Battery management system

A battery management system and battery pack technology, applied in battery circuit devices, current collectors, electric vehicles, etc., can solve problems such as inability to accurately reflect remaining battery power, unbalanced battery pack power, and reduced battery pack service life. Enhanced effect, low cost, high reliability effect

Active Publication Date: 2015-09-09
DONGGUAN POWERWISE TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As we all know, the battery voltage cannot accurately reflect the remaining battery power. For example, a battery with a high voltage is not necessarily the battery with the most power. If the battery is balanced according to the simple voltage judgment method, the power imbalance of the battery pack may be exacerbated, thereby reducing Lifespan of the battery pack

Method used

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Embodiment Construction

[0016] refer to figure 1 , figure 1 It is a structural schematic diagram of the connection between the battery management system and the battery pack of the present invention. The battery management system includes at least two power balancing devices 11 and a central control unit 12 . The central control unit 12 is connected to each power balance device 11 through a first bus 13 , and the power balance devices 11 are connected through a first inter-group power supply bus 14 and a second inter-group power supply bus 15 .

[0017] In this embodiment, the battery management system is used to balance the battery packs PACK1 , PACK2 , and PACKM (M≥3). Taking the battery pack PACKM as an example, the battery pack PACKM includes at least two battery cells BTN(1) and BTN(N), where N≥2. The battery pack PACKM is connected to the corresponding power balancing module 11 . The power balance device 11 is used to perform intra-group power balance on the battery cells BTN(N) in the corr...

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Abstract

The invention discloses a battery management system which is used for carrying out electric quantity equalization on at least two groups of battery packs. Each battery pack comprises at least two battery single bodies. The battery management system comprises a central control unit and electric quantity equalization devices corresponding to each battery pack. The central control unit is connected with each electric quantity equalization device through a first bus. The electric quantity equalization devices are mutually connected through a first inter-group power supply bus and a second inter-group power supply bus. The electric quantity equalization devices are used for carrying out within-group electric quantity equalization on the battery single bodies in the corresponding battery packs respectively and furthermore, carrying out inter-group electric quantity equalization on the different battery packs under the control of the central control unit. Through the method above, the battery management system can carry out within-group electric quantity equalization on the battery single bodies needing electric quantity equalization and meanwhile, carry out inter-group electric quantity equalization on the battery packs needing electric quantity equalization, and thus electric quantity equalization effect is effectively improved.

Description

technical field [0001] The invention relates to the field of battery management, in particular to a battery management system. Background technique [0002] According to the energy consumption in the equalization process, the existing battery equalization technology is mainly divided into two categories: energy dissipative type and energy non-dissipative type. Among them, the energy-dissipative power balance system tends to cause energy waste on the one hand, and on the other hand, it will bring about heat management problems. The structure of the energy non-dissipative power balance system is relatively complex, with many components, high cost, and low reliability. The equalization time required is also longer. Most of the existing battery balancing control methods are based on the judgment of the voltage of the single battery to control the energy transfer. As we all know, the battery voltage cannot accurately reflect the remaining battery capacity. For example, a batte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00
Inventor 林田生
Owner DONGGUAN POWERWISE TECH CO LTD
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