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High-energy and high-safety lithium ion battery

A lithium-ion battery, safety performance technology, applied in the direction of battery electrodes, secondary batteries, secondary battery repair/maintenance, etc., can solve the problems of limiting battery energy density, safety performance degradation, etc., to improve battery rate performance and energy Density, the effect of ensuring the safety performance of anti-acupuncture

Active Publication Date: 2020-03-17
SUZHOU PHYLION BATTERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The increase of nickel content in the ternary can increase the discharge gram capacity of the material, which means that higher energy density can be achieved, but the safety performance will also decrease accordingly.
However, the thickness of the coating is 1-10 μm, which has reached or even exceeded the thickness of current collectors, which limits the improvement of battery energy density.

Method used

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  • High-energy and high-safety lithium ion battery
  • High-energy and high-safety lithium ion battery
  • High-energy and high-safety lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A high-energy and high-safety lithium-ion battery includes a battery core formed by stacking or winding a negative electrode sheet, a separator, and a positive electrode sheet.

[0036] See attached figure 1 The positive electrode sheet is composed of a positive electrode current collector foil 1 in the center, a positive electrode current collector coating 2 , a positive electrode slurry coating 3 , and a positive electrode surface coating 4 on both sides of the positive electrode current collector foil 1 . Among them, the positive electrode current collector foil 1 is made of aluminum foil, the positive electrode current collector coating 2 is composed of PTC materials, aluminum powder and carbon nanotubes, and the positive electrode slurry coating 3 is composed of positive electrode active materials, positive electrode conductive agents, positive electrode binders and positive electrode additives. constitute. See attached figure 2 , the positive electrode additive...

Embodiment 2

[0055] The VDA standard (DIN 91252-2016) square 2614891 size battery cell is selected, the battery capacity is 54Ah, the energy density is 230Wh / kg, and the positive electrode material is 811 ternary with the highest nickel content in commercialization. According to the "Safety Requirements and Test Methods for Traction Batteries for Electric Vehicles" (GB / T 31485-2015), the acupuncture test was carried out, and the test results are shown in Table 4, Table 5, Table 6, and Table 7.

[0056] It can be seen from Table 4 that due to the high-nickel positive electrode system, when the thickness of the surface coating of the current collector and the content of additives in the positive and negative electrodes are too low, even if the thickness of the surface coating of the positive and negative electrodes is increased by 2 μm on one side, the safety cannot be fully guaranteed. performance. It can be seen from Table 5 that when the thickness of one side of the surface coating of the...

Embodiment 3

[0068] After the coating and rolling of the electrode sheet in the lithium-ion battery, there will be a cutting process, which is mainly to cut off the excess exposed metal current collector to reduce its own weight and make room. Laser slicing is likely to cause high internal short circuit rate, self-discharge and inconsistency due to the phenomenon of molten beads, so the current mainstream of slitting is hardware die cutting and knife die slicing. The principle of metal die cutting and knife die slicing causes burrs after the current collector metal is cut. The existence of burrs affects the short circuit rate of the process, and ultimately affects the self-discharge of the battery, showing the inconsistency of the group.

[0069]The length and width of the surface coating of the current collector are both smaller than the length and width of the inner layer of the current collector, and larger than the length and width of the coating of the outer slurry (active material, co...

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Abstract

The invention discloses a lithium ion battery with high energy and high safety performance, which comprises a negative plate, a diaphragm and a battery cell formed by laminating or winding a positiveplate, and is characterized in that the positive plate contains a positive current collector, a positive active material, a positive conductive agent, a positive binder and a positive additive; the negative plate contains a negative current collector, a negative active substance, a negative conductive agent, a negative binder and a negative additive; the positive electrode current collector is characterized in that coating layers on two sides of the surface of the positive electrode current collector are made of a PTC material, aluminum powder and carbon nanotubes; the positive electrode additive is a mixture of a PTC material, aluminum powder and graphene; coating layers on the two sides of the surface of the positive plate are made of a PTC material and graphene; coating layers on the two sides of the surface of the negative electrode current collector are made of PTC materials, copper powder and carbon nanotubes; the negative electrode additive is a mixture of a PTC material, copperpowder and graphene; and coating layers on two sides of the surface of the negative plate are made of a PTC material and graphene. According to the invention, high safety performance is obtained, thesafety is ensured, the energy density of the battery is improved, the electrical performance of the battery is improved, and the production process level is improved.

Description

technical field [0001] The invention relates to a lithium ion battery, in particular to a lithium ion battery with high energy density and high safety performance. Background technique [0002] In the process of electric vehicles replacing traditional fuel vehicles, lithium-ion batteries play an important role. As one of the three electric systems of electric vehicles, the battery restricts the mileage and safety of electric vehicles. At present, the proportion of new energy vehicles in automobiles is still very small. The main reasons are that there are few charging piles, consumers' anxiety about cruising range, and safety. With the improvement of infrastructure such as charging stations and charging piles, the difficulty of charging has been solved in terms of hardware conditions. In the early days, in order to increase the mileage of electric vehicles, the state subsidized high-energy-density battery systems from the policy aspect. With the increase in the energy densi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139H01M10/0525H01M10/42
CPCH01M10/0525H01M4/667H01M4/663H01M10/4235Y02E60/10
Inventor 王永琛朱华君程凯王正伟
Owner SUZHOU PHYLION BATTERY
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