Battery baking device and use method thereof

Abstract

The invention discloses a battery baking device and a using method thereof, and relates to the technical field of battery production, the battery baking device comprises a rack, a baking oven, a vacuum pump and a control module, the baking oven is erected on the rack, the vacuum pump is fixed on the rack through a fixing plate and is communicated with the baking oven, and the control module is electrically connected with the baking oven and the vacuum pump; the drying oven is composed of an oven body, a temperature control assembly, a supporting assembly and a drying frame assembly, the temperature control assembly is arranged on the inner wall of the oven body, the supporting assembly is fixed to the inner bottom of the oven body, the drying frame assembly is erected on the supporting assembly, and the whole drying oven is of a spliced structure. Layered lap joint of different heights can be achieved, each layer can be further divided into areas of different sizes, the temperature control assembly is controlled by the control module, layered temperature control can be achieved, the drying quality is guaranteed, meanwhile, heat waste is reduced, and the cooling time is saved.

Description

Technical Field

[0001] The invention relates to the technical field of battery production, and in particular to a battery baking device and a use method thereof. Background Art

[0002] Lithium-ion batteries are favored by researchers and governments in various countries because of their advantages such as high energy density, high specific power, good cycle performance, no memory effect, and no pollution, as well as good economic benefits, social benefits and strategic significance.

[0003] In the production process of lithium-ion batteries and in the laboratory research on battery performance, many steps require baking, such as pole piece baking, battery cell baking, positive electrode active material, conductive agent, binder baking, etc. Generally, an oven is used for drying, and the quality of drying affects the capacity and life of the battery. Among them, the vacuum oven, also known as the vacuum drying oven, is a box-type drying equipment that dries the dry material under negative pressure conditions. Its working principle is to use a vacuum pump to extract air and moisture, so that a vacuum state is formed in the working room, which reduces the boiling point of water and speeds up the drying process.

[0004] The existing vacuum oven can automatically run after setting the heating temperature and time. For efficiency, the oven will put multiple groups of batteries into the drying area in layers at a time. As the water on the battery evaporates, the water vapor will be concentrated in the upper area, which also makes the battery group in the lower layer be dried first. At the same time, in order to prevent the dried battery from contacting the outside world and re-adhering to the water vapor, it is required to be completely cooled before being taken out. If all heating tubes maintain the same power during the drying process, it will not only cause heat waste, but also prolong the cooling time. Furthermore, in order to ensure the drying effect of each battery, the batteries cannot be stacked when placed, and the contact surface with the air should be ensured as much as possible to ensure complete drying. The general drying rack is either a single platform or is provided with a placement slot for uniform specifications. The applicability is low and the contact area of ​​the battery is restricted. At the same time, in the laboratory, it is often necessary to dry batteries of different specifications. If they are all placed on one drying rack, subsequent sorting will also take time. Summary of the invention

[0005] The object of the present invention is to provide a battery baking device and a method of using the same to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a battery baking device and a method of using the same, comprising a frame, an oven, a vacuum pump and a control module, wherein the oven is mounted on the frame, the vacuum pump is fixed to the frame through a fixing plate and is connected to the oven, and the control module is electrically connected to the oven and the vacuum pump; the oven consists of a box body, a temperature control component, a support component and a drying rack component, wherein the temperature control component is arranged on the inner wall of the box body, the support component is fixed to the bottom of the box body, the drying rack component is mounted on the support component, and the overall structure is a splicing structure, which can be layered and overlapped at different heights and each layer can be further divided into areas of different sizes, the temperature control component is controlled by the control module, and the temperature can be controlled in layers, while ensuring the drying quality, reducing heat waste and saving cooling time.

[0007] Furthermore, the drying rack assembly includes several drying racks, four fixed screws, a dividing bar group and fixing parts, wherein the fixed screws are passed through the four corners of the drying racks, and the drying racks can slide along the fixed screws. After adjusting the height of each drying rack, the drying rack is fixed to the fixed screws by the fixing parts. The fixing parts can be fixed threads or clamps. The dividing bar group cooperates with the drying rack to divide the surface into grids to divide the suitable drying range according to the needs.

[0008] Furthermore, the drying rack is composed of a placement layer and partition frames symmetrically arranged on the upper and lower sides of the placement layer, wherein the placement layer is suitable for placing batteries to be dried, and a plurality of through holes are arranged on the surface, which are suitable for reducing the overall mass and increasing the internal air circulation passage to assist in moisture drying. The partition frames are suitable for preventing batteries from falling out, and two rows of adjustment teeth cooperating with the partition bar group are arranged on all four sides.

[0009] Furthermore, the dividing grille group includes general dividing bars, adjustment bars and dividing rods, wherein the general dividing bars are rectangular bars, and the cross-sectional size can match the adjustment teeth, and the adjustment bars are provided with adjustment holes arranged at intervals on the basis of the general dividing bars, and the dividing rods are inserted into each adjustment hole.

[0010] Furthermore, the box body is composed of a shell, a box door and a plurality of groups of locking handles, wherein the box door is hinged at the front end opening of the shell, and the locking handles are arranged around the box door and are suitable for locking the box door.

[0011] Furthermore, the temperature control component is composed of a heat insulation screen, four lamp tube mounting strips and an array of heating lamp tubes, wherein the heat insulation screen is arranged inside the shell and is separated from the inner wall of the shell by a distance, the lamp tube mounting strips are symmetrically fixed on both sides of the heat insulation screen, and the heating lamp tubes are arranged on the lamp tube mounting strips at intervals.

[0012] Furthermore, the support assembly includes several support columns and load-bearing bars, wherein one end of the support column is fixed to the bottom of the shell, and the other end passes through the heat insulation screen and is fixed with a load-bearing bar, and the upper side of the load-bearing bar is suitable for setting up the drying rack assembly.

[0013] Furthermore, the vacuum pump is composed of a molecular pump body, an air valve and a connecting pipe, wherein the air valve is connected to the molecular pump body and the connecting pipe respectively, and the connecting pipe is connected to the interior of the shell.

[0014] The specific method is as follows: S1. Place the drying objects: overlap the drying rack components according to actual needs, assemble the partition bar group, and place the objects to be dried in the compartments surrounded by the partition bar group in sequence; S2. Sealing: Close the door, tighten the locking handle, and seal the outlet; S3, vacuuming: the control module starts the vacuum pump, draws the vacuum inside the box to the specified vacuum degree and then shuts it down; S4, heating: the control module starts each heating lamp, preheating at 80 degrees for 1 hour, baking at 100 degrees for 2 hours, and finally baking at 110 degrees for 4 hours; S5. Secondary vacuuming: During the heating process, the vacuum degree in the box is monitored at all times. If it drops to a certain set value at any time, the vacuum pump is restarted to pump to the specified vacuum degree again; S6, transition: before the drying is finished, the heating power of the heating lamps at different heights is appropriately adjusted, that is, the heating temperature is changed; S7, cooling: the control module turns off the heating lamp and leaves it alone for several hours; S8. Take out: When the inside of the box cools down to a suitable temperature, take out the dried items.

[0015] Specifically, the vacuum setting in S3 is as follows: The vacuum value indicates that the actual value of the system pressure is lower than the atmospheric pressure, which can be measured by a vacuum gauge, that is, vacuum = atmospheric pressure - absolute pressure, absolute pressure = atmospheric pressure + gauge pressure (- vacuum). Different regions have different vacuum settings due to different local atmospheric pressures. For example, there is a red scale on the vacuum gauge at -0.085, but Zhengzhou is often vacuumed to -0.1 in the north and south. The vacuum value of reduced pressure drying cannot exceed the -0.1 mark, otherwise the gauge will be broken, and if it exceeds the red line for a long time, it will affect the service life.

[0016] The heating process in S5 will decrease as the water vapor evaporates. Assuming that the set vacuum degree is A (MPa), the vacuum degree in the box 4 detected by the vacuum gauge is B (MPa). -0.1, a second vacuum is required.

[0017] The transition process in S6 is as follows: the heating lamps are divided into three groups according to their height: high, medium and low. One hour before the end of baking, the control module lowers the heating power of the heating lamps in the lower layer to 80 degrees; half an hour before the end of baking, the control module lowers the heating power of the heating lamps in the lower layer to 40 degrees, and lowers the heating power of the heating lamps in the middle layer to 80 degrees; after the baking is completed, all the heating lamps are turned off. The cooling transition is performed one hour before the end of baking. First, after the water vapor evaporates and rises, it is mostly concentrated at the top. The bottom can be cooled appropriately, and then the middle layer can be cooled. To ensure the quality of drying, the heating lamps on the top layer must be maintained at the specified drying temperature. This reduces energy loss. At the same time, because the cooling transition is performed first, the subsequent cooling time is relatively reduced, saving operation time.

[0018] Compared with the prior art, the beneficial effects achieved by the present invention are: by providing an adjustable drying rack assembly, it is suitable for drying batteries of various specifications at one time, especially for laboratory drying samples, by splicing the partition bar group, the drying ranges of different sizes can be freely divided, and the flexibility is strong; by providing a temperature control component and a control module, the heating power of the heating lamps at different heights is gradually reduced before the end of the drying time, thereby ensuring the drying quality while reducing energy loss and shortening the cooling time. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a partial schematic diagram of the present invention; Figure 3 is a cross-sectional view of the present invention; Figure 4 is a schematic diagram of a drying rack assembly of the present invention; Figure 5 is a schematic diagram of a separator bar of the present invention; Figure 6 It is a schematic diagram of the regulating strip and the separating stick of the present invention; In the figure: 1. frame; 2. vacuum pump; 21. molecular pump body; 22. air valve; 23. connecting pipe; 3. fixing plate; 4. box body; 41. shell; 42. box door; 43. locking handle; 5. temperature control assembly; 51. heat insulation screen; 52. lamp tube mounting strip; 53. heating lamp tube; 6. support assembly; 61. support column; 62. load-bearing strip; 7. drying rack assembly; 71. drying rack; 711. placement layer; 7111. through hole; 712. partition rack; 7121. adjustment tooth; 72. fixing screw; 73. partition grille group; 731. general partition strip; 732. adjustment strip; 7321. adjustment hole; 733. partition stick. DETAILED DESCRIPTION

[0020] The following is a further non-limiting detailed description of the technical solution of the present invention in conjunction with the preferred embodiments and the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] As shown in the figure, the present invention provides a technical solution: a battery baking device and a method of using the same, comprising a frame 1, an oven, a vacuum pump 2 and a control module, wherein the oven is mounted on the frame 1, the vacuum pump 2 is fixed to the frame 1 through a fixing plate 3 and is connected to the oven, and the control module is electrically connected to the oven and the vacuum pump 2; the oven consists of a box body 4, a temperature control component 5, a support component 6 and a drying rack component 7, wherein the temperature control component 5 is arranged on the inner wall of the box body 4, the support component 6 is fixed to the bottom of the box body 4, the drying rack component 7 is mounted on the support component 6, and the overall structure is a splicing structure, which can be layered and overlapped at different heights and each layer can be further divided into areas of different sizes, the temperature control component 5 is controlled by the control module, and the temperature can be controlled in layers, while ensuring the drying quality, reducing heat waste and saving cooling time.

[0022] The drying rack assembly 7 includes several drying racks 71, four fixed screws 72, a partition bar group 73 and a fixing part, wherein the fixed screws 72 are passed through the four corners of the drying rack 71, and the drying rack 71 can slide along the fixed screws 72. After adjusting the height of each drying rack 71, the drying rack 71 is fixed to the fixed screw 72 by the fixing part. The fixing part can be a fixed thread or a clamp. The partition bar group 73 cooperates with the drying rack 71 to divide the surface into grids to divide the suitable drying range according to the needs.

[0023] The drying rack 71 is composed of a placement layer 711 and a partition frame 712 symmetrically arranged on the upper and lower sides of the placement layer 711, wherein the placement layer 711 is suitable for placing batteries to be dried, and a plurality of through holes 7111 are arranged on the surface, which are suitable for reducing the overall mass and increasing the internal air circulation path to assist in drying the moisture, and the partition frame 712 is suitable for preventing the batteries from falling out, and two rows of adjustment teeth 7121 are arranged on all four sides to cooperate with the partition grid group 73. It should be supplemented that the symmetrical arrangement of the drying rack 71 allows both the upper and lower surfaces to be used as sample placement surfaces to avoid errors in the overlapping process that require re-joining.

[0024] The dividing bar group 73 includes a general dividing bar 731, an adjustment bar 732 and a dividing rod 733, wherein the general dividing bar 731 is a rectangular bar, and the cross-sectional size can match the adjustment tooth 7121, and the adjustment bar 732 is provided with adjustment holes 7321 arranged at intervals on the basis of the general dividing bar 731, and the dividing rod 733 is inserted into each adjustment hole 7321.

[0025] In actual operation, the general dividing strips 731 can be inserted on the appropriate adjusting teeth 7121 according to the size of the batteries to be dried. For example, if the batteries are placed horizontally and filled in a row, the highest height that their upper surfaces can reach is not enough for the upper adjusting teeth 7121, then the general dividing strips 731 are inserted on the lower adjusting teeth 7121; if larger batteries are placed next to a row of small batteries, two rows of general dividing strips 731 can be inserted on both sides for separation; the adjusting strips 732 and the dividing sticks 733 are more for laboratory needs. When there are many battery samples that need to be dried at one time, the adjusting strips 732 and the dividing sticks 733 can be used to divide the placement layer 711 into smaller areas, which is more flexible to use.

[0026] The box body 4 is composed of a shell 41 , a box door 42 and a plurality of locking handles 43 , wherein the box door 42 is hinged at the front end opening of the shell 41 , and the locking handles 43 are arranged around the box door 42 and are suitable for locking the box door 42 .

[0027] The temperature control component 5 is composed of a heat insulation screen 51, four lamp mounting strips 52 and an array of heating lamps 53, wherein the heat insulation screen 51 is arranged inside the shell 41 and is separated from the inner wall of the shell 41 by a certain distance, the lamp mounting strips 52 are symmetrically fixed on both sides of the heat insulation screen 51, and the heating lamps 53 are arranged on the lamp mounting strips 52 at intervals.

[0028] The support assembly 6 includes several support columns 61 and load-bearing bars 62 , wherein one end of the support column 61 is fixed to the bottom of the shell 41 , and the other end passes through the heat insulation screen 51 and is fixed with the load-bearing bar 62 . The upper side of the load-bearing bar 62 is suitable for mounting the drying rack assembly 7 .

[0029] The vacuum pump 2 is composed of a molecular pump body 21 , an air valve 22 and a connecting pipe 23 , wherein the air valve 22 is connected to the molecular pump body 21 and the connecting pipe 23 respectively, and the connecting pipe 23 is connected to the interior of the housing 41 .

[0030] The specific implementation methods are as follows: S1. Place the dried objects: overlap the drying rack assembly 7 according to actual needs, assemble the partition bar group 73, and place the objects to be dried in the compartments surrounded by the partition bar group 73 in sequence; S2, sealing: close the box door 42, tighten the locking handle 43, and seal the outlet; S3, vacuuming: the control module starts the vacuum pump 2, draws the vacuum inside the box 4 to a specified degree, and then shuts it down; S4, heating: the control module starts each heating lamp 53, preheating at 80 degrees for 1 hour, baking at 100 degrees for 2 hours, and finally baking at 110 degrees for 4 hours; S5, secondary vacuuming: During the heating process, the vacuum degree in the box 4 is monitored at all times. If it drops to a certain set value at any time, the vacuum pump 2 is restarted to evacuate to the specified vacuum degree again; S6, transition: before the drying is finished, the heating power of the heating lamps 53 at different heights is appropriately adjusted, that is, the heating temperature is changed; S7, cooling: the control module turns off the heating lamp 53 and leaves it alone for several hours; S8, taking out: when the inside of the box 4 is cooled to a suitable temperature, take out the dried objects.

[0031] Specifically, the vacuum setting in S3 is as follows: The vacuum value indicates that the actual value of the system pressure is lower than the atmospheric pressure, which can be measured by a vacuum gauge, that is, vacuum = atmospheric pressure - absolute pressure, absolute pressure = atmospheric pressure + gauge pressure (- vacuum). Different regions have different vacuum settings due to different local atmospheric pressures. For example, there is a red scale on the vacuum gauge at -0.085, but Zhengzhou is often vacuumed to -0.1 in the north and south. The vacuum value of reduced pressure drying cannot exceed the -0.1 mark, otherwise the gauge will be broken, and if it exceeds the red line for a long time, it will affect the service life.

[0032] The heating process in S5 will decrease as the water vapor evaporates. Assuming that the set vacuum degree is A (MPa), the vacuum degree in the box 4 detected by the vacuum gauge is B (MPa). -0.1, a second vacuum is required.

[0033] The transition process in S6 is as follows: the heating lamps 53 are divided into three groups according to their heights: high, medium and low. One hour before the end of baking, the control module adjusts the heating power of the heating lamps 53 in the lower layer to 80 degrees; half an hour before the end of baking, the control module adjusts the heating power of the heating lamps 53 in the lower layer to 40 degrees, and the heating power of the heating lamps 53 in the middle layer to 80 degrees; after the baking is completed, the heating lamps 53 are turned off. The cooling transition is performed one hour before the end of baking. First, after the water vapor evaporates and rises, it is mostly concentrated at the top. The bottom can be cooled appropriately, and then the middle layer can be cooled. To ensure the drying quality, the heating lamps 53 in the uppermost layer must be maintained at the specified drying temperature, which reduces energy loss. At the same time, because the cooling transition is performed in advance, the subsequent cooling time is relatively reduced, saving operation time.

[0034] In the description of the present invention, it is necessary to understand that the terms "up", "down", "front", "back", "left", "right", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0035] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features can be replaced by equivalents, and these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A battery baking device, characterized in that: include: A frame (1), an oven, a vacuum pump (2) and a control module, wherein the oven is mounted on the frame (1), the vacuum pump (2) is fixed to the frame (1) via a fixing plate (3) and is in communication with the oven, and the control module is electrically connected to the oven and the vacuum pump (2); the oven comprises a box body (4), a temperature control component (5), a support component (6) and a drying rack component (7), wherein the temperature control component (5) is arranged on the inner wall of the box body (4), the support component (6) is fixed to the inner bottom of the box body (4), and the drying rack component (7) is mounted on the support component (6). The whole structure is a spliced ​​structure, which can be overlapped in layers at different heights and each layer can be further divided into areas of different sizes. The temperature control component (5) is controlled by the control module and can control the temperature in layers, thereby reducing heat waste and saving cooling time while ensuring the drying quality.

2. A battery baking device according to claim 1, characterized in that: The drying rack assembly (7) comprises a plurality of drying racks (71), four fixing screws (72), a separation bar group (73) and a fixing member, wherein the fixing screws (72) are arranged at four corners of the drying racks (71), and the drying racks (71) can slide along the fixing screws (72). After the height of each drying rack (71) is adjusted, the drying racks (71) are fixed to the fixing screws (72) by the fixing member, and the fixing member is a fixing thread and a clamp. The separation bar group (73) cooperates with the drying rack (71) to divide the surface into grids so as to divide the drying range into suitable grids according to the requirements.

3. A battery baking device according to claim 2, characterized in that: The drying rack (71) is composed of a placement layer (711) and a partition frame (712) symmetrically arranged on the upper and lower sides of the placement layer (711), wherein the placement layer (711) is suitable for placing batteries to be dried, and a plurality of through holes (7111) are arranged on the surface thereof, which are suitable for reducing the overall mass and increasing the internal air circulation passage to assist in drying the moisture, and the partition frame (712) is suitable for preventing the batteries from falling out, and two rows of adjustment teeth (7121) are arranged on all four sides to cooperate with the partition grid bar group (73).

4. A battery baking device according to claim 3, characterized in that: The dividing grid bar group (73) comprises a general dividing bar (731), an adjustment bar (732) and a dividing stick (733), wherein the general dividing bar (731) is a rectangular bar, and the cross-sectional size can match the adjustment tooth (7121), and the adjustment bar (732) is provided with adjustment holes (7321) arranged at intervals on the basis of the general dividing bar (731), and the dividing stick (733) is inserted into each adjustment hole (7321).

5. A battery baking device according to claim 1, characterized in that: The box body (4) is composed of a shell (41), a box door (42) and a plurality of sets of locking handles (43), wherein the box door (42) is hinged at a front end opening of the shell (41), and the locking handles (43) are arranged around the box door (42) and are suitable for locking the box door (42).

6. A battery baking device according to claim 5, characterized in that: The temperature control component (5) is composed of a heat insulation screen (51), four lamp tube mounting strips (52), and an array of heating lamp tubes (53), wherein the heat insulation screen (51) is arranged inside the shell (41) and is separated from the inner wall of the shell (41) by a certain distance, the lamp tube mounting strips (52) are symmetrically fixed on both sides of the heat insulation screen (51), and the heating lamp tubes (53) are arranged on the lamp tube mounting strips (52) at intervals.

7. A battery baking device according to claim 5, characterized in that: The support assembly (6) comprises a plurality of support columns (61) and a load-bearing bar (62), wherein one end of the support column (61) is fixed to the bottom of the shell (41), and the other end passes through the heat insulation screen (51) and is fixed with a load-bearing bar (62), and the upper side of the load-bearing bar (62) is suitable for mounting a drying rack assembly (7).

8. A battery baking device according to claim 5, characterized in that: The vacuum pump (2) is composed of a molecular pump body (21), an air valve (22) and a connecting pipe (23), wherein the air valve (22) is connected to the molecular pump body (21) and the connecting pipe (23), respectively, and the connecting pipe (23) is connected to the interior of the housing (41).

9. A method for using a battery baking device, characterized in that: The specific method is as follows: S1, placing the drying objects: overlapping the drying rack components (7) according to actual needs, assembling the partition bar group (73), and placing the objects to be dried in the compartments surrounded by the partition bar group (73) in sequence; S2, sealing: close the box door (42), tighten the locking handle (43), and seal the outlet; S3, vacuuming: the control module starts the vacuum pump (2), draws the vacuum inside the box (4) to a specified vacuum degree, and then shuts down; S4, heating: the control module starts each heating lamp (53), preheating at 80 degrees for 1 hour, baking at 100 degrees for 2 hours, and finally baking at 110 degrees for 4 hours; S5, secondary vacuuming: during the heating process, the vacuum degree in the box (4) is constantly monitored. If it drops to a certain set value at any time, the vacuum pump (2) is restarted to evacuate to the specified vacuum degree again; S6, transition: before the drying is finished, the heating power of the heating lamps (53) at different heights is appropriately adjusted, that is, the heating temperature is changed; S7, cooling: the control module turns off the heating lamp (53) and leaves it to stand for several hours; S8, taking out: when the inside of the box (4) cools down to a suitable temperature, take out the dried object.

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