Abstract: A voltage applying unit of a water detecting device applies, to a pair of electrodes, a voltage changing within an application range that includes a first voltage which is smaller than an electrolysis voltage of water and a second voltage which is larger than the electrolysis voltage of the water. A judging unit judges presence or absence of the water based on change in electric current measured by a current measuring unit when the voltage changing within the application range is applied to the pair of electrodes.

Abstract: An aspect of the present invention is a model evaluation device including an acquisition part configured to acquire updated second auxiliary filter information in which first auxiliary filter information and second auxiliary filter information are updated through learning, the first auxiliary filter information being generated by a first processing based on data for generation which was used in generation of a mathematical model which predicts degradation of an analysis target, the second auxiliary filter information indicating a regulation of estimating a reliability of a prediction result by the mathematical model while using the first auxiliary filter information, and an evaluation part configured to evaluate an accuracy of prediction by the mathematical model while using the second auxiliary filter information in a case input-scheduled data which is scheduled to be input to the mathematical model is actually input to the mathematical model.

Abstract: What are provided are a positive electrode for a lithium-ion battery capable of suppressing the generation of carbon dioxide while increasing the battery capacity of the lithium-ion battery, a lithium-ion battery and a method for producing a positive electrode for a lithium-ion battery. A positive electrode for a lithium-ion battery having a positive electrode current collector and a positive electrode active material layer, in which the positive electrode active material layer has a positive electrode mixture containing the positive electrode active material, and the positive electrode mixture contains lithium carbonate in a range of 9% by mass or more and 20% by mass or less with respect of the total weight thereof.

Abstract: A recovery processing method of a lithium ion battery of an embodiment is a processing method of recovering performance of the lithium ion battery. The recovery processing method of the lithium ion battery includes a process of holding an SOC of the lithium ion battery at a fixed value that is within a range of 10% to 70%. The SOC in the process is preferably set to equal to or smaller than a value in which a gradient of an SOC-voltage curve has a minimum value.

Abstract: A recovery processing method of a lithium ion battery having a positive electrode and a negative electrode and in which performance has decreased due to a residue of lithium ions in the negative electrode, the method comprises: repeating a cycle a plurality of times, the cycle including: a first process of setting an SOC of the lithium ion battery to a first value, that is equal to or smaller than a value of the SOC in which a gradient of an SOC-voltage curve is a minimum value and that is equal to or greater than the value of the SOC in which the gradient of the SOC-voltage curve is two times the minimum value, by charging; and a second process of setting the SOC of the lithium ion battery to a second value, that is smaller than the first value, by discharging.

Abstract: A recovery processing method of a lithium ion battery includes repeating a cycle a plurality of times, and the cycle includes a first process of setting an SOC of the lithium ion battery to a first value that is equal to or less than a value of the SOC where a gradient of an SOC-voltage curve is a minimum value through charging, and a second process of setting the SOC of the lithium ion battery to a second value smaller than the first value through discharging.

Abstract: Provided is a battery degradation estimation device including a storage medium that stores computer-readable instructions, and a processor coupled to the storage medium, the processor executing the computer-readable instructions to: acquire time-series data including at least a voltage, SOC (State Of Charge), temperature, and current of a battery; convert the time-series data into intermediate data to be used for training; predict a future value of the intermediate data and a future value of an indicator relating to a degradation state of the battery by using a prediction function to generate training data; train a prediction model for estimating the indicator relating to the degradation state of the battery on the basis of the training data; and estimate the indicator relating to the degradation state of the battery on the basis of the prediction model.

Abstract: A battery model construction method is a method for constructing a battery model that treats powers of a plurality of usage history parameters defined on a basis of time series data about a current, a voltage, and a temperature of a battery as explanatory variables and treats a predicted SOH value as an objective variable, the method including: an acquiring step ST1 for acquiring time series data of usage history parameters and measured SOH values; an exponentiating step ST2 for raising the usage history parameters by a prescribed exponent to thereby generate time series data of input parameters; a training step ST4 for training the battery model by using the time series data of the input parameters and the measured SOH values as training data; and a searching step ST8 for searching for an optimal exponent by repeatedly performing the steps ST2 and ST4 while varying the exponent.

Abstract: A battery model construction method includes: a step ST2 for constructing a battery model; steps ST3 and ST4 for evaluating, for each sample battery, the prediction error between a measured value of the SOH and a predicted value according to the battery model, and determining whether there is inherent bias in the prediction error for each sample battery; steps ST5 and ST6 for constructing a first error prediction model associating explanatory variables defined on the basis of usage history parameters with an objective variable, and determining whether a first correlation exists between the measured value of the average prediction error acquired in steps ST3 and ST4 and the predicted value according to the first error prediction model; and a step ST7 for reconstructing the battery model in the case where it is determined that there is bias and that the first correlation exists in steps ST5 and ST6.

Abstract: A data abnormality determination apparatus 1 determines that there is an abnormality in input data and is provided with: a probability density calculator 11 that calculates, as an input density value, a probability density value for the input data in a probability density function constructed based on a data set; an occurrence probability calculator 12 that calculates, as an occurrence probability with respect to the input data, a value corresponding to an integral of the probability density function across a tail region in which the probability density value in the probability density function is equal to or less than the input density value; and an abnormality determiner 13 determines that there is an abnormality in the input data based on the occurrence probability.

Abstract: A prediction system includes a charger and an estimation apparatus, and performs a method of predicting capacity degradation of a secondary battery. The estimation apparatus obtains changes of a plurality of parameters of capacity degradation, based on a fitting operation of fitting, to a target-battery charge curve of a target battery, reference data of the target battery or a battery of the same type as the target battery. Further, the estimation apparatus identifies a degradation change point where the degradation speed of the maximum battery capacity becomes high as a result of increase of the usage degree of the target battery, based on the plurality of obtained parameters.

Abstract: A measurement system has a charger and an estimation apparatus and performs a method of estimating the internal degradation state of a degraded cell. The estimation apparatus calculates a reference capacity characteristic curve by differentiating a reference charge curve, sets a reference capacity characteristic curve, which is less than a division point, to a negative electrode characteristic curve, and sets a reference capacity characteristic curve, which is not less than the divisional point, to a positive electrode characteristic curve. Further, the estimation apparatus calculates a target capacity characteristic curve by differentiating the target charge curve and fits the target capacity characteristic curve and each of the negative electrode characteristic curve and the positive electrode characteristic curve, thereby obtaining changes of a plurality of types of parameters.

Abstract: A method for manufacturing a carbon fiber sheet, the method including a carbon fiber forming step of heating a resin sheet to a carbonization temperature at a heating rate of 15,000° C./sec or higher, thereby forming a carbon fiber from the resin sheet. In the carbon fiber forming step, the resin sheet is preferably irradiated with an energy ray having an output density of 130 W/mm2 or higher and an amount of irradiation energy of 0.05 J/mm2 or more.

Abstract: A voltage applying unit of a water detecting device applies, to a pair of electrodes, a voltage changing within an application range that includes a first voltage which is smaller than an electrolysis voltage of water and a second voltage which is larger than the electrolysis voltage of the water. A judging unit judges presence or absence of the water based on change in electric current measured by a current measuring unit when the voltage changing within the application range is applied to the pair of electrodes.

Abstract: A water detection device is provided for a power generation cell. The power generation cell has a reactant gas flow field (oxygen-containing gas flow field) configured to allow a reactant gas to flow along a membrane electrode assembly. The water detection device includes an electrically conductive member and a support member. The support member is an insulating member. The support member covers, and supports an electrically conductive member, and has an opening which exposes part of the electrically conductive member as an electrode. The opening is provided at a position facing a reactant gas flow field.

Abstract: A water detection device is provided for a power generation cell. The power generation cell has a reactant gas flow field (oxygen-containing gas flow field) configured to allow a reactant gas to flow along a membrane electrode assembly. The water detection device includes an electrically conductive member and a support member. The support member is an insulating member. The support member covers, and supports an electrically conductive member, and has an opening which exposes part of the electrically conductive member as an electrode. The opening is provided at a position facing a reactant gas flow field.

Abstract: A method for manufacturing a carbon fiber sheet, the method including a carbon fiber forming step of heating a resin sheet to a carbonization temperature at a heating rate of 15,000° C./sec or higher, thereby forming a carbon fiber from the resin sheet. In the carbon fiber forming step, the resin sheet is preferably irradiated with an energy ray having an output density of 130 W/mm2 or higher and an amount of irradiation energy of 0.05 J/mm2 or more.

Abstract: Curtain-shaped bag bodies 26, 27 are expanded and developed inside a vehicle room on windows of a vehicle. The bag bodies 26, 27 are expanded and developed by a plurality of inflaters 26, 27, and the plurality of inflaters 26, 27 are arranged in the same interior material being well organized.

Abstract: An occupant restraint system in which an air bag is inflated with a gas generated by an inflator so as to be deployed along an inner surface of a side portion of a passenger compartment in a curtain-like fashion when a vehicle is involved in a collision, wherein a portion of the air bag in a folded state which is located in the vicinity of an end portion thereof is disposed within a space between a pillar and a pillar garnish mounted on a side of the pillar which faces a passenger compartment. By accommodating the air bag within an air bag accommodation chamber formed by partitioning the space with a bulkhead formed integrally on the pillar garnish, the bulkhead is allowed to be interposed between other members residing within the pillar garnish such as clips and brackets and the air bag.

Abstract: In an occupant restraint system C, an airbag 21 is inflated by using gas, which is generated by an inflator 35 upon a vehicle collision, to be deployed into a shape of curtain along the inner surface of a side of a vehicle compartment. The occupant restraint system C includes pluralities of cells 21c and 21d, which are inflated along the inner surfaces of a B-pillar 15 and a C-pillar 16. By inclining axes S1 to S4 of the cells 21c and 21d with respect to an axis P1 of the B-pillar 15 or an axis P2 of the C-pillar 16, the lower ends of these cells 21c and 21d are hardly trapped by the B-pillar 15 or the C-pillar 16. Thus, the cells of the airbag are prevented from being trapped by the pillars to thereby enable the smooth deployment of the airbag.