Selection method for regenerative battery in battery pack

A technology for regenerating batteries and battery packs, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems of damaged battery pack performance, high cost, and complicated detection devices, so as to reduce battery internal resistance and restore battery capacity. , the effect of accurate testing

Active Publication Date: 2019-11-12
泰州纳新新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] For high-power power sources, several battery cells are usually connected in series or in parallel to form a battery pack, and the performance degradation of any battery cell in the battery pack will lead to serious damage to the performance of the entire battery pack, and even cause battery damage. Security out of control and other issues
Therefore, it is necessary to monitor the battery cells in the battery pack in time, and select the battery whose working condition has declined in time. However, in the existing system, the detection device is relatively complicated and the cost is high

Method used

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  • Selection method for regenerative battery in battery pack

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Experimental program
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Effect test

Embodiment 1

[0036] The operation method of the battery pack, including the following selection and regeneration process, after the regeneration process, the test work of the battery pack is carried out to obtain the test data:

[0037] 1) Charge the single battery with 5mA to the first cut-off voltage of 3.0V; charge with 12mA to the second cut-off voltage of 4.0V; during the charging process, measure the SOC (%) of the battery synchronously, and perform time normalization on the increase of SOC to obtain the SOC increase rate dΔSOC+ / dΔt;

[0038] 2) Discharge at 20mA to the third cut-off voltage of 2.5V; during the discharge process, measure the SOC (%) of the battery synchronously, normalize the SOC reduction with time, and obtain the SOC decline rate dΔSOC- / dΔt;

[0039] 3), taking the average value of the obtained SOC increase rate and / or SOC decrease rate of each single battery as a reference value;

[0040] 4), use the battery whose SOC increase rate and / or SOC decrease rate is hig...

Embodiment 2

[0045] The operation method of the battery pack, including the following selection and regeneration process, after the regeneration process, the test work of the battery pack is carried out to obtain the test data:

[0046] 1) Charge the single battery with 8mA to the first cut-off voltage of 3.3V; charge with 16mA to the second cut-off voltage of 4.35V; during the charging process, measure the SOC (%) of the battery synchronously, and perform time normalization on the increase of SOC to obtain the SOC increase rate dΔSOC+ / dΔt;

[0047] 2) Discharge at 26mA to the third cut-off voltage of 2.6V; during the discharge process, measure the SOC (%) of the battery synchronously, normalize the SOC reduction with time, and obtain the SOC decline rate dΔSOC- / dΔt;

[0048] 3), taking the average value of the obtained SOC increase rate and / or SOC decrease rate of each single battery as a reference value;

[0049] 4), use the battery whose SOC increase rate and / or SOC decrease rate is hi...

Embodiment 3

[0054] The operation method of the battery pack, including the following selection and regeneration process, after the regeneration process, the test work of the battery pack is carried out to obtain the test data:

[0055] 1) Charge the single battery with 10mA to the first cut-off voltage of 3.6V; charge with 18mA to the second cut-off voltage of 4.5V; during the charging process, measure the SOC (%) of the battery synchronously, and perform time normalization on the SOC increase to obtain the SOC increase rate dΔSOC+ / dΔt;

[0056] 2) Discharge at 28mA C to the third cut-off voltage of 2.8V; during the discharge process, measure the battery SOC (%) synchronously, and perform time normalization on the SOC reduction to obtain the SOC decline rate dΔSOC- / dΔt;

[0057] 3), taking the average value of the obtained SOC increase rate and / or SOC decrease rate of each single battery as a reference value;

[0058] 4), use the battery whose SOC increase rate and / or SOC decrease rate i...

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Abstract

The invention provides a selection method for a regenerative battery in a battery pack. The single battery in the battery pack is charged and discharged according to different cut-off voltages, different charging efficiency and output capacity are acquired according to the different deterioration degrees of the batteries, and finally the regenerative battery is selected through measuring the differences of capacity increase and speed reduction of the single battery. According to the method, the equipment for measuring and selecting the battery in the battery pack is simplified, and the manufacturing cost is reduced.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a method for selecting regenerated batteries in a battery pack. Background technique [0002] For high-power power sources, several battery cells are usually connected in series or in parallel to form a battery pack, and the performance degradation of any battery cell in the battery pack will cause serious damage to the performance of the entire battery pack, and even cause battery damage. Safety out of control and other issues. Therefore, it is necessary to monitor the battery cells in the battery pack in a timely manner, and select the batteries whose working conditions have declined in time. However, in the existing system, the detection device is relatively complicated and the cost is high. The invention provides a simple and accurate method for selecting batteries whose working state has declined. Contents of the invention [0003] A method for selecting regenerated ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/396G01R31/387
CPCG01R31/387G01R31/396
Inventor 盛蕾
Owner 泰州纳新新能源科技有限公司
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