Baking device and processing method of high-specific-energy lithium ion battery

Abstract

The invention relates to the field of lithium ion battery processing, in particular to a high-specific-energy lithium ion battery baking device and processing method.The high-specific-energy lithium ion battery baking device comprises a baking barrel, a door plate is rotationally connected to one side of the baking barrel, and partition plates are symmetrically installed on the inner wall of the baking barrel. Through the rotation of the sieve plate and the fan blades below, hot air can rise spirally, so that hot air flow is generated above lithium ion batteries, uniform heating of the lithium ion batteries is ensured, and the turbofan can accelerate the hot air input and output efficiency, so that water vapor can be quickly brought out after hot air baking is completed; the baking environment is guaranteed, circulating cooling is conducted through the circulating water pump, when the temperature is high, cooling water can be cooled in advance and conveyed into the cavity, so that the rapid cooling effect is achieved, and in this way, the baking quality of the lithium ion battery can be guaranteed on the premise that it is guaranteed that the lithium ion battery is evenly heated during baking; and the temperature in the baking barrel can be effectively controlled.

Description

Technical Field

[0001] The invention relates to the field of lithium ion battery processing, and in particular to a baking device and a processing method for a high specific energy lithium ion battery. Background Art

[0002] Lithium-ion battery is a secondary battery that mainly relies on the movement of lithium ions between the positive electrode and the negative electrode to work. During the charge and discharge process, Li+ is embedded and de-embedded between the two electrodes: during charging, Li+ is de-embedded from the positive electrode and embedded into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; during discharge, the opposite is true. In addition, during processing, lithium-ion batteries are generally baked to ensure the performance and quality of the battery. The lithium-ion battery baking device is mainly used to remove moisture from the battery or pole piece during the production process of lithium batteries to ensure the performance and quality of lithium batteries.

[0003] The Chinese invention patent application with the publication number CN114659341B, a control method for lithium-ion battery baking, includes the following steps: S1: determine the function of the pressure rise caused by the leakage of the baking equipment, that is, the leakage function of the baking equipment; S2: set multiple parameters of the vacuum baking process, and then place the battery in the baking equipment for vacuum baking, and obtain the function of the pressure rise caused by the evaporation of water in the battery during the vacuum baking process in real time according to the leakage function, that is, the water evaporation function; S3: determine whether the baking stop condition is reached according to the water evaporation function, and the baking ends when it is reached. Compared with the prior art, this method avoids the problem of inefficiency caused by not considering the leakage of the baking equipment and controlling the operation of each step by time in the prior art.

[0004] During use, the existing lithium-ion battery baking device bakes out the water in the lithium-ion battery, but water vapor is generated after the water evaporates. At this time, the water vapor cannot be discharged from the device in time, so that the internal water vapor content is high, which affects the baking effect of the device. In addition, the existing baking device conveys hot air into the device for drying. This drying method cannot ensure that the lithium-ion battery is heated evenly. When the internal temperature is high, the device needs to be stopped and then cooled in time. The temperature cannot be quickly controlled within a safe range, which easily causes the lithium-ion battery to be in a more dangerous situation.

[0005] Therefore, it is necessary to invent a baking device and processing method for a high specific energy lithium-ion battery to solve the above problems. Summary of the invention

[0006] The purpose of the present invention is to provide a baking device and a processing method for a high-energy-density lithium-ion battery. The hot air for baking is transported in a spiral upward shape, so that after the airflow passes through the lithium-ion battery, a hot air flow will be formed on the top to cover it, thereby ensuring that the lithium-ion battery is heated evenly. The hot air can be quickly transported and output through the rotation of the turbofan, and water vapor can be quickly taken out while ensuring the baking effect. The cooling water is cooled in advance and then injected into the cavity, so that the cooling effect can be controlled, thereby solving the problems in the prior art that the internal water vapor after hot air drying affects the baking environment, the lithium-ion battery is heated unevenly, and the temperature cannot be quickly controlled within a safe range when the temperature is high.

[0007] In order to achieve the above object, the present invention provides the following technical solution: a baking device for a high specific energy lithium-ion battery, comprising a baking barrel, one side of the baking barrel is rotatably connected to a door panel, partitions are symmetrically installed on the inner wall of the baking barrel, and two groups of partitions divide the baking barrel into three groups of spaces: upper, middle and lower;

[0008] The hot air circulation component is arranged in the upper and lower spaces of the baking barrel and is used to circulate the hot air for baking in the baking barrel;

[0009] The uniform baking component is arranged in the space in the middle of the baking barrel and is used for uniform baking of lithium-ion batteries;

[0010] The temperature control component is arranged in the space in the middle of the baking barrel and is used to control the baking temperature.

[0011] As a preferred embodiment of the present invention, the hot air circulation component includes a through groove, which is opened in two groups of partitions, and six groups are opened in a circular distribution. A fixing frame is installed at the edge of the through groove, and the fixing frames of the two groups of partitions are symmetrically arranged. An air collecting hood is installed on the side of the partition away from the fixing frame, and the air collecting hood completely covers the through groove, and a turbofan is rotatably connected between each group of the air collecting hood and the fixing frame.

[0012] As a preferred solution of the present invention, a pulley 1 is axially connected to one side of the turbofan, and the pulley 1 is arranged on the outside of the wind collecting cover. The partition is located on one side of the wind collecting cover and is rotatably connected to a pulley 2. A belt is fitted between the pulley 1 and the pulley 2, and a driving gear 1 is installed on one side of the pulley 2.

[0013] As a preferred solution of the present invention, a motor is installed below the baking barrel, an output shaft is installed at the output end of the motor, and the output shaft is connected through the partition below, a driving gear 2 is sleeved and fixed on the output shaft, and the driving gear 2 is meshed with each group of driving gear 1.

[0014] As a preferred embodiment of the present invention, a hot air delivery box is installed on one side of the baking barrel, and the hot air delivery box is connected to the groups of air collecting hood pipes below. A vacuum pump is installed on one side of the baking barrel, and the vacuum pump is connected to the groups of air collecting hood pipes above.

[0015] As a preferred solution of the present invention, the uniform baking component includes an annular slide rail, which is installed on the inner wall of the baking barrel and is located in the middle space of the baking barrel. A sieve plate is arranged in the annular slide rail, a positioning ring is fixedly sleeved on the outer side of the sieve plate, and the positioning ring is slidably connected to the annular slide rail.

[0016] As a preferred solution of the present invention, a connecting shaft is installed above the sieve plate, and the connecting shaft is fixedly connected to the driving gear 2 above, a bevel gear 1 is installed below the sieve plate, one side of the bevel gear 1 is meshedly connected with the bevel gear 2, and the bevel gear 2 is fixedly connected to the inner wall of the baking barrel, one side of the bevel gear 2 is meshedly connected with the bevel gear 3, the bevel gear 3 is fixedly connected to the top of the output shaft, the bevel gear 3 is axially connected to the fan blade below, and the fan blade is axially connected to the output shaft below.

[0017] As a preferred solution of the present invention, the temperature control component includes an annular frame, which is installed on the inner wall of the baking barrel and is located in the middle space of the baking barrel. A cavity is opened in the annular frame, and a circulating water pump is installed on the top of the baking barrel, and the circulating water pump is connected to the internal pipe of the cavity.

[0018] A baking method for a high specific energy lithium-ion battery comprises the baking device for a high specific energy lithium-ion battery as described above, and the specific processing steps are as follows:

[0019] S1: The lithium-ion battery is placed on the sieve plate, and the hot air delivery box is started to deliver the hot air. At the same time, the motor is started to rotate the turbofan, so that the hot air is quickly delivered to the bottom of the sieve plate. The fan blades rotate to make the hot air rise and generate eddy currents. At the same time, the sieve plate drives the lithium-ion battery, so that the lithium-ion battery can be evenly and effectively baked.

[0020] S2: The hot air after baking is sucked out through the work of the vacuum pump to ensure that the hot air quickly takes away the water vapor evaporated by baking of the lithium-ion battery;

[0021] S3: The water is transported in the cavity by a circulating water pump, so as to achieve the effect of controlling the baking temperature inside the baking barrel, and the temperature of the water transported to the cavity can be controlled according to the baking requirements.

[0022] In the above technical solution, compared with the prior art, the technical effects and advantages provided by the present invention are as follows:

[0023] Through the rotation of the sieve plate, the fan blades below can make the hot air rise in a spiral shape, so that a hot air flow is generated above the lithium-ion battery to ensure that the lithium-ion battery is heated evenly, and the turbofan can accelerate the efficiency of hot air input and output, so that the water vapor can be quickly taken out after the hot air baking is completed to ensure the baking environment, and the circulating cooling is carried out through the circulating water pump. When the temperature is high, the cooling water can be cooled in advance and transported to the cavity, thereby achieving a rapid cooling effect. In this way, the quality of baking can be guaranteed while ensuring that the lithium-ion battery is heated evenly, and the temperature in the baking barrel can be effectively controlled. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0025] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 It is a schematic diagram of the sliced ​​structure of the baking barrel of the present invention;

[0027] Figure 3 It is a schematic diagram of the sieve plate structure of the present invention;

[0028] Figure 4 It is a schematic diagram of the layout structure of the annular frame of the present invention;

[0029] Figure 5 It is a schematic diagram of the layout structure of the bevel gear 1 of the present invention;

[0030] Figure 6 For the present invention Figure 2 The enlarged structural diagram at A in the middle;

[0031] Figure 7 For the present invention Figure 3 The enlarged structural diagram at B in the middle;

[0032] Figure 8 For the present invention Figure 3 Enlarged structural diagram at point C in the middle.

[0033] Description of reference numerals:

[0034] 001, baking barrel; 101, door panel; 102, partition; 002, hot air circulation component; 201, through slot; 202, fixing frame; 203, wind collecting hood; 204, turbofan; 205, pulley one; 206, belt; 207, pulley two; 208, driving gear one; 209, motor; 210, output shaft; 211, driving gear two; 212, hot air delivery box; 213, vacuum pump; 003, uniform baking component; 301, annular slide rail; 302, sieve plate; 303, positioning ring; 304, connecting shaft; 305, bevel gear one; 306, bevel gear two; 307, bevel gear three; 308, fan blade; 004, temperature control component; 401, annular frame; 402, cavity; 403, circulating water pump. DETAILED DESCRIPTION

[0035] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0036] The present invention provides Figure 1-8 A high specific energy lithium-ion battery baking device shown includes a baking barrel 001, a door panel 101 is rotatably connected to one side of the baking barrel 001, partitions 102 are symmetrically installed on the inner wall of the baking barrel 001, and two groups of partitions 102 divide the baking barrel 001 into three groups of spaces, upper, middle and lower;

[0037] The hot air circulation component 002 is arranged in the upper and lower spaces of the baking barrel 001, and is used to circulate the hot air for baking in the baking barrel 001;

[0038] The uniform baking component 003 is arranged in the space in the middle of the baking barrel 001 and is used for uniform baking of lithium-ion batteries;

[0039] The temperature control component 004 is arranged in the space in the middle of the baking barrel 001 and is used to control the baking temperature.

[0040] Furthermore, in the above structure, the hot air circulation component 002 includes a through slot 201, which is opened in two groups of partitions 102, and six groups are opened in a ring-shaped distribution. A fixing frame 202 is installed at the edge of the through slot 201, and the fixing frames 202 of the two groups of partitions 102 are symmetrically arranged. An air collecting hood 203 is installed on the side of the partition 102 away from the fixing frame 202, and the air collecting hood 203 completely covers the through slot 201, and a turbofan 204 is rotatably connected between each group of air collecting hoods 203 and the fixing frame 202.

[0041] The rotation of the turbofan 204 allows the air to flow from the inside of the air collecting cover 203 to the outside, and flow toward the middle along the through slot 201 .

[0042] Furthermore, in the above structure, a pulley 205 is axially connected to one side of the turbofan 204, and the pulley 205 is arranged on the outside of the wind collecting cover 203. The partition 102 is located on one side of the wind collecting cover 203 and is rotatably connected to a pulley 207. A belt 206 is fitted between the pulley 205 and the pulley 207, and a driving gear 208 is installed on one side of the pulley 207.

[0043] The belt 206 can be used to make the pulley 207 drive the pulley 1 205 to rotate, thereby causing the turbofan 204 to rotate.

[0044] Furthermore, in the above structure, a motor 209 is installed below the baking barrel 001, an output shaft 210 is installed at the output end of the motor 209, and the output shaft 210 is connected through the partition 102 below, a driving gear 211 is sleeved and fixed on the output shaft 210, and the driving gear 211 is meshed with each group of driving gear 1 208.

[0045] The output shaft 210 is driven to rotate by the motor 209, so that the driving gear 2 211 drives each group of driving gear 1 208 to rotate simultaneously.

[0046] Furthermore, in the above structure, a hot air delivery box 212 is installed on one side of the baking barrel 001, and the hot air delivery box 212 is connected to the pipes of each group of air collecting hoods 203 below, and a vacuum pump 213 is installed on one side of the baking barrel 001, and the vacuum pump 213 is connected to the pipes of each group of air collecting hoods 203 above.

[0047] The hot air can be transported to the baking barrel 001 through the hot air delivery box 212 through the wind collecting hood 203 below, and the vacuum pump 213 can be used to allow the wind collecting hood 203 above to extract the hot air after drying, so that the water vapor can be quickly discharged to ensure a normal drying environment.

[0048] Furthermore, in the above structure, the uniform baking component 003 includes an annular slide rail 301, which is installed on the inner wall of the baking barrel 001, and the annular slide rail 301 is located in the middle space of the baking barrel 001. A sieve plate 302 is arranged in the annular slide rail 301, and a positioning ring 303 is fixedly sleeved on the outer side of the sieve plate 302, and the positioning ring 303 is slidably connected to the annular slide rail 301.

[0049] Through the cooperation between the positioning ring 303 and the annular slide rail 301 , the screen plate 302 can rotate stably.

[0050] Furthermore, in the above structure, a connecting shaft 304 is installed above the sieve plate 302, and the connecting shaft 304 is fixedly connected to the driving gear 2 211 above, and a bevel gear 1 305 is installed below the sieve plate 302, and one side of the bevel gear 1 305 is meshedly connected with the bevel gear 2 306, and the bevel gear 2 306 is fixedly connected to the inner wall of the baking barrel 001, and one side of the bevel gear 2 306 is meshedly connected with the bevel gear 3 307, and the bevel gear 3 307 is fixedly connected to the top of the output shaft 210, and the fan blade 308 is axially connected to the bottom of the bevel gear 307, and the fan blade 308 is axially connected to the output shaft 210 at the bottom.

[0051] The fan blades 308 can be driven to rotate through the output shaft 210, so that the hot air can spirally rise, and the bevel gear three 307 drives the bevel gear one 305 to rotate through the bevel gear two 306, so that the sieve plate 302 can rotate, so that the lithium-ion batteries above the sieve plate 302 can rotate during the drying process, so that the lithium-ion batteries can be evenly dried.

[0052] Furthermore, in the above structure, the temperature control component 004 includes an annular frame 401, which is installed on the inner wall of the baking barrel 001, and the annular frame 401 is located in the middle space of the baking barrel 001. A cavity 402 is opened in the annular frame 401, and a circulating water pump 403 is installed on the top of the baking barrel 001, and the circulating water pump 403 is connected to the internal pipeline of the cavity 402.

[0053] The cooling water can be delivered to the cavity 402 through the circulating water pump 403, so that the cooling water can take away the high temperature in the baking barrel 001, thereby achieving the effect of controlling the internal temperature of the baking barrel 001, and the temperature of the cooling water can be reduced externally in advance, thereby quickly reducing the temperature inside the baking barrel 001.

[0054] A baking method for a high specific energy lithium-ion battery comprises the above-mentioned baking device for a high specific energy lithium-ion battery, and the specific processing steps are as follows:

[0055] S1: The lithium-ion battery is placed on the sieve plate 302, and the hot air delivery box 212 is started to deliver the hot air. At the same time, the motor 209 is started to rotate the turbofan 204, so that the hot air is quickly delivered to the bottom of the sieve plate 302. The fan blades 308 rotate, so that the hot air rises and generates eddy currents. At the same time, the sieve plate 302 drives the lithium-ion battery, so that the lithium-ion battery can be evenly and effectively baked.

[0056] S2: The hot air after baking is sucked out through the operation of the vacuum pump 213, so as to ensure that the hot air quickly takes away the water vapor evaporated by baking of the lithium-ion battery;

[0057] S3: The water is transported in the cavity 402 by the circulating water pump 403, so as to achieve the effect of controlling the baking temperature inside the baking barrel 001, and the temperature of the water transported to the cavity 402 can be controlled according to the baking requirements.

[0058] like Figure 1-8 As shown, by placing the lithium-ion battery above the sieve plate 302, the hot air delivery box 212, the vacuum pump 213 and the motor 209 are turned on, so that the motor 209 drives the output shaft 210 to rotate, thereby rotating the turbofan 204 and the fan blades 308, so that the hot air can be in a spiral upward state, thereby drying the lithium-ion battery above the sieve plate 302. Since the hot air is in a spiral shape and the sieve plate 302 rotates in the opposite direction, the hot air can flow above the lithium-ion battery, thereby drying the lithium-ion battery in all directions. The drying can ensure that the lithium-ion battery is heated evenly in all directions. At the same time, the vacuum pump 213 can discharge the hot air containing water vapor into the baking barrel 001 along the wind collecting hood 203 above, and the cooling water can be transported to the cavity 402 through the circulating water pump 403. The cooling water absorbs the temperature in the baking barrel 001 through the inner wall of the cavity 402 and transports it out, thereby controlling the internal temperature of the baking barrel 001. In this way, the baking environment of the lithium-ion battery can be guaranteed, thereby improving the production quality of the lithium-ion battery.

[0059] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A baking device for high specific energy lithium-ion batteries, comprising a baking barrel (001), characterized in that: A door panel (101) is rotatably connected to one side of the baking barrel (001), and partitions (102) are symmetrically installed on the inner wall of the baking barrel (001), and two groups of partitions (102) divide the baking barrel (001) into three groups of spaces, namely, upper, middle and lower. A hot air circulation component (002) is arranged in two groups of spaces above and below the baking barrel (001) and is used to circulate the hot air for baking in the baking barrel (001); A uniform baking component (003) is arranged in the middle space of the baking barrel (001) and is used for uniform baking of lithium-ion batteries; The temperature control component (004) is arranged in the space in the middle of the baking barrel (001) and is used to control the baking temperature.

2. The baking device for a high specific energy lithium-ion battery according to claim 1, characterized in that: The hot air circulation component (002) comprises a through slot (201), wherein the through slot (201) is provided in two groups of partitions (102), and six groups are provided in an annular distribution. A fixing frame (202) is installed at the edge of the through slot (201), and the fixing frames (202) of the two groups of partitions (102) are symmetrically arranged. A wind collecting hood (203) is installed on the side of the partition (102) away from the fixing frame (202), and the wind collecting hood (203) completely covers the through slot (201), and a turbofan (204) is rotatably connected between each group of the wind collecting hood (203) and the fixing frame (202).

3. The baking device for a high specific energy lithium-ion battery according to claim 2, characterized in that: One side of the turbofan (204) is axially connected to a pulley 1 (205), and the pulley 1 (205) is arranged on the outside of the wind collecting cover (203). The partition (102) is located on one side of the wind collecting cover (203) and is rotatably connected to a pulley 2 (207). A belt (206) is fitted between the pulley 1 (205) and the pulley 2 (207), and a driving gear 1 (208) is installed on one side of the pulley 2 (207).

4. The baking device for a high specific energy lithium-ion battery according to claim 1, characterized in that: A motor (209) is installed below the baking barrel (001), an output shaft (210) is installed at the output end of the motor (209), and the output shaft (210) is connected to the partition (102) below, a driving gear 2 (211) is sleeved and fixed on the output shaft (210), and the driving gear 2 (211) is meshed with each group of driving gear 1 (208).

5. The baking device for a high specific energy lithium-ion battery according to claim 4, characterized in that: A hot air delivery box (212) is installed on one side of the baking barrel (001), and the hot air delivery box (212) is connected to the pipes of each group of air collecting hoods (203) below. A vacuum pump (213) is installed on one side of the baking barrel (001), and the vacuum pump (213) is connected to the pipes of each group of air collecting hoods (203) above.

6. The baking device for a high specific energy lithium-ion battery according to claim 1, characterized in that: The uniform baking component (003) comprises an annular slide rail (301), the annular slide rail (301) is installed on the inner wall of the baking barrel (001), and the annular slide rail (301) is located in the middle space of the baking barrel (001), a sieve plate (302) is arranged in the annular slide rail (301), a positioning ring (303) is sleeved and fixed on the outer side of the sieve plate (302), and the positioning ring (303) is slidably connected to the annular slide rail (301).

7. The baking device for high specific energy lithium-ion batteries according to claim 6, characterized in that: A connecting shaft (304) is installed above the sieve plate (302), and the connecting shaft (304) is fixedly connected to the driving gear 2 (211) above. A bevel gear 1 (305) is installed below the sieve plate (302). One side of the bevel gear 1 (305) is meshedly connected to the bevel gear 2 (306), and the bevel gear 2 (306) is fixedly connected to the inner wall of the baking barrel (001). One side of the bevel gear 2 (306) is meshedly connected to the bevel gear 3 (307). The bevel gear 3 (307) is fixedly connected to the top of the output shaft (210). A fan blade (308) is axially connected to the bottom of the bevel gear 3 (307), and the fan blade (308) is axially connected to the output shaft (210) at the bottom.

8. The baking device for a high specific energy lithium-ion battery according to claim 1, characterized in that: The temperature control component (004) comprises an annular frame (401), wherein the annular frame (401) is mounted on the inner wall of the baking barrel (001), and the annular frame (401) is located in the middle space of the baking barrel (001), and a cavity (402) is opened in the annular frame (401), and a circulating water pump (403) is installed on the top of the baking barrel (001), and the circulating water pump (403) is connected to a pipeline inside the cavity (402).

9. A baking method for a high specific energy lithium-ion battery, comprising a baking device for a high specific energy lithium-ion battery as claimed in any one of claims 1 to 8, characterized in that: The processing steps are as follows: S1: The lithium-ion battery is placed on the sieve plate (302), and the hot air delivery box (212) is started to deliver the hot air. At the same time, the motor (209) is started to rotate the turbofan (204), so that the hot air is quickly delivered to the bottom of the sieve plate (302). The fan blades (308) rotate, so that the hot air rises and generates eddy currents. At the same time, the sieve plate (302) drives the lithium-ion battery, so that the lithium-ion battery can be evenly and effectively baked. S2: The hot air after baking is sucked out by the operation of the vacuum pump (213), so as to ensure that the hot air quickly takes away the water vapor evaporated by baking the lithium-ion battery; S3: The water is transported in the cavity (402) through the circulating water pump (403), thereby achieving the effect of controlling the baking temperature inside the baking barrel (001), and the temperature of the water transported to the cavity (402) can be controlled according to the baking requirements.

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