A method for non-invasive characterisation of a cell for a battery is provided, the method comprising: measuring a magnetic field generated by the cell using a plurality of magnetic field sensors positioned adjacent to the cell, the measuring producing magnetic field sensor data, wherein the measuring is performed while the cell is in a passive state; determining current density profile data across the cell based on the magnetic field sensor data; and determining a condition of the cell using the current density profile data.

In an electric battery assembly plant, including a battery assembly line having a station that receives battery cells or modules to be assembled together, a measuring apparatus is configured for measuring the electrical resistance and the electrical voltage of a single battery cell or a battery module. The correct operation of the measuring apparatus is verified by arranging at least one dummy battery cell configured and sized to emulate a real battery cell, and having an electrical resistance of a predetermined value and/or including a voltage generator to generate a voltage of a strictly predetermined value at the terminals of the dummy battery cell. The dummy battery cell may then be used as a gauge to check in a simple and rapid way whether the measuring apparatus is operating correctly and reliably.

A method for calculating the process capacity at a specific temperature of a lithium secondary battery includes a correction to a process capacity (Q.sub.3) at a specific temperature (T.sub.2) is performed using a value (Q.sub.1−Q.sub.2) obtained by subtracting the charge capacity (Q.sub.2) at the time of the shipping charge from the discharge capacity (Q.sub.1) measured at a discharge temperature (T.sub.1). A system for calculating a process capacity of a lithium secondary battery is provided.

A system for testing a battery cell includes a test fixture configured to enclose the battery cell, a battery cycler configured to alternately charge and discharge the battery cell, an antenna mounted on a surface of the test fixture, the antenna configured to detect an electromagnetic signature of the battery cell and generate a signal indicative of the electromagnetic signature, and a detection module configured to receive the signal and detect characteristics of the battery cell based on the signal.

A force measurement module for determining of a force when installing a battery module into a battery housing includes a housing having a shape and external dimensions substantially of the battery module and at least one force sensor arranged in the housing. The at least one force sensor is configured to determine a force when installing the housing into the battery housing. Furthermore, a method for determining a force when installing a battery module into a battery housing is provided.

Provided is a secondary battery inspection device capable of improving inspection accuracy while simplifying the inspection of a secondary battery. Value of a model parameter of a secondary battery model is identitied based on a sampling period T. In the secondary battery model, impedance of internal resistance of a secondary battery 2(0) is expressed by an IIR transfer function and an FIR transfer function. When impulse current I(t) is input to a specified model as the secondary battery model the value of the model parameter of which is identified, a model output voltage as a voltage change form output from the specified model is estimated. The performance of the secondary battery 200 according to the sampling period T is evaluated based on the measurement result of the voltage of the secondary battery 200 when the impulse current I(t) flows into the secondary battery 200, and the specified model output voltage.

The present invention provides a processing system (10) including an acquisition unit (11) that acquires measurement data indicating a state of a power storage device, an item value calculation unit (12) that calculates an item value affecting safety of the power storage device based on the measurement data, a safety determination unit (13) that determines the safety of the power storage device based on the calculated item value, and a certification unit (14) that outputs certification information certifying that the power storage device is safe, in a case where the determined safety satisfies a predetermined condition.

Disclosed is a jig for a battery charging and discharging test, which includes a first frame and a second frame which are disposed in parallel to each other so as to be spaced apart from each other; two mounting rails installed to protrude forward, configured to connect the first and second frames, and having slit grooves which are open in directions facing each other and each have an open side, such that the battery pack is mounted on the mounting rails through a rail-type structure; and an anode unit and a cathode unit which are arranged on either side of the mounting rails, and brought into contact with a first terminal and a second terminal of the battery pack coupled to the mounting rails, respectively. The jig can fix a battery at various angles to flexibly cope with various test environments, in order to perform a battery charging and discharging test.

The testing method disclosed herein tests the thermal propagation occurred in the assembled battery. The testing method includes: calculating a reference voltage value V.sub.S based on the voltages of the single batteries; testing thermal propagation based on the reference voltage value V.sub.S and the voltages of the single batteries. In the testing, if a first voltage difference (V.sub.S−V.sub.1) between a voltage V.sub.1 of a predetermined first single battery and the reference voltage value V.sub.S is a first threshold value V.sub.T1 or more, and a second voltage difference (V.sub.S−V.sub.2) between a voltage V.sub.2 of a second single battery adjacent to the first single battery and the reference voltage value V.sub.S is a second threshold value V.sub.T2 or more, it is determined that the thermal propagation is occurring. According to such a testing method, the thermal propagation occurred can be detected accurately in an early stage.

The present technology provides a method of detecting a battery cell having a low voltage defect, including: setting a reference time point when a voltage of a battery is stabilized after a shipping charge, and measuring a first voltage of a battery cell at the reference time point; measuring a second voltage of the battery cell with a temporal interval longer than a period at which a self discharge of the battery cell is suppressed; and determining whether the battery cell has a low voltage defect by comparing a difference (ΔOCV) between the first voltage and the second voltage with a reference value, wherein the reference value is +3 sigma (σ) to +6 sigma (σ) in a normal distribution of a voltage drop amount obtained by the measuring of the first voltage and the measuring of the second voltage for a plurality of normal sample battery cell groups.