Hot-pressing device

Abstract

The utility model discloses hot pressing device, include: the first pressing plate and the second pressing plate of opposite setting, and the first pressing plate and / or second pressing plate are connected with the first drive arrangement, under the action of first drive arrangement, the first pressing plate and the second pressing plate are close to each other to the preset interval, first heating plate and second heating plate are arranged between the first pressing plate and the second pressing plate, with first heating plate and / or second heating plate connection's second drive arrangement, under the action of second drive arrangement, first heating plate and second heating plate can hold the electric core. First heating plate and second heating plate respectively and the two arc -shaped side of the electric core to be hot -pressed are pasted to guarantee the arc -shaped side hot -pressing even and compaction density consistent of electric core to be hot -pressed. Guarantee the arc -shaped side pole piece and diaphragm of electric core to be hot -pressed can closely adhere, reduce the misplacement and wrinkle, reduce the risk of internal micro short circuit of electric core, improve the security and service life of electric core.

Description

Technical Field

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

[0002] In the production of wound battery cells, hot pressing is a crucial step. Hot pressing allows the electrodes and separators inside the cell to adhere better, reducing internal voids and improving the cell's energy density and stability. Currently, the industry has a relatively mature process for hot pressing wound battery cells, typically using hot pressing plates moving towards each other on two opposite sides of the cell to achieve the desired hot pressing effect. However, wound battery cells have two opposite arc-shaped sides in their winding direction. Existing technologies often result in misalignment and wrinkles of the electrodes and separators on the arc-shaped sides of the wound cell during hot pressing. This not only affects the cell's appearance but, more seriously, increases the risk of micro-short circuits inside the cell, reducing its safety and lifespan. Furthermore, traditional hot pressing methods struggle to achieve ideal uniformity in the compaction density on the arc-shaped sides of the wound cell, leading to performance differences between the arc-shaped sides and other parts of the cell during charging and discharging, affecting the overall charge / discharge efficiency and cycle performance of the cell. Summary of the Invention

[0003] To overcome the shortcomings of existing technologies, this utility model provides a hot-pressing device. This device includes a first heating plate and a second heating plate positioned between a first pressure plate and a second pressure plate to clamp the two arc-shaped sides of the battery cell to be hot-pressed. The first and second heating plates are respectively attached to the two arc-shaped sides of the battery cell to ensure uniform hot pressing and consistent compaction density, resulting in more stable performance of the battery cell during charging and discharging, and improved charging and discharging efficiency and cycle performance. It also ensures that the electrodes and separators on the arc-shaped sides of the battery cell can be tightly fitted, reducing misalignment and wrinkles, lowering the risk of internal micro-short circuits, and improving the safety and lifespan of the battery cell.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is: a hot-pressing device for hot-pressing battery cells, comprising: A first pressure plate and a second pressure plate are arranged opposite to each other. The first pressure plate and / or the second pressure plate are connected to a first driving device. Under the action of the first driving device, the first pressure plate and the second pressure plate move closer to each other along a first direction to a preset distance. A first heating plate is disposed between the first pressure plate and the second pressure plate, and the first heating plate has an arc-shaped surface. A second heating plate is disposed between the first pressure plate and the second pressure plate. The second heating plate has an arc-shaped surface, and the arc-shaped surface of the second heating plate is disposed opposite to the arc-shaped surface of the first heating plate. A second driving device is connected to the first heating plate and / or the second heating plate. Under the action of the second driving device, the first heating plate and the second heating plate can clamp the battery cell perpendicular to the first direction.

[0005] The above technical solution involves placing a first heating plate and a second heating plate between the first and second pressure plates to clamp the two arc-shaped sides of the battery cell to be heat-pressed. The first and second heating plates are respectively attached to the two arc-shaped sides of the battery cell to be heat-pressed, ensuring uniform heat pressing and consistent compaction density on the arc-shaped sides. This ensures a tight fit between the electrode and separator on the arc-shaped sides of the battery cell, reducing misalignment and wrinkles, lowering the risk of micro-short circuits within the battery cell, and improving the safety and lifespan of the battery cell.

[0006] Furthermore, the second driving device includes a cylinder, with the first heating plate and the second heating plate each connected to a cylinder. During hot pressing, the two cylinders can independently adjust the pressure of the first heating plate and the second heating plate relative to the battery cell to be hot-pressed, so as to ensure uniform hot pressing on the arc-shaped side of the battery cell.

[0007] Furthermore, a pressure sensor is installed between the cylinder and the first and second heating plates. The sensor monitors the force applied to the battery cell in real time, allowing for real-time adjustment of the cylinder's force to ensure uniform hot pressing on the arc-shaped side of the battery cell.

[0008] Furthermore, the first and second pressure plates have hot-pressing zones, the length of which is greater than or equal to the length of the battery cell to be hot-pressed, and the width of which is equal to the width of the battery cell to be hot-pressed. The width of the battery cell is the distance between the closest points of the first and second heating plates after the battery cell is clamped between them. Through the above scheme, it is ensured that the force of the first and second pressure plates is fully applied to the battery cell to be hot-pressed.

[0009] Furthermore, it also includes: A temperature sensor is disposed within the first heating plate and the second heating plate; Heating elements are distributed within the first heating plate and the second heating plate.

[0010] The heating element adjusts the heating power in real time according to the temperature of the first heating plate and the second heating plate detected by the temperature sensor, so as to make the temperature of each part of the first heating plate and the second heating plate consistent, ensuring that the battery cell to be heated is heated evenly and avoiding local overheating or overcooling.

[0011] Furthermore, at least three heating elements are arranged along the length of the first heating plate, with a gap between each heating element; The second heating plate has at least three heating elements arranged along its length, with a gap between each heating element.

[0012] Furthermore, a temperature sensor is provided between two adjacent heating elements.

[0013] Furthermore, the first heating plate and the cylinder are detachably connected; The second heating plate and the cylinder are detachably connected.

[0014] Different winding schemes result in different curvatures on the curved side of the battery cell. Through the detachable design, the first heating plate and the second heating plate of the corresponding specifications can be replaced for different specifications of battery cells.

[0015] Furthermore, the lengths of the first heating plate and the second heating plate are greater than or equal to the length of the battery cell to be heated, so as to ensure that the entire arc-shaped side of the battery cell to be heated can be completely wrapped by the first heating plate and the second heating plate.

[0016] Furthermore, it also includes a PLC controller, and the first drive device, the second drive device, the pressure sensor, the temperature sensor, and the heating element are respectively connected to the PLC controller.

[0017] Based on the above technical solution, the beneficial effects of this utility model are as follows: The hot pressing device disclosed in this application has a first heating plate and a second heating plate between the first pressure plate and the second pressure plate for clamping the two arc-shaped sides of the battery cell to be hot-pressed. The first heating plate and the second heating plate are respectively attached to the two arc-shaped sides of the battery cell to be hot-pressed, so as to hot-press the arc-shaped sides of the battery cell, ensuring that the electrode and the diaphragm on the arc-shaped sides of the battery cell can be tightly attached, reducing misalignment and wrinkles, reducing the risk of micro-short circuit inside the battery cell, and improving the safety and service life of the battery cell.

[0018] The first and second heating plates are controlled by independent cylinders, and the force exerted by the first and second heating plates on the battery cell to be heated is monitored in real time by pressure sensors. This ensures that the arc side of the battery cell is heated evenly and the compaction density is consistent, making the battery cell more stable in the charging and discharging process and improving the charging and discharging efficiency and cycle performance of the battery cell.

[0019] To make the above and other objects, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the overall structure of the hot pressing device in an embodiment of this utility model; Figure 2 This is a schematic diagram of the structure of the first pressure plate in an embodiment of this utility model; Figure 3 This is a schematic diagram of the structure of the first heating plate and the second heating plate in an embodiment of this utility model.

[0022] The reference numerals in the above figures are as follows: 1. First pressure plate; 2. Second pressure plate; 3. Battery cell; 4. First heating plate; 5. Second heating plate; 6. Pressure sensor; 7. Second cylinder. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] It should be noted that in the description of this utility model, the terms "first," "second," etc., are used only for descriptive purposes and to distinguish similar objects; there is no order between them, nor should they be construed as indicating or implying relative importance. Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0025] Example: This example discloses a hot pressing device for hot pressing a battery cell. After the battery cell is wound into shape, it has two opposing arc-shaped sides in its winding direction. The hot pressing device includes: A first pressure plate 1 and a second pressure plate 2 are arranged vertically opposite each other. Each pressure plate 1 and pressure plate 2 is connected to a first cylinder, allowing the pressure plates 1 and 2 to move towards or away from each other under the action of the first cylinder. Figure 2As shown, the first pressure plate 1 and the second pressure plate 2 are configured in an I-shape, with the middle portion of the I-shape being a hot-pressing zone 12. The length of the hot-pressing zone 12 is equal to the length of the battery cell 3 to be hot-pressed, and the width of the hot-pressing zone 12 is equal to the width of the battery cell 3 to be hot-pressed. It can be understood that heating resistors are provided within the first pressure plate 1 and the second pressure plate 2 to heat the first pressure plate 1 and the second pressure plate 2, thereby providing the temperature required for hot pressing.

[0026] A first heating plate 4 and a second heating plate 5 are disposed between the first pressure plate 1 and the second pressure plate 2, such as... Figure 3 As shown, the first heating plate 4 and the second heating plate 5 are arranged opposite each other in the horizontal direction, and the opposite side of the first heating plate 4 and the second heating plate 5 is an arc-shaped surface. The length of the first heating plate 4 and the second heating plate 5 is greater than or equal to the length of the battery cell 3 to be heated, so as to ensure that the arc-shaped side of the entire battery cell 3 to be heated can be completely wrapped by the first heating plate 4 and the second heating plate 5.

[0027] A first connecting plate 41 is provided on the side of the first heating plate 4 away from the second heating plate 5. A pressure sensor 6 is connected to the side of the first connecting plate 41 away from the first heating plate 4. The side of the pressure sensor 6 away from the first heating plate 4 is connected to the drive rod of the second cylinder 7.

[0028] A second connecting plate 51 is provided on the side of the second heating plate 5 opposite to the first heating plate 4. A pressure sensor 6 is connected to the side of the second connecting plate 51 opposite to the second heating plate 5. The side of the pressure sensor 6 opposite to the second heating plate 5 is connected to the drive rod of the second cylinder 7. Under the action of the two second cylinders 7, the first heating plate 4 and the second heating plate 5 can be clamped on the two arc-shaped sides of the battery cell 3 to be heated, respectively.

[0029] The arc-shaped portions of the first heating plate 4 and the second heating plate 5 need to be adapted to the arc-shaped side of the battery cell 3 to be hot-pressed, so as to ensure that the first heating plate 4 and the second heating plate 5 are completely in contact with the arc-shaped side of the battery cell 3. However, the arc curvature of the arc-shaped side of the battery cell 3 obtained under different winding schemes is different. Therefore, in this application, the first connecting plate 41 and the second connecting plate 51 are detachably connected to the pressure sensor 6, and the corresponding first heating plate 4 and the second heating plate 5 can be replaced according to the needs of different battery cells 3.

[0030] Through the above scheme, during hot pressing, the pressure sensor 6 monitors in real time the magnitude of the force exerted by the first heating plate 4 and the second heating plate 5 on the arc-shaped side of the battery cell 3 to be hot-pressed, thereby adjusting the force of the two second cylinders 7 in real time so that the two arc-shaped sides of the battery cell 3 to be hot-pressed are subjected to the same force, so as to ensure that the arc-shaped side of the battery cell 3 to be hot-pressed is uniformly hot-pressed and the compaction density is consistent, making the performance of the battery cell more stable during charging and discharging, and improving the charging and discharging efficiency and cycle performance of the battery cell.

[0031] It should be noted that the width of the battery cell 3 to be hot-pressed is the distance between the closest points of the first heating plate 4 and the second heating plate 5 after the battery cell 3 is clamped by the first heating plate 4 and the second heating plate 5. Through the above scheme, the first pressure plate 1 and the second pressure plate 2 can be avoided from being obstructed by the first heating plate 4 or the second heating plate 5 when hot-pressing the battery cell 3, so as to ensure that the force of the first pressure plate 1 and the second pressure plate 2 is fully applied to the battery cell 3 to be hot-pressed.

[0032] The first heating plate 4 has three heating resistors evenly spaced along its length, with a temperature sensor positioned between every two heating resistors. The second heating plate 5 also has three heating resistors evenly spaced along its length, with a temperature sensor positioned between every two heating resistors. The temperature sensors monitor the temperatures of the first heating plate 4 and the second heating plate 5 in real time. Based on the temperature detected by the temperature sensors, the heating power of the heating resistors is adjusted in real time to ensure that the temperatures of all parts of the first heating plate 4 and the second heating plate 5 are consistent, thereby ensuring uniform heating of the piezoelectric cell 3 and avoiding localized overheating or undercooling.

[0033] Optionally, the heating resistor can be replaced with a heating cable or other common heating elements.

[0034] In some embodiments, there are multiple first heating plates 4, which are arranged side by side along their length. Correspondingly, there are multiple second heating plates 5, which are also arranged side by side along their length. Each first heating plate 4 and each second heating plate 5 is provided with a pressure sensor 6.

[0035] The first cylinder, the second cylinder 7, the temperature sensor, the heating resistor, and the pressure sensor 6 are all connected to the PLC controller, which realizes the automatic hot pressing process of the battery cell 3.

[0036] The steps of hot-pressing the battery cell 3 using the above-mentioned hot-pressing device are as follows: The battery cell 3 to be heated is placed in a preset position, and the second cylinder 7 drives the first heating plate 4 and the second heating plate 5 to move toward the battery cell 3 to be heated, so that the arc-shaped surface of the first heating plate 4 and the arc-shaped surface of the second heating plate 5 respectively clamp the two arc-shaped sides of the battery cell 3 to be heated. The first cylinder drives the first pressure plate 1 and the second pressure plate 2 to approach and apply pressure to the hot-pressed battery cell 3, and the heating resistor works to raise the temperature. The pressure sensor 6 detects the force on the two arc sides of the battery cell 3 to be heated in real time. The PLC controller adjusts the force of the second cylinder 7 in real time according to the force on the two arc sides of the battery cell 3 to be heated, so as to ensure that the force of the first heating plate 4 and the second heating plate 5 on the two arc sides of the battery cell 3 to be heated is maintained at the preset value. Temperature sensors monitor the temperature of the two arc-shaped sides of the battery cell 3 to be hot-pressed in real time. The PLC controller adjusts the heating power of the heating resistor in real time according to the temperature of the two arc-shaped sides of the battery cell 3 to be hot-pressed, so as to ensure that the two arc-shaped sides of the battery cell 3 are heated evenly during the hot-pressing process and avoid local overheating or overcooling.

[0037] It should be noted that during the hot pressing process, if the position of the battery cell 3 deviates from the hot pressing area 12 of the first pressure plate 1 and the second pressure plate 2, the force of the first cylinder can be adjusted to reduce the pressure between the first pressure plate 1 and the second pressure plate 2, and the battery cell 3 can be centered by the two second cylinders 7.

[0038] This utility model uses specific embodiments to illustrate the principle and implementation of the utility model. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​the utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​the utility model. Therefore, the content of this specification should not be construed as a limitation of the utility model.

Claims

1. A hot-pressing device for hot-pressing battery cells, characterized in that, include: A first pressure plate and a second pressure plate are arranged opposite to each other. The first pressure plate and / or the second pressure plate are connected to a first driving device. Under the action of the first driving device, the first pressure plate and the second pressure plate move closer to each other along a first direction to a preset distance. A first heating plate is disposed between the first pressure plate and the second pressure plate, and the first heating plate has an arc-shaped surface. A second heating plate is disposed between the first pressure plate and the second pressure plate. The second heating plate has an arc-shaped surface, and the arc-shaped surface of the second heating plate is disposed opposite to the arc-shaped surface of the first heating plate. A second driving device is connected to the first heating plate and / or the second heating plate. Under the action of the second driving device, the first heating plate and the second heating plate can clamp the battery cell perpendicular to the first direction.

2. The hot pressing device as described in claim 1, characterized in that, The second driving device includes a cylinder, and the first heating plate and the second heating plate are respectively connected to a cylinder.

3. The hot pressing device as described in claim 2, characterized in that, A pressure sensor is provided between the cylinder and the first heating plate and the second heating plate.

4. The hot pressing device as described in claim 1, characterized in that, The first pressure plate and the second pressure plate have hot pressing areas, the length of which is greater than or equal to the length of the battery cell to be hot pressed, and the width of which is equal to the width of the battery cell to be hot pressed.

5. The hot pressing device as described in claim 3, characterized in that, Also includes: A temperature sensor is disposed within the first heating plate and the second heating plate; Heating elements are distributed within the first heating plate and the second heating plate.

6. The hot pressing device as described in claim 5, characterized in that, At least three heating elements are arranged along the length of the first heating plate, with a gap between each heating element; The second heating plate has at least three heating elements arranged along its length, with a gap between each heating element.

7. The hot pressing apparatus as described in claim 6, characterized in that, The temperature sensor is disposed between two adjacent heating elements.

8. The hot pressing device as described in claim 3, characterized in that, The first heating plate and the cylinder are detachably connected, and the second heating plate and the cylinder are detachably connected.

9. The hot pressing device as described in claim 1, characterized in that, The lengths of the first heating plate and the second heating plate are greater than or equal to the length of the battery cell to be heat-pressed.

10. The hot pressing apparatus as described in claim 5, characterized in that, It also includes a PLC controller, and the first drive device, the second drive device, the pressure sensor, the temperature sensor, and the heating element are respectively connected to the PLC controller.

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