CA2641115A1 - Lithium-polymer type battery and control system - Google Patents

Lithium-polymer type battery and control system Download PDF

Info

Publication number
CA2641115A1
CA2641115A1 CA002641115A CA2641115A CA2641115A1 CA 2641115 A1 CA2641115 A1 CA 2641115A1 CA 002641115 A CA002641115 A CA 002641115A CA 2641115 A CA2641115 A CA 2641115A CA 2641115 A1 CA2641115 A1 CA 2641115A1
Authority
CA
Canada
Prior art keywords
battery
temperature
cells
power
cell
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.)
Granted
Application number
CA002641115A
Other languages
French (fr)
Other versions
CA2641115C (en
Inventor
Andre Morin
Jean Rouillard
Jean-Pierre Cote
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.)
Hydro Quebec
Original Assignee
Individual
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
Priority claimed from CA002225585A external-priority patent/CA2225585A1/en
Application filed by Individual filed Critical Individual
Priority to CA2641115A priority Critical patent/CA2641115C/en
Publication of CA2641115A1 publication Critical patent/CA2641115A1/en
Application granted granted Critical
Publication of CA2641115C publication Critical patent/CA2641115C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007Regulation of charging or discharging current or voltage
    • H02J7/007188Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters
    • H02J7/007192Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature
    • H02J7/007194Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature of the battery
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/3644Constructional arrangements
    • G01R31/3648Constructional arrangements comprising digital calculation means, e.g. for performing an algorithm
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/382Arrangements for monitoring battery or accumulator variables, e.g. SoC
    • G01R31/3842Arrangements for monitoring battery or accumulator variables, e.g. SoC combining voltage and current measurements
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/396Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/05Accumulators with non-aqueous electrolyte
    • H01M10/052Li-accumulators
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/05Accumulators with non-aqueous electrolyte
    • H01M10/056Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
    • H01M10/0564Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
    • H01M10/0565Polymeric materials, e.g. gel-type or solid-type
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/42Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H01M10/482Accumulators 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
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/42Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H01M10/486Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring temperature
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/60Heating or cooling; Temperature control
    • H01M10/61Types of temperature control
    • H01M10/615Heating or keeping warm
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/60Heating or cooling; Temperature control
    • H01M10/62Heating or cooling; Temperature control specially adapted for specific applications
    • H01M10/627Stationary installations, e.g. power plant buffering or backup power supplies
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/60Heating or cooling; Temperature control
    • H01M10/63Control systems
    • H01M10/633Control systems characterised by algorithms, flow charts, software details or the like
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/60Heating or cooling; Temperature control
    • H01M10/65Means for temperature control structurally associated with the cells
    • H01M10/657Means for temperature control structurally associated with the cells by electric or electromagnetic means
    • H01M10/6571Resistive heaters
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50Current conducting connections for cells or batteries
    • H01M50/569Constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0013Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0047Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • H02J7/0048Detection of remaining charge capacity or state of charge [SOC]
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0063Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007Regulation of charging or discharging current or voltage
    • H02J7/00712Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H02J7/00714Regulation 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
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007Regulation of charging or discharging current or voltage
    • H02J7/00712Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H02J7/007182Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/374Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] with means for correcting the measurement for temperature or ageing
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2200/00Safety devices for primary or secondary batteries
    • H01M2200/10Temperature sensitive devices
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Power Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Secondary Cells (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Dispersion Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Automation & Control Theory (AREA)
  • Electromagnetism (AREA)

Abstract

Un système de contrôle de pile pour une pile électrolytique solide et métallique, telle qu'une pile lithium-polymère, comprenant des détecteurs de température pour détecter la température des cellules dans la pile, des éléments chauffants pour chauffer les cellules, un contrôleur d'éléments chauffants recevant des signaux des détecteurs de température et contrôlant l'alimentation de courant fourni aux éléments chauffants de façon à maintenir chaque cellule à une température prédéterminée, et un contrôleur d'alimentation qui détecte une demande de puissance de la pile et régler la température prédéterminée en réponse à un niveau de puissance à être fourni par la pile ou à la pile. Le contrôleur d'alimentation permet de régler au moins une température de flottement, une température de charge et une température d'alimentation. Le contrôleur comprend de plus un détecteur de voltage qui détecte un voltage à chaque cellule lorsqu'elles sont actives, et détermine si une des cellules est susceptible d'être endommagée par un usage continu. La pile est débranchée de la prise d'alimentation suite à la confirmation qu'une des cellules pourrait être endommagée.A battery control system for a solid and metallic electrolytic cell, such as a lithium polymer battery, comprising temperature sensors for detecting the temperature of the cells in the cell, heating elements for heating the cells, a controller heating elements receiving signals from temperature sensors and controlling the supply of current supplied to the heating elements so as to maintain each cell at a predetermined temperature, and a power controller which detects a demand for battery power and regulates the temperature predetermined in response to a power level to be supplied by the cell or the cell. The power controller allows you to set at least one float temperature, charge temperature, and feed temperature. The controller further includes a voltage detector which detects a voltage at each cell when they are active, and determines whether one of the cells is likely to be damaged by continuous use. The battery is disconnected from the power outlet following confirmation that one of the cells could be damaged.

Claims (4)

1. Un système de contrôle de piles pour une pile électrolytique solide et métallique comprenant des cellules branchées en série et une prise d'alimentation, le systéme comprenant:
-un détecteur de voltage détectant le voltage de chaque cellule active;
-des moyens pour interpréter le voltage détecté et déterminer si une des cellules est susceptible d'être endommagée par un usage continu;
- des moyens pour débrancher la pile de la prise d'alimentation en réponse à
une confirmation qu'une des cellules pourrait être endommagée;
- un détecteur de courant détectant le courant fournu par les cellules actives;
- des moyens d'interpréter le courant afin de déterminer si une condition de surintensité de courant existe; et - des moyens pour débrancher la pile de la prise d'alimentation suite à une condition de surintensité de courant et pour rebrancher automatiquement la pile lorsque la condition de surintensité de courant cesse.
1. A battery control system for a solid electrolytic cell and metallic including cells connected in series and a socket power supply, the system comprising:
-a voltage detector detecting the voltage of each active cell;
-means to interpret the detected voltage and determine if one of the cells is susceptible to damage by continued use;
- means for disconnecting the battery from the power outlet in response to confirmation that one of the cells could be damaged;
- a current detector detecting the current supplied by the cells active;
- means of interpreting the current in order to determine whether a condition of current overcurrent exists; and - means to disconnect the battery from the power outlet following a overcurrent condition and to automatically reconnect the battery when the overcurrent condition ceases.
2. Un système selon la revendication 1, comprenant en plus :
- un circuit de détection de voltage détectant au moins le voltage de la pile à la prise d'alimentation;
- un circuit d'évaluation de performance de la pile qui interprète les signaux venant du détecteur de voltage et génère des signaux d'évaluations;
- un circuit de télécommunications transmettant les signaux d'évaluation à un réseau.
2. A system according to claim 1, further comprising:
- a voltage detection circuit detecting at least the battery voltage to the plug hole;
- a battery performance evaluation circuit which interprets the signals from the voltage detector and generates evaluation signals;
- a telecommunications circuit transmitting the evaluation signals to a network.
3. Un système selon la revendication 1, comprenant en plus :
- des détecteurs de température détectant la température des cellules;
- des éléments chauffants disposés pour chauffer les cellules;
- un contrôleur d'éléments chauffants recevant des signaux des détecteurs de température et contrôlant l'alimentation de courant aux éléments chauffants de façon à maintenir les cellules à une température prédéterminée; et - un contrôleur d'alimentation détectant une demande de puissance de la pile et réglant la température prédéterminée en réponse à un niveau de puissance fourni à la pile ou par la pile, le contrôleur d'alimentation permettant de régler au moins une température de flottement, une température de charge et une température d'alimentation.
3. A system according to claim 1, further comprising:
- temperature detectors detecting the temperature of the cells;
- heating elements arranged to heat the cells;
- a heating element controller receiving signals from temperature and controlling the power supply to the heating elements of so as to maintain the cells at a predetermined temperature; and - a power controller detecting a request for battery power and setting the predetermined temperature in response to a power level supplied to the battery or by the battery, the power controller allowing adjust at least one floating temperature, one charging temperature and one supply temperature.
4. Un système selon la revendication 3, dans lequel la pile comprend un empilement de cellules plates prismatiques, les détecteurs de température et les éléments chauffants étant disposés aux extrémités de l'empilement, le contrôleur d'éléments chauffants contrôlant l'alimentation de courant aux éléments chauffants de façon indépendante.

Un système selon l'une des revendications 1 à 4, dans lequel la pile est une pile lithium-polymère.
4. A system according to claim 3, wherein the stack comprises a stack of flat prismatic cells, temperature detectors and the heating elements being arranged at the ends of the stack, the heater controller controlling the power supply to the heating elements independently.

A system according to one of claims 1 to 4, in which the cell is a lithium polymer battery.
CA2641115A 1997-12-12 1998-12-14 Lithium-polymer type battery and control system Expired - Lifetime CA2641115C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA2641115A CA2641115C (en) 1997-12-12 1998-12-14 Lithium-polymer type battery and control system

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CA002225585A CA2225585A1 (en) 1997-12-12 1997-12-12 Battery control system
CA2,225,585 1997-12-12
CA002313527A CA2313527C (en) 1997-12-12 1998-12-14 Lithium-polymer type battery and control system
CA2641115A CA2641115C (en) 1997-12-12 1998-12-14 Lithium-polymer type battery and control system

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
CA002313527A Division CA2313527C (en) 1997-12-12 1998-12-14 Lithium-polymer type battery and control system

Publications (2)

Publication Number Publication Date
CA2641115A1 true CA2641115A1 (en) 1999-06-24
CA2641115C CA2641115C (en) 2010-11-02

Family

ID=25679952

Family Applications (2)

Application Number Title Priority Date Filing Date
CA2641115A Expired - Lifetime CA2641115C (en) 1997-12-12 1998-12-14 Lithium-polymer type battery and control system
CA002313527A Expired - Lifetime CA2313527C (en) 1997-12-12 1998-12-14 Lithium-polymer type battery and control system

Family Applications After (1)

Application Number Title Priority Date Filing Date
CA002313527A Expired - Lifetime CA2313527C (en) 1997-12-12 1998-12-14 Lithium-polymer type battery and control system

Country Status (1)

Country Link
CA (2) CA2641115C (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3057998B1 (en) * 2016-10-25 2018-11-30 Peugeot Citroen Automobiles Sa DEVICE AND METHOD FOR CONTROLLING THE TEMPERATURE OF A BATTERY BASED ON THE GRADIENT OF THE ELECTRICAL POWER DELIVERED

Also Published As

Publication number Publication date
CA2313527C (en) 2008-11-18
CA2313527A1 (en) 1999-06-24
CA2641115C (en) 2010-11-02

Similar Documents

Publication Publication Date Title
JP4965763B2 (en) Lithium-polymer battery and control system
US5355072A (en) Battery discharging apparatus
JP3777022B2 (en) Battery charger
US7902796B2 (en) Battery equalization charging method and apparatus
KR102258364B1 (en) Rechargeable battery systems and rechargeable battery system operational method
RU2506603C2 (en) Device to control and charge selected group of battery elements
EP1363344B1 (en) Control system for sodium-sulfur battery
EP1854165B1 (en) Method for the balanced charging of a lithium-ion or lithium-polymer battery
EP1014533A3 (en) A battery charge management architecture
CA2291935C (en) Battery charger with improved reliability
CN106972206A (en) Battery control system and battery pack
CN101277023B (en) Charging device
JP2010068571A (en) Charging apparatus
FR2913531A1 (en) LITHIUM BATTERY PACK AND SYSTEM FOR CHARGING SAME.
KR102112726B1 (en) Respective battery cell charging system using photovoltaic charging system to be communicated with smart device
JP2003282159A (en) Battery control system
CA2641115A1 (en) Lithium-polymer type battery and control system
JP4313809B2 (en) Rechargeable battery pack system and battery pack charge control method
US20130221906A1 (en) Lithium Polymer Battery Charger and Methods Therefor
KR20110085719A (en) Apparatuses of grid connecting for standalone solar power streetlight system and operating methods thereof
US7301307B2 (en) Method and apparatus to charge a battery using determination of battery load current
US6246217B1 (en) Non-aqueous electrolytic battery module for artificial satellite
EP0544566B1 (en) Source monitoring module for battery monitoring unit and battery equipped with the same
CN110931902A (en) Storage battery pack online maintenance method and system
CN102110829A (en) System and method for allowing flow battery energy storage system to safely operate

Legal Events

Date Code Title Description
EEER Examination request
MKEX Expiry

Effective date: 20181214