JPS60202664A - Sealed type battery - Google Patents

Abstract

PURPOSE:To decrease electrical loss to increase power output by installing a plurality of output terminals in a metal cover of a sealed type battery, and electrically connecting these terminals to an anode or cathode with a plurality of connecting terminals. CONSTITUTION:An anode and a cathode are stacked with a glass fiber separator interposed between them, and they are wound around the center axis to form an electrode plate group 1. The plate group 1 is accommodated into a can 2 which also serves as an anode terminal. The can 2 is sealed with a metal cover 3a to which output terminals 5a-1 and 5a-2 are fixed with a hermetic seal 4. The terminals 5a-1 and 5a-2 are connected to equally divided portions of the cathode in the plate group 1 with connecting terminals 6a-1 and 6a-2. By this manner, a sealed type lithium-thionyl battery is fabricated. By installing a plurality of output terminals, electric loss is decreased, and discharge voltage and duration in high rate discharge are improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sealed battery that reduces electrical loss from the cathode or anode of a completely sealed battery such as a lithium battery, efficiently extracts electrical output, and improves reliability. It is something.

In general, lithium batteries that use lithium as the cathode active material and thionyl chloride or sulfuryl chloride as the anode active material have problems such as the fact that both electrode active materials dislike moisture, and that the anode active materials thionyl chloride and sulfuryl chloride have high vapor pressure. Therefore, it must be completely sealed. Therefore, after storing an electrode group consisting of a cathode, anode, porous separator, etc. in a metal storage can, it is covered with a metal lid that holds an electrical output terminal insulated through an electrically insulating material. However, a method is used to completely seal the can by laser welding the joint between the storage can and the metal lid. The electrolyte, which is a mixed solution of thionyl chloride (SOCl) and lithium aluminum tetrachloride (LiAlC14), is prepared by laser welding the joint between the storage can and the metal lid.
An appropriate amount can be supplied through a small hole in a metal lid or through a small hole in a hollow electrical output terminal. Complete airtightness is maintained by blocking the small holes after the electrolyte has been supplied. When the cathode of the electrode group is connected to the storage can, the anode is connected to the electrical output terminal, but the reverse connection method is also possible. In this case, since the conventional battery is provided with only one electrical output terminal, when the battery is discharged at a high rate, electrical loss is large and heat is generated. In addition, the connection between the electrical output terminal and, for example, an external circuit lead wire is
Since there are only two locations, if the connection comes off, the battery and external circuit will be completely cut off. Similarly, since there is only one connection between the electrical output terminal and the cathode or anode, there is no connection between the electrical output terminal and the connection terminal from the cathode or anode even after the assembly is completed. This caused problems such as stress being applied to the connection between the terminal and the electrical output terminal and the electrode group.

For example, if the cathode or anode and the electrical output terminal become disconnected in the storage can after assembly of the battery, the battery cannot be repaired.

Additionally, if the connection between the electrical output terminal and the external circuit is cut off, it can be repaired, but if the battery is used to back up the computer's memory, it will temporarily not be able to perform its function at all. .

It is a known fact that batteries have different discharge rates depending on their use, and the current drawn by a single battery ranges from microamperes for memory backup to hundreds of amperes for devices that require rotation of motors, for example. If the current drawn is less than a few hundred milliamperes, the voltage drop between the connection terminal and the electrical output terminal is very small, and depending on how it is used, there may be no practical problem. As the current increases, the voltage drop cannot be ignored.This loss is called Joule heat and is proportional to the two fluxes of current, so it is necessary to reduce the resistance of the connection terminals, electrical output terminals, and their connections as much as possible. In that sense, when a large current is drawn from a conventional battery that has only one electrical output terminal on the metal lid, the temperature locally rises due to Joule heat, which reduces the efficiency of the battery. It also causes a significant decrease in reliability.

The present invention provides a battery that solves these problems, and the details thereof will be explained next.

FIG. 1 is a cross-sectional view of a conventional lithium-thionyl chloride battery having one electrical output terminal.

Reference numeral 1 denotes an electrode group which is housed in a storage can 2. Reference numeral 3 denotes a metal lid, which is electrically insulated from the electrical output terminal 5 by a 1-metal seal 4. A connection terminal 6 from the anode of the electrode group 1 is connected to the electrical output terminal 5, and a connection terminal from the cathode is connected to the storage can 2, although not shown. 7
8 is an upper insulating plate for preventing contact between the anode of electrode group 1 and storage can 2 or metal lid 3, and 8 is a lower insulating plate for preventing contact between the anode of electrode group 1 and storage can 2. . Reference numeral 9 denotes a joint between the metal lid 3 and the storage can 2, and by laser welding this joint, complete sealing can be maintained. This type of battery uses a mixed waste water solution of lithium aluminum tetrachloride and thionyl chloride as the electrolyte.
In the manufacturing process, it is not preferable to supply the electrode group 1 after storing it in the storage can 2.

At this stage, the metal lid 3 has only been fitted into the storage can 2, and the electrolyte evaporates from the mating portion 9. Therefore, after making a small hole in the metal lid 3 in advance or using a hollow electric output terminal and laser welding the mating part 9, the electrolyte is not supplied from the small hole or the hollow electric output terminal (1
A method of quickly sealing it is taken.

FIG. 2 is a sectional view of a lithium-thionyl chloride battery according to the present invention. In this embodiment, two wires of the same polarity are attached to the metal lid 3a.
Two electrical output terminals 5a-1 and 5a-2 are provided. The shape of the battery is generally called a D type, and the diameter is approximately 34 mm.
φ, height is approximately 61mm, electrode group 1 is 46mm x 5
A 46 mm x 480 mm anode and a 46 mm x 480 mm cathode were laminated on glass fibers with a filter in between, and these were wound around the central axis. The two connecting terminals 6a-1 and 6a-2 of the same polarity were connected to the anode at positions that divided the length of the anode into three equal parts, but this position could be freely selected, and the connecting terminals 6a-1 and 6a-2 were connected to the anode at positions that divided the anode into three equal parts. The electrical output terminal 5a-1, the connection terminal 6a-2 and the electrical output terminal 5a-2 are connected. Figure 3 shows the discharge time-battery voltage characteristics when a D-type battery according to the present invention with a capacity of 10Ah is discharged at a rate of 0.5 hours. The characteristics of batteries with connection terminals are also shown. The voltage of the battery of the present invention is about 150 m compared to that of the conventional battery.
The discharge time was extended by about 20% due to the high voltage and low voltage.

As explained above, when the present invention is adopted, the battery voltage and discharge time during high rate discharge are improved, and the effect of improving the function or characteristics is large. Its industrial value is that it does not require any special technology and can be manufactured using conventional battery production processes.

It is extremely large.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a conventional lithium-thionyl chloride battery, Figure 2 is a cross-sectional view of a lithium-thionyl chloride battery according to the present invention, and Figure 3 is a sectional view of a lithium-thionyl chloride battery according to the present invention, a conventional battery, and discharge. It is a characteristic comparison curve diagram. 1 is an electrode group, 2 is a storage can, 3a is a metal lid, 4 is a hermetic seal, 5a-1, 5a-2 are electrical output terminals, 6
a-1 and 6a-2 are connecting terminals 1 patent applicant Shin-Kobe Electric Co., Ltd. Figure 1

Claims (1)

[Claims] In a battery, an electrode group consisting of a cathode, an anode, and a porous separator that insulates both electrodes is housed in a storage can, and the battery is completely sealed with a metal lid having an electrical output terminal insulated through an electrically insulating material. 1. A sealed battery characterized in that a plurality of electrical output terminals are provided on a battery cover, and the plurality of electrical output terminals and a cathode or anode are electrically connected using a plurality of connection terminals.