JPH041649Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to an improvement in the inter-cell connection portion of a sealed lead-acid battery made of a Pb-Ca alloy lattice or the like.

BACKGROUND ART Conventionally, in a sealed lead-acid battery in which electrode plates of adjacent cells are connected by straps, the anode strap, the cathode strap, and the connecting portion between them have the same thickness.

Problems that the invention aims to solve In the sealed lead-acid battery described above, the electrode plates of adjacent cells are connected at the height of the strap, but the Pb-Ca
In lead-acid batteries made of alloy lattices, so-called elongation occurs in the anode plate due to intergranular corrosion. Due to this elongation, the anode plate enlarges from a rectangular shape to a so-called barrel shape in the direction of the electrode plate surface. However, there is a limit to the expansion in the downward and lateral directions depending on the battery case, and because sealed lead-acid batteries have an electrolytic solution held in the anode and cathode plates and separators, pressure is applied in the direction in which the plates are stacked. The structure is such that the electrode plate surface is difficult to bend. Therefore, the anode plate extends significantly upward. Due to the stress of this elongation, the crossing portion 5' between the anode and cathode straps 3 and 2 is greatly curved, as shown in FIG. 2B.
Due to the curvature, the thickness of the crossing portion 5' becomes thinner and a large strain is generated inside the crossing portion 5', which significantly reduces the mechanical strength of the crossing portion 5', and reduces the mechanical strength of the crossing portion 5' due to vibrations during transportation and other vibrations. Disconnection at the crossing portion 5' between the straps 3 and 2, and disconnection between the cathode plate 1 and the cathode strap 2 may occur, resulting in a short battery life and a fire point inside the battery.

The present invention aims to eliminate the above drawbacks.

Means for Solving the Problem To achieve this object, the present invention provides a sealed lead-acid battery having respective electrode groups in adjacent cells, each electrode group having a cathode strap 3 and an anode strap 4. The electrode plates of adjacent cells have a cathode strap 3 and an anode strap 4.
are connected via a crossing section 5, and the crossing section 5 is characterized in that it is thicker than the other parts of the cathode strap 3 and anode strap 4.

Function: As a result, mechanical strength can be ensured against the strain occurring at the crossing portion between the straps due to the elongation of the anode plate, the shortening of battery life can be avoided, and safety can be ensured.

Example An embodiment of the present invention will be described.

Figure 1A is a front view of a sealed lead-acid battery having the structure of the present invention with the upper part of the container removed. Even if elongation occurs in the anode plate 4 due to intergranular corrosion and the anode strap 3 is pushed up as shown in FIG. , battery life is longer than that of a sealed lead-acid battery with a conventional structure.
Significant improvements in safety can be achieved.

Effects of the invention As mentioned above, in a sealed lead-acid battery having the structure of the invention, reduction in mechanical strength due to curvature of the crossing portion between straps due to elongation of the anode grid is prevented, and shortening of battery life due to wire breakage is prevented. It has great practical value in that it can ensure safety.

[Brief explanation of the drawing]

Figures 1A and 1B show an embodiment of the present invention, a front view with the top of the battery case removed, and Figure 2 shows a conventional sealed lead-acid battery with the top of the case removed. FIG. 1 is a cathode plate, 2 is a cathode strap, 3 is an anode strap, 4 is an anode plate, 5 and 5' are the crossing parts between the anode and cathode straps, 6 is a battery case partition, and 7 is a battery case.

Claims (1)

[Scope of Claim for Utility Model Registration] A sealed lead-acid battery having a group of electrode plates in each adjacent cell, each electrode group having a cathode strap 3 and an anode strap 4, and the electrode plates of the adjacent cells. The group is a sealed lead-acid battery in which a cathode strap 3 and an anode strap 4 are connected via a crossing part 5, and the crossing part 5 is thicker than other parts of the cathode strap 3 and anode strap 4.