JP2964776B2 - Dry battery insulation fault detection method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting an insulation failure of a dry battery using a metal outer can with high accuracy.

[0002]

2. Description of the Related Art A positive terminal or a negative terminal and an outer can are
As the content of insulation failure that occurs in the battery manufacturing process of a dry battery having a structure insulated through the insulating layer, the heat-shrinkable vinyl chloride tube used to insulate the bipolar terminal and the outer can is torn, Electrolyte leaks into the outer can due to contact between the terminal and the outer can due to shortage of the insulation ring, resulting in insulation failure, or poor molding of the resin gasket, poor press working of the case, etc. In some cases, the terminals and the outer can conduct through the liquid, resulting in insulation failure.

[0003] When these defective products are inserted into a device or the like as a product, the battery with the poor insulation may short-circuit the battery and may not operate as a battery. The liquid may leak out of the battery, dirtying the used equipment or impairing the functions of the equipment.

Therefore, in order to extract the defective product and produce and ship a non-defective product, a defective insulating product is detected and removed in a battery manufacturing process.

As shown in FIG. 1, the conventional insulation failure detection method applies a high AC voltage between a positive electrode terminal 1 and an outer can surface 4 of a battery in contact with an indexing board 2 holding a battery and a spring guide 3. It is a mechanism for applying voltage, and a method of electrically detecting insulation failure based on the presence or absence of conduction has been adopted.

[0006]

However, there is a decorative printing film having an insulating property on the surface of the outer can, and the butting portion 5 of the outer can having the exposed metal shown in FIG. Unless it was in contact with No. 3, no defective insulation could be detected. Therefore, this method lacked reliability.

An object of the present invention is to solve such a problem and to detect defective insulation with high accuracy.

[0008]

In order to achieve the above-mentioned object, the present invention provides a terminal for contacting an outer can with a needle-like press contact terminal having a sharp tip, instead of a surface contact.
The present invention is characterized in that a decorative printed film having insulating properties on the exterior surface of a metal-encased dry battery is finely scratched so as to be hardly noticeable by visual inspection, thereby ensuring conduction with the exterior can.

[0009]

According to this method, conduction with the outer can can be ensured, so that defective insulation can be reliably detected.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to an embodiment shown in FIG.

First, a needle-shaped press contact terminal (contact probe) 7 having a sharp tip attached to a battery indexing panel 6.
Is pressed against the metal exterior surface of the battery at the insulation resistance measurement position A by the movable rotary cam 8, thereby destroying the insulating decorative coating film on the metal exterior surface.
In this state, an AC high voltage is applied to the battery outer can. If the battery is a defective insulation product as described above,
A current flows through the metal leaf spring 9 which is in contact with the positive terminal of the battery, so that a defect can be detected. FIG. 3B shows a structural diagram of the needle-shaped press contact terminal. Table 1 shows a comparison result of the insulation failure detection rate between the conventional insulation failure detection method and the insulation failure detection method according to the present invention.

[0012]

[Table 1]

As shown in Table 1, in the conventional insulation failure detection method, 100 insulation failure products were flown, and only 36 failures could be detected. However, in the insulation failure detection method according to the present invention, 100 insulation failures were detected. did.

[0014]

As described above, according to the present invention, defective insulation of a dry battery using a metal outer can can be detected with high accuracy.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a conventional insulation failure detection method.

FIG. 2 is a diagram showing a butt portion of an outer can of a dry battery;

3A is a schematic diagram of a method for detecting insulation failure according to the present invention, and FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Positive electrode terminal of battery 2, 6 Indexing board 3 Spring guide 4 Outer can surface 5 Outer can butting part 7 Needle pressure contact terminal 8 Movable rotary cam 9 Leaf spring A Insulation resistance measurement position

──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Hidetaka Nakajima 1006 Kazuma Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. In-house (56) References Jiko 28-2729 (JP, Y1) (58) Fields investigated (Int. Cl. ⁶ , DB name) H01M 6/50

Claims (1)

(57) [Claims] An apparatus for detecting insulation failure of a dry battery using a metal outer can which is electrically insulated from a positive terminal and a negative terminal. A method for detecting the degree of continuity by applying a voltage from the terminal, wherein at least the tip of the terminal that contacts the outer can is a sharp needle-like pressure contact terminal.