CN218069948U - Battery with a battery cell - Google Patents
Battery with a battery cell Download PDFInfo
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- CN218069948U CN218069948U CN202220670712.4U CN202220670712U CN218069948U CN 218069948 U CN218069948 U CN 218069948U CN 202220670712 U CN202220670712 U CN 202220670712U CN 218069948 U CN218069948 U CN 218069948U
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- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 6
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- 229910000640 Fe alloy Inorganic materials 0.000 description 3
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 description 3
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- 238000010030 laminating Methods 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
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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 comprises a first side plate; the battery cell is located in the cavity, the battery cell is equipped with first utmost point ear towards one side of first curb plate and to the extension that first curb plate extends, first utmost point ear with one side that the battery cell meets extremely the distance of first curb plate is greater than the extension extremely the distance of first curb plate. The utility model discloses can improve the performance such as energy density of battery.
Description
Technical Field
The utility model relates to an electrochemistry energy memory field, concretely relates to battery.
Background
At present, electrochemical devices represented by batteries are widely applied, for example, lithium ion batteries have the advantages of large capacity, small volume, light weight, environmental protection and the like, and are widely applied to industries such as digital electronic products and electric automobiles. With the development of technology, the requirements for the performance of the battery, such as energy density, are also increasing, and therefore, the improvement of the performance of the battery, such as energy density, is urgently needed.
SUMMERY OF THE UTILITY MODEL
The utility model provides a battery can improve the performance such as energy density of battery.
The utility model provides a battery, include: the shell is enclosed into a cavity; the housing comprises a first side plate; the battery cell is located in the cavity, the battery cell is equipped with first utmost point ear towards one side of first curb plate and to the extension that first curb plate extends, first utmost point ear with one side that the battery cell meets extremely the distance of first curb plate is greater than the extension extremely the distance of first curb plate.
According to the utility model discloses an embodiment, the projection of first utmost point ear on the first curb plate with the projection of extension portion on the first curb plate is not overlapped.
According to the utility model discloses an embodiment, the battery still include with the sixth curb plate that first curb plate links to each other, first utmost point ear is in projection on the sixth curb plate with the extension is in projection on the sixth curb plate at least partially overlaps.
According to an embodiment of the present invention, the battery further includes a first connecting guide member located in the cavity, and the first connecting guide member is electrically connected to the first tab; the first guide connecting piece comprises a second connecting piece, and the first electrode lug comprises a second connecting portion connected with the second connecting piece.
According to the utility model discloses an embodiment, electric core includes the pole piece of a plurality of range upon range of settings, the second connecting portion of first utmost point ear with the one side that the second connection piece of first guide connecting piece meets with the extending direction of pole piece is parallel basically.
According to an embodiment of the present invention, the battery further includes a first connecting piece electrically connected to the first tab, the first connecting piece being located in the cavity, the first connecting piece including a second connecting piece; the shell comprises a second side plate connected with the first side plate, the first tab comprises a first connecting part and a second connecting part which are connected, the first connecting part is connected with the battery cell, and one side of the second connecting part, which is far away from the second side plate, is connected with the second connecting piece; or one side of the second connecting part facing the second side plate is connected with the second connecting piece.
According to an embodiment of the present invention, the battery cell includes a first pole piece, a second pole piece, and a diaphragm located between the first pole piece and the second pole piece, the first tab is disposed on the first pole piece; and the second connecting parts of the first lugs are sequentially laminated to form a first lug plate, and the first lug plate is connected with the first guide connecting piece.
According to an embodiment of the present invention, the housing includes a second side plate and a third side plate connected to the first side plate, and the second side plate and the third side plate are disposed opposite to each other; the second connecting portion orientation of first utmost point ear is close to the orientation laminating of second curb plate forms first utmost point otic placode, perhaps, the second connecting portion orientation of first utmost point ear is close to the orientation laminating of third curb plate forms first utmost point otic placode, perhaps, the second connecting portion orientation of first utmost point ear the laminating of the ascending central line in the thickness direction of electricity core forms first utmost point otic placode.
According to the utility model discloses an embodiment, follow electric core extremely the direction of first curb plate, first utmost point otic placode extremely the distance of first curb plate is more than or equal to the extension extremely the distance of first curb plate.
According to an embodiment of the present invention, the first guide connecting piece further includes a first connecting piece connected to the second connecting piece, and the first connecting piece is located between the first side plate and the first connecting portion of the first tab; and/or the second connecting piece is positioned between the second side plate and the second connecting part of the first pole lug; and/or a first included angle is formed between one surface of the first connecting part connected with the battery core and one surface of the second connecting part connected with the second connecting sheet, and the range of the first included angle is 80-120 degrees.
According to an embodiment of the present invention, a second included angle is formed between the plane where the first connection piece is located and the plane where the second connection piece is located, and the range of the second included angle is 80-120 °.
According to the utility model discloses an embodiment, the second connecting portion of first utmost point ear extremely the distance of second curb plate is more than or equal to electricity core extremely the distance of second curb plate.
According to an embodiment of the present invention, the battery further includes a first guiding member electrically connected to the first tab, the first guiding member being located in the cavity; the shell further comprises a second side plate, and the projection of the first guide piece on the second side plate is not overlapped with the projection of the extension part on the second side plate.
According to an embodiment of the present invention, the battery further includes a first guide connecting member electrically connected to the first tab, the first guide connecting member being located in the cavity, the first guide connecting member including a first connecting piece; the battery is still including setting up first curb plate deviates from the first outer splicing of one side of cavity, first outer splicing includes the first utmost point post of outside protruding formation, first splicing include with first utmost point post corresponds the first through-hole that sets up, first utmost point post pierces through first curb plate, and pass through first through-hole with first splicing meets.
According to an embodiment of the present invention, the first through hole of the first connection piece includes a first hole section and a second hole section connected to each other, and the second hole section is located at a side of the first hole section close to the battery cell; one end, close to the battery cell, of the first pole column extends outwards to form a first extending portion corresponding to the second hole section.
According to the utility model discloses an embodiment, a terminal surface that is close to electric core of first utmost point post with a side surface that is close to electric core of first connecting piece flushes.
According to the utility model discloses an embodiment, first utmost point post is close to the one end of electricity core is stretched out first through-hole, edge the circumference of first through-hole outwards extend be formed with first connecting piece is close to the first extension that a side surface of electricity core meets.
According to an embodiment of the present invention, a first insulating sheet is further disposed between the first outer connecting sheet and the first side plate, a second insulating sheet is further disposed between the first connecting member and the first side plate, and the first terminal penetrates through the first insulating sheet and the second insulating sheet; and/or a first insulating layer is arranged between the first pole and the first side plate.
According to the utility model discloses an embodiment, the projection of first insulation piece on the first curb plate covers the projection of first outer splicing on the first curb plate.
According to an embodiment of the present invention, the housing further includes a second side plate connected to the first side plate, and the second insulating sheet includes a first insulating portion and a second insulating portion; the first insulating part is positioned between the first side plate and the first guide connecting piece, and the first pole penetrates through the first insulating part; the second insulating part is located between the second side plate and the first guide connecting piece.
According to an embodiment of the present invention, the projection of the second insulating portion on the second side plate covers the projection of the first guiding element on the second side plate, and/or the projection of the first insulating portion on the first side plate covers the projection of the first guiding element on the first side plate.
According to an embodiment of the present invention, the number of the extending portions is at least two, and the first tab is located between two adjacent extending portions; and/or the length of the extension part in the thickness direction of the battery cell is equal to the thickness of the battery cell.
According to the utility model discloses an embodiment, electric core towards one side of first curb plate still is equipped with the second utmost point ear, the second utmost point ear with first utmost point ear polarity is opposite.
According to an embodiment of the present invention, a distance from a side of the second tab connected to the battery cell to the first side plate is greater than a distance from the extending portion to the first side plate; and/or the battery further comprises a second lead connected with the second pole lug, and the second lead is positioned in the cavity; the second guide connecting piece comprises a third connecting piece and a fourth connecting piece, the third connecting piece is positioned between the first side plate and the second lug, and the second lug comprises a fourth connecting part connected with the fourth connecting piece; and/or the battery further comprises a second lead electrically connected with the second tab, the second lead being located within the cavity; the second guide connecting piece comprises a fourth connecting piece, and the second tab comprises a fourth connecting part connected with the fourth connecting piece; the battery cell comprises a plurality of pole pieces which are stacked, and one surface of the fourth connecting part of the second pole lug, which is connected with the fourth connecting piece of the second guide connecting piece, is basically parallel to the extending direction of the pole pieces.
According to an embodiment of the present invention, the extension portion exists between the second tab and the first tab; and/or the number of the extension parts is at least two, and the second pole ear is positioned between two adjacent extension parts; and/or the projection of the second tab on the first side plate is not overlapped with the projection of the extension part on the first side plate; and/or the projection of the second tab on the first side plate is not overlapped with the projection of the first tab on the first side plate; and/or the shell further comprises a sixth side plate connected with the first side plate, and the projection of the second tab on the sixth side plate is at least partially overlapped with the projection of the extension part on the sixth side plate; and/or the shell further comprises a sixth side plate connected with the first side plate, and the projection of the second tab on the sixth side plate is at least partially overlapped with the projection of the first tab on the sixth side plate.
According to the utility model discloses an embodiment, the battery still includes the buffering piece, the buffering piece is located the extension with between the first curb plate.
According to the utility model discloses an embodiment, the battery still includes the buffer sheet, the buffer sheet is including continuous first buffering portion and second buffering portion, first buffering position in the extension with between the first curb plate, the second buffering position in the first connecting portion of first utmost point ear with between the first connecting piece of first guide connection piece.
According to an embodiment of the present invention, the width of the first buffer portion is greater than or equal to the width of the second buffer portion; and/or the second buffer part is provided with a first groove, and the second connecting part of the first tab extends into the first groove.
According to an embodiment of the present invention, a projection of the second buffer portion in the thickness direction of the battery cell overlaps with a projection of the second connection portion of the first tab and the first guide connection member in the thickness direction of the battery cell; and/or the length of the first groove in the width direction of the battery cell is greater than or equal to the length of the second connecting part of the first tab in the width direction of the battery cell; and/or the length of the first groove in the thickness direction of the battery cell is greater than or equal to the length of the second connecting part of the first tab in the thickness direction of the battery cell; and/or the end part of the second connecting part of the first tab extends out of the first groove along the length direction of the battery core.
According to the utility model discloses an embodiment, the width of electricity core is an, the buffer chip is in the ascending length of width direction of electricity core is b, and 0 ≦ a-b | ≦ 3.
According to the utility model discloses an embodiment, electric core has relative first face and the second face that sets up, and is located side between first face and the second face at least partial region of the side of at least one side of electric core is equipped with first protection glue film.
According to the utility model discloses an embodiment, electric core includes the pole piece of a plurality of range upon range of settings, the first protection glue film of the side of electric core extends to the first face of electric core and with be located the pole piece of the first face of electric core bonds and/or extends to the second face of electric core and with be located the second face of electric core's pole piece bonds.
According to the utility model discloses an embodiment, the quantity of first protection glue film is a plurality of, and is a plurality of first protection glue film interval sets up the side of electricity core.
According to an embodiment of the present invention, the extension portion has a first surface and a second surface opposite to each other, and the first surface of the extension portion and/or the second surface of the extension portion are provided with a second protective adhesive layer.
According to an embodiment of the present invention, a direction from the first surface of the extension portion to the second surface of the extension portion is perpendicular to a direction from the first tab to the extension portion.
According to an embodiment of the present invention, the first tab is a positive tab or a negative tab; and/or the battery cell comprises a laminated battery cell or a winding battery cell.
The utility model discloses in, one side that electric core was equipped with first utmost point ear has the extension, and one side that first utmost point ear and electric core met is greater than the extension extremely to the distance of first curb plate can avoid from this owing to set up the waste of the cavity space that first utmost point ear caused, through the functional area's of extension increase cavity internal electric core volume to improve the performance such as energy density of battery.
Drawings
Fig. 1 is a schematic structural diagram of a battery according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an electrical core according to an embodiment of the present invention;
fig. 3 is a schematic cross-sectional view of a battery part showing a first terminal according to an embodiment of the present invention;
fig. 4 is a schematic view illustrating a connection structure of the first guide connector and the housing according to an embodiment of the present invention;
fig. 5 is a schematic view illustrating a connection structure of the first guide connector and the housing according to an embodiment of the present invention;
fig. 6 is an enlarged view of a partial region of a connection structure of the first guide member and the housing according to an embodiment of the present invention.
Description of reference numerals:
1: a housing; 11: a first side plate; 12: a second side plate; 13: a third side plate; 14: a fourth side plate; 15: a fifth side plate; 16: a sixth side plate; 17: a circular arc transition portion; 131: a thinning portion; 100: a liquid injection hole; 2: an electric core; 23: an extension portion; 21: a first tab; 211: a first connection portion; 212: a second connecting portion; 22 a second ear; 221: a third connecting part; 222: a fourth connecting portion; 3': a second lead; 31: a first connecting piece; 32: a second connecting sheet; 31': a third connecting sheet; 32': a fourth connecting sheet; 41: a first outer tab; 41': a second outer tab; 42: a first pole column; 43: a first extension portion; 5: a first insulating sheet; 5': a third external insulation sheet; 6: a second insulating sheet; 6': a fourth insulating sheet; 61: a first insulating portion; 62: a second insulating section; 61': a third insulating section; 62': a fourth insulating section; 30: a first through hole; 60: a second through hole; 110: a third through hole; 50: a fourth via hole; 30': a fifth through hole; 60': a sixth through hole; 120: a seventh via hole; 50': an eighth through hole; 71: a first protective glue layer; 72: a second protective adhesive layer; 8: a first insulating layer; 9: a buffer sheet; 91: a first buffer section; 92: a second buffer portion; 93: and a third buffer portion.
Detailed Description
In order to make the technical solution of the present invention better understood, the present invention is further described in detail below. The following detailed description is merely illustrative of the principles and features of the present invention, and the examples are intended to be illustrative of the invention and are not intended to limit the scope of the invention. Based on the embodiment of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and the like are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; mechanical connection or electrical connection; the two elements may be directly connected, indirectly connected through an intermediate medium, or connected to each other through an internal communication. The above-described meaning of what is specifically intended in the present invention can be understood in specific instances by those of ordinary skill in the art. Furthermore, the terms "first", "second", "third", "fourth", etc. are used for descriptive purposes only, for example, to distinguish components for clarity/explanation of technical solution, and are not to be construed as indicating or implying any number of technical features or order of substantial significance, etc.
The battery is a commonly used electrochemical energy storage device, and generally includes a casing, an electric core encapsulated in a cavity surrounded by the casing, and the like, wherein the electric core is provided with a tab (a first tab as described below), and a large space is usually required to be reserved between the casing and the electric core for setting the tab, which results in more waste of cavity space and influences on performances of the battery, such as energy density and the like.
As shown in fig. 1 to 6, an embodiment of the present invention provides a battery, including: the shell 1 is enclosed into a cavity; the housing 1 comprises a first side plate 11; electric core 2 is located the cavity, and electric core 2 is equipped with first utmost point ear 21 and the extension 23 that extends to first curb plate 11 towards one side of first curb plate 11, and the distance of one side that first utmost point ear 21 and electric core 2 meet to first curb plate 11 is greater than the distance of extension 23 to first curb plate 11. Therefore, the space between the first side plate 11 and the end surface of the battery cell 2 provided with the first tab 21 is utilized to extend the part of the battery cell 2 not provided with the tab to form the extension part 23, so that the energy density and other performances of the battery can be improved.
In addition, one side of the electric core 2 facing the first side plate 11 is further provided with a second tab 22, the polarity of the second tab 22 is opposite to that of the first tab 21, and the first tab 21 and the second tab 22 are arranged on the same side of the electric core 2, so that the cavity space is further saved, and the performances of the battery, such as energy density, are improved. Specifically, the first tab 21 may be a positive tab or a negative tab, and correspondingly, the second tab 22 may be a negative tab or a positive tab.
The distance from the side where the second tab 22 is connected to the electrical core 2 to the first side plate 11 is greater than the distance from the extension portion 23 to the first side plate 11, the distance from the side where the second tab 22 is connected to the electrical core 2 to the first side plate 11 and the distance from the side where the first tab 21 is connected to the electrical core 2 to the first side plate 11 may be equal or unequal, and preferably are substantially equal, which is more favorable for saving cavity space and improving performances such as energy density of the battery.
Specifically, a first area, a second area and a third area exist on one side of the electric core 2 facing the first side plate 11, the third area extends towards the first side plate 11 to form an extension portion 23, a distance from the end surface of the first area to the first side plate 11 and a distance from the end surface of the second area to the first side plate 11 are respectively smaller than a distance from the end surface of the third area to the first side plate 11, the first tab 21 is arranged on the end surface of the first area, and the second tab 22 is arranged on the end surface of the second area.
Generally, a projection of the first tab 21 on the first side plate 11 and a projection of the extending portion 23 on the first side plate 11 may not overlap (that is, a projection of the first tab 21 parallel to the extending direction of the first side plate 11 and a projection of the extending portion 23 parallel to the extending direction of the first side plate 11 do not overlap), a projection of the second tab 22 on the first side plate 11 and a projection of the extending portion 23 on the first side plate 11 may not overlap, and a projection of the second tab 22 on the first side plate 11 and a projection of the first tab 21 on the first side plate 11 may not overlap.
Specifically, the extending direction of the first side plate 11 is parallel to the surface of the first side plate 11, for example, the direction from the first side plate 11 to the electric core 2 is parallel to the length direction of the casing 1, and the extending direction of the first side plate 11 may be the width direction of the casing 1 or the thickness direction of the casing 1.
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. In addition, the battery cell 2 may include a plurality of pole pieces (or called electrode pieces) stacked in layers, where the pole pieces are stacked in the thickness direction of the battery cell 2, that is, the thickness direction of the battery cell 2 is also the thickness direction of the electrode pieces.
In addition, the battery further comprises a sixth side plate 16 connected with the first side plate 11, a projection of the first tab 21 on the sixth side plate 16 at least partially overlaps a projection of the extension 23 on the sixth side plate 16, a projection of the second tab 22 on the sixth side plate 16 and a projection of the extension 23 on the sixth side plate 16 may at least partially overlap, a projection of the second tab 22 on the sixth side plate 16 and a projection of the first tab 21 on the sixth side plate 16 may at least partially overlap, and generally, a projection of the extension 23 on the sixth side plate 16 may cover the projection of the first tab 21 on the sixth side plate 16 and the projection of the second tab 22 on the sixth side plate 16. For example, the extension portion 23, the first tab 21, and the second tab 22 may be distributed along a first direction perpendicular to the direction from the battery cell 2 to the first side plate 11, for example, the width direction of the battery cell 2 (that is, a projection of the extension portion 23 perpendicular to the width direction of the battery cell 2 at least partially overlaps with a projection of the first tab 21 perpendicular to the width direction of the battery cell 2).
Specifically, the surface of the sixth side plate 16 may be perpendicular to the surface of the first side plate 11, the surface of the sixth side plate 16 may be perpendicular to the surface of the electrode sheet (parallel to the thickness direction of the electrode sheet), and the surface of the first side plate 11 may be perpendicular to the surface of the electrode sheet.
In general, the length of the extension portion 23 in the thickness direction of the battery cell 2 is equal to the thickness of the battery cell 2. Particularly, extension 23 and electric core 2 have relative first face and second face respectively, and first face and second face are located electric core 2 respectively towards the relative both sides of the terminal surface of first curb plate 11 (be equipped with the terminal surface of first utmost point ear 21 and extension 23 promptly), and the first face of extension 23 is flat with the first face of electric core 2, and the second face of extension 23 is flat with the second face of electric core 2.
In addition, the number of the extension portions 23 may be at least two, the first tab 21 may be located between two adjacent extension portions 23, the second tab 22 may also be located between two adjacent extension portions 23, and there is an extension portion 23 between the second tab 22 and the first tab 21 (i.e., the first tab 21 and the second tab 22 are separated by the extension portion 23). The number of the first tabs 21 is n1, the number of the second tabs 22 is n2, the number of the extensions 23 is n3, n1 and n2 may be equal or different, n3= n1+ n2+1, and illustratively, n1=1, n2=1, and n3=3.
In addition, the battery also comprises a first guide connecting piece electrically connected with the first tab 21, and the first guide connecting piece is positioned in the cavity; the first lead includes a second connection piece 32, and the first tab 21 includes a second connection portion 212 connected to the second connection piece 32. The surface of the second connection portion 212, which is connected to the second connection piece 32, is substantially parallel to the surface of the pole piece, specifically, the second connection portion 212 and the second connection piece 32 are stacked, and the surface of the second connection portion 212 and the surface of the second connection piece 32 are substantially parallel to the surface of the pole piece.
In general, the projection of the second connection portion 212 of the first tab 21 on the first side plate 11 contacts the projection of the second connection piece 32 of the first guide on the first side plate 11, but the remaining portions except the contact boundary do not overlap each other.
In some embodiments, the housing 1 includes a second side plate 12 connected to the first side plate 11, the first tab 21 further includes a first connection portion 211 connected to a second connection portion 212, and the first connection portion 211 is connected to the electric core 2, where a side of the second connection portion 212 facing away from the second side plate 12 is connected to a first connection piece, and specifically may be connected to a second connection piece 32 of the first connection piece, that is, the second side plate 12, the second connection portion 212, and the second connection piece 32 are stacked in sequence, and the second connection portion 212 is located between the second side plate 12 and the second connection piece 32; alternatively, one side of the second connecting portion 212 facing the second side plate 12 is connected to the first guide, and specifically, the second connecting portion 32 of the first guide may be connected to the second connecting portion, that is, the second side plate 12, the second connecting portion 32, and the second connecting portion 212 are sequentially stacked, and the second connecting portion 32 is located between the second side plate 12 and the second connecting portion 212. Therefore, the connection stability between the first tab 21 and the first guide connecting piece can be improved, the cavity space is saved, and the performances of the battery such as energy density and the like are improved.
In some embodiments, a first included angle is formed between a surface of the first connection portion 211, which is connected to the battery cell 2, and a surface of the second connection portion 212, which is connected to the second connection piece 32, and the first included angle is in a range of 80-120 °, for example, 80 °, 90 °, 100 °, 120 °, and the like.
Specifically, the surface of the second side plate 12 is parallel to the surface of the pole piece, the surface of the second side plate 12 is perpendicular to the surface of the first side plate 11, and the surface of the second side plate 12 is perpendicular to the surface of the sixth side plate 16. The surface of the first connection portion 211 of the first tab 21 may be perpendicular to the surface of the second connection portion 212, wherein the surface of the first connection portion 211 may be perpendicular to the surface of the pole piece, and the surface of the second connection portion 212 may be parallel to the surface of the pole piece.
In addition, the first guide member further includes a first connecting piece 31 connected to the second connecting piece 32; the first connecting piece 31 is located between the first side plate 11 and the first tab 21, and specifically may be located between the first side plate 11 and the first connecting portion 211 of the first tab 21, and a distance between the first connecting piece 31 and the first connecting portion 211 may be equal to or greater than a length of the second connecting portion 212 (or the second connecting piece 32) in a direction from the first connecting portion 211 to the first connecting piece 31.
In some embodiments, a second angle is formed between the plane of the first connecting piece 31 and the plane of the second connecting piece 32, and the second angle is in a range of 80-120 °, such as 80 °, 90 °, 100 °, 120 °, and the like.
Specifically, the battery cell 2 includes pole pieces stacked in sequence, the pole pieces include a first pole piece and a second pole piece, a diaphragm is disposed between the first pole piece and the second pole piece, that is, the battery cell includes a first pole piece, a second pole piece, and a diaphragm located between the first pole piece and the second pole piece, 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, the second pole piece is a negative pole piece, or the first pole piece is a negative pole piece, the second pole piece is a positive pole piece, the first tab 21 is disposed on the first pole piece, and the second tab 22 is disposed on the second pole piece. The number of the first pole piece and the second pole piece is respectively multiple, at least one first pole tab 21 is arranged on each first pole piece (namely, the number of the first pole tabs 21 is multiple), the second connecting portions 212 of the multiple first pole tabs 21 are sequentially attached to form a first pole tab plate, and the first pole tab plate is connected with the first guide connecting piece so as to realize that the first pole tabs 21 are connected with the first guide connecting piece, and particularly can be connected with the second connecting piece 32 of the first guide connecting piece.
Specifically, the first pole piece, the diaphragm and the second pole piece which are at least partially stacked are arranged as follows: one end of each of the first pole piece, the diaphragm and the second pole piece is provided with a first notch (or called a first notch), the first notches correspond to each other, the first pole lug is positioned 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 an extension part 23, and the first pole lug in the first notch of the first pole piece is sequentially attached to form a first pole lug plate; one end of each of the first pole piece, the diaphragm and the second pole piece is provided with a second notch (or called as a second notch), the positions of the second notches correspond to each other, the second pole lug is positioned in the second notch of the second pole piece, after the first pole piece, the diaphragm and the second pole piece are overlapped, 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 an extension part 23, and the second pole lug in the second notch of the second pole piece is sequentially attached to form a second pole lug plate.
Further, the case 1 further includes a third side plate 13 connected to the first side plate 11, the second side plate 12 is disposed opposite to the third side plate 13, and a surface of the second side plate 12 may be parallel to a surface of the third side plate 13.
In some embodiments, as shown in fig. 1, the second connecting portion 212 of the first tab 21 is attached toward the second side plate 12 to form a first tab plate, i.e., the distance from the first tab plate to the second side plate 12 is smaller than the distance from the first tab plate to the third side plate 13.
In other embodiments, the second connection portion 212 of the first tab 21 is attached toward the third side plate 13 to form a first tab plate, i.e. the distance from the first tab plate to the third side plate 13 is smaller than the distance from the first tab plate to the second side plate 12.
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 core 2, so as to form a first tab plate, that is, the distance from the first tab plate to the second side plate 12 and the distance from the first tab plate to the third side plate 13 may be substantially equal.
Generally, in the thickness direction of the battery cell 2, the first tab 21 and the first tab plate formed by attaching the second connection portions 212 of the plurality of first tabs 21 do not extend out of the outer edge of the battery cell 2, specifically, the distance from the second connection portion 212/first tab plate of the first tab 21 to the second side plate 12 may be greater than or equal to the distance from the battery cell 2 to the second side plate 12, and the distance from the second connection portion 212/first tab plate of the first tab 21 to the third side plate 13 may be greater than or equal to the distance from the battery cell 2 to the third side plate 13. In this way, the projection of the second connecting piece 32 connected with the second connecting portion 212/the first pole ear plate on the first side plate 11 is at least partially located in the projection of the battery cell 2 on the first side plate 11, so that the space waste of the cavity in the direction from the second side plate 12 to the third side plate 13 can be reduced, and the energy density and other performances of the battery can be improved.
Specifically, taking the second connecting piece 32 as an example, the second connecting piece 32 is disposed on the side of the second connecting portion 212/the first pole ear plate facing the second side plate 12, in a direction along the second connecting portion 212/the first pole ear plate to the second side plate 12, the second connecting piece 32 at least partially extends between the second connecting portion 212/the first pole ear plate and the side of the battery cell 2 facing the second side plate 12 (i.e., a projection of a portion of the second connecting piece 32 extending between the second connecting portion 212/the first pole ear plate and the side of the battery cell 2 facing the second side plate 12 on the first side plate 11 is located in a projection of the battery cell 2 on the first side plate 11) so as to be connected with the second connecting portion 212/the second pole ear plate (but not in contact with the extending portion 23).
In addition, in some embodiments, in the direction from the battery cell 2 to the first side plate 11, the extending portion 23 may be flush with the first pole ear plate/first pole tab 21, or the extending portion 23 is closer to the first side plate 11 than the first pole ear plate/first pole tab 21, that is, the distance from the first pole ear plate/first pole tab 21 to the first side plate 11 is equal to or greater than the distance from the extending portion 23 to the first side plate 11, which is favorable for further improving the energy density of the battery. However, in other embodiments, the first tab/first tab 21 may be closer to the first side plate 11 than the extension portion 23, that is, a distance from the first tab/first tab 21 to the first side plate 11 is smaller than a distance from the extension portion 23 to the first side plate 11, that is, in a direction from the battery cell 2 to the first side plate 11, one end of the first tab/first tab 21 away from the battery cell 2 is located between the extension portion 23 and the first side plate 11, which is relatively more favorable for connecting the first tab/first tab 21/first tab and the second connecting piece 32, so as to increase a contact area between the two, and improve stability.
In addition, the projection of the first guide piece on the second side plate 12 does not overlap the projection of the extension portion 23 on the second side plate 12, that is, the projection of the first connecting piece 31 on the second side plate 12 and the projection of the second connecting piece 32 on the second side plate 12 do not overlap the projection of the extension portion 23 on the second side plate 12.
In addition, the battery further includes a first outer contact piece 41 disposed on a side of the first side plate 11 departing from the cavity, the first outer contact piece 41 includes a first pole 42 protruding outwards, the first side plate 11 is provided with a third through hole 110 corresponding to the first pole 42, and the first pole 42 is connected with the first contact piece 31 through the third through hole 110.
In addition, the first connecting plate 31 includes a first through hole 30 disposed corresponding to the first pole 42, and the first pole 42 penetrates the first side plate 11 (i.e., passes through the third through hole 110) and is connected to the first connecting plate 31 through the first through hole 30. The first pole 42 passes through the third through hole 110 to penetrate through the first side plate 11, and the third through hole 110 and the first through hole 30 may be coaxially disposed.
In general, the cross section of the first pole 42 perpendicular to the axial direction of the first pole 42 is circular, and for example, the first pole 42 may be cylindrical, or the first pole 42 has a conical structure, that is, the diameter of the first pole 42 increases or decreases in the direction from the first side plate 11 to the first connecting plate 31, and the diameter of the first pole 42 is the diameter of the cross section of the first pole 42 perpendicular to the axial direction of the first pole 42.
Specifically, when the first pole 42 has a tapered structure, the diameter of the first pole 42 has a tendency to change (i.e., increase or decrease) in a direction from the first side plate 11 to the first connecting piece 31, and the change may be gradual, i.e., uniform increase or decrease with substantially the same magnitude. The diameters (diameters) of the third through hole 110 and the first through hole 30 vary with the diameter of the first pole 42, for example, in the direction from the first side plate 11 to the first connecting plate 31, the diameter of the first pole 42 gradually increases, and at this time, the diameters of the third through hole 110 and the first through hole 30 also gradually increase; in a direction from the first side plate 11 to the first connecting piece 31, the diameter of the first pole 42 gradually decreases, and at this time, the hole diameters of the third through hole 110 and the first through hole 30 also gradually decrease.
In some embodiments, the first through hole 30 of the first connection piece 31 includes a first hole section and a second hole section connected to each other, and the second hole section is located on a side of the first hole section close to the battery cell 2; one end of the first pole 42 close to the electric core 2 extends outwards to form a first extending portion 43 corresponding to the second hole section.
Specifically, the first hole section and the second hole section may be coaxially disposed, the first hole section and the second hole section are both circular through holes, the diameter of the second hole section is greater than the diameter of the end of the first hole section, which is connected to the second hole section, preferably, the diameter of the second hole section is greater than the diameter of the first hole section, and the axial projection of the second hole section perpendicular to the first through hole 30 may cover the axial projection of the first hole section perpendicular to the first through hole 30.
In addition, a cross-sectional area of the first outer tab 41 perpendicular to the axial direction of the first pole post 42 may be larger than a cross-sectional area of the first pole post 42 perpendicular to the axial direction of the first pole post 42, a projection of the first outer tab 41 perpendicular to the axial direction of the first pole post 42 covers a projection of the first pole post 42 perpendicular to the axial direction of the first pole post 42, a cross-sectional area of the first outer tab 43 perpendicular to the first pole post 42 is larger than a cross-sectional area of the first pole post 42 perpendicular to the axial direction of the first pole post 42, a projection of the first outer tab 43 perpendicular to the axial direction of the first pole post 42 covers a projection of the first pole post 42 perpendicular to the axial direction of the first pole post 42, a cross-sectional area of the first outer tab 41 perpendicular to the axial direction of the first pole post 42 is larger than a cross-sectional area of the first outer tab 43 perpendicular to the axial direction of the first pole post 42, a projection of the first outer tab 41 perpendicular to the axial direction of the first pole post 42 covers a projection of the first outer tab 43 perpendicular to the axial direction of the first pole post 42, a cross-sectional area of the first pole post 43 perpendicular to the axial direction of the second pole post 42 is substantially equal to a cross-sectional area of the axial direction of the second pole post segment of the through hole 30, and the through hole segment is a through hole segment of the through hole segment in which is also is clamped with the through hole segment.
In some embodiments, an end surface of the first pole 42 close to the battery cell 2 is flush with a side surface of the first connection plate 31 close to the battery cell 2. Specifically, the thickness of the first extension portion 43 in the axial direction of the first through hole 30 is substantially equal to the depth of the second hole section in the axial direction of the first through hole 30, so that the first extension portion 43 is snapped into the second hole section, and one end surface of the first extension portion 43 close to the battery cell 2 is flush with one side surface of the first connection plate 31 facing the battery cell 2.
In other embodiments, one end of the first terminal post 42 close to the battery cell 2 protrudes out of the first through hole 30, and extends outward along the circumferential direction of the first through hole 30 to form a first extending portion 43 connected to one side surface of the first connection sheet 31 close to the battery cell 2, that is, one end surface of the first terminal post 42 close to the battery cell 2 is not flush with one side surface of the first connection sheet 31 facing the battery cell 2, but is located between the first connection sheet 31 and the battery cell 2.
The first outer contact piece 41, the first pole 42, and the first outer extension portion 43 may be integrally formed, and may be made of metal, and in specific implementation, the first contact piece 31 and the first side plate 11 may be riveted by a rivet, after riveting, the rivet is located at one end of the first side plate 11 away from the cavity to form the first outer contact piece 41, the other end of the rivet forms the first outer extension portion 43, and the portion between the two ends of the rivet forms the first pole 42, where the formed first pole 42 is, for example, in a tapered structure.
Specifically, the first tab 21 may be electrically connected to the housing 1, and the first outer tab 41, the first pole 42, the first connecting tab 31 of the first guiding member may be in direct contact with the housing 1, or the second connecting tab 32 of the first transition may be welded to the second side plate 12 (or the third side plate 13) of the housing 1 (the first connecting tab 31, the first outer tab 41, and the like may not be provided). The first tab 21 is more preferably insulated from the case 1, and may be insulated by providing an insulating sheet (insulating layer).
In some embodiments, a first insulating sheet 5 is further disposed between the first outer tab 41 and the first side plate 11, a second insulating sheet 6 is further disposed between the first conductive connector and the first side plate 11, the first pole 42 penetrates through the first insulating sheet 5 and the second insulating sheet 6, and a first insulating layer 8 is disposed between the first pole 42 and the first side plate 11, so that the first outer tab 41, the first pole 42, the first conductive connector and the first pole tab 21 are electrically connected and insulated from the first side plate 11 (the casing 1).
The second insulation sheet 6 may be located between the first connection sheet 31 and the first side plate 11, that is, the first outer connection sheet 41, the first insulation sheet 5, the first side plate 11, the second insulation sheet 6, and the first connection sheet 31 are stacked in sequence.
Further, in the circumferential direction of the first through hole 30, the difference between the aperture of the first through hole 30 and the diameter of the pole is substantially equal to the width of the first insulating layer 8 in the circumferential direction of the first through hole 30, the circumferential direction of the first through hole 30 being perpendicular to the axial direction of the first through hole 30. Specifically, the first insulating layer 8 may be integrally formed with the first insulating sheet 5, the first insulating layer 8 being formed by a side of the first insulating sheet 5 close to the first side plate 11 protruding outward (protruding inward of the third through hole 110); alternatively, the first insulating layer 8 may be integrally formed with the second insulating sheet 6, and the first insulating layer 8 is formed by the second insulating sheet 6 protruding outward (protruding into the third through hole 110) on the side close to the first side plate 11.
Accordingly, the first insulating sheet 5 is provided with a fourth through hole 50, and the first pole 42 passes through the fourth through hole 50 to realize penetration of the first insulating sheet 5; the second insulating sheet 6 is provided with a second through hole 60, and the first pole 42 penetrates through the second through hole 60 to realize penetration of the second insulating sheet 6. Specifically, the first pole 42 sequentially passes through the fourth through hole 50, the third through hole 110, the second through hole 60, and the first through hole 30, so as to be connected to the first guiding component. The fourth through hole 50, the third through hole 110, the second through hole 60, and the first through hole 30 may be coaxially disposed.
Furthermore, the projection of the first insulating sheet 5 on the first side plate 11 may cover the projection of the first outer connecting sheet 41 on the first side plate 11 (i.e. the projection of the first outer connecting sheet 41 on the first side plate 11 is located within the projection of the first insulating sheet 5 on the first side plate 11). The projection of the second insulation sheet 6 on the first side plate 11 can cover the projection of the first connection sheet 31 on the first side plate 11, thereby further improving the performance of the battery, such as safety and stability.
Specifically, the second insulation sheet 6 may be an L-shaped structure including a first insulation portion 61 and a second insulation portion 62; the first insulating portion 61 is located between the first side plate 11 and the first conductive connecting member, and the first pole 42 penetrates through the first insulating portion 61 (i.e. the second through hole 60 is disposed on the third insulating portion 61'); the second insulating portion 62 is located between the second side plate 12 and the first guiding component, and specifically may be located between the second side plate 12 and the second connecting piece 32, that is, the second side plate 12, the second insulating portion 62, and the second connecting piece 32 are sequentially stacked, so that, through the second insulating portion 62, the first guiding component may be supported, and the first guiding component may be insulated from the second side plate 12 of the housing 1, thereby improving the safety, stability, and other performances of the battery.
The projection of the first insulating portion 61 on the first side plate 11 covers the projection of the first connecting piece on the first side plate 11 (covers the projection of the first connecting piece 31 on the first side plate 11), and the projection of the second insulating portion 62 on the second side plate 12 covers the projection of the first connecting piece on the second side plate 12 (covers the projection of the second connecting piece 32 on the second side plate 12).
Wherein, the surface of the second side plate 12 is parallel to the surface of the electrode sheet; the second side plate 12 is not parallel, e.g. perpendicular, to the surface of the first side plate 11; the second side plate 12 may be, for example, a bottom plate.
In addition, an included angle is formed between a surface of the first insulating portion 61 contacting the first connecting sheet 31 and a surface of the second insulating portion 62 contacting the second connecting sheet 32, and the included angle may range from 80 ° to 140 °, such as 80 °, 90 °, 100 °, 110 °, 120 °, 130 °, 140 °, and the like, i.e., the included angle is not parallel, such as perpendicular. The included angle formed between the first insulating portion 61 and the second insulating portion 62 (the planes of the two) may be in the range of 80 ° to 140 °, for example, 80 °, 90 °, 100 °, 110 °, 120 °, 130 °, 140 °, etc., i.e., the two are not parallel, for example, perpendicular.
In addition, the battery also comprises a second lead connector 3 'electrically connected with the second lug 22, and the second lead connector 3' is positioned in the cavity; the second lead connector 3' includes a fourth connecting piece 32', and the second tab 22 includes a fourth connecting portion 222 connected to the fourth connecting piece 32 '. The surface of the fourth connection portion 222 that contacts the fourth connection piece 32' is substantially parallel to the extending direction of the pole piece (i.e., the surface of the pole piece), specifically, the fourth connection portion 222 and the fourth connection piece 32' are stacked, and the surface of the fourth connection portion 222 and the surface of the fourth connection piece 32' are substantially parallel to the surface of the pole piece.
In general, the projection of the fourth connection portion 222 of the second tab 22 on the first side plate 11 contacts the projection of the fourth connection piece 32' of the first guide member on the first side plate 11, but the rest portions except the contact boundary do not overlap each other.
In some embodiments, the housing 1 includes a second side plate 12 connected to the first side plate 11, the second tab 22 further includes a third connection portion 221 connected to a fourth connection portion 222, the third connection portion 221 is connected to the electric core 2, wherein a side of the fourth connection portion 222 away from the second side plate 12 is connected to the second connecting piece 3', and specifically may be connected to a fourth connection piece 32' of the second connecting piece 3', that is, the second side plate 12, the fourth connection portion 222, and the fourth connection piece 32' are sequentially stacked, and the fourth connection portion 222 is located between the second side plate 12 and the fourth connection piece 32 '; or, one side of the fourth connecting portion 222 facing the second side plate 12 is connected to the second connecting piece 3', and specifically, the fourth connecting portion 222 may be connected to a fourth connecting piece 32' of the second connecting piece 3', that is, the second side plate 12, the fourth connecting piece 32', and the fourth connecting portion 222 are sequentially stacked, and the fourth connecting piece 32' is located between the second side plate 12 and the fourth connecting portion 222. Therefore, the connection stability between the second pole lug 22 and the second lead connector 3' can be improved, the cavity space is saved, and the energy density and other performances of the battery are improved.
In some embodiments, a second included angle is formed between a surface of the third connection portion 221, which is connected to the battery cell 2, and a surface of the fourth connection portion 222, which is connected to the fourth connection piece 32', and the second included angle is in a range of 80-120 °, for example, 80 °, 90 °, 100 °, 120 °, and the like.
Specifically, the surface of the third connection portion 221 of the second pole ear 22 may be perpendicular to the surface of the fourth connection portion 222, the surface of the third connection portion 221 may be perpendicular to the pole piece surface, and the surface of the fourth connection portion 222 may be parallel to the pole piece surface.
In addition, the second lead connector 3' further comprises a third connecting piece 31' connected with the fourth connecting piece 32 '; the third connecting piece 31 'is located between the first side plate 11 and the second lug 22, and particularly may be located between the first side plate 11 and the third connecting portion 221 of the second lug 22, and a distance between the third connecting piece 31' and the third connecting portion 221 may be equal to or greater than a length of the fourth connecting portion 222 (or the fourth connecting piece 32 ') in a direction along the third connecting portion 221 to the third connecting piece 31'.
In some embodiments, a second angle is formed between the plane of the third connecting piece 31 'and the plane of the fourth connecting piece 32', and the second angle is in a range of 80-120 °, such as 80 °, 90 °, 100 °, 120 °, and the like.
In addition, the second tab 22 is disposed on the second tab, each second tab is at least provided with one second tab 22 (that is, the number of the second tabs 22 is plural), the fourth connection portions 222 of the plural second tabs 22 are sequentially bonded to form a second tab plate, and the second tab plate is connected to the second connecting piece 3', so as to connect the second tab 22 to the second connecting piece 3', and specifically, can be connected to the fourth connection portion 32 'of the second connecting piece 3'.
In some embodiments, as shown in fig. 1, the fourth connecting portion 222 of the second tab 22 is attached toward the second side plate 12 to form a second tab plate, i.e., the distance from the second tab plate to the second side plate 12 is smaller than the distance from the second tab plate to the third side plate 13.
In other embodiments, the fourth connecting portion 222 of the second tab 22 is attached toward the third side plate 13 to form a second tab, i.e., the distance from the second tab to the third side plate 13 is smaller than the distance from the second tab to the second side plate 12.
In other embodiments, the fourth connection portion 222 of the second tab 22 is attached toward the center line in the thickness direction of the battery core 2, so as to form a second tab, that is, the distance from the second tab to the second side plate 12 and the distance from the second tab to the third side plate 13 may be substantially equal.
Generally, in the thickness direction of the battery cell 2, the second tab 22 and the second tab plate formed by attaching the fourth connection portions 222 of the plurality of second tabs 22 do not extend out of the outer edge of the battery cell 2, specifically, the distance from the fourth connection portion 222/the second tab plate of the second tab 22 to the second side plate 12 may be greater than or equal to the distance from the battery cell 2 to the second side plate 12, and the distance from the fourth connection portion 222/the second tab plate of the second tab 22 to the third side plate 13 may be greater than or equal to the distance from the battery cell 2 to the third side plate 13. In this way, the projection of the fourth connecting piece 32' connected with the fourth connecting portion 222/the second pole ear plate on the first side plate 11 is at least partially located in the projection of the battery core 2 on the first side plate 11, so that the space waste of the cavity in the direction from the second side plate 12 to the third side plate 13 can be reduced, and the energy density and other performances of the battery can be improved.
Specifically, taking the fourth connecting piece 32 'as an example, the fourth connecting piece 32' is disposed on the side of the fourth connecting portion 222/the second lug plate facing the second side plate 12, in a direction along the fourth connecting portion 222/the second lug plate to the second side plate 12, the fourth connecting piece 32 'at least partially extends between the fourth connecting portion 222/the second lug plate and the side of the battery cell 2 facing the second side plate 12 (i.e., a projection of a portion of the fourth connecting piece 32' extending between the fourth connecting portion 222/the second lug plate and the side of the battery cell 2 facing the second side plate 12 on the first side plate 11 is located in a projection of the battery cell 2 on the first side plate 11) so as to be connected with the fourth connecting portion 222/the second lug plate (but not in contact with the extending portion 23).
In addition, in some embodiments, in the direction from the battery cell 2 to the first side plate 11, the extending portion 23 may be flush with the second pole ear plate/second pole ear 21, or the extending portion 23 is closer to the first side plate 11 than the second pole ear plate/second pole ear 21, that is, the distance from the second pole ear plate/second pole ear 22 to the first side plate 11 is equal to or greater than the distance from the extending portion 23 to the first side plate 11, which is beneficial to further increase the energy density of the battery. However, in other embodiments, the second tab/the second tab 22 may be closer to the first side plate 11 than the extension portion 23, that is, the distance from the second tab/the second tab 22 to the first side plate 11 is smaller than the distance from the extension portion 23 to the first side plate 11, that is, in the direction from the battery cell 2 to the first side plate 11, one end of the second tab/the second tab 22 away from the battery cell 2 is located between the extension portion 23 and the first side plate 11, which is relatively more favorable for the connection between the second tab/the second tab 22 and the fourth connecting tab 32', so as to increase the contact area between the second tab/the second tab and the fourth connecting tab, and improve the stability.
In addition, the projection of the second guide connecting piece 3' on the second side plate 12 does not overlap the projection of the extension portion 23 on the second side plate 12, that is, the projection of the third connecting piece 31' on the second side plate 12 and the projection of the fourth connecting piece 32' on the second side plate 12 do not overlap the projection of the extension portion 23 on the second side plate 12 respectively.
In addition, the battery further comprises a second outer connecting piece 41' arranged on one side of the first side plate 11 departing from the cavity, the second outer connecting piece 41' comprises a second pole column which is formed in a protruding mode, the first side plate 11 is provided with a seventh through hole 120 which is correspondingly arranged with the second pole column, and the second pole column is connected with the third connecting piece 31' through the seventh through hole 120.
In addition, the third connecting piece 31 'includes a fifth through hole 30' corresponding to the second pole penetrating through the first side plate 11 (i.e. through the seventh through hole 120) and connecting with the third connecting piece 31 'through the fifth through hole 30'. Wherein, the second pole column passes through the seventh through hole 120 to penetrate through the first side plate 11, and the seventh through hole 120 and the fifth through hole 30' may be coaxially disposed.
In general, the cross section of the second pole column perpendicular to the axial direction of the second pole column is circular, and for example, the second pole column may be cylindrical, or the second pole column has a tapered structure, that is, the diameter of the second pole column increases or decreases in the direction from the first side plate 11 to the third connecting plate 31', and the diameter of the second pole column is the diameter of the cross section of the second pole column perpendicular to the axial direction of the second pole column.
Specifically, when the second pole is in a tapered structure, the diameter of the second pole tends to change (i.e., increase or decrease) in a direction from the first side plate 11 to the third connecting piece 31', and the change may be gradual, i.e., uniform increase or decrease with substantially the same magnitude. The diameters (diameters) of the seventh through hole 120 and the fifth through hole 30' are changed with the diameter of the second pole, for example, the diameter of the second pole is gradually increased along the direction from the first side plate 11 to the third connecting plate 31', and at this time, the diameters of the seventh through hole 120 and the fifth through hole 30' are also gradually increased; in the direction from the first side plate 11 to the third connecting piece 31', the diameter of the second pole is gradually reduced, and the diameters of the seventh through hole 120 and the fifth through hole 30' are also gradually reduced.
In some embodiments, the fifth through hole 30 'of the third connecting sheet 31' includes a third hole section and a fourth hole section connected to each other, and the fourth hole section is located on a side of the third hole section close to the battery cell 2; one end of the second pole column close to the battery cell 2 extends outwards to form a second external extension part correspondingly arranged with the fourth hole section.
Specifically, the third hole section and the fourth hole section may be coaxially disposed, the third hole section and the fourth hole section are both circular through holes, a diameter of the fourth hole section is greater than a diameter of an end of the third hole section connected to the fourth hole section, preferably, the diameter of the fourth hole section is greater than a diameter of the third hole section, and an axial projection of the fourth hole section perpendicular to the fifth through hole 30 'may cover an axial projection of the third hole section perpendicular to the fifth through hole 30'.
In addition, the cross-sectional area of the second outer contact piece 41 'perpendicular to the axial direction of the second pole column may be larger than the cross-sectional area of the second pole column perpendicular to the axial direction of the second pole column, the projection of the second outer contact piece 41' perpendicular to the axial direction of the second pole column covers the projection of the second pole column perpendicular to the axial direction of the second pole column, the cross-sectional area of the second outer contact piece 41 'perpendicular to the axial direction of the second pole column is larger than the cross-sectional area of the second outer contact piece perpendicular to the axial direction of the second pole column, the projection of the second outer contact piece 41' perpendicular to the axial direction of the second pole column covers the projection of the second outer contact piece perpendicular to the axial direction of the second pole column, the cross-sectional area of the second outer contact piece 41 'perpendicular to the axial direction of the second pole column is substantially equal to the cross-sectional area of the fourth hole section perpendicular to the axial direction of the second pole column (which is also the axial direction of the fifth through hole 30'), the second outer contact piece is clamped with the side wall of the fourth hole section, and the fourth hole section is connected with the side wall of the fourth hole section.
In some embodiments, an end surface of the second pole column close to the cell 2 is flush with a side surface of the third connecting plate 31' close to the cell 2. Specifically, the thickness of the second extension portion in the axial direction of the fifth through hole 30' is substantially equal to the depth of the fourth hole section in the axial direction of the fifth through hole 30', so that the second extension portion is snapped into the fourth hole section, and one end surface of the second extension portion, which is close to the battery cell 2, is flush with one side surface of the third connecting piece 31' facing the battery cell 2.
In other embodiments, one end of the second pole column close to the battery cell 2 protrudes out of the fifth through hole 30' and extends outward along the circumferential direction of the fifth through hole 30' to form a second outward extending portion connected to a side surface of the third connecting piece 31' close to the battery cell 2, that is, one end surface of the second pole column close to the battery cell 2 is not flush with a side surface of the third connecting piece 31' facing the battery cell 2, but is located between the third connecting piece 31' and the battery cell 2.
Wherein, the second outer joint piece 41', the second utmost point post, the second extension portion can integrated into one piece, and it can be the metal material, during the concrete implementation, can make third connection piece 31' rivet through the rivet with first curb plate 11, and after the riveting, the rivet is located the one end that first curb plate 11 deviates from the cavity and forms the second outer joint piece 41', and the other end forms the second extension portion, and the part between its both ends forms the second utmost point post, and the second utmost point post that forms for example is the toper structure.
Specifically, the second tab 22 may be electrically connected to the housing 1, and at this time, the second outer tab 41', the second pole, and the third connecting tab 31' of the second lead 3 'may be in direct contact with the housing 1, or, as shown in fig. 4, the second adapted fourth connecting tab 32' may be welded to the second side plate 12 (or the third side plate 13) of the housing 1 (the third connecting tab 31 'and the second outer tab 41' may not be provided). The second pole ear 22 and the housing 1 may also be connected in an insulating manner, specifically, an insulating sheet (insulating layer) may be provided for insulation.
In some embodiments, as shown in fig. 1 and fig. 3 to fig. 6, a third insulation sheet 5 'is further disposed between the second outer tab 41' and the first side plate 11, a fourth insulation sheet 6 'is further disposed between the second lead connector 3' and the first side plate 11, the second pole column penetrates through the third insulation sheet 5 'and the fourth insulation sheet 6', and a second insulation layer is disposed between the second pole column and the first side plate 11, so that the second outer tab 41', the second pole column, the second lead connector 3' and the second pole ear 22 are electrically connected and are in insulation connection with the first side plate 11 (housing 1).
The fourth insulation sheet 6 'may be located between the third connection sheet 31' and the first side plate 11, that is, the second outer connection sheet 41', the third insulation sheet 5', the first side plate 11, the fourth insulation sheet 6', and the third connection sheet 31' are sequentially stacked.
In addition, along the circumferential direction of the fifth through hole 30', the difference between the aperture of the fifth through hole 30' and the diameter of the pole is substantially equal to the width of the second insulating layer along the circumferential direction of the fifth through hole 30', and the circumferential direction of the fifth through hole 30' is perpendicular to the axial direction of the fifth through hole 30'. Specifically, the second insulation layer may be integrally formed with the third insulation sheet 5', the second insulation layer being formed by the third insulation sheet 5' protruding outward (protruding inward into the seventh through hole 120) from the side thereof close to the first side plate 11; alternatively, the second insulation layer may be integrally formed with the fourth insulation sheet 6', and the second insulation layer is formed by the fourth insulation sheet 6' protruding outward (protruding into the seventh through hole 120) from the side close to the first side plate 11.
Correspondingly, the third insulating sheet 5 'is provided with an eighth through hole 50', and the second pole column passes through the eighth through hole 50 'to realize penetration of the third insulating sheet 5'; the fourth insulation sheet 6 'is provided with sixth through holes 60', and the second pole penetrates through the sixth through holes 60 'to achieve penetration of the fourth insulation sheet 6'. Specifically, the second pole sequentially passes through the eighth through hole 50', the seventh through hole 120, the sixth through hole 60', and the fifth through hole 30 'to be connected with the second guiding member 3'. Among them, the eighth through hole 50', the seventh through hole 120, the sixth through hole 60', and the fifth through hole 30' may be coaxially disposed.
Further, the projection of the third insulation sheet 5 'on the first side plate 11 may cover the projection of the second outer tab 41' on the first side plate 11 (i.e., the projection of the second outer tab 41 'on the first side plate 11 is located within the projection of the third insulation sheet 5' on the first side plate 11). The projection of the fourth insulation sheet 6 'on the first side plate 11 can cover the projection of the third connection sheet 31' on the first side plate 11, thereby further improving the performance of the battery, such as safety and stability.
Specifically, the fourth insulation sheet 6' may be an L-shaped structure including a third insulation portion 61' and a fourth insulation portion 62'; the third insulating part 61' is located between the first side plate 11 and the second connecting part 3', and the second pole column penetrates through the third insulating part 61' (i.e. the sixth through hole 60' is arranged on the third insulating part 61 '); the fourth insulating portion 62 'is located between the second side plate 12 and the second lead connector 3', and specifically may be located between the second side plate 12 and the fourth connecting piece 32', that is, the second side plate 12, the fourth insulating portion 62', and the fourth connecting piece 32 'are sequentially stacked, so that the fourth insulating portion 62' can support the second lead connector 3', and can insulate the second lead connector 3' from the second side plate 12 of the housing 1, thereby improving the safety, stability, and other performances of the battery.
The projection of the third insulating portion 61 'on the first side plate 11 covers the projection of the second connecting piece 3' on the first side plate 11 (covers the projection of the third connecting piece 31 'on the first side plate 11), and the projection of the fourth insulating portion 62' on the second side plate 12 covers the projection of the second connecting piece 3 'on the second side plate 12 (covers the projection of the fourth connecting piece 32' on the second side plate 12).
In addition, an included angle is formed between the surface of the third insulating portion 61 'contacting the third connecting piece 31' and the surface of the fourth insulating portion 62 'contacting the fourth connecting piece 32', and the included angle may range from 80 ° to 140 °, such as 80 °, 90 °, 100 °, 110 °, 120 °, 130 °, 140 °, and the like, i.e., the included angle is not parallel, such as perpendicular. The included angle formed between the third insulating portion 61 'and the fourth insulating portion 62' (the plane in which they lie) may range from 80 ° to 140 °, e.g. 80 °, 90 °, 100 °, 110 °, 120 °, 130 °, 140 °, etc., i.e. they are not parallel, e.g. perpendicular.
Specifically, the first pole lug and the second connecting piece 32 may be welded, and the second pole lug and the fourth connecting piece may be welded.
In addition, the battery can also include buffer sheet 9, buffer sheet 9 is located between electric core 2 and first curb plate 11, specifically can be located between extension 23 and first curb plate 11, and between first connection piece 31 and first connecting portion 211, between third connection piece 31' and third connecting portion 221, can avoid electric core 2 and casing 1 contact from this, can play the cushioning effect when taking place the striking between electric core 2 and the first curb plate 11 simultaneously, avoid electric core 2 or casing 1 damage, improve the anti-falling and anti-striking ability of battery, and then improve performances such as the security of battery. In addition, the buffer sheet can also play an insulating role.
In some embodiments, the buffering sheet 9 includes a first buffering portion 91 and a second buffering portion 92 connected with each other, the first buffering portion 91 is located between the extending portion 23 and the first side plate 11, and the second buffering portion 92 is located between the first connecting portion 211 of the first tab 21 and the first connecting piece 31 of the first guide.
The buffer piece 9 further includes a third buffer portion 93 connected to the first buffer portion 91, and the third buffer portion is located between the third connection portion 221 of the second tab 22 and the third connection piece 31 'of the second lead 3'.
Specifically, the width of the first buffer portion 91 is greater than or equal to the width of the second buffer portion 92, the width of the first buffer portion 91 is greater than or equal to the width of the third buffer portion 93, and the width of the second buffer portion 92 and the width of the third buffer portion 93 may be equal to or different from each other. Here, the width of the first buffer portion 91, the width of the second buffer portion 92, and the width of the third buffer portion 93 refer to the width in the direction along the third side plate 13 to the second side plate 12.
Generally, the second buffer portion 92 is provided with a first groove into which the second connection portion 212 of the first tab 21 extends. In some embodiments, along the length direction of the battery cell 2 (the direction from the battery cell 2 to the first side plate 11), the end of the second connection portion 212 of the first tab 21 extends out of the first groove, so as to facilitate connection with the first guide.
Specifically, a projection of the first buffer portion 91 in the thickness direction of the battery cell 2 (i.e., a projection perpendicular to the thickness direction of the battery cell 2) overlaps with the second connection portion 212 of the first tab 21 and a projection of the first guide (the second connection piece 32) in the thickness direction of the battery cell 2. The length of the first groove in the width direction of the battery cell 2 is greater than or equal to the length of the second connection portion 212 of the first tab 21 in the width direction of the battery cell 2. The length of the first groove in the thickness direction of the battery cell 2 is greater than or equal to the length of the second connection portion 212 of the first tab 21 in the thickness direction of the battery cell 2.
In addition, the third buffer portion 93 is provided with a second groove into which the fourth connection portion 222 of the second tab 22 extends. In some embodiments, the end of the fourth connection portion 222 of the second tab 22 extends out of the second groove along the length direction of the battery cell 2, so as to facilitate connection with the second lead connector 3'.
Specifically, the second buffer portion 92 is present on at least one of the side of the second connecting portion 212/first pole ear plate facing away from the second side plate (i.e., between the second connecting portion 212/first pole ear plate and the third side plate 13), the side of the second connecting portion 212/first pole ear plate facing toward the second side plate (i.e., between the second connecting portion 212/first pole ear plate and the second side plate 13), the third buffer portion 93 is present on at least one of the side of the fourth connecting portion 222/second pole ear plate facing away from the second side plate (i.e., between the fourth connecting portion 222/second pole ear plate and the third side plate 13), and the side of the fourth connecting portion 222/second pole ear plate facing toward the second side plate (i.e., between the fourth connecting portion 222/second pole ear plate and the second side plate 13).
Specifically, a projection of the third buffer portion 93 in the thickness direction of the battery cell 2 overlaps with a projection of the fourth connection portion 222 of the second tab 22 and the second lead 3 '(the fourth connection piece 32') in the thickness direction of the battery cell 2. The length of the second groove in the width direction of the battery cell 2 is greater than or equal to the length of the fourth connection portion 222 of the second tab 22 in the width direction of the battery cell 2. The length of the second groove in the thickness direction of the battery cell 2 is greater than or equal to the length of the fourth connecting portion 222 of the second tab 22 in the thickness direction of the battery cell 2.
Further, the length of the second groove in the width direction of the battery cell 2 may be equal to or different from the length of the first groove in the width direction of the battery cell 2, and the length of the second groove in the thickness direction of the battery cell 2 may be equal to or different from the length of the first groove in the thickness direction of the battery cell 2.
In addition, the width of the battery cell 2 is a, the length of the buffer sheet 9 in the width direction of the battery cell 2 is b, | a-b | is more than or equal to 0 and less than or equal to 3, a is more than or equal to b, or a is more than or equal to b.
The battery cell 2 has a first face and a second face which are oppositely arranged, and a side face located between the first face and the second face, and a first protective adhesive layer 71 is arranged on at least a partial area of the side face of at least one side of the battery cell 2.
Specifically, a side surface between the first surface and the second surface of the cell 2 (a side surface of the cell 2) is a side surface where outer edges of the pole pieces in the cell 2 are exposed, and is formed by end surfaces of a plurality of pole pieces arranged in a stacked manner, which are perpendicular to a thickness direction of the pole pieces, that is, the side surface of the cell 2 is parallel to the thickness direction of the cell 2 (also, the thickness direction of the pole pieces).
The side surfaces of the battery cell 2 include a first side surface, a second side surface, a third side surface and a fourth side surface which are connected in sequence, the first side surface is a terminal surface of the battery cell 2 facing the first side plate 11 (i.e., a surface of the battery cell 2 provided with the first tab 21 and the second tab 22, and is also a surface of the battery cell 2 facing the first side plate 11), the second side surface and the fourth side surface are located on two opposite sides of the first side surface (or the third side surface), and the first side surface and the third side surface are located on two opposite sides of the second side surface (or the fourth side surface). The first side surface and the third side surface may be parallel to each other, the second side surface and the fourth side surface may be parallel to each other, the first side surface (or the third side surface) and the second side surface (or the fourth side surface) may be perpendicular to each other, a direction from the first side surface to the third side surface may be a length direction of the battery cell 2, and a direction from the second side surface to the fourth side surface may be a width direction of the battery cell 2, or a direction from the first side surface to the third side surface may also be a width direction of the battery cell 2, and a direction from the second side surface to the fourth side surface may be a length direction of the battery cell 2.
At least one of the second side surface, the third side surface, and the fourth side surface is provided with the first protective adhesive layer 71, that is, one or more (e.g., all) of them are provided with the first protective adhesive layer 71, but not limited thereto, the first side surface may also be provided with the first protective adhesive layer 71.
In addition, the number of the first protective adhesive layers 71 on any one side surface of the battery core 2 may be one or more, and when the number of the first protective adhesive layers 71 on any one side surface is one, the length of the first protective adhesive layers 71 on the side surface in the length direction of the side surface may not be greater than the length of the side surface, for example, is substantially equal; when the number of the first protective adhesive layers 71 on any one side surface is multiple, the multiple first protective adhesive layers 71 are arranged on the side surface of the battery core 2 at intervals, so that a gap exists between any two adjacent first protective adhesive layers 71, and the gap is favorable for the electrolyte to infiltrate into the pole pieces in the battery core 2, so that the battery performance is further optimized.
Taking the second side as an example, when the number of the first protective adhesive layers 71 on the second side is one, the length of the first protective adhesive layers 71 on the second side in the length direction of the second side may not be greater than the length of the second side, for example, is substantially equal to the length of the second side; when the number of the first protective adhesive layers 71 on the second side is multiple, the multiple first protective adhesive layers 71 can be distributed at intervals on the second side.
In some embodiments, the first protective adhesive layer 71 extends to the first surface of the battery cell 2 and is bonded to the pole piece located on the first surface of the battery cell 2 and/or extends to the second surface of the battery cell 2 and is bonded to the pole piece located on the second surface of the battery cell 2, so that the pole piece exposed on the side surface of the battery cell 2 can be prevented from contacting the casing 1, and meanwhile, the battery cell 2 can be fixed, and the safety, stability and other performances of the battery can be improved.
In addition, the first protective adhesive layer 71 may be provided with one or more ninth through holes, and preferably, a plurality of fifth through holes 30' are provided, and the plurality of fifth through holes 30' may be uniformly or non-uniformly distributed on a portion of the first protective adhesive layer 71 opposite to the side surface of the battery cell 2 (the portion of the first protective adhesive layer 71 is overlapped on the side surface (e.g., the second surface) of the battery cell 2), so that the wettability of the electrolyte to the battery cell 2 may be improved through the fifth through holes 30', the electrolyte may be better infiltrated into the electrode sheet, and the battery performance may be further optimized. Especially when the number of the first protective adhesive layers 71 on any one side of the battery cell 2 is one, the first protective adhesive layers 71 on the side may be provided with one or more fifth through holes 30'.
In addition, the first surface of the extension portion 23 and/or the second surface of the extension portion 23 is provided with a second protective glue layer 72. Wherein, a direction from the first face of the extension portion 23 to the second face of the extension portion 23 may be perpendicular to a direction from the first tab 21 to the extension portion 23.
Specifically, the first protective adhesive layer 71 and the second protective adhesive layer 72 may be specifically adhesive paper, generally having insulation property and adhesiveness, which may be adhesive paper that is conventional in the art, and is not particularly limited.
Specifically, the first tab 21 and the second tab 22 are disposed on the end surface of the electric core 2 facing the first side plate 11, the first surface of the electric core 2 and the second surface of the electric core 2 are respectively located on two opposite sides of the end surface of the electric core 2 facing the first side plate 11, the direction from the first surface of the electric core 2 to the second surface of the electric core 2 is the thickness direction of the electric core 2 (also the thickness direction of the electrode plate), the first surface of the electric core 2 (surface), the second surface of the electric core 2 (surface) and the surface of the pole piece can be parallel (perpendicular to the thickness direction of the pole piece).
The pole pieces located on the first surface of the battery cell 2 and the pole pieces located on the second surface of the battery cell 2 are respectively the pole pieces on the outermost side of the battery cell 2, that is, the rest of the pole pieces are stacked between the pole pieces located on the first surface of the battery cell 2 and the pole pieces located on the second surface of the battery cell 2. The polarity of the electrode sheet located on the first surface of the battery cell 2 may be the same as or different from that of the electrode sheet located on the second surface of the battery cell 2, and may be a positive electrode sheet or a negative electrode sheet, and may be a first electrode sheet or a second electrode sheet, and it is generally preferable that the electrode sheet located on the first surface of the battery cell 2 and the electrode sheet located on the second surface of the battery cell 2 are negative electrode sheets.
The battery cell 2 may include a laminated battery cell 2 and/or a wound battery cell 2, where the wound battery cell 2 is formed by stacking a plurality of electrode sheets and then winding the electrode sheets, and specifically is formed by stacking a first pole piece, a diaphragm, and a second pole piece in sequence and then winding the electrode sheets; 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.
Specifically, the casing 1 may include a first side plate 11, a second side plate 12, a third side plate 13, a fourth side plate 14, a fifth side plate 15, and a sixth side plate 16, where the first side plate 11, the fourth side plate 14, the fifth side plate 15, and the sixth side plate 16 are sequentially connected to each other and respectively located between the second side plate 12 (or called bottom plate) and the third side plate 13 (or called cover plate), so as to form a closed cavity, and the battery cell 2 is disposed in the cavity. The first side plate 11 and the fifth side plate 15 are located on two opposite sides of the fourth side plate 14 (or the sixth side plate 16), the fourth side plate 14 and the sixth side plate 16 are located on two opposite sides of the first side plate 11 (or the fifth side plate 15), and the third side plate 13 and the second side plate 12 are located on two opposite sides of the first side plate 11 (or the fourth side plate 14, or the fifth side plate 15, or the sixth side plate 16), respectively. The direction of the third side plate 13 to the second side plate 12 is the thickness direction of the housing 1, the direction of the first side plate 11 to the fifth side plate 15 may be the length direction of the housing 1, and the direction of the fourth side plate 14 to the sixth side plate 16 is the width direction of the housing 1, or the direction of the first side plate 11 to the fifth side plate 15 is the width direction of the housing 1, and the fourth side plate 14 to the sixth side plate 16 is the length direction of the housing 1. One of the first face of the cell 2 and the second face of the cell 2 is a face of the cell 2 facing the third side plate 13, and the other is a face of the cell 2 facing the second side plate 12.
The first side plate 11 and the fourth side plate 14, the fourth side plate 14 and the fifth side plate 15, and the fifth side plate 15 and the sixth side plate 16 may be connected by an arc transition portion 17, that is, the connection portion of two adjacent side plates is in arc transition. Specifically, the side of the circular arc transition portion 17 that faces away from the cavity and the side that faces the cavity in cross section perpendicular to the first direction that is parallel to the direction from the third side plate 13 to the second side plate 12 (i.e., the thickness direction of the housing 1) are both arcs that form a groove that opens toward the cavity.
The case 1 may further include a thinned portion 131, and the mechanical strength of the thinned portion 131 is smaller than that of the other portions of the case 1 except for the thinned portion 131, so that when the internal pressure of the battery is too high, the pressure may be preferentially released through the thinned portion 131 to prevent the battery from exploding. Specifically, the thinned portion 131 may be provided on the third side plate 13. Specifically, the thickness of the thinned portion 131 is smaller than the thickness of the other portions of the housing 1 except for the thinned portion 131.
In addition, still be equipped with on casing 1 and annotate liquid hole 100 and be used for sealed sealing plate of annotating liquid hole 100, annotate liquid hole 100 and be used for annotating the electrolyte into the cavity, after pouring into the electrolyte, seal annotating liquid hole 100 with the sealing plate, this sealing plate can include the sheetmetal, and it can weld with casing 1 around annotating liquid hole 100 to seal annotating liquid hole 100.
Specifically, the liquid injection hole 100 may be disposed on the first side plate 11, specifically, between the connecting portion (or the first outer connecting piece 41) between the first side plate 11 and the second connecting piece 3 'and the connecting portion (or the second outer connecting piece 41') between the first side plate 11 and the first connecting piece, the sealing sheet may be welded to a side of the first side plate 11 away from the cavity, specifically, to a portion of the first side plate 11 located at the periphery of the liquid injection hole 100, so as to seal the liquid injection hole 100.
Further, the welding as described above may specifically be laser welding.
The housing 1 may be a metal packaging case, that is, it may be made of metal, that is, the first side plate 11, the second side plate 12, the third side plate 13, the fourth side plate 14, the fifth side plate 15, and the sixth side plate 16 may be made of metal, such as aluminum, aluminum alloy, nickel, iron, or nickel-iron alloy.
Generally, when the housing 1 is electrically connected to the positive tab, the housing 1 may be made of a material having the same polarity as the positive tab, such as aluminum or an aluminum alloy, and the specific material types of the two may be the same or different (the material of the two is different, such as the material of the positive tab is aluminum, and the material of the housing 1 is an aluminum alloy); when the casing 1 is electrically connected to the negative electrode tab, the casing 1 and the negative electrode tab are made of the same polarity material, such as nickel, iron or nickel-iron alloy, and the specific material types of the casing 1 and the negative electrode tab may be the same or different.
In addition, the material of the first guiding and connecting element and the material of the first tab 21 may be the same polarity material, for example, the first tab 21 is a positive tab, the material of the first guiding and connecting element and the material of the first tab 21 may be aluminum or aluminum alloy, and the specific material types may be the same or different. The material of the second connecting piece 3 'and the material of the second tab 22 may be the same polarity material, for example, the second tab 22 is a negative tab, the material of the second connecting piece 3' and the material of the second tab 22 may be nickel, iron or nickel-iron alloy, respectively, and the specific material types may be the same or different.
The embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiment. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (36)
1. A battery, comprising:
the shell is enclosed into a cavity; the housing comprises a first side plate;
the battery cell is located in the cavity, the battery cell is equipped with first utmost point ear towards one side of first curb plate and to the extension that first curb plate extends, first utmost point ear with one side that the battery cell meets extremely the distance of first curb plate is greater than the extension extremely the distance of first curb plate.
2. The battery of claim 1, wherein a projection of the first tab on the first side plate does not overlap a projection of the extension on the first side plate.
3. The battery of claim 1, further comprising a sixth side plate connected to the first side plate, wherein a projection of the first tab on the sixth side plate at least partially overlaps a projection of the extension on the sixth side plate.
4. The battery of claim 1, further comprising a first lead located within the cavity, the first lead being electrically connected to the first tab; the first guide connecting piece comprises a second connecting piece, and the first electrode lug comprises a second connecting portion connected with the second connecting piece.
5. The battery of claim 4, wherein the battery core comprises a plurality of pole pieces arranged in a stacked manner, and a surface of the first tab where the second connecting portion is connected with the second connecting portion of the first connecting guide member is substantially parallel to an extending direction of the pole pieces.
6. The cell defined in claim 1, further comprising a first lead electrically connected to the first tab, the first lead being located in the cavity, the first lead comprising a second tab; the shell comprises a second side plate connected with the first side plate, the first tab comprises a first connecting part and a second connecting part which are connected, the first connecting part is connected with the battery cell, wherein,
one side of the second connecting part, which is far away from the second side plate, is connected with the second connecting piece;
or one side of the second connecting part facing the second side plate is connected with the second connecting piece.
7. The battery of any of claims 4-6, wherein the cell comprises a first pole piece, a second pole piece, and a diaphragm located between the first pole piece and the second pole piece, which are sequentially stacked, and the first tab is disposed on the first pole piece;
a plurality of the second connecting parts of the first pole lug are sequentially attached to form a first pole lug plate, and the first pole lug plate is connected with the first guide connecting piece.
8. The battery of claim 7, wherein the housing comprises a second side plate and a third side plate connected to the first side plate, the second side plate being disposed opposite the third side plate;
the second connecting part of the first pole ear is attached towards the direction close to the second side plate to form the first pole ear plate, or,
the second connecting part of the first tab is attached towards the direction close to the third side plate to form the first tab plate, or,
the second connecting portion of the first pole lug faces to the central line in the thickness direction of the battery cell, and the first pole lug plate is formed.
9. The battery of claim 7, wherein a distance from the first pole ear plate to the first side plate is greater than or equal to a distance from the extension portion to the first side plate in a direction from the battery cell to the first side plate.
10. The battery according to claim 6,
the first connecting piece also comprises a first connecting piece connected with the second connecting piece, and the first connecting piece is positioned between the first side plate and the first connecting part of the first lug; and/or the presence of a gas in the gas,
the second connecting piece is positioned between the second side plate and the second connecting part of the first tab; and/or the presence of a gas in the gas,
a first included angle is formed between one surface of the first connecting portion, which is connected with the battery cell, and one surface of the second connecting portion, which is connected with the second connecting sheet, and the range of the first included angle is 80-120 degrees.
11. The battery according to claim 10,
a second included angle is formed between the plane where the first connecting sheet is located and the plane where the second connecting sheet is located, and the range of the second included angle is 80-120 degrees.
12. The battery of claim 6, wherein a distance from the second connecting portion of the first tab to the second side plate is greater than or equal to a distance from the cell to the second side plate.
13. The cell defined in any one of claims 1-6, further comprising a first lead electrically connected to the first tab, the first lead being located within the cavity; the casing also comprises a second side plate, and the projection of the first guide piece on the second side plate is not overlapped with the projection of the extension part on the second side plate.
14. The battery according to any one of claims 1 to 6,
the battery also comprises a first guide connecting piece electrically connected with the first tab, the first guide connecting piece is positioned in the cavity, and the first guide connecting piece comprises a first connecting piece;
the battery is still including setting up first curb plate deviates from the first outer splicing of one side of cavity, first outer splicing includes the first utmost point post of outside protruding formation, first splicing include with the first through-hole that first utmost point post corresponds the setting, first utmost point post pierces through first curb plate, and pass through first through-hole with first splicing meets.
15. The battery of claim 14, wherein the first through-hole of the first connection tab comprises a first hole segment and a second hole segment connected to each other, the second hole segment being located on a side of the first hole segment adjacent to the cell;
one end, close to the battery cell, of the first pole column extends outwards to form a first extending portion corresponding to the second hole section.
16. The battery of claim 14, wherein an end surface of the first terminal adjacent to the cell is flush with a side surface of the first connection tab adjacent to the cell.
17. The battery of claim 14, wherein one end of the first terminal column close to the cell extends out of the first through hole and is formed with a first outer extension portion connected to one side surface of the first connecting piece close to the cell, and the first outer extension portion extends outwards along the circumferential direction of the first through hole.
18. The battery according to claim 14,
a first insulating sheet is further arranged between the first outer connecting sheet and the first side plate, a second insulating sheet is further arranged between the first connecting piece and the first side plate, and the first pole penetrates through the first insulating sheet and the second insulating sheet; and/or the presence of a gas in the gas,
a first insulating layer is arranged between the first pole column and the first side plate.
19. The battery of claim 18 wherein the projection of the first insulating tab on the first side plate overlaps the projection of the first outer tab on the first side plate.
20. The battery according to claim 18 or 19,
the shell further comprises a second side plate connected with the first side plate, and the second insulation sheet comprises a first insulation part and a second insulation part; the first insulating part is positioned between the first side plate and the first guide connecting piece, and the first pole penetrates through the first insulating part; the second insulating part is positioned between the second side plate and the first guide connecting piece.
21. The battery of claim 20, wherein a projection of the second insulating portion on the second side plate covers a projection of the first lead on the second side plate, and/or,
the projection of the first insulating part on the first side plate covers the projection of the first guide connecting piece on the first side plate.
22. The battery according to claim 1,
the number of the extension parts is at least two, and the first tab is positioned between two adjacent extension parts; and/or the presence of a gas in the atmosphere,
the length of the extension part in the thickness direction of the battery cell is equal to the thickness of the battery cell.
23. The battery of claim 1, wherein a second tab is further disposed on a side of the battery cell facing the first side plate, and the second tab has a polarity opposite to that of the first tab.
24. The battery of claim 23,
the distance from one side, connected with the battery cell, of the second lug to the first side plate is larger than the distance from the extension part to the first side plate; and/or the presence of a gas in the gas,
the battery also comprises a second lead connector electrically connected with the second pole lug, and the second lead connector is positioned in the cavity; the second guide connecting piece comprises a third connecting piece and a fourth connecting piece, the third connecting piece is positioned between the first side plate and the second lug, and the second lug comprises a fourth connecting part connected with the fourth connecting piece; and/or the presence of a gas in the gas,
the battery also comprises a second lead piece electrically connected with the second pole lug, and the second lead piece is positioned in the cavity; the second guide connecting piece comprises a fourth connecting piece, and the second tab comprises a fourth connecting part connected with the fourth connecting piece; the battery cell comprises a plurality of pole pieces which are arranged in a stacked mode, and one surface, connected with the fourth connecting piece of the second guide connecting piece, of the fourth connecting portion of the second pole lug is basically parallel to the extending direction of the pole pieces.
25. The battery of claim 23,
the extension part is arranged between the second tab and the first tab; and/or the presence of a gas in the atmosphere,
the number of the extension parts is at least two, and the second pole ear is positioned between two adjacent extension parts; and/or the presence of a gas in the gas,
the projection of the second tab on the first side plate is not overlapped with the projection of the extension part on the first side plate; and/or the presence of a gas in the gas,
the projection of the second tab on the first side plate is not overlapped with the projection of the first tab on the first side plate; and/or the presence of a gas in the gas,
the shell further comprises a sixth side plate connected with the first side plate, and the projection of the second tab on the sixth side plate is at least partially overlapped with the projection of the extension part on the sixth side plate; and/or the presence of a gas in the atmosphere,
the shell further comprises a sixth side plate connected with the first side plate, and the projection of the second tab on the sixth side plate is at least partially overlapped with the projection of the first tab on the sixth side plate.
26. The battery of claim 1, further comprising a buffer sheet located between the extension and the first side plate.
27. The battery of claim 10, further comprising a buffer sheet comprising a first buffer and a second buffer connected, the first buffer being located between the extension and the first side plate, the second buffer being located between the first connection of the first tab and the first connection tab of the first guide.
28. The battery of claim 27,
the width of the first buffer part is greater than or equal to that of the second buffer part; and/or the presence of a gas in the gas,
the second buffer part is provided with a first groove, and the second connecting part of the first tab extends into the first groove.
29. The battery of claim 28, wherein a projection of the second buffer portion in the thickness direction of the cell overlaps with the second connecting portion of the first tab and a projection of the first lead member in the thickness direction of the cell; and/or the presence of a gas in the gas,
the length of the first groove in the width direction of the battery cell is greater than or equal to the length of the second connecting part of the first tab in the width direction of the battery cell; and/or the presence of a gas in the atmosphere,
the length of the first groove in the thickness direction of the battery cell is greater than or equal to the length of the second connecting part of the first tab in the thickness direction of the battery cell; and/or the presence of a gas in the atmosphere,
along the length direction of the battery core, the end part of the second connecting part of the first tab extends out of the first groove.
30. The battery of any one of claims 26-29, wherein the cell has a width a, and the buffer sheet has a length b in the width direction of the cell, and 0 ≦ a-b ≦ 3.
31. The battery of claim 1, wherein the cell has a first face and a second face opposite to each other, and a side face located between the first face and the second face, and a first protective adhesive layer is provided on at least a partial area of the side face on at least one side of the cell.
32. The battery of claim 31, wherein the cell comprises a plurality of pole pieces arranged in a stack, and wherein the first protective adhesive layer on the side surface of the cell extends to and bonds with the pole pieces on the first side of the cell and/or extends to and bonds with the pole pieces on the second side of the cell.
33. The battery of claim 31 or 32, wherein the number of the first protective adhesive layers is multiple, and the multiple first protective adhesive layers are arranged on the side surface of the battery cell at intervals.
34. The battery of claim 1, wherein the extension has a first face and a second face opposite to the first face, and the first face of the extension and/or the second face of the extension is provided with a second protective adhesive layer.
35. The battery of claim 34 wherein a direction from the first face of the extension to the second face of the extension is perpendicular to a direction from the first tab to the extension.
36. The battery according to claim 1,
the first tab is a positive tab or a negative tab; and/or the presence of a gas in the atmosphere,
the battery cell comprises a laminated battery cell or a winding battery cell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220670712.4U CN218069948U (en) | 2022-03-26 | 2022-03-26 | Battery with a battery cell |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220670712.4U CN218069948U (en) | 2022-03-26 | 2022-03-26 | Battery with a battery cell |
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| Publication Number | Publication Date |
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| CN218069948U true CN218069948U (en) | 2022-12-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202220670712.4U Active CN218069948U (en) | 2022-03-26 | 2022-03-26 | Battery with a battery cell |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023226518A1 (en) * | 2022-05-25 | 2023-11-30 | 珠海冠宇电池股份有限公司 | Battery and electronic device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023226518A1 (en) * | 2022-05-25 | 2023-11-30 | 珠海冠宇电池股份有限公司 | Battery and electronic device |
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