Denso Corporation

Yuta Shimonishi

Nobuo Yamamoto

Shuhei Yoshida

Yuki Tachibana

Yoshinori Satou

Shigeki Komine

Hiroyoshi Yamamoto

Daisuke Shibata

Yoshinori Sato

In the battery deterioration prediction system, a polarization calculation unit calculates negative and positive electrode polarizations from negative and positive electrode resistances, and an electrical current value flowing through the secondary battery. A CCP calculation unit calculates a negative electrode closed-circuit potential on the secondary battery negative electrode open circuit potential and the negative electrode polarization calculated by the polarization calculation unit, and calculates a positive electrode closed-circuit potential based on the secondary battery positive electrode open circuit potential and the positive electrode polarization calculated by the polarization calculation unit. A capacity prediction unit predicts the positive/negative electrode capacity, and positive/negative electrode SOC deviation capacity of a secondary battery based on at least one of the closed-circuit potential of the negative and positive electrodes calculated by the CCP calculation unit, and predicts the battery capacity based on the negative and positive electrode capacities, and the positive/negative electrode SOC capacity deviation.

Battery deterioration prediction system

An information calculation system acquires a battery load history of a secondary battery that has been used. The information calculation system calculates first degradation states of a plurality of battery constituent elements of the secondary battery, based on the battery load history acquired and a plurality of degradation factors related to each of the battery constituent elements. The information calculation system acquires estimated load information on a load that is estimated to act on the secondary battery when the secondary battery is used in a future application. The information calculation system calculates future second degradation states of the plurality of battery constituent elements of the secondary battery when the secondary battery is used in the future application, based on the first degradation states related to the battery constituent elements calculated, the estimated load information acquired, and the plurality of degradation factors related to the battery constituent elements.

Information calculation system for battery degradation

To provide a battery service life estimation system capable of improving estimation accuracy, a new battery service life estimation system includes an intersection time estimation unit and a service life estimation unit. In view of a relation between a cumulative usage period and a capacity retention0 rate of a secondary battery containing a non-aqueous electrolyte, the intersection time estimation unit estimates a prediction line intersection time tx when an anode service life prediction line intersects with a cathode service life prediction line on a plane coordinate system. The service life estimation unit estimates a battery service life by using the anode service life prediction formula before a point of the prediction line intersection time tx and the cathode service life prediction formula described the prediction line intersection time tx.

Battery life estimation system and method

A battery structure includes a plurality of batteries each made of lithium-ion secondary battery; and a plurality of arrangement portions in which the plurality of batteries are arranged. The plurality of arrangement portions are divided into two groups of: a upper heat transfer group having heat transfer orders higher than a center value of the heat transfer orders, where the heat transfer orders are respective amount of heat transfer from the batteries being ranked in descending order; and a lower heat transfer group having the heat transfer orders lower than the center value. A battery among the plurality of batteries showing the highest value of a lithium deposition tolerance which represents a degree of lithium being unlikely to deposit during charge/discharge operation, is disposed in a high tolerance arrangement portion in the plurality of arrangement portions, the high tolerance arrangement portion belonging to the upper heat transfer group.

Battery structure reducing lithium deposition

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 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 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.

A positive electrode material includes: a composite oxide of solid solution including LiSnOand LiNiMMMnO. &#x3b1; satisfies an equation of 0.50&#x2264;&#x3b1;&#x2264;1.35. &#x3b2; satisfies an equation of 0&#x2264;&#x3b2;&#x3c;1.0. &#x3b3; satisfies an equation of 0&#x2264;&#x3b3;&#x2264;0.66. &#x3b2; and &#x3b3; satisfies an equation of 0.33&#x2264;&#x3b2;+&#x3b3;&#x2264;1.1. &#x3bd; satisfies an equation of 0&#x2264;&#x3bd;&#x2264;0.66. &#x2208; satisfies an equation of 0&#x2264;&#x2208;&#x2264;1.00. Mrepresents at least one selected from Sn, SbAl. Mrepresents Sb.

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Kariya, Japan

Yuta Shimonishi