Low-voltage power supply intelligent charging system and method for high-speed electric motorcycle

Abstract

The invention discloses a low-voltage power supply intelligent charging system and method for a high-speed motorcycle, and belongs to the technical field of electric motorcycle control. The low-voltage power supply intelligent charging system for the high-speed electric motorcycle comprises a remote signal terminal, a local signal unit, a vehicle control unit, a high-voltage output unit, a battery management unit, a DCDC conversion unit and a storage battery. The local signal unit communicates with the remote signal terminal, the vehicle control unit communicates with the local signal unit, and the high-voltage output unit, the battery management unit, the DCDC conversion unit and the storage battery communicate with the vehicle control unit. According to the low-voltage power supply intelligent charging system and method for the high-speed electric motorcycle, if the vehicle can automatically perform intelligent control on the low-voltage power supply, pre-estimate the electric quantity of the low-voltage power supply in advance and periodically and automatically maintain the low-voltage power supply, the service life of the low-voltage power supply can be prolonged, and the satisfaction degree of consumers to the vehicle can also be improved.

Description

Technical Field

[0001] The invention relates to a low-voltage power supply intelligent power replenishment system and method for high-speed electric motorcycles, belonging to the technical field of electric motorcycle control. Background Art

[0002] The current electric motorcycle market is booming. Electric motorcycles are not only increasing in functions, but also gradually improving in performance. With the changes in functions and performance, the number of electronic control components has also increased. How to better manage the low-voltage power supply of the electronic control power so that it can extend its service life while providing effective energy has become particularly important. At the same time, in daily use, electric motorcycles are often left unused for a long time. Due to reasons such as self-discharge of the low-voltage power supply, the result of long-term unused electric motorcycles is usually that the vehicle cannot be powered on.

[0003] At present, electric motorcycles in this scenario can usually only be powered manually by external devices to recharge the low-voltage power supply. This method is not only inconvenient to operate but also has certain safety hazards. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a low-voltage power supply intelligent charging system and method for high-speed electric motorcycles, so that the vehicle can automatically control the low-voltage power supply intelligently, estimate the power of the low-voltage power supply in advance, and automatically maintain it regularly, which can not only increase the service life of the low-voltage power supply, but also improve consumers' satisfaction with the use of the vehicle.

[0005] In order to solve the above technical problems, the technical solution of the present invention is:

[0006] On one hand, the present invention provides a low-voltage power supply intelligent power replenishment system for high-speed electric motorcycles, which includes a remote signal terminal, a local signal unit, a vehicle control unit, a high-voltage output unit, a battery management unit, a DCDC conversion unit and a battery;

[0007] The local signal unit communicates with the remote signal terminal, the vehicle control unit communicates with the local signal unit, and the high-voltage output unit, the battery management unit, the DCDC conversion unit and the battery all communicate with the vehicle control unit;

[0008] The output end of the high-voltage output unit is connected to the input end of the DCDC conversion unit, the output end of the DCDC conversion unit is connected to the battery, and the battery management unit is connected to the high-voltage output unit.

[0009] Furthermore, the local signal unit includes an intelligent driving controller, an on-board communication terminal and an RTC timer. The on-board communication terminal receives a signal sent by a remote signal terminal and wakes up the intelligent driving controller periodically through the RTC timer. After being awakened, the intelligent driving controller wakes up the vehicle control unit through the CAN network.

[0010] Furthermore, the high voltage output unit is a vehicle-mounted battery Pack.

[0011] Another aspect of the present invention provides a control method for a low-voltage power supply intelligent power supplement system for a high-speed electric motorcycle, which comprises the following steps:

[0012] Step S1, the vehicle control unit determines whether the vehicle enters a sleep mode;

[0013] Step S2: If the vehicle enters the sleep mode, the vehicle control unit determines whether the local signal unit is invalid;

[0014] Step S3: If the local signal unit is valid, when the remote signal terminal sends a signal to the local signal unit, the local signal unit wakes up the vehicle control unit; if the local signal unit fails, the battery management unit wakes up the vehicle control unit at a fixed time;

[0015] Step S4: When the vehicle control unit is awakened, the vehicle control unit detects the battery status;

[0016] Step S5: When the battery status meets the charging condition, the vehicle control unit detects whether the status of the high-voltage output unit and the DCDC conversion unit can enter the charging process;

[0017] Step S6: When the high voltage output unit and the DCDC conversion unit are in a state where they can enter the charging process, the high voltage output unit charges the battery through the DCDC conversion unit until the battery enters the charging termination state.

[0018] Furthermore, in step S2, the vehicle control unit determines whether the local signal unit is invalid, which specifically includes the following steps:

[0019] Step S21, the vehicle control unit collects the signal strength obtained by the local signal unit;

[0020] Step S22, determining whether the signal strength is less than level 1;

[0021] Step S23: If the signal strength is less than level 1, the local signal unit is determined to be invalid; if the signal strength is greater than level 1, the local signal unit is determined to be valid.

[0022] Furthermore, the energy replenishment conditions in step S5 include:

[0023] Energy replenishment conditions: 1. The vehicle is stopped;

[0024] Energy replenishment condition 2: side support is put down;

[0025] Energy replenishment condition three: the vehicle gear is in P gear;

[0026] Energy replenishment condition 4: CAN network is normal;

[0027] Energy replenishment condition 5: The battery voltage is lower than 40% of the rated voltage;

[0028] If the five energy replenishment conditions are met at the same time, it is determined that the battery meets the energy replenishment conditions.

[0029] Further, in step S5, the vehicle control unit detects whether the status of the high-voltage output unit and the DCDC conversion unit can enter the power replenishment process, which specifically includes the following steps:

[0030] Whether the high-voltage output unit meets the conditions for entering the power replenishment process includes:

[0031] High voltage output unit power supply condition 1. -5℃≤temperature≤45℃;

[0032] High voltage output unit power supply condition 2: CAN network is normal;

[0033] High-voltage output unit power replenishment condition three: The overall voltage of the high-voltage output unit is not less than 30% of the rated voltage;

[0034] High-voltage output unit recharging condition 4: The voltage of a single battery cell in the high-voltage output unit is ≥3.3V;

[0035] If the power replenishment conditions of the four high-voltage output units are met at the same time, it is determined that the high-voltage output unit can enter the power replenishment process;

[0036] Whether the DCDC conversion unit meets the conditions for entering the power replenishment process includes:

[0037] DCDC conversion unit power supply condition 1. Temperature ≤ 60℃;

[0038] DCDC conversion unit recharge condition 2: CAN network is normal;

[0039] DCDC conversion unit power supply condition three: input voltage ≥ 20V;

[0040] If the three DCDC conversion unit power replenishment conditions are met at the same time, it is determined that the DCDC conversion unit can enter the power replenishment process.

[0041] Furthermore, the power replenishment process in step S5 includes the following steps:

[0042] If the conditions that the battery management unit has no faults, the overall voltage and the cell voltage of the high-voltage output unit have reached the threshold, and the low-voltage charging command of the vehicle control unit is received are met, then according to the request of the battery management unit to close the main circuit negative relay and the DCDC positive main circuit relay sent by the vehicle control unit, the operation of the main circuit negative relay and the DCDC positive main circuit relay is performed, and the intelligent charging state of the battery management unit is set to Start; if the conditions that the battery management unit has no faults, the overall voltage and the cell voltage of the high-voltage output unit have reached the threshold, and the low-voltage charging command of the vehicle control unit is received are not met, then the intelligent charging state of the battery management unit is Stop;

[0043] The battery management unit sends the status of the main circuit negative relay and the DCDC positive main circuit relay to the DCDC conversion unit. The DCDC conversion unit determines whether the working state of the DCDC conversion unit is started according to the status of the two relays and the intelligent power replenishment command of the vehicle control unit; if the status of the main circuit negative relay and the DCDC positive main circuit relay are both Closed, and the intelligent power replenishment command of the vehicle control unit is Start, the DCDC conversion unit status is Run, and the DCDC conversion unit enable work request is Enable; otherwise, the DCDC conversion unit status is Standby;

[0044] After the vehicle control unit obtains that the state of the DCDC conversion unit is Run, it requests the DCDC conversion unit to output a specified voltage and current;

[0045] The DCDC conversion unit controls the output voltage and current according to the request of the vehicle control unit. If the DCDC conversion unit can work normally, the current is within the set threshold range, and the vehicle control unit's intelligent power replenishment command is Start, then the DCDC intelligent power replenishment state is Start; if the DCDC conversion unit can work normally, then the DCDC intelligent power replenishment state is Stop;

[0046] The vehicle control unit determines whether to continue the intelligent charging state of the vehicle control unit according to the current voltage of the low-voltage power supply, the single charging time, the intelligent charging state of the battery management unit, the intelligent charging state of the DCDC conversion unit and the intelligent charging request of the user;

[0047] If any one of the intelligent charging conditions is met, the vehicle control unit stops the intelligent charging and informs the DCDC conversion unit of the information; if all the conditions in the intelligent charging conditions are not met, the vehicle control unit continues the intelligent charging;

[0048] The intelligent charging conditions are: the upper limit voltage of the low-voltage power supply charging, the upper limit of the single charging time, the intelligent charging state of the battery management unit is Stop, the intelligent charging state of the DCDC is Stop, and the user's intelligent charging request is Stop.

[0049] Further, in step S6, when it is detected that the battery meets any of the following end-of-energy-replenishment conditions, the end-of-energy-replenishment state is entered:

[0050] End of energy replenishment condition 1. Battery voltage ≥ 14.3V;

[0051] End of recharging condition 2: Single recharging time ≥ 120 minutes.

[0052] Furthermore, in step S6, if any of the following forced energy replenishment termination situations occurs in the high voltage output unit or the DCDC conversion unit, the energy replenishment is terminated immediately:

[0053] The high-voltage output unit is forced to end the energy replenishment. 1. Abnormal temperature;

[0054] The second situation where the high-voltage output unit is forced to end the energy replenishment is that the CAN network is abnormal;

[0055] The high-voltage output unit is forced to end the energy replenishment situation three: the negative relay of the main circuit is open or sticking;

[0056] The fourth situation where the high-voltage output unit is forced to end the energy replenishment is that the DCDC positive main circuit relay is open or sticking;

[0057] DCDC conversion unit forced to end energy replenishment situation 1. Temperature abnormality;

[0058] DCDC conversion unit forced to end energy replenishment situation 2: CAN network abnormality;

[0059] The DCDC conversion unit is forced to end the energy replenishment situation three: output power overload.

[0060] By adopting the above technical solution, the present invention provides a complete feasible solution for intelligently replenishing the vehicle's low-voltage power supply. By coordinating the orderly operation of various components on the vehicle through information interaction and combining reasonable control strategies, the vehicle's functional improvement is achieved. At the same time, the present invention does not increase the additional hardware cost of the vehicle. Functionally, it can effectively reduce the probability of damage to the low-voltage power supply and increase the service life of the low-voltage power supply. The vehicle background is intelligently realized without the need for additional user operations. It can improve user satisfaction with the vehicle and brand. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] Figure 1 This is a principle block diagram of a low-voltage power supply intelligent power supplement system for high-speed electric motorcycles of the present invention;

[0062] Figure 2 The present invention is a flow chart of a control method of a low-voltage power supply intelligent power supplement system for a high-speed electric motorcycle. DETAILED DESCRIPTION

[0063] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments in conjunction with the accompanying drawings.

[0064] Embodiment 1

[0065] like Figure 1 As shown, this embodiment provides a low-voltage power supply intelligent charging system for high-speed electric motorcycles, which includes a remote signal terminal, a local signal unit, a vehicle control unit, a high-voltage output unit, a battery management unit, a DCDC conversion unit and a battery.

[0066] The local signal unit communicates with the remote signal terminal, the vehicle control unit communicates with the local signal unit, and the high-voltage output unit, the battery management unit, the DCDC conversion unit and the battery all communicate with the vehicle control unit. The output end of the high-voltage output unit is connected to the input end of the DCDC conversion unit, the output end of the DCDC conversion unit is connected to the battery, and the battery management unit is connected to the high-voltage output unit.

[0067] Among them, both the local signal unit and the battery management unit can wake up the vehicle control unit, and the local signal unit takes precedence over the battery management unit in waking up the vehicle control unit.

[0068] The remote signal terminal of this embodiment includes a mobile phone terminal and a client.

[0069] The local signal unit of this embodiment includes a smart driving controller (CDDC), an on-board communication terminal (TBOX) and an RTC timer. The on-board communication terminal receives a signal sent by a remote signal terminal and wakes up the smart driving controller regularly through the RTC timer. After being woken up, the smart driving controller wakes up the vehicle control unit through the CAN network.

[0070] The high-voltage output unit of this embodiment is a vehicle-mounted battery Pack, and the battery management unit is a BMS battery management module mounted on the high-voltage output unit.

[0071] The DCDC conversion unit of this embodiment is generally an on-board DCDC (direct current-to-direct current) converter, which can convert the DC 72V voltage output by the high-voltage output unit into a DC 12V voltage and then output it to charge the battery.

[0072] The storage battery of this embodiment communicates with the vehicle control unit through electrical signals on the one hand, and is electrically connected to the DCDC conversion unit for charging on the other hand.

[0073] Embodiment 2

[0074] like Figure 2 As shown, this embodiment provides a control method for a low-voltage power supply intelligent power supplement system for a high-speed electric motorcycle, comprising the following steps:

[0075] Step S1, the vehicle control unit determines whether the vehicle enters a sleep mode;

[0076] Step S2: If the vehicle enters the sleep mode, the vehicle control unit determines whether the local signal unit is invalid;

[0077] Step S3: If the local signal unit is valid, when the remote signal terminal sends a signal to the local signal unit, the local signal unit wakes up the vehicle control unit; if the local signal unit fails, the battery management unit wakes up the vehicle control unit at a fixed time;

[0078] Step S4: When the vehicle control unit is awakened, the vehicle control unit detects the battery status;

[0079] Step S5: When the battery status meets the charging condition, the vehicle control unit detects whether the status of the high-voltage output unit and the DCDC conversion unit can enter the charging process;

[0080] Step S6: When the high voltage output unit and the DCDC conversion unit are in a state where they can enter the charging process, the high voltage output unit charges the battery through the DCDC conversion unit until the battery enters the charging termination state.

[0081] In step S2 of this embodiment, the vehicle control unit determines whether the local signal unit is invalid, which specifically includes the following steps:

[0082] Step S21, the vehicle control unit collects the signal strength obtained by the local signal unit;

[0083] Step S22, determining whether the signal strength is less than level 1;

[0084] Step S23: If the signal strength is less than level 1, it means that the signal strength is very weak and the signal quality is poor, and the local signal unit is determined to be invalid; if the signal strength is greater than level 1, the local signal unit is determined to be valid.

[0085] The energy replenishment conditions in step S5 of this embodiment include:

[0086] Energy replenishment conditions: 1. The vehicle is stopped;

[0087] Energy replenishment condition 2: side support is put down;

[0088] Energy replenishment condition three: the vehicle gear is in P gear;

[0089] Energy replenishment condition 4: CAN network is normal;

[0090] Energy replenishment condition 5: The battery voltage is lower than 40% of the rated voltage;

[0091] If the five energy replenishment conditions are met at the same time, it is determined that the battery meets the energy replenishment conditions.

[0092] In step S5 of this embodiment, the vehicle control unit detects whether the status of the high-voltage output unit and the DCDC conversion unit can enter the power replenishment process, which specifically includes the following steps:

[0093] Whether the high-voltage output unit meets the conditions for entering the power replenishment process includes:

[0094] High voltage output unit power supply condition 1. -5℃≤temperature≤45℃;

[0095] High voltage output unit power supply condition 2: CAN network is normal;

[0096] High-voltage output unit power replenishment condition three: The overall voltage of the high-voltage output unit is not less than 30% of the rated voltage;

[0097] High-voltage output unit recharging condition 4: The voltage of a single battery cell in the high-voltage output unit is ≥3.3V;

[0098] If the power replenishment conditions of the four high-voltage output units are met at the same time, it is determined that the high-voltage output unit can enter the power replenishment process;

[0099] Whether the DCDC conversion unit meets the conditions for entering the power replenishment process includes:

[0100] DCDC conversion unit power supply condition 1. Temperature ≤ 60℃;

[0101] DCDC conversion unit recharge condition 2: CAN network is normal;

[0102] DCDC conversion unit power supply condition three: input voltage ≥ 20V;

[0103] If the three DCDC conversion unit power replenishment conditions are met at the same time, it is determined that the DCDC conversion unit can enter the power replenishment process.

[0104] The power replenishment process in step S5 of this embodiment includes the following steps:

[0105] If the conditions that the battery management unit has no faults, the overall voltage and the cell voltage of the high-voltage output unit have reached the threshold, and the low-voltage charging command of the vehicle control unit is received are met, then according to the request of the battery management unit to close the main circuit negative relay and the DCDC positive main circuit relay sent by the vehicle control unit, the operation of the main circuit negative relay and the DCDC positive main circuit relay is performed, and the intelligent charging state of the battery management unit is set to Start; if the conditions that the battery management unit has no faults, the overall voltage and the cell voltage of the high-voltage output unit have reached the threshold, and the low-voltage charging command of the vehicle control unit is received are not met, then the intelligent charging state of the battery management unit is Stop;

[0106] The battery management unit sends the status of the main circuit negative relay and the DCDC positive main circuit relay to the DCDC conversion unit. The DCDC conversion unit determines whether the working state of the DCDC conversion unit is started according to the status of the two relays and the intelligent power replenishment command of the vehicle control unit; if the status of the main circuit negative relay and the DCDC positive main circuit relay are both Closed, and the intelligent power replenishment command of the vehicle control unit is Start, the DCDC conversion unit status is Run, and the DCDC conversion unit enable work request is Enable; otherwise, the DCDC conversion unit status is Standby;

[0107] After the vehicle control unit obtains that the state of the DCDC conversion unit is Run, it requests the DCDC conversion unit to output a specified voltage and current;

[0108] The DCDC conversion unit controls the output voltage and current according to the request of the vehicle control unit. If the DCDC conversion unit can work normally, the current is within the set threshold range, and the vehicle control unit's intelligent power replenishment command is Start, then the DCDC intelligent power replenishment state is Start; if the DCDC conversion unit can work normally, then the DCDC intelligent power replenishment state is Stop;

[0109] The vehicle control unit determines whether to continue the intelligent charging state of the vehicle control unit according to the current voltage of the low-voltage power supply, the single charging time, the intelligent charging state of the battery management unit, the intelligent charging state of the DCDC conversion unit and the intelligent charging request of the user;

[0110] If any of the intelligent charging conditions is met, the vehicle control unit stops intelligent charging and informs the DCDC conversion unit of the information, and the instrument display is displayed at the same time; if all the conditions in the intelligent charging conditions are not met, the vehicle control unit continues intelligent charging;

[0111] The intelligent charging conditions are: the upper limit voltage of the low-voltage power supply charging, the upper limit of the single charging time, the intelligent charging state of the battery management unit is Stop, the intelligent charging state of the DCDC is Stop, and the user's intelligent charging request is Stop.

[0112] In step S6 of this embodiment, when it is detected that the battery meets any of the following end-of-energy-replenishment conditions, the energy-replenishment end state is entered:

[0113] End of energy replenishment condition 1. Battery voltage ≥ 14.3V;

[0114] End of recharging condition 2: Single recharging time ≥ 120 minutes.

[0115] In step S6 of this embodiment, if any of the following forced energy replenishment termination situations occurs in the high voltage output unit or the DCDC conversion unit, the energy replenishment is terminated immediately:

[0116] The high-voltage output unit is forced to end the energy replenishment. 1. Abnormal temperature (too high or too low temperature);

[0117] The second situation where the high-voltage output unit is forced to end the energy replenishment is that the CAN network is abnormal;

[0118] The high-voltage output unit is forced to end the energy replenishment situation three: the negative relay of the main circuit is open or sticking;

[0119] The fourth situation where the high-voltage output unit is forced to end the energy replenishment is that the DCDC positive main circuit relay is open or sticking;

[0120] The DCDC conversion unit is forced to end the energy replenishment situation 1. Abnormal temperature (too high or too low temperature);

[0121] DCDC conversion unit forced to end energy replenishment situation 2: CAN network abnormality;

[0122] The DCDC conversion unit is forced to end the energy replenishment situation three: output power overload.

[0123] The specific embodiments described above further illustrate the technical problems, technical solutions and beneficial effects solved by the present invention. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A low-voltage power supply intelligent power replenishment system for high-speed electric motorcycles, characterized by: It includes a remote signal terminal, a local signal unit, a vehicle control unit, a high voltage output unit, a battery management unit, a DCDC conversion unit and a battery; The local signal unit communicates with the remote signal terminal, the vehicle control unit communicates with the local signal unit, and the high-voltage output unit, the battery management unit, the DCDC conversion unit and the battery all communicate with the vehicle control unit; The output end of the high-voltage output unit is connected to the input end of the DCDC conversion unit, the output end of the DCDC conversion unit is connected to the battery, and the battery management unit is connected to the high-voltage output unit.

2. The low-voltage power supply intelligent power supplement system for high-speed electric motorcycles according to claim 1 is characterized in that: The local signal unit includes an intelligent driving controller, an on-board communication terminal and an RTC timer. The on-board communication terminal receives a signal sent by a remote signal terminal and wakes up the intelligent driving controller regularly through the RTC timer. After being woken up, the intelligent driving controller wakes up the vehicle control unit through the CAN network.

3. The low-voltage power supply intelligent power supplement system for high-speed electric motorcycles according to claim 1 is characterized in that: The high voltage output unit is a vehicle-mounted battery pack.

4. A control method for a low-voltage power supply intelligent power supplement system for a high-speed electric motorcycle according to any one of claims 1 to 3, characterized in that: It includes the following steps: Step S1, the vehicle control unit determines whether the vehicle enters a sleep mode; Step S2: If the vehicle enters the sleep mode, the vehicle control unit determines whether the local signal unit is invalid; Step S3: If the local signal unit is valid, when the remote signal terminal sends a signal to the local signal unit, the local signal unit wakes up the vehicle control unit; if the local signal unit fails, the battery management unit wakes up the vehicle control unit at a fixed time; Step S4: When the vehicle control unit is awakened, the vehicle control unit detects the battery status; Step S5: When the battery status meets the charging condition, the vehicle control unit detects whether the status of the high-voltage output unit and the DCDC conversion unit can enter the charging process; Step S6: When the high voltage output unit and the DCDC conversion unit are in a state where they can enter the charging process, the high voltage output unit charges the battery through the DCDC conversion unit until the battery enters the charging termination state.

5. The control method according to claim 4, characterized in that: In step S2, the vehicle control unit determines whether the local signal unit is invalid, which specifically includes the following steps: Step S21, the vehicle control unit collects the signal strength obtained by the local signal unit; Step S22, determining whether the signal strength is less than level 1; Step S23: If the signal strength is less than level 1, the local signal unit is determined to be invalid; if the signal strength is greater than level 1, the local signal unit is determined to be valid.

6. The control method according to claim 4, characterized in that: The energy replenishment conditions in step S5 include: Energy replenishment conditions:

1. The vehicle is stopped; Energy replenishment condition 2: side support is put down; Energy replenishment condition three: the vehicle gear is in P gear; Energy replenishment condition 4: CAN network is normal; Energy replenishment condition 5: The battery voltage is lower than 40% of the rated voltage; If the five energy replenishment conditions are met at the same time, it is determined that the battery meets the energy replenishment conditions.

7. The control method according to claim 4, characterized in that: In step S5, the vehicle control unit detects whether the status of the high-voltage output unit and the DCDC conversion unit can enter the power replenishment process, which specifically includes the following steps: Whether the high-voltage output unit meets the conditions for entering the power replenishment process includes: High voltage output unit power supply condition 1. -5℃≤temperature≤45℃; High voltage output unit power supply condition 2: CAN network is normal; High-voltage output unit power replenishment condition three: The overall voltage of the high-voltage output unit is not less than 30% of the rated voltage; High-voltage output unit recharging condition 4: The voltage of a single battery cell in the high-voltage output unit is ≥3.3V; If the power replenishment conditions of the four high-voltage output units are met at the same time, it is determined that the high-voltage output unit can enter the power replenishment process; Whether the DCDC conversion unit meets the conditions for entering the power replenishment process includes: DCDC conversion unit power supply condition 1. Temperature ≤ 60℃; DCDC conversion unit recharge condition 2: CAN network is normal; DCDC conversion unit power supply condition three: input voltage ≥ 20V; If the three DCDC conversion unit power replenishment conditions are met at the same time, it is determined that the DCDC conversion unit can enter the power replenishment process.

8. The control method according to claim 4, characterized in that: The power replenishment process in step S5 includes the following steps: If the conditions that the battery management unit has no faults, the overall voltage and the cell voltage of the high-voltage output unit have reached the threshold, and the low-voltage charging command of the vehicle control unit is received are met, then according to the request of the battery management unit to close the main circuit negative relay and the DCDC positive main circuit relay sent by the vehicle control unit, the operation of the main circuit negative relay and the DCDC positive main circuit relay is performed, and the intelligent charging state of the battery management unit is set to Start; if the conditions that the battery management unit has no faults, the overall voltage and the cell voltage of the high-voltage output unit have reached the threshold, and the low-voltage charging command of the vehicle control unit is received are not met, then the intelligent charging state of the battery management unit is Stop; The battery management unit sends the status of the main circuit negative relay and the DCDC positive main circuit relay to the DCDC conversion unit. The DCDC conversion unit determines whether the working state of the DCDC conversion unit is started according to the status of the two relays and the intelligent power replenishment command of the vehicle control unit; if the status of the main circuit negative relay and the DCDC positive main circuit relay are both Closed, and the intelligent power replenishment command of the vehicle control unit is Start, the DCDC conversion unit status is Run, and the DCDC conversion unit enable work request is Enable; otherwise, the DCDC conversion unit status is Standby; After the vehicle control unit obtains that the state of the DCDC conversion unit is Run, it requests the DCDC conversion unit to output a specified voltage and current; The DCDC conversion unit controls the output voltage and current according to the request of the vehicle control unit. If the DCDC conversion unit can work normally, the current is within the set threshold range, and the vehicle control unit's intelligent power replenishment command is Start, then the DCDC intelligent power replenishment state is Start; if the DCDC conversion unit can work normally, then the DCDC intelligent power replenishment state is Stop; The vehicle control unit determines whether to continue the intelligent charging state of the vehicle control unit according to the current voltage of the low-voltage power supply, the single charging time, the intelligent charging state of the battery management unit, the intelligent charging state of the DCDC conversion unit and the intelligent charging request of the user; If any one of the intelligent charging conditions is met, the vehicle control unit stops the intelligent charging and informs the DCDC conversion unit of the information; if all the conditions in the intelligent charging conditions are not met, the vehicle control unit continues the intelligent charging; The intelligent charging conditions are: the upper limit voltage of the low-voltage power supply charging, the upper limit of the single charging time, the intelligent charging state of the battery management unit is Stop, the intelligent charging state of the DCDC is Stop, and the user's intelligent charging request is Stop.

9. The control method according to claim 4, characterized in that: In step S6, when it is detected that the battery meets any of the following end-of-energy-replenishment conditions, the end-of-energy-replenishment state is entered: End of energy replenishment condition 1. Battery voltage ≥ 14.3V; End of recharging condition 2: Single recharging time ≥ 120 minutes.

10. The control method according to claim 4, characterized in that: In step S6, if any of the following forced energy replenishment termination situations occurs in the high voltage output unit or the DCDC conversion unit, the energy replenishment is terminated immediately: The high-voltage output unit is forced to end the energy replenishment.

1. Abnormal temperature; The second situation where the high-voltage output unit is forced to end the energy replenishment is that the CAN network is abnormal; The high-voltage output unit is forced to end the energy replenishment situation three: the negative relay of the main circuit is open or sticking; The fourth situation where the high-voltage output unit is forced to end the energy replenishment is that the DCDC positive main circuit relay is open or sticking; DCDC conversion unit forced to end energy replenishment situation 1. Temperature abnormality; DCDC conversion unit forced to end energy replenishment situation 2: CAN network abnormality; The DCDC conversion unit is forced to end the energy replenishment situation three: output power overload.

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