CN113618240B

CN113618240B - Laser welding equipment for lithium battery explosion-proof valve

Info

Publication number: CN113618240B
Application number: CN202110951508.XA
Authority: CN
Inventors: 方友胜; 曾燕飞
Original assignee: Shenzhen Shangtuo Laser Technology Co ltd
Current assignee: Shenzhen Shangtuo Laser Technology Co ltd
Priority date: 2021-08-19
Filing date: 2021-08-19
Publication date: 2023-02-28
Anticipated expiration: 2041-08-19
Also published as: CN113618240A

Abstract

The invention discloses a laser welding device for an explosion-proof valve of a lithium battery. The laser welding equipment includes laser welding device, link joint conveyer belt and cooling and drying device, and the laser welding device includes casing and laser welding ware, and the casing is internal to be cut apart to have welding chamber and time green house, and the laser welding ware is installed in the welding chamber, and the casing is worn to establish by the link joint conveyer belt, and the link joint conveyer belt passes the welding chamber in proper order and time green house. The cooling and drying device comprises an airflow pipe, the airflow pipe comprises a cooling branch pipe and a heating branch pipe, the cooling branch pipe is communicated with the welding chamber, and the heating branch pipe is communicated with the temperature returning chamber. The cooling and drying device cools and dries the air, and leads the welding chamber through the cooling branch pipe, thereby reducing the temperature of the welding chamber and being beneficial to cooling of the laser welding device and the lithium battery component. The dry gas is heated and is introduced into the temperature return chamber through the heating branch pipe, the lithium battery component is conveyed to the temperature return chamber from the welding chamber, liquefied water is not easily formed on the surface of the lithium battery component, and therefore the production quality of the lithium battery is improved.

Description

Laser welding equipment for lithium battery explosion-proof valve

Technical Field

The invention relates to the field of laser welding, in particular to laser welding equipment for an explosion-proof valve of a lithium battery.

Background

Laser welding is an efficient precision welding method using a laser beam with high energy density as a heat source. The lithium battery explosion-proof valve is used as a pressure relief device of a lithium battery and is usually fixed on a lithium battery pack by using a laser welding device.

In the correlation technique, for reducing the welding temperature too high, lead to other parts of lithium cell or soldered connection influence by heat performance, can utilize low temperature atomizing steam to carry out cooling to butt joint and working face.

With respect to the above related art, the inventors consider that: the water vapor in the production environment of the lithium battery is increased, so that the reaction of water molecules and lithium ions in the lithium battery can be caused, the content of the lithium ions in the lithium battery is reduced, and the production quality of the lithium battery is reduced.

Disclosure of Invention

In order to improve lithium cell production quality, this application provides a lithium cell explosion-proof valve laser welding equipment.

The application provides a lithium cell explosion-proof valve laser welding equipment adopts following technical scheme:

the utility model provides a lithium cell explosion-proof valve laser welding equipment includes laser welding device, is used for carrying the link joint conveyer belt of lithium cell part and is used for carrying the cooling drying device of cooling drying gas for laser welding device, laser welding device includes casing and laser welding ware, it is a plurality of cavities, a plurality of to cut apart into in the casing the cavity includes welding chamber and temperature return room, the laser welding ware is installed in the welding chamber, the casing is worn to establish by the link joint conveyer belt, and the straight section that the link joint conveyer belt kept away from ground passes the welding chamber in proper order and returns the temperature chamber, cooling drying device includes the air current pipe, the air current pipe includes cooling branch pipe and heating branch pipe, cooling branch pipe and welding chamber intercommunication, heating branch pipe and temperature return room intercommunication.

Through adopting above-mentioned technical scheme, the cooling and drying device with air cooling and drying, the air after the cooling and drying lets in the welding chamber through cooling branch pipe to reduced the temperature of welding chamber, during the explosion-proof valve of laser welding, the indoor temperature of locating is lower, does benefit to the soldered connection and the lithium cell part cooling of laser welder, and lets in dry air in the cavity, and is less to lithium cell performance influence. The dried gas is heated and is led into the temperature returning chamber through the heating branch pipe, the temperature of the lithium battery part is gradually increased from the welding chamber to the temperature returning chamber, and the gas in the temperature returning chamber is dried, so that liquefied water is not easily formed on the surface of the lithium battery part, the probability of reaction of lithium ions and water in the lithium battery part is reduced, and the production quality of the lithium battery is improved.

Optionally, the laser welding equipment still includes the seal assembly who is used for the gaseous convection current of separation, seal assembly is including sealed piece and the division board that is used for cutting apart each cavity, division board and casing fixed connection, correspond on division board and the casing and set up the perforation of offering the straight section that supplies lithium cell part and link joint conveyer belt to keep away from ground and pass through, sealed piece and link joint conveyer belt fixed connection, sealed piece slides with fenestrate pore wall seal and is connected.

Through adopting above-mentioned technical scheme, the division board separates each cavity to reduced weld chamber and the room air convection that returns the warm braw, caused the probability that weld chamber temperature rose. The sealing blocks fill the gap between the link plate conveyor belt and the perforated side wall, thereby reducing the probability that the link plate conveyor belt brings outside air containing moisture into the welding chamber.

Optionally, two blocking blocks are arranged in the shell, one blocking block is located at one end, entering the shell, of the lithium battery component, the other blocking block is located at one end, leaving the shell, of the lithium battery component, the blocking blocks are fixedly connected with the bottom wall of the through hole, and the blocking blocks are abutted to the chain plate conveying belt.

Through adopting above-mentioned technical scheme, the straight section that the link joint conveyer belt kept away from ground passes through from the perforation, and the separation piece is with the space filling between link joint conveyer belt and the perforation diapire to the probability that the link joint conveyer belt carried the moisture and got into the welding chamber has been reduced.

Optionally, the seal assembly further comprises a plurality of seal turnplates, each seal turnplate comprises a rotating shaft, a plurality of fan blades and a telescopic sealing plate in one-to-one correspondence with the fan blades, the rotating shaft is connected with the perforated hole wall in a rotating mode, the axial direction of the rotating shaft is perpendicular to the conveying direction of the chain plate conveying belt, a driving assembly used for driving the rotating shaft to rotate is arranged on the shell, the fan blades are evenly arranged on the circumferential direction of the rotating shaft, the fan blades are fixedly connected with the rotating shaft, the telescopic sealing plate slides and is connected with the fan blades along the direction close to or far away from the rotating shaft, a driving piece used for driving the telescopic sealing plate to slide is arranged on each fan blade, a sealing plate is fixedly connected onto the perforated top wall, the telescopic sealing plate can be abutted against the sealing plate, and the telescopic sealing plate can be abutted against the chain plate conveying belt.

By adopting the technical scheme, the rotating shaft rotates when the lithium battery component moves on the chain plate conveyor belt, and the lithium battery component passes between the two fan blades. The telescopic sealing plate can be abutted against the sealing plate and also can be abutted against a chain plate conveyor belt, so that intermittent closed perforation is realized, and the probability of gas convection of two adjacent cavities is reduced.

Optionally, the cooling and drying device further includes a cooling mechanism, a cooling chamber and a cooling pipe, an air inlet and an air outlet are formed in the cooling chamber, the airflow pipe is communicated with the air outlet, the air inlet is communicated with an air blower, the cooling pipe is fixedly arranged in the cooling chamber, and the cooling pipe is communicated with the cooling mechanism.

Through adopting above-mentioned technical scheme, the coolant liquid of cooling body preparation lets in the cooling tube to make the cooling tube give off cold air to the cooling chamber, the air that the air-blower let in passes through the aftercooling in the cooling chamber, and the moisture in the air is at the liquefaction of cooling tube surface, breaks away from gas, thereby realizes getting into the purpose of air cooling drying.

Optionally, the cooling tube includes cladding pipe and liquid flow pipe, liquid flow pipe and cooling body intercommunication, the cladding pipe box is established in the outside of liquid flow pipe to with liquid flow pipe fixed connection, set up the lime set chamber that supplies the moisture to reach the liquid flow pipe outer wall on the cladding pipe, the axis in lime set chamber and the axial contained angle setting of liquid flow pipe, and the accent in lime set chamber is towards the air inlet.

Through adopting above-mentioned technical scheme, the temperature on liquid flow pipe surface is far less than the temperature on cladding tube surface, and partial air arrives the liquid flow pipe surface by the lime set chamber, and the moisture in the air is at the liquefaction of liquid flow pipe surface, and the cladding tube surface has seldom liquefied water to the probability that the liquefied water on air with the cooling tube surface of cool drying goes into the gas flow pipe has been reduced.

Optionally, the cladding pipe and the liquid flow pipe are arranged at intervals, a guide pipe for guiding out the liquefied water is connected to the cooling pipe, and the guide pipe penetrates through the side wall of the cooling chamber.

Through adopting above-mentioned technical scheme, the liquefied water flows downwards along the liquid flow pipe to enter the honeycomb duct, the honeycomb duct is with liquefied water cooling chamber, reduces the probability that liquefied water is detained in the cooling chamber, leads to the increase of humidity in the cooling chamber.

Optionally, a liquid return pipe for recovering liquid in the liquid flow pipe is connected to the cooling pipe, the liquid return pipe is communicated with the liquid flow pipe, and the liquid return pipe penetrates through a side wall of the cooling chamber and is communicated with the cooling mechanism.

Through adopting above-mentioned technical scheme, return the liquid pipe and lead into cooling body again with the interior liquid that heats up gradually of cooling tube to make cooling body, cooling tube and return and form the closed loop between the liquid pipe, the coolant liquid keeps the low temperature throughout in the cooling tube, has increased the dry probability of air cooling in the cooling chamber.

Optionally, the plurality of chambers further include a pre-cooling chamber, the pre-cooling chamber is located behind the welding chamber along the conveying direction of the chain plate conveyor belt, the cooling branch pipe is communicated with the pre-cooling chamber, an air return pipe is connected in the pre-cooling chamber, the air return pipe penetrates through the side wall of the pre-cooling chamber and is communicated with the cooling chamber, and a one-way vent valve for allowing air to flow from the pre-cooling chamber to the cooling chamber is arranged in the air return pipe.

By adopting the technical scheme, the pre-cooling chamber isolates the welding chamber from the space outside the shell, so that the probability of exchanging air in the welding chamber with air outside the shell is reduced, and the probability of moisture in the external air entering the welding chamber is reduced. The moisture and the temperature of the gas in the pre-cooling chamber are lower than those of the external air, so that the gas in the pre-cooling chamber is recycled, and the efficiency of cooling and drying the gas in the cooling chamber is improved.

Optionally, the plurality of chambers further comprises a transition chamber, the transition chamber is located in front of the welding chamber and the transition chamber is located behind the temperature returning chamber along the conveying direction of the chain plate conveyor belt.

By adopting the technical scheme, the pre-cooling chamber is positioned between the welding chamber and the tempering chamber, so that the probability of temperature rise of the welding chamber caused by temperature transfer between the welding chamber and the tempering chamber is reduced.

Optionally, be provided with the fixed establishment that is used for fixed lithium battery pack in the welding chamber, fixed establishment includes horizontal pneumatic cylinder and two-way centre gripping pneumatic cylinder, the lateral wall fixed connection of the cylinder body of horizontal pneumatic cylinder and welding chamber, the piston rod of horizontal pneumatic cylinder removes to the direction of being close to or keeping away from the link joint conveyer belt, the cylinder body of two-way centre gripping pneumatic cylinder and the piston rod fixed connection of horizontal pneumatic cylinder, equal fixedly connected with butt joint board, two on two piston rods of the two-way pneumatic cylinder of centre gripping all can contradict with lithium cell component.

Through adopting above-mentioned technical scheme, when explosion-proof valve was located the laser welding ware below, the piston rod of horizontal pneumatic cylinder moved to the direction that is close to the link joint conveyer belt, and two piston rods of two-way centre gripping pneumatic cylinder move to the direction that is close to each other, hold lithium battery pack until two butt plate clamps to make the explosion-proof valve welding in-process of lithium cell difficult the removal, improved the welding accuracy.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the shell of the laser welding equipment is divided into a plurality of chambers, and the lithium battery part sequentially passes through the plurality of chambers and is gradually cooled, so that the temperature of the lithium battery part in a welding chamber is the lowest, and the cooling efficiency of the laser welder and the lithium battery part after laser welding is improved; the temperature is gradually increased in the dry gas, so that the probability that moisture in the air is precooled and liquefied and the production quality of the lithium battery is influenced due to the fact that the surface temperature of the lithium battery component is lower than the temperature of the air outside the shell is reduced;

2. the gas introduced into the welding chamber and the tempering chamber is dry gas, so that the probability of the influence of moisture on the production quality of the lithium battery is reduced;

3. the cooling and drying device reduces the moisture content and the temperature of the gas passing through the welding chamber through a cooling and dehumidifying principle, thereby reducing the influence of low cooling speed and high moisture content on the production quality of the lithium battery.

Drawings

Fig. 1 is a schematic overall structure diagram of an embodiment of the present application.

Fig. 2 is a partial sectional view of an embodiment of the present application to show the manner of installation of the link plate conveyor.

Fig. 3 is a partial cross-sectional view of an embodiment of the present application.

Fig. 4 is a partial sectional view of a seal rotor in an embodiment of the present application.

Fig. 5 is a partial sectional view of a cooling chamber in an embodiment of the present application.

Fig. 6 is a partial sectional view of a cooling pipe in the embodiment of the present application.

Description of reference numerals:

1. a pre-cooling chamber; 11. a first cold air inlet; 12. a return air outlet; 2. a welding chamber; 21. a second cold air inlet; 3. a transition chamber; 4. returning to the greenhouse; 41. a hot gas inlet; 5. a cooling and drying device; 51. a cooling tower; 52. a cooling chamber; 521. an air inlet; 522. an air outlet; 523. an air return port; 53. a cooling tube; 531. a cladding tube; 532. a liquid flow tube; 533. a coagulation chamber; 534. a flow guide pipe; 535. a drain valve; 54. an airflow duct; 541. cooling the branch pipe; 542. heating the branch pipe; 543. a heating box; 55. a liquid return pipe; 56. an air return pipe; 561. a one-way vent valve; 6. a chain plate conveyor belt; 61. a bearing plate; 7. a seal assembly; 72. a sealing block; 73. sealing the turntable; 731. a rotating shaft; 732. a fan blade; 7321. a sliding groove; 733. a telescopic sealing plate; 734. a drive spring; 74. a partition plate; 741. perforating; 742. a sealing plate; 75. a rotating shaft transmission belt; 76. a drive motor; 8. a fixing mechanism; 81. a transverse hydraulic cylinder; 82. a bidirectional clamping hydraulic cylinder; 83. a butt joint plate; 9. a housing; 91. a laser welder; 92. and a barrier block.

Detailed Description

The present application is described in further detail below with reference to figures 1-6. The arrow direction in the figure is the lithium battery component conveying direction.

The embodiment of the application discloses explosion-proof valve laser welding equipment of lithium cell. Referring to fig. 1 and 2, the laser welding apparatus includes a laser welding device including a housing 9 and a laser welder 91, the housing 9 being divided into a plurality of chambers, a seal assembly 7 including a partition plate 74 for dividing adjacent two chambers, a cool-drying device 5, and a flight conveyor 6. The plurality of chambers include a welding chamber 2, a laser welder 91 is installed in the welding chamber 2, and the cooling and drying device 5 includes a gas flow pipe 54, and the gas flow pipe 54 includes a cooling branch pipe 541 for introducing a cooling and drying gas into the welding chamber 2. The chain plate conveyor belt 6 conveys the lithium battery component into the shell 9, the welding of the explosion-proof valve is carried out in the welding chamber 2, the temperature of the welding chamber 2 is low, the temperature of the welded laser welding device 91 and the lithium battery component is favorably reduced, and the damage of welding to the non-welding part of the lithium battery component is reduced; the lower moisture content in the welding chamber 2 reduces the probability of reaction of lithium ions and water in the lithium battery, thereby improving the production quality of the lithium battery.

Referring to fig. 1 and 2, the interior of the housing 9 is divided into a pre-cooling chamber 1, a welding chamber 2, a transition chamber 3 and a temperature return chamber 4 in sequence along the conveying direction of the lithium battery component. The outer wall of the shell 9 is fixedly connected with a bearing plate 61 used for supporting the chain plate conveyor belt 6, the chain plate conveyor belt 6 penetrates through the shell 9, and a straight section and a through hole 741 for the lithium battery component to penetrate through are correspondingly formed in the shell 9 and the partition plate 74, wherein the straight section and the lithium battery component are far away from the ground of the chain plate conveyor belt 6. The straight section of the chain plate conveyor belt 6 close to the ground is not communicated with the chamber.

Referring to fig. 2 and 3, the sealing assembly 7 further comprises a plurality of sealing blocks 72 for sealing the gap between the side wall of the perforation 741 and the flight conveyor 6 and a sealing turntable 73 for blocking the convection of gas between adjacent chambers. The two ends of each chain plate of the chain plate conveyor belt 6 are fixedly connected with a sealing block 72, and one end, away from the chain plate of the chain plate conveyor belt 6, of the sealing block 72 is connected with the hole wall of the perforation 741 in a sealing and sliding mode. Two blocking blocks 92 are fixedly connected in the casing 9, one blocking block 92 is located at one end of the lithium battery component entering the casing 9, and the other blocking block 92 is located at one end of the lithium battery component leaving the casing 9. One side of the blocking block 92 is fixedly and hermetically connected with the bottom wall of the perforation 741, and the other end of the blocking block abuts against the chain plate conveyor belt 6 so as to block a gap between the chain plate conveyor belt 6 and the bottom wall of the perforation 741. The provision of the sealing block 72 and the blocking block 92 reduces the probability of the slat conveyor 6 taking outside air into the housing 9.

Referring to fig. 2 and 3, a sealing rotary disc 73 is disposed at each perforation 741, and a sealing plate 742 is fixedly connected to a top wall of the perforation 741, and the sealing plate 742 is an arc-shaped plate facing away from the perforation 741. The sealing turntable 73 comprises a rotating shaft 731, a driving member, five fan blades 732 and five telescopic sealing plates 733, wherein the rotating shaft 731 is axially perpendicular to the conveying direction of the chain plate conveyor 6, and the rotating shaft 731 is rotatably connected with the hole wall of the through hole 741. One end of the rotating shaft 731 of each sealing turntable 73 penetrates through the housing 9, a driving assembly for driving the rotating shaft 731 to rotate is fixedly connected to the housing 9, the driving assembly comprises a driving motor 76 and a rotating shaft driving belt 75, and an output shaft of the driving motor 76 is coaxially and fixedly connected with the rotating shaft 731 of the first sealing turntable 73 along the conveying direction of the chain plate conveying belt 6. The five shafts 731 are connected by shaft belts 75 to achieve synchronous rotation.

Referring to fig. 3 and 4, five fan blades 732 are uniformly arranged on the peripheral wall of the rotating shaft 731 and are fixedly connected to the rotating shaft 731. The five telescopic sealing plates 733 correspond to the five fan blades 732 one by one. A sliding groove 7321 is formed in one end of the fan sheet 732 away from the rotating shaft 731, the telescopic sealing plate 733 is connected to a groove wall of the sliding groove 7321 in a sliding manner along a direction approaching or departing from the rotating shaft 731, the driving member is a driving spring 734, one end of the driving spring 734 is connected to a groove bottom of the sliding groove 7321 in a sliding manner, and the other end of the driving spring 734 is fixedly connected to the telescopic sealing plate 733. The end of the retractable sealing plate 733 away from the bottom of the sliding groove 7321 is rounded, the retractable sealing plate 733 can abut against the link plate conveyor belt 6, and the retractable sealing plate 733 and the hole wall of the through hole 741 away from the ground can abut against each other.

Referring to fig. 2 and 3, when the driving motor 76 is started to drive the sealing turntable 73 to rotate, the retractable sealing plate 733 of the fan piece 732 adjacent to the link belt 6 abuts against the link belt 6, and moves in a direction approaching the bottom of the sliding groove 7321 by the abutting action of the link belt 6. The retractable sealing plate 733 of the fan piece 732 adjacent to the sealing plate 742 abuts against the top wall of the sealing plate 742, and moves into the sliding groove 7321. The sealing rotor 73 intermittently seals the perforations 741 thereby reducing the possibility of convective gas flow in the adjacent chambers. The lithium battery components are conveyed by the chain conveyor 6 towards the direction close to the housing 9, and the lithium battery components pass through the gap between two adjacent fan blades 732 and shuttle each chamber under the driving of the chain conveyor 6.

Referring to fig. 2 and 3, the fixed establishment 8 of the fixed lithium battery part of fixedly connected with centre gripping in the welding chamber 2, fixed establishment 8 includes horizontal pneumatic cylinder 81 and two-way centre gripping pneumatic cylinder 82, the cylinder body of horizontal pneumatic cylinder 81 and the lateral wall fixed connection of welding chamber 2, the piston rod of horizontal pneumatic cylinder 81 is to the direction removal that is close to or keeps away from the lithium battery part, the cylinder body of two-way centre gripping pneumatic cylinder 82 and the piston rod fixed connection of horizontal pneumatic cylinder 81, equal fixedly connected with butt joint board 83 on two piston rods of two-way centre gripping pneumatic cylinder 82, centre gripping lithium battery part under the piston rod drive of two-way centre gripping pneumatic cylinder 82 of two-way butt joint board 83, so that the difficult shift position of laser welding in-process lithium battery part, thereby the welded accuracy has been increased.

Referring to fig. 1 and 5, the cooling and drying device 5 further includes a cooling mechanism, a cooling chamber 52, and four cooling pipes 53, the cooling mechanism is a cooling tower 51, the cooling pipes 53 are located in the cooling chamber 52, the cooling tower 51 is communicated with the four cooling pipes 53 through connecting pipes, and the cooling pipes 53 are fixedly connected with the connecting pipes and are fixedly arranged in the cooling chamber through the connecting pipes.

Referring to fig. 5 and 6, the cooling pipe 53 includes a cladding pipe 531 and a liquid flow pipe 532, the cladding pipe 531 is sleeved outside the liquid flow pipe 532, an inner wall of the cladding pipe 531 is spaced from an outer wall of the liquid flow pipe 532, a top end of the cladding pipe 531 is bent and extended toward the liquid flow pipe 532 and is fixedly connected to the liquid flow pipe 532, and a bottom end of the cladding pipe 531 is bent and extended toward the liquid flow pipe 532 and is fixedly connected to the liquid flow pipe 532. The wall of the cladding pipe 531 is provided with a plurality of condensate cavities 533, and the walls of the condensate cavities 533 extend obliquely towards the bottom end of the liquid flow pipe 532. The bottoms of the four coating pipes 531 are communicated with the same flow guide pipe 534, and the flow guide pipe 534 passes through the side wall of the cooling chamber 52 and is connected with a drain valve 535. The lower end of each liquid flow pipe 532 is communicated with the same liquid return pipe 55, and one end of the liquid return pipe 55 far away from the liquid flow pipe 532 is communicated with the cooling tower 51, so that a closed loop is formed among the cooling tower 51, the connecting pipe, the cooling pipe 53 and the liquid return pipe 55, and the liquid flow pipes 532 always have the function of cooling and drying gas.

Referring to fig. 3 and 5, an air inlet 521 and an air return opening 523 are formed in one end of the cooling chamber 52, which is far away from the ground, the air inlet 521 is communicated with a blower, an air return pipe 56 is connected to the air return opening 523, an air return air outlet 12 is formed in the side wall of the pre-cooling chamber 1, one end of the air return pipe 56, which is far away from the cooling chamber 52, is hermetically and fixedly connected with the peripheral wall of the air return air outlet 12, so that the air return pipe 56 is communicated with the interior of the pre-cooling chamber 1, and a one-way vent valve 561 for allowing air to flow from the pre-cooling chamber 1 to the cooling chamber 52 is arranged in the air return pipe 56.

Referring to fig. 1, 3 and 5, an air outlet 522 is opened on a side wall of the cooling chamber 52 opposite to the air inlet 521, the air outlet 522 is located at one end of the cooling chamber 52 close to the ground, and the airflow pipe 54 is fixedly and hermetically connected with a peripheral wall of the air outlet 522. The air flow pipe 54 extends in a bent manner in the direction of the housing 9 and is divided into two cooling branch pipes 541 and one heating branch pipe 542. The side wall of the pre-cooling chamber 1 is provided with a first cold air inlet 11, the side wall of the welding chamber 2 is provided with a second cold air inlet 21, one cooling branch pipe 541 is hermetically and fixedly connected with the peripheral wall of the first cold air inlet 11, and the other cooling branch pipe 541 is hermetically and fixedly connected with the peripheral wall of the second cold air inlet 21. The temperature return chamber 4 is provided with a hot gas inlet 41, the heating branch pipes 542 are fixedly connected with a heating box 543 for heating the gas in the heating branch pipes 542, one end of the heating branch pipes 542 close to the cooling branch pipes 541 is fixedly connected with a one-way vent valve 561, and one end of the heating branch pipes 542 far away from the cooling chamber 52 is sealed and fixedly connected with the peripheral wall of the hot gas inlet 41.

The blower blows air into the cooling chamber 52, meanwhile, the gas in the pre-cooling chamber 1 enters the cooling chamber 52, moisture in the air enters the liquid condensation cavity 533 and is liquefied on the surface of the liquid flow pipe 532, the liquefied water moves towards the direction close to the bottom wall of the cladding pipe 531 along the outer wall of the liquid flow pipe 532, and the condensed liquefied water is guided out of the cooling chamber 52 through the guide pipe 534. The gas is lowered in temperature by the heat transfer and moves in the direction of the gas flow pipe 54 while the gas pressure in the cooling chamber 52 is constantly increased, and is introduced into the pre-cooling chamber 1 and the welding chamber 2 through the cooling branch pipe 541. The gas introduced into the heating branch 542 forms hot and dry gas by the heating action of the heating tank 543, and enters the temperature return chamber 4.

The implementation principle of the laser welding equipment for the lithium battery explosion-proof valve is as follows:

the driving motor 76, the blower and the cooling tower 51 are started, the liquid coolant in the cooling tower 51 is introduced into the cooling pipe 53 through the connecting pipe, the blower conveys air to the cooling chamber 52, the air is dried and cooled in the cooling chamber 52, the cooled and dried gas is introduced into the precooling chamber 1 and the welding chamber 2 through the cooling branch pipe 541, the air pressure in the precooling chamber 1 is gradually increased, and the circulated gas is introduced into the precooling chamber 1 again through the air return pipe 56. The heated dry gas is passed back to the greenhouse 4 via heating manifold 542.

The lithium battery component is placed on the chain plate conveyor belt 6, the explosion-proof valve is placed on the lithium battery component, the lithium battery component enters the pre-cooling chamber 1 from the gap between the two fan blades 732 for pre-cooling, then enters the welding chamber 2, when the explosion-proof valve is located below the laser welder 91, the lithium battery component is fixed by the fixing mechanism 8, and the laser welder 91 performs laser welding on the explosion-proof valve. After the welding, lithium battery component is loosened to fixing mechanism 8, and lithium battery component gets into transition room 3 and temperature return room 4 along with link joint conveyer belt 6 in proper order, and lithium battery component surface temperature risees gradually, and because of not dry gas in the cavity, the difficult liquefied water that forms on lithium battery surface. The lithium battery component leaves the shell 9 along with the chain plate conveyor belt 6, and because the surface temperature of the lithium battery component is less different from the external environment, liquefied water is not easily formed on the surface, so that the probability of the reduction of the production quality of the lithium battery caused by the reaction of lithium ions and water in the lithium battery component is reduced.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides an explosion-proof valve laser welding equipment of lithium cell which characterized in that: the device comprises a laser welding device, a chain plate conveyor belt (6) used for conveying lithium battery components and a cooling and drying device (5) used for conveying cooling and drying gas for the laser welding device, wherein the laser welding device comprises a shell (9) and a laser welder (91), the shell (9) is internally divided into a plurality of chambers, the chambers comprise a welding chamber (2) and a temperature return chamber (4), the laser welder (91) is installed in the welding chamber (2), the chain plate conveyor belt (6) penetrates through the shell (9), a straight section, far away from the ground, of the chain plate conveyor belt (6) sequentially penetrates through the welding chamber (2) and the temperature return chamber (4), the cooling and drying device (5) comprises an airflow pipe (54), the airflow pipe (54) comprises a cooling branch pipe (541) and a heating branch pipe (542), the cooling branch pipe (541) is communicated with the welding chamber (2), and the heating branch pipe (542) is communicated with the temperature return chamber (4);

the laser welding equipment further comprises a sealing assembly (7) for blocking gas convection, the sealing assembly (7) comprises a sealing block (72) and partition plates (74) for partitioning each chamber, the partition plates (74) are fixedly connected with the shell (9), through holes (741) for allowing lithium battery components and straight sections of the chain plate conveyor belt (6) far away from the ground to pass through are correspondingly formed in the partition plates (74) and the shell (9), the sealing block (72) is fixedly connected with the chain plate conveyor belt (6), and the sealing block (72) is connected with the hole walls of the through holes (741) in a sealing and sliding mode;

the sealing assembly (7) further comprises a plurality of sealing turntables (73), each sealing turntable (73) comprises a rotating shaft (731), a plurality of fan sheets (732) and telescopic sealing plates (733) which correspond to the fan sheets one by one, the rotating shaft (731) is connected with the hole wall of the through hole (741) in a rotating mode, the axial direction of the rotating shaft (731) is perpendicular to the conveying direction of the chain plate conveyor belt (6), a driving assembly used for driving the rotating shaft (731) to rotate is arranged on the shell (9), the fan sheets (732) are uniformly distributed in the circumferential direction of the rotating shaft (731), the fan sheets (732) are fixedly connected with the rotating shaft (731), the telescopic sealing plates (733) are connected with the fan sheets (731) in a sliding mode in the direction close to or far away from the rotating shaft (731), driving pieces used for driving the telescopic sealing plates (733) to slide are arranged on the fan sheets (732), the top walls of the through holes (741) are fixedly connected with the sealing plates (742), the telescopic sealing plates (733) can abut against the telescopic sealing plates (733) and the sealing plates (733) can abut against the sealing plates (742), and the telescopic sealing plates (733) can abut against the chain plate conveyor belt (732).

2. The laser welding device for the explosion-proof valve of the lithium battery as claimed in claim 1, wherein: the lithium battery pack is characterized in that two blocking blocks (92) are arranged in the shell (9), one blocking block (92) is located at one end, entering the shell (9), of the lithium battery component, the other blocking block (92) is located at one end, leaving the shell (9), of the lithium battery component, the blocking blocks (92) are fixedly connected with the bottom wall of the perforation hole (741), and the blocking blocks (92) are abutted to the chain plate conveyor belt (6).

3. The laser welding apparatus for the explosion-proof valve of the lithium battery as claimed in claim 1, wherein: the cooling and drying device (5) further comprises a cooling mechanism, a cooling chamber (52) and a cooling pipe (53), wherein an air inlet (521) and an air outlet (522) are formed in the cooling chamber (52), the airflow pipe (54) is communicated with the air outlet (522), a blower is communicated with the air inlet (521), the cooling pipe (53) is fixedly arranged in the cooling chamber (52), and the cooling pipe (53) is communicated with the cooling mechanism.

4. The laser welding device for the explosion-proof valve of the lithium battery as claimed in claim 3, wherein: cooling tube (53) are including cladding pipe (531) and liquid flow pipe (532), liquid flow pipe (532) and cooling body intercommunication, cladding pipe (531) cover is established in the outside of liquid flow pipe (532) to with liquid flow pipe (532) fixed connection, set up on cladding pipe (531) and supply the moisture to reach lime set chamber (533) of liquid flow pipe (532) outer wall, the axis of lime set chamber (533) sets up with the axial contained angle of liquid flow pipe (532), and the accent of lime set chamber (533) is towards air inlet (521).

5. The laser welding device for the explosion-proof valve of the lithium battery as claimed in claim 4, wherein: cladding pipe (531) and liquid flow pipe (532) interval set up, be connected with honeycomb duct (534) that are used for deriving the liquefied water on cooling tube (53), honeycomb duct (534) wear to establish the lateral wall of cooling chamber (52).

6. The laser welding apparatus for the explosion-proof valve of the lithium battery as claimed in claim 4, wherein: the cooling pipe (53) is connected with a liquid return pipe (55) used for recovering liquid in the liquid flow pipe (532), the liquid return pipe (55) is communicated with the liquid flow pipe (532), and the liquid return pipe (55) penetrates through the side wall of the cooling chamber (52) and is communicated with the cooling mechanism.

7. The laser welding device for the explosion-proof valve of the lithium battery as claimed in claim 1, wherein: the multiple chambers further comprise a pre-cooling chamber (1), the pre-cooling chamber (1) is located behind the welding chamber (2) along the conveying direction of the chain plate conveyor belt (6), the cooling branch pipe (541) is communicated with the pre-cooling chamber (1), a gas return pipe (56) is connected into the pre-cooling chamber (1), the gas return pipe (56) penetrates through the side wall of the pre-cooling chamber (1) and is communicated with the cooling chamber (52), and a one-way vent valve (561) for allowing gas to flow from the pre-cooling chamber (1) to the cooling chamber (52) is arranged in the gas return pipe (56).

8. The laser welding device for the explosion-proof valve of the lithium battery as claimed in claim 1, wherein: the chambers further comprise a transition chamber (3), and the transition chamber (3) is positioned in front of the welding chamber (2) and behind the temperature returning chamber (4) along the conveying direction of the chain plate conveyor belt (6).

9. The laser welding apparatus for the explosion-proof valve of the lithium battery as claimed in claim 1, wherein: be provided with fixed establishment (8) that are used for fixed lithium cell part in welding chamber (2), fixed establishment (8) are including horizontal pneumatic cylinder (81) and two-way centre gripping pneumatic cylinder (82), the cylinder body of horizontal pneumatic cylinder (81) and the lateral wall fixed connection of welding chamber (2), the piston rod of horizontal pneumatic cylinder (81) is to being close to or keeping away from the direction removal of link joint conveyer belt (6), the cylinder body of two-way centre gripping pneumatic cylinder (82) and the piston rod fixed connection of horizontal pneumatic cylinder (81), equal fixedly connected with butt joint board (83) on two piston rods of two-way centre gripping pneumatic cylinder (82), two butt joint board (83) all can be contradicted with lithium cell part.