Power lithium battery VS capacity lithium battery, which is better

Power lithium-ion batteries need to consider more reliability and consistency. After all, it takes a long time(at least 5 to 10 years), harsh environment(low temperature in winter, exposure in summer, rain and snow), and a large number of battery strings. Considering reliability and consistency, suppose a car uses 1,000 power batteries. Ideally, the car manufacturer hopes that there will be no problem with the size of a 100,000 car. That is, ideally, the probability of a power battery problem(safety, storage, recycling, etc.) is less than one in 100 million(of course, for the most high-end consumer batteries, Apple also requires suppliers to reach this level). Given reliability, power batteries are generally designed to be more redundant, using thicker membranes, foil, and shells, so the energy density is about half that of consumer batteries.

Consumer lithium-ion batteries do not need to be reliable for a long time(the cycle does not need to be too good, because it will be changed in a year or two anyway), and generally do not need to be used alone, so there is not much requirement for consistency, but due to consumer mobile phones, pad space Limited and very precious, Therefore, consumer lithium ion batteries have high requirements for size, capacity, and energy density.

For safety, power batteries have more external protection circuits, heat dissipation layouts, etc.. Of course, they also face worse conditions(higher external voltage, greater current, more complex external environment), and consumer batteries are protected. Less, It is necessary to rely on the material and design of the battery to resist various safety situations on the basis of higher energy density.

I personally believe that high-end consumer batteries use the most advanced technologies and materials, while power batteries require more advanced process control, consistency control and quality management.

1. Different capacity, the power of the general large mobile phone and other electronic products of small capacity,

2. The cycle life power will also be higher

3. At the temperature control point, the power will have a protective temperature of the battery pack.

There are many types of lithium batteries, such as dynamic lithium batteries and volumetric lithium batteries. What is the difference between these two lithium batteries? Perhaps many people are not very clear, the following small editor to explain to you.

1, different voltage size

In the battery industry, the voltage increases, and the corresponding output voltage also increases, so that the power lithium battery can meet some high-power equipment; The direct effect of the parallel mode is to increase the current of the entire battery pack, and the capacity is affected by the current at the output end. Therefore, the direct effect of the parallel mode is to increase the capacity of the lithium battery pack, and the capacity of the battery pack connected in this way. It will often be relatively large. That is, the so-called volumetric lithium battery pack.

2, the application of different products

Some large equipment require a higher voltage value because low-power batteries are not functioning, so dynamic lithium batteries are selected. For example, when we use an electric bicycle, the voltage required by it is often 48V. Compared to some situations in our life, 48V is not small. Therefore, it is necessary to use dynamic lithium batteries to ensure the operation of electric bicycles. We usually go to some large supermarkets or shopping malls, some sign lights, and spare power supplies. Because the power consumption of these devices is not very large, we generally use volumetric lithium batteries, which are different in the application of the product.

3, internal resistance is different

The internal resistance of a powered lithium battery is smaller than that of a volumetric lithium battery. Taking 18650 as an example, a good manufacturer with a three-rate discharge usually has a PDC with an internal resistance of about 40; Five times the rate of discharge is generally not accompanied by PDC internal resistance of about 20.

It can not be simply evaluated, depending on the application area or application requirements.

For example, electric vehicles or electric bicycles, electric balance vehicles, and electric skateboards have large motor power, and the maximum operating current is generally equal to 1.5 to 3 times the battery capacity(called 1.5 to 3C in the industry). In this case, the power lithium battery is applicable, and the capacity lithium battery is not applicable. If lithium battery capacity is applied, there will be severe fever and a short service life.

In digital applications such as mobile phones and PADs, the power is small, the size is small, and the size of the battery is higher. This low power and high energy application is more suitable for capacity lithium batteries. Although the power lithium battery can be applied to this kind of situation simply from the performance, but to achieve the same capacity, the volume and weight must be larger than the capacity type, and the cost is higher.

In short, the power lithium battery and the capacity lithium battery are suitable for different occasions.

The page contains the contents of the machine translation.