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Power battery pack equalizing circuit and method

A technology for power battery packs and equalizing circuits, which is applied to battery circuit devices, circuit devices, collectors, etc., can solve the problems of unsuitable multi-string battery packs and long time, and achieve small energy loss, no energy loss, and fast balanced effect

Active Publication Date: 2011-01-05
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method consumes very little energy, but when the distance between the single battery with low energy and the single battery with high energy is far away, the time required is also very long, and it is not suitable for multi-string battery packs

Method used

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  • Power battery pack equalizing circuit and method
  • Power battery pack equalizing circuit and method
  • Power battery pack equalizing circuit and method

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Embodiment Construction

[0020] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings, but the protection scope and implementation of the present invention are not limited thereto.

[0021] see figure 1 , figure 1 The overall structure diagram of the equalization circuit of the example of the present invention is given, wherein the power battery pack 1 is composed of n battery cells such as C1, C2..., Cn in series, n>1, double-pole normally open relays K1, K2 ... and Kn form a relay network 2, the relay network is composed of double-contact normally open relays with the same number as the number of battery cells, wherein 21 is the positive interface of the relay network 2, and 22 is the negative pole of the relay network 2 interface. The positive pole of the positive output terminal 7 of the bidirectional DC / DC converter 5 is connected to the positive pole interface 21 of the relay network, the negative pole is connected to th...

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Abstract

The invention discloses a power battery pack equalizing circuit and a power battery pack equalizing method, which are used for equalizing a power battery pack with at least two single batteries. The device comprises a battery pack, a sampling module, a control module, a dual-way DC / DC converter, an auxiliary power supply, and a relay network, wherein the power battery pack consists of at least two single batteries; the sampling module acquires the voltages of the single batteries; the dual-way DC / DC converter and the auxiliary power supply are used for charging and discharging the single batteries; and the relay network is connected with the battery pack and the dual-way DC / DC converter. In an equalizing process, the control module determines the single battery to be equalized according to the data of the sampling module and controls the closing and working modes of the dual-way DC / DC converter and the switching of the relay network, so that the battery to be equalized is charged or discharged. The power battery pack equalizing circuit and the power battery pack equalizing method can ensure that the voltage difference between the single batteries is no greater than a value set by the control module and improve the imbalance between the single batteries.

Description

technical field [0001] The invention relates to the technical field of battery management, in particular to a power battery group equalization circuit and an equalization method. Background technique [0002] Existing equalization technologies for battery packs can be roughly classified into energy-dissipative and energy-non-dissipative types. The energy dissipation type is to connect a shunt resistor in parallel with some single cells to consume the excess energy in the form of heat so that the overall voltage is balanced. On the one hand, this method leads to a waste of energy, and on the other hand, due to the limitation of equalization time, the shunt generates a lot of heat, especially in a large-capacity battery pack, which makes thermal management more difficult. The energy non-dissipative type generally uses energy storage elements such as inductors or capacitors to transfer the energy of a single battery with high energy to a battery with low energy. This method c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00
Inventor 康龙云朱洪波王静周凯
Owner SOUTH CHINA UNIV OF TECH
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