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Lithium ion secondary battery charging method

A secondary battery and charging method technology, which is applied in the direction of secondary battery charging/discharging, secondary battery repair/maintenance, battery electrodes, etc. The effect of shortening the time required for charging and suppressing heat generation

Active Publication Date: 2013-06-05
MAXELL HLDG LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in order to suppress the charging current during CC-b charging, the total charging time in the CC region becomes longer
In addition, the charging current at the time of CV charging decreases from the large current used to complete charging in a short time, and the charging time after CV charging is also increased

Method used

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  • Lithium ion secondary battery charging method
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  • Lithium ion secondary battery charging method

Examples

Experimental program
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Effect test

Embodiment approach 1

[0062] refer to figure 2 A charging method of the lithium ion secondary battery according to Embodiment 1 of the present invention will be described. exist figure 2 In , the horizontal axis represents time, and the vertical axis represents current, charging rate, and temperature.

[0063] This charging method basically belongs to the CCCV charging method. That is, CV charging is performed up to a predetermined set voltage Vc (voltage illustration is omitted), and from the time (tcv) when the set voltage Vc is reached, CV charging is performed while reducing the charging current to maintain the set voltage. Charge. At time tf when the charging current reaches the set value If, ​​the CV charging is stopped and the charging is completed.

[0064] This embodiment is characterized by the process of CC charging, such as figure 2 As shown, the time when the switching time ts has elapsed from the start of charging is set as the boundary, CC1 charging is performed at the initia...

Embodiment approach 2

[0082] The charging method of the lithium ion secondary battery of the second embodiment is substantially the same as that of the first embodiment. In this embodiment, the switching time ts1 of the first embodiment is replaced by the switching time ts2. therefore, figure 1 , figure 2 The content shown is common to this embodiment except for the switching time ts1, and the achieved effect is also the same as that of the first embodiment.

[0083] The switching time ts2 in this embodiment is set as follows. That is, for a lithium-ion secondary battery of the same specification as the charging target, charging is started from the state of charging rate 0%, and the charging time t until the change point Ta of the temperature rise gradient is detected is measured. TA .

[0084] If with charging time t TA The switching time ts2 is set correspondingly, and the switching time ts2 is set at the moment when the change point Ta appears. This makes it possible to switch from CC1 c...

Embodiment approach 3

[0091] The charging method of the lithium ion secondary battery of the third embodiment is substantially the same as that of the first embodiment. figure 1 , figure 2The contents shown are common to the present embodiment and are based on the same principle as that of the first embodiment. This embodiment differs from Embodiment 1 in that it includes a step of determining the state of charge of the lithium-ion secondary battery before starting charging, thereby further improving the effect of shortening the charging time.

[0092] The state of charge of the lithium-ion secondary battery is determined in order to detect whether the battery is in a state before the change point Ta or a state beyond the change point Ta in the temperature rise gradient of the battery under CC charging. Then, if the state of charge is the state before the change point Ta, CC charging is performed at the first current value from the start of charging until the above-mentioned switching time ts el...

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Abstract

CCCV charging is used to charge lithium ion secondary batteries having the characteristic that, in the CC charging period, there is a change point (Ta) in the temperature rise gradient of the battery accompanying progress of charging, and the temperature rise gradient in the initial segment T1 bounded by the change point (Ta) rises more sharply than the temperature rise gradient in a subsequent segment T2. A switching time ts is set in the range tT<=ts<=(tT*1.2) on the basis of the charging time tT which is measured in advance and corresponds to the point in time when the change point (Ta) occurs from the start of CC charging in a state in which the charging rate is 0%. In the CC charging period, CC charging is performed with a first current value from the start of charging until switching time ts has elapsed, and, after switching time ts has elapsed, CC charging is performed with a second current value greater than the first current value. For lithium ion secondary batteries using a negative electrode material containing Si, this charging method enables highly efficient charging while suppressing heat generation during charging.

Description

technical field [0001] The present invention relates to a charging method suitable for a lithium ion secondary battery configured using a negative electrode material containing silicon (Si). Background technique [0002] Lithium-ion secondary batteries, which are one type of non-aqueous electrolyte secondary batteries, are widely used with high voltage and high capacity, and various improvements have been made in their charging methods in order to use them more efficiently. As a charging method for lithium ion secondary batteries, constant current constant voltage (CCCV) is generally used. [0003] Such as Figure 6 CCCV charging is performed as shown. In this figure, the horizontal axis represents time, and the vertical axis represents voltage, current, and temperature. This figure shows changes in voltage and temperature when charging is performed by controlling the current as shown in the figure. Constant current (CC) charging is carried out at the initial stage of cha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/10H01M10/44H02J7/04
CPCH02J7/04Y02E60/12H02J7/0073H02J7/0052H01M4/134H01M10/44H02J7/0071Y02E60/10Y02P70/50H02J7/007194Y02B40/00H02J7/00Y02E60/13
Inventor 三浦和俊
Owner MAXELL HLDG LTD
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