Rolling thermal expansion and cold contraction device

Abstract

The utility model discloses a rolling thermal expansion and cold contraction device which comprises a pair of roller sets, a thickness gauge, a plurality of temperature sensors and a temperature regulation and control assembly, the roller sets are provided with a plurality of temperature control flow channels, one temperature sensor is correspondingly arranged in one temperature control flow channel, the thickness gauge is used for detecting the thickness of a pole piece, and the temperature regulation and control assembly is used for regulating and controlling the temperature of the pole piece. The thickness gauge and the temperature sensor are respectively connected with the temperature regulation and control assembly, and the temperature regulation and control assembly is connected with the temperature control flow channel. The temperature regulation and control assembly adjusts the temperature of liquid input into the temperature control flow channel according to data detected by the temperature sensor and the thickness gauge so as to enable the deformation position of the roller set to expand with heat and contract with cold. According to the rolling thermal expansion and cold contraction device, liquid is conveyed to the deformation part of the upper roller or the lower roller, so that the deformation part of the upper roller or the lower roller is subjected to thermal expansion and cold contraction, the size of the roller group is controlled, and an electrode plate meeting the process requirement is rolled.

Description

Technical Field

[0001] This utility model relates to the technical field of electrode manufacturing equipment, specifically to a roller pressing thermal expansion and contraction device. Background Technology

[0002] In recent years, new energy vehicles have developed rapidly. Battery drive systems are the main factors affecting the performance and cost of new energy vehicles. Rechargeable batteries, due to their high energy density, low memory effect, and high operating voltage, have become the preferred power battery solution in the current new energy vehicle battery drive systems.

[0003] Lithium-ion batteries (LIBs), as a type of rechargeable battery, have the characteristics of high energy density, long service life, energy saving and environmental protection.

[0004] The manufacturing process of lithium-ion battery electrodes typically includes steps such as slurry preparation, coating, drying, rolling, and cutting. Although the manufacturing processes may vary between different manufacturers or different batteries, electrode rolling is an essential step. After rolling, the electrode achieves a certain compaction density, which is crucial for improving the energy density of lithium-ion batteries.

[0005] Electrode rolling typically employs a double-roll cold pressing technique. This technique uses a cold press at room temperature to roll the electrode to achieve the designed thickness. During the rolling process, the cold pressing rollers deform under the reaction force of the electrode, such as... Figure 1 As shown, the upper and lower rollers will have a bulge in the middle, resulting in the rolled electrode sheet being thicker in the middle and lower on both sides, which in turn affects the quality of the lithium-ion battery. Utility Model Content

[0006] To solve at least one technical problem of the prior art, this utility model provides a roller pressing thermal expansion and contraction device and its preparation method.

[0007] To achieve the above-mentioned utility model objectives, the technical solution adopted by this utility model is: a roller pressing thermal expansion and contraction device, comprising a pair of roller groups, a thickness gauge, multiple temperature sensors, and a temperature control component. The roller groups are provided with multiple temperature-controlled flow channels, and a temperature sensor is correspondingly provided in each temperature-controlled flow channel. The thickness gauge is used to detect the thickness of the electrode sheet. The thickness gauge and the temperature sensors are respectively connected to the temperature control component. The temperature control component is connected to the temperature-controlled flow channels. The temperature control component adjusts the liquid temperature input into the temperature-controlled flow channels according to the data detected by the temperature control component and the temperature-controlled flow channels to cause thermal expansion and contraction at the deformation points of the roller groups.

[0008] In some embodiments, the temperature-controlled flow channel has an inlet and an outlet;

[0009] The temperature regulating assembly comprises a plurality of liquid inlet pipes and a plurality of liquid outlet pipes, one end of the liquid inlet pipe is connected with the liquid inlet, and one end of the liquid outlet pipe is connected with the liquid outlet.

[0010] In some embodiments, the temperature regulating assembly further comprises a mold temperature controller connected with the plurality of liquid inlet pipes and the plurality of liquid outlet pipes.

[0011] In some embodiments, the mold temperature controller has a controller electrically connected with the thickness gauge and the plurality of temperature sensors.

[0012] In some embodiments, the pair of roller sets comprises an upper roller and a lower roller arranged oppositely, and the upper roller and the lower roller are respectively provided with a plurality of temperature control flow channels.

[0013] In some embodiments, the plurality of temperature control flow channels are distributed along the axial direction of the upper roller and the lower roller, and the liquid inlet and the liquid outlet of one temperature control flow channel are arranged at the same end of the upper roller or the lower roller.

[0014] In some embodiments, the upper roller has an upper rotating shaft, and the liquid inlet and the liquid outlet are arranged on the upper rotating shaft.

[0015] The lower roller has a lower rotating shaft, and the liquid inlet and the liquid outlet are arranged on the lower rotating shaft.

[0016] In some embodiments, the plurality of liquid inlet pipes are connected with the liquid inlets through rotary joints.

[0017] The plurality of liquid outlet pipes are connected with the liquid outlets through rotary joints.

[0018] The beneficial effects of the present application are as follows:

[0019] The roller pressing thermal expansion and contraction device of the present application sends liquid to the deformation part of the upper roller or the lower roller, so that the deformation part of the upper roller or the lower roller performs thermal expansion and contraction, thereby controlling the size of the roller set and rolling out an electrode sheet meeting the process requirements. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is the state diagram of the deformed roller after long-term use;

[0021] Figure 2 is a schematic diagram of the three-dimensional structure of the roller pressing thermal expansion and contraction device in the first embodiment of the present application. DETAILED DESCRIPTION

[0022] In order to make the person skilled in the art better understand the scheme of the present application, the technical scheme in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the person skilled in the art without creative labor should belong to the scope of protection of the present application.

[0023] It should be noted that the terms "first", "second", and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0024] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0025] In addition, in addition to indicating the orientation or positional relationship, the above-mentioned part of the terms can also be used to indicate other meanings, for example, the term "upper" can also be used to indicate a certain dependent relationship or connection relationship in some cases. For the person skilled in the art, the specific meaning of these terms in the present application can be understood according to the specific circumstances.

[0026] In addition, the terms "mounting", "setting", "providing", "connecting", "connecting", "sleeving" should be broadly understood. For example, it can be fixedly connected, detachably connected, or integrally constructed; it can be mechanically connected or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium, or internal communication between two devices, elements or components. For the person skilled in the art, the specific meaning of the above-mentioned terms in the present application can be understood according to the specific circumstances.

[0027] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0028] Embodiment one

[0029] With reference to Figure 2 The utility model provides a kind of roll pressure thermal expansion and cold shrink device, including a pair of roller set, thickness gauge 6, multiple temperature sensors 7 and temperature control component, roller set is provided with multiple temperature control flow channel 40, one temperature control flow channel 40 is correspondingly provided with one temperature sensor 7, thickness gauge 6 is used to detect the thickness of pole piece, thickness gauge 6 and temperature sensor 7 are connected with temperature control component respectively, temperature control component is connected with temperature control flow channel 40, temperature control component adjusts the temperature of liquid in temperature control flow channel 40 according to the data detected by temperature sensor 7 and thickness gauge 6 to make the deformation of roller set heat expansion and cold shrink, to control the size of roller set, roll out the electrode piece that meets process requirement.

[0030] In certain embodiments, temperature control flow channel has liquid inlet and liquid outlet. Temperature control component includes mould temperature controller 50, multiple liquid inlet pipes 51 and multiple liquid outlet pipes 52, multiple liquid inlet pipes 51 are one-to-one with multiple temperature control flow channels, and multiple liquid outlet pipes 52 are one-to-one with multiple temperature control flow channels. Wherein, one end of liquid inlet pipe 51 is connected with temperature control flow channel 40, and the other end is connected with the liquid inlet of temperature control flow channel; one end of liquid outlet pipe 52 is connected with temperature control flow channel 40, and the other end is connected with the liquid outlet of temperature control flow channel. Liquid inlet pipe 51, temperature control flow channel, liquid outlet pipe 52 and mould temperature controller 50 form a liquid circuit, and the liquid heated or cooled by mould temperature controller 50 enters temperature control flow channel from liquid inlet pipe 51, so that the deformation of roller set heat expansion and cold shrink, so that the deformation of roller set restores, and the liquid in temperature control flow channel after temperature transfer to roller set finally returns to mould temperature controller 50 through liquid outlet pipe 52.

[0031] Mould temperature controller 50 has controller, heater and cooler, and the controller is connected with heater, cooler, thickness gauge 6 and temperature sensor 7 respectively, and thickness gauge 6 and temperature sensor 7 transmit to the controller, and the controller heats or cools liquid to adjust the temperature of liquid by heater and / or cooler.

[0032] Specifically, the thickness gauge 6 detects the thickness of the pole piece from left to right or from right to left, and when the thickness of a certain position of the pole piece is detected to be out of the range, the measurement result is transmitted to the controller, and the detection continues; the temperature sensor 7 corresponding to the position of the pole piece with abnormal thickness detects the temperature of the liquid in the temperature control flow channel, and transmits the detected liquid problem to the controller; after receiving the detection results of the thickness gauge 6 and the temperature sensor 7, the controller obtains the set temperature of the liquid supplied to the roller set by calculation, and controls the heater and / or cooler to heat or cool the liquid to adjust the temperature of the liquid to the set temperature. The liquid at the set temperature is delivered to the temperature control flow channel through the liquid inlet pipe 51.

[0033] Specifically, the controller obtains the set temperature of the liquid by the formula: ΔL = L * α * ΔT, wherein ΔL represents the change in length, L represents the original length of the steel material, α represents the linear expansion coefficient of a specific type of steel, and ΔT represents the change in temperature. When the roller set is made of tool steel, α ≈ 11 x 10^-6 / °C.

[0034] Further, the liquid inlet pipe 51 and the liquid outlet pipe 52 are respectively provided with electromagnetic valves connected with the controller.

[0035] In some embodiments, a pair of roller sets is composed of an upper roller 41 and a lower roller 42 arranged opposite to each other, and the upper roller 41 and the lower roller 42 are respectively provided with a plurality of temperature control flow channels 40.

[0036] In some embodiments, the plurality of temperature control flow channels 40 are spaced along the axial direction of the upper roller 41 or the lower roller 42, and the liquid inlet and the liquid outlet of one temperature control flow channel 40 are arranged at the same end of the upper roller 41 or the lower roller 42.

[0037] Further, the temperature control flow channel 40 includes a deformation flow channel 401 and two delivery flow channels 402. The deformation flow channel 401 is annular and extends along the circumferential direction of the upper roller 41 or the lower roller 42. One end of each of the two delivery flow channels 402 is in communication with the deformation flow channel 401, and the other end of one delivery flow channel 402 is connected with the liquid inlet pipe 51, and the other end of the other delivery flow channel 402 is connected with the liquid outlet pipe 52.

[0038] The deformation flow channels 401 of the plurality of temperature control flow channels 40 are spaced along the axial direction of the upper roller 41 or the lower roller 42, and the delivery flow channels 402 of the plurality of temperature control flow channels 40 are spaced along the circumferential direction of the upper roller 41 or the lower roller 42.

[0039] Specifically, the upper roller 41 or the lower roller 42 is divided into N regions in the axial direction, and one deformation flow channel 401 is arranged in each region, and the upper roller 41 or the lower roller 42 in the region is expanded by heat and contracted by cold through the deformation flow channel 401, so that the size of the upper roller 41 or the lower roller 42 in the region is controlled, and an electrode sheet meeting the process requirements is rolled out, wherein N is not less than 4.

[0040] When the delivery flow channel 402 of the second temperature control flow channel 40 needs to pass through the deformation flow channel 401 of the first temperature control flow channel 40, the deformation flow channel 401 of the first temperature control flow channel 40 is provided with a heat insulation pipe, and the delivery flow channels 402 of the second temperature control flow channel 40 located on both sides of the deformation flow channel 401 of the first temperature control flow channel 40 are communicated through the heat insulation pipe.

[0041] In some embodiments, the upper roller 41 has an upper rotating shaft 410, and the liquid inlets and outlets of the plurality of temperature control flow channels 40 are arranged on the upper rotating shaft 410; and the lower roller 42 has a lower rotating shaft 420, and the liquid inlets and outlets of the plurality of temperature control flow channels 40 are arranged on the lower rotating shaft 420.

[0042] In some embodiments, a plurality of liquid inlet pipes 51 are connected to the liquid inlets of the temperature control flow channels 40 through rotary joints, and a plurality of liquid outlet pipes 52 are connected to the liquid outlets of the temperature control flow channels 40 through rotary joints.

[0043] The operation process of the roller pressing heat expansion and cold contraction device is as follows:

[0044] 1. The thickness gauge 6 detects the thickness of the electrode sheet from left to right or from right to left, and the plurality of temperature sensors 7 continuously measure the liquid temperature in the different temperature control flow channels 40;

[0045] 2. The controller receives the measurement data of the thickness gauge 6 and the plurality of temperature sensors 7, and corresponds the abnormal position of the electrode sheet thickness to the liquid temperature of the temperature control flow channel 40 of the region of the upper roller 41 or the lower roller 42;

[0046] 3. The controller calculates the set temperature of the liquid supplied to the upper roller 41 or the lower roller 42, and controls the heater and / or the cooler to heat or cool the liquid to adjust the temperature of the liquid to the set temperature, and the liquid at the set temperature is delivered to the temperature control flow channel 40 through the liquid inlet pipe 51;

[0047] 4. The region corresponding to the abnormal position of the electrode sheet thickness of the upper roller 41 or the lower roller 42 starts to expand by heat and contract by cold, so that the size of the upper roller 41 or the lower roller 42 in the region is controlled, and an electrode sheet meeting the process requirements is rolled out.

[0048] The above description of disclosed embodiments enables one of ordinary skill in the art to make or use the application. Various modifications to the above described embodiments will be readily apparent to those of ordinary skill in the art and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A roll-to-roll thermal expansion and contraction apparatus, characterized by, The device comprises a pair of roller sets, a thickness gauge (6), a plurality of temperature sensors (7), and a temperature control assembly. The roller set is provided with a plurality of temperature control channels (40), one temperature sensor (7) is arranged in each temperature control channel (40). The thickness gauge (6) is used to detect the thickness of the pole piece. The thickness gauge (6) and the temperature sensor (7) are respectively connected to the temperature control assembly. The temperature control assembly is connected to the temperature control channel (40). The temperature control assembly adjusts the temperature of the liquid in the temperature control channel (40) according to the data detected by the temperature sensor (7) and the thickness gauge (6) to make the deformation of the roller set expand or contract with heat.

2. The roller pressing thermal expansion and contraction device according to claim 1, wherein the temperature control channel has a liquid inlet and a liquid outlet; the temperature control assembly comprises a plurality of liquid inlet pipes (51) and a plurality of liquid outlet pipes (52), one end of the liquid inlet pipe (51) is connected to the liquid inlet, and one end of the liquid outlet pipe (52) is connected to the liquid outlet.

3. The roller pressing thermal expansion and contraction device according to claim 2, wherein the temperature control assembly further comprises a mold temperature machine (50), and the mold temperature machine (50) is connected to the plurality of liquid inlet pipes (51) and the plurality of liquid outlet pipes (52).

4. The roller pressing thermal expansion and contraction device according to claim 3, wherein the mold temperature machine (50) has a controller, and the controller is electrically connected to the thickness gauge (6) and the temperature sensor (7).

5. The roller pressing thermal expansion and contraction device according to claim 2, wherein the pair of roller sets comprises an upper roller (41) and a lower roller (42) arranged oppositely, and the upper roller (41) and the lower roller (42) are respectively provided with a plurality of temperature control channels (40).

6. The roller pressing thermal expansion and contraction device according to claim 5, wherein the plurality of temperature control channels (40) are distributed along the axial direction of the upper roller (41) and the lower roller (42), and the liquid inlet and the liquid outlet of one temperature control channel (40) are arranged at the same end of the upper roller (41) or the lower roller (42).

7. The roller pressing thermal expansion and contraction device according to claim 6, wherein the upper roller (41) has an upper rotating shaft (410), and the liquid inlet and the liquid outlet are arranged on the upper rotating shaft (410); the lower roller (42) has a lower rotating shaft (420), and the liquid inlet and the liquid outlet are arranged on the lower rotating shaft (420).

8. The roller pressing thermal expansion and contraction device according to claim 7, wherein the plurality of liquid inlet pipes (51) are connected to the liquid inlet through a rotating joint, and the plurality of liquid outlet pipes (52) are connected to the liquid outlet through a rotating joint. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Images