Lithium battery pole piece coating heating equipment

Abstract

The utility model discloses lithium battery pole piece coating and heating equipment, which comprises a feeding roller, a coating head and a drying box, a guide part and a preheating part are sequentially arranged between the feeding roller and the drying box, a plurality of driving rollers and a receiving roller are arranged at the rear end of an output port of the drying box, a base material is wound on the feeding roller, and the coating head is arranged on the receiving roller. A base material sequentially passes through the guide part, the preheating part, the drying box and the transmission roller and then is wound to the material receiving roller, the guide part comprises a first guide roller and a second guide roller which are horizontally arranged, the coating head is located between the first guide roller and the second guide roller, the preheating part comprises a front heating part and a back heating part, and the front heating part and the back heating part are used for heating the front face and the back face of the base material correspondingly. After being coated, the base material is preheated through the preheating part and then enters the drying box to be subjected to secondary drying treatment, so that the coating of the base material is heated uniformly in the drying process, cracks are not prone to being generated, and the coating quality of the base material is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery pole piece coating, and in particular to a lithium battery pole piece coating heating device. Background Art

[0002] In the production process of lithium batteries, coating is to coat the raw materials of power lithium batteries on the conductive substrate of the battery. The positive and negative pole pieces of lithium batteries are produced by this coating method. Specifically, pole piece coating generally refers to a process of coating the stirred slurry evenly on the current collector and drying the solvent in the slurry. Coating is a key process in the preparation of the battery cell. The quality of coating is directly related to the quality of the battery. Pole piece coating is of great significance to the capacity, consistency, safety, etc. of lithium batteries. The effect of pole piece coating has an important impact on the battery capacity, internal resistance, cycle life and safety. Patent CN219309165U in the prior art discloses a pole piece coating drying and winding mechanism. The support frame is provided with a coating mechanism, two first rollers, a second roller, three third rollers and a winding drum driven by a third motor from left to right. The mechanism also includes a drying mechanism and a correction mechanism, but the pole piece substrate is not preheated before the drying mechanism, which is not conducive to further ensuring the uniformity of coating heating and improving the coating quality. Utility Model Content

[0003] The purpose of the utility model is to overcome the above-mentioned defects or problems existing in the background technology and provide a lithium battery pole piece coating heating device.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A lithium battery pole piece coating and heating device comprises a feeding roller, a coating head and a drying box, wherein a guide part and a preheating part are arranged in sequence between the feeding roller and the drying box, a plurality of transmission rollers and a receiving roller are arranged at the rear end of the output port of the drying box, a substrate is wound around the feeding roller, and the substrate is wound around the receiving roller after passing through the guide part, the preheating part, the drying box and the transmission roller in sequence, the guide part comprises a first guide roller and a second guide roller arranged horizontally, the coating head is located between the first guide roller and the second guide roller, the preheating part comprises a front heating part and a back heating part, and the front heating part and the back heating part are used to heat the front and back sides of the substrate respectively.

[0006] In certain embodiments of the present invention, the coating head is directly facing the substrate and arranged above the substrate, and the coating head is used to coat the front side of the substrate.

[0007] In some embodiments of the utility model, a plurality of blowing heads are arranged in the drying box along the transmission direction of the substrate, and the blowing heads are evenly spaced in the drying box.

[0008] In some embodiments of the utility model, the front end of the input port and the rear end of the output port of the drying box are respectively provided with a front end surface density detection group and a rear end surface density detection group, and the front end surface density detection group and the rear end surface density detection group are used to detect the surface density of the substrate.

[0009] In certain embodiments of the utility model, the rear end surface density detection group is arranged between two adjacent transmission rollers, and the front end surface density detection group is arranged between two guide rollers. The guide rollers are located between the preheating part and the drying box, and the guide rollers are used to guide the substrate into the drying box.

[0010] In certain embodiments of the present invention, the transmission roller comprises a first roller group arranged in a staggered manner and a second roller group arranged horizontally, and the rear end surface density detection group is arranged behind the first roller group.

[0011] In some embodiments of the present invention, the front heating portion includes a first heating roller and a second heating roller which are arranged in sequence, and the back heating portion includes a third heating roller.

[0012] In some embodiments of the present invention, a third guide roller is arranged between the first heating roller and the second guide roller, the third guide roller and the first heating roller are arranged horizontally, the first heating roller and the second heating roller are arranged vertically, and the third heating roller is arranged above the second heating roller.

[0013] In some embodiments of the present invention, the third guide roller is arranged below the second guide roller, and the left end of the third guide roller and the right end of the second guide roller are located on the same vertical line.

[0014] In some embodiments of the present invention, the first heating roller, the second heating roller, and the third heating roller are respectively set with a first heating temperature, a second heating temperature, and a third heating temperature, and the first heating temperature, the second heating temperature, and the third heating temperature increase sequentially.

[0015] From the above description of the utility model, it can be seen that compared with the prior art, the utility model has the following beneficial effects:

[0016] 1. After coating, the substrate is first preheated in the preheating section and then enters the drying box for secondary drying, which is conducive to the penetration and conduction of heat energy from the surface to the coating, so that the coating is evenly heated during the drying process and is not prone to cracks, which is conducive to ensuring the coating quality of the substrate.

[0017] 2. The front heating part and the back heating part are used to heat the front and back of the substrate respectively. Double-sided preheating makes the coating heated more evenly and is less likely to crack.

[0018] 3. The front end of the input port and the rear end of the output port of the drying box are respectively provided with a front end surface density detection group and a rear end surface density detection group. The front end surface density detection group is used to detect the surface density of the substrate before entering the drying box, and the rear end surface density detection group is used to detect the surface density of the substrate after being dried and heated in the drying box. The two surface density detection data are compared to further determine whether the substrate coating is uniform, which helps to ensure the coating quality of the substrate. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 It is a structural schematic diagram of the utility model;

[0021] Description of main reference numerals:

[0022] 1. Feeding roller, 2. Coating head, 31. First guide roller, 32. Second guide roller, 33. Third guide roller, 41. First heating roller, 42. Second heating roller, 43. Third heating roller, 5. Drying box, 50. Blowing head, 6. Driving roller, 61. First roller group, 62. Second roller group, 7. Feeding roller, 8. Base material, 91. Front end surface density detection group, 92. Rear end surface density detection group, 93. Guide roller. DETAILED DESCRIPTION

[0023] 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 preferred embodiments of the utility model and should not be regarded as excluding other embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0024] In the claims, specification and the above-mentioned drawings of the utility model, unless otherwise clearly defined, the use of terms such as "first", "second" or "third" etc. is to distinguish different objects rather than to describe a specific order.

[0025] In the claims, specification and the above-mentioned drawings of the utility model, unless otherwise explicitly defined, directional words, such as the terms "center", "lateral", "longitudinal", "horizontal", "vertical", "top", "bottom", "inside", "outside", "up", "down", "front", "back", "left", "right", "clockwise", "counterclockwise", etc., indicating directions or positional relationships are based on the directions and positional relationships shown in the drawings, and are only for the convenience of describing the invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the specific protection scope of the invention.

[0026] In the claims, specification and the above drawings of the utility model, unless otherwise clearly defined, if the term "fixed connection" or "fixed connection" is used, it should be understood in a broad sense, that is, any connection method without a displacement relationship and relative rotation relationship between the two, that is to say, including non-detachable fixed connection, detachable fixed connection, integrated connection and fixed connection through other devices or elements.

[0027] In the claims, specification and drawings of the present utility model, if the terms "include", "have" and their variations are used, they are intended to mean "including but not limited to".

[0028] See also Figure 1 :

[0029] A lithium battery pole piece coating and heating device comprises a discharge roller 1, a coating head 2, and a drying box 5. A guide portion and a preheating portion are arranged in sequence between the discharge roller 1 and the drying box 5. A plurality of transmission rollers 6 and a receiving roller 7 are arranged at the rear end of the output port of the drying box 5. The plurality of transmission rollers 6 jointly assist the movement of a substrate 8 to ensure the transmission efficiency of the substrate 8. The discharge roller 1 is wound with a substrate 8. The substrate 8 is wound to the receiving roller 7 after passing through the guide portion, the preheating portion, the drying box 5, and the transmission roller 6 in sequence. The substrate 8 passing through the drying box 5 is subjected to a secondary drying treatment, so that the coating of the substrate 8 is evenly heated during the drying process and cracks are not easily generated.

[0030] The guide portion includes a first guide roller 31 and a second guide roller 32 which are horizontally arranged. The coating head 2 is located between the first guide roller 31 and the second guide roller 32. The coating head 2 is facing the substrate 8 and is arranged above the substrate 8. The coating head 2 is used to coat the front side of the substrate 8 so that the slurry is evenly coated on the substrate 8.

[0031] The preheating part includes a front heating part and a back heating part. The front side of the substrate 8 bypasses the front heating part, and the back side of the substrate 8 bypasses the back heating part. The front heating part and the back heating part are respectively used to heat the front and back sides of the substrate 8. Double-sided preheating makes the coating heated more evenly and is less likely to produce cracks.

[0032] As an embodiment, the front heating portion includes a first heating roller 41 and a second heating roller 42 which are arranged in sequence, and the back heating portion includes a third heating roller 43 .

[0033] As an embodiment, a third guide roller 33 is arranged between the first heating roller 41 and the second guide roller 32 , and the third guide roller 33 guides the coated substrate 8 to the preheating portion.

[0034] As an embodiment, the third guide roller 33 is arranged below the second guide roller 32, and the left end of the third guide roller 33 and the right end of the second guide roller 32 are located on the same vertical line, so that the substrate 8 reaches the positive heating part horizontally to the right after being guided by the third guide roller 33.

[0035] As an embodiment, the third guide roller 33 and the first heating roller 41 are arranged horizontally, the first heating roller 41 and the second heating roller 42 are arranged vertically, the front side of the substrate 8 bypasses the first heating roller 41 and the second heating roller 42, so that the front side of the substrate 8 is preheated twice, and the third heating roller 43 is arranged above the second heating roller 42, and the substrate 8 bypasses the third heating roller 43 from the other side, so that the back side of the substrate 8 bypasses the third heating roller 43, and the back side of the substrate 8 is preheated. It can be understood that the surfaces of the guide part and the preheating part are anti-sticky to prevent the unheated and solidified coating from sticking.

[0036] As an embodiment, the first heating roller 41, the second heating roller 42, and the third heating roller 43 are respectively set with a first heating temperature, a second heating temperature, and a third heating temperature. The first heating temperature, the second heating temperature, and the third heating temperature increase successively, which is conducive to the penetration and conduction of heat energy from the surface to the coating, so that the coated coating is heated evenly and is not easy to crack.

[0037] It can be understood that the drying heating temperature in the drying box 5 is greater than the third heating temperature.

[0038] As an embodiment, a plurality of blowing heads 50 are arranged in the drying box 5 along the transmission direction of the substrate 8. The blowing heads 50 are evenly spaced in the drying box 5. The blowing heads 50 blow out hot air for drying and heating the applied coating.

[0039] As an implementation mode, a front end surface density detection group 91 and a rear end surface density detection group 92 are respectively provided at the front end of the input port and the rear end of the output port of the drying box 5. The front end surface density detection group 91 is used to detect the surface density of the substrate 8 before entering the drying box 5, and the rear end surface density detection group 92 is used to detect the surface density of the substrate 8 after being dried and heated in the drying box 5. The two surface density detection data are compared to further determine whether the coating of the substrate 8 is uniform, which helps to ensure the coating quality of the substrate 8.

[0040] As an embodiment, the rear end surface density detection group 92 is arranged between two adjacent drive rollers 6 arranged in the horizontal direction, and the front end surface density detection group 91 is arranged between two guide rollers 93. The guide rollers 93 are located between the preheating part and the drying box 5. The guide rollers 93 are used to guide the substrate 8 into the drying box 5. It can be understood that the front end surface density detection group 91 and the rear end surface density detection group 92 are both arranged vertically toward the substrate 8 to facilitate the surface density detection of the substrate 8.

[0041] As an embodiment, the plurality of transmission rollers 6 include a staggered first roller group 61 and a horizontally arranged second roller group 62. It is understandable that the rear end surface density detection group 92 is arranged after the first roller group 61. Preferably, the first roller group 61 is composed of three transmission rollers staggered up and down, and the second roller group 62 is composed of two horizontally arranged transmission rollers. The staggered first roller group 61 is used to tension and straighten the substrate 8 after drying and heating, so as to facilitate the rear end surface density detection group 92 to perform surface density detection of the substrate 8, which helps to ensure the accuracy of surface density detection. The substrate 8 is finally transported to the receiving roller 7 under the action of the transmission roller 6. The receiving roller 7 is used to rewind the substrate 8 that has been coated and passed the density detection.

[0042] The description of the above specification and embodiments is used to explain the protection scope of the utility model, but does not constitute a limitation on the protection scope of the utility model. Through the enlightenment of the utility model or the above embodiments, ordinary technicians in this field can obtain modifications, equivalent replacements or other improvements to the embodiments of the utility model or part of the technical features thereof through logical analysis, reasoning or limited experiments, which should be included in the protection scope of the utility model.

Claims

1. A lithium battery pole piece coating and heating device, characterized in that: It includes a feeding roller, a coating head, and a drying box. A guide part and a preheating part are arranged in sequence between the feeding roller and the drying box. A plurality of transmission rollers and a receiving roller are arranged at the rear end of the output port of the drying box. The feeding roller is wound with a substrate, and the substrate is wound onto the receiving roller after passing through the guide part, the preheating part, the drying box, and the transmission roller in sequence. The guide part includes a first guide roller and a second guide roller which are arranged horizontally. The coating head is located between the first guide roller and the second guide roller. The preheating part includes a front heating part and a back heating part, and the front heating part and the back heating part are used for heating the front and back sides of the substrate respectively.

2. The lithium battery pole piece coating and heating device according to claim 1, characterized in that: The coating head faces the substrate and is arranged above the substrate.

3. The lithium battery pole piece coating and heating device according to claim 1, characterized in that: A plurality of blowing heads are arranged in the drying box along the transmission direction of the substrate, and the blowing heads are evenly spaced in the drying box.

4. The lithium battery pole piece coating and heating device according to claim 1, characterized in that: The front end of the input port and the rear end of the output port of the drying box are respectively provided with a front end surface density detection group and a rear end surface density detection group.

5. The lithium battery pole piece coating and heating device according to claim 4, characterized in that: The rear end surface density detection group is arranged between two adjacent transmission rollers, and the front end surface density detection group is arranged between two guide rollers. The guide rollers are located between the preheating part and the drying box, and the guide rollers are used to guide the substrate into the drying box.

6. The lithium battery pole piece coating and heating device according to claim 5, characterized in that: The transmission rollers include a first roller group arranged in a staggered manner and a second roller group arranged horizontally, and the rear end surface density detection group is arranged behind the first roller group.

7. A lithium battery pole piece coating and heating device according to any one of claims 1 to 6, characterized in that: The front heating portion includes a first heating roller and a second heating roller which are sequentially arranged, and the back heating portion includes a third heating roller.

8. The lithium battery pole piece coating and heating device according to claim 7, characterized in that: A third guide roller is arranged between the first heating roller and the second guide roller. The third guide roller and the first heating roller are arranged horizontally. The first heating roller and the second heating roller are arranged vertically. The third heating roller is arranged above the second heating roller.

9. The lithium battery pole piece coating and heating device according to claim 8, characterized in that: The third guide roller is arranged below the second guide roller, and the left end of the third guide roller and the right end of the second guide roller are located on the same vertical straight line.

10. The lithium battery pole piece coating and heating device according to claim 7, characterized in that: The first heating roller, the second heating roller and the third heating roller are respectively set with a first heating temperature, a second heating temperature and a third heating temperature, and the first heating temperature, the second heating temperature and the third heating temperature increase in sequence.

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