Energy storage system and internal resistance detection method thereof

A technology of an energy storage system and a detection method, applied in the field of energy storage, can solve problems such as increasing system cost and integration complexity, and achieve the effects of reducing battery parasitic capacitance effects, improving detection accuracy, and high detection accuracy

Pending Publication Date: 2021-04-30
SINENG ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the embodiments of the present invention is to provide a method for detecting internal resistance of an energy storage system, which aims to solve the existing problems of increasing system cost and integration complexity due to the need for additional detection equipment

Method used

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  • Energy storage system and internal resistance detection method thereof
  • Energy storage system and internal resistance detection method thereof
  • Energy storage system and internal resistance detection method thereof

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Experimental program
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Embodiment 1

[0051] see figure 1 , is a schematic flow chart of the internal resistance detection method of the energy storage system provided by the first embodiment of the present invention. For the convenience of description, only the parts related to the embodiment of the present invention are shown. Energy storage system, specifically in this embodiment, refer to Figure 3 to Figure 5 As shown, the energy storage system includes: energy storage converter, battery management system, energy management unit and battery pack;

[0052] Wherein, the energy storage converter is respectively connected with the battery management system, the energy management unit and the battery pack, and is used to control the charge and discharge of the battery pack according to the control of the battery management system or the energy management unit;

[0053] The battery management system is respectively connected with the energy storage converter, the energy management unit, and the battery pack, and i...

Embodiment 2

[0071] see figure 2 , is a schematic flowchart of an internal resistance detection method of an energy storage system provided by the second embodiment of the present invention. For convenience of description, only the parts related to the embodiment of the present invention are shown. It is suitable for energy storage systems, and the corresponding parts can refer to the first embodiment above. Specifically, in this embodiment, the internal resistance detection method includes:

[0072] Step S11, the energy storage converter injects a corresponding specific current into the battery pack according to the detection instruction;

[0073] Wherein, in the embodiment of the present invention, the above-mentioned energy storage converter injects a corresponding specific current into the battery pack according to the detection instruction through the following steps:

[0074] (1) The energy management unit or the battery management system sends a detection command to the energy sto...

Embodiment 3

[0108] see Figure 3 to Figure 5 , is a block diagram of the energy storage system provided by the third embodiment of the present invention. For the convenience of description, only the parts related to the embodiment of the present invention are shown. The energy storage system is suitable for the internal resistance detection provided by the foregoing method embodiments. method, the energy storage system includes:

[0109] Energy storage converter (PCS, Power Conversion System), battery management system (BMS, Battery Management System), energy management unit (EMU, Energy Management Unit) and battery pack;

[0110] Wherein, the energy storage converter is respectively connected with the battery management system, the energy management unit and the battery pack, and is used to control the charge and discharge of the battery pack according to the control of the battery management system or the energy management unit;

[0111] The battery management system is respectively co...

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Abstract

The invention is applicable to the technical field of energy storage, and provides an energy storage system and an internal resistance detection method thereof. The energy storage system comprises an energy storage converter, a battery management system, an energy management unit and a battery pack, and the method comprises the steps that: the energy storage converter injects corresponding specific current into the battery pack according to a detection instruction; the battery management system synchronously detects voltage data and current data of the battery pack and each single battery in a specific current injection period; and the energy management unit or the battery management system correspondingly determines the internal resistance of the battery pack and the internal resistance of each single battery according to the voltage data and the current data of the battery pack and each single battery. The internal resistance detection method of the energy storage system provided by the invention solves the problems that the system cost and the integration complexity are increased due to the fact that detection equipment needs to be additionally added in the prior art.

Description

technical field [0001] The invention belongs to the technical field of energy storage, and in particular relates to an energy storage system and an internal resistance detection method thereof. Background technique [0002] Electrochemical energy storage is currently being used more and more widely. The performance of the battery is the key to the reliable operation of the energy storage system. If the battery fails or the capacity is insufficient, it may cause a major accident. Therefore, it is necessary to accurately predict the life and health of the battery. State detection, and internal resistance is an important indicator to measure the health status of the battery, so the accurate measurement of internal resistance becomes particularly urgent. [0003] In the current energy storage application system, the internal resistance detection methods include the following methods, pulse discharge method, constant current circuit detection method, AC injection method, etc., fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/389G01R31/396G01R31/392G01R31/385G01R31/36
CPCG01R31/389G01R31/396G01R31/392G01R31/385G01R31/3648
Inventor 姜正茂马双伟周立冬
Owner SINENG ELECTRIC CO LTD
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