CN109817878B - Lithium battery liquid injection system and liquid injection method - Google Patents
Lithium battery liquid injection system and liquid injection method Download PDFInfo
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- CN109817878B CN109817878B CN201910210718.6A CN201910210718A CN109817878B CN 109817878 B CN109817878 B CN 109817878B CN 201910210718 A CN201910210718 A CN 201910210718A CN 109817878 B CN109817878 B CN 109817878B
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- 239000007788 liquid Substances 0.000 title claims abstract description 268
- 238000002347 injection Methods 0.000 title claims abstract description 252
- 239000007924 injection Substances 0.000 title claims abstract description 252
- 238000000034 method Methods 0.000 title claims abstract description 34
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 31
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 31
- 238000007600 charging Methods 0.000 claims abstract description 75
- 239000003792 electrolyte Substances 0.000 claims abstract description 26
- 238000005086 pumping Methods 0.000 claims abstract description 13
- 238000012546 transfer Methods 0.000 claims description 61
- 238000001802 infusion Methods 0.000 claims description 12
- 230000037452 priming Effects 0.000 claims description 11
- 238000007789 sealing Methods 0.000 claims description 9
- 125000004122 cyclic group Chemical group 0.000 abstract description 3
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 239000000126 substance Substances 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 5
- 238000007599 discharging Methods 0.000 description 5
- 230000014759 maintenance of location Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010280 constant potential charging Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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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
-
- 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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- Filling, Topping-Up Batteries (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses a lithium battery liquid injection system and a liquid injection method, wherein the lithium battery liquid injection system comprises a conveyor, a working frame for fixing the conveyor, a liquid injection device, a charging device and a vacuum pumping device, wherein trays are arranged on a conveyor belt of the conveyor at intervals; a plurality of battery cells are arranged on the tray; the liquid injection method of the system adopts reasonable liquid injection and vacuumizing times, and after the charging process is increased, the chemical electrolyte is subjected to pre-reaction, so that the gas of the battery is effectively discharged to reduce the internal pressure of the battery, the battery is safer, the battery capacity is increased, the number of times of cyclic charge and discharge is increased, and the service life is prolonged.
Description
Technical Field
The invention relates to the technical field of battery processing, in particular to a lithium battery liquid injection system and a lithium battery liquid injection method.
Background
With the development of modern society, lithium batteries are increasingly used. In the production process of the lithium battery, electrolyte is required to be injected through the injection hole formed in the lithium battery, a certain time is required to be spent when the lithium battery is injected, and the conventional injection method generally adopts the steps of injecting liquid firstly and vacuumizing secondly. Therefore, it is highly desirable to design a new liquid injection method and a liquid injection system.
Disclosure of Invention
In order to solve the problems, the invention discloses a lithium battery liquid injection system, which comprises a conveyor, a working frame for fixing the conveyor, a liquid injection device, a charging device and a vacuumizing device, wherein trays are arranged on a conveying belt of the conveyor at intervals; a plurality of battery cells are arranged on the tray;
the liquid injection device comprises a liquid injection frame, a moving mechanism is fixed below the liquid injection frame through a connecting block, the moving mechanism comprises a moving screw rod, one end of the moving screw rod is connected with a motor, the moving screw rod is connected with the moving frame in a threaded manner, the moving frame is connected with a plurality of liquid injection heads, the liquid injection heads are connected to a liquid injection pump through hoses, and the inlet end of the liquid injection pump is connected with an electrolyte tank; the liquid injection head corresponds to the battery cell;
the vacuum pumping device comprises a fixing frame, wherein the fixing frame comprises a fixing plate, an air cylinder is arranged at the top of the fixing plate, a vacuum cover penetrates through the fixing plate at the telescopic end of the air cylinder and is connected with a vacuum pump through a pipeline, a support column is arranged at the lower end of the fixing plate, and the support column is fixed with the working frame;
a cross rod is fixed above the liquid injection frame, and a plurality of guide devices are arranged on the upper surface of the cross rod; the cross bars are movably arranged at two ends of the upright post of the working frame; the guide device comprises a sliding block arranged on the upper surface of the cross rod, the sliding block is in threaded connection with a screw rod, the screw rod is fixed on the cross beam of the working frame, and one end of the screw rod is connected with a servo motor;
the charging device comprises a top plate, a charging connector for charging a battery cell is arranged on the top plate, and a lifting mechanism is further arranged above the top plate and is fixed on the working frame;
the liquid injection head comprises a needle body, the needle body is provided with a needle head part used for aligning a battery cell liquid injection port and a needle tail part connected with the hose, the needle head part is provided with a liquid outlet, the needle tail part is provided with a liquid inlet, the inside of the needle body is provided with an infusion channel communicated with the liquid outlet and the liquid inlet, the side wall of the infusion channel is close to the position of the needle head part, and the position of the needle head part is provided with a buffer structure used for slowing down the flow rate of electrolyte in the infusion channel.
Preferably, the buffer structure is a buffer groove concavely arranged on the inner wall of the infusion channel in an annular shape.
Preferably, the buffer groove is a thread structure or a crest structure with the diameter gradually decreasing along the liquid flow direction.
Preferably, a sealing ring is arranged at the opening end of the vacuum cover.
Preferably, the lifting mechanism is a pneumatic drive component and/or a hydraulic drive component and/or an electric drive component.
Preferably, the priming device is provided with at least 5 sets.
Preferably, the vacuum-pumping device is provided with at least 8 groups.
A method for injecting liquid into a lithium battery, comprising the steps of:
s1: primary liquid injection: placing the battery cell in the tray, and using a liquid injection device, wherein the liquid injection head starts to inject liquid into the battery cell, and the liquid injection amount is 5-20% of the capacity of the battery cell;
s2: and (5) vacuumizing once: starting a conveyor, conveying battery cells after primary liquid injection to a position corresponding to a vacuumizing device, starting a vacuum pump, and vacuumizing once, wherein the vacuum pressure value is as follows: 15 to-25 Kpa, held for 30-50s;
s3: and (3) secondary liquid injection: the conveyor continuously transfers the battery cell subjected to primary vacuumizing to a liquid injection device for secondary liquid injection of the liquid injection head, wherein the liquid injection amount is 10-20% of the capacity of the battery cell;
s4: and (5) secondary vacuumizing: the conveyor continuously transfers battery cells after secondary liquid injection to a vacuumizing device, a vacuum pump is started for secondary vacuumizing, and the vacuum pressure value is as follows: 55 to-90 Kpa, held for 30-50s;
s5: three liquid injections: the conveyor continuously transfers the battery cell subjected to secondary vacuumizing to a liquid injection device, and the liquid injection head performs three liquid injection, wherein the liquid injection amount is 20-30% of the capacity of the battery cell;
s6: and (3) vacuumizing for three times: the conveyor continuously transfers the battery cells after the three liquid injection to the vacuumizing device, a vacuum pump is started for three vacuumizing, and the vacuum pressure value is as follows: 55 to-90 Kpa, held for 30-50s;
s7: four times of liquid injection: the conveyor continuously transfers the battery cell subjected to three times of vacuumizing to a liquid injection device, and the liquid injection head carries out four times of liquid injection, wherein the liquid injection amount is 10-20% of the capacity of the battery cell;
s8: vacuumizing twice in succession: the conveyor continuously transfers battery cells after four times of liquid injection to two vacuumizing devices which are arranged in parallel, a vacuum pump is started to perform secondary vacuumizing, and the vacuum pressure value is as follows: 60 to-98 Kpa, for 30-50s;
s9: five injections: the conveyor continuously transfers the battery cell processed in the step S8 to a liquid injection device for five times, and the liquid injection amount is 10-20% of the capacity of the battery cell;
s10: and vacuumizing again: the conveyor continuously transfers the battery cells processed in the step S9 to a vacuumizing device, a vacuum pump is started to vacuumize again, and the vacuum pressure value is as follows: 60 to-98 Kpa, for 30-50s;
s11: precharging: and (3) continuously transferring the battery cells processed in the step (S9) to the charging device by the conveyor, clamping electrodes of the battery cells by using a charging connector, and pre-charging, wherein the charging current is as follows: 0.1-0.5C, charging voltage: 2.75-3.0V, charging time: 5-7min;
s12: vacuumizing twice in succession: the conveyor continuously transfers the battery cells processed in the step S11 to a vacuumizing device, a vacuum pump is started to vacuumize again, and the vacuum pressure value is as follows: 60 to-98 Kpa, for 30-50s;
s13: sealing and warehousing.
Further, the relative humidity of the liquid injection environment of the liquid injection method is less than or equal to 1 percent.
Further, the liquid injection environment temperature of the liquid injection method is 22-28 ℃.
The invention has the beneficial effects that: (1) After the charging process is added, the chemical electrolyte reacts in advance, so that the battery capacity can be effectively increased, the number of times of cyclic charging and discharging is increased, and the service life is prolonged; (2) By adopting the liquid injection procedure, bubbles in the electrolyte are gradually discharged, the vacuum degree in the battery is improved, the internal pressure is reduced, and the safety performance is improved; (3) Set up buffer structure between liquid outlet and the inlet in the infusion passageway, at the in-process of injection electrolyte, utilize buffer structure to carry out the blowout in the liquid outlet of infusion passageway after buffering to the electrolyte, reduce the velocity of flow of the electrolyte of liquid outlet department, avoid the too fast phenomenon that leads to the electrolyte to splash at the in-process of annotating the liquid appearance of speed of electrolyte. The output speed of the electrolyte at the liquid outlet is reduced, so that the output quantity of the electrolyte is conveniently controlled in the process of injecting the electrolyte, the efficient liquid injection is realized, the phenomenon of overflow of the electrolyte is reduced, the corrosion of the shell of the battery is avoided, the yield is improved, and the optimization of the production environment is facilitated; (4) According to the invention, the battery cell is injected with the electrolyte and vacuumized for a reasonable number of times, the electrolyte is fully soaked after being injected, and the percentage of free electrolyte in the lithium battery is reduced; (5) The liquid injection method can also ensure that the lithium battery is completely charged in a vacuum environment after liquid injection neutralization is finished; after pre-charging, the vacuum pumping is performed, so that the gas generated during charging can be well discharged, the positive electrode, the diaphragm and the negative electrode are tightly attached, the first efficiency and the capacity are improved, and the internal resistance, the multiplying power performance, the cycle life and other electrical properties of the lithium battery are improved.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic view of the structure of the liquid injection device and the vacuum pumping device of the present invention;
FIG. 3 is a side view of the priming device of the present invention;
FIG. 4 is a schematic view of the moving mechanism of the present invention;
FIG. 5 is a schematic view of the structure of the charging device of the present invention;
FIG. 6 is a schematic view of the structure of the liquid injection head of the present invention;
FIG. 7 is a schematic structural view of the alignment device of the present invention;
FIG. 8 is a flow chart of the method of injecting liquid according to the present invention;
in the figure, the device comprises a 100-priming device, a 200-vacuumizing device, a 300-charging device, a 1-conveying belt, a 2-fixing plate, a 3-cylinder, a 4-cross rod, a 5-supporting column, a 6-telescopic end, a 7-vacuum cover, an 8-guiding device, a 801-sliding block, a 803-screw rod, a 804-servo motor, a 9-priming frame, a 901-connecting block, a 902-moving screw rod, a 903-motor, a 10-moving frame, a 11-priming head, a 1101-needle head, a 1102-needle tail, a 1103-transfusion channel, a 1104-buffer structure, a 12-tray, a 13-battery cell, a 14-top plate, a 15-charging connector, a 16-working frame, a 17-fixing column and a 18-hydraulic cylinder.
Detailed Description
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art in a specific case.
Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Example 1
As shown in fig. 1 and 2, a lithium battery liquid injection system comprises a conveyor and a working frame 16 for fixing the conveyor, the system further comprises a liquid injection device 100, a charging device 300 and a vacuum pumping device 200, wherein trays 12 are arranged on a conveyor belt 1 of the conveyor at intervals; a plurality of battery cells 13 are arranged on the tray 12;
as shown in fig. 3 and 4, the priming device 100 includes a priming frame 9, a moving mechanism is fixed below the priming frame 9 through a connecting block 901, the moving mechanism includes a moving screw rod 902, one end of the moving screw rod 902 is connected with a motor 903, a moving frame 10 is screwed on the moving screw rod 902, the moving frame 10 is connected with a plurality of priming heads 11, the priming heads 11 are connected to a priming pump through hoses, and an electrolyte tank is connected to an inlet end of the priming pump; the liquid injection head corresponds to the battery cell 13;
the vacuum pumping device 200 comprises a fixing frame, wherein the fixing frame comprises a fixing plate 2, a cylinder 3 is arranged at the top of the fixing plate 2, a telescopic end 6 of the cylinder 3 penetrates through the fixing plate 2 and is connected with a vacuum cover 7, the vacuum cover 7 is connected with a vacuum pump through a pipeline, a support column 5 is arranged at the lower end of the fixing plate 2, the support column 5 is fixed with a working frame 16, when the vacuum pumping device is particularly used, the cylinder 3 is started, the telescopic end 6 of the cylinder drives the vacuum cover 7 to move downwards, so that the vacuum cover 7 covers the tray 12 and seals the tray, and then the vacuum pump is started for vacuum pumping;
as shown in fig. 7, a cross rod 4 is fixed above the liquid injection frame 9, and a plurality of guide devices 8 are arranged on the upper surface of the cross rod 4; the cross bars 4 are movably arranged at two ends of the upright post of the working frame 16; the guide device 8 comprises a sliding block 801 arranged on the upper surface of the cross rod 4, the sliding block 801 is in threaded connection with a screw rod 803, the screw rod 803 is fixed on a cross beam of the working frame 16, one end of the screw rod 803 is connected with a servo motor 804, the arrangement can further improve the accuracy and stability of system operation, and when the guide device is particularly used, the servo motor 804 is started, the screw rod 803 drives the sliding block 801 to move so as to drive the cross rod 4 to move, and the cross rod 4 drives the liquid injection frame 9 to move;
as shown in fig. 5, the charging device 300 includes a top plate 14, a charging connector 15 for charging the battery cell 13 is provided on the top plate 14, and a lifting mechanism is further provided above the top plate 4, and is fixed on the working frame 16;
as shown in fig. 6, the liquid injection head 11 includes a needle body, the needle body has a needle head 1101 for aligning with a liquid injection port of a battery cell and a needle tail 1102 connected with the hose, the needle head 1101 has a liquid outlet, the needle tail 1102 has a liquid inlet, an infusion channel 1103 communicating with the liquid outlet and the liquid inlet is disposed in the needle body, and a buffer structure 1104 is disposed on a side wall of the infusion channel 1103 near the position of the needle head.
In a specific implementation, the buffer structure 1104 is a buffer groove concavely provided on the inner wall of the infusion channel in an annular shape, and may also be a thread structure or a peak structure with a diameter gradually decreasing along the liquid flow direction.
Specifically, a sealing ring is arranged at the opening end of the vacuum cover 7.
In still other embodiments, the lifting mechanism is a pneumatic driving component and/or a hydraulic driving component and/or an electric driving component, specifically, as shown in fig. 5, a fixed column is fixed on the working frame 16, and a hydraulic cylinder is connected to the upper end of the top plate and is fixed on the fixed column through a fixing piece; in specific implementation, the charging device may be provided with a plurality of groups of charging devices according to the productivity requirement of the production line, and in some embodiments, a control terminal is additionally provided, a controller is arranged in the control terminal, and photoelectric switch sensors are arranged at corresponding positions on the cross rod 4 and are electrically connected with the controller, and the photoelectric switch sensors, the cylinder, the hydraulic cylinder 18, the conveyor, the motor 903 and the servo motor 804; when the charging device is used, when the conveyor moves the tray to the charging device, the photoelectric switch sensor transmits sensing information to the controller, the controller transmits a starting instruction to the hydraulic cylinder, the hydraulic cylinder descends the top plate 14, the charging connector is used for clamping the electrode of the battery cell 13 for precharging, the charging parameter can be a preset value in a control terminal software program, and specifically can be a PLC programming, and the charging parameter comprises: charging current, charging voltage and charging time.
Specifically, the priming device 100 is provided with at least 5 sets.
Specifically, the vacuum-pumping device 200 is provided with at least 8 groups.
Example 2
As shown in fig. 8, a method for injecting liquid into a lithium battery includes the following steps:
s0: the lithium battery liquid injection system of example 1 is not limited to the liquid injection system of example 1 when the system is embodied;
s1: primary liquid injection: placing the battery cell 13 in the tray, and starting to inject liquid into the battery cell 13 by using the liquid injection device 100, wherein the liquid injection amount is 15% of the capacity of the battery cell;
s2: and (5) vacuumizing once: starting a conveyor, conveying the battery cell 13 after primary liquid injection to a position corresponding to the vacuumizing device 200, starting a vacuum pump, and vacuumizing once, wherein the vacuum pressure value is as follows: -20Kpa, hold for 30s;
s3: and (3) secondary liquid injection: the conveyor continuously transfers the primary vacuumized battery cell to the liquid injection device 100 for secondary liquid injection, and the liquid injection amount is 25% of the battery cell capacity;
s4: and (5) secondary vacuumizing: the conveyor continuously transfers the battery cells after secondary liquid injection to the vacuumizing device 200, a vacuum pump is started for secondary vacuumizing, and the vacuum pressure value is as follows: -70Kpa, hold for 30s;
s5: three liquid injections: the conveyor continuously transfers the battery cell subjected to secondary vacuumizing to the liquid injection device 100 for three liquid injection, and the liquid injection amount is 20% of the capacity of the battery cell;
s6: and (3) vacuumizing for three times: the conveyor continuously transfers the battery cells after three liquid injection to the vacuumizing device 200, a vacuum pump is started for three vacuumizing, the vacuum pressure value is-90 Kpa, and the vacuum pressure value is kept for 30s;
s7: four times of liquid injection: the conveyor continuously transfers the battery cell subjected to three times of vacuumizing to the liquid injection device 100 for four times of liquid injection, wherein the liquid injection amount is 20% of the capacity of the battery cell;
s8: vacuumizing twice in succession: the conveyor continuously transfers battery cells after four times of liquid injection to two side-by-side vacuum pumping devices 200, a vacuum pump is started for secondary vacuum pumping, and the vacuum pressure value is as follows: -98Kpa, hold for 30s;
s9: five injections: the conveyor continuously transfers the battery cell processed in the step S8 to the liquid injection device 100 for five times, and the liquid injection amount is 20% of the capacity of the battery cell;
s10: and vacuumizing again: the conveyor continuously transfers the battery cells processed in the step S9 to the vacuumizing device 200, a vacuum pump is started to vacuumize again, and the vacuum pressure value is as follows: -98Kpa, hold for 30s;
s11: precharging: the conveyor continues to transfer the battery cells processed in the step S9 to the charging device 300, the hydraulic cylinder is started, the top plate descends, the charging connector 15 clamps the electrodes of the battery cells 13, the pre-charging is performed, and the charging current is: 0.1C, charging voltage: 3.0V, charge time: 5min;
s12: vacuumizing twice in succession: the conveyor continuously transfers the battery cells processed in the step S11 to a vacuumizing device, a vacuum pump is started to vacuumize again, the vacuum pressure value is-98 Kpa, and the battery cells are kept for 30S;
s13: sealing and warehousing.
The relative humidity of the liquid injection environment of the liquid injection method is 1%.
The liquid injection environment temperature of the liquid injection method is 25 ℃.
Example 3
As shown in fig. 8, a method for injecting liquid into a lithium battery includes the following steps:
s1: primary liquid injection: placing the battery cell in the tray, and using a liquid injection device, starting liquid injection from the liquid injection head 11 into the battery cell 13, wherein the liquid injection amount is 15% of the capacity of the battery cell;
s2: and (5) vacuumizing once: starting a conveyor, conveying the battery cell 13 after primary liquid injection to a position corresponding to the vacuumizing device 200, starting a vacuum pump, vacuumizing once, and keeping the vacuum pressure value at-25 Kpa for 40s;
s3: and (3) secondary liquid injection: the conveyor continuously transfers the battery cell 13 subjected to primary vacuumizing to a liquid injection device, and the liquid injection head 11 performs secondary liquid injection, wherein the liquid injection amount is 20% of the capacity of the battery cell;
s4: and (5) secondary vacuumizing: the conveyor continuously transfers the battery cells after secondary liquid injection to the vacuumizing device 200, a vacuum pump is started to perform secondary vacuumizing, the vacuum pressure value is-90 Kpa, and the vacuum pressure value is kept for 40 seconds;
s5: three liquid injections: the conveyor continuously transfers the battery cell subjected to secondary vacuumizing to the liquid injection device 100, and the liquid injection head 11 performs three liquid injections, wherein the liquid injection amount is 30% of the capacity of the battery cell;
s6: and (3) vacuumizing for three times: the conveyor continuously transfers the battery cell 13 after three liquid injections to the vacuumizing device 200, a vacuum pump is started for three vacuumizing, the vacuum pressure value is-90 Kpa, and the vacuum pressure is maintained for 40 seconds;
s7: four times of liquid injection: the conveyor continuously transfers the battery cell 13 subjected to three times of vacuumizing to the liquid injection device 100, and the liquid injection head 11 performs four times of liquid injection, wherein the liquid injection amount is 15% of the capacity of the battery cell;
s8: vacuumizing twice in succession: the conveyor continuously transfers battery cells after four times of liquid injection to two vacuumizing devices 200 which are arranged in parallel, a vacuum pump is started to perform secondary vacuumizing, the vacuum pressure value is-98 Kpa, and the vacuum pressure is kept for 40 seconds;
s9: five injections: the conveyor continuously transfers the battery cells processed in the step S8 to the liquid injection device 100, and the liquid injection head 11 performs liquid injection for five times, wherein the liquid injection amount is 20% of the capacity of the battery cells;
s10: and vacuumizing again: the conveyor continuously transfers the battery cells processed in the step S9 to the vacuumizing device 200, a vacuum pump is started to vacuumize again, the vacuum pressure value is-98 Kpa, and the vacuum pressure value is kept for 40S;
s11: precharging: the conveyor continues to transfer the battery cells processed in step S9 to the charging device 300, clamps the electrodes of the battery cells 13 by using the charging connector 15, performs pre-charging, and charges the current: 0.2C, charging voltage: 3.0V, charging time is 6min;
s12: vacuumizing twice in succession: the conveyor continuously transfers the battery cells 13 processed in the step S11 to a vacuumizing device, a vacuum pump is started to vacuumize again, the vacuum pressure value is-98 Kpa, and the vacuum pressure value is kept for 40S;
s13: sealing and warehousing.
The relative humidity of the liquid injection environment of the liquid injection method is 1%.
The liquid injection environment temperature of the liquid injection method is 25 ℃.
Example 4
As shown in fig. 8, a method for injecting liquid into a lithium battery includes the following steps:
s0: the lithium battery liquid injection system of example 1 is provided,
s1: primary liquid injection: placing the battery cell 13 in the tray, and using the liquid injection device 100, starting liquid injection from the liquid injection head 11 into the battery cell 13, wherein the liquid injection amount is 15% of the capacity of the battery cell;
s2: and (5) vacuumizing once: starting a conveyor, conveying the battery cell 13 after primary liquid injection to a position corresponding to the vacuumizing device 200, starting a vacuum pump, vacuumizing once, and keeping the vacuum pressure value at-25 Kpa for 50s;
s3: and (3) secondary liquid injection: the conveyor continuously transfers the battery cell 13 subjected to primary vacuumizing to the liquid injection device 100, and the liquid injection head 11 performs secondary liquid injection, wherein the liquid injection amount is 20% of the capacity of the battery cell;
s4: and (5) secondary vacuumizing: the conveyor continuously transfers the battery cells after secondary liquid injection to the vacuumizing device 200, a vacuum pump is started to perform secondary vacuumizing, the vacuum pressure value is-90 Kpa, and the vacuum pressure value is kept for 50s;
s5: three liquid injections: the conveyor continuously transfers the battery cell 13 subjected to secondary vacuumizing to the liquid injection device 100, and the liquid injection head 11 performs three liquid injections, wherein the liquid injection amount is 30% of the capacity of the battery cell;
s6: and (3) vacuumizing for three times: the conveyor continuously transfers the battery cell 13 after three liquid injections to the vacuumizing device 200, a vacuum pump is started for three vacuumizing, the vacuum pressure value is-90 Kpa, and the vacuum pressure value is kept for 50s;
s7: four times of liquid injection: the conveyor continuously transfers the battery cell 13 subjected to three times of vacuumizing to the liquid injection device 100, and the liquid injection head 11 performs four times of liquid injection, wherein the liquid injection amount is 15% of the capacity of the battery cell;
s8: vacuumizing twice in succession: the conveyor continuously transfers the battery cells 13 after the four times of liquid injection to two vacuumizing devices 200 which are arranged in parallel, a vacuum pump is started to perform secondary vacuumizing, the vacuum pressure value is-98 Kpa, and the vacuum pressure is kept for 50s;
s9: five injections: the conveyor continuously transfers the battery cells processed in the step S8 to the liquid injection device 100, and the liquid injection head 11 performs liquid injection for five times, wherein the liquid injection amount is 20% of the capacity of the battery cells;
s10: and vacuumizing again: the conveyor continuously transfers the battery cells processed in the step S9 to the vacuumizing device 200, a vacuum pump is started to vacuumize again, the vacuum pressure value is-98 Kpa, and the vacuum pressure value is kept for 50S;
s11: precharging: the conveyor continues to transfer the battery cells processed in step S9 to the charging device 300, clamps the electrodes of the battery cells 13 by using the charging connector 15, performs pre-charging, and charges the current: 0.3C, charging voltage: 3.0V, charging time 7min;
s12: vacuumizing twice in succession: the conveyor continuously transfers the battery cells processed in the step S11 to the vacuumizing device 200, a vacuum pump is started to vacuumize again, the vacuum pressure value is-98 Kpa, and the vacuum pressure value is kept for 50S;
s13: sealing and warehousing.
The relative humidity of the liquid injection environment of the liquid injection method is 1%.
The liquid injection environment temperature of the liquid injection method is 25 ℃.
Example 5
This example is a modification of example 3, specifically:
s11: precharging: the conveyor continues to transfer the battery cells 13 processed in step S9 to the charging device 300, clamps the electrodes of the battery cells 13 by using the charging connector 15, performs pre-charging, and charges the current: 0.4C, charging voltage: 3.0V, charging time 7min.
Example 6
This example is a modification of example 3, specifically:
s11: precharging: the conveyor continues to transfer the battery cells processed in step S9 to the charging device 300, clamps the electrodes of the battery cells 13 by using the charging connector 15, performs pre-charging, and charges the current: 0.5C, charging voltage: 3.0V, charging time 7min.
Comparative example
Step S11 of example 2 is removed, and the battery cells after the liquid injection are subjected to a cycle test, and the test data are shown in table 1, otherwise the same as example 2;
the cyclic test method comprises the following steps: charging was performed at 25C in a constant voltage charging manner, a limiting current was 9A, a termination voltage was 3.65V, discharging was performed in a constant current discharging manner, a discharging current was 180A, a cutoff voltage of discharging was 2.5V, battery capacities C1 and C2 after 500 cycles and 1000 cycles were recorded, respectively, and capacity retention rates R after 500 cycles and 1000 cycles were calculated 1 st.
R 500 =c1/initial capacity x 100%;
R 1000 =c2/initial capacity x 100%.
TABLE 1 Capacity Retention Rate of samples of examples 2-6 and comparative examples
| Sample preparation | R 500 | R 1000 |
| Example 2 | 95.57％ | 92.54％ |
| Example 3 | 96.06％ | 92.59％ |
| Example 4 | 94.37％ | 91.84％ |
| Example 5 | 94.87％ | 92.01％ |
| Example 6 | 95.14％ | 91.47％ |
| Comparative example | 90.81％ | 83.45％ |
As can be seen from Table 1, the capacity retention rates of examples 2 to 6 for 500 cycles and 1000 cycles are higher than those of the comparative example, and the capacity retention rates of example 3 for 500 cycles and 1000 cycles are as high as 96.06% and 92.59%, respectively, and the capacity loss is smaller than that of the comparative example, so that the battery cell produced by the liquid injection method of the present invention has high capacity and excellent quality.
The above embodiments only describe the optimal use of the existing apparatus, but similar common mechanical means are used to replace the elements in the present embodiment, which all fall within the scope of protection.
Claims (10)
1. Lithium cell annotates liquid system, including conveyer and be used for fixed work frame (16) of this conveyer, its characterized in that: the system also comprises a liquid injection device (100), a charging device (300) and a vacuumizing device (200), wherein trays (12) are arranged on the conveying belt (1) of the conveyor at intervals; a plurality of battery cells (13) are arranged on the tray (12);
the liquid injection device (100) comprises a liquid injection frame (9), a moving mechanism is fixed below the liquid injection frame (9) through a connecting block (901), the moving mechanism comprises a moving screw rod (902), one end of the moving screw rod (902) is connected with a motor (903), a moving frame (10) is connected to the moving screw rod (902) in a threaded mode, the moving frame (10) is connected with a plurality of liquid injection heads (11), the liquid injection heads (11) are connected to a liquid injection pump through hoses, and an electrolyte tank is connected to the inlet end of the liquid injection pump; the liquid injection head corresponds to the battery cell (13);
the vacuum pumping device (200) comprises a fixing frame, wherein the fixing frame comprises a fixing plate (2), an air cylinder (3) is arranged at the top of the fixing plate (2), a telescopic end (6) of the air cylinder (3) penetrates through the fixing plate (2) and is connected with a vacuum cover (7), the vacuum cover (7) is connected with a vacuum pump through a pipeline, a support column (5) is arranged at the lower end of the fixing plate (2), and the support column (5) is fixed with the working frame (16);
a cross rod (4) is fixed above the liquid injection frame (9), and a plurality of guide devices (8) are arranged on the upper surface of the cross rod (4); the cross rod (4) is movably arranged at two ends of the upright post of the working frame (16); the guide device (8) comprises a sliding block (801) arranged on the upper surface of the cross rod (4), the sliding block (801) is in threaded connection with a screw rod (803), the screw rod (803) is fixed on the cross beam of the working frame (16), and one end of the screw rod (803) is connected with a servo motor (804);
the charging device (300) comprises a top plate (14), a charging connector (15) for charging the battery cell (13) is arranged on the top plate (14), and a lifting mechanism is further arranged above the top plate (14) and is fixed on the working frame (16);
the liquid injection head (11) comprises a needle body, the needle body is provided with a needle head (1101) for aligning with a liquid injection port of a battery cell and a needle tail (1102) connected with the hose, the needle head (1101) is provided with a liquid outlet, the needle tail (1102) is provided with a liquid inlet, an infusion channel (1103) communicated with the liquid outlet and the liquid inlet is arranged in the needle body, and a buffer structure (1104) is arranged on the side wall of the infusion channel (1103) close to the position of the needle head;
the liquid injection method further comprises the following steps:
s1: primary liquid injection: placing the battery cell in a tray, and using a liquid injection device (100), wherein liquid injection is started from a liquid injection head (11) to the inside of the battery cell (13), and the liquid injection amount is 5-20% of the capacity of the battery cell;
s2: and (5) vacuumizing once: starting a conveyor, conveying the battery cells after primary liquid injection to the corresponding positions of the vacuumizing device, starting a vacuum pump, vacuumizing once, setting a vacuum pressure value, and keeping for 30-50s;
s3: and (3) secondary liquid injection: the conveyor continuously transfers the battery cell (13) subjected to primary vacuumizing to the position of the liquid injection device (100), and the liquid injection head (11) performs secondary liquid injection, wherein the liquid injection amount is 10-20% of the capacity of the battery cell;
s4: and (5) secondary vacuumizing: the conveyor continuously transfers the battery cell (13) after the secondary liquid injection to the vacuumizing device (200), a vacuum pump is started to perform secondary vacuumizing, a vacuum pressure value is set, and the vacuum pressure value is kept for 30-50s;
s5: three liquid injections: the conveyor continuously transfers the battery cell (13) subjected to secondary vacuumizing to the position of the liquid injection device (100), and the liquid injection head (11) performs three-time liquid injection, wherein the liquid injection amount is 20-30% of the capacity of the battery cell;
s6: and (3) vacuumizing for three times: the conveyor continuously transfers the battery cell (13) after three liquid injection to the vacuumizing device (200), a vacuum pump is started for three vacuumizing, a vacuum pressure value is set, and the vacuum pressure value is kept for 30-50s;
s7: four times of liquid injection: the conveyor continuously transfers the battery cell (13) subjected to three times of vacuumizing to the liquid injection device (100), and the liquid injection head (11) performs four times of liquid injection, wherein the liquid injection amount is 10-20% of the capacity of the battery cell;
s8: vacuumizing twice in succession: the conveyor continuously transfers the battery cells (13) after four times of liquid injection to two vacuumizing devices (200) which are arranged in parallel, a vacuum pump is started for secondary vacuumizing, a vacuum pressure value is set, and the battery cells are kept for 30-50s;
s9: five injections: the conveyor continuously transfers the battery cell (13) processed in the step S8 to the liquid injection device (100), and the liquid injection head (11) carries out liquid injection for five times, wherein the liquid injection amount is 10-20% of the capacity of the battery cell;
s10: and vacuumizing again: the conveyor continuously transfers the battery cell (13) processed in the step S9 to a vacuumizing device (200), a vacuum pump is started to vacuumize again, a vacuum pressure value is set, and the vacuum pressure value is kept for 30-50S;
s11: precharging: the conveyor continuously transfers the battery cell (13) processed in the step S9 to the charging device (300), the charging connector (15) is used for clamping the electrode of the battery cell, the pre-charging is carried out, and the charging current is: 0.1-0.5C, charging voltage: 2.75-3.0V, charging time: 5-7min;
s12: vacuumizing twice in succession: the conveyor continuously transfers the battery cell (13) processed in the step S11 to a vacuumizing device (200), a vacuum pump is started to vacuumize again, and a vacuum pressure value is set and kept for 30-50S;
s13: sealing and warehousing;
wherein, the vacuum pressure value in S2 is-20 Kpa, and the vacuum pressure value in S4 is: the vacuum pressure values in 70kpa, S6 are-90 kpa, and the vacuum pressure values in S8, S10, S12 are all: -98Kpa;
or;
wherein, the vacuum pressure value in S2 is-25 Kpa, and the vacuum pressure value in S4 is: the vacuum pressure values in-90 kpa, S6 are-90 kpa, and the vacuum pressure values in S8, S10, S12 are all: -98Kpa.
2. The lithium battery electrolyte injection system of claim 1, wherein: the buffer structure (1104) is a buffer groove which is concavely arranged on the inner wall of the infusion channel in an annular shape.
3. The lithium battery electrolyte injection system according to claim 2, wherein: the buffer groove is of a thread structure or a wave crest structure with the diameter gradually reduced along the liquid flow direction.
4. The lithium battery electrolyte injection system of claim 1, wherein: the opening end of the vacuum cover (7) is provided with a sealing ring.
5. The lithium battery electrolyte injection system of claim 1, wherein: the lifting mechanism is a pneumatic driving component and/or a hydraulic driving component and/or an electric driving component.
6. The lithium battery electrolyte injection system of claim 1, wherein: the priming device (100) is provided with at least 5 sets.
7. The lithium battery electrolyte injection system of claim 1, wherein: the vacuumizing device (200) is at least provided with 8 groups.
8. A liquid injection method of a lithium battery is characterized in that: comprises the following steps:
s1: primary liquid injection: placing the battery cell in a tray, and using a liquid injection device (100), wherein liquid injection is started from a liquid injection head (11) to the inside of the battery cell (13), and the liquid injection amount is 5-20% of the capacity of the battery cell;
s2: and (5) vacuumizing once: starting a conveyor, conveying the battery cells after primary liquid injection to the corresponding positions of the vacuumizing device, starting a vacuum pump, vacuumizing once, setting a vacuum pressure value, and keeping for 30-50s;
s3: and (3) secondary liquid injection: the conveyor continuously transfers the battery cell (13) subjected to primary vacuumizing to the position of the liquid injection device (100), and the liquid injection head (11) performs secondary liquid injection, wherein the liquid injection amount is 10-20% of the capacity of the battery cell;
s4: and (5) secondary vacuumizing: the conveyor continuously transfers the battery cell (13) after the secondary liquid injection to the vacuumizing device (200), a vacuum pump is started to perform secondary vacuumizing, a vacuum pressure value is set, and the vacuum pressure value is kept for 30-50s;
s5: three liquid injections: the conveyor continuously transfers the battery cell (13) subjected to secondary vacuumizing to the position of the liquid injection device (100), and the liquid injection head (11) performs three-time liquid injection, wherein the liquid injection amount is 20-30% of the capacity of the battery cell;
s6: and (3) vacuumizing for three times: the conveyor continuously transfers the battery cell (13) after three liquid injection to the vacuumizing device (200), a vacuum pump is started for three vacuumizing, a vacuum pressure value is set, and the vacuum pressure value is kept for 30-50s;
s7: four times of liquid injection: the conveyor continuously transfers the battery cell (13) subjected to three times of vacuumizing to the liquid injection device (100), and the liquid injection head (11) performs four times of liquid injection, wherein the liquid injection amount is 10-20% of the capacity of the battery cell;
s8: vacuumizing twice in succession: the conveyor continuously transfers the battery cells (13) after four times of liquid injection to two vacuumizing devices (200) which are arranged in parallel, a vacuum pump is started for secondary vacuumizing, a vacuum pressure value is set, and the battery cells are kept for 30-50s;
s9: five injections: the conveyor continuously transfers the battery cell (13) processed in the step S8 to the liquid injection device (100), and the liquid injection head (11) carries out liquid injection for five times, wherein the liquid injection amount is 10-20% of the capacity of the battery cell;
s10: and vacuumizing again: the conveyor continuously transfers the battery cell (13) processed in the step S9 to a vacuumizing device (200), a vacuum pump is started to vacuumize again, a vacuum pressure value is set, and the vacuum pressure value is kept for 30-50S;
s11: precharging: the conveyor continuously transfers the battery cell (13) processed in the step S9 to the charging device (300), the charging connector (15) is used for clamping the electrode of the battery cell, the pre-charging is carried out, and the charging current is: 0.1-0.5C, charging voltage: 2.75-3.0V, charging time: 5-7min;
s12: vacuumizing twice in succession: the conveyor continuously transfers the battery cell (13) processed in the step S11 to a vacuumizing device (200), a vacuum pump is started to vacuumize again, and a vacuum pressure value is set and kept for 30-50S;
s13: sealing and warehousing;
wherein, the vacuum pressure value in S2 is-20 Kpa, and the vacuum pressure value in S4 is: the vacuum pressure values in 70kpa, S6 are-90 kpa, and the vacuum pressure values in S8, S10, S12 are all: -98Kpa;
or;
wherein, the vacuum pressure value in S2 is-25 Kpa, and the vacuum pressure value in S4 is: the vacuum pressure values in-90 kpa, S6 are-90 kpa, and the vacuum pressure values in S8, S10, S12 are all: -98Kpa.
9. The method for injecting liquid into a lithium battery according to claim 8, wherein: the relative humidity of the liquid injection environment of the liquid injection method is less than or equal to 1 percent.
10. The method for injecting liquid into a lithium battery according to claim 9, wherein: the liquid injection environment temperature of the liquid injection method is 22-28 ℃.
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| CN115064848A (en) * | 2022-06-27 | 2022-09-16 | 鹤壁市诺信电子有限公司 | Liquid injection device and liquid injection method for lithium battery |
| CN115621563B (en) * | 2022-12-20 | 2023-03-10 | 广东正德工业科技股份有限公司 | Novel lithium cell production facility is annotated in automation of low consumption energy-conservation |
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