Distributed type battery pack balance control system and control method thereof
A technology of balanced control and control method, applied in battery/fuel cell control devices, electric vehicles, power management, etc. loss, the effect of reducing complexity
Active Publication Date: 2019-06-11
XI AN JIAOTONG UNIV
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Problems solved by technology
However, the traditional balance control of battery packs adopts the complex balance control form of intra-group balance and inter-group balance. The power loss caused by the delay transfer path reduces the battery energy utilization rate of the battery pack
In order to eliminate the disadvantages of power loss in the traditional balance control and reduce the complexity of the traditional balance control system, it is necessary to design a new battery pack structure and design a simple and feasible balance control scheme
Method used
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[0046] In order to make the purpose and technical solution of the present invention clearer, the battery pack balance control of the present invention will be described in detail below in conjunction with the accompanying drawings:
[0047] Such as figure 1As shown, a distributed battery pack balance control system of the present invention includes N single battery power modules, N fault switches and a central controller, and the output terminals of the battery power modules are connected in series; wherein each battery power module, Adopting the concept of modular battery power supply, it consists of a single lithium battery, a DC-DC converter and a microprocessor. Each DC-DC converter is composed of 2 thyristor switches, 1 inductor and 1 inductor.
[0048] Specifically, a single lithium battery is used as a power battery unit, connected to a fault switch, a DC-DC converter and a microprocessor to form a battery power module, each DC-DC converter consists of 2 MOSFET switche...
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The invention discloses a distributed type battery pack balance control system and a control method thereof. A distributed type energy storage battery pack structure which is in series connected to asingle battery power supply module is adopted, so that balance control on in-pack balance and inter-pack balance in a conventional battery pack is converted into unified balance control on the singlebattery power supply module by performing unified control on the single battery power supply module, and therefore, complexity of a battery pack balance system is reduced; based on a power distribution concept, a weight factor of battery pack balance is designed according to end voltage, capacity and SOC parameter of the single lithium battery; a charging / discharging rate of the single lithium battery is regulated, so that battery pack balance is realized, and power loss caused by an energy transmission process of a single battery in conventional battery pack in-pack balance is eliminated, andtherefore, a battery energy utilization rate in the battery pack is improved.
Description
technical field [0001] The invention belongs to the field of battery energy storage, and in particular relates to a distributed battery pack equalization control system and a control method thereof. Background technique [0002] As the dual crises of environment and energy continue to deepen, energy conservation and environmental protection have become important issues in the development of human society, and traditional fuel vehicles will gradually be replaced by new energy vehicles represented by pure electric vehicles. Due to the characteristics of high operating voltage, high specific energy and high cycle life, lithium batteries are usually used as the main power source for new energy vehicles, mainly pure electric vehicles. [0003] At present, in order to meet the high voltage and high power requirements of electric vehicles, electric vehicles usually use a large number of single lithium batteries in various forms of series and parallel to form battery packs for power...
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Login to View More IPC IPC(8): B60L58/22
CPCY02T10/70Y02T10/72
Inventor 续丹毛景禄郑惠文周佳辉
Owner XI AN JIAOTONG UNIV