A compact oven

Abstract

The present invention relates to the technical field of lithium battery manufacturing, and specifically to a compact oven. The compact oven is used for coating and drying pole pieces, and includes an oven chamber for accommodating pole pieces, wherein the oven chamber is provided with an air inlet chamber and an air return chamber on both sides of the pole piece, wherein the air inlet chamber is connected to a multi-slot air nozzle for air outlet, and the air return chamber is connected to the oven chamber, wherein the multi-slot air nozzle is provided with a plurality of air outlet slots at one end thereof close to the pole piece. This solution eliminates the form of the upper and lower hulls, and has a simple and compact structure, and the multi-slot air nozzle has good air outlet uniformity, and the pole piece drying efficiency is high.

Description

Technical Field

[0001] The invention relates to the technical field of lithium battery manufacturing, and in particular to a compact oven. Background Art

[0002] In the field of battery manufacturing, pole piece coating is a commonly used technology, mainly used to manufacture positive and negative pole pieces of lithium-ion batteries. Pole piece coating is a printing process that uses a printing machine to evenly coat a slurry mixed with electrode materials and conductive additives on a conductive substrate such as aluminum foil or copper foil. In general, the upper and lower surfaces of the foil are coated with wet slurry to form a coated pole piece, and the wet coated pole piece needs to be dried in an oven to become a dry coated pole piece. Pole piece coating is a very important process in battery manufacturing, which directly affects the performance and quality of the battery, such as the energy density, cycle life, safety and other aspects of the battery.

[0003] In the patent with application number CN 217483175 U, an oven structure for baking lithium battery coated pole pieces is provided, which includes a shell, in which a lower hull and an upper hull are respectively arranged corresponding to the coated pole piece directly below and directly below; an upper air inlet pipe connected to the hot air duct is arranged at the upper end of the upper hull, and upper blowing nozzles arranged perpendicular to the running direction of the coated pole piece are connected to the lower end of the upper hull at equal intervals, and upper exhaust nozzles are arranged between adjacent upper blowing nozzles, and one end of each of the upper exhaust nozzles is connected to a second exhaust cavity extending upward, and the upper end of each of the second exhaust cavities is commonly connected to a third exhaust cavity, and the third exhaust cavity is connected to an exhaust duct that can extend out of the shell near the shell side. Patent CN 215892996U discloses an oven that is easy to maintain and clean, including an upper structure and a lower structure, the upper structure including an upper box body and an upper hull, the lower structure including a lower box body and a lower hull; the upper box body has an opening at the lower part, and the upper hull is arranged at the lower opening of the upper box body; the lower box body has an opening at the top, and the lower hull is arranged at the upper opening of the lower box body; the upper structure and the lower structure are detachable, and the upper structure can be closed together with the lower structure or opened from the lower structure.

[0004] The upper and lower hulls in the oven in the existing patent occupy most of the entire oven, and the volume of the entire oven is relatively large; the air nozzle is in the form of an inner eight-shaped air nozzle, and the air outlet of the air nozzle is the wind from the two slits that is blown toward the pole piece, which has a great influence on the uniformity of the air outlet of the pole piece and is also very destructive to the pole piece; in addition, the slit width of the air nozzle is relatively large, and the air volume is large. As time goes by, heat accumulation causes the temperature to rise, which affects the deformation of the air outlet, thereby affecting the uniformity of the air outlet and the uneven drying of the pole piece, and reducing the efficiency. Summary of the invention

[0005] The present invention is based on the deficiencies existing in the above-mentioned background technology. The purpose of the present invention is to provide a compact oven, which eliminates the upper and lower hull forms, has a simple and compact structure, and has multi-slot air nozzles with good air uniformity and high drying efficiency for the electrode. The structure of the upper and lower hulls of the traditional oven leads to excessive volume, and the existing air nozzle structure has few and wide air slits, low air outlet uniformity, and high electrode drying efficiency.

[0006] To achieve the above object, the present invention is implemented through the following technical solutions:

[0007] A compact oven for coating and drying electrode pieces, comprising an oven chamber for accommodating the electrode pieces, wherein an air inlet chamber and an air return chamber are provided on the upper and lower sides of the electrode pieces in the oven chamber, wherein the air inlet chamber is connected to a multi-slot air nozzle for exhausting air, and the return air chamber is communicated with the oven chamber, and a plurality of air outlet slots are formed on one end of the multi-slot air nozzle close to the electrode piece.

[0008] The air inlet and return air chambers are pipe structures. The pole piece is placed in the middle of the oven chamber. The return air chamber is L-shaped. The relative arrangement of the air inlet and return air chambers replaces the structure of the upper and lower hulls of the existing oven. The structure is simple and more compact, which avoids a large loss of heat. The entire oven is smaller and the cost is lower. Compared with the existing air nozzles, the multi-slit air nozzle has multiple air slits to increase the air blowing area. The air will not gather at one point, which reduces the destructive power on the pole piece, and the air outlet is more uniform, so the pole piece drying efficiency is higher.

[0009] As a further improvement of the present invention, one side of the return air cavity is connected to a plurality of evenly arranged return air ports, and the return air ports are in communication with the oven chamber.

[0010] As a further improvement of the present invention, the return air outlets and the multi-slit air nozzles are arranged alternately and in parallel.

[0011] As a further improvement of the present invention, the return air cavity is further formed with an air outlet, and the air outlet is connected and communicated with the return air outlet.

[0012] As a further improvement of the present invention, the return air port is further provided with a porous return air plate on the end surface facing the pole piece.

[0013] The purpose of setting evenly distributed return air vents is to help maintain uniform temperature and humidity in the oven, thereby ensuring the drying effect. Specifically, the temperature and humidity inside the oven will change due to the drying of the electrode, and the return air chamber can circulate the air inside the oven, so that the electrode can be heated evenly during the drying process, and it can also prevent the electrode from being over-dried or too wet. The setting of the porous return air plate further optimizes the return air effect, thereby ensuring the stable and reliable quality of the manufactured lithium battery.

[0014] As a further improvement of the present invention, an air inlet is formed on one side of the air inlet cavity, and the multi-slit air nozzle is arranged on the other side of the air inlet cavity.

[0015] As a further improvement of the present invention, the multi-slot air nozzle includes an air nozzle air inlet, and the multi-slot air nozzle is connected to the air inlet cavity through the air nozzle air inlet.

[0016] As a further improvement of the present invention, the multi-slot air nozzle further comprises a plurality of arched bent parts arranged in parallel, and the air outlet slots are formed between adjacent arched bent parts.

[0017] As a further improvement of the present invention, a porous air uniforming plate is further provided between the air inlet of the air nozzle and the air outlet slit.

[0018] Compared with the blowing of existing nozzles, the multi-slit nozzles are set to prevent the blowing from being too concentrated, increase the blowing area, and greatly reduce the destructive force on the pole piece. In addition, under the condition that the total air volume remains unchanged, since the width of the multiple slits is smaller than that of the existing nozzles, the air uniformity is good, the pole piece is evenly heated, and the evaporation efficiency is high.

[0019] As a further improvement of the present invention, the width of the air inlet cavity gradually decreases along the wind flow direction, and the width of the air return cavity gradually increases along the wind flow direction.

[0020] Therefore, the beneficial effects of the present invention are:

[0021] (1) The present invention provides a compact oven, which eliminates the upper and lower hull structures and sets an air inlet chamber and an air return chamber. The structure is simple and more compact, which avoids a large loss of heat. The entire oven is smaller in size and has a lower cost.

[0022] (2) By setting a multi-slit air nozzle, including multiple air outlet slits, the concentration of air outlet is reduced while the blowing area is increased, which greatly reduces the destructive force on the electrode. In addition, due to the small slit width, the air outlet is uniform, the electrode is heated evenly, and the evaporation efficiency is high and the effect is good;

[0023] (3) Furthermore, by providing evenly distributed return air vents and a porous return air plate, the temperature and humidity in the oven can be kept uniform, thereby optimizing the drying effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only part of the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 This is a schematic structural diagram of the compact oven of this embodiment;

[0026] Figure 2 Schematic diagram of the structure of the air inlet cavity of this embodiment;

[0027] Figure 3 This is a schematic diagram of the structure of the return air chamber of this embodiment;

[0028] Figure 4 is a cross-sectional view of the multi-slit air nozzle of this embodiment;

[0029] Description of the accompanying drawings, wherein:

[0030] Pole piece 01, oven panel 02, oven chamber 03, air inlet chamber 1, return air chamber 2, multi-slot air nozzle 3, air outlet slot 3-1, air inlet 1-1, air nozzle air inlet 3-2, arched bending part 3-3, multi-porous air uniforming plate 3-4, return air outlet 2-1, air outlet 2-2, multi-porous return air plate 2-3. DETAILED DESCRIPTION

[0031] The technical solutions of the embodiments of the present invention are explained and described below in conjunction with the drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention, not all. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the protection scope of the present invention.

[0032] In the following description, terms such as "inside", "outside", "up", "down", "left", "right", etc. that indicate directions or positional relationships are only used to facilitate the description of the embodiments and simplify the description, and do not indicate or imply that the referred device or element must have a specific direction, be constructed and operate in a specific direction. Therefore, it should not be understood as a limitation of the present invention.

[0033] This embodiment provides a compact oven for coating and drying of pole pieces. Figure 1 The compact oven includes an oven chamber 03 for accommodating the pole piece 01. The oven chamber 03 is formed by assembling the oven panels 02. An air inlet chamber 1 and an air return chamber 2 are provided on both sides of the pole piece 01. The air inlet chamber 1 is connected to a multi-slot air nozzle 3 for air outlet. The air return chamber 2 is connected to the oven chamber 03. A plurality of air outlet slots 3-1 are formed at one end of the multi-slot air nozzle 3 close to the pole piece 01.

[0034] Reference Figure 1 Combined with Figure 2 , Figure 3The air inlet chamber 1 and the return air chamber 2 are of a pipeline structure, the pole piece 01 is placed in the middle of the oven chamber 03, and the return air chamber is L-shaped. The air inlet chamber 1 and the return air chamber 2 are relatively arranged to replace the structure of the upper and lower hulls of the existing oven. The structure is simple and more compact, which avoids a large loss of heat. The entire oven is smaller in size and lower in cost. Compared with the existing air nozzle, the multi-slit air nozzle 3 has a plurality of air outlet slits 3-1 to increase the blowing area, and the blowing will not gather at one point, reducing the destructive power on the pole piece 01. It is particularly worth mentioning that, when the total air output remains unchanged, since the width of the multiple slits is smaller than that of the existing air nozzle, the air outlet is uniform, the pole piece 01 is heated evenly, the evaporation efficiency is high, and the drying effect is good.

[0035] like Figure 3 As shown, one side of the return air cavity 2 is connected to a plurality of evenly arranged return air ports 2-1, the return air ports 2-1 are connected to the oven chamber 03, and the return air ports 2-1 and the multi-slit air nozzles 3 are arranged in a staggered manner. The return air cavity 2 is also formed with an air outlet 2-2, which is connected to the return air cavity 2 and the return air port 2-1. Furthermore, the return air port 2-1 is also provided with a porous return air plate 2-3 on the end surface facing the pole piece 01.

[0036] The purpose of setting evenly distributed return air vents 2-1 is to help maintain uniform temperature and humidity in the oven, thereby ensuring the drying effect. Specifically, the temperature and humidity inside the oven will change due to the drying of the electrode, and the return air chamber 2 can circulate the air inside the oven, so that the electrode 01 can be heated evenly during the drying process, and it can also prevent the electrode from being over-dried or too wet. The setting of the porous return air plate 2-3 further optimizes the return air effect, thereby ensuring the stable and reliable quality of the manufactured lithium battery.

[0037] Combination Figure 2 An air inlet 1 - 1 is formed on one side of the air inlet cavity 1 , and a multi-slit air nozzle 3 is arranged on the other side of the air inlet cavity 1 .

[0038] Reference Figure 4 In the cross-sectional view, the multi-slot air nozzle 3 includes an air nozzle inlet 3-2, and the multi-slot air nozzle 3 is connected to the air inlet chamber 1 through the air nozzle inlet 3-2. The multi-slot air nozzle 3 also includes a plurality of arched bending members 3-3 arranged in parallel, and the arched bending members 3-3 are arranged at the lower end of the air nozzle inlet 3-2, and the air outlet slits 3-1 are formed between adjacent arched bending members 3-3. The drying air flows in from the air nozzle inlet 3-2, flows out through the plurality of air outlet slits 3-1, and acts on the pole piece 01. It should be noted that a multi-porous uniform air plate 3-4 is also provided between the air nozzle inlet 3-2 and the air outlet slit 3-1, which is similar to the structure of the multi-porous return air plate 2-3, and is provided with a plurality of holes to ensure the uniformity of the air outlet and return air.

[0039] It should be noted that the widths of the air inlet cavity 1 and the return air cavity 2 are both gradual, with the width of the air inlet cavity 1 gradually decreasing along the wind flow direction, and the width of the return air cavity 2 gradually increasing along the wind flow direction, and the ratio of the widths of the air inlet cavity 1 and the return air cavity 2 at the head and tail should both satisfy 1:0.35~0.5.

[0040] The present embodiment provides a compact oven, and the gas flow process during the electrode coating and drying operation is as follows:

[0041] The airflow of the entire wind field enters through the air inlet 1-1 of the air inlet chamber 1, then enters the multi-slot air nozzle 3 through the air nozzle inlet 3-2 connected to the air inlet chamber 1, then passes through the porous air uniforming plate 3-4 and the air outlet slit 3-1 of the multi-slot air nozzle 3 to enter the oven chamber 03, and then returns through the return air port 2-1 of the return air chamber 2 connected to the oven chamber 03, and finally the airflow flows out through the air outlet 2-2 of the return air chamber 2.

[0042] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that the present invention includes but is not limited to the contents described in the drawings and the above specific embodiments. Any modification that does not deviate from the functional and structural principles of the present invention will be included in the scope of the claims.

Claims

1. A compact oven for coating and drying of pole pieces, characterized in that: The invention comprises an oven chamber for accommodating an electrode piece, wherein an air inlet chamber (1) and an air return chamber (2) are provided on upper and lower sides of the electrode piece in the oven chamber, the air inlet chamber (1) is connected to a multi-slot air nozzle (3) for discharging air, the air return chamber (2) is communicated with the oven chamber, and a plurality of air outlet slots (3-1) are formed at one end of the multi-slot air nozzle (3) close to the electrode piece; The multi-slot air nozzle (3) comprises an air nozzle air inlet (3-2), and the multi-slot air nozzle is connected to the air inlet cavity (1) via the air nozzle air inlet (3-2); The multi-slot air nozzle (3) further comprises a plurality of arched bent parts (3-3) arranged in parallel, and the air outlet slots (3-1) are formed between adjacent arched bent parts (3-3); A multi-hole air uniforming plate (3-4) is further provided between the air nozzle air inlet (3-2) and the air outlet slit (3-1); One side of the return air chamber (2) is connected to a plurality of evenly arranged return air ports (2-1), and the return air ports (2-1) are in communication with the oven chamber; The return air outlet (2-1) and the multi-slit air nozzle (3) are arranged in a staggered manner and in parallel; The return air chamber (2) is also formed with an air outlet (2-2), and the air outlet is connected and communicated with the return air outlet (2-1); The return air port (2-1) is also provided with a multi-porous return air plate (2-3) on the end surface facing the pole piece; An air inlet (1-1) is formed on one side of the air inlet cavity (1), and the multi-slit air nozzle (3) is arranged on the other side of the air inlet cavity (1); The width of the air inlet cavity (1) gradually decreases along the wind flow direction, and the width of the air return cavity (2) gradually increases along the wind flow direction.

Images