Battery cell hot-pressing device and battery cell production equipment

Abstract

The application relates to an electric core hot pressing device and an electric core production equipment, which comprises a hot pressing frame, a hot pressing mechanism arranged on the hot pressing frame, the hot pressing mechanism comprising an upper hot pressing plate and a lower hot pressing plate for jointly extruding an electric core, and a driving mechanism for driving the upper hot pressing plate and the lower hot pressing plate to move towards or away from each other; the hot pressing mechanism is configured to make the pressure on the central region of the electric core greater than the pressure on the edge region of the electric core when the driving mechanism drives the upper hot pressing plate and the lower hot pressing plate to jointly extrude the electric core from a starting point to an ending point. The application makes the pressure on the central region of the electric core greater than the pressure on the edge region after the electric core is pressed by the upper hot pressing plate and the lower hot pressing plate. In turn, the porosity of the central region of the electric core is smaller than the porosity of the edge region, the migration speed of lithium ions in the edge region of the electric core is reduced, the lithium precipitation of the negative electrode edge is reduced, the capacity retention rate of the battery is improved, and the service life of the electric core is prolonged.

Description

Technical Field

[0001] This application relates to the field of lithium battery manufacturing technology, and in particular to a cell hot pressing device and cell production equipment. Background Technology

[0002] As the mainstream energy storage technology, lithium-ion batteries are facing increasing challenges due to the continuous improvement in energy density and fast-charging performance, particularly the problem of lithium plating at the anode edge. Currently, the industry generally tries to alleviate this problem by optimizing electrode coating processes, adjusting the N / P ratio, and using high-pressure solid graphite anodes. However, these methods often have limited effectiveness or come at the cost of sacrificing energy density.

[0003] In recent years, a series of innovative strategies have emerged, including zoned design of positive electrode active materials, addition of functional coatings, edge modification coating of electrode sheets, and thermal management technology combined with insulating films. These solutions work synergistically from multiple dimensions such as material design, structural control, and external thermal management, aiming to comprehensively suppress lithium plating behavior and further improve the cycle stability and safety performance of batteries.

[0004] However, existing technologies have several limitations in addressing the lithium plating problem at the edge of the negative electrode in lithium-ion batteries. First, at the material level, using modified materials such as high-pressure fast-charging graphite not only faces complex processes and increased costs, but also restricts further improvements in energy density.

[0005] Secondly, in terms of structural design, while increasing the negative electrode overhang area can provide more buffer margin, it significantly exacerbates the migration lag and redistribution unevenness of lithium ions during charging and discharging in practical applications. At the same time, due to ineffective weight gain and volume occupation, the volumetric energy density of the battery decreases.

[0006] Research has revealed that as the number of cycles in a lithium-ion battery increases, lithium plating gradually appears at the edge of the negative electrode. This phenomenon is mainly due to the presence of the Overhang region (hereinafter referred to as the "OH region") at the edge of the negative electrode, which causes a concentration gradient of lithium ions to form between the normal region and the OH region during charging and discharging, triggering a concentration diffusion effect.

[0007] Specifically, during charging, lithium ions are inserted into the negative electrode, and some lithium ions diffuse from the edge of the normal region to the OH region. However, during discharging, especially under high-rate conditions, lithium ions in the OH region cannot be extracted and migrated back to the positive electrode in time, resulting in lithium residue in the negative electrode. Under cyclic charge and discharge, the insertion of these residual lithium ions and lithium extracted from the positive electrode exceeds the loading capacity of the negative electrode, thus causing lithium plating.

[0008] The cell hot pressing device is used in the cell assembly process to apply pressure to the cell in a high-temperature environment to promote the tight bonding between key materials such as positive and negative electrode plates, separators, and active material coatings, thereby reducing interface resistance and improving the energy conversion efficiency and discharge performance of the battery.

[0009] However, in the actual operation of the hot pressing process for battery cells, the upper and lower hot pressing plates exert the same pressure on the central region and OH region of the battery cell. This results in the average porosity of the negative electrode active material coating located in the central region of the negative electrode foil being the same as the average porosity of the negative electrode active material coating located in the OH region of the negative electrode foil, which is detrimental to suppressing lithium plating at the edges of the battery cell negative electrode sheet. Summary of the Invention

[0010] This application provides a battery cell hot pressing device and battery cell production equipment to solve the problem in related technologies where the upper and lower hot pressing plates of the battery cell press exert the same pressure on the central region and OH region of the battery cell, which is not conducive to suppressing lithium deposition at the edge of the negative electrode sheet.

[0011] The first aspect of this application provides a battery cell hot pressing device, comprising: A hot press frame is provided with a hot press mechanism, which includes an upper hot press plate and a lower hot press plate for jointly extruding the battery cell, and a drive mechanism for driving the upper hot press plate and the lower hot press plate to move closer to or further away from each other. The hot pressing mechanism is configured such that when the driving mechanism drives the upper and lower hot pressing plates to jointly press the battery cell from the starting point to the ending point, the pressure on the central region of the battery cell is greater than the pressure on the edge region of the battery cell.

[0012] In some embodiments, the upper hot press plate includes an upper left press plate, an upper middle press plate, and an upper right press plate arranged in parallel. The upper middle press plate is used to press the central region of the battery cell, and the upper left press plate and the upper right press plate are used to press the edge regions at both ends of the battery cell, respectively.

[0013] In some embodiments, the driving mechanism includes a first pressing mechanism, a second pressing mechanism, and a third pressing mechanism that are respectively connected to the upper left pressure plate, the upper middle pressure plate, and the upper right pressure plate; When the upper and lower hot pressure plates jointly compress the battery cell from the starting point to the ending point, the pressure value of the second pressure mechanism is greater than the pressure values ​​of the first and third pressure mechanisms.

[0014] In some embodiments: the driving mechanism includes a pressing mechanism and a pressure equalizing plate connected to the end of the pressing mechanism, the upper left pressure plate and the upper right pressure plate are connected to the two ends of the pressure equalizing plate by an elastic member, and the upper middle pressure plate is fixed in the middle of the pressure equalizing plate and located between the upper left pressure plate and the upper right pressure plate.

[0015] In some embodiments: the elastic element includes a first elastic pad connected between the upper left pressure plate and the equalizing plate, and a second elastic pad connected between the upper right pressure plate and the equalizing plate; The bottom surfaces of the upper left pressure plate, upper middle pressure plate, and upper right pressure plate are flush, and the thickness of the upper middle pressure plate is greater than the thickness of the upper left pressure plate and the upper right pressure plate.

[0016] In some embodiments: the elastic element includes a first disc spring connected between the upper left pressure plate and the pressure equalizing plate, and a second disc spring connected between the upper right pressure plate and the pressure equalizing plate; The bottom surfaces of the upper left pressure plate, upper middle pressure plate, and upper right pressure plate are flush, and the thickness of the upper middle pressure plate is greater than the thickness of the upper left pressure plate and the upper right pressure plate.

[0017] In some embodiments: the upper hot press plate has an upper pressing surface near the bottom surface of the lower hot press plate. The upper pressing surface includes an upper middle pressing surface for applying pressure to the central area of ​​the battery cell, and an upper left pressing surface and an upper right pressing surface located on both sides of the upper middle pressing surface for applying pressure to the edge area of ​​the battery cell, respectively. The upper middle pressing surface protrudes from the upper left pressing surface and the upper right pressing surface.

[0018] In some embodiments: the lower hot platen has a lower pressure surface near the top surface of the upper hot platen. The lower pressure surface includes a lower middle pressure surface for applying pressure to the central region of the battery cell, and a lower left pressure surface and a lower right pressure surface located on both sides of the lower middle pressure surface for applying pressure to the edge region of the battery cell, respectively. The lower middle pressure surface protrudes from the lower left pressure surface and the lower right pressure surface.

[0019] In some embodiments: the projections of the upper middle pressure surface and the lower middle pressure surface in the height direction coincide with each other, the projections of the upper left pressure surface and the lower left pressure surface in the height direction coincide with each other, and the projections of the upper right pressure surface and the lower right pressure surface in the height direction coincide with each other. The widths of the upper left pressing surface and the lower left pressing surface are both 5-60mm, and the widths of the upper right pressing surface and the lower right pressing surface are both 5-60mm.

[0020] A second aspect of this application provides a battery cell production apparatus, including the battery cell hot pressing device described in any of the above embodiments.

[0021] The beneficial effects of the technical solution provided in this application include: This application provides a battery cell hot pressing device and a lithium-ion battery cell. The battery cell hot pressing device of this application is provided with a hot pressing frame, on which a hot pressing mechanism is provided. The hot pressing mechanism includes an upper hot pressing plate and a lower hot pressing plate for jointly pressing the battery cell, and a driving mechanism for driving the upper hot pressing plate and the lower hot pressing plate to move closer to or further away from each other. The hot pressing mechanism is configured such that when the driving mechanism drives the upper hot pressing plate and the lower hot pressing plate to jointly press the battery cell from the starting point to the ending point, the pressure on the central region of the battery cell is greater than the pressure on the edge region of the battery cell.

[0022] Therefore, in the cell hot-pressing device of this application, when the driving mechanism drives the upper and lower hot-pressing plates to jointly compress the cell from the starting point to the ending point, the pressure on the central region of the cell after being pressed by the upper and lower hot-pressing plates is greater than the pressure on the edge region. This results in the porosity of the central region of the cell being lower than that of the edge region, reducing the migration speed of lithium ions in the edge region of the cell, reducing lithium deposition at the negative electrode edge, and helping to improve the battery's capacity retention rate and extend the cell's lifespan. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a front view of the structure of the battery cell hot pressing device according to an embodiment of this application; Figure 2 This is a front view of the structure of a battery cell hot pressing device according to another embodiment of this application; Figure 3 This is a front view of the structure of a battery cell hot pressing device according to another embodiment of this application; Figure 4 This is a front view of the upper hot press plate structure in another embodiment of this application; Figure 5 This is a front view of the hot press plate structure in the embodiment of this application; Figure 6 This is a top view of the structure of the battery cell after hot pressing according to an embodiment of this application.

[0025] Figure label: 10. Hot press frame; 20. Hot press mechanism; 21. Upper hot press plate; 22. Lower hot press plate; 30. Drive mechanism; 31. First pressure applying mechanism; 32. Second pressure applying mechanism; 33. Third pressure applying mechanism; 34. Lower pressure mechanism; 35. Equalizing plate; 40. Battery cell; 41. Central area; 42. Edge area; 211. Upper middle pressure plate; 212. Upper left pressure plate; 213. Upper right pressure plate; 214. Elastic element; 215. Upper middle pressure surface; 216. Upper left pressure surface; 217. Upper right pressure surface; 221. Lower middle pressure surface; 222. Lower left pressure surface; 223. Lower right pressure surface. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0027] This application provides a battery cell hot pressing device and battery cell production equipment, which can solve the problem in the related art where the upper and lower hot pressing plates of the battery cell press exert the same pressure on the central region and OH region of the battery cell, which is not conducive to suppressing lithium deposition at the edge of the negative electrode sheet.

[0028] See Figures 1 to 3 and Figure 6 As shown, the first aspect of this application provides a battery cell hot pressing device, comprising: The hot press frame 10 includes a base and a top plate fixed to the base by columns. A hot press mechanism 20 is provided on the hot press frame 10. The hot press mechanism 20 includes an upper hot press plate 21 and a lower hot press plate 22 for jointly pressing the battery cell 40, and a drive mechanism 30 for driving the upper hot press plate 21 and the lower hot press plate 22 to move closer to or further away from each other.

[0029] The drive mechanism 30 is fixed on the top plate, the lower hot plate 22 is fixed on the base, and the upper hot plate 21 is connected to the output end of the drive mechanism 30. The drive mechanism 30 drives the upper hot plate 21 to move up and down through telescopic movement, thereby driving the upper hot plate 21 to move up and down so that the upper hot plate 21 and the lower hot plate 22 can move closer to each other or further away from each other.

[0030] The battery cell 40 is sandwiched between the upper hot plate 21 and the lower hot plate 22. Both the upper hot plate 21 and the lower hot plate 22 are equipped with electric heaters. The upper hot plate 21 and the lower hot plate 22 flatten the battery cell 40 while heating the battery cell 40, thereby promoting the tight bonding between key materials such as positive and negative electrode sheets, separators, and active material coatings.

[0031] The hot pressing mechanism 20 is configured such that when the driving mechanism 30 drives the upper hot pressing plate 21 and the lower hot pressing plate 22 to jointly press the battery cell 40 from the starting point to the end point, the pressure on the central region 41 where the battery cell 40 is located is greater than the pressure on the edge region 42 where the battery cell 40 is located.

[0032] In this embodiment of the battery cell hot pressing device, when the driving mechanism 30 drives the upper hot pressing plate 21 and the lower hot pressing plate 22 to jointly press the battery cell 40 from the starting point to the end point, the pressure of the central region 41 of the battery cell 40 after being pressed by the upper hot pressing plate 21 and the lower hot pressing plate 22 is greater than the pressure of the edge region 42.

[0033] This results in the porosity of the central region 41 of the cell 40 being lower than that of the edge region 42, reducing the migration speed of lithium ions in the edge region 42 of the cell 40, reducing lithium deposition at the negative electrode edge, which helps to improve the battery's capacity retention rate and extend the cell's lifespan.

[0034] The hot-pressing device for the battery cell in this embodiment applies higher pressure to the central region 41 of the battery cell 40 and lower pressure to the edge region 42. The hot-pressing device designs the pressure distribution across different regions of the battery cell 40 using an upper hot-pressing plate 21 and a lower hot-pressing plate 22, which can create tiny gaps in the edge region 42 of the battery cell 40, increasing the resistance to lithium ion migration and reducing the amount of lithium intercalated at the edge of the negative electrode.

[0035] Compared to existing hot-pressing processes in battery cell manufacturing, which typically aim for consistency and uniform pressure distribution at the overall interface between electrodes, this application breaks with this traditional approach by actively applying differentiated pressure (larger pressure at the center and smaller pressure at the edge) to the central region 41 and the edge region 42 of the battery cell 40.

[0036] The cell hot-pressing device uses the cooperation of the upper hot-pressing plate 21 and the lower hot-pressing plate 22 to apply non-uniform and precisely controlled pressure to the cell 40. This suppresses the migration of lithium ions between the normal region and the OH region during charging and discharging, reduces the concentration diffusion effect, and ultimately effectively delays the occurrence of lithium plating during cycling.

[0037] In some alternative embodiments: see Figure 1 and Figure 6As shown in the figure, this application embodiment provides a battery cell hot pressing device. The upper hot pressing plate 21 of the battery cell hot pressing device includes an upper left pressure plate 212, an upper middle pressure plate 211 and an upper right pressure plate 213 arranged in parallel. The upper middle pressure plate 211 is used to press the central region 41 of the battery cell 40, and the upper left pressure plate 212 and the upper right pressure plate 213 are used to press the edge regions 42 at both ends of the battery cell 40, respectively.

[0038] The drive mechanism 30 includes a first pressing mechanism 31, a second pressing mechanism 32, and a third pressing mechanism 33, which are respectively connected to the upper left pressure plate 212, the upper middle pressure plate 211, and the upper right pressure plate 213. When the upper hot pressure plate 21 and the lower hot pressure plate 22 jointly compress the battery cell 40 from the starting point to the ending point, the pressure value of the second pressing mechanism 32 is greater than the pressure values ​​of the first pressing mechanism 31 and the third pressing mechanism 33. The first pressing mechanism 31, the second pressing mechanism 32, and the third pressing mechanism 33 are preferably, but not limited to, hydraulic cylinders, pneumatic cylinders, or electric cylinders.

[0039] In some alternative embodiments: see Figure 2 and Figure 6 As shown in the figure, this application provides a battery cell hot pressing device. The driving mechanism 30 of the battery cell hot pressing device includes a pressing mechanism 34 and a pressure equalizing plate 35 connected to the end of the pressing mechanism 34. The upper left pressure plate 212 and the upper right pressure plate 213 are connected to the two ends of the pressure equalizing plate 35 by elastic members 214. The upper middle pressure plate 211 is fixed in the middle of the pressure equalizing plate 35 and is located between the upper left pressure plate 212 and the upper right pressure plate 213. The pressing mechanism 34 is selected, but not limited to, a hydraulic cylinder, a pneumatic cylinder, or an electric cylinder.

[0040] The elastic element 214 includes a first elastic pad connected between the upper left pressure plate 212 and the pressure equalizing plate 35, and a second elastic pad connected between the upper right pressure plate 213 and the pressure equalizing plate 35; the first elastic pad and the second elastic pad can be rubber pads or tendon pads.

[0041] The bottom surfaces of the upper left pressure plate 212, the upper middle pressure plate 211, and the upper right pressure plate 213 are flush, and the thickness of the upper middle pressure plate 211 is greater than the thickness of the upper left pressure plate 212 and the upper right pressure plate 213. This allows for reserved space between the upper left pressure plate 212 and the upper right pressure plate 213 and the equalizing plate 35 to accommodate the installation of the first elastic pad and the second elastic pad.

[0042] In this embodiment, a first elastic pad is provided between the upper left pressure plate 212 and the equalizing plate 35, and a second elastic pad is provided between the upper right pressure plate 213 and the equalizing plate 35. The upper middle pressure plate 211 is directly fixed to the middle of the equalizing plate 35. When the pressing mechanism 34 synchronously drives the upper left pressure plate 212, the upper middle pressure plate 211, and the upper right pressure plate 213 to press down the battery cell 40, due to the elastic contraction of the first and second elastic pads, the downward pressure applied by the upper left pressure plate 212 and the upper right pressure plate 213 to the edge region 42 is less than the downward pressure applied by the upper middle pressure plate 211 to the center region 41.

[0043] In some alternative embodiments: see Figure 2 and Figure 6 As shown, this application embodiment provides a battery cell hot pressing device. The elastic element 214 of the battery cell hot pressing device includes a first disc spring connected between the upper left pressure plate 212 and the pressure equalizing plate 35, and a second disc spring connected between the upper right pressure plate 213 and the pressure equalizing plate 35.

[0044] Multiple first and second disc springs can be stacked. These multiple first and second disc springs are coaxially positioned by pins, which are slidably connected to the pressure equalizing plate 35. This allows the multiple first and second disc springs to elastically support the upper left pressure plate 212 and the upper right pressure plate 213. The bottom surfaces of the upper left pressure plate 212, the upper middle pressure plate 211, and the upper right pressure plate 213 are flush, with the upper middle pressure plate 211 being thicker than the upper left and upper right pressure plates 212 and 213. This provides space between the upper left and upper right pressure plates 212 and the pressure equalizing plate 35 for installing the first and second disc springs. In this embodiment, multiple stacked first disc springs are provided between the upper left pressure plate 212 and the equalizing plate 35, and multiple stacked second disc springs are provided between the upper right pressure plate 213 and the equalizing plate 35. The upper middle pressure plate 211 is directly fixed to the middle of the equalizing plate 35. When the pressing mechanism 34 synchronously drives the upper left pressure plate 212, the upper middle pressure plate 211, and the upper right pressure plate 213 to press down the battery cell 40, due to the elastic contraction of the first and second disc springs, the downward pressure applied by the upper left pressure plate 212 and the upper right pressure plate 213 to the edge region 42 is less than the downward pressure applied by the upper middle pressure plate 211 to the center region 41.

[0045] In some alternative embodiments: see Figures 3 to 6 As shown in the figure, this application provides a battery cell hot pressing device. The upper hot pressing plate 21 of the battery cell hot pressing device has an upper pressing surface near the bottom surface of the lower hot pressing plate 22. The upper pressing surface includes an upper middle pressing surface 215 for applying pressure to the central region 41 of the battery cell 40, and an upper left pressing surface 216 and an upper right pressing surface 217 located on both sides of the upper middle pressing surface 215 for applying pressure to the edge region 42 of the battery cell 40, respectively. The upper middle pressing surface 215 protrudes from the upper left pressing surface 216 and the upper right pressing surface 217.

[0046] The lower hot plate 22 has a lower pressing surface on its top surface near the upper hot plate 21. The lower pressing surface includes a lower middle pressing surface 221 for applying pressure to the central region 41 of the battery cell 40, and a lower left pressing surface 222 and a lower right pressing surface 223 located on both sides of the lower middle pressing surface 221 for applying pressure to the edge region 42 of the battery cell 40, respectively. The lower middle pressing surface 221 protrudes from the lower left pressing surface 222 and the lower right pressing surface 223.

[0047] The projections of the upper middle pressure surface 215 and the lower middle pressure surface 221 in the height direction coincide, the projections of the upper left pressure surface 216 and the lower left pressure surface 222 in the height direction coincide, and the projections of the upper right pressure surface 217 and the lower right pressure surface 223 in the height direction coincide. The widths of the upper left pressure surface 216 and the lower left pressure surface 222 are both 5-60mm, and the widths of the upper right pressure surface 217 and the lower right pressure surface 223 are both 5-60mm.

[0048] In this embodiment, the upper middle pressure surface 215 of the upper hot press plate 21 protrudes from the upper left pressure surface 216 and the upper right pressure surface 217. The lower middle pressure surface 221 of the lower hot press plate 22 protrudes from the lower left pressure surface 222 and the lower right pressure surface 223, and the lower hot press plate 22 is mirrored with the upper hot press plate 21. Thus, when the lower hot press plate 22 and the upper hot press plate 21 jointly press the battery cell 40, the top and bottom surfaces of the battery cell 40 are subjected to uniform pressure.

[0049] Furthermore, the upper middle pressure surface 215 protrudes from the upper left pressure surface 216 and the upper right pressure surface 217, and the lower middle pressure surface 221 protrudes from the lower left pressure surface 222 and the lower right pressure surface 223. The pressure exerted by the upper middle pressure surface 215 and the lower middle pressure surface 221 on the central region 41 of the cell 40 is greater than the pressure exerted by the upper left pressure surface 216, the upper right pressure surface 217, the lower left pressure surface 222 and the lower right pressure surface 223 on the edge region 42 of the cell 40.

[0050] The widths of the upper left pressure surface 216 and the lower left pressure surface 222 are both 5-60 mm, more preferably 30 mm. The widths of the upper right pressure surface 217 and the lower right pressure surface 223 are both 5-60 mm, more preferably 30 mm. Therefore, the upper left pressure surface 216, the upper right pressure surface 217, the lower left pressure surface 222, and the lower right pressure surface 223 can cover the edge region 42 where lithium plating occurs in the battery cell 40.

[0051] A second aspect of this application provides a battery cell production apparatus, including the battery cell hot pressing device described in any of the above embodiments.

[0052] Working principle This application provides a battery cell hot pressing device and a lithium-ion battery cell. The battery cell hot pressing device of this application is provided with a hot pressing frame 10, on which a hot pressing mechanism 20 is provided. The hot pressing mechanism 20 includes an upper hot pressing plate 21 and a lower hot pressing plate 22 for jointly pressing the battery cell 40, and a driving mechanism 30 for driving the upper hot pressing plate 21 and the lower hot pressing plate 22 to move closer to or further away from each other. The hot pressing mechanism 20 is configured such that when the driving mechanism 30 drives the upper hot pressing plate 21 and the lower hot pressing plate 22 to jointly press the battery cell 40 from the starting point to the ending point, the pressure on the central region 41 where the battery cell 40 is located is greater than the pressure on the edge region 42 where the battery cell 40 is located.

[0053] Therefore, in the hot pressing device of this application, when the driving mechanism 30 drives the upper hot pressing plate 21 and the lower hot pressing plate 22 to jointly press the battery cell 40 from the starting point to the ending point, the pressure on the central region 41 of the battery cell 40 after being pressed by the upper hot pressing plate 21 and the lower hot pressing plate 22 is greater than the pressure on the edge region 42. This results in the porosity of the central region 41 of the battery cell 40 being less than the porosity of the edge region 42, reducing the migration speed of lithium ions in the edge region 42 of the battery cell 40, reducing lithium deposition at the negative electrode edge, helping to improve the battery's capacity retention rate, and extending the service life of the battery cell 40.

[0054] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0055] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0056] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A battery cell hot pressing device, characterized in that, include: A hot press frame (10) is provided with a hot press mechanism (20), the hot press mechanism (20) includes an upper hot press plate (21) and a lower hot press plate (22) for jointly pressing the battery cell (40), and a drive mechanism (30) for driving the upper hot press plate (21) and the lower hot press plate (22) to move closer to or further away from each other. The hot pressing mechanism (20) is configured such that when the driving mechanism (30) drives the upper hot pressing plate (21) and the lower hot pressing plate (22) to jointly squeeze the battery cell (40) from the starting point to the end point, the pressure of the central region (41) where the battery cell (40) is located is greater than the pressure of the edge region (42) where the battery cell (40) is located.

2. The cell hot pressing device as described in claim 1, characterized in that: The upper hot press plate (21) includes an upper left press plate (212), an upper middle press plate (211) and an upper right press plate (213) arranged in parallel. The upper middle press plate (211) is used to press the central region (41) of the battery cell (40), and the upper left press plate (212) and the upper right press plate (213) are used to press the edge regions (42) at both ends of the battery cell (40) respectively.

3. The cell hot pressing device as described in claim 2, characterized in that: The drive mechanism (30) includes a first pressure mechanism (31), a second pressure mechanism (32), and a third pressure mechanism (33) that are respectively connected to the upper left pressure plate (212), the upper middle pressure plate (211), and the upper right pressure plate (213). When the upper hot platen (21) and the lower hot platen (22) jointly squeeze the battery cell (40) from the starting point to the end point, the pressure value of the second pressure mechanism (32) is greater than the pressure values ​​of the first pressure mechanism (31) and the third pressure mechanism (33).

4. The cell hot pressing device as described in claim 2, characterized in that: The driving mechanism (30) includes a pressing mechanism (34) and a pressure equalizing plate (35) connected to the end of the pressing mechanism (34). The upper left pressure plate (212) and the upper right pressure plate (213) are connected to the two ends of the pressure equalizing plate (35) by an elastic member (214). The upper middle pressure plate (211) is fixed in the middle of the pressure equalizing plate (35) and is located between the upper left pressure plate (212) and the upper right pressure plate (213).

5. The cell hot pressing device as described in claim 4, characterized in that: The elastic element (214) includes a first elastic pad connected between the upper left pressure plate (212) and the pressure equalizing plate (35), and a second elastic pad connected between the upper right pressure plate (213) and the pressure equalizing plate (35); The bottom surfaces of the upper left pressure plate (212), upper middle pressure plate (211) and upper right pressure plate (213) are flush, and the thickness of the upper middle pressure plate (211) is greater than the thickness of the upper left pressure plate (212) and upper right pressure plate (213).

6. The cell hot pressing device as described in claim 4, characterized in that: The elastic element (214) includes a first disc spring connected between the upper left pressure plate (212) and the pressure equalizing plate (35), and a second disc spring connected between the upper right pressure plate (213) and the pressure equalizing plate (35); The bottom surfaces of the upper left pressure plate (212), upper middle pressure plate (211) and upper right pressure plate (213) are flush, and the thickness of the upper middle pressure plate (211) is greater than the thickness of the upper left pressure plate (212) and upper right pressure plate (213).

7. The cell hot pressing device as described in claim 1, characterized in that: The upper hot platen (21) has an upper pressure surface near the bottom surface of the lower hot platen (22). The upper pressure surface includes an upper middle pressure surface (215) for applying pressure to the central region (41) of the battery cell (40), and an upper left pressure surface (216) and an upper right pressure surface (217) located on both sides of the upper middle pressure surface (215) for applying pressure to the edge region (42) of the battery cell (40). The upper middle pressure surface (215) protrudes from the upper left pressure surface (216) and the upper right pressure surface (217).

8. The cell hot pressing device as described in claim 7, characterized in that: The lower hot platen (22) has a lower pressure surface near the top surface of the upper hot platen (21). The lower pressure surface includes a lower middle pressure surface (221) for applying pressure to the central region (41) of the battery cell (40), and a lower left pressure surface (222) and a lower right pressure surface (223) located on both sides of the lower middle pressure surface (221) for applying pressure to the edge region (42) of the battery cell (40). The lower middle pressure surface (221) protrudes from the lower left pressure surface (222) and the lower right pressure surface (223).

9. The cell hot pressing device as described in claim 8, characterized in that: The projections of the upper middle pressure surface (215) and the lower middle pressure surface (221) in the height direction coincide with each other; the projections of the upper left pressure surface (216) and the lower left pressure surface (222) in the height direction coincide with each other; and the projections of the upper right pressure surface (217) and the lower right pressure surface (223) in the height direction coincide with each other. The widths of the upper left pressing surface (216) and the lower left pressing surface (222) are both 5-60mm, and the widths of the upper right pressing surface (217) and the lower right pressing surface (223) are both 5-60mm.

10. A battery cell manufacturing equipment, characterized in that, Includes the cell hot pressing device according to any one of claims 1 to 9.

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