Denso Corporation

The Gakushuin School Corporation

Nobuo Yamamoto

Yoshinori Satou

Yuta Shimonishi

Hiroyasu Suzuki

Shigeki Komine

Shuhei Yoshida

Yuki Tachibana

Katsuki Hayashi

Yuya Minabe

Ichiro Yamada

Tomomi Asai

Takehiko Yamaki

Yoshinori Sato

Masaya Nakamura

Masaki Uchiyama

Keisuke Goto

Koji Ohira

Yoshikazu Kusano

Daisuke Mori

Yoshiyuki Inaguma

Haruki Tanaka

Mayu Iida

Shogo Suzuki

A deterioration degree determination device includes a charging and discharging control unit, a battery characteristic acquisition unit, and a determination unit. The charging and discharging control unit, in a state where multiple secondary batteries are connected to each other to form a battery pack, performs a charging and discharging operation of the battery pack while voltages of the secondary batteries are individually measured. The battery characteristic acquisition unit acquires a battery characteristic related to transition in a battery state over a predetermined voltage section for at least some of the multiple secondary batteries. The determination unit determines a deterioration degree of at least some of the multiple secondary batteries based on the battery characteristic or a battery characteristic relationship value calculated based on the battery characteristic.

Secondary battery deterioration degree determination device

A server for a deterioration degree determination system for a secondary battery includes an estimation formula memory unit and an update unit. The estimation formula memory unit stores an estimation formula for determining a deterioration degree based on a battery characteristic related to transition of a battery state over a predetermined voltage section in the secondary battery or a battery characteristic relationship value related to the battery characteristic. The update unit that updates the estimation formula stored in the estimation formula memory unit based on the battery characteristic related to the transition of the battery state of the secondary battery acquired by charging and discharging the secondary battery in an external terminal.

Server and external terminal for deterioration degree determination system for secondary battery, and deterioration degree determination system

A battery monitoring system monitors states of at least two secondary batteries. In the system, a data acquiring unit acquires a plurality of types of monitoring data to monitor the state of each of the secondary batteries. A failure determining unit determines whether the secondary battery has failed. The failure determining unit performs sparsity regularization using the acquired monitoring data of each of the secondary batteries as variables and calculates a partial correlation coefficient matrix of the monitoring data. The failure determining unit calculates, as an abnormality level, a difference in a partial correlation coefficient, which is a component of the partial correlation coefficient matrix, between two partial correlation coefficient matrices respectively calculated using the monitoring data of the two secondary batteries. The failure determining unit determines that either of the two secondary batteries has failed when the calculated abnormality level exceeds a predetermined threshold.

Battery monitoring system

In a system for setting power supply of reusable secondary cell modules, a degradation level estimation unit estimates a degradation level of a cell-module performance of each of a plurality of secondary cell modules, based on: the history information items about the respective the secondary cell modules acquired by a history information collection unit; and the cell-module performances of the respective secondary cell modules collected by a cell performance collection unit. A suppliable quantity prediction unit predicts a suppliable quantity of power of each of the plurality of secondary cell modules in accordance with the degradation level of the cell-module performance of a corresponding one of the plurality of secondary cell modules. A supply balance setting unit sets a power supply balance among the plurality of secondary cell modules based on the suppliable quantity of power of each of the plurality of secondary cell modules predicted by the prediction unit.

System for setting power supply of reusable secondary cell module

A degradation degree assessment device for a secondary battery is to assess a degree of degradation of a secondary battery and includes a battery characteristic acquisition unit, a capacity estimation unit, and an assessment unit. The battery characteristic acquisition unit acquires a battery characteristic relating to a voltage transition of the secondary battery in a predetermined voltage section. The assessment unit assesses the degree of degradation of the secondary battery based on the battery characteristic acquired by the battery characteristic acquisition unit or based on a battery characteristic-related value computed on the basis of the battery characteristic.

Device for assessing degree of degradation of secondary battery and assembled battery

A battery monitoring system includes a data acquiring unit and a failure determining unit. The data acquiring unit acquires a plurality of types of monitoring data to monitor a state of a secondary battery. The failure determining unit determines whether the secondary battery has failed. The failure determining unit performs sparsity regularization using the monitoring data as variables and calculates a partial correlation coefficient matrix of the monitoring data. The failure determining unit calculates, as an abnormality level, an amount of change in a partial correlation coefficient, which is a component of the partial correlation coefficient matrix, between two partial correlation coefficient matrices calculated at different periods. The failure determining unit determines that the secondary battery has failed when the calculated abnormality level exceeds a predetermined threshold.

A used secondary battery module management system server manages a manufacture of a battery assembly. The server stores, in a memory, a correspondence relationship of each of secondary battery modules among identification information, ranks, and status information. The server extracts an available rank from the ranks in response to a rebuilding request for the battery assembly. The available rank is a rank in which the number of the secondary battery modules having the status information indicating that the secondary battery modules are available is equal to or larger than the number of the secondary battery modules required to constitute the battery assembly. The server receives, from an external terminal, the identification information on each of selection secondary battery modules having an identical rank.

Used secondary battery module management system server, used secondary battery module management system external terminal, and used secondary battery module management system

An abnormality determination device for a secondary battery includes an internal-resistance calculation unit, a threshold memory unit, a capacity balance comparison unit, and an abnormality determination unit. The internal-resistance calculation unit detects an internal resistance in a negative-electrode reaction resistance dominant region in which a reaction resistance of a negative electrode is dominant in a charge and discharge reaction of the secondary battery. The threshold memory unit stores a capacity balance threshold used as a reference for determining abnormality in a balance between a capacity of a positive electrode and a capacity of the negative electrode in the secondary battery. The capacity balance comparison unit compares the internal resistance calculated by the internal-resistance calculation unit with the capacity balance threshold stored in the threshold memory unit. The abnormality determination unit determines abnormality in capacity balance in the secondary battery based on a comparison result from the capacity balance comparison unit.

Abnormality determination device for secondary battery

An apparatus for estimating a degradation degree of a secondary battery includes a pulse current applying unit that applies a pulse current; a voltage acquiring unit that acquires a charge voltage and a discharge voltage which are produced at the secondary battery by applying the pulse current; a relative value calculation unit that calculates a relative value between the charge voltage and the discharge voltage; a correlation storage unit that stores a correlation between a relative value between the charge voltage and the discharge voltage, and a degradation degree of the secondary battery; and a degradation degree estimation unit that obtains a degradation degree of the secondary battery from the correlation storage unit, based on the relative value calculated by the relative value calculation unit.

Degradation degree estimation apparatus and power source including the same

A positive electrode material includes: LiNiMMMnO. &#x3b1; satisfies a relational expression of 0.50&#x3c;&#x3b1;&#x2264;1.33. &#x3b3; satisfies a relational expression of 0.33&#x2264;&#x3b3;&#x2264;1.1. &#x3b7; satisfies a relational expression of 0&#x2264;&#x3b7;&#x2264;1.00. &#x3b2; satisfies a relational expression of 0&#x2264;&#x3b2;&#x3c;0.67. &#x3b5; satisfies a relational expression of 0&#x2264;&#x3b5;&#x2264;1.00. Mis at least one type selected from Co and Ga. Mis at least one type selected from Ge, Sn, and Sb. LiNiMMMnOhas a layered structure which includes a Li layer and a Ni layer. A crystal structure of LiNiMMMnOis a superlattice structure.

Cathode material, non-aqueous electrolyte secondary battery cathode, and non-aqueous electrolyte secondary battery

A non-aqueous rechargeable battery has a non-aqueous electrolyte and positive and negative electrodes capable of intercalating and deintercalating lithium ions. The positive electrode contains a lithium transition metal oxide expressed by LiNiMMOwhere 0.50&#x3c;&#x3b1;&#x3c;=1.33, 0&#x3c;=&#x3b2;&#x3c;0.67, 0&#x3c;=&#x3b3;&#x3c;=1.33, 0&#x3c;=&#x3b5;&#x3c;=1.00, Mis at least one of Co, Al and Ga, and Mis at least one of Mn, Ge, Sn and Sb, and x reversibly varies within a range of 0&#x3c;=x&#x3c;=2 by intercalating and deintercalating lithium ions. A resistance of the positive electrode when SOC is 0% is not less than twice of that when SOC is not less than a predetermined SOC. A capacity of the negative electrode is not less than 1.1 times of that of the positive electrode.

Non-aqueous electrolyte rechargeable battery

A positive electrode material includes: LiNiMMMnO; a layered structure including a Li layer and a Ni layer; and a chemical bond of M-O. &#x3b1; satisfies an equation of 0.50&#x3c;&#x3b1;&#x2264;1.33. &#x3b2; satisfies an equation of 0&#x2264;&#x3b2;&#x3c;0.67. &#x3b3; satisfies an equation of 0.33&#x2264;&#x3b3;&#x2264;1.1. &#x3b7; satisfies an equation of 0&#x2264;&#x3b7;&#x2264;1.00. &#x3b5; satisfies an equation of 0&#x2264;&#x3b5;&#x2264;1.00. Mrepresents at least one selected from Co and Ga. Mrepresents at least one selected from Ge, Sn and Sb.

Positive electrode material, positive electrode for non-aqueous electrolyte secondary battery, and non-aqueous electrolyte secondary battery

A solid electrolyte material includes: LiGeMO. x satisfies an equation of 0&#x2264;x&#x3c;0.5. y satisfies an equation of &#x2212;0.5&#x3c;y&#x3c;0.5. M represents at least one element selected from Mg, Al, Ti, V, Cr, Mn, Fe, Co, Ni, Zn, Ga, Zr, Sn, Nb, Sb, Cu, Sc, Ta, and Hf. Ge has a six-coordinate structure, or the solid electrolyte material has a crystal structure attributed to monoclinic, C12/c1.

Solid electrolyte material and lithium battery

A positive electrode material includes LiNiMMO, where 0&#x3c;(&#x3b1;+&#x3b7;)&#x2264;2; 0&#x2264;&#x3b7;&#x3c;0.5; 0&#x3c;&#x3b2;&#x2264;2; 0&#x2264;&#x3b3;&#x2264;1; 1&#x2264;(&#x3b1;+&#x3b7;+&#x3b2;)&#x2264;2.1; 0.8&#x3c;&#x3b2;/(&#x3b1;+&#x3b7;); Mis Mn; Mis at least one selected from Ge and Sn; and Ni and Mhas a local structure of six-coordination. The positive electrode material is used for a positive electrode for nonaqueous-electrolyte secondary battery and a nonaqueous-electrolyte secondary battery.

Positive electrode material, positive electrode for nonaqueous-electrolyte secondary battery, and nonaqueous-electrolyte secondary battery

A positive electrode material includes: LiNiMMMnOthat has a layered structure including a Li layer and a Ni layer, and in which a Ni&#x2014;O bond length is shorter than that calculated from the Shannon's ionic radii. &#x3b1; satisfies a relation of 0.50&#x3c;&#x3b1;&#x2264;1.33, &#x3b2; satisfies a relation of 0&#x2264;&#x3b2;&#x3c;0.67, &#x3b3; satisfies a relation of 0.33&#x2264;&#x3b3;&#x2264;1.1, &#x3b7; satisfies a relation of 0&#x2264;&#x3b7;&#x2264;1.00, &#x2208; satisfies a relation of 0&#x2264;&#x2208;&#x2264;1.00, Mrepresents at least one selected from Co and Ga, Mrepresents at least one selected from Ge, Sn and Sb. A positive electrode material may indicate a peak intensity ratio (I/I) of 0.9 or more in a measurement of a powder X-ray diffraction indexed with a space group of R3m.

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Kariya, Japan

Nobuo Yamamoto