A formation apparatus for performing a charging and discharging test of a cylindrical secondary battery is disclosed. The cylindrical secondary battery includes a cylindrical body, and a positive electrode plate disposed on a top face of the body and a negative electrode plate disposed on the top face of the body. The formation apparatus includes a battery array tray on which a plurality of cylindrical secondary batteries are seated on and are arranged in a matrix form, a secondary battery contact device disposed above the battery array tray, wherein the secondary battery contact device includes a plurality of charging and discharging channels, a power supply disposed above the secondary battery contact device to supply power for the charging and discharging test to each of the plurality of charging and discharging channels, and a heat-dissipating fan facing toward the power supply to prevent overheating of the power supply.

A process and system for measuring internal faults in an electrochemical cell. The process for detecting an internal fault in an electrochemical cell includes measuring a voltage difference or a rate of change in voltage difference between a common terminal of a first electrochemical cell and a second electrochemical cell. The measuring is a time measurement. The first electrochemical cell or second electrochemical cell is accepted based on the measuring, or first electrochemical cell or second electrochemical cell is rejected based on the measure of the internal fault of the electrochemical cell.

An inspection method of a present electrical storage device includes: constituting a circuit with the electrical storage device being charged and a power supply, and passing a current by the power supply to the circuit in a direction of charging or discharging the electrical storage device; and in passing the current, determining the quality of the electrical storage device based on a converging state of the passing current. In passing the current, an output voltage of the power supply is changed from an initial value with the passage of time.

The invention relates to a device for testing, in particular high-frequency testing, a test item, for example an electrical machine or a converter, comprising:

a simulation unit for simulating an electrical energy accumulator using a simulation model; and

an electrical connection line, via which the test item can be connected to the simulation unit; wherein the device comprises compensation impedance for compensating for an impedance in accordance with a line inductance of the connection line.

An analysis device determines, by the Maharanobis-Taguchi system using a plurality of explanatory variables, to which of a first group and a second group a module representing a nickel metal hydride battery will belong when the module is subjected to capacity restoration processing, the first group being defined as a group of modules of which battery capacity is lower than a reference capacity, the second group being defined as a group of modules of which battery capacity is higher than a reference capacity. The plurality of explanatory variables include a plurality of feature values extracted from a Nyquist plot of the module. The plurality of feature values include at least two AC impedance real number components plotted in a semicircular portion, at least two AC impedance imaginary number components plotted in the semicircular portion, and at least one AC impedance imaginary number component plotted in a linear portion.

A method of manufacturing a lithium-ion secondary battery of the present invention includes at least four steps as follows: an initial charging step of charging the lithium-ion secondary battery, which has not been subjected to initial charging, under a temperature environment ranging of equal to or higher than −20° C. and equal to or lower than 15° C.; an aging step of leaving the lithium-ion secondary battery under a temperature environment ranging of equal to or higher than 30° C. and equal to or lower than 80° C. after the initial charging step; a short circuit detecting step of detecting the presence or absence of a short circuit of the lithium-ion secondary battery by measuring a voltage drop quantity of the lithium-ion secondary battery and comparing the voltage drop quantity with a reference value; and a sorting step of sorting out a lithium-ion secondary battery in which no short circuit is detected.

Disclosed are a system for and a method of determining the cause of a defect of a battery, which is specifically attributable to a human error, through electrochemical impedance spectroscopy (EIS). The system includes an impedance measurement unit for measuring an impedance value of a battery while sequentially applying AC current signals of respective frequencies to the battery, a controller for determining the cause of the defect of the battery on the basis of the measured impedance value, and a table in which each of impedance value ranges is associated with a cause of a defect. The controller determines a cause of a defect of the battery by comparing the measured impedance value and each of the impedance value ranges.

By a first energization process of applying a voltage with the power supply to cause a current for charging the electrical storage device to flow through the circuit and a second energization process of, when a transition condition is satisfied during the first energization process, decreasing the voltage of the power supply to cause the current to further flow, a condition of an electrical storage is determined. An effective resistance value of the circuit is set to 0.1Ω or below. A decrease in the voltage of the power supply in transition from the first energization process to the second energization process is set such that the effective resistance value in the second energization process is an intermediate value between a parasitic resistance value of the circuit and the effective resistance value in the first energization process.

The present invention relates to a device and method which can measure, in real time, the resistance, depending on pressure changes, of a separator that is immersed in an electrolyte, and enables analysis of the resistance properties of a separator reflecting the real operating state of a secondary battery.

Energy storage cell qualification and related systems, methods, and devices are disclosed. A method of qualifying rechargeable battery cells includes taking measurements on the rechargeable battery cells, determining specific capacity distributions of the rechargeable battery cells as a function of a number of discharge cycles based on the measurements, determining one or more specific capacity thresholds to separate the specific capacity distributions of the rechargeable battery cells into two or more classifications, and qualifying the rechargeable battery cells into the two or more classifications based, at least in part, on the specific capacity distributions and the one or more specific capacity thresholds. A method of implementing rechargeable battery cells into product manufacturing and qualifying the rechargeable battery cells, and deploying those of the rechargeable battery cells qualified into a first classification of the two or more classifications into the product.