公开(公告)号：US20230402656A1

公开(公告)日：2023-12-14

申请号：US18032265

申请日：2021-11-04

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： SATOSHI FUJIYOSHI

IPC: H01M10/28 ,  H01M50/186 ,  H01M50/107 ,  H01M10/04

CPC classification number: H01M10/288 ,  H01M50/186 ,  H01M50/107 ,  H01M10/049

Abstract: A method for manufacturing an alkaline dry battery includes first to third steps. In the first step, a hollow cylindrical first positive electrode pellet including a first end face and a second end face is prepared in an axial direction is prepared. In the second step, a hollow cylindrical positive electrode pellet group including the first positive electrode pellet is inserted into a case to obtain a positive electrode inscribed in the case. At this time, the first positive electrode pellet is disposed on the most opening side of the case such that the first end face faces an opening side of the case. In the third step, an annular groove is provided in a side part of the case. The first positive electrode pellet includes a tapered part whose outer diameter decreases from the second end face toward the first end face, and in a cross section along the axial direction of the first positive electrode pellet, an inclination angle θ of the tapered part with respect to an axis of the first positive electrode pellet ranges from 0.26° to 0.87°, inclusive. A distance h between the groove and the first end face ranges from 0.55 mm to 2.35 mm, inclusive.

公开(公告)号：US20250118769A1

公开(公告)日：2025-04-10

申请号：US18836340

申请日：2022-12-23

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： JUN NUNOME ,  SATOSHI FUJIYOSHI

IPC: H01M6/06 ,  H01M4/02 ,  H01M4/06 ,  H01M4/38 ,  H01M4/50 ,  H01M50/489

Abstract: An alkaline dry cell includes a cathode, an anode, a separator disposed between the cathode and anode, and an electrolyte held within the cathode, anode, and separator. The cathode includes manganese dioxide. A width at half maximum W of a (110)-plane diffraction peak in an X-ray diffraction pattern of the manganese dioxide is 2.4° or less. The anode includes powder of an anode active material including zinc. Particles s of the powder with particle diameters 75 μm or less account for 33% by mass or more of all particles of the powder. A thickness of the separator is 150 μm or more and is 210 μm or less.

公开(公告)号：US20250029981A1

公开(公告)日：2025-01-23

申请号：US18682629

申请日：2022-07-11

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： SATOSHI FUJIYOSHI ,  JUN NUNOME

IPC: H01M4/24 ,  H01M4/02 ,  H01M6/08

Abstract: An alkaline dry battery includes a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode. The positive electrode contains electrolyte and the negative electrode contains electrolyte. The positive electrode further contains electrolytic manganese dioxide, sodium, and zinc. The electrical potential of the electrolytic manganese dioxide is 300 mV or higher and 340 mV or lower with respect to that of a reference electrode made of mercury oxide. The content of the sodium in the positive electrode is 800 ppm by mass or more and 3000 ppm by mass or less. The content of the zinc in the positive electrode is 2400 ppm by mass or more and 4600 ppm by mass or less.