JPWO2020080420A5 - - Google Patents

Claims (5)

A lead-acid battery comprising a positive plate, a negative plate, and an electrolyte,
each of the positive electrode plate and the negative electrode plate includes a current collector and an electrode material held by the current collector;
The current collector has a rectangular frame bone, ears provided on the frame bone, and inner bones inside the frame bone,
The frame bone includes an upper element continuous with the ear, a lower element facing the upper element, and a pair of side elements connecting the upper element and the lower element,
The inner ribs comprise longitudinal ribs extending in a first direction from the top element to the bottom element and transverse ribs extending in a second direction from one side element to the other side element. ,
In a cross section perpendicular to the first direction of the longitudinal bone, a striped pattern of metal fibrous tissue can be seen,
The outer peripheral region of the cross section is composed of a first portion in which the fibrous tissue extends along the contour of the cross section and a second portion other than the first portion,
A ratio of the length of the contour corresponding to the second portion to the total length of the contour of the cross section is less than 50%,
A lead-acid battery, wherein _{a ratio t b /t a of the inner bone thickness t b to} the ear thickness t _a is 60% or more and 97% or less. The positive electrode plate and the negative electrode plate are alternately laminated via a separator to form an electrode group,
2. The lead-acid battery according to claim 1, wherein said electrode group is pressurized in the stacking direction. The pull-out load of the electrode group is 1.6 times or more the self weight of the electrode group,
The lead-acid battery according to claim 1 or 2 The lead-acid battery according to any one of claims 1 to 3, wherein the positive electrode material contains Sb. A method for manufacturing the lead-acid battery according to any one of claims 1 to 4,
preparing a current collector;
obtaining the positive electrode plate or the negative electrode plate including the current collector;
The step of preparing the current collector includes
preparing a rolled plate;
forming an intermediate lattice body having a plurality of intermediate ribs formed in a lattice shape by punching the rolled plate;
forming at least a part of the inner bone by pressing the intermediate lattice from the thickness direction of the intermediate lattice,
In at least a portion of the plurality of intermediate bones, the press working is performed so that at least one end portion in the bone width direction is thinner than a central portion in the bone width direction intersecting the extending direction of the intermediate bones, and thickness t _a The thickness t of the central portion with respect to _b proportion of t _b /t _a A method for manufacturing a lead-acid battery, including deforming so that the is 60% or more and 97% or less.