CN2829105Y

CN2829105Y - Built-in lithium cell

Info

Publication number: CN2829105Y
Application number: CN200520055345.3U
Authority: CN
Inventors: 许炎
Original assignee: Huizhou TCL Jinneng Battery Co Ltd
Current assignee: TCL Corp
Priority date: 2005-03-03
Filing date: 2005-03-03
Publication date: 2006-10-18
Anticipated expiration: 2015-03-03

Abstract

The utility model relates to a built-in lithium cell. A soft electric core and a protection circuit board are arranged in a cell shell body. An electrode outer terminal is electrically connected with an electrode ear of the soft electric core by the protection circuit board. The cell shell body is in the shape of a flat pipe, and a front end cover and a rear end cover are arranged on both ends of the cell shell body. A locking device is fixed on the front end of the cell shell body. The protection circuit board and an electrode are assembled on the locking device, or the protection circuit board is assembled and fixed on the front end cover. The electrode outer terminal is fixedly assembled on the outer surface of the front end cover. The electrode ear of the soft electric core is directly and electrically connected with the protection circuit board. A metal shell body which is formed once is adopted by a cell outer shell. The built-in lithium cell uses a special making tool to carry out assemblage, and the built-in lithium cell has convenient and simple technology, and simple operation. The self rigidity of the built-in lithium cell is further enhanced. Plastic injection technology is adopted. Various elements of the built-in lithium cell are solidified into an integral body, and the built-in lithium cell has good waterproof performance. The space occupied by the built-in lithium cell is effectively reduced, and the unit volume capacity of the built-in lithium cell is enhanced.

Description

A kind of built-in lithium battery

Technical field

The utility model relates to a kind of built-in lithium battery, is meant especially a kind ofly adopt to inject in assembling process that the plastic cement mode is filled, the built-in lithium battery of fixing internal components and parts.

Background technology

Because the advantage of capacity and all many-sides such as discharge time, volume, the lithium battery that adopts mostly is lithium ion/lithium polymer battery now, and along with the development of lithium-ion electric pool technology, its cost performance improves constantly, and causes it by all trades and professions extensive use.The same with other batteries, when lithium battery uses generally speaking also will by battery case or similarly the installation position install, and compress mechanism by spring etc. and position and be electrically connected, so these need built-in battery all have higher rigidity.But for the polymer Li-ion flexible-packed battery, its electric core adopts softer plastic-aluminum packaging film to pack, so battery structure design is gone up and must be improved, with the rigidity of raising battery itself with dwindle its shared space as far as possible and improve its volume capacity coefficient.China's ZL00124327.6 patent " production method of electric core square shell body of lithium cell " and ZL01109135.5 " electric core square shell body of lithium cell and manufacture method thereof " have proposed a kind of production method of electric core square shell body of lithium cell, the employing normal temperature drawing fast/soldering group technology that is shaped, though production efficiency height, expense are lower, but soldering processes very complicated still comparatively speaking, real realize efficient.China's ZL99244912.X patent " a kind of package casing of lithium ion battery " has proposed a kind of scheme with plastic housing alternative metals shell, replaces but its essence only is simple material, there is no new meaning aspect the structure connection.China's ZL01136578.1 patent " square casing for lithium ion cell and manufacture method thereof " adopts the method for welding again after the punching, and practical value is limited, how not to assemble during particularly to employing flexible package lithium cell to relate to.

The utility model content

The problem of the required solution of the utility model is how to improve the rigidity of battery by the internal structure of improving lithium battery itself and dwindle the shared space of housing as far as possible, improve its volume capacity coefficient.

Designed a kind of built-in lithium battery according to the problems referred to above; comprise battery container; in housing, be provided with soft electric core and protective circuit plate or module; the electrode external terminal of battery is by the protective circuit plate or module is corresponding with cell polar ear electrically connects; its housing is flat tube shape; two ends are before the front and back mouth of pipe is provided with; rear end cap; be fixed with locking device at front end; protective circuit plate or module are assemblied on the locking device; the electrode external terminal of battery is assemblied in the outer surface of locking device; the lug of soft electric core connects with the inner surface of locking device; perhaps protective circuit plate or module are assembled and are fixed on the front end housing by Shooting Technique; the electrode external terminal fixedly is assemblied in the outer surface of front end housing, the lug of soft electric core directly and the protective circuit plate electrically connect.

At this, flat tube shape housing utilizes panel beating or special equipment to form folded with the mode convolution that forms the square-section, two ends butt joint behind the convolution by the metal sheet that stamping-out is shaped.Be arranged between the soft electric core of flat tube shape housing inner chamber and housing inner chamber and be connected.Fit at electric core behind the metal shell of preliminarily forming and housing to be finished convolution adopt between forward and backward end cap that the injection moulding mode forms and housing and interior protective circuit plate thereof or module, the electric core to sealing and clamping again, fixedly connected.

Battery case of the present utility model adopts the one-shot forming metal shell, utilizes special-purpose fixture to assemble, and technology is letter, simple to operate just, and has further improved the rigidity of internal battery self; Taked the plastic cement injection technology, the multiple element of battery is cured as one, water resistance is good; Also effectively dwindle internal battery and taken up space, improved battery unit volume capacity.

Description of drawings

Accompanying drawing 1 is the parts decomposing schematic representation after the utility model assembling.

Embodiment

Accompanying drawing is given a kind of execution mode that has shown when the utlity model has locking device, includes external terminal 52, metal shell 2, flexible package lithium cell 3, and front end housing 5, the rear end cap 1 of injection mo(u)lding.External terminal is inserted among the locking device 4 by its baffle or directly uses the gold-plated terminal of PCB and be fixed within the locking device, forms the locking device assembly thus.The locking device assembly is positioned in encapsulation place of flexible-packaged lithium cell polar ear, and lithium cell lug 31 is welded on the external terminal baffle and with external terminal and electrically connects, and external terminal is then realized electrically connecting by plate 51 and circuit protection plate or cell polar ear.Metal shell is one time punching molded sheet metal, in order to improve the mechanical strength of battery self; After the soft electric core that will connect baffle was put into metal-back, the soft electric core utilization was bonded at its surperficial double faced adhesive tape and is fixed in the metal-back; Utilize special-purpose fixture metal-back is carried out convolution to folded make it form cross section flat tube for rectangle or required shape after, two ends butt joint and utilize the double faced adhesive tape on soft electric core surface temporarily to locate behind its convolution, then metal-back, electric core and locking device assembly etc. are put into injection mold in the lump, with forward and backward end cap once injection moulding, and utilize forward and backward lid to form sealing and by injection moulding to the clamping of metal-back, electric core and locking device assembly etc., fixing.

When not having locking device, relative more succinct of structure, but relatively poor to the protection of external terminal, cell polar ear and relevant circuit, other assembling process and structural similarity.

Claims

1, a kind of built-in lithium battery comprises battery container, is provided with soft electric core and protective circuit plate or module in housing, and the electrode external terminal of battery is by the protective circuit plate or module is corresponding with cell polar ear electrically connects, and it is characterized in that

Housing is flat tube shape, and two ends are provided with forward and backward end cap, are fixed with locking device at front end; protective circuit plate or module are assemblied on the locking device; the electrode external terminal of battery is assemblied in the outer surface of locking device, and the lug of soft electric core connects with the inner surface of locking device

Perhaps protective circuit plate or module assembling and being fixed on the front end housing, the electrode external terminal fixedly is assemblied in the outer surface of front end housing, and the direct and protective circuit plate of the lug of soft electric core electrically connects.

2, built-in lithium battery according to claim 1 is characterized in that adopting metal sheet stamping-out, convolution, being connected between to soft electric core in the folded flat tube shape housing that form, the square-section and housing.

3, built-in lithium battery according to claim 2 is characterized in that after electric core fits into the metal shell of preliminarily forming housing is finished convolution to be adopted between forward and backward end cap that the injection moulding mode forms and housing and interior protective circuit plate thereof or module, the electric core to sealing and clamping again and fixedly connected.