Toyota Jidosha Kabushiki Kaisha

Toshihiko Mitsuhashi

Koji Takahata

Tatsuya Hashimoto

Yusuke Fukumoto

Hideki Sano

Yuji Yokoyama

Keisuke Ohara

Naoyuki Wada

Akihiro Ochiai

Masahiro Morita

Yoshiyuki Ozaki

Hajime Konishi

Hironobu Hashimoto

Makoto Nakashima

A secondary battery restoring method includes a first step of determining whether or not a value of an input-output characteristic of a secondary battery or a battery module is within a predetermined range of reference values, and a second step of adjusting the secondary battery or the battery module to a predetermined low SOC condition of from 0% to 20% SOC and thereafter leaving the secondary battery or the battery module to stand if, in the first step, the value of the input-output characteristic is determined to be outside the predetermined range of reference values.

Method of restoring secondary battery and method of reusing secondary battery

The non-aqueous electrolyte secondary batteryaccording to the present invention is provided with an electrode bodyincluding a positive electrodethat contains a positive electrode active material and a negative electrodethat contains a negative electrode active material, a non-aqueous electrolyte, and a battery casethat houses the electrode body and the non-aqueous electrolyte. The non-aqueous electrolyte contains a complex, which contains copper (I) chloride as a constituent component and which is capable of adsorbing at least carbon monoxide and carbon dioxide, and a coating film that contains at least one of phosphorus and boron is formed on the surface of the negative electrode active material.

Non-aqueous electrolyte secondary battery and method for producing same

Provided is a method by which the sorting as to whether a spent nonaqueous electrolyte secondary battery with the degraded input/output characteristics can be reused can be realized more accurately by taking into consideration the degradation of the input/output characteristics which is caused by the salt concentration unevenness and liquid shortage in the electrode body. The method for sorting a reusable nonaqueous electrolyte secondary battery, which is disclosed herein, includes: a preparation step of preparing a spent nonaqueous electrolyte secondary battery having a positive electrode and a negative electrode; a high-temperature storage step of storing the prepared nonaqueous electrolyte secondary battery for a predetermined time under a high-temperature condition; and a determination step of determining, on the basis of an internal resistance measured after the high-temperature storage step, whether or not the nonaqueous electrolyte secondary battery which has been stored at a high temperature can be reused.

Method for sorting reusable nonaqueous electrolyte secondary battery

Provided is a method that makes it possible to determine more accurately whether or not a spent nonaqueous electrolyte secondary battery is reusable. The method for sorting a reusable nonaqueous electrolyte secondary battery, which is disclosed herein, includes: a step of preparing a spent nonaqueous electrolyte secondary battery having an electrode body in which a positive electrode and a negative electrode are laminated; a step of vibrating the prepared nonaqueous electrolyte secondary battery in a direction perpendicular to the lamination direction of the positive electrode and the negative electrode; a step of acquiring a value of an internal resistance of the nonaqueous electrolyte secondary battery subjected to vibrations; and a step of determining whether or not the nonaqueous electrolyte secondary battery is reusable by comparing the acquired value of the internal resistance with a predetermined threshold of the internal resistance.

Method for sorting reuseable nonaqueous electrolyte secondary battery

An evaluation value is calculated based on a history of currents in order to quantitatively evaluate unevenness of an ion concentration in a non-aqueous electrolyte of a secondary battery. An integrated evaluation value for each of the discharging side and the charging side are calculated. When the integrated evaluation value exceeds a positive threshold value, discharging of the secondary battery is restricted, and when the integrated evaluation value exceeds a negative threshold value, charging of the secondary battery is restricted.

Battery system of electrically powered vehicle

A method of manufacturing a lithium-ion secondary battery proposed herein includes the following steps of: preparing a battery in which an electrode assembly is enclosed in a battery case; filling a first electrolyte solution containing a film forming agent into the battery case; charging and discharging the battery filled with the first electrolyte solution; discharging the first electrolyte solution from the battery that has been charged and discharged; and filling a second electrolyte solution containing a film forming agent at a concentration of less than 0.005 mol/L into the battery case from which the first electrolyte solution has been discharged.

Method of manufacturing lithium-ion secondary battery

The present invention provides a method for producing a nonaqueous electrolyte secondary battery in which the drop in capacity retention rate is controlled by forming a coating in a more favorable state on the surface of the negative electrode active material. This production method comprises a step Sof preparing a battery assembly in which an electrode assembly is housed within a battery case, the electrode assembly including a positive electrode produced by forming a positive electrode active material layer containing at least a positive electrode active material, and a negative electrode produced by forming a negative electrode active material layer containing at least a negative electrode active material; a first injection step Sof injecting a nonaqueous electrolyte containing a specified additive into the battery case; a precharging step Sof forming the additive-derived coating on the surface of the negative electrode active material; a second injection step Sof injecting a nonaqueous electrolyte not containing an additive into the battery case; and a charge and discharge step Sof charging and discharging the battery assembly to a predetermined charging and discharge voltage.

Method for producing nonaqueous electrolyte secondary battery

The present invention provides a sealed lithium secondary battery in which redox shuttle reactions of an aromatic compound that is an overcharge inhibitor are inhibited, and the aromatic compound decomposes appropriately, and a desired amount of gas can be generated more stably than in conventional instances, even in high-temperature environments. In the sealed lithium secondary battery (), an electrode assembly () and an electrolyte are accommodated in a battery case () that is provided with a current interrupt device (). The electrolyte comprises a compound that is capable of suppressing drops in viscosity of the electrolyte as a result of a rise in temperature in a temperature region up to 100&#xb0; C., and an aromatic compound capable of generating hydrogen gas when a predetermined battery voltage is exceeded.

Sealed lithium secondary battery

The present invention provides a method of manufacturing a nonaqueous electrolyte secondary battery in which graphite fissuring during rolling of the negative electrode mixture layer is prevented and a deterioration in the performance of the battery is thereby suppressed. The manufacturing method provided by the present invention is a method of manufacturing a nonaqueous electrolyte secondary battery that has a positive electrode and a negative electrode, and includes: a coating step of coating a current collectorwith a positive electrode mixturecontaining graphite; a magnetic field application step of applying, to the negative electrode mixturemade to coat the current collectorin the coating step, a magnetic field in which the magnetic lines of force are oriented in one direction parallel to the plane of the current collectorcoated with the negative electrode mixture; a drying step of drying the negative electrode mixtureto which the magnetic field has been applied in the magnetic field application step; and a rolling step of rolling a negative electrode mixture layer resulted from the drying step.

Nonaqueous electrolyte secondary battery and manufacturing method thereof

A main object of the present invention to provide a nonaqueous electrolyte secondary battery having high durability towards charge and discharge cycles, by preventing buckling of a wound electrode body. The secondary battery provided by the present invention comprises: a nonaqueous electrolyte; and a wound electrode bodyconfigured by superposing on each other, and winding a positive electrode sheethaving a positive electrode collector formed to a sheet shape and a positive electrode active material layer formed on that collector, a, negative electrode sheethaving a negative electrode collector formed to a sheet shape and a negative electrode active material layer formed on that collector, and a separatorformed to a sheet shape. The negative electrode active material contained in the negative electrode active material layer is oriented in a predetermined direction. The positive electrode sheet, negative electrode sheetand separator sheetall have a tensile elongation at break of 2% or higher.

Nonaqueous electrolyte secondary battery provided with a wound electrode body

An electrode plate includes a current collector plate and an active material layer formed thereon. The active material layer includes, as a binder, a plurality of binders having different glass transition points (Tg) from each other. A ratio (A/A) between the amount of a binder contained in a surface section and the amount of a binder contained in a current collector plate section is 1.0 to 1.2. Further, an average glass transition point (Tgu) of the binder in the surface section is lower than an average glass transition point (Tgd) of the binder in the current collector plate section (Tgu&#x3c;Tgd).

Electrode plate with a binder in a surface section with a lower glass transition point than a binder in a current collector plate section, secondary battery, and method for producing the electrode plate

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Toyota, Japan

Toshihiko Mitsuhashi