WO2021248488A1

WO2021248488A1 - Battery and electrical device

Info

Publication number: WO2021248488A1
Application number: PCT/CN2020/095932
Authority: WO
Inventors: 马武; 张国文
Original assignee: 宁德新能源科技有限公司
Priority date: 2020-06-12
Filing date: 2020-06-12
Publication date: 2021-12-16
Also published as: CN115461919B; CN115461919A

Abstract

A battery (100), which comprises a first housing (11) and a second housing (12). The first housing (11) is a rigid housing. The second housing (12) is a flexible housing and covers the first housing (11). The second housing (12) is provided with a connection layer (121), the second housing (12) is fixed to the first housing (11) by means of the connection layer (121), and the connection layer (121) comprises an insulating material. Further provided is an electrical device (1) provided with the battery (100).

Description

Batteries and electrical devices

Technical field

This application relates to the field of energy storage, and in particular to a battery and an electric device with the battery.

Background technique

Batteries are popular because of their portability and are widely used in portable electronic devices and other fields. As we all know, a battery includes a casing, a battery cell contained in the casing, and a top cover mounted on the casing. The battery needs to inject electrolyte into the shell during the production process, and then it can be used normally after the formation process.

However, a certain amount of gas is generated inside the battery during the formation process or subsequent use process, so that the gas generated inside cannot be discharged in time, causing the battery to easily expand, deform or explode, thereby reducing the safety performance and service life of the battery.

Summary of the invention

In order to solve the above shortcomings of the prior art, it is necessary to provide a battery that can avoid expansion, deformation or explosion due to increased internal pressure.

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

The present application provides a battery including a housing assembly, and the housing assembly includes a first housing and a second housing. The first housing is a rigid housing. The second shell is a flexible shell and is covered on the first shell. The second shell is provided with a connecting layer, the second shell fixes the first shell through the connecting layer, and the connecting layer includes an insulating material.

In the present application, the second housing is a flexible housing and connected to the first housing through an insulating connection layer. Compared with the welding method in the prior art, the second housing and the first housing in the present application are The connection force is relatively reduced. When gas is generated inside the battery during the formation process or during normal operation, causing the internal pressure to exceed the predetermined value, the second housing will be flushed and separated from the first housing to achieve the purpose of pressure relief and prevent The battery explodes, improving the safety and service life of the battery.

In some embodiments of the present application, the second housing further includes a metal layer, and the metal layer is connected to the connection layer.

In some embodiments of the present application, the connecting layer is bonded to the first shell, and the bonding force is greater than or equal to 7N/15mm.

In some embodiments of the present application, the melting temperature of the connection layer is 150 degrees Celsius to 170 degrees Celsius.

In some embodiments of the present application, the metal layer includes at least one of aluminum, nickel, and stainless steel.

In some embodiments of the present application, the insulating material includes polypropylene, polyurethane, polystyrene, polyethylene, polyimide, polyethylene terephthalate, polycarbonate, polyvinyl chloride, and foamed polypropylene , At least one of polyamide, rubber or silicone.

In some embodiments of the present application, the second housing further includes a protective layer, the metal layer is located between the protective layer and the connecting layer, and the protective layer includes at least one of nylon and polyvinyl chloride.

In some embodiments of the present application, the thickness of the metal layer is 0.01 mm-3 mm.

In some embodiments of the present application, the first housing includes at least one of steel alloy, aluminum alloy, iron alloy, copper alloy, nickel alloy, ceramic, carbon fiber, or rigid plastic.

In some embodiments of the present application, the battery further includes a battery cell and the battery cell is housed in the housing assembly. The electric core includes a first pole piece and a second pole piece, and the first pole piece and the second pole piece are laminated or wound to form the electric core. The battery cell also includes a first pole lug electrically connected to the first pole piece.

In some embodiments of the present application, the battery cell further includes a first adapter piece electrically connected to the first tab. The first adapter piece penetrates through the connection between the first housing and the second housing and is exposed to the housing. Body components.

In some embodiments of the present application, the battery cell further includes a second tab with a polarity different from that of the first tab and a second adapter part electrically connected to the second tab. The second adapter part passes through the first housing The connection point with the second housing passes through and is exposed to the housing assembly.

In some embodiments of the present application, the angle between the projection of the first adapter on the second housing and the projection of the second adapter on the second housing is greater than 0 degrees and less than 180 degrees.

In some embodiments of the present application, the battery cell further includes a second tab having a polarity different from that of the first tab, and the second tab is electrically connected to the first housing.

In some embodiments of the present application, the second housing is provided with a through hole penetrating the metal layer and the connection layer, the housing assembly is provided with a conductive member, the conductive member covers the through hole, and the first tab is electrically connected to the conductive member.

The application also provides an electric device, which includes the above battery.

Description of the drawings

Fig. 1 is a cross-sectional view of a housing assembly according to an embodiment of the application.

Fig. 2 is a partial enlarged view of the housing assembly shown in Fig. 1.

Fig. 3 is a top view of a battery according to an embodiment of the application.

Fig. 4 is a side view of the battery shown in Fig. 3.

Fig. 5 is a cross-sectional view of the battery shown in Fig. 3 along A-A.

Fig. 6 is a top view of a battery according to another embodiment.

Fig. 7 is a top view of a battery according to another embodiment.

FIG. 8 is a cross-sectional view of a battery according to another embodiment of the application.

Fig. 9 is a top view of a battery according to another embodiment of the application.

Fig. 10 is a cross-sectional view of the battery shown in Fig. 9 along B-B.

FIG. 11 is a cross-sectional view of a battery according to still another embodiment of the application.

FIG. 12 is a block diagram of a module structure of an electric device according to an embodiment of the application.

Symbol description of main components

Power consuming device 1

Shell components 10

The first shell 11

Second shell 12

Conductive parts 13

Cell 20

The first pole piece 21

The second pole piece 22

Battery

100, 200, 300, 400

Metal layer 120

Connection layer 121

Protection layer 122

First pole ear 210

The first adapter 211

Second pole ear 220

The second adapter 221

Through hole 1201

Thickness T

Angle θ ₁ , θ ₂ , θ ₃

The following specific embodiments will further illustrate this application in conjunction with the above-mentioned drawings.

detailed description

The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with 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. Based on the embodiments in this application, all other embodiments obtained by a person of ordinary skill in the art without creative work shall fall within the protection scope of this application.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field of this application. The terminology used in the specification of the application herein is only for the purpose of describing specific embodiments, and is not intended to limit the application.

Hereinafter, some embodiments of the present application will be described in detail with reference to the accompanying drawings. In the case of no conflict, the following embodiments and features in the embodiments can be combined with each other.

Please refer to FIG. 1, an embodiment of the present application provides a housing assembly 10 including a first housing 11 and a second housing. The first housing 11 is a rigid housing. The second housing 12 is a flexible housing and covers the first housing 11.

Please also refer to FIG. 2, the second housing 12 is provided with a connection layer 121 and also includes a metal layer 120. The connection layer 121 may be formed on the metal layer 120, the second housing 12 is connected to the first housing 11 through the connection layer 121, and the connection layer 121 includes an insulating material.

Wherein, the connecting layer 121 may be connected to the first housing 11 by means of gluing, heat sealing, injection molding, etc., so that the first housing 11 and the second housing 12 are connected as a whole.

The melting temperature of the connecting layer 121 is 150 degrees Celsius to 170 degrees Celsius, and the bonding force between the connecting layer 121 and the first housing 11 is greater than or equal to 7N/15mm.

In the present application, the second housing 12 is a flexible housing and is connected to the first housing 11 through an insulating connecting layer 121. Compared with the welding method in the prior art, the second housing 12 and the first housing in the present application The connection force between the bodies 11 is relatively reduced. When the battery generates gas during the formation process or during normal operation, causing the internal pressure to exceed a predetermined value, the second shell 12 will be washed away and separated from the first shell 11. So as to achieve the purpose of pressure relief, prevent the battery from exploding, and improve the safety and service life of the battery.

In this embodiment, the metal layer 120 includes at least one of aluminum, nickel, and stainless steel.

In this embodiment, the insulating material of the connection layer 121 includes polypropylene (PP), polyurethane (PU), polystyrene (PS), polyethylene (PE), polyimide (PI), and polyterephthalic acid. At least one of ethylene glycol ester (PET), polycarbonate (PC), polyvinyl chloride (PVC), expanded polypropylene (EPP), polyamide (PA), rubber or silicone.

Optionally, the metal layer 120 includes aluminum, and the connection layer 121 includes polypropylene, that is, the second housing 12 is a composite housing including a polypropylene layer and an aluminum layer. In another embodiment, the metal layer 120 includes stainless steel, and the connection layer 121 includes polypropylene, that is, the second shell 12 is a composite shell including a polypropylene layer and a stainless steel layer. In another embodiment, the metal layer 120 includes nickel, and the connection layer 121 includes polypropylene, that is, the second shell 12 is a composite shell including a polypropylene layer and a nickel layer.

As shown in FIG. 2, in this embodiment, the second housing 12 further includes a protective layer 122. The metal layer 120 is located between the protective layer 122 and the connecting layer 121. The protective layer 122 includes at least one of nylon and polyvinyl chloride. kind. The protective layer 122 can protect the metal layer 120 and improve the wear resistance of the second housing 12. Since nylon has high ductility and can be compressed to form a bonding interface with the metal layer 120, nylon may be used for the protective layer 122.

More specifically, the second housing 12 may further include another insulating layer (not shown) on the surface of the protective layer 122 away from the metal layer 120.

In this embodiment, the thickness T of the metal layer 120 is 0.01 mm to 3 mm. In this way, it can be ensured that the second housing 12 has high flexibility, and when the internal pressure of the housing assembly 10 exceeds a predetermined value, it can be ensured that the second housing 12 can be flushed to achieve the purpose of pressure relief.

In this embodiment, the first housing 11 includes at least one of steel alloy, aluminum alloy, iron alloy, copper alloy, nickel alloy, ceramic, carbon fiber, or rigid plastic. The first housing 11 can be formed into a desired shape by using processes such as laser cutting, machine processing, and the like. Then, as shown in the figure, the first housing 11 can also be stamped and formed to form a pit to accommodate the electric core.

Wherein, the cross-sections of the first housing 11 and the second housing 12 may be circular, square, elliptical, triangular, polygonal, or the like.

Referring to FIGS. 3 to 5, an embodiment of the present application further provides a battery 100. The battery 100 includes a battery core 20 and the aforementioned casing assembly 10, and the battery core 20 is accommodated in the casing assembly 10. The cell 20 includes a first pole piece 21, an isolation film (not shown) and a second pole piece 22. The isolation membrane is located between the first pole piece 21 and the second pole piece 22. The first pole piece 21, the isolation membrane, and the second pole piece 22 are laminated to form a cell 20, and the cell 20 further includes a first pole lug 210 electrically connected to the first pole piece 21.

In this embodiment, the cell 20 further includes a first adapter 211 electrically connected to the first tab 210, and the first adapter 211 passes through the connection of the first housing 11 and the second housing 12. And exposed to the housing assembly 10.

Therefore, when there is no pole provided on the second housing 12, the electrical polarity of the first tab 210 can also be led out of the housing assembly 10 through the first adapter 211. Since the pole and the corresponding insulating backing plate are omitted from the second casing 12, the thickness of the casing assembly 10 is reduced. When the overall volume of the battery 100 is the same, it is beneficial to increase the energy density of the battery 100. Secondly, it can avoid the pole piercing the pole piece during the squeeze test, thereby avoiding the risk of short circuit.

As shown in FIGS. 3 and 5, further, the battery cell 20 further includes a second tab 220 having a polarity different from that of the first tab 210 and a second adapter 221 electrically connected to the second tab 220. The second adapter 221 penetrates through the joint of the first housing 11 and the second housing 12 and is exposed to the housing assembly 10. Therefore, the electrical polarity of the second tab 220 can also be led out of the housing assembly 10 through the second adapter 221.

Wherein, in this embodiment, the first pole piece 21 may be an anode pole piece, that is, the first pole lug 210 and the first adapter 211 have an anode polarity; the second pole piece 22 may be a cathode pole piece, that is, the first pole piece. The diode 220 and the second adapter 221 have a cathode polarity. In another embodiment, the first pole piece 21 can also be a cathode pole piece, that is, the first tab 210 and the first adapter 211 have a cathode polarity; the second pole piece 22 can also be an anode pole piece, namely The second tab 220 and the second adapter 221 have an anode polarity.

Further, the angle between the projection of the first adapter 211 on the second housing 12 and the projection of the second adapter 221 on the second housing 12 is greater than 0 degrees and less than 180 degrees. The angle can be changed according to the position of the external electrical connector, which is not limited in this application. For example, as shown, the angle between the projection 221 of the first switching element 211 on the second housing 12 and the second projection on the second adapter housing 12 θ 3 ₁ is substantially 180 degrees. _{As shown in FIG. 6, in another embodiment, the angle θ 2} between the projection of the first adapter 211 on the second housing 12 and the projection of the second adapter 221 on the second housing 12 Less than 90 degrees. _{As shown in FIG. 7, in another embodiment, the angle θ 3} between the projection of the first adapter 211 on the second housing 12 and the projection of the second adapter 221 on the second housing 12 Roughly equal to 90 degrees.

Please refer to FIG. 8, another embodiment of the present application further provides a battery 200. In the battery 200, the first adapter 211 also penetrates through the junction of the first housing 11 and the second housing 12 and is exposed to the housing assembly 10. The difference from the battery 100 described above is that the second tab 220 of the battery 200 is electrically connected to the first housing 11. Specifically, a second adapter 221 is connected to the second tab 220, and the second tab 220 is electrically connected to the first housing 11 through the second adapter 221.

Wherein, when the first pole piece 21 and the second pole piece 22 are respectively an anode pole piece and a cathode pole piece, the anode polarity can be led out of the housing assembly 10 through the first adapter 211, and at the same time, the first housing 11 is rendered Cathode polarity. In another embodiment, when the first pole piece 21 and the second pole piece 22 are respectively a cathode pole piece and an anode pole piece, the cathode polarity can be led out of the housing assembly 10 through the first adapter 211, and the A housing 11 has an anode polarity.

Wherein, since the first housing 11 has a cathode polarity or an anode polarity, in order to prevent the first adapter 211 from contacting and short-circuiting the first housing 11, a space between the first adapter 211 and the first housing 11 may be provided. There is insulating glue (not shown). For example, the outer circumference of the first adapter 211 may be covered with insulating glue.

Please refer to FIG. 9 and FIG. 10, yet another embodiment of the present application further provides a battery 300. In the battery 300, the second tab 220 is electrically connected to the first housing 11 through the second adapter 221. The difference from the battery 200 described above is that the second housing 12 of the battery 300 is provided with a through hole 1201 penetrating the metal layer 120 and the connection layer 121. The housing assembly 10 is provided with a conductive member 13, the conductive member 13 covers the through hole 1201, and the first tab 210 is electrically connected to the conductive member 13.

Wherein, the first tab 210 can be electrically connected to the conductive member 13 through the first adapter member 210.

In the present application, a conductive member 13 is provided in the housing assembly 10 and the first tab 210 is electrically connected to the conductive member 13. Therefore, after the external electrical connection member is connected to the conductive member 13, the polarity of the first tab 210 can be made The housing assembly 10 is drawn out. Therefore, the second housing 12 also does not need to be provided with a pole, and since the pole and the corresponding insulating backing plate are omitted, it is beneficial to reduce the thickness of the housing assembly 10 and increase the energy density of the battery 100. Furthermore, since the conductive member 13 covers the through hole 1201, the battery core 20 can be sealed in the housing assembly 10.

Wherein, the conductive member 13 can be connected to the connection layer 121 through a welding process. The material of the conductive member 13 may be metal. For example, the material of the conductive member 13 may be steel alloy, aluminum alloy, iron alloy, copper alloy, nickel alloy, or the like. Optionally, the material of the conductive member 13 is iron-carbon alloy (ie, stainless steel) or aluminum.

The thickness of the conductive member 13 is 0.1mm-2mm, and can be optionally 0.15mm. Since the thickness of the conductive member 13 is relatively thin, it is beneficial to reduce the overall thickness of the battery 300.

Of course, in another embodiment, the second adapter 221 can also pass through the connection of the first housing 11 and the second housing 12 and be exposed to the housing assembly 10, so that the second tab 220 The electrical polarity is led out of the housing assembly 10.

Please refer to FIG. 11, yet another embodiment of the present application further provides a battery 400. The difference from the above-mentioned battery 100 is that the battery cell 20 is a wound battery cell, that is, the first pole piece 21, the isolation film, and the second pole piece 22 are wound to form the battery core 20.

Please refer to FIG. 12, this application also provides an electric device 1, and the electric device 1 includes the battery 100 (or the

battery

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

The above are only preferred embodiments of this application, and are not intended to limit this application. Any modification, equivalent replacement and improvement made within the spirit and principle of this application shall be included in the protection scope of this application. Inside.

Claims

A battery, characterized in that it comprises a casing assembly, the casing assembly comprising:

A first housing, the first housing being a rigid housing;

The second shell, the second shell is a flexible shell and covers the first shell, the second shell is provided with a connecting layer, and the second shell is fixed by the connecting layer. In the first housing, the connection layer includes an insulating material.
The battery according to claim 1, wherein the second casing further comprises a metal layer, and the metal layer is connected to the connection layer.
The battery according to claim 1, wherein the connection layer is bonded to the first casing, and the bonding force is greater than or equal to 7N/15mm.
The battery according to claim 1, wherein the melting temperature of the connecting layer is 150 degrees Celsius to 170 degrees Celsius.
The battery according to claim 2, wherein the metal layer includes at least one of aluminum, nickel, and stainless steel.
The battery according to claim 1, wherein the insulating material includes polypropylene, polyurethane, polystyrene, polyethylene, polyimide, polyethylene terephthalate, polycarbonate, poly At least one of vinyl chloride, foamed polypropylene, polyamide, rubber or silica gel.
The battery according to claim 2, wherein the second casing further comprises a protective layer, the metal layer is located between the protective layer and the connection layer, and the protective layer comprises nylon and polychloride. At least one of ethylene.
The battery according to claim 2, wherein the thickness of the metal layer is 0.01 mm to 3 mm.
The battery according to claim 1, wherein the first casing comprises at least one of steel alloy, aluminum alloy, iron alloy, copper alloy, nickel alloy, ceramic, carbon fiber, or rigid plastic.
The battery according to any one of claims 1 to 9, further comprising a battery cell, the battery cell is housed in the housing assembly, and the battery cell includes a first pole piece and a first pole piece. Two pole pieces, the first pole piece and the second pole piece are laminated or wound to form the battery, and the battery further includes a first lug electrically connected to the first pole piece.
The battery according to claim 10, wherein the battery cell further comprises a first adapter piece electrically connected to the first tab, and the first adapter piece passes through the first housing and the second The connection part of the shell penetrates and is exposed to the shell assembly.
The battery according to claim 11, wherein the battery cell further comprises a second tab with a different polarity from the first tab and a second adapter electrically connected to the second tab , The second adapter piece passes through the joint of the first housing and the second housing and is exposed to the housing assembly.
The battery according to claim 12, wherein the projection of the first adapter on the second housing is between the projection of the second adapter on the second housing The angle of is greater than 0 degrees and less than 180 degrees.
The battery according to claim 11, wherein the battery cell further comprises a second tab with a polarity different from that of the first tab, and the second tab is electrically connected to the first housing .
The battery according to claim 10, wherein the second housing is provided with a through hole penetrating the metal layer and the connection layer, and the housing assembly is provided with a conductive element, and the conductive element Covering the through hole, the first tab is electrically connected to the conductive member.
The battery according to claim 15, wherein the battery cell further comprises a second tab with a polarity different from that of the first tab, and the second tab is electrically connected to the first shell body.
An electrical device, characterized in that the electrical device comprises the battery according to any one of claims 1 to 16.