Lithium battery protection circuit and protection method thereof

A technology for protecting circuits and lithium batteries, applied in battery circuit devices, emergency protection circuit devices, circuit devices, etc., can solve the problem that the voltage of the battery pack cannot reach the set value of the charger, so as to improve charging efficiency and ensure safety. Effect

Inactive Publication Date: 2010-08-04
HUIZHOU EPOWER ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this charging management is that it only feeds back the port voltage of the battery pack. When the consistency of the cells in the battery pack is good, this charging method can achieve the expected effect; , the

Method used

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  • Lithium battery protection circuit and protection method thereof
  • Lithium battery protection circuit and protection method thereof
  • Lithium battery protection circuit and protection method thereof

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Embodiment Construction

[0024] In order to facilitate the understanding of those skilled in the art, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0025] figure 1 It is a schematic diagram of the protection circuit principle. As shown in the figure, the lithium battery charging management circuit includes a front-end acquisition unit 11 for collecting the voltage and temperature parameters of each cell of the battery, and performs system control and charging management according to the collected voltage and temperature parameters of each cell of the battery. The MCU main control unit 10 is controlled by the MCU main control unit and receives the PWM signal to control the charging control unit 12 of the external charger. The front-end acquisition unit 11 adopts a powerful integrated chip OZ890, which is connected to the MCU through a serial port and performs data transmission with it. The charging control unit 12 adop...

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Abstract

The invention discloses a lithium battery protection circuit and a protection method thereof. The protection circuit is arranged in the lithium battery pack and is connected with the two poles of the cell of each battery forming the lithium battery pack, and comprises a front end acquire unit, an MCU master unit and a charging and control unit. The protection method comprises that the front end acquiring unit acquires parameters of the voltage of the cells of the batteries in real time and transmits the parameters to the MCU; according to the given charging current and the read data, the MCU calculates and outputs a control signal of PWM to control a charger for charging; the MCU reduces the charging current for charging or stops the charge in due time so as to necessarily protect the batteries. The protection circuit and the protection method adopt a feedback mode of simple link cell voltage, thereby effectively avoiding the defects of charging management when only the voltage of two poles Pack+ and Pack- of the lithium battery is taken as the reference; and when the voltage of the cell of a certain link reaches the amplitude limiting value, the MCN regulates the command to reduce the charging current and prevents the voltage of the battery from overrunning, thereby ensuring the safety of the lithium battery and improving the charging efficiency at the same time.

Description

technical field [0001] The invention relates to the technical field of lithium battery protection, in particular to a protection circuit and a protection method for a lithium battery applied to an electric bicycle. Background technique [0002] At present, conventional lithium battery packs for electric bicycles only have lithium battery protection functions, and a few lithium battery packs support simple equalization functions. Usually, such protection systems are called lithium battery protection boards, and the charging management of the batteries is completed by an external charger. , The connection between the charger and the battery pack is relatively simple, that is, through the Pack+ and Pack- terminals. The charging process is generally constant current first and then constant voltage. When the current during the constant voltage process drops to about 0.01C, the charging is considered complete. For battery packs with too low voltage, trickle pre-charging is genera...

Claims

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Application Information

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IPC IPC(8): H02J7/00H02H7/18
CPCY02E70/40Y02E60/10
Inventor 冯大明刘飞阮旭松张维戈王占国邓杰
Owner HUIZHOU EPOWER ELECTRONICS
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