CN217134470U - Automatic control device for negative pressure formation of lithium battery - Google Patents
Automatic control device for negative pressure formation of lithium battery Download PDFInfo
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- CN217134470U CN217134470U CN202220471898.0U CN202220471898U CN217134470U CN 217134470 U CN217134470 U CN 217134470U CN 202220471898 U CN202220471898 U CN 202220471898U CN 217134470 U CN217134470 U CN 217134470U
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Abstract
The utility model discloses a lithium cell negative pressure ization becomes automatic control device, including negative pressure evacuation mechanism, charging and discharging equipment and regulation and control mechanism, negative pressure evacuation mechanism is including vacuum pump and evacuation pipe, and the vacuum pump passes through the notes liquid mouth of evacuation pipe with the lithium cell to be connected, and regulation and control mechanism is including thermistor, feedback circuit and logic controller, and thermistor sets up in the evacuation pipe, and thermistor passes through feedback circuit and is connected with logic controller, and the control end of vacuum pump, charging and discharging equipment's control end all are connected with logic controller. The utility model discloses a regulation and control mechanism has realized the real-time accurate control to negative pressure and current value in the lithium cellization becomes, has guaranteed to become the stable discharge of producing gas, is favorable to forming stable SEI membrane, helps the good performance of later stage lithium cell performance.
Description
Technical Field
The utility model relates to a lithium cell negative pressure becomes technical field, specifically is a lithium cell negative pressure becomes automatic control device.
Background
The lithium ion battery can generate a large amount of gas in the formation process, and the gas can affect the film forming stability of an SEI film if the gas cannot be discharged in time before the formation is finished, and can affect the normal insertion of lithium ions into a negative electrode material in the later charging process, thereby easily causing irreversible capacity attenuation such as lithium precipitation, electrode material stripping and the like. The laminate mode's laminate mode laminate soft-packaged battery formation process can become the binding power of in-process anchor clamps to electric core through control and will become the gas that the process produced and discharge smoothly from the lamination between to form stable in structure's SEI membrane, the gas of production is kept in the gas bag and is discharged effectively through later stage Degassing process. The produced gas of the square-shell battery in the formation process can not be effectively discharged through the constraint force of the clamp, and the currently common solution adopts a negative pressure formation mode to continuously pump out the produced gas from a liquid injection port of the lithium battery in the formation process. At present, the negative pressure is basically kept in a constant state in the whole process of the negative pressure formation process, but the batteries are different, and a batch of batteries in the formation process usually adopt the same formation charging capacity, so that the effective discharge of the formed gas is not facilitated, and the battery formation process cannot be accurately controlled.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a lithium cell negative pressure becomes automatic control device for solve the problem that the unable accurate control negative pressure value of lithium cell negative pressure becomes the condition with forming in-process.
The technical scheme of the utility model is that:
the utility model provides a lithium cell negative pressure becomes automatic control device, is including negative pressure evacuation mechanism, charging and discharging equipment and regulation and control mechanism, negative pressure evacuation mechanism including vacuum pump and evacuation pipe, the vacuum pump is connected through the notes liquid mouth of evacuation pipe with the lithium cell, regulation and control mechanism including thermistor, feedback circuit and logic controller, thermistor sets up in the evacuation pipe, and thermistor passes through feedback circuit and is connected with logic controller, and the control end of vacuum pump, charging and discharging equipment's control end all are connected with logic controller.
The regulating mechanism is characterized by further comprising an air pumping flow stabilizing pipe, wherein the two ends of the air pumping flow stabilizing pipe are connected to the vacuum pumping pipe, the thermistor is arranged in the air pumping flow stabilizing pipe, the feedback circuit comprises a constant voltage power supply and a pulse counter, the thermistor is connected with the constant voltage power supply to form a series circuit, the current output end of the series circuit is connected with the pulse current input end of the pulse counter, and the counting signal output end of the pulse counter is connected with the logic controller.
The air-extracting flow stabilizing tube and the vacuum pump are connected with an electrolyte collecting bottle, namely the air-extracting flow stabilizing tube, the electrolyte collecting bottle and the vacuum pump are sequentially connected through a vacuum-pumping tube.
The air-extracting flow stabilizing pipe adopts a Venturi tube, the inner pipe diameters of the inlet and the outlet of the Venturi tube are both 5-10mm, the minimum inner pipe diameter of the Venturi tube is 2-3mm, and the thermistor is arranged in the Venturi tube and is adjacent to the outlet of the Venturi tube.
The logic controller comprises a main controller, a negative pressure controller and a charge and discharge controller, wherein the negative pressure controller and the charge and discharge controller are respectively connected with the main controller, the counting signal output end of the pulse counter is connected with the main controller, the control end of the vacuum pump is connected with the negative pressure controller, and the control end of the charge and discharge equipment is connected with the charge and discharge controller.
The utility model has the advantages that:
(1) the utility model discloses regulation and control mechanism counts the gas production of battery formation in-process through the form of bubble, can enough guarantee to produce gas and can turn into measurable pulse signal with producing the gas rate outside by discharging the lithium cell steadily.
(2) The utility model discloses a thermistor and constant voltage power supply turn into the pulse current signal with the production rate of bubble, have realized the real-time signal output to forming the product rate of producing, become the condition for accurate control and provide the signal basis.
(3) The utility model discloses a logic controller controls the charge-discharge current of vacuum pump and charging and discharging equipment according to the pulse count value that pulse counter gathered, can give the negative pressure of accurate control according to the true product gas situation of every electric core and become the condition, has realized the accurate control to single electric core formation condition.
To sum up, the utility model discloses a thermistor and current source will produce the gas rate and turn into real-time current pulse signal who changes and realized the real time control to changing into the condition, have solved the technical defect that the negative pressure formation technology that adopts at present does not consider difference between the lithium cell, have realized the real-time accurate control to negative pressure and current value in the single electrical core formation, have guaranteed to become effective stable discharge of producing the gas, are favorable to forming stable SEI membrane, help the good performance of later stage lithium cell performance.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic diagram of current output of a lithium battery before gas generation.
FIG. 3 is a schematic diagram of current output after gas generation of a lithium battery.
Fig. 4 is a current variation diagram of the output pulse current of the present invention.
The technical scheme includes that the device comprises the following components, by reference numeral, 1-a vacuum pump, 2-a vacuum tube, 3-a venturi tube, 4-a thermistor, 5-a constant voltage power supply, 6-a pulse counter, 7-an electrolyte collecting bottle, 8-a main controller, 9-a negative pressure controller, 10-a charge and discharge controller, 11-a charge and discharge device and 12-a lithium battery.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
An automatic control device for negative pressure formation of lithium batteries comprises a negative pressure vacuumizing mechanism, a charging and discharging device 11 and a regulating mechanism, wherein the negative pressure vacuumizing mechanism comprises a vacuum pump 1 and a vacuumizing tube 2, the vacuum pump 1 is connected with a liquid injection port of a lithium battery 12 through the vacuumizing tube 2, the regulating mechanism comprises a Venturi tube 3, a thermistor 4, a constant voltage power supply 5, a pulse counter 6 and a logic controller, two ends of the Venturi tube 3 are connected to the vacuumizing tube 2 to serve as a part of a conveying section of the vacuumizing tube 2, the inner diameters of an inlet and an outlet of the Venturi tube 3 are both 5-10mm, the minimum inner diameter of the Venturi tube 3 is 2-3mm, an electrolyte collecting bottle 7 is connected between the outlet of the Venturi tube 3 and the vacuum pump 1, namely the Venturi tube 3, the electrolyte collecting bottle 7 and the vacuum pump 1 are sequentially connected through the vacuumizing tube 2, the thermistor 4 is arranged in the Venturi tube 3 and is adjacent to the outlet of the Venturi tube 3, the thermistor 4 is connected with the constant voltage power supply 5 to form a series circuit, the current output end of the series circuit is connected with the pulse current input end of the pulse counter 6, the logic controller comprises a main controller 8, a negative pressure controller 9 and a charge-discharge controller 10, the negative pressure controller 9 and the charge-discharge controller 10 are respectively connected with the main controller 8, the counting signal output end of the pulse counter 6 is connected with the main controller 8, the control end of the vacuum pump 1 is connected with the negative pressure controller 9, and the control end of the charge-discharge device 11 is connected with the charge-discharge controller 10.
The utility model discloses a theory of operation:
firstly, a charging and discharging device 11 and a negative pressure vacuumizing mechanism are both connected with a lithium battery 12 to carry out negative pressure formation operation, the lithium battery generates gas along with the formation stage, the generated gas and part of electrolyte firstly enter a Venturi tube 3 along with a vacuumizing tube 2, the Venturi tube 3 converts the passing gas into bubbles with similar size and stable flow rate, the bubbles and the electrolyte continuously enter an electrolyte collecting bottle 7 through the vacuumizing tube 2, and the gas is discharged after passing through a vacuum pump 1 after the electrolyte collecting bottle 7 collects the electrolyte;
the control principle of the regulating mechanism is as follows:
(1) referring to fig. 2 and 3, the gas is not generated at the initial stage of the negative pressure formation, and the constant voltage power supply 5 outputs a small current signal i under the high temperature and high resistance state of the thermistor 4 1 Gas is generated along with the progress of the formation stageThe bubble 13 disturbs the thermistor 4 to change the resistance value thereof in a pulse type, and the constant voltage power supply 5 outputs a large current pulse signal i 2 ；
(2) The pulse counter 6 receives a pulse current signal (shown in figure 4) output by the constant voltage power supply 5, and then outputs a pulse count value signal in unit time in real time after analysis and processing;
(3) the main controller 8 outputs a vacuumizing control signal to the negative pressure controller 9 according to the pulse count value, the negative pressure controller 9 adjusts the negative pressure of the vacuum pump 1, meanwhile, the main controller 8 outputs a charging and discharging control signal to the charging and discharging controller 10 according to the pulse count value signal, and the charging and discharging controller 10 controls the charging and discharging current, the cut-off condition and other parameters of the charging and discharging equipment 11 for formation operation.
Specifically, the control parameters of the logic controller are as follows:
the initial setting negative pressure of the vacuum pump 1 is-30 kPa, the formation initial current of the charging and discharging equipment 11 is set to be 0.02C, and when the main controller 8 receives a pulse count value signal, the gas production rate of the lithium battery is obtained according to the pulse count value per minute;
the main controller 8 outputs a vacuum pumping control signal as a negative pressure controller 9 according to the gas production rate, and the initial gas production rate of the lithium battery 12 is V 0 Gas production rate after t time is V t The negative pressure controller 9 adjusts the negative pressure value of the vacuum pump 1 to-30V t /V 0 kPa, meanwhile, the maximum negative pressure value is set to be-60 kPa, when the gas production rate begins to decrease, the negative pressure value of the vacuum pump 1 is adjusted to the negative pressure value at the same rate in the gas production rate increasing process, and the lithium battery 12 stands for 10min after the gas production is finished and slowly recovers to the external air pressure value;
the main controller 8 outputs a charge and discharge control signal to the charge and discharge controller 10 according to the gas production rate, and the charge and discharge controller 10 outputs the charge and discharge control signal when the voltage is V t ＝10*V 0 When the charge/discharge controller 10 increases the charge/discharge rate of the charge/discharge device 11 to 0.05C, when V is set t ＝20*V 0 When the charging and discharging rate is increased to 0.1C, the gas production rate is decreased to V again 0 When the gas generation is finished, the charging and discharging formation operation is finished, and the lithium battery is kept stand10min。
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. The utility model provides a lithium cell negative pressure becomes automatic control device which characterized in that: the negative pressure vacuumizing mechanism comprises a vacuum pump and a vacuumizing pipe, the vacuum pump is connected with a liquid injection port of a lithium battery through the vacuumizing pipe, the regulating mechanism comprises a thermistor, a feedback circuit and a logic controller, the thermistor is arranged in the vacuumizing pipe and connected with the logic controller through the feedback circuit, and a control end of the vacuum pump and a control end of the charging and discharging equipment are connected with the logic controller.
2. The automatic control device for the negative pressure formation of the lithium battery according to claim 1, characterized in that: the regulating mechanism is characterized by further comprising an air pumping flow stabilizing pipe, wherein the two ends of the air pumping flow stabilizing pipe are connected to the vacuum pumping pipe, the thermistor is arranged in the air pumping flow stabilizing pipe, the feedback circuit comprises a constant voltage power supply and a pulse counter, the thermistor is connected with the constant voltage power supply to form a series circuit, the current output end of the series circuit is connected with the pulse current input end of the pulse counter, and the counting signal output end of the pulse counter is connected with the logic controller.
3. The automatic control device for the negative pressure formation of the lithium battery according to claim 2, characterized in that: the air-extracting flow stabilizing tube and the vacuum pump are connected with an electrolyte collecting bottle, namely the air-extracting flow stabilizing tube, the electrolyte collecting bottle and the vacuum pump are sequentially connected through a vacuum-pumping tube.
4. The automatic control device for the negative pressure formation of the lithium battery according to claim 2, characterized in that: the air-extracting flow stabilizing pipe adopts a Venturi tube, the inner pipe diameters of the inlet and the outlet of the Venturi tube are both 5-10mm, the minimum inner pipe diameter of the Venturi tube is 2-3mm, and the thermistor is arranged in the Venturi tube and is adjacent to the outlet of the Venturi tube.
5. The automatic control device for the negative pressure formation of the lithium battery according to claim 2, characterized in that: the logic controller comprises a main controller, a negative pressure controller and a charge and discharge controller, wherein the negative pressure controller and the charge and discharge controller are respectively connected with the main controller, the counting signal output end of the pulse counter is connected with the main controller, the control end of the vacuum pump is connected with the negative pressure controller, and the control end of the charge and discharge equipment is connected with the charge and discharge controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220471898.0U CN217134470U (en) | 2022-03-03 | 2022-03-03 | Automatic control device for negative pressure formation of lithium battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220471898.0U CN217134470U (en) | 2022-03-03 | 2022-03-03 | Automatic control device for negative pressure formation of lithium battery |
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| CN217134470U true CN217134470U (en) | 2022-08-05 |
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| CN202220471898.0U Active CN217134470U (en) | 2022-03-03 | 2022-03-03 | Automatic control device for negative pressure formation of lithium battery |
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