JPH0112378Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention involves welding and fixing a metal sealing lid to the opening of an exterior can that also serves as a unipolar terminal and housing a power generation element, and a through-hole formed in the sealing lid. This invention relates to a battery having a structure in which a T-shaped other terminal member is penetrated and fixed through an insulating packing.

(B) Prior art As shown in Fig. 1, the structure of a conventional battery is that positive and negative electrodes 2, 3 and a separator 4 are housed inside an outer case 1 which also serves as a positive electrode terminal, and a metal sealing lid 5 is attached to the opening of the case 1 by, for example, laser welding. While fixing by welding, a T is inserted through the insulating packing 6 into the through hole formed in the sealing lid 5.
It has a structure that allows the lower end of the negative electrode terminal member 7 to be crushed into the recess of the washer 8. Note that 9 is a positive electrode current collector, and 10 is an insulating member.

As the range of use of batteries with this type of structure expands, there is an increasing demand for increasing the diameter of the head of the negative electrode terminal member, and therefore, as shown in FIG. A structure has been proposed in which the lower end of the negative electrode terminal member 17 is crushed and fixed in the recess of the washer 8.
Since the contact area between the head of the negative electrode terminal member 17 and the insulating packing 6 becomes larger, the tightening force is dispersed, and the adhesion between the head of the negative electrode terminal member 17 and the insulating packing 6 decreases, causing leakage from inside the battery. Alternatively, there is a concern that inconveniences may occur if moisture from the outside air intrudes into the battery. Particularly when this structure is applied to a non-aqueous battery, since the negative electrode is made of a substance such as lithium that is highly reactive with moisture, moisture from the outside air entering the battery will deteriorate the battery characteristics.

(c) Purpose of the invention The present invention aims to improve the adhesion between the head of the T-shaped negative electrode terminal member and the insulating packing even when the diameter of the head of the T-shaped negative electrode terminal member is increased, thereby suppressing the above-mentioned disadvantages of the conventional structure. With the goal.

(d) Structure of the invention The invention was made to achieve the above object, and its gist is to provide an outer can, a power generation element, a metal sealing lid, an insulating packing, and a terminal member of other polarity. , and a washer, wherein the outer can also serves as a unipolar terminal, the power generation element includes a positive electrode, a negative electrode, and a separator, the sealing lid has a through hole, and the packing has a The other polarity terminal member extends on the upper and lower surfaces of the sealing lid around the through hole and the through hole, and the other polarity terminal member has a T-shaped cross section having a head and a strut, and has a T-shaped cross section on the strut side of the head. A step is provided to form a small diameter portion, the sealing lid is welded to the outer can, the power generating element is housed in the outer can, and the support column is attached to the packing. The small diameter portion is in contact with an insulating packing located on the upper surface of the sealing lid, and the washer is fitted to the lower end of the support column. In the battery, the lower end of the support column is crushed in a recess of the washer and is in contact with the negative electrode.

(e) Examples An embodiment of the present invention will be described in detail below.

In the battery of the present invention shown in FIG. 3, the T-shaped negative electrode terminal member 27 has a head X and a strut Y, and a step Z on the strut side of the head as shown in FIG.
is provided to constitute a small-diameter portion 27', and the small-diameter portion 27' is configured to abut against the insulating packing 6. In FIG. 3, the same figure numbers as in FIG. 1 indicate the same elements, and their explanation will be omitted.

Further, FIG. 5 shows another embodiment of the present invention, and FIG.
The difference from the figure is that the head of the T-shaped negative electrode terminal member 37 is stepped and has a small diameter part 37' that comes into contact with the insulating packing 6. Inserting annular projection 3
7'' is provided.

(f) Effects of the invention According to the battery structure of the invention, a step is provided at the head of the T-shaped terminal member so that the small diameter part comes into contact with the insulating packing, so that the T-shaped terminal member has a step as shown in FIG. Even if the diameter of the head of the T-shaped terminal member is increased, the diameter of the head in contact with the insulating packing becomes smaller, so the tightening force of the T-shaped terminal member is not dispersed as in the battery structure shown in Fig. 1, and the tightening force of the terminal member is increased. The head and the insulating packing are maintained in a highly adhesive state, and as a result, inconveniences such as liquid leakage from inside the battery or moisture in the outside air entering the battery are eliminated.

Further, as shown in FIG. 5, it is advantageous to form a protrusion that bites into the insulating packing in the small diameter portion formed on the head of the T-shaped terminal member to further improve the adhesion.

[Brief explanation of drawings]

FIGS. 1 and 2 show longitudinal cross-sectional views of a battery that is the premise of the present invention. FIG. 3 is a longitudinal cross-sectional view of a battery according to one embodiment of the present invention, FIG. 4 is an enlarged perspective view of a T-shaped terminal member, and FIG. 5 is a longitudinal cross-sectional view of a battery according to another embodiment of the present invention. . 1...Exterior can (unipolar terminal), 2...Positive electrode, 3
... Negative electrode, 4 ... Separator, 5 ... Sealing lid, 6
... Insulation packing, 27, 37 ... T-shaped terminal member (other polarity terminal), 27', 37' ... Small diameter part,
37″...protrusion, 8...washia.

Claims (1)

[Scope of claim for utility model registration] Exterior can 1, power generation element, metal sealing lid 5,
Insulating packing 6 and other polarity terminal members 27, 3
7 and a washer 8, the outer can 1 also serves as a unipolar terminal, the power generation element consists of positive and negative electrodes 2 and 3, and a separator 4, and the sealing lid 5 has a through hole. The packing 6 extends on the upper and lower surfaces of the sealing lid around the through hole and the through hole of the sealing lid 5, and the other polarity terminal members 27 and 37 are connected to the head x and the support Y. It has a T-shaped cross section with
37', the sealing lid 5 is welded to the outer can 1, the power generating element is housed in the outer can 1, and the support section X supports the packing 6. The small diameter portions 27' and 37' are in contact with the insulating packing 6 located on the upper surface of the sealing lid, and the washer 8 is located at the lower end of the support column. A battery, wherein the lower end of the support column is crushed in a recess of the washer 8 and is in contact with the negative electrode 3. The battery according to claim 1, wherein the small diameter portion 37' has a protrusion 37'', and the protrusion 37'' bites into the insulating packing 6.