CN114678594A

CN114678594A - Battery with a battery cell

Info

Publication number: CN114678594A
Application number: CN202210304862.8A
Authority: CN
Inventors: 卫志达; 谢继春
Original assignee: Zhuhai Cosmx Battery Co Ltd
Current assignee: Zhuhai Cosmx Battery Co Ltd
Priority date: 2022-03-26
Filing date: 2022-03-26
Publication date: 2022-06-28
Also published as: WO2023185218A1

Abstract

The present invention provides 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 towards one side of first curb plate is equipped with first utmost point ear, the battery cell with be equipped with the separation piece between the first curb plate, first utmost point ear include to the second connecting portion that first curb plate extends, the separation piece includes second separation portion, second separation portion is equipped with first recess, the second connecting portion of first utmost point ear extend to in the first recess. The invention can improve the performances of the battery such as safety and the like.

Description

Battery with a battery cell

Technical Field

The invention relates to the field of electrochemical energy storage devices, in particular to a battery.

Background

At present, electrochemical devices represented by batteries are widely used, for example, lithium ion batteries have the advantages of large capacity, small volume, light weight, environmental protection and the like, and are widely used in industries such as digital electronic products and electric automobiles. With the development of technology, the requirements for the performance of batteries, such as safety, are also increasing, and therefore, improvements in the performance of batteries, such as stability and safety, are urgently needed.

Disclosure of Invention

The invention provides a battery, which can improve the performances of stability, safety and the like of the battery.

The present invention provides a battery comprising: the shell is enclosed into a cavity; the housing comprises a first side plate; the electric core is located in the cavity, the electric core towards one side of first curb plate is equipped with first utmost point ear, the electric core with be equipped with the separation piece between the first curb plate, first utmost point ear include to the second connecting portion that first curb plate extends, the separation piece includes second separation portion, second separation portion is equipped with first recess, the second connecting portion of first utmost point ear extend to in the first recess.

According to an embodiment of the present invention, the first tab further includes a first connection portion connected to the second connection portion, the first connection portion is connected to the battery cell, and the first connection portion is located between the battery cell and the blocking piece.

According to an embodiment of the present invention, a projection of the first connecting portion on the first side plate at least partially overlaps a projection of the blocking tab on the first side plate.

According to an embodiment of the present invention, a first included angle is formed between a surface of the first connection portion and a surface of the second connection portion, and the first included angle is in a range of 80-120 °.

According to an embodiment of the present invention, a projection of the second blocking portion in the thickness direction of the battery cell overlaps with a projection of the second connecting portion of the first tab 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 an embodiment of the present invention, the battery further includes a first junction piece electrically connected to the first tab, the first junction piece is located in the cavity, the first junction piece includes a first connection piece, the first tab includes a first connection portion connected to the second connection portion, the first connection portion is connected to the battery cell, the first connection piece is located between the first side plate and the first connection portion, and the blocking piece is located between the first connection piece and the first connection portion.

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 is located in the cavity, the first connecting piece further includes a second connecting piece connected to the second connecting portion, and a projection of the blocking piece on the first side plate does not cover a projection of the second connecting piece on the first side plate.

According to an embodiment of the present invention, the battery further includes a first adaptor located in the cavity, 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, 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 adapter.

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, the second side plate being disposed opposite to the third side plate; 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 of thickness direction of electric core forms first utmost point otic placode.

According to an embodiment of the present invention, the battery further includes a first tab electrically connected to the first tab, the first tab being located within the cavity, the first tab including a first connecting tab; 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 tab 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 of the first pole column, which is close to the battery core, extends outwards to form a first extending portion which corresponds to the second hole section.

According to an embodiment of the present invention, an end surface of the first terminal close to the battery cell is flush with a side surface of the first connection tab close to the battery cell.

According to an embodiment of the present invention, one end of the first terminal close to the battery cell extends out of the first through hole, and a first extending portion connected to one side surface of the first connecting piece close to the battery cell is formed to extend outward along a circumferential direction of the first through hole.

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 pole 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 an embodiment of the present invention, a projection of the first insulating sheet on the first side plate covers a projection of the first outer connecting sheet on the first side plate; and/or the first insulating layer is formed by outwards protruding one side, close to the first side plate, of the first insulating sheet, or formed by outwards protruding one side, close to the first side plate, of the second insulating sheet.

According to an embodiment of the present invention, the battery further includes a second side plate connected to the first side plate, the second insulation sheet including a first insulation portion and a second insulation portion; the first insulation part is positioned between the first side plate and the first adapter, and the first pole penetrates through the first insulation part; the second insulating part is located between the second side plate and the first adapter.

According to an embodiment of the present invention, a projection of the second insulating portion on the second side plate covers a projection of the first adaptor on the second side plate, and/or a projection of the first insulating portion on the first side plate covers a projection of the first adaptor on the first side plate; and/or the included angle between the first insulating part and the second insulating part ranges from 80 degrees to 120 degrees.

According to an embodiment of the present invention, a second tab is further disposed on a side of the battery cell facing the first side plate, and the second tab and the first tab have opposite polarities.

According to an embodiment of the present invention, a projection of the first tab on the first side plate does not overlap a projection of the second tab on the first side plate.

According to an embodiment of the present invention, the blocking sheet includes a third blocking portion, the third blocking portion is provided with a second groove, the second tab includes a fourth connecting portion extending toward the first side plate, and the fourth connecting portion of the second tab extends into the second groove.

According to an embodiment of the invention, the width of the battery cell is a, the length of the barrier sheet in the width direction of the battery cell is b, and | a-b | ≦ 3 is 0 ≦ a.

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.

In the invention, the barrier sheet between the first side plate and the battery core can play a role of buffering, so that the battery core is prevented from colliding with the first side plate (shell) to cause damage, the anti-falling capability of the battery is further improved, and the performances of the battery, such as stability, safety, service life and the like, are improved; meanwhile, the first pole lug is provided with a second connecting portion extending towards the first side plate, the second connecting portion extends into the first groove of the blocking piece, the first pole lug is convenient to be connected with a conductive structure such as an adapter through the second connecting portion, the electric property of the first pole lug is led out and connected with a peripheral circuit, the connection stability of the first pole lug and the peripheral circuit can be improved, and the performances of stability, safety and the like of the battery are further improved.

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 a battery cell according to an embodiment of the invention;

FIG. 3 is a schematic cross-sectional view of a portion of a battery showing a first terminal post in accordance with an embodiment of the present invention;

FIG. 4 is a schematic view illustrating a connection structure of the first adapter and the housing according to an embodiment of the present invention;

FIG. 5 is a schematic view illustrating a connection structure of the first adapter and the housing according to an embodiment of the present invention;

fig. 6 is an enlarged view of a partial region showing a connection structure of the first connector 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 portion; 222: a fourth connecting portion; 3': a second adaptor; 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 outer insulating 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 barrier sheet; 91: a first blocking portion; 92: a second barrier portion; 93: a third barrier portion.

Detailed Description

The present invention is described in further detail below in order to enable those skilled in the art to better understand the aspects of the present invention. The following detailed description is of the principles and features of the invention, and is intended to be illustrative only and not limiting in scope. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative effort 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 and may include, for example, a fixed connection, a detachable connection, and an integral connection; mechanical connection or electrical connection; the two elements may be connected directly or indirectly through an intermediate medium, or the two elements may be connected to each other. Those skilled in the art will understand what is specifically meant by the present invention. Furthermore, the terms "first", "second", "third", "fourth", and the like are used for descriptive purposes only, such as to distinguish between various components for clarity in explaining/explaining the technical solution, and are not to be construed as indicating or implying any number of technical features or order of significance.

The battery is a commonly used electrochemical energy storage device, and generally includes a casing, a battery cell enclosed in a cavity surrounded by the casing, and the like, where the battery cell is provided with a tab (e.g., a first tab described below), and the electrical property of the tab is generally led out through a conductive structure such as an adapter to connect with a peripheral circuit. However, when the battery falls or is impacted, the battery core often collides with the casing, and particularly when the casing such as a steel shell with high hardness is adopted, the connection structure of the battery core, the tab, the adapter and other conductive structures is damaged, and the stability, safety and other performances of the battery are affected.

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 towards one side of first curb plate 11, is equipped with separation piece 9 between electric core 2 and the first curb plate 11, and first utmost point ear 21 includes the second connecting portion 212 that extends to first curb plate 11, and separation piece 9 includes second separation portion 92, and second separation portion 92 is equipped with first recess, and the second connecting portion 212 of first utmost point ear 21 extends to in the first recess. The separation piece 9 can play the separation effect, avoids electric core 2 and the contact of first curb plate 11 (casing 1), can play the cushioning effect when taking place the striking simultaneously between electric core 2 and the first curb plate 11, avoids electric core 2 or 1 damage of casing, improves the anti falling and the anti striking ability of battery, and then improves performance such as the security of battery. In addition, the barrier sheet 9 can also play an insulating role, so that the safety, the stability and other performances of the battery are further improved.

In addition, the first tab 21 further includes a first connection portion 211 connected to the second connection portion 212, the first connection portion 211 is connected to the battery cell 2, and the first connection portion 211 is located between the battery cell 2 and the barrier sheet 9, and specifically may be located between the battery cell 2 and the second barrier portion 92.

Specifically, the projection of the first connecting portion 211 on the first side plate 11 may at least partially overlap with the projection of the barrier panel 9/the second barrier portion 92 on the first side plate 11.

In some embodiments, the first connection portion 211 and the second connection portion 212 form a first included angle therebetween, the first included angle ranging from 80 ° to 120 °, such as 80 °, 90 °, 100 °, 120 °, and so on.

In addition, the battery further comprises a first adapter electrically connected with the first tab 21, the first adapter is located in the cavity, the first adapter comprises a first connecting plate 31, the first connecting plate 31 is located between the first side plate 11 and the first tab 21, specifically, the first side plate 11 may be located between the first connecting portion 211, and the blocking plate 9 is located between the first connecting plate 31 and the first connecting portion 211.

Furthermore, the first connecting piece further comprises a second connecting piece 32 connected with the first connecting piece 31, the second connecting piece 32 is connected with the second connecting portion 212, the projection of the blocking piece 9 on the first side plate 11 may not cover the projection of the second connecting piece 32 on the first side plate 11, and the second connecting piece 32 is located on the side of the second connecting portion 212 facing away from the blocking piece 9/the first groove/the second blocking portion 92, for example.

In general, the projection of the second connecting portion 212 of the first tab 21 on the first side plate 11 contacts the projection of the second connecting piece 32 of the first connecting piece on the first side plate 11, but the rest parts except the contact boundary do not overlap each other.

The battery cell 2 includes pole pieces stacked in sequence, a surface of the second connection portion 212 connected to the second connection piece 32 is substantially parallel to a surface of the pole piece, specifically, the second connection portion 212 is stacked to the second connection piece 32, and a surface of the second connection portion 212 and a surface of the second connection piece 32 are substantially parallel to a surface of the pole piece.

The battery cell 2 is further provided with a second tab 22 on one side facing the first side plate 11, 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 battery cell 2, so that the cavity space is further saved, and the energy density and other performances of the battery 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.

In addition, an extension portion 23 extending towards the first side plate is further arranged on one side of the battery cell 2 facing the first side plate, a distance from one side, where the first tab 21 is connected with the battery cell 2, to the first side plate 11 is greater than a distance from the extension portion 23 to the first side plate 11, a distance from one side, where the second tab 22 is connected with the battery cell 2, to the first side plate 11 is greater than a distance from the extension portion 23 to the first side plate 11, and a distance from one side, where the second tab 22 is connected with the battery cell 2, to the first side plate 11 and a distance from one side, where the first tab 21 is connected with the battery cell 2, to the first side plate 11 may be equal or unequal, preferably substantially equal. From this, utilize the cavity space between electric core 2 and the first curb plate 11, set up extension 23, through extending, 23 increase electric core 2's volume, and then improve the performance such as energy density of 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 an end surface of the first area to the first side plate 11 and a distance from an end surface of the second area to the first side plate 11 are respectively smaller than a distance from an 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 about the same level with the first face of electric core 2, and the second face of extension 23 is about the same level with the second face of electric core 2.

In addition, the number of the extending portions 23 may be at least two, the first tab 21 may be located between two adjacent extending portions 23, the second tab 22 may also be located between two adjacent extending portions 23, and there is an extending 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 extending portion 23). The number of the first tabs 21 is n1, the number of the second tabs 22 is n2, the number of the extending portions 23 is n3, n1 and n2 may be equal or different, n3 is n1+ n2+1, and illustratively, n1 is 1, n2 is 1, and n3 is 3.

Specifically, the barrier panel 9 is located between the extension 23 and the first side plate 11.

In some embodiments, the housing 1 includes a second side plate 12 connected to the first side plate 11, and a side of the second connecting portion 212 facing away from the second side plate 12 is connected to the first connecting portion, and in particular may be connected to the second connecting portion 32 of the first connecting portion, that is, the second side plate 12, the second connecting portion 212, and the second connecting portion 32 are sequentially stacked, and the second connecting portion 212 is located between the second side plate 12 and the second connecting portion 32; alternatively, one side of the second connecting portion 212 facing the second side plate 12 is connected to the first connecting portion, and specifically, the second connecting portion 32 of the first connecting portion may be connected to the second connecting portion 32 of the first 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 adapter can be improved, the cavity space is saved, and the energy density and other performances of the battery are improved.

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 part 211 of the first tab 21 may be perpendicular to the surface of the second connection part 212, wherein the surface of the first connection part 211 may be perpendicular to the surface of the pole piece, and the surface of the second connection part 212 may be parallel to the surface of the pole piece.

Specifically, an included angle formed between a surface of the first connection portion 211 contacting the battery cell 2 and a surface of the second connection portion 212 contacting the second connection piece 32 ranges from 80 ° to 120 °, for example, 80 °, 90 °, 100 °, 120 °, and the like.

Further, the distance between the first connection piece 31 and the first connection portion 211 may be equal to or greater than the length of the second connection portion 212 (or the second connection piece 32) in the direction along the first connection portion 211 to the first connection piece 31.

In some embodiments, a second angle is formed between (in the plane of) the first connecting tab 31 and the second connecting tab 32, and the second angle is in the range of 80-120 °, such as 80 °, 90 °, 100 °, 120 °, and the like.

Specifically, the pole pieces in the battery cell 2 include a first pole piece and a 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, which are stacked in sequence, and the polarities of the first pole piece and the second pole piece are opposite, for example, the first pole piece is a positive pole piece, 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 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 adapter so as to realize that the first pole tabs 21 are connected with the first adapter, and specifically can be connected with the second connecting piece 32 of the first adapter.

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 as a first notch), the first notches correspond to each other, the first tab 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 tab in the first notch of the first pole piece is sequentially attached to form a first tab 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.

In general, 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 between the second connection portion 212/the first tab plate of the first tab 21 and the second side plate 12 may be greater than or equal to the distance between the battery cell 2 and the second side plate 12, and the distance between the second connection portion 212/the first tab plate of the first tab 21 and the third side plate 13 may be greater than or equal to the distance between the battery cell 2 and 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 extending 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 extending 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 extending portion 23 and the first side plate 11, which is relatively more favorable for the connection between the first tab/first tab 21 and the second connecting piece 32, so as to increase a contact area between the first tab/first tab and the second connecting piece, and improve stability.

In addition, the projection of the first connecting piece on the second side plate 12 is not overlapped with the projection of the extending 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 are not overlapped with the projection of the extending portion 23 on the second side plate 12 respectively.

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, the axial cross-sectional area of the first outer tab 41 perpendicular to the first pole post 42 may be larger than the axial cross-sectional area of the first pole post 42 perpendicular to the first pole post 42, the axial projection of the first outer tab 41 perpendicular to the first pole post 42 covers the axial projection of the first pole post 42 perpendicular to the first pole post 42, the cross-sectional area of the first extended portion 43 perpendicular to the first pole post 42 is larger than the axial cross-sectional area of the first pole post 42 perpendicular to the first pole post 42, the axial projection of the first extended portion 43 perpendicular to the first pole post 42 covers the axial projection of the first pole post 42, the axial cross-sectional area of the first outer tab 41 perpendicular to the first pole post 42 is larger than the axial cross-sectional area of the first extended portion 43 perpendicular to the first pole post 42, the axial projection of the first outer tab 41 perpendicular to the first pole post 42 covers the axial projection of the first extended portion 43 perpendicular to the first pole post 42, the cross-sectional area of the first extension portion 43 perpendicular to the axial direction of the first pole 42 is substantially equal to the cross-sectional area of the second hole section perpendicular to the axial direction of the first pole 42 (also the axial direction of the first through hole 30), and the first extension portion 43 is clamped in the second hole section and is connected with the side wall of the second hole section.

In some embodiments, an end surface of the first terminal post 42 close to the battery cell 2 is flush with a side surface of the first connection tab 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.

The first tab 21 may be electrically connected to the housing 1, and the first outer tab 41, the first pole 42, and the first connecting tab 31 of the first adapter may be in direct contact with the housing 1, or the second connecting tab 32 of the first adapter 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 connecting member 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 connecting member, and the first pole tab 21 are electrically connected and are connected to the first side plate 11 (the housing 1) in an insulating manner.

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 outwardly protruding (inwardly protruding into the third through hole 110) the side of the second insulating sheet 6 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 penetrating through 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 adaptor. 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 part 61 is located between the first side plate 11 and the first connecting piece, and the first pole 42 penetrates through the first insulating part 61 (i.e., the second through hole 60 is disposed on the third insulating part 61'); the second insulating portion 62 is located between the second side plate 12 and the first adapter, 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 adapter may be supported, and the first adapter may be insulated from the second side plate 12 of the housing 1, thereby improving the safety, stability, and other properties 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 the surface of the first insulating portion 61 contacting the first connecting sheet 31 and the surface of the second insulating portion 62 contacting the second connecting sheet, and the included angle may range from 80 ° to 140 °, such as 80 °, 90 °, 100 °, 110 °, 120 °, 130 °, 140 °, and the like, that is, 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 adaptor 3 'electrically connected to the second lug 22, the second adaptor 3' being located inside the cavity; the second adaptor 3 ' comprises a fourth connecting piece 32 ', and the second tab 22 comprises a fourth connecting portion 222 which is 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 connecting portion 222 of the second tab 22 on the first side plate 11 is in contact with the boundary of the projection of the fourth connecting piece 32' of the first connecting piece on the first side plate 11, but the rest portions except the contact boundary do not overlap with 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 adaptor 3 ', and specifically may be connected to a fourth connection piece 32 ' of the second adaptor 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 adaptor 3 ', and specifically, the fourth connecting portion 222 may be connected to the fourth connecting piece 32 ' of the second adaptor 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 adaptor 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 surface of the pole piece, and the surface of the fourth connection portion 222 may be parallel to the surface of the pole piece.

Furthermore, the second adapter 3 ' comprises a third connection piece 31 ' connected to a fourth connection 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 adaptor 3 ', so as to connect the second tab 22 to the second adaptor 3', and specifically, can be connected to the fourth connection portion 32 'of the second adaptor 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 connection 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 may be substantially equal to the distance from the second tab to the third side plate 13.

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 adaptor 3 ' on the second side plate 12 does not overlap the projection of the extension 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 23 on the second side plate 12.

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., passing 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 piece 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 extending part corresponding to 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, which is connected to the fourth hole section, preferably, the diameter of the fourth hole section is greater than the 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 extension portion perpendicular to the second pole column is 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 extension portion 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 extension portion 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 extension portion perpendicular to the axial direction of the second pole column, the cross-sectional area of the second extension part perpendicular to the axial direction of the second pole is substantially equal to the cross-sectional area of the fourth hole section perpendicular to the axial direction of the second pole (also the axial direction of the fifth through hole 30'), and the second extension part is clamped in the fourth hole section and connected with the side wall of the fourth hole section.

In some embodiments, an end surface of the second pole piece near the battery cell 2 is flush with a side surface of the third connection piece 31' near the battery 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.

The second tab 22 can be electrically connected to the housing 1, and the second outer connecting piece 41 ', the second pole, and the third connecting piece 31' of the second adaptor 3 'can be directly contacted to the housing 1, or, as shown in fig. 4, the fourth connecting piece 32' of the second adaptor is welded to the second side plate 12 (or the third side plate 13) of the housing 1 (the third connecting piece 31 'and the second outer connecting piece 41' and the like 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 adaptor 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 adaptor 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 insulating layer may be integrally formed with the third insulating sheet 5 ', the second insulating layer being formed by the third insulating sheet 5' protruding outward (protruding inward of 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 a sixth through hole 60', and the second pole passes through the sixth through hole 60 'to realize penetration of the fourth insulation sheet 6'. Specifically, the second pole column 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 adaptor 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.

Furthermore, 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 adaptor 3 ', and the second pole column penetrates through the third insulating part 61 ' (i.e., the sixth through hole 60 ' is disposed on the third insulating part 61 '); the fourth insulating portion 62 'is located between the second side plate 12 and the second adaptor 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 adaptor 3 ', and can insulate the second adaptor 3' from the second side plate 12 of the housing 1, thereby improving the safety, stability, and other properties of the battery.

The projection of the third insulating portion 61 'on the first side plate 11 covers the projection of the second adaptor 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 adaptor 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 of the third insulating portion and the fourth insulating portion) may be 80 ° to 140 °, for example, 80 °, 90 °, 100 °, 110 °, 120 °, 130 °, 140 °, etc., that is, the third insulating portion and the fourth insulating portion are not parallel, for example, 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 some embodiments, the barrier panel 9 further comprises a first barrier 91 connected to a second barrier 92, the first barrier 91 being located between the extension 23 and the first side plate 11, the second barrier 92 being located between the first connection portion 211 of the first tab 21 and the first connection tab 31 of the first adaptor.

In addition, the blocking sheet 9 further includes a third blocking portion 93 connected to the first blocking portion 91, and the third blocking portion is located between the third connecting portion 221 of the second pole ear 22 and the third connecting sheet 31 'of the second adaptor 3'.

Specifically, the blocking tab 9 is located between the third connecting tab 31' and the third connecting portion 221, and a projection of the third connecting portion 221 on the first side plate 11 may at least partially overlap with a projection of the blocking tab 9/the third blocking portion 93 on the first side plate 11. The projection of the blocking tab 9 on the first side plate 11 may not cover the projection of the fourth connecting tab 32 'on the first side plate 11, and the fourth connecting tab 32' is located on the side of the fourth connecting portion 222 away from the blocking tab 9/the second groove/the third blocking portion 93, for example.

Specifically, the width of the first blocking portion 91 is greater than or equal to the width of the second blocking portion 92, the width of the first blocking portion 91 is greater than or equal to the width of the third blocking portion 93, and the width of the second blocking portion 92 and the width of the third blocking portion 93 may be equal or different. The width of the first blocking portion 91, the width of the second blocking portion 92, and the width of the third blocking portion 93 are widths in a direction along the third side plate 13 to the second side plate 12.

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 adapter.

Specifically, a projection of the first blocking 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 connector (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 blocking portion 93 is provided with a second groove, and the fourth connecting portion 222 of the second tab 22 extends into the second groove. 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 adaptor 3'.

Specifically, the second blocking 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 towards the second side plate (i.e., between the second connecting portion 212/first pole ear plate and the second side plate 13), the third blocking 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 towards the second side plate (i.e., between the fourth connecting portion 222/second pole ear plate and the second side plate 13).

Specifically, the projection of the third blocking portion 93 in the thickness direction of the battery cell 2 overlaps with the projection of the fourth connecting portion 222 of the second tab 22 and the second adaptor 3 '(the fourth connecting 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 connection 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 blocking 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, and 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 battery cell 2 (a side surface of the battery cell 2) is a side surface where an outer edge of the pole piece in the battery cell 2 is 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 battery cell 2, that is, the side surface of the battery cell 2 is parallel to the thickness direction of the battery cell 2 (also, the thickness direction of the pole piece).

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 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 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 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 is 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 is 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 the invention is not limited thereto, and 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 of the battery cell 2 may be one or more, and when the number of the first protective adhesive layers 71 on any one side is one, the length of the first protective adhesive layers 71 on the side along the length direction of the side may not be greater than the length of the side, for example, 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, substantially equal to the length of the second side; when the number of the first protective adhesive layers 71 on the second side is plural, the plural first protective adhesive layers 71 may 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 and stability of the battery are 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 is better infiltrated into the electrode sheet, and the battery performance is 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 and adhesion, which may be adhesive paper 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), and the first surface (surface) of the electric core 2, the second surface (surface) of the electric core 2 and the surface of the pole piece can be parallel (perpendicular to the thickness direction of the pole piece).

The pole piece located on the first surface of the battery cell 2 and the pole piece located on the second surface of the battery cell 2 are the outermost pole pieces of the battery cell 2, namely, the rest of pole pieces are stacked between the pole piece located on the first surface of the battery cell 2 and the pole piece located on the second surface of the battery cell 2. The polarity of the electrode plate located on the first surface of the battery cell 2 and the polarity of the electrode plate located on the second surface of the battery cell 2 may be the same or different, and may be a positive electrode plate or a negative electrode plate, and may be a first electrode plate or a second electrode plate, and it is generally preferable that the electrode plate located on the first surface of the battery cell 2 and the electrode plate located on the second surface of the battery cell 2 are negative electrode plates.

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 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 connected in sequence, and are respectively located between the second side plate 12 (or referred to as a bottom plate) and the third side plate 13 (or referred to as a 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 parallel to the direction from the third side plate 13 to the second side plate 12 (i.e., the thickness direction of the case 1) are both arcs, respectively, which form grooves that open toward the cavity.

The case 1 may further include a thinned portion 131, and the mechanical strength of the thinned portion 131 is lower 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 can 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 a joint portion (or the first outer joint piece 41) of the first side plate 11 and the second adaptor 3 'and a joint portion (or the second outer joint piece 41') of the first side plate 11 and the first adaptor, and 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 aluminum alloy, and the specific material types of the two may be the same or different (when the two materials are different, for example, the material of the positive tab is aluminum, and the material of the housing 1 is 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 adaptor 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 adaptor 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 adaptor 3 'and the material of the second electrode tab 22 may be the same polarity material, for example, the second electrode tab 22 is a negative electrode tab, the material of the second adaptor 3' and the material of the second electrode tab 22 may be nickel, iron or nickel-iron alloy, 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, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

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 towards one side of first curb plate is equipped with first utmost point ear, the battery cell with be equipped with the separation piece between the first curb plate, first utmost point ear include to the second connecting portion that first curb plate extends, the separation piece includes second separation portion, second separation portion is equipped with first recess, the second connecting portion of first utmost point ear extend to in the first recess.

2. The battery of claim 1, wherein the first tab further comprises a first connection portion coupled to the second connection portion, the first connection portion being coupled to the cell, the first connection portion being located between the cell and the barrier sheet.

3. The battery of claim 2, wherein a projection of the first connection portion on the first side plate at least partially overlaps a projection of the barrier tab on the first side plate.

4. The battery of claim 2, wherein a surface of the first connection portion and a surface of the second connection portion form a first included angle therebetween, the first included angle being in a range of 80-120 °.

5. The battery of claim 1, wherein a projection of the second barrier portion in the thickness direction of the cell overlaps with a projection of the second connecting portion of the first tab in the thickness direction of the cell; and/or the presence of a gas in the atmosphere,

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 gas,

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 gas,

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.

6. The battery of claim 1, further comprising a first adapter electrically connected to the first tab, the first adapter being located within the cavity, the first adapter comprising a first connection tab, the first tab comprising a first connection portion connected to the second connection portion, the first connection portion being connected to the electrical core, the first connection tab being located between the first side plate and the first connection portion, and the barrier tab being located between the first connection tab and the first connection portion.

7. The cell defined in any one of claims 1-6, further comprising a first adapter in electrical communication with the first tab, the first adapter being located within the cavity, the first adapter further comprising a second tab connected to the second connection portion, a projection of the barrier tab on the first side plate not overlapping a projection of the second tab on the first side plate.

8. The battery of any one of claims 1-6, further comprising a first adapter located in the cavity, 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 located 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 adapter.

9. The battery of claim 8, wherein the housing includes 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 pole ear is attached towards the direction close to the third side plate to form the first pole ear 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.

10. The battery according to any one of claims 1 to 6,

the battery further comprises a first adapter electrically connected to the first tab, the first adapter being located within the cavity, the first adapter comprising a first connection tab;

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.

11. The battery of claim 10, 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 of the first pole column, which is close to the battery core, extends outwards to form a first extending portion which corresponds to the second hole section.

12. The battery of claim 10, 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.

13. The battery of claim 10, wherein one end of the first terminal column close to the battery cell extends out of the first through hole and is formed with a first outer extension portion extending outwards along the circumferential direction of the first through hole and connected with one side surface of the first connecting piece close to the battery cell.

14. The battery according to claim 10,

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 switching 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 and the first side plate.

15. The battery according to claim 14,

the projection of the first insulating sheet on the first side plate covers the projection of the first outer connecting sheet on the first side plate; and/or the presence of a gas in the gas,

the first insulating layer is formed by the outward protrusion of one side of the first insulating sheet close to the first side plate, or formed by the outward protrusion of one side of the second insulating sheet close to the first side plate.

16. The battery according to claim 14 or 15,

the battery also comprises a second side plate connected with the first side plate, and the second insulation plate comprises a first insulation part and a second insulation part; the first insulation part is positioned between the first side plate and the first adapter, and the first pole penetrates through the first insulation part; the second insulating part is located between the second side plate and the first adapter.

17. The battery of claim 16,

the projection of the second insulating part on the second side plate covers the projection of the first adapter 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 adapter on the first side plate; and/or the presence of a gas in the gas,

the included angle between the first insulating part and the second insulating part ranges from 80 degrees to 120 degrees.

18. 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.

19. The battery of claim 18,

the projection of the first lug on the first side plate is not overlapped with the projection of the second lug on the first side plate.

20. The battery of claim 18 or 19, wherein the barrier sheet comprises a third barrier portion, the third barrier portion is provided with a second groove, the second tab comprises a fourth connecting portion extending toward the first side plate, and the fourth connecting portion of the second tab extends into the second groove.

21. The battery of claim 1, wherein the cell has a width a, and the barrier sheet has a length b in the width direction of the cell, and 0 ≦ a-b ≦ 3.

22. 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.