CN110783631A - Electrolyte infiltration method for lithium battery - Google Patents
Electrolyte infiltration method for lithium battery Download PDFInfo
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- CN110783631A CN110783631A CN201910991811.5A CN201910991811A CN110783631A CN 110783631 A CN110783631 A CN 110783631A CN 201910991811 A CN201910991811 A CN 201910991811A CN 110783631 A CN110783631 A CN 110783631A
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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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Abstract
The invention discloses an electrolyte infiltration method for a lithium battery, which comprises the following steps: after the lithium battery liquid injection is finished, the lithium battery is loaded into a lithium battery transfer box body and stands at normal temperature; placing a lithium battery transfer box body standing at normal temperature on a vibration tray, taking up a top cover sleeved with a rubber gasket, inserting a fastening handle at the end part of the top cover from the top of a screw rod to enable the rubber gasket to be pressed on the top of the lithium battery transfer box body, wherein the rubber gasket is used for protecting a lower layer lithium battery from being extruded and deformed, taking up a round handle, and screwing the round handle on the screw rod; the invention has the beneficial effects that: the soaking time of the electrolyte is favorably shortened, so that the free electrolyte is uniformly distributed, and the cycle life of the lithium battery at the later stage is favorably prolonged; through lithium battery vibration treatment, magazine particles and pole piece burrs introduced in the process of manufacturing the lithium battery can cause local micro short circuit, the self-discharge speed in the formation stage is accelerated, and the quick screening of the lithium battery which is unqualified in self-discharge is facilitated.
Description
Technical Field
The invention belongs to the technical field of lithium ion batteries, and particularly relates to an electrolyte infiltration method for a lithium battery.
Background
In the production process of the lithium ion secondary power battery, battery core liquid injection and standing are very important process operations, after the power battery is assembled, electrolyte is injected into the battery, the battery is allowed to stand after liquid injection, the electrolyte is enabled to fully soak positive and negative electrode materials and a battery diaphragm of the battery, and the electrolyte is used as a lithium ion current transmission medium in the charging and discharging process of the battery. After the lithium battery is injected with liquid, the electrolyte is not completely and rapidly immersed into the positive and negative pole pieces and the diaphragm, and can be fully soaked in the electrolyte for a long time, redundant free electrolyte is randomly distributed in the lithium battery, and the phenomenon that the capacity of the lithium battery is not reduced or reversely increased due to the fact that the electrolyte is locally lacked to influence the cycle life of the lithium battery or the capacity of the lithium battery is not reduced or increased in the process of capacity cycle can occur in the later cycle process. Particularly for energy lithium batteries, the positive and negative pole pieces have high surface density and high compaction density, and the electrolyte can be completely soaked in the electrolyte for a longer time. Therefore, it is necessary to study how to shorten the wetting time of the electrolyte and to ensure that the electrolyte is uniformly dispersed inside the lithium battery.
In recent years, some research institutes have reported improving the electrolyte infiltration method of lithium batteries, such as the liquid injection and standing method of a power battery with application number CN201210549547.8, wherein the power battery is a lithium iron phosphate battery, and the method comprises the following steps: injecting part of electrolyte into the power battery and then placing the power battery into a constant-temperature standing box; carrying out three times of vacuum pumping and three times of pressure adding on the power battery, and standing for a certain time after each time of vacuum pumping or pressure adding; releasing the pressure of the power battery to normal pressure, taking the power battery out of the constant-temperature standing box, and carrying out subsequent processes; the method can form a stable and compact solid electrolyte interface film on the surfaces of the anode and cathode plate materials of the battery, effectively improves the performance of the iron phosphate power battery, and reduces the electrohydraulic loss.
The method for soaking the electrolyte of the lithium battery with the application number of CN201910028193.4 is provided; a first vacuum step, in which the lithium battery is kept stand in a vacuum environment with the vacuum degree of-0.08 MPa to-0.099 MPa; a first atmospheric step: standing the lithium battery after the first vacuum step is stood in a normal atmospheric pressure environment; high-pressure step: standing the lithium battery after the first normal pressure step in a high-pressure environment with the pressure intensity of more than 0.7 MPa; a second normal pressure step: standing the lithium battery after the high-pressure step is stood in a normal atmospheric pressure environment; a second vacuum step: standing the lithium battery after the second normal pressure step in a vacuum environment with the vacuum degree of-0.08 MPa to-0.099 MPa; the infiltration method can enable the electrolyte to achieve the effect of full infiltration by continuously and alternately changing the environment of the lithium battery, and can prevent the lithium battery from bulging and deforming, and has the defects that the operation is complex, the pressure of the equipment needs to be frequently changed, and meanwhile, the sealing performance of the lithium battery is easily damaged by vacuumizing operation.
Disclosure of Invention
The invention aims to provide an electrolyte infiltration method for a lithium battery, which aims to solve the problems of complex process, frequent operation and high energy consumption in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: an electrolyte infiltration method for a lithium battery comprises the following steps:
the method comprises the following steps: after the lithium battery liquid injection is finished, the lithium battery is loaded into a lithium battery transfer box body and stands at normal temperature;
step two: placing the lithium battery transfer box body which is kept stand at the normal temperature in the step one on a vibration tray, taking up a top cover sleeved with a rubber gasket, inserting a fastening handle at the end part of the top cover from the top of a screw rod, pressing the rubber gasket on the top of the lithium battery transfer box body, using the rubber gasket to protect a lower layer lithium battery from being extruded and deformed, taking up a round handle, and screwing the round handle on the screw rod;
step three: the vibration equipment is operated through the switch and the frequency conversion knob, so that the lithium battery transfer box body is vibrated on the vibration tray;
step four: and (4) placing the lithium battery transfer box body and the lithium battery at normal temperature or placing the lithium battery in a high-temperature oven for high-temperature placement.
As a preferred technical solution of the present invention, the lithium battery types include a flexible package lithium battery and a square lithium battery.
As an optimal technical scheme, the lithium batteries are horizontally laid in the lithium battery transfer boxes, the number of the lithium batteries in each lithium battery transfer box is less than or equal to 15, and if too many lithium batteries are laid, the lithium batteries slide down, so that the problem of mutual collision and extrusion is caused.
As a preferred technical scheme of the invention, after the liquid injection is finished, the lithium battery is firstly kept stand for 8-12h, so that more parts (including positive and negative pole pieces and a diaphragm) contacting with the electrolyte in the lithium battery are fully soaked.
As a preferred technical scheme of the invention, the lithium battery transfer box body and the lithium battery vibrate together, the vibration equipment only provides vibration in the vertical direction, the vibration frequency can be controlled to be 0-10Hz, the transverse movement of the lithium batteries is reduced, the mutual sliding between the lithium batteries is prevented, and after the vibration starts, the frequency conversion knob is adjusted to gradually increase the vibration frequency from small to large.
As a preferable technical scheme of the invention, before the transfer box body and the lithium battery start to vibrate, a lithium battery (false battery core) without liquid injection is placed between the lithium battery and the top cover of the top end of the vibration equipment, and is used for protecting the lithium battery after the lower-layer liquid injection from being extruded.
As a preferred technical scheme of the invention, before the lithium battery transfer box body and the lithium batteries start to vibrate, the lithium batteries placed in the lithium battery transfer box body are placed in order, the dislocation range of the upper lithium battery and the lower lithium battery is 0-3mm, particularly for soft-packaged lithium batteries, the aluminum plastic films on the outer surfaces are smooth, and if the upper lithium battery and the lower lithium battery are dislocated too much, the phenomenon of slipping is easily caused.
As a preferable technical scheme of the invention, the vibration time of the transfer box body of the lithium battery and the lithium battery is 1-10min, and the specific time is set according to the experimental needs.
As a preferred technical scheme of the invention, in the fourth step, the transfer box body of the lithium battery and the lithium battery are placed for 12-16h at room temperature or 6-16h at high temperature, the electrolyte in the lithium battery is redistributed after vibration, and the electrolyte is further placed to fully soak the positive and negative pole pieces and the diaphragm.
As a preferred technical scheme of the invention, the temperature for placing the transfer box body and the lithium battery at high temperature is 30-55 ℃.
Compared with the prior art, the invention has the beneficial effects that:
(1) the soaking time of the electrolyte is favorably shortened, so that the free electrolyte is uniformly distributed, and the cycle life of the lithium battery at the later stage is favorably prolonged;
(2) through lithium battery vibration treatment, magazine particles and pole piece burrs introduced in the process of manufacturing the lithium battery can cause local micro short circuit, the self-discharge speed in the formation stage is accelerated, and the quick screening of the lithium battery which is unqualified in self-discharge is facilitated.
Drawings
FIG. 1 is a schematic structural view of the present invention;
in the figure: 1. a fixed seat; 2. a vibration motor; 3. a timer; 4. vibrating the tray; 5. a screw; 6. tightening the handle; 7. a round handle; 8. a rubber gasket; 9. a top cover; 10. a lithium battery transfer box body; 11. a switch and a frequency conversion knob; 12. a vibrating device.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic structural diagram of the present invention, a vibration device 12 includes a fixed seat 1, a vibration motor 2, a timer 3, a vibration tray 4, and a switch and frequency conversion knob 11, the timer 3, the switch and frequency conversion knob 11 are sequentially disposed from left to right on the front surface of the fixed seat 1, the vibration motor 2 is disposed inside the fixed seat 1, the vibration tray 4 is disposed on the top of the fixed seat 1, and screws 5 which are relatively distributed are fixed on the top end of the vibration tray 4; the rubber gasket is sleeved outside the top cover 9, a fastening handle 6 is fixed at the end part of the top cover 9, and a through hole capable of being inserted into the screw rod 5 is formed in the fastening handle 6; and the handle 7 is screwed with the screw 5.
Examples
Referring to fig. 1, the present invention provides a technical solution: an electrolyte infiltration method for a lithium battery comprises the following steps:
the selected type of the lithium battery is a soft package lithium battery, the capacity is 55Ah, the lithium battery belongs to a ternary composite lithium system, the number of the selected lithium batteries is 12, the 12 lithium batteries are neatly placed in a lithium battery transfer box body 10, then the lithium battery transfer box body is placed at normal temperature for 8h to enable the interior of the lithium battery to be fully soaked in the part (comprising a positive pole piece, a negative pole piece and a diaphragm) which is more in contact with electrolyte, then the lithium battery transfer box body 10 and the lithium battery are placed on a vibrating device 12 together, the lithium battery which is not injected with liquid is placed on the uppermost layer, the dislocation between the upper lithium battery and the lower lithium battery is adjusted to be less than 1mm, the lithium battery transfer box body 10 is placed on a vibrating tray 4, a top cover 9 sleeved with a rubber gasket 8 is taken up, a tightening handle 6 at the end part of the top cover 9 is inserted from the top of a screw rod 5, the rubber, and the vibration frequency is gradually increased to 3Hz from small to large by the vibration frequency adjusting knob, the vibration time is set to be 2min, after vibration, the lithium battery transfer box body 10 and the lithium battery are placed at room temperature for 12h, and then formation, capacity grading and cycle performance test of the lithium battery are carried out.
The formation conditions are as follows: and the initial charging multiplying power is 0.05C, the charging time is 30min, the voltage is cut off to 3.3V, then the charging multiplying power is increased to 0.1C, the charging time is 3h, the voltage is cut off to 3.7V, and the formation capacity of the lithium battery is recorded after the formation is finished.
The volume grading condition is as follows: the initial charging multiplying power is 0.33C, the charging mode is constant current and constant voltage, the charging time is 240min, the charging is stopped to be at the voltage of 4.3V, the current is stopped at 0.05C, the charging is stopped for 10min, then the constant current discharging is carried out, the discharging multiplying power is 0.33C, the discharging time is 200min, the discharging is stopped to be at the voltage of 2.8V, the charging is stopped for 10min, the circulation is carried out for 2 weeks according to the previous charging and discharging mode, after the circulation is finished, the charging is stopped to be at the voltage of 3.7V according to the charging multiplying power of 0.33C, the charging mode is constant current and constant voltage, the charging time is 200min, the charging is stopped to be at the voltage of 0.
The cycle life test conditions were: at room temperature, the lithium battery after capacity grading is discharged to 2.8V at constant current, the discharge rate is 1.OC, the lithium battery is placed for 10min, then the lithium battery is charged in a constant-current and constant-voltage mode, the charge rate is 1.0C, the charge is cut to 4.3V, the current is cut to 0.05C, the lithium battery is placed for 10min, then the lithium battery is discharged at constant current, the discharge rate is 0.33C, the discharge is cut to 2.8V, the lithium battery is placed for 10min … to carry out a cycle test according to the test method, the test is stopped when the capacity of the lithium battery is attenuated to 80% of the first-cycle discharge capacity, and the charge-discharge frequency represents the cycle life.
Comparative example
The selected lithium batteries are the same as those in the embodiment and belong to the same batch, the capacity of the lithium batteries is also 55Ah, the number of the selected lithium batteries is 12, the 12 lithium batteries are neatly placed in the transfer box body 10 of the lithium batteries, the lithium batteries are placed for 48h at normal temperature according to a conventional electrolyte infiltration method, then the formation operation of the lithium batteries can be started, and in the subsequent process, the method for capacity grading and the method for testing the cycle performance of the lithium batteries are the same as those in the embodiment.
Lithium battery performance test recording table
By comparing the data of the above examples and comparative examples, the total standing time of the electrolyte infiltration method in the examples is 20 hours, and the total standing time in the comparative examples is 48 hours, which indicates that the infiltration method can achieve the effect of rapid infiltration; after the lithium battery is stood still, the lithium battery is formed, the capacity of the capacity grading is consistent with that of the lithium battery formed by adopting a conventional infiltration method, and the capacity meets the requirement of the design of a battery core; in addition, according to the analysis of the cycle performance test result of the lithium battery, the cycle performance of the lithium battery is better on the whole by adopting the method of the invention, and the cycle life is prolonged by 4-6%.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. An electrolyte infiltration method for a lithium battery is characterized in that: the infiltration method comprises the following steps:
the method comprises the following steps: after the lithium battery liquid injection is finished, the lithium battery is loaded into a lithium battery transfer box body (10) and stands at normal temperature;
step two: placing the lithium battery transfer box body (10) which is placed at normal temperature in the first step on a vibration tray (4), taking up a top cover (9) sleeved with a rubber gasket (8), inserting a fastening handle (6) at the end part of the top cover (9) from the top of a screw rod (5), pressing the rubber gasket (8) on the top of the lithium battery transfer box body (10), taking up a round handle (7), and screwing the round handle (7) on the screw rod (5);
step three: the vibration equipment (12) is operated through a switch and a frequency conversion knob (11), so that the lithium battery transfer box body (10) vibrates on the vibration tray (4);
step four: and (3) placing the lithium battery transfer box body (10) and the lithium battery at normal temperature or placing the lithium battery in a high-temperature oven for high-temperature placement.
2. The electrolyte impregnation method for a lithium battery as claimed in claim 1, wherein: the lithium battery types include a flexible package lithium battery and a square lithium battery.
3. The electrolyte impregnation method for a lithium battery as claimed in claim 1, wherein: the lithium batteries are laid horizontally and placed in the lithium battery transfer box body (10), and the number of the lithium batteries in each lithium battery transfer box body (10) is less than or equal to 15.
4. The electrolyte impregnation method for a lithium battery as claimed in claim 1, wherein: and after liquid injection is finished, the lithium battery is kept stand for 8-12 h.
5. The electrolyte impregnation method for a lithium battery as claimed in claim 1, wherein: before the lithium battery transfer box body (10) and the lithium battery start to vibrate, a lithium battery (false battery cell) without liquid injection is placed between the lithium battery and a top cover (9) at the top end of the vibration equipment (12).
6. The electrolyte impregnation method for a lithium battery as claimed in claim 1, wherein: before the lithium battery transfer box body (10) and the lithium battery start to vibrate, the lithium batteries placed in the lithium battery transfer box body (10) are placed in order, and the dislocation range of the upper lithium battery and the lower lithium battery is 0-3 mm.
7. The electrolyte impregnation method for a lithium battery as claimed in claim 1, wherein: the vibration time of the transfer box body (10) of the lithium battery and the lithium battery is 1-10 min.
8. The electrolyte impregnation method for a lithium battery as claimed in claim 1, wherein: in the fourth step, the lithium battery transfer box body (10) and the lithium battery are placed for 12-16h at room temperature or 6-16h at high temperature.
9. The electrolyte impregnation method for a lithium battery as claimed in claim 8, wherein: the temperature for placing the lithium battery transfer box body (10) and the lithium battery at high temperature is 30-55 ℃.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910991811.5A CN110783631A (en) | 2019-10-18 | 2019-10-18 | Electrolyte infiltration method for lithium battery |
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| CN201910991811.5A CN110783631A (en) | 2019-10-18 | 2019-10-18 | Electrolyte infiltration method for lithium battery |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111403819A (en) * | 2020-05-06 | 2020-07-10 | 湖北亿纬动力有限公司 | Method for improving electrolyte infiltration of ternary battery and battery obtained by method |
| CN113245229A (en) * | 2021-04-14 | 2021-08-13 | 合肥国轩高科动力能源有限公司 | Method for screening lithium ion abnormal battery |
| CN113793943A (en) * | 2021-08-28 | 2021-12-14 | 徐宇航 | Anti-deformation and anti-bulging efficient infiltration device for electrolyte for lithium battery manufacturing |
| CN115020726A (en) * | 2022-07-07 | 2022-09-06 | 山东航盛新能源材料有限公司 | High-efficient infiltration device of electrolyte for lithium cell manufacturing |
-
2019
- 2019-10-18 CN CN201910991811.5A patent/CN110783631A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111403819A (en) * | 2020-05-06 | 2020-07-10 | 湖北亿纬动力有限公司 | Method for improving electrolyte infiltration of ternary battery and battery obtained by method |
| CN113245229A (en) * | 2021-04-14 | 2021-08-13 | 合肥国轩高科动力能源有限公司 | Method for screening lithium ion abnormal battery |
| CN113793943A (en) * | 2021-08-28 | 2021-12-14 | 徐宇航 | Anti-deformation and anti-bulging efficient infiltration device for electrolyte for lithium battery manufacturing |
| CN113793943B (en) * | 2021-08-28 | 2024-03-29 | 广东兆能科技有限公司 | Efficient electrolyte infiltration device for manufacturing lithium battery with deformation and bulge prevention |
| CN115020726A (en) * | 2022-07-07 | 2022-09-06 | 山东航盛新能源材料有限公司 | High-efficient infiltration device of electrolyte for lithium cell manufacturing |
| CN115020726B (en) * | 2022-07-07 | 2024-02-20 | 山东航盛新能源材料有限公司 | High-efficient infiltration device of electrolyte for lithium cell manufacturing |
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