JPS62188164A - Battery - Google Patents

Abstract

PURPOSE:To readily and visually check the coating state of sealant in a battery assembly process by applying different color sealants to separate sealing coating portions in a batter case sealing part. CONSTITUTION:An insulating gasket 6 having an L-shaped cross section is placed between the bottom periphery 1b of a positive can 1 and the periphery 5a of a negative terminal plate 5. Different color sealants 7, 8 are applied to between the positive can bottom periphery 1b and the outer circumference 6a of the gasket 6 and between the negative terminal plate periphery 5a and the inner circumference 6b of the gasket respectively. Thereby, the sealant coated state in the sealant coating portions is redily and surely checked in a battery assembly process, and the manufacturing process control of the battery is made simple.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention provides a method for independently controlling the hue of the sealant used in the sealant application area of the battery case sealing part in button-shaped, coin-shaped, or cylindrical batteries. This relates to a battery that is easy to manufacture by changing the coating for each product.

<Prior art> The above-mentioned batteries generally have a structure in which a synthetic resin insulating gasket is squeezed between a battery can housing a power generation element and a terminal plate provided at the opening of the battery can to seal the battery case. It is taken. This type of battery, such as a button-type alkaline battery, has a high degree of leakage due to creep of the alkaline electrolyte in the power generation element, and in the case of a coin-type non-aqueous electrolyte battery, the insulating gasket and battery can Moisture in the outside air that enters the battery through the fine gaps that exist at the contact surface with the terminal board reacts with the negative electrode active materials such as lithium and sodium, which tends to cause deterioration of battery performance. . For this reason, in these batteries, the contact surface between the outer circumferential surface of the insulating gasket 1 and the battery field surface, the contact surface between the inner circumferential surface of the insulating gasket and the peripheral edge of the terminal plate, etc., which are necessary routes for liquid leakage or external air intrusion, etc. A viscous semi-solid material such as polybdenum, a viscous material containing an uncured epoxy resin, or pitch is applied and interposed as a sealant to improve the sealing properties of these contact surfaces.

<Problems to be Solved by the Invention> By the way, in the battery manufacturing process, such a sealant is injected into the vortex portion of the insulating gasket 1- on which the terminal plate periphery is placed, or the bottom periphery of the battery can, etc., in the form of a syringe needle. When injecting and applying with a nozzle, etc., these sealants have a high viscosity and are difficult to inject and apply. However, it is still insufficient and there is still a problem that leakage and performance deterioration due to poor coating still occur.

Therefore, by adding pigments and dyes as colorants to the sealant, defects in sealant application can be easily visually confirmed from the outside during the battery manufacturing process, such as after applying the sealant, assembling batteries, or crimping battery cans. Although methods are used to facilitate process control by making it possible to check, conventionally, sealants containing colorants of the same hue are used for all battery sealant types. Therefore, the sealant application state for each sealant application area is unknown, making it easy to overlook some coating defects and making it difficult to deal with coating defects in each application area.

<Means for Solving the Problems> The battery of the present invention is a battery in which the battery case is sealed by compressing the insulating gaskets 1 to 1 between the battery can and the terminal board, and the battery case has an independent sealing section. The gist is that sealants of different hues are used in the sealant application areas.

As mentioned above, the hue of the sealant does not differ because of the coloring that is added to each sealant used in each sealant application area. This can be easily done by simply changing the VI to a different hue.

In addition, the colorant to be used must be a dye or pigment that is stable and inert to the sealant itself, the electrolyte, and the active material, and is not subject to deterioration or decomposition even after long-term storage. Not done.

<Function> By using the above means, the state of application of the sealant in each sealant application area can be easily checked from the outside in the battery assembly process.

<Example> Hereinafter, the present invention will be described in detail using a coin-shaped lithium battery shown in the accompanying drawings.

In FIGS. 1(^) and (B), a coin-shaped positive electrode mixture 2 is placed on the bottom surface 1a of a bottomed short cylindrical positive electrode can 1. A lithium negative electrode 4 crimped to a negative electrode terminal plate 5 is opposed to the upper surface with a separator 3 interposed therebetween.

Further, an insulating gasket 6 made of synthetic resin and having an annular cross-section and an oval shape is sandwiched between the bottom peripheral edge 1b of the positive electrode can 1 and the peripheral edge 5a of the negative electrode terminal plate 5.

On the other hand, the bottom peripheral edge of the positive electrode can and the outer peripheral surface 6 of the insulating gasket 6
a, and between the peripheral edge of the negative electrode terminal plate and the insulating gasket 1-6
Sealing agents 7 and 8 having different hues are applied between the inner circumferential surface 6b and the inner circumferential surface 6b, respectively. These sealants 7.8
For example, polybdenum (transparent) is used as the main material, and an appropriate dye or @ material is added thereto before coloring. Such coloring agents include, for example, black coloring agents such as black printing ink, red coloring agents such as oil red red colorant, orange coloring agents such as oil orange and pyrazolone orange, or oil coloring agents. Examples include yellow coloring agents such as yellow and benzidine yellow.

In addition, this type of coloring agent does not change over time and does not react with each material in the battery, and furthermore, when adding the coloring agent to sealants 7 and 8, it is 1 to 2 times thicker than the sealant. % is sufficient, and therefore, it can be said that there is no deterioration in sealing performance due to the addition of the colorant.

Such sealant 7.8 is used in the battery manufacturing process.
Prior to battery combination, the inner peripheral surface 6 of the insulating gasket 1-6
It is applied in an annular manner to the groove part b and the peripheral edge part 1b of the bottom surface of the positive electrode can 1 by injecting it from a needle-shaped nozzle, etc., and the assembly and crimping of the positive electrode can are performed.
Checking the application status of each of these sealants 7 and 8 is as follows:
This must be done easily and visually from the outside, not only during application, but also in the battery assembled state shown in Figure 1 (A) and in the assembled state shown in Figure 1 (B) after the positive electrode can is crimped. It is clear that it can be done.

In addition, although the example in which the present invention is applied to a coin-shaped lithium battery has been shown above, it goes without saying that the present invention can be similarly applied to a cylindrical alkaline battery, a button-shaped alkaline battery, and the like.

<Effects of the Invention> According to the battery of the present invention configured as described above, it is possible to easily and reliably check the sealant application status for each sealant application part in the battery assembly process by visual confirmation, thereby improving battery manufacturing process management. This has the effect of making it easier to manufacture, and in particular, the pressure contact area between the insulating gasket 1 and the battery can is small, so the state of sealant application has a large effect on battery sealing performance. The present invention is particularly effective when applied to flat batteries such as coin-shaped or button-shaped batteries that provide .

[Brief explanation of drawings]

FIG. 1(^) is a sectional view showing the assembled state of the battery according to the embodiment of the present invention, and FIG. 1(13) is a sectional view similarly showing the state after the positive electrode can is crimped. DESCRIPTION OF SYMBOLS 1...Positive electrode can, 5...Negative electrode terminal plate, 6...Insulating gasket, 7, 8...Sealant, 1b...Bottom periphery, 5a...Periphery, 6a... Outer peripheral surface, 6b...
Inner peripheral surface.

Claims (1)

[Scope of Claims] 1. In a battery whose battery case is sealed by sandwiching an insulating gasket between a battery can and a terminal board, seals of different colors are applied to independent sealant application areas of the battery case sealing part. A battery characterized by using a chemical agent. 2. Sandwich an insulating gasket with a roughly L-shaped cross section between the periphery of the bottom of the battery can and the periphery of the terminal plate, bend the opening of the battery can inward, and tighten the insulating packing from the outside to close the battery case. Claim 1: A sealed battery, characterized in that the area between the battery can and the insulating gasket and the area between the terminal plate and the insulating gasket are each provided with an independent sealing agent coating area. Batteries listed.