A battery-grade nickel strip production process without acid washing

Abstract

The present invention relates to the technical field of nickel strip production, and discloses a battery-grade nickel strip production pickling-free process, comprising the following steps: hood annealing the semi-finished nickel strip; cold rolling the semi-finished nickel strip after hood annealing; until the thickness of the semi-finished nickel strip meets the target specification after one cold rolling, the semi-finished nickel strip that meets the standard of one cold rolling is hood annealed again and then polished and rusted by a grinding mechanism; after the semi-finished nickel strip after grinding is cold rolled to a near-finished product, it is placed in a bright annealing furnace for annealing; the near-finished nickel strip after bright annealing is finish rolled to a finished nickel strip. The present invention ensures that the quality requirements of the target specification thickness are met through multiple cold rolling, and takes grinding measures to remove the oxide layer on the surface of the nickel strip before the last cold rolling, thereby using the oxide film generated on the surface of the nickel strip after annealing as a protective film, reducing the amount of nickel material that is re-oxidized during the second annealing, effectively saving the strip raw material, and making full use of the strip raw material.

Description

Technical Field

[0001] The invention relates to the technical field of nickel strip production, in particular to an acid-wash-free production process for battery-grade nickel strips. Background Art

[0002] Nickel strip, as a conductor material, is mostly used to connect the positive and negative electrodes of battery cells with battery protection boards, etc. The finished product requires the strip to be straight, with both sides cut flush, without burrs, cracks and curling. Its production process is generally divided into: batching, smelting, milling / planing, hot rolling, hood annealing, pickling, cold rolling, bright annealing, finishing rolling, stripping, inspection, packaging and warehousing. Among them, in the pickling stage, acid is used to clean the surface oxides of the strip produced in the high-temperature annealing stage, otherwise it will seriously affect the surface quality of the finished strip. However, the pickling process will produce a large amount of wastewater, which is difficult to handle and costly. For this reason, Chinese Patent No. CN201410116915.9 proposes a pickling-free process for nickel strip production, which uses physical brushing and multiple annealing methods to remove the oxide layer, which can remove the oxides and dirt on the surface of the nickel strip without damaging the surface of the nickel material.

[0003] However, the process is to repeatedly hood anneal, clean and cold roll the semi-finished nickel strip until it is cold rolled to the finished product, then bright anneal and finish rolling. In the processing of the semi-finished nickel strip, the continuous cleaning and cold rolling ensures the precision and quality of continuous processing to a certain extent. However, it consumes more strips. Each cleaning and annealing process consumes the nickel material on the surface of the strip, resulting in unnecessary waste of the substrate. After bright annealing, the finish rolling is directly carried out, which will inevitably cause oxides on the surface of the finished nickel strip, affecting the resistance and welding quality of the finished nickel strip. Therefore, an improved pickling-free process for nickel strip production is proposed to solve the above problems. Summary of the invention

[0004] In view of the shortcomings of the existing nickel strip production process mentioned in the background technology, the present invention provides a battery-grade nickel strip production process without acid washing, which has the advantages of full utilization of nickel strip raw materials and high quality of finished products, and solves the problems raised in the above background technology.

[0005] The present invention provides the following technical solution: a battery-grade nickel strip production acid-free process, comprising the following steps:

[0006] S1, hood annealing the semi-finished nickel strip;

[0007] S2, cold rolling the semi-finished nickel strip after the hood annealing;

[0008] S3, executing steps S1 and S2 again until the thickness of the semi-finished nickel strip meets the target specification after one cold rolling, and executing step S4;

[0009] S4, performing hood annealing on the semi-finished nickel strip that has reached the standard after the first cold rolling, and then grinding and removing rust by using a grinding mechanism;

[0010] S5, cold-rolling the polished semi-finished nickel strip to a nearly finished product, and then placing it in a bright annealing furnace for annealing;

[0011] S6. Finish rolling the nearly finished nickel strip after bright annealing to a finished nickel strip.

[0012] Preferably, in step S2, the semi-finished nickel strip is cold rolled to 1 / 2 of the thickness of the original nickel strip.

[0013] Preferably, in step S5, the nearly finished nickel strip is placed in a bright annealing furnace, and before heating in the furnace, a protective gas is filled into the furnace.

[0014] Preferably, the protective gas may be an inert gas or nitrogen.

[0015] Preferably, in step S4, the grinding mechanism includes an L-shaped mounting plate, a grinding wheel I, a grinding wheel II, a driven wheel, a conical driving wheel, a constant speed transmission wheel and a conical transmission wheel, and two folding plate sides of the L-shaped mounting plate are respectively provided with two relatively vertically arranged grinding wheels I and II, and the central axes of the grinding wheels I and II pass through the L-shaped mounting plate and are respectively fixedly sleeved with the driven wheel and the conical driving wheel, and the constant speed transmission wheel is meshed on the same horizontal plane of the driven wheel, and a conical transmission wheel is provided below the constant speed transmission wheel, and the conical transmission wheel is coaxial with the constant speed transmission wheel and meshed with the conical driving wheel, and the spindle of the grinding wheel II is connected to the output shaft of the driving motor.

[0016] Preferably, the central axis of the grinding wheel I and the central axis of the grinding wheel II are not on the same vertical plane, and the central axis of the grinding wheel II and the central axis of the constant speed transmission wheel are on the same vertical plane.

[0017] Preferably, the number of teeth of the constant speed transmission wheel is the same as the number of teeth of the driven wheel.

[0018] Preferably, the number of teeth on the conical transmission wheel is half the number of teeth on the conical drive wheel.

[0019] Preferably, the grinding mechanism is provided with two groups, and the two groups of grinding structures are arranged centrally symmetrically on the vertical plane and arranged front to back in the longitudinal direction.

[0020] The present invention has the following beneficial effects:

[0021] 1. The present invention ensures that the quality requirements of the target thickness are met through multiple cold rolling, and takes grinding measures to remove the oxide layer on the surface of the nickel strip before the last cold rolling. Therefore, the oxide film generated on the surface of the nickel strip after annealing is used as a protective film, which reduces the amount of nickel material that is re-oxidized during re-annealing, effectively saves the strip raw material, and makes full use of the strip raw material.

[0022] 2. The present invention uses grinding wheels I and II that are relatively vertically arranged in a single grinding mechanism, and two groups of grinding mechanisms are centrally symmetrically arranged. Each group of grinding wheels I and II are longitudinally staggered, so that the grinding mechanism can achieve a grinding effect on the four circumferential sides of the nickel strip, thereby ensuring that the nickel strip achieves a metallic gloss effect on the surface of the nickel strip after one grinding. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the grinding mechanism structure of the present invention;

[0024] Figure 2 For the present invention Figure 1 A top view of

[0025] Figure 3 It is a front view of the combination of two grinding mechanisms of the present invention.

[0026] In the figure: 1. L-shaped mounting plate; 2. Grinding wheel I; 3. Grinding wheel II; 4. Driven wheel; 5. Conical driving wheel; 6. Constant speed transmission wheel; 7. Conical transmission wheel. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] To facilitate the understanding of this application, it should be noted that the "horizontal" and "X-axis" mentioned in this application are in the same direction, and the "vertical plane" and "Y-axis" are in the same direction, and both are based on Figure 1 The plane of Figure 1 is the reference direction; "longitudinal" is the line perpendicular to the plane reference direction of Figure 1. Figure 1 The X-axis and Y-axis, that is Figure 2 The Y-axis direction in the strip; the "circumferential direction" of the strip refers to the strip with a rectangular cross-section, which removes the four sides of the two end faces of the strip.

[0029] See also Figure 1-3 , a battery-grade nickel strip production acid-free process, comprising the following steps:

[0030] S1, hood annealing the semi-finished nickel strip;

[0031] S2, cold rolling the semi-finished nickel strip after the hood annealing;

[0032] S3, executing steps S1 and S2 again until the thickness of the semi-finished nickel strip meets the target specification after one cold rolling, and executing step S4;

[0033] S4, performing hood annealing on the semi-finished nickel strip that has reached the standard after the first cold rolling, and then grinding and removing rust by using a grinding mechanism;

[0034] S5, cold-rolling the polished semi-finished nickel strip to a nearly finished product, and then placing it in a bright annealing furnace for annealing;

[0035] S6. Finish rolling the nearly finished nickel strip after bright annealing to a finished nickel strip.

[0036] During the repetition of steps S1 to S3, the oxide on the surface of the nickel strip always remains on the surface of the strip. The remaining oxide will prevent further oxidation of the strip surface. As the thickness of the strip gradually becomes thinner, its surface area increases, and a small amount of new strip will be exposed and oxidized. Overall, compared with polishing after each annealing, more strip raw materials will be saved to avoid waste of strip.

[0037] Among them, in step S2, the semi-finished nickel strip is cold rolled to 1 / 2 of the thickness of the original nickel strip. Generally speaking, the initial semi-finished nickel strip thickness is about 5-6 mm, and the target nickel strip thickness is about 0-1 mm. Therefore, the thickness changes by 1 / 2 each time of cold rolling, and only 2-3 cold rollings are needed to carry out finish rolling. In this way, the quality of each annealing and cold rolling can be guaranteed, and the process accuracy requirements of the initial cold rolling stage can be reduced.

[0038] Among them, in step S5, the nearly finished nickel strip is placed in a bright annealing furnace, and before heating in the furnace, a protective gas is filled into the furnace to prevent the surface of the nickel strip from being oxidized again in the bright annealing furnace, thereby ensuring the quality and thickness accuracy requirements of the nickel strip during the process of fine rolling to the finished product.

[0039] The shielding gas may be an inert gas or nitrogen, or any high temperature resistant gas that does not chemically react with nickel.

[0040] Among them, in step S4, the grinding mechanism includes an L-shaped mounting plate 1, a grinding wheel Ⅰ2, a grinding wheel Ⅱ3, a driven wheel 4, a conical driving wheel 5, a constant speed transmission wheel 6 and a conical driving wheel 7. The two folding plate sides of the L-shaped mounting plate 1 are respectively provided with two relatively vertically arranged grinding wheels Ⅰ2 and Ⅱ3. The central axes of the grinding wheels Ⅰ2 and Ⅱ3 penetrate the L-shaped mounting plate 1 and are respectively fixedly sleeved with the driven wheel 4 and the conical driving wheel 5. The same horizontal plane of the driven wheel 4 is meshed with the constant speed transmission wheel 6. The conical driving wheel 7 is provided below the constant speed transmission wheel 6. The conical driving wheel 7 is coaxial with the constant speed transmission wheel 6 and meshed with the conical driving wheel 5. The main shaft of the grinding wheel Ⅱ3 is connected to the output shaft of the driving motor. The L-shaped mounting plate 1 can achieve displacement in the X-axis and Y-axis directions through the displacement adjustment mechanism, with an accuracy of 0.5mm. The method can adopt the traditional servo motor stepless adjustment, or it can be manually adjusted by the screw mechanism. It should be noted that the driving motor connected to the grinding wheel Ⅱ3 needs to move synchronously with the L-shaped mounting plate 1.

[0041] Among them, the central axis of grinding wheel I2 and the central axis of grinding wheel II3 are not on the same vertical plane, and the central axis of grinding wheel II3 and the central axis of constant speed drive wheel 6 are on the same vertical plane. The staggered arrangement of grinding wheel I2 and grinding wheel II3 can facilitate circumferential and all-round grinding of the strip.

[0042] The number of teeth of the constant speed transmission wheel 6 is the same as the number of teeth of the driven wheel 4 .

[0043] Among them, the number of teeth of the conical transmission wheel 7 is half of the number of teeth of the conical driving wheel 5. The rotation speed output by the driving motor is accelerated and transmitted to the grinding wheel I2 through the gear pair. Since the grinding wheel I2 is mainly used for grinding the upper and lower surfaces of the strip with a larger area, and the grinding wheel II3 is used for grinding the side of the strip with a smaller area, increasing the rotation speed of the grinding wheel I2 and adjusting the rotation speed of the grinding wheel II3 can effectively utilize the driving force of the motor and distribute it according to utility.

[0044] Among them, there are two groups of grinding mechanisms, and the two groups of grinding structures are arranged symmetrically on the vertical plane and front to back in the longitudinal direction. One group is used to grind the upper surface and side surfaces of the strip, and the other group is used to grind the lower surface and side surfaces of the strip.

[0045] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0046] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A battery-grade nickel strip production process without pickling, characterized in that: The following steps are involved: S1, hood annealing the semi-finished nickel strip; S2, cold rolling the semi-finished nickel strip after the hood annealing; S3, executing steps S1 and S2 again until the thickness of the semi-finished nickel strip meets the target specification after one cold rolling, and executing step S4; S4, performing hood annealing on the semi-finished nickel strip that meets the standards after one cold rolling, and then using a grinding mechanism to grind and remove rust; S5, cold rolling the semi-finished nickel strip after grinding to a near-finished product, and then placing it in a bright annealing furnace for annealing; S6, finishing rolling the nearly finished nickel strip after bright annealing into a finished nickel strip; In the step S2, the semi-finished nickel strip is cold rolled to 1 / 2 of the thickness of the original nickel strip; In the step S5, the nearly finished nickel strip is placed in a bright annealing furnace, and before heating in the furnace, a protective gas is filled into the furnace; The protective gas may be an inert gas or nitrogen; In step S4, the grinding mechanism comprises an L-shaped mounting plate (1), a grinding wheel I (2), a grinding wheel II (3), a driven wheel (4), a conical driving wheel (5), a constant speed transmission wheel (6) and a conical driving wheel (7); two folding plate sides of the L-shaped mounting plate (1) are respectively provided with two relatively vertically arranged grinding wheels I (2) and II (3); the central axes of the grinding wheels I (2) and II (3) pass through the L-shaped mounting plate (1) and are respectively fixedly sleeved with the driven wheel (4) and the conical driving wheel (5); the constant speed transmission wheel (6) is meshed on the same horizontal plane of the driven wheel (4); a conical driving wheel (7) is provided below the constant speed transmission wheel (6); the conical driving wheel (7) is coaxial with the constant speed transmission wheel (6) and meshed with the conical driving wheel (5); the main shaft of the grinding wheel II (3) is connected to the output shaft of the driving motor; The central axis of the grinding wheel I (2) and the central axis of the grinding wheel II (3) are not on the same vertical plane, and the central axis of the grinding wheel II (3) and the central axis of the constant speed transmission wheel (6) are on the same vertical plane; The number of teeth of the constant speed transmission wheel (6) is the same as the number of teeth of the driven wheel (4); The number of teeth of the conical transmission wheel (7) is half of the number of teeth of the conical drive wheel (5); There are two groups of grinding mechanisms, and the two groups of grinding structures are arranged symmetrically on the vertical plane and arranged front to back in the longitudinal direction.

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