JPWO2013031615A1 - Hybrid car battery system and hybrid car equipped with this battery system - Google Patents

Hybrid car battery system and hybrid car equipped with this battery system Download PDF

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JPWO2013031615A1
JPWO2013031615A1 JP2013531242A JP2013531242A JPWO2013031615A1 JP WO2013031615 A1 JPWO2013031615 A1 JP WO2013031615A1 JP 2013531242 A JP2013531242 A JP 2013531242A JP 2013531242 A JP2013531242 A JP 2013531242A JP WO2013031615 A1 JPWO2013031615 A1 JP WO2013031615A1
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battery
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temperature
electrical
charging current
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公彦 古川
公彦 古川
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Sanyo Electric Co Ltd
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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
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • 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
    • B60L3/0046—Detecting, 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
    • 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
    • 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
    • B60L50/61—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries by batteries charged by engine-driven generators, e.g. series hybrid electric vehicles
    • 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
    • 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
    • H01M10/486—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring temperature
    • 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
    • H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • H02J7/342—The other DC source being a battery actively interacting with the first one, i.e. battery to battery charging
    • 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
    • B60L2210/00—Converter types
    • B60L2210/10—DC to DC converters
    • B60L2210/12—Buck converters
    • 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
    • B60L2210/00—Converter types
    • B60L2210/40—DC to AC converters
    • 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
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/40—Drive Train control parameters
    • B60L2240/54—Drive Train control parameters related to batteries
    • B60L2240/545—Temperature
    • 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
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/40—Drive Train control parameters
    • B60L2240/54—Drive Train control parameters related to batteries
    • B60L2240/549—Current
    • 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
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/60—Navigation input
    • B60L2240/66—Ambient conditions
    • B60L2240/662—Temperature
    • 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
    • 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
    • Y02T10/62—Hybrid vehicles
    • 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
    • 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
    • Y02T10/72—Electric energy management in electromobility
    • 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
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/16—Information or communication technologies improving the operation of electric vehicles

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Sustainable Energy (AREA)
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  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Hybrid Electric Vehicles (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Secondary Cells (AREA)

Abstract

【課題】走行用バッテリで電装用バッテリを充電して、電装用バッテリの過放電状態における車両の走行を実現しながら、極低温状態における走行用バッテリの寿命低下を防止する。【解決手段】ハイブリッドカーのバッテリシステムは、車両を走行させるモータ１１に電力を供給する走行用バッテリ１と、この走行用バッテリ１の電圧を降圧するＤＣ／ＤＣコンバータ３と、このＤＣ／ＤＣコンバータ３で降圧された電圧で充電される電装用バッテリ２と、走行用バッテリ１による電装用バッテリ２の充電を制御するコントロール回路４と、走行用バッテリ１の温度又は周囲温度を検出する温度センサ５とを備えている。コントロール回路４は、走行用バッテリ１で電装用バッテリ２を充電する充電電流を、温度センサ５の検出温度が設定温度よりも低い状態において、設定温度よりも高い状態の充電電流よりも小さく制御している。【選択図】図１A battery for traveling is charged with a battery for traveling to realize traveling of the vehicle in an overdischarged state of the battery for electrical equipment, while preventing a decrease in the life of the traveling battery in an extremely low temperature state. A battery system for a hybrid car includes a traveling battery 1 that supplies electric power to a motor 11 that travels the vehicle, a DC / DC converter 3 that steps down the voltage of the traveling battery 1, and the DC / DC converter. 3, a control circuit 4 that controls charging of the electrical battery 2 by the traveling battery 1, and a temperature sensor 5 that detects the temperature or ambient temperature of the traveling battery 1. And. The control circuit 4 controls the charging current for charging the electrical battery 2 with the battery 1 for traveling when the temperature detected by the temperature sensor 5 is lower than the set temperature, and smaller than the charge current in the state higher than the set temperature. ing. [Selection] Figure 1

Description

本発明は、ハイブリッドカーに搭載されるバッテリシステムに関し、とくに、車両を走行させる高電圧の走行用バッテリでもって、低電圧の電装用バッテリを充電するハイブリッドカーのバッテリシステム及びこのバッテリシステムを備えるハイブリッドカーに関する。   The present invention relates to a battery system mounted on a hybrid car, and more particularly, a battery system for a hybrid car that charges a low-voltage electrical battery with a high-voltage traveling battery that travels the vehicle, and a hybrid including the battery system. Car related.

ハイブリッドカーのバッテリシステムは、車両を走行させるモータに電力を供給する高電圧の走行用バッテリと、低電圧の電装用バッテリとを備えている。走行用バッテリは、出力電圧を２００Ｖ〜３００Ｖとするニッケル水素電池、リチウムイオン電池、リチウムポリマー電池等が使用される。電装用バッテリには１２Ｖの鉛バッテリが使用される。電装用バッテリは、走行用バッテリの充電を制御する回路や車両の電装品に電力を供給する。   The battery system of a hybrid car includes a high-voltage traveling battery that supplies electric power to a motor that drives the vehicle, and a low-voltage electrical battery. A nickel-metal hydride battery, a lithium ion battery, a lithium polymer battery, or the like with an output voltage of 200 V to 300 V is used as the traveling battery. A 12V lead battery is used as the electrical battery. The battery for electrical equipment supplies power to a circuit for controlling charging of the battery for traveling and electrical equipment for the vehicle.

このバッテリシステムがハイブリッドカーに搭載されて、電装用バッテリをエンジンで回転される発電機で充電することなく、走行用バッテリの出力電圧を降圧して電装用バッテリを充電する方式が開発されている。（特許文献１参照）   A system has been developed in which this battery system is mounted on a hybrid car and the electric battery is charged by stepping down the output voltage of the traveling battery without charging the electric battery with a generator rotated by the engine. . (See Patent Document 1)

このバッテリシステムは、電装用バッテリの発電機に代わって、走行用バッテリの出力電圧を降圧するＤＣ／ＤＣコンバータを備えている。発電機に代わって電装用バッテリを充電するＤＣ／ＤＣコンバータは、電装用バッテリをより好ましい状態で充電できる。それは、ＤＣ／ＤＣコンバータを制御することで、電装用バッテリの充電電流を精密にコントロールできるからである。さらに、このバッテリシステムは、ハイブリッドカーに搭載されて、電装用バッテリの電力効率を高くできる特徴もある。それは、電装用バッテリの発電機が、ほとんどの状態において相当に軽い負荷で充電されて、総合的な発電効率が相当に低くなるのに対して、ＤＣ／ＤＣコンバータの電力変換効率が高く、また走行用バッテリの充電効率も高くできるからである。   This battery system includes a DC / DC converter that steps down the output voltage of the traveling battery, instead of the electric battery generator. A DC / DC converter that charges an electrical battery in place of the generator can charge the electrical battery in a more preferable state. This is because the charging current of the battery for electrical equipment can be precisely controlled by controlling the DC / DC converter. Furthermore, this battery system is mounted on a hybrid car and has a feature that the power efficiency of the battery for electrical equipment can be increased. This is because the power generation efficiency of the DC / DC converter is high, while the generator of the electrical battery is charged with a considerably light load in most states, and the overall power generation efficiency is considerably low. This is because the charging efficiency of the traveling battery can also be increased.

特開２０１０−３６５９４号公報JP 2010-36594 A

さらに、特許文献１のバッテリシステムは、車両を走行させない状態が続いて電装用バッテリが過放電された状態となっても、走行用バッテリで電装用バッテリを充電できる。このため、電装用バッテリが過放電された状態となっても、走行用バッテリで電装用バッテリを充電して、走行できる状態にできる。ハイブリッドカーは、走行用バッテリと電装用バッテリの何れかが過放電されると走行できなくなる。ハイブリッドカーのエンジンを始動できなくなるからである。ハイブリッドカーは、電装用バッテリが過放電されると、スタートさせるエンジンを回転できなくなるが、それは、電装用バッテリが過放電されると、スタートさせるための電気回路を動作できなくなるからである。このため、車両が相当に長い期間使用されない状態が続いて、電装用バッテリが過放電された状態になると、ハイブリッドカーにあっては、エンジンを始動できなくなるが、この状態において、走行用バッテリで電装用バッテリを充電することで、エンジンを始動して、走行できる状態にできる。   Furthermore, the battery system of Patent Document 1 can charge the electrical battery with the traveling battery even when the vehicle is not traveling and the electrical battery is overdischarged. For this reason, even if it becomes the state by which the battery for electrical equipment was over-discharged, the battery for electrical equipment can be charged with the battery for traveling, and it can be made into the state which can drive | work. The hybrid car cannot travel if either the traveling battery or the electrical battery is overdischarged. This is because the hybrid car engine cannot be started. The hybrid car cannot start the engine to be started if the electric battery is overdischarged, because the electric circuit for starting cannot be operated if the electric battery is overdischarged. For this reason, if the vehicle is not used for a considerable period of time and the electrical battery is overdischarged, the hybrid car cannot start the engine. By charging the battery for electrical equipment, the engine can be started and can be driven.

ところが、車両が極寒の地方で使用される状態において、走行用バッテリで電装用バッテリを充電すると、走行用バッテリの放電特性が低下する状態で電装用バッテリを充電することになって、走行用バッテリの寿命を著しく低下させる原因となる。とくに、リチウムイオン電池やリチウムポリマー電池は極低温において放電特性が相当に低下することから、この傾向が甚だしくなる欠点がある。この欠点は、極低温の状態においては、走行用バッテリによる電装用バッテリの充電を禁止して解消できる。しかしながら、走行用バッテリによる電装用バッテリの充電を禁止すると、電装用バッテリが過放電された状態になると、エンジンが始動できなかったり、走行用バッテリの充放電をコントロールできなくなって、車両を全く使用できなくなる欠点がある。   However, in a state where the vehicle is used in an extremely cold region, when the electrical battery is charged with the traveling battery, the electrical battery is charged in a state where the discharge characteristics of the traveling battery are deteriorated. Cause a significant decrease in the lifespan of the product. In particular, lithium ion batteries and lithium polymer batteries have a drawback that this tendency becomes significant because the discharge characteristics are considerably lowered at extremely low temperatures. This drawback can be solved by prohibiting charging of the battery for electrical equipment by the battery for traveling in the extremely low temperature state. However, if charging of the battery for electrical equipment by the battery for traveling is prohibited, if the battery for electrical equipment is over-discharged, the engine cannot be started or charging / discharging of the battery for traveling cannot be controlled, and the vehicle is not used at all. There is a drawback that can not be done.

本発明は、この欠点を解決することを目的に開発されたものである。本発明の重要な目的は、走行用バッテリで電装用バッテリを充電して、電装用バッテリの過放電状態における車両の走行を実現しながら、極低温状態における走行用バッテリの寿命低下を防止できるハイブリッドカーのバッテリシステムとこのバッテリシステムを備えるハイブリッドカーを提供することにある。   The present invention has been developed for the purpose of solving this drawback. An important object of the present invention is to provide a hybrid capable of charging a battery for electrical equipment with a battery for traveling and realizing traveling of the vehicle in an overdischarged state of the battery for electrical equipment while preventing a decrease in the life of the battery for traveling in an extremely low temperature state. The object is to provide a car battery system and a hybrid car including the battery system.

課題を解決するための手段及び発明の効果Means for Solving the Problems and Effects of the Invention

本発明のハイブリッドカーのバッテリシステムは、車両を走行させるモータに電力を供給する走行用バッテリと、この走行用バッテリの電圧を降圧するＤＣ／ＤＣコンバータと、このＤＣ／ＤＣコンバータで降圧された電圧で充電される電装用バッテリと、走行用バッテリによる電装用バッテリの充電を制御するコントロール回路と、走行用バッテリの温度又は周囲温度を検出する温度センサとを備えている。コントロール回路は、走行用バッテリで電装用バッテリを充電する充電電流を、温度センサの検出温度が設定温度よりも低い状態において、設定温度よりも高い状態の充電電流よりも小さく制御している。   A battery system for a hybrid car according to the present invention includes a traveling battery that supplies power to a motor that travels a vehicle, a DC / DC converter that steps down the voltage of the traveling battery, and a voltage that is stepped down by the DC / DC converter. And a control circuit for controlling charging of the battery for electrical equipment by the battery for traveling, and a temperature sensor for detecting the temperature or ambient temperature of the battery for traveling. The control circuit controls the charging current for charging the electrical battery with the traveling battery to be smaller than the charging current in a state where the temperature detected by the temperature sensor is lower than the set temperature.

以上のバッテリシステムは、走行用バッテリで電装用バッテリを充電することで、電装用バッテリの過放電状態における車両の走行を実現しながら、極低温状態における走行用バッテリの寿命低下を防止できる特徴がある。それは、走行用バッテリの電気特性が低下する低温状態で、走行用バッテリで電装用バッテリを充電する電流を小さくして、走行用バッテリの放電電流を小さく制限するからである。   The battery system described above is characterized by charging the electrical battery with the traveling battery to prevent the traveling battery from deteriorating in an extremely low temperature state while realizing the traveling of the vehicle in the overdischarged state of the electrical battery. is there. This is because, in a low temperature state where the electric characteristics of the traveling battery deteriorate, the current for charging the electrical battery with the traveling battery is reduced, and the discharge current of the traveling battery is limited to be small.

本発明のハイブリッドカーのバッテリシステムは、走行用バッテリを、リチウムイオン電池又はリチウムポリマー電池とすることができる。
以上のバッテリシステムは、走行用バッテリをリチウムイオン電池やリチウムポリマー電池とすることで、重量に対する充放電容量を大きくしながら、これ等の走行用バッテリの低温における電気特性の低下を有効に防止できる。In the battery system of the hybrid car of the present invention, the traveling battery can be a lithium ion battery or a lithium polymer battery.
The above battery system can effectively prevent a decrease in electrical characteristics at low temperatures of these traveling batteries while increasing the charge / discharge capacity with respect to weight by using the traveling battery as a lithium ion battery or a lithium polymer battery. .

本発明のハイブリッドカーのバッテリシステムは、コントロール回路が、走行用バッテリによる電装用バッテリの充電電流を減少させる設定温度を記憶し、この設定温度を−１０℃ないし−３５℃とすることができる。
以上のバッテリシステムは、−１０℃ないし−３５℃と極低温における走行用バッテリの劣化を防止しながら、走行用バッテリで電装用バッテリを充電できる特徴がある。In the battery system of the hybrid car of the present invention, the control circuit stores a set temperature for reducing the charging current of the electric battery by the traveling battery, and the set temperature can be set to −10 ° C. to −35 ° C.
The battery system described above is characterized in that the battery for electrical equipment can be charged with the battery for traveling while preventing deterioration of the battery for traveling at an extremely low temperature of -10 ° C to -35 ° C.

本発明のハイブリッドカーのバッテリシステムは、コントロール回路が、温度センサの検出温度が設定温度よりも低温状態と、検出温度が設定温度よりも常温状態における電装用バッテリの充電電流を記憶し、低温状態における電装用バッテリの充電電流を、常温状態の充電電流の１／１０ないし１／２とすることができる。
以上のバッテリシステムは、低温状態における電装用バッテリの充電電流を制限することで、走行用バッテリの放電電流を１／１０〜１／２と相当に小さくするので、走行用バッテリの低温状態における劣化を防止しながら、走行用バッテリで電装用バッテリを充電できる。In the battery system of the hybrid car of the present invention, the control circuit stores the charging current of the battery for electrical equipment when the detected temperature of the temperature sensor is lower than the set temperature and when the detected temperature is normal temperature than the set temperature. The charging current of the electrical battery in can be set to 1/10 to 1/2 of the charging current at room temperature.
The battery system described above limits the charging current of the battery for electrical equipment in a low temperature state, so that the discharge current of the battery for traveling is considerably reduced to 1/10 to 1/2. The battery for electrical equipment can be charged with the battery for traveling while preventing the above.

本発明のハイブリッドカーのバッテリシステムは、コントロール回路が、温度センサの検出温度に対する電装用バッテリの充電電流をルックアップテーブルとして記憶し、ルックアップテーブルに記憶される検出温度に対応して電装用バッテリの充電電流をコントロールすることができる。
以上のバッテリシステムは、コントロール回路に記憶されるルックアップテーブルにしたがって、検出温度に対する電装用バッテリの充電電流を制限するので、低温状態において電装用バッテリの充電電流、すなわち走行用バッテリの放電電流を正確にコントロールして、走行用バッテリの劣化を有効に防止できる。In the battery system of the hybrid car of the present invention, the control circuit stores the charging current of the electric battery with respect to the detected temperature of the temperature sensor as a lookup table, and the electric battery is corresponding to the detected temperature stored in the lookup table. The charging current can be controlled.
The above battery system limits the charging current of the electric battery with respect to the detected temperature in accordance with the lookup table stored in the control circuit, so the charging current of the electric battery, that is, the discharging current of the traveling battery is reduced at low temperatures. Accurate control can effectively prevent deterioration of the battery for traveling.

本発明のハイブリッドカーのバッテリシステムは、コントロール回路が、温度センサの検出温度に対する電装用バッテリの充電電流を関数として記憶し、記憶される関数に基づいて電装用バッテリの充電電流をコントロールすることができる。
以上のバッテリシステムは、コントロール回路に記憶される関数に基づいて、検出温度に対する電装用バッテリの充電電流を制限するので、低温状態において電装用バッテリの充電電流、すなわち走行用バッテリの放電電流を正確にコントロールして、走行用バッテリの劣化を有効に防止できる。In the battery system of the hybrid car of the present invention, the control circuit stores the charging current of the electric battery with respect to the temperature detected by the temperature sensor as a function, and controls the charging current of the electric battery based on the stored function. it can.
The above battery system limits the charging current of the electric battery with respect to the detected temperature based on the function stored in the control circuit, so that the charging current of the electric battery, that is, the discharging current of the traveling battery can be accurately measured in a low temperature state. It is possible to effectively prevent deterioration of the traveling battery.

本発明のハイブリッドカーのバッテリシステムは、コントロール回路が、走行用バッテリの放電電流をコントロールして、電装用バッテリの充電電流を制御することができる。
以上のバッテリシステムは、走行用バッテリの放電電流をコントロールして、電装用バッテリの充電電流をコントロールするので、低温状態においては、走行用バッテリを有効に保護して電装用バッテリを充電できる。このため、低温状態における走行用バッテリの劣化を有効に防止しながら、これで電装用バッテリを充電できる。In the battery system of the hybrid car of the present invention, the control circuit can control the charging current of the battery for electrical equipment by controlling the discharging current of the battery for traveling.
Since the above battery system controls the discharge current of the battery for traveling and controls the charging current of the battery for electrical equipment, the battery for electrical equipment can be charged while effectively protecting the battery for traveling in a low temperature state. For this reason, the battery for electrical equipment can be charged with this while effectively preventing deterioration of the battery for traveling in a low temperature state.

本発明のハイブリッドカーは、上記のいずれかのバッテリシステムを備えることができる。   The hybrid car of the present invention can include any one of the battery systems described above.

本発明の一実施例にかかるバッテリシステムのブロック図である。It is a block diagram of the battery system concerning one Example of this invention. 図１に示すバッテリシステムを搭載するハイブリッド自動車の一例を示すブロック図である。It is a block diagram which shows an example of the hybrid vehicle carrying the battery system shown in FIG.

以下、本発明の実施例を図面に基づいて説明する。ただし、以下に示す実施例は、本発明の技術思想を具体化するためのハイブリッドカーのバッテリシステム及びこのバッテリシステムを備えるハイブリッドカーを例示するものであって、本発明はバッテリシステムとハイブリッドカーを以下のものに特定しない。さらに、この明細書は、特許請求の範囲を理解しやすいように、実施例に示される部材に対応する番号を、「特許請求の範囲」および「課題を解決するための手段の欄」に示される部材に付記している。ただ、特許請求の範囲に示される部材を、実施例の部材に特定するものでは決してない。   Embodiments of the present invention will be described below with reference to the drawings. However, the embodiment described below exemplifies a hybrid car battery system for embodying the technical idea of the present invention and a hybrid car including the battery system. The present invention includes a battery system and a hybrid car. Not specified below. Further, in this specification, in order to facilitate understanding of the scope of claims, numbers corresponding to the members shown in the examples are indicated in the “claims” and “means for solving problems” sections. It is added to the members. However, the members shown in the claims are not limited to the members in the embodiments.

本発明のバッテリシステムは、ハイブリッドカーに搭載される。このバッテリシステムは、車両を走行させるモータ１１に電力を供給する走行用バッテリ１と、走行用バッテリ１の電圧を降圧するＤＣ／ＤＣコンバータ３と、このＤＣ／ＤＣコンバータ３で降圧された電圧で充電される電装用バッテリ２と、走行用バッテリ１による電装用バッテリ２の充電を制御するコントロール回路４と、走行用バッテリ１の温度又は周囲温度を検出する温度センサ５とを備える。   The battery system of the present invention is mounted on a hybrid car. This battery system includes a traveling battery 1 that supplies electric power to a motor 11 that travels a vehicle, a DC / DC converter 3 that steps down the voltage of the traveling battery 1, and a voltage that is stepped down by the DC / DC converter 3. An electric battery 2 to be charged, a control circuit 4 that controls charging of the electric battery 2 by the traveling battery 1, and a temperature sensor 5 that detects the temperature or ambient temperature of the traveling battery 1 are provided.

図１に示すように、ハイブリッドカーは、エンジン１３で駆動され、さらに、回生制動で駆動される発電機１２を備えており、この発電機１２で走行用バッテリ１を充電する。   As shown in FIG. 1, the hybrid car includes a generator 12 that is driven by an engine 13 and that is further driven by regenerative braking. The generator 12 charges the traveling battery 1.

走行用バッテリ１は、１００Ｖ〜３００Ｖの高電圧バッテリで、リチウムイオン電池、リチウムポリマー電池、ニッケル水素電池などの充電できる複数の二次電池６を直列に接続して出力電圧を高くしている。さらに、走行用バッテリは、複数の二次電池を並列して容量を大きくすることもできる。走行用バッテリ１は、ＤＣ／ＡＣインバータ１０を介して車両を走行させるモータ１１に電力を供給する。ＤＣ／ＡＣインバータ１０は、コントロールユニット１４に制御されて、モータ１１に供給する電力、すなわち走行用バッテリ１の放電電流をコントロールして、車両を走行させる。コントロールユニット１４は、アクセル、ブレーキなどの入力される情報でＤＣ／ＡＣインバータ１０を制御して、走行用バッテリ１からモータ１１に供給する電力をコントロールする。   The traveling battery 1 is a high voltage battery of 100 V to 300 V, and a plurality of rechargeable secondary batteries 6 such as lithium ion batteries, lithium polymer batteries, and nickel hydride batteries are connected in series to increase the output voltage. Further, the traveling battery can be increased in capacity by paralleling a plurality of secondary batteries. The traveling battery 1 supplies electric power to a motor 11 that causes the vehicle to travel through a DC / AC inverter 10. The DC / AC inverter 10 is controlled by the control unit 14 to control the electric power supplied to the motor 11, that is, the discharge current of the traveling battery 1, thereby causing the vehicle to travel. The control unit 14 controls the DC / AC inverter 10 based on input information such as an accelerator and a brake, and controls the power supplied from the traveling battery 1 to the motor 11.

さらに、ハイブリッドカーに搭載される走行用バッテリ１は、車両を走行させるエンジン１３、あるいは充電専用のエンジン１３に駆動される発電機１２で充電される。コントロールユニット１４は、走行用バッテリ１の充電と放電をコントロールして、所定の残容量、たとえば、５０±２０％の範囲に保持される。   Furthermore, the battery 1 for driving | running | working mounted in a hybrid car is charged with the generator 12 driven by the engine 13 which drives a vehicle, or the engine 13 only for charge. The control unit 14 controls the charging and discharging of the traveling battery 1 and is held within a predetermined remaining capacity, for example, in the range of 50 ± 20%.

電装用バッテリ２は１２Ｖの鉛バッテリで、車両に搭載している電装品に電力を供給し、さらに、走行用バッテリ１の充放電をコントロールするコントロールユニット１４やコントロール回路４の電源回路に電力を供給する。   The electric battery 2 is a 12V lead battery that supplies electric power to electric components mounted on the vehicle, and further supplies electric power to the control unit 14 that controls charging / discharging of the traveling battery 1 and the power circuit of the control circuit 4. Supply.

ＤＣ／ＤＣコンバータ３は、走行用バッテリ１の直流電圧を、電装用バッテリ２を充電する電圧に降圧して、走行用バッテリ１で電装用バッテリ２を充電する。コントロール回路４は、ＤＣ／ＤＣコンバータ３の出力をコントロールして、電装用バッテリ２を一定の電圧範囲に保持する。ただし、コントロール回路４は、車両を走行させるときにオンに切り換えられるメインスイッチ、すなわちイグニッションスイッチ１５をオンとする状態で、電装用バッテリ２の電圧を一定の電圧範囲に保持する。したがって、コントロール回路４は、電装用バッテリ２の電圧を検出する電圧検出回路（図示せず）を備えている。このコントロール回路４は、電圧検出回路で検出される電装用バッテリ２の検出電圧を一定の電圧範囲とするようにＤＣ／ＤＣコンバータ３を制御して、走行用バッテリ１で電装用バッテリ２を充電する。電装用バッテリ２は放電されると電圧が低下するので、充電して電圧を上昇させて、一定の電圧範囲に制御する。コントロール回路４は、ＤＣ／ＤＣコンバータ３を制御して、走行用バッテリ１で電装用バッテリ２を充電する充電電流をコントロールして、電装用バッテリ２を一定の電圧範囲に保持する。   The DC / DC converter 3 steps down the DC voltage of the traveling battery 1 to a voltage that charges the electrical battery 2 and charges the electrical battery 2 with the traveling battery 1. The control circuit 4 controls the output of the DC / DC converter 3 to keep the electrical battery 2 in a certain voltage range. However, the control circuit 4 keeps the voltage of the electrical battery 2 in a certain voltage range in a state where the main switch that is turned on when the vehicle is running, that is, the ignition switch 15 is turned on. Therefore, the control circuit 4 includes a voltage detection circuit (not shown) that detects the voltage of the electrical equipment battery 2. The control circuit 4 controls the DC / DC converter 3 so that the detection voltage of the electrical equipment battery 2 detected by the voltage detection circuit is in a certain voltage range, and charges the electrical equipment battery 2 with the traveling battery 1. To do. When the battery 2 for electrical equipment is discharged, the voltage drops. Therefore, the battery 2 is charged to increase the voltage and is controlled within a certain voltage range. The control circuit 4 controls the DC / DC converter 3 to control the charging current for charging the electrical battery 2 with the traveling battery 1 to keep the electrical battery 2 in a certain voltage range.

さらに、コントロール回路４は、車両に搭載しているコントロールユニット１４からの信号でＤＣ／ＤＣコンバータ３をコントロールして、電装用バッテリ２を一定の電圧範囲とすることもできる。このコントロール回路４は、たとえば、車両のブレーキが踏まれて回生制動されるときに、走行用バッテリ１で電装用バッテリ２を充電する。   Furthermore, the control circuit 4 can also control the DC / DC converter 3 with a signal from the control unit 14 mounted on the vehicle, so that the electrical battery 2 can be in a certain voltage range. The control circuit 4 charges the electrical battery 2 with the traveling battery 1 when, for example, the brake of the vehicle is depressed and regenerative braking is performed.

コントロール回路４は、走行用バッテリ１の温度や周囲温度によっても、走行用バッテリ１で電装用バッテリ２を充電する電流をコントロールする。このことを実現するために、走行用バッテリ１の温度、又は周囲温度を検出する温度センサ５を備えている。温度センサ５は、好ましくは走行用バッテリ１の温度を検出する。ただ、周囲温度が低下しても走行用バッテリ１の温度が低下するので、周囲温度を検出して走行用バッテリ１の充電電流をコントロールすることもできる。   The control circuit 4 also controls the current for charging the electrical battery 2 with the traveling battery 1 depending on the temperature of the traveling battery 1 and the ambient temperature. In order to realize this, a temperature sensor 5 for detecting the temperature of the traveling battery 1 or the ambient temperature is provided. The temperature sensor 5 preferably detects the temperature of the traveling battery 1. However, even if the ambient temperature decreases, the temperature of the traveling battery 1 decreases, so that the ambient temperature can be detected to control the charging current of the traveling battery 1.

コントロール回路４は、温度センサ５の検出温度によって、走行用バッテリ１で電装用バッテリ２を充電する充電電流、すなわち、走行用バッテリ１の放電電流を制御する。このコントロール回路４は、温度センサ５の検出温度が設定温度よりも低い状態において、設定温度よりも高い状態よりも電装用バッテリ２の充電電流を小さく制限する。温度が低い状態で電気特性が低下している走行用バッテリ１を保護するためである。   The control circuit 4 controls the charging current for charging the electrical battery 2 with the traveling battery 1, that is, the discharging current of the traveling battery 1, according to the temperature detected by the temperature sensor 5. The control circuit 4 limits the charging current of the electrical battery 2 to be smaller in a state where the temperature detected by the temperature sensor 5 is lower than the set temperature than in a state where the temperature is higher than the set temperature. This is to protect the traveling battery 1 whose electrical characteristics are degraded in a low temperature state.

コントロール回路４は、設定温度の上下で走行用バッテリ１で電装用バッテリ２を充電する充電電流を切り換えて、たとえば、検出温度が設定温度よりも低い状態において走行用バッテリ１で電装用バッテリ２を充電する充電電流を、設定温度よりも高い状態の充電電流よりも小さくするように制限する。このコントロール回路４は、たとえば、設定温度を−３０℃として、検出温度がこの設定温度よりも低い低温状態で、走行用バッテリ１による電装用バッテリ２の充電電流を、検出温度が設定温度よりも高い常温状態の充電電流よりも小さくする。常温状態における電装用バッテリ２の充電電流は、大きくして速やかに電装用バッテリ２を充電でき、低温状態における電装用バッテリ２の充電電流は、小さくして低温状態における走行用バッテリ１の劣化を少なくできる。したがって、低温状態における電装用バッテリ２の充電電流は、走行用バッテリ１の劣化を防止しながら電装用バッテリ２をできるかぎり速やかに充電できるように、好ましくは、常温状態における充電電流の１／１０〜１／２とする。   The control circuit 4 switches the charging current for charging the electrical battery 2 with the traveling battery 1 above and below the set temperature. For example, when the detected temperature is lower than the set temperature, the control circuit 4 sets the electrical battery 2 with the traveling battery 1. The charging current to be charged is limited to be smaller than the charging current in a state higher than the set temperature. For example, the control circuit 4 sets the set temperature to −30 ° C., and detects the charging current of the electric battery 2 by the traveling battery 1 in a low temperature state where the detected temperature is lower than the set temperature. Make it smaller than the charging current at high room temperature. The charging current of the electrical battery 2 in the normal temperature state can be increased to quickly charge the electrical battery 2, and the charging current of the electrical battery 2 in the low temperature state can be reduced to reduce the deterioration of the traveling battery 1 in the low temperature state. Less. Therefore, the charging current of the electrical battery 2 in the low temperature state is preferably 1/10 of the charging current in the normal temperature state so that the electrical battery 2 can be charged as quickly as possible while preventing the traveling battery 1 from deteriorating. ˜½.

コントロール回路４は、走行用バッテリ１で電装用バッテリ２を充電する充電電流を、走行用バッテリ１の電圧によって変化させることもできる。たとえば、走行用バッテリ１の電圧が低い状態での充電電流を、電圧が高い状態での充電電流よりも小さくすることができる。この場合、コントロール回路４は、電池の電圧が低い状態における充電電流の最大値を、検出温度で特定される充電電流よりも小さく制限する。電圧が低下して電気特性の低下した走行用バッテリ１の劣化を防止するためである。   The control circuit 4 can also change the charging current for charging the electrical battery 2 with the traveling battery 1 according to the voltage of the traveling battery 1. For example, the charging current when the voltage of the traveling battery 1 is low can be made smaller than the charging current when the voltage is high. In this case, the control circuit 4 limits the maximum value of the charging current when the battery voltage is low to be smaller than the charging current specified by the detected temperature. This is for preventing the deterioration of the traveling battery 1 whose voltage is lowered and the electrical characteristics are lowered.

以上のように電装用バッテリ２の充電電流を検出温度で設定するコントロール回路４は、最も簡単に充電電流を制御できる。だたし、コントロール回路４は複数の設定温度を記憶し、設定温度の上下で充電電流を変化させることで、検出温度が低い状態で走行用バッテリ１による電装用バッテリ２の充電電流を小さくすることもできる。   As described above, the control circuit 4 that sets the charging current of the electrical equipment battery 2 based on the detected temperature can most easily control the charging current. However, the control circuit 4 stores a plurality of set temperatures, and changes the charging current above and below the set temperatures, thereby reducing the charging current of the electrical battery 2 by the traveling battery 1 with the detected temperature being low. You can also.

コントロール回路４は、以上のように検出温度で電装用バッテリ２の充電電流をコントロールするために、温度センサ５の検出温度に対する電装用バッテリ２の充電電流をルックアップテーブルとして記憶し、あるいは関数として記憶している。このコントロール回路４は、ルックアップテーブルに記憶され、あるいは関数として記憶している検出温度に対応して電装用バッテリ２の充電電流をコントロールする。   In order to control the charging current of the electrical battery 2 at the detected temperature as described above, the control circuit 4 stores the charging current of the electrical battery 2 with respect to the detected temperature of the temperature sensor 5 as a lookup table or as a function. I remember it. The control circuit 4 controls the charging current of the electrical battery 2 corresponding to the detected temperature stored in the lookup table or stored as a function.

車両に搭載されるバッテリシステムは、車両のメインスイッチであるイグニッションスイッチ１５がオンに切り換えられている状態で、走行用バッテリ１で電装用バッテリ２を充電して、電装用バッテリ２を一定の電圧範囲に保持する。電装用バッテリ２は、イグニッションスイッチ１５がオンに切り換えられて、走行用バッテリ１で充電できる状態で一定の電圧範囲に保持される。イグニッションスイッチ１５をオフに切り換えて、車両を走行させない状態で、電装用バッテリ２は走行用バッテリ１で充電されなくなる。したがって、イグニッションスイッチ１５をオフに切り換えた後における電装用バッテリ２の電圧は、イグニッションスイッチ１５をオンに切り換えている状態よりも低くなる。イグニッションスイッチ１５をオフとする状態、すなわち車両が使用されない状態において、電装用バッテリ２の電圧は、自己放電によって、さらに、車両に搭載している電装機器が消費しているわずかな電力消費によって次第に低下する。したがって、車両が長期間使用されず、さらに電装用バッテリ２が充分に充電されていない状態で、あるいは又、電装用バッテリ２が劣化して充電容量が低下している状態においては、イグニッションスイッチ１５をオンに切り換えた直後で電装用バッテリ２の電圧が相当に低下している。イグニッションスイッチ１５をオンに切り換えた状態で、電装用バッテリ２が過放電された状態となって、コントロールユニット１４などの電源に電力供給できない状態にあると、車両を走行できなくなるので、コントロール回路４は、走行用バッテリ１で電装用バッテリ２を充電する。このとき、温度センサ５の検出温度が設定温度よりも高い状態にあると、コントロール回路４は常温状態と判定して、走行用バッテリ１で電装用バッテリ２を所定の電流で充電する。しかしながら、検出温度が設定温度よりも低い状態にあると、コントロール回路４は走行用バッテリ１による電装用バッテリ２の充電電流を小さく制限して、走行用バッテリ１の劣化を防止する。低温で電気特性の低下している走行用バッテリ１を保護しながら、電装用バッテリ２を充電するためである。走行用バッテリ１で電装用バッテリ２が充電されると、電装用バッテリ２からコントロールユニット１４の電源に電力を供給できる状態となって、走行用バッテリ１でエンジン１３を始動できる状態となる。エンジン１３を始動して、走行用バッテリ１が充電される状態になると、走行用バッテリ１は発電機１２で充電される状態となり、この状態の走行用バッテリ１で電装用バッテリ２も充電されて一定の電圧範囲に保持される。   A battery system mounted on a vehicle charges the electrical battery 2 with the traveling battery 1 in a state where the ignition switch 15 that is the main switch of the vehicle is turned on, and the electrical battery 2 is kept at a constant voltage. Keep in range. The electrical battery 2 is held in a certain voltage range in a state where the ignition switch 15 is turned on and the battery 1 can be charged. When the ignition switch 15 is switched off and the vehicle is not traveling, the electrical battery 2 is no longer charged by the traveling battery 1. Accordingly, the voltage of the electrical battery 2 after the ignition switch 15 is switched off is lower than in the state where the ignition switch 15 is switched on. In a state where the ignition switch 15 is turned off, that is, in a state where the vehicle is not used, the voltage of the electrical battery 2 is gradually increased by self-discharge and further by a slight power consumption consumed by the electrical equipment mounted on the vehicle. descend. Therefore, when the vehicle is not used for a long time and the electric battery 2 is not sufficiently charged, or when the electric battery 2 is deteriorated and the charging capacity is reduced, the ignition switch 15 Immediately after the switch is turned on, the voltage of the electrical equipment battery 2 is considerably reduced. When the ignition switch 15 is turned on, the electric battery 2 is over-discharged, and if the power cannot be supplied to the power source of the control unit 14 or the like, the vehicle cannot run, so the control circuit 4 Charges the electrical battery 2 with the traveling battery 1. At this time, if the temperature detected by the temperature sensor 5 is higher than the set temperature, the control circuit 4 determines that the temperature is normal and charges the electrical battery 2 with the traveling battery 1 with a predetermined current. However, when the detected temperature is lower than the set temperature, the control circuit 4 limits the charging current of the electrical battery 2 by the traveling battery 1 to prevent the traveling battery 1 from deteriorating. This is for charging the battery 2 for electrical equipment while protecting the battery 1 for traveling whose electrical characteristics are lowered at low temperatures. When the electric battery 2 is charged by the traveling battery 1, power can be supplied from the electric battery 2 to the power source of the control unit 14, and the engine 13 can be started by the traveling battery 1. When the engine 13 is started and the traveling battery 1 is charged, the traveling battery 1 is charged by the generator 12, and the electrical battery 2 is also charged by the traveling battery 1 in this state. It is held in a certain voltage range.

以上のバッテリシステムは、エンジンとモータの両方で走行するハイブリッド自動車用の電源として利用できる。図２は、ハイブリッド自動車にバッテリシステム１００を搭載する例を示す。この図に示すバッテリシステム１００を搭載した車両ＨＶは、車両ＨＶを走行させるエンジン１３及び走行用のモータ１１と、モータ１１に電力を供給するバッテリシステム１００と、バッテリシステム１００の電池を充電する発電機１２とを備えている。バッテリシステム１００は、ＤＣ／ＡＣインバータ１０を介してモータ１１と発電機１２に接続している。車両ＨＶは、バッテリシステム１００の電池を充放電しながらモータ１１とエンジン１３の両方で走行する。モータ１１は、エンジン効率の悪い領域、たとえば加速時や低速走行時に駆動されて車両を走行させる。モータ１１は、バッテリシステム１００から電力が供給されて駆動する。発電機１２は、エンジン１３で駆動され、あるいは車両にブレーキをかけるときの回生制動で駆動されて、バッテリシステム１００の電池を充電する。   The above battery system can be used as a power source for a hybrid vehicle that runs on both the engine and the motor. FIG. 2 shows an example in which the battery system 100 is mounted on a hybrid vehicle. A vehicle HV equipped with the battery system 100 shown in this figure includes an engine 13 for traveling the vehicle HV, a motor 11 for traveling, a battery system 100 for supplying electric power to the motor 11, and power generation for charging a battery of the battery system 100. Machine 12. The battery system 100 is connected to a motor 11 and a generator 12 via a DC / AC inverter 10. The vehicle HV travels by both the motor 11 and the engine 13 while charging / discharging the battery of the battery system 100. The motor 11 is driven to drive the vehicle when the engine efficiency is low, for example, when accelerating or traveling at a low speed. The motor 11 is driven by power supplied from the battery system 100. The generator 12 is driven by the engine 13 or driven by regenerative braking when braking the vehicle, and charges the battery of the battery system 100.

１００…バッテリシステム
１…走行用バッテリ
２…電装用バッテリ
３…ＤＣ／ＤＣコンバータ
４…コントロール回路
５…温度センサ
６…二次電池
１０…ＤＣ／ＡＣインバータ
１１…モータ
１２…発電機
１３…エンジン
１４…コントロールユニット
１５…イグニッションスイッチ
ＨＶ…車両DESCRIPTION OF SYMBOLS 100 ... Battery system 1 ... Battery for driving | running | working 2 ... Battery for electrical equipment 3 ... DC / DC converter 4 ... Control circuit 5 ... Temperature sensor 6 ... Secondary battery 10 ... DC / AC inverter 11 ... Motor 12 ... Generator 13 ... Engine 14 ... Control unit 15 ... Ignition switch HV ... Vehicle

Claims (8)

車両を走行させるモータに電力を供給する走行用バッテリと、この走行用バッテリの電圧を降圧するＤＣ／ＤＣコンバータと、このＤＣ／ＤＣコンバータで降圧された電圧で充電される電装用バッテリと、走行用バッテリによる電装用バッテリの充電を制御するコントロール回路と、前記電装用バッテリの温度又は周囲温度を検出する温度センサとを備え、
前記コントロール回路が、走行用バッテリで電装用バッテリを充電する充電電流を、温度センサの検出温度が設定温度よりも低い状態において、設定温度よりも高い状態の充電電流よりも小さく制御するハイブリッドカーのバッテリシステム。A traveling battery that supplies power to a motor that travels the vehicle, a DC / DC converter that steps down the voltage of the traveling battery, an electrical battery that is charged with a voltage stepped down by the DC / DC converter, and a traveling A control circuit for controlling the charging of the battery for electrical equipment by the battery for electrical use, and a temperature sensor for detecting the temperature or ambient temperature of the battery for electrical equipment,
In the hybrid car in which the control circuit controls the charging current for charging the electric battery with the traveling battery to be smaller than the charging current in the state higher than the set temperature in the state where the temperature detected by the temperature sensor is lower than the set temperature. Battery system. 前記走行用バッテリがリチウムイオン電池又はリチウムポリマー電池である請求項１に記載されるハイブリッドカーのバッテリシステム。   The hybrid car battery system according to claim 1, wherein the battery for traveling is a lithium ion battery or a lithium polymer battery. 前記コントロール回路が、走行用バッテリによる電装用バッテリの充電電流を減少させる設定温度を記憶しており、この設定温度を−１０℃ないし−３５℃としている請求項１又は２に記載されるハイブリッドカーのバッテリシステム。   3. The hybrid car according to claim 1, wherein the control circuit stores a set temperature for reducing a charging current of the electric battery by the running battery, and the set temperature is set to −10 ° C. to −35 ° C. 3. Battery system. 前記コントロール回路が、温度センサの検出温度が設定温度よりも低温状態と、検出温度が設定温度よりも常温状態における電装用バッテリの充電電流を記憶しており、低温状態における電装用バッテリの充電電流を、常温状態の充電電流の１／１０ないし１／２としている請求項１ないし３のいずれかに記載されるハイブリッドカーのバッテリシステム。   The control circuit stores the charging current of the electrical battery when the detected temperature of the temperature sensor is lower than the set temperature, and when the detected temperature is normal temperature than the set temperature, and the charging current of the electrical battery when the temperature is low The hybrid car battery system according to any one of claims 1 to 3, wherein the charging current is 1/10 to 1/2 of a charging current in a room temperature state. 前記コントロール回路が、温度センサの検出温度に対する電装用バッテリの充電電流をルックアップテーブルとして記憶しており、ルックアップテーブルに記憶される検出温度に対応して電装用バッテリの充電電流をコントロールする請求項１ないし４のいずれかに記載されるハイブリッドカーのバッテリシステム。   The control circuit stores, as a lookup table, a charging current of the electrical battery with respect to a temperature detected by the temperature sensor, and controls the charging current of the electrical battery in accordance with the detected temperature stored in the lookup table. Item 5. A hybrid car battery system according to any one of Items 1 to 4. 前記コントロール回路が、温度センサの検出温度に対する電装用バッテリの充電電流を関数として記憶しており、記憶される関数に基づいて電装用バッテリの充電電流をコントロールする請求項１ないし４のいずれかに記載されるハイブリッドカーのバッテリシステム。   5. The control circuit according to claim 1, wherein the control circuit stores a charging current of the electric battery as a function with respect to a temperature detected by the temperature sensor, and controls the charging current of the electric battery based on the stored function. The hybrid car battery system described. 前記コントロール回路が、走行用バッテリの放電電流をコントロールして、電装用バッテリの充電電流を制御する請求項１ないし６のいずれかに記載されるハイブリッドカーのバッテリシステム。   The battery system for a hybrid car according to any one of claims 1 to 6, wherein the control circuit controls a discharge current of the battery for traveling to control a charging current of the battery for electrical equipment. 請求項１ないし７のいずれかに記載のバッテリシステムを備えるハイブリッドカー。   A hybrid car comprising the battery system according to claim 1.
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