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A sampling current sharing circuit of a battery balancing manager

A battery balancing and manager technology, applied in battery circuit devices, arrangement of multiple synchronous batteries, current collectors, etc., can solve the problems of unbalanced cell voltage, increased battery voltage deviation, inconsistent sampling leakage current, etc. High circuit reliability, reduced impact, and the effect of avoiding unbalanced battery cell voltages

Active Publication Date: 2018-06-12
BEIJING INST OF SPACECRAFT SYST ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The resistance divider sampling circuit adopted by the equalization manager has the limitation that the sampling leakage current of each battery cell is inconsistent. voltage imbalance

Method used

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  • A sampling current sharing circuit of a battery balancing manager
  • A sampling current sharing circuit of a battery balancing manager
  • A sampling current sharing circuit of a battery balancing manager

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Embodiment Construction

[0023] The present invention will be further described in detail with reference to the accompanying drawings and embodiments.

[0024] The present invention proposes a sampling current sharing circuit of a battery balancing manager (such as figure 1 As shown), the sampling current sharing circuit of each battery cell includes a sampling circuit, a current sharing circuit and a conditioning circuit. The battery pack has n cells in total. figure 1 The sampling current sharing circuit of the medium battery pack includes the sampling current sharing circuits of the battery cell 1 to the battery cell n. Wherein, the low potential end of the battery pack is the low potential end Vcell- of the battery cell 1, and the high potential end of the battery pack is the highest potential end Vcell+ of the battery cell n. In the following, the battery cell n is taken as an example for description.

[0025] The sampling circuit includes sampling voltage dividing resistors Rn1 and Rn3 at the...

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Abstract

The invention provides a sampling and current-sharing circuit of a battery equalization manager. The circuit comprises n sampling and current-sharing units, wherein each sampling and current-sharing unit comprises a sampling circuit and a current-sharing circuit; each sampling circuit comprises a positive electrode sampling and voltage-dividing resistor of a single storage battery and a negative electrode sampling and voltage-dividing resistor of the single storage battery; the ith sampling and current-sharing unit is connected with the ith single battery; one end of the positive electrode sampling and voltage-dividing resistor of the ith single storage battery is connected with a positive electrode Vcelli+ of the ith single battery and the other end is connected with a negative electrode Vcell- of a battery pack; the positive electrode sampling and voltage-dividing resistor of the ith single storage battery comprises two series resistors Ri1 and Ri3; one end of the negative electrode sampling and voltage-dividing resistor of the ith single storage battery is connected with the negative electrode Vcelli- of the ith single battery and the other end is connected with the negative electrode Vcell- of the battery pack; the negative electrode sampling and voltage-dividing resistor of the ith single storage battery comprises two series resistors Ri2 and Ri4; the ith current-sharing circuit is a current-sharing resistor Ri0; and the current-sharing resistor Ri0 is connected between the positive electrode and the negative electrode of the ith single battery in parallel. The sampling and current-sharing circuit of the battery equalization manager has the advantages of being simple in circuit, high in sampling precision, small in leakage current difference, low in cost and the like.

Description

technical field [0001] The invention relates to a sampling current equalization circuit of a battery equalization manager, belonging to the technical field of power supply management. technical background [0002] The battery pack equalization circuit is used to ensure that the charging voltage of each single battery is balanced, so that the voltage deviation of each single battery is kept within the expected range, so as to ensure that each single battery is not damaged by overstress during the life of the spacecraft. If the balance charge control is not performed, the voltage difference of each single battery will gradually increase with the increase of charge and discharge cycles, resulting in a greatly shortened life span. [0003] At present, in the battery equalization management circuit, the sampling circuit of the battery cell voltage adopts the sampling circuit of the resistance divider, see the patent application "A Balanced Charge Manager for Lithium-ion Battery P...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J7/00
CPCH02J7/0021
Inventor 朱立颖乔明曾毅卢兴军陈世杰崔波李小飞
Owner BEIJING INST OF SPACECRAFT SYST ENG
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