Coating device, pole piece and battery cell production equipment

Abstract

The utility model relates to a coating device, a pole piece and battery cell production equipment, and belongs to the technical field of battery manufacturing. The coating device comprises a transfer tank, a transfer screw pump, a buffer tank, a feeding screw pump and a die head which are sequentially connected, the coating device further comprises a control device, a first pressure sensor is arranged on a pipeline between the buffer tank and an inlet of the feeding screw pump, the die head is provided with a third pressure sensor, and the third pressure sensor is connected with the transfer tank. The control device is in signal connection with the transfer screw pump, the feeding screw pump, the first pressure sensor and the third pressure sensor. Due to the fact that the fluctuation amplitude of the cavity pressure of the die head can be reduced in the coating process, the fluctuation amplitude of the surface density of the active substance of the pole piece is reduced, and the coating uniformity of the pole piece is guaranteed. The utility model further provides pole piece production equipment which comprises the coating device. The utility model further provides battery cell production equipment which comprises the pole piece production equipment.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, and more specifically, to a coating apparatus, electrode sheet, and cell production equipment. Background Technology

[0002] With the rapid development of the new energy field, lithium batteries have advantages such as high energy density, high voltage, and environmental friendliness. In recent years, they have gradually replaced the traditional energy industry, and the manufacturing level has developed rapidly, which puts forward higher requirements for the preparation process of electrode sheets.

[0003] In the preparation of electrode sheets, active materials are uniformly coated onto the surface of foil using a coating device's die head. After drying in an oven, the foil is shaped and then wound into a coil electrode sheet. However, during the continuous feeding of the die head, various factors may cause fluctuations in the cavity pressure of the die head, resulting in fluctuations in the areal density of the active materials in the electrode sheet. This reduces the coating uniformity of the electrode sheet, leading to poor capacity consistency in the battery cell. Utility Model Content

[0004] Therefore, this application proposes a coating device, an electrode sheet, and a battery cell production equipment, which can reduce the fluctuation range of the cavity pressure of the die head during the coating process, thereby reducing the fluctuation range of the areal density of the active material of the electrode sheet and ensuring the coating uniformity of the electrode sheet.

[0005] The coating apparatus of the first aspect of this application includes a transfer tank, a transfer screw pump, a buffer tank, a feed screw pump and a die head connected in sequence. The coating apparatus also includes a control device. A first pressure sensor is provided on the pipe between the inlet of the buffer tank and the inlet of the feed screw pump. A third pressure sensor is provided on the die head. The control device is signal connected to the transfer screw pump, the feed screw pump, the first pressure sensor and the third pressure sensor.

[0006] Initial coating stage: The control device is configured to control the feed screw pump to rotate at an increased speed until the cavity pressure of the die head detected by the third pressure sensor reaches a preset value P. 3设定 It enters the continuous production stage;

[0007] Continuous production phase: The control device is configured to control the intermediate screw pump to change its rotational speed according to the pressure detected by the first pressure sensor, so that the detection value of the first pressure sensor is maintained within a preset range P. 1设定 .

[0008] Optionally, the buffer tank is equipped with a level sensor, and the control device is signal-connected to the level sensor. When the level sensor detects that the slurry level in the buffer tank exceeds a threshold L, the control device will respond accordingly. maxAt that time, the control device is configured to control the transfer screw pump to stop pumping material into the buffer tank.

[0009] Optionally, the coating apparatus further includes a first alarm element, and the control device is signal-connected to the first alarm element. When the level sensor detects that the slurry level in the buffer tank exceeds a threshold L, the control device will activate the alarm. max At that time, the control device is configured to control the first warning element to issue a warning signal.

[0010] Optionally, the coating apparatus further includes a viscosity adjustment module disposed on the pipeline between the feed screw pump and the die head, for adjusting the viscosity of the slurry.

[0011] Optionally, the viscosity adjustment module includes a viscometer, a heat exchanger, and a mold temperature controller. The viscometer is installed on the pipeline between the feed screw pump and the heat exchanger. The heat exchanger is connected to the mold head. The control device is signal-connected to both the viscometer and the mold temperature controller. The heat exchanger is used to heat the slurry to change its viscosity. The mold temperature controller is used to provide a heating medium to the heat exchanger. The control device is configured to change the temperature of the heating medium according to the viscosity of the slurry detected by the viscometer.

[0012] Optionally, a second pressure sensor is provided on the outlet side of the feed screw pump, and the control device is signal-connected to the second pressure sensor. When the pressure of the slurry detected by the second pressure sensor exceeds a threshold P... 2max At that time, the control device is configured to control the feed screw pump to stop pumping material to the die head.

[0013] Optionally, the coating apparatus further includes a second alarm element, and the control device is signal-connected to the second alarm element. When the pressure of the slurry detected by the second pressure sensor exceeds a threshold P... 2max At that time, the control device is configured to control the second warning element to issue a warning signal.

[0014] Optionally, a feed valve is provided on the pipeline between the transfer screw pump and the buffer tank to open or close the pipeline between the transfer screw pump and the buffer tank.

[0015] The electrode production equipment according to the second aspect of this application includes: a current collector conveying device for conveying current collectors; and a coating device according to the first aspect of this application for coating an active substance onto the surface of the current collector.

[0016] The battery cell manufacturing equipment according to the third aspect of this application includes: two electrode manufacturing devices as described in the second aspect of this application, respectively used to provide positive electrode and negative electrode; a separator providing device for providing a separator; and a battery cell preparation device for winding the stacked positive electrode, separator and negative electrode to form a battery cell; or, stacking the positive electrode, separator and negative electrode to form a battery cell.

[0017] Compared with existing technologies, this solution has the following advantages:

[0018] The coating apparatus of this application embodiment is equipped with a first pressure sensor and a third pressure sensor. During the initial coating stage, the value change of the third pressure sensor is continuously monitored, and the rotation speed of the feed screw pump is adjusted accordingly to quickly increase the cavity pressure of the die head and enter the continuous production stage. During the continuous production stage, the value change of the first pressure sensor is continuously monitored, and the rotation speed of the transfer screw pump is adjusted accordingly to maintain the cavity pressure of the die head within a constant range, thereby reducing the fluctuation range of the cavity pressure of the die head. When the coating apparatus is applied to the preparation of electrode sheets, the areal density fluctuation range of the active material of the electrode sheet can be reduced, ensuring the coating uniformity of the electrode sheet.

[0019] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the coating apparatus provided in the embodiments of this application;

[0022] Figure 2 A schematic diagram of the working principle of the control device for the coating apparatus provided in the embodiments of this application;

[0023] Figure 3 A schematic diagram of the electrode production equipment provided in the embodiments of this application;

[0024] Figure 4 A schematic diagram of the battery cell production equipment provided in the embodiments of this application.

[0025] Icons: 100-Coating device; 110-Transfer tank; 120-Transfer screw pump; 130-Buffer tank; 131-Level sensor; 132-Feed valve; 133-First alarm element; 140-Feeding screw pump; 141-First pressure sensor; 142-Second pressure sensor; 143-Second alarm element; 150-Die head; 151-Third pressure sensor; 160-Viscosity adjustment module; 161-Viscometer; 162-Heat exchanger; 163-Die temperature controller; 170-Control device; 200-Electrode production equipment; 210-Current collector conveying device; 300-Cell production equipment; 310-Diaphragm supply device; 320-Cell preparation device. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0028] like Figure 1 and Figure 2 As shown, the coating apparatus 100 of some embodiments of this application includes a transfer tank 110, a transfer screw pump 120, a buffer tank 130, a feed screw pump 140, and a die head 150 connected in sequence. The coating apparatus 100 also includes a control device 170. A first pressure sensor 141 is provided on the pipe between the inlet of the buffer tank 130 and the inlet of the feed screw pump 140, and a third pressure sensor 151 is provided on the die head 150. The control device 170 is signal-connected to the transfer screw pump 120, the feed screw pump 140, the first pressure sensor 141, and the third pressure sensor 151.

[0029] Initial coating stage: Control device 170 is configured to control the feed screw pump 140 to increase its rotation speed until the cavity pressure of the die head 150 detected by the third pressure sensor 151 reaches the preset value P. 3设定 Entering the continuous production stage; Continuous production stage: Control device 170 is configured to control the intermediate screw pump 120 to change its rotational speed according to the pressure detected by the first pressure sensor 141, so that the detection value of the first pressure sensor 141 is maintained within a preset range P. 1设定 .

[0030] The coating device 100 can be used to prepare electrode sheets, providing raw materials for lithium batteries; the coating device 100 can also be used in other occasions where material coating is required on the surface of the strip. The transfer tank 110 is used to store slurry, and the slurry is continuously stirred inside by a stirring blade to prevent solidification; the buffer tank 130 is connected to the outlet of the transfer tank 110 and is used to buffer the slurry that is about to be pumped into the die head 150; a transfer screw pump 120 is installed on the pipeline between the transfer tank 110 and the buffer tank 130, and a feed screw pump 140 is installed on the pipeline between the buffer tank 130 and the die head 150 to realize the transportation of slurry between different devices.

[0031] The initial coating stage refers to the period from the start of pumping material from the feed screw pump 140 to the die head 150, during which the cavity pressure of the die head 150 rapidly increases to the preset range P. 1设定 The process is as follows. It is understandable that the stability of the cavity pressure of the die head 150 is a core factor affecting the longitudinal areal density of the coating, while the pumping stability of the feed screw pump 140 to the die head 150 is a core factor affecting the stability of the cavity pressure of the die head 150. Therefore, by using a third pressure sensor 151 to detect changes in the cavity pressure of the die head 150 and using the cavity pressure value of the die head 150 as feedback to adjust the feed screw pump 140, the stability of the longitudinal areal density of the coating in the initial coating stage can be effectively controlled.

[0032] The continuous production stage refers to the stage where the cavity pressure of the die head 150 is increased to a preset range P. 1设定 Next, the active material is coated onto the surface of the current collector through the die head 150. It is understood that after entering the continuous production stage, the rotational speed of the feed screw pump 140 can be reduced to a preset constant value, continuously and stably pumping slurry into the die head 150. The volume of slurry in the buffer tank 130 is proportional to the inlet pressure of the feed screw pump 140, while the volume of slurry in the buffer tank 130 is proportional to the rotational speed of the transfer screw pump 120. Therefore, the inlet pressure of the feed screw pump 140 can be detected by the first pressure sensor 141, and the inlet pressure of the feed screw pump 140 can be used as the basis for adjusting the rotational speed of the transfer screw pump 120. By adjusting the rotational speed of the transfer screw pump 120, the inlet pressure value of the feed screw pump 140 is changed, maintaining the cavity pressure of the die head 150 within a preset range, thereby effectively controlling the stability of the longitudinal surface density of the coating during the continuous production stage.

[0033] The coating apparatus 100 of this application embodiment is equipped with a first pressure sensor 141 and a third pressure sensor 151. During the initial coating stage, the value change of the third pressure sensor 151 is continuously monitored, and the rotation speed of the feed screw pump 140 is adjusted accordingly to quickly increase the cavity pressure of the die head 150 and enter the continuous production stage. During the continuous production stage, the value change of the first pressure sensor 141 is continuously monitored, and the rotation speed of the transfer screw pump 120 is adjusted accordingly to maintain the cavity pressure of the die head 150 within a constant range, thereby reducing the fluctuation range of the cavity pressure of the die head 150. When the coating apparatus 100 is applied to the preparation of electrode sheets, the areal density fluctuation range of the active material of the electrode sheet can be reduced, ensuring the coating uniformity of the electrode sheet.

[0034] In some embodiments of this application, the buffer tank 130 is equipped with a level sensor 131, and the control device 170 is signal-connected to the level sensor 131. When the level sensor 131 detects that the level of the slurry in the buffer tank 130 exceeds a threshold L... max At this time, the control device 170 is configured to control the transfer screw pump 120 to stop pumping material to the buffer tank 130.

[0035] This configuration allows for timely shutdown of the transfer screw pump 120, ensuring that the slurry level in the buffer tank 130 does not exceed the threshold L. max To prevent slurry from overflowing from the buffer tank 130.

[0036] In some embodiments of this application, the coating apparatus 100 further includes a first alarm element 133, and the control device 170 is signal-connected to the first alarm element 133. When the level sensor 131 detects that the level of the slurry in the buffer tank 130 exceeds a threshold L... max At that time, the control device 170 is configured to control the first alarm element 133 to issue an alarm signal.

[0037] The first warning element 133 can be a signal light, an audible alarm device, etc., installed on the outer shell of the buffer tank 130, or the warning signal can be displayed through a display terminal; if the feedback adjustment between the transfer screw pump 120 and the control device 170 fails, it may not be able to stop in time, thus continuing to pump material into the buffer tank 130.

[0038] This setup allows staff to be alerted when the slurry level in buffer tank 130 exceeds the threshold L. max This allows for timely maintenance and reduces losses caused by operational abnormalities.

[0039] In some embodiments of this application, the coating apparatus 100 further includes a viscosity adjustment module 160, which is disposed on the pipeline between the feed screw pump 140 and the die head 150, for adjusting the viscosity of the slurry.

[0040] Understandably, the viscosity of the slurry can significantly affect its flowability and the outlet pressure of the feed screw pump 140, thereby affecting the pumping stability of the feed screw pump 140.

[0041] This configuration allows for adjustment of the viscosity of the slurry entering the die head 150, enabling the feed screw pump 140 to pump the slurry stably.

[0042] In some embodiments of this application, the viscosity adjustment module 160 includes a viscometer 161, a heat exchanger 162, and a mold temperature controller 163. The viscometer 161 is disposed on the pipeline between the feed screw pump 140 and the heat exchanger 162. The heat exchanger 162 is connected to the mold head 150. The control device 170 is signal-connected to both the viscometer 161 and the mold temperature controller 163. The heat exchanger 162 is used to heat the slurry to change its viscosity. The mold temperature controller 163 is used to provide a heating medium to the heat exchanger 162. The control device 170 is configured to change the temperature of the heating medium according to the viscosity of the slurry detected by the viscometer 161.

[0043] Adjusting the viscosity of a slurry by changing its temperature is not only easy to implement, but also allows for high precision.

[0044] In other embodiments, the viscosity of the slurry can also be changed by setting up a mixing tank or the like.

[0045] In some embodiments of this application, a second pressure sensor 142 is provided on the outlet side of the feed screw pump 140, and the control device 170 is signal-connected to the second pressure sensor 142. When the pressure of the slurry detected by the second pressure sensor 142 exceeds the threshold P, 2max At this time, the control device 170 is configured to control the feed screw pump 140 to stop pumping material to the die head 150.

[0046] This configuration allows for timely shutdown of the feed screw pump 140, preventing excessive pressure in the die head 150 cavity due to excessive outlet pressure of the feed screw pump 140, which could lead to a sudden change in coating density.

[0047] In some embodiments of this application, the coating apparatus 100 further includes a second alarm element 143, and the control device 170 is signal-connected to the second alarm element 143. When the pressure of the slurry detected by the second pressure sensor 142 exceeds the threshold P, the control device 170 is activated. 2max At that time, the control device 170 is configured to control the second warning element 143 to issue a warning signal.

[0048] The second warning element 143 can be a signal light, an audible alarm device, etc., installed on the housing of the feed screw pump 140, or the warning signal can be displayed through a display terminal; if the feedback adjustment between the feed screw pump 140 and the control device 170 fails, it may not be able to stop in time, thus continuing to pump material into the die head 150.

[0049] This configuration allows the operator to be alerted when the outlet pressure of the feed screw pump 140 exceeds the threshold P. 2max This allows for timely maintenance and reduces losses caused by operational abnormalities.

[0050] In some embodiments of this application, a feed valve 132 is provided on the pipeline between the transfer screw pump 120 and the buffer tank 130 for switching the pipeline between the transfer screw pump 120 and the buffer tank 130 on and off.

[0051] The feed valve 132 can be a mechanical valve or a solenoid valve that is connected to the control device 170 via a signal.

[0052] By setting the feed valve 132, the pipeline between the transfer screw pump 120 and the buffer tank 130 can be connected or disconnected, thereby improving the overall safety performance of the coating device 100.

[0053] like Figure 3 As shown, some embodiments of the electrode production equipment 200 of this application include a current collector conveying device 210 and a coating device 100. The current collector conveying device 210 is used to convey the current collector, and the coating device 100 is used to coat the surface of the current collector with an active material.

[0054] Electrodes are formed by coating the surface of the current collector with active material. By controlling the stability and uniformity of the coating density of the active material on the surface of the current collector, the quality pass rate of the electrode can be improved.

[0055] Due to the characteristics of the coating apparatus 100 in this application embodiment, the coating quality of the current collector can be improved, and the electrode production equipment 200 in this application embodiment can also improve the production quality of the electrode.

[0056] like Figure 4 As shown, the battery cell manufacturing apparatus 300 of some embodiments of this application includes two electrode manufacturing apparatuses 200, a separator providing device 310, and a battery cell preparation apparatus 320. The two electrode manufacturing apparatuses 200 are respectively used to provide positive electrode sheets and negative electrode sheets; the separator providing device 310 is used to provide a separator; the battery cell preparation apparatus 320 is used to wind the stacked positive electrode sheets, separator, and negative electrode sheets to form a battery cell, or to stack the positive electrode sheets, separator, and negative electrode sheets to form a battery cell.

[0057] Due to the characteristics of the coating apparatus 100 in this embodiment, the battery cell production equipment 300 in this embodiment uses two electrode production equipment 200 to provide positive electrode and negative electrode respectively. The electrode production equipment 200 has better electrode production quality, thereby achieving a better battery cell qualification rate in the battery cell production equipment 300.

[0058] The coating method of the coating apparatus 100 in this application embodiment includes:

[0059] S100 Coating Stage: The feed screw pump 140 is configured to rotate at an increased speed until the cavity pressure of the die head 150 detected by the third pressure sensor 151 reaches the preset value P. 3设定 It enters the continuous production stage;

[0060] S200 Continuous Production Stage: The intermediate screw pump 120 is configured to change its rotational speed according to the pressure detected by the first pressure sensor 141, so that the detection value of the first pressure sensor 141 is maintained at a preset value P. 1设定 .

[0061] The coating method described in this application involves adjusting the rotation speed of the feed screw pump 140 by detecting changes in the value of the third pressure sensor 151 during the initial coating stage, and adjusting the rotation speed of the transfer screw pump 120 by detecting changes in the value of the first pressure sensor 141 during continuous production. The feed screw pump 140 is rapidly accelerated during the initial coating stage to quickly increase the cavity pressure of the die head 150, while the transfer screw pump 120 is used to adjust the cavity pressure of the die head 150 within a small range during continuous production. This adjustment method is simple and safe to operate. Using this coating method to prepare electrode sheets can reduce the fluctuation range of the areal density of the active material in the electrode sheet, ensuring the uniformity of the electrode coating.

[0062] In some embodiments of this application, the S100 coating start stage includes:

[0063] S110: Timing T1 begins when the self-feeding screw pump 140 starts, and at preset intervals △t1, it checks whether the pressure P3 detected by the third pressure sensor 151 has reached P. 3设定 If P3 < P 3设定 Then the increment value of the rotational speed v2 of the feed screw pump 140 at each preset time interval △t1 is △v;

[0064] S120: If T1≤3S, then adjust △v=v2+m, where m is a preset constant value;

[0065] S130: If 3S < T1 < 5S, then maintain Δv = v2;

[0066] S140: If T1≥5S, then adjust △v=v2-m, where m is a preset constant value, until P3=P 3设 Certainly.

[0067] As an example, Δt1 = 1s; in other embodiments, Δt1 can also be a preset value such as 0.5s, 2s, etc.

[0068] Using the above method, the cavity pressure of the die head 150 can be rapidly increased to P. 3设定 .

[0069] In some embodiments of this application, the S200 continuous production stage includes:

[0070] S210 Observation Phase: Start timing T2. After T2 ≥ 2s, stop timing and reduce the speed v2 of the feed screw pump 140 to the preset value V. 2设定 ;

[0071] S220 Pressure Adjustment Phase: At a preset time interval Δt2, check whether the pressure P1 detected by the first pressure sensor 141 is maintained at P. 1设定 If P1≠P 1设定 Then change the rotational speed v1 of the intermediate screw pump 120 until P1 = P 1设定 .

[0072] As an example, Δt2 = 10s; in other embodiments, Δt2 can also be a preset value such as 5s or 15s.

[0073] Using the above method, the inlet pressure of the feed screw pump 140 can be maintained at P1 = P1 in a simple and reliable manner. 1设定 This ensures that the cavity pressure of the mold head 150 is maintained within a preset range.

[0074] Furthermore, the S220 pressure adjustment phase includes:

[0075] S221: If P1 < P 1设定 Then the rotational speed v1 of the intermediate screw pump 120 will be adjusted to v1+n in the next preset time interval △t2, where n is a preset constant value.

[0076] S222: If P1 > P 1设定 Then the rotational speed v1 of the intermediate screw pump 120 will be adjusted to v1-n in the next preset time interval Δt2, where n is a preset constant value.

[0077] S223: If P1 = P 1设定 If the rotational speed v1 of the intermediate screw pump 120 remains unchanged for the next preset time interval Δt2, then the rotational speed v1 remains unchanged.

[0078] Using the above method, the rotational speed v1 of the intermediate screw pump 120 can be adjusted simply and reliably to maintain it at a constant value, thereby keeping the cavity pressure of the die head 150 within a preset range.

[0079] Furthermore, the S220 pressure adjustment phase includes:

[0080] S224: If the results detected by two consecutive preset time intervals Δt2 are both P1 < P 1设定 Then the rotational speed v1 of the intermediate screw pump 120 is adjusted to v1+n+b in the next preset time interval △t2, where b is a preset constant value.

[0081] S225: If the results detected at two consecutive preset time intervals Δt2 are both P1 > P 1设定 Then, the rotational speed v1 of the intermediate screw pump 120 will be adjusted to v1-nb in the next preset time interval Δt2, where b is a preset constant value.

[0082] As an example, b = 1; in other embodiments, b can also be a preset value such as 0.5, 2, 4, etc.

[0083] Using the above method, the inlet pressure of the feed screw pump 140 can be significantly lower or higher than P. 1设定 At the same time, the rotational speed v1 of the intermediate screw pump 120 is quickly and effectively adjusted so that the inlet pressure of the feed screw pump 140 is at P. 1设定 .

[0084] In some embodiments of this application, the S200 continuous production stage further includes an S230 viscosity adjustment stage, comprising:

[0085] S231: At a preset time interval Δt2, check whether the pressure u detected by viscometer 161 is maintained at u. 设定 ;

[0086] S232: If u < u 设定 Then, the temperature K of the heating medium provided by the mold temperature controller 163 in the next preset time interval △t2 is adjusted to k+a, where a is a preset constant value;

[0087] S233: If u > u 设定 Then, the temperature K of the heating medium provided by the mold temperature controller 163 in the next preset time interval △t2 is adjusted to ka, where a is a preset constant value;

[0088] S234: If u = u 设定 If the temperature K of the heating medium provided by the mold temperature controller 163 remains unchanged during the next preset time interval Δt2, then the temperature K of the heating medium will remain unchanged.

[0089] The above method can quickly adjust the temperature K of the heating medium provided by the mold temperature controller 163, so that the viscosity u of the slurry can be quickly reached and maintained at u. 设定 .

[0090] The coating apparatus 100 of this application embodiment can reduce the fluctuation range of the cavity pressure of the die head during the coating process, thereby reducing the fluctuation range of the areal density of the active material of the electrode and ensuring the coating uniformity of the electrode.

[0091] It should be noted that, where there is no conflict, the features in the embodiments of this application can be combined with each other.

[0092] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A coating apparatus (100), characterized in that, The coating apparatus (100) includes a transfer tank (110), a transfer screw pump (120), a buffer tank (130), a feed screw pump (140), and a die head (150) connected in sequence. The coating apparatus (100) also includes a control device (170). A first pressure sensor (141) is provided on the pipe between the inlet of the buffer tank (130) and the feed screw pump (140). A third pressure sensor (151) is provided on the die head (150). The control device (170) is signal connected to the transfer screw pump (120), the feed screw pump (140), the first pressure sensor (141), and the third pressure sensor (151). Initial coating stage: The control device (170) is configured to control the feed screw pump (140) to increase its rotation speed until the cavity pressure of the die head (150) detected by the third pressure sensor (151) reaches a preset value P. 3设定 It enters the continuous production stage; Continuous production stage: The control device (170) is configured to control the intermediate screw pump (120) to change its rotational speed according to the pressure detected by the first pressure sensor (141), so that the detection value of the first pressure sensor (141) is maintained within a preset range P. 1设定 .

2. The coating apparatus (100) according to claim 1, characterized in that, The buffer tank (130) is equipped with a level sensor (131), and the control device (170) is signal-connected to the level sensor (131). When the level sensor (131) detects that the level of the slurry in the buffer tank (130) exceeds the threshold L, max At that time, the control device (170) is configured to control the transfer screw pump (120) to stop pumping material to the buffer tank (130).

3. The coating apparatus (100) according to claim 2, characterized in that, The coating apparatus (100) further includes a first alarm element (133), and the control device (170) is signal-connected to the first alarm element (133). When the liquid level sensor (131) detects that the liquid level of the slurry in the buffer tank (130) exceeds the threshold L, max At that time, the control device (170) is configured to control the first warning element (133) to issue a warning signal.

4. The coating apparatus (100) according to claim 1, characterized in that, The coating apparatus (100) further includes: A viscosity adjustment module (160) is installed on the pipeline between the feed screw pump (140) and the die head (150) for adjusting the viscosity of the slurry.

5. The coating apparatus (100) according to claim 4, characterized in that, The viscosity adjustment module (160) includes a viscometer (161), a heat exchanger (162), and a mold temperature controller (163). The viscometer (161) is installed on the pipeline between the feed screw pump (140) and the heat exchanger (162). The heat exchanger (162) is connected to the mold head (150). The control device (170) is signal-connected to both the viscometer (161) and the mold temperature controller (163). The heat exchanger (162) is used to heat the slurry to change its viscosity. The mold temperature controller (163) is used to provide a heating medium to the heat exchanger (162). The control device (170) is configured to change the temperature of the heating medium according to the viscosity of the slurry detected by the viscometer (161).

6. The coating apparatus (100) according to claim 1, characterized in that, The feed screw pump (140) is equipped with a second pressure sensor (142) on its outlet side. The control device (170) is connected to the second pressure sensor (142) via a signal connection. When the pressure of the slurry detected by the second pressure sensor (142) exceeds the threshold P, 2max At that time, the control device (170) is configured to control the feed screw pump (140) to stop pumping material to the die head (150).

7. The coating apparatus (100) according to claim 6, characterized in that, The coating apparatus (100) further includes a second warning element (143), and the control device (170) is signal-connected to the second warning element (143). When the pressure of the slurry detected by the second pressure sensor (142) exceeds the threshold P, the control device (170) will activate the second warning element. 2max At that time, the control device (170) is configured to control the second warning element (143) to issue a warning signal.

8. The coating apparatus (100) according to claim 1, characterized in that, A feed valve (132) is provided on the pipeline between the transfer screw pump (120) and the buffer tank (130) for opening and closing the pipeline between the transfer screw pump (120) and the buffer tank (130).

9. An electrode production apparatus (200), characterized in that, include: A current collector conveying device (210) is used to convey current collectors; The coating apparatus (100) according to any one of claims 1 to 8 is used to coat the surface of the current collector with an active substance.

10. A battery cell manufacturing equipment (300), characterized in that, include: Two electrode production devices (200) as described in claim 9 are used to provide positive electrode sheets and negative electrode sheets, respectively; A diaphragm supply device (310) is used to supply a diaphragm; A cell fabrication apparatus (320) is used to wind a stacked positive electrode sheet, a separator, and a negative electrode sheet to form a cell; or to stack a positive electrode sheet, a separator, and a negative electrode sheet to form a cell.

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