Laser sintering module and battery piece laser sintering equipment and method

Abstract

The invention relates to the technical field of photovoltaic battery piece manufacturing, and particularly discloses a laser sintering module and a battery piece laser sintering device and method. The laser sintering module comprises at least two sets of power-up roll shaft assemblies arranged in the front-back direction and a laser assembly used for emitting laser to the position between the two sets of power-up roll shaft assemblies. The power-up roll shaft assembly comprises an upper roll shaft and a lower roll shaft which are oppositely arranged in the vertical direction. Each of the upper roll shaft and the lower roll shaft comprises a main shaft, an insulating layer arranged on the main shaft in a sleeving mode, a conductive layer arranged on the insulating layer in a sleeving mode and a plurality of electrode rings arranged on the conductive layer in a sleeving mode and arranged at intervals. The conductive layer of the upper roller shaft and the conductive layer of the lower roller shaft are electrically connected with the positive electrode and the negative electrode of the power source respectively. According to the device, the battery piece can be conveyed while voltage is applied to the battery piece, laser emitted by the laser assemblies can complete scanning of the whole battery piece, only one laser assembly is needed in the whole process, and the manufacturing cost of the device is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic cell manufacturing, and in particular to a laser sintering module, a cell laser sintering device and a method. Background Art

[0002] When a reverse voltage is applied to the cell, laser scanning of the gate line of the cell can significantly reduce the contact resistance between the gate line electrode and the silicon wafer, thereby improving the conversion efficiency of the cell.

[0003] In the current laser sintering module, when the cell is laser scanned, the cell is in a stationary state, and a reverse voltage is applied to the cell through a probe. Due to the obstruction of the probe, the laser component cannot completely scan the front surface of the cell at one time, and two sets of laser components are required, each set of laser components scans half of the cell, in order to achieve the purpose of completely scanning the front surface of the cell. In this way, the increase in the number of laser components leads to an increase in equipment costs, and the equipment structure is also more complicated. Summary of the invention

[0004] The object of the present invention is to provide a laser sintering module, a cell laser sintering device and a method that can transfer a cell while applying voltage to the cell.

[0005] To achieve the above object, the present invention provides a laser sintering module, comprising at least two groups of powered roller assemblies arranged along the front-to-back direction, and a laser assembly for emitting laser light between the two groups of powered roller assemblies;

[0006] The powered roller assembly comprises an upper roller and a lower roller which are arranged opposite to each other in the up-down direction, wherein the upper roller and the lower roller each comprise a main shaft, an insulating layer sleeved on the main shaft, a conductive layer sleeved on the insulating layer, and a plurality of electrode rings sleeved on the conductive layer and arranged at intervals;

[0007] The laser sintering module further includes a power supply, and the conductive layer of the upper roller and the conductive layer of the lower roller are electrically connected to the positive and negative electrodes of the power supply respectively.

[0008] As a further improvement of the present invention, the electrode ring on the upper roller shaft is a first electrode ring, and the electrode ring on the lower roller shaft is a second electrode ring. Multiple first electrode rings and multiple second electrode rings are staggered along a transverse direction perpendicular to the front-to-back direction so that the projections of multiple first electrode rings and multiple second electrode rings on a plane perpendicular to the up-down direction do not overlap; the upper roller shaft and the lower roller shaft also include multiple insulating rings sleeved on their conductive layers, the insulating ring on the upper roller shaft is a first insulating ring, and the insulating ring on the lower roller shaft is a second insulating ring. In the powered roller shaft assembly, multiple first electrode rings and multiple second insulating rings are aligned one by one along the up-down direction, and multiple second electrode rings and multiple first insulating rings are aligned one by one along the up-down direction.

[0009] As a further improvement of the present invention, the outer circumference of the electrode ring and the outer circumference of the insulating ring are both ring-shaped and have a width extending in a transverse direction.

[0010] As a further improvement of the present invention, the electrode ring and the insulating ring are made of flexible material, and the conductive layer is provided with a plurality of slots for defining the positions of the plurality of electrode rings and the plurality of insulating rings.

[0011] As a further improvement of the present invention, the conductive layer includes a plurality of conductive rings sleeved on the insulating layer, the conductive rings are provided with the slots, and the plurality of conductive rings are disposed separately.

[0012] As a further improvement of the present invention, the material of the electrode ring is one of conductive silicone rubber, conductive sponge and copper.

[0013] As a further improvement of the present invention, the conductive layer is made of one of copper, graphite, carbon fiber, aluminum and silver.

[0014] As a further improvement of the present invention, the wavelength of the laser emitted by the laser assembly is 400nm-1200nm, the size of the light spot in the front-to-back direction is 0.01mm-10mm, and the power of the laser assembly is 10W-300W.

[0015] As a further improvement of the present invention, the upper roller and the lower roller each further include a conductive slip ring connected to one end of the main shaft thereof, and the laser sintering module further includes a plurality of first wires and a second wire;

[0016] On the upper roller shaft, the conductive layer and the conductive slip ring are electrically connected through the first wire, and the conductive slip ring and the power supply are electrically connected through the second wire; on the lower roller shaft, the conductive layer and the conductive slip ring are electrically connected through the first wire, and the conductive slip ring and the power supply are electrically connected through the second wire.

[0017] The present invention also provides a cell laser sintering device, which includes the above-mentioned laser sintering module.

[0018] The present invention also provides a cell laser sintering method, which uses the above cell laser sintering equipment and includes the following steps:

[0019] Applying voltage to the battery cell and conveying the battery cell from back to front in a front-to-back direction;

[0020] emitting a laser toward the battery cell, wherein when the laser is emitted, a dot-shaped light spot is formed on the plane where the battery cell is located;

[0021] Moving the laser so that the light spot performs multiple cycles of scanning along a preset scanning path;

[0022] Assuming that in a transverse direction perpendicular to the front-rear direction, the two sides of the battery sheet are respectively a first side and a second side, the scanning path includes a first path moving from a first point on the first side to a second point on the second side, a second path moving backward from the second point to a third point, and a third path moving from the third point to the first side, and the first point is a starting point and an end point of the scanning path;

[0023] The first path extends obliquely from the back to the front or is parallel to the lateral direction, and the third path extends obliquely from the back to the front;

[0024] The third path moves from the third point to a fourth point on the first side of the battery sheet, and the scanning path also includes a fourth path moving backward from the fourth point to the first point.

[0025] Beneficial effects:

[0026] The laser sintering module, battery cell laser sintering equipment and method provided by the present invention can convey the battery cell while applying voltage to the battery cell, so that the laser emitted by the laser component can complete the scanning of the entire battery cell. Only one set of laser components is needed for the whole process, thereby reducing the manufacturing cost of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic structural diagram of a laser sintering module provided in one embodiment of the present invention;

[0028] Figure 2 A schematic side view of a laser sintering module provided in one embodiment of the present invention;

[0029] Figure 3 A front view schematic diagram of a laser sintering module provided in one embodiment of the present invention;

[0030] Figure 4 for Figure 3A schematic front view of the upper roller or the lower roller;

[0031] Figure 5 A schematic top view of a laser sintering module and a battery cell provided in one embodiment of the present invention;

[0032] Figure 6 A schematic front view of an upper roller or a lower roller provided in one embodiment of the present invention;

[0033] Figure 7 for Figure 6 A schematic diagram of the structure of the conductive ring, electrode ring and insulating ring in FIG.

[0034] Figure 8 Another structural schematic diagram of an upper roller or a lower roller provided in one embodiment of the present invention;

[0035] Fig. 9 A schematic diagram of a scanning path on a battery cell provided by an embodiment of the present invention;

[0036] Fig.10 A schematic diagram of a scan path provided by yet another embodiment of the present invention;

[0037] Fig.11 For the spot Fig. 9 The schematic diagram of the movement track and the scanned area on the battery cell when the scanning path is cyclically scanned is shown;

[0038] Fig.12 For the spot Fig.10 The scanning path shown is a schematic diagram of the movement trajectory on the battery cell and the scanned area when the scanning path is scanned in a loop. DETAILED DESCRIPTION

[0039] The present invention will be described in detail below in conjunction with the embodiments shown in the accompanying drawings. However, the embodiments do not limit the present invention, and any changes in mechanism, method, or function made by a person skilled in the art according to the embodiments are all within the protection scope of the present invention.

[0040] The terms used herein, such as "upper", "lower", "left", "right", "front", "back", etc., which indicate relative spatial positions, are used for the purpose of convenience to describe the relationship between one feature and another feature as shown in the accompanying drawings. It is understood that, depending on the placement of the product, the terms of relative spatial positions may be intended to include different orientations other than those shown in the drawings, and should not be construed as limitations on the claims. In addition, the descriptor "horizontal" used herein is not completely equivalent to being perpendicular to the direction of gravity, and a certain angle of inclination is allowed.

[0041] An embodiment of the present invention provides a laser sintering device, which is used to perform laser sintering on a battery cell 600 , and includes a laser sintering module 300 .

[0042] like Figure 1-5 As shown, the laser sintering module 300 includes at least two groups of powered roller assemblies 302 arranged along the front-to-back direction, and a laser assembly 301 for emitting laser light between the two groups of powered roller assemblies 302 .

[0043] The power roller assembly 302 includes an upper roller 302a and a lower roller 302b that are arranged opposite to each other in the up-down direction. The upper roller 302a and the lower roller 302b are driven to rotate by a motor and a transmission assembly. When the battery sheet 600 is arranged between the upper roller 302a and the lower roller 302b, the upper roller 302a and the lower roller 302b drive the battery sheet 600 to move in the front-back direction. The number of the power roller assembly 302 can be four or more.

[0044] The laser assembly 301 includes a laser source 301a, a laser shaping module 301b, a galvanometer 301c and a field lens 301d. The laser source 301a is used to emit laser light, the laser shaping module 301b is used to shape the spot of the laser light emitted by the laser source 301a into a square or a circle, the galvanometer 301c is used to receive the shaped laser light and adjust the scanning position, scanning amplitude and scanning speed of the laser spot according to the scanning parameters, and the field lens 301d is fixedly connected to the galvanometer 301c and is used to focus the laser light onto the surface of the battery cell 600 to form a spot on the surface of the battery cell 600. The spot of the laser light can be strip-shaped or dot-shaped.

[0045] The powered roller assembly 302 can drive the entire battery cell 600 to pass through the laser irradiation area, so that the laser can complete the scanning of the entire battery cell 600.

[0046] In this embodiment, the wavelength of the laser emitted by the laser component 301 is 400nm-1200nm, the size of the light spot in the front-to-back direction is 0.01mm-10mm, and the power of the laser component 301 is 10W-300W.

[0047] The laser can be a continuous laser or a pulsed laser, which are emitted by a continuous laser or a pulsed laser respectively. In this embodiment, a pulsed laser is preferably used, and the frequency of the laser emitted by the pulsed laser is 50KHZ-4000KHZ. The energy applied to the battery cell 600 by the pulsed laser is moderate.

[0048] Specifically, the upper roller 302a and the lower roller 302b each include a main shaft 3021, an insulating layer 3022 sleeved on the main shaft 3021, a conductive layer 3023 sleeved on the insulating layer 3022, and a plurality of electrode rings 3024 sleeved on the conductive layer 3023 and arranged at intervals. The laser sintering module 300 also includes a power supply 302c, and the conductive layer 3023 of the upper roller 302a and the conductive layer 3023 of the lower roller 302b are respectively electrically connected to the positive and negative electrodes of the power supply 302c, so that the plurality of electrode rings 3024 on the upper roller 302a and the plurality of electrode rings 3024 on the lower roller 302b can be respectively electrically connected to the positive and negative electrodes of the power supply 302c, and when the upper roller 302a and the lower roller 302b are transmitting the battery cell 600, the electrode rings 3024 are in contact with the battery cell 600.

[0049] With the above arrangement, the upper roller 302a and the lower roller 302b apply voltage to the battery cell 600 through the electrode ring 3024, and since an insulating layer 3022 is provided between the conductive layer 3023 and the main shaft 3021, the main shaft 3021 can be made of a metal material with higher strength without being charged.

[0050] The voltage is applied to the cell 600, specifically, a reverse voltage is applied to the front and back sides of the cell 600, and the voltage value is 10V-30V. When the reverse voltage is applied, the area on the cell 600 irradiated by the laser will generate an induced current, and when the induced current flows through the area with high resistance on the cell 600, that is, the junction between the gate electrode and the silicon wafer, a large amount of heat will be generated, and the gate electrode and the silicon wafer will be sintered, thereby reducing the contact resistance between the gate electrode and the silicon wafer, and improving the fill factor and conversion efficiency of the cell 600.

[0051] In specific configuration, the conductive layer 3023 on the upper roller 302a can be electrically connected to the negative electrode of the power source 302c, and the conductive layer 3023 on the lower roller 302b can be electrically connected to the positive electrode of the power source 302c. Alternatively, the conductive layer 3023 on the upper roller 302a can be electrically connected to the positive electrode of the power source 302c, and the conductive layer 3023 on the lower roller 302b can be electrically connected to the negative electrode of the power source 302c.

[0052] The electrode ring 3024 on the upper roller 302a is assumed to be a first electrode ring 3024a, and the electrode ring 3024 on the lower roller 302b is assumed to be a second electrode ring 3024b. In this embodiment, the first electrode ring 3024a and the second electrode ring 3024b are staggered in a transverse direction perpendicular to the front-to-back direction, so that the projections of the plurality of first electrode rings 3024a and the plurality of second electrode rings 3024b on a plane perpendicular to the up-down direction do not overlap.

[0053] It should be noted that, in this article, the front-to-back direction refers to the direction in which the laser sintering module 300 is located. Figure 2The left and right directions in the state shown are as follows: the horizontal direction is the direction in which the laser sintering module 300 is in the Figure 3 Left and right direction in the displayed state.

[0054] The thickness of the battery cell 600 is very small, usually about 100 μm. Therefore, in order to contact the battery cell 600, the gap between the first electrode ring 3024a and the second electrode ring 3024b in the vertical direction must also be set to be very small, or even 0. The first battery ring and the second electrode ring 3024b are staggered in the horizontal direction to avoid the first electrode ring 3024a and the second electrode ring 3024b from contacting each other and causing a short circuit.

[0055] Furthermore, the upper roller 302a and the lower roller 302b also include a plurality of insulating rings 3025 sleeved on the conductive layer 3023, wherein the insulating ring 3025 on the upper roller 302a is a first insulating ring 3025a, and the insulating ring 3025 on the lower roller 302b is a second insulating ring 3025b. In the powered roller assembly 302, the plurality of first electrode rings 3024a and the plurality of second insulating rings 3025b are arranged one by one in the vertical direction, and the plurality of second electrode rings 3024b and the plurality of first insulating rings 3025a are arranged one by one in the vertical direction, that is, in the vertical direction, each first electrode ring 3024a corresponds to a second insulating ring 3025b, and each second electrode ring 3024b corresponds to a first insulating ring 3025a.

[0056] Figure 3-6 In order to distinguish the electrode ring 3024 from the insulating ring 3025, a cross-hatching line is drawn on the insulating ring 3025.

[0057] The insulating ring 3025 is non-conductive and will not cause a short circuit when in contact with the electrode ring 3024. When the power roller assembly 302 is conveying the battery cell 600, the upper and lower opposite electrode rings 3024 and insulating rings 3025 respectively press against the front and back sides of the battery cell 600, so that the front and back sides of the battery cell 600 are evenly stressed, ensuring that the battery cell 600 will not be damaged. The insulating ring 3025 can be made of insulating rubber and other materials. When the battery cell 600 is not being conveyed, the electrode ring 3024 and the insulating ring 3025 can be in direct contact.

[0058] When the powered roller assembly 302 conveys the battery cell 600, the outer circumference of the electrode ring 3024 and the outer circumference of the insulating ring 3025 are in contact with the battery cell 600. In the present embodiment, the outer circumference of the electrode ring 3024 and the outer circumference of the insulating ring 3025 are both annular and have a width extending in the transverse direction. In this way, the electrode ring 3024 and the insulating ring 3025 have sufficient contact area to contact the battery cell 600, and the battery cell 600 is not easily crushed. In addition, the electrode ring 3024 also has sufficient area to contact the battery cell 600 to apply voltage to the battery cell 600.

[0059] In the lateral direction, the outermost electrode ring 3024 may extend beyond the edge of the battery cell 600 , or may not extend beyond the edge of the battery cell 600 .

[0060] In this embodiment, the battery cell 600 is an MBB type battery cell. This type of battery cell 600 includes a main grid line and a fine grid line in a network structure, wherein the main grid line ( Figure 5 The thick line portion in the cell 600) is consistent with the transmission direction of the cell 600, and the thin grid line ( Figure 5 The thin line portion in the cell 600 is perpendicular to the transmission direction of the cell 600. The plurality of electrode rings 3024 contact the plurality of main grid lines respectively, and apply voltage to the thin grid lines through the main grid lines.

[0061] In this embodiment, a plurality of slots 3023a-1 for limiting the positions of a plurality of electrode rings 3024 and a plurality of insulating rings 3025 are provided on the conductive layer 3023. The plurality of electrode rings 3024 and the plurality of insulating rings 3025 are all held in the slots 3023a-1 so as to be unable to slide in the lateral direction relative to the conductive layer 3023.

[0062] When installing the electrode ring 3024 and the insulating ring 3025, the electrode ring 3024 and the insulating ring 3025 need to be put on the conductive layer 3023 one by one from the end of the conductive layer 3023 and driven to slide on the conductive layer 3023 to the corresponding slot 3023a-1. In this case, the electrode ring 3024 and the insulating ring 3025 may need to be driven to slide a long distance on the conductive layer 3023 before they can be installed in the corresponding slot 3023a-1. For example, when installing the electrode ring 3024 and the insulating ring 3025 located in the middle of the conductive layer 3023, because the installation position is far from the end of the conductive layer 3023, during installation, they need to slide a long distance on the conductive layer 3023 before they can be moved to the slot 3023a-1 located in the middle of the conductive layer 3023.

[0063] The electrode ring 3024 and the insulating ring 3025 are made of flexible material. When they are put on the conductive layer 3023, if they are not in the slot 3023a-1, the electrode ring 3024 and the insulating ring 3025 are in a stretched state, and the friction between them and the conductive layer 3023 is relatively large. Therefore, the longer the distance that the electrode ring 3024 and the insulating ring 3025 need to slide on the conductive layer 3023 during installation, the more inconvenient the installation is.

[0064] In this regard, Figure 6-7 As shown, in one embodiment of the present invention, the conductive layer 3023 includes a plurality of conductive rings 3023a sleeved on the insulating layer 3022, a slot 3023a-1 is provided on the conductive ring 3023a, and the plurality of conductive rings 3023a are disposed separately.

[0065] In order to enable electrical connection between the multiple separated conductive rings 3023a, the conductive layer 3023 further includes a conductive member contacting the multiple conductive rings 3023a. Under the action of the conductive member, as long as one conductive ring 3023a in the upper roller 302a or the lower roller 302b is connected to the power source 302c, the other conductive rings 3023a will also be connected to the power source 302c. The conductive member can be a wire or a thin metal rod passing through the multiple conductive rings 3023a.

[0066] The number of the slots 3023a-1 on the conductive ring 3023a can be two, and the two slots 3023a-1 can respectively hold an electrode ring 3024 and an insulating ring 3025. During installation, the electrode ring 3024 and the insulating ring 3025 can be first installed on the conductive ring 3023a, and then the conductive ring 3023a can be sleeved on the insulating layer 3022, so that the electrode ring 3024 and the insulating ring 3025 are easily assembled. The conductive ring 3023a and the insulating layer 3022 can be fixed by a top screw structure to prevent the conductive ring 3023a from moving in the lateral direction on the insulating layer 3022.

[0067] It is conceivable that the number of the slots 3023a-1 on the conductive ring 3023a can be three, four or even more.

[0068] The electrode ring 3024 is made of conductive silicone rubber, conductive sponge, or copper. The electrode ring 3024 is preferably made of conductive silicone rubber, so that the electrode ring 3024 is conductive and flexible, and is not easy to damage the battery cell 600.

[0069] Conductive silicone rubber refers to silicone rubber in which conductive particles such as silver-plated glass, silver-plated aluminum, silver-plated copper, and pure silver are uniformly distributed. According to the different particles filled, conductive silicone rubber can be divided into silver-plated glass conductive silicone rubber, silver-plated aluminum conductive silicone rubber, silver-plated copper conductive silicone rubber, and pure silver conductive silicone rubber. In this embodiment, the electrode ring 3024 is preferably made of silver-plated copper conductive silicone rubber.

[0070] The conductive layer 3023 is made of one of copper, graphite, carbon fiber, aluminum, and silver, so as to have good conductive properties.

[0071] like Figure 8 As shown, the upper roller 302a and the lower roller 302b also include a conductive slip ring 3026 connected to one end of the main shaft 3021 thereof, and the laser sintering module 300 also includes a plurality of first wires and second wires (not shown in the figure). On the upper roller 302a, the conductive layer 3023 and the conductive slip ring 3026 are electrically connected via the first wire, and the conductive slip ring 3026 and the power supply 302c are electrically connected via the second wire.

[0072] Similarly, on the lower roller 302b, the conductive layer 3023 and the conductive slip ring 3026 are electrically connected via a first wire, and the conductive slip ring 3026 and the power source 302c are electrically connected via a second wire. The conductive slip ring 3026 is disposed between the power source 302c and the conductive layer 3023 to ensure that the wire electrically connecting the conductive layer 3023 and the power source 302c will not be entangled when the upper roller 302a and the lower roller 302b rotate.

[0073] In summary, the laser sintering module 300 and the cell laser sintering equipment provided by the present invention can convey the cell 600 while applying voltage to the cell 600, and the laser emitted by the laser component 301 can complete the scanning of the entire cell 600. The whole process only requires one set of laser components 600, thereby reducing the manufacturing cost of the equipment.

[0074] like Figure 9-10 As shown, the present invention also provides a cell laser sintering method, which uses the above-mentioned cell laser sintering equipment and includes the following steps:

[0075] Applying voltage to the battery cell 600 and conveying the battery cell 600 from back to front in the front-back direction, Figure 9-12 The arrow on the right shows the anterior-posterior direction;

[0076] The laser is emitted toward the battery cell 600. When the laser is emitted, a dot-shaped light spot is formed on the plane where the battery cell 600 is located. When the light spot is located on the battery cell 600, a certain area on the battery cell 600 will be correspondingly irradiated. For example, when the laser irradiates the battery cell 600 from top to bottom, a certain area on the upper surface of the battery cell 600 will be correspondingly irradiated.

[0077] The laser is moved so that the light spot performs multiple cycles of scanning along a preset scanning path.

[0078] In the transverse direction perpendicular to the front-rear direction, the two sides of the battery cell 600 are respectively the first side and the second side. Fig. 9 The middle is the left and right direction, Fig. 9 In the embodiment, the left side of the battery cell 600 is the first side, and the right side is the second side. In other embodiments, the right side of the battery cell 600 may be the first side, and the left side may be the second side.

[0079] The scanning path includes a first point O from a first side 1 Move to the second point O on the second side 2 The first path S1, from the second point O 2 Move back to the third point O 3 The second path S2 and the path from the third point O 3 Move to the third path S3 of the first side. The scanning path is a closed loop path. 1is the starting point and the end point of the scanning path, that is, after the irradiation point moves from the second side to the first side along the third path S3, it will return to the first point O 1 .

[0080] The first path S1 extends obliquely from the back to the front or is parallel to the transverse direction, and the third path S3 extends obliquely from the back to the front.

[0081] When the battery cell 600 is transported from the back to the front, the light spot is formed along the first path S1 from the first point O on the first side. 1 Move to the second point O on the second side 2 , will scan part of the cell 600 and radiate the scanned area. After passing through the first path S1, the light spot moves from front to back along the second path S2, and then moves from back to front along the third path S3. In this way, it is possible to avoid the overlap of the area on the cell 600 scanned by the light spot along the third path S3 and the area on the cell 600 previously scanned by the light spot along the first path S1. The light spot can scan as much area on the cell 600 as possible, and the scanning path can eventually return to the first point O. 1 .

[0082] It should be understood that when the light spot moves along the first path S1 or the third path S3, if the movement of the battery cell 600 from back to front is synchronized with the movement of the light spot from back to front, the area swept by the light spot on the battery cell 600 is parallel to the lateral direction; if the movement of the battery cell 600 from back to front is not synchronized with the movement of the light spot from back to front, the area swept by the light spot on the battery cell 600 is inclined relative to the lateral direction.

[0083] like Fig. 9 As shown, in one embodiment of the present invention, the third path S3 starts from the third point O 3 Move to the fourth point O on the first side of the battery cell 600 3 , the scanning path also includes the fourth point O 3 Move back to the first point O 1 Thus, the scanning path is generally in the shape of a figure 8 or an hourglass, and the light spot is cyclically scanned along the scanning path in the shape of a figure 8 or an hourglass.

[0084] Specifically, the first path S1 extends obliquely from the back to the front, and when the light spot moves along the first path S1, it not only moves from the first side to the second side in the transverse direction, but also moves forward a certain distance in the front-to-back direction. As described above, the third path S3 extends obliquely from the back to the front, and when the light spot moves along the third path S3, it not only moves from the second side to the first side in the transverse direction, but also moves forward a certain distance in the front-to-back direction.

[0085] First point O 1 and the second point O 2The distance in the front-back direction, the third point O 3 and the fourth point O 3 The distance in the front-to-back direction and the second point O 2 and the third point O 3 The distances in the front-to-back direction are all equal to H. The distance that the light spot moves forward when it moves along the first path S1 is H, and the distance that the light spot moves forward when it moves along the third path S3 is also H.

[0086] It can be imagined that in the above case, the fourth point O 3 and the first point O 1 The distance in the front-to-back direction is also equal to H. When the light spot completes one scan, the distance that the battery cell 600 moves forward is equal to 2H.

[0087] In this embodiment, both ends of the first path S1 and both ends of the third path S3 extend beyond the battery cell 600 in the lateral direction. Thus, when the light spot moves along the first path S1 and the third path S3, it can completely scan the battery cell 600 in the lateral direction. The light spot scans in a cycle multiple times along the scanning path, and the scanned area can cover the battery cell 600.

[0088] Those skilled in the art can imagine that the length of the first path S1 and the length of the third path S3 are related to the size of the battery cell 600 in the lateral direction, and the length of the second path S2 (i.e., the length of the second point O 2 and the third point O 3 The length of the fourth path S4 (i.e., the fourth point O 3 and the first point O 1 The distance in the front-to-back direction) is related to the size H occupied by the light spot in the front-to-back direction. For example, in this embodiment, the size occupied by the battery cell 600 in the transverse direction is 182mm, the length of the first path S1 and the third path S3 is slightly larger than 182mm, about 190mm, and the length of the second path S2 and the fourth path S4 are both equal to H, which is 2.5mm. Obviously, the length of the first path S1 and the length of the third path S3 are much larger than the length of the second path S2 and the fourth path S4. Therefore, in the process of moving along the scanning path, the light spot is used to move along the first path S1 and the third path S3 most of the time, and the time moving along the second path S2 and the fourth path S4 can be ignored.

[0089] Specifically, the ratio of the length of the first path or the third path to the size H of the light spot in the front-to-back direction is not less than 10.

[0090] The lengths of the first path S1 and the third path S3 are equal, and the lengths of the second path S2 and the fourth path S4 are also equal. If the cell 600 moves forward at a constant speed, the distance 2H that the cell 600 moves forward during a scan by the light spot can be divided into: 1 Move to the second point O 2 When the cell 600 moves forward by a distance H, the light spot moves from the third point O along the third path S3. 3 Move to the fourth point O 3 When the light spot moves forward along the first path S1, the battery cell 600 moves forward by a distance of H. Since the light spot moves forward by a distance of H when it moves along the first path S1 and by a distance of H when it moves along the third path S3, when the light spot moves along the first path S1 and the third path S3, the battery cell 600 moves synchronously with the light spot. Thus, when the light spot scans cyclically along the scanning path, the several strip-shaped areas scanned by the light spot on the battery cell 600 are parallel to the transverse direction and cover the battery cell 600, and the light spot can basically scan all areas of the battery cell 600. Fig.11 It is a schematic diagram of the moving track and the scanned area of ​​the light spot on the battery cell 600 when the light spot is scanned according to the scanning path of this embodiment.

[0091] It can be understood that the first point O 1 and the second point O 2 The distance in the front-back direction, the third point O 3 and the fourth point O 3 The distance in the front-to-back direction and the second point O 2 and the third point O 3 The distance in the front-to-back direction may also be slightly larger or smaller than the size H of the light spot in the front-to-back direction.

[0092] The relationship between the moving speed of the light spot and the forward moving speed of the battery cell 600 is described below by an example. Assume that the light spot is a rectangular laser light spot of 2.5 mm*2.5 mm, and its size in the front-to-back direction is H=2.5 mm. The first point O 1 and the second point O 2 The distance in the lateral direction and the third point O 3 and the fourth point O 3The distance in the horizontal direction is equal to 190mm, the length of the first path S1 and the third path S3 is approximately equal to 190mm, and the length of the second path S2 and the fourth path S4 is 2.5mm. In this way, the length of the entire scanning path is approximately 190mm*2+2.5*2=385mm. Assuming that the transmission speed of the battery cell 600 is 300mm / s, the time required for it to move forward a distance of 2H is 5mm÷300mm / s=0.017s, then the moving speed of the light spot should be 385mm÷0.017=22647mm / s. In summary, if the transmission speed of the battery cell 600 is 300mm / s, the moving speed of the light spot should be 22647mm / s, so that the area scanned by the light spot can basically cover the battery cell 600. If the transmission speed of the battery cell 600 is greater than 300 mm / s, some areas on the battery cell 600 will not be scanned, resulting in missed scanning. On the contrary, some areas on the battery cell 600 will be scanned repeatedly.

[0093] It is conceivable that in some scenarios, the moving speed of the light spot or the forward transmission speed of the battery cell 600 can be adjusted to meet special requirements of missed scanning or repeated scanning.

[0094] In another embodiment of the present invention, Fig.10 As shown, the difference between this embodiment and the previous embodiment is that, in this embodiment, the first path S1 is parallel to the transverse direction, that is, the first point O 1 and the second point O 2 The distance in the front-to-back direction is 0, and the light spot moves along the first path S1, moving from the first side to the second side in the transverse direction, but the position in the front-to-back direction remains unchanged. 3 and the fourth point O 3 The distance in the front-to-back direction is 2H, and the light spot moves along the third path S3, not only from the second side to the first side, but also from the back to the front by a distance of 2H. 3 and the first point O 1 The distance in the front-to-rear direction, ie, the length of the fourth path S4, is equal to H.

[0095] In this embodiment, the length of the third path S3 is slightly greater than the length of the first path S1, and the lengths of the second path S2 and the fourth path S4 are equal. If the cell 600 moves forward at a constant speed, the distance 2H that the cell 600 moves forward during a scan of the light spot can be divided into: the distance 2H that the light spot moves forward along the first path S1 from the first point O 1 Move to the second point O 2 When the cell 600 moves forward by a distance H, the light spot moves from the third point O along the third path S3. 3 Move to the fourth point O 3When the light spot moves forward along the first path S1, the distance moved forward is 0, the movement of the cell 600 and the light spot is not synchronized, and the difference between the moving distances is H. Accordingly, the strip area swept by the light spot on the cell 600 extends obliquely from front to back relative to the transverse direction. When the light spot moves forward along the third path S3, the distance moved forward is 2H, therefore, the movement of the cell 600 and the light spot is not synchronized, and the difference between the moving distances is also H. Accordingly, the strip area swept by the light spot on the cell 600 extends obliquely from back to front relative to the transverse direction. Fig.12 It is a schematic diagram of the moving track and the scanning area of ​​the light spot on the battery cell 600 when the light spot scans according to the scanning path of this embodiment.

[0096] When the light spot is cyclically scanned according to the scanning path of this embodiment, the strip area swept on the battery when moving along the first path S1 and the strip area swept on the battery cell 600 when moving along the third path S3 are parallel and cover the battery cell 600, and the light spot can basically sweep all areas of the battery cell 600.

[0097] In summary, the battery cell laser sintering method provided by the present invention applies voltage to the battery cell 600 during the transportation of the battery cell 600, and during the transportation of the battery cell 600, a laser with a point-shaped light spot is moved according to a preset scanning path. The area scanned by the laser can cover the battery cell 600 well, and the energy applied to the battery cell 600 is moderate.

[0098] It should be understood that although the present specification is described according to embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0099] The above embodiments are only used to illustrate the technical solution of the present application and are not intended to limit it. Although the present application has been described in detail with reference to the preferred embodiments, a person skilled in the art should understand that the technical solution of the present application may be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present application.

Claims

1. A laser sintering module, characterized in that: It comprises at least two groups of powered roller shaft assemblies arranged in the front-to-back direction, and a laser assembly for emitting laser light between the two groups of powered roller shaft assemblies; The powered roller assembly comprises an upper roller and a lower roller which are arranged opposite to each other in the up-down direction, wherein the upper roller and the lower roller each comprise a main shaft, an insulating layer sleeved on the main shaft, a conductive layer sleeved on the insulating layer, and a plurality of electrode rings sleeved on the conductive layer and arranged at intervals; The laser sintering module further includes a power supply, and the conductive layer of the upper roller and the conductive layer of the lower roller are electrically connected to the positive and negative electrodes of the power supply respectively.

2. The laser sintering module according to claim 1, characterized in that: The electrode ring on the upper roller is a first electrode ring, and the electrode ring on the lower roller is a second electrode ring. The plurality of first electrode rings and the plurality of second electrode rings are staggered along a transverse direction perpendicular to the front-to-back direction so that the projections of the plurality of first electrode rings and the plurality of second electrode rings on a plane perpendicular to the up-down direction do not overlap; the upper roller and the lower roller also include a plurality of insulating rings sleeved on their conductive layers, the insulating ring on the upper roller is a first insulating ring, and the insulating ring on the lower roller is a second insulating ring. In the powered roller assembly, the plurality of first electrode rings and the plurality of second insulating rings are aligned one by one along the up-down direction, and the plurality of second electrode rings and the plurality of first insulating rings are aligned one by one along the up-down direction.

3. The laser sintering module according to claim 2, characterized in that: The outer circumference of the electrode ring and the outer circumference of the insulating ring are both ring-shaped and have a width extending in a transverse direction.

4. The laser sintering module according to claim 3, characterized in that: The electrode ring and the insulating ring are made of flexible material, and the conductive layer is provided with a plurality of slots for defining the positions of the plurality of electrode rings and the plurality of insulating rings.

5. The laser sintering module according to claim 4, characterized in that: The conductive layer comprises a plurality of conductive rings sleeved on the insulating layer, the conductive rings are provided with the clamping grooves, and the plurality of conductive rings are arranged separately.

6. The laser sintering module according to claim 1, characterized in that: The electrode ring is made of one of conductive silicone rubber, conductive sponge and copper.

7. The laser sintering module according to claim 1, characterized in that: The conductive layer is made of one of copper, graphite, carbon fiber, aluminum and silver.

8. The laser sintering module according to claim 1, characterized in that: The upper roller and the lower roller each further include a conductive slip ring connected to one end of the main shaft thereof, and the laser sintering module further includes a plurality of first wires and a second wire; On the upper roller shaft, the conductive layer and the conductive slip ring are electrically connected through the first wire, and the conductive slip ring and the power supply are electrically connected through the second wire; on the lower roller shaft, the conductive layer and the conductive slip ring are electrically connected through the first wire, and the conductive slip ring and the power supply are electrically connected through the second wire.

9. A cell laser sintering device, characterized in that: The laser sintering module comprises any one of claims 1 to 8.

10. A method for laser sintering a battery cell, characterized in that: The cell laser sintering device according to claim 9 is used, and includes the following steps: Applying voltage to the battery cell and conveying the battery cell from back to front in a front-to-back direction; emitting a laser toward the battery cell, wherein when the laser is emitted, a dot-shaped light spot is formed on the plane where the battery cell is located; Moving the laser so that the light spot performs multiple cycles of scanning along a preset scanning path; Assuming that in a transverse direction perpendicular to the front-rear direction, the two sides of the battery sheet are respectively a first side and a second side, the scanning path includes a first path moving from a first point on the first side to a second point on the second side, a second path moving backward from the second point to a third point, and a third path moving from the third point to the first side, and the first point is a starting point and an end point of the scanning path; The first path extends obliquely from the back to the front or is parallel to the lateral direction, and the third path extends obliquely from the back to the front; The third path moves from the third point to a fourth point on the first side of the battery sheet, and the scanning path also includes a fourth path moving backward from the fourth point to the first point.

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