Cell forming equipment and winding machine

Abstract

The utility model provides a battery cell forming device and a winding machine, wherein the battery cell forming device comprises: a first pressing assembly, the first pressing assembly comprises a first pressing plate and two second pressing plates, the first pressing plate extends along a first direction, the two second pressing plates are spaced apart along the first direction and are arranged at both ends of the first pressing plate; a second pressing assembly, the second pressing assembly and the first pressing assembly are spaced apart in the second direction to form an accommodating space suitable for accommodating the battery cell, and the second direction intersects with the first direction; a driving assembly, the driving assembly is used to drive at least two of the first pressing plate, the second pressing plate and the second pressing assembly to move along the second direction. The battery cell forming device of the utility model sets the first pressing assembly as a split structure, first uses the first pressing plate and the second pressing assembly to clamp the middle part of the battery cell, and then allows the clamping needle assembly to withdraw from the battery cell, which can avoid the inner ring of the battery cell from loosening, reduce the gap between the pole pieces and between the pole pieces and the diaphragm, and improve the performance of the battery cell.

Description

Technical Field

[0001] The utility model relates to the technical field of battery manufacturing, and more specifically, to a battery core forming device and a winding machine with the battery core forming device. Background Art

[0002] In the related art, the wound battery cell needs to be transported to the battery cell forming device by the clamping needle assembly for pre-pressing. The existing battery cell forming device is mainly composed of an upper pressing plate and a lower pressing plate. During the pre-pressing process, the upper pressing plate moves downward to apply pressure to the battery cell so that the upper pressing plate is close to the upper surface of the battery cell. At this time, the battery cell is not completely compacted. Then the clamping needle assembly is pulled out of the battery cell, and the upper pressing plate continues to apply pressure to the battery cell to complete the pre-pressing of the battery cell. However, during the above-mentioned pre-pressing process, since the material strip of the inner ring of the battery cell is not completely compressed, the inner ring of the battery cell will become loose when the clamping needle assembly pulls out the material, thereby increasing the gap between the pole pieces and between the pole pieces and the diaphragm in the battery cell (i.e., the battery cell gap), which ultimately affects the battery cell performance. Utility Model Content

[0003] The utility model provides a new technical solution for a battery core forming device, which can at least solve the problems in the prior art that the inner ring is easy to loosen and the gap between the battery core substrates becomes larger during the battery core pre-pressing process.

[0004] The utility model also provides a winding machine, comprising the above-mentioned battery core forming device.

[0005] According to the first aspect of the utility model, a battery cell forming device is provided, comprising: a first pressing assembly, the first pressing assembly comprising a first pressing plate and two second pressing plates, the first pressing plate extending along a first direction, the two second pressing plates being spaced apart along the first direction and arranged at both ends of the first pressing plate; a second pressing assembly, the second pressing assembly being spaced apart from the first pressing assembly in a second direction to form an accommodating space suitable for accommodating battery cells, the second direction intersecting with the first direction; and a driving assembly, the driving assembly being used to drive at least two of the first pressing plate, the second pressing plate and the second pressing assembly to move along the second direction.

[0006] Optionally, the driving assembly includes: a first driving mechanism and a second driving mechanism, the first driving mechanism is used to drive the first pressing plate to move along the second direction, and the second driving mechanism is used to drive the second pressing plate to move along the second direction.

[0007] Optionally, the battery cell forming device is switchable between a first state, a second state and a third state. When the battery cell forming device is in the first state, one of the first pressing assembly and the second pressing assembly abuts against the battery cell, and the other is separated from the battery cell; when the battery cell forming device is in the second state, the first pressing plate and the second pressing assembly clamp the middle of the battery cell, and two second pressing plates are separated from the battery cell; when the battery cell forming device is in the third state, the first pressing plate and the second pressing assembly clamp the middle of the battery cell, and two second pressing plates and the second pressing assembly clamp both ends of the battery cell.

[0008] Optionally, a side surface of the second pressing assembly facing the first pressing assembly is formed as a first reference surface, and the first pressing plate and the two second pressing plates are movable along the second direction relative to the first reference surface.

[0009] Optionally, a side surface of the first pressing plate facing the second pressing assembly is formed as a second reference surface, and the second pressing assembly and the two second pressing plates are movable along the second direction relative to the second reference surface.

[0010] Optionally, the second pressing assembly includes: a third pressing plate, which is arranged opposite to the first pressing plate and extends along the first direction; two fourth pressing plates, which are arranged one-to-one with the two second pressing plates, and the two fourth pressing plates are spaced apart along the first direction and arranged at both ends of the third pressing plate; and the driving assembly is used to drive the third pressing plate to move along the second direction.

[0011] Optionally, the battery cell forming device is switchable between a first position, a second position and a third position. When the battery cell forming device is in the first position, one of the first pressing assembly and the second pressing assembly abuts against the battery cell, and the other is separated from the battery cell; when the battery cell forming device is in the second position, the first pressing plate and the third pressing plate clamp the middle of the battery cell, and the second pressing plate and the fourth pressing plate are respectively separated from the battery cell; when the battery cell forming device is in the third position, the first pressing plate and the third pressing plate clamp the middle of the battery cell, and two of the second pressing plates and two of the fourth pressing plates clamp both ends of the battery cell.

[0012] Optionally, a center plane of the battery cell in the second direction is formed as a fourth reference plane, and the first pressing plate, two second pressing plates, the third pressing plate and two fourth pressing plates are movable along the second direction relative to the fourth reference plane.

[0013] Optionally, a side surface of the fourth pressing plate facing the first pressing assembly is formed as a fifth reference surface, and the first pressing plate, the two second pressing plates and the third pressing plate are movable along the second direction relative to the fifth reference surface.

[0014] Optionally, the distance between the first pressure plate and the fourth reference plane is L1, the distance between the second pressure plate and the fourth reference plane is L2, the distance between the third pressure plate and the fourth reference plane is L3, and the distance between the fourth pressure plate and the fourth reference plane is L4. When the battery cell forming device is in the second position and the third position, L1=L3, and when the battery cell forming device is in the third position, L2=L4.

[0015] Optionally, the battery cell forming device also includes: a conveying mechanism, the conveying mechanism includes a conveyor belt, the conveyor belt conveys the battery cell along the first direction, at least a portion of the conveyor belt is arranged between the first pressing assembly and the second pressing assembly; a cache mechanism, the cache mechanism is connected to the conveyor belt, and is used to store or release the conveyor belt; when the battery cell forming device is in the first position or the third position, the cache mechanism stores the conveyor belt; when the battery cell forming device is in the second position, the cache mechanism releases the conveyor belt.

[0016] Optionally, the caching mechanism includes: a movable wheel, which is in contact with the conveyor belt and is movable in its own radial direction to store or release the conveyor belt; and a driving member, which is connected to the movable wheel and drives the movable wheel to move in its own radial direction.

[0017] According to the second aspect of the utility model, a winding machine is provided, comprising: a battery cell forming device, wherein the battery cell forming device is the battery cell forming device described in any one of the above embodiments; a clamping needle assembly, wherein two of the clamping needle assemblies are spaced apart along the first direction to clamp the battery cell, and the clamping needle assembly is used to clamp the battery cell.

[0018] According to the battery cell forming device of the utility model, the first pressing assembly is arranged as a split structure, so that relative movement can be generated between the first pressing plate and the second pressing plate, so that during the battery cell shaping process, the first pressing plate and the second pressing assembly can be used to clamp the middle part of the battery cell, and then the clamping needle assembly can be withdrawn from the battery cell, and then the second pressing plate and the second pressing assembly can be used to clamp the two ends of the battery cell, and the first pressing assembly and the second pressing assembly can be used together to continue to pre-press and form the battery cell, which can avoid loosening of the inner ring of the battery cell and reduce the gap between the pole pieces and between the pole pieces and the diaphragm, thereby helping to improve the quality of the battery cell pre-pressing and improve the performance of the battery cell.

[0019] Other features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention.

[0021] Figure 1 It is a schematic diagram of a battery core forming device in the prior art;

[0022] Figure 2 It is a schematic diagram of a battery cell after pre-pressing in the prior art;

[0023] Figure 3 It is a schematic diagram of the battery core forming device according to the first embodiment of the utility model in the second state and when the clamping needle assembly has not been withdrawn from the battery core;

[0024] Figure 4 It is a schematic diagram of the battery core forming device according to the first embodiment of the utility model in the second state and after the clamping needle assembly is withdrawn from the battery core;

[0025] Figure 5 is a schematic diagram of the battery core forming device in the third state according to the first embodiment provided by the utility model;

[0026] Figure 6 It is a schematic diagram of a battery core forming device according to a second embodiment of the utility model being in a second position and the clamping needle assembly not being removed from the battery core;

[0027] Figure 7 It is a schematic diagram of the battery core forming device according to the second embodiment of the utility model being in the second position and the clamping needle assembly being withdrawn from the battery core;

[0028] Figure 8 is a schematic diagram of a battery core forming device according to a second embodiment of the utility model in a third position;

[0029] Fig. 9 is a schematic diagram of a battery core forming device according to a third embodiment of the present utility model in a first position;

[0030] Fig.10 It is a schematic diagram of a battery core forming device according to a third embodiment of the utility model being in a second position and the clamping needle assembly not being removed from the battery core;

[0031] Fig.11 is a schematic diagram of a battery core forming device in a third position according to a third embodiment of the present utility model;

[0032] Fig.12 It is a schematic diagram of a battery cell forming device according to a third embodiment of the present utility model being in a first position and the battery cell having completed pre-pressing.

[0033] Reference numerals

[0034] A battery cell forming device 100;

[0035] First pressing assembly 10; first pressing plate 11; second pressing plate 12

[0036] A second pressing assembly 20; a third pressing plate 21; a fourth pressing plate 22;

[0037] Conveying mechanism 30; conveying belt 31; conveying wheel 32;

[0038] Cache mechanism 40; movable wheel 41; driving member 42;

[0039] Accommodation space 50;

[0040] Clamping needle assembly 200; inner clamping needle 201; outer clamping needle 202;

[0041] Battery cell 300; cathode 302; anode 301;

[0042] Upper pressing plate 400; Lower pressing plate 500;

[0043] First reference plane A; second reference plane B; third reference plane C; fourth reference plane D; fifth reference plane E. DETAILED DESCRIPTION

[0044] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention.

[0045] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present invention, its application, or uses.

[0046] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0047] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0048] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0049] like Figure 1 As shown, the conventional cell shaping device is mainly composed of an upper pressing plate 400 and a lower pressing plate 500, which are arranged in an upper and lower interval, and the upper pressing plate 400 is located above the lower pressing plate 500. After the cell 300 is fed between the lower pressing plate 500 and the upper pressing plate 400 by the clamping needle assembly 200, the upper pressing plate 400 moves downward to apply pressure to the cell 300, so that the upper pressing plate 400 is close to the upper surface of the cell 300, and the cell 300 is not completely compacted at this time. If the cell 300 is completely compacted, the clamping needle assembly 200 cannot be pulled out of the cell 300. Therefore, in the actual shaping process, after the upper pressing plate 400 presses the upper surface of the cell 300, the clamping needle assembly 200 is pulled out of the cell 300, and then the upper pressing plate 400 continues to apply pressure to the cell 300 to complete the pre-compression of the cell 300.

[0050] Since the inner ring of the battery cell 300 is not completely compressed when the clamping needle assembly 200 removes the material, the inner ring of the battery cell 300 may become loose when the clamping needle assembly 200 removes the material, thereby increasing the gap between the pole pieces and between the pole pieces and the diaphragm in the battery cell 300, which ultimately affects the performance of the battery cell 300. Figure 2 As shown, the gap between the positive electrode sheet and the negative electrode sheet is S, and the battery cell 300S pre-pressed by the traditional battery cell forming device will become larger.

[0051] The following first describes in detail the battery cell forming device 100 according to an embodiment of the present utility model with reference to the accompanying drawings.

[0052] like Figures 3 to 12 As shown, the battery cell forming device 100 according to the embodiment of the utility model includes: a first pressing assembly 10, a second pressing assembly 20 and a driving assembly (not shown in the figure).

[0053] Specifically, the first pressing assembly 10 includes a first pressing plate 11 and two second pressing plates 12. The first pressing plate 11 extends along a first direction. The two second pressing plates 12 are spaced apart along the first direction and are disposed at both ends of the first pressing plate 11. The second pressing assembly 20 is spaced apart from the first pressing assembly 10 in the second direction to form an accommodating space 50 suitable for accommodating the battery cell 300, and the second direction intersects with the first direction. The driving assembly is used to drive at least two of the first pressing plate 11, the second pressing plate 12, and the second pressing assembly 20 to move along the second direction.

[0054] In other words, the battery cell forming device 100 according to the embodiment of the present invention is mainly composed of a first pressing assembly 10 and a second pressing assembly 20. The battery cell forming device 100 can shape the battery cell 300 and flatten the wound cylindrical battery cell 300.

[0055] The first pressing assembly 10 may be mainly composed of a first pressing plate 11 and two second pressing plates 12. The first pressing plate 11 may extend along a first direction, so in the first direction, the first pressing plate 11 has two ends, and the two second pressing plates 12 may be spaced apart along the first direction, and the two second pressing plates 12 are arranged at both ends of the first pressing plate 11, which may specifically include but not be limited to the following situations.

[0056] In case 1, the first pressing plate 11 may be located between the two second pressing plates 12, the two ends of the first pressing plate 11 in the first direction are respectively the first end and the second end, one of the two second pressing plates 12 may be arranged at the first end and spaced apart from the first end in the first direction, the other of the two second pressing plates 12 may be arranged at the second end and spaced apart from the second end in the first direction, therefore, the orthographic projection surfaces of the two second pressing plates 12 on one side of the first pressing plate 11 may be completely staggered with the first pressing plate respectively;

[0057] In case 2, two second pressing plates 12 can be arranged at two ends of the first pressing plate 11 in a one-to-one correspondence, and the orthographic projection of each second pressing plate 12 on one side of the first pressing plate 11 can partially overlap with the corresponding end of the first pressing plate 11 .

[0058] In both of the above situations, the first pressing plate 11 can press the middle part of the battery cell 300 , and the second pressing plate 12 can press the end part of the battery cell 300 .

[0059] In addition, the second pressing plate 12 may extend along the first direction.

[0060] In a second direction intersecting the first direction, the first pressing assembly 10 and the second pressing assembly 20 may be spaced apart to form an accommodation space 50 for accommodating the battery cell 300. A side of the first pressing plate 11 facing the battery cell 300, a side of the second pressing plate 12 facing the battery cell 300, and a side of the second pressing assembly 20 facing the battery cell 300 may be parallel to each other and serve as pressing surfaces to press the battery cell 300, so that the two side surfaces of the battery cell 300 after being flattened are parallel to each other.

[0061] In addition, the driving assembly can drive at least two of the first pressing plate 11, the second pressing plate 12 and the second pressing assembly 20 to move along the second direction, so that the distance between the first pressing plate 11 and the second pressing assembly 20 is adjustable, and the distance between each second pressing plate 12 and the second pressing assembly 20 is adjustable. Specific examples include but are not limited to the following.

[0062] In case 1, the second pressing assembly 20 remains stationary, and the first pressing plate 11 and the two second pressing plates 12 can be driven by the driving assembly to move closer to or farther from the second pressing assembly 20;

[0063] In case 2, the first pressing plate 11 remains stationary, and the second pressing assembly 20 and the two second pressing plates 12 can be driven by the driving assembly to move closer to or farther from the first pressing plate 11;

[0064] In case three, the two second pressing plates 12 can remain stationary, and the first pressing plate 11 and the second pressing assembly 20 can be driven by the driving assembly to move closer to or farther from the second pressing plate 12;

[0065] In case four, the first pressing plate 11 , the two second pressing plates 12 and the second pressing assembly 20 can be moved respectively under the driving of the driving assembly, so that the first pressing plate 11 approaches or moves away from the second pressing assembly 20 , and the second pressing plate 12 approaches or moves away from the second pressing assembly 20 .

[0066] It should be noted that the above-mentioned reference objects that remain stationary may include but are not limited to the base of the battery cell forming device 100 and the foundation on which the battery cell forming device 100 is located. The two second pressing plates 12 may move synchronously or asynchronously without limitation.

[0067] Optionally, the drive assembly may include, but is not limited to, a motor-screw-nut assembly, an electric cylinder, and a pneumatic cylinder.

[0068] The shaping process of the battery cell forming device 100 of this embodiment is described in detail below by taking the second direction as the vertical direction as an example.

[0069] The inner clamping pin 201 and the outer clamping pin 202 of the clamping pin assembly 200 cooperate to flatten the battery cell 300 and transfer the battery cell 300 to the accommodation space 50, so that the battery cell 300 abuts against one of the first pressing plate 11 or the second pressing assembly 20. Figure 3 As shown, the distance between the first pressing plate 11 and the second pressing assembly 20 is reduced, so that the first pressing plate 11 and the second pressing assembly 20 clamp the middle part of the battery cell 300. At this time, compared with the battery cell 300 flattened by the clamping needle assembly 200, the upper and lower parts of the clamped battery cell 300 are closer to each other, and the clamping needle assembly 200 will not be pressed by the inner circle of the battery cell 300. Figure 4As shown, the clamping needle assembly 200 withdraws from the battery cell 300. At this time, since the first pressing plate 11 and the second pressing assembly 20 clamp the battery cell 300, the upper and lower surfaces of the inner circle of the battery cell 300 are close to each other. Therefore, when the clamping needle assembly 200 withdraws from the battery cell 300, the inner circle of the battery cell 300 is not easy to loosen. Reduce the distance between the two second pressing plates 12 and the second pressing assembly 20, so that the second pressing plate 12 and the second pressing assembly 20 clamp the two ends of the battery cell 300 in the second direction. At this time, there may still be gaps between the corners of the battery cell 300 and the upper and lower parts of the battery cell 300. Figure 5 As shown, the distance between the first pressing plate 11 and the second pressing assembly 20 is continued to be reduced, and the distance between the second pressing plate 12 and the second pressing assembly 20 is reduced, so that the first pressing plate 11, the second pressing plate 12 and the second pressing assembly 20 continue to apply pressure to the battery cell 300 to complete the pre-pressing of the battery cell 300.

[0070] Therefore, according to the battery cell forming device 100 of the embodiment of the utility model, the first pressing assembly 10 is set as a split structure, so that relative movement can be generated between the first pressing plate 11 and the second pressing plate 12, so that during the shaping process of the battery cell 300, the first pressing plate 11 and the second pressing assembly 20 can be used to clamp the middle part of the battery cell 300, and then the clamping needle assembly 200 can be withdrawn from the battery cell 300, and then the second pressing plate 12 and the second pressing assembly 20 can be used to clamp the two ends of the battery cell 300, and the first pressing assembly 10 and the second pressing assembly 20 can continue to pre-press and form the battery cell 300 together, which can avoid loosening of the inner circle of the battery cell 300 and reduce the gap between the pole pieces and between the pole pieces and the diaphragm, which is beneficial to improve the quality of the pre-pressing of the battery cell 300 and improve the performance of the battery cell 300.

[0071] Optionally, the first direction and the second direction are perpendicular to each other.

[0072] In some optional embodiments, the first direction may be a horizontal direction, and the second direction may be a vertical direction. That is, the first pressing assembly 10 and the second pressing assembly 20 may be arranged spaced apart from each other, the first pressing assembly 10 may be arranged above the second pressing assembly 20, or the second pressing assembly 20 may be arranged above the first pressing assembly 10, which is not limited here.

[0073] In some optional embodiments, the driving assembly includes a first driving mechanism and a second driving mechanism, the first driving mechanism is used to drive the first pressing plate 11 to move along the second direction, and the second driving mechanism is used to drive the second pressing plate 12 to move along the second direction.

[0074] Specifically, the first pressing plate 11 can be driven by the first driving mechanism to move closer to or farther from the second pressing assembly 20, and the second pressing plate 12 can be driven by the second driving mechanism to move closer to or farther from the second pressing assembly 20. The first driving mechanism and the second driving mechanism can include but are not limited to a motor screw nut, an electric cylinder or a pneumatic cylinder.

[0075] According to one embodiment of the utility model, the battery cell forming device 100 can be switched between a first state, a second state and a third state. When the battery cell forming device 100 is in the first state, one of the first pressing assembly 10 and the second pressing assembly 20 is in contact with the battery cell 300, and the other is spaced apart from the battery cell 300. When the battery cell forming device 100 is in the second state, the first pressing plate 11 and the second pressing assembly 20 clamp the middle of the battery cell 300, and the two second pressing plates 12 are spaced apart from the battery cell 300. When the battery cell forming device 100 is in the third state, the first pressing plate 11 and the second pressing assembly 20 clamp the middle of the battery cell 300, and the two second pressing plates 12 and the second pressing assembly 20 clamp both ends of the battery cell 300.

[0076] In other words, the battery cell forming device 100 has at least three states, and the battery cell forming device 100 can switch between the three states.

[0077] Specifically, after the clamping assembly flattens the battery cell 300, the battery cell 300 can be transported to the accommodating space 50. At this time, the battery cell forming device 100 can be in the first state, and the battery cell 300 can be abutted against one of the first pressing assembly 10 and the second pressing assembly 20, and spaced apart from the other of the first pressing assembly 10 and the second pressing assembly 20, so that the battery cell 300 can freely enter and exit the accommodating space 50.

[0078] For example, the first pressing plate 11 is located on the side of the battery cell 300 away from the second pressing assembly 20, and the first pressing plate 11 is spaced apart from the outer surface of the battery cell 300, and the second pressing plate 12 is located on the side of the battery cell 300 away from the second pressing assembly 20, and the second pressing plate 12 is spaced apart from the surface of the battery cell 300.

[0079] Then the battery cell forming device 100 can switch itself from the first state to the second state by adjusting the distance between the first pressing plate 11 and the second pressing assembly 20. In the second state, the first pressing plate 11 can clamp the middle of the battery cell 300 with the second pressing assembly 20, and apply pressure to the battery cell 300, so that the middle of the battery cell 300 is deformed inwards. At this time, neither of the two second pressing plates 12 is in contact with the battery cell 300. Then, after the middle of the battery cell 300 is clamped and collapsed, the clamping needle assembly 200 is withdrawn from the battery cell 300.

[0080] Then the battery cell forming device 100 can be switched from the second state to the third state. In the third state, the first pressing plate 11 can clamp the middle of the battery cell 300 with the second pressing assembly 20, and the two second pressing plates 12 respectively cooperate with the second pressing assembly 20 to clamp the ends of the battery cell 300, and the first pressing plate 11, the second pressing plate 12 and the second pressing assembly 20 apply pressure to the battery cell 300, so that the battery cell 300 is deformed until the battery cell 300 is pre-pressed and formed.

[0081] In this embodiment, according to the split structure of the first pressing assembly 10, the battery cell forming device 100 is set to switch between at least three states. The split structure can be used to achieve step-by-step pre-pressing of the battery cell 300. First, the center of the battery cell 300 is pressed down to prevent the inner circle of the battery cell 300 from loosening when the clamping needle assembly 200 is withdrawn, and then pressure is applied to both ends of the battery cell 300 to complete the pre-pressing of the battery cell 300.

[0082] Optionally, there may be a fourth state after the third state. In the second state, the battery cell forming device 100 can be switched from the second state to the third state by adjusting the distance between the second pressing plate 12 and the second pressing assembly 20. In the third state, the middle and ends of the battery cell 300 are clamped, but there is still a gap in the inner circle of the battery cell 300, and the side of the first pressing plate 11 facing the battery cell 300 and the side of the second pressing plate 12 facing the battery cell 300 can be flush. Then, by synchronously adjusting the distance between the first pressing plate 11 and the second pressing assembly 20 and the distance between the second pressing plate 12 and the second pressing assembly 20, the battery cell forming device 100 can be switched from the third state to the fourth state, for example, the first pressing plate 11 and the second pressing plate 12 are close to the second pressing assembly 20 at the same speed, or the second pressing assembly 20 is close to the first pressing assembly 10. In the fourth state, the battery cell 300 is completely flattened, and the upper and lower surfaces of the inner circle of the battery cell 300 are in contact with each other.

[0083] According to some other embodiments of the present invention, a side surface of the second pressing assembly 20 facing the first pressing assembly 10 is formed as a first reference surface A, and the first pressing plate 11 and the two second pressing plates 12 are movable along the second direction relative to the first reference surface A respectively.

[0084] Specifically, one side surface of the second pressing assembly 20 can be defined as a first reference surface A, and the first pressing plate 11 and the second pressing plate 12 are both opposite to the first reference surface A and are spaced apart from the first reference surface A in the second direction to form an accommodating space 50 .

[0085] During the shaping process of the battery cell 300, the first reference surface A can remain stationary, for example, the second pressing assembly 20 can be fixedly connected to the base of the battery cell forming device 100. The first pressing plate 11 and the second pressing plate 12 can be connected to the driving assembly respectively.

[0086] Driven by the driving component, the first pressing plate 11 can approach or move away from the first reference plane A along the second direction to achieve an adjustable distance between the first pressing plate 11 and the second pressing assembly 20, and the two second pressing plates 12 can respectively approach or move away from the first reference plane A along the second direction to achieve an adjustable distance between the second pressing plate 12 and the second pressing assembly 20.

[0087] The shaping process of the battery cell shaping device 100 of this embodiment is described in detail below.

[0088] like Figures 3 to 5 As shown, the second pressing assembly 20 can remain stationary during the shaping process. After the battery cell 300 is conveyed to the accommodating space 50, in the first state, the first pressing plate 11 and the second pressing plate 12 can be flush, the battery cell 300 abuts against the first reference surface A, and is spaced apart from the first pressing assembly 10. Then the first pressing plate 11 moves downward, so that the battery cell forming device 100 switches from the first state to the second state. In the second state, the first pressing plate 11 and the second pressing assembly 20 clamp the battery cell 300. Then the second pressing plate 12 moves downward, so that the battery cell forming device 100 switches from the second state to the third state. In the third state, the first pressing plate 11 and the second pressing plate 12 can be flush, and together with the second pressing assembly 20 clamp the battery cell 300. Afterwards, the first pressing plate 11 and the second pressing plate 12 can continue to approach the second pressing assembly 20 at the same speed, thereby continuing to pressurize the battery cell 300 and completing the pre-pressing molding of the battery cell 300.

[0089] In some specific embodiments of the present invention, a side surface of the first pressing plate 11 facing the second pressing assembly 20 is formed as a second reference surface B, and the second pressing assembly 20 and the two second pressing plates 12 are movable along the second direction relative to the second reference surface B respectively.

[0090] Specifically, one side surface of the first pressing plate 11 may be defined as the second reference surface B, and the second pressing assembly 20 is disposed opposite to the second reference surface B and is spaced apart from the second reference surface B in the second direction to form an accommodating space 50 .

[0091] During the shaping process of the battery cell 300, the second reference surface B can remain stationary, for example, the first pressing plate 11 can be fixedly connected to the base of the battery cell forming device 100. The two second pressing plates 12 and the second pressing assembly 20 can be connected to the driving assembly respectively.

[0092] Driven by the driving component, the second pressing component 20 can approach or move away from the first pressing plate 11 along the second direction to achieve an adjustable distance between the first pressing plate 11 and the second pressing component 20, and the second pressing plate 12 can approach or move away from the second pressing component 20 along the second direction to achieve an adjustable distance between the second pressing plate 12 and the second pressing component 20.

[0093] The shaping process of the battery cell shaping device 100 of this embodiment is described in detail below.

[0094] The first pressing plate 11 can remain stationary during the shaping process. After the battery cell 300 is transported to the accommodation space 50, in the first state, the battery cell 300 abuts against the second reference surface B and is spaced apart from the second pressing assembly 20. Then the second pressing assembly 20 approaches the first pressing plate 11, and at the same time the second pressing plate 12 moves in a direction away from the second pressing assembly 20, so that the battery cell forming device 100 switches from the first state to the second state. In the second state, the first pressing plate 11 and the second pressing assembly 20 clamp the battery cell 300, and the second pressing plate 12 is spaced apart from the battery cell 300. Then the second pressing plate 12 approaches the second pressing assembly 20, so that the battery cell forming device 100 switches from the second state to the third state. In the third state, the first pressing plate 11 and the second pressing plate 12 can be flush, and together cooperate with the second pressing assembly 20 to clamp the battery cell 300. Afterwards, the first pressing assembly 10 may continue to approach the second pressing assembly 20 , thereby continuing to apply pressure to the battery cell 300 , thereby completing the pre-pressing and forming of the battery cell 300 .

[0095] According to some optional embodiments of the present invention, a side surface of the second pressing plate 12 facing the second pressing assembly 20 is formed as a third reference plane C, and the second pressing assembly 20 and the first pressing plate 11 are movable along the second direction relative to the third reference plane C respectively.

[0096] Specifically, one side surface of the second pressing plate 12 may be defined as a third reference plane C, and the second pressing assembly 20 is disposed opposite to the third reference plane C and is spaced apart from the third reference plane C in the second direction to form an accommodating space 50 .

[0097] During the shaping process of the battery cell 300, the third reference plane C can remain stationary, for example, the two second pressing plates 12 can be fixedly connected to the base of the battery cell forming device 100. The first pressing plate 11 and the second pressing assembly 20 can be connected to the driving assembly respectively.

[0098] Driven by the driving component, the first pressing plate 11 and the second pressing component 20 can be close to or away from each other to achieve an adjustable distance between the first pressing plate 11 and the second pressing component 20, and the second pressing component 20 can be close to or away from the second pressing plate 12 along the second direction to achieve an adjustable distance between the second pressing plate 12 and the second pressing component 20.

[0099] The shaping process of the battery cell shaping device 100 of this embodiment is described in detail below.

[0100] The two second pressing plates 12 can remain stationary during the shaping process. After the battery cell 300 is transported to the accommodation space 50, in the first state, the battery cell 300 abuts against the second pressing assembly 20 and is spaced apart from the first pressing assembly 10. Then the first pressing plate 11 approaches the second pressing assembly 20, so that the battery cell forming device 100 switches from the first state to the second state. In the second state, the first pressing plate 11 and the second pressing assembly 20 clamp the battery cell 300, and the second pressing plate 12 is spaced apart from the battery cell 300. Then the second pressing assembly 20 and the first pressing plate 11 approach the second pressing plate 12 together at the same speed, so that the battery cell forming device 100 switches from the second state to the third state. In the third state, the first pressing plate 11 and the second pressing plate 12 can be flush, and together cooperate with the second pressing assembly 20 to clamp the battery cell 300. Afterwards, the first pressing assembly 10 can continue to approach the second pressing assembly 20, thereby continuing to pressurize the battery cell 300 and completing the pre-pressing molding of the battery cell 300.

[0101] According to some other embodiments of the present invention, Figures 6 to 12 As shown, the second pressing assembly 20 includes: a second pressing plate 12 and two fourth pressing plates 22. The third pressing plate 21 is arranged opposite to the first pressing plate 11, and the third pressing plate 21 extends along the first direction. The two fourth pressing plates 22 are arranged one-to-one with the two second pressing plates 12, and the two fourth pressing plates 22 are spaced apart along the first direction and arranged at both ends of the third pressing plate 21. The driving assembly is used to drive the third pressing plate 21 to move along the second direction.

[0102] In other words, the second pressing assembly 20 may be mainly composed of a third pressing plate 21 and two fourth pressing plates 22. The third pressing plate 21 may extend in the first direction, so that in the first direction, the third pressing plate 21 has two ends, the two fourth pressing plates 22 may be spaced apart in the first direction, and the third pressing plate 21 may be located between the two fourth pressing plates 22. The fourth pressing plate 22 may extend in the first direction. The first pressing plate 11 is disposed opposite to the third pressing plate 21, the second pressing plate 12 is disposed opposite to the fourth pressing plate 22, and the two second pressing plates 12 correspond to the two fourth pressing plates 22 one by one.

[0103] The first pressing plate 11 facing one side of the battery cell 300, the second pressing plate 12 facing one side of the battery cell 300, the third pressing plate 21 facing one side of the battery cell 300, and the fourth pressing plate 22 facing one side of the battery cell 300 can be parallel to each other and serve as pressing surfaces to press the battery cell 300 so that the two side surfaces of the battery cell 300 are parallel to each other after being flattened.

[0104] The driving assembly is used to drive the third pressing plate 21 to move along the second direction, so that the distance between the first pressing plate 11 and the third pressing plate 21 can be adjusted. In addition, the driving assembly can also drive the second pressing plate 12, so that the distance between each second pressing plate 12 and the corresponding fourth pressing plate 22 can be adjusted.

[0105] The shaping process of the battery cell forming device 100 of this embodiment is described in detail below by taking the second direction as the vertical direction as an example.

[0106] The inner clamping needle 201 and the outer clamping needle 202 of the clamping needle assembly 200 cooperate to flatten the battery cell 300 and transfer the battery cell 300 to the accommodating space 50, so that the battery cell 300 is located in the center of the first pressing assembly 10 and the second pressing assembly 20, and is separated from the first pressing assembly 10 and the second pressing assembly 20 respectively.

[0107] like Figure 3 As shown, the distance between the first pressing plate 11 and the third pressing plate 21 is reduced, so that the first pressing plate 11 and the third pressing plate 21 clamp the middle part of the battery cell 300. At this time, compared with the battery cell 300 flattened by the clamping needle assembly 200, the upper and lower parts of the clamped battery cell 300 are closer to each other, and the clamping needle assembly 200 will not be pressed by the inner circle of the battery cell 300. The two ends of the battery cell 300 in the second direction form a centrally symmetrical corner along the horizontal plane. Figure 4 As shown, the clamping needle assembly 200 withdraws from the battery cell 300. At this time, since the first pressure plate 11 and the third pressure plate 21 clamp the battery cell 300, the upper and lower surfaces of the inner circle of the battery cell 300 are close to each other. Therefore, when the clamping needle assembly 200 withdraws from the battery cell 300, the inner circle of the battery cell 300 is not easy to loosen. Reduce the distance between the two second pressure plates 12 and the corresponding fourth pressure plates 22, so that the second pressure plates 12 and the corresponding fourth pressure plates 22 clamp the two ends of the battery cell 300. At this time, there may still be gaps between the corners of the battery cell 300 and the upper and lower parts of the battery cell 300. Figure 5 As shown, the distance between the first pressing plate 11 and the third pressing plate 21 is further reduced, and the distance between the second pressing plate 12 and the fourth pressing plate 22 is further reduced, so as to continue to apply pressure to the battery cell 300 and complete the pre-pressing of the battery cell 300 .

[0108] In this embodiment, the first pressing assembly 10 and the second pressing assembly 20 are both configured as a split structure, and the first pressing plate 11 and the third pressing plate 21 can be used to clamp the middle of the battery cell 300 by approaching each other, thereby evenly applying pressure to both sides of the battery cell 300, which is beneficial to reducing the deformation of the corner area of ​​the battery cell 300, thereby reducing the spacing between the substrates in the battery cell 300, and then withdrawing the clamping needle assembly 200 and clamping the two ends of the battery by the second pressing plate 12 and the fourth pressing plate 22, which is beneficial to further improve the pre-pressing quality of the battery cell 300 and improve the performance of the battery cell 300.

[0109] In some specific embodiments of the present invention, the battery cell forming device 100 can be switched between a first position, a second position and a third position. When the battery cell forming device 100 is in the first position, one of the first pressing assembly 10 and the second pressing assembly 20 abuts against the battery cell 300, and the other is spaced apart from the battery cell 300. When the battery cell forming device 100 is in the second position, the first pressing plate 11 and the third pressing plate 21 clamp the middle of the battery cell 300, and the second pressing plate 12 and the fourth pressing plate 22 are spaced apart from the battery cell 300 respectively. When the battery cell forming device 100 is in the third position, the first pressing plate 11 and the third pressing plate 21 clamp the middle of the battery cell 300, and the two second pressing plates 12 and the two fourth pressing plates 22 clamp the two ends of the battery cell 300.

[0110] In other words, the battery cell forming device 100 has at least three positions, and the battery cell forming device 100 can be switched between the three positions.

[0111] Specifically, after the clamping assembly flattens the battery cell 300, the battery cell 300 can be transported to the accommodating space 50. At this time, the battery cell forming device 100 can be in the first position, and the battery cell 300 can be abutted against one of the first pressing assembly 10 and the second pressing assembly 20, and spaced apart from the other of the first pressing assembly 10 and the second pressing assembly 20.

[0112] For example, the first pressing assembly 10 is located above the second pressing assembly 20 . When the battery cell forming device 100 is in the first position, the battery cell 300 can abut against the upper surface of the second pressing assembly 20 , and the first pressing assembly 10 is spaced apart from the outer surface of the battery cell 300 .

[0113] Then, the battery cell forming device 100 can switch itself from the first state to the second state by reducing the distance between the first pressing plate 11 and the third pressing plate 21. In the second state, Figure 3 and Figure 4 As shown, the first pressing plate 11 and the third pressing plate 21 can clamp the middle of the battery cell 300 and apply pressure to the battery cell 300, so that the middle of the battery cell 300 is deformed inwards. At this time, the two second pressing plates 12 and the two fourth pressing plates 22 are not in contact with the battery cell 300. Then, after the middle of the battery cell 300 is clamped and collapsed, the clamping needle assembly 200 is withdrawn from the battery cell 300.

[0114] Then the battery cell forming device 100 can switch from the second state to the third state. In the third state, Figure 5As shown, the first pressing plate 11 can still clamp the middle part of the battery cell 300 together with the third pressing plate 21, and the two second pressing plates 12 respectively cooperate with the corresponding fourth pressing plates 22 to clamp the ends of the battery cell 300. The first pressing plate 11, the second pressing plate 12, the third pressing plate 21 and the fourth pressing plate 22 respectively apply pressure to the battery cell 300, causing the battery cell 300 to deform until the battery cell 300 is pre-pressed into shape.

[0115] In this embodiment, according to the split structure of the first pressing assembly 10 and the second pressing assembly 20, the battery cell forming device 100 is set to switch between at least three positions. The split structure can be used to realize step-by-step pre-pressing of the battery cell 300, and uniform pressure is applied to both sides of the battery cell 300 to collapse the center of the battery cell 300. This can not only prevent the inner circle of the battery cell 300 from loosening, but also help to reduce the deformation of the corner area of ​​the battery cell 300, thereby reducing the spacing between the substrates in the battery cell 300, and further improving the pre-pressing quality of the battery cell 300 and the performance of the battery cell 300.

[0116] Optionally, the battery cell forming device 100 may also have a fourth position. When the battery cell forming device 100 is in the third position, the middle and ends of the battery cell 300 are clamped, but there is still a gap in the inner circle of the battery cell 300, and the first press plate 11 facing the side of the battery cell 300 and the second press plate 12 facing the side of the battery cell 300 can be flush, and the third press plate 21 facing the side of the battery cell 300 and the fourth press plate 22 facing the side of the battery cell 300 can also be flush. Then, by synchronously reducing the distance between the first press plate 11 and the third press plate 21 and the distance between the second press plate 12 and the corresponding fourth press plate 22, the battery cell forming device 100 can be switched from the third position to the fourth position, for example, the first press plate 11 and the second press plate 12 are close to the second pressing assembly 20 at the same speed, or the third press plate 21 and the fourth press plate 22 are close to the first pressing assembly 10 at the same speed. When the battery cell forming device 100 is in the fourth position, the battery cell 300 is completely flattened, and the upper and lower surfaces of the inner circle of the battery cell 300 are in contact with each other.

[0117] According to some optional embodiments of the present invention, the center plane of the battery cell 300 in the second direction is formed as a fourth reference plane D, and the first pressure plate 11, two second pressure plates 12, the third pressure plate 21 and two fourth pressure plates 22 are movable along the second direction relative to the fourth reference plane D respectively.

[0118] Specifically, after the battery cell 300 is transported to the accommodation space 50 by the clamping needle assembly 200, the center plane of the battery cell 300 in the second direction at this time can be defined as the fourth reference plane D. The first pressing plate 11 and the second pressing plate 12 are located on one side of the fourth reference plane D, and the third pressing plate 21 and the fourth pressing plate 22 are located on the other side of the fourth reference plane D.

[0119] The first pressing plate 11 , the second pressing plate 12 , the third pressing plate 21 and the fourth pressing plate 22 may be connected to the driving assembly respectively.

[0120] Driven by the driving component, the first pressure plate 11 and the third pressure plate 21 can approach or move away from the fourth reference plane D to achieve an adjustable distance between the first pressure plate 11 and the third pressure plate 21, and the second pressure plate 12 and the fourth pressure plate 22 can approach or move away from the fourth reference plane D along the second direction to achieve an adjustable distance between the second pressure plate 12 and the fourth pressure plate 22.

[0121] The shaping process of the battery cell shaping device 100 of this embodiment is described in detail below.

[0122] After the battery cell 300 is transported to the accommodation space 50, when the battery cell forming device 100 is in the first position, the battery cell 300 can be located at the center of the first pressing assembly 10 and the second pressing assembly 20, or the battery cell 300 is in contact with one of the first pressing assembly 10 and the second pressing assembly 20. Then the first pressing plate 11 and the third pressing plate 21 approach the fourth reference plane D, so that the battery cell forming device 100 switches from the first state to the second state. After the first pressing plate 11 and the third pressing plate 21 are in contact with the battery cell 300, the fourth reference plane D is always kept at the center of the first pressing plate 11 and the third pressing plate 21. When the battery cell forming device 100 is in the second position, the first pressing plate 11 and the third pressing plate 21 clamp the battery cell 300, and the second pressing plate 12 and the fourth pressing plate 22 are spaced apart from the battery cell 300. Then the second pressing plate 12 and the fourth pressing plate 22 approach the fourth reference plane D together at the same speed, so that the battery cell forming device 100 switches from the second state to the third state, thereby ensuring that the center of the second pressing plate 12 and the fourth pressing plate 22 always coincides with the center of the battery cell 300. When the battery cell forming device 100 is in the third position, the first pressing plate 11 and the second pressing plate 12 can be flush, and the third pressing plate 21 and the fourth pressing plate 22 can be flush, thereby clamping the battery cell 300. Afterwards, the first pressing assembly 10 can continue to approach the second pressing assembly 20, thereby continuing to pressurize the battery cell 300 and completing the pre-pressing of the battery cell 300.

[0123] According to some other embodiments of the present invention, a side surface of the fourth pressing plate 22 facing the first pressing assembly 10 forms a fifth reference plane E, and the first pressing plate 11, the two second pressing plates 12 and the third pressing plate 21 are movable along the second direction relative to the fifth reference plane E respectively.

[0124] Specifically, a side surface of the fourth pressing plate 22 can be defined as a fifth reference plane E, and the first pressing assembly 10 can be disposed opposite to the fifth reference plane E.

[0125] During the shaping process of the battery cell 300, the fifth reference plane E can remain stationary, which can be achieved by controlling the activities of the first pressing plate 11, the second pressing plate 12 and the third pressing plate 21. The first pressing plate 11, the second pressing plate 12 and the third pressing plate 21 can be connected to the driving assembly respectively.

[0126] Driven by the driving assembly, the first pressure plate 11 and the third pressure plate 21 can be moved closer to or farther away from each other to achieve an adjustable distance between the first pressure plate 11 and the third pressure plate 21, and the second pressure plate 12 can be moved closer to or farther away from the fourth pressure plate 22 along the second direction to achieve an adjustable distance between the second pressure plate 12 and the fourth pressure plate 22.

[0127] The shaping process of the battery cell shaping device 100 of this embodiment is described in detail below.

[0128] The two fourth pressing plates 22 can remain stationary during the shaping process. After the battery cell 300 is transported to the accommodation space 50, when the battery cell forming device 100 is in the first position, the battery cell 300 can be located at the center of the first pressing assembly 10 and the second pressing assembly 20. Then the first pressing plate 11 and the third pressing plate 21 approach each other at the same speed, so that the battery cell forming device 100 switches from the first state to the second state, thereby ensuring that the center of the first pressing plate 11 and the third pressing plate 21 always coincides with the center of the battery cell 300. When the battery cell forming device 100 is in the second position, the first pressing plate 11 and the third pressing plate 21 clamp the battery cell 300, and the second pressing plate 12 and the fourth pressing plate 22 are spaced apart from the battery cell 300. In the second direction, the first pressing plate 11 and the third pressing plate 21 are located between the second pressing plate 12 and the fourth pressing plate 22. Then the first pressing plate 11 and the third pressing plate 21 approach the fifth reference plane E at a first preset speed, and at the same time, the two second pressing plates 12 approach the fifth reference plane E at a second preset speed, which is twice the first preset speed, so that the battery cell forming device 100 switches from the second state to the third state, thereby ensuring that the center of the second pressing plate 12 and the fourth pressing plate 22 always coincides with the center of the battery cell 300. When the battery cell forming device 100 is in the third position, the first pressing plate 11 and the second pressing plate 12 can be flush, and the third pressing plate 21 and the fourth pressing plate 22 can be flush, thereby clamping the battery cell 300. Afterwards, the first pressing assembly 10 can continue to approach the second pressing assembly 20, thereby continuing to pressurize the battery cell 300 and completing the pre-pressing and forming of the battery cell 300.

[0129] In some specific embodiments of the present invention, the distance between the first pressing plate 11 and the fourth reference plane D is L1, the distance between the second pressing plate 12 and the fourth reference plane D is L2, the distance between the third pressing plate 21 and the fourth reference plane D is L3, and the distance between the fourth pressing plate 22 and the fourth reference plane D is L4. When the battery cell forming device 100 is in the second position and the third position, L1=L3, and when the battery cell forming device 100 is in the third position, L2=L4.

[0130] Specifically, from the time when the first pressing plate 11 and the third pressing plate 21 are both in contact with the battery cell to the time when the pre-pressing of the battery cell is completed, the distance between the first pressing plate 11 and the center plane of the battery cell can be equal to the distance between the third pressing plate 21 and the center plane of the battery cell. From the time when the second pressing plate 12 and the corresponding fourth pressing plate 22 are both in contact with the battery cell to the time when the pre-pressing of the battery cell is completed, the distance between the second pressing plate 12 and the center plane of the battery cell can be equal to the distance between the fourth pressing plate 22 and the center plane of the battery cell.

[0131] Therefore, during the pressing process, the centers of the first pressing plate 11 and the third pressing plate 21 always coincide with the center of the battery cell 300, and the centers of the second pressing plate 12 and the fourth pressing plate 22 always coincide with the center of the battery cell 300, which is beneficial to reducing the deformation of the corner area of ​​the battery cell 300, thereby reducing the spacing between the substrates in the battery cell 300, and further improving the pre-pressing quality of the battery cell 300 and the performance of the battery cell 300.

[0132] According to some optional embodiments of the present invention, the battery cell forming device 100 further includes: a conveying mechanism 30 and a buffer mechanism 40. The conveying mechanism 30 includes a conveyor belt 31, which conveys the battery cell 300 along a first direction, and at least a portion of the conveyor belt 31 is disposed between the first pressing assembly 10 and the second pressing assembly 20. The buffer mechanism 40 is connected to the conveyor belt 31 and is used to store or release the conveyor belt 31. When the battery cell forming device 100 is in the first position or the third position, the buffer mechanism 40 stores the conveyor belt 31. When the battery cell forming device 100 is in the second position, the buffer mechanism 40 releases the conveyor belt 31.

[0133] Specifically, the pre-pressed battery cell 300 can be transported to the downstream by the conveyor belt 31 of the conveying mechanism 30. The conveying mechanism 30 is connected with a buffer mechanism 40, and the buffer mechanism 40 can store and release the conveyor belt 31.

[0134] like Figures 9 to 12 As shown, the conveyor belt 31 may be a double-layer structure, the second pressing assembly 20 may be located below the upper conveyor belt 31 , and the first pressing assembly 10 may be located above the upper conveyor belt 31 .

[0135] During the process of switching the battery cell forming device 100 from the first position to the second position, the first pressure plate 11 and the third pressure plate 21 approach the fourth reference plane D, the first pressure plate 11 descends, the third pressure plate 21 rises and lifts up the conveyor belt 31, and at the same time the buffer mechanism 40 releases the conveyor belt 31 stored in itself to avoid a sudden increase in the tension of the conveyor belt 31.

[0136] When the battery cell forming device 100 switches from the second position to the third position, the first pressing plate 11 and the third pressing plate 21 both descend, and the lifted conveyor belt 31 is released. Meanwhile, the buffer mechanism 40 stores the conveyor belt 31 to tighten the conveyor belt 31 and prevent the conveyor belt 31 from loosening.

[0137] In this embodiment, a conveying mechanism 30 is provided to convey the pre-pressed battery cells 300, which is conducive to realizing the automated production of the battery cells 300. A buffer mechanism 40 is connected to the conveyor belt 31 to prevent a sudden increase or relaxation of the tension of the conveyor belt 31 when the battery cell forming device 100 switches positions, so as to maintain the stability of the conveyor belt 31.

[0138] According to some other embodiments of the present invention, the buffer mechanism 40 includes a movable wheel 41 and a driving member 42. The movable wheel 41 abuts against the conveyor belt 31 and is movable in its radial direction to store or release the conveyor belt 31, and the driving member 42 is connected to the movable wheel 41 and drives the movable wheel 41 to move in its radial direction.

[0139] In other words, the buffer mechanism 40 can be mainly composed of a movable wheel 41 and a driving member 42, wherein the driving member 42 can include but is not limited to a motor and a hydraulic cylinder. The driving member 42 can have a telescopic end, which can be connected to the movable wheel 41 and drive the movable wheel 41 to move along its own radial direction. The conveyor belt 31 can be tensioned on the conveyor wheel 32 to form an upper and lower two-layer structure.

[0140] like Figures 9 to 12 As shown, the movable wheel 41 can abut against the conveyor belt 31 of the lower layer and form a triangular arrangement with the two conveyor wheels 32. The telescopic end of the driving member 42 can move along the first direction. When the driving member 42 drives the movable wheel 41 to move to the left, the buffer mechanism 40 can release the conveyor belt 31, and when the driving member 42 drives the movable wheel 41 to move to the right, the buffer mechanism 40 can buffer the conveyor belt 31.

[0141] When the cell forming device 100 switches from the first position to the second position, the driving member 42 can drive the movable wheel 41 to move leftward. When the cell forming device 100 switches from the second position to the third position, the driving member 42 can drive the movable wheel 41 to move rightward.

[0142] In this embodiment, the cache mechanism 40 composed of the movable wheel 41 and the driving member 42 has a simple structure and high reliability. The movable wheel 41 and the first pressure plate 11, the second pressure plate 12, the third pressure plate 21 and the fourth pressure plate 22 can be linked by the electronic control system, so that the conveyor belt 31 is always tensioned on the conveyor wheel 32 with appropriate tension to avoid the conveyor belt 31 being too tight or too loose.

[0143] The embodiment of the utility model further provides a winding machine, which comprises the battery core forming device 100 according to any of the above embodiments and a clamping needle assembly 200. The clamping needle assembly 200 can be used to clamp the battery core 300.

[0144] Specifically, the winding machine may include a plurality of clamping needle assemblies 200, two of the plurality of clamping needle assemblies 200 may be spaced apart along a first direction and used to cut the battery cell 300, and the distance between the two clamping needle assemblies 200 is adjustable, so that before the battery cell forming device 100 pre-presses the battery cell 300, the two clamping needle assemblies 200 may flatten the battery cell 300.

[0145] Each clamping needle assembly 200 can be composed of an inner clamping needle 201 and an outer clamping needle 202. The inner clamping needle 201 can extend into the inner circle of the battery cell 300 and abut against the inner wall surface of the battery cell 300, and the outer clamping needle 202 can abut against the outer peripheral surface of the battery cell 300.

[0146] Since the battery cell forming device 100 according to the embodiment of the utility model has the above-mentioned technical effects, the winding machine according to the embodiment of the utility model also has the corresponding technical effects, that is, it can avoid the loosening of the inner circle of the battery cell 300 and reduce the gap between the pole pieces and between the pole pieces and the diaphragm, which is beneficial to improve the quality of the pre-pressing of the battery cell 300 and improve the performance of the battery cell 300.

[0147] Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A battery core forming device, characterized in that: include: A first pressing assembly, the first pressing assembly comprising a first pressing plate and two second pressing plates, the first pressing plate extending along a first direction, the two second pressing plates being spaced apart along the first direction and disposed at two ends of the first pressing plate; a second pressing assembly, wherein the second pressing assembly is spaced apart from the first pressing assembly in a second direction to form an accommodating space suitable for accommodating a battery cell, and the second direction intersects the first direction; A driving assembly is used to drive at least two of the first pressing plate, the second pressing plate and the second pressing assembly to move along the second direction.

2. The battery core forming device according to claim 1, characterized in that: The drive assembly comprises: A first driving mechanism and a second driving mechanism, wherein the first driving mechanism is used to drive the first pressing plate to move along the second direction, and the second driving mechanism is used to drive the second pressing plate to move along the second direction.

3. The battery core forming device according to claim 1, characterized in that: The cell forming device is switchable between a first state, a second state and a third state. When the battery cell forming device is in the first state, one of the first pressing assembly and the second pressing assembly abuts against the battery cell, and the other is spaced apart from the battery cell; When the battery core forming device is in the second state, the first pressing plate and the second pressing assembly clamp the middle of the battery core, and the two second pressing plates are spaced apart from the battery core; When the battery cell forming device is in the third state, the first pressing plate and the second pressing assembly clamp the middle of the battery cell, and the two second pressing plates and the second pressing assembly clamp both ends of the battery cell.

4. The battery core forming device according to claim 1 or 3, characterized in that: A side surface of the second pressing assembly facing the first pressing assembly is formed as a first reference surface, and the first pressing plate and the two second pressing plates are movable along the second direction relative to the first reference surface.

5. The battery core forming device according to claim 1 or 3, characterized in that: A side surface of the first pressing plate facing the second pressing assembly is formed as a second reference surface, and the second pressing assembly and the two second pressing plates are movable along the second direction relative to the second reference surface.

6. The battery core forming device according to claim 1, characterized in that: The second pressing assembly comprises: a third pressing plate, the third pressing plate being arranged opposite to the first pressing plate and extending along the first direction; Two fourth pressing plates, the two fourth pressing plates are arranged in one-to-one correspondence with the two second pressing plates, the two fourth pressing plates are spaced apart along the first direction and are arranged at two ends of the third pressing plate; The driving assembly is used to drive the third pressing plate to move along the second direction.

7. The battery core forming device according to claim 6, characterized in that: The battery core forming device is switchable between a first position, a second position and a third position. When the battery core forming device is in the first position, one of the first pressing assembly and the second pressing assembly abuts against the battery core, and the other is spaced apart from the battery core; When the battery core forming device is in the second position, the first pressing plate and the third pressing plate clamp the middle part of the battery core, and the second pressing plate and the fourth pressing plate are respectively separated from the battery core; When the battery core forming device is in the third position, the first pressing plate and the third pressing plate clamp the middle of the battery core, and the two second pressing plates and the two fourth pressing plates clamp both ends of the battery core.

8. The battery core forming device according to claim 7, characterized in that: The center plane of the battery cell in the second direction is formed as a fourth reference plane, and the first pressing plate, the two second pressing plates, the third pressing plate and the two fourth pressing plates are movable along the second direction relative to the fourth reference plane.

9. The battery core forming device according to claim 7, characterized in that: A side surface of the fourth pressing plate facing the first pressing assembly is formed as a fifth reference surface, and the first pressing plate, the two second pressing plates and the third pressing plate are movable along the second direction relative to the fifth reference surface.

10. The battery core forming device according to claim 8, characterized in that: The distance between the first pressing plate and the fourth reference plane is L1, the distance between the second pressing plate and the fourth reference plane is L2, the distance between the third pressing plate and the fourth reference plane is L3, and the distance between the fourth pressing plate and the fourth reference plane is L4. When the battery cell forming device is in the second position and the third position, L1=L3, and when the battery cell forming device is in the third position, L2=L4.

11. The battery core forming device according to claim 7, characterized in that: Also includes: A conveying mechanism, the conveying mechanism comprising a conveying belt, the conveying belt conveys the battery cell along the first direction, at least a portion of the conveying belt is disposed between the first pressing assembly and the second pressing assembly; A cache mechanism, the cache mechanism is connected to the conveyor belt and is used to store or release the conveyor belt; When the battery core forming device is in the first position or the third position, the buffer mechanism stores the conveyor belt; When the battery core forming device is in the second position, the buffer mechanism releases the conveyor belt.

12. The battery core forming device according to claim 11, characterized in that: The cache mechanism comprises: A movable wheel, the movable wheel abuts against the conveyor belt and is movable in its radial direction to store or release the conveyor belt; A driving member is connected to the movable wheel and drives the movable wheel to move in its radial direction.

13. A winding machine, characterized in that: include: A battery cell forming device, wherein the battery cell forming device is the battery cell forming device according to any one of claims 1 to 12; A clamping needle assembly is used to clamp the battery core.

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