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Lithium ion battery

A lithium-ion battery and cell technology, applied in secondary batteries, battery components, circuits, etc., can solve disadvantages and other problems, achieve timely response, improve safety performance, and ensure safety performance

Active Publication Date: 2013-09-11
DONGGUAN AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This hysteresis is very detrimental to the safety performance of lithium-ion batteries

Method used

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Examples

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Embodiment 1

[0021] Example 1, Such as Figure 1~5 As shown, a lithium-ion battery includes a packaging bag, a battery cell 1 contained in the packaging bag, a thermal fuse 3 arranged on the surface of the battery cell 1, and an electrolyte poured into the packaging bag. The battery cell 1 includes a positive electrode diaphragm 15. The negative electrode diaphragm 17 and the separator 16 arranged between the positive electrode diaphragm 15 and the negative electrode diaphragm 17, the front end of the cell 1 is provided with a positive electrode tab 11 and a negative electrode tab 12, and the front end of the cell 1 is also provided with a The safety tab 13 is in contact with the thermal fuse 3 , and the safety tab 13 is arranged at the positive tab 11 of the battery cell 1 .

[0022] Preferably, the temperature fuse 3 is provided with a temperature sensing device 31 .

[0023] One end of the safety tab 13 is located inside the cell 1 and fixed to the isolation film 16, and the other en...

Embodiment 2

[0027] Example 2, The difference from Embodiment 1 is that the material of the safety tab 13 in this embodiment is Ni, and the safety tab 13 is arranged at the negative tab 12 of the battery cell 1 .

[0028] Others are the same as in Embodiment 1 and will not be repeated here.

Embodiment 3

[0029] Example 3, The difference from Embodiment 2 is that the material of the safety tab 13 in this embodiment is Cu, and the safety tab 13 is arranged at the center of the battery cell 1 .

[0030] Others are the same as in Embodiment 2 and will not be repeated here.

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Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a lithium ion battery which comprises a packaging bag, a cell held in the packaging bag, a temperature fuse arranged on the surface of the ell, and an electrolyte filled in the packaging bag, wherein the cell comprises a positive pole diaphragm, a negative pole diaphragm and an isolation diaphragm arranged between the positive pole diaphragm and the negative pole diaphragm, a positive pole lug and a negative pole lug are arranged at the front end of the cell, and a safety lug is arranged at the front end of the cell, and is in contact connection with the temperature fuse. The safety lug is not conducted with the battery but is directly conducted with a temperature sensing device of the temperature fuse, and thus the temperature inside the battery is transmitted to the temperature fuse in real time, and the temperature fuse is enabled to be consistent with the temperature inside the battery, and when the temperature reaches the acting temperature of the temperature fuse, a circuit is immediately cut off, the thermal runaway caused by temperature delay is avoided, and the safety property of the battery is ensured.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to a lithium ion battery. Background technique [0002] Lithium-ion batteries have become one of the most widely used secondary batteries due to their advantages such as high energy density, good cycle performance, high operating voltage, and no memory effect. However, safety issues have always been an important factor restricting the further development of lithium-ion batteries, especially lithium-ion batteries for electric vehicles. [0003] During the charging and discharging process of the lithium-ion battery, due to the electrochemical reaction and the internal resistance of the battery itself, it is easy to generate heat. If the heat cannot be released in time, it will accumulate together. If the heat accumulates for a long time, it may cause the battery to overheat, or even thermal runaway, thereby affecting the electrochemical performance and safety performanc...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M2/26H01M2/34
CPCY02E60/10
Inventor 华斌
Owner DONGGUAN AMPEREX TECH
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