CN113471547A - Preparation method of battery and battery - Google Patents
Preparation method of battery and battery Download PDFInfo
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- CN113471547A CN113471547A CN202110541166.4A CN202110541166A CN113471547A CN 113471547 A CN113471547 A CN 113471547A CN 202110541166 A CN202110541166 A CN 202110541166A CN 113471547 A CN113471547 A CN 113471547A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 239000003792 electrolyte Substances 0.000 claims abstract description 71
- 239000002390 adhesive tape Substances 0.000 claims abstract description 53
- 238000004804 winding Methods 0.000 claims abstract description 19
- 238000010438 heat treatment Methods 0.000 claims abstract description 17
- 238000004519 manufacturing process Methods 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims description 24
- -1 polypropylene Polymers 0.000 claims description 22
- 239000010410 layer Substances 0.000 claims description 18
- 239000000758 substrate Substances 0.000 claims description 14
- 239000011148 porous material Substances 0.000 claims description 13
- 239000012790 adhesive layer Substances 0.000 claims description 12
- 239000004743 Polypropylene Substances 0.000 claims description 8
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 8
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 8
- 229920001155 polypropylene Polymers 0.000 claims description 8
- 239000004642 Polyimide Substances 0.000 claims description 7
- 229920001721 polyimide Polymers 0.000 claims description 7
- 239000003522 acrylic cement Substances 0.000 claims description 5
- 239000002202 Polyethylene glycol Substances 0.000 claims 1
- 229920001223 polyethylene glycol Polymers 0.000 claims 1
- 239000013464 silicone adhesive Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 28
- 230000008595 infiltration Effects 0.000 abstract description 24
- 238000001764 infiltration Methods 0.000 abstract description 24
- 239000003292 glue Substances 0.000 abstract description 20
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 6
- 229910052744 lithium Inorganic materials 0.000 abstract description 6
- 238000004458 analytical method Methods 0.000 abstract description 2
- LYCAIKOWRPUZTN-UHFFFAOYSA-N ethylene glycol Natural products OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 13
- 239000007788 liquid Substances 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 10
- 238000002791 soaking Methods 0.000 description 10
- 238000012360 testing method Methods 0.000 description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 8
- 238000010521 absorption reaction Methods 0.000 description 8
- 239000000741 silica gel Substances 0.000 description 8
- 229910002027 silica gel Inorganic materials 0.000 description 8
- 239000000463 material Substances 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 4
- 239000002131 composite material Substances 0.000 description 4
- 238000003860 storage Methods 0.000 description 4
- 238000005303 weighing Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000009736 wetting Methods 0.000 description 2
- 239000004819 Drying adhesive Substances 0.000 description 1
- 239000004831 Hot glue Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 229920006332 epoxy adhesive Polymers 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000010416 ion conductor Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000007773 negative electrode material Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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Classifications
-
- 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
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
-
- 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
- H01M10/052—Li-accumulators
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Secondary Cells (AREA)
Abstract
The invention relates to the field of lithium batteries, in particular to a preparation method of a battery and the battery, wherein an adhesive tape is wound on a coiled battery core to fix the shape of the battery; then, the battery core is arranged in a battery shell, and electrolyte is injected; and then the battery is placed under a heating condition, and micropores for allowing electrolyte to enter the battery core are formed on the adhesive tape, so that the preparation of the battery is completed. This application is through with sticky tape winding back on electric core, recycles the heating condition of battery production, makes and is formed with the micropore on the sticky tape, and the electrolyte of pouring into in the battery this moment can enter into the battery through the micropore fast inside, has shortened the infiltration route and the infiltration time of electrolyte, has promoted the infiltration effect of electrolyte, reduces to analyse lithium, has effectively solved among the prior art because of the battery on the winding glue influence the technical problem that electrolyte soaks the effect.
Description
Technical Field
The invention relates to the field of lithium batteries, in particular to a preparation method of a battery and the battery.
Background
The electrolyte is an ion conductor which plays a role in conduction between the positive electrode and the negative electrode of the battery, and lithium ions are transmitted back and forth between the positive electrode and the negative electrode by the electrolyte in the charge-discharge process of the battery. The electrolyte is usually contacted with the pole piece in a soaking mode, and the electrolyte relates to the content of solid, liquid and gas three-phase contact. When the electrolyte is injected into the battery shell, the electrolyte firstly exhausts the air in the shell, then the electrolyte can be attached to the surfaces of the positive and negative active materials, and some electrolyte can enter between the positive electrode, the diaphragm and the negative electrode through the diaphragm of the winding core. The phenomenon that the pole piece is soaked by the electrolyte and the pole piece is soaked by the electrolyte in the diaphragm reversely can occur along with the time, and when the diaphragm is kept still for a certain time, the soaking of the electrolyte on the pole piece can reach a balanced state under the action of surface tension.
When the electrolyte has poor infiltration effect, the ion transmission path becomes far, so that the shuttle of lithium ions between the anode and the cathode is hindered, the pole piece which is not contacted with the electrolyte cannot participate in the electrochemical reaction, and meanwhile, the interface resistance of the battery is increased to influence the multiplying power performance, the discharge capacity, the service life and the like. Therefore, it is a very important step to improve the wetting effect of the electrolyte.
However, in the process of implementing the technical solution of the invention in the embodiments of the present application, the inventors of the present application find that the above-mentioned technology has at least the following technical problems: at present, the two end parts of most of the electric cores are wound by using single-sided hot melt adhesives, the winding area is large, and the electrolyte needs to be wound to an area without being pasted with the adhesives, so that the soaking path is lengthened, the soaking time needs to be prolonged, and finally the soaking effect of the electrolyte is poor.
In view of the above, it is necessary to provide a technical solution to the above problems.
Disclosure of Invention
One of the objectives of the present invention is to provide a method for preparing a battery, so as to solve the problem in the prior art that the infiltration effect of the electrolyte is deteriorated due to the winding of the glue on the two end portions of the battery cell, improve the infiltration effect of the electrolyte, and reduce the lithium deposition.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method of making a battery comprising the steps of:
the method comprises the following steps: winding an adhesive tape on the coiled battery cell to fix the shape of the battery cell;
step two: the battery core is arranged in a battery shell, and electrolyte is injected to obtain a battery;
step three: and (5) placing the battery after the step two under a heating condition, and forming micropores for allowing electrolyte to enter the battery core on the adhesive tape to finish the preparation of the battery.
The battery cell is wound to form a roll shape before electrolyte is injected, and in order to keep the shape of the battery cell fixed, the shape of the battery cell is generally fixed by adopting a tape winding mode. Due to the existence of the adhesive tape, after the electrolyte is injected into the battery cell, the electrolyte can be blocked by the adhesive tape, so that the electrolyte needs to bypass the adhesive tape for infiltration, and the infiltration path and the infiltration time of the electrolyte are prolonged. Based on this, this application utilizes the characteristics that need heat in battery production process, adopts specific sticky tape, and this sticky tape can produce the micropore under the heating condition that need reach in battery production process, utilizes inside this micropore power supply electrolyte gets into electric core for electrolyte need not to walk around the sticky tape, can soak the pole piece through the sticky tape from the micropore, has shortened the route and the time that electrolyte soaks, has promoted the infiltration effect of electrolyte, reduces and educes lithium. In addition, because the sticky tape is after the winding on electric core, just formed the micropore through the heating again, even when using the sticky tape to twine electric core, the sticky tape is not handled through the trompil, just the micropore that forms after the sticky tape winding is on electric core, when utilizing the sticky tape to twine electric core like this, the overall structure intensity of sticky tape does not receive the destruction, the quality of sticky tape also does not become light, when the sticky tape twines, the sticky tape is difficult for appearing the atress by tensile deformation or the condition of being difficult to stereotype, adopt the manufacturing method of this application can be more favorable to twining electric core.
Preferably, the heating temperature is 45-80 ℃, and the pore diameter of the micropores is 20-100 um. Under the temperature range, the temperature range can be reached in the production process of the battery, and when the temperature range is reached, micropores can be formed on the adhesive tape, so that the infiltration path of the electrolyte can be shortened, the infiltration time can be shortened, and the infiltration effect can be improved.
Meanwhile, the temperature required to be reached in different processing technologies of the battery is different, and correspondingly, the pore diameter of the micropores formed on the adhesive tape is also different. For example, in the process of testing the storage performance of the battery, according to the actual situation of the battery, the temperature is generally required to be heated to 45-60 ℃, and micropores of 20-50 um can be formed on the adhesive tape; or heating to 60-70 deg.C, at which time the adhesive tape can be formed into micropores of 50-70 um. In the formation process step of the battery, the heating condition of 70-80 ℃ is achieved, and micropores of 70-100 um can be formed on the adhesive tape.
Preferably, the heating temperature is 70-80 ℃, and the pore diameter of the micropores is 70-100 um. Because when the aperture of the micropore is larger, the electrolyte can more quickly enter the battery core pole piece through the micropore, and the soaking effect of the electrolyte is better. In the temperature range, micropores with larger apertures can be formed on the adhesive tape, so that the infiltration effect of the electrolyte can be further improved.
Preferably, the adhesive tape is bonded along two end faces of the battery cell. When the adhesive tape is used for winding the battery cell so as to fix the shape of the wound battery cell, the winding fixing effect on the battery cell can be improved by adopting a mode of winding the two end faces of the battery cell.
Preferably, in the second step, the micropores formed on the adhesive tape are uniformly distributed. The micropores distributed uniformly can enable the electrolyte to enter the battery core more uniformly in the soaking process, and the soaking effect is better. If the micropores formed on the adhesive tape are partially dense and partially sparse, the positions with relatively dense micropores are likely to enter more electrolyte, and the positions with relatively sparse micropores enter less electrolyte, which is likely to cause uneven distribution of electrolyte and affect the infiltration effect of electrolyte.
Preferably, in the second step, the porosity of the adhesive tape is 40-60%. If the porosity of the adhesive tape is less than 40%, the effect of improving the electrolyte to rapidly enter the battery core is not good. If the porosity of the adhesive tape is greater than 60%, although the effect of rapidly entering the battery cell by the electrolyte can be greatly improved, the winding and fixing effect of the adhesive tape on the battery cell can be affected due to too many gaps.
Preferably, the sticky tape includes the glue film and sets up substrate layer on the glue film, the glue film bonds on the electricity core, the micropore aperture by the substrate layer to the glue film grow gradually. When the battery cell is wound and fixed by using the adhesive tape, the adhesive layer of the adhesive tape is in contact with the surface of the battery cell, so that the adhesive tape is bonded and fixed with the battery cell. Therefore, when injecting electrolyte into the battery, electrolyte flows through the substrate layer earlier and flows through the glue film, and when the micropore aperture was by substrate layer to glue film grow gradually, can not only improve electrolyte and pass through micropore efficiency, can also play the liquid retaining effect to the electrolyte in the electricity core.
Preferably, the glue layer is at least one of acrylic glue and silica gel. The adhesive layer of the adhesive tape is mainly used for realizing the bonding and fixing between the adhesive tape and the battery cell, so that the adhesive layer can be acrylic adhesive, silica gel, epoxy adhesive, AB adhesive, quick-drying adhesive and the like. Acrylic glue and silica gel are preferably used because both acrylic glue and silica gel have superior high temperature resistance.
Preferably, the substrate layer is at least one of polypropylene, polyethylene terephthalate, ethylene glycol ester and polyimide. The base material is a material capable of forming micropores under the heating condition so as to achieve the effect of improving the wetting effect of the electrolyte. It may specifically be polypropylene, polyethylene terephthalate, ethylene glycol ester, polyimide, polyvinyl chloride, polycarbonate, polyethylene terephthalate, or the like. Polypropylene, polyethylene terephthalate, ethylene glycol, polyimide are preferably used because of their good stability at high temperatures.
The second objective of the present invention is to provide a battery, which is prepared by the above-mentioned method. The adhesive tape on the battery core can form micropores under the heating condition in the battery processing process, so that the infiltration effect of the electrolyte in the battery core can be improved, and the prepared battery has the advantages of high charge-discharge performance multiplying power, long cycle life, long storage time, wide temperature application range and the like.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
1. this application is through with sticky tape winding back on electric core, recycles the heating condition of battery production, makes and is formed with the micropore on the sticky tape, reinjects into electrolyte this moment, inside electrolyte can enter into electric core through the micropore fast, has shortened the infiltration route and the infiltration time of electrolyte, has promoted the infiltration effect of electrolyte, reduces to analyse lithium, has effectively solved among the prior art because of the electric core on the technical problem who influences electrolyte infiltration effect around gluing.
2. When using the sticky tape to twine electric core, the sticky tape is not handled through the trompil, and back on electric core is twined to the sticky tape, rethread heating makes the sticky tape produce the micropore, when utilizing the sticky tape to twine electric core like this, can guarantee that the overall structure intensity of sticky tape is not influenced, is favorable to twining electric core.
3. By using the heating process conditions of the battery, the adhesive tape can form corresponding different pore diameters in different temperature ranges.
Drawings
Fig. 1 is a schematic structural diagram of a battery cell in embodiment 1 of the present application.
Fig. 2 is a schematic view of the heated adhesive tape in example 1 of the present application.
Reference numerals: 1. an electric core; 2. an adhesive tape; 3. and (4) micro-pores.
Detailed Description
In order to make the technical solutions and advantages of the present application clearer, the present application and its advantages will be described in further detail below with reference to specific embodiments and drawings of the specification, but the embodiments of the present application are not limited thereto.
Example 1
A preparation method of a battery comprises the following specific steps:
the method comprises the following steps: and winding an adhesive tape 2 on the coiled battery core 1 to fix the shape of the battery core 1. Referring to fig. 1, in order to fix the wound shape of the battery cell 1 well, the adhesive tape 2 is generally adhered along both end surfaces of the battery cell 1. One end of the adhesive tape 2 is pasted on one surface of the battery cell 1, and the other end of the adhesive tape 2 bypasses one end face of the battery cell 1 and is pasted on the other surface of the battery cell 1, so that the shape of the battery cell 1 is fixed.
Step two: and (3) putting the battery core 1 into a battery shell, and injecting an electrolyte to obtain the battery.
Step three: and (3) testing the storage performance of the battery after the step (II) is completed, wherein the temperature reaches 45-60 ℃, micropores 3 with the aperture of 20-50 um are formed on the adhesive tape 2, the specific apertures of 20um, 25um, 30um, 35um, 42um, 48um, 50um and the like, and the micropores 3 are used for allowing electrolyte to enter the battery core 1 to complete the preparation of the battery.
Further, the pore diameter of the micropores 3 formed in the adhesive tape 2 gradually increases from the base material layer to the rubber layer. When the adhesive tape 2 is used for winding and fixing the battery cell 1, specifically, the adhesive layer of the adhesive tape 2 is contacted with the surface of the battery cell 1, so that the adhesive tape 2 is bonded and fixed with the battery cell 1. Therefore, when injecting electrolyte into electric core 1, electrolyte flows through the substrate layer earlier and flows through the glue film, when micropore 3's aperture was by the substrate layer to glue film grow gradually, can not only improve the efficiency that electrolyte passes through micropore 3, can also play the liquid retaining effect to the electrolyte in electric core 1.
Example 2
A method for preparing a battery is different from that of the embodiment 1 in that in the third step, the battery which completes the second step is subjected to a storage performance test, the temperature reaches 60-70 ℃, and micropores 3 with the pore diameter of 50-70 um are formed on an adhesive tape 2.
Example 3
The difference between the preparation method of the battery and the embodiment 1 is that in the third step, the battery which finishes the second step is subjected to a formation processing step, the temperature reaches 70-80 ℃, and micropores 3 with the pore diameter of 70-100 um are formed on an adhesive tape 2.
Example 4
The difference between the preparation method of the battery and the embodiment 1 is that the base material layer of the adhesive tape 2 is the polyterephthalic acid, and the adhesive layer is the silica gel.
Comparative example 1
A method for manufacturing a battery, which is different from that of example 1, in that in the first step, an adhesive tape 2 without forming a micropore 3 is used to wind and fix a battery cell 1.
And (3) performance testing:
(1) testing the charge and discharge performance of the battery: the batteries prepared in each example and comparative example were discharged to 0.005V at a constant current of 0.1mA at normal temperature and then charged to 1.5V at a constant current of 0.1mA, the discharge capacity and the charge capacity of the batteries were recorded, and the charge-discharge efficiency (%) -discharge capacity/charge capacity × 100% was calculated. The test results are shown in table 1.
TABLE 1
| G.discharge capacity/mAh-1 | Charge capacity/mAh.g-1 | Efficiency of discharge/%) | |
| Example 1 | 129 | 142 | 90.85％ |
| Example 2 | 132 | 144 | 91.67％ |
| Example 3 | 135 | 146 | 92.47％ |
| Example 4 | 130 | 143 | 90.97％ |
| Comparative example 1 | 118 | 140 | 84.29％ |
(1) And (3) battery cycle test: the batteries prepared in each example and comparative example were charged at a constant current of 200mA to 4.85V at a constant voltage and a charge cut-off current of 20mA at normal temperature, and then discharged at a constant current of 200mA to 3.0V, and the first charge capacity and discharge capacity were recorded and the discharge efficiency (%) was calculated. After repeating the charge and discharge cycles 20, 40, 80, and 100 times in this manner, the discharge capacities at 20 th, 40 th, 80 th, and 100 th cycles were recorded, and the capacity retention (%) after cycles was calculated as discharge capacity/first discharge capacity × 100% for 100 cycles; the cut-off voltage was 4.8V). The test results are shown in Table 2.
TABLE 2
(2) Testing the infiltration rate of the battery cell pole piece: measuring and evaluating the wettability of the electrolyte on the pole piece by calculation by adopting a weighing method, namely measuring and evaluating the wettability by the liquid absorption amount on the pole piece; the method specifically comprises the following steps:
A. standing the batteries prepared in the embodiments and the comparative examples for 10 hours, respectively disassembling the battery core, taking out the complete pole pieces, standing for 8min in An environment of normal temperature and normal pressure, weighing for 3 times after the electrolyte on the surfaces of the pole pieces is completely volatilized, weighing for the next time at An interval of 1min after each time of weighing, marking the weights of each time as A1, A2 and A3, and calculating the average value An of A1, A2 and A3.
B. Each pole piece was placed in an oven at 80 ℃ for 13h under vacuum-80 KPa, and each pole piece was then individually weighed and individually labeled B.
C. The liquid absorption amount of each pole piece is calculated by the liquid absorption amount of the pole piece, namely (An-B)/B, and the liquid absorption amount is the infiltration rate of the electrolyte in the pole piece, wherein An is the weight of the pole piece after liquid absorption, and B is the weight of the pole piece before liquid absorption, and the test results of each example and comparative example are specifically shown in Table 3.
TABLE 3
| Item | Example 1 | Example 2 | Example 3 | Example 4 | Comparative example 1 |
| A1 | 7.228 | 7.267 | 7.301 | 7.230 | 6.884 |
| A2 | 7.213 | 7.248 | 7.286 | 7.214 | 6.859 |
| A3 | 7.205 | 7.235 | 7.274 | 7.207 | 6.843 |
| B | 6.763 | 6.760 | 6.759 | 6.762 | 6.761 |
| Liquid absorption of pole piece | 0.067 | 0.072 | 0.078 | 0.067 | 0.025 |
According to tables 1-2 and comparing examples 1-4 and comparative example 1, it can be seen that the adhesive tapes capable of forming micropores are used for winding and fixing the two end parts of the battery core, the discharge efficiency of the prepared battery is over 90%, and after 100 charge and discharge cycles, the capacity retention rate can be over 80, that is, the charge and discharge rate and the cycle performance of the battery are remarkably improved.
As can be seen from table 3 by comparing examples 1 to 4 and comparative example 1, in the test of the infiltration rate of the battery cell pole piece, after the preparation method of the present application is adopted, the liquid absorption amount of the battery cell pole piece is increased from 0.025 to 0.065 or more, that is, the infiltration effect of the battery cell pole piece is significantly improved.
As can be seen from tables 1 to 3 and comparative examples 1 to 3, the larger the pore size of the micropores, the more significant the effect of improving the impregnation with the electrolyte, and at the same time, the better the charge and discharge performance and cycle performance of the resulting battery.
Variations and modifications to the above-described embodiments may also occur to those skilled in the art from the disclosure and teachings of the above specification. Therefore, the present application is not limited to the above-mentioned embodiments, and any obvious improvement, replacement or modification made by those skilled in the art based on the present application is within the protection scope of the present application. In addition, although specific terms are used herein, they are used in a descriptive sense only and not for purposes of limitation.
Claims (10)
1. A method of making a battery comprising the steps of:
the method comprises the following steps: winding an adhesive tape on the coiled battery cell to fix the shape of the battery cell;
step two: the battery core is arranged in a battery shell, and electrolyte is injected to obtain a battery;
step three: and (5) placing the battery after the step two under a heating condition, and forming micropores for allowing electrolyte to enter the battery core on the adhesive tape to finish the preparation of the battery.
2. The method according to claim 1, wherein the heating temperature is 45 ℃ to 80 ℃, and the pore diameter of the micropores is 20um to 100 um.
3. The method according to claim 2, wherein the heating temperature is 70 ℃ to 80 ℃, and the pore diameter of the micropores is 70um to 100 um.
4. The method of claim 1, wherein the adhesive tape is bonded along two end surfaces of the cell.
5. The method for preparing a battery according to any one of claims 1-4, wherein in the second step, the micropores formed on the adhesive tape are uniformly distributed.
6. The method for preparing a battery as claimed in claim 5, wherein in the second step, the porosity of the adhesive tape is 40-60%.
7. The method of claim 1, wherein the adhesive tape comprises an adhesive layer and a substrate layer disposed on the adhesive layer, the adhesive layer is bonded to the battery cell, and the pore diameter of the micro-pores gradually increases from the substrate layer to the adhesive layer.
8. The method of claim 7, wherein the adhesive layer is at least one of acrylic adhesive and silicone adhesive.
9. The method of claim 7, wherein the substrate layer is at least one of polypropylene, polyethylene terephthalate, polyethylene glycol, and polyimide.
10. A battery produced by the method for producing a battery according to any one of claims 1 to 9.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114204133A (en) * | 2021-12-09 | 2022-03-18 | 惠州亿纬锂能股份有限公司 | Method for solving expansion of winding type battery cell |
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Application publication date: 20211001 |