CN119457381A - A BC battery string welding method and device - Google Patents
A BC battery string welding method and device Download PDFInfo
- Publication number
- CN119457381A CN119457381A CN202510064477.4A CN202510064477A CN119457381A CN 119457381 A CN119457381 A CN 119457381A CN 202510064477 A CN202510064477 A CN 202510064477A CN 119457381 A CN119457381 A CN 119457381A
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- Prior art keywords
- battery
- battery cell
- heat source
- welding
- strip
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000003466 welding Methods 0.000 title claims abstract description 167
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000010438 heat treatment Methods 0.000 claims abstract description 35
- 229910000679 solder Inorganic materials 0.000 claims description 98
- 239000003795 chemical substances by application Substances 0.000 claims description 31
- 230000017525 heat dissipation Effects 0.000 claims description 8
- 238000001179 sorption measurement Methods 0.000 claims description 6
- 239000011810 insulating material Substances 0.000 claims description 2
- 238000005476 soldering Methods 0.000 claims 20
- 239000003292 glue Substances 0.000 claims 2
- 238000007711 solidification Methods 0.000 abstract description 4
- 230000008023 solidification Effects 0.000 abstract description 4
- 238000005452 bending Methods 0.000 description 7
- 239000002313 adhesive film Substances 0.000 description 6
- 239000000853 adhesive Substances 0.000 description 5
- 230000001070 adhesive effect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000001360 synchronised effect Effects 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 239000012774 insulation material Substances 0.000 description 2
- 229920001296 polysiloxane Polymers 0.000 description 2
- 230000000452 restraining effect Effects 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/02—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating by means of a press ; Diffusion bonding
- B23K20/023—Thermo-compression bonding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/26—Auxiliary equipment
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Battery Mounting, Suspending (AREA)
Abstract
The invention discloses a BC battery string welding method and device, which comprises the following steps of presetting a welding strip fixing agent on a battery piece, heating the battery piece to enable the welding strip fixing agent on the battery piece to be melted, enabling the heated battery piece to be in quick contact with the welding strip, fixing the welding strip on the battery piece through solidification of the welding strip fixing agent to finish welding or fixing between the battery piece and the welding strip, enabling the temperature of the welding strip to be lower than that of the battery piece through normal temperature or independent heating, and enabling the battery piece to be independently heated to be melted and then to be in contact with the welding strip to achieve welding or fixing.
Description
Technical Field
The invention relates to the technical field of battery pieces, in particular to a BC battery string welding method and device.
Background
BC (Back Contact) battery pieces, namely back contact battery pieces, are technology of arranging positive and negative metal contacts on the back of the battery pieces.
When BC battery piece and welding area are in series welding, the welding area is located the battery piece back. In the prior art, after the battery piece and the welding strip are pressed together, the welding strip and the battery piece are connected together by heating and welding. Since the solder strip substrate is typically copper, the battery cell substrate is typically silicon, the coefficient of thermal expansion of copper is much greater than that of silicon, and the shrinkage of the solder strip after cooling is greater than that of the battery cell, resulting in the solder strip pulling the battery cell to bend.
Disclosure of Invention
In order to solve the problems, the invention provides the BC battery string welding method and the BC battery string welding device with reasonable structure, thereby effectively reducing or even avoiding the bending of the battery piece and greatly ensuring the overall quality and effect of the welded battery piece and the welding strip.
The technical scheme adopted by the invention is as follows:
A BC battery string welding method comprising the steps of:
Heating a battery piece preset with a welding strip fixing agent to enable the welding strip fixing agent on the battery piece to be melted;
and the heated battery piece is in quick contact with the welding strip, the welding strip is fixed on the battery piece through the solidification of the welding strip fixing agent, and the welding or fixing between the battery piece and the welding strip is completed, wherein the welding strip is heated at normal temperature or independently, and the temperature of the welding strip is lower than that of the battery piece.
As a further improvement of the above technical scheme:
Independently heating the battery piece by adopting a heat source;
And after the heated battery piece is contacted with the welding strip for a preset time, the heat source is separated from the battery piece or is closed.
The welding strip and the battery piece are respectively heated by a heat source;
after heating, the battery piece and the welding strip are respectively contacted with a heat source or one of the battery piece and the welding strip is contacted with the heat source, closing the heat source or leaving the heat source after contacting for a preset time; or the battery piece and the welding strip are contacted with each other after being separated from the heat source respectively after being heated, and are welded or solidified.
After the battery piece is heated by the heat source, the battery piece is driven by driving power to move towards the welding strip to contact, and meanwhile, the heated battery piece is separated from the heat source.
After the battery piece is heated by the heat source, the heat source is closed, and the welding strip is driven by driving power to move towards the battery piece and contact, or the battery piece is driven by driving power to move towards the welding strip and contact.
The battery piece is heated by the heat source, the welding strip is driven by driving power to move towards the battery piece and contact, or the heat source is driven by driving power to move towards the welding strip along with the battery piece and contact, and after the battery piece is contacted for a preset time, the heat source is separated from the battery piece or the heat source is closed.
The heat source comprises one or more than two of heating rods, infrared lamps, LED lamps and electromagnetic heating.
The battery piece is positioned above the welding strip, the welding strip fixing agent is pre-arranged on the bottom surface of the battery piece, the battery piece is clamped or adsorbed on the battery piece platform above, and the welding strip is restrained and supported on the welding strip platform below.
The constraint supporting mode of the welding strip platform for the welding strip comprises an active constraint supporting mode or a passive constraint supporting mode, wherein the active constraint supporting mode comprises one of adsorption and clamping, and the passive constraint supporting mode comprises adhesion caused by friction between the welding strip and the surface of the welding strip platform.
The battery piece is positioned below the welding strip, a welding strip fixing agent is pre-arranged on the top surface of the battery piece, the battery piece is clamped or adsorbed on a lower battery piece platform, and the welding strip is clamped or adsorbed on an upper welding strip platform.
The welding strip platform is provided with a heat dissipation platform on the surface facing away from the welding strip, or a heat dissipation system is arranged in the welding strip platform.
And a heat insulation material is laid on one side of the welding strip, which is away from the battery piece.
The welding strip fixing agent is one or more than two of solder paste, conductive adhesive and conductive adhesive film.
A BC battery string welding device comprises a heat source, a welding strip platform and a battery piece platform, wherein the heat source is used for independently heating battery pieces on the battery piece platform to enable welding strip fixing agents on the battery pieces to be melted, the welding strip platform is used for restraining and supporting the welding strips, and the BC battery string welding device further comprises driving power which is used for enabling the heated battery pieces to rapidly move towards the welding strips and contact with the welding strips or enabling the welding strips to rapidly move towards the heated battery pieces and contact with the welding strips or enabling the welding strips to simultaneously and rapidly move towards each other to enable the welding strips and the heated battery pieces to contact with each other.
As a further improvement of the above technical scheme:
the battery piece and the welding strip are respectively heated by a heat source.
Compared with the prior art, the invention has the following beneficial effects:
According to the invention, the battery piece is independently heated until the welding strip fixing agent is melted and then is contacted with the welding strip to realize welding or fixing, so that the mode of synchronous heating after the existing battery piece and the welding strip are pressed is replaced, the problem of bending of the battery piece caused by different shrinkage due to the difference of the thermal expansion coefficients of the base materials in the synchronous heating mode is solved, the bending of the battery piece is effectively reduced or even avoided, and the integral quality and effect of the battery piece and the welding strip after welding are greatly ensured.
The invention also has the following advantages:
The battery piece is independently heated by the heat source, and then the heated battery piece is independently contacted with the welding strip, or the heat source is contacted with the welding strip along with the battery piece synchronously for a preset time, so that the hysteresis quality of heat conduction is ingeniously utilized, and the temperature of the welding strip is smaller than that of the battery piece in the process of being contacted with the welding strip, so that a temperature difference exists between the battery piece and the welding strip, that is, the battery piece and the welding strip are heated differently, and the bending of the battery piece caused by different shrinkage due to different thermal expansion coefficients is compensated.
Drawings
Fig. 1 is a schematic view of a state in which a battery sheet is located under a solder strip according to the present invention.
Fig. 2 is a schematic view showing a state in which a battery sheet is positioned above a solder strip according to the present invention.
The device comprises 10 parts of welding strip platform, 20 parts of welding strip, 30 parts of battery piece, 40 parts of battery piece platform, and 50 parts of heat source.
Detailed Description
The following describes specific embodiments of the present invention with reference to the drawings.
The BC battery string welding method of the embodiment comprises the following steps:
The first step is to heat the battery piece 30 pre-provided with the welding strip fixing agent to melt the welding strip fixing agent on the battery piece 30;
And the second step is to quickly contact the heated battery piece 30 with the welding strip 20, fix the welding strip 20 on the battery piece 30 through the solidification of the welding strip fixing agent, and finish the welding or fixing between the battery piece 30 and the welding strip 20, wherein the welding strip 20 is heated at normal temperature or independently, and the temperature of the welding strip 20 is lower than that of the battery piece 30.
In this embodiment, the mode of separately heating the battery piece 30 until the solder strip fixing agent is melted and then contacting with the solder strip 20 to realize welding or fixing replaces the existing mode of synchronous heating after the battery piece and the solder strip are pressed together, so as to solve the problem of bending of the battery piece caused by different shrinkage due to the difference of thermal expansion coefficients of the base materials in the synchronous heating mode.
In this embodiment, the battery piece 30 is heated separately and then is in rapid contact with the solder strip 20 to achieve fixing or welding, and in the whole process, the temperature of the solder strip 20 is lower than that of the battery piece 30, so that the shrinkage difference between the solder strip 20 and the battery piece 30 due to the thermal expansion coefficient is effectively reduced.
In this embodiment, when the solder ribbon 20 is at room temperature, the battery sheet 30 is heated alone until the solder ribbon fixing agent is melted, and then brought into rapid contact with the solder ribbon 20 in a room temperature state, and the solder ribbon 20 is fixed to the battery sheet 30 by curing the solder ribbon fixing agent.
In practical use, the solder strip 20 at normal temperature can be reliably fixed with the battery piece 30 which is independently heated.
In this embodiment, the solder strip 20 can be heated independently according to practical requirements, so as to meet different process requirements, such as heating the solder strip 20 to slow down the curing speed after contacting the heated battery piece 30, so as to improve the curing quality of the battery piece 30 and the solder strip 20. Of course, considering the difference in thermal expansion coefficient between the solder ribbon 20 and the battery piece 30, when the solder ribbon 20 is heated, the heating temperature of the solder ribbon 20 needs to be lower than the heating temperature of the battery piece 30.
The heat source 50 is adopted to heat the battery piece 30 independently, after the battery piece 30 is heated, the heat source 50 is separated from the battery piece 30 or the heat source is closed, so that the heat source 50 only acts on the battery piece 30, and the effect on the welding belt 20 is reduced or even avoided.
In one embodiment, after the battery piece 30 is heated by the heat source 50, the battery piece 30 is driven by driving power to move towards the welding strip 20 to contact, and meanwhile, the heated battery piece 30 is separated from the heat source 50, so that the battery piece 30 is independently heated by the heat source 50.
In another embodiment, after the battery piece 30 is heated by the heat source 50, the heat source 50 is turned off, the solder strip 20 is driven by the driving power to move towards the battery piece 30 for contact, or the battery piece 30 is driven by the driving power to move towards the solder strip 20 for contact, so that the battery piece 30 is independently heated by the heat source 50.
In another embodiment, after the battery sheet 30 is heated by the heat source 50, the heat source 50 is contacted with the solder ribbon 20 for a preset time along with the battery sheet 30, and then the heat source 50 is separated from the battery sheet 30 or the heat source 50 is turned off.
In this embodiment, the heat source 50 contacts the solder ribbon 20 with the battery tab 30, thereby maintaining the temperature of the solder ribbon fixing agent and assisting the reliable fixing with the solder ribbon 20.
Of course, in actual operation, the preset time is closely related to factors such as materials, heating temperature of the heat source 50, and the like, and the preset time can be determined according to actual experiments and actual requirements.
In this embodiment, the heat source 50 contacts with the solder strip 20 along with the battery piece 30, the battery piece 30 and the heat source 50 are driven to move towards the solder strip 20 by driving power, the solder strip 20 is driven to move towards the battery piece 30 and the heat source 50 by driving power, and the battery piece 30, the heat source 50 and the solder strip 20 are driven to move in opposite directions by driving power respectively, so that the contact between the solder strip 20 and the battery piece 30 is realized.
In this embodiment, after the heat source 50 contacts the solder strip 20 for a preset time along with the battery piece 30, the heat source 50 may be driven by external driving power to separate from the battery piece 30, or the heat source 50 may be turned off.
Of course, in actual operation, in addition to the use of the heat source 50 to heat the battery piece 30 alone, the solder ribbon 20 and the battery piece 30 may be heated by the heat source 50, respectively, so that the heating temperature of the solder ribbon 20 is lower than the temperature of the battery piece 30.
In one embodiment, after the solder ribbon 20 and the battery sheet 30 are heated respectively, the battery sheet 30 and the solder ribbon 20 are contacted with the heat source 50 or one of them is contacted with the heat source 50 respectively, and the heat source 50 is turned off or the heat source 50 is separated after a preset time.
In another embodiment, after the solder strip 20 and the battery piece 30 are heated, the battery piece 30 and the solder strip 20 are separated from the heat source 50, and then contact each other for welding or curing.
The heat source 50 includes, but is not limited to, one or more of a heating rod, an infrared lamp, an LED lamp, and electromagnetic heating, and can be used for realizing the separate rapid heating of the battery plate 30 or the welding strip 20.
In the embodiment shown in fig. 1, the battery piece 30 is located below the solder strip 20, the solder strip fixing agent is pre-arranged on the top surface of the battery piece 30, the battery piece 30 is clamped or adsorbed on the lower battery piece platform 40, and the solder strip 20 is clamped or adsorbed on the upper solder strip platform 10.
In this embodiment, the battery plate platform 40 may be provided with a negative pressure hole communicated with an external air source to realize the adsorption and fixation of the battery plate 30, or of course, a clamping member may be provided on the battery plate platform 40 to clamp and fix the battery plate 30, or a heating rod, an infrared lamp, an LED lamp, an electromagnetic heat source 50 may be provided inside the battery plate platform 40 to realize the independent rapid heating of the battery plate 30.
In this embodiment, the welding strip platform 10 may be provided with a negative pressure hole communicated with an external air source to fix the welding strip 20 by adsorption, or a clamping member may be provided on the welding strip platform 10 to clamp the welding strip 20 by the clamping member to fix.
In actual use, after the heat source 50 heats the battery piece 30 on the battery piece platform 40, the heat source 50 is turned off, so that the battery piece 30 can be driven by external driving power to quickly contact with the solder strip 20 on the bottom surface of the upper solder strip platform 10 along with the upward movement of the battery piece platform 40, or the solder strip 20 can be driven by external driving power to quickly contact with the battery piece 30 on the top surface of the lower battery piece platform 40 along with the downward movement of the solder strip platform 10, and the fixing and welding of the solder strip 20 on the battery piece 30 can be realized by the solder strip curing agent.
In the embodiment shown in fig. 2, the battery piece 30 is located above the solder strip 20, the bottom surface of the battery piece 30 is pre-provided with solder strip fixing agent, the battery piece 30 is clamped or absorbed on the upper battery piece platform 40, and the solder strip 20 is restrained and supported on the lower solder strip platform 10.
In this embodiment, the battery plate platform 40 may be provided with a negative pressure hole communicated with an external air source to realize the adsorption and fixation of the bottom surface to the battery plate 30, or of course, a clamping member may be provided on the battery plate platform 40 to clamp and fix the battery plate 30, or a heating rod, an infrared lamp, an LED lamp, an electromagnetic heat source 50 may be provided inside the battery plate platform 40 to realize the independent rapid heating of the battery plate 30.
In actual use, after the battery piece 30 on the battery piece platform 40 is heated by the heat source 50, the heat source 50 is turned off, so that the battery piece 30 can be driven by external driving power to quickly contact with the solder strip 20 on the top surface of the lower solder strip platform 10 along with the descending of the battery piece platform 40, or the solder strip 20 can be driven by external driving power to quickly contact with the battery piece 30 on the bottom surface of the upper battery piece platform 40 along with the ascending of the solder strip platform 10, and the fixing and welding of the solder strip 20 on the battery piece 30 can be realized by the solder strip curing agent.
In this embodiment, the constraining support of the solder ribbon platform 10 to the solder ribbon 20 includes an active constraining support including, but not limited to, one of suction and clamping, or a passive constraining support including a viscous state caused by friction between the solder ribbon 20 and the surface of the solder ribbon platform 10.
In one embodiment, the solder strip platform 10 may be provided with a negative pressure hole communicated with an external air source to achieve adsorption fixation of the solder strips 20, or clamping members may be provided on the solder strip platform 10, for example, two ends of each solder strip 20 are symmetrically provided with a pair of clamping members, and each solder strip 20 is clamped by the clamping members to achieve fixation.
In another embodiment, the surface of the solder ribbon platform 10 supporting the solder ribbon 20 is configured as a soft silicone plate, and the solder ribbon 20 placed on the soft silicone plate sticks under friction, similar to the solder ribbon 20 being fixed to the solder ribbon platform 10.
The surface of the welding strip platform 10, which is away from the welding strip 20, is provided with a heat dissipation platform, or a heat dissipation system is arranged in the welding strip platform 10, so that the solidification speed of the welding strip solidifying agent can be increased through heat dissipation when the process is required.
In one embodiment, the side of the solder strip 20 facing away from the battery cells is coated with a thermally insulating material. By laying the heat insulation material, heat dissipation is slowed down and reduced.
The solder strip fixing agent is one or more than two of solder paste, conductive adhesive and conductive adhesive film.
In this embodiment, the solder paste is printed on the battery piece 30 in advance, and the solder paste on the battery piece 30 melts as the battery piece 30 is heated, and after the solder strip 20 contacts the battery piece 30, the solder paste cools and solidifies to fix the battery piece 30 and the solder strip 20 together to form a solder joint.
In this embodiment, the conductive adhesive and the conductive adhesive film are pre-coated on the battery piece 30, and the conductive adhesive film trigger the reaction on the battery piece 30 along with the heating of the battery piece 30, and after the solder strip 20 contacts with the battery piece 30, the conductive adhesive and the conductive adhesive film are cured to fix the battery piece 30 and the solder strip 20, and an electrical path is formed between the battery piece 30 and the solder strip 20 by the conductive adhesive and the conductive adhesive film.
The embodiment also provides a BC battery string welding device, which comprises a heat source 50, a welding strip platform 10 and a battery piece platform 40, wherein the heat source 50 is used for independently heating the battery pieces 30 on the battery piece platform 40 to enable welding strip fixing agents on the battery pieces 30 to be melted, the welding strip platform 10 is used for restraining and supporting the welding strips 20, and the BC battery string welding device further comprises driving power which is used for enabling the heated battery pieces 30 to rapidly move towards the welding strips 20 and contact with the welding strips, or driving power which is used for enabling the welding strips 20 to rapidly move towards the heated battery pieces 30 and contact with the welding strips, or driving power which is used for enabling the welding strips 20 and the heated battery pieces 30 to simultaneously and rapidly move towards each other to contact with each other.
In one embodiment, the battery plate 30 and the solder strip 20 are heated by the heat source 50, that is, the solder strip 20 can be heated independently according to the actual process requirement, and the heating temperature of the solder strip 20 is lower than that of the battery plate 30, so as to reduce the difference in shrinkage between the solder strip 20 and the battery plate 30 caused by the thermal expansion coefficient.
In the BC battery string welding apparatus of this embodiment, the BC battery string welding method is adopted, by heating the battery piece 30 alone, the solder strip fixing agent on the battery piece 30 is melted or thawed, and the quick contact between the battery piece 30 and the solder strip 20 is combined, so that the fixing and welding between the battery piece 30 and the solder strip 20 are realized through the solder strip fixing agent, and the bending phenomenon caused by the shrinkage difference caused by the thermal expansion coefficient of the material between the battery piece 30 and the solder strip 20 is effectively reduced or even avoided.
The invention effectively reduces or even avoids the bending of the battery piece, and greatly ensures the integral quality and effect of the welded battery piece and the welding strip.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The above description is intended to illustrate the invention and not to limit it, the scope of which is defined by the claims, and any modifications can be made within the scope of the invention.
Claims (15)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202510064477.4A CN119457381A (en) | 2025-01-15 | 2025-01-15 | A BC battery string welding method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202510064477.4A CN119457381A (en) | 2025-01-15 | 2025-01-15 | A BC battery string welding method and device |
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| Publication Number | Publication Date |
|---|---|
| CN119457381A true CN119457381A (en) | 2025-02-18 |
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| CN202510064477.4A Pending CN119457381A (en) | 2025-01-15 | 2025-01-15 | A BC battery string welding method and device |
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| CN119186960A (en) * | 2024-08-30 | 2024-12-27 | 杭州弘晟智能科技有限公司 | Gluing process, gluing equipment and battery piece processing process |
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