CN217405513U - Winding type battery cell - Google Patents
Winding type battery cell Download PDFInfo
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- CN217405513U CN217405513U CN202220293625.1U CN202220293625U CN217405513U CN 217405513 U CN217405513 U CN 217405513U CN 202220293625 U CN202220293625 U CN 202220293625U CN 217405513 U CN217405513 U CN 217405513U
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- adhesive tape
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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
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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
Abstract
The utility model provides a coiling type electricity core, coiling type electricity core includes naked electric core and ending adhesive tape, ending adhesive tape coiling cladding in the at least round in the side of standing of naked electric core is followed the axial of naked electric core, ending adhesive tape's axial length does the 80% ~ 90% of the axial length of naked electric core. The utility model discloses a standing the end adhesive tape of the complete at least round of cladding in side at naked electric core, having injectd the axial length of end adhesive tape simultaneously, successfully improved the extrusion security performance of coiling type electric core.
Description
Technical Field
The utility model belongs to the technical field of electric core structure, a coiling type electricity core is related to.
Background
At present, the applications of lithium ion batteries in consumer electronics mainly include mobile phones, personal computers, tablet computers, mobile power sources, smart wearable watches, electronic cigarettes, and the like, and account for 58% of the total demand of lithium ion batteries. With the increasing requirements of digital 3C and intelligent wearing on energy density and thin battery cells, the safety performance of lithium ion batteries is receiving more and more attention.
In the extrusion test process, at first can take place the deformation and the displacement of electrode, along with the increase of deformation degree, and then lead to the mass flow body to take place to slide, at last the diaphragm because deformation degree is too big, lead to the diaphragm to break and become invalid, arouse that the large tracts of land short circuit takes place, in case the internal short circuit takes place, then lead to the battery thermal runaway to burn out the battery. The existing methods for improving the extrusion performance of the lithium ion battery mainly focus on the selection of base materials (foils, diaphragms, gummed papers and the like), the coating of ceramics on the surface of a pole piece, the improvement of the content of a binder and the like, and have various advantages and disadvantages, and the methods can change the energy density, the capacity, the dynamic performance and the storage performance of a battery core. The thickness of the conventional adhesive tape of the model is only 16 mu m, and the battery core cannot bear the acting force during the extrusion test, so the test cannot pass.
CN209312888U discloses a battery roll core structure, including positive pole piece and negative pole piece, the positive pole piece head reserves empty paper tinsel, the positive pole piece welds in empty paper tinsel position department, the negative pole piece head reserves empty paper tinsel, the negative pole piece welds in empty paper tinsel position department, positive pole piece welding position department pastes outward first high temperature adhesive tape, paste outward in negative pole piece welding position department second high temperature adhesive tape, first high temperature adhesive tape and second high temperature adhesive tape upper and lower both ends extend the battery roll core inside and paste in rolling up the core vertical side, first high temperature adhesive tape and second high temperature adhesive tape upper and lower extreme all bond and have the termination sticky tape, the termination sticky tape encircles a circle of rolling up core vertical side, roll core is formed through coiling according to the stack order of diaphragm, negative pole piece, diaphragm, positive pole piece, provide a kind of high quality, convenient to produce, the battery roll core structure of lower cost. But the crush performance of the battery in the cell structure is poor.
CN201210051135 discloses an lithium ion battery using a special shape, which comprises a positive plate, a negative plate, a diaphragm and an encapsulation film, wherein the positive plate, the negative plate and the diaphragm are provided with corresponding punched holes, after a battery core is manufactured by winding or lamination process, the centers of the punched holes on the positive plate, the negative plate and the diaphragm are all located on a straight line, a communicated gap is formed, and an electrolyte absorption channel is added; in the scheme, the energy density of the lithium ion battery can be reduced by the notch in the middle of the battery core, and particularly for thicker batteries, the more the number of layers of the thick battery is, the more the capacity is reduced by punching; for the thin battery, the deformation resistance of the whole structure of the battery is relatively weakened due to the notch of the battery core, and the safety performances of the battery, such as heavy impact, falling, extrusion and the like, are reduced.
Therefore, how to adjust the structure of the winding type battery cell to improve the extrusion pass rate and the safety performance of the battery is an urgent technical problem to be solved.
SUMMERY OF THE UTILITY MODEL
Not enough to prior art exists, the utility model aims to provide a coiling type electricity core. The utility model discloses a standing the end adhesive tape of the complete at least round of cladding in side at naked electric core, having injectd the axial length of end adhesive tape simultaneously, successfully improved the extrusion security performance of coiling type electric core.
To achieve the purpose, the utility model adopts the following technical proposal:
in a first aspect, the utility model provides a coiling type electricity core, coiling type electricity core includes naked electric core and ending adhesive tape, ending adhesive tape coiling cladding in the at least round in the side of standing of naked electric core is followed the axial of naked electric core, ending adhesive tape's axial length does the axial length's of naked electric core 80% ~ 90%, for example 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89% or 90% etc..
The utility model discloses an end adhesive tape of the complete cladding of side at least round stands at naked electric core has injectd the axial length of end adhesive tape simultaneously, has successfully improved the extrusion security performance of coiling formula electric core.
As a preferred technical solution of the present invention, the bare cell includes a positive electrode plate, a negative electrode plate and a diaphragm, and the bare cell is formed by winding the diaphragm, the negative electrode plate, the diaphragm and the positive electrode plate in the stacking order; the diaphragm comprises a base film, a ceramic layer and a PVDF glue layer which are sequentially stacked.
As a preferred technical scheme of the utility model, the thickness of base film is 5 μm, the thickness of ceramic layer is 2 μm, the thickness of PVDF glue film is 1 μm.
The utility model discloses in, diaphragm under the above-mentioned condition has bigger elongation at break and tensile strength.
As the utility model discloses a preferred technical scheme, positive pole piece includes the empty paper tinsel district of first empty paper tinsel district, anodal active area and second, the empty paper tinsel district department of first empty sets up anodal utmost point ear, and the welding position in anodal utmost point ear and the empty paper tinsel district of first empty sets up first toe glue, and the empty paper tinsel district of second sets up with anodal active area handing-over department and ends to scribble high temperature adhesive tape.
The utility model discloses in, first weld toe glue in the positive pole piece and only scribble high temperature adhesive tape and be two-sided setting.
As the utility model discloses a preferred technical scheme, the negative pole piece includes the empty paper tinsel district of third, negative pole active area and the empty paper tinsel district of fourth, and the empty paper tinsel district department of third sets up negative pole utmost point ear, and the welding position in the empty paper tinsel district of negative pole utmost point ear and third sets up the second and welds the toe and glue.
As a preferred technical scheme of the utility model, anodal utmost point ear and negative pole utmost point ear are located the homonymy of coiling formula electricity core.
As an optimal technical scheme of the utility model, the thickness of ending adhesive tape is 27 ~ 33 mu m, the length of the coiling of ending adhesive tape is 50 ~ 60mm, the width of ending adhesive tape is 15 ~ 21 mm.
The utility model discloses in, the width of ending adhesive tape that provides is for the length along the axis direction of electric core side of founding, and the length of the coiling of ending adhesive tape carries out the length of cladding for ending adhesive tape along the direction of the coiling of naked electric core.
For example, the thickness of the tail adhesive tape may be 27 μm, 27.5 μm, 28 μm, 28.5 μm, 29 μm, 29.5 μm, 30 μm, 30.5 μm, 31 μm, 31.5 μm, 32 μm, 32.5 μm, or 33 μm, but is not limited to the above-mentioned values, and other values not listed in the above-mentioned value range are also applicable;
the length of the winding of the ending gummed paper is 50mm, 51mm, 52mm, 53mm, 54mm, 55mm, 56mm, 57mm, 58mm, 59mm or 60mm, etc., but is not limited to the enumerated values, and other non-enumerated values in the numerical range are also applicable;
the width of the final adhesive tape may be 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, etc., but is not limited to the recited values, and other values not recited in the range of the values are also applicable.
The utility model discloses an increase the width and the thickness of ending adhesive tape, improved the extrusion security performance of coiling formula electricity core more effectively.
The utility model discloses in, to thickness, the coiling length and the width further restriction of ending the adhesive tape, can both guarantee to end better that the whole core is rolled up to the naked core of complete cladding is glued, guarantee again that naked core whole thickness is not super thick to successfully improve the extrusion security performance of coiling formula electric core.
As a preferred technical scheme of the utility model, the thickness of ending adhesive tape is 30 mu m, and the length of the coiling of ending adhesive tape is 55mm, and the width of ending adhesive tape is 18 mm.
As a preferred technical scheme of the utility model, the mass flow body in the positive pole piece is the aluminium foil mass flow body, the tensile strength of aluminium foil mass flow body is more than or equal to 250N/mm 2 For example, the tensile strength may be 250N/mm 2 、260N/mm 2 、270N/mm 2 、280N/mm 2 、290N/mm 2 、300N/mm 2 、310N/mm 2 、320N/mm 2 、330N/mm 2 、350N/mm 2 Or 400N/mm 2 And the like, but not limited to the recited values, and other values not recited within the numerical range are also applicable, and the elongation at break is not less than 3%, for example, the elongation at break may be 3%, 4%, 5%, 6%, 7%, 8%, 9%, or 10%, but not limited to the recited values, and other values not recited within the numerical range are also applicable.
The utility model discloses in, the fracture elongation percentage and the tensile strength of aluminium foil mass flow body are in above-mentioned within range, and intensity is higher, more is favorable to guaranteeing when carrying out the extrusion test, and the aluminium foil mass flow body is difficult to take place displacement deformation and damaged fracture even and cause short circuit in the electric core, leads to the extrusion test inefficacy to successfully improve the extrusion security performance of coiling formula electric core.
In a preferred embodiment of the present invention, the thicknesses of the first and second weld toe are 27 to 33 μm, for example, 27 μm, 27.5 μm, 28 μm, 28.5 μm, 29 μm, 29.5 μm, 30 μm, 30.5 μm, 31 μm, 31.5 μm, 32 μm, 32.5 μm, or 33 μm, respectively, but the thicknesses are not limited to the values listed, and other values not listed in the numerical range are also applicable.
As a preferred technical scheme of the utility model, the thickness of first toe glue and second toe glue is 30 mu m.
In a preferred embodiment of the present invention, the thickness of the stop-coated high temperature adhesive paper is 27 to 33 μm, for example, 27 μm, 27.5 μm, 28 μm, 28.5 μm, 29 μm, 29.5 μm, 30 μm, 30.5 μm, 31 μm, 31.5 μm, 32 μm, 32.5 μm, or 33 μm, but the thickness is not limited to the above-mentioned values, and other values not listed in the above-mentioned value range are also applicable.
As a preferred technical scheme of the utility model, the thickness of only scribbling high temperature adhesive tape is 30 μm.
The utility model discloses in, inject the thickness that only scribbles high temperature adhesive tape and weld the toe and glue the subsides to and positive and negative pole piece corresponds position department, can more be favorable to guaranteeing when carrying out the extrusion test, the positive and negative pole piece of the better protection of high temperature adhesive tape is difficult to take place displacement deformation and damage fracture even and cause short circuit in the electric core, leads to the extrusion test inefficacy, thereby successfully improves the extrusion security performance of coiling formula electric core.
The first weld toe glue, the second weld toe glue and the stop-coating high-temperature gummed paper are double-sided gummed paper
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model discloses a standing the ending adhesive tape of the complete at least round of cladding in side at naked electric core, high temperature adhesive tape and welding toe glue are only scribbled in collocation and correspond position department in positive and negative pole piece, increase ending adhesive tape simultaneously, only scribble the thickness that high temperature adhesive tape and welding toe glue, the diaphragm and the anodal mass flow body of high strength are assisted again, the extrusion security performance of coiling formula electricity core has successfully been improved, under the circumstances that the test of guaranteeing electric core extrusion passes through, other electrical property homoenergetic of electricity core can satisfy technical requirement, not influenced.
Drawings
Fig. 1 is a front view of a winding type battery cell provided in an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a positive electrode plate according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a negative electrode plate according to an embodiment of the present invention.
Fig. 4 is a front view of a wound cell provided in comparative example 1 of the present invention.
The battery comprises 1-ending adhesive tape, 2-bare cell, 3-anode tab, 4-first empty foil area, 5-first weld toe glue, 6-anode active area, 7-second empty foil area, 8-coating-stop high-temperature adhesive tape, 9-cathode tab, 10-third empty foil area, 11-second weld toe glue, 12-cathode active area and 13-fourth empty foil area.
Detailed Description
It is to be understood that in the description of the present invention, the terms "central," "longitudinal," "lateral," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings only for the convenience of description and simplicity of description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
It should be noted that, unless explicitly stated or limited otherwise, the terms "disposed," "connected" and "connected" in the description of the present invention are to be construed broadly, and may for example be fixedly connected, detachably connected or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
It should be understood by those skilled in the art that the present invention inevitably includes necessary pipelines, conventional valves and general pump devices for realizing the complete process, but the above contents do not belong to the main invention point of the present invention, and those skilled in the art can select types based on the process flow and the device structure to automatically add the layout, and the present invention does not have special requirements and specific limitations for the above.
The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.
In a specific embodiment, the utility model provides a coiling type electricity core, as shown in fig. 1, coiling type electricity core includes naked electric core 2 and ending adhesive tape 1, and ending adhesive tape 1 coils cladding in the upright side at least round of naked electric core 2, along the axial of naked electric core 2, and ending adhesive tape 1's axial length is 80% ~ 90% of naked electric core 2's axial length.
Through ending the adhesive tape 1 of the complete cladding of at least round in naked electric core 2 founds side, limited ending the axial length of adhesive tape 1 simultaneously, successfully improved the extrusion security performance of coiling formula electric core.
The bare cell 2 comprises a positive pole piece, a negative pole piece and a diaphragm, and the bare cell 2 is formed by winding the diaphragm, the negative pole piece, the diaphragm and the positive pole piece in the stacking sequence; the diaphragm comprises a base film, a ceramic layer and a PVDF glue layer which are sequentially stacked.
As shown in fig. 2, the positive electrode plate includes a first empty foil area 2, a positive active area 3 and a second empty foil area 7, the first empty foil area 4 is provided with a positive electrode tab 3, the welding position of the positive electrode tab 3 and the first empty foil area 4 is provided with a first weld toe glue 5, the front and back surfaces of the positive electrode plate are provided with the first weld toe glue 5, the joint of the second empty foil area 7 and the positive active area 6 is provided with a high temperature glue coating paper 8, and the front and back surfaces of the positive electrode plate are provided with the high temperature glue coating paper 8.
As shown in fig. 3, the negative electrode plate includes a third empty foil area 10, a negative active area 12 and a fourth empty foil area 13, a negative electrode tab 9 is disposed at the third empty foil area 10, and a second toe glue 11 is disposed at a welding position of the negative electrode tab 9 and the third empty foil area 10.
The positive electrode tab 3 and the negative electrode tab 9 are positioned on the same side of the winding type battery cell.
The thickness of the ending gummed paper 1 is 27-33 μm, the winding length of the ending gummed paper 1 is 50-60 mm, and the width of the ending gummed paper 1 is 15-21 mm.
The thickness, the winding length and the width of the ending adhesive paper 1 are further limited, the ending adhesive can be better ensured to completely wrap the naked winding core for a whole circle, and the whole thickness of the naked winding core is ensured not to be over-thick, so that the extrusion safety performance of the winding type battery cell is successfully improved.
The width of ending adhesive tape 1 is for the length along the axis direction of the side is found to the electric core, and the length of the coiling of ending adhesive tape 1 carries out the length of cladding for ending adhesive tape 1 along the direction of the coiling of naked electric core 2.
The current collector in the positive pole piece is an aluminum foil current collector, and the tensile strength of the aluminum foil current collector is more than or equal to 250N/mm 2 The elongation at break is more than or equal to 3 percent.
The fracture elongation percentage and the tensile strength of the aluminum foil current collector are in the range, the strength is higher, the aluminum foil current collector is more favorable for ensuring that when the extrusion test is carried out, the aluminum foil current collector is not easy to generate displacement deformation or even breakage fracture to cause short circuit in the battery cell, so that the extrusion test fails, and the extrusion safety performance of the winding type battery cell is successfully improved.
The thicknesses of the first toe glue 5 and the second toe glue 11 are each independently 27 to 33 μm.
The thickness of the coating-stop high-temperature gummed paper 8 is 27-33 μm.
The thickness of the stop-coating high-temperature gummed paper 8 and the thickness of the welding toe stickers and the corresponding positions of the positive and negative plates are limited, so that the positive and negative plates are better protected by the high-temperature gummed paper, the positive and negative plates are not easy to displace, deform, even break and cause short circuit in the battery cell when extrusion testing is carried out, the extrusion testing is invalid, and the extrusion safety performance of the winding battery cell is successfully improved.
Example 1
The present embodiment provides a winding type battery cell, based on the battery cell provided in the foregoing specific embodiment:
wherein, along the axial direction of the naked electric core 2, the axial length of the ending gummed paper 1 is 90% of the axial length of the naked electric core 2, the thickness of the ending gummed paper 1 is 30 μm, the winding length of the ending gummed paper 1 is 55mm, and the width of the ending gummed paper 1 is 18 mm; the tensile strength of the aluminum foil is 280N/mm 2 The elongation at break is 5%; the thickness of the base film is 5 micrometers, the thickness of the ceramic layer is 2 micrometers, and the thickness of the PVDF glue layer is 1 micrometer; the thickness of the first weld toe glue 5 and the second weld toe glue 11 is 30 μm, and the thickness of the stop-coating high-temperature gummed paper 8 is 30 μm.
Example 2
The present embodiment provides a winding type battery cell, based on the battery cell provided in the foregoing specific embodiment:
wherein, along the axial of naked electric core 2, the axial length of ending adhesive tape 1 is 80% of the axial length of naked electric core 2, and the thickness of ending adhesive tape 1 is 27 mu m, and the length of the coiling of ending adhesive tape 1 is 50mm, and the width of ending adhesive tape 1 is 15 mm; the tensile strength of the aluminum foil is 250N/mm 2 Elongation at break of 3%; the thickness of the base film is 5 micrometers, the thickness of the ceramic layer is 2 micrometers, and the thickness of the PVDF glue layer is 1 micrometer; the thickness of the first weld toe glue 5 and the second weld toe glue 11 is 27 μm, and the thickness of the stop-coating high-temperature gummed paper 8 is 27 μm.
Example 3
The present embodiment provides a winding type battery cell, based on the battery cell provided in the foregoing specific embodiment:
wherein, along the axial direction of the naked electric core 2, the axial length of the ending gummed paper 1 is 85% of the axial length of the naked electric core 2, the thickness of the ending gummed paper 1 is 33 μm, the winding length of the ending gummed paper 1 is 60mm, and the width of the ending gummed paper 1 is 18 mm; the tensile strength of the aluminum foil is 300N/mm 2 The elongation at break is 8%; the thickness of the base film is 5 micrometers, the thickness of the ceramic layer is 2 micrometers, and the thickness of the PVDF glue layer is 1 micrometer; the thickness of the first weld toe 5 and the second weld toe 11 is 33 μm, and the thickness of the stop-coated high temperature adhesive tape 8 is 33 μm.
Example 4
This embodiment provides a coiling formula electric core, the electric core that provides based on above-mentioned embodiment:
wherein, the edgeThe axial of naked electric core 2, the axial length of ending adhesive tape 1 is 88% of the axial length of naked electric core 2, and the thickness of ending adhesive tape 1 is 29 mu m, and the length of the coiling of ending adhesive tape 1 is 58mm, and the width of ending adhesive tape 1 is 17 mm; the tensile strength of the aluminum foil is 260N/mm 2 The elongation at break is 4%; the thickness of the base film is 5 micrometers, the thickness of the ceramic layer is 2 micrometers, and the thickness of the PVDF glue layer is 1 micrometer; the thickness of the first weld toe glue 5 and the second weld toe glue 11 is 31 μm, and the thickness of the stop-coating high-temperature adhesive tape 8 is 32 μm.
Comparative example 1
The difference between this comparative example and example 1 is that, as shown in fig. 4, the ending adhesive tape 1 in this comparative example does not completely cover the vertical side surface of the winding core, the thickness of the ending adhesive tape 1 is 16 μm, the length of winding of the ending adhesive tape 1 is 20mm, and the width of the ending adhesive tape 1 is 15 mm.
The winding cells provided in examples 1 to 4 and comparative example 1 were subjected to a test of cell plane extrusion under conditions that a standard fully-chargeable cell was placed on a platform at an ambient temperature of 25 ± 3 ℃, a pressure of 13.0 ± 0.2KN was applied to the cell surface, and when the pressure reached a maximum value, the pressure was released to observe whether the cell ignited or exploded. The results are shown in Table 1.
TABLE 1
| Extrusion pass Rate (%) | |
| Example 1 | 100％ |
| Example 2 | 90％ |
| Example 3 | 95％ |
| Example 4 | 97％ |
| Comparative example 1 | 0％ |
From the data results of the example 1 and the comparative example 1, it can be known that the conventional end-closing adhesive tape only covers a part of the vertical side surface of the battery core, so that the battery core has weak pressure resistance, the battery core has internal short circuit, and the extrusion safety test fails by 100%.
To sum up, the utility model discloses a found the ending adhesive tape of the complete at least round of cladding in side at naked electric core, the collocation only scribbles high temperature adhesive tape and welds the toe and glue in positive and negative pole piece and correspond position department, increases ending adhesive tape simultaneously, only scribbles the thickness that high temperature adhesive tape and weld the toe and glue, is aided with the diaphragm and the anodal mass flow body of high strength again, has successfully improved the extrusion security performance of coiling formula electricity core, under the circumstances that the test of guaranteeing electric core extrusion passes through, other electrical property homoenergetic of electricity core can satisfy technical requirement, are not influenced.
The applicant states that the above description is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and those skilled in the art should understand that any changes or substitutions easily conceivable by those skilled in the art within the technical scope of the present invention are within the protection scope and the disclosure scope of the present invention.
Claims (10)
1. The utility model provides a coiling type electricity core, its characterized in that, coiling type electricity core includes naked electric core and ending adhesive tape, ending adhesive tape coiling cladding in the perpendicular side of naked electric core is the round at least, follows the axial of naked electric core, ending adhesive tape's axial length is 80% ~ 90% of naked electric core's axial length.
2. The winding type battery cell according to claim 1, wherein the bare cell comprises a positive electrode plate, a negative electrode plate and a diaphragm, and the bare cell is formed by winding the diaphragm, the negative electrode plate, the diaphragm and the positive electrode plate in the stacking sequence; the diaphragm comprises a base film, a ceramic layer and a PVDF glue layer which are sequentially stacked.
3. The wound battery cell according to claim 2, wherein the positive electrode sheet comprises a first empty foil area, a positive active area and a second empty foil area, a positive electrode tab is disposed at the first empty foil area, a first weld toe glue is disposed at a welding position of the positive electrode tab and the first empty foil area, and a high-temperature adhesive tape is disposed at a joint of the second empty foil area and the positive active area.
4. The wound electric core according to claim 3, wherein the negative electrode sheet includes a third empty foil area, a negative active area, and a fourth empty foil area, a negative electrode tab is disposed at the third empty foil area, and a second toe glue is disposed at a welding position of the negative electrode tab and the third empty foil area.
5. The wound cell of claim 4, wherein the positive and negative tabs are located on the same side of the wound cell.
6. The winding type battery cell according to claim 1, wherein the thickness of the end-closing adhesive tape is 27-33 μm, the length of the winding of the end-closing adhesive tape is 50-60 mm, and the width of the end-closing adhesive tape is 15-21 mm.
7. The wound cell of claim 3, wherein the current collector in the positive electrode sheet is an aluminum foil current collector, and the tensile strength of the aluminum foil current collector is greater than or equal to 250N/mm 2 The elongation at break is more than or equal to 3 percent.
8. The wound cell of claim 4, wherein the first and second weld toe adhesives each independently have a thickness of 27-33 μm.
9. The wound battery cell according to claim 3, wherein the thickness of the stop-coating high-temperature adhesive paper is 27-33 μm.
10. The wound-type cell of claim 4, wherein the first weld toe glue, the second weld toe glue and the stop-coating high-temperature adhesive tape are double-sided adhesive tapes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220293625.1U CN217405513U (en) | 2022-02-14 | 2022-02-14 | Winding type battery cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220293625.1U CN217405513U (en) | 2022-02-14 | 2022-02-14 | Winding type battery cell |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217405513U true CN217405513U (en) | 2022-09-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220293625.1U Active CN217405513U (en) | 2022-02-14 | 2022-02-14 | Winding type battery cell |
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|---|---|
| CN (1) | CN217405513U (en) |
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- 2022-02-14 CN CN202220293625.1U patent/CN217405513U/en active Active
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