JPH0433652Y2 - - Google Patents

Description

[Detailed explanation of the idea]

《Industrial Application Field》 This invention relates to a battery assembly made by connecting a plurality of button-shaped cells in parallel. <Prior Art> As is well known, in order to improve the high-load discharge performance and low-temperature discharge performance of a battery, it is important to increase the reaction area between the positive electrode and the negative electrode. Conventionally, as structures for increasing the reaction area within a limited battery volume, a structure in which a band-shaped power generation element is spirally wound and a structure in which sheet-shaped power generation elements are laminated in multiple layers have been adopted. 《Problem that the invention aims to solve》 However, compared to button-shaped batteries with a simple structure, the assembly process for these batteries with a special structure is extremely complicated, and the batteries must therefore be expensive. do not have. The purpose of this invention is to use button-shaped batteries with a simple structure to construct an assembled battery that is particularly excellent in short-circuit current, high-load discharge performance, and low-temperature discharge performance. <Means for Solving the Problems> In order to achieve the above object, the assembled battery of this invention has a positive electrode, a separator, and a negative electrode arranged in a stacked manner with a sealing gasket interposed between the positive electrode can and the negative electrode terminal plate. It consists of a plurality of button-shaped unit cells and a bottomed cylindrical metal exterior can in which these unit cells are stacked and housed. Stacking the positive electrode cans of a plurality of button-type cells with their bottom surfaces joined together,
The circumferential surface of the positive electrode can is spot welded to the outer can, and the negative terminal plates of each unit cell are connected to each other by a predetermined conductor while being insulated from the outer can via an insulating sheet. The negative terminal plate of the upper unit cell is exposed through the opening of the outer can. <<Example>> Fig. 1 shows an example of the present invention using two button-shaped unit cells. In the same figure, 10 and 1
Reference numeral 2 is a button-type cell battery having exactly the same configuration, and preferably a lithium battery is used. As is well known, the structure of a button battery is as follows: positive electrode cans 10a, 1
2a, dish-shaped negative electrode terminal plates 10b and 12b, and an annular sealing gasket (not shown) constitute a battery case, and a positive electrode, a separator, and a negative electrode are stacked inside the case. The positive electrode cans 10a, 12a also serve as positive electrode terminals, and the negative electrode terminal plates 10b, 12b naturally serve as negative electrode terminals. Reference numeral 14 denotes a cylindrical metal outer can with a bottom, the inner diameter of which is slightly larger than the outer diameter of the button-shaped unit cells 10, 12, and the height thereof approximately equal to the height of two unit cells 10, 12. An insulating sheet 16 is placed on the inner bottom surface of the outer can 14, on which the unit cell 12 is placed with the negative terminal plate 12b facing down, and further above that, the unit battery 10 is placed with the negative terminal plate 10b facing up. ing. In other words, the two unit cells 10 and 12 are connected to each other by the positive electrode can 10.
A and 12a are stacked and housed inside the exterior can 14 with their bottom surfaces joined together. Negative terminal plates 10b and 12b of unit cells 10 and 12
and are mutually connected by a lead plate 18. As shown in FIG. 2, the lead plate 1 is shaped like a belt.
8 is provided with an insulating coating 20, and both ends thereof are spot welded to the negative terminal plates 10b and 12b, respectively.
It is completely insulated from a and 12a. Further, the outer peripheral surfaces of the positive electrode cans 10a and 12a are in contact with the inner peripheral surface of the metal can 14, and as shown by A and B in the figure, the positive electrode can 10a and the outer can 14 are spot welded. The negative terminal plate 10b of the upper unit cell 10 is exposed at the opening of the outer can 14, and the opening edge of the outer can 14 is curled so as to press against the shoulder of the positive electrode can 10a. That is, in this battery assembly, two button-shaped unit cells 10 and 12 are connected in parallel, the outer can 14 serves as a positive terminal, and the negative terminal plate 10b serves as a negative terminal. The assembled battery of the present invention, in which two unit cells 10, 12 are connected in parallel, is connected to one conventional button-type battery with approximately the same outer diameter (i.e., the height of the unit cells 10, 12 is (1 battery doubled approximately)
compared with. First, the table below shows the results of examining the short circuit currents of the assembled battery of the present invention and the conventional button type battery.

[Table] The above table shows the average value of 10 batteries each, and as it is clear from this table, the combined battery according to the present invention has more than twice the capacity as the conventional button type battery of the same volume. A huge short circuit current can be extracted. FIG. 3 shows the results of examining the high load characteristics of the battery assembly of the present invention and a single conventional button battery of the same volume. As is clear from this figure, in the case of 2.0 volt termination, the battery of the present invention is 3.3% higher than the conventional battery.
More than twice as much discharge is possible. FIG. 4 shows the results of examining the low-temperature pulse discharge characteristics of the assembled battery of the present invention and a single conventional button-type battery with the same volume. As it is clear from this figure, 5mA
After 10 seconds of pulse discharge at
However, the battery of this invention maintains a voltage of 2.0 volts or more, and has excellent low-temperature discharge performance. <<Effects of the invention>> As explained in detail above, according to the assembled battery of this invention, button-shaped batteries, which are mass-produced at low cost, are used as unit cells, and short-circuit current, high-load discharge performance, and low-temperature discharge performance are improved. Excellent batteries can be easily realized.

[Brief explanation of the drawing]

Figure 1 is a block diagram of an assembled battery according to an embodiment of this invention, Figure 2 is an enlarged sectional view of the lead plate in Figure 1, and Figure 3 shows the high load characteristics of the battery of this invention and a conventional battery. The figure shown in FIG. 4 is a diagram showing the low temperature pulse characteristics of the battery of the present invention and the conventional battery. 10, 12...button cell, 10a, 12
a...Positive electrode can, 10b, 12b...Negative electrode terminal plate,
14...Outer can, 16...Insulating sheet, 18...
Lead plate (conductor), 20... Insulation coating, A, B
...Spot welding points.

Claims (1)

[Scope of utility model registration request] Positive electrode cans 10a, 12a and negative electrode terminal plates 10b, 1
2b, a plurality of button-shaped unit cells 10, 12 each having a positive electrode, a separator, and a negative electrode arranged in a stacked manner with a sealing gasket interposed therebetween, and a bottomed cylindrical metal battery containing these unit cells in a stacked manner. In an assembled battery consisting of an outer can 14, the positive electrode cans 10a, 12a of a plurality of button-shaped unit cells 10, 12 are stacked with their bottom surfaces joined to each other, and the peripheral surface of the positive electrode can is attached to the outer can 14. Spot weld each unit cell 1
The negative terminal plates 10b and 12b of 0 and 12 are connected to each other by a predetermined conductor 18 while being insulated from the outer can via an insulating sheet 16, and the negative terminal plate 10b of the uppermost unit cell 10 is The above outer can 14
An assembled battery characterized by being exposed through the opening of the battery.