Lithium-coated pole piece winding and cooling method and device

Abstract

The present invention discloses a method and device for cooling the reeling of a lithium-coated pole piece. The method for cooling the reeling of a lithium-coated pole piece comprises: providing a cooling roller assembly and a reeling device, wherein the cooling roller assembly comprises one or more cooling rollers, each of which has a diameter of more than 200 mm, so that when all the lithium-coated pole pieces of the required length are reeled onto one cooling roller, the total thickness of the lithium-coated pole piece wound onto the cooling roller does not exceed 30 mm, and the reeling device comprises a reeling shaft and a winding core; setting a reeling position of a cooling roller to align with the lithium-coated pole piece from the pole piece lithium-coating device, and reeling the lithium-coated pole piece onto the cooling roller at the same speed as the pole piece lithium-coating device for contact cooling; and winding the contact-cooled lithium-coated pole piece onto the winding core. The present invention solves the problem of excessive temperature rise during the reeling of the lithium-coated pole piece, avoids the problem of pole piece quality degradation caused by excessive temperature rise, and eliminates the potential safety hazard of the pole piece burning due to excessive temperature rise.

Description

Technical Field

[0001] The present invention relates to the technical field of battery manufacturing, and in particular to a method and device for rolling and cooling a lithium-coated pole piece. 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 method and device for winding and cooling lithium-coated electrode sheets. Summary of the invention

[0006] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide a new method and device for winding and cooling lithium-coated pole pieces that are 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 method for winding and cooling a lithium-coated electrode sheet, comprising:

[0009] A cooling roller assembly and a winding device are provided downstream of the electrode lithium coating equipment, wherein

[0010] The cooling roller assembly includes one or more cooling rollers. When there are multiple cooling rollers, these cooling rollers are coaxially arranged and can be axially moved to switch positions. The diameter of each cooling roller is set to be more than 200 mm, so that when the lithium-coated electrode sheet of the required length is completely rolled up on one cooling roller, the total thickness of the lithium-coated electrode sheet wound on the cooling roller does not exceed 30 mm.

[0011] The winding device comprises a winding shaft and a winding core sleeved on the winding shaft, and is used to rewind the lithium-coated electrode sheet cooled by the cooling roller assembly onto the winding core;

[0012] The winding position of one 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;

[0013] After the above-mentioned contact cooling, and optionally after the position switching of the cooling roller, the cooled lithium-coated electrode sheet is wound onto a winding core.

[0014] 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.

[0015] If the thickness of the lithium-coated electrode sheet is δ, the length of the lithium-coated electrode sheet is L, and the maximum thickness of the lithium-coated electrode sheet on the cooling roller after winding is Δ, then the diameter D of the cooling roller is:

[0016]

[0017] Optionally, the thickness of the lithium-coated electrode on the cooling roller after winding is calculated based on factors such as the heat generated by the reaction between the electrode material and lithium, the winding speed, the heat capacity of the refrigerant, and the refrigerant flow rate.

[0018] Optionally, the temperature of the outermost side of the lithium-coated electrode sheet rolled up on the cooling roller does not exceed 30°C.

[0019] Optionally, a temperature sensor is installed near the cooling roller to measure the temperature of the lithium electrode covering the cooling roller.

[0020] Optionally, a deviation correction mechanism is provided when the cooling roller is wound up, and the deviation correction mechanism may be a process deviation correction mechanism or a winding deviation correction mechanism.

[0021] Optionally, a tension control mechanism is provided when the cooling roller is wound up, so as to control the tension when the cooling roller is winding up the lithium-coated electrode sheet.

[0022] Optionally, a correction mechanism is provided when the winding shaft rolls up the lithium-coated electrode sheet onto the winding core, and the correction mechanism may be a process correction mechanism or a winding correction mechanism.

[0023] Optionally, a tension control mechanism is provided when the reel reels the lithium-coated electrode sheet onto a reel core, so as to control the tension when the reel reels the lithium-coated electrode sheet.

[0024] In some embodiments, the number of the cooling rollers is 1. When the lithium-coated electrode sheet is wound and rolled onto the cooling roller for winding and cooling, the winding device is idle. After the electrode sheet is cooled to a preset temperature, the cooled lithium-coated electrode sheet is rewound onto the winding core of the winding shaft by the winding shaft. The cooling roller assembly and the winding device do not work at the same time.

[0025] In some embodiments, the number of cooling rollers is 2. The lithium-coated electrode sheet is wound onto the first cooling roller for winding, and after the first cooling roller is wound, the second cooling roller is used to continue winding the lithium-coated electrode sheet; while the second cooling roller is winding, the lithium-coated electrode sheet on the first cooling roller is optionally rewound onto the winding core on the winding shaft.

[0026] Optionally, the two cooling rollers can be driven to rotate separately, that is, the first cooling roller and the second cooling roller can rotate in different directions and at different rotation speeds.

[0027] Optionally, the two cooling rollers can use a reversing mechanism to switch the running direction. The first cooling roller and the second cooling roller can rotate in the same direction. After switching through the reversing mechanism, the first cooling roller and the second cooling roller can rotate in different directions, but the two cooling rollers rotate at a constant speed ratio.

[0028] In some embodiments, the number of the cooling rollers is multiple. When the lithium-coated electrode sheet is wound onto a cooling roller for winding, the lithium-coated electrode sheet on a cooling roller of the remaining cooling rollers can be rewound onto the winding core of the winding shaft, and the lithium-coated electrode sheets on the other cooling rollers are still kept in a cooling state, thereby ensuring the cooling time of the lithium-coated electrode sheet.

[0029] The present invention also provides a device for rolling and cooling a lithium-coated electrode, comprising:

[0030] A cooling roller assembly, comprising one or more cooling rollers with a diameter of 200 mm or more. When there are multiple cooling rollers, these cooling rollers are coaxially arranged and can be axially moved to switch positions, and one of the cooling rollers is used to roll up the lithium-coated pole sheet from the pole sheet lithium-coating equipment onto the cooling roller;

[0031] The winding device comprises a winding shaft and a winding core sleeved on the winding shaft, and is used for rewinding the lithium-coated electrode sheet cooled on the cooling roller onto the winding core.

[0032] Optionally, the cooling roller assembly includes a temperature sensor, which is arranged near the cooling roller and is used to measure the temperature of the lithium-coated electrode on the cooling roller.

[0033] Optionally, the cooling roller assembly includes a moving assembly, which can drive the cooling roller to move along the axial direction of the cooling roller so as to align the winding position of the cooling roller with the lithium-coated electrode sheet.

[0034] Optionally, the cooling roller assembly includes a deviation correction mechanism, which may be a process deviation correction mechanism or a winding deviation correction mechanism.

[0035] Optionally, the cooling roller assembly includes a tension control mechanism, and the tension control mechanism is used to control the tension of the cooling roller when winding the lithium-coated electrode sheet.

[0036] Optionally, the winding device includes a moving component, which can drive the winding shaft to move along the axial direction of the winding shaft so as to align the winding core with the lithium-coated electrode sheet to be rewound on the cooling roller.

[0037] Optionally, the winding device includes a deviation correction mechanism, which may be a process deviation correction mechanism or a winding deviation correction mechanism.

[0038] Optionally, the winding device includes a tension control mechanism for controlling the tension of the winding shaft when rewinding the lithium-coated electrode.

[0039] In some embodiments, the number of cooling rollers in the cooling roller assembly is one, and when the lithium-coated electrode sheet is wound onto the cooling roller for winding and cooling, the winding device is idle; after the lithium-coated electrode sheet on the cooling roller is cooled, the lithium-coated electrode sheet on the cooling roller is rewound onto the winding core of the winding device. The cooling roller assembly and the winding device are not operated at the same time.

[0040] In some embodiments, the number of cooling rollers in the cooling roller assembly is 2, and when the lithium-coated electrode sheet is wound on the first cooling roller for winding and cooling, the lithium-coated electrode sheet on the second cooling roller can be rewound onto the winding core of the winding device. The cooling roller assembly and the winding device can operate simultaneously, which does not affect the working efficiency of the electrode sheet lithium coating, and is more efficient.

[0041] Optionally, two cooling rollers in the cooling roller assembly are driven to rotate individually by driving elements, that is, the No. 1 cooling roller and the No. 2 cooling roller are driven by two driving elements respectively, and the two cooling rollers can work with different directions and different rotation speeds.

[0042] Optionally, the two cooling rollers are driven by one driving element, and a reversing mechanism is arranged between the two cooling rollers, wherein the reversing mechanism can make the two cooling rollers rotate in the same or opposite directions.

[0043] In some embodiments, the number of cooling rollers in the cooling roller assembly is multiple. When the lithium-coated electrode sheet is wound onto a cooling roller for winding, the lithium-coated electrode sheet on a cooling roller of the remaining cooling rollers can be rewound onto the winding core of the winding device, and the lithium-coated electrode sheets on the other cooling rollers are still kept in a cooling state, thereby ensuring the cooling time of the lithium-coated electrode sheet.

[0044] The technical solution of the present invention has at least one of the following advantages:

[0045] 1. Use heat conduction to cool down, without airflow influence, which will not cause wrinkles on the ears of the lithium-coated pole piece and will not affect the normal operation of the operator;

[0046] 2. The cooling roller assembly and winding device do not need to be closed, which is simple to operate and highly efficient;

[0047] 3. Use large diameter cooling roller or multiple cooling rollers for better cooling effect;

[0048] 4. The winding (rewinding) process of the winding device is not affected by other process steps, and the winding speed can be very fast, which can avoid the lithium-coated electrode from reacting and generating temperature rise during the winding process, thereby achieving faster winding and improving winding efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 is a simplified diagram of one embodiment of the present invention.

[0050] Figure 2 It is a schematic diagram of the cooling roller winding operation of the single cooling roller implementation scheme of the present invention.

[0051] Figure 3 It is a schematic diagram of the winding operation of the winding device of the single cooling roller implementation scheme of the present invention.

[0052] Figure 4 It is a front view of a multi-cooling roller implementation scheme in the present invention.

[0053] Figure 5 It is a schematic diagram of the working of winding the first cooling roller of the double cooling roller implementation scheme in the present invention.

[0054] Figure 6It is a schematic diagram of the working of winding the second cooling roller of the double cooling roller implementation scheme in the present invention.

[0055] Description of the figure number:

[0056] P pole piece P0 lithium strip (foil, powder) P1 lithium-coated pole piece P2 lithium-coated pole piece after cooling

[0057] Z Pole sheet lithium coating equipment A Cooling roller assembly B Winding device A1 Cooling roller

[0058] A11 No. 1 cooling roller A12 No. 2 cooling roller A2 temperature sensor A3 cooling roller winding support roller

[0059] A31 No. 1 winding support roller A32 No. 2 winding support roller A4 deviation correction mechanism A5 tension control mechanism

[0060] A6 cooling roller unwinding support rollerA61 No. 1 unwinding support rollerA62 No. 2 unwinding support rollerA7 moving assembly

[0061] A71 Moving component fixed plate A72 Linear guide element A73 Slider A74 Linear drive element

[0062] A75 movable assembly movable plate B1 reel B2 reel core B3 support roller

[0063] B4 deviation correction mechanism B5 tension control mechanism B6 moving assembly B61 fixed plate

[0064] B62 linear guide element B63 slider B64 drive element B65 movable plate DETAILED DESCRIPTION

[0065] 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.

[0066] In the description of the present invention, it should be understood that the terms "No. 1", "No. 2", etc. are only used to facilitate the description of the present invention and simplify the description, and therefore should not be understood as limiting the present invention.

[0067] One aspect of the present invention provides a method for cooling a lithium-coated electrode sheet during winding, comprising: providing a cooling roller and a winding shaft, wherein the cooling roller has the function of maintaining a low temperature, and the diameter of the cooling roller is calculated based on a comprehensive evaluation of the thickness of the lithium-coated electrode sheet, the winding length, and the expected cooling effect; the winding shaft has the function of rotating along its own axis; the lithium-coated electrode sheet is wound onto the cooling roller, and it is ensured that the lithium-coated electrode sheet is in direct contact with the cooling roller so that the cooling roller and the lithium-coated electrode sheet can be heat-conducted; the cooling roller is rotated to wind the lithium-coated electrode sheet onto the cooling roller and cool it by heat conduction; a winding core is fixed to the winding shaft, so that the winding shaft drives the winding core to rotate, and the lithium-coated electrode sheet cooled on the cooling roller is wound onto the winding core of the winding shaft.

[0068] In the above cooling method, heat conduction is used for cooling, which has the advantages of high efficiency and no pollution.

[0069] In order to ensure high cooling efficiency and winding efficiency in the present invention, the cooling roller diameter is usually designed according to the winding length and thickness of the lithium-coated electrode sheet. The designed cooling roller diameter is usually large enough, reaching more than 200 mm, for example, more than 300 mm, more than 500 mm or more than 750 mm, so as to ensure that the thickness of the lithium-coated electrode sheet on the cooling roller after winding does not exceed 30 mm.

[0070] The specific implementation scheme of the lithium-coated electrode sheet winding and cooling method of the present invention is described below in conjunction with the accompanying drawings.

[0071] Usually, the pole piece is replenished with lithium by coating it on one side or both sides. Depending on the pole pieces and lithium coating processes of different battery manufacturers, the thickness of the lithium-coated pole piece is usually 50-200μm.

[0072] Assume that the length L of the lithium-coated electrode sheet to be rolled up is 500 meters, and the thickness δ of the lithium-coated electrode sheet is taken as 120μm. In order to ensure the cooling effect of the cooling roller on the lithium-coated electrode sheet, the maximum thickness Δ of the lithium-coated electrode sheet on the cooling roller after rolling up is required not to exceed 25mm. The diameter D of the cooling roller is calculated by the following formula: D=738.9mm.

[0073]

[0074] According to the above calculation results, the diameter of the cooling roller can be designed to be 750 mm.

[0075] refer to Figure 1 , Figure 1 It is a schematic diagram of an embodiment of the present invention in which a deviation correction mechanism and a tension control mechanism are not provided.

[0076] As an embodiment of the present invention, the number of cooling rollers may be one, that is, a single cooling roller is used for cooling.

[0077] refer to Figure 2 and Figure 3 , Figure 2 This is a schematic diagram of the cooling roller winding operation of a single cooling roller implementation scheme of the present invention. Figure 3 This is a schematic diagram of the winding operation of the winding shaft of the single cooling roller embodiment of the present invention. Figure 2 and Figure 3 The single cooling roll embodiment is described in detail.

[0078] The pole piece P and the lithium strip P0 are compounded through the pole piece lithium coating equipment Z to form the lithium coated pole piece P1. The lithium coated pole piece P1 passes through the tension control mechanism A5 to achieve the tension control of the lithium coated pole piece P1, and then the lithium coated pole piece P1 is adjusted to the required position through the deviation correction mechanism A4. The lithium coated pole piece P1 passes through the support roller A3 and is wound onto the cooling roller A1, thus completing the work of winding the lithium coated pole piece P1 onto the cooling roller A1.

[0079] During the winding process of the cooling roller A1, the temperature sensor A2 arranged near the cooling roller A1 can monitor the temperature of the lithium-coated electrode sheet P1 on the cooling roller A1 in real time. Since the cooling roller A1 and the lithium-coated electrode sheet P1 are cooled by heat conduction, the temperature of the lithium-coated electrode sheet P1 closer to the inside of the cooling roller A1 is lower, and the temperature of the lithium-coated electrode sheet P1 exposed outside is higher. Therefore, the temperature measured by the temperature sensor A2 is usually approximately the highest temperature of the lithium-coated electrode sheet P1.

[0080] The temperature of the cooling roller A1 can be adjusted by measuring the temperature of the temperature sensor A2. For example, the temperature of the cooling roller A1 can be adjusted by adjusting the flow rate and temperature of the refrigerant in the cooling roller A1, thereby ensuring the cooling effect while reducing energy consumption.

[0081] Different materials of pole pieces react to different degrees with metallic lithium, and different battery manufacturers may have different requirements for the lithium-coated pole piece P1. However, whether it is to suppress the reaction of the lithium-coated pole piece P1 or to control the partial reaction of the lithium-coated pole piece P1, it can be monitored by measuring the temperature on the lithium-coated pole piece P1. The lower the temperature, the lower the reaction degree of the lithium-coated pole piece P1.

[0082] In this embodiment, in order to suppress the reaction of the lithium-coated pole piece P1 and to prevent potential safety hazards during the winding process of the lithium-coated pole piece P1, the temperature is controlled to be no more than 30°C, for example, 25°C, 20°C or 18°C. When the temperature monitored by the temperature sensor A2 is higher than 30°C, the temperature of the cooling roller A1 is reduced by reducing the temperature of the refrigerant in the cooling roller A1, increasing the flow rate of the refrigerant in the cooling roller A1, and other factors, so that the temperature difference between the lithium-coated pole piece P1 and the cooling roller A1 is increased, and the efficiency of heat conduction is increased, thereby quickly reducing the temperature of the lithium-coated pole piece P1. When the temperature monitored by the temperature sensor A2 is much lower than 30°C, the flow rate of the refrigerant in the cooling roller A1 can be appropriately reduced to achieve the purpose of energy saving.

[0083] After the cooling roller A1 completes the winding of the lithium-coated pole sheet P1, the cooled lithium-coated pole sheet P2 on the cooling roller A1 is wound onto the winding core B2 of the winding device B through the unwinding support roller A6, thereby rewinding the lithium-coated pole sheet P2 on the cooling roller A1 onto the winding core B2. Optionally, the lithium-coated pole sheet P2 passes through the tension control mechanism B5, the deviation correction mechanism B4 and the winding support roller B3 during the process of winding onto the winding core B2, so that the rewound lithium-coated pole sheet P2 is more orderly and the winding effect is better. Since this process does not involve other process steps, it only rewinds the cooled lithium-coated pole sheet P2 onto the winding core B2, so the rewinding speed can be very fast (for example, more than 100m / min, or even more than 1000m / min), and the time is very short, which avoids the reaction of the lithium-coated pole sheet P2 to produce temperature rise.

[0084] As another embodiment of the present invention, refer to Figure 5 and Figure 6 , the number of cooling rollers A1 can be 2. Figure 5 , Figure 5 It is a schematic diagram of the first cooling roller A11 in this embodiment winding and cooling the lithium-coated pole piece P1. The pole piece P and the lithium strip P0 are coated with lithium by the lithium coating equipment Z to form the lithium-coated pole piece P1. The lithium-coated pole piece P1 passes through the tension control mechanism A5, the deviation correction mechanism A4 and the first winding support roller A31 and is directly wound onto the first cooling roller A11. The first cooling roller A11 rotates to realize winding the lithium-coated pole piece P1 onto the cooling roller A11.

[0085] While the No. 1 cooling roller A11 is rewinding the lithium-coated electrode sheet P1, the lithium-coated electrode sheet P2 on the No. 2 cooling roller A12 can be wound onto the core B2 on the reel B1 through the No. 2 unwinding support roller A62, the tension control mechanism B5, the correction mechanism B4, and the reeling support roller B3. The reel B1 drives the core B2 to rotate, thereby rewinding the lithium-coated electrode sheet P2 from the No. 2 cooling roller A12 onto the core B2.

[0086] Generally, the winding speed of the first cooling roller A11 depends on the speed of the lithium coating equipment Z, and the process of rewinding the second cooling roller A12 to the winding core B2 is not limited by the process steps. Therefore, the process of rewinding the lithium-coated electrode P2 on the second cooling roller A12 to the winding core B2 can be completed quickly.

[0087] After the No. 1 cooling roller A11 completes the winding and cooling of the lithium-coated electrode sheet P1, the moving component A7 in the cooling roller assembly A drives the No. 1 cooling roller A11 and the No. 2 cooling roller A12 to move upward (in the upper direction of the figure), so that the No. 2 cooling roller A12 is aligned with the lithium-coated device Z. At the same time, the moving component B6 in the winding device B drives the winding shaft B1, the winding core B2, the winding support roller B3, the correction mechanism B4 and the tension control mechanism B5 to move upward (in the upper direction of the figure), so that the winding core B2 is aligned with the lithium-coated electrode sheet on the No. 1 cooling roller A11. At this time, the relative positions of the components are referenced Figure 6 .

[0088] refer to Figure 6 , the lithium-coated pole piece P1 formed after the pole piece P and the lithium strip P0 pass through the lithium coating equipment Z passes through the tension control mechanism A5, the deviation correction mechanism A4, and the second winding support roller A32 to be wound on the second cooling roller A12, and the winding and cooling process is completed by the rotation of the second cooling roller A12. At the same time, the lithium-coated pole piece P2 cooled on the first cooling roller A11 can pass through the first unwinding support roller A61, the tension control mechanism B5, the deviation correction mechanism B4, and the winding support roller B3 to be wound on the winding core B2 of the winding shaft B1, and the winding shaft B1 drives the winding core B2 to rotate, so that the lithium-coated pole piece P2 cooled by the first cooling roller A11 is rewound onto the winding core B2.

[0089] As another embodiment of the present invention, the number of cooling rollers A1 can be multiple, and the implementation method is similar to the implementation method of two cooling rollers, which will not be repeated here.

[0090] Another aspect of the present invention provides equipment for cooling and rolling up lithium-coated pole sheets, including: a cooling roller assembly, wherein the cooling roller assembly includes one or more cooling rollers, the cooling rollers have the function of maintaining low temperature, and are used for contact-type rolling up of the lithium-coated pole sheets, so that the lithium-coated pole sheets and the cooling rollers are cooled by heat conduction; a winding device, including a winding shaft and a winding core; the winding shaft has the function of rotating along its own axis, and is used for rewinding the cooled lithium-coated pole sheet on the cooling roller onto the winding core; the winding core is used to support the rolled-up lithium-coated pole sheet.

[0091] Optionally, the cooling roller assembly includes a temperature sensor, which is arranged near the cooling roller and is used to measure the temperature of the lithium-coated electrode on the cooling roller.

[0092] Optionally, the cooling roller assembly includes a moving assembly, which can drive the cooling roller to move along the axial direction of the cooling roller so as to align the winding position of the cooling roller with the lithium-coated electrode sheet.

[0093] Optionally, the cooling roller assembly includes a deviation correction mechanism, which may be a process deviation correction mechanism or a winding deviation correction mechanism.

[0094] Optionally, the cooling roller assembly includes a tension control mechanism, and the tension control mechanism is used to control the tension of the cooling roller when winding the lithium-coated electrode sheet.

[0095] Optionally, the winding device includes a moving component, which can drive the winding shaft to move along the axial direction of the winding shaft so as to align the winding core with the lithium-coated electrode sheet to be rewound on the cooling roller.

[0096] Optionally, the winding device includes a deviation correction mechanism, which may be a process deviation correction mechanism or a winding deviation correction mechanism.

[0097] Optionally, the winding device includes a tension control mechanism for controlling the tension of the winding shaft when rewinding the lithium-coated electrode.

[0098] 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.

[0099] refer to Figure 4 The device for winding and cooling the lithium-coated electrode sheet of the present invention comprises:

[0100] Cooling roller assembly A; in this embodiment, the cooling roller assembly A includes a cooling roller A1, a temperature sensor A2, a winding support roller A3, a correction mechanism A4, a tension control mechanism A5, an unwinding support roller A6 and a moving assembly A7.

[0101] Winding device B; in this embodiment, the winding device B includes a winding shaft B1, a winding core B2, a winding support roller B3, a correction mechanism B4, a tension control mechanism B5 and a moving component B6.

[0102] In the cooling roller assembly A, the cooling roller A1, the temperature sensor A2, the winding support roller A3, the unwinding support roller A6 are fixedly connected to the movable plate A75 in the moving assembly A7; the positions of the tension control mechanism A5 and the deviation correction mechanism A4 are fixed relative to the lithium coating device Z. The moving assembly A7 is composed of a fixed plate A71, a linear guide element A72, a slider A73, a driving element A74 and a movable plate A75; in this embodiment, the linear guide element A72 is a linear guide rail, and the driving element A74 is a linear pusher; when the driving element A74 drives the movable plate A75 to move, the components fixedly connected to the movable plate A75 move synchronously. The linear guide element A72 in this embodiment is not limited to a linear guide rail, and other forms of guide elements may also be used; the driving element A74 may also include a gear rack driven by a motor, or a ball screw driven by a motor, but is not limited to this.

[0103] In the winding device B, the winding shaft B1, winding core B2, winding support roller B3, deviation correction mechanism B4 and tension control mechanism B5 are all fixedly connected to the movable plate B65 in the moving component B6; the moving component B6 is composed of a fixed plate B61, a linear guide element B62, a slider B63, a driving element B64 and a movable plate B65. In this embodiment, the linear guide element B62 is a linear guide rail, and the driving element B64 is composed of a motor, a gear and a rack; when the driving element B64 drives the movable plate B65 to move, the components fixedly connected to the movable plate B65 move synchronously. The driving element B64 and the guiding element B62 include but are not limited to the above-mentioned forms, and other elements with similar functions can also be used.

[0104] 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 method for cooling a lithium-coated electrode sheet after winding, characterized in that: The method for winding and cooling the lithium-coated electrode sheet comprises: A cooling roller assembly and a winding device are provided downstream of the electrode lithium coating equipment, wherein The cooling roller assembly comprises a plurality of cooling rollers, wherein the diameter of each cooling roller is set to be greater than 200 mm, so that when the lithium-coated electrode sheet with a required length and a thickness of 50-200 μm is completely rolled up on one cooling roller, the total thickness of the lithium-coated electrode sheet wound on the cooling roller does not exceed 30 mm, and the cooling rollers are coaxially arranged and can be axially moved to switch positions. The winding device comprises a winding shaft and a winding core sleeved on the winding shaft, and is used to rewind the lithium-coated electrode sheet cooled by the cooling roller assembly onto the winding core; The winding position of one 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, and optionally after the position switching of the cooling roller, the cooled lithium-coated electrode sheet is wound onto a winding core.

2. The method for winding and cooling a lithium-coated electrode sheet 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 method for winding and cooling a lithium-coated electrode sheet according to claim 2, 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.

4. The method for winding and cooling a lithium-coated electrode sheet according to claim 3, characterized in that: The temperature of the outermost side of the lithium-coated electrode sheet wound on the cooling roller does not exceed 30°C.

5. The method for winding and cooling a lithium-coated electrode sheet according to claim 1, characterized in that: A temperature sensor is installed near the cooling roller to measure the temperature of the lithium electrode covering the cooling roller.

6. The method for winding and cooling a lithium-coated electrode sheet according to claim 1, characterized in that: The lithium-coated electrode sheet is wound onto a cooling roller or a winding core after passing through a tension control mechanism or a deviation correction mechanism, or a tension control mechanism and a deviation correction mechanism.

7. The method for winding and cooling a lithium-coated electrode sheet according to claim 1, characterized in that: The cooling roller assembly includes more than two cooling rollers. When the lithium-coated electrode sheet is wound onto a certain cooling roller for rewinding, the lithium-coated electrode sheet on another cooling roller is rewound onto the winding core of the rewinding shaft, and if there are still remaining cooling rollers, the lithium-coated electrode sheet on the remaining cooling rollers remains in a cooling state.

8. A device for winding and cooling lithium-coated pole pieces, characterized in that: The device comprises: A cooling roller assembly, comprising two or more cooling rollers with a diameter of more than 200 mm, wherein the two or more cooling rollers are coaxially arranged and can be axially moved to switch positions, wherein one cooling roller is used to roll up the lithium-coated pole sheet from the pole sheet lithium-coating equipment on the cooling roller, and the lithium-coated pole sheet on the other cooling roller is rewound onto the winding core of the winding shaft, and in the case of remaining cooling rollers, the lithium-coated pole sheet on the remaining cooling rollers is still kept in a cooling state; The winding device comprises a winding shaft and a winding core sleeved on the winding shaft, and is used for rewinding the lithium-coated electrode sheet cooled on the cooling roller onto the winding core.

9. The device for winding and cooling lithium-coated electrode sheets according to claim 8, characterized in that: The cooling roller assembly also includes a temperature sensor arranged near the cooling roller.

10. The device for winding and cooling lithium-coated electrode sheets according to claim 8, characterized in that: The cooling roller assembly further comprises one or more of a winding support roller, a deviation correction mechanism, a tension control mechanism, an unwinding support roller and a moving assembly, and / or The winding device further comprises one or more of a winding support roller, a deviation correction mechanism, a tension control mechanism and a moving component.

11. The device for winding and cooling lithium-coated electrode sheets according to claim 8, characterized in that: Each cooling roller in the cooling roller assembly is driven to rotate independently, or a reversing mechanism is used to switch the running direction between two cooling rollers.

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