Discharge control method of lithium ion battery pack

A lithium-ion battery, discharge control technology, applied in secondary battery charging/discharging, batteries, secondary batteries, etc., can solve the problems of shortened cycle life and capacity attenuation of lithium-ion batteries

Inactive Publication Date: 2016-11-02
EBULL POWER INNOVATIONS LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Causes the capacity decay of lithium-io

Method used

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  • Discharge control method of lithium ion battery pack
  • Discharge control method of lithium ion battery pack

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Embodiment Construction

[0018] The present invention will be described in further detail below in conjunction with specific examples. It should be understood that these embodiments are used to illustrate the basic principles, main features and advantages of the present invention, and the present invention is not limited by the scope of the following embodiments. The implementation conditions used in the examples can be further adjusted according to specific requirements, and the unspecified implementation conditions are usually the conditions in routine experiments.

[0019] The invention provides a voltage control method for improving the specific capacity of a lithium-ion battery pack. Several batteries are connected in parallel, and the measured single-cell voltage is approximately the voltage of a single battery. Due to the imbalance of the battery, the minimum value of all single-cell voltages is taken. , as a benchmark for terminating the discharge. According to the minimum value of the single...

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Abstract

This application provides a discharge control method of a lithium ion battery pack, which includes the steps of: sampling and detecting single-cell voltage of the battery pack to calculate minimum value of the single-cell voltage; when the minimum value of the single-cell voltage reaches preset discharge terminal voltage of the single cell, controlling a load to switch a discharge circuit off to stop discharging. Compared with a method in which the discharge terminal voltage of the battery pack is set manually in the prior art, the voltage management method can prolong the discharge time of the battery as more as possible, can increase the effective capacity of the battery, and prevents capacity attenuation of the lithium ion battery due to over-discharge of the single cell and prevents reduction of cycle life.

Description

technical field [0001] The invention relates to a discharge control method of a lithium ion battery pack. Background technique [0002] New energy electric vehicles have voltage and capacity requirements for the battery pack as a power source. The battery pack is often composed of thousands of single cells connected in series and parallel. Several single cells are connected in parallel to form several nodes, and the voltage of two adjacent nodes is approximately equal to the voltage of the single cells. Hereinafter referred to as single-cell voltage. In order to ensure the safety of the lithium-ion battery pack, the battery pack composed of lithium-ion single cells has a power management system (BMS), which balances the voltage of the single cells and controls the key parameters of the battery, such as the voltage and current of the battery pack. The internal temperature is monitored. When charging, the total voltage of the battery pack exceeds the artificially set end-of...

Claims

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Application Information

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IPC IPC(8): H01M10/44
CPCH01M10/441H01M10/448H01M2220/20Y02E60/10
Inventor 袁光辉
Owner EBULL POWER INNOVATIONS LTD
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