CN110828903B - Battery core infiltration method of flexible package lithium ion battery - Google Patents

Battery core infiltration method of flexible package lithium ion battery Download PDF

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Publication number
CN110828903B
CN110828903B CN201911073973.7A CN201911073973A CN110828903B CN 110828903 B CN110828903 B CN 110828903B CN 201911073973 A CN201911073973 A CN 201911073973A CN 110828903 B CN110828903 B CN 110828903B
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rolling
battery
lithium ion
ion battery
package lithium
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CN110828903A (en
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赵晓伟
杨淑娟
国海鹏
武昆
宋昱科
高良秋
周宏�
李林茂
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Fengfan Co Ltd
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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
    • 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
    • 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
    • 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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  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Secondary Cells (AREA)
  • Primary Cells (AREA)

Abstract

A method for infiltrating a battery core of a flexible package lithium ion battery comprises the following steps: a. lithium battery filling: injecting 40% -60% electrolyte into the flexible package lithium ion battery according to the required liquid injection amount, and then carrying out vacuum liquid discharging; b. lithium battery refill liquid: injecting the rest electrolyte into the flexible package lithium ion battery according to the required liquid injection amount, and discharging in vacuum; c. packaging; d. extruding: performing physical extrusion on the flexible package lithium ion battery on an extrusion device; e. and (3) formation: after standing for 16h, the mixture was formed. The invention performs physical extrusion on the battery after liquid injection, so that the small gaps in the pole piece material can be filled with electrolyte quickly, and the active material can be fully immersed by the electrolyte in a short time. The method shortens the standing time from 24 hours to 16 hours in the current technology, and improves the consistency of the infiltration effect.

Description

Battery core infiltration method of flexible package lithium ion battery
Technical Field
The invention relates to a storage battery method, in particular to a method for infiltrating a battery core of a flexible package lithium ion battery, and belongs to the technical field of storage batteries.
Background
The lithium ion battery has the characteristics of high volume specific energy, high mass specific energy, long service life, repeated charging, no pollution and the like, and is widely used in a plurality of fields of digital products, automobile power batteries, energy storage power supplies and the like. The soft-package lithium ion battery adopts an aluminum plastic film, has higher energy density compared with a steel shell battery, is expanding the application range continuously, and is increasing in the field of power batteries for automobiles. The injection is one of the key procedures of the lithium ion battery, and the uniform infiltration of the electrolyte is important for the internal materials of the battery to perform normal chemical reaction. The electrolyte is fully infiltrated, so that the normal operation of the battery can be ensured, the effective formation of the battery is ensured, the normal formation of an SEI film is prevented from being influenced due to insufficient local infiltration, and the extreme condition of local lithium precipitation is avoided. The method of injecting liquid under vacuum and pressurizing and vacuumizing is the electrolyte infiltration method which is most applied by the battery manufacturer at present and is relatively efficient, but the method is only suitable for injecting liquid of the aluminum-shell battery supported by the hard shell. At present, the soft package battery liquid injection generally adopts a mode of normal pressure liquid injection and then vacuum liquid discharge, and the electrolyte between the pole pieces is soaked by long-time natural standing after liquid injection. However, for the lithium ion battery with high energy density, as the thickness of the active material of the pole piece is larger, the compaction density of the pole piece is higher, and the electrolyte injection amount is larger, so that the electrolyte is more difficult to infiltrate in a short time, and the electrolyte needs to infiltrate into the middle of the active material sufficiently, so that a higher requirement is placed on the electrolyte injection process.
Disclosure of Invention
The invention aims at overcoming the defects of the prior art and provides a cell infiltration method of a flexible package lithium ion battery, which can shorten the process time and improve the infiltration effect.
The invention is realized by the following technical scheme:
a method for infiltrating a battery core of a flexible package lithium ion battery comprises the following steps:
a. lithium battery filling: according to the required liquid injection amount, a liquid injection pump is regulated, 40% -60% of electrolyte is injected into the flexible package lithium ion battery, and then the liquid is discharged in vacuum;
b. lithium battery refill liquid: injecting the rest electrolyte into the flexible package lithium ion battery according to the required liquid injection amount, and discharging in vacuum;
c. packaging; packaging the lithium ion battery after liquid injection;
d. extruding: the flexible package lithium ion battery is physically extruded on the extrusion device, and in the physical extrusion process, the infiltrated battery core is subjected to intermittent external force pressurization, so that the infiltration process of electrolyte is accelerated, and the active material can be fully immersed by the electrolyte in a short time;
e. and (3) formation: after standing for 16h, the mixture was formed.
According to the method for infiltrating the battery core of the flexible package lithium ion battery, the time of the extrusion process is 20-40 minutes, and the pressurizing pressure is 0.1-0.2Mpa; the extrusion device comprises a pulse extrusion device and a rolling extrusion device, the flexible package lithium ion battery performs pulse extrusion on the pulse extrusion device, the time of each pressurization is 5-10s, and the time of each gap is 5-10s; the soft package lithium ion battery is intermittently rolled on a rolling extrusion device, wherein each rolling time is 5-10s, and the gap time is 10-15s.
According to the method for infiltrating the battery cells of the flexibly packaged lithium ion battery, the pulse extrusion device comprises a support frame, a battery frame and a pulse extrusion mechanism, wherein the battery frame is supported by the support frame and is provided with a first end plate, a second end plate and a plurality of battery clamping plates which are arranged between the two end plates side by side, each battery clamping plate is connected through a guide post, and the battery clamping plates are in sliding fit with the guide post; the pulse extrusion mechanism is provided with a clamping cylinder and a loosening cylinder, the clamping cylinder is fixed on the support frame, and a piston rod of the clamping cylinder is connected with the outer side of the first end plate; the loosening cylinder is fixed on the inner side of the second end plate, a piston rod of the loosening cylinder is connected with the first end plate, and the second end plate is fixed with the supporting frame.
According to the method for infiltrating the battery cells of the flexible package lithium ion battery, the reset spring is arranged between the adjacent battery clamping plates.
According to the method for infiltrating the battery cells of the flexible package lithium ion battery, four guide posts are arranged, and the four guide posts are respectively positioned at four corners of each battery clamping plate.
According to the battery core infiltration method of the flexible package lithium ion battery, the rolling extrusion device comprises a support, and a conveying mechanism and a rolling mechanism which are positioned on the support, wherein the conveying mechanism is provided with a lithium battery conveying belt driven by a conveying motor; the rolling mechanisms are sequentially arranged on the support, each rolling mechanism is provided with a rolling motor, a rubber roller, two slide rail seats and two pressing cylinders, the two slide rail seats are respectively and correspondingly fixed on two sides of the support, the slide rail seats are respectively provided with slide rails, the slide rails are respectively in sliding fit with the slide blocks, the rolling motor is arranged on one side of the slide block, the rolling motor is in transmission connection with one end of the rubber roller, the other end of the rubber roller is supported by the slide block, the pressing cylinders are fixed on the support, and piston rods of the pressing cylinders are respectively connected with the slide blocks.
According to the battery core infiltration method of the flexible package lithium ion battery, the lithium battery rolling positions are uniformly distributed on the lithium battery conveyor belt, and the lower part of the lithium battery conveyor belt is provided with the supporting roller.
According to the battery core infiltration method of the flexible package lithium ion battery, the rolling extrusion device is further provided with the proximity switch, and the proximity switch is positioned between the adjacent rolling mechanisms.
The method of the invention applies an external acting force in the process of impregnating the battery core of the flexible package lithium ion battery, namely, pulse extrusion or intermittent rolling is carried out on the battery after liquid injection by a corresponding device, under the action of external force pressurization, the impregnation process of the electrolyte is accelerated, and the active material can be fully impregnated with the electrolyte in a short time. The method can greatly shorten the infiltration time after liquid injection, shorten the standing time from 24 hours to 16 hours in the current process, and improve the consistency of infiltration effect.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of a pulse extrusion apparatus;
FIG. 2 is a schematic view of a structure of a rolling extrusion device;
FIG. 3 is a view in the A direction of FIG. 2;
FIG. 4 is a view in the B direction of FIG. 3;
FIG. 5 is a view in the direction C of FIG. 4;
fig. 6 is a comparative test diagram of voltage before formation of a flexible package lithium ion battery.
The reference numerals in the figures are: 1. the device comprises a first end plate, 2, a clamping cylinder, 3, a guide post, 4, a support frame, 5, a battery clamping plate, 6, a return spring, 7, a loosening cylinder, 8, a second end plate, 9, a support, 10, a lithium battery conveyor belt, 10-1, a lithium battery rolling position, 11, a proximity switch, 12, a conveying motor, 13, a rolling mechanism, 13-1, a sliding rail seat, 13-2, a sliding rail, 13-3, a sliding block, 13-4, a rolling motor, 13-5, a rubber roller, 13-6, a pressing cylinder, 14 and a supporting roller.
Detailed Description
The method comprises the following steps: a. lithium battery filling: according to the liquid injection amount required by the lithium battery, a liquid injection pump is regulated, 40% -60% of electrolyte is injected into the flexible package lithium ion battery, and then the liquid is discharged in vacuum. b. Lithium battery refill liquid: and (3) according to the required liquid injection amount, injecting the rest electrolyte into the flexible package lithium ion battery, and carrying out liquid vacuum. c. And packaging, namely packaging the lithium ion battery after liquid injection. d. Extruding: intermittent physical extrusion is carried out on the packaged flexible package lithium ion battery on the extrusion device, and in the physical extrusion process, the infiltrated battery core accelerates the infiltration process of electrolyte under the action of external force pressurization, so that the active material can be fully immersed by the electrolyte in a short time. e. And (3) formation: after standing for 16h, the mixture was formed. The invention adopts the physical extrusion step, thereby greatly reducing the working procedure time and improving the consistency of the infiltration effect. Good effect can be obtained through the extrusion process, and the extrusion process can be carried out for a plurality of times according to actual conditions. The time of each extrusion process is controlled to be 20-40 minutes, the pressurizing pressure is 0.1-0.2Mpa, and the single pressurizing time is 5-10s.
The physical extrusion process is carried out on an extrusion device, and the invention provides two extrusion devices, namely a pulse extrusion device and a rolling extrusion device.
Referring to fig. 1, the pulse pressing device refers to a pressing force applied to approximate a pulse signal. The pulse extrusion device comprises a supporting frame 4, a battery rack and a pulse extrusion mechanism. The battery rack is used for loading the flexibly packaged lithium ion batteries filled with the liquid side by side, and is supported by the supporting frame. The battery frame is provided with a first end plate 1, a second end plate 8 and a plurality of battery clamping plates 5 which are arranged between the two end plates side by side, each battery clamping plate is connected through guide posts 3, the four guide posts are arranged, the four guide posts are respectively positioned at four corners of each battery clamping plate, and the battery clamping plates are in sliding fit with the guide posts. Each flexible package lithium ion battery is respectively arranged between every two battery clamping plates. A reset spring 6 is arranged between the adjacent battery clamping plates, the reset spring is sleeved on the guide post, and two ends of the reset spring respectively touch the battery clamping plates on two sides. The pulse extrusion mechanism is provided with a clamping cylinder 2 and a loosening cylinder 7, the clamping cylinder is fixed on the supporting frame, and a piston rod of the clamping cylinder rod is connected with the first end plate. The loosening cylinder is fixed on the inner side of the second end plate, a piston rod of the loosening cylinder is connected with the first end plate, and the second end plate is fixed with the supporting frame. When the pulse extrusion device works, the piston rod of the clamping cylinder in the initial state is retracted, the distance between adjacent battery clamping plates is larger, and a plurality of flexible package lithium ion batteries are placed between the adjacent battery clamping plates; the piston rod of the clamping cylinder extends out, and the battery clamping plate clamps the flexible package lithium ion battery for 5-10s; the piston rod of the clamping cylinder is retracted, the piston rod of the loosening cylinder is extended, each battery clamping plate is reset, the clearance time is 5-10s, then the clamping is performed again, the actions are repeated, and the time is controlled to be 15-20 minutes.
Referring to fig. 2-5, the rolling extrusion device is used for intermittently rolling the flexible package lithium ion battery to achieve the effect of physical extrusion. The rolling time is 5-10s each time when rolling and extruding, and the clearance time is 10-15s. The rolling extrusion device comprises a support 9, a conveying mechanism and a rolling mechanism 13 which are positioned on the support. The conveying mechanism is used for conveying flexible package lithium ion batteries, the conveying mechanism is provided with a lithium battery conveying belt 10 driven by a conveying motor 12 and a corresponding transmission device, and lithium battery rolling positions 10-1 are uniformly distributed on the lithium battery conveying belt. A roller frame is arranged below the lithium battery conveyor belt, a supporting roller 14 for supporting the lithium battery conveyor belt is arranged on the roller frame, the supporting roller can rotate freely, and friction resistance can be reduced due to rolling friction between the supporting roller and the lithium battery conveyor belt. The rolling mechanisms are sequentially arranged on the support, and each rolling mechanism is provided with a rolling motor 13-4, a rubber roller 13-5, two sets of slide rail seats 13-1 and two pressing cylinders 13-6. Two sets of slide rail seats are respectively fixed on two sides of the support correspondingly, slide rails 13-2 are arranged on each slide rail seat, and each slide rail is respectively in sliding fit with the slide block 13-3. The rolling motor is arranged on the sliding block at one side, the rolling motor is in transmission connection with one end of the rubber roller, and the other end of the rubber roller is supported by the sliding block at the other side. The pressing cylinders are fixed on the support, and piston rods of the pressing cylinders are respectively connected with the sliding blocks. The rolling extrusion device is also provided with a proximity switch 11 which is positioned between adjacent rolling mechanisms.
When the rolling extrusion device works, the flexible package lithium ion battery is placed at a lithium battery rolling position of the lithium battery conveyor belt, when the flexible package lithium ion battery moves along with the lithium battery conveyor belt to approach a switch position, the proximity switch acts, two pressing cylinders of the rolling mechanism synchronously descend, the rubber rollers touch and press the flexible package lithium ion battery, meanwhile, the rolling motor rotates, the rubber rollers slowly move along with the conveyor belt to roll the flexible package lithium ion battery, the rolling motor stops rotating after the flexible package lithium ion battery leaves the rubber rollers, and then the two pressing cylinders synchronously lift. For a large batch of intermittent rolling processing flexible package lithium ion batteries, a progressive extrusion mode can be adopted, namely: and setting dozens of rolling mechanisms, repeatedly rolling the soft package lithium ions sequentially through the rolling mechanisms in the conveying process, wherein the process from one rolling mechanism to the next rolling mechanism is the gap time, and the conveying motor and the rolling motor are controlled to start and stop by using the control mechanism. For small batch intermittent rolling processing flexible package lithium ion batteries, a single extrusion mode can be adopted, namely: and a plurality of rolling mechanisms are arranged according to the requirement, and each flexible package lithium ion battery is respectively subjected to the rolling whole process in one rolling mechanism and then is uniformly output by a battery conveyor belt. The soft package lithium ion battery can be rolled intermittently through the forward rolling, the stop, the reverse rolling and the stop by the repeated forward rotation and the reverse rotation of the conveying motor and the rolling motor.
Two examples are provided below:
example 1: taking 50 soft-package lithium ion batteries 120161227, firstly injecting 70g of liquid into each lithium ion battery, and carrying out vacuum liquid-discharging (vacuum degree is 20%); injecting the secondary electrolyte into 70g of the residual electrolyte of the soft-package lithium ion battery, carrying out vacuum liquid discharging, packaging, and extruding the soft-package lithium ion battery on a rolling device for 40min under the extrusion pressure of 0.15Mpa for 5s and the gap time of 8s; standing for 16h, and forming according to a conventional forming method.
Example 2: taking 20 soft package lithium ion batteries 120161227, firstly injecting 80g of liquid into each lithium ion battery, carrying out vacuum liquid discharging (vacuum degree is 20%), injecting 60g of residual electrolyte into the soft package lithium ion batteries by secondary liquid injection, carrying out vacuum liquid discharging, packaging, and then extruding the soft package lithium ion batteries on a rolling extrusion device according to a single machine extrusion mode, wherein the extrusion time is 25min, the extrusion pressure is 0.2Mpa, the pressure duration is 10s, and the gap time is 10s; standing for 16h, and forming according to a conventional forming method.
The soft package lithium ion battery of the example and the soft package lithium ion battery infiltrated by the prior art are taken for detection, and the detection results are shown in table 1 and fig. 6.
TABLE 1
Method Average voltage/mv before formation Standard deviation of
The existing infiltration method is 24 hours 253.6 11.5
The existing infiltration method is 16h 227.8 12.9
Example 1 260.8 6.8
Example 2 262.6 8.3
The open circuit voltage after filling is an effective means for evaluating whether the battery electrolyte is wet or not, and as can be seen from table 1, the average open circuit voltage of the method of the invention is 7-9mv higher than that of the common method in a shorter time, and is more concentrated as shown in fig. 6. The battery cycle performance of the method is consistent with that of the conventional standing infiltration for 24 hours.

Claims (4)

1. The method for infiltrating the battery core of the flexible package lithium ion battery is characterized by comprising the following steps of:
a. lithium battery filling: according to the required liquid injection amount, a liquid injection pump is regulated, 40% -60% of electrolyte is injected into the flexible package lithium ion battery, and then the liquid is discharged in vacuum;
b. lithium battery refill liquid: injecting the rest electrolyte into the flexible package lithium ion battery according to the required liquid injection amount, and discharging in vacuum;
c. packaging; packaging the lithium ion battery after liquid injection;
d. extruding: the flexible package lithium ion battery is physically extruded on the extrusion device, and in the physical extrusion process, the infiltrated battery core is subjected to intermittent external force pressurization, so that the infiltration process of electrolyte is accelerated, and the active material can be fully immersed by the electrolyte in a short time;
e. and (3) formation: standing for 16h, and performing formation;
the extrusion device is a rolling extrusion device, and comprises a support (9), a conveying mechanism and a rolling mechanism (13), wherein the conveying mechanism is positioned on the support and is provided with a lithium battery conveying belt (10) driven by a conveying motor (12); the rolling mechanisms are sequentially arranged on the support, each rolling mechanism is provided with a rolling motor (13-4), a rubber roller (13-5), two slide rail seats (13-1) and two pressing cylinders (13-6), the two slide rail seats are respectively and correspondingly fixed on two sides of the support, each slide rail seat is provided with a slide rail (13-2), each slide rail is respectively in sliding fit with a slide block (13-3), the rolling motor is arranged on one side of the slide block, the rolling motor is in transmission connection with one end of the rubber roller, the other end of the rubber roller is supported by the slide block, each pressing cylinder is fixed on the support, and a piston rod of each pressing cylinder is respectively connected with each slide block;
when the rolling extrusion device works, a flexible package lithium ion battery which is intermittently rolled in batches is subjected to progressive extrusion, namely: setting tens of rolling mechanisms, repeatedly rolling the flexible package lithium ion battery sequentially through the rolling mechanisms in the conveying process, wherein the process from one rolling mechanism to the next rolling mechanism is a gap time, and the conveying motor and the starting and stopping of the rolling motor are controlled by using a control mechanism;
for the soft package lithium ion battery of small batch intermittent rolling processing, a single machine extrusion mode is adopted, namely: and a plurality of rolling mechanisms are arranged according to the requirement, and each flexible package lithium ion battery is respectively subjected to the rolling whole process in one rolling mechanism and then is uniformly output by a battery conveyor belt.
2. The method for impregnating the battery cells of the flexible-package lithium ion battery according to claim 1, wherein the method comprises the following steps: the physical extrusion process time is 20-40 minutes, and the pressurizing pressure is 0.1-0.2Mpa.
3. The method for impregnating the battery cells of the flexible-package lithium ion battery according to claim 1, wherein the method comprises the following steps: lithium battery rolling positions (10-1) are uniformly distributed on the lithium battery conveyor belt, and a supporting roller (14) is arranged at the lower part of the lithium battery conveyor belt.
4. The method for impregnating the battery cells of the flexible-package lithium ion battery according to claim 1, wherein the method comprises the following steps: the rolling extrusion device is also provided with a proximity switch (11), and the proximity switch is positioned between adjacent rolling mechanisms.
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CN112234256B (en) * 2020-03-27 2022-07-29 蜂巢能源科技有限公司 Battery infiltration device and infiltration method
CN111933993B (en) * 2020-08-21 2021-12-28 东莞市德瑞精密设备有限公司 Soft packet of power battery patting mechanism
CN113097666A (en) * 2020-08-27 2021-07-09 骆驼集团新能源电池有限公司 Liquid injection and standing process for soft package lithium ion battery
CN114803352B (en) * 2022-05-17 2024-03-26 东莞市超业精密设备有限公司 Battery infiltration circulation material taking and discharging equipment

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