JP7445598B2 - 電源システム - Google Patents
電源システム Download PDFInfo
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- JP7445598B2 JP7445598B2 JP2020546211A JP2020546211A JP7445598B2 JP 7445598 B2 JP7445598 B2 JP 7445598B2 JP 2020546211 A JP2020546211 A JP 2020546211A JP 2020546211 A JP2020546211 A JP 2020546211A JP 7445598 B2 JP7445598 B2 JP 7445598B2
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- 238000007599 discharging Methods 0.000 claims description 57
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- 238000010586 diagram Methods 0.000 description 28
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- 238000000034 method Methods 0.000 description 20
- 230000008569 process Effects 0.000 description 18
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- 238000012986 modification Methods 0.000 description 7
- 230000001172 regenerating effect Effects 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- 230000007423 decrease Effects 0.000 description 6
- 230000008859 change Effects 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
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- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
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- 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
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- 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
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
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- B60L50/00—Electric propulsion with power supplied within the vehicle
- B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
- B60L50/60—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries
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- 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
- B60L58/12—Methods 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]
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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
- B60L58/12—Methods 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]
- B60L58/13—Maintaining the SoC within a determined range
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- 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
- B60L58/12—Methods 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]
- B60L58/14—Preventing excessive discharging
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- 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
- B60L58/12—Methods 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]
- B60L58/15—Preventing overcharging
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- 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
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- 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
- B60L58/22—Balancing the charge of battery modules
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- 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
- B60L7/00—Electrodynamic brake systems for vehicles in general
- B60L7/10—Dynamic electric regenerative braking
- B60L7/16—Dynamic electric regenerative braking for vehicles comprising converters between the power source and the motor
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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
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
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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
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/482—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for several batteries or cells simultaneously or sequentially
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- 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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
- H02J1/102—Parallel operation of dc sources being switching converters
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- 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
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
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- 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
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/00714—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current
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- 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
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1584—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel
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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
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
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- 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
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/20—Charging or discharging characterised by the power electronics converter
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
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- 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
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- 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
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- 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
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- 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
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- Y02T10/60—Other road transportation technologies with climate change mitigation effect
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- 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
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- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/92—Energy efficient charging or discharging systems for batteries, ultracapacitors, supercapacitors or double-layer capacitors specially adapted for vehicles
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- 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
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- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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- Power Engineering (AREA)
- Mechanical Engineering (AREA)
- Transportation (AREA)
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- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- General Chemical & Material Sciences (AREA)
- Electrochemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Description
本実施形態に係る電源システム10は、図1に示すように、複数のバッテリ12と、複数の電圧変換器14と、複数の1次側電流計測器16と、複数の1次側電圧計測器18と、2次側電流計測器20と、2次側電圧計測器22と、制御部24とを有する。電源システム10は、例えば、二輪車、四輪車等の電動車両の電源システムに適用される。また、複数の電圧変換器14、複数の1次側電流計測器16、複数の1次側電圧計測器18、2次側電流計測器20、2次側電圧計測器22、及び、制御部24等によって、複数のバッテリ12の電力を電動車両の駆動モータ等の負荷26に供給する一方で、後述する複数のバッテリ12の電圧又はSOCの均等化を図る電源供給ユニット28が構成される。
以上のように構成される電源システム10において、着脱式の複数のバッテリ12が電源供給ユニット28に接続され、且つ、負荷26が電源供給ユニット28に接続されている場合、複数の1次側電圧計測器18は、それぞれ、接続されているバッテリ12の電圧(1次側電圧)を計測し、その計測結果を制御部24に逐次送信する。また、複数の1次側電流計測器16は、それぞれ、1次側30を流れる電流(1次側電流)を計測し、その計測結果を制御部24に逐次送信する。なお、1次側電流計測器16は、バッテリ12の放電時には、バッテリ12から電圧変換器14に流れる電流(放電電流Id)を計測し、一方で、バッテリ12の充電時には、電圧変換器14からバッテリ12に流れ込む電流(充電電流Ic)を計測する。
図2は、図1の電源システム10の変形例である。図2の変形例では、1つのバッテリ12と、当該バッテリ12に接続される1つの電圧変換器14と、当該電圧変換器14の1次側30に接続される1次側電流計測器16及び1次側電圧計測器18とが、1つのバッテリユニット38として構成され、電源システム10に対して複数のバッテリユニット38を着脱可能とした点で、図1の構成とは異なる。なお、本実施形態では、複数のバッテリユニット38のうち、少なくとも1つのバッテリユニット38が電源システム10に対して着脱可能であればよい。
図3A~図3Cは、図1及び図2の電圧変換器14の具体例を示す回路図である。電圧変換器14は、例えば、昇圧型(図3A参照)、降圧型(図3B参照)、又は、インターリーブ回路方式の降圧型若しくは昇降圧型(図3C参照)のDC/DCコンバータである。これらのDC/DCコンバータの構成及び動作は、周知であるため、ここでは、図3A~図3Cの回路図における各構成要素の接続関係について簡単に説明する。
次に、本実施形態に係る電源システム10の特徴的な機能(以下、本実施形態の特徴的な機能ともいう。)について、図4A~図16を参照しながら説明する。本実施形態の特徴的な機能とは、電圧又はSOCの異なる複数のバッテリ12を互いに並列接続し、電圧又はSOCが互いに均等となるように複数のバッテリ12間に電流を流して充放電を行う場合に、バッテリ12の放電電流最大値Idmax(放電電流Idの絶対値の上限値)と充電電流最大値Icmax(充電電流Icの絶対値の上限値)との間の所定の許容範囲(第1範囲)内に当該電流が収まるように、複数の電圧変換器14の変圧率Trを設定するというものである。
図4Aは、電圧又はSOCの異なる複数のバッテリ12を互いに並列接続し、電圧又はSOCを互いに均等にする場合の問題点(比較例)を図示した概念図である。なお、比較例では、図1~図3C中の構成要素と同じ構成要素については、同じ参照符号を付けて説明する。
図4Bは、図4Aの問題点を解決するための本実施形態の特徴的な機能を図示した概念図である。
次に、本実施形態の特徴的な機能による複数のバッテリ12間の充放電の手法について、図5~図6Bを参照しながら説明する。
次に、本実施形態の特徴的な機能として、変圧率Trの変更により複数の電圧変換器14の2次側32の電圧差を調整することで、放電電流Id又は充電電流Icを調整する場合について、図7A~図9の説明図を参照しながら説明する。ここでは、一例として、複数の電圧変換器14が昇圧型のDC/DCコンバータ(図3A参照)である場合について説明する。
図4A~図9で説明した概念的な内容を、図1~図3Cの実際の回路構成で実現する場合について、図10A~図13を参照しながら説明する。なお、図10A~図11Bでは、説明の簡略化のため、図1及び図2の構成図について、2つのバッテリ12が電圧変換器14を介して2次側32で並列接続されている場合について説明する。
|Id|=|Ic|=|Vb1×Tru1-Vb2×Tru2|/r
(1)
次に、図1~図3Cの電源システム10での電圧又はSOCの均等化の具体的な動作について、図14~図16のフローチャートを参照しながら説明する。なお、図14~図16では、必要に応じて、図1~図13も参照しながら説明する。
Trd=(最も電圧の低いバッテリ12の電圧値)
/(電圧変換器14に接続されているバッテリ12の電圧値) (2)
Trd=(最も電圧の低いバッテリ12の電圧値)
/(自己のバッテリユニット38のバッテリ12の電圧値) (3)
Trd=(最も電圧の低いバッテリ12の電圧値)
/(電圧変換器14に接続されているバッテリ12の電圧値) (4)
以上説明したように、本実施形態に係る電源システム10は、充放電可能な複数のバッテリ12と、1次側30が複数のバッテリ12のいずれかに接続され、2次側32が互いに並列接続され、1次側30に接続されているバッテリ12の電圧を任意の変圧率Tr(昇圧率Tru、降圧率Trd)で変換し、変換した電圧を2次側32に出力する複数の電圧変換器14と、複数の電圧変換器14の1次側30に各々接続され、1次側30に流れる電流(放電電流Id、充電電流Ic)を計測する複数の1次側電流計測器16とを備える。
Claims (7)
- 充放電可能な複数のバッテリ(12)と、
1次側(30)が複数のバッテリのいずれかに接続され、2次側(32)が互いに並列接続され、前記1次側に接続されているバッテリの電圧を任意の変圧率(Tr、Tru、Trd)で変換し、変換した前記電圧を前記2次側に出力する複数の電圧変換器(14)と、
複数の前記電圧変換器の1次側に各々接続され、前記1次側に流れる電流(Id、Ic)を計測する複数の電流計測器(16)と、
を備える電源システム(10)において、
複数の前記電圧変換器の各々について、前記変圧率は、前記1次側に接続される電流計測器で計測される電流の絶対値が、前記1次側に接続されるバッテリの放電電流最大値(Idmax)以下、且つ、前記バッテリの充電電流最大値(Icmax)以下となる第1範囲内に収まるように設定され、
放電中の前記バッテリから流れる電流の絶対値が前記放電電流最大値を超える場合、充電中の前記バッテリに接続されている電圧変換器の変圧率を維持しつつ、放電中の前記バッテリに接続されている電圧変換器の変圧率を低下させ、
一方で、充電中の前記バッテリに流れ込む電流の絶対値が前記充電電流最大値を超える場合、放電中の前記バッテリに接続されている電圧変換器の変圧率を維持しつつ、充電中の前記バッテリに接続されている電圧変換器の変圧率を高くする、電源システム。 - 請求項1記載の電源システムにおいて、
複数の前記電圧変換器は、複数の前記バッテリの電圧又はSOCが第2範囲内に収まっている場合、変換動作を停止して、前記1次側と前記2次側とを導通させる、電源システム。 - 請求項2記載の電源システムにおいて、
複数の前記電圧変換器は、前記電源システムが動作を停止した場合、前記1次側と前記2次側との導通状態を解除する、電源システム。 - 請求項1~3のいずれか1項に記載の電源システムにおいて、
前記変圧率は、前記電流が略0となる初期値に予め設定されている、電源システム。 - 請求項1~4のいずれか1項に記載の電源システムにおいて、
複数の前記電圧変換器の1次側に各々接続され、前記1次側の電圧を計測する複数の1次側電圧計測器(18)と、
前記2次側に接続され、前記2次側の電圧を計測する2次側電圧計測器(22)と、
をさらに備える、電源システム。 - 請求項1~5のいずれか1項に記載の電源システムにおいて、
複数の前記バッテリのうち、少なくとも1つのバッテリは、前記電源システムに対して着脱可能である、電源システム。 - 請求項6記載の電源システムにおいて、
1つの前記バッテリと、当該バッテリに接続される前記電圧変換器と、当該電圧変換器の1次側に接続される前記電流計測器とを1つのユニットとする複数の前記ユニット(38)のうち、少なくとも1つのユニットは、前記電源システムに対して着脱可能である、電源システム。
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