CN219534810U - Lithium ion battery - Google Patents
Lithium ion battery Download PDFInfo
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- CN219534810U CN219534810U CN202320063941.4U CN202320063941U CN219534810U CN 219534810 U CN219534810 U CN 219534810U CN 202320063941 U CN202320063941 U CN 202320063941U CN 219534810 U CN219534810 U CN 219534810U
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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 utility model discloses a lithium ion battery. The lithium ion battery includes: n winding cores which are adjacently arranged, wherein each winding core is connected in parallel; wherein n is an integer greater than or equal to 2; the roll core comprises: a positive pole piece and a negative pole piece; the positive pole piece and the negative pole piece are folded in a crossing way to form a winding core with a laminated structure, the part of the positive pole piece, which is folded and protrudes out of the edge of the winding core, is a positive pole lug, and the part of the negative pole piece, which is folded and protrudes out of the edge of the winding core, is a negative pole lug; at least part of the positive electrode lugs and/or at least part of the negative electrode lugs are V-shaped. The technical scheme of the embodiment of the utility model can reduce the number of burrs generated at the edge of the electrode plate, effectively prevent the tab of the lithium ion battery from turning over, reduce the risk of internal short circuit of the lithium ion battery and improve the safety.
Description
Technical Field
The embodiment of the utility model relates to the technical field of lithium ion batteries, in particular to a lithium ion battery.
Background
In the development of batteries, as a lithium ion battery having importance among rechargeable batteries, the range of use thereof is becoming wider and wider.
In the prior art, a lamination structure is mostly adopted in the high-power lithium ion battery. However, lamination requires die cutting of the pole pieces during manufacture. Therefore, burrs are easily formed on the edges of the die-cut pole pieces. In addition, the tab formed after die cutting is easy to turn over, so that the lithium ion battery has potential safety hazard of internal short circuit.
Disclosure of Invention
The utility model provides a lithium ion battery, which is used for reducing the number of burrs at the edge of an electrode plate and preventing tabs from turning over.
According to an aspect of the present utility model, there is provided a lithium ion battery including: n winding cores which are adjacently arranged, wherein the winding cores are connected in parallel; wherein n is an integer greater than or equal to 2;
the winding core comprises: a positive pole piece and a negative pole piece; the positive pole piece and the negative pole piece are folded in a crossing way to form the winding core with a laminated structure, the part of the positive pole piece, which is folded and protrudes out of the edge of the winding core, is a positive pole lug, and the part of the negative pole piece, which is folded and protrudes out of the edge of the winding core, is a negative pole lug;
at least part of the positive electrode lugs and/or at least part of the negative electrode lugs are V-shaped.
Optionally, the positive pole piece comprises a plurality of positive pole material areas and a plurality of positive pole blank areas, and the positive pole material areas and the positive pole blank areas are intermittently arranged along the extending direction of the positive pole piece in an unfolding state;
the negative electrode plate comprises a plurality of negative electrode material areas and a plurality of negative electrode blank areas, and the negative electrode material areas and the negative electrode blank areas are intermittently arranged along the extending direction of the negative electrode plate in an unfolding state;
the positive electrode material region is used for bearing a coated positive electrode material, and the negative electrode material region is used for bearing a coated negative electrode material; the positive pole blank area is used for reserving an area for folding the positive pole piece, and the negative pole blank area is used for reserving an area for folding the negative pole piece.
Optionally, the plurality of positive electrode blank areas comprise a plurality of first positive electrode folding areas; the first positive electrode folding area is used for folding to form the positive electrode lug;
the plurality of first positive electrode folding areas are sequentially arranged along the extending direction of the positive electrode plate in an unfolding state, and two ends of the positive electrode plate are respectively provided with half of the first positive electrode folding areas;
or the positive electrode blank areas comprise a plurality of first positive electrode folding areas and a plurality of second positive electrode folding areas;
the first positive electrode folding areas and the second positive electrode folding areas are intermittently arranged along the extending direction of the positive electrode plate in an unfolding state, and two ends of the positive electrode plate are provided with half of the first positive electrode folding areas.
Optionally, the plurality of negative electrode blank areas include: a plurality of first negative electrode folding regions; the first negative electrode folding area is used for folding to form the negative electrode tab;
the plurality of first negative electrode folding areas are sequentially arranged along the extending direction of the negative electrode plate in an unfolding state, and two ends of the negative electrode plate are respectively provided with half of the first negative electrode folding areas;
alternatively, the plurality of negative electrode blank areas include: a plurality of the first anode folding regions and a plurality of the second anode folding regions; the plurality of first negative electrode folding areas and the plurality of second negative electrode folding areas are intermittently arranged along the extending direction of the negative electrode plate in an unfolding state, and the second negative electrode folding areas are arranged at two ends of the negative electrode plate.
Optionally, the width of the first positive electrode folding region is greater than the width of the second positive electrode folding region, and the width of the first positive electrode folding region is less than the width of the positive electrode sheet;
the width of the first negative electrode folding zone is larger than that of the second negative electrode folding zone, and the width of the first negative electrode folding zone is smaller than that of the negative electrode pole piece.
Optionally, the top tip of the positive electrode tab corresponds to a center line position of the first positive electrode folding region perpendicular to the extending direction of the positive electrode piece in an unfolding state, and two bottom supporting ends of the positive electrode tab are connected with two adjacent positive electrode material regions;
the top tip of the negative electrode tab corresponds to the position of the first negative electrode folding region perpendicular to the central line of the extending direction of the negative electrode pole piece in the unfolding state, and two bottom supporting ends of the negative electrode tab are connected with two adjacent negative electrode material regions.
Optionally, the winding core includes four edges, and the positive electrode tab and the negative electrode tab are respectively disposed at two adjacent edges of the winding core.
Optionally, the winding core includes two positive electrode tabs and one negative electrode tab; the negative electrode tab is arranged at one edge of the winding core, and the two positive electrode tabs are respectively arranged at two edges, adjacent to the negative electrode tab, of the winding core;
or the winding core comprises one positive electrode tab and two negative electrode tabs; the positive electrode tab is arranged at one edge of the winding core, and the two negative electrode tabs are respectively arranged at two edges, adjacent to the positive electrode tab, of the winding core;
or the winding core comprises the positive electrode tab and the negative electrode tab; the positive electrode tab is arranged at one edge of the winding core, and the negative electrode tab is arranged at the edge of the winding core adjacent to the positive electrode tab.
Optionally, a plurality of the positive electrode lugs are stacked and connected to form a positive electrode of the lithium ion battery by welding; and a plurality of negative electrode lugs are stacked and connected into the negative electrode of the lithium ion battery by welding.
Optionally, the lithium ion battery further comprises: an insulating separator layer; the insulating diaphragm layer is arranged between the positive pole piece and the negative pole piece which are adjacently arranged in the lithium ion battery.
The lithium ion battery provided by the embodiment of the utility model comprises a plurality of winding cores which are adjacently arranged, wherein each winding core is connected in parallel. Each winding core comprises a positive pole piece, a negative pole piece, a positive pole piece and a negative pole lug, wherein the positive pole piece and the negative pole piece in an unfolding state are folded in a crossing way to form a winding core with a laminated structure, and the positive pole lug or the negative pole lug which is in a V shape is formed at the position protruding out of the edge of the winding core in a pole piece folding way. Therefore, the die cutting of the tab is not needed, and burrs are avoided. And the positive electrode lug or the negative electrode lug forms a firm triangular stable structure, so that the possibility of turnover of the lug of the lithium ion battery can be effectively reduced, the risk of internal short circuit of the lithium ion battery is reduced, and the safety of the high-power lithium ion battery is improved. In addition, the lithium ion battery is of a full-tab structure and high in overcurrent capacity, so that the lithium ion battery can achieve high power.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the utility model or to delineate the scope of the utility model. Other features of the present utility model will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a front structure of a lithium ion battery according to an embodiment of the present utility model;
fig. 2 is a schematic cross-sectional view of a lithium ion battery along A-A' direction in fig. 1 according to an embodiment of the present utility model;
fig. 3 is a schematic top view of an expanded state of a positive electrode sheet according to an embodiment of the present utility model;
fig. 4 is a schematic top view of an expanded state of a negative electrode tab according to an embodiment of the present utility model;
fig. 5 is a schematic top view of an expanded state of a positive electrode sheet according to an embodiment of the present utility model;
fig. 6 is a schematic top view of an expanded state of a negative electrode tab according to an embodiment of the present utility model;
fig. 7 is a schematic structural view of yet another lithium ion battery according to an embodiment of the present utility model;
fig. 8 is a schematic structural view of yet another lithium ion battery according to an embodiment of the present utility model;
fig. 9 is a schematic view of an initial position of folding a lithium ion battery according to an embodiment of the present utility model;
fig. 10 is a schematic view illustrating an initial position of folding a lithium ion battery according to still another embodiment of the present utility model;
fig. 11 is a schematic view illustrating an initial position of folding a lithium ion battery according to still another embodiment of the present utility model;
fig. 12 is a schematic cross-sectional structure of a composite structure of a negative electrode plate and an insulating separator layer of a lithium ion battery according to an embodiment of the present utility model.
Detailed Description
In order that those skilled in the art will better understand the present utility model, a technical solution in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present utility model and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the utility model described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The embodiment of the utility model provides a lithium ion battery. Fig. 1 is a schematic front structural view of a lithium ion battery according to an embodiment of the present utility model, and fig. 2 is a schematic cross-sectional structural view of a lithium ion battery according to an embodiment of the present utility model along A-A' direction in fig. 1. Referring to fig. 1 and 2, the lithium ion battery includes: n winding cores 10 which are adjacently arranged, wherein each winding core 10 is connected in parallel; wherein n is an integer greater than or equal to 2.
The winding core 10 includes: a positive electrode tab 11 and a negative electrode tab 12; the positive electrode sheet 11 and the negative electrode sheet 12 are cross-folded to form a winding core 10 with a laminated structure, the part of the positive electrode sheet 11 which is folded and protrudes from the edge of the winding core 10 is a positive electrode tab 13, and the part of the negative electrode sheet 12 which is folded and protrudes from the edge of the winding core 10 is a negative electrode tab 14.
At least part of the positive electrode tab 13 and/or at least part of the negative electrode tab 14 are V-shaped.
In particular, different models of lithium ion batteries include different numbers of winding cores 10. The lithium ion battery includes n jelly rolls 10, and illustratively, at least 2 jelly rolls 10. The n winding cores 10 are sequentially and adjacently arranged along the thickness direction of the winding cores, and the n winding cores 10 are connected in parallel. Each of the winding cores 10 includes a positive electrode tab 11, a negative electrode tab 12, a positive electrode tab 13, and a negative electrode tab 14. That is, one complete positive electrode tab 11 or negative electrode tab 12 in an unfolded state may be formed into a plurality of winding cores 10 having a laminated structure by being alternately folded, and the respective winding cores 10 are connected in parallel. In the process of folding a complete positive electrode plate 11 or negative electrode plate 12 in an unfolded state, part of the edge of the formed winding core 10 with a laminated structure is folded to form a protruding part structure, and the protruding structure is the tab of the lithium ion battery. The protruding structure may be, for example, the positive electrode tab 13 or the negative electrode tab 14. In the schematic cross-sectional structure of fig. 2, the positive electrode tab 13 is not shown in fig. 2 because the cross-section is not cut into the positive electrode tab 13. In the lithium ion battery provided in this embodiment, a positive electrode tab 13 is disposed between the positive electrode tabs 11 in every two adjacent winding cores 10, and a negative electrode tab 14 is disposed between the negative electrode tabs 14 in every two adjacent winding cores 10. Therefore, the lithium ion battery is of a full-tab structure and has strong overcurrent capacity, so that the requirement of the lithium ion battery on high power can be met.
When the positive electrode sheet 11 in the unfolded state is folded in the connection area between the two adjacent positive electrode material areas, the two positive electrode material areas respectively form the positive electrode sheet 11 in the two adjacent winding cores 10 which are arranged along the thickness direction of the positive electrode sheet 11, and the connection area between the two adjacent positive electrode material areas forms the V-shaped positive electrode tab 13. The V-shaped positive electrode lug 13 protrudes out of the edge of the winding core 10, and two ends of the V-shaped positive electrode lug are respectively connected with the positive electrode pole pieces 11 in the two adjacent winding cores 10. Similarly, when the negative electrode sheet 12 in the unfolded state is folded in the connection region between the adjacent two portions of the negative electrode material regions, the two portions of the negative electrode material regions respectively form the negative electrode sheet 12 in the adjacent two winding cores 10 arranged in the direction of the thickness thereof, and the connection region between the adjacent two portions of the negative electrode material regions forms the V-shaped negative electrode tab 14. The V-shaped negative electrode tab 14 protrudes out of the edge of the winding core 10, and two ends of the V-shaped negative electrode tab are respectively connected with the negative electrode pieces 12 in the two adjacent winding cores 10. The V-shaped positive electrode tab 13 and the adjacent two positive electrode pole pieces 11 form a firm triangle-shaped stable structure, and the negative electrode tab 14 and the adjacent two negative electrode pole pieces 12 form a firm triangle-shaped stable structure, so that the positive electrode tab 13 or the negative electrode tab 14 in the lithium ion battery can be effectively prevented from being folded, the risk of internal short circuit of the lithium ion battery is reduced, and the safety of the high-power lithium ion battery is improved.
The lithium ion battery provided in this embodiment includes a plurality of winding cores 10 arranged adjacently, and each winding core 10 is connected in parallel. Each winding core 10 comprises a positive electrode plate 11, a negative electrode plate 12, a positive electrode plate 11 and a negative electrode tab 14, wherein the positive electrode plate 11 and the negative electrode plate 12 in an unfolded state are folded in a crossing manner to form the winding core 10 with a laminated structure, and the positive electrode tab 13 or the negative electrode tab 14 in a V-shaped manner is formed at a position protruding out of the edge of the winding core 10 in a pole piece folding manner. Therefore, the die cutting of the tab is not needed, and burrs are avoided. And the positive electrode tab 13 or the negative electrode tab 14 form a firm triangle stable structure, so that the possibility of turning over the tab of the lithium ion battery can be effectively reduced, the risk of internal short circuit of the lithium ion battery is reduced, and the safety of the high-power lithium ion battery is improved. In addition, the lithium ion battery is of a full-tab structure and high in overcurrent capacity, so that the lithium ion battery can achieve high power.
Optionally, fig. 3 is a schematic top view of an expanded state of a positive electrode sheet according to an embodiment of the present utility model, and fig. 4 is a schematic top view of an expanded state of a negative electrode sheet according to an embodiment of the present utility model. On the basis of the above-described embodiment, referring to fig. 3 and 4, the positive electrode tab 11 includes a plurality of positive electrode material regions 111 and a plurality of positive electrode blank regions 112, and the plurality of positive electrode material regions 111 and the plurality of positive electrode blank regions 112 are intermittently arranged along the extending direction X in which the positive electrode tab 11 is in the expanded state.
The negative electrode tab 12 includes a plurality of negative electrode material regions 121 and a plurality of negative electrode blank regions 122, and the plurality of negative electrode material regions 121 and the plurality of negative electrode blank regions 122 are intermittently arranged along an extending direction X in which the negative electrode tab 12 is in a developed state.
The positive electrode material region 111 is used for bearing a coated positive electrode material, and the negative electrode material region 121 is used for bearing a coated negative electrode material; the positive electrode blank area 112 is used for reserving an area for folding the positive electrode sheet 11, and the negative electrode blank area 122 is used for reserving an area for folding the negative electrode sheet 12.
Specifically, the positive electrode sheet 11 is intermittently coated with a positive electrode material along the extending direction X when the positive electrode sheet 11 is in the expanded state, so as to form a plurality of rectangular positive electrode material regions 111. Between two adjacent positive electrode material areas 111 are positive electrode blank areas 112, that is, a plurality of positive electrode material areas 111 and a plurality of positive electrode blank areas 112 are alternately and intermittently arranged along the extending direction X of the positive electrode sheet 11 in an unfolded state. The plurality of positive electrode blank areas 112 serve as folding areas for folding the positive electrode sheet 11.
Similarly, the negative electrode sheet 12 is also intermittently coated with a negative electrode material along the extending direction X when the negative electrode sheet 12 is in the developed state, to form a plurality of rectangular negative electrode material regions 121. Between two adjacent negative electrode material areas 121 are negative electrode blank areas 122, that is, along the extending direction X of the negative electrode pole piece 12 in the unfolded state, a plurality of negative electrode material areas 121 and a plurality of negative electrode blank areas 122 are alternately and intermittently arranged. The plurality of negative electrode blank areas 122 are used as folding areas for folding the negative electrode sheet 12 to form the winding core 10 with a laminated structure together with the positive electrode sheet 11 in a folded state.
Optionally, fig. 5 is a schematic top view of an expanded state of a positive electrode sheet according to an embodiment of the present utility model. On the basis of the above embodiments, referring to fig. 3 and 5, the plurality of positive electrode blank areas 112 includes a plurality of first positive electrode folded areas 1121; the first positive electrode folding region 1121 is used for folding to form a positive electrode tab 13; the plurality of first positive electrode folding areas 1121 are sequentially arranged along the extending direction X of the positive electrode plate 11 in an unfolding state, and two ends of the positive electrode plate 11 are provided with half first positive electrode folding areas 1121;
alternatively, the plurality of positive electrode blank regions 112 includes a plurality of first positive electrode fold regions 1121 and a plurality of second positive electrode fold regions 1122; the first positive electrode folding regions 1121 and the second positive electrode folding regions 1122 are intermittently arranged along the extending direction X of the positive electrode sheet 11 in the unfolded state, and two ends of the positive electrode sheet 11 are provided with half of the first positive electrode folding regions 1121.
Specifically, the positive electrode sheet 11 has different intermittent coating methods, and the number of positive electrode tabs 13 obtained when the positive electrode sheet 11 is folded by the different intermittent coating methods is also different. Illustratively, the positive electrode sheet 11 may include a plurality of first positive electrode folding regions 1121, wherein two ends of the first positive electrode folding regions 1121 are respectively connected to two adjacent positive electrode material regions 111, and the plurality of first positive electrode folding regions 1121 are intermittently arranged with the plurality of positive electrode material regions 111. When the positive electrode sheet 11 is folded and the vertical projections of the folded positive electrode material regions 111 are completely overlapped, the first positive electrode folded regions 1121 are folded into the positive electrode tabs 13, and the vertical projections of the positive electrode tabs 13 are also completely overlapped. And two ends of the positive electrode plate 11 in an unfolding state are respectively provided with a folding area with the size of a half first positive electrode folding area 1121, after the positive electrode plate 11 coated in the intermittent coating mode is folded, the obtained winding core 10 is respectively provided with a plurality of positive electrode lugs 13 with overlapped vertical projections at two opposite edges.
Illustratively, the positive electrode tab 11 may also include a plurality of first positive electrode folding regions 1121 and a plurality of second positive electrode folding regions 1122, and both ends of the first positive electrode folding regions 1121 and the second positive electrode folding regions 1122 are connected with the adjacent two positive electrode material regions 111. The first positive electrode folded region 1121 is folded to form the positive electrode tab 13, and the second positive electrode folded region 1122 is folded to not form the positive electrode tab 13. And two ends of the positive electrode plate 11 in an unfolding state are provided with folding areas with the size of half first positive electrode folding areas 1121, after the positive electrode plate 11 coated in the intermittent coating mode is folded, the obtained winding core 10 is only provided with a plurality of positive electrode lugs 13 with vertical projection overlapping at one edge.
Optionally, fig. 6 is a schematic top view of an expanded state of a negative electrode tab according to an embodiment of the present utility model. On the basis of the above embodiments, referring to fig. 4 and 6, the plurality of negative electrode blank areas 122 includes: a plurality of first negative electrode fold areas 1221; the first negative electrode folding region 1221 is used for folding to form the negative electrode tab 14; the plurality of first negative electrode folding areas 1221 are sequentially arranged along the extending direction X of the negative electrode pole piece 12 in the unfolded state, and two ends of the negative electrode pole piece 12 are provided with half first negative electrode folding areas 1221;
alternatively, the plurality of negative electrode blank areas 122 includes: a plurality of first anode fold areas 1221 and a plurality of second anode fold areas 1222; the plurality of first anode folding regions 1221 and the plurality of second anode folding regions 1222 are intermittently arranged along the extending direction X in which the anode tab 12 is in the unfolded state, and both ends of the anode tab 12 are provided with the second anode folding regions 1222.
Specifically, the negative electrode tab 12 has different intermittent coating methods, and when the negative electrode tab 12 is folded by the different intermittent coating methods, the number of the obtained negative electrode tabs 14 is also different. Illustratively, the anode blank 122 in the anode tab 12 may include a plurality of first anode folded regions 1221, two ends of the first anode folded regions 1221 are respectively connected to two adjacent anode material regions 121, and the plurality of first anode folded regions 1221 are intermittently arranged with the plurality of anode material regions 121. When the negative electrode tab 12 is folded and the vertical projections of the folded negative electrode material areas 121 are completely overlapped, the first negative electrode folding areas 1221 are folded into the negative electrode tabs 14, and the vertical projections of the negative electrode tabs 14 are also completely overlapped. And two ends of the negative electrode sheet 12 in an unfolding state are respectively provided with a folding area of a half first negative electrode folding area 1221, after the negative electrode sheet 12 coated in the intermittent coating mode is folded, the obtained winding core 10 is provided with a plurality of negative electrode tabs 14 which are overlapped in vertical projection at two opposite edges.
Illustratively, the negative electrode tab 12 may also include a plurality of first negative electrode folded regions 1221 and a plurality of second negative electrode folded regions 1222, wherein both ends of the first negative electrode folded regions 1221 and the plurality of second negative electrode folded regions 1222 are connected to the adjacent two negative electrode material regions 121. The first negative electrode folded region 1221 forms the negative electrode tab 14 by folding, and the second negative electrode folded region 1222 does not form the negative electrode tab 14 after folding. And the two ends of the negative electrode sheet 12 in the unfolded state are provided with second negative electrode folding areas 1222, after the negative electrode sheet 12 coated in the intermittent coating mode is folded, the obtained winding core 10 is only provided with a plurality of negative electrode tabs 14 with vertical projection overlapping at one edge.
Alternatively, with continued reference to fig. 3 and 6, based on the embodiments described above, the width D1 of the first positive electrode fold region 1121 is greater than the width D2 of the second positive electrode fold region 1122, and the width D1 of the first positive electrode fold region 1121 is less than the width D of the positive electrode tab 11; the width d1 of the first anode fold area 1221 is greater than the width d2 of the second anode fold area 1222, and the width d1 of the first anode fold area 1221 is less than the width d of the anode tab 12.
Specifically, since the first positive electrode folding region 1121 or the first negative electrode folding region 1221 are used for folding to form the positive electrode tab 13 or the negative electrode tab 14, and the second positive electrode folding region 1122 or the second negative electrode folding region 1222 is used only for folding, the vertical projections of the folded adjacent two positive electrode material regions 111 or the folded adjacent two negative electrode material regions 121 are completely overlapped, and the positive electrode tab 13 or the negative electrode tab 14 is not formed. Accordingly, the width D1 of the first positive electrode folding region 1121 is greater than the width D2 of the second positive electrode folding region 1122, and the width D1 of the first negative electrode folding region 1221 is greater than the width D2 of the second negative electrode folding region 1222. Since the plurality of positive electrode material regions 111 and the plurality of positive electrode blank regions 112 are intermittently arranged in the extending direction X of the positive electrode sheet 11 in the expanded state, and the plurality of negative electrode material regions 121 and the plurality of negative electrode blank regions 122 are intermittently arranged in the extending direction X of the negative electrode sheet 12 in the expanded state, the width D of the positive electrode sheet 11 includes the widths of the plurality of positive electrode material regions 111 and the plurality of positive electrode blank regions 112, and the width D of the positive electrode sheet 11 is larger than the width D1 of the first positive electrode folded region 1121 in the positive electrode blank region 112. The width d of the negative electrode tab 12 is larger than the width d1 of the first negative electrode folded region 1221 in the negative electrode margin 122, as in the positive electrode tab 11.
Alternatively, with continued reference to fig. 1, 3 and 6, on the basis of the above embodiments, the top tip of the positive electrode tab 13 corresponds to the position of the first positive electrode folded region 1121 perpendicular to the middle line of the extending direction X in which the positive electrode tab 11 is in the unfolded state, and the bottom two support ends of the positive electrode tab 13 are connected to the adjacent two positive electrode material regions 111.
The top tip of the negative electrode tab 14 corresponds to a center line position of the first negative electrode folding region 1221 perpendicular to the extending direction X of the negative electrode tab 12 in the unfolded state, and two bottom supporting ends of the negative electrode tab 14 are connected with two adjacent negative electrode material regions 121.
Specifically, taking the negative tab 14 as an example, the position of the first negative folded region 1221 at the center line perpendicular to the extending direction X of the negative electrode tab 12 when it is unfolded is shown in dotted lines in fig. 3 and 6. In the process of folding the first negative electrode folding region 1221 of the negative electrode tab 12, the center line position indicated by the dotted line is used as a crease, when the two adjacent negative electrode material regions 121 are folded to the vertical projection to be completely overlapped, the center line position forms the top tip of the negative electrode tab 14, and the two ends connected with the two adjacent negative electrode material regions 121 are the bottom two ends of the negative electrode tab 14. Therefore, by folding the negative electrode tab 12, the V-shaped negative electrode tab 14 can be formed in the first negative electrode folding area 1221, so as to form a triangular stable structure, and effectively prevent the negative electrode tab 14 from turning over. The positive electrode tab 13 is the same as the negative electrode tab 14, and will not be described here.
Optionally, fig. 7 is a schematic structural diagram of another lithium ion battery provided in an embodiment of the present utility model, and fig. 8 is a schematic structural diagram of another lithium ion battery provided in an embodiment of the present utility model. On the basis of the above embodiments, referring to fig. 1, 7 and 8, the winding core 10 includes four edges, and the positive electrode tab 13 and the negative electrode tab 14 are respectively disposed at two adjacent edges of the winding core 10.
Specifically, the winding core 10 is rectangular, and includes four edges, namely an edge 01, an edge 02, an edge 03 and an edge 04, where each edge can be provided with a positive electrode tab 13 or a negative electrode tab 14. By adopting the positive electrode tab 11 and the negative electrode tab 12 of different intermittent coating methods, the winding core 10 in which the positive electrode tab 13 or the negative electrode tab 14 is arranged at different edges can be obtained, but the positive electrode tab 13 and the negative electrode tab 14 can be arranged only at two adjacent edges of the winding core 10.
Optionally, fig. 9 is a schematic view of an initial position of folding a lithium ion battery according to an embodiment of the present utility model, fig. 10 is a schematic view of an initial position of folding a further lithium ion battery according to an embodiment of the present utility model, and fig. 11 is a schematic view of an initial position of folding a further lithium ion battery according to an embodiment of the present utility model. With continued reference to fig. 1, 7 and 8, based on the above embodiments, the winding core 10 includes two positive electrode tabs 13 and one negative electrode tab 14; the negative electrode tab 14 is arranged at one edge of the winding core 10, and the two positive electrode tabs 13 are respectively arranged at two edges adjacent to the negative electrode tab 14 in the winding core 10;
alternatively, the winding core 10 includes one positive electrode tab 13 and two negative electrode tabs 14; the positive electrode tab 13 is arranged at one edge of the winding core 10, and the two negative electrode tabs 14 are respectively arranged at two edges adjacent to the positive electrode tab 13 in the winding core 10;
alternatively, the winding core 10 includes a positive tab 13 and a negative tab 14; the positive electrode tab 13 is disposed at an edge of the winding core 10, and the negative electrode tab 14 is disposed at an edge of the winding core 10 adjacent to the positive electrode tab 13.
Specifically, when the plurality of first negative electrode folding regions 1221 and the plurality of second negative electrode folding regions 1222 are intermittently arranged, and the negative electrode tab 12 having both ends set as the second negative electrode folding regions 1222 in the unfolded state is adopted, the plurality of positive electrode tabs 11 intermittently arranged with the plurality of first positive electrode folding regions 1121 are adopted, the positive electrode tab 11 and the negative electrode tab 12 are placed in the initial positions according to fig. 9, wherein the negative electrode tab 12 is under the positive electrode tab 11. The lithium ion battery structure shown in fig. 1 can be obtained by cross folding, namely, the lithium ion battery structure comprises a group of negative electrode lugs 14 and two groups of positive electrode lugs 13. One set of negative electrode tabs 14 is disposed at the edge 01 of the winding core 10, and two sets of positive electrode tabs 13 are disposed at the edges 02 and 04 of the winding core 10, respectively.
When the plurality of first anode folding regions 1221 and the plurality of second anode folding regions 1122 are intermittently arranged, and the plurality of first anode folding regions 1121 and the plurality of second anode folding regions 1122 are intermittently arranged, and the anode tab 11 and the cathode tab 12 are disposed at both ends of the anode tab 11 in the unfolded state as the anode tab 11 of the second anode folding region 1122, the anode tab 11 and the cathode tab 12 are disposed at the initial positions according to fig. 10, wherein the cathode tab 12 is under the anode tab 11. The lithium ion battery structure shown in fig. 7, that is, the structure including two sets of negative electrode tabs 14 and one set of positive electrode tabs 13, can be obtained by cross folding. Two sets of negative electrode tabs 14 are respectively disposed at the edge 01 and the edge 03 of the winding core 10, and one set of positive electrode tabs 13 is disposed at the edge 02 of the winding core 10.
When the plurality of first anode folding regions 1221 and the plurality of second anode folding regions 1222 are intermittently arranged, and the anode electrode tab 12 whose both ends are set as the second anode folding regions 1222 in the unfolded state is intermittently arranged, the plurality of first cathode folding regions 1121 and the plurality of second cathode folding regions 1122 are intermittently arranged, and the both ends are set as the cathode electrode tab 11 of the second cathode folding regions 1122 in the unfolded state, the cathode electrode tab 11 and the anode electrode tab 12 are placed at the initial positions of fig. 11, wherein the anode electrode tab 12 is under the cathode electrode tab 11. The lithium ion battery structure shown in fig. 8, that is, the lithium ion battery structure includes a set of negative electrode tabs 14 and a set of positive electrode tabs 13, can be obtained by cross folding. Wherein, a set of negative electrode tabs 14 are disposed at the edge 01 of the winding core 10, and a set of positive electrode tabs 13 are disposed at the edge 02 of the winding core 10.
Alternatively, on the basis of the above embodiments, a plurality of positive electrode tabs 13 are stacked to be welded to form a positive electrode of a lithium ion battery; the plurality of negative electrode tabs 14 are stacked to be welded to form a negative electrode of the lithium ion battery.
Specifically, by cross-folding the positive electrode sheet 11, a plurality of positive electrode tabs 13 whose vertical projections are completely overlapped are formed, and the plurality of positive electrode tabs 13 are stacked. The plurality of positive electrode lugs 13 can be welded to the cover plate of the lithium ion battery through one-time welding process, so that the positive electrode of the lithium ion battery is formed. Similarly, the cross-folded negative electrode tab 12 also has a plurality of stacked negative electrode tabs 14, and the vertical projections of the negative electrode tabs 14 are completely overlapped. Each negative electrode tab 14 can be welded to a cover plate of a lithium ion battery by a one-time welding process, thereby forming a negative electrode of the lithium ion battery.
Alternatively, fig. 12 is a schematic cross-sectional structure diagram of a composite structure of a negative electrode plate and an insulating separator layer of a lithium ion battery according to an embodiment of the present utility model. On the basis of the above embodiments, referring to fig. 2 and 12, the lithium ion battery further includes: an insulating separator layer 15; the insulating separator layer 15 is disposed between each of the positive electrode tab 11 and the negative electrode tab 12 adjacently arranged in the lithium ion battery.
Specifically, taking the negative electrode sheet 12 as an example, the negative electrode material regions 121 are formed by intermittently coating a negative electrode material on the surface of the copper foil, and a negative electrode blank region 122 is formed between two adjacent negative electrode material regions 121. The anode blank area 122 with a larger width is a first anode folding area 1221, and is used for folding to form an anode tab 14; the negative blank area 122 with smaller width is a second negative folding area 1222, which is used for folding to completely overlap the vertical projections of the two adjacent negative material areas 121. Fig. 11 shows a cross-sectional view of the negative electrode tab showing a structure in which the negative electrode blank 122 includes only a plurality of first negative electrode folded regions 1221. An insulating diaphragm layer 15 is arranged on the surface of one side, far away from the copper foil, of the negative electrode material region 121, and a positive electrode plate 11 is arranged on one side, far away from the negative electrode material region 121, of the insulating diaphragm layer 15. The insulating membrane layer 15 is used for isolating the positive electrode plate 11 from the negative electrode plate 12, so that the positive electrode plate 11 and the negative electrode plate 12 are insulated.
The above embodiments do not limit the scope of the present utility model. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included in the scope of the present utility model.
Claims (10)
1. A lithium ion battery, comprising: n winding cores which are adjacently arranged, wherein the winding cores are connected in parallel; wherein n is an integer greater than or equal to 2;
the winding core comprises: a positive pole piece and a negative pole piece; the positive pole piece and the negative pole piece are folded in a crossing way to form the winding core with a laminated structure, the part of the positive pole piece, which is folded and protrudes out of the edge of the winding core, is a positive pole lug, and the part of the negative pole piece, which is folded and protrudes out of the edge of the winding core, is a negative pole lug;
at least part of the positive electrode lugs and/or at least part of the negative electrode lugs are V-shaped.
2. The lithium ion battery of claim 1, wherein the positive electrode sheet comprises a plurality of positive electrode material areas and a plurality of positive electrode blank areas, the plurality of positive electrode material areas and the plurality of positive electrode blank areas being intermittently arranged along an extending direction in which the positive electrode sheet is in an expanded state;
the negative electrode plate comprises a plurality of negative electrode material areas and a plurality of negative electrode blank areas, and the negative electrode material areas and the negative electrode blank areas are intermittently arranged along the extending direction of the negative electrode plate in an unfolding state;
the positive electrode material region is used for bearing a coated positive electrode material, and the negative electrode material region is used for bearing a coated negative electrode material; the positive pole blank area is used for reserving an area for folding the positive pole piece, and the negative pole blank area is used for reserving an area for folding the negative pole piece.
3. The lithium ion battery of claim 2, wherein the plurality of positive electrode blank areas comprises a plurality of first positive electrode fold areas; the first positive electrode folding area is used for folding to form the positive electrode lug;
the plurality of first positive electrode folding areas are sequentially arranged along the extending direction of the positive electrode plate in an unfolding state, and two ends of the positive electrode plate are respectively provided with half of the first positive electrode folding areas;
or the positive electrode blank areas comprise a plurality of first positive electrode folding areas and a plurality of second positive electrode folding areas;
the first positive electrode folding areas and the second positive electrode folding areas are intermittently arranged along the extending direction of the positive electrode plate in an unfolding state, and two ends of the positive electrode plate are provided with half of the first positive electrode folding areas.
4. The lithium ion battery of claim 3, wherein a plurality of the negative electrode whitespace regions comprise: a plurality of first negative electrode folding regions; the first negative electrode folding area is used for folding to form the negative electrode tab;
the plurality of first negative electrode folding areas are sequentially arranged along the extending direction of the negative electrode plate in an unfolding state, and two ends of the negative electrode plate are respectively provided with half of the first negative electrode folding areas;
alternatively, the plurality of negative electrode blank areas include: a plurality of the first anode folding regions and a plurality of the second anode folding regions; the plurality of first negative electrode folding areas and the plurality of second negative electrode folding areas are intermittently arranged along the extending direction of the negative electrode plate in an unfolding state, and the second negative electrode folding areas are arranged at two ends of the negative electrode plate.
5. The lithium ion battery of claim 4, wherein the width of the first positive electrode fold region is greater than the width of the second positive electrode fold region, and the width of the first positive electrode fold region is less than the width of the positive electrode tab;
the width of the first negative electrode folding zone is larger than that of the second negative electrode folding zone, and the width of the first negative electrode folding zone is smaller than that of the negative electrode pole piece.
6. The lithium ion battery of claim 4, wherein the top tip of the positive electrode tab corresponds to a center line position of the first positive electrode folding region perpendicular to the extending direction of the positive electrode piece in the unfolded state, and two bottom supporting ends of the positive electrode tab are connected with two adjacent positive electrode material regions;
the top tip of the negative electrode tab corresponds to the position of the first negative electrode folding region perpendicular to the central line of the extending direction of the negative electrode pole piece in the unfolding state, and two bottom supporting ends of the negative electrode tab are connected with two adjacent negative electrode material regions.
7. The lithium ion battery of claim 1, wherein the winding core comprises four edges, and the positive electrode tab and the negative electrode tab are respectively disposed at two adjacent edges of the winding core.
8. The lithium ion battery of claim 7, wherein the jellyroll comprises two of the positive electrode tabs and one of the negative electrode tabs; the negative electrode tab is arranged at one edge of the winding core, and the two positive electrode tabs are respectively arranged at two edges, adjacent to the negative electrode tab, of the winding core;
or the winding core comprises one positive electrode tab and two negative electrode tabs; the positive electrode tab is arranged at one edge of the winding core, and the two negative electrode tabs are respectively arranged at two edges, adjacent to the positive electrode tab, of the winding core;
or the winding core comprises the positive electrode tab and the negative electrode tab; the positive electrode tab is arranged at one edge of the winding core, and the negative electrode tab is arranged at the edge of the winding core adjacent to the positive electrode tab.
9. The lithium ion battery of claim 1, wherein a plurality of the positive electrode tabs are stacked to be welded to form a positive electrode of the lithium ion battery; and a plurality of negative electrode lugs are stacked and connected into the negative electrode of the lithium ion battery by welding.
10. The lithium ion battery of claim 1, further comprising: an insulating separator layer; the insulating diaphragm layer is arranged between the positive pole piece and the negative pole piece which are adjacently arranged in the lithium ion battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320063941.4U CN219534810U (en) | 2023-01-09 | 2023-01-09 | Lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320063941.4U CN219534810U (en) | 2023-01-09 | 2023-01-09 | Lithium ion battery |
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| Publication Number | Publication Date |
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| CN219534810U true CN219534810U (en) | 2023-08-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202320063941.4U Active CN219534810U (en) | 2023-01-09 | 2023-01-09 | Lithium ion battery |
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| Country | Link |
|---|---|
| CN (1) | CN219534810U (en) |
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2023
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