JP3328475B2 - Storage battery case - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a battery case of a storage battery.

[0002]

2. Description of the Related Art In a storage battery, a group of electrode plates is housed in a box-shaped battery case, and an opening of the battery case is sealed by a lid. A general battery case of a conventional storage battery has a single linear welded edge on the upper edge of the battery case, and a lid covering the upper part of the battery case and the linear welded portion are opposed to each other. The lid and the battery case were hermetically fixed by heat welding. Further, the bottom surface inside the conventional battery case has a structure in which the entire surface is flat or a plurality of thin ribs orthogonal to the electrode plate are provided on the bottom surface.

[0003]

In a conventional battery case of a storage battery, a predetermined group pressure is applied to an electrode plate group including a large number of anode plates, cathode plates and separators so as to ensure predetermined battery characteristics. Did not provide the required strength of the short side wall. Here, the short side is parallel to each electrode plate.
Te, is that the surface facing the outermost electrode plate of the electrode plate group. Even if the strength of the short side wall member is increased by increasing the thickness of the short side wall member of the battery case, the strength of the welded portion where the battery case and the lid are thermally welded is low according to the conventional structure. In other words, if only one welding edge was used, a bending moment was applied, and a crack was formed on the side of the welded portion on the side where the welding was performed, and the welded portion was likely to come off. Therefore, sufficient short side strength was not obtained, for example, the welded portion might break even at the predetermined group pressure.

[0004] Further, since the battery case houses the electrode group, when the storage battery is used for a long period of time, the active material and the corrosive substance of the grid gradually fall from the side surface of the electrode group to the bottom of the container.
Such falling precipitates have a risk of causing a short circuit between the anode plate and the cathode plate. Conventionally, in order to prevent a short circuit due to the falling precipitate, a structure in which the entire electrode plate group is floated by a rib provided on the bottom surface has been adopted. However, since the electrode group is supported by the thin ribs, there is a danger that the ribs may cut into the electrode group and damage the electrode plate, causing a trouble such as a short circuit. In some cases, the entire electrode group is supported by a flat bottom of the battery case.In this case, the edges at both ends of the bottom of the electrode plate sometimes pierce the bottom and side corners of the battery case, or the edges are separated by a separator. There is a problem that it may cause a short circuit between the electrode plates by damaging the electrode plate. Thus, the conventional battery case does not have sufficient short side wall strength, there is a danger of short-circuit due to sediment falling in the container,
When the ribs are provided on the bottom surface, there is a problem to be solved, such as that the electrode plate group is damaged and a trouble such as a short circuit is likely to occur, and the edges at both ends of the bottom of the electrode plate are liable to damage the separator to cause a short circuit.

The present invention has been made to solve these problems, and the short side wall of the battery case has a desired strength, and the strength of the heat welding portion between the battery case and the lid is large. It is intended to provide a tank. It is another object of the present invention to provide a battery case in which the danger of a short circuit due to the sediment falling into the tank is prevented by a groove in a peripheral portion of the bottom surface. It is another object of the present invention to provide a battery case in which the entire electrode group is stably supported on the bottom surface and the lower part of the electrode group is not damaged. It is still another object of the present invention to provide a battery case in which the bottom of the battery case is smoothed so that the edge of the bottom of the electrode plate does not damage the separator.

[0006]

According to a first aspect of the present invention, there is provided a battery case for a storage battery, wherein a group of electrode plates is housed in each cell room divided by a cell room partition wall of a monoblock type battery case, and adjacent cells are arranged. In a storage battery in which different polarity terminals of a group of electrode plates of a chamber are connected by an inter-cell connector penetrating the cell chamber partition wall, a short side surface of a battery case to which an outermost electrode plate of the group of electrode plates housed in the battery case contacts. arranging a plurality of longitudinal ribs parallel to the vertical direction of the storage battery to the outer wall of the member constituting the, arranged transverse ribs for connecting the longitudinal ribs in the horizontal direction at the upper end of the longitudinal ribs, wherein
A plurality of fuses parallel to the upper edge of the member
An outer one of the plurality of welding edges
However, it partially protrudes from the upper surface of the lateral rib . In the battery case of the storage battery according to the second aspect of the present invention, the entire width of the plurality of parallel welding edges in a direction perpendicular to the longitudinal direction is larger than the thickness of a member constituting the short side surface of the battery case. Claim 3
The battery case of the storage battery according to the invention, the two long side surfaces orthogonal to the short side surface of the battery case facing the outermost electrode plate of the electrode housed in the battery case of the storage battery, and near the intersection of the inner bottom surface of the battery case, Forming a groove in a portion along the both long side surfaces of the bottom surface,
The electrode group is configured to be held by the flat bottom surface between the two grooves.

In the battery case of the present invention having this configuration, a plurality of welding edges are provided on the upper edge of the battery case and are fixed by welding at a wide welding portion, so that the welding strength of the welding portion increases, The strength of the short side of the battery case becomes even stronger. Therefore, the inward pressure (atmospheric pressure) such as the group pressure of the electrode group housed in the battery case, the outward pressure due to the internal pressure of the gas generated during charging, or the pressure reduction due to the gas absorption of the electrode plate, etc. Can withstand the pressure even if it is applied to the short side surface. Also, on the outer surface of the short side wall of the battery case, a number of vertical ribs arranged in parallel with the vertical direction of the battery case are provided, and horizontal ribs connecting these vertical ribs in the horizontal direction are arranged at the upper ends of the vertical ribs. As a result, the strength of the members on the short side wall is greatly increased. Also, as mentioned above,
Since the plurality of welding edges along the short side are formed on the upper side of the lateral rib, the welding strength also increases, and together with the increase in the strength of the member, the strength of the wall on the short side greatly increases. . Also, by forming a groove on the inner bottom surface along the inner walls of both long side walls, sediment falling from the side of the electrode plate group is collected in this groove, and the anode plate And the risk of causing a short circuit by connecting the battery and the cathode plate. The plates are held by the flat bottom surface between the grooves. For this reason, a stable storage state is obtained in which no local force is applied to the bottom or edge of each electrode plate and there is no risk of damage to the bottom or both side edges of each electrode plate. Also, by making the width of the flat part of the bottom slightly smaller than the width of the electrode plate,
The edges at both ends of the bottom of the electrode plate do not pierce the corners of the bottom and side surfaces of the battery case, thereby reducing damage to the separator. Therefore, furthermore, by providing a plurality of welding edges, the heat welding of the battery case is stabilized, the strength of the welding surface is increased, and the strength of the entire battery case is increased. In addition, the cause of trouble such as short circuit due to the precipitate is reduced, and a battery with excellent durability can be provided.

[0008]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a battery case 1 of a storage battery according to the present invention.
FIG. 2 is a side sectional view showing a structure of a sealed lead-acid battery using the same. In FIG. 1, the battery case structure of the storage battery of the present invention includes electrode plates 3 in each cell chamber 2 of a monoblock type battery case 1.
Is stored. The electrode groups 3 in each cell chamber 2 are connected by connecting the different polarity terminals 4 of the adjacent electrode groups 3 by inter-cell connectors 6 penetrating the cell chamber partition wall 5 of the battery case 1. I have. A plurality of (two in FIG. 1) welding is performed on the upper edge portion 9 of the member 8 on the short side wall of the battery case 1 that contacts the outermost electrode plate 7 of the electrode group 3 housed in the battery case 1. An edge 10 is provided.

On the outer wall of the short side member 8 of the battery case 1, a plurality of parallel vertical ribs 11 are arranged in the vertical direction of the battery case. At an upper end of the vertical rib 11, a horizontal rib 12 for connecting the vertical ribs 11 in a horizontal direction is provided. Above the horizontal ribs 12, the plurality of welding edges 10 are formed in parallel with the short side members 8. The vertical ribs 11 and the horizontal ribs 12 are formed integrally with the battery case 1.

FIG. 2 is a side sectional view of the battery case 1 of the present invention. As shown in FIG. 2, the total width w perpendicular to the longitudinal direction of the welding edge 10, that is, in the direction between the inner surface and the outer surface of the battery case 1 is equal to the thickness t of the short side member 8 of the battery case 1. It is chosen larger.

FIG. 3 is a partially cutaway front view of the battery case 1 as viewed from the short side, and FIG. 4 is a front sectional view taken along a plane parallel to the short side of the battery case 1. As shown in FIGS. 3 and 4,
On the inner surface of the battery case bottom member 13, a left long side member 14A is provided.
A groove 16A is formed along the inner wall 15A. Another groove 16B is formed on the inner wall 15B of the right long side member 14B.
Are formed along. These two grooves 16A and 16B
The electrode plate group 3 is held by the flat bottom surface 17 between them.
The through hole 18 is provided through the cell chamber partition wall 5 of the battery case 1, and electrically connects the adjacent different polarity terminals 4 of the electrode plate group 3 housed in the adjacent cell room 2 of the battery case 1. An inter-cell connector 6 for connection is provided through the through-hole 18.

As shown in FIG. 1, the upper opening of the battery case 1 is closed by a lid 19. The lid 19 is composed of the two welding edges 10 of the short side member 8 of the battery case 1 shown in FIG.
4 and welding edge 21 of cell chamber partition wall 5
, And are hermetically sealed by heat welding the corresponding welding edges and the welding surface of the lid 19. FIG.
5 is a partially enlarged view of a corner portion indicated by an arrow A in FIG.
2 shows a detailed configuration of the welding edge portion 10. The thermal welding is performed, for example, by the following method. The battery case 1 and the lid 19 are positioned at the correct welding positions, and a hot plate heated to a predetermined temperature is sandwiched between the two. The hot plate is a plate-like member made of iron, aluminum, titanium, ceramic, or the like. The welding edges 10, 20 and 21 of the battery case 1 are in contact with the lower surface of the hot plate, and the welding surfaces 22, 25 and 23 of the lid 19 are in contact with the upper surface of the hot plate and are heated by the heat of the hot plate. Next, the hot plate is removed, and a predetermined pressure is applied between the electrode 1 and the lid 19. As a result, the corresponding welding edges and the welding surfaces are welded. In the present invention, since two welding edges are provided, it is difficult for a bending moment to bend the welded portion in a V-shape, and it is difficult for the portion to be cracked and come off. The lid 19 has a battery case 1
A safety valve 24 for internal pressure control corresponding to each cell chamber is provided.

[0013]

The battery case of the storage battery according to the present invention has an outward force applied to the short side surface of the battery case due to the group pressure of the electrode group or the pressure increase of the gas generated during charging, or when the storage battery is left unattended. In order to support the inward force due to the decrease in internal pressure caused by gas absorption, a vertical rib is provided to strengthen the short side member itself. Further, a horizontal rib for integrally connecting the vertical ribs is provided, and a plurality of welding edges are provided on the horizontal rib, and the plurality of welding protrusions are thermally welded to the welding surface on the back surface of the lid. As a result, the welding area is increased, and the welding strength between the short side member and the lid is greatly increased. Further, by making the entire width (w) of the welding edge portion larger than the thickness of the short side surface member, the welding fixing width between the battery case and the lid is increased, and the strength is further increased. Therefore, it is possible to provide a battery having a strong battery case and stable quality in a production process without increasing the thickness of the side surface of the entire battery case and increasing the weight.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a storage battery of the present invention cut along a plane perpendicular to a pole plate (a plane parallel to a long side surface).

FIG. 2 is a cross-sectional view taken along a plane parallel to a long side surface of a battery case of the storage battery.

FIG. 3 is a partially cutaway front view of the storage battery seen from a short side.

FIG. 4 is a cross-sectional view taken along a plane parallel to the short side of the battery case of the storage battery.

FIG. 5 is a perspective view of a battery case of the storage battery.

6 is a partially enlarged view of a corner portion indicated by an arrow A in FIG.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 battery case 2 cell room 3 electrode plate group 4 different polarity terminal 5 cell room partition wall 6 inter-cell connector 7 outermost electrode plate of electrode plate group 8 battery case short side member 9 upper edge of short side member 10 welding edge Part 11 Vertical rib 12 Horizontal rib 13 Battery case bottom member 14A, 14B Long side member 15A, 15B Long side inner wall 16A, 16B Groove 17 Bottom surface

Claims (3)

(57) [Claims] An electrode group is accommodated in each cell chamber of a monoblock type battery case which is divided by a cell chamber partition wall, and the cell chamber is connected between different polarity terminals of the electrode groups of adjacent cell chambers. In the storage battery connected by the inter-cell connector penetrating the partition wall, the outer wall of a member constituting a short side surface of the battery case outside the outermost electrode plate of the electrode group housed in the battery case is parallel to a vertical direction of the storage battery. arranging a plurality of longitudinal ribs, arranged transverse ribs for connecting the longitudinal ribs in the horizontal direction at the upper end of the longitudinal ribs, said battery jar
Multiple welding edges parallel to the upper edge of the member that constitutes the short side
Having a portion, one of the plurality of welding edges is an outer one,
A battery case for a storage battery, wherein the battery case partially extends over an upper surface of the horizontal rib . 2. A method according to claim 1, wherein a total width (w) of said plurality of parallel welding edges in a direction perpendicular to a longitudinal direction is larger than a thickness of a member constituting a short side surface of said battery case. A battery case of the storage battery according to 1. 3. In the vicinity of the intersection of the long bottom surface perpendicular to the short side surface of the battery case facing the outermost electrode plate of the electrode group housed in the battery case of the storage battery and the inside bottom surface of the battery case, The battery case according to claim 1, wherein a groove is formed in each of the portions along the both long side surfaces, and a flat bottom surface between the two grooves is a portion for holding the electrode plate group.