Battery case production line

Abstract

The utility model provides a battery case production line, which belongs to the technical field of battery production, and comprises a feeding guide roller frame, a horizontal roller frame, a fine forming roller frame, an extrusion forming roller frame, an outer scraping rack, a shaping roller frame and a straightening roller frame which are sequentially arranged along the forming and moving direction of a battery case, a feeding and oiling device is arranged in front of the feeding guide roller frame, and a cooling water tank is arranged between the extrusion forming roller frame and the outer scraping rack. The aluminum strip can be directly bent to form the square tube, and an aluminum blank does not need to be changed into a vertical ellipse and then is shaped, or a flat tube is adopted for forming. The aluminum strip and the square tube can be formed on one production line, so that the production quality of the battery shell can be improved; and moreover, the feeding and oiling device is arranged, so that the two surfaces of the aluminum strip can be oiled, the two surfaces of the aluminum strip are protected by oil films, the risk that the aluminum strip is scratched in the subsequent forming process can be avoided, and the product quality of the battery shell can be improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery production, and specifically relates to a battery shell production line. Background Art

[0002] The development of new energy vehicles is unstoppable. In the field of pure electric vehicles, lithium iron phosphate batteries and ternary lithium batteries are currently the two mainstream battery technology routes in the global electric vehicle industry. However, it is well known that the higher the energy density, the higher the safety protection level of the battery. The safety of the battery is the bottleneck of the industry's development. The lithium iron phosphate battery flattens the shape of the battery cell so that the battery length can reach 2500mm, which is more than 10 times the energy density of traditional lithium iron phosphate batteries. The single cell of the power battery is flat (height greater than 90mm), narrow (height greater than 90mm), and long. The structure of the module is retained. Multiple blade single cells are bundled into modules and then combined into batteries, which greatly improves the efficiency of cell reorganization, which means that the energy density of the battery pack can be increased.

[0003] Therefore, the battery shell is usually made of aluminum alloy material, and is a flat, narrow, long rectangular battery aluminum shell. The existing new energy vehicle power battery aluminum shell square tube manufacturing equipment and process have at least the following defects: the composite forming of the aluminum blank and the flat tube forming steps are too scattered and the continuity is poor, resulting in unstable molded products, so this needs to be improved. Utility Model Content

[0004] The embodiment of the utility model provides a battery shell production line, which directly bends and extrude the aluminum strip into a square battery shell through a series of operations, thereby solving the problems of poor production continuity and unstable quality of molded products of battery shells with large aspect ratio, soft material and thin thickness.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: to provide a battery shell production line, including: a feed guide roller frame, a horizontal roller frame, a fine forming roller frame, an extrusion forming roller frame, an external scraper frame, a shaping roller frame, and an upright roller frame arranged in sequence along the battery shell forming movement direction; a feeding oiling device is arranged in front of the feed guide roller frame, and a cooling water tank is arranged between the extrusion forming roller frame and the external scraper frame.

[0006] In one achievable manner, the feeding oiling device comprises an oiling roller frame and two oiling rollers rotatably disposed on the oiling roller frame, the oiling rollers are arranged up and down, and the oiling rollers are coated with an oiling layer that abuts against the surface of the fed aluminum strip.

[0007] In one achievable manner, oil outlet holes are dispersedly arranged on the circumference of the oil coating roller.

[0008] In one achievable manner, a water wiping device for wiping the outer surface of the square tube is provided between the outer scraper frame and the shaping roller frame.

[0009] In one achievable manner, the water wiping device includes a water wiping box, the water wiping box is provided with a through hole extending along the battery shell forming movement direction, a water wiping sponge or a water wiping cloth is provided in the water wiping box, and the water wiping sponge or the water wiping cloth surrounds the through hole.

[0010] In one feasible manner, an inspection roller frame is further provided between the water wiping device and the shaping roller frame, and a transverse slide rail is provided at the bottom of the inspection roller frame, and the extension direction of the transverse slide rail is consistent with the direction of movement of the battery shell molding.

[0011] In a feasible manner, a water receiving trough is further provided between the inspection roller frame and the shaping roller frame, a water collecting trough is formed between the transverse slide rails, and the water receiving trough is connected to the water collecting trough.

[0012] In one achievable manner, it comprises a plurality of groups of the horizontal roller frames arranged in sequence, and deflection-correcting vertical roller frames are arranged between the horizontal roller frames.

[0013] In one achievable manner, the upright roller frames include at least three groups, and the bottom of the upright roller frames is provided with a longitudinal slide rail perpendicular to the battery shell forming movement direction.

[0014] Compared with the prior art, the battery shell production line provided by the utility model has the following beneficial effects: the square tube production line that directly squares steel strips is creatively transferred to the production of battery shells, the two sides of the aluminum strip are initially folded and formed by a horizontal roller frame, the two sides of the battery shell are formed by a fine forming roller frame, and then the two folded edges are butted and melted and welded together to form the top surface of the battery shell through hot extrusion by an extrusion forming roller frame, and then the excess slag at the butt joint is scraped and cleaned by an external scraper frame, and then the square tube in the shape of a battery shell with higher precision is obtained through the shaping roller frame and the vertical roller frame, and finally the battery shell can be formed by cutting.

[0015] The present application can directly bend the aluminum strip to form a square tube, without the need to use aluminum blanks to form a vertical ellipse, and then perform shaping, or use flat tubes for forming. From aluminum strip to square tube, it can be formed on a production line, which can improve the production quality of battery shells; moreover, the present application has been improved according to the characteristics of the battery shell aluminum material being soft, the battery shell having a large aspect ratio and thin thickness, especially before the aluminum strip enters the feed guide roller frame, a feeding oiling device is provided, which can apply oil to both surfaces of the aluminum strip. The two surfaces of the aluminum strip are protected by an oil film, which can avoid the risk of the aluminum strip being scratched during the subsequent forming process, and is also conducive to improving the product quality of the battery shell; and the cooling water tank after the extrusion forming roller frame does not need to be too long, because the battery shell is thin and cools down faster than the steel strip, which can save the land area occupied by the production line and save space. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the structure of a battery shell production line provided by an embodiment of the utility model;

[0017] Figure 2 A schematic diagram of the structure of the first section of a battery shell production line provided by an embodiment of the utility model;

[0018] Figure 3 A schematic diagram of the structure of the second section of a battery shell production line provided by an embodiment of the utility model;

[0019] Figure 4 A schematic diagram of the structure of the third section of the battery shell production line provided by an embodiment of the utility model;

[0020] Figure 5 A schematic diagram of the structure of the fourth section of the battery shell production line provided by an embodiment of the utility model;

[0021] Figure 6 A schematic diagram of the structure of the fifth section of a battery shell production line provided by an embodiment of the utility model;

[0022] Figure 7 A schematic diagram of the structure of the feeding oiling device provided in the embodiment of the utility model;

[0023] Figure 8 for Figure 7 A side view schematic diagram of the feeding oiling device is provided;

[0024] Description of reference numerals:

[0025] 1. Feeding oiling device; 101. Oiling roller; 102. Oiling layer; 2. Feeding guide roller frame; 3. Horizontal roller frame; 4. Vertical roller frame for correcting deviation; 5. Fine forming roller frame; 6. Extrusion forming roller frame; 7. Cooling water trough; 8. External scraper frame; 9. Water wiping device; 10. Repair roller frame; 11. Water receiving trough; 12. Shaping roller frame; 13. Vertical roller frame for adjusting vertical roller; 14. Flaw detection device; 15. Up and down bending roller frame; 16. Length measuring and counting machine. DETAILED DESCRIPTION

[0026] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0027] Please also read Figures 1 to 8 The battery shell production line provided by the utility model is now described. The battery shell production line comprises a feed guide roller frame 2, a horizontal roller frame 3, a fine forming roller frame 5, an extrusion forming roller frame 6, an external scraper frame 8, a shaping roller frame 12, and an upright roller frame 13 arranged in sequence along the battery shell forming moving direction; a feeding oiling device 1 is arranged in front of the feed guide roller frame 2, and a cooling water tank 7 is arranged between the extrusion forming roller frame 6 and the external scraper frame 8.

[0028] Compared with the prior art, the battery shell production line provided by the utility model has the following beneficial effects: the square tube production line that directly squares steel strips is creatively transferred to the production of battery shells, the two sides of the aluminum strip are initially folded and formed by the horizontal roller frame 3, the two sides of the battery shell are formed by the fine forming roller frame 5, and then the two folded edges are hot-extruded by the extrusion forming roller frame 6, so that the two folded edges are butted and melt-welded together to form the top surface of the battery shell, and then the excess slag in the butt joint is scraped and cleaned by the external scraper frame 8, and then the square tube in the shape of a battery shell with higher precision is obtained after being sorted by the shaping roller frame 12 and the upright roller frame 13, and finally the battery shell can be formed by cutting.

[0029] The present application can directly bend the aluminum strip to form a square tube, without the need to use aluminum blanks to form a vertical ellipse, and then perform shaping, or use flat tubes for forming. From aluminum strip to square tube, it can be formed on a production line, which can improve the production quality of battery shells; moreover, the present application is improved according to the characteristics of the battery shell aluminum material being soft, the battery shell having a large aspect ratio and thin thickness, especially before the aluminum strip enters the feed guide roller frame 2, a feeding oiling device 1 is provided, which can apply oil to the two surfaces of the aluminum strip, and the two surfaces of the aluminum strip are protected by an oil film, which can avoid the risk of the aluminum strip being scratched during the subsequent forming process, and is also conducive to improving the product quality of the battery shell; and the cooling water tank 7 behind the extrusion forming roller frame 6 does not need to be too long, because the battery shell is thin and cools down faster than the steel strip, which can save the land area occupied by the production line and save space.

[0030] The feed guide roller frame 2 is provided with two upper and lower guide rollers, the roller axes of the two guide rollers are perpendicular to the direction of movement of the battery shell forming, and the aluminum strip passes between the two guide rollers. One of the guide rollers is connected to the motor, and the shell rotates actively, driving the aluminum strip to be transmitted backward.

[0031] The principle of the horizontal roller frame 3 is the same as that of the feed guide roller frame 2, and is also provided with two horizontal rollers arranged up and down, wherein an annular groove is provided in the circumferential direction of the horizontal roller to facilitate the folding of both sides of the aluminum strip.

[0032] The fine forming roller frame 5 is a four-roller frame, which can preliminarily form the four sides of the square tube; the extrusion forming roller frame 6 can be a five-roller extrusion roller frame, which connects the two folded edges together by butt-melting.

[0033] The external scraper frame 8 is used to scrape off the slag formed during melting to ensure the appearance quality of the battery shell.

[0034] There are multiple groups of shaping rollers 12, which gradually shape the four sides of the formed square tube or battery shell in sequence to improve the flatness of the four sides of the battery shell. The shaping roller 12 can be a four-roller roller frame, or a sizing roller frame.

[0035] The roller axis of the vertical roller frame 13 is in the vertical direction, which straightens the overall length direction of both sides of the battery shell, improves the overall straightness of the battery shell, and ensures the quality of the product.

[0036] Behind the upright roller frame 13, there are also provided a flaw detection device 14 for detecting defects of the square tube, an upper and lower bending roller frame 15 for straightening the upper and lower surfaces of the square tube, and a length measuring and counting machine 16. Of course, a cutting device is also provided in sequence to cut the formed square tube into a battery shell.

[0037] In some embodiments, Figure 1 , Figure 2 , Figure 7 and Figure 8As shown, the feeding oiling device 1 comprises an oiling roller frame and two oiling rollers 101 rotatably arranged on the oiling roller frame, the oiling rollers 101 are arranged up and down, and the oiling rollers 101 are coated with an oiling layer 102 that abuts against the surface of the fed aluminum strip. When the aluminum strip passes between the oiling rollers 101, an oil film can be applied on both sides.

[0038] In some embodiments, oil outlet holes (not shown) are dispersedly arranged on the circumference of the oiling roller 101. The oiling roller 101 is provided with an oil storage cavity or an oil pipe, so that the lubricating oil can be continuously discharged from the oil outlet holes to the oil coating layer.

[0039] The oil coating layer 102 may be a sponge, a flexible cloth or a felt wrapped on an oil coating roller.

[0040] In some embodiments, Figure 1 and Figure 4 As shown, a water wiping device 9 for wiping the outer surface of the square tube is provided between the outer scraper frame 8 and the shaping roller frame 12. The part before the square tube is formed to the extrusion forming roller frame 6 is waterless forming, and only lubricating oil is used to protect the steel belt, and as the forming proceeds, the lubricating oil will also evaporate and dissipate; and after extrusion forming, the battery shell is relatively hot and needs to be cooled, that is, after passing through the cooling water tank 7, water will adhere to the outer surface of the battery shell, which will have a certain impact on the forming accuracy in the subsequent forming and shaping process. Therefore, after the battery shell is water-cooled, the surface moisture needs to be wiped off as soon as possible.

[0041] In some embodiments, Figure 1 and Figure 4 As shown, the water wiping device 9 includes a water wiping box, on which a through hole is provided that passes through along the battery shell forming moving direction, and a water wiping sponge or a water wiping cloth is provided in the water wiping box, and the water wiping sponge or the water wiping cloth is arranged to surround the through hole.

[0042] In some embodiments, Figure 1 and Figure 4 As shown, a maintenance roller frame 10 is also provided between the water wiping device 9 and the shaping roller frame 12. A transverse slide rail is provided at the bottom of the maintenance roller frame 10. The extension direction of the transverse slide rail is consistent with the direction of the battery shell forming movement. The maintenance roller frame 10 has similar features to the guide roller frame, including two maintenance rollers arranged up and down to support the initially formed battery shell. Since the aluminum strip is sealed into a square tube after a series of deformations through the extrusion forming roller frame 6, after the initial forming, it is necessary to check the forming quality and eliminate quality defects; therefore, when inspection is required, the maintenance roller frame 10 is moved backward along the transverse slide rail to keep the maintenance roller frame 10 away from the water wiping device 9, and a distance is left between the two for easy maintenance. When maintenance is not required, the maintenance roller frame 10 can be moved closer to the water wiping device 9 to support and guide the initially formed square tube.

[0043] In some embodiments, Figure 1 and Figure 4 As shown, a water receiving trough 11 is also provided between the repair roller frame 10 and the shaping roller frame 12, and a water collecting trough is formed between the transverse slide rails, and the water receiving trough 11 is connected to the water collecting trough. The wiped water will flow downward, converge into the water trough and flow into the water receiving trough 11, and the water receiving trough 11 is connected to the drainage pipe to drain the accumulated water. Among them, the bottom of the wiping water box is connected to the water collecting trough.

[0044] In some embodiments, Figure 1 and Figure 2 As shown, it includes multiple groups of horizontal roller frames 3 arranged in sequence, and a straightening vertical roller frame 4 is arranged between the horizontal roller frames 3. After multiple sets of folding of the horizontal roller frames 3, the folding angle is gradually changed, so that the folding edges on both sides are gradually close to form, and the straightening vertical roller frame 4 performs some straightening after each folding to avoid cumulative errors in the subsequent sequence and affect the quality of the finished product.

[0045] In some embodiments, Figure 1 and Figure 6 As shown, the upright roller frame 13 includes at least three groups, and the bottom of the upright roller frame 13 is provided with a longitudinal slide rail perpendicular to the battery shell forming movement direction.

[0046] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery shell production line, characterized in that: include: A feed guide roller frame (2), a horizontal roller frame (3), a fine forming roller frame (5), an extrusion forming roller frame (6), an external scraper frame (8), a shaping roller frame (12), and an upright adjustment roller frame (13) are sequentially arranged along the battery shell forming moving direction; a feeding oiling device (1) is arranged in front of the feed guide roller frame (2), and a cooling water tank (7) is arranged between the extrusion forming roller frame (6) and the external scraper frame (8).

2. The battery shell production line according to claim 1, characterized in that: The feeding oiling device (1) comprises an oiling roller frame and two oiling rollers (101) rotatably arranged on the oiling roller frame, wherein the oiling rollers (101) are arranged up and down, and the oiling rollers (101) are coated with an oiling layer (102) that abuts against the surface of the fed aluminum strip.

3. The battery shell production line according to claim 2, characterized in that: Oil outlet holes are dispersedly arranged on the circumference of the oil coating roller (101).

4. The battery shell production line according to claim 1, characterized in that: A water wiping device (9) for wiping the outer surface of the square tube is provided between the outer scraper frame (8) and the shaping roller frame (12).

5. The battery shell production line according to claim 4, characterized in that: The water wiping device (9) comprises a water wiping box, on which a through hole is provided which passes through along the battery shell forming moving direction, and a water wiping sponge or a water wiping cloth is provided in the water wiping box, and the water wiping sponge or the water wiping cloth surrounds the through hole.

6. The battery shell production line according to claim 4, characterized in that: An inspection roller frame (10) is also provided between the water wiping device (9) and the shaping roller frame (12), and a transverse slide rail is provided at the bottom of the inspection roller frame (10), wherein the extension direction of the transverse slide rail is consistent with the direction of movement of the battery shell molding.

7. The battery shell production line according to claim 6, characterized in that: A water receiving trough (11) is also provided between the repair roller frame (10) and the shaping roller frame (12), a water collecting trough is formed between the transverse slide rails, and the water receiving trough (11) is connected to the water collecting trough.

8. The battery shell production line according to claim 1, characterized in that: It comprises a plurality of groups of horizontal roller frames (3) arranged in sequence, and deflection-correcting vertical roller frames (4) are arranged between the horizontal roller frames (3).

9. The battery shell production line according to claim 1, characterized in that: The upright roller frame (13) comprises at least three groups, and the bottom of the upright roller frame (13) is provided with a longitudinal slide rail perpendicular to the battery shell forming movement direction.

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