CN115398719A

CN115398719A - Battery and electric device with same

Info

Publication number: CN115398719A
Application number: CN202080099878.9A
Authority: CN
Inventors: 王辉; 方晓东; 林礼清
Original assignee: Ningde Amperex Technology Ltd
Current assignee: Ningde Amperex Technology Ltd
Priority date: 2020-06-18
Filing date: 2020-06-18
Publication date: 2022-11-25
Also published as: WO2021253358A1

Abstract

A battery (100, 200, 300, 400) includes a casing (10) and a cell (20) housed within the casing (10). The housing (10) includes a first case (11) and a second case (12) attached to the first case (11). The battery core (20) is provided with a first tab (210). The first shell (11) comprises an end face (110) and a side wall (111) arranged around the edge of the end face (110), and the second shell (12) and the end face (110) are located on two opposite sides of the side wall (111). The side wall (111) comprises a first side wall area (112) and a second side wall area (113) connected with the first side wall area (112), and the second side wall area (113) is arranged in a protruding mode relative to the first side wall area (112) and limits a first containing space (1130). The first tab (210) is at least partially accommodated in the first accommodating space (1130).

Description

Battery and electric device with same

Technical Field

The present disclosure relates to a battery, and more particularly, to a battery and an electric device having the same.

Background

Batteries are widely used in the field of portable electronic devices and the like because of their portability. As is well known, a battery generally includes a case, a top cover, and a cell. The battery cell is located inside the shell, and in order to place the tab in the shell, the pole piece of the battery cell needs to be cut, that is, the placement space of the tab is replaced by a loss pole piece, so that the energy density of the battery is low.

Disclosure of Invention

In view of the above, it is desirable to provide a battery capable of improving the energy density of the battery.

In addition, it is also necessary to provide an electric device having the battery.

The application provides a battery, including shell and holding in the electric core in the shell. The housing includes a first shell and a second shell mounted to the first shell. And a first tab is arranged on the battery cell. The first shell comprises an end face and a side wall arranged around the edge of the end face, and the second shell and the end face are located on two opposite sides of the side wall. The side wall comprises a first side wall area and a second side wall area connected with the first side wall area, and the second side wall area is arranged in a protruding mode compared with the first side wall area and limits a first containing space. The first tab is at least partially accommodated in the first accommodating space.

In some embodiments of the present application, the first tab is completely accommodated in the first accommodating space.

In some aspects of the present disclosure, the second sidewall region includes two first connection faces connected to the first sidewall region and a second connection face connected between the two first connection faces. The end face comprises an arc section and a broken line section, the first side wall area is an arc side wall and is connected with the arc section, and the second side wall area is connected with the broken line section.

In some aspects of the present disclosure, a radius of a circle defined by the circle segment is definedR, and the distance between the second connecting surface and the center of the circle defined by the circular arc section is L ₁ Then R and L ₁ The following relationship is satisfied: l is not more than 0.1mm ₁ -R≤5mm。

In some aspects of the present disclosure, a distance between two of the first connecting surfaces is defined as L ₂ The width of the first tab is W, and L is ₂ And W satisfies the following relationship: l is not more than 0.1mm ₂ -W≤1mm。

In some embodiments of the present application, the second sidewall region is provided with a first terminal electrically isolated from the second sidewall region, and the first terminal is electrically connected to the first terminal.

In some embodiments of the present application, the first casing and the second casing are welded or fixed by an insulating pad, and the battery core is further provided with a second tab electrically connected to the housing.

In some embodiments, the sidewall further includes a third sidewall region connected to the first sidewall region, and the third sidewall region protrudes from the first sidewall region and defines a second receiving space.

In some modes of the present application, a second terminal is disposed on the third sidewall region, a second terminal ear is further disposed on the battery cell, and the second terminal ear is electrically connected to the second terminal and is at least partially accommodated in the second accommodating space.

In some modes of this application, third side wall district corresponds the second is connected the face and is provided with the outer joint face, the second connect the face with the outer joint face is in contained angle between the projection on the terminal surface is 10 degrees ~ 180 degrees.

In some aspects of the present disclosure, the sidewall further comprises a fourth sidewall region connecting the first sidewall region, the fourth sidewall region being planar.

In some embodiments of the present application, the battery cell further includes a second tab electrically connected to the fourth sidewall region.

In some embodiments of the present application, the first casing and the second casing are fixed through an insulating pad, the first tab is electrically connected to the first casing, the battery core is further provided with a second tab, and the second tab is electrically connected to the second casing.

The application also provides an electric device comprising the battery.

Compared with the prior art, the battery pole piece cutting device has the advantages that the protruding second side wall area is arranged in the side wall, at least part of the first pole lug is contained in the second side wall area, so that the situation that the space for placing the first pole lug is replaced by a cutting pole piece can be avoided, meanwhile, the empty waste of the space near the first pole lug can be avoided, and the energy density of the battery is improved. Because set up convex second lateral wall district promptly in order to accept first utmost point ear, can avoid the existence of first utmost point ear to lead to pole piece self width to diminish.

Drawings

Fig. 1 is a schematic diagram of a battery structure according to an embodiment of the present application.

Fig. 2 is a top view of the battery shown in fig. 1.

Fig. 3 is a cross-sectional view of the cell shown in fig. 1 taken along III-III.

Fig. 4 is a schematic diagram of a battery according to another embodiment of the present application.

Fig. 5 is a cross-sectional view of the battery shown in fig. 4.

Fig. 6 is a schematic diagram of a battery according to yet another embodiment of the present application.

Fig. 7 is a sectional view of a battery according to still another embodiment of the present application.

Fig. 8 is a block diagram of an electronic device according to an embodiment of the present application.

Description of the main elements

Power utilization device 1

Outer casing 10

First housing 11

Second housing 12

First pole post 13

Liquid filling plug 14

Second pole post 15

Battery cell 20

First pole piece 21

Second pole piece 22

Batteries

100, 200, 300, 400

End face 110

Side wall 111

First sidewall region 112

Second sidewall region 113

Third sidewall region 114

Fourth sidewall region 115

First tab 210

First pole ear 211

Second pole ear 212

Second tab 220

Arc segment 1101

Broken line segment 1102

First connection surface 1131

Second connection surface 1132

Second receiving space 1140

Radius R

Center of circle O

Distance L ₁ 、L ₂

Width W

Angle theta

The following detailed description will further illustrate the present application in conjunction with the above-described figures.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the 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.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following embodiments, features of the embodiments may be combined with each other without conflict.

Referring to fig. 1 to 3, an embodiment of the present application provides a battery 100, which includes a casing 10 and a battery cell 20 accommodated in the casing 10. The housing 10 includes a first case 11 and a second case 12 mounted to the first case 11. A first tab 210 is disposed on the battery cell 20.

The first housing 11 includes an end surface 110 and a sidewall 111 disposed around an edge of the end surface 110, and the second housing 12 and the end surface 110 are located on opposite sides of the sidewall 111. The sidewall 111 includes a first sidewall area 112 and a second sidewall area 113 connected to the first sidewall area 112, wherein the second sidewall area 113 is protruded from the first sidewall area 112 and defines a first receiving space 1130. The first tab 210 is at least partially received in the first receiving space 1130.

It is understood that, as shown in fig. 3, the battery cell 20 includes a first pole piece 21, a separator (not labeled), and a second pole piece 22, and the first pole piece 21, the separator, and the second pole piece 22 may be laminated to form the battery cell 20. The first tab 210 is electrically connected to the first pole piece 21. Generally, in order to prevent the tabs from being stretched by force to cause pole piece dislocation and short circuit, the first tab 210 needs to be bent into a U shape, as shown in fig. 3, the bent first tab 210 includes a first tab portion 211 and a second tab portion 212 which are connected with each other, and the second tab portion 212 is located between the first tab portion 211 and the first pole piece 21. The first tab 210 is at least partially received in the first receiving space 1130, and a part of the first tab portion 211 may be received in the first receiving space 1130, or all of the first tab portion 211 and a part of the second tab portion 212 may be received in the first receiving space 1130.

This application sets up convex second lateral wall district 113 in lateral wall 111, and will first utmost point ear 210 at least part accept in second lateral wall district 113, consequently can avoid exchanging with the cutting pole piece first utmost point ear 210 place the space, also can avoid near the space vacancy waste of first utmost point ear 210 simultaneously, improve battery 100 energy density. That is, because the second sidewall area 113 is protruded to accommodate the first tab 210, the existence of the first tab 210 can be avoided to cause the width of the pole piece itself to become smaller, that is, the pole piece can be prepared into a circular shape, and the pole piece is not required to be cut to reserve a space in the case 10 for placing the first tab 210.

In this embodiment, the first tab 210 is completely received in the first receiving space 1130. By completely accommodating the first tab 210 in the first accommodating space 1130, the first tab 210 does not occupy the width of the pole piece at all, so that the energy density of the battery 100 is maximized. For example, when the first tab 210 is bent into a U shape, the first tab portion 211 and the second tab portion 212 are completely received in the first receiving space 1130.

As shown in fig. 1 and fig. 2, in the present embodiment, the second sidewall region 113 includes two first connection surfaces 1131 connected to the first sidewall region 112 and a second connection surface 1132 connected between the two first connection surfaces 1131. The end surface 110 includes an arc segment 1101 and a broken line segment 1102, the first sidewall area 112 is an arc sidewall and connects the arc segment 1101, and the second sidewall area 113 connects the broken line segment 1102. In the present embodiment, the second sidewall area 113 defines a first receiving space 1130 having a substantially rectangular parallelepiped shape, and the end surface 110 is a substantially circular shape with an increased angle.

Further, a radius of a circle defined by the circular arc segment 1101 is defined as R, and a distance between the second connection surface 1132 and a center O of the circle defined by the circular arc segment 1101 is defined as L ₁ Then R and L ₁ The following relationship is satisfied: l is more than or equal to 0.1mm ₁ -R is less than or equal to 5mm. Wherein the distance L ₁ The difference from the radius R may be set according to the thickness of the first tab 210.

Of course, in other embodiments, the end surface 110 may be approximately elliptical, and the specific shape of the end surface 110 is not limited by the description in this application.

Further, as shown in fig. 2, a distance between two of the first connecting surfaces 1131 is defined as L ₂ The width of the first tab 210 is W, then L ₂ And W satisfies the following relationship: l is not more than 0.1mm ₂ W is less than or equal to 1mm. Wherein the distance L ₂ That is, the width of the first receiving space 1130 of the second sidewall area 113 is such that the width of the first tab 210 is slightly smaller than the width of the first receiving space 1130, which is convenient for receiving the first tab 210 in the first receiving space 1130 during assembly.

As shown in fig. 1 and fig. 3, in the present embodiment, a first terminal 13 electrically isolated from the second sidewall region 113 is disposed on the second sidewall region 113, and the first tab 210 is electrically connected to the first terminal 13. The first tab 210 may be provided with an insulating glue (not shown), and the insulating glue is used to electrically isolate the first tab 210 from the sidewall 111, so as to avoid a short circuit. Referring to fig. 1, the first electrode post 13 may be disposed on the second connection surface 1132. Of course, in other embodiments, the first pole 13 can also be disposed on the first connection surface 1131. In other embodiments, the first pole 13 may also be disposed on the second housing 12.

Further, the first casing 11 and the second casing 12 are fixed by welding or by an insulating pad, as shown in fig. 3, a second tab 220 is further disposed on the battery cell 20, and the second tab 220 is electrically connected to the outer casing 10.

As such, the first electrode post 13 may exhibit the same electrical polarity as the first tab 210. Meanwhile, when the first shell 11 and the second shell 12 are fixed by welding, the second tab 220 may be electrically connected to the second shell 12 of the outer shell 10, or may be electrically connected to any position of the first shell 11 of the outer shell 10 (e.g., the first sidewall area 112 or the end surface 110), so that the outer shell 10 as a whole exhibits the same electrical polarity as the second tab 220. When the first shell 11 and the second shell 12 are fixed by the insulating pad, the first shell 11 and the second shell 12 are electrically isolated, and at this time, the second tab 220 may be electrically connected to the second shell 12 of the housing 10, or may be electrically connected to any position (e.g., the first sidewall area 112 or the end surface 110) of the first shell 11 of the housing 10, so that a portion of the housing 10 electrically connected to the second tab 220 has the same electrical polarity as the second tab 220.

The first housing 11 and the second housing 12 may be made of metal. For example, the first housing 11 and the second housing 12 may be made of steel alloy, aluminum alloy, iron alloy, copper alloy, nickel alloy, or the like. Optionally, the first housing 11 and the second housing 12 are made of stainless steel.

When manufacturing, the first housing 11 and the second housing 12 may be formed into a desired shape by using laser cutting, machining, and the like. The first housing 11 may also be formed by punching to form a punched pit for accommodating the battery cell 20.

In the present embodiment, as shown in fig. 1, the second case 12 is provided with a pour hole (not shown) through which an electrolyte can be poured. And a liquid injection plug 14 is arranged in the liquid injection hole, and the liquid injection plug 14 is used for sealing the liquid injection hole, so that the injected electrolyte is prevented from leaking or external impurities are prevented from entering the battery 100. Of course, the pour hole may also be located on the first casing 11.

Referring to fig. 4 and 5, another embodiment of the present disclosure further provides a battery 200. The difference from the battery 100 is that the sidewall 111 further includes a third sidewall region 114 connected to the first sidewall region 112, and the third sidewall region 114 is protruded from the first sidewall region 112 and defines a second receiving space 1140.

Further, as shown in fig. 5, a second pole column 15 is disposed on the third sidewall region 114, a second pole ear 220 is further disposed on the battery cell 20, and the second pole ear 220 is electrically connected to the second pole column 15 and at least partially accommodated in the second accommodating space 1140.

In the present application, the protruding third sidewall region 114 is additionally disposed in the sidewall 111, and the second tab 220 is at least partially accommodated in the third sidewall region 114, so that a placement space for replacing the second tab 220 with a cutting pole piece can be avoided, and the energy density of the battery 200 can also be improved.

In this embodiment, the third sidewall area 114 is provided with an outer connection surface corresponding to the second connection surface 1132, and an included angle θ between the second connection surface 1132 and a projection of the outer connection surface on the end surface 110 is 10 degrees to 180 degrees. The included angle θ is an included angle between projections of the first tab 210 and the second tab 220 on the end surface 110. As shown in fig. 5, the included angle θ may be selected to be 180 degrees. The included angle θ may be set according to the internal structure of the electric device, so that the battery 200 can be adapted to the internal space of the electric device.

Referring to fig. 6, a battery 300 is also provided according to another embodiment of the present application. The difference from the battery 100 is that the sidewall 111 further includes a fourth sidewall region 115 connecting the first sidewall region 112, and the fourth sidewall region 115 is a plane.

By providing the fourth sidewall region 115 as a flat surface, the battery 300 can also be adapted to the interior space of the electrical device, and the second tab 220 can be easily electrically connected to the fourth sidewall region 115.

Referring to fig. 7, a battery 400 is further provided according to another embodiment of the present application. The battery 400 may have the first case 11 and the second case 12 having the same shape as the

battery

100, 200, or 300, and is different from the

battery

100, 200, or 300 in that the first case 11 of the battery 400 does not need to be provided with a terminal post. At this time, the first housing 11 and the second housing 12 are fixed by a sealing ring (not shown), the first tab 210 is electrically connected to the first housing 11, and the second tab 220 is electrically connected to the second housing 12.

Therefore, the first casing 11 may exhibit the same electrical polarity as the first tab 210, and the second casing 12 may exhibit the same electrical polarity as the second tab 220, that is, the electrical polarity of the battery cell 20 may also be led out through the first casing 11 and the second casing 12.

Referring to fig. 8, the present application further provides an electric device 1, where the electric device 1 includes the battery 100 (or the

batteries

200, 300, and 400) as described above. The electric device 1 may be a consumer electronic product, such as a smart phone. It is understood that in other embodiments, the electric device 1 may also be a power tool, an energy storage device, a power device, or the like. For example, the electric device 1 may be an electric vehicle.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

A battery comprises a shell and a battery cell accommodated in the shell, wherein the shell comprises a first shell and a second shell arranged on the first shell, a first electrode lug is arranged on the battery cell, and the battery is characterized in that,

the first shell comprises an end face and a side wall arranged around the edge of the end face, and the second shell and the end face are positioned on two opposite sides of the side wall;

the side wall comprises a first side wall area and a second side wall area connected with the first side wall area, and the second side wall area is arranged in a protruding mode compared with the first side wall area and defines a first accommodating space;

the first tab is at least partially accommodated in the first accommodating space.
The battery of claim 1, wherein the first tab is completely received in the first receiving space.
The battery of claim 1, wherein said second sidewall region includes two first connection faces connecting said first sidewall region and a second connection face connecting between two of said first connection faces;

the end face comprises an arc section and a broken line section, the first side wall area is an arc side wall and is connected with the arc section, and the second side wall area is connected with the broken line section.
The battery of claim 3, wherein a radius of a circle defined by the circular arc segment is defined as R, and a distance between the second connection surface and a center of the circle defined by the circular arc segment is defined as L ₁ Then R and L ₁ The following relationship is satisfied: l is not more than 0.1mm ₁ -R≤5mm。
The battery of claim 4, wherein a distance between two of the first connection faces is defined as L ₂ The width of the first tab is W, and L is ₂ And W satisfies the following relationship: l is not more than 0.1mm ₂ -W≤1mm。
The battery of any one of claims 3-5, wherein the second sidewall region has a first terminal electrically isolated from the second sidewall region, and the first tab is electrically connected to the first terminal.
The battery of claim 6, wherein the first casing and the second casing are fixed by welding or an insulating pad, and the cell is further provided with a second tab electrically connected to the housing.
The battery of claim 6, wherein the sidewall further comprises a third sidewall section connecting the first sidewall section, the third sidewall section being protrudingly disposed compared to the first sidewall section and defining a second receiving space.
The battery of claim 8, wherein a second terminal post is disposed on the third sidewall region, and a second terminal ear is disposed on the battery cell, and the second terminal ear is electrically connected to the second terminal post and at least partially received in the second receiving space.
The battery of claim 8, wherein the third sidewall area is provided with an outer connecting surface corresponding to the second connecting surface, and an included angle between the second connecting surface and a projection of the outer connecting surface on the end surface is 10 degrees to 180 degrees.
The battery of claim 6, wherein the sidewall further comprises a fourth sidewall region connecting the first sidewall region, the fourth sidewall region being planar.
The battery of claim 11, wherein the cell further comprises a second tab electrically coupled to the fourth sidewall region.
The battery of claim 1, wherein the first casing and the second casing are fixed by an insulating pad, the first tab is electrically connected to the first casing, and a second tab is further disposed on the cell and electrically connected to the second casing.
An electric device comprising the battery according to any one of claims 1 to 13.