Product Description

 

The main power supply unit is the primary source of power for the PLC and its components. However, the PLC also has a battery backup system that ensures uninterrupted operation even during power outages or maintenance-related power isolation. The battery is usually charged by the main power supply unit and is directly connected to the PLC CPU board. The backup battery provides power to the EPROM, which stores PLC configuration settings, Real-Time clock, logic, and process set points.
The battery in the PLC memory is known as the CMOS battery, backup battery, RTC battery, processor battery, or RAM memory battery. The main purpose of the battery is to supply power to the processor's non-volatile memory, which retains the content in case of power outages or when the machine is shut down for maintenance or relocation.
Therefore, the PLC battery is a critical component of the PLC system that provides continuous power supply to ensure smooth and uninterrupted operation. The CMOS battery plays a crucial role in retaining the processor's memory content, allowing for swift restoration after a power outage or maintenance-related power isolation.

 

Regular maintenance and checks of PLC batteries are essential to prevent any loss of memory or programmed software logic during power outages. PLC batteries can vary in their composition, with some utilizing a capacitor assembly while others rely on lithium batteries. In the case of a capacitor assembly, power failure will not result in data loss as the current memory values are automatically backed up. This ensures that when power is restored, the PLC returns to operation mode with the exact program values and configuration that were present before the power loss. The capacitor assembly typically has a backup duration of up to 72 hours. On the other hand, a PLC equipped with a lithium battery assembly offers a longer backup duration, up to 5 years. The lithium battery provides a secure backup for the memory data. It is crucial to note that PLC batteries play a key role in safeguarding the memory and programming integrity of the system during power disruptions. Therefore, regular voltage checks and maintenance should be conducted to ensure that the batteries operate within the recommended values. This proactive approach ensures the reliability and stability of the PLC system.

 

Common Types of PLC Batteries

PLC systems typically rely on Lithium-ion or Lithium batteries for power backup. Lithium-Thionyl Chloride batteries are a popular choice for this application, thanks to their low current usage and long lifespan. To achieve higher voltages, multiple batteries can be connected in series, although the most common voltage options are 3.0 VDC and 3.6 VDC. Of these, 3.6V lithium PLC backup batteries and 3.0V lithium coin cell batteries are the most prevalent options.

 

Advantages

 

The PLC memory battery is remarkable for its small size and high power output compared to other battery types. Secondary batteries that are rechargeable and can be used repeatedly include nickel-metal hydride batteries, nickel-cadmium batteries, and lead-acid batteries. However, lithium-ion batteries have a distinct advantage over these types in terms of being compact, lightweight, and yet very powerful. Moreover, lithium-ion batteries are highly durable and resistant to repeated charging and discharging, thanks to the lack of chemical reactions involved in their energy production. This means that lithium-ion batteries suffer less electrode degradation, which allows for optimal performance over time.

 

One of the key benefits of lithium-ion batteries is their ability to charge quickly, but this isn't exclusive to them. Other types of secondary batteries can also charge quickly, such as nickel-metal hydride batteries and nickel-cadmium batteries. The issue with these other battery types is that it's harder to determine when charging is complete, which made fast charging impractical. However, the charging process for lithium-ion batteries is much smoother, as the charger is able to detect when the battery is fully charged. This is why fast charging has become more commonplace with lithium-ion batteries.

 

 

Product Specifications

 

Our lithium battery ER14335 has the following specifications:

 

- Nominal voltage: 3.6V

- Nominal capacity: 1650mAh

- Max continuous discharge current: 100mA

- Max pulse discharge current: 200mA

- Operating temperature range: -40 to 85℃

 

Electrical Characteristics

 

Model	ER14335
Nominal voltage	3.6V
Nominal capacity	1650mAh (At 1.3 mA, +25 C, 2.0V cut off. The capacity restored by the cell varies according to current drain, temperature, and cut-off voltage )
Max. continuous current	40mA (To get 50% of the nominal capacity at +25℃ with 2.0V cut-off. Higher currents possible)
Max. pulse current	80mA (80 mA/0.1-second pulses, drained every 2 minutes at +20℃ from undischarged cells with 10 μA base current, yield voltage readings above 3.0V. )
Operating temperature range	-60℃~+85℃
Weight	Approx. 13g
Storage temperature	Max. 30℃
Shape	2/3AA
Dimension(max.)	14.5*33.5mm(Diameter*Height)
Battery type	Bobbin Type
Electrolyte/Chemistry	Lithium Thionyl Chloride(Li-SOCl2)
Brand	Ruizhi, Beleader, OEM acceptable

http://www.ruizhibatteries.com/