CN109888186B - Pole piece assembling and positioning method of thin lithium ion battery - Google Patents
Pole piece assembling and positioning method of thin lithium ion battery Download PDFInfo
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- CN109888186B CN109888186B CN201910167818.5A CN201910167818A CN109888186B CN 109888186 B CN109888186 B CN 109888186B CN 201910167818 A CN201910167818 A CN 201910167818A CN 109888186 B CN109888186 B CN 109888186B
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Abstract
The invention belongs to the technical field of electronic products, in particular to a pole piece assembling and positioning method of a thin lithium ion battery, wherein the lithium ion battery comprises a coating layer, a positive pole piece, a negative pole piece and a diaphragm, a first bonding part is arranged at the upper end of the negative pole piece, a second bonding part is arranged at the upper end of the positive pole piece, the steps comprise that a first double-sided bonding layer is arranged on the first bonding part, and the diaphragm is adhered to the negative pole piece through the first double-sided bonding layer; the second double-sided adhesive layer is arranged on the second adhesive part, the positive plate is adhered to the diaphragm through the second double-sided adhesive layer, the first double-sided adhesive layer and the second double-sided adhesive layer both extend to the outer sides of the diaphragm and the positive and negative plates so as to preset positions for adhering the coating layers, the coating layers are coated on the outer sides of the positive and negative plates, and the exposed parts of the first double-sided adhesive layer and the second double-sided adhesive layer are positioned on the outer sides of the positive and negative plates.
Description
Technical Field
The invention belongs to the technical field of electronic products, and particularly relates to a pole piece assembling and positioning method of a thin lithium ion battery.
Background
With the development of the information-oriented society, the amount of information stored in magnetic cards, smart cards, identification cards and bank cards currently used by people is increasing day by day, the traditional electronic card without a power supply can not well meet the requirements of the current society due to the defects of small information amount, poor confidentiality and the like, and therefore, thin lithium ion batteries are applied to the electronic card to improve the information storage amount and the confidentiality of the electronic card.
The traditional lithium ion battery generally adopts an aluminum-plastic film as a shell material of the battery, and the thickness of the traditional lithium ion battery is generally larger than 2mm when the traditional lithium ion battery is thicker, so that a pit is punched on the aluminum-plastic film for conveniently positioning and installing positive and negative pole pieces, and the pole pieces are fixed by using the pit, thereby facilitating subsequent operation; however, for a thin lithium ion battery, the thickness of the thin lithium ion battery is generally less than 1mm, and because the thickness is limited, it is difficult to punch a pit on the aluminum plastic film, which can accommodate and fix the pole piece, thereby increasing the difficulty of positioning the pole piece.
In addition, in the traditional process, the pole piece, the diaphragm and the shell can be positioned by adopting hot-melt pole lug glue and fully coating the pole piece with an adhesive, the integrity of the pole lug and the diaphragm can be damaged by the hot-melt pole lug glue, the phenomena of poor sealing and short circuit can be easily caused, the existing glue is usually adopted as the adhesive, however, the glue is easily dissolved in electrolyte, and the excessive glue easily causes the denaturation of the electrolyte, so that the performance of the battery is abnormal, therefore, the two modes can generate obvious negative effects on the battery, and the production requirement can not be met.
Therefore, it is necessary to develop a novel method for assembling and positioning the pole pieces of the thin lithium ion battery to solve the above technical problems.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a pole piece assembling and positioning method of a thin lithium ion battery, which is beneficial to production.
In order to solve the technical problems, the invention adopts the following technical scheme:
a pole piece assembling and positioning method of a thin lithium ion battery relates to a lithium ion battery which comprises a coating layer, a positive pole piece, a negative pole piece and a diaphragm arranged between the positive pole piece and the negative pole piece, wherein one side of the negative pole piece is provided with a first bonding part, and the corresponding side of the positive pole piece is provided with a second bonding part.
A first double-sided adhesive layer is arranged on the first adhesive part, and the diaphragm is adhered to the negative electrode sheet through the first double-sided adhesive layer; and arranging a second double-sided adhesive layer on the second adhesive part, superposing the positive plate on the diaphragm, and adhering the positive plate on the diaphragm through the second double-sided adhesive layer, wherein the first double-sided adhesive layer and the second double-sided adhesive layer extend to the outer sides of the diaphragm and the positive and negative plates to form exposed adhesive areas, so that the position for adhering the coating layer is preset.
And coating the coating layers on the outer sides of the positive and negative pole pieces, positioning the coating layers on the outer sides of the positive and negative pole pieces through the exposed adhesive areas of the first double-sided adhesive layer and the second double-sided adhesive layer, and finally performing edge sealing treatment.
Compared with the prior art, the pole piece assembling and positioning method provided by the invention has the advantages that the first bonding part and the second bonding part are respectively arranged on the positive pole piece and the negative pole piece, the connection between the positive pole piece and the negative pole piece and the diaphragm is realized by arranging the double-sided bonding layer on the first bonding part and the second bonding part, the semi-finished product battery core is formed, the preset adhesion area formed by the parts of the double-sided bonding layer extending out of the positive pole piece, the negative pole piece and the diaphragm is utilized, and the semi-finished product battery core can be fixed on the coating layer through the adhesion area.
Furthermore, the first double-sided adhesive layer is arranged on one side of the first adhesive part positioned on the negative electrode plate dressing, the second double-sided adhesive layer is arranged on one side of the second adhesive part positioned on the positive electrode plate dressing, the diaphragm is arranged between the dressing surfaces of the positive and negative electrode plates, one side of the dressing is the side of the electrode plates coated with active substances, and the first adhesive part and the second adhesive part are respectively arranged on the upper sides of the active substances. The arrangement mode strengthens the connection between the diaphragm and the pole piece, prevents the risks of deviation, loosening and the like of the diaphragm, and can further protect active substances on the pole piece.
Furthermore, a negative electrode tab is arranged on the first bonding part, a positive electrode tab is arranged on the second bonding part, one end of the first double-sided bonding layer is arranged on the inner side of the negative electrode tab, the other end of the first double-sided bonding layer extends along one side of the positive electrode tab, and the length of the first double-sided bonding layer is limited to the inner side of the positive electrode tab; the second double-sided adhesive layer is arranged on the inner side of the positive electrode tab, the other end of the second double-sided adhesive layer extends along one side of the negative electrode tab, and the length of the second double-sided adhesive layer is limited on the inner side of the negative electrode tab.
Further, in order to ensure the connection stability, the length of the first double-sided adhesive layer is 40% -50% of the tab spacing, and the length of the second double-sided adhesive layer is 40% -50% of the tab spacing, preferably, in order to effectively control the thickness of the battery, the lengths of the first double-sided adhesive layer and the second double-sided adhesive layer are set to be not overlapped with each other. The tab pitch in the present invention refers to the distance between the positive and negative electrode tabs.
Furthermore, the height of the exposed adhesive area of the first double-sided adhesive layer and the second double-sided adhesive layer is at least 0.3-0.5mm, so that the connection stability between the cladding layer and the pole piece is ensured.
Further, the first double-sided adhesive layer and the second double-sided adhesive layer are double-sided PI glue in the prior art, and the PI glue is made of polyimide materials.
Furthermore, the coating layer is a piece, and the coating layer is coated on the outer sides of the positive and negative pole pieces in a folding mode.
It should be noted that the positioning order of the positive and negative pole pieces can be changed.
The invention also provides another pole piece assembling and positioning method of a thin lithium ion battery, the related lithium ion battery comprises a coating layer, a positive pole piece, a negative pole piece and a diaphragm arranged between the positive pole piece and the negative pole piece, one side of the negative pole piece is provided with a first bonding part, one side of the positive pole piece is provided with a second bonding part, the first bonding part is provided with a negative pole lug, the width of the first bonding part is larger than that of the negative pole lug, the second bonding part is provided with a positive pole lug, and the width of the second bonding part is larger than that of the positive pole lug.
Set up a two-sided adhesive linkage in one side of coating, with the adhesion of first bonding portion on two-sided adhesive linkage, wherein, the length of two-sided adhesive linkage is greater than the width of first bonding portion and second bonding portion, fix the negative pole piece on the coating through two-sided adhesive linkage, superpose the diaphragm on the negative pole piece and with its adhesion on two-sided adhesive linkage, make two-sided adhesive linkage reserve the adhesion region that is used for adhesion second bonding portion and coating in the diaphragm outside, superpose the positive plate in the upside of diaphragm, and adhere second bonding portion on two-sided adhesive linkage, thereby fix the positive plate, coat the coating in the positive and negative pole piece outside, fix the coating in the positive and negative pole piece outside through the exposed adhesion region of two-sided adhesive linkage, carry out the banding at last and handle.
Compared with the prior art, the pole piece assembling and positioning method provided by the invention has the advantages that the double-sided adhesive layer is firstly arranged on the coating layer, the positive and negative pole pieces are fixed by the first adhesive part and the second adhesive part, the positioning of the positive and negative pole pieces and the diaphragm and the coating of the coating layer are completed by only one double-sided adhesive layer, the working procedure is simple and rapid, the material cost is low, the method for realizing the positioning of the pole pieces by arranging the pits on the coating layer in the traditional technology is abandoned, the defects in the prior art are overcome, the pole pieces, the diaphragm and the coating layer are relatively and firmly fixed together, and the risk that the pole pieces and the diaphragm are deviated and even fall off during the subsequent work is avoided.
Furthermore, active materials are coated on one sides of the coating surfaces of the positive and negative pole pieces, the first bonding part and the second bonding part are respectively arranged on the upper sides of the active materials, and the arrangement mode ensures that the double-sided bonding layer is not contacted with the active materials as far as possible so as to avoid influencing the chemical properties of the double-sided bonding layer.
Furthermore, the height of the first bonding part and the second bonding part is 3-5 mm.
Furthermore, the length of the double-sided adhesive layer is larger than or equal to that of the pole piece, and the height of the double-sided adhesive layer is larger than or equal to that of the first adhesive part and the second adhesive part.
Furthermore, the length and the width of the diaphragm are both 1-2mm larger than those of the positive and negative pole pieces, so that the diaphragm is prevented from greatly influencing the bonding of the positive pole piece and the coating layer.
Furthermore, the coating layer is a piece and is coated on the outer side of the positive plate in a folding manner, it should be noted that the positioning sequence of the positive plate and the negative plate can be changed, and if the positive plate is positioned first, the coating layer is coated on the outer side of the negative plate after being folded.
Further, the first double-sided adhesive layer and the second double-sided adhesive layer are double-sided PI glue in the prior art, and the PI glue is made of polyimide materials.
The invention also provides another pole piece assembling and positioning method of the thin lithium ion battery, the related lithium ion battery comprises a coating layer, a positive pole piece, a negative pole piece and a diaphragm arranged between the positive pole piece and the negative pole piece, one side of the negative pole piece is provided with a first bonding part, one side of the positive pole piece is provided with a second bonding part, and the assembling and positioning method comprises the following steps.
Coating an adhesive on one side of the first bonding part, which is positioned on the negative electrode piece dressing, adhering the diaphragm on the negative electrode piece through the adhesive on the first bonding part, coating an adhesive on one side of the second bonding part, which is positioned on the positive electrode piece dressing, and adhering the positive electrode piece on the diaphragm through the adhesive on the second bonding part; and respectively coating adhesives on the sides of the first bonding part and the second bonding part, which are opposite to the dressing surface, coating the coating layers on the outer sides of the positive and negative pole pieces, positioning the coating layers on the outer sides of the positive and negative pole pieces through the adhesives on the sides, and finally performing edge sealing treatment.
Compared with the prior art, the pole piece assembling and positioning method provided by the invention has the advantages that the first bonding part and the second bonding part are respectively arranged on the positive pole piece and the negative pole piece, the connection between the positive pole piece and the negative pole piece and the diaphragm is realized by arranging the adhesive on the first bonding part and the second bonding part, the semi-finished product battery core is formed, and the adhesive is coated on one side of the first bonding part and the second bonding part, which is opposite to the coating surface, so that the semi-finished product battery core can be fixed on the coating layer.
Further, one side of the dressing refers to the side of the pole piece coated with the active material, and the first bonding part and the second bonding part are respectively arranged on the upper side of the active material.
Further, the bonding part is arranged along the length direction of the pole piece, preferably, the length of the bonding part is the same as that of the corresponding pole piece, the area of the adhesive coated on each side of the first bonding part is 50% -100% of the area of the side of the first bonding part, and the area of the adhesive coated on each side of the second bonding part is 50% -100% of the area of the side of the second bonding part.
Furthermore, the coating layer is a piece and is coated on the outer sides of the positive and negative pole pieces in a folding mode.
Further, the adhesive is PVA fixed glue, and the PVA fixed glue is a polyvinyl alcohol material.
It should be noted that the positioning order of the positive and negative pole pieces can be changed.
Drawings
FIG. 1 is a schematic view of a structure of a negative electrode sheet and a schematic view of a combination of the negative electrode sheet and a separator according to an embodiment
FIG. 2 is a schematic view of the structure of a positive plate according to an embodiment
FIG. 3 is a schematic diagram of the combination of the positive plate, the negative plate and the separator in the embodiment
FIG. 4 is a schematic view showing a coating layer according to an embodiment
FIG. 5 is a schematic diagram of the positive and negative surfaces of the second negative electrode plate of the embodiment
FIG. 6 is a schematic view of the positive and negative surfaces of the second positive electrode plate according to the embodiment
FIG. 7 is a schematic view of an exemplary process for positioning two diodes
FIG. 8 is a schematic diagram of the structure of the third negative electrode plate and the matching between the third negative electrode plate and the separator in the embodiment
FIG. 9 is a schematic view of the structure of the three positive electrode sheets of the embodiment
FIG. 10 is a schematic diagram of the combination of three positive and negative plates and a separator in the example
FIG. 11 is a schematic view showing a case of coating three layers according to an embodiment
Detailed Description
The following describes embodiments of the present invention with reference to the drawings.
The first embodiment is as follows:
referring to fig. 1 to 4, the present embodiment provides a pole piece assembly positioning method for a thin lithium ion battery, the related lithium ion battery includes a coating layer 3, a positive pole piece 2, a negative pole piece 1 and a diaphragm 4 arranged between the positive and negative pole pieces, the upper end of the negative pole piece 1 is provided with a first bonding portion 11, the upper end of the positive pole piece 2 is correspondingly provided with a second bonding portion 21, the upper side of the first bonding portion 11 is connected with a negative pole tab 12, the upper side of the second bonding portion 21 is connected with a positive pole tab 22, the coating layer 3 is preferably an aluminum-plastic film, and the assembly positioning method includes the following steps.
Referring to fig. 1 to 4, a first double-sided adhesive layer 51 is first provided on the first adhesive portion 11, the separator 4 is adhered to the negative electrode sheet 1 through the first double-sided adhesive layer 51, a second double-sided adhesive layer 52 is provided on the second adhesive portion 21, the positive electrode sheet 2 is stacked on the separator 4, and the positive electrode sheet 2 is adhered to the separator 4 through the second double-sided adhesive layer 52, the first double-sided adhesive layer 51 and the second double-sided adhesive layer 52 each extending to the outside of the separator 4 and the positive and negative electrode sheets to form an exposed adhesive region 50, thereby presetting a position for adhering the clad layer 3. Then, the coating layer 3 is coated on the outer sides of the positive and negative electrode plates, and the exposed adhesive area of the first double-sided adhesive layer 51 and the second double-sided adhesive layer 52 is positioned on the outer sides of the positive and negative electrode plates, and finally edge sealing treatment is carried out.
The coating layer 3 is a sheet, and is coated on the outer sides of the positive and negative electrode sheets in a folded manner, of course, the positioning order of the positive and negative electrode sheets can be changed according to actual requirements, the first double-sided adhesive layer 51 and the second double-sided adhesive layer 52 are preferably double-sided PI adhesives in the prior art, and the PI adhesives are polyimide materials.
Referring to fig. 1 and 2, as a preferable scheme, the first double-sided adhesive layer 51 is arranged on the side of the first adhesive part 11 coated with the negative electrode sheet 1, the second double-sided adhesive layer 52 is arranged on the side of the second adhesive part 21 coated with the positive electrode sheet 2, and the separator 4 is arranged between the coated surfaces of the positive and negative electrode sheets. The one side of the dressing is the side of the pole piece coated with the active material 100, and the first bonding part 11 and the second bonding part 21 are respectively arranged on the upper side of the active material 100. The arrangement mode strengthens the connection between the diaphragm 4 and the pole piece, prevents the risks of deviation, loosening and the like of the diaphragm 4, and can further protect the active substance 100 on the pole piece.
Referring to fig. 3, the first double-sided adhesive layer 51 has one end disposed inside the negative electrode tab 12 and the other end extending along the side of the positive electrode tab 22, and has a length terminating inside the positive electrode tab 22, and the second double-sided adhesive layer 52 has the other end extending along the side of the negative electrode tab 12 and has a length terminating inside the negative electrode tab 12. In order to ensure the connection stability, the length of the first double-sided adhesive layer 51 is 40% -50% of the tab spacing, and the length of the second double-sided adhesive layer 52 is 40% -50% of the tab spacing, preferably, in order to effectively control the thickness of the battery, the lengths of the first double-sided adhesive layer 51 and the second double-sided adhesive layer 52 are set to be not overlapped with each other, and it should be noted that the tab spacing in the present invention refers to the distance between the positive electrode tab 22 and the negative electrode tab 12.
The height of the exposed adhesive area of the first double-sided adhesive layer 51 and the second double-sided adhesive layer 52 is at least 0.3-0.5mm, so that the connection stability between the cladding layer 3 and the pole piece is ensured.
Compared with the prior art, the pole piece assembling and positioning method provided by the invention has the advantages that the first bonding part 11 and the second bonding part 21 are respectively arranged on the positive pole piece and the negative pole piece, the connection between the positive pole piece and the negative pole piece and the diaphragm 4 is realized by arranging the double-sided bonding layer on the first bonding part 11 and the second bonding part 21, the semi-finished product battery cell is formed, the preset adhesion area 50 formed by the part of the double-sided bonding layer extending out of the positive pole piece, the negative pole piece and the diaphragm 4 is utilized, the semi-finished product battery cell can be fixed on the coating layer 3 through the adhesion area 50, the positioning mode of the pole piece not only abandons the mode of positioning the pole piece by arranging a pit on the coating layer 3 in the prior art, overcomes the defects in the prior art, but also enables the pole piece, the diaphragm 4 and the coating layer 3 to be relatively and firmly fixed together, and avoids the risk of, meanwhile, the double-sided adhesive layer is arranged on the preset adhesive part of the pole piece instead of the active material 100 of the pole piece, so that the chemical property of the battery cell is prevented from being damaged by impurities to the maximum extent.
Example two:
referring to fig. 5 to 7, compared with the first embodiment, the present embodiment provides another method for assembling and positioning the pole pieces of the thin lithium ion battery, which relates to a lithium ion battery including a coating layer 3, a positive pole piece 2, a negative pole piece 1, and a separator 4 disposed between the positive and negative pole pieces, one side of the negative plate 1 is provided with a first bonding part 11, one side of the positive plate 2 is provided with a second bonding part 21, the first bonding part 11 is provided with a negative electrode tab 12, the width of the first bonding part 11 is larger than that of the negative electrode tab 12, the second bonding part 21 is provided with a positive tab 22, the width of the second bonding part 21 is larger than that of the positive tab 22, as a specific implementation mode, the first bonding part 11 is 1-3mm wider than the negative tab 12, and the second bonding part 21 is 1-3mm wider than the positive tab 22, and the assembling and positioning method comprises the following steps.
Referring to fig. 5 to 7, first, a double-sided adhesive layer 54 is provided on the upper side of the clad layer 3, the first adhesive part 11 is adhered to the double-sided adhesive layer 54, wherein the length of the double-sided adhesive layer 54 is greater than the width of the first adhesive part 11 and the second adhesive part 21, the negative electrode sheet 1 is positioned on the clad layer 3 through the double-sided adhesive layer 54, the separator 4 is stacked on the negative electrode sheet 1 and adhered to the double-sided adhesive layer 54, the double-sided adhesive layer 54 reserves an adhesion area for adhering the second adhesive part 21 and the clad layer 3 outside the separator 4, the positive electrode sheet 2 is stacked on the upper side of the separator 4, and the second adhesive part 21 is adhered to the double-sided adhesive layer 54, thereby fixing the positive electrode sheet 2, the clad layer 3 is clad on the outside of the electrode sheet, the positive and negative electrode sheets 3 are positioned outside the electrode sheets (1,2) through the adhesion area exposed from the double-sided adhesive layer 54, and finally, performing edge sealing treatment.
The coating layer 3 is a piece, and is coated on the outer side of the positive plate 2 in a folding manner, it should be noted that the positioning sequence of the positive plate and the negative plate can be changed, and if the positive plate 2 is positioned first, the coating layer 3 is folded in half and then coated on the outer side of the negative plate 1. The first double-sided adhesive layer 5451 and the second double-sided adhesive layer 5452 are preferably double-sided PI adhesives in the prior art, and the PI adhesives are polyimide materials.
Referring to fig. 5 and 6, the active material 100 is coated on one side of the coating surfaces of the positive and negative electrode plates, and the first adhesive part 11 and the second adhesive part 21 are respectively arranged on the upper side of the active material 100, so that the double-sided adhesive layer 54 is ensured not to contact with the active material 100 as much as possible, and the chemical properties of the double-sided adhesive layer are not affected.
In a specific embodiment, the height of the first bonding part 11 and the second bonding part 21 is 3-5mm, the length of the double-sided bonding layer 54 is greater than or equal to that of the pole piece, and the height of the double-sided bonding layer is greater than or equal to that of the first bonding part 11 and the second bonding part 21; the length and the width of the diaphragm 4 are both 1-2mm larger than those of the positive and negative pole pieces, so that the influence of the overlarge diaphragm 4 on the adhesion of the positive pole piece 2 and the coating layer 3 is avoided.
Compared with the prior art, the pole piece assembling and positioning method provided by the invention has the advantages that the double-sided adhesive layer 54 is arranged on the coating layer 3, the positive and negative pole pieces are fixed by the first adhesive part 11 and the second adhesive part 12, the positioning of the positive and negative pole pieces and the diaphragm 4 and the coating of the coating layer 3 are completed by only one double-sided adhesive layer 54, the working procedures are simple and quick, the material cost is low, the method not only discards the mode of arranging pits on the coating layer 3 to realize the positioning of the pole pieces in the prior art, but also overcomes the defects in the prior art, the pole pieces, the diaphragm 4 and the coating layer 3 are relatively and firmly fixed together, and the risk that the pole pieces and the diaphragm 4 are deviated and even fall off during subsequent work is avoided.
Example three:
referring to fig. 8 to 11, compared with the first embodiment and the second embodiment, the present embodiment provides another method for assembling and positioning a pole piece of a thin lithium ion battery, the lithium ion battery includes a coating layer 3, a positive pole piece 2, a negative pole piece 1, and a diaphragm 4 disposed between the positive pole piece and the negative pole piece, the upper end of the negative pole piece 1 is provided with a first bonding portion 11, the upper end of the positive pole piece 2 is provided with a second bonding portion 21, the upper side of the first bonding portion 11 is connected with a negative pole tab 12, and the upper side of the second bonding portion 21 is connected with a positive pole tab 22, and the method for assembling and positioning includes the following steps.
Referring to fig. 8 to 11, first, an adhesive 53 is applied to the first bonding portion 11 on the side of the negative electrode sheet 1 dressing, the separator 4 is adhered to the negative electrode sheet 1 by the adhesive 53 on the first bonding portion 11, an adhesive 53 is applied to the second bonding portion 21 on the side of the positive electrode sheet 2 dressing, the positive electrode sheet 2 is adhered to the separator 4 by the adhesive 53 on the second bonding portion 21, the adhesive 53 is applied to the first bonding portion 11 and the second bonding portion 21 on the sides opposite to the dressing surfaces, the coating layer 3 is coated on the outer sides of the positive and negative electrode sheets, the coating layer is positioned on the outer sides of the positive and negative electrode sheets by the adhesive 53 on the sides, and finally, edge sealing treatment is performed.
The coating layer 3 is a piece and is coated on the outer sides of the positive and negative pole pieces in a folding mode, and it needs to be noted that the positioning sequence of the positive and negative pole pieces can be changed according to actual requirements. The adhesive 53 is preferably PVA fixing glue, which is a polyvinyl alcohol material.
Referring to fig. 8 and 9, the side of the dressing refers to the side of the pole piece coated with the active material 100, and the first adhesive part 11 and the second adhesive part 21 are respectively arranged on the upper side of the active material 100.
Referring to fig. 8 and 9, the bonding portions are arranged along the length direction of the pole piece, preferably, the length of the bonding portion is the same as the length of the corresponding pole piece, the area of the adhesive 53 coated on each side of the first bonding portion 11 is 50% -100% of the area of the side of the first bonding portion 11, and the area of the adhesive 53 coated on each side of the second bonding portion 21 is 50% -100% of the area of the side of the second bonding portion 21, so as to further improve the connection stability.
Compared with the prior art, the pole piece assembling and positioning method provided by the invention is characterized in that the first bonding part 11 and the second bonding part 21 are respectively arranged on the positive pole piece and the negative pole piece, the connection between the positive pole piece and the negative pole piece and the diaphragm 4 is realized by arranging the adhesive 53 on the first bonding part 11 and the second bonding part 21, a semi-finished product battery core is formed, and the adhesive 53 is coated on one side of the first bonding part 11 and the second bonding part 21, which is opposite to the coating surface, so that the semi-finished product battery core can be fixed on the coating layer 3, the positioning mode of the pole pieces not only abandons the mode of arranging pits on the coating layer 3 to realize the positioning of the pole pieces in the prior art, overcomes the defects in the prior art, but also enables the pole pieces, the diaphragm 4 and the coating layer 3 to be relatively and firmly fixed together, avoids the risk of deviation and even falling off when the pole pieces and the diaphragm 4 are in subsequent work, and simultaneously, because, rather than on the active material 100 of the pole piece, to avoid impurities to destroy the chemistry of the cell to the maximum extent.
Variations and modifications to the above-described embodiments may occur to those skilled in the art, which fall within the scope and spirit of the above description. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and variations of the present invention should fall within the scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (13)
1. The pole piece assembling and positioning method of the thin lithium ion battery comprises a coating layer, a positive pole piece, a negative pole piece and a diaphragm arranged between the positive pole piece and the negative pole piece, and is characterized in that: one side of the negative plate is provided with a first bonding part, and the corresponding side of the positive plate is provided with a second bonding part, and the assembling and positioning method comprises the following steps:
arranging a first double-sided adhesive layer on the first adhesive part, and adhering the diaphragm on the negative plate through the first double-sided adhesive layer, wherein the first double-sided adhesive layer extends to the outer sides of the diaphragm and the negative plate to form an exposed adhesive area;
a second double-sided adhesive layer is arranged on the second adhesive part, the positive plate is adhered to the diaphragm through the second double-sided adhesive layer, and the second double-sided adhesive layer extends to the outer sides of the diaphragm and the positive plate to form an exposed adhesive area;
the coating layers are coated on the outer sides of the positive and negative pole pieces, and are positioned on the outer sides of the positive and negative pole pieces through the exposed adhesive areas of the first double-sided adhesive layer and the second double-sided adhesive layer.
2. The fitting positioning method according to claim 1, characterized in that: the first double-sided adhesive layer is arranged on one side, located on the negative plate dressing, of the first adhesive part, the second double-sided adhesive layer is arranged on one side, located on the positive plate dressing, of the second adhesive part, and the diaphragm is arranged between the dressing surfaces of the positive and negative plates.
3. The fitting positioning method according to claim 1, characterized in that: the first bonding part is provided with a negative electrode lug, the second bonding part is provided with a positive electrode lug, one end of the first double-sided bonding layer is arranged on the inner side of the negative electrode lug, the other end of the first double-sided bonding layer extends along one side of the positive electrode lug, and the length of the first double-sided bonding layer is limited to the inner side of the positive electrode lug; the second double-sided adhesive layer is arranged on the inner side of the positive electrode tab, the other end of the second double-sided adhesive layer extends along one side of the negative electrode tab, and the length of the second double-sided adhesive layer is limited on the inner side of the negative electrode tab.
4. The fitting positioning method according to claim 3, characterized in that: the length of the first double-sided bonding layer is 40% -50% of the distance between the lugs, and the length of the second double-sided bonding layer is 40% -50% of the distance between the lugs.
5. The fitting positioning method according to claim 3, characterized in that: the lengths of the first and second double-sided adhesive layers are set so as not to overlap each other.
6. The fitting positioning method according to claim 1, characterized in that: the height of the exposed adhesive area of the first double-sided adhesive layer and the second double-sided adhesive layer is at least 0.3-0.5 mm.
7. The fitting positioning method according to any one of claims 1 to 6, characterized in that: the coating layer is a piece and is coated on the outer sides of the positive and negative pole pieces in a folding mode.
8. The pole piece assembling and positioning method of the thin lithium ion battery comprises a coating layer, a positive pole piece, a negative pole piece and a diaphragm arranged between the positive pole piece and the negative pole piece, and is characterized in that: one side of the negative plate is provided with a first bonding part, one side of the positive plate is provided with a second bonding part, the first bonding part is provided with a negative electrode tab, the width of the first bonding part is greater than the width of the negative electrode tab, the second bonding part is provided with a positive electrode tab, the width of the second bonding part is greater than the width of the positive electrode tab, and the assembly positioning method comprises the following steps:
a double-sided adhesive layer is arranged on one side of the coating layer, the first adhesive part is adhered to the double-sided adhesive layer, the length of the double-sided adhesive layer is greater than the width of the first adhesive part and the second adhesive part, the negative plate is positioned on the coating layer through the double-sided adhesive layer,
adhering the diaphragm to the double-sided adhesive layer, and reserving an adhesion area for adhering the second adhesion part and the coating layer on the outer side of the diaphragm by the double-sided adhesive layer;
adhering the second adhesive part on the double-sided adhesive layer;
the coating layers are coated on the outer sides of the positive and negative pole pieces, and the coating layers are positioned on the outer sides of the positive and negative pole pieces through the exposed adhesive areas of the double-sided adhesive layers.
9. The fitting positioning method according to claim 8, characterized in that: the height of the first bonding part and the height of the second bonding part are 3-5mm, the length of the double-sided bonding layer is larger than or equal to that of the pole piece, and the height of the double-sided bonding layer is larger than or equal to that of the first bonding part and the second bonding part.
10. The fitting positioning method according to claim 8 or 9, characterized in that: the coating layer is a piece and is coated on the outer side of the positive plate in a folding mode.
11. The pole piece assembling and positioning method of the thin lithium ion battery comprises a coating layer, a positive pole piece, a negative pole piece and a diaphragm arranged between the positive pole piece and the negative pole piece, and is characterized in that: one side of the negative plate is provided with a first bonding part, one side of the positive plate is provided with a second bonding part, and the assembling and positioning method comprises the following steps:
coating an adhesive on one side of the first bonding part, which is positioned on the negative electrode sheet dressing, and adhering the diaphragm on the negative electrode sheet through the adhesive on the first bonding part;
coating an adhesive on one side of the second bonding part, which is positioned on the positive plate dressing, and bonding the positive plate on the diaphragm through the adhesive on the second bonding part;
and coating adhesives on the sides of the first bonding part and the second bonding part, which are opposite to the dressing surface, respectively, coating the coating layers on the outer sides of the positive and negative pole pieces, and positioning the coating layers on the outer sides of the positive and negative pole pieces through the adhesives on the sides.
12. The fitting positioning method according to claim 11, wherein: the area of the adhesive coated on each side of the first bonding part is 50% -100% of the area of the side of the first bonding part, and the area of the adhesive coated on each side of the second bonding part is 50% -100% of the area of the side of the second bonding part.
13. The fitting positioning method according to claim 11 or 12, characterized in that: the coating layer is a piece and is coated on the outer sides of the positive and negative pole pieces in a folding mode.
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| CN110931885A (en) * | 2019-12-03 | 2020-03-27 | 广州丰江电池新技术股份有限公司 | Preparation method of battery core of thin lithium ion battery, and battery core and battery applying same |
| CN114552130A (en) * | 2021-09-13 | 2022-05-27 | 万向一二三股份公司 | Pole piece structure for improving lithium ion battery thermal compounding process infiltration |
| CN114864859A (en) * | 2022-05-12 | 2022-08-05 | 浙江极氪智能科技有限公司 | Battery pole piece, battery core and battery |
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| JP4186260B2 (en) * | 1998-08-10 | 2008-11-26 | ソニー株式会社 | Thin battery |
| FI20095728A0 (en) * | 2009-06-26 | 2009-06-26 | Enfucell Ltd | Procedure for manufacturing thin batteries |
| CN203850371U (en) * | 2014-04-03 | 2014-09-24 | 惠州市恒晔科技有限公司 | Micro polymer lithium ion square battery |
| CN204614860U (en) * | 2015-05-13 | 2015-09-02 | 深圳市博亿能科技有限公司 | A kind of battery pole piece and ultra-thin flexible-packed battery |
| KR102265230B1 (en) * | 2017-04-18 | 2021-06-16 | (주)엘지에너지솔루션 | Electrode Assembly Improved Thermal Safety by Binder Coating Layer |
| CN208580814U (en) * | 2018-04-15 | 2019-03-05 | 郭玲玲 | A kind of New insulated battery thin film |
| CN208111561U (en) * | 2018-04-28 | 2018-11-16 | 广州丰江电池新技术股份有限公司 | A kind of thin lithium ion battery |
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