CN116014083A - Manufacturing process of lithium ion battery capable of preventing tab from being reversely inserted and lithium ion battery - Google Patents
Manufacturing process of lithium ion battery capable of preventing tab from being reversely inserted and lithium ion battery Download PDFInfo
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- CN116014083A CN116014083A CN202310125900.8A CN202310125900A CN116014083A CN 116014083 A CN116014083 A CN 116014083A CN 202310125900 A CN202310125900 A CN 202310125900A CN 116014083 A CN116014083 A CN 116014083A
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- hot melt
- melt adhesive
- tab
- lithium ion
- ion battery
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 43
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 43
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 41
- 239000004831 Hot glue Substances 0.000 claims abstract description 95
- 238000000576 coating method Methods 0.000 claims abstract description 42
- 239000011248 coating agent Substances 0.000 claims abstract description 35
- 238000010438 heat treatment Methods 0.000 claims abstract description 31
- 238000003780 insertion Methods 0.000 claims abstract description 21
- 230000037431 insertion Effects 0.000 claims abstract description 21
- 238000003466 welding Methods 0.000 claims abstract description 18
- 239000011888 foil Substances 0.000 claims abstract description 15
- 238000005520 cutting process Methods 0.000 claims abstract description 14
- 239000000758 substrate Substances 0.000 claims abstract description 14
- 238000004804 winding Methods 0.000 claims abstract description 9
- 239000000853 adhesive Substances 0.000 claims abstract description 8
- 230000001070 adhesive effect Effects 0.000 claims abstract description 8
- 238000007581 slurry coating method Methods 0.000 claims abstract description 8
- 239000013543 active substance Substances 0.000 claims abstract description 5
- 239000003292 glue Substances 0.000 claims abstract description 4
- 238000003825 pressing Methods 0.000 claims description 24
- 238000000034 method Methods 0.000 claims description 21
- 230000008569 process Effects 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 8
- 239000011149 active material Substances 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 5
- 238000007664 blowing Methods 0.000 claims description 4
- 239000011247 coating layer Substances 0.000 claims description 4
- 230000017525 heat dissipation Effects 0.000 claims description 2
- 238000012546 transfer Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000010410 layer Substances 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000007306 turnover Effects 0.000 description 2
- 208000019901 Anxiety disease Diseases 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000036506 anxiety Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000012858 packaging process Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009967 tasteless effect Effects 0.000 description 1
Images
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The invention relates to the technical field of batteries, and discloses a manufacturing process of a lithium ion battery capable of preventing tab from being inserted backwards and the lithium ion battery. The manufacturing process comprises the following steps: providing an anode plate, a diaphragm and a cathode plate; the manufacturing method of the anode plate and/or the cathode plate comprises the following steps: providing a substrate, wherein the substrate comprises an edge empty foil area, a glue coating area and a slurry coating area which are sequentially distributed along the width direction of the substrate; coating hot melt adhesive in the adhesive coating area, and coating active substance coating in the slurry coating area; laser die cutting is carried out on the edge empty foil area to form a tab group; winding the anode sheet, the diaphragm and the cathode sheet into a whole, so that all the tabs in the same tab group are arranged in a stacking way; heating the hot melt adhesive to bond all the lugs in the same lug group through the hot melt adhesive; the edge blank area is joined to the transfer sheet by ultrasonic welding. According to the invention, through adding the hot melt adhesive coating process and the heating process, the phenomenon of tab reverse insertion can be effectively prevented, and the safety performance of the lithium ion battery is ensured.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a manufacturing process of a lithium ion battery for preventing tab reverse insertion and the lithium ion battery.
Background
With the rapid development of lithium ion battery technology, more and more people choose new energy automobiles as their own vehicles, but in recent years, battery combustion events occur, so that the safety problem of batteries is also receiving widespread attention.
In order to solve the anxiety of people on the endurance mileage, each big battery manufacturer gradually increases the capacity of the single battery core, and adopts a high nickel system to increase the single energy density, so that the safety requirement on the single battery core is higher;
the single battery cell is often composed of a single or a plurality of bare battery cells, the bare battery cells are usually manufactured in a winding mode, and two tabs of a cathode and an anode are arranged on the same side, wherein the main assembly mode is that the tabs are combined with the adapter sheet through ultrasonic welding firstly, and then the adapter sheet is welded on the top cover through laser welding.
In order to meet the greater fault tolerance in the ultrasonic welding process of the tab and the switching piece, people often reserve the tab with enough length to meet the ultrasonic welding operation requirement of the tab and the switching piece, and this causes the distance redundancy between welding and printing and the pole piece, and then causes inconsistent trend of the tab in the battery cell assembly process, so that part of the tab is reversely inserted into the bare battery cell, and finally, the situation of short circuit, poor self-discharge and the like is caused by the contact of the cathode and the anode, so that very serious safety risks are caused.
For the problem of tab reverse insertion, some solutions have been proposed at present, such as adjusting the welding position and the welding height, but these measures only reduce the tab reverse insertion ratio from the process, and cannot completely solve the problem of tab reverse insertion, and some measures also increase the production cost, and the effect is poor after the introduction.
With the continuous increase of the design capacity of the lithium ion battery, the number of layers of the tab becomes larger, and if no very effective measures are taken, the problem of tab reverse insertion becomes more and more serious.
Disclosure of Invention
The invention aims to provide a manufacturing process of a lithium ion battery for preventing tab reverse insertion and the lithium ion battery, so as to solve the problem that the tab in the prior art is easy to be reversely inserted into a bare cell.
To achieve the purpose, the invention adopts the following technical scheme:
a manufacturing process of a lithium ion battery for preventing tab from being reversely inserted, the lithium ion battery comprises at least one bare cell, and the manufacturing steps of the bare cell comprise:
providing an anode plate, a diaphragm and a cathode plate; the manufacturing method of the anode plate and/or the cathode plate comprises the following steps: providing a substrate, wherein the substrate comprises an edge empty foil area, a glue coating area and a slurry coating area which are sequentially distributed along the width direction of the substrate; coating hot melt adhesive on one side or both sides of the adhesive coating area, and coating an active substance coating on the slurry coating area; laser die cutting is carried out on the edge empty foil area of the base material to form a tab group consisting of a plurality of tabs which are sequentially arranged at intervals along the length direction of the base material;
sequentially stacking and winding the anode sheet, the diaphragm and the cathode sheet into a whole, so that all the tabs in the same tab group are stacked and arranged;
and heating the hot melt adhesive to enable all tabs in the same tab group to be adhered by the hot melt adhesive.
Optionally, the method for heating the hot melt adhesive comprises the following steps:
providing a pressing plate of ultrasonic welding equipment, wherein a heating element is arranged in the pressing plate;
and pressing the pressing plate on the tab group, controlling the heating element to heat, and transmitting heat to the hot melt adhesive on the tab group through the pressing plate until the hot melt adhesive is melted.
Optionally, in the method for heating the hot melt adhesive, the heating temperature of the pressing plate ranges from 80 ℃ to 90 ℃, and the heating time of the hot melt adhesive ranges from 2s to 5s.
Optionally, the manufacturing step of the bare cell further includes: and immediately after the hot melt adhesive is heated, cooling the hot melt adhesive.
Optionally, the method for cooling the hot melt adhesive comprises the following steps: and carrying out air blowing and heat dissipation on the root area of the tab.
Optionally, the width of the edge empty foil area is not more than 0.5mm, the coating width of the hot melt adhesive ranges from 10mm to 15mm, and the single-sided coating thickness of the hot melt adhesive ranges from 10 mu m to 40 mu m.
Optionally, in the step of laser die-cutting the edge blank foil area of the substrate and the adhesive coating area coated with the hot melt adhesive, only an area of the hot melt adhesive in the width direction thereof, which is far away from the active material coating layer, is die-cut for the hot melt adhesive, and an area of the hot melt adhesive in the width direction thereof, which is adjacent to the active material coating layer, is reserved.
Optionally, the width of the reserved area of the hot melt adhesive ranges from 1mm to 5mm.
Optionally, the number of the bare cells is two, and the manufacturing process of the lithium ion battery further includes: the tab groups of the two bare cells are paired firstly, and then the hot melt adhesive is heated, so that the paired different tab groups of the two bare cells are adhered through the hot melt adhesive.
The lithium ion battery is manufactured according to the manufacturing process for preventing the tab from being inserted backwards.
Compared with the prior art, the embodiment of the invention has the following beneficial effects:
according to the embodiment of the invention, the hot melt adhesive coating process and the hot melt adhesive heating process are additionally arranged, so that the hardness of the lug after die cutting can be increased by utilizing the hot melt adhesive in the early stage, the turnover of the lug in the winding process is avoided, the multi-layer lugs in the same lug group can be orderly and tightly combined by utilizing the sticky hot melt adhesive before the ultrasonic welding operation, the effects of shaping and fixing the root parts of the lugs are achieved, the stable trend of the lugs is ensured, and the lugs are not randomly and reversely inserted into the bare cell during the subsequent assembling and packaging process, so that the embodiment of the invention can effectively prevent the occurrence of the lug reverse insertion phenomenon, and ensure the safety performance of the lithium ion battery.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.
Fig. 1 is a flow chart of manufacturing a bare cell in a lithium ion battery provided in an embodiment of the invention;
FIG. 2 is a schematic illustration of a pole piece structure after coating of hot melt adhesive and slurry according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a pole piece after die cutting of a pole lug according to an embodiment of the present invention;
fig. 4 (1) and (2) are schematic structural diagrams of a conventional bare cell and a bare cell provided in an embodiment of the present invention;
fig. 5 is a schematic structural view of a platen of an ultrasonic welding apparatus according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of an ultrasonic welded lithium ion battery according to an embodiment of the present invention;
fig. 7 (1) and (2) are schematic structural diagrams of a single bare cell provided in an embodiment of the present invention before and after hot melt adhesive heating;
fig. 8 (1) and (2) are schematic structural diagrams of two bare cells provided in the embodiment of the present invention before and after the hot melt adhesive is heated.
Reference numerals illustrate:
the solar cell comprises an edge empty foil area 1, a hot melt adhesive 2, an active substance coating 3, a tab 4, a pressing plate 5, a heating element 6 and a transfer sheet 7.
Detailed Description
In order to make the objects, features and advantages of the present invention more comprehensible, the technical solutions in the embodiments of the present invention are described in detail below with reference to the accompanying drawings, and it is apparent that the embodiments described below are only some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order to effectively solve the problem that the electrode lug 4 is easy to be inserted into the bare cell, the hot melt adhesive coating process is added in the coating process of lithium ion battery manufacturing, then the processes of rolling, die cutting, slitting, winding and the like of lithium ion battery production are carried out, finally, before the ultrasonic welding process, the electrode lug 4 is heated, so that the hot melt adhesive 2 at the root of the electrode lug 4 is heated to be sticky, and finally, the redundant parts at the root of the electrode lug 4 are adhered and fixed together, the hardness of the root of the electrode lug 4 is increased, the trend of the electrode lug 4 in the folding process is ensured to be consistent, thereby effectively avoiding the situation that the electrode lug 4 is inserted into the bare cell upside down, and ensuring the safety of the lithium ion battery.
Referring to fig. 1, in the manufacturing process of a lithium ion battery provided by the embodiment of the invention, the manufacturing steps of a single bare cell include:
The manufacturing method of the pole piece comprises the following steps: providing a substrate, wherein the substrate comprises an edge empty foil area 1, a glue coating area and a slurry coating area which are sequentially distributed along the width direction of the substrate; coating a hot melt adhesive 2 in an adhesive coating area, and coating an active substance coating 3 in a slurry coating area, as shown in fig. 2; and (3) carrying out laser die cutting on the blank foil area 1 at the edge of the base material to form a tab group consisting of a plurality of tabs 4 which are sequentially arranged at intervals along the length direction of the base material, as shown in fig. 3.
The manufacturing method of the electrode plate is applicable to the anode plate and the cathode plate, and in practical application, the anode plate can be manufactured only according to the manufacturing method, the cathode plate can be manufactured according to the conventional method, the cathode plate can be manufactured only according to the manufacturing method, the anode plate can be manufactured according to the conventional method, and the anode plate and the cathode plate can be manufactured respectively according to the manufacturing method without limitation.
The Hot melt adhesive 2 (English name: hot Glue) is a plastic adhesive, the physical state of which changes with the temperature within a certain temperature range, and the chemical characteristics of which are unchanged, and the Hot melt adhesive is nontoxic and tasteless, and belongs to an environment-friendly chemical product. Typically, the hot melt adhesive 2 will soften and be tacky at temperatures between 70 ℃ and 90 ℃ and will be harder and not tacky at temperatures below 70 ℃. In this step, the hot melt adhesive 2 may be applied by a single-sided coating method or a double-sided coating method.
In the winding process, the hot melt adhesive 2 is harder under the normal temperature condition, so that the hardness of the root area of each tab 4 coated with the hot melt adhesive 2 is obviously enhanced, the turnover proportion of the tab 4 is obviously reduced, and the risk of the subsequent tab 4 reverse insertion is reduced.
In this step, since the hot melt adhesive 2 has the characteristics of softening and having viscosity at the temperature of 70-90 ℃, the hot melt adhesive 2 begins to melt and generate viscosity after being heated to the melting point thereof, so that the tabs 4 in laminated arrangement are adhered to each other, the ordered arrangement and tight combination of the tabs 4 in the tab group are ensured, and the occurrence of the tab 4 reverse insertion condition can be effectively prevented.
In other embodiments, the tab 7 may be omitted and the tab 4 may be directly connected to the post on the top cover.
In summary, the embodiment of the invention can increase the hardness of the tab 4 after die cutting by additionally arranging the hot melt adhesive 2 coating process and the hot melt adhesive 2 heating process in the early stage, so as to avoid the tab 4 from turning over in the winding process, and can orderly and tightly combine the multiple layers of tabs 4 in the same tab group by using the hot melt adhesive 2 with viscosity before the ultrasonic welding operation, thereby achieving the effects of shaping and fixing the tabs 4, ensuring the stable trend of the tabs 4, and ensuring that the tabs 4 are not randomly inserted into the bare cell when being assembled into the shell in the subsequent process.
The width of the edge empty foil area 1 is not more than 0.5mm, the coating width of the hot melt adhesive 2 is 10-15 mm, and the single-sided coating thickness of the hot melt adhesive 2 is 10-40 μm, so that the hardness of the tab 4 after the hot melt adhesive 2 is effectively improved through the optimization of the coating size design of the hot melt adhesive 2, and the melted hot melt adhesive 2 is ensured to have enough viscosity to realize reliable adhesion between the adjacent tabs 4, thereby effectively playing the role of preventing the tab 4 from being folded.
In an alternative embodiment, in the step 101, the method for heating the hot melt adhesive 2 includes: providing a pressing plate 5 of the ultrasonic welding device, wherein a heating element 6 is arranged in the pressing plate 5 as shown in fig. 5; pressing the pressing plate 5 on the tab group, controlling the heating element 6 to heat, and transmitting heat to the hot melt adhesive 2 on the tab group through the pressing plate 5 until the hot melt adhesive 2 is melted.
Illustratively, in order to make the conventional platen 5 have a temperature, the present embodiment may arrange a plurality of resistance wires, or a plurality of solenoids, at a central position above the conventional platen 5. In the subsequent ultrasonic welding process, the device can energize the pressing plate 5 through the hole in the middle of the pressing plate 5, then the resistance wire or the electromagnetic coil can heat the pressing plate 5, and the temperature can be kept in a temperature range capable of melting the hot melt adhesive 2, so that the tab 4 coated with the hot melt adhesive 2 is subjected to heat conduction.
In order to ensure that the hot melt adhesive 2 can fully exert the effect, the heating temperature range of the pressing plate 5 is kept at 80-90 ℃, and the heating time range of the hot melt adhesive 2 is 2-5 s. In the heating process of the hot melt adhesive 2, the pressing plate 5 can be heated to a preset temperature, and then the pressing plate 5 is pressed on the tab group, so that the heating control precision of the hot melt adhesive 2 is ensured.
In addition, since the distance between the coating area of the hot melt adhesive 2 and the separator is relatively short, in order to prevent the adverse phenomenon that the separator contracts and closes the pores due to the overheating of the local temperature, the hot melt adhesive 2 can be immediately cooled after the heating of the hot melt adhesive 2 is completed, so as to ensure that the separator is not affected by the temperature. In actual operation, the purpose of cooling the hot melt adhesive 2 can be achieved by blowing the root position of the tab 4 by using blowing equipment.
In order to further improve the tab reverse insertion prevention performance, in the step of laser die cutting of the edge blank foil area of the base material, laser die cutting can be performed on the adhesive coating area coated with the hot melt adhesive 2 at the same time. Referring to fig. 3, in the step of laser die-cutting the edge blank area 1 of the substrate and the adhesive coating area coated with the hot melt adhesive 2, for the hot melt adhesive 2, only the area of the hot melt adhesive 2 in the width direction thereof away from the active material coating 3 may be die-cut, leaving the area of the hot melt adhesive 2 in the width direction thereof adjacent to the active material coating 3. The width of the reserved area of the hot melt adhesive 2 can be selected to be 1mm to 5mm.
The laser die cutting position is located in the hot melt adhesive 2 area and mainly has the following functions: the size and number of die cut edge burrs are reduced.
It should be noted that, in the embodiment of the present invention, the lithium ion battery may include a single bare cell, and the root of the tab 4 of the single bare cell is shown in fig. 7 in the state before and after heating; the lithium ion battery can also comprise two bare cells, at this time, after the manufacture of the two bare cells is completed, the tab groups of the two bare cells are paired first, and then the hot melt adhesive 2 is heated, so that the paired different tab groups of the two bare cells are bonded through the hot melt adhesive 2, and the effect before and after heating is shown in fig. 8.
The embodiment of the invention also provides a lithium ion battery which is manufactured according to the manufacturing process of the lithium ion battery for preventing the tab 4 from being reversely inserted. In the manufacturing process of the lithium ion battery, the root of the multi-layer tab 4 is shaped and fixed, so that the problem of reverse insertion of the tab 4 of the lithium ion battery is solved, and the lithium ion battery provided by the embodiment of the invention has higher safety performance.
The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the 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 scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The manufacturing process of the lithium ion battery for preventing the tab from being reversely inserted comprises at least one bare cell, and is characterized in that the manufacturing steps of the bare cell comprise:
providing an anode plate, a diaphragm and a cathode plate; the manufacturing method of the anode plate and/or the cathode plate comprises the following steps: providing a substrate, wherein the substrate comprises an edge empty foil area, a glue coating area and a slurry coating area which are sequentially distributed along the width direction of the substrate; coating hot melt adhesive on one side or both sides of the adhesive coating area, and coating an active substance coating on the slurry coating area; laser die cutting is carried out on the edge empty foil area of the base material to form a tab group consisting of a plurality of tabs which are sequentially arranged at intervals along the length direction of the base material;
sequentially stacking and winding the anode sheet, the diaphragm and the cathode sheet into a whole, so that all the tabs in the same tab group are stacked and arranged;
and heating the hot melt adhesive to enable all tabs in the same tab group to be adhered by the hot melt adhesive.
2. The process for manufacturing a lithium ion battery for preventing tab back insertion according to claim 1, wherein the method for heating the hot melt adhesive comprises the following steps:
providing a pressing plate of ultrasonic welding equipment, wherein a heating element is arranged in the pressing plate;
and pressing the pressing plate on the tab group, controlling the heating element to heat, and transmitting heat to the hot melt adhesive on the tab group through the pressing plate until the hot melt adhesive is melted.
3. The manufacturing process of the lithium ion battery for preventing tab reverse insertion according to claim 2, wherein in the method for heating the hot melt adhesive, the heating temperature of the pressing plate ranges from 80 ℃ to 90 ℃, and the heating time of the hot melt adhesive ranges from 2s to 5s.
4. The manufacturing process of the lithium ion battery for preventing tab reverse insertion according to claim 1, wherein the manufacturing step of the bare cell further comprises: and immediately after the hot melt adhesive is heated, cooling the hot melt adhesive.
5. The manufacturing process of the lithium ion battery for preventing tab reverse insertion according to claim 4, wherein the method for cooling the hot melt adhesive is as follows: and carrying out air blowing and heat dissipation on the root area of the tab.
6. The manufacturing process of the lithium ion battery for preventing tab reverse insertion according to claim 1, wherein the width of the edge empty foil area is not more than 0.5mm, the coating width of the hot melt adhesive ranges from 10mm to 15mm, and the single-sided coating thickness of the hot melt adhesive ranges from 10 μm to 40 μm.
7. The process for manufacturing a lithium ion battery for preventing tab back insertion according to claim 1, wherein in the step of laser die-cutting the edge blank area of the base material, the area of the hot melt adhesive in the width direction thereof away from the active material coating layer is die-cut at the same time, and the area of the hot melt adhesive in the width direction thereof adjacent to the active material coating layer is remained.
8. The process for manufacturing a lithium ion battery for preventing tab back insertion according to claim 7, wherein the width of the reserved area of the hot melt adhesive ranges from 1mm to 5mm.
9. The manufacturing process of the lithium ion battery for preventing tab reverse insertion according to claim 1, wherein the number of the bare cells is two, and the manufacturing process of the lithium ion battery further comprises: the tab groups of the two bare cells are paired firstly, and then the hot melt adhesive is heated, so that the paired different tab groups of the two bare cells are adhered through the hot melt adhesive.
10. A lithium ion battery, characterized in that the battery is manufactured according to the manufacturing process of the lithium ion battery for preventing the reverse insertion of the tab according to any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310125900.8A CN116014083A (en) | 2023-02-16 | 2023-02-16 | Manufacturing process of lithium ion battery capable of preventing tab from being reversely inserted and lithium ion battery |
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| CN202310125900.8A CN116014083A (en) | 2023-02-16 | 2023-02-16 | Manufacturing process of lithium ion battery capable of preventing tab from being reversely inserted and lithium ion battery |
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| CN116014083A true CN116014083A (en) | 2023-04-25 |
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