CN218788389U - Battery with a battery cell - Google Patents
Battery with a battery cell Download PDFInfo
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- CN218788389U CN218788389U CN202223183061.5U CN202223183061U CN218788389U CN 218788389 U CN218788389 U CN 218788389U CN 202223183061 U CN202223183061 U CN 202223183061U CN 218788389 U CN218788389 U CN 218788389U
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- 238000004804 winding Methods 0.000 claims description 45
- 238000002955 isolation Methods 0.000 claims description 12
- 238000005192 partition Methods 0.000 claims 3
- 239000011149 active material Substances 0.000 abstract description 7
- 238000000576 coating method Methods 0.000 abstract description 6
- 239000011248 coating agent Substances 0.000 abstract description 5
- 239000000758 substrate Substances 0.000 description 12
- 238000005520 cutting process Methods 0.000 description 8
- 238000005452 bending Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 239000013543 active substance Substances 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000004033 plastic Substances 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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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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Abstract
The application discloses battery, the pole piece of this battery is through setting up first recess, and set up the at least part of utmost point ear in the first recess that corresponds, the length of utmost point ear for the protruding portion of pole piece body has been reduced, thereby the difference in height between the top of utmost point ear and the pole piece body top has been reduced, therefore, the battery region that originally the difference in height corresponds in the battery can be effectively utilized, the area of pole piece body has been increased, thereby the active material's on the pole piece body coating region increases, can effectively improve the space utilization of battery, promote battery energy density.
Description
Technical Field
The application relates to the technical field of batteries, in particular to a battery.
Background
The new energy automobile is an automobile which adopts unconventional automobile fuel as a power source (or adopts conventional automobile fuel and a novel vehicle-mounted power device), integrates advanced technologies in the aspects of power control and driving of the automobile, and is advanced in technical principle, novel in technology and novel in structure. At present, with the development of new energy automobiles, the endurance mileage and the safety performance become limiting factors for limiting the rapid popularization of new energy automobiles, so that the improvement of the endurance mileage becomes the key for the development of the power battery industry.
The power battery winding core generally comprises a diaphragm and two pole pieces with opposite polarities, the diaphragm is positioned between the two pole pieces, the two pole pieces and the diaphragm are sequentially stacked and wound to form a winding core structure, an active substance layer is arranged on the pole pieces, the lithium ions are embedded into and de-embedded from the active substance layer to realize the charging and discharging process of the lithium ions, and the pole pieces are connected with an external circuit through pole lugs. However, the height difference exists between the top of the tab and the top of the active material layer, and after the winding core is installed in the battery shell, the battery area corresponding to the height difference cannot be effectively utilized, so that the improvement of the energy density of the battery is not facilitated.
SUMMERY OF THE UTILITY MODEL
Utility model purpose: the embodiment of the application provides a battery, aims at solving and has the difference in height between the top on the utmost point ear of current battery and the top on active substance layer, and the regional unable effective utilization of battery that this difference in height corresponds is unfavorable for promoting battery energy density's technical problem.
The technical scheme is as follows: the battery comprises a winding core, wherein the winding core comprises a plurality of pole pieces and diaphragms which are arranged in a stacked mode, the diaphragms are arranged between two adjacent pole pieces so as to insulate the two adjacent pole pieces, and the polarities of the two adjacent pole pieces are different;
the pole piece includes:
the pole piece comprises a pole piece body, a first electrode and a second electrode, wherein the pole piece body is provided with a first extending direction and a second extending direction which are perpendicular to each other;
the tabs are connected with the pole piece body and at least partially positioned in the first grooves;
the maximum width of the pole piece body in the second extending direction is D 1 The depth of the first groove in the second extending direction is D 2 Wherein D is not less than 0.01 2 /(D 1 -D 2 )≤0.06。
In some embodiments, the length of the tab in the second extending direction is D 3 Wherein D is not less than 0.03 2 /D 3 ≤0.2。
In some embodiments, the depth D of the first groove in the second extension direction 2 Is 1-5 mm.
In some embodiments, the tabs are arranged in one-to-one correspondence with the first grooves;
in the first extending direction, first gaps are respectively arranged between two side edges of the tab and two side edges of the corresponding first groove.
In some embodiments, the width of the tab in the first extending direction is L 1 The width of the first gap in the first extending direction is L 2 Wherein, L is more than or equal to 0.06 2 /L 1 ≤0.08。
In some embodiments, the pole piece body comprises a current collector and an active body coated on the current collector, wherein the active body is further coated on a part of the tab located in the first groove, and exposes a part of the tab located outside the first groove.
In some embodiments, a plurality of second grooves are formed in one side edge of the pole piece body in the second extending direction, and the second grooves are arranged at intervals along the first extending direction;
in a third direction, the second groove of one pole piece is arranged side by side with the first groove of another adjacent pole piece, and the third direction is perpendicular to the first extending direction and the second extending direction.
In some embodiments, the septum comprises:
the diaphragm body is provided with a plurality of third grooves at one side edge in the second extending direction, and the third grooves are arranged at intervals along the first extending direction;
in the third direction, the third grooves are correspondingly arranged between the first grooves and the second grooves one by one; and/or the presence of a gas in the atmosphere,
in the third direction, the first grooves of the two pole pieces with the same polarity are arranged side by side.
In some embodiments, the septum further comprises:
the isolating parts are arranged in one-to-one correspondence to the third grooves, are connected with the diaphragm body and are at least partially positioned in the third grooves;
in the first extending direction, a second gap is formed between two side edges of the isolating part and two side edges of the corresponding third groove.
In some embodiments, the width of the isolation portion in the first extending direction is L 3 The width of the tab in the first extending direction is L 1 Wherein, L 3 ≥L 1 。
In some embodiments, the battery further comprises:
the winding core comprises a shell and a top cover, wherein the top cover is connected with the shell and encloses an accommodating space, and the winding core is arranged in the accommodating space;
and one side of the top cover facing the accommodating space is provided with an insulating part, and the insulating part is in contact with the pole piece body.
Has the advantages that: compared with the prior art, the battery of the embodiment of the application comprises a winding core, wherein the winding core comprises a plurality of pole pieces and diaphragms which are arranged in a stacked mode, the diaphragms are arranged between two adjacent pole pieces so as to insulate the two adjacent pole pieces, and the two adjacent pole pieces are different in polarity; the pole piece includes: a pole piece body having a first extending direction and a second extending direction perpendicular to each other, one side of the pole piece body in the second extending directionThe edge is provided with a plurality of first grooves which are arranged at intervals along the first extending direction; the tabs are connected with the pole piece body and at least partially positioned in the first grooves; the maximum width of the pole piece body in the second extending direction is D 1 The depth of the first groove in the second extending direction is D 2 Wherein D is not less than 0.01 2 /(D 1 -D 2 ) Less than or equal to 0.06. The pole piece of this battery is through setting up first recess to set up the at least part of utmost point ear in the first recess that corresponds, the length of utmost point ear for the salient of pole piece body has been reduced, thereby the difference in height between the top of utmost point ear and the pole piece body top has been reduced, consequently, the battery region that originally the difference in height corresponds in the battery can be effectively utilized, the area of pole piece body has been increased, thereby the active material's on the pole piece body coating region increases, can effectively improve the space utilization of battery, promote battery energy density.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a pole piece according to a first embodiment of the present application;
fig. 2 is a schematic structural diagram of a pole piece according to a second embodiment of the present application;
FIG. 3 is a schematic view of a portion of the area A in FIG. 2;
FIG. 4 is a schematic view of a core structure provided in an embodiment of the present application;
FIG. 5 is a schematic view of another core structure provided by an embodiment of the present application;
fig. 6 is a schematic diagram of an exploded structure of a unwound winding core according to an embodiment of the present application;
FIG. 7 is a partially enlarged view of the area B in FIG. 6;
FIG. 8 is a schematic front view of a winding core according to a first embodiment of the present application;
FIG. 9 is a schematic front view of a winding core according to a second embodiment of the present application;
fig. 10 is a schematic structural diagram of a battery provided in an embodiment of the present application;
FIG. 11 is a schematic view of a process for preparing a pole piece according to an embodiment of the present disclosure;
fig. 12 is a schematic view of another manufacturing process of a pole piece according to an embodiment of the present disclosure;
fig. 13 is a schematic structural diagram of a square power battery in the prior art;
reference numerals: 1-a substrate; 10-a winding core; 100-pole piece; 100 a-positive plate; 100 b-negative plate; 110-a pole piece body; 110 a-positive plate body; 110b negative electrode plate body; 111-a first recess; 112-an active body; 113-a second recess; 114-a first gap; 120-pole ear; 120 a-positive tab; 120 b-negative tab; 200-a membrane; 210-a diaphragm body; 211-third recess; 212-a second gap; 220-a spacer; 300-a housing; 400-a top cover; 500-an insulator; 600-connecting piece.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it should be noted that unless otherwise explicitly stated or limited, the terms "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships that are based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience in describing the present application and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore should not be construed as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of the present application, "a plurality" means two or more, and at least one means may be one, two or more unless specifically limited otherwise. In the description of the present application, the terms "mounted", "connected" and "connected" should be interpreted broadly, and may be, for example, a fixed connection, a detachable connection, or an integral connection; may be mechanically, electrically or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
The applicant notices that the current power battery is mainly a square battery, and as shown in fig. 13, the current power battery comprises a square aluminum shell, a winding core positioned in the square aluminum shell, a top cover fixed on the square aluminum shell, and a lower plastic arranged between the winding core and the top cover. The utmost point ear of rolling up the core is the complete protrusion in the pole piece body, and this makes to have the difference in height between the top of utmost point ear and the top of pole piece body, and after rolling up the core and pack into square aluminum hull, the battery area that the difference in height corresponds can't effectively be utilized, is unfavorable for promoting battery energy density. And meanwhile, a winding core is fixed by lower plastic, and the lower plastic is utilized to provide mounting space for the lug and the connecting sheet, so that the weight of the battery is increased.
In view of the above, the present disclosure provides a battery to solve at least one of the above problems. The battery comprises a winding core 10, wherein the winding core 10 comprises a plurality of pole pieces 100 and a diaphragm 200 which are arranged in a stacked mode, the diaphragm 200 is arranged between two adjacent pole pieces 100 so as to insulate the two adjacent pole pieces 100, and the polarities of the two adjacent pole pieces 100 are different.
Specifically, please refer to fig. 1 and fig. 2 together, in which fig. 1 illustrates a structure of a pole piece 100 provided in a first embodiment of the present application, and fig. 2 illustrates a structure of a pole piece 100 provided in a second embodiment of the present application; the pole piece 100 includes a pole piece body 110 and a plurality of tabs 120 connected to the pole piece body 110.
The pole piece body 110 has a first extending direction X and a second extending direction Y that are perpendicular to each other, a plurality of first grooves 111 are disposed on one side edge of the pole piece body 110 in the second extending direction Y, and the plurality of first grooves 111 are arranged at intervals along the first extending direction X.
It should be noted that the first extending direction X is determined according to the installation state of the pole piece 100, and in the winding core 10 of the lamination structure, or when the pole piece 100 of the winding core 10 of the winding structure is unfolded, the pole piece body 110 extends along a straight line, and the first extending direction X is the length direction of the pole piece body 110; in the winding core 10 of the winding structure, the first extending direction X is the winding direction of the pole piece 100; correspondingly, the second extending direction Y is the width direction of the pole piece 100.
The tab 120 is connected to one side edge of the pole piece body 110 in the second extending direction Y, the tabs 120 are arranged at intervals in the first extending direction X and correspond to the first grooves 111 one by one, and at least part of the tab 120 is located in the first groove 111; that is, in the second extending direction Y, the tab 120 extends from the bottom edge of the first groove 111 toward the opening direction of the first groove 111.
More specifically, in the embodiment of the present application, the pole piece 100 satisfies:
0.01≤D 2 /(D 1 -D 2 )≤0.06
wherein D is 1 The maximum width of the pole piece body 110 in the second extending direction Y; d 2 Is the depth of the first groove 111 in the second extension direction Y.
It can be understood that, this pole piece 100 is through setting up first recess 111, and set up at least part of utmost point ear 120 in corresponding first recess 111, the length of the salient of utmost point ear 120 for pole piece body 110 has been reduced, thereby the difference in height between the top of utmost point ear 120 and the pole piece body 110 top has been reduced, after the casing of battery is packed into to the book core 10 with this pole piece 100 preparation, the battery area that originally the difference in height corresponds can be effectively utilized, the area of pole piece body 110 has been increased, thereby the coating area of the active material on the pole piece body 110 increases, can effectively improve the space utilization of battery, promote battery energy density.
For the conventional pole piece in the prior art, D 2 =0mm, i.e. the tab of a conventional pole piece is completely convex with respect to the pole piece body.
In contrast, in the present embodiment D 2 Greater than 0mm, for example, in some embodiments the depth D of the first groove 111 in the second direction of extension Y 2 Satisfies the following conditions: 0 < D 2 Less than or equal to 5mm in unit mm; for example, D is taken for the pole piece 100 of the present embodiment as well as the conventional pole piece described above 1 -D 2 =100mm, then D is 2 When the thickness is 1mm, the area of the pole piece body 110 in this embodiment is increased by about 1% compared to the conventional pole piece, and the capacity of the winding core 10 can be increased by about 1%; when D is present 2 When the thickness is not less than 2mm, the area of the pole piece body 110 in this embodiment is increased by about 2% compared to the conventional pole piece, and the capacity of the winding core 10 can be increased by about 2%; when D is present 2 When =3mm, the area of the pole piece body 110 in this embodiment is increased by about 3% compared with the conventional pole piece, and the capacity of the winding core 10 can be increased by about 3%; when D is 2 When =4mm, the area of the pole piece body 110 in this embodiment is increased by about 4% compared with the conventional pole piece, and the capacity of the winding core 10 can be increased by about 4%; when D is present 2 If =5mm, the area of the pole piece body 110 in the present embodiment is increased by about 5% compared with the conventional pole piece, and the capacity of the winding core 10 can be increased by about 5%. Therefore, the pole piece 100 in this embodiment can improve the capacity of the winding core 10 by 1 to 5%.
Further, pole piece 100 also satisfies:
0.03≤D 2 /D 3 ≤0.2
wherein D is 3 The length of the tab 120 in the second extending direction Y.
In some embodiments, the length D of the tab 120 may be determined according to 3 Determining the depth of the first groove 111Degree D 2 To ensure that most of the tabs 120 are located in the corresponding first grooves 111, thereby reducing the length of the portion of the tabs 120 protruding from the pole piece body 110 in the second extending direction Y, reducing the space occupation of the portion of the tabs 120, and correspondingly being able to make the maximum width D of the pole piece body 110 1 The larger the area of the pole piece body 110, the larger the area of the active material, thereby increasing the energy density of the roll core 10.
In some embodiments, the depth D of the first groove 111 in the second extension direction Y 2 1 to 5mm, i.e. D 2 The thickness can be arbitrarily selected from the range of 1 to 5mm, and for example, it can be 1mm, 2mm, 3mm, 4mm, or 5mm.
In some embodiments, the maximum width of the pole piece body 110 in the second extending direction Y is D 1 Is 94 to 98mm, namely D 2 The thickness can be arbitrarily selected from the range of 94 to 98mm, and can be, for example, 94mm, 95mm, 96mm, 97mm, or 98mm.
Referring to fig. 3, fig. 3 illustrates a partial enlarged structure of the area a in fig. 2, in some embodiments, in the first extending direction X, a first gap 114 is formed between two side edges of the tab 120 and two side edges of the corresponding first groove 111, and the first gap 114 is located at two sides of the tab 120, it can be understood that the first gap 114 is a portion of the first groove 111. Through setting up first clearance 114 for the both sides of utmost point ear 120 do not contact with pole piece body 110, avoid pole piece body 110 to produce the constraint or hinder to utmost point ear 120 in both sides, make utmost point ear 120 bend along the thickness direction of pole piece 100 more easily, thereby be favorable to when preparing the battery, each utmost point ear 120 and connection piece 600 weld mutually, reduce the welded degree of difficulty.
Further, pole piece 100 also satisfies:
0.06≤L 2 /L 1 ≤0.08
wherein L is 1 Is the width, L, of the tab 120 in the first extending direction X 2 Is the width of the first gap 114 in the first extension direction X. The width ratio of the two is set in the range, and on one hand, the width ratio can be set according to the width L of the tab 120 1 Determining a width L of the first gap 2 Satisfy the tab120 for the tab 120 has sufficient strength, avoiding the occurrence of breakage, and meanwhile, also meeting the space requirement for bending the tab 120, avoiding the obstruction of the pole piece bodies 110 on both sides to the tab, especially in the winding core 10, there may be a certain degree of dislocation between the tabs 120, and the width L of the first gap 114 is set 2 The requirements are met, and the spatial interference of the pole piece body 110 to the pole lug 120 after dislocation can be effectively avoided; on the other hand, the space occupied by the first groove 111 can be reduced as much as possible, and accordingly, the area of the pole piece body 110 is increased, and therefore the energy density is improved.
In some embodiments, the width L of the tab 120 in the first extending direction X 1 38 to 48mm, i.e. L 1 The thickness can be arbitrarily selected from the range of 38 to 48mm, and for example, 38mm, 39mm, 40mm, 41mm, 42mm, 43mm, 44mm, 45mm, 46mm, 47mm, and 48mm can be used.
In some embodiments, the width L of the first gap 114 in the first direction of extension 2 Is 3-5 mm, i.e. L 2 The thickness may be arbitrarily selected from the range of 3 to 5mm, and may be, for example, 3mm, 4mm or 5mm.
Referring to fig. 1 again, in the first embodiment, the pole piece body 110 includes a current collector and an active body 112 coated on the current collector, the active body 112 is an active material, and the active body 112 is further coated on a portion of the tab 120 located in the first groove 111 and exposes a portion of the tab 120 located outside the first groove 111. Because the part of the tab 120, which is positioned outside the first groove 111, is not coated with the active body 112, ultrasonic welding between the tabs 120 and between the tab 120 and the connecting sheet 600 can be realized through the part, and the part of the active body 112 coated in the first groove 111 increases the coating area of the active body 112 to a certain extent, so that the energy density of the winding core 10 can be improved; in addition, the process of washing away the active bodies 112 on the tab 120 can be reduced, thereby reducing process consumption.
In the second embodiment, different from the first embodiment, the active body 112 is not coated on the portion of the tab 120 located in the first groove 111, so that the phenomenon that the active body 112 falls off during the bending of the tab 120 can be avoided.
In some embodiments, the first grooves 111 are arranged at equal intervals, and the tabs 120 are arranged at equal intervals, so that the first grooves 111 and the tabs 120 can be aligned with each other and then led out together when the winding core 10 is prepared.
Correspondingly, the embodiment of the present application further provides a winding core 10, where the winding core 10 includes the above-mentioned pole piece 100; and a diaphragm 200, the diaphragm 200 being disposed between two adjacent pole pieces 100 to insulate the two adjacent pole pieces 100; wherein, the polarities of two adjacent pole pieces 100 are different.
It will be understood that the winding core 10 may include all the technical features and advantages of the pole piece 100 described above, which are not described in detail herein.
Referring to fig. 4 and 5, fig. 4 and 5 illustrate two winding core 10 structures, wherein fig. 4 uses a positive electrode sheet 100a, a negative electrode sheet 100b and two separators 200 for winding and forming, and fig. 5 uses a separator 200 for laminating a plurality of positive electrode sheets 100a and a plurality of negative electrode sheets 100 b.
Referring to fig. 6, fig. 6 illustrates an exploded structure of the unwound roll core 10 according to the embodiment of the present application; as can be seen, a plurality of second grooves 113 are formed in one side edge of the pole piece body 110 in the second extending direction Y, and the plurality of second grooves 113 are arranged at intervals along the first extending direction X; in the third direction Z, the second grooves 113 of the positive electrode tab 100a are arranged side by side with the first grooves 111 of the adjacent negative electrode tab 100b, and the third direction Z is perpendicular to the first extending direction X and the second extending direction Y. Through setting up second recess 113, for the utmost point ear 120 of adjacent pole piece 100 provides the space that can bend, especially, to the part that utmost point ear 120 is located first recess 111, can not be tied by adjacent pole piece 100 during bending, can not influence bending of utmost point ear 120 to connect utmost point ear 120 more easily, reduce welding process's the degree of difficulty.
Further, referring to fig. 6 and 7 together, fig. 7 illustrates a partially enlarged structure of a region B in fig. 6. In some embodiments, the diaphragm 200 includes a diaphragm body 210, one side edge of the diaphragm body 210 in the second extending direction Y is provided with a plurality of third grooves 211, and the plurality of third grooves 211 are arranged at intervals along the first extending direction X; in the third direction Z, the third grooves 211 are disposed between the first grooves 111 and the second grooves 113 in a one-to-one correspondence.
It is to be understood that referring to fig. 8, fig. 8 illustrates a front view structure of a core 10 provided in the first embodiment of the present application; the third groove 211 is formed in the diaphragm body 210, and the third groove 211 is located between the first groove 111 and the second groove 113 of the adjacent pole piece 100 in the third direction Z, so that a space is provided for bending the pole lug 120, spatial interference caused by bending the pole lug 120 by the diaphragm 200 is avoided, and welding of the pole lug 120 is facilitated.
Further, in some embodiments, the diaphragm 200 further includes a plurality of isolation portions 220, the isolation portions 220 are connected to one side edge of the diaphragm body 210 in the second extending direction Y, the isolation portions 220 are arranged at intervals in the first extending direction X and are disposed in one-to-one correspondence with the third recesses 211, at least a portion of the isolation portion 220 is located in the third recess 211, and two side edges of the isolation portion 220 and two side edges of the corresponding third recess 211 have the second gap 212 in the first extending direction X.
It is to be understood that referring to fig. 9, fig. 9 illustrates a front view structure of a core 10 provided in a second embodiment of the present application; through setting up isolation part 220, locate isolation part 220 in third recess 211 one-to-one to set up second clearance 212 in isolation part 220's both sides, make isolation part 220 can bend along with utmost point ear 120 is synchronous, can not lead to the fact spatial interference to bending of utmost point ear 120 on the one hand, and on the other hand can keep apart utmost point ear 120 and adjacent pole piece 100, avoids both contacts to cause the short circuit.
Further, in the first extending direction X, the width L of the isolation portion 220 3 Is greater than or equal to the width L of the tab 120 1 Therefore, the isolating part 220 can completely cover the part of the tab 120 located in the first groove 111, so as to prevent the tab 120 from contacting due to deviation in the winding or stacking process of the pole piece 100 to cause short circuit, thereby improving safety.
Referring to fig. 10, fig. 10 illustrates a structure of a battery provided by the embodiment of the present application, where the battery includes the winding core 10; the top cover 400 is connected with the shell 300 and encloses an accommodating space, and the winding core 10 is arranged in the accommodating space;
one side of the top cover 400 facing the accommodating space is provided with an insulating member 500, and the insulating member 500 contacts the pole piece 100. The pole piece 100 extends over the entire height of the receiving space, and the insulating member 500 prevents the pole piece 100 from contacting the top cover 400 to cause a short circuit.
It can be understood that this battery can include all technical features and beneficial effects of the above-mentioned book core 10, especially, through being located corresponding first recess 111 at least partly utmost point ear 120, utmost point ear 120 is located first recess 111 completely after buckling, and pole piece body 110 can be direct with insulating part 500 butt to the battery need not down the plastic to carry on spacingly to rolling up core 10, has not only lightened battery weight, has still promoted the energy density of battery.
As shown in fig. 11 and 12, an embodiment of the present application further provides a method for manufacturing a pole piece 100, where the method includes:
providing a substrate 1, wherein the substrate 1 is a current collector material, and coating an active substance on a partial area of the substrate 1 to form an active body 112; the active material may be coated on one side or both sides.
In the first embodiment (shown in fig. 12), the active body 112 is coated on a partial region of the substrate 1, and the active body 112 is also coated on a region corresponding to the first recess 111, so that a linear boundary line is formed between the coated region and the uncoated region; the linear boundary line is convenient for a user to coat, and the coating process is simple and convenient.
Through die cutting, a plurality of tabs 120 and first gaps 114 positioned at two sides of each tab 120 are formed on the base material 1 at the same time; it will be appreciated that the two first gaps 114 and the area occupied by the tab 120 together form the first groove 111. Specifically, a portion of the substrate 1 is removed by die cutting, a portion of the substrate 1 not coated with the active body 112 is removed by die cutting, a portion of the substrate 1 coated with the active body 112 is removed by die cutting on both sides of the remaining substrate 1 not coated with the active body 112 to form a first gap 114, and simultaneously, the tab 120 is formed, and a portion of the tab 120 located in the first groove 111 is coated with the active body 112, and a portion located outside the first groove 111 is not coated with the active body 112.
Further, the active body 112 on the tab 120 can be removed by means of laser cleaning, so as to form the pole piece 100 structure of the second embodiment. The active body 112 on the tab 120 is directly removed by laser cleaning, so that the active body 112 on the tab 120 can be prevented from falling off after the tab 120 is bent.
In the second embodiment, the active body 112 is coated on a partial area of the substrate 1, and a corresponding area of the first recess 111 is reserved such that a serrated boundary line is formed between the coated area and the uncoated area; the zigzag boundary lines enable the active bodies 112 not to be coated on the tabs 120 formed by die cutting, laser cleaning is not needed, and the production process is saved.
Through die cutting, a plurality of tabs 120 and first gaps 114 positioned at two sides of each tab 120 are formed on the base material 1 at the same time; it will be appreciated that the two first gaps 114 and the area occupied by the tab 120 together form the first groove 111. Specifically, a portion of the substrate 1 not coated with the active body 112 is removed by a die cutting manner, and a portion of the substrate 1 coated with the active body 112 is removed by a die cutting manner corresponding to the reserved first groove 111 region to form a first gap 114 and simultaneously form the tab 120.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to the related descriptions of other embodiments.
The battery provided by the embodiment of the present application is introduced in detail, and a specific example is applied to explain the principle and the implementation manner of the present application, and the description of the embodiment is only used to help understanding the technical scheme and the core idea of the present application; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present disclosure as defined by the appended claims.
Claims (10)
1. A battery, characterized by comprising a winding core (10), wherein the winding core (10) comprises a plurality of pole pieces (100) and a diaphragm (200) which are arranged in a stacked manner, the diaphragm (200) is arranged between two adjacent pole pieces (100) to insulate the two adjacent pole pieces (100), and the two adjacent pole pieces (100) have different polarities;
the pole piece (100) comprises:
the pole piece comprises a pole piece body (110), wherein the pole piece body (110) is provided with a first extending direction (X) and a second extending direction (Y) which are perpendicular to each other, a plurality of first grooves (111) are formed in one side edge of the pole piece body (110) in the second extending direction (Y), and the first grooves (111) are arranged at intervals along the first extending direction (X);
the tabs (120) are connected with the pole piece body (110), and at least part of the tabs (120) are positioned in the first grooves (111);
the maximum width of the pole piece body (110) in the second extension direction (Y) is D 1 The depth of the first groove (111) in the second direction of extension (Y) is D 2 Wherein D is not less than 0.01 2 /(D 1 -D 2 )≤0.06。
2. The battery according to claim 1, characterized in that the length of the tab (120) in the second direction of extension (Y) is D 3 Wherein D is not less than 0.03 2 /D 3 Less than or equal to 0.2; and/or the presence of a gas in the atmosphere,
a depth D of the first groove (111) in the second direction of extension (Y) 2 Is 1-5 mm.
3. The battery according to claim 1, wherein the tabs (120) are disposed in one-to-one correspondence with the first grooves (111);
in the first extending direction (X), a first gap (114) is arranged between two side edges of the tab (120) and two side edges of the corresponding first groove (111).
4. Battery according to claim 3, characterized in that the width of the tab (120) in the first direction of extension (X) is L 1 A width of the first gap (114) in the first direction of extension (X) is L 2 Wherein, L is more than or equal to 0.06 2 /L 1 ≤0.08。
5. The battery according to claim 1, wherein the pole piece body (110) comprises a current collector and an active body (112) coated on the current collector, the active body (112) being further coated on a portion of the tab (120) located inside the first groove (111) and exposing a portion of the tab (120) located outside the first groove (111).
6. The battery according to claim 1, wherein one side edge of the pole piece body (110) in the second extending direction (Y) is provided with a plurality of second grooves (113), and the plurality of second grooves (113) are arranged at intervals along the first extending direction (X);
in a third direction (Z), the second groove (113) of one pole piece (100) is arranged side by side with the first groove (111) of another adjacent pole piece (100); wherein the third direction (Z) is perpendicular to the first and second extension directions (X, Y).
7. The battery according to claim 6, wherein the separator (200) comprises:
a diaphragm body (210), wherein a plurality of third grooves (211) are arranged on one side edge of the diaphragm body (210) in the second extending direction (Y), and the third grooves (211) are arranged at intervals along the first extending direction (X);
in the third direction (Z), the third grooves (211) are arranged between the first grooves (111) and the second grooves (113) in a one-to-one correspondence; and/or the presence of a gas in the gas,
in the third direction (Z), the first grooves (111) of two pole pieces (100) with the same polarity are arranged side by side.
8. The battery of claim 7, wherein the separator (200) further comprises:
a plurality of partitions (220), the partitions (220) being disposed in one-to-one correspondence with the third grooves (211), the partitions (220) being connected to the diaphragm body (210) and at least partially located within the third grooves (211);
in the first extending direction (X), a second gap (212) is formed between two side edges of the isolation portion (220) and two side edges of the corresponding third groove (211).
9. The battery according to claim 8, characterized in that the width of the separator (220) in the first direction of extension (X) is L 3 The width of the tab (120) in the first extension direction (X) is L 1 Wherein, L 3 ≥L 1 。
10. The battery of claim 1, further comprising:
the winding core comprises a shell (300) and a top cover (400), wherein the top cover (400) is connected with the shell (300) and encloses an accommodating space, and the winding core (10) is arranged in the accommodating space;
one side, facing the accommodating space, of the top cover (400) is provided with an insulating piece (500), and the insulating piece (500) is in contact with the pole piece body (110).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223183061.5U CN218788389U (en) | 2022-11-28 | 2022-11-28 | Battery with a battery cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223183061.5U CN218788389U (en) | 2022-11-28 | 2022-11-28 | Battery with a battery cell |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218788389U true CN218788389U (en) | 2023-04-04 |
Family
ID=86505849
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223183061.5U Active CN218788389U (en) | 2022-11-28 | 2022-11-28 | Battery with a battery cell |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218788389U (en) |
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2022
- 2022-11-28 CN CN202223183061.5U patent/CN218788389U/en active Active
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Address after: 518000 1-2 Floor, Building A, Xinwangda Industrial Park, No. 18 Tangjianan Road, Gongming Street, Guangming New District, Shenzhen City, Guangdong Province Patentee after: Xinwangda Power Technology Co.,Ltd. Address before: 518107 1-2 Floor, Building A, Xinwangda Industrial Park, No. 18 Tangjianan Road, Gongming Street, Guangming New District, Shenzhen City, Guangdong Province Patentee before: SUNWODA ELECTRIC VEHICLE BATTERY Co.,Ltd. |