehicle data, all counters are incremented by 1. If no high-voltage loop interlock fault signal is detected in the vehicle, no BMS internal communication fault signal is detected, and the cloud receives the monitoring message within the set time, the corresponding counter will be reset. If any counter is not reset within the set time, it means that the vehicle battery is being stolen. By incrementing the counter by 1 first and then resetting it, misjudgment caused by poor line contact or unstable transmission signal can be avoided, making the judgment result more accurate.

[0022] Furthermore, the vehicle uploads vehicle data at regular intervals, obtains vehicle data within a set time and makes subsequent judgments.

[0023] Furthermore, if the vehicle is not in sentry mode, and the vehicle is in a parked state, the vehicle driver's door is locked, and the BMS has no loop interlock fault and internal communication fault, the sentry mode is enabled; in the sentry mode, vehicle data is obtained and all counters are increased by 1.

[0024] Furthermore, if the vehicle is in sentry mode and is not in parking state, the sentry mode is turned off.

[0025] Because the risk of battery theft is lower when the vehicle is in motion, turn off Sentry Mode when the vehicle is in motion. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of a light truck power battery exposed on the outside of a car;

[0027] Figure 2 This is the "Sentinel Mode" monitoring principle diagram of the present invention;

[0028] Figure 3 This is the cloud platform battery anti-theft module judgment logic - dog feeding thread flow chart in the present invention;

[0029] Figure 4 This is the judgment logic-alarm thread flow chart of the cloud platform battery anti-theft module in the present invention. DETAILED DESCRIPTION

[0030] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0031] Method Example:

[0032] The basic concept of this solution is to develop a battery remote monitoring and anti-theft function (referred to as "Sentinel Mode") based on the DCDC timer wake-up function of electric vehicle monitoring. When the vehicle is parked, the BMS and the monitoring host are in a periodic working state, uploading the battery data to the battery anti-theft module of the remote monitoring platform. If the anti-theft module can regularly receive the signal sent by the BMS, it will not alarm. If there is no monitoring (the battery box life signal is lost) or the internal communication of the battery fails, it is judged that the battery may be being stolen, and an alarm text message will be sent to the customer through the Internet of Vehicles platform for timely on-site inspection to reduce the customer's losses.

[0033] like Figure 2 As shown in the figure, the monitoring principle of sentry mode is:

[0034] Under normal circumstances, the on-board monitoring DCDC will wake itself up periodically to power the BMS, VCU, and ICard. The BMS collects battery status and sends it to the VCU via high-voltage CAN. The VCU forwards it to the ICard via low-voltage CAN. The ICard regularly feeds the cloud platform dog via the 4G communication module, and the cloud platform dog does not alarm.

[0035] Under abnormal circumstances, whether the high voltage is disconnected, causing the on-board monitoring DCDC to fail to wake up regularly, or the low voltage cable is disconnected, causing the BMS, VCU, and ICard to be unable to transmit battery data normally, it will cause the ICard to fail to feed the dog on the cloud platform regularly. The car cannot feed the dog on the cloud platform on time, and an alarm will be given to the owner if the specified time is exceeded.

[0036] Further analysis of the anti-theft scenario using the anti-theft method of the present invention reveals the identification characteristics and alarm content of the theft scenario, as shown in Table 1, when the battery management system lacks an internal communication fault code. The vehicle operates in three states: charging, parking, and driving. The BMS operates in four states: charging, automatic wakeup, available, and powered off. When the vehicle is charging, the BMS status flag indicates charging. When the vehicle is parked, the BMS status flag may indicate automatic wakeup or available. When the vehicle is driving, the likelihood of battery theft is low and is not analyzed.

[0037] Table 1 Analysis of vehicle remote monitoring anti-theft scenarios and countermeasures

[0038]

[0039] like Figure 3 As shown, the control logic of the cloud platform battery anti-theft module is:

[0040] Acquire vehicle data and determine the working status of the BMS; when the BMS is in the charging state, if a high-voltage loop interlock fault signal is detected in the vehicle, or a BMS internal communication fault signal is detected, the vehicle is at risk of battery theft; when the BMS is in the automatic wake-up state, if the cloud times out and does not receive the monitoring message, or a BMS internal communication fault signal is detected, the vehicle is at risk of battery theft; when the BMS is in the available state, if a high-voltage loop interlock fault signal is detected in the vehicle, or a BMS internal communication fault signal is detected, the vehicle is at risk of battery theft.

[0041] Obtain vehicle data and add 1 to all counters; and determine the working status of the BMS; when the BMS is in the charging state, if no high-voltage loop interlock fault signal is detected in the vehicle, the high-voltage abnormal disconnection alarm counter will be reset; if no BMS internal communication fault signal is detected, the battery monitoring loss alarm counter will be reset; when the BMS is in the automatic wake-up state, if the cloud receives the monitoring message within the set time, the vehicle monitoring loss alarm counter will be reset; if no BMS internal communication fault signal is detected, the battery monitoring loss alarm counter will be reset; when the BMS is in the available state, if no high-voltage loop interlock fault signal is detected in the vehicle, the high-voltage abnormal disconnection alarm counter will be reset; if no BMS internal communication fault signal is detected, the battery monitoring loss alarm counter will be reset; within the set time, if any alarm counter is not in the reset state, the battery theft alarm will be triggered.

[0042] Specifically, based on the battery safety contact table imported by the light truck Anyton system, the work number / VIN of all vehicles is periodically traversed. The data sent by the remote terminal of the vehicle within the current latest time T0 is read according to the work number / VIN, and it is determined whether the reading is successful. If the reading is successful, it is determined whether the vehicle is in sentry mode. If not, it is determined whether the conditions for entering sentry mode are met and whether to enter. If sentry mode has been entered, it is determined whether the current gear position of the vehicle is parking (P gear). If so, it is determined whether an alarm has been triggered. If no alarm has been triggered, the BMS power supply mode is determined based on the BMS status.

[0043] If it is in the automatic wake-up state, there are two situations during theft: 1. Disconnecting the MSD will lose the life signal; 2. Disconnecting the low-voltage harness will report a BMS internal communication failure;

[0044] If the battery is in charging or usable state, there are three situations in theft: 1. Disconnecting the MSD will cause a loop interlock alarm; 2. Disconnecting the low-voltage wiring harness will cause a BMS internal communication failure alarm; 3. Disconnecting the 24 power supply line will cause the battery to be transferred to the power-off state;

[0045] If there is no abnormality, the alarm counter corresponding to the vehicle is reset; if there is an abnormality, the alarm counter corresponding to the vehicle is not reset.

[0046] like Figure 4 The cloud platform battery anti-theft module alarm thread shown in the figure triggers an alarm when the alarm counter is not reset within the specified time (T2) and sends a maintenance reminder to the service station and the car owner.

[0047] The beneficial effects of the present invention are as follows:

[0048] 1. Apply the cloud platform's monitoring function to the battery anti-theft function and develop a sentinel mode. By feeding the dog regularly, the sentinel mode can trigger the battery system monitoring anomalies in time, which is in line with the development trend of intelligent electric vehicles.

[0049] 2. Through the vehicle-side scheduled wake-up, the cloud is regularly fed through the existing components BMS, VCU, and remote monitoring on the vehicle. Only the software needs to be changed without increasing material costs.

[0050] 3. A mechanism has been developed to trigger an alarm if the dog is not fed in time. When the low-voltage power of the entire vehicle is cut off, the alarm can also be triggered by monitoring the wake-up function of DCDC.

[0051] System Example:

[0052] The electric vehicle battery anti-theft system of the present invention includes a battery anti-theft module for connecting to a remote monitoring cloud platform. The battery anti-theft module obtains vehicle data and determines the operating status of the BMS. When the BMS is in a charging state, if a high-voltage loop interlock fault signal is detected in the vehicle, or a BMS internal communication fault signal is detected, the vehicle is at risk of battery theft. When the BMS is in an automatic wake-up state, if the cloud times out without receiving a monitoring message, or a BMS internal communication fault signal is detected, the vehicle is at risk of battery theft. When the BMS is in an available state, if a high-voltage loop interlock fault signal is detected in the vehicle, or a BMS internal communication fault signal is detected, the vehicle is at risk of battery theft. The specific implementation method of this system has been clearly described in the embodiment of the electric vehicle battery anti-theft method and will not be repeated here.

[0053] The above describes the specific embodiments of the present invention, but the present invention is not limited to the described embodiments. Based on the ideas provided by the present invention, the technical means in the above embodiments are transformed, replaced, and modified in a manner that is easy for a person skilled in the art to think of, and the functions they play are basically the same as those of the corresponding technical means in the present invention, and the objectives of the invention they achieve are also basically the same. The technical solutions formed in this way are formed by fine-tuning the above embodiments, and such technical solutions still fall within the scope of protection of the present invention.

Claims

1. A method for preventing the battery of an electric vehicle from being stolen, characterized in that: Acquire vehicle data and determine the working status of the BMS; when the BMS is in the charging state, if a high-voltage loop interlock fault signal is detected in the vehicle, or a BMS internal communication fault signal is detected, the vehicle is at risk of battery theft; when the BMS is in the automatic wake-up state, if the cloud times out and does not receive the monitoring message, or a BMS internal communication fault signal is detected, the vehicle is at risk of battery theft; when the BMS is in the available state, if a high-voltage loop interlock fault signal is detected in the vehicle, or a BMS internal communication fault signal is detected, the vehicle is at risk of battery theft.

2. The electric vehicle battery anti-theft method according to claim 1, characterized in that: Acquire vehicle data and increment all counters by 1; determine the BMS's operating status; when the BMS is charging, if no high-voltage loop interlock fault signal is detected, reset the high-voltage abnormal disconnection alarm counter; if no BMS internal communication fault signal is detected, reset the battery monitoring loss alarm counter; when the BMS is in automatic wake-up mode, if the cloud receives a monitoring message within the set time, reset the vehicle monitoring loss alarm counter; if no BMS internal communication fault signal is detected, reset the battery monitoring loss alarm counter; When the BMS is in an available state, if no high-voltage loop interlock fault signal is detected in the vehicle, the high-voltage abnormal disconnection alarm counter will be reset; if no BMS internal communication fault signal is detected, the battery monitoring loss alarm counter will be reset; within the set time, if any alarm counter is not in the reset state, the battery theft alarm will be triggered.

3. The electric vehicle battery anti-theft method according to claim 2, characterized in that: The vehicle uploads vehicle data at regular intervals, obtains vehicle data within the set time and makes subsequent judgments.

4. The electric vehicle battery anti-theft method according to claim 3, characterized in that: If the vehicle is not in sentry mode, and the vehicle is in a parked state, the vehicle driver's door is locked, and the BMS has no loop interlock fault and internal communication fault, the sentry mode is enabled; in the sentry mode, vehicle data is obtained and all counters are increased by 1.

5. The electric vehicle battery anti-theft method according to claim 4, characterized in that: If the vehicle is in sentry mode and is not in park, the sentry mode is turned off.

6. An electric vehicle battery anti-theft system, characterized in that: It includes a battery anti-theft module for connecting to a remote monitoring cloud platform, which obtains vehicle data and determines the working status of the BMS through the battery anti-theft module; when the BMS is in a charging state, if a high-voltage loop interlock fault signal is detected in the vehicle, or a BMS internal communication fault signal is detected, the vehicle is at risk of battery theft; when the BMS is in an automatic wake-up state, if the cloud times out and does not receive a monitoring message, or a BMS internal communication fault signal is detected, the vehicle is at risk of battery theft; when the BMS is in an available state, if a high-voltage loop interlock fault signal is detected in the vehicle, or a BMS internal communication fault signal is detected, the vehicle is at risk of battery theft.

7. The electric vehicle battery anti-theft system according to claim 6, characterized in that: Acquire vehicle data and increment all counters by 1; determine the BMS's operating status; when the BMS is charging, if no high-voltage loop interlock fault signal is detected, reset the high-voltage abnormal disconnection alarm counter; if no BMS internal communication fault signal is detected, reset the battery monitoring loss alarm counter; when the BMS is in automatic wake-up mode, if the cloud receives a monitoring message within the set time, reset the vehicle monitoring loss alarm counter; if no BMS internal communication fault signal is detected, reset the battery monitoring loss alarm counter; When the BMS is in an available state, if no high-voltage loop interlock fault signal is detected in the vehicle, the high-voltage abnormal disconnection alarm counter will be reset; if no BMS internal communication fault signal is detected, the battery monitoring loss alarm counter will be reset; within the set time, if any alarm counter is not in the reset state, the battery theft alarm will be triggered.

8. The electric vehicle battery anti-theft system according to claim 7, characterized in that: The vehicle uploads vehicle data at regular intervals, obtains vehicle data within the set time and makes subsequent judgments.

9. The electric vehicle battery anti-theft system according to claim 8, characterized in that: If the vehicle is not in sentry mode, and the vehicle is in a parked state, the vehicle driver's door is locked, and the BMS has no loop interlock fault and internal communication fault, the sentry mode is enabled; in the sentry mode, vehicle data is obtained and all counters are increased by 1.

10. The electric vehicle battery anti-theft system according to claim 9, characterized in that: If the vehicle is in sentry mode and is not in park, the sentry mode is turned off.

Images