CN107497784B

CN107497784B - Laser cleaning method and laser cleaning method for liquid injection hole of power battery

Info

Publication number: CN107497784B
Application number: CN201710598083.2A
Authority: CN
Inventors: 钱德宇; 胡勇; 刘昊; 徐作斌; 高云峰
Original assignee: Han s Laser Technology Industry Group Co Ltd
Current assignee: Shenzhen Han's Lithium Battery Intelligent Equipment Co ltd
Priority date: 2017-07-20
Filing date: 2017-07-20
Publication date: 2020-05-19
Anticipated expiration: 2037-07-20
Also published as: CN107497784A

Abstract

The invention discloses a laser cleaning method, which comprises the following steps: s1, setting a laser cleaning track on the laser cleaning device; s2, determining an area to be cleaned; s3, carrying out laser cleaning on the area to be cleaned according to the laser cleaning track; the progressive angle of the laser cleaning track is 45 degrees. According to the laser cleaning method, the cleaning tracks which are filled in the progressive 45-degree direction and continuously cleaned for 4 times are adopted, so that a good residual electrolyte cleaning effect can be obtained, the cleaned lines are fine and uniform, and the continuous or pulse laser welding yield of the seal nail can be further improved.

Description

Laser cleaning method and laser cleaning method for liquid injection hole of power battery

Technical Field

The invention relates to the field of laser cleaning, in particular to a laser cleaning method, and particularly relates to a laser cleaning method for a liquid injection hole of a power battery.

Background

At present, the development of new energy automobiles steps into a key period, and the power battery has the problems of high cost, capacity shortage, poor stability and the like. The power battery is a key technology of the electric automobile, determines the running mileage and the cost of the automobile, and the electro-laser welding becomes an important process for manufacturing the power battery. The quality of seal nail welding quality directly determines monomer power battery yields, among the prior art, as shown in fig. 1, annotate liquid hole 2 injection electrolyte on the power battery apron 1, accomplish the back of pouring into, annotate the position of liquid hole 2 and can remain electrolyte, need adopt marking machine to carry out laser cleaning in the production, and annotate the abluent clean degree of liquid mouth laser and directly influencing seal nail's welding quality, so the laser cleaning who pours the liquid hole after pouring into electrolyte is vital in battery production.

In the existing production process, a single battery is generally inserted into a sealing nail (such as a glue nail) immediately after electrolyte is injected, residual electrolyte in an electrolyte injection hole and on the periphery of the electrolyte injection hole is wiped by a physical method, then a marking machine is adopted to sequentially fill and mark in a progressive 90-degree direction for cleaning (as shown in figure 2), although the electrolyte can be cleaned and removed by adopting the cleaning track, the cleaning is not thorough in the mode, the electrolyte still remains, and therefore the welding quality of the sealing nail 3 can still be influenced.

Therefore, it is necessary to provide a laser cleaning method which has a good cleaning effect and thus improves the yield of the seal nails during welding.

Disclosure of Invention

Aiming at the defects, the invention provides an optimized laser cleaning method, in particular to a laser cleaning method for a liquid injection port of a cover plate of a power battery, which adopts a cleaning track of progressive 45-degree filling and continuous cleaning for 4 times, can obtain good residual electrolyte cleaning effect, has fine and uniform lines after cleaning, and can further improve the continuous or pulse laser welding yield of sealing nails.

The technical scheme provided by the invention for the technical problem is as follows:

in one aspect, a laser cleaning method is provided, which includes the following steps:

s1, setting a laser cleaning track on the laser cleaning device;

s2, determining an area to be cleaned;

s3, carrying out laser cleaning on the area to be cleaned according to the laser cleaning track;

in step S1, the progressive angle of the laser cleaning track is 45 degrees.

Preferably, the laser cleaning of the track is done by enabling filling.

Preferably, the enabling fills are arcuate fills.

Preferably, the spacing between the filling-enabled filling lines of the filling-enabled is 0.01-0.04 mm.

Preferably, the laser cleaning device is a laser marking machine.

On the other hand, the laser cleaning method for the liquid injection hole of the power battery is also provided, and comprises the following steps:

s1, setting a laser cleaning track on the laser cleaning device, wherein the progressive angle of the laser cleaning track is 45 degrees;

s2, injecting electrolyte into the power battery through an electrolyte injection hole in the power battery cover plate, sealing the electrolyte injection hole by using a sealing nail after the electrolyte is injected, and determining an area to be cleaned;

and S3, carrying out laser cleaning on the area to be cleaned according to the laser cleaning track.

Preferably, the laser cleaning of the track is done by enabling filling.

Preferably, the enabling fills are arcuate fills.

Preferably, the cleaning speed V of the laser cleaning is between 4500mm/s and 5500 mm/s.

According to the invention, the good cleaning effect on the residual electrolyte in the liquid injection hole can be realized only by optimizing the laser cleaning track (such as the progressive angle of the laser cleaning track is 45 degrees), the laser cleaning efficiency is high, the operation is easy, and the welding quality of the sealing nail can be greatly improved.

Drawings

FIG. 1 is a schematic diagram of a power battery cover plate according to the prior art;

FIG. 2 is a schematic diagram of a laser cleaning track with a progressive angle of 90 degrees and a sequence in the prior art;

FIG. 3 is a flowchart illustrating steps of a laser cleaning method according to an embodiment;

FIG. 4 is a schematic diagram of a laser cleaning track with a progressive angle of 90 degrees and a sequence according to an embodiment;

FIG. 5 is a schematic diagram of an enable fill line in one embodiment;

FIG. 6 is a flowchart of the steps of the laser cleaning method for the liquid injection hole of the power battery in the second embodiment;

fig. 7 is a schematic diagram of laser cleaning tracks and sequence with a progressive angle of 90 degrees in the laser cleaning method for the liquid injection hole of the power battery according to the second embodiment.

Detailed Description

For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

The first embodiment is as follows:

fig. 3 shows a flow of steps of the laser cleaning method of the present invention, which includes the following steps:

s1, setting a laser cleaning track on the laser cleaning device;

s2, determining an area to be cleaned;

in this embodiment, in the step S1, the progressive angle of the laser cleaning track is 45 degrees, and the laser cleaning track is completed by enabling filling.

specifically, as shown in fig. 4, the serial number (i) indicates an initial filling angle (0 degree), and the serial numbers (ii) - (iii) indicate sequential filling according to a progressive angle of 45 degrees, so as to complete the laser cleaning track, thereby obtaining a good residual electrolyte cleaning effect after continuous cleaning for 4 times, and the cleaned lines are fine and uniform, thereby further improving the continuous or pulse laser welding yield of the seal nail.

Preferably, as shown in fig. 5, the enable fills are arcuate fills, and the spacing d between the enable fill lines 200 of the enable fills is 0.01-0.04mm, which may be particularly preferably 0.03 mm.

Meanwhile, the laser cleaning device is a laser marking machine, the power P of the laser marking machine is 18W, the laser marking machine comprises a galvanometer with the focal length of 160mm, and when the laser cleaning is carried out, the laser cleaning speed is 4500 mm/s-5500 mm/s (preferably 5000mm/s), the defocusing amount f is 0mm, and the Q frequency is 50 KHz.

Example two:

as shown in fig. 6, the invention further provides a laser cleaning method for the liquid injection hole of the power battery, which comprises the following steps:

s2, as shown in fig. 7, injecting electrolyte into the power battery through the electrolyte injection hole 10 on the power battery cover plate 100, and after injecting the electrolyte, sealing the electrolyte injection hole 10 with a sealing nail 20, wiping with cloth or the like to remove a large amount of residual electrolyte, and determining a region to be cleaned (the region to be cleaned is a region where the electrolyte may remain);

and S3, fixing the power battery by using a clamp, carrying out laser cleaning on the area to be cleaned according to the laser cleaning track, and not cleaning the position of the sealing nail 20.

Other technical features are identical to those of the first embodiment, and are not described herein again.

It should be noted that the technical features in the first and second embodiments can be arbitrarily combined, and the technical solutions obtained by combining the technical features belong to the scope of the present invention.

In conclusion, the laser cleaning method provided by the invention adopts the cleaning track which is filled in the progressive 45-degree direction and is continuously cleaned for 4 times, so that a good residual electrolyte cleaning effect can be obtained, the cleaned lines are fine and uniform, and the continuous or pulse laser welding yield of the seal nail can be further improved.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. A laser cleaning method comprises the following steps:

s1, setting a laser cleaning track on the laser cleaning device;

s2, determining an area to be cleaned;

in step S1, the progressive angle of the laser cleaning trajectory is 45 degrees, and the laser cleaning trajectory is completed by enabling filling, which is arcuate filling.

2. The cleaning method according to claim 1, wherein a pitch between the filling-enabled enable lines is 0.01 to 0.04 mm.

3. The cleaning method according to claim 1 or 2, wherein the laser cleaning device is a laser marking machine.

4. A laser cleaning method for a liquid injection hole of a power battery is characterized by comprising the following steps:

s1, setting a laser cleaning track on the laser cleaning device, wherein the progressive angle of the laser cleaning track is 45 degrees, and completing the laser cleaning track in an enabling filling mode, wherein the enabling filling is bow-row filling;

s2, injecting electrolyte into the power battery through an electrolyte injection hole in a cover plate of the power battery, sealing the electrolyte injection hole by using a sealing nail after the electrolyte is injected, and determining an area to be cleaned;

5. The cleaning method according to claim 4, wherein a pitch between the filling-enabled enable lines is 0.01 to 0.04 mm.

6. The cleaning method according to claim 4 or 5, characterized in that the cleaning speed V of the laser cleaning is between 4500mm/s and 5500 mm/s.