WO2022205189A1

WO2022205189A1 - Battery and electronic device

Info

Publication number: WO2022205189A1
Application number: PCT/CN2021/084698
Authority: WO
Inventors: 刘道林; 邱慎照; 丁宇
Original assignee: 宁德新能源科技有限公司
Priority date: 2021-03-31
Filing date: 2021-03-31
Publication date: 2022-10-06
Also published as: CN115004458A

Abstract

A battery (100) and an electronic device having a battery (100). The battery (100) comprises an electrode assembly (10) and an arc-shaped housing assembly (20), the housing assembly (20) being used to accommodate the electrode assembly (10) and being provided with a first post (221). The electrode assembly (10) comprises a first pole piece (11), and the first pole piece (11) comprises a first current collector (111) and a first active material layer (112). The first current collector (111) comprises a first surface and a second surface that are opposite one another, and at least one among the first surface and second surface comprised by the first current collector (111) is provided with a first coating region (11a) of the first active material layer (112). A first end portion (1111) of the first current collector (111) comprises a first hollow foil region (11b) in which neither the first surface nor the second surface is provided with the first active material layer (112), and the first post (221) is connected to the first hollow foil region (11b).

Description

Batteries and Electronic Equipment

technical field

The present application relates to the technical field of energy storage, and in particular, to a battery and an electronic device.

Background technique

In recent years, the application of smart wearable devices such as smart helmets and VR glasses has gradually heated up in the market. With the diversification of smart wearable products, the requirements for the adaptability of the battery structure are also increasing. Use with curved equipment. However, the current arc-shaped batteries still have the following problems in portable wearable electronic devices: 1. The top seal of the soft pack package occupies a large space, resulting in short welding pole pieces, small current conduction area and long conduction distance; 2. Soft pack battery Poor shaping ability, there is a risk of arc rebound.

SUMMARY OF THE INVENTION

In view of this, it is necessary to provide a battery and an electronic device, which can effectively suppress arc bounce and improve the conduction efficiency of the battery.

An embodiment of the present application provides a battery, including: an electrode assembly and an arc-shaped casing assembly, the casing assembly is used to accommodate the electrode assembly, and the casing assembly is provided with a first pole; the The electrode assembly includes a first pole piece, the first pole piece includes a first current collector and a first active material layer, the first current collector includes opposing first and second surfaces, and the first current collector includes At least one of the first surface and the second surface is provided with a first coating area of the first active material layer, and a first end of the first current collector includes the first surface and The second surface is not provided with a first empty foil area of the first active material layer, and the first pole is connected to the first empty foil area.

Further, in some embodiments, the electrode assembly further includes: a second pole piece and a diaphragm, the diaphragm is arranged between the first pole piece and the second pole piece; the second pole piece includes a second pole piece Two current collectors and a second active material layer, the second current collector includes opposing third and fourth surfaces, the second current collector includes at least one of the third surface and the fourth surface A second coating area provided with the second active material layer, the second end of the second current collector including the third surface and the fourth surface without the second active material layer the second empty foil area; the casing assembly is further provided with a guide part, and the guide part is connected to the second empty foil area.

Further, in some embodiments, the electrode assembly has a wound structure, the first pole piece includes a plurality of the first empty foil regions, and the plurality of the first empty foil regions are connected to form a first electrode ear; the second pole piece includes a plurality of the second empty foil regions, and the plurality of the second empty foil regions are connected to form a second pole ear.

Further, in some embodiments, the electrode assembly has a laminated structure, the electrode assembly includes a plurality of the first pole pieces and a plurality of the second pole pieces, and a plurality of the first empty foil regions connected to form a first tab, and a plurality of the second empty foil regions are connected to form a second tab.

Further, in some embodiments, the casing assembly includes a casing and a casing cover, the casing cover is connected to the casing, and along the bending length direction of the casing assembly, the first pole is provided at At one end of the housing cover, the conducting portion is connected to the housing assembly in an insulating manner.

Further, in some embodiments, an insulating tape is provided on the peripheral side of the second tab to be insulated from the housing assembly.

Further, in some embodiments, the electrode assembly includes a third end portion and a fourth end portion that are opposite to each other along the curved length of the housing assembly, and the first tab is located at the third end portion , the second tab is located at the fourth end.

Further, in some embodiments, the first empty foil area is integrally formed by the first coating area. In some embodiments, the second empty foil region is integrally formed by the second coating region. In some embodiments, a plurality of the first empty foil regions are directly connected by welding. In some embodiments, a plurality of the second empty foil regions are directly welded. In some embodiments, along the thickness direction of the electrode assembly, the outermost layer of the electrode assembly is the first pole piece.

Further, in some embodiments, the conducting portion is a second pole or a sheet-shaped conducting sheet.

Further, in some embodiments, along the bending length direction of the casing assembly, the conducting portion is provided on an end of the casing cover opposite to the first pole post.

Further, in some embodiments, the casing includes a bottom wall and a side wall, the bottom wall and the casing cover are located on opposite sides of the side wall, and the side wall is provided with a concave area to be connected with the side wall. The cover forms an opening through which the second pole piece extends.

Further, in some embodiments, the housing assembly further includes an insulating sheet, and the insulating sheet is provided on the housing cover and connected to the conducting portion. In some embodiments, the insulating sheet is riveted or bonded to the case cover.

Further, in some embodiments, a gasket is provided in the casing, and the third end and/or the fourth end are connected to the gasket, so as to fix the electrode assembly on the location within the housing.

Further, in some embodiments, the case assembly further includes a sealing cover, the case cover is provided with a through hole for injecting electrolyte into the case, and the sealing cover is provided in the through hole , to seal the housing.

Further, in some embodiments, an insulating sealing ring is provided on the peripheral side of the second pole piece, and a sealant is provided between the insulating sealing ring and the opening.

Further, in some embodiments, along the bending length direction of the casing assembly, the through hole is provided at the end of the casing cover or the casing.

The present application also provides an electronic device including the above-mentioned battery.

In the battery and electronic device of the present application, the casing assembly is arranged in an arc-shaped structure, which effectively suppresses the arc rebound of the electrode assembly disposed in the arc-shaped casing assembly. The first pole of the body assembly is directly connected to the first empty foil area. Compared with the conduction method of welding the tabs on the pole piece, there is no need to weld the tabs, which effectively increases the current conduction area. Conduction between the electrodes, without the need for extra welded tabs, significantly shortening the current conduction distance and effectively improving the conduction efficiency of the battery.

Description of drawings

FIG. 1 shows a schematic structural diagram of a battery in some embodiments of the present application.

FIG. 2 shows a schematic diagram of the exploded structure of the battery in FIG. 1 .

FIG. 3 shows a schematic structural diagram of an electrode assembly in some embodiments of the present application.

FIG. 4 shows a schematic structural diagram of the first pole piece in some embodiments of the present application.

FIG. 5 shows a schematic structural diagram of the second pole piece in some embodiments of the present application.

FIG. 6 shows a schematic structural diagram of the first pole piece in other embodiments of the present application.

FIG. 7 shows a schematic structural diagram of a battery in still other embodiments of the present application.

Description of main component symbols

battery 100

Electrode assembly 10

third end 10a

Fourth end 10b

Insulation tape 10c

The first pole piece 11

The first coating area 11a

The first empty foil area 11b

First tab 111b

The first collector 111

first end 1111

Second pole piece 12

The second coating area 12a

The second empty foil area 12b

second tab 121b

The second collector 121

second end 1211

Diaphragm 13

Housing assembly 20

Through hole 20a

Sealing cover 20b

Shell 21

Bottom wall 211

side wall 212

Depressed area 2121

Shell cover 22

Connection hole 22a

Insulation sheet 22b

The first pole 221

Guide part 222

Insulation sealing ring 2221

Sealant 2222

Bending length direction T

The following specific embodiments will further illustrate the present application in conjunction with the above drawings.

Detailed ways

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments.

It should be noted that when a component is referred to as being "mounted on" another component, it can be directly on the other component or there may also be an intervening component. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a co-existing centered component.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs. The terms used herein in the specification of the application are for the purpose of describing specific embodiments only, and are not intended to limit the application. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.

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

Referring to FIGS. 1 and 2 , some embodiments of the present application provide a battery 100 . The battery 100 includes an electrode assembly 10 , a housing assembly 20 and an electrolyte (not shown). The casing assembly 20 is arranged in an arc shape, and the electrode assembly 10 and the electrolyte are arranged in the casing assembly 20 . The housing assembly 20 is arranged in an arc-shaped structure, which effectively suppresses the arc rebound of the electrode assembly 10 disposed in the arc-shaped housing assembly 20 . In some embodiments, the housing assembly 20 includes a steel shell.

Referring to FIG. 3 , the electrode assembly 10 includes a first pole piece 11 , a second pole piece 12 and a diaphragm 13 disposed between the first pole piece 11 and the second pole piece 12 , and the diaphragm 13 is used to prevent the first pole piece 11 It is in direct contact with the second pole piece 12 so as to prevent the electrode assembly 10 from being short-circuited.

4, the first pole piece 11 includes a first current collector 111, the first current collector 111 includes a first surface and a second surface, the first surface and/or the second surface is provided with a first active material layer 112, to A first coating region 11a is formed. The first current collector 111 further includes a first end portion 1111, and neither the first surface nor the second surface where the first end portion 1111 is located is provided with the first active material layer 112, so as to form a first empty foil region 11b. The foil region 11b is connected to the housing assembly 20 .

In some embodiments, the first empty foil region 11b is integrally formed with the first coating region 11a.

Referring to FIG. 5, the second pole piece 12 includes a second current collector 121, the second current collector 121 includes a third surface and a fourth surface, and the third surface and/or the fourth surface is provided with a second active material layer 122, to A second coating region 12a is formed. The second current collector 121 further includes a second end portion 1211, and the second active material layer 122 is not provided on the third surface and the fourth surface where the second end portion 1211 is located, so as to form a second empty foil region 12b. The foil region 12b is connected to the housing assembly 20 .

In some embodiments, the second empty foil region 12b is integrally formed with the second coating region 12a.

It can be understood that, depending on the structure of the electrode assembly 10, the positions of the first end 1111 of the first current collector 111 and the second end 1211 of the second current collector 121 will also change correspondingly. For example, the first end 1111 is set at The upper end of the first current collector 111 and the second end portion 1211 are provided on the upper end of the second current collector 121 .

Referring to FIG. 6 , in some embodiments, the electrode assembly 10 is a wound structure. Taking the unrolled first pole piece 11 as an example, the first pole piece 11 is provided with a plurality of first empty foil regions 11b, a plurality of first The empty foil regions 11 b are arranged at intervals on the upper end of the first current collector 111 , and at this time, the first end 1111 of the first current collector 111 is located at the upper end of the first current collector 111 . After the first pole piece 11 and the second pole piece 12 are stacked and wound, the plurality of first empty foil regions 11b are located on the same straight line along the thickness direction of the winding of the electrode assembly 10, and the plurality of first empty foil regions 11b are connected to form The first tab is connected to the housing assembly 20 . Similarly, the plurality of second empty foil regions 12b of the second pole piece 12 are connected to form second pole tabs, and the second tabs are connected to the housing assembly 20 .

Referring to FIG. 3 , in other embodiments, the electrode assembly 10 is a laminated structure, and along the bending length direction of the casing assembly 20 , the electrode assembly 10 includes a third end portion 10 a and a fourth end portion 10 b disposed opposite to each other. The electrode assembly 10 includes a plurality of stacked first pole pieces 11 and second pole pieces 12 and a separator 13 disposed between the first pole pieces 11 and the second pole pieces 12 . Each of the first pole pieces 11 includes a first coating area 11 a and a first empty foil area 11 b , and the first empty foil area 11 b is provided at the side end of the first pole piece 11 . Each of the second pole pieces 12 includes a second coating area 12 a and a second empty foil area 12 b , and the second empty foil area 12 b is disposed at the side edge of the second pole piece 12 . The first coating area 11a is arranged opposite to the second coating area 12a, the first empty foil area 11b and the second empty foil area 12b are arranged opposite to both ends of the electrode assembly 10, and the plurality of first empty foil areas 11b are directly welded to form The first tab 111b, the first tab 111b is located at the third end 10a of the electrode assembly 10, the plurality of second empty foil regions 12b are directly welded to form the second tab 121b, and the second tab 121b is located on the electrode assembly 10. The fourth end portion 10b, the first tab 111b and the second tab 121b are used to connect to the housing assembly 20, respectively. In this embodiment, the first end portion 1111 of the first current collector 111 corresponding to each first pole piece 11 is located at the side end of the first pole piece 11 , and the second current collector 121 corresponding to each second pole piece 12 The second end portion 1211 is located at the side end of the second pole piece 12 . Therefore, when the electrode assembly 10 is of a wound or laminated structure, the positions of the first empty foil area 11 b and the second empty foil area 12 b vary with the structure of the electrode assembly 10 .

Referring to FIG. 2 , along the thickness direction of the electrode assembly 10 , the outermost layer of the electrode assembly 10 is the first pole piece 11 , the second pole piece 12 is insulated from the housing assembly 20 , and the peripheral side of the second pole lug is wrapped with Insulating tape 10c to insulate from housing assembly 20.

It can be understood that when the corresponding empty foil areas of the first pole piece 11 and the second pole piece 12 are of heterosexual structures, the first pole tab and the second pole tab may be located at the same end of the electrode assembly 10, or may be located at the same end of the electrode assembly 10, respectively. At both ends of the electrode assembly 10 , the positions of the first empty foil region 11 b and the second empty foil region 12 b may not interfere with each other.

Referring to FIG. 2 , the case assembly 20 includes an arc-shaped case 21 and a case cover 22 . The case 21 is used for placing the electrode assembly 10 , and the case cover 22 is connected to the case 21 .

A gasket (not shown) is provided in the casing 21, and the third end 10a and/or the fourth end 10b of the electrode assembly 10 are in contact with the gasket, thereby inhibiting the movement of the electrode assembly 10 in the casing 21 and making it stable The position of the electrode assembly 10 in the housing 21 reduces the position of the electrode assembly 10 is not fixed, resulting in poor welding positions between the first tab and the corresponding first pole, and the second tab and the corresponding conducting portion 222, thereby affecting the Conductivity of the tabs. In one embodiment, the conducting portion 222 may be a second pole or a sheet-shaped conducting sheet. This embodiment is described with the second pole.

Along the bending length direction T of the casing assembly 20 , the casing cover 22 or the end of the casing 21 is further provided with a through hole 20 a , the through hole 20 a is covered with a sealing cover 20 b , and the through hole 20 a is used for injecting into the casing 21 The electrolyte, the sealing cover 20b is used to cover the through hole 20a and seal the casing 21 . By providing the through hole 20a at the end of the case cover 22 or the case 21, the injection and absorption of the electrolyte are facilitated.

The housing assembly 20 is provided with a first pole 221 for connecting with the first tab and a second pole 222 for connecting with the second tab. It can be understood that, the first pole 221 and the second pole 222 can be connected to the case cover 22 , can also be connected to the casing 21 , and can also be disposed out of the casing 21 .

In some embodiments, along the bending length direction of the case 21 , the case cover 22 is provided with a first pole 221 and a second pole 222 , and the first pole 221 and the second pole 222 are opposite to the side of the case cover 22 . The ends are used to connect with the electrode assembly 10, that is, the first poles 221 are connected to the first tabs 111b formed by the plurality of first empty foil regions 11b, and the second poles 222 are connected to the plurality of second empty foil regions 12b The second tab 121b is formed. The second pole 222 needs to be insulated from the case assembly 20 , so an insulating sheet 22 b is provided in the connecting hole 22 a of the case cover 22 , and the second pole 222 passes through the insulating sheet 22 b and is connected to the case cover 22 . In some embodiments, an insulating sheet 22b is riveted or bonded in the connection hole 22a of the case cover 22 .

Referring to FIG. 7 , in other embodiments, the housing assembly 20 includes a housing 21 and a housing cover 22 arranged in an arc shape, and the housing cover 22 is connected to the housing 21 . The casing 21 includes a bottom wall 211 and a side wall 212 . The bottom wall 211 and the casing cover 22 are located on both sides of the side wall 212 . The housing assembly 20 is provided with a first pole 221 and a second pole piece 222, the first pole 221 is connected to the end of the cover 22 and is connected to the first pole tab 111b, and the second pole piece 222 is connected to the second pole tab 121b and protrudes out of the housing 21 from the opening. The second pole piece 222 needs to be insulated from the housing assembly 20 . Therefore, the peripheral side of the second pole piece 222 is covered with an insulating sealing ring 2221 , and a sealant 2222 is also provided between the insulating sealing ring 2221 and the opening. Therefore, it is ensured that the second pole piece 222 is insulated from the housing assembly 20 .

In the battery 100 of the present application, the case assembly 20 is arranged in an arc-shaped structure, which effectively suppresses the arc rebound of the electrode assembly 10 disposed in the arc-shaped case assembly 20, and is directly connected by welding the plurality of first empty foil regions 11b. The first pole tab 111b is formed, and the plurality of second empty foil regions 12b are directly welded and connected to form the second pole tab 121b, so that the ends of the first pole piece 11 and the second pole piece 12 are directly connected to the housing assembly 20, which effectively increases the Large current conduction area, the current is conducted between the electrode assembly 10 and the shell assembly 20. Compared with the conduction method of welding the tabs on the pole piece, the current conduction distance is significantly shortened, thereby reducing the internal resistance of the battery and improving the conduction efficiency of the battery. Solve the heat dissipation problem of high energy density and improve the battery fast charging performance.

Some embodiments of the present application also provide an electronic device (not shown) using the above-mentioned battery 100 . The electronic device may be, but not limited to, consumer electronic products (eg, smart helmets, VR glasses), power tools, energy storage devices, power devices, and the like. The electronic device is provided with an accommodating cavity (not shown), and the battery 100 is accommodated in the accommodating cavity. In the battery 100, the shell assembly 20 is set as an arc structure, which effectively suppresses the arc rebound of the electrode assembly 10, which is beneficial to improve the service life of the electronic device. The heat dissipation problem of high energy density and the improvement of battery fast charging performance are conducive to improving the user experience.

Those of ordinary skill in the art should realize that the above embodiments are only used to illustrate the present application, not to limit the present application, as long as the above embodiments are appropriately changed within the spirit and scope of the present application and variations are within the scope of this disclosure.

Claims

A battery, characterized in that, comprising:

electrode assembly, and

an arc-shaped casing assembly for accommodating the electrode assembly, and the casing assembly is provided with a first pole;

The electrode assembly includes:

A first pole piece, the first pole piece includes a first current collector and a first active material layer, the first current collector includes an opposite first surface and a second surface, and the first current collector includes the first current collector. At least one of a surface and the second surface is provided with a first coating area of the first active material layer, and a first end of the first current collector includes the first surface and the first surface The first empty foil area of the first active material layer is not provided on both surfaces, and the first pole is connected to the first empty foil area.
The battery of claim 1, wherein

The electrode assembly further includes: a second pole piece, and

a diaphragm, arranged between the first pole piece and the second pole piece;

The second pole piece includes a second current collector and a second active material layer, the second current collector includes opposing third and fourth surfaces, and the second current collector includes the third surface and the At least one of the fourth surfaces is provided with the second coating area of the second active material layer, and the second end of the second current collector including the third surface and the fourth surface is not provided a second empty foil area with the second active material layer;

The housing assembly is further provided with a guide portion, and the guide portion is connected to the second empty foil area.
The battery of claim 2, wherein the battery satisfies at least one of the following conditions:

i) The electrode assembly has a wound structure, the first pole piece includes a plurality of the first empty foil regions, and the plurality of the first empty foil regions are connected to form a first tab; the second pole the sheet includes a plurality of the second empty foil regions, the plurality of the second empty foil regions are connected to form a second tab;

ii) The electrode assembly has a laminated structure, the electrode assembly includes a plurality of the first pole pieces and a plurality of the second pole pieces, and the plurality of the first empty foil regions are connected to form the first tabs , a plurality of the second empty foil regions are connected to form second tabs.
The battery of claim 3, wherein the housing assembly further comprises:

the shell; and

A case cover is connected to the case, along the bending length direction of the case assembly, the first pole is arranged at one end of the case cover, and the conducting portion is connected to the case assembly in an insulating manner.
4. The battery of claim 3, wherein an insulating tape is provided on the peripheral side of the second tab to insulate from the housing assembly.
4. The battery of claim 3, wherein the electrode assembly includes opposite third and fourth ends along a curved length of the housing assembly, the first tab located at the At the third end, the second tab is located at the fourth end.
The battery of claim 3, wherein the battery satisfies at least one of the following conditions:

a) the first empty foil area is integrally formed by the first coating area;

b) the second empty foil area is integrally formed by the second coating area;

c) direct welding connection between a plurality of the first empty foil regions;

d) direct welding connection between a plurality of the second empty foil regions;

e) along the thickness direction of the electrode assembly, the outermost layer of the electrode assembly is the first pole piece.
5. The battery according to claim 4, wherein, along the bending length direction of the casing assembly, the conducting portion is provided on an end of the casing cover opposite to the first pole.
The battery of claim 4, wherein the casing comprises a bottom wall and a side wall, the bottom wall and the casing cover are located on opposite sides of the side wall, and the side wall is provided with a recess area to form an opening with the case cover for the second pole piece to protrude.
The battery of claim 4, wherein the housing assembly further comprises:

an insulating sheet, the insulating sheet is arranged on the casing cover and is connected to the conducting portion.
The battery according to claim 6, wherein a spacer is provided in the casing, and the third end portion and/or the fourth end portion are connected to the spacer to fix the electrode The location of the components within the housing.
The battery of claim 9, wherein the housing assembly further comprises:

A sealing cover is provided with a through hole for injecting electrolyte into the casing, and the sealing cover is arranged in the through hole to seal the casing.
The battery of claim 9, wherein an insulating sealing ring is provided on the peripheral side of the second pole piece, and a sealant is provided between the insulating sealing ring and the opening.
13. The battery of claim 12, wherein the through hole is provided at an end of the case cover or the case along a bending length direction of the case assembly.
An electronic device, comprising the battery according to any one of claims 1 to 14.