US441818A - Electrode for secondary batteries - Google Patents

Description

(N0 M d 1.)

6 J. 'Y. BBADBURY & F. J. STONE. ELECTRODE FOR SECONDARY BATTERIES.

No. 441,818. Patented Dec. 2, 1890.

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J OSEPII Y. BRADBURY AND FRANK J. STONE, OF LOlVELL, MASSACHUSETTS.

ELECTRODE FOR SECONDARY BATTERIES.

SPEGIFICATION forming part of Letters Patent No. 441,818, dated December 2, 1890.

Application filed November 16, 1889. Serial No. 330,514. (No model.)

To all whom it may concern.-

Be it known that we, JOSEPH Y. BRADBURY and FRANK J. STONE, both citizens of the United States, residing at Lowell, in the county of Middlesex and Commonwealth of Massachusetts, have invented a certain new and useful Improvement in Electrodes for StorageBatteries, of which the following is a specification.

Our invention relates to electrodes for storage or secondary batteries; and it consists in an electrode comprising a plate of supporting material having its opposite faces formed into alternate projections and depressions for the reception of active material, two opposite sides of each of said depressions being open and laterally adjacent projections opening into each other, and said plate being preferably formed of strips of supporting material arranged side by side, and each offset alternately in opposite directions for the reception of active material.

In the accompanying drawings, Figure 1 is an isometric perspective view of an electrode constructed according to our improvement; Fig. 2, an isometric perspective View of two non-adjacent strips of the supporting material and some pencils of active material arranged in the offsets of said strips 5 Fig. 3,an isometric perspective View of parts of some strips of supporting material formed from a single sheet of metal and not entirely separated from each other in the process of formation.

In Fig.1, A represents the frame, which may be made of the same conducting material as the supporting-strips, preferably thin, sheetlead, a strip a. of which is turned at each edge to form flanges a, which are then cut vertically at a to allow the portions of the flanges adjacent to the cuts a to pass each other, and thereby to allow the strip a to be bent into the form of a rectangle. The ends of the strip a after being so bent are united by solder, and the overlapping parts of the flanges at the corners of the frame may also be united by solder, or in both the cases the parts may be burned together instead of being soldered; but before the frame is thus like the different-colored squares of acheckerboard andthe depressions in each strip opening into the depressions of the contiguous strips.

The strips 1) b may be separately formed and slightly united by solder or burned to gether where they come in contact with each other. It is possible, however, to make all the strips of a single electrode from a single sheet by punches arranged above and below or on opposite sides of the sheet, which alternately raise and depress the surface of the sheet and separate the strips from each other,

' except where the portions of contiguous strips after bending lie in the same plane, as at b in Fig. 3; but this specific construction is not herein claimed. The ends of the strips may be bent or rolled over, as shown at b in Fig. 3, to stiffen the upper and lower edges of the plate B, whether they are formed from a sheet without separation from each other, or whether they are separately formed, in which last case the ends of the strips may be wrapped around one or more strips of lead and burned or soldered to said last-named strips.

In the depressions of the plate B, formed in either of the ways above' described, may be placed the active material by any wellknown process, as in the form of paste or in the form of powder, compactly pressed into the depressions of the plate. \Ve prefer, however, to make the active material into bars or pencils 0, as shown in Fig. 2, by compressing said material in molds under hydraulic or other heavy pressure, and then inserting said pencils endwise into the side of the plate, so that contiguous strips of the supporting material pass alternately in front and back of said pencils, and the pencils Will thereby be retained in place and will be prevented from moving endwise by the frame after said plate B is placed in the frame. r

The plate B may be formed by casting in a mold, preferably under pressure.

The pencils are represented in the drawings as being rectangular in cross-section but obviously the shape of their cross-section is immaterial, as the pencils may be round, triangular, or hexagonal, or otherwise shaped in a cross -section, Without departing from the spirit of our invention; but they are preferably rectangular in cross-section, merely because this shape allows of a great amount of active material in an electrode of a given uniform thickness.

We claim as our invention 1. An electrode for secondary batteries, comprising a plate of supporting material having lateral perforations and openings at intervals from said perforations through the faces of said plate, said perforations and openings being adapted for the reception of active material, and the faces of said plate being unbroken except by said openings, said openings and the closed spaces in each face alternating With each other like the differentcolored squares of a checker-board, as and for the purpose specified.

2. An electrode for secondary batteries, comprising a plate of supporting material having lateral perforations and openings at intervals leading from said perforations through the opposite faces of said plate, said openings alternating with each other on the opposite faces of said plate, and said perforations and openings being for the reception of active material, as and for the purpose specified.

3. An electrode for secondary batteries, comprising a plate of supporting material having its opposite faces formed into alternate projections and depressions for the reception of active material, two opposite sides of each of said depressions being open, the laterallyadjacent depressions opening into each other, as and for the purpose specified.

4. An electrode for secondary batteries, comprising a plate consisting of strips of supporting. material arranged edge to edge and each offset alternately in opposite direct'ions' for the reception of active material, as and for the purpose specified.

5. An electrode for secondary batteries, consisting of a plate of supporting material having its opposite faces formed into alternate projections and depressions, two opposite sides of each of said depressions being open, the laterally-adjacent depressions opening into each other, and pencils or bars of active material inserted in said depressions, as and for the purpose specified.

6.'An electrode for secondary batteries;

consisting of a plate made up of strips of supporting material arranged edge to edge and each offset alternately in opposite directions, and pencils or bars of active material inserted in said oifsets, as and for the purpose specified.

In Witness whereof We have signed this specification, in the presence of two attesting Witnesses, this 7th day of November, A. D. 1889.

JOSEPH Y. BRADBURY. FRANK J. STONE.

Witnesses:

ALBERT M. MOORE, JOHN I. COGGESHALL.

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