Micro Battery

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  • Handling Precautions
  • Precautions in Designing a Memory Backup Circuit
  • Precautions in Designing
  • Precautions for Mounting
  • Interpretation of batteries in the European Directives
  • Best Management Practices for Perchlorate Materials
  • Regulations for the Transportation of Lithium Batteries

Precautions

Handling Precautions

Please read and observe the following precautions thoroughly. Coin Manganese Dioxide Lithium Batteries contain flammable materials, such as lithium and organic solvent. Improper battery handling may cause leakage, overheating, explosion or ignition of batteries, which may lead to injury or product failure.

!WARNING
  • Keep batteries away from children.
    Swallowing a battery can cause chemical burns or penetration of the mucous membrane. In the worst case, may result in death. If a child happens to swallow a battery, immediately seek medical attention.
  • Never charge batteries. Charging batteries may cause battery electrolyte to seethe or battery internal pressure to rise. Leakage, heating, explosion or ignition of batteries may result.
  • Do not heat or dispose of batteries in fire. Do not modify nor disassemble batteries. This may damage gaskets, and may cause ignition, heating, leakage or explosion.
  • Insert batteries (+) (-) correctly. Erroneous insertion of batteries may result in battery short-circuiting depending on types of devices. Leakage, heating, explosion or ignition of batteries may result.
  • In case of eye contact with battery electrolyte, immediately flush eyes thoroughly with water, do not rub the eyes, and consult a doctor.
  • In case battery electrolyte comes into contact with the mouth, gargle and rinse thoroughly and consult a doctor immediately.
  • Do not connect (+) and (-) of batteries by wire. Do not carry nor store batteries with metallic necklace or hairpin.
    It may cause short-circuit and a large current flow into batteries, as a result, leakage, heating, explosion or ignition of batteries may result.
  • Keep away from fire if batteries have leakage or odor to prevent ignition of battery electrolyte.
  • Do not solder batteries directly. Excessive heating may cause deformation of battery components such as gaskets, which may lead to battery swelling, leakage, explosion or ignition.
  • When batteries are stored or disposed of, isolate or cover positive (+) and negative (-) terminals. If batteries are mixed with other batteries or metals, short-circuit may be caused and leakage, heating, explosion or ignition of batteries may result.
  • Do not mix the used batteries together with new batteries or different types of batteries. Leakage, heating, explosion or ignition of batteries may result due to different characteristics.
  • Do not fix batteries on the skin by adhesive cellophane tape; it may damage the skin.
!PRECAUTIONS
  • Do not drop, apply strong force to nor deform batteries. Leakage, heating, explosion or ignition may result.
  • Do not store, use nor leave batteries at high-temperatures or high-humidity such as inside of cars in the sun. Avoid exposure to direct sunlight to prevent leakage, heating, explosion or ignition.
  • Do not wet batteries with water. This may cause ignition of batteries.
  • Depending on types of devices, batteries positive (+) and negative (-) terminals may contact with metallic part at entrance of battery compartments. Insert batteries into devices in the way not to cause short-circuit.
  • Depending on types of devices, batteries may not be suitable for use on certain specification or performance. Use suitable batteries correctly on devices in accordance with devices' instruction manuals and handling precautions.
  • Do not store nor use batteries in high temperature and high humidity location and where batteries are exposed to direct sunlight. Storage in high temperature and high humidity location may cause leakage, heating, explosion or ignition and in some cases, batteries' performance and life may be deteriorated.
  • When abnormality such as heating or deformation is found on batteries during use or storage, stop using the batteries. This may cause leakage, heating and explosion.
  • Dispose in accordance with applicable federal state and local regulations.

Precautions in Designing a Memory Backup Circuit

Primary Coin Manganese Dioxide Lithium Batteries are not rechargeable. When used for memory backup in combination with another power source, current may flow into the battery from the other source.
To prevent this, include a protection diode and resistor in the circuit so that no battery charging or overdischarging can occur.

1.Allowable Range of Diode Back-Leakage Current
To prevent the battery from being charged by the main power source, be sure to use a back-current prevention diode and a protection resistor. Select a silicon diode or a Schottky diode with minimum leakage current, and design the circuit so that the amount of charging due to leakage current does not exceed 2% of the nominal battery capacity over the total period of use.
Backup Circuit Example

2.Maximum Allowable Charge Current to Battery
A protection resistor is needed to prevent diode failure from allowing a large current to flow into the battery. The following table shows the maximum allowable charging current in the event of diode failure.
ModelMaximum changing currentModelMaximum changing current
CR12163.5mACR2032W10.0mA
CR122010.0mACR2050W10.0mA
CR16164.0mACR2450W15.0mA
CR16202.5mACR2477W10.0mA
CR16324.0mA  
CR201610.0mA  
CR20255.0mA  
CR203210.0mA  
CR243025.0mA  
CR2450B100.0mA  
CR247710.0mA  
How to Calculate Protection Resistance R

Protection resistance R must exceed the value calculated in the following formula:

* In this equation, the worst-case battery voltage (0) is assumed.

Precautions in Designing

To use batteries efficiently, observe the following precautions.

  • Do not solder batteries directly. Excessive heating may cause deformation of batteries and components such as gaskets, which may lead to swelling, leakage, explosion or ignition of batteries.
  • Observe soldering conditions for tabbed batteries to be specified by manufacturers. Use tabbed batteries if soldering is required. Excessive heating may cause deformation of gaskets, leakages or perforamance deterioration of batteries. Be sure not to allow battery temperature to exceed 70℃ during soldering.
  • Use nickel-plated iron or stainless steel for the terminals that contact batteries.
  • Make sure that terminal contact pressure is 100gf minimum for stable contact.
  • Keep batteries and contact terminal surfaces clean and free from moisture and foreign matter.
  • Before inserting batteries, check to make sure that battery contact terminals are normal, not bent or damaged. Bent terminals may not make proper contact with the battery or may cause a short circuit.
  • Do not over discharge batteries lower than 0V. It may lead to reversed polarity and cause ignition, heating, leakage or explosion.
  • Design equipment so that infants cannot easily remove batteries and swallow them.
  • Consult a sales representative when series or parallel connection of several batteries is required.

Precautions for Mounting

When placing batteries on the circuit board, please take the following precautions to avoid degradation of battery capacity and poor contact with the board.

1. Overlapping Batteries
Coin Manganese Dioxide Lithium Batteries are as shown below. Almost the entire surfance is composed of positive (+) and negative (-) metallic surfaces with a thin cylindrical seal, called the gasket, in between them. When batteries are overlapped or mixed together in a disorderly way, their positive (+) and negative (-) terminals touch and may result in a shor circuit.
2. Avoid placing batteries in metal containers or on metal surfaces
If batteries are placed in a metal container or on a metal surface, the positive (+) and negative (-) terminals may short-circuit through the conductive surface.
3. When Held with Metallic Tweezers
When held with a pair of metallic tweezers as shown, batteries may short-circuit through the tweezers.
4. Avoid stacking circuit boards
When circuit boards containing batteries are stacked, their conductive traces may touch and create a battery discharge circuit that consumes battery power.
5. Discharge through Conductive Electrostatic Prevention Mats
Conductive mats are widely used to prevent static electricity from destroying semiconductors.
If a circuit board with mounted battery is put on a conductive mat, the soldered conductors may touch the mat, providing a discharge path for batteries.
6. Avoid handling batteries with bare hands
Touching batteries with bare hands may increase surface resistance due to sweat or oil, causing contact performance to deteriorate.
7. Improper Battery Mounting Polarity
When batteries' positive (+) and negative (-) terminals are reversed with respect to the battery mounting's polarity marks, batteries may be discharged, depending on the type of electric circuit.
8. Conductive Materials to prevent Static Electricity
Various protective materials are used to prevent static electricity. Most of these protective materials consist of particular combinations of carbon, aluminum and other materials, for effective conductive performance. If the battery's positive (+) and negative (-) terminals touch these protective materials simultaneously, the battery may discharge.
9. Electrical characteristics after short-circuit
Coin Manganese Dioxide Lithium Batteries may require considerable time to regain its normal voltage even after a slight short-circuit.
When batteries are short-circuited, wait an adequate time for batteries to recover before measuring electrical characteristics. Use a high impedance (1MΩ or higher) voltmeter to measure battery voltage.
10. Avoid contact between battery lead plates
When batteries lead plates bend and touch each other or either terminal, batteries may short-circuit.
11. Solder Bridges
Solder may bridge between circuit board conductors, causing a short-circuit and draining batteries.
12. Short circuits due to soldering
Similar to solder bridging, when circuit board wiring is short-circuited by a soldering iron for an extended period, batteries may be drained and consumed.
Complete manual soldering within 5 seconds.

Interpretation of batteries in the European Directives

This product does not contain Mercury(Hg), Cadmium(Cd), nor Lead(Pb), and conforms to EC regulation values (Directive 2006/66/EC, 2013/56/EU).

RoHS directive & European Directives

Battery and battery pack are excluded from RoHS directive (DIRECTIVE 2011/65/EU OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL of 8 June 2011 on the restriction of the use of certain hazardous substances in electrical and electronic equipment).

LINK Interpretation of batteries in the European Directives

Best Management Practices for Perchlorate Materials

PDF Best Management Practices for Perchlorate Material

Regulations for the Transportation of Lithium Batteries

Coin Manganese Dioxide Lithium Battery is specified as Class 9 dangerous goods under UN No. 3090 (for battery only) and UN No. 3091 (for battery contained in equipment or packed with equipment).
For sea transportation, Coin Manganese Dioxide Lithium Batteries shipped from Sony factories comply with Special Provision 188, thus can be transported as exempt from the Class 9 dangerous goods category.
For more details, please refer to IMO IMDG Code (Dangerous Goods Regulations).

For air transportation, except small quantity shipment, pacels should be handled as Class 9 dangerous goods. Due to the amendment of Air Transportation Regulations, it is prohibited to transport by a passenger plane but is only allowed by a cargo flight.
For more details, please refer to IATA DGR latest Edition.

We also recommend to check with your forwarder in advance for proper shipping as each company may have their own rules.

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