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Dynamic equalization circuit of battery management system and dynamic equalization method of dynamic equalization circuit

A battery management system and dynamic balancing technology, applied in battery circuit devices, electric vehicles, circuit devices, etc., can solve problems such as complex circuits, achieve simple circuits, reduce mis-balanced battery management, and improve accuracy and reliability.

Active Publication Date: 2015-09-30
SHENZHEN KELIE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method doubles the number of voltage sampling switches, that is, polarity selection switches, the circuit is too complicated, and further improvement is necessary

Method used

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  • Dynamic equalization circuit of battery management system and dynamic equalization method of dynamic equalization circuit
  • Dynamic equalization circuit of battery management system and dynamic equalization method of dynamic equalization circuit
  • Dynamic equalization circuit of battery management system and dynamic equalization method of dynamic equalization circuit

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Embodiment Construction

[0050] The present invention will be described below in combination with specific embodiments and with reference to the accompanying drawings.

[0051] a kind of like image 3 The dynamic equalization circuit of the battery management system shown in the figure includes sequentially cascaded bidirectional DC-DC converters and polarity commutators connected between the external power supply and the serially connected single batteries B1~B4, and used to control The battery selection switches K1~K5 of the corresponding single batteries are selected, and the sequentially cascaded battery selection switches K1~K5 connected between the sequentially connected single batteries B1~B4 and the first A / D port A / D1 of the CPU are used to control the selection. Through the voltage sampling switches S1-S5 of the corresponding single batteries, and the first A / D converter, one end of the odd-numbered battery selection switches K1, K3, and K5 is connected to the negative output end of the pola...

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Abstract

The invention discloses a dynamic equalization circuit of a battery management system and a dynamic equalization method of the dynamic equalization circuit. The circuit comprises a bidirectional DC / DC (direct current) convertor, a polarity reverser, battery selective switch groups, voltage sampling switch groups, a first A / D (analog / digital) convertor and a redundant voltage acquisition circuit, wherein the bidirectional DC / DC convertor, the polarity reverser and the battery selective switch groups are cascaded sequentially and connected between an external power supply and a single battery pack; the voltage sampling switch groups and the first A / D convertor are cascaded sequentially and connected between the single battery pack and a first A / D port of a CPU (central processing unit), and the redundant voltage acquisition circuit comprises a second A / D converter and an optoelectronic isolator which are cascaded sequentially and connected between the bidirectional DC / DC convertor and a second A / D port of the CPU; voltage of each single battery is detected by embedded control software, and two voltages acquired by the same single battery are subjected to redundancy judgment, and whether follow-up equalization of battery management is started is determined. The circuit is simple, the method is practical, the voltage detection accuracy of the single batteries can be remarkably improved, and mistaken equalization of battery management due to single voltage acquisition errors is greatly reduced.

Description

technical field [0001] The invention relates to battery management, in particular to a dynamic equalization circuit of a battery management system and a dynamic equalization method thereof. Background technique [0002] The battery pack composed of new batteries including lithium-ion batteries connected in series, due to the inconsistency of the battery cells, will lead to a decrease in the available capacity of the entire battery pack when used; charging a battery cell with a high voltage will cause the charging process to advance Termination, so that the charging capacity becomes smaller; when the battery cell with low voltage is discharged, it will cause the discharge process to terminate early, so that the discharge capacity is reduced. An equalizer or equalization circuit module is set in the battery management system (BMS for short) to balance the battery cells, discharge the cells with high voltage, and charge the cells with low voltage, so that The voltage, capacity...

Claims

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Application Information

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IPC IPC(8): H02J7/02H02J7/00H01M10/42
CPCY02E60/10
Inventor 张志国仝瑞军张泱渊胡运平
Owner SHENZHEN KELIE TECH
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