Blog - Others

Our 10 years of Lithium Iron Phosphate experience shared within thousands of articles, hundrends of tests and examples.

21.06.2019
 
Starting with LYP/LFP cells from Winston Battery - 13 steps

Quick tutorial video how to start with the LFP (LYP) cells. Learn and see the 13 steps. See how to make the first check-up and the initial charging. About Winston cells: Large capacity LiFePO4 prismatic cells. Thundersky – Winston Battery famous yellow cells. More than 18 years on the market. Thousands of satisfied customers. Easy assembly using the large screw terminals. Performance 10000 cycles. Warranty 10 years. Life-span 30 years. Simple. Safe. Secure.

About GWL: GWL/Power is the European distributor for Thundersky - Winston Battery cells. Quick delivery for the cells to all of Europe and also around the world. GWL/Power provides support and solutions for DC power systems. Large warehouse in the center of Europe. Fast shipping in 2 to 3 days.

Links and References Winston cells:

Terminal connectors:


https://www.ev-power.eu/Winston-40Ah-...
https://www.ev-power.eu/Winston-termi...
   more...

21.06.2019
 
BU-808b: What Causes Li-ion to Die?

Blog EVPower

Learn what‘s behind the aging process of Li-ion

Source:

The ultimate focus of maximizing the energy density of Li-ion shifted in 2006 when Li-ion unexpectedly disassembled in consumer products and millions of packs were recalled. Safety gained attention and batteries became safer. With the advent of the electric vehicle (EV), longevity is moving to the forefront and experts have begun exploring why batteries fail.

While a 3-year battery life with 500 cycles is acceptable for laptops and mobile phones, the mandated 8-year life of an EV battery seems long at first. However, it still makes an EV buyer cringe when learning that a replacement battery carries the price of a compact car with an internal combustion engine. If the life of the battery could be extended to, say, 20 years, then driving an EV would be justified even if the initial investment is high.

Manufacturers of electric vehicles choose battery systems that are optimized for longevity rather than high specific energy. These batteries are normally larger and heavier than those used in consumer goods.

Batteries chosen for an electric powertrain go through strenuous life cycle testing and Nissan selected a manganese-based Li-ion for the Leaf EV because of solid performance. To beat the clock, the test protocol mandated a rapid charge of 1.5C (less
https://batteryuniversity.com/learn/article/bu_808b_what_causes_li_ion_to_die

   more...

21.06.2019
 
BU-304a: Safety Concerns with Li-ion

Source:

Learn what causes Li-ion to fail and what to do in case of fire.

Safety of lithium-based batteries has attracted much media and legal attention. Any energy storage device carries a risk, as demonstrated in the 1800s when steam engines exploded and people got hurt. Carrying highly flammable gasoline in cars was a hot topic in the early 1900s. All batteries carry a safety risk, and battery makers are obligated to meet safety requirements; less reputable firms are knowns to make shortcuts and it’s “buyer beware!”

Lithium-ion is safe but with millions of consumers using batteries, failures are bound to happen. In 2006, a one-in-200,000 breakdown triggered a recall of almost six million lithium-ion packs. Sony, the maker of the lithium-ion cells in question, points out that on rare occasion microscopic metal particles may come into contact with other parts of the battery cell, leading to a short circuit within the cell.

Battery manufacturers strive to minimize the presence of metallic particles. The semiconductor industry has spent billions of dollars to find ways in reducing particles that reduce the yield in wafers. Advanced cleanrooms are Class 10 in which 10,000 particles larger than 0.1µm per cubic meter are present (ISO 4 under ISO 14644 and ISO 14698). In spite of this high cleanliness, particle defects still occur in semiconductor wafers. Class 10 reduces the particles count but does not fully
https://batteryuniversity.com/learn/article/safety_concerns_with_li_ion

   more...

21.06.2019
 
Batteries: Lithium-ion vs AGM

Blog EVPower
Source:

Across all markets over recent years Lithium-ion batteries have been gaining in traction [sic]. To the uninitiated it is easy to dismiss Lithium-ion as an expensive alternative to VRLA (valve regulated lead acid) technologies such as AGM (absorbed glass mat), if simply looking at the amp-hour (Ah) rating. This was the initial mistake I made a few years back. Digging deeper it became clear to me that there is a lot more than Ah ratings to consider, when choosing the best batteries for your application.

In the marine world (which is where I have the most experience) the choice these days and especially with higher loads – often simply comes down to Lithium-ion vs AGM. In the comparisons below whilst Gel batteries are shown, they do have a lower effective capacity at high discharge currents. They cost about the same as AGMs, assuming both types are monoblocs, as opposed to 2 V long life gel cells. Wet cell or flooded lead acid (FLA) batteries whilst referred to are not considered for the crux of this particular comparison, primarily due to maintenance and safety considerations in the marine environment. This of course may not apply to other markets.


https://www.victronenergy.com/blog/2015/03/30/batteries-lithium-ion-vs-agm/
   more...

21.06.2019
 
What’s inside an 18650 cell? And why its important

Blog EVPower

Source:

There has been a boom in ebike builders making their own battery packs out of the popular 18650-format cells (18mm diameter, 65mm long), and I want to share what I’ve found out about the guts of an 18650, so you will understand more about proper DIY pack-building methods.


Why would somebody make their own pack?

The existing battery pack vendors will only make (and stock) the packs that they think they will sell enough of, to make it worth risking their available cash. Which means, they will only have packs with certain particular sizes, shapes, and with specific cost-effective cells.

   more...

20.06.2019
 
BU-205: Types of Lithium-ion

Become familiar with the many different types of lithium-ion batteries.

Source:

Lithium-ion is named for its active materials; the words are either written in full or shortened by their chemical symbols. A series of letters and numbers strung together can be hard to remember and even harder to pronounce, and battery chemistries are also identified in abbreviated letters.

For example, lithium cobalt oxide, one of the most common Li-ions, has the chemical symbols LiCoO2and the abbreviation LCO. For reasons of simplicity, the short form Li-cobalt can also be used for this battery. Cobalt is the main active material that gives this battery character. Other Li-ion chemistries are given similar short-form names. This section lists six of the most common Li-ions. All readings are average estimates at time of writing.

Lithium Cobalt Oxide(LiCoO2)

Its high specific energy makes Li-cobalt the popular choice for mobile phones, laptops and digital cameras. The battery consists of a cobalt oxide cathode and a graphite carbon anode. The cathode has a layered structure and during discharge, lithium ions move from the anode to the cathode. The flow reverses on charge. The drawback of Li-cobalt is a relatively short life span, low thermal stability and limited load capabilities (specific power). Figure 1 illustrates the structure.


https://batteryuniversity.com/learn/article/types_of_lithium_ion
   more...

20.06.2019
 
Characteristics of Lead Acid Batteries

Source:

For most renewable energy systems, the most important battery characteristics are the battery lifetime, the depth of discharge and the maintenance requirements of the battery. This set of parameters and their inter-relationship with charging regimes, temperature and age are described below.

Depth of Discharge and Battery Capacity

The depth of discharge in conjunction with the battery capacity is a fundamental parameter in the design of a battery bank for a PV system, as the energy which can be extracted from the battery is found by multiplying the battery capacity by the depth of discharge. Batteries are rated either as deep-cycle or shallow-cycle batteries. A deep-cycle battery will have depth of discharge greater than 50%, and may go as high as 80%. To achieve the same useable capacity, a shallow-cycle battery bank must have a larger capacity than a deep-cycle battery bank.

In addition to the depth of discharge and rated battery capacity, the instantaneous or available battery capacity is strongly affected by the discharge rate of the battery and the operating temperature of the battery. Battery capacity falls by about 1% per degree below about 20°C. However, high temperatures are not ideal for batteries either as these accelerate aging, self-discharge and electrolyte usage. The graph below shows the impact of battery temperature and discharge rate on the capacity of the battery.


https://www.pveducation.org/pvcdrom/lead-acid-batteries/characteristics-of-lead-acid-batteries
   more...

10.06.2019
 
Why use LiFePO4 batteries to start internal combustion engines?

Demonstration of Lithium Iron Phosphate (LiFePO4) battery used in an ultra-lightweight airplane.

When choosing a starter battery for your caravan, boat or aircraft, you want it to be reliable. To start the engine even when the battery has not been recharged for a long time and when it is really cold. In short, so you don’t have to worry about the battery.

Check the showcased battery on our e-shop -

More 12V batteries and other goods are also on our e-shop: (www.gwl.eu)


https://www.ev-power.eu/LiFeYPO4-batt..
.
https://www.ev-power.eu/
   more...

10.06.2019
 
GWL Answers: Choosing your Energy Storage System (Battery)

GWL Answers: a series of questions and answers to most common topics related to batteries.

Important choice to make, do you purchase all-in-one solution for the simplicity and loose the control or use open system to remain in control of your battery?

Want to know more? Visit us online:


https://www.ev-power.eu
   more...

10.06.2019
 
GWL Answers: Choosing battery capacity for family home

GWL Answers: a series of questions and answers to most common topics related to batteries.

The choice of optimal battery size for home installation with Solar system (Photovoltaic) is often critical but also difficult. In the video, we will not calculate it precisely for you, but give idea how to approach this decision.

Want to know more? Visit us online:


https://www.ev-power.eu
   more...

13 visitors online.
All Rights reserved © 2019 GWL a.s.