JPS6358764A - Nonaqueous solvent battery - Google Patents

Abstract

PURPOSE:To prevent internal short-circuit in assembly process and to minimize IR drop in high rate discharge by using a porous plate such as expanded metal in which the whole periphery is or the upper and lower ends are formed in a plate as a positive current collector. CONSTITUTION:In a porous plate such as expanded metal, metal mesh, and etched metal, burrs in the periphery 2b are eliminated and the generation of internal short-circuit caused by vibration or shock in the assembly or after assembly is prevented. The electric resistance between A' and C' is actually similar to that between D and C' because of the plate-like periphery. Therefore, IR drop in the whole positive electrode 3 is decreased and sharp voltage drop in high rate discharge is decreased and the good working voltage of a battery can be obtained.

Description

[Detailed description of the invention] Industrial applications The present invention is directed to non-aqueous solvent batteries.

Conventional technology and its rf! Problem Ii: Non-aqueous solvent batteries, specifically sulfuryl chloride lithium batteries or thionyl chloride lithium batteries, have high output,
It has excellent properties such as high energy bitter melon and good storage performance.

Generally, expanded metal, metal mesh, or the like is used for the positive electrode current collector of these batteries.

However, the mechanical V-spant metal and metal mesh are
Since there are burrs, burrs, etc. on the outer periphery, these can penetrate the separator, causing an internal short circuit when assembling the battery. Even if no internal short circuit occurs at this point, this is 1! The vibrations that the battery receives are caused by cracks, burrs, etc. on the outer periphery of the electric body! The possibility of causing an internal χ0 circuit due to an external action such as a li strike is much larger than 1t.

Further, a lead tab 1 is provided on the current collector to take out a current to the outside (see FIG. 2). In particular, the positive electrode of a battery that has a spiral structure in which each electrode plate is strip-shaped is so long that the installation of the lead tab is difficult due to its length. becomes.

In the conventional J4° spand metal and metal mesh, the U* configuration is metallic, so the electrical resistance between AC and ΔB shown in Figure 2 becomes zero (0), which captures the entire positive electrode. and the corresponding IR drop (resistance overcurrent Jf)
becomes more human. This] Jl! What about elephants? During 3-rate discharge,
Significant impact on battery operating voltage 5! , and the operating voltage decreases in proportion to the tll current. Further, the utilization rate of the porous carbon body varies depending on the location. In order to solve this problem, it is possible to reduce the IR drop by increasing the number of lead tabs and making the distance between the tabs λ0, but it is possible to reduce the IR drop by increasing the number of lead tabs and making the distance between the tabs λ0. The number increases accordingly, resulting in complicated assembly, generation of defective batteries, and occurrence of internal short circuits due to contact with the f'' quadrupole terminal.

Means for Solving the Problems In view of the above-mentioned shortcomings of the prior art, the present invention 4 improves the positive electrode current collector so that the battery is not affected by external effects such as photography or impact during battery assembly or during assembly. It prevents internal short circuits and minimizes IR drop during high-rate discharge, provides higher battery life, and increases capacity by using a uniform porous carbon material, and is made of alkali light metal. Negative electrode and porous! A positive electrode whose main component is carbon 1 is disposed with a separator interposed therebetween, and a liquid At carbon material which also serves as a positive electrode active material is used.
In a non-aqueous battery containing an electrolyte mainly composed of 1-genide, the positive electrode ICm body is made of knee-spanned metal, fully bent mesh, etched metal, etc. whose entire outer periphery or upper and lower ends are plate-shaped. It is characterized by the use of a perforated plate.

This 4? 4] is also due to the porousness of the L kiss band metal board (there is no crack, force edge, etc. on its outer periphery, and it is due to external effects such as dynamic movement and impact during assembly and after assembly) No internal short circuits occur. Also, in Figure 1, the second
The electrical resistance value between A'C'', which has the same distance as shown in the figure, is practically DO Therefore, the IR drop of the entire positive electrode is small, and no significant voltage drop is observed even in the high rate TFR 115, resulting in good battery operation. 15, and the effectiveness of the reaction utilization rate of the porous carbon body at a point away from the lead tab can be measured.

Embodiment Example 1 As shown in FIG.
b, the width of the plate part is 2mm, and the total length is 4GOmm.

Lead tab 1 was spot welded to the center of a nickel etched metal cutter with a width of 45 mm to form a positive +4 TEPCO body, and Volite!・Positive electrode 3 was manufactured by filling carbon black with Rahul A roethylene as a binder.

The zero pole 4 was manufactured by using a band-shaped nickel foil as a current collector and applying 1 um to the foil. The positive VFI 3 and the negative electrode 4 were spirally wound with a separator 5 in between and housed in a cylindrical bottomed m6 which also served as a spiral structure to form a battery.

After welding and integrating the battery component 7,)↑Liquid port and positive terminal 8
An electric W that doubles as a positive electrode active material? Solution 9 is 1, ;) 7yl [1△IC14 dissolved in 1-A-nyl chloride is injected,
Next, the liquid injection port/positive electrode terminal 8 was welded and sealed to form a battery as shown in FIG. 3.

Example 2 As shown in FIG. 4, a battery having the same structure as shown in FIG. 3 was manufactured using Niracle's expanded metal whose upper and lower ends were plate-shaped as the positive electrode Toden body. In this case, in contrast to the positive electrode current collector whose entire outer periphery is plate-shaped as shown in FIG. [do.

However, for a battery that has a spiral structure, the top part is much longer than the left and right side parts.
Therefore, cracks occur on the left and right sides.

Since there are relatively very few force errors, there is an extremely low possibility that electrical shocks, force lines, etc. will cause internal short circuits compared to conventional positive electrode TODEN. The production of -1-1 varnish band metal whose upper and lower ends are plate-shaped is easier than that of a positive electrode current collector whose outer periphery is plate-shaped, and is considerably advantageous in the battery manufacturing process. Also, there is no difference between Tokyo Electric Power Company and Take.

For the following reasons, a battery with a spiral structure can exhibit a greater effect than an expanded metal t whose upper and lower ends are substantially plate-shaped and a battery whose entire outer periphery is plate-shaped.

Embodiment 3 FIG. 5 shows a positive electrode plate whose circumferential portion is plate-shaped, which is used for disk-shaped H and H ponds. This uses expanded nickel metal cut to a size of 65φ as the porous portion 2a, and a thickness of 0.0mm as the outer periphery tar 2b.
It is made by spot welding a nickel plate cut to a size of 1 mm, an outer diameter of 66φ, and an inner diameter of 64φ.

In this case, a battery is formed in which the negative electrode and the positive electrode have a stacked structure with a separator interposed in between.

Comparative example Lead tab spot welded in the center, total length 460mm
, with a spiral structure similar to that shown in Figure 3, using a conventional nickel expanded metal whose outer periphery is not plate-shaped and having a width of 45 mm as the positive electrode current collector. Ili Pond was created.

The effect table of the invention shows the number of internal short-circuit failures during battery assembly in Examples 1 and 2 and the comparative example, and Figure 6 shows the Ti flow-↑G voltage characteristic diagram showing the relationship between discharge current and battery operating voltage. FIG. 7 shows a current-capacity characteristic diagram showing the relationship between discharge current and discharge capacity.

In the comparative example, the defect R1 due to internal short circuit was 25/500, whereas in Example 2 it was 21500, and in Example 1
The result was 0/500, and we were able to significantly improve the number of defects.

In the current-voltage characteristic diagram in Figure 6, the voltage drop during large current discharge is smaller in Actual Current Example 1 and Example 2 than in the comparative example, and in the current-capacity characteristic diagram in Figure 7, this is also large. The difference in capacity during current discharge was reduced by 2Σ, and the present invention improved battery fl capacity by 1:1.

[Brief explanation of drawings]

Figure 1 shows a positive electrode current collector with a spiral structure used in the battery of the present invention, Figure 2 shows a positive electrode current collector with a conventional structure, Figure 3 is a cross-sectional view of a battery with a spiral structure, and Figure 4 shows the current collector used in the present invention. Figure 5 shows a positive electrode current body for a spiral structure using an expanded metal whose upper and lower ends are plate-shaped according to the invention, and Figure 6 shows a positive electrode current body for a battery according to the present invention used in a disk-shaped battery having a laminated structure. FIG. 7 is a current-voltage characteristic diagram of a battery manufactured according to the present invention and a conventional battery, and is a comparison diagram showing the relationship between Ti current and capacity of the same battery.

Claims (1)

[Claims] A non-aqueous solvent in which a negative electrode made of an alkali light metal and a positive electrode mainly composed of a porous carbon body are arranged with a separator in between, and an electrolyte mainly composed of a liquid oxyhalide that also serves as the positive electrode active material is injected. A nonaqueous solvent battery characterized in that a porous plate made of expanded metal, metal mesh, etched metal, etc., whose entire outer periphery or upper and lower ends are plate-shaped, is used as a positive electrode current collector.