Battery internal short-circuit detecting device and method, battery pack, and electronic device system

Abstract

Provided is an internal short-circuit detecting device for detecting the internal short-circuit of a battery being charged with a constant current quantity (I). The internal short-circuit detecting device comprises a voltage detecting unit for detecting the terminal voltage of the battery, a terminal voltage acquiring unit for acquiring a terminal voltage (V1), as predetermined by the voltage detecting unit, at the starting point of a first period (DeltaW1) and a terminal voltage (V2) at the ending point, a voltage increase calculating unit for calculating the actual increase (DeltaV3) of the terminal voltage of the first period (DeltaW1) from the terminal voltages (V1 and V2), a voltage increase predicting unit for calculating a predicted increase (DeltaV4) of the terminal voltage for that period of the case, in which the charge is made in the current quantity (I) for the first period (DeltaW1), and an internal short-circuit deciding unit for deciding the internal short-circuit when the actual increase (DeltaV3) is at or lower than the sum of the predicted increase (DeltaV4) and 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-mentioned non-aqueous electrolyte olivine-type Iithium iron phosphate secondary battery and other non-aqueous electrolyte olivine-type lithium iron phosphate secondary batteries such as internal short-circuit devices, methods, battery components 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 electro...

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

Images