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Due to the continuous development of technology, there are two types of lithium batteries in the battery market: power type lithium batteries and energy storage type lithium batteries. What the editor is going to talk about today is the lithium battery of electric forklifts. The working environment of forklifts varies, and the required tonnage also varies. So, how do we calculate the capacity and volume of lithium batteries? Hebei New Power editor will give you an answer.

How to calculate the capacity and volume of lithium batteries?

The automotive bus industry also uses a large amount of lithium iron phosphate, and its procurement standard is based on the amount of electricity in the battery pack - watt hours. For example, its demand will specify 240KWh of electricity, with a voltage of 600V. The remaining number and capacity of battery strings need to be communicated between both parties. This is also one of the current technical solutions based on capacity calculation.

Perhaps all the leaders are still confused after reading it. How many strings are suitable for me to choose? This also requires us to have a thorough understanding of the battery capacity.

A、 What is the capacity of a lithium battery?

The capacity of a single lithium battery generally refers to charging at a constant current of 0.5C to 3.65V, and charging at a constant voltage until the current drops to 0.01C in an environment with a temperature of 25 ± 2 ℃ and a humidity of (65 ± 20)% RH; When the power lithium battery cell is discharged at a current of 0.5C or 1C, the battery can store ampere hours or watt hours, and the capacity range allows a deviation of ± 3%.

B、 The following is the key section. How to calculate the capacity of a lithium battery pack?

In fact, a lithium battery pack is a battery pack in which multiple individual batteries are connected in parallel to expand their capacity and then connected in series to increase voltage. However, the number of connected batteries determines the entire storage capacity of the battery pack. We take 48V400AH as an example: 1) The nominal capacity and wattage of a 15 series lithium iron phosphate battery pack: 15 * 3.2V * 400AH=48V * 400=19.2WH;

2) The nominal capacity and wattage of a 16 string lithium iron phosphate battery pack: 16 * 3.2V * 400AH=51.2V * 400AH=20.48WH;

Now all the leaders understand that they are all so-called 48V400AH lithium iron battery packs, with a difference of 6% (1.28 kWh) in power. This is reflected in the price for lithium battery supply.

So, before putting the lithium battery into your shopping cart, asking about the number of lithium battery strings before negotiating the price is a * step for you to start using lithium batteries.

C、 As for the impact of voltage attenuation on vehicle power in the application of 15 series and 16 series, everyone can naturally calculate it by using a calculator. For 15 series of lithium iron, the discharge cut-off voltage is 42V when calculated as a low battery alarm based on a single unit voltage of 2.8V. This voltage is basically slow for forklifts. And the 16 series of iron lithium, also calculated based on 2.8V single cell voltage protection, has a discharge cut-off voltage of 44.8V. In this way, the forklift driver feels that the 16 string battery pack has strong power, energy, and long working hours. The power of the 15 strings is soft, and the natural working time is also relatively short.

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