CN110707367A - Opening formation method for soft package lithium ion battery production - Google Patents
Opening formation method for soft package lithium ion battery production Download PDFInfo
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- CN110707367A CN110707367A CN201910947620.9A CN201910947620A CN110707367A CN 110707367 A CN110707367 A CN 110707367A CN 201910947620 A CN201910947620 A CN 201910947620A CN 110707367 A CN110707367 A CN 110707367A
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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
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
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- 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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- 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 an opening formation method for producing a soft package lithium ion battery, which synchronously exhausts in a formation process and comprises the following steps: clamping a battery cell; (II) pressing a clamp; (III) formation energization; (IV) air bag adsorption; (V) piercing the air bag; sixthly, forming a battery cell; (seventhly), the formation is finished; (eighth), sealing the puncture; (nine) balancing the air pressure; (ten) standing and grading; (eleven) opening the clamp; and (twelfth) taking out the battery cell, and performing subsequent secondary sealing and edge cutting processes. The invention synchronously exhausts in the formation process in the battery production process, reduces the equipment investment cost of separate treatment, shortens the formation time and improves the production efficiency.
Description
Technical Field
The invention relates to the technical field of battery production, in particular to an opening formation method for soft package lithium ion battery production.
Background
The production and manufacturing of the lithium ion battery are processes strictly connected by process steps, in the whole, the production of the lithium ion battery comprises a pole piece manufacturing process, a battery assembling process and a final liquid injection, sealing, formation and aging process, in the processes of the three stages, each process has a plurality of key processes, each step can greatly influence the final performance of the battery, and after the sealed battery cell is completed, the formation is needed, namely, the manufactured lithium ion battery is charged and discharged by small current for one time.
After the battery is manufactured, the electrode material is not in an optimal usable state or the physical properties are not appropriate. For example, the particles are too large, the contact is not tight or the phases are not themselves in register. For example, metal oxide cathodes, which are some alloying mechanisms, require a first charge-discharge to activate them. In the process of first charging of a lithium battery, Li < + > is extracted from an anode active substance and is embedded between negative electrode graphite material layers after passing through an electrolyte, a diaphragm and the electrolyte, electrons are transferred from an anode to a cathode along a peripheral circuit, at the moment, the electrons are embedded into the graphite cathode at a lower potential and react with the electrolyte to generate an SEI film and partial gas, the partial gas is generated in the process and is consumed along with a small amount of electrolyte, and some battery manufacturers can perform battery exhaust and liquid supplement operations after the process, particularly for a titanic acid battery, the generated gas can generate a large amount of gas to cause the battery bulge to be more than 10% thick.
The battery exhaust process after formation is a key process in the formation process, most battery manufacturers independently exhaust after the charging and discharging processes, the whole formation process adopting low-current formation has long time, and the liquid injection hole must be sealed and sealed in the process to prevent the electrolyte from being gasified and lost in the high-temperature and high-pressure process for a long time. Because lithium ion is sensitive to water, in the process of manufacturing the battery, a small amount of moisture exists in the pole piece or the electrolyte, a large amount of gas is generated in the formation process, the gas cannot be discharged in the closed battery, and after the gas generated in the formation process is completely formed, the liquid injection hole needs to be opened to exhaust the gas, and then the gas is sealed again, so that the production efficiency is low.
For the hot pressing formation process after the injection of the lithium ion battery, the prior art generally adopts the process method as shown in fig. 1 and fig. 2, and the process in fig. 1 is as follows: the method comprises the steps of front-stage process, formation, exhaust, secondary sealing, edge cutting, volume grading and subsequent process. The process in fig. 2 is: the method comprises the steps of front-stage process, formation, volume grading, exhaust, secondary sealing, trimming and subsequent process. The formation process and the exhaust process of the two process methods are separately carried out and different equipment or tool fixtures are adopted, so that the equipment investment is high, the formation time is long, and the production efficiency is low.
Disclosure of Invention
Aiming at the defects of the prior art, the invention solves the technical problems that the formation-exhaust process is separated in the production process of the battery, so that the equipment investment cost is high, the formation time is long, and the production efficiency is low.
In order to solve the technical problems, the invention adopts the technical scheme that the opening formation method for producing the soft package lithium ion battery synchronously exhausts in the formation process, and comprises the following steps:
clamping a battery cell, namely clamping the soft-package lithium ion battery cell in each laminated board of a hot pressing forming clamp;
pressing the clamp, namely pressing the battery cell by the laminated plate of the hot-pressing forming clamp, and simultaneously driving the opening forming and exhausting integrated device fixedly arranged on the top of the laminated plate to clamp the battery cell air bag;
thirdly, electrifying the formation, controlling the hot-pressing formation clamp to be connected with a battery cell formation charging and discharging power supply through the central control unit, charging the battery cell for the first time, and starting the formation process of the battery cell;
(IV) air bag adsorption, opening the air bag to form an integrated device for exhaust, generating a preset negative pressure in a sucker cavity of the integrated device, and closely adsorbing a sucker bell mouth on the side surface of the air bag of the electric core;
(V) puncturing the air bag, starting a pneumatic component in the opening and exhaust integrated device to work and input compressed air, pushing a bayonet mechanism to act by the compressed air, and puncturing the electric core air bag adsorbed by the sucker by the bayonet in the cavity of the sucker;
(VI) forming the battery core, starting a charging process by a hot pressing forming process, and leading out gas generated in the battery forming process through a puncture hole, the gas passes through the sucker cavity and is led out through an extraction hole of the opening forming and exhausting integrated device under the action of constant negative pressure in the sucker cavity;
(VII) after the formation is finished and the whole process of the hot-pressing formation is finished, the central control unit disconnects the charging and discharging power supply of the battery cell;
(eighth), sealing the puncture, namely sealing the puncture of the gas bag of the battery cell by an opening forming and exhausting integrated device;
the sealing operation is a hot-press sealing operation or a glue-spraying sealing operation.
The hot pressing sealing operation is to clamp the battery cell air bag through two heat-sealing frames, heating wires are arranged in the heat-sealing frames, and the heat-sealing frames are heated to a preset temperature to seal the battery cell air bag around the puncture hole in a sealing manner.
The glue spraying and sealing operation is that a silica gel nozzle is arranged in a sucker cavity of the integrated device with opening formation and exhaust, and after the formation is finished, the nozzle sprays special glue to seal the periphery of a puncture hole.
(ninth), the air pressure is balanced, and the negative pressure device stops working to enable the air opening formation and exhaust integrated device to be consistent with the external air pressure in the cavity of the sucker;
(ten) standing and grading, and standing and grading the battery;
(eleventh), the clamp is opened, and the cold and hot pressure clamp is opened and simultaneously the sucker of the integrated device for formation and exhaust leaves the air bag of the battery cell;
and (twelfth) taking out the battery cell, and performing subsequent secondary sealing and edge cutting processes.
Compared with the prior art, the invention synchronously exhausts in the formation process in the production process of the battery, reduces the equipment investment cost of separate treatment, shortens the formation time and improves the production efficiency.
Drawings
FIG. 1 is one of the prior art flow diagrams;
FIG. 2 is a second flowchart of the prior art;
FIG. 3 is a front view of the structure of the integrated device for opening formation and exhausting;
FIG. 4 is a rear view of the integrated vent and exhaust device structure;
FIG. 5 is an exploded view of the integrated device for opening formation and exhausting;
FIG. 6 is a schematic view showing the structural relationship between the bayonet mechanism, the front seat and the suction cup;
FIG. 7 is a schematic view of a spray sealing mechanism;
FIG. 8 is a flow chart of the present invention.
Detailed Description
The following further describes the embodiments of the present invention with reference to the drawings, but the present invention is not limited thereto.
Fig. 1 is one of the processes of the prior art, and the process comprises: the method comprises the steps of front-stage process, formation, exhaust, secondary sealing, edge cutting, volume grading and subsequent process.
Fig. 2 shows a second process of the prior art, which comprises the following steps: the method comprises the steps of front-stage process, formation, volume grading, exhaust, secondary sealing, trimming and subsequent process.
Fig. 3 to 6 show an opening formation and exhaust integrated device, which comprises a front section part 1, a rear section part 2 and a sealing mechanism 3, wherein the sealing mechanism 3 is respectively arranged on the front section part 1 and the rear section part 2, the front section part 1 comprises a front seat 11, a sucker 12 and a bayonet mechanism, the sucker 12 is arranged on the end surface of the front seat 11, the bayonet mechanism is arranged on the front seat 11 and penetrates out of the sucker 12 and the sealing mechanism 3, the front seat 11 is provided with an air inlet 111 and an air exhaust port 112, the front section part 1 and the rear section part 2 move oppositely in a split structure, the bayonet mechanism acts to puncture an electric core air bag, then the electric core puncture port periphery is sealed by the sealing mechanism 3 after vacuum air exhaust through the air exhaust port 112, and the opening formation, exhaust and sealing purposes are realized.
The front seat 11 has an air inlet 111 and an air exhaust 112 on its side, the front side is connected with the suction cup 12 in a sealing manner, the end surface of the sealing area is provided with an air passage 113 communicated with the air exhaust 112, the back side is provided with a sinking platform and an upper sinking platform, the center of the sinking platform is provided with a through hole, and the surface of the upper sinking platform is also provided with an air channel communicated with the air inlet 111.
As shown in fig. 6, the bayonet mechanism includes a bayonet 131, a sliding sleeve 132, a spring 133, a piston 134, a counter thread 135 and a cover plate 136, the sliding sleeve 132 is sleeved and fixed in a through hole formed in the sinking platform, the bayonet 131 is a cylinder with a bayonet head at the front end, a threaded hole is formed at the tail end of the cylinder, the piston 134 is clamped between the spring 133, the counter thread 135 connects the piston 134 with the threaded hole at the tail end of the bayonet 131, two ends of the spring 133 are respectively abutted against the sliding sleeve 132 and the cover plate 136, the cover plate 136 covers the sinking platform formed on the back of the front seat 11, and an air flow groove is formed in the periphery of the piston 134 to allow compressed air to drive the piston 134 to drive the bayonet 131 to slide in.
The sealing mechanism 3 may be a heat sealing mechanism or a spray sealing mechanism.
The heat-seal mechanism seals frame 31, back frame 32 and heater before including, seals frame 31, back before, seals frame 32 and sets up respectively in anterior segment part 1 and back end part 2 correspond and serve, and the heater sets up respectively in the front and seals frame 31, back frame 32 inside so that can heat the frame of sealing to the constant temperature in the short time and carry out the work of sealing in advance of electric core air pocket.
As shown in fig. 7, the injection sealing mechanism is provided with a sealing compound interface 4 at the bottom of the original front seat 11 and the original back seat 21, the sealing compound interface 4 is connected with an L-shaped elbow, the opening of the L-shaped elbow is connected with a sealing compound needle 5, the sealing compound needle 5 has a curved shape with a radian, the needle is located at a distance of about 5mm below the piercing opening 6 of the piercing knife, and the needle is inclined upwards by about 30 degrees to ensure that the glue sprayed from the needle can completely cover the piercing opening 6 of the piercing knife, thereby enhancing the reliability of the piercing opening 6 sealed by the glue.
The rear section component 2 comprises a rear seat 21, and the rear seat 21 is attached to the back of the rear sealing frame 32.
In order to effectively insulate the rear sealing frame 32, as a modification of the present invention, the present invention further includes a heat insulation board 22, and the heat insulation board 22 is disposed between the rear sealing frame 32 and the rear seat 21.
In order to ensure that the bayonet 131 can quickly exhaust the air bag of the battery cell, the invention further comprises a stop block 23, wherein the end face of the stop block 23 corresponding to the bayonet 131 is provided with a bayonet counter bore 231 and is attached and arranged between the rear sealing frame 32 and the heat insulation plate 22.
The working principle of the opening formation and exhaust integrated device is as follows:
when the exhaust process is started, the front member 1 and the rear member 2 move to a predetermined position in opposition to each other. At this time, the suction cup 12 is tightly attached to the stopper 23 to clamp the air bag, and the air bag is tightly attached to the front section member 1 and the rear section member 2 by the negative pressure communicated through the negative pressure port. When compressed air enters the front seat 11 through the air inlet 111, the compressed air flow is gathered between the cover plate 136 and the piston 134 by the air flow grooves on the piston 134, so that the piston 134 pushes the bayonet 131 to pierce the bayonet counter bore 231 in the block 23 of the rear section component 2, and the action of piercing the air bag is completed. After the puncture is completed, the compressed air stops supplying air, the bayonet 131 is retracted under the reset action of the spring 133, and the air in the air bag is continuously sucked out by the suction cup 12. When the heat sealing mechanism is used for sealing, the front sealing frame 31 and the rear sealing frame 32 start to be preheated before formation is finished, and when the specified temperature is reached, the front sealing frame 31 moves towards the rear sealing frame 32 to press the air bag and pre-seal the puncture. After several seconds, the front sealing frame 31 returns to the original position, the heating is stopped, the vacuum is cut off, the front section component 1 and the rear section component 2 return to the original positions simultaneously, and the exhaust is finished. When the sealing is carried out by adopting the injection sealing mechanism, when the bayonet pierces the air bag of the electric core 7, the sealing glue needle head 5 sprays the special glue 8 to cover the piercing opening 6 of the bayonet at the same time, the formation is finished, and the piercing opening 6 can be tightly adhered with the rear section component 2 through the front section component 1 to complete the sealing of the periphery of the piercing opening 6. The vacuum is cut off, the front section component 1 and the rear section component 2 return to the original positions at the same time, and the exhaust is finished.
Based on the above opening formation and exhaust integrated device, fig. 8 shows an opening formation method for soft package lithium ion battery production, wherein the formation process synchronously exhausts gas, and the method comprises the following steps:
clamping a battery cell, namely clamping the soft-package lithium ion battery cell in each laminated board of a hot pressing forming clamp;
pressing the clamp, namely pressing the battery cell by the laminated plate of the hot-pressing forming clamp, and simultaneously driving the opening forming and exhausting integrated device fixedly arranged on the top of the laminated plate to clamp the battery cell air bag;
thirdly, electrifying the formation, controlling the hot-pressing formation clamp to be connected with a battery cell formation charging and discharging power supply through the central control unit, charging the battery cell for the first time, and starting the formation process of the battery cell;
(IV) air bag adsorption, opening the air bag to form an integrated device for exhaust, generating a preset negative pressure in a sucker cavity of the integrated device, and closely adsorbing a sucker bell mouth on the side surface of the air bag of the electric core;
(V) puncturing the air bag, starting a pneumatic component in the opening and exhaust integrated device to work and input compressed air, pushing a bayonet mechanism to act by the compressed air, and puncturing the electric core air bag adsorbed by the sucker by the bayonet in the cavity of the sucker;
(VI) forming the battery core, starting a charging process by a hot pressing forming process, and leading out gas generated in the battery forming process through a puncture hole, the gas passes through the sucker cavity and is led out through an extraction hole of the opening forming and exhausting integrated device under the action of constant negative pressure in the sucker cavity;
(VII) after the formation is finished and the whole process of the hot-pressing formation is finished, the central control unit disconnects the charging and discharging power supply of the battery cell;
(eighth), sealing the puncture, namely sealing the puncture of the gas bag of the battery cell by an opening forming and exhausting integrated device;
the sealing operation is a hot-press sealing operation or a glue-spraying sealing operation.
The hot pressing sealing operation is to clamp the battery cell air bag through two heat-sealing frames, heating wires are arranged in the heat-sealing frames, and the heat-sealing frames are heated to a preset temperature to seal the battery cell air bag around the puncture hole in a sealing manner.
The glue spraying and sealing operation is that a silica gel nozzle is arranged in a sucker cavity of the integrated device with opening formation and exhaust, and after the formation is finished, the nozzle sprays special glue to seal the periphery of a puncture hole.
(ninth), the air pressure is balanced, and the negative pressure device stops working to enable the air opening formation and exhaust integrated device to be consistent with the external air pressure in the cavity of the sucker;
(ten) standing and grading, and standing and grading the battery;
(eleventh), the clamp is opened, and the cold and hot pressure clamp is opened and simultaneously the sucker of the integrated device for formation and exhaust leaves the air bag of the battery cell;
and (twelfth) taking out the battery cell, and performing subsequent secondary sealing and edge cutting processes.
Compared with the prior art, the invention synchronously exhausts in the formation process in the production process of the battery, reduces the equipment investment cost of separate treatment, shortens the formation time and improves the production efficiency.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention.
Claims (4)
1. An opening formation method for soft package lithium ion battery production is characterized in that exhaust is synchronously performed in a formation process, and the method comprises the following steps:
clamping a battery cell, namely clamping the soft-package lithium ion battery cell in each laminated board of a hot pressing forming clamp;
pressing the clamp, namely pressing the battery cell by the laminated plate of the hot-pressing forming clamp, and simultaneously driving the opening forming and exhausting integrated device fixedly arranged on the top of the laminated plate to clamp the battery cell air bag;
thirdly, electrifying the formation, controlling the hot-pressing formation clamp to be connected with a battery cell formation charging and discharging power supply through the central control unit, charging the battery cell for the first time, and starting the formation process of the battery cell;
(IV) air bag adsorption, opening the air bag to form an integrated device for exhaust, generating a preset negative pressure in a sucker cavity of the integrated device, and closely adsorbing a sucker bell mouth on the side surface of the air bag of the electric core;
(V) puncturing the air bag, starting a pneumatic component in the opening and exhaust integrated device to work and input compressed air, pushing a bayonet mechanism to act by the compressed air, and puncturing the electric core air bag adsorbed by the sucker by the bayonet in the cavity of the sucker;
(VI) forming the battery core, starting a charging process by a hot pressing forming process, and leading out gas generated in the battery forming process through a puncture hole, the gas passes through the sucker cavity and is led out through an extraction hole of the opening forming and exhausting integrated device under the action of constant negative pressure in the sucker cavity;
(VII) after the formation is finished and the whole process of the hot-pressing formation is finished, the central control unit disconnects the charging and discharging power supply of the battery cell;
(eighth), sealing the puncture, namely sealing the puncture of the gas bag of the battery cell by an opening forming and exhausting integrated device;
(ninth), the air pressure is balanced, and the negative pressure device stops working to enable the air opening formation and exhaust integrated device to be consistent with the external air pressure in the cavity of the sucker;
(ten) standing and grading, and standing and grading the battery;
(eleventh), the clamp is opened, and the cold and hot pressure clamp is opened and simultaneously the sucker of the integrated device for formation and exhaust leaves the air bag of the battery cell;
and (twelfth) taking out the battery cell, and performing subsequent secondary sealing and edge cutting processes.
2. The opening formation method for soft package lithium ion battery production according to claim 1, characterized in that in the step (nine), the sealing operation is a hot-press sealing operation or a glue-spraying sealing operation.
3. The opening formation method for producing the soft package lithium ion battery according to claim 2, wherein the hot-press sealing operation is to clamp the battery cell air bag through two heat-seal frames, and a heating wire is arranged in each heat-seal frame to heat and seal the periphery of the piercing opening of the battery cell air bag by heating the heating wire and raising the heat-seal frames to a preset temperature.
4. The opening formation method for producing the soft package lithium ion battery according to claim 2, wherein the glue spraying and sealing operation is to arrange a silica gel nozzle in a cavity of a sucker of the opening formation and exhaust integrated device, and after the formation is completed, the nozzle sprays special glue to seal the periphery of a puncture hole.
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| CN201910947620.9A CN110707367A (en) | 2019-09-30 | 2019-09-30 | Opening formation method for soft package lithium ion battery production |
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| CN201910947620.9A CN110707367A (en) | 2019-09-30 | 2019-09-30 | Opening formation method for soft package lithium ion battery production |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111628136A (en) * | 2020-06-04 | 2020-09-04 | 萨姆蒂萨（天津）数据信息技术有限公司 | Lithium ion pole piece battery pack liquid injection and opening activation method |
| CN113363606A (en) * | 2021-05-17 | 2021-09-07 | 昆山聚创新能源科技有限公司 | Soft package battery formation exhaust method |
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| CN206163641U (en) * | 2016-11-02 | 2017-05-10 | 天津市捷威动力工业有限公司 | Palletization of lithium ion power batteries high temperature becomes exhaust apparatus for car |
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| CN108808141A (en) * | 2018-05-31 | 2018-11-13 | 深圳市新浦自动化设备有限公司 | The method of soft package lithium battery chemical conversion exhaust |
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| CN102593527A (en) * | 2012-03-26 | 2012-07-18 | 西安瑟福能源科技有限公司 | Method for forming polymer lithium ion battery |
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Application publication date: 20200117 |