JPH0329886Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Industrial application field This invention consists of a strip-shaped negative electrode plate made of light metals such as lithium and sodium, and a strip-shaped negative electrode plate made of carbon fluoride, manganese dioxide, copper oxide, iron sulfide, etc. as active materials. The present invention relates to a battery including an electrode body around which a positive electrode plate can be wound with a separator interposed therebetween.

(B) Prior art In this type of battery, light metals such as lithium and sodium can be formed into a plate shape and used as they are as the negative electrode plate, so the negative electrode current collector can be simply crimped onto any part of the negative electrode plate. It has the advantage of being able to collect current.

Here, as the negative electrode current collector, for example,
As disclosed in Japanese Patent No. 32851, a metal net is used, but in order to improve the current collecting effect, the width of the negative electrode current collector 11 made of the metal net is changed to the width of the lithium negative electrode plate 13 as shown in FIG. There is a problem in that a whisker 11a is generated from the end of the negative electrode plate 13 due to fraying of the metal mesh, and the whisker 11a comes into contact with the positive electrode, causing an internal short circuit.

In order to solve the above problems, a punched plate or an etched plate has been proposed as the negative electrode current collector 21 as shown in FIG. Since the negative electrode plate 23 is not in contact with the negative electrode plate 23, it is mainly in surface-to-surface contact with the negative electrode plate, and the bonding strength between the two is insufficient with just a simple press crimping. The more it bites into the hole 21a of the body 21, the stronger the pressing force is required and, for example, it is necessary to roll it, which poses a problem in terms of workability.

In addition, in FIGS. 3 and 4, numerals 14 and 24 are negative electrode current collector rods that also serve as winding cores.

(c) Problems to be solved by the invention The present invention has been made in view of the above-mentioned problems, and it suppresses the internal short circuit that tends to occur when a metal mesh is used as a negative electrode current collector. This improves the complexity of work when using an etching plate. Another object of the present invention is to provide a battery in which strong adhesive strength can be obtained as a negative electrode current collector and the negative electrode can be easily wound.

(d) Means for solving the problems The present invention is a non-aqueous battery having a wound electrode group, the wound electrode group having a negative electrode plate, and the negative electrode plate having a negative electrode current collector in the form of a strip. The expanded metal lath plate is resistant to non-aqueous electrolytes, is stretched in the longitudinal direction, and the short axis of the diamond-shaped holes is parallel to the longitudinal direction. A plate-shaped light metal of a negative electrode active material is crimped on one side, and a negative electrode current collector is inside the plate-shaped light metal,
It is wound so that it bites into a plate-shaped light metal.

Here, the lath plate has a large number of diamond-shaped openings arranged in a row over the entire surface, and a protrusion is formed at the hole edge of each opening.

(E) Function The lath plate as a negative electrode current collector has a connected network structure, so it does not fray and does not generate whiskers like a metal mesh, and has protrusions on the edges of the diamond-shaped holes. Because it has a three-dimensional structure, when it is crimped to the negative electrode plate, strong adhesive strength can be obtained with just a simple press crimping.

(F) Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

The negative electrode current collector 1 according to the present invention is made of a lath plate made of a non-aqueous electrolyte-resistant metal such as stainless steel or nickel, and the short axis of the diamond-shaped openings 2 of the lath plate is in the winding direction of the negative electrode plate 9. That is, it is pressed onto the inner surface of a plate-shaped light metal 3 made of lithium so as to be parallel to the direction of the arrow in FIG.

Then, a negative electrode current collector rod 4 is attached to the end of the negative electrode current collector 1, and using this negative electrode rod 4 as a winding core, a negative electrode plate 9,
The separator 5 and the positive electrode plate 6 are wound to form a wound electrode group 8 shown in FIG. 2, and this wound electrode group 8 is housed in an exterior can 7.

Although the present invention discloses a case in which a negative electrode current collector rod that also serves as a winding core is used, the present invention is not limited to this. For example, as applied to a Nickel-cadmium battery, a winding core that is extracted after forming an electrode group may be used.
It is also possible to form an electrode group.

(g) Effects of the invention As described above, the present invention is a non-aqueous battery having a wound electrode group, where the wound electrode group has a negative electrode plate, and the negative electrode plate has a band-shaped negative electrode current collector. Consisting of an expanded metal lath plate, the expanded metal lath plate is resistant to non-aqueous electrolytes and is stretched in the longitudinal direction,
The short axis of the diamond-shaped hole is parallel to the longitudinal direction, and a plate-shaped light metal of the negative electrode active material is crimped to one side of the negative electrode current collector, and the negative electrode current collector is placed inside the plate-shaped light metal. Since the lath plate is wound so as to bite into a plate-shaped light metal, the intersection points of the mesh structure of the lath plate are connected, and there is no fraying and hairs, which prevents internal short circuits. It also has a three-dimensional structure with a protrusion on the edge of the diamond-shaped hole, so when bonding to a light metal plate, strong adhesive strength can be obtained with only simple press pressure, making it easy to work. You can measure sexual improvement.

The negative electrode current collector, which is a lath plate, is arranged so that its stretching direction, ie, the left-right direction, is parallel to the longitudinal direction of the electrode plate, and is crimped to the plate-shaped light metal, so that the negative electrode current collector The bending force of the body itself is reduced, making it easier to wind.

Since the negative electrode current collector is placed on the inner surface of the light metal plate, force is applied in the direction that the negative electrode current collector bites into the negative electrode plate during winding. It is possible to suppress the separation phenomenon between the two.

As described above, the non-aqueous battery of the present invention has various effects, and its practical value is extremely large.

[Brief explanation of drawings]

Figures 1 and 2 relate to the present invention; Figure 1A is a front view of the negative electrode plate with the negative electrode current collector attached, Figure 1B is its plan view, and Figure 1C is the same as Figure 1B. FIG. 2 is an enlarged view of the main parts and a cross-sectional view of the battery of the present invention. Third
The figures relate to a conventional example; FIG. 3A is a front view of the negative electrode plate with a negative electrode current collector attached, FIG. 3B is a plan view thereof, FIG. 3C is an enlarged view of the main part of FIG. Figure 4 relates to another conventional example, where Figure 4A is a front view of the negative electrode plate with the negative electrode current collector attached, Figure 4B is a plan view thereof, and Figure 4C is an enlarged view of the main part of Figure 4B. Figures are shown respectively. 1...Negative electrode current collector made of a lath plate, 2...Rhombic hole, 3...Plate-shaped light metal (lithium), 4...
Negative electrode current collector rod, 5... Separator, 6... Positive electrode plate,
7...Exterior can, 8...Wound electrode group, 9...Negative electrode plate.

Claims (1)

[Claims for Utility Model Registration] A non-aqueous battery having a wound electrode group 8, wherein the wound electrode group 8 has a negative electrode plate 9;
The negative electrode current collector 1 is made of a strip-shaped expanded metal lath plate, and the expanded metal lath plate is resistant to non-aqueous electrolytes, is stretched in the longitudinal direction, and has diamond-shaped holes 2.
The minor axis of is parallel to the longitudinal direction,
A plate-shaped light metal 3 of a negative electrode active material is crimped onto one side of the negative electrode current collector 1, and the negative electrode current collector 1 is wound inside the plate-shaped light metal 3 so as to bite into the plate-shaped light metal 3. It is a non-aqueous battery.