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The main advantages of energy density and power tool lithium battery technology?

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The main advantages of energy density and power tool lithium battery technology?

Release date:2017-12-25 Author: Click:

The main advantage of energy density and power tool lithium battery technology is its significant increase in energy density. With the same volume and weight, lithium-ion batteries can store and release higher energy than other rechargeable batteries. Energy density is measured in two ways: volume and mass. Lithium ion technology can now provide a volumetric energy density of nearly 500 Wh/L and a mass energy density of 200 Wh. Lithium ions release more energy than other technologies, and they are smaller and lighter. Lithium-ion batteries have higher operating voltages than other rechargeable batteries, typically about 3.7V, while NiCd or NiMH batteries have 1.2V. This means that if you need to use more than one section of other batteries, only one lithium-ion battery is required to meet the requirements. The higher the battery energy density used in the design of portable instruments, the smaller the volume of the product and the better the portability. The reduction in battery pack size means that engineers can use extra space to add more new features to the same product. Rechargeable battery capacity will continue to lose. This phenomenon is called self-discharge. However, if it is properly stored, most of its lost capacity can still be restored.

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All batteries should be stored at room temperature (25°C or lower) to maintain maximum battery capacity. End-users must store SLA batteries at a low temperature and try to charge as close as possible to 100% of their capacity to maintain optimal performance. Sealed lead batteries have a self-discharge capacity of approximately 20% after being placed at 25°C for 6 months, but this value increases to approximately 30% after 6 months at 40°C. NiMH batteries should also follow similar recommendations to avoid long-term storage and deactivation of reactants. When NiCd and NiMH batteries were left at 25°C for 1 month, their self-discharge rate was about 20%, and then the rate of self-discharge rate slowed down significantly.


On the contrary, the best cycle life is obtained when the charge capacity of the lithium ion battery is 30-50%. Lithium-ion batteries have a self-discharge capacity of only 10% after storage for 6 months at 25°C. When selecting the material for rate characteristics, the inrush current and maximum discharge rate of the terminal device should be taken into account. Discharging batteries or battery packs at high rates can cause voltage drops. If this is not taken into account in the design, the terminal device may be turned off due to insufficient voltage. The continuous discharge rate of high-rate NiCd batteries can reach 2C (twice the rated capacity of the battery) or even higher, depending on the raw material of the battery and the internal impedance. The continuous discharge rate of many SLA batteries can reach 3C or even higher. Most of the continuous discharge rate of lithium-ion battery is only 1C, but the new battery using this technology, its continuous discharge rate is extremely high, up to 80A, sustainable for 30 seconds, in the competition with NiCd and SLA battery has a great Advantage.


Cycle Life The cycle life of a battery is the number of charge and discharge cycles the battery experiences before the battery capacity drops to a specified percentage of its original capacity. Lead-acid batteries have a cycle life of approximately 250 to 500 cycles, depending on the manufacturer's product quality and depth of discharge (discharge capacity up to 60% of rated capacity). NiCd, NiMH, and lithium-ion batteries typically withstand 500-700 charge and discharge cycles, and their capacity drops only to 80% of their rated capacity. Regardless of the chemistry used, the deeper the battery discharges, the less cycles users can use. Charging Differences Lithium-ion batteries are charged differently than other batteries. The SLA battery is preferably charged at a constant voltage, typically at a rate of 1/10 (C/10) of the rated capacity, with a charging time of 14-16 hours, or trickle charge or float charge.

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