Battery monomer surface insulation method and battery monomer surface insulation equipment

Abstract

The embodiment of the invention provides a battery monomer surface insulation method and battery monomer surface insulation equipment. The battery monomer surface insulation method comprises the following steps: a cleaning process: cleaning a to-be-insulated surface of a battery monomer; an ink-jet printing process: forming an ultraviolet curing ink layer on the to-be-insulated surface by an ink-jet printing method; and a curing step of curing the UV-curable ink layer by irradiating the UV-curable ink layer with UV-light. The battery monomer subjected to insulation treatment through the battery monomer surface insulation method has relatively high reliability.

Description

Battery cell surface insulation method and battery cell surface insulation equipment Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell surface insulation method and a battery cell surface insulation device. Background Art

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. Electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of the sustainable development of the automotive industry. For electric vehicles, battery technology is a key factor in their development.

[0003] During the manufacturing process of batteries, battery reliability is an issue that cannot be ignored. Therefore, how to improve battery reliability is a technical problem that needs to be solved urgently in battery technology.

[0004] Summary of the Invention

[0005] The present application provides a battery cell surface insulation method and a battery cell surface insulation device, and the battery cell after insulation treatment has high reliability.

[0006] This application is achieved through the following technical solutions:

[0007] In a first aspect, the present application provides a method for insulating the surface of a battery cell, comprising: a cleaning process for cleaning the surface to be insulated of the battery cell; an inkjet printing process for forming a UV-curable ink layer on the surface to be insulated by an inkjet printing method; and a curing process for curing the UV-curable ink layer by irradiating it with UV light.

[0008] According to the battery cell surface insulation method of the embodiment of the present application, the operation process is simple, the UV-curable ink layer has a beautiful appearance, the UV-curable ink layer has a strong adhesion to the surface to be insulated, the UV-curable ink layer is not easy to fall off, the thickness of the UV-curable ink layer can be thicker, and the UV-curable ink layer has good insulation performance, so that the battery cell has higher insulation performance, thereby making the battery cell have higher reliability.

[0009] According to some embodiments of the present application, the curing process includes: a pre-curing process, in which the UV-curable ink layer is irradiated with UV light of a first light intensity to pre-cure it; and a final curing process, in which the pre-cured UV-curable ink layer is irradiated with UV light of a second light intensity to final cure it; wherein the first light intensity is less than the second light intensity.

[0010] In the above scheme, the first light intensity is less than the second light intensity. The ultraviolet light of the first light intensity can be closer to the inkjet printing device than the ultraviolet light of the second light intensity, so as to pre-cure the ultraviolet light-curable ink layer and reduce the risk of the ultraviolet light curing the ultraviolet light-curable ink in the inkjet printing device and causing blockage. The pre-curing process pre-cures the ultraviolet light-curable ink layer (i.e., slightly cures it), reducing the risk of sagging of the ultraviolet light-curable ink layer of the battery cell and reducing the probability of the liquid ultraviolet light-curable ink layer leveling when reaching the final curing process area. The final curing process final cures the pre-cured ultraviolet light-curable ink layer, so that the thickness consistency of the ultraviolet light-curable ink layer is better.

[0011] According to some embodiments of the present application, after completing the final curing process of the UV-curable ink layer on one surface to be insulated, the battery cell is flipped over, and the inkjet printing process, the pre-curing process, and the final curing process are repeated to form UV-curable ink layers on multiple surfaces to be insulated of the battery cell and final cure them.

[0012] In the above scheme, after the UV-curable ink layer on the surface to be insulated is subjected to the pre-curing process and the final curing process, another surface to be insulated is insulated, which can reduce the risk of UV-curable ink sagging and make the thickness consistency of the UV-curable ink layer on the surface to be insulated better.

[0013] According to some embodiments of the present application, before the final curing process, the battery cell is turned over, and the inkjet printing process and the pre-curing process are repeated to form a UV-curable ink layer on multiple surfaces to be insulated of the battery cell and pre-cured.

[0014] In the above scheme, before the final curing process, the battery cell is turned over, and the inkjet printing process and the pre-curing process are repeated to form a UV-curable ink layer on multiple surfaces to be insulated of the battery cell and pre-cured. In the final curing process, the UV-curable ink layer on at least most of the surfaces to be insulated is final-cured to complete the insulation treatment of the multiple surfaces to be insulated of the battery cell, thereby improving production efficiency.

[0015] According to some embodiments of the present application, the first light intensity is Q1, and the second light intensity is Q2, satisfying 240≤Q2 / Q1≤260.

[0016] In the above scheme, the first light intensity and the second light intensity satisfy the above relationship. On the one hand, the ultraviolet light of the first light intensity can be closer to the inkjet printing device than the ultraviolet light of the second light intensity, reducing the risk of ultraviolet light curing the ultraviolet light-curing ink of the inkjet printing device and causing blockage; on the other hand, it can facilitate the pre-curing of the ultraviolet light-curing ink layer and reduce the risk of the ultraviolet light-curing ink layer sagging; on the other hand, it can facilitate the ultraviolet light of the second light intensity to quickly cure the ultraviolet light-curing ink layer and reduce waste.

[0017] According to some embodiments of the present application, the irradiation time of the UV-curable ink layer by the UV light of the first intensity is T1, and the irradiation time of the UV light of the second intensity is T2, satisfying 2.2≤T2 / T1≤2.8.

[0018] In the above solution, the irradiation time of the ultraviolet light of the first light intensity and the irradiation time of the ultraviolet light of the second light intensity satisfy the above relationship, which can not only cure the ultraviolet light curable ink layer but also save time.

[0019] According to some embodiments of the present application, during the curing process, the distance between the UV light source and the UV-curable ink layer is 3 mm to 20 mm.

[0020] In the above solution, the distance between the UV light source and the UV-curable ink layer is selected within the above range to meet the requirements of UV irradiation of the UV-curable ink layer. If the distance between the UV light source and the UV-curable ink layer is too close (e.g., less than 3mm), the temperature will overheat, the performance of the battery cell will be damaged, and interference between the UV light source and the battery cell will be easily caused. If the distance between the UV light source and the UV-curable ink layer is too far (e.g., greater than 20mm), the light intensity will be insufficient, and the curing effect will be poor.

[0021] According to some embodiments of the present application, the cleaning process includes: performing laser cleaning on the surface to be insulated of the battery cell, and / or performing plasma cleaning on the surface to be insulated of the battery cell.

[0022] In the above solution, laser cleaning of the surface of the battery cell to be insulated can remove the oxide layer, rust, and other attachments on the surface to be insulated, giving the surface a certain degree of roughness to improve the adhesion of the UV-curable ink layer to the surface to be insulated. Plasma cleaning can remove dirt, dust, and other debris from the surface to be insulated, improving the surface properties of the surface to be insulated, for example, by increasing the wettability of the surface to be insulated and improving the adhesion of the UV-curable ink layer.

[0023] According to some embodiments of the present application, in the inkjet printing process, a UV-curable ink layer is formed on the surface to be insulated by an inkjet printing device, and the distance between the nozzle of the inkjet printing device and the surface to be insulated is 1 mm to 6 mm.

[0024] In the above scheme, a UV-curable ink layer is formed on the surface to be insulated by an inkjet printing device, which is simple to operate; the distance between the nozzle of the inkjet printing device and the surface to be insulated meets the above range, which is convenient for forming the UV-curable ink layer on the surface to be insulated and reduces the risk of interference between the nozzle and the battery cell, thereby facilitating the formation of the UV-curable ink layer on the surface to be insulated.

[0025] According to some embodiments of the present application, after the curing process, the battery cell surface insulation method further includes: detecting the thickness of the UV-curable ink layer; and / or performing a voltage resistance test on the UV-curable ink layer.

[0026] In the above scheme, by testing the thickness of the UV-curable ink layer, any UV-curable ink layer that exceeds the preset thickness range can be promptly detected, allowing the inkjet printing parameters to be adjusted to bring the UV-curable ink layer thickness within the preset range, thereby achieving better thickness consistency. Performing a pressure resistance test on the UV-curable ink layer can detect defects such as shrinkage cavities, foreign matter, and coating leaks, allowing for the removal of unqualified products, ensuring higher quality of the insulated product and facilitating subsequent processing.

[0027] In a second aspect, the present application provides a battery cell surface insulation device, comprising: a cleaning device, an inkjet printing device, and a curing device. The cleaning device is used to clean the surface of the battery cell to be insulated; the inkjet printing device is used to form a UV-curable ink layer on the surface to be insulated; and the curing device is used to irradiate the UV-curable ink layer with UV light to cure it.

[0028] The battery cell surface insulation device according to the embodiment of the present application facilitates forming a UV-curable ink layer on the surface to be insulated of the battery cell by cooperating with a cleaning device, an inkjet printing device, and a curing device, thereby achieving surface insulation treatment of the battery cell. Specifically, the cleaning device cleans the surface to be insulated of the battery cell, making it clean and facilitating the adhesion of the UV-curable ink; the inkjet printing device forms the UV-curable ink layer on the surface to be insulated, which is simple to operate; and the curing device irradiates the UV-curable ink layer with UV light to facilitate the curing of the UV-curable ink layer.

[0029] According to some embodiments of the present application, the curing device includes a first ultraviolet light irradiation lamp and a second ultraviolet light irradiation lamp, and the light intensity of the ultraviolet light emitted by the second ultraviolet light irradiation lamp is greater than the light intensity of the ultraviolet light emitted by the first ultraviolet light irradiation lamp.

[0030] In the above solution, the intensity of the ultraviolet light emitted by the second ultraviolet light irradiation lamp is greater than the intensity of the ultraviolet light emitted by the first ultraviolet light irradiation lamp, so that the ultraviolet curable ink layer can be irradiated with ultraviolet lights of different intensities.

[0031] According to some embodiments of the present application, the first ultraviolet light irradiation lamp includes an LED lamp, and the second ultraviolet light irradiation lamp includes an electrodeless lamp or a mercury lamp.

[0032] In the above scheme, the first ultraviolet light irradiation lamp includes an LED lamp, which emits ultraviolet light with low intensity, which can meet the irradiation requirements and has low production costs; the second ultraviolet light irradiation lamp includes an electrodeless lamp or a mercury lamp, which can emit ultraviolet light with higher intensity to meet the irradiation requirements.

[0033] According to some embodiments of the present application, the battery cell surface insulation device further includes: a flipping device for flipping the battery cell so that multiple surfaces to be insulated of the battery cell can selectively face the nozzle of the inkjet printing device.

[0034] In the above solution, by flipping the battery cell, multiple surfaces to be insulated of the battery cell can be selectively directed toward the nozzle of the inkjet printing device, so as to form UV-curable ink layers on the multiple surfaces to be insulated.

[0035] According to some embodiments of the present application, the battery cell surface insulation device further includes: a conveying device for conveying the battery cell so that the battery cell passes through the cleaning device, the inkjet printing device, and the curing device in sequence.

[0036] In the above solution, the battery cells are transported by the transport device, so as to facilitate the transport of the battery cells between different workstations and improve production efficiency.

[0037] According to some embodiments of the present application, the cleaning device includes a laser cleaning component and a plasma cleaning component. The laser cleaning component is used to perform laser cleaning on the insulating surface, and the plasma cleaning component is used to perform plasma cleaning on the insulating surface.

[0038] In the above scheme, the surface to be insulated is laser cleaned and plasma cleaned by a laser cleaning component and a plasma cleaning component respectively. On the one hand, it is convenient to clean oil, debris, etc. on the surface to be insulated, so that the surface to be insulated is clean and the appearance defect rate of the ultraviolet light curing ink layer formed on the surface to be insulated is reduced. On the other hand, the surface to be insulated has a certain roughness and surface energy, thereby improving the adhesion between the surface to be insulated and the ultraviolet light curing ink layer.

[0039] According to some embodiments of the present application, the battery cell surface insulation device further includes: a first detection component for detecting the thickness of the UV-curable ink layer; and / or a second detection component for detecting the pressure resistance performance of the UV-curable ink layer.

[0040] In the above scheme, the first detection component detects the thickness of the UV-curable ink layer, enabling timely detection of UV-curable ink layers exceeding a preset thickness range. This allows for adjustment of inkjet printing parameters to bring the UV-curable ink layer thickness within the preset range, thereby achieving better thickness consistency. The second detection component detects the pressure resistance of the UV-curable ink layer, enabling detection of defects such as shrinkage cavities, foreign matter, and coating leaks, facilitating the removal of substandard products, ensuring higher quality of insulated products and facilitating subsequent processing.

[0041] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. 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 the drawings without creative work.

[0043] FIG1 is a schematic flow chart of a battery cell surface insulation method provided by some embodiments of the present application;

[0044] FIG2 is a schematic flow chart of a curing process according to some embodiments of the present application;

[0045] FIG3 is a schematic flow chart of a battery cell surface insulation method provided in some other embodiments of the present application;

[0046] FIG4 is a schematic flow chart of a battery cell surface insulation method provided in some other embodiments of the present application;

[0047] FIG5 is a schematic flow chart of a battery cell surface insulation method provided in some other embodiments of the present application;

[0048] FIG6 is a simplified schematic diagram of a battery cell surface insulation device provided by some embodiments of the present application;

[0049] FIG7 is a schematic diagram of a battery cell surface insulation device provided in some other embodiments of the present application;

[0050] FIG8 is a schematic flow chart of a battery cell surface insulation method provided in some other embodiments of the present application;

[0051] In the drawings, the drawings are not drawn to scale.

[0052] Marking explanation: 100 - battery cell surface insulation equipment; 11 - cleaning device; 111 - laser cleaning assembly; 112 - plasma cleaning assembly; 12 - inkjet printing device; 13 - curing device; 131 - first ultraviolet light irradiation lamp; 132 - second ultraviolet light irradiation lamp; 14 - turning device; 15 - conveying device; 16 - first detection assembly; 17 - second detection assembly; 18 - light shielding plate; 300 - battery cell; 31 - surface to be insulated; 32 - ultraviolet light curing ink layer. DETAILED DESCRIPTION

[0053] The following detailed description of the embodiments of the present application is provided in conjunction with the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of the present application, but are not intended to limit the scope of the present application, that is, the present application is not limited to the described embodiments.

[0054] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0055] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.

[0056] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0057] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0058] The term "and / or" in this application simply describes an association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists, A and B exist at the same time, and B exists. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0059] The term "multiple" in this application refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0060] In this application, the battery referred to herein refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in this application may include a battery module or a battery pack.

[0061] The development of battery technology must take into account multiple design factors at the same time, such as energy density, discharge capacity, charge and discharge rate and other performance parameters. In addition, battery reliability must also be considered.

[0062] In battery technology, many factors can affect battery reliability, including poor assembly of battery cell components, short circuits between internal components, and poor surface insulation. For example, poor surface insulation can cause short circuits if the cell comes into contact with other components, leading to contact between the positive and negative electrodes. This can lead to serious risks such as fire and explosion.

[0063] The outer shell of a battery cell is typically made of metal, such as copper, iron, aluminum, stainless steel, or aluminum alloy, to ensure high mechanical properties. Therefore, the surface of the battery cell typically requires insulation treatment to reduce the risk of short circuits between the battery cell and other components. For example, an insulating film is used to wrap the surface of the battery cell. However, when the insulating film is wrapped around the surface of the battery cell, the adhesion between the battery cell surface and the insulating film is poor, and bubbles easily form between the insulating film and the battery cell surface, or the insulating film wrinkles, resulting in a poor appearance of the battery cell and easy damage to the insulating film, affecting the insulation performance of the battery cell and other components. Furthermore, when the insulating film is wrapped around the battery cell, the insulating film is repeatedly applied to the edges and corners of the battery cell, affecting the subsequent assembly dimensions. Condensation on the battery cell during use can easily penetrate through the splicing area of ​​the insulating film, connecting to the outer shell of the battery cell and external structures, causing the insulating film to lose its insulation properties. The poor surface insulation performance of the battery cell mentioned above makes it easy for the battery cell to short circuit with other components, resulting in low reliability of the battery cell.

[0064] In view of this, in order to solve the problem of low reliability of battery cells caused by poor insulation effect on the surface of battery cells, an embodiment of the present application provides a technical solution, which uses a cleaning process, an inkjet printing process and a curing process to clean the surface of the battery cell to be insulated, and form a UV-curable ink layer on the surface to be insulated and cure it to achieve insulation treatment of the battery cell surface, so that the surface of the battery cell has a better insulation effect, thereby making the battery cell have higher reliability.

[0065] In such a treatment method, the surface to be insulated of the battery cell is cleaned to remove oil, dirt, etc. on the surface to be insulated, so that the surface to be insulated is clean, so that the ultraviolet light curing ink can adhere to the surface to be insulated, and the thickness of the ultraviolet light curing ink layer formed on the surface to be insulated can be thicker; the ultraviolet light curing ink layer is formed on the surface to be insulated by an inkjet printing method, the operation process is simple and the production efficiency is high; the ultraviolet light curing ink layer is irradiated with ultraviolet light to promote the curing of the ultraviolet light curing ink layer, and the thickness consistency of the ultraviolet light curing ink layer is good.

[0066] The battery cell surface insulation method disclosed in the embodiment of the present application can be used for, but is not limited to, surface insulation treatment of the outer shell of the battery cell. In other embodiments, the insulation method can also be used for surface insulation treatment of the component to be insulated.

[0067] For the convenience of description, the following embodiments take the insulation treatment of the surface of the housing as an example to introduce the insulation treatment of the battery cell surface.

[0068] Please refer to Figure 1, which shows a schematic flow chart of a battery cell surface insulation method provided by some embodiments of the present application. As shown in the figure, the battery cell surface insulation method 200 may include:

[0069] 210, a cleaning process, cleaning the surface of the battery cell to be insulated;

[0070] 220, inkjet printing process, forming a UV curable ink layer on the surface to be insulated by an inkjet printing method;

[0071] 230 , a curing step of curing the UV-curable ink layer by irradiating the UV-curable ink layer with UV light.

[0072] In the "cleaning process, cleaning the surface of the battery cell to be insulated", a dry cleaning method can be used to remove oil, dirt, etc. on the surface to be insulated, for example, an oxide layer, electrolyte, oil, rust, sweat, dust, etc. on the surface to be insulated.

[0073] After cleaning, the surface to be insulated can have good adhesion to the UV-curable ink, so that the thickness of the UV-curable ink layer can be thicker. For example, the thickness of the UV-curable ink layer can be 40μm to 120μm. If the thickness of the UV-curable ink layer is thin (such as less than 40μm), the pressure resistance of the UV-curable ink layer is insufficient and it is easily damaged. If the thickness of the UV-curable ink layer is thick (such as greater than 120μm), it is easy to cause incomplete UV light illumination, insufficient adhesion of the UV-curable ink layer, and easy detachment of the UV-curable ink layer.

[0074] The inkjet printing method refers to spraying UV-curable ink onto the surface to be insulated to form a UV-curable ink layer.

[0075] During the inkjet printing process, the UV-curable ink layer formed on the surface to be insulated can be in a liquid state. During the curing process, the photoinitiator in the UV-curable ink layer absorbs UV radiation to form free radicals, which react with the prepolymer and monomer to undergo cross-linking polymerization, thereby curing the liquid UV-curable ink layer to form a solid UV-curable ink layer.

[0076] UV-curable inks are those that form and dry under ultraviolet light, using UV light of varying wavelengths and energies. When formed on the surface to be insulated via inkjet printing, these UV-curable ink layers offer an aesthetically pleasing appearance, simple operation, and high production efficiency.

[0077] Curing refers to the process of converting UV curable ink from liquid to solid, for example, UV curable ink film formation.

[0078] In the inkjet printing process, an ultraviolet curing ink can be sprayed on the surface to be insulated by an inkjet printing device to form an ultraviolet curing ink layer.

[0079] Irradiating the UV-curable ink layer with UV light can promote the UV-curable ink layer to solidify, so that the thickness of the UV-curable ink layer has better consistency.

[0080] According to the battery cell surface insulation method of the embodiment of the present application, the operation process is simple, the production efficiency is high, the UV-curable ink layer has a beautiful appearance, the UV-curable ink layer has a strong adhesion to the surface to be insulated, the UV-curable ink layer is not easy to fall off, the thickness of the UV-curable ink layer can be thicker, and the UV-curable ink layer has good insulation performance, so that the battery cell has higher insulation performance, thereby making the battery cell have higher reliability.

[0081] Please refer to FIG. 2 , which shows a schematic flow chart of a curing process provided by some embodiments of the present application. According to some embodiments of the present application, the curing process includes:

[0082] 231, pre-curing step: irradiating the UV-curable ink layer with UV light of a first intensity to pre-cure the UV-curable ink layer;

[0083] 232, final curing step: irradiating the pre-cured UV-curable ink layer with UV light of a second intensity to final cure it;

[0084] The first light intensity is smaller than the second light intensity.

[0085] The ultraviolet light of the first intensity and the ultraviolet light of the second intensity are two ultraviolet lights of different intensities, the first intensity being less than the second intensity. The ultraviolet light of the first intensity can be provided by a first ultraviolet light irradiation lamp, and the ultraviolet light of the second intensity can be provided by a second ultraviolet light irradiation lamp.

[0086] Pre-curing refers to the initial curing (i.e., slight curing) of the UV-curable ink layer after it is irradiated with UV light of a first intensity. This prevents the UV-curable ink layer from flowing easily, reducing the risk of sagging. Pre-curing the UV-curable ink layer reduces the risk of sagging in the battery cell UV-curable ink layer and the probability of the liquid UV-curable ink layer leveling when it reaches the final curing process.

[0087] Final curing refers to irradiating the pre-cured UV-curable ink layer with UV light of a second intensity to completely cure the UV-curable ink layer. The final curing process is used to final cure the pre-cured UV-curable ink layer, so that the thickness of the UV-curable ink layer is more consistent.

[0088] If the intensity of the ultraviolet light is high and the ultraviolet light is close to the inkjet printing device, it will easily cause the ultraviolet curable ink of the inkjet printing device to solidify, thereby causing the nozzle of the inkjet printing device to be clogged, affecting inkjet printing.

[0089] In the above scheme, the first light intensity is less than the second light intensity, and the ultraviolet light of the first light intensity can be closer to the inkjet printing device than the ultraviolet light of the second light intensity, so as to pre-cure the ultraviolet light-curable ink layer and reduce the risk of ultraviolet light causing the ultraviolet light-curable ink in the inkjet printing device to solidify and cause blockage.

[0090] According to some embodiments of the present application, ultraviolet light of a first light intensity is arranged adjacent to an inkjet printing device. After the inkjet printing device forms an ultraviolet light-curable ink layer on the surface to be insulated, ultraviolet light of the first light intensity irradiates the ultraviolet light-curable ink layer to pre-cure the ultraviolet light-curable ink layer.

[0091] In some embodiments, a light blocking member may be provided between the pre-curing process and the inkjet printing process to block ultraviolet light, thereby reducing the risk of ultraviolet light irradiating the ultraviolet curable ink of the inkjet printing device, thereby reducing the risk of the ultraviolet curable ink in the inkjet printing device curing and clogging the inkjet printing device.

[0092] According to some embodiments of the present application, after completing the final curing process of the UV-curable ink layer on one surface to be insulated, the battery cell is flipped over, and the inkjet printing process, the pre-curing process, and the final curing process are repeated to form UV-curable ink layers on multiple surfaces to be insulated of the battery cell and final cure them.

[0093] After the final curing process of the UV-curable ink layer on the surface to be insulated is completed, the UV-curable ink layer forms a film. The UV-curable ink is easy to deform, which can reduce the risk of UV-curable ink sagging when moving the battery cell.

[0094] Flipping the battery cell means changing the posture of the battery cell, selectively placing different surfaces of the battery cell to be insulated on the inkjet printing device, repeating the inkjet printing process, pre-curing process and final curing process, so that a UV-curable ink layer can be formed on multiple surfaces of the battery cell to be insulated.

[0095] In the above scheme, after the UV-curable ink layer on the surface to be insulated is subjected to the pre-curing process and the final curing process, another surface to be insulated is insulated, which can reduce the risk of UV-curable ink sagging. After the UV-curable ink layer is formed on multiple surfaces to be insulated, the thickness consistency of the UV-curable ink layer on the surface to be insulated is better.

[0096] According to some embodiments of the present application, before the final curing process, the battery cell is turned over, and the inkjet printing process and the pre-curing process are repeated to form a UV-curable ink layer on multiple surfaces to be insulated of the battery cell and pre-cured.

[0097] Flipping the battery cell means orienting the different surfaces of the battery cell to be insulated toward the inkjet printing device to form a UV-curable ink layer on the different surfaces of the battery cell to be insulated. During the flipping process, the battery cell can be flipped by a robot or a clamp holding the battery cell.

[0098] For example, after the UV-curable ink layer on one surface to be insulated of the battery cell is pre-cured, the battery cell is turned over so that the next surface to be insulated of the battery cell faces the nozzle of the inkjet printing device, and the inkjet printing process and the pre-curing process are repeated to form a UV-curable ink layer on the surface to be insulated and pre-cured, until UV-curable ink layers are formed on all surfaces to be insulated of the battery cell and pre-cured, and then all UV-curable ink layers of the battery cell are finally cured.

[0099] In the above scheme, before the final curing process, the battery cell is turned over, and the inkjet printing process and the pre-curing process are repeated to form a UV-curable ink layer on multiple surfaces to be insulated of the battery cell and pre-cured. In the final curing process, the UV-curable ink layer on at least most of the surfaces to be insulated is final-cured to complete the insulation treatment of the multiple surfaces to be insulated of the battery cell, thereby improving production efficiency.

[0100] According to some embodiments of the present application, the first light intensity is Q1, and the second light intensity is Q2, satisfying 240≤Q2 / Q1≤260.

[0101] In some embodiments, Q2 / Q1 may be 240, 245, 250, 255, or 260, etc., and Q2 / Q1 may also be any other value between 240 and 260.

[0102] According to some embodiments of the present application, the first light intensity may be 110 mW / cm 2 ~130mW / cm 2 , the second light intensity can be 28000mW / cm 2 ~32000mW / cm 2 .

[0103] The first light intensity may be, but is not limited to, 110 mW / cm 2 、115mW / cm 2 , 120mW / cm 2 、125mW / cm 2 or 130mW / cm 2 The first light intensity can also be 110mW / cm 2 and 130mW / cm 2 Any other value in between.

[0104] The second light intensity can be but is not limited to 28000mW / cm 2 , 29000mW / cm 2 、30000mW / cm 2 、31000mW / cm 2 or 31000mW / cm 2The second light intensity can also be 28000mW / cm 2 and 32000mW / cm 2 Any other value in between.

[0105] The selection of the first light intensity range can meet the requirements of pre-curing the UV-curable ink on the insulating surface, but will not cure the UV-curable ink of the inkjet printing device. The first light intensity can be closer to the inkjet printing device than the second light intensity.

[0106] In the above scheme, the first light intensity and the second light intensity satisfy the above relationship (240≤Q2 / Q1≤260). On the one hand, the ultraviolet light of the first light intensity can be closer to the inkjet printing device than the ultraviolet light of the second light intensity, reducing the risk of ultraviolet light curing the ultraviolet light-curing ink of the inkjet printing device and causing blockage; on the other hand, it can facilitate the pre-curing of the ultraviolet light-curing ink layer and reduce the risk of the ultraviolet light-curing ink layer sagging; on the other hand, it can facilitate the ultraviolet light of the second light intensity to quickly cure the ultraviolet light-curing ink layer and reduce waste.

[0107] According to some embodiments of the present application, the irradiation time of the UV-curable ink layer by the UV light of the first intensity is T1, and the irradiation time of the UV light of the second intensity is T2, satisfying 2.2≤T2 / T1≤2.8.

[0108] In some embodiments, T2 / T1 may be 2.2, 2.3, 2.4, 2.5, 2.6, 2.7 or 2.8, etc. T2 / T1 may also be any other value between 2.2 and 2.8.

[0109] According to some embodiments of the present application, the irradiation time of the UV-curable ink layer with the UV light of the first light intensity may be 0.18s to 0.22s, and the irradiation time of the UV-curable ink layer with the UV light of the second light intensity may be 0.45s to 0.55s.

[0110] The irradiation time of the ultraviolet light of the first light intensity on the ultraviolet curable ink layer can be, but is not limited to, 0.18s, 0.19s, 0.20s, 0.21s or 0.22s.

[0111] The irradiation time of the ultraviolet light of the second light intensity on the ultraviolet curable ink layer can be, but is not limited to, 0.45s, 0.46s, 0.47s, 0.48s, 0.49s, 0.50s, 0.51s, 0.52s, 0.53s, 0.54s or 0.55s, etc.

[0112] In the above solution, the irradiation time of the ultraviolet light of the first intensity and the irradiation time of the ultraviolet light of the second intensity satisfy the above relationship (2.2≤T2 / T1≤2.8), which can not only cure the ultraviolet curable ink layer but also save time.

[0113] According to some embodiments of the present application, in the pre-curing process, the irradiation direction of the ultraviolet light of the first light intensity can be set perpendicular to the ultraviolet light curable ink layer.

[0114] According to some embodiments of the present application, during the curing process, the distance between the UV light source and the UV-curable ink layer may be 3 mm to 20 mm.

[0115] Optionally, the distance between the ultraviolet light source and the ultraviolet curable ink layer may be 5 mm to 10 mm.

[0116] Optionally, the distance between the UV light source and the UV-curable ink layer can be 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm or 20 mm, etc.

[0117] In the above solution, the distance between the ultraviolet light source and the ultraviolet curable ink layer is selected from the above range (3mm to 20mm) to meet the requirement of ultraviolet light irradiating the ultraviolet curable ink layer.

[0118] If the distance between the UV light source and the UV-curable ink layer is close (such as less than 3mm), the temperature will overheat, the performance of the battery cell will be damaged, and it will easily cause interference between the UV light source and the battery cell; if the distance between the UV light source and the UV-curable ink layer is far (such as greater than 20mm), the light intensity is insufficient and the curing effect is poor.

[0119] According to some embodiments of the present application, in the final curing process, ultraviolet light of the second intensity may irradiate the ultraviolet curable ink layer on at least one surface to be insulated of the battery cell from different directions.

[0120] Optionally, the ultraviolet light of the second light intensity can irradiate the ultraviolet curable ink layer on the surface to be insulated at multiple angles, so that the ultraviolet curable ink layer receives uniform ultraviolet light.

[0121] Optionally, in the final curing process, ultraviolet light of a second intensity is provided by multiple second ultraviolet light lamps (please refer to Figure 6), and the multiple second ultraviolet light lamps can be located above the battery cell. The ultraviolet light irradiation direction of the multiple second ultraviolet light lamps can intersect with the movement direction of the battery cell. For example, the ultraviolet light irradiation direction of one of the second ultraviolet light lamps is perpendicular to the movement direction of the battery cell, and the ultraviolet light irradiation direction of the multiple second ultraviolet light lamps can be tilted relative to the movement direction of the battery cell to irradiate the ultraviolet light-curing ink layer at different positions from different directions. That is, the tilted second ultraviolet light lamps can irradiate the ultraviolet light-curing ink layer at the edge of the battery cell.

[0122] The UV-curable ink layer on the edge of the battery cell can be cured by the second UV-light irradiation lamp arranged at an angle, so that the UV-curable ink layer on the surface to be insulated can receive uniform light, so that the UV-curable ink layer has a better thickness consistency of 200.

[0123] Optionally, in the second ultraviolet light irradiation lamp arranged obliquely, the ultraviolet light irradiation direction of the second ultraviolet light irradiation lamp can be inclined at an angle of 30° to 50° with respect to the moving direction of the battery cell, for example, 30°, 35°, 40°, 45° or 50°.

[0124] According to some embodiments of the present application, in the conveying direction of the battery cell, among the plurality of second ultraviolet light irradiation lamps arranged at an angle, the ultraviolet light irradiation direction of the second ultraviolet light irradiation lamp close to the first ultraviolet light irradiation lamp can be tilted away from the first ultraviolet light irradiation lamp, and the ultraviolet light irradiation direction of the second ultraviolet light irradiation lamp far from the first ultraviolet light irradiation lamp can be tilted toward the first ultraviolet light irradiation lamp. At the same time, the plurality of second ultraviolet light irradiation lamps arranged at an angle can be arranged around the battery cell to facilitate multi-angle irradiation of the edges of the battery cell.

[0125] According to some embodiments of the present application, the cleaning process includes: performing laser cleaning on the surface to be insulated of the battery cell, and / or performing plasma cleaning on the surface to be insulated of the battery cell.

[0126] In some embodiments of the present application, laser cleaning may be dry cleaning, and the oxide layer, rust, and other attachments on the surface of the object may be removed by laser ablation.

[0127] By laser cleaning the surface to be insulated of the battery cell, the oxide layer, electrolyte, oil, rust, sweat, dust, etc. on the surface to be insulated of the battery cell can be removed, and the surface to be insulated can have a certain degree of roughness to improve the adhesion of the UV curing ink layer to the surface to be insulated.

[0128] According to some embodiments of the present application, after the surface to be insulated is laser cleaned, the roughness of the surface to be insulated may be Rz, satisfying 5 μm ≤ Rz ≤ 20 μm.

[0129] After laser cleaning, the roughness of the surface to be insulated is tested with a roughness meter.

[0130] Optionally, 9μm≤Rz≤12μm.

[0131] Optionally, after the surface to be insulated is laser cleaned, the roughness Rz of the surface to be insulated can be 5μm, 6μm, 7μm, 8μm, 9μm, 10μm, 11μm, 12μm, 13μm, 14μm, 15μm, 16μm, 17μm, 18μm, 19μm or 20μm, etc.

[0132] According to some embodiments of the present application, after the surface to be insulated is laser cleaned, the glossiness of the surface to be insulated satisfies the following conditions: glossiness ≤ 100GU under the condition of 0 ≤ 60°.

[0133] After laser cleaning, the glossiness of the surface to be insulated is tested with a gloss meter.

[0134] In some embodiments of the present application, plasma cleaning may be dry cleaning, which may rely on the "activation effect" of active ions in the plasma to remove dirt, dust, etc. on the surface of an object.

[0135] In the above scheme, plasma cleaning can not only remove particles (such as dirt, dust, etc.) on the surface to be insulated of the battery cell, but also improve the surface properties of the surface to be insulated of the battery cell, for example, improving the wettability of the surface to be insulated and improving the adhesion of the UV-curable ink layer.

[0136] According to some embodiments of the present application, after the surface to be insulated is plasma cleaned, the surface tension of the surface to be insulated satisfies the following conditions: 32 dyn / cm≤surface tension≤72 dyn / cm.

[0137] Alternatively, the surface tension may be 32 dyn / cm, 34 dyn / cm, 36 dyn / cm, 38 dyn / cm, 40 dyn / cm, 42 dyn / cm, 44 dyn / cm, 46 dyn / cm, 48 dyn / cm, 50 dyn / cm, 52 dyn / cm, 54 dyn / cm, 58 dyn / cm, 60 dyn / cm, 62 dyn / cm, 64 dyn / cm, 68 dyn / cm, 70 dyn / cm, 72 dyn / cm.

[0138] After plasma cleaning, the surface to be insulated is measured with a dyne reagent to obtain the surface tension.

[0139] According to some embodiments of the present application, after the surface to be insulated undergoes a cleaning process, the adhesion between the surface to be insulated and the UV-curable ink layer is enhanced. After the UV-curable ink layer is cured, a hundred-grid test is performed on the UV-curable ink layer, and the adhesion of the UV-curable ink layer can be level 0 without falling off.

[0140] According to some embodiments of the present application, during the cleaning process, the surface of the battery cell to be insulated may be first laser cleaned, and then plasma cleaned. In other embodiments, during the cleaning process, the surface of the battery cell to be insulated may be first plasma cleaned, and then laser cleaned.

[0141] Laser cleaning and plasma cleaning are performed on the surface to be insulated. On the one hand, it is convenient to clean the oil, debris, etc. on the surface to be insulated, so that the surface to be insulated is clean and the appearance defect rate of the UV-curable ink layer formed on the surface to be insulated is reduced. On the other hand, the surface to be insulated has a certain roughness and surface energy, which improves the adhesion between the surface to be insulated and the UV-curable ink layer.

[0142] According to some embodiments of the present application, in the inkjet printing process, a UV-curable ink layer is formed on the surface to be insulated by an inkjet printing device, and the distance between the nozzle of the inkjet printing device and the surface to be insulated is 1 mm to 6 mm.

[0143] An ultraviolet curing ink layer is formed on the surface to be insulated by an inkjet printing device, and the operation is simple.

[0144] The distance between the nozzle of the inkjet printing device and the surface to be insulated meets the above range, which not only facilitates the formation of a UV-curable ink layer on the surface to be insulated, but also reduces the risk of interference between the nozzle and the battery cell, thereby facilitating the formation of a UV-curable ink layer on the surface to be insulated.

[0145] Optionally, the distance between the nozzle of the inkjet printing device and the surface to be insulated may be 2 mm to 3 mm;

[0146] Optionally, on the side of the battery cell where the electrode terminal is provided, the distance between the nozzle of the inkjet printing device and the surface to be insulated may be 4 mm to 5 mm, which can reduce the risk of interference between the nozzle and the electrode terminal.

[0147] Optionally, the distance between the nozzle of the inkjet printing device and the surface to be insulated may be 1 mm, 2 mm, 3 mm, 4 mm, 5 mm or 6 mm.

[0148] According to some implementations of the present application, the battery cell surface insulation method can be applied to both rectangular battery cells and cylindrical battery cells.

[0149] When applied to a rectangular battery cell, the battery cell can move along with the conveying device, and one surface of the battery cell to be insulated corresponds to the nozzle of the inkjet printing device. The inkjet printing device sprays UV-curable ink on the surface to be insulated to form a UV-curable ink layer on the surface to be insulated.

[0150] When applied to a cylindrical battery cell, when inkjet printing is performed on the circumferential surface of the battery cell, the battery cell can be driven to rotate by a driving device so that a UV-curable ink layer with uniform thickness can be formed on the circumferential surface of the battery cell.

[0151] According to some embodiments of the present application, in the inkjet printing process, the battery cells are transported and moved by the transport device, while the inkjet printing device is stationary.

[0152] According to some embodiments of the present application, the moving speed of the battery cell may be 4 m / min to 15 m / min.

[0153] The moving speed of the battery cells refers to the speed at which the conveying device conveys the battery cells.

[0154] Optionally, the moving speed of the battery cell may be 5 m / min to 11 m / min.

[0155] Optionally, the moving speed of the battery cell may be 4 m / min, 5 m / min, 6 m / min, 7 m / min, 8 m / min, 9 m / min, 10 m / min, 11 m / min, 12 m / min, 13 m / min, 14 m / min or 15 m / min, etc.

[0156] The battery cell's movement speed must be within the aforementioned range to allow the inkjet printing device to form a UV-curable ink layer of a certain thickness on the surface to be insulated, meeting inkjet printing requirements. If the battery cell's movement speed is too slow or too fast, the UV-curable ink layer formed on the surface to be insulated may not be thick enough to meet the requirements.

[0157] According to some embodiments of the present application, after the inkjet printing process, a UV-curable ink layer with a thickness of 40 μm to 120 μm can be formed on the surface to be insulated.

[0158] If the thickness of the UV-curable ink layer is thin (such as less than 40 μm), the pressure resistance of the UV-curable ink layer is insufficient and it is easily damaged; if the thickness of the UV-curable ink layer is thick (such as greater than 120 μm), the cost is high, the light exposure is not thorough, the adhesion of the UV-curable ink layer is insufficient, and it is easy to fall off.

[0159] Please refer to FIG3 , which shows a schematic flow chart of a battery cell surface insulation method provided by some other embodiments of the present application. According to some embodiments of the present application, after the curing process, the battery cell surface insulation method 200 further includes:

[0160] 240, detect the thickness of the UV curing ink layer.

[0161] Please refer to FIG4 , which shows a schematic flow chart of a battery cell surface insulation method provided by some embodiments of the present application. According to some embodiments of the present application, after the curing process, the battery cell surface insulation method 200 further includes:

[0162] 240, detecting the thickness of the UV-curable ink layer;

[0163] 250, perform pressure resistance test on UV curing ink layer.

[0164] Please refer to FIG5 , which shows a schematic flow chart of a battery cell surface insulation method provided by some embodiments of the present application. According to some embodiments of the present application, after the curing process, the battery cell surface insulation method 200 further includes:

[0165] 250, perform pressure resistance test on UV curing ink layer.

[0166] "240, detecting the thickness of the UV-curable ink layer", a magnetic induction or eddy current film thickness tester can be used to measure the thickness of the UV-curable ink layer at different points of the battery cell.

[0167] "250, perform voltage resistance test on UV-curable ink layer". You can use the voltage resistance meter to set the test parameter values ​​(such as test voltage, time, leakage current, etc.). One end of the output stage contacts the area of ​​the battery cell without UV-curable ink layer, and the other end is connected to the UV-curable ink layer area of ​​the battery cell wrapped with conductive foam to test the voltage resistance of the UV-curable ink layer.

[0168] In the above scheme, by testing the thickness of the UV-curable ink layer, any UV-curable ink layer that exceeds the preset thickness range can be promptly detected, allowing the inkjet printing parameters to be adjusted to bring the UV-curable ink layer thickness within the preset range, thereby achieving better thickness consistency. Performing a pressure resistance test on the UV-curable ink layer can detect defects such as shrinkage cavities, foreign matter, and coating leaks, allowing for the removal of unqualified products, ensuring higher quality of the insulated product and facilitating subsequent processing.

[0169] Please refer to Figure 6, which is a simplified schematic diagram of a battery cell surface insulation device provided in some embodiments of the present application. According to some embodiments of the present application, the present application provides a battery cell surface insulation device 100, which includes a cleaning device 11, an inkjet printing device 12, and a curing device 13. The cleaning device 11 is used to clean the surface to be insulated 31 of the battery cell 300; the inkjet printing device 12 is used to form a UV-curable ink layer 32 on the surface to be insulated 31; and the curing device 13 is used to irradiate the UV-curable ink layer 32 with UV light to cure it.

[0170] The cleaning device 11 is a device for cleaning the surface to be insulated 31 of the battery cell 300. It can remove dirt attached to the surface to be insulated 31 and make the surface to be insulated 31 have a certain roughness, glossiness and surface tension, so as to facilitate the attachment of ultraviolet light curing ink to the surface to be insulated 31, so that the bonding force between the surface to be insulated 31 and the ultraviolet light curing ink layer 32 is stronger.

[0171] The inkjet printing device 12 is a device for spraying UV-curable ink on the surface to be insulated 31 , so as to form a UV-curable ink layer 32 of uniform thickness on the surface to be insulated 31 .

[0172] The curing device 13 is a device for irradiating the UV curable ink layer 32 with UV light and curing the UV curable ink layer 32 . The curing device 13 may be a light source of UV light, such as a UV light irradiation lamp.

[0173] The cleaning device 11 is disposed at the cleaning station, the inkjet printing device 12 is disposed at the inkjet printing station, and the curing device 13 is disposed at the curing station.

[0174] According to the battery cell surface insulation device 100 of the embodiment of the present application, a cleaning device 11, an inkjet printing device 12, and a curing device 13 cooperate to form a UV-curable ink layer 32 on the surface 31 to be insulated of the battery cell 300, thereby achieving surface insulation treatment of the battery cell 300. Specifically, the cleaning device 11 cleans the surface 31 to be insulated of the battery cell 300, making it clean and facilitating the adhesion of the UV-curable ink. The inkjet printing device 12 forms the UV-curable ink layer 32 on the surface 31 to be insulated, which is simple to operate. The curing device 13 irradiates the UV-curable ink layer 32 with UV light, thereby facilitating the curing of the UV-curable ink layer 32.

[0175] 6 , according to some embodiments of the present application, the curing device 13 includes a first ultraviolet light irradiation lamp 131 and a second ultraviolet light irradiation lamp 132 , and the ultraviolet light intensity emitted by the second ultraviolet light irradiation lamp 132 is greater than the ultraviolet light intensity emitted by the first ultraviolet light irradiation lamp 131 .

[0176] The first ultraviolet irradiation lamp 131 and the second ultraviolet irradiation lamp 132 are both light sources that can emit ultraviolet light. The first ultraviolet irradiation lamp 131 is set at the pre-curing station, and the second ultraviolet irradiation lamp 132 is set at the final curing station.

[0177] The intensity of the ultraviolet light emitted by the second ultraviolet light irradiation lamp 132 is greater than the intensity of the ultraviolet light emitted by the first ultraviolet light irradiation lamp 131 , so that the ultraviolet curable ink layer 32 can be irradiated with ultraviolet lights of different intensities.

[0178] According to some embodiments of the present application, the number of the second ultraviolet light irradiation lamps 132 can be multiple, and the multiple second ultraviolet light irradiation lamps 132 are arranged at multiple positions, and some of the second ultraviolet light irradiation lamps 132 are tilted so that the multiple second ultraviolet light irradiation lamps 132 irradiate the battery cell 300 from different directions, and can irradiate the ultraviolet light-curing ink layer 32 of most of the surfaces to be insulated 31 of the battery cell 300.

[0179] According to some embodiments of the present application, the first ultraviolet light irradiation lamp 131 includes an LED lamp, and the second ultraviolet light irradiation lamp 132 includes an electrodeless lamp or a mercury lamp.

[0180] LED lights are also called light emitting diodes. LED lights are low energy and low cost.

[0181] Electrodeless lamp or mercury lamp has high power and wide luminous band.

[0182] In the above scheme, the first ultraviolet light irradiation lamp 131 includes an LED lamp, which emits ultraviolet light with low intensity, which can meet the irradiation requirements and has low cost; the second ultraviolet light irradiation lamp includes an electrodeless lamp or a mercury lamp, which can emit ultraviolet light with higher intensity to meet the irradiation requirements.

[0183] Please refer to Figure 7, which is a simplified schematic diagram of a battery cell surface insulation device according to some other embodiments of the present application. According to some embodiments of the present application, the battery cell surface insulation device 100 further includes a flipping device 14, which is used to flip the battery cell 300 so that the multiple surfaces 31 to be insulated of the battery cell 300 can selectively face the nozzle of the inkjet printing device 12.

[0184] The flipping device 14 may be a device for flipping the battery cell 300 , such as a robot, a clamp with flipping function, etc. The flipping device 14 can clamp the battery cell 300 and direct different surfaces of the battery cell 300 toward the nozzle of the inkjet printing device 12 .

[0185] Optionally, the flipping device 14 includes a robot arm, and a clamping assembly is provided at the end of the robot arm, which is used to clamp the battery cell 300. Under the action of the robot arm, multiple surfaces 31 to be insulated of the battery cell 300 can be selectively directed toward the nozzle of the inkjet printing device 12 to facilitate the nozzle to spray ultraviolet light curing ink on the surface 31 to be insulated.

[0186] In the above solution, by flipping the battery cell 300 , the multiple surfaces 31 to be insulated of the battery cell 300 can be selectively directed toward the nozzle of the inkjet printing device 12 , so as to form the UV-curable ink layer 32 on the multiple surfaces 31 to be insulated.

[0187] 6 and 7 , according to some embodiments of the present application, the battery cell surface insulation device 100 further includes a conveying device 15 , which is used to convey the battery cell 300 so that the battery cell 300 passes through the cleaning device 11 , the inkjet printing device 12 and the curing device 13 in sequence.

[0188] The conveyor 15 is used to transport the battery cells 300. For example, the conveyor 15 may include a belt conveyor or a roller conveyor. The battery cells 300 are placed on the carrying surface of the conveyor 15. Under the action of the conveyor 15, the battery cells 300 can pass through the cleaning device 11, the inkjet printing device 12, and the curing device 13 in sequence.

[0189] Optionally, the conveying device 15 may include a belt conveyor, and the battery cells 300 can move stably.

[0190] In the above solution, the battery cells 300 are transported by the transport device 15 , so as to facilitate the transport of the battery cells 300 between different workstations, thereby improving production efficiency.

[0191] In some embodiments, the battery cells 300 are transported by the conveying device 15. At the final curing station, the UV-curable ink layer 32 on surfaces of the battery cells 300 other than the surface supported by the conveying device 15 may be irradiated with UV light. It should be noted that the surface of the battery cells 300 supported by the conveying device 15 may have a small amount of UV-curable ink layer, and even if the UV light cannot directly irradiate the UV-curable ink layer, the UV-curable ink layer can still be cured.

[0192] 6 and 7 , according to some embodiments of the present application, the cleaning device 11 may include a laser cleaning component 111 and a plasma cleaning component 112 . The laser cleaning component 111 is used to perform laser cleaning on the insulating surface 31 , and the plasma cleaning component 112 is used to perform plasma cleaning on the insulating surface 31 .

[0193] The laser cleaning component 111 is a component used for performing laser cleaning on the surface to be insulated 31 . The laser cleaning component 111 can emit laser to clean the surface to be insulated 31 .

[0194] The plasma cleaning component 112 is a component for performing plasma cleaning on the surface to be insulated 31 . For example, the plasma cleaning component 112 may be a plasma cleaning machine.

[0195] In the above scheme, the surface to be insulated 31 is laser cleaned and plasma cleaned by the laser cleaning component 111 and the plasma cleaning component 112 respectively. On the one hand, it is convenient to clean the oil, debris, etc. on the surface to be insulated 31, so that the surface to be insulated 31 is clean, and the appearance defect rate of the ultraviolet light curing ink layer 32 formed on the surface to be insulated 31 is reduced. On the other hand, the surface to be insulated 31 has a certain roughness and surface energy, thereby improving the adhesion between the surface to be insulated 31 and the ultraviolet light curing ink layer 32.

[0196] According to some embodiments of the present application, the cleaning device 11 may include a laser cleaning component 111 or a plasma cleaning component 112. The laser cleaning component 111 may perform laser cleaning on the surface to be insulated 31; the plasma cleaning component 112 may perform plasma cleaning on the surface to be insulated 31, so that the surface to be insulated 31 meets the cleaning requirements.

[0197] 6 and 7 , according to some embodiments of the present application, the battery cell surface insulation device 100 further includes: a first detection component 16 for detecting the thickness of the UV-curable ink layer 32 ; and / or a second detection component 17 for detecting the pressure resistance performance of the UV-curable ink layer 32 .

[0198] For example, the battery cell surface insulation device 100 may further include a first detection component 16 . Alternatively, the battery cell surface insulation device 100 may further include a first detection component 16 and a second detection component 17 . Alternatively, the battery cell surface insulation device 100 may further include a second detection component 17 .

[0199] The first detection component 16 and the second detection component 17 are disposed downstream of the curing device 13 to detect the cured UV-curable ink layer 32 .

[0200] The first detection component 16 is a component for detecting the thickness of the UV-curable ink layer 32 . For example, the first detection component 16 can be a magnetic induction or eddy current film thickness tester.

[0201] The second detection component 17 is a component for detecting the pressure resistance of the UV-curable ink layer 32 . For example, the second detection component 17 may be a pressure tester.

[0202] In the above-described solution, the first detection component 16 detects the thickness of the UV-curable ink layer 32, enabling timely detection of UV-curable ink layers 32 that exceed a preset thickness range. This allows the inkjet printing parameters to be adjusted to bring the thickness of the UV-curable ink layer 32 within the preset range, thereby ensuring greater thickness consistency in the UV-curable ink layer 32. The second detection component 17 detects the pressure resistance of the UV-curable ink layer 32, enabling detection of defects in the UV-curable ink layer 32, such as cavities, foreign matter, and coating gaps, allowing for the removal of substandard products, ensuring higher quality of insulated products and facilitating subsequent processing.

[0203] Please refer to Figures 6 and 7. According to some embodiments of the present application, the battery cell surface insulation device 100 also includes a light shield 18. The light shield 18 is arranged between the inkjet printing device 12 and the first ultraviolet light irradiation lamp 131. The light shield 18 is used to block the ultraviolet light of the first light intensity emitted by the first ultraviolet light irradiation lamp 131 to reduce the impact of the ultraviolet light of the first light intensity on the ink in the inkjet printing device 12.

[0204] Please refer to FIG8 , which shows a schematic flow chart of a battery cell surface insulation method provided by some embodiments of the present application. According to some embodiments of the present application, the present application provides a battery cell surface insulation method 200 , which includes:

[0205] 201, a loading process, wherein the battery cells 300 to be insulated are conveyed to a conveyor belt;

[0206] The battery cells 300 to be insulated are conveyed to a cleaning station via a conveyor belt;

[0207] 210, cleaning process, laser cleaning and plasma cleaning are performed on the surface to be insulated 31 of the battery cell 300, so that the roughness Rz of the surface to be insulated 31 meets the following requirements: 5 μm ≤ Rz ≤ 20 μm, glossiness ≤ 100 GU at 60°, and surface tension ≥ 50 dyn / cm;

[0208] The cleaned battery cells 300 are transported to the inkjet printing station;

[0209] 220, inkjet printing process, spraying ultraviolet curing ink on the surface to be insulated 31 by the inkjet printing device 12 to form an ultraviolet curing ink layer 32, the thickness of the ultraviolet curing ink layer 32 is 100±10μm;

[0210] The battery cell 300 formed with the UV curable ink layer 32 is transported to a pre-curing station;

[0211] 231, pre-curing process, irradiating the UV curable ink layer 32 with UV light of a first light intensity to pre-curing the UV curable ink layer 32, wherein the duration of irradiating the UV curable ink layer 32 with UV light of the first light intensity is 0.2s, and the first light intensity is 120mW / cm 2 The energy of the first intensity of ultraviolet light is 15mJ / cm 2 ;

[0212] 232, final curing step, irradiating the pre-cured UV-curable ink layer 32 with UV light of a second intensity to finally cure the UV-curable ink layer 32, wherein the UV-curable ink layer 32 is irradiated with the UV light of the second intensity for 0.5s, and the second intensity is 30000mW / cm 2 The energy of the second intensity ultraviolet light is 13000mJ / cm 2 ;

[0213] After the final curing process of the UV-curable ink layer 32 on one surface 31 to be insulated is completed, the battery cell 300 is turned over so that the other surface 31 to be insulated without the UV-curable ink layer 32 is placed away from the conveyor belt;

[0214] Repeat the inkjet printing process, the pre-curing process, and the final curing process until a UV-curable ink layer 32 is formed on all surfaces to be insulated 31 and the UV-curable ink layer 32 is cured, thereby completing the surface insulation treatment of the battery cell 300.

[0215] 240, detecting the thickness of the UV-curable ink layer 32;

[0216] 250, performing a pressure resistance test on the UV curable ink layer 32;

[0217] 260, unloading process, the battery cells 300 that have completed the insulation treatment are transported to the subsequent stations.

[0218] Among them, after flipping the battery cell 300, when the battery cell 300 is moved to the inkjet printing station, the other surface to be insulated 31 on which the UV-curable ink layer 32 is not formed can face the nozzle of the inkjet printing device 12, so that the UV-curable ink sprayed by the inkjet printing device 12 can be sprayed onto the surface to be insulated 31.

[0219] Among them, the speed of the conveyor belt is 6m / min.

[0220] Among them, the order of step "240, detecting the thickness of the UV-curable ink layer 32" and step "250, performing a pressure resistance test on the UV-curable ink layer 32" can be adjusted and is not unique; for example, step "250, performing a pressure resistance test on the UV-curable ink layer 32" can be performed first, and then step "240, detecting the thickness of the UV-curable ink layer 32" can be performed.

[0221] According to some embodiments of the present application, the embodiments of the present application also provide another method for insulating the surface of a battery cell. The difference from the above method is that after the pre-curing process is completed, the battery cell 300 can be flipped over, and then, another surface 31 to be insulated is facing the nozzle of the inkjet printing device 12, and the inkjet printing process and the pre-curing process are performed on the surface 31 to be insulated, so that a UV-curable ink layer 32 is formed on multiple surfaces 31 to be insulated of the battery cell 300 and is pre-cured. After the UV-curable ink layer 32 on all surfaces 31 to be insulated is completed, the curing process is performed.

[0222] Those skilled in the art will understand that, in the above-mentioned method of a specific embodiment, the writing order of each step does not mean a strict execution order and does not constitute any limitation on the implementation process. The specific execution order of each step should be determined by its function and possible internal logic.

[0223] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be substituted with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

Claims

1. A method for insulating the surface of a battery cell, It is characterized in that include: A cleaning process is to clean the surface of the battery cell to be insulated; Inkjet printing process, forming a UV-curable ink layer on the surface to be insulated by inkjet printing method; The curing step is to irradiate the UV curable ink layer with UV light to cure it.

2. The battery cell surface insulation method according to claim 1, It is characterized in that The curing process comprises: A pre-curing step, irradiating the UV-curable ink layer with UV light of a first light intensity to pre-cure the UV-curable ink layer; A final curing step, irradiating the pre-cured UV-curable ink layer with UV light of a second light intensity to final cure it; Wherein, the first light intensity is smaller than the second light intensity.

3. The battery cell surface insulation method according to claim 2, It is characterized in that After completing the final curing process of the UV-curable ink layer on one surface to be insulated, the battery cell is turned over, and the inkjet printing process, the pre-curing process and the final curing process are repeated to form UV-curable ink layers on multiple surfaces to be insulated of the battery cell and final cure them.

4. The battery cell surface insulation method according to claim 2, It is characterized in that Before the final curing process, the battery cell is turned over, and the inkjet printing process and the pre-curing process are repeated to form a UV-curable ink layer on a plurality of surfaces to be insulated of the battery cell and pre-cure it.

5. The battery cell surface insulation method according to any one of claims 2 to 4, It is characterized in that The first light intensity is Q1, and the second light intensity is Q2, satisfying 240≤Q2 / Q1≤260.

6. The battery cell surface insulation method according to any one of claims 2 to 5, It is characterized in that The irradiation time of the ultraviolet light of the first light intensity on the ultraviolet light curable ink layer is T1, and the irradiation time of the ultraviolet light of the second light intensity on the ultraviolet light curable ink layer is T2, which satisfies 2.2≤T2 / T1≤2.

8.

7. The battery cell surface insulation method according to any one of claims 1 to 6, It is characterized in that In the curing process, the distance between the ultraviolet light source and the ultraviolet curing ink layer is 3 mm to 20 mm.

8. The battery cell surface insulation method according to any one of claims 1 to 7, It is characterized in that The cleaning process comprises: Performing laser cleaning on the surface of the battery cell to be insulated; and / or, Plasma cleaning is performed on the surface of the battery cell to be insulated.

9. The battery cell surface insulation method according to any one of claims 1 to 8, It is characterized in that In the inkjet printing process, an ultraviolet curable ink layer is formed on the surface to be insulated by an inkjet printing device, and the distance between the nozzle of the inkjet printing device and the surface to be insulated is 1 mm to 6 mm.

10. The battery cell surface insulation method according to any one of claims 1 to 9, It is characterized in that After the curing process, the battery cell surface insulation method further includes: Detecting the thickness of the UV-curable ink layer; and / or The UV-curable ink layer is subjected to a pressure resistance test.

11. A battery cell surface insulation device, It is characterized in that include: A cleaning device, used for cleaning the surface of the battery cell to be insulated; An inkjet printing device for forming a UV-curable ink layer on the surface to be insulated; The curing device is used for irradiating the UV curable ink layer with UV light to cure it.

12. The battery cell surface insulation device according to claim 11, It is characterized in that The curing device comprises a first ultraviolet light irradiation lamp and a second ultraviolet light irradiation lamp, and the light intensity of the ultraviolet light emitted by the second ultraviolet light irradiation lamp is greater than the light intensity of the ultraviolet light emitted by the first ultraviolet light irradiation lamp.

13. The battery cell surface insulation device according to claim 12, It is characterized in that The first ultraviolet light irradiation lamp includes an LED lamp, and the second ultraviolet light irradiation lamp includes an electrodeless lamp or a mercury lamp.

14. The battery cell surface insulation device according to any one of claims 11 to 13, It is characterized in that The battery cell surface insulation device also includes: The flipping device is used for flipping the battery cell so that the multiple surfaces to be insulated of the battery cell can be selectively oriented toward the nozzle of the inkjet printing device.

15. The battery cell surface insulation device according to any one of claims 11 to 14, It is characterized in that The battery cell surface insulation device also includes: The conveying device is used to convey the battery monomer so that the battery monomer passes through the cleaning device, the inkjet printing device and the curing device in sequence.

16. The battery cell surface insulation device according to any one of claims 11 to 15, It is characterized in that The cleaning device comprises a laser cleaning component and a plasma cleaning component. The laser cleaning component is used to perform laser cleaning on the surface to be insulated, and the plasma cleaning component is used to perform plasma cleaning on the surface to be insulated.

17. The battery cell surface insulation device according to any one of claims 11 to 16, It is characterized in that The battery cell surface insulation device also includes: A first detection component, used to detect the thickness of the UV-curable ink layer; and / or The second detection component is used to detect the pressure resistance performance of the ultraviolet light curing ink layer.

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