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A battery cell of a secondary battery and a preparation method of the battery cell

A secondary battery and cell technology, which is applied in the manufacture of secondary batteries, battery electrodes, and electrolyte batteries, can solve the problems of high power consumption and high cost, achieve guaranteed performance, good industrialization potential, and slow down charging performance. poor effect

Active Publication Date: 2018-12-11
NANTONG JIANGHAI CAPACITOR CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The improvement method includes the use of low-temperature-resistant additives for the lithium-ion battery itself to improve its low-temperature charging performance, but essentially does not change the effect of low temperature, but uses a low-temperature resistant electrolyte
In addition, heat preservation measures are adopted at the lithium-ion battery module or system level, which not only consumes a lot of power, but also costs a lot

Method used

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  • A battery cell of a secondary battery and a preparation method of the battery cell
  • A battery cell of a secondary battery and a preparation method of the battery cell

Examples

Experimental program
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Effect test

Embodiment 1

[0031] A battery cell of a secondary battery, comprising a positive electrode sheet, a negative electrode sheet, a separator and an electrolyte, the separator is arranged between the positive electrode sheet and the negative electrode sheet, and both the positive electrode sheet and the negative electrode sheet Including a porous current collector 1, each of which is provided with an NTC material body 102;

[0032] Each hole 101 of the porous current collector 1 is provided with the NTC material body 102, and the NTC material body 102 is seamlessly fixedly connected with the inner wall of the hole 101 of the porous current collector 1; the present invention combines the NTC material body 102 is pressed in the pores 101 of the porous positive and negative current collectors, which not only ensures low-temperature heating characteristics, but also does not occupy the space of the secondary battery itself, and does not cause battery performance degradation due to the addition of N...

Embodiment 2

[0036] Such as figure 1 : a battery core of a secondary battery, comprising a positive electrode sheet, a negative electrode sheet, a separator and an electrolyte, the separator is arranged between the positive electrode sheet and the negative electrode sheet, the positive electrode sheet and the negative electrode sheet Both include a porous current collector 1, and each of the porous current collectors 1 is provided with an NTC material body 102;

[0037] Each hole 101 of the porous current collector 1 is provided with the NTC material body 102, and the NTC material body 102 is seamlessly fixedly connected with the inner wall of the hole 101 of the porous current collector 1; the present invention combines the NTC material body 102 is pressed in the pores 101 of the porous positive and negative current collectors, which not only ensures low-temperature heating characteristics, but also does not occupy the space of the secondary battery itself, and does not cause battery perf...

Embodiment 3

[0050] Such as figure 1 Shown: a battery cell of a secondary battery, comprising a positive electrode sheet, a negative electrode sheet, a separator and an electrolyte, the separator is arranged between the positive electrode sheet and the negative electrode sheet, the positive electrode sheet and the negative electrode sheet The negative plates all include a porous current collector 1, and each of the porous current collectors 1 is provided with an NTC material body 102;

[0051]Each hole 101 of the porous current collector 1 is provided with the NTC material body 102, and the NTC material body 102 is seamlessly fixedly connected with the inner wall of the hole 101 of the porous current collector 1; the present invention combines the NTC material body 102 is pressed in the pores 101 of the porous positive and negative current collectors, which not only ensures low-temperature heating characteristics, but also does not occupy the space of the secondary battery itself, and does...

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Abstract

The invention discloses a battery cell of a secondary battery, comprising a positive electrode sheet, a negative electrode sheet, an isolation film and an electrolyte, wherein the isolation film is arranged between the positive electrode sheet and the negative electrode sheet, the positive electrode sheet and the negative electrode sheet all comprise a porous current collector, and each porous current collector is provided with an NTC material body; Each pore of the porous current collector is provided with an NTC material body, and the NTC material body is seamlessly and fixedly connected with the pore inner wall of the porous current collector; The invention relates to a preparation method of a cell, comprising the following steps of: softening an NTC material body by sintering, and pressing the NTC material body in each pore of a porous current collector by cold pressing; Finally, the porous current collector containing NTC material is fabricated into a pole piece. Placing an isolation film, injecting an electrolyte, and assembling the electrolyte into a cell; As that low-temperature heat characteristic is ensured, the battery performance is not reduce due to the addition of theNTC material, and the space can be saved; The invention can not only keep the secondary battery in the heating state for a long time under the low temperature, but also make the secondary battery exert its performance.

Description

technical field [0001] The invention relates to the technical field of secondary batteries, in particular to an electric cell of a secondary battery and a preparation method of the electric cell. Background technique [0002] High voltage and high specific energy are the current development direction of lithium-ion batteries, and the accompanying safety issues, especially the requirements for thermal safety issues, are getting higher and higher. [0003] It is understood that the performance of lithium-ion batteries attenuates severely at low temperatures, including problems such as a drop in discharge voltage, a drop in discharge capacity, and an increase in internal resistance. Compared with low-temperature discharge, the performance of low-temperature charging of lithium-ion batteries is even more unsatisfactory. First, charging at low temperature will quickly reach the constant voltage stage, which will reduce the charging capacity to a certain extent and increase the ch...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M4/66H01M4/80H01M10/058
CPCH01M4/665H01M4/80H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 孟海军杨恩东邵国柱
Owner NANTONG JIANGHAI CAPACITOR CO LTD
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