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Temperature compensation based charging control and protection method for nickel-hydrogen battery pack

A nickel-metal hydride battery, temperature compensation technology, applied in battery circuit device, safety/protection battery circuit, arrangement of multiple synchronous batteries, etc. Guarantee normal use, simple and feasible effect

Active Publication Date: 2018-11-13
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

However, for some special applications, such as airplanes, rails, etc., the ambient temperature range is wide. If the battery pack is used with a fixed charging cut-off threshold, based on the characteristics of Ni-MH batteries, the battery will not be fully charged in low-temperature environments, and the battery will be easily charged in high-temperature environments. overcharge

Method used

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  • Temperature compensation based charging control and protection method for nickel-hydrogen battery pack
  • Temperature compensation based charging control and protection method for nickel-hydrogen battery pack
  • Temperature compensation based charging control and protection method for nickel-hydrogen battery pack

Examples

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Embodiment 1

[0026] A charging control and protection method for Ni-MH battery pack based on temperature compensation, the process control diagram is as follows figure 1 As shown, the battery pack includes a number of battery modules connected in series, and the battery module includes a number of single batteries connected in series. The steps are as follows:

[0027] S1: Obtain the temperature of several current battery modules in real time and determine the maximum temperature Tmax of the current battery module, and calculate the total voltage overvoltage threshold U of the battery pack at the maximum temperature Tmax 0 and battery module voltage threshold U 1 , then execute step S2;

[0028] The battery module voltage threshold U at the highest temperature Tmax of the battery module 1 is N×Ucell, where N is the number of single cells in the battery module, and Ucell is the voltage threshold of a single cell fully charged at the highest temperature Tmax of the battery module, and Ucel...

Embodiment 2

[0039] A temperature compensation-based charging control and protection method for Ni-MH battery packs, the steps of which are basically the same as those of the temperature-compensated Ni-MH battery pack charging control and protection method in Embodiment 1, except that in step S2, The current battery pack charge maintains SOC at a rate of 3% / second and is revised to SOC 1 ; In step S4, the battery module maximum temperature threshold T 0 The value is 60°C; in step S5, the battery pack is charged with the highest charge retention threshold SOC 0 The value is 95%.

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Abstract

The invention provides a temperature compensation based charging control and protection method for a nickel-hydrogen battery pack. The method comprises the following steps: firstly, acquiring the temperature of a plurality of current battery modules in real time and determining the maximum temperature Tmax of the current battery modules, calculating a battery pack total overvoltage threshold U0 and a battery module voltage threshold U1 under Tmax, then acquiring a current battery module voltage of each battery module in real time and calculating the maximum value Umol of the current battery module voltage, calculating current battery pack charge retention SOC (state of charge), sequentially comparing Umol with U1, current battery pack total voltage U with U0, Tmax with the battery module maximum temperature threshold T0 and SOC with the battery pack maximum charge retention threshold SOC0, conducting corresponding steps according to comparison results until a relay controlling a battery pack charging loop is turned off, and finishing charging to the battery pack. The method is simple and feasible, can ensure that the battery pack cannot be overcharged when used at high temperatureand can be fully charged when used at low temperature, and ensures that the battery pack can be used normally.

Description

technical field [0001] The invention relates to the technical field of nickel-metal hydride batteries, in particular to a temperature compensation-based charge control and protection method for nickel-hydrogen battery packs. Background technique [0002] As a secondary battery, nickel-metal hydride batteries have the characteristics of long life, no pollution, high safety and wide temperature use, and can meet special fields such as high safety requirements and wide temperature use, such as airplanes, rails, cruise ships, buses, etc. . A battery module is formed by connecting a plurality of nickel-metal hydride single batteries in series, and then a battery pack can be formed by connecting a plurality of battery modules in series according to needs, and the battery pack is used in a corresponding use place. However, due to the large number of single cells in the battery pack, corresponding control and protection will be performed when charging in high-temperature and low-te...

Claims

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Application Information

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IPC IPC(8): H02J7/00
CPCH02J7/0026H02J7/0091
Inventor 谭姣张旭辉徐国昌彭波孟文韬
Owner 先进储能材料国家工程研究中心有限责任公司
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