Cylindrical lithium ion battery with over charging protective function and its preparing method

An overcharge protection, lithium-ion battery technology, applied in the field of lithium-ion batteries, can solve problems such as battery power failure and reduce battery transportation reliability, and achieve the effects of improving overcharge protection, shortening power-off time, and saving raw materials

Inactive Publication Date: 2007-06-27
TIANJIN LISHEN BATTERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, reducing the CID power-off pressure value can also protect the battery from overcharging, but since reducing the CID power-off pressure is achieved by reducing the welding force at the power-off connection, when the welding force of the solder joint is reduced, Although it can protect the battery from overcharging, it also reduces the reliability of battery transportation, making the battery prone to power failure and scrapping during mechanical vibration.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Injection amount experiment: the present invention comprises the battery of 1000-2600mAh capacity, and present embodiment is with the 18650 battery of 1800mAh as example, with 0.6MP air pressure (N 2 Atmosphere) lower sealing and normal pressure (0.1MP) sealing battery comparison. The battery liquid injection volumes are four kinds listed in Table 1, which are respectively injected into two groups of batteries with different sealing methods. After the battery undergoes 0.2C formation and 0.5C post-treatment, a 3.6A-18.5V overcharge safety experiment is performed. The specific method of the overcharge experiment is: charge the battery to 4.2V at a rate of 0.5C, wrap the battery with thermal insulation cotton with a thickness of 1.2-2cm after compression, and then charge the battery with a current of 3.6A. The upper limit voltage is set to 18.5V. The battery current, voltage, and shell surface temperature are collected in the middle. Experimental judgment standard: the ...

Embodiment 2

[0024] Different air pressure experiments: the present invention includes batteries with a capacity of 1000-2600mAh. This embodiment takes a 1800mAh 18650 battery as an example to compare batteries sealed under different air pressures. The liquid injection volume of the battery is 3.0g / Ah. After the battery is formed at 0.2C and post-treated at 0.5C, the overcharge experiment in Example 1 is carried out. Table 2 is the test results. It can be seen from the test results that with the increase of the sealing pressure, the overcharge safety of the battery is improved, but when the sealing pressure is greater than 1.0MP, the battery will be cut off during the formation period and scrapped.

[0025] Table 2

[0026] experiment number

Embodiment 3

[0028] Different gas experiments: the present invention includes batteries with a capacity of 1000-2600mAh. This embodiment is based on the 18650 battery with 1800mAh as an example. The liquid injection volume of the battery is 3.0g / Ah. 2 , Ar, CO 2 Gas and inert gas, etc., this embodiment is sealed under the atmosphere of A, B, and C with a pressure of 0.6MP. After the battery undergoes 0.2C formation and 0.5C post-treatment, the overcharge experiment in Example 1 is carried out. At the same time, the battery 1C rate charge and discharge cycle test was carried out. Table 3 shows the test results. From the test results, it can be seen that the type of pressurized gas selected has no adverse effect on the overcharge safety and cycle performance of the battery.

[0029] table 3

[0030] experiment number

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Abstract

This invention discloses a cylinder Li ionic cell with an overcharge protection function and its preparation method composed of a shell, a Li ionic negative set in the shell capable of being inserted and getting out and a positive containing Li metal oxide as the active substance and non-solution electrolyte with the content of 1.67-3.60g/Ah, and said shell is sealed by a closed high pressure method.

Description

technical field [0001] The invention relates to a lithium ion battery, in particular to a cylindrical lithium ion battery with an overcharge protection function and a preparation method thereof. Background technique [0002] Due to the advantages of high voltage, high specific energy, wide operating range, and environmental friendliness, lithium-ion batteries have become the most widely used means of energy storage. Cylindrical lithium-ion batteries, as one of the important members of the lithium-ion battery family, are used in a wide range of fields, such as laptop computers and power tools. At present, for the research of cylindrical lithium-ion batteries, while trying to improve its specific energy and cycle life, the safety performance of batteries has also attracted more and more attention. Among them, the fire and explosion of batteries caused by overcharging is One of the safety issues of cylindrical lithium-ion batteries needs to be solved urgently. [0003] Usuall...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/02H01M2/34H01M10/38H01M10/40H01M10/0525H01M10/058H01M50/107H01M50/578
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 王晓丹步绍宁王荣高俊奎
Owner TIANJIN LISHEN BATTERY
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