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Method for improving safety of lithium ion secondary battery

A secondary battery, lithium-ion technology, applied in the field of lithium-ion batteries, can solve problems such as adverse effects on battery electrochemical performance, lower battery energy density, and inability to protect battery from overcharge, so as to prevent overcharge and thermal runaway and ensure contact tightness effect

Active Publication Date: 2013-10-02
DONGGUAN AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, in the publication number CN 102800868A, it is proposed to add copper oxide or cuprous oxide to the positive pole piece. When the battery is overcharged, the copper oxide or cuprous oxide will act, causing the battery voltage to drop to a lower voltage state and It can be maintained for a long time, but this method will reduce the energy density of the battery, especially when the overcharge rate is large; in addition, it is also a common practice to use the redox shuttle to develop the internal anti-overcharge mechanism of the battery. Such as LiI and ferrocene, 2,5-di-tert-butyl-1,4-dimethoxybenzene (Battery Technology. 36, 172, (2012)) etc.
This method can cope with the situation of small rate overcharge, but at the same time it will lose the electrochemical performance of the battery; when a large rate overcharge occurs, due to the limitation of solubility, migration rate and electrochemical performance, the redox couple will Will expose the inherent defect of insufficient current clamping capability to provide adequate overcharge protection for the battery
In addition, other common related technologies include voltage-sensitive diaphragm (Journal of Wuhan University (Natural Science Edition). 52, 149 (2006)) and internal short-circuit additive (Power Technology. 32, 603 (2008)), the former is subject to the preparation process The selection of redox pairs with cost and suitable voltage, the difficulty of the latter lies in the adverse effect on the electrochemical performance of the battery and the ability to cope with overcharge at a large rate

Method used

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  • Method for improving safety of lithium ion secondary battery
  • Method for improving safety of lithium ion secondary battery
  • Method for improving safety of lithium ion secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1, Such as figure 1 As shown, a method for improving the safety of lithium-ion secondary batteries includes the following steps: Step 1. Use two very flat steel metal sheets (length 80mm, width 40mm, and thickness 0.5 mm) with screw holes 4 at both ends. 1) It can be made to uniformly press the surface of the lithium ion secondary battery 2 and facilitate the adjustment of the clamp piece 3 with a small pressure; step two, arrange the clamp piece 3 on the upper and lower surfaces of the lithium ion secondary battery 2, and then place the clamp piece 3 Both ends are fixedly connected with devices 1 (including mobile phones, tablet computers, notebook computers, navigators, and mobile routers, etc.) using lithium ion secondary batteries 2 through screws. This embodiment uses a tablet computer.

[0022] The shape of the clamp piece 3 is rectangular, and the longitudinal direction of the clamp piece 3 is perpendicular to the extension direction of the tab 5 of the lith...

Embodiment 2

[0025] Example 2, Such as figure 2 As shown, a method for improving the safety of lithium-ion secondary batteries includes the following steps: Step 1. Use two very flat copper foils with screw holes 4 at both ends (length 91mm, width 50mm, and thickness 1 mm). 1) It can be made to uniformly press the surface of the lithium ion secondary battery 2 and facilitate the adjustment of the clamp piece 3 with a small pressure; step two, arrange the clamp piece 3 on the upper and lower surfaces of the lithium ion secondary battery 2, and then place the clamp piece 3 Both ends are fixedly connected with devices 1 (including mobile phones, tablet computers, notebook computers, navigators, and mobile routers, etc.) using lithium ion secondary batteries 2 through screws. This embodiment uses a tablet computer.

[0026] Preferably, the shape of the clamp piece 3 is rectangular, the longitudinal direction of the clamp piece 3 is parallel to the extension direction of the tabs 5 of the lithium...

Embodiment 3

[0029] Example 3, Such as image 3 As shown, a method for improving the safety of lithium-ion secondary batteries includes the following steps: Step 1. Use two very flat iron metal flakes (length 70mm, width 35mm, thickness 1.2 mm) to make lithium ion The surface of the secondary battery 2 is uniformly pressed, and it is convenient to adjust the clamping piece 3 with a small pressure; step two, dispose the clamping piece 3 on the upper and lower surfaces of the lithium ion secondary battery 2, and then connect the two ends of the clamping piece 3 with the use of lithium ion The equipment 1 of the secondary battery 2 (including mobile phones, tablet computers, notebook computers, navigators, mobile routers, etc.) is fixed by glue bonding, and a mobile phone is used in this embodiment.

[0030] Preferably, the shape of the clamp piece 3 is rectangular, the long side direction of the clamp piece 3 is at an acute angle with the extension direction of the tab 5 of the lithium ion seco...

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Abstract

The invention belongs to the field of lithium ion batteries and relates to a method for improving safety of a lithium ion secondary battery. The method comprises the following steps of 1, making clamp pieces which can uniformly apply pressure to the surface of a lithium ion secondary battery and is convenient for pressure adjustment, and 2, arranging the clamp pieces on upper and lower surfaces of the lithium ion secondary battery and fixedly connecting the clamp pieces and a device adopting the lithium ion secondary battery. Under the over-charge condition, the clamp pieces apply appropriate pressure to the surface of the lithium ion secondary battery so that a part of or all the lithium ion secondary battery always keeps good internal interface conditions and thus under the over-charge condition, contact tightness of negative and positive pole membranes and an isolating membrane is guaranteed and effective electronic channels in the lithium ion secondary battery are formed smoothly. Therefore, voltage is controlled in a safe range so that over-charge thermorunaway is avoided thoroughly.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, in particular to a method for improving the safety of lithium ion secondary batteries. Background technique [0002] Lithium-ion secondary batteries have been widely used in the industry due to their advantages such as high specific capacity, high working voltage, wide working temperature range, low self-discharge rate, long cycle life, no pollution and light weight. With the increasing demand for lithium-ion secondary batteries, related safety accidents are frequently reported, and overcharge accidents are also common. How to improve the safety performance has become the research focus of lithium-ion secondary batteries. [0003] Overcharging, as a common phenomenon of battery abuse, has been extensively studied. When the voltage rises to a certain level during the overcharging process, the structure of the positive electrode material of the battery will be destroyed, the electrolyte soluti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/42H01M10/44
CPCY02E60/10
Inventor 何立兵汪颖陈治杨帆谢远森胡佳佳
Owner DONGGUAN AMPEREX TECH
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