Cylindrical coil core explosion-proof lithium ion battery and processing method

A technology of lithium-ion batteries and winding cores, applied in the field of explosion-proof lithium-ion batteries and processing of cylindrical winding cores, can solve the problems of unsatisfactory ion diffusion, poor insulation effect, easy short circuit, etc., and achieve excellent safety performance, low cost, and production The effect of simple process

Inactive Publication Date: 2013-01-02
SHANDONG TIANYANG NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The conventional separators used in current batteries are usually made of polyethylene and polypropylene. In actual use, there are defects such as poor insulation effect, easy short circuit, unsatisfactory ion diffusion and poor strength.

Method used

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  • Cylindrical coil core explosion-proof lithium ion battery and processing method
  • Cylindrical coil core explosion-proof lithium ion battery and processing method
  • Cylindrical coil core explosion-proof lithium ion battery and processing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1 includes a shell, an outer lug 1 , a cylindrical core 7 and an electrolyte. Among them: the cylindrical winding core 7 is composed of two winding core units connected in parallel, the two winding core units are clamped and fixed by two winding core auxiliary modules 8, the outer shell is made of aluminum-plastic film soft packaging bag 9, and two outer poles The ear 1 is sealed and bonded to the opening of the aluminum-plastic film soft packaging bag 9 , and the tabs 6 of all winding core units are connected to the outer tab 1 through the corresponding positive and negative current collectors 5 . The winding core auxiliary module 8 is made of PP material or soft rubber material resistant to electrolyte corrosion, and the preferred number of cylindrical winding cores 7 is 2-4. A tab fastening sheet 3 is prefabricated on the sealing surface of the outer tab 1 and the bag mouth of the aluminum-plastic film outer packaging bag 9, and the material is PP material...

Embodiment 2

[0027] Embodiment 2, with reference to accompanying drawing 2, on the basis of embodiment 1, described winding core auxiliary mold 8 is the rectangular parallelepiped structure that two pieces of winding core auxiliary modules 8 are combined along the axial direction of winding core, and its inside is provided with A cylindrical groove that is mated with the winding core 7. The two winding core auxiliary modules 8 are provided with mutually plugged protrusions 8-1 and grooves 8-2 on their mating surfaces, and the protrusions and grooves play a role in fixing the two winding core auxiliary modules. The winding core auxiliary module is provided with a through hole or a through groove 8-4 that runs through inside and outside, as a channel for injecting liquid into the battery core. Rolling core auxiliary module 8 is provided with slot 8-3 (corresponding to figure 1 In 4), the positive current collector and the negative current collector 5 are plugged and fixed in the correspondi...

Embodiment 3

[0028] Embodiment 3, with reference to attached image 3 , in combination with Embodiment 2, the winding core auxiliary module can also adopt a rectangular parallelepiped structure composed of two winding core auxiliary modules 8 along the outer periphery of the winding core 7, and an arc-shaped groove that is plugged and matched with the winding core 7 is provided inside. .

[0029] Preferably, the outer lug is a nickel or aluminum strip folded into an L shape, and the lower end is bent to facilitate welding with the positive and negative current collectors. In order to increase the sealing degree between the outer lug and the aluminum-plastic film packaging material, a layer of glue is applied to the contact between the outer lug and the aluminum-plastic film packaging material. The winding core auxiliary module can protect the winding core from being damaged by external forces such as extrusion force and collision force. At the same time, it also plays the role of auxil...

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Abstract

The invention discloses a cylindrical coil core explosion-proof lithium ion battery comprising a shell, outer pole lugs, a cylindrical coil core and electrolyte, wherein the cylindrical coil core is composed of a plurality of coil core units, which are connected in parallel, the plurality of coil core units are clamped and fixed by two auxiliary modules of coil core, the shell is packaged by an aluminum-plastic film flexible package bag, two outer pole lugs are hermetically adhered at the bag opening of the aluminum-plastic film flexible package bag, and the pole lugs of all coil core units are connected with the outer pole lugs through corresponding anode and cathode current collectors. The invention further discloses a processing method of the battery. The lithium ion battery and the processing method disclosed by the invention are simple in production technique and low in cost; the safety performance is excellent, and the battery explosion problem is solved; and the advantages of simple technique and high production efficiency of cylindrical coil core batteries are combined, so that the technique is mature and stable, the production cost is low and the production efficiency is high.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, in particular to an explosion-proof lithium ion battery with a cylindrical winding core of small and medium capacity and a processing method thereof. technical background [0002] Due to its high voltage, high energy density, good cycle performance and other advantages, lithium-ion batteries are increasingly used in the fields of energy storage and power. At present, the common lithium-ion batteries are mainly classified into metal-cased lithium-ion batteries and plastic-cased lithium-ion batteries according to the casing; the casings of the two types of batteries are made of hard materials, which can easily cause explosions if used improperly, and the outer packaging costs are high. From the classification of battery cells, there are mainly two types: winding type and laminated type; the disadvantage of the laminated type is that the process is complicated, the production cost is high, and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M2/16H01M10/0587
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 徐建贞朱玉法柳艾美孟庆帅
Owner SHANDONG TIANYANG NEW ENERGY
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