Novel lithium battery pole piece double-sided special-shaped coating system

Abstract

The invention provides a novel lithium battery pole piece double-sided special-shaped coating system which is characterized by comprising a discharging roll for winding a battery pole piece base material, a first passing roller for supporting the battery pole piece base material, and a second passing roller and a third passing roller which are used for supporting the battery pole piece base material and changing the coating direction, the clamping roller is used for pressing the battery pole piece base material and changing the coating direction, the coating steel roller is used for being matched with the first clamping roller and changing the coating direction, and the first special-shaped die head and the second special-shaped die head are used for coating the battery pole piece base material. The novel lithium battery pole piece double-sided special-shaped coating system provided by the invention has the advantages that the working efficiency is high, the pole piece coating quality can be effectively improved, the cost is reduced and the like, and the coating quality is further improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lithium battery coating equipment design, and particularly relates to a novel lithium battery pole piece double-sided special-shaped coating system. BACKGROUND

[0002] Lithium batteries have been more and more widely applied in various fields. People have higher requirements for the charging time of lithium ion batteries. At present, the middle tab structure is widely used to improve the fast charging performance of the battery cell. The middle tab is a hollow foil area formed in a certain position in the positive and negative pole piece by a certain method, and the tab is welded in the hollow foil area. The special-shaped coating at present is still in a small-batch production state, and the production mode is basically a return type, that is, one side is coated first, then dried, and then coated and dried again, so that the manufacturing cycle is long and the manufacturing cost is increased, and therefore, further improvement is needed. SUMMARY

[0003] The present application provides a novel lithium battery pole piece double-sided special-shaped coating system with high work efficiency, which can effectively improve the pole piece coating quality and reduce the cost.

[0004] The technical scheme adopted by the present application to solve the above problems is as follows:

[0005] The present application provides a novel lithium battery pole piece double-sided special-shaped coating system, characterized in that it comprises:

[0006] a material roll for winding a battery pole piece base material,

[0007] a first over roller for supporting the battery pole piece base material,

[0008] a second over roller and a third over roller for supporting the battery pole piece base material and changing the coating direction,

[0009] a pinch roller for flattening and changing the coating direction of the battery pole piece base material,

[0010] a coating steel roller for cooperating with the first pinch roller and changing the coating direction,

[0011] a first special-shaped die and a second special-shaped die for coating the battery pole piece base material.

[0012] Further, the first over roller, the second over roller, the third over roller, the pinch roller and the first special-shaped die are arranged on the back surface of the battery pole piece base material.

[0013] Further, the first special-shaped die is arranged at the contact surface of the coating steel roller and the battery pole piece base material.

[0014] Further, a thickness gauge is further included for detecting the thickness of the battery electrode sheet substrate after being flattened by the pinch roller and the coating steel roller and coated by the first die.

[0015] Further, a fourth pinch roller and a fifth pinch roller for changing the coating direction of the battery electrode sheet substrate are further included, and the coating steel roller and the fourth and fifth pinch rollers are arranged on the front surface of the battery electrode sheet substrate.

[0016] Further, a first pinch roller assembly is arranged at the fifth pinch roller, and the first pinch roller assembly and the fifth pinch roller are arranged on the back surface and the front surface of the battery electrode sheet substrate respectively for fixing the battery electrode sheet substrate.

[0017] Further, a second pinch roller assembly and a third pinch roller assembly are further included, and the second pinch roller assembly and the third pinch roller assembly are symmetrically arranged on the back surface and the front surface of the battery electrode sheet substrate respectively for fixing the battery electrode sheet substrate.

[0018] Further, the second profiled die is arranged between the third pinch roller assembly and the fifth pinch roller for coating the front surface of the battery electrode sheet substrate.

[0019] Further, the first profiled die is connected with a storage device through a first siphon valve and a first material pump, and the second profiled die is connected with the storage device through a second siphon valve and a second material pump.

[0020] Further, a drying device is further included for drying the battery electrode sheet substrate coated on the front and back surfaces.

[0021] A sixth pinch roller and a traction roller for changing the conveying direction of the battery electrode sheet substrate after being coated and dried on both surfaces, and a third pinch roller is arranged at the traction roller for changing the conveying direction of the battery electrode sheet substrate.

[0022] A material receiving roll for receiving the battery electrode sheet substrate after being coated on both surfaces.

[0023] The present application has the following advantages:

[0024] The present application provides a novel lithium battery electrode sheet double-sided profiled coating system with high work efficiency, which can effectively improve the electrode sheet coating quality and reduce the cost. In the design process, the lithium battery electrode sheet substrate back surface and front surface are simultaneously coated, which greatly improves the coating efficiency, saves energy efficiency, reduces production cost, and further improves the coating quality due to the unique design of the application. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1is a structural principle diagram of a novel lithium battery pole piece double-sided special-shaped coating system of the present application;

[0026] Figure 2 is a partial structural principle diagram of a novel lithium battery pole piece double-sided special-shaped coating system of the present application;

[0027] Figure 3 is another partial structural principle diagram of a novel lithium battery pole piece double-sided special-shaped coating system of the present application;

[0028] Figure 4 is a working schematic diagram of a novel lithium battery pole piece double-sided special-shaped coating system of the present application;

[0029] Figure 5 is a fifth over roller and first pinch roller assembly component structural diagram of a novel lithium battery pole piece double-sided special-shaped coating system of the present application;

[0030] Figure 6 is a second pinch roller assembly and third pinch roller assembly structural diagram of a novel lithium battery pole piece double-sided special-shaped coating system of the present application;

[0031] Figure 7 is a coating working schematic of a novel lithium battery pole piece double-sided special-shaped coating system of the present application.

[0032] Figure 8 is a different coating pattern diagram of a novel lithium battery pole piece double-sided special-shaped coating system of the present application. DETAILED DESCRIPTION

[0033] The embodiments of the present application will be described in detail below with reference to the accompanying drawings, which are used only for reference and illustration, and do not constitute a limitation on the scope of patent protection of the present application.

[0034] As shown in Figures 1-3 , the present application provides a novel lithium battery pole piece double-sided special-shaped coating system, comprising:

[0035] a feed roll 2 for winding a battery pole piece base material 1,

[0036] a first over roller 3 for supporting the battery pole piece base material 1,

[0037] a second over roller 4 and a third over roller 5 for supporting the battery pole piece base material 1 and changing the coating direction,

[0038] a first pinch roller 6 for flattening and changing the coating direction of the battery pole piece base material 1,

[0039] a coating steel roller 7 for cooperating with the first pinch roller 6 and changing the coating direction,

[0040] A first profiled die 8 and a second profiled die 9 are used for coating the battery electrode tab substrate 1.

[0041] In this embodiment, the first roller 3, the second roller 4, the third roller 5, the pinch roller and the first profiled die are arranged on the reverse side of the battery electrode tab substrate 1.

[0042] In this embodiment, the first profiled die is arranged at the contact surface between the coating steel roller 7 and the battery electrode tab substrate 1.

[0043] In this embodiment, a thickness gauge 10 is further included for detecting the thickness of the battery electrode tab substrate 1 after being flattened by the pinch roller and the coating steel roller 7 and being coated by the first profiled die.

[0044] In this embodiment, a fourth roller 12 and a fifth roller 13 are further included for changing the coating direction of the battery electrode tab substrate 1, and the coating steel roller 7, the fourth roller 12 and the fifth roller 13 are arranged on the front side of the battery electrode tab substrate 1.

[0045] In this embodiment, a first pinch wheel assembly 14 is arranged at the fifth roller 13, and the first pinch wheel assembly 14 and the fifth roller 13 are arranged on the reverse side and the front side of the battery electrode tab substrate 1 respectively for fixing the battery electrode tab substrate 1.

[0046] In this embodiment, a second pinch wheel assembly 15 and a third pinch wheel assembly 16 are further included, and the second pinch wheel assembly 15 and the third pinch wheel assembly 16 are symmetrically arranged on the reverse side and the front side of the battery electrode tab substrate 1 respectively for fixing the battery electrode tab substrate 1.

[0047] In this embodiment, the second profiled die 9 is arranged between the third pinch wheel assembly 16 and the fifth roller 13 for coating the front side of the battery electrode tab substrate 1.

[0048] In this embodiment, the first profiled die 8 is connected with a storage device 17 through a first siphon valve 801 and a first material pump 802, and the second profiled die 9 is connected with the storage device 17 through a second siphon valve 901 and a second material pump 902.

[0049] In this embodiment, a drying device 18 (1801 air nozzle) is further included for drying the battery electrode tab substrate 1 coated on the front and reverse sides.

[0050] A sixth roller 19 and a traction roller 20 are further included for changing the conveying direction of the battery electrode tab substrate 1 after being coated and dried on both sides, and the traction roller 20 is provided with a third pinch roller 21, and a seventh roller 22 is further included for changing the conveying direction of the battery electrode tab substrate 1,

[0051] Take-up roll 23 is used to store the double-coated battery electrode substrate 1.

[0052] The following is a further explanation with reference to specific embodiments:

[0053] like Figures 4-7 As shown, the battery electrode substrate passes through the first irregularly shaped die 8, where the battery slurry is coated onto the battery electrode substrate. The electrode is then guided into the second irregularly shaped die 9 by the fifth roller 13 for coating of the front slurry. The first clamping roller assembly 14 is added to both ends of the small roller on the upper side of the electrode in front of the second irregularly shaped die 9 to increase the stability of the electrode. At the same time, the second clamping roller assembly 15 and the third clamping roller assembly 16 are added on both sides behind the front coating die to clamp the uncoated areas on both sides of the electrode. The coated electrode substrate enters the suspension oven for baking.

[0054] like Figure 2 The double-sided coating composite roller and clamping roller are positioned on the electrode sheet. The first irregularly shaped die head 8 on the reverse side is fixed, and the second irregularly shaped die head 9 on the reverse side is connected by a precision guiding device and a precision displacement driving device for easy maintenance and tape threading. During coating, the substrate before and after coating is clamped by the substrate clamping roller (i.e., the combination of the fifth roller 13 and the first clamping roller assembly 14 in the figure) or the clamping roller (i.e., the combination of the second clamping roller assembly 15 and the third clamping roller assembly 16 in the figure), which prevents the substrate or electrode sheet in the coating area from shaking due to coating extrusion pressure or belt tension fluctuations, thereby improving the coating surface density accuracy.

[0055] To address the issue of material leakage at the lip of the non-standard die head, a siphon valve is added to the feed pipe of the coating die head to prevent leakage. The purpose is to open the siphon valve simultaneously after the pneumatic three-way valve of the feed pipe is closed, drawing the slurry inside the die head into the siphon valve, thereby preventing the slurry from overflowing from the die head lip.

[0056] This invention enables simultaneous coating of irregular shapes on both sides, reducing the production cost of irregular shape coating. At the same time, by adding clamping rollers on both sides of the coating equipment (i.e., the combination of the second clamping roller assembly 15 and the third clamping roller assembly 16 in the figure), the battery electrode sheet is tensioned, reducing the vibration of the electrode sheet.

[0057] Because the electrode itself has weight, the electrode will be concave in some areas. By using the fifth roller 13 and the first clamping roller assembly 14 (as shown in the figure) or the clamping roller (the second clamping roller assembly 15 and the third clamping roller assembly 16 (as shown in the figure) to clamp it, the uniformity of the distance between the die lip and the electrode is improved, the surface density quality of the coating is improved, and the peel strength between the substrate and the coating layer is improved.

[0058] 3. Compared to the second coating die position where two drying cycles are required, the conventional coating head device is eliminated, saving equipment costs and installation space;

[0059] The use of the siphon valve avoids die leakage, improves the quality of the pole piece, and improves the thinning tail problem of the die.

[0060] As Figure 8 shown, the present application can also be more according to actual needs for different coating pattern operation.

[0061] The novel lithium battery pole piece double-sided special-shaped coating system has the advantages of high working efficiency, effectively improved pole piece coating quality, and reduced cost, etc., in the design process, the lithium battery pole piece substrate 1 reverse side and reverse side are coated at the same time, which greatly improves the coating efficiency, saves energy efficiency, and reduces the production cost, in addition, due to the unique design of the application, the stability of the substrate during the coating process is greatly increased, and the coating quality is further improved.

[0062] The above embodiments are the preferred embodiments of the present application, but the embodiments of the present application are not limited to the above embodiments, any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present application, should be equivalent replacement mode, all included in the protection scope of the present application.

Claims

1. A novel double-sided irregular-shaped coating system for lithium battery electrodes, characterized in that, include: A feed roll used for winding battery electrode substrate. The first roller is used to support the battery electrode substrate. The second and third rollers are used to support the battery electrode substrate and change the coating direction. Clamping rollers used to flatten battery electrode substrates and change the coating direction. A coating steel roller used to cooperate with the first clamping roller and change the coating direction. First and second shaped die heads for coating the battery electrode substrate.

2. The novel double-sided irregular-shaped coating system for lithium battery electrodes according to claim 1, characterized in that: The first through roller, the second through roller, the third through roller, the clamping roller, and the first irregular die head are located on the reverse side of the battery electrode substrate.

3. The novel double-sided irregular-shaped coating system for lithium battery electrodes according to claim 1, characterized in that: The first irregularly shaped die head is located at the contact surface between the coating steel roller and the battery electrode substrate.

4. The novel double-sided irregular-shaped coating system for lithium battery electrodes according to claim 1, characterized in that: It also includes a thickness gauge for detecting the thickness of the battery electrode substrate after it has been flattened by the clamping roller and the coating steel roller and coated by the first die.

5. A novel double-sided irregular-shaped coating system for lithium battery electrodes according to claim 1, characterized in that: It also includes a fourth and a fifth roller for changing the coating direction of the battery electrode substrate, wherein the coating steel roller and the fourth and fifth rollers are disposed on the front side of the battery electrode substrate.

6. A novel double-sided irregular-shaped coating system for lithium battery electrodes according to claim 5, characterized in that: The fifth roller is provided with a first clamping roller assembly. The first clamping roller assembly and the fifth roller are respectively located on the reverse side and the front side of the battery electrode substrate, and are used to fix the battery electrode substrate.

7. A novel double-sided irregular-shaped coating system for lithium battery electrodes according to claim 5, characterized in that: It also includes a second clamping wheel assembly and a third clamping wheel assembly, which are symmetrically arranged on the reverse and front sides of the battery electrode substrate, respectively, for fixing the battery electrode substrate.

8. A novel double-sided irregular-shaped coating system for lithium battery electrodes according to claim 5, characterized in that: The second irregular die head is provided between the third clamping roller assembly and the fifth roller, for coating the front side of the battery electrode substrate.

9. A novel double-sided irregular-shaped coating system for lithium battery electrodes according to claim 1, characterized in that: The first irregularly shaped die head is connected to a material storage device via a first siphon valve and a first material pump, and the second irregularly shaped die head is connected to the material storage device via a second siphon valve and a second material pump.

10. A novel double-sided irregular-shaped coating system for lithium battery electrodes according to claim 1, characterized in that: It also includes a drying device for drying the battery electrode substrates coated on both sides. A sixth conveying roller and a traction roller are used to change the conveying direction of the battery electrode substrate after double-sided coating and drying. A third clamping roller is provided at the traction roller. A seventh conveying roller is used to change the conveying direction of the battery electrode substrate. Take-up rolls used to store double-coated battery electrode substrates.

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