Coating equipment

Abstract

The embodiment of the utility model discloses coating equipment which comprises a first tank body, a second tank body, a coating assembly and a temperature adjusting device. The first can body is used for storing battery active materials. The second tank body comprises a bottom wall and a peripheral side wall, the peripheral side wall is connected to the bottom wall, the bottom wall and the peripheral side wall define a containing cavity, and the containing cavity is used for storing a flowable heat exchange medium. At least the bottom of the first tank is located in the containing cavity. The bottom wall is provided with a first liquid inlet, and the peripheral side wall is provided with a first liquid outlet. The temperature adjusting device is provided with a second liquid inlet and a second liquid outlet, the second liquid inlet is connected with the first liquid outlet, the second liquid outlet is connected with the first liquid inlet, and the temperature adjusting device is used for adjusting the temperature of the heat exchange medium flowing through the temperature adjusting device. According to the embodiment of the invention, the temperature controllability of the battery active substance can be improved, so that the coating quality is improved.

Description

Technical Field

[0001] The present application relates to the technical field of devices for coating fluid on a surface, and in particular to a coating device. Background Art

[0002] The coating process is a process of coating one or more layers of liquid on a substrate. In the production process of lithium-ion battery pole pieces, the slurry (liquid battery active material) is coated on the substrate and then dried to form the pole piece. The temperature of the slurry affects the viscosity of the slurry, and the viscosity of the slurry directly affects the coating quality.

[0003] In the prior art, the tank storing the slurry in the coating equipment cannot be insulated, resulting in the uncontrollable temperature of the slurry. Utility Model Content

[0004] The embodiments of the present application provide a coating device to improve the temperature controllability of battery active materials, thereby improving the coating quality.

[0005] In order to solve the above technical problems, the embodiments of the present application disclose the following technical solutions:

[0006] On the one hand, a coating device is provided, which includes a first tank body, a coating assembly, a second tank body and a temperature control device. The first tank body is used to store battery active materials, and the first tank body is provided with a first discharge port. The coating assembly is provided with a first feed port, the first feed port is connected to the first discharge port, and the coating assembly is used to coat the battery active materials on a substrate. The second tank body includes a bottom wall and a peripheral side wall, the peripheral side wall is connected to the bottom wall, the bottom wall and the peripheral side wall are surrounded to form a receiving cavity, and the receiving cavity is used to store a flowable heat exchange medium. At least the bottom of the first tank body is located in the receiving cavity. The bottom wall is provided with a first liquid inlet, and the peripheral side wall is provided with a first liquid outlet. The temperature control device is provided with a second liquid inlet and a second liquid outlet, the second liquid inlet is connected to the first liquid outlet, and the second liquid outlet is connected to the first liquid inlet, and the temperature control device is used to adjust the temperature of the heat exchange medium flowing through the temperature control device.

[0007] In addition to one or more of the features disclosed above, or as an alternative, the first tank body is provided with a second feed port, and the second feed port is connected to the first discharge port. The coating equipment also includes a first valve and a second valve. The first valve is arranged on the downstream side of the first discharge port and the upstream side of the first feed port along the conveying path from the first discharge port to the first feed port, and the first valve is used to selectively open or block the first discharge port and the first feed port. The second valve is arranged on the downstream side of the first discharge port and the upstream side of the second feed port along the conveying path from the first discharge port to the second feed port, and the second valve is used to selectively open or block the first discharge port and the second feed port. Among them, along the conveying path from the first discharge port to the first feed port, the second valve is arranged on the upstream side of the first valve.

[0008] In addition to one or more features disclosed above, or as an alternative, the coating device further comprises a first pipeline and / or a second pipeline. One end of the first pipeline is connected to the first liquid outlet, and the other end is connected to the second liquid inlet. One end of the second pipeline is connected to the second liquid outlet, and the other end is connected to the first liquid inlet.

[0009] In addition to or as an alternative to one or more of the features disclosed above, the coating device further comprises a first pump body and a second pump body. The first pump body is used to pump the heat exchange medium in the second tank body into the temperature control device. The second pump body is used to pump the heat exchange medium in the temperature control device into the second tank body.

[0010] In addition to or as an alternative to one or more features disclosed above, the height of the first tank body is D1 cm, and the distance between the lower edge of the hole wall of the first liquid outlet and the top of the first tank body is D2 cm, satisfying: 0.08*D1≤D2≤0.15*D1.

[0011] In addition to or as an alternative to one or more of the features disclosed above, the coating device further comprises a temperature sensor and a controller. At least a portion of the temperature sensor extends into the first tank. The controller is electrically connected to the temperature sensor and the temperature regulating device, respectively.

[0012] In addition to one or more of the features disclosed above, or as an alternative, the coating device also includes a third tank body, a third pump body and a fourth pump body. The third tank body is provided with a third feed port and a third discharge port, the third feed port is connected to the first discharge port, and the third discharge port is connected to the first feed port. The third pump body is used to drive the battery active material in the first tank body to be pumped into the third tank body. The fourth pump body is used to pump the battery active material in the third tank body into the coating assembly. Among them, along the conveying path from the third discharge port to the first feed port, the second valve is located on the downstream side of the fourth pump body and on the upstream side of the first valve.

[0013] In addition to one or more features disclosed above, or as an alternative, the third pump body is provided with a fourth feed port and a fourth discharge port. The fourth pump body is provided with a fifth feed port and a fifth discharge port. The coating device also includes a third pipeline, a fourth pipeline, a fifth pipeline, a sixth pipeline and a seventh pipeline. One end of the third pipeline is connected to the first discharge port, and the other end is connected to the fourth feed port. One end of the fourth pipeline is connected to the fourth discharge port, and the other end is connected to the third feed port. One end of the fifth pipeline is connected to the third discharge port, and the other end is connected to the fifth feed port. One end of the sixth pipeline is connected to the fifth discharge port, and the other end is connected to the first feed port. One end of the seventh pipeline is connected to the sixth pipeline, and the other end is connected to the second feed port. Among them, the first valve is arranged on the sixth pipeline and is located at the downstream side of the connection between the seventh pipeline and the sixth pipeline. The first valve is used to selectively conduct or block the sixth pipeline, and the second valve is arranged on the seventh pipeline for selectively conducting or blocking the seventh pipeline.

[0014] In addition to or as an alternative to one or more features disclosed above, the lengths of the third pipeline, the fourth pipeline, the fifth pipeline and the sixth pipeline are all in the range of 1m to 3m, and the length of the seventh pipeline is within 10m.

[0015] In addition to or as an alternative to one or more features disclosed above, an outer surface of at least one of the third pipeline, the fourth pipeline, the fifth pipeline, the sixth pipeline and the seventh pipeline is covered with an insulation layer, and the thickness of the insulation layer is in the range of 0.5 cm to 2 cm.

[0016] One of the above technical solutions has the following advantages or beneficial effects:

[0017] The second tank body forms a storage cavity for storing a heat exchange medium, and at least the bottom of the first tank body is located in the second tank body. The heat exchange medium in the second tank body can transfer heat with the battery active material in the first tank body and adjust the temperature of the battery active material in the first tank body. The temperature regulating device adjusts the temperature of the heat exchange medium, and then adjusts the battery active material in the first tank body, thereby improving the temperature controllability of the battery active material in the first tank body, reducing the temperature difference between the battery active material in the first tank body and the battery active material coated on the surface of the substrate, and thus can effectively improve the coating quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The technical solution and other beneficial effects of the present application will be made apparent by describing in detail the specific implementation methods of the present application in conjunction with the accompanying drawings.

[0019] Figure 1 It is a schematic diagram of the structure of the coating device in the embodiment of the present application;

[0020] Figure 2 is a cross-sectional view of the first tank body and the second tank body in the embodiment of the present application;

[0021] Figure 3 is a schematic diagram of the controller in the embodiment of the present application being electrically connected to the temperature sensor, the first pump body, the second pump body and the temperature regulating device;

[0022] Figure 4 It is a cross-sectional schematic diagram of the thermal insulation layer wrapped around the third pipeline in the embodiment of the present application.

[0023] Explanation of reference numerals: 1-transfer roller; 2-substrate; 3-battery active material; 4-heat exchange medium; 10-first tank body; 110-temperature sensor; 121-first discharge port; 122-second feed port; 20-coating assembly; 210-first feed port; 30-second tank body; 310-bottom wall; 311-liquid inlet; 320-side wall; 321-liquid outlet; 330-top wall; 340-accommodating chamber; 40-temperature regulating device; 410-second liquid inlet; 420-second liquid outlet; 510-first valve; 520-second Two valves; 60-controller; 70-third tank body; 710-third feed port; 720-third discharge port; 810-first pipeline; 820-second pipeline; 830-third pipeline; 840-fourth pipeline; 850-fifth pipeline; 860-sixth pipeline; 870-seventh pipeline; 880-insulation layer; 910-first pump body; 920-second pump body; 930-third pump body; 931-fourth feed port; 932-fourth discharge port; 940-fourth pump body; 941-fifth feed port; 942-fifth discharge port. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and beneficial effects of this application more clear, the following further describes this application in detail in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific implementation methods described in this specification are only for explaining this application, not for limiting this application.

[0025] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" refers to two or more, unless otherwise clearly and specifically defined.

[0026] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0027] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0028] See also Figure 1 . Figure 1 It is a schematic diagram of the structure of the coating equipment in the embodiment of the present application. Figure 1 Thick solid lines are used to show pipelines used to transport materials to distinguish them from other lines.

[0029] A coating device is used to coat a battery active material 3 on a substrate 2 to form a battery pole piece. Specifically, according to the different polarities of the battery pole piece, the composition of the battery active material 3 is adjusted accordingly, and the material of the substrate 2 is also adjusted accordingly. The battery active material 3 is in a flowable state before coating, which can also be called a slurry. After the battery active material 3 is coated on the substrate 2, it undergoes a drying process, and the battery active material 3 is in a solid state and adheres to the surface of the substrate 2.

[0030] The coating device includes a first tank body 10 , a coating assembly 20 and a conveying roller 1 .

[0031] The first can body 10 is used to store the battery active material 3. The first can body 10 is provided with a first discharge port 121 and a second feed port 122.

[0032] Specifically, the first discharge port 121 is communicated with the cavity of the first tank body 10, and the first discharge port 121 is disposed at the bottom of the first tank body 10. The second feed port 122 is communicated with the cavity of the first tank body 10, and the second feed port 122 is disposed at the top of the first tank body 10. In other embodiments, the first discharge port 121 and the second feed port 122 may also be disposed at other parts of the first tank body 10 according to actual needs.

[0033] In some embodiments, a stirring device (not shown) is further provided in the first tank body 10 , and the stirring device makes the temperature of the battery active material 3 in the first tank body 10 more uniform, or the stirring device is used to break up and mix the raw materials to form the battery active material 3 .

[0034] The substrate 2 is wound around the conveying roller 1, and the conveying roller 1 is used to continuously convey the substrate 2. The substrate 2 is, for example, copper foil or aluminum foil.

[0035] The coating assembly 20 is provided with a first feed port 210, and the first feed port 210 is connected to the first discharge port 121. The connection herein can be a direct connection or an indirect connection. The coating assembly 20 is arranged corresponding to the conveying roller 1, and the coating assembly 20 is used to coat the battery active material 3 on the substrate 2 conveyed by the conveying roller 1.

[0036] In some embodiments, the coating device adopts an extrusion coating method (such as Figure 1 As shown in FIG. 2 , the coating assembly 20 includes a coating die head, and the coating die head is provided with a first feed port 210. The coating die head extrude and coat the battery active material 3 along the slit onto the moving substrate 2, and the coating uniformity and thickness are adjusted by the coating die head cavity structure and the slit width.

[0037] In other embodiments, the coating device adopts a transfer coating method (not shown), and the coating assembly 20 includes a coating roller, a trough plate, and a scraper. The trough plate is provided with a first feed port 210. The trough plate attaches the battery active material 3 to the surface of the coating roller, and the transfer amount of the battery active material 3 is controlled by adjusting the gap between the scraper and the coating roller. The coating roller and the conveying roller 1 rotate relative to each other in opposite directions, so that the coating roller transfers the battery active material 3 to the moving substrate 2 to form a coating.

[0038] The specific structure of the coating assembly 20 varies according to the coating method of the coating equipment. The coating assembly 20 can coat the battery active material 3 on the substrate 2 to form a coating layer, and the specific structure of the coating assembly 20 is not limited in the embodiment of the present application.

[0039] See also Figure 1 and Figure 2 . Figure 2 It is a cross-sectional view of the first tank body 10 and the second tank body 30 in the embodiment of the present application.

[0040] The coating device further includes a second tank body 30 and a temperature regulating device 40 .

[0041] The second tank body 30 includes a bottom wall 310 and a peripheral side wall 320. The peripheral side wall 320 is connected to the bottom wall 310. The bottom wall 310 and the peripheral side wall 320 are arranged to form a receiving cavity 340. The receiving cavity 340 is used to store the flowable heat exchange medium 4. The bottom wall 310 is provided with a first liquid inlet 311, and the peripheral side wall 320 is provided with a first liquid outlet 321. Among them, at least the bottom of the first tank body 10 is located in the receiving cavity 340.

[0042] Specifically, the bottom wall 310 is in a flat plate shape, and the peripheral side wall 320 is in a cylindrical shape and is disposed outside the first tank body 10. In other embodiments, the bottom wall 310 and the peripheral side wall 320 may also be in other shapes.

[0043] Specifically, the heat exchange medium 4 is, for example, water or oil.

[0044] At least the bottom of the first can body 10 is located in the accommodating cavity 340 , so that the heat exchange medium 4 can exchange heat with the battery active material 3 in the first can body 10 through the first can body 10 , thereby adjusting the temperature of the battery active material 3 in the first can body 10 by adjusting the temperature of the heat exchange medium 4 .

[0045] Further, the second tank body 30 further includes a top wall 330. The top wall 330 and the bottom wall 310 are arranged at intervals in the vertical direction. The top wall 330 is sleeved outside the first tank body 10. The peripheral side walls 320 are respectively connected between the top wall 330 and the bottom wall 310. The top wall 330 is sealedly connected to the first tank body 10. The top wall 330 and the peripheral side walls 320 are sealedly connected.

[0046] By providing the top wall 330, a closed hollow interlayer is formed between the second tank body 30 and the first tank body 10. The heat exchange medium 4 is accommodated in the hollow interlayer. The closed hollow interlayer can reduce the influence of the temperature of the heat exchange medium 4 on the outside, and at the same time, it is also more convenient for the heat exchange medium 4 to circulate between the second tank body 30 and the temperature regulating device 40.

[0047] The temperature regulating device 40 is provided with a second liquid inlet 410 and a second liquid outlet 420. The second liquid inlet 410 is connected to the first liquid outlet 321. The second liquid outlet 420 is connected to the first liquid inlet 311.

[0048] Specifically, the coating device further includes a first pipeline 810 and a second pipeline 820. One end of the first pipeline 810 is connected to the first liquid outlet 321, and the other end is connected to the second liquid inlet 410. One end of the second pipeline 820 is connected to the second liquid outlet 420, and the other end is connected to the first liquid inlet 311. In other embodiments, the second liquid inlet 410 may also be directly connected to the first liquid outlet 321, so that the first pipeline 810 does not need to be set. In other embodiments, the second liquid outlet 420 may also be directly connected to the first liquid inlet 311, so that the second pipeline 820 does not need to be set.

[0049] The temperature regulating device 40 is used to regulate the temperature of the heat exchange medium 4 flowing through the temperature regulating device 40. Specifically, the temperature regulating device 40 can selectively increase or decrease the temperature of the heat exchange medium 4.

[0050] In order to achieve the function of adjusting the temperature of the heat exchange medium 4, in some embodiments, the temperature regulating device 40 includes a heating component and a cooling component. The heating component is used to increase the temperature of the heat exchange medium 4 flowing through the temperature regulating device 40. For example, the heating component includes a resistance wire, and the resistance wire generates heat after being energized to heat the heat exchange medium 4. The cooling component is used to reduce the temperature of the heat exchange medium 4 flowing through the temperature regulating device 40. For example, the cooling component includes a heat exchange channel, and the heat exchange channel has a coolant to dissipate heat from the heat exchange medium 4.

[0051] In some embodiments, the heat exchange medium 4 in the second tank body 30 needs to be maintained within a predetermined temperature range, which is lower than the ambient temperature around the second tank body 30. Correspondingly, the temperature regulating device 40 only needs to have a heating function. When the temperature of the heat exchange medium 4 in the second tank body 30 is too low, the temperature regulating device 40 can heat the heat exchange medium 4.

[0052] The temperature control device 40 may be a conventional device.

[0053] Since the second tank body 30 is connected to the temperature regulating device 40, the heat exchange medium 4 can circulate between the second tank body 30 and the temperature regulating device 40. When the temperature of the heat exchange medium 4 at the temperature regulating device 40 changes, the heat exchange medium 4 in the second tank body 30 will naturally change accordingly. In order to improve the efficiency of the temperature regulating device 40 in adjusting the temperature of the heat exchange medium 4 in the second tank body 30, the coating device also includes a first pump body 910 and a second pump body 920. Along the conveying path from the first liquid outlet 321 to the second liquid inlet 410, the first pump body 910 is located at the downstream side of the first liquid outlet 321 and the upstream side of the second liquid inlet 410. The first pump body 910 is used to pump the heat exchange medium 4 in the second tank body 30 into the temperature regulating device 40. Along the conveying path from the second liquid outlet 420 to the first liquid inlet 311, the second pump body 920 is located at the downstream side of the second liquid outlet 420 and the upstream side of the first liquid inlet 311. The second pump body 920 is used to pump the heat exchange medium 4 in the temperature regulating device 40 into the second tank body 30 .

[0054] Specifically, when the first pipeline 810 is provided, the first pump body 910 is provided on the first pipeline 810 to drive the heat exchange medium 4 in the first pipeline 810 to flow. When the second pipeline 820 is provided, the second pump body 920 is provided on the second pipeline 820 to drive the heat exchange medium 4 in the second pipeline 820 to flow.

[0055] In some other embodiments, the first pump body 910 and the second pump body 920 may be selectively provided, that is, the coating device only includes the first pump body 910 or the second pump body 920 .

[0056] In some other embodiments, the first pump body 910 and the second pump body 920 may also be integrated with the temperature control device 40 .

[0057] In the embodiment of the present application, the second tank body 30 forms a storage cavity 340 for storing the heat exchange medium 4, and at least the bottom of the first tank body 10 is located in the second tank body 30. The heat exchange medium 4 in the second tank body 30 can transfer heat with the battery active material 3 in the first tank body 10, and adjust the temperature of the battery active material 3 in the first tank body 10. The temperature regulating device 40 adjusts the temperature of the heat exchange medium 4, and then adjusts the battery active material 3 in the first tank body 10, thereby improving the temperature controllability of the battery active material 3 in the first tank body 10, and thus can improve the coating quality.

[0058] Since the heat exchange medium 4 circulates between the temperature regulating device 40 and the second tank body 30, if the first liquid inlet 311 is set above the first liquid outlet 321, the heat exchange medium 4 flowing into the first liquid inlet 311 moves quickly to the first liquid outlet 321 under the action of its own gravity, and cannot be fully mixed with the heat exchange medium 4 in the second tank body 30, resulting in low efficiency in regulating the temperature of the heat exchange medium 4 in the second tank body 30. In the embodiment of the present application, the first liquid inlet 311 is set below the first liquid outlet 321, which can reduce the speed of the heat exchange medium 4 flowing into the first liquid inlet 311 moving to the first liquid outlet 321, thereby increasing the degree of mixing with the heat exchange medium 4 in the second tank body 30, and further increasing the efficiency of regulating the temperature of the heat exchange medium 4 in the second tank body 30. Further, the first liquid inlet 311 is set on the bottom wall 310, and the first liquid outlet 321 is set on the peripheral side wall 320, which can further improve the efficiency of regulating the temperature of the heat exchange medium 4 in the second tank body 30.

[0059] The battery active material 3 in the first tank body 10 has a first liquid level, and the heat exchange medium 4 in the second tank body 30 has a second liquid level. When the second liquid level is greater than the first liquid level, compared with the case where the second liquid level is equal to the first liquid level, the efficiency of adjusting the temperature of the battery active material 3 in the first tank body 10 does not change significantly, but the heat loss of the heat exchange medium 4 in the second tank body 30 increases significantly. When the second liquid level is less than the first liquid level, compared with the case where the second liquid level is equal to the first liquid level, the efficiency of adjusting the temperature of the battery active material 3 in the first tank body 10 is significantly reduced. In order to improve the efficiency of adjusting the temperature of the battery active material 3 in the first tank body 10 and reduce the heat loss of the heat exchange medium 4 in the second tank body 30, in some embodiments, the second liquid level is consistent with the first liquid level.

[0060] Specifically, the top surface of the heat exchange medium 4 in the second tank body 30 is flush with the lower edge of the hole wall of the first liquid outlet 321. The height of the first tank body 10 is D1 cm, the distance between the lower edge of the hole wall of the first liquid outlet 321 and the top of the first tank body 10 is D2 cm, and the distance between the top surface of the battery active material 3 in the first tank body 10 and the top of the first tank body 10 is D3 cm, satisfying: 0.08*D1≤D3≤0.15*D1, 0.08*D1≤D2≤0.15*D1.

[0061] In one embodiment, D1 is 100, and correspondingly, 8≤D2≤15. D2 may be 8, 10, 12, 13 or 15.

[0062] In one embodiment, D1 is 200, and correspondingly, 16≤D2≤30. D2 may be 16, 20, 24, 26 or 30.

[0063] In a detection scenario, a tape measure is used to detect the above D1 , D2 , and D3 .

[0064] The following examples change D1 and D2 to observe the heat preservation effect of the battery active material 3 and the heat loss rate of the heat exchange medium 4. The results are shown in Table 1. The temperature measurement method is as follows: the temperature measurement probe of the first tank 10 measures the temperature of the battery active material 3 (reading on the display screen of the first tank 10). The heat loss rate of the heat exchange medium 4 is measured by recording the power consumption per hour of the temperature control system. The higher the power consumption, the higher the heat loss rate of the heat exchange medium 4.

[0065] Table 1

[0066]

[0067] It can be seen from Table 1 that in Examples 5 and 10, when D2 reaches 0.3*D1, the temperature of the battery active material 3 is lower than 25°C, and there is still a large temperature difference from 30°C, which makes it difficult to meet the appropriate temperature required for coating the battery active material 3; and when D2<0.08*D1, the heat exchange medium 4 has a large heat loss rate. Comprehensive analysis shows that when 0.08*D1≤D2≤0.15*D1, there is a better thermal insulation effect of the battery active material 3 and a smaller heat loss rate of the heat exchange medium 4.

[0068] Please also read Figure 3 . Figure 3 It is a schematic diagram of the controller 60 being electrically connected to the temperature sensor 110 , the first pump body 910 , the second pump body 920 , and the temperature regulating device 40 in the embodiment of the present application.

[0069] In some embodiments, the coating device further includes a temperature sensor 110 and a controller 60. At least a portion of the temperature sensor 110 extends into the first tank 10. The controller 60 is electrically connected to the temperature sensor 110 and the temperature control device 40, respectively. Specifically, when the coating device includes a first pipeline 810, a second pipeline 820, a first pump body 910, and a second pump body 920, the controller 60 is also electrically connected to the first pump body 910, the second pump body 920, and the temperature control device 40, respectively.

[0070] The temperature sensor 110 is used to detect the temperature of the battery active material 3 in the first tank body 10. The controller 60 is used to control the operation of the temperature regulating device 40, the first pump body 910 and the second pump body 920 according to the temperature of the battery active material 3 in the first tank body 10. For example, the temperature sensor 110 detects the temperature of the battery active material 3 in the first tank body 10 in real time and feeds back to the controller 60 in real time. When the temperature of the battery active material 3 in the first tank body 10 is lower than the preset temperature range, the controller 60 controls the first pump body 910 and the second pump body 920 to start, and controls the temperature regulating device 40 to heat the heat exchange medium 4 flowing through the temperature regulating device 40. When the temperature of the battery active material 3 in the first tank body 10 is within the preset temperature range, the controller 60 controls the first pump body 910 and the second pump body 920 to stop, and controls the temperature regulating device 40 to stop. When the temperature of the battery active material 3 in the first tank 10 is higher than the preset temperature range, the controller 60 controls the first pump 910 and the second pump 920 to start, and controls the temperature regulating device 40 to reduce the temperature of the heat exchange medium 4 flowing through the temperature regulating device 40 .

[0071] See also Figure 1 . In some embodiments, the second feed port 122 is connected to the first feed port 121. The coating device further includes a first valve 510 and a second valve 520. Along the conveying path from the first feed port 121 to the first feed port 210, the first valve 510 is disposed on the downstream side of the first feed port 121 and the upstream side of the first feed port 210. The first valve 510 is used to selectively open or block the first feed port 121 and the first feed port 210. Along the conveying path from the first feed port 121 to the second feed port 122, the second valve 520 is disposed on the downstream side of the first feed port 121 and the upstream side of the second feed port 122. The second valve 520 is used to selectively open or block the first feed port 121 and the second feed port 122. Among them, along the conveying path from the first feed port 121 to the first feed port 210, the second valve 520 is disposed on the upstream side of the first valve 510.

[0072] Specifically, in some embodiments, the first valve 510 and the second valve 520 are solenoid valves. In an embodiment where the coating device includes a controller 60, the first valve 510 and the second valve 520 can be electrically connected to the controller 60. The controller 60 controls the first valve 510 and the second valve 520 to operate.

[0073] During normal coating, the second valve 520 is in a closed state and blocks the first outlet 121 and the second feed port 122, and the first valve 510 is in an open state and connects the first outlet 121 and the first feed port 210. The battery active material 3 in the first tank 10 can be transported to the coating assembly 20.

[0074] When coating is stopped, the first valve 510 is in a closed state and blocks the first outlet 121 and the first feed port 210, and the second valve 520 is in an open state and connects the first feed port 210 and the second feed port 122. The battery active material 3 in the first tank body 10 can be transported back to the first tank body 10. Thus, the circulation of the battery active material 3 can be achieved, and the temperature of the battery active material 3 is always within a predetermined range.

[0075] See also Figure 1 In some embodiments, the coating device further includes a third tank body 70, a third pump body 930 and a fourth pump body 940. The third tank body 70 is provided with a third feed port 710 and a third discharge port 720, the third feed port 710 is connected to the first discharge port 121, and the third discharge port 720 is connected to the first feed port 210. The third pump body 930 is located on the downstream side of the first discharge port 121 and the upstream side of the third feed port 710 along the conveying path from the first discharge port 121 to the third feed port 710. The third pump body 930 is used to drive the battery active material 3 in the first tank body 10 to be pumped into the third tank body 70. The fourth pump body 940 is located on the downstream side of the third discharge port 720 and the upstream side of the first feed port 210 along the conveying path from the third discharge port 720 to the first feed port 210. The fourth pump body 940 is used to pump the battery active material 3 in the third tank body 70 into the coating assembly 20. Wherein, along the conveying path from the third outlet 720 to the first feed inlet 210, the second valve 520 is located at the downstream side of the fourth pump body 940 and the upstream side of the first valve 510.

[0076] In this embodiment, no matter in normal coating or coating stop, the third pump body 930 and the fourth pump body 940 are always started to pump the battery active material 3 .

[0077] See also Figure 1. In some embodiments, the third pump body 930 is provided with a fourth feed port 931 and a fourth discharge port 932. The fourth pump body 940 is provided with a fifth feed port 941 and a fifth discharge port 942. The coating device further includes a third pipeline 830, a fourth pipeline 840, a fifth pipeline 850, a sixth pipeline 860 and a seventh pipeline 870. One end of the third pipeline 830 is connected to the first discharge port 121, and the other end is connected to the fourth feed port 931. One end of the fourth pipeline 840 is connected to the fourth discharge port 932, and the other end is connected to the third feed port 710. One end of the fifth pipeline 850 is connected to the third discharge port 720, and the other end is connected to the fifth feed port 941. One end of the sixth pipeline 860 is connected to the fifth discharge port 942, and the other end is connected to the first feed port 210. One end of the seventh pipeline 870 is connected to the sixth pipeline 860, and the other end is connected to the second feed port 122. The first valve 510 is disposed on the sixth pipeline 860 and is located at the downstream side of the connection between the seventh pipeline 870 and the sixth pipeline 860. The first valve 510 is used to selectively open or block the sixth pipeline 860. The second valve 520 is disposed on the seventh pipeline 870 and is used to selectively open or block the seventh pipeline 870.

[0078] The longer the pipeline for transporting the battery active material 3, the greater the temperature change of the battery active material 3 in the pipeline under the influence of the external environment. The shorter the pipeline for transporting the battery active material 3, the greater the difficulty of assembling the coating equipment. Taking all factors into consideration, in some embodiments, the lengths of the third pipeline 830, the fourth pipeline 840, the fifth pipeline 850, and the sixth pipeline 860 are all within the range of 1m to 3m, and the length of the seventh pipeline 870 is within 10m.

[0079] Specifically, the lengths of the third pipeline 830, the fourth pipeline 840, the fifth pipeline 850 and the sixth pipeline 860 may be 1m, 1.5m, 1.8m, 2m, 2.5m or 3m. The length of the seventh pipeline 870 may be 3m, 5m, 7m, 9m or 10m.

[0080] The lengths of the third pipeline 830, the fourth pipeline 840, the fifth pipeline 850 and the sixth pipeline 860 are changed through multiple embodiments to observe the length of pipeline installation and the insulation effect of the battery active material 3. In the embodiment, D1 and D2 are set with reference to Example 7, and the results are shown in Table 2. Among them, the measurement method of pipeline length: measurement with a tape measure. The measurement method of temperature: the temperature of the battery active material 3 is measured by the temperature measurement probe of the first tank body 10 (the reading is on the display screen of the first tank body 10). Pipeline installation time: the pipeline installation time is counted.

[0081] Table 2

[0082]

[0083] According to the data in Table 2, it can be seen that as the length of each pipeline becomes longer, the installation time will become longer, that is, the installation difficulty will increase, which will increase the installation difficulty in the limited space of the coating equipment or coating workshop.

[0084] See also Figure 4 . Figure 4 It is a cross-sectional schematic diagram of the third pipeline 830 wrapped with the thermal insulation layer 880 in the embodiment of the present application.

[0085] In some embodiments, an outer surface of at least one of the third pipeline 830 , the fourth pipeline 840 , the fifth pipeline 850 , the sixth pipeline 860 , and the seventh pipeline 870 is coated with a heat insulation layer 880 .

[0086] Specifically, the outer surfaces of the third pipeline 830, the fourth pipeline 840, the fifth pipeline 850, the sixth pipeline 860 and the seventh pipeline 870 are all covered with a heat insulation layer 880. The heat insulation layer 880 is made of heat insulation cotton or heat insulation glue.

[0087] The following examples change the outer diameter of the pipeline and the thickness of the thermal insulation layer 880 to observe the insulation effect and cost increase of the thermal insulation layer 880. In the examples, D1 and D2 are set according to Example 7, and the length of each pipeline is set according to Example 12. The results are shown in Table 3. Among them, the outer diameter of the pipeline is measured by a vernier caliper; the thickness t of the thermal insulation layer 880 is measured by a soft ruler. The temperature of the battery active material 3 is measured by the temperature measurement probe of the first tank body 10 (the reading is on the display screen of the first tank body 10).

[0088] Table 3

[0089]

[0090] It can be seen from Table 3 that by providing the thermal insulation layer 880, the influence of the external environment on the temperature of the battery active material 3 in the pipeline can be reduced. The thicker the thermal insulation layer 880 is, the better the thermal insulation effect is. At the same time, the cost of the thermal insulation layer 880 will also increase. In addition, the thermal insulation layer 880 also occupies space. In some embodiments, the thickness t of the thermal insulation layer 880 is in the range of 0.5 cm to 2 cm. In combination with the temperature control device 40 and the seventh pipeline 870, the thickness of the thermal insulation layer 880 can be reduced to less than 2 cm, effectively reducing the cost of the coating equipment.

[0091] In summary, the coating device provided in the embodiment of the present application can improve the temperature controllability of the battery active material 3, thereby improving the coating quality.

[0092] The introduction provided in the above steps is only used to help understand the structure and core ideas of the present application. For ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A coating device, characterized in that: include: A first tank body, used for storing battery active materials, wherein the first tank body is provided with a first discharge port; A coating component, provided with a first feed inlet, the first feed inlet is connected to the first discharge port, and the coating component is used to coat the battery active material on a substrate; a second tank body, the second tank body comprising a bottom wall and a peripheral side wall, the peripheral side wall being connected to the bottom wall, the bottom wall and the peripheral side wall forming a containing cavity, the containing cavity being used to store a flowable heat exchange medium, at least the bottom of the first tank body being located in the containing cavity, the bottom wall being provided with a first liquid inlet, and the peripheral side wall being provided with a first liquid outlet; The temperature regulating device is provided with a second liquid inlet and a second liquid outlet, wherein the second liquid inlet is connected to the first liquid outlet, and the second liquid outlet is connected to the first liquid inlet, and the temperature regulating device is used to regulate the temperature of the heat exchange medium flowing through the temperature regulating device.

2. The coating device according to claim 1, characterized in that: The first tank body is provided with a second feed inlet, and the second feed inlet is connected to the first discharge outlet; The coating device also includes: A first valve, along the conveying path from the first discharge port to the first feed port, the first valve is arranged on the downstream side of the first discharge port and the upstream side of the first feed port, the first valve is used to selectively open or block the first discharge port and the first feed port; A second valve, along the conveying path from the first discharge port to the second feed port, the second valve is arranged on the downstream side of the first discharge port and the upstream side of the second feed port, the second valve is used to selectively open or block the first discharge port and the second feed port; Wherein, along the conveying path from the first discharge port to the first feed port, the second valve is arranged on the upstream side of the first valve.

3. The coating device according to claim 1, characterized in that: Also includes: a first pipeline, one end of which is connected to the first liquid outlet, and the other end of which is connected to the second liquid inlet; and / or A second pipeline, one end of the second pipeline is connected to the second liquid outlet, and the other end is connected to the first liquid inlet.

4. The coating device according to claim 1, characterized in that: Also includes: a first pump body, the first pump body being used to pump the heat exchange medium in the second tank body into the temperature regulating device; and / or A second pump body is used to pump the heat exchange medium in the temperature regulating device into the second tank body.

5. The coating device according to claim 1, characterized in that: The height of the first tank body is D1 cm, and the distance between the lower edge of the hole wall of the first liquid outlet and the top of the first tank body is D2 cm, satisfying: 0.08*D1≤D2≤0.15*D1.

6. The coating device according to claim 1, characterized in that: Also includes: a temperature sensor, at least partially extending into the first tank; The controller is electrically connected to the temperature sensor and the temperature regulating device respectively.

7. The coating device according to claim 2, characterized in that: Also includes: A third tank body is provided with a third feed port and a third discharge port, wherein the third feed port is connected to the first discharge port, and the third discharge port is connected to the first feed port; a third pump body, the third pump body being used to pump the battery active material in the first tank body into the third tank body; a fourth pump body, the fourth pump body being used to pump the battery active material in the third tank body into the coating assembly; Wherein, along the conveying path from the third discharge port to the first feed port, the second valve is located on the downstream side of the fourth pump body and on the upstream side of the first valve.

8. The coating device according to claim 7, characterized in that: The third pump body is provided with a fourth feed inlet and a fourth discharge outlet; The fourth pump body is provided with a fifth feed inlet and a fifth discharge outlet; The coating device also includes: a third pipeline, one end of the third pipeline being connected to the first discharge port, and the other end of the third pipeline being connected to the fourth feed port; a fourth pipeline, one end of which is connected to the fourth discharge port, and the other end of which is connected to the third feed port; a fifth pipeline, one end of which is connected to the third outlet, and the other end of which is connected to the fifth inlet; a sixth pipeline, one end of which is connected to the fifth discharge port, and the other end of which is connected to the first feed port; a seventh pipeline, one end of which is connected to the sixth pipeline, and the other end of which is connected to the second feed port; Among them, the first valve is arranged on the sixth pipeline and is located on the downstream side of the connection between the seventh pipeline and the sixth pipeline. The first valve is used to selectively open or block the sixth pipeline. The second valve is arranged on the seventh pipeline and is used to selectively open or block the seventh pipeline.

9. The coating device according to claim 8, characterized in that: The lengths of the third pipeline, the fourth pipeline, the fifth pipeline and the sixth pipeline are all within the range of 1m to 3m, and the length of the seventh pipeline is within 10m.

10. The coating device according to claim 8, characterized in that: An outer surface of at least one of the third pipeline, the fourth pipeline, the fifth pipeline, the sixth pipeline and the seventh pipeline is covered with a heat insulation layer, and a thickness of the heat insulation layer is in a range of 0.5 cm to 2 cm.

Images