CN101224523A - Laser welding method of metal parts and welding method of battery seal - Google Patents

Abstract

The invention relates to a welding method of a battery seal; at first, a battery unit is arranged into a cylinder body and the battery unit is sealed in the cylinder body by a sealing plate; the sealing plate and the cylinder body are hermetically welded by a laser welding type. The invention is characterized in that an incident laser beam offsets a contact line between the cylinder body and the sealing plate during the welding, and the sealing plate and the cylinder body are connected together through the melting type. As the laser beam offsets the contact line between the cylinder body and the sealing plate, the laser beam in the welding process of the manufacture method which is provided by the invention does not directly or reflectively enter the cylinder body and damage the battery unit. The invention can be used for the manufacture of metal shell sealing typed batteries.

Description

The method for laser welding of metalwork and the welding method of battery seal

Technical field

The present invention relates to the method for laser welding of metalwork, also relate to the welding method of battery seal.

Background technology

In recent years, computer, communication electronic product and consumption electronic product function are more and more strong, and its appearance and size requirement is more and more little, so high power capacity, undersized battery product receive an acclaim.Lithium ion battery particularly, it has characteristics such as capacity macro-energy density height, voltage height, constantly rises in the occupation rate of market of products such as mobile phone, notebook computer, digital camera.

Battery, particularly inside lithium ion cell positive plate, negative plate and electrolyte, active material on the positive/negative plate and electrolyte easily with air, steam reflection, therefore, battery needs to seal fully.

General, the positive/negative plate of battery, electrolyte, barrier film are accommodated in the cylindrical shell jointly, and by hush panel cylindrical shell are sealed.Usually cylindrical shell and hush panel are connected as a single entity by laser weld.Laser weld is to utilize the contacted zone of focus scanning metal to be welded of laser beam, and high temperature links together metal melting.Carrying out the laser weld cylindrical shell when sealing, the contacted gap of laser beam flying cylindrical shell and hush panel line reaches the welded seal purpose.When laser beam flying one is thoughtful when getting back to scan start point, welded seal is finished, however in real process because this initial point position is wayward, cause welding closed fully easily, do not cause sealing sealing fully.In order to ensure the sealing of lithium ion battery cylindrical shell, one week of laser beam flying get back to scan start point after, laser beam continues forward to scan micro-distance along former welding track, so that weld seam is closed fully.

During welding, laser beam points to inside battery, and regular meeting punctures the barrier film or the pole piece of inner barrel battery unit when passing the laser beam of slit, causes internal short-circuit of battery or micro-short circuit; Even adopt the laser beam with certain inclination angle that it is welded, the section of hush panel and cylindrical shell contact wire can reflex to inner barrel with the part laser beam equally, makes battery unit impaired

Summary of the invention

Purpose formula of the present invention provides a kind of method for laser welding of metalwork, and laser beam enters hurtful technical problem along connecting seam when having solved laser weld.

Following technical scheme is provided for achieving the above object: first weldment adopts laser weld to be connected with second weldment, and during welding, the laser beam incident point departs from the connecting line of first weldment and second weldment and drops on first

On the weldment, the opposite of the first weldment incidence point is replaced by second weldment.

Further, the incidence angle of described laser beam is more than or equal to 0 degree, less than 90 degree

Further, the incidence angle of described laser beam is 5～45 degree.The welding method that the purpose of this invention is to provide a kind of battery seal, laser beam is to the problem of the battery unit easy damaged battery unit in the cylindrical shell when specifically solving laser weld.

For reaching above-mentioned purpose, adopt following technical scheme, the welding method of battery seal, insert battery unit in the cylindrical shell, and with hush panel with in battery unit shutoff and the cylindrical shell, the mode that adopts laser weld is with hush panel and cylindrical shell welded seal, and incoming laser beam departs from the contact wire of cylindrical shell and hush panel during welding, and described hush panel and described cylindrical shell fusion are linked together.

Further, the incident direction of described laser beam is pointed to cylindrical shell, has hush panel to support on the laser incidence point opposite of cylindrical shell.

Advance one one, the incident direction of described laser beam is pointed to hush panel, on the laser incidence point opposite of hush panel barrel support is arranged.

Further, the incidence angle of described laser beam is more than or equal to 0 degree, less than 90 degree.

Further, the incidence angle of described laser beam is 5～45 degree.

Beneficial effect, metal laser welding method provided by the invention, during welding laser beam not can along the contact wire of weldment directly or reflection pass the welding slit.Battery laser welding sealing method provided by the invention is because laser beam departs from the contact wire of cylindrical shell and hush panel, so laser beam can directly or not reflect and enters inner barrel and damage battery unit in the welding process.Moreover the laser beam incident angle can not cause damage to laser gun greater than zero degree so the laser energy after by the reflection of the molten metal in the molten bath.

Description of drawings

Fig. 1 is battery structure figure;

Fig. 2 is an A place partial enlarged drawing among Fig. 1 when adopting the welding manner ofembodiment 1;

Fig. 3 is a gained johning knot composition afterembodiment 1 welding is finished;

Fig. 4 is an A place partial enlarged drawing among Fig. 1 when adopting the welding manner ofembodiment 2;

Fig. 5 is a gained johning knot composition afterembodiment 1 welding is finished.

The specific embodiment

This welding method is described in detail in detail in conjunction with specific embodiments:

Embodiment 1

Consult Fig. 1, Fig. 2, Fig. 3, the welding method of battery seal,insert battery unit 3 in thecylindrical shell 4, andbattery unit 3 is plugged in thecylindrical shell 4 withhush panel 1, the mode that adopts laser weld is withhush panel 1 andcylindrical shell 4 welded seals, thecontact wire 2 that incoming laser beam departs fromcylindrical shell 4 andhush panel 1 during welding guarantees simultaneously that with 0 degree incidence angle θ sensingcylindrical shell 4 the laser incidence point opposite ofcylindrical shell 4 hashush panel 1 to support.Laser beam flying becomes behind the blockade line withcylindrical shell 4 andhush panel 1 seal welding together, and particularly,cylindrical shell 1 wall thickness b is 0.2mm, and the laser weld degree of depth is 0.4mm, so the depth of weld of laser beam is enough to itself andhush panel 1 be welded togethercylindrical shell 1 fusion.

Embodiment 2

Consult Fig. 1, Fig. 4, Fig. 5, the welding method of battery seal,insert battery unit 3 in thecylindrical shell 4, andbattery unit 3 is plugged in thecylindrical shell 4 withhush panel 1, the mode that adopts laser weld is withhush panel 1 andcylindrical shell 4 welded seals, thecontact wire 2 that incoming laser beam departs fromcylindrical shell 4 andhush panel 1 during welding guarantees simultaneously that with 5～45 degree incidence anglessensing hush panel 1 the laser incidence point opposite ofhush panel 1 hascylindrical shell 4 end faces to support.Whereinhush panel 1 thickness at laser incidence point place is 0.2mm, and the LASER BEAM WELDING degree of depth is 0.4mm, and laser beam flying becomes behind the blockade line withcylindrical shell 4 andhush panel 1 seal welding together.

Claims (8)

1. the method for laser welding of a metalwork, first weldment adopts laser weld to be connected with second weldment, it is characterized in that: the laser beam incident point departs from the connecting line of first weldment and second weldment and drops on first weldment during welding, and the opposite of the first weldment incidence point is replaced by second weldment.

2. the method for laser welding of metalwork according to claim 1, the incidence angle of described laser beam are more than or equal to 0 degree, less than 90 degree.

3. the method for laser welding of metalwork according to claim 1, the incidence angle of described laser beam are 5～45 degree.

4. the welding method of a battery seal, insert battery unit in the cylindrical shell, and with hush panel with in battery unit shutoff and the cylindrical shell, the mode that adopts laser weld is with hush panel and cylindrical shell welded seal, it is characterized in that, incoming laser beam departs from the contact wire of described cylindrical shell and described hush panel during welding, and described hush panel and described cylindrical shell fusion are linked together.

5. the welding method of battery seal according to claim 4 is characterized in that, the incident direction of described laser beam is pointed to cylindrical shell, has hush panel to support on the laser incidence point opposite of cylindrical shell.

6. the welding method of battery seal according to claim 4 is characterized in that, the incident direction of described laser beam is pointed to hush panel, on the laser incidence point opposite of hush panel barrel support is arranged.

7. according to the welding method of any described battery seal of claim 4～6, it is characterized in that the incidence angle of described laser beam is more than or equal to 0 degree, less than 90 degree.

8. according to the welding method of the described battery seal of claim 4～6, it is characterized in that described laser beam incident angle is 5～45 degree.

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