CN120583783A - Attaching method and system of flexible assembly battery piece and protective layer - Google Patents
Attaching method and system of flexible assembly battery piece and protective layerInfo
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- CN120583783A CN120583783A CN202511086486.XA CN202511086486A CN120583783A CN 120583783 A CN120583783 A CN 120583783A CN 202511086486 A CN202511086486 A CN 202511086486A CN 120583783 A CN120583783 A CN 120583783A
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- protective layer
- adhesive
- cutting
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- battery piece
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Abstract
The invention discloses a method and a system for attaching a battery piece and a protective layer of a flexible assembly, and belongs to the technical field of flexible batteries. The bonding method comprises the steps of pre-cutting the surface of the battery piece to form a first pre-cutting line, bonding the battery piece and the protective layer through adhesive glue, then curing the adhesive glue, pre-cutting the surface of the protective layer through aligning the first pre-cutting line to form a second pre-cutting line, wherein the viscosity of the adhesive glue before curing is 500-1500 mPa.s, and the light transmittance of the adhesive glue is more than or equal to 95%. According to the invention, the protective layer is pre-cut through the aligned first pre-cutting line, so that the precise alignment of the protective layer and the pre-cutting line of the battery piece is ensured, and the precision and the product quality of the subsequent splitting process are improved. The adhesive used in the matched and optimized post-lamination process has lower requirements on fluidity and adhesiveness and higher light transmittance, and is beneficial to improving the conversion efficiency of the battery.
Description
Technical Field
The invention belongs to the technical field of flexible batteries, and particularly relates to a method and a system for attaching a flexible assembly battery piece and a protective layer.
Background
In the existing manufacturing process of the flexible component, pre-cutting is usually performed on the battery piece and the protective layer in advance to form a pre-cutting line, and then double-sided pre-cutting line alignment and lamination are realized through a CCD alignment technology. However, there are some points to be improved on this process.
First, if the protective layer has been precut before bonding, the protective layer is extremely prone to cracking in advance during movement or handling, resulting in wastage of raw materials.
Secondly, the battery piece and the protective layer are pre-cut in advance, which makes the attaching process extremely high in requirement. In the lamination process, a CCD alignment technique is required to align the pre-cut lines of the battery cells and the protective layer. However, even with this method, the overlap deviation of the protective layer and the pre-cut line of the battery sheet is still large, thereby affecting the performance and quality of the battery.
Thirdly, in the prior art, after the battery piece and the protective layer are bonded by the adhesive, alignment adjustment is needed to enable the pre-cutting lines of the battery piece and the protective layer to be overlapped and then solidified, and the fluidity and the viscosity of the adhesive are required to be balanced, so that the physical property and the optical property of the adhesive are limited, and the conversion efficiency of the battery is further affected.
It should be noted that this section of the disclosure only provides a background related to the present disclosure, and does not necessarily constitute prior art or known technology.
Disclosure of Invention
The invention aims to at least solve the problems of large overlapping deviation of the pre-cutting line on the protective layer and the pre-cutting line of the battery piece and poor adhesive property in the prior art. The invention provides a bonding method and a bonding system for a battery piece and a protective layer of a flexible component. Meanwhile, the adhesive used in the post-lamination process is matched and optimized, so that the conversion efficiency of the battery is improved.
In order to achieve the aim, in a first aspect, the invention provides a laminating method of a battery piece and a protective layer of a flexible component, which comprises the following steps of pre-cutting the surface of the battery piece to form a first pre-cutting line, curing the adhesive after laminating the battery piece and the protective layer through the adhesive, and pre-cutting the surface of the protective layer through the first pre-cutting line to form a second pre-cutting line, wherein the viscosity of the adhesive before curing is 500-1500 mPa.s, and the light transmittance of the adhesive is more than or equal to 95%.
Further, the adhesive glue is one or a combination of silica gel, EVA glue, POE glue and double-sided glue.
Further, the adhesive comprises, by mass, 60-80% of vinyl silicone oil, 10-25% of a cross-linking agent, 5-10% of a platinum catalyst, 1-5% of a filler and 1-3% of a tackifier.
Further, the phenyl vinyl silicone oil content in the vinyl silicone oil is 20-50%.
Further, the cross-linking agent is selected from one or a combination of hydrogen-containing silicone oil and methyl vinyl MQ silicone resin.
Further, the platinum catalyst is selected from one or a combination of vinyl siloxane platinum complex and chloroplatinic acid catalyst.
Further, the filler is selected from one or a combination of silica aerogel and modified silica aerogel.
Further, the tackifier is an alpha, omega-dihydroxypolysiloxane.
Further, the adhesive has a hardness of 30-55Shore A after curing.
Further, the curing temperature of the adhesive is 60-110 ℃ and the curing time is 30-60 minutes.
Further, the ratio of the first pre-cut line to the thickness of the battery piece is in the range of 1/3-2/3, and the maximum width of the first pre-cut line is in the range of 10 mu m-50 mu m.
Further, the ratio of the second precut line to the thickness of the protective layer is in the range of 1/5-3/5, and the maximum width of the second precut line is in the range of 10 μm-80 μm.
Further, the surface of the protective layer is pre-cut by adopting laser cutting, a laser focus is positioned at a position, away from the upper surface of the battery piece, of the protective layer, which is 1/3-2/3 down, the laser power of the laser cutting is greater than or equal to 50W, the laser wavelength is 532nm, the pulse width is less than 15PS, the single pulse energy is greater than 200uj, the repetition frequency of laser pulses is 20kHz-1MHz, and the cutting speed is 1mm/s-3000mm/s.
Further, after forming the second pre-cut line, further comprising:
Removing the waste edges on the protective layer;
and splitting the protective layer, the adhesive glue and the battery pieces to form a plurality of small battery pieces.
In a second aspect, the invention provides a laminating system of a flexible component battery piece and a protective layer, wherein the laminating system is applied to a laminating method of the flexible component battery piece and the protective layer, and comprises a pre-cutting device, a laminating device and a positioning device; the battery piece is provided with a battery piece surface, a pre-cutting device, a bonding device and an alignment device, wherein the pre-cutting device is used for pre-cutting the surface of the battery piece to form a first pre-cutting line and pre-cutting the surface of the protective layer to form a second pre-cutting line, the bonding device is used for bonding the battery piece and the protective layer through bonding glue and then solidifying the bonding glue, and the alignment device is used for assisting the pre-cutting device to align the first pre-cutting line.
The invention has the beneficial effects that:
According to the technical scheme, the battery piece is pre-cut on the surface of the battery piece to form a first pre-cut line, the battery piece is attached to the protective layer through the adhesive, the adhesive is solidified, the surface of the protective layer is pre-cut on the first pre-cut line to form a second pre-cut line, the viscosity of the adhesive before solidification is 500-1500 mPa.s, and the light transmittance of the adhesive is more than or equal to 95%. The protective layer is pre-cut after being attached, so that the risk of early cracking in the moving or carrying process is avoided, and the reject ratio of products is obviously reduced. According to the invention, the protective layer is pre-cut through the aligned first pre-cutting line, so that the precise alignment of the protective layer and the pre-cutting line of the battery piece is ensured, and the precision and the product quality of the subsequent splitting process are improved.
Furthermore, the invention successfully solves the problem that the mobility and the viscosity of the adhesive are required to be balanced in the prior art by optimizing the process of laminating and solidifying the protective layer and then precutting the protective layer. The invention improves the components of the adhesive to improve the light transmittance and is beneficial to improving the conversion efficiency of the battery.
Further, the deviation of alignment lamination precision in the prior art can only be 20-50 μm at most, the lamination precision is low, the subsequent cracking defective rate is high, and the battery production defective rate is low. By adopting the technical scheme of the invention, the attaching precision deviation can be smaller than 10 mu m, so that the lobe yield is greatly improved.
The laminating system of the flexible assembly battery piece and the protective layer comprises the pre-cutting device, the laminating device and the alignment device, wherein the devices work cooperatively, so that an efficient and stable laminating process is realized, and the production efficiency and the product quality are further improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flow chart of a method for attaching a flexible assembly battery sheet and a protective layer according to embodiment 1 of the present invention;
Fig. 2 is a flow chart of a method for attaching a flexible assembly battery sheet and a protective layer according to comparative example 1 of the present invention.
Detailed Description
In the present invention, unless otherwise indicated, terms of orientation such as "upper, lower, left, right" and the like are used generally to refer to the orientation as shown in the drawings and in practice.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
The endpoints and any values of the ranges disclosed herein are not limited to the precise range or value, and are understood to encompass values approaching those ranges or values. For numerical ranges, one or more new numerical ranges may be found between the endpoints of each range, between the endpoint of each range and the individual point value, and between the individual point value, in combination with each other, and are to be considered as specifically disclosed herein. Wherein the terms "optional" and "optionally" mean either comprising or not comprising (or may not be present).
The invention provides a bonding method of a flexible component battery piece and a protective layer, which comprises the following steps of pre-cutting the surface of the battery piece to form a first pre-cutting line, bonding the battery piece and the protective layer through adhesive glue, solidifying the adhesive glue, pre-cutting the surface of the protective layer through positioning the first pre-cutting line to form a second pre-cutting line, wherein the viscosity of the adhesive glue before solidification is 500-1500 mPa.s, and the light transmittance of the adhesive glue is more than or equal to 95%.
In the prior art, the battery piece and the protective layer are pre-cut in advance, so that the protective layer is easy to crack in advance in the carrying process, and the pre-cutting process of the protective layer is arranged after the lamination, so that the reject ratio of products is reduced. Meanwhile, the pre-cutting line in the prior art has larger alignment deviation, affects the precision of the subsequent splitting process, according to the invention, the pre-cutting of the protective layer is carried out by aligning the first pre-cutting line, so that the accurate alignment of the pre-cutting line is ensured, and the precision and the product quality of the splitting process are improved. In addition, the process of bonding, curing and cutting is optimized, and the fluidity and the viscosity of the adhesive are not required to be balanced as in the prior art, so that the components of the adhesive can be further optimized to improve the light transmittance, and the conversion efficiency of a battery is improved.
The following will explain in detail the principle of the present invention for improving the bonding process:
In the prior art, pre-cutting is usually performed on the battery piece and the protective layer in advance to form a pre-cutting line, and then double-sided pre-cutting line alignment and lamination are realized through a CCD alignment technology.
There are some points to be improved on this process. Firstly, in the prior art, the pre-cutting is performed on the battery piece and the protective layer in advance, the structure of the battery piece is hard, the battery piece is not easy to break before being attached, but the protective layer is a brittle material layer which can be glass, PC, PMMA, PP, PET or a transparent fluorine material layer, the structure is towards brittleness, and the structure is easy to break in advance in the carrying process, and the pre-cutting process of the protective layer is arranged after being attached, so that the risk is avoided, and the reject ratio of products is reduced.
It should be noted that, the purpose of pre-cutting the battery piece and the protective layer to form the pre-cutting line in advance in the prior art is to separate the pre-cutting process from the attaching process area, because the production efficiency is mainly determined by the attaching speed, the pre-cut battery piece and the protective layer are prepared in advance, and the production efficiency can be improved. However, as mentioned above, the adoption of the technology of pre-cutting in advance can lead to larger overlapping deviation of the pre-cutting line on the protective layer and the pre-cutting line of the battery piece, and with the continuous development of the photovoltaic industry, the requirement on the quality of the battery is also higher and higher, and the prior art has higher production efficiency but cannot meet the increasing high requirement on the quality of the battery.
Secondly, the prior art realizes double-sided pre-cutting line alignment and lamination through CCD alignment technology, but because the pre-cutting lines on the battery piece and the protective layer are respectively pre-cut in advance, the pre-cutting lines of the battery piece and the protective layer are not aligned to be cut, a certain error exists in the pre-cutting line alignment technology, meanwhile, the CCD alignment technology also has a certain error when the pre-cutting line is identified, and the two errors are overlapped, so that the overlapping deviation of the final battery piece and the protective layer pre-cutting line can be quite large. The first pre-cutting line is formed on the battery piece in advance, the battery piece is attached to the protective layer, and then the second pre-cutting line is formed on the protective layer by aligning the first pre-cutting line, so that the pre-cutting line of the battery piece and the protective layer is ensured to be accurately aligned, and the precision and the product quality of the follow-up splitting process are improved.
Thirdly, when the battery piece and the protective layer are aligned and attached, it is obvious that the pre-cutting lines on the battery piece and the protective layer are directly aligned by one-time positioning. In practice, when the battery piece and the protective layer are aligned and bonded, adhesive is coated between the battery piece and the protective layer, then the battery piece and the protective layer are laminated, and fine adjustment is performed for a plurality of times to reduce the overlapping deviation of the two pre-cutting lines. However, since the adhesive is already coated between the battery plate and the protective layer, the adhesive must have high fluidity, or the adhesive has too high viscosity to directly adhere the battery plate and the protective layer, and the positions of the battery plate and the protective layer cannot be finely adjusted. On the other hand, if the fluidity of the adhesive is too high, the battery sheet and the protective layer may be displaced again to cause deviation after the fine alignment is completed. In summary, the requirement on the adhesive is very high by adopting the alignment and lamination process in the prior art, and the fluidity and the viscosity of the adhesive need to be balanced at the same time.
Further, although the fluidity, viscosity and transmittance of the adhesive used in the photovoltaic field are not simply linear, the transmittance of the adhesive is obviously reduced by adjusting the components thereof to balance the fluidity and viscosity of the adhesive, and the low transmittance firstly reduces the accuracy of alignment and lamination of the double pre-cut lines in the prior art of CCD alignment technology, and also influences the subsequent light to enter the battery piece through the protective layer and the adhesive, thereby reducing the conversion efficiency of the battery.
Meanwhile, the prior art also has the problems of mutual elbow pulling of the bonding process and the adhesive property. It is first emphasized that when one skilled in the art wants to start from improving the lamination process, it is not conceivable to exchange the order of precutting and lamination curing without technical teaching. In the next step, even if the process of the invention is adopted to firstly attach, cure and then cut, the requirement on the light transmittance of the adhesive is higher, the low light transmittance of the adhesive in the prior art can affect the identification of the pre-cut line, the requirement of the attaching process of the invention to attach, cure and then cut can not be met, the improvement process needs to be improved simultaneously and cooperatively in many aspects of production lines, equipment and adhesive, the technical personnel in the field can do so, and when the technical personnel in the field want to start from improving the adhesive, the attaching process in the prior art just needs to balance the fluidity and the viscosity of the adhesive, and the adhesive which simultaneously meets the requirement and has high light transmittance is difficult to find.
Furthermore, there is no study about the overlapping deviation relation between the pre-cutting mode, the attaching mode and the pre-cutting line in the prior art, and the prior art is limited by the properties of the adhesive, so that the person skilled in the art cannot know nor motivate to improve the prior art without technical teaching.
In summary, it can be seen that the bonding process system of the prior art is formed between the battery sheet and the protective layer, which are pre-cut in advance, and the two layers are bonded in alignment, and the fluidity and viscosity of the adhesive are balanced, so that it is difficult to solve the problem of large overlap deviation of the pre-cut lines by changing a certain link, and how to reduce the overlap deviation of the pre-cut lines on the protective layer and the pre-cut lines of the battery sheet in the prior art has become the technical problem that the skilled person would like to solve.
Therefore, the process of bonding, curing and cutting is optimized, so that fine adjustment and positioning are not needed when the battery piece is bonded with the protective layer, the requirement on fluidity and viscosity of the adhesive is reduced, the components of the adhesive can be further optimized to improve the light transmittance, the high light transmittance meets the requirement of bonding, curing and cutting in the new bonding process, and the conversion efficiency of the battery is improved. The lamination method and the adhesive form a synergistic effect, a brand new lamination process system is formed, and the lamination method and the adhesive have remarkable beneficial effects in the aspects of reducing the defective rate of products, improving the splitting precision, improving the conversion efficiency of batteries and the like.
Further, because the positions of the battery piece and the protective layer do not need to be finely adjusted, the problem of displacement caused by fine adjustment in the process of attaching the battery piece and the protective layer is avoided, dislocation of the pre-cutting line of the battery piece and the protective layer can be avoided, and reduction of the product yield is avoided.
The viscosity of the adhesive before curing is 500 to 1500mpa·s, and the viscosity of the adhesive before curing may be 500mpa·s, 800mpa·s, 1000mpa·s, 1200mpa·s, 1500mpa·s, or any value therebetween.
Preferably, the method of testing the viscosity of the adhesive before curing is referred to GB/T2794-2013, and is carried out by continuously rotating the LV series rotor at 12 rpm for 2 minutes at 25+ -0.5 ℃, and stabilizing the reading.
It should be noted that the adhesive in the prior art must balance fluidity and tackiness, and thus the viscosity of the adhesive in the prior art is usually in the range of 2000 to 3000mpa·s. In general, the higher the viscosity of the adhesive before curing, the lower the fluidity and the higher the viscosity of the adhesive, and the lower the viscosity of the adhesive before curing, the higher the fluidity and the lower the viscosity of the adhesive. Thus, the prior art must maintain viscosity within the above ranges to balance flowability and tackiness.
Furthermore, compared with the adhesive with balanced fluidity and viscosity which are necessary to be adopted in the prior art, the bonding method of the invention has no specific requirements on the fluidity and viscosity of the adhesive, and theoretically, the adhesive with any viscosity can be selected, and the adhesive is in the protection scope of the invention.
The invention adopts the adhesive with proper viscosity, not only can improve the light transmittance, but also can more quickly permeate and improve the wettability, further optimizes the initial adhesion, the final adhesion strength, the adhesion performance and the filling performance of the adhesive, can ensure firm adhesion between the battery piece and the protective layer, and improves the yield of the battery.
Further, the adhesive in the prior art may cause uneven surface during pressure bonding, form bubbles or affect the optical properties after curing, thereby reducing light transmittance. The adhesive with proper viscosity solves the inherent defect of the multifunctional glue with the fluidity and viscosity just needed to be balanced in the prior art, and provides a better solution for manufacturing the flexible component.
The adhesive of the present invention has a light transmittance of 95% or more, and the adhesive may have a light transmittance of 95%, 95.5%, 96%, 96.5%, 97%, 97.5%, 98%, 98.5%, 99%, 99.5%, or more and any value therebetween, for example.
Preferably, the adhesive is prepared into a smooth and flat sample with a thickness of 1.0+ -0.1 mm, and the light transmittance of the cured adhesive layer is measured by using a spectrophotometer at a transmitted light flux ratio of 300-1100 nm.
It should be noted that the adhesive in the prior art is subject to the requirement of balance of fluidity and viscosity, the viscosity is usually in the range of 2000-3000mpa·s, and the light transmittance is difficult to exceed 93% at the highest from the standpoint of component compounding.
It will be appreciated that the high light transmittance of the adhesive may help to improve the conversion efficiency of the battery, as the high light transmittance adhesive may allow more light to pass through, thereby increasing the light energy received by the battery sheet. In a photovoltaic cell, light energy is a key factor of converting the cell into electric energy, more light energy is absorbed by a cell sheet, meaning that more photons can excite electrons to generate current, and further the power generation efficiency of the cell is improved. In addition, the high-light-transmittance adhesive glue can reduce light reflection and scattering, reduce energy loss and further improve the light absorption efficiency and the overall performance of the battery.
Further, the light transmittance of the adhesive glue further affects the formation of the second pre-cut line by pre-cutting the surface of the protective layer by aligning the first pre-cut line in addition to improving the battery conversion efficiency. The flexible component structure is composed of the protective layer, the adhesive and the battery piece which are sequentially arranged, so that when the first pre-cutting line is aligned, the first pre-cutting line is required to be visually identified through the protective layer and the adhesive, and therefore the light transmittance of the adhesive also determines the accuracy of the first pre-cutting line alignment, and further the overlapping deviation of the battery piece and the protective layer pre-cutting line is affected. Therefore, the technical scheme of directly using the adhesive in the prior art to match the adhesive of the invention with the adhesive which is firstly bonded, cured and then cut is not practical, because the low light transmittance of the adhesive in the prior art cannot meet the process requirement of the new bonding process, the light transmittance is too low, the visual recognition is fuzzy, and the overlapping deviation is obviously improved.
Further, the adhesive glue is one or a combination of silica gel, EVA glue, POE glue and double-sided glue. The invention is not particularly limited in the kind of adhesive, and it is within the scope of the invention if the adhesive in the prior art can achieve the viscosity and transmittance effects mentioned in the present invention.
In order to further adapt the process of the present invention, the present invention also provides a silicone gel of improved composition. Further, the adhesive comprises, by mass, 60-80% of vinyl silicone oil, 10-25% of a cross-linking agent, 5-10% of a platinum catalyst, 1-5% of a filler and 1-3% of a tackifier.
Preferably, the vinyl silicone oil is 60-80% by mass, and may be 60%, 63%, 65%, 68%, 70%, 73%, 75%, 78%, 80% by mass, and any value therebetween.
Preferably, the phenyl vinyl silicone oil content in the vinyl silicone oil is 20-50%, and may be 20%, 25%, 30%, 35%, 40%, 45%, 50% and any value therebetween.
Further, the phenyl vinyl silicone oil content in the vinyl silicone oil has a significant effect on the viscosity, weather resistance and light transmittance of the adhesive. Firstly, the vinyl silicone oil is used for providing basic flexibility, viscosity and curing performance for the organic silica gel, and the phenyl group in the phenyl vinyl silicone oil can be combined with vinyl groups by adjusting the content of the phenyl vinyl silicone oil, so that the transparency and optical performance after curing are further improved, and turbidity or light scattering caused by material curing is reduced. According to the invention, the content of phenyl vinyl silicone oil in the vinyl silicone oil is improved, so that the viscosity and the light transmittance of the adhesive are optimized, a good bonding effect is ensured, and the photoelectric conversion efficiency of the battery is improved.
Preferably, the cross-linking agent is 10-25% by mass, and may be 10%, 13%, 15%, 18%, 20%, 23%, 25% by mass, and any value therebetween.
Further, the cross-linking agent is selected from one or a combination of hydrogen-containing silicone oil and methyl vinyl MQ silicone resin. The cross-linking agent is used for carrying out cross-linking reaction with vinyl silicone oil to enable the silica gel to be solidified and molded, form a three-dimensional network structure, and improve the performances of the silica gel, such as strength, hardness and the like.
Preferably, the mass percent of the platinum catalyst is 5-10%, and can be 5%, 6%, 7%, 8%, 9%, 10% and any value therebetween.
Further, the platinum catalyst is selected from one or a combination of vinyl siloxane platinum complex and chloroplatinic acid catalyst. The platinum catalyst is used for addition catalysis, so that the crosslinking reaction of the crosslinking agent and vinyl silicone oil can be effectively accelerated, the silica gel is solidified in a proper time, and the production efficiency is improved.
Preferably, the filler is 1-5% by mass, and may be 1%, 2%, 3%, 4%, 5% by mass, and any value therebetween.
Further, the filler is selected from one or a combination of silica aerogel and modified silica aerogel. The filler can improve the ultraviolet aging resistance of the silica gel and enhance the heat insulation capacity of the silica gel.
Preferably, the tackifier is 1% -3% by mass, and may be 1%, 1.5%, 2%, 2.5%, 3% and any value therebetween.
Further, the tackifier is an alpha, omega-dihydroxypolysiloxane. The alpha, omega-dihydroxyl polysiloxane has better viscosity, can further improve the adhesive property of the adhesive glue and ensures the structural stability of the component.
It should be noted that, on the basis of not significantly changing the viscosity and the light transmittance reference characteristic of the adhesive, other additives may be selectively added according to the actual application scenario, and may include, but not limited to, antioxidants, hydrophobing agents, leveling agents, and the like.
Further, the adhesive has a hardness of 30-55Shore A after curing. The adhesive obtained by improving the components of the invention has smaller solidification hardness, good flexibility, small stress required during splitting, smoother splitting process and more neat splitting edge, and is beneficial to improving the splitting efficiency and quality.
Further, the curing temperature of the adhesive is 60-110 ℃ and the curing time is 30-60 minutes. The reasonable curing temperature and the reasonable curing time can ensure that the adhesive is cured within a reasonable time, the required hardness and bonding strength are achieved, and meanwhile, the material properties of the battery piece and the protective layer are not adversely affected.
Further, the ratio of the first pre-cut line to the thickness of the battery piece is in the range of 1/3-2/3, and the maximum width of the first pre-cut line is in the range of 10 mu m-50 mu m. The reasonable depth and width of the first pre-cutting line can reduce the loss of the effective area of the battery piece and avoid breakage or splitting before lamination, thereby being beneficial to the subsequent lamination and splitting operation and reducing the loss of the efficiency of the battery assembly.
Further, the ratio of the second precut line to the thickness of the protective layer is in the range of 1/5-3/5, and the maximum width of the second precut line is in the range of 10 μm-80 μm. The reasonable depth and width of the second pre-cutting line can ensure the consistency of the pre-cutting line of the protective layer, and the follow-up splitting operation is facilitated.
Further, the surface of the protective layer is pre-cut by adopting laser cutting, a laser focus is positioned at a position, away from the upper surface of the battery piece, of the protective layer, which is 1/3-2/3 down, the laser power of the laser cutting is greater than or equal to 50W, the laser wavelength is 532nm, the pulse width is less than 15PS, the single pulse energy is greater than 200uj, the repetition frequency of laser pulses is 20kHz-1MHz, and the cutting speed is 1mm/s-3000mm/s.
It should be noted that, in the prior art, the laser focus for pre-cutting the surface of the protective layer is generally 1/2 to 3/4 of the surface of the protective layer. The ratio of the second pre-cut line to the thickness of the protective layer in the prior art is generally in the range of 1/3 to 2/3.
It will be appreciated that the laser focus of the pre-cut to the protective layer surface of the present invention will be shallower than the prior art, and therefore the depth of the second pre-cut line on the protective layer will be shallower, particularly because the high temperature generated during the laser cutting process may cause thermal degradation of the adhesive glue or damage to the underlying battery cells, since the cutting typically employs a laser cutting technique. In order to avoid the situation, the invention adjusts the focal depth of the laser for pre-cutting the protective layer, and the focal depth is shallower, thereby avoiding the damage to the battery piece in the cutting process of the protective layer, simultaneously the adhesive has high light transmittance, reducing the absorption of the adhesive to the laser in the cutting process of the laser adhesive, and effectively preventing the adhesive from oxidative degradation in the cutting process of the laser, so as to maintain the performance of the adhesive. Meanwhile, the depth of focus of the shallower cutting laser also reduces the depth of cut of the second pre-cutting line, further reduces the risk that the protective layer is cracked in advance before the splitting process is carried out, and is beneficial to improving the yield of the battery.
It will be appreciated that because of the good properties of the adhesive of the present invention, the protective layer may still split well at the time of breaking, even though the depth of cut of the second pre-cut line of the present invention is shallower than the prior art.
It will be appreciated that the strength of the laser cut used in the present invention is generally lower than the strength of the laser cut used in the prior art, and the damage to the underlying battery cells and adhesive may be avoided during pre-cutting of the protective layer.
Further, after forming the second pre-cut line, further comprising:
Removing the waste edges on the protective layer;
and splitting the protective layer, the adhesive glue and the battery pieces to form a plurality of small battery pieces.
It will be appreciated that the first pre-cut line, the second pre-cut line and the adhesive obtained by the present invention are more advantageous for subsequent breaking operations.
It will be appreciated that the specific steps of removing the scrap and battery splits are not particularly limited in the present invention, as long as the prior art is referenced.
In a second aspect, the invention provides a laminating system of a flexible component battery piece and a protective layer, wherein the system is applied to a laminating method of the flexible component battery piece and the protective layer, and comprises a pre-cutting device, a laminating device and a positioning device; the battery piece is provided with a battery piece surface, a pre-cutting device, a bonding device and an alignment device, wherein the pre-cutting device is used for pre-cutting the surface of the battery piece to form a first pre-cutting line and pre-cutting the surface of the protective layer to form a second pre-cutting line, the bonding device is used for bonding the battery piece and the protective layer through bonding glue and then solidifying the bonding glue, and the alignment device is used for assisting the pre-cutting device to align the first pre-cutting line.
The battery piece surface is pre-cut through the pre-cutting device to form a first pre-cutting line, the bonding device is used for bonding the battery piece and the protective layer through the bonding adhesive, the bonding adhesive is solidified, at the moment, the alignment device and the pre-cutting device are located above the protective layer, the bonding adhesive and the battery piece are sequentially arranged below the protective layer, and the alignment device assists the pre-cutting device to pre-cut the first pre-cutting line to form a second pre-cutting line.
Further, the pre-cutting device may be a laser cutting device, the alignment device may be a CCD alignment device, and the attaching device may include a glue spreading module for applying a glue between the battery sheet and the protective layer, a pressing module for pressing the protective layer against the battery sheet, and a heat curing module for heat-curing the glue.
Further, the system can further comprise a slitter edge removing device for removing slitter edges on the protective layer, and a splitting device for splitting the protective layer, the adhesive and the battery slices.
The present invention will be specifically described below by way of examples, but the present invention is not limited to these examples.
Example 1
As shown in fig. 1, a method for attaching a battery piece of a flexible component and a protective layer includes the following steps:
Pre-cutting the surface of the battery piece to form a first pre-cutting line;
Bonding the battery piece and the protective layer through the adhesive, and then solidifying the adhesive;
and pre-cutting the surface of the protective layer by aligning the first pre-cutting line to form a second pre-cutting line.
And pre-cutting the surface of the protective layer by adopting laser cutting, wherein the laser focus is positioned at a position 1/3-2/3 of the position, away from the upper surface of the battery piece, of the protective layer downwards.
The adhesive of the embodiment comprises the following components in percentage by mass of 70% of vinyl silicone oil, 19% of cross-linking agent, 5% of platinum catalyst, 5% of filler and 1% of tackifier.
The phenyl vinyl silicone oil content in the vinyl silicone oil used in this example was 35%, the crosslinking agent was methyl vinyl MQ silicone resin, the platinum catalyst was vinyl siloxane platinum complex, the filler was silica aerogel, and the tackifier was α, ω -dihydroxypolysiloxane.
Wherein the viscosity of the adhesive before curing is 1200 mPa.s, and the light transmittance of the adhesive is 98%.
Example 2
The method of attaching the flexible assembly battery sheet and the protective layer of example 2 was performed with reference to the method provided in example 1, except that the phenyl vinyl silicone oil content in the vinyl silicone oil used in example 2 was 20%.
Wherein the viscosity of the adhesive before curing is 800 mPas, and the light transmittance of the adhesive is 96%.
Example 3
The method of attaching the flexible assembly battery sheet and the protective layer of example 3 was performed with reference to the method provided in example 1, except that the phenyl vinyl silicone oil content in the vinyl silicone oil used in example 3 was 50%.
Wherein the viscosity of the adhesive before curing is 1500 mPa.s, and the light transmittance of the adhesive is 99%.
Example 4
The method for attaching the flexible module battery sheet and the protective layer of example 4 was performed with reference to the method provided in example 1, except that the adhesive of example 4 was composed of 60% by mass of vinyl silicone oil, 22% by mass of a crosslinking agent, 10% by mass of a platinum catalyst, 5% by mass of a filler, and 3% by mass of a tackifier.
Wherein the viscosity of the adhesive before curing is 500 mPas, and the light transmittance of the adhesive is 95%.
Example 5
The method for attaching the flexible module battery sheet and the protective layer of example 5 was performed with reference to the method provided in example 1, except that the adhesive of example 5 was composed of, by mass, 80% of vinyl silicone oil, 12% of a crosslinking agent, 5% of a platinum catalyst, 2% of a filler, and 1% of a tackifier.
Wherein the viscosity of the adhesive before curing is 1000 mPas, and the light transmittance of the adhesive is 97%.
Comparative example 1
As shown in fig. 2, in comparative example 1, a flexible component battery sheet and a protective layer are attached by using the prior art, and the method includes the following steps:
Pre-cutting the surface of the battery piece to form a first pre-cutting line, and pre-cutting the surface of the protective layer to form a second pre-cutting line;
bonding the battery piece and the protective layer through adhesive glue, and then aligning the first pre-cutting line and the second pre-cutting line;
and curing the adhesive after the alignment is finished.
Wherein the adhesive glue commonly used in the prior art is adopted, the viscosity of the adhesive glue before curing is 2500 mPa.s, and the light transmittance of the adhesive glue is 92%.
Comparative example 2
The attaching method of the flexible assembly battery sheet and the protective layer of comparative example 2 was performed with reference to the method provided in comparative example 1, except that the adhesive paste in comparative example 2 was the adhesive paste used in the method provided in example 1.
Comparative example 3
The attaching method of the flexible assembly battery sheet and the protective layer of comparative example 3 was performed with reference to the method provided in example 1, except that the adhesive paste in comparative example 3 was the adhesive paste used in the method provided in comparative example 1.
Comparative example 4
The attaching method of the flexible assembly battery sheet and the protective layer of comparative example 4 was performed with reference to the method provided in example 1, except that the laser focus was positioned 1/2 to 3/4 down the upper surface of the protective layer away from the battery sheet in comparative example 4.
Test case
The flexible assemblies obtained in examples and comparative examples were tested and the results are shown in table 1. The alignment and lamination precision deviation refers to the deviation distance between the central lines of the first pre-cutting line and the second pre-cutting line, and the battery split control yield refers to the qualification rate of the battery with defects after the split is removed in 1000 batteries in each batch.
TABLE 1
As shown in table 1, it can be obtained according to examples 1 to 5 that the transmittance of the adhesive can be effectively improved and the battery conversion efficiency of the flexible assembly can be further improved by adopting the preferable composition and proportioning parameters of the adhesive. The adoption of the preferable adhesive is also beneficial to further reducing the deviation of alignment laminating precision and improving the yield of the battery.
According to the comparison of the comparative example 1 and the example 1, the protective layer is pre-cut after being attached, so that the risk of early cracking in the moving or carrying process is avoided, and the product yield is remarkably improved. According to the invention, the protective layer is pre-cut through the alignment first pre-cutting line, so that the precise alignment of the protective layer and the battery piece pre-cutting line is ensured, and the alignment laminating precision deviation is effectively reduced.
According to the comparison of the comparative example 1, the comparative example 2 and the example 1, the invention successfully solves the problem of higher requirement on the fluidity of the adhesive by optimizing the process of laminating and solidifying the protective layer and then precutting the protective layer, and the adhesive used in the laminating process after matching optimization has lower requirement on the fluidity. The invention improves the components of the adhesive on the basis of the light transmittance, and is beneficial to improving the conversion efficiency of the battery.
According to the comparison of the comparative example 3 and the example 1, the adhesive used in the matched and optimized laminating process has higher light transmittance, is beneficial to improving the battery conversion efficiency, and is also beneficial to further reducing the deviation of alignment laminating precision and improving the battery yield.
According to the comparison of the comparative example 4 and the example 1, the invention adjusts the focal depth of the pre-cutting laser of the protective layer, and the focal depth is adjusted to be shallower, so that the damage to the battery piece and the adhesive in the cutting process of the protective layer is avoided.
The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, a number of simple variants of the technical solution of the invention are possible, including combinations of the individual technical features in any other suitable way, which simple variants and combinations should likewise be regarded as being disclosed by the invention, all falling within the scope of protection of the invention.
Claims (12)
1. A method for attaching a battery plate and a protective layer of a flexible assembly, the method comprising the steps of:
Pre-cutting the surface of the battery piece to form a first pre-cutting line;
bonding the battery piece and the protective layer through adhesive glue, and then solidifying the adhesive glue;
pre-cutting the surface of the protective layer by aligning the first pre-cutting line to form a second pre-cutting line;
wherein the viscosity of the adhesive before curing is 500-1500 mPa.s, and the light transmittance of the adhesive is more than or equal to 95%.
2. The method for attaching a battery sheet and a protective layer of a flexible assembly according to claim 1, wherein the adhesive is one or a combination of silicone, EVA, POE, and double sided adhesive.
3. The method for attaching the flexible component battery piece and the protective layer according to claim 1, wherein the adhesive comprises, by mass, 60-80% of vinyl silicone oil, 10-25% of a cross-linking agent, 5-10% of a platinum catalyst, 1-5% of a filler and 1-3% of a tackifier.
4. A method of attaching a flexible assembly battery sheet to a protective layer as defined in claim 3, wherein the phenyl vinyl silicone oil content in the vinyl silicone oil is 20 to 50%.
5. The method of attaching a flexible component battery sheet and a protective layer according to claim 3, wherein the cross-linking agent is one or a combination of hydrogen-containing silicone oil and methyl vinyl MQ silicone resin;
and/or the number of the groups of groups,
The platinum catalyst is selected from one or a combination of vinyl siloxane platinum complex and chloroplatinic acid catalyst;
and/or the number of the groups of groups,
The filler is selected from one or a combination of silica aerogel and modified silica aerogel;
and/or the number of the groups of groups,
The tackifier is alpha, omega-dihydroxypolysiloxane.
6. A method of conforming a flexible component battery sheet to a protective layer according to claim 3 wherein the adhesive has a hardness of 30 to 55shore a after curing.
7. The method of claim 1, wherein the adhesive has a curing temperature of 60-110 ℃ and a curing time of 30-60 minutes.
8. The method for attaching a battery sheet and a protective layer of a flexible assembly according to claim 1, wherein the ratio of the first pre-cut line to the thickness of the battery sheet is in the range of 1/3-2/3, and the maximum width of the first pre-cut line is in the range of 10 μm-50 μm.
9. The method for attaching a battery plate and a protective layer of a flexible assembly according to claim 1, wherein the ratio of the second pre-cut line to the thickness of the protective layer is in the range of 1/5-3/5, and the maximum width of the second pre-cut line is in the range of 10 μm-80 μm.
10. The method for attaching the flexible assembly battery piece and the protective layer according to claim 1, wherein the surface of the protective layer is pre-cut by laser cutting, a laser focus is positioned at a position 1/3-2/3 of the position, away from the upper surface of the battery piece, of the protective layer, the laser power of the laser cutting is greater than or equal to 50W, the laser wavelength is 532nm, the pulse width is less than 15PS, the single pulse energy is greater than 200uj, the repetition frequency of the laser pulse is 20kHz-1MHz, and the cutting speed is 1mm/s-3000mm/s.
11. The method of attaching a battery sheet and a protective layer of a flexible assembly of claim 1, further comprising, after forming the second pre-cut line:
removing the slitter edges on the protective layer;
and splitting the protective layer, the adhesive and the battery pieces to form a plurality of small battery pieces.
12. A bonding system of a flexible component battery sheet and a protective layer, wherein the bonding system is applied to the bonding method of a flexible component battery sheet and a protective layer as defined in any one of claims 1 to 11, the bonding system comprising:
the pre-cutting device is used for pre-cutting on the surface of the battery piece to form a first pre-cutting line and pre-cutting on the surface of the protective layer to form a second pre-cutting line;
The laminating device is used for laminating the battery piece and the protective layer through adhesive glue and then solidifying the adhesive glue;
and the alignment device is used for assisting the pre-cutting device to align the first pre-cutting line.
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