CN219786885U - Back contact battery welding equipment - Google Patents

Abstract

The utility model is applicable to the technical field of solar cell welding, and provides back contact cell welding equipment which comprises a high-temperature platform and a low-temperature platform arranged above the high-temperature platform, wherein a plurality of supporting parts are arranged at intervals on the high Wen Pingtai, a plurality of avoiding parts are arranged on the low-temperature platform, each supporting part can pass through the corresponding avoiding part, and the high-temperature platform can be lifted relative to the low-temperature platform; the high-temperature platform is used for heating a plurality of back contact batteries placed on the high-temperature platform in a contact manner; the high temperature platform can be lowered relative to the low temperature platform, so that the heated plurality of back contact batteries are separated from the high temperature platform and placed on the low temperature platform for cooling. The back contact battery welding equipment provided by the utility model can reduce the warping degree of the back contact battery after welding, and greatly improves the reliability and yield of a battery assembly formed by welding the back contact battery.

Description

Back contact battery welding equipment

Technical Field

The utility model relates to the technical field of solar cell welding, in particular to back contact cell welding equipment.

Background

The back contact crystalline silicon solar cell, which is called IBC (Interdigitated back contact) cell for short, moves the metal contacts of the positive electrode and the negative electrode to the back of the IBC cell, and the front of the cell is electrodeless. PN junction and metal main grid of IBC battery are in the back of battery, and the positive influence that does not have the metal electrode to shelter from can make battery conversion efficiency higher, and pleasing to the eye moreover. The back contact battery welding device is used for interconnecting and connecting a plurality of back contact batteries into a solar battery string through a bus bar, and connecting the solar battery strings to form a solar battery assembly.

In the prior art, the welding equipment for the back contact battery generally adopts a non-contact infrared heating mode to realize the welding between the back contact battery and the welding strip, but the welding temperature is higher in the infrared welding mode, the welding temperature precision is poorer, the higher the welding temperature is, the higher the warping of the back contact battery after welding is, and the reliability and the process yield of the battery assembly are affected. Therefore, the prior art has the problem that the back contact battery and the welding strip are easily warped after being welded.

Disclosure of Invention

The utility model provides back contact battery welding equipment, and aims to solve the problem that the back contact battery welding equipment in the prior art adopts infrared heating to realize the welding of a back contact battery and a welding strip, and is easy to cause warping after the welding of the back contact battery.

The utility model is realized in such a way, and provides a back contact battery welding device, which comprises a high-temperature platform and a low-temperature platform arranged above the high-temperature platform, wherein a plurality of supporting parts for supporting the back contact battery are arranged on the high-temperature platform at intervals, a plurality of avoiding parts which are matched with the supporting parts in a one-to-one correspondence manner are arranged on the low-temperature platform, each supporting part can pass through the corresponding avoiding part, and the high-temperature platform can be lifted relative to the low-temperature platform;

the high-temperature platform is used for heating a plurality of back contact batteries placed on the high-temperature platform in a contact way so that a plurality of welding strips placed on main grids of the back contact batteries are connected with the back contact batteries; the high-temperature platform can descend relative to the low-temperature platform, so that the heated plurality of back contact batteries are separated from the high-temperature platform and placed on the low-temperature platform for cooling.

Preferably, the back contact battery welding apparatus includes:

and the lifting mechanism is used for driving the high-temperature platform to lift relative to the low-temperature platform and is connected with the high-temperature platform.

Preferably, the avoiding part is a through hole or a through groove penetrating through the low-temperature platform, and the supporting part is a protrusion which is arranged on the high-temperature platform in a protruding manner and is matched with the through hole or the through groove.

Preferably, the low-temperature platform is further used for bearing a plurality of back contact batteries and a plurality of welding strips placed on the main grids of the back contact batteries;

the high-temperature platform can be lifted relative to the low-temperature platform, so that the back contact batteries and the welding strips are separated from the low-temperature platform at the same time and placed on the high-temperature platform.

Preferably, the method further comprises:

the first manipulator is movably arranged above the low-temperature platform and is used for placing a plurality of back contact batteries on the low-temperature platform.

Preferably, the method further comprises:

the second manipulator is movably arranged above the low-temperature platform and is used for placing a plurality of welding strips on the main grids of the back contact batteries, and pressing a plurality of pressing tools on the welding strips so that the welding strips are pressed on the main grids of the back contact batteries.

Preferably, the presser is provided with a first presser pin which is not overlapped with the welding spot on the back of the back contact battery, and a first spring is arranged between the first presser pin and the presser.

Preferably, the first pressing needle is made of aluminum, and an insulating layer is arranged on the surface of the first pressing needle.

Preferably, the first manipulator further comprises:

and the second pressing pins are consistent with the number and the positions of welding spots on the back of the back contact battery and are used for pressing down the welding strip so that the welding strip and the back contact battery are tightly pressed on the high-temperature platform.

Preferably, the first manipulator is further provided with a second spring connected with the second pressing needle.

Preferably, the surface of the second pressing needle is provided with a heat insulation layer.

Preferably, the low-temperature platform is provided with a first heating element, and the temperature of the low-temperature platform is 25-175 ℃.

Preferably, the high-temperature platform is provided with a second heating element, and the temperature of the high-temperature platform is 175-220 ℃.

According to the back contact battery welding equipment provided by the utility model, the high temperature platform and the low temperature platform which is arranged above the high temperature platform and can be lifted relatively to the high temperature platform are arranged, the high Wen Pingtai is utilized to heat the plurality of back contact batteries to be welded in a contact manner, so that the plurality of welding strips placed on the main grids of the plurality of back contact batteries are heated and welded with the plurality of back contact batteries, then the high temperature platform and the low temperature platform are controlled to move relatively in a lifting manner, the plurality of back contact batteries heated by the high temperature platform are separated from the high temperature platform and are placed on the low temperature platform for cooling, and the welding of the welding strips and the back contact batteries is completed. Because the high-temperature platform welds the back contact battery directly through the thermal contact welding process, compare the mode of infrared heating, can reduce the welding temperature of back contact battery to reduce the warpage degree after back contact battery welds, and can accurate control back contact battery welding temperature, make welding temperature precision higher, improved the reliability and the yield that form the battery pack after back contact battery welds greatly.

Drawings

Fig. 1 is a schematic perspective view of a back contact battery welding apparatus according to an embodiment of the present utility model;

fig. 2 is a structural exploded view of a back contact battery welding apparatus according to an embodiment of the present utility model;

FIG. 3 is a schematic cross-sectional view of a back contact battery according to an embodiment of the present utility model when placed on a low temperature platform;

fig. 4 is a schematic cross-sectional view of a back contact battery according to an embodiment of the present utility model when placed on a high temperature platform;

fig. 5 is a schematic perspective view of a back contact battery according to an embodiment of the present utility model when the back contact battery is placed on a low temperature platform;

fig. 6 is a schematic diagram of a back contact battery according to an embodiment of the present utility model when the back contact battery is placed on a low temperature platform;

fig. 7 is a perspective view of a back contact battery provided in an embodiment of the present utility model after being placed on a low temperature platform and a presser;

FIG. 8 is a schematic diagram of a back contact battery according to an embodiment of the present utility model when placed on a low temperature platform and after placement of a presser;

FIG. 9 is a schematic diagram of a first manipulator according to an embodiment of the present utility model pressing down a solder strip;

FIG. 10 is a schematic diagram of a first manipulator separated from a solder strip according to an embodiment of the present utility model;

FIG. 11 is a schematic diagram of a back contact cell provided by an embodiment of the present utility model;

FIG. 12 is a schematic view of a first clamping assembly provided in an embodiment of the present utility model;

FIG. 13 is a schematic view of a first clamping assembly and a clamp according to an embodiment of the present utility model;

FIG. 14 is a schematic view of a first clamping assembly clamping a solder strip and a second clamping assembly clamping a clamp according to an embodiment of the present utility model;

FIG. 15 is a schematic view of a solder strip and clip according to an embodiment of the present utility model when placed on a back contact cell;

FIG. 16 is a diagram of a backside ribbon pattern of a battery string for back contact battery welding provided by an embodiment of the present utility model;

fig. 17 is a schematic diagram of a solder strip and back contact battery according to an embodiment of the present utility model.

Detailed Description

The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

According to the back contact battery welding equipment provided by the embodiment of the utility model, the high temperature platform and the low temperature platform arranged above the high temperature platform are arranged, the high Wen Pingtai is utilized to heat the plurality of back contact batteries to be welded in a contact manner, so that the plurality of welding strips arranged on the main grids of the plurality of back contact batteries are heated and welded with the plurality of back contact batteries, the high temperature platform and the low temperature platform are controlled to relatively move up and down, the plurality of back contact batteries heated by the high temperature platform are separated from the high temperature platform and are placed on the low temperature platform for cooling, and the welding of the welding strips and the back contact batteries is completed. Because the high-temperature platform welds the back contact battery directly through the thermal contact welding process, compare the mode of infrared heating, can reduce the welding temperature of back contact battery to reduce the warpage degree after back contact battery welds, and can accurate control back contact battery welding temperature, make welding temperature precision higher, improved the reliability and the yield that form the battery pack after back contact battery welds greatly.

Referring to fig. 1-4, a back contact battery welding apparatus provided by the embodiment of the utility model includes a high temperature platform 1 and a low temperature platform 2 disposed above the high temperature platform 1, wherein the high temperature platform 1 is provided with a plurality of supporting portions 11 at intervals for supporting the back contact battery 100, the low temperature platform 2 is provided with a plurality of avoiding portions 21 in one-to-one correspondence with the plurality of supporting portions 11, each supporting portion 11 can pass through the corresponding avoiding portion 21, and the high temperature platform 1 can be lifted relative to the low temperature platform 2;

the high temperature platform 1 is used for heating the plurality of back contact batteries 100 placed on the high temperature platform 1 in a contact way so that a plurality of welding strips 200 placed on the main grids of the plurality of back contact batteries 100 are connected with the plurality of back contact batteries 100; the high temperature stage 1 may be lowered relative to the low temperature stage 2 so that the heated plurality of back contact cells 100 are separated from the high temperature stage 1 and placed on the low temperature stage 2 for cooling.

In the embodiment of the utility model, the back contact battery 100 welding device utilizes the high temperature platform 1 to heat the plurality of back contact batteries 100 to be welded which are placed on the high temperature platform 1 in a contact manner, so that the plurality of welding strips 200 which are placed on the main grids of the plurality of back contact batteries 100 are connected with the plurality of back contact batteries 100, then the high temperature platform 1 is controlled to move up and down relative to the low temperature platform 2, so that the plurality of back contact batteries 100 which are heated by the high temperature platform 1 are separated from the high temperature platform 1 and are placed on the low temperature platform 2 for cooling, and the welding of the welding strips 200 and the back contact batteries 100 is completed. Because the high-temperature platform 1 directly contacts and heats the back contact battery 100, compared with an infrared heating mode, the heating temperature of the back contact battery 100 can be reduced, the risk of warping after the back contact battery 100 is welded is greatly reduced, and the high-temperature platform 1 directly contacts and heats the back contact battery 100, so that the welding temperature of the back contact battery 100 can be accurately controlled, the welding temperature precision is higher, and the reliability and the yield of a battery assembly formed after the back contact battery 100 is welded are greatly improved.

In the embodiment of the utility model, at least one of the low-temperature platform 2 and the high-temperature platform 1 is arranged in a liftable manner, and the low-temperature platform 2 and the high-temperature platform 1 can both be lifted, or any one of the low-temperature platform 2 and the high-temperature platform 1 can be lifted. When the high temperature platform 1 descends relative to the low temperature platform 2, the heated plurality of back contact batteries 100 can be separated from the high temperature platform 1 and placed on the low temperature platform 2 for cooling, so that the tin-plated alloy or tin paste on the surface of the solder strip 200 is quickly solidified and forms stable welding with the main grid of the back contact batteries 100.

In the embodiment of the utility model, during the heating stage of the back contact battery 100, the back surfaces of the back contact batteries 100 are upwards placed on the high temperature platform 1, the solder strips 200 are placed on the main grids of the back contact batteries 100, and the high temperature platform 1 is utilized to contact and heat the placed back contact batteries 100, so that the solder strips 200 placed on the main grids of the back contact batteries 100 and the back contact batteries 100 are heated at the same time, and the tin-plated alloy or tin paste on the surfaces of the solder strips 200 is melted, so as to be connected with the main grids of the back contact batteries 100. After the back contact battery 100 is heated, the back contact battery 100 enters a cooling stage, the high temperature platform 1 descends relative to the low temperature platform 2, so that the heated plurality of back contact batteries 100 are separated from the high temperature platform 1 and are placed on the low temperature platform 2 for cooling, the welding strip 200 and the back contact battery 100 are cooled, and the welding spot positions of the main grid of the welding strip 200 and the back contact battery 100 form stable welding.

As an embodiment of the present utility model, the back surface of the back contact battery 100 is printed with an insulating paste or other insulating material and baked, respectively, in parallel to both sides of the main grid, to prevent the solder strip 200 from contacting the opposite electrode to form a short circuit. Wherein solder joints on the main grid of the back contact battery 100 are printed with solder paste or other conductive material for soldering with the solder strips 200. Preferably, the melting temperature of the solder joint on the main gate of the back contact battery 100 is 175-185 ℃.

As shown in fig. 10, as an embodiment of the present utility model, 10 main grids are provided on the back surface of each back contact cell 100, wherein 5 positive main grids 102,5 negative main grids 103 are provided, and an even number of welding spots are provided on each main grid.

As shown in fig. 17, in order to reduce the problem of warpage of the back contact battery 100 after soldering, the solder strip 200 is subjected to a bending process, and the solder strip 200 between the pads 101 of the back contact battery 100 is processed into an arch or other shape perpendicular to the back surface of the back contact battery 100, as an embodiment of the present utility model.

As a preferred embodiment of the present utility model, the back contact battery 100 welding apparatus includes:

and a lifting mechanism (not shown) for driving the high-temperature platform 1 to lift relative to the low-temperature platform 2, wherein the lifting mechanism is connected with the high-temperature platform 1.

In this embodiment, the low temperature platform 2 is fixed, and the high temperature platform 1 can be lifted relative to the low temperature platform 2, so that the heated back contact batteries 100 are separated from the high temperature platform 1 and are rapidly cooled by the support parts 11 placed on the low temperature platform 2. Moreover, only the lifting mechanism is used for controlling the high-temperature platform 1 to lift relative to the low-temperature platform 2, so that the structure can be simplified, the realization cost can be reduced, and the control of the high-temperature platform 1 and the low-temperature platform 2 is facilitated.

In the present embodiment, the specific structure of the lifting mechanism is not limited. For example, the lifting mechanism may include a motor, a gear connected with the motor, and a rack meshed with the gear for driving, where the rack is connected with the high temperature platform 1, and the high temperature platform 1 can be driven to lift relative to the low temperature platform 2 by controlling the motor to rotate forward and backward. The lifting mechanism can also be a telescopic motor or a hydraulic cylinder which is directly connected with the high-temperature platform 1, and the telescopic motor or the hydraulic cylinder can be used for directly driving the high-temperature platform 1 to lift relative to the low-temperature platform 2.

As an embodiment of the present utility model, the avoiding portion 21 is a through hole or a through slot penetrating the low temperature platform 2, and the supporting portion 11 is a protrusion that is provided on the high temperature platform 1 and mates with the through hole or the through slot.

In this embodiment, when the avoiding portion 21 is a through hole, the through hole may be a square through hole, a circular through hole, or a through hole of another shape. When the relief portion 21 is a through groove, the through hole may be a square groove, a circular groove, or a groove of another shape. The shape and number of the avoidance portions 21 are consistent with the shape and number of the support portions 11, and the number of the avoidance portions 21 and the support portions 11 may be set according to actual needs. The avoiding portion 21 shown in fig. 1 is a square hole, and the supporting portion 11 is a protrusion in a direction matching with the square hole.

In this embodiment, the supporting portion 11 may pass through the corresponding escape portion 21 for supporting the back contact battery 100. When the high temperature platform 1 completes heating the plurality of back contact batteries 100, the high temperature platform 1 moves downward relative to the low temperature platform 2, and at this time, the plurality of supporting parts 11 of the high temperature platform 1 move downward relative to the low temperature platform 2, so that the plurality of back contact batteries 100 are placed on the low temperature platform 2 for cooling.

As an embodiment of the present utility model, the low-temperature platform 2 is further used for carrying a plurality of back contact batteries 100 and a plurality of solder strips 200 placed on the main grids of the back contact batteries 100;

the high temperature stage 1 may be elevated relative to the low temperature stage 2 such that the plurality of back contact cells 100 and the plurality of solder strips 200 are simultaneously separated from the low temperature stage 2 and placed on the high temperature stage 1.

In this embodiment, before the welding heating stage, the back contact battery 100 may be placed on the low temperature platform 2 with the back sides of the back contact batteries 100 facing upwards, and the plurality of solder strips 200 are placed on the main grids of the plurality of back contact batteries 100, and the low temperature platform 2 is used to preheat the back contact batteries 100 at a certain temperature before welding heating, so as to avoid the back contact batteries 100 from directly heating from the high temperature platform 1 to the welding temperature, and achieve the heating transition effect, avoid the back contact batteries 100 from cracking due to rapid heating of the back contact batteries 100, and improve the welding yield of the back contact batteries 100. After the preheating of the back-contact battery 100 by the low-temperature platform 2 is completed, the high-temperature platform 1 is raised relative to the low-temperature platform 2, and the high-temperature platform 1 drives the plurality of back-contact batteries 100 and the plurality of solder strips 200 to move upwards until the plurality of back-contact batteries 100 are completely separated from the low-temperature platform 2, and at this time, the back-contact battery 100 and the plurality of solder strips 200 are simultaneously placed on the plurality of supporting parts 11 on the high-temperature platform 1 to perform subsequent heating welding of the back-contact battery 100.

Referring to fig. 9-10, as an embodiment of the present utility model, the apparatus further includes a first robot 3 movably disposed above the low-temperature platform 2 for placing a plurality of back-contact batteries 100 on the low-temperature platform 2.

In this embodiment, the first manipulator 3 can move along the X-axis, Y-axis and Z-axis directions above the low temperature platform 2, and the first manipulator 3 replaces a manual work to place a plurality of back contact batteries 100 on the low temperature platform 2, so as to realize automatic placement of the back contact batteries 100.

Referring to fig. 5-8, as an embodiment of the present utility model, the method further includes:

the second manipulator movably arranged above the low-temperature platform 2 is used for placing a plurality of welding strips 200 on the main grids of the back contact batteries 100 and pressing a plurality of pressing tools 5 on the welding strips 200 so that each welding strip 200 is pressed on the main grid of the back contact battery 100.

In this embodiment, the second manipulator can move along the X-axis, Y-axis and Z-axis directions above the low temperature platform 2, and replace the manual work with the second manipulator to place the plurality of solder strips 200 on the main grids of the plurality of back contact batteries 100, so as to realize automatic placement of the solder strips 200 and the pressing tool 5, and the pressing tool 5 is used to press the solder strips 200 down to prevent the solder strips 200 from shifting relative to the back contact batteries 100, so that each solder strip 200 is tightly attached to the main grid of the back contact battery 100, and the welding precision of the solder strips 200 and the back contact batteries 100 is ensured. The second manipulator and the first manipulator 3 may be integrally provided together or may be separately provided.

As an embodiment of the present utility model, the presser 5 can magnetically adsorb the low temperature platform 2 and the high temperature platform 1, so that the presser 5 can tightly press the solder strip 200 and the back contact battery 100 on the low temperature platform 2 or the high temperature platform 1, preventing the back contact battery 100 from shifting, and improving the welding precision. Specifically, magnets may be provided on the presser 5 or the low temperature stage 2 and the high temperature stage 1.

As an embodiment of the present utility model, the second robot includes:

a first clamping assembly for placing the plurality of solder strips 200 onto the main grids of the plurality of back contact cells 100;

and a second clamping assembly for pressing the plurality of pressing tools 5 onto the plurality of bonding tapes 200 so that each bonding tape 200 is pressed onto the main grid of the back contact battery 100.

In the embodiment of the present utility model, as shown in fig. 12, the first clamping assembly includes a head-tail positioning jaw 10 for grabbing the heads and tails of the plurality of solder strips 200, and an intermediate solder strip positioning jaw 20 for grabbing the intermediate positions of the plurality of solder strips 200. Wherein the intermediate strap positioning jaw 20 has a strap cutting function at the same time. The head end, the tail end and the middle part of the welding strip 200 are respectively clamped by the head-tail positioning clamping jaw 10 and the middle welding strip positioning clamping jaw 20, so that the welding strip 200 is prevented from being broken in the clamping or carrying process, the positioning precision of the welding strip 200 is improved, and the welding precision is improved.

In the embodiment of the present utility model, as shown in fig. 13, the second clamping assembly is configured to clamp the plurality of pressing tools 5, and press the plurality of pressing tools 5 onto the plurality of solder strips 200, so that each solder strip 200 is pressed onto the main grid of the back contact battery 100. In practical application, the welding strip 200 required by the battery string is pulled and cut by the welding strip stretching mechanism, and the second clamping component moves and clamps the welding strip 200 to pull and cut the welding strip 200 required by the battery string. The middle welding strip positioning clamping jaw 20 in the second clamping assembly cuts off the redundant welding strip 200, and places the whole series of welding strips 200 and the pressing tool 5 on the back of the back contact battery string 60, so that high-precision positioning between the welding strip 200 and the back contact battery 100 is completed.

As shown in fig. 16, after the soldering is completed, the solder strips 200 on the back side of the back contact battery string are distributed as shown in fig. 16. Each back contact battery piece shown in fig. 11 is subjected to laser scribing to obtain 2 half battery pieces, wherein the first half battery piece is placed on a first piece of a battery string, and the second half battery piece is placed on a second piece of the battery string after 180-degree rotation. Repeating the above process to complete the arrangement of a series of battery strings.

As an embodiment of the present utility model, the presser 5 is provided with a first presser pin 51 which is not overlapped with the position of the welding spot on the main grid of the back contact battery 100, and a first spring is provided between the first presser pin 51 and the presser 5.

In this embodiment, the pressing tool 5 presses the welding strip 200 with the first pressing pin 51, so that the welding strip 200 is tightly attached to the main grid of the corresponding back contact battery 100, and the welding between the welding strip 200 and the main grid of the back contact battery 100 is more stable. By providing the first spring between the first presser 51 and the presser 5, the first presser 51 can more closely press the solder strip 200 by the elastic force of the first spring, which is used by the first presser 51.

As an embodiment of the present utility model, the first presser 51 is made of aluminum, and the surface of the first presser 51 is provided with an insulating layer. The insulating layer can be alumina, ceramic or other insulating materials, and has an insulating effect, so that the safety and reliability of welding are improved.

As an embodiment of the present utility model, the first robot 3 further includes:

and the second pressing pins 31, which are consistent with the number and positions of the welding spots on the back surface of the back contact battery 100, are used for pressing the welding strip 200 so as to tightly press the welding strip 200 and the back contact battery 100 on the high-temperature platform 1.

In this embodiment, in the heating welding stage, the first manipulator 3 presses down the welding strip 200 through the second pressing pin 31, so that the welding strip 200 and the main grid of the back contact battery 100 are welded more firmly and reliably.

As an embodiment of the present utility model, the first robot arm 3 is further provided with a second spring (not shown) connected to the second presser finger 31.

In this embodiment, the second pressing pin 31 is connected to the first manipulator 3 through the second spring, so that the second pressing pin 31 and the first manipulator 3 are flexibly connected, rigid contact between the second pressing pin 31 and the welding strip 200 is avoided, and the welding process of the back contact battery 100 with different thicknesses can be self-adapted because the second pressing pin 31 can move up and down.

As an embodiment of the present utility model, the surface of the second presser finger 31 is provided with a heat insulating layer. The heat insulating layer plays a heat insulating effect to prevent heat on the presser 5 from being transferred to the first robot 3, so as to improve welding stability.

As an embodiment of the present utility model, a first heating member (not shown) is provided on the low temperature stage 2, and the temperature of the low temperature stage 2 is 25 to 175 ℃.

In this embodiment, the first heating element may specifically be an electric heating wire that is built in the low-temperature platform 2. The low-temperature platform 2 is heated by the first heating element, so that the low-temperature platform 2 is kept in the temperature range of 25-175 ℃, and preheating of the back contact battery 100 and cooling after heating and welding are conveniently realized. Wherein, the temperature of the low temperature platform 2 is any value of 25-175 ℃, and can be set according to actual needs. For example, the temperature of the low temperature stage 2 may be 25 ℃, 40 ℃, 50 ℃, 60 ℃, 70 ℃, 80 ℃, 90 ℃, 100 ℃, 120 ℃, 150 ℃, or 175 ℃ in particular.

As an embodiment of the present utility model, a second heating member (not shown) is provided on the high temperature stage 1, and the temperature of the high temperature stage 1 is 175-220 ℃.

In this embodiment, the second heating element may specifically be an electric heating wire that is built in the low-temperature platform 2. The second heating piece is used for heating the high-temperature platform 1, so that the high-temperature platform 1 is kept in a temperature range of 175-220 ℃, and the back contact battery 100 can be conveniently heated and welded. Wherein, the temperature of the high temperature platform 1 is any value from 175 ℃ to 220 ℃, and can be set according to actual needs. For example, the temperature of the high temperature stage 1 may be 175 ℃, 180 ℃, 190 ℃, 200 ℃, 210 ℃, or 220 ℃.

As an embodiment of the present utility model, a plurality of vacuum adsorption holes (not shown) are formed at the contact positions of the low temperature platform 2 and the high temperature platform 1 with the back contact battery 100, and teflon tapes or other high Wen Guanghua resistant materials are provided at the low temperature platform 2 and the high temperature platform 1 to prevent the front surface of the back contact battery 100 from being scratched.

Specifically, the plurality of supporting parts 11 of the high temperature platform 1 and the low temperature platform 2 are provided with vacuum adsorption holes, and when the back contact battery 100 is placed on the plurality of supporting parts 11 of the high temperature platform 1, the vacuum adsorption holes on the plurality of supporting parts 11 adsorb the back contact battery 100. When the back contact battery 100 is placed on the low temperature platform 2, the vacuum adsorption on the low temperature platform 2 adsorbs the back contact battery 100.

In the embodiment of the utility model, a high-temperature platform 1 and a low-temperature platform 2 form a group of welding platforms, and each group of welding platforms corresponds to a feeding station, a welding station and a discharging station. In order to improve welding efficiency, three groups of welding platforms are arranged, the three groups of welding platforms respectively correspond to a feeding station, a welding station and a discharging station, the three groups of welding platforms circularly move to different stations, welding beats are shortened to the maximum extent, and meanwhile welding of a series of battery strings is completed in one beat.

The back contact battery welding equipment of the embodiment of the utility model welds the back contact battery as follows:

when welding starts, after the back contact battery 100 passes through the correction position of the first manipulator 3, the back contact battery 100 is accurately placed on the low-temperature platform 2, and at the moment, the vacuum adsorption holes on the low-temperature platform 2 are opened, so that the back contact battery 100 is adsorbed on the surface of the low-temperature platform 2. The second manipulator simultaneously places the welding strip 200 and the pressing tool 5 on the back of the back contact battery 100, so that the welding strip 200 is overlapped with the main grid of the back contact battery 100, and the pressing tool 5 presses the welding strip 200 through the first pressing needle 51. When the back contact battery 100 is welded, the lifting mechanism drives the high-temperature platform 1 to lift, and the high-temperature platform 1 is in contact with the back contact battery 100 and adsorbs the back contact battery 100 on the surface of the back contact battery 100 through the vacuum adsorption holes on the high-temperature platform 1. The high temperature platform 1 continuously rises, the back contact battery 100 is separated from the low temperature platform 2, meanwhile, the second pressing needle 31 arranged on the first manipulator 3 descends, the welding strip 200 and the back contact battery 100 are tightly pressed on the surface of the high temperature platform 1, and under the action of high temperature, the welding strip 200 and the back contact battery 100 start to be welded. After a certain time, the lifting mechanism drives the high-temperature platform 1 to descend, the back contact battery 100 is separated from the high-temperature platform 1 and is contacted with the low-temperature platform 2, the first manipulator 3 ascends and is separated from the welding strip 200, and the temperature of the back contact battery 100 is reduced to finish welding.

Example two

The embodiment provides a back contact battery welding method, which is applied to the back contact battery welding device of the first embodiment, and includes the following steps:

step S10, heating at high temperature: a plurality of back contact batteries 100 and a plurality of welding strips 200 placed on the main grids of the back contact batteries 100 are simultaneously placed on a high-temperature platform 1, and the plurality of back contact batteries 100 are heated by contact of the high-temperature platform 1, so that the plurality of welding strips 200 are connected with the plurality of back contact batteries 100;

as an embodiment of the present utility model, in the high temperature heating step, further comprising:

the plurality of solder tapes 200 are pressed down by the first robot arm 3 so that the solder tapes 200 and the back contact battery 100 are tightly pressed against the high temperature stage 1.

In this embodiment, in the high-temperature heating welding stage, the first manipulator 3 presses down the plurality of welding strips 200 through the second pressing pin 31, so that the welding strips 200 are tightly attached to the main grids of the corresponding back contact battery 100, and the welding between the welding strips 200 and the main grids of the back contact battery 100 is more stable.

Step S20, low-temperature cooling: the high temperature platform 1 is lowered relative to the low temperature platform 2, so that the heated plurality of back contact batteries 100 are separated from the high temperature platform 1 and placed on the low temperature platform 2 for cooling.

In the embodiment of the utility model, the method for welding the back contact battery firstly utilizes the high temperature platform 1 to heat the plurality of back contact batteries 100 to be welded which are placed on the high temperature platform 1 in a contact way, so that the plurality of welding strips 200 which are placed on the main grids of the plurality of back contact batteries 100 are connected with the plurality of back contact batteries 100, then controls the high temperature platform 1 to descend relative to the low temperature platform 2, so that the plurality of back contact batteries 100 which are heated by the high temperature platform 1 are separated from the high temperature platform 1 and are placed on the low temperature platform 2 for cooling, and the welding of the welding strips 200 and the back contact batteries 100 is completed. Because the high-temperature platform 1 directly contacts and heats the back contact battery 100, compared with an infrared heating mode, the heating temperature of the back contact battery 100 can be reduced, the risk of warping after the back contact battery 100 is welded is greatly reduced, and the high-temperature platform 1 directly contacts and heats the back contact battery 100, so that the welding temperature of the back contact battery 100 can be accurately controlled, the welding temperature precision is higher, and the reliability and the yield of a battery assembly formed after the back contact battery 100 is welded are greatly improved.

Example III

On the basis of the second embodiment, the high-temperature heating step further includes:

step S5, preheating: the plurality of back contact cells 100 are placed on the low temperature stage 2 by the first robot arm 3, the plurality of bonding tapes 200 are placed on the respective main grids of the plurality of back contact cells 100 by the second robot arm, and the plurality of pressing tools 5 are pressed on the plurality of bonding tapes 200, and the plurality of back contact cells 100 are preheated by the low temperature stage 2.

In this embodiment, before the high-temperature heating and welding stage, the back contact battery 100 uses the first manipulator 3 to place the plurality of back contact batteries 100 on the low-temperature platform 2, uses the second manipulator to place the plurality of welding strips 200 on each main grid of the plurality of back contact batteries 100, presses the plurality of pressing tools 5 on the plurality of welding strips 200, uses the low-temperature platform 2 to contact and heat the back contact batteries 100 at a certain temperature before welding and heating, achieves the purpose of preheating, avoids the back contact batteries 100 from being directly heated to the welding temperature from normal temperature through the high-temperature platform 1, plays a role of heating and transition, avoids the back contact batteries 100 from being broken due to rapid heating of the back contact batteries 100, and improves the welding yield of the back contact batteries 100.

As an embodiment of the present utility model, the simultaneous placement of the plurality of back contact batteries 100 and the plurality of solder strips 200 placed on the respective main grids of the plurality of back contact batteries 100 on the high temperature stage 1 specifically includes:

the high temperature stage 1 is elevated relative to the low temperature stage 2 such that the preheated plurality of back contact cells 100 on the low temperature stage 2 are placed on the high temperature stage 1 along with the plurality of solder strips 200.

In this embodiment, after the preheating of the back-contact battery 100 by the low-temperature platform 2 is completed, the high-temperature platform 1 is raised relative to the low-temperature platform 2, and the high-temperature platform 1 drives the plurality of back-contact batteries 100 and the plurality of solder strips 200 to move upwards until the plurality of back-contact batteries 100 are completely separated from the low-temperature platform 2, and at this time, the back-contact battery 100 and the plurality of solder strips 200 are simultaneously placed on the high-temperature platform 1 for subsequent heat welding of the back-contact battery 100.

As an embodiment of the present utility model, the low temperature stage 2 is heated at 25 to 175 ℃.

In this embodiment, the temperature of the low temperature platform 2 is any value from 25 ℃ to 175 ℃, and can be set according to actual needs. For example, the temperature of the low temperature stage 2 may be 25 ℃, 40 ℃, 50 ℃, 60 ℃, 70 ℃, 80 ℃, 90 ℃, 100 ℃, 120 ℃, 150 ℃, or 175 ℃ in particular.

As an embodiment of the utility model, the heating temperature of the high-temperature platform 1 is 175-220 ℃, so that the warping of the back contact battery 100 caused by the overhigh temperature is avoided, the welding strip 200 and the welding spot can be sufficiently melted, and the welding effect is ensured. Wherein, the temperature of the high temperature platform 1 is any value from 175 ℃ to 220 ℃, and can be set according to actual needs. For example, the temperature of the high temperature stage 1 may be 175 ℃, 180 ℃, 190 ℃, 200 ℃, 210 ℃, or 220 ℃.

As a practical application of the present utility model, the back contact battery welding method specifically includes the following steps:

the first manipulator 3 places the back contact batteries 100 with the number of the battery strings on the low-temperature platform 2, at the moment, vacuum adsorption holes on the low-temperature platform 2 are opened, the back contact batteries 100 are adsorbed on the low-temperature platform 2, and at the moment, the low-temperature platform 2 is in contact with the back contact batteries 100;

the second manipulator pulls out the welding strips 200 required by a string of battery strings, and punches out the redundant welding strips 200 to finish the preparation of the welding strips 200 required by the whole string of battery strings;

after the second manipulator grabs a certain number of pressing tools 5, a string of welding strips 200 required by the battery string is grabbed;

the second manipulator places the welding strip 200 and the welding strip 200 pressing tool 5 required by the battery string on the back contact battery 100;

the high-temperature platform 1 ascends and contacts the back contact battery 100, the low-temperature platform 2 is separated from the back contact battery 100, and the high-temperature platform 1 melts solder paste on the main grid of the back contact battery 100;

after the high-temperature platform 1 heats the back contact battery 100, the high-temperature platform 1 descends and separates from the back contact battery 100, the back contact battery 100 is placed on the low-temperature platform 2 again, the low-temperature platform 2 is contacted with the back contact battery 100, so that solder paste on the main grid of the back contact battery 100 is cooled to be solid, and the welding of the back contact battery 100 and the welding strip 200 is completed;

and the second manipulator takes away the pressing tool 5 on the battery string, at the moment, the vacuum adsorption holes on the high-temperature platform 1 and the low-temperature platform 2 are closed, and the battery string suction string manipulator takes away the battery string on the platform and conveys the battery string to the battery string typesetter.

In the embodiment of the utility model, the whole string of manufacturing welding strips, the whole string of cutting welding strips, the whole string of clamping welding strips and the whole string of placing welding strips are adopted, and the welding strips are always in the fixed state of the mechanical arm in the whole manufacturing, cutting and placing processes of the welding strips, so that the high-precision alignment between the welding strips and the back contact battery is ensured.

Example IV

The embodiment also provides a battery string welded by the back contact battery welding method of the second embodiment or the third embodiment.

In the embodiment of the utility model, the battery string comprises a plurality of back contact batteries 100, and the plurality of back contact batteries 100 are serially connected together in sequence by a plurality of welding strips 200 so as to form the battery string. The specific number of back contact cells 100 and solder strips 200 is not limited.

In the embodiment of the utility model, the battery strings are welded by adopting the back contact battery 100 welding method in the second embodiment, so that compared with the battery strings welded by infrared heat welding, the risk of warping after the back contact battery 100 is welded can be greatly reduced, and the welding temperature precision is higher because the welding temperature of the back contact battery 100 can be accurately controlled, and the reliability and the yield of the battery strings formed after the back contact battery 100 is welded are greatly improved.

Example five

The present embodiment also provides a battery pack including the battery string of the fourth embodiment. The battery pack adopts the battery string of the fourth embodiment, so that the reliability and the yield of the battery pack can be improved.

In an embodiment of the utility model, the battery assembly may further comprise a metal frame, a back plate, photovoltaic glass and an adhesive film, the battery string is arranged in the metal frame, and the battery string is positioned between the back plate and the photovoltaic glass. The adhesive film is filled between the front surface of the battery string and the photovoltaic glass and between the back surface of the battery string and the back plate.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.

Claims (13)

1. The back contact battery welding equipment is characterized by comprising a high-temperature platform and a low-temperature platform arranged above the high-temperature platform, wherein a plurality of supporting parts for supporting the back contact battery are arranged on the high-temperature platform at intervals, a plurality of avoiding parts which are matched with the supporting parts in a one-to-one correspondence manner are arranged on the low-temperature platform, each supporting part can penetrate through the corresponding avoiding part, and the high-temperature platform can ascend and descend relative to the low-temperature platform;

the high-temperature platform is used for heating a plurality of back contact batteries placed on the high-temperature platform in a contact way so that a plurality of welding strips placed on main grids of the back contact batteries are connected with the back contact batteries; the high-temperature platform can descend relative to the low-temperature platform, so that the heated plurality of back contact batteries are separated from the high-temperature platform and placed on the low-temperature platform for cooling.

2. The back contact battery welding apparatus according to claim 1, wherein the back contact battery welding apparatus comprises:

and the lifting mechanism is used for driving the high-temperature platform to lift relative to the low-temperature platform and is connected with the high-temperature platform.

3. The back contact battery welding apparatus according to claim 1, wherein the avoiding portion is a through hole or a through groove penetrating the low temperature platform, and the supporting portion is a protrusion protruding from the high temperature platform and cooperating with the through hole or the through groove.

4. The back contact battery soldering apparatus of claim 1, wherein said low temperature platform is further configured to carry a plurality of said back contact batteries and a plurality of solder strips disposed on each of said main grids of a plurality of said back contact batteries;

the high-temperature platform can be lifted relative to the low-temperature platform, so that the back contact batteries and the welding strips are separated from the low-temperature platform at the same time and placed on the high-temperature platform.

5. The back contact battery welding apparatus of claim 1, further comprising:

the first manipulator is movably arranged above the low-temperature platform and is used for placing a plurality of back contact batteries on the low-temperature platform.

6. The back contact battery welding apparatus of claim 5, further comprising:

the second manipulator is movably arranged above the low-temperature platform and is used for placing a plurality of welding strips on the main grids of the back contact batteries and pressing a plurality of pressing tools on the welding strips so that the welding strips are pressed on the main grids of the back contact batteries.

7. The back contact battery welding apparatus according to claim 6, wherein the presser is provided with a first presser pin which is not overlapped with a welding spot position of a back surface of the back contact battery, and a first spring is provided between the first presser pin and the presser.

8. The back contact battery welding apparatus of claim 7, wherein the first pin is of aluminum material and the first pin surface is provided with an insulating layer.

9. The back contact battery welding apparatus of claim 5, wherein said first robot further comprises:

and the second pressing pins are consistent with the number and the positions of welding spots on the back of the back contact battery and are used for pressing down the welding strip so that the welding strip and the back contact battery are tightly pressed on the high-temperature platform.

10. The back contact battery welding apparatus of claim 9, wherein said first manipulator further comprises a second spring coupled to said second pin.

11. The back contact battery welding apparatus according to claim 9, wherein a surface of the second presser pin is provided with a heat insulating layer.

12. The back contact battery welding apparatus according to claim 1, wherein the low temperature stage is provided with a first heating member, and the temperature of the low temperature stage is 25 to 175 ℃.

13. The back contact battery welding apparatus according to claim 1, wherein the second heating member is provided on the high temperature stage, and the temperature of the high temperature stage is 175-220 ℃.