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Secondary cell charging method

A charging method and technology for secondary batteries, which are applied in the charging/discharging of secondary batteries, repair/maintenance of secondary batteries, and battery circuit devices, etc., can solve the deterioration of battery cycle life, the influence of cathode structure stability, and the increase of cathode potential, etc. problem, to achieve the effect of improving cycle performance, reducing polarization effect, and reducing polarization potential

Inactive Publication Date: 2018-03-16
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This charging method will make the cathode potential continue to rise, especially in the constant voltage charging stage, the cathode will continue to maintain a high potential, which will affect the stability of the cathode structure and deteriorate the battery cycle life. When the charging process is carried out in a high temperature environment , will aggravate the deterioration of the battery cycle life

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The concrete steps of embodiment 1 are as follows:

[0037] 1) Set a set of successively decreasing charging current values ​​{1.5C, 1.3C, 1C, 0.8C, 0.5C, 0.2C, 0.1C}, and a set of discharging current values ​​{0.02C, 0.015C, 0.01C, 0.01 C,0.01C,0.01C,0C}, a set of charging time values ​​{9.5s, 9.5s, 9.5s, 9.5s, 9s, 9s, 8s}, and a set of discharging time values ​​{0.5s, 0.5s, 0.5 s, 0.5s, 0.2s, 0.2s, 0.1s}; set the charging cut-off voltage to 4.45V; place the battery in an environment of 45°C to charge and discharge the battery;

[0038] 2) Charge with a current of 1.5C for 9.5s, then discharge with a current of 0.02C for 0.5s,

[0039] 3) Repeat step 2) until the battery voltage reaches 4.45V;

[0040] 4) Charge with a current of 1.3C for 9.5s, then discharge with a current of 0.015C for 0.5s,

[0041] 5) Repeat step 4) until the battery voltage reaches 4.45V;

[0042] 6) Charge with a current of 1C for 9.5s, then discharge with a current of 0.01C for 0.5s,

[004...

Embodiment 2

[0055]The concrete steps of embodiment 2 are as follows:

[0056] 1) Set a set of successively decreasing charging current values ​​{5C, 1.5C, 1C, 0.5C, 0.2C}, a set of discharging current values ​​{0.2C, 0.03C, 0.02C, 0.01C, 0.01C}, a A set of charging time values ​​{1s, 30s, 5s, 5s, 2s}, and a set of discharging time values ​​{0.01s, 5s, 0.5s, 0.5s, 0.1s}; set the charging cut-off voltage to 4.45V, and the charging cut-off current to 0.05C; place the battery in an environment of 45°C to charge and discharge the battery;

[0057] 2) Charge with a current of 5C for 1s, then discharge with a current of 0.2C for 0.01s,

[0058] 3) Repeat step 2) until the battery voltage reaches 4.45V;

[0059] 4) Charge with a current of 1.5C for 30s, then discharge with a current of 0.03C for 5s,

[0060] 5) Repeat step 4) until the battery voltage reaches 4.45V;

[0061] 6) Charge with a current of 1C for 5s, then discharge with a current of 0.02C for 0.5s,

[0062] 7) Repeat step 6) unt...

Embodiment 3

[0069] The concrete steps of embodiment 3 are as follows:

[0070] 1) Set a set of successively decreasing charging current values ​​{1.5C, 1.4C, 1.3C, 1.2C, 1.1C, 1.0C, 0.9C, 0.8C, 0.7C, 0.6C, 0.5C, 0.4C, 0.3 C,0.2C,0.1C}, a set of discharge current values ​​{0.05C,0.05C,0.05C,0.05C,0.05C,0.05C,0.05C,0.05C,0.05C,0.05C,0.05C,0.02C ,0.02C,0C,0.01C}, a set of charging time values ​​{10s, 10s, 10s, 10s, 10s, 10s, 10s, 10s, 10s, 10s, 10s, 5s, 5s, 5s, 0.1s}, and a Group discharge time value {1s,1s,1s,1s,1s,1s,1s,1s,1s,1s,1s,1s,1s,1s,0.01s}. Set the charging cut-off voltage to 4.45V; place the battery in an environment of 45°C to charge and discharge the battery;

[0071] 2) Charge with a current of 1.5C for 10s, then discharge with a current of 0.05C for 1s,

[0072] 3) Repeat step 2) until the battery voltage reaches 4.45V;

[0073] 4) Charge with a current of 1.4C for 10s, then discharge with a current of 0.05C for 1s,

[0074] 5) Repeat step 4) until the battery voltage rea...

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Abstract

The invention discloses a secondary cell charging method. The secondary cell charging method comprises the following steps: setting a group of charging current values which are reduced in order, a group of discharge current values, a group of charging time values, and a group of discharge time values, and setting charging cut-off voltage V0 and charging cut-off current Im; using the set charging current value, the charging time value, the discharge current value, and the discharge time value for pulse charging on a cell according to a setting rule in order, and stopping charging or stopping charging by charging to the cut-off current Im by V0 constant voltage after the cell voltage reaches V0. Compared with the prior art, a mode that the large positive pulse current which is gradually reduced step by step cooperates with small negative pulse current or a standing charging mode is used, polarized influence brought by large pulse current charging is obviously reduced, cell cathode polarized potential is reduced, cycle performance of a cell high-voltage system is obviously improved, especially high-temperature cycle performance, and the usage life of the cell is effectively prolonged.

Description

technical field [0001] The invention belongs to the technical field of batteries, and more specifically, the invention relates to a method for charging a secondary battery. Background technique [0002] The existing secondary battery charging method is: use a constant current to continuously charge the battery to a certain potential, and then charge the battery at a constant voltage at this potential. This charging method will make the cathode potential continue to rise, especially in the constant voltage charging stage, the cathode will continue to maintain a high potential, which will affect the stability of the cathode structure and deteriorate the battery cycle life. When the charging process is carried out in a high temperature environment , will aggravate the deterioration of the battery cycle life. [0003] In view of this, it is necessary to provide a secondary battery charging method that can solve the above problems. Contents of the invention [0004] The objec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/44H02J7/00
CPCH01M10/44H02J7/007Y02E60/10
Inventor 高潮骆福平方占召袁庆丰余红明龚美丽
Owner NINGDE AMPEREX TECH
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