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Packaging method for reducing poor insulation of soft package lithium battery

A soft-pack lithium battery and packaging method technology, which is applied in the field of lithium batteries, can solve the problems of affecting the safety and electrical performance of soft-pack batteries, damage to the PP layer of aluminum-plastic film, and failure to discharge in time, so as to avoid the problem of lithium analysis, The effect of reducing the size of the air bag and saving the amount

Inactive Publication Date: 2021-03-26
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The local adhesion between the two layers of aluminum-plastic film outside the sealing area, during the subsequent processing and use of the soft-packed lithium-ion battery, due to the action of external forces, it is very easy to cause damage to the PP layer of the aluminum-plastic film in the adhesion area, resulting in soft-packed lithium-ion batteries. The electrolyte of the battery cell is in contact with the aluminum layer of the aluminum-plastic film, resulting in poor insulation of the battery cell
Especially when the soft-packed lithium-ion battery is formed, the battery produces gas, the air bag expands, and the aluminum-plastic film adhesion area near the top seal o

Method used

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  • Packaging method for reducing poor insulation of soft package lithium battery
  • Packaging method for reducing poor insulation of soft package lithium battery
  • Packaging method for reducing poor insulation of soft package lithium battery

Examples

Experimental program
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Effect test

Embodiment 1

[0039] In this embodiment, the specific steps of the encapsulation method with the reserved air guide port for the pouch battery are as follows:

[0040] S1. Complete the punching of the aluminum-plastic film 1 with a thickness of 152um on the punching machine to form a cell pit 1-1 and an air bag pit 1-2, both of which are 4mm deep, such as figure 2 shown;

[0041] S2, heat-resistant coating coating, such as image 3 Shown: a. On the outside of cell pit 1-1, polyacrylate polymer coating 2-1 is sprayed on the PP layer along the edge of the top seal, with a thickness of 3um and a width of 10mm; b. On the outside of cell pit 1-1, along the side The PP layer on the edge of the seal area and the second seal area is sprayed with polyacrylate polymer materials to form heat-resistant coating 2-2, heat-resistant coating 2-3, thickness 3um, width 2mm; c, air bag pit 1-2 On the outside, spray polyacrylate polymer material along the edge of the top seal area to form a heat-resistant c...

Embodiment 2

[0048]In this embodiment, the specific steps of the encapsulation method with the reserved air guide port for the pouch battery are as follows:

[0049] S1. Complete the punching of the aluminum-plastic film 1 with a thickness of 152um on the punching machine to form a cell pit 1-1 and an air bag pit 1-2, both of which are 4mm deep, such as figure 2 shown;

[0050] S2, heat-resistant coating coating, such as Figure 6 Shown: a, the outside of the cell pit body, spray polyacrylate polymer material along the edge of the top seal to form a heat-resistant coating 2-1, with a thickness of 3um and a width of 10mm; b, the outside of the cell pit body, along the side The PP layer of the seal area and the edge of the second seal area is sprayed with polyacrylate polymer materials to form heat-resistant coatings 2-2, 2-3, with a thickness of 3um and a width of 2mm. And carry out UV cross-linking and curing treatment on the sprayed polymer coating to form a heat-resistant curing layer...

Embodiment 3

[0057] In this embodiment, the specific steps of the encapsulation method with the reserved air guide port for the pouch battery are as follows:

[0058] S1. Complete the punching of the aluminum-plastic film 1 with a thickness of 152um on the punching machine to form a cell pit 1-1 and an air bag pit 1-2, both of which are 4mm deep, such as figure 2 shown;

[0059] S2, heat-resistant coating coating, such as Figure 7 Shown: On the outside of the cell pit 1-1, spray polyacrylate polymer material along the edge of the top seal area to form a coating 2-1 with a thickness of 3um and a width of 10mm; Combined curing treatment to form a heat-resistant cured layer;

[0060] S3. Assemble the welded battery cells into the pit, and perform top sealing along the outer edge of the coating according to the top sealing process conditions of 185°C pressure 0.3Mpa and time 1.8s to form a top seal 5-1, according to 180°C pressure 0.3Mpa time 1.2 s Side sealing process conditions for side...

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Abstract

The invention provides a packaging method for reducing poor insulation of a soft package lithium battery. The packaging method comprises the following step of: S1, carrying out pit punching on an aluminum-plastic film to form a battery cell pit and an air bag pit; S2, coating the inner side of the aluminum-plastic film heat sealing region with a heat-resistant coating, and subjecting the heat-resistant coating to cross-linking curing treatment; S3, putting the welded battery cell into a battery cell pit, and carrying out top sealing and side sealing on the edge of the outer side of the heat-resistant coating to form a top sealing stamp and a side sealing stamp; S4, baking the battery cell, and performing primary sealing after liquid injection to form a primary seal; S5, performing batterycell formation, and performing air exhaust secondary sealing after aging to form a secondary seal; and S6, trimming and folding the battery cell. The inner side edge of the heat sealing region is coated with the heat-resistant coating, so that adhesion of an aluminum-plastic film PP layer in the heat affected region can be effectively prevented during heat sealing of the battery cell, the PP layeris prevented from being damaged during subsequent production and use of the soft package battery cell, and the proportion of poor insulation is reduced.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a packaging method for reducing poor insulation of soft-pack lithium batteries. Background technique [0002] Compared with lithium-ion batteries such as traditional steel shells and aluminum shells, the soft-pack lithium-ion battery has flexible design, the shape of the battery cell can be arbitrary, the energy density is higher, and the safety of the battery is better. When a safety problem occurs, the soft-pack lithium Ion batteries are generally flattened and cracked, and are not prone to explosion. [0003] The pouch battery achieves the sealing effect by heat-sealing the aluminum-plastic film. Generally, high-temperature hot-pressing is used for heat-sealing. In the temperature range of 150-200°C, the PP layer of the aluminum-plastic film is melted, and the two layers are pressed together. Aluminum-plastic film PP layers are laminated together to complete the hea...

Claims

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Application Information

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IPC IPC(8): H01M10/058H01M10/052H01M10/0525
CPCH01M10/058H01M10/052H01M10/0525Y02E60/10Y02P70/50
Inventor 王从周曹勇王义飞苏峰滕威卢兵荣
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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