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Measurement method for estimating actual available capacity by SOC (state of charge) of power battery set

A technology of power battery pack and measurement method, which is applied in the direction of measuring electricity, measuring device, measuring electrical variables, etc., can solve the problem of large consistency difference, and achieve the effect of wide temperature application range.

Inactive Publication Date: 2013-01-02
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problem that the battery packs in electric vehicles and hybrid vehicles have larger consistency differences during use, and provide a method for measuring the SOC of power battery packs to estimate the actual available capacity

Method used

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  • Measurement method for estimating actual available capacity by SOC (state of charge) of power battery set
  • Measurement method for estimating actual available capacity by SOC (state of charge) of power battery set
  • Measurement method for estimating actual available capacity by SOC (state of charge) of power battery set

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specific Embodiment approach 1

[0039] Specific implementation mode one: the following combination figure 1 Describe this embodiment, a method for measuring the SOC of a power battery pack to estimate the actual available capacity described in this embodiment, the implementation steps of this method are:

[0040] Step 1: Set the operating temperature of the power battery pack to N;

[0041] Step 2: Charge the power battery pack to be tested with a constant current. When the voltage of any battery in the power battery pack to be tested reaches the charging upper limit cut-off voltage, stop charging, and record the voltage of the entire power battery pack to be tested at this time, as The charging upper limit cut-off voltage of the power battery pack to be tested;

[0042] Step 3: Discharge the power battery pack to be tested after charging in step 2 with a constant current. When the voltage of any battery in the power battery pack to be tested reaches the discharge lower limit cut-off voltage, stop dischargi...

specific Embodiment approach 2

[0050] Specific implementation mode two: the following combination figure 1 This embodiment will be described. This embodiment is a further description of N in Embodiment 1. The range of N value in this embodiment is -20°C-60°C.

specific Embodiment approach 3

[0051] Specific implementation mode three: the following combination figure 1 This embodiment will be described. This embodiment is to further describe ε in Embodiment 1, and the value of ε described in this embodiment is 2.

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Abstract

The invention discloses a measurement method for estimating actual available capacity by an SOC (state of charge) of a power battery set, belonging to the technical field of management of a power battery or the power battery set. The measurement method aims at solving a problem of high uniformity difference of the battery sets in an electric vehicle and a hybrid vehicle when in use, and to provide the measurement method for estimating the actual available capacity by the SOC of the power battery set. The actual available capacity of the power battery set is determined by monitoring voltages of batteries in the power battery set in charging and discharging processes according to situations that a highest voltage reaches an upper limit cut-off voltage in the charging process and a lowest voltage reaches a lower limit cut-off voltage in the discharging process, and actual charging and discharging cut-off voltages of the power battery set can be determined. A test proves that the actual available capacity of the batteries is determined by the measurement method and the batteries in the power battery set are good in voltage uniformity. The measurement method is suitable for measuring the actual available capacity of the power set in the electric vehicle and the hybrid vehicle.

Description

technical field [0001] The invention relates to a method for measuring the actual available capacity used for estimating the SOC of a power battery pack, and belongs to the technical field of power battery or power battery pack management. Background technique [0002] At present, people pay more and more attention to the protection of the environment and the effective and rational use of energy. Therefore, high-efficiency, energy-saving, and environmentally friendly new energy vehicles have become the development trend of the automotive industry. In order to ensure the safety of the power battery and the implementation of the vehicle control strategy, the research and development of the power battery management system is particularly important. Among them, SOC (percentage of remaining power), as the most important factor affecting battery characteristics, is one of the hotspots and difficulties in the research of battery pack management systems in recent years. [0003] T...

Claims

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Application Information

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IPC IPC(8): G01R31/36
Inventor 朱春波冯飞逯仁贵
Owner HARBIN INST OF TECH
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