CN115663319B - Battery formation method and battery formation equipment - Google Patents
Battery formation method and battery formation equipment Download PDFInfo
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- CN115663319B CN115663319B CN202211400061.8A CN202211400061A CN115663319B CN 115663319 B CN115663319 B CN 115663319B CN 202211400061 A CN202211400061 A CN 202211400061A CN 115663319 B CN115663319 B CN 115663319B
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- 230000015572 biosynthetic process Effects 0.000 title claims abstract description 283
- 238000000034 method Methods 0.000 title claims abstract description 195
- 239000003792 electrolyte Substances 0.000 claims abstract description 208
- 239000007788 liquid Substances 0.000 claims abstract description 182
- 238000000605 extraction Methods 0.000 claims abstract description 44
- 238000002161 passivation Methods 0.000 claims abstract description 18
- 230000001105 regulatory effect Effects 0.000 claims abstract description 6
- 230000001276 controlling effect Effects 0.000 claims description 34
- 238000004140 cleaning Methods 0.000 claims description 15
- 238000001514 detection method Methods 0.000 claims description 11
- 238000005086 pumping Methods 0.000 claims description 11
- 230000002950 deficient Effects 0.000 abstract description 4
- 238000003860 storage Methods 0.000 description 17
- 238000010586 diagram Methods 0.000 description 11
- 238000004590 computer program Methods 0.000 description 7
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 6
- 229910001416 lithium ion Inorganic materials 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000000243 solution Substances 0.000 description 6
- 238000005260 corrosion Methods 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 5
- 238000001035 drying Methods 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 238000009423 ventilation Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000008151 electrolyte solution Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 239000007773 negative electrode material Substances 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
The application discloses a battery formation method and battery formation equipment. In the battery formation method, the capacity of overflowed electrolyte in the liquid collecting container is obtained; when the capacity of the overflowed electrolyte exceeds a first capacity threshold, the extraction speed of the overflowed electrolyte in the formation process is reduced, so that the battery can normally form a passivation film layer in the formation process. Compared with the prior art, the electrolyte loss condition of the battery is reflected through the capacity of overflowed electrolyte, and when the electrolyte capacity in the liquid collecting container is large, the large electrolyte loss of the formed battery is proved, so that the formation of the air suction negative pressure is regulated in real time, and the generation of defective batteries can be effectively avoided.
Description
Technical Field
The application relates to the technical field of batteries, in particular to a battery formation method and battery formation equipment.
Background
The lithium ion battery mainly uses a carbon material as a negative electrode material and uses a lithium-containing compound as a positive electrode material. When the battery is charged, lithium ions are generated on the positive electrode of the battery, and the generated lithium ions move to the negative electrode through the electrolyte; the carbon as the negative electrode has many micropores, and lithium ions reaching the negative electrode are intercalated into the micropores of the carbon layer, and the more lithium ions are intercalated, the higher the charge capacity. In the process of manufacturing the lithium ion battery, electrolyte overflows due to the influence of gas and negative pressure generated in the formation process, and if the electrolyte overflows too much, defective batteries are generated.
In the prior art, a technician manually observes electrolyte at a battery after formation of the battery each time, so that the electrolyte is replenished when the electrolyte is insufficient, but the replenishment of the electrolyte at the moment cannot ensure whether the yield of the battery is affected by lack of the electrolyte in the previous formation process, so how to reduce the formation loss of liquid to increase the yield of the formed battery is a problem to be solved urgently by the technician in the field.
Disclosure of Invention
The embodiment of the application discloses a battery formation method and battery formation equipment, which are used for reducing formation loss of liquid, increasing formation cell yield and reducing production cost.
In a first aspect, the present application provides a battery formation method, applied to a battery formation apparatus, the battery formation apparatus including a liquid collecting container, a negative pressure system, and a controller, the negative pressure system being connected to the liquid collecting container, the controller being connected to the negative pressure system, the controller being configured to control a pumping speed of the negative pressure system to electrolyte overflowed in a battery formation process, the liquid collecting container being configured to collect the pumped overflowed electrolyte in the battery formation process, the method comprising: the controller obtains the capacity of the overflowed electrolyte collected in the liquid collecting container; when the capacity of the overflowed electrolyte in the liquid collecting container reaches a first capacity threshold, the controller controls the negative pressure system to reduce the extraction speed of the overflowed electrolyte in the battery formation process, wherein the first capacity threshold is smaller than the critical capacity of the overflowed electrolyte in the liquid collecting container when the battery can normally form a passivation film layer in the formation process.
In the battery formation method, the capacity of overflowed electrolyte in the liquid collecting container is obtained; when the capacity of the overflowed electrolyte reaches a first capacity threshold, the extraction speed of the overflowed electrolyte in the formation process is reduced, so that the battery can normally form a passivation film layer in the formation process. Compared with the prior art, the electrolyte loss condition of the battery is reflected through the capacity of overflowed electrolyte, and when the electrolyte capacity in the liquid collecting container is large, the large electrolyte loss of the formed battery is proved, so that the formation of the air suction negative pressure is regulated in real time, and the generation of defective batteries can be effectively avoided.
In one embodiment, the first capacity threshold is determined based on the number of cells in the formation process and the initial amount of electrolyte.
In one embodiment, the calculation formula of the first capacity threshold is:
X 0 <a*n*L 0 *b
wherein X is 0 For the first capacity threshold, n is the number of cells in the formation process, L 0 For the initial electrolyte volume, b is the theoretical loss tangent, and a is the correction constant of the theoretical loss tangent in the actual formation process.
In one embodiment, the controller controls the negative pressure system to reduce the extraction rate for the overflow electrolyte during battery formation, comprising: the controller controls the negative pressure system to reduce the negative pressure applied in the formation process.
In one embodiment, the method further comprises: after the formation process is finished, when the capacity of the overflowed electrolyte in the liquid collecting container exceeds a preset second capacity threshold, the controller controls the negative pressure system to be filled with air so as to remove the overflowed electrolyte in the connecting pipeline of the battery formation equipment.
In one embodiment, a capacity sensor is disposed in the liquid collecting container, the capacity sensor is used for detecting the capacity of the overflow electrolyte in the liquid collecting container, and the controller obtains the capacity of the overflow electrolyte in the liquid collecting container, and the controller comprises: the controller receives a detection result sent by the capacity sensor and used for indicating the capacity of the overflowed electrolyte in the liquid collecting container.
In one embodiment, the battery formation device further includes a battery formation bin, a gas-liquid separator, and a pressure sensor, a liquid outlet of the battery formation bin is connected with a liquid inlet of the gas-liquid separator, a liquid outlet of the gas-liquid separator is connected with a liquid inlet of the liquid collecting container, a gas outlet of the gas-liquid separator is connected with the negative pressure system through the pressure sensor, a first switch is disposed between the gas outlet of the gas-liquid separator and the negative pressure system, a first passage is formed between the battery formation bin, the gas-liquid separator, the pressure sensor and the negative pressure system after the first switch is opened, and before the controller obtains the capacity of the overflowed electrolyte in the liquid collecting container, the method further includes: the controller controls the first switch to be turned on; and after the first switch is started, the controller controls the negative pressure system to start extracting overflowed electrolyte in the battery formation process.
In one embodiment, after the first switch is turned on, the controller controls the negative pressure system to start pumping the overflow electrolyte in the battery formation process, and the method further includes: the controller controls the negative pressure system to start to be filled with air so as to remove the overflowed electrolyte in the connecting pipeline of the battery formation equipment.
In one embodiment, a second switch is further disposed between the gas-liquid separator and the negative pressure system, the second switch is connected with the first switch in parallel, after the second switch is turned on, a second path among the battery formation bin, the gas-liquid separator, the air pressure sensor and the negative pressure system is formed, and before the controller controls the first switch to be turned on, the method further includes: the controller controls the second switch to be turned on; after the second switch is turned on, the controller controls the negative pressure system to start to introduce air, so that the introduced air passes through the second passage to remove the overflowed electrolyte in the connecting pipeline of the battery formation equipment; the controller controls the second switch to be closed.
In a second aspect, the present application provides a battery formation device, the battery formation device includes a controller, a liquid collecting container, a battery formation bin, a gas-liquid separator, a gas pressure sensor and a negative pressure system, a liquid outlet of the battery formation bin is connected with a liquid inlet of the gas-liquid separator, a liquid outlet of the gas-liquid separator is connected with a liquid inlet of the liquid collecting container, a gas outlet of the gas-liquid separator is connected with the negative pressure system through the gas pressure sensor, and the controller is used for controlling a pumping speed of the negative pressure system and includes: a capacity obtaining module for obtaining a capacity of the overflow electrolyte in the liquid collecting container; and the extraction speed adjusting module is used for controlling the negative pressure system to reduce the extraction speed of the overflow electrolyte in the battery formation process when the capacity of the overflow electrolyte in the liquid collecting container reaches a first capacity threshold value, wherein the first capacity threshold value is smaller than the critical capacity of the overflow electrolyte in the liquid collecting container when the battery can normally form a passivation film layer in the formation process.
In one embodiment, the extraction speed adjustment module includes: and the negative pressure regulating submodule is used for controlling the negative pressure system to reduce the negative pressure applied in the formation process.
In one embodiment, the controller further comprises: and the electrolyte cleaning module is used for controlling the negative pressure system to be filled with air when the capacity of the overflowed electrolyte in the liquid collecting container exceeds a preset second capacity threshold after the formation process is finished so as to clean the overflowed electrolyte in the connecting pipeline of the battery formation equipment.
In one embodiment, a capacity sensor is disposed in the liquid collecting container, the capacity sensor is used for detecting the capacity of the overflow electrolyte in the liquid collecting container, and the capacity obtaining module includes: and the detection result receiving sub-module is used for receiving the detection result sent by the capacity sensor and used for indicating the capacity of the overflowed electrolyte in the liquid collecting container.
In one embodiment, when a first switch is disposed between the air outlet of the gas-liquid separator and the negative pressure system, a first passage is formed between the battery formation bin, the gas-liquid separator, the air pressure sensor and the negative pressure system after the first switch is turned on, and the controller further includes: a first switch control module for controlling the first switch to be turned on before the capacity of the overflow electrolyte in the liquid collecting container is obtained; and the electrolyte extraction module is used for controlling the negative pressure system to start to extract overflowed electrolyte in the battery formation process after the first switch is started.
In one embodiment, the controller further comprises: the electrolyte cleaning module is further used for controlling the negative pressure system to start to be filled with air before controlling the negative pressure system to start to extract overflowed electrolyte in the battery formation process so as to clean the overflowed electrolyte in the connecting pipeline of the battery formation equipment.
In one embodiment, when a second switch is further disposed between the gas-liquid separator and the negative pressure system, and the second switch is connected with the first switch in parallel, the second switch is turned on to form a second path between the battery formation bin, the gas-liquid separator, the air pressure sensor and the negative pressure system, and the controller further includes: the second switch control module is used for controlling the second switch to be turned on before controlling the first switch to be turned on; the electrolyte cleaning module is further used for controlling the negative pressure system to start to be introduced with air after the second switch is turned on, so that the introduced air passes through the second passage to clean the overflow electrolyte in the connecting pipeline of the battery formation equipment; the second switch control module is further configured to control the second switch to be turned off after the second switch is turned on for a preset time.
It should be understood that, in the second aspect of the present application, the technical solutions of the first aspect of the present application are consistent, and the beneficial effects obtained by each aspect and the corresponding possible embodiments are similar, which are not repeated.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural view of a battery formation apparatus according to the prior art of the present application;
fig. 2 is a schematic structural diagram of a battery formation device according to an embodiment of the present application;
fig. 3 is a schematic flow chart of a battery formation method according to an embodiment of the present disclosure;
fig. 4 is a schematic flow chart of a battery formation method according to an embodiment of the present disclosure;
fig. 5 is a schematic flow chart of a battery formation method according to an embodiment of the present disclosure;
fig. 6 is a schematic flow chart of a battery formation method according to an embodiment of the present disclosure;
fig. 7 is a schematic structural diagram of a battery formation device according to an embodiment of the present application;
Fig. 8 is a schematic flow chart of a battery formation method according to an embodiment of the present disclosure;
fig. 9 is a schematic flow chart of a battery formation method according to an embodiment of the present disclosure;
fig. 10 is a schematic structural diagram of a battery formation device according to an embodiment of the present application;
fig. 11 is a schematic flow chart of a battery formation method according to an embodiment of the present disclosure;
fig. 12 is a schematic structural diagram of a battery formation device according to an embodiment of the present disclosure;
fig. 13 is a schematic structural diagram of a computer device according to an embodiment of the present application.
Detailed Description
The following description of the technical solutions in the embodiments of the present application will be made clearly and completely with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
It should be noted that the terms "comprising" and "having" and any variations thereof in the embodiments and figures herein are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may include other steps or elements not listed or inherent to such process, method, article, or apparatus.
In the following description, reference is made to "some embodiments" which describe a subset of all possible embodiments, but it is to be understood that "some embodiments" can be the same subset or different subsets of all possible embodiments and can be combined with one another without conflict.
Fig. 1 is a schematic structural view of a battery formation apparatus according to the prior art of the present application. As shown, the apparatus may include: the liquid collecting container 10, the controller 11, the battery formation bin 12, the gas-liquid separator 13, the air pressure sensor 14 and the negative pressure system 15, the liquid outlet of the battery formation bin 12 is connected with the liquid inlet of the gas-liquid separator 13, the liquid outlet of the gas-liquid separator 13 is connected with the liquid inlet of the liquid collecting container 10, the gas outlet of the gas-liquid separator 13 is connected with the negative pressure system 15 through the air pressure sensor 14, the controller 11 is respectively electrically connected with the air pressure sensor 14 and the negative pressure system 15, and the controller 11 is used for controlling the negative pressure system 15 to operate.
Alternatively, the number of the battery formation chambers 12 may be more than two, or may be one, and the specific number may be set by those skilled in the art according to actual needs, which is not limited in this application. When the number of the battery forming chambers 12 is two or more, the battery forming chambers 12 and the gas-liquid separator 13 may be connected by a collecting pipe for collecting the electrolyte overflowed from the two or more battery forming chambers into one flow.
Optionally, the above-mentioned battery formation device may further include a flexible pipe device, where the flexible pipe device includes a corrosion-resistant flexible hose and a fixed connector, where the above-mentioned battery formation bin 12, the gas-liquid separator 13, the air pressure sensor 14, and the negative pressure system 15 may be connected by the corrosion-resistant flexible hose, and the connection part between the corrosion-resistant flexible hose and each structure may be connected by the fixed connector, so as to ensure reliable air tightness and corrosion resistance, and not to cause leakage of the electrolyte.
Alternatively, the gas-liquid separator 13 may include a gas-liquid separation filter portion for separating and filtering the gas generated in the formation process and the overflow electrolyte to inject the separated overflow electrolyte into the liquid collecting container 10 through the liquid outlet, and a drying portion for drying the gas to send the dried gas out through the gas outlet.
Before the implementation, a technician puts the battery to be formed into the battery formation bin 12, and injects initial electrolyte into the battery formation bin 12, when the implementation is started, the technician starts and adjusts control parameters of the negative pressure system 15 through the controller 11 to negative pressure the inside of the battery formation equipment, and as the negative pressure is continuously applied to the battery formation equipment, the liquid level of the electrolyte in the battery formation bin 12 starts to rise, so that the electrolyte overflows the battery formation bin 12 and enters a pipeline channel, and meanwhile, gas generated in the battery formation process also enters the pipeline channel, then, the gas and overflowed electrolyte enter the gas-liquid separator 13 for separation, and the electrolyte and fine impurities enter the liquid collection container after being filtered; the gas still exists in the corrosion-resistant flexible hose, at the moment, the gas in the pipeline and the moisture brought by the electrolyte are dried due to the action of the drying part in the gas-liquid separator 13, and the dried gas is pumped out by negative pressure, so that only the dried gas enters the subsequent pipeline, and the subsequent pipeline is not corroded, thereby greatly prolonging the service life of the subsequent pipeline and ensuring the air tightness of the subsequent pipeline. In the whole process, the air pressure sensor 14 acquires the air pressure value inside the battery formation equipment in real time and sends the acquired air pressure value to the controller 11, so that the controller 11 adjusts the extraction speed of the negative pressure system in real time, the air pressure controllability in the formation process is realized, and the reliability is improved.
However, in the above process, the technician needs to manually observe the electrolyte at the battery formation bin in real time after each battery formation is completed, so that the electrolyte is replenished when the electrolyte is insufficient, but the replenishment of the electrolyte at this time cannot ensure whether the yield of the battery is affected by the lack of the electrolyte in the previous formation process.
In order to solve the above technical problems, the present application provides a battery formation method, which can be applied to the battery formation device.
Fig. 2 is a schematic structural diagram of a battery formation device according to an embodiment of the present application, as shown in the drawing, based on the battery formation device shown in fig. 1, the controller 11 is electrically connected to the negative pressure system 15 and the liquid collecting container 10, respectively.
Fig. 3 is a schematic flow chart of a battery formation method according to an embodiment of the present application, as shown in the drawing, applied to the battery formation apparatus shown in fig. 2, where the battery formation method may include the following steps:
in step S301, the controller obtains the volume of overflow electrolyte collected in the liquid collecting container.
Alternatively, a capacity sensor for detecting the capacity of the overflow electrolytic solution, such as a pressure sensor, a weight sensor, a liquid level sensor, and the like, may be installed in the above-described liquid collecting container. The installation position of the sensor is set by a person skilled in the art according to actual needs, for example, when the pressure sensor is installed, the sensor can be installed at the bottom of the inner wall of the liquid collecting container, so that the capacity of overflowed electrolyte can be calculated by detecting the pressure received by the bottom due to the extrusion of the electrolyte; when the weight sensor is installed, the weight sensor can be installed at the bottom of the liquid collecting container, and the bottom can be the bottom of the inner wall or the bottom of the outer wall so as to calculate the capacity of overflowed electrolyte by detecting the weight of the liquid collecting container; when the liquid level sensor is installed, it may be installed at a fixed height so that the subsequent step S302 is performed when the capacity of the overflowed electrolyte reaches a capacity corresponding to the fixed height.
In step S302, when the capacity of the overflow electrolyte reaches a first capacity threshold, the controller controls the negative pressure system to reduce the extraction speed of the overflow electrolyte in the formation process of the battery, wherein the first capacity threshold is smaller than the critical capacity of the overflow electrolyte when the battery can normally form a passivation film layer in the formation process.
Optionally, the first capacity threshold may be calculated by a technician in advance on the volume of the battery formation bin in the battery formation device and the critical capacity of the overflow electrolyte when the battery can normally form the passivation film layer, so as to obtain a threshold range to which the first capacity threshold belongs, and a suitable value is selected from the threshold range as the first capacity threshold, where a specific value of the first capacity threshold may be selected by a person skilled in the art according to actual situations.
Alternatively, the first capacity threshold may be determined based on the number of cells in the formation process and the initial amount of electrolyte.
It should be understood that, since the loss factor of the electrolyte in the battery formation process mainly includes the consumed part in the battery formation process and the electrolyte overflowed from the battery formation chamber due to the continuous application of negative pressure by the battery formation apparatus, that is, the electrolyte capacity in the battery formation chamber when the battery can normally form the passivation film layer should be greater than the capacity of the initial electrolyte amount to remove the overflowed electrolyte, the critical capacity of the overflowed electrolyte when the battery can normally form the passivation film layer is related to the number of batteries in the formation process and the initial electrolyte amount, that is, the above-mentioned first capacity threshold may be determined according to the number of batteries in the formation process and the initial electrolyte amount.
Alternatively, the first capacity threshold may satisfy the following formula:
X 0 <a*n*L 0 *b
wherein X is 0 For the first capacity threshold, n is the number of cells in the formation process, L 0 For the initial electrolyte volume, b is the theoretical loss tangent, and a is the correction constant of the theoretical loss tangent in the actual formation process.
It will be appreciated that by L as described above 0 * The equation b.times.n.times.a can be calculated to obtain the maximum volume of spilled electrolyte during formation, in some embodiments L can be as described above 0 * The result of the equation b x n x a is the maximum capacity of the liquid collection container.
Illustratively, taking the first capacity threshold value as half of the maximum capacity of the liquid collecting container as an example, during the formation, when the capacity of the overflowed electrolyte obtained by the controller reaches half of the maximum capacity of the liquid collecting container, the controller controls the negative pressure system to reduce the extraction speed of the overflowed electrolyte during the battery formation.
In the battery formation method, the capacity of overflowed electrolyte in the liquid collecting container is obtained; when the capacity of the overflowed electrolyte reaches a first capacity threshold, the extraction speed of the overflowed electrolyte in the formation process is reduced, so that the battery can normally form a passivation film layer in the formation process. Compared with the prior art, the electrolyte loss condition of the battery is reflected through the capacity of overflowed electrolyte, and when the electrolyte capacity in the liquid collecting container is large, the large electrolyte loss of the formed battery is proved, so that the formation of the air suction negative pressure is regulated in real time, and the generation of defective batteries can be effectively avoided.
Fig. 4 is a schematic flow chart of a battery formation method according to an embodiment of the present application, and as shown in the drawing, the battery formation method may include the following steps:
in step S401, the controller obtains the volume of overflow electrolyte collected in the liquid collection container.
The execution manner of the step S401 is identical to the execution manner of the step S301, and will not be described here again.
In step S402, when the capacity of the overflowed electrolyte reaches a first capacity threshold, the controller controls the negative pressure system to reduce the negative pressure applied in the formation process, and the first capacity threshold is smaller than the critical capacity of the overflowed electrolyte when the battery can normally form the passivation film in the formation process.
It should be appreciated that the negative pressure system described above controls the air pressure of the internal environment of the entire battery formation apparatus, and when the applied negative pressure increases, the air pressure of the internal environment of the battery formation apparatus is reduced, resulting in an increase in the level of the electrolyte in the battery formation chamber; when the applied negative pressure is reduced, the air pressure of the internal environment of the battery formation device is increased, and the liquid level of the electrolyte in the battery formation bin is reduced. When the level of electrolyte in the cell formation chamber decreases, the electrolyte that overflows the cell formation chamber decreases, thereby reducing the extraction rate for the overflowed electrolyte during cell formation.
The execution manner of the step S402 is identical to the execution manner of the step S302, and will not be described here again.
In the battery formation method, the negative pressure applied in the formation process is reduced by controlling the negative pressure system to control the extraction speed of the overflowed electrolyte in the battery formation process, and the control parameter of the negative pressure system of the battery formation equipment is directly controlled to control the extraction speed of the overflowed electrolyte.
Fig. 5 is a schematic flow chart of a battery formation method according to an embodiment of the present application, and as shown in the drawing, the battery formation method may include the following steps:
in step S501, the controller obtains the volume of overflow electrolyte collected in the liquid collection container.
In step S502, when the capacity of the overflow electrolyte reaches a first capacity threshold, the controller controls the negative pressure system to reduce the extraction speed of the overflow electrolyte in the formation process of the battery, wherein the first capacity threshold is smaller than the critical capacity of the overflow electrolyte when the battery can normally form a passivation film layer in the formation process.
The execution mode of the steps S501 to S502 is identical to the execution mode of the steps S301 to S302, and will not be described here again.
In step S503, after the formation process is completed, when the capacity of the overflowed electrolyte in the liquid collecting container exceeds the preset second capacity threshold, the controller controls the negative pressure system to be ventilated with air, so as to remove the overflowed electrolyte in the connecting pipeline of the battery formation device.
Optionally, the specific value of the second capacity threshold is set by a person skilled in the art according to actual needs, so that the pipe cleaning is required when the capacity of the overflowed electrolyte in the liquid collecting container reaches the value, and the application is not limited, for example, when the capacity of the overflowed electrolyte in the liquid collecting container is found to exceed one third of the maximum capacity of the liquid collecting container after the formation process is completed, a part of the electrolyte is considered to be blocked in the pipe at this time, and at this time, the negative pressure system needs to be controlled to be filled with air for pipe cleaning so as to be ready for the next execution of the formation process.
Optionally, whether the formation process is finished or not may be determined according to whether the battery in the battery formation bin is taken out or not, and when the battery in the battery formation bin is taken out, the formation process is finished; when the battery in the battery formation bin is not taken out, the formation process is not completed. In some embodiments, the method of taking out the battery in the battery formation chamber may be determined according to the opening state of the door, and when the charge and discharge time of the battery in the battery formation chamber reaches the standard time, it is determined that the formation process is completed but not completed, and it is required to wait until the door of the battery formation chamber is changed from the opening state to the closing state, and then the formation process is considered to be completed.
It should be noted that, the embodiment for determining whether the battery in the battery formation compartment is taken out may be an existing method, and will not be described herein.
According to the battery formation method, after the formation process is finished, when the capacity of the overflowed electrolyte in the liquid collecting container exceeds the preset second capacity threshold, the controller controls the negative pressure system to be filled with air, so that the overflowed electrolyte in the connecting pipeline of the battery formation device is removed, the intelligent formation process is realized, the formation efficiency is improved, and the production cost is reduced.
Fig. 6 is a schematic flow chart of a battery formation method according to an embodiment of the present application, and as shown in the drawing, the battery formation method may include the following steps:
in step S601, the controller receives a detection result sent by the capacity sensor and indicating the capacity of the overflow electrolytic solution in the liquid collecting container.
Alternatively, the detection result may be sent in real time after the capacity sensor obtains the corresponding detection result each time, or may be sent after waiting for a preset time and calculating an average value in the time, or may be sent only after the capacity of the overflowed electrolyte in the liquid collecting container reaches the first capacity threshold.
Alternatively, an error interval may be set based on the first capacity threshold, and a plurality of extraction speeds may be set according to the error interval, so as to achieve adjustability of the extraction speed. For example, setting an upper error limit and a lower error limit of the error section based on the first capacity threshold, and when the capacity of the overflow electrolyte in the liquid collecting container reaches the lower error limit of the first capacity threshold, starting to reduce the extraction speed for the overflow electrolyte in the battery formation process at the first extraction speed; when the capacity of the overflowed electrolyte in the liquid collecting container reaches a first capacity threshold value, starting to reduce the extraction speed of the overflowed electrolyte in the battery formation process at a second extraction speed, wherein the second extraction speed is larger than the first extraction speed; when the capacity of the overflow electrolyte in the liquid collecting container reaches the error lower limit of the first capacity threshold, namely, the pumping speed of the overflow electrolyte in the battery formation process starts to be reduced at a third pumping speed, wherein the third pumping speed is larger than the second pumping speed.
The execution mode of the step S601 is identical to the execution mode of the step S301, and will not be described here again.
In step S602, when the capacity of the overflow electrolyte reaches a first capacity threshold, the controller controls the negative pressure system to reduce the extraction speed of the overflow electrolyte in the formation process of the battery, wherein the first capacity threshold is smaller than the critical capacity of the overflow electrolyte when the battery can normally form a passivation film layer in the formation process.
The execution manner of the step S602 is identical to the execution manner of the step S302, and will not be described here again.
In the battery formation method, the error interval is set based on the first capacity threshold, and the plurality of extraction speeds are set according to the error interval, so that the extraction speed can be adjusted, the formation efficiency is improved, and the production cost is reduced.
Fig. 7 is a schematic structural diagram of a battery formation device according to an embodiment of the present application, as shown in the foregoing fig. 2, the battery formation device may further include a first switch 16, where the first switch 16 is disposed between an air outlet of the gas-liquid separator 13 and the negative pressure system 15, so as to control an opening and closing state of an air outlet of the gas-liquid separator 13 and a passage where the negative pressure system 15 is located, so as to form a first passage among the battery formation chamber 12, the gas-liquid separator 13, the air pressure sensor 14 and the negative pressure system 15, and the controller 11 is electrically connected with the first switch 16.
Alternatively, the first switch 16 may be disposed between the air outlet of the gas-liquid separator 13 and the air pressure sensor 14, or may be disposed between the air pressure sensor 14 and the negative pressure system 15.
It should be understood that the switch type of the first switch may be selected by those skilled in the art according to actual needs, which is not limited in this application.
In the battery formation equipment, the first switch is arranged between the air outlet of the gas-liquid separator and the negative pressure system, and the controller is electrically connected with the first switch, so that the opening and closing states of the air outlet of the gas-liquid separator and the passage where the negative pressure system is positioned can be controlled, and the negative pressure is further adjustable.
Fig. 8 is a schematic flow chart of a battery formation method according to an embodiment of the present application, where the battery formation method may be applied to the battery formation apparatus shown in fig. 7, and as shown in the drawing, the battery formation method may include the following steps:
in step S801, the controller controls the first switch to be turned on.
Alternatively, the first switch may be turned off before step S801 is performed, that is, may be turned on when the battery formation method is started to be performed before the battery formation process is performed; or may be in an on state.
It should be understood that the negative pressure system is in the state of continuously applying negative pressure, so the negative pressure system is further controlled to apply negative pressure to the battery formation equipment by arranging the first switch so as to control the loss of liquid of electrolyte in the battery formation bin and reduce the production cost. When the controller receives a formation start instruction for indicating that the formation process is started, the first switch is switched to an on state, so that the inside of the battery formation equipment is in a negative pressure state.
In step S802, after the first switch is turned on, the controller controls the negative pressure system to start extracting the overflow electrolyte in the battery formation process.
It should be understood that step S802 described above is used to indicate that the formation process is started.
In step S803, the controller obtains the volume of overflow electrolyte collected in the liquid collection container.
In step S804, when the capacity of the overflow electrolyte reaches a first capacity threshold, the controller controls the negative pressure system to reduce the extraction speed of the overflow electrolyte in the formation process of the battery, wherein the first capacity threshold is smaller than the critical capacity of the overflow electrolyte when the battery can normally form a passivation film layer in the formation process.
The steps S803 to S804 are identical to the steps S301 to S302, and are not described in detail here.
In the battery formation method, the negative pressure system is further controlled to apply negative pressure to the battery formation equipment by arranging the first switch so as to control the liquid loss amount of the electrolyte in the battery formation bin and reduce the production cost.
Fig. 9 is a schematic flow chart of a battery formation method according to an embodiment of the present application, where the battery formation method may be applied to the battery formation apparatus shown in fig. 7, and as shown in the drawing, the battery formation method may include the following steps:
In step S901, the controller controls the first switch to an on state.
In step S902, the controller controls the negative pressure system to start to air in order to purge the overflow electrolyte in the connecting pipe of the battery formation apparatus.
It should be understood that, in the step S902, the first switch is turned on before the formation process is performed, and the negative pressure system is controlled to be ventilated to clean the overflow electrolyte in the connecting pipe of the battery formation device, and in some embodiments, the first switch may be turned off after the cleaning is completed, and the first switch may be turned on after receiving an instruction for indicating that the overflow electrolyte is started to be pumped.
In step S903, the controller controls the negative pressure system to start pumping the overflow electrolyte during the battery formation process.
It should be understood that the execution time of the above step S903 may be after a preset time for air to be introduced.
In step S904, the controller obtains the volume of overflow electrolyte collected in the liquid collecting container.
In step S905, when the capacity of the overflow electrolyte reaches a first capacity threshold, the controller controls the negative pressure system to reduce the extraction speed of the overflow electrolyte in the formation process of the battery, wherein the first capacity threshold is smaller than the critical capacity of the overflow electrolyte when the battery can normally form a passivation film in the formation process.
The execution manners of the steps S903 to S905 are identical to those of the steps S802 to S804, and are not described here again.
In the battery formation method, the first switch is controlled to be turned on before the battery formation process is executed, the negative pressure system is controlled to be introduced with air to clean overflowed electrolyte in the connecting pipeline of the battery formation equipment, and the first switch is turned off after the cleaning is completed, so that the connecting pipeline is cleaned before the battery formation process is executed.
Fig. 10 is a schematic structural diagram of a battery formation device according to an embodiment of the present application, as shown in the fig. 7, the battery formation device may further include a second switch 17, where the second switch 17 is connected in parallel with the first switch 16, and the second switch 17 is connected between an air outlet of the gas-liquid separator 13 and the negative pressure system 15 to form a second path between the battery formation chamber 12, the gas-liquid separator 13, the air pressure sensor 14 and the negative pressure system 15, and the controller 11 is electrically connected with the second switch 17.
It should be understood that the switch type of the second switch may be selected by those skilled in the art according to actual needs, which is not limited in this application.
In the battery formation equipment, the second switch is arranged between the air outlet of the gas-liquid separator and the negative pressure system, and the controller is electrically connected with the second switch, so that two openable and closable passages are formed between the air outlet of the gas-liquid separator and the negative pressure system, the extraction passage and the ventilation passage are separated, and negative pressure is further adjustable.
Fig. 11 is a schematic flow chart of a battery formation method according to an embodiment of the present application, where the battery formation method may be applied to the battery formation apparatus shown in fig. 10, and as shown in the drawing, the battery formation method may include the following steps:
in step S1101, the controller controls the second switch to be turned on.
In step S1102, after the second switch is turned on, the controller controls the negative pressure system to start introducing air, so that the introduced air passes through the second passage to remove the overflow electrolyte in the connecting pipeline of the battery formation device.
In step S1103, the controller controls the second switch to be turned off.
It should be understood that, in the steps S1101 to S1103, the first switch is turned off and the second switch is turned on in advance before the formation process is performed, so that the air introduced by the negative pressure system flows in from the channel opened by the second switch, thereby cleaning the overflow electrolyte in the connecting pipeline of the battery formation device, and turning off the second switch after the cleaning is completed.
In step S1104, the controller controls the first switch to the on state.
In step S1105, the controller controls the negative pressure system to start extracting the overflow electrolyte in the battery formation process.
In step S1106, the controller obtains the volume of overflow electrolyte collected in the liquid collection container.
In step S1107, when the capacity of the overflow electrolyte reaches a first capacity threshold, the controller controls the negative pressure system to reduce the extraction speed of the overflow electrolyte in the formation process of the battery, wherein the first capacity threshold is smaller than the critical capacity of the overflow electrolyte when the battery can normally form a passivation film layer in the formation process.
The execution modes of the steps S1104 to S1107 are identical to those of the steps S801 to S804, and will not be described here again.
In the battery formation method, the first switch is controlled to be closed and the second switch is controlled to be opened before the battery formation process is executed so as to form the ventilation passage, and the first switch is controlled to be opened to form the extraction passage when the battery formation process is executed, so that two openable passages are formed between the air outlet of the gas-liquid separator and the negative pressure system, the extraction passage and the ventilation passage are separated, and the negative pressure is further adjustable.
It should be understood that, although the steps in the flowcharts of fig. 1 to 11 are shown in order as indicated by the arrows, these steps are not necessarily performed in order as indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in fig. 1-11 may include multiple sub-steps or stages that are not necessarily performed at the same time, but may be performed at different times, nor does the order in which the sub-steps or stages are performed necessarily occur sequentially, but may be performed alternately or alternately with at least a portion of the sub-steps or stages of other steps or other steps.
Based on the foregoing embodiments, the embodiments of the present application provide a battery formation apparatus, which includes each module included, and each unit included in each module, and may be implemented by a processor; of course, the method can also be realized by a specific logic circuit; in an implementation, the processor may be a Central Processing Unit (CPU), a Microprocessor (MPU), a Digital Signal Processor (DSP), a Field Programmable Gate Array (FPGA), or the like.
Fig. 12 is a schematic structural diagram of a battery formation device provided in an embodiment of the present application, as shown in fig. 12, the battery formation device includes a controller, a liquid collecting container, a battery formation bin, a gas-liquid separator, a gas pressure sensor and a negative pressure system, a liquid outlet of the battery formation bin is connected with a liquid inlet of the gas-liquid separator, a liquid outlet of the gas-liquid separator is connected with a liquid inlet of the liquid collecting container, a gas outlet of the gas-liquid separator is connected with the negative pressure system through the gas pressure sensor, and the controller is used for controlling a pumping speed of the negative pressure system. The controller 11 may include:
a capacity obtaining module 110 for obtaining a capacity of the overflowed electrolyte in the liquid collecting container;
the extraction speed adjusting module 111 is configured to control the negative pressure system to reduce the extraction speed for the overflow electrolyte in the battery formation process when the capacity of the overflow electrolyte in the liquid collecting container reaches a first capacity threshold value, where the first capacity threshold value is smaller than the critical capacity of the overflow electrolyte in the liquid collecting container when the battery can normally form the passivation film layer in the formation process.
In one embodiment, the controller extraction speed adjustment module 111 may include:
and the negative pressure regulating submodule is used for controlling the negative pressure system to reduce the negative pressure applied in the formation process.
In one embodiment, the controller 11 may further include:
and the electrolyte cleaning module is used for controlling the negative pressure system to be introduced with air when the capacity of the overflowed electrolyte in the liquid collecting container exceeds a preset second capacity threshold after the formation process is finished so as to clean the overflowed electrolyte in the connecting pipeline of the battery formation equipment.
In one embodiment, the liquid collecting container is provided with a capacity sensor for detecting a capacity of the overflow electrolyte in the liquid collecting container, and the capacity obtaining module 110 may include:
and the detection result receiving sub-module is used for receiving the detection result sent by the capacity sensor and used for indicating the capacity of the overflowed electrolyte in the liquid collecting container.
In one embodiment, when a first switch is disposed between the air outlet of the gas-liquid separator and the negative pressure system, the controller may further include:
the first switch control module is used for controlling the first switch to be opened before the capacity of the overflowed electrolyte in the liquid collecting container is obtained;
And the electrolyte extraction module is used for controlling the negative pressure system to start to extract overflowed electrolyte in the battery formation process after the first switch is started.
In one embodiment, the controller 11 may further include:
and the electrolyte cleaning module is also used for controlling the negative pressure system to start to be introduced with air before controlling the negative pressure system to start to extract overflowed electrolyte in the battery formation process so as to clean the overflowed electrolyte in the connecting pipeline of the battery formation equipment.
In one embodiment, when a second switch is further disposed between the gas-liquid separator and the negative pressure system, and the second switch is connected with the first switch in parallel, the second switch is turned on to form a second path between the battery formation bin, the gas-liquid separator, the air pressure sensor and the negative pressure system, and the controller further includes:
the second switch control module is used for controlling the second switch to be turned on before controlling the first switch to be turned on;
the electrolyte cleaning module is also used for controlling the negative pressure system to start to introduce air after the second switch is turned on so that the introduced air passes through the second passage to clean overflowed electrolyte in the connecting pipeline of the battery formation equipment;
the second switch control module is also used for controlling the second switch to be closed after the second switch is opened for a preset time.
The description of the apparatus embodiments above is similar to that of the method embodiments above, with similar advantageous effects as the method embodiments. For technical details not disclosed in the device embodiments of the present application, please refer to the description of the method embodiments of the present application for understanding.
It should be noted that, in the embodiment of the present application, the division of the modules by the battery formation device shown in fig. 12 is schematic, and is merely a logic function division, and there may be another division manner in actual implementation. In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units. Or in a combination of software and hardware.
It should be noted that, in the embodiment of the present application, if the method is implemented in the form of a software functional module, and sold or used as a separate product, the method may also be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the embodiments of the present application may be essentially or part contributing to the related art, and the computer software product may be stored in a storage medium, including several instructions for causing an electronic device to execute all or part of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read Only Memory (ROM), a magnetic disk, an optical disk, or other various media capable of storing program codes. Thus, embodiments of the present application are not limited to any specific combination of hardware and software.
The embodiment of the application provides a computer device, which may be a server, and an internal structure diagram thereof may be shown in fig. 13. The computer device includes a processor, a memory, and a network interface connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, computer programs, and a database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The database of the computer device is for storing data. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to implement a battery formation method.
The present embodiment provides a computer-readable storage medium, on which a computer program is stored, which when executed by a processor, implements the steps of the method provided in the above embodiment.
The present application provides a computer program product comprising instructions which, when run on a computer, cause the computer to perform the steps of the method provided by the method embodiments described above.
It will be appreciated by those skilled in the art that the structure shown in fig. 13 is merely a block diagram of a portion of the structure associated with the present application and is not limiting of the computer device to which the present application applies, and that a particular computer device may include more or fewer components than shown, or may combine some of the components, or have a different arrangement of components.
In one embodiment, the battery formation method provided herein may be implemented in the form of a computer program that is executable on a computer device as shown in fig. 13. The memory of the computer device may store the various program modules that make up the battery-operated device. The computer program constituted by the respective program modules causes the processor to execute the steps in the battery formation method of the respective embodiments of the present application described in the present specification.
It should be noted here that: the description of the storage medium and apparatus embodiments above is similar to that of the method embodiments described above, with similar benefits as the method embodiments. For technical details not disclosed in the storage medium, storage medium and device embodiments of the present application, please refer to the description of the method embodiments of the present application for understanding.
It should be appreciated that reference throughout this specification to "one embodiment" or "an embodiment" or "some embodiments" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" or "in some embodiments" in various places throughout this specification are not necessarily referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. It should be understood that, in various embodiments of the present application, the sequence numbers of the foregoing processes do not mean the order of execution, and the order of execution of the processes should be determined by the functions and internal logic thereof, and should not constitute any limitation on the implementation process of the embodiments of the present application. The foregoing embodiment numbers of the present application are merely for describing, and do not represent advantages or disadvantages of the embodiments. The foregoing description of various embodiments is intended to highlight differences between the various embodiments, which may be the same or similar to each other by reference, and is not repeated herein for the sake of brevity.
The term "and/or" is herein merely an association relation describing associated objects, meaning that there may be three relations, e.g. object a and/or object B, may represent: there are three cases where object a alone exists, object a and object B together, and object B alone exists.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
In the several embodiments provided in this application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above-described embodiments are merely illustrative, and the division of the modules is merely a logical function division, and other divisions may be implemented in practice, such as: multiple modules or components may be combined, or may be integrated into another system, or some features may be omitted, or not performed. In addition, the various components shown or discussed may be coupled or directly coupled or communicatively coupled to each other via some interface, whether indirectly coupled or communicatively coupled to devices or modules, whether electrically, mechanically, or otherwise.
The modules described above as separate components may or may not be physically separate, and components shown as modules may or may not be physical modules; can be located in one place or distributed to a plurality of network units; some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional module in each embodiment of the present application may be integrated in one processing unit, or each module may be separately used as one unit, or two or more modules may be integrated in one unit; the integrated modules may be implemented in hardware or in hardware plus software functional units.
Those of ordinary skill in the art will appreciate that: all or part of the steps for implementing the above method embodiments may be implemented by hardware related to program instructions, and the foregoing program may be stored in a computer readable storage medium, where the program, when executed, performs steps including the above method embodiments; and the aforementioned storage medium includes: a mobile storage device, a Read Only Memory (ROM), a magnetic disk or an optical disk, or the like, which can store program codes.
Alternatively, the integrated units described above may be stored in a computer readable storage medium if implemented in the form of software functional modules and sold or used as a stand-alone product. Based on such understanding, the technical solutions of the embodiments of the present application may be essentially or part contributing to the related art, and the computer software product may be stored in a storage medium, including several instructions for causing an electronic device to execute all or part of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a removable storage device, a ROM, a magnetic disk, or an optical disk.
The methods disclosed in the several method embodiments provided in the present application may be arbitrarily combined without collision to obtain a new method embodiment.
The features disclosed in the several product embodiments provided in the present application may be combined arbitrarily without conflict to obtain new product embodiments.
The features disclosed in the several method or apparatus embodiments provided in the present application may be arbitrarily combined without conflict to obtain new method embodiments or apparatus embodiments.
The foregoing is merely an embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes and substitutions are intended to be covered in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (11)
1. A battery formation method, characterized by being applied to a battery formation apparatus including a liquid collecting container, a negative pressure system, and a controller, the negative pressure system being connected to the liquid collecting container, the controller being connected to the negative pressure system, the controller being configured to control a pumping speed of electrolyte overflowed during a battery formation by the negative pressure system, the liquid collecting container being configured to collect the pumped overflowed electrolyte during the battery formation, the method comprising:
the controller obtains the capacity of the overflowed electrolyte collected in the liquid collecting container;
when the capacity of the overflowed electrolyte in the liquid collecting container reaches a first capacity threshold value, the controller controls the negative pressure system to reduce the extraction speed of the overflowed electrolyte in the battery formation process, wherein the first capacity threshold value is smaller than the critical capacity of the overflowed electrolyte in the liquid collecting container when the battery can form a passivation film layer in the formation process;
The battery formation equipment further comprises a battery formation bin, a gas-liquid separator and a gas pressure sensor, a liquid outlet of the battery formation bin is connected with a liquid inlet of the gas-liquid separator, a liquid outlet of the gas-liquid separator is connected with a liquid inlet of the liquid collecting container, a gas outlet of the gas-liquid separator is connected with the negative pressure system through the gas pressure sensor, a first switch is arranged between the gas outlet of the gas-liquid separator and the negative pressure system, a first passage is formed between the battery formation bin, the gas-liquid separator, the gas pressure sensor and the negative pressure system after the first switch is opened, and before the controller obtains the capacity of overflowed electrolyte collected in the liquid collecting container, the method further comprises the steps of:
the controller controls the first switch to be turned on;
after the first switch is started, the controller controls the negative pressure system to start extracting overflowed electrolyte in the battery formation process;
the device comprises a battery formation bin, a gas-liquid separator, a gas pressure sensor and a negative pressure system, wherein a second switch is further arranged between the gas-liquid separator and the negative pressure system, the second switch is connected with the first switch in parallel, a second passage between the battery formation bin, the gas-liquid separator, the gas pressure sensor and the negative pressure system is formed after the second switch is started, and the controller is used for controlling the first switch to be started, and the method further comprises the following steps:
The controller controls the second switch to be turned on;
after the second switch is turned on, the controller controls the negative pressure system to start to introduce air so that the introduced air passes through the second passage to remove the overflowed electrolyte in the connecting pipeline of the battery formation equipment;
the controller controls the second switch to be closed after the second switch is opened for a preset time.
2. The method of claim 1, wherein the first capacity threshold is determined based on a number of cells in the formation process and an initial amount of electrolyte.
3. The method of any of claims 1-2, wherein the controller controlling the negative pressure system to reduce the extraction rate for spilled electrolyte during battery formation comprises:
the controller controls the negative pressure system to reduce the negative pressure applied in the formation process.
4. The method of claim 1, wherein the method further comprises:
after the formation process is finished, when the capacity of the overflowed electrolyte in the liquid collecting container exceeds a preset second capacity threshold, the controller controls the negative pressure system to be filled with air so as to remove the overflowed electrolyte in the connecting pipeline of the battery formation equipment.
5. The method of claim 1, wherein a capacity sensor is disposed in the liquid collection container, the capacity sensor for detecting a capacity of the overflow electrolyte in the liquid collection container; the controller obtains the volume of spilled electrolyte collected in the liquid collection container, comprising:
the controller receives a detection result sent by the capacity sensor and used for indicating the capacity of the overflowed electrolyte in the liquid collecting container.
6. The method of claim 1, wherein the controller, after the first switch is turned on, controls the negative pressure system to begin pumping overflow electrolyte during the battery formation, the method further comprising:
the controller controls the negative pressure system to start to be filled with air so as to remove the overflowed electrolyte in the connecting pipeline of the battery formation equipment.
7. The utility model provides a battery formation equipment, its characterized in that, battery formation equipment includes controller, liquid collecting container, battery formation storehouse, gas-liquid separator, air pressure sensor and negative pressure system, the liquid outlet in battery formation storehouse with gas-liquid separator's inlet connection, gas-liquid separator's liquid outlet with liquid collecting container's inlet connection, gas-liquid separator's gas outlet is through air pressure sensor with negative pressure system connects, the controller is used for controlling negative pressure system's extraction rate, the controller includes:
A capacity obtaining module for obtaining a capacity of the overflow electrolyte in the liquid collecting container;
the extraction speed adjusting module is used for controlling the negative pressure system to reduce the extraction speed of the overflow electrolyte in the battery formation process when the capacity of the overflow electrolyte in the liquid collecting container reaches a first capacity threshold value, wherein the first capacity threshold value is smaller than the critical capacity of the overflow electrolyte in the liquid collecting container when the battery can form a passivation film layer in the formation process;
wherein be provided with first switch between gas-liquid separator's gas outlet with negative pressure system, first switch opens the back and forms battery formation storehouse, gas-liquid separator, atmospheric pressure sensor with first passageway between the negative pressure system, the controller still includes:
a first switch control module for controlling the first switch to be turned on before the capacity of the overflowed electrolyte in the liquid collecting container is obtained;
the electrolyte extraction module is used for controlling the negative pressure system to start to extract overflowed electrolyte in the battery formation process after the first switch is started;
the gas-liquid separator and the negative pressure system are connected in parallel, the second switch is opened to form a second passage between the battery formation bin, the gas-liquid separator and the air pressure sensor and the negative pressure system, and the controller further comprises:
The second switch control module is used for controlling the second switch to be turned on before controlling the first switch to be turned on;
the electrolyte cleaning module is used for controlling the negative pressure system to start to be introduced with air after the second switch is started so that the introduced air passes through the second passage to clean the overflow electrolyte in the connecting pipeline of the battery formation equipment;
the second switch control module is further configured to control the second switch to be turned off after the second switch is turned on for a preset time.
8. The battery formation apparatus according to claim 7, wherein the extraction speed adjustment module includes:
and the negative pressure regulating submodule is used for controlling the negative pressure system to reduce the negative pressure applied in the formation process.
9. The battery formation apparatus of claim 7, wherein the electrolyte cleaning module is further configured to:
after the formation process is finished, when the capacity of the overflowed electrolyte in the liquid collecting container exceeds a preset second capacity threshold, the controller controls the negative pressure system to be filled with air so as to remove the overflowed electrolyte in the connecting pipeline of the battery formation equipment.
10. The battery formation apparatus according to claim 7, wherein a capacity sensor for detecting a capacity of the overflow electrolyte in the liquid collecting container is provided in the liquid collecting container, the capacity obtaining module comprising:
and the detection result receiving sub-module is used for receiving the detection result sent by the capacity sensor and used for indicating the capacity of the overflowed electrolyte in the liquid collecting container.
11. The battery formation apparatus of claim 7, wherein the electrolyte cleaning module is further configured to:
before the negative pressure system is controlled to start extracting the overflowed electrolyte in the battery formation process, the negative pressure system is controlled to start introducing air so as to remove the overflowed electrolyte in the connecting pipeline of the battery formation equipment.
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| CN108923074A (en) * | 2018-08-20 | 2018-11-30 | 江苏金帆电源科技有限公司 | Negative pressure formation equipment and negative pressure formation method for lithium battery |
| CN208970681U (en) * | 2018-09-12 | 2019-06-11 | 合肥国轩高科动力能源有限公司 | Negative pressure formation device for lithium ion battery |
| CN210607529U (en) * | 2019-09-17 | 2020-05-22 | 南京国轩新能源有限公司 | Evacuation exhaust apparatus after lithium ion battery formation |
| CN112713367A (en) * | 2021-01-11 | 2021-04-27 | 湖北亿纬动力有限公司 | Device for improving liquid loss of battery and formation method |
| CN112615058A (en) * | 2021-01-12 | 2021-04-06 | 厦门海辰新能源科技有限公司 | Soft package formation machine and use method thereof |
| CN214706003U (en) * | 2021-02-04 | 2021-11-12 | 成都市银隆新能源有限公司 | Battery formation gas collection clamp |
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