Double-sided asynchronous heat diffusion device for nickel pre-plated steel strip

Abstract

The utility model discloses a double-sided asynchronous heat diffusion device for a pre-nickel-plated steel strip, which comprises the pre-nickel-plated steel strip, and further comprises an uncoiling mechanism, a preheating box, a heating furnace, an exhaust box, a cooling box and a coiling mechanism which are sequentially distributed, the pre-nickel-plated steel strip is a double-sided non-equal-thickness steel strip and is divided into a thick surface and a thin surface, one surface is a thick surface, the other surface is a thin surface, the thin surface faces the condensation pipeline, the thick surface faces the gas guide plate, and the pre-nickel-plated steel strip forms a temperature gradient in the preheating box; the device further comprises a pressure adjusting mechanism which is used for pressing the pre-nickel-plated steel strip and attaching the pre-nickel-plated steel strip to the condensation pipeline. According to the nickel pre-plating device, the nickel pre-plating steel strip with the two unequal-thickness surfaces is subjected to single-surface preheating treatment and overall heat treatment processes, iron-nickel diffusion layers with remarkable difference are formed on the two surfaces of the steel strip, the corrosion resistance of the nickel pre-plating steel strip is effectively improved, and the use safety and the service performance of nickel pre-plating products are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of pre-nickel-plated materials, in particular to a double-sided asynchronous heat diffusion device for a pre-nickel-plated steel strip. Background Art

[0002] With the rapid development of the new energy vehicle industry, the demand for high-performance batteries is also growing. Pre-nickel-plated steel strips have now become the preferred structural material for cylindrical battery shells, especially the 48 series large cylindrical batteries. During the stamping process of the pre-nickel-plated steel plate, the steel strip will undergo huge plastic deformation, and strong friction will occur between the stamping die, which can easily cause the nickel plating on the steel strip to crack or detach. Due to the complexity of the battery working environment, including temperature changes, chemical corrosion and other factors, the corrosion process of the steel strip may be accelerated, thereby affecting the safety and stability of the battery. Therefore, the use of heat treatment after pre-nickel plating is an effective way to enhance the bonding strength between the nickel plating layer and the steel strip, which can improve the service performance of the steel shell.

[0003] In the existing heat treatment technology, if the heat treatment temperature, time and heating / cooling methods are not well controlled, the iron-nickel diffusion layer is prone to be too thin or too thick, resulting in insufficient bonding strength, and then the nickel plating layer detaches or "iron leaks". Especially when the pre-nickel plating thickness on both sides of the steel plate is very different, the iron-nickel diffusion layer on one side is not effectively formed, while the "iron leak" problem has already occurred on the other side. The traditional tunnel resistance furnace heating method is also difficult to avoid the occurrence of the above problems. Utility Model Content

[0004] The utility model provides a double-sided asynchronous heat diffusion device for a pre-nickel-plated steel strip, which can effectively improve the corrosion resistance of double-sided non-uniform thickness pre-plated steel strips and can solve at least one of the above technical problems.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] A double-sided asynchronous heat diffusion device for pre-nickel-plated steel strips, comprising a pre-nickel-plated steel strip, and also comprising an unwinding mechanism, a preheating box, a heating furnace, an exhaust box, a cooling box and a winding mechanism which are sequentially distributed;

[0007] The pre-nickel-plated steel strip is a double-sided non-uniform thickness steel strip, with a thick side and a thin side, one side being a thick side and the other side being a thin side, and is wound on the unwinding mechanism, and after the free end of the pre-nickel-plated steel strip is drawn out, it passes through the preheating box, the heating furnace, the exhaust box and the cooling box in sequence, and enters the winding mechanism;

[0008] Condensation pipes and gas guide plates are arranged horizontally and in parallel with each other inside the preheating box, condensate liquid flows in the condensation pipe, the air inlet channel of the preheating box points to the gas guide plate, and high-temperature gas is introduced, the free end of the pre-nickel-plated steel strip passes horizontally between the condensation pipe and the gas guide plate, the thin side faces the condensation pipe, and the thick side faces the gas guide plate, the pre-nickel-plated steel strip forms a temperature gradient in the preheating box;

[0009] It also includes a pressure regulating mechanism, which is used to compress the pre-nickel-plated steel strip and fit it to the condensation pipe.

[0010] Furthermore, the pressure regulating mechanism includes a support seat, a motor, a coupling, a screw rod, a guide column, a bracket and a roller shaft;

[0011] The motor is mounted on the support seat, and the output power shaft of the motor is fixed to the screw via the coupling. The screw passes through the bottom of the bracket vertically and in the center, and is threadedly engaged with the bracket. There are multiple guide columns, which are distributed in a ring shape on the support seat with the screw as the center, and vertically pass through the bottom of the bracket. The roller is horizontally rotatably mounted on the top of the bracket, and the bracket has a movement stroke for driving the roller to move up and down along the screw. The roller is used to press and fit the pre-nickel-plated steel strip to the condensation pipe, and a pressure sensor for real-time pressure measurement is installed on the roller.

[0012] Furthermore, there are two pressure regulating mechanisms, which are respectively installed at the inlet end of the preheating box and the outlet end of the exhaust box.

[0013] Furthermore, the heating furnace has multiple furnace walls, all of which are made of thermal insulation material, are connected to each other one by one, and are located between the preheating box and the exhaust box. Two rows of heating tubes are installed at upper and lower intervals inside the heating furnace. The pre-nickel-plated steel strip passes between the two rows of heating tubes, and an electric control box electrically connected to the heating tubes is installed on the heating furnace.

[0014] Furthermore, an exhaust channel is provided on the exhaust box, and the exhaust channel is used to discharge the mixed gas after passing through the preheating box and the multiple heating furnaces. The exhaust channel is connected to an exhaust pump, and the air intake channel is connected to an air intake pump. The exhaust speed of the exhaust pump and the air intake speed of the air intake pump are both controllable and always equal.

[0015] Furthermore, a cooling gas channel is provided on the cooling box, and the cooling gas channel is used to introduce cooling gas for preventing oxidation of the pre-nickel-plated steel strip, and the flow rate of the cooling gas is controllable.

[0016] Furthermore, the inlet / outlet ends of the preheating box, the inlet / outlet ends of the heating furnace, the inlet / outlet ends of the exhaust box and the inlet / outlet ends of the cooling box are all at the same horizontal height, and the pre-nickel-plated steel strip horizontally passes through the preheating box, multiple heating furnaces, the exhaust box and the cooling box in sequence.

[0017] Furthermore, it also includes a tensioning wheel mechanism, which has two tensioning wheel mechanisms, which are respectively installed at the output end of the unwinding mechanism and the input end of the winding mechanism. The pre-nickel-plated steel strip passes through the tensioning wheel mechanism, and the tensioning wheel mechanism is used to adjust the tensioning force on the pre-nickel-plated steel strip.

[0018] The beneficial effects of the utility model are embodied in:

[0019] 1. The utility model performs a single-sided preheating treatment process on a pre-nickel-plated steel strip with non-uniform thickness on both sides. After a temperature gradient with a large temperature difference is formed in the steel strip, an overall heat treatment process is performed to form an iron-nickel diffusion layer with significant differences on both sides of the steel strip, thereby effectively improving the corrosion resistance of the pre-nickel-plated steel strip and pre-nickel-plated products, such as battery shells.

[0020] 2. The utility model further ensures that the heat-treated iron-nickel diffusion layer has stronger bonding strength and no "iron leakage" phenomenon by optimizing the heat treatment environment and parameters, thereby improving the safety of use and service performance of pre-nickel-plated products. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings described herein are used to provide further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute improper limitations on the present application.

[0022] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the utility model.

[0023] Figure 2 It is a schematic diagram of the internal gas flow of the local structure of an embodiment of the utility model.

[0024] Figure 3 It is a schematic diagram of a condensation pipeline according to an embodiment of the utility model.

[0025] Figure 4 It is a schematic diagram of a pressure regulating mechanism of an embodiment of the utility model.

[0026] The components in the accompanying drawings are marked as follows: 1. unwinding mechanism; 2. tensioning wheel mechanism; 3. pressure regulating mechanism; 4. preheating box; 401. air inlet channel; 5. condensation pipe; 6. gas guide plate; 7. heating furnace; 701. heating tube; 702. electric control box; 8. exhaust box; 801. exhaust channel; 9. cooling box; 901. cooling gas channel; 10. winding mechanism; 11. pre-nickel-plated steel strip; 12. support seat; 13. motor; 1301. output power shaft; 14. coupling; 15. screw; 16. guide column; 17. bracket; 18. roller. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. In the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0028] It should be noted that if there are directional indications (such as up, down, left, right, front, back, etc.) involved in the embodiments of the present invention, the directional indications are only used to explain the relative position relationship, movement, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly. In addition, the meaning of "and / or" appearing in the full text includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, "multiple" means more than two.

[0029] See also Figure 1-Figure 2 , the embodiment of the utility model provides a double-sided asynchronous heat diffusion device for pre-nickel-plated steel strip, including a pre-nickel-plated steel strip 11, and also includes an unwinding mechanism 1, a preheating box 4, a heating furnace 7, an exhaust box 8, a cooling box 9 and a winding mechanism 10 which are sequentially distributed;

[0030] The pre-nickel-plated steel strip 11 is a double-sided non-uniform thickness steel strip, with one side being a thick side and the other side being a thin side, and is wound on the unwinding mechanism 1, and after the free end of the pre-nickel-plated steel strip 11 is drawn out, it passes through the preheating box 4, the heating furnace 7, the exhaust box 8 and the cooling box 9 in sequence, and enters the winding mechanism 10;

[0031] The interior of the preheating box 4 is horizontally parallel and spaced apart with condensation pipes 5 and gas guide plates 6, the condensation pipes 5 are filled with condensate, the air inlet channel 401 of the preheating box 4 points to the gas guide plate 6, and high-temperature gas is introduced, the free end of the pre-nickel-plated steel strip 11 horizontally passes through between the condensation pipe 5 and the gas guide plate 6, the thin side faces the condensation pipe 5, and the thick side faces the gas guide plate 6, the pre-nickel-plated steel strip 11 forms a temperature gradient in the preheating box 4;

[0032] It also includes a pressure regulating mechanism 3 , which is used to press the pre-nickel-plated steel strip 11 and fit it to the condensation pipe 5 .

[0033] The utility model aims at a pre-nickel-plated steel strip with non-uniform thickness on both sides, performs a single-sided preheating treatment process, forms a temperature gradient with a large temperature difference in the steel strip, and then performs an overall heat treatment process to form iron-nickel diffusion layers with significantly different temperatures on both sides of the steel strip, thereby effectively improving the corrosion resistance of the pre-nickel-plated steel strip and pre-nickel-plated products, such as battery shells. At the same time, by optimizing the heat treatment environment and parameters, it is further ensured that the bonding force of the heat-treated iron-nickel diffusion layer is stronger and there is no "iron leakage" phenomenon, thereby improving the safety of use and service performance of the pre-nickel-plated products.

[0034] In the utility model, the single-sided preheating treatment is completed by cooling the thin surface of the pre-nickel-plated steel strip and heating the thick surface, thereby forming a temperature gradient with a large temperature difference in the pre-nickel-plated steel strip. According to Fick's law, temperature is a decisive factor affecting the diffusion rate and diffusion flux. When the diffusion coefficient of the material is the same, the higher the temperature, the higher the diffusion rate. The temperature difference between the two pre-nickel-plated layers leads to a difference in diffusion rate, and within the same diffusion time, the difference in diffusion rate also leads to a difference in diffusion flux. The diffusion flux of the nickel layer on the high-temperature surface is greater, so the thickness of the iron-nickel alloy layer formed is thicker. Similarly, the thickness of the iron-nickel alloy layer finally formed on the low-temperature surface is thinner. By using this device, a pre-nickel-plated steel strip with different thicknesses of iron-nickel alloy layers on both sides can be formed during a single thermal diffusion treatment.

[0035] See also Figure 4 In this embodiment, the pressure regulating mechanism 3 includes a support seat 12, a motor 13, a coupling 14, a screw 15, a guide column 16, a bracket 17 and a roller 18;

[0036] The motor 13 is installed on the support base 12, and the output power shaft 1301 of the motor 13 is fixed to the screw rod 15 via the coupling 14. The screw rod 15 vertically passes through the bottom of the bracket 17 in the center and is threadedly matched with the bracket 17. There are multiple guide columns 16, which are distributed in a ring shape on the support base 12 with the screw rod 15 as the center, and vertically pass through the bottom of the bracket 17. The roller 18 is horizontally rotatably installed on the top of the bracket 17. The bracket 17 has a movement stroke that drives the roller 18 to move up and down along the screw rod 15. The roller 18 is used to press and fit the pre-nickel-plated steel strip 11 to the condensation pipe 5, and a pressure sensor for real-time pressure measurement is installed on the roller 18.

[0037] In this design, the motor 13 drives the output power shaft 1301 to rotate, and under the action of the coupling 14, the screw 15 rotates synchronously with the output power shaft 1301. Under the action of the threaded engagement, the bracket 17 should rotate synchronously with the screw 15, but under the limiting action of the guide column 16, the bracket 17 cannot rotate, but rises and falls along the length direction of the screw 15, thereby driving the roller 18 on the top to rise and fall synchronously, thereby realizing the adjustment of the pressure of the pre-nickel-plated steel strip 11 by the roller 18. At the same time, the pressure sensor is used to monitor the pressure in real time and transmit it to the remote end for inspection by the technician. The pressure sensor in this application can be a standard part obtained by purchasing in the prior art.

[0038] It should be noted that the above-mentioned pressing force should be based on the premise that it does not affect the normal friction and sliding of the pre-nickel-plated steel strip 11 against the surface of the roller 18.

[0039] See also Figure 1-Figure 3 In this embodiment, there are two pressure regulating mechanisms 3, which are respectively installed at the inlet end of the preheating box 4 and the outlet end of the exhaust box 8. With this design, when the pre-nickel-plated steel strip 11 is processed in the box or in the furnace, the two pressure regulating mechanisms 3 located in the unwinding direction and the winding direction respectively press and compact it, on the one hand, ensuring that during the single-sided preheating process, the pre-nickel-plated steel strip 11 can be close to the condensation pipe 5, which is conducive to the formation of a temperature gradient in the plate, and on the other hand, ensuring that the pre-nickel-plated steel strip 11 will not be deformed in the box or in the furnace, which is conducive to the normal processing. The condensation pipe 5 described in this application uses an S-shaped elbow structure, and other structural forms can also be used, and no specific restrictions are made here.

[0040] See also Figure 1-Figure 2In this embodiment, the heating furnace 7 has multiple furnace walls, which are made of heat-insulating materials, connected one by one, and located between the preheating box 4 and the exhaust box 8, and two rows of heating tubes 701 are installed in the upper and lower intervals inside the heating furnace 7, and the pre-nickel-plated steel strip 11 passes through the two rows of heating tubes 701, and the heating furnace 7 is installed with an electric control box 702 electrically connected to the heating tubes 701. With this design, the heating furnace 7 can be selected as a resistance heating furnace, which is usually set to 3 to 8 sections, and other forms can also be selected, which is not specifically limited here. In this application, the heating temperature in the heating furnace 7 and the speed at which the pre-nickel-plated steel strip 11 travels in the heating furnace 7 are both controllable and adjustable. In this way, the pre-nickel-plated steel strip 11 that has undergone single-sided preheating treatment and formed a temperature gradient inside the plate has completed thermal diffusion treatment.

[0041] See also Figure 1-Figure 2 In this embodiment, an exhaust channel 801 is provided on the exhaust box 8, and the exhaust channel 801 is used to exhaust the mixed gas after passing through the preheating box 4 and the multiple heating furnaces 7. The exhaust channel 801 is connected to the exhaust pump, and the intake channel 401 is connected to the intake pump. The exhaust speed of the exhaust pump and the intake speed of the intake pump are both controllable and always equal. With this design, the high-temperature gas introduced into the preheating box 4 by the intake channel 401 can be selected from gases that can prevent the pre-nickel-plated steel strip 11 from being oxidized, such as nitrogen, inert gas, etc., and no specific restrictions are made here;

[0042] It should be noted that during operation, high-temperature gas should be introduced into the preheating box 4 in advance, the air in the box should be fully discharged in advance, and it should be ensured that the air inlet channel 401 is always ventilated to the preheating box 4.

[0043] See also Figure 1-Figure 2 In this embodiment, a cooling gas channel 901 is provided on the cooling box 9, and the cooling gas channel 901 is used to pass cooling gas to prevent oxidation of the pre-nickel-plated steel strip 11, and the flow rate of the cooling gas is controllable. With this design, since the temperature of the pre-nickel-plated steel strip 11 after the heating treatment in the heating furnace 7 is relatively high, it needs to be cooled before it can be rolled up. The cooling gas is selected to be a gas that can prevent oxidation of the pre-nickel-plated steel strip 11, such as nitrogen, inert gas, etc., and no specific restrictions are made here, and the flow rate of the cooling gas is positively correlated with the winding and unwinding speed of the unwinding mechanism 1 or the winding mechanism 10. The higher the winding and unwinding speed of the pre-nickel-plated steel strip 11, the greater the flow rate of the cooling gas, and vice versa;

[0044] It should be noted that during operation, cooling gas should be introduced into the cooling box 9 in advance, the air in the box should be fully discharged in advance, and it should be ensured that the cooling gas channel 901 is always ventilated to the cooling box 9.

[0045] See also Figure 1-Figure 2 In this embodiment, the inlet / outlet end of the preheating box 4, the inlet / outlet end of the heating furnace 7, the inlet / outlet end of the exhaust box 8 and the inlet / outlet end of the cooling box 9 are all at the same horizontal height, and the pre-nickel-plated steel strip 11 horizontally passes through the preheating box 4, the plurality of heating furnaces 7, the exhaust box 8 and the cooling box 9 in sequence. This design ensures that the pre-nickel-plated steel strip 11 is always in a horizontally stretched state during the processing and maintains a certain tension. At the same time, the unwinding end of the unwinding mechanism 1 in the unwinding direction and the winding end of the winding mechanism 10 in the winding direction should also be maintained at the same horizontal height as the above-mentioned inlet / outlet ends to avoid deformation or damage to the plate during the unwinding or winding process of the pre-nickel-plated steel strip 11.

[0046] See also Figure 1 In this embodiment, it also includes a tensioning wheel mechanism 2, which has two tensioning wheel mechanisms 2, which are respectively installed at the output end of the unwinding mechanism 1 and the input end of the winding mechanism 10. The pre-nickel-plated steel strip 11 passes through the tensioning wheel mechanism 2, and the tensioning wheel mechanism 2 is used to adjust the tensioning force on the pre-nickel-plated steel strip 11. In this design, the tensioning wheel mechanism 2 is respectively installed in the unwinding direction and the winding direction. By adjusting the tensioning force of the tensioning wheel mechanism 2, it is ensured that the pre-nickel-plated steel strip 11 is kept in a tensioned state during the treatment process, thereby improving the effect of the single-sided preheating treatment and the thermal diffusion treatment.

[0047] In summary, the utility model carries out a single-sided preheating treatment process for pre-nickel-plated steel strips with non-uniform thickness on both sides, forms a temperature gradient with a large temperature difference in the steel strip, and then carries out an overall heat treatment process to form iron-nickel diffusion layers with significant differences on both sides of the steel strip, thereby effectively improving the corrosion resistance of the pre-nickel-plated steel strips and pre-nickel-plated products, such as battery shells. At the same time, by optimizing the heat treatment environment and parameters, it is further ensured that the bonding force of the heat-treated iron-nickel diffusion layer is stronger and there is no "iron leakage" phenomenon, thereby improving the safety of use and service performance of the pre-nickel-plated products.

[0048] It should be understood that the examples and implementation modes described herein are for illustrative purposes only and are not intended to limit the present invention. Those skilled in the art may make various modifications or changes based on the examples and implementation modes. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A double-sided asynchronous thermal diffusion device for a pre-nickel-plated steel strip, comprising a pre-nickel-plated steel strip (11), characterized in that: It also includes an unwinding mechanism (1), a preheating box (4), a heating furnace (7), an exhaust box (8), a cooling box (9) and a winding mechanism (10) which are sequentially arranged; The pre-nickel-plated steel strip (11) is a double-sided unequal thickness steel strip, with one side being a thick side and the other side being a thin side, and is wound on the unwinding mechanism (1), and after the free end of the pre-nickel-plated steel strip (11) is drawn out, it passes through the preheating box (4), the heating furnace (7), the exhaust box (8) and the cooling box (9) in sequence, and enters the winding mechanism (10); The interior of the preheating box (4) is provided with condensation pipes (5) and gas guide plates (6) arranged horizontally and in parallel with each other at intervals. Condensate liquid flows in the condensation pipe (5). The air inlet channel (401) of the preheating box (4) points to the gas guide plate (6) and passes high-temperature gas. The free end of the pre-nickel-plated steel strip (11) passes horizontally between the condensation pipe (5) and the gas guide plate (6), with the thin surface facing the condensation pipe (5) and the thick surface facing the gas guide plate (6). The pre-nickel-plated steel strip (11) forms a temperature gradient in the preheating box (4); It also comprises a pressure regulating mechanism (3), and the pressure regulating mechanism (3) is used to press the pre-nickel-plated steel strip (11) and make it fit onto the condensation pipe (5).

2. The double-sided asynchronous thermal diffusion device for pre-nickel-plated steel strip according to claim 1, characterized in that: The pressure regulating mechanism (3) comprises a support seat (12), a motor (13), a coupling (14), a screw rod (15), a guide column (16), a bracket (17) and a roller shaft (18); The motor (13) is mounted on the support seat (12); the output power shaft (1301) of the motor (13) is fixed to the screw (15) via the coupling (14); the screw (15) vertically passes through the bottom of the bracket (17) in the center and is threadedly matched with the bracket (17); the guide pillars (16) are provided in plurality, which are respectively distributed in a ring shape on the support seat (12) with the screw (15) as the center of the circle and vertically pass through the bottom of the bracket (17); the roller (18) is horizontally rotatably mounted on the top of the bracket (17); the bracket (17) has a movement stroke for driving the roller (18) to move up and down along the screw (15); the roller (18) is used to press the pre-nickel-plated steel strip (11) and fit it to the condensation pipe (5); and a pressure sensor for real-time pressure measurement is installed on the roller (18).

3. The double-sided asynchronous thermal diffusion device for pre-nickel-plated steel strip according to claim 1, characterized in that: The pressure regulating mechanisms (3) are provided with two, which are respectively installed at the inlet end of the preheating box (4) and the outlet end of the exhaust box (8).

4. The double-sided asynchronous thermal diffusion device for pre-nickel-plated steel strip according to claim 1, characterized in that: The heating furnace (7) has a plurality of furnace walls, all of which are made of heat-insulating materials, are connected to each other, and are located between the preheating box (4) and the exhaust box (8). Two rows of heating tubes (701) are installed in the upper and lower parts of the heating furnace (7). The pre-nickel-plated steel strip (11) passes through between the two rows of heating tubes (701). An electric control box (702) electrically connected to the heating tubes (701) is installed on the heating furnace (7).

5. The double-sided asynchronous thermal diffusion device for pre-nickel-plated steel strip according to claim 1, characterized in that: The exhaust box (8) is provided with an exhaust channel (801), and the exhaust channel (801) is used to exhaust the mixed gas after passing through the preheating box (4) and the plurality of heating furnaces (7). The exhaust channel (801) is connected to an exhaust pump, and the intake channel (401) is connected to an intake pump. The exhaust speed of the exhaust pump and the intake speed of the intake pump are both controllable and always equal.

6. The double-sided asynchronous thermal diffusion device for pre-nickel-plated steel strip according to claim 1, characterized in that: The cooling box (9) is provided with a cooling gas channel (901), and the cooling gas channel (901) is used to pass cooling gas to prevent oxidation of the pre-nickel-plated steel strip (11), and the flow rate of the cooling gas is controllable.

7. The double-sided asynchronous thermal diffusion device for pre-nickel-plated steel strip according to claim 1, characterized in that: The inlet / outlet ends of the preheating box (4), the inlet / outlet ends of the heating furnace (7), the inlet / outlet ends of the exhaust box (8) and the inlet / outlet ends of the cooling box (9) are all at the same horizontal height, and the pre-nickel-plated steel strip (11) horizontally passes through the preheating box (4), the plurality of heating furnaces (7), the exhaust box (8) and the cooling box (9) in sequence.

8. The double-sided asynchronous thermal diffusion device for pre-nickel-plated steel strip according to claim 1, characterized in that: It also includes a tensioning wheel mechanism (2), wherein the tensioning wheel mechanism (2) has two members, which are respectively installed at the output end of the unwinding mechanism (1) and the input end of the rewinding mechanism (10), and the pre-nickel-plated steel strip (11) passes through the tensioning wheel mechanism (2). The tensioning wheel mechanism (2) is used to adjust the tensioning force on the pre-nickel-plated steel strip (11).

Images