Large battery cell shaping device and method

Abstract

The invention discloses a large battery cell shaping device and method.The device is used for conducting hot-pressing shaping on a battery cell through an upper pressing plate, the device comprises the upper pressing plate and a control unit, the upper pressing plate is divided into three parts including a middle pressing plate and edge pressing plates arranged on the two sides of the middle pressing plate, and the control unit is connected with the middle pressing plate; the pressing areas of the edge pressing plates are used for adjusting the shapes of the two sides of the battery cell, the middle pressing plate is attached to the edge pressing plates on the two sides respectively, each part can be pressed downwards independently through the control unit, and the working faces of the middle pressing plate and the edge pressing plates on the two sides are located on the same plane. Each part is independently controlled by the control unit, so that the risk of wrinkles and deformation of the wound battery cell during hot pressing can be effectively reduced, and meanwhile, the problem that the laminated battery cell is slightly soft due to thickness difference can be solved by sticking the elastic pieces on the two edge pressing plates.

Description

Technical Field

[0001] The technical field of the present invention is electrochemical energy storage, and in particular, relates to a large battery cell shaping device and method. Background Art

[0002] Against the backdrop of global economic growth and rapid urbanization, energy demand continues to rise. In order to reduce the impact on the environment, the use of clean energy such as solar energy, wind energy and hydropower is increasing. However, the instability and intermittency of these energy sources have prompted the development of energy storage technology. The field of electrochemical energy storage is showing strong growth potential. Benefiting from policy support and cost reduction, the global energy storage market is expected to grow rapidly.

[0003] The energy storage industry has put forward higher requirements for battery cells, including larger capacity, lower cost and longer service life. In order to improve manufacturing efficiency and increase the energy density of battery cells, the size of battery cells is increasing, and many companies have launched large battery cells with a capacity of more than 320Ah, which helps to reduce the cost of electricity throughout the life cycle of energy storage systems and meet the needs of large-scale and highly economical applications.

[0004] At present, the manufacturing process of energy storage aluminum shell battery cells is mainly divided into two types: one is hot pressing after winding, and the other is hot pressing after stacking. Both of them hot press the battery cells by placing the wound or stacked battery cells on the lower pressure plate, and then the upper pressure plate uses a single-stage hot pressing method to shape the battery cells. The common purpose of both is to ensure that the battery cells are tight and convenient for subsequent assembly and use.

[0005] However, the prior art faces some problems in the hot pressing and shaping process of large battery cells: in the battery cell after winding, as the width of the winding core increases, its two corners (the part where the edge of the battery cell connects to the main plane) are higher, which can easily cause the middle area to collapse or deform. During the hot pressing process, the upper pressure plate first contacts the corners of the battery cell, resulting in inward cohesive force on both sides, which makes the middle area uneven and produces electrode wrinkles; for stacked battery cells, an M6T blade structure with electrode ears at both ends is usually adopted. Since there are no corners, large-surface wrinkles generally will not be generated during hot pressing. However, since the battery cell is relatively long, the thickness of the thinned areas on both sides and the middle area may differ by 0.3-0.5mm, which leads to uneven heat conduction during the hot pressing process, making the shaping effect of the thinned areas on both sides not as good as that of the middle area, resulting in the battery cell being soft on both sides. Summary of the invention

[0006] The object of the present invention is to provide a large battery cell shaping device and method to reduce the possibility of wrinkles and deformation of the battery cell during hot pressing.

[0007] According to a first aspect of the present invention, a large cell shaping device is provided, which is used to perform hot pressing shaping on a cell through an upper pressing plate, and the device comprises an upper pressing plate and a control unit:

[0008] The upper pressing plate is divided into three parts, including a middle pressing plate and edge pressing plates arranged on both sides of the middle pressing plate. The pressing area of ​​the edge pressing plate is used to adjust the shape of both sides of the battery cell, and the middle pressing plate is respectively fitted with the edge pressing plates on both sides. Each part can be pressed down individually by the control unit, and the working surfaces of the middle pressing plate and the edge pressing plates on both sides are in the same plane.

[0009] Furthermore, the device also includes an elastic member, and the elastic member is attached to the working surface of the edge pressing plate of the upper pressing plate.

[0010] Furthermore, the elastic member has a thickness range of 0.3-0.5 mm and an elastic compression rate of 20%-60%, and has a temperature resistance characteristic of maintaining stable performance within a range of 180° C. to 230° C.

[0011] Furthermore, the elastic member is a silicone pad.

[0012] Furthermore, the battery cell includes a wound battery cell and a laminated battery cell.

[0013] Furthermore, the edge pressing plates of the upper pressing plate are symmetrically arranged on both sides of the middle pressing plate.

[0014] Furthermore, the pressure of each of the three parts of the upper pressing plate can be independently controlled by the control unit during the hot pressing process.

[0015] Furthermore, the control unit uses a servo motor or a cylinder to control the pressing sequence and pressure of the three parts of the upper pressing plate.

[0016] According to a second aspect of the present invention, a large cell shaping method is provided, which is used for hot pressing and shaping a wound cell by an upper pressing plate, wherein the upper pressing plate is divided into three parts, including a middle pressing plate and edge pressing plates on both sides, wherein the three parts are closely fitted, and each area can be pressed down separately; the method comprises the following steps:

[0017] The three parts of the upper pressing plate correspond to the middle area and the corner areas on both sides of the battery cell respectively;

[0018] Dropping the middle pressing plate to press the middle area;

[0019] After that, at a predetermined interval, the edge pressing plate is dropped down and pressed against the corner area, so that the working surfaces of the three parts of the upper pressing plate are in the same plane;

[0020] The wound battery cell is hot pressed and shaped.

[0021] According to a third aspect of the present invention, a method for shaping a large battery cell is provided, which is used for hot pressing and shaping a laminated battery cell by an upper pressing plate, wherein the upper pressing plate is divided into three parts, including a middle pressing plate and edge pressing plates on both sides, wherein the three parts are closely fitted, and each area can be pressed down separately; the method comprises the following steps:

[0022] The three parts of the upper pressing plate correspond to the middle area and the corner areas on both sides of the battery cell respectively;

[0023] Affix elastic members to the working surfaces of the two edge pressure plates;

[0024] The three parts are dropped simultaneously and pressed against the battery core so that the working surfaces of the three parts are located in the same plane;

[0025] The laminated battery core is subjected to hot pressing and shaping.

[0026] Compared with the prior art, the present invention has at least the following technical effects:

[0027] The present invention provides a large cell shaping device, which divides an upper pressing plate into three parts, including a middle pressing plate and edge pressing plates arranged on both sides of the middle pressing plate, and each area can be pressed down separately and the working surfaces of the middle pressing plate and the edge pressing plates on both sides are in the same plane. When the wound cell is ready for hot pressing, the shaping process of the middle area and the corner areas on both sides of the wound cell can be more accurately controlled by dividing the wound cell into three parts for hot pressing, thereby reducing the possibility of wrinkles and deformation of the wound cell during the hot pressing process.

[0028] When the laminated battery cells are ready for hot pressing, elastic parts are attached to the edge plates on both sides of the upper pressing plate for hot pressing shaping. Since the elastic parts can fill the thickness difference between the corner areas on both sides of the laminated battery cells and the middle area in the middle, the overall force on the laminated battery cells during hot pressing is more uniform, reducing the problem of soft laminated battery cells caused by thickness differences.

[0029] Furthermore, the hot pressing shaping method of wound battery cells and stacked battery cells can be quickly switched as needed, that is, the same equipment can adapt to different types of battery cell shaping needs, making the production process more flexible and eliminating the need to purchase and maintain special equipment for different types of battery cells, thereby reducing capital expenditure. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a flow chart of the winding cell shaping method in the first embodiment of the present invention;

[0031] Figure 2 It is a schematic diagram of the structure of a wound battery cell before hot pressing in one embodiment of the present invention;

[0032] Figure 3 It is a schematic diagram of the structure in which the middle area of ​​the upper pressing plate is pressed downward during hot pressing of the wound battery cell in one embodiment of the present invention;

[0033] Figure 4 It is a structural schematic diagram of the upper pressing plate being fully pressed downward during hot pressing of the wound battery cell in one embodiment of the present invention;

[0034] Figure 5 This is a flow chart of the stacked cell shaping method in Embodiment 1 of the present invention;

[0035] Figure 6 It is a schematic diagram of the structure of a laminated battery cell before hot pressing in one embodiment of the present invention;

[0036] Figure 7 Schematic diagram of the structure in which the upper pressing plate is fully pressed downward during hot pressing of the stacked battery cell in one embodiment of the present invention.

[0037] Among them, 1. upper pressure plate; 11. middle pressure plate; 12. edge pressure plate; 2. wound battery cell; 3. laminated battery cell; 4. elastic part; 51. middle area; 52. corner area. DETAILED DESCRIPTION

[0038] A large cell shaping device and method of the present invention will be described in more detail below in conjunction with a schematic diagram, wherein a preferred embodiment of the present invention is shown, and it should be understood that those skilled in the art can modify the present invention described herein while still achieving the beneficial effects of the present invention. Therefore, the following description should be understood as being widely known to those skilled in the art, and not as a limitation of the present invention.

[0039] For the sake of clarity, not all features of the actual embodiments are described. In the following description, well-known functions and structures are not described in detail because they would clutter the invention with unnecessary detail. It should be recognized that in the development of any actual embodiment, a large number of implementation details must be made to achieve the developer's specific goals, such as changing from one embodiment to another according to the limitations of the relevant system or the relevant business. In addition, it should be recognized that such development work may be complex and time-consuming, but it is just a routine task for those skilled in the art.

[0040] The present invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the accompanying drawings are in very simplified form and are not in exact proportions, and are only used to facilitate and clearly assist in illustrating the purpose of the embodiments of the present invention.

[0041] As the global demand for clean energy grows, energy storage technology has become particularly important. As one of the key technologies, electrochemical energy storage, one of its core components, the battery cell, especially the large-capacity battery cell, is crucial to improving the performance of the energy storage system. However, there are some challenges in the existing technology when manufacturing large battery cells. For example, wound battery cells are prone to wrinkles during the hot pressing process, and stacked battery cells may become soft on both sides after hot pressing. These problems seriously affect the performance and life of the battery cells. Therefore, a new large battery cell shaping method is needed to solve these problems.

[0042] Embodiment 1:

[0043] Please refer to Figure 1-Figure 7 , this embodiment 1 provides a large battery cell shaping device, which is used to perform hot pressing shaping on the battery cell through an upper pressing plate 1, and the device includes an upper pressing plate 1 and a control unit.

[0044] Specifically, the upper pressing plate 1 is an upper hot pressing plate, which is divided into three parts, including an intermediate pressing plate 11 and edge pressing plates 12 arranged on both sides of the intermediate pressing plate 11. The pressing area of ​​the edge pressing plate 12 is used to adjust the shape of both sides of the battery cell, and the intermediate pressing plate 11 is respectively fitted with the edge pressing plates 12 on both sides, and each part can be pressed down separately by the control unit, and the working surfaces of the intermediate pressing plate 11 and the edge pressing plates 12 on both sides are in the same plane.

[0045] It should be noted that the design of the upper pressing plate 1 being divided into three parts enables the upper pressing plate 1 to correspond more accurately to different parts of the battery cell, and this design can improve the adaptability and flexibility of the hot pressing process. Figure 1 As shown, the upper pressing plate 1 is called a "three-stage hot pressing plate". Compared with the traditional single hot pressing plate, the three-stage hot pressing plate can more effectively control the deformation of the battery cell during the hot pressing process. This method can reduce the uneven deformation of the battery cell during the hot pressing process, thereby improving the quality and consistency of the battery cell. And the three areas are physically closely combined to form an integral structure to ensure that the battery cell can be evenly acted on during the hot pressing process.

[0046] Furthermore, during the hot pressing process, the control unit can independently control each part of the upper pressing plate 1 , and can control the pressing sequence and pressure of each part of the upper pressing plate 1 .

[0047] Specifically, Figure 2, the control unit can independently control the middle pressing plate 11, and apply pressure to the middle area 51 of the wound battery cell 2 through the control unit, and can also control the edge pressing plates 12 on both sides to apply corresponding pressure to the corner areas 51 on both sides through the control unit. The control unit is controlled by a servo motor or a cylinder, that is, during the hot pressing process of the three parts of the upper pressing plate 1, the servo motor and the cylinder can independently control the pressing sequence and pressure of the three parts of the upper pressing plate 1 to meet the shaping requirements of different parts of the battery cell. In addition, through the servo motor or the cylinder, the pressure applied to the battery cell can be monitored and accurately controlled in real time to ensure that the battery cell is subjected to uniform and appropriate pressure during the hot pressing process, thereby avoiding deformation or damage of the battery cell due to uneven pressure.

[0048] In addition, the two edge pressing plates 12 of the upper pressing plate 1 are symmetrically arranged, and they are respectively located on both sides of the middle pressing plate 11. This symmetrical layout helps to ensure that the battery cells are subjected to uniform force during the hot pressing and shaping process.

[0049] Further, such as Figure 6 and Figure 7 As shown, the device also includes an elastic member 4. When hot pressing the laminated battery core 3, the elastic member 4 needs to be attached to the working surface of the edge pressing plate 12 on both sides of the upper pressing plate 1. The elastic member 4 can be a silicone pad with a thickness range of 0.3-0.5mm and an elastic compression rate of 20%-60%. By using the elastic member 4, the shaping effect of both sides of the laminated battery core 3 during the hot pressing process can be improved, which helps to eliminate the problem of softness after hot pressing caused by the uneven thickness of the laminated battery core 3. In addition, the elastic member 4 has a temperature resistance characteristic of maintaining stable performance in the range of 180℃ to 230℃, which means that it can remain stable in a high temperature environment during the hot pressing shaping process and will not be deformed or damaged due to high temperature, thereby ensuring the continuity of the hot pressing shaping process and the quality of the battery core.

[0050] It should be noted that, when using the device, it is first necessary to determine the type of battery cell, and then select a corresponding shaping method according to the type of battery cell. In this embodiment, the types of battery cells include wound battery cells and laminated battery cells.

[0051] Specifically, for the wound battery cell 2, hot pressing shaping may be performed by referring to the method of the following embodiment 2; for the laminated battery cell 3, hot pressing shaping may be performed by referring to the method of the following embodiment 3 based on the same equipment.

[0052] The shaping device allows the shaping method of the wound battery cell 2 to be quickly switched to the shaping method of the laminated battery cell 3 by attaching elastic members 4 with a specific thickness and elastic compression rate to the edge pressing plates 12 on both sides of the upper pressing plate 1 without changing the equipment or making complicated adjustments, thereby improving production efficiency and output. In addition, the operator can flexibly select the shaping method that best suits the current battery cell type according to actual production needs.

[0053] Embodiment 2:

[0054] Please refer to Figure 1-Figure 4 The second embodiment provides a method for shaping a large battery cell, which is used to hot-press and shape a wound battery cell 2 through an upper pressing plate 1. The upper pressing plate 1 is divided into three parts, including a middle pressing plate 11 and edge pressing plates 12 on both sides. The three parts are tightly fitted, and each area can be pressed down separately.

[0055] Specifically, Figure 1 As shown, the method comprises the following steps:

[0056] Step S11, the three parts of the upper pressing plate 1 correspond to the middle area 51 and the corner areas 52 on both sides of the wound battery core 2 respectively;

[0057] Step S12, dropping the middle pressing plate 11 to press the middle area 51;

[0058] Step S13, after a predetermined time interval, the edge pressing plate 12 is dropped and pressed against the corner area 52, so that the working surfaces of the three parts of the upper pressing plate are in the same plane;

[0059] Step S14, hot pressing and shaping the wound battery cell 2.

[0060] In the method of the second embodiment, a three-stage hot pressing plate design is adopted for the hot pressing shaping process of the wound battery cell 2. The core of this design is to divide the traditional single hot pressing plate into three independent control areas so as to more accurately apply appropriate pressure to different parts of the wound battery cell 2. The following are the detailed steps of hot pressing shaping of the wound battery cell 2:

[0061] In step S11, Figure 2 As shown, the upper pressing plate 1 includes three parts: a middle pressing plate 11 and edge pressing plates 12 on both sides. These three areas are physically closely combined to ensure that they can work together during the hot pressing process while maintaining their independence for precise control. Before the hot pressing operation, the wound battery cell 2 is accurately placed under the upper pressing plate 1, ensuring that the middle pressing plate 11 and the edge pressing plates 12 on both sides of the upper pressing plate 1 are aligned with the middle area 51 and the corner areas 52 on both sides of the corresponding wound battery cell 2.

[0062] Step S12 includes: hot pressing of the middle region 51:

[0063] First, if Figure 3 As shown, the middle pressing plate 11 is dropped by adjusting the control device, and pressure is applied to the middle area 51 of the wound battery cell 2. The purpose is to ensure that the middle area 51 of the wound battery cell 2 is compacted first, thereby establishing a stable foundation for the subsequent steps.

[0064] Step S13 includes: hot pressing of the corner area 52:

[0065] like Figure 4 As shown, 1-3s after the middle pressing plate 11 falls, the edge pressing plate 12 falls, and at the same time, pressure is applied to the corner areas 52 on both sides of the wound battery core 2, so that the working surfaces of the three parts of the upper pressing plate 1 are in the same plane.

[0066] In step S14, this embodiment implements precise pressure control, including:

[0067] The control device monitors and adjusts the pressure of each area in real time to ensure that the wound battery cell 2 is subjected to uniform and appropriate pressure during the hot pressing process. By real-time monitoring and adjusting the pressure, it can be ensured that the wound battery cell 2 will not produce wrinkles or other defects due to uneven pressure during the hot pressing process, and the volume energy density and overall quality of the wound battery cell 2 can also be improved.

[0068] Therefore, for the wound battery cell 2, the present invention divides the traditional single hot pressing plate into three parts, first presses the middle area 51 of the wound battery cell 2 by the middle pressing plate 11, and then drops the edge pressing plates 12 on both sides and presses the corner areas 52 on both sides, which effectively solves the problem of wrinkles and deformation in the middle area 51 of the wound battery cell 2 due to cohesive force during the hot pressing process. Among them, the method of hot pressing in different areas can shorten the shaping time of the wound battery cell 2, improve production efficiency, and reduce production costs. In addition, by accurately controlling the pressure of each part of the upper pressing plate 1 during the hot pressing process, the shaping quality of the wound battery cell 2 can be significantly improved and the scrap rate can be reduced.

[0069] Embodiment three:

[0070] Please refer to Figure 5-Figure 7 The third embodiment provides a method for shaping a large battery cell, which is used for hot pressing and shaping a laminated battery cell 3 by an upper pressing plate 1, characterized in that the upper pressing plate 1 is divided into three parts, including a middle pressing plate 11 and edge pressing plates 12 on both sides, the three parts are tightly fitted, and each area can be pressed down separately; the method comprises the following steps:

[0071] Step S21, the three parts of the upper pressing plate 1 correspond to the middle area 51 and the corner areas 52 on both sides of the laminated battery core 3 respectively;

[0072] Step S22, attaching the elastic member 4 to the working surfaces of the two edge pressing plates 12;

[0073] Step S23, dropping the three parts simultaneously and pressing the laminated battery core 3, so that the working surfaces of the three parts are located in the same plane;

[0074] Step S24, hot pressing and shaping the laminated battery core 3.

[0075] Specifically, the three parts of the upper pressing plate 1 can independently control the pressure of each part during the hot pressing process, and a servo motor or cylinder is used to control the pressing sequence and pressure of the three parts of the upper pressing plate 1 to meet the shaping requirements of different parts of the laminated battery cell.

[0076] In the method of the third embodiment, for the hot pressing shaping process of the laminated battery core 3, the hot pressing shaping device adopts a three-stage hot pressing plate design and is used in conjunction with the elastic member 4 to optimize the shaping effect of the laminated battery core 3. The detailed steps and advantages of this process are as follows:

[0077] Step S21 includes: area division of the upper pressing plate 1:

[0078] like Figure 6 As shown, the upper pressing plate 1 includes three areas: a middle pressing plate 11 and edge pressing plates 12 on both sides.

[0079] The three areas are physically integrated to ensure they work together during the heat pressing process, while maintaining their independence for precise control.

[0080] Step S22 includes: preparation and installation of the elastic member 4:

[0081] Before hot pressing, select an appropriate elastic member 4, such as a silicone pad, which has a specific thickness (between 0.3-0.5 mm) and elastic compression rate (between 20%-60%). The elastic member 4 needs to have high temperature resistance (180-230° C.) to adapt to the temperature conditions during hot pressing.

[0082] like Figure 6 As shown, elastic members 4, such as silicone pads, are attached to the working surfaces of the edge pressing plates 12 on both sides of the upper pressing plate 1. The installation of the elastic members 4 can ensure that the corner areas 52 on both sides of the laminated core 3 can obtain additional support and protection during the hot pressing process.

[0083] Step S23 includes: hot pressing process:

[0084] At the beginning of hot pressing, Figure 7As shown, the upper pressing plates 1 of the three regions are dropped simultaneously by adjusting the control device to perform hot pressing shaping on the laminated battery core 3. The middle region 51 in the middle of the laminated battery core 3 and the corner regions 52 on both sides are simultaneously subjected to pressure, so that the working surfaces of the three parts are located in the same plane, thereby ensuring that the overall shape and structure of the laminated battery core 3 are evenly adjusted during the hot pressing process.

[0085] Step S24 includes: uniform distribution of pressure:

[0086] The presence of the elastic member 4 enables the pressure to be more evenly distributed in the corner regions 52 on both sides of the laminated battery core 3 , thereby reducing the problem of the laminated battery core 3 being too soft due to uneven pressure.

[0087] Therefore, for the laminated battery cell 3, the present invention divides the traditional single hot pressing plate into three independent control areas, and then attaches elastic parts 4 to the edge pressing plates 12 on both sides of the upper pressing plate 1 before hot pressing shaping. Then, during the hot pressing process, the upper pressing plates 1 in the three areas fall down at the same time, and the elastic parts 4 can be deformed according to the thickness of the corner areas 52 on both sides of the laminated battery cell 3 to ensure that the two sides of the laminated battery cell 3 are tightly combined, eliminating the problem of the laminated battery cell 3 being soft after hot pressing due to the thickness difference in the corner area 52. The design of the three-stage hot pressing plate and the use of elastic parts can shorten the hot pressing time and improve production efficiency.

[0088] In summary, a large cell shaping device is provided in an embodiment of the present invention, which divides the upper pressing plate into three parts, including a middle pressing plate and edge pressing plates on both sides, and each area can be pressed down separately. When the wound cell 2 is ready for hot pressing, the shaping process of the middle area 51 and the corner areas 52 on both sides of the wound cell 2 can be more accurately controlled through this partitioned hot pressing method, thereby reducing the possibility of wrinkles and deformation of the wound cell 2 during the hot pressing process; when the laminated cell 3 is ready for hot pressing, the elastic member 4 is attached to the edge pressing plates 12 on both sides of the upper pressing plate 1 for hot pressing shaping. Since the elastic member 4 can fill the thickness difference between the corner areas 52 on both sides of the laminated cell 3 and the middle area 51 in the middle, it is ensured that the overall force of the laminated cell 3 is more uniform during the hot pressing process, thereby reducing the problem of the laminated cell 3 being soft due to the thickness difference.

[0089] Furthermore, the hot pressing shaping methods of the wound battery cell 2 and the stacked battery cell 3 can be quickly switched as needed, that is, the same equipment can adapt to different types of battery cell shaping requirements, making the production process more flexible and eliminating the need to purchase and maintain special equipment for different types of battery cells, thereby reducing capital expenditure.

[0090] The above is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any technician in the relevant technical field, without departing from the scope of the technical solution of the present invention, makes any form of equivalent replacement or modification to the technical solution and technical content disclosed in the present invention, which does not depart from the content of the technical solution of the present invention and still falls within the protection scope of the present invention.

Claims

1. A large cell shaping device, used for hot pressing and shaping the cell through an upper pressing plate, characterized in that: The device comprises an upper pressing plate and a control unit: The upper pressing plate is divided into three parts, including a middle pressing plate and edge pressing plates arranged on both sides of the middle pressing plate. The pressing area of ​​the edge pressing plate is used to adjust the shape of both sides of the battery cell, and the middle pressing plate is respectively fitted with the edge pressing plates on both sides. Each part can be pressed down individually by the control unit, and the working surfaces of the middle pressing plate and the edge pressing plates on both sides are in the same plane.

2. The device for shaping large cells according to claim 1, characterized in that: The device also includes an elastic member, which is attached to the working surface of the edge pressing plate of the upper pressing plate.

3. The device for shaping large cells according to claim 2, characterized in that: The elastic member has a thickness range of 0.3-0.5 mm and an elastic compression rate of 20%-60%, and has a temperature resistance characteristic of maintaining stable performance within a range of 180° C. to 230° C.

4. The device for shaping large cells according to claim 2, characterized in that: The elastic member is a silicone pad.

5. The device for shaping large battery cells according to claim 1, characterized in that: The battery core includes a wound battery core and a laminated battery core.

6. The device for shaping large cells according to claim 1, characterized in that: The edge pressing plates of the upper pressing plate are symmetrically arranged on both sides of the middle pressing plate.

7. The device for shaping large battery cells according to claim 1, characterized in that: The pressure of each of the three parts of the upper pressing plate can be independently controlled by the control unit during the hot pressing process.

8. The device for shaping large battery cells according to claim 1, characterized in that: The control unit uses a servo motor or a cylinder to control the pressing sequence and pressure of the three parts of the upper pressing plate.

9. A large cell shaping method for hot pressing and shaping a wound cell by an upper pressing plate, characterized in that: The upper pressing plate is divided into three parts, including a middle pressing plate and edge pressing plates on both sides, the three parts are tightly fitted, and each area can be pressed down independently; the method comprises the following steps: The three parts of the upper pressing plate correspond to the middle area and the corner areas on both sides of the battery cell respectively; Dropping the middle pressing plate to press the middle area; After that, at a predetermined interval, the edge pressing plate is dropped down and pressed against the corner area, so that the working surfaces of the three parts of the upper pressing plate are in the same plane; The wound battery cell is hot pressed and shaped.

10. A large cell shaping method for hot pressing and shaping a laminated cell by an upper pressing plate, characterized in that: The upper pressing plate is divided into three parts, including a middle pressing plate and edge pressing plates on both sides, the three parts are tightly fitted, and each area can be pressed down independently; the method comprises the following steps: The three parts of the upper pressing plate correspond to the middle area and the corner areas on both sides of the battery cell respectively; Affix elastic members to the working surfaces of the two edge pressure plates; The three parts are dropped simultaneously and pressed against the battery core so that the working surfaces of the three parts are located in the same plane; The laminated battery core is subjected to hot pressing and shaping.

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