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Equalizing circuit for lithium ion power accumulator

A power battery and balancing circuit technology, applied in battery circuit devices, circuit devices, current collectors, etc., can solve the problems of easy overcharge of batteries, deviation of SOC estimation of battery management system, easy overdischarge of batteries, etc., so as to reduce maintenance and replacement. , Improve the service life, improve the unbalanced effect

Inactive Publication Date: 2005-04-20
SHANGHAI FUEL CELL VEHICLE POWERTRAIN +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the process, cost and other reasons, there will inevitably be differences between the individual lithium-ion power batteries. Therefore, during the use of the battery, there will be differences in the voltage of each individual battery, which will cause the battery with a higher voltage to be easily overcharged. Charge
However, batteries with low voltage are easy to over-discharge, which affects the life of the battery, and this phenomenon will also lead to a large deviation in the SOC estimation of the battery management system, which affects the normal use of the battery.

Method used

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  • Equalizing circuit for lithium ion power accumulator

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Embodiment Construction

[0008] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0009] figure 1 Among them, lithium-ion power battery equalization circuit, each battery module has a set of equalization circuit, at least two unit battery modules are connected in series, the positive and negative terminals of the battery module V are respectively connected to the relay J, and the resettable fuse S is connected in series, through the switch K1, K2 Respectively connected to the discharge resistor R, constant current control DCDC converter. Since the lithium-ion power battery is in an open circuit condition, there is a certain relationship between the state of charge (SOC) of the single lithium-ion battery and its open circuit voltage (OCV), and the balance of the voltage of the single battery can achieve the state of charge of the battery. Purpose: Obtain the relationship curve of OCV corresponding to SOC at different temperatures fro...

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Abstract

This invention relates to a Li ionic power storage battery balance circuit. Every battery module has a set of balance circuit, at least two units of battery modules are serial, positive and negative ends of the battery module V are connected with a relay, serially connected with a self-restoring fuse and connected and a constant current DCDC converter with a discharge resistor switches separately. In the entire battery set by two conversions, the battery is charged or discharged according to the target balance voltage, balanced maximum volume difference or the maximum voltage difference designed by the module, the relay network switches the charge or discharge of the resistor of the constant current DCDC converter.

Description

technical field [0001] The invention relates to a battery balancing technology, in particular to a balancing circuit of a lithium-ion battery management system of a hybrid electric vehicle or a fuel cell vehicle. Background technique [0002] The battery management system (BMS) should ensure the safe and reliable operation of HEV (hybrid vehicle) or FCV (fuel cell vehicle), so that the battery has a relatively long life. Specifically include: overcharge protection, overdischarge protection, overheat protection, voltage balance of each single battery, etc. Due to the process, cost and other reasons, there will inevitably be differences between the individual lithium-ion power batteries. Therefore, during the use of the battery, there will be differences in the voltage of each individual battery, which will cause the battery with a higher voltage to be easily overcharged. Charge. However, batteries with low voltage are easy to over-discharge, which affe...

Claims

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Application Information

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IPC IPC(8): B60L11/18H02J7/00
CPCY02T10/70
Inventor 万钢魏学哲孙泽昌邹广楠
Owner SHANGHAI FUEL CELL VEHICLE POWERTRAIN
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