Can soft internal short-circuit faults be detected in lithium-ion battery packs?

Abstract: The early detection of soft internal short-circuit faults in lithium-ion battery packs is critical to ensuring the safe and reliable operation of electric vehicles. This article proposes a fault diagnosis method that can achieve the detection and assessment of soft internal short-circuit faults for lithium-ion battery packs.

Can a polymer protect a lithium-ion phosphate battery from a short-circuit?

In the case of a battery short-circuit, there may be such a drop of potential in the polymer that it will limit the short-circuit current. Thus, the polymer can be used as a promising short-circuit protection layer material for lithium-ion phosphate batteries, as it satisfies the theoretical requirements.

Are micro-short circuits a safety issue in lithium-ion battery packs?

Abusive lithium-ion battery operations can induce micro-short circuits, which can develop into severe short circuits and eventually thermal runaway events, a significant safety concern in lithium-ion battery packs. This paper aims to detect and quantify micro-short circuits before they become a safety issue.

Can polymer protection protect lithium ion batteries?

The practical realization of this protection concept was proved on the example of a polymer layer of poly [Ni (CH 3 OSalen)] placed in the battery cathode between the active mass and the Al current collector. Charge–discharge tests under normal operating conditions showed only a minor effect of polymer on lithium-ion battery performance.

What is micro short detection framework in lithium-ion battery pack?

Micro short detection framework in lithium-ion battery pack is presented. Offline least square-based and real-time gradient-based SoH estimators are proposed. SoH estimators accurately estimate cell capacity, resistances, and current mismatch. Micro short circuits are identified by cell-to-cell comparison of current mismatch.

What are the risks of external short-circuit of battery modules?

The risks of external short-circuit of battery modules with different voltage levels are tested for the first time. Two types of typical risk modes and influencing factors of ESC of battery modules are analyzed and proposed. The effectiveness and limitations of weak links for protection in external short circuits of battery modules are verified.