CN211404686U

CN211404686U - High-capacity battery with self-balanced temperature

Info

Publication number: CN211404686U
Application number: CN202020407575.6U
Authority: CN
Inventors: 许祎凡; 娄豫皖; 孟祎凡; 李紫璇
Original assignee: Shanghai Binei Information Technology Co ltd
Current assignee: Suzhou Yuan'an Energy Technology Co.,Ltd.
Priority date: 2020-03-26
Filing date: 2020-03-26
Publication date: 2020-09-01
Anticipated expiration: 2030-03-26

Abstract

The application relates to a high-capacity battery with self-balancing temperature, and belongs to the technical field of batteries. The device comprises positive and negative cover plates, an aluminum shell, a battery clamp, a positive bus sheet, a negative bus sheet, a plurality of cylindrical winding cores and a phase-change material rod; the cylindrical winding core consists of a winding core and a metal cylinder wrapping the winding core; the cylindrical winding core is of an electrode-lug-free structure, one end of the winding core is an anode aluminum foil, and the other end of the winding core is a cathode copper foil; be equipped with a plurality of cylinder in the aluminum hull and roll up the core, the cylinder rolls up the core positive terminal and welds with anodal bus bar piece, and the negative pole end welds with negative pole bus bar piece, so welds into a book core group, the phase change material stick sets up between the metal drum that the cylinder rolled up the core and with the metal drum welding together. Therefore, under the condition that the battery is continuously charged and discharged or is charged and discharged with high power, the phase-change material can quickly absorb a large amount of generated heat, and the effects of cooling and temperature equalization are simultaneously achieved in the battery.

Description

High-capacity battery with self-balanced temperature

Technical Field

The application relates to a high-capacity battery with self-balancing temperature, and belongs to the technical field of batteries.

Background

With the continuous expansion of the application range of the lithium ion battery, the lithium ion battery is widely applied to the field of vehicle-mounted and ship-mounted power. The demand of the power battery on the cruising ability is increased, and the continuous increase of the energy output ability of the energy storage battery on the battery requires that the lithium ion battery has higher capacity performance, namely, good energy density. Lead-acid batteries and cadmium-nickel batteries are mostly adopted in power and energy storage batteries in the traditional sense, and the two batteries have lower energy density and cannot meet the use requirements of high power and high energy density output. At present, in the field of power batteries, a small-capacity battery such as a 18650 or 26650 battery is mostly adopted to meet the energy output requirement through a plurality of series and parallel combination modes. The battery pack has the structural characteristics that the number of the single batteries of the battery pack is large, the volume energy density is not high, and the management control structure of the battery pack is complex. The commercial high-capacity lithium ion battery is mostly 50 Ah-100 Ah. The main difficulties limiting the further increase of the battery capacity are: a large-capacity battery generates considerable heat during charge and discharge. And the large capacity battery is great because three-dimensional size, and when in actual application, the inhomogeneous condition of battery internal temperature is very serious, is close to the liquid cooling face and keeps away from the temperature difference of liquid cooling face, or the liquid cooling face is great with the temperature difference of battery central point position, and the maximum temperature difference is up to 10 ~ 20 ℃ even (with battery thickness, capacity and charge-discharge multiplying power positive correlation). The inconsistency of the internal temperature of the high-capacity single battery can cause the reduction of the comprehensive performance of the battery and even bring about safety problems.

SUMMERY OF THE UTILITY MODEL

In order to solve the above problems, the present application proposes a temperature-equalized large-capacity battery.

The high-capacity battery with the self-balanced temperature comprises a positive and negative cover plate, an aluminum shell, a battery clamp (bracket), a positive bus sheet, a negative bus sheet, a plurality of cylindrical winding cores and a phase-change material rod;

the shape of the aluminum shell is not limited to a cylinder or a square, and can be designed into any required shape, and the shape of the aluminum shell is any required shape such as a hexagon, an ellipse, a cylinder or a square;

the cylindrical winding core consists of a winding core and a metal cylinder wrapping the winding core; the cylindrical winding core is of an electrode-lug-free structure, one end of the winding core is an anode aluminum foil, and the other end of the winding core is a cathode copper foil;

the aluminum shell is internally provided with a plurality of cylindrical winding cores, the positive ends of the cylindrical winding cores are welded with the positive bus bar piece, the negative ends are welded with the negative bus bar piece, and the winding core group is formed by welding.

The phase-change material rod is a sealing structure, the shell is made of metal, and the phase-change material is arranged in the shell. The phase change temperature of the material in the phase change material rod is preferably one temperature of 35-55 ℃.

And inserting a phase change material rod between the metal cylinders of the adjacent cylindrical winding cores, and welding the shell of the phase change material rod and the metal cylinders into a whole.

The specific manufacturing method of the high-capacity battery with balanced temperature comprises the following steps:

(1) the cylindrical winding core is of an electrode-lug-free structure, one end of the winding core is an anode aluminum foil, and the other end of the winding core is a cathode copper foil;

(2) welding a metal cylinder of the cylindrical roll core into a whole according to the shape of the aluminum shell;

(3) inserting a phase change material rod between the metal cylinders of the cylindrical winding cores, and welding the phase change material rod and the metal cylinders together;

(4) sequentially inserting the cylindrical roll cores into the metal cylinder;

(5) clamping the battery bracket at the negative end of the cylindrical winding core to fix the cylindrical winding core;

(6) welding the positive bus sheet with the positive end of the cylindrical winding core;

(7) welding the negative bus bar with the negative end of the cylindrical winding core;

(8) welding the positive cover plate and the positive bus bar;

(9) placing the assembled roll core group into an aluminum shell, and welding and sealing the positive cover plate and the aluminum shell;

(10) and welding a negative electrode cover plate and a negative electrode confluence sheet, wherein a negative electrode column, a liquid injection hole and an explosion-proof membrane are arranged on the negative electrode cover plate.

(11) And finally, welding and sealing the negative electrode cover plate and the aluminum shell.

(12) Drying the internal water;

(13) injecting liquid into the battery through the liquid injection port;

(14) opening formation (or closing formation after welding the explosion-proof valve);

(15) cleaning the liquid injection port and welding the explosion-proof valve.

The application has the following technical effects and advantages:

under the condition that the battery is continuously charged and discharged or is charged and discharged with high power, the phase-change material can quickly absorb a large amount of generated heat, and the effects of cooling and temperature equalization are simultaneously achieved in the battery.

Drawings

Fig. 1 is an exploded view of a temperature self-equalizing large capacity battery according to an embodiment of the present application.

Fig. 2 is a schematic view illustrating the structure of a winding core set used in the battery.

Detailed Description

The following detailed description of embodiments of the present application refers to the accompanying drawings. The following examples are intended to illustrate the present application but are not intended to limit the scope of the present application.

In the attached drawing, 1 is a negative cover plate, 3 is a negative bus bar, 4 is an aluminum shell, 5 is a battery clamp, 6 is a cylindrical winding core, 7 is a positive bus bar, 8 is a positive cover plate, and 9 is a phase-change material rod.

Fig. 1 is an exploded view of a temperature self-equalizing large capacity battery according to an embodiment of the present application. As shown in fig. 1, the high-capacity battery with self-temperature equalization designed in the present application includes positive and negative electrode cover plates 1,8, an aluminum case 4, a battery holder (support) 5, a positive electrode bus bar 7, a negative electrode bus bar 8, a plurality of cylindrical winding cores 6, and a phase-change material rod 9; the shape of the aluminum shell 4 is not limited to a cylinder or a square, and can be designed into any required shape, and the shape of the aluminum shell is any required shape of a hexagon, an ellipse, a cylinder or a square; the cylindrical winding core 6 consists of a winding core and a metal cylinder wrapping the winding core; the cylindrical winding core 6 is of a non-lug structure, one end of the cylindrical winding core 6 is an anode aluminum foil, and the other end of the cylindrical winding core 6 is a cathode copper foil; a plurality of cylindrical winding cores 6 are arranged in the aluminum shell 4, the positive end of each cylindrical winding core 6 is welded with the positive bus sheet 7, and the negative end of each cylindrical winding core 6 is welded with the negative bus sheet 3, so that a winding core group is formed by welding; the phase-change material rod 9 is a sealing structure, the shell is made of metal, and the phase-change material is arranged in the shell. The phase change temperature of the material in the phase change material rod 9 is preferably one temperature of 45-55 ℃.

Fig. 2 is a schematic view illustrating the structure of a winding core set used in the battery. As shown in fig. 2, a phase change material rod 9 is inserted between the metal cylinders of adjacent cylindrical jelly rolls 6, and the outer shell of the phase change material rod 9 is welded integrally with the metal cylinders. In fig. 2 is shown 4 phase change material rods 9 inserted between the metal cylinders of adjacent cylindrical jelly cores 6. The application is not so limited and one or more phase change material rods 9 may be inserted between the metal cylinders of adjacent cylindrical jelly rolls 6.

(4) sequentially inserting the cylindrical roll cores into the metal cylinder;

(8) welding the positive cover plate and the positive bus bar;

(12) Drying the internal water;

(13) injecting liquid into the battery through the liquid injection port;

(15) cleaning the liquid injection port and welding the explosion-proof valve.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application.

Claims

1. A high-capacity battery with self-balanced temperature comprises a positive and negative electrode cover plate, an aluminum shell, a battery clamp, a positive electrode bus sheet, a negative electrode bus sheet, a plurality of cylindrical winding cores and a phase-change material rod; the cylindrical winding core consists of a winding core and a metal cylinder wrapping the winding core; the cylindrical winding core is of an electrode-lug-free structure, one end of the winding core is an anode aluminum foil, and the other end of the winding core is a cathode copper foil; be equipped with a plurality of cylinder in the aluminum hull and roll up the core, the cylinder rolls up the core positive terminal and welds with anodal bus bar piece, and the negative pole end welds with negative pole bus bar piece, so welds into a book core group, the phase change material stick sets up between the metal drum that the core was rolled up to the cylinder.

2. The temperature self-equalized large capacity battery according to claim 1, wherein the aluminum can has any desired shape of a hexagon, an ellipse, a cylinder or a square.

3. The temperature self-equalized large capacity battery according to claim 1 or 2, wherein the phase change material rod itself is a sealed structure, the outer case is metal, and the phase change material is built in.

4. The temperature self-equalized large capacity battery according to claim 1 or 2, wherein the phase transition temperature of the material in the phase change material rod is one temperature of 35 to 55 ℃.

5. The temperature self-equalized large capacity battery according to claim 1 or 2, characterized in that the phase change material rod is inserted between the metal cylinders of the adjacent cylindrical jelly rolls, and the outer shell of the phase change material rod and the metal cylinders are welded as one body.

6. The temperature self-equalized large capacity battery according to claim 5, wherein the phase change material rod is one or more.