JPH09283102A - Coin battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coin battery having a power generation element which is fluid-tightly sealed by a positive electrode casing, a sealing plate and a gasket, and to improve the leakage resistance of the coin battery without breaking a gasket by regulating the compression of a gasket at three points. SOLUTION: The compression A of a gasket between a sealing plate and a positive electrode casing end part is regulated to 60 to 80%. The compression B of the gasket between a sealing plate end part and a positive electrode casing is regulated to 50 to 70%. The compression C for the gasket between the positive electrode casing and a U-shaped return end part of the sealing plate is regulated to 40 to 60%. If the order of magnitude of these compression is A, B, and C, the leakage of fluid can be prevented to ensure excellent performance without breaking the gasket.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coin type battery in which a power generating element is liquid-tightly sealed by a positive electrode case, a sealing plate and an insulating gasket.

[0002]

2. Description of the Related Art Conventionally, in a coin type battery, as shown in FIG. 1, the compressibility B of the gasket between the tip of the sealing plate and the positive electrode case is 50 to 80%, and the U-shaped folded tip of the sealing plate. The compressibility C of the gasket between the positive electrode case and the positive electrode case is set to 40 to 60%, and the compressibility A of the gasket between the tip of the positive electrode case and the sealing plate is not considered.

[0003]

However, if the compressibility of the insulating gasket between the tip of the sealing plate and the positive electrode case is set to 50% as described above, liquid leakage may occur due to secular change of the insulating gasket. It was Further, in order to improve the liquid leakage resistance, the compressibility B was set to 80%, but there was a problem that the insulating gasket was broken.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a coin-type battery having excellent liquid leakage resistance.

[0005]

In order to achieve the above object, the present invention has a gasket compressibility A between the tip of the positive electrode case and the sealing plate of 60 to 80%, the tip of the sealing plate and the positive electrode case. The compression ratio B of the gasket between
0 to 70%, the compressibility C of the gasket between the U-shaped folded tip of the sealing plate and the positive electrode case is 40 to 60%
The configuration is as follows.

Further, the respective compression rates are the compression rate of the gasket between the tip of the positive electrode case and the sealing plate, the compression rate of the gasket between the tip of the sealing plate and the positive electrode case, and the U-shaped folded tip of the sealing plate. The compression rate of the gasket between the portion and the positive electrode case is reduced in this order.

[0007]

Embodiments of the present invention will be described.
By controlling the compressibility of the insulating gasket at 3 points as shown in FIG. 1, the liquid leakage resistance is improved as compared with the conventional case of controlling the compressibility at 2 points. The compression ratio C of the insulating gasket between the U-shaped folded-back tip portion of the sealing plate and the positive electrode case is 40 to 60% except when the compression ratio C is 40 to 60%. 60
It was fixed as%. Conventionally, in order to improve the resistance to liquid leakage, the compression rate B of the gasket between the tip of the sealing plate and the positive electrode case is 80%. However, if the compression rate B is 80%, the gap between the tip of the positive electrode case and the sealing plate is set. The insulating gasket of No. 2 stretched, the compressibility A of the insulating gasket between the tip of the positive electrode case and the sealing plate became 90% or more, and the gasket was broken. Therefore, first, by setting the compressibility A of the gasket between the positive electrode case tip and the sealing plate to 60 to 80%, the expansion of the gasket between the positive electrode case front end and the sealing plate is suppressed, so that the sealing plate tip and the positive electrode case Even if the compressibility B of the gasket between 50 and 70% is set, the liquid leakage resistance can be improved. Therefore, if the compression rate of the sealing is managed at 3 points, rather than compressing at 2 points,
Since the liquid leakage resistance is improved and the compression rate does not reach the limit, it is easy to create a sealed state that maintains stable quality without worrying about gasket breakage.

[0008]

EXAMPLE A coin-type lithium primary battery (CR2032, diameter 20.0 mm, thickness 3.
15 mm) will be described with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a material having a U-shaped folded-back portion and a plate thickness of stainless steel with nickel on one side of 0.2.
A 2 mm sealing plate, 2 is a positive electrode case made of stainless steel with nickel on one side having a plate thickness of 0.2 mm, and 3 is a gasket made of polyophine resin such as polyethylene and polypropylene (in this embodiment, polypropylene is 0.36 mm is used), 4 is a separator made of polypropylene nonwoven fabric, 5 is a positive electrode using manganese dioxide as an active material, 6 is a negative electrode using lithium as an active material, and the electrolyte is P
The solvent is C: DME = 2: 1 and the solvent is 1 / 2M LiClO ₄ . The compression rate A of the gasket between the tip of the positive electrode case and the sealing plate is the first point, the compression rate B of the gasket between the tip of the sealing plate and the positive case is the second point, and the U-shaped folded tip of the sealing plate. The compressibility C of the gasket between
If the points are, the first point is 30 to 90%, the second
30-90% points, 40-60% third points
Instead, configure 50 batteries, 60 ℃ for 1 hour and -10 ℃
The 1-hour cycle was continuously carried out for 4 weeks, and the resulting cumulative number of leaks and the occurrence of gasket breakage are shown in the table.

As can be seen from the table, when the compression rate B of the gasket between the tip of the sealing plate and the positive electrode case is 80% or more, the compression rate A of the gasket between the tip of the positive electrode case and the sealing plate is Out of place Gasket breakage occurred. That is, even if the compression rate is controlled at 3 points, good results cannot be obtained if the compression rate B of the gasket between the tip of the sealing plate and the positive electrode case is 80% or more. However, the compression rate A of the gasket between the tip of the positive electrode case and the sealing plate is 60 to 80%, and the compression rate B of the gasket between the tip of the sealing plate and the positive electrode case is 50 to 70%.
%, And the compression ratio C of the gasket between the U-shaped folded tip of the sealing plate and the positive electrode plate case is 40 to 60%, and the compression ratio is between the positive electrode case distal end and the sealing plate. It was found that when the gasket between the portion and the positive electrode case and the gasket between the U-shaped folded back tip of the sealing plate and the positive electrode case were in this order, the gasket was not broken and the liquid leakage resistance was excellent.

[0011]

[Table 1]

[0012]

[Table 2]

[0013]

[Table 3]

As is clear from this table, the compressibility C of the gasket between the U-shaped folded tip of the sealing plate and the positive electrode case is fixed at 40 to 60%, and the positive electrode case distal end and the sealing plate are fixed. The compression rate A of the gasket between 6
0 to 80%, the compressibility B of the gasket between the tip of the sealing plate and the positive electrode case is set to 50 to 70%, and the respective compression rates are set between the gasket and the seal between the positive electrode case distal end and the sealing plate. If the gasket between the plate tip and the positive electrode case and the gasket between the U-shaped folded tip of the sealing plate and the positive electrode case are arranged in this order,
It is possible to prevent liquid leakage and ensure an excellent effect without gasket breakage. Although the coin-type lithium primary battery is described in this embodiment, other coin-type batteries and coin-type lithium secondary batteries may be used.

[0015]

As described above, if the compressibility of the sealing port is controlled by the three points of the insulating gasket, the liquid leakage resistance can be improved.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of an organic electrolyte battery of the present invention.

[Explanation of symbols]

 1 Sealing Plate 2 Positive Electrode Case 3 Gasket 4 Separator 5 Positive Electrode 6 Negative Electrode

Claims (2)

[Claims] 1. A sealing plate having a U-shaped folded portion on its periphery, a cylindrical positive electrode case having a bottom, and an insulating gasket interposed between the positive electrode case and the sealing plate, and the positive electrode case opening is placed inside. In a lithium battery in which the power generation element is tightly sealed, when the compressibility of the insulating gasket between the U-shaped folded tip of the sealing plate and the positive electrode case is maintained at 40 to 60%, the positive electrode case distal end and the sealing plate are The compressibility of the insulating gasket between 60 and 80%, and the compressibility of the insulating gasket between the end of the sealing plate and the positive electrode case is 5%.
A coin-type battery that holds 0 to 70%. 2. The compressibility of the insulating gasket between the tip of the positive electrode case and the sealing plate, the compressibility of the insulating gasket between the tip of the sealing plate and the positive electrode case, and the U-shape of the sealing plate. The coin-shaped battery according to claim 1, wherein the compressibility of the insulating gasket between the folded back tip portion and the positive electrode case is reduced in order.