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Parallel type battery system modeling method based on SOC compensator

A battery system and modeling method technology, applied in the direction of instruments, measuring electricity, measuring electrical variables, etc., can solve problems such as inconsistent performance parameters of battery cells

Active Publication Date: 2015-12-02
YCIT TECH TRANSFER CENT CO LTD
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Problems solved by technology

[0004] The problem to be solved by the present invention is to provide a parallel battery system modeling method based on SOC compensator to solve the problem that the battery performance parameters (such as voltage, current, etc.) And the problem that the charging and discharging characteristics are difficult to be accurately measured and estimated, to achieve the purpose of accurately predicting the charging and discharging characteristics of the parallel battery system

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  • Parallel type battery system modeling method based on SOC compensator
  • Parallel type battery system modeling method based on SOC compensator
  • Parallel type battery system modeling method based on SOC compensator

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Embodiment Construction

[0020] The present invention will be further described in detail below in conjunction with specific examples, which are for explanation of the present invention rather than limitation.

[0021] 1. Parallel battery system and battery cell model

[0022] 1.1 Parallel battery system

[0023] The parallel battery system is composed of N battery modules connected in parallel, and each battery module is composed of multiple battery cells connected in series. Its structure diagram is as follows: figure 1 shown. For the convenience of analysis, in this example, it is assumed that the parallel battery system is composed of two battery modules connected in parallel, and each battery module is composed of only one battery cell, that is, the parallel battery system is composed of two battery cells connected in parallel, such as figure 2 shown. The rated voltage of each battery cell is 3.7V, the rated capacity is 860mAh, and the discharge cut-off voltage is 3V.

[0024] 1.2 Equivalent...

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Abstract

The invention discloses a parallel type battery system modeling method based on an SOC compensator, and N battery single bodies are connected in parallel to form a parallel type battery system. The method comprise the following steps: establishing a battery system mean value model according to known lithium ion battery single body performance parameters by utilizing parallel circuit working characteristics and current characteristics of various branch battery single bodies, designing one SOC compensator by utilizing comparison between actual values of the various branch battery currents and a mean value model branch current then, determining a mathematical relationship between the various battery single body performance parameters and a battery system performance parameter then, and establishing a parallel type battery system model. The parallel type battery system model established in the invention can effectively simulate charge and discharge operating characteristics of the parallel type battery system, the modeling method of the invention can be suitable for parallel connection of the battery single bodies and also be suitable for parallel connection of battery modules.

Description

technical field [0001] The invention belongs to the technical field of design and control of a MW-level battery energy storage system in a smart grid, and relates to a modeling method for a parallel battery system based on an SOC compensator. Background technique [0002] Due to the advantages of high specific energy, no memory effect, long cycle life, and low self-discharge, battery systems based on lithium-ion batteries have been widely used in electric power, energy, military and other fields. At the same time, due to the constraints of the rated capacity and voltage of the battery cells themselves, it is usually necessary to connect multiple battery cells in parallel to form a battery system with a larger capacity, that is, a parallel battery system. For the parallel battery system, because of the inconsistency of the internal battery cells, the charging and discharging current of each branch will not be the same during charging and discharging; at the same time, the bat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
Inventor 彭思敏朱学来姚志垒何坚强张兰红阚加荣
Owner YCIT TECH TRANSFER CENT CO LTD
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