A battery diagnosing technology capable of effectively diagnosing a defective battery cell among a plurality of battery cells included in a battery system at an early stage. The battery system diagnosing apparatus diagnoses a battery system including a plurality of battery cells having electrode tabs therein, and includes a cell measuring unit for measuring a voltage or current for each of the plurality of battery cells; and a processor for calculating a state of health (SOH) for each battery cell multiple times over time by using the voltage or current measured by the cell measuring unit and detecting a battery cell having a defect in the electrode tab among the plurality of battery cells based on the SOH of each battery cell calculated multiple times.

A secondary battery includes a jelly roll-type electrode assembly impregnated with an electrolyte solution; a battery case for housing the electrode assembly and the electrolyte solution; a cap assembly coupled with an upper portion of the battery case; and a reference electrode in which one end is immersed with the electrolyte solution and the other end is exposed to the outside through the battery case and the cap assembly.

A battery bending test system includes a fastening device having an inclined surface configured to hold a battery; a pressing device configured to press the battery to bend; and a load-bearing device configured to bear the fastening device, the load-bearing device having a reference surface for bearing the fastening device. A first angle Ø is formed between the inclined surface and the reference surface. The range of the first angle Ø is 0°<Ø<90°. The battery bending test system and method can precisely control the bending angle and bending morphology of the battery, and reasonably evaluate the safety performance of the battery when subjected to the bending force, thus meeting expectations of the safety test.

A battery pack leakage detection system and detection method are provided. The system includes a test container, a gas filling subsystem, a gas stirring subsystem and a test analysis subsystem. The method can test the sealing performance of the battery pack under the atmospheric pressure, so that the battery pack can meet the corresponding sealing grade requirements of IP67 and IP68. The method not only solves the problem that the traditional gas detection method cannot meet the test requirements of IP67 and IP68 due to insufficient measurement precision, but also solves the problem that the traditional vacuum helium detection method will damage the battery cells in the battery pack.

A jig for pressing a gas analysis monocell according to the present invention comprises: a first plate and a second plate which face each other with a monocell therebetween; a first auxiliary pad positioned between the first plate and the monocell; and a second auxiliary pad positioned between the second plate and the monocell, wherein the first plate and the second plate are formed of a thermosetting resin. When analyzing a gas generated from the monocell during a primary charge, the jig for pressing the monocell according to the present invention presses the thin monocell to prevent a gap from forming between electrodes due to the primary charge, and thus has an effect of deriving more reliable analysis results.

A battery cell monitoring circuit comprises an input pin; a reset command detection circuit comprising an integrator circuit coupled to the input pin; a counter circuit coupled to an output terminal of the integrator circuit; and a one-shot circuit coupled to an output terminal of the counter circuit; a logic gate coupled to an output terminal of the one-shot circuit; and a reset circuit coupled to the logic gate.

A diagnostic device for a secondary battery which is an all-solid-state battery containing a solid electrolyte transporting lithium ions, in which the diagnostic device includes: an interruption means configured to interrupt a charging current or a discharging current of the secondary battery connected to a circuit; a measuring means configured to measure over time a variation characteristic of a terminal voltage of the secondary battery after the current is interrupted by the interruption means; and a diagnostic means configured to diagnose the cause of the degradation of the secondary battery by comparing a change rate or a change amount in voltage between a charging characteristic specified from measured values of a terminal voltage of the secondary battery measured by the measuring means, a charging/discharging characteristic specified from the measured values of the terminal voltage measured by the measuring means, and a reference characteristic of the secondary battery.

Disclosed herein are improved methods and devices for recycling lithium cathodes from batteries using a Soxhlet extractor.

An electrical device including a surface which may be exposed to heat derived from operation of the electrical device such that the temperature of the surface increases during operation. The surface includes a temperature sensor including first and second electrodes separated by a layer of control material. The material properties and/or configuration of the control material are selected such that the electrical conductivity of the control material increases with increasing temperature so that electrical current is able to pass between the first and second electrodes once the temperature of any part of the control material has reached or exceeded a predetermined temperature. The temperature sensor extends over substantially the whole of the surface. A system including the electrical device and a method of controlling the electrical device is also disclosed.

Provided is a storage for used battery units capable of economically storing a plurality of used battery units of various manufacturers while suppressing the deterioration of the used battery units during storage. The storage for used battery units includes: a selection unit that selects a discharge target battery unit and a charge target battery unit from among the plurality of used battery units on the basis of the current values and the voltage values of the plurality of used battery units in storage and the predetermined SOC range of each of the plurality of used battery units; and a charge/discharge control unit which causes a discharge target battery unit to be discharged and charges the discharged power into a charge target battery unit such that the SOCs of the discharge target battery unit and the charge target battery unit reach a predetermined SOC range.