CN109962305B - Lithium battery internal space verification method - Google Patents
Lithium battery internal space verification method Download PDFInfo
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- CN109962305B CN109962305B CN201910202470.9A CN201910202470A CN109962305B CN 109962305 B CN109962305 B CN 109962305B CN 201910202470 A CN201910202470 A CN 201910202470A CN 109962305 B CN109962305 B CN 109962305B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F22/00—Methods or apparatus for measuring volume of fluids or fluent solid material, not otherwise provided for
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/484—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring electrolyte level, electrolyte density or electrolyte conductivity
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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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Abstract
The device and the method for verifying the internal space of the lithium battery can solve the technical problem that the actual internal residual space of a battery which is not injected with liquid is inconsistent with theoretical calculation due to the fact that the actual volume of a solid material in the lithium battery has an error with the theoretical calculation. The device comprises an electrolyte container, wherein the electrolyte container is arranged above a battery to be tested, and the electrolyte container and the battery are arranged in a sealed cavity; the vacuum pumping valve is arranged outside the sealed cavity and communicated with the sealed cavity; the pressurization valve is arranged outside the sealed cavity and communicated with the sealed cavity; the vacuum meter is arranged outside the sealed cavity and communicated with the sealed cavity. According to the invention, negative pressure and positive pressure are alternately carried out, and the air in the battery which is not injected with liquid is replaced by the electrolyte of the lithium battery, so that the residual space in the battery which is not injected with liquid is completely filled with the electrolyte, and the residual space in the lithium battery which is not injected with liquid is measured and calculated, therefore, the efficiency is high, and the effect is good.
Description
Technical Field
The invention relates to the technical field of lithium battery processing technologies, in particular to a method for verifying an internal space of a lithium battery.
Background
The lithium ion battery is a novel high-energy battery successfully developed in the 20 th century. The high-voltage power supply has the advantages of high working voltage, high specific energy, no pollution, no memory effect, long service life and the like, and is widely applied to modern digital products such as mobile phones, notebooks and the like. In particular, in recent decades, lithium secondary batteries have been rapidly developed in the field of electric vehicles such as passenger cars and public buses.
The lithium ion battery has an important design and verification in the design development and process verification stages, namely the calculation and verification of the internal space of the finished lithium battery, the volume proportion of various materials of the battery in the finished lithium battery can be given through calculating various materials and porosity in the battery in the design development stage, after the volume occupied by various solid materials in the battery is theoretically calculated, the volume of the residual space needs to be calculated according to the total volume of a shell, a basis is provided for the electrolyte injection amount of the lithium battery, and the actual internal residual space of the battery which is not injected with the electrolyte does not accord with the theoretical calculation due to certain errors existing between the actual volume of various solid materials in the lithium battery and the theoretical calculation, and an accurate basis cannot be provided for the electrolyte injection amount of the lithium battery.
Disclosure of Invention
The device and the method for verifying the internal space of the lithium battery can solve the technical problem that the actual internal residual space of a non-injected battery is inconsistent with the theoretical calculation due to certain errors existing in the actual volumes and the theoretical calculation of various solid materials in the lithium battery.
In order to achieve the purpose, the invention adopts the following technical scheme:
a lithium battery internal space verification device comprises an electrolyte container, wherein the electrolyte container is arranged above a battery to be tested, a liquid outlet of the electrolyte container is connected with a liquid injection port of the battery, and the electrolyte container and the battery to be tested are arranged in a sealed cavity;
the vacuum pump is arranged outside the sealed cavity and communicated with the sealed cavity, and the vacuum pump is also connected with an external vacuum device;
the pressurization valve is arranged outside the sealed cavity and communicated with the sealed cavity, and the pressurization valve is connected with external compressed gas;
the vacuum meter is arranged outside the sealed cavity and communicated with the sealed cavity.
Further, the sealed cavity comprises a sealed cover body and a sealed cover, and the sealed cover is arranged above the sealed cover body.
Further, a sealing gasket is arranged between the sealing cover and the sealing cover body.
Furthermore, the sealing cover is provided with a buckle which is matched with the sealing cover body for use.
Further, the electrolyte container is fixed in the sealing cover body through a support.
Further, still include the base, battery and seal chamber are fixed respectively on the base.
Further, the base and the sealing cover body are designed integrally.
A lithium battery internal space verification method adopts the lithium battery internal space verification device and comprises the following steps:
s100, placing the battery to be tested into a sealing cover body,
s200, arranging a liquid outlet of the electrolyte container and a liquid injection port of the battery to be tested in a matched mode;
s300, quantitatively injecting electrolyte exceeding theoretical calculation into an electrolyte container;
s400, sealing the sealing cover, the sealing cover body and the sealing gasket;
s500, vacuumizing the whole sealing device through a vacuumizing valve and keeping the vacuumizing for a certain time;
s600, filling dry gas into the vacuumized device through a pressurizing valve to break vacuum and pressurize, so that electrolyte in an electrolyte container is injected into the battery;
s700, performing a plurality of times of circulating operation on the steps S500 and S600 to ensure that the residual space in the battery is completely filled with electrolyte;
s800, finishing the vacuumizing and pressurizing circulation operation, determining the residual electrolyte in the electrolyte container, and calculating the internal space of the battery without liquid injection by combining the total amount of the electrolyte injected into the initial electrolyte container;
further, the calculation formula for calculating the internal space of the battery without liquid injection in step S800 is as follows: internal space V ═ of unliquefied battery (initial electrolyte amount m)1Residual electrolytic quantity m2) The electrolyte density ρ.
According to the technical scheme, the lithium battery internal space verification device and the verification method are used for calculating and verifying the internal space of a finished lithium battery at the design development and process verification stages of the lithium battery, the volume proportion of various materials in the battery in the finished lithium battery can be given by calculating various materials and the porosity in the battery at the design development stage, after the volume occupied by various solid materials in the battery is theoretically calculated, the volume of the residual space needs to be calculated according to the total volume of a shell, a basis is provided for the electrolyte injection amount of the lithium battery, the actual internal residual space of the battery which is not injected with the electrolyte does not accord with the theoretical calculation due to certain error between the actual volume of various solid materials in the lithium battery and the theoretical calculation, and an accurate basis cannot be provided for the electrolyte injection amount of the lithium battery, the negative pressure and the positive pressure are alternately carried out, the air in the battery which is not, the method has the advantages that the electrolyte is completely filled in the residual space in the battery without liquid injection, so that the purpose of measuring and calculating the residual space in the lithium battery without liquid injection is achieved, the efficiency is high, and the effect is good.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a flow chart of the method of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention.
As shown in fig. 1, the device for verifying the internal space of the lithium battery in the embodiment includes an electrolyte container 9, the electrolyte container 9 is disposed above a battery 10 to be tested, a liquid outlet of the electrolyte container 9 is connected to a liquid inlet of the battery 10, and the electrolyte container 9 and the battery 10 are disposed in a sealed cavity; the electrolyte container 9 is fixed in the sealed cover body 2 through a setting bracket 8.
The vacuum pump further comprises a vacuum pumping valve 7, wherein the vacuum pumping valve 7 is arranged outside the sealed cavity, the vacuum pumping valve 7 is communicated with the sealed cavity, and the vacuum pumping valve 7 is further connected with an external vacuum device;
the pressure valve 4 is arranged outside the sealed cavity, the pressure valve 4 is communicated with the sealed cavity, and the pressure valve 4 is connected with external compressed gas;
still include vacuum meter 3, vacuum meter 3 sets up in seal chamber's outside, and vacuum meter 3 communicates with seal chamber.
The sealing cavity comprises a sealing cover body 2 and a sealing cover 6, the sealing cover 6 is arranged above the sealing cover body 2, and a sealing gasket 5 is arranged between the sealing cover 6 and the sealing cover body 2. The sealing cover 6 is provided with a buckle which is matched with the sealing cover body 2 for use.
Still include base 1, battery 10 and sealed cavity are fixed respectively on base 1, base 1 and the integrated into one piece of sealed cover body 2.
Wherein, the supporting base 1 plays a role in fixing the sealing cover body 2 and the whole device;
the vacuum meter 3 is connected with the sealing cover body 2 and displays the internal air pressure of the whole device after sealing; a pressure valve 4 and
the external compressed gas is connected to pressurize the sealed device;
the sealing gasket 5 and the sealing cover 6 seal the device;
the vacuumizing valve 7 is connected with an external vacuum device, and vacuumizing and releasing positive pressure are carried out on the sealed device;
the electrolyte container 8 bracket plays a role in supporting and fixing the electrolyte container 9, so that the electrolyte container can be matched and fixed with the battery injection port;
the support base 1 may be designed integrally with the sealing cap 2.
The pressurizing valve 4, the vacuum-pumping valve 7 and the vacuum gauge 3 are arranged on the sealed cover body 2.
The sealing gasket 5 plays a role in sealing the cover body 2 and the sealing cover 6.
The sealing cover 6 is provided with a buckle which is matched with the sealing cover body 2 for use, so that the whole device is convenient to seal.
The electrolyte container bracket 8 is fixedly arranged on the sealing cover body 2.
As shown in fig. 2, the present embodiment further discloses a method for verifying an internal space of a lithium battery, where the device for verifying an internal space of a lithium battery includes the following steps:
s100, placing the battery 10 to be tested into the sealed cover body 2,
s200, arranging a liquid outlet of the electrolyte container 9 and a liquid injection port of the battery 10 to be tested in a matched mode;
s300, quantitatively injecting electrolyte exceeding theoretical calculation into the electrolyte container 9;
s400, sealing the sealing cover 6, the sealing cover body 2 and the sealing gasket 5;
s500, vacuumizing the whole sealing device through a vacuumizing valve 7 and keeping for a certain time;
s600, filling dry gas into the vacuumized device through a pressurizing valve 4, breaking vacuum and pressurizing, so that the electrolyte in an electrolyte container 9 is injected into the battery 10 to be tested;
s700, performing a plurality of times of circulating operation on the steps S500 and S600 to ensure that the residual space inside the battery 10 to be tested is completely filled with electrolyte;
s800, finishing the vacuumizing and pressurizing circulation operation, determining the residual electrolyte in the electrolyte container 9, and calculating the internal space of the battery without liquid injection by combining the total amount of the electrolyte injected into the initial electrolyte container 9;
wherein, the calculation formula is: internal space V ═ of unliquefied battery (initial electrolyte amount m)1Residual electrolytic quantity m2) The electrolyte density ρ.
To sum up, in the embodiment of the present invention, the electrolyte amount exceeding the theoretical calculation is injected into the electrolyte container 9, the entire device is sealed, the entire device is vacuumized, maintained for a certain time, then vacuum breaking is performed, pressurization is performed, the electrolyte in the electrolyte container is injected into the battery 10, several times of circulation operations are performed on the vacuumization and the positive pressure, so that the remaining space inside the battery 10 is completely filled with the electrolyte, and then the internal space of the battery which is not filled with the electrolyte is obtained through conversion. According to the embodiment of the invention, negative pressure and positive pressure are alternately carried out, and the air in the battery which is not injected with liquid is replaced by the electrolyte of the lithium battery, so that the residual space in the battery which is not injected with liquid is completely filled with the electrolyte, and the purpose of measuring and calculating the residual space in the lithium battery which is not injected with liquid is further achieved, and the efficiency is high and the effect is good.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (6)
1. The utility model provides a lithium cell inner space verification method, is based on lithium cell inner space verification device, the device includes electrolyte container (9), and electrolyte container (9) set up in the top of awaiting measuring battery (10), the liquid outlet of electrolyte container (9) is connected with the notes liquid mouth of awaiting measuring battery (10), its characterized in that: the electrolyte container (9) and the battery (10) to be tested are arranged in the sealed cavity;
the vacuum pump further comprises a vacuum pumping valve (7), the vacuum pumping valve (7) is arranged outside the sealed cavity, the vacuum pumping valve (7) is communicated with the sealed cavity, and the vacuum pumping valve (7) is further connected with an external vacuum device;
the pressure valve (4) is arranged outside the sealed cavity, the pressure valve (4) is communicated with the sealed cavity, and the pressure valve (4) is connected with external compressed gas;
the vacuum meter (3) is arranged outside the sealed cavity, and the vacuum meter (3) is communicated with the sealed cavity;
the sealing cavity comprises a sealing cover body (2) and a sealing cover (6), and the sealing cover (6) is arranged above the sealing cover body (2);
the method for verifying the internal space of the lithium battery comprises the following steps:
s100, placing a battery (10) to be tested into a sealed cover body (2);
s200, arranging a liquid outlet of the electrolyte container (9) and a liquid injection port of the battery (10) to be tested in a matched manner;
s300, quantitatively injecting electrolyte into the electrolyte container (9);
s400, placing the sealing cover (6) on the sealing cover body (2) and carrying out sealing treatment;
s500, vacuumizing the sealed cavity through a vacuumizing valve (7) and keeping the sealed cavity for a set time;
s600, filling dry gas into the vacuumized sealed cavity through a pressurizing valve (4), breaking vacuum and pressurizing, so that the electrolyte in the electrolyte container (9) is injected into the battery (10) to be tested;
s700, repeating the steps S500 and S600 in sequence to enable the residual space inside the battery (10) to be tested to be completely filled with electrolyte;
s800, finishing the circulation operation of vacuumizing and pressurizing, determining the residual electrolyte in the electrolyte container (9), and calculating the internal space of the battery without liquid injection by combining the total amount of the electrolyte injected into the initial electrolyte container (9);
the calculation formula for calculating the internal space of the battery without liquid injection in step S800 is as follows: internal space V ═ of unliquefied battery (initial electrolyte amount m)1Residual electrolytic quantity m2) The electrolyte density ρ.
2. The lithium battery internal space verification method according to claim 1, characterized in that: and a sealing gasket (5) is arranged between the sealing cover (6) and the sealing cover body (2).
3. The lithium battery internal space verification method according to claim 2, characterized in that: the sealing cover (6) is provided with a buckle which is matched with the sealing cover body (2) for use.
4. The lithium battery internal space verification method according to claim 2, characterized in that: the electrolyte container (9) is fixed in the sealed cover body (2) through a support (8).
5. The lithium battery internal space verification method according to claim 2, characterized in that: still include base (1), battery (10) and seal chamber are fixed respectively on base (1).
6. The lithium battery internal space verification method according to claim 5, characterized in that: the base (1) and the sealing cover body (2) are integrally formed.
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| CN201910202470.9A CN109962305B (en) | 2019-03-11 | 2019-03-11 | Lithium battery internal space verification method |
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| CN111653722A (en) * | 2020-05-15 | 2020-09-11 | 捷威动力工业嘉兴有限公司 | Efficient liquid injection method and device for soft package battery |
| CN114221046B (en) * | 2021-11-16 | 2023-08-25 | 天津力神电池股份有限公司 | Method for testing residual space volume in hard shell lithium ion battery |
| CN115184824B (en) * | 2022-09-14 | 2022-12-27 | 江苏时代新能源科技有限公司 | System, method and device for measuring residual space in battery |
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| CN100395904C (en) * | 2004-06-01 | 2008-06-18 | 肇庆市风华锂电池有限公司 | Process and device for cell pole piece pressurization and injection |
| CN202585610U (en) * | 2012-05-12 | 2012-12-05 | 深圳市信宇人科技有限公司 | Rapid adsorption vacuum liquid injection machine |
| CN106092245A (en) * | 2016-08-17 | 2016-11-09 | 合肥国轩高科动力能源有限公司 | A kind of tester for detecting inside lithium ion cell spatial volume and method of testing thereof |
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