CN107146917B - Method for vehicle-mounted two sets of battery systems parallel connection - Google Patents
Method for vehicle-mounted two sets of battery systems parallel connection Download PDFInfo
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- CN107146917B CN107146917B CN201710380823.5A CN201710380823A CN107146917B CN 107146917 B CN107146917 B CN 107146917B CN 201710380823 A CN201710380823 A CN 201710380823A CN 107146917 B CN107146917 B CN 107146917B
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
-
- 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
-
- 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
- B60L58/18—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules
- B60L58/19—Switching between serial connection and parallel connection of battery modules
-
- 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
- B60L58/18—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules
- B60L58/21—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules having the same nominal voltage
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- 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)
- Power Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Sustainable Energy (AREA)
- Transportation (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention discloses a kind of methods for vehicle-mounted two sets of battery systems parallel connection; it includes total positive relay etc.; total positive relay, battery management system, the first parallel connection relay, protective relay in parallel, the second relay in parallel are in parallel; protective relay in parallel is connected with preliminary filling resistance; battery management system is connected with 24V power supply, and the first battery system and the second battery system are used in parallel for the power supply of at least one electronic load.The present invention solves in existing power vehicle power supply system and improves charge-discharge magnification in the case where energy density, energy requirement etc. are constant；Comparing with traditional design can effectively reduce charging and discharging currents, and the fever due to caused by high current is effectively reduced and connects the problem on designing with long-term existence mould group is improved to the fever of high tension apparatus damage, reduction battery modules junction；It solves the problems, such as the parallel connection instantaneous large-current ring current shock when used in parallel, keeps battery system relatively reliable, and the service life of electrical part can be extended.
Description
Technical field
The present invention relates to a kind of on-vehicle battery system regions, in parallel for vehicle-mounted two sets of battery systems more particularly to one kind
Method.
Background technique
It is in the prior art mainly power resources of a set of battery system as automobile, however as the continuous of social demand
Variation, voltage platform is constantly soaring, and it is urgent that high magnification exports demand, but the design of high current inputoutput pair battery system is brought
Apparent difficult, the requirement especially to high pressure connection is higher and higher.
In order to improve social demand, use the mode of two systems parallel connection as the power source of power vehicle, it can be achieved that height
The characteristics of voltage, single system low current, is effectively improved the influence for leading to problem of temperature rise to device since electric current is excessive at present.Before
Useful super capacitor as power vehicle power source, this mode may be implemented problem solve the problems, such as but bring simultaneously it is new,
Specific energy is low, self discharge multiplying power is big, this just greatly limits the use of supercapacitor.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of method for vehicle-mounted two sets of battery systems parallel connection, solutions
Deficiency of the existing battery system as power source in certainly existing automobile, can be in the case where energy density, energy requirement etc. be constant
Improve charge-discharge magnification.
The present invention is that above-mentioned technical problem is solved by following technical proposals: one kind being used for vehicle-mounted two sets of battery systems
Method in parallel, which is characterized in that it includes total positive relay, always negative relay, battery management system, 24V power supply, first be simultaneously
Join relay, protective relay in parallel, the second relay, preliminary filling resistance, the first battery system, the second battery system in parallel, always
Positive relay, battery management system, the first parallel connection relay, protective relay in parallel, the second relay in parallel are in parallel, and UNPROFOR
Shield relay is connected with preliminary filling resistance, the first relay and the first cell system in series in parallel, the second relay and second in parallel
Cell system in series, battery management system are connected with 24V power supply, and the first battery system and the second battery system are used in parallel for extremely
Few electronic load power supply, total positive relay, electronic load, total negative relay are sequentially connected in series, when vehicle high-pressure system needs
When electric power, the relay in parallel of closure second is closed protective relay in parallel later；First battery system and the second battery system it
Between can have pressure difference, pressure difference can be calculated by battery management system, it is assumed that the first cell system voltage is than the second battery system
Voltage is high, and the first cell system voltage is pre-charged to the second battery system, when the first battery system and the second battery system
Between pressure difference when being less than the pressure difference of setting, the relay in parallel of closure first disconnects protective relay in parallel, pre-charge process knot
Beam.
Preferably, first battery system is with the second battery system all by two groups of same sizes, the battery of identical quantity
Group system is connected in series, and the first battery system, the second battery system draw electrode line and negative line, the first battery system outward respectively
System presses 50%SOC capacity configuration with the second battery system.
Preferably, the switching of the battery management system control relay, what record current divider each stage changed over time
Size of current according to the preliminary filling resistance that drop stream length of time selection is suitable, and calculates the heating power of preliminary filling resistance.
Preferably, total positive relay, the phase is in an off state total negative relay always before testing；Electronic load exists
It is used in later period test；24V power supply is in working condition always.
Preferably, after the battery management system closure second relay in parallel, logic is carried out to protective relay in parallel
Control.
Preferably, the pre-charge process terminates to refer to that protective relay in parallel, the precharge of preliminary filling resistance terminate.
The positive effect of the present invention is that: the present invention can efficiently solve in existing power vehicle power supply system
Charge-discharge magnification is improved in the case that energy density, energy requirement etc. are constant；Comparing with traditional design can effectively reduce charge and discharge
Electric current is effectively reduced the fever due to caused by high current to the fever of high tension apparatus damage, reduction battery modules junction and changes
Problem in kind long-term existence mould group connection design；Solve the problems, such as the parallel connection instantaneous large-current ring current shock when used in parallel,
Keep battery system relatively reliable, and the service life of electrical part can be extended.
Detailed description of the invention
Fig. 1 is the schematic illustration that the present invention is implemented.
Specific embodiment
Present pre-ferred embodiments are provided with reference to the accompanying drawing, in order to explain the technical scheme of the invention in detail.
As shown in Figure 1, the present invention for the method for vehicle-mounted two sets battery systems parallel connection include total positive relay 1, always bear after
Electric appliance 3, battery management system (BATTERY MANAGEMENT SYSTEM, BMS) 4,24V power supply 5, first relay 6 in parallel,
Protective relay 7, second in parallel relay 8, preliminary filling resistance 9, the first battery system 10, the second battery system 11 in parallel, always just
Relay 1, battery management system 4, first relay 6 in parallel, the relay 8 in parallel of protective relay in parallel 7, second are in parallel, and
Connection protective relay 7 is connected with preliminary filling resistance 9, and the first relay 6 in parallel is connected with the first battery system 10, the second relay in parallel
Device 8 and the series connection of the second battery system 11, battery management system 4 are connected with 24V power supply 5, the first battery system 10 and the second battery
System 11 is used in parallel to power at least one electronic load 2, and total positive relay 1, electronic load 2, total negative relay 3 are successively gone here and there
Connection, when vehicle high-pressure system needs electric power, the relay 8 in parallel of closure second is closed protective relay 7 in parallel later；First
There can be pressure difference between battery system 10 and the second battery system 11, pressure difference can be calculated by battery management system 4, it is assumed that the
One battery system, 10 voltage is higher than 11 voltage of the second battery system, and 10 voltage of the first battery system is carried out to the second battery system 11
Precharge, when the pressure difference between the first battery system 10 and the second battery system 11 is less than the pressure difference of setting, closure first is simultaneously
Join relay 6, disconnects protective relay 7 in parallel, pre-charge process terminates.
First battery system 10 is with the second battery system 11 all by two groups of same sizes, the battery pack system string of identical quantity
Join, the first battery system, the second battery system draw electrode line and negative line, the first battery system, second outward respectively
Battery system presses 50%SOC (State of Charge, state-of-charge) capacity configuration.
Battery management system controls the switching of relay, the size of current that record current divider each stage changes over time, root
According to the preliminary filling resistance that drop stream length of time selection is suitable, and calculate the heating power of preliminary filling resistance.
Total positive relay 1, the phase is in an off state total negative relay 3 always before testing；Electronic load is tested in the later period
Middle use；24V power supply is in working condition always.
After the relay in parallel of battery management system closure second, logic control is carried out to protective relay in parallel.
Pre-charge process terminates to refer to that protective relay in parallel, the precharge of preliminary filling resistance terminate, and is clearly pre-charged in this way
Journey.
The effect that the present invention is flowed by the resistance drop in preliminary filling circuit, so that being unlikely to when two sets of battery system parallel connections due to returning
Road bus and battery system resistance itself are too small, form high current circulation and directly impacts so that battery core is impaired and electrical part damages,
Two sets of battery systems can be allow smoothly to carry out using the present invention used in parallel, solve the moment in parallel when used in parallel
High current ring current shock problem, keeps battery system relatively reliable, and can extend the service life of electrical part.
The present invention can be realized the characteristics of high voltage, monosystem low current, effectively improve at present since electric current leads to greatly temperature
Influence of the problem of liter to device.The present invention designs a kind of mode of two sets of battery system parallel connection load-sharings, every set system capacity
It can satisfy the requirement of overall system capacity 50%, if electric current output is constant when used in parallel, every set system need to only be exported originally
The fever due to caused by high current is effectively reduced to height with original design compared to can effectively reduce charging and discharging currents in 50% magnitude of current
Voltage device damage, the fever for reducing battery modules junction connect the problem on designing with long-term existence mould group is improved.It is more prominent
The advantages of solve the problems, such as instantaneous large-current ring current shock in parallel when being used in parallel.
Particular embodiments described above, the technical issues of to solution of the invention, technical scheme and beneficial effects carry out
It is further described, it should be understood that the above is only a specific embodiment of the present invention, is not limited to
The present invention, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should be included in this
Within the protection scope of invention.
Claims (3)
1. a kind of method for vehicle-mounted two sets of battery systems parallel connection, which is characterized in that it includes total positive relay, total negative relay
Device, battery management system, 24V power supply, the first parallel connection relay, protective relay in parallel, the second parallel connection relay, precharge
Resistance, the first battery system, the second battery system, total positive relay, battery management system, the first parallel connection relay, protection in parallel
Relay, the second relay in parallel are in parallel, and protective relay in parallel is connected with preliminary filling resistance, the first relay in parallel and the first electricity
Cell system series connection, the second relay and the second cell system in series, battery management system in parallel are connected with 24V power supply, the first electricity
Cell system and the second battery system is used in parallel powers at least one electronic load, total positive relay, electronic load, it is total it is negative after
Electric appliance is sequentially connected in series, and when vehicle high-pressure system needs electric power, the relay in parallel of closure second, closure is in parallel later protects relay
Device；There can be pressure difference between first battery system and the second battery system, pressure difference can be calculated by battery management system, it is assumed that
First cell system voltage is higher than the second cell system voltage, and the first cell system voltage carries out preliminary filling to the second battery system
Electricity, when the pressure difference between the first battery system and the second battery system is less than the pressure difference of setting, the relay in parallel of closure first,
Protective relay in parallel is disconnected, pre-charge process terminates；First battery system and the second battery system are all identical by two groups
Specification, identical quantity battery pack system be connected in series, the first battery system, the second battery system respectively outward draw electrode line
And negative line, the first battery system and the second battery system press 50%SOC capacity configuration.
2. being used for the method for vehicle-mounted two sets of battery systems parallel connection as described in claim 1, which is characterized in that the battery management
System controls the switching of relay, according to the preliminary filling resistance that drop stream length of time selection is suitable, and calculates the fever of preliminary filling resistance
Power.
3. being used for the method for vehicle-mounted two sets of battery systems parallel connection as described in claim 1, which is characterized in that the battery management
After the relay in parallel of system closure second, logic control is carried out to protective relay in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710380823.5A CN107146917B (en) | 2017-05-25 | 2017-05-25 | Method for vehicle-mounted two sets of battery systems parallel connection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710380823.5A CN107146917B (en) | 2017-05-25 | 2017-05-25 | Method for vehicle-mounted two sets of battery systems parallel connection |
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| Publication Number | Publication Date |
|---|---|
| CN107146917A CN107146917A (en) | 2017-09-08 |
| CN107146917B true CN107146917B (en) | 2019-10-15 |
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| CN201710380823.5A Expired - Fee Related CN107146917B (en) | 2017-05-25 | 2017-05-25 | Method for vehicle-mounted two sets of battery systems parallel connection |
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109509923A (en) * | 2017-09-14 | 2019-03-22 | 加百裕工业股份有限公司 | Battery parallel connection management method |
| CN107634559A (en) * | 2017-10-25 | 2018-01-26 | 上海伊控动力***有限公司 | A kind of echelon of new-energy automobile old and useless battery utilizes system and application method |
| CN108001259B (en) * | 2017-11-02 | 2021-04-02 | 合肥国轩高科动力能源有限公司 | Fault detection method for double-power system of electric automobile |
| CN107681758A (en) * | 2017-11-09 | 2018-02-09 | 中山大学 | Compound energy system |
| CN107706997A (en) * | 2017-11-09 | 2018-02-16 | 中山大学 | Intelligent equalization controller switching equipment, intelligent equalization distribution system and compound energy system |
| CN110224184A (en) * | 2018-03-01 | 2019-09-10 | 法法汽车(中国)有限公司 | Power battery, electric car and the control method to charge to the power battery |
| JP7068893B2 (en) * | 2018-03-30 | 2022-05-17 | 本田技研工業株式会社 | Vehicle power system |
| KR102530940B1 (en) * | 2018-04-23 | 2023-05-11 | 현대자동차주식회사 | Energy storage system for vehicle |
| CN109050275A (en) * | 2018-06-22 | 2018-12-21 | 北京长城华冠汽车科技股份有限公司 | A kind of grouping method and device of electric automobile battery box |
| CN109017402B (en) * | 2018-08-14 | 2020-12-04 | 爱驰汽车有限公司 | Double-battery power supply device for electric vehicle and control method |
| CN109980713B (en) * | 2018-12-21 | 2024-04-30 | 蔚来(安徽)控股有限公司 | Voltage conversion control device of power battery and control method thereof |
| CN113581009A (en) * | 2021-06-17 | 2021-11-02 | 东风汽车集团股份有限公司 | Battery module charging and discharging circuit of electric automobile and control method and device thereof |
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| EP0031225A1 (en) * | 1979-12-21 | 1981-07-01 | LUCAS INDUSTRIES public limited company | Battery charging system |
| EP1562252A1 (en) * | 2004-02-05 | 2005-08-10 | Ford Global Technologies, LLC, A subsidary of Ford Motor Company | Power supply system |
| CN104827986A (en) * | 2014-04-09 | 2015-08-12 | 北汽福田汽车股份有限公司 | Hybrid electric vehicle and switch protection device of high-voltage circuit thereof |
| CN106427619A (en) * | 2016-09-22 | 2017-02-22 | 奇瑞汽车股份有限公司 | Battery system, electrifying method and device |
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2017
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0031225A1 (en) * | 1979-12-21 | 1981-07-01 | LUCAS INDUSTRIES public limited company | Battery charging system |
| EP1562252A1 (en) * | 2004-02-05 | 2005-08-10 | Ford Global Technologies, LLC, A subsidary of Ford Motor Company | Power supply system |
| CN104827986A (en) * | 2014-04-09 | 2015-08-12 | 北汽福田汽车股份有限公司 | Hybrid electric vehicle and switch protection device of high-voltage circuit thereof |
| CN106427619A (en) * | 2016-09-22 | 2017-02-22 | 奇瑞汽车股份有限公司 | Battery system, electrifying method and device |
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| CN107146917A (en) | 2017-09-08 |
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