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Series battery pack charge-discharge protection method and system

A technology for connecting battery packs in series and protecting systems, which is applied in the fields of electronic technology and new energy, can solve the problems of reducing the capacity of the battery packs connected in series, and achieve the effects of small energy loss, high efficiency and avoiding failure.

Pending Publication Date: 2020-06-30
POWERCHINA CHENGDU ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is: the capacity of series-connected battery packs decreases due to the failure of single cells or a serious drop in capacity. Or the problem of maintaining the capacity balance of series battery packs when the capacity is seriously reduced

Method used

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  • Series battery pack charge-discharge protection method and system
  • Series battery pack charge-discharge protection method and system

Examples

Experimental program
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Embodiment

[0030] Such as figure 1 In the circuit structure diagram shown, battery 1 to battery n are n battery cells, and each cell can be a battery or a parallel connection of multiple identical batteries. SW1-SWn are electronic switches, and the electronic switches are controlled single-pole double-throw switches. One static contact of the switch is connected to the positive pole of the set of batteries, the other static contact of the switch is connected to the negative pole of the set of batteries, and the moving contact of the switch is connected to the negative pole of the previous set of batteries (for example, the battery corresponding to the switch is The positive pole of the battery pack is the first battery, then the moving contact of the switch is the positive pole output of the battery pack).

[0031]The battery pack is connected with a discharge DC-DC circuit or a charge DC-DC circuit, and is switched by a charge / discharge switch, and the switch is controlled by a control...

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PUM

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Abstract

The invention discloses a charging and discharging protection method for a series battery pack. The method comprises the following steps: S1, sampling the current of the series battery pack and the voltage of a single battery; S2, judging the capacity of each single battery of the series battery pack according to a sampling result in the step S1; S3, setting a battery capacity failure threshold; and S4, when the capacity of the single battery reaches a battery capacity failure threshold, permanently bypassing the single battery reaching the failure threshold. When a single battery in the series battery pack fails or the capacity is seriously attenuated, the damaged single battery can be effectively isolated, and the failure of the whole battery pack is avoided.

Description

technical field [0001] The invention relates to the fields of electronic technology and new energy, in particular to a charging and discharging protection method and system for a series battery pack. Background technique [0002] In recent years, with the rapid development of new energy and battery technology, secondary batteries have been widely used in fields ranging from portable electronic products to new energy vehicles, photovoltaic energy storage, etc. Commonly used secondary batteries include lead-acid batteries, nickel metal hydride Batteries, lithium batteries, etc. Due to the low voltage of the single battery (such as 2V for lead-acid battery and 3.7V for lithium battery), in actual use, in order to increase the output voltage, it is necessary to connect multiple battery cells in series to form a series battery pack. [0003] The capacity of a battery pack in series depends on the single cell with the lowest capacity in the battery pack. If the capacity of a sing...

Claims

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Application Information

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IPC IPC(8): H02J7/00H02H7/18H01M10/42H01M10/44
CPCH01M10/4207H01M10/425H01M10/441H01M2010/4271H02H7/18H02J7/0014H02J7/0016H02J7/0018Y02E60/10
Inventor 张超萍徐劲草
Owner POWERCHINA CHENGDU ENG