Battery piece sintering equipment

Abstract

The utility model discloses battery piece sintering equipment. The battery piece sintering equipment comprises a low-temperature sintering box, a secondary sintering box and a conveyor belt assembly, wherein the low-temperature sintering box is used for carrying out low-temperature sintering on a battery piece to be sintered; the secondary sintering box is positioned at the downstream of the low-temperature sintering box and is used for carrying out secondary sintering on the battery pieces subjected to low-temperature sintering; the conveying belt assembly sequentially penetrates through the low-temperature sintering box and the secondary sintering box and is used for sequentially conveying battery pieces to be sintered into the low-temperature sintering box and the secondary sintering box in the first direction. According to the battery piece sintering equipment, the two working procedures of low-temperature sintering and secondary sintering can be completed in one set of equipment, the production efficiency is effectively improved, and the workload of workers can be effectively reduced.

Description

Technical Field

[0001] The present application relates to the technical field of battery cell production equipment, and in particular to a battery cell sintering equipment. Background Art

[0002] In the process of manufacturing solar cells, it is usually necessary to go through the following processes: silicon wafer cutting and preparation, removal of damaged layers, silicon wafer cleaning, texturing, passivation of anti-reflection film, screen printing of PN zone metal electrodes, low-temperature sintering, secondary sintering (photoelectric simultaneous processing), string welding, component packaging, etc. Among them, high-temperature sintering furnaces and laser processing equipment are required for low-temperature sintering and secondary sintering respectively.

[0003] In related technologies, high-temperature sintering furnaces use motors to drive the battery cells through temperature zones of different temperatures to achieve high-temperature / low-temperature sintering of the gate lines; laser processing equipment controls laser wavelength, power, spot and other parameters to achieve front electrode processing, back electrode processing, selective laser melting, laser drilling and laser annealing.

[0004] However, completing low-temperature sintering and secondary sintering in two sets of equipment, a high-temperature sintering furnace and a laser processing device, requires an additional step of transferring the battery cells, resulting in poor production efficiency. Utility Model Content

[0005] The present application discloses a battery cell sintering device, which can complete two processes of low-temperature sintering and secondary sintering in one set of equipment, effectively improving production efficiency and effectively reducing the workload of staff.

[0006] In order to achieve the above-mentioned purpose, the present application discloses a battery cell sintering device, comprising:

[0007] A low temperature sintering box, which is used to perform low temperature sintering on the battery cells to be sintered;

[0008] A secondary sintering box, which is located downstream of the low-temperature sintering box and is used to perform secondary sintering on the battery cell that has completed low-temperature sintering;

[0009] A conveyor belt assembly, wherein the conveyor belt assembly passes through the low-temperature sintering box and the secondary sintering box in sequence, and the conveyor belt assembly is used to convey the battery cells to be sintered to the low-temperature sintering box and the secondary sintering box in sequence along a first direction.

[0010] In a possible implementation, along the first direction, the low-temperature sintering box and the secondary sintering box are disposed adjacent to each other, and an outlet of the low-temperature sintering box is connected to an inlet of the secondary sintering box.

[0011] In one possible implementation, the low-temperature sintering box and the secondary sintering box are connected via a heat insulating member, which is movably arranged in a vertical direction relative to the conveyor belt assembly, and is used to adjust the size of the communication port between the low-temperature sintering box and the secondary sintering box.

[0012] In one possible implementation, the thermal insulation member is slidably connected to the secondary sintering box along the vertical direction, and the battery cell sintering equipment also includes a driving member, a driving end of which is connected to the thermal insulation member, and is used to drive the thermal insulation member to move along the vertical direction toward or away from the conveyor belt assembly.

[0013] In a first possible implementation, a heating element is provided in the low-temperature sintering box, and the heating element is used to perform low-temperature sintering on the battery cell to be sintered;

[0014] A laser light emitter is arranged in the secondary sintering box, and the laser light emitter is used to perform secondary sintering on the battery cell that has completed low-temperature sintering.

[0015] In a first possible implementation manner, an inert gas emitter is further provided in the secondary sintering box, and the inert gas emitter is arranged close to an inlet of the secondary sintering box relative to the laser light emitter.

[0016] In one possible implementation, the conveyor belt assembly includes a first conveyor belt and a second conveyor belt arranged along the first direction, the first conveyor belt is used to convey the battery cells to be sintered into the low-temperature sintering box, and the second conveyor belt is used to convey the battery cells that have completed low-temperature sintering and are conveyed from the first conveyor belt to the secondary sintering box.

[0017] In a possible implementation, there is a gap between the first conveyor belt and the second conveyor belt, and along the first direction, a size of the gap is smaller than half of the length of the battery cell.

[0018] In one possible implementation, the battery cell sintering equipment also includes a control unit, which is electrically connected to the second conveyor belt, and the control unit is used to control the speed of the second conveyor belt to v1 when the battery cell is sintered by the laser light emitter in the secondary sintering box, and control the speed of the second conveyor belt to v2 after the sintering of the laser light emitter is completed, and v1>v2.

[0019] In a possible implementation manner, the thermal conductivity of the second conveyor belt is lower than the thermal conductivity of the first conveyor belt.

[0020] Compared with the prior art, the beneficial effects of this application are:

[0021] In the present application, the secondary sintering box is located downstream of the low-temperature sintering box, and the conveyor belt assembly passes through the low-temperature sintering box and the secondary sintering box in sequence, and is used to convey the battery cells to be sintered to the low-temperature sintering box and the secondary sintering box in sequence, so that the battery cells can be low-temperature sintered in the low-temperature sintering box, and after the low-temperature sintering is completed, they can be moved to the secondary sintering box for secondary sintering through the conveyor belt assembly, that is, photoelectric synchronous processing is performed, so that after the battery cells are sintered, perfect contact conductivity can be formed without damaging the surface of the PN junction. Compared with the method of performing low-temperature sintering and secondary sintering on the battery cells respectively through two sets of equipment, a high-temperature sintering furnace and a laser processing equipment, on the first hand, the low-temperature sintering and secondary sintering of the battery cells can be completed by a set of sintering equipment, which effectively improves the production efficiency of the battery cells. ; Secondly, there is no need to set up a separate handling equipment between the high-temperature sintering furnace and the laser processing equipment to transfer the battery cells that have completed low-temperature sintering. The battery cells that have completed low-temperature sintering can be promptly transported to the secondary sintering box for secondary sintering through the conveyor belt assembly, which not only reduces the workload of the staff, but also can further improve the production efficiency of the battery cells; Thirdly, the conveyor belt assembly passes through the secondary sintering box, and the conveying speed of the conveyor belt assembly can be controlled to control the laser processing time and annealing time of the battery cells in the secondary sintering box, so that the battery cells can more easily obtain a longer annealing time in the secondary sintering box, and can obtain silver dendrites with larger particles, so that the contact conductivity between the silver dendrites and the PN junction has better performance, thereby improving the manufacturing quality of the battery cells. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 is a three-dimensional diagram of a cell sintering device provided in an embodiment of the present application;

[0024] Figure 2 is a three-dimensional diagram of a cell sintering device provided in an embodiment of the present application when a second cover is not provided;

[0025] Figure 3 is a three-dimensional diagram of a cell sintering device provided in an embodiment of the present application when the first cover is not provided;

[0026] Figure 4 yes Figure 3 A magnified view of position A in FIG.

[0027] Figure 5It is a three-dimensional diagram of a cell sintering device provided in an embodiment of the present application when the first cover body and the second cover body are not provided;

[0028] Figure 6 It is a stereoscopic diagram of a transmission component provided in an embodiment of the present application.

[0029] Description of reference numerals:

[0030] 1- low temperature sintering box; 11- outlet of low temperature sintering box; 12- first cover; 13- first box bottom; 14- heating element; 2- secondary sintering box; 21- inlet of secondary sintering box; 22- second cover; 23- second box bottom; 24- laser emitter; 25- inert gas emitter; 3- conveyor belt assembly; 31- first conveyor belt; 32- second conveyor belt; 33- interval; 4- heat insulation element;

[0031] 10-battery cell sintering equipment; 20-battery cell. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0033] In this application, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0034] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0035] In the related art, when sintering the battery cell, the battery cell to be sintered is first placed in a high-temperature sintering furnace, and the sintering temperature is controlled between 750°C and 800°C for low-temperature sintering, so that the PN junction surface of the battery cell is not easily damaged during the low-temperature sintering process. The battery cell is then moved into a laser processing device for secondary sintering. Through the secondary sintering (photoelectric synchronous processing), that is, using a laser to irradiate the metal electrode of the battery cell at room temperature, the electrons provided by the laser reduce the Ag+ in the Ag (silver) ion metal slurry to Ag, and the reduced Ag forms silver dendrites and contacts the PN junction for conductivity. In this way, the battery cell can form perfect contact conductivity without damaging the PN junction surface after low-temperature sintering and secondary sintering.

[0036] However, the above-mentioned method of low-temperature sintering and secondary sintering of battery cells requires the use of two devices, a high-temperature sintering furnace and a laser processing device. In addition, the battery cells that have completed low-temperature sintering need to be transported to the laser processing equipment, which not only increases the workload of the staff and the production cost of the battery cells, but also leads to lower production efficiency of the battery cells.

[0037] In view of this, the present application discloses a battery cell sintering device, which can complete two processes of low-temperature sintering and secondary sintering in one set of equipment, effectively improving production efficiency and effectively reducing the workload of staff.

[0038] The technical solution of the present application will be further described below in conjunction with specific embodiments and drawings.

[0039] This embodiment provides a battery cell sintering device, such as Figure 1 As shown, the cell sintering equipment 10 includes a low-temperature sintering box 1, a secondary sintering box 2, and a conveyor assembly. The low-temperature sintering box 1 is used to perform low-temperature sintering on the cell 20 to be sintered; the secondary sintering box 2 is located downstream of the low-temperature sintering box 1, and is used to perform secondary sintering on the cell 20 that has completed low-temperature sintering; the conveyor assembly passes through the low-temperature sintering box 1 and the secondary sintering box 2 in sequence, and the conveyor assembly is used to convey the cell 20 to be sintered to the low-temperature sintering box 1 and the secondary sintering box 2 in sequence along the first direction.

[0040] In this embodiment, the secondary sintering box 2 is located downstream of the low-temperature sintering box 1, and the conveyor belt assembly passes through the low-temperature sintering box 1 and the secondary sintering box 2 in sequence, and is used to convey the battery cell 20 to be sintered to the low-temperature sintering box 1 and the secondary sintering box 2 in sequence, so that the battery cell 20 can be low-temperature sintered in the low-temperature sintering box 1, and after completing the low-temperature sintering, it can be moved to the secondary sintering box 2 for secondary sintering through the conveyor belt assembly, that is, photoelectric synchronous processing is performed, so that after the battery cell 20 is sintered, it can form a perfect contact conductivity without damaging the PN junction surface. Compared with the method of performing low-temperature sintering and secondary sintering on the battery cell 20 respectively by two sets of equipment, a high-temperature sintering furnace and a laser processing equipment, on the first hand, the low-temperature sintering and secondary sintering of the battery cell 20 can be completed by a set of sintering equipment, which effectively improves the production of the battery cell 20. efficiency; secondly, there is no need to set up a separate handling equipment between the high-temperature sintering furnace and the laser processing equipment to transfer the battery cell 20 that has completed low-temperature sintering. The battery cell 20 that has completed low-temperature sintering can be promptly transported to the secondary sintering box 2 for secondary sintering through the conveyor belt assembly, which not only reduces the workload of the staff, but also can further improve the production efficiency of the battery cell 20; thirdly, the conveyor belt assembly passes through the secondary sintering box 2, and the conveying speed of the conveyor belt assembly can be controlled to control the laser processing time and annealing time of the battery cell 20 in the secondary sintering box 2, so that the battery cell 20 can more easily obtain a longer annealing time in the secondary sintering box 2, and can obtain silver dendrites with larger particles, so that the contact conductivity between the silver dendrites and the PN junction has better performance, thereby improving the manufacturing quality of the battery cell 20.

[0041] It should be understood that the secondary sintering box 2 being located downstream of the low-temperature sintering box 1 means that in the manufacturing process, the secondary sintering box 2 is located downstream of the low-temperature sintering box 1, and it does not mean that the secondary sintering box 2 is located below or behind the low-temperature sintering box 1 in terms of layout.

[0042] It should also be understood that, since the silver particles will be pre-melted when the surface of the battery cell 20 is reheated, and the melting point of the silver particles is inversely proportional to the radius of the silver particles, the smaller the size of the silver particles, the higher the sintering activity. Smaller silver particles are easier to melt, resulting in deterioration of the contact performance between the silver dendrites and the PN junction. Therefore, after the battery cell 20 is subjected to secondary sintering, that is, after the photoelectric synchronous treatment, the silver particles formed by reduction should be as large as possible. In addition, the size of the grain is inversely proportional to the annealing rate, that is, the faster the annealing speed of the battery cell 20 after the secondary sintering, the smaller the silver particles and the smaller the silver dendrites formed. Therefore, when the battery cell 20 is subjected to secondary sintering, the slower the annealing rate after the battery cell 20 is sintered by laser, the larger the silver dendrites formed, which is more conducive to improving the contact conductivity between the silver dendrites and the PN junction, thereby improving the conductivity of the battery cell 20.

[0043] The above-mentioned conveyor belt assembly passes through the low-temperature sintering box 1 and the secondary sintering box 2 in sequence. The conveyor belt assembly can be first passed through the inlet of the low-temperature sintering box 1, and passes through the low-temperature sintering box 1, passes out from the outlet 11 of the low-temperature sintering box, and then passes through the inlet 21 of the secondary sintering box to enter the secondary sintering box 2, and then passes through the outlet of the secondary sintering box 2 to the outside of the secondary sintering box 2.

[0044] Alternatively, if Figure 1-Figure 3 As shown, along the first direction (such as Figure 1 The low temperature sintering box 1 is adjacent to the secondary sintering box 2, and the outlet 11 of the low temperature sintering box is connected to the inlet 21 of the secondary sintering box.

[0045] In this way, more heat in the low-temperature sintering box 1 can be transferred to the secondary sintering box 2. For example, the residual heat after low-temperature sintering can be transferred to the secondary sintering box 2, so that the secondary sintering box 2 can obtain a higher initial temperature. Compared with the method of using laser to irradiate the metal electrode of the battery cell 20 for secondary sintering at room temperature, a low-power laser can be selected for photoelectric synchronous processing, thereby effectively reducing the probability of lattice damage to the battery cell 20 during the secondary sintering process.

[0046] In addition, the secondary sintering box 2 has a higher initial temperature, which can effectively extend the annealing time of the battery cell 20 during the secondary sintering, thereby making the silver grains larger and providing better contact and conductive properties between the silver dendrites and the PN junction, which is beneficial to improving the conductive properties of the battery cell 20.

[0047] Among them, the low-temperature sintering box 1 and the secondary sintering box 2 are arranged adjacent to each other. The interval 33 between the secondary sintering box 2 and the low-temperature sintering box 1 can be small, and the inlet 21 of the secondary sintering box can be connected with the outlet 11 of the low-temperature sintering box through a channel; or the secondary sintering box 2 and the low-temperature sintering box 1 are closely connected, and the inlet 21 of the secondary sintering box is directly connected with the outlet 11 of the low-temperature sintering box. This is not limited here and can be selected according to actual conditions.

[0048] Alternatively, if Figure 1 , Figure 3 and Figure 4 As shown, the low temperature sintering box 1 and the secondary sintering box 2 are connected by a heat insulating member 4, which is movably arranged relative to the conveyor belt assembly in the vertical direction. The heat insulating member 4 is used to adjust the size of the communication port between the low temperature sintering box 1 and the secondary sintering box 2.

[0049] Therefore, the size of the connecting port between the low-temperature sintering box 1 and the secondary sintering box 2 can be adjusted through the insulation 4 to adjust the heat transferred from the low-temperature sintering box 1 to the secondary sintering box 2, so that the initial temperature of the secondary sintering box 2 can be adjusted as needed, which facilitates the secondary sintering of different battery cells 20.

[0050] The material of the heat insulating member 4 may be any one of foam, aerogel felt, high silica wool, etc., which is not limited here.

[0051] In addition, the heat insulating member 4 is movably arranged relative to the conveyor belt assembly along the vertical direction. The heat insulating member 4 can be rotatable relative to the conveyor belt assembly, or the heat insulating member 4 can be slidable relative to the conveyor belt assembly, which is not limited here.

[0052] Optionally, when the thermal insulation member 4 is slidingly arranged relative to the conveyor belt assembly, the thermal insulation member 4 is slidably connected to the secondary sintering box 2 in the vertical direction, and the battery cell sintering equipment 10 also includes a driving member, the driving end of which is connected to the thermal insulation member 4, and is used to drive the thermal insulation member 4 to move closer to or away from the conveyor belt assembly in the vertical direction.

[0053] Therefore, the heat insulating member 4 can be driven by the driving member to move toward or away from the conveyor belt assembly in the vertical direction, so as to adjust the connecting port between the low-temperature sintering box 1 and the secondary sintering box 2, and the adjustment of the connecting port is simple and convenient.

[0054] Among them, the heat insulation member 4 is slidably connected with the secondary sintering box 2 in the vertical direction. The secondary sintering box 2 may be provided with a slide groove extending in the vertical direction, and the heat insulation member 4 is provided with a slider, which can be slidably embedded in the slide groove, and the structure is simple and easy to implement; or, the secondary sintering box 2 may be provided with a slide rail extending in the vertical direction, and the heat insulation member 4 may be provided with a slide groove extending in the vertical direction, and the slide rail is slidably connected with the slide groove, so that the heat insulation member 4 can be slidably connected with the secondary sintering box 2 in the vertical direction; or, a slide groove extending in the vertical direction is provided on the secondary sintering box 2, and a ball is provided on the heat insulation member 4, and the ball is slidably embedded in the slide groove, so that the sliding between the heat insulation member 4 and the secondary sintering box 2 can be smoother; of course, the heat insulation member 4 can be slidably connected with the secondary sintering box 2 in the vertical direction in other ways, which are not limited here.

[0055] In addition, the driving member can be any one of a pneumatic cylinder, an electric cylinder, a combination of a motor and a screw nut, etc., and is not limited here.

[0056] In some embodiments, Figure 5 As shown, a heating element 14 is provided in the low-temperature sintering box 1, and the heating element 14 is used to perform low-temperature sintering on the battery cell 20 to be sintered; a laser light emitter 24 is provided in the secondary sintering box 2, and the laser light emitter 24 is used to perform secondary sintering on the battery cell 20 that has completed low-temperature sintering.

[0057] Thus, the battery cell 20 in the low temperature sintering box 1 can be subjected to low temperature sintering by the heating element 14, and the battery cell 20 that has completed low temperature sintering can be laser processed by the laser light emitter 24, so that the low temperature sintering and secondary sintering of the battery cell 20 are easy to operate, thereby reducing costs.

[0058] The heating element 14 may be any one of a heating lamp, a resistance wire, a heating belt, etc., which is not limited here.

[0059] In addition, the low-temperature sintering box 1 may include a first cover 12 and a first box bottom 13, the first cover 12 and the first box bottom 13 are arranged to form a low-temperature sintering chamber, and the conveyor assembly may be connected to the first box bottom 13, so that the first box bottom 13 can play a certain supporting role for the conveyor assembly. In addition, the materials of the first cover 12 and the first box bottom 13 can both be heat-insulating materials to reduce the heat loss in the low-temperature sintering chamber, effectively improving the utilization rate of the heat generated by the heating element 14.

[0060] The secondary sintering box 2 may include a second cover 22 and a second box bottom 23. The second cover 22 and the second box bottom 23 are arranged to form a secondary sintering chamber. The conveyor assembly may be connected to the second box bottom 23 so that the second box bottom 23 can play a certain supporting role for the conveyor assembly. In addition, the second cover 22 and the second box bottom 23 may be made of heat-insulating materials to reduce heat loss in the secondary sintering chamber, so that the temperature in the secondary sintering chamber can be slightly higher, thereby effectively extending the annealing time of the secondary sintering, making the silver particles larger, and further improving the conductive performance of the battery cell 20. The second box bottom 23 and the first box bottom 13 can be integrally formed, and the structure is simple and easy to implement, which reduces the difficulty of making the low-temperature sintering box 1 and the secondary sintering box 2.

[0061] Alternatively, if Figure 5 As shown, an inert gas emitter 25 is further provided in the secondary sintering box 2. The inert gas emitter 25 is arranged relative to the laser emitter 24 and close to the inlet 21 of the secondary sintering box.

[0062] As a result, the gas in the secondary sintering box 2 can have a lower heat transfer coefficient, reducing the cooling rate of the battery cell 20, thereby effectively extending the annealing time of the secondary sintering, making the silver particles larger, and thus enabling the battery cell 20 to obtain better conductive properties.

[0063] The inert gas emitted by the inert gas emitter 25 may be at least one of argon, krypton, and xenon, etc., and is not limited here, as long as the thermal conductivity of the gas in the secondary sintering chamber can be lower.

[0064] like Figure 6As shown, the above-mentioned conveyor belt assembly includes a first conveyor belt 31 and a second conveyor belt 32 arranged along a first direction. The first conveyor belt 31 is used to convey the battery cells 20 to be sintered to the low-temperature sintering box 1, and the second conveyor belt 32 is used to convey the battery cells 20 that have completed low-temperature sintering and are conveyed from the first conveyor belt 31 to the secondary sintering box 2.

[0065] Thus, the battery cell 20 to be sintered can be conveyed to the low-temperature sintering box 1 through the first conveyor belt 31, and the battery cell 20 that has completed low-temperature sintering can be conveyed to the secondary sintering box 2 through the second conveyor belt 32, so that the conveying speed of the battery cell 20 in the low-temperature sintering box 1 can be adjusted by the first conveyor belt 31, and the conveying speed in the secondary sintering box 2 can be adjusted by the second conveyor belt 32, which facilitates the control of the low-temperature sintering time and the secondary sintering time of the battery cell 20, and is beneficial to improving the conductive performance of the battery cell 20.

[0066] Among them, the first conveyor belt 31 may include a bracket, a motor, a driving wheel, a conveyor belt and multiple rollers, etc. The motor and the driving wheel can be arranged on the bracket, the driving end of the motor is connected to the driving wheel, the conveyor belt is sleeved on the driving wheel and multiple rollers, and the multiple rollers can be connected to the low-temperature sintering box 1 and the secondary sintering box 2. The structure of the first conveyor belt 31 can be relatively simple and easy to implement.

[0067] In addition, the first conveyor belt 31 may also include a feed plate connected between the bracket and the low-temperature sintering box 1 and a limit plate arranged at both ends of the roller. The limit plate can be detachably connected to the roller, and is fixedly connected to the first box bottom 13 and is perpendicular to the plane where the first box bottom 13 is located, so as to start a certain guiding effect on the conveyor belt; a fixed plate may also be arranged between the feed plate and the bracket, and between the feed and the first box bottom 13 of the low-temperature sintering box 1, so that the connection between the feed plate and the bracket, and between the feed plate and the first box bottom 13 can be relatively firm.

[0068] The structure of the second conveyor belt 32 may be substantially the same as that of the first conveyor belt 31 , and details may be referred to above, which will not be described again.

[0069] Alternatively, if Figure 6 As shown, there is a gap 33 between the first conveyor belt 31 and the second conveyor belt 32 , and along the first direction, the size of the gap 33 is smaller than half of the length of the battery cell 20 .

[0070] Therefore, the transmission between the first conveyor belt 31 and the second conveyor belt 32 can be independent of each other without affecting each other, and the battery cell 20 that has completed low-temperature sintering can be smoothly transmitted to the second conveyor belt 32.

[0071] It should be explained that the above-mentioned interval 33 between the first conveyor belt 31 and the second conveyor belt 32 along the first direction being less than half the length of the battery cell 20 means that when the battery cell 20 is conveyed from the first conveyor belt 31 to contact with the second conveyor belt 32, the center of gravity of the battery cell 20 is still located on the first conveyor belt 31, and when the center of gravity of the battery cell 20 is transferred to the second conveyor belt 32, part of the battery cell 20 is still located on the first conveyor belt 31.

[0072] Optionally, the battery cell sintering equipment 10 also includes a control unit (not shown in the figure), which is electrically connected to the second conveyor belt 32, and the control unit is used to control the speed of the second conveyor belt 32 to v1 when the battery cell 20 is sintered by the laser light emitter 24 in the secondary sintering box 2, and control the speed of the second conveyor belt 32 to v2 after the sintering of the laser light emitter 24 is completed, v1>v2.

[0073] In this way, it can effectively prevent the laser light emitter 24 from heating the battery cell 20 for a long time and causing damage to the lattice on the battery cell 20. At the same time, it can also enable the battery cell 20 to be kept warm for a longer time in the secondary sintering box 2 after sintering by the laser light emitter 24, thereby extending the annealing time of the secondary sintering of the battery cell 20, thereby further obtaining silver dendrites with larger particles, so that the battery cell 20 can obtain better conductive properties.

[0074] It should be understood that when the battery cell 20 passes through the secondary sintering box 2 via the second conveyor belt 32 , the speed is first fast and then slow.

[0075] In addition, the conveying speed of the first conveyor belt 31 can be uniform, and the average speed of the second conveyor belt 32 can be the same as the conveying speed of the first conveyor belt 31, so that the loading speed and unloading speed of the battery cell 20 on the battery cell sintering equipment 10 can be the same, which facilitates the loading and unloading of the battery cell 20.

[0076] Optionally, the thermal conductivity of the second conveyor belt 32 is lower than the thermal conductivity of the first conveyor belt 31 .

[0077] As a result, the heat loss in the secondary sintering box 2 can be reduced, effectively reducing the cooling rate of the battery cell 20 in the secondary sintering box 2, thereby further extending the annealing time of the battery cell 20, allowing the battery cell 20 to obtain silver dendrites with larger particles, thereby further improving the conductivity of the battery cell 20.

[0078] It should be understood that the thermal conductivity of the second conveyor belt 32 is lower than that of the first conveyor belt 31 , and the thermal conductivity of the conveyor belt of the second conveyor belt 32 may be lower than that of the conveyor belt of the first conveyor belt 31 .

[0079] The base material of the conveyor belt of the second conveyor belt 32 may be nylon, Teflon, or heat-resistant rubber, which is not limited here.

[0080] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A battery cell sintering device, characterized in that: include: A low temperature sintering box, which is used to perform low temperature sintering on the battery cells to be sintered; A secondary sintering box, which is located downstream of the low-temperature sintering box and is used to perform secondary sintering on the battery cell that has completed low-temperature sintering; A conveyor belt assembly, wherein the conveyor belt assembly passes through the low-temperature sintering box and the secondary sintering box in sequence, and the conveyor belt assembly is used to convey the battery cells to be sintered to the low-temperature sintering box and the secondary sintering box in sequence along a first direction.

2. The cell sintering equipment according to claim 1, characterized in that: Along the first direction, the low-temperature sintering box and the secondary sintering box are disposed adjacent to each other, and an outlet of the low-temperature sintering box is communicated with an inlet of the secondary sintering box.

3. The cell sintering equipment according to claim 2, characterized in that: The low temperature sintering box and the secondary sintering box are connected via a heat insulating member, which is movably arranged relative to the conveyor belt assembly in a vertical direction and is used to adjust the size of the communication port between the low temperature sintering box and the secondary sintering box.

4. The cell sintering equipment according to claim 3, characterized in that: The thermal insulation member is slidably connected to the secondary sintering box along the vertical direction. The battery cell sintering equipment also includes a driving member, a driving end of which is connected to the thermal insulation member, and is used to drive the thermal insulation member to move closer to or away from the conveyor belt assembly along the vertical direction.

5. The cell sintering equipment according to claim 1, characterized in that: The low-temperature sintering box is provided with a heating element, and the heating element is used to perform low-temperature sintering on the battery cells to be sintered; A laser light emitter is arranged in the secondary sintering box, and the laser light emitter is used to perform secondary sintering on the battery cell that has completed low-temperature sintering.

6. The cell sintering equipment according to claim 5, characterized in that: An inert gas emitter is also arranged in the secondary sintering box. The inert gas emitter is arranged relative to the laser emitter and close to the inlet of the secondary sintering box.

7. The cell sintering equipment according to any one of claims 1 to 6, characterized in that: The conveyor belt assembly includes a first conveyor belt and a second conveyor belt arranged along the first direction, the first conveyor belt is used to convey the battery cells to be sintered into the low-temperature sintering box, and the second conveyor belt is used to convey the battery cells that have completed low-temperature sintering and are conveyed from the first conveyor belt into the secondary sintering box.

8. The cell sintering equipment according to claim 7, characterized in that: There is a gap between the first conveyor belt and the second conveyor belt, and along the first direction, a size of the gap is smaller than half of the length of the battery sheet.

9. The cell sintering equipment according to claim 7, characterized in that: The battery cell sintering equipment also includes a control unit, which is electrically connected to the second conveyor belt, and the control unit is used to control the speed of the second conveyor belt to v1 when the battery cell is sintered by the laser light emitter in the secondary sintering box, and control the speed of the second conveyor belt to v2 after the sintering of the laser light emitter is completed, v1>v2.

10. The cell sintering equipment according to claim 7, characterized in that: The thermal conductivity of the second conveyor belt is lower than the thermal conductivity of the first conveyor belt.

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