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Equalization circuit and method for controlling power battery packs

A power battery pack and equalization circuit technology, which is applied in battery/fuel cell control devices, electric vehicles, electric traction, etc., can solve the problems of battery pack energy waste and large consistency differences, and achieve the effect of rational utilization of energy

Pending Publication Date: 2018-04-06
SHENZHEN KELIE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above-mentioned technical problems of energy waste and large consistency difference of battery packs, the present invention proposes an equalization circuit and method for controlling power battery packs

Method used

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  • Equalization circuit and method for controlling power battery packs

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Embodiment Construction

[0017] The present invention will be further described below with reference to the accompanying drawings and in combination with preferred embodiments.

[0018] Such as figure 1 As shown, in this embodiment, each active equalizer adopts a bidirectional DCDC converter; the bidirectional DCDC converter adopts a magnetic isolation method to realize the isolation of the power battery pack and the low-voltage side; the bidirectional DCDC converter is on the power battery pack side and Multiple series-connected power battery packs are connected in series to realize active balancing of multiple strings of battery packs; the active balancing of all power battery packs is realized by multiple bidirectional DCDC converters to ensure that the active balancing function covers all power battery packs; each The bidirectional DCDC converters are independently controlled and do not depend on each other; the low voltage side of all bidirectional DCDC converters used in the entire power battery...

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Abstract

The invention discloses an equalization circuit for controlling power battery packs. The equalization circuit includes a plurality of active equalizers, a plurality of passive equalization circuits and a plurality of controllers. Each power battery pack comprises a plurality of series connection battery cells, the plurality of power battery packs are in series connection, and each passive equalization circuit is in one-to-one connection with the plurality of battery cells in the corresponding power battery pack and is used for equalizing voltages of the battery cells in the power battery pack.The plurality of active equalizers are in one-to-one correspondence connection with the plurality of power battery packs, and the plurality of controllers are in one-to-one correspondence connectionwith the plurality of active equalizers. The controllers are used to control the active equalizers to be adjusted to a low voltage side constant voltage control mode to achieve balanced discharge of the power battery packs and is used to control the active equalizers to a high voltage side constant current control mode to achieve balanced charge of the power battery packs, energy of the power battery packs is utilized reasonably, and consistency differences of the power battery packs are reduced.

Description

technical field [0001] The invention relates to an equalizing circuit and method for controlling a power battery pack. Background technique [0002] The power battery pack is an important part of the electric vehicle. Another important part of the power battery pack is the battery management system. The battery management system is responsible for the state monitoring of the battery pack, AC and DC charge and discharge management, balance management and protection, etc. Work. [0003] In high-series, high-capacity power lithium battery packs, balance management has been widely used. The topology of the existing active equalization circuit is complex, dozens or even hundreds of strings of batteries require a large number of components for the switch matrix, and the drive control is complicated and the cost is high. The existing passive equalization circuit mainly discharges and adjusts the high-energy energy of the battery cells through the discharge resistor. If the energy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60L11/18
CPCB60L58/12B60L58/20Y02T10/70
Inventor 张志国吕宝良胡运平张泱渊
Owner SHENZHEN KELIE TECH
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