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Battery self-adaptive quick charging method

A fast charging and self-adaptive technology, applied in secondary battery charging/discharging, battery circuit devices, secondary battery repair/maintenance, etc., can solve the problems of shortened life, shortened fast charging time, no obvious changes, etc., to achieve increased Effects of service life, improvement of economy and safety, and reduction of charging time

Inactive Publication Date: 2014-08-13
SHANGHAI CENAT NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. The driving mileage is relatively short, and the driving mileage of one stock is less than 200km
[0005] 2. The charging speed is slow, and the charging time for one charge is 5-7 hours
At present, the commonly used charging method for batteries is the method of constant current to constant voltage and current limiting. This method takes a long time to charge, and the charging time for one charge is more than three hours, which cannot achieve the purpose of fast charging.
In addition, increasing the charging current can achieve the purpose of fast charging, but there will be side reactions inside the battery, which will have a great impact on the performance of the battery. The battery is actually charged with less power
In addition, there is also an increase in the charging voltage to compensate for the voltage drop generated by various impedances of the battery during the charging process to achieve the purpose of fast charging. The overall fast charging time of the battery has not been significantly shortened.
[0008] Therefore, the marketization of electric vehicles urgently needs to find a charging method that can increase the charging current of the battery without changing the structure and performance of the battery itself, and at the same time does not cause damage to the battery, so as to overcome the current battery performance change caused by constant current and large current charging. poor defect

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0043] The battery adaptive fast charging method in this embodiment includes the following steps:

[0044] Step 1: Place the battery to be charged in an incubator at a constant temperature for more than 5 hours, and set the temperature of the incubator at 25±3°C.

[0045] Step 2: Discharge the battery to be charged at a constant current according to the standard current to the cut-off voltage specified by the manufacturer.

[0046] Step 3: Place the battery to be charged in an incubator at a constant temperature for more than 5 hours, and set the temperature of the incubator to 25±3°C.

[0047] Step 4: Charge the battery according to the standard current and constant current to the cut-off voltage specified by the manufacturer, and collect the battery voltage and charging capacity change data at the same time. The ambient temperature for constant current charging is 20-30°C, and the standard charging current is 1 / 3C.

[0048] Step 5: Make a graph of the collected voltage data...

Embodiment 2

[0053] In order to further illustrate the present invention, in this embodiment, according to the charging setting process of the existing lithium-ion battery, a 26Ah ternary material vehicle lithium-ion battery is taken as an example, which includes the following steps:

[0054] Step 1: Place the battery in a thermostat for 5 hours, and set the temperature of the thermostat to 25±3°C.

[0055] Step 2: Discharge the battery at a constant current to a cut-off voltage of 3.0V, and the discharge current is 8.7A.

[0056]Step 3: Let the battery stand still in the incubator for 5 hours, and set the temperature of the incubator at 25±3°C.

[0057] Step 4: Charge the battery according to the standard current and constant current to the cut-off voltage 4.15V specified by the manufacturer, and collect the battery voltage and charging capacity change data at the same time. The charging current is 8.7A, the charging cut-off voltage is 4.15V, and the constant current charging environment ...

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Abstract

The invention provides a battery self-adaptive quick charging method which comprises the following steps: step one, carrying out constant-current charging on a battery by a battery standard charging current, and acquiring battery capacity data and battery voltage data; step two, converting the capacity data and the voltage data into a relation equation about the battery capacity and the voltage; step three, converting the relation equation, to obtain a relation curve of battery charging capacity changes and voltage changes; and step four, according to the battery voltage changes, outputting a corresponding charging current according to the relation curve. With utilization of a characteristic that the battery has different charging current demands in different states, the charging current multiplying power is improved, so that the charging current adapts to the maximum current demand of the battery in a charge state, the charging speed is improved, the charging time is shortened, and the purpose of quick charging is achieved.

Description

technical field [0001] The invention relates to the technical field of battery charging and discharging, in particular to a battery self-adaptive fast charging method. Background technique [0002] With the increasing depletion of oil and the gradual enhancement of people's awareness of environmental protection, electric vehicles with the advantages of high efficiency, energy saving and zero emission have attracted much attention. This is the main direction for the development of energy-saving and environmentally friendly vehicles, and it is also the direction for the future development of the automobile industry. [0003] Due to the limited energy space design and complex driving conditions of electric vehicles, there are high requirements for the energy density, power density and temperature characteristics of batteries. The existing batteries cannot fully meet the needs of electric vehicles. Compared with electric vehicles, electric vehicles mainly have the following disa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/44
CPCH01M10/44H02J7/00Y02E60/10
Inventor 于洪涛陈中军和祥运赵豪星刘风磊陈沥强邓亚明葛祥梁荣嵘李艳曹建航王慧景张海林陈慧珺
Owner SHANGHAI CENAT NEW ENERGY
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