WO2017195010A1 - Dispositif de sécurité externe permettant d'éviter l'explosion de batteries utilisées dans des téléphones cellulaires - Google Patents

Dispositif de sécurité externe permettant d'éviter l'explosion de batteries utilisées dans des téléphones cellulaires Download PDF

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Publication number
WO2017195010A1
WO2017195010A1 PCT/IB2016/056909 IB2016056909W WO2017195010A1 WO 2017195010 A1 WO2017195010 A1 WO 2017195010A1 IB 2016056909 W IB2016056909 W IB 2016056909W WO 2017195010 A1 WO2017195010 A1 WO 2017195010A1
Authority
WO
WIPO (PCT)
Prior art keywords
phone
cell phone
current flow
safety device
safety
Prior art date
Application number
PCT/IB2016/056909
Other languages
English (en)
Inventor
Vasudevan Tachoth
Original Assignee
Vasudevan Tachoth
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 Vasudevan Tachoth filed Critical Vasudevan Tachoth
Publication of WO2017195010A1 publication Critical patent/WO2017195010A1/fr

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Classifications

    • 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
    • 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
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00309—Overheat or overtemperature protection
    • 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

Definitions

  • An external safety device to avoid explosion of batteries used in cellular phones is an invention aimed at the safety of consumers.
  • the gadget continuously monitors the external temperature of the cell phone, current flow, and position change. Threshold value is set for the temperature and whenever it is crossed the power switch stops current flow to the phone and indicate the user by giving an alarm.
  • the safety device cuts off the current flow when the user lifts the phone for making a call or something else. This feature is attained by the installation of an infrared sensor in the circuit. Another attribute is the indication of full charge by green LED glow and beeps. This is achieved by analysis using a current sensor. And the charging process discontinues when the battery is fully charged. The functioning of this device is shown in a block diagram of figure 1.
  • This invention relates to the field of electronics and it can be used as an external protective device with the cellular phone. Even though the incidents are rare, explosions of cellular phone batteries increased the concern about the safety among users. Most of the people use cell phones and hence the requirement of an additional protection is essential. It is not needed to carry the device with cell phone.
  • the gadget can be used while charging and the charging process is continuously monitored by this. It measures the temperature of the phone and stops the current flow when this parameter reaches a threshold value. Thus the invented device prevents the chance of overheating which may leads to an explosion. Some of the users have a habit of attending the call or messaging while charging. Safety device detects this and stops the current flow thereby avoiding the possibility of a blast. These are the major benefits of the new gadget. More advantages and working principle are discussed in the detailed description. Prior art and problem to be solved
  • Lithium polymer and Lithium-ion batteries replaced the other types such as Lead acid, Nickel- Cadmium, Nickel Metal Hydride etc owing to their high charge capacity and high energy density.
  • Li-ion battery is a low maintenance battery and it does not have memory effect and scheduled cycling. But some recent incidents diminished the reliability of Lithium-ion (Li-ion) batteries. Explosions happened and customers were severely injured. And the studies proved that the reason for explosion is thermal runaway taking place inside the battery.
  • Inherent safety mechanisms are there in the battery packs. Protection circuit, which is built into the pack to maintain the voltage and current in a secure range, limits the peak voltage of each cell during charge. Pressure relief vent, positive temperature coefficient devices, thermal fuses, shut down separators, circuit breakers like magnetic switches etc are available for avoiding battery hazards. Electrolyte and active materials can be changed with the aim of preventing detonation. But these safety mechanisms may fail in consequence of abusive conditions or ambient temperature (particularly in equatorial regions). Even though this happens only for one in ten million batteries, users have a great concern about the safety means. Possibilities of explosion are very rare but we cannot take the chance with the life of a human being. Thus a peripheral safety device is necessary to avoid the chances of blast thereby providing extra protection to the user.
  • the principal object of this invention is to prevent the accidents caused by overheating of cellular phone batteries.
  • Another purpose of this invention is to cut off the charging process while the customer uses the phone.
  • This invention also aims at secure use of cellular phones achieved with an external protection device.
  • Another intention behind this invention is to prevent the abusive conditions like overcharging.
  • the invention is about a peripheral safety device for cell phones to avoid the prospect of explosions in different situations.
  • the USB (Universal Serial Bus) connector of cell phone charger is given to the safety device inlet and a USB connector from its outlet is given to the cell phone. So the device controls the flow of charge through it and discontinues the process when necessary. It measures the exterior temperature of cell phone and stops the charging course at specified cut off. The device also gives an alarm to the user when the battery is fully charged. Alarm includes beep sound from a buzzer and LED (Light Emitting Diode) glow.
  • Temperature sensor, infrared sensor, and current sensor are the three important components of the safety device. It makes use of the infrared sensor for disconnecting the charger whenever the cell phone is lifted off (probably for making or attending a call) from the safety device. That means if we use the phone while charging, the safety device senses the position change and charging automatically stops.
  • thermocouples thermocouples
  • safety vents etc are already there in the phone. But it is unable to detect the failure of these systems since they are inside the battery or cellular phone.
  • the introduced safety device is a solution to the problems of current protection circuits and systems. Since it is a peripheral device its working is transparent to the customer. Probability of overheating is indicated to the user, at the same time it helps the phone to get rid of the explosion-triggering situation. Continuous beep sound and red LED glow implies temperature rise above the threshold value. Beep sound for a short time (4 to 6 beeps) and green LED glow show that the battery is fully charged.
  • the safety device introduced here is external gadget to the cellular phone and its work is based on continuous monitoring of parameters such as temperature and current.
  • the three major components of this device are temperature sensor, current sensor and infrared sensor.
  • Other components are microcontroller (uC), analog to digital converter (A/D), DC (Direct Current) power switch, Light Emitting Diode (LED), and buzzer.
  • Analog values measured by each sensor are given to A/D converter for converting those values into digital form. Based on the analyzed values status is shown using LED glow and beep sound. Process of charging continues or discontinues depending upon the same result. This can be achieved by using a switch in the circuit.
  • the overall functioning of safety device is shown in block diagram, figure 1. Full forms of abbreviations given in the schematic have been discussed already.
  • DC output to the cellular phone is controlled by the parameters measured by the sensors.
  • Temperature sensor measures the external temperature of the cell phone. Threshold value is given as 45 ° C. Internal temperature above which thermal runaway occurs is nearly 150° C and the skin temperature of battery at that time will be around 90 °C.
  • Infrared sensor is installed in the safety device for detecting the position change of cell phone. It's a habit of customers to use their phones during charging and direct to overheating situations. In order to avoid these problems infrared sensor in the circuit senses the position change (lifting the phone for calling, messaging, playing games etc) of the cellular phone. According to the information from this sensor microcontroller gives instruction to the switch and it disconnects the circuit. Thus current flow automatically stops whenever the user makes a call or does something else in the phone. This ensures the safety of the consumer and he/she can use cellular phone without anxiety.
  • overcharging is one of the main problems leading to thermal runaway and blast.
  • a good number of users abuse their mobile phones through overcharging. Some of them connect the charger and leave it overnight. It is danger to charge the phone while sleeping in a closed room with fan on. Here the ambient temperature may increase and battery may explode.
  • the safety device inhibits the option of blast by detaching the current. This is accomplished by utilizing a current sensor connected to the microcontroller. When the battery is fully charged this sensor analyze it and microcontroller instructs the switch to disconnect the process. The user is alerted by green LED glows and five beeps from the buzzer. Even though the consumer does not see or hear the alarm, current gets off automatically.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Telephone Function (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Secondary Cells (AREA)

Abstract

L'invention concerne un dispositif de sécurité externe visant la sécurité des consommateurs et permettant d'éviter l'explosion des batteries utilisées dans des téléphones cellulaires. Le dispositif de sécurité surveille en continu la température extérieure, le flux de courant et le changement de position du téléphone cellulaire. Une valeur de seuil est fixée pour la température et, chaque fois que cette valeur est dépassée, l'interrupteur d'alimentation interrompt le flux de courant vers le téléphone. En outre, une indication est fournie à l'utilisateur à l'aide d'une lumière à DEL (diode électroluminescente) rouge et d'un bip sonore continu. Le dispositif de sécurité interromp le flux de courant lorsque l'utilisateur se saisit du téléphone pour passer un appel ou autre. Cette caractéristique est mise en oeuvre par le montage d'un capteur infrarouge dans le circuit. Une autre caractéristique est l'indication de charge intégrale du téléphone cellulaire par une lueur de DEL verte et cinq bips qui sont obtenus par un capteur de courant. Et le processus de charge cesse lorsque la batterie est entièrement chargée.
PCT/IB2016/056909 2016-05-12 2016-11-17 Dispositif de sécurité externe permettant d'éviter l'explosion de batteries utilisées dans des téléphones cellulaires WO2017195010A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN201641016590 2016-05-12
IN201641016590 2016-05-12

Publications (1)

Publication Number Publication Date
WO2017195010A1 true WO2017195010A1 (fr) 2017-11-16

Family

ID=60266363

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2016/056909 WO2017195010A1 (fr) 2016-05-12 2016-11-17 Dispositif de sécurité externe permettant d'éviter l'explosion de batteries utilisées dans des téléphones cellulaires

Country Status (1)

Country Link
WO (1) WO2017195010A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050077878A1 (en) * 2003-10-14 2005-04-14 Dave Carrier Protection methods, protection circuits and protective devices for secondary batteries, a power tool, charger and battery pack adapted to provide protection against fault conditions in the battery pack
US20110291613A1 (en) * 2010-05-28 2011-12-01 Qualcomm Incorporated Temperature sensor interface for wireless and wired charging
CN104377660A (zh) * 2013-08-13 2015-02-25 中兴通讯股份有限公司 一种移动终端充电温度保护方法及装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050077878A1 (en) * 2003-10-14 2005-04-14 Dave Carrier Protection methods, protection circuits and protective devices for secondary batteries, a power tool, charger and battery pack adapted to provide protection against fault conditions in the battery pack
US20110291613A1 (en) * 2010-05-28 2011-12-01 Qualcomm Incorporated Temperature sensor interface for wireless and wired charging
CN104377660A (zh) * 2013-08-13 2015-02-25 中兴通讯股份有限公司 一种移动终端充电温度保护方法及装置

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