Hot pressing device

Abstract

The utility model provides a hot pressing device, and relates to the technical field of battery cell processing. The hot-pressing device comprises a support, a driving mechanism, a first hot-pressing plate, a second hot-pressing plate, a flexible part and a separator, the driving mechanism and the second hot-pressing plate are arranged on the support, the second hot-pressing plate is used for bearing a battery cell, and the driving mechanism is connected with the first hot-pressing plate to drive the first hot-pressing plate to move towards or away from the second hot-pressing plate; the isolation piece is arranged on the first hot pressing plate, the flexible piece is located between the isolation piece and the first hot pressing plate, and the isolation piece presses the flexible piece on the surface, facing the second hot pressing plate, of the first hot pressing plate so that the flexible piece can be attached to the first hot pressing plate, the battery cell can be fully compacted, and then model selection waste is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery cell processing, in particular to a hot pressing device. BACKGROUND

[0002] In the method for manufacturing a laminated lithium battery, in order to fully utilize the internal space of the battery, improve the energy density of the battery cell, improve the performance of the battery cell, prevent the battery cell from deforming or being damaged during use, and improve the safety of the battery, the battery cell after lamination needs to be subjected to compaction treatment on a hot pressing table. However, due to the influence of the previous process, the thickness of the pole piece changes slightly, and after lamination, the thickness of the battery cell changes greatly, and the battery cell has uneven thickness, which causes the battery cell to be unable to be fully compacted when the battery cell is subjected to hot pressing.

[0003] At present, the pressure of hot pressing is mainly increased to fully compact the battery cell. However, the pressure required to fully compact the battery cell is far beyond the actual requirement of the battery cell, and therefore a large amount of selection waste is generated. CONTENT OF THE UTILITY MODEL

[0004] The purpose of the present application includes, for example, providing a hot pressing device which can fully compact the battery cell and thereby reduce selection waste.

[0005] Embodiments of the present application can be implemented as follows:

[0006] The embodiments of the present application provide a hot pressing device, which comprises a support, a driving mechanism, a first hot pressing plate, a second hot pressing plate, a flexible piece and a spacer. The driving mechanism and the second hot pressing plate are arranged on the support, the second hot pressing plate is used for bearing the battery cell, and the driving mechanism is connected with the first hot pressing plate to drive the first hot pressing plate to move towards or away from the second hot pressing plate.

[0007] The spacer is arranged on the first hot pressing plate, and the flexible piece is located between the spacer and the first hot pressing plate. The spacer holds the flexible piece on the surface of the first hot pressing plate towards the second hot pressing plate, so that the flexible piece is attached to the first hot pressing plate.

[0008] Optionally, one side of the first hot pressing plate is provided with a mounting plate, the spacer comprises a spacer part and a tensioning part, one end of the spacer part is connected with the first hot pressing plate, the other end of the spacer part is connected with one end of the tensioning part, and the other end of the tensioning part is connected with the mounting plate.

[0009] Optionally, the spacer part covers the flexible piece, and the spacer part is made of a thin material which can directly contact the battery cell.

[0010] Optionally, the isolation part is made of Teflon material.

[0011] Optionally, the tension part is a spring, one end of the spring is connected with the isolation part, and the other end of the spring is connected with the mounting plate.

[0012] Optionally, a hook is arranged on the mounting plate, and the end of the spring away from the isolation part is hung on the hook.

[0013] Optionally, the number of the springs is multiple, and the multiple springs are uniformly arranged along the direction perpendicular to the connecting line of the first hot pressing plate and the second hot pressing plate, and each spring is connected between the isolation part and the mounting plate.

[0014] Optionally, the flexible part is plate-shaped, and the elastic modulus of the flexible part is 1.5-3.3 MPa.

[0015] Optionally, the flexible part is a silica gel pad or a silica gel foam.

[0016] Optionally, the thickness of the flexible part is 1-2 mm.

[0017] The hot pressing device provided by the embodiments has the beneficial effects, for example, in order to fully compact the battery cell and reduce the selection waste, a hot pressing device is designed, which comprises a support, a driving mechanism, a first hot pressing plate, a second hot pressing plate, a flexible part and an isolation part, the driving mechanism and the second hot pressing plate are arranged on the support, the second hot pressing plate is used for bearing the battery cell, the driving mechanism is connected with the first hot pressing plate to drive the first hot pressing plate to move towards or away from the second hot pressing plate; the isolation part is arranged on the first hot pressing plate, the flexible part is located between the isolation part and the first hot pressing plate, and the isolation part holds the flexible part on the surface of the first hot pressing plate towards the second hot pressing plate, so that the flexible part is attached to the first hot pressing plate. In the process of hot pressing the battery cell, first, the battery cell is placed on the second hot pressing plate, and then the driving mechanism is used to drive the first hot pressing plate to move towards the second hot pressing plate until the isolation part contacts the battery cell, at this time, the first hot pressing plate is continuously driven to move towards the second hot pressing plate to hot press the battery cell, and in this process, for the battery cell with uneven thickness, the flexible part can adaptively deform, so that the flexible part can be held on the surface of the entire battery cell, thereby compacting each part of the battery cell and reducing the selection waste. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor.

[0019] Figure 1 It is a structural schematic diagram of the hot-pressing device in the embodiment of the present application.

[0020] Icon: 1-first hot-pressing plate; 11-mounting plate; 2-second hot-pressing plate; 3-flexible member; 4-isolating member; 41-isolating part; 42-tensioning part; 5-battery cell. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present application.

[0023] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0024] In the description of the present application, it should be noted that if the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the present application.

[0025] In addition, if the terms "first", "second" and the like appear, they are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0026] It should be noted that the features in the embodiments of the present application can be combined with each other without conflict.

[0027] The inventor of the present application finds that due to the influence of the process before compaction, the thickness of the pole piece changes slightly, and the pole piece forms a battery cell after being laminated, but at this time the thickness of the battery cell changes greatly, so that the battery cell has uneven thickness, which causes the battery cell to be unable to be fully compacted during hot pressing, and at present, the pressure of hot pressing is mainly increased to fully compact the battery cell, but the pressure that can fully compact the battery cell is far beyond the actual required pressure of the battery cell, so a great selection waste is caused. The embodiments of the present application provide a hot pressing device at least for solving the above technical problems.

[0028] Please refer to Figure 1 The hot pressing device provided by the embodiments of the present application comprises a support, a driving mechanism (not shown in the figure), a first hot pressing plate 1, a second hot pressing plate 2, a flexible piece 3 and a separation piece 4. The driving mechanism and the second hot pressing plate 2 are both arranged on the support, the second hot pressing plate 2 is used for bearing a battery cell 5, the driving mechanism is connected with the first hot pressing plate 1 to drive the first hot pressing plate 1 to move towards or away from the second hot pressing plate 2; the separation piece 4 is arranged on the first hot pressing plate 1, the flexible piece 3 is located between the separation piece 4 and the first hot pressing plate 1, and the separation piece 4 holds the flexible piece 3 on the surface of the first hot pressing plate 1 towards the second hot pressing plate 2, so that the flexible piece 3 is attached to the first hot pressing plate 1.

[0029] It should be noted that the first hot pressing plate 1 is located directly above the second hot pressing plate 2, the second hot pressing plate 2 is fixed on the support, and the driving mechanism can be a driving piece such as an oil cylinder, as long as it can drive the first hot pressing plate 1 to move towards or away from the second hot pressing plate 2; the separation piece 4 holds the flexible piece 3 on the surface of the first hot pressing plate 1 towards the second hot pressing plate 2, which plays a fixing role on the flexible piece 3 on the one hand, and avoids the flexible piece 3 from directly contacting the battery cell 5 to cause damage to the battery cell 5 on the other hand; the flexible piece 3 is made of a material with certain tension, flexibility, excellent insulation, pressure resistance, high temperature resistance, stable chemical properties and flexible deformation.

[0030] In the process of hot pressing the battery cell 5, the battery cell 5 is first placed on the second hot pressing plate 2, and then the first hot pressing plate 1 is driven by the driving piece such as the oil cylinder to move towards the second hot pressing plate 2 until the separation piece 4 contacts the battery cell 5, at which time the first hot pressing plate 1 is continuously driven to move towards the second hot pressing plate 2 to hot-press the battery cell 5. In this process, for the battery cell 5 with uneven thickness, the flexible piece 3 can adaptively deform, so that the flexible piece 3 can be held on the surface of the entire battery cell 5, thereby compacting each position of the battery cell 5 with different thickness, fully compacting the battery cell 5, and further reducing the selection waste.

[0031] In the embodiment, the first hot pressing plate 1 is provided with a mounting plate 11 on one side, and the spacer 4 comprises a spacer part 41 and a tensioning part 42. One end of the spacer part 41 is connected to the first hot pressing plate 1, the other end of the spacer part 41 is connected to one end of the tensioning part 42, and the other end of the tensioning part 42 is connected to the mounting plate 11.

[0032] The mounting plate 11 is arranged on the side of the first hot pressing plate 1, parallel to the first hot pressing plate 1 and close to the surface of the first hot pressing plate 1 away from the second hot pressing plate 2. One end of the spacer part 41 is connected to one side of the first hot pressing plate 1, and the other end of the spacer part 41 extends towards the other side of the first hot pressing plate 1 and is connected to the tensioning part 42. The other end of the tensioning part 42 away from the spacer part 41 is connected to the mounting plate 11.

[0033] The spacer part 41 can avoid the flexible part 3 directly contacting the battery cell 5 to cause damage to the battery cell 5, and the tensioning part 42 can tension the spacer part 41. On the one hand, the flexible part 3 can be effectively fixed, and on the other hand, the spacer part 41 can be pulled flat to ensure that the flexible part 3 is flatly attached to the first hot pressing plate 1 and the spacer part 41 is flatly attached to the flexible part 3, so as to avoid leaving marks on the battery cell 5 during hot pressing.

[0034] In the embodiment, the spacer part 41 covers the flexible part 3, and the spacer part 41 is made of a thin material capable of directly contacting the battery cell 5.

[0035] The spacer part 41 is made of a thin material capable of directly contacting the battery cell 5, and the spacer part 41 covers the flexible part 3. During hot pressing of the battery cell 5, the spacer part 41 directly contacts the battery cell 5 and is not easy to cause damage to the battery cell 5.

[0036] In an alternative embodiment, the spacer part 41 is made of Teflon material.

[0037] It should be noted that Teflon is also called polytetrafluoroethylene, and the spacer part 41 is a Teflon cloth made of Teflon material. Since the Teflon material is resistant to high temperature and has a very low friction coefficient, the Teflon cloth is not easy to cause damage to the battery cell 5 when it contacts the battery cell 5.

[0038] In the embodiment, the tensioning part 42 is a spring, one end of the spring is connected to the spacer part 41, and the other end of the spring is connected to the mounting plate 11.

[0039] Since the mounting plate 11 is close to the surface of the first hot pressing plate 1 away from the second hot pressing plate 2, when the spring is connected to the spacer part 41, the part of the spacer part 41 on the side of the first hot pressing plate 1 extends upwardly and obliquely, which can effectively fix the flexible part 3 between the first hot pressing plate 1 and the spacer part 41.

[0040] In other embodiments, the tensioning part 42 can also be an elastic piece or other elastic part, as long as it can have the effect of tensioning the spacer part 41.

[0041] In this embodiment, hooks are arranged on the mounting plate 11, and the end of the spring away from the isolation portion 41 is hung on the hooks.

[0042] The end of the spring away from the isolation portion 41 is hung on the hooks on the mounting plate 11, when it is needed to take out the flexible member 3, the spring is taken off the hooks, the tension on the isolation portion 41 is released, at this time, the flexible member 3 can be easily taken out from between the isolation portion 41 and the first hot pressing plate 1, and when it is needed to install a new flexible member 3, the new flexible member 3 is placed between the isolation portion 41 and the first hot pressing plate 1, and the end of the spring away from the isolation portion 41 is hung on the hooks on the mounting plate 11, the dismounting efficiency of the flexible member 3 is improved.

[0043] In other embodiments, the end of the spring away from the isolation portion 41 can also be provided with a latch, and a plug hole is arranged on the mounting plate 11, the latch is plugged into the plug hole and is in interference fit with the plug hole, the flexible member 3 can also be fixed between the first hot pressing plate 1 and the isolation portion 41.

[0044] In this embodiment, the number of springs is multiple, and the multiple springs are uniformly and spacedly arranged along the direction perpendicular to the connecting line of the first hot pressing plate 1 and the second hot pressing plate 2, and each spring is connected between the isolation portion 41 and the mounting plate 11.

[0045] It should be noted that the direction perpendicular to the connecting line of the first hot pressing plate 1 and the second hot pressing plate 2 is the length direction of the first hot pressing plate 1 or the second hot pressing plate 2, the length direction of the flexible member 3 is consistent with the length direction of the first hot pressing plate 1 or the second hot pressing plate 2, the flexible member 3 is plate-shaped, and the flexible member 3 covers the surface of the whole battery cell 5, so as to compact each part of the battery cell 5.

[0046] The multiple springs are uniformly and spacedly arranged along the direction perpendicular to the connecting line of the first hot pressing plate 1 and the second hot pressing plate 2, and correspondingly, multiple hooks are uniformly and spacedly arranged on the mounting plate 11, and the multiple springs are one-to-one hung on the multiple hooks, so that the isolation portion 41 can be kept flat while being tensioned.

[0047] In this embodiment, the elastic modulus of the flexible member 3 is 1.5-3.3 MPa.

[0048] By limiting the elastic modulus of the flexible member 3 to 1.5-3.3 MPa, the flexible member 3 can not only deform to fit each part of the battery cell 5 with uneven thickness, but also has a certain rigidity, so that the flexible member 3 can effectively compact each position of the battery cell 5 with uneven thickness more sufficiently in the process of pressing the battery cell 5.

[0049] Exemplarily, the elastic modulus of the flexible piece 3 is 1.5 MPa, 1.8 MPa, 2.0 MPa, 2.4 MPa, 2.7 MPa, 3.0 MPa or 3.3 MPa. It can be understood that the elastic modulus of the flexible piece 3 can be selected within the above range according to actual working conditions.

[0050] In some optional embodiments, the flexible piece 3 is a silica gel pad or a silica gel foam.

[0051] The silica gel pad or the silica gel foam with the elastic modulus in the range of 1.5-3.3 MPa can be deformed and has a certain rigidity, so that the various positions of the battery cell 5 with uneven thickness can be effectively compacted during the pressing of the battery cell 5.

[0052] In some optional embodiments, the thickness of the flexible piece 3 is 1-2 mm.

[0053] Exemplarily, the thickness of the flexible piece 3 is 1.0 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm or 2.0 mm. It can be understood that the thickness of the flexible piece 3 can be selected within the above range according to actual working conditions.

[0054] The technical effects of the hot-pressing device provided by the embodiments of the present application at least include that for the battery cell 5 with uneven thickness, the flexible piece 3 can be deformed adaptively, so that the flexible piece 3 can be pressed on the entire surface of the battery cell 5, thereby compacting the various positions of the battery cell 5 with different thicknesses, fully compacting the battery cell 5, and further reducing the waste of selection; the flexible piece 3 is pressed on the surface of the first hot-pressing plate 1 facing the second hot-pressing plate 2 by the isolation piece 4, which on the one hand plays a fixing role on the flexible piece 3 and on the other hand avoids the damage of the battery cell 5 caused by the direct contact between the flexible piece 3 and the battery cell 5; the tensioning part 42 can tension the isolation part 41, which on the one hand can effectively fix the flexible piece 3 and on the other hand can pull the isolation part 41 flat to ensure that the flexible piece 3 is flatly attached to the first hot-pressing plate 1 and the isolation part 41 is flatly attached to the flexible piece 3, so as to avoid the generation of marks on the battery cell 5 during hot-pressing; by limiting the elastic modulus of the flexible piece 3 to 1.5-3.3 MPa, the flexible piece 3 can be deformed to fit the various parts of the battery cell 5 with uneven thickness and has a certain rigidity, so that the various positions of the battery cell 5 with uneven thickness can be effectively compacted during the pressing of the battery cell 5.

[0055] In summary, the embodiment of the application provides a hot pressing device. In the process of hot pressing the battery cell 5, the battery cell 5 is first placed on the second hot pressing plate 2, then the first hot pressing plate 1 is driven to move towards the second hot pressing plate 2 by using the oil cylinder or the like driving member, until the isolation part 41 contacts the battery cell 5, at this time, the first hot pressing plate 1 is continuously driven to move towards the second hot pressing plate 2 to hot press the battery cell 5. In this process, for the battery cell 5 with uneven thickness, the flexible member 3 can adaptively deform, so that the flexible member 3 can be pressed on the surface of the entire battery cell 5, thereby compacting each position of the battery cell 5 with different thickness, fully compacting the battery cell 5, and further reducing the selection waste.

[0056] The above merely describes the specific embodiments of the application, but the protection scope of the application is not limited to this. Any changes or replacements within the technical scope disclosed by the application can be easily thought by those skilled in the art, and should be covered within the protection scope of the application. Therefore, the protection scope of the application should be subject to the protection scope of the claims.

Claims

1. A hot press apparatus, characterized by, The device comprises a support, a driving mechanism, a first hot pressing plate, a second hot pressing plate, a flexible piece and an isolating piece, the driving mechanism and the second hot pressing plate are arranged on the support, the second hot pressing plate is used for bearing the battery cell, the driving mechanism is connected with the first hot pressing plate to drive the first hot pressing plate to move towards or away from the second hot pressing plate. The isolating piece is arranged on the first hot pressing plate, the flexible piece is located between the isolating piece and the first hot pressing plate, and the isolating piece holds the flexible piece on the surface of the first hot pressing plate towards the second hot pressing plate, so that the flexible piece is attached to the first hot pressing plate.

2. The hot press apparatus according to claim 1, wherein One side of the first hot pressing plate is provided with a mounting plate, the isolating piece comprises an isolating part and a tensioning part, one end of the isolating part is connected with the first hot pressing plate, the other end of the isolating part is connected with one end of the tensioning part, and the other end of the tensioning part is connected with the mounting plate.

3. The hot press apparatus according to claim 2, wherein The isolating part covers the flexible piece, and the isolating part is made of a thin material capable of directly contacting the battery cell.

4. The hot press apparatus according to claim 3, wherein The isolating part is made of Teflon material.

5. The hot press apparatus of claim 2, wherein The tensioning part is a spring, one end of the spring is connected with the isolating part, and the other end of the spring is connected with the mounting plate.

6. The hot press apparatus of claim 5, wherein A hook is arranged on the mounting plate, and the end of the spring away from the isolating part is hung on the hook.

7. The hot press apparatus of claim 5, wherein The number of the springs is multiple, and the multiple springs are uniformly arranged along the direction perpendicular to the connecting line of the first hot pressing plate and the second hot pressing plate, and each spring is connected between the isolating part and the mounting plate.

8. The hot press apparatus of claim 1, wherein The flexible piece is plate-shaped, and the elastic modulus of the flexible piece is 1.5-3.3 MPa.

9. The hot press apparatus of claim 1, wherein The flexible piece is a silica gel pad or a silica gel foam.

10. The hot press apparatus of claim 1, wherein The thickness of the flexible piece is 1-2 mm.

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