CN212517274U

CN212517274U - Battery and device using battery

Info

Publication number: CN212517274U
Application number: CN202021584365.0U
Authority: CN
Inventors: 韦天华; 曹轶芳; 张静; 刘雪峰
Original assignee: Dongguan Nvt Technology Co Ltd
Current assignee: Dongguan Nvt Technology Co Ltd
Priority date: 2020-08-03
Filing date: 2020-08-03
Publication date: 2021-02-09
Anticipated expiration: 2030-08-03

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 sealing part connected with the main body part and a plurality of tabs extending out of the sealing part; the protective plate comprises a first protective plate and a second protective plate, and each electrode lug is electrically connected to the first protective plate and the second protective plate.

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.

At present, the battery quick-charging technology is in a trend, the middle and high-end mobile phones adopt a quick-charging design, and the quick-charging power of the flagship version mobile phone is over 40W. Because various functions of the mobile phone are continuously improved, the capacity of the battery is continuously increased, and how to realize quick charging becomes a key point pursued by users.

With the development of various fast charging technologies, the current carried by the battery protection circuit is larger and larger. In the design of the traditional quick charging protection scheme, the heat of the battery is concentrated on some high-heating electronic components, such as MOS, precision resistor, connector, FPC and the like, so that the power loss is increased, the performance deterioration of the battery is accelerated, and even safety problems can occur.

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 same, which can reduce the temperature rise of a protection plate, and improve the performance and life of the battery.

To achieve the above object, in some embodiments, the present invention provides a battery including: the battery cell comprises a main body part, a sealing part connected to the main body part, and a plurality of tabs extending out of the sealing part. The battery also comprises a first protection plate and a second protection plate, and each lug is electrically connected to the first protection plate and the second protection plate.

In a battery according to some embodiments, the first protection plate includes a first body and a first connector connected to the first body and the tab. The second protection plate comprises a second body and a second connecting piece, and the second connecting piece is connected to the second body and the lug.

In a battery according to some embodiments, the first body is located between the sealing portion and the second body.

In a battery according to some embodiments, the first connection member includes a first connection part connected to the first body, a second connection part to which the tab is connected, and a first transition part bent and connecting the first connection part and the second connection part.

In a battery according to some embodiments, the first connecting portion is located between the sealing portion and the first body, and the second connecting portion is located on a side of the first body away from the main body portion. The first body is provided with a first groove, and the second connecting part at least partially penetrates through the first groove.

In the battery according to some embodiments, the tab includes a first bent portion bent with respect to the sealing portion and a second bent portion bent with respect to the first bent portion toward a direction close to the main body portion. The first bending part is connected to the second connecting part, and the second bending part is connected to the second connecting part.

In a battery according to some embodiments, the second bending part is located at a side of the second body away from the first body. The second body is provided with a second groove, and a part of the tab penetrates through the second groove.

In the battery according to some embodiments, the second connection member includes a third connection portion fixed to the second body, a fourth connection portion located at a side of the third connection portion away from the second body, and a second transition portion bent and connecting the third connection portion and the fourth connection portion. At least part of the second bending part is located between the third connecting part and the fourth connecting part and is fixed to the fourth connecting part.

In the battery according to some embodiments, the second connection member includes a third connection part fixed to the second body, a fourth connection part between which a portion of the tab is fixed, and a second transition part bent and connecting the third connection part and the fourth connection part.

In a battery according to some embodiments, the third connecting portion is located on a side of the second body away from the first body. The second body is provided with a second groove, and the fourth connecting part at least partially penetrates through the second groove.

In the battery according to some embodiments, the main body portion includes a first surface and a second surface that are disposed opposite to each other in a thickness direction of the battery cell, and a distance between the sealing portion and the first surface is greater than a distance between the sealing portion and the second surface. The first body and the second body are both located on a side of the sealing portion that is proximate to the first surface.

In a battery according to some embodiments, the first protection plate further includes a first extension extending from the first body and a first connector provided to the first extension, and the first extension has a hardness lower than that of the first body. The second protection plate further comprises a second extension section extending from the second body and a second connector arranged on the second extension section, and the hardness of the second extension section is lower than that of the second body.

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 the battery of this application, first protection shield and second protection shield are in the parallel state, can play the effect of reposition of redundant personnel, and at the in-process of charge-discharge, this application can reduce the electric current in first protection shield and the second protection shield effectively, reduces electronic components's calorific capacity, reduces the temperature rise of first protection shield and second protection shield, improves the performance and the life-span 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 first embodiment of a battery according to the present application.

Fig. 3 is a schematic diagram of a cell of a battery according to the present application.

Fig. 4 is a cross-sectional view of the cell of fig. 3.

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

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

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

Fig. 8 is a schematic view of a first protective plate of a battery according to the present application.

Fig. 9 is a schematic view of a second protective plate of a battery according to the present application.

Fig. 10 is a schematic view of the battery according to the first embodiment during molding, and shows the first protective sheet and the cell.

Fig. 11 is a schematic view of the battery according to the first embodiment during molding, and shows the first protective plate, the second protective plate, and the cell.

Fig. 12 is a schematic view of the battery according to the first embodiment during the molding process, and shows a state in which the second protective sheet of fig. 11 is bent.

Fig. 13 is a schematic diagram of a second embodiment of a battery according to the present application.

Fig. 14 is a top view of a portion of the battery of fig. 13.

Fig. 15 is a cross-sectional view taken along line B-B of fig. 14.

Fig. 16 is an enlarged view of the box portion of fig. 15.

Fig. 17 is a schematic view of a battery according to the second embodiment during molding, and shows a first protective sheet and a cell.

Fig. 18 is a schematic view of a battery according to the second embodiment in a molding process, and shows a first protective plate, a second protective plate, and a cell.

Fig. 19 is a schematic diagram of a third embodiment of a battery according to the present application.

Fig. 20 is a top view of a portion of the battery of fig. 19.

Fig. 21 is a cross-sectional view taken along line C-C of fig. 20.

Fig. 22 is an enlarged view of the block portion of fig. 21.

Fig. 23 is a schematic view of a battery according to the third embodiment in a molding process, and shows a first protective sheet and a cell.

Fig. 24 is a schematic view of a battery according to the third embodiment in a molding process, and shows a first protective sheet, a second protective sheet, and a cell.

Wherein the reference numerals are as follows:

1 electric core 22 first connecting piece

11 body 221 first connection part

111 first surface 222 second connection portion

112 second surface 223 first transition

12 sealing portion 23 first extension

121 tip seal 24 first connector

122 side seal 3 second protective plate

13 second body of tab 31

131 first bending part 311 second groove

132 second bent part 32 second connecting piece

133 base portion 321 third connecting portion

14 packaging bag 322 fourth connecting part

15 electrode assembly 323 second transition

16 seal 33 second extension

2 first protective plate 34 second connector

21 first body 35 flexible circuit board

211 first groove 36 stiffening plate

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 1000, a battery 2000 is disposed inside the mobile phone 1000, and the battery 2000 provides power for the mobile phone 1000 to meet power consumption requirements when the mobile phone is used.

Fig. 2 is a schematic diagram of a first embodiment of a battery according to the present application. Fig. 3 is a schematic diagram of a cell of a battery according to the present application. Fig. 4 is a cross-sectional view of the cell of fig. 3.

Referring to fig. 2 to 4, a battery 2000 according to the first embodiment includes a cell 1. The battery cell 1 includes a main body portion 11, a sealing portion 12 connected to the main body portion 11, and a plurality of tabs 13 protruding from the sealing portion 12. The battery cell 1 may be a lithium battery cell.

Specifically, the battery cell 1 includes a packaging bag 14 and an electrode assembly 15 housed in the packaging bag 14. The electrode assembly 15 is a core component of the battery cell 1 for realizing repeated charge and discharge functions. The electrode assembly 15 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 15 may be formed by winding the positive electrode tab, the negative electrode tab, and the separator. The electrode assembly 15 may be pressed flat to form a flat shape. In one embodiment, the electrode assembly 15 may be provided in plurality and stacked.

The package 14 may be an aluminum-plastic film or a steel-plastic film. The packaging bag 14 may be formed by folding and connecting an aluminum plastic film or a steel plastic film. In some embodiments, two cavities are formed in the aluminum plastic film (or the steel plastic film) by punching, and then the aluminum plastic film is folded into two layers (hereinafter, the two layers are referred to as a first wrapping film and a second wrapping film) so that the two cavities are opposite. Wherein the two cavities are formed in the first packaging film and the second packaging film, respectively. The cavity of the first packaging film and the cavity of the second packaging film enclose a receiving cavity for receiving the electrode assembly 15. The edge of the first packaging film surrounding the cavity is connected with the edge of the second packaging film surrounding the cavity in a sealing mode so as to seal the accommodating cavity. The main body portion 11 of the battery cell 1 includes the electrode assembly 15 and a portion of the packaging bag 14 that surrounds the receiving cavity, and the sealing portion 12 includes a portion where the first packaging film and the second packaging film are sealingly connected. In other embodiments, the bag 14 may be formed from two sheets of plastic-aluminum film that are heat bonded together.

The sealing part 12 includes a top sealing part 121 and two side sealing parts 122, the top sealing part 121 is located at one end of the main body part 11, the tab 13 extends from the top sealing part 121, and the two side sealing parts 122 are respectively located at two sides of the main body part 11. In order to reduce the space occupied by the battery cell 1, the side seal part 122 is bent and bonded to the main body part 11.

The tabs 13 of the battery cell 1 include a positive tab and a negative tab, the positive tab is electrically connected to the positive pole piece, and the negative tab is electrically connected to the negative pole piece. In some embodiments, the positive and negative electrode tabs are each one. In some alternative embodiments, the positive electrode tab may be plural, and the negative electrode tab may be plural. Each tab 13 extends through the top seal 121 and into the interior of the package 14 to facilitate electrical connection to the pole piece.

The battery cell 1 further comprises a sealing member 16, wherein the sealing member 16 surrounds the outer side of the tab 13 and separates the tab 13 from the top seal part 121, so as to prevent the tab 13 from contacting with metal (such as an aluminum layer in an aluminum plastic film) in the top seal part 121.

The main body portion 11 includes a first surface 111 and a second surface 112 that are oppositely disposed in the thickness direction of the battery cell 1. In some embodiments, referring to fig. 3 and 4, in the thickness direction of the battery cell 1, one side of the top seal part 121 forms a first concave pit recessed relative to the first surface 111, and the other side of the top seal part 121 forms a second concave pit recessed relative to the second surface 112. The depth of the first pit is greater than the depth of the second pit. At this time, the distance between the top seal part 121 and the first surface 111 is greater than the distance between the top seal part 121 and the second surface 112 in the thickness direction of the battery cell 1. Before bending the edge seal 122, the edge seal 122 is spaced further from the first surface 111 than the edge seal 122 is spaced further from the second surface 112

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, the chemical negative reaction in the battery core will occur, after the side reaction is intensified, the performance and the service life of the battery will be seriously affected, 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. The battery comprises a protection board with a protection function, wherein the protection board is composed of an electronic circuit, and the voltage of a battery core and the current in a charge-discharge loop are accurately monitored at any time. 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 a portion of the battery of fig. 2. Fig. 6 is a cross-sectional view taken along line a-a of fig. 5. Fig. 7 is an enlarged view of the box portion of fig. 6.

Referring to fig. 5 to 7, the battery 2000 in accordance with the first embodiment further includes a first protective plate 2 and a second protective plate 3, and each tab 13 is electrically connected to the first protective plate 2 and the second protective plate 3. The first protection plate 2 and the second protection plate 3 can independently realize charging and discharging of the battery cell 1 through the tab 13, and accurately monitor the voltage of the battery cell 1 and the current in a charging and discharging loop at any time.

In the battery 2000 of this application, first protection shield 2 and second protection shield 3 are in the parallel state, can play the effect of reposition of redundant personnel, and at the in-process of charge-discharge, this application can reduce the electric current in first protection shield 2 and the second protection shield 3 effectively, reduces electronic components's calorific capacity, reduces the temperature rise of first protection shield 2 and second protection shield 3, improves the performance and the life-span of battery.

In addition, the battery 2000 can reduce the temperature rise of the protection board, so that the high-power quick charge can be supported.

The first protection plate 2 includes a first body 21 and a first connection member 22, and the first connection member 22 is connected to the first body 21 and the tab 13. The second protection plate 3 includes a second body 31 and a second connection member 32, and the second connection member 32 is connected to the second body 31 and the tab 13. The first body 21 and the second body 31 may be used to dispose electronic components. The first connector 22 is used to electrically connect the first body 21 and the tab 13, and the second connector 32 is used to electrically connect the second body 31 and the tab 13. The first and

second connectors

22, 32 may be sheet metal, preferably nickel. The number of the first connection members 22, the number of the second connection members 32, and the number of the tabs 13 are the same.

In some embodiments, the first protective plate 2, the second protective plate 3, and the sealing portion 12 at least partially overlap in the thickness direction of the battery cell 1. The top seal portion 121 has a thickness smaller than that of the main body portion 11, so that a certain space exists at both sides of the top seal portion 121, and at this time, the first protective plate 2 and the second protective plate 3 can use the space, thereby reducing the size of the battery and improving the energy density.

In some embodiments, the depth of the first recess is greater than the depth of the second recess, so that the space on the side of the sealing part 12 close to the first surface 111 is larger, and at this time, it is preferable that the first body 21 and the second body 31 are both located on the side of the sealing part 12 close to the first surface 111. Further, the first body 21 is located between the sealing portion 12 and the second body 31.

In other embodiments, the depth of the first recess is equal to or approximately equal to the depth of the second recess, and in this case, the first body 21 and the second body 31 may be disposed on both sides of the sealing part 12, respectively.

Referring to fig. 7, the first connection member 22 includes a first connection portion 221, a second connection portion 222, and a first transition portion 223, the first connection portion 221 is connected to the first body 21, the tab 13 is connected to the second connection portion 222, and the first transition portion 223 is bent and connects the first connection portion 221 and the second connection portion 222. The second connection portion 222 may be connected to the tab 13 by welding or the like.

The first connection portion 221 is located between the sealing portion 12 and the first body 21, and the second connection portion 222 is located on a side of the first body 21 away from the main body portion 11. In some embodiments, the first body 21 is provided with a first recess 211, and the second connection portion 222 at least partially passes through the first recess 211. The first recess 211 may reserve a space for the second connection portion 222, reducing the risk of the second connection portion 222 contacting the first body 21.

The tab 13 includes a first bent portion 131, a second bent portion 132, and a base portion 133, the base portion 133 passes through the sealing portion 12, an inner end of the base portion 133 is electrically connected to the pole piece, and an outer end thereof protrudes outside the sealing portion 12. The first bent portion 131 is bent with respect to the sealing portion 12, and the second bent portion 132 is bent with respect to the first bent portion 131 in a direction closer to the main body portion 11. The first bent portion 131, the second bent portion 132, and the base portion 133 form a U-shaped structure. The first bending portion 131 is connected to the second connecting portion 222, and the second bending portion 132 is connected to the second connecting portion 32.

The second bending portion 132 is located on a side of the second body 31 away from the first body 21. At this time, the first body 21 and the second body 31 are located between the sealing part 12 and the second bent part 132. In some embodiments, the second body 31 is provided with a second groove 311, and a portion of the tab 13 passes through the second groove 311. The second groove 311 may reserve a space for the tab 13, reducing the risk of the tab 13 contacting the second body 31.

The second connecting member 32 includes a third connecting portion 321, a fourth connecting portion 322, and a second transition portion 323, the third connecting portion 321 is fixed to the second body 31, the fourth connecting portion 322 is located on a side of the third connecting portion 321 away from the second body 31, and the second transition portion 323 is bent and connected to the third connecting portion 321 and the fourth connecting portion 322. The third connecting portion 321, the fourth connecting portion 322, and the second transition portion 323 approximately form a U-shaped structure. At least a portion of the second bending part 132 is located between the third connecting part 321 and the fourth connecting part 322 and fixed to the fourth connecting part 322.

Fig. 8 is a schematic view of a first protective plate of a battery according to the present application. Fig. 9 is a schematic view of a second protective plate of a battery according to the present application.

Referring to fig. 8, the first protection plate 2 further includes a first extension 23 extending from the first body 21 and a first connector 24 provided to the first extension 23, and the first extension 23 has a hardness lower than that of the first body 21. The first connector 24 is used to connect to a host (e.g., a cell phone, a notebook). The first extension section 23 is relatively flexible and easy to bend, so that the first connector 24 can be conveniently connected with the host end. In some embodiments, the first protection plate 2 may be a rigid-flex board, the first body 21 is a rigid printed circuit board, and the first extension 23 is a flexible circuit board. The hard printed circuit board has higher hardness and can effectively support electronic components such as MOS switches, precision resistors and the like. The flexible circuit board is convenient to bend.

In some embodiments, the first extension sections 23 are provided in two and respectively extend from both ends of the first body 21, and the first connectors 24 are provided in two and respectively provided on the corresponding first extension sections 23. The two first connectors 24 can cause the first protection plate 2 to charge the battery cell 1 with higher power.

Referring to fig. 9, the second protection plate 3 further includes a second extension 33 extending from the second body 31 and a second connector 34 provided to the second extension 33, and the hardness of the second extension 33 is lower than that of the second body 31. The second connector 34 is used to connect to a host (e.g., cell phone, notebook). The second extension 33 is flexible and easy to bend, so that the second connector 34 can be connected to the host computer. In some embodiments, the second protection plate 3 includes a flexible circuit board 35 and a reinforcing plate 36, and the reinforcing plate 36 is fixed to the flexible circuit board 35. The reinforcing plate 36 and the portion of the flexible circuit board 35 overlapping the reinforcing plate 36 form the second body 31, and the portion of the flexible circuit board 35 not overlapping the reinforcing plate 36 forms the second extension 33. By providing the reinforcing plate 36, the strength of the second body 31 can be improved, and electronic components such as MOS switches and precision resistors can be effectively supported.

In some embodiments, the second extension 33 of the second protection plate 3 is provided as one; at this time, the first protection plate 2 charges the battery cell 1 at a higher power, and the second protection plate 3 charges the battery cell 1 at a lower power. Of course, the second extension 33 of the second protection plate 3 may be provided in plurality.

The molding process of the battery of the first embodiment will be briefly described with reference to fig. 10 to 12. Fig. 10 is a schematic view of the battery according to the first embodiment during molding, and shows the first protective sheet and the cell. Fig. 11 is a schematic view of the battery according to the first embodiment during molding, and shows the first protective plate, the second protective plate, and the cell. Fig. 12 is a schematic view of the battery according to the first embodiment during the molding process, and shows a state in which the second protective sheet of fig. 11 is bent.

Referring to fig. 10, before the first protective plate 2 and the battery cell 1 are assembled, the first connecting member 22 has a substantially flat plate shape and the second connecting portion 222 protrudes out of the first body 21. At the time of assembly, the first protection plate 2 is placed on the upper side of the sealing portion 12, and the second connection portion 222 is attached to the tab 13, and then the second connection portion 222 and the tab 13 are welded.

Referring to fig. 11, the second connection member 32 is substantially L-shaped before the second protective plate 3 and the battery cell 1 are assembled. In the assembly, the end of the tab 13 is attached to the fourth connection part 322 of the second connection member 32, and then the fourth connection part 322 and the tab 13 are welded.

Referring to fig. 12, the second connection member 32 is then bent to bend the second connection member 32 into a U-shape. At this time, a part of the tab 13 is sandwiched between the third connection part 321 and the fourth connection part 322.

Then, the tab 13 is folded back toward the main body portion 11 to bend the tab 13 into a U-shaped structure; as the tab 13 is bent, the first connecting member 22 is bent into a substantially L-shaped configuration, and the second main body 31 is also folded to the side of the first main body 21 away from the sealing part 12, thereby forming the battery 2000 shown in fig. 2.

In order to reserve a bending space for the tab 13 and the first connecting member 22 in the process of bending the tab 13 into the U-shaped structure, the first body 21 is provided with a first groove 211, and the second body 31 is provided with a second groove 311.

Referring to fig. 8, the width of the first transition portion 223 is smaller than the widths of the first and

second connection portions

221 and 222, which may facilitate bending of the first connection member 22. Likewise, the width of the second transition portion 323 is smaller than the widths of the third and

fourth connection portions

321 and 322.

Fig. 13 is a schematic diagram of a second embodiment of a battery according to the present application. Fig. 14 is a top view of a portion of the battery of fig. 13. Fig. 15 is a cross-sectional view taken along line B-B of fig. 14. Fig. 16 is an enlarged view of the box portion of fig. 15.

The battery according to the second embodiment is formed to be identical or similar to the battery according to the first embodiment except for the structure of the second connection member 22. Therefore, description of the structure equivalent to or similar to that of the first embodiment will be omitted.

Referring to fig. 13 to 16, in the second embodiment, the second connection member 22 has a plate-shaped structure without being bent during the battery molding process. The second bent parts 132 of the second body 31 and the tab 13 are respectively located at the second connection member 22

The molding process of the battery of the second embodiment will be briefly described with reference to fig. 17 to 18. Fig. 17 is a schematic view of a battery according to the second embodiment during molding, and shows a first protective sheet and a cell.

Referring to fig. 17, before the first protective plate 2 and the battery cell 1 are assembled, the first connecting member 22 has a substantially flat plate shape and the second connecting portion 222 protrudes out of the first body 21. At the time of assembly, the first protection plate 2 is placed on the upper side of the sealing portion 12, and the second connection portion 222 is attached to the tab 13, and then the second connection portion 222 and the tab 13 are welded.

Referring to fig. 18, the end of the tab 13 is attached to the second connection member 32, and then the second connection member 32 and the tab 13 are welded. Then, the tab 13 is folded back toward the main body portion 11 to bend the tab 13 into a U-shaped structure; as the tab 13 is bent, the first connecting member 22 is bent into a substantially L-shaped configuration, and the second body 31 is also folded over to the side of the first body 21 away from the sealing portion 12, thereby forming the battery 2000 shown in fig. 13.

Fig. 19 is a schematic diagram of a third embodiment of a battery according to the present application. Fig. 20 is a top view of a portion of the battery of fig. 19. Fig. 21 is a cross-sectional view taken along line C-C of fig. 20. Fig. 22 is an enlarged view of the block portion of fig. 21.

The battery according to the third embodiment is formed to be identical or similar to the battery according to the first embodiment except for the structures of the tab 13 and the second connection member 22. Therefore, description of the structure equivalent to or similar to that of the first embodiment will be omitted.

Referring to fig. 19 to 22, in the third embodiment, the second connection member 32 includes a third connection part 321, a fourth connection part 322, and a second transition part 323, the third connection part 321 is fixed to the second body 31, a portion of the tab 13 is fixed between the second connection part 222 and the fourth connection part 322, and the second transition part 323 bends and connects the third connection part 321 and the fourth connection part 322. The second connecting member 32 is bent approximately in an L-shaped configuration, and the tab 13 is bent approximately in an L-shaped configuration.

The third connecting portion 321 is located on a side of the second body 31 away from the first body 21. The second body 31 is provided with a second groove 311, and the fourth connecting portion 322 at least partially passes through the second groove 311. By providing the second groove 311, a space can be reserved for the fourth connection portion 322, and the risk of the fourth connection portion 322 contacting the second body 31 is reduced.

Referring to fig. 23 to 24, the process of forming the battery of the third embodiment will be briefly described. Fig. 23 is a schematic view of a battery according to the third embodiment in a molding process, and shows a first protective sheet and a cell. Fig. 24 is a schematic view of a battery according to the third embodiment in a molding process, and shows a first protective sheet, a second protective sheet, and a cell.

Referring to fig. 23, before the first protective plate 2 and the battery cell 1 are assembled, the first connecting member 22 has a substantially flat plate shape and the second connecting portion 222 protrudes out of the first body 21. At the time of assembly, the first protection plate 2 is placed on the upper side of the sealing portion 12, and the second connection portion 222 is attached to the tab 13, and then the second connection portion 222 and the tab 13 are welded.

Referring to fig. 24, before the second protective plate 3 and the battery cell 1 are assembled, the second connection member 32 has a substantially flat plate shape and the fourth connection portion 322 protrudes out of the first body 31. At the time of assembly, the fourth connection portion 322 is attached to the tab 13, and then the fourth connection portion 322 and the tab 13 are welded. At this time, the second connection part 222 and the fourth connection part 322 are located at both sides of the tab 13, respectively.

Then, the tab 13 is bent into an L shape, and the first connecting member 22 is also bent into a substantially L-shaped structure along with the bending of the tab 13. Then, the second connector 32 is bent into an L-shape, and the second body 31 is folded back to the side of the first body 21 away from the sealing part 12 with the bending of the second connector 32, thereby forming a battery 2000 as shown in fig. 19.

Claims

1. A battery, comprising:

the battery comprises a battery cell (1), wherein the battery cell (1) comprises a main body part (11), a sealing part (12) connected to the main body part (11) and a plurality of tabs (13) extending from the sealing part (12);

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

the battery also comprises a first protection plate (2) and a second protection plate (3), and each electrode lug (13) is electrically connected to the first protection plate (2) and the second protection plate (3).

2. The battery according to claim 1,

the first protection plate (2) comprises a first body (21) and a first connecting piece (22), and the first connecting piece (22) is connected to the first body (21) and the tab (13);

the second protection plate (3) comprises a second body (31) and a second connector (32), and the second connector (32) is connected to the second body (31) and the tab (13).

3. The battery according to claim 2, wherein the first body (21) is located between the sealing portion (12) and the second body (31).

4. The battery according to claim 3,

the first connecting piece (22) comprises a first connecting portion (221), a second connecting portion (222) and a first transition portion (223), the first connecting portion (221) is connected to the first body (21), the tab (13) is connected to the second connecting portion (222), and the first transition portion (223) is bent and connected with the first connecting portion (221) and the second connecting portion (222).

5. The battery according to claim 4,

the first connecting part (221) is positioned between the sealing part (12) and the first body (21), and the second connecting part (222) is positioned on one side of the first body (21) far away from the main body part (11);

the first body (21) is provided with a first groove (211), and the second connecting part (222) at least partially penetrates through the first groove (211).

6. The battery according to claim 4,

the tab (13) comprises a first bent part (131) and a second bent part (132), the first bent part (131) is bent relative to the sealing part (12), and the second bent part (132) is bent relative to the first bent part (131) towards the direction close to the main body part (11);

the first bending part (131) is connected to the second connecting part (222), and the second bending part (132) is connected to the second connecting part (32).

7. The battery according to claim 6,

the second bending part (132) is positioned on one side of the second body (31) far away from the first body (21);

the second body (31) is provided with a second groove (311), and a part of the tab (13) penetrates through the second groove (311).

8. The battery according to claim 6,

the second connecting piece (32) comprises a third connecting part (321), a fourth connecting part (322) and a second transition part (323), the third connecting part (321) is fixed on the second body (31), the fourth connecting part (322) is positioned on one side, far away from the second body (31), of the third connecting part (321), and the second transition part (323) is bent and connected with the third connecting part (321) and the fourth connecting part (322);

at least a portion of the second bending part (132) is located between the third connecting part (321) and the fourth connecting part (322) and fixed to the fourth connecting part (322).

9. The battery according to claim 4,

the second connecting piece (32) comprises a third connecting portion (321), a fourth connecting portion (322) and a second transition portion (323), the third connecting portion (321) is fixed to the second body (31), a part of the tab (13) is fixed between the second connecting portion (222) and the fourth connecting portion (322), and the second transition portion (323) is bent and connected with the third connecting portion (321) and the fourth connecting portion (322).

10. The battery according to claim 9,

the third connecting part (321) is positioned on one side of the second body (31) far away from the first body (21);

the second body (31) is provided with a second groove (311), and the fourth connecting part (322) at least partially penetrates through the second groove (311).

11. The battery according to claim 2,

the main body part (11) comprises a first surface (111) and a second surface (112) which are oppositely arranged along the thickness direction of the battery core (1), and the distance between the sealing part (12) and the first surface (111) is larger than the distance between the sealing part (12) and the second surface (112);

the first body (21) and the second body (31) are both located on a side of the sealing portion (12) close to the first surface (111).

12. The battery according to claim 2,

the first protection plate (2) further comprises a first extension section (23) extending from the first body (21) and a first connector (24) arranged on the first extension section (23), and the hardness of the first extension section (23) is lower than that of the first body (21);

the second protection plate (3) further comprises a second extension section (33) extending from the second body (31) and a second connector (34) provided to the second extension section (33), and the hardness of the second extension section (33) is lower than that of the second body (31).

13. A device using a battery comprising a battery as claimed in any one of claims 1 to 12, said battery providing electrical power to said device.