Battery separator and method of making the same

Abstract

The application discloses a battery separator impregnation structure and belongs to the field of battery separator production. The battery separator impregnation structure comprises an impregnation box, a temperature control structure is arranged in the impregnation box, an impregnation structure penetrating through the bottom surface of the impregnation box is arranged at the bottom of the impregnation box, a battery separator to be impregnated is arranged in the impregnation structure, the impregnation structure comprises elastic baffles arranged on the two sides of the battery separator, and an impregnation area is formed between the elastic baffles and the battery separator. The impregnation box provides a sealed environment for the impregnation process. The temperature of the impregnation box is not easily affected by the external environment, compared with an open impregnation tank. The temperature control structure can ensure that the temperature is at a required temperature value for impregnation. The battery separator is impregnated in the open impregnation tank in the prior art. The impregnation temperature is difficult to control, the impregnation effect is unstable, and the surface structure of the battery separator is prone to falling off.

Description

Technical Field

[0001] This invention relates to the field of battery separator manufacturing, and in particular to a battery separator impregnation structure. Background Technology

[0002] Currently, with the development of technology, and in order to address the limitations of fossil fuels as a non-renewable energy source, the electric vehicle industry, powered by lead-acid batteries, is experiencing rapid growth. Lead-acid batteries are a technologically mature and safe environmentally friendly type of battery. During the assembly and production process of lead-acid batteries, a separator needs to be sandwiched between the positive and negative plates. Currently, to ensure the reliability of the separator's surface structure, its surface needs to be impregnated with adhesive during the separator's production process.

[0003] For example, the "Production Process of a Fiberglass Separator for a Storage Battery" disclosed in Chinese patent literature, with publication number CN105024031B, includes the following production steps: raw material loosening, slurry preparation and storage, slurry coating and molding, drying, adhesive bonding, plasticizing, appearance inspection, cutting and packaging. The adhesive bonding process involves impregnating the dried fiberglass substrate with a composite latex. This invention uses dilute sulfuric acid to increase the loosening speed and production efficiency; the product has higher bonding strength, and the numerous fine pores on the ribs facilitate electrolyte absorption. However, this invention does not disclose the specific impregnation structure of the separator.

[0004] In the prior art, the partition is impregnated by directly placing it into an open impregnation tank. However, this method makes it difficult to control the temperature of the adhesive solution in the impregnation tank. Once the temperature of the adhesive solution deviates, the impregnation effect will be reduced, which will make the surface structure of the partition easy to fall off. Summary of the Invention

[0005] The present invention aims to overcome the problems in the prior art where the separator is impregnated in an open impregnation tank, making it difficult to control the impregnation temperature and resulting in unstable impregnation effect, which may lead to the easy detachment of the separator surface structure. The invention provides a battery separator impregnation structure that can ensure the stability of the adhesive temperature, thereby ensuring the impregnation effect and preventing unreliable separator surface structure.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] This invention discloses a battery separator impregnation structure, comprising an impregnation tank, a temperature control structure installed inside the impregnation tank, an impregnation structure extending through the bottom of the impregnation tank, a separator to be impregnated being installed inside the impregnation structure, and the impregnation structure including elastic baffles located on both sides of the separator, with an impregnation zone formed between the elastic baffles and the separator.

[0008] The impregnation tank provides a sealed environment for the impregnation process. Compared to the impregnation pool, its temperature is less susceptible to external environmental influences, and the temperature control structure ensures that the temperature remains within the required range. The elastic baffles on both sides of the impregnation structure ensure that the inlet and outlet remain sealed during entry and exit from the impregnation tank, reducing the amount of latex carried out. This reduces the frequency of latex replenishment, improving production efficiency, and prevents excessive latex residue on the baffles, which can lead to uneven surfaces. During impregnation, the elastic baffles expand outwards, increasing the impregnation area and ensuring sufficient contact between the baffles and the latex. Furthermore, the baffles prevent clumps of latex from being fully stirred from the impregnation pool from adhering to the baffles and causing uneven surfaces.

[0009] Preferably, the elastic baffle includes an upper edge and a lower edge, both of which are in contact with the partition. The impregnation area is located between the upper edge and the lower edge. The upper edge and the lower edge of the elastic baffle are in contact with the partition so that when the elastic baffle is squeezed by the inlet and outlet, the gap between the elastic baffle and the partition can be minimized as much as possible, thereby squeezing out excess adhesive from the surface of the partition.

[0010] Preferably, the impregnation structure further includes an impregnation movable seat that moves up and down. The impregnation movable seat includes impregnation windows located on both sides of the partition, and the elastic baffle is located in the impregnation window. The impregnation window can provide space for the outward deformation of the elastic baffle, and at the same time, it can limit the elastic baffle.

[0011] Preferably, the difference between the width of the impregnation window and the width of the elastic baffle does not exceed 5mm; this structure ensures that there will not be too much adhesive residue between the impregnation window and the elastic baffle due to excessive gap, nor will the elastic baffle be difficult to pop outward due to excessive interference.

[0012] Preferably, the upper edge of the elastic baffle is fixedly connected to the upper side of the dipped moving seat, and the lower edge of the elastic baffle is fixedly connected to the lower side of the dipped moving seat; this structure ensures that when the partition is pulled out from the dipped moving seat, there is still space between the elastic baffles on both sides of the partition to facilitate the entry of the next partition.

[0013] Preferably, the impregnation tank is also provided with an impregnation guide seat, and the impregnation guide seat is provided with a guide rail. The impregnation moving seat is installed on the impregnation guide seat. This structure limits the movement of the impregnation moving seat and prevents it from deviating.

[0014] Preferably, the side of the dip-impregnation moving seat facing away from the dip-impregnation guide seat is the partition inlet side. The partition inlet side is provided with a partition inlet and a sealing gasket is installed at the partition inlet. The sealing gasket can prevent the adhesive from leaking out from the partition inlet side.

[0015] Preferably, a stirring device is also installed inside the impregnation tank. The stirring device includes a stirring shaft, a stirring structure mounted on the stirring shaft, and a stirring drive device for driving the stirring shaft. The stirring device can ensure the uniformity of the latex in the impregnation tank and break up the lumps of latex. In addition, in a typical impregnation structure, since the partition moves from top to bottom to the bottom of the latex, if a stirring device is installed, it will interfere with the path of the partition. However, in this application, since the partition enters from the bottom of the impregnation tank, interference with the stirring path of the stirring device can be avoided.

[0016] Preferably, the stirring structure includes a vertically arranged stirring rod, which is connected to the stirring shaft by a connecting rod; the stirring rod connected by the connecting rod can increase the size of the stirring area.

[0017] Preferably, a dipping structure base is also installed below the dipping tank, and a dipping drive device is installed on the dipping structure base to drive the dipping moving seat to move up and down; the dipping drive device can realize the automation of dipping the partition.

[0018] Therefore, the present invention has the following beneficial effects: (1) It can ensure the stability of the glue temperature, thereby ensuring the impregnation effect and preventing the unreliability of the partition surface structure; (2) When the partition enters and exits the impregnation tank, it is not easy for excess glue to be carried out, thereby reducing the frequency of glue replenishment; (3) It can squeeze out excess glue residue on the partition surface, avoiding unevenness of the partition surface; (4) It can stir the glue while impregnating, avoiding the formation of latex lumps at the bottom and improving the uniformity of the glue; (5) The stirring path and the partition movement path will not interfere with each other. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the external structure of this application.

[0020] Figure 2 This is a schematic diagram of the internal structure of the impregnation box of this application.

[0021] Figure 3 This application Figure 2 A magnified view of a portion of the impregnated structure.

[0022] Figure 4 This application Figure 2 A cross-sectional view along the AA direction.

[0023] Figure 5 This application Figure 4 A cross-sectional view along the BB direction.

[0024] In the diagram: 1. Impregnation tank; 2. Heating plate; 3. Impregnation structure; 31. Elastic baffle; 32. Partition; 33. Impregnation zone; 34. Upper edge; 35. Lower edge; 36. Baffle fixing bolt; 37. Impregnation moving seat; 38. Impregnation window; 39. Partition inlet; 310. Sealing gasket; 4. Impregnation guide seat; 41. Guide rail; 5. Stirring device; 51. Stirring shaft; 52. Stirring rod; 53. Connecting rod; 6. Impregnation structure base; 7. Impregnation drive device; 8. Stirring drive device. Detailed Implementation

[0025] The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0026] like Figure 1-5 In the illustrated embodiment, a battery separator impregnation structure includes an impregnation tank 1. A temperature control structure, comprising a heating plate 2 and a temperature sensor, is installed inside the impregnation tank. The heating plate is mounted on the inner wall of the impregnation tank. An impregnation structure 3, extending through the bottom of the impregnation tank, is installed at the bottom of the tank. The separator to be impregnated is installed within this structure. The impregnation structure includes two elastic baffles 31 located on either side of the separator. The middle portion of each elastic baffle protrudes outward in the direction opposite to the separator, forming an impregnation area 33 between the elastic baffle and the separator 32. The size of this impregnation area changes with the deformation of the elastic baffle; when the elastic baffle pops outward, the impregnation area increases, and when the elastic baffle is compressed and contracts inward, the impregnation area decreases. Each elastic baffle includes an upper edge 34 and a lower edge 35, both of which are in contact with the separator. The impregnation area is located between the upper and lower edges. The upper edge of the elastic baffle is fixedly connected to the upper side of the dipped rubber moving seat, and the lower edge of the elastic baffle is fixedly connected to the lower side of the dipped rubber moving seat. The upper edge of the elastic baffle is fixed to the dipped rubber moving seat by a baffle fixing bolt 36 passing through the upper side of the dipped rubber moving seat, and the lower edge of the elastic baffle is fixed to the dipped rubber moving seat by a baffle fixing bolt passing through the lower side of the dipped rubber moving seat. When assembling the dipped rubber moving seat, first place a positioning partition sample or an aluminum plate of the same size into the dipped rubber moving seat, and then install the two elastic baffles on both sides of the partition. Both elastic baffles have round holes at their upper and lower ends. Then, the baffle fixing bolts are passed through the corresponding holes on the dipped rubber moving seat into the round holes and self-tapping threads in the round holes. Since the elastic baffle is made of rubber, which has very low strength, it is easy to self-tap the threads.

[0027] The impregnation structure also includes an up-and-down movable impregnation seat 37, which includes impregnation windows 38 located on both sides of the partition, with the elastic baffle located in the impregnation window; the difference between the width of the impregnation window and the width of the elastic baffle does not exceed 5mm; when the impregnation seat is in the upper limit position, the lower end of the impregnation window is located above the bottom surface of the impregnation tank, so that the impregnation window will not be exposed outside the impregnation tank during the impregnation process, thus preventing the glue from leaking out.

[0028] The impregnation tank is also equipped with an impregnation guide seat 4, which has a guide rail 41. The impregnation movable seat is mounted on the impregnation guide seat. The guide rail is a guide rib, and the impregnation movable seat has a guide groove that matches the guide rib. The side of the impregnation movable seat facing away from the impregnation guide seat is the partition inlet side, which has a partition inlet 39 and a sealing gasket 310 installed at the partition inlet.

[0029] The impregnation tank is also equipped with a stirring device 5, which includes a stirring shaft 51, a stirring structure mounted on the stirring shaft, and a stirring drive device 8 for driving the stirring shaft. The stirring structure includes a vertically arranged stirring rod 52, which is connected to the stirring shaft by a connecting rod 53.

[0030] Below the impregnation tank, there is also an impregnation structure base 6, on which an impregnation drive device 7 is installed to drive the impregnation moving seat up and down. At the same time, a stirring drive device is also installed on the impregnation structure base.

[0031] During the impregnation process of the partition plate using the device, firstly, the impregnation drive moves the impregnation moving seat downwards to its lower limit position. At this point, the partition plate is inserted between two elastic baffles. After the partition plate is fully inserted, the impregnation moving seat moves upwards into the impregnation tank. During entry into the impregnation tank, the two elastic baffles are squeezed by the inlet and outlet, thus forming a seal at the inlet and outlet to prevent the glue from leaking out of the impregnation tank. After entering the impregnation tank, the deformation of the two elastic baffles returns to normal, and they bulge outwards, thus forming a larger impregnation area between the partition plate and the elastic baffles. As the elastic baffles bulge outwards, the glue enters the impregnation area and comes into contact with the partition plate. After a period of time, the impregnation is completed, and the impregnation moving seat moves downwards out of the impregnation tank. During the downward movement of the impregnation moving seat, the elastic baffles first contract inwards, squeezing out the glue in the impregnation area and adhering to the surface of the partition plate as much as possible to level the surface of the partition plate. After the impregnation moving seat moves into position, the partition plate is removed and replaced with a new partition plate to be impregnated.

[0032] During the impregnation process, the stirring device stirs the adhesive solution in the impregnation tank. At the same time, the temperature sensor detects the temperature inside the impregnation tank. If the temperature is lower than the required value, it is heated by a heating plate.

Claims

1. A battery separator gelation structure, characterized in that, The impregnation box is provided with a temperature control structure, and an impregnation structure penetrating the bottom surface of the impregnation box is arranged at the bottom of the impregnation box. A partition plate to be impregnated is arranged in the impregnation structure. The impregnation structure comprises elastic baffles arranged on both sides of the partition plate, and an impregnation area is formed between the elastic baffles and the partition plate. The middle part of the elastic baffles protrudes outward in the direction away from the partition plate. When the elastic baffles protrude outward, the impregnation area becomes larger, and when the elastic baffles are pressed to shrink inward, the impregnation area becomes smaller. The elastic baffles comprise upper edges and lower edges, and the upper edges and the lower edges of the elastic baffles are attached to the partition plate. The impregnation area is located between the upper edges and the lower edges. During the process of the impregnation structure entering the impregnation box, the two elastic baffles are extruded by the inlet and outlet of the impregnation box.

2. The battery separator coating structure of claim 1, wherein, The impregnation structure further comprises an impregnation moving seat moving up and down, and the impregnation moving seat comprises impregnation windows arranged on both sides of the partition plate, and the elastic baffles are located in the impregnation windows.

3. The battery separator coating structure of claim 2, wherein the coating is a polyvinyl alcohol coating. The difference between the width of the impregnation window and the width of the elastic baffle is not more than 5 mm.

4. The battery separator coating structure of claim 1, wherein, The upper edges of the elastic baffles are fixedly connected to the upper side of the impregnation moving seat, and the lower edges of the elastic baffles are fixedly connected to the lower side of the impregnation moving seat.

5. The battery separator coating structure of claim 2, wherein the coating is a polyvinyl alcohol coating. The impregnation box is further provided with an impregnation guide seat, and the impregnation guide seat is provided with a guide rail, and the impregnation moving seat is arranged on the impregnation guide seat.

6. The battery separator coating structure of claim 5, wherein the coating is applied to the surface of the battery separator by a method selected from the group consisting of dip coating, flow coating, spin coating, spray coating, and combinations thereof. The side of the impregnation moving seat away from the impregnation guide seat is a partition plate entering side, and the partition plate entering side is provided with a partition plate inlet, and a sealing gasket is arranged at the partition plate inlet.

7. The battery separator coating structure according to any one of claims 1-6, wherein the coating structure is characterized by, The impregnation box is further provided with a stirring device, and the stirring device comprises a stirring shaft, a stirring structure arranged on the stirring shaft, and a stirring driving device for driving the stirring shaft.

8. The battery separator coating structure of claim 7, wherein the coating is applied to the surface of the battery separator by a method selected from the group consisting of dip coating, spray coating, and spin coating. The stirring structure comprises a stirring rod arranged vertically, and the stirring rod and the stirring shaft are connected through a connecting rod.

9. The battery separator coating structure of any one of claims 1-6, wherein the coating structure is characterized by, The impregnation box is further provided with an impregnation structure base below, and the impregnation structure base is provided with an impregnation driving device for driving the impregnation moving seat to move up and down.

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