Cell internal shortcircuit detection device, method, battery pack, and electronic device system

Abstract

A battery internal shortcircuit detection device includes: a battery temperature detection unit which detects a battery temperature Tr; an ambient temperature detection unit which detects an ambient temperature Te; an average heating value detection unit which detects an average value Pav of the battery heating value per a predetermined first period DeltaW1 accompanying a battery discharge or charge; a battery temperature estimation unit which obtains a battery temperature Tp estimated to be reached after a predetermined second period DeltaW2 has elapsed after detection of the average value Pav of the heating value, according to the average value Pav of the heating value and the ambient temperature Te; and an internal shortcircuit judging unit which decides that an internal shortcircuit has occurred when the actual battery temperature Tr after the elapse of the second period DeltaW2 is equal to or greater than the estimated battery temperature Tp processed by a predetermined coefficient alpha.

Description

Technical field [0001] The present invention relates to a non-aqueous electrolyte secondary battery for detecting a non-aqueous electrolyte secondary battery having a heat-resistant layer composed of a porous protective film containing a resin binder and an inorganic oxide filler between a negative electrode and a positive electrode. , The plate impedance is 4Ω·cm 2 The above non-aqueous electrolyte olivine-type lithium iron phosphate secondary battery and other non-aqueous electrolyte olivine-type lithium iron phosphate secondary batteries such as internal short-circuit devices, methods, battery modules and electronic equipment systems. Background technique [0002] For example, in Japanese Patent Publication No. 3371301 (hereinafter referred to as "Patent Document 1") and International Publication No. 05 / 098997 pamphlet (hereinafter referred to as "Patent Document 2"), it is described that there is an inclusion between the negative electrode and the positive electrode. Non-aque...

AI Technical Summary

Problems solved by technology

However, using olivine-type lithium iron phosphate (LiFePO 4 ) As the secondary battery of the positive electrode material, its conductivity is low, and the diffusion rate of lithium ions is also extremely slow, so there is a secondary battery having the structure of the porous protective film of the above-mentioned Patent Document 1 or Patent Document 2. The problem that it cannot be detected by the methods of the patent documents 3 to 5 when the internal short circuit

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