CN115764200A - Liquid injection method and liquid injection equipment - Google Patents
Liquid injection method and liquid injection equipment Download PDFInfo
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- CN115764200A CN115764200A CN202310023191.2A CN202310023191A CN115764200A CN 115764200 A CN115764200 A CN 115764200A CN 202310023191 A CN202310023191 A CN 202310023191A CN 115764200 A CN115764200 A CN 115764200A
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- electrolyte
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- liquid injection
- injection method
- buffer cup
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- 238000000034 method Methods 0.000 title claims abstract description 93
- 239000007788 liquid Substances 0.000 title claims abstract description 88
- 238000002347 injection Methods 0.000 title claims abstract description 86
- 239000007924 injection Substances 0.000 title claims abstract description 86
- 239000003792 electrolyte Substances 0.000 claims abstract description 156
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 28
- 238000005086 pumping Methods 0.000 claims description 6
- 238000005265 energy consumption Methods 0.000 abstract description 8
- 230000001502 supplementing effect Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000029058 respiratory gaseous exchange Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012795 verification 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
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- Filling, Topping-Up Batteries (AREA)
Abstract
The application provides a liquid injection method and liquid injection equipment, wherein the liquid injection method comprises the following steps: injecting electrolyte with a set volume into the battery; and carrying out formation on the battery, and filling electrolyte into the battery in the formation process. In the scheme, the electrolyte is injected into the battery in the formation process, so that the process of the electrolyte injection process is reduced, and the risk of spilling the electrolyte is reduced. In addition, the pollution risk to equipment is reduced, the energy consumption is reduced, and the efficiency is improved.
Description
Technical Field
The application relates to the technical field of batteries, in particular to a liquid injection method and liquid injection equipment.
Background
The liquid scheme is annotated to tradition divide into once annotate liquid and annotate two steps of liquid with the secondary and annotate liquid, and specific notes liquid process includes: primary liquid injection, high-temperature standing, formation, secondary liquid injection and the like. In the above processes, a large amount of electrolyte is often spilled in the intermediate process between primary injection and secondary injection, which pollutes equipment and limits the energy consumption and efficiency of the current company production line.
Disclosure of Invention
The application provides a liquid injection method and liquid injection equipment, which are used for improving the liquid injection effect of electrolyte.
In a first aspect, a liquid injection method is provided, which includes the following steps:
injecting electrolyte with a set volume into the battery;
and carrying out formation on the battery, and filling electrolyte into the battery in the formation process.
In the scheme, the electrolyte is injected into the battery in the formation process, so that the process of the electrolyte injection process is reduced, and the risk of spilling the electrolyte is reduced. In addition, the pollution risk to equipment is reduced, the energy consumption is reduced, and the efficiency is improved.
In a second aspect, a liquid injection device is provided, which includes an electrolyte buffer cup for storing electrolyte, wherein the electrolyte buffer cup has a cavity for accommodating the electrolyte;
the negative pressure pipeline is inserted into the electrolyte buffer cup, is communicated with a liquid injection port of the battery and can vacuumize the battery; wherein, the electrolyte buffer cup is used for injecting electrolyte into the battery.
In the scheme, the electrolyte is injected into the battery in the formation process, so that the process of the electrolyte injection process is reduced, and the risk of spilling the electrolyte is reduced. In addition, the pollution risk to equipment is reduced, the energy consumption is reduced, and the efficiency is improved.
Drawings
FIG. 1 is a flow diagram of a prior art battery electrolyte injection process;
fig. 2 is a flowchart of a liquid injection method provided in an embodiment of the present application;
fig. 3 is a schematic structural diagram of a liquid injection device provided in an embodiment of the present application.
Detailed Description
The present application will be described in further detail below with reference to the accompanying drawings and examples. The features and advantages of the present application will become more apparent from the description.
The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
In addition, the technical features described below in the different embodiments of the present application may be combined with each other as long as they do not conflict with each other.
To facilitate understanding of the liquid injection method provided in the embodiment of the present application, an application scenario of the liquid injection method is first described. The electrolyte injection method provided by the embodiment of the application is used for injecting electrolyte into a battery. When liquid injection is carried out in the production process of the current battery, a plurality of working procedures are needed, and the risk of spilling electrolyte is increased. Therefore, the embodiment of the application provides an electrolyte injection method for improving the electrolyte injection effect of electrolyte. The following detailed description is given with reference to the accompanying drawings and examples.
In order to facilitate understanding of the electrolyte injection method provided by the embodiment of the application, the procedures involved in the electrolyte injection process of the battery are introduced. Referring to fig. 1, fig. 1 illustrates a flow chart in some of the injection processes to which the present application relates. The battery liquid injection process comprises the steps of primary liquid injection, high-temperature standing, plug sealing in the process of pulling, formation and the like. In the specific process, part of electrolyte is injected into the battery in the primary electrolyte injection procedure, then the electrolyte injection port of the battery is sealed by the process sealing rubber plug, and the battery is subjected to high-temperature standing. After standing at high temperature, the process sealing rubber plug is pulled out from the liquid injection port to be formed, and secondary liquid injection is carried out on the battery after formation.
Referring to fig. 2, fig. 2 shows a flow involved in a liquid injection method provided in an embodiment of the present application. The liquid injection method provided by the embodiment of the application comprises the following steps:
step 001: injecting electrolyte with a set volume into the battery;
specifically, annotate the liquid in-process, at first take out the negative pressure to the battery, specifically, the negative pressure: the pressure is less than or equal to-70 KPa, and the negative pressure pumping time is 30s; illustratively, the negative pressure is different negative pressures such as-70 KPa, -80KPa, -90KPa, etc.
After the negative pressure is pumped out of the battery, the battery is pressurized, and the pressurization adopts a high positive pressure circulating liquid injection process, so that the electrolyte can be injected into the battery more quickly. In the pressurization process, the applied positive pressure is 100 to 600KPa, and the pressurization time is 30 to 150s. As an example, at the time of pressurization, the pressurization may be different pressures of 100KPa, 200KPa, 300KPa, 400KPa, 500KPa, 600KPa, and the like. The pressing time may be 30s, 50s, 70s, 90s, 120s, 150s, etc. different times. In addition, in the pressurization, the larger the pressurization pressure is, the shorter the corresponding pressurization time is.
When the electrolyte is injected into the battery, the injection amount at one time needs to satisfy: h is less than or equal to 90 percent of the total amount of the electrolyte with the minimum amount required by formation; wherein h is a set capacity. In addition, the total amount of the electrolyte is the content of the electrolyte when the battery is filled with the electrolyte, and for example, when the content of the electrolyte when the battery is filled with the electrolyte is H, H is less than or equal to 90% of H, for example, H can be 50% of H, 60% of H, 70% of H, 80% of H and 90% of H. The minimum amount of electrolyte required for formation refers to the minimum amount of electrolyte required to be flushed into the battery when the formation process can normally operate. When the mode is adopted, the injected electrolyte is less, so that the process time and pressure of the high-positive-pressure circulating injection process can be reduced, and the equipment cost and the energy consumption cost are reduced.
As an alternative, h satisfies: h is not more than 50 percent of the total amount of the electrolyte and not more than 70 percent of the total amount of the electrolyte. Illustratively, H can be different levels of 50% H, 55% H, 60% H, 65% H, 70% H, and so forth. When the method is adopted, the process time and pressure of the high-positive-pressure circulating liquid injection process are further reduced, and the equipment cost and the energy consumption cost are reduced.
Step 002: and (4) forming the battery, and filling the battery with electrolyte in the forming process.
Specifically, the formation refers to a first charging process of the battery after the lithium battery is filled with liquid. In the formation process of the battery, the battery is vacuumized and charged.
Illustratively, the step of forming includes: intermittent vacuum pumping is adopted for the battery; intermittent charging is adopted for the battery. Wherein, when the vacuum pumping and the charging are carried out, the battery is alternately charged and vacuumized. During the specific vacuumizing and charging, the battery is firstly vacuumized, and after the vacuumizing is finished, the battery is charged. Specifically, after charging each time, the vacuum degree in the battery is set to 0. After that, the battery is again evacuated.
In the embodiment of the application, the battery is filled with liquid in the formation process. Therefore, the processes of vacuumizing and injecting the battery are simultaneously implemented. The details will be described below.
Referring to fig. 3, fig. 3 shows a schematic structural diagram of the liquid injection device 10 provided in the embodiment of the present application. The filling device 10 includes an electrolyte buffer cup 11, and the electrolyte buffer cup 11 has a liquid outlet matching with the filling port 21 of the battery 20. When specifically cooperating, sealed intercommunication between liquid outlet and the notes liquid mouth 21, if through setting up sealed the pad on the liquid outlet, support through sealed the pad and press and annotate liquid mouth 21 to make both sealed intercommunications.
In addition, electrolyte buffer memory cup 11 has the cavity that holds electrolyte, and this cavity and liquid outlet intercommunication. When electrolyte is injected into the battery 20, the electrolyte in the cavity can flow into the battery 20.
The electrolyte buffer cup 11 is also connected with a negative pressure pipeline 12, and the negative pressure pipeline 12 is inserted into the cavity in the electrolyte buffer cup 11 and is used for communicating with the liquid injection port 21 of the battery 20. The negative pressure conduit 12 communicates with the above-mentioned vacuum evacuation device for evacuating the battery 20.
Still be provided with an electrolyte delivery pipe 14 on the electrolyte buffer memory cup 11 that this application embodiment provided, this electrolyte delivery pipe 14 is used for carrying electrolyte to the cavity of electrolyte buffer memory cup 11.
In a specific arrangement, the negative pressure pipeline 12 is provided with a first control valve 15, and the electrolyte delivery pipeline 14 is provided with a second control valve 13. Wherein the first control valve 15 can control the conduction of the negative pressure pipeline 12, and the second control valve 13 can control the conduction of the electrolyte conveying pipeline 14. The first control valve 15 and the second control valve 13 may be solenoid valves or manual on-off valves, and may be set according to requirements. The present embodiment is not particularly limited.
When the battery is filled with electrolyte, the electrolyte is injected into the battery through the following steps:
a, step a: injecting electrolyte into the electrolyte buffer cup 11;
specifically, in specific use, the second control valve 13 is closed first to close the electrolyte delivery pipe 14. Thereafter, the first control valve 15 is opened and the negative pressure line 12 is opened to evacuate the cell with which the electrolysis buffer cup is connected. Then, the first control valve 15 is closed again to close the negative pressure pipeline 12, and the second control valve 13 is opened again to allow the electrolyte to flow into the electrolyte buffer cup 11 under the action of gravity and negative pressure for storage.
When the negative pressure is extracted specifically, the electrolyte conveying pipeline 14 is closed firstly, and the negative pressure is extracted from the battery and the buffer cup to be less than or equal to-70 KPa;
the negative pressure pipeline 12 is closed, the electrolyte conveying pipeline 14 is synchronously opened, and the rest part of the total electrolyte injection amount is injected into the electrolyte buffer cup 11.
Step b: electrolyte is injected into the battery during the formation process of the battery through the electrolyte buffer cup 11.
In a specific injection process, injecting electrolyte into the electrolyte buffer cup 11; then the electrolyte is injected into the battery through the electrolyte buffer cup 11 in the battery formation process.
Combining the formation process. When the electrolyte is injected specifically, the electrolyte may be injected into the battery by using the negative pressure in the battery and the weight of the electrolyte when the battery is evacuated.
When annotating the liquid to the battery, can adopt the breathing type to annotate the liquid, this annotate the liquid mode for every time when the evacuation, all annotate the liquid to the battery. The following is a detailed description.
Electrolyte is injected into the cell at each vacuum pumping. Illustratively, each time the battery is evacuated, the electrolyte in the electrolyte buffer cup 11 can be charged into the battery under the negative pressure and the weight of the electrolyte.
During the specific filling of the electrolyte, the following steps can be carried out:
step c: the electrolyte delivery conduit 14 is closed and the battery is charged. During charging, opening the negative pressure pipe 12, pumping negative pressure to less than or equal to-70 KPa, until electric quantity 10% SOC; during charging, the electrolyte flows into the cell under the influence of negative pressure.
Step d: releasing the vacuum, and standing for 3 to 10min at normal pressure;
and c, circularly performing the step c and the step d until the battery capacity reaches the target value.
In the above steps, when the battery is charged, every time the battery is pumped to negative pressure, electrolyte will flow into the battery from the electrolyte buffer cup 11 until the battery is fully charged.
When the amount of charge of the battery is 10% osc in the specific charging of the electrolyte, the electrolyte is filled into the battery through the electrolyte buffer cup 11.
Specifically, as shown in table 1, table 1 shows a specific electrolyte injection process.
TABLE 1
In the above scheme, the electrolyte is injected into the battery when the battery is charged to 10% soc, and in the subsequent process, the electrolyte is continuously injected following the evacuation of the battery.
Since the electrolyte solution is injected smoothly into the cell as the charge amount of charge increases during the entire charging process, the solution replenishing step can be performed after the charging 10% soc gas generation is completed.
When the electrolyte is supplemented into the battery in the mode, the whole verification process of the dynamic electrolyte supplementing formed is more than 10g of electrolyte injection and stable in liquid supplementing effect compared with a production line, so that compared with the prior art, the mode (dynamic electrolyte supplementing effect capacity) for supplementing the electrolyte disclosed by the application is greater than the secondary electrolyte injection and supplementing capacity.
In order to facilitate understanding of the scheme provided by the embodiment of the application, when the liquid injection is carried out by adopting the liquid injection method with L300N218B as the blue, on the premise of a high-pressure and isobaric liquid injection mode, the primary liquid injection time is reduced from 490g to 470g, the primary liquid injection time is reduced by 5-6 min, and the primary liquid injection efficiency is improved by about 25%, and similarly, with L300F177A as the blue, the primary liquid injection time can be reduced from 530g to 510g, the primary liquid injection time is reduced by 5-6 min, and the primary liquid injection efficiency is improved by about 20%. By taking L300N218B as a blueprint, on the premise of a high-pressure isobaric liquid injection mode, the liquid injection time for one time is reduced from 490g to 470g, the liquid injection time for one time is reduced by 3min, and the liquid injection efficiency for one time is improved by about 13%. From the above description, it can be seen that, after the liquid injection method of the present application is adopted, the electrolyte amount of one-time liquid injection can be greatly reduced, and at the same time, the efficiency of one-time liquid injection can be improved. And during secondary liquid injection, the method is carried out in the formation process of the battery without extra time, so that the liquid injection efficiency of the battery can be greatly improved, and the production efficiency of the battery is improved.
It should be understood that conventional steps such as standing at high temperature and pulling out the sealing rubber plug can be further included between the steps 001 and 002 provided in the embodiments of the present application. Details are not described in the embodiments of the present application.
As can be seen from the above description, in the method provided in the embodiment of the present application, the electrolyte is injected into the battery during the formation process, so that the processes of the electrolyte injection process are reduced, and the risk of spilling the electrolyte is reduced. In addition, the pollution risk to equipment is reduced, the energy consumption is reduced, and the efficiency is improved.
Referring to fig. 3, an embodiment of the present application further provides a liquid filling apparatus 10, where the liquid filling apparatus 10 includes an electrolyte buffer cup 11, and the electrolyte buffer cup 11 has a liquid outlet matching with the liquid filling port 21 of the battery 20. When specifically cooperating, sealed intercommunication between liquid outlet and the notes liquid mouth 21, if through setting up sealed the pad on the liquid outlet, support through sealed the pad and press and annotate liquid mouth 21 to make both sealed intercommunications.
In addition, electrolyte buffer memory cup 11 has the cavity that holds electrolyte, and this cavity and liquid outlet intercommunication. When electrolyte is injected into the battery 20, the electrolyte in the cavity can flow into the battery 20.
The electrolyte buffer cup 11 is also connected with a negative pressure pipeline 12, and the negative pressure pipeline 12 is inserted into the cavity in the electrolyte buffer cup 11 and is used for communicating with the liquid injection port 21 of the battery 20. The negative pressure conduit 12 communicates with the above-mentioned vacuum evacuation device for evacuating the battery 20.
An electrolyte delivery pipe 14 is further disposed on the electrolyte buffer cup 11 provided in the embodiment of the present application, and the electrolyte delivery pipe 14 is configured to deliver electrolyte into the cavity of the electrolyte buffer cup 11.
In a specific arrangement, the negative pressure pipeline 12 is provided with a first control valve 15, and the electrolyte delivery pipeline 14 is provided with a second control valve 13. Wherein the first control valve 15 can control the conduction of the negative pressure pipeline 12, and the second control valve 13 can control the conduction of the electrolyte conveying pipeline 14. The first control valve 15 and the second control valve 13 may be solenoid valves or manual on-off valves, and may be set according to requirements. The embodiments of the present application are not particularly limited.
The usage of the liquid injection device 10 can refer to the related description in the method, and is not described in detail here. In the above scheme, the electrolyte is injected into the battery 20 in the formation process, so that the processes of the electrolyte injection process are reduced, and the risk of spilling the electrolyte is reduced. In addition, the pollution risk to equipment is reduced, the energy consumption is reduced, and the efficiency is improved.
In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "left", "right", and the like indicate orientations or positional relationships based on operational states of the present application, and are only used for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application.
In the description of the present application, it is to be noted that the terms "mounted," "connected," and "connected" are to be construed broadly unless otherwise explicitly stated or limited. The specific meaning of the above terms in this application will be understood to be a specific case for those of ordinary skill in the art.
The present application has been described above with reference to preferred embodiments, but these embodiments are merely exemplary and merely illustrative. On the basis of the above, the present application can be subjected to various substitutions and modifications, which are all within the scope of protection of the present application.
Claims (10)
1. A liquid injection method is characterized by comprising the following steps:
injecting electrolyte with a set volume into the battery;
and carrying out formation on the battery, and filling electrolyte into the battery in the formation process.
2. The liquid injection method according to claim 1, wherein the set capacity satisfies:
the minimum amount of electrolyte is formed, h is less than or equal to 90 percent of the total amount of the electrolyte; the total amount of the electrolyte is the content of the electrolyte when the battery is filled with the electrolyte; h is the set capacity.
3. The liquid injection method according to claim 2, wherein the set capacity satisfies:
h is not more than 50 percent of the total amount of the electrolyte and not more than 70 percent of the total amount of the electrolyte.
4. The electrolyte injection method according to any one of claims 1 to 3, wherein the step of filling the battery with the electrolyte in the formation process specifically comprises the following steps:
injecting electrolyte into an electrolyte buffer cup;
injecting electrolyte into the battery in the battery formation process through the electrolyte buffer cup.
5. The liquid injection method according to claim 4, wherein the battery is formed; the method specifically comprises the following steps:
intermittently vacuumizing the battery;
the battery is charged intermittently.
6. The liquid injection method according to claim 5, wherein intermittent vacuum pumping is adopted for the battery; the battery is charged intermittently; the method specifically comprises the following steps:
and alternately charging and vacuumizing the battery.
7. The liquid injection method according to claim 6, wherein the battery is alternately charged and evacuated; the method specifically comprises the following steps:
after each charging, the vacuum degree in the battery is set to 0.
8. The electrolyte injection method according to claim 7, characterized in that electrolyte is injected into the battery through the electrolyte buffer cup during the formation process of the battery; the method specifically comprises the following steps:
and injecting electrolyte into the battery during each vacuumizing.
9. The electrolyte injection method according to claim 7, characterized in that electrolyte is injected into the battery through the electrolyte buffer cup during the formation process of the battery; the method specifically comprises the following steps:
filling the battery with electrolyte through the electrolyte buffer cup when charging the battery to 10% osc.
10. The liquid injection equipment is characterized by comprising an electrolyte buffer cup for storing electrolyte, wherein the electrolyte buffer cup is provided with a cavity for accommodating the electrolyte;
the negative pressure pipeline is inserted into the electrolyte buffer cup, is communicated with a liquid injection port of the battery and can vacuumize the battery.
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| CN202310023191.2A CN115764200A (en) | 2023-01-09 | 2023-01-09 | Liquid injection method and liquid injection equipment |
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| CN202310023191.2A CN115764200A (en) | 2023-01-09 | 2023-01-09 | Liquid injection method and liquid injection equipment |
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