CN212676395U

CN212676395U - Battery and device using battery

Info

Publication number: CN212676395U
Application number: CN202021675907.5U
Authority: CN
Inventors: 陈远胜; 曾志龙; 李超鹏; 李春利
Original assignee: Dongguan Nvt Technology Co Ltd
Current assignee: Dongguan Nvt Technology Co Ltd
Priority date: 2020-08-12
Filing date: 2020-08-12
Publication date: 2021-03-09
Anticipated expiration: 2030-08-12

Abstract

The utility model provides a battery and device of using battery. The battery includes: the battery comprises a battery cell, a battery cover and a battery cover, wherein the battery cell comprises a main body part, a top sealing part connected with the main body part and a lug extending from the top sealing part; and the protection plate assembly comprises a protection plate and an insulation frame positioned on the outer side of the protection plate, and the protection plate is electrically connected to the tab. The battery further comprises a colloid, wherein at least part of the colloid is located between the main body part and the insulation frame and is connected with the main body part and the insulation frame.

Description

Battery and device using battery

Technical Field

The utility model relates to a battery field especially relates to a battery and device of using battery.

Background

Batteries such as lithium ion batteries are widely used in electronic devices such as mobile phones and notebook computers due to their advantages of high energy density, environmental friendliness, and the like. Lithium ion batteries have been widely used in the mobile phone market due to their high energy density, long cycle life, no memory effect, and other characteristics.

With the popularization of smart phones, the requirements on mobile phone batteries are higher and higher. The current battery has the major problems of failure of experiments such as falling, slight falling, rolling and the like, and the main failure modes are top seal opening, packaging bag breakage, tab breakage and the like. The primary cause of failure is the movement of the electrode assembly within the package and the rupture of the package or the top seal during a fall.

SUMMERY OF THE UTILITY MODEL

In view of the problems existing in the background art, the present invention is directed to a battery and a device using the battery, which can reduce the risk of cell rupture and improve the safety performance of the battery.

To achieve the above object, in some embodiments, the present invention provides a battery including: the battery comprises a battery cell, a battery cover and a battery cover, wherein the battery cell comprises a main body part, a top sealing part connected with the main body part and a lug extending from the top sealing part; and the protection plate assembly comprises a protection plate and an insulation frame positioned on the outer side of the protection plate, and the protection plate is electrically connected to the tab. The battery further comprises a colloid, wherein at least part of the colloid is located between the main body part and the insulation frame and is connected with the main body part and the insulation frame.

In the battery according to some embodiments, the battery core forms a first cavity and a second cavity on two sides of the top sealing part, and the colloid is accommodated in the first cavity and connected to the top sealing part.

In the battery according to some embodiments, a depth of the first cavity is greater than a depth of the second cavity in a thickness direction of the battery cell.

In the battery according to some embodiments, in the thickness direction of the battery cell, the end of the colloid far away from the top sealing part does not exceed the main body part.

In the battery according to some embodiments, the main body part has an inclined surface at an end facing the protection board assembly, and the gel is coupled to the inclined surface.

In a battery according to some embodiments, the main body portion further includes an arc surface connected between the inclined surface and a surface of the top seal portion.

In a battery according to some embodiments, the cell further includes two side seals, and the main body portion and the top seal are located between the two side seals. The colloid is also connected to the side seal part.

In a battery according to some embodiments, the sealant connects the side sealing part and the insulating frame.

The present application also provides a device using a battery, comprising a battery as described above, which provides electrical energy to the device.

The utility model has the advantages as follows: in this application, the main part can be through the colloid fixed with support protection plate subassembly, simultaneously, the colloid can also play the cushioning effect through warping, consequently, when the battery falls, the colloid can reduce the impact force that main part and top seal portion received, reduces the cracked risk of main part, improves the security performance of battery.

Drawings

Fig. 1 is a schematic diagram of some embodiments of a device using a battery according to the present application.

Fig. 2 is a schematic diagram of a battery according to some embodiments.

Fig. 3 is a schematic diagram of a cell of a battery according to some embodiments.

Fig. 4 is a schematic view of the cell of fig. 3 before molding.

Fig. 5 is a top view of the battery of fig. 2.

Fig. 6 is a cross-sectional view of the battery of fig. 5 taken along line a-a.

Fig. 7 is an enlarged view of the box portion of fig. 6.

Fig. 8 is a schematic view of a protective plate of a battery according to some embodiments.

Fig. 9 is a schematic diagram of the gel after molding.

Wherein the reference numerals are as follows:

1 electric core

11 body part

111 inclined plane

112 arc surface

113 major face

12 tip seal

13 tab

14 side seal

15 first cavity

16 second cavity

17 packaging bag

18 electrode assembly

2 protection plate assembly

21 protective plate

211 body

212 flexible circuit board

22 insulating frame

3 colloid

31 first part

32 second part

Detailed Description

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

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions. The terms "first," "second," and the like in the description and claims of this application or in the above-described drawings are used for distinguishing between different elements and not for describing a particular sequential or chronological order.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

The "plurality" in the present application means two or more (including two), and similarly, "plural" means two or more (including two) and "plural" means two or more (including two).

The battery described in the embodiment of the present application is applicable to various devices using batteries, for example, mobile phones, portable devices, notebook computers, battery cars, electric automobiles, ships, spacecrafts, electric toys, electric tools, and the like; a battery provides power to the device. The battery described in the embodiments of the present application is not limited to be applied to the above-described devices, but may be applied to all devices using a battery. For example, fig. 1 shows a structure of a mobile phone 2000, a battery 1000 is disposed inside the mobile phone 2000, and the battery 1000 provides power for the mobile phone 2000 to meet power consumption requirements when the mobile phone is used.

Fig. 2 is a schematic diagram of a battery according to some embodiments. Fig. 3 is a schematic diagram of a cell of a battery according to some embodiments. Fig. 4 is a schematic view of the cell of fig. 3 before molding.

Referring to fig. 2 to 4, a battery 1000 according to some embodiments includes a cell 1. The battery cell 1 includes a main body portion 11, a top seal portion 12 connected to the main body portion 11, and a tab 13 extending from the top seal portion 12. In some embodiments, the cell 1 is a lithium cell.

Specifically, referring to fig. 4, the battery cell 1 includes a packaging bag 17 and an electrode assembly 18 housed in the packaging bag 17. The electrode assembly 18 is a core component of the battery cell 1 for realizing repeated charge and discharge functions. The electrode assembly 18 includes a positive electrode tab, a negative electrode tab, and a separator separating the positive electrode tab and the negative electrode tab, and in the present embodiment, the electrode assembly 18 may be formed by winding the positive electrode tab, the negative electrode tab, and the separator. The electrode assembly 18 may be pressed flat to form a flat shape. In the battery cell 1, the electrode assembly 18 may be one or more.

The packaging bag 17 may be an aluminum plastic film or a steel plastic film. The packing bag 17 may be formed by folding and connecting an aluminum plastic film or a steel plastic film. In some embodiments, referring to fig. 4, two recesses are formed in an aluminum plastic film (or a steel plastic film) by punching, then the electrode assembly 18 is placed in one recess, and finally the aluminum plastic film is folded into two layers (hereinafter, the two layers are referred to as a first packaging film and a second packaging film) so that the electrode assembly 18 is accommodated in the two recesses, that is, the two recesses constitute an accommodation chamber for accommodating the electrode assembly 18. The two recesses are formed in the first packaging film and the second packaging film, respectively. The edge of the surrounding concave portion of the first packaging film and the edge of the surrounding concave portion of the second packaging film are connected by thermocompression sealing to seal the accommodating chamber. The main body portion 11 of the battery cell 1 includes the electrode assembly 18 and a portion of the packaging bag 17 that surrounds the receiving cavity. The portion of the first and second packaging films that are sealingly connected forms a seal, which comprises a top seal 12.

The tab 13 is connected to the electrode assembly 18, passes through the top seal part 12, and protrudes outside the top seal part 12. The tabs 13 are provided in a plurality of numbers, the tabs 13 include positive tabs and negative tabs, the positive tabs are electrically connected to the positive pole piece, and the negative tabs are electrically connected to the negative pole piece.

In some embodiments, the sealing portion of the battery cell 1 further includes two side sealing portions 14, and the main body portion 11 and the top sealing portion 12 are located between the two side sealing portions 14. Each side seal 14 is connected to the main body 11 and the top seal 12. Referring to fig. 3, in some embodiments, the battery cell 1 is approximately rectangular parallelepiped, the top sealing part 12 is located on one side of the main body part 11 in the length direction of the battery cell 1, and the two side sealing parts 14 are respectively located on two sides of the main body part 11 in the width direction of the battery cell 1. Each side seal 14 is folded toward the main body 11 and bonded to the main body 11, with the side seal 14 being substantially perpendicular to the top seal 12. By bending the side seal 14, the dimension of the battery cell 1 in the width direction thereof can be reduced.

The thickness of the top seal portion 12 is smaller than that of the body portion 11, and therefore, referring to fig. 3, the battery cell 1 forms a first cavity 15 and a second cavity 16 on both sides of the top seal portion 12 in the thickness direction of the battery cell 1. The first cavity 15 is enclosed by the body 11, the top seal 12 and the two side seals 14, and the second cavity 16 is enclosed by the body 11 and the top seal 12.

Because of the chemical characteristics of the lithium battery, in the normal use process, the lithium battery performs a chemical positive reaction in which electric energy and chemical energy are converted into each other, but under certain conditions, such as overcharge, overdischarge, and overcurrent, chemical side reactions occur inside the battery core, which can seriously affect the performance and service life of the battery after the side reactions are intensified, and a large amount of gas may be generated, so that the internal pressure of the battery is rapidly increased and then explodes to cause a safety problem. Referring to fig. 2, the battery includes a protection board assembly 2 having a protection function, and the protection board assembly 2 includes a protection board composed of an electronic circuit, and constantly and accurately monitors the voltage of a cell and the current in a charge and discharge circuit. The protection board generally includes electronic components such as MOS switches, precision resistors, capacitors, and auxiliary devices FUSE, PTC, NTC, memory, connectors, and FPC.

Fig. 5 is a top view of the battery of fig. 2. Fig. 6 is a cross-sectional view of the battery of fig. 5 taken along line a-a. Fig. 7 is an enlarged view of the box portion of fig. 6.

Referring to fig. 5 to 7, in some embodiments, the protection plate assembly 2 includes a protection plate 21 and an insulation frame 22 located outside the protection plate 21, the protection plate 21 being electrically connected to the tab 13. The protection plate 21 can charge and discharge the battery cell 1 through the tab 13, and accurately monitor the voltage of the battery cell 1 and the current in the charge and discharge circuit at any time. In some embodiments, the protection plate assembly 2 is at least partially received in the first cavity 15, which can make full use of the space on one side of the top seal 12 and reduce the maximum size of the battery. The insulating frame 22 can support and fix the protection board 21 while improving insulation performance and reducing the risk of short-circuiting the protection board 21 by contact with other elements. In some embodiments, the insulation frame 22 is a plastic frame formed on the outer side of the protection plate 21 by injection molding.

When an unexpected condition such as dropping of the battery occurs, the electrode assembly 18 inside the packaging bag 17 moves and impacts the packaging bag 17, causing a risk of breakage of the main body portion 11 and of the top seal portion 12 being blown open. In some embodiments, the battery further comprises a gel 3, wherein the gel 3 is at least partially located between the main body portion 11 and the insulating frame 22 and connects the main body portion 11 and the insulating frame 22.

The main part 11 can be fixed and support the protection shield assembly 2 through the colloid 3, and simultaneously, the colloid 3 can also play the cushioning effect through warping, consequently, when the battery falls, the colloid 3 can reduce the impact force that main part 11 and top seal portion 12 received, reduces the cracked risk of main part 11, improves the security performance of battery.

In some embodiments, the glue body 3 is received in the first cavity 15 and connected to the top seal 12. By arranging the gel 3 in the first cavity 15, the space of the first cavity 15 can be fully utilized, and the maximum size of the battery can be reduced. Colloid 3 links together main part 11, top seal 12 and protection shield subassembly 2, improves the holistic stability of battery, plays the effect of buffering simultaneously between the three, when the battery falls, reduces the risk of breaking.

In some embodiments, the depth of the first cavity 15 is greater than the depth of the second cavity 16 in the thickness direction of the battery cell 1. Under the condition that the thickness of the battery core 1 is fixed, the depth of the first cavity 15 is increased, more space can be reserved for the protection plate assembly 2, and the maximum size of the battery is reduced. The first cavity 15 with a larger depth can also accommodate more glue bodies 3, so that the contact area between the main body part 11 and the glue bodies 3 is increased, and the buffering effect of the glue bodies 3 is improved.

In some embodiments, the end of the gel 3 away from the top sealing part 12 does not extend beyond the main body part 11 in the thickness direction of the battery cell 1. In other words, the body portion 11 has two main surfaces 113 in the thickness direction, and the main surfaces 113 are substantially planar and are the surfaces having the largest area of the body portion 11; the surface of the gel 3 away from the top seal part 12 does not exceed the main surface 113 of the main body part 11 in the thickness direction of the battery cell 1. At this time, the gel 3 does not increase the maximum size of the battery in the thickness direction.

In some embodiments, the main body 11, the top seal 12 and the protection board assembly 2 enclose a groove, glue is filled into the groove by spraying or the like, the glue forms a glue body 3 after curing, and the glue body 3 is adhered to the main body 11, the top seal 12 and the protection board assembly 2.

In some embodiments, the main body 11 has an inclined surface 111 at an end facing the protection plate assembly 2, and the gel 3 is coupled to the inclined surface 111. The inclined surface 111 is substantially planar. The inclined surface 111 is connected with one main surface 113, and the included angle between the inclined surface 111 and the one main surface 113 is an obtuse angle. In some embodiments, inclined surface 111 is connected to the one major surface 113 by a radiused transition surface.

This application connects main part 11 and protection shield subassembly 2 through spraying glue, consequently, even main part 11 is equipped with inclined plane 111, glue also can closely laminate with inclined plane 111, avoids producing the clearance between colloid 3 and inclined plane 111, reduces the cracked risk of main part 11.

In some embodiments, the main body portion 11 further includes a circular arc surface 112, and the circular arc surface 112 is connected between the inclined surface 111 and the surface of the tip seal portion 12. The arc surface 112 may serve as a transition to reduce stress concentration at the junction of the main body portion 11 and the overseal portion 12. The colloid 3 can be closely attached to the arc surface 112, and the risk of the main body portion 11 breaking at the arc surface 112 when the battery falls is reduced.

The side seal 14 is bent toward the main body 11, thereby reducing the maximum size of the battery. In some embodiments, the glue body 3 is further connected to the side seal portion 14, so that the connection strength between the main body portion 11 and the side seal portion 14 can be improved, and the risk of opening the side seal portion 14 is reduced.

In some embodiments, the gel 3 also connects the side seal 14 and the insulating frame 22. Specifically, referring to fig. 2 and 9, the gel 3 includes an elongated first portion 31 and second portions 32 protruding from both ends of the first portion 31. The first portion 31 is located between the main body portion 11 and the insulating frame 22 and connects the main body portion 11 and the insulating frame 22. A gap is left between the side seal 14 and the insulating frame 22, and the second portion 32 fills the gap and connects the side seal 14 and the insulating frame 22.

In some embodiments, referring to fig. 7 and 8, the protection plate 21 includes a body 211 and a flexible circuit board 212, and the body 211 has a higher hardness than the flexible circuit board 212. The body 211 is provided with electronic components such as MOS switches and precision resistors. The flexible circuit board 212 has a connector mounted thereon for connection to a host side (e.g., a cellular phone, a notebook). The flexible circuit board 212 is flexible and easy to bend, which facilitates the connection of the connector 2 with the host. The body 211 is accommodated in the insulating frame 22, and the flexible circuit board 212 extends out of the insulating frame 22.

The protective plate 21 further includes connecting pieces made of metal, which are connected to the tab 13 and the body 211. The connecting piece may have a U-shape, and a portion of the tab 13 is held by the connecting piece.

Claims

1. A battery, comprising:

the battery cell comprises a battery cell (1), wherein the battery cell (1) comprises a main body part (11), a top seal part (12) connected to the main body part (11) and a tab (13) extending from the top seal part (12); and

the protection plate assembly (2) comprises a protection plate (21) and an insulation frame (22) positioned on the outer side of the protection plate (21), and the protection plate (21) is electrically connected to the lug (13);

it is characterized in that the preparation method is characterized in that,

the battery further comprises a colloid (3), wherein the colloid (3) is at least partially positioned between the main body part (11) and the insulating frame (22) and is connected with the main body part (11) and the insulating frame (22).

2. The battery according to claim 1, characterized in that the cell (1) forms a first cavity (15) and a second cavity (16) on both sides of the top seal (12), the gel (3) being accommodated in the first cavity (15) and connected to the top seal (12).

3. The battery according to claim 2, characterized in that the depth of the first cavity (15) is greater than the depth of the second cavity (16) in the thickness direction of the cell (1).

4. The battery according to claim 2 or 3, characterized in that the end of the gel (3) away from the top seal part (12) does not exceed the main body part (11) in the thickness direction of the battery cell (1).

5. The battery according to claim 2,

the main body part (11) has an inclined surface (111) at an end facing the protection plate assembly (2), and the colloid (3) is connected to the inclined surface (111).

6. The battery according to claim 5, wherein the main body portion (11) further comprises an arc surface (112), and the arc surface (112) is connected between the inclined surface (111) and the surface of the top seal portion (12).

7. The battery according to claim 1,

the battery cell (1) further comprises two side sealing parts (14), and the main body part (11) and the top sealing part (12) are positioned between the two side sealing parts (14);

the colloid (3) is also connected to the side seal part (14).

8. The battery according to claim 7, characterized in that the glue (3) connects the side seals (14) and the insulating frame (22).

9. A device using a battery, comprising a battery according to any of claims 1-8, said battery providing electrical energy to said device.