CN112736321B - Cooling device for lithium ion cell liquid injection and liquid injection method - Google Patents
Cooling device for lithium ion cell liquid injection and liquid injection method Download PDFInfo
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- CN112736321B CN112736321B CN202011642673.9A CN202011642673A CN112736321B CN 112736321 B CN112736321 B CN 112736321B CN 202011642673 A CN202011642673 A CN 202011642673A CN 112736321 B CN112736321 B CN 112736321B
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- 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
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/613—Cooling or keeping cold
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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
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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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
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/655—Solid structures for heat exchange or heat conduction
- H01M10/6556—Solid parts with flow channel passages or pipes for heat exchange
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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
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
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- H01M10/6563—Gases with forced flow, e.g. by blowers
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- H—ELECTRICITY
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- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
- H01M10/6569—Fluids undergoing a liquid-gas phase change or transition, e.g. evaporation or condensation
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Abstract
A cooling device and a liquid injection method for lithium ion cell liquid injection belong to the technical field of lithium ion cell liquid injection, wherein the cooling device comprises a cooling shell, a condenser pipe, a water cooler, a water pump I and a water pump II, a plurality of lithium ion cells are stored in the cooling shell, the condenser pipe is wound outside the cooling shell, the water inlet end of the condenser pipe is connected with the water outlet of the water cooler through the water pump I, and the water outlet end of the condenser pipe is connected with the water inlet of the water cooler through the water pump II, wherein the liquid injection method uses the cooling device to sequentially perform primary liquid injection, formation aging and secondary liquid injection, the cooling device has the advantages of simple integral structure, low modification cost, accelerated cooling of the lithium ion cells, and the cooling device is combined to perform process adjustment on the traditional liquid injection method, so that the liquid injection is more stable, and the liquid injection efficiency of the battery cell is improved, the quality of the battery cell is improved.
Description
Technical Field
The invention relates to the technical field of lithium ion cell liquid injection, in particular to a cooling device and a liquid injection method for lithium ion cell liquid injection.
Background
The lithium ion cell is a secondary cell capable of being repeatedly charged and discharged and is composed of main components such as cathode and anode plates, a separation film, electrolyte, mechanical parts and the like. In the whole life cycle process of the lithium ion battery cell, particularly in the process of researching the production and manufacturing of the battery cell, liquid is required to be replenished after the liquid lithium ion battery cell is subjected to primary liquid injection and formation aging after being baked. However, the battery cell is at a relatively high temperature after baking or after formation and aging, that is, a positive pressure exists inside the battery cell, which causes difficulty in liquid injection or liquid spraying of the battery cell, and the conventional method is to allow the battery cell to spontaneously combust and cool after standing for a period of time before liquid injection, so that the following inevitable disadvantages are caused: 1. the production efficiency of the battery cell is reduced; 2. the storage pressure of a temporary battery cell placement area of the liquid injection room is increased; 3. the quality control risk in the battery cell storage process is increased.
Disclosure of Invention
In order to solve the technical problems, the invention provides a cooling device and a liquid injection method for lithium ion cell liquid injection, wherein the cooling device has a simple integral structure and low modification cost, can accelerate the cooling of a lithium ion cell, and is combined with the cooling device to adjust and improve the traditional liquid injection method, so that the liquid injection efficiency of a cell is improved.
In order to achieve the purpose, the technical scheme adopted by the invention for solving the technical problems is as follows: lithium ion cell annotates liquid and uses cooling device, including cooling shell, condenser pipe, cold water machine, water pump I and water pump II, deposit a plurality of lithium ion cell in the cooling shell, the outer winding of cooling shell has the condenser pipe, the income water end of condenser pipe pass through water pump I with the delivery port of cold water machine links to each other, the play water end of condenser pipe pass through water pump II with the water inlet of cold water machine links to each other.
Furthermore, the periphery direction of the cooling shell is provided with a spiral positioning groove, and the spiral positioning groove is matched with the condensation pipe in a clamping mode.
Further, the notch of the spiral positioning groove faces outwards, and the width of the notch of the spiral positioning groove is smaller than the outer diameter of the condensation pipe.
Furthermore, flow control valves are respectively installed at the water inlet end and the water outlet end of the condensation pipe.
The liquid injection method of the lithium ion battery cell uses the cooling device and comprises the following steps:
1) primary liquid injection: placing the baked lithium ion battery cell into a cooling shell filled with circulating condensed water, transferring the lithium ion battery cell into the cooling shell in a primary liquid injection machine after air cooling for a period of time in a drying room, standing for a period of time, pumping negative pressure, injecting 60-85% of the total amount of the electrolyte of the primary liquid injection, transferring the lithium ion battery cell into the cooling shell filled with the circulating condensed water, standing for a period of time, and injecting the rest of the total amount of the electrolyte of the primary liquid injection at positive pressure;
2) formation and aging: pre-charging the lithium ion battery cell after primary liquid injection, and then standing for a period of time;
3) secondary liquid injection: and transferring the aged lithium ion battery cell to a cooling shell which is filled with circulating condensed water in a secondary liquid injection machine, standing for a period of time, and injecting all electrolyte of secondary liquid injection once after negative pressure is pumped.
Further, in the step 1), the temperature range of the baked lithium ion battery cell is 80-120 ℃, the baked lithium ion battery cell is placed into a cooling shell filled with circulating condensed water, and after the lithium ion battery cell is air-cooled in a drying room for 30-45 min, the temperature of the lithium ion battery cell is reduced to 40-50 ℃; standing for 20-30 min after primary liquid injection, and reducing the temperature of the lithium ion battery cell to 20-30 ℃.
Further, in the step 1), the range of negative pressure extraction before the first liquid injection is-60 kPa to-100 kPa, the range of pressure for injecting the residual electrolyte under positive pressure is 5kPa to 30kPa, and the rest is kept for 5 to 10min after injecting the residual electrolyte under positive pressure.
Further, in the step 2), after the liquid injection port of the lithium ion cell needs to be plugged before the lithium ion cell after primary liquid injection is precharged, the sealed lithium ion cell is kept still for 18-24 hours under the conditions that the humidity is 0-2.0% and the temperature is 40-50 ℃; the process of pre-charging the lithium ion cell after standing comprises primary pre-charging and secondary pre-charging, wherein the primary pre-charging is carried out for 0.20-0.30 h under the condition of 0.05-0.1C, the total charging amount is 1-3%, the secondary pre-charging is carried out for 2-3 h under the condition of 0.1-0.15C, the total charging amount is 20-45%, and the negative pressure in the lithium ion cell after pre-charging is tested to be-5-10 kPa.
Further, in the step 2), the voltage of the lithium ion battery cell after the pre-charging is stabilized at 3.30-3.33V after the lithium ion battery cell is kept stand for 16-20 hours under the conditions that the temperature is 40-50 ℃ and the humidity is 0-2.0%.
Further, in the step 3), the temperature of the aged lithium ion battery core is 40-50 ℃, the lithium ion battery core is conveyed to a secondary liquid injection machine through a conveyor belt, the battery core is cooled in an air cooling mode through an air conditioner in the conveying process of the conveyor belt, then the temperature is reduced to 20-25 ℃ after the battery core is kept still in a cooling shell in the secondary liquid injection machine for 10-20 min, and all electrolyte in the secondary liquid injection is injected once after negative pressure of minus 60kPa to minus 100kPa is pumped.
The invention has the beneficial effects that:
1. according to the invention, the original battery cell clamp is improved, the condenser pipe is wound outside the cooling shell, two ends of the condenser pipe are respectively connected with the water chiller through the water pump, and circulating condensate water is introduced into the condenser pipe through the water chiller, so that the battery cell can be cooled in the standing and liquid injection processes, the liquid injection time is shortened, and the liquid injection efficiency is improved.
2. In the process of injecting liquid into the lithium ion battery cell, the battery cell is placed in the cooling device before primary liquid injection and is cooled in the drying room in an air cooling mode, so that the cooling of the battery cell is accelerated, the time of primary liquid injection can be shortened, and in the process of transferring the battery cell to secondary liquid injection after formation and aging, the temperature of the battery cell in the cooling device is reduced in an auxiliary manner of air cooling of an air conditioner in the conveying process of a conveying belt, so that the time of secondary liquid injection can be shortened; and at the in-process of once annotating liquid and secondary notes liquid, use above-mentioned cooling device to make electric core stew and annotate the liquid and go on step by step in proper order, can make electrolyte fully soak, make and annotate the liquid more stable, inject into through taking out negative pressure and malleation respectively to electric core and carry out the step by step and annotate the liquid, prevented that electric core internal pressure is too high in earlier stage and arouse the problem of hydrojet, improved the notes liquid efficiency in later stage simultaneously.
In conclusion, the cooling device disclosed by the invention is simple in integral structure and low in modification cost, and can accelerate the cooling of the lithium ion battery cell, and the cooling device is combined to carry out process adjustment on the traditional electrolyte injection method, so that the electrolyte injection is more stable, the electrolyte injection efficiency of the battery cell is improved, and the quality of the battery cell is improved.
Drawings
The contents of the expressions in the various figures of the present specification and the labels in the figures are briefly described as follows:
FIG. 1 is a schematic view of a cooling apparatus according to the present invention;
FIG. 2 is a schematic view of the engagement between the spiral positioning groove and the condensation pipe in FIG. 1;
the labels in the above figures are: 1. the cooling device comprises a cooling shell, 11 spiral positioning grooves, 2 condensation pipes, 3 water coolers, 4 water pumps I, 5 water pumps II, 6 lithium ion batteries and 7 flow control valves.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and the following embodiments are used for illustrating the present invention and are not intended to limit the scope of the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The specific implementation scheme of the invention is as follows: as shown in figure 1, a cooling device for lithium ion core liquid injection comprises a cooling shell 1, a condenser pipe 2, a water cooler 3, a water pump I4 and a water pump II 5, wherein the cooling shell 1 can be set to be a hollow structure, a plurality of lithium ion cores 6 are stored in the cooling shell 1, the condenser pipe 2 is wound outside the cooling shell 1, the water inlet end of the condenser pipe 2 is connected with the water outlet of the water cooler 3 through the water pump I4, the water outlet end of the condenser pipe 2 is connected with the water inlet of the water cooler 3 through the water pump II 5, circulating condensation is performed on inflowing water through the water cooler, circulating condensation water is introduced into the condenser pipe 2 through the water pump I4 and flows in the condenser pipe 2, heat on the cooling shell 1 can be taken away, the condensed water enters the water cooler 3 under the action of the water pump II 5 for circulating condensation after being heated, the outlet temperature of the condensed water in the water cooler 3 can be adjusted according to needs, the battery cell can be cooled in the standing and liquid injection processes, the liquid injection time is shortened, and the liquid injection efficiency is improved.
Specifically, as shown in fig. 2, the peripheral direction of the cooling housing 1 is provided with a spiral positioning groove 11, the spiral positioning groove 11 is engaged with the condensation tube 2, and the specific structure is that the notch of the spiral positioning groove 11 faces outward and the width of the notch of the spiral positioning groove 11 is smaller than the outer diameter of the condensation tube 2, the condensation tube 2 is a flexible plastic tube, which can be pressed and deformed, the condensation tube 2 can be pressed inward by the notch of the spiral positioning groove 11 manually until the condensation tube 2 completely enters the spiral positioning groove 11, because the width of the notch of the spiral positioning groove 11 is smaller than the outer diameter of the condensation tube 2, when circulating condensed water is introduced into the condensation tube 2, the condensation tube 2 expands to be closely attached to the spiral positioning groove 11, so that the contact area between the condensation tube 2 and the cooling housing 1 is larger, the cooling effect is improved, and the installation of the condensation tube 2 is more convenient, the dropping of the condensation pipe 2 is prevented, and the structure of the wound condensation pipe 2 is more stable.
Specifically, as shown in fig. 1, flow control valves 7 are respectively installed at a water inlet end and a water outlet end of the condenser tube 2, and the speed of circulating condensed water flowing through the cooling housing 1 can be adjusted by controlling the opening degrees of the two flow control valves 7, so that the cooling efficiency of the battery cell can be adjusted.
The method for injecting the lithium ion battery cell by using the cooling device comprises the following steps:
1) primary liquid injection: and placing the baked lithium ion cell 6 into a cooling shell 1 filled with circulating condensate water, wherein the temperature range of the baked lithium ion cell 6 is 80-120 ℃, after the baked lithium ion cell 6 is placed into the cooling shell 1 filled with the circulating condensate water and air-cooled in a drying room for 30-45 min, the temperature of the lithium ion cell 6 is reduced to 40-50 ℃, after negative pressure is pumped to minus 60-minus 100kPa, 60-85% of the total amount of the electrolyte injected into the primary injection liquid is injected, after the lithium ion cell is transferred into the cooling shell 1 filled with the circulating condensate water and stands for 20-30 min, the temperature of the lithium ion cell 6 is reduced to 20-30 ℃, then the rest part of the total amount of the electrolyte injected into the primary injection liquid is injected at the positive pressure of 5-30 kPa, and then stands for 5-10 min.
2) Formation and aging: plugging a liquid injection port of the lithium ion cell 6 subjected to primary liquid injection, and standing the lithium ion cell 6 subjected to sealing for 18-24 hours under the conditions that the humidity is 0-2% and the temperature is 40-50 ℃; pre-charging the lithium ion cell 6 after standing, wherein the pre-charging comprises primary pre-charging and secondary pre-charging, the primary pre-charging condition is 0.05-0.1 ℃, the charging time is 0.2-0.30 h and the total charging amount is 1-3%, the secondary pre-charging condition is 0.1-0.15 ℃, the charging time is 2-3 h and the total charging amount is 20-45%, and the negative pressure in the lithium ion cell 6 after pre-charging is tested to be-5 to-10 kPa; and after the lithium ion battery cell 6 after the pre-charging is kept stand for 16-20 hours under the conditions that the temperature is 40-50 ℃ and the humidity is 0-2%, the voltage is stabilized at 3.30-3.33V.
3) Secondary liquid injection: the temperature of the aged lithium ion battery cell 6 is 40-50 ℃, the lithium ion battery cell is conveyed to a secondary liquid injection machine through a conveyor belt, the battery cell is cooled in an air-conditioning air-cooling mode in the conveying process of the conveyor belt, then the temperature is reduced to 20-25 ℃ after the lithium ion battery cell is kept still in a cooling shell 1 of the secondary liquid injection machine for 10-20 min, and all electrolyte of secondary liquid injection is injected once after negative pressure of minus 60-minus 100kPa is pumped out.
Example 1
A30 Ah lithium iron phosphate aluminum shell battery cell is used as an experimental sample battery cell, and 48 battery cells which are just baked are selected for an experiment at a time.
The experiment comprises the following specific steps:
1. putting 48 battery cores into the cooling shell 1, inserting a temperature-sensing line probe at a liquid injection hole of each battery core (ensuring that the probe is inserted into a gap at the upper end of the battery core and is suspended without contacting other components of the battery core, and fixing the temperature-sensing line by using an adhesive tape outside), connecting the temperature-sensing line with a multi-path temperature measuring instrument, and measuring the internal initial temperature of the battery core to be 92-98 ℃; circulating condensed water is introduced into a condensed water pipe of the clamp, wherein the condensed water is ice water with the temperature of about 0-5 ℃, the condensed water is condensed for 30-35 min, and the internal temperature of the lithium ion battery core is reduced to 40-45 ℃ after the lithium ion battery core is kept still.
2. Transferring the 48 stood battery cores into a cooling shell 1 at a standing position of a primary liquid injection machine, introducing circulating condensed water into the cooling shell 1, and standing for 20-25 min, wherein the temperature of the battery cores is reduced to 20-25 ℃.
3. Removing the temperature sensing line, moving the battery core to a liquid injection position of a primary liquid injection machine for injection, firstly pumping negative pressure of minus 60kPa to minus 100kPa, then injecting 80g to 95g of electrolyte, then transferring the electrolyte into a cooling shell 1 at a static position, connecting the temperature sensing line, introducing condensed water, standing for 20 to 25min, and reducing the temperature to 20 to 25 ℃; then moving to the liquid injection position, firstly pressurizing to 5 kPa-30 kPa, and then injecting 32.5 g-47.5 g of electrolyte with one-time liquid injection amount; and then moving the lithium ion battery to a standing position in the cooling shell 1 to stand for 5-8 min, stabilizing the electrolyte injected firstly, reducing the temperature of the lithium ion battery cell to 15-20 ℃, and ensuring that the average time consumed by one-time injection of each battery cell is 75-93 min.
4. Plugging liquid injection ports of 48 battery cells 6 subjected to primary liquid injection, and standing the sealed lithium ion battery cells 6 for 20 hours under the conditions that the humidity is 0-2% and the temperature is 40-50 ℃; pre-charging the lithium ion battery cell 6 after standing, wherein the pre-charging comprises primary pre-charging and secondary pre-charging, the primary pre-charging condition is 0.1C, the charging time is 0.30h and the charging amount is 3%, the secondary pre-charging condition is 0.15C, the charging time is 2h and the charging amount is 30%, and the negative pressure in the lithium ion battery cell 6 after pre-charging is tested to be-8 kPa; and after the lithium ion battery cell 6 after the pre-charging is kept stand for 18 hours under the conditions that the temperature is 40-50 ℃ and the humidity is 0-2%, the voltage is stabilized at 3.30-3.33V.
5. Putting 48 aged cells into the cooling shell 1, inserting a temperature-sensing line probe at a liquid injection hole of each cell (ensuring that the probe is inserted into a gap at the upper end of the cell and is suspended without contacting other components of the cell, and fixing a temperature-sensing line outside by using an adhesive tape), connecting the temperature-sensing line with a multi-path temperature measuring instrument, and measuring the initial temperature inside the cell to be 45-50 ℃; circulating condensed water is introduced into the cooling shell 1, the condensed water is ice water with the temperature of 0-5 ℃, the ice water is transmitted to a secondary liquid injection machine through a conveyor belt, the electric core is cooled in the air cooling mode of an air conditioner in the conveying process of the conveyor belt, and then the electric core is kept stand in the cooling shell 1 of the secondary liquid injection machine for 10-13 min, and the temperature is reduced to 20-25 ℃;
6. and (3) transferring the 48 stood battery cores to a liquid injection position of a secondary liquid injection machine for injection, firstly pumping negative pressure of minus 60kPa to minus 100kPa, and then injecting 20g to 25g of electrolyte, thus completing secondary liquid injection, wherein the average time consumption of the secondary liquid injection of each battery core is 10 to 13 min.
Example 2
The 135Ah lithium iron phosphate cell is used as an experimental sample cell, and 48 cells which are just baked are selected for use as an experiment at one time.
The experiment comprises the following specific steps:
1. putting 48 battery cores into the cooling shell 1, inserting a temperature-sensing line probe at a liquid injection hole of each battery core (ensuring that the probe is inserted into a gap at the upper end of the battery core and is suspended without contacting other components of the battery core, and fixing the temperature-sensing line by using an adhesive tape outside), connecting the temperature-sensing line with a multi-path temperature measuring instrument, and measuring the internal initial temperature of the battery core to be 100-110 ℃; circulating condensed water is introduced into a condensed water pipe of the clamp, wherein the condensed water is ice water with the temperature of about 0-5 ℃, the condensed water is condensed and kept stand for 30-45 min, and the internal temperature of the lithium ion battery core is reduced to 45-50 ℃ after the lithium ion battery core is kept stand.
2. Transferring the 48 stood battery cores into a cooling shell 1 at a standing position of a primary liquid injection machine, introducing circulating condensed water into the cooling shell 1, and standing for 25-30 min, wherein the temperature of the battery cores is reduced to 25-30 ℃.
3. Removing the temperature sensing line, moving the battery core to a liquid injection position of a primary liquid injection machine for injection, firstly pumping negative pressure of minus 80 to minus 95kPa, then injecting 370 to 390g of electrolyte, then transferring the electrolyte into a cooling shell 1 at a static position, connecting the temperature sensing line, introducing condensed water, standing for 20 to 25min, and reducing the temperature to 23 to 28 ℃; then moving to a liquid injection position, pressurizing by 20-30 kPa, and injecting 100-110 g of electrolyte with one-time liquid injection amount; and then moving the lithium ion battery to a standing position in the cooling shell 1 to stand for 5-10 min, stabilizing the electrolyte injected firstly, reducing the temperature of the lithium ion battery cell to 20-25 ℃, and ensuring that the average time consumed by one-time injection of each battery cell is 80-120 min.
4. Plugging liquid injection ports of 48 battery cells 6 subjected to primary liquid injection, and standing the sealed lithium ion battery cells 6 for 19 hours under the conditions that the humidity is 0-2% and the temperature is 40-50 ℃; pre-charging the lithium ion battery cell 6 after standing, wherein the pre-charging comprises primary pre-charging and secondary pre-charging, the primary pre-charging condition is 0.1C, the charging time is 0.3h and the charging amount is 3%, the secondary pre-charging condition is 0.15C, the charging time is 2h and the charging amount is 30%, and the negative pressure in the lithium ion battery cell 6 after pre-charging is tested to be-8 kPa; and after the lithium ion battery cell 6 after the pre-charging is placed still for 18 hours under the conditions that the temperature is 43-50 ℃ and the humidity is 0-2%, the voltage is stabilized at 3.30-3.33V.
5. Putting 48 aged cells into the cooling shell 1, inserting a temperature-sensing line probe at a liquid injection hole of each cell (ensuring that the probe is inserted into a gap at the upper end of the cell and is suspended without contacting other components of the cell, and fixing a temperature-sensing line outside by using an adhesive tape), connecting the temperature-sensing line with a multi-path temperature measuring instrument, and measuring the initial temperature inside the cell to be 45-50 ℃; circulating condensed water is introduced into the cooling shell 1, the condensed water is ice water with the temperature of 0-5 ℃, the ice water is transmitted to a secondary liquid injection machine through a conveyor belt, the temperature of the battery cell is reduced in the conveying process of the conveyor belt in an air-conditioning air-cooling mode, and then the temperature is reduced to 23-28 ℃ after the battery cell is kept stand in the cooling shell 1 in the secondary liquid injection machine for 15-20 min;
6. and (3) transferring the 48 stood battery cores to a liquid injection position of a secondary liquid injection machine for injection, firstly pumping negative pressure of minus 60 to minus 100kPa, and then injecting 120 to 130g of electrolyte, thus completing secondary liquid injection, wherein the average time consumption of the secondary liquid injection of each battery core is 15 to 20 min.
Comparative example 1:
a30 Ah lithium iron phosphate aluminum shell battery cell is used as an experimental sample battery cell, and 48 battery cells which are just baked are selected for an experiment at a time.
The specific steps of the primary injection experiment are as follows:
1. putting 48 electric cores into a common fixture, placing the fixture in a standing area of a drying room, inserting a temperature sensing line probe at a liquid injection hole of each electric core (ensuring that the probe is inserted into a gap at the upper end of the electric core and is suspended without contacting other electric core components, fixing the temperature sensing line outside by using an adhesive tape), connecting the temperature sensing line with a multi-path thermodetector, measuring the initial temperature inside the electric core to be 92-98 ℃, standing for 60-65 min, and reducing the internal temperature of the electric core to be 40-45 ℃ after standing.
2. And (3) transferring the 48 stood battery cores to a standing position of a liquid injection machine, standing for 40-45 min, and reducing the temperature of the battery cores to 20-30 ℃.
3. Removing the temperature sensing line, moving the battery core to a liquid injection position for liquid injection, pumping negative pressure to minus 60kPa to minus 100kPa, injecting 80g to 95g of electrolyte with one-time liquid injection amount, transferring to a standing position temperature sensing line, standing for 30 to 35min, and reducing the temperature to 18 ℃ to 23 ℃; then moving to the liquid injection position, firstly pressurizing to 5 kPa-30 kPa, and then injecting 20 g-30 g of electrolyte with one-time liquid injection amount; then transferring to a standing position temperature-sensing line, standing for about 20-25 min, and reducing the temperature to 18-23 ℃; moving to a liquid injection position, pumping negative pressure of minus 20kPa to minus 50kPa, and then injecting 5g to 15g of electrolyte with one-time liquid injection amount; transferring to a standing position temperature-sensitive line, standing for 10-15 min, and reducing the temperature to 17-20 ℃; moving to a liquid injection position, firstly pressurizing to 5 kPa-30 kPa, and then injecting 2 g-10 g of electrolyte with one-time liquid injection amount; and then moving the lithium ion battery to a standing position in the cooling shell 1, standing for 5-8 min, stabilizing the electrolyte injected firstly, reducing the temperature of the lithium ion battery cell to 15-18 ℃, and taking 165-193 min as the average time of one-time injection of each battery cell.
Comparative example 2:
a30 Ah lithium iron phosphate aluminum shell battery cell is used as an experimental sample battery cell, and 48 battery cells which are just baked are selected for an experiment at a time.
The secondary injection experiment comprises the following specific steps:
1. inserting a temperature sensing wire probe into liquid injection holes of 48 aged cells (ensuring that the probe is inserted into a gap at the upper end of the cell and is suspended without contacting other components of the cell, and fixing the temperature sensing wire by using an adhesive tape outside), connecting the temperature sensing wire with a multi-path temperature measuring instrument, and measuring the initial temperature inside the cell to be 40-50 ℃; putting 48 cells into an injection machine, standing for 10-13 min, and reducing the temperature to 35-40 ℃;
2. moving 48 battery cores to a liquid injection position for liquid injection, firstly pumping negative pressure of minus 60kPa to minus 100kPa, and then injecting 10g to 15g of electrolyte with one-time liquid injection amount; moving to a standing position to be connected with a temperature sensing line, standing for 30-35 min, and reducing the temperature to 25-35 ℃; and moving to a liquid injection position for liquid injection, pumping negative pressure to 10-30 kPa, and injecting 5-12 g of electrolyte with the primary liquid injection amount, thereby completing secondary liquid injection, wherein the average time of secondary liquid injection of each battery cell is 40-48 min.
According to the comparative example, the cooling device is applied to the primary injection and the secondary injection, so that the time of the primary injection and the time of the secondary injection are greatly shortened, the battery cell is placed in the cooling device before the primary injection and is cooled in the drying room in an air cooling mode, the cooling of the battery cell is accelerated, the time of the primary injection is shortened, the battery cell is transferred to the secondary injection after the formation and aging, the temperature of the battery cell in the cooling device is reduced in an auxiliary manner through air cooling of an air conditioner in the conveying process of a conveying belt, and the time of the secondary injection is shortened; because the battery core after standing meets the liquid injection requirement by using the cooling device, the times of liquid injection step by step are reduced, the liquid injection time is further shortened, and the liquid injection efficiency is improved.
In conclusion, the cooling device disclosed by the invention is simple in overall structure and low in modification cost, can accelerate the cooling of the lithium ion battery cell, and is combined with the cooling device to carry out process adjustment on the traditional liquid injection method, so that the liquid injection is more stable, the liquid injection efficiency of the battery cell is improved, and the quality of the battery cell is improved.
While the foregoing is directed to the principles of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
Claims (10)
1. A liquid injection method of a lithium ion battery cell is characterized in that: the method comprises the following steps:
1) primary liquid injection: placing the baked lithium ion battery cell (6) into a cooling shell (1) filled with circulating condensed water, transferring the lithium ion battery cell into the cooling shell (1) in a primary liquid injection machine after air cooling for a period of time in a drying room, standing for a period of time, injecting 60% -85% of the total amount of the primary liquid injection electrolyte after negative pressure pumping, transferring the lithium ion battery cell into the cooling shell (1) filled with the circulating condensed water, standing for a period of time, and injecting the rest of the total amount of the primary liquid injection electrolyte at positive pressure;
2) formation and aging: pre-charging the lithium ion battery cell (6) after primary liquid injection, and then standing for a period of time;
3) secondary liquid injection: and transferring the aged lithium ion battery cell (6) into a cooling shell (1) which is filled with circulating condensed water in a secondary liquid injection machine, standing for a period of time, and injecting all electrolyte of secondary liquid injection once after negative pressure pumping.
2. The liquid injection method of the lithium ion battery cell according to claim 1, characterized in that: in the step 1), the temperature range of the baked lithium ion battery cell (6) is 80-120 ℃, and after the baked lithium ion battery cell (6) is placed into a cooling shell (1) filled with circulating condensed water and is subjected to air cooling in a drying room for 30-45 min, the temperature of the lithium ion battery cell (6) is reduced to 40-50 ℃; after standing for 20-30 min after primary liquid injection, the temperature of the lithium ion cell (6) is reduced to 20-30 ℃.
3. The liquid injection method of the lithium ion battery cell according to claim 1, characterized in that: in the step 1), the range of negative pressure pumping before the first liquid injection is-60 kPa to-100 kPa, the range of pressure of positive pressure injection of the residual electrolyte is 5kPa to 30kPa, and the rest of the electrolyte is kept stand for 5 to 10min after the positive pressure injection.
4. The liquid injection method of the lithium ion battery cell according to claim 1, characterized in that: in the step 2), before pre-charging the lithium ion cell (6) subjected to primary liquid injection, a liquid injection port of the lithium ion cell (6) needs to be plugged, and the lithium ion cell (6) subjected to sealing is kept still for 18-24 hours under the conditions that the humidity is 0-2.0% and the temperature is 40-50 ℃; the process of pre-charging the lithium ion battery cell (6) after standing comprises primary pre-charging and secondary pre-charging, wherein the primary pre-charging is carried out for 0.20-0.30 h under the condition of 0.05-0.1C, the total charging amount is 1-3%, the secondary pre-charging is carried out for 2-3 h under the condition of 0.1-0.15C, the total charging amount is 20-45%, and the negative pressure in the lithium ion battery cell (6) after pre-charging is tested to be-5 to-10 kPa.
5. The liquid injection method of the lithium ion battery cell according to claim 1, characterized in that: in the step 2), after the lithium ion battery cell (6) after the pre-charging is performed is kept stand for 16-20 hours under the conditions that the temperature is 40-50 ℃ and the humidity is 0-2.0%, the voltage is stabilized at 3.30-3.33V.
6. The liquid injection method of the lithium ion battery cell according to claim 1, characterized in that: in the step 3), the temperature of the aged lithium ion battery core (6) is 40-50 ℃, the lithium ion battery core is conveyed to a secondary liquid injection machine through a conveyor belt, the battery core is cooled in an air-conditioning air-cooling mode in the conveying process of the conveyor belt, then the battery core is kept still in a cooling shell (1) of the secondary liquid injection machine for 10-20 min, the temperature is reduced to 20-25 ℃, and all electrolyte of secondary liquid injection is injected once after negative pressure of-60 kPa to-100 kPa is pumped out.
7. The cooling device for the liquid injection of the lithium ion battery cell is applied to the liquid injection method of the lithium ion battery cell as claimed in any one of claims 1 to 6, and is characterized by comprising a cooling shell (1), a condensation pipe (2), a water cooling machine (3), a water pump I (4) and a water pump II (5), wherein a plurality of lithium ion battery cells (6) are stored in the cooling shell (1), the condensation pipe (2) is wound outside the cooling shell (1), the water inlet end of the condensation pipe (2) is connected with the water outlet of the water cooling machine (3) through the water pump I (4), and the water outlet end of the condensation pipe (2) is connected with the water inlet of the water cooling machine (3) through the water pump II (5).
8. The cooling device for lithium ion battery cell liquid injection according to claim 7, characterized in that: the peripheral direction of cooling casing (1) is provided with spiral positioning groove (11), spiral positioning groove (11) with condenser pipe (2) joint cooperation.
9. The cooling device for lithium ion battery cell liquid injection according to claim 8, characterized in that: the notch of the spiral positioning groove (11) faces outwards, and the width of the notch of the spiral positioning groove (11) is smaller than the outer diameter of the condensation pipe (2).
10. The cooling device for lithium ion battery cell liquid injection according to claim 7, characterized in that: and flow control valves (7) are respectively installed at the water inlet end and the water outlet end of the condensation pipe (2).
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