JPS59132558A - Battery - Google Patents

Abstract

PURPOSE:To prevent any leakage of the electrolyte of a battery by sealing it through a gasket after a sealing plate having a U-shaped periphery and a member which is inserted under the sealing plate to prevent any deformation of the sealing plate are attached inside the opening of a battery case. CONSTITUTION:A generation element consisting of a positive mixture 2, a separator 3 and a negative mixture 4 is installed in a battery case 1 also serving as the positive electrode of an alkaline battery or the like. Next a reverse-plate- like sealing plate 5 having a U-shaped periphery is placed inside the curved portions 1a and 1b of the upper end opening of the case 1 with a gasket 12 interposed to seal the battery. At this point, a deformation-preventing body the diameter of the upper portion of which is somewhat smaller than the inner diameter of the sealing plate 5 and the diameter of the lower portion of which is somewhat larger than that of the upper portion, is placed under the sealing plate 5 and penetrated by a current collector 6 through a soft material 9. As a result, prevention of any deformation of the sealing plate 5 which might be caused due to stress during the sealing is secured, thereby preventing any leakage and diffusion of electrolyte.

Description

[Detailed description of the invention] Industrial applications The present invention relates to an improvement in the sealing structure of a battery.

Structures of conventional examples and their problems Alkaline batteries that are generally constructed using alkaline electrolytes, such as silver oxide batteries, manganese dioxide batteries, nickel-zinc batteries, and lithium batteries that use organic electrolytes, are characterized by the characteristics of the electrolyte. If the sealing strength is weak, the built-in electrolyte will leak onto the battery terminal surface, causing corrosion of the terminal surface and damage to the equipment used.
It was extremely inconvenient. In order to solve these problems, it is urgently necessary to establish a strong sealing condition between the metal sealing plate, the metal case, and the sealing bunkering.

Conventionally, the purpose is to increase the mechanical strength of the periphery of the metal sealing plate when sealing the metal case by bending the upper end of the opening inward and pressing the sealing punch against the periphery of the metal sealing plate. Then, the peripheral edge of the sealing plate is bent in a direction almost perpendicular to the radial direction of the sealing plate and has a U-shaped cross section, and this U-shaped bending part applies a U force, and the U-shaped bending is Leak resistance was ensured by firmly attaching a backing to the tip of the part to an appropriate size. However, the materials for the sealing plate and case of this type of battery are usually stainless steel, phosphor bronze, nickel silver, or nickel steel plate with a thickness of about 0.1 to 0.6 mm.
However, these materials vary somewhat depending on their thickness, or at least their material hardness (pips).

- If a material with a hardness of 250 or higher is not used, it will easily deform due to sealing pressure. However, it is difficult to process a material with such hardness into an arbitrary shape, and in reality, materials with a hardness of about 100 to 150 are used. In this case, the sealing plate is slightly deformed due to the concentrated load during sealing. In other words, if the peripheral edge of the sealing plate is bent into a U-shaped cross section, the inner side wall of the sealing plate will shift inward as shown by the broken line in Figure 1, and as a result, the metal sealing plate, The sealing compressive strength between the sealing donkey, king, and case tends to decrease, making it difficult to achieve a satisfactory sealing condition.

Purpose of the invention This invention! ri, it is an object of the present invention to solve such conventional problems and provide a battery having a sealing structure with excellent leakage resistance.Structure of the InventionThe present invention has an inverted dish-shaped sealing whose peripheral portion is U-shaped in cross section. A nail-shaped current collector is fixed to the center of the inner surface of the plate, and a deformation prevention body is provided which contacts the inner side wall of the sealing plate to prevent inward deformation of the peripheral edge of the sealing plate. The present invention is characterized in that a through portion is provided through which the shaped current collector passes through in close contact with the current collector. Thereby, the leakage resistance of the battery sealing part can be improved.

DESCRIPTION OF EMBODIMENTS The present invention will be described below based on drawings showing embodiments thereof. In Fig. 1 and Fig. 2 a and b, 1 is a battery case made of stainless steel or iron with a layer of corrosion-resistant metal such as nickel, and the inner side is coated with manganese dioxide, which is the anode active material 2. The battery case 1 also serves as an anode terminal. 1 and 3 are cylindrical separators with a bottom that are in close contact with the inner surface of the anode active material 2. , nylon, polypropylene non-woven or woven fabric, or these materials mixed with Japanese paper, Manila hemp, cellulose, etc. Reference numeral 4 denotes a gelled cathode active material housed in the separator 3, which is composed of frozen zinc powder, a polymer gelling agent such as carboxymethyl cellulose, and an aqueous potassium solution. 5 is an inverted dish-shaped sealing plate whose peripheral edge is bent into a U-shaped cross section, and this sealing plate 5 also serves as a cathode terminal plate, 5US3.
04:5US430. It is made of materials such as titanium alloys and nickel plates that have excellent mechanical strength and extremely low solubility in mercury. Reference numeral 6 denotes a nail-shaped cathode current collector integrated into the central part of the inner surface of the sealing plate 5 by electric welding, and since this cathode current collector 6 comes into contact with zinc, it prevents the formation of local batteries. Therefore, copper electrochemically approximates the potential of zinc.

It is made of tin, copper alloy, tin alloy alone, or a metal material provided with a layer of these metals. Reference numeral 7 denotes a deformation prevention body attached to the nail-shaped current collector 6, which is in contact with the inner side wall of the sealing plate to prevent the peripheral edge of the sealing plate from deforming inward. This deformation prevention body 7 has a trapezoidal cross section, and its upper diameter φ is slightly smaller than the diameter φ2 of the inner side wall of the sealing plate 5, and its lower diameter φ3 is slightly larger than the upper diameter φ1. There is. The material of the twisted deformation prevention body 7 may be the same gold material as the material of the sealing plate 5, polyacetal,
Polyphenylene oxide, polysulfone.

Single material such as polycarbonate or carbon fiber.

Constructed using hard engineering plastic with added glass fiber, metal filler, etc.

Furthermore, these materials do not dissolve or alloy with mercury. Furthermore, a penetration part 8 is provided in the center of the deformation prevention body 7, and a recess 10 is formed in the penetration part 8 for storing a soft material 9 such as butyl rubber or chlorograne rubber, and is continuous with the recess 10. In addition, a hole 11 having a diameter φ5 equal to or slightly larger than the diameter φ4 of the current collector 6 is provided.

When fixing the trapezoidal deformation prevention body 7 to the sealing plate 5 configured as described above, the nail-shaped current collector 6 is inserted into the soft material 9 of the trapezoidal deformation prevention body 7, and then the current collector 6 is fixed. is passed through the hole 11 of the trapezoidal deformation prevention body 7, and the trapezoidal deformation prevention body 7
The entire peripheral edge of the sealing plate 5 is press-fitted and fixed to the inner side wall of the sealing plate 5. Synthetic rubber, synthetic resin, etc. having elasticity and electrical insulation properties are fitted onto the peripheral edge of the sealed current collector constructed in this way.
Alternatively, a sealing body is formed by integrating the material by molding, and the battery case 1 is inserted into the step 1a provided on the abdomen while the battery case 1 is opening, and then the opening end 1b of the battery case 1 is bent inward. The sealing panoking 12 is firmly pressed against the peripheral folded portion 5a of the sealing plate 5 to achieve an airtight seal.

By performing such sealing, the force of displacement of the inner surface side wall of the sealing plate in the inner radial direction due to the stress load on the sun is absorbed by the peripheral edge of the trapezoidal deformation prevention body 7 (thereby holding and fixing it). Deformation of the sealing plate 5 can be prevented, and as a result, an extremely good and stable sealing state can be achieved.The surface of the trapezoidal deformation prevention body 7 is lined with a highly flexible rubber or plastic material by a method such as lining. If provided, the airtightness of the seal will be even higher.

Next, in order to confirm the effect of this example, we applied the configuration of the example of the present invention to the above-mentioned manganese dioxide-zinc battery and a lithium battery using an organic electrolyte. Conventional configuration, that is, trapezoidal deformation prevention body 7
The leakage resistance was compared with those A' and B' which did not have the soft material 9. In this case, manganese dioxide battery A uses a 10 molar potassium hydroxide aqueous solution as the electrolyte, and lithium battery B uses a solution of 1 mono I/// l of lithium borate dissolved in γ-butyrolactone. was used, and ribbon-shaped lithium was used as lithium. In addition, as the material for the sealing packing, nylon 11 was used in the case of manganese dioxide batteries, and low density polyethylene was used in the case of lithium batteries. Furthermore, a butyl rubber material was used as the soft phase 9.

The following table shows the cumulative number of batteries that generate by-liquid when the above-mentioned configuration is constructed, 200 batteries each are formed, and stored in an atmosphere with a temperature of 46°C ± 3°C and a relative humidity of 80 to 90 degrees. There are many things.

Effects of the Invention As is clear from the above examples, the battery of the present invention can reliably prevent the deformation of the sealing plate due to stress during solar radiation. The diffusion of mercury from zinc chloride to the current collector surface and the diffusion of alkaline electrolyte based on the diffusion are also ensured by the strong adhesion between the soft material provided in the trapezoidal deformation prevention body and the current collector. It is preventable.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of a main part of a cylindrical alkaline manganese battery showing an embodiment of the present invention, and Fig. 2 is an exploded view of the cathode current collector in the same battery, where a is a side view and b is a side view. i7J
: A sectional view of a trapezoidal deformation prevention body. 5. Sealing plate, 6- Current collector, 7 Deformation prevention body, 8... Through) j! 1 part, 9 Soft material, 10
...Four parts, 11... Hole, 12... Seal Robano King.

Claims (4)

[Claims] (1) Due to the inward bending of the upper end of the opening of the battery case,
an inverted dish-shaped sealing plate that seals the opening of the battery case by sandwiching a peripheral edge portion having a U-shaped cross section through a sealing cup;
The sealing plate includes a nail-shaped current collector fixed to the center of the inner surface of the sealing plate, and a deformation prevention body that is in contact with the inner side wall of the sealing plate and prevents the peripheral edge of the sealing plate from deforming inward. A battery characterized in that the body is provided with a through portion through which the nail-like current collector passes through in close contact with the body. (2) The deformation prevention body has an upper diameter slightly smaller than the diameter of the inner side wall portion of the sealing plate, and a lower diameter slightly larger than the upper diameter to have a trapezoidal cross section. Batteries listed in section. (3) The penetration part of the deformation prevention body is provided with a hole having a diameter equal to or slightly larger than the diameter of the nail-shaped current collector, and a recessed part for storing a soft material having backing properties. A battery according to scope 1. (4) The battery according to claim 3, wherein the current collector and the soft material are tightly fixed by piercing the nail-shaped current collector of the sealing plate into the soft material.