JPH02201866A - Intercell connecting method for storage battery - Google Patents

Abstract

PURPOSE:To prevent scattering downward of molten blocks even if they are produced in resistance welding by forming connecting lug plates so that the upper part is thicker than the lower part. CONSTITUTION:Connecting lug plates 1, 1 are faced from both sides of a parti tion 2 which partitions cells in a container, and they are connected through a passing through hole 3 by melting with welding guns 9. The lug plates 1, 1 are formed so that the side in contact with the partition 2 forms vertical surface and the opposite side forms slant whose taper angle theta is 0.1 deg.-0.5 deg. and the lower part is thicker than the upper part. When the lug plates 1, 1 are melted with welding guns 9 for connecting, even if molten blocks are produced, scattering downward of them are prevented because the down side of the lug plate is thicker than the upper side. The short circuit between cells caused by the molten blocks is prevented.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a method for connecting cells of a storage battery.

[Conventional technology]

Conventionally, there is a method of connecting cells of a lead-acid battery using a pair of welding guns as follows. That is, on both sides of a through hole provided in a partition wall that partitions the interior of the battery case into a plurality of cell chambers, connecting ear plates of mutually different polarity extending from the cells in the cell chambers on both sides of the partition wall are arranged facing each other. Using a pair of welding guns each having a protrusion at the center of the inner surface, the connecting ear plate is pressurized and the center portion of the connecting ear plate is pushed into the through hole for resistance welding. Connection between the cells is achieved by uniformly pressing the peripheral portion onto both wall surfaces of the outer periphery of the through hole of the partition wall.

[Problem to be solved by the invention]

According to the above conventional method, when the welding gun performs resistance welding as described above, the contact resistance of the central part of the connecting ear plate increases in the through hole, causing the current to become too high. Lead may dissolve too much due to such reasons as In this case, if the connection ear plate is weakly pressed against both wall surfaces of the outer periphery of the through hole of the partition wall, the excess molten lead in the through hole may be pressed against the partition wall surface. It may be violently splashed outside from between the surface of the connecting ear plate. When this molten lead splatter occurs, the biggest problem is that the splattered lead falls onto both cells below, causing a short circuit between the cathode and anode plates, which prevents the battery from functioning properly. is to lose.

[Means to solve the problem]

The present invention eliminates the disadvantages of the conventional connection method, prevents the molten lead from flying downward during resistance welding between the two connection ears, and prevents short circuits between the cell plates. This method provides a cell-to-cell connection method for a storage battery, in which cells in the cell chambers on both sides of the partition wall are connected on both sides of a through-hole provided with a partition that partitions the inside of the battery case into multiple cell chambers. Connecting ear plates of different polarity extending from each other are arranged facing each other and have a protrusion at the center of the inner surface. Pressure is applied to the connecting ear plates with a pair of welding guns, and the central part of the connecting ear plates is pressed into place. In a cell-to-cell connection method for a storage battery, in which cells are press-fitted into a through-hole and resistance welded, and the peripheral portion of the cell is press-fitted to the outer peripheral wall surface of the through-hole of the partition wall, the cells facing each other on both sides of the through-hole of the partition wall are used. Each ear plate of the connecting ear plate is formed into a tapered ear plate whose opposing inner surface to be crimped to the partition wall surface is a vertical plane and whose thickness becomes thinner toward the upper end. It is characterized in that the outer surfaces of both tapered ear plates are pressurized by the pair of welding guns.

[For production]

According to the present invention, when the outer surfaces of the tapered ear plates facing both sides of the through-hole of the partition wall are pressurized with the pair of welding guns, the vertical inner surfaces thereof are connected to the peripheral wall of the through-hole of the partition wall. The center portions of both tapered ear plates are pressurized by the protrusions of a pair of welding guns and bent into the through-hole and pressed against each other. When the periphery of the through hole in the wall is crimped to both wall surfaces of the partition wall, the relatively thick lower portions of the tapered ear plates on both sides corresponding to the lower walls of the through hole of the partition wall are thicker than the upper portions. The pressurizing force of the pair of welding guns causes particularly strong pressure bonding to both sides of the lower wall of the through hole of the partition wall. Therefore,
Even if excessive molten lead is generated during resistance welding between the central portions of the ear plates due to the pressurized energization by the welding gun, the molten lead will flow through the through hole to both sides of the lower part of the through hole of the partition wall. The strong mutual pressure bonding between the wall surface and the lower part of both ear plates prevents it from flying outward.

In this case, when the taper angle of the outer inclined surface of the tapered ear plate is about 0.1° to 1° with respect to the vertical plane, the area around the central protrusion when not pressurized by a pair of welding guns is The part provides good crimping over the entire surface of the opposing surface of the peripheral wall of the through-hole of the partition wall, and also provides particularly strong mutual crimping between the lower part of the through-hole of the partition wall and the lower part of the ear plate facing thereto. It is perfect for bringing.

〔Example〕

Next, one example of implementation of the present invention will be described based on the accompanying drawings.

FIG. 1 shows an example of a pair of ear plates 1, 1 used in the inter-cell connection method of the present invention, and FIGS. 1 implementing the inter-cell connection method of the present invention
Give an example. Reference numeral 2 denotes a partition wall that partitions the interior of the storage battery case into a plurality of cell chambers, and the partition wall 2 has a through hole 3 for connection between cells on one side or the other side of its upper part. On both sides of the through hole 3, connecting ear plates 1.1 of opposite polarity are arranged closely facing each other on both sides. The ear plate 1.1 has horizontal substrates 4, 4 integrally molded on the lower end thereof, so that the respective polarity poles are arranged on the upper surface 1 side or the other side of the cells accommodated on both sides of the partition wall 2. According to the present invention, the ear plates 1, 1, which are disposed opposite to each other on both sides of the through hole 3, are connected to one end of a strap connecting the ear rows of the plates. .1. That is, in each of these two ear plates 1, 1, the opposing inner surface 5 to be crimped to the partition wall 2 is as follows:
A tapered ear plate 1.1 is formed, which is the same vertical plane as the wall surface 6 of the partition wall 2, and whose thickness becomes thinner toward the upper end.

As a result, the slopes of the outer slopes 7, 7 formed on the tapered ear plates 1.1 are generally equal, and the taper angle θ of the slopes 7 with respect to the vertical plane indicated by the chain line is: , preferably about 0.1° to 1°.

The tapered ear plate 1.1 is inserted into the through hole 3 of the partition wall 2.
In order to connect the cells via the welding gun 9 having a protrusion 8 on the vertical inner surface 9a, as shown in the second figure, a conventional method is used.
If a pair of tapered ear plates 1, 1 are placed on both sides and pressure is applied from the outside, the tapered ear plates 1, as shown in the third figure.
．． 1, the central portion 1a, Ia of the partition wall 2 is connected to the through hole 3 of the partition wall 2.
The peripheral parts 1b, 1b of the tapered ear plates 1, 1 are pressed against each other in the through hole 3, and resistance welded by applying electricity. The entire surface of the tapered ear plate 1.1 is pressed against both wall surfaces of the peripheral wall portion 2a of the through hole 3 of the partition wall 2 facing each other, and in particular, the lower wall 1b1 thereof is pressed against the upper wall 1b2.
The pair of welding guns 9,
9 is applied more strongly, and therefore the peripheral part 1b of the tapered ear plate 1.1, in particular the lower wall 1 of Ib.
bl, 1bT are the lower walls 2al of the through holes 3 of the partition wall 2;
, 2a1, the two walls 6a, 6a are strongly pressed.

Therefore, even if excessive molten lead is generated during resistance welding of the center portions 1a, 1a of the ear plates 1, 1, the lower portion u2aL2a1 below the through hole 3 of the partition wall 1 will flow downward from the through hole 3.
and the peripheral portion 1b of the ear plates 1,1, and the lower wall 1b1,1 of 1b.
Through the strong mutual crimping part with b1, it is possible to prevent the molten lead from scattering downward to the outside, and there is no fear that molten lead scattering downward will cause a short circuit between the polar plates of different polarities that make up the cell. This can be prevented and a good inter-cell connection of the storage battery can be completed.

The taper angle θ of the inclined surface 7 of each tapered ear plate 1 is 0.1
-1°, the entire surface of the inclined surface 7 can be sufficiently pressurized with the inner surface of the welding gun 9, and the ear plate 1 can be pressed against the peripheral wall 2a of the through hole 3 of the partition wall 2. It is preferable that the lower part 1b1 of the ear plate 1 is pressed particularly strongly to both wall surfaces 6a of the lower part 2a1 of the through hole 3 of the partition wall 2 facing the wall surface, as this is optimally performed.

〔Effect of the invention〕

The ear plates of the cells housed in the cell chambers on both sides of the partition wall that divides the inside of the battery case into a plurality of cell chambers are pressurized with a welding gun through the through holes in the partition wall to open the central part. In a storage battery cell connection method in which the through-holes are brought into pressure contact and resistance welded, and the peripheral wall portions are crimped to both sides of the partition wall, the inner surfaces of the two ear plates are vertical and the thickness is determined in advance. The tapered ear plate is formed into a tapered ear plate that gradually becomes thinner as it reaches the upper end, and pressure is applied to the thinner tapered ear plate using a pair of welding guns. The lower part can be pressed particularly strongly against both wall surfaces of the lower part of the through-hole of the partition wall, so that the excess molten lead that often occurs when the central parts of the ear plates are resistance welded together in the through-hole can be avoided. The molten lead is prevented from scattering below the through-hole, and therefore, it has the effect of preventing short circuits in the battery that would otherwise occur due to downward scattering of molten lead as seen in conventional cell-to-cell connections.

[Brief explanation of the drawing]

FIG. 1 is a partially cut-away side view of a connecting ear plate used in the method of the present invention, and FIGS. 2 and 3 are inter-cell connections showing steps of a method for connecting storage battery cells according to an embodiment of the present invention, respectively. Cut side views before and after connection are shown. 1... Tapered ear plate for connection 1a... Central part 1b... Surrounding part 2... Partition wall 2a... Peripheral wall part 2a1... Lower wall 3...
・Through hole 5...Inner surface of ear plate 6...Wall surface 6a of partition wall...Lower part of through hole in partition wall 7...Outside inclined surface θ of tapered ear plate...Taper angle 8・...Protrusion 9...Welding gun

Claims (1)

[Scope of Claims] 1. On both sides of a through hole provided in a partition wall that partitions the inside of the battery case into a plurality of cell chambers, connecting ear plates having mutually different polarities extend from the cells in the cell chambers on both sides of the partition wall. are arranged facing each other, and pressurizes the connecting ear plate with a pair of welding guns having a protrusion at the center of the inner surface, and pressurizes the central part of the connecting ear plate into the through hole, and performs resistance welding, In an intercell connection method for a storage battery in which the peripheral portion is crimped to the outer peripheral wall surface of the through hole of the partition wall, each ear plate of the connection ear plate facing on both sides of the through hole of the partition wall is connected to the outer wall surface of the through hole of the partition wall. The opposing inner surface to be crimped to the partition wall surface is a vertical surface, and the thickness is formed into a tapered ear plate whose thickness decreases toward the upper end, and the outer surfaces of both tapered ear plates are bonded with the pair of welding guns. A method for connecting cells of a storage battery, characterized by applying pressure. 2. The method for connecting cells of a storage battery according to claim 1, wherein the taper angle between the outer surface of the tapered ear plate and the vertical surface is about 0.1° to 0.5°.