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Charging method, electronic device and storage medium

A charging method and charging current technology, applied in battery circuit devices, circuit devices, secondary battery charging/discharging, etc., can solve the problems of prolonged constant voltage charging, long total battery charging time, shortening constant current charging time, etc. problem, achieve the effect of shortening the full charging time, shortening the constant voltage charging time, and improving the constant current charging time

Pending Publication Date: 2021-04-20
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, as the number of charging cycles and the use time of the battery increase, the impedance of the battery increases, which will shorten the time of constant current charging and prolong the time of constant voltage charging of the battery, resulting in the total charging time of the battery getting longer

Method used

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  • Charging method, electronic device and storage medium
  • Charging method, electronic device and storage medium
  • Charging method, electronic device and storage medium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0137] (1) Parameter U m set up

[0138] U during battery cycling m Change according to the following rules:

[0139] u m =U cl +b 1 ×m+b 2 , where U cl=4.45V, U cl is the cut-off voltage of the battery at the end of the constant current charging phase in the first charge-discharge cycle, 1≤m≤80, b 1 =0,b 2 =0; 81≤m≤500, b 1 =0.0002,b 2 =0.

[0140] (2) Charging process

[0141] Ambient temperature: 25°C;

[0142] Charging process:

[0143] Step 1: Obtain the current actual capacity Q of the battery;

[0144] Step 2: Use a constant current of 1.5C to charge the battery until the voltage of the battery reaches the cut-off voltage U m , U m Change with the number of cycles m according to the preset formula;

[0145] Step 3: Continue to use U m Charge the battery with a constant voltage until the total capacity of the battery is Q;

[0146] Step 4: Let the battery stand for 5 minutes;

[0147] Step 5: Discharge the battery with a constant current of 1.0C unti...

Embodiment 2

[0151] (1) Parameter U m set up

[0152] U during battery cycling m Change according to the following rules:

[0153] u m =U cl +b 1 ×m+b 2 , where U cl =4.45V, 1≤m≤80, b 1 =0,b 2 =0; 81≤m≤500, b 1 =0.0001,b 2 = 0.01.

[0154] (2) Charging process

[0155] Same as Example 1, except that the U set in Example 2 is used m .

Embodiment 3

[0157] (1) Parameter U m set up

[0158] U during battery cycling m Change according to the following rules:

[0159] In each loop, U m Take U and U cl The one with the larger value, where U=OCV 1 +(U cl -OCV 1 ) × k, U cl =4.45V, OCV 1 =4.10V, U cl and OCV 1 are the cut-off voltage and open-circuit voltage of the battery at the end of the constant current charging phase in the first charge-discharge cycle, and k is the impedance growth rate of the battery. It is necessary to collect the actual impedance of the battery at any time during the battery cycle and calculate the growth rate rate, k=R 2 / R 1 , R 2 is the battery impedance when SOC=50% in the m-1th charging process of the battery, R 1 It is the battery impedance when SOC=50% in the first charging process of the battery, and the value is R 1 =60mOhm;

[0160] (2) Charging process

[0161] Same as Example 1, except that the U set in Example 3 is used m .

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Abstract

A battery charging method, comprising: in an m-th charging and discharging cycle, performing constant-current charging on a battery with a charging current to a first cut-off voltage U m, wherein m is any two or more integers among 1, 2, 3,..., and x, and the values of U m in at least two charging and discharging cycles are different. The method can shorten the full charge time of a battery, and can also ensure that lithium precipitation and overcharge of the battery do not occur, thereby improving the service life of the battery.

Description

technical field [0001] The present application relates to the field of battery technology, and in particular to a battery charging method, an electronic device, and a storage medium. Background technique [0002] At present, the charging method commonly used on lithium batteries is to continuously charge the lithium ion battery to a certain voltage (for example, it can be a charging limit voltage) through a preset constant current, and then charge the lithium ion battery to a constant voltage at this voltage. fully charged state. In this case, as the number of charging cycles and the use time of the battery increase, the impedance of the battery increases, which will shorten the time of constant current charging and prolong the time of constant voltage charging of the battery, resulting in the total charging time of the battery longer and longer. Contents of the invention [0003] In view of this, it is necessary to provide a charging method, an electronic device and a s...

Claims

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Application Information

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IPC IPC(8): H02J7/00H01M10/44
CPCH01M10/44Y02E60/10H01M10/48H02J7/0048H02J7/00712H02J7/007182H02J7/00714H02J7/0049
Inventor 关婷朱珊吴飞
Owner NINGDE AMPEREX TECH
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