CN109301332B - Negative pressure formation device for soft package battery - Google Patents
Negative pressure formation device for soft package battery Download PDFInfo
- Publication number
- CN109301332B CN109301332B CN201810928770.0A CN201810928770A CN109301332B CN 109301332 B CN109301332 B CN 109301332B CN 201810928770 A CN201810928770 A CN 201810928770A CN 109301332 B CN109301332 B CN 109301332B
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- CN
- China
- Prior art keywords
- negative pressure
- valve body
- suction nozzle
- pressure suction
- sealing washer
- Prior art date
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- 230000015572 biosynthetic process Effects 0.000 title claims abstract description 25
- 238000007789 sealing Methods 0.000 claims abstract description 19
- 238000001125 extrusion Methods 0.000 claims abstract description 12
- 239000000853 adhesive Substances 0.000 claims description 2
- 230000001070 adhesive effect Effects 0.000 claims description 2
- 229920000642 polymer Polymers 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 9
- 239000007773 negative electrode material Substances 0.000 abstract description 8
- 238000003825 pressing Methods 0.000 abstract description 6
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 8
- 229910001416 lithium ion Inorganic materials 0.000 description 8
- 238000000034 method Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 239000003792 electrolyte Substances 0.000 description 5
- 239000003292 glue Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000007784 solid electrolyte Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- HMDDXIMCDZRSNE-UHFFFAOYSA-N [C].[Si] Chemical compound [C].[Si] HMDDXIMCDZRSNE-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000010405 anode material Substances 0.000 description 1
- 239000010406 cathode material Substances 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001502 supplementing effect Effects 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
- H01M10/058—Construction or manufacture
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/30—Arrangements for facilitating escape of gases
- H01M50/308—Detachable arrangements, e.g. detachable vent plugs or plug systems
-
- 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
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses a negative pressure formation device for a soft package battery, which comprises a negative pressure suction nozzle and a vacuum valve arranged right below the negative pressure suction nozzle. When negative pressure is formed, the negative pressure suction nozzle is pressed downwards, the extrusion baffle on the negative pressure suction nozzle extrudes the lower pressing rod to move downwards, and the lower pressing rod drives the sealing washer to move downwards, so that the upper part, the middle part and the lower part inside the valve body are communicated, and the vacuumizing effect inside the battery cell is realized; after the negative pressure is formed, the negative pressure suction nozzle rises, the lower pressing rod resets under the action of the reset spring, and the sealing washer connected with the bottom end of the lower pressing rod seals the middle part and the lower part of the vacuum valve, so that the effect of keeping the vacuum degree in the battery cell is realized, and the problems that an air passage is formed and the uniformity and the integrity of an SEI film on the surface of a negative electrode material are influenced are solved.
Description
Technical Field
The invention relates to the technical field of negative pressure formation of a soft package battery, in particular to a negative pressure formation device of a soft package battery.
Background
When the lithium ion battery is charged and discharged for the first time, the electrolyte is decomposed to form a Solid Electrolyte Interface (SEI) on the surface of an electrode, and the SEI can separate the electrolyte from a negative electrode material to prevent the electrolyte from being further decomposed. Thereby maintaining the structural stability of the anode material. The reduction of the electrolyte under ideal conditions is limited to the formation phase of the solid electrolyte membrane and this process does not occur when the cycle is stable.
The SEI film can protect negative electrode materials such as silicon carbon, graphite and the like, so that the material structure is not easy to collapse, and the cycle life of the electrode material is prolonged. The SEI film uniformly covers the surface of the negative electrode, lithium ions can freely pass through the SEI film to be embedded or de-embedded in the negative electrode material in the charge-discharge cycle process of the lithium ion battery, solvated lithium ions are prevented from entering the negative electrode, the negative electrode material and the current collector are ensured to have good binding force and electronic conductivity, and the lithium ions which are reduced too fast can be prevented from reacting with solvent molecules in electrolyte to generate a large amount of gas, so that the safety of the lithium ion battery is ensured. The thickness, compactness, composition, uniformity and the like of the SEI film on the surface of the negative electrode of the lithium ion battery directly influence the first irreversible capacity loss of the battery and the cycle performance of the battery, so that the completeness and uniformity of the SEI film are ensured in the manufacturing process of the battery and are of great importance.
The formation process plays a significant role in the formation of an SEI film, and the properties of the SEI film formed on the surface of the cathode material in different formation processes are obviously different. For the lithium ion soft package battery, a commonly used formation process is to seal the soft package battery and reserve an air bag before formation, apply a constraint force to the soft package battery during formation to collect the formed gas in the air bag, and after the formation is finished, remove the constraint force to cut the air bag to release the gas and seal the air bag again. Although this chemical conversion process is simple and easy to operate, its chemical conversion effect is not ideal. Because the formation is carried out in a closed space, the formed gas is easy to escape back into the battery core to form an air passage, which affects the uniformity and integrity of the SEI film on the surface of the negative electrode material and has adverse effects on the cycle performance and the capacity performance of the battery.
Disclosure of Invention
The invention aims to solve the technical problem of providing a negative pressure formation device of a soft package battery, which comprises a negative pressure suction nozzle and a vacuum valve, wherein the negative pressure suction nozzle is used for negative pressure formation, and the vacuum valve is used for conducting, resetting and sealing, so that the problem that formed gas returns to the interior of a battery cell to form an air passage after the negative pressure formation is finished, and the uniformity and the integrity of an SEI film on a negative material surface are influenced is solved.
The technical scheme of the invention is as follows:
a soft package battery negative pressure formation device comprises a negative pressure suction nozzle and a vacuum valve arranged right below the negative pressure suction nozzle; an extrusion baffle plate with a plurality of through holes is arranged at an opening at the bottom end of the negative pressure suction nozzle; the vacuum valve comprises a valve body, a lower pressure rod, a return spring and a sealing washer which are arranged in the valve body, the inner cavity of the valve body comprises an upper part, a middle part and a lower part which are sequentially communicated from top to bottom, the aperture of the upper part and the aperture of the lower part are all larger than that of the middle part, the sealing washer is arranged at the lower part of the valve body, the upper end surface of the sealing washer props against the step surface between the middle part and the lower part of the inner cavity of the valve body, the bottom end of the lower pressure lever sequentially passes through the upper part and the middle part of the inner cavity of the valve body and extends into the lower part to be fixedly connected with the sealing washer, the reset spring is sleeved on the lower pressure rod, the top end of the reset spring is fixedly connected with the outer wall of the lower pressure rod, the bottom end of the reset spring is propped against the step surface between the upper part and the middle part of the inner cavity of the valve body, and under the unstressed state of the reset spring, the top of the lower pressure lever extends out of the valve body and is positioned right below the extrusion baffle.
The extrusion baffle with the plurality of through holes is a latticed extrusion baffle.
And a tab adhesive is arranged on the outer side wall of the bottom of the valve body.
The invention has the advantages that:
the negative pressure forming device comprises a negative pressure suction nozzle and a vacuum valve, wherein when the negative pressure suction nozzle is pressed downwards, the vacuum valve is opened to carry out negative pressure forming operation, after the negative pressure forming is finished, the negative pressure suction nozzle only needs to be moved upwards to be separated from the vacuum valve, and the vacuum valve is reset and closed, so that the problem that formed gas returns to enter the interior of a battery core to form an air passage to influence the uniformity and integrity of an SEI film on the surface of a negative electrode material is solved. The invention has simple structure and convenient operation, and avoids the problems of air passage formation and influence on the uniformity and integrity of the SEI film on the surface of the negative electrode material while ensuring the vacuum degree in the soft package battery after the soft package battery is formed by negative pressure.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
Referring to fig. 1, the negative pressure formation device for the soft package battery comprises a negative pressure suction nozzle 1 and a vacuum valve arranged right below the negative pressure suction nozzle 1; a latticed extrusion baffle 2 is arranged at an opening at the bottom end of the negative pressure suction nozzle 1; the vacuum valve comprises a valve body 3, a lower press rod 4, a reset spring 5 and a sealing washer 6 which are arranged inside the valve body 3, wherein the outer side wall of the bottom of the valve body 3 is provided with a tab glue 7, the inner cavity of the valve body 1 comprises an upper part, a middle part and a lower part which are sequentially communicated from top to bottom, the aperture of the upper part and the aperture of the lower part are both larger than the aperture of the middle part, the sealing washer 6 is arranged at the lower part of the valve body 3, the upper end face of the sealing washer 6 props against the step face between the middle part and the lower part of the inner cavity of the valve body 3, the bottom end of the lower press rod 4 sequentially penetrates through the upper part and the middle part of the inner cavity of the valve body 3 and extends into the lower part to be fixedly connected with the sealing washer 6, the reset spring 5 is sleeved on the lower press rod 4, the top end, the top of the lower pressure rod 4 extends out of the valve body 3 and is positioned right below the extrusion baffle 2.
The working principle of the invention is as follows:
when the soft-package battery cell is subjected to heat sealing, one end of a tab glue 7 of a vacuum valve is thermally sealed at the side end of the soft-package battery cell, the lower part of an inner cavity of the vacuum valve is communicated with the inside of the battery cell, and heat sealing parameters can be consistent with tab heat sealing parameters; during the negative pressure formation, the one end that electric core is connected with the vacuum valve is upwards placed perpendicularly, and electric core periphery is fixed by anchor clamps, guarantees that electric core can not incline when negative pressure suction nozzle 1 pushes down the vacuum valve, guarantees that vacuum valve and negative pressure suction nozzle contact closely can not lead to the unable maintenance of vacuum because of the dislocation.
When negative pressure is formed, the negative pressure suction nozzle is pressed downwards, the extrusion baffle 2 on the negative pressure suction nozzle 1 extrudes the lower pressing rod 4 to move downwards, and the lower pressing rod 4 drives the sealing washer 6 to move downwards, so that the upper part, the middle part and the lower part inside the valve body 3 are communicated, and the vacuum pumping effect inside the battery core is realized. The negative pressure becomes and finishes, and negative pressure suction nozzle 1 rises, and push down pole 4 resets under reset spring 5's effect, and seal ring 6 that push down 4 bottom connections carries out the shutoff between with the middle part and the lower part of vacuum valve, realizes the effect of keeping of the inside vacuum of electric core.
After the negative pressure formation is finished, the gas is continuously generated in the battery core, the battery core can be subjected to negative pressure vacuumizing again to achieve the gas release effect, and meanwhile, the device can also achieve the effect of supplementing liquid in the battery core. After the negative pressure formation is finished, the aluminum plastic film connected with the lower part of the vacuum valve is heat-sealed by adopting the tab glue 7, and the normal circulation of the battery cell is not influenced.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (3)
1. The utility model provides a laminate polymer battery negative pressure ization becomes device which characterized in that: comprises a negative pressure suction nozzle and a vacuum valve arranged right below the negative pressure suction nozzle; an extrusion baffle plate with a plurality of through holes is arranged at an opening at the bottom end of the negative pressure suction nozzle; the vacuum valve comprises a valve body, a lower pressure rod, a return spring and a sealing washer which are arranged in the valve body, the inner cavity of the valve body comprises an upper part, a middle part and a lower part which are sequentially communicated from top to bottom, the aperture of the upper part and the aperture of the lower part are all larger than that of the middle part, the sealing washer is arranged at the lower part of the valve body, the upper end surface of the sealing washer props against the step surface between the middle part and the lower part of the inner cavity of the valve body, the bottom end of the lower pressure lever sequentially passes through the upper part and the middle part of the inner cavity of the valve body and extends into the lower part to be fixedly connected with the sealing washer, the reset spring is sleeved on the lower pressure rod, the top end of the reset spring is fixedly connected with the outer wall of the lower pressure rod, the bottom end of the reset spring is propped against the step surface between the upper part and the middle part of the inner cavity of the valve body, and under the unstressed state of the reset spring, the top of the lower pressure lever extends out of the valve body and is positioned right below the extrusion baffle.
2. The negative pressure formation device for the soft package battery according to claim 1, characterized in that: the extrusion baffle with the plurality of through holes is a latticed extrusion baffle.
3. The negative pressure formation device for the soft package battery according to claim 1, characterized in that: and a tab adhesive is arranged on the outer side wall of the bottom of the valve body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810928770.0A CN109301332B (en) | 2018-08-15 | 2018-08-15 | Negative pressure formation device for soft package battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810928770.0A CN109301332B (en) | 2018-08-15 | 2018-08-15 | Negative pressure formation device for soft package battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109301332A CN109301332A (en) | 2019-02-01 |
| CN109301332B true CN109301332B (en) | 2020-08-14 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810928770.0A Active CN109301332B (en) | 2018-08-15 | 2018-08-15 | Negative pressure formation device for soft package battery |
Country Status (1)
| Country | Link |
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| CN (1) | CN109301332B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114824688B (en) * | 2022-06-27 | 2022-09-09 | 深圳市昂佳科技有限公司 | Lithium ion battery and module thereof |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11250887A (en) * | 1998-02-28 | 1999-09-17 | Toyota Central Res & Dev Lab Inc | Pressure release structure for battery |
| CN101290974B (en) * | 2007-04-18 | 2010-08-25 | 比亚迪股份有限公司 | Sealing method of battery vacuum and evacuating device |
| CN102169975B (en) * | 2011-03-30 | 2013-01-09 | 广州力柏能源科技有限公司 | Battery injection and formation control device |
| CN106129302B (en) * | 2016-08-10 | 2018-07-10 | 浙江瀚氏模塑科技有限公司 | Product demijohn |
| CN206194856U (en) * | 2016-08-25 | 2017-05-24 | 江苏楚汉新能源科技有限公司 | Lithium ion battery annotates liquid hole sealing device |
| CN207233883U (en) * | 2017-08-14 | 2018-04-13 | 青岛国轩电池有限公司 | A kind of negative pressure system being used in lithium ion battery formation process |
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2018
- 2018-08-15 CN CN201810928770.0A patent/CN109301332B/en active Active
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| Publication number | Publication date |
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| CN109301332A (en) | 2019-02-01 |
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