CN220209010U - Pole piece, coil core with gradual change type tab structure and cylindrical battery - Google Patents
Pole piece, coil core with gradual change type tab structure and cylindrical battery Download PDFInfo
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- CN220209010U CN220209010U CN202321371233.3U CN202321371233U CN220209010U CN 220209010 U CN220209010 U CN 220209010U CN 202321371233 U CN202321371233 U CN 202321371233U CN 220209010 U CN220209010 U CN 220209010U
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- 230000008859 change Effects 0.000 title claims abstract description 22
- 238000004804 winding Methods 0.000 claims abstract description 130
- 239000011248 coating agent Substances 0.000 claims abstract description 9
- 238000000576 coating method Methods 0.000 claims abstract description 9
- 230000000712 assembly Effects 0.000 claims description 6
- 238000000429 assembly Methods 0.000 claims description 6
- 239000003792 electrolyte Substances 0.000 abstract description 28
- 230000035699 permeability Effects 0.000 abstract description 7
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000011888 foil Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- JRBRVDCKNXZZGH-UHFFFAOYSA-N alumane;copper Chemical compound [AlH3].[Cu] JRBRVDCKNXZZGH-UHFFFAOYSA-N 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000004898 kneading Methods 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000011149 active material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000005405 multipole Effects 0.000 description 1
- 239000007773 negative electrode material Substances 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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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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Abstract
The application provides a pole piece, roll up core and cylinder battery with gradual change formula tab structure, above-mentioned pole piece is including coating district and blank district, the blank district is located the first side of coating district, the outside edge of one side is formed with m tab that increases gradually on the length direction of blank district, each tab interval sets up, be formed with the pole piece clearance between two adjacent tabs, the width in n pole piece clearance increases gradually on the length direction of pole piece, 1 st tab is convoluteed and is formed first full tab coiling portion, 1 last tab is convoluteed and is formed full tab coiling portion of second, arbitrary two adjacent tabs are formed with local overlap region. According to the pole piece, as the m sequentially increasing pole lugs are arranged at intervals to form n sequentially increasing pole piece gaps, compared with the traditional full pole lugs, the pole piece structure not only reduces pole lug compactness and improves the permeability of electrolyte, but also reduces the weight of a bare chip and improves the diversion utilization rate of the winding core with the gradual change pole lug structure.
Description
Technical Field
The utility model relates to the technical field of cylindrical battery production, in particular to a pole piece, a winding core with a gradual change type pole lug structure and a cylindrical battery.
Background
At present, the pole lugs of the cylindrical winding core in the market mainly comprise two types of full pole lugs and multi-pole lugs. Because the full tab is rolled and flattened mainly by taking the blank foil areas of the positive and negative electrode plates as the tab, so that a compact full tab is formed at two ends of the bare chip, as disclosed in patent CN 115632215A, the internal resistance of the cylindrical battery is greatly reduced because the compact full tab is formed at two ends of the bare chip, and the electrical performance of the cylindrical battery is improved, and therefore, the full tab design is favored by a plurality of research and development workers.
However, in practical applications, the cylindrical battery of the full tab design has the following problems:
1) The difficulty of kneading the full tab is high, and the safety problem caused by kneading or pole piece breaking is easy to occur;
2) The compactness of the full tab is high, so that the electrolyte permeation difficulty is high;
3) The full tab has good flow guiding performance, but the phenomenon of excessive flow guiding exists in the full tab system, namely the flow guiding utilization rate of the full tab is lower.
Disclosure of Invention
The utility model aims to overcome the defects in the prior art and provide a pole piece, a winding core and a cylindrical battery, wherein the pole piece has low rubbing difficulty, high compactness of the pole lugs, and is capable of improving the permeability of electrolyte, reducing the weight of the cylindrical battery and improving the flow guiding utilization rate of the pole lugs.
The aim of the utility model is realized by the following technical scheme:
the pole piece comprises a coating area and a blank area, wherein the blank area is positioned at one side of the coating area, m sequentially increasing pole lugs are formed at the outer edge of one side of the blank area in the length direction, each pole lug is arranged at intervals, pole piece gaps are formed between two adjacent pole lugs, m pole lugs jointly form n pole piece gaps, and the widths of the n pole piece gaps sequentially increase in the length direction of the pole piece;
n and m are integers greater than or equal to 1, n is smaller than m, m pole lugs are sequentially defined as 1 st pole lug along the length direction of the pole piece, 1 st pole lug is wound to form a first full pole lug winding part, 1 last pole lug is wound to form a second full pole lug winding part, and any two adjacent pole lugs are formed with local overlapping areas, so that the pole piece is formed with intermittent continuous overlapping parts along the winding direction, and the intermittent continuous overlapping parts comprise a plurality of local overlapping areas.
In one embodiment, the length of the 1 st tab is equal to the sum of the circumferences of a coil a of the pole piece, and a is an integer greater than or equal to 1;
the length of the m-1 th tab is KxLC < (1-K) < x > LC < +1+d >, wherein K is (1/10-9/10), d is the length of the local overlapping area, c is the number of turns of the m-1 th tab along with the winding of the pole piece, c is an integer greater than or equal to 2, m is an integer greater than or equal to 3, and d is an integer;
the length of the last 1 tab is equal to the sum of the circumferences of the coils b of the pole piece winding, and b is an integer greater than or equal to 1.
In one embodiment, n pole piece gaps are sequentially defined as 1 st pole piece gaps along the length direction of the pole piece;
the width of the 1 st pole piece gap is (1-K) multiplied by LC;
the width of the nth pole piece gap is (KxLC+1-d) + (1-K) xLC+2, and n-1 is an integer greater than 2.
A roll core with a gradual change type tab structure comprises a positive plate, a negative plate and a diaphragm arranged between the positive plate and the negative plate, wherein the positive plate and/or the negative plate adopts the electrode plate according to any embodiment.
In one embodiment, the positive electrode sheet, the separator and the negative electrode sheet are wound to form a bare chip and a tab assembly, and the tab assembly is wound on one side of the bare chip.
In one embodiment, the positive plate, the separator and the negative plate are wound to form a bare core and two tab assemblies, and the two tab assemblies are wound on two sides of the bare core respectively.
In one embodiment, the tab assembly includes a first full tab winding portion, a discontinuous continuous overlapping portion, and a second full tab winding portion, where the first full tab winding portion, the discontinuous continuous overlapping portion, and the second full tab winding portion are sequentially spaced along a winding direction, the first full tab winding portion, the discontinuous continuous overlapping portion, and the second full tab winding portion are sequentially spaced along the winding direction, the discontinuous continuous overlapping portion includes a plurality of local overlapping regions, the local overlapping regions include a first overlapping region, a second overlapping region, and k middle overlapping regions between the first overlapping region and the second overlapping region, k is an integer greater than or equal to 1, the first overlapping region is a overlapping region of the first full tab winding portion and the discontinuous continuous overlapping portion, and the second overlapping region is a overlapping region of the second full tab winding portion and the discontinuous continuous overlapping portion, and each middle overlapping region includes a first overlapping region, a second overlapping region, and a width of each middle overlapping region is smaller than a width of the first full tab winding portion.
In one embodiment, k of the intermediate overlap regions are located on one side of the end of the die.
In one embodiment, the intermittent continuous overlapping portion includes a plurality of tab coils, each tab coil is sequentially disposed at intervals from inside to outside along the winding direction of the bare die, and each adjacent two tab coils are formed with a gap in the winding direction of the bare die, each tab coil has an opening, a start section, a winding section and an end section, the start section is connected with the end section through the winding section, and the start section and the end section form the middle overlapping region and the opening.
A cylindrical battery comprising a jellyroll as in any one of the embodiments above.
Compared with the prior art, the utility model has at least the following advantages:
1) According to the pole piece, as the m sequentially increasing pole lugs are formed at the outer edge of one side of the length direction of the blank area of the pole piece, and each pole lug is arranged at intervals, the pole lug gaps are formed between two adjacent pole lugs, so that the m pole lugs jointly form n pole lug gaps, the widths of the n pole lug gaps are sequentially increased in the length direction of the pole piece, and therefore, compared with all pole lugs, the distribution density of the pole lugs is greatly reduced due to the existence of the n pole lug gaps, the difficulty of pole lug rubbing is relatively high, and the problem of safety caused by excessive rubbing or pole piece rubbing during rubbing operation is effectively avoided; but also can reduce the compactness of the electrode lugs, thereby improving the permeability of the electrolyte to improve the phenomenon of higher difficulty in the electrolyte permeation.
2) The pole pieces can effectively reduce the weight of the bare chip due to the gaps of the n pole pieces, thereby reducing the weight of the cylindrical battery, being beneficial to preparing the portable battery module and being particularly suitable for the application of the battery module of the new energy automobile.
3) The pole piece is provided with the winding core with the gradual change type pole lug structure, and the m pole lugs and the n pole pieces are in clearance fit use, so that the 1 st pole lug can be wound to form a first full pole lug winding part after the winding operation, the last 1 pole lug is wound to form a second full pole lug winding part, and any two adjacent pole lugs are provided with local overlapping areas, so that the winding core with the gradual change type pole lug structure is provided with intermittent continuous overlapping parts along the winding direction, and the intermittent continuous overlapping parts comprise a plurality of the local overlapping areas.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a pole piece according to an embodiment of the present utility model;
FIG. 2 is a schematic view illustrating a direction structure of a winding core according to an embodiment of the present utility model;
fig. 3 is a top view of the winding core shown in fig. 2.
Reference numerals: 10. a winding core; 100. a bare core; 110. a pole piece; 111. a tab; 112. pole piece gaps; 200. a tab assembly; 210. a first full tab winding portion; 230. a second full tab winding portion; 220. a discontinuous continuous overlapping portion; 221. a tab ring; 222. a gap; 223. a first sub-ear; 224. a second sub-ear; 240. a first overlap region; 250. a second overlap region; 260. a middle overlap region; 270. an opening.
Detailed Description
In order that the utility model may be readily understood, a more complete description of the utility model will be rendered by reference to the appended drawings. The drawings illustrate preferred embodiments of the utility model. This utility model may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
For better understanding of the technical solutions and advantageous effects of the present application, the following details are further described with reference to specific embodiments:
as shown in fig. 1, in the pole piece 110 of an embodiment, the pole piece 110 includes a coating area and a blank area, the blank area is located at a first side of the coating area, m sequentially increasing tabs 111 are formed at an outer edge of one side of the blank area in a length direction, each tab 111 is disposed at intervals, a pole piece gap 112 is formed between two adjacent tabs 111, so that n pole piece gaps 112 are formed by m pole tabs 111 together, and n pole piece gaps 112 sequentially increase in width in the length direction of the pole piece 110; wherein n and m are integers greater than or equal to 1, n is less than m, m tabs 111 are sequentially defined as 1 st tab 111 along the length direction of the pole piece 110, the 1 st tab 111 is wound to form a first full tab winding portion 210, the last 1 tab 111 is wound to form a second full tab winding portion 230, and any two adjacent tabs 111 are formed with local overlapping regions, so that the pole piece 110 is formed with discontinuous continuous overlapping portions 220 along the winding direction, and the discontinuous continuous overlapping portions comprise a plurality of the local overlapping regions.
In the pole piece 110, since m sequentially increasing pole lugs 111 are formed at the outer edge of one side of the blank area of the pole piece 110 in the length direction, and each pole lug 111 is arranged at intervals, a pole piece gap 112 is formed between two adjacent pole lugs 111, so that m pole lugs 111 jointly form n pole piece gaps 112, and the widths of n pole piece gaps 112 sequentially increase in the length direction of the pole piece 110, compared with all pole lugs, the distribution density of the pole lugs 111 is greatly reduced due to the existence of n pole piece gaps 112, the difficulty of rubbing the pole lugs 111 is relatively high, and the problem of safety caused by excessive rubbing of the pole lugs 111 or the breaking of the pole piece 110 during rubbing operation is effectively avoided; and the compactness of the electrode lugs 111 can be reduced, so that the permeability of the electrolyte is improved, and the difficulty of the electrolyte permeation is reduced.
Further, due to the n pole piece gaps 112, the weight of the bare chip 100 can be effectively reduced, so that the weight of the cylindrical battery is reduced, the portable battery module is facilitated to be prepared, and the battery module is particularly suitable for application of new energy automobile battery modules.
Further, due to the matching use of the m sequentially increasing tabs 111 and the n pole piece gaps 112, the 1 st tab 111 of the pole piece 110 can be wound to form the first full tab winding portion 210 after the winding operation, the last 1 first tab 111 is wound to form the second full tab winding portion 230, and any two adjacent tabs 111 are formed with local overlapping areas, so that the pole piece 110 is formed with an intermittent continuous overlapping portion 220 along the winding direction, and the intermittent continuous overlapping portion 220 includes a plurality of the local overlapping areas, so as to ensure that a better current guiding performance is provided among the intermittent continuous overlapping portion 220, the first full tab winding portion 210 and the second full tab winding portion 230, and thus, under the condition that the overall resistance change of the winding core 10 with the gradually-changed tab structure is not great, the winding core 10 with the gradually-changed tab structure is ensured to have a better current guiding performance, the phenomenon of current guiding surplus in the traditional full tab is effectively avoided, and the current guiding utilization rate of the winding core 10 with the gradually-changed tab structure is improved.
In this embodiment, the electrode sheet 110 is copper aluminum foil, the coating region is used to coat active materials such as positive electrode active materials or negative electrode active materials, and the blank region is copper aluminum foil to ensure conductivity of the tab 111.
In one embodiment, the length of the 1 st tab 111 is equal to the sum of the respective circumferences of the pole piece 110 wound a turns, a being an integer greater than or equal to 1; the length of the m-1 th tab 111 is kxlc+ [ (1-K) ×lc+1+d ], where K is (1/10-9/10), d is the length of the partial overlap region, c is the number of turns of the m-1 st tab 111 wound with the pole piece 110, c is an integer greater than or equal to 2, m is an integer greater than or equal to 3, and d is an integer; the length of the last 1 tab 111 is equal to the sum of the circumferences of the wound b turns of the pole piece 110, and b is an integer greater than or equal to 1.
It can be understood that by setting the 1 st tab 111 and the last 1 st tab 111 to be all-tab designs, the 1 st tab 111 is located at the innermost side of the winding direction after the pole piece 110 is wound, and the last 1 st tab 111 is located at the outermost side of the winding direction, so as to ensure that the pole pieces 110 have better stability of the current conductivity of the innermost layer and the outermost layer after the winding, specifically, by designing the 1 st tab 111 to be capable of forming an a-turn after the winding, a can be 1,2,3, … …, etc., when a is 2, the length of the 1 st tab 111 is l1+l2, wherein L1 is the circumference of the 1 st turn formed along the winding direction of the pole piece 110, L2 is the circumference of the 2 nd turn formed along the winding direction of the pole piece 110, so as to realize the setting of the first all-tab winding portion 210, and likewise, the last 1 tab 111 can be formed into a-turn after the winding, b can be 1,2,3, … …, etc., and when b is 2, the length of the last 1 tab 111 is l+l2, so as to realize the setting of the all-tab portion 230.
In order to ensure that a plurality of tabs 111 located between the 1 st tab 111 and the last 1 tab 111 form an intermittent continuous overlap 220 after being wound along the pole piece 110, as shown in fig. 1 and 3, in this embodiment, by setting the length of the m-1 st tab to be kxlc+ [ (1-K) ×lc+1+d ], where K is (1/10 to 9/10), d is the length of the partial overlap region, c is the number of turns of the m-1 st tab with the pole piece, c is an integer greater than or equal to 2, m is an integer greater than or equal to 3, d is an integer, and the width of the 1 st pole piece gap 112 is (1-K) ×lc; the width of the nth pole piece gap 112 is (kxlc+1-d) + (1-K) ×lc+2, n-1 is an integer greater than 2, so as to better ensure that the (m-1) th pole tab 111 can form a pole tab ring 221 in the winding direction of the pole piece 110, and a local overlapping area is formed between adjacent pole tab rings 221, so that the (m-1) th pole tab 111 forms an intermittent continuous overlapping portion 220 along the winding direction of the pole piece 110.
Further, K is 1/2, d is 3mm, so as to better ensure that the partial overlapping area formed by the m-1 th tabs 111 along the winding direction of the pole piece 110 is relatively suitable, so that the overall resistance change of the winding core 10 is better ensured to ensure that the winding core 10 has better conductivity, the phenomenon of excessive flow guiding in the traditional full tab is effectively avoided, the flow guiding utilization rate of the winding core 10 with a gradual tab structure is improved, meanwhile, the electrolyte permeation is accelerated, the electrolyte permeation effect is effectively improved, the phenomenon that the winding core 100 is easily deformed in the process of injecting the electrolyte is avoided under the condition that the electrolyte circulation speed is improved, and the yield of the winding core 10 with the gradual tab is ensured.
The application also provides a winding core 10 with a gradual change type tab structure, which comprises a positive plate, a negative plate and a diaphragm arranged between the positive plate and the negative plate, wherein the positive plate and/or the negative plate adopts the electrode plate according to any embodiment.
It can be appreciated that the pole piece 110 of the present application may be used on a positive pole piece or a negative pole piece alone, when being used on a positive pole piece or a negative pole piece alone, as shown in fig. 2, in an embodiment, the positive pole piece, the diaphragm and the negative pole piece are wound to form a bare chip 100 and a pole ear assembly 200, and the pole ear assembly 200 is wound and arranged on one side of the bare chip 100, so as to effectively reduce the distribution density of the pole ear 111 on one side of the bare chip 100, thereby improving the penetration difficulty of the electrolyte and reducing the rubbing difficulty.
In another embodiment, the positive plate and the negative plate can simultaneously use the electrode plate 110 of the application, the positive plate, the diaphragm and the negative plate are wound to form the bare chip 100 and two tab assemblies 200, and the two tab assemblies 200 are respectively wound on two sides of the bare chip 100, so that the distribution density of the tabs 111 on two sides of the bare chip 100 can be further improved, the permeation difficulty of electrolyte is improved more effectively, and the rubbing difficulty is greatly reduced. That is, the circulation of the electrolyte on the second side of the bare chip 100 is improved, and the circulation of the electrolyte inside the bare chip 100 is quickened, so that the electrolyte is more beneficial to the permeation of the electrolyte inside the bare chip 100, the permeation effect of the electrolyte is better improved, meanwhile, the proper pressure difference on two sides of the bare chip 100 is effectively ensured, the phenomenon that the bare chip 100 is easy to deform in the process of injecting the electrolyte is effectively avoided under the condition that the circulation speed of the electrolyte is improved, and the yield of the winding core 10 with the gradual-change type tab is ensured.
In one embodiment, the tab assembly 200 is wound around the edge of the die 100, the tab assembly 200 includes a first full tab winding portion 210, a discontinuous continuous overlapping portion 220, and a second full tab winding portion 230, the discontinuous continuous overlapping portion 220 includes a plurality of partial overlapping regions, the partial overlapping regions include a first overlapping region 240, a second overlapping region 250, and k middle overlapping regions 260 between the first overlapping region 240 and the second overlapping region 250, k is an integer greater than or equal to 1, the first overlapping region 240 is a region where the first full tab winding portion 210 overlaps the discontinuous continuous overlapping portion 220, the second overlapping region 250 is a region where the second full tab winding portion 230 overlaps the discontinuous continuous overlapping portion 220, a width of each middle overlapping region 260 is smaller than a width of the first full tab winding portion 210, and a width of each middle overlapping region 260 is smaller than a width of the second full tab winding portion 230.
It can be appreciated that, since the first full tab winding portion 210, the discontinuous continuous overlapping portion 220 and the second full tab winding portion 230 of the tab assembly 200 are sequentially arranged at intervals along the winding direction, a gap 222 can be formed between the first full tab winding portion 210, the discontinuous continuous overlapping portion 220 and the second full tab winding portion 230, so that the distribution density of the tabs 111 is greatly reduced, the difficulty of flattening the tabs 111 is reduced, and the safety problem caused by excessive rubbing of the tabs 111 or breaking of the pole pieces 110 during the flattening operation is effectively avoided; and the compactness of the electrode lugs 111 can be reduced, so that the permeability of the electrolyte is improved, and the difficulty of the electrolyte permeation is reduced. Further, since the intermittent continuous overlapping portion 220 further includes k middle overlapping regions 260, the width of each middle overlapping region 260 is smaller than the width of the first full tab winding portion 210, and the width of each middle overlapping region 260 is smaller than the width of the second full tab winding portion 230, so as to ensure that the intermittent continuous overlapping portion 220 is obtained, further reduce the distribution density of the tabs 111, better reduce the compactness of the tabs 111, and ensure that the tab assembly 200 has better conductivity, thus ensuring that the winding core 10 has better conductivity under the condition of ensuring that the overall resistance of the winding core 10 does not change greatly, effectively avoiding the phenomenon of excessive conductivity in the traditional full tab, and further improving the flow conductivity utilization of the winding core 10.
As shown in fig. 3, in one embodiment, k middle overlapping areas 260 are located at one side of the end of the die 100, so as to ensure that the pressure difference at two sides of the die 100 is relatively suitable, and thus, under the condition of reducing the compactness of the tab 111, the overall resistance of the winding core 10 is ensured not to be changed basically, so as to ensure that the tab assembly 200 has relatively good conductivity, and effectively avoid the phenomenon of excessive flow conductivity in the traditional full tab, thereby improving the flow conductivity utilization rate of the winding core 10, and simultaneously ensuring that the pressure difference at two sides of the die 100 is relatively suitable to effectively avoid the phenomenon that the pressure difference at two sides is relatively large so as to cause deformation easily occurring during liquid injection.
As shown in fig. 3, in one embodiment, the intermittent continuous overlapping portion 220 includes a plurality of tab coils 221, each tab coil 221 is sequentially disposed at intervals from inside to outside along the winding direction of the die 100, and each adjacent two tab coils 221 are formed with a gap 222 in the winding direction of the die 100, each tab coil 221 has an opening 270, a start section, a winding section, and an end section, the start section is connected to the end section through the winding section, and the start section and the end section form the middle overlapping region 260 and the opening 270.
It can be appreciated that, since the plurality of tab rings 221 are sequentially spaced from inside to outside along the winding direction of the bare core 100, a plurality of gaps 222 are formed in the winding direction of the bare core 100 by the plurality of tab rings 221, so that the distribution density of the tab 111 is further reduced, the compactness and the rubbing difficulty of the tab assembly 200 are better reduced, and each tab ring 221 has an opening 270, a starting section, a winding section and an ending section, the starting section is connected with the ending section through the winding section, and the starting section and the ending section form the middle overlapping region 260 and the opening 270, so that the plurality of tab rings 221 form a plurality of staggered channels in the k middle overlapping regions 260, the compactness and the rubbing difficulty of the tab assembly 200 are further reduced, and meanwhile, the staggered channels are beneficial to the electrolyte to circulate inside the bare core 100 more rapidly and not deform, so that the yield of the rolled core 10 is improved.
As shown in fig. 3, in one embodiment, the tab rings 221 are uniformly distributed at the end of the die 100, so as to better ensure that the intermittent continuous overlapping portion 220 has a relatively uniform flow guiding, and ensure that the pressure difference inside the die 100 is relatively suitable, thereby effectively avoiding the phenomenon that the winding core 10 is easily deformed during the injection process due to the relatively large pressure difference inside the die 100.
Further, as shown in fig. 3, in one embodiment, each tab ring 221 includes a first sub-tab 223 and a second sub-tab 224, the first sub-tab 223 is connected with the second sub-tab 224, the initial section of the first sub-tab 223 and the initial section of the second sub-tab 224 are mutually overlapped to form a middle overlapping region 260 and an opening 270, and each first sub-tab 223 and each second sub-tab 224 are staggered along the radial direction of the end of the bare die 100, so as to ensure that a plurality of staggered channels can be formed by the first sub-tab 223 and the second sub-tab 224 at the end of the bare die 100, thereby facilitating the electrolyte to circulate inside the bare die 100 more quickly and not to deform, and improving the yield of the rolled core 10 with gradually-shaped tabs.
In one embodiment, when the first sub-tab 223 is located in an odd number of turns, the length of the first sub-tab 223 is 1/2 of the circumference of the winding turn, and when the second sub-tab 224 is located in an even number of turns, the length of the second sub-tab 224 is the sum of 1/2 of the circumference of the winding turn and the length d of the middle overlapping region 260, so as to ensure that the initial section of the first sub-tab 223 and the initial section of the second sub-tab 224 overlap each other to form the middle overlapping region 260 and the opening 270, and ensure that each tab turn 221 can be uniformly distributed at the end of the die 100.
Further, in one embodiment, d is 3mm, so as to ensure that the positions of the k middle overlapping regions 260 are relatively suitable, on one hand, better ensuring that the middle part of the discontinuous continuous overlapping portion 220 has better conductivity, and on the other hand, ensuring that the thickness of the overlapping of the tab assembly 200 is relatively suitable, so as to reduce the compactness of the tab 111 in a larger range, and further facilitate the penetration of the electrolyte.
The application also provides a cylindrical battery, which comprises the winding core 10 with the gradual change type tab structure. It can be understood that by applying the winding core 10 with the gradual change type tab of the present application to a cylindrical battery, not only the compactness of the tab 111 can be reduced and the permeability of the electrolyte can be improved, but also the weight of the bare chip 100 can be reduced and the flow guiding utilization rate of the gradual change type tab 111 structure can be improved.
Compared with the prior art, the utility model has at least the following advantages:
1) In the pole piece 110, since m sequentially increasing pole lugs 111 are formed at the outer edge of one side of the blank area of the pole piece 110 in the length direction, and each pole lug 111 is arranged at intervals, a pole piece gap 112 is formed between two adjacent pole lugs 111, so that m pole lugs 111 jointly form n pole piece gaps 112, and the widths of n pole piece gaps 112 sequentially increase in the length direction of the pole piece 110, compared with all pole lugs, the distribution density of the pole lugs 111 is greatly reduced due to the existence of n pole piece gaps 112, the difficulty of rubbing the pole lugs 111 is relatively high, and the problem of safety caused by excessive rubbing of the pole lugs 111 or the breaking of the pole piece 110 during rubbing operation is effectively avoided; but also can reduce the compactness of the electrode lug 111, thereby improving the permeability of the electrolyte so as to improve the phenomenon of high difficulty in the electrolyte permeation.
2) The pole pieces 110 can effectively reduce the weight of the bare chip 100 due to the n pole piece gaps 112, thereby reducing the weight of the cylindrical battery, being beneficial to preparing a portable battery module, and being particularly suitable for the application of the battery module of a new energy automobile.
3) In the pole piece 110, due to the matching use of the m sequentially increasing pole tabs 111 and the n pole piece gaps 112, the 1 st pole tab 111 can be wound to form the first full-pole tab winding portion 210 after the winding operation of the pole piece 110, the last 1 pole tab 111 is wound to form the second full-pole tab winding portion 230, and any two adjacent pole tabs 111 are formed with local overlapping areas, so that the winding core 10 with the gradual change pole tab structure of the gradual change pole tab 111 is formed with intermittent continuous overlapping portions 220 along the winding direction, and the intermittent continuous overlapping portions 220 comprise a plurality of the local overlapping areas, so that the winding core 10 with the gradual change pole tab structure is ensured to have better current guiding performance under the condition that the overall resistance of the winding core 10 with the gradual change pole tab structure is not greatly changed, the current guiding utilization rate of the winding core 10 with the gradual change pole tab structure in the traditional full-change pole tab is effectively avoided, and the current guiding utilization rate of the winding core 10 with the gradual change pole tab structure is improved.
The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.
Claims (10)
1. The pole piece comprises a coating area and a blank area, and is characterized in that the blank area is positioned at one side of the coating area, m sequentially increasing pole lugs are formed at the outer edge of one side of the blank area in the length direction, each pole lug is arranged at intervals, pole piece gaps are formed between two adjacent pole lugs, m pole lugs jointly form n pole piece gaps, and the widths of the n pole piece gaps sequentially increase in the length direction of the pole piece;
n and m are integers greater than or equal to 1, n is smaller than m, m pole lugs are sequentially defined as 1 st pole lug along the length direction of the pole piece, 1 st pole lug is wound to form a first full pole lug winding part, 1 last pole lug is wound to form a second full pole lug winding part, and any two adjacent pole lugs are formed with local overlapping areas, so that the pole piece is formed with intermittent continuous overlapping parts along the winding direction, and the intermittent continuous overlapping parts comprise a plurality of local overlapping areas.
2. The pole piece of claim 1, wherein the length of the 1 st pole tab is equal to the sum of the circumferences of the pole piece wound a turns, a being an integer greater than or equal to 1;
the length of the m-1 th tab is KxLC < (1-K) < x > LC < +1+d >, wherein K is (1/10-9/10), d is the length of the local overlapping area, c is the number of turns of the m-1 th tab along with the winding of the pole piece, c is an integer greater than or equal to 2, m is an integer greater than or equal to 3, and d is an integer;
the length of the last 1 tab is equal to the sum of the circumferences of the coils b of the pole piece winding, and b is an integer greater than or equal to 1.
3. The pole piece of claim 1, wherein n pole piece gaps are defined sequentially along the length of the pole piece as 1 st pole piece gaps;
the width of the 1 st pole piece gap is (1-K) multiplied by LC;
the width of the nth pole piece gap is (KxLC+1-d) + (1-K) xLC+2, and n-1 is an integer greater than 2.
4. A winding core with a gradual change type tab structure, comprising a positive plate, a negative plate and a diaphragm arranged between the positive plate and the negative plate, wherein the positive plate and/or the negative plate adopts the electrode plate as claimed in any one of claims 1 to 3.
5. The winding core according to claim 4, wherein the positive electrode sheet, the separator and the negative electrode sheet are wound to form a bare core and a tab assembly, and the tab assembly is wound on one side of the bare core.
6. The winding core according to claim 4, wherein the positive electrode sheet, the separator and the negative electrode sheet are wound to form a bare core and two tab assemblies, and the two tab assemblies are wound on two sides of the bare core respectively.
7. The winding core according to claim 5 or 6, wherein the tab assembly comprises a first full tab winding portion, a discontinuous continuous overlapping portion, and a second full tab winding portion, the first full tab winding portion, the discontinuous continuous overlapping portion, and the second full tab winding portion being sequentially spaced apart along a winding direction, the discontinuous continuous overlapping portion comprising a plurality of partial overlapping regions, the plurality of partial overlapping regions comprising a first overlapping region, a second overlapping region, and k intermediate overlapping regions between the first overlapping region and the second overlapping region, k being an integer greater than or equal to 1, the first overlapping region being an overlapping region of the first full tab winding portion and the discontinuous continuous overlapping portion, the second overlapping region being an overlapping region of the second full tab winding portion and the discontinuous continuous overlapping portion, each of the intermediate overlapping regions having a width less than a width of the first full tab winding portion, each of the intermediate overlapping regions being a width less than a width of the second full tab winding portion.
8. The winding core according to claim 7, wherein k of said intermediate overlap regions are located on one side of an end of said die.
9. The winding core according to claim 8, wherein the intermittent continuous overlapping portion includes a plurality of tab coils, each of the tab coils being disposed at intervals in the winding direction of the bare core from inside to outside in sequence, and each adjacent two of the tab coils being formed with a gap in the winding direction of the bare core, each of the tab coils having an opening, a start section, a winding section, and an end section, the start section being connected to the end section by the winding section, and the start section and the end section forming the intermediate overlapping region and the opening.
10. A cylindrical battery comprising a winding core according to any one of claims 4 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321371233.3U CN220209010U (en) | 2023-05-31 | 2023-05-31 | Pole piece, coil core with gradual change type tab structure and cylindrical battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321371233.3U CN220209010U (en) | 2023-05-31 | 2023-05-31 | Pole piece, coil core with gradual change type tab structure and cylindrical battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220209010U true CN220209010U (en) | 2023-12-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321371233.3U Active CN220209010U (en) | 2023-05-31 | 2023-05-31 | Pole piece, coil core with gradual change type tab structure and cylindrical battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220209010U (en) |
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2023
- 2023-05-31 CN CN202321371233.3U patent/CN220209010U/en active Active
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