WO2007034702A1 - Procede et appareil de recharge d'un accumulateur - Google Patents

Procede et appareil de recharge d'un accumulateur Download PDF

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Publication number
WO2007034702A1
WO2007034702A1 PCT/JP2006/317987 JP2006317987W WO2007034702A1 WO 2007034702 A1 WO2007034702 A1 WO 2007034702A1 JP 2006317987 W JP2006317987 W JP 2006317987W WO 2007034702 A1 WO2007034702 A1 WO 2007034702A1
Authority
WO
WIPO (PCT)
Prior art keywords
charging
secondary battery
discharge
battery
preparatory
Prior art date
Application number
PCT/JP2006/317987
Other languages
English (en)
Japanese (ja)
Inventor
Naoya Goto
Original Assignee
Sanoh Kogyo Kabushiki Kaisha
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sanoh Kogyo Kabushiki Kaisha filed Critical Sanoh Kogyo Kabushiki Kaisha
Publication of WO2007034702A1 publication Critical patent/WO2007034702A1/fr

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Classifications

    • 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
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/0071—Regulation of charging or discharging current or voltage with a programmable schedule
    • 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

Definitions

  • the present invention relates to a secondary battery charging method and apparatus, and more particularly to a battery pack charging method and apparatus in which a large number of secondary batteries are connected in series or in parallel.
  • a battery pack in which a large number of secondary batteries are connected in series or in parallel is widely used.
  • battery capacity and density have been rapidly increasing. For example, when it becomes a large-capacity battery pack used for a power source of an electric vehicle or the like, 100 or more batteries (hereinafter referred to as cells) are connected in series.
  • a problem with this type of battery pack is that the self-discharge rate of each cell varies. Because of this variation in the self-discharge rate, it is necessary to devise a charging method in order to fully charge all the cells.
  • Figure 4 (a) shows the charging rate of each cell, using a battery pack with 20 cell power as an example. When a new battery pack is fully charged, the charging rate of each cell is 100%.
  • the charging rate may eventually become as shown in Fig. 4 (b).
  • the charging rate of each cell is approximately 50%, but the individual cells that make up the battery pack have different self-discharge rates. The charging rate differs slightly for the cells.
  • Fig. 4 (c) shows the charging rate of each cell when the state power of Fig. 4 (b) is further discharged until the assembled battery reaches a predetermined end-of-discharge voltage. In this case, depending on the cell, the battery is overdischarged.
  • a large-capacity battery used for a power source of an electric vehicle or the like has a power that can be adjusted by a heat dissipation condition or a cooling system.
  • a small-capacity battery used for a starter robot This is particularly problematic for batteries that do not penetrate the cooling system in terms of cost and practicality.
  • an object of the present invention is to solve the problems of the conventional technology, suppress an increase in the battery temperature peak, and make it possible to fully charge all the cells of the battery pack evenly.
  • the object is to provide a battery charging method and apparatus.
  • a charging method is a secondary battery charging method for charging a string-and-battery in which a plurality of secondary battery cells are connected in series or in parallel.
  • the step of charging the secondary battery until it is fully charged, and a discharge step of performing a short-time preparatory discharge with a predetermined discharge current immediately after the completion of the charge, are characterized by the following.
  • a charging device is a secondary battery charging device that charges a string-and-battery in which a plurality of secondary battery cells are connected in series or in parallel.
  • the oxygen gas generated in the positive electrode during the charging process is absorbed by the positive electrode due to the discharge, and as a result, recombines with hydrogen to form water. Since the chemical reaction to be generated is suppressed, an increase in the battery temperature peak can be suppressed. For this reason, it is possible to evenly fully charge all the cells of the battery pack without problems due to temperature rise.
  • FIG. 1 is a circuit diagram showing a charging circuit for carrying out a secondary battery charging method according to the present invention.
  • FIG. 2 is a time chart showing the relationship between charging / discharging switching timing, battery temperature change, and voltage change in the secondary battery charging method according to the present invention.
  • FIG. 3 is a graph showing a change in discharge capacity of a charged battery according to a method for charging a secondary battery according to the present invention.
  • FIG. 4 is a graph showing variation in self-discharge rate in a conventional secondary battery.
  • FIG. 5 A graph showing the variation in the charge rate when overcharged to cope with the variation in the self-discharge rate of the secondary battery.
  • FIG. 1 is a circuit diagram of a secondary battery charging apparatus according to the present embodiment.
  • reference numeral 10 indicates a battery pack of a secondary battery to be charged.
  • the cells constituting the battery pack 10 are nickel-metal hydride batteries, and many cells are connected in series.
  • Reference numeral 12 denotes a power supply unit that supplies power necessary for charging.
  • Reference number 14 is a controller that controls the sequence of charge / discharge circuit switching. This controller switches the first switch 16 and the second switch 18 using transistors on and off according to a programmed sequence. In this case, when charging the battery pack 10, the first switch 16 is turned on and the second switch 18 is turned off to form a charging circuit. As will be described later, when preparatory discharge of the battery pack 10 is performed after charging is completed, the first switch 16 is OFF and the second switch 18 is ON. It is designed to switch to a preparatory discharge circuit.
  • FIG. 2 is a time chart showing the relationship between changes in the voltage and temperature of the battery pack 10 during the charging method according to the present embodiment and the switching operation between charging and discharging.
  • TO indicates a point in time when charging of the battery pack 10 is started.
  • the second switch 18 is turned off and charging is started.
  • T 1 indicates a point in time when charging of the battery pack 10 is completed.
  • the controller 14 detects that the voltage satisfies a predetermined termination condition, turns OFF the first switch 16, opens the charging circuit, and stops charging.
  • the second switch 18 is turned on to close the preparatory discharge circuit and perform a short preparatory discharge.
  • the discharge current of the preparatory discharge is passed for 90 seconds at a 2-hour rate.
  • a curve 100 indicated by a thick line indicates a change in battery temperature when the preliminary discharge according to the present embodiment is performed
  • a curve 102 indicated by a thin line indicates the battery temperature when the preliminary discharge is not performed. Showing change.
  • the battery temperature continues to rise because a chemical reaction in which oxygen generated in the positive electrode and hydrogen in the negative electrode are combined to become water continues even after the charging is completed. It is considered that the battery temperature rises due to the reaction heat generated at that time. What is lost due to temperature rise is a part of the energy stored in the battery by charging.
  • the preparatory discharge is executed immediately after the completion of charging until the battery temperature reaches the maximum value.
  • the battery temperature increase after the completion of charging can be suppressed.
  • the cells can be charged evenly.
  • FIG. 3 is a graph showing the discharge characteristics of the charged battery pack 10.
  • the bold line represents the case where the preparatory discharge was performed, and the thin line represents the case where the preparatory discharge was not performed.
  • the discharge characteristics are slightly better for the battery that was preliminarily discharged.
  • the present invention has been described with reference to the embodiment applied to an assembled battery in which a large number of secondary battery cells are connected in series.
  • the present invention is similarly applied to an assembled battery in which secondary battery cells are connected in parallel. Of course, it can be applied.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Secondary Cells (AREA)

Abstract

Selon l'invention, tous les éléments d'un bloc d'éléments d'accumulateur peuvent être entièrement et uniformément rechargés sans augmenter la valeur maximale de la température de l'accumulateur. L'invention concerne également un procédé de recharge d'un accumulateur qui permet de recharger un accumulateur assemblé dans lequel une pluralité d'éléments sont connectés en série. Selon ledit procédé, l'accumulateur est entièrement rechargé, et directement après la recharge, une décharge de préparation d'un courant de décharge prescrit est effectuée pendant une courte durée.
PCT/JP2006/317987 2005-09-26 2006-09-11 Procede et appareil de recharge d'un accumulateur WO2007034702A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2005278054A JP2007089363A (ja) 2005-09-26 2005-09-26 二次電池の充電方法および装置
JP2005-278054 2005-09-26

Publications (1)

Publication Number Publication Date
WO2007034702A1 true WO2007034702A1 (fr) 2007-03-29

Family

ID=37888753

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2006/317987 WO2007034702A1 (fr) 2005-09-26 2006-09-11 Procede et appareil de recharge d'un accumulateur

Country Status (2)

Country Link
JP (1) JP2007089363A (fr)
WO (1) WO2007034702A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04261342A (ja) * 1991-02-12 1992-09-17 Toshiba Battery Co Ltd 二次電池の充電回路
JPH09161760A (ja) * 1995-12-12 1997-06-20 Toyota Motor Corp 鉛蓄電池用セパレータ
JP2003157906A (ja) * 2001-11-22 2003-05-30 Japan Storage Battery Co Ltd 制御弁式鉛蓄電池の充電方法

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0515078A (ja) * 1991-07-02 1993-01-22 Matsushita Electric Ind Co Ltd 充電装置
JPH06133468A (ja) * 1992-10-19 1994-05-13 Matsushita Electric Ind Co Ltd 密閉式ニッケル水素蓄電池の充電方式

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04261342A (ja) * 1991-02-12 1992-09-17 Toshiba Battery Co Ltd 二次電池の充電回路
JPH09161760A (ja) * 1995-12-12 1997-06-20 Toyota Motor Corp 鉛蓄電池用セパレータ
JP2003157906A (ja) * 2001-11-22 2003-05-30 Japan Storage Battery Co Ltd 制御弁式鉛蓄電池の充電方法

Also Published As

Publication number Publication date
JP2007089363A (ja) 2007-04-05

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