CN114659341A - Control method for baking lithium ion battery - Google Patents
Control method for baking lithium ion battery Download PDFInfo
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- CN114659341A CN114659341A CN202210199545.4A CN202210199545A CN114659341A CN 114659341 A CN114659341 A CN 114659341A CN 202210199545 A CN202210199545 A CN 202210199545A CN 114659341 A CN114659341 A CN 114659341A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B5/00—Drying solid materials or objects by processes not involving the application of heat
- F26B5/04—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum
- F26B5/042—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum for drying articles or discrete batches of material in a continuous or semi-continuous operation, e.g. with locks or other air tight arrangements for charging/discharging
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B23/00—Heating arrangements
- F26B23/04—Heating arrangements using electric heating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/001—Handling, e.g. loading or unloading arrangements
- F26B25/003—Handling, e.g. loading or unloading arrangements for articles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/06—Chambers, containers, or receptacles
- F26B25/14—Chambers, containers, receptacles of simple construction
- F26B25/18—Chambers, containers, receptacles of simple construction mainly open, e.g. dish, tray, pan, rack
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/22—Controlling the drying process in dependence on liquid content of solid materials or objects
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Manufacturing & Machinery (AREA)
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Abstract
The invention relates to a control method for baking a lithium ion battery, which comprises the following steps: s1: determining a function of pressure rise of the baking equipment caused by leakage, namely a leakage function of the baking equipment; s2: setting a plurality of parameters of the vacuum baking process, then placing the battery in baking equipment for vacuum baking, and acquiring a function of pressure rise of the battery due to water evaporation in the vacuum baking process, namely a water evaporation function, in real time according to the leakage function; s3: and judging whether the baking stopping condition is met or not according to the water evaporation function, and if so, finishing baking. Compared with the prior art, the method avoids the problem of low efficiency caused by the fact that the leakage of the baking equipment and the control of the operation of each process step through time are not considered in the prior art.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a control method for baking a lithium ion battery.
Background
In the manufacturing process of the lithium ion battery, the battery core needs to be subjected to vacuum baking dehydration operation, and the water content in the battery core is removed to a qualified range. The baking is mainly to evaporate water in the battery into water vapor, reduce the boiling point of the water in a manner of reducing the air pressure, and improve the evaporation efficiency of the water in a manner of heating. There are three main aspects affecting the efficiency of water evaporation: temperature, pressure and moisture content. Because of the limitation of the components of the lithium battery, the temperature has a certain upper limit, and the temperature cannot be increased continuously. Similarly, because of the limitations of environment, equipment and production efficiency, the pressure has a certain lower limit, and the infinite pursuit of low pressure can greatly reduce the production efficiency. Therefore, the baking efficiency is improved from the aspect of moisture content.
The existing baking method carries out corresponding control and action on baking equipment by setting time through a program, and the flow of the whole method sequentially comprises the following steps: starting baking, preheating the battery, baking in vacuum and finishing baking.
Wherein, the pressure change curve in the vacuum baking process is shown in fig. 1, and the vacuum baking conditions are set as follows: the lower limit is 100pa and the upper limit is 300 pa. Stopping vacuumizing when the vacuum is pumped to 100pa, keeping the baking in a vacuum state, opening a vacuum pipeline when the water is evaporated and the pressure is increased to 300pa, stopping vacuumizing when the pressure is pumped to 100pa, repeating the steps until the set vacuum baking time is reached, and pumping out after a certain amount of nitrogen is introduced for baking for a set time.
In the vacuum baking process, after the pressure reaches the set upper limit, the vacuum is pumped to the set lower limit and then the baking is continued, the proportion of the water content in the cavity of the baking equipment in the process is not reduced, so the water evaporation efficiency is influenced, in the baking process, the water content of the battery after being baked for a period of time is less than that of the battery after being just started for a period of time, and the vacuumizing of the baking equipment for the set time has certain waste and low efficiency.
The existing baking method also has the following problems:
(1) in the battery preheating process, general preheating time is 1 ~ 2 hours, and the preheating time overlength leads to production efficiency low to in the battery preheating process, the gas in the baking oven is heated the inflation, has increased the pressure in the cavity, has the speed to the evaporation of water to slow down the effect, leads to the efficiency reduction that lithium ion battery toasted.
(2) The existing baking method mainly controls the operation of each process step through time, and runs the next program action after the set time is reached. The action is controlled purely by program time, cannot be intelligently controlled according to the water content of the battery and the variation trend of the baking pressure, consumes time and cost, and has low efficiency.
(3) The existing baking method does not consider the leakage rate of equipment, consumes time and cost, has low efficiency and has poor product consistency.
Disclosure of Invention
The present invention is directed to overcoming the above-mentioned drawbacks of the prior art, and providing a control method for baking a lithium ion battery, which avoids the problem of inefficiency caused by the fact that no leakage of a baking device is considered and the operation of each process step is controlled by time in the prior art.
The purpose of the invention can be realized by the following technical scheme:
the invention provides a control method for baking a lithium ion battery, which comprises the following steps:
s1: determining a function of pressure rise of the baking equipment caused by leakage, namely a leakage function of the baking equipment;
s2: setting a plurality of control parameters of the vacuum baking process, placing the battery in baking equipment for vacuum baking, controlling the operation of each step in the vacuum baking process based on the control parameters, and simultaneously acquiring a function of pressure rise of the battery due to water evaporation in the vacuum baking process, namely a water evaporation function, in real time according to the leakage function;
s3: and judging whether the baking stopping condition is met or not according to the water evaporation function, and if so, finishing baking.
Preferably, the parameters include ultimate vacuum pressure, upper vacuum limit pressure, lower vacuum limit pressure, drying pressure, termination time, baking temperature, and upper evacuation time limit.
Preferably, the S1 is specifically:
for the baking equipment used for the first time, the baking equipment used for the first time is placed under the no-load condition, the cavity of the baking equipment is vacuumized to enable the air pressure in the cavity to reach the ultimate vacuum pressure, all valves and switches of the baking equipment are closed to enable the baking equipment to be kept in a sealed state, pressure data of all moments from the ultimate vacuum pressure to the vacuum degree upper limit pressure in the baking equipment in the sealed state are collected, all the pressure data are stored in a computer, and a leakage function is determined by the computer according to all the pressure data.
Preferably, the process of determining the leak function by the computer from all pressure data is embodied as:
collecting pressure data of all moments from ultimate vacuum pressure to vacuum degree upper limit pressure in the baking equipment in an unloaded and sealed state, and further acquiring an initial pressure rise function;
deriving the initial pressure rise function to obtain a pressure rise rate function at each moment;
and converting the pressure rise rate function into a function of the pressure rise rate changing along with the pressure by an inverse function, and integrating the function of the pressure rise rate changing along with the pressure to obtain a leakage function.
Preferably, the S2 is specifically:
placing the battery in baking equipment for vacuum baking, automatically introducing inert gas or dry gas into the cavity when the pressure in the cavity of the baking equipment rises to baking upper limit pressure in the vacuum baking process so that the gas pressure in the cavity reaches set pressure, uniformly mixing, extracting mixed gas until the pressure in the cavity falls to vacuum lower limit pressure, and continuing baking; when the pressure in the cavity rises to the baking upper limit pressure again, introducing inert gas or dry gas again, uniformly mixing, extracting mixed gas, and circularly working;
meanwhile, a function of pressure rise and time in the cavity in the vacuum baking process of the battery, namely a pressure rise function, is monitored and obtained in real time, and then a water evaporation function is obtained.
Preferably, in the process of extracting the mixed gas until the pressure in the cavity is reduced to the vacuum degree lower limit pressure, if the required time exceeds the upper limit of the vacuumizing time, the leakage amount of the baking equipment is too large, and the baking equipment is stopped.
Preferably, the calculation formula of the water evaporation function is as follows:
wherein g (t) is a water evaporation function, f (t) is a pressure rise function,
as a function of leakage.
Preferably, the S3 is specifically:
and the computer acquires the pressure generated by the battery baking water evaporation at the moment according to the water evaporation function, and stops baking if the pressure generated by the battery due to the water evaporation in the set time does not reach the baking upper limit pressure.
Preferably, before performing the S2, the gas in the cavity of the baking apparatus is replaced with gas.
Preferably, the gas replacement process is specifically:
the battery is placed in a baking device, the cavity is subjected to primary vacuumizing to enable the air pressure in the cavity to reach the upper limit pressure of vacuum degree, baking is conducted, inert gas or dry gas is introduced into the cavity to enable the pressure in the cavity to reach the dry pressure, secondary vacuumizing is conducted to enable the air pressure in the cavity to reach the lower limit pressure of vacuum degree, and gas replacement in the baking device is achieved.
Compared with the prior art, the invention has the following advantages:
1. according to the control method for baking the lithium ion battery, provided by the invention, the leakage function is determined before each vacuum baking, so that the water evaporation function and the baking stopping condition during the baking are determined, and the problem of low baking efficiency caused by the fact that the leakage rate of equipment is not considered in the prior art is solved.
2. According to the control method for baking the lithium ion battery, provided by the invention, the action of the baking program is controlled through the variation trend of the gas pressure in the cavity of the baking box, the baking action which is automatically adaptive and reasonable to the water content of different batteries can be realized, and the baking efficiency is further greatly improved.
3. According to the control method for baking the lithium ion battery, provided by the invention, the moisture evaporation function during baking is determined so as to determine the baking stop condition, so that the problems of insufficient baking or low efficiency caused by controlling the baking stop through time in the prior art are solved.
Drawings
FIG. 1 is a schematic diagram of the pressure change curve in the baking chamber during the vacuum baking process in the prior art;
fig. 2 is a schematic flowchart of a control method for baking a lithium ion battery according to this embodiment;
fig. 3 is a schematic diagram of a pressure change curve in a baking oven in the control method for baking the lithium ion battery according to the embodiment.
Detailed Description
The invention is described in detail below with reference to the figures and the specific embodiments.
Examples
Referring to fig. 2, the present embodiment provides a control method for baking a lithium ion battery, including the following steps:
s1: determining a function of the pressure rise of the baking equipment caused by leakage, namely a leakage function of the baking equipment;
s2: setting a plurality of parameters of the vacuum baking process, placing the battery in baking equipment for vacuum baking, and acquiring a function of pressure rise of the battery due to water evaporation in the vacuum baking process, namely a water evaporation function, in real time according to the leakage function;
specifically, the parameters include ultimate vacuum pressure, upper vacuum limit pressure, lower vacuum limit pressure, drying pressure, termination time, baking temperature, and upper vacuum pumping time limit.
Specifically, the upper limit pressure of the vacuum degree needs to be set for a plurality of times in the vacuum baking process according to specific conditions, and the pressure is set for a plurality of times.
Specifically, referring to fig. 3, the battery is placed in a baking device for vacuum baking, in the vacuum baking process, when the pressure inside a cavity of the baking device rises to the upper limit pressure of the vacuum degree (as the high point of a first curve shown in fig. 3), inert gas or dry gas is automatically introduced into the cavity, so that the gas pressure inside the cavity reaches the dry pressure, after uniform mixing, mixed gas is extracted until the pressure inside the cavity falls to the lower limit pressure of the vacuum degree, and baking is continued; when the pressure in the cavity rises to the upper limit of the vacuum degree again, introducing inert gas or dry gas again, uniformly mixing, extracting mixed gas, and circularly working;
specifically, in the process of extracting the mixed gas until the pressure in the cavity is reduced to the vacuum degree lower limit pressure, if the required time exceeds the upper limit of the vacuumizing time, the leakage amount of the baking equipment is too large, and the baking equipment is stopped.
Meanwhile, a function of pressure rise and time in the cavity of the battery in the vacuum baking process, namely a pressure rise function, is monitored and obtained in real time, and then a water evaporation function is obtained, wherein the calculation formula of the water evaporation function is specifically as follows:
wherein g (t) is a water evaporation function, f (t) is a pressure rise function,
as a function of leakage.
As an alternative embodiment, the lower limit pressure of the vacuum is 100pa, and the drying pressure is in the range of 10Kpa to 100 Kpa.
Further, before S2, the gas in the cavity of the baking apparatus may be replaced;
the gas replacement process specifically comprises the following steps: placing the battery in baking equipment, performing primary vacuum pumping in the cavity to enable the air pressure in the cavity to reach the upper limit pressure of vacuum degree, baking, introducing inert gas or dry gas into the cavity to enable the pressure in the cavity to reach the dry pressure, performing secondary vacuum pumping to enable the air pressure in the cavity to reach the lower limit pressure of vacuum degree, and realizing gas replacement in the baking equipment;
replacing the gas in the baking apparatus cavity before S2 is used to reduce the humidity of the gas in the baking apparatus.
S3: and the computer judges whether the baking stopping condition is met or not according to the water evaporation function, and baking is finished if the baking stopping condition is met.
Specifically, the computer acquires the pressure generated by battery baking moisture evaporation at the moment according to the moisture evaporation function, and stops baking if the pressure generated by the battery due to the moisture evaporation does not reach the upper limit pressure of the vacuum degree within the termination time.
Specifically, for the baking device used for the first time, the step of determining the leakage function is specifically as follows:
the method comprises the steps of placing baking equipment used for the first time under an idle condition, vacuumizing a cavity of the baking equipment, enabling air pressure in the cavity to reach ultimate vacuum pressure, closing all valves and switches of the baking equipment, enabling the baking equipment to keep a sealed state, collecting pressure data of all times from the ultimate vacuum pressure to vacuum degree upper limit pressure in the baking equipment in the sealed state, storing all the pressure data to a computer, and determining a leakage function according to the pressure data by the computer.
Specifically, the process of determining the leakage function is specifically:
(1) collecting pressure data of the baking equipment from ultimate vacuum pressure to vacuum degree upper limit pressure in an unloaded and sealed state, and further acquiring an initial pressure rise function y1＝f(t)；
(2) Deriving the initial pressure rise function to obtain the pressure rise rate function y at each moment2＝f’(t)；
(3) The inverse function converts the pressure rise rate function into a function of the pressure rise rate changing with the pressure, and then the function of the pressure rise rate changing with the pressure is integrated to obtain the leakage function
The specific formula is as follows:
t＝f-1(y1)
y2＝f'(f-1(y1))
as an alternative embodiment, the value of the ultimate vacuum pressure is less than or equal to 10pa, and the value of the upper limit pressure of the set vacuum degree is 300pa or 500 pa.
Specifically, for the baking device used for the Nth time (N is more than or equal to 2), the leakage function is determined to be as follows:
and automatically correcting the leakage function during the Nth vacuum baking by a computer according to the leakage function and the water evaporation function of the baking equipment during the (N-1) th vacuum baking.
And (3) performing data trend fitting on the big data of the previous N-1 times of baking processes to obtain the variation trend of the pressure rising rate in the baking process, and then adjusting the leakage function according to the trend.
In summary, according to the control method for baking the lithium ion battery provided by the invention, the leakage function is determined before each vacuum baking, and then the moisture evaporation function and the baking stop condition during the baking are determined, so that the problem of low baking efficiency caused by the fact that the leakage rate of equipment is not considered in the prior art is solved. The change trend through the gas pressure who toasts in the case cavity body controls the procedure action of toasting, can accomplish the reasonable action of toasting of the automatic adaptation of different battery water contents, and then very big improvement toasts efficiency. The baking stop condition is determined by determining the moisture evaporation function during the baking, so that the problems of insufficient baking or low efficiency caused by controlling the baking stop through time in the prior art are solved.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (10)
1. A control method for baking a lithium ion battery is characterized by comprising the following steps:
s1: determining a function of pressure rise of the baking equipment caused by leakage, namely a leakage function of the baking equipment;
s2: setting a plurality of control parameters of the vacuum baking process, placing the battery in baking equipment for vacuum baking, controlling the operation of each step in the vacuum baking process based on the control parameters, and simultaneously acquiring a function of pressure rise of the battery due to water evaporation in the vacuum baking process, namely a water evaporation function, in real time according to the leakage function;
s3: and judging whether the baking stopping condition is met or not according to the water evaporation function, and if so, finishing baking.
2. The control method for baking the lithium ion battery as claimed in claim 1, wherein the parameters include ultimate vacuum pressure, upper vacuum degree limit pressure, lower vacuum degree limit pressure, drying pressure, termination time, baking temperature and upper vacuum pumping time limit.
3. The control method for baking the lithium ion battery according to claim 2, wherein the S1 specifically is:
for the baking equipment used for the first time, the baking equipment used for the first time is placed under the no-load condition, the cavity of the baking equipment is vacuumized to enable the air pressure in the cavity to reach the ultimate vacuum pressure, all valves and switches of the baking equipment are closed to enable the baking equipment to be kept in a sealed state, pressure data of all moments from the ultimate vacuum pressure to the vacuum degree upper limit pressure in the baking equipment in the sealed state are collected, all the pressure data are stored in a computer, and a leakage function is determined by the computer according to all the pressure data.
4. The control method for baking the lithium ion battery according to claim 3, wherein the process of determining the leakage function by the computer according to all the pressure data is specifically as follows:
collecting pressure data of all moments from ultimate vacuum pressure to vacuum degree upper limit pressure in the baking equipment in an unloaded and sealed state, and further acquiring an initial pressure rise function;
deriving the initial pressure rise function to obtain a pressure rise rate function at each moment;
and converting the pressure rise rate function into a function of the pressure rise rate changing along with the pressure by an inverse function, and integrating the function of the pressure rise rate changing along with the pressure to obtain a leakage function.
5. The control method for baking the lithium ion battery according to claim 4, wherein the step S2 specifically comprises:
placing the battery in baking equipment for vacuum baking, automatically introducing inert gas or dry gas into the cavity when the pressure in the cavity of the baking equipment rises to baking upper limit pressure in the vacuum baking process so that the gas pressure in the cavity reaches set pressure, uniformly mixing, extracting mixed gas until the pressure in the cavity falls to vacuum lower limit pressure, and continuing baking; when the pressure in the cavity rises to the baking upper limit pressure again, introducing inert gas or dry gas again, uniformly mixing, extracting mixed gas, and circularly working;
meanwhile, a function of pressure rise and time in the cavity in the vacuum baking process of the battery, namely a pressure rise function, is monitored and obtained in real time, and then a water evaporation function is obtained.
6. The control method for baking the lithium ion battery as claimed in claim 5, wherein in the process of extracting the mixed gas until the pressure in the cavity is reduced to the lower limit pressure of the vacuum degree, if the required time exceeds the upper limit of the vacuumizing time, the leakage amount of the baking equipment is too large, and the baking equipment is stopped.
7. The control method for lithium ion battery baking of claim 5, wherein the calculation formula of the moisture evaporation function is as follows:
wherein g (t) is a water evaporation function, f (t) is a pressure rise function,
as a function of leakage.
8. The control method for baking the lithium ion battery according to claim 7, wherein the step S3 specifically comprises:
and the computer acquires the pressure generated by the battery baking water evaporation at the moment according to the water evaporation function, and stops baking if the pressure generated by the battery due to the water evaporation in the set time does not reach the baking upper limit pressure.
9. The control method for lithium ion battery baking of claim 5, wherein gas replacement is performed on gas in the baking equipment cavity before the step S2 is performed.
10. The control method for baking the lithium ion battery according to claim 9, wherein the gas replacement process specifically comprises:
the battery is placed in a baking device, the cavity is subjected to primary vacuumizing to enable the air pressure in the cavity to reach the upper limit pressure of vacuum degree, baking is conducted, inert gas or dry gas is introduced into the cavity to enable the pressure in the cavity to reach the dry pressure, secondary vacuumizing is conducted to enable the air pressure in the cavity to reach the lower limit pressure of vacuum degree, and gas replacement in the baking device is achieved.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115790081A (en) * | 2022-11-17 | 2023-03-14 | 兰钧新能源科技有限公司 | Vacuum baking device and method for lithium battery |
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