A lithium-ion battery separator coating apparatus and method of use

Abstract

The application discloses a kind of lithium ion battery separator coating device and use method, including substrate and be set on substrate preheating box, impurity removal component, extrusion die, drying component and winding component;Guiding roller group is provided on substrate;Impurity removal component includes rotating sleeve and fixed sleeve;Rotating sleeve is rotatably installed on substrate, and outer wall has a plurality of annularly arranged adsorption cavities;Fixed sleeve is embedded in the inside of rotating sleeve, and can be kept fixed relative to rotating sleeve;One end of fixed sleeve is connected with external vacuum negative pressure equipment through support pipeline, and the outer wall of fixed sleeve is provided with arc opening;A plurality of adsorption cavities are intermittently communicated with arc opening.The application relates to the technical field of battery separator, by the above setting, realize the surface impurity of separator to be removed quickly, also without additional components to clean the impurities in impurity removal component function, effectively shorten the time required for impurity removal, and correspondingly reach the purpose of convenient operation and simple structure.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of lithium ion batteries, and relates to a lithium ion battery separator technology, in particular to a lithium ion battery separator coating device and a use method. BACKGROUND

[0002] Lithium ion batteries have been widely used in new energy fields such as electric vehicles and large-scale energy storage systems due to their high energy density and long cycle life. With the rapid development of these applications, more stringent standards are required for the performance and production efficiency of one of the key components of lithium ion batteries, namely the separator. As an insulating layer inside the battery, the quality of the separator directly affects the safety performance and electrochemical performance of the battery.

[0003] In the manufacturing process of lithium ion battery separators, the coating process is a key step that determines the quality of the separator. The coating process involves uniformly coating the separator material on the separator to form a coating layer with a certain thickness and uniformity. This process not only affects the microstructure and porosity of the separator, but also directly relates to the charge-discharge performance and cycle stability of the battery.

[0004] In the prior art, the manufacturing of battery separators is completed by using a guide roller set, so that the separator passes through a pre-baking oven, a coating mechanism, and a winding mechanism in sequence to complete the coating function. However, in actual production, there are certain technical problems: for example, when the separator is transported from the pre-baking oven to the coating mechanism, the surface of the separator is easily attached to impurities in the air due to softening, and if the impurities are not cleaned in time, it will cause the coated separator to be contaminated and cause battery failure or performance degradation. Regarding this technical problem, the existing Chinese patent CN117225640A proposes a lithium ion battery separator coating method and coating equipment, which sets a first scraper and a second scraper on the upper and lower surfaces of the separator, respectively, and completes the removal of impurities by the relative force between the first scraper and the second scraper when the separator is fed. Then, other scrapers and link components are used to clean the impurities on the first scraper and the second scraper. The required steps are more, the efficiency is relatively low, and the required structure is relatively complex, which is difficult to popularize and apply.

[0005] Therefore, a lithium ion battery separator coating device and a use method are needed to quickly remove impurities from the surface of the separator, and to enable the impurities in the impurity removal assembly to fall into the specified area automatically, i.e. without the need to add additional components to clean the impurities contained in the impurity removal assembly, to achieve the purpose of easy operation and simple structure. SUMMARY

[0006] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a lithium-ion battery separator coating device and method of use, which can quickly remove impurities from the separator surface and allow impurities within the impurity removal component to fall autonomously into a designated area, eliminating the need for additional components to clean the impurities contained within the impurity removal component, thus achieving convenient operation and a simple structure. This invention sets up an impurity removal component including a rotating sleeve and a fixed sleeve, with one end of the fixed sleeve connected to an external vacuum negative pressure device and an arc-shaped opening on its outer wall. Multiple adsorption chambers communicating with the arc-shaped opening are set outside the rotating sleeve. Therefore, when the rotating sleeve rotates, each adsorption chamber can communicate with the arc-shaped opening at a specific position, thereby completing the adsorption and removal of impurities from the separator surface. When the adsorption chamber disconnects from the arc-shaped opening, the impurities can also fall to the designated area under the rotational force and their own gravity. This achieves the function of quickly removing impurities from the separator surface without the need for additional components to clean the impurities within the impurity removal component, effectively shortening the time required for impurity removal and achieving the goals of convenient operation and a simple structure.

[0007] To achieve the above objectives, a first aspect of the present invention provides a lithium-ion battery separator coating apparatus, comprising a substrate and a preheating box, a cleaning assembly, an extrusion die, a drying assembly, and a winding assembly sequentially disposed on the substrate from the separator conveying direction.

[0008] The substrate is provided with a set of guide rollers for guiding the diaphragm through the preheating box, the impurity removal component, the extrusion die, and the drying component;

[0009] The impurity removal assembly includes a rotating sleeve and a fixed sleeve;

[0010] The rotating sleeve is rotatably mounted on the substrate, and its outer wall has multiple adsorption cavities arranged in a ring shape;

[0011] The fixed sleeve is embedded inside the rotating sleeve and can remain fixed relative to the rotating sleeve;

[0012] One end of the fixed sleeve is connected to an external vacuum negative pressure device through a support pipe, and the outer wall of the fixed sleeve has an arc-shaped opening;

[0013] The adsorption cavities are intermittently connected to the arc-shaped opening.

[0014] Furthermore, the impurity removal component also includes an impurity recovery box;

[0015] The impurity recovery box is fixedly installed on the substrate and located on the side of the fixing sleeve away from the arc-shaped opening, so that when the adsorption chamber is separated from the arc-shaped opening, the impurities located in the adsorption chamber can enter the impurity recovery box.

[0016] Further, the adsorption cavity is arranged in a trapezoidal structure and communicates with the arc-shaped opening through a communication hole to form an inclined surface, so that impurities can be discharged to the impurity recovery box along the inclined surface when the impurities are not subjected to adsorption force.

[0017] Further, a filter screen is arranged in the communication hole.

[0018] Further, the central angle corresponding to the arc-shaped opening is 240°-300°.

[0019] Further, the winding assembly and the rotating sleeve are connected through a synchronous belt transmission.

[0020] Further, a tensioning roller and a tension force detection sensor are arranged between the winding assembly and the drying assembly.

[0021] The tensioning roller is slidably installed on the base plate in a vertical direction by an electric telescopic rod, and the lower surface is in abutment with the diaphragm surface.

[0022] The tension force detection sensor is arranged on the base plate and is used for detecting the tension of the diaphragm, and is connected to the same control system as the electric telescopic rod.

[0023] Further, the drying assembly comprises a preheating cavity, a drying cavity and a cooling cavity arranged in sequence from the input direction of the diaphragm, for preheating, drying and cooling of the diaphragm, respectively.

[0024] Further, the preheating cavity is internally provided with a heating resistance wire.

[0025] The drying cavity is internally provided with a hot air circulation system.

[0026] The cooling cavity is internally provided with a cooling water circulation system.

[0027] In another aspect, the present application also provides a use method of the lithium ion battery diaphragm coating device, which adopts the lithium ion battery diaphragm coating device described in the above embodiments, and specifically comprises the following steps:

[0028] The diaphragm passes through the preheating box, the impurity removal assembly, the extrusion die and the drying assembly in sequence through the guide roller group, and is connected with the winding assembly.

[0029] The adsorption cavity, which is connected with the arc-shaped opening through the rotating sleeve, is opposite to the diaphragm surface.

[0030] The winding assembly is controlled to rotate to drive the diaphragm to feed, and the rotating sleeve is driven to rotate relative to the fixed sleeve, so that the plurality of adsorption cavities alternately adsorb the surface of the diaphragm to complete the adsorption and impurity removal of the diaphragm surface.

[0031] The separator after the surface impurity removal is coated by an extrusion die;

[0032] The coated separator is dried by a drying assembly, and is wound up.

[0033] Compared with the prior art, the present application has the following advantages:

[0034] By setting the impurity removal assembly including the rotating sleeve and the fixed sleeve, and connecting one end of the fixed sleeve to the external vacuum negative pressure device and opening the arc-shaped opening on the outer wall, and forming a plurality of annularly arranged and arc-shaped opening communicated adsorption cavities on the outer wall of the rotating sleeve, when the adsorption cavities are communicated with the arc-shaped opening, an adsorption force can be applied to the outside, so that the impurities on the surface of the separator are adsorbed and removed, and when the adsorption cavities are switched to separate from the arc-shaped opening by following the rotation of the rotating sleeve, the internal impurities are no longer subjected to the adsorption force, and will be separated from the adsorption cavities under the action of centrifugal force and gravity, and then fall to the designated position, thereby realizing the rapid removal of the impurities on the surface of the separator, and the impurities in the impurity removal assembly can be cleaned without additional components, effectively shortening the time required for impurity removal, and achieving the purposes of convenient operation and simple structure. BRIEF DESCRIPTION OF DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0036] Figure 1 The structure diagram of the lithium ion battery separator coating device in an embodiment of the present application;

[0037] Figure 2 The partial structure diagram of the impurity removal assembly of the lithium ion battery separator coating device in an embodiment of the present application;

[0038] Figure 3 The structure diagram of the combination of the rotating sleeve and the fixed sleeve of the lithium ion battery separator coating device in an embodiment of the present application;

[0039] Figure 4 The structure diagram of the fixed sleeve of the lithium ion battery separator coating device in an embodiment of the present application;

[0040] Figure 5 The flow chart of the use method of the lithium ion battery separator coating device in another embodiment of the present application.

[0041] REFERENCE NUMERALS:

[0042] 1, substrate; 2, preheating box; 3, impurity removal assembly; 31, rotating sleeve; 311, adsorption cavity; 312, communication hole; 32, fixed sleeve; 321, support pipeline; 322, arc-shaped opening; 33, impurity recovery box; 4, extrusion die; 5, drying assembly; 51, preheating cavity; 52, drying cavity; 53, cooling cavity; 6, winding assembly; 7, guide roller set; 8, tensioning roller; 9, tension detection sensor. DETAILED DESCRIPTION

[0043] The technical solutions of the present application will be described clearly and completely below in conjunction with the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0044] Embodiment one

[0045] Please refer to Figures 1 to 4 As shown in the figure, the first aspect of the present application provides a kind of lithium ion battery separator coating device, including substrate 1 and preheating box 2, impurity removal assembly 3, extrusion die 4, drying assembly 5 and winding assembly 6 which are sequentially arranged on substrate 1 from the direction of separator conveying.

[0046] The substrate 1 is provided with guide roller set 7 for guiding the separator to pass through the preheating box 2, the impurity removal assembly 3, the extrusion die 4 and the drying assembly 5, so that the separator sequentially experiences preheating, impurity removal, coating, drying and winding operations, facilitating subsequent processing.

[0047] In this embodiment, the impurity removal assembly 3 includes rotating sleeve 31 and fixed sleeve 32.

[0048] The rotating sleeve 31 is rotatably mounted on the substrate 1, and the outer wall has a plurality of annularly arranged adsorption cavities 311 for adsorbing and removing impurities on the surface of the separator by negative pressure adsorption.

[0049] In addition, the fixed sleeve 32 is embedded in the interior of the rotating sleeve 31 and can be fixed relative to the rotating sleeve 31, i.e. the rotating connection between the fixed sleeve 32 and the rotating sleeve 31, the rotating sleeve 31 does not drive the fixed sleeve 32 to rotate when driving the adsorption cavity 311 to rotate.

[0050] One end of the fixed sleeve 32 is connected with the external vacuum negative pressure equipment through a supporting pipe 321, and an arc-shaped opening 322 is formed on the outer wall of the fixed sleeve 32, and a plurality of the adsorption cavities 311 are intermittently communicated with the arc-shaped opening 322. Therefore, when the adsorption cavity 311 of the rotating sleeve 31 is rotated to be communicated with the arc-shaped opening 322, an adsorption force is formed at the adsorption cavity 311 to adsorb and remove the impurities on the diaphragm. Correspondingly, when the adsorption cavity 311 of the rotating sleeve 31 contains impurities and is rotated to be separated from the arc-shaped opening 322, the impurities in the adsorption cavity 311 are no longer subjected to the adsorption force, so that the impurities can fall to a designated position under the centrifugal force and gravity, thereby completing the cleaning of the impurities in the adsorption cavity 311 and avoiding affecting the subsequent cycle adsorption.

[0051] It should be noted that the supporting pipe 321 can provide a supporting force to the fixed sleeve 32 to ensure that the fixed sleeve 32 is fixedly embedded in the inside of the rotating sleeve 31, and the rotating sleeve 31 can rotate relative to the fixed sleeve 32.

[0052] The device is provided with the impurity removal assembly 3 including the rotating sleeve 31 and the fixed sleeve 32, one end of the fixed sleeve 32 is connected with the external vacuum negative pressure equipment, and the arc-shaped opening 322 is formed on the outer wall of the fixed sleeve 32, and a plurality of the adsorption cavities 311 are formed on the outer wall of the rotating sleeve 31 and communicated with the arc-shaped opening 322, so that when the adsorption cavity 311 is communicated with the arc-shaped opening 322, an adsorption force can be applied to the outside to remove the impurities on the diaphragm surface, and when the adsorption cavity 311 is separated from the arc-shaped opening 322 by rotating the rotating sleeve 31, the impurities in the adsorption cavity 311 are no longer subjected to the adsorption force and fall to a designated position under the centrifugal force and gravity, thereby realizing the rapid removal of the impurities on the diaphragm surface and the cleaning of the impurities in the impurity removal assembly 3 without additional components, effectively shortening the time required for impurity removal, and achieving the purposes of convenient operation and simple structure.

[0053] In further embodiments, in order to facilitate the recycling of impurities and avoid interference between the impurity falling position and the diaphragm, the impurity removal assembly 3 further includes an impurity recycling box 33.

[0054] The impurity recycling box 33 is fixedly installed on the base plate 1 and located on the side of the fixed sleeve 32 away from the arc-shaped opening 322, so that when the adsorption cavity 311 is separated from the arc-shaped opening 322, the impurities in the adsorption cavity 311 can enter the impurity recycling box 33.

[0055] It should be noted that the adsorption cavity 311 is arranged in a trapezoidal structure, and is communicated with the arc-shaped opening 322 through the communication hole 312 to form an inclined surface, so that the impurities can be discharged to the impurity recovery box 33 along the inclined surface when the adsorption force is not affected, that is, the discharge rate of the impurities is accelerated, and the discharge effect is improved.

[0056] In order to prevent the communication hole 312 from being blocked, a filter screen is arranged in the communication hole 312.

[0057] The central angle corresponding to the arc-shaped opening 322 is 240°-300°, so as to increase the arc-shaped track in the communication state of the arc-shaped opening 322 and the adsorption cavity 311, thereby ensuring that the adsorption cavity 311 is separated from the impurities only after moving to a specific position, and ensuring that the impurities will not be re-adhered to the diaphragm due to external factors.

[0058] In other embodiments, the winding assembly 6 and the rotating sleeve 31 are connected through a synchronous belt transmission, so that the winding assembly 6 and the rotating sleeve 31 operate synchronously, that is, when the winding assembly 6 pulls the diaphragm to feed, the rotating sleeve 31 replaces different adsorption cavities 311 to adsorb and remove the impurities of the new diaphragm area, thereby improving the removal effect of the impurities.

[0059] It should be noted that the winding assembly 6 is driven by a motor, and the motor is a stepping motor, so as to intermittently convey the diaphragm, thereby reserving a certain time for the adsorption cavity 311 to adsorb and remove the impurities.

[0060] In other embodiments, in order to ensure the winding effect, a tensioning roller 8 and a tension detection sensor 9 are arranged between the winding assembly 6 and the drying assembly 5.

[0061] The tensioning roller 8 is slidably installed on the base plate 1 in the vertical direction through an electric telescopic rod, and the lower surface is in abutment with the surface of the diaphragm.

[0062] The tension detection sensor 9 is arranged on the base plate 1, and is used to detect the tension of the diaphragm, and is connected to the same control system as the electric telescopic rod. When the tension detection sensor 9 detects that the tension is too large, the electric telescopic rod can be controlled to retract to adjust the tension of the diaphragm, thereby improving the stability of the equipment operation.

[0063] In further embodiments, the drying assembly 5 includes a preheating cavity 51, a drying cavity 52 and a cooling cavity 53 arranged in sequence from the input direction of the diaphragm, which are respectively used for preheating, drying and cooling of the diaphragm, so as to accelerate the drying process and ensure that the solvent in the coating liquid evaporates quickly through preheating and drying, thereby avoiding affecting the molding quality due to insufficient drying of the solvent, and preparing for subsequent winding through cooling.

[0064] The preheating chamber 51 is equipped with a heating resistance wire, the drying chamber 52 is equipped with a hot air circulation system, and the cooling chamber 53 is equipped with a cooling water circulation system.

[0065] It should be noted that the heating resistance wire, hot air circulation system, and cooling water circulation system are all conventional technologies in the prior art, so they will not be described in detail here.

[0066] Example 2

[0067] like Figure 5 As shown, this embodiment, based on Embodiment 1, also proposes a method for using the lithium-ion battery separator coating device. The method employs the lithium-ion battery separator coating device described in Embodiment 1 and specifically includes the following steps:

[0068] The diaphragm is passed sequentially through the preheating box 2, the impurity removal component 3, the extrusion die 4 and the drying component 5 via the guide roller group 7, and is connected to the winding component 6;

[0069] The adsorption cavity 311, which connects the rotating sleeve 31 to the arc-shaped opening 322, is directly opposite the diaphragm surface.

[0070] The winding assembly 6 is controlled to rotate, thereby driving the diaphragm to feed while simultaneously driving the rotating sleeve 31 to rotate relative to the fixed sleeve 32. Multiple adsorption chambers 311 alternately adsorb the surface of the diaphragm, thus completing the adsorption and removal of impurities from the diaphragm surface.

[0071] The diaphragm after surface impurity removal is coated using the extrusion die 4;

[0072] The coated diaphragm is dried by the drying component 5 and then wound up.

[0073] Through the above steps, the relative positional relationship between the rotating sleeve 31 and the fixed sleeve 32 (i.e., the connection or disconnection of the adsorption chamber 311 and the arc-shaped opening 322) can be effectively utilized to complete the rapid adsorption and removal of diaphragm impurities and the rapid cleaning of impurities after removal, effectively shortening the time required for impurity removal and achieving the purpose of convenient operation and simple structure.

[0074] The above embodiments are only used to illustrate the technical methods of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical methods of the present invention without departing from the spirit and scope of the technical methods of the present invention.

Claims

1. A lithium ion battery separator coating apparatus characterized by, The device comprises a base plate (1), a preheating box (2), a foreign matter removing assembly (3), an extrusion die (4), a drying assembly (5) and a winding assembly (6) arranged on the base plate (1) in sequence from the conveying direction of the diaphragm; A guide roller set (7) is arranged on the base plate (1) for guiding the diaphragm to pass through the preheating box (2), the foreign matter removing assembly (3), the extrusion die (4) and the drying assembly (5); The foreign matter removing assembly (3) comprises a rotating sleeve (31) and a fixed sleeve (32); The rotating sleeve (31) is rotatably installed on the base plate (1) and has a plurality of adsorption cavities (311) arranged in a ring shape on the outer wall; The fixed sleeve (32) is embedded in the interior of the rotating sleeve (31) and can be fixed relative to the rotating sleeve (31); One end of the fixed sleeve (32) is connected with an external vacuum negative pressure device through a support pipeline (321), and an arc-shaped opening (322) is formed on the outer wall of the fixed sleeve (32); A plurality of the adsorption cavities (311) are intermittently communicated with the arc-shaped opening (322); The adsorption cavities (311) are arranged in a trapezoidal structure and are communicated with the arc-shaped opening (322) through a communication hole (312) to form an inclined surface, so that the foreign matter can be discharged along the inclined surface when not subjected to the adsorption force; A filter screen is arranged in the communication hole (312); The central angle corresponding to the arc-shaped opening (322) is 240°-300°.

2. The lithium-ion battery separator coating apparatus of claim 1, wherein, The foreign matter removing assembly (3) further comprises a foreign matter recycling box (33); The foreign matter recycling box (33) is fixedly installed on the base plate (1) and located on the side of the fixed sleeve (32) away from the arc-shaped opening (322), so that when the adsorption cavities (311) are separated from the arc-shaped opening (322), the foreign matter in the adsorption cavities (311) can enter the foreign matter recycling box (33).

3. The lithium-ion battery separator coating apparatus of claim 1, wherein, The winding assembly (6) and the rotating sleeve (31) are connected through a synchronous belt transmission.

4. The lithium-ion battery separator coating apparatus of claim 1, wherein, A tensioning roller (8) and a tension force detection sensor (9) are arranged between the winding assembly (6) and the drying assembly (5); The tensioning roller (8) is slidably installed on the base plate (1) in the vertical direction through an electric telescopic rod, and the lower surface abuts against the surface of the diaphragm; The tension force detection sensor (9) is arranged on the base plate (1) and used for detecting the tension of the diaphragm, and connected with the same control system as the electric telescopic rod.

5. The lithium-ion battery separator coating apparatus of claim 1, wherein, The drying assembly (5) comprises a preheating cavity (51), a drying cavity (52) and a cooling cavity (53) arranged in sequence from the input direction of the diaphragm, for preheating, drying and cooling of the diaphragm, respectively.

6. The lithium-ion battery separator coating apparatus of claim 5, wherein, The preheating cavity (51) is internally provided with a heating resistance wire; The drying cavity (52) is internally provided with a hot air circulation system; The cooling cavity (53) is internally provided with a cooling water circulation system.

7. A method of using a lithium-ion battery separator coating apparatus, characterized by, The device is used for coating a lithium ion battery diaphragm. The diaphragm passes through the preheating box (2), the impurity removal assembly (3), the extrusion die (4) and the drying assembly (5) in sequence through the guide roller set (7) and is connected with the winding assembly (6); The rotating sleeve (31) is connected with the adsorption cavity (311) of the arc-shaped opening (322) and is opposite to the diaphragm surface; The rotating sleeve (31) is driven to rotate relative to the fixed sleeve (32) by controlling the rotation of the winding assembly (6) to drive the diaphragm feeding, and the plurality of adsorption cavities (311) alternately adsorb the surface of the diaphragm to complete the adsorption and impurity removal of the diaphragm surface; The diaphragm after the surface impurity removal is coated through the extrusion die (4); The coated diaphragm is dried through the drying assembly (5) and is wound.

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