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Soh Estimation Method of Vehicle Ni-MH Battery Pack

A technology for nickel-metal hydride batteries and battery packs, applied in the measurement of electricity, measurement of electrical variables, instruments, etc., can solve the problems of inaccurate battery pack accuracy, failure to consider temperature, charge-discharge rate, depth of discharge, etc., to achieve a comprehensive state of health and Degree of deterioration, accurate health status and degree of deterioration, effect of accurate SOH estimation

Active Publication Date: 2020-12-18
先进储能材料国家工程研究中心有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the SOH estimation of the Ni-MH battery pack is very important. At present, the SOH estimation of the Ni-MH battery pack is mainly to directly count the charge and discharge capacity, without considering the influence of temperature, charge-discharge rate, and discharge depth, resulting in inaccurate estimation of the SOH of the battery pack.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A method for estimating the SOH of a vehicle-mounted nickel-metal hydride battery pack. The battery pack includes several battery modules connected in series, and the battery module includes several single cells connected in series. The steps are as follows:

[0023] Ⅰ Obtain the current I of the battery pack and the temperature T of each battery module in real time during the BMS power-on to power-off process 模块 , take the maximum value of each battery module temperature at each time as the battery pack temperature T at each time 电池包 , if the current I is a positive value, calculate the accumulative charging capacity C of the battery pack at each moment according to the formula (1) 累_充 , if the current I is a negative value, then calculate the cumulative discharge capacity C of the battery pack at each time according to the formula (2) 累_放 , calculate the battery pack discharge depth DOD at each moment according to formula (3), and use the difference between the maxim...

Embodiment 2

[0030] A method for estimating the SOH of a vehicle-mounted nickel-metal hydride battery pack. The battery pack includes several battery modules connected in parallel, and the battery module includes several single cells connected in series. The steps are basically the same, the difference is: the value of N in step II and step III is 50, and after step II is executed, the number of BMS power-on and power-off processes is reset to zero.

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PUM

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Abstract

The invention provides a state of health (SOH) estimation method of a vehicle-mounted nickel-metal hydride battery pack. When the number of times of the process from power-on to power-off of a batterymanagement system (BMS) reaches N, a mean value DOD<final_mean> of the final depth of discharge (DOD) of the battery pack in the N process from power-on to power-off of the BMS is calculated, according to the mean value DOD<final_mean> of the final DOD of the battery pack and the current accumulative charge-discharge capacity C<accumulation> of the battery pack, the SOH of the battery pack isobtained through estimation by checking a corresponding table of the DOD and the accumulative charge-discharge capacity and the SOH through a linear interpolation method, and then the SOH of the battery pack is estimated according to the same method every N times of the process from power-on to power-off of the BMS. According to the SOH estimation method, the technology is simple and practicable,the estimation precision of the SHO of the battery pack is high, and the SOH and deterioration degree of the battery pack can be known more comprehensively.

Description

technical field [0001] The invention relates to a method for estimating the SOH of a vehicle-mounted nickel-hydrogen battery pack. Background technique [0002] As a secondary battery, nickel-metal hydride batteries have the characteristics of long life, no pollution, high safety, high power and wide temperature range. The use of nickel-hydrogen batteries in new energy vehicles has become more and more mature, and can also meet the needs of Special fields such as high safety requirements and wide temperature range use, such as airplanes, rails, cruise ships, buses, etc. Therefore, the SOH estimation of the Ni-MH battery pack is very important. At present, the SOH estimation of the Ni-MH battery pack is mainly to directly count the charge and discharge capacity, without considering the influence of temperature, charge-discharge rate, and discharge depth, resulting in inaccurate estimation of the SOH of the battery pack. . Contents of the invention [0003] The invention a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/392
Inventor 钟发平向明匡德志徐国昌代剑马李谭姣
Owner 先进储能材料国家工程研究中心有限责任公司