CN111409503A - Power system of miniature electric automobile and control method thereof - Google Patents

Power system of miniature electric automobile and control method thereof Download PDF

Info

Publication number
CN111409503A
CN111409503A CN202010259969.6A CN202010259969A CN111409503A CN 111409503 A CN111409503 A CN 111409503A CN 202010259969 A CN202010259969 A CN 202010259969A CN 111409503 A CN111409503 A CN 111409503A
Authority
CN
China
Prior art keywords
voltage
heating
relay
vehicle
charging
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010259969.6A
Other languages
Chinese (zh)
Inventor
李志波
杨娟
张国能
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Suzhou Xuqiu Automobile Technology Co ltd
Original Assignee
Suzhou Xuqiu Automobile Technology Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Suzhou Xuqiu Automobile Technology Co ltd filed Critical Suzhou Xuqiu Automobile Technology Co ltd
Priority to CN202010259969.6A priority Critical patent/CN111409503A/en
Publication of CN111409503A publication Critical patent/CN111409503A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
    • B60L58/27—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries by heating
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

The invention discloses a power system of a miniature electric vehicle and a control method thereof, and the power system comprises a power system composition, a high-voltage electrifying process and a lithium battery pack charging and heating process, wherein the power system comprises a power storage battery pack, a motor controller, a direct current converter and a vehicle-mounted charger, the electrifying process is completed by BMS, MCU, OBC and other systems, and no whole Vehicle Control (VCU) is involved. On the premise of the existing whole vehicle power system architecture, the system is communicated with a Battery Management System (BMS), a Motor Controller (MCU), a vehicle-mounted charger (OBC) and the like through the CAN bus to control the whole vehicle power system to be safely powered on, and meanwhile, in the power-on process, the high-voltage fault of the whole vehicle power system CAN be accurately diagnosed and corresponding processing CAN be rapidly carried out.

Description

Power system of miniature electric automobile and control method thereof
Technical Field
The invention relates to the technical field of miniature electric automobiles, in particular to a power system of a miniature electric automobile and a control method thereof.
Background
In the prior art, the judgment on whether the pre-charging stage is completed or not is often failed in the power-on process, so that the high-voltage relay is adhered and the service life of a motor controller is reduced. The heat management logic is not known during charging, resulting in charging failure and even spontaneous combustion of the battery pack.
Patent publication No. CN102479983A discloses a charging control method and device for a power battery of an electric vehicle, which uses the power battery to perform charging and discharging in a continuous switching manner, and heats the power battery. Although the mode does not affect the arrangement space of the battery pack core, the charging and discharging characteristics of the power battery are poor under the low-temperature condition, and the continuous switching of charging and discharging can bring adverse effects to the performance of the power battery and shorten the service life of the power battery.
The patent publication No. CN103457318A discloses a charging and heating system and a heating method for a power battery of a pure electric vehicle, which utilize a vehicle control unit to detect the temperature T of the power battery from a battery management system, and determine whether the temperature T is less than or equal to a preset minimum temperature TCritical point of(ii) a And then whether the battery needs to be heated is judged, if so, an alternating current charging relay of a vehicle-mounted charger is closed, the whole vehicle control unit instructs the heat management system to control the PTC heater to be switched on and start low-temperature heating, and the heat management system and the whole vehicle control unit are arranged, so that a power system is complex.
Disclosure of Invention
The invention aims to provide a power system of a miniature electric automobile and a control method thereof, so as to improve the power-on safety and solve the problem of heating and charging of a low-temperature battery.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a miniature electric automobile's driving system, its includes power storage battery package, machine controller, direct current converter, on-vehicle machine that charges, power storage battery package includes lithium cell group and battery management system, be equipped with power battery circuit between the positive negative pole of lithium cell group, power battery circuit is including connecting anodal pre-charge circuit of lithium cell group and with the parallelly connected heating circuit of lithium cell group, be equipped with the pre-charge relay on the pre-charge circuit in proper order, the pre-charge relay is parallelly connected to be equipped with always positive relay, be equipped with heating film, heating relay on the heating circuit in proper order.
The battery management system is in control connection with the pre-charging relay, the main positive relay and the heating relay through a wire harness, and a pre-charging circuit and a heating circuit of the lithium battery pack are connected/disconnected.
The battery management system is in communication connection with the motor controller and the vehicle-mounted charger through a CAN line, and coordinates the work of the motor controller and the vehicle-mounted charger.
The invention provides another technical scheme: a method for high-voltage power-on of a miniature electric vehicle comprises the following steps:
step X1, when the power supply of the whole vehicle is in an ACC state, low-voltage electrification of components such as BMS, DCDC and instruments is carried out, and high-voltage electrification is carried out at the same time;
and step X2, after the power supply of the whole vehicle is turned ON from ACC, the MCU is electrified at low voltage, and the whole vehicle enters a drivable state.
Step X1 specifically includes:
step X11, low-voltage power-up is carried out in an ACC state;
BMS and meters are electrified at low voltage and initialized, and DCDC is electrified at low voltage. And after the BMS is initialized, if the fault that the high-voltage electrification is not allowed does not exist, entering a high-voltage electrification process.
Step X12, high-voltage power-on is carried out in an ACC state;
the BMS controls the pre-charging relay to perform a pre-charging process through the pre-charging resistor, and after pre-charging is finished, the main positive relay is closed, the pre-charging relay is disconnected, and high-voltage power-on is completed.
Step X2 specifically includes:
step X21, entering an ON gear state into a drivable state;
and the motor controller is electrified at low voltage in an ON gear state, the initialization is completed after the electrification, the high-voltage electrification completion state is judged according to the motor controller, if no fault exists, the motor controller enters a drivable state, and a READY lamp of the instrument is lightened.
Step X12, the specific process is as follows:
step X121, closing a pre-charging relay and timing;
step X122, detecting the voltage V of the outer endOuter coverWhether the inner end voltage V is reached within the preset time tInner partAnd pre-charge stream IPreparation ofWhether it is smaller than the preset current value K.
If within time t, VOuter cover＜X％VInner part，IPreparation ofIf the voltage is more than K, reporting the fault;
if within time t, VOuter cover≥X％VInner part，IPreparation ofIf the number is less than K, the pre-charging is finished;
step X123, controlling the total positive relay to be closed, and presetting the extension time tDelay time；
Step X124, disconnecting the pre-charging relay to complete high-voltage electrification;
and step X125, sending the information of the completion of the high-voltage electrification to the CAN bus.
The invention provides another technical scheme: a charging and heating control method for a lithium battery pack comprises the following steps:
step S1, electrifying the alternating current side of the vehicle-mounted charger, and outputting voltage to the BMS by the vehicle-mounted charger after self-checking is finished;
step S2, detecting the temperature T1 of the battery pack and judging whether the temperature T1 is less than the preset minimum temperature TCritical 1 of。
If the temperature T1 > TCritical 1 ofEntering a normal charging mode;
if the temperature T1 < TCritical 1 ofThe battery management system enters a low temperature heating mode.
Step S3, sending a low-temperature heating request, a charging request voltage and a charging request current to a vehicle-mounted charger, and outputting the voltage and the current by the vehicle-mounted charger;
step S4, the battery management system controls the heating relay to be switched on, and low-temperature heating is started;
step S5, disconnecting the main positive relay;
step S6, detecting the temperature T2 of the battery pack in the heating state, and judging whether the temperature T2 is greater than the preset minimum temperature T in the heating stateCritical 2 ofAnd T isCritical 2 of＞TCritical 1 of；
If the temperature T2 < TCritical 2 ofFeeding back a heating state to a vehicle-mounted charger for continuous heating;
if the temperature T2 > TCritical 2 ofThen is turned offAnd closing the positive relay, disconnecting the heating relay, exiting the low-temperature heating mode, and entering an alternating-current charging mode.
Compared with the prior art, the invention has the beneficial effects that: the battery management system coordinates the work of the motor controller, the direct current converter, the combination instrument and the vehicle-mounted charger, a whole vehicle control unit is omitted, and the system is simple in structure; in the charging process, the battery management system detects the state of the battery pack in real time, including the temperature, the voltage, the current and the like of the battery pack, manages various parameters of the battery pack, and preliminarily judges whether the temperature of the battery pack is lower than the preset minimum temperature T or not before chargingCritical 1 ofDuring the heating process of the battery pack, the battery management system judges whether the temperature of the battery pack is lower than the preset minimum temperature T againCritical 2 ofThe battery pack is charged under the low-temperature condition, the logic of the battery charging and control flow is strict, the judgment basis is clear, and the safe and stable operation of the electric automobile is guaranteed.
Drawings
FIG. 1 is a block diagram of the power system of a miniature electric vehicle according to the present invention;
FIG. 2 is a schematic view of the interior of the power storage battery pack of the present invention;
FIG. 3 is a schematic diagram of the relay and heating system inside the power storage battery pack of the present invention;
FIG. 4 is a power-on flow chart of the whole vehicle;
FIG. 5 is a power-on flow chart of the entire vehicle shown in FIG. 4;
FIG. 6 is a flow chart of the invention under the vehicle;
fig. 7 is a flow chart of heating for charging a lithium battery pack.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present invention is a power system of a micro electric vehicle, which includes a power storage battery pack 10, a Motor Controller (MCU)20, a direct current converter (DCDC)30, a vehicle-mounted charger (OBC)40, and a combination meter 50.
Referring to fig. 2 and 3, the power storage battery pack 10 includes a lithium battery pack 11 and a Battery Management System (BMS) 12. And a power battery circuit is arranged between the positive electrode and the negative electrode of the lithium battery pack 11 and comprises a pre-charging circuit 13 connected to the positive electrode of the lithium battery pack 11 and a heating circuit 14 connected with the lithium battery pack 11 in parallel. The precharge line 13 is provided with a precharge relay J1 and a precharge resistor R1 in this order. The pre-charging relay J1 and the pre-charging resistor R1 are connected in parallel with a main fuse and a main positive relay J2. The heating line 14 is provided with a heating film 141 and a heating relay J3 in this order.
Referring to fig. 1, the battery management system 12 is in communication connection with the motor controller 20, the dc converter 30 and the vehicle-mounted charger 40 through the CAN line, and coordinates the operations of the motor controller 20, the dc converter 30 and the vehicle-mounted charger 40.
Referring to fig. 2, the battery management system 12 is in control connection with a precharge relay J1, a main positive relay J2, and a heating relay J3 through a wire harness, and turns on/off a precharge line and a heating line of the lithium battery pack 11. The battery management system 12 is respectively connected with the lithium battery pack 11 and the heating circuit 14, detects the state of the lithium battery pack 11 in real time in the charging process, including the temperature, the voltage, the current and the like of the lithium battery pack 11, and manages various parameters of the lithium battery pack 11; the battery management system 12 is used for judging whether the temperature of the lithium battery pack 11 is lower than a preset minimum temperature TCritical 1 ofIf the temperature of the lithium battery pack 11 is lower than TCritical 1 ofThe battery management system 12 controls the heating film 141 to heat the lithium battery pack 11. If the temperature of the lithium battery pack 11 is higher than TCritical 1 ofThe lithium battery pack 11 can be directly charged. In the heating process of the lithium battery pack 11, the battery management system 12 judges the temperature of the lithium battery pack 11 in the heating state, and if the temperature of the lithium battery pack 11 in the heating state is higher than the preset minimum temperature T in the heating stateCritical 2 ofThe heating relay J3 is turned off, and if the temperature of the lithium battery pack 11 is lower than the preset temperature in the heating stateMinimum temperature T of constant heating stateCritical 2 ofThe heating is normally performed.
The motor controller 20 is a component that controls the motor to operate in a set direction, speed, and the like by active operation. If the vehicle ignition switch signal is ACC and the high voltage power-on condition is satisfied, the battery management system 12 sends a high voltage power-on command to perform high voltage power-on. When the vehicle ignition switch signal is switched from ACC to ON, the motor controller 20 is powered ON at low voltage, and after the self-checking is finished, if an instruction that the high-voltage power-ON is finished is received from the BMS, the motor controller enters a drivable state, and turns ON READY ON the instrument. The dc converter 30 is connected to the lithium battery pack 11 through a high voltage harness, and converts the high voltage dc into a low voltage dc to supply power to the battery management system 12.
Referring to fig. 2, the vehicle-mounted charger 40 is connected to the lithium battery pack 11 and the dc converter 30 through a high voltage harness, and converts ac power into dc power to supply power to the dc converter 30, thereby charging the lithium battery pack 11. The vehicle-mounted charger 40 is in communication connection with the battery management system 12, acquires the demand information sent by the battery management system 12, and returns the relevant charging information, that is, when the lithium battery pack 11 needs to be heated, the battery management system 12 sends a heating request, a voltage request and a current request to the vehicle-mounted charger 40, and the vehicle-mounted charger 40 enters a low-temperature charging mode and outputs current and voltage. Heating relay J3 is closed and total positive relay J2 is open.
In the low-temperature heating process, the main positive relay J2 is in an off state, the vehicle-mounted charger 40 supplies power to the heating film 141 and the direct-current converter 30, the main positive relay J2 is closed again after heating is completed, the heating relay J3 is off, and the lithium battery pack 11 enters normal charging.
Referring to fig. 4, another technical solution of the present invention is a method for performing high voltage power-on by using the power system of the electric vehicle, which specifically includes:
step X1: when the whole vehicle power supply is in an ACC state, BMS, DCDC, combination instruments and other components are electrified at low voltage, and simultaneously, the high voltage is electrified.
Step X1 of the present invention specifically includes:
step X11, ACC state low voltage power up:
BMS and combination meter are electrified at low voltage and initialized, and DCDC is electrified at low voltage. And after the BMS is initialized, if the fault that the high-voltage electrification is not allowed does not exist, entering a high-voltage electrification process.
Step X12, high-voltage power-up in ACC state:
the BMS controls the pre-charging relay to perform a pre-charging process through the pre-charging resistor, and after pre-charging is finished, the main positive relay is closed, the pre-charging relay is disconnected, and high-voltage power-on is completed.
Referring to fig. 5, step X12, the specific process is:
step X121, closing a pre-charging relay and timing;
step X122, detecting whether the voltage at the outer end is up to the voltage at the inner end within a preset time tInner partAnd pre-charge stream IPreparation ofWhether it is smaller than the preset current value K.
If within time t, VOuter cover＜X％VInner part，IPreparation ofIf the voltage is more than K, reporting the fault;
if within time t, VOuter cover≥X％VInner part，IPreparation ofIf the number is less than K, the pre-charging is finished;
step X123, controlling a main positive relay to be closed, and presetting an extension time t delay;
step X124, disconnecting the pre-charging relay to complete high-voltage electrification;
and step X125, sending the information of the completion of the high-voltage electrification to the CAN bus.
Step X2: after the power supply of the whole vehicle is turned to the ON state from the ACC, the motor controller is electrified at low voltage, the whole vehicle enters a drivable state, specifically, the motor controller is electrified at low voltage in the ON state, and initialization is completed after electrification. And judging the high-voltage power-on completion state according to the self. And if no fault exists, the vehicle enters a drivable state, and a READY lamp of the instrument is lightened.
The high-voltage power-OFF control process comprises the following specific steps that the battery management system detects that a power supply mode is OFF, controls each high-voltage device to stop working, and then controls the total positive relay J2 to be switched OFF to finish high-voltage power-OFF, and referring to fig. 6, the specific process is as follows:
in step S1a, the power mode is switched to the OFF gear.
And step S2a, the battery management system sends a non-Ready state, and the motor controller controls the Ready indicator lamp of the combination meter to be turned off.
In step S3a, the battery management system sends a motor controller sleep command.
And step S4a, powering off the battery management system after self-checking safety.
Step S5a, the master positive relay J2 is turned off and the battery management system is dormant.
Another technical solution of the present invention is a method for charging and heating a lithium battery pack by using the power system of the electric vehicle, which is shown in fig. 7 and specifically includes:
step S1, electrifying the alternating current side of the vehicle-mounted charger, and outputting 12V voltage to the BMS by the auxiliary power supply of the vehicle-mounted charger after self-checking is finished;
step S2, detecting the temperature T of the lithium battery pack 111And determining the temperature T1Whether or not it is less than the preset minimum temperature TCritical 1 of。
If the temperature T is1＞TCritical 1 ofThen enter normal charging mode.
If the temperature T is1＜TCritical 1 ofThe battery management system 12 enters a low temperature heating mode.
Step S3, sending the low-temperature heating request, the charging request voltage, and the charging request current to the vehicle-mounted charger 40, and the vehicle-mounted charger 40 outputting the voltage and the current.
In step S4, the battery management system 12 controls the heating relay J3 to close, and the heating film 141 starts low-temperature heating. During low temperature heating, the battery management system 12 sends a heating status to the onboard charger 40.
In step S5, the master positive relay J2 is turned off.
Step S6, detecting the temperature T2 of the lithium battery pack 141 in the heating state, and determining the temperature T2Whether it is higher than the preset minimum heating state temperature TCritical 2 ofAnd T isCritical 2 of＞TCritical 1 of。
If the temperature T is2＜TCritical 2 ofAnd feeds back the heating state to the vehicle-mounted charger 40.
If the temperature T is2＞TCritical 2 ofIf yes, the general positive relay J2 is closed, the heating relay J3 is opened, the low-temperature heating mode is exited, and the alternating-current charging mode is entered.
Step S7, an ac charging request is sent to the vehicle-mounted charger 40, and the vehicle-mounted charger 40 enters an ac charging mode and outputs a charging voltage and a charging current.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (7)

1. The utility model provides a miniature electric automobile's driving system, its includes power storage battery package, machine controller, direct current converter and on-vehicle machine that charges, a serial communication port, power storage battery package includes lithium cell group and battery management system, be equipped with the power battery circuit between the positive negative pole of lithium cell group, the power battery circuit is including connecting anodal pre-charge circuit of lithium cell group and with the parallelly connected heating circuit of lithium cell group, be equipped with the pre-charge relay in proper order on the pre-charge circuit, the pre-charge relay is parallelly connected to be equipped with total positive relay, be equipped with heating film, heating relay on the heating circuit in proper order.
2. The power system of a miniature electric vehicle as set forth in claim 1, wherein said battery management system is in control connection with said pre-charge relay, said main positive relay and said heating relay via a wiring harness to connect/disconnect a pre-charge line and a heating line of said lithium battery pack.
3. The power system of claim 1, wherein the battery management system is in communication connection with the motor controller and the vehicle-mounted charger via a CAN line to coordinate the operation of the motor controller and the vehicle-mounted charger.
4. A method for high-voltage power-on of a power system of a miniature electric vehicle is characterized by comprising the following steps:
step X1, when the power supply of the whole vehicle is in an ACC state, low-voltage electrification of components such as BMS, DCDC and combination meters is carried out, and high-voltage electrification is carried out at the same time;
and step X2, after the power supply of the whole vehicle is turned ON from ACC, the MCU is electrified at low voltage, and the whole vehicle enters a drivable state.
5. The method for high-voltage power-on of the power system of the miniature electric vehicle as claimed in claim 4, wherein step X1 specifically comprises:
step X11, low-voltage power-up is carried out in an ACC state;
the BMS and the combination instrument are electrified at low voltage and initialized, the DCDC is electrified at low voltage, and after the BMS is initialized, if no fault that the high-voltage electrification is not allowed exists, the high-voltage electrification process is started;
step X12, high-voltage power-on is carried out in an ACC state;
the BMS controls the pre-charging relay to perform a pre-charging process through the pre-charging resistor, and after pre-charging is finished, the main positive relay is closed, the pre-charging relay is disconnected, and high-voltage power-on is completed.
6. The method for high-voltage power-on of the miniature electric vehicle as claimed in claim 5, wherein the step X12 is as follows:
step X121, closing a pre-charging relay and timing;
step X122, detecting the voltage V of the outer endOuter coverWhether the inner end voltage V is reached within the preset time tInner partAnd pre-charge stream IPreparation ofWhether the current value is less than a preset current value K or not;
if within time t, VOuter cover＜X％VInner part，IPreparation ofIf the voltage is more than K, reporting the fault;
if within time t, VOuter cover≥X％VInner part，IPreparation ofIf the number is less than K, the pre-charging is finished;
step X123, controlling the total positive relay to be closed and presetting extensionTime tDelay time；
Step X124, disconnecting the pre-charging relay to complete high-voltage electrification;
and step X125, sending the information of the completion of the high-voltage electrification to the CAN bus.
7. A charging and heating control method for a lithium battery pack is characterized by comprising the following steps:
step S1, electrifying the alternating current side of the vehicle-mounted charger, and supplying power to the BMS by the vehicle-mounted charger after self-checking is finished;
step S2, detecting the temperature T of the battery pack1And determining the temperature T1Whether or not it is less than the preset minimum temperature TCritical 1 of；
If the temperature T is1＞TCritical 1 ofEntering a normal charging mode;
if the temperature T is1＜TCritical 1 ofThe battery management system enters a low temperature heating mode;
step S3, sending a low-temperature heating request, a charging request voltage and a charging request current to a vehicle-mounted charger, and outputting the voltage and the current by the vehicle-mounted charger;
step S4, the battery management system controls the heating relay to be switched on, and low-temperature heating is started;
step S5, disconnecting the main positive relay;
step S6, detecting the temperature T of the battery pack in the heating state2And determining the temperature T2Whether it is higher than the preset minimum heating state temperature TCritical 2 ofAnd T isCritical 2 of＞TCritical 1 of；
If the temperature T is2＜TCritical 2 ofFeeding back a heating state to a vehicle-mounted charger for continuous heating;
if the temperature T is2＞TCritical 2 ofAnd if the current is less than the preset value, closing the main positive relay, disconnecting the heating relay, exiting the low-temperature heating mode and entering the alternating-current charging mode.
CN202010259969.6A 2020-04-03 2020-04-03 Power system of miniature electric automobile and control method thereof Pending CN111409503A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010259969.6A CN111409503A (en) 2020-04-03 2020-04-03 Power system of miniature electric automobile and control method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010259969.6A CN111409503A (en) 2020-04-03 2020-04-03 Power system of miniature electric automobile and control method thereof

Publications (1)

Publication Number Publication Date
CN111409503A true CN111409503A (en) 2020-07-14

Family

ID=71488099

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010259969.6A Pending CN111409503A (en) 2020-04-03 2020-04-03 Power system of miniature electric automobile and control method thereof

Country Status (1)

Country Link
CN (1) CN111409503A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113335069A (en) * 2021-07-13 2021-09-03 奇瑞万达贵州客车股份有限公司 Control charging method of pure electric bus whole vehicle controller
CN113364104A (en) * 2021-07-16 2021-09-07 江苏兆能电子有限公司 Vehicle-mounted OBC parallel charging system and charging control method thereof
WO2022021286A1 (en) * 2020-07-31 2022-02-03 华为数字能源技术有限公司 Contact device, electromagnetic switch, on board charger, and new energy vehicle

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005269742A (en) * 2004-03-17 2005-09-29 Sanyo Electric Co Ltd Power source device for vehicle and switching method of contactor
CN101961983A (en) * 2010-09-09 2011-02-02 奇瑞汽车股份有限公司 Method for safely controlling electric vehicle
CN102874256A (en) * 2012-06-19 2013-01-16 浙江吉利汽车研究院有限公司杭州分公司 Method for starting hybrid sedan
CN104527545A (en) * 2015-01-04 2015-04-22 中通客车控股股份有限公司 Electric vehicle safety starting method and system
CN104734306A (en) * 2015-04-21 2015-06-24 中投仙能科技（苏州）有限公司 Lithium ion battery management system
CN106785120A (en) * 2016-12-29 2017-05-31 洛阳宝盈智控科技有限公司 A kind of electric automobile power supply system charging heating control method
CN108099685A (en) * 2018-02-06 2018-06-01 中航锂电技术研究院有限公司 Lithium ion battery for electric vehicle system and charging heating method
CN109229036A (en) * 2018-09-20 2019-01-18 爱驰汽车有限公司 Electric automobile whole electric source modes management method and system, storage medium and terminal
CN109624786A (en) * 2018-12-29 2019-04-16 蜂巢能源科技有限公司 Power battery preliminary filling resistance protection control method
CN110406426A (en) * 2019-07-29 2019-11-05 杭州鹏成新能源科技有限公司 A kind of lithium electricity fork truck specialized lithium battery pack system and control method

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005269742A (en) * 2004-03-17 2005-09-29 Sanyo Electric Co Ltd Power source device for vehicle and switching method of contactor
CN101961983A (en) * 2010-09-09 2011-02-02 奇瑞汽车股份有限公司 Method for safely controlling electric vehicle
CN102874256A (en) * 2012-06-19 2013-01-16 浙江吉利汽车研究院有限公司杭州分公司 Method for starting hybrid sedan
CN104527545A (en) * 2015-01-04 2015-04-22 中通客车控股股份有限公司 Electric vehicle safety starting method and system
CN104734306A (en) * 2015-04-21 2015-06-24 中投仙能科技（苏州）有限公司 Lithium ion battery management system
CN106785120A (en) * 2016-12-29 2017-05-31 洛阳宝盈智控科技有限公司 A kind of electric automobile power supply system charging heating control method
CN108099685A (en) * 2018-02-06 2018-06-01 中航锂电技术研究院有限公司 Lithium ion battery for electric vehicle system and charging heating method
CN109229036A (en) * 2018-09-20 2019-01-18 爱驰汽车有限公司 Electric automobile whole electric source modes management method and system, storage medium and terminal
CN109624786A (en) * 2018-12-29 2019-04-16 蜂巢能源科技有限公司 Power battery preliminary filling resistance protection control method
CN110406426A (en) * 2019-07-29 2019-11-05 杭州鹏成新能源科技有限公司 A kind of lithium electricity fork truck specialized lithium battery pack system and control method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022021286A1 (en) * 2020-07-31 2022-02-03 华为数字能源技术有限公司 Contact device, electromagnetic switch, on board charger, and new energy vehicle
CN113335069A (en) * 2021-07-13 2021-09-03 奇瑞万达贵州客车股份有限公司 Control charging method of pure electric bus whole vehicle controller
CN113364104A (en) * 2021-07-16 2021-09-07 江苏兆能电子有限公司 Vehicle-mounted OBC parallel charging system and charging control method thereof
CN113364104B (en) * 2021-07-16 2022-02-18 江苏兆能电子有限公司 Vehicle-mounted OBC parallel charging system and charging control method thereof

Similar Documents

Publication Publication Date Title
CN107599857B (en) Pure electric vehicle charging system and charging method based on lithium battery
CN109606203B (en) Power-on and power-off control method for double-energy-source electric drive system
CN110816365B (en) Double-source control system and control method thereof, and electric automobile
CN107199891B (en) Fuel cell automobile power-on and power-off control method, whole automobile controller and electric automobile
CN111251910B (en) Power-on starting method of fuel cell automobile dual-source hybrid power system
EP3154150B1 (en) Battery controller
US8575940B2 (en) Power supply device and method for detecting non-contact state of load connected to power supply device
US9929674B2 (en) Power supply system for vehicle
CN207345508U (en) A kind of pure electric automobile high voltage control box device
CN111409503A (en) Power system of miniature electric automobile and control method thereof
JP5359413B2 (en) Vehicle charging system and vehicle
CN105723585A (en) Charging control device
CN107611522B (en) A kind of battery method for heating and controlling for cell management system of electric automobile
US20130249468A1 (en) Battery management system for restricted idle vehicles
KR101470254B1 (en) Method of detecting welding of quick charge relay for eco-friendly vehicle
CN212709267U (en) Integrated high-voltage distribution box of pure electric vehicle
CN113386563B (en) Power-on control method based on full-power electricity-electricity hybrid fuel cell automobile
US11400825B2 (en) AC/DC EVSE charging system
CN204376500U (en) Charging system for electric automobile
CN114123378A (en) Power-taking control method of electric automobile
JP2010239670A (en) Device and method for control of vehicle
CN112895980B (en) New energy automobile low-temperature charging method and device
CN112440818B (en) Charging and discharging device of power battery, control method and vehicle
CN211335850U (en) High-voltage circuit system for electric automobile
CN112234691A (en) DCDC converter with integrated bin control function for power conversion cabinet

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
WD01 Invention patent application deemed withdrawn after publication

Application publication date: 20200714

WD01 Invention patent application deemed withdrawn after publication