WO2022067745A1

WO2022067745A1 - Battery and electronic device having said battery

Info

Publication number: WO2022067745A1
Application number: PCT/CN2020/119619
Authority: WO
Inventors: 马武; 张国文
Original assignee: 宁德新能源科技有限公司
Priority date: 2020-09-30
Filing date: 2020-09-30
Publication date: 2022-04-07
Also published as: CN113767494B; CN113767494A

Abstract

A battery, comprising an electrode assembly, a first electrode tab and a second electrode tab which are electrically connected to the electrode assembly, a first housing, a second housing and a third housing. The first housing is provided with an opening. The opening penetrates through the first housing. The first housing comprises an outer surface facing away from the opening. The second housing and the third housing are provided at two ends of the opening respectively, and are sleeved on the outer surface. The second housing and the third housing are electrically insulated from each other. The first housing, the second housing and the third housing together form an accommodation space for accommodating the electrode assembly, the first electrode tab and the second electrode tab. The first electrode tab is electrically connected to the second housing, and the second electrode tab is electrically connected to the third housing. The present application also provides an electronic device having said battery.

Description

Battery and electronic device having the same

technical field

The present application relates to the field of electrochemistry, in particular to batteries and electronic devices having the batteries.

Background technique

With the rapid development of science and technology, the functional demands of consumers for electronic products in daily life are also increasing rapidly, so this puts forward more and more stringent requirements for batteries as the power source of electronic products. At present, a general battery adopts two metal casings (hereinafter referred to as a first casing and a second casing) and a sealing ring to be packaged together as an outer casing structure of the battery. Among them, the first case is used to load the battery cell and is electrically connected to the positive electrode ear of the battery cell; the second case is electrically connected to the negative electrode ear of the battery cell, so the first case presents the positive electrode, and the second case presents the positive electrode. negative electrode. However, there are the following problems: (1) Since the entire shell structure of the battery is polarized, the battery has a greater risk of short circuit; (2) Since the entire shell structure of the battery is polarized, the battery cell and all The non-connected areas of the casing structure need to be insulated with rubber, which leads to the loss of battery energy density and the increase of battery manufacturing cost.

SUMMARY OF THE INVENTION

In view of this, it is necessary to provide a battery to reduce the risk of battery short circuit.

The present application also provides an electronic device having the battery.

A battery includes an electrode assembly, a first tab and a second tab electrically connecting the electrode assembly, a first case, a second case and a third case. The first casing is provided with an opening. The opening penetrates the first casing. The first housing includes an outer surface facing away from the aperture. The second shell and the third shell are respectively disposed at both ends of the opening and sleeved on the outer surface. The second casing and the third casing are electrically insulated. The first case, the second case and the third case together form a receiving space for receiving the electrode assembly, the first tab and the second tab. The first tab is electrically connected to the second housing, and the second tab is electrically connected to the third housing.

In a possible implementation manner, the battery further includes a first sealing member and a second sealing member, the first sealing member is disposed between the first casing and the second casing, and the first sealing member is disposed between the first casing and the second casing. Two seals are arranged between the first casing and the third casing.

In a possible implementation manner, the first sealing member and the second sealing member are both heat shrinkable materials.

In a possible implementation manner, the first housing further includes a first protruding part, the first protruding part is protruded on the outer surface and located on the second housing and the third between the shells.

In a possible implementation manner, the first housing further includes a second protruding portion and a third protruding portion respectively located on both sides of the first protruding portion, and the second housing includes a a first side plate opposite to the outer surface, the third housing includes a second side plate opposite to the outer surface, and the second protruding portion is provided between the outer surface and the first side plate , the third protruding part is arranged between the outer surface and the second side plate.

In a possible implementation manner, the second casing further includes a first extension plate and a first connecting plate, and the first extension plate extends from one end of the first side plate toward the third casing , and the second protruding portion is in contact with the first extension plate, the first connecting plate is connected to the end of the first extension plate away from the first side plate, and abuts on the outer surface , the third shell further includes a second extension plate and a second connecting plate, the second extension plate extends from the second side plate toward one end of the second shell, and the third convex The outgoing part abuts against the second extension plate, and the second connection plate is connected to an end of the second extension plate away from the first side plate, and abuts against the outer surface.

In a possible implementation manner, the cross-sectional shape of the second protruding portion and the third protruding portion is a rectangle, a trapezoid, a semi-ellipse, or a triangle.

In a possible implementation manner, the first housing further includes a second protruding portion and a third protruding portion, and the second protruding portion is disposed between the outer surface and the second housing , the third protruding part is arranged between the outer surface and the third housing.

In a possible implementation, the outer surface of the first casing is electrically insulated.

In a possible implementation manner, the material of the first casing is an insulating material or a first composite material, and the first composite material is a structure in which an insulating layer is sandwiched with a conductive layer;

The material of the second shell and/or the third shell is a conductive material or a second composite material, and the second composite material is a structure in which an insulating layer is sandwiched between a conductive layer. It should be noted that, according to the specific electrification situation, when the second composite material is selected for the second shell and the third shell, the selected conductive layers may be different.

In a possible implementation manner, the insulating material is liquid crystal polymer, p-hydroxybenzaldehyde, polyethylene terephthalate, polyvinyl chloride, polyimide and acrylonitrile-butadiene-styrene At least one of the copolymers, and the conductive material is at least one of stainless steel, aluminum alloy, copper alloy and nickel alloy.

In a possible implementation manner, the electrode assembly includes a first pole piece, a second pole piece, and a diaphragm between the first pole piece and the second pole piece, the first pole piece, the second pole piece, and the The separator and the second pole piece are laminated or wound to form the electrode assembly.

An electronic device, comprising the battery described in any one of the above.

In the battery of the present application, the second casing and the third casing are respectively disposed at both ends of the opening, and sleeved on the outer surface of the first casing, so as to use the first casing The housing is arranged so that there is no electronic conduction channel between the second housing and the third housing, thereby effectively reducing the risk of short circuit.

Description of drawings

FIG. 1 is a plan view of a battery according to an embodiment of the present application.

FIG. 2 is a schematic cross-sectional view along the line II-II shown in FIG. 1 .

FIG. 3 is an exploded schematic view of the battery shown in FIG. 1 .

4A is a schematic cross-sectional view of a battery according to another embodiment of the present application.

FIG. 4B is a schematic cross-sectional view of the IV portion shown in FIG. 4A .

FIG. 5 is an exploded schematic view of the battery shown in FIG. 4A .

FIG. 6 is a schematic cross-sectional view of a battery according to still another embodiment of the present application.

FIG. 7 is a schematic cross-sectional view of a battery according to another embodiment of the present application.

FIG. 8 is an exploded schematic view of the battery shown in FIG. 7 .

FIG. 9 is a schematic cross-sectional view of a battery according to another embodiment of the present application.

FIG. 10 is a schematic cross-sectional view of a battery according to still another embodiment of the present application.

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

FIG. 12 is a partial cross-sectional schematic diagram of a battery according to still another embodiment of the present application.

FIG. 13 is a partial cross-sectional schematic diagram of a battery according to still another embodiment of the present application.

FIG. 14 is a schematic cross-sectional view of a battery according to still another embodiment of the present application.

FIG. 15 is a top view of a battery according to another embodiment of the present application.

FIG. 16 is a plan view of a battery according to still another embodiment of the present application.

FIG. 17 is a schematic block diagram of an electronic device according to an embodiment of the present application.

Description of main component symbols

battery 10

Electrode assembly 11

The first pole piece 111

Diaphragm 112

Second pole piece 113

first polar ear 12

second tab 13

first shell 14

Opening 141

outer surface 142

The first protrusion 143

The second protrusion 144

The third protrusion 145

second shell 15

first side plate 151

The first floor 152

The first extension plate 153

The first connection board 154

The first accommodation space 155

The third shell 16

Second side panel 161

Second blade 162

The second extension plate 163

The second connection board 164

The second accommodation space 165

Containment space 17

first seal 18

The first sealing part 181

The first hook 182

Second seal 19

The second sealing part 191

The second hook 192

Electronic device 1

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 clearly and completely 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, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

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.

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

Referring to FIG. 1 , an embodiment of the present application provides a battery 10 . 2 and 3 together, the battery 10 includes an electrode assembly 11 , a first tab 12 and a second tab 13 electrically connected to the electrode assembly 11 , a first casing 14 , and a second casing 15 and the third housing 16 . The first casing 14 is provided with an opening 141 . The opening 141 penetrates the first casing 14 . The first housing 14 includes an outer surface 142 facing away from the opening 141 . The second casing 15 and the third casing 16 are respectively disposed at both ends of the opening 141 and sleeved on the outer surface 142. The second casing 15 and the third casing 16 are electrically insulated. The first casing 14 , the second casing 15 and the third casing 16 together form a receiving space for accommodating the electrode assembly 11 , the first tab 12 and the second tab 13 17. The first tab 12 is electrically connected to the second shell 15 . The second tab 13 is electrically connected to the third shell 16 .

In the battery 10 of the present application, the second casing 15 and the third casing 16 are respectively disposed at both ends of the opening 141 and sleeved on the outer surface 142 of the first casing 14 . By virtue of the arrangement of the first housing 14, there is no electronic conduction channel between the second housing 15 and the third housing 16, thereby effectively reducing the risk of short circuit.

In some embodiments, the material of the first casing 14 is an insulating material, and the material of the second casing 15 and the material of the third casing 16 are conductive materials or composite materials. The composite material includes insulating material and conductive material.

Wherein, the insulating material is at least one of liquid crystal polymer, p-hydroxybenzaldehyde, polyethylene terephthalate, polyvinyl chloride, polyimide and acrylonitrile-butadiene-styrene copolymer kind. The conductive material is at least one of stainless steel, aluminum alloy, copper alloy and nickel alloy.

According to an embodiment of the present application, the material of the first casing 14 is a first composite material, and the first composite material is a structure in which an insulating layer is sandwiched with a conductive layer. According to another embodiment of the present application, the material of the second casing 15 is a second composite material, and the second composite material is a structure in which an insulating layer is sandwiched between a conductive layer; correspondingly, the material of the third casing 16 can also be The second composite material, the second composite material referred to here is a material structure different from the above-mentioned first composite material. According to the embodiment of the present application, in the second composite material of the second casing 15 and the third casing 16 , the conductive layers of the two can use different conductive materials according to their charging characteristics.

In another embodiment, the material of the first casing 14 is a composite material, and the material of the second casing 15 and the material of the third casing 16 are conductive materials or composite materials. The material of the part of the first casing 14 in contact with the second casing 15 and the third casing 16 is an insulating material, and the material of the rest of the second casing 15 is a conductive material or composite materials. At least part of the second shell 15 that is electrically connected to the first tab 12 is made of conductive material, and the rest of the second shell 15 is made of insulating material, conductive material or composite material, which is compatible with all the materials. At least part of the third shell 16 to which the second tab 13 is electrically connected is made of conductive material, and the rest of the second shell 15 is made of insulating material, conductive material or composite material.

In still other embodiments, the material of the first casing 14 is a composite material, and the material of the second casing 15 and the material of the third casing 16 are conductive materials or composite materials. The material of the part of the first casing 14 in contact with the second casing 15 and the third casing 16 is a conductive material, and the material of the rest of the second casing 15 is an insulating material or Composite material, the parts of the second shell 15 and the third shell 16 in contact with the first shell 14 are made of insulating material, the second shell 15 and the third shell The rest of 16 is made of conductive material or composite material.

In some embodiments, the first tab 12 and the second shell 15 are electrically connected by laser welding, resistance welding, or ultrasonic welding. The second tab 13 and the third shell 16 are electrically connected by laser welding, resistance welding, or ultrasonic welding.

It can be understood that the battery 10 further includes an electrolyte (not shown) accommodated in the accommodating space 17 .

In some embodiments, referring to FIGS. 2 and 3 , the electrode assembly 11 is completely accommodated in the opening 141 , that is, the first casing 14 is an annular wall structure, which is arranged around the electrode assembly 11 or the first The casing 14 includes substantially parallel upper and lower surfaces, and the opening 141 penetrates the upper and lower surfaces. Wherein, compared with the existing battery, the non-connecting area between the battery cell and the outer shell structure needs to be covered with insulation because the entire outer shell structure is polarized, the battery 10 in the present application uses the electrode assembly 11 is accommodated in the opening 141 of the first shell 14, because between the first shell 14 and the second shell 15, and between the first shell 14 and the third shell Due to the electrical insulating properties between the bodies 16, the electrode assembly 11 will not cause a short circuit problem in the battery 10 even if the electrode assembly 11 is in contact with the first case 14. Therefore, the battery 10 in the present application does not need to perform additional operations on the electrode assembly 11. The encapsulation insulation treatment improves the energy density of the battery 10 and reduces the manufacturing cost of the battery 10 .

In some embodiments, referring to FIGS. 4A , 4B and 5 , the battery 10 further includes a first seal 18 and a second seal 19 . The first seal 18 is disposed between the first casing 14 and the second casing 15 . The second seal 19 is provided between the first housing 14 and the third housing 16. In this way, through the arrangement of the first sealing member 18 and the second sealing member 19, the space between the second casing 15 and the first casing 14, and the third casing 16 and the An interference seal is formed between the first casings 14 , thereby effectively preventing impurities such as external water vapor from entering the battery 10 and effectively preventing the battery 10 from leaking.

Wherein, the first sealing member 18 and the second sealing member 19 are both heat shrinkable materials. The heat shrinkable material is not limited to one or more of polypropylene, polyamide, fluororubber, polyester resin, fusible polytetrafluoroethylene, polyimide, polyphenylene ether and fluorinated ethylene propylene copolymer .

In some embodiments, referring to FIG. 6 , the first housing 14 further includes a first protrusion 143 . The first protruding portion 143 protrudes from the outer surface 142 and is located between the second casing 15 and the third casing 16 . Wherein, the arrangement of the first protruding portion 143 is used to strengthen the strength of the first casing 14 . In addition, the arrangement of the first protruding part 143 can also be used to space the second casing 15 and the third casing 16 to avoid contact between the second casing 15 and the third casing 16 short circuit occurs.

In a further embodiment, referring to FIGS. 7 and 8 , the first housing 14 further includes a second protruding portion 144 and a third protruding portion 145 respectively located on both sides of the first protruding portion 143 . The second housing 15 includes a first side plate 151 opposite to the outer surface 142 . The third housing 16 includes a second side plate 161 opposite to the outer surface 142 . The second protruding portion 144 is disposed between the outer surface 142 and the first side plate 151 . The third protruding portion 145 is disposed between the outer surface 142 and the second side plate 161 . It can be understood that, in other embodiments, referring to FIG. 10 , the first protruding portion 143 may be omitted. In this way, the outer surface 142 is only provided with the second protruding portion 144 and the third protruding portion 145 .

In other embodiments, referring to FIG. 9 , the second housing 15 further includes a first extension plate 153 and a first connecting plate 154 . The first extension plate 153 extends from the first side plate 151 toward one end of the second side plate 161 , and the second protruding portion 144 abuts against the first extension plate 153 . The first connecting plate 154 is connected to an end of the first extension plate 153 away from the first side plate 151 and abuts against the outer surface 142 . The third housing 16 further includes a second extending plate 163 and a second connecting plate 164 . The second extension plate 163 extends from the second side plate 161 toward one end of the first side plate 151 , and the third protruding portion 145 abuts against the second extension plate 163 . The second connecting plate 164 is connected to an end of the second extending plate 163 away from the second side plate 161 and abuts against the outer surface 142 . It can be understood that the position of the second housing 15 is limited by the cooperation of the second protruding portion 144 with the first extension plate 153 and the first connecting plate 154, thereby effectively preventing the second After the casing 15 is assembled to the first casing 14, there is a problem of outward sliding. Similarly, the position of the third housing 16 is limited by the cooperation of the third protruding portion 145 with the second extension plate 163 and the second connecting plate 164, thereby effectively preventing the third The casing 16 has a problem of sliding outward after being assembled to the first casing 14 .

Wherein, the longitudinal cross-sectional shape of the second protruding portion 144 is not limited to a rectangle, a trapezoid, a semi-ellipse, or a triangle. The longitudinal cross-sectional shape of the third protruding portion 145 is not limited to a rectangle, a trapezoid, a semi-ellipse, or a triangle.

In some embodiments, referring to FIG. 2 , the electrode assembly 11 includes a first pole piece 111 , a separator 112 and a second pole piece 113 . The diaphragm 112 is located between the first pole piece 111 and the second pole piece 113 . The first pole piece 111 , the separator 112 and the second pole piece 113 are wound to form the electrode assembly 11 . In other embodiments, the first pole piece 111 , the separator 112 and the second pole piece 113 may be laminated to form the electrode assembly 11 .

Hereinafter, the battery 10 of the present application will be specifically described by means of embodiments.

Example 1

1 , 2 and 3 , a battery 10 includes an electrode assembly 11 , a first tab 12 and a second tab 13 electrically connected to the electrode assembly 11 , a first case 14 , and a second case 15 and the third housing 16 .

Referring to FIG. 3 , the first casing 14 is provided with an opening 141 . The opening 141 penetrates the first casing 14 . In Embodiment 1, the opening 141 is circular. The cross section of the first casing 14 is circular. In other embodiments, the shape of the opening 141 may also be a regular shape such as an ellipse, a polygon, or other irregular shapes. The cross section of the first shell 14 may also be in a regular shape such as an ellipse, a polygon, or other irregular shapes. Wherein, the polygon is not limited to a triangle, a quadrilateral, and the like.

Referring to FIGS. 2 and 3 , the first housing 14 includes an outer surface 142 facing away from the opening 141 . The second shell 15 and the third shell 16 are respectively disposed on both ends of the opening 141 and sleeved on the outer surface 142. In this way, the first case 14 , the second case 15 and the third case 16 together form a space for accommodating the electrode assembly 11 , the first tab 12 and the second tab 13 . Containment space 17. It can be understood that the battery 10 further includes an electrolyte (not shown) accommodated in the accommodating space 17 .

Specifically, in Embodiment 1, referring to FIGS. 2 and 3 , the second housing 15 includes a first side plate 151 and a first bottom plate 152 . The first side plate 151 is disposed around the periphery of the first bottom plate 152 to form a first accommodating space 155 together with the first bottom plate 152 . The third casing 16 includes a second side plate 161 and a second bottom plate 162 . The second side plate 161 is disposed around the periphery of the second bottom plate 162 to form a second accommodating space 165 together with the second bottom plate 162 . In this way, one end of the first casing 14 with the opening 141 is accommodated in the first accommodating space 155 , and the other end of the first casing 14 with the opening 141 is accommodated in the second accommodating space 155 . Accommodating space 165. The second casing 15 and the first casing 14 are in an interference fit, and the third casing 16 and the first casing 14 are in an interference fit. Then, one end of the first casing 14 with the opening 141 is accommodated in the first accommodating space 155, and the other end of the first casing 14 with the opening 141 is accommodated in the first accommodating space 155. After two accommodating spaces 165 , the first side plate 151 directly abuts against the outer surface 142 of the first casing 14 , and the second side plate 161 directly abuts against the outer surface 142 of the first casing 14 . The outer surface 142 is formed so that the second casing 15 and the third casing 16 are sealed and connected to the first casing 14 respectively, so that impurities such as external water vapor can be effectively prevented from entering the battery 10 and can effectively prevent Battery 10 is leaking.

In Embodiment 1, the second casing 15 and the third casing 16 are respectively sealed to the first casing 14 through a press-fitting process.

In Embodiment 1, referring to FIG. 3 , the shapes of the first bottom plate 152 and the second bottom plate 162 are both circular. It can be understood that, in other embodiments, referring to FIGS. 15 and 16 , the shapes of the first bottom plate 152 and the second bottom plate 162 can be adaptively adjusted according to the shape of the cross-section of the first housing 14 , It can also be a regular shape such as an ellipse, a polygon, or other irregular shapes. Wherein, the polygon is not limited to a triangle, a quadrilateral, and the like.

In Embodiment 1, referring to FIGS. 2 and 3 , the electrode assembly 11 is completely accommodated in the opening 141 . Wherein, compared with the existing battery, the non-connecting area between the cell and the casing structure needs to be covered with plastic because the entire casing structure is polarized. The battery 10 in this embodiment 1 uses the The design of the electrode assembly 11 being accommodated in the opening 141 of the first casing 14 is due to the gap between the first casing 14 and the second casing 15, and between the first casing 14 and the second casing 14. Due to the electrical insulating properties between the three casings 16, even if the electrode assembly 11 is in contact with the first casing 14, the battery 10 will not be short-circuited, so the battery 10 in this embodiment 1 does not need a counter electrode assembly 11 performs additional encapsulation and insulation treatment, so that the energy density of the battery 10 is increased, and the manufacturing cost of the battery 10 is also reduced.

Referring to FIG. 2 , the electrode assembly 11 includes a first pole piece 111 , a diaphragm 112 and a second pole piece 113 . The diaphragm 112 is located between the first pole piece 111 and the second pole piece 113 . The first pole piece 111 , the separator 112 and the second pole piece 113 are wound to form the electrode assembly 11 . The first pole piece 111 is electrically connected to the first pole tab 12 , and the second pole piece 113 is electrically connected to the second pole tab 13 .

The material of the second casing 15 and the material of the third casing 16 are conductive materials or composite materials. The composite material includes conductive material and insulating material. Wherein, the insulating material is at least one of liquid crystal polymer, p-hydroxybenzaldehyde, polyethylene terephthalate, polyvinyl chloride, polyimide and acrylonitrile-butadiene-styrene copolymer kind. The conductive material is at least one of stainless steel, aluminum alloy, copper alloy and nickel alloy.

In Embodiment 1, the material of the second casing 15 and the material of the third casing 16 are both conductive materials. At this time, the first tab 12 is electrically connected to the first bottom plate 152 of the second casing 15 , and the second tab 13 is electrically connected to the second bottom plate 162 of the third casing 16 . In this way, the second case 15 and the third case 16 will be used as the external electrical connection terminals of the battery 10 respectively, so as to connect the first pole piece 111 and the second pole piece in the electrode assembly 11 . The polarity of 113 is drawn out via the second housing 15 and the third housing 16 .

In some embodiments, the material of the second casing 15 is a composite material, and the material of the third casing 16 is a conductive material. Wherein, part of the first bottom plate 152 is made of conductive material, the rest of the first bottom plate 152 is made of insulating material or composite material, and the first side plate 151 is made of conductive material, insulating material or composite material. At this time, the first tab 12 is electrically connected to the region of the first base plate 152 made of conductive material, and the second tab 13 is electrically connected to the second base plate 162 .

In other embodiments, the material of the second casing 15 is a conductive material, and the material of the third casing 16 is a composite material. A part of the second bottom plate 162 is made of conductive material, the rest of the second bottom plate 162 is made of insulating material or composite material, and the second side plate 161 is made of conductive material, insulating material or composite material. At this time, the first tabs 12 are electrically connected to the first base plate 152 , and the second tabs 13 are electrically connected to regions of the second base plate 162 made of conductive materials.

In still other embodiments, the material of the second casing 15 and the material of the second casing 16 are both composite materials. Wherein, part of the first bottom plate 152 is made of conductive material, the rest of the first bottom plate 152 is made of insulating material or composite material, and the first side plate 151 is made of conductive material, insulating material or composite material. Part of the second bottom plate 162 is made of conductive material, the rest of the second bottom plate 162 is made of insulating material or composite material, and the second side plate 161 is made of conductive material, insulating material or composite material. At this time, the first tab 12 is electrically connected to the area made of conductive material in the first base plate 152 , and the second tab 13 is electrically connected to the area made of conductive material in the second base plate 162 .

In Embodiment 1, when the material of the second casing 15 and the material of the third casing 16 are conductive materials, both the second casing 15 and the third casing 16 can be punched Process formed. It can be understood that the angle between the first side plate 151 and the first bottom plate 152 is not less than 90°, which facilitates the stamping and demolding of the second shell 15 and facilitates the assembly of the second shell 15 to the first housing 14 . Similarly, the angle between the second side plate 161 and the second bottom plate 162 is not less than 90°, which facilitates the stamping and demolding of the third shell 15 and facilitates the assembly of the third shell 15 to the first housing 14 .

In Embodiment 1, the material of the first casing 14 is an insulating material. Wherein, the first shell 14 can be prepared by an injection molding process.

In some embodiments, the material of the first casing 14 is a composite material. Wherein, on the premise of ensuring electrical insulation between the first casing 14 and the second casing 15 and between the first casing 14 and the third casing 16, the first casing A shell 14 is not limited to a composite structure with an inner layer of insulating material and an outer layer of a conductive material, a composite structure with an outer layer of an insulating material and an inner layer of a conductive material, a composite structure with an insulating material in the upper part and a lower part and a conductive material in the middle The structure and the composite structure in which the upper and lower parts are conductive material and the middle part is insulating material. The outer layer is the area where the outer surface 142 is located, and the inner layer is the first shell 14 facing away from the rest of the outer layer. The upper part is a part of the first housing 14 connected to the second housing 15, the lower part is a part of the first housing 14 connected to the third housing 16, and the middle part is connected to the upper part and the The part of the first casing 14 between the lower parts.

In Embodiment 1, the second shell 15 and the third shell 16 sleeved on the outer surface 142 of the first shell 14 are spaced apart to avoid the second shell 15 A short circuit occurs due to contact with the third casing 16 .

The manufacturing process of the battery 10 will be briefly described below.

Step 1: Place the first housing 14 on a platform fixture (not shown) for fixing.

Step 2: Place the second shell 15 corresponding to the right above the first shell 14, and press the second shell 15 to sleeve the second shell 15 on the first shell 15. An outer surface 142 of the housing 14 .

Step 3: Place the electrode assembly 11 in the assembled first casing 14 and the second casing 15, and press the electrode assembly 11 with the help of a pressing block (not shown), so that the first A tab 12 is tightly pressed against the first bottom plate 152 of the second housing 15 .

Step 4: Connect the first tab 12 and the first bottom plate 152 together by means of laser welding. Wherein, the surface of the first bottom plate 152 is flat to ensure the reliability of the welding of the first tab 12 and the first bottom plate 152 .

Step 5: Place the third shell 16 on the lower fixing fixture (not shown), then bend the second tab 13 to the second bottom plate 162 of the third shell 16, and press the block (not shown) to press the second tab 13 and the second bottom plate 162 tightly;

Step 6: Connect the second tab 13 and the second bottom plate 162 together by means of laser welding. Wherein, the surface of the second bottom plate 162 is flat to ensure the reliability of the welding of the second tab 13 and the second bottom plate 162 .

Step 7: Place the third casing 16 corresponding to the right above the first casing 14, and press the third casing 16 to sleeve the third casing 16 on the first casing 14. An outer surface 142 of the housing 14 . The second shell 15 and the first shell 14 are in an interference fit, and the third shell 16 and the first shell 14 are in an interference fit, so that the second shell 15 and the first shell 14 are in an interference fit. The third casings 16 are respectively connected with the first casings 14 in a sealed manner.

Example 2

The difference between Embodiment 2 and Embodiment 1 is that the battery 10 in Embodiment 2 further includes a first sealing member 18 and a second sealing member 19 .

In Embodiment 2, referring to FIGS. 4A , 4B and 5 , the first sealing member 18 is provided between the first casing 14 and the second casing 15 . The second seal 19 is disposed between the first casing 14 and the third casing 16 . The second casing 15 and the first casing 14 are respectively in interference fit with the first sealing member 18 , and the third casing 16 and the first casing 14 are respectively fitted with the first sealing member 18 . The two seals 19 have an interference fit.

It can be understood that the size of the burr on the surface of the second shell 15 and the surface of the third shell 16 needs to be controlled to be no more than 0.01 mm, so as to prevent the burr from scratching the first sealing member 18 and/or the second sealing part 19 and causing leakage liquid channel. In addition, the transition of the first shell 14, for example, the transition between the side surface and the end surface of the first shell 14, adopts an R-angle transition, so as to facilitate the first density member 18 and all the The second sealing member 19 is assembled to the first casing 14 , and at the same time, the electrode assembly 11 can be prevented from being scratched when the first casing 14 and the electrode assembly 11 are assembled. Wherein, the distance between the side surface and the end surface of the first casing 14 is not less than 90°, which facilitates the assembly of the first density member 18 and the second sealing member 19 to the first casing 14 .

Specifically, referring to FIGS. 4B and 5 , the first sealing member 18 includes a first sealing portion 181 and a first hook portion 182 . The first sealing portion 181 is disposed between the outer surface 142 and the first side plate 151 . The first hook portion 182 extends from an end of the first sealing portion 181 away from the third housing 16 and is bent toward the opening 141 . The second sealing member 19 includes a second sealing portion 191 and a second hook portion 192 . The second sealing portion 191 is disposed between the outer surface 142 and the second side plate 161 . The second hook portion 192 extends from an end of the second sealing portion 191 away from the second housing 15 and is bent toward the opening 141 .

It can be understood that in the process of fitting the second casing 15 to the first casing 14, the second casing 15 will continuously press the first sealing member 18, resulting in the first The sealing member 18 moves in the direction of the third housing 16 and falls off, and the first hook portion 182 is arranged so that the first sealing member 18 hooks one end of the first housing 14 , thereby The problem of falling off of the first sealing member 18 due to the pressing of the first sealing member 18 by the second casing 15 is effectively avoided. Similarly, in the process of fitting the third casing 16 to the first casing 14, the third casing 16 will continuously press the second sealing member 19, causing the second The sealing member 19 moves toward the second housing 15 and falls off, and the second hook portion 192 is arranged so that the second sealing member 19 hooks the other end of the first housing 14, Therefore, the problem of the second sealing member 19 falling off due to the pressing of the second sealing member 19 by the third casing 16 is effectively avoided.

In Embodiment 1, the connection between the first sealing member 18 and the first housing 14 and the connection between the second sealing member 19 and the first housing 14 can also be EDM is performed to further improve the sealing performance between the first seal 18 and the first housing 14 and between the second seal 19 and the first housing 14 .

In Embodiment 1, both the first sealing member 18 and the second sealing member 19 are integrally formed.

In another embodiment, an end of the first sealing portion 181 away from the first hook portion 182 and an end of the second sealing portion 191 away from the second hook portion 192 are connected together. At this time, the first sealing member 18 and the second sealing member 19 together form an integral structure.

In another embodiment, the first hook portion 182 and the second hook portion 192 may be omitted. That is, the first sealing member 18 includes only the first sealing portion 181 , and the second sealing member 19 includes only the second sealing portion 191 .

In Embodiment 2, the cross-sectional shapes of the first sealing member 18 and the second sealing member 19 are both circular. It can be understood that in other embodiments, the shapes of the cross-sections of the first sealing member 18 and the second sealing member 19 may be adaptively adjusted according to the shapes of the cross-sections of the first housing 14 , or Are regular shapes such as ellipses, polygons, or other irregular shapes.

Wherein, the first sealing member 18 and the second sealing member 19 are not limited to form a tight connection with the first housing 14 by means of mechanical fitting, injection molding, heat shrinking, and the like.

Example 3

The difference between Embodiment 3 and Embodiment 2 is that the first housing 14 in Embodiment 3 further includes a first protruding portion 143 protruding from the outer surface 142 .

In Embodiment 3, referring to FIG. 6 , the first protruding portion 143 is arranged around the outer surface 142 . Wherein, the second casing 15 and the third casing 16 are disposed on both sides of the first protruding portion 143, respectively.

In Embodiment 3, the longitudinal section of the first protruding portion 143 is rectangular. In other embodiments, the shape of the longitudinal section of the first protruding portion 143 is not limited to a regular shape such as a semi-ellipse or other irregular shapes.

Example 4

The difference between Embodiment 4 and Embodiment 3 is that the first housing 14 in Embodiment 4 further includes a second protruding portion 144 and a third protruding portion 145 protruding from the outer surface 142 .

In Embodiment 4, referring to FIGS. 7 and 8 , the second protruding portion 144 and the third protruding portion 145 are annularly disposed on the outer surface 142 . The second protruding portion 144 is disposed between the first side plate 151 and the outer surface 142 and between the first sealing member 18 and the first protruding portion 143 . The third protruding portion 145 is disposed between the second side plate 161 and the outer surface 142 , and between the second sealing portion 191 and the first protruding portion 143 .

It can be understood that the arrangement of the second protruding portion 144 can be used to define the position of the first sealing member 18 , and the arrangement of the third protruding portion 145 can be used to define the location of the second sealing portion 191 .

In Embodiment 4, referring to FIG. 7 , the longitudinal sections of the second protruding portion 144 and the third protruding portion 145 are elliptical. It can be understood that, in other embodiments, referring to FIGS. 12 and 13 , the longitudinal cross-sectional shape of the second protruding portion 144 is not limited to a rectangle or a trapezoid. The longitudinal cross-sectional shape of the third protruding portion 145 is not limited to a rectangle or a trapezoid.

Example 5

The difference between Embodiment 5 and Embodiment 4 lies in the structures of the second casing 15 and the third casing 16 .

In Embodiment 5, referring to FIG. 9 , the second housing 15 further includes a first extending plate 153 and a first connecting plate 154 . The first extension plate 153 extends from the first side plate 151 toward one end of the second side plate 161 , and the second protruding portion 144 abuts against the first extension plate 153 . The first connecting plate 154 is connected to an end of the first extension plate 153 away from the first side plate 151 and abuts against the outer surface 142 . The third housing 16 further includes a second extending plate 163 and a second connecting plate 164 . The second extension plate 163 extends from the second side plate 161 toward one end of the first side plate 151 , and the third protruding portion 145 abuts against the second extension plate 163 . The second connecting plate 164 is connected to an end of the second extending plate 163 away from the second side plate 161 and abuts against the outer surface 142 .

It can be understood that the position of the second housing 15 is limited by the cooperation of the second protruding portion 144 with the first extension plate 153 and the first connecting plate 154, thereby effectively preventing the second After the casing 15 is assembled to the first casing 14, there is a problem of outward sliding. Similarly, the position of the third housing 16 is limited by the cooperation of the third protruding portion 145 with the second extension plate 163 and the second connecting plate 164, thereby effectively preventing the third The casing 16 has a problem of sliding outward after being assembled to the first casing 14 .

Example 6

The difference between Embodiment 6 and Embodiment 2 is that the first housing 14 in Embodiment 6 further includes a second protruding portion 144 and a third protruding portion 145 protruding from the outer surface 142 .

In Embodiment 6, referring to FIG. 10 , the second protruding portion 144 and the third protruding portion 145 are annularly disposed on the outer surface 142 . The second protruding portion 144 is disposed between the first side plate 151 and the outer surface 142 . The third protruding portion 145 is disposed between the second side plate 161 and the outer surface 142 .

Example 7

The difference between Embodiment 7 and Embodiment 6 lies in the structures of the second casing 15 and the third casing 16 .

In Embodiment 7, referring to FIG. 11 , the second housing 15 further includes a first extending plate 153 and a first connecting plate 154 . The first extension plate 153 extends from the first side plate 151 toward one end of the second side plate 161 , and the second protruding portion 144 abuts against the first extension plate 153 . The first connecting plate 154 is connected to an end of the first extension plate 153 away from the first side plate 151 and abuts against the outer surface 142 . The third housing 16 further includes a second extending plate 163 and a second connecting plate 164 . The second extension plate 163 extends from the second side plate 161 toward one end of the first side plate 151 , and the third protruding portion 145 abuts against the second extension plate 163 . The second connecting plate 164 is connected to an end of the second extending plate 163 away from the second side plate 161 and abuts against the outer surface 142 .

Example 8

The difference between Embodiment 8 and Embodiment 1 is that the first housing 14 in Embodiment 8 further includes a first protruding portion 143 protruding from the outer surface 142 .

In Embodiment 8, referring to FIG. 14 , the first protruding portion 143 is annularly disposed on the outer surface 142 . Wherein, the second casing 15 and the third casing 16 are respectively disposed on both sides of the first protruding portion 143 .

In Embodiment 8, the longitudinal section of the first protruding portion 143 is rectangular. In other embodiments, the shape of the longitudinal section of the first protruding portion 143 is not limited to a regular shape such as a semi-ellipse or other irregular shapes.

Example 9

The difference between Example 9 and Example 4, Example 5, Example 6 or Example 7 is that the battery 10 in Example 9 does not have the first sealing member 18 and the second sealing member 19 .

In Example 9, the design of the battery 10 without the first sealing member 18 and the second sealing member 19 reduces the contact between the first sealing member 18 and the second sealing member 19 and the first casing 14 . assembly, so that the manufacturing cost of the battery 10 is greatly reduced, thereby effectively enhancing the product competitiveness of the battery 10 .

Referring to FIG. 17 , the present application further provides an electronic device 1 . The electronic device 1 includes the battery 10 described above. The electronic device 1 includes the battery 10 . The electronic device 1 may be a mobile electronic device, an energy storage device, an electric vehicle, a hybrid electric vehicle, or the like. The mobile electronic device may be a mobile phone, a wearable electronic device, a tablet computer, a notebook computer, and the like.

The above embodiments are only used to illustrate the technical solutions of the present application and not to limit them. Although the present application has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present application can be modified or equivalently replaced. , without departing from the spirit and essence of the technical solutions of the present application.

Claims

A battery, comprising an electrode assembly and a first tab and a second tab electrically connected to the electrode assembly, characterized in that the battery further comprises:

a first casing having an opening, the opening passing through the first casing, the first casing including an outer surface facing away from the opening; and

The second casing and the third casing are respectively disposed at both ends of the opening and sleeved on the outer surface, and the second casing and the third casing are electrically insulated;

The first shell, the second shell and the third shell together form a receiving space for accommodating the electrode assembly, the first tab and the second tab, and the first tab The tab is electrically connected to the second housing, and the second tab is electrically connected to the third housing.
The battery of claim 1, wherein the battery further comprises a first sealing member and a second sealing member, and the first sealing member is disposed between the first casing and the second casing and the second seal is arranged between the first casing and the third casing.
The battery of claim 2, wherein the first sealing member and the second sealing member are both heat shrinkable materials.
The battery according to any one of claims 1-3, wherein the first case further comprises a first protruding part, the first protruding part is protruded from the outer surface and located at the between the second casing and the third casing.
The battery of claim 4, wherein the first case further comprises a second protrusion and a third protrusion respectively located on both sides of the first protrusion, the second case The body includes a first side plate opposite the outer surface, the third housing includes a second side plate opposite the outer surface, and the second protrusion is provided on the outer surface and the first side plate. Between one side plate, the third protruding portion is arranged between the outer surface and the second side plate.
The battery according to claim 5, wherein the second case further comprises a first extension plate and a first connection plate, the first extension plate faces the third case from the first side plate One end of the body extends out, the second protruding portion abuts against the first extension plate, the first connecting plate is connected to an end of the first extension plate away from the first side plate, and abuts On the outer surface, the third shell further includes a second extension plate and a second connection plate, the second extension plate extends from the second side plate toward one end of the second shell, and The third protruding portion is in contact with the second extension plate, and the second connecting plate is connected to an end of the second extension plate away from the first side plate, and abuts against the outer surface.
The battery according to claim 5 or 6, wherein the cross-sectional shape of the second protruding portion and the third protruding portion is a rectangle, a trapezoid, a semi-ellipse, or a triangle.
The battery according to any one of claims 1-3, wherein the first case further comprises a second protruding part and a third protruding part, the second protruding part is provided on the Between the outer surface and the second housing, the third protruding portion is provided between the outer surface and the third housing.
The battery of claim 1, wherein the outer surface of the first casing is electrically insulating.
The battery of claim 1, wherein the material of the first casing is an insulating material or a first composite material, and the first composite material is a structure in which an insulating layer is sandwiched with a conductive layer; the second casing is made of an insulating material or a first composite material. The material of the casing and/or the third casing is a conductive material or a second composite material, and the second composite material is a structure in which an insulating layer is sandwiched between a conductive layer.
The battery according to claim 9 or 10, wherein the insulating material is liquid crystal polymer, p-hydroxybenzaldehyde, polyethylene terephthalate, polyvinyl chloride, polyimide and acrylonitrile -At least one of butadiene-styrene copolymer, the conductive material is at least one of stainless steel, aluminum alloy, copper alloy and nickel alloy.
The battery according to any one of claims 1-3, wherein the electrode assembly comprises a first pole piece, a second pole piece, and a second pole piece located between the first pole piece and the second pole piece The separator, the first pole piece, the separator and the second pole piece are laminated or wound to form the electrode assembly.
An electronic device, characterized in that, the electronic device comprises the battery according to any one of claims 1-12.