JPH09312155A - Sealed lead-acid battery and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the volume energy density by fitting a unified strap, which connects adjacent cells to each other, in a through groove provided in a partitioning wall with the adhesive agent. SOLUTION: A battery jar 1 made of polypropylene is provided with plural unified cell chambers 3, which are partitioned by partitioning walls 2. Straps 7a, 7b having a different polarity from each other and to be connected in series between the adjacent cell chamber 3 are integrally formed with each other by a cast-on strap method of lead so as to form a unified strap 7. At this stage, periphery of the strap at an intermediate part thereof is coated with chlorinated polypropylene 10. The coated part is heated, and in the condition that the hardening temperature is maintained, a plate group 5 is inserted into each corresponding cell chamber 3. At this stage, when the part coated with polypropylene 10, which is in the heating condition, is fitted in the through groove 11 of the partitioning wall 2, the through groove 11 is melted by the heat, and the partitioning wall 2 made of polypropylene and the strap 7 made of lead are unified with each other. At the time of sealing the battery jar 1 with an upper lid 9, inside measure height of the battery jar can be effectively utilized.

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 used as a power source for industrial equipment, portable equipment and the like, and a method for manufacturing the same.

[0002]

2. Description of the Related Art FIG. 4 is a perspective view showing an assembling process of a conventional sealed lead acid battery. In this sealed lead-acid battery, the inside of the battery case 1 is partitioned by partition walls 2 to form three cell chambers 3 in this example. Through holes 4 are alternately provided on the upper portions of the partition walls 2.

In each of these cell chambers 3, an electrode plate group 5 is provided.
Are to be accommodated. The electrode plate group 5 has a structure in which an anode plate and a cathode plate are superposed on each other with an electrolytic solution holding body interposed therebetween, and the ear portion 6 of one of the polar plates having the same polarity is used.
a is connected by a strap 7a, and the ear portion 6b of the other polar plate having the same polarity is connected by a strap 7b. On the straps 7a and 7b of the electrode plate group 5 connected in series, inter-cell connection bodies 8a and 8b are provided upright. These inter-cell connections 8
The a and 8b are arranged opposite to each other with the partition wall 2 interposed therebetween at the position of the through hole 4 and are welded through through the through hole 4. Battery case 1
After accommodating the electrode plate group 5, the upper cover 9 is covered and welded.

[0004]

In such a conventional sealed lead-acid battery, there is a space that is not necessary as an energy source of the battery although it is necessary for the work of connecting cells. Due to this space, the volumetric energy density of the assembled battery is lower than that calculated from the originally required space. In addition, since welding is performed twice when the cells are assembled and when the cells are connected to each other, there is a problem in that the cost of the battery is increased and a failure occurs.

An object of the present invention is to provide a sealed lead acid battery which can improve the volume energy density.

Another object of the present invention is to provide a method of manufacturing a sealed lead acid battery which has a polypropylene battery cell and can improve the volumetric energy density.

[0007]

According to the present invention, a plurality of cell chambers are formed by partitioning the inside of a battery case with partition walls, and each cell chamber contains a group of electrode plates, and these electrode plate groups have the same polarity. The sealed lead-acid battery has a structure in which the ears of the electrode plates are connected by straps, the straps that should be connected to each other between adjacent cell chambers are connected to each other, and the upper part of the battery case is closed by the upper lid. To do.

In the sealed lead-acid battery according to the first aspect, the straps to be connected to each other between the adjacent cell chambers are integrally formed as an integrally formed strap, and the integrally formed strap is formed in the through groove of the partition wall. It is characterized in that it is fitted and adhered with an adhesive.

When the straps to be connected to each other between the adjacent cell chambers are integrally formed as integrally formed straps and the integrated straps are fitted into the through grooves of the partition wall, the height of the electrode plate group is reduced. Since the upper limit of the height in the battery case can be used, the volumetric energy density of the battery can be improved. Also, since the straps that should be connected to each other in the adjacent cell chambers are formed as integrated straps that are integrated with each other from the beginning, the internal resistance can be reduced and high output can be achieved. The reliability can be improved by reducing the number of dangerous points. In addition, the sealing of the penetrating portion of the integrally formed strap in the penetrating groove of the partition wall can be easily performed with an adhesive.

The sealed lead-acid battery according to the second aspect is characterized in that the wall surface of the partition wall forming the through groove is a concave surface.

When the wall surface of the partition wall forming the through groove is a concave surface in this way, in the case of a certain adhesive, the adhesive applied around the integrally formed strap is heated and cured to form the through groove of the partition wall. At the time of bonding to, the edge portion in the thickness direction of the partition wall depressed by the concave surface is melted by the heat of the adhesive side in a heated state,
The partition wall and the integrally formed strap can be easily bonded to each other via an adhesive. Further, in the case of this adhesive, even if the adhesive-applied portion of the integrally formed strap has a slight dimensional difference from other portions, this dimensional difference can be absorbed by the concave portion. In the case of another adhesive, the partition and the integrally formed strap can be easily bonded to each other in a state where the adhesive is held on the thick concave surface of the partition forming the through groove.

Further, according to the present invention, the inside of a polypropylene battery case is partitioned by partition walls to form a plurality of cell chambers, and each cell chamber contains an electrode plate group, and these electrode plate groups have the same polarity. The ears of the electrode plates are connected with lead straps, the straps that should be connected to each other between adjacent cell chambers are connected to each other, and the upper part of the battery case is closed with a polypropylene top lid. It is intended to improve a manufacturing method of a storage battery.

In the method for manufacturing the sealed lead-acid battery according to the third aspect, the straps to be connected to each other between adjacent cell chambers are integrally formed as an integrally formed strap, and the partition wall of the integrally formed strap penetrates. When chlorinated polypropylene is applied as an adhesive around the part to be fitted in the groove, at least the chlorinated polypropylene applied part of the integrally formed strap is heated and cured, and when each electrode plate group is inserted into the corresponding cell chamber It is characterized in that a heated chlorinated polypropylene application portion of the integrally formed strap is fitted into a through groove of the partition wall and the integrally formed strap is bonded to the partition wall via the chlorinated polypropylene application portion.

When the straps to be connected to each other between the adjacent cell chambers are integrally formed as the integrally formed straps as described above, the welding only needs to be performed once, the manufacturing efficiency can be improved, and the cost can be reduced. You can

Further, when the straps to be connected to each other between the adjacent cell chambers are integrally formed as an integrally formed strap and the integrated strap is fitted into the through groove of the partition wall, the height of the electrode plate group can be reduced. Since the upper limit of the height in the tank can be used, the volumetric energy density of the battery can be improved.

Before fitting the integrally formed strap in the through groove of the partition wall, chlorinated polypropylene is applied as an adhesive around the portion of the integrally formed strap fitted in the through groove of the partition wall, and at least the integrally formed strap is formed. Heat the chlorinated polypropylene coating part of the item to harden it, and insert the heated chlorinated polypropylene coating part of the integrally formed strap into the through groove of the partition wall when inserting each electrode plate group into the corresponding cell chamber. When it is inserted, a part of the polypropylene partition wall is melted by the heat, and the lead integrally formed strap can be easily bonded even to the polypropylene partition wall which is difficult to bond to lead.

In this case, the integrally formed strap may be fitted into the through groove of the partition wall in a state where the heat during the heat curing of the chlorinated polypropylene application portion is not cooled, or even after the heat during the heat curing is cooled. The chlorinated polypropylene application portion may be reheated to fit the integrally formed strap into the through groove of the partition wall. In the former case, since reheating is not necessary, the sealed lead acid battery can be manufactured efficiently.

The method for manufacturing a sealed lead-acid battery according to claim 4 is characterized in that the thick wall surface of the partition wall forming the through groove is a concave surface.

When the wall surface of the partition wall forming the through groove is a concave surface, in the case of an adhesive made of chlorinated polypropylene, the chlorinated polypropylene is first applied to the integrally formed strap and cured. Since it fits into the through groove of the partition wall, even if the chlorinated polypropylene application part of the integrally formed strap has a slight dimensional difference from the other part, this dimensional difference can be absorbed by the concave part. it can. In addition, when the adhesive is heated and cured, the edge portion in the thickness direction of the partition wall recessed by the concave surface is heated and melted by the heat of the adhesive side, and the partition wall and the integrally formed strap are easily bonded. It can be bonded via an agent.

[0020]

1 shows an example of an embodiment of a sealed lead-acid battery according to the present invention. The parts corresponding to those of the above-mentioned conventional example shown in FIG. 4 are designated by the same reference numerals.

The structure of the sealed lead-acid battery of this example will be described together with its manufacturing method. In this example, straps 7a, 7b of different polarities that should be connected in series between the adjacent cell chambers 2 are used.
Is formed of lead by the caston strap method as the integrally formed strap 7 integrated with each other from the beginning. Both the strap 7a and the strap 7b, which are both ends in series connection, are formed of lead by the caston strap method.

Around the middle portion of the integrally formed strap 7, a chlorinated polypropylene 10 which is an adhesive agent of lead forming the integrally formed strap 7 and polypropylene which is the plastic forming the partition wall 2 is applied. .

At least the chlorinated polypropylene-coated portion of the integrally formed strap 7 is heated and cured, and the electrode plates 5 connected to each other are inserted into the corresponding cell chambers 3 while maintaining the curing temperature. At this time, the coated portion of the chlorinated polypropylene 10 in the heated state of the integrally formed strap 7 is fitted into the through groove 11 of the partition wall 2. Then, the partition wall 2 made of polypropylene is partially melted by the heat of the chlorinated polypropylene 10 in a heated state, and even the partition wall 2 made of polypropylene which is difficult to adhere to lead is integrally formed with the strap 7 made of lead.
Can be easily bonded.

Thereafter, the lower surface of the polypropylene upper lid 9 is heated, and the upper surface of the polypropylene battery case 1 is also heated to cover and weld the battery container 1 with the upper cover 9. In this case, since the polypropylenes are welded to each other, the welding can be easily performed.

In the sealed lead-acid battery having such a structure, the height of the electrode plate group 5 can be used up to the upper limit of the height in the battery case 1, so that the volume energy density of the battery can be improved. Further, since the different polarity straps 7a and 7b to be connected in series between the adjacent cell chambers 2 are formed as the integrally formed straps 7 which are integrated with each other from the beginning, the internal resistance can be reduced and the output can be increased. Further, the cost can be reduced by reducing the number of parts, and the reliability can be improved by reducing the risk of failure.

2 and 3, the through groove 1 provided in the partition wall 2 is shown.
2 shows another example of No. 1. In this example, the through groove 11
The V-shaped concave surface 12 is formed on the thick surface of the partition wall 2 forming the.

When the V-shaped concave surface 12 is formed on the thick surface of the partition wall 2 in which the through groove 11 is formed in this manner, the portion of the integrally formed strap 7 to which the chlorinated polypropylene 10 is applied is slightly dimensioned with respect to other portions. Even if there is a difference, this dimensional difference can be absorbed by the concave surface 12.

When the chlorinated polypropylene 10 applied around the integrally formed strap 7 is heat-cured and adhered to the inside of the through groove 11 of the partition wall 2, the partition wall 2 is recessed by the concave surface 12 in the thickness direction. The edge portion 2a is melted by the heat of the chlorinated polypropylene 10 side in the heated state, and the partition wall 2 and the integrally formed strap 7 can be easily bonded via the chlorinated polypropylene 10.

Next, in order to confirm the reliability of the battery, FIG.
The battery of the present invention having the structure shown in Fig. 4 and the conventional battery having the structure shown in Fig. 4 were prepared for 20 batteries each, and the capacity was confirmed and the self-discharge performance was confirmed.

In the above example, the battery case 1 and the lid 9 are made of polypropylene, but other resins such as acrylonitrile.
It can also be formed of butadiene-styrene resin (ABS resin) or the like. In this case, an adhesive such as an epoxy resin does not need to be attached to the integrally formed strap 7 and cured, and is applied to the concave surface 12 provided on the thick surface of the partition wall 2 forming the through groove 11 and then integrally formed. The strap 7 may be inserted and adhered.

In the above example, the different polarity straps 7a and 7b to be connected in series between the adjacent cell chambers 3 are integrally formed as the integrally formed straps 7, but the adjacent cell chambers 3 should be connected in parallel. The polar straps 7a, 7a or 7b, 7b can also be integrally formed with each other as an integrally formed strap 7.

[0032]

In the sealed lead-acid battery according to the first aspect of the present invention, the straps that should be connected to each other between adjacent cell chambers are integrally formed as an integrally formed strap, and the integrally formed strap is formed through the through groove of the partition wall. Since it is fitted into
The height of the electrode plate group can be used up to the upper limit of the height in the battery case, and the volume energy density of the battery can be improved. In addition, since the straps that should be connected to each other between adjacent cell chambers are formed as an integrally formed strap from the beginning, the internal resistance can be reduced and the output can be increased, and the cost can be reduced by reducing the number of parts. Lowering the
In addition, reliability can be improved by reducing the risk of failure. In addition, the sealing of the penetrating portion of the integrally formed strap in the penetrating groove of the partition wall can be easily performed with an adhesive.

In the sealed lead-acid battery according to the second aspect of the present invention, since the wall surface of the partition wall forming the through groove is a concave surface, in the case of a certain adhesive, the adhesive applied around the integrally formed strap is used. The edge portion in the thickness direction of the partition wall, which is recessed by the concave surface when the partition wall is cured by heating and adheres to the inside of the through groove, is melted by the heat of the adhesive side in a heated state, so that the partition wall and the integrated strap can be easily formed. Can be bonded via an adhesive. Further, in the case of this adhesive, even if the adhesive-applied portion of the integrally formed strap has a slight dimensional difference from other portions, this dimensional difference can be absorbed by the concave portion. In the case of another adhesive, the partition and the integrally formed strap can be easily bonded to each other in a state where the adhesive is held on the thick concave surface of the partition forming the through groove.

In the method for manufacturing the sealed lead-acid battery according to the third aspect, since the straps to be connected to each other between the adjacent cell chambers are integrally formed as the integrally formed strap, the welding may be performed only once. The manufacturing efficiency can be improved and the cost can be reduced.

Further, since the straps to be connected to each other between the adjacent cell chambers are integrally formed as integrally formed straps and the integrally formed straps are fitted into the through grooves of the partition walls, the height of the electrode plate group can be reduced. It is possible to use up to the upper limit of the height in the tank and improve the volume energy density of the battery.

Before fitting the integrally formed strap in the through groove of the partition wall, chlorinated polypropylene is applied as an adhesive around the portion of the integrally formed strap fitted in the through groove of the partition wall, and at least the integrally formed strap is formed. Heat the chlorinated polypropylene coating part of the item to harden it, and insert the heated chlorinated polypropylene coating part of the integrally formed strap into the through groove of the partition wall when inserting each electrode plate group into the corresponding cell chamber. Since the heat is applied, a part of the partition wall made of polypropylene is melted, so that the integrally formed strap made of lead can be easily bonded even if the partition wall made of polypropylene is difficult to bond to lead.

In the method of manufacturing the sealed lead-acid battery according to the fourth aspect, since the thick wall surface of the partition wall forming the through groove is a concave surface, in the case of an adhesive made of chlorinated polypropylene, the chlorination is performed. Polypropylene is first applied to the integrally formed strap and cured, and then fitted into the through groove of the partition wall.At this time, there is a slight dimensional difference between the chlorinated polypropylene coated portion of the integrally formed strap and other portions. However, this dimensional difference can be absorbed by the concave portion. In addition, when the adhesive is heated and cured, the edge portion in the thickness direction of the partition wall recessed by the concave surface is heated and melted by the heat of the adhesive side, and the partition wall and the integrally formed strap are easily bonded. It can be bonded via an agent.

[Brief description of drawings]

FIG. 1 is a perspective view before assembly showing an example of an embodiment of a sealed lead-acid battery according to the present invention.

FIG. 2 is a perspective view showing another example of a through groove provided in the upper part of the partition wall in this example.

FIG. 3 is a vertical cross-sectional view showing a state where an integrally formed strap is attached to a portion of a through groove of FIG.

FIG. 4 is a perspective view of a conventional sealed lead-acid battery before assembly.

[Explanation of symbols]

 1 Battery Case 2 Partition 3 Cell Chamber 4 Through Hole 5 Electrode Plate Group 6a, 6b Ear 7 Integrated Strap 7a, 7b Strap 8a, 8b Cell-to-cell Connection Body 9 Top Lid 10 Chlorinated Polypropylene (Adhesive) 11 Through Groove 12 Concave Surface

Claims (4)

[Claims] 1. A plurality of cell chambers are formed by partitioning the inside of a battery case with partition walls, and a group of electrode plates is housed in each of the cell chambers. In a sealed lead-acid battery, each of which is connected by a strap, and the straps that should be connected to each other between adjacent cell chambers are connected to each other, and the upper part of the battery case is closed by an upper lid, The sealed lead acid battery according to claim 1, wherein the straps to be connected are integrally formed with each other as an integrally formed strap, and the integrally formed strap is fitted into a through groove of the partition wall and adhered with an adhesive. 2. The sealed lead acid battery according to claim 1, wherein a thick surface of the partition wall forming the through groove is a concave surface. 3. A polypropylene battery case is partitioned by partition walls to form a plurality of cell chambers, and each of the cell chambers contains an electrode plate group, and these electrode plate groups are of the same polarity. The ears are connected by lead straps, and the straps that should be connected to each other between adjacent cell chambers are connected to each other, and the upper part of the battery case is closed by a polypropylene top lid. In the manufacturing method, straps that should be connected to each other between adjacent cell chambers are integrally formed as integrally formed straps, and chlorinated polypropylene is used as an adhesive around the portion of the integrally formed straps fitted into the through groove of the partition wall. Then, at least the chlorinated polypropylene application portion of the integrally formed strap is heated and cured, and each electrode plate group is inserted into the corresponding cell chamber. At this time, the application portion of the chlorinated polypropylene in the heated state of the integrally formed strap is fitted into the through groove of the partition wall, and the integrally formed strap is bonded to the partition wall through the application portion of the chlorinated polypropylene. A method for manufacturing a sealed lead-acid battery, comprising: 4. The method for manufacturing a sealed lead-acid battery according to claim 3, wherein a thick surface of the partition wall forming the through groove is a concave surface.