CN105322232B - Preparation method of electrochemical cell - Google Patents
Preparation method of electrochemical cell Download PDFInfo
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- CN105322232B CN105322232B CN201510675281.5A CN201510675281A CN105322232B CN 105322232 B CN105322232 B CN 105322232B CN 201510675281 A CN201510675281 A CN 201510675281A CN 105322232 B CN105322232 B CN 105322232B
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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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- 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
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
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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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Abstract
The invention belongs to the field of electrochemical cells, and particularly relates to a preparation method of an electrochemical cell, which comprises the following steps: the method mainly comprises four steps of pretreatment, soaking, electrolyte retention and control and finished product battery cell preparation, wherein gas components in electrode plate holes of the battery cell are discharged through the treatment to reserve a space for the electrolyte to soak; then, the battery cell is placed in the electrolyte for soaking, so that the battery cell is surrounded by sufficient electrolyte and is quickly soaked by the electrolyte; then, extruding the electrolyte solution by a fixed thickness under control so as to obtain the actual required electrolyte solution of the battery cell; and finally preparing the finished battery. The process is simple and reliable, and is convenient for industrialized low-cost production.
Description
Technical Field
The invention belongs to the field of energy storage, and particularly relates to a preparation method of an electrochemical cell.
Background
After the 21 st century, various electronic device products such as mobile phones, notebooks, wearable devices and the like are in endless, and the lives of the users are greatly enriched; meanwhile, electric vehicles and various energy storage power stations also sprout, develop and grow rapidly like spring bamboo shoots after rain. The above high-tech products have one common feature: high performance, low cost batteries are required to serve as energy storage components.
The existing batteries mainly comprise a primary battery and a secondary battery; the so-called primary battery, which is a battery that cannot be repeatedly charged, mainly includes a carbon zinc battery, an alkaline battery, a paste zinc-manganese battery, a cardboard zinc-manganese battery, an alkaline zinc-manganese battery, a button cell (a button zinc-silver battery, a button lithium-manganese battery, a button zinc-manganese battery), a zinc-air battery, a primary lithium-manganese battery, and the like, and a mercury battery; the secondary battery, i.e., a rechargeable battery, mainly includes a secondary alkaline zinc-manganese battery, a nickel-cadmium rechargeable battery, a nickel-hydrogen rechargeable battery, a lithium rechargeable battery, a lead-acid battery, and a solar battery. Lead-acid batteries can be divided into: open type lead-acid storage battery and totally-enclosed lead-acid storage battery. From the perspective of external packaging, the conventional batteries are mainly classified into flexible-packaged batteries and hard-shell-packaged batteries, and the flexible-packaged battery packaging film has small thickness and large plasticity, so that the battery is widely applied to various high-grade primary batteries and secondary batteries.
However, with the gradual increase of the battery consumption, the cost proportion of the battery cost in the equipment is gradually increased, and particularly in the electric automobile and the energy storage power station, the battery cost accounts for 30 percent of the total cost, even more than 50 percent; in view of this, it is very important to reduce the cost of the battery. The cost of the battery mainly comprises raw material cost and manufacturing cost, wherein the manufacturing cost accounts for more than 30 percent of the cost of the battery; therefore, how to reduce the manufacturing cost of the battery becomes a research topic of the majority of battery manufacturing researchers.
For an organic electrolyte battery, a battery core is usually required to be dried and then injected with liquid, the liquid is injected and then passes through a slow electrolyte infiltration process, formation is started when the electrolyte is fully immersed, and the processes are complicated, time-consuming and long, and occupy a large amount of manufacturing cost.
In view of the above, there is a need to develop a new method for manufacturing an electrochemical cell, which can greatly simplify the process and shorten the process time, thereby improving the production efficiency and reducing the production cost.
Disclosure of Invention
The invention aims to: aiming at the defects of the prior art, the preparation method of the electrochemical cell is provided: the method mainly comprises four steps of pretreatment, soaking, electrolyte retention and control and finished product battery cell preparation, wherein firstly, gas components in electrode plate holes of the battery cell are discharged through the pretreatment, and a reserved space is reserved for the electrolyte soaking; then, the battery cell is placed in the electrolyte for soaking, so that the battery cell is surrounded by sufficient electrolyte and is quickly soaked by the electrolyte; then, extruding the electrolyte solution by a fixed thickness under control so as to obtain the actual required electrolyte solution of the battery cell; and finally, preparing the finished battery. The process is simple and reliable, and is convenient for industrialized low-cost production.
In order to achieve the purpose, the invention adopts the following technical scheme:
a preparation method of an electrochemical cell mainly comprises the following steps:
step 1, pretreatment: placing the battery cell in an environment with the atmospheric pressure less than or equal to 1000Pa for 10 s-10 h, and then obtaining the battery cell to be soaked; the battery cell is arranged in a high vacuum environment for a long time, so that gas components in the electrode micropores of the battery cell can be fully discharged from the electrode and the battery cell, the electrode holes can really reach a vacuum state, a space is provided for the infiltration of electrolyte, meanwhile, the air pressure in the micropores in the immersion process is reduced, the pressure difference inside and outside the micropores is increased, and the infiltration process of the electrolyte is accelerated.
Step 2, soaking: keeping the atmospheric pressure less than or equal to 1000Pa and the temperature of-10-100 ℃, and soaking the battery cell obtained in the step (1) in the electrolyte until the electrolyte completely soaks the electrode diaphragm; after pretreatment, keeping the atmospheric pressure in a high vacuum state, and then placing the battery cell in the electrolyte, so that the battery cell is sealed by the electrolyte, and gas can be prevented from being re-filled into the electrode micropores; and because the battery cell is in a higher vacuum degree, the volatilization speed of the electrolyte can be reduced by reducing the temperature of the electrolyte, so that the temperature of the components of the electrolyte is maintained, and the battery cell with excellent performance is prepared. Of course, in order to increase the immersion speed, after the battery cell is completely sealed by the electrolyte, the atmospheric pressure can be increased, and the temperatures of the battery cell and the electrolyte can be increased, so that the immersion speed of the electrolyte can be further increased.
Step 3, controlling the electrolyte retention: pressing the thickness of the bare cell obtained in the step two to h1 by adopting an extrusion mode, wherein the thickness of the bare cell is h when the cell is in 50% SOC (State of charge), and h1 is more than or equal to 0.9h and less than or equal to 1.1h; by controlling the thickness of the battery cell, the amount of the electrolyte can be effectively controlled, and the battery cell is ensured to have excellent cycle performance.
Step 4, preparing a finished product battery core: and (4) putting the battery cell obtained in the step (3) into a shell/bag, sealing/packaging, and then performing formation, shaping and degassing procedures to obtain a finished product battery cell.
As an improvement of the preparation method of the electrochemical battery, the electrochemical battery comprises one of an organic super capacitor, a lithium ion battery, a sodium ion battery and a lithium sulfur battery, namely the invention is applicable to various electrochemical systems.
As an improvement of the preparation method of the electrochemical cell of the present invention, the cell in step 1 is a dried cell or/and an undried cell; the method for achieving the atmospheric pressure of less than or equal to 1000Pa is vacuum pumping.
As an improvement of the preparation method of the electrochemical battery, when the battery cell in the step 1 is an undried battery cell, the temperature of 45-130 ℃ is applied to the battery cell in the pretreatment stage, namely, the battery cell is baked.
As an improvement of the preparation method of the electrochemical cell, the solvent in the step 1 is at least one of water, nitrogen methyl pyrrolidone, ethanol and methanol; the atmospheric pressure in the environment is less than or equal to 200Pa, the standing time in the environment is 30 s-2 h, and the battery cell is placed in high vacuum for enough time, so that gas components adsorbed in the porous structure electrode holes of the battery cell can be fully diffused out, and enough space is cleaned for immersing the electrolyte.
As an improvement of the method for preparing the electrochemical cell of the present invention, before the cell in step 2 is completely immersed in the electrolyte, the atmosphere pressure is maintained to be less than or equal to 1000Pa, so that the cleaned space is ensured not to be filled with gas again.
As an improvement of the preparation method of the electrochemical cell, the atmospheric pressure in the environment in the step 2 is less than or equal to 200Pa, the temperature is-10 ℃ to 60 ℃, more preferably, the environmental temperature is-10 ℃ to 40 ℃, and the volatilization of the solvent in the electrolyte can be slowed down to prevent the performance change of the electrolyte caused by the volatilization of the solvent at a lower temperature, so that the performance of the cell is ensured; or the atmospheric pressure of the electrolyte in the environment can be increased, and the volatilization of the solvent in the electrolyte can be inhibited.
As an improvement of the preparation method of the electrochemical battery, after the battery cell is completely soaked in the electrolyte in the step 2, the battery cell and the environment are treated by at least one method of heating the electrolyte to be less than or equal to 100 ℃, removing the vacuum in the environment, applying the pressure of 0.02MPa to 50MPa to the environment and performing extrusion-release-re-extrusion circulation operation on the battery cell, and when the air pressure in the environment is increased, the volatilization speed of the electrolyte solvent is reduced, so that the temperatures of the electrolyte and the battery cell can be increased, the viscosity of the electrolyte is reduced, and the infiltration is accelerated.
As an improvement of the preparation method of the electrochemical cell, in the step 3, h1 is more than or equal to 0.95h and less than or equal to 1.05h.
As an improvement to the method of making the electrochemical cell of the present invention, the electrochemical cell is a soft pack cell or a hard pack cell; the packaging bag of the flexible packaging battery is at least one of an aluminum plastic film, a steel plastic film, a stainless steel film and an aluminum foil; the packaging shell for the hard shell packaging battery is at least one of a stainless steel shell, an aluminum shell and a copper shell; the packaging includes heat sealing or/and induction packaging.
The invention has the beneficial effects that: firstly, gas components in holes of electrode plates of the battery cell are discharged through pretreatment, and a reserved space is reserved for electrolyte infiltration; then, the battery cell is placed in the electrolyte for soaking, so that the battery cell is surrounded by sufficient electrolyte and is quickly soaked by the electrolyte; then, extruding the electrolyte solution by a fixed thickness under control so as to obtain the actual required electrolyte solution of the battery cell; and finally preparing the finished battery. The process is simple and reliable, and is convenient for industrialized low-cost production.
Detailed Description
The present invention and its advantageous effects will be described in detail below with reference to specific embodiments, but the embodiments of the present invention are not limited thereto.
In the comparative example, the following examples were conducted,
preparing a to-be-dried battery cell: winding the positive plate, the isolation film and the negative plate to obtain a bare cell, and then selecting an aluminum plastic film as an outer packaging material to carry out top side sealing to obtain a cell to be dried;
preparing a battery cell to be injected: placing the battery cell in a drying furnace, setting the furnace temperature to 80 ℃, and ventilating and preheating; when the battery core is preheated to 78 ℃ (the temperature is needed when the battery core is dried), the furnace is vacuumized to 4kpa, and the temperature in the furnace is kept at 80 ℃ for drying; when the water content in the battery cell is lower than 200ppm, drying is finished;
liquid injection: taking out the dried battery cell from the furnace, placing the battery cell in a dry atmosphere, injecting liquid (the temperature of the electrolyte is 25 ℃), then carrying out vacuum packaging, and standing until the electrolyte is fully soaked;
preparing a finished battery: the fully immersed battery was formed, shaped, degassed, packaged, and then charged to 50% SOC to obtain a finished battery with a thickness of 2.453 mm.
Example 1, unlike comparative example 1, this example includes the following steps:
preparing an electric core: winding the positive plate, the isolating membrane and the negative plate to obtain a bare cell, then placing the bare cell in a drying furnace, setting the furnace temperature to 80 ℃, and ventilating and preheating; when the battery cell is preheated to 78 ℃ (the temperature is needed when the battery cell is dried), vacuumizing the furnace to 4kpa, and keeping the temperature in the furnace to be 80 ℃ for drying; when the water content in the battery cell is lower than 200ppm, drying is finished;
pretreatment: vacuumizing the dried battery cell to be injected with the liquid for 10 hours in an environment of 1000Pa, and keeping the temperature of the battery cell at 60 ℃ to obtain a bare battery cell with soaking;
soaking: keeping the vacuum degree, placing the 60 ℃ bare cell in 25 ℃ electrolyte to enable the bare cell to be sealed by the electrolyte, and then soaking until the electrolyte fully infiltrates the diaphragm;
controlling the electrolyte retention: taking out the fully soaked bare cell from the electrolyte, then extruding more electrolyte out of the interior of the cell by adopting an extrusion mode, and controlling the thickness of the cell to be 2.453mm (namely the thickness of h 1);
preparing a finished product battery cell: and selecting an aluminum plastic film as an outer packaging material, carrying out top sealing and side sealing, namely vacuum packaging on the battery cell, and then carrying out the procedures of formation, shaping and degassing to obtain a finished product battery cell.
The rest is the same as the comparative example, and the description is omitted.
Embodiment 2, unlike embodiment 1, this embodiment includes the following steps:
pretreatment: vacuumizing the dried battery cell to be injected in an environment of 200Pa for 2h, and keeping the temperature of the battery cell at 60 ℃ to obtain a bare battery cell with soaking;
the rest is the same as embodiment 1, and the description is omitted here.
Embodiment 3, different from embodiment 1, this embodiment includes the following steps:
pretreatment: vacuumizing the dried battery cell to be injected with the liquid for 1h in an environment with 100Pa, and keeping the temperature of the battery cell at 60 ℃ to obtain a naked battery cell with soaking function;
the rest is the same as embodiment 1, and the description is omitted here.
Embodiment 4, unlike embodiment 1, this embodiment includes the following steps:
pretreatment: vacuumizing the dried battery cell to be injected in a 10Pa environment for 2min, and keeping the temperature of the battery cell at 60 ℃ to obtain a bare battery cell with soaking;
the rest is the same as embodiment 1, and the description is omitted here.
Example 5, unlike example 1, this example includes the following steps:
pretreatment: vacuumizing the dried battery cell to be injected in an environment of 1Pa for 30s, and keeping the temperature of the battery cell at 60 ℃ to obtain a bare battery cell with soaking;
the rest is the same as embodiment 1, and the description is omitted here.
Embodiment 6, unlike embodiment 1, this embodiment includes the following steps:
pretreatment: vacuumizing the dried battery cell to be injected with the liquid for 10s in an environment with 0.1Pa, and keeping the temperature of the battery cell at 60 ℃ to obtain a bare battery cell with the soaking function;
the rest is the same as embodiment 1, and the description is omitted here.
Example 7, unlike example 1, this example includes the following steps:
pretreatment: vacuumizing the dried battery cell to be injected in an environment of 40Pa for 1min, and keeping the temperature of the battery cell at 130 ℃ to obtain a bare battery cell with soaking;
soaking: keeping the vacuum degree, placing the 130 ℃ bare cell in 100 ℃ electrolyte to enable the bare cell to be sealed by the electrolyte, and then soaking until the electrolyte fully infiltrates the diaphragm;
the rest is the same as embodiment 1, and the description is omitted here.
Embodiment 8, different from embodiment 1, this embodiment includes the following steps:
pretreatment: vacuumizing the dried battery cell to be injected in an environment of 40Pa for 1min, and keeping the temperature of the battery cell at 45 ℃ to obtain a bare battery cell with soaking;
soaking: keeping the vacuum degree, placing the 45-DEG C bare cell in 60-DEG C electrolyte, sealing the bare cell by the electrolyte, and then soaking until the electrolyte fully infiltrates the diaphragm;
the rest is the same as embodiment 1, and the description is omitted here.
Example 9, unlike example 1, this example includes the following steps:
soaking: keeping the vacuum degree, placing the bare cell at 45 ℃ in electrolyte at 40 ℃ to ensure that the bare cell is sealed by the electrolyte liquid, and then soaking until the electrolyte fully infiltrates the diaphragm;
the rest is the same as embodiment 1, and the description is omitted here.
Embodiment 10, different from embodiment 1, this embodiment includes the following steps:
soaking: keeping the vacuum degree, placing the 45-DEG C bare cell in 20-DEG C electrolyte, sealing the bare cell by the electrolyte, and then soaking until the electrolyte fully infiltrates the diaphragm;
the rest is the same as embodiment 1, and the description is omitted here.
Example 11, unlike example 1, this example includes the steps of:
soaking: keeping the vacuum degree, placing the bare cell at 45 ℃ in electrolyte at 0 ℃ to ensure that the bare cell is sealed by the electrolyte liquid, and then soaking until the electrolyte fully infiltrates the diaphragm;
the rest is the same as embodiment 1, and the description is omitted here.
Example 12, unlike example 1, this example includes the steps of:
soaking: keeping the vacuum degree, placing the bare cell at 45 ℃ in electrolyte at-10 ℃ to ensure that the bare cell is sealed by the electrolyte liquid, and then soaking until the electrolyte fully infiltrates the diaphragm;
the rest is the same as embodiment 1, and the description is omitted here.
Example 13, unlike example 1, this example includes the steps of:
pretreatment: vacuumizing the dried battery cell to be injected with the liquid for 1.5min in an environment of 60Pa, and keeping the temperature of the battery cell at 60 ℃ to obtain a naked battery cell with soaking function;
soaking: keeping the vacuum degree, placing the 60-DEG C bare cell in 30-DEG C electrolyte, sealing the bare cell by the electrolyte, then removing the vacuum, rapidly heating the electrolyte and the cell to 100 ℃ for soaking, and simultaneously pressing the soaking container to 50MPa until the electrolyte fully soaks the diaphragm;
controlling the electrolyte retention: taking out the fully soaked bare cell from the electrolyte, then extruding more electrolyte out of the interior of the cell by adopting an extrusion mode, and controlling the thickness of the cell to be 2.453mm (namely the thickness of h 1);
preparing a finished product battery cell: and selecting an aluminum-plastic film as an outer packaging material, carrying out top sealing and side sealing, namely vacuum packaging on the battery cell, and then carrying out the procedures of formation, shaping and degassing to obtain a finished product battery cell.
The rest is the same as embodiment 1, and the description is omitted here.
Example 14, unlike example 1, this example includes the steps of:
pretreatment: vacuumizing the dried battery cell to be injected with the liquid for 0.5min in an environment with the pressure of 20Pa, and keeping the temperature of the battery cell at 50 ℃ to obtain a naked battery cell with soaking function;
soaking: keeping the vacuum degree, placing the 50 ℃ naked electric core in 40 ℃ electrolyte to enable the naked electric core to be sealed by the electrolyte liquid, then removing the vacuum, rapidly heating the electrolyte and the electric core to 70 ℃ for soaking, in the process, processing the soaked electric core by using extrusion-release-re-extrusion circulation operation, and simultaneously applying 0.02MPa surface pressure to a soaking container until the electrolyte fully soaks the diaphragm;
controlling the electrolyte retention: taking out the fully soaked bare cell from the electrolyte, then extruding more electrolyte out of the interior of the cell by adopting an extrusion mode, and controlling the thickness of the cell to be 2.453mm (namely the thickness of h 1);
preparing a finished product battery cell: and selecting an aluminum plastic film as an outer packaging material, carrying out top sealing and side sealing, namely vacuum packaging on the battery cell, and then carrying out the procedures of formation, shaping and degassing to obtain a finished product battery cell.
The rest is the same as embodiment 1, and the description is omitted here.
Embodiment 15, different from embodiment 1, this embodiment includes the following steps:
pretreatment: vacuumizing the dried battery cell to be injected with the liquid for 0.5min in an environment of 5Pa, and keeping the temperature of the battery cell at 50 ℃ to obtain a bare battery cell with soaking;
soaking: keeping the vacuum degree, placing the 50 ℃ naked electric core in 40 ℃ electrolyte to enable the naked electric core to be sealed by the electrolyte liquid, then removing the vacuum, rapidly heating the electrolyte and the electric core to 70 ℃ for soaking, in the process, processing the soaked electric core by using extrusion-release-re-extrusion circulation operation, and simultaneously applying 2MPa surface pressure to a soaking container until the electrolyte fully soaks the diaphragm;
controlling the electrolyte retention: taking out the fully soaked bare cell from the electrolyte, then extruding more electrolyte out of the interior of the cell by adopting an extrusion mode, and controlling the thickness of the cell to be 2.453mm (namely the thickness of h 1);
preparing a finished product battery cell: and selecting an aluminum-plastic film as an outer packaging material, carrying out top sealing and side sealing, namely vacuum packaging on the battery cell, and then carrying out the procedures of formation, shaping and degassing to obtain a finished product battery cell.
The rest is the same as embodiment 1, and the description is omitted here.
Example 16, unlike example 4, this example includes the steps of:
controlling the electrolyte retention: taking out the fully soaked bare cell from the electrolyte, extruding the electrolyte out of the interior of the cell in an extrusion mode, and controlling the thickness of the cell to be 2.208mm (namely 0.9h1);
the rest is the same as embodiment 4, and the description is omitted here.
Example 17, unlike example 4, this example includes the steps of:
controlling the electrolyte retention: taking out the fully soaked bare cell from the electrolyte, extruding more electrolyte out of the cell by adopting an extrusion mode, and controlling the thickness of the cell to be 2.330mm (namely 0.95h1);
the rest is the same as embodiment 4, and the description is omitted here.
Embodiment 18, different from embodiment 4, this embodiment includes the following steps:
controlling the electrolyte retention: taking out the fully soaked bare cell from the electrolyte, extruding more electrolyte in the cell by adopting an extrusion mode, and controlling the thickness of the cell to be 2.576mm (namely the thickness of 1.05h1);
the rest is the same as embodiment 4, and the description is omitted here.
Embodiment 19, different from embodiment 4, this embodiment includes the steps of:
controlling the electrolyte retention: taking out the fully soaked naked battery core from the electrolyte, then extruding more electrolyte out of the interior of the battery core by adopting an extrusion mode, and controlling the thickness of the battery core to be 2.698mm (namely the thickness of 1.1h1);
the rest is the same as embodiment 4, and the description is omitted here.
Characterization and testing:
soaking time t1: disassembling one battery cell after liquid injection every 1min, observing the condition of the electrolyte soaking electrode, considering that the electrolyte is fully soaked when all areas of the electrode are fully paved by the electrolyte, and recording the time from liquid injection to full soaking of the electrolyte;
and (3) counting the liquid swelling proportion of the battery core: respectively taking 30 cells in each group, carrying out swelling liquid ratio statistics, observing the surfaces of the cells, regarding the cells as swelling liquids if the surfaces of the cells have obvious unevenness, and counting the number of the cells;
and (3) testing the cycle performance: carrying out capacity test on the battery cell in an environment of 35 ℃ according to the following flow: standing for 3min; charging to 4.2V at constant current of 0.5C and charging to 0.05C at constant voltage; standing for 3min; discharging at constant current of 0.5C to 3.0V to obtain first discharge capacity D0; the above steps were repeated 499 times thereafter to obtain D499, and the cycle test was completed after standing for 3min, and the cell capacity retention ratio = D499/D0, and the obtained results are shown in table 1.
TABLE 1 test result table of the batteries of comparative examples and examples
Comparing the comparative examples and examples in table 1, the present invention can greatly shorten the process time and reduce the manufacturing cost.
As can be seen from analysis of table 1, comparing the comparative examples with comparative examples 1 to 6, the time required for impregnation was gradually reduced as the atmospheric pressure of the cell during the pretreatment was reduced, because the gas in the micropores of the cell electrode was more thoroughly diffused during the treatment as the atmospheric pressure of the cell was reduced, thereby facilitating the impregnation.
Comparing the comparative examples with comparative examples 12 to 7, it can be seen that the time required for impregnation gradually decreases as the temperature of the electrolyte increases during immersion, since the viscosity of the electrolyte decreases after the temperature increases, which is more advantageous for impregnation; at the same time, however, since the electrolyte is in a higher vacuum degree, the volatilization speed of the electrolyte is gradually increased along with the increase of the temperature, especially the low boiling point component in the electrolyte is easier, and the additive is often the component with a lower boiling point in the electrolyte, so that the components of the electrolyte are changed, and finally the cycle performance of the battery cell is deteriorated (as in example 7).
Compared with the examples 4, 16 and 19, when the thickness of the naked battery cell is small during extrusion, the extrusion electrolyte is too much, the retention amount of the electrolyte is insufficient, and the battery cell can cause the cycle water jump; when naked electric core thickness was higher during the extrusion, it is too little to extrude electrolyte, and electrolyte is kept the volume too much, will make finished product electric core rise liquid, influences the electric core outward appearance. Therefore, the thickness of the bare cell during extrusion must be strictly controlled.
Variations and modifications to the above-described embodiments may also occur to those skilled in the art, which fall within the scope of the invention as disclosed and taught herein. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious improvement, replacement or modification made by those skilled in the art based on the present invention is within the protection scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (10)
1. A method for preparing an electrochemical cell, comprising the steps of:
step 1, pretreatment: placing the battery cell in an environment with the atmospheric pressure less than or equal to 1000Pa for 10 s-10 h, and then obtaining the battery cell to be soaked;
step 2, soaking: keeping the atmospheric pressure less than or equal to 1000Pa and the temperature of-10-100 ℃, and soaking the battery cell obtained in the step (1) in the electrolyte until the electrolyte completely soaks the electrode diaphragm;
step 3, controlling the electrolyte holding amount: pressing the thickness of the bare cell obtained in the step two to h1 by adopting an extrusion mode, wherein the thickness of the bare cell is h when the cell is in 50% SOC, and h1 is more than or equal to 0.9h and less than or equal to 1.1h;
step 4, preparing a finished product battery core: and (4) putting the battery cell obtained in the step (3) into a shell/bag, sealing/packaging, and then carrying out the procedures of formation, shaping and degassing to obtain a finished product battery cell.
2. A method of making an electrochemical cell according to claim 1, wherein the electrochemical cell comprises one of an organic-based supercapacitor, a lithium ion battery, a sodium ion battery, and a lithium sulfur battery.
3. A method of making an electrochemical cell according to claim 1, wherein the cell of step 1 is a dried cell or/and an undried cell; the method for achieving the atmospheric pressure of less than or equal to 1000Pa is vacuum pumping.
4. A method for preparing an electrochemical cell according to claim 3, wherein, when the cell in step 1 is an undried cell, the cell is placed in a temperature environment of 45 ℃ to 130 ℃ in the pretreatment stage.
5. The method of claim 1, wherein the atmospheric pressure in the environment of step 1 is less than or equal to 200Pa, and the cell is left in the environment for 30s to 2h.
6. A method of making an electrochemical cell according to claim 1, wherein the cell is maintained at an atmospheric pressure of 1000Pa or less before being completely immersed in the electrolyte in step 2.
7. A method of making an electrochemical cell according to claim 1, wherein the atmospheric pressure in step 2 is less than or equal to 200Pa and the temperature is in the range of-10 ℃ to 60 ℃.
8. The method of claim 1, wherein after the cell is completely immersed in the electrolyte in step 2, the cell and the environment are treated by at least one of heating the electrolyte to less than or equal to 100 ℃, removing the vacuum from the environment, applying a pressure of 0.02MPa to 50MPa to the environment, and subjecting the cell to a squeeze-release-squeeze cycle.
9. A method of manufacturing an electrochemical cell according to claim 1, wherein in step 3, 0.95h 1.
10. A method of making an electrochemical cell according to claim 1, wherein the electrochemical cell is a soft pack cell or a hard pack cell; the packaging bag of the flexible packaging battery is at least one of an aluminum plastic film, a steel plastic film, a stainless steel film and an aluminum foil; the packaging shell of the hard shell packaging battery is at least one of a stainless steel shell, an aluminum shell and a copper shell; the packaging includes heat sealing or/and induction packaging.
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| CN201510675281.5A CN105322232B (en) | 2015-10-16 | 2015-10-16 | Preparation method of electrochemical cell |
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| CN105322232B true CN105322232B (en) | 2018-09-11 |
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| CN112582596B (en) | 2019-09-27 | 2021-10-15 | 宁德时代新能源科技股份有限公司 | Secondary battery, battery module, battery pack and device containing same |
| CN110828905A (en) * | 2019-11-19 | 2020-02-21 | 东莞汇洋动力科技有限公司 | Method for manufacturing lithium ion battery |
| CN112054246A (en) * | 2020-09-16 | 2020-12-08 | 江西安驰新能源科技有限公司 | Preparation process of high-efficiency lithium ion battery |
| CN112652824A (en) * | 2021-01-21 | 2021-04-13 | 天津市捷威动力工业有限公司 | Cylindrical lithium ion battery manufacturing process |
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