CN113903971A - Slat battery chip - Google Patents
Slat battery chip Download PDFInfo
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- CN113903971A CN113903971A CN202111131176.7A CN202111131176A CN113903971A CN 113903971 A CN113903971 A CN 113903971A CN 202111131176 A CN202111131176 A CN 202111131176A CN 113903971 A CN113903971 A CN 113903971A
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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
- H01M10/04—Construction or manufacture in general
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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
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Manufacturing & Machinery (AREA)
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- General Chemical & Material Sciences (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The invention relates to a strip plate battery chip, which is characterized in that: between the lamination process and the coating process, sheets with the thickness of 0.3-0.5mm are manufactured by graphene, two graphene sheets are placed on the bottommost layer and the topmost layer of the laminated battery cell, and the two graphene sheets are tightly adhered and fixed by a high-temperature adhesive tape, so that the hardness of the laminated battery cell is enhanced, and the battery cell can be conveniently sent into an aluminum square tube; the graphene sheet has the electrolyte adsorption function and the quick heat dissipation function, so that the service life of a finished product battery cell and the effective control of heat management are ensured.
Description
Technical Field
The invention relates to the technical field of battery cell preparation, in particular to a ribbon board battery chip.
Background
In the conventional method for manufacturing the strip battery chip, the strip battery chip is formed by cutting a continuous laminate into a plurality of laminate units and stacking the laminate units.
However, the existing strip battery chip preparation process has the following problems:
(1) in the existing positive and negative pole pulping process, the use of the conductive liquid can not greatly improve the large-current charging/discharging function of the pole piece and can not effectively control the internal temperature of the battery cell.
(2) The existing pole piece punching edge has the phenomena of material falling, cracking and the like, and burrs are easily generated on the edge of a pole piece after punching.
(3) The short circuit phenomenon and the pressure difference phenomenon easily appear in the existing battery core.
Disclosure of Invention
The invention designs a strip battery chip, which solves the technical problems that: (1) in the existing positive and negative pole pulping process, the use of the conductive liquid can not greatly improve the large-current charging/discharging function of the pole piece and can not effectively control the internal temperature of the battery cell. (2) The existing pole piece punching edge has the phenomena of material falling, cracking and the like, and burrs are easily generated on the edge of a pole piece after punching. (3) The short circuit phenomenon and the pressure difference phenomenon easily appear in the existing battery core.
In order to solve the technical problems, the invention adopts the following scheme:
a lath battery chip is characterized in that: between the lamination process and the coating process, sheets with the thickness of 0.3-0.5mm are manufactured by graphene, two graphene sheets are placed on the bottommost layer and the topmost layer of the laminated battery cell, and the two graphene sheets are tightly adhered and fixed by a high-temperature adhesive tape, so that the hardness of the laminated battery cell is enhanced, and the battery cell can be conveniently sent into an aluminum square tube; the graphene sheet has the electrolyte adsorption function and the quick heat dissipation function, so that the service life of a finished product battery cell and the effective control of heat management are ensured.
Preferably, graphene conductive liquid is added during the preparation of the positive and negative electrode plates, so that the large-current charging/discharging function of the electrode plates is improved; meanwhile, the problem that the internal temperature of the battery cell is increased to obtain a controllable range when the battery cell is charged/discharged at a high rate is solved, and the thermal management is effectively controlled after the battery cells are stacked into a battery pack.
Preferably, adopt the continuous automatic die-cut of five metals steel mould when just the negative pole piece is die-cut in the preparation of just, negative pole piece, when avoiding just/the negative pole piece is die-cut, the die-cut edge of pole piece falls the material, bursts apart the phenomenon, reduces die-cut back pole piece edge burr and produces, prevents the inside little short circuit phenomenon of electric core.
Preferably, during anodal welded connection piece, will the PFA material is moulded plastics at electric core end plate medial surface with acid and alkali-resistance high temperature sticky tape bonding to the connection piece for anodal safety spacer forms whole gluey box behind with the apron lock, the connection piece is buckled after welding with electric core end plate and is hidden in gluey box, prevents that electric core from causing inside short circuit because of the structure protection.
Preferably, during negative pole welded connection piece, will the PFA material is moulded plastics at electric core end plate medial surface with acid and alkali-resistance high temperature sticky tape bonding to the connection piece for form whole gluey box behind negative pole safety spacer and the apron lock, the connection piece is buckled after welding with electric core end plate and is hidden in gluey box, prevents that electric core from causing inside short circuit because of the structure protection.
Preferably, after the positive end plate is welded with the aluminum shell in a laser mode, the film is made of high polymer materials to coat the battery cell, the film made of the high polymer materials has a strong electrolyte adsorption function, and meanwhile, the film has good insulativity, so that the liquid retention capacity can be guaranteed when the battery cell works subsequently, and the phenomena of internal short circuit and pressure difference caused by the contact of the strip battery chip and the aluminum shell are prevented.
Preferably, after the negative end plate is welded with the aluminum shell in a laser mode, the film is made of high polymer materials to coat the battery cell, the film made of the high polymer materials has a strong electrolyte adsorption function, and meanwhile, the film has good insulativity, so that the liquid retention capacity can be guaranteed when the battery cell works subsequently, and the phenomenon of internal short circuit and pressure difference caused by the contact of a strip battery chip and the aluminum shell is prevented.
Preferably, when the positive end plate is manufactured, silicon oxide and metal are sealed between the electrode post and the end plate in a brazing mode to replace the original PFA and metal conductive post riveting process, the sealing performance of the post and the end plate is improved, and meanwhile, the phenomenon of liquid leakage caused by aging of a PFA rubber ring when a finished battery is used in the future can be avoided.
Preferably, when the negative end plate is manufactured, silicon oxide and metal are sealed between the electrode post and the end plate in a brazing mode to replace the original PFA and metal conductive post riveting process, the sealing performance of the post and the end plate is improved, and meanwhile, the phenomenon of liquid leakage caused by aging of a PFA rubber ring when a finished battery is used in the future can be avoided.
A manufacturing method of a strip battery chip sequentially comprises the following steps: pulping the positive electrode and the negative electrode; coating the positive electrode and the negative electrode; rolling the positive and negative plates; cutting the positive and negative plates; positive and negative pole stamped steel; coating/coating graphene sheets/laminates; welding copper/aluminum foil; welding a connecting sheet on the positive aluminum foil; sleeving a positive electrode safety spacing ring; the folded tab/positive connecting piece is welded with an end plate; welding a connecting sheet on the cathode aluminum foil; putting the battery core into a shell; short circuit detection; welding the positive end plate and the aluminum shell by laser; sleeving a negative electrode safety space ring; the folded tab/negative electrode connecting sheet is welded with an end plate; laser welding the negative end plate and the aluminum shell; the tightness of the cell after welding and X-ray detection are carried out; baking the battery cell in high vacuum; detecting the moisture of the baked battery cell; injecting liquid into the battery cell for the first time; activating the battery cell; pre-charging the battery cell; secondary liquid supplement is carried out on the battery cell; sealing and welding the liquid injection port; detecting the voltage/internal resistance for the first time; aging at high temperature; detecting the voltage/internal resistance for the second time; grading the capacity of the battery core; aging at normal temperature; and (5) finishing the battery core.
Compared with the prior art, the batten battery chip and the manufacturing method thereof have the following beneficial effects:
(1) according to the method, between the lamination process and the coating process, 0.3-0.5mm of sheets are produced in the graphene, two graphene sheets are placed on the bottommost layer and the topmost layer of the laminated battery cell, and the two graphene sheets are tightly adhered and fixed by a high-temperature adhesive tape, so that the hardness of the laminated battery cell is enhanced, and the battery cell can be conveniently sent into an aluminum square tube; the graphene sheet has the electrolyte adsorption function and the quick heat dissipation function, so that the service life of a finished product battery cell and the effective control of heat management are ensured.
(2) According to the invention, graphene is used as a positive electrode ingredient and a negative electrode ingredient to promote the large-current charging/discharging of the pole pieces, and meanwhile, the thermal management can be effectively controlled after the cells are stacked into a battery pack.
(3) According to the invention, the connecting sheet (except a welding area) is bonded by an acid-base-resistant high-temperature adhesive tape with the thickness of 200 mu m, and PFA material is injected on the inner side surface of the cell end plate, so that the safety spacer sleeve and the cover plate are buckled to form an integral rubber box, and the connecting sheet is bent and hidden in the rubber box after being welded with the cell end plate, thereby preventing the internal short circuit of the cell caused by structural protection.
(4) The battery core is coated by the film made of the high polymer material for one circle, the film made of the high polymer material has the function of strongly adsorbing electrolyte and good insulativity, the liquid retention capacity can be ensured when the battery core works subsequently, and the internal short circuit and the pressure difference phenomenon caused by the contact of the batten battery chip and the aluminum shell can be prevented.
Drawings
FIG. 1: the manufacturing process schematic diagram of the batten battery chip of the invention;
FIG. 2: the invention is a schematic diagram of coating of a positive electrode or a negative electrode;
FIG. 3: according to the invention, the punching schematic diagram of the positive plate or the negative plate is shown;
FIG. 4: schematic representation of the separator paper of the present invention;
FIG. 5: a schematic of the lamination of the present invention;
FIG. 6: the invention discloses a tab fusion welding schematic diagram;
FIG. 7: the positive connecting piece is schematically shown;
FIG. 8: the negative connecting sheet is schematically shown;
FIG. 9: the schematic diagram of the positive electrode safety space ring in the invention;
FIG. 10: the schematic diagram of the negative electrode safety space ring is shown;
FIG. 11: the invention discloses a schematic diagram of an aluminum shell square tube;
FIG. 12: the finished product battery core is schematically shown.
Detailed Description
The invention is further illustrated below with reference to fig. 1:
as shown in fig. 1, the manufacturing process of the strip battery chip of the present invention is as follows:
positive and negative pole pulping, positive and negative pole coating, positive and negative pole rolling, positive and negative pole piece cutting, positive and negative pole punching, film coating/lamination, copper/aluminum foil fusion welding, positive aluminum foil welding connection sheet, anode safety spacer ring sleeving, tab folding/positive connection sheet welding end plate, negative aluminum foil welding connection sheet, cell shell entering, short circuit detection, laser welding of positive end plate and aluminum shell, cathode safety spacer ring sleeving, tab folding/negative connection sheet welding end plate, laser welding of negative end plate and aluminum shell, cell sealing after welding and X-ray detection, cell high vacuum baking, cell moisture detection after baking, first liquid injection of cell, cell activation, cell pre-charging, second liquid injection, sealing of liquid injection port, first voltage/internal resistance detection, high temperature aging, second voltage/internal resistance detection, cell capacity separation, normal temperature aging -a finished electrical core.
In the above process, the improvement point of the invention mainly comprises the following aspects:
1. in the positive and negative electrode pulping process, graphene conductive liquid is added during the positive and negative electrode batching, so that the large-current charging/discharging function of the pole piece is mainly improved; meanwhile, the problem that the internal temperature of the battery cell is increased to obtain a controllable range when the battery cell is charged/discharged at a high rate is solved, and the thermal management is effectively controlled after the battery cells are stacked into a battery pack.
2. According to the process, the continuous automatic punching of the pole piece is realized by adopting the hardware steel die, the previous laser cutter die punching production mode is replaced, the phenomena of material falling, cracking and the like of the punched edge of the pole piece are avoided when the positive/negative pole piece is punched, the generation of burrs at the edge of the punched pole piece is reduced, and the micro short circuit phenomenon in the battery cell is prevented.
3. Electric core welded connection piece will connect the piece (remove welding area) with 200um thickness acid and alkali-resistance high temperature sticky tape bonding, and the PFA material of moulding plastics of electric core end plate medial surface again for form whole gluey box behind safety spacer and the apron lock, the connection piece is buckled after welding with electric core end plate and is hidden in gluey box, prevents that electric core from causing inside short circuit because of the structure protection.
4. After the lamination of the back battery core and the battery end plate is welded, the high polymer material is used for manufacturing a film to coat the battery core for a circle, the high polymer material is used for manufacturing the film to have a strong electrolyte adsorption function, and meanwhile, the high polymer material has good insulativity, so that the liquid retention amount can be ensured to be provided during the subsequent work of the battery core, and the internal short circuit and the pressure difference phenomenon caused by the contact of the batten battery chip and the aluminum shell are prevented.
5. When the process is used for manufacturing the cell end plate, silicon oxide and metal are adopted between the electrode post and the end plate to carry out sealing in a brazing mode to replace the original PFA and metal conductive post riveting process, the novel process improves the sealing performance of the post and the end plate, and meanwhile, the phenomenon of liquid leakage caused by aging of a PFA rubber ring when a finished product battery is used in the future can be avoided.
6. Placing two graphene sheets on the bottom layer and the top layer of the laminated battery cell after the graphene is processed into sheets of 0.3-0.5mm, and tightly adhering and fixing the two graphene sheets by using a high-temperature adhesive tape so as to enhance the hardness of the laminated battery cell and facilitate the battery cell to be sent into an aluminum square tube; the graphene sheet has the electrolyte adsorption function and the quick heat dissipation function, so that the service life of a finished product battery cell and the effective control of heat management are ensured.
As shown in FIG. 2, when the positive electrode is coated, an aluminum foil substrate with a thickness of 20 μm is used, and both sides of the aluminum foil substrate with a thickness of 20 μm are coated with 318g/m2Thickness active. Coating the negative electrode, namely coating 147g/m on two sides of a copper foil substrate with the thickness of 12 mu m by adopting an aluminum foil substrate with the thickness of 12 mu m2Thickness active.
Fig. 3 shows the shape of the positive and negative pole pieces.
As shown in figure 4, the diaphragm material is a PP, PE or PP PE three-layer composite film, a dry method single-item stretching process is adopted, the thickness of the diaphragm substrate part is 6um, 2um ceramic powder is coated on two sides of the diaphragm respectively, the total thickness is 20um, and the diaphragm W =904 +/-0.3 mm.
As shown in figure 5, the battery core needs to be fixed by brown high-temperature adhesive tape after lamination, the specific fixing position is shown in figure 5, the high-temperature adhesive tape adopts a specification with the thickness of 25 mu m and the width of 30 +/-1 mu m, and the base material of the high-temperature adhesive tape adopts acid and alkali resistant materials.
As shown in fig. 6, when the tab is welded, all the copper foils or aluminum foils are completely welded, so as to prevent a part of the single copper foils or aluminum foils from being broken during welding, and after the copper foils or aluminum foils are welded, the surface needs to be smooth, and metal scraps cannot be reserved, so that the laser welding effect of the connecting band is not affected.
As shown in fig. 7, the positive connecting piece adopts a flexible AL303 aluminum strip. The surface of the aluminum strip is free of oil stains. The edge is smooth and has no burr, and the aluminum belt is covered by brown high-temperature adhesive tape. The brown high-temperature adhesive tape has a thickness of 50-100 μm, and two ends of the aluminum tape are exposed for 5mm during coating.
As shown in figure 8, the negative connecting sheet adopts a flexible pure nickel strap, the surface of the nickel strap is free from oil stain, the edge is smooth and free from burrs, the nickel strap is coated by a tawny high-temperature adhesive tape, the thickness of the tawny high-temperature adhesive tape is 50-100 mu m, and the two ends of the nickel strap are exposed by 5mm during coating.
As shown in FIG. 9, the positive electrode safety spacer is made of acid and alkali resistant materials through injection molding, male and female buttons are formed on the spacer and the positive electrode cover plate through injection molding, and an integral box shape is formed after installation, and the finished spacer is not required to be provided with burrs, so that the surface of the injection molding is ensured to be smooth.
As shown in figure 10, the negative electrode safety space ring is made of acid-alkali resistant materials through injection molding, male and female buttons are formed on the space ring and the positive electrode cover plate through injection molding, and an integral box shape is formed after installation, and the finished space ring is not required to be provided with burrs, so that the surface of the injection molding is required to be smooth.
As shown in FIG. 11, the aluminum shell is formed by drawing AL303 aluminum, and the thickness of the shell wall is 0.8 +/-0.5 mm. And the finished product of the square tube of the aluminum shell has smooth shell openings at two ends, and can not have metal chips, and the surface of the square tube can not have scratches or oil stains.
As shown in fig. 12, the appearance of the finished battery cell is schematically illustrated, and the finished battery cell has positive and negative electrodes.
The invention is described above with reference to the accompanying drawings, it is obvious that the implementation of the invention is not limited in the above manner, and it is within the scope of the invention to adopt various modifications of the inventive method concept and solution, or to apply the inventive concept and solution directly to other applications without modification.
Claims (9)
1. A lath battery chip is characterized in that: between the lamination process and the coating process, sheets with the thickness of 0.3-0.5mm are manufactured by graphene, two graphene sheets are placed on the bottommost layer and the topmost layer of the laminated battery cell, and the two graphene sheets are tightly adhered and fixed by a high-temperature adhesive tape, so that the hardness of the laminated battery cell is enhanced, and the battery cell can be conveniently sent into an aluminum square tube; the graphene sheet has the electrolyte adsorption function and the quick heat dissipation function, so that the service life of a finished product battery cell and the effective control of heat management are ensured.
2. The strip battery chip according to claim 1, wherein: graphene conductive liquid is added during the preparation of the positive electrode and the negative electrode, so that the large-current charging/discharging function of the electrode is improved; meanwhile, the problem that the internal temperature of the battery cell is increased to obtain a controllable range when the battery cell is charged/discharged at a high rate is solved, and the thermal management is effectively controlled after the battery cells are stacked into a battery pack.
3. The strip battery chip according to claim 1, wherein: adopt the continuous automatic die-cut of five metals steel mould when just adjusting the negative pole piece die-cut in the preparation of just, negative pole piece, when avoiding just/the negative pole piece is die-cut, the die-cut edge of pole piece falls the material, bursts apart the phenomenon, reduces die-cut back pole piece edge burr and produces, prevents the inside little short circuit phenomenon of electric core.
4. The strip battery chip according to claim 1, wherein:
when the connecting sheet is welded on the positive electrode, the connecting sheet is bonded by an acid-base-resistant high-temperature adhesive tape, and a PFA material is injected on the inner side surface of the cell end plate, so that the positive electrode safety spacer sleeve and the cover plate are buckled to form an integral rubber box, and the connecting sheet and the cell end plate are bent and hidden in the rubber box after being welded, so that internal short circuit of the cell caused by structural protection is prevented;
during negative pole welded connection piece, will the PFA material is moulded plastics at electric core end plate medial surface with acid and alkali-resistance high temperature sticky tape bonding to the connection piece for negative pole safety spacer forms whole gluey box behind negative pole safety spacer and the apron lock, the connection piece is buckled after welding with electric core end plate and is hidden in gluey box, prevents that electric core from causing inside short circuit because of the structure protection.
5. The strip battery chip according to claim 1, wherein:
after the positive end plate and the aluminum shell are welded in a laser mode, the battery core is coated by a film made of high polymer materials, the film made of the high polymer materials has a strong electrolyte adsorption function and good insulativity, the liquid retention capacity can be guaranteed when the battery core works subsequently, and internal short circuit and pressure difference caused by the contact of a batten battery chip and the aluminum shell are prevented;
after the negative end plate is welded with the aluminum shell in a laser mode, the film is made of high polymer materials to coat the battery cell, the film made of the high polymer materials has a strong electrolyte adsorption function, and meanwhile, the film has good insulativity, so that the liquid retention amount can be ensured to be provided during the subsequent work of the battery cell, and the phenomenon of internal short circuit and pressure difference caused by the contact of a batten battery chip and the aluminum shell is prevented.
6. The method for producing a strip battery chip according to claim 1, characterized in that: when the positive end plate is manufactured, silicon oxide and metal are sealed between the electrode pole and the end plate in a brazing mode to replace the original PFA and metal conductive column riveting process, the sealing performance of the pole and the end plate is improved, and meanwhile, the phenomenon of liquid leakage caused by aging of a PFA rubber ring when a finished battery is used in the future can be avoided.
7. The method for producing a strip battery chip according to claim 1, characterized in that: when the negative end plate is manufactured, silicon oxide and metal are sealed between an electrode post and the end plate in a brazing mode to replace the original PFA and metal conductive post riveting process, the sealing performance of the post and the end plate is improved, and meanwhile, the phenomenon of liquid leakage caused by aging of a PFA rubber ring when a finished battery is used in the future can be avoided.
8. A manufacturing method of a strip battery chip sequentially comprises the following steps: pulping the positive electrode and the negative electrode; coating the positive electrode and the negative electrode; rolling the positive and negative plates; cutting the positive and negative plates; positive and negative pole stamped steel; coating/coating graphene sheets/laminates; welding copper/aluminum foil; welding a connecting sheet on the positive aluminum foil; sleeving a positive electrode safety spacing ring; the folded tab/positive connecting piece is welded with an end plate; welding a connecting sheet on the cathode aluminum foil; putting the battery core into a shell; short circuit detection; welding the positive end plate and the aluminum shell by laser; sleeving a negative electrode safety space ring; the folded tab/negative electrode connecting sheet is welded with an end plate; laser welding the negative end plate and the aluminum shell; the tightness of the cell after welding and X-ray detection are carried out; baking the battery cell in high vacuum; detecting the moisture of the baked battery cell; injecting liquid into the battery cell for the first time; activating the battery cell; pre-charging the battery cell; secondary liquid supplement is carried out on the battery cell; sealing and welding the liquid injection port; detecting the voltage/internal resistance for the first time; aging at high temperature; detecting the voltage/internal resistance for the second time; grading the capacity of the battery core; aging at normal temperature; and (5) finishing the battery core.
9. The method for manufacturing a strip battery chip according to claim 8, wherein: between the lamination process and the coating process, sheets with the thickness of 0.3-0.5mm are manufactured by graphene, two graphene sheets are placed on the bottommost layer and the topmost layer of the laminated battery cell, and the two graphene sheets are tightly adhered and fixed by a high-temperature adhesive tape, so that the hardness of the laminated battery cell is enhanced, and the battery cell can be conveniently sent into an aluminum square tube; the graphene sheet has the electrolyte adsorption function and the quick heat dissipation function, so that the service life of a finished product battery cell and the effective control of heat management are ensured.
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| CN202111131176.7A CN113903971A (en) | 2021-09-26 | 2021-09-26 | Slat battery chip |
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| CN202111131176.7A CN113903971A (en) | 2021-09-26 | 2021-09-26 | Slat battery chip |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117410584A (en) * | 2023-12-12 | 2024-01-16 | 中安芯界控股集团有限公司 | Preparation process of high-stability slat battery chip |
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