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Series Battery Pack Monitoring Diagnostics, Equalization Circuits and Strategies

A battery pack and battery equalization technology, which is applied in the direction of charge equalization circuit, battery circuit device, circuit device, etc., can solve the problems affecting battery life, etc., and achieve the effect of improving the correct diagnosis rate, improving the pit interference ability, and improving the test accuracy

Active Publication Date: 2022-07-12
ZHEJIANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Performing square wave chopping on the battery is essentially intensive and intermittent charging and discharging of the battery. Long-term square wave chopping on the battery to achieve balance will affect the life of the battery

Method used

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  • Series Battery Pack Monitoring Diagnostics, Equalization Circuits and Strategies
  • Series Battery Pack Monitoring Diagnostics, Equalization Circuits and Strategies
  • Series Battery Pack Monitoring Diagnostics, Equalization Circuits and Strategies

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Embodiment Construction

[0066] The present invention is described in detail below with reference to the accompanying drawings. A monitoring, diagnosing, and balancing circuit for a series battery pack includes the following technical solutions:

[0067] like figure 1 As shown, the monitoring, diagnosis, and equalization circuit of the series battery pack includes a charger 1, a voltage source 2, a voltage-controlled constant current source 3, a voltage measurement module 4, a temperature measurement module 5, and a load resistance R. L , Switches K01, K02, K03, K04, K11~K1N and K21~K2N, N is the number of battery cells.

[0068] Both ends of the battery packs B1 to BN in series to be tested are connected in parallel with the charger 1 . The negative poles of each battery in the series-connected battery packs B1 to BN are respectively connected to one end corresponding to the switches K21 to K2N, and the other ends of the switches K21 to K2N are all grounded. The positive poles of each battery in th...

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Abstract

The invention discloses a monitoring, diagnosing, equalizing circuit and a strategy for a series battery pack. The battery pack monitoring, diagnosis and balance circuit includes charger, voltage source, voltage-controlled constant current source, voltage measurement module, temperature measurement module, load resistance, switches K01, K02, K03, K04, K11~K1N and K21~K2N. In the battery pack balancing strategy, a voltage-controlled constant current source is used to achieve continuous charging and discharging. Using the two variables of the terminal voltage and voltage deviation of each single cell as the input, the fuzzy logic algorithm is used to estimate the battery balancing voltage adjustment and the corresponding voltage. The control voltage of the constant current source voltage control module is used to adjust the charge and discharge current when the battery is balanced. In the monitoring and diagnosis of the battery pack, the relative change of internal resistance obtained by pulse discharge and the relative change of charge during the equalization process are used as input, and the battery state is estimated by fuzzy logic algorithm.

Description

technical field [0001] The invention relates to the field of battery detection and battery management systems, in particular to a monitoring, diagnosing, equalizing circuit and a strategy for a series battery pack. Background technique [0002] As a backup power supply, the series lead-acid battery pack has always been a standard solution for emergency and backup power supplies such as communication base stations and power stations. When the lead-acid battery pack is charged, it is affected by the internal resistance of the battery pack, differential voltage, self-discharge and other factors, and it is impossible to ensure that each battery cell is equally divided into the charging voltage, resulting in differences in the voltage of the battery cells, resulting in unbalanced , affecting the use effect and lifespan. The terminal voltage of the battery in the floating state for a long time always shows a normal state. Even if there is a problem, it is impossible to judge whet...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J7/00G01R31/367G01R31/382
CPCH02J7/0014H02J7/0016G01R31/367G01R31/382Y02E60/10
Inventor 陈希李映雪刘洋陈赵江蔡建程丁宇
Owner ZHEJIANG NORMAL UNIVERSITY
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