lithium battery

Since they offer a high energy density, a long lifespan, along with a low self-discharge rate, lithium batteries have grown in popularity. Particularly, 72V 40Ah lithium batteries have a few distinctive characteristics that make them suitable for a variety of applications. Here are 5 key benefits of using a 72v 40ah lithium battery:

  • High Discharge Rate

Lithium ion batteries have a higher energy density than other kinds of rechargeable batteries.Β  This suggests that they might be capable to store more energy in the available volume. A lithium ion battery is explicitly referred to as a “72V 40Ah battery” if it has a 40 ampere-hour capacity and a 72 volt voltage. The battery can deliver an extended high discharge current when required thanks to its high voltage and capacity without being damaged or overheated. Voltage dictates how much power is capable of being produced; capacity affects how long that power output can be maintained.

The amount of power or current that can be constantly extracted from the battery is measured as the discharge rate. The safe discharge rate for numerous lithium ion batteries is up to 1C or 1-2C.Β  This means discharging the full rated capacity in 1 hour or 30 minutes respectively. For a 72V 40Ah battery, 1C rate would be 40A discharge current. However, many modern lithium batteries can handle discharge rates of 2C or 3C as well. So a 72V 40Ah lithium battery can potentially deliver 80A to 120A continuous discharge current without issues.

  • Long LifespanΒ 

Lithium ion batteries often have a much longer lifespan than lead acid or NiMH batteries. The benefit of lithium ion chemistry’s lifetime is due to a few factors. First off, throughout charging and discharging cycles, lithium ion batteries seldom degrade or lose any capacity. After being cycled more than 2000 times, a lithium ion battery typically maintains around 80% of its initial maximum capacity. In comparison, a lead acid battery generally lasts only 200-300 cycles before needing replacement.

Secondly, lithium ion cells have lower internal resistance than other battery types. This internal resistance affects how efficiently current flows through the battery. Lower internal resistance allows the battery to charge and discharge more efficiently. It also results in less heat being generated during these processes. Less heat generation has a big impact on lifespan. Exposure to heat accelerates the aging of battery components leading to faster deterioration. Lithium ion batteries stay cooler during operation due to their lower internal resistance. This slower aging process allows them to last for thousands of cycles.

  • Low Weight

When comparing to lead acid batteries of comparable capacity, lithium ion batteries’ low weight is one of their main practical benefits. This is because lithium ion batteries can store more Wh of energy per kg of battery weight because to their significantly greater energy density. For example, a typical lithium ion battery may have a gravimetric energy density of 100-265 Wh/kg. In comparison, lead acid batteries top out at around 30-50 Wh/kg.

This difference is very apparent when comparing real world battery packs. A 60v 30ah lithium battery would weigh between 15-20 lbs. But an equivalent capacity lead acid battery of the same voltage and capacity ratings would be in the 60-100 lbs range, 3 to 5 times heavier! The lighter weight of lithium ion batteries delivers some tangible benefits especially for electric vehicle applications where battery weight affects overall vehicle performance and efficiency.

  • Faster Charging

Lithium ion batteries can generally be charged faster than other rechargeable battery types like lead acid or NiMH. This is because lithium ion chemistry allows higher charge C-rates to be used safely. The C-rate represents the speed of charging relative to total battery capacity.

Specifically, most lithium ion batteries can tolerate charge rates between 0.7C and 1C, sometimes up to 2C rates with the proper supporting electronics. This means a 72V 40Ah lithium battery could potentially be fully recharged in 1-2 hours using an appropriate high-power charger designed for rapid charging.

In comparison, lead acid batteries take much longer to charge fully – usually 6-8 hours on average. Rapid charging significantly above 0.3C rates can also damage lead acid batteries, limiting their fast charging capability. The ability to recharge in 1-2 hours versus 6-8 hours allows lithium ion batteries to minimize downtime. It enables convenient recharging during breaks or downtime within a normal usage schedule. Fast charging rates also improve productivity by maximizing operating time versus time spent recharging.

  • Low Self-Discharge

In contrast to various other rechargeable battery types, lithium-ion batteries exhibit an exceptionally minimal self-discharge rate. Self-discharge denotes the gradual depletion of charge transpiring when a battery remains idle. Even when unused, lead acid batteries may lose 5–10% of their capacity per month.Β  This capacity loss requires regular charging to maintain charge levels, even if the battery is unused.

On another hand, lithium ion batteries retain their charge significantly better when they are put away. For instance, a 72V 40Ah lithium-ion battery will still have more than 90% of its full capacity after three months of unused storage at ambient temperature. 1-2% each month is the predicted self-discharge rate.Β  Minimal capacity loss when inactive is attributed to lithium ion batteries having lower internal resistance and less side reactions compared to lead acid. This means the stored energy dissipates slower.

The low self-discharge rate allows lithium batteries to hold most of their charge when left unused for extended periods. Infrequently used equipment will be ready to use when needed. Additionally, less charging maintenance is required for standby or backup batteries. Wastage is also reduced since less stored energy is lost while in storage.

Conclusion

Compared to other battery chemistries, 72V 40Ah lithium batteries from Likraft have significant benefits in terms of power supply, durability, weight, and charging speed, as well as self-discharge rates. They are very beneficial for electric vehicles, motorbikes, power tools, renewable energy storage, and many other applications because to their high discharge capacities, long-lasting performance, lightweight design, quick charging, and minimum self-discharge. As lithium battery costs continue to decrease, they are becoming increasingly viable options for replacing lead acid and NiMH batteries across a wide range of uses.

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