Battery box assembling equipment for automobile lithium battery processing

Abstract

The invention relates to the technical field of lithium batteries, in particular to battery box assembling equipment for automobile lithium battery processing, which comprises a rack and two conveyor belts, and a pressure bearing frame is arranged below a gap between the two conveyor belts; the two first attaching assemblies are further arranged on the machine frame, the two second attaching assemblies are further arranged on the two sides of the pressure bearing frame, the film can be rapidly and accurately wrapped on the side wall of the battery box in a U shape through close fit between relative rotation of the conveying belt and the descending process of the battery box, the attaching time is shortened, and the attaching efficiency is improved. The first attaching assembly and the second attaching assembly are used for attaching the bottom and the side wall of the battery box respectively, and the second attaching assembly works alternately, so that mutual interference is avoided, and the attaching process is smoother and more efficient. By means of the mode of step-by-step pasting and alternate operation, the overall pasting time is greatly shortened, and the production efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium batteries, and in particular to battery box assembly equipment for processing automotive lithium batteries. Background Art

[0002] As a core energy storage component in the new energy sector, the processing accuracy and packaging quality of lithium batteries directly affect the safety and service life of the batteries. In the lithium battery production process, the coating process is one of the key links in the assembly of the battery box. By applying insulating films, fire-proof films and other materials to the outer wall of the battery box, the waterproof and dustproof performance and structural stability of the battery can be effectively improved. However, the lithium battery processing systems and encapsulation tooling in the existing technology generally have the defect of incomplete coating. Specifically, they can only complete partial coating of the side walls of the battery box and cannot achieve full encapsulation including the bottom, resulting in insufficient protection of the battery box.

[0003] For example, Chinese patent authorization announcement number CN112103564B discloses a lithium battery processing system, including a support mechanism, a rubber coating mechanism, a transmission mechanism, a power mechanism, a tightening mechanism, a battery box, a pressing mechanism and a battery cover mechanism. The rubber coating mechanism is connected to the middle part of the support mechanism, the transmission mechanism is connected to the rubber coating mechanism, the power mechanism is connected to the upper part of the support mechanism, the tightening mechanism is connected to the power mechanism, the battery box is arranged in the middle part of the support mechanism, the pressing mechanism is connected to the power mechanism, and the battery cover mechanism is detachably connected to the bottom of the pressing mechanism. The lithium battery processing system disclosed in this patent only involves processes such as electrode column installation and material filling. It does not integrate a coating function, and there is no application design for the bottom of the battery box. It needs to rely on subsequent independent processes to complete the side wall application, and does not involve bottom protection at all, making it difficult to meet the sealing requirements of the full package of the battery box.

[0004] Another Chinese patent authorization announcement number CN209658323U discloses a new type of universal tooling for encapsulating rectangular lithium batteries, comprising: a chassis and a reel rotatably mounted on the chassis for unwinding a tape roll, wherein: a first guide platform and a second guide platform are fixedly mounted on the chassis and located on one side of the reel, the first guide platform being located on the side of the second guide platform closer to the reel, and a gap is reserved between the first guide platform and the second guide platform to form an aisle therebetween; the side walls on both sides of the aisle are provided with a plurality of adhesive rollers arranged at intervals along the depth direction thereof, each adhesive roller is parallel to the reel, and the spacing between the adhesive rollers on both sides of the aisle decreases from the top of the aisle to the bottom thereof. Although this patent proposes an adhesive encapsulation tooling, it only partially wraps the sides of the battery box by applying adhesive to the side walls through adhesive rollers. There is a lack of an effective attachment mechanism for the film extension portion at the bottom edge of the battery box, resulting in an exposed area at the junction of the bottom and the side wall, which is prone to short circuit risks due to liquid infiltration or mechanical collision. Summary of the Invention

[0005] In view of the above problems, a battery box assembly device for automotive lithium battery processing is provided. In the present invention, the relative rotation of the conveyor belt is closely coordinated with the descending process of the battery box, enabling the film to quickly and accurately wrap around the side walls of the battery box in a U shape, reducing the pasting time and improving the pasting efficiency. The first pasting component and the second pasting component respectively paste the bottom and side walls of the battery box, and the second pasting component works alternately, avoiding mutual interference and making the pasting process smoother and more efficient. This step-by-step pasting and alternating operation method greatly shortens the overall pasting time and improves the production efficiency.

[0006] To solve the problems of the prior art, the present invention provides a frame and two conveyor belts spaced apart on the frame. There is a gap between the two conveyor belts through which the battery box can pass; the film covers the two conveyor belts, and the width of the film is greater than the width of the battery box, forming extension parts extending beyond both sides of the battery box; below the gap, there is a pressure-bearing frame for supporting the battery box, and the pressure-bearing frame can slide along the height direction of the frame; on the frame, there are also two first pasting components that can slide relative to each other in the horizontal direction. The two first pasting components are used to contact the extension parts of the film at the bottom of the battery box and drive the extension parts to bend towards the battery box to achieve pasting; on both sides of the pressure-bearing frame, there are second pasting components. The two second pasting components can slide relative to each other, and the sliding direction is perpendicular to the sliding direction of the first pasting components. The two second pasting components are used to contact the extension parts of the film on the side walls of the battery box and drive the extension parts to bend towards the battery box to achieve pasting.

[0007] Preferably, a base is provided at the bottom of the frame. Both of the first pasting components include a moving seat. At one end of the moving seat close to the center of the base, there is a first pressing roller. The moving seat can slide along the width direction of the base, and the moving seat is elastically connected to the edge of the base. A distance matching the battery box is left between the moving seats of the two first pasting components.

[0008] Preferably, both of the second pasting components include a connecting seat that can slide along the length direction of the base. On the connecting seat, there are two second pressing rollers extending in the vertical direction. A distance matching the battery box is left between the two second pressing rollers. On the base, there is a first linear driver for driving the connecting seat.

[0009] Preferably, on one end of each of the two conveyor belts close to each other, there is a positioning frame. On the positioning frame, there are a plurality of first guiding rollers arranged along the height direction of the frame.

[0010] Preferably, between the two positioning frames, there are two second guiding rollers. The second guiding rollers are of a telescopic structure. The two ends of the second guiding rollers are respectively sleeved on the first guiding rollers on the two positioning frames. A distance matching the battery box is left between the two second guiding rollers. Preferably, rotatable mounting brackets are provided at the ends of the two conveyor belts close to each other. A third pressure roller is provided at the end of the mounting bracket away from the conveyor belt. Tension springs are provided between both ends of the third pressure roller and the conveyor belts. The third pressure roller is located at the gap between the two conveyor belts before the battery box is applied.

[0011] Preferably, a plurality of through holes arranged in a rectangular array are provided on the conveyor belt, and a negative pressure chamber for adsorbing and positioning the film is provided on the conveyor belt.

[0012] Preferably, a sensor for detecting the moving position of the film is further provided on the conveyor belt.

[0013] Preferably, two guide rods are provided below the pressure-bearing frame. The two guide rods penetrate through the base and are slidably engaged therewith. Elastic members are provided on both guide rods.

[0014] Preferably, a second linear actuator for driving the movement of the pressure-bearing frame is further provided below the base, and a clamping assembly driven by electromagnetic force is provided on the pressure-bearing frame.

[0015] The beneficial effects of the present invention compared with the prior art are as follows: 1. By closely matching the relative rotation of the conveyor belts with the descending process of the battery box, the film can be quickly and accurately wrapped around the side wall of the battery box in a U shape, reducing the application time and improving the application efficiency. The first application assembly and the second application assembly respectively apply the film to the bottom and side walls of the battery box, and the second application assembly works alternately, avoiding mutual interference and making the application process smoother and more efficient. This step-by-step application and alternating operation method greatly shortens the overall application time and improves the production efficiency. The entire application process is highly automated, reducing the manual operation link, lowering the labor intensity of the operator. At the same time, the automated operation also reduces the application quality problems caused by human factors, improves the product qualification rate, and reduces the production cost.

[0016] 2. The present invention constitutes a dynamic limiting channel for the descent of the battery box through the positioning frame and a plurality of first guide rollers. The first guide rollers not only realize the conveying and guiding of the film, but also, through the physical limitation of the battery box, force it to vertically descend from the center of the film, laying a precise positioning foundation for the subsequent U-shaped wrapping and application processes of the film. The second guide roller can adjust the distance by sliding on the first guide roller to ensure contact with the side walls of battery boxes of different specifications. The two first guide rollers and the two second guide rollers can form a four-sided surrounding limit, forcing the geometric center of the battery box to coincide with the center of the film. This improves the smoothness of the battery box descent process and the film application effect.

[0017] 3. Through the arrangement of the mounting frame and the third pressure roller, during the descent of the battery box, the third pressure roller drives the film to adhere to the side wall of the battery box, causing the third pressure roller to roll along the surface of the battery box, evenly pressing the film onto the side wall, and simultaneously offsetting the local stress generated by the speed fluctuation of the conveyor belt or the inclination of the battery box, ensuring that the film is tightly attached to the side wall of the battery box without air bubble residue. Description of the Drawings

[0018] Figure 1 is a schematic three-dimensional structure diagram of a battery box assembly device for automotive lithium battery processing.

[0019] Figure 2 is a front view of a battery box assembly device for automotive lithium battery processing.

[0020] Figure 3 is a schematic three-dimensional structure diagram during the film application process of the battery box of a battery box assembly device for automotive lithium battery processing.

[0021] Figure 4 is a front view during the film application process of the battery box of a battery box assembly device for automotive lithium battery processing.

[0022] Figure 5 is a schematic three-dimensional structure diagram of the base, the first attaching component, and the second attaching component in a battery box assembly device for automotive lithium battery processing.

[0023] Figure 6 is a schematic three-dimensional structure diagram of the base and the first attaching component in a battery box assembly device for automotive lithium battery processing.

[0024] Figure 7 is a schematic three-dimensional structure diagram when the film extension part at the bottom of the battery box in a battery box assembly device for automotive lithium battery processing is turned upwards.

[0025] Figure 8 is a schematic three-dimensional structure diagram when the film extension part on the side wall of the battery box in a battery box assembly device for automotive lithium battery processing is turned towards the center.

[0026] Figure 9 is a schematic three-dimensional structure diagram of the conveyor belt and the positioning clamp in a battery box assembly device for automotive lithium battery processing.

[0027] Figure 10 is Figure 9 the enlarged view of part A in

[0028] The reference numerals in the figure are: 1. Frame; 11. Base; 12. Pressure-bearing frame; 121. Clamping assembly; 122. Second linear driver; 13. Guide rod; 131. Elastic member; 14. First attaching assembly; 141. Moving seat; 142. First pressure roller; 15. Second attaching assembly; 151. Connecting seat; 152. Second pressure roller; 153. First linear driver; 2. Conveyor belt; 21. Positioning frame; 211. First guide roller; 212. Second guide roller; 22. Mounting frame; 221. Third pressure roller; 222. Tension spring; 23. Through hole; 231. Negative pressure chamber; 24. Sensor; 3. Battery box; 31. Film. Detailed implementation manners

[0029] To further understand the features, technical means, specific purposes, and functions achieved by the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0030] As Figures 1 to 4 、 Figure 7 and Figure 8 shown: A battery box assembly device for processing automotive lithium batteries includes a frame 1 and two conveyor belts 2 spaced apart on the frame 1. There is a gap between the two conveyor belts 2 through which the battery box 3 can pass; a film 31 covers the two conveyor belts 2, and the width of the film 31 is greater than the width of the battery box 3, forming extending portions beyond both sides of the battery box 3; a pressure-bearing frame 12 for supporting the battery box 3 is provided below the gap, and the pressure-bearing frame 12 can slide along the height direction of the frame 1; two first attaching assemblies 14 that can slide relative to each other horizontally are further provided on the frame 1. The two first attaching assemblies 14 are used to contact the extending portions of the film 31 at the bottom of the battery box 3 and drive the extending portions to bend towards the battery box 3 to achieve attachment; second attaching assemblies 15 are provided on both sides of the pressure-bearing frame 12. The two second attaching assemblies 15 can slide relative to each other, and the sliding direction is perpendicular to the sliding direction of the first attaching assemblies 14. The two second attaching assemblies 15 are used to contact the extending portions of the film 31 on the side walls of the battery box 3 and drive the extending portions to bend towards the battery box 3 to achieve attachment.

[0031] A film loading device for the film 31 will be provided beside the conveyor belt 2. Through the loading device, the film 31 can be placed on the conveyor belt 2 piece by piece. When the film 31 is placed on the conveyor belt 2, one of the conveyor belts 2 is started to drive the film 31 to move smoothly towards the other conveyor belt 2. During this process, the position of the film 31 will be continuously adjusted until its central position aligns with the midline of the gap between the two conveyor belts 2.

[0032] It should be particularly noted that the length of the film 31 is calculated to match the battery box 3, while the width of the film 31 is greater than the battery box 3, thereby forming extending portions on both sides of the battery box 3 to prepare for the subsequent attachment work.

[0033] At this time, the pressure-bearing frame 12 is located below the gap of the conveyor belt 2 and is in a standby state. The operator gently places the battery box 3 from above the gap onto the pressure-bearing frame 12, and the bottom of the battery box 3 will contact the central position of the film 31. Subsequently, by applying pressure to the battery box 3 or driving the battery box 3 to slide along the height direction of the frame 1 through the downward movement of the pressure-bearing frame 12. Since the bottom of the battery box 3 is in close contact with the center of the film 31, and the gap between the two conveyor belts 2 provides a smooth downward channel for the battery box 3, while the battery box 3 descends, the two conveyor belts 2 start to rotate relatively. This relative rotation enables the film 31 to move towards the gap synchronously with the descent of the battery box 3, thus matching the descent process of the battery box 3 and making the film 31 wrap around the side wall of the battery box 3 in a U shape, completing the preliminary pasting work.

[0034] As the pressure-bearing frame 12 continues to move downward along the height direction of the frame 1, the two first pasting components 14 on the frame 1 start to move relatively. These two first pasting components 14 will contact the extended part of the film 31 at the bottom of the battery box 3. Under the combined action of the pressure-bearing frame 12 and the two first pasting components 14, the part of the extended part of the film 31 located at the bottom of the battery box 3 will be folded upward and closely adhere to the outer wall of the battery box 3, improving the pasting effect of the film 31.

[0035] After completing the pasting of the bottom of the extended part of the film 31, the pressure-bearing frame 12 moves upward, making the height of the battery box 3 higher than that of the first pasting components 14 to avoid interference in subsequent operations. At this time, the two second pasting components 15 located on both sides of the pressure-bearing frame 12 start to move relatively in the horizontal direction. These two second pasting components 15 will contact the parts of the extended part of the film 31 located on the two side walls of the battery box 3, causing the extended part of the film 31 to fold towards the battery box 3. To avoid mutual interference caused by the simultaneous movement of the two second pasting components 15, the two second pasting components 15 will work alternately. With the continuous action of the second pasting components 15, the film 31 will closely adhere to the outer wall of the battery box 3, and finally achieve the effect that all parts of the battery box 3 except the top surface are wrapped by the film 31.

[0036] After completing the pasting work of the film 31, the operator takes out the lithium battery with the film 31 pasted. Subsequently, the pressure-bearing frame 12 resets to the initial position, and the equipment enters the next assembly process of the battery box 3, and so on in a cycle, efficiently completing the assembly work of the battery box 3.

[0037] By closely coordinating the relative rotation of the conveyor belt 2 with the descending process of the battery case 3, the film 31 can be quickly and accurately wrapped around the side wall of the battery case 3 in a U shape, reducing the pasting time and improving the pasting efficiency. The first pasting assembly 14 and the second pasting assembly 15 respectively paste the bottom and the side wall of the battery case 3, and the second pasting assembly 15 works alternately, avoiding mutual interference and making the pasting process smoother and more efficient. This method of step-by-step pasting and alternating operation greatly shortens the overall pasting time and improves the production efficiency.

[0038] The entire pasting process realizes a high degree of automation, reduces the manual operation links, and lowers the labor intensity of the operators. At the same time, the automated operation also reduces the pasting quality problems caused by human factors, improves the yield rate of products, and reduces the production cost.

[0039] As Figures 1 to 8 shown: A base 11 is provided at the bottom of the frame 1. Both of the two first pasting assemblies 14 include a moving seat 141. One end of the moving seat 141 close to the center of the base 11 is provided with a first pressing roller 142. The moving seat 141 can slide along the width direction of the base 11, and the moving seat 141 is elastically connected to the edge of the base 11. A spacing matching the battery case 3 is left between the moving seats 141 of the two first pasting assemblies 14.

[0040] During the operation of the device, the moving seats 141 of the two first pasting assemblies 14 are in a movable state based on the elastic connection relationship with the base 11. And a spacing matching the battery case 3 is preset between the two moving seats 141. When the battery case 3 descends along the height direction of the frame 1 to the bottom of the frame 1 under the bearing action of the pressure-bearing frame 12, the lower edge of the battery case 3 will contact the first pressing rollers 142 on the two moving seats 141. At this time, with the pressure generated by the continuous descent of the battery case 3, it will push the two moving seats 141 to move in opposite directions along the width direction of the base 11 against the resistance of the elastic connection.

[0041] By leaving a spacing between the moving seats 141 that matches the battery case 3, the device can easily adapt to battery cases 3 of different specifications and sizes. As long as the size of the battery case 3 is within a certain range, the pasting operation of the film 31 can be realized through the elastic movement of the moving seats 141. Thereby, the versatility and applicability of the device are improved, and the cost for the enterprise to frequently replace the device due to the production of battery cases 3 of different specifications is reduced.

[0042] Meanwhile, the elastic connection can ensure that the first pressing roller 142 is in close contact with the battery case 3, achieving precise film 31 application, ensuring the stability of the application quality, and uniformly pressing and applying the film 31 as the moving seat 141 moves. This dynamic application method enables the film 31 to better conform to the shape of the battery case 3, effectively avoiding problems such as air bubbles and wrinkles between the film 31 and the battery case 3, improving the flatness and firmness of the film 31 application, thereby enhancing the protection performance and appearance quality of the battery case 3.

[0043] The elastic connection between the moving seat 141 and the base 11 plays a role in buffering and shock absorption. At the moment when the battery case 3 descends and contacts the first pressing roller 142, the elastic connection can absorb and disperse the impact force, reduce the vibration and wear of the equipment, lower the probability of equipment failure, improve the stability and reliability of the equipment, and extend the service life of the equipment.

[0044] As Figures 1 to 8 shown: Both of the two second application components 15 include a connecting seat 151 that can slide along the length direction of the base 11. Two second pressing rollers 152 extending in the vertical direction are provided on the connecting seat 151. A spacing matching the battery case 3 is left between the two second pressing rollers 152. A first linear driver 153 for driving the connecting seat 151 is provided on the base 11.

[0045] After the bottom film 31 of the battery case 3 is applied under the drive of the pressure-bearing frame 12, when the pressure-bearing frame 12 is lifted to a position higher than the first application component 14, the second application component 15 starts to work. The first linear driver 153 on the base 11 starts to output driving force. The first linear driver 153 is preferably a cylinder or an electric push cylinder. This driving force acts on the connecting seat 151, driving the connecting seat 151 to slide along the length direction of the base 11.

[0046] Since two second pressing rollers 152 extending in the vertical direction are provided on the connecting seat 151 and a spacing matching the battery case 3 is left between the two second pressing rollers 152, during the sliding process of the connecting seat 151, the two second pressing rollers 152 will approach the battery case 3 from both sides of the battery case 3 respectively. When the second pressing roller 152 contacts the extension of the film 31 on the side wall of the battery case 3, as the connecting seat 151 continues to slide, the second pressing roller 152 will apply pressure to the extension of the film 31 and drive the extension of the film 31 to fold towards the center of the battery case 3.

[0047] It should be noted that both of the two second pressing rollers 152 are made of elastic materials to ensure that the film 31 can be accurately applied to the side wall of the battery case 3.

[0048] To avoid interference caused by the simultaneous movement of the two second attachment components 15, the first linear drivers 153 of the two second attachment components 15 will control the connecting seats 151 to perform sliding operations alternately. That is, the connecting seat 151 of one second attachment component 15 slides first to complete the attachment of the extension part of the film 31 on one side, and then the connecting seat 151 of the other second attachment component 15 slides to complete the attachment of the extension part of the film 31 on the other side. Finally, the extension part of the side wall film 31 of the battery case 3 is closely attached to the outer wall of the battery case 3, so that all parts except the top surface of the battery case 3 are wrapped by the film 31. After the attachment is completed, the first linear driver 153 drives the connecting seat 151 to reset and waits for the next work instruction.

[0049] As Figures 1 to 4 and Figure 9 shown: Positioning frames 21 are provided at both ends of the two conveyor belts 2 that are close to each other. A plurality of first guide rollers 211 arranged in the height direction of the frame 1 are provided on the positioning frames 21.

[0050] The positioning frame 21 and the plurality of first guide rollers 211 constitute a dynamic limiting channel for the descent of the battery case 3. When the battery case 3 starts to descend from above the gap, the two side walls of the battery case 3 will first come into contact with the first guide rollers 211 on the positioning frame 21. Since the first guide rollers 211 can rotate freely about their own axes, and the plurality of first guide rollers 211 are vertically arranged in the height direction (consistent with the descent direction of the battery case 3), the lateral spacing of the first guide rollers 211 is pre-adjusted according to the width of the battery case 3, forming constraints on both sides of the battery case 3, forcing the battery case 3 to descend vertically along the central axis of the gap between the conveyor belts 2, avoiding lateral deviation caused by manual placement deviation or equipment vibration, and ensuring that the bottom of the battery case 3 is accurately aligned with the central position of the film 31; as the battery case 3 descends, the first guide rollers 211 continuously adhere to the side walls of the battery case 3 through rolling contact, offsetting the tilting moment during the descent process, keeping the battery case 3 in a vertical posture, ensuring uniform force on the central area of the film 31, and avoiding local pulling or wrinkling of the film 31 caused by the skew of the battery case 3. Through the above mechanism, the first guide rollers 211 not only realize the conveying and guiding of the film 31, but also, through the physical limitation of the battery case 3, force it to descend vertically from the center of the film 31, laying a precise positioning foundation for the subsequent U-shaped wrapping and attachment processes of the film 31.

[0051] The surface of the guide roller can be coated with a flexible material, such as silica gel or polyurethane, which reduces the hard friction on the surface of the battery case 3 through elastic contact while limiting, especially suitable for the lithium battery shell with a relatively fragile surface coating layer, avoiding defects such as scratches or indentations caused by traditional rigid limiting devices; the rolling friction replaces the sliding friction, reducing the descent resistance of the battery case 3, and cooperating with the uniform support of the pressure-bearing frame 12, further improving the smoothness of the descent process of the battery case 3.

[0052] As Figures 1 to 4 andFigure 9 As shown in the figure: There are two second guide rollers 212 arranged between two positioning frames 21. The second guide rollers 212 are of a telescopic structure. The two ends of the second guide rollers 212 are respectively sleeved on the first guide rollers 211 on the two positioning frames 21. There is a spacing between the two second guide rollers 212 that matches the battery box 3. The second guide rollers 212 adopt a telescopic structure. The two ends of the second guide rollers 212 are respectively sleeved on the first guide rollers 211 of the two positioning frames 21, and the initial spacing between the two second guide rollers 212 matches the battery box 3. The second guide rollers 212 can adjust the spacing by sliding on the first guide rollers 211 to ensure contact with the side walls of battery boxes 3 of different specifications. The two first guide rollers 211 and the two second guide rollers 212 can form a four-sided surrounding limit to force the geometric center of the battery box 3 to coincide with the center of the film 31.

[0053] When the battery box 3 descends from above the film 31, the side wall of the battery box 3 will contact the roller surface of the second guide roller 212. Since the second guide roller 212 can rotate around its own roller axis, the sliding friction is converted into rolling friction to eliminate the descending resistance, ensuring that the battery box 3 falls smoothly in the vertical direction and avoiding local pulling of the film 31 caused by jamming.

[0054] As Figures 1 to 4 、 Figure 9 and Figure 10 As shown in the figure: At one end where the two conveyor belts 2 are close to each other, there are rotatable mounting frames 22 provided. At one end of the mounting frame 22 away from the conveyor belt 2, there is a third pressure roller 221. There are tension springs 222 arranged between the two ends of the third pressure roller 221 and the conveyor belt 2. The third pressure roller 221 is located at the gap between the two conveyor belts 2 before the battery box 3 is applied.

[0055] After the conveyor belt 2 is started, the film 31 moves from one conveyor belt 2 to the other. The mounting frames 22 at one end where the two conveyor belts 2 are close to each other remain horizontal under the pulling force of the tension springs 222, so that the third pressure roller 221 is located at the center of the gap between the conveyor belts 2, forming an initial support structure for the film 31, avoiding the central relaxation or wrinkles of the film 31 caused by hanging down, and ensuring that the center of the film 31 is aligned with the center line of the gap between the two conveyor belts 2.

[0056] When the battery box 3 is placed in the center of the film 31 from above the gap, its bottom first contacts the film 31, and then pushes the third pressure roller 221 to swing to both sides. Since the mounting frame 22 and the conveyor belt 2 are connected by a rotating pair (such as a pin shaft), and the tension spring 222 provides a reset tension, when the third pressure roller 221 is subjected to the lateral force of the battery box 3, it will drive the mounting frame 22 to rotate around its connection point with the conveyor belt 2. At the same time, it will synchronously drive the film 31 to attach to the side wall of the battery box 3, forming an initial U-shaped wrapping of the film 31 around the battery box 3. At this time, the tension spring 222 is stretched and stores elastic potential energy.

[0057] As the battery case 3 descends with the pressure-bearing frame 12, the conveyor belt 2 rotates relatively to drive the film 31 towards the gap. The third pressure roller 221 always adheres tightly to the side wall of the battery case 3 under the tension of the tension spring 222. The third pressure roller 221 rolls along the surface of the battery case 3, evenly pressing the film 31 against the side wall, and at the same time offsetting the local stress caused by the speed fluctuation of the conveyor belt 2 or the inclination of the battery case 3, ensuring that the film 31 is closely attached to the side wall of the battery case 3 without air bubble residues.

[0058] After the battery case 3 is completed with pasting and lifted, the tension spring 222 releases potential energy, driving the mounting bracket 22 to reset, and the third pressure roller 221 returns to the center of the gap, providing support and positioning for the conveyance of the next film 31.

[0059] As Figures 1 to 4 、 Figure 9 and Figure 10 shown: There are a plurality of through holes 23 arranged in a rectangular array on the conveyor belt 2, and a negative pressure chamber 231 for adsorbing and positioning the film 31 is provided on the conveyor belt 2.

[0060] The negative pressure chamber 231 is connected to an external vacuum pump through a pipeline. When the film 31 is placed on the conveyor belt 2, in order to ensure the stable position of the film 31 when the battery case 3 contacts the film 31, the vacuum pump is started to form a stable negative pressure in the negative pressure chamber 231. The negative pressure chamber 231 generates an adsorption force through the through holes 23, tightly attaching the film 31 to the surface of the conveyor belt 2. The through holes 23 arranged in a rectangular array enable the adsorption force to act evenly on the film 31, avoiding wrinkles or offsets caused by uneven local stress. After the film 31 moves to the target position with the conveyor belt 2, the adsorption force can be adjusted according to the requirements of the pasting process. For example, a strong adsorption is maintained during the conveying stage to fix the film 31, and the adsorption is weakened or turned off during the pasting stage, enabling the film 31 to flexibly follow the descent of the battery case 3 and the action of the pressure roller to achieve folding and wrapping, forming a tight fit with the outer wall of the battery case 3.

[0061] As Figure 9 shown: A sensor 24 for detecting the moving position of the film 31 is also provided on the conveyor belt 2.

[0062] By setting sensors 24 on the conveyor belt 2, the moving position of the film 31 can be monitored in real time. The sensors 24 are installed on both sides of the conveyor belt 2 or at key positions on the moving path of the film 31, continuously emitting detection signals. When the film 31 moves with the conveyor belt 2, the sensors 24 obtain the position information of the edge or positioning mark of the film 31 in real time through the changes in the occlusion or reflection of the detection signals. The sensors 24 transmit the collected position signals to the backend control system. If the position deviation of the film 31 is detected, the control system immediately generates a deviation signal, driving the conveyor belt 2 to adjust the rotation speed or direction, so that the film 31 corrects the position deviation in real time during the movement, ensuring that the center of the film 31 sheet is always aligned with the midline of the gap of the conveyor belt 2, providing an accurate positioning reference for the subsequent pressing and pasting of the battery box 3 on the film 31 sheet.

[0063] The automatic positioning function of the sensors 24 enables the operator to start the equipment only by completing basic operations such as loading the film 31 sheet without having to master complex film 31 centering skills. It solves the pain point of traditional equipment relying on skilled workers and is especially suitable for the rapid deployment and production expansion requirements of large-scale automated production lines.

[0064] As Figures 1 to 6 shown: There are two guide rods 13 provided below the pressure-bearing frame 12. The two guide rods 13 penetrate through the base 11 and are in sliding fit with it. Elastic members 131 are provided on both of the two guide rods 13.

[0065] The two guide rods 13 below the pressure-bearing frame 12 vertically penetrate through the base 11 and are in sliding fit with the base 11, forming a rigid guiding constraint on the pressure-bearing frame 12 to ensure that it moves in a straight line along the height direction of the frame 1. The elastic members 131 absorb the impact energy when the battery box 3 is pressed down, preventing local stress concentration from occurring due to rigid contact between the film 31 and the bottom edge of the battery box 3.

[0066] As Figures 1 to 6 shown: A second linear driver 122 capable of driving the pressure-bearing frame 12 to move is also provided below the base 11, and a clamping assembly 121 driven by electromagnetic force is provided on the pressure-bearing frame 12.

[0067] After the battery box 3 is placed on the pressure-bearing frame 12, the clamping assembly 121 is started by energizing the electromagnetic drive. The clamping assembly 121 preferably consists of two relatively movable jaws, and the battery box 3 is adaptively clamped through electromagnetic force drive. The two jaws are in an open state under the action of an electromagnetic drive mechanism such as an electromagnetic linear motor or an electromagnetic chuck, and the initial distance between the two jaws is greater than the width of the battery box 3. When the battery box 3 is placed on the surface of the pressure-bearing frame 12, the jaws can move to clamp the battery box 3. The clamping force can be adjusted by current to adapt to battery boxes 3 of different sizes and pull the battery box 3 downwards.

[0068] The pressure-bearing frame 12 can be driven to descend by the second linear driver 122. The second linear driver 122 is preferably a cylinder or an electric push rod. Through the second linear driver 122, the lifting and descending of the pressure-bearing frame 12 can be realized, ensuring the operation of the subsequent second attaching component 15 and the reset of the pressure-bearing frame 12.

[0069] The above embodiments only express one or several implementation manners of the present invention, and the description thereof is relatively specific and detailed. However, it should not be construed as a limitation to the protection scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A battery box assembly device for processing automotive lithium batteries, comprising a frame and two conveyor belts spaced apart on the frame, characterized in that, There is a gap between the two conveyor belts through which the battery case can pass; A film covers the two conveyor belts, and the width of the film is greater than the width of the battery case, forming extension parts that extend beyond both sides of the battery case; Below the gap, there is a pressure-bearing frame for supporting the battery case, and the pressure-bearing frame can slide along the height direction of the machine frame; On the machine frame, there are also two first attaching components that can slide relative to each other horizontally. The two first attaching components are used to contact the extension parts of the film at the bottom of the battery case and drive the extension parts to bend towards the battery case to achieve attachment; On both sides of the pressure-bearing frame, there are second attaching components. The two second attaching components can slide relative to each other, and the sliding direction is perpendicular to the sliding direction of the first attaching components. The two second attaching components are used to contact the extension parts of the film on the side walls of the battery case and drive the extension parts to bend towards the battery case to achieve attachment.

2. The battery case assembly device for processing automotive lithium batteries according to claim 1, characterized in that, At the bottom of the machine frame, there is a base. Both of the two first attaching components include moving seats. At one end of the moving seat close to the center of the base, there is a first pressing roller. The moving seat can slide along the width direction of the base, and the moving seat is elastically connected to the edge of the base. There is a spacing matching the battery case between the moving seats of the two first attaching components.

3. An assembly device for a battery box used in the processing of automotive lithium batteries according to claim 2, characterized in that, Both of the two second attaching components include connecting seats that can slide along the length direction of the base. On the connecting seat, there are two second pressing rollers extending vertically. There is a spacing matching the battery case between the two second pressing rollers. On the base, there is a first linear driver for driving the connecting seat.

4. A battery box assembly device for processing automotive lithium batteries according to claim 1, characterized in that, At one end of the two conveyor belts close to each other, there are positioning frames. On the positioning frames, there are multiple first guide rollers arranged along the height direction of the machine frame.

5. The battery case assembly device for processing automotive lithium batteries according to claim 4, characterized in that, Between the two positioning frames, there are two second guide rollers. The second guide rollers are of a telescopic structure. The two ends of the second guide rollers are respectively sleeved on the first guide rollers on the two positioning frames. There is a spacing matching the battery case between the two second guide rollers.

6. The battery box assembly device for processing automotive lithium batteries according to claim 1, wherein, At one end of the two conveyor belts close to each other, there are rotatable mounting frames. At the end of the mounting frame far from the conveyor belt, there is a third pressing roller. There are tension springs between the two ends of the third pressing roller and the conveyor belt. The third pressing roller is located at the gap between the two conveyor belts before the battery case is attached.

7. An assembly device for a battery box used in the processing of automotive lithium batteries according to claim 1, characterized in that, There are multiple through holes arranged in a rectangular array on the conveyor belt, and on the conveyor belt, there is a negative pressure chamber for adsorbing and positioning the film.

8. An assembly device for a battery box used in the processing of automotive lithium batteries according to claim 7, wherein, On the conveyor belt, there is also a sensor for detecting the moving position of the film.

9. The battery box assembly device for processing automotive lithium batteries according to claim 1, wherein, Below the pressure-bearing frame, there are two guide rods. The two guide rods penetrate through the base and are in sliding fit with it. Elastic members are arranged on both of the two guide rods.

10. The battery box assembly device for processing automotive lithium batteries according to claim 9, characterized in that, Below the base, there is also a second linear driver for driving the movement of the pressure-bearing frame. On the pressure-bearing frame, there is a clamping component driven by electromagnetic force.

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