Laminated cell leveling device

Abstract

The utility model belongs to the technical field of lithium battery production, and discloses a laminated cell flattening device which comprises a flattening assembly, a connecting plate, a driving piece, a pressure sensor and a controller, the flattening assembly comprises a movable plate, a bottom plate and a pressing plate, a laminated cell is placed on the bottom plate, the movable plate can be close to or far away from the bottom plate to flatten or separate from the laminated cell, and the pressing plate is connected with the connecting plate. The connecting plate and the movable plate are oppositely arranged, the driving part drives the connecting plate to drive the movable plate to be close to or away from the bottom plate, the pressure sensor can detect the pressure applied to the movable plate by the connecting plate, and the controller can receive a pressure signal of the pressure sensor and adjust the magnitude and duration of the output pressure of the driving part; according to the utility model, the same pressure applied to the laminated battery cell can be ensured to reach a preset pressure value, the compaction time length of the laminated battery cell can be ensured to reach a preset time length, and the consistency of process parameters is improved, so that the quality and the performance of the laminated battery cell are ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery production, in particular to a stacked battery core flattening device. Background Art

[0002] The production methods of lithium-ion cells are mainly divided into two types: winding and stacking. Compared with winding, lithium-ion cells produced by stacking have higher energy density and better quality. Stacked cells are alternately stacked with positive electrode sheets, separators and negative electrode sheets. Among them, the separator is a specially formed polymer film with a microporous structure that allows lithium ions to pass freely, but electrons cannot pass. During the charging and discharging process, Li ions are embedded and de-embedded back and forth between the two electrodes: during charging, Li ions are de-embedded from the positive electrode, embedded in the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state. During discharging, the opposite is true. Li ions are de-embedded from the negative electrode, embedded in the positive electrode through the electrolyte, and the positive electrode is in a lithium-rich state.

[0003] The flatness of lithium-ion battery cells produced by stacking is particularly important. If the stacked battery cells are not flat enough, it will affect their charging and discharging performance. Therefore, before the stacked battery cells are installed in the battery casing, they need to be flattened and compacted to a certain extent to ensure the quality and performance of the lithium battery. However, existing devices cannot guarantee the consistency of process parameters. For example, it is impossible to ensure that the same pressure is applied to the stacked battery cells and the compaction time is long, and thus the quality and performance of the lithium battery cannot be ensured.

[0004] Therefore, a device is urgently needed to solve the above problems. Utility Model Content

[0005] The utility model aims to provide a laminated battery core flattening device, which can ensure that the same pressure is applied to the laminated battery core and the compaction time is long, thereby ensuring the quality and performance of the laminated battery core.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] The stacked cell flattening device comprises:

[0008] A flattening assembly, the flattening assembly comprising a movable plate, a bottom plate and a pressure plate, the movable plate being arranged opposite to the bottom plate, the pressure plate being arranged at the bottom of the movable plate, the bottom plate being used for placing laminated cells, the movable plate being able to approach or move away from the bottom plate so that the pressure plate can flatten or detach from the laminated cells;

[0009] A connecting plate, the connecting plate is arranged above the movable plate, and the connecting plate and the movable plate are arranged opposite to each other;

[0010] A driving member, wherein the driving member is configured to drive the connecting plate to drive the movable plate to move closer to or away from the bottom plate;

[0011] A pressure sensor, the pressure sensor is installed on the top of the movable plate and located below the connecting plate;

[0012] A controller is electrically connected to the driving member and is configured to adjust the magnitude and duration of the output pressure of the driving member. The controller is electrically connected to the pressure sensor and is configured to receive a pressure signal from the pressure sensor.

[0013] Preferably, a buffer assembly is further included, wherein the buffer assembly includes an elastic member, and the elastic member is connected between the connecting plate and the movable plate.

[0014] Preferably, the buffer assembly also includes a guide member, which includes a connecting portion and a boss portion, the bottom of the connecting portion is connected to the movable plate, the top of the connecting portion is movably inserted into the connecting plate and connected to the boss portion, and the elastic member is sleeved on the connecting portion.

[0015] Preferably, the stacked battery cell flattening device also includes a support platform, which is fixed above the connecting plate, and the driving member is installed on the support platform, the output end of the driving member is connected to one end of a piston rod, and the other end of the piston rod is movably passed through the support platform and connected to the connecting plate.

[0016] Preferably, the stacked battery cell flattening device further comprises a guide column, one end of which is connected to the support platform, and the other end of which is movably inserted through the movable plate and connected to the bottom plate.

[0017] Preferably, the stacked battery cell flattening device further comprises a rolling bearing, the movable plate is provided with a connecting hole, the rolling bearing is fixedly connected to the hole wall of the connecting hole, and the guide column is movably provided through the rolling bearing.

[0018] Preferably, the piston rod and the guide column are both arranged perpendicular to the base plate.

[0019] Preferably, the flattening assembly further comprises a pad, which is arranged on the top of the bottom plate, and the laminated battery cell is placed on the pad.

[0020] Preferably, a non-metallic layer is provided at the bottom of the pressing plate and / or the top of the pad.

[0021] Preferably, the length of the pressing plate is not less than the length of the pad, and the width of the pressing plate is not less than the width of the pad.

[0022] Beneficial effect: The utility model provides a laminated battery cell flattening device, comprising: a flattening component, the flattening component comprises a movable plate, a bottom plate and a pressure plate, the movable plate is arranged opposite to the bottom plate, the pressure plate is arranged at the bottom of the movable plate, the bottom plate is used to place the laminated battery cell, the movable plate can be close to or away from the bottom plate to make the pressure plate flatten or detach from the laminated battery cell, a connecting plate, the connecting plate is arranged above the movable plate, the connecting plate is arranged opposite to the movable plate, a driving member, the driving member is configured to drive the connecting plate to drive the movable plate to approach or move away from the bottom plate, a pressure sensor, the pressure sensor is installed on the top of the movable plate and is located below the connecting plate, a controller, the controller is electrically connected to the driving member, and is configured to adjust the size and duration of the output pressure of the driving member, and the controller is electrically connected to the pressure sensor, and is configured to receive the pressure sensor The driving member can drive the connecting plate to move downward, and the connecting plate abuts against the sensing end of the pressure sensor, so as to prompt the movable plate and the pressure plate to move downward to flatten and compact the laminated battery cells on the bottom plate. The pressure sensor detects and feeds back the pressure signal in real time until the preset pressure value is reached, and starts timing to compact and flatten the laminated battery cells until the preset time is reached. The driving member drives the connecting plate to move upward, and the pressure sensor can detect in real time the size of the pressure applied by the connecting plate to the movable plate, that is, the size of the pressure applied to the laminated battery cells. When the pressure signal of the pressure sensor reaches the preset pressure value, the controller starts timing. After the preset time is reached, the controller controls the driving member to reset, thereby ensuring that the compaction time of the laminated battery cells reaches the preset time, improving the consistency of the process parameters, and thus ensuring the quality and performance of the laminated battery cells. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of a stacked battery cell flattening device provided in an embodiment of the utility model.

[0024] In the figure:

[0025] 100. Laminated battery cell; 11. Movable plate; 12. Bottom plate; 13. Pressing plate; 14. Pad; 21. Connecting plate; 22. Elastic member; 23. Guide member; 3. Driving member; 4. Pressure sensor; 5. Support platform; 6. Piston rod; 7. Guide column; 8. Rolling bearing; 9. Controller. DETAILED DESCRIPTION

[0026] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0027] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0029] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0030] The present embodiment provides a stacked battery cell flattening device. On the one hand, through semi-automatic operation, it can be used for compacting and flattening stacked battery cells, and has a simple structure, convenient operation, and low maintenance cost. On the other hand, it can set the pressure size and pressing time to ensure that the same pressure and compaction time are applied to the stacked battery cells, thereby improving the consistency of process parameters and ensuring the quality and performance of the stacked battery cells.

[0031] See also Figure 1 The laminated battery cell flattening device includes a flattening component, and the flattening component includes a movable plate 11 and a bottom plate 12. Specifically, the movable plate 11 and the bottom plate 12 are arranged opposite to each other, and the laminated battery cells 100 are placed on the bottom plate 12 at intervals. The movable plate 11 is controlled to approach or move away from the bottom plate 12 to flatten or separate the laminated battery cells 100, so as to press the laminated battery cells 100, and the laminated battery cells 100 can be smoothly taken out after the pressing is completed.

[0032] Furthermore, the flattening assembly further includes a pressing plate 13, which is disposed at the bottom of the movable plate 11 and is used to compress the laminated battery cells 100. The flattening assembly further includes a pad 14, which is disposed at the top of the bottom plate 12, and a plurality of laminated battery cells 100 are placed on the pad 14 at intervals, and is used to provide support force for the laminated battery cells 100 during the compaction process. Preferably, the length of the pressing plate 13 is not less than the length of the pad 14, and the width of the pressing plate 13 is not less than the width of the pad 14, so as to ensure that the plurality of laminated battery cells 100 placed on the pad 14 can be pressed without omission, thereby improving reliability.

[0033] Further preferably, the bottom of the pressing plate 13 and the top of the pad 14 are both flat and free of burrs, and the bottom of the pressing plate 13 and / or the top of the pad 14 are both provided with a non-metallic layer, such as Saigang. In other feasible embodiments, the pressing plate 13 and the pad 14 can also be directly made of non-metallic materials with higher hardness.

[0034] This embodiment further includes a connecting plate 21 . The connecting plate 21 is disposed above the movable plate 11 . The connecting plate 21 and the movable plate 11 are disposed opposite to each other and are used to apply pressure to the movable plate 11 .

[0035] The stacked cell flattening device also includes a buffer assembly, which prevents the pressing plate 13 from hard collision with the top surface of the stacked cell and damages the stacked cell when the pressing plate 13 presses down the stacked cell. Specifically, the buffer assembly is arranged above the movable plate 11, and the buffer assembly includes an elastic member 22, and the elastic member 22 is connected between the connecting plate 21 and the movable plate 11. Preferably, a plurality of elastic members 22 are arranged at intervals, and the plurality of elastic members 22 are evenly distributed below the connecting plate 21, so as to ensure that the connecting plate 21 does not deviate and flip during the downward movement.

[0036] Preferably, the elastic member 22 is a spring.

[0037] Further, the buffer assembly also includes a guide member 23. Specifically, the guide member 23 includes a connecting portion and a boss portion, wherein the top of the connecting portion is movably inserted into the connecting plate 21 and connected to the boss portion, the bottom of the connecting portion is connected to the movable plate 11, and the elastic member 22 is sleeved on the connecting portion. By setting the connecting portion, the upward or downward movement of the connecting plate 21 can be guided, and by setting the boss portion, the connecting plate 21 can be prevented from being separated from the guide of the connecting portion.

[0038] Preferably, there are a plurality of guide members 23, and the plurality of guide members 23 correspond to a plurality of elastic members 22 one by one, and the elastic members 22 are sleeved on the connecting parts of the corresponding guide members 23. Further preferably, the connecting parts of the guide members 23 are arranged perpendicular to the pad 14, so as to ensure that the downward movement direction of the connecting plate 21 is perpendicular to the pad 14.

[0039] The laminated battery cell flattening device also includes a driving member 3, which can drive the connecting plate 21 to move downward, thereby driving the movable plate 11 and the pressing plate 13 to move downward close to the bottom plate 12, so that the pressing plate 13 is close to the pad 14. When the pressing plate 13 abuts against the pad 14, the elastic member 22 is compressed, and the connecting plate 21 continues to move downward relative to the movable plate 11, exerting pressure on the movable plate 11 and the pressing plate 13, thereby pressing the laminated battery cell 100. After the pressing operation is completed, the driving member 3 drives the connecting plate 21 to move upward, thereby driving the movable plate 11 and the pressing plate 13 to move upward, and at this time, the laminated battery cell 100 can also be taken out to complete the operation.

[0040] Furthermore, the present embodiment is also provided with a pressure sensor 4. Specifically, the pressure sensor 4 is installed on the top of the movable plate 11 and is located below the connecting plate 21. During the pressing process, after the pressing plate 13 abuts against the pad 14, the connecting plate 21 continues to move downward relative to the movable plate 11. At this time, the connecting plate 21 abuts against the sensing end of the pressure sensor 4. The pressure sensor 4 can detect in real time the magnitude of the pressure applied by the connecting plate 21 to the movable plate 11 and the pressing plate 13, that is, the magnitude of the pressure applied to the laminated battery cell 100. In the present embodiment, the connecting plate 21 is elastically connected to the movable plate 11 through a buffer assembly to prevent the connecting plate 21 from being pressed down at a high speed during the pressing process, and preventing the connecting plate 21 from having a hard collision with the top surface of the pressure sensor 4 and damaging the pressure sensor 4.

[0041] Preferably, the stacked battery cell flattening device also includes a support platform 5, which is fixed above the connecting plate 21, and a driving member 3 is installed on the support platform 5. The output end of the driving member 3 is connected to one end of a piston rod 6. The driving member 3 is used to push the piston rod 6 to move down or up in a straight line. The other end of the piston rod 6 movably passes through the support platform and is connected to the connecting plate 21, thereby driving the connecting plate 21 to move down or up.

[0042] Optionally, the driving member 3 is a servo electric cylinder, a servo air cylinder, a linear motor, etc.

[0043] Preferably, the piston rod 6 is arranged perpendicular to the bottom plate 12, thereby ensuring that the force direction of the piston rod 6 is perpendicular to the bottom plate 12. Further preferably, the support platform 5 and the connecting plate 21 are arranged opposite to each other, so as to ensure that the connecting plate 21 moves downward or upward along the axial direction of the piston rod 6.

[0044] Furthermore, the stacked cell flattening device further comprises guide pillars 7, a plurality of guide pillars 7 are arranged at intervals, one end of each guide pillar 7 is connected to the support platform 5, and the other end is movably arranged on the movable plate 11 and connected to the bottom plate 12 to support the support platform 5. Figure 1 The size of the pressing plate 13 is smaller than that of the movable plate 11 , and the guide column 7 is movably arranged in the movable plate 11 , thereby guiding the movable plate 11 to move downward or upward.

[0045] Preferably, the guide column 7 is arranged perpendicular to the bottom plate 12. Since the bottom plate 12 is opposite to the movable plate 11 and the movable plate 11 is opposite to the support platform 5, the guide column 7 is also perpendicular to the movable plate 11 and the support platform 5 to ensure that the pressure direction of the movable plate 11 and the pressure plate 13 is perpendicular to the bottom plate 12, thereby ensuring uniform pressure on the multiple laminated battery cells 100 on the bottom plate 12.

[0046] In this embodiment, four guide pillars 7 are arranged at intervals, and the four guide pillars 7 are movably arranged at four corners of the movable plate 11. In other feasible embodiments, other numbers of guide pillars 7 may be arranged, which is not specifically limited here.

[0047] Furthermore, the movable plate 11 is provided with a connecting hole, and the laminated battery cell flattening device also includes a rolling bearing 8, which is fixedly connected to the hole wall of the connecting hole, and the guide column 7 is movably arranged through the rolling bearing 8, thereby improving the smoothness of the sliding of the movable plate 11 along the guide column 7.

[0048] Preferably, the movable plate 11 is provided with a plurality of connection holes, the laminated cell flattening device includes a plurality of rolling bearings 8, the plurality of connection holes correspond one to one with the plurality of rolling bearings 8, and the guide pillars 7 are movably provided through the corresponding rolling bearings 8.

[0049] The stacked battery cell flattening device provided in this embodiment also includes a controller 9, which is electrically connected to the driving member 3 and is configured to adjust the output pressure. The controller 9 is also electrically connected to the pressure sensor 4 and is configured to receive the pressure signal sensed by the sensing end of the pressure sensor 4. The controller 9 can set the pressure value output by the driving member 3 through the pressure signal fed back by the pressure sensor 4 to ensure that the force applied to the stacked battery cell 100 reaches a preset pressure value.

[0050] Furthermore, by presetting the logic in the controller 9, when the pressure signal of the pressure sensor 4 reaches the preset pressure value, the timing starts. After the preset time is reached, the controller 9 controls the driving component 3 to reset, thereby ensuring that the compaction time of the stacked battery cell 100 reaches the preset time.

[0051] This embodiment can ensure that the same pressure is applied to the laminated battery cells 100 and reaches a preset pressure value by setting the controller 9, and can also ensure that the compaction time of the laminated battery cells 100 reaches a preset time, thereby improving the consistency of process parameters and ensuring the quality and performance of the laminated battery cells 100.

[0052] Preferably, the controller 9 is a PLC electrical control box, which is a common device in the prior art, and its specific structure will not be described in detail here.

[0053] The pressing process of the stacked cell flattening device provided in this embodiment specifically includes:

[0054] The operator places the laminated battery cells 100 to be pressed at intervals on the pad 14, inputs the preset pressure value and preset time in the controller 9 in advance according to the process requirements, sets the logic, starts the driving member 3, and the driving member 3 pushes the piston rod 6 to move linearly downward, driving the connecting plate 21 to move downward until the connecting plate 21 abuts against the sensing end of the pressure sensor 4, prompting the movable plate 11 and the pressing plate 13 to move downward to flatten and compact the laminated battery cells 100. The pressure sensor 4 detects and feeds back the pressure signal in real time until the preset pressure value is reached, starts timing, compacts and flattens the laminated battery cells 100, and reaches the preset time. The driving member 3 pushes the piston rod 6 to move linearly upward, driving the connecting plate 21 to move upward. When the boss abuts against the connecting plate 21, it drives the movable plate 11 and the pressing plate 13 to move upward. At this time, the operator can remove the laminated battery cells 100 to complete the pressing operation.

[0055] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A stacked cell flattening device, characterized in that: include: A flattening assembly, the flattening assembly comprising a movable plate (11), a bottom plate (12) and a pressing plate (13), the movable plate (11) being arranged opposite to the bottom plate (12), the pressing plate (13) being arranged at the bottom of the movable plate (11), the bottom plate (12) being used for placing a laminated battery core (100), and the movable plate (11) being able to approach or move away from the bottom plate (12) so that the pressing plate (13) flattens or detaches from the laminated battery core (100); A connecting plate (21), the connecting plate (21) being arranged above the movable plate (11), the connecting plate (21) and being arranged opposite to the movable plate (11); A driving member (3), wherein the driving member (3) is configured to drive the connecting plate (21) to drive the movable plate (11) to move closer to or farther from the bottom plate (12); A pressure sensor (4), the pressure sensor (4) being mounted on the top of the movable plate (11) and located below the connecting plate (21); A controller (9), wherein the controller (9) is electrically connected to the driving member (3) and is configured to adjust the magnitude and duration of the pressure output by the driving member (3); and the controller (9) is electrically connected to the pressure sensor (4) and is configured to receive a pressure signal from the pressure sensor (4).

2. The stacked battery core flattening device according to claim 1, characterized in that: It also includes a buffer component, which includes an elastic member (22). The elastic member (22) is connected between the connecting plate (21) and the movable plate (11).

3. The stacked battery core flattening device according to claim 2, characterized in that: The buffer assembly also includes a guide member (23), the guide member (23) includes a connecting portion and a boss portion, the bottom of the connecting portion is connected to the movable plate (11), the top of the connecting portion is movably inserted into the connecting plate (21) and connected to the boss portion, and the elastic member (22) is sleeved on the connecting portion.

4. The stacked battery core flattening device according to claim 1, characterized in that: The stacked battery cell flattening device also includes a support platform (5), the support platform (5) is fixed above the connecting plate (21), the driving member (3) is installed on the support platform (5), the output end of the driving member (3) is connected to one end of a piston rod (6), and the other end of the piston rod (6) is movably passed through the support platform (5) and connected to the connecting plate (21).

5. The stacked cell flattening device according to claim 4, characterized in that: The stacked cell flattening device also includes a guide column (7), one end of which is connected to the support platform (5), and the other end of which is movably inserted into the movable plate (11) and connected to the bottom plate (12).

6. The stacked battery core flattening device according to claim 5, characterized in that: The stacked cell flattening device also includes a rolling bearing (8), the movable plate (11) is provided with a connecting hole, the rolling bearing (8) is fixedly connected to the hole wall of the connecting hole, and the guide column (7) is movably arranged on the rolling bearing (8).

7. The stacked battery core flattening device according to claim 5, characterized in that: The piston rod (6) and the guide column (7) are both arranged perpendicular to the bottom plate (12).

8. The stacked battery core flattening device according to any one of claims 1 to 7, characterized in that: The flattening assembly also includes a pad (14), the pad (14) being arranged on the top of the bottom plate (12), and the laminated battery core (100) being placed on the pad (14).

9. The stacked battery core flattening device according to claim 8, characterized in that: The bottom of the pressing plate (13) and / or the top of the pad (14) are both provided with a non-metallic layer.

10. The stacked battery core flattening device according to claim 8, characterized in that: The length of the pressing plate (13) is not less than the length of the pad (14), and the width of the pressing plate (13) is not less than the width of the pad (14).

Images