CN114020060B - Negative pressure vacuum control system for battery formation equipment and automatic control method thereof - Google Patents
Negative pressure vacuum control system for battery formation equipment and automatic control method thereof Download PDFInfo
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- CN114020060B CN114020060B CN202210023042.1A CN202210023042A CN114020060B CN 114020060 B CN114020060 B CN 114020060B CN 202210023042 A CN202210023042 A CN 202210023042A CN 114020060 B CN114020060 B CN 114020060B
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- 238000000034 method Methods 0.000 title claims abstract description 50
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- 238000005086 pumping Methods 0.000 claims description 22
- 238000010277 constant-current charging Methods 0.000 claims description 20
- 239000007788 liquid Substances 0.000 claims description 17
- 238000010281 constant-current constant-voltage charging Methods 0.000 claims description 16
- 238000000926 separation method Methods 0.000 claims description 14
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- 238000012423 maintenance Methods 0.000 abstract description 2
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 6
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D16/00—Control of fluid pressure
- G05D16/20—Control of fluid pressure characterised by the use of electric means
- G05D16/2006—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means
- G05D16/2013—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using throttling means as controlling means
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Abstract
The invention provides a negative pressure vacuum control system for battery formation equipment and an automatic control method thereof, which are suitable for a negative pressure formation process flow. The invention prolongs the service life, corrosion resistance and measuring range precision of the whole negative pressure system, realizes automatic control, improves the whole individual automation degree of the equipment, is convenient to use, reduces manpower and time, reduces the cost required by maintenance and improves the service efficiency of the whole machine.
Description
Technical Field
The invention belongs to the technical field of lithium battery formation equipment, and particularly relates to a negative pressure vacuum control system for battery formation equipment and an automatic control method thereof.
Background
The formation is a chemical and electrochemical reaction process in which a green plate is converted into a charge state in an electrolyte through charging, impurities are removed, and the electrochemical activity of an active substance of the green plate is improved. Formation comprises different modes such as groove formation outside the battery, battery container formation and the like, and is one of important processes for producing lead-acid batteries, cadmium/nickel batteries and the like.
The direct steel-shelled battery that the assembly was accomplished stews can lead to the inside corrosion of steel-shelled, and aluminium hull and laminate polymer battery need seal after the exhaust in advance, otherwise can produce serious flatulence problem, need use and become the negative pressure technique.
The existing formation negative pressure technology generally controls a negative pressure system in a vacuum proportional valve mode, and can perform stepless regulation through software to reach the production process standard of a lithium battery. Meanwhile, the proportional valve is not easy to disassemble, so that the proportional valve can only be replaced by a new proportional valve, a large amount of time and cost are needed for maintenance, and the overall cost is increased.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a negative pressure vacuum control system for battery formation equipment, which is suitable for a negative pressure formation process and comprises a control device, an atmospheric device and a vacuumizing device, wherein the atmospheric device and the vacuumizing device are communicated with the battery formation equipment through a pipeline, the pipeline is provided with a detection device, the detection device is used for measuring the vacuum degree in the pipeline, and the control device is used for controlling the battery formation equipment as follows:
performing constant-current charging on the battery, entering a first constant-current charging stage, wherein the gas production rate of the battery is low, so that the atmospheric device is closed and/or the vacuumizing rate of the vacuumizing device is increased, entering a second constant-current charging stage after the battery is subjected to constant-current charging for a period of time, the gas production rate of the battery is increased, and the atmospheric device is opened and/or the vacuumizing rate of the vacuumizing device is reduced;
performing constant-current constant-voltage charging on the battery, entering a first constant-current constant-voltage charging stage, forming an SEI film on the surface of the battery to close the atmospheric device and/or improve the vacuumizing rate of the vacuumizing device, and entering a second constant-current constant-voltage charging stage when the constant-current constant-voltage charging on the battery is about to be completed, so that the atmospheric device is opened and/or the vacuumizing rate of the vacuumizing device is reduced until the vacuum state is broken;
and the battery is subjected to constant-current discharge without setting requirements.
Further, setting a first preset vacuum degree and a second preset vacuum degree in the control device, wherein the first preset vacuum degree is greater than the second preset vacuum degree;
in the first stage of constant-current charging, the vacuum degree in the pipeline is not more than the first preset vacuum degree, and if the vacuum degree in the pipeline is more than the first preset vacuum degree, the atmosphere device is opened and/or the vacuumizing rate of the vacuumizing device is reduced;
in the second stage of constant-current charging, the vacuum degree in the pipeline is not lower than the second preset vacuum degree, and if the vacuum degree in the pipeline is lower than the second preset vacuum degree, the atmosphere device is closed and/or the vacuumizing rate of the vacuumizing device is increased;
and in the first stage of constant-current constant-voltage charging, the vacuum degree in the pipeline is not more than the first preset vacuum degree, and if the vacuum degree in the pipeline is more than the first preset vacuum degree, the atmosphere device is opened and/or the vacuumizing rate of the vacuumizing device is reduced.
Specifically, the atmosphere device comprises an atmosphere air control valve and an atmosphere proportional valve, the atmosphere air control valve is used for opening atmosphere air inlet or preventing atmosphere air inlet, and the connection or disconnection of the atmosphere air control valve is controlled by the control device;
the atmosphere gas control valve is connected with the atmosphere proportional valve, the atmosphere proportional valve is connected with the pipeline, and the atmosphere proportional valve is used for controlling the air inlet rate of atmosphere.
The vacuumizing device comprises a vacuumizing pneumatic control valve and a vacuumizing proportional valve, the vacuumizing pneumatic control valve is used for starting vacuumizing or stopping vacuumizing, and the vacuumizing pneumatic control valve is controlled by the control device in a communication or cutting-off mode;
the vacuumizing air control valve is connected with the vacuumizing proportional valve, the vacuumizing proportional valve is connected with the pipeline, and the vacuumizing proportional valve is used for controlling the vacuumizing speed.
The pipeline which is commonly connected with the atmosphere device and the vacuumizing device comprises a multi-stage collecting pipe, the multi-stage collecting pipe comprises a first-stage collecting pipe, a second-stage collecting pipe and a third-stage collecting pipe, and the first-stage collecting pipe is connected with the atmosphere device and the vacuumizing device;
the system further comprises a gas-liquid separation device, the gas-liquid separation device is arranged between the first-stage collecting pipe and the second-stage collecting pipe and used for filtering and removing moisture in gas, the second-stage collecting pipe is connected with the third-stage collecting pipe, and the third-stage collecting pipe is used for being connected with battery formation equipment.
The control device comprises a processor and an input and output module connected with the processor, the input and output module is electrically connected with the atmosphere device, the vacuumizing device and the detection device through point positions, and the processor controls the atmosphere device and the vacuumizing device through the input and output module.
Preferably, when the first preset vacuum degree is maintained, the negative pressure value in the pipeline is-80 kPa;
and when the second preset vacuum degree is maintained, the negative pressure value in the pipeline is-40 kPa.
Further, the detection device comprises a digital display vacuum meter, and the digital display vacuum meter is used for measuring and displaying the negative pressure value of the gas in the connected pipeline and transmitting an electric signal containing the measured gas negative pressure value information to the control device.
Corresponding to the negative pressure vacuum control system for the battery formation equipment, the invention also correspondingly provides an automatic control method of the negative pressure vacuum control system for the battery formation equipment, the method is used for controlling the negative pressure vacuum control system for the battery formation equipment, and the method comprises the following steps:
the control device sets a preset vacuum degree;
the control device transmits a control signal to open the vacuumizing device, and the vacuumizing device performs vacuumizing;
the detection device measures the vacuum degree in the pipeline;
judging whether the vacuum degree measured by the detection device exceeds the preset vacuum degree or not;
if the measured vacuum degree exceeds the preset vacuum degree, the control device transmits a control signal to enable the atmosphere device to be in an open state and convey atmosphere, and if the measured vacuum degree does not exceed the preset vacuum degree, the control device transmits a control signal to enable the atmosphere device to be in a closed state and prevent atmosphere from entering air;
and the detection device measures the vacuum degree in the pipeline again, and judges whether the vacuum degree measured by the detection device exceeds the preset vacuum degree again to form closed-loop control.
Further, the control device simultaneously presets a deviation value, and the determining whether the vacuum degree measured by the detection device exceeds the preset vacuum degree further includes:
if the measured vacuum degree exceeds the preset vacuum degree, judging whether the value of the vacuum degree measured by the detection device, which is higher than the preset vacuum degree, exceeds the preset deviation value, and if the value of the vacuum degree measured by the detection device exceeds the preset deviation value, transmitting a control signal by the control device to enable the atmosphere device to be in an open state and conveying atmosphere;
and if the measured vacuum degree does not exceed the preset vacuum degree, judging whether the value of the vacuum degree measured by the detection device, which is lower than the preset vacuum degree, exceeds the preset deviation value, and if so, transmitting a control signal by the control device to enable the atmosphere device to be in a closed state to prevent atmosphere from entering.
The invention has at least the following beneficial effects:
the system provided by the invention realizes self-detection, can ensure that the battery stably forms an SEI film, has high automation degree, reduces manpower, saves time, has wide application range, and is suitable for all negative pressure formation processes.
Furthermore, the system provided by the invention has the advantages of simple and clear structure, no increase of the overall complexity, realization of the effect of no electrolyte loss in the vacuumizing process, increase of the service life, corrosion resistance and measuring range precision of the overall negative pressure system, and improvement of the use efficiency of the whole machine.
Therefore, the negative pressure vacuum control system for the battery formation equipment and the automatic control method thereof are provided, the structure of the system is clear and concise, the control mode is realized through software, the system is suitable for all negative pressure formation process flows, the service life, the corrosion resistance and the range precision of the whole negative pressure system are increased by +/-1 kpa, the integral individual automation degree of the equipment is improved, the use is convenient, the labor and the time are reduced, and the use efficiency of the whole machine is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic block diagram of the overall structure of a negative pressure vacuum control system for a battery formation device according to embodiment 1 of the present invention;
fig. 2 is a schematic flow chart of an automatic control method of a negative pressure vacuum control system for a battery formation equipment according to embodiment 2 of the present invention;
fig. 3 is a schematic flow chart of an automatic control method of a negative pressure vacuum control system for a battery formation device according to embodiment 3 of the present invention.
Reference numerals:
1-a control device; 2-atmospheric means; 3-a vacuum-pumping device; 4-a detection device; 5-a gas-liquid separation tank; 6-battery formation equipment; 11-PC; 12-an input-output module; 21-atmospheric solenoid valve; 22-atmospheric air control valve; 23-atmospheric proportional valve; 24-a filter; 25-a source of atmospheric gas; 31-vacuum-pumping electromagnetic valve; 32-vacuum air control valve; 33-a vacuum-pumping quantitative valve; 51-primary collecting pipe; 52-a secondary manifold; and 53-three-stage collecting pipe.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Referring to fig. 1, the present invention provides a negative pressure vacuum control system for battery formation equipment, which is suitable for a negative pressure formation process, and includes a control device 1, and an atmospheric device 2 and a vacuum pumping device 3 controlled by the control device 1, wherein the control device 1 is used for switching on and off the atmospheric device 2 and the vacuum pumping device 3, and controlling an air intake rate of the atmospheric device 2 and a vacuum pumping rate of the vacuum pumping device 3;
the gas transmission end of the atmosphere device 2 and the vacuumizing end of the vacuumizing device 3 are connected with a section of pipeline together, and are connected with the battery formation equipment 6 through the pipeline connected together, the atmosphere device 2 is used for transmitting atmosphere to the pipeline connected together, and the vacuumizing device 3 is used for extracting gas from the pipeline connected together;
the pipeline is provided with a detection device, and the detection device is used for measuring the vacuum degree in the pipeline and transmitting the measured vacuum degree information of the gas to the control device through an electric signal;
and the control device switches the atmosphere device and the vacuumizing device according to the vacuum degree information transmitted by the detection device, and controls the air inlet rate of the atmosphere device and the vacuumizing rate of the vacuumizing device, so that closed-loop control is formed.
The formation of the battery is not completed at one time, the formation process of the battery has different stages, and the requirements on the vacuum degree of the different stages of the formation are different.
The method specifically comprises the following steps:
performing constant-current charging on the battery, entering a first constant-current charging stage, wherein the gas production rate of the battery is low, so that the atmospheric device is closed and/or the vacuumizing rate of the vacuumizing device is increased, entering a second constant-current charging stage after the battery is subjected to constant-current charging for a period of time, the gas production rate of the battery is increased, and the atmospheric device is opened and/or the vacuumizing rate of the vacuumizing device is reduced;
performing constant-current constant-voltage charging on the battery, entering a first constant-current constant-voltage charging stage, forming an SEI film on the surface of the battery to close the atmospheric device and/or improve the vacuumizing rate of the vacuumizing device, and entering a second constant-current constant-voltage charging stage when the constant-current constant-voltage charging on the battery is about to be completed, so that the atmospheric device is opened and/or the vacuumizing rate of the vacuumizing device is reduced until the vacuum state is broken;
and the battery is subjected to constant-current discharge without setting requirements.
It should be noted that, the process of switching the vacuum degree of the battery from the constant-current charging stage to the constant-current constant-voltage charging stage is flexibly switched by software, so that the battery is not affected; the constant current discharge duration of the battery is short, and only the set vacuum degree value is required to be ensured, so the requirement is not set generally.
During formation, the polar aprotic solvent serving as a battery in the first charge-discharge process of the battery inevitably reacts on an electrode and electrolyte interface to form a passivation SEI film covering the surface of the electrode, the structure and performance of the SEI film have great influence on the performance of the battery, and the effective and stable SEI film can ensure that the battery has good cycle life and safety. The process of forming the SEI film can generate gas, an opening formation scheme is adopted for ensuring gas discharge, but foreign matters such as moisture, dust and the like in the air can enter a liquid injection port, so that the problems of subsequent battery bulging, internal short circuit and even thermal runaway and the like can be caused. The system provided by the invention is used for pumping away gas generated during the formation of the SEI film, and promoting the stable formation of the SEI film.
Specifically, a first preset vacuum degree and a second preset vacuum degree are set in the control device, wherein the first preset vacuum degree is greater than the second preset vacuum degree;
in the first stage of constant-current charging, the vacuum degree in the pipeline is not more than the first preset vacuum degree, and if the vacuum degree in the pipeline is more than the first preset vacuum degree, the atmosphere device is opened and/or the vacuumizing rate of the vacuumizing device is reduced;
in the second stage of constant-current charging, the vacuum degree in the pipeline is not lower than the second preset vacuum degree, and if the vacuum degree in the pipeline is lower than the second preset vacuum degree, the atmosphere device is closed and/or the vacuumizing rate of the vacuumizing device is increased;
and in the first stage of constant-current constant-voltage charging, the vacuum degree in the pipeline is not more than the first preset vacuum degree, and if the vacuum degree in the pipeline is more than the first preset vacuum degree, the atmosphere device is opened and/or the vacuumizing rate of the vacuumizing device is reduced.
By setting the first preset vacuum degree, the effect of continuously vacuumizing the battery cell from the liquid injection nozzle can be achieved, the formed gas can be discharged in time, the stable and consistent interface is further ensured, and the battery has good cycle life and safety;
through setting up the second and predetermine vacuum, can slow down and keep giving electric core evacuation state's speed from annotating liquid mouth, because the process of switching the vacuum carries out the flexibility by software and switches, has further guaranteed the security of battery, has also prolonged the life of system simultaneously. In addition, in the second stage of constant-current charging, if the vacuum degree is too high, the electrolyte is lost and wasted, and the system provided by the invention can ensure that the electrolyte is not lost and can be recycled.
Specifically, the control device 1 includes a processor and an input/output module 12 connected to the processor, the input/output module 12 is electrically connected to the atmosphere device 2, the vacuum pumping device 3 and the detection device 4 through a point, and the processor controls the atmosphere device 2 and the vacuum pumping device 3 through the input/output module 12.
It should be noted that the input/output module 12 is an IO module, the processor may use a PC, a PLC, or the like, and in this embodiment, the processor is a PC 11.
The atmosphere device 2 comprises a filter 24, an atmosphere electromagnetic valve 21, an atmosphere air control valve 22 and an atmosphere proportional valve 23, wherein the input end of the filter 24 is connected with an external atmosphere air source 25, the output end of the filter 24 is connected with the input end of the atmosphere air control valve 22 and is used for filtering impurities in the atmosphere and conveying the filtered air to the atmosphere air control valve 22;
the atmospheric solenoid valve 21 is electrically connected with the input/output module 12 and the atmospheric control valve 22, the control device 1 controls the communication or the disconnection of the atmospheric control valve 22 through the atmospheric solenoid valve 21, the atmospheric control valve 22 is used for opening atmospheric air intake or preventing atmospheric air intake, the output end of the atmospheric control valve 22 is connected with the input end of the atmospheric proportional valve 23, the output end of the atmospheric proportional valve 23 and the vacuum pumping device 3 are connected with a pipeline together, and the atmospheric proportional valve 23 is used for controlling the air intake rate of the atmosphere to realize the rated conveyance of the atmosphere.
The vacuumizing device 3 comprises a vacuumizing electromagnetic valve 31, a vacuumizing pneumatic control valve 32 and a vacuumizing proportional valve 33, the vacuumizing electromagnetic valve 31 is electrically connected with the input/output module 12 and the vacuumizing pneumatic control valve 32, the control device 1 controls the vacuumizing pneumatic control valve 32 to be communicated or cut off through the vacuumizing electromagnetic valve 31, the vacuumizing pneumatic control valve 32 is used for opening vacuumizing or stopping vacuumizing, the vacuumizing pneumatic control valve 32 is connected with the vacuumizing proportional valve 33, the vacuumizing proportional valve 33 and the atmosphere device 2 are connected with a pipeline together, and the vacuumizing rate of the vacuumizing device 3 can be controlled by adjusting the vacuumizing proportional valve 33, so that the rated extraction of gas is realized.
The pipeline commonly connected with the atmosphere device 2 and the vacuum-pumping device 3 comprises a multi-stage collecting pipe, the multi-stage collecting pipe comprises a first-stage collecting pipe 51, a second-stage collecting pipe 52 and a third-stage collecting pipe 53, and the first-stage collecting pipe 51 is connected with the atmosphere device 2 and the vacuum-pumping device 3;
the system further comprises a gas-liquid separation device, the gas-liquid separation device is arranged between the first-stage collecting pipe 51 and the second-stage collecting pipe 52 and used for filtering and removing moisture in gas, the second-stage collecting pipe 52 is connected with the third-stage collecting pipe 53, and the third-stage collecting pipe 53 is used for being connected with the battery formation equipment 6. In this embodiment, the gas-liquid separation device is a gas-liquid separation tank, and the negative pressure vacuum control system for the battery formation equipment is suitable for the negative pressure formation process of the lithium battery, so the three-stage collecting pipe 53 is used for connecting the lithium battery formation equipment 6. In this embodiment, the gas-liquid separation device is a gas-liquid separation tank 5, and the gas-liquid separation tank 5 adopts the principles of centrifugal separation and wire mesh filtration to realize the liquid removal effect.
It should be noted that, the electric core can be compacted before entering the shell, so that 20% -30% of injected electrolyte can be difficult to absorb, and through the arrangement of the gas-liquid separation device, the loss of the electrolyte can be avoided in the vacuumizing process, the cyclic utilization can be effectively realized, and the required cost is saved.
The final-stage manifold pipes in the multi-stage manifold pipes are connected with the battery formation equipment 6, the maximum number of the battery formation equipment 6 can be connected, and meanwhile, the control is convenient, and the three-stage manifold pipes 53 in the embodiment are the final-stage manifold pipes.
In this embodiment, the detection device 4 is connected to the secondary collecting pipe 52, and the detection device 4 includes a digital display vacuum gauge, which is configured to measure and display the vacuum degree and the negative pressure value of the gas in the connected pipeline, and transmit an electric signal containing the measured gas vacuum degree information to the control device 1.
Specifically, in order to realize the automatic adjustment of the control device 1 on the atmosphere device 2 and the vacuum pumping device 3, the vacuum degree is preset in the processor correspondingly according to the requirement of the formation process;
when the system starts to work, the control device 1 transmits a control signal to switch on the vacuumizing electromagnetic valve 31, the vacuumizing electromagnetic valve 31 controls the vacuumizing pneumatic control valve 32 to be opened, the vacuumizing rate is controlled through the vacuumizing proportional valve 33, the vacuumizing rate is kept constant, and the vacuum degree is increased at a corresponding constant rate;
when the vacuum degree measured by the detection device 4 exceeds the preset vacuum degree, the control device 1 transmits a control signal to switch on the atmospheric electromagnetic valve 21, the atmospheric electromagnetic valve 21 controls the opening of the atmospheric air control valve 22, and controls the air inlet rate of the atmosphere through the atmospheric proportional valve 23, so that the vacuum degree is reduced;
when the vacuum degree measured by the detection device 4 does not exceed the preset vacuum degree and the atmospheric electromagnetic valve 21 is in an open state, the control device 1 closes the atmospheric electromagnetic valve 21, and the atmospheric electromagnetic valve 21 controls the atmospheric air control valve 22 to close, so as to prevent atmospheric air from entering;
when the system finishes working, the control device 1 closes the vacuum electromagnetic valve 31 and the atmospheric electromagnetic valve 21, the vacuum electromagnetic valve 31 controls the vacuum air control valve 32 to close, and the atmospheric electromagnetic valve 21 controls the atmospheric air control valve 22 to close.
Further, according to the requirement of the formation process, a deviation value can be preset in the processor correspondingly, specifically:
when the vacuum degree measured by the detection device 4 is higher than the preset vacuum degree, but the numerical value of the measured vacuum degree higher than the preset vacuum degree does not exceed the preset deviation value, the control device 1 does not transmit a control signal;
when the vacuum degree measured by the detection device 4 is higher than the preset vacuum degree and the measured value of the vacuum degree higher than the preset vacuum degree exceeds the preset deviation value, the control device 1 transmits a control signal to switch on the atmospheric electromagnetic valve 21, the atmospheric electromagnetic valve 21 controls the atmospheric air control valve 22 to be opened, the air inlet rate of the atmosphere is controlled through the atmospheric proportional valve 23, and the vacuum degree is further reduced;
when the vacuum degree measured by the detection device 4 is lower than the preset vacuum degree, but the numerical value of the measured vacuum degree lower than the preset vacuum degree does not exceed the preset deviation value, the control device 1 does not transmit a control signal;
when the vacuum degree measured by the detection device 4 is lower than the preset vacuum degree, and the measured value of the vacuum degree lower than the preset vacuum degree exceeds the preset deviation value, and the atmospheric electromagnetic valve 21 is in an open state, the control device 1 transmits a control signal to close the atmospheric electromagnetic valve 21, and the atmospheric electromagnetic valve 21 controls the atmospheric air control valve 22 to close, so that air intake is prevented.
Preferably, different bias values may be preset for two cases, that is, the vacuum degree measured by the detection means 4 is higher than the preset vacuum degree and lower than the preset vacuum degree.
The control device 1 may adjust the intake rate of the atmospheric metering valve 23 and the evacuation rate of the evacuation metering valve 33 by the degree of vacuum measured by the detection device 4.
Specifically, when the battery to be formed is a lithium battery:
when the first preset vacuum degree is maintained, the negative pressure value in the pipeline is-80 kPa;
and when the second preset vacuum degree is maintained, the negative pressure value in the pipeline is-40 kPa.
Therefore, in order to meet the requirements of different stages of the lithium battery formation process on the vacuum degree, a program can be preset in the processor, so that the control device 1 automatically adjusts the preset vacuum degree through the change of different stages, and further automatically controls and adjusts the atmosphere device 2 and the vacuumizing device 3.
Compared with the traditional negative pressure vacuum control system for the battery formation equipment, the negative pressure vacuum control system for the battery formation equipment provided by the embodiment of the invention has higher control precision, the control precision of the traditional negative pressure vacuum control system for the battery formation equipment is generally +/-3 kPa, and the control precision of the negative pressure vacuum control system for the battery formation equipment provided by the embodiment of the invention is +/-1 kPa.
Preferably, the connections for conveying gas in the foregoing are all connected by using an anti-corrosion gas pipe, and by using the anti-corrosion gas pipe, the service life, the corrosion resistance and the range precision of the whole negative pressure system are increased, and the use efficiency of the whole machine is improved.
Example 2
Corresponding to the negative pressure vacuum control system for battery formation equipment provided in the embodiment of the present invention, an embodiment of the present invention further provides an automatic control method for the negative pressure vacuum control system for battery formation equipment as shown in fig. 2, where the method includes:
s100: the control device 1 sets a preset vacuum degree.
S110: the control device 1 transmits a control signal to turn on the vacuumizing device 3, and the vacuumizing device 3 performs vacuumizing.
Specifically, the control device 1 transmits a control signal to switch on the vacuum-pumping electromagnetic valve 31, the vacuum-pumping electromagnetic valve 31 controls the vacuum-pumping pneumatic control valve 32 to be opened, and the vacuum-pumping rate is controlled by the vacuum-pumping proportional valve 33, so that the vacuum-pumping rate is kept constant, and the vacuum degree is increased at a corresponding constant rate.
S120: the detection device 4 measures the degree of vacuum in the pipe, and the process proceeds to step S130.
S130: and judging whether the vacuum degree measured by the detection device 4 exceeds the preset vacuum degree.
If the measured vacuum degree exceeds the preset vacuum degree, the method goes to step S151; if the measured vacuum degree does not exceed the preset vacuum degree, the process proceeds to step S152.
And S151, the control device 1 transmits a control signal to enable the atmosphere device 2 to be in an open state and convey the atmosphere.
Specifically, the control device 1 transmits a control signal to switch on the atmosphere electromagnetic valve 21, the atmosphere electromagnetic valve 21 controls the atmosphere air control valve 22 to be opened, and the atmosphere proportional valve 23 controls the air intake rate of the atmosphere, so as to reduce the vacuum degree.
After step S151 is completed, the process returns to step S120 again to form closed-loop control.
S152: the control device 1 transmits a control signal to enable the atmosphere device 2 to be in a closed state, and air is prevented from entering.
Specifically, the control device 1 closes the atmospheric solenoid valve 21, and the atmospheric solenoid valve 21 controls the atmospheric air control valve 22 to close, thereby preventing atmospheric air from entering.
After step S152 is completed, the process returns to step S120 again to form closed-loop control.
Example 3
Based on the automatic control method of the negative pressure vacuum control system for the battery formation equipment provided in embodiment 2, the present invention provides a further scheme, in which a deviation value is preset at step S100, please refer to fig. 3, and the method includes:
s100: the control device 1 sets a preset vacuum degree and a deviation value.
Preferably, different bias values may be preset for two cases, that is, the vacuum degree measured by the detection means 4 is higher than the preset vacuum degree and lower than the preset vacuum degree.
S110: the control device 1 transmits a control signal to turn on the vacuumizing device 3, and the vacuumizing device 3 performs vacuumizing.
S120: the detection device 4 measures the degree of vacuum, and the process proceeds to step S130.
S130: and judging whether the vacuum degree measured by the detection device 4 exceeds the preset vacuum degree.
If the measured vacuum degree exceeds the preset vacuum degree, the method goes to step S151; if the measured vacuum degree does not exceed the preset vacuum degree, the process proceeds to step S152.
S151: and judging whether the vacuum degree measured by the detection device 4 is higher than the numerical value of the preset vacuum degree and exceeds the preset deviation value.
If the vacuum degree measured by the detection device 4 is higher than the value of the preset vacuum degree and exceeds the preset deviation value, the operation goes to step S151;
and if the vacuum degree measured by the detection device 4 is higher than the preset vacuum degree, and does not exceed the preset deviation value, the step S120 is executed again to form closed-loop control.
S152: and judging whether the vacuum degree measured by the detection device 4 is lower than the numerical value of the preset vacuum degree and exceeds the preset deviation value.
If the vacuum degree measured by the detection device 4 is lower than the numerical value of the preset vacuum degree and exceeds the preset deviation value, the step S152 is carried out;
and if the vacuum degree measured by the detection device 4 is lower than the preset vacuum degree value and does not exceed the preset deviation value, the step S120 is carried out again to form closed-loop control.
And S151, the control device 1 transmits a control signal to enable the atmosphere device 2 to be in an open state, and the atmosphere device 2 delivers the atmosphere.
After step S151 is completed, the process returns to step S120 again to form closed-loop control.
S152: the control device 1 transmits a control signal to enable the atmosphere device 2 to be in a closed state, and air is prevented from entering.
After step S152 is completed, the process returns to step S120 again to form closed-loop control.
In conclusion, the invention provides the negative pressure vacuum control system for the battery formation equipment and the automatic control method thereof, the structure of the system is clear and concise, the control mode is realized through software, the system is suitable for all negative pressure formation process flows, the service life, the corrosion resistance and the range precision of the whole negative pressure system are increased by +/-1 kpa, the integral individual automation degree of the equipment is improved, the use is convenient, the labor and the time are reduced, and the use efficiency of the whole machine is improved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. The negative pressure vacuum control system for the battery formation equipment is characterized by being suitable for a negative pressure formation process and comprising a control device, an atmospheric device and a vacuumizing device, wherein the atmospheric device and the vacuumizing device are communicated with the battery formation equipment through pipelines, the atmospheric device comprises an atmospheric air control valve and an atmospheric proportional valve, the atmospheric air control valve is used for opening atmospheric air inlet or preventing atmospheric air inlet, the communication or the disconnection of the atmospheric air control valve is controlled by the control device, the atmospheric air control valve is connected with the atmospheric proportional valve, the atmospheric proportional valve is connected with the pipelines, and the atmospheric proportional valve is used for controlling the air inlet rate of the atmosphere;
the pipeline is provided with a detection device, the detection device is used for measuring the vacuum degree in the pipeline, and the control device is used for controlling the battery formation equipment as follows:
performing constant-current charging on the battery, entering a first constant-current charging stage, wherein the gas production rate of the battery is low, so that the atmospheric device is closed and/or the vacuumizing rate of the vacuumizing device is increased, entering a second constant-current charging stage after the battery is subjected to constant-current charging for a period of time, the gas production rate of the battery is increased, and the atmospheric device is opened and/or the vacuumizing rate of the vacuumizing device is reduced;
performing constant-current constant-voltage charging on the battery, entering a first constant-current constant-voltage charging stage, forming an SEI film on the surface of the battery to close the atmospheric device and/or improve the vacuumizing rate of the vacuumizing device, and entering a second constant-current constant-voltage charging stage when the constant-current constant-voltage charging on the battery is about to be completed, so that the atmospheric device is opened and/or the vacuumizing rate of the vacuumizing device is reduced until the vacuum state is broken;
and the battery is subjected to constant-current discharge without setting requirements.
2. The negative pressure vacuum control system for battery formation equipment according to claim 1, wherein a first preset vacuum degree and a second preset vacuum degree are set at the control device, the first preset vacuum degree being greater than the second preset vacuum degree;
in the first stage of constant-current charging, the vacuum degree in the pipeline is not more than the first preset vacuum degree, and if the vacuum degree in the pipeline is more than the first preset vacuum degree, the atmosphere device is opened and/or the vacuumizing rate of the vacuumizing device is reduced;
in the second stage of constant-current charging, the vacuum degree in the pipeline is not lower than the second preset vacuum degree, and if the vacuum degree in the pipeline is lower than the second preset vacuum degree, the atmosphere device is closed and/or the vacuumizing rate of the vacuumizing device is increased;
and in the first stage of constant-current constant-voltage charging, the vacuum degree in the pipeline is not more than the first preset vacuum degree, and if the vacuum degree in the pipeline is more than the first preset vacuum degree, the atmosphere device is opened and/or the vacuumizing rate of the vacuumizing device is reduced.
3. The negative pressure vacuum control system for the battery formation equipment according to claim 1, wherein the vacuumizing device comprises a vacuumizing pneumatic control valve and a vacuumizing proportional valve, the vacuumizing pneumatic control valve is used for starting or stopping vacuumizing, and the vacuumizing pneumatic control valve is controlled by the control device which is communicated or cut off;
the vacuumizing air control valve is connected with the vacuumizing proportional valve, the vacuumizing proportional valve is connected with the pipeline, and the vacuumizing proportional valve is used for controlling the vacuumizing speed.
4. The negative-pressure vacuum control system for a battery formation device according to claim 1, wherein the pipeline to which the atmospheric device and the vacuum evacuation device are commonly connected includes a multi-stage manifold including a primary manifold, a secondary manifold, and a tertiary manifold, and the primary manifold connects the atmospheric device and the vacuum evacuation device;
the system further comprises a gas-liquid separation device, the gas-liquid separation device is arranged between the first-stage collecting pipe and the second-stage collecting pipe and used for filtering and removing moisture in gas, the second-stage collecting pipe is connected with the third-stage collecting pipe, and the third-stage collecting pipe is used for being connected with battery formation equipment.
5. The negative pressure vacuum control system for a battery formation equipment according to any one of claims 1 to 3, wherein the control device comprises a processor and an input/output module connected to the processor, the input/output module electrically connects the atmosphere device, the vacuum pumping device and the detection device through points, and the processor controls the atmosphere device and the vacuum pumping device through the input/output module.
6. The negative pressure vacuum control system for battery formation equipment according to claim 2, wherein the negative pressure value in the pipeline is-80 kPa while maintaining the first predetermined vacuum degree;
and when the second preset vacuum degree is maintained, the negative pressure value in the pipeline is-40 kPa.
7. The negative pressure vacuum control system for the battery formation equipment according to claim 1, wherein the detection device comprises a digital display vacuum gauge, and the digital display vacuum gauge is used for measuring and displaying the negative pressure value of the gas in the connected pipeline and transmitting an electric signal containing the measured gas negative pressure value information to the control device.
8. An automatic control method for controlling the negative pressure vacuum control system for a battery formation apparatus according to any one of claims 1 to 7, the method comprising:
the control device sets a preset vacuum degree;
the control device transmits a control signal to open the vacuumizing device, and the vacuumizing device performs vacuumizing;
the detection device measures the vacuum degree in the pipeline;
judging whether the vacuum degree measured by the detection device exceeds the preset vacuum degree or not;
if the measured vacuum degree exceeds the preset vacuum degree, the control device transmits a control signal to enable the atmosphere device to be in an open state and convey atmosphere, and if the measured vacuum degree does not exceed the preset vacuum degree, the control device transmits a control signal to enable the atmosphere device to be in a closed state and prevent atmosphere from entering air;
and the detection device measures the vacuum degree in the pipeline again, and judges whether the vacuum degree measured by the detection device exceeds the preset vacuum degree again to form closed-loop control.
9. The automatic control method according to claim 8, wherein the control means simultaneously presets a bias value, and the judging whether the degree of vacuum measured by the detection means exceeds the preset degree of vacuum further comprises:
if the measured vacuum degree exceeds the preset vacuum degree, judging whether the value of the vacuum degree measured by the detection device, which is higher than the preset vacuum degree, exceeds the preset deviation value, and if the value of the vacuum degree measured by the detection device exceeds the preset deviation value, transmitting a control signal by the control device to enable the atmosphere device to be in an open state and conveying atmosphere;
and if the measured vacuum degree does not exceed the preset vacuum degree, judging whether the value of the vacuum degree measured by the detection device, which is lower than the preset vacuum degree, exceeds the preset deviation value, and if so, transmitting a control signal by the control device to enable the atmosphere device to be in a closed state to prevent atmosphere from entering.
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