Battery cell pressing device and battery manufacturing equipment

Abstract

The utility model 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; the pressing plate is arranged above the pressing table; the isolating membrane extends out of the upper surface of the pressing table along two end edges in the first direction and extends downwards; the connecting assembly comprises a fixing frame, a clamping plate and an elastic structure, the fixing frame is fixedly arranged, the clamping plate is connected with the end edge, the elastic structure comprises a guide column and an elastic piece, at least part of the guide column penetrates through the fixing frame, and one end of the guide column is connected with the clamping plate; one end of the elastic piece abuts against the side, away from the clamping plate, of the fixing frame, and the other end of the elastic piece abuts against the guide column. The fixing frame is arranged between the elastic piece and the clamping plate, so that the stress at the position, where the isolating membrane is fixed, of the clamping plate is reduced, the loosening risk of the fixing position of the clamping plate and the isolating membrane is reduced, and it is ensured that the surface of the battery cell on the pressing table is smooth and free of wrinkles.

Description

Cell pressing equipment and battery manufacturing equipment Technical Field

[0001] This utility model relates to the field of battery manufacturing equipment technology, specifically to a cell pressing device and battery manufacturing equipment. Background Technology

[0002] In the production of lithium-ion batteries, after the cells are prepared, they need to be hot-pressed. Hot pressing is an important process in battery manufacturing, mainly used to improve the internal structure and performance of the cells.

[0003] Typically, a hot pressing device is used to hot press the battery cells. An anti-sticking film is placed on the hot pressing platform to separate the battery cells from the platform. This effectively prevents the battery cells from easily sticking to the surface of the platform when they are heated and pressed during the hot pressing process. After prolonged use, the anti-sticking film gradually wears down and ages, resulting in a decrease in its anti-sticking performance, and eventually, it needs to be replaced.

[0004] To facilitate the replacement of the anti-stick film, a support plate and an elastic element are installed on one side of the hot pressing platform. The support plate is connected to the anti-stick film, and the elastic element directly abuts against the support plate on which the anti-stick film is installed. After the elastic element deforms, it is directly transmitted to the support plate. The support plate is directly subjected to force, which makes it easy for the support plate and the anti-stick film to loosen during subsequent operation. The anti-stick layer cannot be tightened with tension, which affects the subsequent placement of the battery cell on the hot pressing platform, resulting in uneven surface and wrinkles. Summary of the Invention

[0005] In view of this, the present invention provides a cell pressing device and battery manufacturing equipment to solve the problem that when the elastic material directly contacts the tray, the fixed position of the tray and the anti-adhesive film is easily loosened, causing the anti-adhesive layer to fail to tighten under tension.

[0006] In a first aspect, this utility model provides a battery cell pressing device, comprising: a pressing platform for receiving battery cells; a pressing plate disposed above the pressing platform; an isolation membrane disposed on the pressing platform, the isolation membrane extending from the upper surface of the pressing platform and downward along two end edges in a first direction; and a connecting assembly for connecting one end edge, the connecting assembly comprising a fixing frame, a clamping plate, and an elastic structure, the fixing frame being fixedly disposed, the clamping plate being detachably connected to the end edge, each elastic structure comprising a guide post and an elastic element, at least a portion of the guide post passing through the fixing frame, one end of the guide post being connected to the clamping plate, the elastic element being sleeved on the guide post, one end of the elastic element abutting against the side of the fixing frame away from the clamping plate, and the other end of the elastic element abutting against the end of the guide post away from the clamping plate.

[0007] Secondly, this utility model also provides a battery manufacturing apparatus, including: the above-mentioned cell pressing device.

[0008] Beneficial effects: By placing the fixing frame between the elastic element and the clamping plate, one end of the elastic element acts on the fixing frame and the other end acts on the guide post. The elastic element does not act directly on the clamping plate, reducing the force on the clamping plate at the position where the release liner is fixed. This strengthens the structure of the clamping plate with the fixing frame and allows for the slow release of the elastic element, thereby reducing the risk of loosening of the clamping plate and the release liner. It effectively solves the problem that the fixed position of the tray and the anti-adhesive film is prone to loosening when the elastic element is placed between the tray and the fixing frame, resulting in the anti-adhesive layer not being able to tighten with tension. This ensures that the surface of the battery cell on the hot press is flat and wrinkle-free, improving production quality and efficiency. Attached Figure Description

[0009] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0010] Figure 1 is a perspective view of a cell pressing device according to an embodiment of the present utility model;

[0011] Figure 2 is a magnified view of part of E in Figure 1;

[0012] Figure 3 is a partial side view of the cell pressing device shown in Figure 1;

[0013] Figure 4 is a partial front view of the cell pressing device shown in Figure 1;

[0014] Figure 5 is a simplified schematic diagram of the battery cell pressing device shown in Figure 4, showing one end of the isolation membrane fixed.

[0015] Figure 6 is a simplified diagram of another battery cell pressing device according to an embodiment of the present invention;

[0016] Figure 7 is a partially enlarged schematic diagram of G in Figure 6.

[0017] Explanation of reference numerals in the attached figures:

[0018] 1. Pressing platform; 101. First pressing platform; 102. Second pressing platform;

[0019] 2. Pressure plate;

[0020] 3. Separating membrane;

[0021] 4. Fixing frame; 401. Mounting plate; 402. Fixing plate;

[0022] 5. Clamping plate; 501. Base plate; 502. Clamping plate;

[0023] 6. Guide pillars;

[0024] 7. Elastic components;

[0025] 8. Fasteners;

[0026] 10. Baffle;

[0027] 11. Hot-press drive component;

[0028] 12. Upper support plate;

[0029] 13. Guiding mechanism;

[0030] 14. Support platform;

[0031] 15. Frame; 1501. Support plate; 1502. Support leg;

[0032] 16. Supporting columns;

[0033] 17. Lifting drive components;

[0034] 18. Synchronization board. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0036] The embodiments of this utility model are described below with reference to Figures 1 to 7.

[0037] According to an embodiment of the present invention, a battery cell pressing device is provided, comprising: a pressing platform 1, a pressing plate 2, an insulating membrane 3, and a connecting assembly. The pressing platform 1 is used to receive the battery cell; the pressing plate 2 is disposed above the pressing platform 1; the insulating membrane 3 is disposed on the pressing platform 1, extending from the upper surface of the pressing platform 1 and downward along two end edges in a first direction; the connecting assembly is used to connect one end edge, and the connecting assembly includes a fixing frame 4, a clamping plate 5, and an elastic structure. The fixing frame 4 is fixedly disposed, and the clamping plate 5 is detachably connected to the end edge. Each elastic structure includes a guide post 6 and an elastic element 7. At least a portion of the guide post 6 passes through the fixing frame 4, one end of the guide post 6 is connected to the clamping plate 5, and the elastic element 7 is sleeved on the guide post 6. One end of the elastic element 7 abuts against the side of the fixing frame 4 away from the clamping plate 5, and the other end of the elastic element 7 abuts against the end of the guide post 6 away from the clamping plate 5.

[0038] The cell pressing device of this embodiment is detachably connected to the clamping plate 5 and the separator 3. When the separator 3 needs maintenance or replacement, the clamping plate and the separator 3 can be separated to perform timely maintenance or replacement of the separator 3, thereby reducing the occurrence of sudden failures. After long-term disassembly and reassembly, the separator 3 and clamping plate 5 are prone to loosening. If the elastic element 7 acts directly on the clamping plate 5, the risk of loosening of the clamping plate 5 and separator 3 will increase. Therefore, the fixing frame 4 is set between the elastic element 7 and the clamping plate 5. One end of the elastic element 7 acts on the fixing frame 4 and the other end acts on the guide post 6. The elastic element 7 does not act directly on the clamping plate 5, reducing the force on the clamping plate 5 where the separator 3 is fixed. This strengthens the structure of the clamping plate 5 by the fixing frame 4 and allows the elastic element 7 to be released slowly, thereby reducing the risk of loosening of the clamping plate 5 and separator 3. This effectively solves the problem that the fixing position of the tray and the anti-adhesive film is prone to loosening when the elastic element is set between the tray and the fixing frame, causing the anti-adhesive layer to be unable to tighten. This ensures that the surface of the battery cell on the hot press table 1 is flat and wrinkle-free, improving production quality and efficiency.

[0039] It should be noted that the downward extension of the end edge of the isolation membrane 3 means that the end edge of the isolation membrane 3 extends towards a position lower than the upper surface of the pressure table 1 in a direction inclined relative to the third direction.

[0040] In one embodiment, as shown in FIG1, there are two or more elastic structures, which are arranged at intervals along the second direction. By applying force to one end edge of the separator 3 through the two or more elastic structures, the separator 3 can be better tensioned, making the surface of the separator 3 smoother and wrinkle-free.

[0041] Preferably, the number of elastic structures is two or three.

[0042] It is understood that in another embodiment, the number of elastic structures is one, with one elastic structure corresponding to the center of the pressure table 1.

[0043] In one embodiment, as shown in Figure 1, the number of fixing frames 4 is the same as the number of elastic structures and they are set in a one-to-one correspondence. The fixing frames 4 are small in size, saving material usage and reducing costs.

[0044] It is understood that in another embodiment, the number of fixing frames 4 is one, and all elastic structures are set on one fixing frame 4. Setting all elastic structures on one fixing frame 4 reduces the number of fixing frames 4, making assembly easier and improving assembly efficiency.

[0045] In one embodiment, as shown in Figure 4, there are two connecting components. Connecting components are respectively provided on opposite sides of the pressure table 1. The two connecting components are connected to the two ends of the isolation membrane 3 one-to-one. When installing the isolation membrane 3, no matter which end of the isolation membrane 3 is installed first, the other end can generate an installation allowance through the deformation of the elastic component, making it easier to install.

[0046] It is understood that in another embodiment, the number of connecting components is one, a fixing component is set on one side of the pressure table 1, and an elastic component is set on the other side of the pressure table 1. After the isolation membrane 3 is installed and tightened, only one end has elastic deformation, the tension of the isolation membrane 3 is better, and the surface of the isolation membrane 3 is flatter and wrinkle-free.

[0047] In one embodiment, as shown in FIG1, the cell pressing device further includes a support platform 14, on which the pressing platform 1 and the fixing frame 4 are disposed. By supporting the pressing platform 1 and the fixing frame 4 through the support platform 14, a stable foundation can be provided for the pressing platform 1 and the fixing frame 4, ensuring stability during the hot pressing process.

[0048] In one embodiment, as shown in Figures 1 and 2, the guide post 6 is arranged vertically, with its upper end passing through the fixing frame 4 and connecting to the clamping plate 5. The elastic element 7 is disposed below the fixing frame 4, and the guide post 6 has a mounting portion located below the fixing frame 4. The elastic element 7 is sleeved on the mounting portion. When the release diaphragm 3 is tightened, the gravity of the clamping plate 5, the guide post 6, and the elastic element 7, along with the elastic force of the elastic element 7, act together on the release diaphragm 3. The direction of action of the elastic element 7 coincides with the direction of gravity, which allows the force to be directly and effectively transmitted to the release diaphragm 3, providing a more stable tightening effect. Furthermore, the overall stress distribution of the elastic structure is better, reducing the risk of the elastic structure shifting or tilting.

[0049] Furthermore, the fixing frame 4 is a horizontal plate perpendicular to the third direction.

[0050] Understandably, in another embodiment, as shown in Figures 6 and 7, the guide post 6 is arranged along the first direction; in other words, the guide post 6 is horizontally arranged. The end of the guide post 6 near the pressure table 1 passes through the fixing frame 4 and connects to the clamping plate 5. The elastic element 7 is arranged on the side of the fixing frame 4 away from the pressure table 1. The guide post 6 has a mounting portion located on the side of the fixing frame 4 away from the pressure table 1, and the elastic element 7 is sleeved on the mounting portion. The movement of the isolation membrane 3 causes the clamping plate 5 and the guide post 6 to move towards the pressure table 1. The guide post 6 compresses the elastic element 7. At this time, the clamping plate 5, the guide post 6, and the elastic element 7 mainly bear horizontal tension. Compared with the vertical arrangement of the guide post 6, this may lead to greater friction and instability, which may easily cause additional wear. Furthermore, because the direction of action of the elastic element 7 is perpendicular to the direction of gravity, the elastic element 7 needs to overcome more horizontal displacement to provide effective support and buffering. The elastic element 7 may not be able to effectively share the load, resulting in uneven stress on the overall structure.

[0051] Furthermore, the mounting bracket 4 includes a mounting plate 401 and a fixing plate 402. The mounting plate 401 has a through hole for the guide post 6 to pass through, and the fixing plate 402 is disposed on the lower side of the mounting plate 401. The fixing plate 402 is used to fix the bracket 4 to the support platform 14, making it convenient to fix the bracket 4 to the support platform 14.

[0052] Preferably, the mounting plate 401 and the fixing plate 402 are arranged perpendicularly, that is, the fixing frame 4 is L-shaped.

[0053] In one embodiment, as shown in Figures 2 and 3, the distance S1 between the side of the elastic member 7 facing the clamping plate 5 and the side of the clamping plate 5 facing the elastic member 7 is 30mm-70mm. The distance S1 between the side of the elastic member 7 facing the clamping plate 5 and the side of the clamping plate 5 facing the elastic member 7 is also the vertical dimension between the elastic member 7 and the clamping plate 5 in Figure 3.

[0054] Furthermore, the distance between the elastic element 7 and the clamping plate 5 should not be too close or too far. If the distance between the elastic element 7 and the clamping plate 5 is too close, the force at the position where the separator 3 is fixed on the clamping plate 5 will be obvious, and the fixed position of the clamping plate 5 and the separator 3 will easily loosen. If the distance between the elastic element 7 and the clamping plate 5 is too far, the elastic structure cannot transmit the elastic force in time, resulting in a slow movement speed of the separator 3, and the separator 3 cannot be tightened, which will affect the subsequent hot pressing of the battery cell. The unevenness of the separator 3 will cause wrinkles on the surface of the battery cell.

[0055] Therefore, the distance between the elastic element 7 and the clamping plate 5 is set to 30mm-70mm. This not only ensures that the force at the position where the separator 3 is fixed on the clamping plate 5 is appropriate, preventing the clamping plate 5 and the separator 3 from easily coming loose, but also allows the elastic structure to transmit the elastic force in time, ensuring that the moving speed of the separator 3 is appropriate and that the separator 3 can be tensioned. The tensioned separator 3 can ensure that its surface is flat, without wrinkles or looseness, thereby improving the flatness of the cell surface after hot pressing.

[0056] Preferably, S1 is 30mm, 40mm, 50mm, 60mm, 70mm, or within any two of the above values.

[0057] In one embodiment, as shown in Figures 2 and 3, the ratio of the height H3 of S1 to that of the fixing frame 4 along the extension direction of the guide post 6 is 1.1-2. The height H3 of the fixing frame 4 along the extension direction of the guide post 6 is also the vertical dimension of the fixing frame 4 in Figure 3.

[0058] Furthermore, S1 / H3 cannot be too large or too small. If S1 / H3 is too large, the elastic element 7 will need more time to compress or rebound to the designated position, resulting in a slower response speed. It also makes the guide post 6 longer, which is more prone to swaying or vibration when subjected to lateral forces, thus reducing stability. If S1 / H3 is too small, the stroke of the clamping plate 5 will be limited, which is not conducive to tightening the separator 3, thereby affecting the flatness of the battery cell pressing.

[0059] Therefore, with S1 / H3 in the range of 1.1-2, not only is the response speed and stability guaranteed, but the stroke of the clamping plate 5 is also guaranteed to be within a certain range, which is conducive to tightening the separator 3 and ensuring the flatness of the battery cell.

[0060] Preferably, S1 / H3 is 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9 or within the range of any two of the above values.

[0061] In one embodiment, as shown in Figures 2 and 3, the distance S2 between the centerlines of two adjacent elastic structures is 180mm-250mm along a second direction perpendicular to the first direction and the height direction of the pressure table 1. Multiple elastic structures can improve the overall structural strength and ensure stable movement of the isolation membrane 3, thereby effectively tensioning the isolation membrane 3.

[0062] Furthermore, the spacing between the two elastic structures should not be too large or too small. If the spacing between the two elastic structures is too large, the difference in deformation between the two elastic structures will prevent the separator 3 from moving accurately left and right, resulting in asymmetrical movement of the separator 3. The separator 3 is prone to wrinkling, which will affect the flatness of the battery cell. If the spacing between the two elastic structures is too small, the clamping plate 5 will deform under stress, and the clamping plate 5 and the separator 3 are prone to loosening.

[0063] Therefore, the spacing between the two elastic structures is in the range of 180mm-250mm to ensure that the left and right movement of the isolation membrane 3 is symmetrical, to avoid wrinkles in the isolation membrane 3, and to reduce the risk of loosening between the clamping plate 5 and the isolation membrane 3, thus ensuring reliable fixation between the clamping plate 5 and the isolation membrane 3.

[0064] Preferably, S2 is 180mm, 190mm, 200mm, 210mm, 220mm, 230mm, 240mm, 250mm or within any two of the above values.

[0065] Specifically, as shown in Figures 1 and 2, the movement of the guide post 6 relative to the fixed frame 4 can guide the movement of the isolation membrane 3, ensuring more stable movement of the isolation membrane 3. Using the guide post 6 to support the elastic element 7 avoids the risk of failure due to large deformation distance of the elastic element 7, thereby extending the service life of the elastic element 7.

[0066] Specifically, when installing the isolation membrane 3, first connect one end of the isolation membrane 3 to the clamping plate 5 on one side of the pressure table 1, then tighten the other end of the isolation membrane 3, causing one end of the isolation membrane 3, the clamping plate 5, the guide post 6 and the baffle 10 to move upward. The baffle 10 compresses the elastic element 7, and then fix the other end of the isolation membrane 3. After the isolation membrane 3 is fixed, the elastic element 7 applies elastic force to the isolation membrane, so that the isolation membrane 3 is in a taut state.

[0067] Furthermore, placing the fixing frame 4 between the elastic member 7 and the clamping plate 5 can better tension the isolation membrane 3 on the surface of the pressing table 1, avoiding unevenness or wrinkles in the isolation membrane 3 from affecting subsequent cell pressing and cell structure damage.

[0068] Specifically, the elastic element 7 is a spring, which is convenient to use and inexpensive. It is understandable that the elastic element 7 could also be a cylinder with elasticity, etc.

[0069] In one embodiment, as shown in Figures 2, 3, and 5, the ratio of the height H1 of the guide post 6 to the height H2 of the elastic member 7 before compression is 1.1-1.7 in the extending direction of the guide post 6. The height H1 of the guide post 6 is also the vertical dimension of the guide post 6 in Figure 3, and the height H2 of the elastic member 7 before compression is also the vertical dimension of the elastic member 7 before compression in Figure 5.

[0070] Furthermore, the ratio of the height H1 of the guide post 6 to the height H2 of the elastic element 7 before compression should not be too small or too large. If the ratio is too large, the proportion of the elastic element 7 will be too small, and the elastic element 7 will not be able to quickly transmit the force to the separator 3 in time. As a result, the separator 3 will not be in a good tensioned state, which will affect the flatness of the battery cell. If the ratio is too small, the proportion of the elastic element 7 will be too large, and the separator 3 will move a long distance, which may lead to failure.

[0071] Therefore, the height H1 of the guide post 6 and the height H2 of the elastic element 7 before compression are within the range of 1.1-1.7. The proportion of the elastic element 7 is appropriate, and the elastic element 7 can quickly transmit the force to the isolation membrane 3 in a timely manner, so as to achieve a good tensioning effect of the isolation membrane 3 and an appropriate moving distance of the isolation membrane 3, thus avoiding the risk of failure.

[0072] Preferably, the ratio of H1 / H2 is 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7 or falls within the range of any two of the above values.

[0073] In one embodiment, as shown in Figures 2 and 3, the ratio of the height H1 of the guide post 6 to the height H3 of the fixing frame 4 in the extending direction of the guide post 6 is 3-5. The height H3 of the fixing frame 4 is also the vertical dimension shown in Figure 3.

[0074] Furthermore, if the ratio of the height H1 of the guide post 6 to the height H3 of the fixing frame 4 is too small, the height of the guide post 6 is too small, and the elastic element 7 cannot evenly transmit the force to the fixing frame 4; if the ratio of the height H1 of the guide post 6 to the height H3 of the fixing frame 4 is too large, the strength of the fixing frame 4 is too weak, and the risk of the isolation membrane 3 and the clamping plate 5 becoming loose increases.

[0075] Therefore, the ratio of the height H1 of the guide post 6 to the height H3 of the fixing frame 4 is in the range of 3-5. This not only ensures that the elastic element 7 transmits the force evenly to the fixing frame 4, but also ensures the structural strength of the fixing frame 4 and reduces the risk of the isolation membrane 3 and the clamping plate 5 becoming loose.

[0076] Preferably, H1 / H3 is 3, 3.2, 3.4, 3.6, 3.8, 4, 4.2, 4.4, 4.6, 4.8, 5, or falls within the range of any two of the above values.

[0077] In one embodiment, as shown in Figures 2 and 3, the clamping plate 5 is provided with fasteners 8 for securing the isolation membrane 3. The fasteners 8 are detachably connected to the clamping plate 5, and there are multiple fasteners 8 arranged along the extension 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 membrane 3 along the extension direction of the end edge is 0.3-1.375. By securing the isolation membrane 3 with multiple fasteners 8, the isolation membrane 3 is more firmly fixed to the clamping plate 5, preventing the isolation membrane 3 from becoming loose.

[0078] Furthermore, the ratio of d×L1 to C should not be too small or too large. If the ratio of d×L1 to C is too small, the isolation membrane 3 requires a large deformation of the elastic element 7 to be tensioned. At this time, the stress concentration of the fastener 8 poses a risk of structural failure. If the ratio of d×L1 to C is too large, the isolation membrane 3 will be tensioned quickly. If the size of the fastener 8 is too large or the distance is too far, there is a risk of loosening.

[0079] Therefore, the ratio of d×L1 to C is in the range of 0.3-1.375. On the one hand, this can avoid the risk of fastener 8 failure, and on the other hand, it can reduce the risk of loosening between the isolation membrane 3 and the clamping parts.

[0080] Specifically, d ranges from 3mm to 5mm, L1 ranges from 50mm to 110mm, and C ranges from 400mm to 500mm.

[0081] Preferably, d is 3mm, 3.2mm, 3.4mm, 3.6mm, 3.8mm, 4mm, 4.2mm, 4.4mm, 4.6mm, 4.8mm, 5mm or within any two of the above values; L1 is 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, 110mm or within any two of the above values; and C is 400mm, 410mm, 420mm, 430mm, 440mm, 450mm, 460mm, 470mm, 480mm, 490mm, 500mm or within any two of the above values.

[0082] It should be noted that the units of S1, S2, H1, H2, H3, d, L1, and C are all mm. The first direction, the second direction, and the third direction can be referred to in Figure 1. The vertical direction is the third direction in Figure 1. The first direction, the second direction, and the third direction are perpendicular to each other.

[0083] In one embodiment, as shown in Figures 2 and 3, the clamping plate 5 includes a base plate 501 and a clamping plate 502. The end edge of the separator 3 is clamped between the base plate 501 and the clamping plate 502, and the base plate 501 and the clamping plate 502 are detachably connected by fasteners 8. The base plate 501 and the clamping plate 502 can clamp the end edge of the separator 3, improving the fixation reliability between the separator 3 and the clamping plate 5 and effectively preventing the separator 3 and the clamping plate 5 from loosening.

[0084] In one embodiment, the clamping plate 502 has a plurality of spaced protrusions on its surface facing the base plate 501. The protrusions are used to press the isolation membrane 3. The protrusions ensure that the tension of the isolation membrane 3 disposed between the elastic members 7 is uniform, and ensure that the isolation membrane 3 is flat and wrinkle-free.

[0085] Furthermore, concave portions are formed between adjacent convex portions, at which point the convex portions and concave portions alternate to form a concave-convex structure.

[0086] In one embodiment, the connecting assembly further includes a baffle 10. The lower end of the guide post 6 is provided with the baffle 10. One end of the elastic member 7 abuts against the fixing frame 4 and the other end abuts against the baffle 10. The other end of the elastic member 7 is restricted by the baffle 10, that is, the elastic member 7 is located between the fixing frame 4 and the baffle 10. When the isolation membrane 3 is tensioned, the elastic force of the elastic member 7 is applied to the baffle 10, thereby driving the guide post 6 and the clamping plate 5 to move downward. The movement of the clamping plate 5 pulls the isolation membrane 3, thereby achieving the tensioning of the isolation membrane 3.

[0087] In one embodiment, two connecting components are provided, with each end of the isolation membrane 3 connected to a corresponding connecting component. Alternatively, one connecting component may be provided, with one end of the isolation membrane 3 connected to the connecting component and the other end of the isolation membrane 3 fixed to one side of the pressure table 1.

[0088] In one embodiment, as shown in Figures 1, 4 and 5, the pressing platform 1 includes a first pressing platform 101 and a second pressing platform 102 arranged along a first direction; the first pressing platform 101 is vertically and vertically arranged along a third direction, and the cell pressing device further includes a lifting drive 17, which is connected to the first pressing platform 101. The lifting drive 17 drives the first pressing platform 101 to move along the third direction, so that the first pressing platform 101 protrudes from the surface of the second pressing platform 102 or retracts to be flush with the surface of the second pressing platform 102.

[0089] When placing the battery cell, the lifting drive 17 drives the first pressure platform 101 to rise, thereby lifting the first pressure platform 101 and the middle part of the separator 3. The movement of the separator 3 drives the clamping plate 5, guide post 6 and baffle 10 to move upward together. The baffle 10 compresses the elastic member 7. When the first pressure platform 101 rises to a certain distance, the robotic arm holding the battery cell places the battery cell on the separator 3 on the first pressure platform 101. Then the lifting drive 17 drives the first pressure platform 101 to descend until it is flush with the second pressure platform 102. During the descent of the first pressure platform 101, the elastic member 7 applies an elastic force to the baffle 10, thereby tightening the separator 3.

[0090] When the gripper of the robotic arm transfers the battery cell to the first pressure platform 101, the first pressure platform 101 lifts the middle of the battery cell, at which point the gripper is suspended in the air. Releasing the gripper allows the battery cell to be retracted. After the gripper is retracted, the battery cell rests on the first pressure platform 101. Then, the first pressure platform 101 descends until it is flush with the surface of the second pressure platform 102. It is evident that during the placement of the battery cell, the gripper never contacts the second pressure platform 102, thus preventing the battery cell from shaking or tipping over when the gripper is retracted.

[0091] In one embodiment, there are two second pressure platforms 102, which are arranged on opposite sides of the first pressure platform 101. Each second pressure platform 102 has a length L along the first direction. The arrangement of two second pressure platforms 102 increases the width of the pressure platform 1 in the first direction, which can heat-press larger-sized battery cells, thus broadening its applicability. Furthermore, after the first pressure platform 101 is raised, the battery cell, after being placed on the first pressure platform 101, protrudes from the first pressure platform 101 at both ends along the first direction, meaning that both ends of the battery cell are suspended. This makes the battery cell more stably supported on the first pressure platform 101, effectively preventing the battery cell from swaying during lifting and lowering due to only one end being suspended.

[0092] Furthermore, the first pressure platform 101 and the second pressure platform 102 are both mounted on the support platform 14. The support platform 14 supports the first pressure platform 101 and the second pressure platform 102. When the first pressure platform 101 and the second pressure platform 102 are flush, the first pressure platform 101 can be kept stable, thereby improving the stability during hot pressing.

[0093] In one embodiment, a first heating element is provided on the second pressing platform 102 for heating the second pressing platform 102. The first heating element is directly integrated into the second pressing platform 102, which can make the heat more evenly distributed across the entire plate surface, thereby ensuring that the battery cell is heated evenly during the hot pressing process.

[0094] Furthermore, a second heating element is provided on the first pressing platform 101, which is used to heat the first pressing platform 101. The second heating element is directly integrated into the first pressing platform 101, which allows heat to be distributed more evenly across the entire platen surface, thereby ensuring that the battery cell is heated evenly during the hot pressing process. The arrangement of the first and second heating elements can quickly and accurately reach the required heating temperature, which can significantly shorten the hot pressing cycle and improve the overall efficiency of the production line.

[0095] It is understood that, in another embodiment, the first pressure platform 101 may not have a second heating element. The gap between the first pressure platform 101 and the second pressure platform 102 is 0.1mm-0.5mm, and the second pressure platform 102 heats the first pressure platform 101 through heat conduction. After the second pressure platform 102 is heated, its heat is transferred to the first pressure platform 101. The gap between the first pressure platform 101 and the second pressure platform 102 can also ensure the heat conduction effect and avoid friction between the first pressure platform 101 and the second pressure platform 102 when the first pressure platform 101 is raised and lowered, thus extending the service life of the pressure platform 1.

[0096] In one embodiment, along a second direction perpendicular to the first direction and the height direction of the pressure table 1, the length of the first pressure table 101 is greater than the length of the second pressure table 102, which facilitates the connection between the first pressure table 101 and the lifting drive component 17.

[0097] It is understood that, in another embodiment, the length of the first pressing platform 101 is equal to the length of the second pressing platform 102.

[0098] In one embodiment, the first pressure platform 101 has protrusions at both ends along its length that extend beyond the second pressure platform 102, and each protrusion is connected to the drive end of the lifting drive member 17. The drive end of the lifting drive member 17 is connected to the two protrusions, ensuring that the pressure platform 1 does not tilt or shake during the lifting process, so that the first pressure platform 101 can be lifted and lowered smoothly.

[0099] In one embodiment, the cell pressing device further includes a frame 15, on which a first pressing platform 101, a second pressing platform 102, and a lifting drive 17 are mounted. The frame 15 provides a robust support base, ensuring that the first pressing platform 101 and the second pressing platform 102 remain stable during operation.

[0100] In one embodiment, the frame 15 includes a support plate 1501 with guide holes. A lifting drive 17 is disposed below the support plate 1501, and a guide shaft is fixed to the bottom of the protrusion. The lower end of the guide shaft passes through the guide hole and connects to the drive end of the lifting drive 17. The precise fit between the guide hole and the guide shaft ensures the accurate vertical movement of the first pressing table 101, effectively reducing or eliminating lateral displacement and ensuring that the pressing table 101 accurately reaches the predetermined position each time.

[0101] Furthermore, the number of lifting drive components 17 is one, and the cell pressing device also includes a synchronization plate 18. All guide shafts are connected to the synchronization plate 18, and the drive end of the lifting drive component 17 is connected to the synchronization plate 18, thereby reducing the number of drive components and saving costs.

[0102] It is understood that in another embodiment, there are two lifting drive components 17, which are fixed on the bottom surface of the support plate 1501 and connected to the two protrusions one by one.

[0103] It is understood that in another embodiment, the frame 15 includes a support plate 1501, and a lifting drive component 17 is disposed on the top surface of the support plate 1501. The driving end of the lifting drive component 17 is directly connected to the protrusion. In this case, there are two lifting drive components 17, and the two lifting drive components 17 are connected to the two protrusions one by one.

[0104] In one embodiment, the frame 15 is used to support components such as the pressure table 1 and the pressure plate 2. An upper support plate 12 is fixed above the frame 15. The pressure plate 2 is movably mounted on the upper support plate 12. The upper support plate 12 is provided with a hot pressing drive 11 that drives the pressure plate 2 to move up and down. The hot pressing drive 11 drives the pressure plate 2 to descend, thereby hot pressing the battery cell.

[0105] Furthermore, the frame 15 includes a support plate 1501 and several support legs 1502. The support platform 14 is fixed on the support plate 1501, and the several support legs 1502 are disposed on the bottom surface of the support plate 1501, and the support legs 1502 are used to support the support plate 1501. A support column 16 is provided between the upper support plate 12 and the support plate 1501, and the upper support plate 12 and the components thereon are supported by the support column 16.

[0106] Furthermore, a guide mechanism 13 is provided between the upper support plate 12 and the pressure plate 2. The guide mechanism 13 can move the pressure plate 2 to lift and lower, making the movement of the pressure plate 2 more stable and improving the hot pressing effect.

[0107] Specifically, the guiding mechanism 13 includes a guide rod and a guide sleeve. The guide rod is fixed to the upper support plate 12, and the guide sleeve is slidably sleeved on the guide rod. The pressure plate 2 is fixedly connected to the guide sleeve.

[0108] It is understood that in another embodiment, the guide mechanism 13 includes a guide rail and a slider, the guide rail is fixed to the upper support plate 12, the slider is slidably disposed on the guide rail, and the pressure plate 2 is fixedly connected to the guide rail.

[0109] According to an embodiment of the present invention, another aspect provides a battery manufacturing apparatus, including the aforementioned cell pressing device.

[0110] In one embodiment, the battery manufacturing equipment further includes a winding machine or stacking machine, a welding machine, an electrolyte injection machine, etc. The winding machine is used to wind the positive electrode sheet, the negative electrode sheet and the separator into a battery cell; the stacking machine is used to stack the positive electrode sheet, the negative electrode sheet and the separator into a battery cell; the welding machine is used to weld the electrode tabs to ensure the electrical connection of the battery cell; and the electrolyte injection machine is used to inject electrolyte into the battery cell.

[0111] Although embodiments of the present invention have been 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: Pressing platform (1), used to receive battery cells; A pressure plate (2) is disposed above the pressure table (1); an isolation membrane (3) is disposed on the pressure table (1), the isolation membrane (3) extends from the upper surface of the pressure table (1) and downward along two end edges in a first direction; a connecting assembly is used to connect one of the end edges, the connecting assembly includes a fixing frame (4), a clamping plate (5) and an elastic structure, the fixing frame (4) is fixedly disposed, the clamping plate (5) is detachably connected to the end edge, the elastic structure includes a guide post (6) and an elastic element (7), at least a portion of the guide post (6) passes through the fixing frame (4), one end of the guide post (6) is connected to the clamping plate (5), the elastic element (7) is sleeved on the guide post (6), one end of the elastic element (7) abuts against the side of the fixing frame (4) away from the clamping plate (5), and the other end of the elastic element (7) abuts against the end of the guide post (6) away from the clamping plate (5).

2. The cell pressing device according to claim 1, characterized in that, The number of elastic structures is one, and one elastic structure is provided in the middle of the pressure table (1).

3. The cell pressing device according to claim 1, characterized in that, The number of elastic structures is two or more, and the two or more elastic structures are arranged at intervals along the second direction.

4. The cell pressing device according to claim 3, characterized in that, The number of the fixing frame (4) is one, and all the elastic structures are set on one fixing frame (4), or the number of the fixing frame (4) is the same as the number of the elastic structures and they are set in a one-to-one correspondence.

5. The cell pressing device according to claim 1, characterized in that, The number of the connecting components is two. The connecting components are respectively arranged on the opposite sides of the pressure table (1), and the two connecting components are connected to the two end edges of the isolation membrane (3) one by one.

6. The cell pressing device according to claim 1, characterized in that, The cell pressing device further includes a support platform (14), the pressing table (1) is disposed on the support platform (14), and the fixing frame (4) is disposed on the support platform (14).

7. The cell pressing device according to claim 1, characterized in that, The guide post (6) is arranged in a vertical direction. The upper end of the guide post (6) passes through the fixing frame (4) and is connected to the clamping plate (5). The elastic element (7) is arranged below the fixing frame (4). The guide post (6) has a mounting part located below the fixing frame (4). The elastic element (7) is sleeved on the mounting part.

8. The cell pressing device according to claim 1, characterized in that, The guide post (6) is arranged along the first direction. One end of the guide post (6) near the pressure table (1) passes through the fixing frame (4) and is connected to the clamping plate (5). The elastic member (7) is arranged on the side of the fixing frame (4) away from the pressure table (1). The guide post (6) has a mounting part located on the side of the fixing frame (4) away from the pressure table (1). The elastic member (7) is sleeved on the mounting part.

9. The cell pressing device according to claim 8, characterized in that, The mounting bracket (4) includes a mounting plate (401) and a fixing plate (402). The mounting plate (401) has a through hole for the guide post (6) to pass through, and the fixing plate (402) is disposed on the lower side of the mounting plate (401).

10. The cell pressing device according to claim 1, characterized in that, The distance S1 between the side of the elastic member (7) facing the clamping plate (5) and the side of the clamping plate (5) facing the elastic member (7) is 30mm-70mm.

11. The cell pressing device according to claim 10, characterized in that, The ratio of the height H3 of S1 to that of the fixing frame (4) along the extension direction of the guide post (6) is 1.1-2.

12. The cell pressing device according to claim 1, characterized in that, Along a second direction perpendicular to the first direction and the height direction of the pressure table (1), the distance S2 between the center lines of two adjacent elastic structures is 180mm-250mm.

13. The cell pressing device according to claim 1, characterized in that, In the extending direction of the guide post (6), the ratio of the height H1 of the guide post (6) to the height H2 of the elastic member (7) before compression is 1.1-1.

7.

14. The cell pressing device according to claim 1, characterized in that, In the extending direction of the guide post (6), the ratio of the height H1 of the guide post (6) to the height H3 of the fixing frame (4) is 3-5.

15. The cell pressing device according to claim 1, characterized in that, The clamping plate (5) is provided with fasteners (8) for fastening the isolation membrane (3). The fasteners (8) are detachably connected to the clamping plate (5). There are multiple fasteners (8), which are arranged along the extension 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 membrane (3) along the extension direction of the end edge is 0.3-1.

375.

16. The cell pressing device according to claim 15, characterized in that, The range of d is 3mm-5mm, the range of L1 is 50mm-110mm, and the range of C is 400mm-500mm.

17. The cell pressing device according to claim 1, characterized in that, The clamping plate (5) includes a base plate (501) and a clamping plate (502). The end edge of the isolation membrane (3) is clamped between the base plate (501) and the clamping plate (502). The base plate (501) and the clamping plate (502) are detachably connected by fasteners (8).

18. The cell pressing device according to claim 17, characterized in that, The clamping plate (502) has a plurality of spaced protrusions on its surface facing the base plate (501), the protrusions being used to press the isolation membrane (3).

19. A battery manufacturing apparatus, characterized in that, include: The cell pressing device according to any one of claims 1 to 18.

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