阅读说明：本技术 一种电池片低温无损切割装置及方法 (Low-temperature nondestructive cutting device and method for battery piece ) 是由 黄兆威 任天挺 蒋宇 何敏杰 郭绍伟 康乐 秦少国 余凯 于 2021-07-27 设计创作，主要内容包括：本发明公开了一种电池片低温无损切割装置及方法。该装置包括激光切割装置和移料工作台；移料工作台包括弯料吸附板和切割驱动机构。切割驱动机构用于带动弯料吸附板经过激光切割装置的激光照射位置。弯料吸附板包括对吸附板主体、电池片吸盘和上拱支撑条；吸附板主体的中部安装有上拱支撑条。上拱支撑条的长度方向平行于电池片的输送方向。上拱支撑条的两侧均设置有一个或多个吸附口朝上的电池片吸盘。上拱支撑条的顶部边缘高于电池片吸盘。本发明通过将电池片在激光加热前弯曲成轻微拱形,在减小激光功率的情况下实现了电池片的切割,降低了激光切割所需的温度,显著降低了电池片切割过程中受到的损伤。(The invention discloses a low-temperature nondestructive cutting device and method for a battery piece. The device comprises a laser cutting device and a material moving workbench; the material moving workbench comprises a bent material adsorption plate and a cutting driving mechanism. The cutting driving mechanism is used for driving the bent material adsorption plate to pass through the laser irradiation position of the laser cutting device. The bent material adsorption plate comprises an adsorption plate main body, a battery piece sucker and an upper arch support bar; the middle part of the adsorption plate main body is provided with an upper arch supporting strip. The length direction of the upper arch support bars is parallel to the conveying direction of the battery pieces. And one or more battery piece suckers with upward adsorption ports are arranged on both sides of the upper arch support bar. The top edges of the upper arch supporting bars are higher than the battery piece suckers. According to the invention, the battery piece is bent into a slight arch shape before laser heating, so that the battery piece is cut under the condition of reducing the laser power, the temperature required by laser cutting is reduced, and the damage to the battery piece in the cutting process is obviously reduced.)

1. A low-temperature nondestructive cutting device for a battery piece comprises a laser cutting device and a material moving workbench; the method is characterized in that: the material moving workbench is used for conveying cut battery pieces; the laser cutting device is used for carrying out laser irradiation on the cut position of the battery piece; the material moving workbench comprises a bent material adsorption plate and a cutting driving mechanism; the cutting driving mechanism is used for driving the bent material adsorption plate to pass through a laser irradiation position of the laser cutting device; the bent material adsorption plate comprises an adsorption plate main body (1), a battery piece sucker (2) and an upper arch support bar (3); the middle part of the adsorption plate main body (1) is provided with an upper arch support bar (3); the length direction of the upper arch support bars (3) is parallel to the conveying direction of the battery pieces; both sides of the upper arch support bar (3) are provided with one or more battery piece suckers (2) with upward adsorption ports; the top edge of the upper arch supporting strip (3) is higher than the battery piece sucker (2).

2. The low-temperature nondestructive cutting device for the battery piece as claimed in claim 1, wherein: two upper arch supporting strips (3) are arranged on the top surface of the bent material adsorption plate at intervals; the gap between the two upper arch support bars (3) corresponds to the cut position of the battery piece.

3. The low-temperature nondestructive cutting device for the battery piece as claimed in claim 2, wherein: a limiting strip (5) is arranged between the two upper arch supporting strips (3); the limiting strips (5) are used for positioning the distance between the two upper arch supporting strips (3).

4. The low-temperature nondestructive cutting device for the battery piece as claimed in claim 2 or 3, wherein: the top surfaces of the upper arch supporting bars (3) are inclined outwards; the top surface of the upper arch supporting strip (3) forms an included angle of 0.75-1 degrees with the horizontal plane.

5. The low-temperature nondestructive cutting device for the battery piece as claimed in claim 1, 2 or 3, wherein: the height difference of the top edges of the upper arch supporting strips to the suction ports of the battery piece suction cups is the upper arch height; the ratio of the width of the battery piece to the height of the upper arch is 110-140.

6. The low-temperature nondestructive cutting device for the battery piece as claimed in claim 1, 2 or 3, wherein: two adsorption grooves (1-1) are formed in the top surface of the adsorption plate main body (1) in a centering manner; each battery piece sucker (2) is arranged in the adsorption groove (1-1); the adsorption port of the battery piece sucker (2) is flush with the top surface of the bent material adsorption plate; the middle part of the top surface of the adsorption plate main body (1) is provided with a pre-bending installation groove (1-2); the upper arch supporting strip (3) is arranged in the pre-bending mounting groove (1-2).

7. The low-temperature nondestructive cutting device for the battery piece as claimed in claim 1, 2 or 3, wherein: a support strip adjusting plate (4) is arranged between the upper arch support strip (3) and the adsorption plate main body (1); the support strip adjusting plate (4) is connected with the adsorption plate main body (1); the position of the support strip adjusting plate (4) can be adjusted perpendicular to the conveying direction of the battery piece.

8. The low-temperature nondestructive cutting device for the battery piece as claimed in claim 1, 2 or 3, wherein: a cooling liquid recovery groove body is arranged on the material moving workbench; the cooling liquid recovery tank body is lower than the bent material adsorption plate and is used for receiving cooling liquid released in the laser heating process.

9. The low-temperature nondestructive cutting device for the battery piece as claimed in claim 1, 2 or 3, wherein: the bent material adsorption plate and the cutting driving mechanism form a material moving unit; the material moving workbench comprises two material moving units which are arranged side by side; the cutting driving mechanism can drive the bent material adsorption plate to move transversely and vertically; the two material moving units can alternately convey the battery pieces to the laser cutting device; the upper arch support bars (3) on the bent material adsorption plates in the two material moving units correspond to each other in position and can pass through the laser irradiation position of the laser cutting device; one side of the adsorption plate main body (1) is provided with a fixed part (1-3); the fixed part (1-3) is used for installing the bent material adsorption plate on the cutting driving mechanism; the fixed parts (1-3) on the two bent material adsorption plates are positioned on the opposite sides.

10. The low-temperature nondestructive cutting device for the battery piece as claimed in claim 9, wherein: the cutting driving mechanism comprises a transverse moving driving component and a lifting driving component; the transverse moving driving assembly comprises a transverse moving bracket (6), a transverse moving track (7), a sliding block, a synchronous wheel, a synchronous belt (8) and a transverse moving driving motor (9); the transverse moving bracket (6) is fixed on the frame; the two synchronous wheels are supported at two ends of the transverse moving bracket (6) and are connected through a synchronous belt (8); a transverse moving driving motor (9) is arranged on the transverse moving bracket (6), and an output shaft is fixed with one of the synchronizing wheels through a speed reducer; the transverse moving track (7) is fixed on the transverse moving bracket (6); the slide block and the transverse moving track (7) form a sliding pair; the slide block is fixed with a synchronous belt (8); the lifting driving assembly comprises a vertical rail (10), a lifting sliding plate (11), a lifting screw rod and a lifting driving motor (12); the vertical track (10) is fixed on the sliding block; the lifting sliding plate (11) and the vertical track (10) form a sliding pair; a vertically arranged lifting screw rod is supported on the vertical track (10) and forms a screw pair with a nut on the lifting sliding plate (11); the lifting driving motor (12) is fixed on the vertical track (10), and an output shaft is in transmission connection with the lifting screw rod through a gear; the adsorption plate main body (1) is fixed with the top of the lifting sliding plate (11).

11. The low-temperature nondestructive cutting device for the battery piece as claimed in claim 9, wherein: the laser cutting device comprises a base (18), a slotting laser (14) and a heating laser (15); the slotting laser (14) with the downward output port and the heating laser (15) are both installed on the base (18) and are arranged side by side along the conveying direction of the battery piece.

12. The low-temperature nondestructive cutting device for the battery piece as claimed in claim 11, wherein: the grooving laser (14) and the heating laser (15) are respectively used for adjusting the positions in the horizontal direction and the vertical direction through a two-axis adjusting sliding table (19).

13. The low-temperature nondestructive cutting device for the battery piece as claimed in claim 11, wherein: the laser cutting device also comprises an integral position adjusting sliding table (13); the integral position adjusting sliding table (13) is arranged at the top of the base (18) and comprises an adjusting guide rail, a laser mounting sliding plate, an adjusting motor and an adjusting screw rod; two adjusting guide rails which are arranged horizontally and at intervals are fixed on the base (18); the axial direction of the adjusting guide rail is vertical to the axial direction of the transverse moving track (7); the laser installation sliding plate and the two adjusting guide rails form a sliding pair; the adjusting screw rod is supported at the top of the base (18) and forms a screw pair with a nut at the bottom of the laser installation sliding plate; the adjusting motor is fixed on the top of the base (18), and an output shaft is fixed with one end of the adjusting screw rod; the slotting laser (14) and the heating laser (15) are arranged on the laser mounting sliding plate.

14. The low-temperature nondestructive cutting device for the battery piece as claimed in claim 11, wherein: the process of cutting the cell piece is as follows:

dividing two ends of a material moving workbench into a feeding area and a discharging area; the feeding area is used for placing uncut battery pieces on the bent material adsorption plate; the blanking area is used for taking the cut battery piece down from the bent material adsorption plate; the slotting laser (14) is positioned between the heating laser (15) and the feeding area; the cutting driving mechanisms in the two material moving units respectively convey the corresponding bent material adsorption plates to the feeding area and the blanking area, and the bent material adsorption plates in the feeding area are higher than the bent material adsorption plates in the blanking area;

secondly, placing the cut battery pieces on a bent material adsorption plate in a feeding area; the battery piece sucking discs (2) are used for generating suction force by exhausting air, so that two sides of the bottom surface of the battery piece are sucked by the battery piece sucking discs (2), the cut position of the battery piece is supported by the supporting force of the upper arch supporting bars (3), the battery piece is arched, and the cut position of the battery piece is subjected to a pre-applied bending moment;

thirdly, the cutting driving mechanisms in the two material moving units drive the corresponding bent material adsorption plates to move reversely, and the bent material adsorption plates in the feeding area carry the battery pieces to move towards the lower parts of the slotting laser (14) and the heating laser (15); the bent material adsorption plate of the blanking area moves towards the feeding area; when the bent material adsorption plate of the blanking area passes through the lower parts of the slotting laser (14) and the heating laser (15), laser is shielded by the bent material adsorption plate of the loading area carrying the battery piece; therefore, the bent material adsorption plate returning to the feeding area from the blanking area cannot be irradiated by laser;

step four, when two ends of a battery piece carried by the bent material adsorption plate pass through the slotting laser (14), the slotting laser (14) is started, and fracture guide grooves are respectively formed in two ends of the cut position of the battery piece; the heating laser (15) is continuously started, when the battery piece passes below the heating laser (15), the cut position is heated, and the battery piece is bent into an arch shape and is subjected to bending moment, so that the cut position is heated and then is broken along the direction of the breaking guide groove; after the battery piece completely passes through the slotting laser (14) and the heating laser (15), the battery piece is cut along the limiting strip (5);

step five, after the bent material adsorption plate carrying the battery piece reaches a blanking area, manually or automatically taking down the cut battery piece; the bent material adsorption plate reaching the feeding area is driven by the corresponding cutting driving mechanism to rise; the bent material adsorption plate reaching the blanking area is lowered under the driving of the corresponding cutting driving mechanism.

15. A low-temperature nondestructive cutting method for a battery piece is characterized by comprising the following steps: step one, applying downward pressure to two sides of a battery piece, and applying upward supporting force to a middle cut position to enable the battery piece to be arched;

step two, slotting two ends of the cut position of the battery piece by using a slotting laser; heating the cut position of the battery piece by using a heating laser; since the battery sheet is bent in an arch shape and is subjected to a bending moment, the battery sheet is heated by the cutting position and then is broken in the direction of the breaking guide groove.

16. The low-temperature nondestructive cutting method for the battery piece as claimed in claim 15, wherein: the depth of grooves formed in the two ends of the cut position of the cell piece by the grooving laser is 8-40% of the thickness of the cell piece; the length of the fracture guide groove is 2-3 mm.

17. The low-temperature nondestructive cutting method for the battery piece as claimed in claim 15, wherein: the working power of the slotting laser is 40-60W, and the working power of the heating laser is 150-165W.

18. The low-temperature nondestructive cutting method for the battery piece as claimed in claim 15, wherein: the cut position of the battery piece is heated to 140-200 ℃ under the heating of the heating laser.

Technical Field

The invention belongs to the technical field of battery piece cutting, and particularly relates to a low-temperature nondestructive cutting method and device for a battery piece.

Background

In the traditional laser cutting of the battery piece, a deep groove is formed in the battery piece, and then the battery piece is broken through a mechanical piece breaking device. The cutting form has three disadvantages, one is that the pulse laser with high peak power melts or gasifies the surface of the cell along the cutting line, so that the photoelectric conversion efficiency of the cell is reduced; secondly, a large amount of dust is generated in the cutting process, and when a workshop is filled with a large amount of dust, potential safety hazards exist, and explosion can be caused, so that each battery piece laser cutting device has to be provided with a dust removal cabinet, and a component production workshop also has to be provided with a corresponding dust removal device; the third disadvantage is that the laser cuts grooves with a depth of about 50% along the whole dividing line, which itself reduces the strength of the cell, and the subsequent mechanical breaking may further damage the cell.

The main component of the solar cell is silicon, and according to the characteristics of the silicon, the silicon is rapidly heated and rapidly cooled at a certain temperature in a small range, so that internal stress can be generated in the silicon, and the silicon can be cracked when the internal stress is large enough. The cutting mode effectively solves the problem of the traditional cutting mode, has obvious advantages compared with the traditional mode in the aspect of cell loss, and therefore, the nondestructive cutting mode that laser and water spray simultaneously act on the cell is widely applied. The cutting mode has the same defects that for part of the battery pieces with special specifications, the laser power for cutting the battery pieces is high, and the battery pieces are easily damaged due to overhigh temperature during cutting; and the other disadvantage is that a drying structure is required to be added to dry the battery piece after water spraying and cooling. For this reason, a low-temperature nondestructive cutting scheme for the battery plate needs to be designed.

Disclosure of Invention

The invention aims to provide a low-temperature nondestructive cutting method and a device for a battery piece. Comprises an adsorption plate main body, a slotting laser mechanism and a heating laser mechanism.

The invention relates to a low-temperature nondestructive cutting device for a battery piece, which comprises a laser cutting device and a material moving workbench; the material moving workbench is used for conveying the cut battery pieces; the laser cutting device is used for carrying out laser irradiation on the cut position of the battery piece. The material moving workbench comprises a bent material adsorption plate and a cutting driving mechanism. The cutting driving mechanism is used for driving the bent material adsorption plate to pass through the laser irradiation position of the laser cutting device. The bent material adsorption plate comprises an adsorption plate main body, a battery piece sucker and an upper arch support bar; the middle part of the adsorption plate main body is provided with an upper arch supporting strip. The length direction of the upper arch support bars is parallel to the conveying direction of the battery pieces. And one or more battery piece suckers with upward adsorption ports are arranged on both sides of the upper arch support bar. The top edges of the upper arch supporting bars are higher than the battery piece suckers.

Preferably, the top surface of the bent material adsorption plate is provided with two upper arch supporting strips at intervals. The gap between the two upper arch support bars corresponds to the cut position of the battery piece.

Preferably, a limiting strip is arranged between the two upper arch supporting strips. The limiting strips are used for positioning the distance between the two upper arch supporting strips.

Preferably, the top surfaces of the upper arch supporting bars are inclined outwards; the top surface of the upper arch supporting strip forms an included angle of 0.75-1 degrees with the horizontal plane.

Preferably, the height difference between the top edges of the upper arch supporting strips and the suction ports of the battery piece suction cups is the upper arch height. The ratio of the width of the battery piece to the height of the upper arch is 110-140.

Preferably, two adsorption grooves are formed in the top surface of the adsorption plate main body in a centering mode. Each battery piece sucking disc is installed in the adsorption tank. The adsorption port of the battery piece sucker is flush with the top surface of the bent material adsorption plate. The middle part of adsorption plate main part top surface is seted up the preflex mounting groove. The upper arch supporting strip is arranged in the pre-bending mounting groove.

Preferably, a support strip adjusting plate is arranged between the upper arch support strip and the adsorption plate main body. The support bar adjusting plate is connected with the adsorption plate main body. The position of the support bar adjusting plate can be adjusted perpendicular to the conveying direction of the battery piece.

Preferably, a cooling liquid recovery groove body is arranged on the material moving workbench. The cooling liquid recovery tank body is lower than the bent material adsorption plate and is used for receiving cooling liquid released in the laser heating process.

Preferably, the bent material adsorption plate and the cutting driving mechanism form a material moving unit. The material moving workbench comprises two material moving units which are arranged side by side. The cutting driving mechanism can drive the bent material adsorption plate to move transversely and vertically. The two material moving units can alternately convey the battery piece to the laser cutting device. The upper arch support bars on the inner bent material adsorption plates of the two material moving units correspond in position and can pass through the laser irradiation position of the laser cutting device. One side of the adsorption plate main body is provided with a fixed part; the fixed part is used for installing the bent material adsorption plate on the cutting driving mechanism. The fixed parts on the two bent material adsorption plates are positioned on the opposite sides.

Preferably, the cutting driving mechanism comprises a transverse moving driving assembly and a lifting driving assembly. The transverse moving driving assembly comprises a transverse moving support, a transverse moving track, a sliding block, a synchronous wheel, a synchronous belt and a transverse moving driving motor. The transverse moving bracket is fixed on the frame. Two synchronous wheels are supported at two ends of the transverse moving bracket and are connected through a synchronous belt. The transverse moving driving motor is installed on the transverse moving support, and the output shaft is fixed with one of the synchronizing wheels through the speed reducer. The transverse moving rail is fixed on the transverse moving bracket. The slide block and the transverse moving track form a sliding pair. The slide block is fixed with the synchronous belt. The lifting driving assembly comprises a vertical rail, a lifting sliding plate, a lifting screw rod and a lifting driving motor. The vertical track is fixed on the sliding block. The lifting slide plate and the vertical track form a sliding pair. The vertically arranged lifting screw rod is supported on the vertical track and forms a screw pair with the nut on the lifting sliding plate. The lifting driving motor is fixed on the vertical track, and the output shaft is in transmission connection with the lifting lead screw through a gear. The main body of the adsorption plate is fixed with the top of the lifting slide plate.

Preferably, the laser cutting device comprises a base, a grooving laser and a heating laser. The slotted laser with the downward output port and the heating laser are both installed on the base and are arranged side by side along the conveying direction of the battery piece.

Preferably, the slotting laser and the heating laser respectively adjust the horizontal and vertical positions through two-axis adjusting sliding tables.

Preferably, the laser cutting device further comprises an integral position adjusting sliding table. The integral position adjusting sliding table is arranged at the top of the base and comprises an adjusting guide rail, a laser mounting sliding plate, an adjusting motor and an adjusting lead screw. Two adjusting guide rails which are arranged horizontally and at intervals are fixed on the base. The axial direction of the adjusting guide rail is perpendicular to the axial direction of the transverse moving track. The laser installation sliding plate and the two adjusting guide rails form a sliding pair. The adjusting screw rod is supported at the top of the base and forms a screw pair with a nut at the bottom of the laser installation sliding plate. The adjusting motor is fixed at the top of the base, and the output shaft is fixed with one end of the adjusting screw rod. The grooving laser and the heating laser are arranged on the laser mounting sliding plate.

Preferably, the process of cutting the battery piece by the low-temperature nondestructive cutting device for the battery piece is as follows:

step one, dividing two ends of a material moving workbench into a feeding area and a discharging area. The feeding area is used for placing uncut battery pieces on the bent material adsorption plate; and the blanking area is used for taking down the bent material adsorption plate from the cut battery piece. The slotting laser is positioned between the heating laser and the feeding area. The cutting driving mechanisms in the two material moving units respectively convey the corresponding bent material adsorption plates to the feeding area and the blanking area, and the bent material adsorption plates in the feeding area are higher than the bent material adsorption plates in the blanking area.

And step two, placing the cut battery pieces on a bent material adsorption plate in a feeding area. The battery piece sucking discs are used for generating suction force by air suction, so that two sides of the bottom surface of the battery piece are sucked by the battery piece sucking discs, the cut position of the battery piece is supported by the supporting force of the upper arch supporting bars, the battery piece is arched, and the cut position of the battery piece is subjected to a pre-applied bending moment.

Thirdly, the cutting driving mechanisms in the two material moving units drive the corresponding bent material adsorption plates to move reversely, and the bent material adsorption plates in the feeding area carry the battery pieces to move towards the lower parts of the slotting laser and the heating laser; the bent material adsorption plate in the blanking area moves towards the feeding area. When the bent material adsorption plate of the blanking area passes through the lower part of the slotting laser and the heating laser, laser is shielded by the bent material adsorption plate of the loading area carrying the battery piece; therefore, the bent material adsorption plate returning to the feeding area from the blanking area can not be irradiated by laser.

And step four, when two ends of the battery piece carried by the bent material adsorption plate pass through the slotting laser, the slotting laser is started, and fracture guide grooves are respectively formed in two ends of the cut position of the battery piece. The heating laser is continuously started, when the battery piece passes through the lower part of the heating laser, the cut position is heated, and the battery piece is bent into an arch shape and is subjected to bending moment, so that the battery piece is broken along the direction of the breaking guide groove after being heated by the cut position. After the battery piece passes through the grooving laser and the heating laser completely, the battery piece is cut along the limiting strips.

And step five, manually or automatically taking down the cut battery pieces after the bent material adsorption plate carrying the battery pieces reaches the blanking area. The bent material adsorption plate reaching the feeding area is driven by the corresponding cutting driving mechanism to be lifted; and the bent material adsorption plate reaching the blanking area is lowered under the driving of the corresponding cutting driving mechanism.

A low-temperature nondestructive cutting method for a battery piece comprises the following specific steps:

step one, downward pressure is applied to the two sides of the battery piece, and upward supporting force is applied to the middle cut position, so that the battery piece is in an arch shape.

And step two, slotting two ends of the cut position of the battery piece by using a slotting laser. And heating the cut position of the battery piece by using a heating laser. Since the battery sheet is bent in an arch shape and is subjected to a bending moment, the battery sheet is heated by the cutting position and then is broken in the direction of the breaking guide groove.

Preferably, the depth of grooves formed in the two ends of the cut position of the cell piece by the grooving laser is 8-40% of the thickness of the cell piece; the length of the fracture guide groove is 2-3 mm.

Preferably, the working power of the slotting laser is 40-60W, and the working power of the heating laser is 150-165W.

Preferably, the cut position of the cell piece is heated to 140 to 200 ℃ by the heating laser.

The invention has the beneficial effects that:

1. according to the invention, the battery piece is bent into a slight arch shape before laser heating, so that the battery piece is cut under the condition of reducing the laser power, the temperature required by laser cutting is reduced, and the damage to the battery piece in the cutting process is obviously reduced; specifically, when the laser cutting is carried out, a 300W heating laser can complete cutting by using 50% of power, the temperature of a battery piece only needs to reach about 150 ℃, and the damage to the battery piece is small; when the prior art is used for cutting, a 300W heating laser needs to use 80% of power to complete cutting, and the temperature of a battery piece only needs to reach about 250 ℃, so that the battery piece is easily seriously damaged.

2. The invention reduces the requirement of laser cutting of the battery piece, applies bending moment to the battery piece in advance, and replaces the internal stress of the battery piece, thereby realizing the cutting of the battery piece without using cooling liquid.

3. The laser grooving depth of the invention only needs to reach 10% of the thickness of the battery piece, so that the accurate cutting of the battery piece can be ensured, compared with the grooving depth of 50% in the traditional mode, the laser grooving depth can obviously reduce the damage to the battery piece, improve the strength of the cut battery piece and reduce the dust generated during cutting.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of a material moving table according to the present invention;

FIG. 3 is a schematic view of a bending adsorption plate according to the present invention;

fig. 4 is a schematic view of a laser cutting apparatus according to the present invention.

Detailed Description

The invention is further described below with reference to the accompanying drawings.

As shown in fig. 1 and 2, the low-temperature nondestructive cutting device for the battery piece comprises a laser cutting device I and a material moving workbench II; the material moving workbench II is used for conveying the cut battery pieces; and the laser cutting device I is used for carrying out laser grooving at two ends and integral laser heating on the battery piece. And the material moving workbench II comprises a cooling liquid recovery tank body and two material moving units arranged side by side. The cooling liquid recovery tank bodies are arranged on the two material moving units and used for receiving cooling liquid. The material moving unit comprises a cutting driving mechanism and a bent material adsorption plate. The bent material adsorption plate is arranged on the cutting driving mechanism. The cutting driving mechanism can drive the bent material adsorption plate to move transversely and vertically. The transverse movement is used for driving the bent material adsorption plate to pass through the lower part of the laser cutting device, so that the laser cutting of the battery piece is realized, and the transverse movement direction is the conveying direction of the battery piece. Vertical removal is used for making two curved material adsorption plates that move in the material unit can stagger in vertical direction, avoids the cutting of two curved material adsorption plates and the in-process that resets to take place to interfere. Two move the material unit and can carry the battery piece to laser cutting device I in turn.

As shown in fig. 3, the bent material adsorption plate comprises an adsorption plate main body 1, a battery piece sucker 2, an upper arch support bar 3, a support bar adjusting plate 4 and a limit bar 5; two adsorption grooves 1-1 are arranged on the top surface of the adsorption plate main body 1 in a centering way. The length direction of the adsorption groove 1-1 is parallel to the conveying direction of the battery piece (namely the transverse moving direction of the bent material adsorption plate). A plurality of cell sucking discs 2 which are arranged in sequence at equal intervals are arranged in the two adsorption grooves 1-1. The adsorption port of the battery piece sucker 2 is arranged upwards and is flush with the top surface of the bent material adsorption plate. The middle part of the top surface of the adsorption plate main body 1 is provided with a pre-bending installation groove 1-2. Four waist-shaped holes which are arranged in a rectangular shape are formed in the pre-bending mounting groove 1-2. Through holes on four corners of the support bar adjusting plate 4 are respectively connected with waist-shaped holes on the pre-bending mounting grooves 1-2 through bolts and nuts. The waist-shaped holes enable the support strip adjusting plates 4 to be positionally adjusted perpendicular to the cell conveying direction.

The central position of the top surface of the adsorption plate main body 1 is fixed with a limit strip 5 through a bolt. The two sides of the limiting bar 5 are fixed with the upper arch supporting bars 3. The top surface of the limiting strip 5 is lower than the top edge of the upper arch supporting strip 3. The axial direction of the upper arch supporting strip 3 is parallel to the transverse moving direction of the bent material adsorption plate. The top surfaces of the upper arch supporting strips 3 are inclined towards the outside (the side far away from the limiting strips 5); the top surface of the upper arch supporting strip 3 forms an included angle of 0.75-1 degrees with the horizontal plane. The top edge of the upper arch supporting strip 3 is higher than the top surface of the adsorption plate main body 1. One side of the adsorption plate main body 1 is provided with a fixed part 1-3; the fixed part 1-3 is used for installing the bent material adsorption plate on the cutting driving mechanism. When the battery piece is placed on the adsorption plate main body 1 and is adsorbed by the battery piece sucker 2, the two sides of the battery piece are attached to the top surface of the adsorption plate main body 1. The middle position of the battery piece is supported by the two upper arch supporting strips 3, so that the battery piece is in an upper arch shape, and the arch top is coincided with the cut position.

The height difference of the top edges of the upper arch supporting strips to the suction ports of the battery piece suction cups is the upper arch height; when the width of the battery piece is 210mm, the height of the upper arch is 1.5 mm; when the width of the battery piece is 182mm, the height of the upper arch is 1.3 mm. The ratio of the width of the battery piece to the height of the upper arch ranges from 110:1 to 140: 1. The heating laser power required for breaking the corresponding cell piece is 165W (55% of 300W) when the ratio is 140:1, and the heating laser power required for breaking the corresponding cell piece is 150W (50% of 300W instead) when the ratio is 110: 1. The included angle of the top surface of the upper arch supporting strip 3 relative to the horizontal plane corresponds to the upper arch degree in the battery piece cutting process, so that the top surface of the upper arch supporting strip 3 can more fully support the battery piece, and the battery piece is prevented from being only contacted with the line of the upper arch supporting strip 3.

The cutting driving mechanism comprises a transverse moving driving assembly and a lifting driving assembly. The transverse moving driving assembly comprises a transverse moving bracket 6, a transverse moving track 7, a sliding block, a synchronous wheel, a synchronous belt 8 and a transverse moving driving motor 9. The transverse moving bracket 6 is fixed on the frame. Two synchronous wheels are supported at two ends of the transverse moving bracket 6 and are connected through a synchronous belt 8. The transverse moving driving motor 9 is installed on the transverse moving support 6, and an output shaft is fixed with one of the synchronizing wheels through a speed reducer. The traverse rail 7 is fixed to the traverse bracket 6. The slide block and the transverse moving track 7 form a sliding pair. The slide block is fixed with a synchronous belt 8.

The lifting driving assembly comprises a vertical rail 10, a lifting sliding plate 11, a lifting screw rod and a lifting driving motor 12. The vertical rail 10 is fixed to the slider. The lifting slide plate 11 and the vertical rail 10 form a sliding pair. The vertically arranged lifting screw is supported on the vertical track 10 and forms a screw pair with a nut on the lifting sliding plate 11. The lifting driving motor 12 is fixed on the vertical track 10, and the output shaft is connected with the lifting screw rod through gear transmission. The lifting slide plate 11 is driven by the rotation of the lifting drive motor 12 to carry out lifting adjustment. The fixed part 1-3 on the main body 1 of the adsorption plate is fixed with the top of the lifting slide plate 11.

The limiting strips of the bent material adsorption plates in the two material moving units are positioned on the same vertical plane. The transverse moving rails 7 in the two material moving units are positioned on the opposite sides of the two material moving units, so that the fixing parts 1-3 on the two bent material adsorption plates are positioned on the opposite sides, and when the two bent material adsorption plates are staggered in the height direction, the relative movement cannot be interfered.

As shown in fig. 4, the laser cutting apparatus i includes a base 18, an integral position adjusting slide table 13, a grooving laser 14, a heating laser 15, a two-axis adjusting slide table 19, a cooling water shower head 16, and a shower head position adjusting table 17. The base 18 is fixed to the frame. The integral position adjusting sliding table 13 is arranged at the top of the base 18 and comprises an adjusting guide rail, a laser mounting sliding plate, an adjusting motor and an adjusting screw rod. Two adjusting rails which are arranged horizontally and at a distance from each other are fixed on the base 18. The axial direction of the adjustment guide rail is perpendicular to the axial direction of the traverse rail 7. The laser installation sliding plate and the two adjusting guide rails form a sliding pair. The adjusting screw rod is supported on the top of the base 18 and forms a screw pair with a nut at the bottom of the laser installation sliding plate. The adjusting motor is fixed on the top of the base 18, and the output shaft is fixed with one end of the adjusting screw rod.

The grooving laser 14 and the heating laser 15 are mounted on the end of the laser mount sled by means of a two-axis adjustment sled 19, respectively. The laser output ports of the slotting laser 14 and the heating laser 15 are all arranged downwards and are located right above the material moving workbench II. The grooving laser 14 and the heating laser 15 are arranged side by side along the cell conveying direction. The two-axis adjusting sliding table 19 adopts an XZ two-axis manual micrometer sliding table, belongs to the prior art, and is not described herein. The two adjusting directions of the two-axis adjusting sliding table 19 are respectively a horizontal direction and a vertical direction perpendicular to the conveying direction of the battery piece. Two-axis adjustment slides 19 are used to adjust the height of the grooving laser 14, the heating laser 15, and the cutting position, respectively.

And the cooling water spray head 16 is arranged on the lower side of the laser mounting sliding plate through a spray head position adjusting platform 17, faces to the position right below the grooving laser 14 and the heating laser 15, and is used for spraying cooling water at the grooving and heating positions. The position and orientation of the cooling water shower 16 can be adjusted. Since the present invention bends the cut cell sheet into an arch shape, thereby significantly reducing the temperature required for heating, the present invention can eliminate the use of cooling water during the cutting of the cell sheet, i.e., the cooling water header 16 is not an essential feature.

And the two ends of the material moving workbench II are respectively a feeding area and a discharging area. The feeding area is used for placing uncut battery pieces on the bent material adsorption plate; and the blanking area is used for taking down the bent material adsorption plate from the cut battery piece. The grooving laser 14 is located between the heating laser 15 and the loading zone.

The cutting method of the low-temperature nondestructive cutting device for the battery piece comprises the following specific steps:

adjusting the positions of support bar adjusting plates 4 on the two bent material adsorption plates to enable the position limiting strips 5 to be consistent with the cut positions (namely the center lines of the battery pieces) of the battery pieces; the positions of the slotting laser 14 and the heating laser 15 are respectively adjusted through the two-axis adjusting sliding tables 19, so that the slotting laser 14, the heating laser 15 and the battery piece are aligned to the cutting position, and the height reaches the preset requirement. And adjusting the spray head position adjusting table 17 to spray cooling water to the cut position of the battery piece. The cutting driving mechanisms in the two material moving units respectively convey the corresponding bent material adsorption plates to the feeding area and the blanking area, and the bent material adsorption plates in the feeding area are higher than the bent material adsorption plates in the blanking area.

And step two, grabbing the cut battery pieces through a manipulator after the vision station of the feeding equipment is positioned, and placing the battery pieces on a bent material adsorption plate in a feeding area. The battery piece sucking discs 2 are exhausted to generate suction, the manipulator of the feeding device presses the cut battery pieces, so that the two sides of the bottom surfaces of the battery pieces are sucked by the battery piece sucking discs 2, the cut positions of the battery pieces are supported by the upper arch support bars 3 to form arches, and the cut positions of the battery pieces are subjected to pre-applied bending moment.

Thirdly, the cutting driving mechanisms in the two material moving units respectively drive the corresponding bent material adsorption plates to move reversely, and the bent material adsorption plates in the feeding area carry the battery pieces to move towards the lower parts of the slotting laser 14 and the heating laser 15; the bent material adsorption plate in the blanking area moves towards the feeding area.

When the bent material adsorption plate of the blanking area passes through the lower parts of the slotting laser 14 and the heating laser 15, laser is shielded by the bent material adsorption plate of the loading area carrying the battery piece; therefore, the bent material adsorption plate returning to the feeding area from the blanking area can not be irradiated by laser.

And step four, when two ends of the battery piece carried by the bent material adsorption plate pass through the slotting laser 14, the slotting laser 14 is started, the working power is 50W (full power work), and two ends of the cut position of the battery piece are respectively provided with a fracture guide groove. The depth of the fracture guide groove is 10% of the thickness of the battery piece; the length of the fracture guide groove is 2-3 mm. I.e., the slot laser 14 is activated twice during the passage of each cell under the slot laser 14. The slot laser 14 is turned off when the middle of the cell passes directly below the slot laser 14.

The heating laser 15 is continuously started, the working power is 150W-165W (50% -55% of 300W), when the battery piece passes below the heating laser 15, the stability of the cut position is reduced by the heating structure, and the battery piece is bent into an arch shape and is subjected to bending moment, so that the battery piece is heated at the cut position and then is broken along the direction of the breaking guide groove.

After passing completely through the grooving laser 14 and the heating laser 15, the battery piece is cut along the stopper bar 5.

And step five, after the bent material adsorption plate carrying the battery piece reaches the blanking area, taking down the battery piece cut by the blanking equipment. The bent material adsorption plate reaching the feeding area is driven by the corresponding cutting driving mechanism to rise; the bent material adsorption plate reaching the blanking area is lowered under the driving of the corresponding cutting driving mechanism.

And the positions of the two bent material adsorption plates are exchanged, and the battery piece can be continuously cut by repeating the steps from two to five.

In the cutting process, for the type of the battery piece which needs special cooling protection, the cooling water spray head 16 is started to cool the laser heating position. Because the temperature of laser heating in the invention is lower than that in the prior art, the invention does not need to start the cooling water spray head 16 in most cutting operations, thereby obviously reducing the cost.