Lithium-coated pole piece winding and cooling device and use method thereof

Abstract

Disclosed are a lithium-coated pole piece winding and cooling device and a method for using the same. The lithium-coated pole piece winding and cooling device comprises: a support frame; a cooling roller assembly, comprising a large-diameter cooling roller with a diameter of more than 200 mm and a cooling roller support shaft coaxially arranged with the cooling roller; a winding device, comprising a winding device fixing plate, a winding shaft rotatably connected to one end of the fixing plate, a winding core sleeved on the winding shaft, a winding shaft driving element, and a winding device connecting hole rotatably connected to the cooling roller support shaft; a moving assembly, wherein the moving assembly comprises a fixed plate, a movable plate, and a driving element for driving the movable plate to move; the movable plate is fixedly connected to the support frame. The lithium-coated pole piece winding and cooling device of the present invention has the advantages of good cooling effect and simple operation because the lithium-coated pole piece is in direct contact with the cooling roller. It can effectively avoid the influence of excessive temperature rise on the performance of the lithium-coated pole piece, ensure the quality of the lithium-coated pole piece, and eliminate the potential safety hazards in the winding process of the lithium-coated pole piece.

Description

Technical Field

[0001] The present invention relates to the technical field of battery manufacturing, and in particular to a lithium-coated pole piece winding and cooling device and a use method thereof. Background Art

[0002] Lithium-ion batteries have become one of the most widely used secondary batteries due to their high specific energy, small size and long cycle life. However, with the continuous development of high-power and high-energy devices such as electronic devices and electric vehicles, the demand for lithium-ion battery energy density is increasing.

[0003] It has been proven that the energy density of lithium-ion batteries can be effectively improved by coating the pole piece with lithium. However, metallic lithium is an extremely active metal. It is very easy to react during and after the pole piece is coated with lithium, generating a large amount of heat and causing the temperature to be too high. On the one hand, the rise in temperature promotes further reaction of metallic lithium, reduces the content of active lithium in the lithium-coated negative electrode, and affects the quality of the pole piece; on the other hand, excessively high temperature may cause the pole piece to spontaneously combust.

[0004] Chinese patent application No. 201620904536.0 discloses a temperature control system for a pole piece winding structure, and the solution adopted is to directly use dry cold air to blow the side end face of the pole piece after winding for cooling. Patent application No. 201720845986.1 discloses a pole piece cooling system, which adopts a similar solution, using dry cold air to blow the side end face of the pole piece after winding, but the entire winding assembly is placed in a relatively closed cooling cabinet and equipped with an exhaust mechanism. Patent No. 201621139140.8 discloses a lithium-coated pole piece protection cold storage, and the solution adopted is to place the winding assembly in the cold storage, and pass dry cold air into the cold storage to cool the entire internal space of the cold storage. In the above-mentioned three schemes, dry cold air is used for cooling. Since the specific heat capacity of air is small and air can only cool the surface of the coil, the heat generated by the reaction of the lithium-coated pole piece inside the coil is difficult to dissipate, which will still cause the lithium-coated pole piece to react, and it is difficult to achieve an ideal cooling effect.

[0005] Patent application No. 201620904536.0 uses dry cold air to blow the coil directly, which may cause the lithium layer on the lithium-coated electrode to fall off and enter the eyes of the operator, posing a safety hazard. Patent application No. 201720845986.1 and Patent application No. 201621139140.8 enclose the winding device, which increases the complexity of operation, and the rapid flow of air in the box can easily wrinkle the pole ear. Therefore, there is an urgent need for a simple, safe and reliable lithium-coated electrode winding and cooling device. Summary of the invention

[0006] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a new lithium-coated electrode sheet winding and cooling device which is simple to operate, safe and reliable.

[0007] The purpose of the present invention can be achieved through the following technical solutions.

[0008] The present invention provides a lithium-coated electrode sheet winding and cooling device, comprising:

[0009] Support frame;

[0010] A cooling roller assembly, the cooling roller assembly comprising a large-diameter cooling roller with a diameter of 200 mm or more and a cooling roller support shaft arranged coaxially with the cooling roller, the cooling roller being rotatably connected to the support frame via the cooling roller support shaft;

[0011] A winding device, the winding device comprising a winding device fixing plate, a winding shaft rotatably connected to one end of the winding device fixing plate, a winding core sleeved on the winding shaft, a winding shaft driving element capable of driving the winding shaft to rotate along its own axis, and a winding device connecting hole rotatably connected to the cooling roller support shaft, wherein the winding device can rotate around the axis of the cooling roller so that the winding shaft can revolve around the cooling roller, i.e., rotate and move along the outer peripheral surface of the cooling roller;

[0012] A movable assembly, the movable assembly comprising a fixed plate, a movable plate movably connected to the fixed plate through a guide element, and a driving element for driving the movable plate to move; the movable plate is fixedly connected to the support frame, and the movement of the movable plate can drive the cooling roller and the winding device to move along the axis direction of the cooling roller.

[0013] In some embodiments, there is only one winding device. The lithium-coated electrode sheet is directly wound onto the cooling roller for winding. After cooling, the lithium-coated electrode sheet is wound onto the winding core of the winding device, and the winding core is driven by the winding shaft to rewind the lithium-coated electrode sheet from the cooling roller onto the winding core.

[0014] In some embodiments, there may be two sets of winding devices. When the lithium-coated electrode sheet is wound onto one side of the cooling roller for winding, the lithium-coated electrode sheet on the other side of the cooling roller can be wound onto the winding core of the winding device, and the winding core is driven by the winding shaft to rewind the lithium-coated electrode sheet from the cooling roller onto the winding core. To achieve this operation, it is necessary to ensure that the angular velocity of the winding device is greater than the angular velocity of the cooling roller.

[0015] Optionally, the diameter of the cooling roller is calculated based on the thickness of the lithium-coated electrode sheet, the length of the lithium-coated electrode sheet to be rolled up, and the thickness of the lithium-coated electrode sheet on the cooling roller after rolling up.

[0016] Optionally, the cooling roller assembly and the winding device each include a transmission unit, preferably a synchronous transmission unit.

[0017] Optionally, a temperature sensor is installed near the cooling roller to measure the temperature of the lithium electrode covering the cooling roller.

[0018] Optionally, multiple rolls of lithium-coated electrodes can be wound around the cooling roller.

[0019] Optionally, the lithium-coated pole sheet winding and cooling device further includes a deviation correction mechanism, which is arranged in front of the cooling roller and is used to correct the deviation of the lithium-coated pole sheet when the cooling roller is wound.

[0020] Optionally, the lithium-coated pole sheet winding and cooling device further includes a tension control mechanism for controlling the tension of the cooling roller when winding the lithium-coated pole sheet.

[0021] Optionally, a support roller is provided at the winding position of the cooling roller, and the lithium-coated electrode sheet is wound after passing through the support roller.

[0022] The present invention also provides a method for using the above-mentioned lithium-coated pole piece winding and cooling device, comprising:

[0023] The lithium-coated pole piece winding and cooling device is arranged downstream of the pole piece lithium-coating equipment;

[0024] The winding position of the cooling roller in the cooling roller assembly is set to be aligned with the lithium-coated pole piece from the pole piece lithium-coating equipment, and the lithium-coated pole piece is wound onto the cooling roller at the same winding speed as the pole piece lithium-coating equipment for contact cooling;

[0025] After the above-mentioned contact cooling, the cooled lithium-coated electrode sheet is wound onto the winding core of the winding device.

[0026] Optionally, the diameter of the cooling roller is set so that when the lithium-coated electrode sheet of a required length is completely rolled up on the cooling roller, the total thickness of the lithium-coated electrode sheet wound on the cooling roller does not exceed 30 mm.

[0027] Optionally, the thickness of the lithium-coated electrode sheet on the cooling roller after winding is calculated based on factors including the heat generated by the reaction between the electrode sheet material and lithium, the winding speed, and the heat capacity and flow rate of the refrigerant.

[0028] Optionally, the winding device is two sets of winding devices respectively arranged on the inner and outer sides of the cooling roller, wherein when the lithium-coated electrode sheet is wound onto one side of the cooling roller for winding, the winding device and the winding shaft on the other side are driven to rotate, so that the rotation angular velocity of the winding device is greater than the rotation angular velocity of the cooling roller, and the cooled lithium-coated electrode sheet located on the other side of the cooling roller is wound onto the winding core of the winding device.

[0029] In the lithium-coated pole piece winding cooling device and method provided by the present invention, the cooling roller always maintains a relatively low temperature, and the lithium-coated pole piece is continuously cooled by contact conduction; whether the lithium-coated pole piece is in the process of winding to the cooling roller, winding is completed, or rewinding from the cooling roller to the winding core, as long as the pole piece is in contact with the cooling roller, the lithium-coated pole piece is continuously cooled. Therefore, the pole piece after winding by the device of the present invention maintains a relatively low temperature, effectively avoiding the safety hazards caused by excessive temperature rise, and effectively improving the quality of the pole piece.

[0030] Moreover, the cooling is carried out by heat conduction, without the influence of airflow, which will not cause wrinkles on the pole ears of the lithium-coated pole piece and will not affect the normal operation of the operator. In addition, the cooling roller assembly and the winding device do not need to be closed, which is simple to operate and highly efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a front view of an embodiment of the present invention.

[0032] Figure 2 yes Figure 1 Top view of the illustrated embodiment.

[0033] Figure 3 yes Figure 1 Axle-side view of the implementation scheme described in the figure after removing the tension control mechanism and the deviation correction mechanism.

[0034] Figure 4 yes Figure 1 Schematic diagram of the winding device in the implementation scheme.

[0035] Description of the figure number:

[0036] P Lithium-coated pole piece 1 Support frame 2 Cooling roller assembly 21 Cooling roller support shaft

[0037] 22 synchronous pulley 23 cooling roller 24 rotary joint 25 speed reducer

[0038] 26 Motor 3 Rewinding device 3A Inner rewinding device 3B Outer rewinding device

[0039] 31 rewinding device fixing plate 32 rewinding shaft 33 reel core 34 rewinding shaft motor

[0040] 35 motor mounting frame 36 winding device motor 37 synchronous pulley 38 synchronous belt

[0041] 39 winding device connection hole 4 moving component 41 fixing plate 42 guiding element

[0042] 43 linear drive element 44 movable plate 5 temperature sensor 6 support roller

[0043] 7 Correction mechanism 8 Tension control mechanism 9 Pole piece composite equipment DETAILED DESCRIPTION

[0044] The specific embodiments of the present invention are described below. It should be understood that those skilled in the art can conceive of other various embodiments and can modify them according to the teachings of this disclosure without departing from the scope or spirit of the present invention. Therefore, the following specific embodiments are not intended to be limiting.

[0045] In the description of the present invention, it should be understood that the terms "inside", "outside", etc. are only for the convenience of description and therefore should not be construed as limiting the present invention.

[0046] The specific embodiment of the equipment for winding and cooling lithium-coated electrode sheets is described in detail below in conjunction with the accompanying drawings.

[0047] refer to Figures 1 to 4 The lithium-coated electrode sheet winding and cooling device of the present invention comprises:

[0048] A cooling roller assembly 2, wherein the cooling roller 23 in the cooling roller assembly 2 has a function of maintaining a low temperature;

[0049] A winding device 3, the winding device 3 can rotate around the cooling roller 23, the winding device 3 includes a winding shaft 32, a winding core 33, a winding shaft motor 34, etc., wherein the winding shaft 32 has the function of rotating along its own axis, and the winding core 33 is sleeved on the winding shaft 32;

[0050] A support frame 1, wherein the support frame 1 is used to support and install a cooling roller assembly 2 and a winding device 3;

[0051] The movable component 4 includes a fixed plate 41, a guide element 42, a linear drive element 43 and a movable plate 44; the movable plate 44 in the movable component 4 is fixedly connected to the support frame 1, and the movement of the movable plate 44 can drive the cooling roller assembly 2 and the winding device 3 to move along the axial direction of the cooling roller 23.

[0052] refer to Figure 2 and Figure 3 The movable plate 44 in the movable assembly 4 is movably connected to the fixed plate 41 through the guide element 42. One end of the linear drive element 43 is hinged to the fixed plate 41, and the other end is hinged to the movable plate 44. The telescopic movement of the linear drive element 43 can drive the movement of the movable plate 44.

[0053] refer to Figure 4The winding device 3 includes a winding device fixing plate 31, a winding shaft 32, a winding core 33, a winding shaft motor 34, a motor mounting frame 35, a winding device motor 36, a synchronous pulley 37, a synchronous belt 38 and a winding device connecting hole 39. The winding shaft 32 is rotatably connected to one end of the winding device fixing plate 31, and the winding core 33 is sleeved on the winding shaft 32. The rotational movement of the winding shaft 32 is realized by the winding shaft motor 34, and the winding shaft motor 34 is fixedly connected to the winding device fixing plate 31 by the motor mounting frame 35. The winding device motor 36 is fixedly connected to the other end of the winding device fixing plate 31, and the synchronous pulley 37 is fixedly connected to the output shaft of the winding device motor 36. The rotational movement of the winding device motor 36 is transmitted to the winding device connecting hole 39 through the synchronous pulley 37 and the synchronous belt 38.

[0054] refer to Figure 3 The cooling roller assembly 2 includes a cooling roller support shaft 21, a synchronous pulley 22, a cooling roller 23, a rotary joint 24, a reducer 25 and a motor 26. The cooling roller support shaft 21 is coaxially fixedly connected to the cooling roller 23, and the cooling roller 23 is rotatably connected to the support frame 1 through the cooling roller support shaft 21. The synchronous pulley 22 is fixedly connected to the cooling roller support shaft 21 (by means of a key, spline, interference fit, friction, etc.). A rotary joint 24 is installed at one end of the cooling roller support shaft 21, and the rotary joint 24 is used to circulate a refrigerant to the cooling roller to keep the cooling roller 23 at a low temperature. The rotational movement of the cooling roller 23 is realized by the motor 26 and the reducer 25.

[0055] refer to Figure 3 and Figure 4 The winding device connection hole 39 is rotatably connected to the cooling roller support shaft 21, one end of the synchronous belt 38 on the winding device 3 is connected to the synchronous belt pulley 37 in the winding device 3, and the other end is connected to the synchronous belt pulley 22 in the cooling roller assembly 2. Therefore, the rotation of the motor 36 can drive the winding device 3 to rotate around the axis of the cooling roller 23.

[0056] The working process of the lithium-coated electrode winding and cooling device in this embodiment will be described in detail below.

[0057] refer to Figure 1 and Figure 2 The lithium-coated electrode P formed by the electrode and lithium strip (foil, powder) compounded by the electrode compounding device 9 passes through the tension control mechanism 8, the deviation correction mechanism 7, and the support roller 6 in sequence, and is wound onto the cooling roller 23 in a contact manner. Figure 2 The figure shows the working state of the lithium-coated electrode sheet P being wound inside the equipment. The cooling roller 23 rotates to realize the winding and cooling of the lithium-coated electrode sheet P. The temperature sensor 5 arranged near the cooling roller 23 is used to monitor the temperature of the lithium-coated electrode sheet P after winding. Figure 2In the working state, the newly compounded lithium-coated pole piece P is wound and rolled to the inner side of the cooling roller 23 (the direction in the figure is upward) for collection and cooling. If there is a cooled lithium-coated pole piece on the outer side of the cooling roller 23 (the direction in the figure is downward), the outer winding device 3B and the winding shaft 32 in the winding device 3B can be driven to rotate. As long as the rotation angular velocity of the winding device 3B is greater than the rotation angular velocity of the cooling roller 23, the lithium-coated pole piece can be rewound from the cooling roller 23 to the winding core 33 on the winding device 3B. Similarly, when the newly compounded lithium-coated pole piece P is wound and rolled to the outer side of the cooling roller 23 (the direction in the figure is downward), the lithium-coated pole piece on the inner side of the cooling roller 23 (the direction in the figure is upward) can be rewound to the winding core 33 on the inner winding device 3A at the same time.

[0058] Although the present invention has been disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

Claims

1. A lithium-coated electrode winding and cooling device, characterized in that: The lithium-coated electrode sheet winding and cooling device comprises: Support frame; A cooling roller assembly, the cooling roller assembly comprising a large-diameter cooling roller with a diameter of 200 mm or more and a cooling roller support shaft arranged coaxially with the cooling roller, the cooling roller being rotatably connected to the support frame via the cooling roller support shaft; A winding device, the winding device comprising a winding device fixing plate, a winding shaft rotatably connected to one end of the winding device fixing plate, a winding core sleeved on the winding shaft, a winding shaft driving element capable of driving the winding shaft to rotate along its own axis, and a winding device connecting hole rotatably connected to the cooling roller support shaft, wherein the winding device can rotate around the axis of the cooling roller so that the winding shaft can revolve around the cooling roller, i.e., rotate and move along the outer peripheral surface of the cooling roller; The movable assembly includes a fixed plate, a movable plate movably connected to the fixed plate through a guide element, and a driving element driving the movable plate to move; the movable plate is fixedly connected to the support frame, and the movement of the movable plate can drive the cooling roller and the winding device to move along the axis direction of the cooling roller. The winding device includes a winding device motor, a synchronous pulley, and a synchronous belt. The winding shaft is rotatably connected to one end of the winding device fixed plate. The winding device motor is fixedly connected to the other end of the winding device fixed plate. The output shaft of the winding device motor is fixedly connected to the synchronous pulley. The cooling roller assembly includes a synchronous pulley, which is fixedly connected to the cooling roller support shaft. One end of the synchronous belt on the winding device is connected to the synchronous pulley in the winding device, and the other end is connected to the synchronous pulley in the cooling roller assembly.

2. The lithium-coated electrode sheet winding and cooling device according to claim 1, characterized in that: The diameter of the cooling roller is calculated based on the thickness of the lithium-coated electrode sheet, the length of the lithium-coated electrode sheet to be rolled up, and the thickness of the lithium-coated electrode sheet on the cooling roller after rolling up.

3. The lithium-coated electrode sheet winding and cooling device according to claim 1, characterized in that: The cooling roller assembly and the winding device each include a transmission unit.

4. The lithium-coated electrode sheet winding and cooling device according to claim 1, characterized in that: The cooling roller assembly also includes a temperature sensor installed near the cooling roller.

5. The lithium-coated electrode sheet winding and cooling device according to claim 1, characterized in that: The lithium-coated electrode sheet passes through a tension control mechanism, or a deviation correction mechanism, or both a tension control mechanism and a deviation correction mechanism before being rolled onto a cooling roller.

6. The lithium-coated electrode sheet winding and cooling device according to claim 1, characterized in that: The winding device is one set of winding devices or two sets of winding devices respectively arranged on the inner side and the outer side of the cooling roller.

7. A method for using the lithium-coated electrode sheet winding and cooling device according to any one of claims 1 to 6, characterized in that: The method comprises: The lithium-coated pole piece winding and cooling device is arranged downstream of the pole piece lithium-coating equipment; The winding position of the cooling roller in the cooling roller assembly is set to be aligned with the lithium-coated pole piece from the pole piece lithium-coating equipment, and the lithium-coated pole piece is wound onto the cooling roller at the same winding speed as the pole piece lithium-coating equipment for contact cooling; After the above-mentioned contact cooling, the cooled lithium-coated electrode sheet is wound onto the winding core of the winding device.

8. The method according to claim 7, characterized in that The diameter of the cooling roller is set so that when the lithium-coated electrode sheet of the required length is completely rolled up on the cooling roller, the total thickness of the lithium-coated electrode sheet wound on the cooling roller does not exceed 30 mm.

9. The method according to claim 7, characterized in that The thickness of the lithium-coated electrode sheet on the cooling roller after winding is calculated based on factors including the heat generated by the reaction between the electrode sheet material and lithium, the winding speed, the heat capacity of the refrigerant, and the refrigerant flow rate.

10. The method according to claim 7, characterized in that The winding device comprises two sets of winding devices respectively arranged on the inner and outer sides of the cooling roller, wherein when the lithium-coated electrode sheet is wound onto one side of the cooling roller for winding, the winding device and the winding shaft on the other side are driven to rotate, so that the rotation angular velocity of the winding device is greater than the rotation angular velocity of the cooling roller, and the cooled lithium-coated electrode sheet on the other side of the cooling roller is wound onto the winding core of the winding device.

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