Battery cell baking device

Abstract

In order to solve the problems of poor drying and dewatering consistency, long baking time and high energy consumption of battery cell baking equipment in the prior art, the utility model provides a battery cell baking device which is used for baking moisture of a battery cell. The battery cell baking device is used for baking and removing moisture of the battery cell; the battery cell baking device comprises a high-temperature gas pipeline, a vacuum pipeline and a plurality of baking units, each baking unit comprises a cavity and a heating plate, each heating plate is arranged in the corresponding cavity, and each battery cell is tightly attached to the corresponding heating plate when being arranged in the corresponding cavity. And the cavity is selectively communicated with the high-temperature gas pipeline or the vacuum pipeline. The battery cell baking device provided by the utility model is beneficial to improving the drying and dewatering consistency of the battery cell, the cavity accelerates the drying speed of the battery cell under the synergistic effect of the high-temperature gas and the heating plate, and compared with the prior art, the battery cell baking device achieves an effective drying effect in a short time, and reduces the energy consumption in the drying process of the battery cell at the same time.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery pole piece dewatering, and in particular relates to a battery core baking device. Background Art

[0002] The cell baking technology is used in the lithium battery production process to dry the battery casing, pole pieces, pole rolls and battery cells to ensure the performance and safety of the battery. Since the cell baking technology is a key process in battery manufacturing, the moisture content inside the battery cell is related to the final performance of the battery cell.

[0003] The overall structure of the existing baking equipment generally includes a baking cavity, a heating device and a door structure. Multiple batteries or cells that need to be dried are placed in the baking cavity for unified heating. Since the uniformity of the electrode slurry and the uniformity of the electrode coating may be different in the specific preparation process of a single battery cell, there are differences between the finally prepared battery cells. When the same heating temperature is used for drying, it is difficult to ensure the consistency of the battery cell drying. For individual battery cells, there are problems of incomplete drying or over-drying, which is not conducive to improving the overall performance of the battery. In addition, since the baking cavity space is large, it takes a certain amount of time for the temperature of the battery cell to rise from the surface to the inside when heated to the set temperature, which may cause the entire baking process to be longer and consume more energy, and is not conducive to saving production costs. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a battery cell baking device in view of the problems of poor consistency of drying and water removal, long baking time and high energy consumption of battery cell baking equipment in the prior art.

[0005] The technical solution adopted by the utility model to solve the above technical problems is as follows:

[0006] Provided is a battery cell baking device, which is used for baking to remove moisture from battery cells; the battery cell baking device comprises a high-temperature gas pipeline, a vacuum pipeline and a plurality of baking units, wherein a single baking unit comprises a cavity and a heating plate, the heating plate is arranged in the cavity, a single battery cell is placed inside the single cavity and is in close contact with the heating plate, and the cavity can be selectively connected to the high-temperature gas pipeline or the vacuum pipeline.

[0007] Optionally, a single baking unit includes a first shell, a second shell and an insulation layer, the second shell is located in the first shell, and the insulation layer is located between the outer wall of the second shell and the inner wall of the first shell, and the cavity is formed in the second shell.

[0008] Optionally, the insulation layer is made of glass fiber, quartz fiber or ceramic fiber.

[0009] Optionally, a single baking unit further includes a sealing ring, the cavity is a semi-enclosed structure with an opening on one side, a groove is provided on the first shell at an outer peripheral position surrounding the cavity opening, and the sealing ring is partially embedded in the groove;

[0010] The cell baking device further comprises a connecting frame and a cavity cover, wherein the plurality of baking units are arranged on the connecting frame, and the openings of the plurality of cavities are oriented in the same direction, and the cavity cover is slidably arranged on the connecting frame, and the cavity cover is used to close the openings of the plurality of cavities;

[0011] In the open state, the cavity cover is placed above or below the plurality of baking units; in the closed state, the cavity cover slides to the position of the plurality of baking units and contacts the sealing ring to seal the opening of the cavity.

[0012] Optionally, the battery cell baking device further comprises a base, and the connecting frame is mounted on the base.

[0013] Optionally, the connecting frame and the base are made of stainless steel or aluminum alloy.

[0014] Optionally, a single baking unit further includes a vent hole, and the vent hole can be selectively connected to the high-temperature gas pipeline or the vacuum pipeline.

[0015] Optionally, a single baking unit further includes a ventilation duct, which is respectively connected to the vent hole, the high-temperature gas duct and the vacuum duct.

[0016] Optionally, a vacuum pipeline control valve is provided on the vacuum pipeline, and a gas pipeline control valve is provided on the high-temperature gas pipeline.

[0017] Optionally, a heating device is further included, wherein the heating device is provided with an air inlet and is connected to the high-temperature gas pipeline.

[0018] The battery cell baking device provided by the utility model comprises a plurality of baking units, and a single baking unit comprises a cavity and a heating plate, wherein the heating plate is arranged in the cavity, and a single battery cell is placed inside the single cavity and in close contact with the heating plate. This arrangement places a single battery cell to be baked into the cavity of the baking unit, that is, each battery cell is correspondingly placed in a separate drying cavity during the drying process. Compared with the operation of placing a plurality of battery cells in a common baking cavity for uniform heating at the same time in the prior art, the battery cell baking device provided by the utility model can effectively improve the consistency of drying and dehydrating the battery cells. In addition, a heating plate is arranged in the cavity, and when the battery cells to be baked are After the core is placed in the cavity, the battery core and the heating plate are in a close contact state. At this time, in addition to utilizing the high temperature of the cavity for drying, the battery core also replaces the high-temperature gas in the cavity through the high-temperature gas pipeline and the vacuum pipeline, thereby improving the heat conduction efficiency of the high-temperature gas in the cavity. Under the synergistic effect of the high-temperature gas and the heating plate, the cavity greatly accelerates the drying speed of the battery core. Compared with the prior art, the utility model can achieve an effective drying effect in a short time, thereby also reducing the energy consumption in the battery core drying process; in addition, a single baking unit corresponding to a single battery core is also conducive to improving the spatial utilization of the heating cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a front view of the baking unit provided by the utility model;

[0020] Figure 2 This is an exploded diagram of a baking unit provided by the utility model;

[0021] Figure 3 This is the overall structural diagram of the baking unit provided by the utility model;

[0022] Figure 4 This is a front view of the battery core baking device provided by the utility model;

[0023] Figure 5 This is a rear view of the battery core baking device provided by the utility model;

[0024] Figure 6 It is a three-dimensional structural schematic diagram of a battery core baking device provided by the utility model.

[0025] The reference numerals in the drawings of the specification are as follows:

[0026] 1. Connecting frame; 2. Heating device; 21. Air inlet; 3. Baking unit; 31. Cavity; 32. Heating plate; 33. Second shell; 34. Insulation layer; 35. First shell; 36. Sealing ring; 37. Groove; 4. Cavity cover; 5. Vent hole; 6. Ventilation duct; 7. Base; 8. High-temperature gas duct; 81. Gas duct control valve; 9. Vacuum duct; 91. Vacuum duct control valve. DETAILED DESCRIPTION

[0027] In order to make the technical problems, technical solutions and beneficial effects solved by the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0028] In the description of the present invention, it should be understood that the terms "longitudinal", "radial", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] An embodiment of the utility model provides a battery cell baking device, which is used for baking to remove moisture from battery cells; the battery cell baking device includes a high-temperature gas pipeline 8, a vacuum pipeline 9 and a plurality of baking units 3, wherein a single baking unit 3 includes a cavity 31 and a heating plate 32, wherein the heating plate 32 is arranged in the cavity 31, and a single battery cell is placed inside the single cavity 31 and is tightly attached to the heating plate 32, and the cavity 31 can be selectively connected to the high-temperature gas pipeline 8 or the vacuum pipeline 9.

[0031] It should be noted that the battery cell baking equipment plays a vital role in the battery manufacturing process. It is used to remove moisture that may enter during the production process to ensure the safety and reliability of the finished battery cells. However, the existing baking equipment has some limitations, including poor consistency in drying and dehydration, long baking time, and high energy consumption. During the drying process of the battery cells, the uneven temperature control of the baking equipment or the uneven placement of materials during the baking process leads to poor consistency in drying and dehydration of the battery cells. In addition, the standard baking time of the existing baking equipment may take up to eight hours or more, which not only increases the production cycle and energy consumption, but also reduces production efficiency. In addition, the long baking process will naturally lead to higher energy consumption, which is not conducive to cost control. In order to solve the problems arising from the above baking process, it is necessary to explore and innovate new drying and dehydration equipment.

[0032] Specifically, the battery cell baking device provided by the utility model includes multiple baking units 3, and each of the baking units 3 includes a cavity 31 and a heating plate 32, the heating plate 32 is arranged in the cavity 31, and a single battery cell is placed inside the single cavity 31 and is in close contact with the heating plate 32. This arrangement places a single battery cell to be baked into the cavity 31 of the baking unit 3, that is, each battery cell is placed in a separate drying cavity during the drying process. Compared with the operation of placing multiple battery cells in a common baking cavity 31 for uniform heating in the prior art, the battery cell baking device provided by the utility model can effectively improve the consistency of drying and dehydrating the battery cells. In addition, a heating plate 32 is arranged in the cavity 31. When After the battery cell to be baked is placed in the cavity 31, the battery cell and the heating plate 32 are in a close contact state. At this time, in addition to utilizing the high temperature of the cavity 31 for drying, the battery cell also replaces the high-temperature gas in the cavity 31 through the high-temperature gas pipe 8 and the vacuum pipe 9, thereby improving the heat conduction efficiency of the high-temperature gas in the cavity 31. Under the synergistic effect of the high temperature and the heating plate 32, the drying speed of the battery cell is greatly accelerated. Compared with the prior art, the utility model can achieve an effective drying effect in a short time, thereby also reducing the energy consumption in the drying process of the battery cell; in addition, a single baking unit 3 corresponding to a single battery cell is also conducive to improving the spatial utilization of the heating cavity 31.

[0033] In one embodiment, the single baking unit 3 includes a first shell 35, a second shell 33 and an insulation layer 34, the second shell 33 is located in the first shell 35, and the insulation layer 34 is located between the outer wall of the second shell 33 and the inner wall of the first shell 35, and the cavity 31 is formed in the second shell 33.

[0034] Specifically, the purpose of providing the thermal insulation layer 34 is to avoid heat loss during the high-temperature heating and drying process of the battery cell; the thermal insulation layer 34 is provided between the outer wall of the second shell 33 and the inner wall of the first shell 35, the cavity 31 is formed in the second shell 33, and a single battery cell is placed in the cavity 31. At this time, the cavity 31 is in a state of being covered by the thermal insulation layer 34, and then the thermal insulation layer 34 can exert the thermal insulation effect on the cavity 31, avoid or delay heat loss, maintain the baking temperature of the cavity 31, and then dry the battery cell more efficiently, which is also beneficial to reduce energy consumption on the basis of ensuring the battery cell drying effect.

[0035] In terms of the structure of a single baking unit 3, the first shell 35 is located at the outermost layer of the single baking unit 3. The first shell 35 is generally made of iron plate or stainless steel plate and has good firmness. It can not only protect the internal structural parts but also further play a role in heat preservation of the cavity 31.

[0036] In one embodiment, the insulation layer 34 is made of glass fiber, quartz fiber or ceramic fiber.

[0037] Specifically, in addition to the thermal insulation function, the thermal insulation layer 34 also needs to have high temperature resistance. Preferably, the thermal insulation layer 34 is made of quartz fiber, specifically quartz wool. The thermal insulation layer 34 described in the present application may also be made of other materials with thermal insulation properties. In addition, the thickness of the thermal insulation layer 34 may be determined according to the operating temperature of the baking device and the thermal conductivity of the thermal insulation material. Generally speaking, the greater the thickness of the thermal insulation layer, the smaller the heat loss and the higher the thermal efficiency.

[0038] In one embodiment, the single baking unit 3 further includes a sealing ring 36, the cavity 31 is a semi-enclosed structure with one side open, a groove 37 is provided on the first shell 35 around the outer periphery of the opening of the cavity 31, and the sealing ring 36 is partially embedded in the groove 37;

[0039] The cell baking device further comprises a connecting frame 1 and a cavity cover 4, wherein the plurality of baking units 3 are arranged on the connecting frame 1, and the openings of the plurality of cavities 31 are oriented in the same direction, and the cavity cover 4 is slidably arranged on the connecting frame 1, and the cavity cover 4 is used to close the openings of the plurality of cavities 31;

[0040] In the open state, the cavity cover 4 is placed above or below the plurality of baking units 3 . In the closed state, the cavity cover 4 slides to the position of the plurality of baking units 3 and contacts the sealing ring 36 to seal the opening of the cavity 31 .

[0041] Specifically, the sealing ring 36 is embedded in the groove 37, which can effectively seal the cover plate or cavity cover 4 that seals the baking unit 3 during subsequent baking and drying, thereby ensuring that the heat inside the baking unit 3 is not lost.

[0042] Specifically, a single cavity cover 4 corresponds to the baking unit 3 arranged in the cover array, and a corresponding slide rail is arranged on the connecting frame 1. The cavity cover 4 is correspondingly installed in the slide rail. When the baking unit 3 needs to be covered, the cavity cover 4 only needs to be slid to complete the closure of the multiple baking units 3 in each array. Since the baking unit 3 is provided with the sealing ring 36, a tight sealing connection will be formed after the cavity cover 4 contacts the sealing ring 36 during the covering process; specifically, the cavity cover 4 can be arranged above or below the baking units 3 arranged in the array, and can be slid to the corresponding position by the slide rail to close the baking unit 3 when it needs to be closed. On the other hand, the battery cell baking device described in the present application does not need to be provided with a single cavity cover for the baking unit 3, which saves the time of opening and closing the single cavity cover 4 after the battery cell baking starts and is completed. Compared with the setting of a single cavity cover 4 corresponding to a single baking unit 3, it is also conducive to saving the manufacturing cost of the cavity cover 4.

[0043] In one embodiment, the battery cell baking device further comprises a base 7 , and the connecting frame 1 is mounted on the base 7 .

[0044] After the connecting frame 1 is connected to the base 7, the stability of the overall connection of the battery cell baking device can be improved or increased. In addition, the battery cell baking device can be placed perpendicular to the ground or directly parallel to the ground. The specific operation can be performed according to actual needs. Compared with traditional baking equipment, the second battery cell baking device of the present application is more flexible to use and is also beneficial to reducing the footprint of the baking device to a certain extent.

[0045] In one embodiment, the connecting frame 1 and the base 7 are made of stainless steel or aluminum alloy.

[0046] Battery baking is a key step in the battery manufacturing process, which is mainly used to remove moisture inside the battery cell to improve the performance and safety of the battery. In this process, the material selection of the battery baking device is crucial. The connecting frame 1 plays a connecting and supporting role in the baking device. The base 7, as the foundation of the battery baking device, needs to have strong supporting performance to ensure the stability of the equipment during the baking process; stainless steel has excellent high temperature resistance and corrosion resistance, can withstand the high temperature environment during the baking process, and is not easily corroded, ensuring the long-term stable operation of the equipment. Aluminum alloy has a light weight and good thermal conductivity. Aluminum alloy is light in weight, which can reduce the overall weight of the equipment while ensuring effective heat transfer.

[0047] In one embodiment, the single baking unit 3 further includes a vent hole 5 , and the vent hole 5 can be selectively connected to the high-temperature gas pipeline 8 or the vacuum pipeline 9 .

[0048] Specifically, the vent hole 5 is arranged at a side wall position away from the opening of the cavity 31. When the baking device is performing a cell drying process, the vent hole 5 is connected to the high-temperature gas pipeline 8. After the protective gas is heat-treated by the high-temperature gas pipeline 8, it enters the cavity 31 of the single baking unit 3 for moisture replacement; the replaced moisture is discharged through the vacuum pipeline 9, and at this time, the vent hole 5 is connected to the vacuum pipeline 9.

[0049] In one embodiment, the single baking unit 3 further includes a ventilation pipe 6 , and the ventilation pipe 6 is respectively connected to the ventilation hole 5 , the high-temperature gas pipe 8 and the vacuum pipe 9 .

[0050] Specifically, in the battery cell baking device, the ventilation duct 6 is used for the introduction of protective gas during water replacement and the discharge of generated water from the ventilation duct 6 .

[0051] In one embodiment, a vacuum pipeline control valve 91 is provided on the vacuum pipeline 9 , and a gas pipeline control valve 81 is provided on the high-temperature gas pipeline 8 .

[0052] The vacuum pipeline control valve 91 is mainly used to control the opening or closing state of the vacuum pipeline 9 , and the gas pipeline control valve 81 is used to control the opening or closing state of the high-temperature gas pipeline 8 .

[0053] In one embodiment, a heating device 2 is further included. The heating device 2 is provided with an air inlet 21 . The heating device 2 is connected to the high-temperature gas pipeline 8 .

[0054] Specifically, the introduction of protective gas can replace the moisture in the battery cells in the cavity 31. Therefore, the purpose of setting the air inlet 21 is to introduce protective gas. The protective gas is introduced through the air inlet 21 and heat-treated in the heating device 2. The heat-treated protective gas is introduced into the ventilation pipe 6 through the high-temperature gas pipe 8. The ventilation pipe is connected to the vent hole 5, and then the protective gas is introduced into the baking unit 3 to replace the moisture. The moisture formed in the baking unit 3 after the replacement needs to be discharged. At this time, the gas pipe control valve 81 is closed, and the vacuum pipe control valve 91 is opened. The replaced moisture is discharged through the vacuum pipe 9; in addition, after the baking is completed, the baking unit 3 still has a high temperature, which is not convenient for directly taking the battery cells. In this case, the air inlet 21 and the high-temperature gas pipe 8 can also be used to input dry cooling gas into the cavity 31 and discharge it through the vacuum pipe 9. The temperature of the cavity 31 is gradually reduced by circulating the cooling gas, and the cooling gas is dry gas, so it will not affect the baking quality of the battery cells.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery cell baking device, characterized in that: The battery cell baking device is used for baking and removing moisture from the battery cells; the battery cell baking device comprises a high-temperature gas pipeline, a vacuum pipeline and a plurality of baking units, a single baking unit comprises a cavity and a heating plate, the heating plate is arranged in the cavity, a single battery cell is placed inside the single cavity and is closely attached to the heating plate, and the cavity can be selectively connected to the high-temperature gas pipeline or the vacuum pipeline.

2. A battery cell baking device according to claim 1, characterized in that: A single baking unit comprises a first shell, a second shell and a heat preservation layer, the second shell is located in the first shell, and the heat preservation layer is located between the outer wall of the second shell and the inner wall of the first shell, and the cavity is formed in the second shell.

3. A battery cell baking device according to claim 2, characterized in that: The insulation layer is made of glass fiber, quartz fiber or ceramic fiber.

4. The battery cell baking device according to claim 2, characterized in that: The single baking unit further includes a sealing ring, the cavity is a semi-enclosed structure with an opening on one side, a groove is provided on the first shell around the outer circumference of the cavity opening, and the sealing ring is partially embedded in the groove; The cell baking device further comprises a connecting frame and a cavity cover, wherein the plurality of baking units are arranged on the connecting frame, and the openings of the plurality of cavities are oriented in the same direction, and the cavity cover is slidably arranged on the connecting frame, and the cavity cover is used to close the openings of the plurality of cavities; In the open state, the cavity cover is placed above or below the plurality of baking units; in the closed state, the cavity cover slides to the position of the plurality of baking units and contacts the sealing ring to seal the opening of the cavity.

5. A battery cell baking device according to claim 4, characterized in that: The battery core baking device also includes a base, and the connecting frame is installed on the base.

6. The battery cell baking device according to claim 5, characterized in that: The connecting frame and the base are made of stainless steel or aluminum alloy.

7. The battery cell baking device according to claim 1, characterized in that: The single baking unit further comprises a vent hole, and the vent hole can be selectively connected to the high-temperature gas pipeline or the vacuum pipeline.

8. The battery cell baking device according to claim 7, characterized in that: The single baking unit further comprises a ventilation duct, which is respectively connected to the ventilation hole, the high-temperature gas duct and the vacuum duct.

9. The battery cell baking device according to claim 1, characterized in that: The vacuum pipeline is provided with a vacuum pipeline control valve, and the high-temperature gas pipeline is provided with a gas pipeline control valve.

10. The battery cell baking device according to claim 1, characterized in that: It also includes a heating device, which is provided with an air inlet and is connected to the high-temperature gas pipeline.

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