Drying oven for dry stretching heat treatment of battery diaphragm

Abstract

The utility model discloses a battery diaphragm dry stretching heat treatment oven which comprises an oven body formed by connecting a plurality of modularized heat treatment baking units end to end, wherein an upper row of diaphragm roller sets and a lower row of diaphragm roller sets are arranged in a baking chamber of each heat treatment baking unit, and driving rollers and driven rollers in the upper diaphragm roller sets are arranged at intervals; each baking chamber is provided with more than two external hot air circulating devices in front and back, front and back air inlet plenum chambers are arranged between the lower insulation board and the lower diaphragm roller group, front and back air return plenum chambers are arranged between the upper insulation board and the upper diaphragm roller group, and each hot air circulating device is respectively communicated with the corresponding air inlet plenum chamber and the corresponding air return plenum chamber; cavity openings of the adjacent baking cavities are communicated in a sealed butt joint mode, a heat preservation partition plate is arranged at each communication position, and a diaphragm channel is formed in each heat preservation partition plate. A diaphragm inlet and a diaphragm outlet are formed in the inlet insulation board and the outlet insulation board of the ports of the head baking chamber and the tail baking chamber, and a diaphragm storage unit for adjusting length change and controlling tension stability is arranged corresponding to the diaphragm outlet.

Description

Technical Field

[0001] This utility model relates to baking equipment, specifically an oven for dry stretching heat treatment of battery separators. Background Technology

[0002] The battery separator is a crucial component of a battery, and its performance affects the battery's capacity, cycle life, and safety.

[0003] The commonly used dry process for battery separators involves melting and extruding polyolefin resin to form a polymer film, which is then stretched at high and low temperatures to form a crystalline structure with a certain pore size and porosity. After crystallization heat treatment and heat setting annealing, a highly oriented porous thin film is obtained.

[0004] The heat treatment oven is a key component of the dry stretching production line for battery separators. It is mainly used for heat treatment and heat setting of separators after dry stretching at high and low temperatures.

[0005] Heat treatment requires the oven to have high temperature uniformity and stability to ensure the consistency of the diaphragm heat treatment process; at the same time, the heat treatment process is long and requires a large space, which places high demands on the heat preservation performance of the heat preservation box.

[0006] Existing oven structures cannot guarantee high temperature uniformity and stability, thus affecting diaphragm performance. Utility Model Content

[0007] To address the shortcomings of existing technologies, this utility model proposes a dry stretching heat treatment oven for battery separators.

[0008] A battery separator dry stretching heat treatment oven capable of solving existing technical problems comprises a box body consisting of multiple modularly designed heat treatment baking units connected end-to-end, wherein:

[0009] 1. Each heat treatment baking unit includes a baking chamber based on a frame and surrounded by upper, lower, left, and right insulation plates. Each baking chamber has a row of diaphragm rollers spaced equidistantly at the front and back. The rollers of the upper and lower rows of diaphragm rollers are staggered. In the upper row of diaphragm rollers, the active rollers and passive rollers are spaced apart. In the lower row of diaphragm rollers, each roller is a passive roller.

[0010] 2. Each heat treatment baking unit is equipped with two or more sets of external hot air circulation devices at the front and rear. An air inlet static pressure box is provided between the lower insulation plate and the lower diaphragm roller group, which is aligned with each hot air circulation device. A return air static pressure box is provided between the upper insulation plate and the upper diaphragm roller group, which is aligned with each hot air circulation device. Each hot air circulation device is connected to the aligned air inlet static pressure box and return air static pressure box respectively.

[0011] 3. The openings of adjacent baking chambers are sealed and connected, and each connection point is equipped with a heat-insulating partition. Each heat-insulating partition has a diaphragm channel that is flush with the lower diaphragm roller group.

[0012] 4. The baking chamber port of the first heat treatment baking unit is provided with an inlet insulation plate, and a diaphragm inlet is opened on the inlet insulation plate. The baking chamber port of the tail heat treatment baking unit is provided with an outlet insulation plate, and a diaphragm outlet is opened on the outlet insulation plate. Both the diaphragm inlet and the diaphragm outlet are flush with the lower diaphragm roller group.

[0013] Furthermore, one structure of each hot air circulation device includes a fan mounted on a bracket, a heater installed at the blower of the fan and connected to a blower pipe, the blower pipe being connected to an inlet static pressure box, an inlet pipe being connected to the air inlet of the fan, and the inlet pipe being connected to a return static pressure box; an air regulating valve is installed on the blower pipe, and the inlet pipe is provided with a fresh air interface near the fan and an exhaust gas outlet near the return static pressure box.

[0014] Typically, each heat treatment baking unit is equipped with a temperature sensor and a pressure sensor in its baking chamber.

[0015] Conventionally, each heat treatment baking unit has two or more insulation doors on the side of the baking chamber, and each insulation door has an observation window.

[0016] Furthermore, the distance between the upper and lower rows of separator rollers is set to at least 1.0 meter to achieve a long process of the battery separator within the baking unit and to ensure effective heat treatment time for the battery separator.

[0017] Furthermore, a storage membrane unit is provided on the rear side of the heat treatment baking unit at the tail end to adjust the change in the length of the battery separator and control the stability of the battery separator tension.

[0018] One structure of the film storage unit includes a film storage roller assembly. The film storage roller assembly includes an active roller, a passive roller, a tensioning roller, and another active roller arranged sequentially in front and rear at the top of the machine housing. The two passive rollers are positioned below the front active roller, one in front and one in rear. The tensioning roller is equipped with a tension sensor, and a vertical linear guide rail is provided below the tensioning roller. A slide is mounted on the linear guide rail. Two floating rollers are symmetrically arranged in front of and behind the slide with respect to the vertical center line of the tensioning roller and are connected to the slide via a roller frame. A floating cylinder is provided below the slide, and the cylinder rod of the floating cylinder extends upward and is connected to the slide. An inlet channel, flush with the lower row of diaphragm rollers in the baking chamber, is opened on the front panel of the machine housing for the front and rear passive rollers. An outlet channel, aligned with the rear active roller, is opened on the rear panel of the machine housing.

[0019] The beneficial effects of this utility model are:

[0020] 1. The dry stretching heat treatment oven for battery separators of this utility model has high temperature uniformity and stability, providing an ideal long-process high-temperature environment for battery separator heat treatment and ensuring the consistency of the process.

[0021] 2. This utility model adopts hot air circulation, which reduces energy consumption, realizes online heat treatment of the diaphragm, and enables continuous production and continuous improvement of efficiency.

[0022] 3. The oven unit of this utility model adopts a modular design, which facilitates combination to meet the needs of battery separator heat treatment process. Attached Figure Description

[0023] Figure 1 This is a first-view isometric view of one embodiment of the present invention.

[0024] Figure 2 for Figure 1 Schematic diagram of the AA section structure.

[0025] Figure 3 for Figure 1 A schematic diagram of the membrane storage unit in the implementation method.

[0026] Drawing number identification: 1. Heat treatment baking unit; 11. Frame; 12. Insulation board; 13. Active roller; 14. Passive roller; 15. Inlet static pressure box; 16. Return static pressure box; 17. Insulation partition; 18. Diaphragm channel; 19. Inlet insulation board; 110. Diaphragm inlet; 111. Diaphragm outlet; 112. Insulation door; 113. Outlet insulation board; 2. Hot air circulation device; 21. Support; 22. Fan; 23. Heater; 24. Blower pipe; 25. Inlet pipe; 26. Air regulating valve; 27. Fresh air interface; 28. Exhaust gas outlet; 3. Membrane storage unit; 31. Chassis; 32. Tension roller; 33. Floating roller; 34. Linear guide rail; 35. Floating cylinder; 36. Slide; 4. Temperature sensor; 5. Pressure sensor; 6. Battery diaphragm; 7. Tension sensor. Detailed Implementation

[0027] The technical solution of this utility model will be further described below with reference to the embodiments shown in the accompanying drawings.

[0028] This utility model relates to a dry stretching heat treatment oven for battery separators, comprising three independent heat treatment baking units 1 (the number of oven units is configured according to the heat treatment process requirements). Each heat treatment baking unit 1 adopts a modular design, with the following dimensions: length = 2.5 meters, width = 2.2 meters, and height = 3.5 meters. Figure 1 As shown.

[0029] Each heat treatment baking unit 1 includes a frame frame 11. The frame 11 contains a baking chamber enclosed by upper, lower, left, and right insulation plates 12. An elastic heat-insulating sealing gasket is provided between each insulation plate 12 and the frame 11. The front and rear ends of the baking chamber are open. A row of diaphragm rollers, consisting of rollers spaced equidistantly at the front and rear, is located in the upper part of the baking chamber. A row of diaphragm rollers, also consisting of rollers spaced equidistantly at the front and rear, is also located in the lower part of the baking chamber. The upper and lower rows of diaphragm rollers... The rollers in the upper and lower rows of diaphragm roller groups are staggered with a spacing of 2 meters. In the upper row of diaphragm roller groups, four active rollers 13 (equipped with corresponding power mechanisms) and four passive rollers 14 are spaced apart by 0.3 meters. In the lower row of diaphragm roller groups, all nine rollers are passive rollers 14 spaced 0.3 meters apart. In both the upper and lower rows of diaphragm roller groups, the left and right shaft ends of each roller pass through the insulation plate 12 and the elastic heat insulation sealing gasket and are mounted on the corresponding positions of the frame 11 via bearings. Figure 1 , Figure 2 As shown.

[0030] The baking chamber between the upper insulation plate 12 and the upper diaphragm roller assembly is equipped with two front and rear return air static pressure boxes 16. Between the lower insulation plate 12 and the lower diaphragm roller assembly, there are two front and rear inlet air static pressure boxes 15. Each inlet air static pressure box 15 has front and rear air outlets on its top, with each outlet (hole-shaped or slit-shaped) spaced between the rollers in the lower diaphragm roller assembly. The air inlet of each inlet air static pressure box 15 is located on its left side. The air inlet of each return air static pressure box 16 (containing a return air plate inclined at 15°–75° to the diaphragm roller assembly)... The openings on the air panel (either perforated or slit-shaped) are located on the side, while the air outlets of each return air static pressure box 16 are located on the top. Insulation doors 112 are installed on the front and rear door openings of the right-side insulation panel 12, each with an observation window. Front and rear detection components are located on the inner side of the left-side insulation panel 12. Each detection component includes a temperature sensor 4 and a pressure sensor 5 located at the top and bottom, respectively. The temperature sensor 4 and pressure sensor 5 are used to detect, monitor, and control the temperature and pressure of the baking chamber, facilitating the adjustment of the diaphragm heat treatment process. Figure 1 , Figure 2 As shown.

[0031] Two sets of hot air circulation devices 2 (for temperature control of the baking chamber, with a temperature control range of 60℃ to 200℃) are provided on the left front and rear sides of each heat treatment baking unit 1. Each hot air circulation device 2 includes a fan 22 mounted on a bracket 21, a heater 23 installed at the air outlet of the fan 22 and connected to an air pipe 24. The air pipe 24 (passing through the insulation board 12 and the elastic heat insulation sealing gasket) is connected to the air inlet of the corresponding air inlet static pressure box 15, and is connected to the air inlet of the fan 22. Pipe 25, the air inlet pipe 25 is connected to the air outlet of the corresponding return air static pressure box 16; the blower pipe 24 is equipped with an air regulating valve 26 for adjusting the air volume; the air inlet pipe 25 is provided with a fresh air inlet 27 near the fan 22 and an exhaust outlet 28 near the return air static pressure box 16. The exhaust outlet 28 discharges part of the old air in the baking chamber, and the fresh air inlet 27 introduces some fresh air from the outside, thereby completing the circulation and renewal of the air in the baking chamber and ensuring cleanliness. Figure 1 , Figure 2 As shown.

[0032] The baking chambers of the three independent heat treatment baking units 1 are arranged in a front, middle, and rear configuration, and connected end to end to form a box with a certain distance between them. That is, the openings of adjacent baking chambers are connected by a joint. The openings at the joints are equipped with double-layer sealing strips for heat insulation and sealing. Insulation partitions 17 are installed at the connecting points to maintain a certain degree of independence for each baking chamber, avoid interference between process areas, and facilitate the adjustment of the heat treatment process. The insulation partitions 17 can be installed at both connecting points or only at one connecting point. The arrangement facilitates adjustments and combinations of the heat treatment process. Each insulating partition 17 has a diaphragm channel 18 at its lower part, flush with the lower diaphragm roller assembly. The port of the first baking chamber has an inlet insulating plate 19, with a diaphragm inlet 110 at its lower part. The port of the last baking chamber has an outlet insulating plate 113, with a diaphragm outlet 111 at its lower part. Both the diaphragm outlet 111 and the diaphragm inlet 110 are flush with the lower diaphragm roller assembly. Figure 1 , Figure 2 As shown.

[0033] like Figure 1 As shown, a film storage unit 3 is provided on the rear side of the tail-end baking chamber, such as... Figure 3 As shown, the film storage unit 3 includes a film storage roller group based on the chassis 31. The film storage roller group includes two active rollers 13, three passive rollers 14, one tensioning roller 32, and two floating rollers 33, wherein:

[0034] 1. Two active rollers 13 are positioned at the top of the machine housing (aligned with the upper row of diaphragm rollers in the baking chamber), and a passive roller 14 and a tension roller 32 are positioned between the two active rollers 13, with a distance of 0.3 meters between the four rollers.

[0035] 2. Two passive rollers 14 are set at the bottom of the machine housing 31 (flat with the lower row of diaphragm rollers in the baking chamber). The rear passive roller 14 is positioned between the upper passive roller 14 and the front active roller 13, and the front passive roller 14 is located in front of the front active roller 13.

[0036] 3. The tension roller 32 is provided with a tension sensor 7 for detecting the tension of the battery separator 6. A vertical linear guide pair is provided below the tension roller 32. The linear guide pair includes a slide block 36 that is slidably mounted on a linear guide rail 34. A floating cylinder 35 is provided below the slide block 36. The cylinder rod of the floating cylinder 35 extends upward and is connected to the slide block 36.

[0037] 4. Two floating rollers 33 are set in front of and behind the slide block 36 and installed on the slide block 36 through roller frames, and are symmetrical about the vertical center line of the tension roller 32.

[0038] 5. The front and rear housings of the chassis are respectively provided with an inlet channel and an outlet channel. The outlet channel is aligned with the rear active roller 13, and the inlet channel is aligned with the front passive roller 14.

[0039] In the structure of the membrane storage unit 3, the battery separator 6 enters the housing 31 through the inlet channel, wraps around the front, rear, upper, and lower rollers in sequence, and exits the housing 31 through the outlet channel. The front and rear floating rollers 33 slide synchronously up and down along the linear guide rail 34 under the drive of the floating cylinder 35, thereby realizing the adjustment of the vertical distance between the front and rear floating rollers 33 and the tension roller 32. When the tension sensor 7 detects that the tension value of the battery separator 6 is too low, the cylinder rod of the floating cylinder 35 retracts, and the front and rear floating rollers 33 move downward to increase the vertical distance between the front and rear floating rollers 33 and the tension roller 32, thereby maintaining the constant tension of the battery separator 6. Conversely, the cylinder rod extends, and the front and rear floating rollers 33 move upward to reduce the vertical distance between the front and rear floating rollers 33 and the tension roller 32.

[0040] The battery separator 6 enters through the separator inlet 110 of the inlet insulation plate 19, passes through the front, middle, and rear heat treatment baking units 1 in sequence, and exits through the separator outlet 111 of the outlet insulation plate 113. Its length is adjusted and tension is controlled in the membrane storage unit 3. Within each heat treatment baking unit 1, the battery separator 6 is sequentially wrapped around the upper and lower rollers and the front and rear rollers. Inside the housing, the battery separator 6 passes through the separator channel 18 through the adjacent heat treatment baking unit 1, such as... Figure 1 As shown.

[0041] This invention provides the necessary long-process high-temperature environment for the heat treatment of battery separators. The newly designed oven has high temperature uniformity and stability, ensuring the consistency of the separator heat treatment process, improving heat preservation performance, reducing energy consumption, and realizing continuous and efficient production of separators in online heat treatment.

Claims

1. A dry stretching heat treatment oven for battery separators, characterized in that... The enclosure comprises a box consisting of multiple modularly designed heat treatment and baking units (1) connected end to end, wherein: Each heat treatment baking unit (1) includes a baking chamber based on a frame (11) and surrounded by upper, lower, left and right insulation plates (12). The upper and lower parts of the baking chamber are each provided with a row of diaphragm roller groups composed of several rollers at equal intervals in front and back. The rollers of the upper and lower rows of diaphragm roller groups are staggered. In the upper row of diaphragm roller groups, the active roller (13) and the passive roller (14) are arranged alternately. In the lower row of diaphragm roller groups, each roller is a passive roller (14). Each heat treatment baking unit (1) is equipped with two or more sets of external hot air circulation devices (2) at the front and rear. Between the lower insulation plate (12) and the lower diaphragm roller group, there is an air inlet static pressure box (15) aligned with each hot air circulation device (2). Between the upper insulation plate (12) and the upper diaphragm roller group, there is a return air static pressure box (16) aligned with each hot air circulation device (2). Each hot air circulation device (2) is connected to the aligned air inlet static pressure box (15) and return air static pressure box (16). The openings of adjacent baking chambers are sealed and connected, and each connection is provided with a heat insulation partition (17). Each heat insulation partition (17) has a diaphragm channel (18) that is flush with the lower diaphragm roller group. The baking chamber port of the first heat treatment baking unit (1) is provided with an inlet insulation plate (19), and a diaphragm inlet (110) is opened on the inlet insulation plate (19). The baking chamber port of the tail heat treatment baking unit (1) is provided with an outlet insulation plate (113), and a diaphragm outlet (111) is opened on the outlet insulation plate (113). The diaphragm inlet (110) and the diaphragm outlet (111) are both flush with the lower diaphragm roller group.

2. The battery separator dry stretching heat treatment oven according to claim 1, characterized in that: Each hot air circulation device (2) includes a fan (22) mounted on a bracket (21), a heater (23) installed at the blower of the fan (22) and connected to a blower pipe (24), the blower pipe (24) being connected to an inlet static pressure box (15), an inlet pipe (25) being connected to the air inlet of the fan (22), and the inlet pipe (25) being connected to a return static pressure box (16); an air regulating valve (26) is installed on the blower pipe (24), and the inlet pipe (25) is provided with a fresh air interface (27) near the fan (22) and an exhaust gas outlet (28) near the return static pressure box (16).

3. The dry stretching heat treatment oven for battery separators according to claim 1, characterized in that: Each heat treatment baking unit (1) is equipped with a temperature sensor (4) and a pressure sensor (5) in its baking chamber.

4. The battery separator dry stretching heat treatment oven according to claim 1, characterized in that: Each heat treatment baking unit (1) has two or more insulation doors (112) on the side of the baking chamber, and each insulation door (112) has an observation window.

5. The dry stretching heat treatment oven for battery separators according to any one of claims 1 to 4, characterized in that: The distance between the upper and lower rows of diaphragm rollers is at least 1.0 meter.

6. The dry stretching heat treatment oven for battery separators according to any one of claims 1 to 4, characterized in that: The rear side of the tail end heat treatment baking unit (1) is provided with a storage membrane unit (3) for adjusting the length of the battery separator (6) and controlling the tension stability of the battery separator (6).

7. The dry stretching heat treatment oven for battery separators according to claim 6, characterized in that: The film storage unit (3) includes a film storage roller assembly. The film storage roller assembly includes an active roller (13), a passive roller (14), a tensioning roller (32), and another active roller (13) arranged sequentially in front and behind the upper part of the housing (31). The two passive rollers (14) are arranged in front and behind the front active roller (13). The tensioning roller (32) is equipped with a tension sensor (7). A vertical linear guide rail (34) is provided below the tensioning roller (32). A slide (36) is installed on the linear guide rail (34). A floating roller (33) is symmetrically arranged on the front and rear of the slide block (36) with respect to the vertical center line of the tension roller (32) and connected to the slide block (36) through a roller frame. A floating cylinder (35) is provided below the slide block (36), and the cylinder rod of the floating cylinder (35) extends upward and is connected to the slide block (36). The front and rear passive rollers (14) are aligned with the inlet channel of the lower row of diaphragm rollers in the baking chamber on the front box plate of the machine housing (31), and the corresponding rear active roller (13) is aligned with the outlet channel of the rear box plate of the machine housing (31).

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