Buffer tank and battery coating system

Abstract

The embodiment of the utility model provides a buffer tank and a battery coating system. The buffer tank comprises a tank body, a first driving part, a second driving part, a first rotating shaft, a second rotating shaft, a dispersing disc and a stirring paddle assembly, the first driving piece and the second driving piece are arranged on the upper surface of the tank body top cover; one end of the first rotating shaft is connected with the first driving part, the dispersing disc is connected with the first rotating shaft, the first driving part is used for driving the first rotating shaft to rotate and driving the dispersing disc to rotate around the first rotating shaft, and the dispersing disc is provided with a plurality of sawtooth-shaped flanges in the circumferential direction; one end of the second rotating shaft is connected with the second driving part, the stirring paddle assembly is connected with the second rotating shaft, and the second driving part is used for driving the second rotating shaft to rotate and driving the stirring paddle assembly to rotate around the second rotating shaft. And the sawtooth-shaped flanges arranged on the dispersion disc can improve the shearing effect, so that the viscosity of the slurry in the tank body can be reduced. And the dispersing disc and the stirring paddle assembly operate independently, so that proper viscosity can still be kept in the tank body under the condition that the feeding system is shut down.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery manufacturing, and specifically relates to a buffer tank and a battery coating system. Background Art

[0002] The coating process is a process of evenly coating a liquid or slurry on a substrate. It is one of the key processes in the manufacturing process of lithium-ion battery pole pieces and directly determines factors such as battery capacity and cycle performance. With the rapid growth in demand for power batteries, higher requirements are placed on the coating process.

[0003] In actual production, the coating and feeding system cannot produce continuously, or it frequently stops. When the feeding system and the coating die head are in a static state for a long time, the viscosity of the slurry increases, and it is easy to form a jelly or agglomerate. Generally speaking, in the ternary system, the viscosity specification range of the positive electrode slurry is 4000Mpa.s~10000Mpa.s. When the slurry is in a dynamic stirring process, the viscosity of the slurry remains basically unchanged. After being left in a static state for 12 hours, the slurry viscosity will rise from 5000Mpa.s~6000Mpa.s to 15000Mpa.s~16000Mpa.s, and the viscosity of the lithium iron phosphate system will rise more seriously. When the coating process is restarted, due to the increase in the viscosity of the slurry and agglomeration, it is easy to cause large fluctuations in the coating surface density, pitting, pits and scratches in the coating film area and other undesirable conditions. If the slurry is poured back into the buffer tank for manual stirring at this time, a lot of manpower will be consumed and production capacity will be affected.

[0004] In traditional technology, the buffer tank cannot maintain the appropriate viscosity of the slurry when the feeding system is shut down, that is, it cannot avoid the slurry from agglomerating, which affects the coating effect of the battery electrode. Utility Model Content

[0005] The purpose of the embodiments of the utility model is to provide a buffer tank and a battery coating system, in order to solve the problem in the related art that the slurry in the buffer tank cannot maintain a suitable viscosity when the feeding system is in a shutdown state.

[0006] In order to solve the above technical problems, the utility model is achieved as follows:

[0007] In a first aspect, an embodiment of the utility model provides a buffer tank for battery coating, comprising a tank body, a first driving member, a second driving member, a first rotating shaft, a second rotating shaft, a dispersion disk, and a stirring paddle assembly;

[0008] The first driving member and the second driving member are arranged on the surface of the top cover of the tank body away from the inside of the tank body, and the first rotating shaft, the second rotating shaft, the dispersion disk and the stirring paddle assembly are arranged in the tank body;

[0009] One end of the first rotating shaft is connected to the first driving member, and the dispersion disk is connected to the first rotating shaft. The first driving member is used to drive the first rotating shaft to rotate and drive the dispersion disk to rotate around the first rotating shaft. The dispersion disk is provided with a plurality of serrated flanges along the circumference.

[0010] One end of the second rotating shaft is connected to the second driving member, and the stirring paddle assembly is connected to the second rotating shaft. The second driving member is used to drive the second rotating shaft to rotate and drive the stirring paddle assembly to rotate around the second rotating shaft.

[0011] Optionally, the stirring paddle assembly includes a cross bar, a first vertical bar and a second vertical bar;

[0012] The middle part of the cross bar is connected to the other end of the second rotating shaft, one end of the cross bar is connected to the first vertical bar, the other end of the cross bar is connected to the second vertical bar, the first rotating shaft and the dispersion plate are located between the second rotating shaft and the first vertical bar, and / or the first rotating shaft and the dispersion plate are located between the second rotating shaft and the second vertical bar;

[0013] The cross bar extends in a radial direction of the tank body, and the first vertical bar and the second vertical bar extend in an axial direction of the tank body.

[0014] Optionally, the serrated flanges are triangular in shape and inclined toward the same side.

[0015] Optionally, there are at least two of the first rotating shaft and the dispersion disk;

[0016] One of the first rotating shafts and one of the dispersion plates is located between the second rotating shaft and the first vertical rod, and another of the first rotating shafts and another of the dispersion plates is located between the second rotating shaft and the second vertical rod.

[0017] Optionally, a plurality of dispersion discs are connected to the first rotating shaft, and the plurality of dispersion discs are arranged at intervals along the axial direction of the first rotating shaft.

[0018] Optionally, a plurality of dispersion disks connected to the same first rotating shaft are coaxially arranged.

[0019] Optionally, the first driving member and / or the second driving member is a driving motor.

[0020] In a second aspect, an embodiment of the utility model further provides a battery coating system, including a feeding tank, a feeding pipeline, a first delivery pump and a buffer tank as described in any one of the above items;

[0021] The feeding pipeline is connected between the feeding tank and the feeding port of the tank body, and the first delivery pump is arranged on the feeding pipeline.

[0022] Optionally, it also includes a feeding pipeline, a reflux pipeline, a three-way valve and a coating die head;

[0023] The first interface of the three-way valve is connected to the discharge port of the tank body through the feeding pipeline, the second interface of the three-way valve is connected to the reflux port of the tank body through the reflux pipeline, and the third interface of the three-way valve is connected to the coating die head.

[0024] Optionally, it also includes a second delivery pump and a filter element;

[0025] The second delivery pump and the filter element are arranged in the feeding pipeline, the second delivery pump is close to the buffer tank, and the filter element is close to the three-way valve.

[0026] In an embodiment of the utility model, the first driving member is connected to the dispersion disk through the first rotating shaft, and the second driving member is connected to the stirring paddle assembly through the second rotating shaft. The first driving member and the second driving member can operate independently. First, the first driving member is turned on, so that the dispersion disk rotates at high speed around the first rotating shaft, and the shearing effect of the serrated flange on the dispersion disk can disperse and stir the slurry to a specified viscosity. Then the first driving member is turned off, and the second driving member is turned on, so that the stirring paddle assembly rotates slowly around the second rotating shaft to mix the slurry evenly and eliminate bubbles for coating the battery pole piece. The serrated flange provided on the dispersion disk of the utility model embodiment can enhance the shearing effect, which is conducive to reducing the viscosity of the slurry in the tank body. In addition, the dispersion disk and the stirring paddle assembly can operate independently, effectively controlling the stirring process, so that when the feeding system is shut down, the tank body can still maintain a relatively suitable viscosity, avoiding slurry agglomeration and affecting the coating effect on the battery pole piece side. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the structure of the cache tank provided by the embodiment of the utility model;

[0028] Figure 2 This utility model embodiment Figure 1 A cross-sectional view along the direction A;

[0029] Figure 3 This utility model embodiment Figure 1 Schematic diagram along direction B;

[0030] Figure 4 It is a schematic diagram of a battery coating system provided in an embodiment of the utility model.

[0031] Reference numerals:

[0032] 1- cache tank, 11- tank body, 111- top cover, 112- first through hole, 113- second through hole, 114- feed port, 115- discharge port, 116- reflux port, 12- first driving member, 13- second driving member, 14- first rotating shaft, 15- second rotating shaft, 16- dispersion disk, 161- serrated flange, 17- stirring paddle assembly, 171- cross bar, 172- first vertical bar, 173- second vertical bar, 2- feeding tank, 3- feeding pipeline, 41- first delivery pump, 42- second delivery pump, 5- feeding pipeline, 6- reflux pipeline, 7- three-way valve, 71- first interface, 72- second interface, 73- third interface, 8- coating die head, 9- filter element. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] The terms "first", "second", etc. in the specification and claims of the present utility model are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the utility model can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0035] The cache tank and battery coating system provided by the embodiment of the utility model are described in detail below through specific embodiments and their application scenarios in conjunction with the accompanying drawings.

[0036] Reference Figures 1 to 3The utility model embodiment provides a cache tank 1 for battery coating, comprising a tank body 11, a first driving member 12, a second driving member 13, a first rotating shaft 14, a second rotating shaft 15, a dispersion disk 16, and a stirring paddle assembly 17; the first driving member 12 and the second driving member 13 are arranged on the surface of the top cover 111 of the tank body 11 away from the inside of the tank body 11, the first rotating shaft 14, the second rotating shaft 15, the dispersion disk 16 and the stirring paddle assembly 17 are arranged in the tank body 11; one end of the first rotating shaft 14 is connected to the first driving member 13, and the first driving member 12 is connected to the first driving member 13. The dispersion disk 16 is connected to the first rotating shaft 14, the first driving member 12 is used to drive the first rotating shaft 14 to rotate, and drive the dispersion disk 16 to rotate around the first rotating shaft 14, and the dispersion disk 16 is provided with a plurality of serrated flanges 161 along the circumferential direction; one end of the second rotating shaft 15 is connected to the second driving member 13, and the stirring paddle assembly 17 is connected to the second rotating shaft 15, and the second driving member 13 is used to drive the second rotating shaft 15 to rotate, and drive the stirring paddle assembly 17 to rotate around the second rotating shaft 15.

[0037] Specifically, if Figures 1 to 3As shown, the tank body 11 contains a first rotating shaft 14, a second rotating shaft 15, a dispersion disc 16 and a stirring paddle assembly 17. The volume of the tank body 11 is 100L to 150L. The upper part of the tank body 11 is connected with a top cover 111, and the first driving member 12 and the second driving member 13 are arranged on the upper surface of the top cover 111. The first driving member 12 and the second driving member 13 include but are not limited to a driving motor or a rotary cylinder. Exemplarily, the first driving member 12 of this embodiment is a dispersion disc motor, and the second driving member 13 is a stirring paddle motor. The first driving member 12 and the second driving member 13 can operate independently, that is, the two can operate simultaneously or successively. The top cover 111 is provided with a first through hole 112 and a second through hole 113. The upper end of the first rotating shaft 14 is connected to the first driving member 12, and extends into the tank body 11 through the first through hole 112. The first rotating shaft 14 passes through the dispersion disc 16 and is coaxially connected to the dispersion disc 16. The number of dispersion discs 16 can be set to one, two or three, and the plurality of dispersion discs 16 are distributed along the axis of the first rotating shaft 14. The upper surface of the dispersion disc 16 is evenly provided with a plurality of serrated flanges 161 along the circumferential direction to strengthen the shear force of the dispersion disc 16 on the slurry. The dispersion disc motor is powered on to drive the first rotating shaft 14 and the dispersion disc 16 to rotate at a high speed. Under the action of the serrated flanges 161 rotating along the circumferential direction, different serrated flanges 161 cut and stir the slurry in turn to reduce the viscosity of the slurry until the viscosity requirement is met. The upper end of the second rotating shaft 15 is connected to the second driving member 13, and extends into the tank body 11 through the second through hole 113. The lower end of the second rotating shaft 15 is connected to the stirring paddle assembly 17. The stirring paddle assembly 17 of this embodiment adopts an anchor stirring paddle. The stirring paddle motor is powered on to drive the second rotating shaft 15 and the stirring paddle assembly 17 to rotate at a low speed to mix the slurry evenly and eliminate bubbles for use in coating the battery pole piece.

[0038] In some embodiments, the first driving member 12 is first turned on, and the dispersion disk 16 rotates at high speed around the first rotating shaft 14. Under the shear force of the serrated flange 161, the slurry is dispersed at high speed to reach a specified viscosity. Then the first driving member 12 is turned off. The second driving member 13 is turned on, and the stirring paddle assembly 17 stirs slowly at a low speed. The slurry is stirred evenly until the bubbles disappear. The coating die head 8 can be turned on, and the slurry is delivered through the feeding pipeline 5 for coating the battery pole piece.

[0039] During the production process, slurry viscosity that is too high or too low is not suitable for pole piece coating. In the embodiment of the utility model, the serrated flanges provided on the dispersion disk cut and stir the slurry in turn during the rotation process, which can enhance the shearing effect and help reduce the slurry viscosity in the tank. In addition, the dispersion disk and the stirring paddle assembly can operate independently to effectively control the stirring process, so that when the feeding system is shut down, the tank can still maintain a relatively suitable viscosity, avoiding slurry agglomeration and affecting the coating effect on the battery pole side. At the same time, the high degree of automation avoids pouring the slurry back into the buffer tank for manual stirring, saving manpower and increasing production capacity.

[0040] Optionally, refer to Figure 1 and Figure 2 The stirring paddle assembly 17 includes a cross bar 171, a first vertical bar 172 and a second vertical bar 173; the middle part of the cross bar 171 is connected to the other end of the second rotating shaft 15, one end of the cross bar 171 is connected to the first vertical bar 172, and the other end of the cross bar 171 is connected to the second vertical bar 173, the first rotating shaft 14 and the dispersion disk 16 are located between the second rotating shaft 15 and the first vertical bar 172, and / or, the first rotating shaft 14 and the dispersion disk 16 are located between the second rotating shaft 15 and the second vertical bar 173; the cross bar 171 extends along the radial direction of the tank body 11, and the first vertical bar 172 and the second vertical bar 173 extend along the axial direction of the tank body 11.

[0041] Specifically, if Figure 1 and Figure 2 As shown, the stirring paddle assembly 17 is an anchor stirring paddle, which is composed of a cross bar 171, a first vertical bar 172 and a second vertical bar 173. The cross bar 171 is parallel to the radial direction of the tank body 11, and the middle part is connected to the lower end of the second rotating shaft 15, and rotates in the XY plane driven by the second rotating shaft 15. One end of the cross bar 171 is connected to the first vertical bar 172, and the other end is connected to the second vertical bar 173. The first vertical bar 172 and the first vertical bar 172 are parallel to the axial direction of the tank body 11, and the first vertical bar 172 and the first vertical bar 172 rotate around the second rotating shaft 15. When there is one first rotating shaft 14, the first rotating shaft 14 and the dispersion disk 16 are located between the first vertical rod 172 or the second vertical rod 173 and the second rotating shaft 15; when there are at least two first rotating shafts 14, at least one first rotating shaft 14 and the dispersion disk 16 are arranged between the first vertical rod 172 and the second rotating shaft 15, and at least one first rotating shaft 14 and the dispersion disk 16 are arranged between the second vertical rod 173 and the second rotating shaft 15. The dispersion disk 16 mainly stirs and disperses the slurry in the middle of the tank body 11, and the stirring paddle assembly 17 stirs the slurry in the tank body 11 along the circumferential direction, so that the dispersion disk 16 and the stirring paddle assembly 17 can rotate independently without interfering with each other, that is, the dispersion disk 16 and the stirring paddle assembly 17 can move simultaneously or successively.

[0042] Optionally, refer to Figure 1 and Figure 2 The serrated flange 161 is triangular in shape and inclined toward the same side.

[0043] Specifically, if Figure 1 and Figure 2As shown, the sawtooth flange 161 is a right triangle, and the right angle sides of each sawtooth flange 161 face the same side, that is, the sawtooth flange 161 is inclined to the same side. Therefore, when the dispersion disk 16 rotates, the same direction of shear force can be formed on the slurry, which is conducive to uniform stirring and effectively reduces the viscosity of the slurry.

[0044] Optionally, refer to Figure 1 and Figure 2 There are at least two first rotating shafts 14 and dispersion discs 16; one of the first rotating shafts 14 and one of the dispersion discs 16 is located between the second rotating shaft 15 and the first vertical rod 172, and another of the first rotating shafts 14 and another of the dispersion discs 16 is located between the second rotating shaft 15 and the second vertical rod 173.

[0045] Specifically, if Figure 1 and Figure 2 As shown, at least two first rotating shafts 14 and dispersion disks 16 are provided in this embodiment. At least one dispersion disk 16 is connected to each first rotating shaft 14. At least one first rotating shaft 14 and dispersion disk 16 are provided between the first vertical rod 172 and the second rotating shaft 15, and at least one first rotating shaft 14 and dispersion disk 16 are provided between the second vertical rod 173 and the second rotating shaft 15. Different first rotating shafts 14 and dispersion disks 16 are distributed along the radial direction of the tank body 11. Each first rotating shaft 14 is connected to a first driving member 12, and different first driving members 12 can operate synchronously or independently, and the operator can flexibly control them according to actual conditions. When the two first driving members 12 are running at the same time, the first rotating shaft 14 and the dispersion disk 16 are synchronously driven to rotate, and the slurry is evenly stirred and dispersed in the radial direction, effectively reducing the slurry viscosity and meeting the coating requirements of the battery pole pieces.

[0046] Optionally, refer to Figure 1 and Figure 2 A plurality of dispersion discs 16 are connected to the first rotating shaft 14 , and the plurality of dispersion discs 16 are arranged at intervals along the axial direction of the first rotating shaft 14 .

[0047] Specifically, if Figure 1 and Figure 2 As shown, along the axial Z direction of the first rotating shaft 14, a plurality of dispersion discs 16 are provided on the first rotating shaft 14, and the plurality of dispersion discs 16 on the same first rotating shaft 14 are evenly spaced. During the rotation of the first rotating shaft 14, the slurry at different heights can be stirred and dispersed along the Z direction, effectively reducing the viscosity of the slurry. In this embodiment, three dispersion discs 16 are connected to each first rotating shaft 14.

[0048] Optionally, refer to Figure 1 and Figure 2 , multiple dispersion disks 16 connected to the same first rotating shaft 14 are coaxially arranged.

[0049] Specifically, if Figure 1 and Figure 2 As shown, the multiple dispersion discs 16 connected to the same first rotating shaft 14 are coaxial. That is, the first rotating shaft 14 passes through the centers of the multiple dispersion discs 16 to connect the dispersion discs 16 coaxially. This structure is easy to install and the stirring and dispersing process is more uniform and easy to control.

[0050] Reference Figure 4 The embodiment of the utility model also provides a battery coating system, including a feeding tank 2, a feeding pipeline 3, a first delivery pump 41 and the buffer tank 1 described in any of the above embodiments; the feeding pipeline 3 is connected between the feeding tank 2 and the feed port 114 of the tank body 11, and the first delivery pump 41 is arranged on the feeding pipeline 3.

[0051] Specifically, if Figure 4 As shown, the feeding tank 2 is also called a transfer tank, which is used to store the slurry transferred to the buffer tank 1. The feeding pipeline 3 is connected between the feeding tank 2 and the feed port 114 of the tank body 11. The first delivery pump 41 is arranged on the feeding pipeline 3 to increase the pumping rate of the incoming material. The first delivery pump 41 of this embodiment adopts a screw pump.

[0052] Optionally, refer to Figure 4 The battery coating system also includes a feeding pipeline 5, a reflux pipeline 6, a three-way valve 7 and a coating die 8; the first interface 71 of the three-way valve 7 is connected to the discharge port 115 of the tank body 11 through the feeding pipeline 5, the second interface 72 of the three-way valve 7 is connected to the reflux port 116 of the tank body 11 through the reflux pipeline 6, and the third interface 73 of the three-way valve 7 is connected to the coating die 8.

[0053] Specifically, if Figure 4 As shown, the three-way valve 7 has interfaces in three directions, namely the first interface 71, the second interface 72 and the third interface 73. Among them, the first interface 71 is connected to the discharge port 115 of the tank body 11 through the feeding pipeline 5, the third interface 73 is connected to the coating die head 8, and the second interface 72 is connected to the reflux port 116 of the tank body 11 through the reflux pipeline 6. Each interface of the three-way valve 7 can be controlled to open and close, and the first interface 71 is always open. When the second interface 72 is opened and the third interface 73 is closed, the slurry circulates in the feeding pipeline 5 and the reflux pipeline 6, which is conducive to the uniform mixing of the slurry, eliminates the bubbles generated during the dispersion process, and prevents the viscosity of the slurry from rebounding in a static state. When there are no bubbles, the second interface 72 is closed, the third interface 73 is opened, and the coating die head 8 is opened to carry out the coating process of the battery pole piece. The battery coating system provided by this embodiment has uniform material loading, small fluctuations in surface density, and it is not easy to produce pitting, pits and scratches in the coating film area.

[0054] Optionally, refer to Figure 4 , and also includes a second delivery pump 42 and a filter element 9; the second delivery pump 42 and the filter element 9 are arranged in the feeding pipeline 5, the second delivery pump 42 is close to the buffer tank 1, and the filter element 9 is close to the three-way valve 7.

[0055] Specifically, if Figure 4 As shown, the second delivery pump 42 of this embodiment is a screw pump. Under the pumping action of the second delivery pump 42, the slurry is discharged from the discharge port 115 and pumped to the coating die head 8 through the feeding pipeline 5, which can improve the coating rate and the slurry circulation rate. The filter element 9 is a capsule filter element, which is arranged on the feeding pipeline 5 and close to the three-way valve 7 to filter larger particles in the slurry and maintain the feeding stability.

[0056] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0057] The embodiments of the utility model are described above in conjunction with the accompanying drawings, but the utility model is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the utility model, ordinary technicians in this field can also make many forms without departing from the scope of protection of the utility model and the claims, all of which are within the protection of the utility model.

Claims

1. A buffer tank for battery coating, characterized in that: It includes a tank body, a first driving member, a second driving member, a first rotating shaft, a second rotating shaft, a dispersion disk, and a stirring paddle assembly; The first driving member and the second driving member are arranged on the surface of the top cover of the tank body away from the inside of the tank body, and the first rotating shaft, the second rotating shaft, the dispersion disk and the stirring paddle assembly are arranged in the tank body; One end of the first rotating shaft is connected to the first driving member, and the dispersion disk is connected to the first rotating shaft. The first driving member is used to drive the first rotating shaft to rotate and drive the dispersion disk to rotate around the first rotating shaft. The dispersion disk is provided with a plurality of serrated flanges along the circumference. One end of the second rotating shaft is connected to the second driving member, and the stirring paddle assembly is connected to the second rotating shaft. The second driving member is used to drive the second rotating shaft to rotate and drive the stirring paddle assembly to rotate around the second rotating shaft.

2. The cache tank according to claim 1, characterized in that: The stirring paddle assembly includes a cross bar, a first vertical bar and a second vertical bar; The middle part of the cross bar is connected to the other end of the second rotating shaft, one end of the cross bar is connected to the first vertical bar, the other end of the cross bar is connected to the second vertical bar, the first rotating shaft and the dispersion plate are located between the second rotating shaft and the first vertical bar, and / or the first rotating shaft and the dispersion plate are located between the second rotating shaft and the second vertical bar; The cross bar extends in a radial direction of the tank body, and the first vertical bar and the second vertical bar extend in an axial direction of the tank body.

3. The cache tank according to claim 1, characterized in that: The serrated flanges are triangular in shape and inclined toward the same side.

4. The cache tank according to claim 2, characterized in that: There are at least two of the first rotating shaft and the dispersion disk; One of the first rotating shafts and one of the dispersion plates is located between the second rotating shaft and the first vertical rod, and another of the first rotating shafts and another of the dispersion plates is located between the second rotating shaft and the second vertical rod.

5. The cache tank according to claim 1 or 2, characterized in that: The first rotating shaft is connected to a plurality of dispersion discs, and the plurality of dispersion discs are arranged at intervals along the axial direction of the first rotating shaft.

6. The cache tank according to claim 5, characterized in that: A plurality of dispersion disks connected to the same first rotating shaft are coaxially arranged.

7. The cache tank according to claim 1, characterized in that: The first driving member and / or the second driving member is a driving motor.

8. A battery coating system, characterized in that: It comprises a feeding tank, a feeding pipeline, a first delivery pump and a buffer tank as described in any one of claims 1 to 7; The feeding pipeline is connected between the feeding tank and the feeding port of the tank body, and the first delivery pump is arranged on the feeding pipeline.

9. The battery coating system according to claim 8, characterized in that: It also includes a feeding pipeline, a return pipeline, a three-way valve and a coating die head; The first interface of the three-way valve is connected to the discharge port of the tank body through the feeding pipeline, the second interface of the three-way valve is connected to the reflux port of the tank body through the reflux pipeline, and the third interface of the three-way valve is connected to the coating die head.

10. The battery coating system according to claim 9, characterized in that: Also includes a second delivery pump and a filter element; The second delivery pump and the filter element are arranged in the feeding pipeline, the second delivery pump is close to the buffer tank, and the filter element is close to the three-way valve.

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