BMS Thermal Management & Cooling Systems Flashcards
6 cards from real BMS practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 BMS Thermal Management & Cooling Systems flashcards as text
What is the optimal operating temperature range for most lithium-ion battery cells used in EV applications?
Answer: 15°C to 35°C
Lithium-ion cells perform best and have the longest cycle life when kept between 15°C and 35°C.
Which thermal runaway trigger is most commonly caused by an internal short circuit?
Answer: Dendrite formation
Dendrite formation occurs during repeated cycling and can pierce the separator, causing an internal short circuit that initiates thermal runaway.
What is the primary purpose of a Battery Thermal Management System (BTMS)?
Answer: Maintain cells within a safe temperature window
A BTMS keeps all cells within an acceptable temperature range to maximize safety, performance, and longevity.
In a liquid-cooled battery pack, coolant typically flows through which component in direct contact with the cells?
Answer: Cold plates
Cold plates are aluminum or copper structures with internal coolant channels placed against cell surfaces to extract heat.
Which metric best describes the uniformity of temperature distribution across a battery module?
Answer: Temperature delta (ΔT)
Temperature delta (ΔT) between the hottest and coolest cell in a module is the standard measure of thermal uniformity.
What happens to battery internal resistance as cell temperature decreases below 0°C?
Answer: It increases significantly
Below 0°C, electrolyte conductivity drops sharply, causing internal resistance to rise and available power/capacity to reduce.