CN110497796A - A kind of low-voltage power supply system and its control method of new-energy automobile - Google Patents

A kind of low-voltage power supply system and its control method of new-energy automobile Download PDF

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Publication number
CN110497796A
CN110497796A CN201910912136.2A CN201910912136A CN110497796A CN 110497796 A CN110497796 A CN 110497796A CN 201910912136 A CN201910912136 A CN 201910912136A CN 110497796 A CN110497796 A CN 110497796A
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CN
China
Prior art keywords
dcdc
relay
battery
low
battery pack
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
CN201910912136.2A
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Chinese (zh)
Inventor
刘贵如
刘志军
王陆林
候凤妮
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Anhui Polytechnic University
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Anhui Polytechnic University
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Filing date
Publication date
Application filed by Anhui Polytechnic University filed Critical Anhui Polytechnic University
Priority to CN201910912136.2A priority Critical patent/CN110497796A/en
Publication of CN110497796A publication Critical patent/CN110497796A/en
Pending legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION 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
    • B60L1/00Supplying electric power to auxiliary equipment of vehicles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION 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
    • B60L3/00Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B60L3/0023Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
    • B60L3/0046Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION 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
    • B60L3/00Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B60L3/04Cutting off the power supply under fault conditions
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION 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
    • B60L53/00Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/20Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by converters located in the vehicle
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION 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
    • B60L58/00Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION 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
    • B60L58/00Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/12Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
    • B60L58/14Preventing excessive discharging
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60QARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q9/00Arrangements or adaptations of signal devices not provided for in one of the preceding main groups, e.g. haptic signalling
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/70Energy storage systems for electromobility, e.g. batteries
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10Technologies relating to charging of electric vehicles
    • Y02T90/14Plug-in electric vehicles

Abstract

Present invention discloses a kind of low-voltage power supply systems of new-energy automobile, newly energy automobile is equipped with the battery pack as power source, described battery pack the two poles of the earth connect battery management system, the battery management system is equipped with the trickle charge interface of connection charger and the fast charge interface of connection direct current charge equipment, the input terminal of the two poles of the earth connection DCDC of the battery pack, the low-voltage output of the DCDC is directly connected to vehicle-mounted electricity consumption device, DCDC fuse and DCDC relay are in series between the anode and DCDC of the battery pack, the input end loop of the relay control interface connection DCDC relay of the battery management system.The system not only solves low-voltage power supply, reduces integral vehicle cost, and prevent battery pack during DCDC constantly powers again, solves the problems, such as battery pack low battery and battery over-discharge.

Description

A kind of low-voltage power supply system and its control method of new-energy automobile
Technical field
The present invention relates to new-energy automobile fields.
Background technique
Currently, new-energy automobile, no wheel is electric car or hybrid vehicle, and the power supply of low-voltage electrical apparatus controller is 12V/24V, use power supply plan for high-tension battery group by DCDC (high voltage direct current turns low-voltage DC) transformation after, to be vehicle-mounted Battery charging.Vehicular accumulator cell is low voltage equipment power supply.
Since conventional fuel oil automobile is without high-tension battery group, so that automobile electrical equipment must pass through driven by engine small electrical Motivation power generation comes to charge the battery.Also, need starter motor to drive internal combustion engine start at the start in conventional fuel oil automobile, therefore Need very big peak power.Therefore low tension battery is needed to store electricity.
Currently, the storage battery low-voltage power supply mode for the traditional vehicle that battery car from conventional fuel oil car transition, is continued to use.But it stores Battery low-voltage power supply mode, has the following disadvantages.
1, battery higher cost increases integral vehicle cost.
2, accumulator quality is heavier, because complete vehicle curb weight and complete-vehicle oil consumption and power consumption have very big relationship, is unfavorable for Vehicle lightweight.
3, battery volume is big, and occupancy vehicle space is more, is unfavorable for dynamical system arrangement.
4, vehicle uses storage battery power supply, and battery generally uses lead storage battery, and the service life is short, does not charge for a long time, is easy Over-discharge damage.
In view of the above-mentioned problems, can replace storage battery power supply by DCDC, DCDC takes battery pack high-voltage electricity to be converted to Low tension is vehicle power supply, but it is too low directly to take battery pack high-voltage electricity to easily cause battery pack SOC, and long-time car stowage is easy Put damage with causing battery pack.
Summary of the invention
It is a kind of using DCDC substitution storage battery power supply the technical problem to be solved by the present invention is to realize, and over-discharge can be prevented Battery pack and vehicle low-voltage power supply system.
To achieve the goals above, the technical solution adopted by the present invention are as follows: a kind of low-voltage power supply system of new-energy automobile, Newly energy automobile is equipped with the battery pack as power source, and described battery pack the two poles of the earth connect battery management system, the battery management System is equipped with the trickle charge interface of connection charger and the fast charge interface of connection direct current charge equipment, the two poles of the earth connection of the battery pack The input terminal of DCDC, the low-voltage output of the DCDC are directly connected to vehicle-mounted electricity consumption device, the anode of the battery pack and DCDC fuse and DCDC relay are in series between DCDC, the relay control interface of the battery management system connects DCDC The input end loop of relay.
The anode of the battery pack connects positive High voltage output route, and cathode connects cathode High voltage output route, it is described just Be in series with positive fuse and positive grade relay on extra-high voltage outlet line, the cathode High voltage output route be in series with negative grade after Electric appliance, the anode High voltage output route connect high-tension battery packet electrical source of power output interface with cathode High voltage output route.
Be fixed in the shell of the high-tension battery packet battery pack, negative grade relay, positive fuse, positive grade relay, DCDC fuse, DCDC relay, DCDC.
The relay control interface of the battery management system connects negative grade relay and the input terminal of positive grade relay returns Road.
The new-energy automobile includes pure electric automobile, hybrid vehicle, alkene material automobile.
The control method of low-voltage power supply system based on the new-energy automobile:
1) battery management system control DCDC relay is normally off;
2) when battery management system works, battery state information is obtained in real time;
3) when the battery state information of acquisition reaches the preset condition for disconnecting DCDC relay, then battery management system Cut off DCDC relay.
It is described 3) in, if vehicle is in driving status, delay cutoff DCDC relay, and reported by automobile audio It is alert.
It is described 3) in, the voice of alarm includes playing failure cause, will cutting off vehicle-mounted electricity consumption device power supply, Yi Ji The final stage of delay carries out countdown broadcasting to the cutoff action that will be carried out.
It is more than setting time when the vehicle non-driving status time, then battery management system cuts off DCDC relay, works as battery After management system receives charging signals, restore DCDC relay channel status.
The battery state information includes discharge capability information, electricity SOC information, fault message, the disconnection DCDC The condition of relay is that discharge capability is lower than setting value lower than setting value, electricity SOC and/or preset fault type occurs.
The present invention has the advantages that
1, cancel battery, kerb weight decline improves vehicle continuation of the journey;
2, integral vehicle cost reduces, and being conducive to automaker reduces integral vehicle cost;
3, arrangement battery is reduced.Be conducive to dynamical system arrangement;
4, energy intelligent recognition battery pack SOC low battery, automatic protection battery pack is not by over-discharge;
5, after vehicle power-off, DCDC can be activated by trickle charge or fast charge, the phase is made to work on;
6, prevent battery pack high-voltage electricity from drawing outside battery pack.
Detailed description of the invention
Below to width attached drawing every in description of the invention expression content and figure in label be briefly described:
Fig. 1 is the low-voltage power supply system schematic diagram of new-energy automobile;
Label in above-mentioned figure is equal are as follows: 1, high-tension battery packet;2, battery management system;3, trickle charge electrical interface;4, charger; 5, charging gun;6, direct current charge;7, battery pack;8, negative grade relay;9, positive grade fuse;10, positive grade relay;11,DCDC Fuse;12, DCDC relay;13,DCDC.
Specific embodiment
Below against attached drawing, by the description of the embodiment, for example related each component of a specific embodiment of the invention Shape, construction, the mutual alignment between each section and connection relationship, the effect of each section and working principle, manufacturing process and Operate with method etc., is described in further detail, to help those skilled in the art to inventive concept of the invention, technology Scheme has more complete, accurate and deep understanding.
As shown in Figure 1, the low-voltage power supply system of new-energy automobile include high-tension battery packet 1, battery management system 2 (BMS), Charger 4, charging gun 5, direct current charge 6, battery pack 7, negative grade relay 8, positive fuse 9, positive relay 10, DCDC are molten Disconnected device 11, DCDC relay 12, DCDC13 (high voltage direct current turns low-voltage direct) composition.
Be fixed in the shell of high-tension battery packet battery pack 7, negative grade relay 8, positive fuse 9, positive grade relay 10, DCDC fuse 11, DCDC relay 12, DCDC13.
Battery management system BMS2 is mainly managed battery pack, including to battery set charge/discharge ability, cell voltage Current power, the system indexs such as battery SOC/HOC are managed.
When high-tension battery packet 1 dispatches from the factory, output of the battery pack without high voltage power electricity and low-voltage electrical apparatus electricity.In automobile production And after assembling battery pack, direct current charge rifle or exchanging trickle charge rifle can be inserted, trickle charge charger 4 or direct current charge 6 can be externally defeated Low-voltage power supply is that battery management system 2 is powered out.Battery management system is to be attracted DCDC relay 12, to start DCDC13 is that external vehicle mounted electrical apparatus and battery management system 2 are powered.Vehicle starts to start normal function operation, according to vehicle demand It can carry out the actuation work of positive relay 10 or negative grade relay 8.
Battery pack 1 starts same with battery management system 2 after DCDC13 is activated by trickle charge charger 4 or direct current charge 6 Work is walked, DCDC relay 12 is outer in attracting state always, to externally carry out the output of low-voltage DC.Meanwhile cell tube Reason system 2 detects discharge capability/electricity SOC/ failure etc. of battery pack, detects electricity SOC in battery management system 2 In low, discharge capability is insufficient, have the factors such as catastrophe failure generation when.If vehicle is not in driving status, battery management system 2 I.e. cutting DCDC relay 12 stops output low tension.If vehicle is in driving status, battery management system 2 requests vehicle row It sails to safety zone and carries out delay cut-off.
Outside new-energy automobile is placed for a long time when non-driving status, this system can be right by battery management system 2 The factors such as battery capacity are detected, and prevent battery pack 7 in the state that DCDC13 is in and works always, continuous discharge leads to electricity Group 7 over-discharge in pond damages battery.Charging activation processing is only carried out when DCDC13 stops working.
Positive relay 10 can be controlled by battery management system 2, can also be according to vehicle demand by other controller controls System;Positive relay 10 would be likely placed inside battery pack according to vehicle scheme, can also be placed on outside battery pack.
Negative grade relay 8 can be controlled by battery management system 2, can also be according to vehicle demand by other controller controls System.Negative grade relay 8 can be placed on inside battery pack according to vehicle scheme, can also be placed on outside battery pack.
Positive grade fuse 9 can be placed on inside battery pack according to vehicle scheme, can also be placed on outside battery pack, it is also possible to Cancel.Positive fuse 9 only protects short circuit and overload, can be cancelled according to demand.
DCDC fuse 11, DC relay 12, DCDC13 can be placed on inside battery pack according to vehicle scheme, can also be put In other places of automobile.Direct current charge 6 meets electric power fast charge national standard, and low pressure controller utilization voltage range is 6-50V model In enclosing.
The present invention is exemplarily described above in conjunction with attached drawing, it is clear that the present invention implements not by aforesaid way Limitation, as long as the improvement for the various unsubstantialities that the inventive concept and technical scheme of the present invention carry out is used, or without changing It is within the scope of the present invention into the conception and technical scheme of the invention are directly applied to other occasions.

Claims (9)

1. a kind of low-voltage power supply system of new-energy automobile, newly energy automobile is equipped with the battery pack as power source, the battery Group the two poles of the earth connect battery management system, and the battery management system is equipped with the trickle charge interface and connection direct current charge of connection charger The fast charge interface of equipment, it is characterised in that: the input terminal of the two poles of the earth connection DCDC of the battery pack, the low pressure output of the DCDC End is directly connected to vehicle-mounted electricity consumption device, is in series with DCDC fuse and DCDC relay between the anode and DCDC of the battery pack Device, the input end loop of the relay control interface connection DCDC relay of the battery management system.
2. the low-voltage power supply system of new-energy automobile according to claim 1, it is characterised in that: the anode of the battery pack Positive High voltage output route is connected, cathode connects cathode High voltage output route, and anode high-voltage output line road is in series with just Pole fuse and positive grade relay, the cathode High voltage output route are in series with negative grade relay, the anode high-voltage output line Road connects high-tension battery packet electrical source of power output interface with cathode High voltage output route.
3. the low-voltage power supply system of new-energy automobile according to claim 2, it is characterised in that: the high-tension battery packet Be fixed in shell battery pack, negative grade relay, positive fuse, positive grade relay, DCDC fuse, DCDC relay, DCDC。
4. the low-voltage power supply system of new-energy automobile according to claim 2 or 3, it is characterised in that: the battery management The relay control interface of system connects the input end loop of negative grade relay and positive grade relay.
5. the low-voltage power supply system of new-energy automobile according to claim 4, it is characterised in that: the new-energy automobile packet Include pure electric automobile, hybrid vehicle, alkene material automobile.
6. the control method of the low-voltage power supply system based on the new-energy automobile any in claim 1-5, it is characterised in that:
1) battery management system control DCDC relay is normally off;
2) when battery management system works, battery state information is obtained in real time;
3) when the battery state information of acquisition reaches the preset condition for disconnecting DCDC relay, then battery management system is cut off DCDC relay.
It is described 3) in, if vehicle is in driving status, delay cutoff DCDC relay, and alarmed by automobile audio.
7. control method according to claim 6, it is characterised in that: it is described 3) in, the voice of alarm includes playing failure Reason will cut off vehicle-mounted electricity consumption device power supply and carry out in the final stage of delay to the cutoff action that will be carried out Countdown plays.
8. control method according to claim 7, it is characterised in that: when the vehicle non-driving status time being more than setting Between, then battery management system cuts off DCDC relay, after battery management system receives charging signals, restores DCDC relay Channel status.
9. according to control method described in claim 6,7 or 8, it is characterised in that: the battery state information includes electric discharge Ability information, electricity SOC information, fault message, the condition for disconnecting DCDC relay are that discharge capability is lower than setting value, electricity SOC is measured lower than setting value and/or preset fault type occurs.
CN201910912136.2A 2019-09-25 2019-09-25 A kind of low-voltage power supply system and its control method of new-energy automobile Pending CN110497796A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910912136.2A CN110497796A (en) 2019-09-25 2019-09-25 A kind of low-voltage power supply system and its control method of new-energy automobile

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910912136.2A CN110497796A (en) 2019-09-25 2019-09-25 A kind of low-voltage power supply system and its control method of new-energy automobile

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CN110497796A true CN110497796A (en) 2019-11-26

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111002827A (en) * 2019-12-30 2020-04-14 深圳一清创新科技有限公司 Unmanned vehicle power supply system and control method thereof
CN111660871A (en) * 2020-05-15 2020-09-15 浙江飞碟汽车制造有限公司 Novel power supply system and power supply method of new energy automobile
CN111717037A (en) * 2020-05-25 2020-09-29 东风柳州汽车有限公司 Light energy charging vehicle and charging method thereof

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111002827A (en) * 2019-12-30 2020-04-14 深圳一清创新科技有限公司 Unmanned vehicle power supply system and control method thereof
CN111002827B (en) * 2019-12-30 2021-07-23 深圳一清创新科技有限公司 Unmanned vehicle power supply system and control method thereof
CN111660871A (en) * 2020-05-15 2020-09-15 浙江飞碟汽车制造有限公司 Novel power supply system and power supply method of new energy automobile
CN111717037A (en) * 2020-05-25 2020-09-29 东风柳州汽车有限公司 Light energy charging vehicle and charging method thereof

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