CN112259936A - Liquid supplementing and repairing method for soft package lithium ion battery - Google Patents
Liquid supplementing and repairing method for soft package lithium ion battery Download PDFInfo
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- CN112259936A CN112259936A CN202010887351.4A CN202010887351A CN112259936A CN 112259936 A CN112259936 A CN 112259936A CN 202010887351 A CN202010887351 A CN 202010887351A CN 112259936 A CN112259936 A CN 112259936A
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- lithium ion
- ion battery
- soft package
- package lithium
- glue
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 64
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 64
- 239000007788 liquid Substances 0.000 title claims abstract description 49
- 230000001502 supplementing effect Effects 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000007789 sealing Methods 0.000 claims abstract description 56
- 239000003292 glue Substances 0.000 claims abstract description 35
- 239000012530 fluid Substances 0.000 claims abstract description 13
- 239000000565 sealant Substances 0.000 claims abstract description 13
- 238000001802 infusion Methods 0.000 claims abstract description 12
- 238000000605 extraction Methods 0.000 claims abstract description 9
- 239000002985 plastic film Substances 0.000 claims abstract description 9
- 229920006255 plastic film Polymers 0.000 claims abstract description 9
- 239000003792 electrolyte Substances 0.000 claims abstract description 8
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 5
- 238000007872 degassing Methods 0.000 claims abstract description 5
- 239000012943 hotmelt Substances 0.000 claims abstract description 5
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 5
- 239000010703 silicon Substances 0.000 claims abstract description 5
- 239000003973 paint Substances 0.000 claims abstract description 4
- 238000012216 screening Methods 0.000 claims abstract description 4
- 238000004806 packaging method and process Methods 0.000 claims description 9
- 238000003825 pressing Methods 0.000 claims description 8
- 238000013461 design Methods 0.000 claims description 5
- 238000001125 extrusion Methods 0.000 claims description 4
- 238000003860 storage Methods 0.000 claims description 3
- 238000004064 recycling Methods 0.000 abstract description 3
- 239000005038 ethylene vinyl acetate Substances 0.000 description 11
- DQXBYHZEEUGOBF-UHFFFAOYSA-N but-3-enoic acid;ethene Chemical compound C=C.OC(=O)CC=C DQXBYHZEEUGOBF-UHFFFAOYSA-N 0.000 description 10
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 10
- 230000000694 effects Effects 0.000 description 6
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 5
- 239000004809 Teflon Substances 0.000 description 5
- 229920006362 Teflon® Polymers 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000004146 energy storage Methods 0.000 description 5
- 238000002637 fluid replacement therapy Methods 0.000 description 5
- 239000005011 phenolic resin Substances 0.000 description 5
- 229920001568 phenolic resin Polymers 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 239000006260 foam Substances 0.000 description 3
- 238000003475 lamination Methods 0.000 description 3
- 230000014759 maintenance of location Effects 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
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Classifications
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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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- 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)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The invention relates to a liquid supplementing and repairing method for a soft package lithium ion battery, which comprises the following steps: s1, a battery screening step, namely, selecting soft package lithium ion batteries with good appearance and good voltage and internal resistance within the process range and without damage leakage for later use; s2, a liquid supplementing step, namely, piercing a layer of aluminum-plastic film in the area between the top seal and the laminated body to form a liquid supplementing hole, and slowly injecting electrolyte; s3, a degassing step, namely standing the liquid-supplemented soft package lithium ion battery for 15-30min, and then carrying out air extraction treatment on the soft package lithium ion battery; s4, sealing, namely sealing by adopting a glue sealing mode or a heat sealing mode, wherein the glue sealing mode is to quickly glue and seal the fluid infusion hole by adopting hot-melt EVA glue, then paint and cover the EVA glue by adopting organic silicon sealant, and carry out secondary glue sealing, and the heat sealing mode is to carry out heat sealing treatment on the fluid infusion hole by adopting a heat sealing end socket. The problem of repairing and recycling soft package lithium ion batteries with gas produced in retired service can be effectively solved.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a liquid supplementing and repairing method for a soft package lithium ion battery.
Background
Along with the national vigorous popularization of new energy automobiles, the demand of lithium ion batteries is greatly increased in the large environment of strengthening and developing base station energy storage, industrial and commercial energy storage, large, medium and small UPS, power grid side energy storage and user side energy storage. The goods output of the power lithium ion battery for the automobile in 19 years is increased by 15.4 percent compared with the goods output of the power lithium ion battery in the last year, and the goods output of the lithium ion battery for energy storage is increased by 22.9 percent. Correspondingly, the performance of the lithium ion battery is reduced due to the problems of expired service life, improper use environment and conditions, BMS design defects and the like, the quantity of the lithium ion battery to be recycled is gradually increased, and the defective battery of the gas generation bulge is higher in percentage. Aiming at the reutilization of the gas-producing bulge battery, the method is favorable for the sustainable development of resources and environment on the one hand, and reduces the enterprise cost on the other hand.
At present, some enterprises pre-arrange an exhaust gas and liquid supplementing pipe made of PP materials in a soft package lithium ion battery in the battery production stage, the method is difficult to implement and operate, a liquid supplementing pipe groove needs to be pre-punched on an aluminum plastic film, and the phenomenon of liquid leakage is easy to occur due to the poor packaging of the aluminum plastic film and the liquid supplementing pipe; if the sealing is carried out, the liquid supplementing pipe of the battery is difficult to act when the air is exhausted and the liquid is supplemented in the later period, and the requirement on packaging equipment is high. Meanwhile, when the battery is assembled, the soft package lithium ion battery with the liquid supplementing pipe increases the requirements on the structural design of the module and the production cost.
Disclosure of Invention
The invention aims to provide a liquid supplementing and repairing method for a soft package lithium ion battery, and solves the problem of how to repair a battery without an embedded exhaust liquid supplementing pipe.
In order to achieve the purpose, the invention adopts the technical scheme that:
the invention provides a liquid supplementing and repairing method for a soft package lithium ion battery, which comprises the following steps:
s1, a battery screening step, namely, selecting soft package lithium ion batteries with good appearance and good voltage and internal resistance within the process range and without damage leakage for later use;
s2, a liquid supplementing step, namely, piercing a layer of aluminum-plastic film in the area between the top seal and the laminated body to form a liquid supplementing hole, and slowly injecting electrolyte;
s3, a degassing step, namely standing the liquid-supplemented soft package lithium ion battery for 15-30min, and then carrying out air extraction treatment on the soft package lithium ion battery;
s4, sealing, namely sealing by adopting a glue sealing mode or a heat sealing mode, wherein the glue sealing mode is to quickly glue and seal the fluid infusion hole by adopting hot-melt EVA glue, then paint and cover the EVA glue by adopting organic silicon sealant, and carry out secondary glue sealing, and the heat sealing mode is to carry out heat sealing treatment on the fluid infusion hole by adopting a heat sealing end socket.
Preferably, the degassing step of S3 further includes flattening the lithium ion battery.
Further, the cold pressing is carried out under a condition of flattening set to a pressure of 0.1MPa to 0.6 MPa.
Preferably, a flattening machine is used for flattening, and an insulating layer is arranged at the contact part of the flattening machine and the lithium ion battery.
Preferably, the flattening is performed by a flattening machine, on which an extrusion strip is provided, the extrusion strip corresponding to the area between the top seal and the lamination stack.
Preferably, an air extraction device is adopted for air extraction treatment, and the air extraction device comprises an air extraction cylinder connected with a vacuum pump, a liquid storage tank and a vacuum degree gauge.
Preferably, the packaging condition in the heat sealing mode is 170-190 ℃ for 2-5 s.
Preferably, the thickness of the coated EVA glue is 1.5mm-2.5mm, the thickness of the coated organosilicon sealant is 1.0mm-1.5mm, and the total thickness of the EVA glue and the organosilicon sealant is not more than half of the design value of the thickness of the soft package battery.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:
according to the liquid supplementing and repairing method for the soft package lithium ion battery, a layer of aluminum-plastic film is punctured in the area between the top seal and the laminated body, so that a liquid supplementing hole is formed, electrolyte is injected and gas is removed through the liquid supplementing hole, two sealants with different characteristics are adopted to be matched for use, the liquid supplementing hole is sealed, or the liquid supplementing hole is sealed through heat sealing, the two sealing methods are simple and convenient to operate, high in production efficiency and obvious in effect, and the problem of repairing and recycling the soft package lithium ion battery with gas generated in retirement can be effectively solved.
Drawings
Some specific embodiments of the invention will be described in detail hereinafter, by way of illustration and not limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:
FIG. 1 is a schematic diagram of a soft-pack lithium ion battery fluid replacement repair method according to a preferred embodiment of the present invention;
fig. 2 is a schematic structural diagram of a soft-package lithium ion battery with tabs on two sides;
fig. 3 is a schematic structural diagram of a soft-package lithium ion battery with tabs discharged from the same side;
FIG. 4 is a schematic diagram of a soft package lithium ion battery fixed on a lower pressing plate of a flatting machine;
FIG. 5 is a schematic diagram of the heat sealing of the fluid infusion hole of a soft package lithium ion battery;
FIG. 6 is a graph of cycle performance for a soft pack lithium ion battery with and without repair;
wherein the reference numerals are as follows:
1. soft packaging of the lithium ion battery; 11. a fluid replenishing hole; 12. the area between the top seal and the lamination stack; 13. a tab;
2. flattening machine; 21. a lower pressing plate; 22. a phenolic resin platform adhered with teflon; 23. high-hardness foam; 24. positioning a baffle plate; 25. an upper pressure plate;
3. and (6) heat-sealing the end socket.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. 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.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1
As shown in fig. 1, the liquid replenishing and repairing method for the soft package lithium ion battery of the invention comprises the following steps:
s1, a battery screening step, namely, selecting soft package lithium ion batteries with good appearance and good voltage and internal resistance within the process range and without damage leakage for later use;
s2, a liquid supplementing step, namely, piercing a layer of aluminum-plastic film at the position between the top seal and the laminated body to form a liquid supplementing hole, and slowly injecting electrolyte;
s3, a degassing step, namely standing the liquid-supplemented soft package lithium ion battery for 15-30min, and then carrying out air extraction treatment on the soft package lithium ion battery;
and S4, sealing, namely sealing by adopting a glue sealing mode, wherein the glue sealing mode is to firstly adopt hot-melt EVA glue to quickly glue and seal the fluid infusion hole, then adopt organic silicon sealant to paint and cover the EVA glue, and carry out secondary glue coating and sealing.
As shown in fig. 2, the soft-package lithium ion battery 1 is a soft-package lithium ion battery with tabs at two sides. The holes 11 for fluid infusion are formed by piercing an aluminum plastic film with a needle in the area 12 between the top seal and the laminate. The specific needle inserting position is 15-17mm away from the edge of the side seal and 2-3mm away from the edge of the top seal. Then 15ml-20ml of electrolyte is slowly injected into the liquid supplementing hole 11 through a syringe. In order to prevent moisture from entering the battery, the operation is carried out in an injection room with the dew point lower than minus 45 ℃.
As shown in fig. 3, the soft-package lithium ion battery 1 is a soft-package lithium ion battery with a single-side tab. The needle area is in the area 12 between the top seal and the lamination stack. Particularly, the distance between the center positions of two tabs 13 and the top seal edge is 2-3 mm.
And (4) standing the soft package lithium ion battery for 15-30min after the liquid is supplemented, so that the pole piece is soaked by the electrolyte. And then carrying out air extraction treatment on the soft package lithium ion battery. Evacuation is also performed using the fluid infusion port 11. And an air extractor is adopted for extracting air. The air extractor comprises an air extracting cylinder, the air extracting cylinder is in sealed butt joint with the liquid supplementing hole 11 through a sealing ring, and the air extracting cylinder is connected with a vacuum pump, a liquid storage tank and a vacuum degree meter. And pumping air for 5-15s when the vacuum of the vacuum gauge reaches a set value.
In order to better expel the gas, the soft package lithium ion battery 1 is also flattened in this example. The flattening is performed by a flattening machine 2, as shown in fig. 4. Flatting mill 2 includes top board 25 and holding down plate 21, and top board 25 and holding down plate 21 still are provided with the phenolic resin platform 22 that pastes the teflon in the face of soft packet of lithium ion battery 1, and phenolic resin produces insulating effect, and insulating properties is further strengthened to the attached teflon, and the phenolic resin platform 22 that pastes the teflon can be regarded as the insulating layer. The teflon-coated phenolic resin platform 22 is also provided with an extrusion strip, namely high-hardness foam 23, and the high-hardness foam 23 corresponds to the region 12 between the battery top seal and the laminated body, so that gas in the region is extruded more fully. And a positioning baffle 24 is arranged on the upper pressing plate 25 or the lower pressing plate 21 to position the soft package lithium ion battery 1.
Setting the pressure of a flatting machine to be 0.1-0.6 MPa, and carrying out cold pressing.
And finally, performing S4 sealing, wherein the sealing adopts hot-melt ethylene-vinyl acetate (EVA) glue to perform quick glue coating and sealing on the liquid supplementing hole 11, and after the glue is solidified, the upper pressing plate 25 of the flattening machine 2 can be lifted. And uniformly coating and covering the EVA glue of the liquid supplementing hole 11 by adopting organic silicon sealant, and performing secondary gluing and sealing. The thickness of the coated EVA glue is 1.5-2.5mm, the thickness of the coated organosilicon sealant is 1.0-1.5mm, and the total thickness of the EVA glue and the organosilicon sealant is not more than half of the design value of the thickness of the soft package battery. The EVA adhesive has high curing speed, resists electrolyte corrosion and can achieve the effect of quick packaging; the organosilicon sealant has strong viscosity, is soft and elastic after being cured, has strong bonding force with the aluminum-plastic film, and does not fall off. The two kinds of glue are matched for use to achieve the best packaging effect.
Example 2
The difference between this example and embodiment 1 is step S4, and this example S4 is:
and S4, sealing, namely sealing by adopting a heat sealing mode, wherein the heat sealing mode is to carry out heat sealing treatment on the liquid supplementing hole by adopting a heat sealing end socket.
Namely, the difference is that the fluid infusion hole 11 is sealed by heat sealing.
Referring to fig. 5, the fluid-replenishing hole 11 is heat-sealed with a heat-sealing cap 3 having a length and a width of 7mm and 5 mm. The packaging condition is 170 ℃ and 190 ℃ for heat sealing for 2-5 s. After the heat sealing, the upper pressure plate 25 of the flatting machine 2 can be lifted.
Packaging position: and the soft-packaged lithium ion battery with the lugs at two sides is packaged at a position 12-13mm away from the side seal and 0.0-1.0mm away from the edge of the top seal, and completely covers the liquid replenishing hole 11. And the soft-packaged lithium ion battery with the lugs on the same side is packaged at the central position between the lugs of the two poles, is 0.0-1.0mm away from the edge of the top seal and completely covers the liquid replenishing hole 11.
The two sealing methods in the embodiment 1 and the embodiment 2 can realize quick sealing, are simple and convenient to operate, high in production efficiency and obvious in effect, and can effectively solve the problem of repairing and recycling the gas-generating and swelling retired soft package lithium ion battery.
The implementation effect of the invention is as follows: and comparing the normal-temperature 1C cycle data of the gas-generating ballooning retired soft package lithium ion battery repaired by liquid supplementing and not repaired by liquid supplementing. See table one below and fig. 6.
It can be seen from table one that after fluid replacement repair, the initial capacity of the battery is improved, the normal temperature cycle life of the battery is significantly improved, and when the cycle is up to 300 times, the discharge capacity of the battery repaired by fluid replacement is 89.52% higher than the retention rate of the initial discharge capacity, while the retention rate of the discharge capacity of the battery not repaired by fluid replacement is only 42.02%, and the discharge capacity of the ex-service battery which is not repaired by fluid replacement and is inflated by gas is attenuated very quickly. When the soft package lithium ion battery after fluid infusion and repair is circulated for 500 times, the retention rate of the discharge capacity of the soft package lithium ion battery is still 79.61 percent.
The above embodiments are merely illustrative of the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the content of the present invention and implement the invention, and not to limit the scope of the invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered by the scope of the present invention.
Claims (8)
1. A liquid supplementing and repairing method for a soft package lithium ion battery comprises the following steps:
s1, a battery screening step, namely, selecting soft package lithium ion batteries with good appearance and good voltage and internal resistance within the process range and without damage leakage for later use;
s2, a liquid supplementing step, namely, piercing a layer of aluminum-plastic film in the area between the top seal and the laminated body to form a liquid supplementing hole, and slowly injecting electrolyte;
s3, a degassing step, namely standing the liquid-supplemented soft package lithium ion battery for 15-30min, and then carrying out air extraction treatment on the soft package lithium ion battery;
s4, sealing, namely sealing by adopting a glue sealing mode or a heat sealing mode, wherein the glue sealing mode is to quickly glue and seal the fluid infusion hole by adopting hot-melt EVA glue, then paint and cover the EVA glue by adopting organic silicon sealant, and carry out secondary glue sealing, and the heat sealing mode is to carry out heat sealing treatment on the fluid infusion hole by adopting a heat sealing end socket.
2. The liquid replenishing and repairing method for the soft package lithium ion battery according to claim 1, characterized in that: the step of removing the gas of S3 further comprises flattening the lithium ion battery.
3. The liquid replenishing and repairing method for the soft package lithium ion battery according to claim 2, characterized in that: the cold pressing is carried out under the condition of flattening by setting the pressure of 0.1MPa-0.6 MPa.
4. The liquid replenishing and repairing method for the soft package lithium ion battery according to claim 1, characterized in that: and flattening by using a flattening machine, wherein an insulating layer is arranged at the contact part of the flattening machine and the lithium ion battery.
5. The liquid replenishing and repairing method for the soft package lithium ion battery according to claim 1, characterized in that: and flattening by adopting a flattening machine, wherein an extrusion strip is arranged on the flattening machine and corresponds to an area between the top seal and the laminated body.
6. The liquid replenishing and repairing method for the soft package lithium ion battery according to claim 1, characterized in that: the air extracting device is used for air extracting treatment and comprises an air extracting cylinder connected with a vacuum pump, a liquid storage tank and a vacuum degree gauge.
7. The liquid replenishing and repairing method for the soft package lithium ion battery according to claim 1, characterized in that: the packaging condition in the heat sealing mode is 170-190 ℃ for 2-5 s.
8. The liquid replenishing and repairing method for the soft package lithium ion battery according to claim 1, characterized in that: the thickness of the coated EVA glue is 1.5mm-2.5mm, the thickness of the coated organosilicon sealant is 1.0mm-1.5mm, and the total thickness of the EVA glue and the organosilicon sealant is not more than half of the design value of the thickness of the soft package battery.
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| CN202010887351.4A CN112259936A (en) | 2020-08-28 | 2020-08-28 | Liquid supplementing and repairing method for soft package lithium ion battery |
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| CN202010887351.4A CN112259936A (en) | 2020-08-28 | 2020-08-28 | Liquid supplementing and repairing method for soft package lithium ion battery |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113097569A (en) * | 2021-04-01 | 2021-07-09 | 合肥国轩高科动力能源有限公司 | Manufacturing method and maintenance method of maintainable soft package lithium ion battery |
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| CN113097569A (en) * | 2021-04-01 | 2021-07-09 | 合肥国轩高科动力能源有限公司 | Manufacturing method and maintenance method of maintainable soft package lithium ion battery |
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