JPS6059667A - Manufacture of wound electrode - Google Patents

Abstract

PURPOSE:To prevent contact of a lithium negative plate with a winding core and increase mechanical strength of a starting part of winding to easily insert into a groove of the winding core by folding the extended part of a current collecting part which is press-bonded to a lithium negative plate and holding the end of a positive plate with a separator interposed. CONSTITUTION:A negative plate 10 consists of a lithium plate on one side of which a negative current collecting plate 11 is press-bonded. One end of the current collecting plate 10 is extended from the negative plate 10 to form an extended part 11'. A positive plate 12 consists of manganese dioxide which is main active material and is covered with a bag-shaped separator 13 whose both ends are opened, but the starting end of winding is drawn by length l within the separator 13. After stacking negative and positive plates 10 and 12, the extended part 11' of the current collecting plate 11 is folded and holds the end of the positive plate 12 with a separator 13 interposed. The holding part of plate group is inserted into a groove 15 of winding core 14, then the core 14 is turned to form a wound electrode.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a method for manufacturing a spiral electrode body which can be wound around a negative electrode plate made of a lithium plate, a positive electrode plate, and a T-separator.

(b) Prior art Conventional manufacturing method TX: m % To explain in detail with reference to Figure 3 to Box 3, first, a bag-shaped separator il+ as shown in Figure 1 is manufactured.
The first method involves preparing a positive electrode plate (21) coated with a lithium negative electrode plate (21) and a lithium negative electrode plate (4) with a current collector plate (3) crimped on the negative side. 4) into the groove (6) of the core (5) and insert the negative electrode plate (41) into the groove (6) of the core (5).
There is a method in which a positive electrode plate (2) coated with a separator 11.1 is attached to the core 11.1, and the winding core 15) is wound.

In this case, it has been found that there is a particular problem because the negative electrode plate (4) is made of a lithium plate. In other words, since lithium has the property of sticking to other metals when it comes into contact with other metals, if the winding fails using the method shown in Figure 2, the winding core (5) and the lithium negative electrode plate (4) will stick together, resulting in the winding of the L+ electrode plate. After removal, it becomes difficult or impossible to pull out the core (5).

The second method is to use a lithium negative electrode plate (
4) and the bag-shaped separator 11) (covered with the positive electrode plate (
There is a method of aligning the tip ends with the core (5) and simultaneously inserting the core (5) into the groove (6) and winding the core (51).

In this case, the positive electrode plate 12) is generally coated with an active material such as manganese dioxide or carbon fluoride on the positive electrode plate core and dried, causing the active material to fall off, especially at the beginning of the winding, which has a small radius. There is a concern that it may cause an internal short circuit. Also, the groove of the winding core (5) (
6) The work of inserting a non-self-supporting separator Ill As the size increases, the ticket cost becomes impossible, so the tips of the positive and negative electrode plates must be aligned by a high degree.

(c) Purpose of the invention The purpose of the present invention is to solve the above-mentioned problems in the conventional method.

(d) Structure of the Invention The present invention provides a positive electrode plate in which one end of a negative electrode current collector plate crimped to one side of a negative electrode plate made of a lithium plate is extended from the negative electrode plate, and the extended portion is folded back and attached to the negative electrode plate. A method of manufacturing a spiral electrode body is characterized in that the spiral electrode body is clamped via an end confinerator, and the clamping part is inserted into a groove of a winding core and wound.

According to the present invention, the extension of the current collector plate crimped onto the lithium negative electrode plate is folded back and held between the separator tabs at the end of the positive electrode plate, so that the lithium negative electrode plate and the winding core do not come into contact with each other, and the separator 2.The strength at the beginning of the winding is improved, making it easier to insert the winding core into the groove.Furthermore, since the end of the positive electrode plate is protected by a current collector plate, the positive electrode active material does not fall off and the positive electrode plate collapses. This has the advantage of being suppressed.

(E) Examples Hereinafter, nine examples of the method of the present invention will be described in detail with reference to FIGS. 4 to 2.

FIG. 4 shows a perspective view of the positive and negative electrode plates, where the negative electrode plate (10) is made of a lithium plate and has a negative electrode current collector plate f+ 117 on one side thereof.
5E is crimped and one end of the current collector plate is extended from the negative electrode plate to form an extension portion U. The positive electrode plate (+21) is made of manganese dioxide 7 active material and is covered with a bag-shaped separator T131 with both ends open, and the starting end of the positive electrode plate enters into the separator [131] by about 1,000 liters.

Next, after stacking these positive and negative electrode plates, as shown in FIG.
The end of Z separator T13Y valve and clamp? #do. At this point, the strength of the winding start of the electrode group is improved, and the surplus part of the winding start of the bag-shaped separator [131] is an extension of the current collecting number J (I
Since the clamping pressure in I) closes the opening part, the active material is prevented from coming out even if the positive electrode plate collapses to some extent.

Thereafter, the clamping portion at the tip of the electrode group shown in FIG.

(f) Effects of the invention As mentioned above, the method for manufacturing a spiral electrode body according to the present invention [I
One end of the negative electrode current collector plate crimped to one side of the negative electrode plate made of J tium plate is extended from the negative electrode plate, and the extended portion is completely folded back and attached to the negative electrode plate through the end Z of the positive electrode plate and the separator Z. Since the lithium negative electrode plate and the winding core do not come into contact with each other, the core can be easily pulled out after the winding operation is completed. Also, since it is integrated with the non-self-supporting separator Z electrode group, the strength of the winding start part is improved and the winding core can be easily inserted into the groove. Furthermore, since the end portion of the positive electrode plate is protected by the current collector plate, various advantages such as being able to suppress collapse of the positive electrode plate due to falling off of the positive electrode active material are achieved.

[Brief explanation of drawings]

FIGS. 1 to 3 relate to a conventional example, with FIG. 1 being a perspective view of positive and negative electrode plates, and FIGS. 2 and 3 showing a conventional winding process. 4 to 6 are a perspective view of the positive and negative electrode plates, FIG. 5 is a perspective view of the positive and negative electrode plates, FIG. 5 is a diagram showing the state in which the positive and negative electrode plates are stacked, and FIG. 6 is a diagram showing the winding process. 11 (t... Lithium negative electrode plate, 11]l... Negative electrode collection'
Raw board, un...extension part, (1 piece...positive electrode plate, u3
...Bag-shaped separator, (1 pole...Winling core, 115I...
·groove. Figure 1 Figure 2 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 1 /

Claims (1)

[Claims] ■ A -@χ negative electrode plate of a negative electrode collection plate crimped to one side of a negative electrode plate made of a lithium plate, the extended portion is folded back, and the end of the positive electrode plate attached to the negative electrode plate is attached to the separator. 1. A method for manufacturing a spiral electrode body, comprising the steps of: clamping the electrode body through the core, inserting the clamping part into a groove of a winding core, and winding the core.