CN217719889U - Battery with improved battery capacity - Google Patents
Battery with improved battery capacity Download PDFInfo
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- CN217719889U CN217719889U CN202220995799.2U CN202220995799U CN217719889U CN 217719889 U CN217719889 U CN 217719889U CN 202220995799 U CN202220995799 U CN 202220995799U CN 217719889 U CN217719889 U CN 217719889U
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- 238000004804 winding Methods 0.000 claims description 2
- 239000007788 liquid Substances 0.000 description 9
- 238000003466 welding Methods 0.000 description 6
- 239000000243 solution Substances 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 239000003792 electrolyte Substances 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 210000005069 ears Anatomy 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000006467 substitution reaction 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 utility model provides a battery, include: the shell is enclosed into a cavity; the housing includes a first side end; the battery cell is positioned in the cavity, a first tab and a protrusion extending towards the first side end are arranged on one side, facing the first side end, of the battery cell, and the distance from the side, adjacent to the battery cell, of the first tab to the first side end is larger than the distance from the protrusion to the first side end; the number of the protrusions is at least two, and the first tab is positioned between two adjacent protrusions; in the width direction of the battery cell, a gap is formed between the first tab and the adjacent protrusion. The utility model discloses can improve the space utilization of battery structure, and then improve the performance such as energy density of battery.
Description
Technical Field
The utility model belongs to the technical field of the battery, concretely relates to battery.
Background
With the rapid development of electronic products in recent years, these electronic products have increasingly high requirements for performance such as battery capacity. The pole piece generally includes pole piece main part and utmost point ear, and present pole piece main part is regular rectangular form structure usually, and the tip is the alignment plane, and in order to make utmost point ear welding in the pole piece main part, utmost point ear generally salient in pole piece main part, with the pole piece encapsulation back this moment, in the packaging body, there is unnecessary space in the left and right sides of utmost point ear, the space loss that causes.
SUMMERY OF THE UTILITY MODEL
The utility model provides a battery, the space region of utmost point ear both sides can make full use of, solves the poor scheduling problem of space utilization of current battery structure to improve the performance such as energy density of battery.
The utility model provides a battery, include: the shell is enclosed into a cavity; the shell comprises a first side end; the battery cell is positioned in the cavity and provided with a first side surface facing the first side end; the first side surface is provided with at least two protrusions and a first tab, and the first tab is positioned between two adjacent protrusions; the distance from one side of the first lug connected with the battery cell to the first side end is greater than the distance from the protrusion to the first side end; in the width direction of the battery cell, a gap is formed between the first tab and the adjacent protrusion.
Further, a projection of the first tab on the first lateral end does not overlap a projection of the protrusion on the first lateral end.
Further, in the width direction of the battery cell, the distance between the first tab and the adjacent protrusion is in a range of 0.3mm to 3mm.
Furthermore, the battery cell comprises a plurality of first pole pieces, a plurality of second pole pieces and a diaphragm, wherein the first pole pieces and the second pole pieces are arranged in a stacked mode, the diaphragm is located between the first pole pieces and the second pole pieces, the first pole lug is arranged on the first pole piece, and the second pole lug is arranged on the second pole piece.
Furthermore, the battery cell also comprises a first insulating layer, and the first insulating layer is positioned in a junction area of the first tab and the battery cell; and/or the battery cell further comprises a second insulating layer, and the second insulating layer is positioned in the junction area of the second pole lug and the battery cell.
Furthermore, the battery cell also comprises a first insulating layer, and the first insulating layer is positioned between the first pole lug and the adjacent second pole lug; and/or the battery cell further comprises a second insulating layer, and the second insulating layer is positioned between the second pole lug and the adjacent first pole piece.
Further, a second tab is further arranged on the first side surface of the battery cell; and/or the projection of the second tab on the first side end does not overlap with the projection of the protrusion on the first side end; and/or the projection of the second tab on the first lateral end does not overlap the projection of the first tab on the first lateral end.
Furthermore, the battery cell further comprises a second side surface which is arranged opposite to the first side surface at intervals, and the second side surface is provided with two protrusions and a second tab.
Further, the second pole ear is positioned between two adjacent protrusions; and/or a protrusion is arranged between the second pole lug and the first pole lug; and/or the distance from the side, connected with the battery cell, of the second lug to the first side end is greater than the distance from the protrusion to the first side end.
Further, the first tab comprises a first connecting part adjacent to the battery cell and a second connecting part connected with the first connecting part; the second connecting parts of the first lugs are sequentially stacked, and the second connecting parts of the first lugs are mutually attached to form a first lug plate.
Further, in the direction from the battery cell to the first side end, the distance from the first pole lug plate to the first side end is less than or equal to the distance from the protrusion to the first side end.
Further, the first tab is a positive tab or a negative tab; and/or the battery cell is a laminated battery cell or a winding battery cell.
The utility model discloses an implement, following beneficial effect has at least:
the utility model provides a battery, one side that electric core was equipped with first utmost point ear is equipped with the protrusion, and one side that first utmost point ear links to each other with electric core is greater than the distance of protrusion to first side to the distance of first side. Therefore, the waste of a cavity space caused by the arrangement of the first lug can be avoided, the spaces on two sides of the lug are fully utilized, the effective area of the battery cell is increased, and the performances of the battery, such as energy density and the like, are improved.
Drawings
Fig. 1 is a schematic structural diagram of a battery according to an embodiment of the present invention at a first viewing angle;
fig. 2 is a schematic structural diagram of a battery according to an embodiment of the present invention at a second viewing angle;
fig. 3 is an enlarged view of a portion of the battery according to an embodiment of the present invention at a second viewing angle;
fig. 4 is an enlarged view of a partial structure of a battery according to an embodiment of the present invention;
description of reference numerals:
1-a shell;
11-a first lateral end;
2-electric core;
21-a first tab;
211-a first connection;
212-a second connection;
22-a second tab;
221-a third connecting portion;
222-a fourth connection;
23-a protrusion;
32-a second insulating layer;
4-a first pole piece;
5-a separator;
6-second pole piece.
Detailed Description
To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the attached drawings in the embodiments of the present invention are combined to clearly and completely describe the technical solution in the embodiments of the present invention, and obviously, the described embodiments are part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
In the description of the embodiments of the present invention, it should be understood that the orientations and positional relationships indicated by the terms "horizontal", "bottom", "inner", and the like are based on the orientations and positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, it should be noted that the terms "first", "second", "third", "fourth", and the like are used for descriptive purposes only, for example, to distinguish various components to more clearly explain/explain the technical solution, and are not to be interpreted as indicating or implying any number of technical features or order of significance.
As shown in fig. 1 to 3, an embodiment of the present invention provides a battery, including: the shell 1 is enclosed into a cavity; the housing 1 comprises a first lateral end 11; the battery cell 2 is located in the cavity, the battery cell 2 has a first side surface facing the first side end 11, the first side surface is provided with at least two protrusions 23 and first tabs 21, and a distance from one side of each of the first tabs 21 connected to the battery cell 2 to the first side end 11 is greater than a distance from the protrusion 23 to the first side end 11. In the width direction of the battery cell, a gap is reserved between the first tab and the adjacent protrusion.
Therefore, the space between the first side end 11 and the end surface of the electric core 2 provided with the first tab 21 is utilized, so that the part of the electric core 2 not provided with the first tab extends to form the protrusion 23, the required length of the first tab is ensured, meanwhile, the space areas on two sides of the first tab are utilized to a greater extent, the effective area of the electric core is increased, and the capacity of the battery is increased.
In the battery, a first receiving area is formed between two adjacent protrusions 23, and the first tab is disposed in the first receiving area.
The distance from the protrusion 23 to the first side end 11 refers to the distance from one end of the protrusion 23 close to the first side end 11.
In general, the longitudinal direction of the casing 1 is also the longitudinal direction of the cell 2, the width direction of the casing 1 is also the width direction of the cell 2, and the thickness direction of the casing 1 is also the thickness direction of the cell 2.
Specifically, a tab area and an extension area exist on one side of the battery cell 2 facing the first side end 11, wherein end surfaces of the tab area and the extension area are flush, the end surface of the extension area extends towards the first side end 11 to form a protrusion 23, and the first tab 21 is disposed on the end surface of the tab area.
Generally, there is a gap between the first tab 21 and the adjacent protrusion 23, and the positioning structure can be inserted into the gap to position the first tab 21.
In some embodiments, the projection of the first tab 21 on the first side end 11 does not overlap the projection of the protrusion 23 on the first side end 11. That is, in the above embodiment, the projection of the first tab 21 parallel to the extending direction of the first side end 11 and the projection of the protrusion 23 parallel to the extending direction of the first side end 11 do not overlap. Specifically, on the side of the battery cell 2 facing the first side end 11, the protrusion 23 and the first tab 21 are distributed along the width direction of the battery cell 2.
Generally, there is a gap between the first tab 21 and each of the adjacent protrusions 23.
In the above embodiments, the distance between the first tab and the adjacent protrusion in the width direction of the battery cell is in a range of 0.3mm to 3mm, such as 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, 2.2mm, 2.5mm, 2.8mm, 3mm, or a range of any two of them. The distance between the first tab and each adjacent protrusion may be equal or different.
The distance between the first tab and the adjacent protrusion is the shortest distance between the first tab and the adjacent protrusion in the width direction of the battery cell.
In some embodiments, the dimension of the protrusion 23 in the thickness direction of the battery cell 2 is equal to the thickness of the battery cell 2.
The battery cell 2 may include a plurality of electrode plates stacked in a horizontal direction, and the electrode plates are stacked in a thickness direction of the battery cell 2 when the battery cell is placed horizontally, where the thickness direction of the battery cell 2 is also the thickness direction of the electrode plates.
In some embodiments, the battery cell 2 includes a first pole piece, a second pole piece, and a diaphragm located between the first pole piece and the second pole piece, wherein the first pole tab is disposed on the first pole piece, and the second pole tab is disposed on the second pole piece.
In the above embodiment, the first pole piece, the diaphragm, and the second pole piece are sequentially stacked, and the polarities of the first pole piece and the second pole piece are opposite. For example, the first pole piece is a positive pole piece and the second pole piece is a negative pole piece, or the first pole piece is a negative pole piece and the second pole piece is a positive pole piece.
In the above embodiment, a separator is disposed between every two adjacent first pole pieces and every two adjacent second pole pieces, and the separator is used for preventing the pole pieces with opposite polarities from contacting to cause a short circuit of the battery.
In the above embodiment, the number of the first pole piece and the second pole piece is plural, and each first pole piece is provided with at least one first pole tab 21, that is, the number of the first pole tabs 21 is plural. Each second pole piece is provided with at least one second pole tab 22, that is, the number of the second pole tabs 22 is multiple.
Specifically, one end of each of the first pole piece 4, the diaphragm 6 and the second pole piece 5 is provided with a first notch, the first notch corresponds to the first notch, the first tab is located in the first notch of the first pole piece, after the first pole piece, the diaphragm and the second pole piece are stacked, the side wall of the first notch of the first pole piece, the side wall of the first notch of the diaphragm and the side wall of the first notch of the second pole piece are sequentially attached to form the protrusion 23, one end of each of the first pole piece, the diaphragm and the second pole piece is provided with a second notch, the second notch corresponds to the second notch, the second tab is located in the second notch of the second pole piece, after the first pole piece, the diaphragm and the second pole piece are stacked, the side wall of the first notch of the first pole piece, the side wall of the first notch of the diaphragm and the side wall of the first notch of the second pole piece are sequentially attached to form the protrusion 23.
In some embodiments, the first tab 21 includes a first connection portion 211 adjacent to the battery cell 2, and a second connection portion 212 contiguous to the first connection portion 211. Wherein a surface of the first connection portion 211 of the first tab 21 may be perpendicular to a surface of the second connection portion 212.
In the above embodiment, the second connection portion 212 and the extending direction of the first pole piece are substantially parallel. Therefore, the connection stability between the first tab 21 and the battery cell 2 can be improved, and the cavity space can be saved.
In the above embodiment, the surface of the first connection portion 211 of the first tab 21 is perpendicular to the surface of the second connection portion 212. The surface of the first connection portion 211 may be perpendicular to the surface of the electrode pad, and the surface of the second connection portion 212 may be parallel to the surface of the electrode pad.
As shown in fig. 4, in the embodiment of the present invention, the first pole piece 4, the diaphragm 6, and the second pole piece 5 are stacked in sequence. In the structure that the first pole pieces 4, the diaphragm 6 and the second pole piece 5 are sequentially stacked, the first pole lugs extending out of the first pole pieces are sequentially stacked and folded, and the second pole lugs extending out of the second pole pieces are sequentially stacked and folded.
In some embodiments, the cell further comprises a first insulating layer located at an interface area of the first tab and the cell; the battery cell further comprises a second insulating layer, and the second insulating layer is located in a junction area between the second pole lug and the battery cell.
In the above embodiments, in order to avoid contact between the first tab 21 and the adjacent second pole piece, a first insulating layer is generally disposed between the first tab 21 and the adjacent second pole piece, and in some embodiments, the size of the first insulating layer in the width direction of the battery cell is in a range of 0.5mm to 3mm, such as a range of 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, 2.2mm, 2.5mm, 2.8mm, 3mm, or any two of them. The dimension of the first insulating layer in the width direction of the battery cell is substantially the same as the dimension of the first tab in the width direction of the battery cell.
In some embodiments, the side of the battery cell 2 facing the first side end 11 is provided with a second tab 22, and the second tab 22 has a polarity opposite to that of the first tab 21. The first tab 21 and the second tab 22 are arranged on the same side of the battery core 2, which is beneficial to further saving the cavity space and improving the performance of the battery.
In general, the projection of the second tab 22 on the first lateral end 11 does not overlap with the projection of the protrusion 23 on the first lateral end 11, and the projection of the second tab 22 on the first lateral end 11 does not overlap with the projection of the first tab 21 on the first lateral end 11. Wherein the extending direction of the first side end 11 is parallel to the surface of the first side end 11, and the extending direction of the first side end 11 may be the thickness direction of the housing 1.
In some embodiments, the second pole ear 22 is positioned between two adjacent protrusions 23, there being a protrusion 23 between the second pole ear 22 and the first pole ear 21 (i.e., the first pole ear 21 and the second pole ear 22 are separated by a protrusion 23). For example, the number of the first tabs 21 is n1, the number of the second tabs 22 is n2, the number of the protrusions 23 is n3, n1 and n2 may be equal or different, n3= n1+ n2+1, and illustratively, n1=1, n2=1, and n3=3.
Generally, there is a gap between the second tab 22 and the adjacent protrusion 23, and the gap can be inserted with a positioning structure to position the tab.
In the above embodiment, the distance between the second tab 22 and the adjacent protrusion 23 in the width direction of the battery cell is in a range of 0.3mm-3mm, such as 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, 2.2mm, 2.5mm, 2.8mm, 3mm, or a range formed by any two of them. The distance between the second tab and each adjacent protrusion may be equal or different.
In some embodiments, the distance from the side of the second pole ear 22 adjacent to the battery cell 2 to the first side end 11 is greater than the distance from the protrusion 23 to the first side end 11. Therefore, the space between the first side end 11 and the end surface of the battery cell 2 provided with the second tab 22 is utilized to extend the part of the battery cell 2 not provided with the tab to form the protrusion 23, so that the required length of the second tab is ensured, the space areas on two sides of the second tab are utilized to a greater extent, the effective area of the battery cell is increased, and the capacity of the battery is increased.
The distance from the side of the second tab 22 adjacent to the battery cell 2 to the first side end 11 and the distance from the side of the first tab 21 adjacent to the battery cell 2 to the first side end 11 may be equal or different, preferably substantially equal, which is more beneficial to saving cavity space and improving battery performance.
In other embodiments, the battery cell further has a second side surface disposed opposite to the first side surface at a distance, and the second side surface is provided with two second protrusions and a second tab, that is, the first tab is disposed opposite to the second tab.
In the above embodiment, the second tab is located between two adjacent second protrusions, that is, a second receiving area is formed between two adjacent second protrusions, and the second tab is located in the second receiving area.
In the above embodiment, one side of the first pole piece 4, the diaphragm 6, and the second pole piece 5 is provided with a first notch, the first notch corresponds to the first notch, the other side of the first pole piece, the diaphragm, and the second pole piece is provided with a second notch, the second notch corresponds to the first notch, the first tab is located in the first notch of the first pole piece, the second tab is located in the first notch of the second pole piece, after the first pole piece, the diaphragm, and the second pole piece are stacked, the sidewall of the first notch of the first pole piece, the sidewall of the first notch of the diaphragm, and the sidewall of the second notch of the second pole piece are sequentially bonded to form a first protrusion, and the sidewall of the second notch of the first pole piece, the sidewall of the second notch of the diaphragm, and the sidewall of the first notch of the second pole piece are sequentially bonded to form a second protrusion.
When the battery is horizontally placed, the housing 1 includes a bottom side plate (or bottom plate) connected to the first side end 11, and further, the bottom side plate is not parallel to the surface of the first side end 11, for example, the surface of the bottom side plate is perpendicular to the surface of the first side end 11.
In some embodiments, the second connection parts of the plurality of first tabs are sequentially stacked, and the second connection parts of the plurality of first tabs are attached to each other to form a first tab plate. For example, the second connection portion 212 of the first tab 21 is bonded in a direction toward the bottom plate to form a first tab plate.
In other embodiments, the second connection portion 212 of the first tab 21 is attached toward the center line in the thickness direction of the battery cell 2 to form a first tab plate.
In the above embodiment, the end portion of the first tab plate from which the first tab plate projects is a substantially flush end surface. In some embodiments, the distance from the first pole lug plate to the first side end 11 in the direction from the battery cell to the first side end 11 is greater than or equal to the distance from the protrusion 23 to the first side end 11.
In some embodiments, when the distance from the first tab 21 to the first side end 11 is equal to the distance from the protrusion 23 to the first side end 11 in the direction from the battery cell 2 to the first side end 11, specifically, in the thickness direction of the battery cell 2, the first tab 21 and the first tab plate formed by the second connection portions 212 of the plurality of first tabs 21 do not protrude out of the outer edge of the battery cell 2. That is, in some embodiments, the protrusion 23 may be flush with the first tab plate/first tab 21 along the direction from the battery cell 2 to the first side end 11, so that the space waste of the cavity along the direction from the first side end 11 to the battery cell 2 may be reduced.
In other embodiments, when the distance from the first pole lug plate to the first side end 11 is greater than the distance from the protrusion 23 to the first side end 11 along the direction from the battery cell 2 to the first side end 11, specifically, the protrusion 23 is closer to the first side end 11 than the first pole lug plate/first pole lug 21, but is not limited thereto. The first pole ear 21/the first pole ear plate is relatively more favorably connected with the shell 1, and the stability is improved. In the above embodiment, after the plurality of first tab 21 plates are aligned and cut, the cut first tab plates still have a sufficient length for welding.
In addition, in the above-described embodiment, the second tab 22 includes the third connection portion 221 that abuts the battery cell 2,
further, in the above-described embodiment, the second pole ear 22 includes the third connection portion 221 adjacent to the battery cell 2, and the fourth connection portion 222 that meets the third connection portion 221. Wherein a surface of the third connection portion 221 of the second tab 22 may be perpendicular to a surface of the fourth connection portion 222.
In the above embodiment, the extending directions of the fourth connection portion 222 and the second pole piece are substantially parallel. Therefore, the connection stability between the second pole lug 22 and the battery cell 2 can be improved, and the cavity space can be saved.
In the above embodiment, the surface of the third connection portion 221 of the second pole ear 22 is perpendicular to the surface of the fourth connection portion 222. The surface of the third connection portion 221 may be perpendicular to the surface of the electrode sheet, and the surface of the fourth connection portion 222 may be parallel to the surface of the electrode sheet.
As shown in fig. 4, in the above embodiments, in order to avoid the second electrode tab 22 contacting the adjacent first electrode tab 4, the second insulating layer 32 is usually disposed between the second electrode tab 22 and the adjacent first electrode tab 4, and in some embodiments, the second insulating layer 32 has a dimension in the width direction of the battery cell in a range of 0.5mm to 3mm, such as a range of 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, 2.2mm, 2.5mm, 2.8mm, 3mm, or any two of them. The dimension of the second insulating layer 32 in the width direction of the cell substantially coincides with the dimension of the second electrode tab in the width direction of the cell.
In some embodiments, the fourth connection portions 222 of the plurality of second tabs 22 are sequentially stacked, and the fourth connection portions 222 of the plurality of second tabs 22 are attached to each other to form a second tab plate, for example, the fourth connection portions 222 of the second tabs 22 are attached to a direction close to the bottom side plate to form the second tab plate.
In other embodiments, the fourth connecting portion 222 of the second tab 22 is attached toward the center line in the thickness direction of the battery cell 2, so as to form a second tab plate.
In the above embodiment, the projecting end portion of the second pole ear plate is a substantially flush end surface. In some embodiments, the distance from the second pole ear plate to the first side end 11 in the direction from the battery cell 2 to the first side end 11 is greater than or equal to the distance from the protrusion 23 to the first side end 11.
In some embodiments, when the distance from the second pole ear plate to the first side end 11 in the direction from the battery cell 2 to the first side end 11 is equal to the distance from the protrusion 23 to the first side end 11, specifically, in the thickness direction of the battery cell 2, the second pole ear 22 and the second pole ear plate formed by the attachment of the fourth connection portions 222 of the plurality of second pole ears 22 do not protrude out of the outer edge of the battery cell 2. That is, in some embodiments, the protrusion 23 is flush with the second pole ear plate/second pole ear 22 along the direction from the battery cell 2 to the first side end 11, so that the space waste of the cavity along the direction from the first side end 11 to the battery cell 2 can be reduced.
In other embodiments, when the distance from the second tab plate to the first side end is greater than the distance from the protrusion to the first side end along the direction from the battery cell to the first side end, in particular, the distance from the fourth connection portion 222/the second tab plate of the second tab 22 to the first side end 11 is greater than the distance from the protrusion 23 to the first side end 11, or the protrusion 23 is closer to the first side end 11 than the second tab plate/the second tab 22, but is not limited thereto. The connection of the second pole ear 22/the second pole ear plate with the shell is relatively facilitated, and the stability is improved. In the above embodiment, after the plurality of second pole ear plates are aligned and cut, the cut second pole ear plates still have a sufficient length for welding.
In the above embodiment, along the direction from the battery cell 2 to the first side end 11, the distance from the first pole lug plate to the first side end 11 and the distance from the second pole lug plate to the first side end 11 may be equal, may also be different, and preferably are equal, that is, in the extending direction of the pole piece, the protruding end portion of the first pole lug plate and the protruding end portion of the second pole lug plate are substantially flush, so that the space of the first pole lug plate and the protruding end portion of the second pole lug plate are fully utilized in a limited cavity, which is more beneficial to saving the cavity space, and improving the energy density and other performances of the battery.
In some embodiments, the first tab 21 is a positive tab or a negative tab, and the second tab 22 is a negative tab or a positive tab, respectively.
The battery cell 2 comprises a laminated battery cell 2 and/or a coiled battery cell 2, wherein the coiled battery cell 2 is formed by stacking and coiling a plurality of electrode plates, and specifically is formed by sequentially stacking and coiling a first pole piece, a diaphragm and a second pole piece; the laminated battery cell 2 is specifically formed by sequentially stacking a first electrode plate, a diaphragm and a second electrode plate. The battery may specifically include a lithium ion battery, but is not limited thereto.
The housing 1 may be a flexible package housing, for example, the material of the housing may be an aluminum-plastic composite film material, that is, the first side end 11 and the bottom side plate may be made of the aluminum-plastic composite film material.
The lithium ion battery comprises a shell, and a battery cell 2 and electrolyte which are packaged in the shell; the battery core 2 is provided with a first tab 21 and a second tab 22.
In addition, still be equipped with on casing 1 and annotate the liquid hole and be used for sealed gasket of annotating the liquid hole, annotate the liquid hole and be used for annotating the electrolyte into the cavity, after the electrolyte is annotated, seal annotating the liquid hole with the gasket, this gasket can include the sheetmetal, and it can with annotate the peripheral casing 1 welding in liquid hole to seal annotating the liquid hole.
Specifically, the liquid injection hole may be disposed on the first side end 11, and the sealing sheet may be welded to a side of the first side end 11 away from the cavity, specifically, to a portion of the first side end 11 located around the liquid injection hole, so as to seal the liquid injection hole.
Further, the welding may be laser welding.
The battery provided by the above embodiment, one side that electric core 2 was equipped with first utmost point ear 21 is equipped with protrusion 23, and one side that first utmost point ear 21 and electric core 2 adjoined to is greater than protrusion 23 to the distance of first side end 11, can avoid owing to set up the waste of the cavity space that first utmost point ear 21 caused, has improved the space utilization of battery structure, has increased the effective area of electric core 2 to improve the performance such as energy density of battery. Meanwhile, the first tab 21 includes a first connection portion 211 adjacent to the electric core 2, and a first insulation layer 31 is arranged between the first connection portion 211 and the electric core 2, so that the first tab 21 can be ensured to be connected with the casing 1 in an insulation manner, and the safety, stability and other performances of the battery are improved.
It should be noted that the numerical values and numerical ranges related to the embodiments of the present invention are approximate values, and there may be a certain range of errors due to the manufacturing process, and the error can be considered to be ignored by those skilled in the art.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (12)
1. A battery, comprising:
the shell is enclosed into a cavity; the housing includes a first side end;
a cell located within the cavity, the cell having a first side facing a first side end; the first side surface is provided with at least two protrusions and a first tab, and the first tab is positioned between two adjacent protrusions; the distance from one side of the first electrode lug connected with the battery cell to the first side end is greater than the distance from the protrusion body to the first side end;
in the width direction of the battery cell, a gap is reserved between the first tab and the adjacent protrusion.
2. The battery of claim 1, wherein a projection of the first tab on the first lateral end does not overlap a projection of the protrusion on the first lateral end.
3. The battery according to claim 1,
in the width direction of the battery cell, the distance between the first tab and the adjacent protrusion is 0.3mm-3mm.
4. The battery of claim 1, wherein the cell comprises a plurality of first pole pieces, a second pole piece, and a separator between the first pole piece and the second pole piece, the first tab being disposed on the first pole piece, and the second tab being disposed on the second pole piece.
5. The battery of claim 4, wherein the cell further comprises a first insulating layer at an interface area of the first tab and the cell; and/or the presence of a gas in the atmosphere,
the battery cell further comprises a second insulating layer, and the second insulating layer is located in a junction area between the second pole lug and the battery cell.
6. The battery of claim 4, wherein the cell further comprises a first insulating layer between the first tab and the adjacent second tab; and/or the presence of a gas in the gas,
the battery cell further comprises a second insulating layer, and the second insulating layer is located between the second pole lug and the adjacent first pole piece.
7. The battery of claim 4, wherein the first side surface of the battery core is further provided with a second tab; and/or the presence of a gas in the gas,
the projection of the second tab on the first lateral end does not overlap with the projection of the protrusion on the first lateral end; and/or the presence of a gas in the atmosphere,
the projection of the second tab on the first side end is not overlapped with the projection of the first tab on the first side end.
8. The battery of claim 4, wherein the cell further has a second side surface disposed opposite the first side surface at a distance, the second side surface being provided with two protrusions and the second tab.
9. The battery of claim 7, wherein the second tab is located between two adjacent protrusions; and/or the presence of a gas in the gas,
a protrusion is arranged between the second tab and the first tab; and/or the presence of a gas in the gas,
the distance from the side, connected with the battery cell, of the second tab to the first side end is greater than the distance from the protrusion to the first side end.
10. The battery of claim 4, wherein the first tab comprises a first connection portion contiguous with the cell, and a second connection portion contiguous with the first connection portion;
the second connecting parts of the first lugs are sequentially stacked, and are attached to each other to form a first lug plate.
11. The battery of claim 10, wherein a distance from the first pole ear plate to the first side end in a direction from the cell to the first side end is less than or equal to a distance from the protrusion to the first side end.
12. The battery of any of claims 1-11, wherein the first tab is a positive tab or a negative tab; and/or the battery cell is a laminated battery cell or a winding battery cell.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220995799.2U CN217719889U (en) | 2022-04-27 | 2022-04-27 | Battery with improved battery capacity |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220995799.2U CN217719889U (en) | 2022-04-27 | 2022-04-27 | Battery with improved battery capacity |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118336139A (en) * | 2024-06-13 | 2024-07-12 | 蜂巢能源科技股份有限公司 | Electrode group and battery core |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118336139A (en) * | 2024-06-13 | 2024-07-12 | 蜂巢能源科技股份有限公司 | Electrode group and battery core |
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