CN110165318B - Pre-charging method for improving lithium separation - Google Patents
Pre-charging method for improving lithium separation Download PDFInfo
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- CN110165318B CN110165318B CN201910492099.4A CN201910492099A CN110165318B CN 110165318 B CN110165318 B CN 110165318B CN 201910492099 A CN201910492099 A CN 201910492099A CN 110165318 B CN110165318 B CN 110165318B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B11/00—Work holders not covered by any preceding group in the subclass, e.g. magnetic work holders, vacuum work holders
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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
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/446—Initial charging measures
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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 a pre-charging method for improving lithium separation, which comprises four steps, wherein the first step is to charge a battery with low current so as to form a solid electrolyte interface film on the surface of a battery core of the battery, the second step is to continuously charge the battery until the voltage of the battery reaches a preset voltage range, the current value of the current in the first step is smaller than that of the current in the second step, the third step is to continuously charge the battery until the voltage of the battery reaches the preset voltage range, the current value of the current in the second step is smaller than that of the current in the third step, and the constant voltage charging mode is adopted until the voltage of the battery reaches a charging cut-off current; the scheme firstly carries out pre-charging on the battery through a small current so as to form a solid electrolyte interface film on the battery core, and then carries out charging through a large-amplitude current step by step.
Description
Technical Field
The invention belongs to the field of lithium ion battery charging, and particularly relates to a pre-charging method for improving lithium separation.
Background
With the popularization of various mobile terminals, lithium ion batteries become mainstream power supply products due to the advantages of high energy density, high average output voltage and the like, the lithium ion batteries need to be subjected to a first-time charging pre-charging process before leaving factories, and in order to adapt to an increasingly explosive power market, many manufacturers shorten the production period, improve the productivity and intentionally reduce the pre-charging time of the lithium ion batteries, but the common method at present is to increase the pre-charging current.
Disclosure of Invention
The invention aims to provide a pre-charging method for improving lithium separation, which can greatly improve the problem of lithium separation, improve the safety performance of a battery cell and prolong the service life of the battery cell.
The purpose of the invention can be realized by the following technical scheme:
a method of pre-charging for improved lithium extraction, comprising:
placing a battery to be precharged on a bearing plate, controlling a motor to enable a movable plate to move towards the middle until a clamping plate clamps the battery, and charging the battery with a first current after clamping the battery to enable the surface of an electric core of the battery to form a solid electrolyte interface film;
step two, continuously charging the battery with a second current until the voltage of the battery reaches a preset voltage range;
the current value of the first current is smaller than that of the second current;
step three, continuously charging the battery with a third current until the voltage of the battery reaches a preset voltage range;
the current value of the second current is smaller than that of the third current;
and step four, charging with a constant voltage until the cutoff current is 0.02C.
Further, the step of charging the battery with the first current in the step one is specifically: and charging the battery by using the current with the amplitude of 0.05C for 30min, so that the voltage of the battery reaches 3.2V-3.3V.
Further, the step of continuously charging the battery with the second current in the second step until the voltage of the battery reaches the preset voltage range specifically includes: and charging the battery by using the current with the amplitude of 0.1-0.2C until the voltage of the battery reaches 3.5-3.7V.
Further, in the third step, the step of continuously charging the battery with the third current until the voltage of the battery reaches the preset voltage range specifically includes: and charging the battery by using the current with the amplitude of 0.3-0.5C until the voltage of the battery reaches 4.0-4.2V.
Further, the step four specifically comprises the following steps: and charging the battery at a constant voltage of 4.0-4.2V until the current of the battery reaches 0.02C.
Furthermore, the battery fixing device comprises a base and a fixing mechanism arranged on the base;
the base comprises a supporting bottom plate, a shaft lever is movably arranged at the center of the supporting bottom plate, and a worm wheel is fixed on the shaft lever; two vertical plates which are arranged oppositely are fixed on the upper surface of the supporting base plate, the two vertical plates are connected through a bearing plate, and a connecting rod is fixed on the outer side surfaces of the vertical plates; two pairs of first mounting plates which are oppositely arranged are fixed at the edge position of the upper surface of the supporting bottom plate, worms are movably mounted on the first mounting plates, the two worms are positioned at two sides of the bearing plate, and the worms are meshed with the worm wheels; the upper surface of the supporting bottom plate is also fixedly provided with two second mounting plates, the second mounting plates are positioned between the two first mounting plates at the same side, and the connecting rod is fixed on the second mounting plates;
the fixing mechanism comprises two oppositely arranged clamping devices, each clamping device comprises a movable plate, a first supporting plate and a second supporting plate are fixed on the lower surface of each movable plate, each first supporting plate is arranged on the worm, an internal thread hole is formed in the surface of each first supporting plate and is meshed with the worm, each second supporting plate is sleeved on the connecting rod, and each second supporting plate can slide along the connecting rod; the upper surface of the movable plate is fixed with a clamping plate, and the clamping plate is provided with heat dissipation holes which are uniformly distributed.
Furthermore, two the riser encloses into the structure of falling U-shaped with the loading board, and the loading board is used for placing the battery, and evenly distributed's louvre is opened on the surface of loading board.
Further, the first mounting plate is arranged in parallel to the vertical plate and located on the outer side of the vertical plate.
The invention has the beneficial effects that:
before the pre-charging, a battery to be pre-charged is placed on the battery supporting plate, the motor is controlled to enable the upper clamping plate to move downwards until the battery is clamped, and the subsequent pre-charging process is carried out after the battery is clamped; the battery fixing device is adopted to fix the battery, so that the battery can stably carry out the subsequent pre-charging process, the influence of the vibration of the battery on the pre-charging effect can be effectively avoided, meanwhile, the battery can be fixed and can also play a role in protecting the battery, and the bearing plate and the clamping plate are both provided with the heat dissipation holes which are uniformly distributed, so that good heat dissipation is realized on the basis of effectively protecting the battery, and the fixing device is simple and rapid in fixing mode and strong in operability;
in the first step of pre-charging, the battery is charged by using current with the amplitude of 0.05C, the charging time is 30min, and the voltage of the battery is raised to 3.2V-3.3V at the moment, so that a stable, uniform and compact solid electrolyte interface film can be formed on the surface of a battery cell in the process, the cycle performance of the battery is greatly improved, and the service life of the battery is greatly prolonged;
when the voltage of the battery is lower than 3.7V in the second pre-charging step, the process can further form a stable, uniform and compact solid electrolyte interface film on the surface of the battery cell, and the solid electrolyte interface film is generated in a multi-layer manner by increasing the current with the amplitude value, so that the stability and the uniformity of the solid electrolyte interface film of the battery cell can be greatly improved;
in the third step of the pre-charging, the pre-charging current is increased until the voltage of the battery reaches the charge cut-off voltage, the charge cut-off voltage is 4.2V, and the current speed can be controlled without worrying about lithium separation because the solid electrolyte interface film is finished in the charging process;
the battery is fixed by a special battery fixing device before pre-charging, then the battery is pre-charged by a four-step method, the battery is pre-charged by a small current, so that a solid electrolyte interface film is formed on the battery cell, and then the battery is charged by a large-amplitude current step by step.
Drawings
In order to facilitate understanding for those skilled in the art, the present invention will be further described with reference to the accompanying drawings.
FIG. 1 is a schematic structural view of a battery fixing device according to the present invention;
FIG. 2 is a schematic structural diagram of a base of the battery fixing device according to the present invention;
fig. 3 is a schematic structural view of a fixing mechanism of the battery fixing device of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood 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.
A pre-charging method for improving lithium separation comprises the steps of placing a battery to be pre-charged on a bearing plate 15, controlling a motor to enable a movable plate 21 to move towards the middle until a clamping plate 24 clamps the battery, wherein after the battery is clamped, the amplitude of a first current is 0.05C, C represents the battery capacity, and if the battery capacity C is 1000mAh, the charging current of 0.05C is 50 mA. The battery is charged by the current with the amplitude of 0.05C, the charging time is 30min, the voltage of the battery is raised to 3.2V-3.3V, a stable, uniform and compact solid electrolyte interface film can be formed on the surface of the battery cell in the process, the cycle performance of the battery is greatly improved, and the service life of the battery is greatly prolonged.
And step two, continuously charging the battery with a second current until the voltage of the battery reaches a preset voltage range, wherein the current value of the first current is smaller than that of the second step current. When the voltage of the battery is lower than 3.7V, the process can further enable the surface of the battery cell to form a stable, uniform and compact solid electrolyte interface film, and the solid electrolyte interface film is generated in a multi-layer mode by increasing the current with amplitude, so that the stability and uniformity of the solid electrolyte interface film of the battery cell can be greatly improved. Referring to fig. 1, the amplitude of the second current is 0.1C-0.2C, the preset voltage range is 3.5V-3.7V, and in the process, the multilayer perfection effect on the formation of the solid electrolyte interface film can be achieved, and the problem of lithium precipitation of the battery cell caused by polarization can be improved.
And step three, increasing the pre-charging current until the voltage of the battery reaches a charging cut-off voltage which is 4.2V, and controlling the current speed without worrying about lithium precipitation because the solid electrolyte interface film is finished in the charging process.
And step four, charging the battery with a constant voltage of 4.0-4.2V until the current of the battery reaches 0.02C.
Referring to fig. 1-3, a battery fixing device, as shown in fig. 1, includes a base 1 and a fixing mechanism 2 mounted on the base 1;
as shown in fig. 2, the base 1 includes a supporting base plate 11, a shaft 12 is movably mounted at a central position of the supporting base plate 11, a worm wheel 13 is fixed on the shaft 12, preferably, the shaft 12 is connected with a motor, and the motor drives the shaft 12 to rotate; the upper surface of the supporting bottom plate 11 is fixedly provided with two opposite vertical plates 14, the two vertical plates 14 are connected through a bearing plate 15, specifically, the two vertical plates 14 and the bearing plate 15 enclose an inverted U-shaped structure, the outer side surfaces of the vertical plates 14 are fixedly provided with connecting rods 16, the bearing plate 15 is used for placing batteries, and the surface of the bearing plate 15 is provided with heat dissipation holes which are uniformly distributed; two pairs of first mounting plates 17 which are arranged oppositely are fixed at the edge position of the upper surface of the supporting bottom plate 11, the first mounting plates 17 are arranged in parallel to the vertical plate 14 and are positioned at the outer side of the vertical plate 14, worms 18 are movably mounted on the first mounting plates 17, the two worms 18 are positioned at two sides of the bearing plate 15, and the worms 18 are meshed with the worm wheel 13; two second mounting plates 19 are further fixed on the upper surface of the supporting bottom plate 11, the second mounting plates 19 are located between the two first mounting plates 17 on the same side, and the connecting rod 16 is fixed on the second mounting plates 19;
as shown in fig. 3, the fixing mechanism 2 includes two clamping devices disposed oppositely, each clamping device includes a movable plate 21, a first support plate 22 and a second support plate 23 are fixed to a lower surface of the movable plate 21, the first support plate 22 is mounted on the worm 18, a surface of the first support plate 22 is provided with an internal threaded hole, the internal threaded hole is engaged with the worm 18, the second support plate 23 is sleeved on the connecting rod 16, and the second support plate 23 can slide along the connecting rod 16; a clamping plate 24 is fixed on the upper surface of the movable plate 21, and heat dissipation holes are uniformly distributed on the clamping plate 24;
the working principle and the mode of the battery fixing device are as follows:
starting a motor connected with a shaft lever 12, wherein the shaft lever 12 rotates to drive a worm wheel 13 to rotate, two worms 18 rotate through the meshing transmission of the worm wheel 13 and the worms 18, the worms 18 are meshed with internal thread holes 13 on the surface of a first supporting plate 22, and under the limiting action of a second supporting plate 23, the worm 18 rotates to drive two movable plates 21 to axially slide along the worms 18, and two clamping devices are oppositely arranged, so that the moving directions of the two movable plates 21 are opposite; when the battery pre-charging device is used, a battery to be pre-charged is placed on the bearing plate 15, the motor is controlled, the movable plate 21 moves towards the middle until the battery is clamped by the clamping plate 24, and a subsequent pre-charging process is performed after the battery is clamped; through adopting battery fixing device to fix the battery, make the battery stably carry out subsequent pre-charging process, can effectively avoid the vibrations of battery to the influence of pre-charging effect, simultaneously, it can also play the guard action to the battery to fix the battery, and all open evenly distributed's louvre on loading board 15 and splint 14, realize good heat dissipation on the basis of effectively protecting the battery to this fixing device realizes that fixed mode is simple, swift, and maneuverability is strong.
And (3) performance testing:
2 sample group experiment electricity cores, each 15 pieces of every group, use respectively after the dry storage to precharge with following process:
scheme 1: pre-charge for 30min with a current of amplitude 0.05C, pre-charge to 4.2V with a current of amplitude 0.5C, and finally charge to full with a current of amplitude 0.01C.
Scheme 2: pre-charging for 30min with the current with the amplitude of 0.05C, pre-charging to 3.5V with the current with the amplitude of 0.1C, pre-charging to 4.0V with the current with the amplitude of 0.5C, and charging to the constant voltage of 4.2V until the current is fully charged to 0.02C.
When the pre-charging of the two groups of experimental battery cores is counted after the pre-charging is finished, 5 battery cores are randomly dissected in the group corresponding to each scheme, and the lithium analysis condition of the 5 battery cores is observed and analyzed to obtain: the average charging time of the battery cell charged by the scheme 1 is approximately 275 min; the average charging time of the battery cells charged by the scheme 2 is about 230min, and the charging time of the scheme 2 is obviously reduced. And respectively randomly selecting 5 battery cells from the two groups of battery cells for dissection, and observing and comparing to find that the randomly selected two battery cells charged by the scheme 2 have uniform surface color and almost no silvery metallic lithium, and the randomly selected two battery cells charged by the scheme 1 have obvious silvery substance distribution on the surfaces, which is a lithium ion precipitation phenomenon.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (5)
1. A pre-charging method for improving lithium separation is characterized by comprising the following steps:
placing a battery to be precharged on a bearing plate (15) of a battery fixing device, controlling a motor to enable a movable plate (21) to move towards the middle until a clamping plate (24) clamps the battery, and charging the battery with a first current after clamping the battery to enable the surface of a battery core of the battery to form a solid electrolyte interface film;
the battery fixing device comprises a base (1) and a fixing mechanism (2) arranged on the base (1);
the base (1) comprises a supporting base plate (11), a shaft lever (12) is movably arranged at the center of the supporting base plate (11), and a worm wheel (13) is fixed on the shaft lever (12); the upper surface of the supporting bottom plate (11) is fixedly provided with two opposite vertical plates (14), the two vertical plates (14) are connected through a bearing plate (15), the two vertical plates (14) and the bearing plate (15) enclose an inverted U-shaped structure, the bearing plate (15) is used for placing batteries, heat dissipation holes are uniformly distributed in the surface of the bearing plate (15), and the outer side surfaces of the vertical plates (14) are fixedly provided with connecting rods (16); two pairs of first mounting plates (17) which are arranged oppositely are fixed at the edge position of the upper surface of the supporting base plate (11), the first mounting plates (17) are arranged in parallel to the vertical plate (14) and positioned on the outer side of the vertical plate (14), worms (18) are movably mounted on the first mounting plates (17), the two worms (18) are positioned on two sides of the bearing plate (15), and the worms (18) are meshed with the worm wheel (13); the upper surface of the supporting bottom plate (11) is also fixedly provided with two second mounting plates (19), the second mounting plates (19) are positioned between the two first mounting plates (17) on the same side, and the connecting rod (16) is fixed on the second mounting plates (19);
the fixing mechanism (2) comprises two clamping devices which are oppositely arranged, each clamping device comprises a movable plate (21), a first supporting plate (22) and a second supporting plate (23) are fixed on the lower surface of each movable plate (21), each first supporting plate (22) is installed on the worm (18), an internal threaded hole is formed in the surface of each first supporting plate (22), each internal threaded hole is meshed with the worm (18), each second supporting plate (23) is sleeved on the connecting rod (16), and each second supporting plate (23) can slide along the connecting rod (16); a clamping plate (24) is fixed on the upper surface of the movable plate (21), and heat dissipation holes are uniformly distributed on the clamping plate (24);
step two, continuously charging the battery with a second current until the voltage of the battery reaches a preset voltage range;
the current value of the first current is smaller than that of the second current;
step three, continuously charging the battery with a third current until the voltage of the battery reaches a preset voltage range;
the current value of the second current is smaller than that of the third current;
and step four, charging with a constant voltage until the cutoff current is 0.02C.
2. The pre-charging method for improving lithium extraction according to claim 1, wherein the step of charging the battery with the first current in the first step is specifically: and charging the battery by using the current with the amplitude of 0.05C for 30min, so that the voltage of the battery reaches 3.2V-3.3V.
3. The pre-charging method for improving lithium deposition as claimed in claim 1, wherein the step of continuing to charge the battery with the second current until the voltage of the battery reaches the predetermined voltage range in the second step includes: and charging the battery by using the current with the amplitude of 0.1-0.2C until the voltage of the battery reaches 3.5-3.7V.
4. The pre-charging method for improving lithium deposition as claimed in claim 1, wherein the step of continuing to charge the battery with the third current until the voltage of the battery reaches the predetermined voltage range in the third step is specifically: and charging the battery by using the current with the amplitude of 0.3-0.5C until the voltage of the battery reaches 4.0-4.2V.
5. The pre-charging method for improving lithium extraction according to claim 1, wherein the step four specifically comprises: and charging the battery at a constant voltage of 4.0-4.2V until the current of the battery reaches 0.02C.
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| CN105449286A (en) * | 2015-07-30 | 2016-03-30 | 万向A一二三系统有限公司 | Soft package lithium-ion battery activation method |
| CN106876813A (en) * | 2015-12-11 | 2017-06-20 | 深圳市比克动力电池有限公司 | A kind of method for pre-charging lithium ion batteries |
| CN107658515A (en) * | 2016-07-26 | 2018-02-02 | 深圳市比克动力电池有限公司 | Improve the method for pre-charging and system of analysis lithium |
| CN108023129A (en) * | 2016-10-30 | 2018-05-11 | 深圳格林德能源有限公司 | A kind of polymer Li-ion battery process for rapid activation |
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2019
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH08308123A (en) * | 1995-04-28 | 1996-11-22 | Sanyo Electric Co Ltd | Method for charging a plurality of lithium ion batteries |
| CN102299385A (en) * | 2011-07-29 | 2011-12-28 | 南京双登科技发展研究院有限公司 | Soft package lithium iron phosphate power battery initial charge formation method |
| CN105449286A (en) * | 2015-07-30 | 2016-03-30 | 万向A一二三系统有限公司 | Soft package lithium-ion battery activation method |
| CN106876813A (en) * | 2015-12-11 | 2017-06-20 | 深圳市比克动力电池有限公司 | A kind of method for pre-charging lithium ion batteries |
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Denomination of invention: A Precharge Method for Improving Lithium Evolution Effective date of registration: 20230704 Granted publication date: 20220218 Pledgee: Lujiang County small and medium-sized enterprises financing Company limited by guarantee Pledgor: HEFEI ZHONGHE POWER NEW ENERGY TECHNOLOGY Co.,Ltd. Registration number: Y2023980047313 |
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