CN107482272A - The measuring method of pressure between layers in lithium ion cell electrode group - Google Patents
The measuring method of pressure between layers in lithium ion cell electrode group Download PDFInfo
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- CN107482272A CN107482272A CN201710536433.2A CN201710536433A CN107482272A CN 107482272 A CN107482272 A CN 107482272A CN 201710536433 A CN201710536433 A CN 201710536433A CN 107482272 A CN107482272 A CN 107482272A
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- Prior art keywords
- pressure
- lithium ion
- ion cell
- layers
- battery
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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
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/488—Cells or batteries combined with indicating means for external visualization of the condition, e.g. by change of colour or of light density
-
- 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
-
- 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
- H01M10/448—End of discharge regulating measures
-
- 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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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Secondary Cells (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The present invention relates to a kind of measuring method of pressure between layers in lithium ion cell electrode group, it is characterized in that：It is packaged using impact paper and prepares pressure measurement film, pressure measurement film is pasted on the measurement pole piece position of battery, pole group is assembled using pole piece coiling or lamination process；Maximum Contact formula pressure measurement is carried out to the inside lithium ion cell after assembling, using pressure test after charging or the pressure test mode of external pressure.Beneficial effect：The present invention solves the problems, such as that inside battery footprint pressure can not direct measurement.The measurement data of pressure between layers is quick in this method lithium ion cell electrode group, it is desirable to which condition is simple, and process is simple, applied widely；Controllability is strong, can apply to the footprint pressure measurement of different arc ranges.
Description
Technical field
The invention belongs to field of lithium, more particularly to a kind of lithium ion battery made using winding or lamination process
The measuring method of pressure between layers in the group of pole.
Background technology
In recent years, the fast development in the field such as consumer electronics product, new-energy automobile and energy-storage system, to the energy content of battery
Density requirements more and more higher.Most directly it is also most on the premise of fixing chemical system to increase capacity in limited space
Fast mode is exactly to improve the compacted density of battery material to reach the small elevation of capacity.
Due to the compacted density increase of material, the expansion rate of material continues to increase in charge and discharge process so that battery interval
Pressure suffered by film increases, and the enhancing of tiny flaw damage capability, makes battery failure.In addition, due to expansive force in cylindrical battery
Directionality is more complicated so that collector is more easily broken off corresponding at lug, makes battery failure.
Pressure between layers in lithium ion cell electrode group are tested, the selection of battery component can be instructed, for battery component material
The regulation of (lug, collector, barrier film etc.) specifications parameter has obvious directive significance.In addition, for soft-package battery, test lithium from
Pressure between layers in sub- battery pole group, there is good directive significance to hot pressing, Backing and new fixture chemical synthesis technology.
Providing rational collector physical property just needs to battery the pressure to caused by collector in charging process
Provide specific numerical value.And it is external at present using the progress pole group internal pressure test of optical fiber manometric method, and this method needs
The equipment wanted is complicated, and cost is very high, and not easy to operate.The country is still without the survey of group internal pressure in pole in battery charging process
Amount method paper and patent.
The content of the invention
It is an object of the invention to overcome the shortcomings of above-mentioned technology, and provide pressure between layers in a kind of lithium ion cell electrode group
Measuring method, the measurement of battery charging process pole group internal pressure is carried out using impact paper pressure testing method, measurement data is quick,
Suitable for various model lithium ion batteries.
The present invention to achieve the above object, using following technical scheme：Pressure between layers in a kind of lithium ion cell electrode group
Measuring method, it is characterized in that：It is packaged using impact paper and prepares pressure measurement film, pressure measurement film is pasted to the survey of battery
Measure on pole piece position, pole group is assembled using pole piece coiling or lamination process；Inside lithium ion cell after assembling is carried out maximum
Contact pressure measurement, using pressure test after charging or the pressure test mode of external pressure；Comprise the following steps that：
(1) pressure test film is prepared：Impact paper is fixed on the PE films containing PUR, by PE films along pressure-sensitive trimming
Edge doubling, PE films are made to be bonded completely with impact paper；PE film edges after doubling carry out the thermoplastic processes of overall tightness, heat
It is 50-120 DEG C, pressure 0.1-0.5MPa, time 3-6S to mould technological temperature；
(2) the pressure test film of preparation is pasted into pole piece measurement position using Kapton Tape or poly- inclined fluorine divinyl glue
Put, then carry out the preparation of battery pole group and complete battery assembling；
(3) RGB and pressure relation criteria table are established：Color, which is provided, according to impact paper producer corresponds to pressure relation number
According to reading color rgb value, establish the criteria table of rgb value and pressure relation；
(4) after carrying out formation charging to the lithium ion battery of above-mentioned preparation, formation charging electric current is 0.1-1C, charge cutoff
Voltage is 4.2-4.35V, takes lithium ion battery in 10min apart, takes out pressure test film, reads the rgb value of pressure test film, with
Criteria table is contrasted, the pressure value after being measured.
The pressure test film specification：Length is 3-200mm, a width of 3-200mm, thickness 0.2-2mm.
The impact paper specification：Length is 1-197mm, a width of 1-197mm, thickness 0.1-1.8mm.Impact paper pressure is surveyed
Amount scope is 0.2-50MPa.
PUR on the PE films using ethane-acetic acid ethyenyl or vinyl acetate co-polymer glue or polyether sulfone glue or
Polyurethane adhesive glue or above-mentioned any two kinds and two or more combinations.
The pole piece measurement position that the pressure test film is pasted is the optional position on positive pole or cathode pole piece.
The formation charging electric current 1C is full capacity divided by the current value of 1 hour.
When the lithium ion battery is polymer battery, formation process needs to apply 0.1-10MPa pressure.
Beneficial effect：The present invention solves the problems, such as that inside battery footprint pressure can not direct measurement.This method lithium ion
The measurement data of pressure between layers is quick in battery pole group, it is desirable to which condition is simple, and process is simple, applied widely；Controllability
By force, the footprint pressure measurement of different arc ranges can be applied to.
Brief description of the drawings
Fig. 1 is the impact paper encapsulating structure schematic diagram prepared；
Fig. 2 is the cylindrical battery pole group coiling and molding schematic diagram of embodiment 1；
Fig. 3 is the form polymer battery polar group lamination shaping schematic view of embodiment 2.
In figure：1st, PE films, 2, dyed layer, 3, hot melt adhesive layer, 4, color layer, 5, pressure test film, 6, cylindrical pole group,
7th, laminated batteries pole group.
Embodiment
Describe the embodiment of the present invention in detail with reference to preferred embodiment.
Accompanying drawing is referred to, a kind of measuring method of pressure between layers in lithium ion cell electrode group is present embodiments provided, using pressure
Quick paper, which is packaged, prepares pressure measurement film, pressure measurement film is pasted on the measurement pole piece position of battery, using pole piece roll
Around or lamination process assembling pole group；Maximum Contact formula pressure measurement is carried out to the inside lithium ion cell after assembling, using charging
The pressure test mode of pressure test or external pressure afterwards；Comprise the following steps that：
(1) pressure test film is prepared：Impact paper is fixed on the PE films containing PUR, by PE films along pressure-sensitive trimming
Edge doubling, PE films are made to be bonded completely with impact paper；PE film edges after doubling carry out the thermoplastic processes of overall tightness, heat
It is 50-120 DEG C, pressure 0.1-0.5MPa, time 3-6S to mould technological temperature；The pressure test film specification：Length is 3-
200mm, a width of 3-200mm, thickness 0.2-2mm.The impact paper specification：Length is 1-197mm, a width of 1-197mm, thickness
For 0.1-1.8mm.Impact paper pressure measurement scope is 0.2-50MPa.PUR on PE films uses EVA ethylene-acetate second
Alkene or vinyl acetate co-polymer glue or PES polyether sulfones glue or TPU polyurethane adhesives glue or it is above-mentioned any two kinds and two kinds with
On combination.
(2) the pressure test film of preparation is pasted into pole piece measurement position using Kapton Tape or poly- inclined fluorine divinyl glue
Put, then carry out the preparation of battery pole group and complete battery assembling；
(3) RGB and pressure relation criteria table are established：Color, which is provided, according to impact paper producer corresponds to pressure relation number
According to reading color rgb value, establish the criteria table of rgb value and pressure relation；
(4) after carrying out formation charging to the lithium ion battery of above-mentioned preparation, formation charging electric current is 0.1-1C, charge cutoff
Voltage is 4.2-4.35V, takes lithium ion battery in 10min apart, takes out pressure test film, reads the rgb value of pressure test film, with
Criteria table is contrasted, the pressure value after being measured.The formation charging electric current 1C is full capacity divided by the electricity of 1 hour
Flow valuve.
The pole piece measurement position that the pressure test film is pasted is the optional position on positive pole or cathode pole piece.
When the lithium ion battery is polymer battery, formation process needs to apply 0.1-10MPa pressure.
Operation principle
The pressure test film of preparation, pressure sensitive is avoided directly to contact generation organic reaction, disturbed test knot with electrolyte
Fruit.In battery charging process, the change in volume can occur for positive and negative pole material, cause internal pressure to increase, while pressure passes
Lead on pressure sensitive, pressure is read by the RGB numerical value of pressure sensitive.
Embodiment 1
Refer to accompanying drawing 1-3, the measuring method of pressure between layers, step are as follows in a kind of lithium ion cell electrode group：
(1) as shown in figure 1, preparing pressure test film (specification is length × width x thickness=60mm × 20mm × 0.2mm)：By chi
The impact paper that very little specification is length × width x thickness=45mm × 5mm × 0.15mm is fixed in the PE films containing PUR, impact paper
Pressure test scope be 0.5 to arrive 50MPa, then make PE films and impact paper complete along pressure-sensitive paper edge doubling PE films
Fitting.Then thermoplastic is carried out to edge, parameter used in thermoplastic is 80 DEG C, pressure 0.3MPa, time 3s of temperature, is ensured overall close
Feng Xing.The pressure test film prepared using thermoplastic manner includes PE layers 1；Dyed layer 2；Hot melt adhesive layer 3 and color layer 4.
(2) as shown in Fig. 2 by the pressure test film 5 in Fig. 1, positive plate active matter is attached to by the way of adhesive tape glues and sticked
For matter from interior outward at 675mm, adhesive tape is not covered in pressure sensitive regions, and circular batteries pole group 6 is carried out after fixed and is wound.
(3) RGB and pressure relation criteria table are established：Color, which is provided, according to impact paper producer corresponds to pressure relation number
According to reading color rgb value, establish the criteria table of rgb value and pressure relation.
(4) the pole group wound is subsequently assembled.After being melted into given voltage, lithium ion battery is taken in 10min apart,
Pressure test film is taken out, the rgb value of pressure test film is read, is contrasted with criteria table, the pressure value after being measured.
By repeatedly measurement, 100%SOC inside battery footprint pressures value is 5.0MPa.
Embodiment 2
In a kind of laminated batteries charging process between pole piece pressure measuring method, step is as follows：
(1) prepare pressure test film (specification is length × width x thickness=60mm × 20mm × 0.2mm)：It is length by dimensions
× width x thickness=45mm × 5mm × 0.15mm impact paper is fixed in the PEPE films containing PUR, and the pressure of impact paper is surveyed
Examination scope is 0.5 to arrive 50MPa, then PE films is bonded completely with impact paper along pressure-sensitive paper edge doubling PE films.Then
Thermoplastic is carried out to edge, parameter used in thermoplastic is 80 DEG C of temperature, pressure 0.3MPa, time 3s, ensures overall sealing.
(2) as shown in figure 3, pressure test film to be attached to the position of the 5th layer of laminated batteries pole group 7 by the way of adhesive tape glues and sticked
Put, adhesive tape is not covered in pressure sensitive regions, and pole piece laminating is carried out after fixed.
(3) RGB and pressure relation criteria table are established：Color, which is provided, according to impact paper producer corresponds to pressure relation number
According to reading color rgb value, establish the criteria table of rgb value and pressure relation.
(4) the complete pole group of lamination is subsequently assembled.Formation charging is carried out in the frock that external pressure is 0.1MPa,
After being charged to given voltage.Take lithium ion battery in 10min apart, take out pressure test film, read the rgb value of pressure test film,
Contrasted with criteria table, the pressure value after being measured.By repeatedly measurement, 100%SOC inside battery footprint pressures
It is worth for 5.0MPa.
It is above-mentioned to be retouched in detail with reference to what embodiment was carried out to the measuring method of pressure between layers in a kind of lithium ion cell electrode group
State, be illustrative rather than limited, several embodiments can be included according to limited scope, therefore do not departing from this
Changing and modifications under invention general plotting, it should belong within protection scope of the present invention.
Claims (7)
1. the measuring method of pressure between layers in a kind of lithium ion cell electrode group, it is characterized in that：Preparation is packaged using impact paper
Pressure measurement film, pressure measurement film is pasted on the measurement pole piece position of battery, assembled using pole piece coiling or lamination process
Pole group；Maximum Contact formula pressure measurement is carried out to the inside lithium ion cell after assembling, using pressure test after charging or outside
The pressure test mode of pressure；Comprise the following steps that：
(1) pressure test film is prepared：Impact paper is fixed on the PE films containing PUR, by PE films along pressure-sensitive paper edge pair
Folding, makes PE films be bonded completely with impact paper；PE film edges after doubling carry out the thermoplastic processes of overall tightness, thermoplastic work
Skill temperature is 50-120 DEG C, pressure 0.1-0.5MPa, time 3-6S；
(2) the pressure test film of preparation is pasted into pole piece measurement position using Kapton Tape or poly- inclined fluorine divinyl glue
On, then carry out the preparation of battery pole group and complete battery assembling；
(3) RGB and pressure relation criteria table are established：Color is provided according to impact paper producer and corresponds to pressure relation data, is read
Color rgb value is taken, establishes the criteria table of rgb value and pressure relation；
(4) after carrying out formation charging to the lithium ion battery of above-mentioned preparation, formation charging electric current is 0.1-1C, charge cutoff voltage
For 4.2-4.35V, lithium ion battery is taken in 10min apart, take out pressure test film, the rgb value of pressure test film is read, with standard
Form is contrasted, the pressure value after being measured.
2. the measuring method of pressure between layers in lithium ion cell electrode group according to claim 1, it is characterized in that：The pressure
Test film specification：Length is 3-200mm, a width of 3-200mm, thickness 0.2-2mm.
3. the measuring method of pressure between layers in lithium ion cell electrode group according to claim 1, it is characterized in that：It is described pressure-sensitive
Lateral lattice：Length is 1-197mm, a width of 1-197mm, thickness 0.1-1.8mm.Impact paper pressure measurement scope is 0.2-
50MPa。
4. the measuring method of pressure between layers in lithium ion cell electrode group according to claim 1, it is characterized in that：The PE is thin
PUR on film using ethane-acetic acid ethyenyl or vinyl acetate co-polymer glue or polyether sulfone glue or polyurethane adhesive glue or
Above-mentioned any two kinds and two or more combinations.
5. the measuring method of pressure between layers in lithium ion cell electrode group according to claim 1, it is characterized in that：The pressure
The pole piece measurement position that test film is pasted is the optional position on positive pole or cathode pole piece.
6. the measuring method of pressure between layers in lithium ion cell electrode group according to claim 1, it is characterized in that：The chemical conversion
Charging current 1C is full capacity divided by the current value of 1 hour.
7. the measuring method of pressure between layers in lithium ion cell electrode group according to claim 1, it is characterized in that：The lithium from
When sub- battery is polymer battery, formation process needs to apply 0.1-10MPa pressure.
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| CN201710536433.2A CN107482272A (en) | 2017-07-04 | 2017-07-04 | The measuring method of pressure between layers in lithium ion cell electrode group |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110061269A (en) * | 2018-09-26 | 2019-07-26 | 南方科技大学 | Fuel cell pack internal current density and gas pressure intensity distributing on-line measurement device |
| CN110208711A (en) * | 2019-05-15 | 2019-09-06 | 天津力神电池股份有限公司 | Method for pole piece stress condition in on-line testing cylindrical battery charge and discharge process |
| CN112763110A (en) * | 2020-12-25 | 2021-05-07 | 常州福普生电子科技有限公司 | Electronic sensing paper and production method thereof |
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| CN110061269A (en) * | 2018-09-26 | 2019-07-26 | 南方科技大学 | Fuel cell pack internal current density and gas pressure intensity distributing on-line measurement device |
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Application publication date: 20171215 |