WO2017145893A1

WO2017145893A1 - Lead storage cell

Info

Publication number: WO2017145893A1
Application number: PCT/JP2017/005535
Authority: WO
Inventors: 克実伊藤; 圭石牧; 亮太菊地; 藤森　智貴
Original assignee: 株式会社Ｇｓユアサ
Priority date: 2016-02-22
Filing date: 2017-02-15
Publication date: 2017-08-31
Also published as: JPWO2017145893A1; JP6935795B2

Abstract

The present invention prevents fracturing of a tab part of the positive plate of a lead storage cell. The lead storage cell of the present invention includes at least one plate group provided with a plurality of positive plates and negative plates. The plurality of positive plates of the plate group respectively include a lattice body, a tab part, and a positive-electrode active material. The tab parts of the plurality of positive plates are welded to a strap. In a cross-sectional view of the tab part thickness direction, among the plurality of positive plates, the tab parts of 50% or more of the plurality of positive plates are inclined in the vertical direction, and at least one of the inclined tab parts is inclined in the opposite direction to the other inclined tab parts.

Description

Lead acid battery

The present invention relates to a lead storage battery.

In the process of producing a lead-acid battery, a positive electrode plate and a negative electrode plate are laminated via a separator to produce an electrode plate group, and then the ears of the positive electrode plate are integrated into one electrode plate group and integrated with a positive polarity strap. In addition, the ears of the negative electrode plate are integrated into one electrode plate group and integrated with the negative strap. Specifically, positive polarity is achieved by a method in which a lead alloy piece is brought into contact with the ear portion and then heated by a burner, a method in which the ear portion is immersed in a molten lead alloy and then cooled and solidified. The strap and the negative strap are molded and integrated with the ear portion.

In the lead storage battery, the positive electrode plate expands in volume with repeated charging and discharging. This expansion is particularly noticeable in an overcharged state. This expansion may apply a load to the ear part of the positive electrode plate to cause distortion, and the lead part battery may be vibrated to break the ear part.

In order to prevent breakage of the ear part, Patent Document 1 discloses a configuration in which a taper-like or R-shaped build-up part is formed at the boundary part between the ear part and the strap to improve the mechanical strength.

Patent Document 2 discloses a configuration in which a rib portion is provided at an ear portion to improve mechanical strength.

JP-A-1-89259 JP 7-326359 A

The purpose is to prevent breakage of the ear of the positive electrode plate of the lead-acid battery.

In order to achieve the above object, one aspect of the present invention includes at least one electrode plate group including a plurality of positive electrode plates and negative electrode plates,
The plurality of positive plates of the electrode group each include a grid, ears, and a positive electrode active material, and the ears of the plurality of positive plates are welded to a strap,
In a cross-sectional view in the thickness direction of the ear,
Of the plurality of positive plates, the ears of the positive plates of 50% or more are inclined with respect to the vertical direction,
At least one of the inclined ear portions relates to a lead-acid battery that is inclined in a direction opposite to the other inclined ear portions.

According to the present invention, it is possible to prevent breakage of the ear portion of the positive electrode plate of the lead storage battery.

While the novel features of the invention are set forth in the appended claims, the invention will be further described by reference to the following detailed description, taken in conjunction with the other objects and features of the invention, both in terms of construction and content. It will be well understood.

It is the schematic perspective view which notched some lead acid batteries concerning one embodiment of the present invention. It is a schematic front view which shows an example of the positive electrode plate of FIG. FIG. 2b is a cross-sectional view taken along line IIb-IIb in FIG. 2a. FIG. 2 is a schematic view of a main part for explaining an inclined state of the ears of a plurality of positive electrode plates in the electrode plate group of FIG. 1.

The lead storage battery according to an embodiment of the present invention includes at least one electrode plate group including a plurality of positive electrode plates and negative electrode plates. Each of the plurality of positive electrode plates of the electrode plate group includes a lattice body, an ear portion, and a positive electrode active material, and the ear portions of the plurality of positive electrode plates are welded to the strap. In the cross-sectional view of the ear portion in the thickness direction, the ear portions of the positive electrode plate of 50% or more of the plurality of positive electrode plates are inclined with respect to the vertical direction, and at least one of the inclined ear portions is Inclined in the opposite direction to the other inclined ears.

In the present embodiment, in the electrode plate group including a plurality of positive electrodes, the ears are inclined in the number of positive electrode plates of 50% or more. At this time, at least one of the inclined ears is replaced with another inclined ear. And tilt in the opposite direction. Thereby, even if the positive electrode plate expands during charging (particularly during overcharging), stress distortion due to expansion hardly occurs. Moreover, even if a lead storage battery vibrates, the stress by vibration can be disperse | distributed. Therefore, breakage of the ear portion of the positive electrode plate can be suppressed.

Hereinafter, the present embodiment will be described more specifically with reference to FIGS. 1 to 3. However, these drawings are merely examples, and the present invention is not limited to these drawings.
FIG. 1 is a schematic perspective view in which a part of a lead storage battery according to an embodiment of the present invention is cut away. FIG. 2a is a schematic front view showing an example of the positive electrode plate of FIG. 2b is a cross-sectional view taken along line IIb-IIb in FIG. 2a. FIG. 3 is a schematic diagram of a main part for explaining the inclined state of the ears of a plurality of positive plates in the electrode plate group of FIG. FIG. 3 is a cross-sectional view in the thickness direction of the ear portion, and the ear portion is indicated by a solid line, and a portion other than the ear portion of the positive electrode plate (main part near the ear portion) is indicated by a dotted line.

As shown in FIG. 1, the lead storage battery includes a plurality of electrode plate groups 4. The electrode plate group 4 is accommodated in each cell chamber 5a of the battery case 5 having a plurality of cell chambers 5a together with an electrolytic solution (not shown). The opening of the battery case 5 is sealed with a lid 6.

In the electrode plate group 4, the positive electrode plate 1 and the negative electrode plate 2 are laminated via the separator 3. Each positive electrode plate 1 has an ear 1c for collecting current, and each negative electrode plate 2 also has an ear. The ears 1 c of the positive electrode plate 1 are integrated with the positive electrode strap 7 for each electrode plate group 4. Similarly to the positive electrode plate, the ears of the negative electrode plate are integrated into one negative electrode group 4 and integrated with the negative polarity strap 8. In addition, in FIG. 1, the thickness direction of the ear | edge part was shown with the arrow.

As shown in FIGS. 2a and 2b, the positive electrode plate 1 includes a positive electrode lattice 1a, a positive electrode active material 1b, an ear 1c, and an upper bone 1d. The lattice body is composed of a positive electrode lattice 1a and an upper bone portion 1d. 4 to 15 positive plates are used per cell (that is, per cell chamber).

In the present invention, in an electrode plate group including a plurality of positive electrode plates and negative electrode plates, the ear portions of the positive electrode plates of 50% or more are inclined, and some inclined ear portions and other inclined ear portions are The inclination direction is reverse. When the lead storage battery has a plurality of electrode plate groups, at least one electrode plate group may be configured so that the inclined directions of some inclined ear portions and other inclined ear portions are opposite to each other. In each electrode plate group of the group, the inclined direction may be reversed between some inclined ear portions and other inclined ear portions. One electrode plate group may include a positive electrode plate whose ears are upright in the vertical direction, but the number is preferably smaller. In one electrode plate group, the inclined positive electrode plate is preferably 70% or more, more preferably 90% or more, of the total number of positive electrode plates included in the electrode plate group. From the viewpoint of further enhancing the effect of suppressing breakage of the ears of the positive electrode plate, at least one electrode plate group, the ears of all the positive plates are inclined, and some ears and other ears It is preferable that the inclination direction is reverse. From the same viewpoint, among the plurality of electrode plate groups included in the lead storage battery, in each of the electrode plate groups of 50% or more (preferably 80% or more or 90% or more), the ears of all the positive electrode plates are respectively It is inclined and it is preferable that some ear | edge parts and another ear | edge part are reverse directions. Each electrode plate group may have at least one negative electrode plate, but preferably has a plurality of negative electrode plates so that the positive electrode plates and the negative electrode plates are alternated.

Next, the inclination state of the ear part of the positive electrode plate will be described with reference to FIG. As shown in FIGS. 3A to 3E, the ear portion 1c of each positive electrode plate of the lead storage battery of the invention according to the present embodiment is inclined with respect to the vertical direction in a sectional view in the thickness direction. And at least one ear is inclined in the opposite direction to the other ear.

In FIG. 3, in the cross section in the thickness direction of the ear portion, when the ear portion is inclined to the right side with respect to the vertical direction, the inclination angle is expressed as positive, and when the ear portion is inclined to the left side, it is negative. To represent.

In view of manufacturing variations, in this specification, the inclination of the ear means that the ear is inclined more than 0 degrees in absolute value with respect to the vertical direction in a cross-sectional view in the thickness direction. It is preferable to incline at least 1 degree or at least 1 degree, and may incline at least 3 degrees or at least 5 degrees. The inclination of the ear portion is an absolute value, for example, preferably 10 degrees or less, and more preferably 7 degrees or less. These lower limit values and upper limit values can be arbitrarily combined. The absolute value of the inclination of the ear may be, for example, 0.1 to 10 degrees, 0.1 to 7 degrees, 1 to 7 degrees, 3 to 7 degrees, or 5 to 7 degrees.

3A, the ear 1c has inclination angles of +3 degrees, +3 degrees, +3 degrees, +3 degrees, and -3 degrees in order from the left.

3B, the ear 1c has inclination angles of −5 degrees, +3 degrees, +3 degrees, +2 degrees, and +3 degrees in order from the left.

3 (c), the ear 1c has inclination angles of −2 degrees, +3 degrees, +2 degrees, −2 degrees, and +2 degrees in order from the left.

In FIG. 3D, the ear 1c has inclination angles of +2 degrees, -2 degrees, +3 degrees, +4 degrees, and -3 degrees in order from the left.

3 (e), the ear 1c has inclination angles of +3 degrees, +2 degrees, +4 degrees, -3 degrees, and -3 degrees in order from the left.

In this way, by tilting at least one of the tilted ears in the opposite direction to the other tilted ears, the resistance to distortion due to expansion of the positive electrode plate is improved and the stress applied to the vibration state is dispersed. It becomes possible to make it. Therefore, breakage of the ear portion of the positive electrode plate of the lead storage battery can be prevented.

The position and number of positive electrode plates having ears inclined in one direction (for example, in the positive direction) are not particularly limited. In addition, the absolute value of the inclination angle may be the same for all or some of the ears of the positive electrode plate in the electrode plate group, or may be different for the ears of all the positive electrode plates.

The ears at both ends of the electrode plate group (in FIG. 3, the rightmost and leftmost ears 1c) are preferably inclined toward each other, that is, inward. If comprised in this way, a positive polarity strap can be reduced in size and weight.

For the inclination of the ear part, the ear part of the positive electrode plate or the part of the ear part integrated with the lattice is inserted into a comb-shaped jig having a predetermined inclination angle, and along the inclination angle of the comb-shaped jig. And bending (that is, correcting the inclination angle of the ear).

Examples of the material constituting the positive electrode lattice include lead and lead alloys. The positive electrode only needs to include a lattice body, an ear portion, and a positive electrode active material, and may include a lattice body, an ear portion, and a positive electrode material containing the positive electrode active material. The ear is integrated with the upper part of the lattice. As the material for the ear, lead or a lead alloy can be used as in the lattice. The positive grid may be formed by casting lead or a lead alloy, or may be formed by processing a lead or lead alloy sheet. Examples of the processing method include an expanding process and a punching process.

The positive electrode material may include known components and additives used for the positive electrode plate of the lead storage battery in addition to the positive electrode active material. The positive electrode active material is a material that develops capacity by an oxidation-reduction reaction, and includes, for example, lead dioxide or lead sulfate. The positive electrode active material (or positive electrode material) is usually carried on a positive electrode grid.

The positive electrode plate is a lattice body in which the ears are integrated, the ears are inclined, the positive electrode active material or the positive electrode material is supported on the positive electrode lattice of the lattice body, aged and dried, and usually further chemical conversion treatment is performed. Can be obtained. Either the loading of the positive electrode active material or the bending of the ear may be performed first.

As the material of the strap integrated with the ears of the plurality of positive electrode plates, for example, lead or lead alloy is used in the same manner as the lattice body.

A separator is usually disposed between the negative electrode plate and the positive electrode plate. A well-known thing can be employ | adopted for structures other than the ear | edge part of a positive electrode plate, such as a negative electrode plate, a separator, electrolyte solution, a battery case, a battery case cover.

Although the present invention has been described in terms of the presently preferred embodiments, such disclosure should not be construed as limiting. Various changes and modifications will no doubt become apparent to those skilled in the art to which the present invention pertains after reading the above disclosure. Accordingly, the appended claims should be construed to include all variations and modifications without departing from the true spirit and scope of this invention.

The lead-acid battery of the present invention is industrially useful because it has excellent reliability because the breakage of the ears of the positive electrode plate is suppressed.

DESCRIPTION OF SYMBOLS 1 Positive electrode plate 1a Positive electrode grid 1b Positive electrode active material 1c Ear | edge part 1d Upper part 2 Negative electrode plate 3 Separator 4 Electrode plate group 5 Battery case 5a Cell chamber 6 Lid 7 Positive polarity strap 8 Negative polarity strap

Claims

Including at least one electrode plate group including a plurality of positive electrode plates and negative electrode plates;
The plurality of positive plates of the electrode group each include a grid, ears, and a positive electrode active material, and the ears of the plurality of positive plates are welded to a strap,
In a cross-sectional view in the thickness direction of the ear,
Of the plurality of positive plates, the ears of the positive plates of 50% or more are inclined with respect to the vertical direction,
At least one of the inclined ear portions is a lead storage battery that is inclined in a direction opposite to the other inclined ear portions.
The lead acid battery according to claim 1, wherein in the electrode plate group, the ear portions of the positive electrode plates at both ends are inclined inward.
3. The lead acid battery according to claim 1, wherein an inclination angle of the ear portion with respect to a vertical direction is in a range of 0.1 degrees to 7 degrees in absolute value.