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Flexible battery pack and manufacturing method thereof

A technology of flexible battery pack and manufacturing method, which is applied in secondary battery manufacturing, battery pack components, and isolation of batteries from their environment, etc., can solve the problems of decreased bonding strength, great difficulty, poor reliability, etc. High strength and fatigue resistance, improved bending ability, and the effect of being conducive to flexibility

Active Publication Date: 2017-02-08
DONGGUAN AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the flexible battery pack of this design is bent, due to the strong rigidity of the top layer and the bottom layer, the bending degree and fatigue strength of the flexible battery pack are greatly limited due to the influence of stress, which affects the performance of the flexible battery pack. After a certain bending angle and bending times, the bonding strength of the adhesive will decrease, resulting in poor reliability, and fatigue will easily occur in the non-bonding area close to the adhesive due to the inconsistent force, which is harmful to flexibility. The safety performance of the battery pack is at risk
Moreover, this method needs to control the bonding strength of the adhesive and the uniformity of the amount used in each area, and it is very difficult to mass produce

Method used

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  • Flexible battery pack and manufacturing method thereof
  • Flexible battery pack and manufacturing method thereof
  • Flexible battery pack and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Embodiment 1 (with reference to Figure 1 to Figure 7 setting method)

[0049] Set six punching pits 2 on the aluminum-plastic film 1, the length of the punching pits 2 is 2 mm longer than the length of the battery cell 31, the width of the punching pits 2 is 1.5 mm larger than the width of the battery cell 31, and the thickness of the punching pits 2 is larger than that of the battery cell 31. The thickness of 31 is 0.4 mm smaller; the distance between two adjacent punching pits 2 is 3 cm. Then, the battery cells 31 with a water content of 300 ppm are placed in the flushing pit 2 at intervals. Fold the other side of the aluminum-plastic film 1 in half to this side, leaving a 4cm length of the air bag G, and perform side sealing on each punching pit 2, the side sealing temperature is 195°C, the side sealing time is 20s, and the side sealing The pressure is 1MPa; inject LiPF containing lithium salt 6 and the liquid electrolyte of ethylene carbonate as a solvent for to...

Embodiment 2

[0050] Embodiment 2 (with reference to Figure 1 to Figure 7 setting method)

[0051] Set six punching pits 2 on the aluminum-plastic film 1, the length of the punching pits 2 is 3mm longer than the length of the battery cell 31, the width of the punching pits 2 is 2.5mm larger than the width of the battery cell 31, and the thickness of the punching pits 2 is larger than that of the battery cell 31. The thickness of 31 is 0.5mm smaller; the distance between two adjacent punching pits 2 is 3.5cm. Then, the wound electric cores 31 with a water content of 250 ppm are placed into the flushing pit 2 at intervals. Fold the other side of the aluminum-plastic film 1 in half to this side, leaving a 5cm length of the air bag G, and perform side sealing on each punching pit 2, the side sealing temperature is 165°C, the side sealing time is 2s, and the side sealing The pressure is 0.2MPa; inject LiPF containing lithium salt 6 The top-sealing temperature is 165°C, the top-sealing time i...

Embodiment 3

[0052] Embodiment 3 (with reference to Figure 1 to Figure 7 setting method)

[0053] Six punching pits 2 are set on the aluminum-plastic film 1, the length of the punching pits 2 is 2.5 mm longer than the length of the battery cell 31, the width of the punching pits 2 is 2 mm larger than the width of the battery cell 31, and the thickness of the punching pits 2 is larger than that of the battery core 31. The thickness of 31 is 0.45mm smaller; the distance between two adjacent punching pits 2 is 4cm. Then, the laminated battery cells 31 with a water content of 200 ppm are placed in the flushing pit 2 at intervals. Fold the other side of the aluminum-plastic film 1 to this side, leaving a length of air bag G of 4.5cm, and perform side sealing on each punching pit 2, the side sealing temperature is 180°C, the side sealing time is 10s, and the side sealing time is 10s. The sealing pressure is 0.6MPa; inject LiPF containing lithium salt 6 After the gel electrolyte with solvent ...

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Abstract

The invention provides a flexible battery pack and a manufacturing method thereof. The flexible battery pack includes: an aluminum-plastic film with a plurality of punching pits along the width direction; a plurality of batteries, each battery is hermetically arranged in each punching pit of the aluminum-plastic film, and each battery has a battery cell, a positive electrode tab and Negative pole tabs and injected electrolyte, the positive pole tabs of the plurality of batteries are connected together, the negative pole tabs of the multiple batteries are connected together, and adjacent batteries are isolated from each other; and a plurality of pieces of silica gel, Each silica gel is bonded to the aluminum-plastic film on the side of the punching pit of the adjacent battery on both sides and the aluminum-plastic film between the punching pits of two adjacent batteries through glue. The silicone used can improve the bending ability of the battery pack, which can improve the safety of the batteries in the flexible battery pack. At the same time, the aluminum-plastic film is equipped with silica gel, and the stress release during deformation is transmitted from the silica gel to the aluminum-plastic film, so the final force on the aluminum-plastic film is reduced, which is more conducive to the flexibility of the battery pack.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a flexible battery pack and a manufacturing method thereof. Background technique [0002] Due to the many advantages of lithium-ion batteries, such as high voltage, small size, light weight, high specific capacity, no memory effect, no pollution, small self-discharge and long cycle life, etc., its application in the field of mobile devices has been unprecedented. development, including mobile phones, video cameras, notebook computers, and other portable appliances. With the development of technology for mobile and convenient devices and the increase in demand therefor, the demand for secondary batteries as energy sources is rapidly increasing. Among such secondary batteries, studies on lithium secondary batteries having high energy density and discharge voltage have been widely conducted, and are now widely used. [0003] With the interest of consumers, electronic equipment tends to be...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/10H01M10/04H01M50/204H01M50/238H01M50/24
CPCH01M10/0436H01M2220/30H01M50/209H01M50/24Y02E60/10Y02P70/50
Inventor 周华利游从辉方宏新
Owner DONGGUAN AMPEREX TECH