CN2511007Y

CN2511007Y - Cylindrical lithium ion cell core

Info

Publication number: CN2511007Y
Application number: CN01275896U
Authority: CN
Inventors: 张兆谟; 刘立君; 张永
Original assignee: 张兆谟
Priority date: 2001-12-10
Filing date: 2001-12-10
Publication date: 2002-09-11
Anticipated expiration: 2011-12-10

Abstract

A cylinder-type lithium-ion batteries includes a cover board shaped like a wafer, a circular orifice is arranged on the axis of the cover board, an anti-explosion valve and a filler hole are arranged on both sides of the flat of the wafer respectively; an upper sealed tablet is arranged on the cover board; a pressure plate is placed above the upper sealed tablet; a lower sealed tablet is placed on the back of the cover board; an electrodes film shaped a Gamma-type is a strip of sheet metal, which is arranged at the bottom of the lower sealed tablet; each axes of the described upper sealed tablet, the pressure plate, the lower sealed tablet and the electrodes film is provided with a circular orifice and is coaxial with the circular orifice of the cover board; a rivet runs through all the described components riveted tight to connect with each other. The utility model can realizes the vacuum injection, which is conducive to the mass production; The utility model can open formation, which is conducive to improve the performance of the batteries; the edge of the cover board is sealed with the laser, which is in order to good seal and no leakage.

Description

A kind of cylindrical lithium ion electricity core

Technical field:

The utility model relates to a kind of lithium ion battery, relates in particular to a kind of core strueture of cylindrical lithium ion battery.

Background technology:

Lithium ion battery is as a kind of capacity is big, can charge repeatedly is widely used in the portable electronics such as notebook computer, household video camera the land used novel battery, and market prospects are wide.The structure of this battery is the same with general battery, and its shell is the negative pole of battery, and an electric core is stretched out for anodal in the centre of battery one end face, during use load is connected with the both positive and negative polarity of battery to get final product.Because the negative pole of battery, be that battery case essence is a container, filling electrolyte in the inside produces electric current to carry out chemical reaction, therefore, if the cover plate sealing property at the electric core leader place of battery is bad, the electric matter liquid that will trickle from the slit of cover plate as easy as rolling off a logly causes corrosion even damages electrical equipment electrical equipment.

The present cylindrical lithium ion battery that uses, its cover plate separates with the positive electrical core of battery, by arranging the contact combination.With an end indent of battery case, on the step that indent forms, lay an insulated ring during fabrication, the cover plate that combines is put on the insulated ring of indent, seal with the mechanical system punching press again after advancing to annotate electrolyte.The weak point of this structure is:

1, the necessary opening fluid injection of product, very high to the fluid injection environment requirement, be unfavorable for industrialization production in enormous quantities;

2, must seal and change into, be unfavorable for the raising of properties of product;

3, product adopts the mechanical seal mode, and sealing property is bad, leakage easily.

The utility model content

Summary of the invention:

The purpose of this utility model is to provide a kind of electric core of cylindrical lithium ion battery, and the structure of this electricity core can solve the problem of leakage well.

For achieving the above object, a kind of cylindrical lithium ion electricity core and cover plate that the utility model provides are connected as a single entity, and offer explosion-proof valve and liquid injection hole on the cover plate.

The structure of a kind of cylindrical lithium ion electricity core that the utility model provides has following advantage:

1, offers liquid injection hole on its cover plate, can realize the vacuum fluid injection, help producing in batches;

But 2 openings change into, and help the raising of battery performance;

3, with laser welding the cover plate periphery is sealed, its good airproof performance can leakage.

Description of drawings:

Fig. 1 is the stereoscopic schematic diagram of known lithium ion battery;

Fig. 2 is the stereoscopic schematic diagram of the lithium ion battery of employing the utility model lithium-ion electric core assembling;

Fig. 3 is that lithium-ion electric core of the present utility model separates schematic diagram;

Fig. 4 is a lithium-ion electric core assembling schematic diagram of the present utility model;

Fig. 5 is the right view of Fig. 4;

Fig. 6 is the vertical view of Fig. 4.

Embodiment:

Known lithium ion battery extrudes groove at an end of its shell, sees Fig. 1, and the step in this groove seals with the mechanical system punching press in order to lay sealing ring and cover plate again.

Lithium ion battery of the present utility model, its electric core is please consulted Fig. 3, Fig. 4, Fig. 5, Fig. 6 simultaneously by being connected with lower member and becoming one:

One cover plate 1 is the disk that an electrical insulator material is made, and present embodiment adopts polytetrafluoroethylene, has one to be elliptoid indent in the middle of the disk, and the place, axle center offers a circular hole 2, and disk dish edge flat both sides are respectively equipped with an explosion-proof valve 3 and a liquid injection hole 4;

Diaphragm seal 5 on one, are ellipticity, just place the interior recess of cover plate 1;

One pressing plate 6 is ellipticity, places the top of diaphragm seal 5;

Last diaphragm seal 5 and pressing plate 6 are stacked and placed on the interior recess of cover plate 1, as shown in Figure 6, Fig. 4 and Fig. 5 are contrasted also its elliptoid structure as can be seen.

One lower sealing piece 7 is round shape, places the back side of cover plate 1;

One electrode leader 8 is a strip sheet metal, is the Γ type, places the below of lower sealing piece 7;

The place, axle center of above-mentioned last diaphragm seal 5, pressing plate 6, lower sealing piece 7 and electrode leader 8 all offers a circular hole, and coaxial with the circular hole 2 of cover plate 1;

One rivet 9 runs through the connection of riveting tightly behind above-mentioned each parts, obtains electric core of the present utility model as shown in Figure 4.

Electric core of the present utility model is packed into behind the battery container, seals between cover plate 1 and the housing, and what present embodiment was used is laser welding.The battery profile of employing the utility model electricity core assembling as shown in Figure 2.

Claims

1. cylindrical lithium ion electricity core, its structure is:

One cover plate is the disk shape, and the place, axle center offers a circular hole, and disk flat both sides are respectively equipped with an explosion-proof valve and a liquid injection hole;

Diaphragm seal on one places the cover plate top;

One pressing plate places the top of diaphragm seal;

One lower sealing piece places the back side of cover plate;

One electrode leader is a strip sheet metal, is the Γ type, places the below of lower sealing piece;

The place, axle center of above-mentioned last diaphragm seal, pressing plate, lower sealing piece and electrode leader all offers a circular hole, and coaxial with the circular hole of cover plate; And a rivet, run through the connection of riveting tightly behind above-mentioned each parts.

2, lithium-ion electric core as claimed in claim 1 is characterized in that, has one to be elliptoid indent in the middle of the described cover plate.

3, lithium-ion electric core as claimed in claim 1 is characterized in that, the described diaphragm seal of going up is ellipticity, just places the interior recess of cover plate top.

4, lithium-ion electric core as claimed in claim 1 is characterized in that, described pressing plate is ellipticity.