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A lithium-ion battery with high energy and high safety performance

A lithium-ion battery, safety performance technology, applied in battery electrodes, secondary batteries, secondary battery repair/maintenance, etc., can solve problems such as safety performance degradation, limit battery energy density, etc., to improve energy density and improve battery rate. performance, the effect of increasing cycle performance

Active Publication Date: 2022-04-01
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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  • A lithium-ion battery with high energy and high safety performance
  • A lithium-ion battery with high energy and high safety performance
  • A lithium-ion battery with high energy and high safety performance

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 electrode sheet, a separator, a positive electrode sheet laminated or a wound electric core, wherein the positive electrode sheet contains a positive electrode current collector, a positive electrode active material, and a positive electrode conductive agent. , positive electrode binder and positive electrode additive; the negative electrode sheet contains negative electrode current collector, negative electrode active material, negative electrode conductive agent, negative electrode binder and negative electrode additive; it is characterized in that: the coating layer on both sides of the surface of the positive electrode current collector is PTC material, Aluminum powder and carbon nanotubes; the positive electrode additive is a mixture of PTC material, aluminum powder and graphene; the coating layer on both sides of the positive electrode sheet is PTC material and graphene; the coating layer on both sides of the negative electrode current collector surface is PTC material , copper powder and carbon nanotubes; the negative electrode additive is a mixture of PTC material, copper powder and graphene; the coating layers on both sides of the negative electrode surface are PTC material and graphene. The invention obtains high safety performance, ensures safety and at the same time improves the energy density of the battery, improves the electrical performance of the battery and improves the level of the production process.

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 Patents(China)
IPC IPC(8): H01M4/66H01M10/0525H01M10/42
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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