What is lithium battery pack, lithium battery pack structure design
The lithium battery pack usually refers to the process of packaging, encapsulation, and assembly with a combination of batteries, as lithium batteries are assembled according to the series-parallel circuit of a single lithium battery to form a certain voltage and capacity, with the addition of a lithium battery protection plate, which can be charged and discharged. For example two batteries in series, according to customer requirements to form a specific shape, we call it PACK.
PACK battery assembly process is a crucial step in the production of lithium battery packs, and its importance also looks to become more and more significant along with the continuous development of the electric vehicle industry market. At this stage, power batteries for automobiles basically consist of the following systems: battery modules, battery management systems, thermal management systems, electrical and mechanical systems.
6 factors to be fully considered in the design of lithium battery pack PACK product structure.
1, lithium battery pack structure PACK design involves many levels
Such as mechanical structure design, to fully consider the strength, seismic level, heat/heat, moisture, dust, etc.; to fully consider the electrical design, to fully consider the safety regulations, EMC safety regulations, etc.; also fully consider the lithium battery management system design, to fully consider the overshoot, power loss, over-temperature, detection accuracy, battery balance, etc., to ensure that the battery is safe and reliable are to go through reasonable design and industry market confirmation.
2, power lithium battery pack PACK product structure design to fully consider the following factors.
a. Maintain the balance of air pressure inside and outside the lithium battery pack, as the lithium battery pack in the process of charging and discharging operation temperature, will change, thus causing changes in air pressure inside the pack, and PUW explosion-proof valve can breathe while not easy to seep, so it can keep the pack air pressure has been the same as the outside world;
b. Explosion-proof, once the thermal runaway of the lithium battery pack, the air pressure inside the pack rises significantly, at this time the battery pack is in danger of explosion, so the PUW explosion-proof valve becomes a breakthrough, and can quickly release pressure in a timely manner.
c. Moisture-proof, waterproof grade to IP68;
3, in the PACK lithium battery pack with the combination, in addition to the safety and reliability of the battery pack protection level of control, cooling, and heating, in particular, to pay attention to the method of battery connection, to give full consideration to the accuracy of the BMS measurement problem, this problem is widespread, ignoring the impact of the pressure drop on the test, which in turn causes the ability to balance the battery pack.
4, lithium battery pack PACK structure in the moisture-proof, shock-resistant level is important. That said, battery PACK is a business complex, involving many aspects, but if the details can be done well has long been very good.
5, lithium battery pack PACK product structure design integration: after the end of the individual module PACK, to be connected in series with each other to combine into a battery pack, which should be fully considered between each other can be connected in series to meet the need for a fast and safe form of series interface.
6, the battery PACK product structure design internal insulation design issues: battery in the design of a long time to fully consider the positive and negative insulation issues, but the uncertainties of the vehicle battery are too intricate, so in the PACK battery design operation process must be set separately insulation conditions to meet the need for impact, vibration, moisture, and other intricate environment battery is still safe and effective.