WO2006061872A1

WO2006061872A1 - Tubular lead battery

Info

Publication number: WO2006061872A1
Application number: PCT/JP2004/018124
Authority: WO
Inventors: Nobukazu Tanaka; Satoshi Minoura; Kenichi Maeda
Original assignee: Shin-Kobe Electric Machinery Co., Ltd.
Priority date: 2004-12-06
Filing date: 2004-12-06
Publication date: 2006-06-15

Abstract

A tubular lead battery (1) comprising a plate group (2) where a stripe negative plate (4) provided, at one end side in the width direction, with a plurality of negative electrode side lugs (4a to 4e), and a stripe positive plate (5) provided, at one end side in the width direction, with a plurality of positive electrode side lugs (5a to 5e) are wound spirally so as to overlap via a separator, and a negative electrode side strap (11) and a positive electrode side strap (12) arranged on one axial end side of the plate group and connected, respectively, with the plurality of negative electrode side lugs and the plurality of positive electrode side lugs, wherein an incompletely welded portion is prevented from being formed at the joint of each strap and lug. The plurality of negative electrode side lugs and the plurality of positive electrode side lugs being arranged sequentially from he radial inside toward outside of the plate group are shifted, in position, alternately to the different sides in the circumferential direction of the plate group so that they are not aligned along the radial direction of the plate group.

Description

Specification

Cylindrical lead storage battery

Technical field

The present invention relates to a cylindrical lead-acid battery in which an electrode plate group configured to have a cylindrical shape as a whole is accommodated in a battery case having an inner side formed in a cylindrical shape.

Background art

As disclosed in Patent Documents 1 and 2, the electrode plate group used in the cylindrical lead storage battery is a separator in which a negative electrode plate and a positive electrode plate formed in a band plate shape are impregnated with an electrolytic solution. It has a spirally wound structure so as to overlap with each other. At one end in the width direction of the negative electrode plate and the positive electrode plate, a plurality of negative electrode side ear portions and positive electrode side ear portions are provided in a state of being spaced apart in their respective longitudinal directions. The negative electrode side ear portion and the positive electrode side ear portion also have a protruding force rising from the end edge portion of one end of the negative electrode plate and the positive electrode plate in the width direction. In this type of storage battery, with the negative electrode plate and the positive electrode plate spirally wound, a plurality of negative electrode side ear portions and positive electrode side ear portions are respectively disposed in different turns of the negative electrode plate and the positive electrode plate, A distance between the plurality of negative electrode side ears and the mutual distance between the positive electrode side ears are set so as to sequentially line the outside in the radial inner force.

In conventional storage batteries of this type, as also shown in Patent Documents 1 and 2, a plurality of negative electrode side ears and a plurality of positive electrode side ears are aligned in a row in the radial direction of the electrode plate group. A negative ear and a positive ear are provided so as to be arranged in a state!

As described above, after forming the electrode plate group in which the plurality of negative electrode side ear portions and the positive electrode side ear portion protrude from the one end side in the axial direction, the negative electrode side ear portion protruding at one end of the electrode plate group and The positive electrode side ear portion is inserted into the negative electrode side strap molding die and the positive electrode side strap molding die and dipped in the molten lead placed in the respective dies. Then, when the surface layer portions of the negative electrode side ear portion and the positive electrode side ear portion immersed in the molten lead are melted, the lead in the negative side strap molding die and the positive side strap molding die is cooled and hardened. The negative side strap and the positive side strap are molded in a state in which they are integrally connected to the negative side ear portion and the positive side ear portion. A plurality of each of these negative side straps and positive side straps The negative side ear parts and the positive side ear parts are electrically connected. The negative pole side strap and the positive pole side strap are formed with pole posts on the negative pole side and the positive pole side, respectively, and the negative pole terminal and the positive pole terminal are connected to these pole posts, respectively.

Patent Document 1: Japanese Patent Application Laid-Open No. 2004-178833

Patent Document 2: Japanese Patent Application Laid-Open No. 2002-358955

Disclosure of the invention

Problem that invention tries to solve

In the above lead-acid battery, the tip force of each ear is also a partial force of a predetermined length S strap in order to improve the electrical and mechanical connection between each strap and the ear. Each ear needs to be welded to the strap while it is embedded inside. Therefore, in the negative side strap and the positive side strap welded to the negative side ear and the positive side ear, the thickness of the portion located between the respective side ears must be equal to or greater than the set value.

[0006] A conventional cylindrical lead-acid battery, in which a plurality of negative electrode side ears and a plurality of positive electrode side ears are provided so as to be aligned in a line in the radial direction of the electrode plate group. When immersed in molten lead in the negative electrode side strap molding die and in the positive electrode side strap molding die, the negative electrode side ear portion and the positive electrode side ear portion melt between the multiple ear portions, respectively. There was a case where lead did not flow smoothly. As a result, the thickness of part of each strap is thinner than the design value, and incomplete welding may be formed at the connection between each strap and the ear, which may reduce the current collection performance of the strap. The

[0007] An object of the present invention is to prevent formation of defective welds in the connection portion between a plurality of negative electrode side ear portions and a negative electrode side strap and the connection portion between a plurality of positive electrode side ear portions and a positive electrode side strap. It is an object of the present invention to provide a cylindrical lead-acid battery which is capable of this.

Means to solve the problem

According to the present invention, a strip-like negative electrode plate having a plurality of negative electrode side ears provided on one end side in the width direction, and a positive electrode plate having a plurality of positive electrode side ears provided on the one end side in the width direction An electrode plate group spirally wound so as to overlap with each other, and a negative electrode side disposed on one end side in the axial direction of the electrode plate group and connected respectively to a plurality of negative electrode side ears and a plurality of positive electrode side ears The It applies to the cylindrical lead acid battery provided with the trap and the positive electrode side strap. In a lead-acid battery to which the present invention is applied, a plurality of negative electrode side ears and a plurality of positive electrode side ears are provided on different turns of a negative electrode plate and a positive electrode plate wound respectively in a spiral.

In the present invention, each of the plurality of negative electrode side ear portions and the plurality of positive electrode side ear portions arranged sequentially from the inner side to the outer side in the radial direction of the electrode plate group are in the radial direction of the electrode plate group. In order to prevent alignment along the grid, it is provided so as to align in zigzags alternately on different sides of the plate group in the circumferential direction! /.

[0010] As described above, the radial inner force of the electrode assembly is aligned along the radial direction of the electrode assembly with the plurality of negative electrode side ears and the plurality of positive electrode side ears arranged sequentially toward the outer side. As described above, when the positions are shifted alternately on different sides of the electrode plate group in the circumferential direction, the negative electrode side ear portion and the positive electrode side ear portion are respectively molded into a negative electrode side strap molding mold after forming the electrode plate group. When immersed in molten lead in the inner and positive electrode side strap molds, the flow of the molten lead can be smoothly generated between the plurality of ears. Therefore, the thickness of the portion of each strap located between the ears is prevented from being insufficient, and each strap is formed without causing incomplete welding at the connection between each strap and the ears. can do.

[0011] In a preferred aspect of the present invention, when the dimension of each ear measured in the circumferential direction of the electrode plate group is the length dimension of each ear, the ear members positioned on the outer side in the radial direction of the electrode plate group A plurality of negative electrode side ears and a plurality of positive electrode side ears are formed so that the length dimension becomes larger, and a plurality of negative electrode side ears and a positive electrode side are provided with a negative electrode side arrangement region and a positive electrode. It is placed in the side ear placement area. In this case, the negative electrode side strap and the positive electrode side strap are formed to have a fan-shaped contour shape corresponding to the contour shape of the negative electrode side ear portion arrangement region and the positive electrode side ear portion arrangement region, respectively.

As described above, when the length dimension of the ear portion is lengthened and lengthened from the inner side to the outer side in the radial direction of the electrode plate group, the connection portion between the negative electrode plate and the negative electrode side strap, the positive electrode plate and the positive electrode side Since the cross-sectional area of the connection portion with the strap can be increased, the current collection performance can be enhanced to improve the noise performance.

In the cylindrical lead-acid battery according to the present invention, the battery case housing the electrode plate group has a cylindrical shape on the inner side, and the outer shape of the battery case is cylindrical or prismatic. Whatever It's a shape too. Further, the present invention can be applied to a battery pack in which an electrode plate group is stored in each cell chamber of a battery case having a plurality of cell chambers having a cylindrical inner side.

Effect of the invention

As described above, according to the present invention, the plurality of negative electrode side ear portions and the plurality of positive electrode side ear portions sequentially arranged outward toward the inner side in the radial direction of the electrode plate group Since the plurality of negative electrode side ears and the positive electrode side ears are not aligned in the radial direction of the electrode plate group by alternately providing the positions on different sides of the plate, the electrode plate group is configured. After that, when forming the negative electrode side strap and the positive electrode side strap respectively connected to the negative electrode side ear portion and the positive electrode side ear portion, it is possible to improve the molten metal flow around the plurality of ear portions. Can. Therefore, it is possible to prevent the insufficient thickness of the portion of each strap located between the ears, and to prevent the formation of a defective welding at the connection between each lug and the strap. It is possible to prevent the deterioration of the current collection performance of the storage battery due to the molding defect of the strap. Brief Description of the Drawings

[FIG. 1] FIG. 1 is a cross-sectional view showing an example of the structure of a cylindrical lead-acid battery according to the present invention.

[FIG. 2] FIG. 2 is a plan view showing an example of an electrode plate group used in a cylindrical lead-acid battery according to the present invention.

[FIG. 3] FIG. 3 is a plan view of the main part of the storage battery shown in FIG.

[FIG. 4] FIG. 4 is a cross-sectional view of a plate group and a strap taken along line IV-IV shown in FIG.

[FIG. 5] FIG. 5 is a cross-sectional view for explaining a method of forming a strap connected to a plate group.

[FIG. 6] FIG. 6 is a cross-sectional view taken along the line VI-VI in FIG.

[FIG. 7] FIG. 7 is a plan view of the main part showing a plate group and a strap of a conventional storage battery.

[FIG. 8] FIG. 8 is a cross-sectional view of the main parts showing a plurality of ears provided in the electrode plate group and a strap connected to the ears in the embodiment of the present invention.

Explanation of sign

[0016] 1 cylindrical lead storage battery Double plate group

3 Battery case

4 Negative plate

4a to 4e negative side ear

5 Positive plate

5a to 5e positive side ear

6, 7 separators

8 Negative ear area

9 Positive side ear placement area

11 Negative side strap

12 positive side strap

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a cross-sectional view schematically showing the structure of a cylindrical lead-acid battery 1 according to the present invention. The illustrated battery 1 has an electrode plate group 2 formed to have a cylindrical shape as a whole, and An inner side containing the plate group 2 is provided with a cylindrical battery case 3. The battery case 3 is composed of a cylindrical main body 3A and a lid 3B for sealing the opening at the upper end of the main body 3A. The main body 3A and the lid 3B are formed of an insulator.

As shown in FIG. 2, electrode plate group 2 is spirally wound so that strip-shaped separators 6 and 7 intervene between strip-shaped negative electrode plate 4 and strip-shaped positive electrode plate 5. Have a structure that The negative electrode plate 4 has a plurality of arc-shaped negative electrode side ear portions 4a, 4b, ···, 4e that are erected at the end edge portion on one end side in the width direction. Similarly, the positive electrode plate 5 has a plurality of arc-shaped positive electrode side ear portions 5a, 5b, ···, 5e standing from the end edge portion on one end side in the width direction.

The negative electrode plate 4 is composed of a negative electrode grid body formed in a strip shape and a negative electrode active material held by the negative electrode grid body, and one end in the width direction of the negative electrode grid body has negative electrode side ear portions 4a to 4e. The body is formed. Similarly, the positive electrode plate 5 is made up of a strip-shaped positive electrode grid body and a positive electrode active material held by the grid body, and one end of the positive electrode grid body in the width direction is a positive electrode side ear 5a, V, or 5e. -Formed in the body! [0020] The plurality of negative electrode side ears 4a and 4e and the plurality of positive electrode side ears 5a and 5e each have the negative electrode plate 4 and the positive electrode plate 5 wound in a spiral shape. It is disposed in different turns of the positive electrode plate 5, and is provided so as to be sequentially arranged outward in the radial inner force of the electrode plate group 2. The negative electrode side ears 4a to 4e and the positive electrode side ears 5a to 5e have the respective dimensions measured in the circumferential direction of the electrode plate group 2 as the length dimension L of each ear (see FIG. 2). It is formed so that the length dimension may become large, so that the ear part located in the radial direction outer side of 2.

In the illustrated example, five ears are provided for each of the negative electrode plate 4 and the positive electrode plate 5, but in the present invention, the number of ears provided on each electrode plate is arbitrary.

In the present invention, from the inner side to the outer side in the radial direction of the electrode group 2 so that the plurality of negative electrode side ears do not align along the radial direction of the electrode group 2, A plurality of negative electrode side ears 4a, 4b, · · · · · · 4e are provided so as to be alternately arranged on different sides of the electrode plate group in the circumferential direction in a zigzag. Similarly, the plurality of positive electrode side ears 5a, 5b, · · · · · · · · · · · · · · 力径力径径外側向向向向向向向向交互位置位置位置A plurality of negative electrode side ear portions 4a, 4b, · · · · · · · 4e and a positive electrode side ear portion 5 a 8 and disposed in the positive electrode side ear placement area 9.

The negative electrode side ears 4a, 4b, · · · · · 4d and the positive electrode side ears 5a, 5b · · · · · 5d are arranged symmetrically, and the negative electrode side ears 4a, 4b · · · · 4e and the positive electrode In order to connect each of the side ears 5a, 5b, ····, 5e to each other, it has a fan-shaped contour corresponding to the contour of the negative side ear mounting area 8 and the positive side ear mounting area 9 The negative side strap 11 and the positive side strap 12 are molded integrally with the negative side ear 4a, 4b, 4e and the positive side ear 5a, 5b, 5e by the Force-Cos (Cast-On-Strap) method Ru. Referring to FIGS. 3 and 4, the structure of the connection portion between the negative electrode side ears 4a, 4b, ..., 4e and the negative electrode side strap 11 is shown. Positive electrode side ears 5a, 5b, · · · · 5e and positive electrode The connection with the side straps 12 is likewise configured!

The negative electrode side strap 11 and the positive electrode side strap 12 are provided with negative electrodes 11A and 12A on the negative electrode side and the positive electrode side, respectively. The pole columns 11A and 12A on the negative electrode side and the positive electrode side are led to the outside through the lid 3B of the battery case, and these pole columns 11A and 12A respectively The negative terminal and the positive terminal (not shown) are connected.

When forming the negative electrode side strap 11 and the positive electrode side strap 12 by the COS method, after the electrode plate group 2 is formed, the negative electrode side ear 4a which has the one end force of the electrode plate group 2 also protrudes. The side ears 5a and the like 5e are inserted into the negative electrode side strap molding die and the positive electrode side strap molding die and dipped in molten lead in the respective dies.

Referring to FIG. 5, a mold 21 for molding the negative electrode side strap, a part of the electrode plate group 2 and a negative electrode side ear 4a, 4e inserted in the mold 21 are shown. Ru. The negative electrode side strap molding die 21 has a mold hole 21A for molding the negative electrode side strap 11 and the pole post 11A, and molten lead 22 is injected into the mold hole 22A. When forming the negative electrode side strap 11, the negative electrode side ear portions 4a to 4e are inserted into the mold 21 in a state where the lead 22 is melted, and the tip force of the ear portions 4a, 4e is also a predetermined length. A portion of the stem (eg, approximately 30% of the total length of the ear) is immersed in the lead 22.

[0027] Although not shown, the mold for molding the positive side strap is constructed in exactly the same manner! At the same time as the negative side ear parts 4a to 4e are inserted into the mold for forming the negative side strap. The positive electrode side ear portions 5a to 5e are inserted into the positive electrode side molding die, and the tip force of the positive electrode side ear portions 5a to 5e is immersed in the melted lead at a predetermined length.

[0028] When the ears 4a, 4e, 5a, 5e are immersed in the molten lead, the surface portion of each ear is melted. In the illustrated electrode plate group 2, the heat capacity is different because the radial inner force is also different in the size of the ear portion sequentially arranged on the outer side. The heat capacity of the radially innermost ears 4a and 5a of the electrode group is the smallest, and the heat capacity of the radially outermost ears 4e and 5e is the largest. Therefore, it begins to melt at the ear force located at the inner side in the radial direction of the plate group 2. When the surface layer portions of the negative electrode side ear portion and the positive electrode side ear portion immersed in the molten lead are sufficiently melted, the lead in the negative electrode side strap molding die and the positive electrode side strap molding die is cooled and hardened. A negative electrode side strap 11 and a positive electrode side strap 12 integrally formed with the negative electrode side ear 4a and the positive electrode side ear 5a are molded.

When the negative electrode side ears 4a, 4b, ... and the positive electrode side ears 5a, 5b, ... are arranged in the radial direction of the electrode plate group as shown in FIG. Positive side strap 1 2 (When the positive side strap 12 is not shown in FIG. 7), it is difficult to generate a flow of molten lead smoothly between the ears when forming each of them. The thickness of the portion to be placed is insufficient, and the length of the portion to be embedded in the strap of the ear portion is short, and the connection between the ear portions 4a, 4b, ... and 5a, 5b, ... and the straps 11 and 12 Poor welds may form on the part.

[0030] In order to sufficiently pour the molten lead between the ears, it is conceivable to sufficiently prolong the time for cooling the molten lead after immersing the ears in the molten lead. In this case, the ear portions 4a and 5a having a small heat capacity existing inward in the radial direction of the electrode plate group are melted away, and a connection failure between the ear portion and the strap is generated inside the electrode plate group in the radial direction. Will occur.

[0031] If the distance between the ears is increased by reducing the number of the ears 4a, 4b, ... and 5a, 5b, ..., the flow of molten lead between the ears can be smoothened. It is possible to prevent poor connection between the ear and the strap, but it is not preferable to reduce the number of ears because the current collection performance is reduced.

On the other hand, as shown in FIG. 6, each of the negative electrode side ears 4a, 4b,... And the positive electrode side ears 5a, 5b, ··· should be aligned along the radial direction of the electrode group 2 In the radial direction of the plate group 2, the negative side ears 4a, 4b,... And the positive side ears 5a, 5b,. When the negative electrode side strap 6 and the positive electrode side strap 7 are respectively formed, the molten lead can be made to flow smoothly between the ears when the negative electrode side strap 6 and the positive electrode side strap 7 are separately formed. Whether the welding is defective at the connection between the ear and the strap, it prevents the length of the part embedded in the strap of each ear from being insufficient both inside and outside in the radial direction of the electrode assembly. It can be prevented from being formed. Example

Using a lead alloy foil having a thickness of 0.7 mm, a lattice was formed to be a strip-shaped electrode plate substrate having a width of 80 mm and a length of 600 mm. The lattice was filled with an active material paste obtained by kneading lead powder having a degree of oxidation of 70% and dilute sulfuric acid, and then dried to obtain a positive electrode plate. Further, a negative electrode active material paste obtained by kneading a lead powder having a 70% acidity, a small amount of carbon powder, lignin, a barium compound and dilute sulfuric acid is filled in the above grid body and then dried. I made a board. A spiral is formed so that the positive electrode plate and the negative electrode plate overlap through the separators 6 and 7 made of glass mat. The plate group 2 was formed by winding in a shape, and a strap integrally connected to the plate group 2 was formed by the COS method. In this example, six ears were formed on each of the negative electrode plate and the positive electrode plate. FIG. 8 shows six ears 4a to 4 ^ formed on the negative electrode plate and a negative side strap 11 connected to these ears. In the experiment, a portion of the negative electrode strap 11 positioned between the ears of the negative electrode strap 11 is taken as a measurement point of thickness, as shown in FIG. The average thickness of the strap at these measurement points S1 !, S5 was measured as S5.

Further, for comparison, six negative electrode side ears 4a to 4f are formed in alignment in the radial direction of the electrode plate group similarly to the example shown in FIG. 7, and six positive electrode side ears are similarly formed. Comparative Example 1 in which the negative side strap and the positive side strap were formed aligned in the radial direction of the plate group, and the three negative side ears and the three positive side ears were respectively formed in the radial direction of the electrode plate group. The comparative example 2 in which the negative side straps and the positive side straps are formed is formed in alignment with each other, and the average thickness of the portions positioned between the ear portions of the negative side straps of these comparative examples The measurement was made at each measurement point determined in the same manner as in Example 1. In the electrode plate group used in Comparative Example 1, the arrangement of the ear parts is different from that in the above-described embodiment, and in Comparative Example 2, the arrangement of the ears and the number of the ear parts are different from those in the previous embodiment. It is configured in the same way.

The measurement results of the thickness of the strap of the example of the present invention and the measurement results of the thickness of the strap of Comparative Examples 1 and 2 are shown in Table 1. The design value of the thickness between the ears of the strap is 5 [mm] in each of the embodiment of the present invention and the comparative examples 1 and 2.

[Table 1]

Measurement location Design value (mm) Example (mm) Comparative example 1 (mm) Comparative example 2 (mm)

Si 5.2 4.3 5.3

S2 5.3 4.1 5.0

S3 5.1 3.9-Struff thickness 5.0

S ₄ 5.2 4.1

s ₅ 5.0 4.2-

5.1 6 4.1 2 5.15 As is apparent from Table 1, in Comparative Example 2 in which the number of ears is reduced, the flow of molten lead is smoothly performed between the ears, which has a large distance between the ears. The thickness of the strap at S1 and S2 between the ears reached the design value. However, in Comparative Example 1 in which the number of ears was increased, flow of molten lead was not smoothly performed between the ears, and the straps of the straps S1 to S5 were installed between the ears. The thickness did not reach the design value. On the other hand, in the examples to which the present invention was applied, the thickness of the strap between the ears reached the design value although the number of ears was the same as in Comparative Example 1. From this experimental result, according to the present invention, even when the number of ears is large, the flow of molten lead between the ears of the strap can be smoothly performed, and the thickness between the ears of the strap can be increased. It can be seen that the design value can be prevented from falling below, which can prevent the formation of weld defects at the connection between the strap and the ear.

Industrial applicability

As described above, according to the present invention, the negative electrode side connecting the plurality of negative electrode side ear portions and the plurality of positive electrode side ear portions respectively formed on the negative electrode plate and the positive electrode plate constituting the electrode plate group When forming the strap and the positive side strap, the thickness of the portion of each strap located between the ears is insufficient to prevent the formation of weld defects at the connection between each strap and the ears. be able to. Therefore, the present invention is useful in the industrial field of lead-acid batteries because it helps to improve the yield in manufacturing cylindrical lead-acid batteries and also to improve the performance and reliability of the batteries. .

Claims

The scope of the claims

[1] A band-like negative electrode plate provided with a plurality of negative electrode side ear parts at one end side in the width direction and a positive electrode plate provided with a plurality of positive electrode side ear parts at one end side in the width direction An electrode plate group wound in a spiral shape, and a negative electrode strap disposed at one end side in the axial direction of the electrode plate group and connected to the plurality of negative electrode side ears and the plurality of positive electrode side ears, respectively. And a positive electrode side strap, wherein the plurality of negative electrode side ears and the plurality of positive electrode side ears are respectively provided on different turns of the negative electrode plate and the positive electrode plate spirally wound. A storage battery,

The inner force in the radial direction of the electrode plate group The plurality of negative electrode side ears and the plurality of positive electrode side ears sequentially arranged outward are not aligned along the radial direction of the electrode plate group, respectively. A cylindrical lead-acid battery which is provided so as to be alternately arranged in zigzags on different sides in the circumferential direction of the electrode plate group.

[2] When the dimension of each ear measured in the circumferential direction of the electrode plate group is the length dimension of each ear, the length of the ear portion located radially outward of the electrode plate group The plurality of negative electrode side ears and the plurality of positive electrode side ears are formed so as to increase in size !, and the plurality of negative electrode side ears and the positive electrode side ears each have a fan-shaped negative electrode side arrangement region And the positive electrode side ear placement area,

The negative electrode side strap and the positive electrode side strap are formed to have a fan-shaped contour shape corresponding to the contour shape of the negative electrode side ear portion arrangement region and the positive electrode side ear portion arrangement region, respectively. The cylindrical lead acid battery of description.