JP3303462B2 - Sealed lead-acid battery - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealed lead-acid battery, and more particularly to a connection structure between cells in a battery case and an input / output terminal.

[0002]

2. Description of the Related Art FIG. 6 is a perspective view of a conventional sealed lead-acid battery.

[0003] As shown in FIG.
There are a plurality of cell chambers 3 divided by the above, and each cell chamber 3 accommodates an electrode plate group in which a plurality of positive and negative electrode plates are alternately arranged via a separator.

Further, a through hole 4 for connecting cells is provided in the upper part of the partition wall. As shown in the enlarged view of the upper part of the battery case in FIG. 7, a positive electrode terminal 6 or a negative electrode terminal 7 is connected to a strap 5 to which ears of the same polarity are connected. The positive and negative terminals of the cell to be connected are connected by an inter-cell connector 8 penetrating through the through hole 4.

[0005] The opening of the battery case 1 is covered with a lid 9.
The upper end of the partition wall 2 and the lower end of the partition plate 10 provided on the lid are heat-welded together with the peripheral edges of the battery case and the lid.

The input / output terminal 20 provided on the lid is formed by integrally integrating a lead alloy bolt and a copper alloy seat (nut). Buried in a lead alloy bushing provided on the upper surface of the lid.

[0007]

However, in the conventional structure, the upper end surface of the partition wall is almost the same height as the upper end of the battery case, and a through hole of the inter-cell connector is provided on the upper part of the partition wall. Had been.

On the other hand, the electrode group has ears on the positive and negative electrodes, and a strap for connecting them is formed on the upper part of the ear, and a positive or negative terminal is connected to the upper surface of the strap. .

For this reason, the height of each electrode plate is the height obtained by subtracting the height of the terminal, the thickness of the strap, and the height of the electrode plate ears from the upper end of the battery case. There was no large dead space.

[0010] The size of the electrode plate is smaller than the size of the battery case, and the capacity of the battery is reduced. As a result, the battery has a low energy density per volume.

When connecting a lead wire having an O-shaped ring-shaped washer at one end to the input / output terminal 20, the washer was fitted into the bolt and fixed by a nut.

The bolt of the input / output terminal is made of a copper alloy, and if a washer is inserted into the bolt and tightened with a nut, the bolt may be broken because the strength of the bolt portion is low.

The present invention has been made to solve these problems, and accommodates an electrode plate as large as possible in a battery case to increase the battery capacity to increase the energy density per unit volume and to reduce the strength of the input / output terminal portion. An object of the present invention is to provide an excellent sealed lead-acid battery.

[0014]

In order to solve the above-mentioned problems, a sealed lead-acid battery according to the present invention has an electrode plate group housed in each cell chamber of a monoblock type battery case, and has different polarities of adjacent cells. A battery connected between terminals by an inter-cell connector penetrating a through hole provided in a cell chamber partition wall of the battery case, and a flat portion and an upper portion of the flat portion are provided at an upper portion of the cell chamber partition wall. > The protruding part protruding toward the
There provided in the projecting portion, and is fluid-tightly housed in the protrusion amount and the terminal and intercell connector covers the battery container within the recess of the back side of the lid. In addition, the front of the cell partition wall
A hat covering the protruding part and the periphery of the terminal and inter-cell connector
There is a G-shaped resin molded body, the hat-shaped resin molded body
The rib is provided with ribs around the entire circumference.
The upper end face of the partition is flush with the upper flat part of the partition wall.
A rib provided on the flat portion of the cut wall and the resin molded body;
Is heat-sealed to the lid.

The input / output terminal provided on the lid comprises a copper bolt and a copper alloy seat disposed below the bolt. It is embedded in a lead alloy bushing provided on the upper surface.

[0016]

[Action] In the battery of the present invention protrusion amount that protrudes upward from the flat portion and the flat portion is formed on the partition wall upper partitioning the cell chamber of the battery container, adjacent a through hole in the protrusion amount The different polarity terminals of the cells are connected by an inter-cell connector penetrating the through hole.

Since the protrusion is located on the back side of the lid, there is substantially no inter-cell connector in the battery case.

Therefore, the electrode plate having a height closer to the height of the battery case can be accommodated in the battery case, and the battery capacity can be increased, and the dead space in the battery case can be minimized to reduce the energy per unit volume. A sealed lead-acid battery having a high density can be provided.

Further, since the bolts constituting the input / output terminals are made of steel, the strength of the bolts can be increased as compared with the conventional copper alloy.

Further, when connecting the input / output terminal to the lead wire, an O-shaped ring-shaped washer provided at one end of the lead wire is provided at the lower portion of the bolt with a copper alloy seat having a small internal resistance. Since the battery is brought into contact with the upper surface, it is possible to take out a large current from the battery by reducing the electric resistance during energization.

[0021]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a side sectional view of a sealed lead-acid battery of the present invention. As shown in FIG. 1, an electrode group 15 in which a positive electrode plate 12 having an ear 11 on an upper part of an electrode plate and a negative electrode plate 13 are alternately arranged via a separator 14 mainly composed of fine glass fibers, It is housed in each cell chamber 3 of the monoblock type battery case 1 made of polypropylene resin.

In the electrode group 15, the ears of the same polarity electrode plate are connected to each other by a strap 5, and one end of the upper surface of the strap 5 is provided with a positive electrode terminal 6 or a negative electrode terminal 7.

A partition wall 2 for partitioning each cell chamber in the battery case.
As shown in FIG. 2, a projecting portion 16 projecting further upward is formed on the upper portion of the projecting portion.
The through hole 4 is provided in 6. Then, as shown in FIG. 3, the positive electrode terminal 6 and the negative electrode terminal 7 of the adjacent cell chambers are connected by the inter-cell connector 8 penetrating through the through hole 4.

Further, as shown in FIG. 4, the protruding portion 16 and the inter-cell connector 8 are connected to the protruding portion of the partition wall connecting the different polarity terminals of the adjacent cell chambers with the inter-cell connector. In addition, a hat-shaped polypropylene resin molded body 17 that covers the periphery of the negative electrode terminals 6 and 7 is formed.

As shown in FIG. 5, a rib 18 is provided on the brim portion of the hat-shaped polypropylene resin molded body, and the upper end surface of the rib 18 is formed on the upper end surface of the partition wall 2. The upper end surface of the partition wall 2 excluding the protruding portion and the rib 18 provided on the hat-shaped resin molded body are heat-welded to the lower end of the partition plate 10 of the lid. The molded body 17 is housed therein.

The hat-shaped polypropylene resin molded article is molded by a double injection method, and the protruding portions of the cell chamber partition wall connecting the different polarity terminals of the adjacent electrode plate groups with the inter-cell connecting body are formed by right and left. After being sandwiched between symmetrically divided molding dies, a polypropylene resin is poured into the molding die from above and solidified.

As can be seen from FIG. 1, the upper end face 19 of the partition wall 2 has a height substantially equal to the upper end of the battery case, and the heights of the positive and negative electrodes accommodated in the battery case are different from those of the partition wall. The height is obtained by subtracting the thickness of the strap 5 and the height of the electrode plate ears 11 from the height of the upper end.

On the other hand, in the conventional sealed lead-acid battery as shown in FIG. 6, the upper end face 19 of the cell chamber partition wall 2 of the battery case 1 has a height substantially equal to the upper end of the battery case. The through hole 4 is provided below the upper end surface 19 of the wall, and the positive terminal 6 and the negative terminal 7 of the adjacent cell are connected by the inter-cell connector 8 penetrating the through hole 4.

Accordingly, the heights of the positive and negative electrodes accommodated in the battery case are determined by the height of the positive electrode terminal 6 or the negative electrode terminal 7, the thickness of the strap 5 and the height of the electrode plate ear 11 from the height of the upper end of the partition wall. It will be the height minus the height.

For this reason, when battery cases of the same height are used, a larger electrode plate can be accommodated in the battery case in the battery of the present invention as compared with the conventional example, and batteries of the same size can be used. If so, the capacity can be further increased.

Next, the structure of the input / output terminal will be described with reference to FIG. As shown in FIG. 1, the input / output terminal 20 is composed of a steel bolt 21 and a copper alloy seat 22 disposed under the bolt. Buried in a bushing 23 made of
The periphery of 2 is filled with an adhesive 24.

The bushing 23 having the input / output terminal 20 is formed integrally with the lid 9, and the bushing 23 is connected to the pole 25 provided on the strap 5 above the electrode group.

Then, when connecting the battery to the device, O
In order to connect a lead wire having a mold ring-shaped washer at one end to the input / output terminal 20, the washer is fixedly contacted with the copper alloy seat 22.

In the input / output terminals, steel bolts are used instead of conventional copper bolts, so that the strength of the terminals can be improved, and one end of the lead wire is connected to the lead wire. Since it is brought into contact with a copper alloy seat having a small internal resistance, the electric resistance during energization can be reduced, and as a result, a large current can be taken out of the battery.

[0036]

As described above, in the sealed lead-acid battery according to the present invention, a projecting portion projecting further upward is formed on the upper part of the partition wall for partitioning the cell chamber of the battery case, and a through hole is provided in the projecting portion. Since the different polarity terminals of adjacent cells are connected by an inter-cell connector penetrating the through-hole and the protruding portion is located in the lid, the inter-cell connector substantially does not exist in the battery case. An electrode plate with a height closer to the height of the battery case can be housed in the battery case, increasing the battery capacity and minimizing dead space to create a sealed lead-acid battery with a large energy density per volume. Can be provided.

Further, since the input / output terminals are constituted by steel bolts and copper alloy seats, the strength of the bolts can be increased, and one end of the lead wire can be connected to the copper alloy seats. By connecting, the electric resistance at the time of energization can be reduced.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a sealed lead-acid battery of the present invention.

FIG. 2 is a view showing a cell room partition wall of the battery.

FIG. 3 is a diagram showing a state in which adjacent cells are connected at the upper part of a partition wall of the battery.

FIG. 4 is a view showing a state in which a resin molded body is formed on an upper part of a partition wall of the battery.

FIG. 5 is a top view of a resin molded body of the battery.

FIG. 6 is a perspective view showing a cell chamber partition wall of a conventional sealed lead-acid battery.

FIG. 7 is a diagram showing a state where adjacent cells are connected by a partition wall of the battery.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Battery case 2 Partition wall 3 Cell room 4 Through hole 5 Strap 6 Positive electrode terminal 7 Negative terminal 8 Intercellular connection body 9 Lid 10 Partition plate 11 Ear part 12 Positive electrode plate 13 Negative electrode plate 14 Separator 15 Electrode group 16 Protruding part 17 Resin Molded body 18 Rib 19 Upper end surface of partition wall 20 Input / output terminal 21 Bolt 22 Seat 23 Bushing 24 Adhesive 25 Polar pole

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-215244 (JP, A) JP-A-59-215660 (JP, A) JP-A-64-17378 (JP, A) 23415 (JP, U) JP-A 4-29163 (JP, U) JP-A 59-186961 (JP, U) JP-A 57-152768 (JP, U) (58) Fields surveyed (Int. Cl. ⁷ , DB name) H01M 2/24 H01M 10/12

Claims (2)

(57) [Claims] An electrode plate group is accommodated in each cell chamber of a monoblock type battery case, and between different polarity terminals of adjacent cells is inserted between through-holes formed in a cell chamber partition wall of the battery case. a battery connected by a connecting member, the protruding portions fraction in the cell chamber partition wall upper protruding upwardly from the flat portion and the flat portion
There is provided integrally, the through hole is provided in the protruding portion, the protruding portion and sealed with a liquid-tight manner accommodated terminals and the recess of the back side of the lid that intercell connector covers the battery container Lead storage battery. The wherein the upper cell partition walls, wherein there are projecting portion and the terminal and intercell connector hat type resin molded body that covers the periphery of the flange portion of the hat-shaped resin molded body total A rib is provided around the circumference, and the upper end surface of this rib is a partition wall
No upper flat portion in the same plane, the partition wall upper flat portion <br/> and the sealed lead-acid battery of claim 1, wherein the rib provided on the resin molded body was heat-welded to the lid.