Материал: fanso-cr2450
WUHAN FANSO TECHNOLOGY CO.,LTD.
6. Precautions
●Precautions in Designing
To use the battery efficiently, observe the following precautions.
1. Confirm the standard discharge current surely when batteries are used.
This battery is not for heavy loading discharge.
Model |
Standard discharge current |
|
|
CR1025 |
0.1mA |
CR1220 |
0.1mA |
CR1620 |
0.1mA |
CR1632 |
0.2mA |
CR2016 |
0.1mA |
CR2025 |
0.2mA |
CR2032 |
0.2mA |
CR2354 |
0.4mA |
CR2430 |
0.2mA |
CR2450 |
0.4mA |
CR2477 |
0.6mA |
CR3032 |
0.4mA |
2. Usage as main power source (1)Selection of battery
Select the most appropriate battery considering the electric property of equipment.
(2)A number of use batteries and usage
Keep under 3 batteries to use for Lithium coin battery.
Do not mix any different brands when some batteries are used together.
Set in a battery charge protection equipment when it is used connecting in parallel.
3
(3)Circuit design
Set apart battery circuit from other power circuits. Set in a fuse or something safe parts in a circuit
3. Use as auxiliary power (1)Circuit design
Keep the circuit individually preventing being charged or forced discharge by main power source.
(2)Circuit design ( for back-up memory) ( )
Set up a Diode and protection circuit to prevent being charged to a battery when a battery is connected to main power source circuit.
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WUHAN FANSO TECHNOLOGY CO.,LTD.
■Precautions in Designing a Memory Backup Circuit
A primary lithium battery is 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 over discharging can occur.
Allowable Range of Diode Back-Leakage Current
To prevent the battery from being charged by the main power source, be sure to use a backcurrent 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 1% of the nominal battery capacity over the total period of
use. ) ( 1%
Backup Circuit Example
■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.
管失效时最大允许充电电流
Model |
Maximum allowable charging current |
|
|
CR1025 |
2.5mA |
CR1220 |
2.5mA |
CR1620 |
2.5mA |
CR1632 |
2.5mA |
CR2016 |
10mA |
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|
|
WUHAN FANSO TECHNOLOGY CO.,LTD. |
|
|
|
CR2025 |
10mA |
|
|
|
CR2032 |
10mA |
|
|
|
CR2354 |
10mA |
|
|
|
CR2430 |
15mA |
|
|
|
CR2450 |
15mA |
|
|
|
CR2477 |
15mA |
|
|
|
CR3032 |
15mA |
|
|
How to Calculate Protection Resistance R R Protection resistance R must exceed the value calculated in the following formula:
R
R
V(M ain pow er source voltage)
I(M axim um allow able charge current per battery)
In this equation, the worst-case battery voltage (0) is assumed.
4. Battery holder and battery chamber
(1)Design a battery chamber which the electric is not connected when a battery was reversed. Describe the correct loading direction of battery surely and indelibly on a battery chamber.
(2)Design a battery chamber which other size batteries can not be inserted or connected.
(3)Design a battery chamber which is outgassed easily. (4)Design a battery chamber preventing water entering. (5)Add the feature of explosion protection to a battery chamber when it is sealed.
(6)Set a battery chamber apart from heat source equipment.
(7)Design a battery chamber which children can not pull out easily.
5. Interface and terminal
(1)Make sufficient quality and shape for electric connection.
(2)Design an attached circuit which prevents the batteries reversed.
(3)Shape the battery preventing from being reversed. (4)Do not solder or weld to batteries directly.
6. List the precautions (1)Main body
Specify the loading direction of battery on battery chamber.
(2)Manual
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WUHAN FANSO TECHNOLOGY CO.,LTD.
List the precautions how to handle batteries.
7.Do not solder the battery directly. Excessive heating may cause deformation of the battery components such as the gasket, which may lead to the battery swelling, leakage, explosion or ignition.
8.Observe the soldering condition for the tabbed battery to be specified by the manufacturer. Choose the tabbed battery if soldering is required.
Excessive heating may cause deformation of the gasket, leakage or performance deterioration of the battery. Assure not to exceed the battery temperature higher than70 at soldering.
70
9.Use nickel-plated iron or stainless steel for the terminals that contact the battery.
10.Make sure that terminal contact pressure is 100g minimum for stable contact.
100g
11.Keep the battery contact terminal surfaces clean and free from moisture and foreign matter.
12.Before inserting the battery, check the battery contact terminals to make sure they are normal, not bent or damaged. Bent terminals may not make good contact with the battery or may cause it to short-circuit.
13.Do not overdischarge the battery lower than 0V. It may lead to reversed polarity and cause ignition, heating, leakage or explosion.
0V
14. Lithium Manganese Dioxide Battery that is almost exhausted still maintains high output voltage that is almost the same as that of a fresh battery. Avoid using a mixture of old and
new batteries; replace all batteries in a set with new ones. -
15.Lithium Manganese Dioxide Battery requires considerable time to regain their normal voltage after even a slight short-circuit. Therefore, should the battery be short-circuited, wait an adequate time for the battery to recover before measuring its electrical characteristics.
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16.Use a high impedance (1MΩ or higher) voltmeter to measure battery voltage.
(1MΩ or )
17.Battery characteristics vary with type and grade, even when batteries are the same size and shape. When replacing batteries with new ones, be sure to carefully check the symbols and
numbers on each battery.
18.Please design equipment so that infants cannot easily remove batteries and swallow them.
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WUHAN FANSO TECHNOLOGY CO.,LTD.
19. Consult the sales representative, when series or parallel connection of several batteries is required.
●Precautions for Mounting
Unlike other electronic components, Lithium Manganese Dioxide Battery(Coin-type) may be externally short-circuited before and after it is installed in circuit boards and without the power being turned on. This causes power drainage. As a result, the battery may lose its capacity before the equipment is even used. As short-circuits tend to occur in the following cases, please take care when handling the battery.
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1.Overlapping Batteries
Lithium Manganese Dioxide Battery is shaped as shown below. It has exposed positive(+)and negative(-) metallic surfaces with a thin cylindrical seal, called the gasket, inbetween them. When the batteries are overlapped or mixed together in a disorderly way, their positive(+)and negative(-)terminals touch each other, causing short-circuits. -
(+) (-)
(-)Negative terminal
Gasket
(+)Positive terminal
2.The Batteries Put in a Metallic Container or on a Metallic Plate
Similar to the overlapping battery problem, when the batteries are put in a metallic container or on a metallic plate, their positive(+)and negative(-)terminals may short-circuit through the conductive surface, depending on how the batteries are position.
(+) (-)
3.When The Battery is Held with Metallic Tweezers
When held with a pair of metallic tweezers as shown, the battery short-circuits through the tweezers.
4.When The Battery Lead Plates Touch Each Other
When the battery lead plates bend and touch each other or other either terminal, the battery short-circuits.
5.Solder Bridges
Solder may bridge between circuit board conductors, causing a short-circuit and draining the battery.
6.Short-circuits through Soldering Irons
Similar to solder bridging, when the circuit board wiring is short-circuited by a soldering iron for an extended period the battery is drained and consumed. Complete short-circuits through
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