Internal short circuit (ISC) of lithium-ion batteries (LIBs) would be triggered due. to inevitable electric vehicle collision, which pose serious threats to the safety and stability of the battery system. However, there is a lack of research on the ISC mechanism of LIBs under dynamic impact loadings.
Fig. 1 is a block diagram of circuitry in a typical Li-ion battery pack. It shows an example of a safety protection circuit for the Li-ion cells and a gas gauge (capacity measuring device). The safety circuitry includes a Li-ion protector that controls back-to-back FET switches. These switches can be
Internal short circuit is one of the unsolved safety problems that may trigger the thermal runaway of lithium-ion batteries. This paper aims to detect the internal short circuit that occurs in battery pack with parallel-series hybrid connections based on the symmetrical loop circuit topology.
For Li-ion battery packs, battery management is the most essential as cells are needed to be controlled individually. When all cells are in parallel, the voltages are forced to be equal according to Kirchhoff’s circuit laws , and hence, no balancing is needed.
An internal short circuit (ISC) detection method for lithium-ion battery is proposed. The ISC detection algorithm is addressed from number theory and circuit topology. The algorithm can detect ISC based on signals extracted from Ampere Meters. The algorithm can detect ISC with a resistance of smaller than 10Ω within 15 s.
A triggering impact energy map of each ISC mode for LIBs with various SOCs is established. Internal short circuit (ISC) of lithium-ion batteries (LIBs) would be triggered due. to inevitable electric vehicle collision, which pose serious threats to the safety and stability of the battery system.