A kind of oil removing device for lithium battery separator
Patent Information
- Application Number
- CN202522618032.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-10
- Publication Date
- 2026-10-30
- Estimated Expiration
- 2035-12-10
AI Technical Summary
首先，各槽体溶液状态相对独立，无法在系统内自然形成浓度梯度，实践中，为保证最终除油效果，往往需要频繁更换或大量补充各槽溶液，导致新鲜萃取溶剂消耗量大，废液产生量多，运行成本高昂；其次，隔膜从一个槽体引出并进入下一个槽体时，其表面会附着并携带大量前一道槽体的工作液，这会导致含油浓度较高的溶液不断污染下游浓度较低的溶液，即“交叉污染”，这种现象严重削弱了后续槽体的有效萃取能力，迫使所有槽体溶液加速劣化，为维持质量不得不更频繁地整体换液，进一步加剧了成本与环保压力
本实用新型的除油箱沿阶梯状均匀分布，隔膜由最低端除油箱进入，由低至高依次浸没通过各级除油箱，最终从最高端排出，通过配套的导流管，可使萃取溶液的流动方向与隔膜行进方向相反，即新鲜的或浓度较低的萃取溶液从最高端补充，并逐步向低端流动，而饱和度高的萃取溶液从最低端排出，该设计在保证最终除油质量的前提下，最大限度地利用了萃取溶液的萃取能力，显著减少了新鲜溶液的消耗和废液的产生量，降低了生产成本和环保压力。
Smart Images
Figure CN224911812U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of lithium battery separator production equipment, and in particular relates to an oil removal device for lithium battery separators. Background Technology
[0002] As a key internal component of lithium-ion batteries, the purity of the lithium battery separator directly affects the battery's ionic conductivity, safety performance, and cycle life. In the wet process of separator production, a large amount of mineral oil and paraffin oil are used as pore-forming agents. These oils must be completely removed in subsequent processes. Therefore, the "oil removal device for lithium battery separators" is a key piece of equipment on the wet process separator production line used to extract and remove the oil contained in the separator. Its efficiency directly determines the final quality and production cost of the separator.
[0003] Currently, the oil removal devices commonly used in the industry mostly adopt a layout of multiple oil removal tanks arranged in parallel. This scheme usually arranges multiple tanks containing extraction solutions (such as dichloromethane, heptane, etc.) side by side. The diaphragm is immersed in each tank in a horizontal or near-horizontal path in sequence. The solution in each tank is circulated or replenished independently to complete multiple extraction and cleaning of the diaphragm.
[0004] However, this existing structure has the following drawbacks in practical use: First, the solutions in each tank are relatively independent and cannot naturally form a concentration gradient within the system. In practice, to ensure the final oil removal effect, it is often necessary to frequently replace or replenish the solutions in each tank, resulting in a large consumption of fresh extraction solvent, a large amount of waste liquid, and high operating costs. Second, when the diaphragm is led out of one tank and into the next, its surface will be covered with a large amount of working liquid from the previous tank. This will cause the solution with a higher oil concentration to continuously contaminate the solution with a lower concentration downstream, i.e., "cross-contamination". This phenomenon seriously weakens the effective extraction capacity of subsequent tanks, forcing all tank solutions to deteriorate faster. In order to maintain quality, it is necessary to replace the entire solution more frequently, further aggravating cost and environmental pressure.
[0005] Therefore, it is essential to invent an oil removal device for lithium battery separators. Utility Model Content
[0006] To address the above problems, this utility model proposes an oil removal device for lithium battery separators, and the technical solution used is as follows: An oil removal device for lithium battery separators includes a support frame, oil removal tanks, a guide pipe, a drain pipe, a discharge rack, a flow-blocking mechanism, and an air inlet pipe. Several oil removal tanks are bolted to the upper end of the support frame, and these tanks are evenly distributed in a stepped pattern, with adjacent tanks connected by guide pipes. A discharge rack is bolted to the outer side of the highest oil removal tank, and a drain pipe is bolted to the lower end of the lowest oil removal tank. A flow-blocking mechanism is bolted to the upper end of each oil removal tank, with the actuating end of the flow-blocking mechanism facing the corresponding position on the separator, and the air inlet end of each flow-blocking mechanism is fixed to an external air supply mechanism via an air inlet pipe.
[0007] Furthermore, the oil removal tank includes a tank body, a feed shaft, and a guide shaft. The tank body is fixed to the upper end of the support frame at a corresponding position by bolts, and the feed shaft is rotatably mounted on the upper end of the tank body via a support bearing. The guide shaft is rotatably mounted deep inside the tank body via a sealed bearing, and the inside of the tank body is filled with an extraction solution. The lower end of the tank body is connected to an adjacent oil removal tank lower than this tank via a guide pipe, and the upper end of the tank body is connected to an adjacent oil removal tank higher than this tank via a guide pipe. This arrangement can guide the diaphragm and extract the oil on the diaphragm.
[0008] Furthermore, the guide pipe includes a solenoid valve and a liquid guide pipe. One end of the liquid guide pipe is fixed to the lower end of the oil removal tank via a connector, and the other end of the liquid guide pipe is fixed to the upper side of an adjacent oil removal tank that is lower than the aforementioned oil removal tank via a connector. A solenoid valve is fixed in the middle of the liquid guide pipe. The solenoid valve is electrically connected to an external production computer via a data cable. This arrangement allows the extraction solution inside the high-position oil removal tank to enter the adjacent low-position oil removal tank.
[0009] Furthermore, the internal structure of the drain pipe is the same as that of the guide pipe, wherein the end of the drain pipe is fixed to the lower end of the lowest oil removal tank. This arrangement allows the extraction solution inside the lowest oil removal tank to be discharged.
[0010] Furthermore, the flow obstruction mechanism includes a buffer ring, a gas supply pipe, and gas nozzles. The buffer ring is fixed to the upper end of the oil removal tank by bolts, and a diaphragm is movably passed through the middle of the buffer ring. An inner cavity is opened inside the buffer ring, and the end of the buffer ring is fixed to the air inlet pipe through the gas supply pipe. Several gas nozzles are evenly fixed on the side of the buffer ring near the diaphragm, and the spray direction of the gas nozzles is all towards the diaphragm. This arrangement can prevent the extraction solution from affecting the oil removal effect of the next oil removal tank.
[0011] Compared with the prior art, the present invention has the following beneficial effects: The oil removal tanks of this invention are evenly distributed in a stepped pattern. The diaphragm enters from the lowest oil removal tank and is sequentially immersed through each level of the tank, finally exiting from the highest level. Through a matching guide pipe, the flow direction of the extraction solution can be made opposite to the direction of the diaphragm's movement. That is, fresh or low-concentration extraction solution is replenished from the highest level and gradually flows to the lower level, while highly saturated extraction solution is discharged from the lowest level. This design maximizes the extraction capacity of the extraction solution while ensuring the final oil removal quality, significantly reducing the consumption of fresh solution and the amount of waste liquid generated, thus reducing production costs and environmental pressure. The flow-blocking mechanism of this invention sprays airflow onto the diaphragm surface through a gas nozzle, blowing off most of the extraction solution droplets carried on the diaphragm surface and returning them to the original oil removal tank. This design physically prevents the working fluids at each stage from mixing through the diaphragm, avoiding contamination of the relatively clean upstream solution by the downstream oily solution. This ensures that the extraction solution in each stage of the oil removal tank always operates within its designed concentration range, allowing the theoretical advantages of multi-stage extraction to be fully utilized and guaranteeing the consistency and reliability of the oil removal process. Attached Figure Description
[0012] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0013] Figure 1 This is a schematic diagram of the structure of this utility model.
[0014] Figure 2 This is a schematic diagram of the oil removal tank of this utility model.
[0015] Figure 3 This is a schematic diagram of the flow-blocking mechanism of this utility model.
[0016] In the picture: 1-Support frame, 2-Oil removal tank, 21-Box body, 22-Feed shaft, 23-Guide shaft, 3-Guide pipe, 31-Solenoid valve, 32-Liquid guide pipe, 4-Drain pipe, 5-Discharge rack, 6-Flow obstruction mechanism, 61-Buffer ring, 62-Gas delivery pipe, 63-Gas nozzle, 7-Inlet pipe. Detailed Implementation
[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.
[0018] In the description of this utility model, it should be understood that the terms "upper", "middle", "outer", "inner", "around", etc., which indicate orientation or positional relationship, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0019] Please see Figures 1 to 3 As shown, this utility model is an oil removal device for lithium battery separators, including a support frame 1, an oil removal tank 2, a guide pipe 3, a drain pipe 4, a discharge rack 5, a flow obstruction mechanism 6, and an air inlet pipe 7. Several oil removal tanks 2 are fixed to the upper end of the support frame 1 by bolts. The oil removal tanks 2 are evenly distributed in a stepped manner, and adjacent oil removal tanks 2 are connected by guide pipes 3. The outer side of the highest oil removal tank 2 is fixed to the discharge rack 5 by bolts, and the lower end of the lowest oil removal tank 2 is fixed to the drain pipe 4. The upper end of each oil removal tank 2 is fixed to the flow obstruction mechanism 6 by bolts. The actuating end of the flow obstruction mechanism 6 faces the corresponding position of the separator 8, and the air inlet end of the flow obstruction mechanism 6 is fixed to the external air supply mechanism through the air inlet pipe 7.
[0020] Specifically, the oil removal tank 2 includes a tank body 21, a feed shaft 22, and a guide shaft 23. The tank body 21 is fixed to the upper end of the support frame 1 by bolts, and the feed shaft 22 is rotatably mounted on the upper end of the tank body 21 via a support bearing. The guide shaft 23 is rotatably mounted deep inside the tank body 21 via a sealed bearing, and the inside of the tank body 21 is filled with an extraction solution. The lower end of the tank body 21 is connected to the adjacent oil removal tank 2 below it via a guide pipe 3, and the upper end of the tank body 21 is connected to the adjacent oil removal tank 2 above it via a guide pipe 3. With this configuration, during use, the guide shaft 23 and the feed shaft 22 can guide the diaphragm 8 so that the diaphragm 8 passes through the extraction solution inside the tank body 21. During the process of the diaphragm 8 passing through the extraction solution, the extraction solution will extract the oil on the diaphragm 8.
[0021] Specifically, the guide pipe 3 includes a solenoid valve 31 and a liquid guide pipe 32. One end of the liquid guide pipe 32 is fixed to the lower end of the oil removal tank 2 through a connector, and the other end of the liquid guide pipe 32 is fixed to the upper side of the adjacent oil removal tank 2 which is lower than the above-mentioned oil removal tank 2 through a connector. A solenoid valve 31 is fixed in the middle of the liquid guide pipe 32. The solenoid valve 31 is electrically connected to an external production computer through a data cable. With this setting, after a period of use, the extraction solution inside the high-position oil removal tank 2 can be opened by opening the solenoid valve 31 to enter the adjacent low-position oil removal tank 2.
[0022] Specifically, the internal structure of the drain pipe 4 is the same as that of the guide pipe 3. The end of the drain pipe 4 is fixed to the lower end of the lowest oil removal tank 2. With this setting, when the extraction solution inside the lowest oil removal tank 2 reaches saturation (after a period of use), it can be discharged through the drain pipe 4.
[0023] Specifically, the flow obstruction mechanism 6 includes a buffer ring 61, a gas supply pipe 62, and a gas nozzle 63. The buffer ring 61 is fixed to the upper end of the oil removal tank 2 by bolts, and the middle part of the buffer ring 61 moves through the diaphragm 8. The buffer ring 61 has an inner cavity, and the end of the buffer ring 61 is fixed to the air inlet pipe 7 through the gas supply pipe 62. Several gas nozzles 63 are evenly fixed on the side of the buffer ring 61 near the diaphragm 8, and the spray direction of the gas nozzles 63 is all towards the diaphragm 8. With this arrangement, in use, the gas provided by the external gas supply mechanism can be delivered to the gas nozzle 63 through the cooperation of the buffer ring 61, the gas supply pipe 62, and the air inlet pipe 7. Then, the gas is sprayed onto the surface of the diaphragm 8 through the gas nozzle 63, thereby blowing the extraction solution attached to the diaphragm 8 into the oil removal tank 2, thus preventing the extraction solution from affecting the oil removal effect of the next oil removal tank 2.
[0024] Please see Figure 1-3 As shown, this utility model is an oil removal device for lithium battery separators. Its working principle is as follows: When in use, the separator 8 first passes through the lowest oil removal tank 2, then passes through the corresponding oil removal tanks 2 sequentially upwards, and finally is discharged from the highest oil removal tank 2. When the extraction solution inside the lowest oil removal tank 2 is completely saturated (after a period of use), the extraction solution inside the higher oil removal tank 2 is discharged to the lower oil removal tank 2 through the guide pipe 3, and the extraction solution inside the lowest oil removal tank 2 is discharged through the drain pipe 4. Finally, new extraction solution is added to the highest oil removal tank 2. In addition, during the oil removal process of the separator 2, the flow obstruction mechanism 6 can prevent cross-contamination between adjacent oil removal tanks 2.
[0025] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0026] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.
Claims
1. An oil removal device for lithium battery separators, comprising a support frame (1), an oil removal tank (2), a guide pipe (3), a drain pipe (4), a discharge rack (5), a flow obstruction mechanism (6), and an air inlet pipe (7), characterized in that: The upper end of the support frame (1) is fixed with several oil removal boxes (2), wherein the oil removal boxes (2) are evenly distributed in a stepped manner, and adjacent oil removal boxes (2) are connected by a guide pipe (3); the outer side of the highest oil removal box (2) is fixed with a discharge rack (5), and the lower end of the lowest oil removal box (2) is fixed with a drain pipe (4); the upper end of each oil removal box (2) is fixed with a flow blocking mechanism (6), wherein the execution end of the flow blocking mechanism (6) is facing the corresponding position of the diaphragm (8), and the air inlet end of the flow blocking mechanism (6) is fixed to the external air supply mechanism through an air inlet pipe (7).
2. The oil removal device for lithium battery separators as described in claim 1, characterized in that: The oil removal tank (2) includes a tank body (21), a feed shaft (22) and a guide shaft (23). The tank body (21) is fixed at the corresponding position on the upper end of the support frame (1), and the feed shaft (22) is rotatably installed on the upper end of the tank body (21). The guide shaft (23) is rotatably installed deep inside the tank body (21), and the inside of the tank body (21) is filled with an extraction solution. The lower end of the tank body (21) is connected to the adjacent oil removal tank (2) below this oil removal tank (2) through a guide pipe (3), and the upper end of the tank body (21) is connected to the adjacent oil removal tank (2) above this oil removal tank (2) through a guide pipe (3).
3. The oil removal device for lithium battery separators as described in claim 1, characterized in that: The guide pipe (3) includes a solenoid valve (31) and a liquid guide pipe (32). One end of the liquid guide pipe (32) is fixed to the lower end of the oil removal tank (2), and the other end of the liquid guide pipe (32) is fixed to the upper side of the adjacent oil removal tank (2) which is lower than the above-mentioned oil removal tank (2). A solenoid valve (31) is fixed in the middle of the liquid guide pipe (32), and the solenoid valve (31) is electrically connected to an external production computer through a data cable.
4. The oil removal device for lithium battery separators as described in claim 3, characterized in that: The internal structure of the drain pipe (4) is the same as that of the guide pipe (3), wherein the end of the drain pipe (4) is fixed at the lower end of the oil removal tank (2) at the lowest end.
5. The oil removal device for lithium battery separators as described in claim 1, characterized in that: The flow obstruction mechanism (6) includes a buffer ring (61), a gas supply pipe (62), and a gas nozzle (63). The buffer ring (61) is fixed at the upper end of the oil removal tank (2), and the middle part of the buffer ring (61) moves through the diaphragm (8). The buffer ring (61) has an inner cavity, and the end of the buffer ring (61) is fixed to the air inlet pipe (7) through the gas supply pipe (62). Several gas nozzles (63) are evenly fixed on the side of the buffer ring (61) near the diaphragm (8), and the spray direction of the gas nozzles (63) is all towards the diaphragm (8).