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Attenuation coefficient-based method for evaluating dischargeable electric quantity of series battery pack

A technology of connecting battery packs and attenuation coefficients, applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc., can solve the problems of the lack of dischargeable power of the battery pack and the inability to compare and evaluate test standards, so as to reduce energy consumption and shorten the effect of time

Active Publication Date: 2014-04-02
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of lack of test standards and inability to compare and evaluate the dischargeable power of existing battery packs, thereby providing a method for evaluating the dischargeable power decay of series battery packs based on the attenuation coefficient

Method used

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  • Attenuation coefficient-based method for evaluating dischargeable electric quantity of series battery pack
  • Attenuation coefficient-based method for evaluating dischargeable electric quantity of series battery pack
  • Attenuation coefficient-based method for evaluating dischargeable electric quantity of series battery pack

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specific Embodiment approach 1

[0027] Specific implementation mode 1. Combination Figure 1-Figure 4 To illustrate this embodiment, the implementation process of a method for evaluating the attenuation of dischargeable power of a series battery pack based on the attenuation coefficient described in this embodiment is as follows:

[0028] Step 1: Select the battery cell that needs to be tested, and measure the capacity of the battery cell at room temperature; discharge the cell with a constant current of 1C to the lower limit cut-off voltage; Charge by constant current charging first and then constant voltage charging to reach full state;

[0029] Step 2: Use the same type and the same batch of battery cells in series to form a battery pack;

[0030] Step 3: Select a certain temperature point within the normal working temperature range specified in the battery manual as the temperature point to be tested, and the following steps are all carried out at this temperature point to be tested;

[0031] Step 4: U...

specific Embodiment approach 2

[0035] Specific Embodiment 2. In step 1 of this embodiment, the specific process of measuring the capacity of the battery cell is as follows: first, select the constant current 1C charging mentioned in the FreedomCar test standard to charge the battery with a constant current, and when it reaches the upper limit specified in the battery manual Keep the upper limit cut-off voltage unchanged at the cut-off voltage for constant voltage charging, stop charging when the current drops to 0.05C, and let it stand for 1 hour; then discharge with a constant current of 1C, stop discharging when it reaches the lower limit cut-off voltage, and discharge during the discharge process The power is the capacity of a single battery. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0036]Specific embodiment three. In step three of this embodiment, the temperature to be measured is -30°C, -20°C, -10°C, 0°C, 10°C, 20°C, 30°C, 40°C, 50°C or 60°C ℃. Other steps are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses an attenuation coefficient-based method for evaluating the dischargeable electric quantity of a series battery pack, relating to the field of prediction of the discharged electric quantity of the battery packs, and solving the problems that the dischargeable electric quantity of an existing battery pack lacks of test standard and cannot be compared and evaluated. The method comprises the steps: connecting individual batteries of the same type and the same batch in series to form a battery pack; charging and discharging the battery pack to be tested by adopting the same circulation mode; when the attenuation of the dischargeable electric quantity of the battery pack achieves x% of the individual rated capacity, stopping the circulation in the step IV, and recording the number of circulation times as N<battery pack circulation>; selecting the same model and the same batch of individuals in the battery pack and carrying out the same charging and discharging circulation in the step IV, recording the number of circulation times as N<individual circulation> when the dischargeable electric quantity of the battery pack achieves x% of the individual rated capacity, wherein the dischargeable electric quantity coefficient R of the series battery pack is equal to N<battery pack circulation> / N<individual circulation>*100%; and evaluating the dischargeable electric quantity degree of the series battery pack according to the R value. The attenuation coefficient-based method is applicable to the fields of series battery packs of electric vehicles, large-scale energy storage systems and the like.

Description

technical field [0001] The invention relates to an attenuation test of dischargeable power of a series battery pack based on an attenuation coefficient and an evaluation method based on the test, and relates to the technical field of battery pack discharge prediction technology. Background technique [0002] The battery pack composed of ideal single cells can discharge the same amount of electricity as the single cells without considering inconsistent factors such as internal resistance, temperature, open circuit voltage, coulombic efficiency, and capacity. After long-term cycle charging and discharging of lithium-ion battery packs in series, there will be an imbalance in the power of the cells in the battery pack, resulting in the attenuation of the actual discharge capacity of the battery pack. When the attenuation reaches a certain level, it will affect the performance of the battery pack. When it cannot meet the actual needs When the battery needs to be replaced, the cap...

Claims

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Application Information

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IPC IPC(8): G01R31/36
Inventor 朱春波孙金磊宋凯杨鹏
Owner HARBIN INST OF TECH
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