Lithium ion battery negative plate rolling system

Abstract

The utility model relates to the technical field of batteries, and provides a lithium ion battery negative plate rolling system which comprises rolling equipment, first heating equipment, first cooling equipment, second heating equipment and second cooling equipment, the rolling equipment, the first heating equipment, the first cooling equipment, the second heating equipment and the second cooling equipment are arranged in sequence; the rolling equipment is used for rolling and straightening the negative electrode plate, the first heating equipment is used for carrying out first-time heating treatment on the rolled negative electrode plate, and the first cooling equipment is used for carrying out first-time cooling treatment on the negative electrode plate subjected to the first-time heating treatment; the second heating equipment is used for carrying out second heating treatment on the negative electrode plate subjected to the first cooling treatment, and the second cooling equipment is used for cooling the negative electrode plate subjected to the second heating treatment. According to the utility model, the thickness of the negative plate can be completely rebounded, the consistency of the thickness of the negative plate is ensured, the production time of the negative plate is saved, and the production efficiency of the negative plate is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a lithium-ion battery negative electrode sheet rolling system. Background Art

[0002] Lithium batteries are a type of battery that uses lithium metal or lithium alloy as positive / negative electrode materials and a non-aqueous electrolyte solution. Lithium-ion batteries do not contain metallic lithium and are rechargeable. They are small in size, pollution-free, highly safe, easy to carry and widely used.

[0003] At present, the negative electrode sheets of lithium-ion batteries must be rolled, left to stand and rebound, and then slit and wound. After rolling, the negative electrode sheets of lithium-ion batteries need to stand for four hours to allow their thickness to fully rebound before slitting. If the standing time does not meet the requirements, the negative electrode sheets cannot release the physical internal stress, resulting in a high rebound rate of the negative electrode sheets and the inability to reduce the thickness of the battery. Utility Model Content

[0004] The utility model provides a lithium ion battery negative electrode sheet rolling system, which is used to solve the problem in the prior art that the negative electrode sheet rolling system is difficult to fully rebound the thickness of the negative electrode sheet in a short time.

[0005] The utility model provides a lithium-ion battery negative electrode sheet rolling system, comprising: a rolling device, a first heating device, a first cooling device, a second heating device and a second cooling device;

[0006] The rolling device, the first heating device, the first cooling device, the second heating device and the second cooling device are arranged in sequence;

[0007] The rolling device rolls and straightens the negative electrode sheet, the first heating device is used to perform a first heating treatment on the negative electrode sheet after rolling, the first cooling device is used to perform a first cooling treatment on the negative electrode sheet after the first heating treatment, the second heating device is used to perform a second heating treatment on the negative electrode sheet after the first cooling treatment, and the second cooling device is used to cool the negative electrode sheet after the second heating treatment.

[0008] According to a lithium-ion battery negative electrode sheet rolling system provided by the utility model, the first heating device includes a first oven and a first pressing roller;

[0009] The first pressing roller is movably disposed in the first oven, the interior of the first oven has a heating chamber, and the first pressing roller is used to transport the negative electrode sheet in the heating chamber;

[0010] The heating chamber is used to heat the negative electrode sheet.

[0011] According to a lithium-ion battery negative electrode sheet rolling system provided by the utility model, the first oven includes a first box body and a heating wire;

[0012] The first pressing roller has a hollow first inner cavity, and the heating wire is arranged in the first inner cavity; the first pressing roller is movably arranged in the first box.

[0013] According to a lithium-ion battery negative electrode sheet rolling system provided by the present invention, the first heating device further includes a steam heating component;

[0014] The first pressing roller has a hollow first inner cavity, and the steam heating component is communicated with the first inner cavity of the first pressing roller to pass steam into the first inner cavity to heat the negative electrode sheet.

[0015] According to a lithium-ion battery negative electrode sheet rolling system provided by the present invention, the steam heating component includes: a steam source and a steam pipeline;

[0016] One end of the steam pipe is in communication with the steam source, and the other end of the steam pipe is in communication with the first inner cavity to form a closed loop system.

[0017] According to a lithium-ion battery negative electrode sheet rolling system provided by the utility model, the first oven heats the negative electrode sheet to 80 degrees to 120 degrees.

[0018] According to a lithium-ion battery negative electrode sheet rolling system provided by the utility model, the first cooling device includes: a first cooling roller and a refrigeration assembly;

[0019] The first cooling roller has a hollow second inner cavity, and the refrigeration component is communicated with the second inner cavity of the first cooling roller so as to introduce a cooling medium into the second inner cavity for cooling the negative electrode sheet.

[0020] According to a lithium-ion battery negative electrode sheet rolling system provided by the utility model, the refrigeration component includes a cooling medium source and a cooling pipe;

[0021] The cooling medium source is in communication with the cooling pipe, and the cooling pipe is in communication with the second inner cavity to form a closed-loop system.

[0022] According to a lithium-ion battery negative electrode sheet rolling system provided by the utility model, the first cooling device further includes: a temperature sensor, a controller and a flow regulating valve;

[0023] The temperature sensor is provided on the first cooling roller, and the flow regulating valve is provided on the cooling pipe;

[0024] The temperature sensor is connected to the controller, and the controller is connected to the flow regulating valve; the controller is used to control the opening of the flow regulating valve according to the temperature information detected by the temperature sensor.

[0025] According to a lithium-ion battery negative electrode sheet rolling system provided by the utility model, the temperature of the cooling medium of the refrigeration component is 5 degrees to 20 degrees.

[0026] The lithium-ion battery negative electrode sheet rolling system provided by the utility model uses a first heating device, a first cooling device, a second heating device, and a second cooling device, so that the negative electrode sheet rolled by the rolling device is heated in the first heating device, cooled in the first cooling device, heated again in the second heating device, and cooled in the second cooling device, so that the thickness of the negative electrode sheet is completely rebounded after being processed by the first heating device, the first cooling device, the second heating device, and the second cooling device, without the need for additional static rebound operation, thereby ensuring the consistency of the thickness of the negative electrode sheet, saving the production time of the negative electrode sheet, and improving the production efficiency of the negative electrode sheet. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 It is a schematic diagram of the lithium-ion battery negative electrode sheet rolling system provided by the utility model.

[0029] Reference numerals:

[0030] 1. Rolling equipment; 2. First heating equipment; 3. First cooling equipment; 4. Second heating equipment; 5. Second cooling equipment. DETAILED DESCRIPTION

[0031] To make the purpose, technical solutions, and advantages of the present invention more clear, the following will be combined with the accompanying drawings to clearly and completely describe the technical solutions of the present invention. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0032] The following combination Figure 1, the lithium-ion battery negative electrode sheet rolling system provided by the embodiment of the utility model is described in detail through specific embodiments and application scenarios.

[0033] In some embodiments, as Figure 1 As shown, this embodiment provides a lithium-ion battery negative electrode sheet rolling system, including: a rolling device 1, a first heating device 2, a first cooling device 3, a second heating device 4 and a second cooling device 5.

[0034] The rolling device 1, the first heating device 2, the first cooling device 3, the second heating device 4 and the second cooling device 5 are arranged in sequence.

[0035] The rolling device 1 rolls and straightens the negative electrode sheet, the first heating device 2 is used to perform the first heating treatment on the negative electrode sheet after rolling, the first cooling device 3 is used to perform the first cooling treatment on the negative electrode sheet after the first heating treatment, the second heating device 4 is used to perform the second heating treatment on the negative electrode sheet after the first cooling treatment, and the second cooling device 5 is used to cool the negative electrode sheet after the second heating treatment.

[0036] It is understandable that the hardness of the negative electrode sheet is relatively low, and large plastic deformation will occur after rolling the negative electrode sheet. The negative electrode sheet needs to be left to stand for 4 hours after rolling to rebound to ensure that the thickness of the negative electrode sheet has rebounded completely before the next step of slitting can be carried out. A long waiting time is required between rolling and slitting.

[0037] In this embodiment, two heating devices and two cooling devices are arranged behind the rolling device 1. The negative electrode sheet rolled by the rolling device 1 is first heated by the first heating device 2, so that the thickness rebound rate of the negative electrode sheet is 5% to 6%, and then cooled by the first cooling device 3. Subsequently, the negative electrode sheet after the first cooling is heated for the second time in the second heating device 4, so that the thickness rebound rate of the negative electrode sheet is 1% to 2%. Finally, the negative electrode sheet after the second heating is cooled for the second time, so that the thickness of the negative electrode sheet after the second cooling is completely rebounded, and can be directly cut without standing. The thickness rebound rate of the first heating device 2 and the second heating device 4 is controlled by controlling the heating temperature and heating time to achieve the desired rebound effect.

[0038] Specifically, the first heating device 2 and the second heating device 4 can heat the negative electrode sheet through a heating element, or they can heat the negative electrode sheet through heat exchange; the first cooling device 3 and the second cooling device 5 can cool the negative electrode sheet through heat exchange, or they can use a cooling plate to cool the negative electrode sheet.

[0039] The lithium-ion battery negative electrode sheet rolling system provided by the present invention uses the first heating device 2, the first cooling device 3, the second heating device 4 and the second cooling device 5, so that the negative electrode sheet rolled by the rolling device 1 is heated in the first heating device 2, cooled in the first cooling device, heated in the second heating device 4, and cooled in the second cooling device 5, so that the thickness of the negative electrode sheet after being processed by the first heating device 2, the first cooling device 3, the second heating device 4 and the second cooling device 5 is completely rebounded, and no additional static rebound operation is required, thereby ensuring the consistency of the thickness of the negative electrode sheet, saving the production time of the negative electrode sheet, and improving the production efficiency of the negative electrode sheet.

[0040] In some embodiments, the first heating device 2 of this embodiment includes a first oven and a first pressing roller.

[0041] The first pressing roller is movably arranged in the first oven. The first oven has a heating chamber inside. The first pressing roller is used to transport the negative electrode sheet in the heating chamber.

[0042] The heating chamber is used to heat the negative electrode sheet.

[0043] It is understandable that the first pressing roller is driven by a corresponding driving device to move in the first oven.

[0044] The temperature in the heating chamber of the first oven is higher than the ambient temperature, and the negative electrode sheet conveyed in the first oven has been heated, so that the temperature of the negative electrode sheet is increased, thereby eliminating the physical internal stress of the lithium-ion battery.

[0045] In some embodiments, the first oven of this embodiment includes a first box body and a heating wire.

[0046] The first pressing roller has a hollow first inner cavity, and the heating wire is arranged in the first inner cavity; the first pressing roller is movably arranged in the first box body.

[0047] It can be understood that the heating wires of this embodiment are evenly arranged along the upper pressing surface of the first pressing roller to ensure that the temperature of the entire upper pressing surface of the first pressing roller is uniform and constant.

[0048] Specifically, the heating wire of this embodiment may be an electric heating wire, and the temperature of the electric heating wire can be controlled.

[0049] In this embodiment, a heating wire is arranged in the first inner cavity of the first pressing roller, so that the negative electrode sheet can be heated on the rolling surface. The heating arrangement structure is simple and the heating effect is good.

[0050] In some embodiments, the first heating device 2 of this embodiment further includes a steam heating component.

[0051] The first pressing roller has a hollow first inner cavity, and the steam heating component is communicated with the first inner cavity of the first pressing roller so as to pass steam into the first inner cavity to heat the negative electrode sheet.

[0052] It can be understood that steam circulates in the circulation loop formed by the steam heating component and the first inner cavity of the first pressing roller to continuously heat the negative electrode sheet. During the process of being conveyed by the first pressing roller, the negative electrode sheet is heated by heat exchange with the steam, and the heating effect is good.

[0053] In some embodiments, the steam heating component of this embodiment includes: a steam source and a steam pipe.

[0054] One end of the steam pipe is communicated with the steam source, and the other end of the steam pipe is communicated with the first inner cavity to form a closed loop system.

[0055] It is understandable that the steam source is used to provide stable steam, and the steam source can be a steam boiler or a steam tank.

[0056] The steam pipe connects the steam source with the first inner cavity, so that the steam in the steam source can be continuously transported to the first inner cavity, so that the negative electrode sheet is heated. The steam after heat exchange is transported back to the steam source by the steam pipe to achieve steam recycling.

[0057] In some embodiments, the first oven of this embodiment heats the negative electrode sheet to 80 degrees Celsius to 120 degrees Celsius.

[0058] It is understandable that by controlling the temperature of the heating chamber of the first oven, the negative electrode sheet is heated to 80 degrees to 120 degrees in the first oven, so that the thickness rebound rate of the negative electrode sheet in the first heating device 2 can be controlled at 5% to 6%.

[0059] At the same time, the structure of the second heating device 4 of this embodiment is the same as that of the first heating device 2, and will not be described in detail here.

[0060] In some embodiments, as Figure 1 As shown, the first cooling device 3 of this embodiment includes: a first cooling roller and a refrigeration assembly.

[0061] The first cooling roller has a hollow second inner cavity. The refrigeration component is communicated with the second inner cavity of the first cooling roller so as to allow a cooling medium to flow into the second inner cavity to cool the negative electrode sheet.

[0062] It can be understood that the cooling medium circulates in the circulation loop formed by the refrigeration component and the second inner cavity of the first cooling roller to continuously cool the negative electrode sheet. During the process of being conveyed by the first cooling roller, the negative electrode sheet is cooled by heat exchange with the cooling medium, and the cooling effect is good.

[0063] Specifically, the cooling medium may be cooling water.

[0064] In some embodiments, the refrigeration assembly of this embodiment includes a cooling medium source and a cooling pipe.

[0065] The cooling medium source is communicated with the cooling pipeline, and the cooling pipeline is communicated with the second inner cavity to form a closed loop system.

[0066] It is understandable that the cooling medium source is used to provide a stable cooling medium, and the cooling medium source can be a cooling tank or a cooling tower.

[0067] The cooling pipe connects the cooling medium source with the second inner cavity, so that the cooling medium in the cooling medium source can be continuously transported to the second inner cavity, so that the negative electrode sheet is cooled. The cooling medium after heat exchange is transported back to the cooling medium source by the cooling pipe to realize the recycling of the cooling medium.

[0068] In some embodiments, the first cooling device 3 of this embodiment further includes: a temperature sensor, a controller, and a flow regulating valve.

[0069] The temperature sensor is arranged on the first cooling roller, and the flow regulating valve is arranged on the cooling pipeline.

[0070] The temperature sensor is connected to the controller, and the controller is connected to the flow control valve; the controller is used to control the opening of the flow control valve according to the temperature information detected by the temperature sensor.

[0071] It is understandable that when the cooling medium of the first cooling device 3 cools the negative electrode sheet, it is necessary to control the temperature of the first cooling roller, thereby controlling the cooling temperature of the negative electrode sheet.

[0072] The temperature sensor may be an infrared thermometer or a thermal resistor.

[0073] This embodiment is capable of automatically controlling the cooling temperature of the negative electrode sheet passing through the first cooling roller by providing a temperature sensor, a controller and a flow control valve, thereby achieving the effect of regulating the temperature of the negative electrode sheet, improving production efficiency, achieving high heat exchange efficiency and ensuring the reliability of the cooling of the negative electrode sheet.

[0074] In some embodiments, the temperature of the cooling medium of the refrigeration assembly of this embodiment is 5 degrees to 20 degrees.

[0075] It is understandable that by controlling the temperature of the cooling medium of the refrigeration component to 5 degrees to 20 degrees, the negative electrode sheet is quickly cooled in the first cooling device 3 after being heated by the first heating device 2, so that the resilience of the thickness of the negative electrode sheet is better controlled.

[0076] At the same time, the structure of the second cooling device 5 of this embodiment is the same as that of the first cooling device 3, and will not be described in detail here. Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some of the technical features therein with equivalents. However, such modifications or replacements do not deviate from the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A lithium-ion battery negative electrode sheet rolling system, characterized in that: include: A rolling device, a first heating device, a first cooling device, a second heating device, and a second cooling device; The rolling device, the first heating device, the first cooling device, the second heating device and the second cooling device are arranged in sequence; The rolling device rolls and straightens the negative electrode sheet, the first heating device is used to perform a first heating treatment on the negative electrode sheet after rolling, the first cooling device is used to perform a first cooling treatment on the negative electrode sheet after the first heating treatment, the second heating device is used to perform a second heating treatment on the negative electrode sheet after the first cooling treatment, and the second cooling device is used to cool the negative electrode sheet after the second heating treatment.

2. The lithium-ion battery negative electrode sheet rolling system according to claim 1, characterized in that: The first heating device includes a first oven and a first pressing roller; The first pressing roller is movably disposed in the first oven, the interior of the first oven has a heating chamber, and the first pressing roller is used to transport the negative electrode sheet in the heating chamber; The heating chamber is used to heat the negative electrode sheet.

3. The lithium-ion battery negative electrode sheet rolling system according to claim 2, characterized in that: The first oven includes a first box body and a heating wire; The first pressing roller has a hollow first inner cavity, and the heating wire is arranged in the first inner cavity; the first pressing roller is movably arranged in the first box.

4. The lithium-ion battery negative electrode sheet rolling system according to claim 2, characterized in that: The first heating device also includes a steam heating component; The first pressing roller has a hollow first inner cavity, and the steam heating component is communicated with the first inner cavity of the first pressing roller to pass steam into the first inner cavity to heat the negative electrode sheet.

5. The lithium-ion battery negative electrode sheet rolling system according to claim 4, characterized in that: The steam heating component includes: a steam source and a steam pipeline; One end of the steam pipe is in communication with the steam source, and the other end of the steam pipe is in communication with the first inner cavity to form a closed loop system.

6. The lithium-ion battery negative electrode sheet rolling system according to claim 2, characterized in that: The first oven heats the negative electrode sheet to 80 degrees Celsius to 120 degrees Celsius.

7. The lithium-ion battery negative electrode sheet rolling system according to claim 1, characterized in that: The first cooling device includes: a first cooling roller and a refrigeration assembly; The first cooling roller has a hollow second inner cavity, and the refrigeration component is communicated with the second inner cavity of the first cooling roller so as to introduce a cooling medium into the second inner cavity for cooling the negative electrode sheet.

8. The lithium-ion battery negative electrode sheet rolling system according to claim 7, characterized in that: The refrigeration assembly includes a cooling medium source and a cooling pipeline; The cooling medium source is in communication with the cooling pipe, and the cooling pipe is in communication with the second inner cavity to form a closed-loop system.

9. The lithium-ion battery negative electrode sheet rolling system according to claim 8, characterized in that: The first cooling device further includes: a temperature sensor, a controller and a flow regulating valve; The temperature sensor is provided on the first cooling roller, and the flow regulating valve is provided on the cooling pipe; The temperature sensor is connected to the controller, and the controller is connected to the flow regulating valve; the controller is used to control the opening of the flow regulating valve according to the temperature information detected by the temperature sensor.

10. The lithium-ion battery negative electrode sheet rolling system according to claim 7, characterized in that: The temperature of the cooling medium of the refrigeration component is 5 degrees to 20 degrees.

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