Laser welding mechanism for battery string

Abstract

The utility model discloses a laser welding mechanism for a battery string, the laser welding mechanism comprises a laser generating part, a laser shaping part and a first cooling assembly, the laser generating part comprises a laser generator, and the laser generator is configured to emit a laser beam to be shaped; the laser shaping part comprises a shell and an optical shaping device, the optical shaping device is installed in the shell, the optical shaping device receives a to-be-shaped laser beam emitted by the laser generator and shapes the received laser beam into linear laser, and the linear laser performs laser welding on to-be-welded points on the same straight line on the battery string; the first cooling assembly is configured to cool the optical shaping device. According to the laser welding mechanism, the optical shaping device is cooled through the first cooling assembly so that the temperature of the optical shaping device can be reduced, the optical shaping device can be matched with a laser generator with higher power, then the heating temperature of linear laser is increased, rapid heating welding of each row of welding points is achieved, and the laser welding efficiency is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of photovoltaic cell production equipment, and particularly relates to a laser welding mechanism for a cell string. BACKGROUND

[0002] The cell string comprises a plurality of cell pieces arranged in sequence, and the adjacent cell pieces are electrically connected through a welding strip. In order to ensure the stable connection of the welding strip and the cell piece, the welding strip is welded and fixed together with the grid line on the surface of the cell piece.

[0003] At present, the welding strip and the grid line of the cell piece can be heated by laser to make them hot melt together and then solidify to realize the welding and fixation of the welding strip and the cell piece. In order to improve the production efficiency, the laser beam generated by the laser generator is generally shaped into linear laser by optical shaping devices, and the linear laser is used to heat the welding points on the same straight line at the same time. However, the existing optical shaping devices usually adopt the combination of Powell prism or diffractive optical element, field lens or galvanometer, and these optical shaping devices cannot withstand high temperature. Therefore, the power of the laser generator cannot be too high, which causes that the temperature of the shaped linear laser cannot meet the requirement of rapid welding of the welding points, resulting in that the linear laser stays on each row of welding points for a long time and the welding efficiency is low. CONTENT OF THE INVENTION

[0004] The application aims to provide a laser welding mechanism for a cell string to solve the problem of low welding efficiency of the existing laser welding mechanism.

[0005] To achieve the above purpose, the application adopts the following technical solutions:

[0006] The application provides a laser welding mechanism for a cell string, which comprises a laser generating part, a laser shaping part and a first cooling assembly, wherein:

[0007] The laser generating part comprises a laser generator, and the laser generator is configured to emit a laser beam to be shaped;

[0008] The laser shaping part comprises a shell and an optical shaping device, the optical shaping device is installed in the shell, and the optical shaping device is configured to receive the laser beam to be shaped emitted by the laser generator and shape the received laser beam into linear laser, and the linear laser is used to implement laser welding on a plurality of welding points on the cell string which are on the same straight line;

[0009] The first cooling assembly is configured to cool the optical shaping device.

[0010] The laser welding mechanism for the battery string disclosed in the application realizes shaping of the laser beam into linear laser through cooperation of the laser generating part and the laser shaping part, can heat and weld the to-be-welded points in the same straight line, and can cool the optical shaping device through the first cooling assembly when the laser welding mechanism works, so as to reduce the temperature of the optical shaping device, make the optical shaping device adapt to a larger power laser generator, and further improve the heating temperature of the linear laser, realize rapid heating and welding of each row of welding points by the linear laser, and improve the laser welding efficiency.

[0011] Optionally, the first cooling assembly comprises a first cooling channel, a first liquid inlet pipe, a first liquid outlet pipe and a first liquid supply component, wherein:

[0012] The first cooling channel is arranged on the optical shaping device, the first liquid inlet pipe is in communication with the first end of the first cooling channel, and the first liquid outlet pipe is in communication with the second end of the first cooling channel.

[0013] The first liquid supply component is configured to supply the cooling medium into the first cooling channel through the first liquid inlet pipe, and the cooling medium flows out from the first liquid outlet pipe after passing through the first cooling channel, so as to cool the optical shaping device.

[0014] The first cooling channel is arranged on the optical shaping device, and the first liquid supply component supplies the cooling medium into the first cooling channel, so that the cooling medium takes away the heat of the optical shaping device when flowing through the first cooling channel, and then cools the optical shaping device, so that the optical shaping device is in a suitable working temperature for a long time. Meanwhile, the first cooling assembly cools the optical shaping device by the liquid cooling method, has the advantages of good cooling efficiency, good cooling effect and stable and reliable operation.

[0015] Optionally, the laser generating part further comprises a collimator, wherein:

[0016] The collimator is arranged at the emitting end of the laser generator, and the collimator is configured to receive the to-be-shaped laser beam emitted by the laser generator and propagate the received laser beam to the optical shaping device after collimation.

[0017] The collimator is arranged at the emitting end of the laser generator, and the collimator is configured to receive the to-be-shaped laser beam emitted by the laser generator and propagate the received laser beam to the optical shaping device after collimation.

[0018] Optionally, the laser generating part further comprises a second cooling assembly, and the second cooling assembly is configured to cool the collimator.

[0019] The second cooling assembly comprises a second cooling channel, a second liquid inlet pipe, a second liquid outlet pipe and a second liquid supply component, the second cooling channel is arranged in the collimator, the second liquid inlet pipe is in communication with a first end of the second cooling channel, and the second liquid outlet pipe is in communication with a second end of the second cooling channel.

[0020] The second liquid supply component is configured to supply the cooling medium into the second cooling channel through the second liquid inlet pipe, and the cooling medium flows out of the second liquid outlet pipe after passing through the second cooling channel, so as to implement liquid cooling on the working components of the collimator.

[0021] By arranging the second cooling channel in the collimator and supplying the cooling medium into the second cooling channel through the second liquid supply component, the cooling medium can take away the heat of the working components in the collimator when flowing through the second cooling channel, so as to cool the collimator and keep the collimator at a proper temperature for a long time. Meanwhile, the second cooling assembly adopts the liquid cooling mode to cool the collimator, and has the advantages of good cooling efficiency, good cooling effect and stable and reliable operation.

[0022] Optionally, the laser welding mechanism for the battery string further comprises a reflection assembly arranged on the propagation path of the laser beam, and the reflection assembly is configured to receive the collimator-collimated laser beam propagating along a first direction and deflect the received laser beam to propagate along a second direction towards the optical shaping device, the first direction being perpendicular to the second direction.

[0023] By arranging the reflection assembly on the propagation path of the laser beam, the reflection assembly deflects the collimator-collimated laser beam entering along the first direction to propagate along the second direction towards the optical shaping device, so as to control the propagation direction of the laser beam and have good flexibility. Meanwhile, this is also conducive to the reasonable layout of the various functional components of the laser welding mechanism.

[0024] Optionally, the reflection assembly comprises a base and a mirror, wherein:

[0025] The collimator is mounted on the base along the first direction, and the housing is mounted on the base along the second direction.

[0026] The base has a sealed cavity for mounting the mirror, and the mirror is mounted in the cavity, and the collimator-collimated laser beam propagates along the first direction to the mirror and then propagates along the second direction towards the optical shaping device after being reflected by the mirror.

[0027] By arranging the mirror, the collimator-collimated laser beam propagating along the first direction is reflected to propagate along the second direction towards the optical shaping device, so as to provide a reflection assembly with simple structure and easy implementation. By mounting the mirror in the sealed cavity in the base, the laser energy loss caused by external dust and impurities is prevented.

[0028] Optionally, the first end of the shell is detachably fixedly installed on the base through the connecting flange, and the second end of the shell is detachably provided with an end plate, and the optical shaping device is detachably installed on the end plate, and the end plate and the shell enclose a closed space for accommodating the optical shaping device.

[0029] The first end of the shell is installed on the base through the connecting flange, which ensures the stability and airtightness of the connection between the shell and the base, and facilitates the disassembly of the shell; the second end of the shell is provided with an end plate, and the optical shaping device is detachably installed on the end plate to form a closed space for accommodating the optical shaping device, which prevents external dust and impurities from causing laser energy loss and facilitates subsequent maintenance and repair.

[0030] Optionally, a light-transmitting hole is formed in the shell, and a protective lens for the linear laser to pass through is installed in the light-transmitting hole.

[0031] By installing the protective lens on the shell, the linear laser can pass through the protective lens to perform welding on the welding point, while ensuring the airtightness of the closed space.

[0032] Optionally, the optical shaping device is a copper integrating mirror, which includes a reflecting surface, receives the laser beam generated by the laser generator to be shaped through the reflecting surface, and emits the received laser beam after shaping into a linear laser.

[0033] By setting the optical shaping device as a copper integrating mirror, the integrating mirror divides the laser beam into a plurality of units, uniformly distributes the light of each unit, and then overlaps the light of all units on the working surface through integrating focusing, thereby obtaining a uniform light spot, so that the energy distribution of the linear laser is more uniform, and the welding quality is improved; at the same time, the use of the copper integrating mirror not only ensures the high-temperature resistance of the optical shaping device, but also makes the optical shaping device have good heat conductivity, which is conducive to improving the cooling effect of the first cooling assembly.

[0034] Optionally, the surface roughness Ra of the reflecting surface is less than 6nm.

[0035] By setting the surface roughness and surface roughness of the reflecting surface, the flatness of the reflecting surface is ensured, and the shaping effect of the integrating mirror is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 is a perspective structural schematic diagram of a laser welding mechanism for a battery string provided by the embodiment of the present application;

[0037] Figure 2 is a side view of a laser welding mechanism for a battery string provided by the embodiment of the present application;

[0038] Figure 3 is a cross-sectional view of a laser welding mechanism for a battery string provided by an embodiment of the present application;

[0039] Figure 4 is a perspective structural schematic view of another view of a laser welding mechanism for a battery string provided by an embodiment of the present application.

[0040] Figures 1 to 4 includes the following reference signs:

[0041] Laser generating part 10: laser generator 11, collimator 12, second cooling assembly 13, second liquid inlet pipe 130, second liquid outlet pipe 131;

[0042] Laser shaping part 20: shell 21, connecting flange 210, end plate 211, protective lens 212, optical shaping device 22, reflecting surface 220;

[0043] First cooling assembly 30: first liquid inlet pipe 31, first liquid outlet pipe 32;

[0044] Linear laser 40;

[0045] Reflecting assembly 50: base 51, cavity 510, reflecting mirror 52. DETAILED DESCRIPTION

[0046] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0047] The battery string includes a plurality of battery pieces arranged in sequence, and the adjacent battery pieces are electrically connected through the welding strip. In order to ensure the stable connection of the welding strip and the battery piece, the welding strip is welded and fixed together with the grid line on the surface of the battery piece.

[0048] At present, the welding strip and the grid line of the battery piece can be heated by laser to contact each other, so that they are hot-melted together and then cooled and solidified to realize the welding and fixation of the welding strip and the battery piece. In order to improve the production efficiency, the laser beam generated by the laser generator is generally shaped into linear laser by the optical shaping device, and the linear laser is used to heat the welding points in the same straight line at the same time. However, the existing optical shaping device usually adopts the combination of Powell prism or diffractive optical element, field lens or galvanometer mirror, and these optical shaping devices cannot withstand high temperature. Therefore, the power of the laser generator cannot be too high, which causes that the temperature of the shaped linear laser cannot meet the requirement of rapid welding of the welding points, resulting in that the linear laser stays on each row of welding points for a long time and the welding efficiency is low.

[0049] Therefore, the present application provides a laser welding mechanism for a battery string, which is described below with reference to Figure 1 and Figure 3As shown, the embodiment of the present application provides a laser welding mechanism for battery string, which comprises a laser generating part 10, a laser shaping part 20 and a first cooling assembly 30, wherein: the laser generating part 10 comprises a laser generator 11, which is configured to emit a laser beam to be shaped; the laser shaping part 20 comprises a shell 21 and an optical shaping device 22, which is installed in the shell 21 and is configured to receive the laser beam to be shaped emitted by the laser generator 11 and shape the received laser beam into a linear laser 40, which performs laser welding on a plurality of welding points on the battery string in the same straight line; and the first cooling assembly 30 is configured to cool the optical shaping device 22.

[0050] The laser welding mechanism for battery string provided by the present application can shape the laser beam into the linear laser 40 through the cooperation of the laser generating part 10 and the laser shaping part 20, so as to heat and weld the welding points in the same straight line. Meanwhile, the first cooling assembly 30 cools the optical shaping device 22 when the laser welding mechanism works, so as to reduce the temperature of the optical shaping device 22, so that the optical shaping device 22 can adapt to a larger power laser generator 11, thereby increasing the heating temperature of the linear laser 40 and realizing the rapid heating and welding of each row of welding points by the linear laser 40, and improving the laser welding efficiency.

[0051] Please refer to Figure 1 and Figure 2 As shown, in an embodiment, the first cooling assembly 30 comprises a first cooling channel (not shown in the figure), a first liquid inlet pipe 31, a first liquid outlet pipe 32 and a first liquid supply component, wherein: the first cooling channel is opened on the optical shaping device 22, the first liquid inlet pipe 31 is in communication with the first end of the first cooling channel, and the first liquid outlet pipe 32 is in communication with the second end of the first cooling channel; and the first liquid supply component is configured to supply cooling medium into the first cooling channel through the first liquid inlet pipe 31, and the cooling medium flows out from the first liquid outlet pipe 32 after passing through the first cooling channel, so as to implement liquid cooling on the optical shaping device 22.

[0052] Specifically, the cooling medium is any one of water or oil.

[0053] By opening the first cooling channel on the optical shaping device 22 and supplying the cooling medium into the first cooling channel through the first liquid supply component, the cooling medium can take away the heat of the optical shaping device 22 when flowing through the first cooling channel, thereby cooling the optical shaping device 22 and keeping the optical shaping device 22 at a suitable working temperature for a long time. Meanwhile, the first cooling assembly 30 cools the optical shaping device 22 by liquid cooling, which has the advantages of good cooling efficiency, good cooling effect and stable and reliable operation.

[0054] In an embodiment, the laser generating part 10 further comprises a collimator 12, which is arranged at the emitting end of the laser generator 11, and is configured to receive the laser beam emitted by the laser generator 11 and to collimate the received laser beam before transmitting it to the optical shaping device 22.

[0055] It should be noted that the laser beam emitted from the laser generator 11 usually has a certain divergence angle, and the collimator 12 is mainly used to adjust the divergent laser beam to a parallel beam; the collimator 12 can be a single lens, which can be a convex lens. When the divergent beam is incident on the convex lens, the beam can be changed to a parallel beam by reasonably selecting the focal length of the lens and the incident position of the beam. It can also be composed of two lenses. By optimizing the focal length, spacing and other parameters of the two lenses, the collimation effect can be improved, and the collimation effect can be improved. The common combination of collimator 12 is two convex lenses or one convex lens and one concave lens.

[0056] By arranging the collimator 12 at the emitting end of the laser generator 11, the collimator 12 focuses or diverges the laser beam, thereby collimating the laser beam and making the laser beam a parallel beam, thereby improving the utilization rate and transmission accuracy of the laser beam.

[0057] In an embodiment, the laser generating part 10 further comprises a second cooling assembly 13 configured to cool the collimator 12; the second cooling assembly 13 comprises a second cooling channel (not shown in the figure), a second liquid inlet pipe 130, a second liquid outlet pipe 131 and a second liquid supply component. The second cooling channel is arranged in the collimator 12, the second liquid inlet pipe 130 is in communication with the first end of the second cooling channel, and the second liquid outlet pipe 131 is in communication with the second end of the second cooling channel; the second liquid supply component is configured to supply cooling medium into the second cooling channel through the second liquid inlet pipe 130, and the cooling medium flows out from the second liquid outlet pipe 131 after passing through the second cooling channel to cool the working components of the collimator 12.

[0058] By arranging the second cooling channel in the collimator 12 and supplying the cooling medium into the second cooling channel through the second liquid supply component, the cooling medium can carry away the heat of the working components in the collimator 12 when flowing through the second cooling channel, thereby cooling the collimator 12 and keeping the collimator 12 at a suitable temperature for a long time. At the same time, the second cooling assembly 13 cools the collimator 12 by liquid cooling, which has the advantages of good cooling efficiency, good cooling effect and stable and reliable operation.

[0059] In an embodiment, the laser welding mechanism for the battery string further comprises a reflecting assembly 50 arranged on the propagation path of the laser beam, and the reflecting assembly 50 is configured to receive the laser beam propagating along the first direction (X) and to reflect the laser beam to the collimator 12. Figure 3The collimated laser beam propagating along the first direction is deflected by the reflection assembly 50 and propagates along the second direction towards the optical shaping device 22. Figure 3 The collimated laser beam propagating along the first direction is deflected by the reflection assembly 50 and propagates along the second direction towards the optical shaping device 22. Figure 3 The solid arrow in the figure shows the propagation path of the laser beam.

[0060] By arranging the reflection assembly 50 on the propagation path of the laser beam, the reflection assembly 50 deflects the collimated laser beam collimated by the collimator 12 and propagating along the first direction and makes it propagate along the second direction towards the optical shaping device 22, thereby achieving control of the propagation direction of the laser beam with good flexibility; meanwhile, it is also conducive to the reasonable layout of various functional components of the laser welding mechanism.

[0061] In an embodiment, the reflection assembly 50 comprises a base 51 and a mirror 52, wherein: the collimator 12 is mounted on the base 51 along the first direction, and the housing 21 is mounted on the base 51 along the second direction; the base 51 has a closed cavity 510 for mounting the mirror 52, and the mirror 52 is mounted in the cavity 510, so that the collimated laser beam collimated by the collimator 12 propagates along the first direction to the mirror 52 and then propagates along the second direction towards the optical shaping device 22 after being reflected by the mirror 52.

[0062] By arranging the mirror 52, the collimated laser beam collimated by the collimator 12 and propagating along the first direction is reflected and then propagates along the second direction towards the optical shaping device 22, thereby providing a reflection assembly 50 with simple structure and easy implementation; by mounting the mirror 52 in the closed cavity 510 in the base 51, the laser energy loss caused by external dust and impurities is prevented.

[0063] In an embodiment, the first end of the housing 21 is detachably fixedly mounted on the base 51 through a connecting flange 210, the second end of the housing 21 is detachably mounted with an end plate 211, and the optical shaping device 22 is detachably mounted on the end plate 211, and the end plate 211 and the housing 21 enclose a closed space for accommodating the optical shaping device 22.

[0064] Specifically, the first end of the housing 21 is fixedly connected with the connecting flange 210 through screws, the connecting flange 210 is fixedly mounted on the base 51 through screws, and the end plate 211 is fixedly mounted on the second end of the housing 21 through screws.

[0065] The first end of the housing 21 is mounted on the base 51 by connecting flange 210, which ensures the stability and airtightness of the connection between the housing 21 and the base 51, and facilitates the disassembly and assembly of the housing 21. By installing end plate 211 on the second end of the housing 21 and detachably mounting the optical shaping device 22 on end plate 211, a sealed space for accommodating the optical shaping device 22 is formed, which prevents external dust and impurities from causing laser energy loss, and facilitates subsequent maintenance and repair.

[0066] Please see Figure 2 and Figure 4 As shown, in one embodiment, the housing 21 has a light-transmitting hole, and a protective lens 212 for the linear laser 40 to pass through is installed in the light-transmitting hole.

[0067] By installing a protective lens 212 on the housing 21, the sealing of the enclosed space is ensured while the linear laser 40 passes through the protective lens 212 to perform welding on the welding point.

[0068] In one embodiment, the optical shaping device 22 is a copper integrating mirror. The integrating mirror includes a reflecting surface 220, through which the laser beam to be shaped generated by the laser generator 11 is received, and the received laser beam is shaped into a linear laser 40 before being emitted.

[0069] By setting the optical shaping device 22 as a copper integrating mirror, the integrating mirror divides the laser beam into several units and makes the light of each unit uniformly distributed. Then, through integration and focusing, the light of all units is superimposed on the working surface to obtain a uniform light spot, making the energy distribution of the linear laser 40 more uniform and improving the welding quality. At the same time, the use of a copper integrating mirror not only ensures the high temperature resistance of the optical shaping device 22, but also makes the optical shaping device 22 have good thermal conductivity, which is beneficial to improving the cooling effect of the first cooling component 30.

[0070] In one embodiment, the surface accuracy PV value of the reflective surface 220 is less than 0.35 μm, and the surface roughness Ra of the reflective surface 220 is less than 6 nm.

[0071] By setting the surface accuracy and surface roughness of the reflective surface 220, the flatness of the reflective surface 220 is ensured, thereby ensuring the shaping effect of the integrating mirror.

[0072] Please see Figure 2 and Figure 3As shown, the roughly working principle of the laser welding mechanism for the battery string provided by the embodiment of the present application is that the laser beam generated by the laser generator 11 to be shaped propagates along a first direction, the collimator 12 collimates the laser beam to be shaped, so that the laser beam becomes a parallel light beam propagating along the first direction, and then the parallel light beam is reflected by the mirror 52 and propagates along a second direction to the reflecting surface 220 of the integrating mirror, the parallel light beam received by the reflecting surface 220 of the integrating mirror is shaped into a linear laser, and then the linear laser is emitted along the second direction, and the laser welding is performed on the several welding points on the battery string which are on the same straight line.

[0073] The laser welding mechanism for the battery string provided by the embodiment of the present application has the following advantages:

[0074] 1) The laser shaping part is additionally provided with the first cooling assembly, the optical shaping device is cooled by the first cooling assembly, so as to reduce the temperature of the optical shaping device, the optical shaping device can adapt to a larger power laser generator, and then the heating temperature of the linear laser is improved, the linear laser can quickly heat and weld each row of welding points, and the laser welding efficiency is improved.

[0075] 2) The collimator is arranged on the laser generating part, the laser beam is adjusted into a parallel light beam, and the second cooling assembly cools the collimator, so as to reduce the temperature of the collimator, the collimator can adapt to a larger power laser generator, and the collimator can collimate the laser beam with a higher temperature.

[0076] 3) The reflecting assembly is arranged on the propagation path of the laser beam, the control of the propagation direction of the laser beam is realized, and the flexibility is good; meanwhile, the reasonable layout of the various functional parts of the laser welding mechanism is also beneficial.

[0077] 4) The end plate is mounted on the second end of the shell, and the optical shaping device is detachably mounted on the end plate, so as to form a closed space for accommodating the optical shaping device, the laser energy loss caused by the external dust impurities is prevented, and the subsequent maintenance and repair are facilitated.

[0078] The above embodiments only illustrate the basic principle and characteristics of the present application, the present application is not limited by the above examples, various changes and changes of the present application can be made without departing from the spirit and scope of the present application, and these changes and changes all fall within the scope of the present application. The scope of protection claimed by the present application is defined by the appended claims and their equivalents.

Claims

1. A laser welding mechanism for a battery string, characterized by, The laser welding mechanism for the battery string comprises a laser generating part, a laser shaping part and a first cooling assembly, wherein: The laser generating part comprises a laser generator configured to emit a laser beam to be shaped; The laser shaping part comprises a housing and an optical shaping device installed in the housing, the optical shaping device being configured to receive the laser beam to be shaped emitted by the laser generator and shape the received laser beam into a linear laser for laser welding on a plurality of welding points on the battery string in a same straight line; The first cooling assembly is configured to cool the optical shaping device.

2. The laser welding mechanism for a battery string according to claim 1, characterized by, The first cooling assembly comprises a first cooling channel, a first liquid inlet pipe, a first liquid outlet pipe and a first liquid supply component, wherein: The first cooling channel is arranged on the optical shaping device, the first liquid inlet pipe is in communication with a first end of the first cooling channel, and the first liquid outlet pipe is in communication with a second end of the first cooling channel; The first liquid supply component is configured to supply a cooling medium into the first cooling channel through the first liquid inlet pipe, and the cooling medium flows out of the first liquid outlet pipe after passing through the first cooling channel to implement liquid cooling on the optical shaping device.

3. The laser welding mechanism for a battery string of claim 1, wherein, The laser generating part further comprises a collimator, wherein: The collimator is arranged at an emission end of the laser generator, and the collimator is configured to receive the laser beam to be shaped emitted by the laser generator and propagate the received laser beam to the optical shaping device after collimation.

4. The laser welding mechanism for a battery string according to claim 3, characterized by, The laser generating part further comprises a second cooling assembly configured to cool the collimator; The second cooling assembly comprises a second cooling channel, a second liquid inlet pipe, a second liquid outlet pipe and a second liquid supply component, the second cooling channel being arranged in the collimator, the second liquid inlet pipe being in communication with a first end of the second cooling channel, and the second liquid outlet pipe being in communication with a second end of the second cooling channel; The second liquid supply component is configured to supply a cooling medium into the second cooling channel through the second liquid inlet pipe, and the cooling medium flows out of the second liquid outlet pipe after passing through the second cooling channel to implement liquid cooling on the working components of the collimator.

5. The laser welding mechanism for a battery string of claim 3, wherein, The laser welding mechanism for the battery string further comprises a reflection assembly arranged on a propagation path of the laser beam, the reflection assembly being configured to receive the laser beam collimated by the collimator propagating in a first direction and propagate the received laser beam in a second direction towards the optical shaping device after deflection, the first direction being perpendicular to the second direction.

6. The laser welding mechanism for a battery string of claim 5, wherein, The reflection assembly comprises a base and a reflecting mirror, wherein: The collimator is mounted on the base in the first direction, and the housing is mounted on the base in the second direction; The base has a sealed cavity for mounting the mirror, the mirror is mounted in the cavity, and the collimated laser beam propagates along the first direction to the mirror, is reflected by the mirror, and propagates along a second direction towards the optical shaping device.

7. The laser welding mechanism for a battery string of claim 6, wherein, The first end of the shell is detachably fixedly mounted on the base through a connecting flange, the second end of the shell is detachably mounted with an end plate, the optical shaping device is detachably mounted on the end plate, and the end plate and the shell are assembled to form a sealed space for accommodating the optical shaping device.

8. The laser welding mechanism for a battery string of claim 7, wherein, The shell is provided with a light-transmitting hole, and a protective lens for allowing the linear laser to pass through is mounted in the light-transmitting hole.

9. The laser welding mechanism for a battery string of claim 1, wherein, The optical shaping device is a copper integrating mirror, the integrating mirror includes a reflecting surface, receives the laser beam generated by the laser generator and to be shaped through the reflecting surface, and emits the linear laser after shaping the received laser beam.

10. The laser welding mechanism for a battery string of claim 9, wherein, The surface type precision PV value of the reflecting surface is less than 0.35 μm, and the surface roughness Ra of the reflecting surface is less than 6 nm.

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