JPS6338530Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a thin plate-shaped lead battery, and particularly relates to improvement of the current collector of each unit cell.

Prior Art FIGS. 1 to 3 are an exploded perspective view and a partially enlarged sectional view of a conventional technology.

In the figure, 1 is an anode plate, 2 is an anode plate,
PbO (lead monoxide) on each synthetic resin net 3
Sheet-like active material layers 1a and 2a are pressed together by rolling an active material paste mainly consisting of .
Further, on one side of the active material layers 1a and 2a,
A flat current collector 4 in which a shallow recess is formed is crimped to form cathode and anode plates 1 and 2. The flat current collector 4 is made of a Pb-Ca alloy, and is bonded to an exterior body 5 made of ABS resin or the like, which constitutes a part of the battery case, with an adhesive such as an epoxy resin. This example shows a 6V lead-acid battery, and the flat current collector is
Three pieces are bonded to one exterior body 5, for a total of six pieces. In addition, a through hole 6 is provided at a position facing each of the flat current collectors 4 of the exterior body 5, and a part of the flat current collector 4 facing the through hole 6 is filled with epoxy resin or the like. The adhesive is not attached to the terminal portion 7 of each unit cell A. 8 is a battery case frame body, and a plurality of chambers 10 are formed in this frame body 8 by partition walls 9.

As shown in FIGS. 1 and 3, these elements are housed side by side in each chamber 10 of the battery case with the cathode and anode active material layers 1a and 2a facing each other with a separator 11 in between. The active material layers 1a and 2a are brought into close contact with the flat current collector 4 adhered to the outer casing 5, and the frame 8 and the outer casing 5 are bonded together by adhesive or high-frequency welding while applying an appropriate construction pressure. Seal tightly. Next, the terminal portions 7 of each unit cell A are connected through the through holes 6 with the conductive members 12. Conductive member 12
For example, copper foil is used. Then, in order to prevent mechanical damage to the conductive member 12 and to provide electrical insulation, the conductive member 12 is covered with a polyester film or the like. Thereafter, a sulfuric acid electrolyte having a specific gravity of 1.30 is injected into the separator 11 through an inlet (not shown), impregnated and held in the separator 11, and the inlet is sealed to obtain a thin lead-acid battery. In the figure, reference numeral 15 is a rivet terminal, which is connected to the conductive member 12 and constitutes an external terminal.

A problem with lead-acid batteries as described above is that the sulfuric acid electrolyte impregnated in the separator 11 flows around to the side of the flat current collector 4 in contact with the exterior body 5 due to capillary action. In this case, there was a risk that the conductive member 12 would come into contact with the sulfuric acid electrolyte, corrode them, and shorten the battery life.

Purpose of the invention The present invention was devised in view of the drawbacks of the above-mentioned conventional examples, and its purpose is to prevent the sulfuric acid electrolyte from coming into contact with the conductive member, thereby extending the life of the battery.

Structure of the invention The lead-acid battery of the invention consists of a battery case, a unit cell, a connecting body 12, and an acid-resistant resin layer 13, and the battery case has a plurality of cells partitioned by a partition wall 9. The unit cell is composed of a chamber 10 and an exterior body 5, and is composed of negative and positive electrode plates 1 and 2 and a separator 11. Each of the negative and positive electrode plates 1 and 2 has an active material on one side of a flat current collector 4. The separator 11 is arranged between the negative and anode plates 1 and 2, and the acid-resistant resin layer 13 is made of a different type of resin from the battery case. The unit cells are housed in each chamber 10 of the battery case, and the connection body 12 is connected to the flat current collector 4 of the adjacent unit cell via the connection part 20. The acid-resistant resin layer 13 is formed between the flat current collector 4 and the exterior body 5, and the connecting body 12, the connecting portion 20, the flat current collector 4, and the acid-resistant resin layer 13 are formed between the flat current collector 4 and the exterior body 5. It is characterized in that it is held in the exterior body 5 by insert molding.

Embodiment FIG. 4 is a sectional view showing an embodiment of the present invention, and FIG. 5 is a perspective view showing a conductive member and a current collector. In these figures, the same parts as in the conventional example are given the same reference numbers, and detailed explanations are omitted.

In FIGS. 4 and 5, a conductive member 12 connecting two adjacent flat current collectors 4 is spot-welded to each flat current collector 4 at both ends thereof.
The flat current collector 4 to which the conductive member 12 is welded is molded into the exterior body 5 made of ABS resin by insert molding. , active material layer 1a,
An acid-resistant resin layer 13 is formed on the side opposite to the side to which 2a is pressed. As the material for this acid-resistant resin layer 13, epoxy resin, silicone resin, or fluorine resin is suitable. These resins have acid resistance and also heat resistance, so that even if the flat current collector 4 is heated by a large current, it will not be easily damaged. In addition, the acid-resistant resin layer 13 may have a sheet-like form,
It may be a liquid type that is applied to the surface of the flat current collector 4 before being molded. However, in this case, it must be hardened by heat or the like when molded.

Note that the part indicated by the two-dot chain line is the gate 14 when the exterior body 5 is molded with resin by injection molding.
This is the part that becomes. As shown in the figure, the reason why this gate 14 is provided at the approximate center of the acid-resistant resin layer 13 is that the liquid acid-resistant resin layer 13 hardens quickly due to the high-temperature, high-pressure ABS resin flowing out from the gate 14. This is because it was aimed at

Effects of the invention: Since the acid-resistant resin layer is formed on the side of the current collector opposite to the side to which the active material layer is pressed, even if the sulfuric acid electrolyte were to connect with the acid-resistant resin layer and the current collector due to capillary action, etc. Even if it goes around between the two, it will not come into contact with the conductive member. Therefore, there is no risk of this being corroded. In particular, when an epoxy resin is used as the acid-resistant resin, the effect of adhering the exterior body (container case) and the current collector can be expected, and the above-mentioned effect will be more pronounced.

Moreover, since the conductive member with low mechanical strength is also molded into the exterior body (container case), it will not be easily cut by external force.

[Brief explanation of the drawing]

1 to 3 show a conventional example, in which FIG. 1 is an exploded perspective view, FIG. 2 is a partial perspective view, and FIG. 3 is a partial sectional view. 4 and 5 show an embodiment of the present invention, with FIG. 4 being a partial sectional view and FIG. 5 being a perspective view of a current collector. DESCRIPTION OF SYMBOLS 1... Cathode plate, 2... Anode plate, 1a... Cathode active material layer, 2a... Anode active material layer, 3... Synthetic resin net, 4... Flat current collector, 5... Exterior body ( battery case), 6... through hole, 7... terminal section, 8... frame body,
9... Partition wall, 10... Chamber, 11... Separator, 12... Conductive member, 13... Acid-resistant resin layer,
14...gate, 20...connection section.

Claims (1)

[Claims for Utility Model Registration] 1. Consisting of a battery case, a unit cell, a connector 12, and an acid-resistant resin layer 13, the battery case has a plurality of chambers divided by a partition wall 9. 10 and an exterior body 5, the unit cell consists of negative and anode plates 1 and 2 and a separator 11, and each of the negative and anode plates 1 and 2 has an active material layer 1a on one side of a flat current collector 4. ,2
a, and the separator 11 is formed by crimping the negative,
The acid-resistant resin layer 13 is arranged between the anode plates 1 and 2, and the acid-resistant resin layer 13 is made of a different type of resin from that of the battery case, and each chamber 10 of the battery case has the A unit cell is housed therein, the connecting body 12 is connected to the flat current collector 4 of the adjacent unit cell via the connecting part 20, and the acid-resistant resin layer 13 is connected to the flat current collector 4 of the adjacent unit cell.
and the exterior body 5, and the connection body 12, the connection portion 20, the flat current collector 4, and the acid-resistant resin layer 13 are held in the exterior body 5 by insert molding. lead-acid battery. 2 Utility model registration claim 1 characterized in that the acid-resistant resin 13 is an epoxy resin
Lead-acid batteries as described in section. 3 Utility model registration claim 1, characterized in that the acid-resistant resin 13 is a silicone resin
Lead-acid batteries as described in section. 4. The lead-acid battery according to claim 1, wherein the acid-resistant resin 13 is a fluorine-based resin. 5 Utility model registration claim 1, characterized in that the acid-resistant resin 13 is in the form of a sheet.
The lead-acid battery according to any one of Items 1 to 4. 6. The lead-acid battery according to any one of claims 1 to 4, wherein the acid-resistant resin 13 is in a liquid state before being molded.