Choosing the right battery for your smart device is not an easy task and depends on many parameters.
Not only does the battery need to be light and small-sized to fit into miniaturized designs, but also remain safe all over a long-life expectancy (thanks to good charge retention). Another crucial point for the battery is to be able to operate in a wide range of temperatures (for both indoor and outdoor usages) while offering a stable output voltage throughout the device’s lifetime.
Before going any further into which parameters to look at, let’s get back to basics: What are the various batteries available to us and what are their specificities?
There are two types of batteries: primary batteries that are single-use and secondary batteries that are rechargeable.
Both generate electricity through electrochemical reactions between two poles, positive (+) and negative (-), and thanks to an electrolyte (solution). Using various materials for the poles and different electrolyte compositions, we can make a huge variety of batteries with different properties and voltages. For example, alkaline batteries are widely found in shops and used in consumer products, lithium batteries, zinc-air batteries, silver-oxide batteries or a mix of these chemistries are examples of batteries available on the market.
Indeed, lithium batteries offer high performance and reliability, feature high voltage thanks to the use of lithium as anode, and deliver an amount of energy per volume that can be ten times more than that of zinc-oxide batteries. Its electrolyte contains no water, allowing for use at low temperatures, and some products with specific electrolytes can sustain high and even very high temperatures.
Lithium batteries come in various forms and sizes.
The result of more than one hundred years of research and innovation in the field of energy storage, our range of miniature lithium-based batteries has been specially designed for connected object (IoT) applications.
We offer 3 main ranges of batteries for IoT devices:
Saft’s LS, LSH and LSP cylindrical primary lithium cells ranges are based on Lithium-Thionyl chloride (Li-SOCl2) chemistry, which exhibits the highest nominal voltage among primary battery chemistries (3.6 V).
LS, LSH and LSP batteries have also the highest energy density and can restore it for up to 20 years. They are very sturdy and can withstand very high temperatures and strong vibrations.
Two types of lithium thionyl chloride cells are available: bobbin and spiral constructions.
The bobbin construction of the LS range makes these cells particularly well suited for applications requiring very low continuous or moderate pulsed currents such as metering devices or parking sensor applications.
Their ability to withstand broad fluctuations of pressure, temperature (from - 60°C to + 150°C) and harsh mechanical environments make the LS cells ideal for use in remote locations and extreme environments such as trackers. Combined with a pulse support such as a capacitor, super capacitor, EDLC (Electrochemical Double Layer Capacitor) or Hybrid capacitor, they can even sustain higher pulses and temperatures and combine “best of both worlds” performances.
That's why Saft’s launched a new range of primary solutions –the LSP– that combines reliable, low self-discharge Li-SOCl2 cell technology in parallel with a state-of-the art and carefully selected LiC (Lithium-ion Capacitor).
The LiC selected by Saft is showing the lowest self-discharge and ESR (Equivalent Series Resistance) at most temperatures and one of the highest measured capacitance during a pulse, ensuring that the LSP range will meet the lifetime of 10 years or more required by the new generation of connected devices. In a nutshell, the LSP range offers the best compromise between pulse sustaining capability, operating temperature range, and performance stability over lifetime.
The LSH range has a spiral construction. The cells are designed for applications requiring very high pulses. Some specific ranges can operate at the very high temperatures found in oil and gas applications, for example.
The Saft LM/M cylindrical primary lithium cells are based on lithium-manganese dioxide (Li-MnO2) chemistry – 3V.
LM/M cells have a spiral internal construction like LSH cells but exhibit a lower nominal voltage of 3.0 V vs. 3.6 V. If the electronic design of the application is allowing a cut-off voltage below 2.5 V, this range is probably one of the most economic options with a good trade-off between energy and power. LM/M range features high surface-area spiral electrodes for maximum current pulse capability and an electrolyte formulation for optimized operation from - 40°C to + 85°C.
Their good pulse capability makes them suitable for smart metering devices requiring high pulses, but also parking sensors and smart farming applications.
Saft medium prismatic MP and cylindrical small VL rechargeable cells are based on our unique lithium-ion technology. These batteries can be recharged and used again and again after discharge which makes them very convenient for devices that are frequently used. Saft MP and VL batteries boast very long cycle-life in harsh conditions, as they can be charged and discharged over a wide temperature range. Our lithium-ion batteries are equipped with specific safety features – electronic protection circuit, a built-in circuit breaker in case of a charger fault, shut-down separator, and safety vent - which makes them more expensive than most other batteries, but high cycle count (up to 2 800 times with only a 30% capacity loss) and low maintenance reduce the cost per cycle over many other chemistries. In addition, state-of-charge (SOC) and state-of-health (SOH) indicators may be selected as options to monitor your application. Saft’s Li-ion technologies offer unique performances in unregulated outdoor conditions or in extreme conditions, either hot or cold. They are therefore ideal for demanding applications in industrial and critical environments.
Below is a table of our battery ranges and the applications they can be used for:
As you will have understood by now, there is no simple answer to that question.
Here are the parameters you must consider when listing all the options for your use case:
Still confused about how to move forward with your choice? Why don’t you submit your use case’s consumption profile to our application engineers for a personalized recommendation?
By signing up, you’ll be the first to hear about our news and receive exclusive advices.
We use your email address solely for sending our IoT newsletter. You can unsubscribe at any time using the unsubscribe button at the bottom of the newsletter.
What are the ATEX directives and the IECEx conformity assessment system and why do you need batteries that comply with them? #Saft #ATEX #IECEx
We teamed up with our partner, Deutsche Telekom, to take a look into the implications of low-power design in battery selection. #Saft #Low-Power design #sensors
Digital Twins solutions such as Deutsche Telekom IoT Solution Optimizer can help in reducing the time to market and creating less defective devices. Miguel Rodriguez explains... #IoT #Internet of Things #digital twin
An IoT device management platform is a must for any successful IoT solution. Marcin Nagy, IoT Product Director at AVSystem discusses the challenges of scaling IoT solutions... #Cloud services #Data storage #Cloud management
In this article, we explores the various power options available and what what processes to apply when selecting a source of energy. #IoT #Internet of Things #Energy
How do you choose a good network connectivity solution for your IoT project? That’s the question we asked Barbara Pareglio, Executive Director for Connectivity at GSMA #IoT #Internet of Things #network
Wilfried Dron, CEO & Co-founder at Wisebatt shares his expert tips on how to optimize your IoT device's power consumption. #sensors #IoT #Internet of Things
Alexander Bufalino, VP Marketing, at Quectel Wireless Solutions explains how to navigate the issues and select the right technologies and partners for the long-haul #sensors #IoT #Internet of Things
The advent of the Internet of Things has given sensors the leeway they needed to develop. With a plethora of choices, how do we choose the best sensor? #sensors #IoT #Internet of Things
Maxime Schacht, former Head of Sigfox Hacking House, Sigfox’s innovation arm and now CEO of VizioSense, shares his insights about “how to create value for the end user”. #IoT #Internet of Things #value
G. Macaigne and F. Ott (LACROIX Electronics) share their views of the challenges that IIoT developers face today and how to approach, conceive and deploy a successful IoT project #IIoT #IoT #Internet of Things
In this article, we will give you some recommendations on how to choose the right connection; a solution that will last as long as your device is operating, without maintenance #Internet of Things #IoT #Battery