CN113714656B

CN113714656B - Battery piece cutting device and method

Info

Publication number: CN113714656B
Application number: CN202010397930.0A
Authority: CN
Inventors: 赖林松; 周志伟; 尹建刚; 颜传祥; 高云峰
Original assignee: Han s Laser Technology Industry Group Co Ltd
Current assignee: Han s Laser Technology Industry Group Co Ltd
Priority date: 2020-05-12
Filing date: 2020-05-12
Publication date: 2023-04-11
Anticipated expiration: 2040-05-12
Also published as: CN113714656A

Abstract

The embodiment of the invention belongs to the technical field of solar cell manufacturing, and relates to a cell slice cutting device and a cell slice cutting method. The battery piece cutting device comprises a mounting seat, a conveying device, a first laser emission assembly, a second laser emission assembly, a first moving device, a jig and a cooling assembly; the first laser emission assembly, the second laser emission assembly and the first moving device are all arranged on the mounting seat; the jig is driven to move by the conveying device; a cutting groove is formed in a battery piece arranged on the jig by first laser emitted by the first laser emitting assembly, and the cutting groove of the battery piece is subjected to radiant heating by second laser emitted by the second laser emitting assembly; the cooling assembly is arranged on the first moving device in a sliding mode; the cooling assembly comprises a nozzle, and a cold source sprayed out of the nozzle cools the cutting groove of the battery piece along with the second laser to break the battery piece along the cutting groove. The battery piece cutting device can reduce the fragment rate of the battery piece in the cutting process, reduce the heat damage area of the battery piece and realize low-loss cutting.

Description

Battery piece cutting device and method

Technical Field

The invention relates to the technical field of solar cell manufacturing, in particular to a cell slice cutting device and a cell slice cutting method.

Background

As is known, a single solar cell cannot be used as a direct power supply, and multiple solar cells need to be spliced together and packaged to form an assembly, which is called a solar cell panel. Among them, the solar cell panel is an important component in a solar power generation system.

In the prior art, a solar cell is mainly cut by a scribing technology, that is, a single crystal or polycrystalline cell is cut into two or more parts by laser. However, in the process of cutting the cell by using the scribing and cracking technology, firstly, a cutting groove with the groove depth of 50-60 um needs to be ablated on the surface of the cell, and then the cell is separated by using a mechanical breaking process, so that obviously, the problems of expansion of a heat affected zone of the cell, hidden cracking, poor section quality, low strength and the like are easily caused by the process route, and the efficiency and the quality of a solar power generation system are influenced; meanwhile, because the cutting depth is deep, a large amount of dust can be generated, and the body health of operators is seriously influenced.

Disclosure of Invention

The embodiment of the invention aims to solve the technical problems that the efficiency and the quality of a solar power generation system are influenced due to the fact that the fragment rate of a cell is high, the heat damage area is large, the strength of the cut cell is low and the section quality is poor in the existing cell cutting method.

In order to solve the above technical problems, an embodiment of the present invention provides a battery piece cutting device, which adopts the following technical solutions:

the battery piece cutting device comprises a mounting seat, a conveying device, a first laser emission assembly, a second laser emission assembly, a first moving device, a jig and a cooling assembly;

the mounting seat is vertically arranged and is positioned at the top end of the conveying device; the first laser emission assembly, the second laser emission assembly and the first moving device are all arranged on the mounting base, and the first laser emission assembly and the second laser emission assembly are arranged side by side and are all positioned at the top of the first moving device; the jig can be driven by the conveying device to move in the laser radiation areas of the first laser emission assembly and the second laser emission assembly, and is used for loading the battery piece;

the first laser emission assembly and the second laser emission assembly are arranged above the jig, and a first laser emitted by the first laser emission assembly and a second laser emitted by the second laser emission assembly can be emitted to the battery piece arranged on the jig in sequence; the first laser is used for forming a cutting groove in the battery piece along the cutting path of the battery piece, and the second laser is used for heating the battery piece after being subjected to groove opening along the corresponding cutting groove in a radiation mode so that the battery piece is split along the cutting groove;

the first moving device is positioned above the jig;

the cooling assembly is arranged on the first moving device in a sliding mode along a first direction; the cooling component comprises at least one nozzle, the spout orientation of nozzle the tool, the nozzle can follow from spout spun cold source the second laser is to the battery piece the heating position of cutting cut groove carries out the retinue cooling and accelerates the automatic lobe of a cell piece, wherein, first direction is first laser emission subassembly and second laser emission subassembly direction side by side.

As a further improvement of the above technical solution, the first laser emission component includes a pulse laser and a first galvanometer scanning system, and a first laser emitted by the pulse laser can be emitted to a battery piece mounted on the jig after passing through the first galvanometer scanning system;

the second laser emission component comprises a continuous laser and a second galvanometer scanning system, and second laser emitted by the continuous laser can shoot to a battery piece arranged on the jig after passing through the second galvanometer scanning system.

As a further improvement of the above technical solution, the jig is slidably disposed on the transportation device in a first direction, and the transportation device can linearly move along the first direction.

As a further improvement of the above technical solution, the transportation device includes a second moving device and a third moving device;

the jig is arranged on the second moving device in a sliding mode along a first direction, the second moving device is arranged on the third moving device in a sliding mode along a second direction so that the jig can be close to or far away from the mounting base, and the first direction and the second direction are not parallel on the horizontal plane.

As a further improvement of the above technical solution, the cooling assembly further comprises an installation plate and a cold source generating device disposed on the installation plate; the mounting panel along first direction slip set up in on the first mobile device, cold source generating device with the nozzle is connected.

As a further improvement of the above technical solution, the cold source generating device comprises a body, at least one air inlet pipe and at least one water inlet pipe; the body is connected with one side, close to the second laser emission component, of the mounting plate, and a cavity is formed in the body; the intake pipe the inlet tube with the nozzle all set up in on the outer wall of body and all with the cavity intercommunication.

In order to solve the above technical problem, an embodiment of the present invention further provides a battery slice cutting method, which adopts the following technical solutions:

the battery piece cutting method comprises the battery piece cutting device, and the method comprises the following steps:

feeding: installing the battery piece on a jig, and driving the battery piece on the jig to reach a slotting station below the first laser emission component by the conveying device;

grooving: the first laser emitted by the first laser emitting assembly is focused on a cutting path of the battery piece for grooving to form a cutting groove; the first laser is pulse laser;

splitting: the conveying device drives the slotted battery piece to reach a splitting station below the second laser emission assembly; the second laser emitted by the second laser emitting assembly carries out radiant heating on the slotted battery piece along the corresponding cutting groove so as to split the battery piece along the cutting groove; the second laser is continuous laser;

the first moving device controls the cooling assembly to move in a first direction, so that the cold source sprayed out from the nozzle can follow the second laser to carry out accompanying cooling on the heating part of the cutting groove of the battery piece.

As a further improvement of the technical scheme, the groove depth range of the cutting groove formed by grooving the cutting channel of the cell by the first laser is 5-30 um.

As a further improvement of the above technical solution, in the step of focusing the first laser emitted by the first laser emitting assembly on the cutting street of the cell slice for grooving, the moving speed of the first laser is in the range of 1000-1800 mm/s;

and in the step of heating the slotted battery piece along the corresponding cutting slot by the second laser emitted by the second laser emitting assembly in a radiation manner so as to split the battery piece, the moving speed of the second laser is 400-600 mm/s.

As a further improvement of the above technical solution, in the step of cooling the heating part of the cutting groove of the cell sheet by the cold source sprayed from the nozzle following the second laser, the cold source sprayed from the nozzle is water mist, the air flow pressure of the water mist sprayed from the nozzle is in the range of 0.3 to 0.6Mpa, and the water flow rate is in the range of 2 to 5ml/min.

Compared with the prior art, the battery piece cutting device and the battery piece cutting method provided by the embodiment of the invention have the following main beneficial effects:

the battery piece cutting device is characterized in that a cutting channel of a battery piece is grooved by first laser emitted by a first laser emitting assembly to form a cutting groove, the grooved battery piece is subjected to radiation heating along the cutting groove by second laser emitted by a second laser emitting assembly so as to split the battery piece along the cutting groove, and a cold source sprayed by a nozzle of a cooling assembly is subjected to cooling following along with the second laser on a heating part of the cutting groove of the battery piece and accelerates automatic splitting of the battery piece; the second laser and a cold source sprayed out of the nozzle are matched to generate temperature difference to form thermal stress, so that the battery piece is quickly disconnected along the cutting groove to automatically split the battery piece into two halves. According to the battery piece cutting device and the battery piece cutting method, the battery piece is cut through the cooperation of the first laser, the second laser and the cold source, so that the battery piece is directly broken along the cutting path, a mechanical piece breaking process is not needed, the fragment rate of the battery piece in the cutting process can be effectively reduced, the heat damage area caused by the battery piece during cutting is reduced, the overall strength of the battery piece is improved, the section quality and the straightness of the battery piece are improved, and the low-loss cutting of the battery piece is realized.

Drawings

In order to illustrate the solution of the invention more clearly, the drawings that are needed in the description of the embodiments are briefly described below, it is obvious that the drawings in the description below are some embodiments of the invention, and that other drawings can be derived from them by a person skilled in the art without inventive effort.

Fig. 1 is a schematic structural view of a battery plate cutting device according to an embodiment of the present invention;

fig. 2 is a schematic structural view of the battery plate cutting device in fig. 1 in another direction;

FIG. 3 is a schematic structural diagram of a cooling source generating device of the battery cutting device shown in FIG. 1;

FIG. 4 is a schematic diagram of a cutting method of a battery piece according to an embodiment of the invention;

fig. 5 is a schematic diagram of a battery plate cutting method according to another embodiment of the invention.

Reference numerals:

100. a battery piece cutting device;

1. a mounting seat; 2. a jig; 3. a transportation device; 31. a second mobile device; 32. a third mobile device; 4. a first laser emitting assembly; 41. a first galvanometer scanning system; 5. a second laser emitting assembly; 51. a second galvanometer scanning system; 6. a first mobile device; 7. a cooling assembly; 71. mounting a plate; 72. a cold source generating device; 721. a body; 722. an air inlet pipe; 723. a water inlet pipe; 725. a cavity; 73. a nozzle; 8. a battery piece; 81. and cutting a channel.

Detailed Description

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs; the terminology used in the description presented herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention, e.g., the terms "length," "width," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," "outer," etc., refer to an orientation or position based on that shown in the drawings, are for convenience of description only and are not to be construed as limiting of the present disclosure.

The terms "including" and "having," and any variations thereof in the description and claims of this invention and the description of the figures above, are intended to cover non-exclusive inclusions; the terms "first," "second," and the like in the description and in the claims, or in the drawings, are used for distinguishing between different objects and not necessarily for describing a particular sequential order.

In the description and claims of the present invention and in the description of the above figures, when an element is referred to as being "fixed" or "mounted" or "disposed" or "connected" to another element, it can be directly or indirectly located on the other element. For example, when an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element.

Furthermore, reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the invention. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

It should be noted that the battery piece 8 in the embodiment of the present invention may be a solar battery piece, and may also be a battery piece of another suitable type of battery. In addition, the cell slice cutting device 100 in the embodiment of the invention can be used in an automatic solar cell production system or production line, and can also be used in other cell production systems or production lines.

The embodiment of the invention provides a battery piece cutting device 100, please refer to fig. 1 and 4, which includes a mounting base 1, a jig 2, a transporting device 3, a first laser emitting assembly 4, a second laser emitting assembly 5, a first moving device 6 and a cooling assembly 7; the mounting seat 1 is vertically arranged and is positioned at the top end of the conveying device 3; the first laser emission assembly 4, the second laser emission assembly 5 and the first moving device 6 are all arranged on the mounting base 1, and the first laser emission assembly 4 and the second laser emission assembly 5 are arranged side by side and are located at the top of the first moving device 6; jig 2 can move in the laser radiation region of first laser emission subassembly 4 and second laser emission subassembly 5 through the drive of conveyer 3, and jig 2 is used for installing battery piece 8.

The first laser emission component 4 and the second laser emission component 5 are both arranged above the jig 2, and a first laser emitted by the first laser emission component 4 and a second laser emitted by the second laser emission component 5 can be emitted to the battery piece 8 arranged on the jig 2 in sequence; the first laser is used for forming a cutting groove in the battery piece 8 along the cutting path 81 of the battery piece 8, and the second laser is used for heating the battery piece 8 after being grooved along the corresponding cutting groove 91 in a radiation mode so that the battery piece 8 can be cracked along the cutting groove.

The first moving device 6 is positioned above the jig 2; the cooling assembly 7 is arranged on the first moving device 6 in a sliding manner along a first direction; referring to fig. 2, the cooling assembly 7 includes at least one nozzle 73, a nozzle of the nozzle 73 faces the jig 2, and a cold source sprayed from the nozzle 73 can follow the second laser to cool a heating portion of the cutting groove of the battery piece 8 and accelerate automatic splitting of the battery piece 8, where the first direction is a direction in which the first laser emitting assembly 4 and the second laser emitting assembly 5 are parallel; it can be understood that the cutting groove of the battery piece 8 is cooled by the cooling source while being heated by the second laser radiation, so that a temperature difference can be generated to form thermal stress, the battery piece 8 is automatically split into two halves, thermal damage caused when the second laser performs thermal radiation splitting on the cutting groove of the battery piece 8 can be reduced, and the strength of the battery piece 8 is improved.

As can be understood from the above, the working principle of the battery piece cutting apparatus 100 is substantially as follows:

the transportation device 3 drives the jig 2 to move in the laser radiation area of the first laser emission component 4 and the second laser emission component 5. Firstly, the jig 2 is moved to the lower part of the first laser emitting component 4, and the first laser emitted by the first laser emitting component 4 is focused on the cutting channel 81 of the battery piece 8 to be grooved to form a cutting groove (not shown); after the grooving is finished, the conveying device 3 drives the jig 2 to move to the position below the second laser emission assembly 5, and second laser emitted by the second laser emission assembly 5 carries out radiation heating on the grooved battery piece 8 along the corresponding cutting groove so as to enable the battery piece 8 to be cracked along the cutting groove; while the second laser is used for carrying out radiation heating on the cutting groove of the battery piece 8, the first moving device 6 controls the cooling assembly 7 to move in the first direction, so that the cold source sprayed out of the nozzle 73 is enabled to follow the second laser to carry out follow cooling on the heating part of the cutting groove of the battery piece 8 and accelerate automatic splitting of the battery piece 8; the second laser and the cold source sprayed by the nozzle 73 are matched to generate a temperature difference to form thermal stress, so that the battery piece 8 is rapidly broken along the cutting groove, and the battery piece 8 is automatically split into two halves.

In summary, compared with the prior art, the battery piece cutting device 100 at least has the following advantages:

this battery piece cutting device 100 simple structure can directly cut to battery piece 8 along cutting way 81 directly and quick fracture through first laser, second laser and cold source cooperation, need not to use machinery to break off with the fingers and thumb the piece technology off with the fingers and thumb, can effectively reduce the piece rate of cutting in-process battery piece 8, reduces the heat damage region that battery piece 8 leads to when the cutting, improves battery piece 8's bulk strength and improves battery piece 8's section quality and straightness accuracy, realizes battery piece 8's low-loss cutting.

In order to make the technical solutions of the present invention better understood by those skilled in the art, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

In some embodiments, referring to fig. 2, the first laser emitting assembly 4 includes a pulse laser (not shown) and a first galvanometer scanning system 41, and the first laser emitted by the pulse laser can be emitted to the battery cell 8 mounted on the fixture 2 after passing through the first galvanometer scanning system 41. It can be understood that the first galvanometer scanning system 41 enables the first laser to accurately position the cutting street 81 of the cell 8, and can change the light emitting direction of the first laser, so that the first laser can move on the surface of the cell 8 at a predetermined speed to slot the cutting street 81 of the cell 8.

In some embodiments, referring to fig. 2, the second laser emitting assembly 5 includes a continuous laser (not shown) and a second galvanometer scanning system 51, and the second laser emitted by the continuous laser can be emitted to the battery cell 8 mounted on the jig 2 after passing through the second galvanometer scanning system 51. It can be understood that the second laser can accurately position the cut groove of the grooved battery piece 8 through the second galvanometer scanning system 51, and the light emitting direction of the second laser can be changed, so that the second laser can move along the cut groove of the battery piece 8 at a predetermined speed to radiatively heat the battery piece 8.

The first laser is a pulse laser, the second laser is a continuous laser, and the groove is formed along the cutting street 81 on the surface of the battery piece 8 by using the pulse laser, so that the pulse width of the pulse laser is relatively short and the duty ratio is small, so that the heat affected zone near the cutting street 81 of the battery piece 8 can be reduced; the pulse laser can damage the flatness of the surface of the battery, so that the absorption rate of the cutting groove of the battery piece 8 to the subsequent continuous laser can be improved; the cold source moves on the battery piece 8 along with the light spot of the continuous laser to carry out the following cooling on the heating part of the cutting groove of the battery piece 8; the combination of the continuous laser and the cold source generates a temperature difference to form a thermal stress, so that the battery piece 8 is quickly disconnected along the cutting groove to automatically split the battery piece 8 into two halves.

In some embodiments, the jig 2 is slidably disposed on the transporting device 3 in a first direction, and the transporting device 3 moves linearly in the first direction. Understandably, the transportation device 3 drives the jig 2 to move linearly in the first direction, so that the battery piece 8 mounted on the jig 2 can move to the lower part of the first laser emission component 4 or the lower part of the second laser emission component 5 according to the processing requirement.

In some embodiments, referring to fig. 1 and 2, the transportation device 3 includes a second moving device 31 and a third moving device 32;

the mounting base 1 is vertically installed on the third moving device 32 or installed on an external rack, the jig 2 is arranged on the second moving device 31 in a sliding mode along a first direction, the second moving device 31 is arranged on the third moving device 32 in a sliding mode along a second direction so that the jig 2 is close to or far away from the mounting base 1, and the first direction and the second direction are not parallel to each other on the horizontal plane. In this embodiment, the first direction and the second direction are perpendicular to each other, for example, the first direction is an X-axis direction, and the second direction is a Y-axis direction.

It can be understood that, when the battery piece 8 needs to be cut, the third moving device 32 can drive the second moving device 31 to approach the mounting base 1, so that the battery piece 8 enters the lower portion of the first laser emission assembly 4 for grooving, and then the second moving device 31 drives the grooved battery piece 8 to enter the lower portion of the second laser emission assembly 5 along the first direction for splitting, so as to obtain the cut battery piece 8.

In some embodiments, referring to fig. 1 and 2, the first moving device 6, the second moving device 31, and the third moving device 32 are all linear motor modules. It can be understood that the linear motor module has a simple structure, does not need to pass through an intermediate conversion mechanism and directly generates linear motion, reduces the motion inertia, and has high dynamic response performance and positioning precision. Of course, in other embodiments, the first moving device 6, the second moving device 31 and the third moving device 32 may be replaced by an electric cylinder or a servomotor screw structure, and the like, and the invention is not limited herein.

In some embodiments, referring to fig. 2, the cooling assembly 7 includes a mounting plate 71 and a heat sink generating device 72 disposed on the mounting plate 71; specifically, the cold source generating device 72 is located on one side of the mounting board 71 close to the second laser emitting assembly 5; the mounting plate 71 is slidably disposed on the first moving device 6 along a first direction, and the cold source generating device 72 is connected to the nozzle 73, so that the mist generated by the cold source generating device 72 is sprayed out through the nozzle 73.

In some embodiments, referring to fig. 2 and 3, the cold source generating device 72 includes a body 721, at least one air inlet pipe 722 and at least one water inlet pipe 723; the body 721 is connected with one side of the mounting plate 71 close to the second laser emitting component 5, and a cavity 725 is formed in the body 721; the air inlet pipe 722, the water inlet pipe 723 and the nozzle 73 are all arranged on the outer wall of the body 721 and are all communicated with the cavity 725, specifically in the embodiment, one end of the body 721 is provided with the air inlet pipe 722 and the water inlet pipe 723, and the other end opposite to the end is provided with the nozzle 73, so that the air inlet pipe 722, the water inlet pipe 723 and the nozzle 73 are arranged oppositely, and the injection efficiency is improved; it should be noted that the air inlet pipe 722 is used for externally connecting an air supply system, the air supply system supplies compressed air to the cavity 725 in the body 721 through the air inlet pipe 722, the water inlet pipe 723 is used for externally connecting a water supply system, and the water supply system supplies cooling water to the cavity 725 in the body 721 through the water inlet pipe 723. Understandably, the atomized cooling water is uniformly distributed, so that the heating part of the cutting channel 81 of the cell piece 8 can be uniformly cooled, and the influence on the power generation efficiency and the structural strength of the cell piece 8 caused by local thermal damage of the cell piece 8 due to nonuniform cooling is avoided.

It can be understood that when the air inlet pipe 722 is connected to an air supply system and the water inlet pipe 723 is connected to a water supply system, the cooling water and the compressed air enter the cavity 725 of the body 721 to be mixed and sprayed out from the nozzle 73 in the form of water mist, so as to uniformly cool the heated portion of the cutting channel 81 of the cell 8, thereby improving the power generation efficiency and the structural strength of the cell 8. In addition, by providing a plurality of nozzles 73 on the body 721, the plurality of nozzles 73 can be simultaneously driven by the first moving device 6 to reciprocate in the first direction, and the plurality of nozzles 73 can simultaneously cool the parts of the plurality of cutting lanes 81 of the battery piece 8 that are heated by radiation, so that the battery piece 8 can be simultaneously cut in multiple ways, so that the battery piece 8 can be broken into multiple pieces, for example, as shown in fig. 4, the battery piece 8 is divided into two parts along the cutting lanes 81; alternatively, referring to fig. 5, the battery piece 8 is divided into three parts along the two cutting lines 81; therefore, different cutting modes are realized, the compatibility is high, and the equipment productivity can be improved.

Based on the above-mentioned cell cutting device 100, an embodiment of the invention further provides a cell cutting method, please refer to fig. 1 to 5, the cell cutting method includes the above-mentioned cell cutting device 100, and the cell cutting method can be used in an automatic production line for assembling solar cells, and can also be used in other cell production systems or production devices.

The battery piece cutting method comprises the following steps:

feeding: installing the battery piece 8 on the jig 2, and driving the battery piece 8 on the jig 2 to reach a slotting station below the first laser emission component 4 by the conveying device 3;

grooving: the first laser emitted by the first laser emitting assembly 4 is focused on the cutting path 81 of the cell 8 to perform grooving so as to form a cutting groove; the first laser is pulse laser;

splitting: the conveying device 3 drives the slotted battery piece to reach a splitting station below the second laser emission assembly 5; the second laser emitted by the second laser emitting assembly 5 radiatively heats the slotted battery piece 8 along the corresponding cutting slot so that the battery piece 8 is split along the cutting slot; the second laser is continuous laser;

the first moving device 6 controls the cooling assembly 7 to move in the first direction, so that the cold source sprayed by the nozzle 73 follows the second laser to perform the following cooling on the heating part of the cutting groove of the battery piece 8. It can be understood that the second laser and the cold source sprayed from the nozzle 73 cooperate to generate a temperature difference to form a thermal stress, so that the battery sheet 8 is broken along the cutting path 81 to automatically split the battery sheet 8 into two halves.

In the grooving step and the splitting step, it is not necessary to perform the radiation heating and the cooling source cooling of the second laser after the battery piece 8 is grooved by the first laser irradiation. Conversely, during the movement of the battery piece 8, the first laser can start to drive the battery piece 8 to enter the lower part of the second laser emitting component 5 through the part of the first laser groove by the transportation device 3 to carry out the radiation heating and the cold source cooling of the second laser.

In the above battery piece cutting method, the cutting groove is formed by first grooving the cutting street 81 of the battery piece 8 with the pulsed laser, and the pulse width of the pulsed laser is relatively short and the duty ratio is small, so that the heat affected zone of the battery piece 8 can be reduced; the pulse laser can damage the flatness of the surface of the cell piece 8, so that the absorption rate of the cutting groove of the cell piece 8 to the subsequent continuous laser can be improved; the cold source moves along with the light spots of the continuous laser moving on the battery piece 8 so as to carry out the following cooling on the heating part of the cutting groove of the battery piece 8, the continuous laser and the cold source are combined to generate temperature difference to form thermal stress, and the battery piece 8 is broken along the cutting groove so as to automatically split the battery piece 8 into two parts.

In summary, compared with the prior art, the method for cutting the battery piece at least comprises the following beneficial effects:

according to the battery piece cutting method, the battery piece 8 is directly cut by matching the first laser, the second laser and the cold source, so that the battery piece 8 is directly broken along the cutting channel 81, a mechanical piece breaking process is not needed, the heat damage area caused by the battery piece 8 during cutting can be reduced, the fragment rate in the cutting process is effectively reduced, the overall strength of the battery piece 8 is improved, the section quality and the straightness of the battery piece 8 are improved, and the low-loss cutting of the battery piece 8 is realized.

In some embodiments, the cutting groove formed by the first laser to groove the cutting path 81 of the battery piece 8 has a groove depth ranging from 5 to 30um; it is understood that the grooves of the cutting channels 81 can have a depth of 5um, 10um, 15um, 20um, 25um, 30um, etc. Understandably, the groove depth of the cutting channel 81 is controlled to be between 5 and 30um, so that the cell slice 8 can be prevented from being chipped in the grooving process, the heat affected zone of the cell slice 8 is further reduced, and the absorption rate of the cell slice 8 to subsequent continuous laser is improved.

In some embodiments, in the step of focusing the first laser emitted by the first laser emitting assembly 4 on the cutting street 81 of the cell piece 8 for grooving, the moving speed of the first laser ranges from 1000mm/s to 1800mm/s, and it is understood that the moving speed of the first laser can be 1000mm/s, 1200mm/s, 1400mm/s, 1600mm/s, 1800mm/s, etc.;

in the step of heating the slotted battery piece 8 along the corresponding cutting slot by the second laser emitted from the second laser emitting assembly 5, so as to split the battery piece 8, the moving speed of the second laser is in the range of 400-600 mm/s, and it is understood that the moving speed of the second laser may be 400mm/s, 450mm/s, 500mm/s, 550mm/s, 600mm/s, etc. The moving speed of the first laser is controlled to be between 1000 and 1800mm/s, and the moving speed of the second laser is controlled to be between 400 and 600mm/s, so that the effects of improving the overall strength of the cut battery piece 8 and improving the section quality and the straightness of the battery piece 8 are achieved.

In some embodiments, in the step of cooling the heating portion of the cut groove of the battery piece 8 with the second laser by the cold source sprayed from the nozzle 73, the cold source sprayed from the nozzle 73 is water mist, and the airflow pressure sprayed from the nozzle 73 is in a range of 0.3 to 0.6Mpa, such as 0.3Mpa, 0.4Mpa, 0.5Mpa, 0.6Mpa, or the like; the water flow rate is in the range of 2 to 5ml/min, and may be, for example, 2ml/min, 3ml/min, 4ml/min, 5ml/min, or the like. Understandably, the pressure of the air flow sprayed by the nozzle 73 is controlled between 0.3Mpa and 0.6Mpa, and the water flow is controlled between 2ml/min and 5ml/min, so that the heating part of the cutting channels 81 of the battery piece 8 can achieve good cooling effect, the heat damage area of the battery piece 8 is effectively reduced, and the low-loss cutting of the battery piece 8 is realized.

It is to be understood that the above-described embodiments are merely exemplary of the invention, rather than the full scope of the invention, and that the appended drawings illustrate preferred embodiments of the invention and are therefore not to be considered limiting of its scope. This invention may be embodied in many different forms and the embodiments are provided so that this disclosure will be thorough and complete. Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and modifications can be made, and equivalents may be substituted for elements thereof. All equivalent structures made by using the contents of the specification and the attached drawings of the invention can be directly or indirectly applied to other related technical fields, and all the equivalent structures are within the protection scope of the invention.

Claims

1. A battery piece cutting device is characterized by comprising an installation seat, a conveying device, a first laser emission assembly, a second laser emission assembly, a first moving device, a jig and a cooling assembly;

the mounting seat is vertically arranged and is positioned at the top end of the conveying device; the first laser emission assembly, the second laser emission assembly and the first moving device are all arranged on the mounting base, and the first laser emission assembly and the second laser emission assembly are arranged side by side and are all positioned at the top of the first moving device; the jig can be driven by the conveying device to move in the laser radiation areas of the first laser emission assembly and the second laser emission assembly, and the jig is used for loading the battery piece;

the first moving device is positioned above the jig;

the cooling assembly is arranged on the first moving device in a sliding mode along a first direction; the cooling assembly comprises at least one nozzle, the spout orientation of nozzle the tool, the nozzle can follow from spout spun cold source the second laser is to the battery piece cut the heating position in groove and carry out the retinue cooling and accelerate the automatic lobe of a leaf of battery piece, wherein, first direction is first laser emission subassembly and the parallel direction of second laser emission subassembly, the cutting groove of battery piece carries out the cold source cooling through the heating of second laser radiation.

2. The battery piece cutting device according to claim 1, wherein the first laser emitting assembly comprises a pulse laser and a first galvanometer scanning system, and first laser emitted by the pulse laser can be emitted to the battery piece mounted on the jig after passing through the first galvanometer scanning system;

3. The battery piece cutting device according to claim 1, wherein the jig is slidably disposed on the transportation device in a first direction, and the transportation device is capable of moving linearly in the first direction.

4. The battery piece cutting device according to claim 3, wherein the transporting device includes a second moving device and a third moving device;

the jig is arranged on the second moving device in a sliding mode along a first direction, the second moving device is arranged on the third moving device in a sliding mode along a second direction so that the jig is close to or far away from the mounting base, and the first direction and the second direction are not parallel on the horizontal plane.

5. The battery slice cutting device according to any one of claims 1 to 4, wherein the cooling assembly further comprises a mounting plate and a cold source generating device arranged on the mounting plate; the mounting plate is arranged on the first mobile device in a sliding mode along the first direction, and the cold source generating device is connected with the nozzle.

6. The battery piece cutting device according to claim 5, wherein the cold source generating device comprises a body, at least one air inlet pipe and at least one water inlet pipe; the body is connected with one side, close to the second laser emission component, of the mounting plate, and a cavity is formed in the body; the intake pipe the inlet tube with the nozzle all set up in on the outer wall of body and all with the cavity intercommunication.

7. A battery piece cutting method comprising the battery piece cutting device according to any one of claims 1 to 6, characterized by comprising the steps of:

and (3) splitting: the conveying device drives the slotted battery piece to reach a splitting station below the second laser emission assembly; the second laser emitted by the second laser emitting assembly carries out radiation heating on the slotted battery piece along the corresponding cutting groove so as to split the battery piece along the cutting groove; the second laser is continuous laser;

when the second laser carries out radiant heating to the cut groove of battery piece, first mobile device control cooling module removes in the first direction, makes nozzle spun cold source follows the heating position of the cut groove of second laser to battery piece carries out the retinue cooling, the cut groove of battery piece carries out the cold source cooling through second laser radiant heating simultaneously.

8. The battery piece cutting method according to claim 7, wherein the cutting groove formed by grooving the cutting track of the battery piece with the first laser has a groove depth ranging from 5 to 30um.

9. The method for cutting the battery piece according to claim 7, wherein in the step of focusing the first laser emitted by the first laser emitting assembly on the cutting path of the battery piece for grooving, the moving speed of the first laser is in a range of 1000 to 1800mm/s;

10. The battery piece cutting method according to any one of claims 7 to 9, wherein in the step of cooling the heating part of the cutting groove of the battery piece by the cold source sprayed from the nozzle following the second laser, the cold source sprayed from the nozzle is water mist, the air flow pressure of the water mist sprayed from the nozzle is in a range of 0.3 to 0.6Mpa, and the water flow rate is in a range of 2 to 5ml/min.