CN216750234U

CN216750234U - Battery with a battery cell

Info

Publication number: CN216750234U
Application number: CN202220209583.9U
Authority: CN
Inventors: 卫志达; 徐延铭; 谢斌; 彭宁
Original assignee: Zhuhai Cosmx Battery Co Ltd
Current assignee: Zhuhai Cosmx Battery Co Ltd
Priority date: 2022-01-25
Filing date: 2022-01-25
Publication date: 2022-06-14
Anticipated expiration: 2032-01-25

Abstract

The embodiment of the application belongs to the technical field of batteries, and particularly relates to a battery. The embodiment of the application aims at solving the problem that the connecting piece attached to the battery core in the related art occupies the space of the shell, so that the volume of the shell is large, and the energy density of the battery is low. In the battery of the embodiment of the application, the battery cell and the at least one connecting piece are both packaged in the outer packaging shell, and the battery cell comprises a body part, and a first output part and a second output part which are arranged on the body part; the battery cell further comprises at least one notch part, and the connecting piece is accommodated in the notch part; the first output portion is electrically connected to the connecting member. The breach portion that the electricity core outer wall set up provides the accommodation space for the connecting piece, avoids the connecting piece to occupy the space of outer packing shell to reduce outer packing shell volume, promote battery energy density.

Description

Battery with a battery cell

Technical Field

The embodiment of the application relates to the technical field of batteries, in particular to a battery.

Background

Batteries, such as lithium ion batteries, have been widely used as power supply devices. In the correlation technique, the battery includes rigid housing, electric core and connecting piece, and electric core and connecting piece encapsulation are inside rigid housing, and electric core is including the positive plate, diaphragm and the negative plate of range upon range of setting, and the connecting piece includes attached first connecting piece and the second connecting piece on the parallel layer outer wall with the positive plate in electric core, and first connecting piece is connected with the positive plate electricity, and the second connecting piece is connected with the negative plate electricity, and first connecting piece and second connecting piece are used for supplying power to the external world.

However, in the related art, the first connecting member and the second connecting member attached to the outer wall of the battery cell occupy a space of the rigid casing, so that the volume of the rigid casing is large, resulting in a low energy density of the battery.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a battery for solve attached first connecting piece and the space that occupies the rigid housing on electric core outer wall of electricity, make the rigid housing volume great, lead to the lower problem of energy density of battery.

In one aspect, an embodiment of the present application provides a battery, including: the battery comprises an outer packaging shell, a battery core and at least one connecting piece, wherein the battery core and the at least one connecting piece are packaged in the outer packaging shell; the battery cell comprises a body part, a first output part and a second output part, wherein the first output part and the second output part are arranged on the body part; the battery cell further comprises at least one notch part, and the connecting piece is accommodated in the notch part; the first output portion is electrically connected to the connecting member.

In some embodiments, which may include the above embodiments, the battery includes a first connector and a second connector, the cell includes a first cutout portion and a second cutout portion; the first connecting piece is accommodated in the first gap part, and the second connecting piece is accommodated in the second gap part; the first output part is electrically connected with the first connecting piece; the second output part is electrically connected with the second connecting piece.

In some embodiments, which may include the above embodiments, the first connection piece and the second connection piece are located on the same side in a length direction of the battery cell.

In some embodiments, which may include the above embodiments, the outer packaging casing includes a bottom plate and a casing covering the bottom plate, and the battery cell and the connector are located between the bottom plate and the casing; the connecting piece deviates from one side setting of breach portion is in on the bottom plate, the connecting piece deviates from one side of breach portion is including running through the bulge of bottom plate.

In some embodiments, which may include the above embodiments, an insulating glue layer is disposed between the connecting member and the bottom plate, and a projection of the connecting member on the bottom plate is located within a projection of the insulating glue layer on the bottom plate.

In some embodiments, which may include the above embodiments, a projection of a single edge of the insulating glue layer on the bottom plate is a first projection, a projection of a corresponding boundary of the connecting member on the bottom plate is a second projection, and a distance between the first projection and the second projection is greater than 1.5 mm.

In some embodiments, which may include the above embodiments, the bottom plate is provided with a mounting hole, and the protruding portion is inserted into the mounting hole; and an insulating glue layer is arranged between the convex part and the hole wall of the mounting hole.

In some embodiments, which may include the above embodiments, the battery includes a first connector and a second connector; the first connecting piece comprises a first body part and a first connecting part, the first connecting part is connected with the first output part, a first protruding part is arranged on the surface of the first body part, which is far away from the first connecting part, and the first protruding part penetrates through the bottom plate; the second connecting piece comprises a second body part and a second connecting part, the second connecting part is connected with the second output part, a second protruding part is arranged on the surface, deviating from the second connecting part, of the second body part, and the second protruding part penetrates through the bottom plate.

In some embodiments, which may include the above-described embodiments, the battery further includes a first insulation sheet disposed between the first connection portion and the body portion of the cell, and a second insulation sheet disposed between the second connection portion and the body portion of the cell.

In some embodiments, which may include the above embodiments, the battery further includes a third insulation sheet disposed between the exterior packaging case and the first output part.

In some embodiments, which may include the above embodiments, the battery cell includes a plurality of first pole pieces, a plurality of first pole tabs extending along a length direction of the first pole pieces, a plurality of second pole pieces, and a plurality of second pole tabs extending along a length direction of the second pole pieces, the first pole pieces and the second pole pieces are stacked, and notches are provided at corresponding positions of a plurality of first pole pieces and second pole pieces close to the bottom plate to form the notch portion; the first output part is a plurality of first tabs; the second output portion is a plurality of the second tabs.

In some embodiments, which may include the above embodiments, the battery includes a first connector and a second connector; the first connecting piece comprises a first body part and a first connecting part; the second connector comprises a second body part and a second connecting part; the first tabs comprise bent parts bent towards the battery cell, the bent parts of all the first tabs are stacked to form the first output part, and the first output part is connected with the side face, away from the first connecting part, of the first body part; the plurality of second tabs comprise bent parts bent towards the battery cell, the bent parts of all the second tabs are stacked to form the second output part, and the second output part is connected with the side face, away from the second connecting part, of the second body part.

In some embodiments, which may include the above embodiments, in a thickness direction of the first pole piece or the second pole piece, a thickness of the notch portion is a thickness of at least one of the first pole piece or the second pole piece.

In some embodiments, which may include the above embodiments, the edge of the housing facing the base plate has an arc-shaped folded edge, and the arc-shaped folded edge is welded with the base plate in an attaching manner.

In some embodiments, which may include the above embodiments, the housing is enclosed by a cover plate, at least three risers perpendicular to the cover plate; a first fillet structure is arranged at the junction of two adjacent vertical plates, and the radius of the first fillet structure is 1.0mm-5.0 mm; and/or a second fillet structure is arranged at the junction of the vertical plate and the cover plate, and the radius of the second fillet structure is 0.1-0.5 mm.

The embodiment of the application provides a battery, through the outer wall at the this somatic part of electricity core set up at least one breach portion, the connecting piece holding is in breach portion, and breach portion provides the accommodation space for the connecting piece, avoids the connecting piece to occupy the usage space of outer packaging shell to reduce the volume of outer packaging shell, promote battery energy density.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.

FIG. 1 is a schematic structural diagram of an outer package casing of a battery provided in an embodiment of the present application;

fig. 2 is a schematic structural diagram of a battery cell of a battery provided in an embodiment of the present application;

fig. 3 is a first schematic structural diagram of a connection member of a battery according to an embodiment of the present disclosure;

fig. 4 is a second schematic structural diagram of a second connection member of a battery according to an embodiment of the present disclosure;

fig. 5 is a schematic structural diagram of a first pole piece and a second pole piece of a battery provided in an embodiment of the present application;

fig. 6 is a first schematic structural diagram of a battery cell and a base plate of a battery provided in an embodiment of the present application;

fig. 7 is a second schematic structural diagram of a battery cell and a base plate of a battery provided in the embodiment of the present application;

fig. 8 is a third schematic structural diagram of a battery cell and a base plate of a battery provided in the embodiment of the present application.

Description of reference numerals:

10: an outer packaging shell;

101: a base plate; 102: a housing; 103: a first mounting hole; 104: a second mounting hole; 105: folding edges in an arc shape; 106: a first fillet structure; 107: a pressure relief groove;

20: an electric core;

201: a first pole piece; 202: a second pole piece; 203: a diaphragm; 204: a first notch portion; 205: a second notch portion; 206: presetting a side surface; 207: a first preset end face; 208: a second preset end face;

2011: a first output section; 2012: a first tab; 2021: a second output section; 2022: a second tab;

30: a connecting member;

301: a first connecting member; 302: a second connecting member; 303: a first projecting portion; 304: a second projection;

3011: a first body portion; 3012: a first connection portion; 3021: a second body portion; 3022: a second connecting portion;

402: a second insulating sheet; 403: and a third insulating sheet.

With the above figures, there are shown specific embodiments of the present application, which will be described in more detail below. These drawings and written description are not intended to limit the scope of the inventive concepts in any manner, but rather to illustrate the inventive concepts to those skilled in the art by reference to specific embodiments.

Detailed Description

The energy density of the battery refers to the electric energy released by the average unit volume or mass of the battery, and comprises a weight energy density and a volume energy density, wherein the weight energy density is the battery capacity multiplied by the discharge plateau/weight, and the volume energy density is the battery capacity multiplied by the discharge plateau/volume; the higher the energy density of the battery, the more electricity stored per unit volume, or weight; conversely, for a battery with the same storage capacity, the larger the volume, the less electric energy is released per unit volume, and the lower the energy density of the battery.

The battery of the prior art comprises a battery cell, two connecting pieces and a rigid shell, wherein the battery cell and the two connecting pieces are all packaged inside the rigid shell, the battery cell comprises a positive plate, a diaphragm and a negative plate which are stacked, the positive plate outwards extends out of a positive tab, the negative plate outwards extends out of a negative tab, the two connecting pieces are all attached to the outer wall of the battery cell, one connecting piece is electrically connected with the positive tab, the other connecting piece is electrically connected with the negative tab, and meanwhile the two connecting pieces are also used for supplying power to the outside. However, the two connecting pieces attached to the outer wall of the battery core increase the thickness of the battery core and occupy the use space of the rigid shell, so that the rigid shell of the battery has larger volume and lower energy density.

To above-mentioned technical problem, this application embodiment provides a battery, sets up at least one breach portion on the outer wall of electric core, with the connecting piece holding in breach portion, avoids the connecting piece to occupy the usage space of rigid housing, reduces the volume of rigid housing, promotes battery energy density.

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Referring to fig. 1 to fig. 3, a battery provided in an embodiment of the present application includes: the battery pack comprises an outer packaging shell 10, a battery cell 20 and at least one connecting piece 30, wherein the battery cell 20 and the connecting piece 30 are packaged in the outer packaging shell 10.

In an embodiment of the application, including one connecting element 30, the battery cell 20 includes a body portion, the body portion includes a first output portion 2011 and a second output portion 2021 (the first output portion 2011 may be a positive tab, and the second output portion 2021 may be a negative tab), the first output portion 2011 is electrically connected to the connecting element 30, and the connecting element 30 is further configured to be connected to an external device, the second output portion 2021 is electrically connected to the outer package casing 10, and the outer package casing 10 is configured to be connected to the external device, so that the battery can supply power to the external device.

In this embodiment, the outer wall of the body portion of the battery cell 20 is provided with a notch portion, and the notch portion is recessed toward the body portion of the battery cell 20, that is, on the body portion of the battery cell 20, the thickness of the area having the notch portion is smaller than that of other areas; when the connector 30 is accommodated in the notch portion, the thickness of the region having the notch portion is still smaller than that of the other region, or the thickness of the region having the notch portion is equal to that of the other region.

In another embodiment of the present application, two connectors 30 are included: the battery cell 20 comprises a body part, the body part comprises a first output part 2011 and a second output part 2021 (the first output part 2011 can be a positive tab, and the second output part 2021 can be a negative tab), the first output part 2011 is electrically connected with the first connecting part 301, the second output part 2021 is electrically connected with the second connecting part 302, and the first connecting part 301 and the second connecting part 302 are further used for being connected with external equipment, so that the battery can supply power to the external equipment.

In this embodiment, two notch portions are provided on the outer wall of the body portion of the battery cell 20: the first notch portion 204 and the second notch portion 205, and the first notch portion 204 and the second notch portion 205 are each recessed toward the body portion of the battery cell 20, that is, on the body portion of the battery cell 20, the thickness of the region having the first notch portion 204 and the second notch portion 205 is smaller than the thickness of the other regions. The first connector 301 is accommodated in the first notch portion 204, and the second connector 302 is accommodated in the second notch portion 205, and at this time, the thickness of the region having the first notch portion 204 and the second notch portion 205 is still smaller than that of the other region, or the thickness of the region having the first notch portion 204 and the second notch portion 205 is equal to that of the other region.

Therefore, in the battery of the embodiment of the present application, the battery cell 20 and the at least one connecting member 30 are all packaged in the external packaging case 10, the outer wall of the main body portion of the battery cell 20 is provided with at least one notch portion, the connecting member 30 is accommodated in the notch portion, the connecting member 30 is electrically connected to the first output portion 2011 on the main body portion, and meanwhile, the connecting member 30 is further used for being connected to an external device, so that the battery can supply power to the external device. The gap part provides an accommodating space for the connecting piece 30, and avoids the connecting piece 30 from occupying the use space of the external packaging shell 10, thereby reducing the volume of the external packaging shell 10 and improving the energy density of the battery.

The following description of the present application refers to two connectors 30: embodiments of the first connector 301 and the second connector 302 are explained in detail.

In the embodiment of the present application, the first connection member 301 and the second connection member 302 are located on the same side in the length direction of the battery cell 20. The body portion of the battery cell 20 may include a winding structure or a lamination structure, the battery cell 20 of the winding structure may be a cylindrical winding core, and the battery cell 20 of the lamination structure may be a plate-shaped lamination core. When the body portion of the battery cell 20 is a winding core, the body portion of the battery cell 20 may include an arc-shaped side surface, a first bottom surface and a second bottom surface, the first bottom surface and the second bottom surface are arranged oppositely, a first notch portion 204 and a second notch portion 205 are arranged on the arc-shaped side surface at a position close to the first bottom surface, a first output portion 2011 and a second output portion 2021 extend outwards from the first bottom surface, and the first connecting member 301 is accommodated in the first notch portion 204 and connected to the first output portion 2011; the second connector 302 is accommodated in the second notch 205 and connected to the second output portion 2021. At this time, there is no excessive gap between the second bottom surface and the outer package 10, and the space occupied by the body portion of the battery cell 20 is further reduced.

Referring to fig. 2 and fig. 5, in the embodiment of the application, when the body portion of the battery cell 20 is a stacked core, the body portion of the battery cell 20 may include a first pole piece 201, a diaphragm 203, and a second pole piece 202, which are stacked, where the first pole piece 201 and the second pole piece 202 are arranged in parallel, and the diaphragm 203 is located between the first pole piece 201 and the second pole piece 202. The body portion of the battery cell 20 has two preset side surfaces 206 (only one of which is shown in fig. 2) arranged oppositely, and the two preset side surfaces 206 are parallel to the first pole piece 201; the body portion of the battery cell 20 further has four preset end faces, specifically including: two first preset end surfaces 207 (only one of which is shown in fig. 2) which are arranged oppositely, and two second preset end surfaces 208 (only one of which is shown in fig. 2) which are arranged oppositely, the first preset end surfaces 207 and the second preset end surfaces 208 are adjacent, and the first preset end surfaces 207 and the second preset end surfaces 208 are both perpendicular to the preset side surfaces 206.

The first notch portion 204 and the second notch portion 205 are both arranged on the preset side face 206 at a position close to one preset end face 207, the first pole piece 201 and the second pole piece 202 respectively extend outwards from the preset end face 207 to form a first output portion 2011 and a second output portion 2021, and the first connecting piece 301 is accommodated in the first notch portion 204 and connected with the first output portion 2011; the second connector 302 is accommodated in the second notch 205 and connected to the second output portion 2021. At this time, there is no extra gap between the other preset end face 207 and the outer package 10, and the space occupied by the body portion of the battery cell 20 is further reduced.

In the above embodiment, the first notch portion 204 and the second notch portion 205 both penetrate the first predetermined end surface 207, the first connecting member 301 is accommodated in the first notch portion 204, and an end portion of the first connecting member 301 extends from a position where the first notch portion 204 penetrates the first predetermined end surface 207 and is connected to the first output portion 2011; the second connector 302 is accommodated in the second notch 205, and an end of the second connector 302 extends from a position where the second notch 205 penetrates the first predetermined end surface 207, and is connected to the second output portion 2021. The preset side surface 206 and the preset end surface 207 adjacent to each other are penetrated through the first notch portion 204 and the second notch portion 205, so that the first connector 301 and the second connector 302 can be as close to the first output portion 2011 and the second output portion 2021 as possible, and the reliability of connection is ensured.

The first notch portion 204 and the second notch portion 205 may also penetrate through the first preset end surface 207 and the second preset end surface 208, so that the connection reliability is ensured, the preparation difficulty of the battery cell 20 can be reduced, and the installation difficulty of the first connecting piece 301 and the second connecting piece 302 can be reduced.

Referring to fig. 1 and fig. 8, in the embodiment of the present application, the external packaging shell 10 includes a base plate 101 and a shell 102 covering the base plate 101, and the battery cell 20 and the connector 30 are located between the base plate 101 and the shell 102; the housing 102 includes an accommodating chamber with an opening, and after the housing 102 is covered on the bottom plate 101, a sealed accommodating chamber is formed between the bottom plate 101 and the housing 102, and the battery cell 20 and the connecting member 30 are both disposed in the accommodating chamber.

One side of the connecting piece 30 departing from the notch portion is arranged on the bottom plate 101, and one side of the connecting piece 30 departing from the notch portion comprises a protruding portion penetrating through the bottom plate 101; for the present application there are two connectors 30: in the embodiments of the first connector 301 and the second connector 302, a side of the first connector 301 facing away from the first notch portion 204 is disposed on the bottom plate 101, and a side of the first connector 301 facing away from the first notch portion 204 includes a first protrusion 303 penetrating through the bottom plate 101; a side of the second connector 302 facing away from the second notch 205 is disposed on the bottom plate 101, and a side of the second connector 302 facing away from the second notch 205 includes a second protrusion 304 penetrating through the bottom plate 101. The first protrusion 303 and the second protrusion 304 are used to electrically connect with an external device, so that the first connector 301 and the second connector 302 can supply power to the external device.

In the embodiment of the present application, the bottom plate 101 is provided with a mounting hole, and the protruding portion is disposed in the mounting hole in a penetrating manner. Referring to fig. 3, 4 and 8, for the present application there are two connectors 30: in the embodiment of the first connector 301 and the second connector 302, the bottom plate 101 is provided with a first mounting hole 103 and a second mounting hole 104 at intervals, the first protrusion 303 is inserted into the first mounting hole 103, and the second protrusion 304 is inserted into the second mounting hole 104. Wherein, first breach portion 204 and second breach portion 205 all set up on electric core 20 towards the outer wall of bottom plate 101, and when electric core 20 set up in holding the cavity, first breach portion 204 corresponds first mounting hole 103, and second breach portion 205 corresponds second mounting hole 104, and first bulge 303 wears to establish in first mounting hole 103 and the salient outside of extranal packaging shell 10, and second bulge 304 wears to establish and is protruding outside of extranal packaging shell 10 in second mounting hole 104.

Meanwhile, an insulating glue layer is arranged between the connecting piece 30 and the bottom plate 101, and an insulating glue layer is arranged between the convex part and the hole wall of the mounting hole; that is, the battery may further include a first insulating adhesive layer disposed between the first connection member 301 and the base plate 101, a second insulating adhesive layer disposed between the second connection member 302 and the base plate 101, a third insulating adhesive layer disposed between the hole wall of the first mounting hole 103 and the first protrusion 303, and a fourth insulating adhesive layer disposed between the hole wall of the second mounting hole 104 and the second protrusion 304; when the side that first connecting piece 301 deviates from first breach portion 204 sets up on bottom plate 101, first insulating glue film is used for bonding first connecting piece 301 and bottom plate 101 in, avoids first connecting piece 301 and bottom plate 101 to influence each other, and first bulge 303 wears to establish in first mounting hole 103 this moment, and when third insulating glue film can seal up outer packaging shell 10, prevents to contact each other between first bulge 303 and the outer packaging shell 10. When the second connector 302 deviates from the side of the second notch portion 205 and is disposed on the bottom plate 101, the second insulating adhesive layer is used for bonding the second connector 302 and the bottom plate 101, and at the same time, the second connector 302 and the bottom plate 101 are prevented from being affected with each other, the second protruding portion 304 is arranged in the second mounting hole 104 in a penetrating manner, and the fourth insulating adhesive layer can prevent the second protruding portion 304 and the outer packaging shell 10 from contacting with each other while the outer packaging shell 10 is sealed.

In the above embodiment, the projection of the connecting member 30 on the bottom plate 101 is located in the projection of the insulating glue layer on the bottom plate 101, where the projection of one side of the insulating glue layer on the bottom plate 101 is the first projection, and the projection of the corresponding boundary of the connecting member 30 on the bottom plate 101 is the second projection, that is, the second projection is located in the first projection; and the distance between the first projection and the second projection is greater than 1.5 millimeters, when the connecting piece 30 is bonded on the bottom plate 101, a part of the insulating glue layer overflows, and the insulating effect is ensured.

For the present application there are two connectors 30: in the embodiments of the first connecting member 301 and the second connecting member 302, the projections of the single edge of the first insulating adhesive layer and the single edge of the second insulating adhesive layer on the bottom plate 101 are both first projections, the projections of the corresponding boundaries of the first connecting member 301 and the second connecting member 302 on the bottom plate 101 are both second projections, and the distance between the first projection and the second projection is greater than 1.5 mm. That is to say, the areas of the first insulating adhesive layer and the second insulating adhesive layer are larger than the areas of the first connecting piece 301 and the second connecting piece 302, and when the first connecting piece 301 and the second connecting piece 302 are bonded on the bottom plate 101, the first insulating adhesive layer and the second insulating adhesive layer overflow a part, so that the insulating effect is ensured.

In the embodiment of the present application, the first connecting element 301 is accommodated in the first notch portion 204, and after the end of the first connecting element 301 extends out from the position where the first notch portion 204 is communicated with the first preset end surface 207, the end of the first connecting element 301 may be bent towards the preset end surface 207, so that the end of the bent first connecting element 301 is connected to the first tab; similarly, the second connector 302 is accommodated in the second notch 205, and after the end of the second connector 302 extends out from the position where the second notch 205 and the first predetermined end surface 207 are communicated, the end of the second connector 302 can be bent towards the predetermined end surface 207, so that the bent end of the second connector 302 is connected with the second tab, thereby further increasing the connection strength between the connector and the tab.

Referring to fig. 3 and fig. 4, for the above embodiment, the first connecting piece 301 may include a first body portion 3011 and a first connecting portion 3012, the first connecting portion 3012 is connected to the first output portion 2011, a surface of the first body portion 3011 facing away from the first connecting portion 3012 is provided with a first protruding portion 303 (not shown in fig. 3 and fig. 4), and the first protruding portion 303 penetrates through the bottom plate 101; the second connector 302 includes a second body portion 3021 and a second connection portion 3022, the second connection portion 3022 is connected to the second output portion 2021, a surface of the second body portion 3021 facing away from the second connection portion 3012 is provided with a second protruding portion 304, and the second protruding portion 304 penetrates through the bottom plate 101.

The first body portion 3011 and the second body portion 3021 are both parallel to the first pole piece 201, and the first connection portion 3012 and the second connection portion 3022 are both perpendicular to the first pole piece 201. When the first body 3011 and the second body 3021 are accommodated in the first notch portion 204 and the second notch portion 205, the first connection portion 3012 and the second connection portion 3022 are disposed close to the preset end surface 207, so that the first connection portion 3012 is connected to the first output portion 2011, and the second connection portion 3022 is connected to the second output portion 2021. That is, one end of the first body portion 3011 facing the preset end surface 207 extends out from a position where the first notch portion 204 and the first preset end surface 207 penetrate, so as to be connected to the first connection portion 3012; similarly, the second body 3021 extends from a position where the second notch 205 and the first default end surface 207 penetrate toward one end of the default end surface 207, and is connected to the second connection portion 3022.

In the embodiment of the present application, an end of the first body portion 3011 facing the preset end face 207 is welded to the first connection portion 3012, and an end of the second body portion 3021 facing the preset end face 207 is welded to the second connection portion 3022. The first body portion 3011 and the first connection portion 3012 may be an integral structure, and the second body portion 3021 and the second connection portion 3022 may be an integral structure, which can reduce the manufacturing process and increase the connection strength.

Referring to fig. 2 and 7, in the embodiment of the present application, the first notch portion 204 and the second notch portion 205 are both disposed at the edge of the preset side 206, and a preset distance is formed between the first notch portion 204 and the second notch portion 205; at this time, a preset distance is provided between the first body portion 3011 and the second body portion 3021, and between the first connection portion 3012 and the second connection portion 3022, so that a reasonable electrical gap is ensured between the components, and mutual influence is avoided.

With reference to fig. 3 and fig. 4, the first body 3011, the first connection 3012, the second body 3021, and the second connection 3022 may be plate-shaped, and the plate-shaped structure can match with the shape of the first pole piece 201 (or the second pole piece 202), so as to improve the connection reliability of the overall structure of the battery; and the plate-shaped structure is thinner than other shapes, so that the occupied space is further reduced.

With the above embodiment, the width of the second connecting portion 3022 (the width in the Y direction in fig. 3 and 4) may be larger than the width of the second body portion 3021 (the width in the Y direction in fig. 3 and 4), and likewise, the width of the first connecting portion 3012 (the width in the Y direction in fig. 3) may be larger than the width of the first body portion 3011 (the width in the Y direction in fig. 3); when the first notch portion 204 and the second notch portion 205 are both disposed at the edge of the preset side surface 206, and the first output portion 2011 and the second output portion 2021 are both disposed at the middle of the preset end surface 207, it is possible to ensure reasonable electrical gaps between the components, and to ensure connection between the first connection portion 3012 and the first output portion 2011, and connection between the second connection portion 3022 and the second output portion 2021.

In the embodiment of the present application, the battery may further include a first insulating sheet disposed between the first connection portion 3012 and the body portion of the cell 20, and a second insulating sheet 402 disposed between the second connection portion 3022 and the body portion of the cell 20. Referring to fig. 5, a first insulating sheet (not shown in fig. 5) is attached to a side surface of the first connection portion 3012 close to the preset end surface 207, and a second insulating sheet 402 is attached to a side surface of the second connection portion 3022 close to the preset end surface 207, so as to prevent the first connection portion 3012 from contacting the first pole piece 201 or the second pole piece 202 and the second connection portion 3022 from contacting the first pole piece 201 or the second pole piece 202 when the battery cell 20 is used for a long time and swells, which may affect the normal operation of the battery cell 20.

Referring to fig. 6, the battery provided in the embodiment of the present application may further include a third insulating sheet 403, where the third insulating sheet 403 is disposed between the external packaging case 10 and the first output portion 2011; the third insulating sheet 403 is attached to an inner wall of the outer package shell 10 near the predetermined end face 207, and the third insulating sheet 403 is used for insulating the first connecting portion 3012 from the outer package shell 10.

Alternatively, the third insulation sheet 403 is disposed between the outer package case 10 and the first output portion 2011, between the outer package case 10 and the second output portion 2021, between the outer package case 10 and the first connection portion 3012, and between the outer package case 10 and the second connection portion 3022; that is, the third insulating sheet 403 is attached to the entire inner wall of the external packaging shell 10 facing the predetermined end surface 207, so as to prevent the first connecting portion 3012, the second connecting portion 3022, the first output portion 2011 and the second output portion 2021 from contacting the inner wall of the external packaging shell 10, which may affect the normal operation of the battery.

The first, second, and third insulating sheets 402 and 403 may be sealing insulating paste.

Referring to fig. 4, in the embodiment of the application, the battery cell 20 may include a plurality of first pole pieces 201 and a plurality of second pole pieces 202, where the plurality of first pole pieces 201 and the plurality of second pole pieces 202 are alternately stacked; corresponding positions of the first and

second pole pieces

201 and 202 close to the base plate 101 are provided with notches to form notch portions, wherein the notch portions may be formed by removing at least one first pole piece 201 at the corresponding position or at least one second pole piece 202 at the corresponding position, and include a first notch portion 204 and a second notch portion 205. That is, in the thickness direction of the first pole piece 201 or the second pole piece 202, the thickness of the notch portion is the thickness of at least one first pole piece 201 or the thickness of at least one second pole piece 202.

Each first pole piece 201 extends along the length direction to form a first pole lug 2012, and each second pole piece 202 extends along the length direction to form a second pole lug 2022; and along the direction far away from the preset end surface 207, the first tabs 2012 are sequentially stacked on the side surface of the first connecting member 301 close to the preset end surface 207 to form a first output portion 2011, and the second tabs 2022 are sequentially stacked on the side surface of the second connecting member 302 close to the preset end surface 207 to form a second output portion 2021.

For the above embodiment, the battery may further include a first tab connector and a second tab connector, where the first tab connector is perpendicular to the first pole piece 201 and is disposed near the preset end surface 207, and the first tab connector is connected to each first tab 2012; the second tab connector is perpendicular to the second tab 202, is disposed near the predetermined end surface 207, and is connected to each second tab 2022; that is, the first tab connector connects each of the first tabs 2012 integrally to obtain the first output part 2011, and the second tab connector connects each of the second tabs 2022 integrally to obtain the second output part 2021; at this time, the first connection portion 3012 is attached to the first tab connection member, and the second connection portion 3022 is attached to the second tab connection member, so that the first output portion 2011 is connected to the first connection portion 3012, and the second output portion 2021 is connected to the second connection portion 3022.

In the above embodiment, since the first tab connector has a gap with the preset end surface 207 and the second tab connector also has a gap with the preset end surface 207, the first connection portion 3012 is disposed between the first tab connector and the preset end surface 207, and the second connection portion 3022 is disposed between the second tab connector and the preset end surface 207; specifically, the first connection portion 3012 is attached to a side surface, close to the preset end surface 207, of the first tab connection piece, and the second connection portion 3022 is attached to a side surface, close to the preset end surface 207, of the second tab connection piece, so that the first connection portion 3012 and the second connection portion 3022 are prevented from occupying extra space.

Referring to fig. 5, in the embodiment of the application, each of the plurality of first tabs 2012 includes a bent portion bent toward the battery cell 20, the bent portions of all the first tabs 2012 are stacked to form a first output portion 2011, and the first output portion 2011 is connected to a side surface of the first body portion 3011 away from the first connecting portion 3012; each of the plurality of second pole ears 2022 includes a bent portion bent toward the battery cell 20, the bent portions of all the second pole ears 2022 are stacked to form a second output portion 2021, and the second output portion 2021 is connected to a side surface of the second body portion 3021 away from the second connection portion 3022. That is to say, without additionally adding a first tab connecting piece and a second tab connecting piece, the first tabs 2012 stacked in layers are bent to obtain bent portions, and the plurality of bent portions are stacked and bonded to each other to obtain a first output portion 2011; similarly, the second pole tab 2022 stacked in layers is bent to form a bent portion, and the second output portion 2021 is obtained by stacking and bonding the plurality of bent portions together, thereby further reducing the space occupied by the battery cell 20. The bent part of the first tab 2012 is perpendicular to the first pole piece 201; the bent portion of the second pole tab 2022 is perpendicular to the second pole piece 202.

In the embodiment of the present application, the edge of the housing 102 facing the bottom plate 101 has an arc-shaped folded edge 105, and the arc-shaped folded edge 105 is welded to the bottom plate 101. The arc-shaped folding edge 105 has a protrusion facing away from the casing 102, when the battery cell 20 expands due to long-term use, the casing 102 and the bottom plate 101 are pushed in the direction of the accommodating chamber facing the outside, because the casing 102 and the bottom plate 101 both belong to rigid casings, when the casing 102 and the bottom plate 101 are pushed, the connection between the casing 102 and the bottom plate 101 is prone to tearing off, the arc-shaped folding edge 105 can buffer the pushing force applied to the casing 102 and the bottom plate 101, and the connection between the casing 102 and the bottom plate 101 is prevented from tearing off after the battery cell 20 is used for a long time. And the arcuate hem 105 has a greater span and greater extensibility than a right angle hem.

In the above embodiment, the radius of arc-shaped flap 105 may be 0.1mm to 0.5mm, in which range the extensibility is optimal when the radius of arc-shaped flap 105 is 0.3 mm.

Referring to fig. 1, in the embodiment of the present application, the casing 102 is formed by a cover plate and at least three vertical plates perpendicular to the cover plate, a first fillet structure 106 is disposed at a junction of two adjacent vertical plates, and/or a second fillet structure (not shown in fig. 1) is disposed at a junction of a vertical plate and the cover plate, and the first fillet structure 106 and the second fillet structure can increase strength of the casing 102. Wherein the radius of the first fillet structure 106 may be 1.0mm to 5.0mm, in which range the optimal radius of the first fillet structure 106 is 3 mm; the radius of the second fillet structure may be 0.1mm to 0.5mm, in which range the optimum radius of the second fillet structure is 0.3 mm. The housing 102 may be a rectangular housing, which is surrounded by a cover plate and four vertical plates, and the four vertical plates are perpendicular to the cover plate; the bottom plate 101 is formed into a rectangular plate, and the bottom plate 101 is parallel to the cover plate; the position department of two liang of junctures of four risers is provided with first fillet structure 106, and the juncture of four limits of apron and each riser all is provided with second fillet structure.

In the embodiment of the present application, a liquid injection hole and a sealing member are provided on the wall surface of the housing 102, and the liquid injection hole is used for injecting the electrolyte into the accommodating chamber; the sealing member with annotate liquid hole phase-match, the sealing member is used for the shutoff to annotate the liquid hole, prevents that electrolyte from flowing, guarantees the normal use of battery. Wherein, the hole diameter of the liquid injection hole can be 0.5mm-2.0mm, and the optimal hole diameter of the liquid injection hole is 1 mm.

In the embodiment of the application, an extension groove is formed in a wall surface of the casing 102, the extension groove is recessed toward the battery core 20, and the extension groove penetrates through the wall surface of the whole casing 102, that is, the extension groove divides one wall surface of the casing 102 into two sub-wall surfaces, and the two sub-wall surfaces can be close to or far away from each other along the wall surface of the extension groove; when the battery cell 20 expands due to long-term use, the expanded battery cell 20 may press against the inner wall of the casing 102, the casing 102 will receive a pushing force in a direction toward the outside of the accommodating chamber, and since the casing 102 is a rigid casing, when the casing 102 receives the pushing force, the casing 102 is prone to be broken, and even the connection between the casing 102 and the bottom plate 101 is torn off; the extension groove can buffer the thrust applied to the casing 102, and prevent the wall surface of the casing 102 from being broken and the connection between the casing 102 and the bottom plate 101 from being torn off after the battery cell 20 is used for a long time.

Referring to fig. 8, in the embodiment of the present application, a pressure relief groove 107 is formed in any corner of the bottom plate 101, the pressure relief groove 107 is recessed toward the battery cell 20, and the thickness of the bottom plate 101 at the pressure relief groove 107 is smaller than the thickness of other areas of the bottom plate 101; when the battery cell 20 is burst or exploded due to long-term use or other external factors, the battery will first burst from the pressure relief groove 107, but will not burst from other positions in a large area, thereby reducing the risk of battery explosion.

In the battery provided in this embodiment, the battery cell 20 and the at least one connecting member 30 are all packaged in the external packaging case 10, the outer wall of the main body portion of the battery cell 20 is provided with at least one notch portion, the connecting member 30 is accommodated in the notch portion, the connecting member 30 is electrically connected to the first output portion 2011 of the main body portion, and the connecting member 30 is further used for being connected to an external device, so that the battery can supply power to the external device. The gap part provides an accommodating space for the connecting piece 30, and avoids the connecting piece 30 from occupying the use space of the external packaging shell 10, thereby reducing the volume of the external packaging shell 10 and improving the energy density of the battery.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery, comprising: the battery comprises an outer packaging shell, a battery core and at least one connecting piece, wherein the battery core and the at least one connecting piece are packaged in the outer packaging shell;

the battery cell comprises a body part, a first output part and a second output part, wherein the first output part and the second output part are arranged on the body part;

the battery cell further comprises at least one notch part, and the connecting piece is accommodated in the notch part;

the first output portion is electrically connected to the connecting member.

2. The battery according to claim 1,

the battery comprises a first connecting piece and a second connecting piece, and the battery cell comprises a first gap part and a second gap part;

the first connecting piece is accommodated in the first gap part, and the second connecting piece is accommodated in the second gap part;

the first output part is electrically connected with the first connecting piece;

the second output part is electrically connected with the second connecting piece.

3. The battery according to claim 2,

the first connecting piece and the second connecting piece are located on the same side of the battery cell in the length direction.

4. The battery according to claim 1,

the outer packaging shell comprises a bottom plate and a shell body covering the bottom plate, and the battery cell and the connecting piece are positioned between the bottom plate and the shell body;

the connecting piece deviates from one side setting of breach portion is in on the bottom plate, the connecting piece deviates from one side of breach portion is including running through the bulge of bottom plate.

5. The battery according to claim 4,

an insulating glue layer is arranged between the connecting piece and the bottom plate, and the projection of the connecting piece on the bottom plate is located in the projection of the insulating glue layer on the bottom plate.

6. The battery according to claim 5,

the projection of the single side of the insulating glue layer on the bottom plate is a first projection, the projection of the corresponding boundary of the connecting piece on the bottom plate is a second projection, and the distance between the first projection and the second projection is larger than 1.5 millimeters.

7. The battery according to claim 4,

the bottom plate is provided with a mounting hole, and the protruding part is arranged in the mounting hole in a penetrating manner;

and an insulating glue layer is arranged between the convex part and the hole wall of the mounting hole.

8. The battery according to claim 4,

the battery comprises a first connecting piece and a second connecting piece;

the first connecting piece comprises a first body part and a first connecting part, the first connecting part is connected with the first output part, a first protruding part is arranged on the surface of the first body part, which is far away from the first connecting part, and the first protruding part penetrates through the bottom plate;

the second connecting piece comprises a second body part and a second connecting part, the second connecting part is connected with the second output part, a second protruding part is arranged on the surface, deviating from the second connecting part, of the second body part, and the second protruding part penetrates through the bottom plate.

9. The battery according to claim 8,

the battery further comprises a first insulating sheet and a second insulating sheet, wherein the first insulating sheet is arranged between the first connecting portion and the body portion of the battery cell, and the second insulating sheet is arranged between the second connecting portion and the body portion of the battery cell.

10. The battery according to claim 1,

the battery further includes a third insulating sheet disposed between the exterior packaging case and the first output portion.

11. The battery according to claim 4,

the battery cell comprises a plurality of first pole pieces, a plurality of first pole lugs extending along the length direction of the first pole pieces, a plurality of second pole pieces and a plurality of second pole lugs extending along the length direction of the second pole pieces, wherein the first pole pieces and the second pole pieces are arranged in a stacked mode, and gaps are arranged at corresponding positions, close to the bottom plate, of the first pole pieces and the second pole pieces so as to form the gap parts;

the first output part is a plurality of first tabs;

the second output part is a plurality of the second tabs.

12. The battery according to claim 11,

the battery comprises a first connecting piece and a second connecting piece;

the first connecting piece comprises a first body part and a first connecting part;

the second connector comprises a second body part and a second connecting part;

the first tabs comprise bent parts bent towards the battery cell, the bent parts of all the first tabs are stacked to form the first output part, and the first output part is connected with the side face, away from the first connecting part, of the first body part;

the plurality of second tabs comprise bent parts bent towards the battery cell, the bent parts of all the second tabs are stacked to form the second output part, and the second output part is connected with the side face, away from the second connecting part, of the second body part.

13. The battery according to claim 11,

in the thickness direction of the first pole piece or the second pole piece, the thickness of the notch portion is the thickness of at least one first pole piece or the thickness of at least one second pole piece.

14. The battery according to claim 4,

the edge of the shell facing the bottom plate is provided with an arc-shaped folded edge, and the arc-shaped folded edge is in fit welding with the bottom plate.

15. The battery according to claim 4,

the shell is formed by surrounding a cover plate and at least three vertical plates vertical to the cover plate;

a first fillet structure is arranged at the junction of two adjacent vertical plates, and the radius of the first fillet structure is 1.0mm-5.0 mm;

and/or

And a second fillet structure is arranged at the junction of the vertical plate and the cover plate, and the radius of the second fillet structure is 0.1-0.5 mm.