CN108172921A - The air-exhaust method of soft-package battery - Google Patents
The air-exhaust method of soft-package battery Download PDFInfo
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- CN108172921A CN108172921A CN201810097017.1A CN201810097017A CN108172921A CN 108172921 A CN108172921 A CN 108172921A CN 201810097017 A CN201810097017 A CN 201810097017A CN 108172921 A CN108172921 A CN 108172921A
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- battery
- concora crush
- air
- pumping
- soft
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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
- H01M10/52—Removing gases inside the secondary cell, e.g. by absorption
-
- 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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- Secondary Cells (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The present invention provides a kind of air-exhaust methods of soft-package battery, are related to the technical field of lithium ion battery manufacture process, include the following steps：First, prepare to be melted into terminate battery to be evacuated, the battery after chemical conversion is subjected to a concora crush；2nd, the battery after a concora crush carries out one and takes out an envelope；3rd, the battery after a pumping, carries out secondary concora crush；4th, the battery after secondary concora crush carries out two and takes out two envelopes, into subsequent processing；A concora crush mode is used before pumping by terminating battery in chemical conversion, apply certain external force to battery, positive and negative plate can be reduced in pumping process because pole piece expands, alleviate battery appearance after pumping in the prior art is bad, influence pumping after the completion of battery hardness it is unqualified, battery electrical property is influenced to play, and the technical issues of increasing manufacture cost, reducing the manufacture efficiency of battery；Maximizing removes battery core internal gas and excess electrolyte, maximized to ensure battery hardness and battery flatness.
Description
Technical field
The present invention relates to lithium ion battery manufacture process technical field, more particularly, to a kind of pumping side of soft-package battery
Method.
Background technology
Lithium ion battery (being claimed afterwards with lithium battery generation) has high voltage, high-energy density, high security, low self-discharge rate etc.
The advantages of, it is a kind of up-and-coming new energy；With the further development of science and technology, the day of energy problem and environmental problem
Benefit is prominent, and requirement of the people to lithium battery is higher and higher；In electric vehicle, solar energy storage battery, energy-accumulating power station, intelligent hand
The application fields such as machine, laptop computer, lithium battery is needed, which to have, forthright high power capacity, high power, high stability, high security and height
Consistency, the pumping process of Soft Roll liquid lithium ionic cell is the molding step finally encapsulated of battery.
It is directly to be taken out the battery after chemical conversion in the prior art for the pumping process of Soft Roll liquid lithium ionic cell
Gas so as to remove the gas inside battery core, seals battery core, also referred to as " envelope eventually "；Whether degassing effect is good, directly
Influence battery electrical property and battery appearance.
But due to being in the prior art directly to be taken out the battery after chemical conversion for Soft Roll liquid lithium ionic cell
Gas can cause battery appearance after being evacuated bad, and also result in battery pumping to have sordid phenomenon, so as to influence to be evacuated
Battery hardness is unqualified after the completion, and excess electrolyte can not be fully drawn out inside battery core, is contacted between pole piece not closely, influences battery
Electrical property plays；In addition, after the completion of pumping, for " soft " battery after the charged charge and discharge of partial volume, hardness is still unqualified, needs
Multiple charge and discharge are performed to consume inside battery excess electrolyte, so as to ensure battery hardness, considerably increase the system of battery
This is caused, and reduces the manufacture efficiency of battery.
Invention content
The purpose of the present invention is to provide a kind of air-exhaust method of soft-package battery, to alleviate pumping in the prior art
Battery hardness is unqualified after the completion of battery appearance is bad afterwards, influence is evacuated, and influences battery electrical property performance and increase to be manufactured into
Originally, the technical issues of reducing the manufacture efficiency of battery.
A kind of air-exhaust method of soft-package battery provided by the invention, includes the following steps：
First, prepare to be melted into terminate battery to be evacuated, the battery after chemical conversion is subjected to a concora crush；
2nd, the battery after a concora crush carries out one and takes out an envelope；
3rd, the battery after a pumping, carries out secondary concora crush；
4th, the battery after secondary concora crush carries out two and takes out two envelopes, into subsequent processing.
Further, step 1 includes the following steps：
The thickness of battery after step 101, detection chemical conversion, and the limit of the concora crush according to the thickness of battery setting flattening equipment
Position thickness；
Battery after chemical conversion is transmitted at the concora crush of flattening equipment by step 102, carries out a concora crush.
Further, the limiting thickness of flattening equipment is ranging from：It is melted into cell thickness ± 0.2mm.
Further, step 2 includes the following steps：
A pumping air-extractor is transmitted to after battery after step 201, a concora crush；
Step 202 is once vacuumized the battery after a concora crush, and along battery separate battery core one end into
One envelope of row.
Further, a pumping air-extractor is internally provided with idler wheel, to take out the preceding gas by inside battery one by idler wheel
Body is discharged.
Further, step 3 includes the following steps：
Step 301, the limiting thickness for lowering flattening equipment；
Battery after one one envelope of pumping is transmitted at flattening equipment by step 302, secondary concora crush is carried out, to limit electricity
The flatness in pond.
Further, flattening equipment is any of spreader bar or roll squeezer.
Further, step 4 includes the following steps：
Two pumping air-extractors are transmitted to after battery after step 401, secondary concora crush；
Step 402 is set as two envelope areas along the edge of the battery core of battery, battery is divided into battery core area by two envelope areas
With airbag area；
Step 403, the shearing by airbag area, and pumping and the encapsulation of two envelope zone positions are carried out at the same time, to limit battery core area
Air-tightness；
Step 404, the battery that two are honored as a queen are transmitted to subsequent processing.
Further, the two envelope areas that step 402 is set are taken out by the way that the battery after secondary concora crush is positioned over two pumpings
The groove of gas equipment forms two envelope areas along the edge of groove.
Further, multiple fixtures for fixing battery are provided in groove.
A kind of air-exhaust method of soft-package battery provided by the invention, includes the following steps：First, prepare to be melted into terminate to wait to take out
Battery after chemical conversion is carried out a concora crush by pneumoelectric pond；2nd, the battery after a concora crush carries out one and takes out an envelope；3rd, a pumping terminates
Battery afterwards carries out secondary concora crush；4th, the battery after secondary concora crush carries out two and takes out two envelopes, into subsequent processing；By being melted into
A concora crush mode is used before terminating the pumping of battery, battery is given to apply certain external force, positive and negative plate can be reduced and be evacuated
Because pole piece expands in journey, reducing leads to the difference in thickness of the aeration battery between pole piece deformation or pole piece, takes out and do not do
The phenomenon that net, occurs；Alleviate that battery appearance after pumping in the prior art is bad, influences battery hardness after the completion of pumping
It is unqualified, influence the technical issues of battery electrical property plays and increases manufacture cost, reduces the manufacture efficiency of battery；It realizes
After the completion of concora crush, pumping process is carried out again, and maximizing removes battery core internal gas and excess electrolyte, maximizes
Guarantee battery hardness and battery flatness so that the technique for making battery is more perfect.
Description of the drawings
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution of the prior art
Embodiment or attached drawing needed to be used in the description of the prior art are briefly described, it should be apparent that, in being described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, can also be obtained according to these attached drawings other attached drawings.
Fig. 1 is the integrated artistic flow chart of the air-exhaust method of soft-package battery provided in an embodiment of the present invention；
Fig. 2 is the structure diagram of the flattening equipment in the air-exhaust method of soft-package battery provided in an embodiment of the present invention；
Fig. 3 is the structure diagram of the air-extractor in the air-exhaust method of soft-package battery provided in an embodiment of the present invention；
Fig. 4 is the battery structure schematic diagram in the air-exhaust method of soft-package battery provided in an embodiment of the present invention.
Icon：100- flattening equipments；200- air-extractors；210- grooves；Mono- envelope areas of 300-；Bis- envelope areas of 400-；500- electricity
Core area；600- airbags area.
Specific embodiment
Technical scheme of the present invention is clearly and completely described below in conjunction with attached drawing, it is clear that described implementation
Example is part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill
Personnel's all other embodiments obtained without making creative work, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that such as occur term " " center ", " on ", " under ", "left", "right",
" vertical ", " level ", " interior ", " outer " etc., indicated by orientation or position relationship be based on orientation shown in the drawings or position
Relationship is for only for ease of the description present invention and simplifies description rather than instruction or imply that signified device or element must have
There is specific orientation, with specific azimuth configuration and operation, therefore be not considered as limiting the invention.In addition, as occurred
Term " first ", " second ", " third " are only used for description purpose, and it is not intended that instruction or hint relative importance.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " peace such as occur
Dress ", " connected ", " connection " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected or integrally
Connection；Can be mechanical connection or electrical connection；It can be directly connected, can also be indirectly connected by intermediary,
It can be the connection inside two elements.For the ordinary skill in the art, can above-mentioned art be understood with concrete condition
The concrete meaning of language in the present invention.
Fig. 1 is the integrated artistic flow chart of the air-exhaust method of soft-package battery provided in this embodiment.
Fig. 2 is the structure diagram of the flattening equipment 100 in the air-exhaust method of soft-package battery provided in this embodiment；Its
In, a concora crush and secondary concora crush can be carried out for battery by flattening equipment 100.
Fig. 3 is the structure diagram of the air-extractor in the air-exhaust method of soft-package battery provided in this embodiment；Wherein, it takes out
Gas equipment 200 is internally provided with a pumping air-extractor 200 and two and takes out air-extractor 200, and two pumping air-extractors 200 are internally provided with
Groove 210.
Fig. 4 is the battery structure schematic diagram in the air-exhaust method of soft-package battery provided in this embodiment.Wherein, two envelope area
Battery is divided into battery core area 500 and airbag area 600 by 400.
As shown in Figs 1-4, the air-exhaust method of a kind of soft-package battery provided in this embodiment, includes the following steps：First, prepare
It has been melted into and has terminated battery to be evacuated, the battery after chemical conversion is subjected to a concora crush；2nd, the battery after a concora crush carries out one and takes out one
Envelope；3rd, the battery after a pumping, carries out secondary concora crush；4th, the battery after secondary concora crush carries out two and takes out two envelopes, and entrance is next
Process.
Detailed process, one takes out an envelope takes out air-extractor 200 using one, and two take out two envelopes takes out air-extractor 200 using two, and
One takes out the pumping air-extractor 200 of air-extractor 200 and two can be in same housing；Concora crush and secondary concora crush are using pressure
Flat equipment 100, flattening equipment 100 could be provided as one, and carrying out a concora crush by flattening equipment 100 later transmits battery
To housing, take out air-extractor 200 by one and carry out one envelope of pumping, soft-package battery is formed into hermetic bag body, then will be after sealing
Battery be delivered to flattening equipment 100 and carry out secondary concora crush, battery is back in housing after concora crush, two is carried out and takes out two envelopes, from
And complete the pumping process of soft-package battery.
In addition, flattening equipment 100 may be set to be two, a pumping air-extractor 200 and two is taken out air-extractor 200 and is also set
It it is two, two flattening equipments 100 and one take out the pumping of air-extractor 200 and two and are respectively separated setting, intermediate to be filled by transmitting
It puts and is transmitted connection, a pumping air-extractor 200 is delivered to by transmitting device after the flattening equipment 100 of a concora crush
It carries out one and takes out an envelope, battery is conveyed to the flattening equipment 100 of only secondary concora crush after a pumping, it finally will be after secondary concora crush
Battery carry out two and take out two envelopes, complete the pumping process of soft-package battery, the above process is suitble to high-volume, pipelining, can be with
Preferably improve efficiency.
A kind of air-exhaust method of soft-package battery provided in this embodiment, includes the following steps：First, preparation has been melted into end and has treated
Battery is evacuated, the battery after chemical conversion is subjected to a concora crush；2nd, the battery after a concora crush carries out one and takes out an envelope；3rd, one knot is taken out
Battery after beam carries out secondary concora crush；4th, the battery after secondary concora crush carries out two and takes out two envelopes, into subsequent processing；By changing
Using a concora crush mode before into the pumping for terminating battery, apply certain external force to battery, positive and negative plate can be reduced and be evacuated
In the process because pole piece expands, reducing leads to the difference in thickness of the aeration battery between pole piece deformation or pole piece, takes out not
The phenomenon that clean, occurs；Alleviate battery appearance after pumping in the prior art is bad, influence pumping after the completion of battery it is hard
It spends unqualified, influences battery electrical property and play and increase manufacture cost, the technical issues of reducing the manufacture efficiency of battery；It is real
After the completion of having showed a concora crush, pumping process is carried out again, maximizing removes battery core internal gas and excess electrolyte, maximum
The guarantee battery hardness of change and battery flatness so that the technique for making battery is more perfect.
On the basis of above-described embodiment, further, a kind of air-exhaust method of soft-package battery provided in this embodiment, step
Rapid one includes the following steps：The thickness of battery after step 101, detection chemical conversion, and flattening equipment is set according to the thickness of battery
The limiting thickness of 100 concora crush；Battery after chemical conversion is transmitted at the concora crush of flattening equipment 100 by step 102, is carried out primary
Concora crush.
Further, the limiting thickness of flattening equipment 100 is ranging from：It is melted into cell thickness ± 0.2mm.
Wherein, since the soft-package battery of each model has specific thicknesses range, by by the concora crush of flattening equipment 100
Limiting thickness is set as referring specifically to so that flattening equipment 100 can make gas and excess electrolyte in battery core in the first step, discharge
Between battery core pole piece, increase by one and take out effect；So as to when carrying out secondary concora crush, fully can completely squeeze out inside battery gas
And excess electrolyte, ensure battery hardness.
Further, step 2 includes the following steps：A pumping is transmitted to after battery after step 201, a concora crush
Air-extractor 200；Step 202 is once vacuumized the battery after a concora crush, and along the one end of battery far from battery core
Carry out an envelope.
Wherein, battery core places the position with the side inside battery pack, and opposite side is discharge gas and flows out extra electrolysis
Battery pack can be first in an environment sealed by the airbag area 600 of liquid by being carried out in an envelope area 300 after an envelope
In.
In addition, carry out an envelope before battery pack completely into act charitably closedtop and side seal the step of, battery pack only has at this time
One end open.
Further, a pumping air-extractor 200 is internally provided with idler wheel, preceding by inside battery to be smoked by idler wheel one
Gas is discharged.
Wherein, idler wheel can be provided with multiple, and multiple idler wheels synchronize pumping and extruding along the surface of battery pack
Process preferably discharges inside battery excessive gas during being evacuated.
Further, step 3 includes the following steps：Step 301, the limiting thickness for lowering flattening equipment 100；Step
302nd, the battery after taking out an envelope by one is transmitted at flattening equipment 100, secondary concora crush is carried out, to limit the smooth of battery
Degree.
Wherein, the limiting thickness of flattening equipment 100 at this time is less than the thickness of soft-package battery, so as to the pressure of secondary concora crush
Flat equipment 100 removes battery core internal gas and excess electrolyte, maximized to ensure battery hardness and battery flatness.
Further, flattening equipment 100 is any of spreader bar or roll squeezer.
Specifically, spreader bar uses hydraulic press, and hydraulic press is a kind of to process metal, plastics, rubber using hydrostatic pressure
The machinery of the products such as glue, timber, powder, for pressing process and block pressing forming process.
Roll squeezer is designed according to bed-grinding principle, is mainly characterized by：High pressure, full gear, full material, material bed powder
It is broken.The squeeze roller group that roll squeezer is rotated synchronously in opposite directions by two is into one is fixing roller, and one is movable roll, and material is from two rollers
Top is fed, and is squeezed between pressure roller continuous band enters roller, improves the grindability of material.
As shown in figure 4, further, step 4 includes the following steps：After battery after step 401, secondary concora crush
It is transmitted to two pumping air-extractors 200；Step 402 is set as two envelope areas 400 along the edge of the battery core of battery, to pass through two envelopes
Battery is divided into battery core area 500 and airbag area 600 by area 400；Step 403, the shearing by airbag area 600, and it is carried out at the same time pumping
The encapsulation of 400 position of He Erfeng areas, to limit the air-tightness in battery core area 500；Step 404, the battery that two are honored as a queen are transmitted to down
One process.
Wherein, during two envelopes, first choice is punctured airbag by chopper, is vacuumized simultaneously, the small portion of gas and one in such airbag
Divide electrolyte that will be extracted.Then two envelope end sockets are packaged in two envelope areas 400, ensure that the air-tightness of battery core, finally handle
The battery encapsulated cuts off airbag, a soft-package battery basic forming；Two envelopes are the last one packaging process of soft-package battery.
Further, the two envelope areas 400 that step 402 is set are by the way that the battery after secondary concora crush is positioned over two pumpings
The groove 210 of air-extractor 200 forms two envelope areas 400 along the edge of groove 210.
Further, multiple fixtures for fixing battery are provided in groove 210.
Wherein, the quantity of fixture can be two, four, six etc., preferably, the quantity of fixture is four.
Specifically, battery is pre-fixed by four, by upper low head, and end socket is closed with certain temperature
It is pressed in when holding together on the aluminum plastic film outside battery, the PP layers of aluminum plastic film are bonded together by fusing.
The air-exhaust method of soft-package battery provided in this embodiment, by having carried out the process of a concora crush, tool before being taken out one
Body gives battery application certain external force by the way that the limiting thickness of the flattening equipment 100 of a concora crush is set to carry out a concora crush, and one
Secondary concora crush (roll-in) can reduce positive and negative plate in pumping process because pole piece expands, and reduce between pole piece deformation or pole piece
The difference in thickness of aeration battery takes out sordid phenomenon generation；An envelope is taken out finally by one, secondary concora crush and two takes out two envelopes
The step of pumping process is carried out for battery, maximizing removes battery core internal gas and excess electrolyte, maximized to ensure
Battery hardness and battery flatness.
Finally it should be noted that：The above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe is described in detail the present invention with reference to foregoing embodiments, it will be understood by those of ordinary skill in the art that：Its according to
Can so modify to the technical solution recorded in foregoing embodiments either to which part or all technical features into
Row equivalent replacement；And these modifications or replacement, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (10)
1. a kind of air-exhaust method of soft-package battery, which is characterized in that include the following steps：
First, prepare to be melted into terminate battery to be evacuated, the battery after chemical conversion is subjected to a concora crush；
2nd, the battery after a concora crush carries out one and takes out an envelope；
3rd, the battery after a pumping, carries out secondary concora crush；
4th, the battery after secondary concora crush carries out two and takes out two envelopes, into subsequent processing.
2. the air-exhaust method of soft-package battery according to claim 1, which is characterized in that step 1 includes the following steps：
The thickness of battery after step 101, detection chemical conversion, and it is thick according to the limiting of the concora crush of the thickness of battery setting flattening equipment
Degree；
Battery after chemical conversion is transmitted at the concora crush of flattening equipment by step 102, carries out a concora crush.
3. the air-exhaust method of soft-package battery according to claim 2, which is characterized in that the limiting thickness of the flattening equipment
Ranging from：It is melted into cell thickness ± 0.2mm.
4. the air-exhaust method of soft-package battery according to claim 2, which is characterized in that step 2 includes the following steps：
A pumping air-extractor is transmitted to after battery after step 201, a concora crush；
Step 202 is once vacuumized the battery after a concora crush, and carries out one along one end of the separate battery core of battery
Envelope.
5. the air-exhaust method of soft-package battery according to claim 4, which is characterized in that set inside the pumping air-extractor
Idler wheel is equipped with, is discharged with taking out the preceding gas by inside battery one by the idler wheel.
6. the air-exhaust method of soft-package battery according to claim 4, which is characterized in that step 3 includes the following steps：
Step 301, the limiting thickness for lowering flattening equipment；
Battery after one one envelope of pumping is transmitted at flattening equipment by step 302, secondary concora crush is carried out, to limit battery
Flatness.
7. the air-exhaust method of soft-package battery according to claim 6, which is characterized in that the flattening equipment for spreader bar or
Person's roll squeezer it is any.
8. the air-exhaust method of soft-package battery according to claim 6, which is characterized in that step 4 includes the following steps：
Two pumping air-extractors are transmitted to after battery after step 401, secondary concora crush；
Step 402 is set as two envelope areas along the edge of the battery core of battery, gentle battery is divided into battery core area by two envelope areas
Bag area；
Step 403, the shearing by airbag area, and pumping and the encapsulation of two envelope zone positions are carried out at the same time, to limit the gas in battery core area
Close property；
Step 404, the battery that two are honored as a queen are transmitted to subsequent processing.
9. the air-exhaust method of soft-package battery according to claim 8, which is characterized in that two envelope Qu Shitong described in step 402
The groove that the battery after secondary concora crush is positioned over to two pumping air-extractors is crossed, described two are formed along the edge of the groove
Seal area.
10. the air-exhaust method of soft-package battery according to claim 9, which is characterized in that be provided with and be used in the groove
Multiple fixtures of fixed battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810097017.1A CN108172921B (en) | 2018-01-31 | 2018-01-31 | Air extraction method of soft package battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810097017.1A CN108172921B (en) | 2018-01-31 | 2018-01-31 | Air extraction method of soft package battery |
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| CN108172921B CN108172921B (en) | 2020-11-24 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110048168A (en) * | 2019-04-19 | 2019-07-23 | 浙江锋锂新能源科技有限公司 | A kind of cold-press process mixing solid-liquid electrolyte lithium battery |
| CN112072181A (en) * | 2020-08-20 | 2020-12-11 | 湖南立方新能源科技有限责任公司 | Air extraction secondary sealing method for soft-packaged battery cell |
| CN112259936A (en) * | 2020-08-28 | 2021-01-22 | 苏州新中能源科技有限公司 | Liquid supplementing and repairing method for soft package lithium ion battery |
| CN112366357A (en) * | 2020-07-31 | 2021-02-12 | 万向一二三股份公司 | Rolling degassing method for soft package lithium battery |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110048168A (en) * | 2019-04-19 | 2019-07-23 | 浙江锋锂新能源科技有限公司 | A kind of cold-press process mixing solid-liquid electrolyte lithium battery |
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| CN112366357A (en) * | 2020-07-31 | 2021-02-12 | 万向一二三股份公司 | Rolling degassing method for soft package lithium battery |
| CN112072181A (en) * | 2020-08-20 | 2020-12-11 | 湖南立方新能源科技有限责任公司 | Air extraction secondary sealing method for soft-packaged battery cell |
| CN112259936A (en) * | 2020-08-28 | 2021-01-22 | 苏州新中能源科技有限公司 | Liquid supplementing and repairing method for soft package lithium ion battery |
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|---|---|
| CN108172921B (en) | 2020-11-24 |
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