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Charging method and charging device for lithium ion battery pack

A lithium-ion battery pack and charging method technology, which are applied to battery circuit devices, secondary battery charging/discharging, circuit devices, etc., can solve the problem of not being able to charge cells to full power, etc., and achieve a simple and easy charging method. Safe long-term use, balanced and reliable protection

Inactive Publication Date: 2011-09-14
SUZHOU PHYLION BATTERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, when charging with the above charging method, when the cells in the battery pack are inconsistent, after a certain cell reaches the overcharge protection voltage during the charging process, the protection circuit will cut off the charging circuit and stop charging. It is fully charged but the voltage of other cells is not fully charged, so it is impossible to charge each cell in the battery pack to a fully charged state

Method used

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  • Charging method and charging device for lithium ion battery pack
  • Charging method and charging device for lithium ion battery pack

Examples

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Effect test

Embodiment 1

[0028] A charging method for a lithium-ion battery pack. During the charging process, the voltage of each battery cell of the lithium-ion battery pack is detected, and when the voltage of a battery cell reaches a set voltage, the output current of the charger is controlled to balance the inside of the battery pack. The balanced current of the circuit is consistent until the voltage of all the cells reaches or exceeds the balanced starting voltage point to complete charging; the set voltage is equal to the balanced starting voltage.

[0029] That is, the normal charging method is used to charge first, and when the voltage of the battery cell reaches the balanced starting voltage point Vb, the charging current is controlled to be reduced; the charging current is reduced to the balanced current Ib, because the battery pack has started the balanced The charging current of the cell is balanced with the discharging current, so the cell actually does not absorb electric energy, so the...

Embodiment 2

[0031] A charging method for a lithium-ion battery pack, in which the equalization start signal of the equalization circuit of each battery cell of the lithium-ion battery pack is drawn to the microcontroller or current control circuit of the charger; When the circuit outputs the equalizing start signal, the output current of the charger is controlled to be less than or equal to the equalizing current of the equalizing circuit, until the equalizing circuits of all the cells output the equalizing starting signal to complete charging.

Embodiment 3

[0033] A charging method for a lithium ion battery pack, the output overcharge start signal of the overcharge protection circuit of each battery cell of the lithium ion battery pack is drawn to the microcontroller or current control circuit of the charger; during the charging process, when there is When the overcharge protection circuit of the battery cell outputs an overcharge start signal, the output current of the charger is controlled to be less than or equal to the balance current of the balance circuit until the voltage of all the cells reaches or exceeds the balance start voltage point to complete charging.

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Abstract

The invention discloses a charging method for a lithium ion battery pack. During charging, the voltage of each battery core in a lithium ion battery pack is detected; when the voltage of a battery core reaches a preset voltage value, the output current of the charger can be controlled to be less than or equal to the equalizing current of an equalizing circuit in the battery pack, and the charging process can be finished until the voltages of all battery cores reach or exceed an equalizing start voltage point; the preset voltage is greater than or equal to the equalizing start voltage and is less than an over-charge protection voltage. The charging method disclosed by the invention can charge each battery core in the battery pack to full charge state, thus realizing the full utilization of the capacity of the battery pack, realizing the maximal balance and reliable protection, and achieving positive practical significance.

Description

technical field [0001] The invention relates to a charging method and a charging device for a lithium-ion battery pack, which are suitable for charging a series-connected lithium-ion battery pack with no less than one cell. Background technique [0002] At present, lithium-ion battery packs have been widely used in various electronic products, even in electric vehicles, and are widely favored by people because of their advantages such as small size, light weight, and large electric energy capacity. [0003] Due to the limitations of the process conditions, there are certain differences between the single cells in the lithium-ion battery pack. After multiple charge and discharge cycles, or after a long time of storage, a large voltage difference will be generated between the cells. 1. The capacity is poor. Under the condition of the existing protection circuit, equalization circuit and charging mode, the voltage of each cell in the battery pack cannot be fully charged, so the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/44H02J7/00
CPCY02E60/12Y02E60/10
Inventor 李华林
Owner SUZHOU PHYLION BATTERY
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