CN112768812A - Soft package lithium battery cell capable of prolonging service cycle and manufacturing method - Google Patents
Soft package lithium battery cell capable of prolonging service cycle and manufacturing method Download PDFInfo
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- CN112768812A CN112768812A CN202011633411.6A CN202011633411A CN112768812A CN 112768812 A CN112768812 A CN 112768812A CN 202011633411 A CN202011633411 A CN 202011633411A CN 112768812 A CN112768812 A CN 112768812A
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- Prior art keywords
- electrolyte
- lithium battery
- soft
- battery cell
- negative
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 39
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 34
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 19
- 239000003792 electrolyte Substances 0.000 claims abstract description 91
- 238000003860 storage Methods 0.000 claims abstract description 32
- 238000001179 sorption measurement Methods 0.000 claims abstract description 21
- 239000002985 plastic film Substances 0.000 claims abstract description 18
- 229920006255 plastic film Polymers 0.000 claims abstract description 18
- 230000002035 prolonged effect Effects 0.000 claims abstract description 16
- 238000002955 isolation Methods 0.000 claims abstract description 12
- 238000010030 laminating Methods 0.000 claims description 15
- 238000004804 winding Methods 0.000 claims description 12
- 239000012528 membrane Substances 0.000 claims description 10
- 239000004642 Polyimide Substances 0.000 claims description 7
- 239000002131 composite material Substances 0.000 claims description 7
- 230000007797 corrosion Effects 0.000 claims description 7
- 238000005260 corrosion Methods 0.000 claims description 7
- 229920001721 polyimide Polymers 0.000 claims description 7
- 229920000642 polymer Polymers 0.000 claims description 7
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 238000007731 hot pressing Methods 0.000 claims description 4
- 229910001416 lithium ion Inorganic materials 0.000 claims description 4
- 238000010521 absorption reaction Methods 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 238000004806 packaging method and process Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 6
- 239000002390 adhesive tape Substances 0.000 description 4
- 230000005611 electricity Effects 0.000 description 4
- 230000000740 bleeding effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000003487 electrochemical reaction Methods 0.000 description 2
- 238000005056 compaction Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007773 negative electrode material Substances 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The invention discloses a soft package lithium battery cell capable of prolonging the service cycle and a manufacturing method thereof, wherein the soft package lithium battery cell comprises an electrode group and an electrolyte storage device, the electrode group is packaged in an aluminum-plastic film shell, the electrode group comprises a positive plate for leading out positive current, a negative plate for leading out negative current and electrolyte which is attached to the insides of the positive plate and the negative plate and assists current flowing, the electrolyte storage device comprises an isolation film and an electrolyte adsorption carrier positioned on the upper surface of the isolation film, one end of the positive plate and one end of the negative plate are respectively stacked on the lower surface of the isolation film, and the isolation of current flowing between the positive plate and the negative plate is realized by the isolation film. By the method, the storage capacity and the utilization rate of the electrolyte in the soft-package lithium battery core are improved, the attenuation speed of the battery core capacity is reduced, and the service life of the soft-package lithium battery core is prolonged.
Description
Technical Field
The invention relates to the field of energy storage of soft-package lithium battery cells, in particular to a soft-package lithium battery cell with a prolonged service life and a manufacturing method thereof.
Background
The lithium cell distinguishes according to the shell type, generally divide into cylinder electricity core, square electric core, soft-packaged electric core, cylinder electricity core and square electric core all wrap up through aluminum hull and insulating film, and soft-packaged electric core passes through the plastic-aluminum membrane shell parcel, and to the charge-discharge process, electrolyte is lithium ion removal, produces the indispensable condition of electric current, when electrolyte content crosses lowly in the electrode, will lead to the unable normal clear of electrochemical reaction, shows to be the quick decay of electric core capacity, and the life-span that often says shortens promptly.
The short service life of the battery core is mainly caused by poor stability of positive and negative electrode materials, too low storage capacity of electrolyte (the factor has obvious influence on a soft package battery core), too high compaction density of the motor, short circuit inside the battery core and the like. For a soft package battery core, the factor that the storage amount of the electrolyte is too low is dominant, and the main reasons are as follows: square and cylinder electricity core has hard shell, and when the electricity core design, can reserve unnecessary regional storage electrolyte, and soft-packaged electric core is soft owing to the shell is the plastic-aluminum membrane, and the material is softer, even reserve unnecessary regional storage electrolyte when electric core designs, also can be taken out in links such as bleeding, hot pressing of electric core equipment, so unnecessary electrolyte can't be saved. At electric core circulation later stage, along with progressively exhausting of electrolyte (including the electrolyte that normal electrochemical reaction consumed and the electrolyte that the side reaction consumed), lithium ion can't effectively remove in electric core, very big restriction the application of soft-packaged electric core, the leading cause that shortens for soft-packaged electric core life cycle.
Disclosure of Invention
The invention aims to provide a soft-package lithium battery cell with a prolonged service life and a manufacturing method thereof, and aims to solve the problem that the service life of the soft-package lithium battery cell in the prior art is short.
In order to achieve the purpose, the invention provides the following technical scheme:
a soft package lithium battery cell capable of prolonging the service cycle comprises an electrode group and an electrolyte storage device, wherein the electrode group and the electrolyte storage device are packaged in an aluminum-plastic film shell;
the electrode group comprises a positive plate for leading out positive current, a negative plate for leading out negative current and electrolyte which is attached to the insides of the positive plate and the negative plate and assists current flow;
the electrolyte storage device comprises an isolating membrane and an electrolyte adsorption carrier positioned on the upper surface of the isolating membrane;
one end of the positive plate and one end of the negative plate are respectively stacked on the lower surface of the isolation film, and the isolation of current flowing between the positive plate and the negative plate is realized by the isolation film.
Preferably, in the electrode group, the positive electrode sheet is formed by winding or laminating at least two positive electrodes, and the negative electrode sheet is formed by winding or laminating at least two negative electrodes.
Preferably, in the electrolyte storage device, the isolating film is fixedly connected with the electrolyte adsorption carrier on the upper surface of the isolating film through a fixing piece, and the fixing piece is a polyimide adhesive tape resistant to electrolyte corrosion.
Preferably, the material of the electrolyte adsorption carrier is a porous polymer composite material.
The invention provides a manufacturing method of a soft-package lithium battery cell with a prolonged service life, which comprises the following steps:
step 1, winding or laminating at least two positive electrodes to form a positive plate, winding or laminating at least two negative electrodes to form a negative plate, forming an electrode group by the positive plate and the negative plate, and then entering step 2;
step 2, sequentially laminating an isolating film and an electrolyte adsorption carrier at one end of the positive plate and one end of the negative plate, fixing the isolating film and the electrolyte adsorption carrier through a fixing piece, and then entering step 3;
step 3, sealing and packaging the electrode group and the electrolyte storage device by using the aluminum-plastic film shell, exposing one end of the positive plate far away from the electrolyte storage device and one end of the negative plate far away from the electrolyte storage device outside the aluminum-plastic film shell, injecting electrolyte into the aluminum-plastic film shell, standing and placing until the electrolyte is completely adsorbed in the electrolyte adsorption carrier, and then entering step 4;
and 4, performing air exhaust, hot pressing, edge sealing and edge cutting on the aluminum plastic film shell injected with the electrolyte to finish the manufacturing of the soft package lithium battery core.
Preferably, the manufacturing method of the soft-packaged lithium battery cell mentioned in step 1 to step 4 is completed under a dry condition.
Preferably, in step 2, the fixing member is a polyimide tape resistant to electrolyte corrosion, and the porous polymer composite material is selected as a material of the electrolyte adsorption carrier.
Preferably, in the step 3, the electrolyte is injected into the electrolyte storage device, and the mixture is left standing for at least 24 hours.
Compared with the prior art, the soft-package lithium battery cell with the prolonged service cycle has the following technical effects:
in the process of assembling the battery core, the electrolyte adsorption carrier is added, so that the storage amount of the electrolyte stored in the battery core is higher, the attenuation speed of the capacity of the battery core is reduced by improving the storage amount of the electrolyte in the soft package lithium core and the utilization rate of the electrolyte, the service life of the soft package lithium core is further prolonged, the problem of capacity attenuation caused by insufficient electrolyte in the charging and discharging cycle process of the soft package lithium core is effectively solved, the service life of the soft package lithium core is prolonged, the use amount of the battery is reduced, and the pollution of harmful substances in the waste soft package lithium core to the environment is reduced.
Drawings
FIG. 1 is a schematic diagram of the structure of an electrode assembly and electrolyte assembly according to an exemplary embodiment of the invention;
fig. 2 is a schematic structural view of a soft-packed lithium battery cell according to an exemplary embodiment of the invention;
fig. 3 is a diagram of a method for manufacturing a soft-packed lithium battery cell according to an exemplary embodiment of the invention.
Detailed Description
In order to better understand the technical content of the present invention, specific embodiments are described below with reference to the accompanying drawings.
In this disclosure, aspects of the present invention are described with reference to the accompanying drawings, in which a number of illustrative embodiments are shown. Embodiments of the present disclosure are not necessarily intended to include all aspects of the invention. It should be appreciated that the various concepts and embodiments described above, as well as those described in greater detail below, may be implemented in any of numerous ways, as the disclosed concepts and embodiments are not limited to any one implementation. In addition, some aspects of the present disclosure may be used alone, or in any suitable combination with other aspects of the present disclosure.
With reference to fig. 1 and 2, the soft-package lithium battery core according to the exemplary embodiment of the present invention, which is shown in fig. 1 and 2, reduces the attenuation speed of the battery core capacity by increasing the electrolyte storage amount and the electrolyte utilization rate in the soft-package lithium battery core, so as to further extend the service life of the soft-package lithium battery core, includes an electrode group and an electrolyte storage device, which are packaged in an aluminum-plastic film casing, wherein one end of the electrode group is connected to the electrolyte storage device, and the other end of the electrode group, i.e., the positive and negative electrode plates, penetrates through the aluminum-plastic film casing and is exposed outside the aluminum-plastic film casing;
the electrode group comprises a positive plate for leading out positive current, a negative plate for leading out negative current and electrolyte which is attached to the insides of the positive plate and the negative plate and assists current flow, wherein the positive plate is formed by winding or laminating at least two positive electrodes, and the negative plate is formed by winding or laminating at least two negative electrodes;
the electrolyte storage device comprises an isolating membrane and an electrolyte adsorption carrier positioned on the upper surface of the isolating membrane;
one end of the positive plate and one end of the negative plate are respectively stacked on the lower surface of the isolating film, and the isolating film realizes the isolation of current flowing between the positive plate and the negative plate;
the isolating film is fixedly connected with the electrolyte adsorption carrier positioned on the upper surface of the isolating film through a fixing piece, the fixing piece is a polyimide adhesive tape resistant to electrolyte corrosion, and the polyimide adhesive tape can resist the corrosion of electrolyte;
the material of electrolyte absorption carrier is porous polymer composite, can adsorb more electrolyte, and porous polymer composite is to the adsorption affinity of electrolyte simultaneously, and in the real manufacturing process of soft packet of lithium cell, avoid in the encapsulation link of bleeding, electrolyte in the electrolyte absorption carrier is taken out, lets the electrolyte memory space of the inside storage of electric core higher, effectively solves the not enough capacity decay problem that leads to of circulation later stage electrolyte, improves the life cycle of electric core.
According to the embodiment of the invention, a manufacturing method of the soft-package lithium battery cell with the prolonged service life is also provided, and with reference to fig. 3, the method performs the following steps in a dry environment:
step 1, winding or laminating at least two positive electrodes to form a positive plate, winding or laminating at least two negative electrodes to form a negative plate, forming an electrode group by the positive plate and the negative plate, and then entering step 2;
step 2, sequentially laminating an isolating membrane and an electrolyte adsorption carrier made of a porous polymer composite material at one end of the positive plate and one end of the negative plate, fixing the isolating membrane and the electrolyte adsorption carrier through a fixing piece polyimide adhesive tape resistant to electrolyte corrosion, and then entering step 3;
step 3, sealing and packaging the electrode group and the electrolyte storage device by using the aluminum-plastic film shell, exposing one end of the positive plate far away from the electrolyte storage device and one end of the negative plate far away from the electrolyte storage device outside the aluminum-plastic film shell, injecting electrolyte into the aluminum-plastic film shell, standing for at least 24 hours until the electrolyte is completely adsorbed in the electrolyte adsorption carrier, and then entering step 4;
and 4, performing air exhaust, hot pressing, edge sealing and edge cutting on the aluminum plastic film shell injected with the electrolyte to finish the manufacturing of the soft package lithium battery core.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, the protection scope of the present invention should be determined by the appended claims.
Claims (9)
1. A soft package lithium battery cell capable of prolonging the service cycle is characterized by comprising an electrode group and an electrolyte storage device, wherein the electrode group and the electrolyte storage device are packaged in an aluminum-plastic film shell;
the electrode group comprises a positive plate for leading out positive current, a negative plate for leading out negative current and electrolyte which is attached to the insides of the positive plate and the negative plate and assists current flow;
the electrolyte storage device comprises an isolating membrane and an electrolyte adsorption carrier positioned on the upper surface of the isolating membrane;
one end of the positive plate and one end of the negative plate are respectively stacked on the lower surface of the isolation film, and the isolation of current flowing between the positive plate and the negative plate is realized by the isolation film.
2. The lithium battery pack with the prolonged service cycle according to claim 1, wherein in the electrode group, the positive electrode sheet is formed by winding or laminating at least two positive electrodes, and the negative electrode sheet is formed by winding or laminating at least two negative electrodes.
3. The lithium ion battery pack with the prolonged service cycle as claimed in claim 1, wherein the separator is fixedly connected to the electrolyte absorption carrier on the upper surface of the separator by a fixing member, and the fixing member is a polyimide tape resistant to electrolyte corrosion.
4. The lithium battery pack with the prolonged service life according to claim 1, wherein the electrolyte adsorption carrier is made of a porous polymer composite.
5. The manufacturing method of the soft-package lithium battery cell with the prolonged service cycle is characterized by comprising the following steps:
step 1, winding or laminating at least two positive electrodes to form a positive plate, winding or laminating at least two negative electrodes to form a negative plate, forming an electrode group by the positive plate and the negative plate, and then entering step 2;
step 2, sequentially laminating an isolating film and an electrolyte adsorption carrier at one end of the positive plate and one end of the negative plate, fixing the isolating film and the electrolyte adsorption carrier through a fixing piece, and then entering step 3;
step 3, sealing and packaging the electrode group and the electrolyte storage device by using the aluminum-plastic film shell, exposing one end of the positive plate far away from the electrolyte storage device and one end of the negative plate far away from the electrolyte storage device outside the aluminum-plastic film shell, injecting electrolyte into the aluminum-plastic film shell, standing and placing until the electrolyte is completely adsorbed in the electrolyte adsorption carrier, and then entering step 4;
and 4, performing air exhaust, hot pressing, edge sealing and edge cutting on the aluminum plastic film shell injected with the electrolyte to finish the manufacturing of the soft package lithium battery core.
6. The manufacturing method of the soft-packaged lithium battery cell with the prolonged service life according to claim 5, wherein the manufacturing method of the soft-packaged lithium battery cell mentioned in the steps 1 to 4 is completed under a dry condition.
7. The manufacturing method of the lithium-ion battery pack with the prolonged service cycle as claimed in claim 6, wherein in the step 2, the fixing member is a polyimide tape resistant to electrolyte corrosion.
8. The manufacturing method of the soft-packaged lithium battery cell with the prolonged service life according to claim 6, wherein in the step 2, a porous polymer composite material is selected as a material of an electrolyte adsorption carrier.
9. The manufacturing method of the soft-package lithium battery cell with the prolonged service life according to claim 6, wherein in the step 3, the electrolyte is injected into the electrolyte storage device, and the soft-package lithium battery cell is left standing for at least 24 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011633411.6A CN112768812A (en) | 2020-12-31 | 2020-12-31 | Soft package lithium battery cell capable of prolonging service cycle and manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011633411.6A CN112768812A (en) | 2020-12-31 | 2020-12-31 | Soft package lithium battery cell capable of prolonging service cycle and manufacturing method |
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| Publication Number | Publication Date |
|---|---|
| CN112768812A true CN112768812A (en) | 2021-05-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011633411.6A Pending CN112768812A (en) | 2020-12-31 | 2020-12-31 | Soft package lithium battery cell capable of prolonging service cycle and manufacturing method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113644351A (en) * | 2021-06-28 | 2021-11-12 | 广东嘉尚新能源科技有限公司 | Soft-package lithium battery core assembly capable of prolonging service life of battery cell and lithium battery cell manufacturing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008159316A (en) * | 2006-12-21 | 2008-07-10 | Fdk Corp | Lithium ion occlusion/release type organic electrolyte storage battery |
| CN101359728A (en) * | 2008-08-19 | 2009-02-04 | 龙计明 | Negative pressure type plastic housing ball valve lithium ionic battery and manufacturing method thereof |
| CN208674280U (en) * | 2018-12-14 | 2019-03-29 | 广东天劲新能源科技股份有限公司 | A kind of lithium battery of long circulation life |
| CN111640883A (en) * | 2020-05-27 | 2020-09-08 | 广东博力威科技股份有限公司 | Aluminum plastic film and flexible package battery |
-
2020
- 2020-12-31 CN CN202011633411.6A patent/CN112768812A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008159316A (en) * | 2006-12-21 | 2008-07-10 | Fdk Corp | Lithium ion occlusion/release type organic electrolyte storage battery |
| CN101359728A (en) * | 2008-08-19 | 2009-02-04 | 龙计明 | Negative pressure type plastic housing ball valve lithium ionic battery and manufacturing method thereof |
| CN208674280U (en) * | 2018-12-14 | 2019-03-29 | 广东天劲新能源科技股份有限公司 | A kind of lithium battery of long circulation life |
| CN111640883A (en) * | 2020-05-27 | 2020-09-08 | 广东博力威科技股份有限公司 | Aluminum plastic film and flexible package battery |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113644351A (en) * | 2021-06-28 | 2021-11-12 | 广东嘉尚新能源科技有限公司 | Soft-package lithium battery core assembly capable of prolonging service life of battery cell and lithium battery cell manufacturing method |
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Application publication date: 20210507 |
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