CN210576275U

CN210576275U - Square lithium ion battery

Info

Publication number: CN210576275U
Application number: CN201921222435.5U
Authority: CN
Inventors: 刘东凤; 黄锐升; 沈立强; 李路强; 刘志伟; 曾贤华
Original assignee: Huizhou Everpower Technology Co ltd
Current assignee: Huizhou Everpower Technology Co ltd
Priority date: 2019-07-30
Filing date: 2019-07-30
Publication date: 2020-05-19
Anticipated expiration: 2029-07-30

Abstract

The utility model discloses a square lithium ion battery, which comprises a battery, a battery shell and a protection plate component, wherein the battery comprises a battery cell body, a pole ear and a fixed plate, the fixed plate is arranged on the battery cell body, the pole ear is arranged on the fixed plate, and the plane where the fixed plate is arranged and the plane where the battery cell body is arranged form an acute angle C; the battery shell comprises a shell, a bending plate and a mounting plate, one side of the bending plate is arranged on the shell, the mounting plate is arranged on one side, away from the shell, of the bending plate, a mounting groove is formed in the shell, and the battery cell body is embedded in the mounting groove. The utility model relates to a square lithium ion battery, which can increase the structure size of the battery cell, increase the structure and capacity of the battery cell and improve the energy density of the lithium battery by bending the tab; moreover, the protection plate can be stably fixed with the pole lug of the lithium battery after being welded through the bending plate and the mounting plate, and the connection stability of the protection plate and the pole lug is improved.

Description

Square lithium ion battery

Technical Field

The utility model relates to a lithium ion battery field especially relates to a square lithium ion battery.

Background

The lithium battery is a primary battery using lithium metal or lithium alloy as a negative electrode material and using a non-aqueous electrolyte solution, unlike a lithium ion battery, which is a rechargeable battery, and a lithium ion polymer battery. The inventor of lithium batteries was edison. Because the chemical characteristics of lithium metal are very active, the requirements on the environment for processing, storing and using the lithium metal are very high. The lithium ion battery is divided into a square lithium battery (such as a commonly used mobile phone battery cell), a cylindrical lithium battery (such as 18650, 18500 and the like) and a button lithium battery according to the appearance; the lithium battery is divided into an aluminum shell lithium battery, a steel shell lithium battery and a soft package battery according to the external packing material; the anode material is divided into lithium cobaltate, lithium iron phosphate, lithium manganate and lithium polymer.

However, the conventional lithium battery includes a battery cell and positive and negative electrode tabs respectively disposed on the battery cell. The battery cell and the tabs have certain lengths, namely the length of the whole lithium battery is formed by combining the lengths of the battery cell and the tabs, and in the actual production, the structure size of the battery cell is limited by the structure, so that the structure and the capacity of the battery cell are smaller, and the energy density of the lithium battery is reduced; and, the utmost point ear of current lithium cell needs the lug beading on the protection shield, and the protection shield has not had any bearing mode after the welding, consequently can make protection shield and utmost point ear appear unsettled condition to the stability that protection shield and utmost point ear are connected has been reduced.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects in the prior art, and provides a square lithium ion battery, which can increase the structural size of a lithium battery cell, increase the structure and the capacity of the battery cell and improve the energy density of the lithium battery by bending a tab; moreover, the protection plate can be stably fixed with the pole lug of the lithium battery after being welded through the bending plate and the mounting plate, and the connection stability of the protection plate and the pole lug is improved.

The purpose of the utility model is realized through the following technical scheme:

a prismatic lithium ion battery comprising:

the battery comprises a battery cell body, a lug and a fixing sheet, wherein the fixing sheet is arranged on the battery cell body, the lug is arranged on the fixing sheet, and the plane where the fixing sheet is located and the plane where the battery cell body is located form an acute angle C;

the battery shell comprises a shell, a bending plate and a mounting plate, wherein one side of the bending plate is arranged on the shell, the mounting plate is arranged on one side of the bending plate away from the shell, the shell is provided with a mounting groove, and the battery cell body is embedded in the mounting groove; and

the protection plate assembly comprises a protection plate, a first solder paste sheet and a second solder paste sheet, the protection plate is arranged on the mounting plate, a first welding groove and a second welding groove are formed in the protection plate, the first solder paste sheet is arranged in the first welding groove, and the second solder paste sheet is arranged in the second welding groove.

In one embodiment, the battery further comprises a protective film, and the protective film is coated outside the battery cell body.

In one embodiment, the battery further comprises an insulating sleeve disposed on the tab.

In one embodiment, the tabs include a positive tab and a negative tab, the positive tab and the negative tab are respectively disposed on the fixing sheet, the positive tab is further welded to the first solder paste, and the negative tab is further welded to the second solder paste.

In one embodiment, the insulating sleeve comprises a first insulating sleeve and a second insulating sleeve, the first insulating sleeve is arranged outside the positive pole lug, and the second insulating sleeve is arranged on the negative pole lug.

In one embodiment, the housing includes a bottom plate and a plurality of side plates, each of the side plates is disposed on the bottom plate, and the bottom plate and the plurality of side plates jointly enclose a mounting groove.

In one embodiment, the housing further includes a first baffle plate and a second baffle plate, the first baffle plate and the second baffle plate are respectively disposed on the bottom plate, a space is disposed between the first baffle plate and the second baffle plate, three side plates are disposed, and the three side plates are respectively disposed on the bottom plate.

In one embodiment, the battery housing further includes a first limiting rod and a second limiting rod, and the first limiting rod and the second limiting rod are respectively disposed on the mounting plate.

In one embodiment, the bending plate comprises a connecting sheet and an inclined plate body, the inclined plate body is arranged on the shell, the mounting plate is arranged on the connecting sheet, and a plane where the inclined plate body is located and a plane where the connecting sheet is located are at a right angle.

In one embodiment, the acute angle C has a magnitude of: c e [ 15 degrees, 75 degrees ].

The utility model discloses compare in prior art's advantage and beneficial effect as follows:

the utility model relates to a square lithium ion battery, which can increase the structure size of the battery cell, increase the structure and capacity of the battery cell and improve the energy density of the lithium battery by bending the tab; moreover, the protection plate can be stably fixed with the pole lug of the lithium battery after being welded through the bending plate and the mounting plate, and the connection stability of the protection plate and the pole lug is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of a square lithium ion battery according to an embodiment of the present invention;

fig. 2 is a schematic structural view of the battery case shown in fig. 1.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

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 invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1, a square lithium ion battery includes: the battery 100, the battery case 200 and the protection plate assembly 300, it should be noted that the battery 100 is used for supplying power and storing energy; the battery case 200 serves to protect the battery; the protection plate assembly 300 is used to connect tabs of the battery.

Referring to fig. 1, the battery 100 includes a battery cell body 110, a tab 120 and a fixing sheet 130, the fixing sheet is disposed on the battery cell body, the tab is disposed on the fixing sheet, and a plane where the fixing sheet is located and a plane where the battery cell body is located form an acute angle C. In this embodiment, the size of the acute angle C is: c e [ 15 degrees, 75 degrees ]. Preferably, the acute angle C is 45 °. It should be noted that the cell body 110 is used for electrically connecting tabs; the tab 120 is used for connecting a protection plate; the fixing sheet 130 is used for fixing the tab.

Referring to fig. 1, the battery case 200 includes a housing 210, a bending plate 220 and a mounting plate 230, one side of the bending plate is disposed on the housing, the mounting plate is disposed on a side of the bending plate away from the housing, the housing has a mounting groove, and the battery cell body is embedded in the mounting groove. It should be noted that the casing 210 is used for wrapping the cell body to protect the cell body; the bending plate 220 is used for connecting a mounting plate; the mounting plate 230 is used to fix a protection plate.

Referring to fig. 1, the protection plate assembly 300 includes a protection plate 310, a first solder paste sheet 320 and a second solder paste sheet 330, the protection plate is disposed on the mounting plate, the protection plate is provided with a first solder groove and a second solder groove, the first solder paste sheet is mounted in the first solder groove, and the second solder paste sheet is mounted in the second solder groove. The protection plate 310 is used for connecting a tab and outputting the electric energy of the battery; the first solder paste sheet 320 and the second solder paste sheet 330 are respectively connected to the positive and negative electrode tabs.

Therefore, the tab is bent, so that the structural size of the battery cell of the lithium battery can be increased, the structure and the capacity of the battery cell are increased, and the energy density of the lithium battery is improved; moreover, the protection plate can be stably fixed with the pole lug of the lithium battery after being welded through the bending plate and the mounting plate, and the connection stability of the protection plate and the pole lug is improved.

Referring to fig. 1, the battery 100 further includes a protective film 140, and the protective film is wrapped outside the battery cell body. Thus, the protective film can improve the protective effect on the battery; in the present embodiment, the protective film may be an aluminum foil or an aluminum alloy foil.

Referring to fig. 1, the battery further includes an insulating sleeve 150 disposed on the tab. Thus, by providing the insulating sleeve 150, the protection of the battery tab can be improved, and the stability of the battery can be further improved.

Referring to fig. 1, the tabs include a positive tab and a negative tab, the positive tab and the negative tab are respectively disposed on the fixing sheet, the positive tab is further welded to the first solder paste, and the negative tab is further welded to the second solder paste. Therefore, the positive and negative lugs are arranged, and the voltages of the positive and negative ends can be output.

In this embodiment, the insulating sleeve includes a first insulating sleeve and a second insulating sleeve, the first insulating sleeve is disposed outside the positive tab, and the second insulating sleeve is disposed on the negative tab. So, through setting up first insulating cover and second insulating cover, can protect anodal auricle and negative pole auricle respectively, improve the effect of protection.

Referring to fig. 2, the housing 210 includes a bottom plate 211 and a plurality of side plates 212, each of the side plates is disposed on the bottom plate, and the bottom plate and the plurality of side plates jointly enclose an installation slot. So, through setting up bottom plate and curb plate, can wrap up electric core body, improve the guard action to the battery.

Referring to fig. 2, the housing 210 further includes a first baffle 213 and a second baffle 214, the first baffle and the second baffle are respectively disposed on the bottom plate, a space is disposed between the first baffle and the second baffle, three side plates are disposed, and the three side plates are respectively disposed on the bottom plate. Thus, by the arrangement of the first baffle 213 and the second baffle 214, the battery cell body can be blocked to prevent the battery cell body from sliding out of the mounting groove.

Referring to fig. 2, the battery housing 200 further includes a first limiting rod 240 and a second limiting rod 250, and the first limiting rod and the second limiting rod are respectively disposed on the mounting plate. Thus, the protection plate can be limited between the first limiting rod 240 and the second limiting rod 250, and the stability of the protection plate is improved.

Referring to fig. 1, the bending plate includes a connecting sheet and an inclined plate, the inclined plate is disposed on the housing, the mounting plate is disposed on the connecting sheet, and a plane of the inclined plate is perpendicular to a plane of the connecting sheet. So, through being provided with certain angle, can place this place that is the right angle when the protection shield plate welds, conveniently carry out the welding operation of protection shield plate.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A prismatic lithium ion battery, comprising:

2. The square lithium ion battery of claim 1, further comprising a protective film coated outside the cell body.

3. The prismatic lithium ion battery of claim 1, further comprising an insulating sleeve disposed over said tabs.

4. The square lithium ion battery of claim 3, wherein the tabs comprise a positive tab and a negative tab, the positive tab and the negative tab are respectively disposed on the fixed sheet, the positive tab is further welded to the first solder paste sheet, and the negative tab is further welded to the second solder paste sheet.

5. The square lithium ion battery of claim 4, wherein the insulating sleeve comprises a first insulating sleeve and a second insulating sleeve, the first insulating sleeve is disposed outside the positive tab, and the second insulating sleeve is disposed on the negative tab.

6. The square lithium ion battery of claim 1, wherein the housing comprises a bottom plate and a plurality of side plates, each of the side plates is disposed on the bottom plate, and the bottom plate and the plurality of side plates jointly enclose a mounting groove.

7. The square lithium ion battery of claim 6, wherein the housing further comprises a first baffle and a second baffle, the first baffle and the second baffle are respectively disposed on the bottom plate, a space is disposed between the first baffle and the second baffle, three side plates are disposed, and the three side plates are respectively disposed on the bottom plate.

8. The li-ion prismatic battery of claim 1, wherein the battery housing further comprises a first limiting rod and a second limiting rod, the first limiting rod and the second limiting rod being disposed on the mounting plate, respectively.

9. The square lithium ion battery of claim 1, wherein the bending plate comprises a connecting plate and an inclined plate, the inclined plate is disposed on the housing, the mounting plate is disposed on the connecting plate, and a plane of the inclined plate is at a right angle to a plane of the connecting plate.

10. The square lithium ion battery of claim 1, wherein the acute angle C has a magnitude of: c e [ 15 degrees, 75 degrees ].