CN109974655A - A kind of apparatus and method for of online no pressure detection lithium battery silicon-carbon cathode pole piece expansion - Google Patents
A kind of apparatus and method for of online no pressure detection lithium battery silicon-carbon cathode pole piece expansion Download PDFInfo
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- CN109974655A CN109974655A CN201910145883.8A CN201910145883A CN109974655A CN 109974655 A CN109974655 A CN 109974655A CN 201910145883 A CN201910145883 A CN 201910145883A CN 109974655 A CN109974655 A CN 109974655A
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- silicon
- pole piece
- carbon
- lithium
- piece
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
- G01B21/08—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness for measuring thickness
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/32—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring the deformation in a solid
Abstract
The present invention provides a kind of apparatus and method fors of online no pressure detection lithium battery silicon-carbon cathode piece expansion, including sealed cabin device, pressure test and regulating device, thickness testing device, silicon-carbon pole piece charge and discharge device；The sealed cabin device is for ensuring that silicon-carbon pole piece is in the environment of anhydrous and oxygen-free；The pressure test and regulating device are used to detect silicon-carbon pole piece and expand the active force generated to anode lithium piece, and the spacing of lithium piece and silicon-carbon pole piece is adjusted by control device, guarantee that the active force between silicon-carbon pole piece and lithium piece is zero；What the thickness testing device was used to record lithium piece moves up distance, to calculate the expansion rate of silicon-carbon pole piece；The silicon-carbon pole piece charge and discharge device is used to carry out embedding lithium electric discharge to silicon-carbon pole piece, and swelling, service condition of the simulation silicon carbon material in battery occurs in pole piece.The method of the invention can accurate evaluation go out silicon-carbon pole piece expansion rate, can quickly filter out the lesser scheme of expansion rate, be of great practical significance.
Description
Technical field
The invention belongs to technical field of lithium batteries, detect lithium battery silicon-carbon cathode pole more particularly, to a kind of online no pressure
The apparatus and method for of piece expansion.
Background technique
The advantages that lithium ion battery is because of its energy density height, memory-less effect, good circulation conservation rate, is widely applied in recent years
In communication tool power supply, portable power tool equipment power supply and vehicle power power supply, in the market in electrical source of power field
Share increases year by year.The energy density of lithium ion battery is higher, and battery durable ability is better, and the ability for supplying electric power is stronger, answers
It is wider with range, so, the energy density for promoting lithium ion battery is the emphasis brainstorm subject of current academia and industry.
The specific capacity of positive and negative pole material has decisive impact the energy density of lithium ion battery, positive and negative pole material ratio
Capacity is higher, and the energy density of lithium ion battery is higher under the conditions of same design.Positive electrode current uses the nickel cobalt aluminium of height ratio capacity
Sour lithium metal oxide, negative electrode material use graphite-like Carbon anode or silicon-carbon cathode material, especially silicon-carbon cathode material, gram appearance
It measures up to 3000mAh/g or more, the energy density of current lithium ion battery can be improved 30-100% or more.However, silicon-carbon cathode
The embedding lithium expansion rate of material is too big, seriously hinders it in the application of field of lithium ion battery.It is small to filter out embedding lithium expansion rate
Silicon-carbon cathode scheme can accelerate application process of the silicon-carbon cathode material in lithium battery.
Field is evaluated and tested in lithium ion battery at present, main to the expansion of embedding lithium or using non-online mode, measurement indirectly
Method detects the expansion rate of silicon-carbon cathode pole piece, and uses miking pole piece thickness, can generate compression phenomena to pole piece,
Influence the expansion rate measurement accuracy of silicon-carbon pole piece.Measurement structure designed by the present invention and method, can be online and without effect
The embedding lithium expansion rate that silicon-carbon pole piece is measured under the mode of power, accelerates the screening of the silicon-carbon cathode material scheme of low thermal expansion, effectively
Corporation R & D and manufacturing cost are reduced, the economic benefit of enterprise is improved, improves the competitiveness of product in market.
Summary of the invention
In view of this, the present invention is directed to propose a kind of equipment of online no pressure detection lithium battery silicon-carbon cathode pole piece expansion
With method, to solve the case where lacking the online no pressure measuring device of effective silicon-carbon pole piece at present.
In order to achieve the above objectives, the technical scheme of the present invention is realized as follows:
A kind of equipment of online no pressure detection lithium battery silicon-carbon cathode pole piece expansion, including sealed cabin device, pressure test with
Regulating device, thickness testing device, silicon-carbon pole piece charge and discharge device；
The sealed cabin device is for ensuring that silicon-carbon pole piece is in the environment of anhydrous and oxygen-free；
The pressure test and regulating device be used to detect silicon-carbon pole piece and expand the active force generated to anode lithium piece, and passes through
The relative spacing for controlling device adjustment lithium piece and silicon-carbon pole piece guarantees that the active force between silicon-carbon pole piece and lithium piece is zero；
What the thickness testing device was used to record anode lithium piece moves up distance, to calculate the expansion rate of silicon-carbon pole piece；
The silicon-carbon pole piece charge and discharge device is used to carry out embedding lithium electric discharge to silicon-carbon pole piece, and swelling occurs in pole piece, simulates silicon
Service condition of the carbon material in battery in practice.
Further, the sealed cabin device is the stainless steel sealer that inside is coated with polypropylene material, polypropylene coating
Thickness is between 3-5mm, and there are pole piece plumb joint, sensor and extensometers to incude wire terminal for sealer upper cover, and accurate thread is close
Batten down.
Further, the pressure test and regulating device include that pressure sensor and lithium piece displacement adjust component.
Further, the thickness testing device moves up displacement using extensometer measurement lithium piece.
Further, further include silicon-carbon pole piece charge and discharge device, the silicon-carbon pole piece charge and discharge device be used for silicon-carbon into
The embedding lithium reaction of row.
A kind of method of online no pressure detection silicon-carbon cathode pole piece expansion, comprising:
S1, oxygen barrier water proof is carried out to the charge and discharge system that silicon-carbon pole piece, diaphragm, electrolyte and lithium piece form by sealed cabin device
Sealing；
S2, the power generated using pressure test and regulating device measurement silicon-carbon pole piece expansion；
S3, displacement of the thickness testing device measurement adjustment silicon-carbon pole piece stress for zero when, the anti-expansion for releasing silicon-carbon pole piece are used
Thickness；
S4, the lithium ion in lithium piece is embedded in silicon-carbon pole piece by silicon-carbon pole piece charge and discharge device, silicon-carbon pole piece occurs swollen
Swollen phenomenon.
Further, in the step S2, within the scope of the pressure measurement range 2N-500N of the pressure sensor, pressure
Adjusting the displacement adjustable range that screw thread drives lithium piece mobile is 0.001mm-5mm, precision 0.001mm, pressure measurement and pressure
It adjusts screw thread and uses closed circuit control, it is ensured that the active force of silicon-carbon pole piece suffered by lithium piece is zero.
Further, in the step S3, the thickness testing device, measurement accuracy 0.001mm, range 3.5mm.
Further, in the step S4, the silicon-carbon pole piece charge and discharge device, charging and discharging currents range is 0.002mA-
10mA, voltage range 0-5V.
Compared with the existing technology, the equipment of online no pressure detection lithium battery silicon-carbon cathode pole piece expansion of the present invention
It is had the advantage that with method
(1) apparatus and method for of online no pressure detection lithium battery silicon-carbon cathode pole piece expansion of the present invention can be real online
When monitor silicon-carbon pole piece embedding lithium degree and pole piece degrees of expansion correlation, convenient for filtering out the lesser silicon-carbon cathode material of expansion rate
Material scheme can significantly reduce Corporation R & D manufacturing cost, improve the economic benefit of enterprise, effectively improve product market competition
Power is conducive to widely apply in production, be of great practical significance.
(2) apparatus and method for of online no pressure detection lithium battery silicon-carbon cathode pole piece expansion of the present invention, is being surveyed
It is the state of not active force to pole piece when measuring silicon-carbon cathode expansion, when can avoid using miking thickness, measuring head pair
The compression phenomena that pole piece generates causes the situation of measurement inaccuracy, effectively improves measurement accuracy, shortens research and development progress and research and development
Investment improves the economic benefit of enterprise, improves the competitiveness of product in market.
Detailed description of the invention
It constitutes a part of attached drawing of the invention to be used to provide further understanding of the present invention, schematic figures of the invention
And its explanation is used to explain the present invention, and is not constituted improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is the equipment principle structure that a kind of online no pressure of the present invention detects the expansion of lithium battery silicon-carbon cathode pole piece
Figure.
Specific embodiment
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the present invention can phase
Mutually combination.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", "upper", "lower",
The orientation or positional relationship of the instructions such as "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside" is
It is based on the orientation or positional relationship shown in the drawings, is merely for convenience of description of the present invention and simplification of the description, rather than instruction or dark
Show that signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as pair
Limitation of the invention.In addition, term " first ", " second " etc. are used for description purposes only, it is not understood to indicate or imply phase
To importance or implicitly indicate the quantity of indicated technical characteristic.The feature for defining " first ", " second " etc. as a result, can
To explicitly or implicitly include one or more of the features.In the description of the present invention, unless otherwise indicated, " multiple "
It is meant that two or more.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood by concrete condition
Concrete meaning in the present invention.
It is next below with reference to the accompanying drawings that the present invention will be described in detail.
As shown in Figure 1, a kind of equipment of online no pressure detection lithium battery silicon-carbon cathode pole piece expansion, first uses sealed compartment
Silicon-carbon pole piece, diaphragm, electrolyte, lithium piece and pressure measurement to be measured and adjustment device, displacement measuring device are sealed, guaranteed
The anaerobic water-less environment of the embedding lithium of silicon-carbon, then adjusts cell pressure, makes its stress zero, and the extensometer of measurement displacement is read
Then number zero carries out embedding lithium reaction of discharging to silicon-carbon cathode pole piece, its volume of the process of the embedding lithium of silicon-carbon will do it expansion, in turn
It has certain effect power to sensor, by micro the risings lithium piece of dynamic and measuring system, guarantee silicon-carbon pole piece stress is zero, together
When elasticity modulus record rising displacement, and then calculate the embedding lithium expansion rate of silicon-carbon cathode.This method can be accurately online
Expansion rate of the silicon-carbon cathode in embedding lithium is measured, the manufacturing expense of product development and performance evaluation is reduced, improves enterprise's production
Benefit effectively improves product competitiveness in the market, is conducive to widely apply in production, anticipates with great production practices
Justice.
The sealed cabin device is the stainless steel sealer that inside is coated with polypropylene material, and polypropylene coating thickness is in 3-
Between 5mm, there are pole piece plumb joint, sensor and extensometers to incude wire terminal, accurate thread sealed compartment for sealer upper cover.
The pressure test and regulating device include that pressure sensor and lithium piece displacement adjust component.
The thickness testing device moves up displacement using extensometer measurement lithium piece.
It further include silicon-carbon pole piece charge and discharge device, the silicon-carbon pole piece charge and discharge device is used to carry out embedding lithium to silicon-carbon anti-
It answers.
A kind of method of online no pressure detection silicon-carbon cathode pole piece expansion, comprising:
S1, oxygen barrier water proof is carried out to the charge and discharge system that silicon-carbon pole piece, diaphragm, electrolyte and lithium piece form by sealed cabin device
Sealing；
S2, the power generated using pressure test and regulating device measurement silicon-carbon pole piece expansion；
S3, displacement of the thickness testing device measurement adjustment silicon-carbon pole piece stress for zero when, the anti-expansion for releasing silicon-carbon pole piece are used
Thickness；
S4, the lithium ion in lithium piece is embedded in silicon-carbon pole piece by silicon-carbon pole piece charge and discharge device, silicon-carbon pole piece occurs swollen
Swollen phenomenon.
In the step S2, within the scope of the pressure measurement range 2N-500N of the pressure sensor, pressure adjusts thread belt
The displacement adjustable range that lithium piece moves is moved as 0.001mm-5mm, precision 0.001mm, pressure measurement is adopted with pressure adjustment screw thread
With closed circuit control, it is ensured that the active force of silicon-carbon pole piece suffered by lithium piece is zero.
In the step S3, the thickness testing device, measurement accuracy 0.001mm, range 3.5mm.
Further, in the step S4, the silicon-carbon pole piece charge and discharge device, charging and discharging currents range is 0.002mA-
10mA, voltage range 0-5V.
The foregoing is merely of the invention to be further explained in detail, and is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (9)
1. a kind of equipment of online no pressure detection lithium battery silicon-carbon cathode pole piece expansion, it is characterised in that: filled including sealed compartment
It sets, pressure test and regulating device, thickness testing device, silicon-carbon pole piece charge and discharge device；
The sealed cabin device is for ensuring that silicon-carbon pole piece is in the environment of anhydrous and oxygen-free；
The pressure test and regulating device be used to detect silicon-carbon pole piece and expand the active force generated to anode lithium piece, and passes through
The relative spacing for controlling device adjustment lithium piece and silicon-carbon pole piece guarantees that the active force between silicon-carbon pole piece and lithium piece is zero；
What the thickness testing device was used to record anode lithium piece moves up distance, to calculate the expansion rate of silicon-carbon pole piece；
The silicon-carbon pole piece charge and discharge device is used to carry out embedding lithium electric discharge to silicon-carbon pole piece, and swelling occurs in pole piece, simulates silicon
Service condition of the carbon material in battery in practice.
2. the equipment of online no pressure detection silicon-carbon cathode pole piece expansion according to claim 1, it is characterised in that: described
Sealed cabin device is the stainless steel sealer that inside is coated with polypropylene material, and the polypropylene coating thickness is close between 3-5mm
Sealing device upper cover, there are pole piece plumb joint, sensor and extensometers to incude wire terminal, accurate thread sealed compartment.
3. the equipment of online no pressure detection silicon-carbon cathode pole piece expansion according to claim 1, it is characterised in that: described
Pressure test and regulating device include that pressure sensor and lithium piece displacement adjust component.
4. the equipment of online no pressure detection silicon-carbon cathode pole piece expansion according to claim 3, it is characterised in that: described
Thickness testing device moves up displacement using extensometer measurement lithium piece.
5. the equipment of online no pressure detection silicon-carbon cathode pole piece expansion according to claim 1, it is characterised in that: also wrap
Silicon-carbon pole piece charge and discharge device is included, the silicon-carbon pole piece charge and discharge device is used to carry out embedding lithium reaction to silicon-carbon.
6. a kind of method of online no pressure detection silicon-carbon cathode pole piece expansion characterized by comprising
S1, oxygen barrier water proof is carried out to the charge and discharge system that silicon-carbon pole piece, diaphragm, electrolyte and lithium piece form by sealed cabin device
Sealing；
S2, the power generated using pressure test and regulating device measurement silicon-carbon pole piece expansion；
S3, displacement of the thickness testing device measurement adjustment silicon-carbon pole piece stress for zero when, the anti-expansion for releasing silicon-carbon pole piece are used
Thickness；
S4, the lithium ion in lithium piece is embedded in silicon-carbon pole piece by silicon-carbon pole piece charge and discharge device, silicon-carbon pole piece occurs swollen
Swollen phenomenon.
7. the method for online no pressure detection silicon-carbon cathode pole piece expansion according to claim 6, it is characterised in that: described
In step S2, within the scope of the pressure measurement range 2N-500N of the pressure sensor, pressure adjusts screw thread and drives lithium piece movement
Displacement adjustable range is 0.001mm-5mm, precision 0.001mm, and pressure measurement and pressure adjustment screw thread use closed circuit control, really
The active force for protecting silicon-carbon pole piece suffered by lithium piece is zero.
8. the method for online no pressure detection silicon-carbon cathode pole piece expansion according to claim 6, it is characterised in that: described
In step S3, the thickness testing device, measurement accuracy 0.001mm, range 3.5mm.
9. the method for online no pressure detection silicon-carbon cathode pole piece expansion according to claim 6, it is characterised in that: described
In step S4, the silicon-carbon pole piece charge and discharge device, charging and discharging currents range is 0.002mA-10mA, voltage range 0-5V.
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| CN201910145883.8A CN109974655A (en) | 2019-02-27 | 2019-02-27 | A kind of apparatus and method for of online no pressure detection lithium battery silicon-carbon cathode pole piece expansion |
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| CN201910145883.8A CN109974655A (en) | 2019-02-27 | 2019-02-27 | A kind of apparatus and method for of online no pressure detection lithium battery silicon-carbon cathode pole piece expansion |
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Cited By (4)
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| CN111830416A (en) * | 2020-06-04 | 2020-10-27 | 扬州大学 | Device and method for in-situ detection of silicon cathode expansion and failure mechanism of lithium ion battery |
| CN111928805A (en) * | 2020-07-31 | 2020-11-13 | 中国科学院宁波材料技术与工程研究所 | Method for testing and analyzing expansion rate of silicon-based negative electrode material |
| CN113720232A (en) * | 2021-08-10 | 2021-11-30 | 合肥国轩高科动力能源有限公司 | Method for testing compression amount of lithium battery positive electrode sealing element |
| CN114279377A (en) * | 2021-12-08 | 2022-04-05 | 蜂巢能源科技股份有限公司 | Evaluation system and evaluation method for volume change of battery material in charging and discharging processes |
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Application publication date: 20190705 |