A fast charging method based on high temperature resistant lithium ion battery

A lithium-ion battery and fast charging technology, applied in the field of lithium-ion batteries, can solve problems such as failure of fast charging function, thermal runaway, reduction of charging power, etc., and achieve the effect of reducing charging waiting time, wide operating temperature range, and avoiding potential safety hazards.

Active Publication Date: 2021-07-30
商丘神风能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example: if the current changes from 1 to 2, the heat generated will increase by 4 times, and the temperature protection value of power reduction is generally set at 45 degrees to 50 degrees, which causes the high external environment temperature in summer, coupled with The heat generated by high-current charging causes the battery to heat up rapidly, and the temperature can quickly reach the temperature protection value to reduce the charging power. The fast charging function can only last for a short period of time, or it cannot be started at all in summer. The charging function is basically equal to failure. From the user's point of view, the waiting time for charging caused by fast charging will be greatly increased, which will further cause customer complaints and decline in satisfaction, and increase obstacles to the rapid popularization of electric vehicles.
[0004] The reason why the current lithium batteries cannot be charged and discharged at high temperatures is mainly because the current lithium batteries basically use liquid organic electrolytes, which are characterized by volatilization and Side reactions occur, and the internal components of the battery are vaporized, so that the battery electrolyte cannot react fully and effectively, changing the composition of the electrolyte between the positive and negative electrodes, increasing the internal resistance of the electrolyte and weakening all aspects of performance, thereby rapidly reducing the battery life. Severe and may even lead to the precipitation of lithium dendrites, causing a short circuit inside the battery and causing safety problems
At the same time, if the gas generated exceeds a certain amount, it will affect the performance of the battery. The most obvious is that the pouch battery will produce flatulence, and the square aluminum shell and cylindrical battery will cause the pressure relief valve to open, affecting the normal use of the battery.
If the temperature continues to rise, thermal runaway will occur, causing serious consequences such as fire and explosion

Method used

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  • A fast charging method based on high temperature resistant lithium ion battery
  • A fast charging method based on high temperature resistant lithium ion battery
  • A fast charging method based on high temperature resistant lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Taking the current 1C of normal fast charging as an example, during charging, the battery management system BMS (hereinafter referred to as BMS) collects the temperature and voltage data of the battery in real time, and adjusts the charging current according to the real-time voltage and temperature data, for example:

[0048] When the voltage is below 3.5V:

[0049] a) The charging current is 2C when the temperature is below 80°C;

[0050] b) The charging current is 1.5C when the temperature is above 80°C and below 85°C;

[0051] c) The charging current is 1C when the temperature is above 85°C and below 90°C;

[0052] d) Charging is not allowed when the temperature is above 90°C.

[0053] When the voltage is above 3.5V and below 4.0V:

[0054] a) The charging current is 1.5C when the temperature is below 80℃;

[0055] b) The charging current is 1C when the temperature is above 80°C and below 85°C;

[0056] c) The charging current is 0.5C when the temperature is abo...

Embodiment 2

[0073] This embodiment provides a method for preparing a high temperature resistant lithium-ion battery, the steps are as follows:

[0074] 1. Electrolyte preparation: Prepare the electrolyte in the glove box, which is filled with nitrogen with a purity of 99.999%, the moisture in the glove box is controlled at ≤5ppm, and the temperature is room temperature (23°C±1°C). Mix the solvent system with a mass ratio of DMC:DEC:EC=3:4:3 evenly, seal it, put it in the refrigerator until it cools down to 10°C, transfer it to the glove box, and then add it to LiPF 6 Fully mix to form a lithium salt molar concentration of 1mol / L in the non-aqueous electrolyte of the lithium battery, and then add n-butanol (CH 3 (CH 2 ) 3 OH), so that it contains 10ppm of n-butanol (CH 3 (CH 2 ) 3 OH) non-aqueous electrolyte, after uniform mixing, the non-aqueous lithium battery electrolyte is obtained.

[0075] 2. Preparation of lithium battery positive electrode: Prepare lithium battery positive el...

Embodiment 7-10

[0086] Replace n-butanol with additive n-hexanol.

[0087] The configuration and manufacturing method of Embodiment 7-10 are carried out with reference to the configuration and method of Embodiment 1.

[0088] As shown in table 2, each index and test result of the embodiment 7-10 that the present invention carries out are as shown in the table:

[0089] Table 2 is the comparison of electrolyte vaporization temperature data after adding different contents of n-hexanol additives

[0090]

[0091] The high-temperature-resistant lithium battery provided by the present invention, the electric vehicle produced by using the battery can have a wider working temperature range, and is more suitable for use in a high-temperature environment, which is specifically reflected in that it can carry out continuous high-current rapid charging in hot summer, improving The charging speed of electric vehicles reduces the waiting time for users to charge.

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Abstract

The invention discloses a fast charging method based on a high-temperature-resistant lithium-ion battery. The non-aqueous lithium-ion battery electrolyte of the high-temperature-resistant lithium-ion battery contains additives, and the additives are a class of hydroxyl (-OH) groups, One or more mixtures of organic or inorganic compounds with carboxyl (‑COOH) groups or aldehyde (‑CHO) groups. The ratio of the additive in the non-aqueous lithium battery electrolyte is 1-100ppm. The additive can inhibit the volatilization of organic solvent components in the electrolyte, thereby ensuring the use performance and safety performance of the battery under high temperature conditions. The present invention is mainly based on the above-mentioned high-temperature-resistant lithium-ion battery, and cooperates with the battery management system to enable the electric vehicle to be charged quickly and safely with a large current at high temperature, improve the overall charging speed, reduce the charging waiting time of customers, and improve customer satisfaction.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a fast charging method based on high temperature resistant lithium ion batteries. Background technique [0002] In recent years, due to environmental protection pressure and energy issues, countries are actively promoting new energy vehicles. Among new energy vehicles, pure electric vehicles are developing faster and faster, and their market share is also increasing. With the increase of pure electric vehicles, while the advantages of electric vehicles are becoming more and more obvious, their disadvantages are also gradually emerging, especially the slow charging speed and long waiting time, which have gradually become the biggest obstacles hindering the rapid popularization of electric vehicles. [0003] In response to this problem, major automobile manufacturers and battery manufacturers have successively introduced various fast charging technologies....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/44H01M10/0567H01M10/0525H01M10/058H01M10/42
CPCH01M10/0525H01M10/0567H01M10/058H01M10/4235H01M10/443H01M10/448Y02E60/10Y02P70/50
Inventor 潘青海陈娟韩卫东
Owner 商丘神风能源科技有限公司
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