CN114583418A - Lithium battery liquid injection production method, liquid injection mechanism and liquid injection production equipment - Google Patents
Lithium battery liquid injection production method, liquid injection mechanism and liquid injection production equipment Download PDFInfo
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- CN114583418A CN114583418A CN202210205100.2A CN202210205100A CN114583418A CN 114583418 A CN114583418 A CN 114583418A CN 202210205100 A CN202210205100 A CN 202210205100A CN 114583418 A CN114583418 A CN 114583418A
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
- H01M50/609—Arrangements or processes for filling with liquid, e.g. electrolytes
- H01M50/627—Filling ports
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
- H01M50/609—Arrangements or processes for filling with liquid, e.g. electrolytes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The invention discloses a lithium battery liquid injection production method, a liquid injection mechanism and liquid injection production equipment.A plurality of rotary circulating type stations are configured on a rotary disc type liquid injection production line, a battery can be vacuumized by the liquid injection mechanism in the rotating process of each station, electrolyte is rapidly injected into the battery by utilizing the negative pressure effect, the injection time is shortened, and the injected electrolyte rapidly permeates into the whole battery by further pressurizing; in the process of standing the battery, the first liquid injection hole and the second liquid injection hole are utilized to respectively vacuumize and pressurize the interior of the battery, so that the injected electrolyte forms reciprocating motion in the interior of the battery between the first liquid injection hole and the second liquid injection hole, and the absorption efficiency of the electrolyte is accelerated. The invention can simply, conveniently and efficiently realize the continuous production and processing of the lithium battery liquid injection and obviously improve the liquid injection production efficiency.
Description
Technical Field
The invention relates to the technical field of lithium batteries, in particular to a lithium battery liquid injection production method, a liquid injection mechanism and liquid injection production equipment.
Background
At present, the lithium battery industry develops rapidly, the development is more rapid in the aspect of power batteries, and the power batteries become a main stream with the improvement of science and technology.
In the manufacturing process of the lithium battery, liquid injection is a very critical process. In the production process of the battery, electrolyte needs to be injected through the liquid injection hole formed in the battery. However, since the position of the liquid injection hole is fixed, and most batteries are only provided with a single liquid injection hole, the problem of uneven distribution of the electrolyte entering the battery chamber from the liquid injection hole is easy to occur. In addition, because a certain amount of gas exists in the battery, the injected electrolyte cannot well cover the whole space in the battery, so that the coverage area is small, and the phenomenon that the liquid absorption of the battery is slow is caused. In addition, before liquid injection, the liquid injection needle and the liquid injection hole of the battery are in a sealed state, so that the air pressure in the cavity can be gradually increased in the liquid injection process, and the absorption speed of electrolyte is further hindered. These problems described above all cause a disadvantage that the production efficiency is lowered. If the liquid injection pressure or the liquid injection speed is forcibly increased, hidden troubles such as liquid injection, battery bulge and the like can be generated, so that the product quality and the product quality are influenced.
Therefore, in order to meet the market of power batteries with a large demand due to the rapid development of electronic products, a new lithium battery liquid injection technology is urgently needed.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a lithium battery liquid injection production method, a liquid injection mechanism and liquid injection production equipment, which can effectively improve or solve the adverse effects of low liquid injection efficiency, battery deformation and the like of the conventional power battery, improve the yield of liquid injection procedures, the quality and the safety of the battery and shorten the production period of the whole manufacturing of the battery.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the invention provides a lithium battery liquid injection production method, which comprises the following steps:
the method comprises the following steps: the method comprises the steps that a battery to be injected is arranged on a feeding station, the interior of the battery is vacuumized to a first vacuum degree through a first injection hole formed in the top surface of the battery, and the first time is kept;
step two: transferring the battery to a liquid injection station along the rotation center, and continuously injecting electrolyte into the battery through the first liquid injection hole by using differential pressure, wherein the liquid injection time is the second time;
step three: pressurizing the interior of the battery to a first pressure through the first liquid injection hole, keeping the pressure for a third time, and then relieving the pressure of the battery to normal pressure;
step four: continuing to transfer the battery to a standing station, vacuumizing the interior of the battery to a second vacuum degree through a second liquid injection hole arranged on the battery opposite to the first liquid injection hole in the standing process, and keeping the interior of the battery for a fourth time;
step five: continuing to pressurize the interior of the battery to a second pressure through the second liquid injection hole and keeping for a fifth time;
step six: vacuumizing the interior of the battery to a third vacuum degree through the first liquid injection hole, and keeping for a sixth time;
step seven: continuing to pressurize the interior of the battery to a third pressure through the first liquid injection hole and keeping for a seventh time;
step eight: continuing to transfer the battery to a blanking station, and relieving the pressure of the battery to normal pressure;
the first liquid injection hole and the second liquid injection hole are used for respectively vacuumizing and pressurizing the inside of the battery, so that electrolyte injected into the inside of the battery is in the first liquid injection hole and between the second liquid injection holes, and reciprocating motion is formed inside the battery to accelerate the absorption efficiency of the electrolyte.
The lithium battery electrolyte injection production method has the beneficial effects that: the battery is provided with the double liquid injection holes, so that the flow of the injected electrolyte can be controlled by utilizing the pressure action between the two liquid injection holes, and the full coverage of the electrolyte in the battery is realized; by vacuumizing the interior of the battery, the electrolyte can be quickly injected into the interior of the battery by utilizing the formed negative pressure, so that the injection time is shortened, and the injected electrolyte can quickly permeate into the whole battery by further pressurizing; in addition, in the standing process of the battery, the first liquid injection hole and the second liquid injection hole are used for respectively vacuumizing and pressurizing the interior of the battery, so that the electrolyte injected into the interior of the battery forms reciprocating motion in the interior of the battery between the first liquid injection hole and the second liquid injection hole, and the absorption efficiency of the electrolyte is accelerated. The method can ensure the precision of battery liquid injection, accelerate the liquid absorption efficiency of the battery, improve the quality of the battery, reduce the liquid leakage risk, greatly reduce the deformation risk of the battery and be beneficial to improving the safety of the battery.
Further, the steps four to seven are circularly executed one to multiple times. Wherein, one or more standing stations can be arranged according to the difference of the battery capacity, the liquid injection amount and the battery composition, and the alternating cycle times and time can be adjusted. Thus, when the electrolyte circularly reciprocates in the battery between the first electrolyte injection hole and the second electrolyte injection hole, the absorption efficiency of the electrolyte can be improved.
Further, the first vacuum degree is greater than the second vacuum degree and the third vacuum degree. Therefore, a relatively larger negative pressure state is formed inside the battery before liquid injection, the injection speed of the electrolyte is promoted, and the electrolyte is prevented from overflowing from the battery in a large amount when flowing after injection.
Further, the first pressure, the second pressure, and the third pressure are equal. Thus, the electrolyte at different stages can form uniform flow in the battery.
Further, the first step is preceded by the steps of:
performing an insulation test on the battery;
performing pre-injection weighing on the battery;
carrying out clamp loading on the battery;
the step eight is followed by the steps of:
performing disking on the battery;
weighing the battery after liquid injection;
sealing the first liquid injection hole and the second liquid injection hole;
and performing discharging and tray loading on the battery. Therefore, the quality of the supplied battery before liquid injection can be ensured, the liquid injection effect of the battery can be confirmed, and the sealing state of the battery after liquid injection is ensured; and a one-to-one corresponding traceable relation can be formed between the battery and the clamp, so that closed-loop management of the state of the battery is realized.
The invention also provides a lithium battery liquid injection mechanism, comprising:
the first needle head and the second needle head are used for being driven to be respectively jointed with a first liquid injection hole and a second liquid injection hole which are arranged at two opposite ends of the top surface of the battery to be injected; the first needle head is respectively connected with an injection pipeline, a first vacuum pipeline and a first dry gas pipeline through a first liquid storage cup, the second needle head is respectively connected with a second vacuum pipeline and a second dry gas pipeline through a second liquid storage cup, the injection pipeline is connected to an injection pump, the first vacuum pipeline and the second vacuum pipeline are connected to a vacuum source, the first dry gas pipeline and the second dry gas pipeline are connected to a dry gas source, a first valve is arranged on the injection pipeline, a second valve is arranged on the first vacuum pipeline, a third valve is arranged on the first dry gas pipeline, a fourth valve is arranged on the second vacuum pipeline, and a fifth valve is arranged on the second dry gas pipeline;
when the battery is sequentially rotated to the liquid injection station and the standing station along the rotation center by the feeding station, the battery is opened and closed by the first valve and the fifth valve, so that electrolyte is injected into the battery under negative pressure, and the battery is evacuated and pressurized by the first liquid injection hole and the second liquid injection hole respectively, so that the electrolyte is in the first liquid injection hole and the second liquid injection hole, and the inside of the battery forms reciprocating motion to accelerate the absorption efficiency of the electrolyte.
The lithium battery liquid injection mechanism has the beneficial effects that: the first needle head and the second needle head are arranged and can be driven to move to form sealing joint with the first liquid injection hole and the second liquid injection hole on the battery, so that the internal pressure of the battery in the processes of liquid injection and standing is effectively ensured to meet the requirements; the first needle head and the second needle head are respectively connected with a vacuum source and a dry gas source, and the battery can be respectively vacuumized and pressurized through the first needle head or the second needle head, so that the reciprocating motion of the electrolyte in the battery between the first liquid injection hole and the second liquid injection hole is realized; the liquid storage cups are respectively arranged on the first needle head and the second needle head, so that part of the electrolyte sucked out from the first liquid injection hole or the second liquid injection hole due to vacuumizing can be cached, and the electrolyte is prevented from flowing back to a vacuum source; through setting up first valve to fifth valve to through the different combinations of carrying out the switching to first valve to fifth valve, inside the control pours into electrolyte into the battery into under the negative pressure, and the control is annotated liquid hole and second through first and is annotated the inside evacuation of carrying out respectively and pressurize to the battery, and the control makes electrolyte annotate the inside reciprocating motion that forms of battery between the hole at first notes liquid hole and second, realizes accelerating the absorption efficiency of electrolyte.
Further, the different combinations of opening and closing by the first to fifth valves include:
when the battery is positioned on the feeding station, the interior of the battery is vacuumized through the first liquid injection hole by opening the second valve and closing the first valve, the third valve and the fifth valve;
when the battery is positioned on the liquid injection station, the first valve is opened, and the second valve to the fifth valve are closed, so that electrolyte is injected into the battery through the first liquid injection hole by utilizing pressure difference;
after liquid injection, the third valve is opened, and the first valve to the second valve and the fourth valve to the fifth valve are closed, so that the interior of the battery is pressurized through the first liquid injection hole;
when the battery is positioned on the standing station, firstly, the fourth valve is opened, and the first valve, the second valve, the third valve and the fifth valve are closed, so that the interior of the battery is vacuumized through the second liquid injection hole; then, the fifth valve is opened, and the first valve to the fourth valve are closed, so that the interior of the battery is pressurized through the second liquid injection hole; then, vacuumizing the interior of the battery through the first liquid injection hole by opening the second valve and closing the first valve, the third valve and the fifth valve; and then, the third valve is opened, and the first valve to the second valve and the fourth valve to the fifth valve are closed, so that the interior of the battery is pressurized through the first liquid injection hole. So, through the different combinations of the switching of carrying out first valve to fifth valve, realize pouring into the battery with electrolyte under the negative pressure inside to annotate the liquid hole through first and second and annotate the inside evacuation and the pressurization of carrying out respectively of liquid hole to the battery, make electrolyte form reciprocating motion's effective control in that the battery between the liquid hole is annotated to first notes liquid hole and second.
The invention also provides lithium battery liquid injection production equipment which comprises the lithium battery liquid injection mechanism.
The lithium battery electrolyte injection production equipment has the beneficial effects that: the liquid injection precision of the battery can be guaranteed, the liquid absorption efficiency of the battery is accelerated, the quality of the battery is improved, the liquid leakage risk is reduced, the deformation risk of the battery can be greatly reduced, the safety of the battery is also improved, and the continuous production and processing of the liquid injection of the lithium battery can be simply, conveniently and efficiently realized by the equipment.
Further, the method also comprises the following steps:
liquid production line is annotated to carousel formula, it is equipped with battery material loading station, notes liquid station, one to a plurality of station and the unloading station of stewing in proper order according to the carousel direction of rotation, and each station is used for loading respectively the battery, and pass through the rotation of carousel makes the battery is in each circulate in proper order between the station, annotate liquid mechanism one-to-one and locate the each of carousel the station top to driven can rotate and go up and down in step, in order to pass through first syringe needle with the second syringe needle be in on the material loading station with on the battery first annotate the liquid hole with sealed joint respectively between the liquid hole is annotated to the second, and follow-up extremely on the unloading station with first annotate the liquid hole with the second annotates the liquid hole and breaks away from. So, annotate the liquid production line through setting up the carousel formula, not only can shorten production line length, practice thrift the production space, still can annotate the liquid and distribute the alternating when stewing to the battery, with annotate liquid mechanism cooperation operation, effectively improve the uniformity of battery imbibition efficiency and battery notes liquid volume, and battery shaping quality is guaranteed to the production cycle of having shortened the battery whole manufacturing, thereby showing the reduce cost.
Further, still include: the transfer production line is positioned on one side of the rotating disc type liquid injection production line and is sequentially provided with a battery incoming material station, an insulation test station, a weighing station before liquid injection, a clamp cache station, a clamp disc disassembling station, a weighing station after liquid injection, a post-processing station and a discharging disc loading station;
wherein, anchor clamps buffer memory worker station with still be equipped with anchor clamps sabot worker station between the material loading station, insulating test worker station and the station of weighing before annotating the liquid, annotate the liquid after weigh worker station and aftertreatment worker station one side still are equipped with defective products buffer memory worker station, before annotating the liquid weigh worker station with still go on through the manipulator between the anchor clamps sabot worker station the connecing of battery. Therefore, the insulation testing work station is arranged, so that the insulation performance of the incoming material battery can be tested one by one, and the safety of the battery is improved; through setting up the worker station of weighing before annotating liquid, the worker station of weighing after annotating liquid, can sweep the sign indicating number one by one and weigh before, after to the battery, accomplish the closed-loop management of battery notes liquid process production cycle, be favorable to improving the battery quality. The battery provided by the embodiment of the invention has good quality, and is beneficial to improving the energy density and the safety of the battery.
Drawings
Fig. 1 is a schematic structural diagram of a lithium battery liquid injection mechanism according to a preferred embodiment of the present invention;
fig. 2 is a schematic diagram of an arrangement structure of a lithium battery electrolyte injection production device according to a preferred embodiment of the present invention;
fig. 3 is a schematic flow chart of a lithium battery injection production method according to a preferred embodiment of the invention.
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 of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are a part of the embodiments of the present invention, but 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. Unless defined otherwise, technical or scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. As used herein, the word "comprising" and similar words are intended to mean that the element or item preceding the word comprises the element or item listed after the word and its equivalent, but not the exclusion of other elements or items.
The invention aims to provide a lithium battery liquid injection production method, a liquid injection mechanism and liquid injection production equipment, which can effectively improve or solve the adverse effects of low liquid injection efficiency, battery deformation and the like of the conventional power battery, and improve the yield of a liquid injection process and the safety of the battery.
According to the embodiment of the invention, the battery is provided with the double liquid injection holes, incoming materials are subjected to insulation test, then the code scanning weighing is carried out, the battery and the clamp are bound, the battery is ensured to have one-to-one corresponding tracing effect, then liquid injection is carried out, then the distribution alternating type standing is carried out, the clamp is disassembled after the standing is finished, then the liquid injection effect of the battery is confirmed, the state of the battery is subjected to closed-loop management, then the liquid injection holes of the battery are sealed, and finally the battery is placed in a tray and discharged.
The invention can ensure the precision of battery liquid injection, accelerate the battery liquid absorption efficiency, improve the battery quality, reduce the risk of liquid leakage, greatly reduce the risk of battery deformation and is also beneficial to improving the safety of the battery. The invention can simultaneously realize the continuous production and processing of the lithium battery liquid injection simply, conveniently and efficiently.
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Refer to fig. 1. The lithium battery liquid injection mechanism 20 comprises a first needle 202 and a second needle 220. The first needle 202 and the second needle 220 are used for respectively engaging with the first pouring hole 101 and the second pouring hole 103 which are arranged at the two opposite ends of the top surface of the battery 10 to be poured at the lower part when being driven, so as to pour the battery 10.
The first needle 202 is connected with a liquid injection pipeline 205, a first vacuum pipeline 211 and a first drying gas pipeline 209 through a first liquid storage cup 203 respectively. The second needle 220 is connected to the second vacuum pipe 213 and the second dry gas pipe 215 through the second liquid storage cup 219, respectively.
The priming line 205 is connected to a priming pump 206. The first vacuum line 211 and the second vacuum line 213 may be commonly connected to a vacuum source 212. The first drying gas line 209 and the second drying gas line 215 may be commonly connected to a drying gas source 217.
The liquid injection pipeline 205 is provided with a first valve 204, the first vacuum pipeline 211 is provided with a second valve 210, the first drying air pipeline 209 is provided with a third valve 208, the second vacuum pipeline 213 is provided with a fourth valve 214, and the second drying air pipeline 215 is provided with a fifth valve 216.
In a preferred embodiment, the first vacuum pipe 211 and the first drying gas pipe 209 can be connected to the first liquid cup 203 through the first connecting pipe 207; the second vacuum pipe 213 and the second dry gas pipe 215 may be commonly connected to a second reservoir 219 through a second communication pipe 218.
In a preferred embodiment, the first valve 204 through the fifth valve 216 may comprise diaphragm valves. But is not limited thereto.
In a preferred embodiment, the first needle 202 may have a first seal 201 on its lower end and the second needle 220 may have a second seal 221 on its lower end. When the first needle 202 and the second needle 220 are driven to be respectively connected with the first liquid injection hole 101 and the second liquid injection hole 103 on the battery 10, the first sealing ring 201 and the second sealing ring 221 are utilized to enable the first needle 202 and the second needle 220 to be in sealing connection with the first liquid injection hole 101 and the second liquid injection hole 103, so that liquid leakage is avoided, and the internal pressure of the battery 10 in the processes of liquid injection and standing is effectively ensured to meet the requirements.
The injection mechanism 20 may be positioned above a rotating platform, such as the carousel injection line 30 shown in fig. 2. Wherein, be equipped with carousel 301 on the carousel formula annotates liquid production line 30, carousel 301 has the center of rotation. The turntable 301 may be provided with a battery loading station 3001, a liquid injection station 3002, one or more alternate standing stations 3003, and a blanking station 3004 in sequence according to the rotation direction of the turntable 301.
When the battery 10 is sequentially transferred from the loading station 3001 to the electrolyte injection station 3002 and the alternate standing station 3003 along the rotation center of the turntable 301, the electrolyte is injected into the battery 10 under negative pressure by different combinations of opening and closing the first valve 204 to the fifth valve 216, and the inside of the battery 10 is respectively vacuumized and pressurized through the first electrolyte injection hole 101 and the second electrolyte injection hole 103, so that the electrolyte forms a reciprocating motion in the inside of the battery 10 between the first electrolyte injection hole 101 and the second electrolyte injection hole 103, and the absorption efficiency of the electrolyte is improved.
Further, by performing different combinations of opening and closing of the first valve 204 to the fifth valve 216, specifically, the method may include:
when the battery 10 is located at the loading station 3001 before injection, the interior of the battery 10 is evacuated through the first injection hole 101 by opening the second valve 210 and closing the first valve 204, the third valve 208, and the fifth valve 216.
When the battery 10 is located at the injection station 3002 at the time of injection, the electrolyte is injected into the battery 10 through the first injection hole 101 by opening the first valve 204 and closing the second to fifth valves 210 to 216.
After the liquid injection, the inside of the battery 10 is pressurized through the first liquid injection hole 101 by opening the third valve 208 and closing the first to second valves 204 to 210 and the fourth to fifth valves 214 to 216.
When the battery 10 is located at the alternate standing station 3003 during standing, the inside of the battery 10 is evacuated through the second liquid injection hole 103 by opening the fourth valve 214, and closing the first valve 204 to the third valve 208 and the fifth valve 216; then, by opening the fifth valve 216 and closing the first valve 204 to the fourth valve, the inside of the battery 10 is pressurized through the second liquid injection hole 103; then, by opening the second valve 210 and closing the first valve 204, the third valve 208 to the fifth valve 216, the inside of the battery 10 is evacuated through the first pour hole 101; thereafter, the inside of the battery 10 is pressurized through the first pour hole 101 by opening the third valve 208 and closing the first to second valves 204 to 210 and the fourth to fifth valves 214 to 216.
According to the invention, the first needle 202 and the second needle 220 are respectively connected with the vacuum source 212 and the dry air source 217, so that the battery 10 can be respectively vacuumized and pressurized through the first needle 202 or the second needle 220, and the reciprocating motion of the electrolyte in the battery 10 between the first liquid injection hole 101 and the second liquid injection hole 103 is realized. In the present invention, the first needle 202 and the second needle 220 are respectively provided with the first liquid storage cup 203 and the second liquid storage cup 219, so that a part of the electrolyte sucked out from the first liquid injection hole 101 or the second liquid injection hole 103 due to vacuum pumping can be buffered, and the electrolyte can be prevented from flowing back to the vacuum source 212. The invention also realizes the acceleration of the absorption efficiency of the electrolyte by arranging the first valve 204 to the fifth valve 216, controlling the electrolyte to be injected into the battery 10 under negative pressure by performing different combinations of opening and closing on the first valve 204 to the fifth valve 216, controlling the vacuum pumping and the pressurization to be respectively performed on the interior of the battery 10 through the first liquid injection hole 101 and the second liquid injection hole 103, and controlling the electrolyte to form reciprocating motion in the interior of the battery 10 between the first liquid injection hole 101 and the second liquid injection hole 103.
Refer to fig. 2. The lithium battery liquid injection production equipment of the invention can comprise the lithium battery liquid injection mechanism 20 (not shown) arranged on the rotating disc type liquid injection production line 30 and the circulation production line 40.
The turntable type liquid injection production line 30 is provided with a turntable 301, and the turntable 301 is sequentially provided with a battery feeding station 3001, a liquid injection station 3002, one or more alternative standing stations 3003 and a discharging station 3004 in the rotation direction of the turntable 301. For example, three alternating rest stations 3003 are shown. But is not limited thereto. Each station is used for loading the batteries 10, and the batteries 10 are sequentially circulated among the stations through the rotation of the rotary disc 301. The liquid injection mechanisms 20 are arranged above the stations of the turntable 301 in a one-to-one correspondence manner, and are driven to synchronously rotate and ascend and descend on the stations, so that the first needle 202 and the second needle 220 are respectively in sealing engagement with the first liquid injection hole 101 and the second liquid injection hole 103 on the battery 10 on the loading station 3001 through descending, or the first needle 202 and the second needle 220 are separated from the first liquid injection hole 101 and the second liquid injection hole 103 through ascending when the battery 10 rotates to the unloading station 3004 along with the battery 10.
The electrolyte injection mechanism 20 performs the above-mentioned electrolyte injection and standing of the battery 10 during the synchronous rotation with the battery 10, including injecting the electrolyte into the battery 10 under negative pressure by performing different combinations of the above-mentioned opening and closing of the first valve 204 to the fifth valve 216, and performing the vacuum pumping and the pressurization of the interior of the battery 10 through the first electrolyte injection hole 101 and the second electrolyte injection hole 103, respectively, so that the electrolyte forms the reciprocating motion in the interior of the battery 10 between the first electrolyte injection hole 101 and the second electrolyte injection hole 103, thereby accelerating the absorption efficiency of the electrolyte.
The circulation production line 40 is located on one side of the turntable type liquid injection production line 30, and can be sequentially provided with a battery incoming material station 401, a hipot insulation test station 402, a pre-liquid injection weighing and code scanning station 403, a clamp cache station 404, a clamp disc disassembling station 405, a post-liquid injection code scanning and weighing station 406, a post-processing station 407 and a discharging and disc assembling station 408.
Wherein, a fixture disc loading station 409 is further arranged between the fixture buffer station 404 and the feeding station 3001 on the turntable type liquid injection production line 30. The battery 10 is also connected between the pre-injection weighing and code scanning station 403 and the jig pallet loading station 409 by the robot 50.
And a defective product NG cache work station 410 is further arranged on one side of the insulation test work station 402, the pre-injection weighing code scanning work station 403, the post-injection code scanning weighing work station 406 and the post-treatment work station 407.
The work stations are correspondingly provided with operation equipment, and the batteries and the clamps can be circulated through the transmission lines.
According to the lithium battery liquid injection production equipment, the insulation test work station 402 is arranged, so that the insulation performance of the incoming material battery 10 can be tested one by one, and the safety of the battery is improved; by arranging the pre-injection code scanning work station 403 and the post-injection code scanning weighing work station 406, the batteries can be scanned and weighed one by one, so that the closed-loop management of the production cycle of the battery injection process is realized, and the quality of the batteries is improved; by arranging the rotating disc type liquid injection production line 30, after the battery 10 is subjected to liquid injection and distribution alternative type standing, the liquid absorption efficiency of the battery and the consistency of the liquid injection amount of the battery are effectively improved, the forming quality of the battery 10 is ensured, and the production period of the whole battery is shortened.
Moreover, the lithium battery electrolyte injection production equipment can ensure the precision of the battery electrolyte injection, reduce the risk of electrolyte leakage, greatly reduce the risk of battery deformation, and be beneficial to improving the safety of the battery, and the equipment can simply, conveniently and efficiently realize the continuous production and processing of the lithium battery electrolyte injection.
The battery produced by the lithium battery liquid injection production equipment has good quality, and is beneficial to improving the energy density and the safety of the battery.
Refer to fig. 3. The lithium battery liquid injection production method can be used for injecting the battery liquid by using the lithium battery liquid injection production equipment. The invention relates to a lithium battery liquid injection production method, which comprises the following steps:
step S100: and (5) battery materials.
First, a battery to be filled is provided to the battery receiving station 401. Wherein two pour holes, a first pour hole 101 and a second pour hole 103, are provided at opposite ends of the top surface of the battery 10. The first pour hole 101 and the second pour hole 103 may be located at positions outside the two electrode posts 102 of the battery 10, respectively (refer to fig. 1).
It should be understood that in the present embodiment, the battery 10 obtained first should be a battery that has passed the water content test.
The water content test requirement of the cell 10 is, for example, a water content of 500ppm or less. Preferably the water content is < 200 ppm.
The cells 10 may be loaded for circulation by a tray or jig, or the cells 10 may be circulated individually by a robot or other auxiliary mechanism.
Step S200: and (5) insulation testing.
It should be understood that in embodiments of the present invention, the fuel cell 10 is first positioned at the insulation test station 402, and the specific positioning may comprise a variety of conventional manners. Then, the insulation test of the electrode posts 102 of the battery 10 can be performed by using a tester. The test requirement is, for example, an insulation resistance ≦ 25m Ω. Preferably, the insulation resistance is less than or equal to 20m omega.
The bad battery may be transferred to the NG cache station 410. Uniformly treating the defective batteries according to requirements; and the single battery insulation test data can be uploaded to the tracing system in real time, and the system performs centralized management.
Step S300: and (5) pre-weighing and code scanning.
It should be understood that, in the embodiment of the present invention, the code scanning and weighing station 403 before filling performs code scanning and weighing on the battery 10 body before filling, so as to obtain corresponding data before filling of the battery 10, upload the data to the tracing system for centralized management, and perform identification and determination on the current state of the battery 10 during code scanning. By arranging the NG cache work station 410, defective products can be removed to the NG cache work station 410, and the risk of poor circulation is avoided.
The weight range of the battery 10 may be set before the battery 10 is weighed, i.e. a standard range of weight of the battery 10 is defined. This range can be derived from the cell design and standard deviation of the cell sample, for example the weight determination range can be selected to be ≦ 2%, preferably + -1%. By arranging the NG cache work station 410, defective products can be removed to the NG cache work station 410, and the risk of poor circulation is avoided.
Step S400: and putting the battery into a clamp for tray loading.
It should be appreciated that in embodiments of the present invention, the weighed batteries 10 are first palletized. Through the empty fixture buffer station 404, during loading, the empty fixture is first transferred to the fixture tray loading station 409. Then, the two clamping plates of the clamp are pushed open by driving. The battery 10 is then placed into the jig by the robot 50. The jacking driving mode of the clamp clamping plate can select a motor, an air cylinder, a cam and the like. The clamp can be designed in an integrated mode, the clamp plates on the two sides can be connected through the tension springs, and the bottom of the clamp can be provided with the positioning pins, so that the transferring process can be quickly and accurately positioned.
The fixture buffer station 404 is provided with a small number of empty fixtures, preferably one for use and one for standby.
Then, battery feeding is carried out, the corresponding relation between the battery feeding sequence and position as well as the battery feeding sequence and the clamp can be memorized and bound under the control of a liquid injection machine program, and the one-to-one tracing effect is achieved. After the battery 10 is completely loaded, the fixture is integrally transferred to the loading station 3001 of the turntable 301, i.e. the battery 10 to be injected is disposed at the loading station 3001.
Step S500: and (4) battery liquid injection.
It should be understood that in the embodiment of the present invention, after the tray-loaded battery 10 is first transferred to the loading station 3001, the filling machine confirms that the battery 10 is in the fixture, i.e., the filling process is started. The execution of the injection program may specifically include the following steps:
step S5001: the inside of the battery 10 is evacuated to a first degree of vacuum through the first pour hole 101 and maintained for a first period of time.
When the battery 10 is located at the loading station 3001 of the turntable 301, the first needle 202 and the second needle 220 of the injection mechanism 20 are driven to descend, the first needle 202 is pressed with the first injection hole 101 through the first sealing ring 201, and the second needle 220 is pressed with the second injection hole 103 through the second sealing ring 221. Next, the second valve 210 on the first vacuum line 211 is opened, and the remaining valves are closed. Then, the battery 10 in the jig is vacuumized. The gas in the cavity of the battery 10 is pumped out through the first needle 202, so as to ensure that the inside of the battery 10 is in a vacuum environment, the vacuum environment is pumped out until the vacuum degree is less than-95 kpa, the vacuum environment is kept for 5s, and then the first valve 204 is closed.
Step S5002: the electrolyte is injected into the battery 10 through the first injection hole 101 by using the pressure difference, and the injection time is the second time.
When the liquid injection mechanism 20 synchronously rotates to the liquid injection station 3002 from the feeding station 3001 along with the turntable 301, the first valve 204 is opened, and the rest valves are closed, and liquid injection is performed through the liquid injection pump 206. The liquid is injected into the battery 10 on the jig from the first reservoir cup 203 through the first needle 202 and the first injection hole 101, and is injected by the pressure difference. The injection time may be, for example, 30s to 1min, and the specific time may be adjusted according to the injection amount.
Step S5003: the inside of the battery 10 is pressurized to the first pressure through the first pour hole 101 and held for a third time.
The third valve 208 is opened, the remaining valves are closed, low dew point gas such as dry gas, inert gas or nitrogen gas is introduced into the battery 10 through the first liquid injection hole 101 to 200kpa, the temperature is maintained for 10 to 60 seconds, and then the third valve 208 is closed.
Step S5004: the cell 10 was depressurized to atmospheric pressure.
Because the liquid injection turntable 301 is designed in a multi-station mode, the whole liquid injection process can be decomposed, and waiting time is reduced. That is, during the operation of the turntable 301, the other mechanisms can operate synchronously without interference. Moreover, a certain pause time can be reserved in each station by the turntable 301, so that the coordination of the actions of each mechanism or station is ensured, and the liquid injection program action is decomposed and completed through the feeding station 3001 and the liquid injection station 3002, thereby improving the liquid injection efficiency.
Step S600: and (5) standing alternately.
It should be appreciated that in the present embodiment, the filled battery 10 is first moved from the filling station 3002 to the alternate rest station 3003 by the rotation of the turntable 301, and distributed alternate rest is performed, i.e., the rest procedure is initiated. The alternating resting may comprise performing the following steps:
step S6001: the inside of the battery 10 is evacuated to the second degree of vacuum through the second liquid injection hole 103 and maintained for a fourth time.
The battery 10 and the liquid injection mechanism 20 are synchronously rotated to the alternate standing station 3003. During the standing, the fourth valve 214 on the second vacuum line 213 is opened, and the remaining valves are closed. Then, the battery 10 in the jig is vacuumized. And (3) exhausting gas in the cavity of the battery 10 through the second needle 220 to ensure that the inside of the battery 10 is in a vacuum environment, vacuumizing until the vacuum degree is less than-80 kpa, keeping the vacuum environment for 10s-60s, and then closing the fourth valve 214.
Step S6002: the inside of the battery 10 continues to be pressurized to the second pressure through the second pour hole 103 and is kept for a fifth time.
The fifth valve 216 is opened and the remaining valves are closed. And introducing dry gas, inert gas, nitrogen gas or other low dew point gas into the battery 10 to 200kpa through the second liquid injection hole 103, keeping the temperature for 10-60 s, and then using a fifth valve 216.
Step S6003: the inside of the battery 10 is evacuated to a third degree of vacuum through the first pour hole 101 and maintained for a sixth time.
The second valve 210 is opened and the remaining valves are closed. Then, the battery 10 in the jig is vacuumized. The gas in the cavity of the battery 10 is pumped out through the first needle 202, the vacuum environment in the battery 10 is ensured, the vacuum degree is pumped out to be less than-80 kpa, and the vacuum degree is kept for 10s-60 s; and then the second valve 210 is closed.
Step S6004: the interior of the battery 10 continues to be pressurized to the third pressure through the first pour hole 101 and is held for a seventh time.
The third valve 208 is opened, the remaining valves are closed, low dew point gas such as dry gas, inert gas or nitrogen gas is introduced into the battery 10 through the first liquid injection hole 101 to 200kpa, the temperature is maintained for 10 to 60 seconds, and then the third valve 208 is closed.
The steps S6001 to S6004 may be performed one or more times in a loop. The number of alternate cycles and time may be adjusted according to the capacity of the battery 10, the amount of liquid injected, and the composition of the battery 10. In this way, the efficiency of absorption of the electrolyte can be increased while the electrolyte is circulating back and forth in the battery 10 between the first pour hole 101 and the second pour hole 103.
Step S6005: after the standing is completed, the battery 10 is continuously transferred to the blanking station 3004, and the pressure of the battery 10 can be relieved to normal pressure by lifting the liquid injection mechanism 20.
Because the liquid injection turntable 301 is designed in a multi-station mode, the whole standing process can be decomposed, and waiting time is reduced. That is, during the operation of the turntable 301, the other mechanisms can operate synchronously without interference. Moreover, a certain pause time can be reserved in each station of the turntable 301, so that the coordination of the actions of each mechanism or station is ensured, and the standing program actions are decomposed and completed through the three alternative standing stations 3003, thereby improving the liquid absorption efficiency of the battery 10.
In a preferred embodiment, the first vacuum degree is set to be greater than the second vacuum degree and the third vacuum degree, so that a relatively larger negative pressure state is formed inside the battery 10 before liquid injection, the injection speed of the electrolyte is accelerated, and the electrolyte is prevented from overflowing from the battery 10 in a large amount when flowing after injection.
In a preferred embodiment, the first, second and third pressures are set to be equal so that electrolyte at different stages can form a uniform flow within the cell 10.
In an optional embodiment, the method for pressurizing the inside of the battery comprises the step of introducing dried inert gas or nitrogen into the inside of the battery 10 through the first liquid injection hole 101 or the second liquid injection hole 103, so that the inside of the battery 10 can be ensured to be always in a state of reaching the water content standard, an unexpected reaction can be effectively prevented, and the safety of liquid injection production can be ensured.
Step S700: the battery 10 is disked.
It should be understood that, in the embodiment of the present invention, the turntable 301 is first rotated to the blanking station 3004, the battery 10 with the liquid injection left is blanked, and the battery 10 is transferred to the fixture tray detaching station 405 to detach the tray from the battery 10. The blanking sequence and position of the battery 10 and the corresponding relation of the battery and the clamp can be memorized and bound by program control of the liquid injection machine, so that a one-to-one tracing effect is achieved. After the tray removal of the battery 10 is completed, the battery is transferred to the post-injection code-scanning weighing station 406, and the empty clamp transfers the whole to the clamp buffer station 404.
Step S800: and (5) scanning the code and weighing.
It should be understood that, in the embodiment of the present invention, the post-injection code scanning and weighing station 406 first scans and weighs the battery 10 body, so as to obtain corresponding data after the injection of the battery 10, the corresponding data is automatically determined by the system, and the data is uploaded to the tracing system for centralized management. And can also discern the present state of battery 10 and judge when sweeping the sign indicating number, through NG buffer work station 410 that sets up, can reject to NG buffer work station 410 the defective products, stop bad circulation risk.
Additionally, a range of battery 10 weights may be set, i.e., a standard range of battery 10 weights defined, before battery 10 is weighed. This range can be based on the design of cell 10 and the standard deviation of the sampling of cell 10, for example, the weight determination range can be selected to be ≦ 2%, preferably ± 1%. Through setting up NG buffer memory worker station 410, can reject the defective products to NG buffer memory worker station 410, stop bad circulation risk, accomplish to annotate the periodic closed-loop management of battery 10 monomer in the liquid process.
Step S900: and (7) post-sealing treatment.
It should be understood that, in the embodiment of the present invention, the post-processing station 407 first performs the sealing process on the first pour hole 101 and the second pour hole 103 on the battery 10 body. The sealing method may include rubber plug punching, adhesive paper sticking, or other sealing methods to ensure the sealing state of the battery 10 after leaving the electrolyte filling machine.
Step S1000: discharging and loading into a tray.
It should be appreciated that in an embodiment of the present invention, the sealed battery 10 is first palletized at the outfeed palletizer station 408. Or may be a monomer flow. Seamless connection of material transfer between the processes is carried out according to the feeding mode of the next process, and the whole production of the battery 10 is promoted to be smooth.
According to the invention, the battery 10 is provided with the double liquid injection holes, so that the flow of the injected electrolyte can be controlled by utilizing the pressure action between the two liquid injection holes, and the full coverage of the electrolyte in the battery 10 is realized; by using the rotating disc type liquid injection production line 30, the inside of the battery 10 can be vacuumized, the electrolyte can be rapidly injected into the inside of the battery 10 by using the formed negative pressure effect, the injection time is shortened, and the injected electrolyte can rapidly permeate into the whole battery 10 by further pressurizing; in addition, during the standing process of the battery 10, the inside of the battery 10 is respectively vacuumized and pressurized by the first liquid injection hole 101 and the second liquid injection hole 103, so that the electrolyte injected into the inside of the battery 10 forms a reciprocating motion in the inside of the battery 10 between the first liquid injection hole 101 and the second liquid injection hole 103, and the absorption efficiency of the electrolyte is accelerated.
Therefore, the method can ensure the precision of the battery liquid injection, accelerate the battery liquid absorption efficiency, improve the battery quality, reduce the liquid leakage risk, greatly reduce the deformation risk of the battery and be beneficial to improving the safety of the battery, and the method can simply, conveniently and efficiently realize the continuous production and processing of the lithium battery liquid injection; meanwhile, the method can also ensure the quality of the incoming battery before liquid injection, confirm the liquid injection effect of the battery and ensure the sealing state of the battery after liquid injection; and a one-to-one corresponding traceable relation can be formed between the battery and the clamp, so that closed-loop management of the state of the battery is realized.
Although the embodiments of the present invention have been described in detail hereinabove, it is apparent to those skilled in the art that various modifications and variations can be made to these embodiments. However, it is to be understood that such modifications and variations fall within the scope and spirit of the present invention as set forth in the appended claims. Moreover, the invention as described herein is capable of other embodiments and of being practiced or of being carried out in various ways.
Claims (10)
1. A lithium battery liquid injection production method is characterized by comprising the following steps:
the method comprises the following steps: the method comprises the steps that a battery to be injected is arranged on a feeding station, the interior of the battery is vacuumized to a first vacuum degree through a first injection hole formed in the top surface of the battery, and the first time is kept;
step two: transferring the battery to a liquid injection station along the rotation center, and continuously injecting electrolyte into the battery through the first liquid injection hole by using differential pressure, wherein the liquid injection time is the second time;
step three: pressurizing the interior of the battery to a first pressure through the first liquid injection hole, keeping the pressure for a third time, and then relieving the pressure of the battery to normal pressure;
step four: continuing to transfer the battery to a standing station, vacuumizing the interior of the battery to a second vacuum degree through a second liquid injection hole which is arranged on the battery and is opposite to the first liquid injection hole in the standing process, and keeping the interior of the battery for a fourth time;
step five: continuing to pressurize the interior of the battery to a second pressure through the second liquid injection hole and keeping for a fifth time;
step six: vacuumizing the interior of the battery to a third vacuum degree through the first liquid injection hole, and keeping for a sixth time;
step seven: continuing to pressurize the interior of the battery to a third pressure through the first liquid injection hole and keeping for a seventh time;
step eight: continuing to transfer the battery to a blanking station, and relieving the pressure of the battery to normal pressure;
the first liquid injection hole and the second liquid injection hole are used for respectively vacuumizing and pressurizing the inside of the battery, so that electrolyte injected into the inside of the battery is in the first liquid injection hole and between the second liquid injection holes, and reciprocating motion is formed inside the battery to accelerate the absorption efficiency of the electrolyte.
2. The lithium battery electrolyte injection production method according to claim 1, wherein the step four to the step seven are cyclically performed one to a plurality of times.
3. The lithium battery electrolyte injection production method of claim 1, wherein the first vacuum degree is greater than the second vacuum degree and the third vacuum degree.
4. The lithium battery electrolyte injection production method of claim 1, wherein the first pressure, the second pressure, and the third pressure are equal.
5. The lithium battery electrolyte injection production method according to claim 1, wherein the first step further comprises the following steps before the first step:
performing an insulation test on the battery;
performing pre-injection weighing on the battery;
carrying out clamp loading on the battery;
the step eight is followed by the steps of:
performing tray removal on the battery;
weighing the battery after liquid injection;
sealing the first liquid injection hole and the second liquid injection hole; and
and discharging and dishing up the battery.
6. A lithium battery liquid injection mechanism is characterized by comprising:
the first needle head and the second needle head are used for being driven to be respectively jointed with a first liquid injection hole and a second liquid injection hole which are arranged at two opposite ends of the top surface of the battery to be injected; the first needle is respectively connected with a liquid injection pipeline, a first vacuum pipeline and a first dry air pipeline through a first liquid storage cup, the second needle is respectively connected with a second vacuum pipeline and a second dry air pipeline through a second liquid storage cup, the liquid injection pipeline is connected to a liquid injection pump, the first vacuum pipeline and the second vacuum pipeline are connected to a vacuum source, the first dry air pipeline and the second dry air pipeline are connected to a dry air source, a first valve is arranged on the liquid injection pipeline, a second valve is arranged on the first vacuum pipeline, a third valve is arranged on the first dry air pipeline, a fourth valve is arranged on the second vacuum pipeline, and a fifth valve is arranged on the second dry air pipeline;
when the battery is sequentially rotated to the liquid injection station and the standing station along the rotation center by the feeding station, the battery is opened and closed by the first valve and the fifth valve, so that electrolyte is injected into the battery under negative pressure, and the battery is evacuated and pressurized by the first liquid injection hole and the second liquid injection hole respectively, so that the electrolyte is in the first liquid injection hole and the second liquid injection hole, and the inside of the battery forms reciprocating motion to accelerate the absorption efficiency of the electrolyte.
7. The lithium battery electrolyte injection mechanism according to claim 6, wherein the different combinations of opening and closing by the first to fifth valves include:
when the battery is positioned on the feeding station, the interior of the battery is vacuumized through the first liquid injection hole by opening the second valve and closing the first valve, the third valve and the fifth valve;
when the battery is positioned on the liquid injection station, the first valve is opened, and the second valve to the fifth valve are closed, so that electrolyte is injected into the battery through the first liquid injection hole by utilizing pressure difference;
after liquid injection, the third valve is opened, and the first valve to the second valve and the fourth valve to the fifth valve are closed, so that the interior of the battery is pressurized through the first liquid injection hole;
when the battery is positioned on the standing station, firstly, the fourth valve is opened, and the first valve, the second valve, the third valve and the fifth valve are closed, so that the interior of the battery is vacuumized through the second liquid injection hole; then, the fifth valve is opened, and the first valve to the fourth valve are closed, so that the interior of the battery is pressurized through the second liquid injection hole; then, the second valve is opened, and the first valve, the third valve and the fifth valve are closed, so that the interior of the battery is vacuumized through the first liquid injection hole; and then, the third valve is opened, and the first valve to the second valve and the fourth valve to the fifth valve are closed, so that the interior of the battery is pressurized through the first liquid injection hole.
8. A lithium battery electrolyte injection production device is characterized by comprising the lithium battery electrolyte injection mechanism of claim 6 or 7.
9. The lithium battery electrolyte injection production device according to claim 8, further comprising:
liquid production line is annotated to carousel formula, it is equipped with battery material loading station, notes liquid station, one to a plurality of station and the unloading station of stewing in proper order according to the carousel direction of rotation, and each station is used for loading respectively the battery, and pass through the rotation of carousel makes the battery is in each circulate in proper order between the station, annotate liquid mechanism one-to-one and locate the each of carousel the station top to driven can rotate and go up and down in step, in order to pass through first syringe needle with the second syringe needle be in on the material loading station with on the battery first annotate the liquid hole with sealed joint respectively between the liquid hole is annotated to the second, and follow-up extremely on the unloading station with first annotate the liquid hole with the second annotates the liquid hole and breaks away from.
10. The lithium battery electrolyte injection production device according to claim 9, further comprising:
the transfer production line is positioned on one side of the rotating disc type liquid injection production line and is sequentially provided with a battery incoming material station, an insulation test station, a weighing station before liquid injection, a clamp cache station, a clamp disc disassembling station, a weighing station after liquid injection, a post-processing station and a discharging disc loading station;
wherein, anchor clamps buffer memory worker station with still be equipped with anchor clamps sabot worker station between the material loading station, insulating test worker station and the station of weighing before annotating the liquid, annotate the liquid after weigh worker station and aftertreatment worker station one side still are equipped with defective products buffer memory worker station, before annotating the liquid weigh worker station with still go on through the manipulator between the anchor clamps sabot worker station the connecing of battery.
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Cited By (1)
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