CN112018449A - Manufacturing method and hot-pressing device for lithium battery soft package battery cell - Google Patents
Manufacturing method and hot-pressing device for lithium battery soft package battery cell Download PDFInfo
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- CN112018449A CN112018449A CN202010814356.4A CN202010814356A CN112018449A CN 112018449 A CN112018449 A CN 112018449A CN 202010814356 A CN202010814356 A CN 202010814356A CN 112018449 A CN112018449 A CN 112018449A
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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
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
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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
- H01M10/44—Methods for charging or discharging
- H01M10/446—Initial charging measures
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
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Abstract
The invention discloses a manufacturing method and a hot pressing device of a lithium battery soft package battery cell, wherein the manufacturing method of the lithium battery soft package battery cell comprises the following steps in sequence: vacuum sealing, pre-charging and insulation testing. The vacuum sealing step is to carry out vacuum sealing on the battery cell soaked by the injection liquid; the pre-charging step is to pre-charge the battery cell after vacuum sealing; and the insulation test step is to perform insulation test on the pre-charged battery core. The manufacturing method of the soft package battery cell of the lithium battery can improve the infiltration effect and the safety of the battery cell, promote the negative electrode of the battery cell to form an SEI film in advance, shorten the time for subsequent formation and infiltration of the battery cell and improve the detection rate of poor insulation of the battery cell.
Description
Technical Field
The invention relates to the technical field of lithium battery manufacturing, in particular to a manufacturing method and a hot-pressing device of a lithium battery soft package battery core.
Background
Lithium batteries (Lithium batteries) refer to batteries in which the electrochemical system contains Lithium (including metallic Lithium, Lithium alloys and Lithium ions, Lithium polymers). The lithium ion battery has the advantages of high energy density, long cycle life, low self-discharge rate and the like, and the lithium ion battery industry is rapidly developed in recent years along with the increasing demands of the power field and the energy storage field. According to the shape of lithium batteries, they can be roughly classified into three categories: cylinders, square shells, flexible packages; the soft package lithium battery has obvious advantages in energy density, and the single battery cell is developed in the direction of high capacity and high multiplying power at present, so that the requirements of the fields of new energy automobiles and the like on the mobile power supply are met.
With the increasing demand of the flexible package lithium battery, the requirement on the single flexible package lithium battery is higher; after the lithium battery is injected with liquid, the quality of the infiltration effect of the electrolyte in the battery core determines the formation quality of the SEI film. If the battery cell infiltration effect is not good, the problem of poor battery cell capacity can be caused. After the electric core is subjected to vacuum heat sealing, insulation detection needs to be carried out between the electric core negative electrode lug and the aluminum layer of the electric core aluminum-plastic film, and the electric core insulation state is detected. If the cell insulation is poor, the problems of cell flatulence, liquid leakage and the like can be caused.
The existing manufacturing method of the soft package battery core of the lithium battery mainly comprises the steps of battery core liquid injection, normal-pressure infiltration, vacuum sealing, insulation test, normal-temperature infiltration, high-temperature infiltration, pre-charging, Degas and the like which are sequentially carried out, wherein two problems mainly exist:
firstly, after the battery core is injected with liquid, the electrolyte is soaked in the battery core by adopting a vacuum standing mode, but the actual soaking effect of the electrolyte in the battery core is poor.
Secondly, testing the insulation of the battery cell after vacuum heat sealing, wherein the testing principle is that a positive connecting wire and a negative connecting wire of an insulation tester are respectively connected with an aluminum layer of the battery cell aluminum-plastic film and a battery cell negative electrode lug, high voltage of more than 100V is instantly output to the battery cell, and the resistance value from the battery cell negative electrode lug to the aluminum layer of the battery cell aluminum-plastic film is detected; however, due to the fact that the generated potential difference is short in time, the problem of missing judgment exists, the electric core with poor insulation cannot be effectively detected, and the electric core with poor insulation flows into a lower process or even a client.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, an object of the present invention is to provide a method for manufacturing a soft-packaged battery cell of a lithium battery, which can improve the wetting effect and safety of the battery cell, promote the negative electrode of the battery cell to form an SEI film in advance, shorten the time for subsequent formation and wetting of the battery cell, and improve the detection rate of poor insulation of the battery cell.
According to the embodiment of the first aspect of the invention, the method for manufacturing the soft package battery core of the lithium battery comprises the following steps in sequence:
vacuum sealing, wherein the vacuum sealing step is to carry out vacuum sealing on the battery cell soaked by the injection liquid;
pre-charging, wherein the pre-charging step is to pre-charge the battery cell after vacuum sealing;
and performing insulation test, wherein the insulation test step is to perform insulation test on the pre-charged battery core.
According to the manufacturing method of the soft package battery cell of the lithium battery in the embodiment of the first aspect of the invention, the vacuum sealing step is to carry out vacuum sealing on the battery cell after liquid injection and infiltration, so that on one hand, electrolyte leakage can be prevented, gaps in the battery cell can be reduced, the vacuum degree in the battery cell is improved, the electrolyte is uniformly distributed in the battery cell, and the infiltration effect of the electrolyte in the battery cell is improved; on the other hand, oxygen can be prevented from entering the interior of the battery cell to react with active substances, the risk of gas generation bulge and explosion of the battery cell is reduced, and the safety of the battery cell is improved. The pre-charging step is to pre-charge the battery cell after vacuum sealing, so that on one hand, a potential difference can be formed between the positive electrode and the negative electrode of the battery cell, ion conduction is facilitated, and the battery cell with poor insulation can be effectively screened out in the subsequent insulation testing step; on the other hand, the negative electrode of the battery cell can be promoted to form an SEI film in advance, so that the time for subsequent formation and infiltration of the battery cell is shortened; in addition, after the pre-charging, the internal resistance data of the battery cell can be obtained through the voltage and current data output by the pre-charging instrument, so that more favorable data can be provided for the subsequent formation analysis of the self-discharge of the battery cell and the DCIR data. The insulation test step is to perform insulation test on the pre-charged battery core, and the pre-charged battery core forms a potential difference between the positive electrode and the negative electrode, so that the insulation test is performed on the pre-charged battery core, the battery core with poor insulation can be effectively screened out, and the detection rate of the poor insulation of the battery core is improved.
According to an embodiment of the first aspect of the present invention, the pre-charging step is performed by first constant-current charging and then constant-voltage charging.
According to a further embodiment of the first aspect of the present invention, the constant current charging specifically is to perform constant current charging on the vacuum-sealed battery cell by using a 0.3C constant current, and charge the battery cell to 3.85V; the constant-voltage charging is specifically that the constant-voltage charging is carried out on the battery cell after the constant-current charging by adopting a 3.85V constant voltage, and the battery cell is charged to 0.01C.
According to still further embodiments of the first aspect of the present invention, after the pre-charging step is completed, an SEI film is formed on the pre-charged negative electrode of the battery cell.
According to some embodiments of the first aspect of the present invention, in the insulation testing step, an insulation tester is used to perform insulation detection on the pre-charged battery cell, and positive and negative connection lines of the insulation tester are respectively connected to the aluminum layer of the pre-charged battery cell aluminum-plastic film and the battery cell negative electrode tab.
According to an embodiment of the first aspect of the present invention, before the vacuum sealing step, the method further comprises the steps of:
injecting liquid into the battery cell, wherein the step of injecting the liquid into the battery cell is to inject the liquid into the battery cell;
and hot-pressing infiltration, wherein the hot-pressing infiltration step is positioned between the battery core liquid injection step and the vacuum sealing step, and the hot-pressing infiltration step is to perform vacuum hot-pressing infiltration on the battery core after liquid injection.
According to some embodiments of the first aspect of the present invention, in the step of hot-pressing infiltration, the electric core is hot-pressed by using a hot-pressing device, where the hot-pressing device includes two hot-pressing plates, and the two hot-pressing plates respectively contact two sides of the electric core to hot-press the electric core.
The invention also provides a hot-pressing device in a second aspect.
The hot-pressing device according to the embodiment of the second aspect of the present invention includes two hot-pressing plates, where the two hot-pressing plates are respectively in contact with two side surfaces of the battery cell after the battery cell is subjected to liquid injection and before the vacuum sealing, so as to perform hot-pressing on the battery cell after the battery cell liquid injection step and before the vacuum sealing step, so as to perform vacuum hot-pressing infiltration.
According to the hot-pressing device of the embodiment of the second aspect of the invention, the two hot-pressing plates are respectively contacted with the two side surfaces of the battery cell after the battery cell is injected with liquid and before the vacuum sealing, so that the battery cell after the battery cell injection step and before the vacuum sealing step is hot-pressed to perform vacuum hot-pressing infiltration; therefore, on one hand, certain uniform pressure can be applied to two side surfaces of the battery cell through the two hot pressing plates, so that gas in the battery cell can be discharged, gaps in the battery cell are reduced, and the battery cell is compacted; on the other hand, two side surfaces of the battery cell can be uniformly heated through the two hot pressing plates, so that the internal temperature of the battery cell is uniform; therefore, after the step of injecting liquid into the battery cell through the hot pressing device and before the step of vacuum sealing, the battery cell is hot-pressed to carry out vacuum hot-pressing infiltration, so that the infiltration effect of the electrolyte in the battery cell can be effectively improved, and the infiltration time of subsequent formation can be favorably shortened.
According to an embodiment of the second aspect of the present invention, the inner side surfaces of the two hot press plates are respectively provided with a silicone member.
According to an embodiment of the second aspect of the present invention, the battery further comprises a cell support member for supporting the cell.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram of a hot press apparatus according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a cell support according to an embodiment of the present invention.
Reference numerals:
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
The method for manufacturing the soft package cell of the lithium battery according to the embodiment of the first aspect of the invention is described in detail below.
According to the embodiment of the first aspect of the invention, the method for manufacturing the soft package battery core of the lithium battery comprises the following steps in sequence: vacuum sealing, pre-charging and insulation testing. The vacuum sealing step is to carry out vacuum sealing on the battery cell soaked by the injection liquid; the pre-charging step is to pre-charge the battery cell after vacuum sealing; and the insulation test step is to perform insulation test on the pre-charged battery core.
According to the manufacturing method of the soft package battery cell of the lithium battery in the embodiment of the first aspect of the invention, the vacuum sealing step is to carry out vacuum sealing on the battery cell after liquid injection and infiltration, so that on one hand, electrolyte leakage can be prevented, gaps in the battery cell can be reduced, the vacuum degree in the battery cell is improved, the electrolyte is uniformly distributed in the battery cell, and the infiltration effect of the electrolyte in the battery cell is improved; on the other hand, oxygen can be prevented from entering the interior of the battery cell to react with active substances, the risk of gas generation bulge and explosion of the battery cell is reduced, and the safety of the battery cell is improved. The pre-charging step is to pre-charge the battery cell after vacuum sealing, so that on one hand, a potential difference can be formed between the positive electrode and the negative electrode of the battery cell, ion conduction is facilitated, and the battery cell with poor insulation can be effectively screened out in the subsequent insulation testing step; on the other hand, the negative electrode of the battery cell can be promoted to form an SEI film in advance, so that the time for subsequent formation and infiltration of the battery cell is shortened; in addition, after the pre-charging, the internal resistance data of the battery cell can be obtained through the voltage and current data output by the pre-charging instrument, so that more favorable data can be provided for the subsequent formation analysis of the self-discharge of the battery cell and the DCIR data. The insulation test step is to perform insulation test on the pre-charged battery core, and the pre-charged battery core forms a potential difference between the positive electrode and the negative electrode, so that the insulation test is performed on the pre-charged battery core, the battery core with poor insulation can be effectively screened out, and the detection rate of the poor insulation of the battery core is improved.
According to an embodiment of the first aspect of the present invention, the pre-charging step is performed by first constant-current charging and then constant-voltage charging. It can be understood that constant current charging is performed firstly, relatively large current can be adopted, the charging efficiency is high, and the constant current charging is changed into constant voltage charging after the constant current charging is stopped for a certain time, so that the virtual voltage rise caused by the polarization internal resistance of the battery cell is avoided; and the constant-current charging is changed into the constant-voltage charging after the constant-current charging, so that the charging current can be reduced, a relatively stable potential difference is formed between the positive electrode and the negative electrode of the battery cell, and the battery cell is prevented from being damaged by overcharging.
According to a further embodiment of the first aspect of the present invention, the constant current charging is specifically that a 0.3C constant current power supply is adopted to perform constant current charging on the vacuum-sealed battery cell, and the charging is performed to 3.85V; the constant-voltage charging is specifically that a 3.85V constant-voltage power supply is adopted to perform constant-voltage charging on the battery cell after constant-current charging, and the battery cell is charged to 0.01C. Therefore, the charging efficiency is high, the damage to the battery cell is small, and a stable potential difference can be formed between the positive electrode and the negative electrode of the battery cell.
According to a still further embodiment of the first aspect of the present invention, after the pre-charging step is completed, an SEI film is formed on the pre-charged negative electrode of the battery cell. Specifically, the reaction formula is as follows:
PC+2e-+2Li+→CH3CH(OCO2Li)↓+CH3CH＝CH2↑
2EC+2e-+2Li+→(CH2OCO2Li)2↓+CH2＝CH2↑
it can be understood that the SEI film is Li+The good conductor can transmit lithium ions in the cathode, and the lithium ions enter the surface of the cathode to carry out lithium extraction and insertion work, and is good in electron insulationThe reason body can reduce the inside short circuit probability of electric core effectively, improves electric core self discharge risk, and in addition, the SEI membrane can prevent effectively that solvent molecule from imbedding altogether, avoids the negative pole to produce the damage, improves the cyclicity ability and the life of electric core, shortens follow-up electric core and becomes the time of infiltrating.
According to some embodiments of the first aspect of the present invention, in the insulation testing step, an insulation tester is used to perform insulation detection on the pre-charged battery cell, and a positive connection line and a negative connection line of the insulation tester are respectively connected to the aluminum layer of the pre-charged battery cell aluminum-plastic film and the battery cell negative electrode tab. It can be understood that after the cell is precharged, a stable potential difference is formed between the positive electrode lug and the negative electrode lug of the cell; poor insulation is the short circuit between the battery cell tab and the battery cell shell (aluminum layer of the aluminum-plastic film); poor insulation can be divided into electron conduction and ion conduction; the electronic conduction is caused by the direct contact of the lug of the physical battery cell and the aluminum layer of the aluminum-plastic film of the battery cell; the ion conduction is the conduction of the cell cathode lug and the aluminum layer of the cell aluminum-plastic film indirectly caused by electrolyte in the cell; when a stable potential difference exists between the positive electrode lug and the negative electrode lug of the battery cell, if poor insulation occurs, for example, a pp layer in the aluminum-plastic film is damaged, the negative electrode lug and/or the negative electrode piece of the battery cell is directly contacted with an aluminum layer of the aluminum-plastic film of the battery cell, or the negative electrode lug and/or the negative electrode piece of the battery cell is indirectly communicated with the aluminum layer of the aluminum-plastic film through electrolyte, the stable potential difference is formed between the negative electrode lug of the battery cell and the aluminum layer of the aluminum-plastic film of the battery cell; therefore, the insulation tester is used for carrying out insulation detection on the pre-charged battery cell, and the positive connecting wire and the negative connecting wire of the insulation tester are respectively connected with the aluminum layer of the pre-charged battery cell aluminum-plastic film and the battery cell negative electrode lug, so that the battery cell with poor insulation can be screened out. In addition, it should be noted that the insulation tester may be, but is not limited to, a HI-POT tester.
A comparative test was conducted on the insulation test method of the first embodiment of the present invention and a conventional insulation test method as follows:
dividing 40 sample cells into A, B groups, wherein each group comprises 20 sample cells; before the aluminum plastic film of the sample cell is thermally sealed, manually destroying the pp layer in the aluminum plastic film to expose the aluminum layer of the aluminum plastic film so as to be contacted with the electrolyte; and carrying out the working procedures of aluminum plastic film heat sealing, liquid injection infiltration, vacuum sealing and the like on the sample cell.
After the 20 sample battery cells in the group A are sealed in a vacuum mode, a traditional insulation test method is adopted, positive connecting wires and negative connecting wires of an insulation tester are respectively connected to an aluminum layer of an aluminum plastic film of the sample battery cells and a negative electrode lug of the sample battery cells, the insulation test parameters are voltage 100V, the insulation resistance standard is 200 MOmega, and the test time is 1 s;
after the 20 sample cells in the group B are vacuum-sealed, the insulation test method of the embodiment of the first aspect of the invention is adopted, the sample cells are pre-charged, and then the insulation test is carried out; the pre-charging parameter is that the charging is carried out by adopting a 0.3C constant current CC until the charging is 3.85V; then charging to 0.01C by using a 3.85V constant voltage; and respectively connecting a positive connecting wire and a negative connecting wire of an insulation tester to an aluminum layer of the pre-charged sample cell aluminum-plastic film and a sample cell negative electrode lug, wherein insulation test parameters are the same as those of the group A, the voltage is 100V, the insulation resistance standard is 200 MOmega, and the test time is 1 s.
The test data are as follows:
the test summary is as follows:
in the group A data, 20 insulation failure sample cells are detected, 18 NG (insulation failure) cells are detected in total, and the other 2 NG cells are judged as OK cells by mistake; the detection rate of poor insulation is 90%;
in the group B data, 20 insulation failure sample cells are detected, and 20 NG (insulation failure) cells are detected in total without misjudgment; the detection rate of poor insulation is 100%;
in summary, the electric core after the vacuum sealing is precharged before the insulation test, so that the poor insulation detection rate of the electric core can be effectively improved.
According to an embodiment of the first aspect of the present invention, before the vacuum sealing step, the method further comprises the steps of:
injecting liquid into the battery cell, wherein the step of injecting liquid into the battery cell is to inject liquid into the battery cell; it can be understood that, by injecting liquid into the battery cell, the electrode group formed by the positive and negative electrode plates and the diaphragm of the battery cell can be soaked in the electrolyte, which is beneficial to forming an ion channel, thereby ensuring that enough lithium ions can migrate between the positive and negative electrode plates in the charging and discharging process of the battery cell, and realizing reversible circulation.
And hot-pressing infiltration, wherein the hot-pressing infiltration step is positioned between the battery cell liquid injection step and the vacuum sealing step, and the hot-pressing infiltration step is to perform vacuum hot-pressing infiltration on the battery cell after liquid injection. It should be noted that, by performing vacuum hot-pressing infiltration on the battery cell after liquid injection before the vacuum sealing step, the infiltration effect of the electrolyte inside the battery cell can be effectively improved, and the subsequent formation infiltration time can be favorably shortened.
According to some embodiments of the first aspect of the present invention, in the hot pressing infiltration step, the cell is hot pressed by using a hot pressing apparatus 1, as shown in fig. 1 and fig. 2, the hot pressing apparatus 1 includes two hot pressing plates 11, and the two hot pressing plates 11 respectively contact two sides of the cell to hot press the cell. Therefore, on one hand, certain uniform pressure can be applied to two side surfaces of the battery cell through the two hot pressing plates 11, so that gas in the battery cell can be discharged, gaps in the battery cell can be reduced, the battery cell can be compacted, and the vacuum degree in the battery cell can be improved; on the other hand, two side surfaces of the battery cell can be uniformly heated through the two hot pressing plates 11, so that the internal temperature of the battery cell is uniform; therefore, the cell is hot-pressed by the hot-pressing device 1, so that the infiltration effect of the electrolyte in the cell can be effectively improved, and the infiltration time of subsequent formation can be favorably shortened.
Preferably, the inner side surfaces of the two hot press plates 11 are respectively provided with a silica gel piece. It can be understood that, because the inner side surfaces of the two hot pressing plates 11 are respectively provided with the silica gel part, the inner side surfaces of the two hot pressing plates 11 are in flexible contact with the two side surfaces of the battery cell, and the damage to the two side surfaces of the battery cell is effectively avoided.
Preferably, the hot-pressing device 1 further includes a cell support member 12, and the cell support member 12 is used for supporting the cell. Specifically, the cell support member 12 includes a bottom support portion 121 and two vertical support portions 122, the lower ends of the two vertical support portions 122 are respectively fixedly connected with the two ends of the bottom support portion 121, thereby forming a U-shaped frame, wherein the two vertical support portions 122 are respectively provided with a U-shaped groove 123 with an upward opening, thus, the bottom end of the cell is supported on the bottom support portion 121, the two end tabs of the cell are respectively located in the two corresponding U-shaped grooves 123 to support and limit the two tabs through the two vertical support portions 122, thereby enabling the cell to be placed on side more stably, and facilitating hot pressing of the cell through two side surfaces of the two hot pressing plates 11 contacting the cell.
Preferably, the contact part between the inner side of the cell support plate 12 and the cell is made of a silica gel material, so that the cell is prevented from being damaged.
Preferably, an air cylinder or a servo motor may be used to control the movement of the hot press plate 11, so as to precisely control and adjust the position of the hot press plate 11 and the pressure applied by the hot press plate 11 to the battery cell.
Preferably, the pressure applied to the battery cell by the hot pressing plate 11 is 0.3-0.5 MPa, and at the moment, the hot pressing plate 11 can effectively compact the battery cell and can avoid electrolyte overflow caused by overlarge pressure.
Preferably, the temperature of the hot-pressing plate 11 does not exceed 70 ℃, because too high temperature can cause the nylon layer on the outer surface of the aluminum-plastic film of the battery cell to be damaged; on the other hand, decomposition of the electrolyte may be caused.
Preferably, the temperature of the hot pressing plate 11 is 50-60 ℃, and the temperature of the hot pressing plate 11 can be effectively conducted into the battery cell, so that the diffusion and infiltration of electrolyte inside the battery cell are accelerated.
Preferably, set up heating pipe 13 in the hot pressboard 11, like this, can provide heat heating hot pressboard 11 through heating pipe 13, rethread hot pressboard 11 is inboard heats electric core, has improved the security of heating, has avoided the too much loss of heat.
Preferably, a single hot pressing plate 11 internally mounted has 3 ~ 4 heating pipes 13, and the power of heating pipe 13 is 300 ~ 500W, can guarantee like this that heating pipe 13 evenly heats hot pressing plate 11 to the realization is to the even heating of electric core.
Preferably, the insulation testing step further comprises the steps of normal temperature infiltration, high temperature infiltration, secondary pre-charging, Degas and the like which are sequentially carried out.
The second aspect of the invention also provides a hot-pressing device 1.
A hot press apparatus 1 according to an embodiment of the second aspect of the present invention will be described in detail with reference to fig. 1 and 2.
As shown in fig. 1 and fig. 2, the hot pressing apparatus 1 according to the embodiment of the second aspect of the present invention includes two hot pressing plates 11, where the two hot pressing plates 11 are respectively in contact with two side surfaces of the battery cell after the battery cell is injected with liquid and before the vacuum sealing step, so as to hot press the battery cell after the battery cell injection step and before the vacuum sealing step, so as to perform vacuum hot pressing infiltration.
According to the hot-pressing device 1 of the embodiment of the second aspect of the present invention, since the two hot-pressing plates 11 are respectively in contact with the two side surfaces of the battery cell after the battery cell liquid injection and before the vacuum sealing, the battery cell after the battery cell liquid injection step and before the vacuum sealing step is hot-pressed to perform the vacuum hot-pressing infiltration; therefore, on one hand, a certain uniform pressure can be applied to two side surfaces of the battery cell through the two hot pressing plates 11, so that gas in the battery cell can be discharged, gaps in the battery cell can be reduced, the battery cell can be compacted, and the vacuum degree in the battery cell can be improved; on the other hand, two side surfaces of the battery cell can be uniformly heated through the two hot pressing plates 11, so that the internal temperature of the battery cell is uniform; therefore, after the step of injecting liquid into the battery cell and before the step of vacuum sealing, the hot pressing device 1 is used for hot pressing the battery cell to perform vacuum hot pressing infiltration, so that the infiltration effect of the electrolyte in the battery cell can be effectively improved, and the infiltration time of subsequent formation can be favorably shortened.
According to an embodiment of the second aspect of the present invention, the two hot press plates 11 are provided with silicone members on their inner side surfaces, respectively. It can be understood that, because the inner side surfaces of the two hot pressing plates 11 are respectively provided with the silica gel part, the inner side surfaces of the two hot pressing plates 11 are in flexible contact with the two side surfaces of the battery cell, and the damage to the two side surfaces of the battery cell is effectively avoided.
According to an embodiment of the second aspect of the present invention, the battery cell support device further comprises a cell support member 12, and the cell support member 12 is used for supporting the battery cell. Specifically, the cell support member 12 includes a bottom support portion 121 and two vertical support portions 122, the lower ends of the two vertical support portions 122 are respectively fixedly connected with the two ends of the bottom support portion 121, thereby forming a U-shaped frame, wherein the two vertical support portions 122 are respectively provided with a U-shaped groove 123 with an upward opening, thus, the bottom end of the cell is supported on the bottom support portion 121, the two end tabs of the cell are respectively located in the two corresponding U-shaped grooves 123 to support and limit the two tabs through the two vertical support portions 122, thereby enabling the cell to be placed on side more stably, and facilitating hot pressing of the cell through two side surfaces of the two hot pressing plates 11 contacting the cell.
Preferably, the contact part between the inner side of the cell support plate 12 and the cell is made of a silica gel material, so that the cell is prevented from being damaged.
Preferably, an air cylinder or a servo motor may be used to control the movement of the hot press plate 11, so as to precisely control and adjust the position of the hot press plate 11 and the pressure applied by the hot press plate 11 to the battery cell.
Preferably, the pressure applied to the battery cell by the hot pressing plate 11 is 0.3-0.5 MPa, and at the moment, the hot pressing plate 11 can effectively compact the battery cell and can avoid electrolyte overflow caused by overlarge pressure.
Preferably, the temperature of the hot-pressing plate 11 does not exceed 70 ℃, because too high temperature can cause the nylon layer on the outer surface of the aluminum-plastic film of the battery cell to be damaged; on the other hand, decomposition of the electrolyte may be caused.
Preferably, the temperature of the hot pressing plate 11 is 50-60 ℃, and the temperature of the hot pressing plate 11 can be effectively conducted into the battery cell, so that the diffusion and infiltration of electrolyte inside the battery cell are accelerated.
Preferably, be provided with heating pipe 13 in the hot pressboard 11, like this, can provide heat heating hot pressboard 11 through heating pipe 13, rethread hot pressboard 11 is inboard heats electric core, has improved the security of heating, has avoided the too much loss of heat.
Preferably, a single hot pressing plate 11 internally mounted has 3 ~ 4 heating pipes 13, and the power of heating pipe 13 is 300 ~ 500W, can guarantee like this that heating pipe 13 evenly heats hot pressing plate 11 to the realization is to the even heating of electric core.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like are intended to mean that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. The manufacturing method of the soft package battery core of the lithium battery is characterized by comprising the following steps of:
vacuum sealing, wherein the vacuum sealing step is to carry out vacuum sealing on the battery cell soaked by the injection liquid;
pre-charging, wherein the pre-charging step is to pre-charge the battery cell after vacuum sealing;
and performing insulation test, wherein the insulation test step is to perform insulation test on the pre-charged battery core.
2. The method for manufacturing the soft package battery cell of the lithium battery as claimed in claim 1, wherein the pre-charging step is performed by constant current charging and then constant voltage charging.
3. The manufacturing method of the soft package battery cell of the lithium battery as claimed in claim 2, wherein the constant current charging is specifically constant current charging of the vacuum-sealed battery cell to 3.85V by using a 0.3C constant current; the constant-voltage charging is specifically that the constant-voltage charging is carried out on the battery cell after the constant-current charging by adopting a 3.85V constant voltage, and the battery cell is charged to 0.01C.
4. The manufacturing method of the soft package battery cell of the lithium battery as claimed in claim 3, wherein after the pre-charging step is completed, the SEI film is formed on the pre-charged negative electrode of the battery cell.
5. The method for manufacturing the soft package battery cell of the lithium battery as claimed in any one of claims 1 to 4, wherein in the insulation test step, an insulation tester is used to perform insulation detection on the pre-charged battery cell, and the positive and negative connecting wires of the insulation tester are respectively connected with the aluminum layer of the pre-charged battery cell aluminum-plastic film and the negative electrode tab of the battery cell.
6. The method for manufacturing the lithium battery soft package core according to claim 1, further comprising the following steps before the vacuum sealing step:
injecting liquid into the battery cell, wherein the step of injecting the liquid into the battery cell is to inject the liquid into the battery cell;
and hot-pressing infiltration, wherein the hot-pressing infiltration step is positioned between the battery core liquid injection step and the vacuum sealing step, and the hot-pressing infiltration step is to perform vacuum hot-pressing infiltration on the battery core after liquid injection.
7. The method for manufacturing the soft package battery cell of the lithium battery of claim 5, wherein in the step of hot pressing and infiltrating, the battery cell is hot pressed by a hot pressing device, the hot pressing device comprises two hot pressing plates, and the two hot pressing plates are respectively contacted with two side surfaces of the battery cell to hot press the battery cell.
8. The utility model provides a hot press unit, its characterized in that includes two hot pressboards, two the hot pressboard respectively with the electric core annotate the liquid back and before the vacuum seal the both sides face contact of electric core to annotate the electric core liquid step back and before the vacuum seal step electric core hot pressing, in order to carry out vacuum hot pressing and soak.
9. The hot pressing device according to claim 8, wherein the inner side surfaces of the two hot pressing plates are respectively provided with a silica gel member.
10. The hot press apparatus of claim 8, further comprising a cell support member configured to support the cell.
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