A method for measuring a complex impedance of a plurality of battery cells in a battery pack comprises controlling an excitation current through the plurality of battery cells in the battery pack; receiving, in a single common measurement circuit, a plurality of voltage signals corresponding to the plurality of battery cells; measuring the excitation current; and calculating a complex impedance of each of the battery cells in the plurality of battery cells based on the plurality of voltage signals and the measured excitation current in a single measurement cycle using either one analog-to-digital converter (ADC) per battery cell or two matched ADCs per battery cell.

An apparatus for determining a degradation state of a battery includes a sensing unit configured to output sensing information indicating a voltage and a current of the battery and a control unit. The control unit determines a degradation ratio of the battery and a measured Q-dV/dQ curve based on the sensing information. The measured Q-dV/dQ curve shows a relationship between a remaining capacity of the battery and a ratio of a change in voltage of the battery to a change in remaining capacity of the battery. The control unit detects a plurality of feature points from the measured Q-dV/dQ curve. The control unit determines a positive electrode degradation ratio, a negative electrode degradation ratio and a lithium ion loss ratio of the battery based on the degradation ratio, the plurality of feature points, a predetermined positive electrode Q-dV/dQ curve and a predetermined negative electrode Q-dV/dQ curve.

An apparatus for determining a degradation state of a battery includes a sensing unit configured to output sensing information indicating a voltage and a current of the battery and a control unit. The control unit determines a degradation ratio of the battery and a measured Q-dV/dQ curve based on the sensing information. The measured Q-dV/dQ curve shows a relationship between a remaining capacity of the battery and a ratio of a change in voltage of the battery to a change in remaining capacity of the battery. The control unit detects a plurality of feature points from the measured Q-dV/dQ curve. The control unit determines a positive electrode degradation ratio, a negative electrode degradation ratio and a lithium ion loss ratio of the battery based on the degradation ratio, the plurality of feature points, a predetermined positive electrode Q-dV/dQ curve and a predetermined negative electrode Q-dV/dQ curve.

A storage battery device includes a plurality of cell modules including a plurality of battery cells, a data acquirer configured to acquire voltage data of the battery cells, a calculator configured to calculate a rise rate of an internal resistance value with respect to a default value according to the voltage data of the battery cells, and a storage configured to store therein the rise rate of the internal resistance value with respect to the default value.

A storage battery device includes a plurality of cell modules including a plurality of battery cells, a data acquirer configured to acquire voltage data of the battery cells, a calculator configured to calculate a rise rate of an internal resistance value with respect to a default value according to the voltage data of the battery cells, and a storage configured to store therein the rise rate of the internal resistance value with respect to the default value.

A method determines at least one power contact resistance or at least one resistance value corresponding to the at least one power contact resistance between at least one pack power contact of a battery pack and at least one apparatus power contact of an electrically driven work apparatus or of a charging apparatus. The pack power contact and the apparatus power contact touch one another and are loaded with a power current. The battery pack and the work apparatus or the charging apparatus are electrically connected by a data communication line for transmitting a data communication signal. The method determines the power contact resistance or the resistance value by comparing a signal voltage variable of the data communication line and a power voltage variable of the at least one pack power contact or of the apparatus power contact with one another, wherein the signal voltage variable or the power voltage variable is dependent on a voltage drop caused by the power current and the at least one power contact resistance.

A method determines at least one power contact resistance or at least one resistance value corresponding to the at least one power contact resistance between at least one pack power contact of a battery pack and at least one apparatus power contact of an electrically driven work apparatus or of a charging apparatus. The pack power contact and the apparatus power contact touch one another and are loaded with a power current. The battery pack and the work apparatus or the charging apparatus are electrically connected by a data communication line for transmitting a data communication signal. The method determines the power contact resistance or the resistance value by comparing a signal voltage variable of the data communication line and a power voltage variable of the at least one pack power contact or of the apparatus power contact with one another, wherein the signal voltage variable or the power voltage variable is dependent on a voltage drop caused by the power current and the at least one power contact resistance.

An information providing system in which a plurality of information collection devices, a server, and a plurality of information reception devices are connected by a network, each of the plurality of information collection devices comprises: a rechargeable battery configured to supply power to drive the information collection device; a monitoring circuit configured to monitor a state of the battery; a sensor configured to detect a state of an environment where the plurality of information collection devices are installed; a memory configured to store first data indicating a history of the state of the battery monitored by the monitoring circuit and second data indicating a state of the environment detected by the sensor; and a transmission unit configured to transmit the first data and the second data stored in the memory via the network based on a request from the server.

A method for manufacturing a laminated battery in which a plurality of unit battery cells each having a negative-electrode layer, a positive-electrode layer, and a solid electrolyte layer located between the negative-electrode layer and the positive-electrode layer are laminated, the method including: measuring respective characteristics of the plurality of unit battery cells; laminating the plurality of unit battery cells, the characteristics of the plurality of unit battery cells being measured; and on the basis of the respective characteristics of the plurality of unit battery cells laminated in the laminating, adjusting areas of the plurality of unit battery cells which are laminated by collectively cutting the plurality of unit battery cells which are laminated and thereby so that a battery capacity of the laminated battery falls within a predetermined range of value.

A method for manufacturing a laminated battery in which a plurality of unit battery cells each having a negative-electrode layer, a positive-electrode layer, and a solid electrolyte layer located between the negative-electrode layer and the positive-electrode layer are laminated, the method including: measuring respective characteristics of the plurality of unit battery cells; laminating the plurality of unit battery cells, the characteristics of the plurality of unit battery cells being measured; and on the basis of the respective characteristics of the plurality of unit battery cells laminated in the laminating, adjusting areas of the plurality of unit battery cells which are laminated by collectively cutting the plurality of unit battery cells which are laminated and thereby so that a battery capacity of the laminated battery falls within a predetermined range of value.