JPH0320859B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for regenerating a disconnected inter-cell connection.

[Prior Art] Conventionally, as shown in FIG. There is a method in which two intercell connectors 3 or 5 connected to a strap 7 are resistance welded using an electrode 1 or 4.

The inter-cell connection method using the inter-cell connection body 3 having protrusions 3a as shown in FIG. The cell-to-cell connection method using 5 is generally called the flat plate type. In any of these cases,
The shape of the inter-cell connector 3 or 5 is an important factor in performing good welding. That is, in the protrusion type, the protrusions 3a of the two inter-cell connectors 3, 3 are inserted into the through-holes 2a of the partition wall 2 and compressed by the electrodes 1, so that the protrusions 3a are connected to each other as shown in FIG. 2A. Since resistance welding is used, the diameter and height of the projection 3a must be accurately defined within a predetermined range. In addition, in the flat plate type, the two flat plate-shaped inter-cell connectors 5, 5 are pressed by the electrode 4, and the opposing parts of both the inter-cell connectors are inserted into the through-hole 2a of the partition wall 2, as shown in FIG. 2B. Since the press-fitted portion 5b is formed by press-fitting and resistance welded, the thickness of the inter-cell connection body 5, particularly the thickness of the portion to be resistance-welded, must be accurately defined within a predetermined range.

[Problems to be Solved by the Invention] By the way, if a defect occurs inside the cell or in the inter-cell connection part during the manufacturing process after the inter-cell connection of the storage battery is made, the above-mentioned inter-cell connection body 3 or 5 may be Connections or welds may need to be cut to repair the defect or the cell may need to be replaced. Figure 3A
3B shows a state in which the welded portion of the intercell connection body 3 is cut, and FIG. 3B shows a state in which the welded portion of the intercell connection body 5 is cut. As seen in these drawings, when the welded parts of two intercell connections 3 or 5 are cut, the shape of each intercell connection becomes different from the shape before welding. It was thought that the cut intercell connector 3 or 5 could not be used again. Therefore, in the past, the cut intercell connectors were discarded, which lowered the production yield and was uneconomical.

An object of the present invention is to propose a method for regenerating an intercell connection body cut at a weld as described above.

[Means for solving the problems] The configuration of the present invention for solving the above problems is shown in FIGS. 4, 5 A, B, and 5 corresponding to the embodiments.
This will be explained below with reference to FIG. 6, and FIGS. 7A and 7B.

In the first invention, first, a predetermined amount of lead or a lead alloy is supplementally welded to the cut end 3b of the protrusion 3a of the inter-cell connector 3 to form a supplementary welded portion 9. This cut end 3b is used to connect the protrusions 3a of the inter-cell connector 3 to the protrusions 3a of the inter-cell connector 3 of an adjacent cell by welding through the through-hole 2a of the partition wall 2 of the battery case. , which is the tip of the protrusion 3a that was cut and separated due to poor welding. Next, supplementary welding part 9
is pressed by a press machine 11 having a recess 11a of a predetermined shape to reproduce a protrusion of a predetermined shape.

In the second invention, first, a predetermined amount of lead or a lead alloy is supplementally welded to the recessed portion 5a of the inter-cell connector 5 to form a supplementary welded portion 9. In this inter-cell connector 5, the portion facing the inter-cell connector 5 of the adjacent cell is pressed to form a recessed portion 5a, and the press-fit portion 5b is welded to the through-hole 2a of the partition wall 2 of the battery case to form an inter-cell connector. When making the connection, it was cut and separated due to poor welding. Next, the inter-cell connection body 5 is pressed into the press machine 1.
2 to flatten the supplementary welded part 9 and the cut press-fitted part 5b.

[Operation of the Invention] In both the first and second inventions, lead or a lead alloy is replenishably welded to the deformed portion of the cut cell-to-cell connection portion, and the shape of the deformed portion can be regenerated by pressing. As a result, even if it is discovered that there is a defective part inside the cell or in the cell-to-cell connection after cell-to-cell connection, and the cell-to-cell connection is cut and the cell is pulled out from the battery case, the broken cell-to-cell connection can be removed. can be easily reproduced, improving yield.

[Example] An example of the present invention will be described with reference to the drawings. First, the case of the protruding type will be explained. In this case, as shown in FIG. 4, lead or lead alloy 6 having the same composition as the inter-cell connector 3 is welded to the cut end surface 3b of the deformed protrusion 3a after cutting the welded part to form a supplementary welded part 9. do. Next, as shown in FIG. 5A, the inter-cell connector 3 with the cut ends 3b refilled is placed on the press stand 10 together with the thickness regulating piece 13, and the predetermined recess 11a is placed on the press surface. It is pressed and molded using a press machine 11 equipped with a press machine 11 as shown in FIG. 5B. As a result, the inter-cell connector 3 provided with the protrusion 3a having a predetermined shape as shown in FIG.
is played. Such an inter-cell connection body 3 is shown in FIG. 1A.
As shown in FIG. 2A, by welding the inter-cell connecting bodies 3 together again,
It is possible to reuse the recycled inter-cell connector.

Next, the case of the flat plate type will be described using FIGS. 6 and 7. In this case, the intercell connection body 5 cut at the welding part has a press-fitting part 5b having an irregularly shaped cut end 5c, as shown in FIG. 3B, and an electrode as shown in FIG. 1B. A depressed portion 5a is formed due to the pressure applied in step 4. As shown in FIG. 6, this recessed portion 5a is filled with lead or lead alloy 6 having the same components as described above, and the welded portion 9 is supplemented.
form. Next, the inter-cell connecting body 5 with the recessed portion 5a filled is placed in the frame 13 as shown in FIG. 7A.
It is placed on the press table 10, and pressed and formed by the press machine 12 as shown in FIG. 7B.
As a result, an inter-cell connection body 5 whose both surfaces are reproduced to be flat is obtained. By arranging the inter-cell connectors 5 as shown in FIG. 1B and welding the inter-cell connectors 5 together again as shown in FIG. 2B, the cut inter-cell connectors can be reused. can be used.

Note that FIGS. 8A and 8B are process flow diagrams in the case of concretely implementing the embodiments of the first invention and the second invention.

[Effects of the Invention] As described above, according to the first and second inventions, it is discovered that there is a defective part inside the cell or in the inter-cell connection after the inter-cell connection, and the inter-cell connection is disconnected. After the cells are pulled out from the battery case, the disconnected inter-cell connections can be easily regenerated, so that production yield can be improved.

[Brief explanation of drawings]

Figures 1A and B are cross-sectional views of main parts showing embodiments of intercell connections using intercell connectors of different shapes, and Figures 2A and B are different connections corresponding to the connection methods shown in Figures 1A and B, respectively. 3A and 3B are sectional views showing a state in which the intercell connections in FIGS. 2A and B are cut, respectively. FIG. 4 is a sectional view showing the intercell connection in FIG. 3A. Cross-sectional view showing the state in which lead or lead alloy is supplemented and welded to the cut end of
Figures A, B, and C are explanatory diagrams showing the process of press-molding and regenerating the intercell connector in Figure 4, and Figure 6 is
A cross-sectional view showing the replenishment of lead or lead alloy into the depressed portion of the inter-cell connector shown in Figure B. Figures 7A and B show the process of press-forming and regenerating the inter-cell connector shown in Figure 6. The explanatory drawings and FIGS. 8A and 8B are process flow diagrams. 1, 4... Electrode, 2... Partition wall, 2a... Through hole, 3, 5... Inter-cell connection body, 3a... Projection,
5a... recessed part, 5b... press-fitting part, 5c... cut end, 6... lead or lead alloy, 7... strap,
8... Plate group, 9... Replenishment welding part, 10... Press stand, 11, 12... Press machine, 11a... Recessed part.

Claims (1)

[Claims] 1. Cut end 3b of protrusion 3a of inter-cell connection body 3
A predetermined amount of lead or lead alloy is supplementally welded to form a supplementary welding part 9, and the cut end 3b is such that the protrusion 3a of the inter-cell connector 3 is connected to the through hole 2a of the partition wall 2 of the battery case.
This is the tip of the protrusion 3a that was cut and separated due to poor welding when connecting the cells to the protrusion 3a of the intercell connection body 3 of an adjacent cell by welding, and then the supplementary welded part 9 was formed into a predetermined shape. A method for regenerating a cut cell-to-cell connector by pressing it with a press machine 11 having a recess 11a to regenerate a protrusion of a predetermined shape. 2. Replenishment welding a predetermined amount of lead or lead alloy to the recessed portion 5a of the inter-cell connection body 5 to form a replenishment welded portion 9;
The inter-cell connector 5 is connected to the inter-cell connector 5 of the adjacent cell.
When the press-fitted part 5b was welded to the through-hole 2a of the partition wall 2 of the battery case to form a connection between cells, it was cut and separated due to poor welding. A method for regenerating a cut cell-to-cell connection body, in which the cell-to-cell connection body 5 is then pressed by a press 12 to flatten the supplementary welded portion 9 and the cut press-fit portion 5b.