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Method for preparing lithium ion battery pack

A lithium-ion battery pack and lithium-ion battery technology, which is applied in secondary batteries, battery electrodes, secondary battery manufacturing, etc., can solve problems such as limited service life, limited battery functions, and large capacity differences, and achieve enhanced Wetting performance, effect of enhancing anti-overcharge performance

Inactive Publication Date: 2021-09-03
杭州医培云科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the use of the battery pack, due to the different speeds of battery life attenuation, after a period of use, the capacity difference between the battery cells is large, causing the capacity of some batteries to decline faster and faster, resulting in battery failure. Limited function, limited service life

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1) Vacuum drying the assembled lithium-ion batteries;

[0035] 2) Inject an electrolyte solution accounting for 72% of the total electrolyte volume; the electrolyte contains dioctylphenyl phosphate as an additive, and the concentration of the dioctylphenyl phosphate in the electrolyte is 1.2% by volume;

[0036] 3) 0.1C constant current charging to a first predetermined voltage; the first predetermined voltage is 3.85V;

[0037] 4) Constant voltage charging with the first predetermined voltage until the charging current is lower than the cut-off current by 0.01C;

[0038] 5) At an ambient temperature of 25 degrees Celsius, charge the battery at a constant current of 1C to a charge cut-off voltage of 4.25V;

[0039] 6) Measure the surface temperature of the battery; record the charging quantity of the battery voltage rising from the first predetermined voltage to the charging cut-off voltage of 4.25V for the first time;

[0040] 7) If the surface temperature of the bat...

Embodiment 2

[0048] 1) Vacuum drying the assembled lithium-ion batteries;

[0049] 2) Inject an electrolyte solution accounting for 75% of the total electrolyte volume; the electrolyte contains dioctylphenyl phosphate as an additive, and the concentration of the dioctylphenyl phosphate in the electrolyte is 1.0% by volume;

[0050] 3) 0.1C constant current charging to a first predetermined voltage; the first predetermined voltage is 3.82V;

[0051] 4) Constant voltage charging with the first predetermined voltage until the charging current is lower than the cut-off current by 0.01C;

[0052] 5) At an ambient temperature of 25 degrees Celsius, charge the battery at a constant current of 1C to a charge cut-off voltage of 4.25V;

[0053] 6) Measure the surface temperature of the battery; record the charging quantity of the battery voltage rising from the first predetermined voltage to the charging cut-off voltage of 4.25V for the first time;

[0054]7) If the surface temperature of the batt...

Embodiment 3

[0062] 1) Vacuum drying the assembled lithium-ion batteries;

[0063] 2) Inject an electrolyte solution accounting for 74% of the total electrolyte volume; the electrolyte contains dioctylphenyl phosphate as an additive, and the concentration of the dioctylphenyl phosphate in the electrolyte is 1.1% by volume;

[0064] 3) 0.1C constant current charging to a first predetermined voltage; the first predetermined voltage is 3.84V;

[0065] 4) Constant voltage charging with the first predetermined voltage until the charging current is lower than the cut-off current by 0.01C;

[0066] 5) At an ambient temperature of 25 degrees Celsius, charge the battery at a constant current of 1C to a charge cut-off voltage of 4.25V;

[0067] 6) Measure the surface temperature of the battery; record the charging quantity of the battery voltage rising from the first predetermined voltage to the charging cut-off voltage of 4.25V for the first time;

[0068] 7) If the surface temperature of the bat...

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Abstract

The invention provides a method for preparing a lithium ion battery pack, and the method comprises the following steps: carrying out vacuum drying on a plurality of assembled lithium ion batteries, injecting part of electrolyte, carrying out constant-current charging to a first preset voltage, and carrying out constant-voltage charging at the first preset voltage until the charging current is lower than a cut-off current, performing constant-current charging on the battery to a charging cut-off voltage, measuring the surface temperature of the battery, and recording the charging electric quantity of the battery voltage rising from the first preset voltage to the charging cut-off voltage for the first time; determining to inject a first supplementary electrolyte or a second supplementary electrolyte according to the temperature value; recording the charging electric quantity of the battery voltage rising from the first preset voltage to the charging cut-off voltage for the second time, and recording the capacity of each battery; and assembling the batteries of which the difference percentage of the charging constants and the capacity difference percentage are within preset values into one group to form a battery pack. The battery pack prepared by the method disclosed by the invention is high in service life performance and good in consistency between single batteries.

Description

technical field [0001] The invention relates to a method for preparing a lithium-ion battery pack. Background technique [0002] Lithium-ion battery packs are assembled with batteries with similar capacities in order to keep the electrochemical performance of the batteries consistent during the cycle, so as to avoid overcharging or over-discharging of some batteries and ensure the performance of the battery pack. However, during the use of the battery pack, due to the different speeds of battery life attenuation, after a period of use, the capacity difference between the battery cells is large, causing the capacity of some batteries to decline faster and faster, resulting in battery failure. Limited function, limited service life. Contents of the invention [0003] The invention provides a method for preparing a lithium-ion battery pack, the method comprising: vacuum-drying a plurality of assembled lithium-ion batteries, injecting part of the electrolyte, charging with a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M4/62H01M10/44H01M10/42H01M10/04H01M10/0525B07C5/344
CPCH01M10/0567H01M4/623H01M10/446H01M10/4235H01M10/04H01M10/0525B07C5/344Y02P70/50Y02E60/10
Inventor 徐兴强
Owner 杭州医培云科技有限公司
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