JPH10144280A - Sealed lead-acid battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealed lead-acid battery of which cost can be reduced even in the case of providing a safety valve. SOLUTION: The inside of a battery jar 1 is partitioned by bulkheads 2 so as to be formed into a plurality of battery jar chambers 3. Each recessed part 6 is provided for a battery jar inner lid 4 at a position where each bulkhead 2 exists, in response to the respective battery jar chambers 3 adjacent to the bulkheads 2. Valve holes 7 are opened at the bottom part of each recessed part 6 respectively so as to be communicated with the respective battery jar chambers adjacent to each bulkhead 2. A common valve cylinder 8 is erected from the bottom part in the inside of the each recessed part 6 while these valve holes 7 are enclosed. A partitioning wall 12 partitioning the inside of the valve cylinder 8 is provided for the inside of the valve cylinder 8 while being extended from each bulkhead 2. Bursting nicks 13 are provided for the tip end parts of the valve cylinder 8 respectively in response to the respective valve holes 7. The tip end part of the valve cylinder 8 is covered with a cap-shaped valve element 9 in order to shield the respective bursting nicks 13. A battery jar upper closure 10 is fixed to the entrance of each recessed part 6 for the battery jar inner lid 4 in a state that the valve element 9 together with the valve cylinder 8 are held together.

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 having a plurality of battery chambers.

[0002]

2. Description of the Related Art FIGS.
And a plurality of battery case chambers 3 are provided.
1 shows a structure of a conventional sealed lead-acid battery in which an electrode group (not shown) is accommodated.

[0003] In such a sealed lead-acid battery, a safety valve 5 is provided in a battery case inner lid 4 for each battery case room 3. The safety valve 5 is provided with a recess 6 in the inner cover 4 of the battery case, and a valve sleeve 8 is provided upright so as to surround a valve hole 7 at the bottom of the recess 6.
A rubber-made cap-shaped valve element 9 is placed on the tip of the container so as to be in close contact therewith, and a battery case upper cover 10 is fitted to the inlet of the recess 6 in the battery case inner cover 4 and fixed by ultrasonic welding or the like. ing. Reference numerals 11a and 11b denote positive and negative terminals of the sealed lead-acid battery.

[0004]

However, in the sealed lead-acid battery having such a structure, it is necessary to provide the safety valve 5 in the battery case inner cover 4 by the number of battery case chambers 3, and the number of parts and the number of assembling steps increase. However, there was a problem that the cost increased.

In the structure of the conventional safety valve 5, when the internal pressure of the battery case chamber 3 rises, the cap-shaped valve body 9 is connected to the battery case top cover 1.
0 is pushed up until it hits 0, and gas is discharged from between the inner surface of the valve body 9 and the outer wall of the valve cylinder 8. When the ultrasonic welding of the battery case upper cover 10, the valve body 9 and the battery case upper cover 10 If it is pushed deeply, the tip of the valve cylinder 8 and the battery case
The valve body 9 is interposed between the valve and the valve, and it becomes difficult to discharge the gas, the operating pressure of the safety valve 5 increases, and the battery swells.

In order to reduce the number of safety valves 5,
It is conceivable that a plurality of battery case chambers 3 are connected by a pipe for discharging gas and only one safety valve 5 is attached. However, the cathode plate in each battery case room 3 is formed by oxygen generated in the battery case room 3. In addition to absorbing gas, there is a possibility that oxygen gas in another battery case room 3 may be absorbed. The sealed lead-acid battery suppresses a decrease in electrolyte and an increase in specific gravity by absorbing generated oxygen gas at the cathode. For this reason, when oxygen gas in the other battery case chamber 3 is absorbed, the specific gravity of the electrolytic solution is reduced in the absorbed battery case room 3, and conversely, in the battery case room 3 where the oxygen gas cannot be absorbed completely, And the specific gravity increases, causing a problem that the state of each battery case chamber 3 varies.

An object of the present invention is to provide a sealed lead-acid battery that can reduce the cost even if a safety valve is provided.

It is another object of the present invention to provide a sealed lead-acid battery that can prevent gas from flowing between battery compartments even if a safety valve is provided in common between adjacent battery compartments.

Another object of the present invention is to provide a sealed lead-acid battery which can reduce the number of safety valves.

Another object of the present invention is to provide a sealed lead-acid battery capable of discharging gas without any trouble even when the valve element is sandwiched between the tip of the valve cylinder and the battery case upper lid.

[0011]

According to the present invention, there is provided an improved sealed lead-acid battery in which a plurality of battery case chambers are formed by partitioning the inside of a battery case by partition walls, and each of the battery case chambers accommodates an electrode group. Is what you do.

In the present invention, a concave portion is provided in the inner lid of the battery case at a position where the partition wall exists, corresponding to each battery case room adjacent to the partition wall. Valve holes are respectively opened at the bottoms of the concave portions so as to communicate with the battery case chambers adjacent to the partition walls. A common valve cylinder is erected from the bottom in the recess so as to surround these valve holes. A partition wall that extends from the partition wall and partitions the inside of the valve cylinder is provided in the valve cylinder. A pressure relief notch is provided at the tip of the valve cylinder corresponding to each valve hole. A cap-shaped valve body is placed on the distal end of the valve cylinder so as to cover each pressure relief cut. At the entrance of the concave portion of the battery case inner lid, the battery case upper lid is fixed together with the valve body with the valve body interposed therebetween.

When the safety valve is provided as described above, the safety valve is provided commonly to at least two battery case chambers, so that the cost can be reduced.

[0014] Even if the safety valve is provided in common between the adjacent battery chambers, the partition wall is provided in the valve cylinder, so that gas does not flow between the battery chambers. For this reason, the specific gravity of the electrolyte decreases in the battery chamber that has absorbed oxygen gas in the other battery chambers, and conversely, in the battery chamber that has not absorbed oxygen gas, the amount of electrolyte decreases and the specific gravity increases. Can be prevented.

In this safety valve, even if the valve body is sandwiched between the tip of the valve cylinder and the battery case upper lid, the pressure relief cut-off portions are provided at the tip of the valve cylinder corresponding to the respective valve holes. When the internal pressure in the tank chamber increases, the pressure can be released without any trouble by using these pressure relief cuts.

In this case, the safety valve is provided so as to straddle two adjacent battery case chambers, or is provided on different partition walls of each battery case room so that at least two are present in one battery case room. It can be provided across four battery chambers at the intersection of the partition walls.

In particular, if the structure has two safety valves in one battery case chamber, the number of safety valves and the man-hour for manufacturing the safety valve are the same in the whole battery, but two safety valves are provided in one battery case room. In this case, even if the valve of one safety valve sticks to the valve cylinder and the safety valve cannot be operated, the other safety valve can be operated, preventing battery swelling and improving battery reliability. Can be done.

[0018]

1A, 1B, and 1C show a first embodiment of a sealed lead-acid battery according to the present invention.

In the sealed lead-acid battery of this embodiment, the battery case 1
The inside is partitioned by a partition wall 2 to form a plurality of battery case chambers 3, and each battery case room 3 accommodates an electrode plate group (not shown).

At the position where the partition wall 2 is located,
A recess 6 is provided corresponding to each battery case chamber 3 adjacent to the partition 2. A valve hole 7 is opened at the bottom of the concave portion 6 so as to communicate with each battery case chamber 3 adjacent to the partition wall 2. A common valve cylinder 8 surrounding the valve holes 7 is integrally formed upright from the bottom in the recess 6. A partition wall 12 that extends from the partition wall 2 and partitions the inside of the valve cylinder 8 is integrally formed in the valve cylinder 8. A pressure relief notch 13 is provided at the distal end of the valve cylinder 8 corresponding to each valve hole 7. A cap-shaped valve body 9 made of rubber is covered on the distal end portion of the valve cylinder 8 so as to cover the pressure relief cuts 13. At the entrance of the concave portion 6 of the battery case inner cover 4, the battery case upper cover 10 is fixed together with the tip of the valve cylinder 8 with the valve body 9 interposed therebetween.

When the safety valve 5 is provided so as to correspond to the battery case chambers 3 on both sides of the partition 2, the safety valve 5 has a structure common to the two battery case rooms 3, so that the cost can be reduced. Thus, even if the safety valve 5 is provided in common between the adjacent battery case chambers 3, since the partition wall 12 is provided in the valve case 8, it is possible to prevent gas from flowing between the battery case rooms 3. . For this reason, the specific gravity of the electrolytic solution is reduced in the battery case room 3 in which the oxygen gas has been absorbed in the other battery case room 3, and the amount of the electrolytic solution is reduced in the battery case room 3 in which the oxygen gas cannot be completely absorbed. Can be prevented from rising.

In this safety valve 5, even if the valve element 9 is sandwiched between the distal end of the valve cylinder 8 and the battery case upper lid 10, the pressure relief notch 13 is formed at the distal end of the valve cylinder 8 in correspondence with each valve hole 7. Since each of them is provided, when the internal pressure in the battery case chamber 3 rises, the pressure can be released without any trouble by using the pressure release cut-out portions 13.

FIG. 2 shows a second embodiment of the sealed lead-acid battery according to the present invention.

In the sealed lead-acid battery of this embodiment, the safety valves 5 are provided on different partition walls 2 of each battery case chamber 3 so that at least two safety valves 5 exist in one battery case room 3. The structure of each safety valve 5 is the same as in the first example.

As described above, if one battery case chamber 3 has a structure having two safety valves 5, the safety valve 5 is required for the whole battery.
The number of steps and the man-hour for producing the safety valve 5 are the same. However, if two safety valves 5 are provided in one battery case chamber 3, the valve element 9 of one safety valve 5 sticks to the valve cylinder 8 and Even if the safety valve 5 cannot be operated, the other safety valves 5 can be operated, so that the battery can be prevented from swelling and the reliability of the battery can be improved.

FIGS. 3A and 3B show a third embodiment of the sealed lead-acid battery according to the present invention.

In the sealed lead-acid battery of this embodiment, the safety valve 5 is provided across the four battery case chambers 3 at the intersection 2a of the partition wall 2. In this case, although not shown, partition walls 12 are provided in the valve cylinder 8 in an intersecting manner corresponding to the intersections 2a of the partition walls 2, and the four valve holes 7 partitioned by these partition walls 12 are provided.
The pressure relief notch 13 is provided at the tip of the valve cylinder 8 in correspondence with the above.

As described above, the safety valve 5 is provided at the intersection 2a of the partition wall 2.
Is provided, the number of safety valves 5 of the battery case 1 can be further reduced.

The third example can be combined with the first example.

[0030]

In the sealed lead-acid battery according to the present invention, a concave portion is provided in the inner cover of the battery case at a position where the partition wall exists, corresponding to each of the battery case chambers adjacent to the partition wall. The valve holes are respectively opened by communicating with the adjacent battery case chambers, and a common valve cylinder surrounding these valve holes is erected from the bottom in the concave portion, and the valve cylinder is extended from the partition wall in the valve cylinder. A partition wall for partitioning the inside, a pressure relief notch is provided at the tip of the valve cylinder corresponding to each valve hole, and a cap-shaped valve body covering each pressure relief notch at the tip of the valve cylinder And the safety valve is formed by fixing the battery case upper lid at the entrance of the concave portion of the battery case middle cover together with the valve body with the valve body interposed therebetween, so that the safety valve is provided in at least two battery case chambers. Since they are provided in common, cost can be reduced.

As described above, even if the safety valve is provided in common between the adjacent battery case chambers, since the partition wall is provided in the valve cylinder, gas does not flow between the battery case chambers. The specific gravity of the electrolyte is reduced in the battery chamber that absorbs oxygen gas in the chamber, and the specific gravity of the electrolyte is prevented from increasing in the battery chamber that cannot absorb oxygen gas. be able to.

Further, in this safety valve, even if the valve element is sandwiched between the tip of the valve cylinder and the battery case upper cover, the pressure relief cut-off portions are provided at the tip of the valve cylinder so as to correspond to the respective valve holes. When the internal pressure in the battery case chamber rises, the pressure can be released without any trouble by using these pressure relief cuts.

[Brief description of the drawings]

1A is a plan view showing a first example of an embodiment of a sealed lead-acid battery according to the present invention, FIG. 1B is a cross-sectional view taken along line AA of FIG. 1A, and FIG. It is a perspective view of the valve cylinder of the 1st example.

FIG. 2 is a plan view showing a second example of the embodiment of the sealed lead-acid battery according to the present invention.

FIG. 3A is a plan view showing a third example of the embodiment of the sealed lead-acid battery according to the present invention, and FIG.
It is a perspective view of the valve cylinder of an example.

FIG. 4A is a plan view of a conventional sealed lead-acid battery,
(B) is a sectional view taken along line BB of (A).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Battery case 2 Partition wall 3 Battery case room 4 Battery case inner lid 5 Safety valve 6 Concave part 7 Valve hole 8 Valve cylinder 9 Valve body 10 Battery case upper lid 11a, 11b Positive and negative terminal parts 12 Partition wall 13 Discharge cut-off part

Claims (4)

[Claims] 1. A sealed lead-acid battery in which a plurality of battery case chambers are formed by partitioning the inside of a battery case with partition walls, and a group of electrode plates is accommodated in each battery case room. A concave portion is provided in the inner lid of the tank so as to correspond to each of the battery chambers adjacent to the partition, and valve holes are respectively opened at the bottom of the concave portion so as to communicate with the battery chambers adjacent to the partition. A common valve cylinder surrounding the hole is erected from the bottom in the concave portion, and a partition wall extending from the partition wall and partitioning the valve cylinder is provided in the valve cylinder, and corresponds to each of the valve holes. A pressure relief notch is provided at the distal end of the valve cylinder, and a cap-shaped valve body is covered at the distal end of the valve cylinder so as to cover each of the pressure relief notches. The battery case upper lid is fixed to the entrance of the concave portion with the valve body sandwiched together with the tip of the valve cylinder. Sealed lead-acid battery to be. 2. The sealed lead-acid battery according to claim 1, wherein the safety valve is provided so as to straddle two adjacent battery case chambers. 3. The sealed lead-acid battery according to claim 1, wherein the safety valves are provided on different partition walls of each of the battery case chambers so that at least two safety valves are provided in one of the battery case chambers. 4. The sealed lead-acid battery according to claim 1, wherein the safety valve is provided across the four battery case chambers at the intersection of the partition walls.