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High energy density fast charging type lithium ion power battery

A high energy density, power battery technology, applied in batteries, secondary batteries, battery electrodes, etc., can solve the problems of inability to meet the requirements of battery life, low energy density, and insignificant improvement in energy density, and achieves increased lithium intercalation. The effect of reaction area, high energy density, and rapid diffusion

Pending Publication Date: 2019-04-26
SHENZHEN BAK POWER BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The lithium battery has a fast charging effect, but the energy density is still low, which cannot meet the requirements of the current new energy vehicles for battery life.
The application number is 201510100893.1, which is a Chinese invention patent titled "A Fast Charging Back Clip Mobile Battery", which optimizes the battery's electrochemical system and cell structure, and improves the charging speed of the battery, but the increase in energy density is not obvious

Method used

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  • High energy density fast charging type lithium ion power battery
  • High energy density fast charging type lithium ion power battery
  • High energy density fast charging type lithium ion power battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] 1. Preparation of Li-ion power battery.

[0041] In this embodiment, a cylindrical 18650-3500mAh lithium-ion power battery is prepared, including a positive pole piece, a negative pole piece, a diaphragm, an electrolyte and battery auxiliary materials, wherein the positive pole piece, the diaphragm and the negative pole piece are wound together into a roll core, The winding core is placed inside the casing, and the roller groove is tested for internal short circuit, baked at 80°C for 24 hours, injected with electrolyte, sealed, then cleaned the casing, and coated with thermoplastic film. The cell is aged for 12 hours to obtain the finished cell. Then make the finished battery.

[0042] In this embodiment, the positive electrode sheet includes a positive electrode material layer, and the formula of the positive electrode sheet is composed of the following components: LiNi 0.92 co 0.05 al 0.03 o 2 (0.2C gram capacity 200mAh / g) ternary material (conductive carbon laye...

Embodiment 2

[0053] 1. Preparation of Li-ion power battery.

[0054] In this example, a square 2614891-52Ah lithium-ion power battery is prepared, including a positive electrode sheet, a negative electrode sheet, a separator, an electrolyte, and battery auxiliary materials, wherein the positive electrode sheet, the separator, and the negative electrode sheet are wound together into a core, and the core is multiple Tab design, the winding core is placed inside the shell, the internal short circuit is tested, baked at 80°C for 24 hours, the electrolyte is injected, the opening is formed, the seal is laser welded, and then the shell is cleaned. The cells are aged for 12 hours to obtain finished cells, and then made into finished batteries.

[0055] In this embodiment, the positive electrode sheet includes a positive electrode material layer, and the formula of the positive electrode sheet is composed of the following components: LiNi 0.80 co 0.15 al 0.05 o 2 (0.2C gram capacity 180mAh / g) ...

Embodiment 3

[0066]1. Preparation of Li-ion power battery.

[0067] In this example, a soft pack 2014891-40Ah lithium-ion power battery is prepared, including a positive electrode sheet, a negative electrode sheet, a diaphragm, an electrolyte, an aluminum-plastic film, and battery auxiliary materials, wherein the positive electrode sheet, the diaphragm, and the negative electrode sheet are wound together into a roll core , the winding core is placed inside the aluminum-plastic film, the internal short circuit is tested, baked at 80°C for 24 hours, injected with electrolyte, and sealed twice. The cell is aged for 12 hours to obtain the finished cell.

[0068] In this embodiment, the positive electrode sheet includes a positive electrode material layer, and the formula of the positive electrode sheet is composed of the following components: LiNi 0.80 co 0.15 Al 0.05 o 2 (0.2C gram capacity 180mAh / g) ternary material (conductive carbon layer coating modification), the dosage is 97.5wt%; t...

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Abstract

The invention discloses a high energy density fast charging type lithium ion power battery. The composition of positive and negative pole materials, positive and negative pole pieces, a conductive agent, a diaphragm and an electrolyte are designed. The positive and negative pole materials are modified; the positive and negative pole pieces are designed as multi-lead or all-lead with a void structure; the conductive agent is designed as a 'point-line-face' conductive network; the diaphragm and an electrolyte formula are improved. The lithium ion power battery thus designed has high energy density, and the energy density can reach 260 Wh / kg or more; the charging speed is also greatly improved, and the electric quantity of 80% or more can be changed in 15 minutes without lithium depositing; the battery has good cycle performance, and the capacity retention ratio is greater than 80% after 1500 cycles at the charge-discharge rate of +0.5C / -1C.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery design, in particular to a high-energy-density fast-charging lithium-ion power battery. Background technique [0002] With the increasing contradiction between energy consumption and social development, new energy has become the focus of research because of its environmental protection and renewable advantages. Among them, new energy vehicles have become a strategic emerging industry in my country and are facing unprecedented development opportunities and challenges. Battery life is one of the core issues currently plaguing the new energy vehicle market. The survey report of the China Association of Automobile Manufacturers shows that if the cruising range of new energy vehicles can reach 300-400 kilometers, and the charging speed is increased to charge more than 80% of the electricity within 15 minutes, then the market sales of new energy vehicles will achieve leapfrog growth . Therefore, hi...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M4/36H01M4/525H01M4/505H01M4/485H01M4/38H01M4/62H01M10/058
CPCH01M4/366H01M4/386H01M4/485H01M4/505H01M4/525H01M4/625H01M10/0525H01M10/058H01M2220/20Y02E60/10Y02P70/50
Inventor 易先文宋华杰梁庆生徐建兵
Owner SHENZHEN BAK POWER BATTERY CO LTD
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