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A method for improving the safety of lithium-ion secondary batteries

A secondary battery, lithium ion technology, applied in the field of lithium ion batteries, can solve the problems of reducing battery energy density, adverse effects of battery electrochemical performance, loss of battery electrochemical performance, etc., to ensure contact tightness and prevent overcharge and heat. The effect of runaway phenomena

Active Publication Date: 2017-10-10
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 also lose the electrochemical performance of the battery; and when there is a large-rate overcharge, due to the limitation of solubility, migration rate and electrochemical performance, the redox couple will be damaged. 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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  • A method for improving the safety of lithium-ion secondary batteries
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  • A method for improving the safety of lithium-ion secondary batteries

Examples

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Effect test

Embodiment 1

[0021] Example 1, such as figure 1 As shown, a method for improving the safety of a lithium-ion secondary battery comprises the following steps: Step 1, using two very smooth steel metal sheets (80 mm long, 40 mm wide, and 0.5 mm thick) with screw holes 4 at both ends ) to make a clamp piece 3 that can uniformly apply pressure to the surface of the lithium-ion secondary battery 2 and conveniently adjust the pressure; step 2, 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 the device 1 (including mobile phone, tablet computer, notebook computer, navigator and mobile router, etc.) using the lithium-ion secondary battery 2 through screws, and a tablet computer is used in this embodiment.

[0022] The shape of the clamp piece 3 is rectangular, and the long side direction of the clamp piece 3 is perpendicular to the extension direction of the tab 5 of the lithium-...

Embodiment 2

[0025] Example 2, such as figure 2 As shown, a method for improving the safety of lithium-ion secondary batteries comprises the following steps: Step 1, using two very flat copper metal sheets (91 mm in length, 50 mm in width, and 1 mm in thickness) with screw holes 4 at both ends. ) to make a clamp piece 3 that can uniformly apply pressure to the surface of the lithium-ion secondary battery 2 and conveniently adjust the pressure; step 2, 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 the device 1 (including mobile phone, tablet computer, notebook computer, navigator and mobile router, etc.) using the lithium-ion secondary battery 2 through screws, and a tablet computer is used in this embodiment.

[0026] Preferably, the shape of the clamp piece 3 is rectangular, and the long side direction of the clamp piece 3 is parallel to the extension direction of the...

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, using two iron metal sheets with very flat surfaces (70mm in length, 35mm in width, and 1.2mm in thickness) to make lithium-ion Apply pressure evenly on the surface of the secondary battery 2, and conveniently adjust the pressure of the fixture piece 3; step 2, arrange the fixture piece 3 on the upper and lower surfaces of the lithium ion secondary battery 2, and then connect the two ends of the fixture piece 3 with the lithium ion battery. The device 1 of the secondary battery 2 (including mobile phone, tablet computer, notebook computer, navigator and mobile router, etc.) is bonded and fixed by glue, and a mobile phone is used in this embodiment.

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

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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 Patents(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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