THE FURUKAWA BATTERY CO., Ltd.

A liquid-type lead storage battery includes a positive electrode collector formed of a lead alloy having a rolled structure. A grid substrate of the collector has an upper frame bone located on the upper side and a lower frame bone located on the lower side, each extending laterally, and a pair of vertical frame bones extending vertically. A lug projects upward from a position shifted to the side close to either one of the pair of vertical frame bones from the longitudinal center of the upper frame bone. The intermediate bones have vertical intermediate bones from the upper to lower frame bone and lateral intermediate bones connecting the pair of vertical frame bones. At least one of the lateral intermediate bones has a cross-sectional area B larger than an average value A of the cross-sectional areas of the plurality of lateral intermediate bones, such that B/A is 1.15 or more.

Provided is a positive electrode for a non-aqueous electrolyte secondary battery that includes a positive electrode current collector and a positive electrode mixture layer, and the positive electrode mixture layer contains a first positive electrode active material, a second positive electrode active material in which a coating film made of a carbon material is formed on a surface of a phosphate compound having an olivine structure, and an electrically conductive aid.

A magnesium secondary battery includes: a positive electrode; a negative electrode having a magnesium layer made of a magnesium metal material; a separator; and an electrolytic solution, in which in powder X-ray diffraction measurement of the negative electrode using a CuKα ray, a peak intensity ratio represented by (002)/(110) obtained from a diffraction peak representing a (002) plane within a range of 2θ=35°±5° and a diffraction peak representing a (110) plane within a range of 2θ=57°±5° is 7 or more and 12 or less, and the separator has a porosity W (%) of 40≤W≤50 and a film thickness X (μm) of 20≤X≤40.

A magnesium secondary battery includes: a positive electrode; a negative electrode having a magnesium layer made of a eutectic magnesium alloy; a separator; and an electrolytic solution, in which in powder X-ray diffraction measurement of the negative electrode using a CuKα ray, when an intensity ratio Y obtained from a diffraction peak representing a (100) plane within a range of 2θ=32°±5° and a diffraction peak representing a (002) plane within a range of 2θ=35°±5° is defined as a diffraction peak intensity ratio of (100)/(002), 15<Y is satisfied.

The occurrence of a short circuit inside a cell member is prevented by means of a through hole formed to prevent an influence on components, such as deformation of a separator, inside a space housing the cell member caused by an injected electrolyte solution, while also considering ease of the injection. A battery includes cell members stacked and arranged with spacing, each including a positive electrode, a negative electrode, and a separator. The battery includes a space forming member, and a through hole open inside a space housing the cell member. The through hole includes an outer opening connected to an inner opening by a through path, and a wall portion in at least part of the through path. The wall portion makes an electrolyte solution have a different flow direction when flowing in from the outer opening compared to flowing from the inner opening into the space.

The occurrence of a short circuit inside a cell member is prevented and the takt time is shortened by forming a through hole to prevent an influence on components, such as deformation of a separator, inside a space housing the cell member caused by an injected electrolyte solution, while also considering case of the injection. A battery includes a plurality of cell members stacked with spacing. Each of the cell members includes a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode. The battery includes a space forming member including a substrate and a frame, a plurality of through holes open inside a space housing the cell member, and a lid covering a portion of the frame, the portion surrounding one side face of the cell member. The lid has a communication hole communicating with the plurality of through holes.

Described is a bipolar storage battery with sufficient stiffness to withstand a force of expansion of cells due to gas generated by corrosion or a force of an impact from the outside, while ensuring air tightness inside the cells and mechanical strength. The battery includes a plurality of cell members stacked with spacing, each including a positive electrode, a negative electrode, and a separator interposed therebetween. The battery includes a space forming member forming a plurality of spaces individually housing the cell members and including a substrate and a frame. The battery includes an outer reinforcing wall facing an outer wall face of the frame and extending from the substrate in a stacking direction of the cell members and the space forming member. An outer hollow space is formed between the outer reinforcing wall and the outer wall face.

Described are a lead-acid battery system and a lead-acid battery life estimation method capable of accurately estimating a remaining life of a lead-acid battery by calculating a capacity turnover (CT) value during operation in consideration of at least one of an upper limit state of charge (SOC) or an upper limit voltage. A CT value calculation unit calculates the CT value during operation using at least one of an upper-limit-SOC-based correction coefficient (KHSOC) calculated based on the upper limit SOC, which is an SOC having the largest value when the lead-acid battery is charged, or an upper-limit-voltage-based correction coefficient (KHV) calculated based on the upper limit voltage, which is the highest voltage when the lead-acid battery is charged.

Described are a lead-acid battery system and life estimation method capable of accurately estimating a remaining life of a lead-acid battery by calculating a capacity turnover (CT) value during operation in consideration of at least one of a lower limit state of charge (SOC) or a low SOC dwell time. A capacity turnover value calculation unit calculates the CT value using at least one of a lower-limit-SOC-based correction coefficient K LSOC calculated based on a lower limit SOC, which is an SOC having the smallest value when the lead-acid battery is charged and discharged once, respectively, or a low-SOC-dwell-time-based correction coefficient K t_LSOC calculated based on a low SOC dwell time t LSOC , which is an elapsed time until the next discharge or charge starts when a discharge ends below a reference SOC.

Described are a lead-acid battery system and a lead-acid battery life estimation method capable of accurately estimating a remaining life of a lead-acid battery by calculating a capacity turnover value during operation in consideration of the number of equalization charges of the lead-acid battery or an overcharge rate integrated value of the equalization charge of the lead-acid battery. The lead-acid battery system estimates the remaining life of the lead-acid battery by comparing a capacity turnover value from the beginning of life to the end of life with the capacity turnover value during operation. A capacity turnover value calculation unit in the lead-acid battery system calculates the capacity turnover value during operation by using an equalization-charge-number-based correction coefficient K CN calculated based on the number of equalization charges or a charge-rate-based correction coefficient K CP calculated based on the overcharge rate integrated value of the equalization charge.