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Intelligent charging system and charging method of power car lithium battery pack

A technology of intelligent charging and lithium battery packs, applied in battery circuit devices, electric vehicles, collectors, etc., can solve D/A conversion output conversion errors, cannot effectively track lithium battery charging curves, and cannot simulate lithium battery constant voltage charging stage and other issues to achieve the effect of improving control accuracy and reducing costs

Inactive Publication Date: 2010-08-04
CHERY AUTOMOBILE CO LTD
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0003] The above-mentioned charging device only controls the charging current, cannot simulate the constant voltage charging stage of lithium battery charging, cannot effectively track the charging curve of lithium battery, and there is a certain conversion error in the D / A conversion output

Method used

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  • Intelligent charging system and charging method of power car lithium battery pack
  • Intelligent charging system and charging method of power car lithium battery pack
  • Intelligent charging system and charging method of power car lithium battery pack

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Embodiment Construction

[0022] In the following, a battery pack with a nominal capacity of 40Ah, a nominal voltage of 345.6V, and a maximum charging voltage of 394.2V is taken as an example to describe the present invention in detail with reference to the accompanying drawings.

[0023] Such as figure 1 As shown, this system is mainly composed of a power filter module, a PFC power factor correction module, a DC-DC drive module, a DC-DC module, an output protection circuit, an auxiliary power supply circuit and a single-chip control unit. The PFC power factor correction module includes IR1150 module and LM339 module. IR1150 provides over-current protection. When an over-current fault occurs, the PFC and DC-DC modules are turned off. LM339 provides over-voltage, under-voltage, and over-temperature detection. When LM339 detects When the system is over-voltage, under-voltage, or over-temperature, the relevant signals are sent to the single-chip control unit, and the single-chip action closes the PFC and stop...

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Abstract

The invention discloses an intelligent charging system and charging method of a power car lithium battery pack. The system comprises a power-supply filter module, a PFC power factor correction module and a DC-DC module. The system is characterized in that the system also comprises a DC-DC driving module and a SCM control unit, wherein the SCM control unit is used to output two-channel PWM waveform, and the two-channel PWM waveform is amplified by the DC-DC driving module to control the on / off of an MOS tube in the DC-DC module, thus the DC-DC module is controlled to output voltage and current and the optimal charging curve is tracked. By using the intelligent charging method of the invention, the lithium battery pack with a certain capacity and voltage range can be automatically charged, and the automatic charging maintenance can be performed. The method uses the SCM to output PWM wave and control the DC-DC circuit, thus controlling the charging voltage and current without using the DC-DC control circuit and DA switching circuit, reducing the cost of charger and increasing the control precision.

Description

Technical field [0001] The invention belongs to the field of electric vehicles, and relates to a charger, in particular to a power lithium battery charger for vehicles. Background technique [0002] At present, among the known technologies, technical materials similar to the present invention include: high-power smart charger and its charging method (CN1333589A). The device includes a controllable rectifier circuit, a control unit, a monitoring circuit, a D / A conversion circuit, an A / D conversion circuit and a trigger circuit. The normal voltage AC power is input to the power grid and then enters the controllable rectifier circuit for rectification, and then is input to the battery pack to be charged. The monitoring circuit detects that the charging data is converted into a digital signal by the A / D conversion circuit and input to the control unit. The data is processed by the control unit After entering the D / A control circuit, it is converted into an analog signal and input to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/04H02H7/18
Inventor 龚立秋朱得亚王建辉
Owner CHERY AUTOMOBILE CO LTD
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