Lithium battery slurry coating system

Abstract

The utility model provides a coating system for lithium battery slurry. The lithium battery slurry coating system comprises a slurry storage part, a slurry temporary storage part, a coating die head and at least one power component, the lithium battery slurry coating system further comprises a material conveying pipeline, a material supplementing pipeline and a material mixing pipeline. The lithium battery slurry coating system has a material supplementing state in which the slurry storage part conveys the slurry to the slurry buffer part through the material supplementing pipeline, a coating state in which the slurry buffer part conveys the slurry to the coating die head through the material conveying pipeline, and a material mixing state in which the slurry circularly flows in the slurry storage part, the material supplementing pipeline, the slurry buffer part, the material mixing pipeline and the slurry storage part in sequence. According to the technical scheme provided by the utility model, the problem in the prior art that the coating system for the lithium battery slurry is relatively long in coating and coating adjustment time is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery coating and feeding, in particular to a coating system for lithium battery slurry. Background Art

[0002] The lithium battery coating process typically utilizes a coating tank storage and feeding method. During coating, the slurry in the coating tank is first consumed. When the slurry in the coating tank is depleted to a certain level, the finished product tank is replenished. Due to the differences in slurry between the coating tank and the finished product tank, the slurry in the coating tank is mixed when the finished product tank is replenished. This can cause the consistency of the slurry input to the coating die to deteriorate, causing fluctuations in the coating surface density and prolonging the adjustment time for the coating process. Utility Model Content

[0003] The main purpose of the utility model is to provide a coating system for lithium battery slurry, so as to solve the problem of long adjustment time of coating in the coating system of lithium battery slurry in the prior art.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a coating system for lithium battery slurry, comprising a slurry storage part, a slurry buffer part, a coating die head and at least one power component; the coating system for lithium battery slurry also includes a feeding pipeline, a feeding pipeline and a mixing pipeline; under the action of the power component, the coating system for lithium battery slurry has a feeding state in which the slurry storage part feeds the slurry buffer part via the feeding pipeline, a coating state in which the slurry buffer part feeds the coating die head via the feeding pipeline, and a mixing state in which the slurry circulates in the slurry storage part, the feeding pipeline, the slurry buffer part, the mixing pipeline and the slurry storage part in sequence.

[0005] Through the above arrangement, the coating system of the lithium battery slurry is provided with a mixing pipeline, and the mixing pipeline is used to connect the slurry buffer section and the slurry storage section, so that the slurry can be circulated among the slurry storage section, the feeding pipeline, the slurry buffer section and the mixing pipeline, thereby ensuring the consistency of the viscosity of the slurry in the slurry buffer section and the slurry storage section. Specifically, in working condition 1 (preparation for class opening), that is, before coating begins, a consistent slurry viscosity can be formed by circulating the slurry in the slurry buffer section and the slurry storage section, thereby avoiding slurry mixing fluctuations in the initial stage of class opening; in working condition 2 (continuous coating), after the slurry in the slurry buffer section is consumed, due to the slurry in the slurry storage section, the feeding pipeline, the slurry buffer section and the mixing pipeline The viscosity of the slurry remains consistent, and the slurry storage unit can replenish the slurry of the same viscosity in time, which can avoid the viscosity change caused by the mixing of new and old (different viscosity) slurries, thereby maintaining the consistency of the coating slurry, and thus reducing the fluctuation of the coating surface density; in working conditions 3 (abnormal coating stop) and working conditions 4 (planned shutdown), that is, when encountering abnormal coating stop situations such as scraping and breaking, it can immediately switch to the mixing state to prevent the slurry from changing in viscosity or settling due to standing during the shutdown period, thereby maintaining the consistency of the slurry viscosity, and thus reducing the mixing fluctuation when the machine is restarted. In summary, the utility model can ensure the consistency of the slurry at startup, reduce the adjustment time of coating, and thus improve production efficiency.

[0006] Furthermore, a power component is provided on the material delivery pipeline, and a power component is provided on the material replenishment pipeline.

[0007] By the above arrangement, power components are provided on the feeding pipeline and the feeding pipeline, which can ensure that the slurry flows more smoothly and efficiently, and can avoid the transportation difficulties caused by the high viscosity of the slurry, thereby ensuring that the slurry can be transported from the slurry storage part to the slurry buffer part, and from the slurry buffer part to the coating die head in a timely and stable manner, thus improving the efficiency of the slurry circulation.

[0008] Furthermore, the coating system of the lithium battery slurry also includes a connecting pipeline, one end of the connecting pipeline is connected to the material delivery pipeline, and the other end of the connecting pipeline is connected to the mixing pipeline.

[0009] With the above arrangement, without the need for additional power components, it is possible to achieve a feeding state in which the slurry storage section feeds the slurry buffer section via the feeding pipeline, a coating state in which the slurry buffer section feeds the slurry to the coating die head via the feeding pipeline, and a mixing state in which the slurry circulates sequentially through the slurry storage section, the feeding pipeline, the slurry buffer section, the mixing pipeline, the connecting pipeline, and the slurry storage section. This can reduce manufacturing costs.

[0010] Furthermore, the lithium battery slurry coating system also includes a first three-way valve, a first end of the first three-way valve is connected to the slurry buffer, a second end of the first three-way valve is connected to the connecting pipeline, and a third end of the first three-way valve is connected to the mixing pipeline.

[0011] Through the above arrangement, the connection and disconnection between the communication pipeline and the mixing pipeline can be controlled to achieve slurry circulation between the slurry storage part and the slurry buffer part.

[0012] Furthermore, the coating system of the lithium battery slurry also includes a second three-way valve, a first end of the second three-way valve is connected to the coating die head, a second end of the second three-way valve is connected to the connecting pipeline, and a third end of the second three-way valve is connected to the feed pipeline.

[0013] Through the above arrangement, the connection and disconnection of the connecting pipeline and the material delivery pipeline can be controlled, so that the slurry in the slurry buffer section enters the slurry storage section through the material delivery pipeline, the connecting pipeline and the mixing pipeline, thereby realizing the slurry circulation between the slurry storage section and the slurry buffer section.

[0014] Furthermore, the coating system of the lithium battery slurry also includes a die head circulation pipeline, one end of the die head circulation pipeline is connected to the coating die head, and the other end of the die head circulation pipeline is connected to the connecting pipeline.

[0015] Through the above-mentioned setting, the die head circulation pipeline can circulate the slurry inside the coating die head back to the connecting pipeline, and then return to the slurry buffer section or the slurry storage section through the connecting pipeline. In this way, it can ensure that the slurry inside the coating die head is consistent with the slurry in the slurry buffer section and the slurry storage section, thereby avoiding fluctuations in coating quality caused by changes in properties such as slurry viscosity and density.

[0016] Furthermore, a power component is provided on the mixing pipeline; and / or, the feeding pipeline is used to connect the slurry storage part and the slurry buffer part, the feeding pipeline is used to connect the slurry buffer part and the coating die head, and the mixing pipeline is used to connect the slurry buffer part and the slurry storage part.

[0017] Through the above arrangement, on the one hand, slurry circulation between the slurry storage section and the slurry buffer section can be achieved without setting a connecting pipeline; on the other hand, the lithium battery slurry coating system can have a feeding state, a coating state and a mixing state.

[0018] Furthermore, the slurry storage section includes: a storage tank; a driving member; a stirring member, including a rotating shaft and multiple stirring members, one end of the rotating shaft is connected to the output shaft of the driving member, and the other end of the rotating shaft extends into the storage tank, and the multiple stirring members are located in the storage tank and connected to the rotating shaft.

[0019] Through the above setting, the slurry in the storage tank is continuously stirred by multiple stirring members to prevent the slurry from settling during storage, thereby ensuring the uniformity of the slurry. It is suitable for production environments that require long-term storage of slurry, thereby improving the use efficiency and coating quality of the slurry.

[0020] Furthermore, the plurality of stirring members are arranged at intervals along the radial direction and the axial direction of the rotating shaft.

[0021] Through the above setting, a three-dimensional stirring effect can be formed, thereby enhancing the mixing effect of the slurry, and further ensuring the consistency of the slurry components to improve the uniformity and stability of the slurry, which is particularly suitable for the production of high-performance lithium batteries.

[0022] Furthermore, the lithium battery slurry coating system also includes a controller, and the power component, the first three-way valve and the second three-way valve are all control-connected to the controller.

[0023] Through the above-mentioned setting, the controller is connected with the power component, the first three-way valve and the second three-way valve, and the controller can monitor and control the flow state and circulation mode of the slurry in real time, thereby avoiding the problems of slurry waste and low production efficiency caused by manual operation.

[0024] By applying the technical solution of the present invention, the coating system of the lithium battery slurry is provided with a mixing pipeline, which is used to connect the slurry buffer and the slurry storage, so as to realize the circulation of the slurry between the slurry storage, the feeding pipeline, the slurry buffer and the mixing pipeline, thereby ensuring the consistency of the viscosity of the slurry in the slurry buffer and the slurry storage. Specifically, in working condition 1 (preparation for class opening), that is, before coating begins, a consistent slurry viscosity can be formed by circulating the slurry in the slurry buffer and the slurry storage, thereby avoiding the fluctuation of slurry mixing in the early stage of class opening; in working condition 2 (continuous coating), after the slurry in the slurry buffer is consumed, due to the slurry storage, the feeding pipeline, the slurry buffer and the mixing pipeline, the viscosity of the slurry in the slurry buffer and the slurry storage is consistent. The viscosity of the slurry in the pipeline remains consistent, and the slurry storage unit can replenish slurry of the same viscosity in time, which can avoid the viscosity change caused by mixing of new and old (different viscosities) slurries, thereby maintaining the consistency of the coating slurry, and thus reducing the fluctuation of the coating surface density; in working conditions 3 (abnormal coating stop) and working conditions 4 (planned shutdown), that is, when encountering abnormal coating stop situations such as scraping and breaking, it can immediately switch to the mixing state to prevent the slurry from changing in viscosity or settling due to standing during the shutdown period, thereby maintaining the consistency of the slurry viscosity, and thus reducing the mixing fluctuation when the machine is restarted. In summary, the utility model can ensure the consistency of the slurry at startup, reduce the adjustment time of coating, and thus improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings constituting part of this application are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0026] Figure 1 A structural schematic diagram of an embodiment of a lithium battery slurry coating system of the present invention is shown;

[0027] Figure 2 Another structural schematic diagram of an embodiment of the lithium battery slurry coating system of the present invention is shown;

[0028] Figure 3 Another structural schematic diagram of an embodiment of the lithium battery slurry coating system of the present invention is shown;

[0029] Figure 4 Another structural schematic diagram of an embodiment of the lithium battery slurry coating system of the present invention is shown.

[0030] The above drawings include the following reference numerals:

[0031] 10. Slurry storage unit; 11. Storage tank; 12. Driving component; 13. Rotating shaft; 14. Stirring element; 20. Slurry buffer unit; 30. Coating die; 40. Power component; 51. Feeding pipeline; 52. Feeding pipeline; 53. Mixing pipeline; 54. Connecting pipeline; 55. First three-way valve; 56. Second three-way valve; 57. Die circulation pipeline. DETAILED DESCRIPTION

[0032] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0033] like Figure 1 As shown, an embodiment of the present invention provides a coating system for lithium battery slurry. The coating system for lithium battery slurry includes a slurry storage unit 10, a slurry buffer unit 20, a coating die head 30, and at least one power component 40; the coating system for lithium battery slurry also includes a feeding pipeline 51, a feeding pipeline 52, and a mixing pipeline 53; under the action of the power component 40, the coating system for lithium battery slurry has a feeding state in which the slurry storage unit 10 feeds the slurry buffer unit 20 via the feeding pipeline 52, a coating state in which the slurry buffer unit 20 feeds the coating die head 30 via the feeding pipeline 51, and a mixing state in which the slurry circulates through the slurry storage unit 10, the feeding pipeline 52, the slurry buffer unit 20, the mixing pipeline 53, and the slurry storage unit 10 in sequence.

[0034] In the above technical solution, the coating system of the lithium battery slurry is provided with a mixing pipeline 53, which is used to connect the slurry buffer section 20 and the slurry storage section 10, so as to realize the circulation of the slurry between the slurry storage section 10, the feeding pipeline 52, the slurry buffer section 20 and the mixing pipeline 53, thereby ensuring the consistency of the viscosity of the slurry in the slurry buffer section 20 and the slurry storage section 10. Specifically, in working condition 1 (preparation for starting a shift), that is, before starting coating, the slurry is circulated and mixed in the slurry buffer section 20 and the slurry storage section 10 to form a consistent slurry viscosity, thereby avoiding the fluctuation of slurry mixing in the early stage of starting a shift; in working condition 2 (continuous coating), after the slurry in the slurry buffer section 20 is consumed, due to the slurry storage section 10, the feeding pipeline 52 and the mixing pipeline 53 are connected. , the viscosity of the slurry in the slurry buffer section 20 and the mixing pipeline 53 remains consistent, and the slurry storage section 10 can replenish the slurry of the same viscosity in time, which can avoid the viscosity change caused by the mixing of new and old (different viscosities) slurries, thereby maintaining the consistency of the coating slurry, and thus reducing the fluctuation of the coating surface density; in working conditions 3 (abnormal coating stop) and working conditions 4 (planned shutdown), that is, when encountering abnormal coating stop situations such as scraping and breaking, it can immediately switch to the mixing state to prevent the slurry from changing in viscosity or settling due to standing during the shutdown period, thereby maintaining the consistency of the slurry viscosity, and thus reducing the mixing fluctuation when the machine is restarted. In summary, the utility model can ensure the consistency of the slurry at startup, reduce the adjustment time of coating, and thus improve production efficiency.

[0035] Specifically, in the embodiment of the present invention, the feeding pipeline 52 is used to connect the slurry storage section 10 and the slurry buffer section 20, the feeding pipeline 51 is used to connect the slurry buffer section 20 and the coating die head 30, and the mixing pipeline 53 is used to connect the slurry buffer section 20 and the slurry storage section 10. In this way, a feeding state can be achieved in which the lithium slurry storage section 10 feeds the slurry buffer section 20 via the feeding pipeline 52, a coating state in which the slurry buffer section 20 feeds the coating die head 30 via the feeding pipeline 51, and a mixing state in which the slurry circulates in the slurry storage section 10, the feeding pipeline 52, the slurry buffer section 20, the mixing pipeline 53, and the slurry storage section 10 in sequence.

[0036] Specifically, in the embodiment of the present invention, the slurry buffer 20 buffers the slurry and supplies the coating die 30 with the slurry through the feeding pipe 51 for coating. The slurry storage 10 stores the mixed slurry and replenishes the slurry buffer 20 through the feeding pipe 52 to replenish the slurry consumption in the slurry buffer 20.

[0037] like Figure 1 As shown, in the embodiment of the present invention, a power component 40 is provided on the material delivery pipeline 51 , and a power component 40 is provided on the material replenishment pipeline 52 .

[0038] In the above technical solution, a power component 40 is provided on the feed pipeline 51 and the feed pipeline 52, which can ensure that the flow of the slurry is smoother and more efficient, and can avoid the transportation difficulties caused by the high viscosity of the slurry, thereby ensuring that the slurry can be transported from the slurry storage section 10 to the slurry buffer section 20 in a timely and stable manner, and from the slurry buffer section 20 to the coating die head 30. In this way, the efficiency of the slurry circulation is improved, thereby ensuring the consistency of the slurry and the coating quality during the coating process.

[0039] like Figure 1 As shown, in the embodiment of the present invention, the coating system for lithium battery slurry further includes a connecting pipe 54 , one end of the connecting pipe 54 is connected to the material delivery pipe 51 , and the other end of the connecting pipe 54 is connected to the material mixing pipe 53 .

[0040] With the above arrangement, it is possible to realize a feeding state in which the slurry storage section 10 feeds the slurry buffer section 20 via the feeding line 52, a coating state in which the slurry buffer section 20 feeds the coating die head 30 via the feeding line 51, and a mixing state in which the slurry circulates sequentially through the slurry storage section 10, the feeding line 52, the slurry buffer section 20, the mixing line 53, the connecting line 54, and the slurry storage section 10 without additionally providing a power component 40 on the connecting line 54. This can reduce manufacturing costs.

[0041] like Figure 1 As shown, in an embodiment of the present invention, the lithium battery slurry coating system further includes a first three-way valve 55, a first end of the first three-way valve 55 being connected to the slurry buffer 20, a second end of the first three-way valve 55 being connected to the connecting pipe 54, and a third end of the first three-way valve 55 being connected to the mixing pipe 53. In this way, the connection and disconnection between the connecting pipe 54 and the mixing pipe 53 can be controlled to achieve slurry circulation between the slurry storage section 10 and the slurry buffer 20.

[0042] like Figure 1 As shown, in an embodiment of the present invention, the lithium battery slurry coating system further includes a second three-way valve 56, a first end of the second three-way valve 56 being in communication with the coating die head 30, a second end of the second three-way valve 56 being in communication with the connecting pipe 54, and a third end of the second three-way valve being in communication with the material delivery pipe 51. In this way, the connection and disconnection of the connecting pipe 54 and the material delivery pipe 51 can be controlled so that the slurry in the slurry buffer section 20 enters the slurry storage section 10 via the material delivery pipe 51, the connecting pipe 54, and the mixing pipe 53, thereby realizing slurry circulation between the slurry storage section 10 and the slurry buffer section 20.

[0043] like Figure 1As shown, in an embodiment of the present invention, the coating system for lithium battery slurry further includes a die circulation pipeline 57 , one end of which is connected to the coating die 30 , and the other end of which is connected to the connecting pipeline 54 .

[0044] Through the above-mentioned setting, the die head circulation pipeline 57 can circulate the slurry inside the coating die head 30 back to the connecting pipeline 54, and then return to the slurry buffer section 20 or the slurry storage section 10 through the connecting pipeline 54. In this way, it can be ensured that the slurry inside the coating die head 30 is consistent with the slurry in the slurry buffer section 20 and the slurry storage section 10, thereby avoiding fluctuations in coating quality caused by changes in properties such as slurry viscosity and density.

[0045] Specifically, if Figure 2 As shown, in an embodiment of the present invention, the first end of the second three-way valve 56 is connected to the coating die head 30, and the third end is connected to the feed pipeline 51. When the coating operation is carried out normally, the second three-way valve 56 can be adjusted so that the slurry is directly supplied from the slurry buffer section 20 to the coating die head 30 through the feed pipeline 51, and the slurry storage section 10 can be replenished to the slurry buffer section 20 through the feed pipeline 52 to ensure a continuous supply of slurry.

[0046] Specifically, if Figure 4 As shown, in an embodiment of the present invention, when it is necessary to circulate the slurry inside the coating die 30, the valve position of the second three-way valve 56 is adjusted to connect the coating die 30 and the feed pipeline, so that the slurry can enter the coating die 30 through the slurry buffer section 20 and the feed pipeline 51, and the slurry in the coating die 30 returns to the slurry buffer section 20 through the die circulation pipeline 57 and the connecting pipeline 54 to prevent the slurry from solidifying inside the coating die 30, maintain the fluidity and viscosity consistency of the slurry, and thus avoid surface density fluctuations during the coating process.

[0047] Specifically, if Figure 1 As shown, in an embodiment of the present invention, the first three-way valve 55 connects the mixing pipeline 53 and the connecting pipeline 54, the second three-way valve 56 connects the feeding pipeline 51 and the coating die 30, and the die circulation pipeline 57 and the connecting pipeline 54 are connected. In this way, the slurry can return from the slurry storage section 10, the feeding pipeline 52, the slurry buffer section 20, the feeding pipeline 51, the coating die 30, the die circulation pipeline 57, the connecting pipeline 54, and the mixing pipeline 53 to the slurry storage section 10, so as to realize the circulation of the slurry of the entire system, to prevent the slurry from solidifying inside the system, to maintain the fluidity and viscosity consistency of the slurry, and thereby to avoid surface density fluctuations during the coating process.

[0048] Specifically, if Figure 3As shown, in an embodiment of the present invention, the first three-way valve 55 connects the mixing pipeline 53 and the connecting pipeline 54, and the second three-way valve 56 connects the delivery pipeline 51 and the connecting pipeline 54. In this way, the slurry can return from the slurry storage section 10, the feeding pipeline 52, the slurry buffer section 20, the delivery pipeline 51, the connecting pipeline 54, and the mixing pipeline 53 to the slurry storage section 10, so as to realize the circulation of the slurry in the slurry storage section 10 and the slurry buffer section 20.

[0049] In one embodiment, a power component 40 is provided on the mixing pipeline 53. In this way, the slurry circulation between the slurry storage part 10 and the slurry buffer part 20 can be achieved without providing the connecting pipeline 54.

[0050] like Figure 1 As shown, in an embodiment of the present invention, the slurry storage portion 10 includes: a storage tank 11; a driving member 12; a stirring member, including a rotating shaft 13 and a plurality of stirring members 14, one end of the rotating shaft 13 is connected to the output shaft of the driving member 12, and the other end of the rotating shaft 13 extends into the storage tank 11, and the plurality of stirring members 14 are located in the storage tank 11 and connected to the rotating shaft 13.

[0051] Through the above-mentioned setting, the slurry in the storage tank 11 is continuously stirred by multiple stirring members 14 to prevent the slurry from settling during storage, thereby ensuring the uniformity of the slurry. It is suitable for production environments that require long-term storage of slurry, thereby improving the use efficiency and coating quality of the slurry.

[0052] like Figure 1 As shown, in the embodiment of the present invention, a plurality of stirring members 14 are arranged at intervals along the radial direction and the axial direction of the rotating shaft 13 .

[0053] Through the above setting, a three-dimensional stirring effect can be formed, thereby enhancing the mixing effect of the slurry, and further ensuring the consistency of the slurry components to improve the uniformity and stability of the slurry, which is particularly suitable for the production of high-performance lithium batteries.

[0054] like Figure 1 As shown, in the embodiment of the present invention, the lithium battery slurry coating system further includes a controller, and the power component 40, the first three-way valve 55 and the second three-way valve 56 are all control-connected to the controller.

[0055] In the above technical solution, the controller is connected to the power component 40, the first three-way valve 55 and the second three-way valve 56, so that the controller can monitor and control the flow state and circulation mode of the slurry in real time, thereby avoiding the problems of slurry waste and low production efficiency caused by manual operation.

[0056] It should be noted that the lithium battery slurry coating system of the present invention is described below using the slurry viscosity index as an example, including the following working conditions:

[0057] Working condition 1: Preparation for class opening

[0058] Before the coating work begins, the remaining slurry in the slurry buffer section 20 is the remaining slurry from the last coating. Assume that the slurry viscosity in the slurry buffer section 20 is A, the residual slurry viscosity in the feed line 51 is B, the residual slurry viscosity in the coating die head 30 is C, and the slurry in the slurry storage section 10 is a new mixed slurry with a viscosity of D. In the prior art, the coating machine only has a circulation function between the coating die head 30 and the slurry buffer section 20. Before starting the machine, the slurry can be circulated between the slurry buffer section 20 and the coating die head 30, so that the slurry in the slurry buffer section 20, the feed line 51, and the coating die head 30 are mixed to form a slurry with a viscosity of X. At this time, the slurry viscosity in the slurry storage section 10 is still D. Figure 1 As shown, the present application can realize the circulation of slurry in the entire coating system. The slurry storage part 10, the slurry buffer part 20 and the coating die head 30 are connected through various pipelines. Before the coating is started, the system circulation is started to circulate and mix the slurry in the system to form a slurry with a viscosity of Y.

[0059] Working condition 2: continuous coating

[0060] After the start-up preparation is completed, the coating operation is carried out, the slurry in the slurry buffer section 20 is consumed, and the slurry in the slurry storage section 10 is replenished to the slurry buffer section 20. In the coating machine in the prior art, since the slurry in the slurry storage section 10 is inconsistent with the slurry in the slurry buffer section 20, a slurry with a viscosity of X and a viscosity of D will be mixed, resulting in fluctuations in the coating surface density. The present invention realizes a system cycle. During coating, the slurry in the slurry buffer section 20 is consumed, and the slurry in the slurry storage section 10 is replenished to the slurry buffer section 20. At this time, because the viscosity of the slurry in the slurry storage section 10, each pipeline and the slurry buffer section 20 is Y, there is no change in the slurry viscosity, which maintains the consistency of the coating slurry and improves the coating surface density adjustment effect.

[0061] Working condition 3: Abnormal painting stop

[0062] If the coating process encounters problems such as scraping or breaking of the belt, the coating process needs to be stopped. At this time, the coating die head 30 cannot be sealed by the knife feed, and the coating process can be switched to slurry circulation between the slurry buffer section 20 and the slurry storage section 10 to prevent the downtime from being too long, which will cause the slurry in the slurry buffer section 20 to be different from that in the slurry storage section 10. The coating machine in the prior art does not have the circulation function between the slurry buffer section 20 and the slurry storage section 10. Therefore, it can only circulate the slurry in the slurry buffer section 20 and cannot keep it consistent with the slurry in the slurry storage section 10. When the machine is turned on next time, the mixing fluctuation problem will occur again.

[0063] Scenario 4: Planned shutdown

[0064] During planned downtimes such as coating shift changes and cleaning, the coating die head 30 is sealed and the system slurry is circulated to prevent prolonged downtime, which would cause a difference in the slurry between the slurry buffer 20 and the slurry storage 10. Conventional coating machines, which do not have a circulation function between the slurry buffer 20 and the slurry storage 10, can only circulate the slurry within the slurry buffer 20 or between the slurry buffer 20 and the coating die head 30, and cannot maintain consistency with the slurry in the slurry storage 10. This will cause mixing fluctuations again when the machine is started up again.

[0065] Under the above various working conditions, the utility model can greatly reduce the slurry fluctuation problem during feeding and eliminate the slurry change during the coating process.

[0066] From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects: the coating system of the lithium battery slurry is provided with a mixing pipeline, and the mixing pipeline is used to connect the slurry buffer and the slurry storage, so as to realize the circulation flow of the slurry between the slurry storage, the feeding pipeline, the slurry buffer and the mixing pipeline, thereby ensuring the consistency of the viscosity of the slurry in the slurry buffer and the slurry storage. Specifically, in working condition 1 (preparation for class opening), that is, before coating begins, a consistent slurry viscosity can be formed by circulating the slurry in the slurry buffer and the slurry storage, thereby avoiding the fluctuation of slurry mixing in the early stage of class opening; in working condition 2 (continuous coating), after the slurry in the slurry buffer is consumed, due to the slurry storage, the feeding pipeline and the mixing pipeline are used to connect the slurry buffer and the slurry storage, the slurry can be circulated and mixed. The viscosity of the slurry in the slurry buffer section and the mixing pipeline remains consistent, and the slurry storage section can replenish the slurry of the same viscosity in time, which can avoid the viscosity change caused by the mixing of new and old (different viscosities) slurries, thereby maintaining the consistency of the coating slurry, and thus reducing the fluctuation of the coating surface density; in working conditions 3 (abnormal coating stop) and working conditions 4 (planned shutdown), that is, when encountering abnormal coating stop situations such as scraping and breaking, it can immediately switch to the mixing state to prevent the slurry from changing in viscosity or settling due to standing during the shutdown period, thereby maintaining the consistency of the slurry viscosity, and thus reducing the mixing fluctuation when the machine is restarted. In summary, the utility model can ensure the consistency of the slurry at startup, reduce the adjustment time of coating, and thus improve production efficiency.

[0067] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A coating system for lithium battery slurry, characterized in that: It comprises a slurry storage portion (10), a slurry buffer portion (20), a coating die head (30), and at least one power component (40); The lithium battery slurry coating system further includes a material delivery pipeline (51), a material supply pipeline (52) and a material mixing pipeline (53); Under the action of the power component (40), the coating system of the lithium battery slurry has a feeding state in which the slurry storage part (10) feeds the slurry buffer part (20) via the feeding pipeline (52), a coating state in which the slurry buffer part (20) feeds the slurry to the coating die head (30) via the feeding pipeline (51), and a mixing state in which the slurry circulates in the slurry storage part (10), the feeding pipeline (52), the slurry buffer part (20), the mixing pipeline (53) and the slurry storage part (10) in sequence.

2. The lithium battery slurry coating system according to claim 1, characterized in that: The power component (40) is provided on the material delivery pipeline (51), and the power component (40) is provided on the material replenishment pipeline (52).

3. The lithium battery slurry coating system according to claim 2, characterized in that: The lithium battery slurry coating system further comprises a connecting pipeline (54), one end of which is connected to the material delivery pipeline (51), and the other end of which is connected to the material mixing pipeline (53).

4. The lithium battery slurry coating system according to claim 3, characterized in that: The lithium battery slurry coating system further includes a first three-way valve (55), wherein a first end of the first three-way valve (55) is connected to the slurry buffer (20), a second end of the first three-way valve (55) is connected to the connecting pipe (54), and a third end of the first three-way valve (55) is connected to the mixing pipe (53).

5. The lithium battery slurry coating system according to claim 4, characterized in that: The coating system for the lithium battery slurry further includes a second three-way valve (56), wherein a first end of the second three-way valve (56) is connected to the coating die head (30), a second end of the second three-way valve (56) is connected to the connecting pipeline (54), and a third end of the second three-way valve (56) is connected to the feed pipeline (51).

6. The lithium battery slurry coating system according to claim 5, characterized in that: The lithium battery slurry coating system further includes a die head circulation pipeline (57), one end of the die head circulation pipeline (57) is connected to the coating die head (30), and the other end of the die head circulation pipeline (57) is connected to the connecting pipeline (54).

7. The lithium battery slurry coating system according to claim 2, characterized in that: The power component (40) is provided on the mixing pipeline (53); and / or the feeding pipeline (52) is used to connect the slurry storage section (10) and the slurry buffer section (20), the feeding pipeline (51) is used to connect the slurry buffer section (20) and the coating die head (30), and the mixing pipeline (53) is used to connect the slurry buffer section (20) and the slurry storage section (10).

8. The lithium battery slurry coating system according to any one of claims 1 to 7, characterized in that: The slurry storage part (10) includes: Storage tank (11); a driving member (12); The stirring member comprises a rotating shaft (13) and a plurality of stirring members (14), one end of the rotating shaft (13) is connected to the output shaft of the driving member (12), the other end of the rotating shaft (13) extends into the storage tank (11), and the plurality of stirring members (14) are located in the storage tank (11) and connected to the rotating shaft (13).

9. The lithium battery slurry coating system according to claim 8, characterized in that: The plurality of stirring members (14) are arranged at intervals along the radial direction and the axial direction of the rotating shaft (13).

10. The lithium battery slurry coating system according to claim 6, characterized in that: The lithium battery slurry coating system further comprises a controller, and the power component (40), the first three-way valve (55) and the second three-way valve (56) are all controllably connected to the controller.

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