A screening method for assembled batteries

A screening method and battery technology, applied in sorting and other directions, can solve problems such as consistency and inability to guarantee battery dynamic characteristics, and achieve the effect of improving accuracy, good consistency, and reducing pressure difference.

Active Publication Date: 2019-09-13
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, the matching group mainly considers multiple grouping parameters, which can effectively control the difference between the static parameters of the battery, but cannot guarantee the consistency of the dynamic characteristics of the battery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method for screening assembled batteries, comprising the steps of:

[0026] S1. Charge the battery with a predetermined constant current until the battery is fully charged, and record the charging termination voltage V 充 , and then discharge with a predetermined constant current until the battery is in an empty state, and record the end-of-discharge voltage V 放 , battery discharge capacity Q 1 , energy value E 1 , and measure the DC internal resistance R of the battery at 50% SOC 1 ;

[0027] S2. Charge the battery with a constant current to the end-of-charge voltage V 充 , measure its voltage V after standing for 0.5 hours 1 ;

[0028] S3. Vibrate the battery at a frequency of 10 Hz for 8 hours, then leave it at a temperature of 45°C for 5 days, and measure the voltage V of the battery 2 ;

[0029] S4. Discharge the battery at a predetermined constant current to the end-of-discharge voltage V 放 , record the discharge capacity value Q 2 , energy value E 2 , ...

Embodiment 2

[0034] A method for screening assembled batteries, comprising the steps of:

[0035] S1. Charge the battery with a predetermined constant current until the battery is fully charged, and record the charging termination voltage V 充 , and then discharge with a predetermined constant current until the battery is in an empty state, and record the end-of-discharge voltage V 放 , battery discharge capacity Q 1 , energy value E 1 , and measure the DC internal resistance R of the battery at 50% SOC 1 ;

[0036] S2. Charge the battery with a constant current to the end-of-charge voltage V 充 , measure its voltage V after standing for 3 hours 1 ;

[0037] S3. Vibrate the battery at a frequency of 55 Hz for 1 hour, then leave it at a temperature of 60°C for 1 day, and measure the voltage V of the battery 2 ;

[0038] S4. Discharge the battery at a predetermined constant current to the end-of-discharge voltage V 放 , record the discharge capacity value Q 2 , energy value E 2 , and ...

Embodiment 3

[0045] A method for screening assembled batteries, comprising the steps of:

[0046] S1. Charge the battery with a predetermined constant current until the battery is fully charged, and record the charging termination voltage V 充 , and then discharge with a predetermined constant current until the battery is in an empty state, and record the end-of-discharge voltage V放 , battery discharge capacity Q 1 , energy value E 1 , and measure the DC internal resistance R of the battery at 50% SOC 1 ;

[0047] S2. Charge the battery with a constant current to the end-of-charge voltage V 充 , measure its voltage V after standing for 2 hours 1 ;

[0048] S3. Vibrate the battery at a frequency of 20 Hz for 3 hours, then leave it at a temperature of 50°C for 2 days, and measure the voltage V of the battery 2 ;

[0049] S4. Discharge the battery at a predetermined constant current to the end-of-discharge voltage V 放 , record the discharge capacity value Q 2 , energy value E 2 , and ...

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PUM

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Abstract

The invention discloses a matching battery screening method. The matching battery screening method comprises the steps that batteries are charged to be in a fully-charged state, the charging final voltage V<charge> is recorded, then the batteries are discharged to be in a fully-discharged state, the discharging final voltage V<discharge>, the battery discharging capacities Q1 and the energy valuesE1 are recorded, and the direct current internal resistance values R1 of the batteries at the 50% SOC are measured; the batteries are charged to the charging final voltage V<charge>, and the voltagevalues V1 of the batteries are measured; the voltage values V2 of the batteries are measured; the batteries are discharged to the discharging final voltage V<discharge>, the discharging capacity values Q2 and the energy values E2 are recorded, and the direct current internal resistance values R2 of the batteries at the 50% SOC are measured; the batteries are charged to the charging final voltage V<charge> and then discharged to the discharging final voltage V<discharge>, and the discharging capacities Q3 is recorded; the abnormal batteries are screened; and the normal batteries are matched. The abnormal voltage difference, caused by the inconsistent dynamic characteristics, of the batteries can be reduced.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a method for screening assembled batteries. Background technique [0002] During the operation of an electric vehicle, it is necessary to connect the single batteries in series and parallel to form a battery pack to meet the power demand during the operation of the vehicle. Due to the large number of single cells in the battery pack, its unstable consistency will seriously affect the capacity, energy, pressure difference, cruising range, and service life of the battery pack, which in turn will affect the user experience during use. Due to the influence of various factors in the manufacturing process of the battery, there are certain differences in the single battery itself. This difference is usually manifested as the difference in characteristics such as capacity, internal resistance, self-discharge rate, voltage platform, charge-discharge curve, etc. That is, the inconsistency between...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B07C5/344
Inventor 杨思文厉运杰丁绍玉
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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