Battery cell pressing device and battery manufacturing equipment

Abstract

The invention relates to the technical field of battery manufacturing equipment, and discloses a battery cell pressing device and battery manufacturing equipment. The battery cell pressing device comprises a pressing table, two opposite sides of which are respectively provided with a connecting assembly; the isolating membrane is arranged on the pressing table, and two end edges of the isolating membrane extend out of the upper surface of the pressing table and extend downwards to be connected with the connecting assemblies respectively; the connecting assemblies on at least one side of the pressing table are elastic assemblies, each elastic assembly comprises a fixing frame, a clamping plate and an elastic structure, the fixing frames are fixedly arranged, the clamping plates are connected with one end edge of the isolating membrane, and the elastic structures are arranged on the fixing frames and connected with the clamping plates. The distance between the fixing edge of the clamping plate for fixing the isolating membrane and the edge, close to the elastic assembly, of the upper surface of the pressing table is B. In the first direction, the length of the portion, flatly laid on the upper surface of the pressing table, of the isolating membrane is A, and A / B is larger than or equal to 3 and smaller than or equal to 7.3. The elastic structure provides safety allowance for installation of the isolating membrane, installation of the isolating membrane is facilitated, and the installation damage rate of the isolating membrane is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of battery manufacturing equipment, and particularly relates to a core pressing device and a battery manufacturing equipment. Background Art

[0002] In the production process of a core, after a positive electrode sheet, a negative electrode sheet, and a separator are wound or laminated into a core, the core can be further pressed through a hot pressing process to make its internal structure more compact, reduce internal voids, and improve the density and energy density of the core.

[0003] The hot pressing process usually uses a hot pressing device to hot press the core. The hot pressing device includes a hot pressing platform, a hot pressing plate, etc. The core is hot pressed through the hot pressing platform and the hot pressing plate. In order to prevent the core from easily sticking to the surface of the hot pressing platform when the core is heated and pressed during the hot pressing process, an anti-sticking film is provided on the hot pressing platform, and the core and the hot pressing platform are separated by the anti-sticking film.

[0004] Currently, the anti-sticking film is laid flat on the hot pressing platform, and both ends of the anti-sticking film extend out of the hot pressing platform and are fixed on both sides of the hot pressing platform. In order to ensure the flatness of the core pressing, the anti-sticking film needs to be in a taut state. When installing the anti-sticking film, one end of the anti-sticking film is first fixed on one side of the hot pressing platform, and then the anti-sticking film is tightened and fixed on the other side of the hot pressing platform. During the process of tightening the anti-sticking film, the first installed end is easily damaged by the pulling force, which is not convenient for the installation of the anti-sticking film, and the installation damage rate of the anti-sticking film is relatively high. Summary of the Invention

[0005] In view of this, the present invention provides a core pressing device and a battery manufacturing equipment to solve the problem that when both ends of the anti-sticking film are fixed on both sides of the hot pressing platform, the first installed end is easily damaged by the pulling force, resulting in difficult installation of the anti-sticking film.

[0006] In a first aspect, the present invention provides a core pressing device, including: a pressing table for receiving the core, and connecting components are respectively arranged on opposite sides of the pressing table; an isolation film is arranged on the pressing table, and both end edges of the isolation film along a first direction extend out of the upper surface of the pressing table and extend downward to be respectively connected with the connecting components; wherein, the connecting components on at least one side of the pressing table are all elastic components, and the elastic component includes a fixing frame, a clamping plate, and an elastic structure. The fixing frame is fixedly arranged, the clamping plate is connected with one end edge of the isolation film, and the elastic structure is arranged on the fixing frame and connected with the clamping plate. The elastic component is used to provide installation allowance for the installation of the isolation film and provide elastic force for tensioning. The distance between the fixed edge of the clamping plate for fixing the isolation film and the edge of the pressing table close to the elastic component on the upper surface of the pressing table is B, and along the first direction, the length of the isolation film laid flat on the upper surface of the pressing table is A, and 3 ≤ A / B ≤ 7.3.

[0007] In a second aspect, the present invention further provides a battery manufacturing equipment, including: the above-mentioned core pressing device.

[0008] Beneficial effects: During the hot pressing process, it is necessary to ensure the flatness of the separator film. The separator film should be in a taut state on the pressing table. In this state, it is necessary to consider how to quickly install and replace the separator film. When installing the separator film, first connect one end edge of the separator film to the elastic component, then tighten the other end edge of the separator film, so that the clamping plate and the elastic structure move, and then fix the other end edge of the separator film, thus completing the installation and fixation of the separator film. The elastic structure provides a safety margin for the installation of the separator film, facilitates the installation of the separator film, reduces the installation damage rate of the separator film, and effectively solves the problem that when both ends of the anti-adhesive film are fixed on both sides of the hot pressing platform, the first installed end is easily damaged by force pulling, resulting in difficult installation of the anti-adhesive film.

[0009] The ratio of A to B is within the range of 3 - 7.3. On the one hand, it ensures that the separator film 3 on the upper surface of the pressing table 1 is in a taut state, thereby improving the flatness of the surface of the battery cell after hot pressing and also providing protection and isolation for the battery cell; on the other hand, it can ensure that there is a certain installation margin for the separator film 3 and reduce the risk of damage to the separator film 3 caused by force pulling. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0011] Figure 1 It is a three-dimensional view of a battery cell pressing device according to an embodiment of the present invention; Figure 2 is Figure 1 a partial enlarged schematic view of E in Figure 3 is Figure 1 a side view of a part of the battery cell pressing device shown in Figure 4 is Figure 1 a simplified front view of the battery cell pressing device shown in Figure 5 It is a simplified front view of another battery cell pressing device according to an embodiment of the present invention; Figure 6 is Figure 5 a partial enlarged schematic view of F in Figure 7 It is a simplified front view of yet another battery cell pressing device according to an embodiment of the present invention; Figure 8 is Figure 7 a partial enlarged schematic view of G in

[0012] Description of the reference numerals: 1. Pressing table; 101. First pressing table; 102. Second pressing table; 2. Pressing plate; 3. Isolation film; 4. Fixing frame; 401. Installation vertical plate; 402. Fixing plate; 5. Clamping plate; 501. Bottom plate; 502. Clamping plate; 6. Guide post; 7. Elastic member; 8. Fastener; 9. Moving plate; 10. Baffle; 11. Hot pressing driving member; 12. Upper support plate; 13. Guide mechanism; 14. Support platform; 15. Frame; 1501. Support plate; 1502. Support leg; 16. Support column; 17. Lifting driving member; 18. Synchronization plate. Detailed implementation manners

[0013] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0014] The following combines Figures 1 to 8 to describe the embodiments of the present invention.

[0015] According to an embodiment of the present invention, on the one hand, a cell pressing device is provided, including: a pressing table 1 and an isolation film 3. The pressing table 1 is used to receive the cell, and connection components are respectively arranged on two opposite sides of the pressing table 1; the isolation film 3 is arranged on the pressing table 1, and both end edges of the isolation film 3 along the first direction extend out of the upper surface of the pressing table 1 and extend downward to be respectively connected with the connection components; the connection components on at least one side of the pressing table 1 are all elastic components, and the elastic component includes a fixing frame 4, a clamping plate 5 and an elastic structure. The fixing frame 4 is fixedly arranged, the clamping plate 5 is connected with one end edge of the isolation film 3, and the elastic structure is arranged on the fixing frame 4 and connected with the clamping plate 5. The elastic component is used to provide installation allowance for the installation of the isolation film 3 and provide elastic force for tensioning. The distance between the fixed edge of the isolation film 3 fixed by the clamping plate 5 and the edge of the upper surface of the pressing table 1 close to the elastic component is B, and along the first direction, the length of the isolation film 3 laid flat on the upper surface of the pressing table 1 is A, and 3 ≤ A / B ≤ 7.3.

[0016] When applying the cell pressing device of this embodiment, it is necessary to ensure the flatness of the isolation film 3 during the hot pressing process. The isolation film 3 should be in a taut state on the pressing table 1. In this state, it is necessary to consider how to quickly install and replace the isolation film 3. When installing the isolation film 3, first connect one end edge of the isolation film 3 with the elastic component, then tighten the other end edge of the isolation film 3, so that the clamping plate 5 and the elastic structure move, and then fix the other end edge of the isolation film 3, thus completing the installation and fixation of the isolation film 3. The elastic structure provides a safety margin for the installation of the isolation film 3, facilitates the installation of the isolation film 3, reduces the installation damage rate of the isolation film 3, and effectively solves the problem that when both ends of the anti-adhesive film are fixed on both sides of the hot pressing platform, the first installed end is easily damaged by force pulling, resulting in difficult installation of the anti-adhesive film.

[0017] The length A of the isolation film 3 laid flat on the upper surface of the pressing table 1 should neither be too long nor too short. If A is too long, the plane of the isolation film 3 will not be tight enough, affecting the flatness of cell pressing; if A is too short, the cell cannot be protected and isolated. At the same time, the distance B between the fixed edge of the isolation film 3 fixed by the clamping plate 5 and the edge of the upper surface of the pressing table 1 close to the elastic component should neither be too long nor too short. If B is too short, there is no installation allowance, and the first installed end is easily damaged by force pulling. If B is too long, the allowance is large, which may cause the isolation film 3 on the upper surface of the pressing table 1 not to be in a taut state on the pressing table 1, affecting cell pressing.

[0018] Therefore, the ratio of A to B is within the range of 3 - 7.3. On the one hand, it ensures that the isolation film 3 on the upper surface of the pressing table 1 is in a taut state, thereby improving the flatness of the cell surface after hot pressing and also protecting and isolating the cell; on the other hand, it can ensure that the isolation film 3 has a certain installation allowance and reduce the risk of the isolation film 3 being damaged by force pulling.

[0019] It should be noted that the downward extension of the end edge of the separator film 3 means that the end edge of the separator film 3 extends along a direction inclined relative to the third direction towards a position lower than the upper surface of the platen 1. The clamping plate 5 has a clamping surface for clamping the separator film, and the fixed edge refers to the edge of the clamping surface close to the platen 1.

[0020] Furthermore, the clamping plate 5 is detachably connected to the separator film 3. When the separator film 3 needs to be replaced, the clamping plate 5 and the separator film 3 are directly disassembled, and then the new separator film 3 is connected to the clamping plate 5, realizing the rapid replacement of the separator film 3, improving the replacement efficiency, without using adhesive or coating to fix the anti-adhesive film, effectively solving the problem that the adhesive or coating is not easy to fall off, resulting in low replacement efficiency of the anti-adhesive film.

[0021] It should be noted that the length A of the separator film 3 laid flat on the upper surface of the platen 1 is also Figure 4 the lateral dimension of the separator film 3 located on the upper surface of the platen 1 in

[0022] Furthermore, A is 150 mm - 220 mm, and B is 30 mm - 50 mm.

[0023] Preferably, A is 150 mm, 167 mm, 175 mm, 184 mm, 190 mm, 196 mm, 210 mm, 220 mm or within the range composed of any two of the above values, and B is 30 mm, 35 mm, 36 mm, 37 mm, 44 mm, 46 mm, 50 mm or within the range composed of any two of the above values.

[0024] In one embodiment, as Figure 3 shown, the connection components on both sides of the platen 1 are elastic components. A is 185 mm - 195 mm, B is 30 mm - 40 mm, and A / B is 4.75 - 6.5. During the installation process of the separator film 3, no matter which end is installed first, the other end can have installation allowance through the deformation of the elastic component. Therefore, A is 185 mm - 195 mm, B is 30 mm - 40 mm, and A / B is 4.75 - 6.5, which is convenient for installing the connection component and reduces the installation difficulty. Preferably, A is 190 mm, B is 35 mm, and A / B is 5.43.

[0025] It is understandable that in another embodiment, the connection components on one side of the press table 1 are all elastic components, and the connection components on the other side of the press table 1 are all fixed components, A is 205mm-215mm, B is 40mm-50mm, and A / B is 4.1-5.375. After the isolation membrane 3 is installed and tightened, only one end will have elastic deformation, and the tension state of the isolation membrane 3 on the press table 1 is better. Therefore, A is 205mm-215mm, B is 40mm-50mm, and A / B is 4.1-5.375, ensuring that the isolation membrane 3 is in a tight state, thereby improving the flatness of the battery cell. Preferably, A is 210mm, B is 40mm, and A / B is 5.25.

[0026] In one embodiment, along a second direction perpendicular to both the first direction and the height direction of the press platform 1, the width C of the isolation film 3 does not exceed the width of the press platform 1. Figure 3 The lateral dimension of the isolation film 3 in the press plate 1. If the width of the isolation film 3 exceeds the width of the press plate 1, the portion of the film beyond the press plate 1 may be drawn into the device, causing a malfunction or accident. Therefore, the width C of the isolation film 3 does not exceed the width of the press plate 1, which is beneficial to enhancing the safety of the device.

[0027] Furthermore, when C is large, it is easy to cause wrinkles in the isolation membrane 3, which in turn affects the pressing of the battery cells and increases the number of connecting components on both sides, which is costly; when C is small, the battery cells cannot be completely covered, which may cause the battery cells to directly contact the pressing platform 1 locally, causing adhesion or damage to the surface of the battery cells.

[0028] Therefore, C is 400mm-500mm, 1200≤(A / B)×C≤3650, which not only ensures the flatness of the isolation film 3, but also completely covers the isolation film 3, effectively preventing the battery cell from directly contacting the press table 1 locally to cause adhesion or damage the battery cell surface.

[0029] Preferably, C is 400 mm, 410 mm, 420 mm, 430 mm, 440 mm, 450 mm, 460 mm, 470 mm, 480 mm, 490 mm, 500 mm or within a range formed by any two of the above values.

[0030] In one embodiment, Figure 1 As shown, in each connection assembly, the number of elastic structures is more than two, and the more than two elastic structures are arranged at intervals along the second direction. By applying a force to one end edge of the isolation membrane 3 by more than two elastic structures, the isolation membrane 3 can be better tensioned, so that the surface of the isolation membrane 3 is smoother and wrinkle-free.

[0031] Preferably, in each connecting assembly, the number of the elastic structures is two or three.

[0032] It can be understood that in another embodiment, in each connecting component, the number of elastic structures is one, and one elastic structure is arranged corresponding to the middle part of the pressing table 1.

[0033] In one embodiment, as Figure 1 shown, in each connecting component, the number of fixing frames 4 is the same as the number of elastic structures and they are arranged in one-to-one correspondence. The size of the fixing frame 4 is small, saving the material consumption and having a lower cost.

[0034] It can be understood that in another embodiment, in each connecting component, the number of fixing frames 4 is one, and all the elastic structures are arranged on one fixing frame 4. Arranging all the elastic structures on one fixing frame 4, the number of fixing frames 4 is small, which is convenient for assembly and improves the assembly efficiency.

[0035] In one embodiment, as Figure 4 shown, connecting components are respectively arranged on the opposite two sides of the pressing table 1, and the two connecting components are connected in one-to-one correspondence with the two end edges of the isolation film 3. When installing the isolation film 3, no matter which end edge of the isolation film 3 is installed first, the other end edge can generate an installation allowance through the deformation of the elastic component, making it easier to install.

[0036] It can be understood that in another embodiment, a fixing component is arranged on one side of the pressing table 1, and an elastic component is arranged on the other side of the pressing table 1. After the isolation film 3 is installed and tightened, only one end edge has elastic deformation, the tension state of the isolation film 3 is better, and the surface of the isolation film 3 is flatter and has no wrinkles.

[0037] In one embodiment, as Figure 1 shown, the battery cell pressing device further includes a support platform 14, the pressing table 1 is arranged on the support platform 14, and the fixing frame 4 is arranged on the support platform 14. By using the support platform 14 to support the pressing table 1 and the fixing frame 4, a stable foundation can be provided for the pressing table 1 and the fixing frame 4 to ensure the stability during the hot pressing process.

[0038] In one embodiment, as Figure 1 and Figure 4 shown, the elastic structures are arranged along the height direction of the pressing table 1. In other words, the elastic structures are arranged vertically. When tightening the isolation film 3, the gravity of the clamping plate 5 and the elastic structures and the elastic force of the elastic structures act on the isolation film 3 together. The acting direction of the elastic structures coincides with the direction of gravity, which enables the force to be directly and effectively transmitted to the isolation film 3, can provide a more stable tightening effect, and the overall stress condition of the elastic structures is better, reducing the risk of the elastic structures shifting or tilting.

[0039] It can be understood that in another embodiment, as Figure 5 and Figure 6As shown, the elastic structure is arranged in the first direction. In other words, the elastic structure is horizontally arranged. Compared with the vertical arrangement of the elastic structure, it may cause greater friction and instability, which is likely to cause additional wear. Moreover, since the acting direction of the elastic structure is perpendicular to the direction of gravity, the elastic structure needs to overcome more horizontal displacement to provide effective support and buffering. The elastic structure may not be able to effectively share the load, resulting in uneven stress on the overall structure.

[0040] In one embodiment, as Figure 2 and Figure 4 shown, the elastic structure includes an elastic member 7 and a guide post 6. The first end of the guide post 6 passes through the fixing bracket 4 and is connected to the clamping plate 5. The elastic member 7 is sleeved on the guide post 6. One end of the elastic member 7 abuts against the side of the fixing bracket 4 away from the clamping plate 5, and the other end of the elastic member 7 abuts against the end of the guide post 6 away from the clamping plate 5. By the movement of the guide post 6 relative to the fixing bracket 4, the movement of the isolation film 3 can be guided to ensure that the movement of the isolation film 3 is more stable. Using the guide post 6 to support the elastic member 7 can avoid the risk of failure of the elastic member 7 due to a large deformation distance of the elastic member 7, thereby extending the service life of the elastic member 7.

[0041] Furthermore, after the isolation film 3 and the clamping plate 5 are disassembled and installed for a long time, they are prone to looseness. If the elastic member 7 directly acts on the clamping plate 5, the risk of loosening at the fixed position of the clamping plate 5 and the isolation film 3 will be aggravated. Therefore, the fixing bracket 4 is arranged between the elastic member 7 and the clamping plate 5. One end of the elastic member 7 acts on the fixing bracket 4 and the other end acts on the guide post 6. The elastic member 7 does not directly act on the clamping plate 5, reducing the force at the position where the isolation film 3 is fixed on the clamping plate 5. Furthermore, the structure of the clamping plate 5 is strengthened by the fixing bracket 4 and the elastic member 7 is slowly released, thereby reducing the risk of loosening at the fixed position of the clamping plate 5 and the isolation film 3, effectively solving the problem that the fixed position of the support plate and the anti-adhesive film is prone to looseness when the elastic member 7 is arranged between the support plate and the fixing bracket 4, resulting in the anti-adhesive layer not being able to be tensioned and tightened, ensuring that the surface of the battery cell on the hot press table 1 is flat and free of wrinkles, and improving the production quality and efficiency.

[0042] In one embodiment, as Figure 4 shown, the guide post 6 is arranged in the vertical direction. The upper end of the guide post 6 passes through the fixing bracket 4 and is connected to the clamping plate 5. The elastic member 7 is arranged below the fixing bracket 4. The guide post 6 has an installation portion located below the fixing bracket 4. The elastic member 7 is sleeved on the installation portion. At this time, the elastic structure is vertically arranged. When the isolation film 3 is tightened, the gravity of the clamping plate 5, the elastic structure and the elastic force of the elastic structure act on the isolation film 3 together. The acting direction of the elastic structure coincides with the direction of gravity, which enables the force to be directly and effectively transmitted to the isolation film 3, providing a more stable tightening effect, and the overall stress condition of the elastic structure is better, reducing the risk of the elastic structure shifting or tilting.

[0043] Further, the fixing bracket 4 is a horizontal plate perpendicular to the third direction.

[0044] It can be understood that in another embodiment, as Figure 7 and Figure 8 shown, the guide post 6 is arranged along the first direction. One end of the guide post 6 close to the pressing table 1 passes through the fixing bracket 4 and is connected to the clamping plate 5. The elastic member 7 is arranged on the side of the fixing bracket 4 away from the pressing table 1. The guide post 6 has a mounting portion located on the side of the fixing bracket 4 away from the pressing table 1. The elastic member 7 is sleeved on the mounting portion. At this time, the elastic structure is horizontally arranged. Compared with the vertically arranged elastic structure, it may cause greater friction and instability, and thus is prone to cause additional wear. And because the acting direction of the elastic structure is perpendicular to the direction of gravity, the elastic structure needs to overcome more horizontal displacement to provide effective support and buffering. The elastic structure may not be able to effectively share the load, resulting in uneven force on the overall structure.

[0045] Further, the fixing bracket 4 includes a mounting vertical plate 401 and a fixing plate 402. The mounting vertical plate 401 has a through hole for the guide post 6 to pass through. The fixing plate 402 is arranged on the lower side of the mounting vertical plate 401. It is fixed on the support platform 14 through the fixing plate 402, which is convenient to fix the fixing bracket 4 on the support platform 14.

[0046] Preferably, the mounting vertical plate 401 and the fixing plate 402 are perpendicularly arranged, that is, the fixing bracket 4 is in an L shape.

[0047] In one embodiment, a baffle 10 is arranged at the second end of the guide post 6. The elastic member 7 is located between the fixing bracket 4 and the baffle 10. One end of the elastic member 7 abuts against the fixing bracket 4 and the other end abuts against the baffle 10. The other end of the elastic member 7 is restricted by the baffle 10. When the isolation film 3 is tensioned, the elastic force of the elastic member 7 is applied to the baffle 10, and then drives the guide post 6 and the clamping plate 5 to move downward. The movement of the clamping plate 5 pulls the isolation film 3, thereby realizing the tensioning of the isolation film 3.

[0048] Specifically, when installing the isolation film 3, first connect one side edge of the isolation film 3 to the clamping plate 5 on one side of the pressing table 1, then tighten the other side edge of the isolation film 3, drive one side edge of the isolation film 3, the clamping plate 5, the guide post 6 and the baffle 10 to move upward. The baffle 10 compresses the elastic member 7, and then fix the other side edge of the isolation film 3. After the isolation film 3 is fixed, the elastic member 7 applies an elastic force to the isolation film 3, so that the isolation film 3 is in a taut state.

[0049] Further, arranging the fixing bracket 4 between the elastic member 7 and the clamping plate 5 can better realize the tensioning of the isolation film 3 on the surface of the pressing table 1, and avoid the isolation film 3 being uneven or wrinkled, which may affect the subsequent cell pressing and cell structure damage.

[0050] Specifically, the elastic member 7 is a spring, which is convenient to use and has a low cost. It can be understood that the elastic member 7 can also be an elastic cylinder or the like.

[0051] In one embodiment, the isolation film 3 is fixed by the clamping plate 5, which can ensure that the isolation film 3 is firmly fixed during the hot pressing process and ensure that the isolation film 3 is subjected to a uniform fixing force in all directions, avoiding wrinkles or relaxation caused by uneven local stress.

[0052] Furthermore, by the detachable connection between the clamping plate 5 and the isolation film 3, when the isolation film 3 needs to be maintained or replaced, the clamping member and the isolation film 3 can be disassembled, and the isolation film 3 can be maintained or replaced in time, realizing the timely maintenance and replacement of the isolation film 3 subsequently, and thus reducing the occurrence of sudden failures.

[0053] Specifically, the pressing table 1 has an upper surface perpendicular to the third direction and a side surface perpendicular to the first direction, and the upper surface and the side surface are transitioned by an arc surface. The isolation film 3 has an upper film segment in contact with the upper surface of the pressing table 1 and a side film segment located outside the side surface of the pressing table 1. If the upper surface and the side surface are directly transitioned at a right angle, the edge between the upper surface and the side surface is likely to scratch or cut the isolation film 3. The setting of the arc surface enables the upper film segment and the side film segment to be transitioned by an arc film segment, which can avoid the situation that the isolation film 3 is scratched or cut and prolong the service life of the isolation film 3.

[0054] It can be understood that in another embodiment, as Figure 6 shown, the fixing frame 4 includes a guide post 6 and a baffle 10, the elastic component includes a moving plate 9 and an elastic member 7, one end of the guide post 6 is fixed to one side of the pressing table 1, the other end of the guide post 6 is a free end, the baffle 10 is arranged on the guide post 6, the moving plate 9 is movably placed at the free end and is connected to the clamping plate 5, and the elastic member 7 is sleeved on the guide post 6 between the baffle 10 and the moving plate 9. Further, a limiting plate is provided at the free end of the guide post 6, and the limiting plate can prevent the moving plate 9 from detaching from the guide post 6.

[0055] In one embodiment, as Figure 2As shown in the figure, the clamping plate 5 includes a bottom plate 501 and a clamping plate 502. The end edge of the isolation film 3 is clamped between the bottom plate 501 and the clamping plate 502, and the bottom plate 501 and the clamping plate 502 are detachably connected by a fastener 8. The end edge of the isolation film 3 can be clamped by the bottom plate 501 and the clamping plate 502, improving the fixing reliability between the isolation film 3 and the clamping plate 5, and effectively avoiding the loosening of the isolation film 3 and the clamping plate 5. When the isolation film 3 needs to be replaced, only the fastener 8 needs to be removed, then the clamping plate 502 and the bottom plate 501 are separated, then the end edge of the new isolation film 3 is placed on the bottom plate 501, then the clamping plate 502 is placed on the isolation film 3, and finally the fastener 8 is tightened. The connection between the bottom plate 501 and the clamping plate 502 by the fastener 8 facilitates the rapid installation of the isolation film 3 and improves the replacement efficiency.

[0056] Further, the lower surface of the clamping plate 502 is a clamping surface, and a fixed edge is formed at the edge of the lower surface close to the pressing table.

[0057] In one embodiment, a plurality of convex portions are provided on the surface of the clamping plate 502 facing the bottom plate 501 at intervals, and the convex portions are used to press the isolation film 3. The tension of the isolation film 3 disposed between the elastic members 7 can be ensured to be uniform through the convex portions, ensuring that the isolation film 3 is flat and free of wrinkles.

[0058] Further, a concave portion is formed between adjacent convex portions, and at this time, the convex portions and the concave portions alternately form a concavo-convex structure.

[0059] In one embodiment, the number of the fasteners 8 is multiple, and the multiple fasteners 8 are arranged along the extending direction of the end edge. The ratio of the product of the diameter d of the fastener 8 and the distance L1 between any two adjacent fasteners 8 to the width C of the isolation film 3 along the extending direction of the end edge is 0.3 - 1.375. By fastening the isolation film 3 with a plurality of fasteners 8, the isolation film 3 is more firmly fixed on the clamping plate 5, avoiding the loosening of the isolation film 3 and the clamping plate 5.

[0060] Further, the ratio of (d×L1) to C should neither be too small nor too large. If the ratio of (d×L1) to C is too small, the isolation film 3 needs a large deformation of the elastic member 7 to be tensioned, and at this time, there is a risk of structural failure due to stress concentration of the fastener 8; if the ratio of (d×L1) to C is too large, the isolation film 3 is quickly tensioned, and there is a risk of loosening due to the too large size or too far distance of the fastener 8.

[0061] Therefore, the ratio of (d×L1) to C is in the range of 0.3 - 1.375. On the one hand, the risk of fastener 8 failure can be avoided, and on the other hand, the loosening risk between the isolation film 3 and the clamping member can be reduced.

[0062] Specifically, the range of d is 3mm - 5mm, the range of L1 is 50mm - 110mm, and the range of C is 400mm - 500mm.

[0063] Preferably, d is 3 mm, 3.2 mm, 3.4 mm, 3.6 mm, 3.8 mm, 4 mm, 4.2 mm, 4.4 mm, 4.6 mm, 4.8 mm, 5 mm or within the range formed by any two of the above values, L1 is 50 mm, 60 mm, 70 mm, 80 mm, 90 mm, 100 mm, 110 mm or within the range formed by any two of the above values, and C is 400 mm, 410 mm, 420 mm, 430 mm, 440 mm, 450 mm, 460 mm, 470 mm, 480 mm, 490 mm, 500 mm or within the range formed by any two of the above values.

[0064] It should be noted that the units of A, B, C, d, and L1 are all mm. The first direction, the second direction, and the third direction can refer to Figure 1 as shown, the vertical direction and the height direction of the platen 1 are Figure 1 the third direction in []. The first direction, the second direction, and the third direction are perpendicular to each other pairwise. The values of A, B, and C are measured after the isolation film 3 is installed in a taut state and the average value is taken after measuring three times.

[0065] In one embodiment, as Figure 1 , Figure 4 and Figure 5 shown, the platen 1 includes a first platen 101 and a second platen 102 arranged along the first direction; the first platen 101 is arranged to be liftable along the third direction. The battery cell pressing device further includes a lifting driving member 17, and the lifting driving member 17 is connected to the first platen 101. The lifting driving member drives the first platen 101 to move along the third direction so that the first platen 101 protrudes from the surface of the second platen 102 or retracts to be flush with the surface of the second platen 102.

[0066] When placing the battery cell, the lifting driving member 17 drives the first platen 101 to rise, thereby lifting the first platen 101. The middle part of the isolation film 3 is also lifted. The movement of the isolation film 3 drives the clamping plate 5, the guide post 6, and the baffle 10 to move upward together. The baffle 10 compresses the elastic member 7. When the first platen 101 rises to a certain distance, the manipulator for clamping the battery cell places the battery cell on the isolation film 3 on the first platen 101. Then the lifting driving member 17 drives the first platen 101 to descend to be flush with the second platen 102. During the descent of the first platen 101, the elastic member 7 applies an elastic force to the baffle 10, thereby tensioning the isolation film 3.

[0067] When the gripper of the manipulator transfers the battery cell to the first pressing table 101, the middle part of the battery cell is lifted by the first pressing table 101. At this time, the gripper is suspended, and the gripper can be withdrawn by loosening it. After the gripper is withdrawn, the battery cell is carried on the first pressing table 101. Then, the first pressing table 101 descends until it is flush with the surface of the second pressing table 102. It can be seen that during the placement process of the battery cell, the gripper never contacts the second pressing table 102, so it can prevent the battery cell from shaking or toppling when the gripper is withdrawn.

[0068] In one embodiment, the number of the second pressing tables 102 is two. The two second pressing tables 102 are arranged on opposite sides of the first pressing table 101. The length of each second pressing table 102 in the first direction is L. The arrangement of the two second pressing tables 102 increases the width of the pressing table 1 in the first direction, enabling hot pressing of battery cells with larger sizes, and having a wide range of applications. Moreover, after the first pressing table 101 rises, both ends of the battery cell protrude from the first pressing table 101 in the first direction after being placed on the first pressing table 101, that is, both ends of the battery cell are suspended, making the battery cell more stably supported on the first pressing table 101, effectively avoiding the situation where the battery cell is prone to shaking during the lifting and lowering process due to only one end being suspended.

[0069] Furthermore, both the first pressing table 101 and the second pressing table 102 are arranged on the support platform 14. The first pressing table 101 and the second pressing table 102 are supported by the support platform 14. When the first pressing table 101 is flush with the second pressing table 102, the stability of the first pressing table 101 can be ensured without movement, thereby improving the stability during hot pressing.

[0070] In one embodiment, a first heating element is provided on the second pressing table 102. The first heating element is used to heat the second pressing table 102. The first heating element is directly integrated into the second pressing table 102, which can make the heat more evenly distributed on the entire plate surface, thereby ensuring that the battery cell is evenly heated during the hot pressing process.

[0071] Furthermore, a second heating element is provided on the first pressing table 101. The second heating element is used to heat the first pressing table 101. The second heating element is directly integrated into the first pressing table 101, which can make the heat more evenly distributed on the entire plate surface, thereby ensuring that the battery cell is evenly heated during the hot pressing process. The settings of the first heating element and the second heating element can quickly and accurately reach the required heating temperature, can significantly shorten the hot pressing cycle, and improve the overall efficiency of the production line.

[0072] It can be understood that in another embodiment, the second heating element may not be provided on the first pressing table 101. The gap between the first pressing table 101 and the second pressing table 102 is 0.1 mm - 0.5 mm, and the second pressing table 102 heats the first pressing table 101 by heat conduction. After the second pressing table 102 is heated, its heat is transferred to the first pressing table 101. The gap between the first pressing table 101 and the second pressing table 102 can also ensure the heat conduction effect and avoid friction between the first pressing table 101 and the second pressing table 102 when the first pressing table 101 moves up and down, thus prolonging the service life of the pressing table 1.

[0073] In one embodiment, along the second direction perpendicular to the first direction and the height direction of the pressing table 1, the length of the first pressing table 101 is greater than the length of the second pressing table 102, which is convenient for connecting the first pressing table 101 with the lifting driving member 17.

[0074] It can be understood that in another embodiment, the length of the first pressing table 101 is equal to the length of the second pressing table 102.

[0075] In one embodiment, both ends of the first pressing table 101 along its length direction have protruding parts protruding from the second pressing table 102, and each protruding part is connected to the driving end of the lifting driving member 17. The driving ends of the lifting driving member 17 are connected to the two protruding parts, ensuring that the pressing table 1 does not tilt or shake during the lifting process, and enabling the first pressing table 101 to move up and down smoothly.

[0076] In one embodiment, the battery cell pressing device further includes a frame 15, and the first pressing table 101, the second pressing table 102, and the lifting driving member 17 are arranged on the frame 15. The frame 15 provides a solid support foundation to ensure the stability of the first pressing table 101 and the second pressing table 102 during operation.

[0077] In one embodiment, the frame 15 includes a support plate 1501. The support plate 1501 is provided with a guide hole. The lifting driving member 17 is arranged below the support plate 1501. A guide shaft is fixed to the bottom of the protruding part, and the lower end of the guide shaft passes through the guide hole and is connected to the driving end of the lifting driving member 17. The precise fit between the guide hole and the guide shaft can ensure the accurate movement of the first pressing table 101 in the vertical direction, effectively reducing or eliminating lateral displacement, and ensuring that the pressing table 1 can accurately reach the predetermined position each time.

[0078] Further, the number of the lifting driving members 17 is one. The battery cell pressing device further includes a synchronizing plate 18. All the guide shafts are connected to the synchronizing plate 18, and the driving end of the lifting driving member 17 is connected to the synchronizing plate 18, reducing the number of driving members and saving costs.

[0079] It can be understood that in another embodiment, the number of lifting driving members 17 is two, and the two lifting driving members 17 are fixed on the bottom surface of the support plate 1501 and are respectively connected to the two protruding parts in one-to-one correspondence.

[0080] It can be understood that in another embodiment, the frame 15 includes a support plate 1501, the lifting driving member 17 is arranged on the top surface of the support plate 1501, the driving end of the lifting driving member 17 is directly connected to the protruding part, and at this time, the number of the lifting driving members 17 is two, and the two lifting driving members 17 are respectively connected to the two protruding parts in one-to-one correspondence.

[0081] In one embodiment, the battery cell pressing device further includes a pressing plate 2 and a frame 15. The pressing plate 2 is arranged above the pressing table 1. The isolation film 3 is used to isolate the pressing table 1 and the battery cell when the pressing plate 2 and the pressing table 1 hot-press the battery cell. The frame 15 is used to support components such as the pressing table 1 and the pressing plate 2. An upper support plate 12 is fixed above the frame 15. The pressing plate 2 is arranged on the upper support plate 12 in a liftable manner. A hot-pressing driving member 11 for driving the pressing plate 2 to lift is arranged on the upper support plate 12. The hot-pressing driving member 11 drives the pressing plate 2 to descend, thereby hot-pressing the battery cell.

[0082] Further, the frame 15 includes a support plate 1501 and a plurality of legs 1502. The support platform 14 is fixed on the support plate 1501. The plurality of legs 1502 are arranged on the bottom surface of the support plate 1501, and the legs 1502 are used to support the support plate 1501. A support column 16 is arranged between the upper support plate 12 and the support plate 1501 to support the upper support plate 12 and the components thereon.

[0083] Further, a guiding mechanism 13 is arranged between the upper support plate 12 and the pressing plate 2. The guiding mechanism 13 can move the lifting of the pressing plate 2, making the moving process of the pressing plate 2 more stable and improving the hot-pressing effect.

[0084] Specifically, the guiding mechanism 13 includes a guide rod and a guide sleeve. The guide rod is fixed to the upper support plate 12, the guide sleeve is slidably sleeved on the guide rod, and the pressing plate 2 is fixedly connected to the guide sleeve.

[0085] It can be understood that in another embodiment, the guiding mechanism 13 includes a guide rail and a slider. The guide rail is fixed to the upper support plate 12, the slider is slidably arranged on the guide rail, and the pressing plate 2 is fixedly connected to the guide rail.

[0086] The following further describes the present application in detail with specific embodiments, and these embodiments should not be construed as limiting the scope claimed by the present application. For those not specifying specific experimental steps or conditions in the embodiments and comparative examples, the operations or conditions of the conventional experimental steps described in the literature in this field can be followed.

[0087] The cell pressing device includes a pressing plate 2 and a pressing table 1 arranged vertically. A clamping plate 5 on one side of the pressing table 1 is connected with an elastic structure, and the clamping plate 5 on the other side of the pressing table 1 is fixed on the other side of the pressing table 1. When installing the separator 3, first fixedly connect one end edge of the separator 3 with the clamping plate 5 connected with the elastic structure, then pull the other end edge of the separator 3 along the upper surface of the pressing table 1 to the other side of the pressing table 1 and fixedly connect it with the corresponding clamping plate 5 to complete the installation of the separator 3; place the cell on the pressing table 1 after installing the separator 3 and perform hot pressing on the cell. The hot pressing temperature is 90 °C and the hot pressing time is 150 seconds.

[0088] Assemble the cell pressing device according to the dimensions of A and B in Table 1, and then perform hot pressing on the cell. For the test results, please refer to Table 1.

[0089] Table 1

[0090]

[0091] As can be seen from Table 1: In Comparative Example 1 and Comparative Example 2, A is shorter and B is longer, A / B is smaller, and there are indentations after hot pressing the cell, which affects the flatness of the cell.

[0092] In Comparative Example 3 and Comparative Example 4, A is longer and B is shorter, A / B is larger, the separator 3 is not easy to install, and the connection between the separator 3 and the clamping plate 5 is prone to break during hot pressing, and thus the separator 3 needs to be replaced, which affects the hot pressing efficiency of the cell; There are no indentations after hot pressing the cells in Examples 1 to 39, ensuring the flatness of the cells. Compared with Examples 1 to 12, Examples 13 to 39 can also ensure that there are no wrinkles after the separator 3 is tightened. Therefore, the values of A, B, and A / B in Examples 13 to 39 are preferred values.

[0093] According to an embodiment of the present invention, on the other hand, there is also provided a battery manufacturing device, including: the above-mentioned cell pressing device.

[0094] In one embodiment, the battery manufacturing device further includes a winding machine or a stacking machine, a welding machine, a liquid injection machine, etc. The winding machine is used to wind the positive electrode sheet, the negative electrode sheet, and the separator into a cell, the stacking machine is used to stack the positive electrode sheet, the negative electrode sheet, and the separator into a cell, the welding machine is used to weld the electrode tabs to ensure the electrical connection of the cell, and the liquid injection machine is used to inject the electrolyte into the cell.

[0095] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery cell pressing device, characterized in that: include: A press platform (1) is used to receive the battery cell, and connection components are respectively arranged on two opposite sides of the press platform (1); An isolation membrane (3) is arranged on the pressing platform (1), and the two end edges of the isolation membrane (3) along the first direction extend out of the upper surface of the pressing platform (1) and extend downward to be connected to the connecting components respectively; The connecting components on at least one side of the press platform (1) are all elastic components, and the elastic components include a fixing frame (4), a clamping plate (5) and an elastic structure. The fixing frame (4) is fixedly arranged, and the clamping plate (5) is connected to one end of the isolation membrane (3). The elastic structure is arranged on the fixing frame (4) and connected to the clamping plate (5). The elastic structure is used to provide installation margin and elastic force for tensioning the isolation membrane (3). The distance between the fixed edge of the clamping plate (5) fixing the isolation membrane (3) and the edge of the upper surface of the press platform (1) close to the elastic component is B. Along the first direction, the length of the isolation membrane (3) flattened on the upper surface of the press platform (1) is A, and 3≤A / B≤7.

3.

2. The battery core pressing device according to claim 1, characterized in that: A is 150mm-220mm, B is 30mm-50mm.

3. The battery core pressing device according to claim 2, characterized in that: The connecting components on one side of the press platform (1) are all elastic components, and the connecting components on the other side of the press platform (1) are all fixed components, A is 205mm-215mm, B is 40mm-50mm, and A / B is 4.1-5.

375.

4. The battery core pressing device according to claim 2, characterized in that: The connecting components on both sides of the press platform (1) are elastic components, A is 185mm-195mm, B is 30mm-40mm, and A / B is 4.75-6.

5.

5. The battery core pressing device according to claim 1, characterized in that: Along a second direction perpendicular to both the first direction and the height direction of the press platform (1), a width C of the isolation film (3) does not exceed a width of the press platform (1).

6. The battery core pressing device according to claim 5, characterized in that: C is 400mm-500mm, 1200≤(A / B)×C≤3650.

7. The battery core pressing device according to claim 1, characterized in that: The elastic structure comprises an elastic member (7) and a guide column (6); a first end of the guide column (6) passes through the fixing frame (4) and is connected to the clamping plate (5); the elastic member (7) is sleeved on the guide column (6); one end of the elastic member (7) abuts against a side of the fixing frame (4) away from the clamping plate (5); and the other end of the elastic member (7) abuts against an end of the guide column (6) away from the clamping plate (5).

8. The battery core pressing device according to claim 7, characterized in that: The guide column (6) is arranged in the vertical direction, the upper end of the guide column (6) passes through the fixing frame (4) and is connected to the clamping plate (5), the elastic member (7) is arranged below the fixing frame (4), the guide column (6) has a mounting portion located below the fixing frame (4), and the elastic member (7) is sleeved on the mounting portion.

9. The battery core pressing device according to claim 7, characterized in that: The guide column (6) is arranged along the first direction, and one end of the guide column (6) close to the pressing platform (1) passes through the fixing frame (4) and is connected to the clamping plate (5). The elastic member (7) is arranged on a side of the fixing frame (4) away from the pressing platform (1). The guide column (6) has a mounting portion located on a side of the fixing frame (4) away from the pressing platform (1), and the elastic member (7) is sleeved on the mounting portion.

10. The battery core pressing device according to claim 8 or 9, characterized in that: A baffle (10) is provided at the second end of the guide column (6), and the elastic member (7) is located between the fixing frame (4) and the baffle (10).

11. The battery core pressing device according to claim 1, characterized in that: The fixing frame (4) comprises a guide column (6) and a baffle (10), the elastic structure comprises a movable plate (9) and an elastic member (7), one end of the guide column (6) is fixed to one side of the press table (1), the other end of the guide column (6) is a free end, the baffle (10) is arranged on the guide column (6), the movable plate (9) is movably placed on the free end and connected to the clamping plate (5), and the elastic member (7) is sleeved on the guide column (6) between the baffle (10) and the movable plate (9).

12. A battery manufacturing device, characterized in that: include: The battery cell pressing device according to any one of claims 1 to 11.

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