EP2446503A1 - Procédé et dispositif pour charger des cellules au lithium-cobalt - Google Patents

Procédé et dispositif pour charger des cellules au lithium-cobalt

Info

Publication number
EP2446503A1
EP2446503A1 EP09775730A EP09775730A EP2446503A1 EP 2446503 A1 EP2446503 A1 EP 2446503A1 EP 09775730 A EP09775730 A EP 09775730A EP 09775730 A EP09775730 A EP 09775730A EP 2446503 A1 EP2446503 A1 EP 2446503A1
Authority
EP
European Patent Office
Prior art keywords
current
seconds
charging
lengths
phases
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP09775730A
Other languages
German (de)
English (en)
Inventor
Thomas Wick
Remo Estermann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Texx AG
Original Assignee
Texx AG
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 Texx AG filed Critical Texx AG
Publication of EP2446503A1 publication Critical patent/EP2446503A1/fr
Withdrawn legal-status Critical Current

Links

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
    • 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
    • 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
    • H02J7/0042—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by the mechanical construction
    • 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
    • H01M10/46—Accumulators structurally combined with charging apparatus
    • 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
    • H02J7/0016—Circuits for equalisation of charge between batteries using shunting, discharge or bypass circuits
    • 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 invention relates to the charging of rechargeable batteries, in particular lithium-cobalt cells.
  • Lithium-cobalt cells have several advantages in practice, e.g. a favorable ratio between storable energy and weight.
  • the cells are charged with initially constant charging current.
  • a voltage of, e.g. 4.2 V this voltage is maintained until the charging current, e.g. has fallen back to 3% of the initial stream.
  • the cells are ge ⁇ load during at least a time of charging with a charging current which is varied between a first current value Il and a second current value 12th
  • a charging current which is varied between a first current value Il and a second current value 12th
  • FIG. 1 shows an embodiment of a charging circuit for a battery of cells
  • FIG. 4 shows the cell voltage as a function of time during charging with the current according to FIG. 3; and FIG. 5 shows a detail from the diagram of FIG.
  • lithium-cobalt cell is understood to mean a rechargeable battery cell which uses Li-COO 2 as active cathode material.
  • Charging circuit: 1 shows a circuit for charging a battery 1 comprising a series connection of a plurality of lithium-cobalt cells 2.
  • a charger 3 is fed by a power network 4 and generates a charging current I.
  • the charging current I is controlled by a control unit 5.
  • the control unit 5 is connected to a battery monitoring module 6. This may be e.g. to a "Multicell Addressable Battery Stack" LTC6802 the company Linear Technology Corporation, Milpitas (USA) act.
  • the battery monitoring module 6 is in turn connected to all cells 2.
  • the control unit 5 can measure the voltage across each cell via the battery monitoring module 6. In addition, it can optionally connect a resistor R in parallel to each cell via transistors 7.
  • the formwork according to FIG. 1 can be cascaded by connecting the control unit 5 to a plurality of battery monitoring modules 6, each of which has twelve cells of a larger battery of a total of e.g. 38 batteries connected in series.
  • the process of charging is done by the
  • Control unit 5 controlled, which is designed and structured accordingly.
  • the control unit 5 may be configured as a microprocessor which is programmed to monitor the voltages across the cells and to control the charging process.
  • the control unit 5 also controls the charge current I and its time course within the scope of the present invention.
  • it can drive the transistors 7 to ensure balancing (i.e., charge equal distribution) of the individual cells 2 during charging.
  • the discharging process was carried out by means of continuous operation of the cells in a vehicle on a test track with an average current of 72 A up to a discharge of the cells to the above-mentioned discharge voltage.
  • FIGS. 3-5 illustrate a preferred embodiment of a method according to the invention.
  • the charging current is not constant, but it varies by passing through several successive low and high current phases with current values Il and 12.
  • the two current values Il and 12 should have approximately the following values:
  • the length of the phases must be adapted to the typical relaxation times of the cells.
  • at least some, in particular all, of the deep-flow phases have lengths of at least 8 seconds and / or lengths of at most 180 seconds, in particular at most 48 seconds.
  • at least some, preferably all, of the high flow phases should have lengths of at least 8 seconds and / or lengths of at most 600 seconds, more preferably lengths of at most 360 seconds.
  • time periods are approximately equal to the time it takes for the voltage across the cell to rise after a high pulse current of e.g. 3 seconds and 18 A is again constant (in the millivolt range).
  • the charging current passes through a plurality of identical current cycles Z1, Z2, Z3, etc.
  • Each current cycle comprises a plurality of high and low current phases, wherein a plurality of high-current phases of different length and / or several currents within one current cycle
  • each cycle includes the following sequence: a high current phase of 360 seconds, a low current phase of 33 seconds, a high current phase of 108 seconds, a low current phase of 12 seconds, especially further followed by a high current phase of 108 seconds Low current phase of 12 seconds, a high current phase of 87 seconds, a low current phase of 33 seconds, a high current phase of 12 seconds and a low current phase of 48 seconds.
  • This involves reaction times or the achievement of actual conditions (before the high-current phase). It is currently believed that the sequence of pulses of different lengths will cause inhomogeneities on the electrodes to be avoided.
  • the horizontal axes of FIGS. 3 and 4 are equally scaled, so that the voltage pulses across the cells can be compared with the respective current pulses.
  • the charging should be started at the latest when the cell voltage drops below a value of 3.02 V, since a strong discharge can impair the functionality of the cells. (Deep discharges can lead to a complete destruction of the accumulator)
  • charging first begins with a low current, which, however, is only conditional on apparatus and is not mandatory in connection with the present invention.
  • cycle Zl starts, followed by cycle Z2, etc.
  • the average Re cell voltage as expected. Charging stops when a cell voltage of 4.18V is reached. A La ⁇ the higher voltage is not advisable for security reasons.
  • a loading and unloading was achieved after 70 to 80 charging cycles with the following parameters:
  • the cells were charged with the charging current consisting of a sequence comprising alternating high-current phases of 33 A for 15 seconds and low-current phases of 18 A for 8 seconds.
  • the charging current consisting of a sequence comprising alternating high-current phases of 33 A for 15 seconds and low-current phases of 18 A for 8 seconds.
  • the cells were charged with the charging current consisting of a sequence comprising alternating high-current phases of 33 A for 90 seconds and low-current phases of 18 A for 30 seconds. Results, after 55 - 60 cycles: Loading: 198 Ah, charged energy 28.6 kWh
  • the cells were charged with the charging current being a sequence comprising alternating high current phases of 33 A for 300 seconds and low current phases of 18 A for 180 seconds. Results, after 50 - 55 cycles:

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)
  • Secondary Cells (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

L'invention a pour objectif de charger une cellule rechargeable au lithium-cobalt ayant une capacité C. Pour ce faire, le courant de charge suit plusieurs cycles (Z1, Z2,
EP09775730A 2009-06-24 2009-06-24 Procédé et dispositif pour charger des cellules au lithium-cobalt Withdrawn EP2446503A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CH2009/000218 WO2010148522A1 (fr) 2009-06-24 2009-06-24 Procédé et dispositif pour charger des cellules au lithium-cobalt

Publications (1)

Publication Number Publication Date
EP2446503A1 true EP2446503A1 (fr) 2012-05-02

Family

ID=41666537

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09775730A Withdrawn EP2446503A1 (fr) 2009-06-24 2009-06-24 Procédé et dispositif pour charger des cellules au lithium-cobalt

Country Status (3)

Country Link
US (1) US20120146589A1 (fr)
EP (1) EP2446503A1 (fr)
WO (1) WO2010148522A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11063458B1 (en) * 2015-08-26 2021-07-13 Google Llc Systems and methods for dynamic pulse charging
CN112993420B (zh) * 2015-09-02 2023-08-11 创科无线普通合伙 清洁***

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6040685A (en) * 1996-08-16 2000-03-21 Total Battery Management, Inc. Energy transfer and equalization in rechargeable lithium batteries
JP3740323B2 (ja) * 1998-07-31 2006-02-01 キヤノン株式会社 二次電池の充電方法及びその装置
US7176654B2 (en) * 2002-11-22 2007-02-13 Milwaukee Electric Tool Corporation Method and system of charging multi-cell lithium-based batteries
JP5043777B2 (ja) * 2007-08-22 2012-10-10 パナソニック株式会社 非水電解質二次電池の充電方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2010148522A1 *

Also Published As

Publication number Publication date
WO2010148522A1 (fr) 2010-12-29
US20120146589A1 (en) 2012-06-14

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