A battery insulation sheet forming process

Abstract

The application provides a battery insulating sheet forming process, comprising the following steps: S1, pretreatment: pouring raw materials into a hopper, and moving a die head and a first compression roller to a second compression roller by a certain distance; S2, preheating and discharging: heating the raw materials in the hopper, the first compression roller and the second compression roller, and making the heated raw materials in the hopper flow from a discharge port to between the first compression roller and the second compression roller through the die head; S3, hot-pressing forming: rotating the first compression roller and the second compression roller to hot-press the semi-solid raw materials falling from the die head into a sheet-shaped semi-finished product; S4, roller cooling; and S5, finished product. The battery insulating sheet forming process provided by the application moves the die head to the second compression roller by a certain distance through the pretreatment link, so that the semi-solid raw materials fall on the second compression roller and are accumulated on the second compression roller to generate a certain stress on the sheet-shaped semi-finished product; when the sheet-shaped semi-finished product is on the cooling roller, the stress can effectively resist the stress caused by the temperature difference, so that the sheet-shaped finished product passing through the cooling roller remains flat.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of insulation sheet production, in particular to a battery insulation sheet forming process. BACKGROUND

[0002] Insulation sheets play a role of separation in electrical or electronic equipment, mainly thin sheet made of polyimide, phenolic resin, polypropylene, polycarbonate and other high molecular materials, which has high insulation and high temperature resistance.

[0003] The electric core is the main electric drive component in new energy electric vehicles, and insulation sheets need to be equipped in the electric core to prevent electric energy from breaking through the electric core. Therefore, the insulation sheet needs high flatness and insulation effect.

[0004] However, in the production process of the battery insulation sheet, the shrinkage of the insulation sheet is high, so that after the insulation sheet is molded, the two sides of the insulation sheet are easily shrunk due to uneven heating during the conveying and cooling process, which causes the corners to warp, and then a heavy object needs to be pressed for a long time (usually 24-48 hours) to flatten the phenomenon of corner warping. Long shaping time will slow down the overall production process, thereby affecting the production efficiency of the electric core. SUMMARY

[0005] The purpose of the present application is to solve the above problems existing in the prior art.

[0006] In order to achieve the above purpose, the present application can be realized by the following technical scheme: a battery insulation sheet forming process, comprising the following steps:

[0007] S1, pretreatment: pouring raw materials into a hopper, and moving a die head and a first compression roller to a second compression roller by a certain distance;

[0008] S2, preheating and discharging: heating the raw materials in the hopper, the first compression roller and the second compression roller, and flowing the heated raw materials in the hopper from the discharge port to between the first compression roller and the second compression roller through the die head;

[0009] S3, hot pressing forming: the first compression roller and the second compression roller rotate to hot press the semi-solid raw materials falling from the die head into a sheet-shaped semi-finished product;

[0010] S4, roller pressing and cooling: the sheet-shaped semi-finished product is attached to a cooling roller to cool the sheet-shaped semi-finished product as the second compression roller and the first compression roller are conveyed;

[0011] S5, finished product: detecting and packaging the finished product.

[0012] The S1 pretreatment of the embodiment of the present application comprises the following steps:

[0013] S11, first compression roller pretreatment: the first compression roller is driven by the first transmission member to move towards or away from the second compression roller by a certain distance;

[0014] S12, die pretreatment: an axis is constructed on the second compression roller, the axis is located between the first compression roller and the second compression roller and is vertically attached to the second compression roller, and then the die is driven by the second transmission member to move towards the first compression roller, so that one side of the die discharge port coincides with the axis.

[0015] In the embodiment of the application, the distance between the first compression roller and the second compression roller in S2 is between 2mm and 6mm, and the distance between the die discharge ports is greater than the distance between the first compression roller and the second compression roller.

[0016] In the embodiment of the application, the heating temperature of the hopper in S2 is controlled to be between 210℃ and 275℃, and waiting for 3-5 minutes.

[0017] In the embodiment of the application, the heating temperature of the first compression roller and the second compression roller in S2 is consistent, and the temperature is controlled to be between 230℃ and 265℃.

[0018] In the embodiment of the application, the rotating speed of the first compression roller and the second compression roller in S3 is consistent, and the rotating directions are opposite.

[0019] In the embodiment of the application, the temperature of the cooling roller in S4 is controlled to be between 60℃ and 95℃.

[0020] In the embodiment of the application, the second compression roller in S4 is located between the cooling roller and the first compression roller, and the distance between the cooling roller and the second compression roller is equal to the distance between the first compression roller and the second compression roller.

[0021] In the embodiment of the application, the first transmission member in S11 includes a sliding block, a cylinder and a linkage block arranged at the output end of the cylinder, the linkage block is engaged with the sliding block, and the sliding block is fixed to the end of the first compression roller.

[0022] In the embodiment of the application, the second transmission member in S12 includes a support seat and a motor arranged on the support seat, the output end of the motor is provided with a screw rod, and a support plate supporting the die is threadedly connected to the screw rod.

[0023] Compared with the prior art, the application has the advantages that: by using the pretreatment link, the die is moved towards the second compression roller by a certain distance, so that the semi-cured raw material falls on the second compression roller and accumulates on the second compression roller to generate a certain stress on the sheet-shaped semi-finished product, and when the sheet-shaped semi-finished product is located on the cooling roller, the stress can effectively resist the stress caused by the temperature difference, so that the sheet-shaped finished product passing through the cooling roller remains flat. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1is a roll forming process diagram of the battery insulation sheet provided by the present application;

[0025] Figure 2 is a schematic diagram of the lamination of the blanking area and the first and second compression rollers under the traditional;

[0026] Figure 3 is a schematic diagram of the lamination of the blanking area and the first and second compression rollers;

[0027] Figure 4 is a schematic diagram of the forming of the raw material in the blanking area and the first and second compression rollers;

[0028] Figure 5 is a schematic diagram of the overall structure;

[0029] Figure 6 is a schematic diagram of the overall structure;

[0030] Figure 7 is a schematic diagram of the position of the die and the first and second compression rollers.

[0031] Explanation of reference signs:

[0032] 1, first compression roller; 11, axis; 2, blanking area; 21, first lamination surface; 22, second lamination surface; 3, second compression roller; 4, sheet-shaped semi-finished product; 5, cooling roller; 6, support frame; 61, first transmission member; 611, linkage block; 612, air cylinder; 613, sliding block; 62, second transmission member; 621, support seat; 622, motor; 623, support plate; 624, screw; 63, third transmission member; 631, connecting block; 632, transmission roller; 633, spring; 634, telescopic sleeve; 7, die. DETAILED DESCRIPTION

[0033] The following is a specific embodiment of the present application and further describes the technical solutions of the present application in conjunction with the accompanying drawings.

[0034] Example 1

[0035] As shown in Figures 1-4 , a battery insulation sheet forming process includes the following steps:

[0036] S1, pretreatment: pouring raw materials into a hopper, and moving the die 7 and the first compression roller 1 to the second compression roller 3 by a certain distance;

[0037] S2, preheating and discharging: heating the raw materials in the hopper, the first compression roller 1 and the second compression roller 3, and making the heated raw materials in the hopper flow from the discharge port to between the first compression roller 1 and the second compression roller 3 through the die 7;

[0038] S3, Hot pressing: The first pressure roller 1 and the second pressure roller 3 rotate to hot press the semi-solid raw material falling from the die head 7 into a sheet-shaped semi-finished product 4.

[0039] S4, Roller cooling: As the second pressure roller 3 and the first pressure roller 1 are conveyed, the sheet-like semi-finished product 4 is brought into contact with the cooling roller 5 to cool the sheet-like semi-finished product 4.

[0040] S5, Finished Product: Inspect the finished product and package it.

[0041] In the above technical solution: a feeding area 2 is constructed at the feeding port of the die head 7, and the feeding area 2 includes a first bonding surface 21 and a second bonding surface 22, while the sheet-like semi-finished product 4 refers to the insulating sheet after hot pressing;

[0042] like Figure 1 As shown, the insulating sheet forming process is a traditional method. The die head 7 is located at the center of the distance between the first pressure roller 1 and the second pressure roller 3. When the die head 7 feeds the material, the semi-cured raw material falls from the feeding area 2 onto the first pressure roller 1 and the second pressure roller 3. Correspondingly, the contact area and stress generated between the first bonding surface 21 and the second bonding surface 22 and the first pressure roller 1 and the second pressure roller 3 are equal. As a result, when the material is transported to the cooling roller 5 for cooling, since the second bonding surface 22 does not contact the cooling roller 5, a temperature difference occurs between the temperature of the first bonding surface 21 and the temperature of the second bonding surface 22. At this time, the sheet-like semi-finished product 4 will shrink towards the first bonding surface 21, resulting in the edge warping phenomenon of the formed sheet-like semi-finished product 4.

[0043] like Figure 2 As shown, the die head 7 is moved a certain distance toward the second pressure roller 3 so that the material outlet of the die head 7 faces the second pressure roller 3. When the die head 7 is discharging material, the material will accumulate above the second pressure roller 3, so that the second pressure roller 3 and the second bonding surface 22 make surface contact and generate a certain stress at the second bonding surface 22. At the same time, the second pressure roller 3 will carry away some of the heat from the second bonding surface 22. However, the first pressure roller 1 and the first bonding surface 21 are still in line contact, so the first bonding surface 21 cannot have some heat carried away by the first pressure roller 1. When the first bonding surface 21 makes surface contact with the cooling roller 5, some of the heat from the first bonding surface 21 will be carried away by the cooling roller 5. Therefore, under the stress of the second bonding surface 22, the stress caused by the temperature difference between the two sides of the sheet semi-finished product 4 can be effectively resisted, so that the sheet finished product 4 after passing through the cooling roller 5 remains flat.

[0044] Further, the extrusion of the first compression roller 1 and the second compression roller 3 makes the material to be deformed and compressed into a sheet under a great extrusion force. In the process of forming the transmission insulation sheet, the material is transported and extruded in the center due to the simultaneous rotation of the first compression roller 1 and the second compression roller 3, so that the material is adsorbed and accumulated on the first compression roller 1 and the second compression roller 3. In the process of forming the insulation sheet, the material is accumulated on the second compression roller 3 in the present application, and the material is extruded with the first compression roller 1 by the driving of the second compression roller 3 and the natural falling, so as to reduce the adsorption and pushing phenomenon.

[0045] Further, the first compression roller 1 and the cooling roller 5 rotate counterclockwise, and the second compression roller 3 rotates clockwise, so that the first compression roller 1 and the second compression roller 3 can push the material to extrude when the material falls, and the efficiency and effect of the material forming are improved.

[0046] As further provided in the embodiments of the present application, the S1 pretreatment includes the following steps:

[0047] S11, first compression roller 1 pretreatment: the first compression roller 1 is driven by the first transmission member 61 to move towards or away from the second compression roller 3 by a certain distance;

[0048] S12, die head 7 pretreatment: an axis 11 is constructed on the second compression roller 3, the axis 11 is located between the first compression roller 1 and the second compression roller 3 and is vertically attached to the second compression roller 3, and then the die head 7 is driven by the second transmission member 62 to move towards the first compression roller 1, so that the discharge port side of the die head 7 coincides with the axis 11.

[0049] Specifically, the first transmission member 61 controls the distance between the first compression roller 1 and the second compression roller 3, and the distance is between 2mm and 6mm. The distance of the discharge port of the die head 7 is greater than the distance of the first compression roller 1 and the second compression roller 3. Further, the die head 7 is driven by the second transmission member 62 to move towards the second compression roller 3, so that the first attachment surface 21 of the discharge area 2 coincides with the axis 11, and the pretreatment process of the die head is completed. Figure 4 The axis 11 is vertically attached to the leftmost side of the first compression roller 1 from top to bottom.

[0050] As a further embodiment of the present invention, the heating temperature of the hopper before production is controlled at 210℃~275℃, and the raw material in the hopper is softened and semi-solidified for 3~5 minutes, so that it can flow along the die head 7 to the feeding area 2. The heating temperature of the first pressure roller 1 and the second pressure roller 3 is kept relatively consistent (the temperature can be controlled between 230℃~265℃), and the temperature difference between the two pressure rollers is small, so as to improve the forming effect of the sheet semi-finished product 4. Subsequently, the sheet semi-finished product 4 passes through the cooling roller 5, and the temperature of the cooling roller 5 is controlled at 60℃~95℃, so as to cool the sheet semi-finished product 4.

[0051] Example 2

[0052] like Figures 5-7 As shown, based on a battery insulating sheet forming process in Embodiment 1 of the present invention, Embodiment 2 of the present invention provides another battery insulating sheet forming process, wherein Embodiment 2 does not hinder the independent implementation of the technical solution of the first embodiment.

[0053] As a further embodiment of the present invention, the first transmission member 61 in S11 includes a slider 613, a cylinder 612 and a linkage block 611 disposed at the output end of the cylinder 612. The linkage block 611 engages with the slider 613, and the slider 613 is fixed to the end of the first pressure roller 1.

[0054] Specifically, the cylinder 612 controls the linkage block 611 to slide on the support frame 6, thereby pushing the first pressure roller 1 closer to or further away from the second pressure roller 3 via the slider 613, thus adjusting the distance between the two pressure rollers, which is the thickness of the insulating sheet after rolling. At the same time, the cylinder 612 can control the pre-pressure of the first pressure roller 1 towards the second pressure roller 3, thereby improving the rolling effect on the insulating sheet. The support frame 6 supports the first pressure roller 1, the second pressure roller 3, and the cooling roller 5, and keeps the axes of the first pressure roller 1, the second pressure roller 3, and the cooling roller 5 on the same horizontal plane.

[0055] As a further embodiment of the present invention, in S12, the second transmission component 62 includes a support base 621 and a motor 622 disposed on the support base 621. The output end of the motor 622 is provided with a screw 624, and a support plate 623 for supporting the mold head 7 is threadedly connected to the screw 624.

[0056] Specifically, the output end of the motor 622 is connected to a speed reducer to improve the stability of the rotation of the screw rod 624, that is, to make the moving distance of the die head 7 more accurate. The support seat 621 is fixed on the support frame 6 by bolts to support the motor 622, the screw rod 624 and the die head 7. The motor 622 is output to rotate the screw rod 624, and then the die head 7 slides towards the second compression roller 3, so as to adjust the position of the discharge port of the die head 7. In the process, the die head 7 is controlled to move above the second compression roller 3, so that the first contact surface 21 of the discharge area 2 coincides with the axis 11 formed by the second compression roller 3, thereby reducing the edge line warping phenomenon in the insulation sheet forming process.

[0057] Further, the support frame 6 is provided with a third transmission member 63, which includes a connecting block 631, a transmission roller 632, an extension sleeve 634 and a spring 633 arranged in the extension sleeve 634. The extension sleeve 634 includes a sleeve column and a telescopic rod sliding at the axis of the sleeve column, and the spring 633 is a back-pulling telescopic rod. The connecting block 631 is fixed to the end of the telescopic rod, and the transmission roller 632 is arranged on the connecting block 631. After the insulation sheet is extruded and formed, it will contact the transmission roller 632, and under the back-pulling of the spring 633, the tensioning effect of the insulation sheet is improved, so that the insulation sheet better contacts the first compression roller 1, the second compression roller 3 and the cooling roller 5, thereby improving the production effect of the insulation sheet.

[0058] The technical solutions of the above application provide a significantly different solution from the prior art, and the parts not involved in the technical solutions of the application are the same as or can be realized by the prior art, and will not be described again.

[0059] The technical solutions in the above embodiments have clearly and completely described the content of the application. Obviously, the described embodiments are only part of the embodiments of the application, not all. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the application.

Claims

1. A battery separator forming process characterized by, The method comprises the following steps: S1， Preprocessing: pouring raw materials into a hopper, and moving the die head and the first compression roller to the second compression roller by a certain distance; S2, preheating and discharging: heating the raw materials in the hopper, the first compression roller and the second compression roller, and making the heated raw materials in the hopper flow from the discharge port to the space between the first compression roller and the second compression roller through the die head; S3, hot pressing: rotating the first compression roller and the second compression roller to hot-press the semi-solid raw materials falling from the die head into a sheet-shaped semi-finished product; S4, roller pressing and cooling: cooling the sheet-shaped semi-finished product by fitting it with a cooling roller as the second compression roller and the first compression roller are conveyed downward; S5, finished product: detecting and packaging the finished product; The S1 preprocessing comprises the following steps: S11, first compression roller preprocessing: driving the first compression roller to move towards or away from the second compression roller by a certain distance through a first transmission member; S12, die head preprocessing: constructing an axis on the second compression roller, the axis being located between the first compression roller and the second compression roller and being vertically fitted with the second compression roller, and then driving the die head to move towards the first compression roller through a second transmission member so that one side of the discharge port of the die head coincides with the axis.

2. The process for forming a battery separator according to claim 1, wherein The distance between the first compression roller and the second compression roller in S2 is between 2 mm and 6 mm, and the distance between the discharge port of the die head is greater than the distance between the first compression roller and the second compression roller.

3. The process of claim 1, wherein the battery insulation sheet is formed by a process comprising: The heating temperature of the hopper in S2 is controlled at 210-275°C, and the hopper is kept waiting for 3-5 min.

4. The process of claim 1, wherein the battery insulation sheet is formed by a process comprising: The heating temperature of the first compression roller and the second compression roller in S2 is consistent, and the temperature is controlled at 230-265°C.

5. The process of claim 1, wherein the battery insulation sheet is formed by a process comprising: The rotating speed of the first compression roller and the second compression roller in S3 is consistent, and the rotating directions are opposite.

6. The process of claim 1, wherein, The temperature of the cooling roller in S4 is controlled at 60-95°C.

7. The battery insulating sheet forming process according to claim 1, characterized in that, The second compression roller in S4 is located between the cooling roller and the first compression roller, and the distance between the cooling roller and the second compression roller is equal to the distance between the first compression roller and the second compression roller.

8. The battery insulating sheet forming process according to claim 1, characterized in that, The first transmission member in S11 comprises a sliding block, a cylinder and a linkage block provided at the output end of the cylinder, the linkage block is engaged with the sliding block, and the sliding block is fixed to the end of the first compression roller.

9. The process of claim 1, wherein, The second transmission member in S12 comprises a support seat and a motor provided on the support seat, the output end of the motor is provided with a screw rod, and the screw rod is threadedly connected with a support plate supporting the die head.

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