CN217823174U

CN217823174U - High-energy density square aluminum shell lithium power battery

Info

Publication number: CN217823174U
Application number: CN202221921076.4U
Authority: CN
Inventors: 李宝玉; 谢群; 金凯荣; 章元; 朱小兵
Original assignee: Shihlien Chemical Industrial Jiangsu Co
Current assignee: Shihlien Chemical Industrial Jiangsu Co
Priority date: 2022-07-25
Filing date: 2022-07-25
Publication date: 2022-11-15
Anticipated expiration: 2032-07-25

Abstract

The utility model relates to a lithium ion power battery field especially relates to a square aluminum hull lithium power battery of high energy density. The technical scheme comprises the following steps: the battery core package comprises a battery core package body and a top cover plate, wherein a positive electrode lug is arranged on one side of the top of the battery core package body, a negative electrode lug is arranged on one side, away from the positive electrode lug, of the top of the battery core package body, and a positive electrode post and a negative electrode post are arranged on two sides of the top cover plate respectively. And then placing the top cover plate with the positive pole post and the negative pole post, wherein the positive pole lug and the negative pole lug are respectively in direct contact with the positive pole post and the negative pole post, and performing laser welding on the positive pole post and the negative pole post. The utility model discloses a cancel the connection piece between pole piece and casing utmost point post, pole piece utmost point ear is direct and utmost point post lower edge laser welding, and then the inside space utilization of effectual improvement lithium ion battery puts into more pole pieces, effectively promotes lithium ion battery's energy density, and when the welding, anodal utmost point ear department adds the small size aluminium strip, and negative utmost point ear department adds the small size nickel strap and strengthens solder joint, effectual improvement welding strength.

Description

High-energy density square aluminum shell lithium power battery

Technical Field

The utility model relates to a lithium ion power battery field especially relates to a square aluminum hull lithium power battery of high energy density.

Background

New energy automobile development that uses the lithium cell as the power supply is underway, and electric automobile possesses green energy-conservation, and the easy-open is easily maintained etc. advantage, receives more and more liking of people. The endurance mileage is an important index of the new energy electric automobile, not only influences the cost of purchasing the automobile, but also has direct influence on the driving experience and the use value of the automobile, and becomes the aspect of primary consideration when people purchase the new energy electric automobile. The endurance mileage of the electric vehicle is determined by the electric quantity of the battery, and after the space where the battery can be installed on the vehicle body and the load are considered, the larger the electric quantity of the battery is, the larger the endurance mileage of the electric vehicle can be correspondingly.

The endurance of the electric vehicle goes through the development process from 100-200 km to 500-600 km at present, but the requirement of people on endurance mileage is higher and higher, which also provides a challenge for improving the energy density of the lithium ion battery. The energy density refers to the amount of electricity stored in a unit volume or a unit weight of the battery, and the improvement of the energy density of the battery is an important breakthrough point in the development of the current battery technology.

The traditional lithium ion battery is prepared by coating positive and negative active materials on a conductive base material in a slurry form to prepare pole pieces, insulating the positive and negative pole pieces by using a diaphragm, assembling the pole pieces in a shell in a winding or stacking mode, and injecting electrolyte for activation. When the pole piece is assembled into the shell after winding or laminating is finished, the pole lug of the battery pole piece is connected with the pole post of the shell in a laser welding mode through the connecting sheet, so that the inside and the outside of the battery are conducted. The connecting piece needs to occupy certain space in the shell, and the space is reserved when the battery pole piece is designed, and the space which is not occupied by the pole piece does not contain active substances, so that the electric quantity cannot be stored.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a square aluminum hull lithium power battery of high energy density to the problem that exists among the background art.

The technical scheme of the utility model: the utility model provides a square aluminum hull lithium power battery of high energy density, includes battery core package and lamina tecti, battery core package top one side is provided with anodal ear, battery core package top is kept away from anodal ear one side and is provided with the negative pole ear, lamina tecti top both sides are provided with anodal post and negative pole post respectively.

Preferably, the positive tab on the battery core package is an aluminum foil, and the negative tab on the battery core package is a copper foil.

Preferably, the positive tab is aligned with and in direct contact with the positive post and the negative tab is aligned with and in direct contact with the negative post.

Preferably, the positive tab and the positive post are welded by laser, and the negative tab and the negative post are welded by laser.

Preferably, auxiliary welding belts are arranged between the positive tab and the positive post and between the negative tab and the negative post.

Preferably, the auxiliary welding strip between the positive tab and the positive post is an aluminum strip, and the auxiliary welding strip between the negative tab and the negative post is a nickel strip.

Compared with the prior art, the utility model discloses following profitable technological effect has:

1. the utility model discloses a cancel the connection piece between pole piece and casing utmost point post, pole piece utmost point ear is direct and utmost point post lower edge laser welding, and then the inside space utilization of effectual improvement lithium ion battery puts into more pole pieces, effectively promotes lithium ion battery's energy density.

2. The utility model discloses when the welding, positive pole utmost point ear department adds the small size aluminium strip, and negative pole utmost point ear department adds the small size nickel strap and strengthens solder joint, effectual improvement weld strength.

Drawings

Fig. 1 shows a schematic structural diagram of a high energy density square aluminum-shell lithium power battery of the present invention;

FIG. 2 is an enlarged schematic view of the structure at A in FIG. 1;

fig. 3 is a partial structural schematic diagram of fig. 1.

Reference numerals: 1. a battery core package; 2. a top cover plate; 3. a positive tab; 4. a negative tab; 5. a positive post; 6. a negative pole post; 7. an aluminum strip; 8. a nickel band.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

Example one

As shown in fig. 1-3, the utility model provides a square aluminum hull lithium power battery of high energy density, including battery core package 1 and lamina tecti 2, 1 top one side of battery core package is provided with anodal ear 3, 3 one sides of anodal ear are kept away from at 1 top of battery core package are provided with negative pole ear 4, 2 top both sides of lamina tecti are provided with anodal post 5 and negative pole post 6 respectively, anodal ear 3 on the battery core package 1 is the aluminium foil, negative pole ear 4 on the battery core package 1 is the copper foil, anodal ear 3 aligns and direct contact with anodal post 5, negative pole ear 4 aligns and direct contact with negative pole post 6, anodal ear 3 and 5 laser welding of anodal post, negative pole ear 4 and 6 laser welding of negative pole post.

The working principle based on the first embodiment is as follows: the battery core package 1 that will convolute or the lamination is accomplished is put into the laser welding frock, then puts into the lamina tecti 2 that has anodal post 5 and negative pole post 6, and anodal ear 3 at battery core package 1 top is the aluminium foil, and negative pole ear 4 at battery core package 1 top is the copper foil, and anodal ear 3 and negative pole ear 4 respectively with anodal post 5 and negative pole post 6 direct contact, and anodal ear 3 is to its anodal post 5, and negative pole ear 4 is to its negative pole post 6, carries out laser welding to it.

Example two

As shown in fig. 1, on the basis of embodiment one, the utility model provides a square aluminum hull lithium power battery of high energy density, including battery core package 1 and lamina tecti 2, battery core package 1 top one side is provided with anodal ear 3, anodal ear 3 one side is kept away from at battery core package 1 top is provided with negative pole ear 4, 2 top both sides of lamina tecti are provided with anodal post 5 and negative pole post 6 respectively, anodal ear 3 on the battery core package 1 is the aluminium foil, negative pole ear 4 on the battery core package 1 is the copper foil, anodal ear 3 aligns and direct contact with anodal post 5, negative pole ear 4 aligns and direct contact with negative pole post 6, anodal ear 3 and 5 laser welding of anodal post, negative pole ear 4 and 6 laser welding of negative pole post.

Compared with the first embodiment, the present embodiment further includes: all be provided with the auxiliary weld area between anodal ear 3 and the anodal post 5 and between negative pole ear 4 and the negative pole post 6, the auxiliary weld area is aluminium strip 7 between anodal ear 3 and the anodal post 5, and the auxiliary weld area is nickel strip 8 between negative pole ear 4 and the negative pole post 6.

The working principle is as follows: based on the working principle of the first embodiment, before welding, an aluminum strip 7 is placed between the positive tab 3 and the positive post 5, and a nickel strip 8 is placed between the negative tab 4 and the negative post 6, so that the welding effect is effectively improved and enhanced.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Other parts not described in detail in the present invention belong to the prior art, and are not described herein again.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims

1. The utility model provides a square aluminum hull lithium power battery of high energy density, includes battery core package (1) and lamina tecti (2), its characterized in that: the battery core bag is characterized in that a positive electrode lug (3) is arranged on one side of the top of the battery core bag (1), a negative electrode lug (4) is arranged on one side, away from the positive electrode lug (3), of the top of the battery core bag (1), and a positive pole post (5) and a negative pole post (6) are respectively arranged on two sides of the top cover plate (2).

2. The high energy density square aluminum-shell lithium power battery according to claim 1, wherein the positive tab (3) on the battery core package (1) is aluminum foil, and the negative tab (4) on the battery core package (1) is copper foil.

3. A high energy density prismatic aluminum can lithium power cell as claimed in claim 1 wherein said positive tab (3) is aligned with and in direct contact with positive post (5) and said negative tab (4) is aligned with and in direct contact with negative post (6).

4. A high energy density square aluminum can lithium power battery as claimed in claim 1, wherein the positive tab (3) is laser welded to the positive post (5) and the negative tab (4) is laser welded to the negative post (6).

5. The high energy density square aluminum-can lithium power battery as claimed in claim 1, wherein auxiliary solder strips are arranged between the positive tab (3) and the positive post (5) and between the negative tab (4) and the negative post (6).

6. The high energy density square aluminum-shell lithium power battery according to claim 5, characterized in that the auxiliary welding strip between the positive tab (3) and the positive post (5) is an aluminum strip (7), and the auxiliary welding strip between the negative tab (4) and the negative post (6) is a nickel strip (8).