Charging method of secondary battery with constant current using high charge rate
First Claim
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1. A charging method of a secondary battery comprising:
- a first charging step of charging the secondary battery at a first C-rate from an initial charge voltage to a first charge voltage; and
a second charging step of charging the secondary battery to a target voltage while gradually decreasing a C-rate within a range not exceeding the first C-rate after the voltage of the secondary battery reached the first charge voltage,wherein the first C-rate of the first charging step is 6 C,wherein the gradual decreasing of the C-rate in the second charging step comprises stepwise decreasing the C-rate in proportion to a charge time,wherein the decreasing of the C-rate comprises stepwise decreasing the C-rate within a range from 3 C to 1 C,wherein the first charge voltage has a range from 4.080 V to 4.090 V, andwherein the target voltage has a range from 4.090 V to 4.100 V within a range equal to or greater than the first charge voltage.
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Abstract
Disclosed herein is a charging method of a secondary battery including a first charging step of charging the secondary battery at a first C-rate from an initial charge voltage to a first charge voltage and a second charging step of charging the secondary battery to a target voltage while gradually decreasing a C-rate within a range not exceeding the first C-rate after the voltage of the secondary battery reached the first charge voltage. Consequently, it is possible to prevent deterioration of the battery, thereby improving lifespan characteristics of the battery.
19 Citations
6 Claims
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1. A charging method of a secondary battery comprising:
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a first charging step of charging the secondary battery at a first C-rate from an initial charge voltage to a first charge voltage; and a second charging step of charging the secondary battery to a target voltage while gradually decreasing a C-rate within a range not exceeding the first C-rate after the voltage of the secondary battery reached the first charge voltage, wherein the first C-rate of the first charging step is 6 C, wherein the gradual decreasing of the C-rate in the second charging step comprises stepwise decreasing the C-rate in proportion to a charge time, wherein the decreasing of the C-rate comprises stepwise decreasing the C-rate within a range from 3 C to 1 C, wherein the first charge voltage has a range from 4.080 V to 4.090 V, and wherein the target voltage has a range from 4.090 V to 4.100 V within a range equal to or greater than the first charge voltage. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification