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Charge and discharge circuit for three-level battery pack

A charging and discharging circuit and battery pack technology, applied in battery circuit devices, charge balancing circuits, arrangement of multiple synchronous batteries, etc. Extend the discharge time and service life, and solve the effect of unbalanced charging

Pending Publication Date: 2019-12-20
厦门海泰新能技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If it is considered to set up a charging circuit for the positive electrode and the negative electrode to charge separately, it will not only lead to high hardware costs, but also increase the volume of the device, which is far from the direction of small and refined design.

Method used

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  • Charge and discharge circuit for three-level battery pack
  • Charge and discharge circuit for three-level battery pack

Examples

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Embodiment Construction

[0026] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are preferred embodiments of the present invention, and should not be regarded as excluding other embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

[0027] Unless otherwise clearly defined in the claims, specification and the above-mentioned drawings of the present invention, the terms "first", "second" or "third" are used for the purpose of grouping different objects, not Used to describe a specific order.

[0028] In the claims, description and the above-mentioned drawings of the present invention, unless otherwise clearly defined, the terms "center", "horizontal", "longitudinal", "ho...

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Abstract

The invention discloses a charge and discharge circuit for a three-level battery pack. A first shunting unit and a second shunting unit are arranged at two ends of a positive electrode group between apositive electrode and a neutral electrode of a lithium battery pack and a negative electrode group between the neutral electrode and a negative electrode in parallel separately; a BMS control unit monitors voltage of the positive electrode group and the negative electrode group; when the voltage of the positive electrode group is higher than that of the negative electrode group, a first switch is controlled to be closed and a second switch is controlled to be opened; and when the voltage of the positive electrode group is lower than that of the negative electrode group, the first switch is controlled to be opened and the second switch is controlled to be closed, thereby achieving balance of charging voltage at a positive end and a negative end of the lithium battery pack. According to the charge and discharge circuit disclosed by the invention, balanced charging of the three-level battery pack is achieved by adopting a single-level charger and matching with an inter-group equalization circuit, and the discharge time and the service life of the battery pack are effectively prolonged.

Description

Technical field [0001] The invention relates to the technical field of lithium batteries in the UPS industry, and more specifically, to a charging and discharging circuit for a three-level battery pack. Background technique [0002] The three-level battery pack with a neutral line is connected to the UPS bus. During discharge, the positive and negative electrodes of the battery pack are discharged unevenly due to the fluctuation of the load level at the UPS terminal. When charging, the positive and negative electrodes are charged together through the same charging circuit. . Over time, the discharge voltages at the positive and negative ends of the battery are inconsistent, resulting in poor discharge capacity of the battery pack. If one considers the use of separate charging circuits for the positive and negative electrodes, it will not only lead to excessive hardware costs, but also increase the volume of the device, which is far from the design direction of miniaturization. ...

Claims

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Application Information

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IPC IPC(8): H02J7/00H02J9/06G08C17/02
CPCH02J7/0016H02J7/0019H02J7/0036H02J7/0068H02J9/06G08C17/02
Inventor 陈炜明孟超
Owner 厦门海泰新能技术有限公司
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