Energy storage battery pack heating

What is the preheating process of a battery pack?

At the beginning of the test, the temperature of battery pack and the temperature in the battery box are both stabilized at – 40 °C. The same preheating process is performed according to the proposed strategy in the eight tests, and then two different test cycles are loaded on battery pack during the holding process.

How does a battery thermal management system work?

In terms of battery thermal management systems, PCMs are incorporated into battery packs to absorb and dissipate surplus heat produced during use . When there is a rise in battery temperature, PCM absorbs this generated heat and undergoes a phase transition from solid state to liquid through which the thermal (heat) energy is stored.

What is battery heating?

The battery heating process is also included in the battery thermal management system. The best battery heating design must meet two goals: heating the battery in the shortest time possible and maintaining the temperature uniformity of the battery.

What are the electrical and thermal behaviors of battery pack?

Both the electrical and thermal behaviors of battery pack are described based on equivalent circuit models, and the state-of-charge and state-of-power of battery pack are co-estimated online to support the implementation of the strategy.

What is a battery heating strategy?

The strategy aims to strike a good balance between rapid heating of the battery at low temperatures and minimizing damage to the battery’s lifespan without the need for an additional power source.

Why is the internal heat generation rate higher in a battery pack?

The internal heat generation rate is relatively larger in the preheating due to the larger DCR caused by low temperatures, which helps to efficiently preheat battery pack by using the limited battery power. Table 5. Statistic results of co-estimation for battery pack in Test Ⅰ. 4.3.2 Results of Test Ⅴ in Test group 2.