CN104913601A - Method for baking lithium ion battery or battery pole piece in tunnel mode - Google Patents
Method for baking lithium ion battery or battery pole piece in tunnel mode Download PDFInfo
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- CN104913601A CN104913601A CN201410832403.2A CN201410832403A CN104913601A CN 104913601 A CN104913601 A CN 104913601A CN 201410832403 A CN201410832403 A CN 201410832403A CN 104913601 A CN104913601 A CN 104913601A
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- preheating
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- 238000000034 method Methods 0.000 title claims abstract description 113
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 100
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 100
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 28
- 238000001816 cooling Methods 0.000 claims description 59
- 230000007704 transition Effects 0.000 claims description 49
- 239000002826 coolant Substances 0.000 claims description 16
- 238000010438 heat treatment Methods 0.000 claims description 16
- 239000002274 desiccant Substances 0.000 claims description 14
- 238000007599 discharging Methods 0.000 claims description 12
- 239000011229 interlayer Substances 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 6
- 238000005086 pumping Methods 0.000 claims description 6
- 238000004321 preservation Methods 0.000 claims description 5
- 230000000694 effects Effects 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 230000010349 pulsation Effects 0.000 abstract 1
- 239000007788 liquid Substances 0.000 description 5
- 230000000630 rising effect Effects 0.000 description 5
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 4
- 229910052744 lithium Inorganic materials 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 230000018044 dehydration Effects 0.000 description 3
- 238000006297 dehydration reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000012267 brine Substances 0.000 description 2
- 239000000292 calcium oxide Substances 0.000 description 2
- 235000012255 calcium oxide Nutrition 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 239000000741 silica gel Substances 0.000 description 2
- 229910002027 silica gel Inorganic materials 0.000 description 2
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 2
- 235000013547 stew Nutrition 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
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Abstract
A method for baking a lithium ion battery or a battery pole piece in a tunnel mode at least includes the step of pulsation vacuum preheating, wherein the temperature in a preheating box is made to rise to first preset temperature within first preset time, a part of water in the preheating box is drained through a vacuumizing method within second preset time, and the preheating box is refilled with dry air; the temperature in the preheating box is made to rise to second preset temperature within third preset time, a part of water in the preheating box is drained through the vacuumizing method within fourth preset time, and the preheating box is refilled with dry air; the step is circulated in this way until the temperature of the lithium ion battery or the battery pole piece in the preheating box reaches technological design temperature. Compared with the mode of single temperature rise in the preheating box in the prior art, most water in the lithium ion battery or the battery pole piece can be removed in the preheating stage, the water removal effect is excellent, and the water removal time of a speed bar production line can be greatly shortened.
Description
Technical Field
The invention relates to a method for tunnel-type baking of a lithium ion battery or a battery pole piece.
Background
The most common baking process is in a vacuum baking oven, baked lithium battery electrodes are firstly loaded into the vacuum baking oven, then the oven is heated, when the temperature in the oven meets the requirement, the oven is vacuumized to remove moisture in the oven under the condition of heat preservation, when the moisture of the battery electrode meets the requirement, the baked lithium battery electrodes or batteries in the oven are naturally or forcibly cooled, so that the baked lithium battery electrodes or batteries are taken out and sealed for storage after the temperature of the baked lithium battery electrodes or batteries is reduced to a certain degree (generally below 35 ℃). For example, chinese patent document CN104134777A discloses a method for tunnel-baking a lithium ion battery or a battery pole piece, which adopts a continuously working pulsating vacuum preheating step, a high vacuum segmented dehydration step and a rapid cooling step, so as to greatly shorten the baking time, and really realize the continuous operation of baking and coating lines of the lithium ion battery or the battery pole piece, but in practical application, the baking method is still to be further improved.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method for tunnel-type baking of lithium ion batteries or battery pole pieces, which can realize continuous operation with the front and back processes in the production process of battery pole pieces or the production process of batteries and has better baking effect.
The technical scheme of the invention is as follows: provides a method for tunnel baking lithium ion batteries or battery pole pieces, which at least comprises a pulsating vacuum preheating step or/and a high vacuum sectional dewatering step, wherein,
(1) a pulsating vacuum preheating step, namely raising the temperature in the preheating box body to a first preset temperature within first preset time, discharging part of moisture in the preheating box body by adopting a vacuumizing method within second preset time under the condition of continuously heating, and then filling dry gas back into the preheating box body to enable the pressure in the preheating box body to reach the initial pressure; raising the temperature in the preheating box body to a second preset temperature within third preset time, discharging part of moisture in the preheating box body by adopting a vacuumizing method within fourth preset time under the condition of continuously heating, and then filling dry gas back into the preheating box body to enable the pressure in the preheating box body to reach the initial pressure; the above steps are circulated until the temperature of the lithium ion battery or the battery pole piece in the preheating box body reaches the process design temperature; or/and
(2) and a high-vacuum segmented dewatering step, wherein in a heat-preservation state, the vacuum dewatering process is divided into more than three vacuum-pumping sections, from the first section, the absolute vacuum degree pumped by each section is sequentially increased, until the moisture of the lithium ion battery or the battery pole piece is reduced to first preset moisture.
As an improvement of the present invention, the present invention further includes,
(3) and a rapid cooling step, namely, inputting a cooling medium into the interlayer of the cooling box body, and arranging an internal circulation device in the cooling box body to uniformly diffuse the cold air on the inner wall of the interlayer in the cooling box body and reduce the temperature of the lithium ion battery or the battery pole piece to a second preset temperature.
As a further improvement of the invention, a concentration difference standing step is further arranged after the step (3), and in the concentration difference standing box body, moisture of the lithium ion battery or the battery pole piece is further removed by a concentration difference water removing method, so that the moisture of the lithium ion battery or the battery pole piece is reduced to second preset moisture.
As a further improvement of the invention, a transition step is further arranged between two required adjacent steps, and the transition box body corresponding to the transition step is used for adjusting the pressure in the transition box body to be basically equal to the pressure in the previous box body when the lithium ion battery or the battery pole piece from the previous box body needs to be received; and after the lithium ion battery or the battery pole piece is received, the pressure in the transition box body is adjusted to be basically equal to the pressure in the next box body, and the lithium ion battery or the battery pole piece is transmitted to the next box body.
As a further improvement of the present invention, before the step (1), when the pre-temperature transition box corresponding to the pre-temperature transition step is used for receiving the lithium ion battery or the battery pole piece from the previous process under normal pressure, the pressure in the pre-temperature transition box is substantially equal to the atmospheric pressure; after the lithium ion battery or the battery pole piece is received, the pressure in the preheating transition box body is adjusted to be basically equal to the pressure in the preheating box body, and the lithium ion battery or the battery pole piece is transmitted into the preheating box body.
As a further improvement of the invention, a preheating transition step is arranged before the step (1), and when a preheating transition box corresponding to the preheating transition step is used for receiving the lithium ion battery or the battery pole piece from the previous process under normal pressure, the pressure in the preheating transition box is basically equal to the atmospheric pressure; after the lithium ion battery or the battery pole piece is received, the pressure in the preheating transition box body is adjusted to be basically equal to the pressure in the preheating box body, and the lithium ion battery or the battery pole piece is transmitted into the preheating box body.
As a further improvement of the invention, the concentration difference water removal method is that at least a dryer and a circulating fan are arranged on the concentration difference standing box body, a drying agent is arranged in the dryer, and the circulating fan enables the gas in the concentration difference standing box body to continuously circulate through the drying agent.
As a further improvement of the invention, dry gas with the moisture content of less than 5ppm generated by the gas drying station is circularly input into the concentration standing box body.
As a further improvement of the invention, the concentration difference water removal method further comprises a deoxygenator arranged on the concentration difference standing box body, a deoxidizer is arranged in the deoxygenator, and the circulating fan enables gas in the concentration difference standing box body to continuously circulate through the deoxidizer.
As a further improvement of the present invention, the second predetermined temperature is between 20 degrees celsius and 60 degrees celsius.
Because the preheating box body is vacuumized at intervals of preset time in the preheating process, the moisture in the preheating box body is in a viscous flow state at the moment, a large amount of moisture can be easily discharged, and then dry gas is supplemented to the initial pressure, and then the preheating is carried out, the steps are repeated, and compared with the prior preheating box which is only simply heated, most of moisture in the lithium ion battery or the battery pole piece can be removed in the preheating stage, the dewatering effect is very good, and the dewatering time of a quick strip production line can be greatly shortened; in addition, the vacuum dewatering adopts a sectional dewatering method, so that the influence of the lithium ion battery or the battery pole piece which enters the vacuum dewatering water tank in the past on the moisture of the lithium ion battery or the battery pole piece can be effectively prevented; the cooling medium is introduced into the interlayer of the cooling box body, so that the problem that the moisture content in the dry gas affects the moisture of the lithium ion battery or the battery pole piece is solved by directly inputting the cooling dry gas into the cooling box body originally, and the cooling medium is introduced into the interlayer of the cooling box body, the components of the cooling medium can be unlimited, and the cooling medium can be gas or liquid.
Drawings
FIG. 1 is a schematic plan view of a first embodiment of the baking process of the present invention.
Fig. 2 is a schematic plan view of a second embodiment of the baking process of the present invention.
FIG. 3 is a schematic diagram of the pulsating vacuum preheating step of the present invention.
FIG. 4 is a schematic diagram of the high vacuum staged water removal step of the present invention.
Detailed Description
Referring to fig. 1, fig. 1 discloses a method for tunnel-type baking lithium ion batteries or battery pole pieces, which comprises a charging step 11, a pulsating vacuum preheating step 1, a high vacuum sectional dewatering step 2, a rapid cooling step 3, a concentration standing step 4, a discharging step 12 and the like, wherein the charging step 11, the pulsating vacuum preheating step 1, the high vacuum sectional dewatering step 2, the rapid cooling step 3, the concentration standing step 4 and the discharging step 12 work continuously, switchable doors are arranged at the front and the rear of corresponding working boxes and are connected in sequence to form a tunnel structure, each working box is independently sealed during working, when a processed lithium ion battery or battery pole piece enters the next working box from the previous working box, the door between the two adjacent outer boxes is opened under the condition that the pressures of the two adjacent boxes are kept consistent, the lithium ion battery or the battery pole piece is sent into the next working box body by the driving mechanism; when each working box body processes the lithium ion battery or the battery pole piece according to the process, the door between two adjacent outer box bodies is closed; wherein,
(11) placing a lithium ion battery or a battery pole piece on a working table top, and preparing to enter a pulsating vacuum preheating step;
(1) a pulsating vacuum preheating step, namely, raising the temperature in the preheating box body to a first preset temperature (which is determined according to a specific process and can be generally selected within 5-10 minutes) within a first preset time (which is determined according to the specific process and can be generally selected within 10-30 ℃ higher than the original temperature), discharging part of water in the preheating box body by adopting a vacuumizing method within a second preset time (which is determined according to the specific process and can be generally selected within 1-5 minutes) under the condition of continuously raising the temperature, and then, refilling dry gas (which is determined according to the specific process and can be generally selected within 1-3 minutes) into the preheating box body so that the pressure in the preheating box body reaches an initial pressure; then, the temperature in the preheating box body is increased to a second preset temperature (which is determined according to the specific process and can be generally selected within 5-10 minutes) within third preset time (which is determined according to the specific process and can be generally selected within 10-30 ℃ higher than the original temperature), partial moisture in the preheating box body is discharged by adopting a vacuumizing method within fourth preset time (which is determined according to the specific process and can be generally selected within 1-5 minutes) under the condition of continuously heating, and then, dry gas is filled back into the preheating box body (which is determined according to the specific process and can be generally selected within 1-3 minutes) so that the pressure in the preheating box body reaches the initial pressure; the above steps are circulated until the temperature of the lithium ion battery or the battery pole piece in the preheating box body reaches the process design temperature (the process design temperature is generally 75-250 ℃ depending on the specific process);
for example, if the total time of the whole pulsating vacuum preheating step of a certain process is 40 minutes, and the battery pole piece (only taking the battery pole piece as an example, the same applies hereinafter) is raised from 25 ℃ to 100 ℃, the temperature in the pre-heating box body (the initial temperature is set to 25 ℃) is raised to 50 ℃ by adopting a method of vacuumizing within a second predetermined time T123 minutes under the condition of continuously heating by adopting a first predetermined time T115 minutes (see fig. 3), and then, the drying gas is refilled into the pre-heating box body within a first air returning time T13 (2 minutes in the embodiment) so that the pressure in the pre-heating box body reaches the initial pressure; then, the temperature in the preheating box body is increased to a second preset temperature (75 ℃ in the embodiment) in a third preset time T21 (within 5 minutes, the third preset time may be the same as or different from the first preset time, and the same below), under the condition of continuing heating, partial moisture in the preheating box body is discharged by adopting a vacuumizing method in a fourth preset time T22 (3 minutes, the fourth preset time may be the same as or different from the second preset time, and the same below), and then, dry gas is filled back into the preheating box body (for 2 minutes) in a second air return time T23, so that the pressure in the preheating box body reaches the initial pressure; by so circulating, when n in the nth preset time Tn1, the nth +1 preset time Tn2 and the nth air return time Tn3 is equal to 4, the battery pole piece is lifted from 25 ℃ to 100 ℃ by using time of 40 minutes. Or/and
(2) and a high-vacuum segmented dewatering step, wherein in a heat-preservation state, the vacuum dewatering process is divided into more than three vacuum-pumping sections, from the first section, the absolute vacuum degree pumped by each section is sequentially increased, until the moisture of the lithium ion battery or the battery pole piece is reduced to first preset moisture.
For example, let the vacuum dewatering process be divided into ten vacuum segments, see fig. 4, Cn in fig. 4, where n = 10; then the first section C1 can be vacuumized to the absolute vacuum degree of 100 Pa plus or minus 20Pa, the battery pole piece is transferred to the second section C2 to be continuously vacuumized to the absolute vacuum degree of 80 Pa plus or minus 20Pa, and then transferred to the third section C3 to be continuously vacuumized to the absolute vacuum degree of 70 Pa plus or minus 10 Pa; then the vacuum pump is transferred to a fourth section (not shown in the figure) to continue pumping till the absolute vacuum degree reaches 60 Pa plus or minus 10 Pa; and so on until reaching the tenth section Cn, n =10 to meet the process design requirement.
The invention also comprises (3) a rapid cooling step, wherein a cooling medium is input into the interlayer of the cooling box body, and an internal circulation device is arranged in the cooling box body, so that the cold air on the inner wall of the interlayer is uniformly diffused in the cooling box body, and the temperature of the lithium ion battery or the battery pole piece is reduced to a second preset temperature. In the present invention, the cooling medium may be a liquid cooling medium such as water or brine; gaseous cooling media, such as cold air, etc., are also possible.
(4) And in the concentration difference standing box body, further removing the moisture of the lithium ion battery or the battery pole piece by a concentration difference dewatering method, so that the moisture of the lithium ion battery or the battery pole piece is reduced to second preset moisture. In this embodiment, the concentration difference dewatering method is that at least a dryer and a circulating fan are arranged on the concentration difference standing box body, a drying agent is arranged in the dryer, and the circulating fan enables gas in the concentration difference standing box body to continuously circulate through the drying agent. Or/and the concentration difference water removal method further comprises a deoxygenator arranged in the concentration difference standing box body, a deoxidizer is arranged in the deoxygenator, and the circulating fan enables gas in the concentration difference standing box body to continuously circulate through the deoxidizer.
(12) And discharging, wherein the lithium ion battery or the battery pole piece after concentration treatment is sent to the next procedure in a sealed state, the next procedure can be a slicing procedure for a coating line, and the next procedure can be a liquid injection procedure for the battery.
The above-mentioned step of cooling fast and the concentration is rested after cooling, the step of cooling fast and the concentration is rested still can be the cooling after the step of rested first, at the link processing high temperature state that stews like this, its dewatering effect is better, and it includes:
opening a door between the vacuum dewatering box body and the concentration difference standing box body (the pressure in the concentration difference standing box body needs to be adjusted to be basically equal to the pressure in the vacuum dewatering box body), and feeding the lithium ion battery or the battery pole piece in the vacuum dewatering box body into the concentration difference standing box body; further removing the moisture of the lithium ion battery or the battery pole piece by a concentration difference water removing method within the total time M times that the box body is preheated by the pulsating vacuum, wherein preferably M =1, 2 or 3, so that the moisture of the lithium ion battery or the battery pole piece is reduced to second preset moisture;
adjusting the pressure in the concentration difference standing box to normal pressure, opening a door between the concentration difference standing box and a cooling box, feeding the lithium ion battery or the battery pole piece in the concentration difference standing box into the cooling box, inputting a cooling medium into the cooling box, and reducing the temperature of the lithium ion battery or the battery pole piece to a second preset temperature within M times of the total time for preheating the box in a pulsating vacuum mode, wherein M =1, 2 or 3 is preferable.
In the invention, the rapid cooling and concentration standing steps can also be carried out as follows, namely, the cooling and standing dehydration are carried out simultaneously, and the method comprises the following steps:
opening a door between the vacuum dewatering box body and the concentration difference standing box body, and feeding the lithium ion battery or the battery pole piece in the vacuum dewatering box body into the concentration difference standing box body (the pressure in the concentration difference standing box body needs to be adjusted to be basically equal to the pressure in the vacuum dewatering box body); in M times of the total time for preheating the box body in the pulsating vacuum, wherein M =1, 2 or 3 is preferred, the moisture of the lithium ion battery or the battery pole piece is further removed by a concentration difference water removal method, so that the moisture of the lithium ion battery or the battery pole piece is reduced to second preset moisture; and simultaneously, cooling medium is input into the cooling box body, and the temperature of the lithium ion battery or the battery pole piece is reduced to a second preset temperature.
In the concentration difference dewatering method, at least a dryer and a circulating fan are arranged on a concentration difference standing box body, a drying agent is arranged in the dryer, and the circulating fan enables gas in the concentration difference standing box body to continuously circulate through the drying agent; or the dry gas with the water content lower than 5ppm generated by the gas drying station is circularly input into the concentration standing box body, the circulation is carried out in the concentration standing box body, and the water content in the lithium ion battery or the battery pole piece is further taken away by the dry gas with the water content lower than 5 ppm.
Preferably, the second predetermined temperature is between 25 degrees celsius and 60 degrees celsius.
Preferably, the second predetermined moisture is between 10ppm and 200 ppm.
In this embodiment, the drying agent may be quicklime or silica gel; the deoxidizer may be an iron powder deoxidizer or the like.
Referring to fig. 2, fig. 2 is a schematic plan block diagram of a second embodiment of the baking process of the present invention, the baking process includes a charging step 11, a preheating step 111, a pulsating vacuum preheating step 1, a vacuum transition step 31, a high vacuum sectional dewatering step 2, a cooling step 41, a rapid cooling step 3, a concentration standing step 4, a discharging step 12, etc. which work continuously, wherein the charging step 11, the preheating step 111, the pulsating vacuum preheating step 1, the vacuum transition step 31, the high vacuum sectional dewatering step 2, the cooling step 41, the rapid cooling step 3, the concentration standing step 4, and the discharging step 12 are provided with switchable gates at the front and the back of the corresponding working box and connected in sequence to form a tunnel structure, each working box is sealed independently during operation, when a lithium ion battery or a battery pole piece to be processed enters the next working box from the previous working box, under the condition of keeping the pressure of two adjacent boxes consistent, a door between two adjacent outer boxes is opened, and the lithium ion battery or the battery pole piece is conveyed into the next working box by a driving mechanism; when each working box body processes the lithium ion battery or the battery pole piece according to the process, the door between two adjacent outer box bodies is closed; wherein,
(11) placing the lithium ion battery or the battery pole piece on a working table top, and preparing to enter a temperature rise transition step;
(111) a temperature rising transition step, namely, charging the lithium ion battery or the battery pole piece into the temperature rising transition box body corresponding to the temperature rising transition step under normal pressure, closing the front door of the temperature rising transition box body, raising the pressure in the temperature rising transition box body to be basically equal to the pressure in the pulsating vacuum preheating box body by inputting protective gas, and preparing to transfer the lithium ion battery or the battery pole piece into the pulsating vacuum preheating box body;
(1) a pulsating vacuum preheating step, namely, raising the temperature in the preheating box body to a first preset temperature (which is determined according to a specific process and can be generally selected within 5-10 minutes) within a first preset time (which is determined according to the specific process and can be generally selected within 10-30 ℃ higher than the original temperature), discharging part of water in the preheating box body by adopting a vacuumizing method within a second preset time (which is determined according to the specific process and can be generally selected within 1-5 minutes) under the condition of continuously raising the temperature, and then, refilling dry gas (which is determined according to the specific process and can be generally selected within 1-3 minutes) into the preheating box body so that the pressure in the preheating box body reaches an initial pressure; then, the temperature in the preheating box body is increased to a second preset temperature (which is determined according to the specific process and can be generally selected within 5-10 minutes) within third preset time (which is determined according to the specific process and can be generally selected within 10-30 ℃ higher than the original temperature), partial moisture in the preheating box body is discharged by adopting a vacuumizing method within fourth preset time (which is determined according to the specific process and can be generally selected within 1-5 minutes) under the condition of continuously heating, and then, dry gas is filled back into the preheating box body (which is determined according to the specific process and can be generally selected within 1-3 minutes) so that the pressure in the preheating box body reaches the initial pressure; the above steps are circulated until the temperature of the lithium ion battery or the battery pole piece in the preheating box body reaches the process design temperature (the process design temperature is generally 75-250 ℃ depending on the specific process);
for example, if the total time of the whole pulsating vacuum preheating step of a certain process is 40 minutes, and the battery pole piece (only taking the battery pole piece as an example, the same applies hereinafter) is raised from 25 ℃ to 100 ℃, the temperature in the pre-heating box body (the initial temperature is set to 25 ℃) is raised to 50 ℃ by adopting a method of vacuumizing within a second predetermined time T123 minutes under the condition of continuously heating by adopting a first predetermined time T115 minutes (see fig. 3), and then, the drying gas is refilled into the pre-heating box body within a first air returning time T13 (2 minutes in the embodiment) so that the pressure in the pre-heating box body reaches the initial pressure; then, the temperature in the preheating box body is increased to a second preset temperature (75 ℃ in the embodiment) in a third preset time T21 (within 5 minutes, the third preset time may be the same as or different from the first preset time, and the same below), under the condition of continuing heating, partial moisture in the preheating box body is discharged by adopting a vacuumizing method in a fourth preset time T22 (3 minutes, the fourth preset time may be the same as or different from the second preset time, and the same below), and then, dry gas is filled back into the preheating box body (for 2 minutes) in a second air return time T23, so that the pressure in the preheating box body reaches the initial pressure; by so circulating, when n in the nth preset time Tn1, the nth +1 preset time Tn2 and the nth air return time Tn3 is equal to 4, the battery pole piece is lifted from 25 ℃ to 100 ℃ by using time of 40 minutes. Or/and
(21) a vacuum transition step, namely boosting the vacuum transition box body corresponding to the vacuum transition step to be basically equal to the pressure in the pulsating vacuum preheating box body, opening a door between the pulsating vacuum preheating box body and the vacuum transition box body, moving the lithium ion battery or the battery pole piece into the vacuum transition box body from the pulsating vacuum preheating box body, closing the door between the vacuum transition box body and the pulsating vacuum preheating box body, vacuumizing to be basically equal to the pressure in the vacuum dewatering box body, and preparing to move the lithium ion battery or the battery pole piece into the vacuum dewatering box body;
(2) and a high-vacuum segmented dewatering step, wherein in a heat-preservation state, the vacuum dewatering process is divided into more than three vacuum-pumping sections, from the first section, the absolute vacuum degree pumped by each section is sequentially increased, until the moisture of the lithium ion battery or the battery pole piece is reduced to first preset moisture.
For example, let the vacuum dewatering process be divided into ten vacuum segments, see fig. 4, Cn in fig. 4, where n = 10; then the first section C1 can be vacuumized to the absolute vacuum degree of 100 Pa plus or minus 20Pa, the battery pole piece is transferred to the second section C2 to be continuously vacuumized to the absolute vacuum degree of 80 Pa plus or minus 20Pa, and then transferred to the third section C3 to be continuously vacuumized to the absolute vacuum degree of 70 Pa plus or minus 10 Pa; then the vacuum pump is transferred to a fourth section (not shown in the figure) to continue pumping till the absolute vacuum degree reaches 60 Pa plus or minus 10 Pa; and so on until reaching the tenth section Cn, n =10 to meet the process design requirement.
(31) A cooling transition step, namely vacuumizing a cooling transition box body corresponding to the cooling transition step until the pressure in the vacuum dewatering box body is basically equal, opening a door between the vacuum dewatering box body and the cooling transition box body, moving the lithium ion battery or the battery pole piece into the cooling transition box body from the vacuum dewatering box body, closing the door between the cooling transition box body and the vacuum dewatering box body, raising the pressure in the cooling transition box body to normal pressure by using protective gas, and preparing to transfer the lithium ion battery or the battery pole piece into the cooling box body;
(3) and a rapid cooling step, namely, inputting a cooling medium into the interlayer of the cooling box body, and arranging an internal circulation device in the cooling box body to uniformly diffuse the cold air on the inner wall of the interlayer in the cooling box body and reduce the temperature of the lithium ion battery or the battery pole piece to a second preset temperature. In the present invention, the cooling medium may be a liquid cooling medium such as water or brine; gaseous cooling media, such as cold air, etc., are also possible.
(4) And opening a door between the cooling box body and the concentration difference standing box body, feeding the lithium ion battery or the battery pole piece in the cooling box body into the concentration difference standing box body, and further removing the moisture of the lithium ion battery or the battery pole piece in the concentration difference standing box body by a concentration difference dewatering method to reduce the moisture of the lithium ion battery or the battery pole piece to second preset moisture. In this embodiment, the concentration difference dewatering method is that at least a dryer and a circulating fan are arranged on the concentration difference standing box body, a drying agent is arranged in the dryer, and the circulating fan enables gas in the concentration difference standing box body to continuously circulate through the drying agent. Or/and the concentration difference water removal method further comprises a deoxygenator arranged in the concentration difference standing box body, a deoxidizer is arranged in the deoxygenator, and the circulating fan enables gas in the concentration difference standing box body to continuously circulate through the deoxidizer.
(12) And discharging, wherein the lithium ion battery or the battery pole piece after concentration treatment is sent to the next procedure in a sealed state, the next procedure can be a slicing procedure for a coating line, and the next procedure can be a liquid injection procedure for the battery.
The above-mentioned step of cooling fast and the concentration is rested after cooling, the step of cooling fast and the concentration is rested still can be the cooling after the step of rested first, at the link processing high temperature state that stews like this, its dewatering effect is better, and it includes:
opening a door between the vacuum dewatering box body and the concentration difference standing box body (the pressure in the concentration difference standing box body needs to be adjusted to be basically equal to the pressure in the vacuum dewatering box body), and feeding the lithium ion battery or the battery pole piece in the vacuum dewatering box body into the concentration difference standing box body; further removing the moisture of the lithium ion battery or the battery pole piece by a concentration difference water removing method within the total time M times that the box body is preheated by the pulsating vacuum, wherein preferably M =1, 2 or 3, so that the moisture of the lithium ion battery or the battery pole piece is reduced to second preset moisture;
adjusting the pressure in the concentration difference standing box to normal pressure, opening a door between the concentration difference standing box and a cooling box, feeding the lithium ion battery or the battery pole piece in the concentration difference standing box into the cooling box, inputting a cooling medium into the cooling box, and reducing the temperature of the lithium ion battery or the battery pole piece to a second preset temperature within M times of the total time for preheating the box in a pulsating vacuum mode, wherein M =1, 2 or 3 is preferable.
In the invention, the rapid cooling and concentration standing steps can also be carried out as follows, namely, the cooling and standing dehydration are carried out simultaneously, and the method comprises the following steps:
opening a door between the vacuum dewatering box body and the concentration difference standing box body, and feeding the lithium ion battery or the battery pole piece in the vacuum dewatering box body into the concentration difference standing box body (the pressure in the concentration difference standing box body needs to be adjusted to be basically equal to the pressure in the vacuum dewatering box body); in M times of the total time for preheating the box body in the pulsating vacuum, wherein M =1, 2 or 3 is preferred, the moisture of the lithium ion battery or the battery pole piece is further removed by a concentration difference water removal method, so that the moisture of the lithium ion battery or the battery pole piece is reduced to second preset moisture; and simultaneously, cooling medium is input into the cooling box body, and the temperature of the lithium ion battery or the battery pole piece is reduced to a second preset temperature.
In the concentration difference dewatering method, at least a dryer and a circulating fan are arranged on a concentration difference standing box body, a drying agent is arranged in the dryer, and the circulating fan enables gas in the concentration difference standing box body to continuously circulate through the drying agent; or the dry gas with the water content lower than 5ppm generated by the gas drying station is circularly input into the concentration standing box body, the circulation is carried out in the concentration standing box body, and the water content in the lithium ion battery or the battery pole piece is further taken away by the dry gas with the water content lower than 5 ppm.
Preferably, the second predetermined temperature is between 25 degrees celsius and 60 degrees celsius.
Preferably, the second predetermined moisture is between 10ppm and 200 ppm.
In this embodiment, the drying agent may be quicklime or silica gel; the deoxidizer may be an iron powder deoxidizer or the like.
Claims (10)
1. A method for tunnel-type baking of lithium ion batteries or battery pole pieces is characterized in that: at least comprises a pulse vacuum preheating step or/and a high vacuum sectional water removal step, wherein,
(1) a pulsating vacuum preheating step, namely raising the temperature in the preheating box body to a first preset temperature within first preset time, discharging part of moisture in the preheating box body by adopting a vacuumizing method within second preset time under the condition of continuously heating, and then filling dry gas back into the preheating box body to enable the pressure in the preheating box body to reach the initial pressure; raising the temperature in the preheating box body to a second preset temperature within third preset time, discharging part of moisture in the preheating box body by adopting a vacuumizing method within fourth preset time under the condition of continuously heating, and then filling dry gas back into the preheating box body to enable the pressure in the preheating box body to reach the initial pressure; the above steps are circulated until the temperature of the lithium ion battery or the battery pole piece in the preheating box body reaches the process design temperature; or/and
(2) and a high-vacuum segmented dewatering step, wherein in a heat-preservation state, the vacuum dewatering process is divided into more than three vacuum-pumping sections, from the first section, the absolute vacuum degree pumped by each section is sequentially increased, until the moisture of the lithium ion battery or the battery pole piece is reduced to first preset moisture.
2. The method of tunnel baking lithium ion batteries or battery pole pieces of claim 1, wherein: also comprises the following steps of (1) preparing,
(3) and a rapid cooling step, namely, inputting a cooling medium into the interlayer of the cooling box body, and arranging an internal circulation device in the cooling box body to uniformly diffuse the cold air on the inner wall of the interlayer in the cooling box body and reduce the temperature of the lithium ion battery or the battery pole piece to a second preset temperature.
3. The method for tunnel baking lithium ion batteries or battery pole pieces according to claim 1 or 2, characterized in that: and (3) a concentration difference standing step is further arranged after the step (3), and in the concentration difference standing box body, moisture of the lithium ion battery or the battery pole piece is further removed through a concentration difference water removing method, so that the moisture of the lithium ion battery or the battery pole piece is reduced to second preset moisture.
4. The method for tunnel baking lithium ion batteries or battery pole pieces according to claim 1, 2 or 3, characterized in that: a transition step is also arranged between the two required adjacent steps, and the transition box body corresponding to the transition step is used for adjusting the pressure in the transition box body to be basically equal to the pressure in the previous box body when the lithium ion battery or the battery pole piece from the previous box body needs to be received; and after the lithium ion battery or the battery pole piece is received, the pressure in the transition box body is adjusted to be basically equal to the pressure in the next box body, and the lithium ion battery or the battery pole piece is transmitted to the next box body.
5. The method of tunnel baking lithium ion batteries or battery pole pieces of claim 4, wherein: before the step (1), when the pre-temperature transition box body corresponding to the pre-temperature transition step is used for receiving the lithium ion battery or the battery pole piece from the previous procedure under normal pressure, the pressure in the pre-temperature transition box body is basically equal to the atmospheric pressure; after the lithium ion battery or the battery pole piece is received, the pressure in the preheating transition box body is adjusted to be basically equal to the pressure in the preheating box body, and the lithium ion battery or the battery pole piece is transmitted into the preheating box body.
6. The method for tunnel baking lithium ion batteries or battery pole pieces according to claim 1, 2 or 3, characterized in that: a pre-temperature transition step is arranged before the step (1), and when a pre-temperature transition box body corresponding to the pre-temperature transition step is used for receiving the lithium ion battery or the battery pole piece from the previous procedure under normal pressure, the pressure in the pre-temperature transition box body is basically equal to the atmospheric pressure; after the lithium ion battery or the battery pole piece is received, the pressure in the preheating transition box body is adjusted to be basically equal to the pressure in the preheating box body, and the lithium ion battery or the battery pole piece is transmitted into the preheating box body.
7. The method of tunnel baking lithium ion batteries or battery pole pieces of claim 3, wherein: the concentration difference dewatering method is characterized in that at least a dryer and a circulating fan are arranged on a concentration difference standing box body, a drying agent is arranged in the dryer, and the circulating fan enables gas in the concentration difference standing box body to continuously circulate through the drying agent.
8. The method of tunnel baking lithium ion batteries or battery pole pieces of claim 3, wherein: and circularly inputting the dry gas with the moisture content of less than 5ppm generated by the gas drying station into the concentration standing box body.
9. The method of tunnel baking lithium ion batteries or battery pole pieces of claim 3, wherein: the concentration difference dewatering method further comprises a deoxygenator arranged on the concentration difference standing box body, a deoxidizer is arranged in the deoxygenator, and the circulating fan enables gas in the concentration difference standing box body to continuously circulate through the deoxidizer.
10. The method for tunnel baking lithium ion batteries or battery pole pieces according to claim 1, 2 or 3, characterized in that: the second predetermined temperature is between 20 degrees celsius and 60 degrees celsius.
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| CN106288665A (en) * | 2016-08-19 | 2017-01-04 | 东莞市超业精密设备有限公司 | A vacuum drying process |
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| CN113433986A (en) * | 2021-06-30 | 2021-09-24 | 广东利元亨智能装备股份有限公司 | Temperature control method, oven, electronic device and readable storage medium |
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| CN115839603A (en) * | 2021-11-13 | 2023-03-24 | 宁德时代新能源科技股份有限公司 | Battery cell baking device, control system thereof and battery cell baking process |
| CN114740925A (en) * | 2022-04-20 | 2022-07-12 | 中国电子科技集团公司第三十八研究所 | Off-line control method for water vapor in electronic device |
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| CN114777427A (en) * | 2022-05-10 | 2022-07-22 | 星恒电源股份有限公司 | Drying method of square laminated lithium ion battery cell |
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