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Method and system for performing safety prediction according to change of state variables of battery and external environment

A technology of battery status and external environment, applied in battery/fuel cell control devices, electric vehicles, electric traction, etc., can solve problems such as the inability to accurately predict the safety of battery packs, and the lack of mature methods for estimating the safety performance of battery packs. The effect of protecting safety, prolonging service life and ensuring personal safety

Active Publication Date: 2016-07-06
HUIZHOU BNET TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, at this stage, there is no mature method for estimating the safety performance of electric vehicle battery packs, and it is impossible to accurately predict the safety of battery packs.

Method used

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  • Method and system for performing safety prediction according to change of state variables of battery and external environment
  • Method and system for performing safety prediction according to change of state variables of battery and external environment
  • Method and system for performing safety prediction according to change of state variables of battery and external environment

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Embodiment 1

[0041] Embodiment 1 of the present invention provides a method for safety prediction based on changes in battery state and external environment, figure 1 It is a flow chart of the method of Embodiment 1 of the present invention, please refer to figure 1 , the method of the embodiment of the present invention includes the following steps:

[0042] Step S101. Memorize the battery state parameters at a preset frequency during the battery working process, such as 10MS to memorize the ampere-hour, total voltage, single voltage, current and temperature, namely: △AH10MS, △SUMV10MS, △VOLT10MS, △CUR10MS, △T10MS;

[0043] Step S102. Calculate the change amount of each battery state parameter within the preset time length and the time period corresponding to the preset frequency, such as the change amount of the memory ampere-hour data: △AH10MS(0), △AH10MS(1), △AH10MS( 2)...△AH10MS(n); and record the external environment values ​​of the battery pack synchronously: R0, R1...Rn;

[0044...

Embodiment 2

[0050] Embodiment 2 of the present invention provides a method for predicting safety according to changes in battery state and external environment, which is an improvement on the basis of Embodiment 1. figure 2 It is the method flowchart of the second embodiment of the present invention, please refer to figure 2 , the method of the embodiment of the present invention includes the following steps:

[0051] Step S201, memorizing battery state parameters at a preset frequency during battery operation, the battery state parameters include ampere hours, total voltage, single cell voltage, current and temperature;

[0052] The preset frequency adopts the frequency with the fastest sampling frequency among all battery state parameters;

[0053] Step S202. Calculate the variation of each battery state parameter within the preset time length and the time period corresponding to the preset frequency, and record the external environment value of the battery pack synchronously. The exte...

Embodiment 3

[0062] Embodiment 3 of the present invention provides a system for safety prediction based on changes in battery state and external environment, image 3 It is a structural block diagram of the third embodiment of the present invention, please refer to image 3 According to the embodiment of the present invention, the safety prediction system according to the change of the battery state quantity and the external environment includes a sequentially connected battery state parameter memory module 1, a battery state parameter change calculation module 2, a battery state parameter change difference calculation module 4, The safety real-time value determination module 5 and the response module 6; the safety real-time value determination module 5 is also connected with the external environment detection module 3 of the battery pack. The principle of each functional module will be described in detail below.

[0063] The battery state parameter memory module 1 is used to memorize bat...

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Abstract

The invention discloses a method and system for performing safety prediction according to the change of state variables of a battery and the external environment. The method comprises the steps of memorizing state parameters of the battery at a preset frequency; calculating the variation of each state parameter of the battery in the time period corresponding to the preset frequency within the preset time duration, and synchronously recording the external environment value; calculating the difference between every two adjacent variations; calculating the current security real-time value by combining the external environment value according to the difference between the adjacent variations of each state parameter of the battery; and comparing the current security real-time value with a grade alarm threshold and taking a response measure if the current security real-time value exceeds the grade alarm threshold. The system comprises a battery state parameter memory module, a battery state parameter variation calculation module, a battery pack external environment detection module, a battery state parameter variation difference calculation module, a security real-time value determination module and a response module. By applying the method and system, the safety performance of the battery pack in the current environment and the operating working condition can be predicted by combing the internal parameter variation of the battery pack and the external environment.

Description

technical field [0001] The present invention relates to the technical field of power batteries, and more specifically, relates to a method and system for predicting the safety of battery packs according to the change process of the battery state quantity and the external environment. Background technique [0002] For electric vehicles, the power battery is a very common energy storage component, and its performance plays a decisive role in the performance of the vehicle. In the power battery, lithium-ion batteries are used as an important energy storage medium, and have been widely used in the field of new energy. Wide range of applications. The safety of electric vehicle batteries is one of the most important indicators, which is related to personal and property safety. The battery pack safety performance estimation (SOL) is one of the important parameters of the battery state, which plays an important role in predicting the safety performance of the battery pack and preve...

Claims

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Application Information

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IPC IPC(8): B60L11/18
CPCB60L58/10Y02T10/70
Inventor 徐文赋任素云
Owner HUIZHOU BNET TECH CO LTD