JP4910423B2 - バッテリパック、電子機器、およびバッテリ残量検出方法 - Google Patents
バッテリパック、電子機器、およびバッテリ残量検出方法 Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
- G01R19/16538—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies
- G01R19/16542—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies for batteries
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/3644—Constructional arrangements
- G01R31/3648—Constructional arrangements comprising digital calculation means, e.g. for performing an algorithm
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3828—Arrangements for monitoring battery or accumulator variables, e.g. SoC using current integration
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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
- H01M10/44—Methods for charging or discharging
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
-
- 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]
-
- 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
- H02J7/005—Detection of state of health [SOH]
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
-
- 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
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
-
- 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
Description
また、本発明の他の目的は、バッテリ残量をより正確に検出できるようにした電子機器を提供することである。
図1は、本発明の実施の形態に係るデジタルカメラおよびバッテリパックの要部構成を示す図である。
図2に示すように、バッテリ保護回路12内のマイクロコントローラ110は、CPU(Central Processing Unit)111、ドライバ112、通信インタフェース回路113、およびA/D変換回路114を備えている。
デジタルカメラ2は、バッテリ残量表示のための機能として、残量演算部211および表示処理部212を備える。これらの機能は、マイクロコントローラ21によって実現される。また、バッテリ保護回路12は、バッテリ残量表示のための機能として、充放電回数測定部131、劣化率出力部132、電流積算部133、および積算値補正部134を備える。これらの機能は、マイクロコントローラ110によって実現される。
バッテリ残量(分)={(現在の電流積算値[mAh]×(1−劣化率))/満充電時の電流積算値[mAh]}×(1.0W当たりの撮影時間[分・W]/消費電力[W])
ここで、現在の電流積算値は、バッテリセル11における充放電電流の積算値である。また、劣化率は、バッテリセル11の劣化の度合いを示した指数であり、0以上1以下の値をとる。すなわち、劣化率が0のとき、まったく劣化のない新品のバッテリセル11であることを示し、劣化率が大きいほど、バッテリセル11の劣化が進んでいることを示し、劣化率が1のとき、劣化が進んで充放電が完全に不可能であることを示す。本実施の形態では特に、充放電回数が多いほどバッテリ容量が低下することに鑑み、劣化率は、バッテリセル11における充放電回数に応じた容量低下率を示すことにする。
上記の従来の手法に対して、本実施の形態に係る充放電回数測定部131は、バッテリセル11の電流積算値を基に充放電回数をカウントする。しかも、この手法では、充電時の電流(充電電流)のみ積算した値を基に、充放電回数をカウントすることが特徴である。
この測定手法では、図7に示すように、充放電回数測定部131は、一定時間tごとの充電電流の積算値を基に、充放電回数の加算値を演算する。この加算値は、一定時間tにおける充電電流の積算値を、満充電時における電流積算値で除算することで算出され、算出した加算値を、その時点で算出されていた充放電回数に加算した値が、劣化率出力部132に出力される。
従来では、図8に示すような直線を用いて、充放電回数を劣化率に換算していた。図8では、例として32回充放電を繰り返したときの劣化率をあらかじめ測定しておき、その測定結果を基に作成した直線が示されている。従って、充放電回数が32回のときに劣化率が0.1だとすると、充放電回数が64回のときには劣化率が0.2と算出される。あるいは、従来では、このような直線に基づき、充放電回数を複数のステップに分割して、ステップごとに劣化率に換算していた。しかし、実際には、充放電回数と劣化率との関係は線形にはならないため、劣化率の誤差は大きく、そのためにバッテリ残量を正確に表示できなかった。
二次電池では、一般に、充放電回数が少ない場合には劣化率が大きく増加し、その後増加率は緩やかになって、ある回数を超えると再び増加率が大きくなることが知られている。例えば、リチウムイオン二次電池には、充放電回数が0回〜約10回の範囲では、劣化率が急激に増加し、充放電回数が約10回〜約300回の範囲では、劣化率が緩やかに増加し、充放電回数が約300回を超えると、劣化率が再び急激に増加する特性を持つものがある。
充放電電流の積算値とバッテリセル11の電圧との間には一定の関係があることが知られている。図10のグラフに示す曲線は、このような特性に基づき、バッテリセル11の電極端子を開放したときの電圧と充放電電流の積算値との関係を示すものである。このような曲線を補正曲線として利用し、充放電電流から検出した電流積算値を、そのときのバッテリセル11の電圧に応じた補正曲線上の電流積算値に近づけることで、電流積算値の誤差を低減することができる。このような補正は、バッテリセル11の電極端子を開放したときに実行する必要があり、従来では、消費電力を抑制するために、充電完了後に1度だけ実行していた。なお、このような補正曲線を用いた補正は、OCV(Open Circuit Voltage)補正などと呼ばれている。
この図11に示すように、本実施の形態では、上記と同じ補正曲線上に、従来より多くの補正ポイント(図11では例として16ポイント)を設定し、各補正ポイントを直線で接続して近似した折れ線を生成する。そして、この折れ線を中心として、例えば±0.4%といった所定の範囲を、誤差許容領域に設定する。
Claims (4)
- 二次電池からの各種検出値に基づく所定の処理を実行する処理回路が前記二次電池と一体に収容されたバッテリパックにおいて、
前記二次電池に対する充電電流の検出値を積算する充電電流積算部と、
前記充電電流積算部による前記充電電流の積算値を基に、前記二次電池の充放電回数を測定する充放電回数測定部と、
前記充放電回数測定部により測定された前記充放電回数を基に、前記二次電池の劣化度合いを示す劣化率を算出する劣化率算出部と、
前記劣化率算出部により算出された前記劣化率を、前記二次電池の放電負荷である外部機器に対して出力する通信部と、
を有し、
前記充放電回数測定部は、前記充電電流積算部による前記充電電流の積算値が、所定のしきい値に達するごとに、満充電時における前記充電電流の積算値に対する前記しきい値の割合の分だけ、前記充放電回数を加算するバッテリパック。 - 前記充電電流積算部は、前記充電電流の検出値を前記しきい値まで繰り返し積算し、
前記充放電回数測定部は、前記充電電流積算部による前記充電電流の積算値が前記しきい値に達するごとに、前記充放電回数をカウントアップする、
請求項1記載のバッテリパック。 - 二次電池から電源の供給を受けて動作する電子機器において、
前記二次電池からの各種検出値に基づく所定の処理を実行する処理回路が前記二次電池と一体に収容された着脱可能なバッテリパックと、
前記バッテリパックと通信する第1の通信部と、
前記二次電池の充放電電流の積算値と、前記二次電池の劣化度合いを示す劣化率とを、前記第1の通信部を通じて前記バッテリパックから受け取り、前記二次電池の残量を算出するバッテリ残量演算手段と、
を有し、
前記バッテリパックは、
前記二次電池に対する充電電流の検出値を積算する充電電流積算部と、
前記充電電流積算部による前記充電電流の積算値を基に、前記二次電池の充放電回数を測定する充放電回数測定部と、
前記充放電回数測定部により測定された前記充放電回数を基に前記劣化率を算出する劣化率算出部と、
前記二次電池の前記充放電電流の検出値を積算する充放電電流積算部と、
前記劣化率算出部により算出された前記劣化率と、前記充放電電流積算部による前記充放電電流の積算値とを前記第1の通信部に対して出力する第2の通信部と、
を有し、
前記充放電回数測定部は、前記充電電流積算部による前記充電電流の積算値が、所定のしきい値に達するごとに、満充電時における前記充電電流の積算値に対する前記しきい値の割合の分だけ、前記充放電回数を加算する電子機器。 - 二次電池の残量を検出するためのバッテリ残量検出方法において、
前記二次電池が収容されたバッテリパック内に設けられた充電電流積算部が、前記二次電池に対する充電電流の検出値を積算し、
前記バッテリパック内に設けられた充放電回数測定部が、前記充電電流積算部による前記充電電流の積算値を基に、前記二次電池の充放電回数を測定し、
前記バッテリパック内に設けられた劣化率算出部が、前記充放電回数測定部により測定された前記充放電回数を基に、前記二次電池の劣化度合いを示す劣化率を算出し、
前記バッテリパック内に設けられた充放電電流積算部が、前記二次電池の充放電電流の検出値を積算し、
前記二次電池の放電負荷である電子機器内に設けられたバッテリ残量演算手段が、前記劣化率算出部により算出された前記劣化率と、前記充放電電流積算部による前記充放電電流の積算値とを基に、前記二次電池の残量を算出し、
前記充放電回数測定部は、前記充電電流積算部による前記充電電流の積算値が、所定のしきい値に達するごとに、満充電時における前記充電電流の積算値に対する前記しきい値の割合の分だけ、前記充放電回数を加算するバッテリ残量検出方法。
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
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JP2006051275A JP4910423B2 (ja) | 2006-02-27 | 2006-02-27 | バッテリパック、電子機器、およびバッテリ残量検出方法 |
TW096105271A TW200746502A (en) | 2006-02-27 | 2007-02-13 | Battery pack, electronic equipment, and battery remaining capacity detecting method |
CN2007800004250A CN101322280B (zh) | 2006-02-27 | 2007-02-26 | 电池组、电子仪器、和检测电池余量的方法 |
PCT/JP2007/053495 WO2007099898A1 (ja) | 2006-02-27 | 2007-02-26 | バッテリパック、電子機器、およびバッテリ残量検出方法 |
US11/912,845 US8359174B2 (en) | 2006-02-27 | 2007-02-26 | Battery pack, electronic appliance, and method of detecting remaining amount of battery |
EP07714927A EP1990859A1 (en) | 2006-02-27 | 2007-02-26 | Battery pack, electronic device and method for detecting remaining quantity in battery |
KR1020077024766A KR20080099121A (ko) | 2006-02-27 | 2007-02-26 | 배터리 팩, 전자 기기 및 배터리 잔량 검출 방법 |
JP2011263243A JP5229376B2 (ja) | 2006-02-27 | 2011-12-01 | バッテリパック、電子機器、およびバッテリ残量検出方法 |
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JP2006051275A JP4910423B2 (ja) | 2006-02-27 | 2006-02-27 | バッテリパック、電子機器、およびバッテリ残量検出方法 |
JP2011263243A JP5229376B2 (ja) | 2006-02-27 | 2011-12-01 | バッテリパック、電子機器、およびバッテリ残量検出方法 |
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JP2011263243A Expired - Fee Related JP5229376B2 (ja) | 2006-02-27 | 2011-12-01 | バッテリパック、電子機器、およびバッテリ残量検出方法 |
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US (1) | US8359174B2 (ja) |
EP (1) | EP1990859A1 (ja) |
JP (2) | JP4910423B2 (ja) |
KR (1) | KR20080099121A (ja) |
CN (1) | CN101322280B (ja) |
TW (1) | TW200746502A (ja) |
WO (1) | WO2007099898A1 (ja) |
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CN101322280A (zh) | 2008-12-10 |
WO2007099898A1 (ja) | 2007-09-07 |
JP5229376B2 (ja) | 2013-07-03 |
CN101322280B (zh) | 2013-01-02 |
JP2007234257A (ja) | 2007-09-13 |
JP2012093363A (ja) | 2012-05-17 |
KR20080099121A (ko) | 2008-11-12 |
TWI338397B (ja) | 2011-03-01 |
TW200746502A (en) | 2007-12-16 |
EP1990859A1 (en) | 2008-11-12 |
US8359174B2 (en) | 2013-01-22 |
US20090171598A1 (en) | 2009-07-02 |
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