Negative plate with sandwich structure and lithium ion battery comprising negative plate

A negative electrode, negative electrode technology, applied in the direction of negative electrode, battery electrode, secondary battery, etc., can solve the problem of inability to take into account the safety of overcharge and furnace temperature, poor safety of acupuncture and furnace temperature, and the impact of battery cycle life, etc. problems, to avoid short circuits in large areas, improve overcharge performance, and improve the safety of acupuncture
CN112103486APending Publication Date: 2020-12-18ZHUHAI COSMX POWER CO LTD
4 Cites 2 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ZHUHAI COSMX POWER CO LTD
Publication Date
2020-12-18

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention provides a negative plate with a sandwich structure and a lithium ion battery comprising the negative plate. When a conventional lithium ion battery is subjected to a needling test, an internal short circuit occurs, a large amount of heat is generated in a short time due to relatively large current density of the internal short circuit, thermal shrinkage of a diaphragm is caused, andfinally thermal runaway of the battery is caused. A lithium titanate layer is contained in the negative plate, lithium can be rapidly removed at the moment of internal short circuit to form an air-state insulator, the resistance of the negative plate is sharply increased in the process, the short-circuit current can be reduced, and then the needling safety of the lithium ion battery can be improved. A silicon material layer is contained in the negative plate, lithium dendrites can be consumed through reaction when the silicon material layer makes contact with the lithium dendrites, the situation that the negative plate seriously separates out lithium to form a large number of lithium dendrites in the overcharge process of the battery cell is avoided, and internal short circuit caused by the fact that the lithium dendrites pierce a diaphragm is further avoided.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a negative electrode sheet with a sandwich structure and a lithium ion battery including the negative electrode sheet. Background technique

[0002] In recent years, with the intensification of the energy crisis and the deterioration of the natural environment, the application of lithium-ion batteries in the fields of electric vehicles and energy storage equipment has gradually attracted attention. However, due to the safety problems of lithium-ion power batteries, many electric vehicle And spontaneous combustion and explosion accidents of hybrid electric vehicles, which seriously restrict the promotion speed of lithium-ion batteries in the field of new energy.

[0003] The safety performance of batteries is usually verified by overcharging, furnace temperature and acupuncture tests. In order to improve the safety of the battery cell during the overchar...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More