JPH0455414Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field This invention closes the opening of the battery case housing the electrode body with a sealing lid via insulating packing, and also closes the opening of the battery case housing the electrode body with a sealing lid, and also closes the opening of the battery case housing the electrode body with a sealing lid. This invention relates to a cylindrical battery having a structure in which an insulating member is disposed in the cylindrical battery.

(B) Prior art The purpose of the insulating member placed between the top surface of the electrode body and the sealing lid is to connect the lead extending from one electrode to the other electrode or the terminal of the other pole on the top surface of the electrode body. The purpose is to prevent internal short circuits caused by contact with the battery case, which also serves as a battery case, and to prevent vibration of the electrode body within the battery case. An annular insulating member having an inner circumferential wall has been proposed.

(c) Problems to be solved by the invention The conventional structure shown in FIG. 3 does not provide sufficient effects in preventing internal short circuits and vibration of the electrode body. Furthermore, although the conventional structure shown in Fig. 4 is effective in preventing internal short circuits caused by contact between the lead and the battery case and in preventing vibration of the electrode body, the problem is caused by contact between the lead and the top surface of the electrode body. There is a concern that an internal short circuit may occur. This phenomenon occurs because the lead is longer than necessary to facilitate spot welding of the tip of the lead to the sealing lid.
This is because when the battery is sealed after spot welding, the excess length of the lead will fall down to the top surface of the electrode body and come into contact with it.

The present invention solves the above-mentioned conventional problems by improving the structure of the insulating member.

(d) Means for solving the problem The insulating member is an annular body having a lead insertion hole, and a bridge portion is formed in the insertion hole, and the thickness of the bridge portion is greater than the thickness of the insulating member. Use a thin one.

(E) Effect According to the present invention, the leads are supported by the bridge portion formed in the lead insertion hole of the insulating member, so the leads do not fall down to the upper surface of the electrode body, thereby preventing contact. I can do it.

Furthermore, since the leads are supported by the bridge portion, the insulating member is pushed down by the leads. Therefore, if the bridging portion is made thin and elastic, the pressure of the leads can be absorbed by the bridging portion and the entire insulating member can be prevented from being pushed downward.

(C) Embodiments Embodiments of the present invention will be described below with reference to FIGS. 1 and 2, taking a cylindrical non-aqueous electrolyte battery equipped with a spiral electrode body as an example.

Reference numeral 1 denotes a battery case which also serves as a positive electrode terminal, and a spiral electrode body 5 in which a positive electrode plate 2 having manganese dioxide as an active material and a negative electrode plate 3 comprising a lithium plate are wound together with a separator 4 in between is housed inside the battery case. has been done.

Reference numeral 6 denotes a sealing lid which also serves as a negative terminal and is equipped with a safety valve device, and includes a sealing plate 8 provided with a valve hole 7 and a cutting blade 9.
a dish-shaped terminal plate 11 provided with a gas vent hole 10;
The opening of the battery case 1 is closed via an insulating packing 13, which is composed of a flexible thin plate 12 which is bent by the gas pressure inside the battery and broken when it comes into contact with the cutting blade 9 at a predetermined gas pressure.

Reference numeral 14 denotes an insulating member which is the gist of the present invention and is disposed between the upper surface of the electrode body 5 and the sealing lid 6, and its details will be explained based on FIG. 2.

The insulating member 14 according to the present invention has an annular shape and has a lead insertion hole 141 that also serves as a liquid injection hole, and a bridge portion 142 that supports the negative electrode lead 16 covered with the insulating tube 15. The thickness of the bridging portion 142 is made thinner than the thickness of the base material of the insulating member, and is imparted with elasticity. In addition, 143,1
44 acts as an auxiliary liquid injection hole.

Further, the insulating member according to the present invention has cut portions 145, 145 provided on the opposing surfaces to regulate the left-right and up-down directionality, and groove portions 146, 146 provided eccentrically from the center position on the other opposing outer periphery. Consideration has been given to regulating the directionality of left and right, front and back, and to enable automatic feeding.

(g) Effects of the invention As mentioned above, according to the battery of the invention, the annular insulating member provided with the lead insertion hole is provided with a bridging part, so the excess length of the lead is supported by this bridging part. Since the leads are not allowed to come into contact with the upper surface of the electrode body, internal short circuits caused by contact between the leads and the electrode body can be effectively prevented.

Further, by making the thickness of the bridging portion smaller than the thickness of the base material of the insulating member to impart elasticity, it is possible to prevent the insulating member from being pushed down by the pressure of the leads.

[Brief explanation of the drawing]

Figures 1 and 2 relate to the present invention; Figure 1 is a sectional view of the main parts of the battery, Figure 2 shows an insulating member, and
is a plan view, B is a side view, and C is a central vertical sectional view. Further, FIGS. 3 and 4 show a conventional insulating member, with A being a plan view and B being a central vertical sectional view, respectively. DESCRIPTION OF SYMBOLS 1... Battery case, 5... Electrode body, 6... Sealing lid, 13... Insulating packing, 14... Insulating member, 141... Lead insertion hole, 142... Bridge portion, 143, 144... Auxiliary Liquid injection hole, 145...
Cut portion, 146...Groove portion.

Claims (1)

[Scope of utility model registration request] An opening of a battery case housing an electrode body is closed by a sealing lid via insulating packing, and an insulating member is disposed between the upper surface of the electrode body and the sealing lid, the insulating member having a lead insertion hole. 1. A cylindrical battery, which is an annular body and has a bridging portion formed in the insertion hole, and the thickness of the bridging portion is smaller than the thickness of a base material of an insulating member.