Detailed graphic analysis of the characteristics and application of Murata coin-type manganese dioxide lithium battery

Murata's coin-type manganese dioxide lithium battery (CR battery) is a small primary battery using manganese dioxide for the positive electrode and lithium for the negative electrode. It is widely used in automotive-related equipment such as smart entry systems and TPMS (Tire Pressure Monitoring System), IoT-related equipment, and storage backup power supplies.

Lightweight, high voltage, high energy density: The battery voltage is 3V, which is about 2 times that of the dry battery. Two batteries have been required so far, and now one battery can be used, saving space and achieving weight reduction.

Superior discharge stability: Even when it is discharged for a long time, it can display stable voltage characteristics, so it can improve the reliability of the equipment used and save the maintenance of battery replacement.

Wide operating temperature range: The use of a unique organic electrolyte makes it superior in the low to high temperature range.

・-30°C to +70°C (standard type) -40°C to +125°C (heat-resistant type)

Superior liquid leakage resistance: By using the newly developed battery construction and electrolyte, it has excellent liquid leakage resistance for a long time.

Superior preservation characteristics: Active substances and electrolytes have the characteristics of high self-discharge by selecting materials with high stability and unique packaging technology. The self-discharge amount in the environment of normal temperature and normal humidity with respect to the nominal capacity is less than 1%.

UL component certified products: Murata's coin-type manganese dioxide lithium battery is a UL component certified product. (UL1642 File No. MH12566)

EU Battery Directive and RoHS Directive

This battery does not contain three substances (mercury, cadmium, lead) specified in the EU Battery Directive and meets this standard.

This battery is outside the scope of the RoHS directive.

1

Series product lineup

■Standard (nominal voltage: 3V, operating temperature range: -30°C to 70°C)

* Nominal capacity refers to the capacity when discharging under standard discharge current conditions. (Temperature: 23 ° C, termination voltage: 2.0 V) * The value recorded here is not a guaranteed value.

If you would like to know the batteries, special shapes and special specifications of the specifications in this specification sheet, please do not hesitate to contact us.

2

CR list product lineup

List shape list

We have products with specifications, list specifications, and insulated hose specifications that are not published in the product lineup. Please consult us for details.

Relationship between discharge current and discharge life

3

principle

The positive electrode (positive electrode) active material is specially treated manganese dioxide (MnO2), and the negative electrode (negative electrode) active material is made of high-voltage, high-activity lithium metal. Further, the organic solvent in the electrolytic solution uses a substance capable of dissolving a lithium salt, and is as easy as possible to generate high voltage and high energy.

The discharge response of the battery is:

The discharge voltage is shown to be about 3V, the battery voltage is extremely stable and the impedance during discharge is low.

Example of post-storage discharge characteristics CR2025

As shown in the figure, the discharge characteristics after storage at 60 ° C for 100 days (corresponding to 5 years under normal temperature and normal humidity).

The preservation features are extremely advantageous.

There is almost no change in the discharge voltage and duration after storage.

Cross-sectional structure